PsiCoverage USER DESCRIPTION
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Contents
Contents 1
Introduction
1
1.1
Scope
1
1.2
Target Groups
1
2
Overview
2
2.1
FAJ 121 1679: PsiCoverage
2
2.2
FAJ 121 1679: Y-Coverage
3
3
Technical Description
4
3.1
PsiCoverage DL Configuration
4
3.2
PsiCoverage UL Configuration
5
4
Activation and Deactivation
7
4.1
Preconditions for Activation
7
4.2
Activation
7
4.3
Preconditions for Deactivation
7
4.4
Deactivation
7
5
Parameters
8
5.1
Range and Default Values
8
6
Observability
9
6.1
Counters
9
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PsiCoverage
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Introduction
1
Introduction This document describes the PsiCoverage (ψ-Coverage) feature within WCDMA Radio Access Network (RAN).
1.1
Scope This document contains a description of the optional feature ψ-Coverage (FAJ 121 1679), including engineering guidelines and information about the activation and deactivation. For detailed information on software configuration when installing the ψ-Coverage feature, refer to Psi-Coverage Configuration.
1.2
Target Groups The target groups for this document are the following: •
System operators who need a general understanding of ψ-Coverage in WCDMA RAN.
•
Personnel working with Ericsson products or systems.
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1
PsiCoverage
2
Overview This section provides an overview of the optional feature ψ-Coverage (FAJ 121 1679). Two variants of this feature are available: ψ-Coverage and Y-Coverage. Both variants use the same FAJ number. ψ-Coverage feature improves the coverage of a single radio configuration, enabling it to provide identical coverage with GSM for a limited number of WCDMA subscribers. ψ-Coverage feature is incompatible with the following features: •
FAJ 121 1351: 4-Way Receiver Diversity
•
FAJ 121 1652: Enhanced Uplink for FACH
•
FAJ 121 1503: EUL TD Scheduling
•
FAJ 121 1441: Multi Carrier
•
FAJ 121 1352: Find Faulty Antenna Data
•
FAJ 121 1462: Cascading of AISG RET antenna
For further information on the incompatibilities, refer to System Description.
2.1
FAJ 121 1679: PsiCoverage The ψ-Coverage feature provides comparable coverage with GSM 900, even with WCDMA 2100 MHz. ψ-Coverage requires a site configuration where a single RBS 6000 radio is connected to three standard cross-polarized sector antennas. The connection is made using two specially designed 3-way splitter/combiners (S/Cs). The ψ-Coverage feature maps the DL and UL in a way that allows Radio Network Controller (RNC) to view the configuration as a high capacity and high coverage omni Node-B. This allows the normal functioning of other RAN features. The link in ψ-Coverage is asymmetric, to secure comparable coverage with GSM. UL in ψ-Coverage is equivalent to a three-sector site. For UL and DL configuration of ψ-Coverage, see Section 3.1 on page 4 and Section 3.2 on page 5. In the Uplink (UL), ψ-Coverage combines signals received from multiple antenna branches into one radio. The software (SW) feature enables decoding so as to offset the losses in the S/C. ψ-Coverage provides an UL sensitivity
2
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Overview
comparable to an ordinary three-sector configuration and improved UL capacity compared to an omni configuration. On the Downlink (DL), signals sent from the single radio are split into three antennas.
2.2
FAJ 121 1679: Y-Coverage Y-Coverage is a variant of ψ-Coverage that uses two sector antennas instead of three. It is designed for sites where coverage along a straight line, such as a highway, is sufficient. In Y-Coverage, the sector antennas cover different areas, for example, one beam is directed north and the other south. The UL in Y-Coverage has 3dB UL gain compared to a 2-antenna splitter coverage site, due to the frequency shift of the received signal on each Frequency Shifting Tower Mounted Amplifier (TMF).
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3
PsiCoverage
3
Technical Description This section describes the principles used for ψ-Coverage in order to understand its behavior. The main configuration uses three dual sector antennas coupled to either three dual duplex TMFs, or a Triple TMF (TTMF). Radio Base Station (RBS) side of the TMF is coupled to one 3-way S/C for each branch. From the S/C two feeders are connected to the RBS.
3.1
PsiCoverage DL Configuration This section describes the configuration of DL of ψ-Coverage. One 5 MHz carrier and one scrambling code for the DL are configured in the radio. The ψ-Coverage site appears to the RNC as one cell with one sector. The DL signal is split into three paths. The signal is sent transparently through the TMFs or the TTMF without DL impact and is then radiated by the sector antennas. For further information on DL when ψ-Coverage feature is activated, see Figure 1.
4
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Technical Description
X X X X C
RET
TTMF
FAIR D
FAIR
T FAIR
X X X X
FAIR FAIR A
X X X X B
RET
RET
T
E
FAIR F
FAIR
T
FAIR FAIR
o o
o o
o
i
o
i
AISG/Iuant a
b
FAIR
RU U0000878B
Figure 1
DL in ψ-Coverage
RET - Remote Electrical Tilt RU - Radio Unit AISG - Antenna Interface Standards Group
3.2
PsiCoverage UL Configuration This section describes the configuration of UL of ψ-Coverage. The three sector antennas receive the same 5MHz UL carrier. A single UE can be received by more than one antenna simultaneously because of the logical mapping and physical resource use. These signals are then frequency shifted by the respective TMFs or the TTMF and narrowband filtered. The S/C combines the three frequencies (F2, F3, F4) into a multi-carrier signal. A 20 MHz-wide signal arrives at the radio, using either Radio Unit multi-standard (RUS) or Remote Radio Unit multi-standard (RRUS) broadband receiver to its maximum
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PsiCoverage
capacity. For further information on UL when ψ-Coverage feature is activated, see Figure 2. X X X X C
RET
FAIR FAIR
D
NOISE
TTMF
T F3 NOISE
X X X X
FAIR FAIR NOISE A
X X X X B
RET
E
RET
FAIR F
FAIR NOISE
T
F2
T
NOISE
F4 NOISE
o o
o o
o
i
o
i
AISG/Iuant a
b
F2
F3
F4
NOISE
NOISE
NOISE
20Mhz-wide RUS Receiver
RU U0000879B
Figure 2
UL in ψ-Coverage
RET - Remote Electrical Tilt RU - Radio Unit RUS - Radio Unit multi-Standard AISG - Antenna Interface Standards Group
6
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Activation and Deactivation
4
Activation and Deactivation This section describes the activation and deactivation of ψ-Coverage.
4.1
Preconditions for Activation This section describes the preconditions for activation. Before ψ-Coverage (FAJ 121 1679) feature can be activated, the following conditions have to be fulfilled:
4.2
•
The TMFs needed for ψ-Coverage configuration have to be equipped with their respective address adapters. The TTMF contains the address adapters already.
•
Two S/Cs are mounted with the cables connected as shown in Figure 2. The TTMF contains the S/Cs already.
Activation This section describes the activation of ψ-Coverage. ψ-Coverage (FAJ 121 1679) is activated by:
4.3
•
Installing license file with license key CXC 402 0060.
•
Setting the parameter featureStatePsiCoverage to ACTIVATED.
Preconditions for Deactivation There are no preconditions for the deactivation of ψ-Coverage.
4.4
Deactivation This section describes the deactivation of ψ-Coverage. The ψ-Coverage feature can be deactivated by setting the parameter featureStatePsiCoverage to DEACTIVATED. However, license deactivation is not recommended and the only reason for it to be performed is when the site or RBS is being reconfigured to a setup different than a ψ-Coverage site.
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PsiCoverage
5
Parameters This section describes the parameters that the operator can configure to control ψ-Coverage. For further information on parameters, refer to Radio Network Parameters.
5.1
Range and Default Values Table 2 presents operator parameters for ψ-Coverage.
Table 1
Operator Parameters
Parameter Name
Scope of Parameter
Default Value
Value range
Unit of Measur ement
sectorConfiguration
RBS
-
PSI_COVERAGE
-
branchName
RBS
-
A, B, C, D, E, F
-
beamDirection
RBS
-
<000 – 359>
featureStatePsiCoverage
RBS
DEACTIVA TED
ACTIVATED, DEACTIVATED
-
licenseStatePsiCoverage
RBS
DISABLED
ENABLED, DISABLED
-
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Observability
6
Observability This section provides information about counters and events used to observe the behavior of the ψ-Coverage feature. More detailed information on each counter is described in the Managed Object Model (MOM), refer to Managed Object Model (MOM) RNC.
6.1
Counters The following counters used for observability of ψ-Coverage provide valid values only if featureStatePsiCoverage is ACTIVATED. •
pmTotalRotCoverage1
•
pmTotalRotCoverage2
•
pmTotalRotCoverage3
These counters measure the total Rise over Thermal (RoT), including all UL traffic and external interference, that affects the coverage for the appropriate cell portion. •
pmOwnUuLoad1
•
pmOwnUuLoad2
•
pmOwnUuLoad3
These counters measure the power-controlled noise rise caused by the intra-cell interference that affects the Uu load for the appropriate cell portion. •
pmNoiseFloor1
•
pmNoiseFloor2
•
pmNoiseFloor3
These counters measure the distribution of estimated thermal noise level used in Rise over Thermal (RoT) calculations for appropriate cell portion when RbsLocalCell::eulOptimalNoiseFloorLock.eulNoiseFloorLock is FALSE. •
pmAverageRssi1
•
pmAverageRssi2
•
pmAverageRssi3
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PsiCoverage
These counters measure the Received Signal Strength Indicator (RSSI) for the appropriate cell portion. •
pmLEDchTot1
•
pmLEDchTot2
•
pmLEDchTot3
These counters measure the Received Signal Strength Indicator (RSSI) for the appropriate cell portion. •
pmLMaxEDch1
•
pmLMaxEDch2
•
pmLMaxEDch3
These counters measure the total uplink Uu load headroom for a cell available to users configured with an E-DCH for the appropriate cell portion. The system aims to secure that total load from E-DCH users for this cell does not exceed the total uplink Uu load headroom. The sampled value is a load factor and is unitless with range 0..1, where 0 means no load and 1 is maximum possible load. •
pmLdch1
•
pmLdch2
•
pmLdch3
These counters measure the uplink Uu load of a cell for users configured with only Release 99 DCH on the uplink for the appropriate cell portion. Load contributions from DPDCH, DPCCH and HS-DPCCH are included. The sampled value is a load factor and is unitless with range 0..1, where 0 means no load and 1 is maximum possible load. •
pmLother1
•
pmLother2
•
pmLother3
These counters measure the estimated distribution of the Uplink load caused by inter-cell and external interferers for the appropriate cell portion. The sampled value is a load factor and is unitless with range 0..1, where 0 means no load and 1 is maximum possible load.
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•
pmTotRateGrantedEul1
•
pmTotRateGrantedEul2
•
pmTotRateGrantedEul3
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Observability
These counters indicate the total granted Uu rate for all E-DCH users including soft/softer handover by the scheduler for the cell portion.
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