zgo-04-02-002 dynamic ms power control feature guide zxg10-ibsc (v12.2.0)20130410_548234

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ZGO-04-02-002 Dynamic MS

Power ControlFeature Guide



ZGO-04-02-002 Dynamic MS Power Control

ZTE Confidential Proprietary 1

ZGO-04-02-002 Dynamic MS Power Control Version Date Author Reviewer Notes

V1.0 2013/04/01 Tian Kang

GU Commercial

System Supporting

Dept.

Not open to the third party

© 2013 ZTE Corporation. All rights reserved.

ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used

without the prior written permission of ZTE.

Due to update and improvement of ZTE products and technologies, information in this document is subjected to

change without notice.




2 ZTE Confidential Proprietary

TABLE OF CONTENTS

1

Feature Attribute ............................................................................................... 6

2

Overview ............................................................................................................ 6

2.1

Feature Introduction ............................................................................................. 6

2.2

License Control .................................................................................................... 7

2.3 Correlation with Other Features ........................................................................... 7

3 Technical Description ....................................................................................... 7

4

Parameters and Configurations ....................................................................... 9

4.1

Parameter List ..................................................................................................... 9

4.2

Parameter Configuration .................................................................................... 10

4.2.1

Uplink level Sample count .................................................................................. 10

4.2.2

Uplink level Weight ............................................................................................ 10

4.2.3

Uplink quality Sample count ............................................................................... 11

4.2.4

Uplink quality Weight ......................................................................................... 11

4.2.5

Uplink power control allowed ............................................................................. 12

4.2.6

Increase uplink level Threshold .......................................................................... 12

4.2.7

Decrease uplink level Threshold ........................................................................ 13

4.2.8

Increase uplink quality Threshold ....................................................................... 13

4.2.9

Decrease uplink quality Threshold ..................................................................... 14

4.2.10

Increase uplink level Value P ............................................................................. 14

4.2.11

Increase uplink level Value N ............................................................................. 15

4.2.12

Decrease uplink level Value P............................................................................ 16

4.2.13

Decrease uplink level Value N ........................................................................... 16

4.2.14

Increase uplink quality Value P .......................................................................... 17

4.2.15

Increase uplink quality Value N .......................................................................... 17

4.2.16

Decrease uplink quality Value P ......................................................................... 18

4.2.17 Decrease uplink quality Value N ........................................................................ 19

4.2.18

MAX power level of MS ...................................................................................... 19

4.2.19

MIN power level of MS ....................................................................................... 20

4.2.20

Uplink rapid power control .................................................................................. 21

4.2.21 MIN interval of power control.............................................................................. 22

4.2.22

Power control PwrDecrLimit ............................................................................... 22

4.2.23

Report period of measurement for power control ............................................... 23

5

Related Counters and Alarms ........................................................................ 23

5.1

Related Counters ............................................................................................... 23

5.2

Related Alarms .................................................................................................. 24





6

Engineering Guide .......................................................................................... 24

6.1

Application Scenario .......................................................................................... 24

6.2

Configuration Description ................................................................................... 24

6.3

Feature Validation .............................................................................................. 26

6.3.1

UL Power Control ---bad quality ......................................................................... 26

6.3.2

UL Power Control ---low level ............................................................................ 27

6.4

Feature Turn off ................................................................................................. 28

6.5

Network Impact .................................................................................................. 28

7

Abbreviation .................................................................................................... 28

8 Reference Document ....................................................................................... 28





FIGURES

Figure 6-1 Configuration Interface ......................................................................................25

TABLES

Table 4-1 Parameter List ....................................................................................................... 9

Table 4-2 Uplink level Sample count ....................................................................................10

Table 4-3 Uplink level Weight ...............................................................................................10

Table 4-4 Uplink quality Sample count .................................................................................11

Table 4-5 Uplink quality Weight ............................................................................................11

Table 4-6 Uplink power control allowed ................................................................................12

Table 4-7 Increase uplink level Threshold ............................................................................12

Table 4-8 Decrease uplink level Threshold ...........................................................................13

Table 4-9 Increase uplink quality Threshold .........................................................................13

Table 4-10 Decrease uplink quality Threshold ......................................................................14

Table 4-11 Increase uplink level Value P ..............................................................................14

Table 4-12 Increase uplink level Value N..............................................................................15

Table 4-13 Decrease uplink level Value P ............................................................................16

Table 4-14 Decrease uplink level Value N ............................................................................16

Table 4-15 Increase uplink quality Value P ...........................................................................17

Table 4-16 Increase uplink quality Value N ...........................................................................17

Table 4-17 Decrease uplink quality Value P .........................................................................18

Table 4-18 Decrease uplink quality Value N .........................................................................19

Table 4-19 MAX power level of MS ......................................................................................19

Table 4-20 MIN power level of MS........................................................................................20

Table 4-21 Uplink rapid power control ..................................................................................21

Table 4-22 MIN interval of power control ..............................................................................22





Table 4-23 Power control PwrDecrLimit ...............................................................................22

Table 4-24 Report period of measurement for power control ................................................23

Table 5-1 Counters list .........................................................................................................23





1 Feature Attribute

BSC Version: [ZXG10-iBSC GSM (V6.30.102)]

BTS Version: [Suits for all SDR versions]

Property: [Optional]

Related Network Element:

NE Name Related or Not Special Requirements

MS √

BTS √

BSC √

MSC -

MGW -

SGSN -

GGSN -

HLR -

Dependent Function: [None]

Exclusive Function: [None]

Note: [None]

2 Overview

2.1 Feature Introduction

Radio frequency power control is to change the transmission power of MS or BTS, or

both of them by radio means within a certain range, aiming at optimizing the transmission

power of MS and BTS without affecting wireless transmission quality. It improves

spectrum efficiency, reduces the average transmission power of MS and BTS and





alleviates the interferences on other channels. In mobile system, interference alleviation

means to enhance the spectrum efficiency.

The uplink dynamic power control means that the radio frequency power control is

performed on MS. The purpose of MS power control is to adjust the output power of MS

and enable BTS to get stable signaling receiving strength, which restricts the

interferences from co-channel subscribers, reduces MS power consumption and

prolongs the mean up time of MS.

2.2 License Control

None license control for this feature in UR12 Release.

2.3 Correlation with Other Features

The uplink level’s expectation lower limit of MS power control should be set less than the

handover threshold that uplink level triggers; the uplink level’s expectation upper limit of

MS power control should be set less than the handover threshold that uplink quality

triggers. If increasing MS transmission power is able to improve uplink level and quality,

no handover is needed.

For algorithm of power control, please refer to ZGO-04-02-001 Dynamic BTS Power

Control .

3 Technical Description

Power control is an important method for radio link control. The dynamic MS power

control allows MS to conduct dynamic control over the output power of MS. In ZTE

system, dynamic power control is performed by BTS. The transmission power of MS is

adjusted according to an overall judgment based on the expectation, uplink level and

quality and the required transmission power calculated by maximum transmission power

of MS.

Power control should stick to the following basic principles:





Power will be decreased appropriately when the level or quality is higher than the

expectation.

Power will be increased appropriately when the level or quality is lower than the

expectation.

Both level and quality factors should be taken into overall consideration to make

power control more accurate and effective.

MS power control consists of two phases.

At the beginning, that is, when MS and BTS start connection, BSC selects an initial

transmission power for MS and BTS. When MS is connected to the network through a

random access channel, its transmission power is the permissible maximum

transmission power obtained in the system message broadcast on the BCCH channel of

the cell where it resides. This fixed value, according to the system specifications, is also

the power level of the first message sent out by MS on the dedicated channel. The MS

power is not controlled by the system until the power control command carried in the

SACCH message block is received, indicating the start of the second phase of MS power

control, namely the regular MS power control.

In the regular MS power control phase, BTS, after receiving a certain number of uplink

measurement reports, processes the measurement data to obtain the actual uplink

reception level and quality and makes a comparison with the preset thresholds. Then the

power level to which MS should be adjusted can be calculated. BTS sends to MS a

command of changing MS power through the layer 1 header carried in each downlink

SACCH message block. MS extracts power control information from the downlink

SACCH and uses the transmission power specified in this information as its output power,

and sets the power level in current use in the layer 1 header of the uplink SACCH and

sends it together with the measurement report to BSS. If the MS power level is unable to

output the specified power value, it will output the power that is supported by MS and

closest to the specified value.

During handover, MS uses the maximum transmission power adopted in the target cell.





4 Parameters and Configurations

4.1 Parameter List

Table 4-1 Parameter List

SN Name Figure

1 Uplink level Sample count Figure 6-1

2 Uplink level Weight Figure 6-1

3 Uplink quality Sample count Figure 6-1

4 Uplink quality Weight Figure 6-1

5 Uplink power control allowed Figure 6-1

6 Increase uplink level Threshold Figure 6-1

7 Decrease uplink level Threshold Figure 6-1

8 Increase uplink quality Threshold Figure 6-1

9 Decrease uplink quality Threshold Figure 6-1

10 Increase uplink level Value P Figure 6-1

11 Increase uplink level Value N Figure 6-1

12 Decrease uplink level Value P Figure 6-1

13 Decrease uplink level Value N Figure 6-1

14 Increase uplink quality Value P Figure 6-1

15 Increase uplink quality Value N Figure 6-1

16 Decrease uplink quality Value P Figure 6-1

17 Decrease uplink quality Value N Figure 6-1

18 MAX power level of MS Figure 6-1

19 MIN power level of MS Figure 6-1

20 Uplink rapid power control Figure 6-1

21 MIN interval of power control Figure 6-1

22 Power control PwrDecrLimit Figure 6-1

23 Report period of measurement for power control Figure 6-1





4.2 Parameter Configuration

4.2.1 Uplink level Sample count

Table 4-2 Uplink level Sample count

Full name Uplink level Sample count

Abbreviation pcUlLevWindow

Description

The parameter PcUlLevWindow represents the window size

(that is, the number of sample values) used to calculate theaverage value of uplink signal strength.

Managed object Power Control

Value range 1..31

Unit None

Default value 6

4.2.2 Uplink level Weight

Table 4-3 Uplink level Weight

Full name Uplink level Weight

Abbreviation pcUlLevWindow

Description


(that is, the number of sample values) used to calculate the

average value of uplink signal strength.


Value range 1..31

Unit None

Default value 6





4.2.3 Uplink quality Sample count

Table 4-4 Uplink quality Sample count

Full name Uplink quality Sample count

Abbreviation pcUlQualWindow

Description


(that is, the number of sample values) used to calculate the

average value of uplink signal strength.


Value range 1..31

Unit None

Default value 6

4.2.4 Uplink quality Weight

Table 4-5 Uplink quality Weight

Full name Uplink quality Weight

Abbreviation pcUlQualWeight

Description

This parameter determines the weight for the first type of

measurement data when averaging uplink signal quality for

power control.

Weight for the second type of measurement data is set to 1 by

default.


Value range 1..3

Unit None

Default value 2





4.2.5 Uplink power control allowed

Table 4-6 Uplink power control allowed

Full name Uplink power control allowed

Abbreviation pwrControlUl

Description

According to different demands from the network, object for the

power control can be chosen. If the MS transmission power

needs to be adjusted dynamically, enable this parameter Uplink

Power Control.


Value range0: Off

1: On

Unit None

Default value 1

4.2.6 Increase uplink level Threshold

Table 4-7 Increase uplink level Threshold

Full name Increase uplink level Threshold

Abbreviation pcUlInclLevThs

Description

This parameter falls into the follwoing seven types: FR, HR,

AFS, AHS,FR-AMR-WB, OFR-AMR-WB, and OHR-AMR-WB.

It can independently control various voice versions. Uplink

receiving strength is one of the factors that may lead to MS

power increased in the uplink direction. If P out of N recentuplink signal strength averages are lower than the related

thresholds, the uplink transmission power of MS should be

increased, because the strength of uplink signals is too weak.


Value range 0..63

Unit None

Default value [22,22,22,22,22,22,22]





4.2.7 Decrease uplink level Threshold

Table 4-8 Decrease uplink level Threshold

Full name Decrease uplink level Threshold

Abbreviation pcUlRedLevThs

Description





power decreased in the uplink direction. The judge process is

as follows: If P out of N recent uplink signal strength averages

are higher than the related thresholds,the uplink transmission

power of MS should be decreased, because the strength of

uplink signals is too strong.


Value range 0..63

Unit None

Default value [30,30,30,30,30,30,30]

4.2.8 Increase uplink quality Threshold

Table 4-9 Increase uplink quality Threshold

Full name Increase uplink quality Threshold

Abbreviation pcUlInclQualThs

Description

This parameter falls into the follwoing seven types: FR, HR, AFS, AHS,FR-AMR-WB, OFR-AMR-WB, and OHR-AMR-WB.


receiving quality is one of the factors that may lead to MS

power increased in the uplink direction. The judge process is as

follows: If P out of N recent uplink signal strength averages are

higher than the related thresholds,the uplink transmission

power of MS should be increased, because the strength of

uplink signals is too weak.






Value range 0..7

Unit None

Default value [2,2,2,2,2,2,2]

4.2.9 Decrease uplink quality Threshold

Table 4-10 Decrease uplink quality Threshold

Full name Decrease uplink quality Threshold

Abbreviation pcUlRedQualThs

Description






as follows: If P out of N recent uplink signal quality averages

are lower than the related thresholds, the uplink transmission

power of MS should be decreased, because the quality of

uplink signals is too good.


Value range 0..7

Unit None


4.2.10 Increase uplink level Value P

Table 4-11 Increase uplink level Value P

Full name Increase uplink level Value P

Abbreviation pcUlInclLevP





Description





power increased in the uplink direction. If P out of N recent

uplink signal strength averages are lower than the related




Value range 1..31

Unit None


4.2.11 Increase uplink level Value N

Table 4-12 Increase uplink level Value N

Full name Increase uplink level Value N

Abbreviation pcUlInclLevN

Description





power increased in the uplink direction. If P out of N recent

uplink signal strength averages are lower than the related




Value range 1..31

Unit None






4.2.12 Decrease uplink level Value P

Table 4-13 Decrease uplink level Value P

Full name Decrease uplink level Value P

Abbreviation pcUlRedLevP

Description







are higher than the related thresholds,the uplink transmission




Value range 1..31

Unit None


4.2.13 Decrease uplink level Value N

Table 4-14 Decrease uplink level Value N

Full name Decrease uplink level Value N

Abbreviation pcUlRedLevN

Description

This parameter falls into the follwoing seven types: FR, HR, AFS, AHS, FR-AMR-WB, OFR-AMR-WB, and OHR-AMR-WB.





are higher than the related thresholds, the uplink transmission








Value range 1..31

Unit None


4.2.14 Increase uplink quality Value P

Table 4-15 Increase uplink quality Value P

Full name Increase uplink quality Value P

Abbreviation pcUlInclQualP

Description







higher than the related thresholds, the uplink transmission




Value range 1..31

Unit None


4.2.15 Increase uplink quality Value N

Table 4-16 Increase uplink quality Value N

Full name Increase uplink quality Value N

Abbreviation pcUlInclQualN





Description







higher than the related thresholds, the uplink transmission




Value range 1..31

Unit None


4.2.16 Decrease uplink quality Value P

Table 4-17 Decrease uplink quality Value P

Full name Decrease uplink quality Value P

Abbreviation pcUlRedQualP

Description


AFS, AHS,

FR-AMR-WB, OFR-AMR-WB, and OHR-AMR-WB.


receiving

quality is one of the factors that may lead to MS power

decreased in the

uplink direction. The judge process is as follows: If P out of Nrecent

uplink signal quality averages are lower than the related

thresholds, the

uplink transmission power of MS should be decreased,

because the

quality of uplink signals is too good.


Value range 1..31





Unit None


4.2.17 Decrease uplink quality Value N

Table 4-18 Decrease uplink quality Value N

Full name Decrease uplink quality Value N

Abbreviation pcUlRedQualN

Description


AFS, AHS, FR-AMR-WB, OFR-AMR-WB, and OHR-AMR-WB.




as follows: If P out of N recent uplink signal quality averages

are lower than the related thresholds, the uplink transmission

power of MS should be decreased, because the quality of

uplink signals is too good.


Value range 1..31

Unit None


4.2.18 MAX power level of MS

Table 4-19 MAX power level of MS

Full name MAX power level of MS

Abbreviation msTxPwrMax





Description

During the communication between the MS and the BTS, the

transmission power is controlled by the network. The network

sets the power for MS through the power command and the

command is transmitted on SACCH (SACCH has 2 header

bytes, one is the power control byte and the other is the timing

advance byte).

MS must extract the power control header from downward

SACCH and takes the specified transmission power as output

power. If the power level of MS cannot output the power value,

it will output the closest transmission power that can be output.

During BSC power control, this parameter determines the

maximum transmission power available for MS in the cell. BSC

also uses it to calculate PBGT value. The maximum power levelof the MS falls into the following types: FR, HR, AMR FR,and

AMR HR.


Value range 0..31

Unit None


4.2.19 MIN power level of MS

Table 4-20 MIN power level of MS

Full name MIN power level of MS

Abbreviation msTxPwrMin





Description

During the communication between the MS and the BTS, the

transmission power is controlled by the network. The network

sets the power for MS through the power command and the

command is transmitted on SACCH (SACCH has 2 header

bytes, one is the power control byte and the other is the timing

advance byte).

The MS must extract the power control header from downward

SACCH and takes the specified transmission power as output

power. If the power level of MS cannot output the power value,

it will output the closest transmission power that can be output.

When BSC is performing power control, this parameter is the

minimal transmission power (that is, lower limit of power

control) that can be used by MS in the cell. The minimum powerlevel of the MS falls into the following four types: FR, HR, AMR

FR, and AMR HR.


Value range 0..31

Unit None

Default value [16,16,16,16,16,16,16]

4.2.20 Uplink rapid power control

Table 4-21 Uplink rapid power control

Full name Uplink rapid power control

Abbreviation ulRapidPcInd

Description

This parameter indicates the availability of the rapid power

control process. The rapid power control process is an optional

process of BSC.

It reduces the interference of the whole BSS radio system and

satisfies the dynamic power control requirement for rapid

moving MS.

The amplitude of power control used by rapid power control

process each time is no longer a fixed value, but an integer

multiple of cell parameter power control step (increase and

decrease).






Value range 0..1

Unit None

Default value 0

4.2.21 MIN interval of power control

Table 4-22 MIN interval of power control

Full name MIN interval of power control

Abbreviation pcMinInterval

Description

This parameter indicates the minimum interval of power control.

Usually,

MS still sends two measurement reports with the original power

to BSC after enabling the power control. Signal level

information contained in the reports is inaccurate and can be

ignored (information such as adjacent cell information is still

valid). Thus a minimum interval of power control is needed and

signal level information during the interval can be ignored.


Value range 1..32

Unit None


4.2.22 Power control PwrDecrLimit

Table 4-23 Power control PwrDecrLimit

Full name Power control PwrDecrLimit

Abbreviation pwrDecrLimit

Description

This parameter is set for preventing MS from call drop due to

fast power control. It corresponds to different quality levels. For

example, PwrDecrLimit [0] determines the maximum power

decrease limit for calls with receiving quality level 0 (Bit Error

rate (BER) <0.2%). This parameter is valid for both uplink and

downlink.






Value range 0..38

Unit NoneDefault value [24,22,20,18,16,14,12,10]

4.2.23 Report period of measurement for power control

Table 4-24 Report period of measurement for power control

Full name Report period of measurement for power control

Abbreviation pwrCtrlReportPrd

Description

Power control is performed at BTS side and BSC implements

relevant performance statistics. BTS uses this parameter to

decide the periodicity to send the preprocessed power

measurement to BSC as an input for power control analysis.

This parameter is in the unit of SACCH multiframe.


Value range 1..254

Unit None

Default value 240

5 Related Counters and Alarms

5.1 Related Counters

Table 5-1 Counters list

Counter ID Name

C901320001 Number of normal increases of MS power due to uplink signal level(Times)

C901320002 Number of rapid increase in MS power due to uplink signal level(Times)

C901320003 Number of normal decrease of MS power due to uplink signal level(Times)

C901320004 Number of rapid decrease in MS power due to uplink signal level(Times)

C901320009 Number of normal increases of MS power due to uplink signal quality(Times)

C901320010 Number of rapid increase in MS power due to uplink signal quality(Times)





C901320011 Number of normal decrease of MS power due to uplink signal quality(Times)

C901320012 Number of rapid decrease in MS power due to uplink signal quality(Times)

C901320023 Total value of power scans of uplink signal level(Times)

C901320024 Number of power scans of uplink signal level(Times)

C901320027 Total value of power scans of uplink signal quality(Times)

C901320028 Number of power scans of uplink signal quality(Times)

5.2 Related Alarms

This feature has no related alarms.

6 Engineering Guide

6.1 Application Scenario

This feature suits for all scenarios.

6.2 Configuration Description

In configuration resources tree window, select Configuration Management->Modify

area->Managed Element->GSM Logical Configuration->Cell Information

Configuration->Power Control ->Uplink power control allowed to enable uplink

power control, as shown below. Others are minor adjustment parameters, which can be

adjusted as per the actual conditions.





Figure 6-1 Configuration Interface





6.3 Feature Validation

6.3.1 UL Power Control ---bad quality

Test Item UL Power Control ---bad quality

Precondition 1. check CN is healthy;

2. check BSC is healthy;

3. check SDR is healthy;

4. check default cell configuration and parameters in

BSC;

5. MSs are ready;

6. ensure good radio environment;

Test Steps 1. Set “Uplink power control allowed” as “On” in Power

Control interface;

2. Set “Uplink rapid power control” as “1” in Power

Control interface;

3. Set the serving cell with at least two TRXs

4. Make a FR call in serving cell, in time slot 0, hold on;

5. Wait a few minutes to observe the power increasing

when quality is bad

6. Save Abis, A interface signal trace, observe the

measurement result and power control indication in

CS signaling trace;

7. Repeat step 4 to 6 in time slot 58. Repeat 4-7 step with HR/AMR FR/ AMR HR call;

Anticipative Result 1. The signaling “power control indication” can be found

in CS signaling trace and the Radio Link Direction of

Power Control is uplink direction.

2. When UL radio quality is bad, UL power dynamic

increase and the increasing step is 2db as default

value;

Test Result 1. UL power control is effective.





Parameters Setting Default parameters

6.3.2 UL Power Control ---low levelTest Item UL Power Control ---low level

Precondition 1. check CN is healthy;

2. check BSC is healthy;

3. check SDR is healthy;

4. check default cell configuration and parameters in

BSC;

5. MSs are ready;

6. ensure good radio environment;

Test Steps 1. Set the cell power control params as default value;2. Set “Uplink power control allowed” as “On” in Power

Control interface;

3. Configure the serving cell with at least two TRXs

4. Make a FR call in serving cell, in time slot 0, hold on;

5. Keep MS away from the BTS , wait a few minutes to

observe the power increasing when UL level is low;

6. Save Abis, A interface signal trace, observe the

measurement result and power control indication in

CS signaling trace;

7. Repeat step 4 to 6 in time slot 5

8. Repeat 4-7 step with HR/AMR FR/ AMR HR call;

Anticipative Result 1. The signaling “power control indication” can be found

in CS signaling trace and the Radio Link Direction of

Power Control is uplink direction

2. When UL level is low, UL power dynamic increase and

the increasing step is 2db as default value;

Test Result 1. UL power control is effective.

Parameters Setting Default parameters




6.4 Feature Turn off

In configuration resources tree window, select Configuration Management->Modify

area->Managed Element->GSM Logical Configuration->Cell Information

Configuration->Power Control ->Uplink power control allowed to close uplink

power control

6.5 Network Impact

Activation of dynamic MS power control can reduce MS transmission power with

stable uplink signal strength, aiming at decreasing intra-network co-channel and

adjacent-frequency interference, lowering MS power consumption and prolonging

the mean up time of MS

7 AbbreviationAbbreviations Full Characteristics

3GPP 3rd

Generation Partnership Project

BSC Base Station Controller

BTS Base Transceiver Station

MR Measure Report

SACCH Slow Associated Control Channel

8 Reference Document

ZXG10 iBSC (V6.30.10) Base Station Controller Performance Counter Reference

ZXG10 iBSC (V6.30.10) Base Station Controller Radio Parameter Reference

zgo-04-02-002 dynamic ms power control feature guide zxg10-ibsc (v12.2.0)20130410_548234

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