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Page 1: 3-Omo112020 Bsc6000 Gsm v9r8c12 Multiple Rate Algorithm Issue1.00

www.huawei.com

Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.

英文标题 :40-47pt

副标题 :26-30pt

字体颜色 : 反白内部使用字体 :

FrutigerNext LT Medium

外部使用字体 : Arial

中文标题 :35-47pt

字体 : 黑体 副标题 :24-28pt

字体颜色 : 反白字体 : 细黑体

GSM Multiple Rate Algorithm

Page 2: 3-Omo112020 Bsc6000 Gsm v9r8c12 Multiple Rate Algorithm Issue1.00

Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page3

Objectives

Upon completion of this course, you will be able to:

Understand the multiple rate algorithm function and

types.

Master the parameters of multiple rate algorithm.

Be able to configure the data of multiple rate

algorithm.

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page4

Full Rate

Traffic Channel (TCH) carries coded voice data. The full-

rate TCH is initially adopted to carry information at the

gross rate 22.8Kbit/s. The information contains the source

coding rate of 13Kbit/s.

As technologies develop, the enhanced full rate, half rate,

multiple rate and other coding are introduced.

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page5

Speech Version

Speech version indicates the voice coding

technology.

Full RateFull Rate

Speech

Version1FR

Speech

Version2EFR

Speech

Version3AMR

Half RateHalf Rate

Speech

Version1HR

Speech

Version2/

Speech

Version3AMR

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page6

Circuit Pool Function

“Circuit pool number” actually represents the circuit

type, indicating the support capability of the voice

codec.

Different circuit pool numbers can support different

voice rates.

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page7

Circuit Pool FunctionCircuit Pool

NumberSupported Rate

1FR speech version 1 ; FR data (12, 6, 3.6 Kbps)

2HR speech version 1 ; HR data (6, 3.6 Kbps)

3

FR speech version 1 ; FR data (12, 6, 3.6 Kbps) ;HR speech version 1 ; HR data (6, 3.6 Kbps)

4FR speech version 2 ; FR data (12, 6, 3.6 Kbps)

5FR speech version 1 ; FR speech version 2FR data (12, 6, 3.6 Kbps)

6

FR speech version 2 ; FR data (12, 6, 3.6 Kbps)HR speech version 1 ; HR data (6, 3.6 Kbps)

7

FR speech version 1 ; FR speech version 2FR data (12, 6, 3.6 Kbps) ; HR speech version 1HR data (6, 3.6 Kbps)

Circuit Pool Number

Supported Rate

23FR speech version 3 ; HR speech version 3

24FR speech version 3 ; FR data (12, 6, 3.6 Kbps)HR speech version 3

25

FR speech version 1 ; FR speech version 2FR speech version 3 ; FR data (12, 6, 3.6 Kbps)HR speech version 3

27

FR speech version 1 ; FR speech version 2FR speech version 3 ; FR data (12, 6, 3.6 Kbps)HR speech version 1 ; HR speech version 3HR data (6, 3.6 Kbps)

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page8

Call Signaling ProcessingBSC

ASS REQ

Channel ACT

Channel ACT ACK

ASS CMD

SABM

UAEST IND

ASS CMPASS CMP

MS MSCBTS

Setup

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page9

Call Signaling MessageSetup Message

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page10

Call Signaling MessageASS REQ Message

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page11

Call Signaling MessageChannel Act Message

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page12

Call Signaling MessageASS CMD Message

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page13

Call Signaling MessageASS CMP Message

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page14

Contents

1. EFR

2. HR

3. AMR

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page15

The Function of EFR The Enhanced Full Rate (EFR) is a speech coding scheme

with an enhanced full rate. Using this coding scheme, you can provide services with better speech quality.

In the wireless communications system, the EFR applies to only speech services and is irrelevant to data services or signaling services.

The EFR function adopts the CELP( Code Excited Linear Predictive Coding) coding scheme, thus improves the quality of the speech signal.

When EFR is adopted, the transmission rate of the

speech signal of an MS on the air interface is 12.2 kbit/s.

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page16

EFR Call Set-up Flow

Common call (FR)

EFR call

Speech version in theassignment request is EFR

Start

Finish

Yes

NoWhether support EFRin the current cell?

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page17

Call Signaling MessageChannel Act Message

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page18

Call Signaling MessageASS CMD Message

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page19

Call Signaling ProcessingASS CMP Message

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page20

EFR Data Configuration Configure “Cell Attributes/Call Control/Advanced/Access

Control /Speech Version”

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page21

Contents

1. EFR

2. HR

3. AMR

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page22

The Function of HR The half rate voice coding uses a new voice coding algorithm

called VCELPVCELP ( (Vector-Sum Excited Linear PredictionVector-Sum Excited Linear Prediction) ) to

reduce the voice coding rate to half that of full rate voice

service. Thus, one physical channel that can only support one

call under the full rate can support two calls under half rate.

If the half rate service is used, the voice capacity expands

twice without adding TRXs. By adopting half rate service, the

operator can fully use the current network to expand the

system capacity. This saves the cost and eases the spectrum

use.

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page23

The Function of HR

T T T T T T T T T T T S T T T T T T T T T T T T IT

T T T T T T S T T T T T T

t t t t t t t t t t t t s

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page24

The Function of HR

Single : When a timeslot is used as two TCH/H channels, one

TCH/H channel is busy and another is idle, this idle

TCH/H channel is called single channel or channel

fragment or fragment.

Idle Busy

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page25

The Function of HR Couple : When a timeslot is used as two TCH/H

channels, and these two channels are both free,

this timeslot is called a couple.

Idle Idle

Busy Busy

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page26

The Function of HR

I: Idle B : Busy

I B B B B B B BBIB BB B BB

I I B B B B B BBBB BB B BB

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page27

Channel Assignment Strategies If the half rate function is used, when BSC receives the

“assignment request” from the MSC, it will decides to use the

channel allocation algorithm according to channel

assignment strategy specified in the data configuration.

MSC channel assignment strategy

Assign the channel according to the MSC request. If the request from

MSC is "TCHF preferred", assign the full rate channel preferentially. If it

is "TCHH preferred", assign the half rate channel preferentially.

BSC channel assignment strategy

When the assignment request sent from MSC is "Full rate TCH

preferred" or" Half rate TCH preferred", BSC assigns the proper

channel according to the availability of idle full rate channel in the cell

and the allowance of MSC.

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page28

Channel Assignment Strategies The BSC channel allocation strategy is the default strategy.

That is, when the network is idle, the full rate is used,

otherwise, the half rate is used.

For the call that uses the half rate preferentially, the single

channel is assigned preferentially to reduce the fragment.

If a cell has multiple TRXs, the channels on the TRXs that

do not allow the rate adjustment are assigned

preferentially.

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page29

Rate Adjustment Flow If the channel assignment request is to choose the full rate

channel only:

When there is idle full rate channel, assign the channel directly.

When there is no idle full rate channel in the cell, but there is idle

couple channel, convert the couple channel to full rate channel and

then assign the converted full rate channel.

When there is no idle full rate channel and idle couple channel in

the cell, but there is idle single channel, check whether the number

of single channel in the cell is more than one. If yes, initiate

intracell handover to form a couple channel and then convert the

couple channel to full rate to assign.

Otherwise, reject the assignment request.

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page30

Rate Adjustment Flow

Yes

Yes

Yes

No

No

No

Assignment requestfor TCHF only

Full rate available?

Couple channelavailable?

More than one halfrate channel?

Request reject

Assign full rate channel

Convert couple channel to fullrate channel and then assign

the converted channel

Initiate intra-cell handover toform couple channel, and thenconvert the couple channel to

full rate channel to assign

Start

End

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page31

Rate Adjustment Flow If the channel assignment request is to half rate only :

When there is idle single channel in the cell, assign the idle half rate

channel on the single channel directly.

When there is no idle single channel in the cell, but there is idle

couple channel in the cell, assign the idle half rate channel on the

couple channel.

When there is no idle single channel and idle couple channel in the

cell, but there is idle full rate channel in the cell, convert the full rate

channel into couple channel and then assign the idle half rate

channel on the couple channel.

Otherwise, reject the request.

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Rate Adjustment Flow

Yes

Yes

Yes

No

No

No

Half rate only assignment request

Single channel available?

Couple channel available?

Full rate channel available?

Assignment fails

Assign half rate channel

Assign the half rate channelon the couple channel

Convert the full rate channel into couple channel and then assign the half rate channel on it

Start

End

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page33

Rate Adjustment Flow If the channel assignment request is to choose the full rate

channel preferentially:

When there is idle full rate channel in the cell, assign it directly.

When there is no idle single channel in the cell, but there is idle

couple channel in the cell, convert the couple channel into full rate

channel and then assign it.

When there is no idle full rate channel and couple channel in the cell,

check whether the number of adjustable half rate channel in the cell is

more than one. If yes, initiate intracell handover to form a couple

channel and then convert the couple channel to full rate to assign

Otherwise, assign the idle half rate channel on the single channel.

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Rate Adjustment Flow

Yes

Yes

No

No

No

Yes

Assign request for full rate preferentially

Full rate available?

Couple channel available?

More than one half rate channel?

Assign full rate channel

Convert the couple channel into full rate channel to assign

Form couple channel by intracell handover and then convert couple channel into full rate to assign

Start

End

Assign half rate channel

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page35

Rate Adjustment Flow If the channel assignment request is to half rate preferentially:

When there is idle single channel in the cell, assign the idle half rate

channel on the single channel directly.

When there is no idle single channel in the cell, but there is idle

couple channel in the cell, assign the idle half rate channel on the

couple channel.

When there is no idle single channel and idle couple channel in the

cell, but there is idle full rate channel in the cell, convert the full rate

channel into couple channel and then assign the idle half rate

channel on the couple channel.

Otherwise, assign the idle full rate channel.

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page36

Rate Adjustment Flow

Yes

Yes

Yes

No

No

No

Prefer half rate assignment request

Single channel available?

Couple channel available?

Full rate channel available?

Assignment TCH/F

Assign half rate channel

Assign the half rate channelon the couple channel

Convert the full rate channel into couple channel and then assign the half rate channel on it

Start

End

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page37

Call Signaling MessageChannel Act Message

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page38

Call Signaling MessageASS CMD Message

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page39

Call Signaling MessageASS CMP Message

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page40

HR Data Configuration Configure “Site Attributes\multiplexing mode”(1:1 or 2:1 is

recommended)

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page41

HR Data Configuration Configure “Call Control\Advanced\Access Control”

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page42

HR Data Configuration Configure “Cell Attributes\Other Parameter\Public Channel

Control\ Support Half Rate”

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page43

HR Data Configuration Configure “Cell Attributes\TRX Attributes\Channel

Attributes\ Channel Type”

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page44

HR Data Configuration Configure “Cell Attributes\TRX Attributes\Device

Attributes\ TCH Rate Adjust Allow”

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page45

HR Data Configuration Configure “Cell Attributes\Channel Parameter\Basic Channel

Management Parameters\Enhanced TCH Adjust Allowed”

Configure “Cell Attributes\Channel Parameter\Advanced\TCH Traffic Busy Threthold”

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page46

HR Data Configuration

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page47

HR Data Configuration

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page48

HR Data Configuration

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page50

Contents

1. EFR

2. HR

3. AMR

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page51

Contents

3. AMR

3.1 AMR Overview

3.2 AMR Impact on the Network Quality

3.3 AMR Call&Handover Procedure and Parameter

Introduction

3.4 AMR Optimization and Maintenance Strategy

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page52

AMR Overview AMR (Adaptive Multi Rate) is a new voice coding technique

after EFR, FR, and HR.

Its core thought is to automatically select appropriate codec

algorithm and constantly select the voice coding rate

according to change of the uplink/downlink signal quality.

BER

MOS

Codec1

Codec2

Codec3

AMR

Different codec algorithms

produce voice code streams

in different rates so as to get

the optimal balance between

voice quality and system

capacity.

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page53

AMR Overview AMR is a collection of multiple voice codec algorithms. AMR

allows the BTS and the MS to select appropriate codec algorithms

according to the actual situation of the radio environment.

AMR is applicable only to the voice service of the wireless

communication system. It is not related to data service and

signaling service.

You need to obtain license to use AMR. The license is applied on

one cell.

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page54

AMR Overview AMR Voice Coding Mode (Rates)

Full-rate AMR supports eight voice

coding modes.

Half-rate AMR supports five voice

coding modes.

AMR Activated Voce Coding Set

(ACS)

ACS defines the set of changes of

the voice coding rates during a

call. This set contains one~four

coding modes.

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page55

AMR FRExperiment 1a - Test Results

1.0

2.0

3.0

4.0

5.0

Conditions

M OS

EFR12.210.27.957.46.75.95.154.75

EFR 4.01 4.01 3.65 3.05 1.53

12.2 4.01 4.06 4.13 3.93 3.44 1.46

10.2 4.06 3.96 4.05 3.80 2.04

7.95 3.91 4.01 4.08 3.96 3.26 1.43

7.4 3.83 3.94 3.98 3.84 3.11 1.39

6.7 3.77 3.80 3.86 3.29 1.87

5.9 3.72 3.69 3.59 2.20

5.15 3.50 3.58 3.44 2.43

4.75 3.50 3.52 3.43 2.66

No Errors C/I=16 dB C/I=13 dB C/I=10 dB C/I= 7 dB C/I= 4 dB C/I= 1 dB

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AMR HR

1.0

2.0

3.0

4.0

5.0

Conditions

MOS

EFR7.957.46.75.95.154.75FRHR

EFR 4.21 4.21 3.74 3.34 1.58

7.95 4.11 4.04 3.96 3.37 2.53 1.60

7.4 3.93 3.93 3.95 3.52 2.74 1.78

6.7 3.94 3.90 3.53 3.10 2.22 1.21

5.9 3.68 3.82 3.72 3.19 2.57 1.33

5.15 3.70 3.60 3.60 3.38 2.85 1.84

4.75 3.59 3.46 3.42 3.30 3.10 2.00

FR 3.50 3.50 3.14 2.74 1.50

HR 3.35 3.24 2.80 1.92

No Errors C/I=19 dB C/I=16 dB C/I=13 dB C/I=10 dB C/I= 7 dB C/I= 4 dB

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Contents

3. AMR

3.1 AMR Overview

3.2 AMR Impact on the Network Quality

3.3 AMR Call&Handover Procedure and Parameter

Introduction

3.4 AMR Optimization and Maintenance Strategy

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page58

Impact of AMR on Network Quality(1) Impact of AMR on Voice Quality

According to the simulation result, when C/I is greater than

6, the voice quality performance in descending order is FR

AMR, EFR, HR AMR, FR, and HR. It can be seen that AMR can

effectively improve network quality.

The voice quality performance of HR AMR is the similar to

FR, However, radio bandwidth occupied by HR AMR in the

Um interface is only half of that of FR. Therefore, HR AMR

can not only ensure the good voice quality, but also

increase the system capacity effectively.

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Impact of AMR on Network Quality(2) Impact of AMR on Network Coverage

AMR Network Coverage Performance

AMR has excellent anti-interference capability. Under the same

FER, AMR supports lower CIR than non-AMR. Therefore AMR has

better coverage performance.

AMR Coverage Bottleneck

In the actual coverage capability of AMR is determined by the

coverage capability of the SACCH.

In application, the data——[RLT] and [SACCH Multi-Frames] should

be set to higher values for AMR channels to increase the

robustness of the SACCH. Thus the network coverage performance

of AMR is improved and the call drop rate is reduced.

Enhanced signaling link technique is available to improve it.

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Impact of AMR on Network Quality(3) Impact of AMR on the Network Capacity

AMR can equivalently increase the total spectrum bandwidth of the Radio System

AMR can tolerate lower C/I. With AMR, the number of cells in a single frequency reuse cluster is smaller and the spectrum reuse degree is higher, compared with non-AMR.

AMR can reduce the radio bandwidth for a single user When HR AMR is used, the number of channels doubles, while the voice quality does

not drop obviously.

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Impact of AMR on Network Quality(4) Impact of AMR on KPIs

Traffic volume

The voice codec of AMR has low requirement for CIR, so in weak coverage areas

where calls could not be made before, AMR calls can be made, thus reducing

the possibility of user’s hang-up. Therefore, AMR can improve network traffic

volume.

Call drop rate

AMR only optimizes the performance of the voice frames. In weak coverage

areas, because voice frames can be correctly decoded, users will not hand up a

phone, however, because the SACCH frames cannot be correctly decoded, the

RLT times out, leading to call drop. Therefore with AMR, the call drop rate can

rise, while enhanced signaling link technique is available to improve it.

Handover

AMR increases the width and depth of the network coverage. But C/I is low in

these weak coverage areas and the receive quality in the measurement report

is poor, triggering BQ handover. Therefore with AMR, the number of BQ

handovers can rise.

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Contents

3. AMR

3.1 AMR Overview

3.2 AMR Impact on the Network Quality

3.3 AMR Call&Handover Procedure and Parameter

Introduction

3.4 AMR Optimization and Maintenance Strategy

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page63

AMR Call&Handover Procedure and Data Configuration In the BSC6000, the following AMR parameters need to be set

1. AMR basic data parameters

2. ACS and starting mode

3. Coding rate adjustment threshold and hysteresis (full rate)

4. Coding rate adjustment threshold and hysteresis (half rate)

5. Radio link timeout (RLT) and SACCH Multi-Frames

6. AMR radio channel management parameters

7. AMR handover parameters

8. AMR power control parameters

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AMR Parameter Introduction(1)1. AMR basic data

parameters

To active AMR, enable

“full-rate speech coding

algorithm 3” and “half-

rate speech coding

algorithm 3” on the MSC

side.

In addition, configure the

corresponding interface

flag as GSM_PHASE_2+.

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AMR Parameter Introduction(1)1. AMR basic data parameters

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AMR Call Set-up Procedure

Y

Finishes AMR call set up

BSC decides whether to support AMR function

Normal CallN

BSC receives the assigning request sent by MSC

BSC decides whether to assign channel that

supports AMR function

Relationship between voice type and voice version

FR : Full rate /speech version 1EFR: Full rate /speech version 2FR AMR : Full rate /speech version 3

HR : Half rate /speech version 1 HR AMR : Half rate /speech version 3Normal Call

N

Y

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Call Signaling MessageChannel Act Message

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Call Signaling MessageASS CMD Message

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Call Signaling MessageASS CMP Message

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AMR Parameter Introduction(2)

2. ACS and Starting Mode

ACS should be set basing on the actual radio

environment. However, because of the complexity of

the actual radio environment and the randomness of

users' behaviors, not all of the coding modes can be

listed. Generally, the worst coding mode, the best

coding mode, and two coding modes between them

are selected.

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AMR Parameter Introduction(2)

01

23

2. ACS and Starting Mode

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AMR Parameter Introduction(2)

012

2. ACS and Starting Mode

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AMR Parameter Introduction(3)3. Coding Rate Adjustment Threshold and Hysteresis

(FR)

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AMR Parameter Introduction(4)4. Coding Rate Adjustment Threshold and Hysteresis

(HR)

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AMR Parameter Introduction(4) Principles of AMR Codec Mode Adjustment

The criteria for conversion of the voice codec mode is CODEC MODE 1~4

corresponding to THR_1~3 and HYST1~3

Assume that the active codec mode is CODEC_MODE_3 for example. When C/I is

greater than THR_3+HYST_3, the codec mode is switched to CODEC_MODE_4;

when C/I is smaller than THR_2, the codec mode is switched to CODEC_MODE_2

CODEC_MODE_4

CODEC_MODE_3

CODEC_MODE_2

CODEC_MODE_1

C/I

THR_1 + HYST_1 = THR_MX_Up(1)

THR_1 = THR_MX_Dn(2)

THR_2 = THR_MX_Dn(3)

THR_2 + HYST_2 = THR_MX_Up(2)

THR_3 = THR_MX_Dn(4)

THR_3 + HYST_3 = THR_MX_Up(3) The adjustment of the practical voice codec rate can only changes step by step, while can not jump over several steps for sudden changing of C/I

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Principle of AMR Coding Mode Adjustment The uplink coding mode is detected by the BTS.

If the BTS discovers that the configured threshold is achieved, it initiates “Coding Mode Change” command.

After the conversion of the coding mode is completed, the MS responds with a “Coding Mode Indication” message.

AMR ( FR/HR ) UL Codec Mode Adjustment

Coding Mode Change

Coding Mode Indication

BTS detects that RQI reaches the threshold

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Principle of AMR Coding Mode Adjustment The downlink coding is detected by the MS(The same algorithm

is used).

When the MS detects that the threshold is achieved, it initiates

“Coding Mode Request”.

The BTS either ignores or immediately responds to the request

depending on the actual situation.

Upon completion, the BTS sends a “Coding Mode Indication”

message to the MS.

Coding Mode Request

Coding Mode Indication

MS detects that RQI reaches the threshold

AMR ( FR/HR ) DL Codec Mode Adjustment

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AMR Parameter Introduction(5)5. Radio Link Timeout (RLT) and SACCH Multi-Frames

To increase the robustness of the SACCH channel, to

improve the AMR network coverage performance, and

to lower the call drop rate, in practice the RLT and

SACCH Multi-Frames should be set higher.

On the other side, Enhanced Signaling Link

Technique is available to improve it.

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Enhanced Signaling Link Technique

Repeated Downlink

FACCH – Improve the probability of

the MS receiving the FACCH

frames in the poor radio

enviroment

Repeated SACCH

– Improve the robustness of

SACCH links

BSC Version: BSC6000V9R8C12

BTS Version: BTSV3R8C03

MS Version: The MS that supports 3GPP R6

Repeated ACCH consists of Repeated Downlink FACCH and Repeated SACCH

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Enhanced Signaling Link Technique Repeated Downlink FACCH Technical Principle

Enable BSS to transmit the FACCH frames repeatedly when the

measurement result of the downlink link is lower than the threshold

configured.

The repetition mechanism is as follows

0 1 2 3 4 5 6 7 8 9 10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

F S IFF F

resentresent

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Enhanced Signaling Link Technique Implementation of Repeated

Downlink FACCH Technical

1. Enable the cell-level switch

“Repeated Downlink FACCH ”

and configure “Repeated

Downlink FACCH Threshold”

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Enhanced Signaling Link Technique Implementation of Repeated Downlink FACCH Technical

2. BSC decodes the capability of the MS support” Repeated

ACCH ”, and then informs BTS about the Repeated ACCH

Capability of the MS via “Channel Active” message when

activizing TCH channel.

3. BTS determines whether to start to send repeated FACCH

messages by comparing the receive quality provided in the

downlink MR and the “Repeated Downlink FACCH

Threshold”.

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Enhanced Signaling Link Technique Repeated SACCH Technical Principle

Add SRO(SACCH Repetition Order) indication bit on the downlink

SACCH, and SRR(SACCH Repetition Request) indication bit on the uplink

SACCH.

Upon the failure to decode an SACCH frame, BTS sets the SRO to 1,

requesting MS to resend the SACCH frame.

Upon the failure to decode an SACCH frame, MS sets the SRR to 1,

requesting BTS to resend the SACCH frame.

SRO

SRR

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Enhanced Signaling Link Technique Implementation of Repeated

SACCH Technical

1. Enable the cell-level switch

“Repeated Downlink FACCH ”

2. BSC decodes the capability of

the MS support” Repeated

ACCH ”, and then informs BTS

about the Repeated ACCH

Capability of the MS via

“Channel Active” message

when activising TCH channel.

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Enhanced Signaling Link Technique Implementation of Repeated SACCH Technical

3. Suppose MS supports ”Repeated ACCH Capability”

when BTS receives the uplink SACCH frame in which SRR=1, the

BTS will resend SACCH frames excluding short message until

SRR=0

If BTS fails to decode an uplink SACCH, BTS sets SRO=1,

requesting MS to resend the uplink SACCH frame until SRO=0

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AMR Parameter Introduction(6)6. AMR Radio Channel Management Parameters

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AMR Parameter Introduction(7)

7. AMR Handover Parameters

AMR handover is the intra-cell handover between FR AMR and HR

AMR.

Via HR-FR channel conversion, which is based on RQI and channel

occupation ratio, control strategy for balancing between the capacity

and quality of the cell is provided.

When configure the handover parameters, [AMR TCH/H Prior

Allowed] and [AMR TCH/H Prior Cell Load Threshold] should

be taken into account.

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AMR Handover Procedure AMR handover refers to the intra-cell handover between FR AMR and HR AMR

basing on the RQI.

The AMR handover provides control strategy of capacity-quality balance within a

cell.

The AMR handover is implemented through the intra-cell handover procedure.

If in P seconds of N seconds:RQI > [F2H HO Threshold], then intra-cell handover indication from FR AMR to HR AMR is initiated;

RQI < [H2F HO Threshold], then intra-cell handover indication from HR AMR to FR AMAR is initiated.

Relationship between RQI and C/I : RQI = 2*C/I

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AMR Handover ProcedureBegin

Is [Intracell F-H HO Allowed] Yes ?

Yes

Is current channel TCH & version3?

No

A: Cell load > [AMR TCH/H Prior

Cell Load Threshold]

During [Penalty Time

after AMR TCHF-H HO

Fail(s)]?

Yes

Yes

Is current channel FR?

Satisfy P/N rule?Trigger internal

cellAMR handover

Yes

NoEnd

RQI/2 >[F2H HO th] & A

RQI/2 <[H2F HO th] End

Yes Yes

NoNo

No

No

No

Yes

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AMR Parameter Introduction(7)7. AMR Handover Parameters

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AMR Parameter Introduction(7)7. AMR Handover Parameters

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AMR Parameter Introduction(8)8. AMR Power Control Parameters

Different power control thresholds are set for AMR calls and non-AMR calls. AMR calls are transmitted in lower power than non-AMR calls.

The setting principles are as follows: Set lower “AMR UL/DL RX_LEV Upper/Lower Threshold” for AMR calls

than those for non-AMR calls.

Set higher “AMR UL/DL Qual. Upper/lower Threshold” for AMR calls than those for non-AMR calls.

Keep other AMR power control parameters consistent with normal power control parameters.

In practice, need to consider the setting of normal power control parameters to adjust the AMR power control parameters.

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AMR Parameter Introduction(8)8. AMR Power Control Parameters

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AMR Parameter Introduction(8)8. AMR Power Control Parameters

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Contents

3. AMR

3.1 AMR Overview

3.2 AMR Impact on the Network Quality

3.3 AMR Call&Handover Procedure and Parameter

Introduction

3.4 AMR Optimization and Maintenance Strategy

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AMR Optimization&Maintenance Strategy(1)

No. Performance Counters

1 Speech Version 1 Completed Assignments(Excluding Directed Retry)(TCHF)

2 Speech Version 2 Completed Assignments(Excluding Directed Retry)(TCHF)

3 Speech Version 3 Completed Assignments(Excluding Directed Retry)(TCHF)

4 Speech Version 1 Completed Assignments(Excluding Directed Retry)(TCHH)

5 Speech Version 2 Completed Assignments(Excluding Directed Retry)(TCHH)

6 Speech Version 3 Completed Assignments(Excluding Directed Retry)(TCHH)

Half rate speech version 2 actually does not exist. Therefore the half rate speech

version 2 TCH assignments (excluding direct retry) should be always zero

Traffic Statistics–AMR Call Ratio Calculation

If you need to calculate AMR (speech version 3) call ratio,

according to the number of TCH assignment successes of

various speech versions under full rate/half rate.

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AMR Optimization&Maintenance Strategy(2)

Adding cell-level AMR call counters.

Cell-level AMR call counters are added in the Call

Measurement.

Radio quality indication (RQI) performance statistics

TRX-level RQI performance statistics function by TA

distribution is provided.

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Summary

In this course , we have learned : The function of EFR, HR, AMR

The signaling assignment flow of EFR, HR, AMR

Data configuration of EFR, HR, AMR

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