rate control description(2008!05!30)

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Rate Control Description

Issue 01

Date 2008-05-30

Huawei Proprietary and Confidential

Copyright Huawei Technologies Co., Ltd


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Copyright Huawei Technologies Co., Ltd. 2008. All r ights reserved.

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Rate Control Description Contents

Issue 01 (2008-05-30) Huawei Proprietary and Confidential


i

Contents

1 Rate Control Change History...................................................................................................1-1

2 Rate Control Introduction ........................................................................................................2-1

3 AMRC/AMRC-WB Algorithms...............................................................................................3-1

3.1 Initial Access Rate of AMRC/AMRC-WB.................................................................................... ................3-23.1.1 Initial Access Rate of AMRC...............................................................................................................3-2

3.1.2 Initial Access Rate of AMRC-WB.......................................................................................................3-3

3.2 AMRC/AMRC-WB Algorithm Based on Uplink Stability .......................................................... .................3-5

3.2.1 UL Measurement and Event Reporting................................................................................................3-5

3.2.2 UL AMRC/AMRC-WB Action.................................................. .......................................................... 3-8

3.2.3 UL AMRC/AMRC-WB Signaling Procedure....................................................................................3-10

3.3 AMRC/AMRC-WB Algorithm Based on Downlink Stability ...................................................... ..............3-11

3.3.1 DL Measurement and Event Reporting..............................................................................................3-11

3.3.2 DL AMRC/AMRC-WB Algorithm........................................................... .........................................3-13

3.3.3 DL AMRC/AMRC-WB Signaling Procedure....................................................................................3-15

3.4 AMRC/AMRC-WB Algorithm Based on Basic Congestion........................... ............................................3-16

3.4.1 UL AMR/AMR-WB Rate Downsizing Based on UL Basic Congestion ...........................................3-16

3.4.2 DL AMR/AMR-WB Rate Downsizing Based on DL Basic Congestion ...........................................3-17

3.4.3 Signaling Procedure of AMR/AMR-WB Rate Downsizing...............................................................3-17

3.4.4 Relation Between Congestion and Rate Upsizing..............................................................................3-18

3.5 AMRC/AMRC-WB Algorithm for TFO/TrFO ............................................................ ...............................3-18

3.5.1 Background Information of TFO/TrFO .............................................................. ...............................3-18

3.5.2 Support for TFO/TrFO.......................................................................................................................3-19

3.5.3 AMRC/AMRC-WB Algorithm for TFO/TrFO .............................................................. ....................3-19

4 DCCC Algorithm........................................................................................................................4-1

4.1 Rate Reallocation Based on Traffic Volume....................................... ........................................................... 4-1

4.1.1 Traffic Volume Measurement and Event Reporting ............................................................ .................4-1

4.1.2 UL Rate Reallocation Based on Traffic Volume ....................................................... ...........................4-4

4.1.3 DL Rate Reallocation Based on Traffic Volume ....................................................... ...........................4-8

4.1.4 Signaling Procedure of Rate Reallocation Based on Traffic Volume................................................. 4-11

4.2 Rate Reallocation Based on Throughput.....................................................................................................4-14

4.2.1 Throughput Measurement and Event Reporting ............................................................ ....................4-14

4.2.2 Rate Reallocation Action Based on Throughput ............................................................ ....................4-16


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4.2.3 Signaling Procedure of Rate Reallocation Based on Throughput ...................................................... 4-17

4.3 Rate Reallocation Based on Link Quality ..................................................................... ..............................4-19

4.3.1 Uplink Quality Measurement and Event Reporting...........................................................................4-19

4.3.2 Downlink Quality Measurement and Event Reporting ............................................................. .........4-20

4.3.3 Rate Reallocation Action Based on Uplink Quality...........................................................................4-25

4.3.4 Rate Reallocation Action Based on Downlink Quality......................................................................4-26

4.3.5 Signaling Procedure of Rate Reallocation Based on Downlink Quality......... ...................................4-28

4.4 BE Rate Downsizing and Recovery Based on Basic Congestion...................................................... ..........4-29

4.4.1 UL BE Rate Downsizing and Recovery Based on UL Basic Congestion ..........................................4-29

4.4.2 DL BE Rate Downsizing and Recovery Based on DL Basic Congestion ..........................................4-31

4.4.3 Signaling Procedure of Rate Downsizing ........................................................... ...............................4-32

4.4.4 Rate Upsizing Failure and Penalty.....................................................................................................4-33

4.5 UE State Transition Algorithm....................................................................................................................4-35

4.5.1 UE State Transition From CELL_DCH to CELL_FACH.................................................................. 4-36

4.5.2 UE State Transition From CELL_FACH to CELL_PCH................................................................... 4-38

4.5.3 UE State Transition From CELL_PCH to URA_PCH....................................................................... 4-39

4.5.4 UE State Transition From CELL_PCH or URA_PCH to CELL_FACH ...........................................4-39

4.5.5 UE State Transition From CELL_FACH to CELL_DCH.................................................................. 4-39

4.6 Always Online.............................................................................................................................................4-40

5 Link Stability Control Algorithms .........................................................................................5-1

5.1 Link Stability Control Algorithms for AMR/AMR-WB Speech Services.....................................................5-1

5.1.1 Uplink Link Stability Control Algorithm.............................................................................................5-1

5.1.2 Downlink Link Stability Control Algorithm............................................................. ...........................5-2

5.2 Link Stability Control Algorithms for VP Services................................................. ......................................5-3



5.3 Link Stability Control Algorithms for BE Services................................................. ......................................5-4



6 Rate Control Reference Documents .......................................................................................6-1


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Rate Control Description 1 Rate Control Change History



1-1

1 Rate Control Change HistoryRate Control Change History provides information on the changes between different

document versions.

Document and s

T nt and p t versions

Product Version

able 1-1Docume roduc

Document Version RAN Version RNC Version NodeB Version

01 (2008-05-30) 10.0 V200R010C01B051 V100R010C01B049

V200R010C01B040

Draft (2008-03-20) 10.0 V200R010C01B050 V100R010C01B045

There are two types of changes, which are defined as follows:

Feature change: refers to the change in the Rate Control feature of a specific produc tversion.

Editorial change: refers to the change in the information that has already been included,previous version.

01(2008-05-30)This is the document for the first commercial release of RAN10.0.

Compared with draft (2008-03-20) of RAN10.0, issue 01 (2008-05-30) of RAN10.0incorporates the changes described in the following table.

or the addition of the information that was not provided in the


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ChangeType

Change Description Parameter Change

Feature

changeNone. The parameters that are changed to

be non-configurable are listed asfollows:

Amr trigger time 6A1

Amr trigger time 6A2

Amr trigger time 6B1

Amr trigger time 6B2

Amr trigger time 6D

Wait Timer for Uplink Rate

Adjustment of Traffic AMR


Adjustment of Traffic WAMR DL Measurement Reporting

Period

Pending time after trigger 4A

Pending time after trigger 4B

E-DCH Throu Meas Period

DCH Throu Meas Period

Period Amount to trigger 4A on

EDCH

Period Amount after trigger 4A

on EDCH Period Amount to trigger 4B on

EDCH

Period Amount after trigger 4B on

EDCH

Percent Of Ratio For 128Kbps





Percent Of Ratio For 256Kbps Percent Of Ratio For 2890Kbps







Period Amount to trigger 4B on

DCH


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Change Change Description Parameter ChangeType

Period Amount after trigger 4B

after DCH

UL measurement filter coefficient

DL measurement filter coefficient

Be trigger time 6A1

Be trigger time 6A2

Be trigger time 6B1

Be trigger time 6B2

Be trigger time 6D

Be trigger time of Event E

Be Reporting period unit for event

E Be Event E reporting period in

10ms / min

re-TX monitor period

re-TX measure filter coef

Event A time to trigger

Event A pending time after trigger

Event F reporting power margin

Be trigger time of Event F


F

Be Event F reporting period in

10ms / min

DCCC rate up fail time threshold

DCCC rate up fail monitor time

length

DCCC rate up fail penalty time

length

Conversational service T2

Streaming service T2

Interactive service T2

Background service T2

IMS signal T2

Amr trigger time of Event E

Amr Event E Reporting Period In

10ms

Vp trigger time 6A1

Vp trigger time 6B1

Vp trigger time 6D

Vp trigger time of Event E


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Change Change Description Parameter ChangeType

Vp Event E reporting period in

10ms


Adjustment of Traffic BE

State trans traff redund coef

The Link Stability Control Algorithmfor BE Services is updated.

The UE State Transition From

CELL_FACH to CELL_DCH isupdated.

None

Editorialchange

General documentation change:

The Rate Control Parameters isremoved because of the creation ofRAN10.0 parameter Reference.

The structure is optimized.

None

Draft (2008-03-20)

This is a draft of the document for the first commercial release of RAN10.0.

Compared with issue 03 (2008-01-20) of RAN 6.1, this issue incorporates the changes

described in the following table.

Change Type Change Description Parameter Change

Feature change The AMRC/AMRC-WB

algorithms are updated and the

link stability control algorithmof AMR/AMR-WB speech

services is added, see 5.1 LinkStability Control Algorithms

for AMR/AMR-WB SpeechServices.

The added parameters are listed as

follows:

First Uplink QOS Enhancement

Action for Traffic BE

Second Uplink QOS Enhancement


Third Uplink QOS Enhancement


First Downlink QOS Enhancement


Second Downlink QOS

Enhancement Action for Traffic

BE

Third Downlink QOS

Enhancement Action for Traffic

BE

Uplink QOS Action Trigger

Indicator of Traffic BE

Srnc Downlink RLC QOS Action


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Trigger Indicator of Traffic BE


Adjustment of Traffic AMR

InterFreq Handover Switch based

on Uplink Traffic AMR

InterRat Handover Switch based



on Uplink Traffic WAMR




on Downlink Traffic AMR InterRat Handover Switch based

on Downlink Traffic AMR


on Downlink Traffic WAMR




on Uplink Traffic VP


on Downlink Traffic VP

Measurement of 6A1 Switch

Measurement of 5A Switch

Measurement of 6D Switch

Throughput-based rate

reallocation on the DCH isadded and only rate

downsizing is applicable. Fordetailed information, see 4.2

Rate Reallocation Based onThroughput.

The added parameters are listed as

follows:

DCH Throu Meas Period

Period Amount to trigger 4B on

DCH

Period Amount after trigger 4B on

DCH

percent of ratio for 8Kbps to

384Kbps


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Rate reallocation based on

uplink quality is added. Fordetailed information, see 4.3

Rate Reallocation Based onLink Quality.

The added parameters are listed asfollows:

UL measurement filter coefficient

Be trigger time 6A1

Be trigger time 6A2

Be trigger time 6B1

Be trigger time 6B2

Be trigger time 6D

Statistic Block Number for 5A

Event

Event 5A Threshold

Interval Block Number Value

Srnc Downlink RLC QOS Action

Trigger Indicator of Traffic BE

DL measurement filter coefficient

Event Ea relative threshold

Event Eb relative threshold

Be trigger time of Event E


E

Be Event E reporting period in

10ms

Be Event E reporting period in

min

RL Max DL TX power

Event A threshold

Event A time to trigger

Event A pending time after trigger

re-TX monitor period

re-TX measure filter coef

Uplink full coverage bit rate

Downlink full coverage bit rate

The link stability controlalgorithm has been added in

Rate Control. For detailed

information, see 5 LinkStability Control Algorithm.

The added parameters are listed asfollows:





Freq Handover Switch based on

Uplink Traffic WAMR



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Amr trigger time of Event E

Amr Reporting Period Unit For

Event E


10ms


Min





InterFreq Handover Switch basedon Downlink Traffic WAMR



Vp trigger time 6A1

Vp trigger time 6B1

Vp trigger time 6D


on Uplink Traffic VP

Vp trigger time of Event E

Vp Reporting Period Unit ForEvent E

Vp Event E Reporting Period In

10ms

Vp Event E Reporting Period In

Min


on Downlink Traffic VP

The DCCC, AMRC, and

AMRC-WB features have

been merged into one featureRate Control.

NoneEditorialchange

"Relation Between Congestion

and Rate Upsizing" is updated

and renamed as "RateUpsizing Failure and Penalty".For detailed information, see

4.4.4 Rate Upsizing Failureand Penalty.

None


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Implementation information

has been moved to a separatedocument. For information on

how to implement rate control,

see Configuring Rate Control

in RAN Feature

Configuration Guide.

None


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Rate Control Description 2 Rate Control Introduction



2-1

2 Rate Control IntroductionRate control triggers rate upsizing, rate downsizing, and handover for different services

according to the consumption of resources.

Ra control in the Wideband Code Division Multiple Access (WCDMA) system has two: rate control over Adaptive Multi Rate (AMR) services and rate control over Best Effort

services. Rate control herein is described in terms of the following algorithms:

Adaptive Multi-Rate Control (AMRC) / AMRC-WB algorith

tetypes

(BE)

ms: They are implemented

d,

by the

Link stability control algorithm: It is implemented by the RNC. It triggers ratedownsizing, inter-frequency handover, and inter-RAT handover to guarantee the stability

of links and QoS of services. The rate downsizing of this algorithm is the power-based

Impact

AMR erformance

an process.

n be used to choose a proper AMR/AMR-WBs way,

DCC

he Uu and Iub

ith the user profile

by the RNC. They dynamically adjust the transport format based on the cell load, link

power, and Iub resource utilization, so as to achieve the balance between the system loalink stability, Iub resources, and link QoS. The UL AMRC/AMRC-WB algorithm andthe DL AMRC/AMRC-WB algorithm work independently.

Dynamic Channel Configuration Control (DCCC) algorithm: It is implemented

RNC. It controls the rate of BE services according to the traffic volume, throughput,

radio link quality, or congestion state. The UL DCCC algorithm and the DL DCCCalgorithm work independently.

rate downsizing in AMRC/AMRC-WB and DCCC.

C/AMRC-WB Impact on System P

The AMRC/AMRC-WB algorithm can be used to steer the UL permitted highest

AMR/AMR-WB speech codec mode down according to the UE transmit power. In thisway, the UL coverage is expanded.

The AMRC/AMRC-WB algorithm can be used to steer the permitted highest

AMR/AMR-WB speech codec mode down according to DPDCH transmit power or UE

transmit power. In this way, the system capacity is increased in terms of the maximumnumber of UEs that the system c

The AMRC/AMRC-WB algorithm caspeech codec mode according to the quality of the transmission environment. In thithe speech quality is ensured.

C Impact on System Performance

Every time rate adjustment occurs, there is interactive signaling on t

interfaces. The impact on the system performance has relations w


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mode and the user traffic mode. In general, there is little impact of DCCC on the system

Link S Performance

Link stability control algorithm has no impact on system performance.t on Other Features

Network Elem

T - the rk ts (NEs d in trol

Table 2- Es involv in rate control

performance.

tability Control Algorithm Impact on System

Rate Control Impac

Rate control has no impact on other features.

ents Involved

able 2 1describes Netwo Elemen ) involve rate con .

1N ed

UE NodeB RNC MSC MGW SGSN GGSN HLR

Server

NOT

: involved

UE = User Equipment, RNC = Radio Network Controller, MSC = Mobile Service Switching Center,

MGW = Media Gateway, SGSN = Serving GPRS Support Node, GGSN = Gateway GPRS SupportNode, HLR = Home Location Register

E:

: not involved


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Rate Control Description 3 AMRC/AMRC-WB Algorithms



3-1

3 AMRC/AMRC-WB AlgorithmsT describes Key ed in the AMRC/AMRC-WB feature.

T n

able 3-1 terms involv

able 3-1Key terms i volved in the AMRC/AMRC-WB feature

Term Definition

Guaranteed bit(GBR)

rate The GBR is the minimum bit rate for the RNC to adjust. It is

contained in the RAB assignment message that the CN sends to theRNC.

The supported

AMR speech codecmode set

The set consists of all the AMR speech codec modes that can be used

for the service transport. The set is decided by the RNC accordingthe mode set specified by the RAB assignment.

to

The controllable The set consists of the AMR speech codec modes that are containedin the supported AMR speech codec mode set and are equal to orAMR speech codecmode set larger than the GBR. The modes in this set can be selected by the

AMRC/AMRC-WB algorithm.

For example:

The supported AMR speech codec mode set is {NO DATA, SID, 4.75 kbit/s, 7.95 kbit/s,12.2 kbit/s}.

Then, the controllable AMR speech codec mode set is {4.75 kbit/s, 7.95 kbit/s, 12.2 kbit/s},if the GBR is 4.75 kbit/s.

This chapter describes two important algorithms: AMRC and AMRC-WB, the following lists

c

k Stability

AMRC/AMRC-WB Algorithm Based on Downlink Stability

AMRC/AMRC-WB Algorithm Based on Basic Congestion

AMRC/AMRC-WB Algorithm for TFO/TrFO

the ontents of this chapter.

Initial Access Rate of AMRC/AMRC-WB

AMRC/AMRC-WB Algorithm Based on Uplin


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3.1 Initial Access Rate of AMRC/AMRC-WB

3.1.1 Initial Access Rate of AMRC

Initial Access Rate of AMRC provides the definition of initial access rate, values of initialaccess rate and controllable mode set in different situations.

Definition of Initial Access Rate For uplink, the initial access rate is not only the maximum permitted bit rate at the start

of the communication phase, but also the maximum bit rate that the UL AMRC

algorithm can select, that is, the maximum bit rate in the uplink controllable AMR

speech codec mode set (controllable mode set for short) and uplink supported AMRspeech codec mode set (supported mode set for short).

For downlink, the initial access rate is the maximum permitted bit rate at the start of thecommunication phase.

Value of Initial Access Rate

AMRC Algorithm Enabled

When the AMRC algorithm is enabled,

If the cell load is in basic congestion, the initial access rate is the GBR in the RABparameters.

If the cell load is normal, commonly, the initial access rate is the maximum rate that is inthe RAB assignment message sent from the CN and meets both the following conditions:

Higher than or equal to the GBR in the RAB assignment message sent from the CN

Lower than or equal to the UE-priority-oriented maximum rate that is set on the RNCLMT

For detailed information about how to enable the AMRC algorithm, see theRate Control

Configuration Guide.

The UE-priority-oriented maximum rate refers to the Max mode of narrowband AMRC for goldenusers, Max mode of narrowband AMRC for silver users, and Max mode of narrowband AMRC for

copper usersparameters. For detailed information about the definitions and description of the user

priority, see Priorities Involved in Load Control.

If the UE-priority-oriented maximum rate is lower than the GBR in the RAB assignment message, then

the initial access rate is the GBR.

This note applies to all the initial access rates mentioned thereafter.

AMRC Algorithm Disabled

When the AMRC algorithm is disabled, the initial access rate is the maximum rate that is in

the RAB assignment message sent from the CN and meets both the following conditions:



In this case, all the AMR rates in the controllable mode set, a subset of the set in the RAB

assignment message, are no lower than GBR and no higher than the UE-priority-oriented

maximum rate configured on the RNC LMT.


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Controllable Mode Set

Only when AMRC algorithm is enabled, the controllable mode set is valid.

For links in the uplink,

If the initial access rate is the GBR in the RAB assignment message, the uplinkcontrollable mode set contains only one rate, that is, {GBR in the RAB assignmentmessage}.

If the initial access rate is higher than the GBR in the RAB assignment message, the

uplink controllable mode set is {GBR in the RAB assignment message, initial accessrate}.

For links in the downlink,

In the case of Iu UP version 2, the downlink controllable mode set contains all therates that are included in the RAB assignment message and higher than or equal to

the GBR.

In the case of Iu UP version 1 and code-resource-saving algorithm disabled, assume

that the maximum rate that is in the RAB assignment message sent from the CN andmeets both of the following conditions is expressed as Rmax:

a. Higher than or equal to the GBR in the RAB assignment message sent from theCN

b. Lower than or equal to the UE-priority-oriented maximum rate that is set on theRNC LMT

Then, if Rmax is higher than the GBR, the downlink controllable mode set is {GBR inthe RAB assignment message, Rmax}. Otherwise, the downlink controllable mode set

contains only one rate, that is {GBR in the RAB assignment message}.

In the case of Iu UP version 1 and code-resource-saving algorithm enabled,

If the initial access rate is the GBR in the RAB assignment message, the downlink

controllable mode set contains only one rate, that is, {GBR in the RAB assignmentmessage}.


downlink controllable mode set is {GBR in the RAB assignment message, initialaccess rate}.

The DL code-resource-saving algorithm is available for the RNC. This algorithm allows a single speechservice which has a DL maximum rate of 7.95 kbit/s or lower to use 256 as the Spreading Factor (SF)

for the downlink. When the DL code-resource-saving algorithm is disabled, SF128 is used for thedownlink.

3.1.2 Initial Access Rate of AMRC-WB

This provides the definition of initial access rate, values of initial access rate and controllable

mode set in different situations.

Definition of Initial Access Rate For uplink, the initial access rate is not only the maximum permitted bit rate at the start

of the communication phase, but also the maximum bit rate that the UL AMRC-WBalgorithm can select, that is, the maximum bit rate in the uplink controllable AMR-WBspeech codec mode set (controllable mode set for short) and uplink supported AMR-WB

speech codec mode set (supported mode set for short).


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For downlink, the initial access rate is the maximum permitted bit rate at the start of thecommunication phase.

Value of Initial Access Rate

AMRC-WB Algorithm Enabled

When the AMRC-WB algorithm is enabled,

If the cell load is in basic congestion, the initial access rate is the GBR in the RABparameters.

If the cell load is normal, the initial access rate is the maximum rate that is in the RABassignment message sent from the CN and meets both the following conditions:



For detailed information about how to enable the AMRC-WB algorithm, see theRate ControlConfiguration Guide.

The UE-priority-oriented maximum rate refers to the Max mode of wideband AMRC for golden users,

Max mode of wideband AMRC for silver users, and Max mode of wideband AMRC for copperusersparameters. For detailed information about the definitions and description of the user priority, see

Priorities Involved in Load Control inLoad Control.

If the UE-priority-oriented maximum rate is lower than the GBR in the RAB assignment message, then

the initial access rate is the GBR.

This note applies to all the initial access rates mentioned thereafter.

AMRC-WB Algorithm Disabled

When the AMRC-WB algorithm is disabled, the initial access rate is the maximum rate that is

in the RAB assignment message sent from the CN and meets both the following conditions:



Controllable Mode Set

Only when AMRC-WB algorithm is enabled, the controllable mode set is valid.

For links in the uplink,

If the initial access rate is the GBR in the RAB assignment message, the uplink

controllable mode set contains only one rate, that is, {GBR in the RAB assignmentmessage}.


uplink controllable mode set is {GBR in the RAB assignment message, initial accessrate}.

For links in the downlink,

In the case of Iu UP version 2, the downlink controllable mode set contains all therates that are included in the RAB assignment message and higher than or equal tothe GBR.


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In the case of Iu UP version 1, assume that the maximum rate that is in the RABassignment message sent from the CN and meets both of the following conditions isexpressed as Rmax:

Higher than or equal to the GBR in the RAB assignment message sent from the

CN Lower than or equal to the UE-priority-oriented maximum rate that is set on the

RNC LMT

Then, if Rmax is higher than the GBR, the downlink controllable mode set is {GBR inthe RAB assignment message, Rmax}. Otherwise, the downlink controllable mode setcontains only one rate, which is {GBR in the RAB assignment message}.

3.2 AMRC/AMRC-WB Algorithm Based on UplinkStability

The UL AMRC algorithm steers the UL permitted highest AMR speech codec mode up ordown according to the UE transmit (TX) power.

3.2.1 UL Measurement and Event Reporting

Measurement results serve as the basis of AMRC/AMRC-WB. By comparing the

measurement results with associated thresholds, the UE reports events. Then, the RNC takesassociated AMRC/AMRC-WB actions.

UL Measurement

In the uplink, the measurement quantity is the transmit power of the UE.

UL Events and Thresholds

UL AMRC/AMRC-WB events consist of 6A1, 6A2, 6B1, 6B2 and 6D.

Events 6A1, 6A2, 6B1, and 6B2

Events 6A1, 6B1, 6A2, and 6B2 have their respective thresholds. The thresholds 6A1, 6B1,6A2, and 6B2 in Figure 3-1are specific for measurement events 6A1, 6B1, 6A2, and 6B2

respectively.


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Figure 3-1UL events and thresholds

The Delta_6a1, Delta_6b1, Delta_6a2, and Delta_6b2 in Figure 3-1refer to the following

relative values respectively:

The relative value between the TX power threshold 6A1 and the Max UL TX power of

conversational service

The relative value between the TX power threshold 6B1 and the Max UL TX power of

conversational service

The relative value between the TX power threshold 6A2 and the Max UL TX power ofconversational service

The relative value between the TX power threshold 6B2 and the Max UL TX power ofconversational service

Therefore, Delta_6a1, Delta_6b1, Delta_6a2, and Delta_6b2 are relative measurement

thresholds.

A set of relative measurement thresholds for all AMR/AMR-WB services are configured. Theset includes the following parameters:

Uplink 6A1 event relative threshold

Uplink 6B1 event relative threshold Uplink 6A2 event relative threshold

Uplink 6B2 event relative threshold

The measurement thresholds, that is, the absolute measurement thresholds, are calculated onthe basis of the following formula:

Measurement threshold 6A1 = Max UL TX power of conversational service Uplink

6A1 event relative threshold

Measurement threshold 6B1 = Max UL TX power of conversational service Uplink6B1 event relative threshold

Measurement threshold 6A2 = Max UL TX power of conversational service Uplink

6A2 event relative threshold


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Measurement threshold 6B2 = Max UL TX power of conversational service Uplink6B2 event relative threshold

Event 6D

The threshold of event 6D is the maximum UE Tx power, which can not be set on the RNCLMT.

Figure 3-2Event 6D and thresholds

Event Reporting

After establishing an AMR/AMR-WB speech service, the UTRAN sends the UE a

MEASUREMENT CONTROL message to configure

the TX power threshold of 6A1, 6B1, 6A2, 6B2, and 6D.

the trigger time of 6A1, 6B1, 6A2, 6B2, and 6D.

For AMR/AMR-WB service, the trigger time of 6A1, 6B1, 6A2 and 6B2 is set to 320 ms,and the trigger time of 6D is set to 640 ms.

Then, the UE measures the TX power in real time, filters the measurement results, and makes

decisions as follows:

If the UE TX power has been higher than TX power threshold 6A1 for a period longer

than the trigger time of 6A1 and the TRIGGERED_6A1_EVENTvariable is FALSE,event 6A1 is triggered and the TRIGGERED_6A1_EVENTvariable is set to TRUE.

If the TRIGGERED_6A1_EVENTvariable is TRUE and the UE TX power is lower thanTX power threshold 6A1, the TRIGGERED_6A1_EVENTvariable is set to FALSE.

If the UE TX power has been lower than TX power threshold 6B1 for a period longer

than the trigger time of 6B1 and the TRIGGERED_6B1_EVENTvariable is FALSE,event 6B1 is triggered and the TRIGGERED_6B1_EVENTvariable is set to TRUE.

If the TRIGGERED_6B1_EVENTvariable is TRUE and the UE TX power is higher thanTX power threshold 6B1, the TRIGGERED_6B1_EVENTvariable is set to FALSE.

If the UE TX power has been lower than TX power threshold 6B2 for a period longer

than the trigger time of 6B2 and the TRIGGERED_6B2_EVENTvariable is FALSE,event 6B2 is triggered and the TRIGGERED_6B2_EVENTvariable is set to TRUE.


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If the TRIGGERED_6B2_EVENTvariable is TRUE and the UE TX power is higher thanTX power threshold 6B2, the TRIGGERED_6B2_EVENTvariable is set to FALSE.

If the UE TX power has been higher than TX power threshold 6A2 for a period longerthan the trigger time of 6A2 and the TRIGGERED_6A2_EVENTvariable is FALSE,

event 6A2 is triggered and the TRIGGERED_6A2_EVENTvariable is set to TRUE. If the TRIGGERED_6A2_EVENTvariable is TRUE and the UE TX power is lower than

TX power threshold 6A2, the TRIGGERED_6A2_EVENTvariable is set to FALSE.

If the UE Tx power equals the maximum UE TX power for the trigger time of 6D andthe variable TRIGGERED_6D_EVENT is set to FALSE, event 6D is triggered and thevariable TRIGGERED_6D_EVENT to TRUE.

If the variable TRIGGERED_6D_EVENT is set to TRUE and if the UE Tx power is less

than the maximum UE TX power, set the variable TRIGGERED_6D_EVENT toFALSE.

For detailed information about the TRIGGERED_6A1_EVENT, TRIGGERED_6A2_EVENT,TRIGGERED_6B1_EVENT, TRIGGERED_6B2_EVENTand TRIGGERED_6D_EVENTvariables, seethe 3GPP TS 25.331.

Each time a measurement event is triggered, the UE sends the measurement report to the

UTRAN (as shown in Figure 3-1) and the UL AMRC/AMRC-WB algorithm makes acorresponding adjustment according to the reported measurement event. For detailed

information about the signaling procedure, see 3.2.3 UL AMRC/AMRC-WB SignalingProcedure.

3.2.2 UL AMRC/AMRC-WB Action

Based on the event reports from the UE, the UL AMRC/AMRC-WB algorithm takes

associated AMRC/AMRC-WB actions.

Principles of the UL AMRC/AMRC-WB Algorithm

The principles of the UL AMRC/AMRC-WB algorithm are as follows:

To steer the UL permitted highest AMR/AMR-WB speech codec mode up, the followingrequirements must be satisfied:

The UE TX power is below a certain threshold.

The UL load resource is not in congestion state.

To steer the UL permitted highest AMR/AMR-WB speech codec mode down, the UE TXpower must be higher than a certain threshold.

The UL AMRC/AMRC-WB algorithm steers the UL permitted highest AMR/AMR-WBspeech codec mode up or down in the controllable mode set by only one level each time.

Details of the UL AMRC/AMRC-WB Algorithm

The UL AMRC/AMRC-WB algorithm adjusts the UL permitted highest AMR/AMR-WBspeech codec mode as follows:

When an event 6A1 or 6D is received, the UL AMRC/AMRC-WB algorithm decreases

the UL permitted highest AMR/AMR-WB speech codec mode by one level and starts theUL AMRC/AMRC-WB timer whose length is 3000ms. If the rate before the decrease is

GBR or rate decrease fails, handover can be performed. For details, refer to 5.1 Link

Stability Control Algorithms for AMR/AMR-WB Speech Services.


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If the event 6B1 or 6B2 is received before the UL AMRC/AMRC-WB timer expires,the adjustment is completed. Then, the UL AMRC/AMRC-WB algorithm stops theUL AMRC/AMRC-WB timer and ends the adjustment.

If no event 6B1 or 6B2 is received before the UL AMRC/AMRC-WB timer expires

and if the current rate is higher than GBR, the adjustment is not complete. The ULAMRC/AMRC-WB algorithm decreases the UL permitted highest AMR/AMR-WB

speech codec mode by one more level and restarts the UL AMRC/AMRC-WB timer.If the rate before the decrease is GBR, handover can be performed. For details or rate

decrease fails, refer to 5.1 Link Stability Control Algorithms for AMR/AMR-WBSpeech Services.

When an event 6B2 is received and UL load resource is not in congestion state, the ULAMRC/AMRC-WB algorithm increases the UL permitted highest AMR/AMR-WB

speech codec mode by one level and starts the UL AMRC/AMRC-WB timer whoselength is 3000ms. If the rate before the increase is the maximum one in the controllable

mode set, no increase will be performed, and the UL AMRC/AMRC-WB timer does notstart.

If the event 6A2 or 6A1 is received before the UL AMRC/AMRC-WB timer expires,the adjustment is completed. Then, the UL AMRC/AMRC-WB algorithm stops the

UL AMRC/AMRC-WB timer and ends the adjustment.

If no event 6A2 or 6A1 is received before the UL AMRC/AMRC-WB timer expiresand if UL load resource is still not in congestion state, the adjustment is not complete.

The UL AMRC/AMRC-WB algorithm increases the UL permitted highestAMR/AMR-WB speech codec mode by one more level and restarts the UL

AMRC/AMRC-WB timer. If the rate before the increase is the maximum one in thecontrollable mode set, no increase will be performed, and the UL AMRC/AMRC-WBtimer does not restart.

In current version, there are two rates in the controllable mode set at most.

Table 3-2UL AMRC/AMRC-WB algorithm

Event Permitted Highest AMR/AMR-WBSpeech Codec Mode

UL AMRC/AMRC-WBTimer

6A1 Started

6B1 Stopped

6A2 Stopped

6B2 Started

: depicts decrease in the permitted highest AMR/AMR-WB speech codec mode.

: depicts increase in the permitted highest AMR/AMR-WB speech codec mode.

: depicts no change on the current permitted highest AMR/AMR-WB speech codecmode.

If event 6B1 is reported when the permitted highest AMR/AMR-WB speech codec mode is, then no adjustment related to event 6B1 is made.

If event 6A2 is reported when the permitted highest AMR/AMR-WB speech codec mode is, then no adjustment related to event 6A2 is made.


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If the event 6A2 or 6B1 is received when the UL AMRC/AMRC-WB timer is not started, the

AMRC/AMRC-WB algorithm regards it as a normal variation of UE TX power and does not make anyadjustment.

3.2.3 UL AMRC/AMRC-WB Signaling ProcedureThis describes UL AMRC/AMRC-WB signaling procedures.

As shown in Figure 3-3, the UTRAN sends the information to the UE through a

MEASUREMENT CONTROL message

the TX power threshold of 6A1, 6B1, 6A2, 6B2, and 6D.

the trigger time of 6A1, 6B1, 6A2, 6B2, and 6D.

Figure 3-3Signaling procedure of measurement control

As shown in Figure 3-4, the UE reports events 6A1, 6B1, 6A2, 6B2 or 6D by sending aMEASUREMENT REPORT message.

Figure 3-4Signaling procedure of measurement reporting

As shown in Figure 3-5, the RNC adjusts the UL permitted highest AMR/AMR-WB speech

codec mode by sending a TRANSPORT FORMAT COMBINATION CONTROL message

and adjusts the UL bandwidth by sending a QAAL2 MODIFY message.


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Figure 3-5Signaling procedure of UL AMR/AMR-WB speech codec mode adjustment

3.3 AMRC/AMRC-WB Algorithm Based on Downlink

StabilityThe DL AMRC algorithm steers the DL permitted highest AMR speech codec mode up or

down according to the DPDCH transmit (TX) power.

3.3.1 DL Measurement and Event Reporting

Measurement results serve as the basis of AMRC/AMRC-WB. By comparing the

measurement results with associated thresholds, the RNC triggers AMRC/AMRC-WB

actions.

DL Measurement

In the downlink, the measurement quantity is the DPDCH transmit (TX) power.

DL Events and Thresholds

DL AMRC/AMRC-WB events consist of E1, E2, F1, and F2.

The thresholds E1, E2, F1, and F2 in Figure 3-6are specific for measurement events E1, E2,F1, and F2 respectively.


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Figure 3-6DL Events and Thresholds

In Figure 3-6:

For event E1, the average TX power on the DPDCH is higher than the TX powerthreshold E1.

For event E2, the average TX power on the DPDCH is lower than the TX powerthreshold E2.

For event F1, the average TX power on the DPDCH is lower than the TX power

threshold F1.

For event F2, the average TX power on the DPDCH is higher than the TX powerthreshold F2.

The Delta_E1, Delta_E2, Delta_F1, and Delta_F2 in Figure 3-6refer to the following relative

values respectively:

The relative value between the TX power threshold E1 and the RL Max DL TX power

The relative value between the TX power threshold E2 and the RL Max DL TX power

The relative value between the TX power threshold F1 and the RL Max DL TX power

The relative value between the TX power threshold F2 and the RL Max DL TX power

Therefore, Delta_E1, Delta_E2, Delta_F1, and Delta_F2 are relative measurement thresholds.

A set of relative measurement thresholds for all AMR/AMR-WB services are configured. Theset includes the following parameters:

DL E1 event relative threshold

DL E2 event relative threshold

DL F1 event relative threshold

DL F2 event relative threshold


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The measurement thresholds, that is, the absolute measurement thresholds, are calculated on

the basis of the following formula:

Measurement threshold E1 = RL Max DL TX power DL E1 event relative threshold

Measurement threshold E2 = RL Max DL TX power DL E2 event relative threshold

Measurement threshold F1 = RL Max DL TX power DL F1 event relative threshold

Measurement threshold F2 = RL Max DL TX power DL F2 event relative threshold

Event Reporting

After establishing a service, the UTRAN sends a request to the NodeB for periodical

measurements of DL Transmitted Code Power (TCP) in the pilot field of DPCCH, and NodeB

sends the TCP measurement reports to the RNC every 480 ms.

The RNC processes the measurement report as follows:

1. The RNC converts DL TCP in the pilot field of DPCCH to the average TX power of the

DPDCH.

2. The RNC compares the average DPDCH TX power with the measurement thresholds E1,E2, F1 and F2 to determine the type of event.

3.3.2 DL AMRC/AMRC-WB Algorithm

The DL AMRC/AMRC-WB algorithm steers the DL permitted highest AMR/AMR-WBspeech codec mode up or down according to the DPDCH transmit (TX) power.

Principles of the DL AMRC/AMRC-WB Algorithm

The principles of the DL AMRC/AMRC-WB algorithm are as follows:

To steer the DL permitted highest AMR/AMR-WB speech codec mode up, the followingrequirements must be satisfied:

The DPDCH TX power is below a certain threshold.

The DL load resource is not in congestion state.

To steer the DL permitted highest AMR/AMR-WB speech codec mode down, theDPDCH TX power must be higher than a certain threshold.

The DL AMRC/AMRC-WB algorithm steers the DL permitted highest AMR/AMR-WB

speech codec mode up or down in the controllable mode set by only one level each time.

Details of the DL AMRC/AMRC-WB AlgorithmThe DL AMRC/AMRC-WB algorithm adjusts the DL permitted highest AMR speech codec

mode as follows:

When the average DPDCH power is higher than the threshold E1, the DLAMRC/AMRC-WB algorithm decreases the DL permitted highest AMR/AMR-WB

speech codec mode by one level and sets the AMRC/AMRC-WB status to Rate-Down. Ifthe rate before the decrease is GBR or rate decrease fails, handover can be performed.

For detailed information, see 5.1 Link Stability Control Algorithms for AMR/AMR-WBSpeech Services.

When the average DPDCH power is lower than the threshold F1 and the DL load is not

in congestion state, the DL AMRC/AMRC-WB algorithm increases the DL permittedhighest AMR/AMR-WB speech codec mode by one level and sets the


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AMRC/AMRC-WB status to Rate-Up. If the rate before the increase is the maximumone in the controllable mode set, no increase will be performed.

When the average DPDCH power is between the thresholds E2 and F2, the current DLAMR/AMR-WB speech rate is appropriate. The DL AMRC/AMRC-WB algorithm

makes no adjustment and sets the AMRC/AMRC-WB status to Normal. When the average DPDCH power is lower than or equal to the threshold E1 and higher

than the threshold E2, the DL AMRC/AMRC-WB algorithm makes adjustmentsaccording to the AMRC/AMRC-WB status.

If the AMRC/AMRC-WB status is Rate-Down, the DL AMRC/AMRC-WB

algorithm decreases the DL permitted highest AMR/AMR-WB speech codec modeby one level. If the rate before the decrease is GBR or rate decrease fails, handover

can be performed. For detailed information, see 5.1 Link Stability Control Algorithmsfor AMR/AMR-WB Speech Services.

If the AMRC/AMRC-WB status is Normal or Rate-Up, the DL AMRC/AMRC-WBalgorithm makes no adjustment.

When the average DPDCH power is lower than the threshold F2 and higher than or equalto the threshold F1, the DL AMRC/AMRC-WB algorithm makes adjustments accordingto the AMRC/AMRC-WB status and DL load status.

If the AMRC/AMRC-WB status is Rate-Up and the DL load is not in congestion state,the DL AMRC/AMRC-WB algorithm increases the DL permitted highest

AMR/AMR-WB speech codec mode by one more level. If the rate before theincrease is the maximum one in the controllable mode set, no increase will be

performed.

If the AMRC/AMRC-WB status is Normal or Rate-Down, the DLAMRC/AMRC-WB algorithm makes no adjustment.

Table 3-3Change of DL permitted highest AMR/AMR-WB speech codec mode

DPDCHPower

Mode Change whenAMRC/AMRC-WBStatus is Normal

Mode Change whenAMRC/AMRC-WBStatus is Rate_Down

Mode Change whenAMRC/AMRC-WBStatus is Rate_Up

DPDCH

power > the

TX powerthresholdE1

The TXpower

thresholdE2