Ran 3433 4g5z5i

High Value Feature

RAN3433

NETWORK ENGINEERING

HSUPA Activity Based Power Control

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RAN3433 HSUPA Activity Based Power Control

Introduction Table of contents

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Introduction Overview on the feature • The RAN3433 HSUPA Activity Based Power Control feature introduces the activity based power control for Enhanced Dedicated Channel (E-DCH) s. In this feature, the Uplink (UL) power control is optimized based on the E-DCH activity of the s • With this feature, 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

UE

UE

UE

UE

8-10% improvement in UL Cell throughput 3

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Introduction 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 target reduction aligning to the allocated bitrate - for DTX 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 ramp down/up - 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. 4

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Introduction 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)

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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

SG = 28 (3Mbps) SIR = 7 dB

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

SIR = 6dB

DTX

DTX

SIR = 6dB

SIR = 6dB

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

SG = 28 (3Mbps) SIR = 7 dB

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 DTX detection period one HARQ cycle in HSUPA L2 PS is to be used for (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 improves the throughput of the transmitting Ues for UL.

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Introduction Functional description cont. - example 3 3) SIR ramp down/up for Time-Division-Scheduled 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

H3

H4

H5

H6

H7

H0

H1

H2

H3

SG = 27 (2.2 Mbps) SIR = 5.7dB

SIR target = max (2.7dB)

SIR target = max (2.7dB)

SIR target = max (2.7dB)

SIR target = max (2.7dB)

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 = 27 (2.2 Mbps) SIR = 5.7dB

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UL transmission in active HARQ

DTX in deactivated HARQs

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 target - this helps in stability of power control and better channel estimations

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Introduction Before & after

Before

After

• HSUPA traffic is highly bursty in nature, unlike voice calls and HSDPA traffic

• Feature RAN3433 proposes to maintain optimum SIR target whenever the is in DTX due to inactivity or due to Time Division Scheduling and are introduced to reduce the control channel overhead and improve air interface capacity:

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

• SIR target reduction aligning to the allocated bitrate for DTX UEs • SIR ramp down/up for DTX UEs • SIR ramp down/up for Time Division scheduled UEs

• Due to the increased usage of time division scheduling, SIR targets for 2ms HARQ UEs are maintained at high level. In such cases Control channel overhead from the deactivated HARQs is quite high

• With this feature, 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

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Introduction Dependency Table (RAN3433)

Release information RAS release RNC release mcRNC release AirScale RNC release BTS Flexi release BTS SRAN release (Flexi MR) BTS SRAN release (AirScale) NetAct release UE release 8

Sales information

WCDMA19 WBTS19

BSW/ASW License control in NE License control attributes RAS SW component

SBTS19 SBTS19 NetAct 18A SP1901 NetAct 18 SP1808 FP -

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ASW BTS LK Long-term on/off

RAN

RAN3433 HSUPA Activity Based Power Control

Benefits and Gains Table of contents

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Benefits and Gains RAN3433 HSUPA Activity Based Power Control

• 8-10% improvement in UL Cell throughput • Reduced UL intra and inter-cell interference due to limited interference from control channels • Reduced control channel overhead • No degradation of RTT timing

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RAN3433 HSUPA Activity Based Power Control

Interdependencies Table of contents



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Interdependencies Overview

Prerequisite mandatory features to be enabled prior RAN3433

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RAN1470 HSUPA 2 ms TTI

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RAN3433 HSUPA Activity Based Power Control

Interdependencies

prerequisite

RAN1470 HSUPA 2 ms TTI • Feature RAN1470 is mandatory for RAN3433 feature usage. The following feature must be activated before activating the RAN3433 

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More details available on WebNEI: RAN1470

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Interdependencies

extensions

RAN3045 Activity based UL power control for Rel99 DCH • If RAN3433 and RAN3045 are activated together, the gain is expected to increase considering that the cells will have mix of both Rel99 calls and HSPA calls 

More details available on WebNEI: RAN3045

RAN3043 Advanced HSUPA Time division scheduling • If RAN3433 and RAN3043 are activated together, it is expected to improve the gain in cell throughput 

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More details available on WebNEI: RAN3043

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Interdependencies

extensions

RAN3383 Time Division Scheduling for High Uplink Data Rates • If RAN3433 and RAN3383 are activated together, it is expected to improve the gain in cell throughput 

More details available on WebNEI: RAN3383

RAN3263 Enhanced Power Control • If RAN3433 and RAN3263 are activated together, it is expected to improve the gain in cell throughput 

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More details available on WebNEI: RAN3263

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Interdependencies

extensions

RAN3377 Smooth Power Control for High Uplink Data Rates • In RAN3377 ILPC is optimized to make SIR estimation more accurate and stable 

More details available on WebNEI: RAN3377

RAN2922 CCH IC • If RAN3433 and RAN2922 are activated together, it is help to improve the gain 

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More details available on WebNEI: RAN2922

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RAN3433 HSUPA Activity Based Power Control

Configuration Management Table of contents



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Configuration Management New parameter Abbreviated name BTSSCW:hsupaActiv ityBasedPCEnabled

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Description

Range and step

This parameter indicates if HSUPA Activity Based Power Control feature is activated in the BTS or not.

0 (disabled) 1 (enabled)

Full name HSUPA Activity Based Power Control enabled

Nokia Internal Use Nokia internal use

Default PKDB link 0 (disabled)

link

RAN3433 HSUPA Activity Based Power Control

Deployment Aspects Network graphic boxes

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Network element boxes

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Table of contents

Deployment Aspects Configuration of HSUPA Avtivity Based Power Control Procedure notification: •

The RAN3433 HSUPA Activity Based Power Control feature is an optional feature (ASW) and it is controlled by the BTS license key ‘HSUPA-Activity-Based- Power-Control LK’

•

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

Steps to activation: The RAN3433 HSUPA-Activity-Based-Power-Control feature is enabled in the cell when the following conditions are true:

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•

The RAN1470: 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)

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Deployment Aspects Configuration of HSUPA Avtivity Based Power Control •

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

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RAN3433 HSUPA Activity Based Power Control

Performance Aspects Table of contents



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Performance Aspects New counters Counter name

SUM_HSUPA_USR_OPTIMIZED_SIR (M5005C72) #HSPA in WBTS

Description Sum of E-DCH s 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 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

The number of samples TTIs taken for the counter SUM_HSUPA_USR_OPTIMIZED_SIR, which are needed for average calculation.

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.

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M5005C72

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Performance Aspects Feature impact on KPIs Feature impact

How to measure?

HSUPA UL Cell throughput 8-10% increase

KPIs:

It is real network traffic comprising 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.

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