Power Margin Optimization

Power Margin Optimization

Huawei Technologies Co., Ltd. Nov. 1 !11

Contents 1 Background........................................................................................................4 1.1 Maximum Power Utility.......................................................................................... ....4

2 Analysis..............................................................................................................4 2.1 Power Margin Introduction..........................................................................................4 2.2 Why power margin.......................................................................................................4 2.3 Optimization ugge!tion.............................................................................................." 2.4 Impact o# ugge!tion................................................................................................ ..." 2." $ain Prediction............................................................................................................."

3 Optimization Trial ...........................................................................................6 3.1 Implementation..................................................................................................... .......% 3.2 &on#irmation o# parameter e##ect.................................................................................% 3.3 'PI &ompari!on #or (rial ...........................................................................................%

4 Implementation for !ole netork ................................................................" 4.1 Implementation..................................................................................................... .......) 4.2 'PI ummary...............................................................................................................) 4.3 &ell (hroughput &ompari!on ................................................................................ .....) 4.4 ummary......................................................................................................................*

# Appendi$ ...........................................................................................................% ".1 'PI +etail.....................................................................................................................*

Power Margin Optimization

"#stract$ This technical paper aims to give the readers meaning of power margin and the optimization of power margin.

Cell throughput can be improved through power margin based on writers’ experience, and no deterioration of call drop rate was observed after optimization in E operator’s UMT networ!.

1 %ac&ground "."

Ma'imum Power (tilit)

 #ccording to $%C performance, the highest of maximum power utilit& '()us& *our+ is onl& -, far below "//. 0h& doesn’t maximum power utilit& reach "//1

Ma' Power (tilit) Top1!

Cell 23 56567 "5695 "588" 666/ 65"5: 65"58 6566" 6557 6559 65:-"

Max 4ower Utilit& 8.79 :.77 :.77 :.77 :.77 :.77 :.77 :.77 :.77 :.77

 "nal)sis 6."

Power Margin *ntroduction

There is a parameter named 4ower Margin in %ode) configuration file. The meaning of power margin is reserved power for $ power control within next 6ms when *34# scheduling.

 #vailable *34# 4ower ; "< 4ower Margin < %on *34# 4ower  The default setting of power margin is 8 of the total power.

6.6

+h) power margin



2f power margin is /, cell power utilit& reaches "// '5/=7/+ when *34# scheduling in slot"

6.5



UE commands %ode) to increase power in slot6



%ode) could not increase power for $ user within 6ms because power is full& consumed



Therefore, reasonable reserved power for $ power control is necessar&

Optimization uggestion 4arameter 40$M>% 

Current etting

uggestion

8

1-

 The highest of Maximum power utilit& is -, : power is left. o 8

power margin is too big, and " power margin is enough 

$ use is ver& few compared to *34# user, so re?uired power

margin for $ power control is low.

// (ser Num#er vs H0P" (ser Num#er  (CLL 2roup t!t/-

6.:

// (ser Num#er /.5::

H0P" (ser Num#er   569./5-"

*mpact o3 uggestion 4alue$ 

The power margin decreases, so the *34# available power will increase, so the

*34# cell throughput ma& increase.

is&$ 

Call 3rop rate of $ service ma& be affected because there is no enough power

for power control.

6.8

2ain Prediction Per3ormance 0ata Mean C@2 "7.6

Mean %on<*34# 4ower Utilit& 65

3A User Throughput'!bps+ ":.-

*34# 4ower >ainB >ain;"/lg''<65+D'8<65++; /.65d) Throughput >ain;5.:"/.65; 6".:9!bps '6.5+ Throughput vs C5*

The above curve is based on plent& of statistics of current networ!

6 Optimization Trial 5."

*mplementation n ct 5rd power margin was modified to " for as a trial

4arameter 40$M>%

5.6

Current etting

uggestion

8

1-

Con3irmation o3 parameter e33ect Max Power Utility &ompari!on

Max Power Utility o,-iou! increa!ed a#ter parameter optimization.

5.5

7P* Comparison 3or Trial

UCEAA >roup Time 3C$ Cell Throughput'!bps+

)efore'.67<"/.6+ /.9 6/--

T!t/-'"9:7 cells+ #fter'"/.:<"/.+ /.8 6"55

Comparison
Cell Throughput ; F.3atautput.Mean D 'F.3ataTti$atio.Mean
&ell throughput increa!ed 3.24 a#ter parameter modi#ication/ howe-er +&0 no o,-iou! degrade.

8 *mplementation 3or whole networ& :."

*mplementation n ct "7th power margin was modified for all %ode).

:.6

7P* ummar)

&'I (omparison

&ell throughput increa!ed a#ter parameter modi#ication/ howe-er +&0 no much change.

:.5

Cell Throughput Comparison &ell (hroughput (rend

:.:

ummar) 

 Cell throughput increased obviousl&



 3C$ no much change

ince 7P* was improved o#viousl) a3ter optimization, 1- power magin is more reasona#le.

9 "ppendi' 8."

7P* 0etail