AMR Settings Huawei

7/23/2019 AMR Settings Huawei

http://slidepdf.com/reader/full/amr-settings-huawei 1/19

Document Title Security Level:

Overview

The AMR selects an appropriate coding/decoding rate automatically so that the anti-

interference capability of the wireless communication system is enhanced and the speech

quality is improved.

Definition

AMR is an adaptive multi-rate speech coding/decoding algorithm, which is termed full-rate

speech version and half-rate speech version in protocols. The algorithm enables a !T"

and an M" to select an appropriate coding/decoding rate automatically in the specified rate

collection based on the interference conditions of the radio environment so that the anti-interference capability and the speech quality of the wireless communication system can be

enhanced.

AMR is applicable to the speech services in the wireless communication system and is not

applicable to the #" data services or $" services.

Purposes

%n the wireless communication system, if the speech coding rate involved in channel coding is

high, the quantity of the speech feature information carried in the coded code stream is large

and the speech fidelity is high. At the same time, the quantity of redundant information in the

code stream is small and the anti-interference capability of the code stream is poor. %n a poor

wireless communication environment, bit errors occur easily and the speech frames may be

lost thereby. Thus, voices may be intermittent. %f the rate of the speech coding involved in

channel coding decreases, the coded code stream can contain much redundant information.

Then the code stream has strong anti-interference and error correction capabilities. Thus the

continuity of voice can be improved.

The AMR enables a !T" and an M" to obtain the interference status of the radio environment

based on the receive level, receive quality, and carrier-to-interference ratio so that the rate of

the speech coding can be adaptively ad&usted. Thus, the anti-interference capability of the

wireless communication system can be enhanced and the speech quality can be improved.

AMR Calls

The AMR is involved in the following call procedures' the incoming !"# handover procedure,

the outgoing !"# handover procedure, and the intra-!"# handover procedure.

The call procedures are achieved based on the contents described in References.

2016-01-06 HUAWEI Confienti!l "!#e1$ Tot!l1%




Assignment Procedure

The assignment procedure is described as follows'

(. The M"# determines whether an M" supports AMR based on the support capability

of the M", the service type of a call, the speech version supported by the M"#, and the

circuit pool where the circuit on the A interface is located.

). The M"# determines a set of speech versions that are supported by the call and

sends the information on the set to the !"# through an Assignment Request message.

. After receiving the Assignment Request message from the M"#, the !"# determines

whether AMR can be used based on whether the license allows the !"# to use AMR

and whether the A interface tag is $*A"+ ).

. !ased on the intersection of the set of supported speech versions carried in the

Assignment Request message and the speech versions supported by the cell, the !"#

can obtain the candidate speech versions.

. !ased on the candidate speech versions and the types of the assigned channels, the

!"# selects a speech version whose level is the highest for final use.

. %f an AMR speech version is selected, the !"# sends the AMR service parameters to

the !T" through a #hannel Activation message or a Mode Modify command. Then, the

!"# sends the AMR service parameters to an M" through an assignment command or

a #hannel Mode Modify command. After the M" is accessed, the M" reports an

Assignment #omplete message to the M"#. The assignment procedure for an AMR

call is complete.

Incoming BSC Handover Procedure

The incoming !"# handover procedure is described as follows'

(. The M"# determines whether an M" supports AMR based on the support capability

of the M", the service type of a call, the speech version supported by the M"#, and the

circuit pool where the circuit on the A interface is located.

). The M"# determines a set of speech versions that are supported by the call and

sends the information on the set of speech versions to the !"# through an incoming

!"# handover request message.

. After receiving the handover request from the M"#, the !"# obtains the candidate

speech versions based on the intersection of the set of supported speech versions

carried in a handover request and the speech versions supported by a cell.

. !ased on the candidate speech versions and the types of the assigned channels, the

!"# selects a speech version whose level is the highest for final use.





. %f an AMR speech version is selected, the !"# sends the AMR service parameters to

the !T" through a #hannel Activation message. After receiving a #hannel Activation

Ac0nowledge message from the !T", the !"# send a *andover Request

Ac0nowledge message to the M"# and then sends the AMR service parameters to an

M" through a handover command.

Outgoing BSC Handover Procedure

%n the outgoing !"# handover procedure, the !"# determines to initiali1e an outgoing !"#

handover based on the handover decision algorithm and sends a *andover Required

message to the M"#. The message contains the speech version used by the current call.

Intra-BSC Handover Procedure

%n the intra-!"# handover procedure, the !"# determines to initiali1e an intra-!"# handover

based on the !"# handover decision algorithm. According to the saved assignment requests

or the set of the supported speech versions carried in an incoming !"# handover request, a

method is used to determine the speech version for final use. The method is the same as that

is used in the assignment procedure.

2hen a call is an AMR call, the !"# sends the AMR service parameters to the !T" through a

#hannel Activation message, and then sends these parameters to an M" through a handover

command.

Determination of te AMR Speec !ersion

3igure ( shows the procedure for determining the AMR speech version.

3igure ( $rocedure for determining the AMR speech version

2016-01-06 HUAWEI Confienti!l "!#e&$ Tot!l1%




Configuring AMR

#onfigure the AMR through the BSC"### $ocal Maintenance %erminal.

Conte&t

2016-01-06 HUAWEI Confienti!l "!#e'$ Tot!l1%




3or *uawei M"#s, the current !"# is configured as supporting full-rate speech version and

half-rate speech version or is configured as supporting any one of these two versions. 3or

the specific operation, refer to the user manuals related to the M"# products.

Procedure

(. Apply for and activate the license

a. 2hen the license used for half-rate service is applied, you should ensure that

in the BSC6000V900R001 (None) Commercial License Application Template,

the 'um(er of resources corresponding to the 'um(er of te %R)

supporting AMR in the Resource control items column is not #. 4ou should fill

in the actual number of TR5s that has the AMR function.

b. 6n the BSC"### $ocal Maintenance %erminal, activate the license. 3or

details, refer to Activating 7icense.

). #onfigure the A interface tag as *SM+PHAS,+..

a. 6n the BSC"### $ocal Maintenance %erminal, right-clic0 the BSC"###

node on the Management %ree tab page. #hoose Configure BSC Attri(utes

from the shortcut menu. A dialog bo8 is displayed, as shown in 3igure (.

3igure ( #onfiguring A interface tag of the !"#

b. "elect Basic Data tab, on the tab page, set the !alue of the A Interface %ag

to *SM+PHAS,+..

. "et the configuration of the speech version in a cell as supporting full-rate speechversion or half-rate speech version .

2016-01-06 HUAWEI Confienti!l "!#e($ Tot!l1%




a. 6n the BSC"### $ocal Maintenance %erminal, select a cell on the

Management %ree tab page, and then right-clic0 it. #hoose Configure Cells

Attri(utes from the shortcut menu. A dialog bo8 is displayed, as shown in 3igure

).

3igure ) #onfiguring #ells Attributes dialog bo8

b. 9ouble-clic0 a corresponding cell in the Cell view area, and then add it to the

list of the Selected cells.

c. #lic0 'e&t. A dialog bo8 is displayed, as shown in 3igure .

3igure #onfiguring #ells Attributes dialog bo8





d. #lic0 Configure Cells Attri(utes. A dialog bo8 is displayed, as shown in

3igure .

3igure "et #ells Attributes dialog bo8

2016-01-06 HUAWEI Confienti!l "!#e)$ Tot!l1%




e. #lic0 Call Control. A dialog bo8 is displayed, as shown in 3igure .

3igure "etting call control parameters

2016-01-06 HUAWEI Confienti!l "!#e*$ Tot!l1%




f. #lic0 Advanced. A dialog bo8 is displayed, as shown in 3igure .

3igure "et #all #ontrol $arameter:#ell' ;;)+< dialog bo8

2016-01-06 HUAWEI Confienti!l "!#e%$ Tot!l1%




g. 6n the Access Control tab page, modify the value of Speec !ersion as

Support /ull-rate !ersion 0. %f the cell supports the half-rate service, select

Support Half-rate !ersion 0 at the same time.

. #onfigure the AMR call processing parameters

a. As shown in 3igure , select AMR Call Control tab. 6n the tab page,

configure the AMR call processing parameters applied to the full-rate and half-

rate channels, as shown in 3igure = and 3igure >.

3igure = #onfiguring AMR full-rate call processing parameters in a cell

3igure > #onfiguring AMR half-rate call processing parameters in a cell

'O%,1

AMR ACS 2/3 in 3igure = and AMR ACS 2H3 in 3igure > can select four types of





coding rate at most and one coding rate at least separately.

. #onfigure the full handover and half handover parameters in an AMR cell.

a. As shown in 3igure , clic0 Handover Data. A dialog bo8 is displayed, as

shown in 3igure ?. %n the Parameter 'ame area, set the !alue for Intracell HO

Allowed and Inttracell /-H HO Allowed.

3igure ? #onfiguring full handover and half handover control parameters in an

AMR cell @(

b. $ull down the scroll bar shown in 3igure ?, as shown in 3igure (;. %n the

Parameter 'ame area, set !alue for Intracell /-H HO Stat %ime2s3, Intracell

/-H HO $ast %ime2s3, /H HO t, and H/ HO t.

3igure (; #onfiguring full handover and half handover control parameters in an

AMR cell @)





. #onfigure the AMR power control parameters in a cell

a. As shown in 3igure , clic0 Power Control. A dialog bo8 is displayed, as

shown in 3igure ((.

3igure (( "etting power control parameters





b. #lic0 Advanced. A dialog bo8 is displayed, as shown in 3igure ().

3igure () #onfiguring AMR power control parameters in a cell

2016-01-06 HUAWEI Confienti!l "!#e1&$ Tot!l1%




c. "elect AMR Power Control tab. 6n the tab page, configure the parameters

shown in AMR $ower #ontrol.

=. #onfigure the AMR channel management parameters in a cell

a. As shown in 3igure , clic0 Cannel Management. A dialog bo8 is displayed,

as shown in 3igure (.

3igure ( "etting channel management parameters

b. #lic0 Advanced. A dialog bo8 is displayed, as shown in 3igure (.

3igure ( #onfiguring AMR channel management parameters in a cell

2016-01-06 HUAWEI Confienti!l "!#e1'$ Tot!l1%




c. "elect H4II Cannel Assignment and Radio Cannel Control tab. 6n the

tab page, configure AMR %CH5H Prior Allowed and AMR %CH5H Prior Cell

$oad %resold.

>. %f the site used currently supports the AMR, but the !T" software does not support

the AMR, based on the description of software versions in Table (, the !T" software

version that supports the AMR features is obtained. Then, apply the obtained version to

the !T". 6therwise, the AMR fails to be configured.

,&ample

+nable the AMR function in the cells where the !T"5 supports the half-rate service. A

ma8imum of (;; TR5s that supports AMR features are supported in the license. The AMR

parameters are configured as follows'

• +nsure that the software version used in the !T"5 is B!T")C;)R;;)#;"$;)

and later releases

• #onfigure full-rate speech coding algorithm and half-rate speech coding algorithm

that are supported by the M"#

• Activate the license that supports the AMR function

• #onfigure the A interface tag as *SM+PHAS,+., as shown in 3igure (.

• #onfigure full-rate speech version and half-rate speech version that are supported

by a cell, as shown in 3igure

• Dse the default value to configure the AMR call processing parameters in a cell, as

shown in 3igure = and 3igure >

2016-01-06 HUAWEI Confienti!l "!#e1($ Tot!l1%




• Dse the default value to configure the full handover and half handover parameters in

an AMR cell, as shown in 3igure ? and 3igure (;

• #onfigure full-rate speech version and half-rate speech version that are supported

by a cell, as shown in 3igure

• Dse the default value to configure the AMR power control parameters in a cell, as

shown in 3igure ()

• Dse the default value to configure the AMR channel management parameters in a

cell, as shown in 3igure . The configuration is complete.

!erif6ing AMR

4ou can ensure that whether a call uses the AMR by verifying the AMR through the BSC"###

$ocal Maintenance %erminal.

Prere7uisites

• The BSC"### $ocal Maintenance %erminal is started normally.

• The communication between the !"# and the !T" is normal.

Procedure

1+ 6n the BSC"### $ocal Maintenance %erminal, choose %race 8 Monitor tab on the

Management %ree tab page. Then, choose %race E %race 9ser Message. 9ouble-

clic0 it. A dialog bo8 is displayed, as shown in 3igure (.

3igure ( Trace Dser Message dialog bo8





2+ "et parameters in the Interface %6pe, %racing Mode, and Color areas. "elect and fill

in the IMSI, %MSI, MSISD', IM,I, or Cannel of the user to be traced. #lic0 O: to

start tracing. The result is displayed, as shown in 3igure ).

3igure ) Tracing "ingle user message

&+ "elect the area where the CHA'',$ AC%I!A%IO' @CHA'',$ AC%I!A%IO' are

displayed in two places in the dialog bo8. 4ou need select the one near the

ASSI*'M,'% COMP$,%,. e8ists, and then double-clic0 the area. A dialog bo8 isdisplayed, as shown in 3igure .

2016-01-06 HUAWEI Confienti!l "!#e1)$ Tot!l1%




3igure 9isplayed result

• %f the value of the speec-coding-algor is gsm-speec-coding-algoritm-

version203, the AMR is used.

• 6therwise, the AMR is not used.

Capa(ilities

The AMR capabilities consist of the functions that AMR supports and the limitations on AMR.

The AMR supports the following functions'

• The AMR speech coding/decoding function can be performed on a full-rate channel.

There are eight types of speech rates'

().) 0bit/s @B"M +3R

(;.) 0bit/s

=.? 0bit/s

=.; 0bit/s @%"-(

.=; 0bit/s

.?; 0bit/s

.( 0bit/s

.= 0bit/s

2016-01-06 HUAWEI Confienti!l "!#e1*$ Tot!l1%




The coding rate can be ad&usted based on #/% and the AMR speech

coding/decoding on a full-rate channel can be ad&usted in the Active #oding "et

@A#".

• The AMR speech coding/decoding function can be performed on a half-rate channel.

There are five types of speech rates'

=.; 0bit/s @%"-(

.=; 0bit/s

.?; 0bit/s

.( 0bit/s

.= 0bit/s

The coding rate can be ad&usted based on #/% and the AMR speech

coding/decoding on a half-rate channel can be ad&usted in the Active #oding "et

@A#".

• The AMR supports the quality-based *R-3R intra-cell handover.

• The AMR calls and non-AMR calls use different power control strategies.

• The AMR service can be enabled or disabled at the cell level.

• 9ifferent A#"s, coding rate ad&ustment thresholds and hysteresis, and initial coding

rates can be set at the cell level.

• The AMR supports the dynamic configuration of AMR functions, A#", coding rate

ad&ustment threshold and hysteresis, and initial coding rate.

The limitations on the AMR are as follows'

• The AMR supports the change in A#" during the handover. The AMR does not

support the change in A#" during the maintenance of channels.

• The AMR does not support the T36, RAT"##*, or pre-handover.

• The half-rate AMR service does not support the coding rate of =.? 0bit/s.

'O%,1

The fi8ed-rate bandwidth @> 0bit/s is used for transmission on the Abis interface in B!""

half-rate mode and the bandwidth cannot bear the speech coding information transmitted at a

rate of =.? 0bit/s. Therefore, the half-rate AMR service does not support the coding rate of

=.? 0bit/s. %n half-rate AMR service mode, only five types of coding rates are supported.

2016-01-06 HUAWEI Confienti!l "!#e1%$ Tot!l1%

Documents

AMR Settings Huawei