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WCDMA Admission Control Algorithm and

Parameters

CQntents:

2. CAC (Cali Admission Control)

2.1 CAC Overview

2.2 CAC Based on Code Resource

2.3 CAC. Based on Power Resource

2.4 CAC Based on NodeB Credit Resource

2.5 CAC Based on ub Resource

2.6 CAC Based on the Number of HSPA Userş

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‘TWCDMA Admission Control Algorithm andParameters

HSPA User Number CAC

HSPA user number CAC is involved in:

Ceil level

Maximum. number of HSPA users in a celi

° NodeB İevel-

Maximum number of HSPA users in aH the celis configured in one

NodeB

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Parameters

CAC of HSDPA Users

When HSDPA UU ADCTRL is set to 1, the HSDPA services

have to undergo admission decision based on the number of

HSDPA users.

• When a new HSDPA service attempts to access the network, the

algorithm admits the service if the following conditions are met:

The number of HSDPA users in the celi does not exceed the maximum value

specifled by MaxHsdpaUserNum.

The number of HSDPA users in the NodeB does not exceed the maximum

value specified by NodeBHsdpaMaxUserNum.

• Otherwise, the HSDPA service is degraded to R99 service to retry

admission.

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[WCDMA Admission Control Algorithm and°arameters

CACofHSUPAUsers [• When HSUPA_UUADCTRL is set to 1 the HSUPA services have

to undergo admission decision based on the number of HSUPAusers

• When a new HSUPA service attempts to access the network, the [algorithm admits the service if the following conditions are met:

The nıımber of the HSUPA users in the ceil does not exceed the maximum valuespecifled by MaxHsupaUserNum.

The number of the HSUPA users in the NodeB does not exceed the maximum -‘

value specifled by NodeBHsupaMaxUserNum. [• Otherwise, the HSUPA service is degraded to R99 service to retry

admission

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WCDMA Admission Control Agonthm andParameters

Parameters of HSPA User Number

CAC• MaxHsdpaUserNum

Parameter name: Maximum HSDPA user number

Recommended value: 64

• NodeBHsdpaMaxUserNum

Parameter name: NodeB Max HSDPA User Number


• MaxHsdpaUserNum

o Content: Maximum number of users supported by the HSDPA channe. The

user in this parameter refers to the user with services on the HSDPA ohannel,

regardless of the number of RABs carried on the HSDPA channeL Maximum

HSDPA user number cannot exceed the HSDPA capabdity of the NodeB

product, in practice, the value can be set based on the celi type and the

richness of the available HSDPA power and code resources.

o Value range: 0—128

Physical value range: 0-128; step: 1

Set this parameter through ADD UCELLCAC/ MOD UCELLCAC.

• NodeBHsdpaMaxUserNum

Content: NodeB Max HSDPA User Number.

o Value range: 0—6144

o Physicai value range: 0-6144; step: 1

Set this parameter through ADD UNODEBALGOPARN MOD

UNODEBALGOPARA.


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WCDMA Admission Control Algorithm andParameters

Parameters of HSPA User NumberCAC(Cont.) İZ• MaxHsupaliserNum

Parameter name: Maximum HSUPA user number


• NodeBHsupaMaxUserNum

o Parameter name: NodeB Max HSUPA User Number

o Recommended vatue: 6144

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Content: Maximum number of users supported by the HSUPA channel. Theuser in this parameter refers to the user with services on the HSUPA channel, 1regardless of the number of RABs carried on the HSUPA channel. Maximum LHSUPA user numbercannot exceeci the HSUPA capabllity of the NodeBproduct, in practice, the value can be set based on the ceil type and the rrichness of the available HSUPA power and code resources.

Vaiuerange:0—128

Physicai value range: 0—1 28; step: 1

Set this parameter through ADD UCELLCAC/ MOD UCELLCAC.

• NodeBHsupaMaxUserNum

o Content: Maximum number of HSUPA users of the NodeB. If the HSUPA useraccess is rejected by the NodeB, you can infer that the HSUPA licenses areinsufficient. New HSUPA licenses are required.

Vaiue range: 0—6144


Set this parameterthrough ADD UNODEBALGOPARAI MODUNODEBALGOPARA.

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• MaxHsupaUserNum

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Parameters

Contents

1. Load Control Overview

2. CAC Algorithm and Parameters

3. IAC A!gorithm and Parameters


Perm ission

WCDMA Admission Control Aigorithm andParameters

Why Do We Need IAC?

• The disadvantages of CAC:

For PS NRT (NonReaI Time) serviceş, CAC is not flexible

No consideration aböut the priority of diffrent users

Na consideration about Directed Retry after CAC rejectiorı

• “Intelligent” means the algorithni. can increase admission

successful rate

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• The purpose of Intelligent Access Control (IAC) is ta increase the access success rate,that is, RRC connection success rate and RAB setup success rate.

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VVCDMA Admission Corıtrol Algorithm andParameters

• There are two types of IAC, IAC for RRC connection processing and IAC for RAB

pracessing:

IAC for RRC connection processing is used to select a suitahle ceil for a UE to

access through redirection and RRC DRD. it alsa implements bad balancing

and service steering

İAC for RAB processing is used to seiect a suitabie ceil for a UE ta access

through DRD and CAC. it alsa implements bad balancing and service steering.

Preemption, queuing, and iow-rate access are used to further improve the

RAB setup success rate

• IAC procedure supported by services:

Rate NegotıatEon DRD

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İAC Procedure


Contents

2. IAC (Intelligent Access Control)

2.4.1 IAC During RRC Connection Setup

2.4.2 Directed Retry Decısion During RAB Procedure

2.4.3 Rate Negotiation atAdmission Control

2.4.4 Admişsion Decision

2.4.5 Preemption

2.4.6 Queuing

2.4,7 Low-RateAccess of the PS BE Service

2.4.8 AC for Emergency Calis

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WCDMAAdmsSiOfl Control Algorithm andPararneters

. IAC — RRC Conneotion Setup

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WCDMA Admission Control Algorithm andParameters [

RRC Redirection Based on Weak rCoverage

• in weakcoverage areas, the UE access success rate is rusualiy Iow and the possibHity of cail drops is high.

in areas where the GSM coverage is better than the UMTS t.coverage, using inter-RAT RRC redirection based on weak

coverage can redireci UEs from the UMTS to the GSM

network to improve the UE access success rate and reduce

the cali drop rate.

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E2012 Huaweı Technoioes Co Ud AU rIhts raserved PagelOS HUAWI D

The procedure for inter-RAT RRC redirection based on weak coverage is as foflows:

• 1 .Upon receiving an RRC CONNECTION REQUEST message from the UE,

o If the PERFEN H_RRQ.WEAK_REDI R_SWITCH check box under the PerfEnhanceSwitchparameteris not selected, the RNC does not perform inter-RAT RRC redirection based on weakcoverage. The RRC connection setup request is then processed in the current ceB.

o If the PERFEN H_RRC_WEAK_REDI R SWITC H check box under the PerfEnhanceSwitchparameter is selected, the procedure goes ta the next step.

• 2. The RNC obtains the Ec/No value of the current celi from the RACH Measurement Report lE in theRRC CONNECTION REQUEST message,

If the Ec/No value ıs greater than or equal to the value of WeakCovRrcRedirEcNoThs, theRNC does not perform inter-RAT RRC redirection based on weak coverage. The RRCconnection setup request is then processed in the current celi.

If the Ec/No value is smallerthan the value of WeakCovRrcRedirEcNoThs, the procedure goesto the next step.

• 3. The RNC checks the bad status of the current cebi and checks whether to perform RRC Inter-RATredirection based on distance.

o If the ceM is in the normal state, the RNC generates a random vabue ranging from Oto 1 andcompares the value with the ReclirFactorOfNorm parameter. If the random value is equal to orsmablerthan the parameter, the RNC performs the next step. Otherwise, the RNC does notperform RRC Inter-RAT redirection based on distance, and handbes the RRC connection setuprequest of the UE in the current ceM.

o If the ceM is in the basic congestion state ot is overboaded, the RNC generates a random valueranging from 0 ta 1 and compares the value with the RedirFactorOfLDR parameter. it therandom value is equal to or smalier than the parameter, the RNC performs the next step.Otherwise, the RNC does not perform RRC Inter-RAT redirection based on distance, andhandles the RRC connection setup request of the UE in the currentcelt.

• 4. The RNC sends the UE an RRC CONNECTION REJECT message containing information on theneighboring GSM celis of the current celi.

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RRC Redirection Based on Distance

• Target service: UE-originating AMR services -‘

• RNC estimates the distance between the UE and the celi

center by considering the propagation delay

• RNC determines whether ta perform RRC redirection based

on the estimation result

• in actual situations, a UE may receive signals from a distant ceil and subsequently access the

ceil. However, the cells that are adjacent to this ceil are not configured as its neighboring celis.

If the UE moves out of this ceH, cail drops may occur. To solve this problem, RRC redirection

based on distance is introduced.

• The procedure of RRC redirection based on distance is as follows:

• 1. Upon receiving an RRC CONNECTION REQUEST message from the UE, the RNC

determines whetheı- the requested service is the UE-originating AMR service. if yes, the RNC

performs the next step. If no, the RNC does not perform RRC redirection based on distance,

and handles the RRC connection setup request of the UE in the current celi.

• 2. The RNC obtains the propagation delay from the NodeB and compares it with DelayThs.

If the propagation delay is greater than DelayThs, the RNC performs the next step.

If the propagation delay is equal to or smaller than DelayThs, the RNC does not

perform RRC redirection based on distance, and handles the RRC connection setup

request of the UE in the current celi.

• 3. The RNC checks the bad status of the current celi and determines whether to perform RRC

redirection based on distance by considering the bad status.

if the celi is in the normal state, the RNC generates a random value ranging from 0 to 1

and compares the value with the parameter RedirFactorOfNorm. lf the random value is

equal to or smaller than the parameter, the RNC performs the next step. Otherwise,

the RNC does not perform RRC redirection based on distance, and handles the RRC

connection setup request of the UE in the current ceiL.

If the cell iş in the basic congestion state or is overloaded, the RNC generates a

random value ranging from 0 to 1 and compares the value with the parameter

RedirFactorOfLDR. il’ the random value is equal to or smaller than the parameter, the

RNC performs the next step. Otherwise, the RNC does not perform RRC redirection

based on distance, and handles the RRC connection setup request of the UE in the

current ceil.

• 4. The RNC sends the UE an RRC CONNECTION REJECT message containing information

on the neighboring GSM celis of the current celi.


Perrnission

EWCDMAAdmissıon Control Algorithm andParameters

RRC Redirection for Service Steering E• Purpose: Enable the successful RRC connection setup by

selecting an appropriate celi for the UE based on the requested

service.

• During the RRC connection setup, the RNC implements service

steering between inter-frequency or inter-RAT cells according to

the cause of RRC connectıon setup. in addition, the RNC Econsiders the bad of the ceil for access and the redirection factors

to control the degree of bad balancing

Algorithm switch: DrSwitch-DR_ RRCDRD_SWITCH

Triggering factor. RedirFactorOfNorm or RedirFactorOfLDR

° Target celi: RedirSwitch

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[The procedure of RRC redirection for service steerirıg is as follows:

• 1. The RNC obtans the information about the seivice requested by the UE and the capabilityof the UE.

o If the DR_ RRC_DRD_SWITCH is set to 1, the RNC determines the service typerequested by the UE. If the RNC succeeds in determining the service type requestedby the UE and the switch of RRC direction for service steering (RedirSwitch) is set toONLY_TOJNTER_FREQUENCY or ONLYJOJNTER_RAT, the RNC performs thenextstep. Otherwise, the RNC handles the RRC connection setup request of the UEin the current celi.

o If the DR_ RRC_DRD_SWITCH is set to 0, the RNC handles the RRC connectionsetup request of the UE in the currerıt ceil. fl• 2. Based on the celi bad and the redirection factors, the RNC decides whether to perform

RRC redirection for service steering.

o If the celi is in the normal state, the RNC generates a random nunıber between 0 and L1 and compares it with the corresponding unconditional redirection factor(RedirFactorOfNorm). lf the random number is smaller than this factor, the RNCperforms the next step. Otherwise, the RNC handles the RRC connection setuprequest of the UE in the current cell.

o If the celI is in the basic congestion or overboad state, the RNC generates a random• number between 0 and 1 and compares itwith the value of RedirFactorOfLDR. If the

random number is smaller than this factor, the RNC performs the next step. Otherwise,the RNC handles the RRC connection setup request of the UE in the current ceil.

• 3. Based on the setting of RedirSwitch, the RNC takes the corresponding actions:

o If RedirSwitch is set ta ONLY_TOJNTER_FREQUENCY, the RNC sends an RRCCONNECTION REJECT message to the UE, redirecting the UE to the destinationfrequency carried in the message. ı



Parameters

—

f)U>DrSw!tchDR_ RRc_DRD_SWITCH

D Content: When the switch is on, DRD and redirection is performed for RRC connection if retry is

required.

o Value range: 0FF, ON

o Physical value range: 0, 1

o Set this parameter through SET UCORRMALGOSWITCH.

• RedirSwitch a i.t,ıl I°>

o Content: This parameter specifles whether the distance based RRC redirection algorithrn is valid. The

algorithm is valid only when the this switclı is set to ON.


o Set this parameterthrough SET UDISTANCEREDIRECTION ı4

• RedirFactorOfNorm/RedirFactorofLDR

o Content: When the bad of the serving celi is within the normal range, a UE may be redirected to

another celi according to the traffic type. This parameter specifies the possibility of redirecting

the UE to another ceil. When this parameter is set to 0, the RRC redirection is not performed if

the bad of the serving celi is within the normal range. When the UL bad state or DL bad state

of the serving ceil is LDR or OLC, a UE may be redirected to another cebi according to the traffic

type. This parameter specifies the possibibity of redirecting the UE to another celb. When this

parameter iş set to 0, the RRC redirection is not performed if the bad state on the serving ceil is

LDR or OLC. LDR indicates basic congestion. OLC indicates overload congestion.

Valuerange: 0—100

o Physical value range: 0-1; step: 001

Physical unit: %

• Set these parameters through ADD UCELLDISTANCEREDIRECTION 1 MOD

UCELLDISTANCEREDIRECTION.


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Parameters of RRC Redirection

• DrSw!tch-DR RRC_DRD_SW!TCH

Parameter name: DRD switch for RRC connection

o Recommended va(ue: ON

• RedirSwitch

Parameter name: Redirection Switch

° Recommended value: 0FF

• RedirFactorOfNorm/RedirpactorOfLDR

Parameter name: Redirection Factor Of Normal/LDR

Recommended value: 0 / (AMR: 50; other: 0)

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İZWCDMA Admission Control Algorithm andarameters [

RRCDRD İZ• Purpose:: Instruct.the UE to set up an RRO: cöflnection n an

...

........ ..... Lınter-frequency neıghborıng ceil wth better sıgnal qualıty

• Algorithm switch: DrSwitch-DR_.RRC_DRD_SWİTCH [• Target ceil: same-coverage inter-frequency neighboring

çelis, whi.ch quaity is large thanthreslıo.Id: [(CPICH - HcNo) > DRD -EcNO, [

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• The RNC performs the following steps: [• 1. The RNC selects the same-coverage inter-frequency neighboring celis of the current celi.

These neighboring celis are sultable for biind handovers

• 2. The RNC generates a list of candidate DRD-supportive inter-frequency celis. The candidateceil must meet the quality requirements of DRD:

D (CPICHECNO)RAcH > DRDECNOq

Here:

D (CPİCH_EcNo)cH is the cached CPICH Ec/NO value included in the RACHmeasurement report. Note that this value is of the current celi [j

D DRD_ECNOnbeIİ is the DRD threshold (DRDEcNOThreshhold) of the neighboring ceil

• 3. The RNC selects a target ceil from the candidate celis for UE access. If the candidate ceil

list is empty, the RRC DRD fails. The RNC performs RRC redirection. If the candidate ceil list

contains more than one ceil, the UE tries a celi randomiy.

If the admission is successful, the RNC continues the RRC connection setup -,

procedure -

if the admission to a ceil falis, the UE tries admission to another ceil in the candidate

ceil list until an admission is successfui or ali admission attempts fail

D Ifail the admission attempts fail, then

The RNC makes an RRC redirection decision when the switch of RRCredirection after DRD failure (ConnectFailRrcRedirSwitch) is set to ON

The RRC connection setup fails when the switch of RRC redirection after

DRD faiiure (ConnectFailRrcRedirSwitch) is set to 0FF

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WCDMA Adrnission Control Algorithm and

Parameters

Parameters of RRC DRD

DRDEcNOTIıreshhoId

Pararneter name: Drd Ec!NO threshold

[ Recommendedvalue: 18,

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[ Copyright’ 2012 Huawe Tchnoogies Co., Ltd. Jl rights resere. Pagelli HUAWEİ

• DRDEcNOTlıreshhoId

Content: DRD Ec/No threshold for determining whether to perform the blind

handover. If the measured Ec/No of the curreni cei is greaterthan this

L parameter, this ceil can be the candidate ceil for DRD.

Value range: -24--O

[ Physical value range: -24O; step: 1

0 Physical unit: dB

Set this parameterthroughADD UINTERFREQNCELLIMOD

UİNTERFREQNCELL.

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EWCDMA Admission Control Algorithm andParameters [

RRC Redirection after DRD Failure [• Algorithm switch: [

DrSwitch-DR_ RRCDRD_SWİTCH

ConnectFailRrcRedirSwitch [• Target celi: inter-frequency neighboring celis or inter-RAT

neighboring ceIs

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• When the RRC DRD fails, the RNC performs RRC redirection if the DR_ [RRC_DRD_SWITCH subparameter of the DrSwitch parameter is set ta 1 and theswitch of RRC redirection after DRD failure (ConnectFailRrcRedirSwitch) is set toOniy_To_Inter_Frequency or Allowed_To_Inter_RAT. The purpose of RRCredirection after DRD failure is ta instruct the UE to set up RRC connection in aninter-frequency or an inter-RAT neighboring celi.

• The procedure of RRC redirection after DRD failure is performed in the foilowingsteps:

• 1. The RNC seiects ali inter-frequency cells of the current celi.• 2. The RNC selects candidate celis. The candidate celis are the celis selected in step

1 but exclude the cells that have carried out inter-frequency RRC DRD attempts.• 3. The RNC selects a target celi from the candidate celis for UE access.

If more than one candidate ceil is available, the RNC selects a ceil randomiyand redirects the UE to the celi.If the admission is successful, the RNC continues the RRC connection setupprocedure.If the admission attempt fails, the UE tries admission ta another celi in thecandidate celi list.If no candidate ceil is available, or ali the admission attempts fail:

• If CoıınectFaiiRrcRedirSwitch is set ta Only_Tojnter_Frequency,the RRC connection setup fails.

• If ConnectFailRrcRedirSwitch is set ta Allowed_To_Inter_RAT,then:

a. If a neighboring GSM celi is configured, the RNC redirects theUE ta that GSM ceil.

b. If na neighboring GSM ceil is configured, the RRC connectiansetup fails.

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WCDMAAdmissiorı Control Algorithm andParameters

Parameters of IAC RRC Redirection

ConnectFallRrcRedirSwitch

Parameter name: RRC Redirection Switch for Admission

Fa1ure

Recommencled value: OnIy_To_I nter_Frequency

• ConnectFallRrcRedirSwitch

Content: RRC redirection switch used in the case of admission fallure. it is

valid oniy when the “DR_RRC_DRD_SWITCH” parameter iş set ta ON. - 0FF

indicates that the RRC redirection is not allowed. - Oniyjojnter_Frequency

inif thf nnlv RRC redirectjon to jrıter-frequency celis is allowed. -

Allowed_TojnterRAT indicates that both RRC redirection ta inter-frequency

celis and redirection ta inter-RAT celis are ailowed.

Value range: 0FF, OnIy_To_lnter_Frequency, Ailowed_To_Inter_RAT

Physical value range: 0FF, Oniy_TojnterFrequency,

Ailowed_To_l nterRAT

Set this parameterthrough SET UDRD.


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WCDMA Admission Control Algorithm ndParameters

Contents


2.4.1 AC During RRC Connection Setup

2.4.2 Directed Retry Decision During RAB Procedure

2.4.3 Rate Negotıatıon atAdmısson Control

2.4.4 Admission Decision

2.4.5 Preemption

2.4.6 Queuing

2.4.7 Low-Rate Access of the P8 BE Service

2.4.8 IAG for Emergency CaIIs


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IAC-RABDRD

• Purpose

Seleot a suitable ceil for a UE to access according to the HSPA+

technoiogical satisfaction, service priority, and ceU bad

• Scenario

RAB setup

o RAB modification

0 DCCC channel reconfiguration

• Non-periodic DRD:

Inter-frequency DRD

0 Inter-RAT DRD.

• During the RAB processing, non-periodic DRD is used to select a suitable ceil for a

UE to access according to the HSPA+ techr-ıobogical satisfaction, service priority, and

ceil bad. Non-periodic DRD is performed during RAB setup, RAB modification, or

DCCC channel reconfiguration.

• By using inter-frequency DRD, the RNC selects the qualified candidate celis by

considering HSPA+ technobogical satisfaction, cebi service priority, and celi oad. Then,

the RNC sequences the candidate celis according to the priority. According to the

sequence from the highest to the bowest, the UE tries accessing the celis until it is

admitted or it fails to access any celi.

• If the UE faHs to access any ceil in the case of inter-frequency DRD, inter-RAT DRD

wiil be triggered.


Permission

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Contents


2.4.1 IAC During RRC Conneotion Setup

2,4.2 Directed Retry Decision During RAB Procedure



2.4.5 Preemption

2.4.6 Queuing

2.4.7 Low-Rate Access of the P5 BE Ser’ice

2.4.8 IAC for Emergeney Caits

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• MBR: Maximum Bit Rate

• GBR: Guaranteed Bit Rate


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WCDMAAdmission Control Algorithm andParameters

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IAC - Rate Negotiation

Rate negotiation includes:

PS MBR negotiation

PS GBR negotiation

Initia rate negotiation

Target rate negotiation

L

WCDMA Admission Control Algorithm andParameters F

P8 MBR Negotiation

• If the lE ‘Alternative RAB Parameter Values” is present in

the RANAP RAB ASSIGNMENT REQUEST or the

RELOCATİON REQUEST message when a PS service is

set up, reconfigured, or handed over, then the RNC and the

ON negotiate the rate according to the UE capability to

obtain the MBR whHe ensuring a proper QoS

[TCopyright 2012 Kuawei Technoi isCo. lid, AU nghts reserved. [

• For the PS streaming service, when PS_STREAMJU_QOS_NEG_SWITCH [subparameter of the PsSwitch parameter is set to 1, the lu QoS negotiation function

is enabled for MBR negotiation.

• For the PS BE service:

When both PS BE IU QOS NEG SWITCH and1”

PS_BE_STRICTJU_QOS_NEG_SWITCH subparameters of the PsSwitch fparameter are set to 1, the lu QoS negotiation function is enabled, and the

RNC determines the MBR of lu QoS negotiation based on the informationabout UE capability, ceil capability and rate requested by the CNother settings. LWhen PS BE IU QOS NEG SWITCH is set to 1 andPS_BE_STRICT_IU_QOS_NEG_SWITCH is set to 0, the lu QoS negotiationfunction is enabled, and the RNC determines the MBR of lu QoS negotiationbased on the maximum rate supported by the UE rather than the ceH capabilityand othersettings. jL <‘-

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Parameters

Parameters of PS MBR Negotaation

• PsSwıtch-PS_STREAMJQQOS_NEG_SWITCH

Parameter name: PS rate negotiation switch for Streaming service

Recommended value: 0FF

• PsSwftch-PS_ BEJU.QOŞfiEG.SWİTCH

Parameter narne: PS rate negotFation switch for BE şrvice

Recomnınded value: 0FF

• PsSwftch-PSfiE_STi?ICTJU_QOS_NE..SWİTCH

o Parameter name: PS rate negötiation switch for strict BE service


• PsSwitch-PS_STREAMJQQOS_NEG_SWİTCH

Content: When the switch is on, the lu QoS Negotiation function is applied to the PS STREAM

service if Alternative RAB Parameter Values lE is present in the RANAP RAB ASSIGNMENT

REQUEST or RELOCATION REQUEST message.

Value range: 0FF, ON

Physical value range: 0, 1

• PsSwitch-PS_ BEJLI_QOS_NEG_SWITCH

Content: When the switch is on, the lu Q0S Negotiation function is applied to the PS BE service

ifAlternative RAB ParameterValues lE is presentin the RANAP RAB ASSIGNMENT

REQUEST or RELOCATİON REOUEST message.



• PsSwifch-PS_BE_STRİCTJU_QOSfiEG_SWITCH

a Content: When the switch is on, the strict tu Q0S Negotiation function is applied to the PS BE

service, RNC select lu max bit rate based on UE capacity, celI capacity, max bitrate and

alternative RAB parametervalues in RANAP RAB ASSIGNMENT REQUEST or RELOCATİON

REQUEST message. When the switch is off, the loose lu QoS Negotiation function is applied to

the PS BE service, RNC select lıı max bit rate based on UE capacity, max bitrate and

alternative RAB parameter values in RANAP RAB ASSIGNMENT REOUEST or RELOCATİON

REQUEST message, not consider ceit capacity, this can avoid lu QoS Renegotiation between

different celI. The switch is valid when PS_BE_1U_QOSJ’IEG_SWITCH is set to ON.



• Set these parameters through SET UCORRMALGOSWITCH.

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PS GBR Negotiation rDuring the setup, reconfiguration, or handover of a real-time

PS service

if the PS_STREAMJU_QOS_NEG_SWITCH subparameter of [the PsSwitclı parameter is set to 1, the RNC selects the

maximum rate as the GBR of this RAB and sends itto the CN.

If the PS_STREAMJU_QOS_NEG_SWITCH sub-parameter

of the PsSwitch parameter is set to 0, the GBR negotiation wiil

be not performed.

izE

• the RNC wili negotiate with the CN about the GBR as follows:

If the lE “Type of Alternative Guaranteed Bit Rate Information” in the RABASSIGNMENT REQUEST message is set to “unspecified”, the GBRnegotiation wilI not be performed. in such a case, the GBR contained in the lE L.“RAB Parameters” of the RAB ASSIGNMENT REQUEST message is used. inaddition, the subsequent RAB ASSIGNMENT RESPONSE message does not (contain the GBR.

if the lE “Type of Alternative Guaranteed Bit Rate Information” in the RABASSIGNMENT REQUEST message is set to “vaiue range”, the sole GBRcontained in the lE “Alternative Guaranteed Bit Rates” is used. in addition, thesubsequent RAB ASSIGNMENT RESPONSE message contains the GBR.

n If the lE “Type of Alternative Guaranteed Bit Rate Information” in the RABASSIGNMENT REQUEST message is set to “Discrete values”, the largestGBR contained in the lE “A!ternative Guaranteed Bit Rates” is used. inaddition, the subsequent RAB ASSIGNMENT RESPONSE message containsthe GBR. (

L


WCDMA Admission Control Agorithm and

Parameters

Initial Rate Negotiation• For a BE service in the PS domain, the RNC selects an initial rate

to atlocate bandwicith for the service before the admission request

based on ceil resources in the following cases:

A service is set tıp

[ The UE state changes from CELL_FACH to

• The negotiation is based on the celi bad information, which

includes:

Upbink and downlink radlo bearer status of the celi

Minirnum spreading factor (SF) supported

HSPA capability

[Tr Copyright 20i2 NuaweTechnoogjes Co, ttd:Ms Pagel2l

Purpose: Enable UE admission et an appropriate rate based on the service requested

by the LJE and the sig nal quality of the ceil

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Confidential Informetion of Huawei. No Spreading Without

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Initial Rate Negotiation (ConL)

Initial rate definition for DCI-1 services:

• As described in the table, when the two switches are ON, the initial rate is dynamically

set on the basis of Ec/No in the downlink. The specific method is as follows:

When receiving an RRC connection setup request, the RNC starts the timer

EcNOEffectTime.

Before the timer expires, the RNC dynamically sets the initial rate based on

the P-CPICH Ec/NO carried in the RRC CONNECTION REQUEST message: fIf the celi Ec/NO reparted from the UE is above the Ec/NO threshold

(EcNOThs), the RNC sets the actual initial rate ta the smaHer one of the

MBR and 384 kbitls. Note that if the UE is in the soft handover state,

the RNC sets the actual initial rate to the smaller one of the MBR and

384 kbit/s when any of the ceHs in the active set meets the threshold.

If the celi Ec/NO is below or equal ta the Ec/NO threshold (EcNOThs) or

the RRC CONNECTION REOUEST message does not carry the

information about Ec/NO, the RNC sets the actual initial rate ta the

smaller one of the MBR and the initial rate of the downlink BE service

(DI BeTraffl nitBitrate).


t

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‘T,Ç

in the uplink, the initial rate is the smaller one of

ON ON the MBR and 384 kbit!s. [t5t

in the downUnk, the initial rate is dyaamicafly setarı the basis of Ec/NO.

in the uplink, the Initial rate is the smaller one ofthe MBR and the inWai rate of the uplink BE

ON 0FF service (UlGeTrafflnitBitrate).in the down link, the initial rate is the smaller oneof the MBR and the initial rate of the downlinkBE service (DlBeTrafflnitBitrate)

0FF - MBR

[

CE

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Parameters of Initial Rate Negotiation

• DraSwitch-DRA_DCCC_SWITCH

Parameter name: Dynamic resource allocation switch for

DCCC

Recommended value: ON

• PsSwitch-PS_BE_İNIT_RA TE_DYNAMIC_CFGSWITCH

° Parameter name: PS rate negotiation switch for initial rate

reconfiguration


• DraSwitch-DRAJJCCC_SWITCH

o Content: When the switch is on, the dynamic channel reconfiguration control

algorithm is used for the RNC.



• PsSwitch-PS_BE_INIT_liA TEDYNAMICCFGSWITCH

° Content: When the switch is on, the initia rate of the service shoud be

dynamically configured according to the value of Ec/No reported by the UE

when the PS BE service is established.



• Set these parameters through SET UCORRMALGOSWITCH.


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izWCDMA Admission Control Algorithm andParameters


• EcNOEffectTime

Parameter name: EcINO effective time

Recommended value: 5000, namely 5000ms [• EcNOThs

Parameter name: Ec/NO threshoid

Recommended vaiue: 41, nameiy -4dB

• DlBeTraffİnitBitrate rParameter name: DL BE traffic Initial bit rate

Recommended value: D64, namey 64kbit/s

co Content: This parameter specifles the time duration when the reported Ec/No

is valid. The reported Ec/No is valid for the period (starting from the time whenthe RRC connection request is initiated) specified by this parameter.Value range: 0—65535

o Physical value range: 0-65535; step: 1Physical unit: msSet this parameterthroughADD UCELLFRC/ SET UFRC.

• EcNOThsThreshold for determining the signal quality in a ceil. If the reported Ec/Noexceeds the value of this parameter, you can infer that the signal quality in theceil is good and a high code rate can be set for initial access. Actual Value =

(GUI Value - 49(offset)) x 0.5.o Value range: 0-49 Lo Physical value range: -24.5--Ü (0: -24.5, 1: -24 49: 0)

Physical unit: dBo Set this parameterthrough ADD UCELLFRC/ SET UFRC. L

• DiBeTraftinitBitrateo Content: DL initial access rate of PS background or interactive service. When

DCCC function is enabled, the downlink initial access rate wili be set to thisvaiue if the downlink maximum rate is higherthan the initial access rate.

o Value range: D8, D16, D32, D64, D128, D144, D256, D384Physical value range: 8, 16, 32, 64, 128, 144, 256, 384

o Physical unit: kbitlso Set this parameterthrough SET UFRC.


(T

• EcNOEftectTime

WCDMA Admission Control Aigorithm and

Pararneters

Initial Rate Negotiation (ConL)

• Initial rate of HSDPA services: GBR

Initial rate definition for HSPA services:

If the DRAHSUPA_DCCC_SWITC 1-1 subparameter of the

OraSwitch parameter is set to 1, the actual initial rate is the————.-,

-

initial rate of the HSUPA BE service (HsupalnitialRate).

If the DRA_HSUPA_DCCCSWİTCH subparameter of the

DraSwitch parameter is set to 0, the actual initial rate is the

MBR. ‘—?O

___

----

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• DraSwitch-DRA_HSUPA_DCCC_SWITCH

Parameter name: Dynamic resource aflocation switch for

HSUPA DCCC


• HsupalnitialRate

Parameter name: initial rate of HSUPA BE trafflc

Recommencied value: D256, nameiy 256kbitls

• DraSwitch-DRA_HSUPA_DCCC_SWITCH

Content: When the switch is on, the DCCC algorithm is used for HSUPA. TheDCCC switch must be also on before this switch takes effect.


Physica value range: 0, 1

Set this parameter through SET UCORRMALGOSWITCH.

• HsupalnitialRate

Content: HSUPA BE traffic Initial bit rate. When DCCC algorithm switch andHSUPA DCCC algorithm switch are enabled, the uplink initial bit rate wili beset to this vaue if the uplink max bit rate is higher than the initial bit rate.

Value range: D8, D16, D32, D64, D128, D144, D256, D384, D608, D1440,D2048, D2880, D5740

o Physical value range: 8, 16, 32, 64, 128, 144, 256, 384, 608, 1440, 2048, 2880,5740

Physical unit: kbitls

o Set this parameter through SET UFRC.

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Parameters

Target Rate Negotiation

• For a BE service in the PS dornain, if the ceil resource

based admission at the initial rate fai!s, the RNC selects a

target rate to aHocate bandwidth for the service based on

ceil resource in following cases:

Service setup

Soft handover

DCCC rate upsizing

O12I4uawe TchnoogieS Co, Ud, JI ıights reserved,. Pagel27 HUAWEI

• If the ceil has sufficient code and CE resources, the RNC sets the candidate target

rate ta the one that matches the ceH resource surplus. Then, the RNC sets the target

rate ta the greater one of the candidate target rate and the GBR.

• in the case of soft handover, the actual target rate is the candidate target rate set by

the RNC.

• in the case of DCCC rate upsizing, if the rate upsizing falls, the target rate is the

greater one of the candidate target rate and the pre-upsizıng DCCC rate.

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Permission


j Contents



2.4.2 Directed Retry Decsion During RAB Procedure

2.4.3 Rate Negotiation at Admission Contro

2.4.4 Admission Decsion

2.4.5 Preemption

2.4.6 Queuing

2.4.7 Low-Rate Access of the PS BE Service

2.4.8 İAC for Emergency Calls


[


Parameters

Admission Decision

• After rate negotiation, RNC makes admission decision.

e The admission decision performed by CAC is based on

resources, such as code resources, power resources,

NodeB credits, and Iub resources

• f the admission is successful, UE access is granted.

Otherwise, the RNC performs the next step


Permission

WCDMA Admission Control Afgorithm andParameters

Contents

2. tAO (Intelligent Access Control) -



2.4.3 Rate Negotiation at Admission Controt


2.4.5 Preemption

2.4.6 Queuing


2.4.8 İAC for Emergeney CaHs

1!



Parameters

IAC - Preemption

• By forcibiy releasing the resources of Iower-priority users, the

preemption function increases the access success rate of

higher-priority usera

• Precondition of preernption and queuing:

According ta RAB ASSIGNMENT REQUEST message,

preemption and queuing are supported

mpııon (0)

p.ernptioVuİnrabıI oI-pre-empt6lg (0)

queuIn]lLed:ueuein-?fowed (1)

The preemption algorithm switch (PreemptAgoSwitch) is set to

ON-

-

Copyright C 2012 Hua ogies Co., Ltd. Ali nghts reserved. Pagel3l HUAW€I

• Preemption and queuing guarantee the success in the access of a higher-priority user

by forcibiy releasıng the resources of a ower-priority user.

• Preemption and queuing are applicabie ta the following scenarios:

Setup or modification of a service

Hard handover or SRNS reocation

UE state transition from CELL FACH to CELL_DCH

ulİ ir öi:ı


Perm iss jan


. The following table describes the selection of the target ceil for preemption or queuing:

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izc

DRD Power ased Code BasedSwtch for DRD Swıtch DRD Swıtch

Servıce for Load for Load Target Celi for Preemptıorı or Queuıng

Steering Balancing Baiancing

ON- The celi with the Iightest bad among the ceHs with the

- ON highest service priority.

The ceit with the highest service priority. If there areON multiple such candidate cells, the target ceil is selected

as follows:0FF 0FF If the current celi is one of the candidate celis, the

current ceM is selected as the target ceM.Otherwise, a neighboring celi that supports blindhandover is selected randomiy trom the candidate celis.

ON -

The ceM that supports the servıce and has the owestbad. If there are multiple such candidate celis, thetarget ceil is selected as follows:If the current ceil ıs one of the candidate celis, the

- ON current ceM is selected as the target ceM.

0FF Otherwise, a neighboring ceM that supports blindhandover is selecied randomly from the candidate cells.

Preferably the current celi. If the current ceil does not

0FF 0FFsupport the service, a ceil is selected randomiy from thecefls that support this service and support blindhandover

Preemption Procedure

‘ 1. The RNC selects the target celi for preemption

For DC-HSDPNDC-HSUPA services, the RNC seiects the

primary celi in the DC-HSDPNDC-HSUPA ceil group as the

target celi

For non-DC-HSDPNnon-DC-HSUPA services, the RNC

selects a sultable ceil with higher service priority or Iower İoadfL’ l-

.2-

4 c,u,_,_c

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4

13

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[

WCDMAAdmission Control Algorithrn andParameters

Preemption Procec{ure (Cont.)

2. The preemption algorithm determines the radio link sets

to be preernpted

a. Selects SRNC users first. If no user under the SRNC is

available, the algorithm selects users under the DRNC.

b. Sorts the preemptable users by user integrated priority, or

sorts the preemptable RABs by RAB integrated priority.

c. Determines candidate users ör RABs>1Q CJJ( 3J’

/J(

Copyright 2012 I-uawei Tehnokies Ca., LUi AU rights reserved. Pagel 33 j’ HUAWEI

• The foHowing table describes the preemption for differenttypes of service on different

resources.

ServiceThat Can Be PreemptedService Resource

R99 HSUPA HSDPA R99+HSPA

Code q -q

R99 Power q -1

service CE q - q

lubbandwidth J q

Code - - -

HSDPA Power q - q q

service CE --

- -

Iubbandwidth q -

Code -- -

-

HSUPA Power q - q

service CE q q -

lub bandwidth -

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WCDMA Admisson Control Algorithm andParameters

Preemption Procedure (Cont.)

• 3. The RNC releases the resources occupied by the

candidate users, RABs, or RRCs.

e 4, The requested service directly uses the released

resources to access the network without an admission

decision.

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(T’

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E


Forced Preemption

in forced preemption, oniy CS conversational services can

trigger preemption and oniy PS BE services can be

preempteci.

«

• Common preemption requires that RABs have been set up or are being set up for

preempting users and that preempting users have higher priorities than preemptable

users. Therefore, CS services cannot trigger preemption in the RRC connection setup

phase. Even in the RAB-related phases, CS services may fail to preempt PS services

because of insufficient priorities. When PS traffic volume is high and radio resources

are insufficient, the success rate for CS service setup may decrease. To solve this

problem, forced preemption is introduced. This function ensures preferred access of

AMR services and a high success rate for AMR service setup.


Permission

L‘T

WCDMA Admission Controt Algorithm andParameters 1

Forced Preemption

Forced Preemption function is determined by the

RsvdParal parameter which consist of two sub

parameters:

° RSVDBIT4 indicates whether CS services can preempt the

resources for PS services during a CS RRC connection setup.

o RSVDBIT5 indicates whether CS services can preempt the

resources for PS BE services during a CS RABreIated phase.

RAB admission for CS

onversationaI services fai!s, PS BE

,ervices can be preempted

urıconditionaliv.

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(2ç

‘TİZ

. The following table describes how these two sub-parameters determine preemption.

S conversationai services cannotOn 0ff

reempt P5 BE services.

f RRC admission for CS If RAB admission for CS

onversational services fails, PS BE onversational services fails, PS BEOn On

ervices can be preempted ;ervices can be preempted

unconditionally. ınconditionally.

f RRC admission for CS ommon preemption is performed.

;onversational services fails, PS BE rhat is, service priorities and the Pre-0ff On ervices whose Pre-empticn ımption Capability and Pre-emption

fulnerability lE is set to pre- /ulnerability Es determine whether to

mptable” can be preempted. erform preemption.

ommon preemption is performed.

•hat is, service priorities and the PreS conversational services cannot

0ff 0ff mption Capability and Pre-emptionıreempt PS BE servıces.

‘ulrıerability lEs determine whether to

erform preemptiorı.


Parameters of PremptiOh

• PreemptAlgaSwifch

Parameter name: Preernpt algorithm switch

Recommended vaue: 0FF

• svdParal

Parameter name: Reserved pararneter 1

Recommended va!ue: RSVDBITİ-OaRSVDBIT2-

O8RSVDBıT3-oaRSVDBıT4-O8RSVDBIT5-oaRSVDBıT6-

08RSVDBlT7-ORSVDB IT8-0RSVDBT9-08RSVDBIT1 0-

08RSVDBIT1 1 -08RSVDBITI 2-0RSVDBITI 3-

08RSVDBIT1 4.-O8RSVDBITI 5-08R$VDBIT1 6-0

PreemptAlgoSwitch

Content: Determines whether preemption is supported. When this switch is

enabled, the RNC aUows privileged users or services to preempt ceil

resources from the users or services with the preempted attributes and Iower

priority in the case of ceII resource insufflciency. When the switch is disabled,

the RNC terminates the service for the user due to the failure in celi resource

appication.


Physical vaue range: 0, 1

o Set this parameter through SET UQUEUEPREEMPT.

RsvdParal

Content: Reserved parameter 1.

Value range: RSVDBIT1(Reserved Switch 1), RSVDBIT2(Reserved Switch 2),

RSVDBIT3(Reserved Switch 3), RSVDBIT4(Reserved Switch 4),

RSVDGIT5(Reserved Switch 5), RSVDBIT6(Reserved Switch 6),

RSVDBIT7(Reserved Switch 7), RSVDBT8(Reserved Switch 8),

RSVDBIT9(Reserved Switch 9), RSVDBITİO(Reserved Switch 10),

RSVDBITİ 1 (Reserved Switch 1 1), RSVDBITİ2(Reserved Switch 12),

RSVDBITİ3(Reserved Switch 13), RSVDBITI4(Reserved Switch 14),

RSVDBITİ5(Reserved Switch 15), RSVDBITI6(Reserved Switch 16)

Set this parameter through: ADD UCELLALGOSWITCH/MOD UCELLALGOSWITCH.


Permission


L(D

: Contents


2.4.1 IAC During RRC Conneotion Setup


2.4.3 Rate Negotiation et Adrnission Control

2.4.4 Adrnişsion Decision

2.4.5 Preemption

2.4.6 Queuing


2.4.8 LAC for Emergenoy Calls


[


Parameters

IAC - Queuing Cptj pS

For PS services, after preemption fails, the RNC performs

queuing if the foilowing conditions are met:

° The RNC receives a RAB ASSIGNMENT REQUEST message

indicating that queuing is supported

° The queuing algorithm switch (QueueAlgoSwitch) is set to ON

The queuing function is triggered by the heartbeat timer that

is set by the PoliTimerLen parameter. Each time the tirnerwr <ç İ(O L,i (‘

expires, the RNC selects the service that meets the

requirement to make an admission attempt

O( (X ii

Copyrıght © 2012 Huaeı TeJıoog,es Co Lid Al’ nçhts reserved Pagel3S I-İUAW€(

• The UE requesting DC-HSDPA services wiU be queued in the selected anchor-carrier

cel 1

• The queuing function takes the following actions:

The queuing algorithm checks whether the queue is fuli, that iş, whether the

number of service requests in the queue exceeds QueueLen.

The queuing algorithm decides whether to put the request into the queue, as

described in the following table

If the queue is.... Then the ueuing aigorithm.

. Stamps this request with the request time (T_request).

Not fuli • Puts this request into the queue.• Starts the heartbeat timer if it is not started.

Checks whether the integrated priority of any existing request is

Iower than that of the new request.

cı • Ifyes, then the queuing algorithm:

; rliı - Checks the queuing time of each request. The algorithm

removes the request with the longest queuing time from the

FuU queue.- Stamps the new request with the request time (T_request) and

then puts it into the queue.- Starts the heartbeat timer if it is not started.

• f no, then the queuing algorithm rejects the new request

directly.


Permission

1;E


Parameters of Queuing

• QueueAlgoswitch

o Parameter name: Queue aigorithm switch

o Recommended value: 0FF

• MaxQueueTimeLen

Parameter name: Max queuing time Iength

Recommended vaiue: 5, nameiy 5s

Content: Indicating whether queue is supported. When a user initiates a cail, ifceil resources are insufficient and the user is queue supportive, the RNC triesto arrange this user to join the queue to increase access success ratio.


Physicai value range: 0, 1

• MaxQueueT!meLen

Content: Maximum queue time of users. When a user initiates a cail, itjoinsthe queue due to ceil resource insufficiency. This parameter defines themaximum Iength of time required for queuing of a user. if ceil resources are

stili insufficient after expiration, access fails.

Value range: 1-60

o Physical value range: 1-60; step: 1

o Physical unit: s

• Set these parameters through SET UQUEUEPREEMPT.


(Tii;

t.,t.’E,t:

E• QueueAlgoSwitch

D

r

WCDMA Admission Contro! Algorithm and

Parameters

: Contents




2.4.3 Rte Negotiation at Admission Contro

2.4.4 Aclmission Decision

2.4.5 Preemption

2.4.6 Queuing


2.4.8 IAC for Emergency Calts

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[

IAC - Low-Rate Access of the PS BEService• Low-rate access means access from the DCH at 0 kbit/s,

FACH, or enhanced FACH (E-FACH)

e Low-rate access is used in the following scenarios:

RAB setup

Hard handover or SRNS relocation

IT

rt:

• f the PS_BE_EXTRALOW_RATE_ACCESS_SWITCH su bparameter af the PsSwitch

parameter is set to 1, the PS BE service can access the target ceil at a Iow rate in the

case of a preemption or queuing failure to increase the access success rate.

• After a service request is rejected, the low-rate access actions in different scenarios

are as follows:

(z

RAB setup The RRC connection is set up on the FACH or E-FACH.

Lx

11The RRC connection is set up on the DCH. X

The RRC connection is set up on the HSPA channel. X

The CS service is set up, and a new PS service is ta be set up. X

The existing PS service is set up on the FACH/E-FACH, and a q xnew PS service is ta be set up.

The existing PS service is set up on the DCH, and a new PS Xservice is ta be set up.

The existing PS service is set up on the HSPA channel, and a X ‘J (the new PSnew PS service is ta be set up. service can be

admitted at 0 kbit/s)

[E

The PS service is set up, and a new CS service is ta be set up. x >(

Hard Hard handover or relocation is performed for the CS+PS X ‘]<only the PShandover combined services. service can beer admitted at 0 kbit/s)reocation

Hard handover or relocation ıs performed for the PSı-PS X qcombined services.


WCDMA Admission Control Algorithrn andParameters

Parameters of Low-Rate Access of the

j PSBEService

PsSwitch

PS_BQEXTRA.LOW_RA TE_A CCESS.SWITCH

Parameter narne: P8 rate negotiation switch for 0w rate

LJ access

Recommended vatue: 0FF

ZeroRateUpFailToF?elTimerLen

Pararneter narne: Refease 0 kbit/s Timer tength for failed to

rate up .

Recommended vatue: 180, nameiy 180s ‘

-wCcpyrighf C’ 2012 Huawe TctrnoIcgies Co., Lid. nghts ıserved.’’g145 HUAWEI

PsSw!tch-PS_BE_EXTRA_LOW_RATE4CCESS_S WITCH

Content: When the switch is on, access at a rate of 0 kbit/s or on the FACH is

determined according to the current connection state of the RRC if the PS BE

admisson and the later preemption and queuing fail.

Vatue range: 0FF, ON

Physicat value range: 0, 1

Set this parameter through SET UCORRMALGOSWITCH.

e ZeroRateUpFallToRe!TimerLen

Content: For the PS BE service at a rate of 0 kbit/s, this parameter is used for

the rate upsizing for DCCC triggered by event 4A. Unsuccessful rate upsizing

indicates that the resources are insufficient in the cef 1. The service may run at

a rate of 0 kbitls for a tong time. If the timer is started, the 0 kbit/s service of the

UE is released after the timer expires. If the tength is set to 0, the timer is not

started.

Value range: 0—65535


Physical unit: s

Set this parameter through SET UC0IFTIMfi.


Permission


E’ Contents

2. IAC (Intelugent Access Control)

24.1 İAC Durng RRC Connection Setup




2.4.5 Preernption

2.4.6 Queuing

2.4.7 Low-Rate Access of the P5 BE Service

2.4.8 IAC for Emergency Calis


L[.


• Compared with the RRC connection setup process of common services, the RRC

connection setup process of emergency calis incorporates the preemption due to hard

resource-based admission failure. Hard resources indude code, Iub, and CE

resources.

• To guarantee a successful acimission of an emergency cali, the RNC does not

perform RRC redirection for service steering.

• in the case of power-based admission, the emergency cali is admitted regardiess of

whether the CAC function is enabled or not.

• in the case of hard resource-based admission, the emergency cail is admitted if the

current remaining resources are sufficient for RRC connection setup. If the admission

fafis, preemption is performed regardiess of whether the preemption is enabled or not.

The emergency cail that triggers preemption has the highest priority. The range of

users that can be preempted is specified by the EmcPreeRefVulnSwitch parameter.

If EmcPreeRefVulnSwitch is set to ON, ali non-emergency users that have

accessed the network can be preempted, regardiess of the preemption

prohibited attribute of the users.

If EmcPreeRefVulnSwitch is set to 0FF, oniy the non-emergency users with

preemption-aliowed attribute can be preempted.

The principles for selection of specific users to be preempted are the same as

those for commom services.


Permission

IAC for Emergency Calis

RRC connection setup process of emergency calis:

u No admission on power resource

are sufficient

o Admission is successful if the current remaining hard resources

if the hard resource admission faiis preemption is performed

regardiess of the preemption switch

Sucteeds

t:1*

WCDMA Admission Control Algorithm andParameters r

IAC for Emergency Calis (Cont.)

RAB Admission of Emergency Calis:

a For power resource admission:

‘ When EMC_UU_ADCTRL is on, power admission falls if the

system is in overload. Otherwise, the admission succeeds

• If the CAC algorithm switclı is off, the emergency calis are direotiy

admitted

Admission is successful if the current remaining hard resources

are sufficient

_________ ______

t:t:

• Compared with the RAB process of common services, the RAB process ofemergency calls incorporates special processing of resource-based admission andpreemption.

• RAB admission of emergency calls:

in case of power resources:

if the CAC function is enabled, regardiess of which aigorithm isselected, the admission decision-making is as foilows:

a. When the EMC_UU_ADCTRL subparameter of the 1>NBMCacAIgoSwitch parameter is set to 1, power-basedadmission faiis if the system is in the overioad corıgestiorı state.Otherwise, the admission succeeds. ii

b. When this subparameter is set to 0, the emergency calis are -•

directly admitted.

if the CAC function switch is off, the emergency calis are directlyadmitted. [

For hard resources (that is, code, iub, and CE), the resource-based admissionis successful if the current remaining resources are sufficient for the request.



IAC for Emergency Calis (Cont.)

Preemptıon of Emergenoy Calis

If ceil resourcebased admission falis, preemption is performed

regardess of whether the preempt function is enabled or not.

If EmcPreeRefVulnSwitch is set to ON, aB non-emergency

users that have accessed the network can be preempted,

regardless of the preemption-prohibited attribute of the users.

If EmcPreeRefVulnSwitch is set to 0FF, oniy the non

emergency users with preemption-allowed attribute can be

preempted.


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t:WCDMA Admission Corıtrol Algorithm andParameters

Parameters of IAC for EmergencyCalis [T• EmcPreeRefVulnSwitch ç

o Parameter name: Preemptvuinerability for Emergency cail

switch


• NBMCacA!goSwitch-EMC_UU_ADCTRL [o Parameter name: Ceil CAC aigorithm switch for UU resource of

emergency cali [To Recommended value: ON

EE

Content: When the switch is enabled, users attempting emergency caH canpreempt the resources from ali the accessed users for non emergency cali.When the switch is disabled, users attempting emergency cali can oniypreempt resources from the users for non emergency cafl when they areconfigured with the preempted attributes and ARP information element.



o Set this parameterthrough SET UQUEUEPREEMPT.

• NBMCacAIgoSwitch-EMC_UU_ADCTRL

o Content: Control power admission for emergency user.


Physical vaiue range: 0, 1 (Set this pararneter through ADD UCELLALGOSWITCH/ MODUCELLALGOSWITCH.

t:L

Confidential information of Huawei. No Spreading WithoutPermission

EmcPreeRefVulnSw!tch

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Course Name

Summary

CAC Based on

Code Resource

Power Resource

NodeB Credit Resource

Iub Resource

o The Number of HSPA Users

IAC During RRC Connection Setup or RAB Procedure


Permission P-1 51

WCDMA Admission Controf Agorithm andarameters

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