5wcdma Ran14 Radio Net Fea Alg Tr2 Ac Cac

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WCDMA RAN4 Radio NetworkFeatures and AlgorithmsTraining Il

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HUAWEI Contents

Contents1 WCDMA RAN4 Admission ControlAlgorithm and Parameters

2 WCDMA RAN4 Load Congestion ControlAlgorithm and Parameters

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WCDMA Admission C ontrol Algoritiim andParameters

WCDMARANI4Admsson ControlAlgorithm andParameters

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L.WCDMA Admission Control Algorithm andParameters: Foreword

The WCDMA system is a seif-interfering system, so thecapacity, coverage, and QoS are mutualiy affected

The target of bad control is to maximize the systemcapacity while ensuring coverage and QoS, and proviciedifferentiated services for users

The WCDMA system is a seif-interfering system. As the bad of the system increases,the interference rises. A relativeiy high interference can affect the coverage of celisand QoS of established services. Therefore, the capacity, coverage, and QoS of theWCDMA system are mutually affected. To solve these problems, the bad controlfunction is introduced that controbs the bad in a celi.

Load control aims to maximize the system capacity while ensuring coverage and QoSby controlling the key resources, such as power, downlink channelization codes,channel elements (CEs), and Iub transmission resource, which directly affect userexperience.

Each ceM has its own set of bad control functions that are responsible for monitoringand controlling the resources of the ceil. The bad control functions monitor the badcondition of the ceil through bad measurement, make the admission decision forservices through intelligent access control and cali admission control, and relievecongestion in a celi

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WCDMA Admission Control Algorithm andParamete rs

References 3GPP TS 25.133: Requirements for Support of Radlo ResourceManagement (FDD)3GPP TS 25.215: Physica[ Laye r - Measurements (FDD)

3GPP TS 25.3 04: UE Procedures in Idle Mode and Procedures forCeil Reselection in Connected Mode

3GPP TS 25.321: Medium Access Control (MAC) Protoco lSpec ification

e 3GPP TS 25.331: Radio Resource Con trol (RRC) 3GPP TS 25.413: UTRAN lu nterface RANAP Signall rg

f 1cqr.

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WCDMA Admission Control Algorithm andParameters

ObjectivesUpon completion of ths course, yo u wili be able to:

Dutline the principle of bad con trolDescribe the rea llzation me thod of Cali Admission ControlDe scribe the reali zatio n metho d of lnteiligentAccess Control

o Perfor m the para mete r ad jstmen t of Gali Admission ControlPerform the parameter ad justmen t of Inteiligent Access Control

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WCDMA Admission Contro l Algo rithm andParameters

Contents1. Load Control Overview1.1 Load Controt Agorfthms Overview1.2 Load Measuremen t1.3 Prioritles lnvolved in Load Control


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WCDMA Adm isson Control Agorithm andParameters

Load Definition Load: the occupancy of capacity Two kinds of capacity in WCDMA system:

Hard capacity:a Ceti DL OVSF code

Iub transport resource NodeG processing capabllity (NodeB credit)Soft capacity: Celi power (UL and DL)

WCDMA network bad can be defined by fou r factors:Power, incl des DL transmitting power of ceil and increased UL interference(RTWP)DL OVSF code of a celi.DL and UL NodeB processing capabWty which is defined by NodeB credit.lub transmission bandwidth of a NodeB.

The power resource is related to the mobility, distribution of the UE and alsa effectedby the radio condi tions. Therefore, for a fixed power resource, the numbers of servicecan be supported is not a fix result. We believe the UL and DL power resources aresoft.



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WCDMA Admission Control Algor[thm andParameters

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[in addition, functionai bad control algorithms vary depending on the bad leveis of theceil, as shown in the folbowing figure:

NodeB TXpower (noise)Icons for different bad eveis D

(1Celi bad (number of subscribers) 0

Start OLC: check and relieve overloadcongestion in ceHs -Start IAC: increase the access rate in cells with

heavy bad by some actions while ensuring the Q0S

Start LDR: check and relieve basic congestion in celis

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Load Control AgorithmsThe bad control algorithms are applied to the different UEaccess phases as folbows:

> Laf.IAC: bntelligent Access ControlAC: Cali Admission Control

LDR: Load Reshuffling OLC: Overbcad Control

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WCDMA Admssion Control Algorithm andParameters

Load Control Algorithms (ConL)Resources considered by different oad control atgorithms:

ResourcesLoad Control Algorithm Power Code NodeR Credits Jub Bandwidth1 1IAC1 q qCAC

LDR - 1OLC q - - q : not cons idered; J: considered

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Contents1. Load Control Overview

1.1 Load Control Algorithms Overview1.2 Load Measurement1,3 Prioritles Involved in Load Controt

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WCDMA Admssion Control Algorithm andParameters

Load MeasurementLoad control function in the WCDMA system:

UE

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The oad control functions, such as OLC and CAC, use bad measurement values inthe uplink and the downlink . A common Lo ad Measurement (LDM) fun ction is used tocontrol boad measurement in the uplink and the downbink separately. Load control is impbeme nted in the RNC after obtaining measurement reports from theNodeBs .

The bad control functions are described as folbows:CAC: The function of CAC is to decide whether to accept resource requestsfrom UEs, such as access, reconfiguration, and handover requests, dependingon the resource status of the ceil.

D IAC: The func tion of IAC is to increase the access success rate with thecurrent QoS guaranteed through rate negotiation, queuing, preemption, anddirected ret ry decision (DRD).

D LDR: The function of LDR is to reduce the ceil bad when the celi enters thebasic congestion state.

D OLC: The function of OLC is to reduce the celi bad rap idiy when the cebb isoverboaded.


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WCDMA Admission Contr o Algorithm andParameters

Load Measurement QuantitiesThe major oad-reIated measurement quantities are asfollows:o Upnk Received Total Wideband Power (RTW P) Do wnb nk Transmitted Carrier Power (TCP) Non -HSPA pow er: TCP excluding the power used fortransmission on HSPA channelsProvided Bit Rate (P BR ) on HS-DSCH.

o Pow er Req uireme nt for GBR (GBP) on HS-DSCHPBR on E-DCH


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WCDMA Admission Control A lgorithm andParameters

Load Measurement Quantities (ConL)Received Scheduled E-DCH Power Share (RSEPS): power of the EDCH scheduling service in the serving ceilUpIink total bad: sum ot R99 serv ice bad, HSUPA ser vice bad, andcon trol channel bad

Upl ink miriimum guaranteed bad: sum of R99 serv ice boad, HSUPAservice bad requ ired by the HSUPA GBR, and control chan neb bad.

The HSUPA G8R is calcu lated as foltows: If the func tion uplink enhanced L2 is disabled, GBR max (bit ra te of one RLC

PDU , GBR). If the functi on uptnk enhanced L2 is enabled, G8R max (bit rate of the

smaliest RLC PDU, GaR).

Ccpyrght 2012 Huawei Technologies Co., Lid. AU ribts reserved. Pae HUAWEI

The NodeB measures the major quantities related to bad control. Af ter bayer 1 andtayer 3 fit ter ing, the rneasurementvalues are reported to the RNC through theCOMMON MEA SUR EMENT REPORT message. The RNC performs smooth filtering of the measurement values reported from theNodeB and then obtains the measurement values, wh ich further serve as data inputfor the bad control algorithms.

The RNC catcubates the actual upbink bad based on the RTWP, uplink total bad, andupbink minimum guaranteed bad. The actual upiink bad is one of the factors for theupbink boad-related abgorithms. t e b ,, rr)

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Rep ting PeriodThe Node8 periodicafly reports each rneasurement quantity to the RNC.Th e foUowing table Iists the reporting period parameters for settngdifferent measurement quantities:

RTWP ctoceRprtunitForuiBasicMeasRSEPS. TenMsecForUl8asicMeasMinFarUiBasicMeasTCP coiceRprtunitForoBasicMeasNor-HSDPA power TenMsecForDlBasicMeasUplfnk tata bad MinForDlBaslcMeas1pI minimum guaranteed

Se t the above parameters through SET ULDM.


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Reporting Period (ConL)

ChoiceRprtUnitForHsdpaPwrMeasGBP TenMsecForHsdpaPwrMeas

MinForHsdpaPwrMeasCh oceR prtU nitForHsdpaR ateM eas

HS4JSCH PBR TenMs ecFo rHsd paPMdRaieM easMinForH dpaPrvidRateMeasChoiceRp rfUni tForHsup aRat eMe s

EDCH PBR TenMs ecForHsu paPridRateM easMinForHsupaPrvidRateMeas

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WCDMA Admiss ion Control Algorithm andParametersr

. Set the above parameters through SET ULDM.

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W CD M A Admission Control Algorithm andParameters

Contents1. Load Control Overview

1.1 Load Control Algorithms Overview1.2 Load Measurement1.3 Priorities Involved in Load Control


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WCDMAAdmission Contro l Algo rithm andParameters

Priority The QoS of the services or users with 10w priority wiil beaffected by the bad control algorithms first

Three kinds of priorities involved in bad control:/ User priority

. RAB integrated priorityUser integrated priority

User priority: mafnly applying to provide different QoS for different users. Eg., settingdifferent GBR according to the user priority for BE service. No consideration about theservice. RAB in tegrated priority: priority of a service, related to the service type, and the user

priority of the user . User integrated priority: only used for mubti-RAB user, it is a temporary priority of an

ongoing-service user.


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WCDMA Admission Control Aigorithm andParameters

liser prorty God Slver CopperUpiink 384kbps 128kbps 64kbps

Downlink 384kbps 128kbps 64kbps

in CN HLR, operator can set ARP (Allocation Retention Priority). During servicesetup, CN sends AR P to RNC. Based on the mapping relation (configured in RNC),RN C can identify the users priority, nameiy gold, silver or copper one.

El V allocaton rRetentonProrlyprorlyLevel flxc (1 2)pre ernptonCpablty ghali-not trgger pre-empton (0)pre emptonvulnerablty not-pre emptable (0)queungAilowed queueng allowed (1)

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User Priority* There are three leveis of user priority:

gold (high priority), silver (middle priority) and copper (10wpriority) users -

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WCDMA Adm ission Control Algorithm andParameters

1 2 3 4 5 6 7 8IJS . GoId GoId GoId Gaid GoId Silver Siiver SilverFrorty.ARP 9 10 11 12 13 14 15User Si!ver Silver Copper Copper Copper Copper CopperProrty

User pr iorities are adopteci ta provide differentiated services for users. Fo r ease ofappiication, the RNC naps the 15 levei s of Allocation/Retention Priority (ARP) tha t iscarried in the RAB ASSGNMENT REQUEST message fro rn the core network

(CN )onto three user prioritles, that is, gold (high priority), silver (mediurn priority) , andcoppe r (10w priority). The relation between user priority and ARP can be set throughSET UUSERPRIORITY cornmand.

IfARP is not received in messages from the lu interface, the user priority is regardedas copper. J E O

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User Priority (ConL) The mapping relation between user pr iority and ARP isconfigured in RNC by SET UUSERPRIORITY

Typical relation between user priority and ARP:

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The values of RAB integrated priority are set according to the integrated priority configuration [eference parameter (Pr!or!tyReference):Q If PriorityReference i set to ARP, the integrated priority abides by the following rules: r

ARP: ARP > ARP2 > ARP3> > ARPI4 >ARP5 Services of the same ARP: priority based on t raf fi c ciasses, that is,

conversational > streaming> interactive > background OnIy for the interactive service of the same ARP value: priority based on Traffc

Handiing Priority (THP), that is, THPI > THP2 > THP3> > THPI4 > THPI5 Services of the same ARP, traffic class and THP (oniy for interactive services):

HSPA or DCH service preferred depending on CarrierTypePriorlnd.If PriorityReference is setto Traffic Class, the integrated priority abides by thefollowing rules:

Traffic ciasses: conversational > streaming> interactive > background Services of the same traffic class: priority based on ARP, that is, ARPI >

ARP2 > ARP3> > ARP4 > ARP5 Oniy for the interactive service of the same ARP: priority based on Traffc

Handling Priority (THP) that is carried in the RAB ASSIGNMENT REQUESTmessage, that is, THPI > THP2 > THP3> > THP4> THP5Services of the same traffic class, ARP and THP (only for interactive services):High Speed PacketAccess (HSPA) or Dedicated Channel (DCH) servicepreferred depending on CarrierTypePriorlnd.


WCDMA Admission Control Algorithm and

ARP

RAB Integrated Priority RAB integrated priority is mainiy used in bad control

algorithms

RAB integrated priority are set according to

Traffic Handiing Priorfty (THP, oniy for interactive services)Carrier types: HSPA or DCH

Traffic Class

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Services attribu tion in the ceM

A 1 Interactive DCHB 1 Interactive HSDPAC 2 Conversational DCHD 2 Background DCI -1

Based on ARP, HSPA priority is higherF r I?

B 1 Interaciive HSDPAA 1 Interactive DCHC 2 Conversational DCHD 2 Background DCH

1ased on Traftic Cla ss, HSPApriority is hig her

C Conversational 2 DCH0 Interactive 1 HSDPAA Intoractive t DCHD Backgrcund 2 DCH

Thi s ex ample sh ows the RAB integrated priority calculation in 2 different con ditions.e- pq,-d

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WCD MA Admission Control Algorithm andParameters

An Example for RAB Integrated Priority


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t..WCDMA Admission Control Algorithm andParameters

User Integrated Priority le- Bjer, the user integrated priority is the sameas the RAB integrated priorfty

For multiple-RAB user, the user integrated priority is basedon the highest priority of RAB


A user may have muftiple RABs, and the RABs may have different prioritles. in thiscase, the highest priority is taken as the priority of this user. Such a priority is calleduser integrated priority. User integrated priority is used in user-specific bad cortrol.For example, the selection of R99 users during preemption, the selection of usersduring inter-frequency bad handover for LDR, and the sebection of users duringswitching of BE services to common channebs are performed according to the userintegrated priority.

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WCDMA Admission Control Algori thm andParameters

Parameters of Pri rity PriorityReference

D Parameter name: lntegrate Priority Configured ReferenceRe ommended value: ARP

CarrierTypePriorlnclParameter name: Indicator of Carrier Type PriorityRecommended vaue; NONE

PriorityReferenceo Content: Reference used to determ ine which priority is arranged first in thepriority sequence. If the ARP is preferabiy used, the priority sequence is gold>

silver> copp er. if the ARPs are alI the same, the TrafficCiass is used and thepriority sequence is conversational > streaming> interactive> background.If the TrafficClass is preferabiy used , the priority sequence is conversationai>streaming> interactive > background. If the TrafficClass factors are ali thesame, the ARP factor is used and the priority sequence is gold > silver>copper.Va lue range : ARP, TrafficClassPhysica( va lue range: ARP, TrafficCiass

CarrierTypePrior!ndConten t: Decide which carrie r is prior when ARP and TrafficCiass are bothidentical.

o Value range : NONE, DCH, HSPAPhysical value range: NONE, DCH, HSPA

Set these parameters through SET UUSERPRIORITY.



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WCDMA Admission Control Aigorithm andParameters

Contents

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1. Load Control Overvew2. CAC Algorithm and Parameters3. IAC Algorithm and Parameters

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WCDMA Admission Cont rol Algori thm andParameters

Contents2. CAC (Cali Admissibn Control)

2.1 CAC Overview2,2 CAC Based on Code Resource2.3 CAC Based on Power Resouroe2.4 CAC Based on NodeB Credit Resource25 CAC Based on Iub Resource.6 CAC Based on the Numbe r of HSPA Users

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Why We Need CAC? WCDMA is an interference limited system, after a newservice is admitted, the system bad wiil be increased

If a celi is high Ioaded, a new service wili affect the QoS ofongoing user, even result in cail drop

CAC is used to determine whether the system resourcesare sufficient to accept a new users access request or not

CAC is needed under such scenarios:RRC connection setup request

D RAB admission decisiono Handovero Rate reconfigurationf> JC Q1


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The admission decision is based on:Av ailable ceW code resourceAv ailable ceil power resourceNodeB credits, which are used to measure the channel demodulationcapab il ity o f NodeBsAvai lable Iub transmission bandwidthNumber of HSDPA users (onty for HSDPA services)

o Number of HSUPA users (oniy for HSUPA services) A cail can be admitted oniy when ali of these resources are available.


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WCDMA Admission Control Algorithm andarameters

HSPA Admission C ntrolHSPA adrnission control enables the HSDPA service alongwith other R99 services to acces the network

HSDPA acimission control based on:The number of HSDPA users

Iubreso rceHSUPA admission control basedon:

The number of HSUPA usersIubresource

NodeB redit resources

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HSDPA admission control is described in this document, along with R99 admissioncontrol.

Code resource-based admission is mandatory when a non-HSDPA service attemptsto access the network.



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WCDMA Admission Contro t ATgorithm andPararneters

CAC Aigorithm Switches Power CAC

Uplink CAC agorithm sw itch: ALGORITHMSECONDDownlirk CAC algorithm sw itch: ALGOR ITHM_F IRST

NodeB credit CACCAC algori thrn switch: ONCeil CAC algori thm swi tch-CRD_A DCTR L: ON

e HSDPA user number CAGo Celi CAC algor ithm switch-HS DPA _UU _AD CTRL: 0FF

HSUPA user number CACCe il CAC algor ithm switch-HSUPAUU_ADCTRL: 0FF

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Code and lub resource-based admission control are ma nda tory and can not be disab led. Otheradmission con trol strategies may be enabled/disabled through the RNC command:

The sw itch of power CAC can be set by ADD UCELLALGOSWTCH/ MODUCELLALGOSWITCH:

Uplink CAC algor ithrn switch (NBMU!CacA!goSeSwitch) selects the a(g orithm usedfor power admission in the upink.Downl lnk CAC afgori thm sw itch (NBMD!CacA!goSe!Sw!tch) seects the algorithmused for power admission in the downlink.

The swit ch of NodeB credit CAC can be set by SET UCACALGOSW ITCH andQUCELLALGO SW ITCH/ MOD UCELLALGOSWITCI-1:

CAC algorithm switch (CacSwitct) specifies whether to enabe or disable the NodeBtevel credit CAC algor ithm.Ceil CAC algorith m sw itch (CRD_ADCTRL) specifles whether to enable er disable theceti eve t credit CAC algorithm.

The sw itch of HSDPA user number CAC can be set by ADD UCELLALGOSWITCH/ MODUCELLALGOSW ITCH:

o Ceit CAC algo rithm switch (H SD PA_ UU_A DCTR L) specifies whether to enable ordisabte the HSDPA user number admission contr ot atgo rit hm .

e The switch of HSUPA user number CAC can be set by ADD UCELLALGOSWITCH / MODUCELLALGOSWITCH:

o Ceit CAC atgo rithm swit ch (HS UPA _UU _AD CTRL ) specifies whether to enabte ercii sable the HSUPA user number admission con trol atg or ithm.

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WCDMA Admission Controi Algorithm andParameters

J Contents2. CAC (Ca li Acimission Control)

2.1 CAC Overview2.2 CAC Based on Code Resource2.3 CAC Based on Power Resource2.4 CAC Based on NodeB r ed it Resource1.5 CAC Based on ub Resource2,6 CAC Based on the Nurnber of HSPA Users

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LiWCDMA Admisson Con trol Algort hm and


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Parameters

CAC Based on Code Resourcen Code resource CAC is involved in:RRC connection setup

HandoverR99 services setup

RRC connection setup and handover have higher priority

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e Code resource-based admssion is mandatory when a non-HSDPA service attemptsto access the network. For HSDPA services, the reserved codes are shared by ali HSDPA services.Therefore, the code resource-based admission is not required. 1 Lg).,.4 (. ,

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WCDMA Admssion Control Algorithrr andParameters

Code CAC for RRC Connection Setup If the RRCCoCodeCacChoice parameter is set to

LOOSE_CAC: cCode resource-based admission succeeds if the remainingcode resources are sufficient for setting up an RRCconnection.

If the RRCCeCocfeCacChoice parameter is set toSTRICTCAC: kd

The RNC imptements code resource-based admission basedon the cause carried in the RRC connection setup request.

If the cause i Emergency Cail or Detach , code resource-based admissionsucceeds if the remaining code resources are sufficient.

For any other cause, the RNC must ensure that the remaining codes (the remainingminimum SF of the current celi) do no t exceed the reserved minimum spreadirg factor(SF) for an RRC connection upon admitting an RRC connection setup request. Thereserved minirnum SF is specifled by the DlRRCCeCodeResvSfparameter., , 5 i, U E


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Parameters

Code CAC for Handover For handover service requests, code. resource-based

admission succeeds if the remaining code resources aresufficient for the service to be admitted.

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WCDMA Admission Control Aigorfthm and


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Parameters

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Code CAC for P8 /08 Service(Non-AMR Service)For PS serviceslCS service (non-AMR service) requests: The RNC must ensure that the remaining codes


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Parameters

Code CAC for AMR Service For AMR service requests

o If the CSRABCacOptSwitch parameter is set ta 0FF The RNC mu st ensure that the remaining codes (the rem aining

minimum SF of th e curr en t ceil) upon admitting a ne w servi ce danot exce ed th e threshold specified by the DlHoCeCodeResvSfpara me ter.

o tf the CSRABCacOptSwitch parameter is set ta ON, Co de resourcebased ad mi ssion succeeds if the rem aining co de

resources ara suff icien t for the serv ice to be adm itted


T WCDMA Admission Control Algorithm and


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Parameters [Parameter of CAC Based on CodeResource [ RRCCeCodeCacChoice

D Parameter name: Credit and Code CAC Choice for RRCRecommended value: LOOSE_CAC t- CSRABCacOptSwitchParameter name: CS RAB Setup Resource Allocation SwitchRecommended value: 0FF

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RRCCeCodeCacChoiceD Content: RRC connection admission control (CAC) mode. When this

parameter is set to LOOSE_CAC, the original RRC admission thresholdremains unchanged. When this parameter is set to STRICT_CAC, the RRCadmission threshold equals the RAB admission threshold plus the RRCadmission threshold offset for the corresponding service. [

D Value range: LOOSE_CAC, STRICT_CAC CSRABCacOptSwitch

Content: Whether resource allocation is optimized during CS RAB setups.When this parameter is set to ON, the RNC allocates power resources, coderesources, channel element (CE) resources during CS RAB setups based onthe loose CAC algorithm. This setting increases the CS service setup successrate. When this parameter is set to 0FF, the RNC does no t allocate resources flduring CS RAB setups based on the loose CAC algorithm.Value range: 0FF, ON

Set this parameter through ADD UCELLALGOSWITCHMOD UCELLALGOSWITCH

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WCDMA Admission Control Agorithm andarameters


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Parameter of CAC Based on CodeResource (ConL)D!HoCeCodeResvSf

Parameter name: DL handover credit and code reserved SFRecommended value: SF32

Content: Some cefl resources can be reserved for handover UEs to guaranteehandover success rate and improve access priorfty of handover services. Thisparameter defines the quantity of downlink code and CE resources reservedfor handover. SFOFF refe rs to that no resources is reserved. SF32 refers tothat a code resource with SF 32 and its cor responding credit resource arereserved. Th e backer position the value is in {SF4, SF8, SF16, SF32 , SF64,SF128, SF256, SFOFF}, the Iess code and credi t resources reserved forhandover UEs. The possibility of rejecting handover UE admissions increasesand performance of UEs cannot be guaranteed. The more frontal position thevaue is, the more the possibiity of rejecting new UEs is and some idleresources are wasted.Value range: SF4 , SF8, SF16, SF32, SF64, SF128, SF256, SFOFFPhysical value range: SF4, SF8, SF16, SF32, SF64, SF128 , SF256, SFOFFSet this parameter through ADD UCELLCACI MOD UCEL LCA C.


D!HoCeCodeResvSf

WCDMA Admfssion Control Algorithm and


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Parameters

Content2. CAC (Cail Admission Control)

2.1 CAC Overview22 CAC Based on Code Resource2.3 CAC Based. on Power Resource2.4 CAC Based on NodeB Credt Resource15 CAC Basedon Iub Resource2.6 CAC Based on the Number of HSPA Users

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The power CAC involves uplink admission control and downink adrnission controLThe corresponding adrnission control switches NB MU!CacAlgo SelSwitch orNBM DICacA!goSe Sw itch are independent of each other.

To enable power-based admission control for HSDPA or HSUPA services, selectHSDPA_UU_ADCTRL or HSUPA_UUADCTRL under the NBMCacAIgoSwitchparameter. .fw

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CAC Based on Power Resource Power resource CAC is invoived in:

RRC connec tion setupHandoverServices setup

RRC connection setup and handover have higher priority

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ClI L E GBFP1JI spJ

E PBR > ThCGE( Y GBR;(GBp is the maxinum guaranteed bad threshod for HSUPA services when Lthe RN C makes an admission decision on an R99 service. it is set by theHsupaMaxGBPThd parameter.

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WCDMA Admission Control Algorithm andParam eters

Uplink ENU Resource AdmissionDecisions

ceil is in the OLC state triggered by the RTWP:


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If ao fluL,ENU S Ce lUEq uN umCapacity

If a ceil is not in the OLC stateIf the bearertype is the DCH RAB

>.: UL,ENU + 0UL,ENU THdOt flULRPreferENU + UCJITOfIThd

o If the bearer type is the HSUPA RABflULENU + LflULENU THd

such 8$: LJlNonCtrIThdForAMR, UINonCtriThdForNonAMR,

UlNonCfrlT hdForOther or UlNonCtrlThdForHo

flULENU is the sum of the uplink tota l ENU bad. flULENU is the ENU bad increase caused by the new service.9LR99Prefer-ENU 15 the sum of the to ta l uplink ENU bad for preferential admission of

R99 services. For DC-HSUPA RABsDC -HSUPA RABs are admitted onby to the prim ary carrier . Admission contro lfor DC-HSU PA RABs is the sam e as that for common HSUPA RABs.The ENU co rre spon ding ta the DC-HSUPA RABs is counted into the ENU badof the primary carrier.


WCDMAAdmission ControlAlgorithm andParameters

Downlink ENU Resource AdmissionDecisions


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in the downlink, ENU-based admission decisions are madebased on the foilowing bad measurements:

Downbnk total ENU badflDL.ENU = ENUDLTo/ENUDLMax + DLCCH

The total downlink bad for preferential admission of R 99services

flDLRfl9Prefe-ENU = DLDCH EN(J + ThdHSDPAM8P

ENUDLTOt is the sum of ENUs corresponding to the RABs in a ceil. ENUDLMaX la the maximum ENU of a cebi. it is set by the DlTotalEqUserNum

parameter. flDLCCH is the reserved bad on the downHnk common channels. it is set by theDlCCHLoadRsvCoeffparameter. flDLDCH_ENU is the ENU bad of ali DCH RABs in a ceil. it is the ratlo of the su m o fENUs for ali DCH RABs to the maximum ENU in a celi (DlTotaEqUserNum). ThdHSDPAMaXGBP is the maximum guaranteed bad threshold for HSDPA services wher

the RNC makes an admission decision on an R99 service. it is set by theHsdpaMaxGBPThd parameter.

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uWCDMA Admi sson Control Algorithm andParameters

Downlink ENU Resource AdmissionDecisions

For non-DC-HSDPA RABs


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If the bearer type s the DCH RABI]DLENU + flOLENU THdOr flDLRS9Prefe


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UlTotalEqUserNumParameter name: UL total equivalent user numberRecommended value: 95

DlTotalEqUserNumParameter name: DL total equivaent user numberRecommended value: 80

t:t:12ContentWhen the algorithm 2 is used, this parameter defines the total

equivalent user numbers corresponding to the 100% uplink bad. Theparameter shoud be related to the admission threshold and actual condition ofthe network.Value range: 1-200 IJPhysical value r ange :1 200 ; step: 1

DlTotalEqUserNumo Content: When the algorithm 2 is used, this parameter defines the totalequivalent user number corresponding to the 100% downlink bad. Theparameter should be refated to the admission threshold and actual condition ofthe network.

o Value range: 1 200Physicab value range:1-200; step: 1

Set these parameters through ADD UCELLCAC/ MOD UCELLCAC.

t,t:

UlTotalEqUserNum

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Power-Based Admission Algorithm 3for RAB Setup Agorithm 3 is similar to algorithm 1.


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The only difference i that the estimated bad increase inalgorithm 3 is always set to 0.

Based on the current celi bad, the RNC determines whetherthe ce il bad exceeds the threshold

If the celi bad exceeds the thresho ld, the RNC rejects theaccess request.If not, the RNC admits the service.

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WCDMA Admission Control Algonthn andParameters

Uplink Power-Based AdmissionAlgorithm 4 for RAB SetupAlgorithm 4 makes admission decisions based on the total


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uplink bad flUL,Actua-Tota as the following formula:flUL,Actuai-Toti = flUL,Actual + ]ULCCH

RNC makes the admission decisionflUL,ctuai-roa + flUL THd

such as: UINonCIrIThdForAMR, UlNonCtlThdForNonAMR,U(NonCtrlThdForOther or UlNonCtriThdForHo

CopynhtC 2012 Huawe Technooges Co,, LtdfiJI nghts rerve. Pageil HUAW I

flULACtUa is the actuai upHnk service bad. flULCCH is the reserved bad on the upbink common channels. it is set by the

UlCCHLoadFactor parameter.

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WCDMA Adrnission Control Algorithm andParameters

UpIink Power-Based AdmissionAlgorithm 4 for RAB Setupin DC-HSUPA celis


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For DC-HSUPA non-scheduling services, admission decisionsbased on the total uplink bad are made oniy on the prim arycarrier.For DC-HSUPA scheduling service is adm itted ifadmissiondecision based on the total uplink bad is successful on theprim ary or secondary carrier.

For DC-HSUPA celis, the uplink bad introduced by the DC-HSUPA UE is calcubatedand then apportioned on the primary an d secondary carriers based on the UE rateratio per carrier. The RNC decides whether to admit a DC-HSUPA UE based on thetotal upbink bad and uplink bad increm ent introduced by the DC-HSUPA UE on theprimary carrier and secondary carriers. The admission decision method is the samewith that of SC-HSUPA.



Contents2. CA C (Cali Admission Control)


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2. 1 CAC Overvew2.2 CAC Based on Code Resource2.3 CAC Based on Power Resource2.4 CAC Based on NodeB Credit Resource2.5 CAC Basod on ub Reource2.6 CAC Based on the Number of HSPA Usora

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WCDMA Admission Control Algorfthrn andParameters

NodeB Credit The NodeB credit resource is a concept on the RNC side. it is


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referred ta as the channel etement (CE) on the Node8 side. CEs are used to measure the channel demodulation capability

of NodeBs.CEs are ciassife d into uplink and downlink CEs.

One uplink CE needs to be consumed by an uplink 122 kbitfs volceservic e (SF = 64) plus 3.4 kbits signaling traflic.One downlink CE needs to be consumed by a downlink 12.2 kbit/svoice service (SF = 128) plus 3.4 kbitfs signaling traffic.

:iCapyrht 2012 Huawe Technologes Co LHd AH nhts res erve d PaeB0 HUAWEI

If only 3.4 kbit/s signaling traffic is carried on a DCH or HSPA channel, one CE is stilineeded. CEs have been reserved for common and HSDPA-related channels.

NodeB credit resource-based admission is implemented at NodeB level, local cegroup


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1-Qc4(E


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STRICTCAC,admission based on the cause carried in the RRC connectionsetup request:

If the cause is Emergency Cair or Detach admission succeeds if the avallable credit resou rces are suf ticient.For any other cause

the RNC must ensure that the available credit resources of the localceli, local ceil group (if any), and NodeB excee d the rese rved credi tres ources upon admitting an RRC connection setup requ est.

The reserved credit resources are calculated using SF which is specifled by theparameter DlRRCCeCodeResvSf (for the downlink) or UIRRCCeResvSf (for theupllnk).

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WCDMAAdmssion Control Algorithm andParametersNodeB Credit Resource-basedAdmission Decisions (Cont.)

Handover Service Requests


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admission succeeds if the available credit resources of thetocal ceil, local ceit group (if any), and NodeB are sufficient forthe service to be admitted

P8 SericeICS Service (Non-AMR Service) Requeststhe RNC must ensure that the avallabte credit resources of thetocal ceil, tocat ceit group (if any), and NodeB exceed thereserved credit resources upon admitting a new service.

Copygght 2012 Huawei Techaooges Co Ltd AJI rhts rezerveci Pg3 HUAWEI

The reserved credit resources are caiculated using SF which is specified by theUIHoCeResvSf (for the uplink) or DlHoCeCodeResvSf (for the downtink) parameter.

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The reserved credit is calculated through SF which is determined by theUIHoCeResvSf (for the uplink) or DlHoCeCodeResvSf (for the downiink) parameter.

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admis ion success if the current avaiable credit resources of theoca l celi, local celi group (if any) and Node8 are suf fieient for theservice.

If the CSRABCacOptSwitch parameter is setto 0FF,the RNC has to ensure that the current ava Ha ble cred it of the localceil, ocal ceil group (if any) and NodeB exceeds the reservedcred it after adnitting a new service.

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Parameter of NodeB Credit CAC L RRCCeCodeCacChoice

arameter name: Credit


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[and Code CAC Choice for RRCRecommended value: LOOSE_CAC [ DIRRCCeCodeResvSfParameter name: DL Credit and Code Reserved SF for RRCRecommended value: SF128

URRCCeResvSf

[Content: RRC connection admission control (CAC) mode. When this parameter isset to LOOSE_CAC, the original RRC admission threshold remains unchanged.When this parameter is set to STRICT_CAC, the RRC admission threshold equalsthe RAB admission threshold plus the RRC admission threshold offset for thecorresponding service.Value range:LOOSE_CAC, STRCT_CAC

Set this parameter through ADD UCELLALGOSWITCH! MOD UCELLALGOSWITCH D!RRCCeCodeResvSf

o Content: Threshold for RRC admission based on DL credit and code resources. the value SFOFF indicates that credit resources are no t reserved for handover. Ifthe remaining DL resources in a celi are Iower than this threshold after a newservice is set up , the new service is rejected.o Value range:SF4(SF4), SF8(SF8), SF1 6(SF 6), SF32(SF32), SF64(SF64),SF1 28(SF 28), SF256(SF256), SFOFF(SFOFF)

Physical value range:SF4, SF8, SF16 , SF32, SF64, SF128, SF256, SFOFF UIRRCCeResvSf

Content: Threshold for RRC admission based on UL credit resources. Th e valueSFOFF indicates that credit resources are no t reserved for handover. If theremaining UL resources in a celi are Iower than this threshold after a new serviceis set up , the new service is rejected.Value range:SF4(SF4), SF8(SF8), SF1 6(SFI6), SF32(SF32), SF64(SF64),SF1 28(SF128), SF256(SF256), SFOFF(SFOFF)

o Physical value range:SF4, SF8, SF16, SF32, SF64, SF128, SF256, SFOFF Set this parameter through Set this parameter through ADD UCELLCACI MODUCELLCAC.

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Parameter name: UL Credit Reserved SF for RRCo Recommended value: SF64

RRCCeCodeCacChoice

Permission

WCDMA Admission Control Agorithm andParameters

Pararneter f NodeBCredit CAC(Cont) UIH Cesv$f

Parameter name: UL handover credit reserved SF


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o Recomrnended value: SF16e DlHoCeCodeResvSf

Parameter name: DL handover credit and code reserved SFo Recommended value: SF32

Csfl4BCacOptSvdtcho Parameter name: CS RAB Setup ResourceAllocation Switch

Content: Uplink Credit Reserved by Spread Factor for HandOver. SFOFFmeans that none of thern are reserved for handover.Value range: SF4, SF8, SF16, SF32, SF64, SF128, SF256, SFOFFPhysica l value range: SF4, SF8, SF16, SF32, SF64, SF128, SF256, SFOFF

DlHoCeCodeflesvSfContent: Some ceil resources can be reserved for handover UEs to guaranteehandover success rate and improve access priority of handover services. Thisparameter defines the quan tity of downllnk code and CE resources reservedfor handover. SFOFF refers ta that na resources is reserved. SF32 refers tathat a code resource with SF = 32 and its corresponding credit resource arereserved..Value range: SF4, SF8 SF16, SF32, SF64 , SF128, SF256, SFOFFPhysical value range: SF4 , SF8, SF16, SF32, SF64, SF128, SF256, SFOFFSet th is parameterthrough ADD UCELLCAC! MOD UCELLCAC.

CSRABCacOptSw itcho Con tent: Whether resource alloc ation is opt imized during CS RAB s

etups.When this parameter is set to ON, the RNC allocates power resources, coderesources, channel element (CE) resources during CS RAB setups based onthe loose CAC algorithm. This setting increases the CS service setup successrate. When this parameter is set ta 0FF, the RNC does not allocate resourcesduring CS RAB setups based on the loose CAC algorithm.Value range: 0FF, ON

Set this parameter through ADD UCELLALGOSWITCH / MOD UCELLALGOSWITCH

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Recommended Value: 0FF

U!HoCeResvSf

Permission


Cortents2. CAC (Cali Admission Control)

2.1 CAC Overview

E


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2.2 CAC Baseci on Code Resource2.3 CAC Based on Power Resource2.4 CAC Based on NodeB Credit Resource2.5CAC Based on ub esource2.6 CAC Based on e Number of HSPA Users



tub Resource CAC iub overbooking

The iub overbooking feature considers the statis tic rnultiplexing


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of service activities and multiple usersL1

Through the admission of more users, lub overbookinginoreases the resource utiHzation on the tub interface

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The Universal Mobile Telecommurications System (UMTS) supports four traff ic ciasses:conversational, strearn ing, inte ractive , and background. The transrnission rate varies withthe tra ftic class as follows:

For Circuit Switched (CS) conversational services, the channel transmits voicesignals ata certain rate (for example, 12.2 kbitls) during a

conversation and oniytransmits Silence Descriptors (SIDs) at intervais wh en there is no conversation.For Packet Swi tch ed (P5) interactive and background services, such as we bbrowsing, there is data transmitted during data dow nloading . After a web pagehas been downloaded, and when the user is reading the page, however, there isvery litUe data to transfer.

If the Radio Network Controller (RNC) allocates the maximum bandw idth to thesubscriberwhen a service is estabiished, a large proportion of the Iub transmissionbandwidth is unused. For example, downloading a 50 KB page takes oniy about onesecond, bu t reading this page needs dozens of seconds. Thus , over 90% of the lubtransmission bandwidth is not used.

To save the lub transmission bandw idth for operator use, Huawei provides the luboverbooking function, which applies an admission control mechanisrn to access theservice. Services are admitted according to the diff erent activity factors. PS interactiveand background services can be admitted according to the Guaranteed Bit Rate (GBR).In this way, the maximum number of users with the minimum number of activity requestto use volce and PS Best Effort (BE) services can access the network, thus achieving abetter utitization of transmission bandwidth.


WCDMAAdmission Control Algorithm andParameters zEEIub Resource CAC (Cont.)

Act ivityfactorRT services, including conversationa and streaming services,


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[[EEt:[T

For BE services, the GBR can be set by running the SET UUSERGBR command. Activity factors can be configured for different types of service by running the

TRMFACTOR/ MOD TRMFACTOR command. Default settings of activity factors for typical types of service:

AMR voice 70/70 (DUUL)R99 CS streaming 100/100 (DL/UL)R99 PS conversationa 70170 (DL/UL)R99 PS streaming 100/1 00 (DUUL)R99 PS interactive 40/40 (DL/UL)R99 PS background 40140(DLIUL)HSPASRB 15/15 (DL/UL)HSPAvoice 70/70 (DL/UL)HSPA conversational 70/70 (DL/UL)HSPA streaming 100/1 00 (DL/UL)HSPA interactive 40/40 (DLIUL)HSPA background 40/40 (DLIUL)

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are admitted at the Maximum Bit Rate (MBR):Admission bandwidth = MBR x activity factor

NRT services, including interactive and background services,are admitted at the GBR:

Admissior bandwidth = GBR x activity factor

SRB 15/15 (DL/UL)

nLiWCDMA Admission Control Algorithm andarmeters

Iub Resource CAC Procedure For handover of a user, the fo iiowing requrements appty:

u Load of the path + Bandwidth required by the user


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The parameters of threshold should satisfy with: Bandwidth reserved for handoverCongestion threshold Congestion resoiv ing threshold.

The congestion threshold and the congestion resolv ing threshold are used to preventthe ping-pong effec t.

Based on the preceding requirement, the user prioriti es are as follows:User requesting handover> New user> User requesting rate upsizing

The congestion thresholds are EWDCONGBW and BWDCONGBW, and thecongestion resolving thresholds are EWDCONGCLRB W and BWDCONGCLRBW.

The parameters that are used to reserve bandwid th for handover are as foliows:FWDHORSVBW

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For a new user, the following requirements app!y:Load of the pa th + Bandwidth required by the user


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Recommended vaue: 0, harneiy OKbitls *FWDc.ONGL W/BWDCONG8W

Parameter name: Forward/Backward congestion threshofd rD ecommended value: 0, nameiy OKbit/sFWDCONGCLRBW/WDCONGCLRBW

Parameter name: Forward/Backward congestion clear thresholdD Recommended value: 0, nameiy OKbitls p

1* FWDRSVHOBWBWDRSVHOBW [Content: Reserved forward/backward bandwidth for handover user.

D Value range: 0-200000D Physical value range:0 200000; step: 1D Physical unit: KbitIs

FWDCONGBWIBWDCONGBWo Content: If the available forward/backward bandwidth is Iess than or equal to

this value, the forward/backward congestion alarm is emitted.Value range: 0-200000

o Physical value range:0 200000; step: 1o Physical unit: Kbitls

FWDCONGCLRBW/BWDCONGCLRBWD Content: If the available forward/backward bandwidth is greater than this value,

the forward/backward congestion alarm is cleared.o Value range: 0-200000o Physical value range:0 200000; step: 1 1D Physical unit: Kbitls L

Set these parameters through ADD TRMLOADTH.


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