AMRPROGRESSIVE POWER CONTROL.pdf

AMR Progressive Power Control

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# Nokia Siemens Networks 1 (15)

BSC3153Nokia GSM/EDGE BSS, Rel. BSS13, BSC andTCSM, Rel. S13, Product Documentation, v.1

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2 (15) # Nokia Siemens Networks DN70383727Issue 1-0 en15/03/2008


Contents

Contents 3

1 Overview of AMR Progressive Power Control 5

2 Technical description of AMR Progressive Power Control 7

3 Functionality of AMR Progressive Power Control 9

4 User interface of AMR Progressive Power Control 13

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Contents



1 Overview of AMR Progressive PowerControl

With the current power control algorithm, voice quality and dropped callrate cannot be optimised at the same time. This means that the receivedsignal quality (RXQUAL) thresholds have to be selected so that a trade-offbetween voice quality and system capacity is achieved.

AMR Progressive Power Control (PPC) provides a mechanism to changethe RXQUAL thresholds for AMR calls depending on the used power level.In other words, it is possible to favour power increase with low powerlevels and avoid it with higher power levels, thereby reducing overallinterference.

AMR PPC (BSS20776) is a licence-based application software productthat consists of two separately controlled functionalities:

. AMR PPC for MS power control (uplink)

. AMR PPC for BTS power control (downlink)

If the licence expires, the normal power control algorithm is used also forAMR calls.

Benefits of AMR Progressive Power Control

. reduced interference in the network because of better powerdistribution

. better speech codec distribution because of better qualitydistribution

. reduced dropped call rate

Related topics

. Functional descriptions. Radio network performance

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Overview of AMR Progressive Power Control

. RF Power Control and Handover Algorithm

. Feature descriptions. Radio network performance

. Enhanced Speech Codecs: AMR and EFR

. Install and upgrade. Software

. Licensing in BSC

. Test and activate. Radio network performance

. Activating and Testing BSS20776: AMR ProgressivePower Control

. Reference. Commands

. MML commands. EE - Base Station Controller Parameter Handling

in BSC. Counters/performance indicators

. Call control measurements (CS). 111 AMR PPC Measurement

. Parameters. BSS Radio Network Parameter Dictionary



2 Technical description of AMRProgressive Power Control

Software requirements

Table 1. Required software

Network element Software release required

BSC S13

Nokia Flexi EDGE BTSs No requirements.

Nokia UltraSite EDGE BTSs No requirements.

Nokia MetroSite EDGE BTSs No requirements.

Nokia Talk-family BTSs No requirements.

Nokia InSite BTSs Not supported.

MSC/HLR No requirements.

SGSN No requirements.

Nokia NetAct OSS4.2

Table Required software shows the earliest version that supports AMRProgressive Power Control (PPC).

Hardware requirements

Table 2. Required hardware

Network element Hardware requirements

BSC No requirements.

BTS No requirements.

TCSM No requirements.

SGSN No requirements.

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Technical description of AMR Progressive Power Control

Frequency band support

The BSC supports AMR Progressive Power Control on the followingfrequency bands:

. GSM 800

. GSM 900

. GSM 1800

. GSM 1900

End-user equipment

AMR Progressive Power Control requires an AMR-capable MS.

Interworking

AMR Full Rate (FR) and AMR Half Rate (HR)

Either AMR FR or AMR HR or both must be activated before it is possibleto define the AMR Progressive Power Control parameters for AMR FR orAMR HR calls.



3 Functionality of AMR Progressive PowerControl

AMR Progressive Power Control (PPC) enables you to define four differentpower level points in which the quality thresholds are changed comparedto the ones used in the existing power control algorithm for AMR calls.

The threshold changes are fixed as follows:

. -2 between minimum output power and point 1

. -1 between points 1 and 2

. +1 between points 3 and 4

. +2 between point 4 and maximum output power

You can define these points separately for AMR FR and AMR HR, and inthe downlink and uplink direction.

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Functionality of AMR Progressive Power Control

Figure 1. AMR Progressive Power Control

Using AMR FR in the downlink direction as an example, the algorithm fordefining the lower threshold with the four relevant AMR PPC parametersand the current pc lower threshold DL Rx qual AMR FR (LDRF)parameter is as follows:

. If the measured BTS transmitting power is smaller than AMR PPC DLFR Lower Threshold 1 (LDF1), the power control qualitythreshold for AMR FR is reduced by two (LDRF - 2)

OR

. If the measured BTS transmitting power is smaller than AMR PPC DLFR Lower Threshold 2 (LDF2), the power control qualitythreshold for AMR FR is reduced by one (LDRF - 1)

OR

. If the measured BTS transmitting power is greater than AMR PPC DLFR Lower Threshold 4 (LDF4), the power control qualitythreshold for AMR FR is increased by two (LDRF + 2)

OR

Rxqual BER%

-2

-2

+2

+2

-1

-1 +1

+1

Output Power

Decrease Power

Increase Power

Quality

0

1

2

3

4

5

6

7

<0.2

0.2-0.4

0.4-0.8

0.8-1.6

1.6-3.2

3.2-6.4

6.4-12.8

>12.8

X1 X2 X3 X4

Power level

Attenuation dB

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0

pc upper threshold dl Rx qual AMR FR (UDRF)

pc lower threshold dl Rx qual AMR FR (LDRF)

optimum quality, no need to change transmitting power

X1

X2

X3

X4

amrPpcDIFrLowerThreshold1






. If the measured BTS transmitting power is greater than AMR PPC DLFR Lower Threshold 3 (LDF3), the power control qualitythreshold for AMR FR is increased by one (LDRF + 1)

Note that the power control quality threshold values are only changedwithin the algorithm during an AMR call. The values of the actualparameters, such as LDRF are not changed.

With AMR PPC, the BSC uses the same Px and Nx values and averagingwindows as with the normal power control algorithm. For more information,see RF Power Control and Handover Algorithm under Functionaldescriptions/Radio network performance in the PDF view.

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Functionality of AMR Progressive Power Control



4 User interface of AMR ProgressivePower Control

MMLs

. Base Station Controller Parameter Handling in BSC (EE)

The following commands are used for handling AMR ProgressivePower Control: EEO, EEX

. Licence and Feature Handling (W7)

Parameters

The following BSC radio network object parameters are used for handlingAMR Progressive Power Control:

AMR FR in the downlink direction:

. AMR PPC DL FR Lower Threshold 1 (LDF1)




. AMR PPC DL FR Upper Threshold 1 (UDF1)




AMR HR in the downlink direction:

. AMR PPC DL HR Lower Threshold 1 (LDH1)


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User interface of AMR Progressive Power Control



. AMR PPC DL HR Upper Threshold 1 (UDH1)




AMR FR in the uplink direction:

. AMR PPC UL FR Lower Threshold 1 (LUF1)




. AMR PPC UL FR Upper Threshold 1 (UUF1)




AMR HR in the uplink direction:

. AMR PPC UL HR Lower Threshold 1 (LUH1)




. AMR PPC UL HR Upper Threshold 1 (UUH1)




Counters

111 AMR Progressive Power Control Measurement contains the countersrelated to AMR Progressive Power Control.



There are two Rx quality sum counters for all transmitting power classes(0-15), one for uplink and one for downlink Rx quality. Every Rx qualitysum counter has a denominator counter that indicates the number of timesthe RX quality class sum counter is sampled. Together these counters canbe used to calculate the average Rx quality for each transmitting powerclass.

Table 3. Counters of 111 AMR Progressive Power Control Measurement

Counter Counternumber

FREQUENCY GROUP ID 111000

RX TRX IN EXTENDED AREA 111001

UL RX QUALITY FOR POWER CLASS 0 111002

UL RX QUALITY FOR POWER CLASS 0DENOMINATOR

111003

DL RX QUALITY FOR POWER CLASS 0 111004

DL RX QUALITY FOR POWER CLASS 0DENOMINATOR

111005

: :

UL RX QUALITY FOR POWER CLASS 15 111062

UL RX QUALITY FOR POWER CLASS 15DENOMINATOR

111063

DL RX QUALITY FOR POWER CLASS 15 111064

DL RX QUALITY FOR POWER CLASS 15DENOMINATOR

111065

For more information, see 111 AMR Progressive Power ControlMeasurement under Reference/Counters/performance indicators in thePDF view.

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User interface of AMR Progressive Power Control

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AMRPROGRESSIVE POWER CONTROL.pdf