4G Strategy: PUCCH Outer Loop Power Control

Fact Finding:

PUCCH Inner Loop Power Control in eRAN 8.0 is only based on the SINR&RSRP of Format 1a/1b (i.e., ACK channel) but the interference of Format 2/2a/2b (i.e., CQI/PMI/RI channel) is higher than Format 1a/1b

Pro :

It improves the demodulation performance of PUCCH format 2/2a/2b and decreases the false detection rate of PUCCH format 2/2a/2b, thereby increasing downlink throughput.

Cons :

Almost no impact

Execution Selection Criteria :

-This feature must work together with inner-loop PUCCH power control in LBFD-002026 Uplink Power Control

-Site with eRAN v8.1

Background:

The decrease of the SINR of Format 2/2a/2b and impairs the performance of Format 2/2a/2b as result, CQI-feedback performance and downlink throughput may degrades

Parameter Setting :

Level	Command	Parameter	Default value	Script
cell	MOD CELLALGOSWITCH	UlPcAlgoSwitch	InnerLoopPucchSwitch: On	MOD CELLALGOSWITCH: LocalCellId=0, UlPcAlgoSwitch=InnerLoopPucchSwitch-1;
cell	MOD CELLALGOSWITCH	UlPcAlgoSwitch	OuterLoopPucchSwitch: Off	MOD CELLALGOSWITCH: LocalCellId=0, UlPcAlgoSwitch=OuterLoopPucchSwitch-1;

- If the measured BER is greater than the BERTarget, this feature increases the SINRTarget.

- If the measured BER is equal to the BERTarget, this feature does not change the SINRTarget.

- If the measured BER is less than the BERTarget, this feature decreases the SINRTarget.

4G Strategy: CSFB Access Delay Optimization

Background:

LTE CSFB Access Delay = LTE Call Setup + L2W Transition + WCDMA Call Setup

LTE Call Setup: from L3 Extended Service Request (LTE) to RRCConnectionRelease (LTE)

L2W Transition: from RRCConnectionRelease (LTE) to RRC Connection Request (WCDMA)

WCDMA Call Setup: from RRC Connection Request (WCDMA) to Alerting (WCDMA)

Fact Finding:

LTE CSFB L2W transition duration at call setup is longer due to read too many 3G system information..

 Pro :

•CSFB L2W transition duration would be much improved.                            

Cons :

•No negative impacts.

•

Execution Selection Criteria :

•UMTS RAN 16.0 version later

Analysis:

SIB3 schedule optimization，reduce SIB3 schedule period to 160ms; Turn on DMCR, postpone read SIB11 and other system information, reduce CSFB delay; Combine SIB7 and MIB, improve schedule efficiency and reduce system information schedule period.

 

Parameter Setting :

 

3G  Parameter	PERFENH_SIB3_MAX_PEROID_LIMIT_SWITCH	PERFENH_SIB3_SCHEDULE_OPT_SWITCH	DeferMcReadInd	PERFENH_SIB7MIB_COMBINE_SWITCH
Before	0 (Off)	0 (Off)	FALSE	0 (Off)
After	1 (On)	1 (On)	TRUE	1 (On)