AMR Progressive Power Control

1 © Nokia Siemens Networks BSC S13 SW and CX(M)6.0 SW Features / AEG / 240707 /

AMR Progressive Power Control BSS20776

BSC S13 SW and CX(M)6.0 SW Features Course


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AMR Progressive Power Control - Objectives

• After studying this module the trainee will be able to:– Describe the function of the AMR Progressive Power Control feature

– List the benefits of AMR PPC– Understand the operational aspects of AMR PPC– Describe the steps required to activate AMR PPC– Understand the purpose of the 32 new AMR PPC parameters


AMR Progressive Power Control – Pre Introduction• With current power control, voice quality (based on TCH FER) and drop call rate (based on SACCH RLT) cannot be optimised at the same time

• For example RXQUAL low thresholds 5 and high thresholds 6 provides low drop call rate, but poor voice quality.

• As a result, used power control algorithm AMR RXQUAL thresholds have to be selected so that trade-off between voice quality and system capacity is made


AMR Progressive Power Control – Pre Introduction

QualityRxqual BER %

0 <0.2

1 0.2 - 0.4

2 0.4 - 0.8

3 0.8 - 1.6

4 1.6 - 3.2

5 3.2 - 6.4

6 6.4 - 12.8

7 >12.8

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Power level30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Attenuation dB

pc upper threshold dl Rx qual AM R FR (UDRF)pc lower threshold dl Rx qual AM R FR (LDRF)Optim um quality, No need to change transm itting power

Pow er

• In normal Power Control algorithm the quality thresholds for quality based PC are not changing according to actual transmitting power

• Example:


AMR Progressive Power Control - Introduction• Progressive AMR Power Control (AMR PPC) provides mechanism to change quality thresholds depending on used power level i.e. favor increase of power with low power levels and avoid increase of power with higher power levels and thus reduce overall interference

• AMR PPC is an enhancement to the existing Power Control (PC) algorithm running in the BSC and controlling the transmitting power of the MS and BTS

• AMR PPC is application software in S13 and it contains two separate functionalities which can be separately controlled with Licence and Feature Handling MML (LFHMML)

▪ AMR PPC for MS power controlling▪ AMR PPC for BTS power controlling

• AMR PPC algorithm will be used only for AMR calls. When the AMR PPC algorithm is disabled, the normal PC algorithm is used also for AMR calls

• AMR PPC introduces one new measurement type, The AMR PPC Measurement. The new measurement is for measuring the average signal quality vs. power level distribution in TRX level


AMR Progressive Power Control - Concept• Progressive AMR Power Control is introduced inorder to further improve AMR quality and capacity with legacy AMR along with new SAIC phones

• Instead of using constant RX_QUAL threshold values, progressive power control uses higher RX_QUAL threshold values for higher TX power levels

• Progressive power control provokes AMR adaptation to use codec rates progressively along power control range– Better interaction between AMR adaptation and power control by favouring increase of power over AMR adaptation with low power levels and avoid increase of power and favouring AMR adaptation with higher power levels and thus reduce overall interference

Main principle of Progressive Power Control


AMR Progressive Power Control -Description

QualityRxqual BER %

0 <0.2

1 0.2 - 0.4

2 0.4 - 0.8

3 0.8 - 1.6

4 1.6 - 3.2

5 3.2 - 6.4

6 6.4 - 12.8

7 >12.8

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Power level30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Attenuation dB

pc upper threshold dl Rx qual AM R FR (UDRF)pc lower threshold dl Rx qual AM R FR (LDRF)O ptim um quality, No need to change transm itting power

X1 PPC Downlink FR Lower Threshold 1 (= 26 dB)X2 PPC Downlink FR Lower Threshold 2 (= 22 dBX3 PPC Downlink FR Lower Threshold 3 (= 8 dB)X4 PPC Downlink FR Lower Threshold 4 (= 4 dB)

-2-1

-2-1

Output Pow er

+1+2

+1+2

X1 X2 X3 X4

• In AMR PPC algorithm, the algorithm internally changes the thresholds for quality based PC according to AMR PPC parameters and actual transmitting power

• It is possible to define 4 power level points, where power control quality thresholds are changed

• The changes of power control quality thresholds in AMR PPC algorithm are fixed to be -2, -1, 0, +1, +2 depending on the current power level

• Example:


AMR Progressive Power Control -Description• Progressive power control reduces the usage of highest transmitted power levels and thus reduces overall interference

• The figure below shows simulated power distributing changes with current power control and progressive power control

Progressive PC reduces usage of the highest TX power levels.


AMR Progressive Power Control - Benefits• AMR PPC functions as a mechanism that changes quality thresholds depending on the used power level

• As a result AMR PPC favors increase of power with low power levels and avoids increase of power with higher power levels. Following results are striven by this:– Better power distribution introducing less interference to the network

– Better quality distribution yielding to better speech codec distribution

• The aim of this feature is get some capacity gain and decrease the Dropped Call Rate (DCR)


AMR Progressive Power Control - Benefits• Benefits for Operators

– Capex savings and increased end user experience by decreasing the amount of dropped calls significantly while maintaining good voice quality

– Simulation shows 50% reduction in dropped call rate (DCR) or, with the same DCR, traffic increase of 15%

– Gives better balance between AMR codec modes and power control

Gains in Progressive Power Control


AMR Progressive Power Control - Solution Architecture

BSC with S13

software

AMR capable MS

Measurement reports

MS or/and BTS power command

NetAct (OSS 4.2) / MML

AMR PPC parameter handling

AMR capable BTS

•Network architecture– Existing architecture will be used

• Elements involved


AMR Progressive Power Control – Operational Aspects• Valid licence for AMR FR or AMR HR must be installed and one or both of those features must be active before activation of AMR PPC

• AMR PPC introduces 32 new BSC level parameters• AMR PPC is application software in S13 and it contains two separate functionalities which can be separately controlled with Licence and Feature Handling MML

▪ AMR PPC for MS power controlling▪ AMR PPC for BTS power controlling

• AMR PPC algorithm will be used only for AMR calls. When the AMR PPC algorithm is disabled, the normal PC algorithm is used also for AMR calls

• AMR PPC introduces one new measurement type - AMR PPC Measurement. This new measurement is for measuring the average signal quality vs. power level distribution in TRX level

• Network level gains are expected to be at a similar level for both AMR/FR and AMR/HR


AMR Progressive Power Control –HW/SW Requirements & Licensing• BSC HW: no special requirements• BSC SW: S13• BSC Application SW: licence for AMR PPC and licence for AMR FR or/and AMR HR required

• Other NW elements: NetAct OSS4.2• MS requirements: AMR capability


AMR Progressive Power Control - HW/SW Requirements SUPPORTED IN:

GSM1900Y

MSC-

NokiaNetAc

tOSS4.2 2)

SGSN-

NetActPlanne

r-BSCS13

GSM800Y

GSM900Y

GSM1800Y

Nokia 2nd

Gen.N

NokiaTalk-family(Y)

NokiaPrimeSi

teN

NokiaMetroSi

te(Y)

NokiaInSite

N

NokiaUltraSi

te(Y)

SGSNHW/FW

-

TCHW/FW

BTSHW/FW

-

BSCHW/FW

-

BTSMMI-

MSY 1)

BSCMMIY

Operating/

ApplicationApplication

HW/FW DEPENDENCY:

Note(s): 1) AMR capable MS 2) OSS4.2 CD set1 / OSS5 CD set 1

NokiaFlexiEd

ge(Y)


AMR Progressive Power Control – Activation and operation• Valid licence for AMR FR or AMR HR must be installed and

one or both of those features must be active before activation of AMR PPC.

• When valid AMR PPC licence is installed to BSC then the feature states of AMR PPC for UL and AMR PPC for DL can be changed ON, CONF or OFF via platform feature management

– feature code for DL AMR PPC -> fc_t_amr_ppc_dl_c = 578 – feature code for UL AMR PPC -> fc_t_amr_ppc_ul_c = 606– Example: ZW7M:FEA=578:ON;

• Counters of AMR PPC measurement are available after the AMR PPC measurement modification and starting. The measurement can’t be modified or started if both of AMR PPC features (AMR PPC for UL and AMR PPC for DL) are in OFF state. Example: ZTPM:MEASUR,AMR_PPC:ALL,0-0-24-0,60;


AMR Progressive Power Control – External interfaces• Q3 interface

– Handling the new BSC parameters and new measurement type must be supported by Q3


AMR Progressive Power Control – New MML

BASE STATION CONTROLLER PARAMETER HANDLING COMMANDS? ..... DISPLAY MENUM: ..... MODIFY GENERAL BASE STATION CONTROLLER PARAMETERSN: ..... MODIFY RADIO NETWORK SUPERVISION PARAMETERSQ: ..... MODIFY MISCELLANEOUS PARAMETERSU: ..... MODIFY DYNAMIC HOTSPOT PARAMETERS <option>V: ..... MODIFY QUALITY OF SERVICE PARAMETERS <option>T: ..... MODIFY PRIORITY LEVEL TO SUBSCRIBER TYPE RELATION <option>H: ..... MODIFY DFCA PARAMETERS <option>X: ..... MODIFY AMR PPC PARAMETERS <option>R; ..... PREPARE DATABASE FOR DOWNLOADING OF BACKGROUND DATAG: ..... CONTROL ACTIVATION OF BACKGROUND DATAO: ..... OUTPUT BASE STATION CONTROLLER PARAMETERSI: ..... OUTPUT RADIO NETWORK CONFIGURATIONL: ..... OUTPUT TRX RADIO TIME SLOTSP: ..... OUTPUT BACKGROUND DATA ACTIVATION STATESC: ..... CREATE LAC TO SPC MAPPING INFO <option>D: ..... DELETE LAC TO SPC MAPPING INFO <option>F: ..... MODIFY LAC TO SPC MAPPING INFO <option>S: ..... OUTPUT LAC TO SPC MAPPING INFO <option>Z; ..... RETURN TO MAIN LEVEL

•MML Command EEX – MODIFY AMR PPC PARAMETERS

•Example for syntax -> EEX:LDF1=<AMR PPC DL FR Lower Threshold 1>


AMR Progressive Power Control – New Parameters• AMR PPC introduces 32 new BSC level parameters.

AMR PPC for UL AMR PPC for DL

AMR FR AMR HR

Upper quality threshold

Lower qualitythreshold

Upper quality threshold

Lower qualitythreshold

AMR FR

Upper qualitythreshold

UUF1 UUF2 UUF3 UUF4 ULF1 ULF2 ULF3 ULF4 UUH1 UUH2 UUH3 UUH4 ULH1 ULH2 ULH3 ULH4 DUF1 DUF2 DUF3 DUF4

etc…

etc…

etc…

*In picture above, e.g. -> UUF1 == UL Upper Full rate threshold1…


AMR Progressive Power Control – New Parameters• All 32 new AMR PPC parameters are for defining power level points where the PC quality thresholds will changes

• There are 4 power level points e.g. AMR FR Upper Power Control quality threshold for Uplink direction etc.

• Quality thresholds are changed depending on AMR PPC parameter and measured transmitting power, so that they are either reduced by 2 or 1 OR increased by 1 or 2

• Range for all new AMR PPC parameters is from 0 to 15 and it covers power levels from the maximum power level to the minimum power level


AMR Progressive Power Control – New Parameters• Parameters are numbered from 1 to 4

– AMR PPC DL FR Lower Threshold 1– AMR PPC DL FR Lower Threshold 2– AMR PPC DL FR Lower Threshold 3– AMR PPC DL FR Lower Threshold 4

• Example:– If measured BTS transmitting power is smaller than AMR PPC DL FR Lower Threshold 1 -> Power Control Quality threshold for AMR FR is reduced by 2 (LDRF - 2)

OR– If measured BTS transmitting power is smaller than AMR PPC DL FR Lower Threshold 2 -> Power Control Quality threshold for AMR FR is reduced by 1 (LDRF - 1) OR

– If measured BTS transmitting power is bigger than AMR PPC DL FR Lower Threshold 3 -> Power Control Quality threshold for AMR FR is reduced by 2 (LDRF + 1)

OR– If measured BTS transmitting power is bigger than AMR PPC DL FR Lower Threshold 4 -> Power Control Quality threshold for AMR FR is reduced by 1 (LDRF + 2)


AMR Progressive Power Control – Statistics

• New AMR PPC measurement will be introduced for measuring average RX quality class per transmitting power class distribution

• Measurement consists of Rx quality sum counters separately for uplink and downlink

• For each RX quality sum counter there is a sample number counter (denominator) indicating the numbers of samples in each RX quality class sum counter

• There are 4 counters for each transmitting power class (0-15)• Counters can be utilized in post processing for calculating the actual average values by dividing the sum counter with amount of samples

• Also counters for serving BTS, serving TRX, frequency of the serving TRX, frequency group and service area information (normal or extended) exist, hence AMR PPC measurement has a total of 69 counters

• Counters are updated only in case of AMR FR and AMR HR calls• The object level of AMR PPC measurement is TRX ID• RCSPRB updates counters during AMR calls


Appendix


AMR Progressive Power Control - Solution Implementation

LFHMLL

Licence Management

FileLIKEYF

Licence Management Program BlockLMNPRO

Feature Management Partner Program Block

FMPPRBEvent Forwarding

service Ordering LibraryEFILIB

Licence Management LibraryLMXLIB

Feature Management LibraryFMNLIB

XML Licence Files

XMLLIB

Other involved PRB’s

RCSPRB

• Licence and feature handling


AMR Progressive Power Control - Solution Implementation

MCMU

PUBDAT

ROLLERBSDATA

GUPDAT

BSCU

RCSPRBOMU

PUMPRB

RCGSTA

RNW MML’sNetAct

PBCHAN

N04OCH

Q3

N13OCH

HSMMML

• Parameter handling for BSC -level parameters and measurement handling:


AMR Progressive Power Control – How to test• AMR FR feature must be active in the BSC before AMR PPC algorithm can be used for AMR FR calls and AMR HR feature must be active in the BSC before AMR PPC algorithm can be used for AMR HR calls

• Validation tests for new radio network parameters (in case of Plan Provisioning) are not done in FT phase, so this functionality must be tested extra carefully in MT phase

• It must be tested that the new parameters related to this feature are invisible if there are no valid AMR PPC and AMR licences

• It must be tested that the BSDATA has the default values of new parameters for BSC object after upgrade to S13 level BSC SW

• It must be tested that MS power is controlled according AMR PPC related parameters in case of AMR call. I must also be tested that new MS power level after MS power control triggering is calculated according AMR PPC algorithm

• It must be tested that BTS power is controlled according AMR PPC related parameters in case of AMR call. It must also be tested that new MS power level after MS power control triggering is calculated according AMR PPC algorithm


AMR Progressive Power Control – How to test• Functionality and handling of the new measurement AMR PPC must be tested

• It must be tested that normal PC algorithm is used for AMR calls if AMR PPC feature state is changed to ‘CONF’ or ‘OFF’. When both, AMR PPC for DL and AMR PPC for UL feature states are changed to ‘OFF’ also AMR PPC measurement stops automatically (If it has been activated before)

• It must also be tested that AMR PPC algorithm for certain direction (UL/DL) can be disabled separately so that normal PC algorithm is used for disabled direction

Documents

AMR Progressive Power Control