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.