2G Power Control

GSM BSS

Power Control Feature Parameter Description Copyright © Huawei Technologies Co., Ltd. 2011. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

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Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

GSM BSS Power Control

Contents

Contents 1 Introduction ................................................................................................................................1-1 1.1 Scope ............................................................................................................................................ 1-1 1.2 Intended Audience......................................................................................................................... 1-1 1.3 Change History.............................................................................................................................. 1-1

2 Overview......................................................................................................................................2-1 3 Technical Description ..............................................................................................................3-2 3.1 Principles ....................................................................................................................................... 3-2 3.1.1 Overview ............................................................................................................................... 3-2 3.1.2 Measurement Report Handling ............................................................................................ 3-3 3.1.3 Power Control Algorithms ..................................................................................................... 3-5 3.1.4 Power Control Procedures ................................................................................................... 3-5 3.2 Huawei II Power Control Algorithm ............................................................................................... 3-6 3.2.1 Measurement Report Handling ............................................................................................ 3-7 3.2.2 Power Control Decision ........................................................................................................ 3-8 3.3 Huawei III Power Control Algorithm ............................................................................................ 3-10 3.3.1 Power Control Activation .................................................................................................... 3-11 3.3.2 Measurement Report Handling .......................................................................................... 3-11 3.3.3 Power Control Decision ...................................................................................................... 3-11 3.4 Optimized Huawei III Power Control Algorithm ........................................................................... 3-13 3.4.1 Measure Report Handling................................................................................................... 3-14 3.4.2 Calculation of the Power Control Step................................................................................ 3-15 3.4.3 Active Power Control .......................................................................................................... 3-15 3.4.4 SAIC Power Control Optimization ...................................................................................... 3-17

4 Engineering Guideline .............................................................................................................4-1 4.1 Overview ....................................................................................................................................... 4-1 4.2 Scenarios ...................................................................................................................................... 4-1 4.3 Key Parameters............................................................................................................................. 4-2 4.3.1 Algorithm Selection ............................................................................................................... 4-2 4.3.2 Common Parameters ........................................................................................................... 4-3 4.3.3 Huawei II Power Control Parameters ................................................................................... 4-3 4.3.4 Huawei III Power Control Parameters .................................................................................. 4-9 4.3.5 Optimized Huawei III Power Control Parameters ............................................................... 4-15 4.3.6 Active Power Control Parameters ...................................................................................... 4-17 4.3.7 SAIC Power Control Parameters ........................................................................................ 4-18 4.4 Little Used Parameters ................................................................................................................ 4-18

5 Parameters..................................................................................................................................5-1 6 Counters ......................................................................................................................................6-1

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Contents

7 Glossary ......................................................................................................................................7-1 8 Reference Documents .............................................................................................................8-1

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1 Introduction

1 Introduction 1.1 Scope This document describes the functions of and technologies regarding the Power Control feature of Huawei GBSS, including Huawei II Power Control algorithm (PCII), Huawei III Power Control algorithm (PCIII), Optimized Huawei III Power Control algorithm (PCIII Opt.), Single Antenna Interference Cancellation (SAIC) Power Control optimization, and active Power Control.

1.2 Intended Audience It is assumed that users of this document are familiar with GSM basics and have a working knowledge of GSM telecommunications. This document is intended for: 

Personnel working with Huawei GSM products or systems



System operators who need a general understanding of this feature

1.3 Change History The change history provides information on the changes in the Power Control feature in different document versions. There are two types of changes, which are defined as follows: 

Feature change: refers to the change in the Power Control feature of a specific product version.



Editorial change: refers to the change in wording or the addition of the information that was not described in the earlier version.

Document Issues The document issues are as follows: 

01 (2011-03-31)



Draft A (2011-01-15)

01 (2011-03-31) This is the commercial release of GBSS13.0. Compared with issue Draft A (2011-01-15) of GBSS13.0, this issue incorporates the changes described in the following table. Change Type Change Description

Parameter Change

Feature change

A parameter is added to The parameter PCHOCMPCON is improve power control accuracy added. and reduce the number of ping-pang handovers caused by the inconsistency between power control compensation and handover compensation.

Editorial change

The contents in Table 4-31 are None modified.

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1 Introduction

Draft A (2011-01-15) This is the draft release of GBSS13.0. Compared with issue 03 (2010-09-30) of GBSS12.0, this issue incorporates the changes described in the following table. Change Type Change Description

Parameter Change

Feature change

None

None

Editorial change

The issue optimizes the description, and adds “4 Engineering Guideline”.

None

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2 Overview

2 Overview Power Control is used to control the transmit power of the MS and BTS during a connection. The transmit power level is actively managed to provide the receive signal strength and quality desired. The benefits of Power Control are as follows: 

Decreased interference



Improved link quality consistency, specifically a reduction in bad calls



Less power consumption

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3 Technical Description

3 Technical Description 3.1 Principles 3.1.1 Overview Power Control aims to improve the link quality over the Um interface. After Power Control is enabled, the transmit power of the MS and BTS is adjusted according to the comprehensive decision made by the BSS. The decision on power adjustment is made on the basis of the specified thresholds, receive level, and receive quality on uplink and downlink. Based on the receive level and receive quality in the measurement report (MR), the BSS determines the transmit power of the MS and BTS through the Power Control algorithm. Power Control is performed to achieve the desired link quality with minimum possible transmit power. The reduction in the transmit power of the MS or BTS leads to the decrease in adjacent channel interference and power consumption. The reduced interference can help improve the quality experienced by some other connections. There are two types of Power Control: 

Uplink Power Control Uplink Power Control is used to adjust the transmit power of the MS. With this function, the receive signal strength of the BTS remains stable, and adjacent channel interference and MS power consumption are decreased.



Downlink Power Control Downlink Power Control is used to adjust the transmit power of the BTS. With this function, the receive signal strength of the MS remains stable, and adjacent channel interference and BTS power consumption are decreased.

Uplink Power Control and downlink Power Control adopt the same algorithms, although different parameters are involved. Unless otherwise specified, the algorithms described in this document apply to both uplink and downlink Power Control. Figure 3-1 shows the procedures for Power Control.

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Figure 3-1 Procedures for Power Control

As shown in Figure 3-1, the procedures for Power Control are as follows: 1. The MS or BTS measures the receive level and receive quality and then forwards the information to the BTS or BSC using MRs. 2. The BSS preprocesses the data, interpolating any missing values, and low pass filtering the data to desensitize the feature from fading variations 3. The BSS calculates the transmit power of the MS or BTS using the algorithms and then bounds checks the result. 4. The BSS sends the decided power level to the MS or BTS through an MS Power Control or a BS Power Control message. 5. The MS/BTS transmits signals at the power specified in the message.

3.1.2 Measurement Report Handling The MS measures the receive level and receive quality and reports them to the BTS in an MR. The BTS makes additional measurements on the uplink level and quality. The MRs are used for both Power Control and handover. The operator can choose to have filtering preprocessing performed in the BTS or BSC.

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The Power Control algorithm is applicable to only certain BTS products. If the BTS supports the algorithm in the BTS, the operator can choose if the algorithm is executed in BTS or BSC. The Power Control procedures at the BTS and BSC are functionally identical. The measurement report data is always forwarded to the BSC anyway, because it is needed for Handover (cell reselection) processing. Because the measurement report is always received in the BSC, the power control algorithm in fact will always execute in BSC anyway.

Processing location 

Parameter BTSMESRPTPREPROC controls whether the MRs can be processed at the BSC or BTS. If BTSMESRPTPREPROC is set to BTS_Preprocessing(BTS preprocessing), the MRs are processed at the BTS; if it is set to BSC_Preprocessing(BSC preprocessing), the BSC is used.



Parameter PRIMMESPPT controls whether the original MR message is sent to the BSC.



Parameter BSMSPWRLEV controls whether to enable the BTS to transfer BTS/MS power class to the BSC.



Parameter MRPREPROCFREQ controls the frequency at which the BTSs submit preprocessed measurement reports to the BSC.

These parameters affect the signaling flow over the Abis interface and the CPU processing load of the BSC. If the BTS sends the original MRs, the BSC performs MRs interpolation and filtering. The original MRs trigger Power Control at the BSC, whereas the preprocessed MRs trigger Power Control at the BTS. Depending on whether BTS support the PC algorithm, the BTS sends the preprocessed MRs, and performs main Power Control processing. If BTSMESRPTPREPROC is set to BTS, and PRIMMESPPT is set to YES, the original message will be sent to the BSC, but the BSC will in fact just ignore it.

If the BSC does not receive or ignores the MRs, this can degrade handover performance. If BTSMESRPTPREPROC is set to BTS, MR filtering is performed in BTS. Otherwise, it is done in BSC. The Power Control procedure at the BTS or BSC is functionally identical.

Measurement Type FULL/SUB The BSC processes the information in the MRs according to MEASURETYPE. Measurement result contains RxLev, RxQuality for uplink and downlink, MS power class, and BTS power class. The measurement values in the MRs are classified into FULL SET and SUB SET. Bursts may not be decoded for several reasons, for example because of bad interference, or because the burst was not sent, due to DTX. FULL SET indicates the average measurement value of all the bursts scheduled for the channel. Otherwise, SUB SET is used. The MRs from the MS and BTS also indicate whether the DTX is adopted. For details on the DTX, see the DTX feature. If the MRs indicate that DTX is adopted, then the measurement value of SUB SET is selected; otherwise, the measurement value of FULL SET is selected.

MR Interpolation If MR is missing, MR should be interpolation to MR list before filtering. This interpolation algorithm is different between PCII and PCIII/PCIII Opt.

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MR Filtering The PCII algorithm uses a sliding window filtering algorithm. The PCIII and PCIII Opt. algorithm always uses both a sliding window and exponential filtering algorithm.

3.1.3 Power Control Algorithms Huawei algorithms for Power Control consist of the PCII algorithm and the PCIII and PCIII Opt. algorithm, which have completely different approaches. The PCII algorithm is a dual-threshold power control algorithm, with the following features: 

MR compensation



Predictive filtering



Variable power control step for level



Fixed power control step of quality



Adjustment of the upper threshold of signal strength in the case of bad signal quality



Separate configuration of the adjustment step for uplink and downlink power control

The PC III and PCIII Opt. algorithm is a single setpoint algorithm for level and quality, resulting in a proportional adjustment, additionally having the following functions: 

Exponential filtering and sliding window filtering



Interpolation optimization



Comprehensive decision based on receive level and receive quality



Different thresholds for different speech rate types

3.1.4 Power Control Procedures The uplink Power Control procedure involves three SACCH MR periods. In the first period, the BTS sends the MS a Power Control command message. In the second period, the MS performs the power adjustment. In the third period, the MS notifies the BTS of the adjusted power. Figure 3-2 shows the uplink procedures for Power Control. Figure 3-2 Uplink Power Control procedures

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Uplink Power Control takes three SACCH MR periods: 1. The first SACCH MR period The BTS sends a power and TA adjustment command in the SACCH header. On receiving the command, the MS starts to perform Power Control in the second MR period. 2. The second SACCH MR period The rate at which the MS can change its power level is limited by the standards to 16 dB per SACCH period. − If

the power is adjusted by 16 dB or less, the change can be made one MR period (104 frames or 480 ms) is required for the power adjustment process.

− If

the power is adjusted by more than 16 dB, two (or possibly even more) MR periods are required for the power adjustment process.

The maximum rate for an MS to adjust its power is 2 dB every 13 frames or 60 ms. Even if a large change (for example 14 dB) can be made in a single period, note that the change cannot be made all at once, the power value use is increased in small steps inside the SACCH frame. This can affect the average values reported in the MR describing the RXLEV and Quality from this SACCH frame.

3. The third SACCH MR period The current transmit power, which is the power level of the last burst in the previous SACCH MR period, is saved and is reported to the BTS in the next MR on the uplink SACCH. The downlink Power Control procedures involve only two SACCH MR periods. Figure 3-3 shows the downlink procedures for Power Control. Figure 3-3 Downlink Power Control procedures

PCADJPERIOD controls the frequency that the power control cycle is executed, in units of MR periods. The default value is 3. A value greater than 3 leads to delayed performance of Power Control. A value smaller than 3 leads to more frequent performance of Power Control, which consumes more processing resources. It may enhance power control, but note that frequent power control combined with high adjust factors may result in instability (oscillation).

3.2 Huawei II Power Control Algorithm This section describes the feature GBFD-110703 Enhanced Power Control Algorithm. The PCII algorithm involves MR compensation, prediction filtering, and calculation of adjustment step based on receive level and receive quality, as shown in Figure 3-4.

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Figure 3-4 Procedures for Huawei II Power Control algorithm

3.2.1 Measurement Report Handling The MR Handling in the PCII algorithm involves the following stages: 1.

MR interpolation The Power Control algorithm is normally event driven by the MR. If an MR is missing, normally the algorithm is not executed and no new power command will result at that time, until the next MR is finally received. If the number of lost MRs exceeds MRMISSCOUNT, the system clears the current MR queue and just keeps the current Power Control level. If a new MR is received before the number of lost MRs exceeds MRMISSCOUNT, the MR interpolation is performed. In PCII a linear interpolation algorithm is used. If the value of MS transmit power (MSPwr) is missing from the MR it is not interpolated, MR filtering is not affected, and Power Control procedure proceeds normally.

2.

MR compensation Because the MRs may be obtained by the BTS or MS at varying transmit power, the algorithm can compensate the receive values to take account of the transmit power used. MR compensation is controlled by the parameter MRCOMPREG.

3.

Discarding of MRs in the initial phase of connection In the initial phase of connection, the algorithm does not perform Power Control until the connection has established and become stable. The PCII algorithm discards the first four MRs.

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GSM BSS Power Control 4.


MR filtering The Power Control decision is based on filtered values derived from the incoming stream of MRs. Huawei Power Control II uses a sliding window type filter that gives an output equal to the average of the last n values, where n is the length of the window. The filter length can be configured independently for level and quality. Uplink and downlink use parameters ULLEVFILTLEN/DLLEVFILTLEN and ULQUAFILTLEN/DLQUAFILTLEN. Due to the delay between the Power Control decision and power adjustment, the (filtered) measurement report data does not accurately indicate real-time values. To minimize the effects of this, a predictive compensation is applied, that extrapolates any trend in the historic MRs to estimate what the current value should be if there was no delay. Generally, the interval between Power Control decision and power adjustment is three MRs for uplink and two for downlink. The length of the look ahead prediction is specified by ULPREDLEND/DLPREDLEND. After filtering the interpolated and extrapolated (predicted) MRs, the algorithm makes a decision on Power Control.

The prediction filtering applies only to the receive level. If ULPREDLEND/DLPREDLEND is 0, no extrapolation (prediction) is performed, so the algorithm is driven simply by the output from the filter. If ULLEVFILTLEN/DLLEVFILTLEN is less than 5, Mean-value filtering is applied; otherwise, predictive filtering (weighted filtering for most recent MRs and Mean-value filtering for the older MRs) is applied.

3.2.2 Power Control Decision In the PCII algorithm the Power Control decision takes into account both level and quality and upper and lower thresholds are set for both level and quality, uplink and downlink (ULSSHIGHTHRED, ULSSLOWTHRED and ULQHIGHTHRED, ULQLOWTHRED and DLSSHIGHTHRED, DLSSLOWTHRED and DLQHIGHTHRED, DLQLOWTHRED). Figure 3-5 shows how the adjustment is derived given particular values for level and quality.

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Figure 3-5 Power adjustment Receive Quality 0 ↑ AdjStep_Lev

↓ AdjStep_Qul

↓ MAX(AdjStep_L ev, AdjStep_Qul)

↑ AdjStep_Lev

No Action

↓ AdjStep_Lev

↑ MAX(AdjStep_Lev, AdjStep_Qul)

↑ AdjStep_Qul

No Action

UL/DL Qual. Upper Threshold

UL/DL Qual. Lower Threshold

7 0

63 UL/DL RX_LEV UL/DL RX_LEV Lower Threshold Upper Threshold

Receive Level

The Power Control decision in PCII algorithm involves the following stages: 1.

Calculation of power adjustment step based on receive level (RxLev) The power adjustment is constrained, if the transmitter is already on full power, it is not possible to increase the power any more. The calculation is the same for both uplink and downlink. Only uplink is shown in Figure 3-5. When RxLev is less than the desired threshold ULSSLOWTHRED, the power should be increased, the formula is as follows: power_adjustment_step = min {abs(0.5 x (ULSSHIGHTHRED + ULSSLOWTHRED) – RxLev), MaxValAdjrx} When RxLev is less than ULSSHIGHTHRED, a threshold that defines a reasonable margin above the noise floor, the power should not be decreased further. In the PCII algorithm, receive quality is classified into three quality zones (low = 0, 1-2, ≥3). The maximum step of power adjustment on uplink may be different for the three quality zones. These steps are specified by MAXSTEP0, MAXSTEP1, and MAXSTEP2. When the value of RxLev requires the power be decreased MAXSTEPx (x=0, 1, 2) step is selected according to receive quality. The formula is as follows: power_adjustment_step = min {abs (0.5 x (ULSSHIGHTHRED + ULSSLOWTHRED) – RxLev), MAXSTEPx}

2.

Calculation of power adjustment step based on receive quality (RxQual) When RxQual is greater than or equal to ULQLOWTHRED, the power should be increased. The adjustment step is specified by MAXADJPCVAL. The power can be increased only when (Rxlev + MAXADJPCVAL) ≤ ULSSHIGHTHRED

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When the quality is poor for a call (when RxQual is greater than or equal to ULQUALBADTRIG), the value of ULQUALBADUPLEV is increased for this cycle only. When RxQual is less than ULQHIGHTHRED, the power should be decreased. The adjustment step is specified by QUALSTEP. The power can be decreased only when (RxLev – QUALSTEP) ≥ ULSSLOWTHRED 3.

Calculation of power adjustment step based on both RxLev and RxQual To ensure the stability of power adjustment, both AdjStep_Lev and AdjStep_Qual should be taken into consideration. If the RxLev decision considers that it is safe to reduce the power, the algorithm decides to increase or decrease the power depending on the quality. If the RxLev decision considers that it is not safe to reduce the power, the algorithm may increase the power or leave it the same, but cannot decrease it further.

The procedures for Power Control for AMR calls is the same as that for non-AMR calls but different parameters are involved. For details, see AMR Power Control of the AMR feature.

3.3 Huawei III Power Control Algorithm This section describes the feature GBFD-117601 HUAWEI III Power Control Algorithm. The PCIII algorithm involves MR interpolation, MR filtering, and calculation of adjustment step, as shown in Figure 3-6. Figure 3-6 Procedures for Huawei III Power Control algorithm

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3.3.1 Power Control Activation Power Control can be activated or deactivated for AMR and non-AMR calls independently using parameters AMRCALLPCALLOWED and NONAMRCALLPCALLOWED. Calls that with Power Control disabled use full power.

3.3.2 Measurement Report Handling When the PCIII algorithm is applied, a fixed number of MRs are discarded during the initial access of the MS to the network to prevent the impact of inaccurate MRs on the algorithm. The number of discarded MRs is specified by SDMRCUTNUM (SDCCH) and TCHMRCUTNUM (TCH). Active Power Control is enabled and the MRs are not discarded when parameter PWRBCDALLOWD is set to YES.

The MR processing in the PCIII algorithm involves the following stages: 1.

MR interpolation



If RXLEV values are missing, a value is interpolated linearly.



If RXQUAL values are missing, the missed value is replaced with a synthetically generated "worst possible" Quality (RXQUAL=7)



The value of MS/BTS transmit power missing from the MRs is not interpolated. In such a case, MR filtering is not affected, and Power Control procedure proceeds normally.



The interpolation is not performed in the case that the measurement results are lost.



If the number of continuously lost MRs is greater than the value of MRMISSNUM, the Power Control procedures stop. The procedures will resume when a new MR is received.

2.

MR filtering MR filtering in the PCIII algorithm involves exponential filtering and sliding window filtering. In the process of calculation, receive quality is converted into C/I. In MR filtering, exponential filtering and sliding window filtering are performed on C/I and receive level in succession. The measurement value obtained through the filtering is used to decide whether Power Control is performed. In the PCIII algorithm, the filtering periods are specified by the following parameters:



Uplink: ULREXLEVEXPFLTLEN, ULREXQUALEXPFLTLEN, ULREXLEVSLDWINDOW, and ULREXQUALSLDWINDOW



Downlink: DLREXLEVEXPFLTLEN, DLREXQUALEXPFLTLEN, DLREXLEVSLDWINDOW, and DLREXQUALSLDWINDOW

3.3.3 Power Control Decision Power Control decision in the PCIII algorithm involves the following stages: 

If it is within the specified range, Power Control is performed.



The gain of the channels on the Um interface is obtained through calculation.



The adjustment step is calculated on the basis of the gain, RxLev, and RxQual after filtering.



The calculated step will be checked to determine whether it exceeds the maximum step allowed.

1. Decision on whether Power Control should be performed Power Control is not required when ULREXLEVHIGHTHRED ≥ Rxlev ≥ ULREXLEVLOWTHRED and UL**REXQUALHIGHTHRED ≥ RxQual ≥ UL**REXQUALLOWTHRED.

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Otherwise, the calculation of the adjustment step starts. In Huawei III Power Control algorithm, different quality level thresholds are set for different speech coding schemes. The symbol ** represents full-rate service (FS), half-rate service (HS), AMR full-rate service (AFS), or AMR half-rate service (AHS).

2. Calculation of adjustment step The PCII algorithm is based on dual thresholds, and increases the power if the channel is below the lower threshold, and reduces the power if it is above the upper threshold. The PCIII algorithm is quite different and is a P controller. That is to say the adjustment made is simply proportional to the difference (and "error") between a configured setpoint and the current (filtered) control metric. The error is computed and scaled for both a level and quality term. That is, there is a level setpoint and gain, and a quality setpoint and gain. The controller computes the adjustment ("step") for each cycle and this is added to the preceding power attenuation to give the power attenuation to be used in this cycle.

Calculating the BTS Power Control Step In each power control period, the power control adjustment step is calculated on the basis of the receive level and receive quality. g(k) = p(k) – (ca_filtered(k) + qa_filtered(k) – 10 x log10 (1 + 10^( qa_filtered(k)/10))) SThr = (SThrUp + SThrDown)/2 QThr = (QThrUp + QThrDown)/2 step(k) = –(sfactor x (BsTxMaxPower – g(k) – SThr) + qfactor x (qa_filtered(k) – QThr)) If step (k) > 0, step (k) = 0. Where, SthrUp: indicates downlink receive level upper threshold that is specified by DLRexLevHighThred. SThrDown: indicates downlink receive level lower threshold that is specified by DLRexLevLowthred. QThrUp =DL**RexQualHighThred QthrDown = DL**RexQualLowThred Sfactor = DLREXLEVADJFCTR BsTxMaxPowe: the maximum transmit power of the TRX used for the call Qfactor = DLREXQUALADJFCTR g (k): gain of the radio channel (referred to as path loss of the channel) qa_filtered (k): MR of the filtered receive quality (converted to CIR) ca_filtered(k): MR of the filtered receive level p(k): transmit power of the BTS You can calculate the valid level through the CIR and the receive level (including the valid signals and the interference signals), and then calculate the channel gain by distracting the valid level from the transmit power. To prevent excessive adjustment, control the range of step (k) by setting DLMAXUPSTEP or DLMAXDOWNSTEP. If the value of step (k) is greater than the maximum allowable step length, the Issue 01 (2011-03-31)


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power is controlled according to the maximum allowed step set in this parameter. DLMAXUPSTEP indicates maximum step by which to increase downlink power according to signal strength. DLMAXDOWNSTEP indicates maximum step by which to decrease downlink power according to signal strength.

Calculating the MS Power Control Step In each power control period, the power control adjustment step is calculated on the basis of the receive level and receive quality. g(k) = p(k) – (ca_filtered(k) + qa_filtered(k) – 10 x log10 (1 + 10^( qa_filtered(k)/10))) SThr = (SThrUp + SThrDown)/2 QThr = (QThrUp + QThrDown)/2 step(k) = –(sfactor x (MsTxMaxPower– g(k) – SThr) + qfactor x (qa_filtered(k) – QThr)) If step(k) > 0, step(k) = 0. Where, SthrUp: indicates uplink receive level upper threshold that is specified by ULRexLevHighThred. SThrDown: indicates uplink receive level lower threshold that is specified by ULRexLevLowthred. QThrUp = UL**RexQualHighThred QThrDown = UL**RexQualLowThred Sfactor = ULREXLEVADJFCTR MsTxMaxPower: maximum transmit power in the MS classmark Qfactor = ULREXQUALADJFCTR g(k): gain of the radio channel (referred to as path loss of the channel) qa_filtered (k): filtered receive quality (converted to CIR) ca_filtered(k): MR of the filtered receive level p(k): transmit power of the MS To prevent excessive adjustment, control the range of step (k) by setting ULMAXUPSTEP/ULMAXDOWNSTEP. If the value of step(k) is greater than the allowed maximum step length, the power is controlled according to the maximum allowed step set in this parameter. By default, the minimum power adjustment step is 2 dB, but some BTS products support higher resolution Power Control, in 0.2 dB steps. This provides enhanced performance. This is controlled by parameter FINESTEPPCALLOWED.

3.4 Optimized Huawei III Power Control Algorithm The process of the PCIII Opt. algorithm is the same as the process of the PCIII algorithm. The PCIII Opt. algorithm involves MR processing, MR filtering, calculation of the Power Control step, and Power Control execution. The PCIII Opt. algorithm takes effect when PWRCTRLSW is set to PWR3 (Power Control III) and PWRCTRLOPTIMIZEDEN is set to YES. This section describes the improvements of the PCIII Opt. algorithm over the PCIII algorithm.

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3.4.1 Measure Report Handling 1. MR Power Control compensation MR Power Control compensation aims to compensate the receive level and receive quality so that they reach the measured values at the maximum transmit power. In the PCIII Opt. algorithm, the receive level and receive quality reported through the MR are compensated. Subsequently, the receive level after compensation and the receive quality after compensation are used as inputs for MR filtering. The formula for calculating the quality compensation value is as follows: Quality compensation value = 2 x Power control level The formula for calculating the level compensation value is as follows: 

When the current CS session is carried on the BCCH TRX: − If

frequency hopping (FH) is not used or the BCCH frequency is not involved in FH, the BSS does not compensate for power control.

− If

the BCCH frequency is involved in FH and CANPC is set to YES, Level compensation value = 2 x Power control level; when the BCCH frequency is involved in FH and CANPC is set to NO, Level compensation value = (N-1)/N x Power control level x 2, where N is the number of frequencies involved in FH.



When the current CS session is not carried on the BCCH TRX: − If

the BCCH frequency is not involved in FH, Level compensation value = 2 x Power control level.

− If

the BCCH frequency is involved in FH and CANPC is set to YES, Level compensation value = 2 x Power control level; when the BCCH frequency is involved in FH and CANPC is set to NO, Level compensation value = (N-1)/N x Power control level x 2, where N is the number of frequencies involved in FH.

If baseband FH is used and the BCCH frequency is involved, it is recommended that PCHOCMPCON be set to ON. By doing this, power control accuracy is improved. This also reduces the number of ping-pang handovers caused by the inconsistency between power control compensation and handover compensation.

2. Dual-coefficient MR filtering algorithm The PCIII Opt. algorithm adopts an exponential filtering algorithm and MR filtering adopts the dual-coefficient filtering algorithm. The dual-coefficient filtering algorithm concerns the receive level and the receive quality. This algorithm has a strong correlation with the filtering period K and the filter adjustment factor FiltAdjustFactor. The values of K and FiltAdjustFactor vary with the measured receive level and receive quality: − The

value of K depends on ULREXLEVEXPFLTLEN/DLREXLEVEXPFLTLEN and ULREXQUALEXPFLTLEN/DLREXQUALEXPFLTLEN.

− The

value of FiltAdjustFactor, can be adjusted using parameter ULFILTADJFACTOR.

In this section, the symbol / separates two independent parameters. For example, ULREXLEVEXPFLTLEN/DLREXLEVEXPFLTLEN indicates ULREXLEVEXPFLTLEN or DLREXLEVEXPFLTLEN. ULREXLEVEXPFLTLEN and DLREXLEVEXPFLTLEN take effect in uplink Power Control and downlink Power Control respectively.

In the dual-coefficient exponential filtering algorithm, the filter response rate increases when the radio propagation environment deteriorates. In this case, the filter length is K. The rate of increasing the filtering value decreases when the radio propagation environment becomes better. In this case, the filter length is K x FiltAdjustFactor.

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3.4.2 Calculation of the Power Control Step The Power Control step of the PCIII Opt. algorithm is calculated on the basis of two step factors: output1(k) and output2(k). The methods of calculating power control step are similar in the uplink and downlink. This section uses the uplink as an example. output1(k) is determined by RexLev_pf, RexQual_pf, STarget, and QTarget. The calculation formula is as follows: output1(k) = - {RexLev_pf x (ca_filtered(k) - STarget) + RexQual_pf x(qa_filtered(k) - QTarget)} Where, RexLev_pf indicates ULRXLEVPROTECTFACTOR. ca_filtered(k) indicates the measured receive level after the filtering. STarget = ULREXLEVHIGHTHRED. RexQual_pf = ULRXQUALPROTECTFACTOR. qa_filtered(k) indicates the measured receive quality after the filtering. QTarget = ULFSREXQUALHIGHTHRED. output2(k) is determined by sfactor, qfactor, STarget, and QTarget. The calculation formula is as follows: output2(k) = - {sfactor x (ca_filtered(k) - STarget) + qfactor x (qa_filtered(k) - QTarget)} Where, sfactor indicates RxLev Adjustment Factor ULREXLEVADJFCTR. ca_filtered(k) indicates the measured receive level after the filtering. STarget indicates RxLev setpoint, ULREXLEVHIGHTHRED. qfactor indicates RxQual Adjustment Factor, ULREXQUALADJFCTR. qa_filtered(k) indicates the measured receive quality after the filtering. QTarget indicates RxQual setpoint, ULFSREXQUALHIGHTHRED. The step factor output(k) is determined according to the formula output(k) = max(output1(k), output2(k)). Subsequently, based on this step factor, Power Control adjustment is performed. If output(k) is greater than 0, then output(k) is set equal to 0, that is, transmit power is not adjusted. By default, the minimum power adjustment step is 2 dB, but some BTS products support higher resolution Power Control, in 0.2 dB steps. This provides enhanced performance. This is controlled by parameter FINESTEPPCALLOWED.

3.5 Functions Related to Power Control 3.5.1 Active Power Control This section describes the feature GBFD-117602 Active Power Control. Power Control is used to control the transmit power of the MS and BTS during a connection. For better results of Power Control, the MS and BTS should transmit signals at a proper power instead of the

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maximum power when the connection is initially established. To achieve this, Active Power Control must be enabled. Active Power Control enables the immediate performance of Power Control after an MS successfully gains access to the network or a handover is successfully performed in the BSC. In such a case, the BSC can control the uplink and downlink power promptly. Therefore, both the BTS and the MS transmit signals at a proper power. Active Power Control aims to reduce the system interference, improve the link quality, and decrease the power consumption of both the BTS and MS. Active Power Control is enabled when the parameter PWRBCDALLOWD is set to Yes.

Active Power Control During the Access of an MS The procedures for Active Power Control during the initial access of an MS are as follows: 1.



The BSC acquires the uplink and downlink path loss on the basis of the receive level in the MR of the MS on the signaling channel, transmit power of MS and BTS, and parameters DOUBLEANTENNAGAIN, COMBINERLOSS, and PATHLOSS. Based on whether the BCCH and TCH belong to the same frequency band, the path loss of the uplink and downlink channels can be estimated as follows: If the BCCH and TCH belong to the same frequency band (for example, both work in GSM850/GSM900 or DCS1800/PCS1900), then: Path loss estimation of the uplink channel = Maximum transmit power of the MS in the cell – Uplink receive level Path loss estimation of the downlink channel = Transmit power of the BTS – Downlink receive level +COMBINERLOSS + DOUBLEANTENNAGAIN



If the BCCH and TCH belong to different frequency bands, then, a compensation for path loss is necessary.



If the TRX of the TCH works on GSM850/GSM900 while the TRX of the BCCH works on DCS1800/PCS1900, then: Path loss estimation of the uplink channel = Maximum transmit power of the MS in the cell – Uplink receive level – PATHLOSS Path loss estimation of the downlink channel = Transmit power of the BTS – Downlink receive level + COMBINERLOSS + DOUBLEANTENNAGAIN – PATHLOSS



If the TRX of the TCH works on DCS1800/PCS1900 while the TRX of the BCCH works on GSM850/GSM900, then: Path loss estimation of the uplink channel = Maximum transmit power of the MS in the cell – Uplink receive level + PATHLOSS Path loss estimation of the downlink channel = Transmit power of the BTS – Downlink receive level + COMBINERLOSS + DOUBLEANTENNAGAIN + PATHLOSS

2.

Based on the uplink and downlink path loss and the parameters EXPULRXLEV and EXPDLRXLEV, the BSC estimates the transmit power that the BTS and MS should adopt on the assigned traffic channel.

3.

The MS adopts the previously-mentioned power as the transmit power when it is initially assigned with a traffic channel, thereby reducing the initial transmit power.

Active Power Control During Inner-BSC Handover The procedures for active Power Control during inner-BSC handover are as follows: 1.

The BSC acquires the uplink and downlink path loss on the basis of the level of the BCCH in the target cell, transmit power of MS and BTS, and value of PATHLOSS.

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GSM BSS Power Control 2.


Based on the uplink and downlink path loss and the parameters EXPULRXLEV and EXPDLRXLEV, the BSC estimates the transmit power that the BTS and MS should adopt on the channel of the target cell. Uplink transmit power = EXPULRXLEV – 110 dBm + Path loss estimation of the uplink channel Downlink transmit power = EXPDLRXLEV – 110 dBm + Path loss estimation of the downlink channel

3.

The MS adopts the previously-mentioned power as the transmit power when it gains access to the target cell, thereby reducing the transmit power during the access.

3.5.2 SAIC Power Control Optimization This section describes the feature GBFD-118103 Network Support SAIC. Single Antenna Interference Cancellation (SAIC) is used to reduce the impact of interference on the reception of downlink signals through a signal processing technology. An MS enabled with SAIC has improved ability of anti-interference. After SAIC is enabled, the thresholds for BSC/BTS Power Control are adjusted to improve the radio performance of the BSS. SAIC is enabled when the parameters SAICALLOWED and BTSSAICPCADJSWITCH are set to Yes. The policies for threshold adjustment are as follows: 

When the PCII algorithm is applied, the value of SAICTHREDAPDTVALUE is added to that of DLQHIGHTHRED and DLQLOWTHRED.



When the PCIII or PCIII Opt. algorithm is applied, the value of SAICTHREDAPDTVALUE is deducted from that of UL**REXQUALHIGHTHRED/DL**REXQUALHIGHTHRED and UL**REXQUALLOWTHRED/DL**REXQUALLOWTHRED.

** indicates FS (full rate), HS (half rate), AFS (AMR full rate), or AHS (AMR half rate).

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4 Engineering Guideline 4.1 Overview This section introduces common real world scenarios and gives guidance on the parameter setting to choose for these varied environments.

4.2 Scenarios Scenarios vary from one network to another. The main scenarios are as follows: Table 4-1 Main scenarios Application Scenario

Reference Value

Feature Description

Effect on Parameters

Densely-populated urban EFL=16 area BTS spacing: 420 m

To ensure large capacity and indoor coverage, the BTS spacing is small. 900 MHz Thus, the outdoor level is BCCH 1/12 high and the overlapped coverage areas are large. TCH 1/3, Because the frequency TCH pseudo random reuse is tight and the EFL hopping on 4 frequencies, is high, the interference is DTX on full-rate AMR V3 strong. This makes good 25M mast height Mobility performance from power on, TU3 control very important to maximize quality Huawei Handover II

Power control: Generally, power control should be performed on the basis of link quality such as BER.

Urban area

EFL=14

Power control: Generally, power control should be performed on the basis of link quality such as BER.

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To ensure large capacity and indoor coverage, the BTS spacing: 1200 m BTS spacing is small. 900 MHz Thus, the outdoor level is BCCH 1/12 high and the overlapped coverage areas are large. TCH 1/3, Because the frequency TCH pseudo random reuse is tight and the EFL hopping on 4 frequencies, is high, the interference is DTX on full-rate AMR V3 strong. This makes good 30M mast height Mobility performance from power on, TU3 Huawei Handover control very important to II maximize quality


4-1

GSM BSS Power Control Suburb

6 Counters EFL=12

Firstly, good coverage and Power control: Generally, appropriate capacity power control should be BTS spacing: 5300 m should be ensured for the performed on the basis of 900 MHz vicinity of the BTS. RxLev and RxQual. BCCH 1/12 Secondly, The coverage of the surrounding areas TCH 1/3, should be as large as TCH pseudo random possible. Therefore, the hopping on 4 frequencies, coverage level is of great DTX on full-rate AMR V3 importance. Generally, the 30M mast height Mobility indoor-and-outdoor on, TU3 Huawei Handover cooperation policy is not II considered. This scenario is regarded as a coverage limitation scenario.

Rural area

EFL=12

The BTS spacing is large and the capacity is small. BTS spacing:15000 m The coverage signal level 900 MHz is the determinant factor. BCCH 1/12 The focus is to ensure good network coverage. TCH 1/12, Generally, the TCH pseudo random indoor-and-outdoor hopping on 4 frequencies, cooperation policy is not DTX on full-rate AMR V3 considered. 30M mast height Mobility Generally, this scenario is on, TU3 Huawei Handover not an interference II limitation one but a signal

Power control: Generally, power control should be performed on the basis of RxLev.

level limitation one.

4.3 Key Parameters 4.3.1 Algorithm Selection PWRCTRLSW and PWRCTRLOPTIMIZEDEN specify algorithm switchover. PWRCTRLSW specifies whether to enable PCII or PCIII algorithm. When PWRCTRLSW is set to PWR3, Huawei PCIII algorithm is enabled. PWRCTRLOPTIMIZEDEN specifies whether to enable the PCIII Opt. algorithm. When PWRCTRLSW is set to PWR3 and PWRCTRLOPTIMIZEDEN is set to YES, the PCIII Opt. algorithm is enabled. Algorithm switchover involves PCII to PCIII, PCII to PCIII Opt., and PCIII to PCIII Opt. switchovers. The detailed commands are as follows: 

PCII to PCIII switchover To enable the PCIII algorithm, run the SET GCELLPWR3 command with PWRCTRLOPTIMIZEDEN set to NO. Run the SET GCELLPWRBASIC command with PWRCTRLSW set to PWR3.



PCII to PCIII Opt. switchover

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To enable the PCIII Opt. algorithm, run the SET GCELLPWR3 command with PWRCTRLOPTIMIZEDEN set to YES. Run the SET GCELLPWRBASIC command with PWRCTRLSW set to PWR3. 

PCIII to PCIII Opt. switchover

To enable the PCIII algorithm, run the SET GCELLPWR3 command with PWRCTRLOPTIMIZEDEN set to YES.

4.3.2 Common Parameters The following parameters are used by more than one algorithm. Measurement Report Type and Measurement Report Preprocessing: The Enhanced Measurement Report supports the measurement of the 3G neighbor cells to enable interoperability between 2G and 3G systems and therefore ensures service continuity. It also supports more information such as BER and FER. Normally, the Normal Measurement Report for the power control and handover algorithms are used. If the BSC load is very high or the Abis capacity is limited, processing in the BTS is advantageous to off load the BSC CPU, but this degrades handover performance slightly. It is recommended that operators review the CPU load of the BSC and Abis capacity before deciding where processing should take place. If the load can support power control processing in BSC, processing in the BSC is preferred because this allows improved handover performance. If the BTS is used to process the measurement reports, the BTS decides the frequency at which processed results are sent. During the process, certain MRs are missing and will affect HO performance. Therefore, operators must balance between CPU load and reduced accuracy in measurement history due to missing MRs. Table 4-2 Key parameters for MR processing Parameter ID

Value Range

Recommended Value

MEASURETYPE

EnhMeasReport(Enhanced Measurement Report), ComMeasReport ComMeasReport(Common Measurement Report)

BTSMESRPTPREPROC

BSC_Preprocessing(BSC preprocessing), BTS_Preprocessing(BTS preprocessing)

BSC_Preprocessing

PRIMMESPPT

NO, YES

YES

BSMSPWRLEV

NO, YES

YES Twice_ps

MRPREPROCFREQ

NOreport(Do not report), Twice_ps(Twice every second), Once_ps(Once every second), Once_2s(Once every two second), Once_4s(Once every four second)

4.3.3 Huawei II Power Control Parameters 1.

Function Activation

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When PWRCTRLSW is set to PWR2, Huawei II Power Control algorithm is activated. Huawei recommends the Optimized Huawei III Power Control algorithm. The parameters UPPCEN and DNPCEN control whether to activate uplink power control and downlink power control for a cell. Table 4-3 Function activation parameters Parameter ID

Value Range

Recommended Value

PWRCTRLSW

PWR2 (PCII), PWR3 (PCIII)

PWR3

UPPCEN

NO, YES

YES

DNPCEN

NO, YES

YES

2.

Period Control PCADJPERIOD controls the minimum interval between two consecutive power control commands, If this parameter is set to a too great value, effective power control may be delayed. If this parameter is set to a small value, Radio performance may be improved but more processing and Abis resources will be consumed. Note that the PC value must be considered when setting the PC adjust factors, if a high adjust factor is combined with a high PC frequency (low value for PC interval) the power control may become unstable (oscillate)

Table 4-4 Period control parameters Parameter ID

Value Range

Recommended Value

PCADJPERIOD

1 to 15

3

AMRPCADJPERIOD

1 to 15

3

3.

MR interpolation MRMISSCOUNT decides the number of measurement reports sampled for averaging the signal strength on a speech/data channel. Averaging the signal strength in multiple measurement reports helps to avoid a sharp signal level drop due to Rayleigh fading and to ensure the comprehensiveness of a handover decision. If this parameter value is too big, old MR information won’t reflect the current environment. If this parameter is too small, Power Control information will be re-initialized, which will delay power control response time.

Table 4-5 Interpolation parameters Parameter ID

Value Range

Recommended Value

MRMISSCOUNT

0 to 31

4

4.

MR compensation The algorithm may receive the level and quality at different transmit powers, to ensure that correct receive level values and receive quality values are used in filtering, compensation should be applied to the receive level values and receive quality values in historical measurement reports obtained when transmit power was different from the current value. MRCOMPREG controls whether the PCII algorithm allows measurement report compensation.

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Table 4-6 Compensation parameters Parameter ID

Value Range

Recommended Value

MRCOMPREG

NO, YES

YES

AMRMRCOMPREG

NO, YES

YES

5.

Discarding of MRs in the initial phase of connection No key parameter is related to this procedure.

6.

MR filtering The filtering parameters specify the number of measurement reports sampled for calculating the average value of the downlink signal strength before the BTS power adjustment. It is recommended that these parameters be set to 5 to balance between MR stability and response time. For high speed scenarios these parameters should be reduced to improve response time, Huawei recommends 3.

Table 4-7 Filtering parameters for Non-AMR Parameter ID

Value Range

Recommended Value High Density

Urban

Rural

ULLEVFILTLEN

1 to 20

3

5

5

DLLEVFILTLEN

1 to 20

3

5

5

ULQUAFILTLEN

1 to 20

3

5

5

DLQUAFILTLEN

1 to 20

3

5

5

Table 4-8 Filtering parameters for AMR Parameter ID

Value Range

Recommended Value High Density

Urban

Rural

AMRULLEVFTLEN

1 to 20

3

5

5

AMRDLLEVFTLEN

1 to 20

3

5

5

AMRULQUAFTLEN

1 to 20

3

5

5

AMRDLQUAFTLEN

1 to 20

3

5

5

7.

Core Algorithm

Algorithm summary The PCII algorithm divides the overall air interface quality into nine areas according to the receive level and receive quality over the air interface. The nine areas are divided by upper and lower thresholds of receive quality and upper and lower thresholds of receive level. The air interface quality of a call is determined based on the measured values. Different adjustment directions and adjustment steps are then selected for the nine areas. The objective of power control is to keep the receive level and receive

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quality at the optimum level (the central area in the following figure where no action is needed any more). Receive Quality 0 ↑ AdjStep_Lev

↓ AdjStep_Qul

↓ MAX(AdjStep_L ev, AdjStep_Qul)

↑ AdjStep_Lev

No Action

↓ AdjStep_Lev

↑ MAX(AdjStep_Lev, AdjStep_Qul)

↑ AdjStep_Qul

No Action

UL/DL Qual. Upper Threshold

UL/DL Qual. Lower Threshold

7 0

63 UL/DL RX_LEV UL/DL RX_LEV Lower Threshold Upper Threshold

Receive Level

When the network quality deteriorates because of low level, the algorithm increases the transmission power of the MS or BTS. When network quality deteriorates due to high interference caused by increased transmission power, the algorithm reduces the transmission power of the MS or BTS. Table 4-9 Classification of the PCII algorithm threshold parameters (uplink)

Quality

Level

No-AMR

AMR

Upper threshold

ULQHIGHTHRED

AMRULQHTHRED

Lower threshold

ULQLOWTHRED

AMRULQLOWTHRED

Upper threshold

ULSSHIGHTHRED

AMRULSSHTHRED

Lower threshold

ULSSLOWTHRED

AMRULSSLTHRED

Table 4-10 Classification of the PCII algorithm threshold parameters (downlink)

Quality

Level

No-AMR

AMR

Upper threshold

DLQHIGHTHRED

AMRDLQHTHRED

Lower threshold

DLQLOWTHRED

AMRDLQLTHRED

Upper threshold

DLSSHIGHTHRED

AMRDLSSHTHRED

Lower threshold

DLSSLOWTHRED

AMRDLSSLTHRED

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Key issues for parameter setting 

The parameter setting suggestion for different scenarios The receive level threshold in interference-restricted scenarios (high density urban areas) should be set lower than that in common urban scenarios, whereas the receive level threshold in coverage-restricted scenarios (rural areas) should be set higher than that in common urban scenarios. In high-speed scenarios, an increased margin should be provided to allow for more rapid changes in the path loss due to mobility through the terrain. In such scenarios, therefore, the receive level threshold and receive quality threshold should be set to a bit higher than those in common scenarios. In addition, the power control filter length can be set to a lower value to enhance transient response of the algorithm.



The parameter setting suggestion for uplink and downlink The receiver sensitivity of the BTS is higher than that of the MS, therefore the BTS receive level can be lower than the MS receive level. In common urban scenarios it is recommended that the uplink power control threshold is set equal to or lower than the downlink power control threshold.



The parameter setting suggestion for AMR call and non-AMR call AMR calls have better speech encoding/decoding capability than common calls, therefore the receive level threshold can be set to a lower value for AMR calls and the receive quality threshold to a higher level (worse) in order to reduce network interference. The PCII algorithm supports separate power control threshold configurations for non-AMR calls and AMR calls.



The parameter setting suggestion for Upper and Lower threshold If the difference between upper and lower receive levels and the difference between upper and lower receive quality are small, or if the adjustment step is scaled up or down too much within a power control period, the algorithm may become unstable. The recommended separation between upper and lower receive levels is 8-18 dB.

Table 4-11 Parameter baseline for PCII core algorithm Parameter ID

Value Range

Recommen ded Value

ULSSHIGHTHRED

0 to 63

30

ULSSLOWTHRED

0 to 63

18

ULQHIGHTHRED

0 to 7

0

ULQLOWTHRED

0 to 7

3

DLSSHIGHTHRED

0 to 63

45

DLSSLOWTHRED

0 to 63

28

DLQHIGHTHRED

0 to 7

0

DLQLOWTHRED

0 to 7

2

AMRULSSHTHRED

0 to 63

30

AMRULSSLTHRED

0 to 63

18

AMRULQHTHRED

0 to 7

0

AMRULQLOWTHRED

0 to 7

3

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Parameter ID

Value Range

Recommen ded Value

AMRDLSSHTHRED

0 to 63

33

AMRDLSSLTHRED

0 to 63

25

AMRDLQHTHRED

0 to 7

0

AMRDLQLTHRED

0 to 7

3

Table 4-12 Classification of the PCII algorithm protection parameters PC Direction Control by Level or Quality

Non-AMR Call

AMR Call

Raise power

By level

MAXVALADJRX

AMRMAXVALADJRX

By quality

MAXADJPCVAL

AMRMAXADJPCVAL

By level

MAXSTEP0

AMRMAXSTEP0

MAXSTEP1

AMRMAXSTEP1

MAXSTEP2

AMRMAXSTEP2

QUALSTEP

AMRQUALSTEP

Decrease power

By quality

Table 4-13 Classification of the PCII algorithm bad quality threshold parameters Direction

Trigger Threshold or Offset

Non-AMR Calls

AMR Calls

Uplink

Threshold offset

ULQUALBADUPLEV

AMRULQUALBADUPLEV

Trigger Threshold

ULQUALBADTRIG

AMRULQUALBADTRIG

DLQUALBADUPLEV

AMRDLQUALBADUPLEV

DLQUALBADTRIG

AMRDLQUALBADTRIG

Downlink Threshold offset Trigger Threshold

No power control is conducted when the receive level is greater than UL/DL RX_LEV Upper Threshold or AMR UL/DL RX_LEV Upper Threshold and receive quality is lower than UL/DL Qual Lower Threshold or AMR UL/DL Qual. Lower Threshold. In this case, the areas without the need for power control can be minimized by setting the UL/DL Qual. Bad Trig Threshold or AMR UL/DL Qual. Bad Trig Threshold. The UL/DL Qual. Bad Trig Threshold or AMR UL/DL Qual. Bad Trig Threshold increases the signal strength upper threshold when the receive quality is poor. The parameters UL/DL Qual. Bad UpLEVDiff and AMR UL/DL Qual. Bad UpLEVDiff are used to increase the signal quality upper threshold scale when the receive quality is poor.

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Table 4-14 Bad quality threshold improvement parameters Parameter ID

Value Range

Recommended Value

ULQUALBADTRIG

0 to 7

3

ULQUALBADUPLEV

0 to 63

5

DLQUALBADTRIG

0 to 7

2

DLQUALBADUPLEV

0 to 63

10

AMRULQUALBADTRIG

0 to 7

3

AMRULQUALBADUPLEV

0 to 63

6

AMRDLQUALBADTRIG

0 to 7

2

AMRDLQUALBADUPLEV

0 to 63

8

Table 4-15 Maximum adjustment step parameters Parameter ID

Value Range

Recommended Value

MAXADJPCVAL

0 to 32

8

AMRMAXVALADJRX

0 to 32

8

MAXSTEP0

0 to 30

2

MAXSTEP1

0 to 30

0

MAXSTEP2

0 to 30

0

QUALSTEP

0 to 4

2

AMRMAXADJPCVAL

0 to 32

8

AMRMAXVALADJRX

0 to 32

8

AMRMAXSTEP0

0 to 30

2

AMRMAXSTEP1

0 to 30

0

AMRMAXSTEP2

0 to 30

0

AMRQUALSTEP

0 to 4

4

4.3.4 Huawei III Power Control Parameters 1.

Function Activation When PWRCTRLSW is set to PWR3, Huawei III Power Control algorithm is activated. Huawei recommends the Optimized Huawei III Power Control algorithm. The UPPCEN and DNPCEN whether to allow power control for uplink and downlink. To enable Huawei III power control algorithm for AMR calls, PWRCTRLSW must set as PWR3 and AMRCALLPCALLOWED must set as ON.

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To enable Huawei III power control algorithm for AMR calls, PWRCTRLSW must set as PWR3 and NONAMRCALLPCALLOWED must set as ON. Table 4-16 Function activation parameters Parameter ID

Value Range

Recommended Value

PWRCTRLSW


PWR3

UPPCEN

NO, YES

YES

DNPCEN

NO, YES

YES

AMRCALLPCALLOWED

OFF (Not Allowed), ON (Allowed)

ON

NONAMRCALLPCALLOWED

OFF (Not Allowed), ON (Allowed)

ON

2.

0.2dB Power Control Parameter FINESTEPPCALLOWED activates 0.2 dB downlink power control. This power control function improves the power control precision.

Table 4-17 Function activation parameter for 0.2dB Power Control Parameter ID

Value Range

Recommended Value

FINESTEPPCALLOWED

NO, YES

NO

3.

Period Control ULADJPRD and DLADJPRD control the minimum interval between two consecutive uplink power control commands. If the value of this parameter is decreased, the reaction speed of power control accelerates, but the signaling traffic on the Abis interface increases.

Table 4-18 Period control parameters Parameter ID

Value Range

Recommended Value

ULADJPRD

0 to 255

3

DLADJPRD

0 to 255

3

4.

MR interpolation If MRs are discarded when being transmitted over links, the PCIII algorithm interpolates new MRs using an algorithm based on the worst estimation to compensate for discarded MRs. If excessive MRs are discarded, interpolated MRs cannot accurately reflect the radio environment. When the number of discarded MRs exceeds a threshold, the power control process is re-initialized.

Table 4-19 Interpolation parameters Parameter ID

Value Range

Recommended Value

MRMISSNUM

1 to 255

5

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MR compensation N/A

6.

Discarding of MRs in the initial phase of connection The MRs generated in the initial phase of connection must be discarded because of their low accuracy. The discarded MRs do not participate in filtering. The following parameters specify the number of MRs discarded from the SDCCH and TCH the initial phase of connection.

Table 4-20 Initial stabilization period parameters Parameter ID

Value Range

Recommended Value

SDMRCUTNUM

0 to 5

1

TCHMRCUTNUM

0 to 10

3

7.

MR filtering The PCIII algorithm uses exponential filtering and sliding window filtering algorithms. Exponential filtering is performed on MRs before sliding window filtering. The exponential filtering algorithm has the following characteristics: The longer the filtering algorithm is, the more stable power control is, but the slower the power control response is. In high-density urban scenarios, the length of the exponential filtering algorithm should be reduced to ensure a more positive response to door slam and corner scenarios.

Table 4-21 Filtering parameters for exponential filtering algorithm Parameter ID

Value Range

Recommended Value High

Urban Rural

DLREXLEVEXPFLTLEN

0 to 19

3

3

3

DLREXQUALEXPFLTLEN

0 to 19

3

3

3

ULREXLEVEXPFLTLEN

0 to 19

3

3

3

ULREXQUALEXPFLTLEN

0 to 19

3

3

3

The total effect of the filter in PCIII is determined by the sliding window and exponential components. Using a heavy filter length for both components will result in very heavy filtering which will degrade the performance of power control. The recommended tuning is to use a moderate filter length for the exponential component and set the sliding window to 1 (which effectively disables the sliding window filter). Table 4-22 Filtering parameters for sliding window filtering algorithm Parameter ID

Value Range

Recommended Value

DLREXLEVSLDWINDOW

1 to 20

1

DLREXQUALSLDWINDOW

1 to 20

1

ULREXLEVSLDWINDOW

1 to 20

1

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ULREXQUALSLDWINDOW

8.

1 to 20

1

Core Algorithm

Algorithm summary The PCIII algorithm calculates the power control step based on two aspects: RX level and RX quality. The level factor and quality factor are used to control the balance between level adjustment and quality adjustment. The level threshold and quality threshold are used to control the step of level and quality adjustment. Table 4-23 Classification of the PCIII algorithm parameters (uplink) Factor or Threshold

Normal Call

AMR Call

Level Factor

ULREXLEVADJFCTR

Quality Factor

ULREXQUALADJFCTR

Upper threshold

ULFSREXQUALHIG ULAFSREXQUALHIGHTHR HTHRED ED ULHSREXQUALHIG ULAHSREXQUALHIGHTHR HTHRED ED

Lower threshold

ULFSREXQUALLOW ULAFSREXQUALLOWTHR THRED ED ULHSREXQUALLO ULAHSREXQUALLOWTHR WTHRED ED

Upper threshold

ULREXLEVHIGHTHR N/A ED

Lower threshold

ULREXLEVLOWTHR N/A ED

Table 4-24 Classification of the PCIII algorithm parameters (downlink) Factor or Threshold

Normal Call

AMR Call

Level Factor

DLREXLEVADJFCTR

Quality Factor

DLREXQUALADJFCTR

Upper threshold

DLFSREXQUALHIG DLAFSREXQUALHIGHTHR HTHRED ED DLHSREXQUALHIG DLAHSREXQUALHIGHTHR HTHRED ED

Lower threshold

DLFSREXQUALLOW DLAFSREXQUALLOWTHR THRED ED DLHSREXQUALLO DLAHSREXQUALLOWTHR WTHRED ED

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Factor or Threshold

Normal Call

AMR Call

Upper threshold

DLREXLEVHIGHTHR N/A ED

Lower threshold

DLREXLEVLOWTHR N/A ED

Key issues for parameter setting 

The relationships between the level factor and the quality factor Value comparison between the quality factor and the level factor Since fluctuation of RX quality is usually smaller than fluctuation of the RX level, the quality factor is usually set to a value bigger than the level factor, which increases quality change caused by power control to balance the quality adjustment and level adjustment. The sum of the quality factor and level factor is not always 1. If the sum is significantly greater than 1 this can lead to instability in the power control algorithm. Power control amplitude is also determined by the sum of the quality factor and level factor, which can be increased to reduce the power consumption when signals are of high level and quality.



Different quality thresholds between different voice codec algorithms Calls using different voice codec algorithms can be configured with different power control quality thresholds since the decoding capability varies with the different voice codec algorithms. Calls using an algorithm (for example AMR FR) with a high decoding capability can be configured with an RX quality threshold lower than the calls using an algorithm (for example HR) with a low decoding capability. This ensures satisfaction of users performing HR calls and moderately reduces the voice quality of AMR FR calls. Network interference is decreased in this way.



Comparison between dual thresholds and a single threshold The PCIII algorithm uses a single threshold, numerically equal to the median of the upper and lower threshold parameters. It is recommended that the upper and lower thresholds be set to the same value.



Adjustment strategies for different scenarios − Scenarios

with high interference

In scenarios with high interference (for example urban areas), the quality factor can be increased and the RX level threshold can be decreased moderately. − Scenarios

with a challenge in providing necessary coverage

In scenarios where the coverage is insufficient, the level factor and RX level threshold can be increased moderately. − High-density

urban scenarios

High-density scenarios require faster response to changing conditions especially when increasing transmission power in response to measured poor quality. The filter can be set to a shorted length, also it can be useful to increase the thresholds moderately to increase the link margin. Parameter tuning and scenarios The PCIII algorithm is mainly concerned with the following parameters: RX quality threshold (varies by service type), RX level threshold, quality factor, and level factor. It also takes into account other

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parameters for example the filtering algorithm length and adjustment factors, which are usually set to default values. The parameters which are different in the various scenarios shown here are emphasized. Table 4-25 Parameter baseline for PCIII core algorithm Parameter ID

Suburban Scenario

Urban Dense-Urban Scenario Scenario

High-Speed Scenario

DLREXLEVADJFCTR

4

3

3

3

DLREXQUALADJFCTR

6

6

6

6

DLREXLEVHIGHTHRED

22

20

18

25

DLREXLEVLOWTHRED

22

20

18

25

DLFSREXQUALHIGHTHRED

16

16

16

18

DLFSREXQUALLOWTHRED

16

16

16

18

DLHSREXQUALHIGHTHRED

18

18

18

20

DLHSREXQUALLOWTHRED

18

18

18

20

DLAFSREXQUALHIGHTHRED 14

14

14

16

DLAFSREXQUALLOWTHRED 14

14

14

16

DLAHSREXQUALHIGHTHRED 16

16

16

18

DLAHSREXQUALLOWTHRED 16

16

16

18

DLMAXDOWNSTEP

6

6

6

6

DLMAXUPSTEP

8

8

8

8

DLREXLEVEXPFLTLEN

3

3

3

3

DLREXQUALEXPFLTLEN

3

3

3

3

ULREXLEVEXPFLTLEN

3

3

3

3

ULREXQUALEXPFLTLEN

3

3

3

3

ULREXLEVSLDWINDOW

1

1

1

1

ULREXQUALSLDWINDOW

1

1

1

1

DLREXLEVSLDWINDOW

1

1

1

1

DLREXQUALSLDWINDOW

1

1

1

1

ULREXLEVADJFCTR

4

3

3

3

ULREXQUALADJFCTR

6

6

6

6

ULREXLEVHIGHTHRED

20

18

16

23

ULREXLEVLOWTHRED

20

18

16

23

ULFSREXQUALHIGHTHRED

16

16

16

18

ULFSREXQUALLOWTHRED

16

16

16

18

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Parameter ID

Suburban Scenario

Urban Dense-Urban Scenario Scenario

High-Speed Scenario

ULHSREXQUALHIGHTHRED

18

18

18

20

ULHSREXQUALLOWTHRED

18

18

18

20

ULAFSREXQUALHIGHTHRED 14

14

14

16

ULAFSREXQUALLOWTHRED 14

14

14

16

ULAHSREXQUALHIGHTHRED 16

16

16

18

ULAHSREXQUALLOWTHRED 16

16

16

18

ULMAXDOWNSTEP

6

6

6

6

ULMAXUPSTEP

8

8

8

8

4.3.5 Optimized Huawei III Power Control Parameters Optimized Huawei III Power Control algorithm is basically the same as the PCIII algorithm in procedures such as MR processing, filtering, calculation of power control step, and power control execution. The optimization of PCIII algorithm is achieved from the following aspects: 

The receive level and receive quality are compensated for the power control.



In the PCIII Opt. algorithm, measurements are filtered in exponential non-linear filters in order to eliminate variations of temporary disturbances.



In the PCIII Opt. algorithm, the calculation of power control step adopts dual factors to protect the areas with weak level.



The formula for calculating the power control step is optimized.

1.

Function Activation

Huawei III power control optimized algorithm takes effect when PWRCTRLSW is set to PWR3 and PWRCTRLOPTIMIZEDEN is set to YES. Table 4-26 Parameters baseline for PCIII core algorithm Parameter ID

Value Range

Recommended Value

PWRCTRLSW


PWR3

AMRCALLPCALLOWED

OFF(Not Allowed), ON(Allowed) ON

NONAMRCALLPCALLOWED

OFF(Not Allowed), ON(Allowed) ON

UPPCEN

[No,Yes]

Yes

DNPCEN

[No,Yes]

Yes

PWRCTRLOPTIMIZEDEN

NO(No), YES(Yes)

YES

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Core Algorithm

The parameter system of the PCIII Opt. algorithm The Optimized Huawei III Power Control Algorithm is mostly the same as the PCIII algorithm in theory and parameters. So the PCIII Opt. algorithm has the same parameters as PCIII plus some new parameters. Table 4-27 Parameters baseline for PCIII Opt. core algorithm Parameter ID

High

Urban

Rural

DLREXLEVADJFCTR

3

3

3

DLREXQUALADJFCTR

4

4

4

DLREXLEVHIGHTHRED

20

22

25

DLREXLEVLOWTHRED

20

22

25


18

18

18

DLFSREXQUALLOWTHRED

18

18

18

DLHSREXQUALHIGHTHRED

17

17

17

DLHSREXQUALLOWTHRED

17

17

17

DLAFSREXQUALHIGHTHRED

18

18

18

DLAFSREXQUALLOWTHRED

18

18

18

DLAHSREXQUALHIGHTHRED

18

18

18

DLAHSREXQUALLOWTHRED

18

18

18

DLMAXDOWNSTEP

30

30

30

DLMAXUPSTEP

30

30

30

ULREXLEVADJFCTR

3

3

3

ULREXQUALADJFCTR

4

4

4

ULREXLEVHIGHTHRED

20

22

25

ULREXLEVLOWTHRED

20

22

25


16

16

16

ULFSREXQUALLOWTHRED

16

16

16

ULHSREXQUALHIGHTHRED

16

16

16

ULHSREXQUALLOWTHRED

16

16

16

ULAFSREXQUALHIGHTHRED

15

15

15

ULAFSREXQUALLOWTHRED

15

15

15

ULAHSREXQUALHIGHTHRED

16

16

16

ULAHSREXQUALLOWTHRED

16

16

16

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Parameter ID

High

Urban

Rural

ULMAXDOWNSTEP

30

30

30

ULMAXUPSTEP

30

30

30

ULFILTADJFACTOR

3

3

3

DLFILTADJFACTOR

3

3

3

ULRXLEVPROTECTFACTOR

30

30

30

ULRXQUALPROTECTFACTOR

75

75

75

DLRXLEVPROTECTFACTOR

20

20

20

DLRXQUALPROTECTFACTOR

60

60

60

4.3.6 Active Power Control Parameters 1.

Function activation

If PWRBCDALLOWD is set to YES, then during the initial access assignment or intra-BSC handover, the power forecast is performed when the traffic channels are activated. The forecast initial power is sent to the BTS through the channel activation message, which enables the MS and BTS to transmit with appropriate power. Otherwise, the power forecast is not performed and the MS and BTS transmit with maximum power. Table 4-28 Function activation parameters of active power control Parameter ID

Value Range

Recommended Value

PWRBCDALLOWD

NO, YES

NO

UPPCEN

NO, YES

YES

DNPCEN

NO, YES

YES

2.

Core Algorithm

Table 4-29 Key parameters for active power control algorithm Parameter ID

Value Range

Recommended Value

COMBINERLOSS

0 to 100

45

DOUBLEANTENNAGAIN

0 to 255

30

PATHLOSS

0 to 255

79

EXPDLRXLEV

0 to 63

30

EXPULRXLEV

0 to 63

30

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4.3.7 SAIC Power Control Parameters 1.

Function Activation

The setting of parameter SAICALLOWED determines whether an MS supports the SAIC function. Single Antenna Interference Cancellation (SAIC) is used to reduce the impact of interference on the reception of downlink signals through a signal processing technology. An MS enabled with SAIC has improved ability of anti-interference. After SAIC is enabled, the thresholds for BTS/MS Power Control are adjusted to improve the radio performance of the BSS. Table 4-30 Function activation parameters of SAIC power control Parameter ID

Value Range

Recommended Value

SAICALLOWED

NO, YES

YES

2.

Core Algorithm

Table 4-31 Key parameters for SAIC power control algorithm Parameter ID SAICTHREDAPDTVALUE BTSSAICPCADJSWITCH SAICTHREDAPDTVALUE

Value Range

Recommended Value Remark

0 to 2

1

This parameter is used in power control algorithm II.

OFF, ON

OFF

-

0 to 4

3

This parameter is used in power control algorithm III.

4.4 Little Used Parameters The following parameters are provided to allow system flexibility. It is recommended that operators use the default values under normal conditions. 

AMRSADLUPGRADE



ULPREDLEND



DLPREDLEND



AMRULPREDLEND



AMRDLPREDLEND



BTSPWRNUM



AMRBTSPWRNUM

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5 Parameters Table 5-1 Parameter description Parameter ID

NE

MML Command

AMRBTSPWRNUM

BSC6900 SET GCELLPWR2(Optional)

Description Meaning: Maximum degree by which the BSC can control the power of the AMR BTS dynamically GUI Value Range: 1~16 Actual Value Range: 2~32 Default Value: 16

AMRCALLPCALLOWED


Meaning: Whether to enable the III power control algorithm for AMR calls. If enabled, power control is performed on AMR calls. GUI Value Range: OFF(Not Allowed), ON(Allowed) Actual Value Range: OFF, ON Default Value: ON

AMRDLLEVFTLEN


Meaning: Number of measurement reports sampled for averaging downlink AMR signal strength. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to average the measured values in several successive measurement reports to reflect the radio environment. GUI Value Range: 1~20 Actual Value Range: TCH:480~9600, step:480; SDCCH:470~9400, step:470 Default Value: 5

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AMRDLPREDLEND

6 Counters


Meaning: Number of downlink AMR measurement reports that the BSC predicts. The BSC takes a while to confirm the power control effect of a power control command. Thus, the BSC makes a power control decision based on a measurement report that lags behind the changes in the receive level and quality instead of reflecting the real-time radio environment. As a result, the power control is late. To prevent late power control to a certain degree, the power control algorithm involves a measurement report prediction filter. The BSC can sample several downlink measurement reports in a short time and filter them according to a specific weight to predict future N measurement reports. This parameter specifies the number N. GUI Value Range: 0~3 Actual Value Range: 0~3 Default Value: 0

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AMRDLQHTHRED

6 Counters


Meaning: Quality level threshold for decreasing downlink AMR signal power. If the BTS transmits AMR signals at a quality level less than "AMR DL Qual. Upper Threshold", the BSC decreases the power of the BTS. If (downlink receive level "AMR MAX Down Adj. PC Value by Qual.") < "AMR DL RX_LEV Lower Threshold", the BSC does not adjust the transmit power. GUI Value Range: 0~7 Actual Value Range: 0~7 Default Value: 0

AMRDLQLTHRED


Meaning: Quality level threshold for increasing downlink AMR signal power. If the BTS transmits AMR signals at a quality level greater than "AMR DL Qual. Lower Threshold", the BSC increases the power of the BTS. If (downlink receive level + "AMR MAX Up Adj. PC Value by Qual.") > "AMR DL RX_LEV Upper Threshold", the BSC does not adjust the transmit power. GUI Value Range: 0~7 Actual Value Range: 0~7 Default Value: 3

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AMRDLQUAFTLEN

6 Counters


Meaning: Number of measurement reports sampled for averaging downlink AMR signal quality. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to average the measured values in several successive measurement reports to reflect the radio environment. GUI Value Range: 1~20 Actual Value Range: TCH:480~9600, step:480; SDCCH:470~9400, step:470 Default Value: 5

AMRDLQUALBADTRIG


Meaning: During downlink power control, if the downlink receive quality level is equal to or greater than this threshold, "AMR DL RX_LEV Upper Threshold" is increased by "AMR DL Qual Bad UpLEVDiff" to further increase the expected downlink power level. GUI Value Range: 0~7 Actual Value Range: 0~7 Default Value: 2

AMRDLQUALBADUPLEV


Meaning: During downlink power control, if the downlink receive quality level is equal to or greater than "AMR DL Qual Bad Trig Threshold", "AMR DL RX_LEV Upper Threshold" is increased by "AMR DL Qual Bad UpLEVDiff" to further increase the expected downlink power level. GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 8

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AMRDLSSHTHRED

6 Counters


Meaning: Upper threshold for downlink AMR signal strength. If the downlink received AMR signal level is greater than this threshold, a power decrease is computed. Then, the power is decreased by the least of the power decrease, maximum power adjustment step allowed by the quality zone to which the received signal quality belongs, and "AMR MAX Down Adj. PC Value by Qual.". Power decrease = downlink received signal level - ("AMR DL RX_LEV Upper Threshold" + "AMR DL RX_LEV Lower Threshold")/2 The maximum power adjustment step allowed by the quality zone is chosen from "AMR MAX Down Adj. Value Qual. Zone 0", "AMR MAX Down Adj. Value Qual. Zone 1", and "AMR MAX Down Adj. Value Qual. Zone 2" according to the quality zone. GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 33

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AMRDLSSLTHRED

6 Counters


Meaning: Lower threshold for downlink AMR signal strength. If the downlink received AMR signal level is less than this threshold, a power increase is computed. Then, the power is increased by the least of the power increase, "AMR MAX Up Adj. PC Value by RX_LEV", and "AMR MAX Up Adj. PC Value by Qual.". Power increase = ("AMR DL RX_LEV Upper Threshold" + "AMR DL RX_LEV Lower Threshold")/2 - downlink received signal level. GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 25

AMRMAXADJPCVAL


Meaning: Maximum step by which the power can be increased according to received signal quality GUI Value Range: 0~32 Actual Value Range: 0~32 Default Value: 8

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AMRMAXSTEP0

6 Counters


Meaning: Maximum step by which the power can be decreased when the received signal quality belongs to quality zone 0. Huawei power control algorithm generation II classifies the received signal quality into three quality zones. The maximum step by which the power can be decreased according to signal level varies according to the quality zones. GUI Value Range: 0~30 Actual Value Range: 0~30 Default Value: 2

AMRMAXSTEP1



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AMRMAXSTEP2

6 Counters



AMRMAXVALADJRX


Meaning: Maximum step by which the power can be increased according to received signal level GUI Value Range: 0~32 Actual Value Range: 0~32 Default Value: 8

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AMRMRCOMPREG

6 Counters


Meaning: Whether to enable the compensation of AMR measurement reports in Huawei power control algorithm generation II If this parameter is set to YES, Huawei power control algorithm generation II puts a currently received measurement report into the measurement report compensation queue. Then, the algorithm records the change in the transmit power based on the MS/BTS power in the measurement report. According to the power change, the algorithm compensates the received signal level in a history measurement report after measurement report interpolation. Before making a power control decision, the BSC samples and weights the received signal level and quality in several history measurement reports. The MS/BTS transmit power may vary over these measurement reports. To ensure the accuracy of the received signal level and quality to be weighted, the power control algorithm needs to compensate the received signal level and quality in the history measurement reports where the transmit power differs from the current transmit power. GUI Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: YES

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AMRPCADJPERIOD

6 Counters


Meaning: Minimum interval between two consecutive AMR power control commands GUI Value Range: 1~15 Actual Value Range: 480~7200 Default Value: 3

AMRQUALSTEP


Meaning: Maximum step by which the power can be decreased according to received signal quality GUI Value Range: 0~4 Actual Value Range: 0~4 Default Value: 4

AMRSADLUPGRADE

BSC6900 SET GCELLPWRBASIC(Optional)

Meaning: Number of levels by which the BTS increases the power of an SACCH frame. This parameter is used for SACCH power control. When sending an SACCH frame, the BTS increases the power of the SACCH frame by this specified number of levels. GUI Value Range: 0~15 Actual Value Range: 0~15 Default Value: 0

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AMRULLEVFTLEN

6 Counters


Meaning: Number of measurement reports sampled for averaging uplink AMR signal strength. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to average the measured values in several successive measurement reports to reflect the radio environment. GUI Value Range: 1~20 Actual Value Range: TCH:480~9600, step:480; SDCCH:470~9400, step:470 Default Value: 5

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AMRULPREDLEND

6 Counters


Meaning: Number of uplink AMR measurement reports that the BSC predicts. The BSC takes a while to confirm the power control effect of a power control command. Thus, the BSC makes a power control decision based on a measurement report that lags behind the changes in the receive level and quality instead of reflecting the real-time radio environment. As a result, the power control is late. To prevent late power control to a certain degree, the power control algorithm involves a measurement report prediction filter. The BSC can sample several downlink measurement reports in a short time and then weigh them to predict future N measurement reports. This parameter specifies the number N. GUI Value Range: 0~3 Actual Value Range: 0~3 Default Value: 0

AMRULQHTHRED


Meaning: Quality level threshold for decreasing the power of an uplink AMR call. If the MS transmits AMR signals at a quality level less than "AMR ULQual. Upper Threshold", the BTS decreases the power of the MS. If (uplink receive level - "AMR MAX Down Adj. PC Value by Qual.") < "AMR UL RX_LEV Lower Threshold", the BTS does not adjust the transmit power. GUI Value Range: 0~7 Actual Value Range: 0~7 Default Value: 0

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AMRULQLOWTHRED

6 Counters


Meaning: Quality level threshold for increasing the power of an uplink AMR call. If the MS transmits AMR signals at a quality level greater than "AMR UL Qual. Lower Threshold", the BTS increases the power of the MS. If (uplink receive level + "AMR MAX Up Adj. PC Value by Qual.") > "AMR UL RX_LEV Upper Threshold", the BTS does not adjust the transmit power. GUI Value Range: 0~7 Actual Value Range: 0~7 Default Value: 3

AMRULQUAFTLEN


Meaning: Number of measurement reports sampled for averaging uplink AMR signal quality. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to average the measured values in several successive measurement reports to reflect the radio environment. GUI Value Range: 1~20 Actual Value Range: TCH:480~9600, step:480; SDCCH:470~9400, step:470 Default Value: 5

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AMRULQUALBADTRIG

6 Counters


Meaning: During uplink power control, if the uplink receive quality level is equal to or greater than this threshold, "AMR UL RX_LEV Upper Threshold" is increased by "AMR UL Qual. Bad UpLEVDiff" to further increase the expected uplink power level. GUI Value Range: 0~7 Actual Value Range: 0~7 Default Value: 3

AMRULQUALBADUPLEV


Meaning: During uplink power control, if the uplink receive quality level is equal to or greater than "AMR UL Qual. Bad Trig Threshold", "AMR UL RX_LEV Upper Threshold" is increased by "AMR UL Qual. Bad UpLEVDiff" to further increase the expected uplink power level. GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 6

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AMRULSSHTHRED

6 Counters


Meaning: Upper threshold for uplink AMR signal strength If the uplink received AMR signal level is greater than this threshold, a power decrease is computed. Then, the power is decreased by the least of the power decrease, maximum power adjustment step allowed by the quality zone to which the received signal quality belongs, and "AMR MAX Down Adj. PC Value by Qual.". Power decrease = uplink received signal level ("AMR UL RX_LEV Upper Threshold" + "AMR UL RX_LEV Lower Threshold")/2 The maximum power adjustment step allowed by the quality zone is chosen from "AMR MAX Down Adj. Value Qual. Zone 0", "AMR MAX Down Adj. Value Qual. Zone 1", and "AMR MAX Down Adj. Value Qual. Zone 2" according to the quality zone. GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 30

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AMRULSSLTHRED

6 Counters


Meaning: Lower threshold for uplink AMR signal strength. If the uplink received AMR signal level is less than this threshold, a power increase is computed. Then, the power is increased by the least of the power increase, "AMR MAX Up Adj. PC Value by RX_LEV", and "AMR MAX Up Adj. PC Value by Qual.". Power increase = ("AMR UL RX_LEV Upper Threshold" + "AMR UL RX_LEV Lower Threshold")/2 - uplink received signal level. GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 18

BSMSPWRLEV

BSC6900 SET GCELLHOCTRL(Optional) Meaning: Whether to enable the BTS to transfer BTS/MS power class to the BSC GUI Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: YES

BTSMESRPTPREPROC

BSC6900 SET GCELLHOCTRL(Optional) Meaning: Whether to enable the BTS to preprocess measurement reports. This parameter determines where to conduct power control. GUI Value Range: BSC_Preprocessing(BSC preprocessing), BTS_Preprocessing(BTS preprocessing) Actual Value Range: BSC_Preprocessing, BTS_Preprocessing Default Value: BSC_Preprocessing

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BTSPWRNUM

6 Counters


Meaning: Maximum degree by which the BSC can control the power of the BTS dynamically GUI Value Range: 1~16 Actual Value Range: 2~32 Default Value: 16

BTSSAICPCADJSWITCH

BSC6900 SET GCELLSOFT(Optional)

Meaning: Whether to specify "Power Control threshold Adjust for SAIC" in the MML command "SET GCELLPWR2" GUI Value Range: OFF(Off), ON(On) Actual Value Range: OFF, ON Default Value: OFF

CANPC

BSC6900 SET GCELLCCCH(Optional)

Meaning: Whether an MS uses the calculated value as the final receive level value. The calculated receive level value is the measured receive level value minus the receive level value obtained from the BCCH TRX timeslots. This parameter is a cell option in system messages 3 and 6. GUI Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: YES

COMBINERLOSS


Meaning: Combined loss used to estimate the downlink power during assignment GUI Value Range: 0~100 Actual Value Range: 0~10 Default Value: 45

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DLADJPRD

6 Counters


Meaning: Minimum interval between two consecutive downlink power control commands. GUI Value Range: 0~255 Actual Value Range: TCH:480~122400, step:480; SDCCH:470~119850, step:470 Default Value: 3

DLAFSREXQUALHIGHTHRED BSC6900 SET GCELLPWR3(Optional)

Meaning: If the downlink receive quality level of an AMR full rate call is greater than this parameter, the call needs to undergo Huawei power control generation III. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 14

DLAFSREXQUALLOWTHRED BSC6900 SET GCELLPWR3(Optional)

Meaning: If the downlink receive quality level of an AMR full rate call is smaller than this parameter, the call needs to undergo Huawei power control generation III. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 14

DLAHSREXQUALHIGHTHRED BSC6900 SET GCELLPWR3(Optional)

Meaning: If the downlink receive quality level of an AMR half rate call is greater than this parameter, the call needs to undergo Huawei power control generation III. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 16

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DLAHSREXQUALLOWTHRED BSC6900 SET GCELLPWR3(Optional)

Meaning: If the downlink receive quality level of an AMR half rate call is smaller than this parameter, the call needs to undergo Huawei power control generation III. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 16

DLFILTADJFACTOR


Meaning: Filter adjustment factor for downlink power control. Setting this parameter high helps to smooth the filtered values and to reduce the impact of poor measurement reports on the filtered values. Setting this parameter low helps to draw the filtered values close to the actual values and to heighten the power control effect. GUI Value Range: 1~10 Actual Value Range: 1~10 Default Value: 3



Meaning: Upper quality threshold for Huawei power control generation III on a full rate call. If the downlink receive quality level of a full rate call is greater than this threshold, the call needs to undergo Huawei power control generation III. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 16

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DLFSREXQUALLOWTHRED

6 Counters


Meaning: Lower quality threshold for Huawei power control generation III on a full rate call. If the downlink receive quality level of a full rate call is smaller than this threshold, the call needs to undergo Huawei power control generation III. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 16

DLHSREXQUALHIGHTHRED BSC6900 SET GCELLPWR3(Optional)

Meaning: Upper quality threshold for Huawei power control generation III on a half rate call. If the downlink receive quality level of a half rate call is greater than this threshold, the call needs to undergo Huawei power control generation III. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 18

DLHSREXQUALLOWTHRED


Meaning: Lower quality threshold for Huawei power control generation III on a half rate call. If the downlink receive quality level of a half rate call is smaller than this threshold, the call needs to undergo Huawei power control generation III. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 18

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DLLEVFILTLEN

6 Counters


Meaning: Number of measurement reports sampled for averaging downlink signal strength. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to average the measured values in several successive measurement reports to reflect the radio environment. GUI Value Range: 1~20 Actual Value Range: TCH:480~9600, step:480; SDCCH:470~9400, step:470 Default Value: 5

DLMAXDOWNSTEP


Meaning: Maximum step by which to decrease downlink power according to signal strength. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 4

DLMAXUPSTEP


Meaning: Maximum step by which to increase downlink power according to signal strength. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 8

Issue 01 (2011-03-31)


5-21


DLPREDLEND

6 Counters


Meaning: Number of downlink measurement reports that the BSC predicts. The BSC takes a while to confirm the power control effect of a power control command. Thus, the BSC makes a power control decision based on a measurement report that lags behind the changes in the receive level and quality instead of reflecting the real-time radio environment. As a result, the power control is late. To prevent late power control to a certain degree, the power control algorithm involves a measurement report prediction filter. The BSC can sample several downlink measurement reports in a short time and then weigh them to predict future N measurement reports. This parameter specifies the number N. GUI Value Range: 0~3 Actual Value Range: 0~3 Default Value: 0

DLQHIGHTHRED


Meaning: Quality level threshold for decreasing downlink signal power. If the BTS transmits signals at a quality level less than this threshold, the BSC decreases the power of the BTS. If (downlink receive level - "MAX Down Adj. PC Value by Qual.") < "DL RX_LEV Lower Threshold", the BSC does not adjust the transmit power. GUI Value Range: 0~7 Actual Value Range: 0~7 Default Value: 0

Issue 01 (2011-03-31)


5-22


DLQLOWTHRED

6 Counters


Meaning: Quality level threshold for increasing downlink signal power. If the BTS transmits signals at a quality level greater than this threshold, the BSC increases the power of the BTS. If (downlink receive level + "MAX Up Adj. PC Value by Qual.") > "DL RX_LEV Upper Threshold", the BSC does not adjust the transmit power. GUI Value Range: 0~7 Actual Value Range: 0~7 Default Value: 2

DLQUAFILTLEN


Meaning: Number of measurement reports sampled for averaging downlink signal quality. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to average the measured values in several successive measurement reports to reflect the radio environment. GUI Value Range: 1~20 Actual Value Range: TCH:480~9600, step:480; SDCCH:470~9400, step:470 Default Value: 5

Issue 01 (2011-03-31)


5-23


DLQUALBADTRIG

6 Counters


Meaning: During downlink power control, if the downlink receive quality level is equal to or greater than "DL Qual, bad Trig Threshold", "DL RX_LEV Upper Threshold" is increased by "DL Qual. Bad UpLEVDiff" to further increase the expected downlink power level. GUI Value Range: 0~7 Actual Value Range: 0~7 Default Value: 2

DLQUALBADUPLEV


Meaning: During downlink power control, if the downlink receive quality level is equal to or greater than "DL Qual, bad Trig Threshold", "DL RX_LEV Upper Threshold" is increased by "DL Qual. Bad UpLEVDiff" to further increase the expected downlink power level. GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 10

DLREXLEVADJFCTR


Meaning: This parameter specifies the downlink signal strength factor multiplied by 10 during the calculation of the downlink power control step. The downlink signal strength factor is a coefficient indicating how much the signal strength is considered during the calculation of the downlink power control step. GUI Value Range: 0~10 Actual Value Range: 0~10 Default Value: 3

Issue 01 (2011-03-31)


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DLREXLEVEXPFLTLEN

6 Counters


Meaning: Length of the exponential filter for downlink signal strength. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to filter the measured values in several successive measurement reports to reflect the radio environment. GUI Value Range: 0~19 Actual Value Range: TCH:0~9120, step:480; SDCCH:0~8930, step:470 Default Value: 3

DLREXLEVHIGHTHRED


Meaning: Upper receive level threshold for downlink power control. If the downlink receive level is greater than this threshold, the power of the downlink signal needs to be decreased. GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 20

DLREXLEVLOWTHRED


Meaning: Lower receive level threshold for downlink power control. If the downlink receive level is smaller than this threshold, the power of the uplink signal needs to be increased. GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 20

Issue 01 (2011-03-31)


5-25


DLREXLEVSLDWINDOW

6 Counters


Meaning: Length of the slide window filter for downlink signal strength. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to filter the measured values in several successive measurement reports to reflect the radio environment. GUI Value Range: 1~20 Actual Value Range: TCH:480~9600, step:480; SDCCH:470~9400, step:470 Default Value: 1

DLREXQUALADJFCTR


Meaning: This parameter specifies the downlink quality level factor multiplied by 10 during the calculation of the downlink power control step. The downlink quality level factor is a coefficient indicating how much the quality level is considered during the calculation of the downlink power control step. GUI Value Range: 0~10 Actual Value Range: 0~10 Default Value: 6

Issue 01 (2011-03-31)


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DLREXQUALEXPFLTLEN

6 Counters


Meaning: Length of the exponential filter for downlink signal quality. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to filter the measured values in several successive measurement reports to reflect the radio environment. GUI Value Range: 0~19 Actual Value Range: TCH:0~9120, step:480; SDCCH:0~8930, step:470 Default Value: 3

DLREXQUALSLDWINDOW


Meaning: Length of the slide window filter for downlink signal quality. A single measurement report may not reflect the actual network situations accurately. Therefore, the BSC needs to filter the measured values in several successive measurement reports to reflect the radio environment. GUI Value Range: 1~20 Actual Value Range: TCH:480~9600, step:480; SDCCH:470~9400, step:470 Default Value: 1

DLRXLEVPROTECTFACTOR BSC6900 SET GCELLPWR3(Optional)

Meaning: A power control step cannot exceed the step computed according to "III DL RexLev Protect Factor" and "III DL RexQual Protect Factor". GUI Value Range: 0~100 Actual Value Range: 0~100 Default Value: 5

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6 Counters

DLRXQUALPROTECTFACTOR BSC6900 SET GCELLPWR3(Optional)

Meaning: A power control step cannot exceed the step computed according to "III DL RexLev Protect Factor" and "III DL RexQual Protect Factor". GUI Value Range: 0~100 Actual Value Range: 0~100 Default Value: 55

DLSSHIGHTHRED


Meaning: Upper threshold for downlink signal strength If the downlink received signal level is greater than this threshold, a power decrease is computed. Then, the power is decreased by the least of the power decrease, maximum power adjustment step allowed by the quality zone to which the received signal quality belongs, and "MAX Down Adj. PC Value by Qual.". Power decrease = downlink received signal level - ("DL RX_LEV Upper Threshold" + "AMR DL RX_LEV Lower Threshold")/2 The maximum power adjustment step allowed by the quality zone is chosen from "MAX Down Adj.Value Qual.Zone 0", "MAX Down Adj.Value Qual.Zone 1", and "MAX Down Adj.Value Qual.Zone 2" according to the quality zone. GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 45

Issue 01 (2011-03-31)


5-28


DLSSLOWTHRED

6 Counters


Meaning: Lower threshold for downlink signal strength If the downlink received signal level is less than this threshold, a power increase is computed. Then, the power is increased by the least of the power increase, "MAX Up Adj. PC Value by RX_LEV", and "MAX Up Adj. PC Value by Qual.". Power increase = ("DL RX_LEV Upper Threshold" + "AMR DL RX_LEV Lower Threshold")/2 - downlink received signal level GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 28

DNPCEN

BSC6900 SET GCELLBASICPARA(Optional)

Meaning: Whether to allow BTS power control GUI Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: YES

DOUBLEANTENNAGAIN


Meaning: Dual-antenna gain used to estimate the downlink power during assignment GUI Value Range: 0~255 Actual Value Range: 0~25.5 Default Value: 30

EXPDLRXLEV


Meaning: Received signal strength at an MS expected in power forecast, which helps to compute the initial transmit power of the BTS GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 30

Issue 01 (2011-03-31)


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EXPULRXLEV

6 Counters


Meaning: Received signal strength at the BTS expected in power forecast, which helps to compute the initial transmit power of an MS GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 30

FINESTEPPCALLOWED


Meaning: Whether to enable 0.2 dB downlink power control. This power control function improves the power control precision. GUI Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: NO

MAXADJPCVAL


Meaning: Step of upward power adjustment according to the quality of the received signals GUI Value Range: 0~32 Actual Value Range: 0~32 Default Value: 8

MAXSTEP0


Meaning: Huawei power control algorithm II divides three quality zones according to the quality of the receive signals. When the power is downwardly adjusted according to the level, the maximum downward adjustment step can vary according to the quality of the received signals. This parameter specifies the maximum step of downward power adjustment when the quality of the received signals falls into quality zone 0. GUI Value Range: 0~30 Actual Value Range: 0~30 Default Value: 2

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MAXSTEP1

6 Counters



MAXSTEP2



MAXVALADJRX


Meaning: Step of upward power adjustment according to the quality of the received signals GUI Value Range: 0~32 Actual Value Range: 0~32 Default Value: 8

Issue 01 (2011-03-31)


5-31


MEASURETYPE

6 Counters

BSC6900 SET Meaning: Type of the GCELLCCUTRANSYS(Optional) measurement report (MR) reported by the MS GUI Value Range: EnhMeasReport(Enhanced Measurement Report), ComMeasReport(Common Measurement Report) Actual Value Range: EnhMeasReport, ComMeasReport Default Value: ComMeasReport

MRCOMPREG


Meaning: Whether power control algorithm II allows measurement report compensation. When making a power control decision, the BSC retrieves a certain number of history measurement reports and performs weighted filtering on the receive level values and receive quality values in these reports, which may be obtained when different transmit powers were used by BTSs or MSs. To ensure that correct receive level values and receive quality values are used in filtering, you must compensate the receive level values and receive quality values in history measurement reports obtained when transmit powers different than the current one were used. GUI Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: YES

Issue 01 (2011-03-31)


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MRMISSCOUNT

6 Counters

BSC6900 SET GCELLHOFITPEN(Optional)

Meaning: If the number of measurement reports lost consecutively is no larger than this value, linear interpolation is performed for the values in the lost measurement reports based on the values in the two measurement reports preceding and following the lost measurement reports. Otherwise, the lost measurement reports will be discarded, and the value will be recalculated when new measurement reports arrive. GUI Value Range: 0~31 Actual Value Range: 0~31 Default Value: 4

MRMISSNUM


Meaning: When the number of the lost measurement reports exceeds this parameter during a power control period, the power control stops. GUI Value Range: 1~255 Actual Value Range: 1~255 Default Value: 5

MRPREPROCFREQ

BSC6900 SET GCELLHOCTRL(Optional) Meaning: Frequency at which the BTSs submit pre-processed measurement reports to the BSC GUI Value Range: NOreport(Do not report), Twice_ps(Twice every second), Once_ps(Once every second), Once_2s(Once every two second), Once_4s(Once every four second) Actual Value Range: NOreport, Twice_ps, Once_ps, Once_2s, Once_4s Default Value: Once_ps

Issue 01 (2011-03-31)


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NONAMRCALLPCALLOWED

6 Counters


Meaning: Whether to enable the III power control algorithm for Non-AMR calls. If enabled, power control is performed on Non-AMR calls. GUI Value Range: OFF(Not Allowed), ON(Allowed) Actual Value Range: OFF, ON Default Value: ON

PATHLOSS


Meaning: Transmission loss difference between radio frequencies on different bands GUI Value Range: 0~255 Actual Value Range: 0~25.5 Default Value: 79

PCADJPERIOD


Meaning: Minimum interval between two consecutive power control commands GUI Value Range: 1~15 Actual Value Range: TCH:480~7200, step:480; SDCCH:470~7050, step:470 Default Value: 3

PCHOCMPCON

BSC6900 SET GCELLOTHEXT(Optional) Meaning: When the switch is turned on, the compensation method for power control is the same as that for handover. GUI Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: NO

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PRIMMESPPT

6 Counters

BSC6900 SET GCELLHOCTRL(Optional) Meaning: Whether the BTSs send the original measurement reports to the BSC after pre-processing them. When this parameter is set to YES, the BTSs send the original and pre-processed measurement reports to the BSC. GUI Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: NO

PWRBCDALLOWD


Meaning: Whether to allow active power control. If this parameter is set to YES, the system performs power forecast in the process of initial access assignment or service channel activation during intra-BSC handovers, and sends the forecast initial power information to the BTSs through channel activation messages. In this way, the MSs and BTSs can adjust the transmit power. If this parameter is set to NO, the system does not perform power forecast, and the MSs and BTSs choose the maximum transmit power. GUI Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: NO

PWRCTRLOPTIMIZEDEN


Meaning: Whether to enable the optimized power control algorithm III GUI Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: NO

Issue 01 (2011-03-31)


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PWRCTRLSW

6 Counters


Meaning: Whether to enable power control algorithm II or power control algorithm III GUI Value Range: PWR2(Power control II), PWR3(Power controlIII) Actual Value Range: PWR2, PWR3 Default Value: PWR3

QUALSTEP


Meaning: Step of downward power adjustment according to the quality of the received signals GUI Value Range: 0~4 Actual Value Range: 0~4 Default Value: 2

SAICALLOWED


Meaning: Whether an MS supports the SAIC function. Single Antenna Interference Cancellation (SAIC) is used to reduce the impact of interference on the reception of downlink signals through a signal processing technology. An MS enabled with SAIC has improved ability of anti-interference. After SAIC is enabled, the thresholds for BTS/MS Power Control are adjusted to improve the radio performance of the BSS. GUI Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: NO

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SAICTHREDAPDTVALUE

6 Counters


Meaning: Adjustment step of the downlink signal quality threshold in power control algorithm II for MSs that support SAIC. The network side uses a lower downlink signal quality threshold for SAIC-supported MSs in power control, thus lowering the transmit power of the corresponding BTS and reducing the interferences in the whole network. GUI Value Range: 0~2 Actual Value Range: 0~2 Default Value: 1

SAICTHREDAPDTVALUE


Meaning: Adjustment step of the downlink signal quality threshold in power control algorithm III for MSs that support SAIC. The network side uses a lower downlink signal quality threshold for SAIC-supported MSs in power control, thus lowering the transmit power of the corresponding BTS and reducing the interferences in the whole network. GUI Value Range: 0~4 Actual Value Range: 0~4 Default Value: 3

SDMRCUTNUM


Meaning: Maximum number of discarded MRs allowed on the SDCCH in a power control period. GUI Value Range: 0~5 Actual Value Range: 0~5 Default Value: 1

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TCHMRCUTNUM

6 Counters


Meaning: Maximum number of discarded MRs allowed on the TCH in a power control period. GUI Value Range: 0~10 Actual Value Range: 0~10 Default Value: 3

ULADJPRD


Meaning: Minimum interval between two consecutive uplink power control commands. GUI Value Range: 0~255 Actual Value Range: TCH:480~122400, step:480; SDCCH:470~119850, step:470 Default Value: 3

ULAFSREXQUALHIGHTHRED BSC6900 SET GCELLPWR3(Optional)

Meaning: Current call is an AMR full-rate call, and when the uplink receive quality is greater than the threshold, Huawei III power control is performed. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 14

ULAFSREXQUALLOWTHRED BSC6900 SET GCELLPWR3(Optional)

Meaning: Current call is an AMR full-rate call, and when the uplink receive quality is lower than the threshold, Huawei III power control is performed. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 14

ULAHSREXQUALHIGHTHRED BSC6900 SET GCELLPWR3(Optional)

Meaning: Current call is an AMR half-rate call, and when the uplink receive quality is greater than the threshold, Huawei III power control is performed. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 16

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6 Counters

ULAHSREXQUALLOWTHRED BSC6900 SET GCELLPWR3(Optional)

Meaning: Current call is an AMR half-rate call, and when the uplink receive quality is lower than the threshold, Huawei III power control is performed. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 16

ULFILTADJFACTOR


Meaning: Filter adjustment factor for uplink power control. If this parameter is set to a large value, the filtered values become smooth, thus reducing the impact of poor measurement reports on the filtered values. If this parameter is set to a small value, the filter values are close to the actual ones and thus the power control speed is increased. GUI Value Range: 1~10 Actual Value Range: 1~10 Default Value: 3



Meaning: Current call is a full-rate call, and when the uplink receive quality is greater than the threshold, Huawei III power control is performed. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 16

ULFSREXQUALLOWTHRED


Meaning: Current call is a full-rate call, and when the uplink receive quality is lower than the threshold, Huawei III power control is performed. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 16

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6 Counters

ULHSREXQUALHIGHTHRED BSC6900 SET GCELLPWR3(Optional)

Meaning: Current call is a half-rate call, and when the uplink receive quality is greater than the threshold, Huawei III power control is performed. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 18

ULHSREXQUALLOWTHRED


Meaning: Current call is a half-rate call, and when the uplink receive quality is lower than the threshold, Huawei III power control is performed. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 18

ULLEVFILTLEN


Meaning: When the network receives measurement reports, in consideration of the accuracy of a single measurement report, the measurement values in certain measurement reports are filtered to represent the radio operating environment. This parameter specifies the number of measurement reports sampled for filtering the uplink signal strength. GUI Value Range: 1~20 Actual Value Range: TCH:480~9600, step:480; SDCCH:470~9400, step:470 Default Value: 5

ULMAXDOWNSTEP


Meaning: Maximum permissible adjustment step when the BSC decreases the uplink transmit power. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 6

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ULMAXUPSTEP

6 Counters


Meaning: Maximum permissible adjustment step when the BSC increases the uplink transmit power. GUI Value Range: 1~30 Actual Value Range: 1~30 Default Value: 8

ULPREDLEND


Meaning: After the BSC delivers the power control command, it should wait for a certain period before affirming the effect of the power control. Therefore, the MR that power control decision is based on cannot accurately reflect the radio environment during the power adjustment, but misses the latest changes of the receive level and receive quality of the MS. Thus, the power adjustment is delayed. To compensate the delay of power adjustment, the power control algorithm implements the prediction and filtering function. In other words, the BSC samples several uplink measurement reports, performs weighted filtering, and predicts N measurement reports from the current time onwards in a short period. This parameter determines the number of uplink measurement reports predicted by the BSC. In other words, the value of this parameter equals to the previous number N. GUI Value Range: 0~3 Actual Value Range: 0~3 Default Value: 0

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ULQHIGHTHRED

6 Counters


Meaning: The MS transmit power is decreased only when the quality level of the MS transmit signal is smaller than the value of the parameter. If (the uplink receive level - MAX Up Adj. PC Value by Qual) is smaller than "UL RX_LEV Lower Threshold", the MS transmit power is not adjusted. GUI Value Range: 0~7 Actual Value Range: 0~7 Default Value: 0

ULQLOWTHRED


Meaning: The MS transmit power is increased only when the quality level of the MS transmit signal is greater than the value of the parameter. If (the uplink receive level + MAX Up Adj. PC Value by Qual) is greater than "UL RX_LEV Upper Threshold", the MS transmit power is not adjusted. GUI Value Range: 0~7 Actual Value Range: 0~7 Default Value: 3

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ULQUAFILTLEN

6 Counters


Meaning: When the network receives measurement reports, the measurement values in several straight measurement reports are filtered to reflect the radio operating environment for the sake of accuracy. This parameter specifies the number of measurement reports sampled for filtering the uplink signal quality. GUI Value Range: 1~20 Actual Value Range: TCH:480~9600, step:480; SDCCH:470~9400, step:470 Default Value: 5

ULQUALBADTRIG


Meaning: In the case of power control, when the uplink receive quality is not smaller than "UL Qual. Bad Trig Threshold", the actual "UL RX_LEV Upper Threshold" is increased by "UL Qual. Bad UpLEVDiff". GUI Value Range: 0~7 Actual Value Range: 0~7 Default Value: 3

ULQUALBADUPLEV


Meaning: In the case of power control, when the uplink receive quality is not smaller than "UL Qual. Bad Trig Threshold", the actual "UL RX_LEV Upper Threshold" is increased by "UL Qual. Bad UpLEVDiff". GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 5

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ULREXLEVADJFCTR

6 Counters


Meaning: This parameter specifies the uplink signal strength factor multiplied by 10 during the calculation of the uplink power control step. The uplink signal strength factor is a coefficient indicating how much the signal strength is considered during the calculation of the uplink power control step. GUI Value Range: 0~10 Actual Value Range: 0~10 Default Value: 3

ULREXLEVEXPFLTLEN


Meaning: When the network receives measurement reports, the measurement values in several straight measurement reports are filtered to reflect the radio operating environment for the sake of accuracy. This parameter specifies the number of measurement reports sampled for exponent filtering of the uplink signal strength. GUI Value Range: 0~19 Actual Value Range: TCH:0~9120, step:480; SDCCH:0~8930, step:470 Default Value: 3

ULREXLEVHIGHTHRED


Meaning: When the uplink receive level reaches the threshold, Huawei III power control is performed. GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 18

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ULREXLEVLOWTHRED

6 Counters


Meaning: When the uplink receive level is lower than the threshold, Huawei III power control is performed. GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 18

ULREXLEVSLDWINDOW


Meaning: When the network receives measurement reports, the measurement values in several straight measurement reports are filtered to reflect the radio operating environment for the sake of accuracy. This parameter specifies the number of measurement reports sampled for slide-window filtering of the uplink signal strength. GUI Value Range: 1~20 Actual Value Range: TCH:0~9120, step:480; SDCCH:0~8930, step:470 Default Value: 1

ULREXQUALADJFCTR


Meaning: This parameter specifies the uplink quality level factor multiplied by 10 during the calculation of the uplink power control step. The uplink quality level factor is a coefficient indicating how much the quality level is considered during the calculation of the uplink power control step. GUI Value Range: 0~10 Actual Value Range: 0~10 Default Value: 6

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ULREXQUALEXPFLTLEN

6 Counters


Meaning: When the network receives measurement reports, the measurement values in several straight measurement reports are filtered to reflect the radio operating environment for the sake of accuracy. This parameter specifies the number of measurement reports sampled for exponent filtering of the uplink signal quality. GUI Value Range: 0~19 Actual Value Range: TCH:0~9120, step:480; SDCCH:0~8930, step:470 Default Value: 3

ULREXQUALSLDWINDOW


Meaning: When the network receives measurement reports, the measurement values in several straight measurement reports are filtered to reflect the radio operating environment for the sake of accuracy. This parameter specifies the number of measurement reports sampled for slide-window filtering of the uplink signal quality. GUI Value Range: 1~20 Actual Value Range: TCH:0~9120, step:480; SDCCH:0~8930, step:470 Default Value: 1

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6 Counters

ULRXLEVPROTECTFACTOR BSC6900 SET GCELLPWR3(Optional)

Meaning: Signal strength factor for the protective limitation on calculating the uplink power control adjustment step. The calculated step value cannot exceed the step value that is obtained on the basis of the signal strength protection factor and the signal quality protection factor. GUI Value Range: 0~100 Actual Value Range: 0~100 Default Value: 6

ULRXQUALPROTECTFACTOR BSC6900 SET GCELLPWR3(Optional)

Meaning: Signal strength factor for the protective limitation on calculating the uplink power control adjustment step. The calculated step value cannot exceed the step value that is obtained on the basis of the signal strength protection factor and the signal quality protection factor. GUI Value Range: 0~100 Actual Value Range: 0~100 Default Value: 75

ULSSHIGHTHRED


Meaning: When the uplink receive level reaches the threshold, Huawei II power control is performed. GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 30

ULSSLOWTHRED


Meaning: When the uplink receive level is below the threshold, Huawei II power control is performed. GUI Value Range: 0~63 Actual Value Range: 0~63 Default Value: 18

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UPPCEN

6 Counters

BSC6900 SET GCELLBASICPARA(Optional)

Meaning: Whether to allow MS power control GUI Value Range: NO(No), YES(Yes) Actual Value Range: NO, YES Default Value: YES

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6 Counters

6 Counters Table 6-1 Counter description Counter ID Counter Name

Counter Description

Feature ID

Feature Name

1278271417 CELL.MS.PWR.INCREASE.CMD.TIMES S3230A:Number of GBFD-110703 Enhanced Power Control Power Increase Messages Control Sent to MS Algorithm 1278271418 CELL.MS.PWR.DECREASE.CMD.TIMES S3230B:Number of GBFD-110703 Enhanced Power Control Power Decrease Control Messages Sent to Algorithm MS 1278271419 CELL.BTS.PWR.INCREASE.CMD.TIMES S3231A:Number of GBFD-110703 Enhanced Power Control Power Increase Messages Control Sent to BTS Algorithm 1278271420 CELL.BTS.PWR.DECREASE.CMD.TIMES S3231B:Number of GBFD-110703 Enhanced Power Control Power Decrease Control Messages Sent to Algorithm BTS 1278271423 CELL.MS.PWR.LEV.AVR

AS3240:Average GBFD-110703 Enhanced Power Level of MS Power Control Algorithm

1278271424 CELL.BTS.PWR.LEV.AVR

AS3241:Average GBFD-110703 Enhanced Power Level of BTS Power Control Algorithm

1278271453 CELL.NONAMR.MS.PWR.LEV.AVE

AS3240NA:Average GBFD-110703 Enhanced MS Power Level of Power Non-AMR Call Control Algorithm

1278271454 CELL.NONAMR.BTS.PWR.LEV.AVE

AS3241NA:Average GBFD-110703 Enhanced BTS Power Level of Power Non-AMR Call Control Algorithm

1278281475 TRX.EXT.HR.SHORT.AVR.VQI

S4559:Average GBFD-110703 Measurement Value of the HR UL VQI (Voice Quality Index) in the Customized MR

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Enhanced Power Control Algorithm

6-1


6 Counters

1278281476 TRX.EXT.UP.LEV.AVR.PWR

S4560:Average GBFD-110703 Enhanced Uplink Power in the Power Customized MR Control Algorithm

1278281477 TRX.EXT.DN.LEV.AVR.PWR

S4561:Average GBFD-110703 Enhanced Downlink Power in Power the Customized MR Control Algorithm

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6-2


7 Glossary

7 Glossary For the acronyms, abbreviations, terms, and definitions, see the Glossary.

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7-1


8 Reference Documents

8 Reference Documents [1] 3GPP TS 04.08: "Mobile radio interface layer 3: specification" [2] 3GPP TS 05.08: "Digital cellular telecommunications system (Phase 2+); Radio subsystem link control" [3] BSC6900 Feature List [4] BSC6900 Optional Feature Description [5] BSC6900 GSM Parameter Reference [6] BSC6900 GSM MML Command Reference [7] BSC6900 GSM Performance Counter Reference

Issue 01 (2011-03-31)


8-1

2G Power Control

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