Ran 3433

High Value Feature

HSUPA Activity Based Power Control

Introduction Table of contents

Overview on the feature •

The RAN The AN34 343 33 HS HSU UPA Ac Acti tivvit ityy Ba Base sed d Po Pow wer Contr Co ntrol ol fe feat atur ure e in intro trodu duce cess the ac acti tivi vity ty ba base sed d power control for Enhanced Dedicated Channel (E-DCH (EDCH)) us users ers.. In th this is fea featur ture, e, th the e Upl Uplink ink (U (UL) L) power control is optimized based on the E-DCH activity of the users

UE

UE •

With this feature, feature, the SIR tar target getss are adjusted adjusted based on the UE EDCH activity in UL. This reduces the control channel overhead and in turn reduces the intra and inter cell interference resulting in improved cell UL throughput

UE

UE

8-10% improvement in UL Cell throughput

Functional description on the RAN3433 Considering the HSUPA traffic nature and increased usage of Time Division Scheduling the following optimizations are introduced to reduce the control channel overhead and improve air interface capacity: 1) SIR target reduction aligning to the allocated bitrate - for DTX UEs 2) SIR ramp down/up - for DTX UEs 3) SIR ramp down/up for Time-Division-Scheduled UEs

1) SIR targ target et reducti reduction on ali aligni gning ng to the all alloca ocated ted bitrate bitrate - for for DTX UEs UEs The SIR target reduction is performed corresponding to the downgraded bit rate of the UE, immediately followed by the Discontinuous Transmission (DTX) downgrades. This reduction maintains the SIR at the optimum level before the next burst starts, followed by the OLPC actions. This optimization is applicable for all 2ms one/all HARQ UEs.

2) SIR ram ramp p down/ down/up up - for for DTX UEs The SIR target is ramped down when the UE becomes inactive and ramped back up to the original target when the UE transmission starts again. This optimization is applicable for all 2ms one/all HARQ and 10ms TTI UEs. Monitor the UE transmission pattern continuously to control this functionality dynamically.

Functional description cont. – Sub-Feature 1 and 2

UL Transmission

UL Transmission DTX

SG = 29 (4Mbps) SIR = 8.9 dB

SG = 28 (3Mbps) SIR = 7 dB

SG is reduced due to DTX SIR target also is reduced to follow new SG (Sub-Feature 1)

• •

• •

DTX

SIR = 6dB

DTX continues. SIR target is further reduced by additional offset e.g. 1 dB (Sub-Feature 2)

DTX

SIR = 6dB

UL Transmission DTX


SIR target is increased back by same offset value reduced earlier (Sub-Feature 2)

SIR = 6dB

DTX

DTX

SIR = 6dB SI

SIR = 6dB

DTX detected. SIR target is reduced by additional offset e.g. 1 dB (Sub-Feature 2)


SIR target is increased back by same offset value reduced earlier (Sub-Feature 2)

SG reduction is done by HSUPA L2, change in SG and SIR target is to be indicated by HSUPA L2 to RAKE Existing Existi ng DTX detection detection period one HARQ cycle in HSUPA L2 PS is to be used for (Sub-Feature (Sub-Feature 1). DTX detection period for (Sub-Feature 2) is to be longer than period used for (Sub-Feature 1) Sub-Feature 2 is to be handled completely within RAKE SIR target reduction reduction improves improves the throughput of the transmitting transmitting Ues for UL.

Functiona Funct ionall description description cont. - exam example ple 3 3) SIR ramp down down/up /up for Time Time-Div -Divisio ision-Sc n-Schedu heduled led UEs The SIR target is ramped down after UE transmission in activated HARQ and ramped up to original target a few slots before the activated HARQ process.

UL transmission in active HARQ

UL transmission in active HARQ

DTX in deactivated HARQs

H3

H4

H5

H6

H7

H0

H1

H2

H3

SG = 27 (2.2 Mbps) SIR = 5.7dB

SIR target = max (2.7dB)





SIR target ramp up status to reach. Target = 5.7dB at 4 slots before active HARQ

SIR = 5.7dB

SG = 2 7 (2.2 Mbps) SIR = 5.7dB

•

• •

SIR target is to be ramped down after transmission is completed in active HARQ. Then SIR target is to be ramped up again back to the original target at 4 slots before the active HARQ RAKE may take 1-2 slots for the SIR target ramp up back to the original target at 4 slots before the active HARQ SIR target is to be reduced to the max 3 dB from the original original target - this helps in stability stability of power control control and better channel estimations

Before & after

Before •

•

•

HSUPA traffic is high HSUPA highly ly bursty in natur nature, e, unlike voice calls and HSDPA traffic

After •

SIR targets for these these UEs stay at higher level during during idle times between UL bursts

Feature RAN3433 proposes to maint maintain ain optim optimum um SIR SI R ta targ rget et wh when enev ever er th the e us user er is in DT DTX X du due e to inactivity or due to Time Division Scheduling and are introduced to reduce the control channel overhead and improve air interface capacity: •

D Du ue to the in inccre reas ased ed usa sage ge of tim ime e di divi vissio ion n sche sc hedu duli ling ng,, SI SIR R ta targ rget etss fo forr 2m 2mss HA HARQ RQ UE UEss ar are e main ma inta tain ined ed at hi high gh le leve vel. l. In su such ch ca case sess Co Cont ntro roll chann cha nnel el ov overh erhead ead fro from m the dea deact ctiva ivated ted HAR HARQs Qs is quite high

• •

•

SIR target reduction aligning aligning to the allocated bitrate for DTX UEs SIR ramp down/up down/up for DTX UEs UEs SIR ramp dow own n/up for Tim ime e Divis isiion scheduled UEs

With this feature, the the SIR targets are adjusted based on the UE EDCH activity in UL. This reduces the control channel overhead and in turn reduces the intra and inter cell interference resulting in improved cell UL throughput

Dependen Depe ndency cy Table (RAN3 (RAN3433) 433)

Release information RAS release RNC release mcRNC release AirScale RNC release BTS Fl Fle exi rele lea ase BTS SRAN release (Flexi MR) BTS SRAN release (AirScale) NetAct release UE release

WCDMA19 WBTS19

SBTS19 SBTS19 NetAct 18A SP1901 NetAct 18 SP1808 FP -

Sales information BSW/ASW Lice Li cens nse e co cont ntro roll in NE License control attributes RAS SW component

ASW BTS BT S LK Long-term on/off

RAN

Benefits and Gains Table of contents

RAN3433 HSUPA Activity Based Power Control

•

8-10% improv improvement ement in UL Cell throughp throughput ut

•

Reduced UL intra and inter-cell interference due to limited interference from control channels

•

Reduced control channel overhead

•

No degradation of RTT timing

Interdependencies Table of contents

Overview

Prerequisite mandatory features to be enabled prior RAN3433

RAN1470 HSUPA 2 ms TTI

RAN3433 HSUPA Activity Based Power Control

prerequisite

RAN1470 HSUPA 2 ms TTI •

Fea Featu ture re RA RAN1 N147 470 0 is ma mand ndat ator oryy fo forr RA RAN3 N343 433 3 fe feat atur ure e us usag age. e. Th The e following feature must be activated before activating the RAN3433 

More details available on WebNEI: WebNEI: RAN1470 RAN1470

extensions

RAN3045 Activity based UL power control for Rel99 DCH •

If RAN3433 and RAN3045 RAN3045 are activated together, the gain is expected to increase considering that the cells will have mix of both Rel99 calls and HSPA calls 


RAN3043 Advanced HSUPA Time division scheduling •

If RAN RAN343 3433 3 and RAN3043 RAN3043 are activate activated d tog togethe ether, r, it is exp expect ected ed to improve the gain in cell throughput 


extensions

RAN3383 Time Division Scheduling for High Uplink Data Rates •

If RAN RAN343 3433 3 and RAN3383 RAN3383 are activate activated d tog togethe ether, r, it is exp expect ected ed to improve the gain in cell throughput 


RAN3263 Enhanced Power Control •

If RAN RAN34 3433 33 an and d RAN RAN32 3263 63 are act activa ivated ted to toget gether her,, it is exp expect ected ed to improve the gain in cell throughput 


extensions

RAN3377 Smooth Power Control for High Uplink Data Rates •

In RAN3377 ILPC is optimized to make SIR estimation estimation more accurate and stable 


RAN2922 CCH IC •

If RAN3 RAN3433 433 and RAN2922 RAN2922 are activ activated ated together, together, it is help to improve the gain 


Configuration Management Table of contents

New parameter Abbreviated name

Full name

HSUPA Activity BTSSCW:hsupaActiv Based Power ityBasedPCEnabled Control enabled

Description

Range and step

This par This parame ameter ter ind indica icates tes if HSU HSUPA PA Activity Based Power Control feature is activated in the BTS or not.

0 (disabled) 1 (enabled)

Default Def ault PKDB lin linkk 0 (disabled)

link

Deployment Aspects Network graphic boxes

Network element boxes

Table of contents

Configuration of HSUPA Avtivity Based Power Power Control Procedure Procedu re notifi notification: cation: The RAN3433 RAN3433 HSUPA Activity Based Power Power Control feature is an optional optional feature (ASW) and it is controlled controlled by the BTS license key ‘HSUPA-Activity-Based- Power-Control LK’

•

Feature requires BTS license ‘HSUPA-Activity-Based-Power-Control’ ( (Feature Feature Code: 0000039721)

•

Stepss to act Step activa ivation tion:: The RAN3433 HSUPA-Activity-Based-Power-Control HSUPA-Activity-Based-Power-Control feature is enabled in the cell when the following conditions are true: •

•

The RAN1470: RAN1470: HSUPA HSUPA 2ms TTI feature is activated The BTS license key ‘HSUPA-Activity-Based-Power-Control LK' is installed in the BTS and the state of the license key is ‘On’ (1)

Configuration of HSUPA Avtivity Based Power Power Control •

Value of the the parameter parameter BTSSCW - hsupaActivityBasedPCEnab hsupaActivityBasedPCEnabled led is set to 'Enabled’ (1)

Performance Aspects Table of contents

New counters Counter name

SUM_HSUPA_USR_OPTIMIZED_SIR (M5005C72) #HSPA in WBTS

Description Sum of E-DCH users in each TTI, whose SIR target has been changed in the TTI due to optimization made by HSUPA Activity Based Power Control functionality. The calculation is done only for the serving cell. Trigger event: This counter is updated for every user in each TTI, whose SIR target is optimized due to HSUPA Activity Based Power Control functionality. Use case: Gives activity of the RAN3433 optimization algorithm.

DENOM_HSUPA_USR_OPTIMIZED_SIR (M5005C73) #HSPA in WBTS

T he number of samples TTI s taken for the counter SUM_HSUPA_USR_OPTIMIZED_SIR, which are needed for average calculation.

M5005C72

Trigger event: The counter is updated for each TTI when HSUPA Activity Based Power Control functionality is active. Use case: Gives activity of the RAN3433 optimization algorithm.

Feature impact on KPIs Feature impact

How to measure?

HSUPA UL Cell throughput 8-10% increase

KPIs:

It is re real al ne netw twor orkk tr traf affi ficc co comp mpri risin sing g a mix of This KPI is mainly meant for following up overall traffic (RNC1883c) This KPI is mainly meant for following up overall traffic (RNC931c) bursty and non bursty UL data transfer.

Ran 3433

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