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WDMA RANİ4.Handover Algorithm and

Parameters

WCDMA HandoverAlgonthm and Parameters

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WCDMA Handover Algorithm and Parameters

Foreword

Why mobile system need handover?

The mobHity of UE

Load Balance

Anyothers?

• Handover is a basic function of the cellular mobile network. The purpose ofhandover is to ensure that a UE in CELL_DCH state 15 served continuouslywhen it moves.

• With the development of WCDMA network, more and more users join in thesystem. Using Handover can achieve bad balance between carriers and fullyutilizes system resources.

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• Handover types supported by UMTS:


References

• 3GPP TS 23.122: Non Access Stratum functions related to Mobile

Station (MS) in idle mode

• 3GPP TS 24.008: Mobile radio interface layer 3 specification; Core

Network Protocols - Stage 3

• 3GPP TS 25.304: UE Procedures in Idle Mode and Procedures for Celi

Reselection in Connected Mode

• 3GPP TS 25.331: RRC Protocol Specification

• 3GPP TS 23.060: General Packet Radlo Service (GPRS); Service

description

• 3GPP TS 25.931: UTRAN Functions, Examples on Signalling

Procedures



Objectives

Upoa completion of this course, you wili be able to:

D Explain the features of each handover

Describe the procedures of each handover

Perform the parameters setting of each handover


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WCDMA HandoverAlgorithm and Parameters

The Basic Concepts of Handover

• Active set

• Monitored set

• Deteoted set

• Radio link (RL)

• Radio link set (RLS)

• Maximum ratio combination

• Selective combination

• Soft handover gam

• PCPICH

• Active set: A set of celis simultaneously involved in a specific communication

service between the UE and the UTRAN.

• Monitored set: A set of celis included in the CELL_INFO_LIST, but do not

belong to the active set.

• Detected set: A set of celis detected by the UE, and do not included in the

CELL_İNFQLIST.

• RL: Radio link between NodeB and UE.

• RLS: Ali radio links from the sarrıe NodeB consist of a radlo link set.

• Combination way: For soft handover, the uplink signals are combined in RNC.

The RNC wili seiect one best signal to process. We cali this selective

conıbination. For softer handover, the upiink signals are combined in the RAKE

receiver of NodeB. It 15 maximum ratio combination.

• Soft handover gam: Please refer to the WCDMA Coverage Planning course.

• PCPICH: Primary Common Pilot Channel. UE measures the signai strength ofPCPICH for handover decision.

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Contents

1. Intra-Frequency Handover

1. Irıtra-Frequency Handover Overview

2. Intra.-Frequency Handover Measursment

3. bıtra-Frequency Handover Decisioh and Executon

4. Sgnaİing Procedures for fnfraFrequency Handover

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WCDMA Handover Algoritiim and Parameters

Intra-Frequency Handover Types

e The öarrier frequencies of the current ceil and target ceil are the

same:

Intra-frequency sof hanciover

Intra-frequency hard handover(CPICH cJNo)

Celil

(CPICH Ecfl4o)Ce112

ntra.rrequercy tard haadover

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• lntra-frequency handover is of the following two types:

ntra-frequency soft handover: means that multiple radio Iinks areconnected to the UE at the same time.

o Intra-frequency hard handover: means that oniy one radio link isconneoted to the UE at the same time.



Intra-Frequency Handover Types(ConL)

Comparison between soft handover and hard handover:

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The number of RLs in

active set cluring Several One

handover

Interruption duringNo Yes

handover

Oniy happened Can be happened in Intra

The frequencies of celis between intra- frequency celis or Inter

frequency ceNs frequency cells

• The maximum number of RL in the active set is 3 by default. And Thisparameter can be changed in the RNC. But this furiction need the UE to support.

Normaliy, the active set supported by UE is fixed 3 and can not be changed.


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WCDMA HandoverAlgorfthm and Parameters

Intra-Frequency Soft Handover

The types of intra-frequency soft handover are as follows:

Intra-NodeB soft handover (aso known as softer handover)

Intra-RNC inter-NodeS soft handover

Inter-RNC soft handover

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[• İntra-frequency soft handover is characterized by the function that the UE can

be connected to multiple Universal Terrestrial Radlo Access Network (UTRAN)

access points at the same time. Addition and/or release of radio links arecontrolled by the ACTIVE SET UPDATE procedure.

• The HO_INTRA_FREQ_SOFT_HO_SWITCH parameter in the Ş]

UCORRMALGOSWITCH command is used to determine whether to enable

both soft handover and softer handover. When the switch is on, the celis on the

RNC can active the soft handover. When the RNC receives reports on theevents lA, 1 B, 1 C, or 1 D, associated addition, removal, and replacement of

handover ceil of the soft handover are initiated. By default, this switch is set to

ON. ee


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Intra-Frequency Soft Handover (conL)

Comparison between soft handover and softer handover:

When the UE is in the overlapped When the tiE is in the

coverage area of two neighboring overlapped coverage area of twoScenarıo

cells of e NodeB wıth cornbined neghbonng celis of dıfferent

RLs NodeBs

Upllnk signal Using maximum-ratio combination Using seleotion combination

DowrıBnk Using maximum-ratioUsng rnaımum-ratıo combination

sgnaI combınatıon

Resource use Occupying Iess Iub bandwidth Occupying more lub bandwidth

• During softer handover, the uplink signaling are combined in NodeB by

maximum ratio combination, but during soft handover they are combined in RNC

by selective combination.

• Compare ta ater one, the maximum ratio combination can get more gam. Sa the

performance of maximum ratio combination is better.

• Since safter hartdover is compteted in NodeB, it da not consume more transport

resource of Iub.

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WCDMA Hanciover Algorıthm and Parameters

Intra-Frequency Hard Handover

Iatra-frequency hard handover:

No kır interface Elur interface is congested

D Soft handover faiis

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• Compared with soft handover, intra-frequency hard handover uses fewerresources. The scenarios of intra-frequency hard handover are as follows: r

No lur interface is present between RNCs. in this scenario, intra- t

frequency hard handover instead of soft handover can be performedbetween two RNCs.

The lur interface is congested between RNCs. in this scenario, also intrafrequency hard handover instead of soft handover can be perforrnedbetween two RNCs. -

D The intra-frequency soft handover fails and intra-frequency hardhandover is aliowed. When intra-frequency soft handover faiis becauseof a congestion problem of the target celi, the RNC tries an intra- [frequency hard handover with a Iower service bit rate.

• The HO_INTRA_FREQ_HARD_HQSW!TCH parameter in the[UCORRMALGOSWITCH command is used to determine whether to enableintra-frequency hard handover. By default, this switch is set to ON.

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• The intra-frequency handover procedure is divded into three phases: handovermeasurement, handover decision, and handover execution.

• After the UE transits ta the CELL_DCH state in conneoted mode during a cali,the RNC sends a MEASUREMENT CONTROL message to instruct the UE tatake measurements and report the measurement event results. Upon thereception of an event report from the UE, the RNC makes a handover decisionand performs the corresponding handover.


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WCDMA Handover Algorfthm and Parameters

Contents

1. lntra-Frequency Handover

1. Intra-Frequency Handover Overview

2. Intra-Frequency Handover Measurement

1. Intra-Frequency Handover Measurement Quantities

2. ntr-Frequency 1-landover Measurement Evens

3. lntra-Frequency Handovor Neighboring Ceil Combnatıon

Atgorithm

3. İntra-Frequency Handover Decision and Execution

4. Signallng Procedures for Intra-Frequency Handover


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Intra-Frequency HandoverMeasurement (ConL)

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Intra-Frequency Handover1

Measurement Quantities [• Measurement model in the WCDMAsystem:

raınetcrs {ı) Paırnetes (1»

r• L3filteringformula:

F =(1—a)xF_1+axMp0,ft / ı’

Measurement model n the WCDMA system:

A: measurement value of the physical layer tB: measurement value obtained after layer-1 filtering. The value isweighted by the layer 3 filtering coefficient.

C: measurement value obtained after layer 3 filtering. This value is [controlled by the higher layer. Filtering coefficient C is applicable to eventreports and periodic reports.

C’: another measurement value. C’ and C are measured in the same way. tD: measurement report message of Uu.

Parameters (a) include the layer 3 filtering system and Parameters (b) *

include the measurement report configuration.

L3 filtering formula:

Fn: measurement value obtained after the nth filtering

Fn-1: measurement value obtained after the (n-1 )th filtering

Mn: measurementvalue of the nth physical layer

a = 1/2(k/2): k is determined by the parameterwhich is the layer 3 [filtering coefficient of intra-frequency handover measurement

When a is set to 1, k = 0 and layer 3 filtering is not performed.

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Parameters of Intra-FrequencyMeasurement• IntraFreqMeasQuantity

Parameter name: Intra-freq Measure Quantity

Recommended value: CPICH_EC/NO

• FilterCoef

• Parameter name: Intra-freq meas L3 fdter coeff

• Recommended value: D3, nameiy K=3

Content: This parameter specifles the intra-frequency measurement

quantity. it defines the reference measurement quantity for the UE to

report event lx.

Value range: CPICH_ECİNO, CPICH_RSCP

Physical value range: CPICH_EC!NO, CPICH_RSCP

• FifterCoef

Content: This parameter specifıes the intra-frequency measurement L3

filter coefficient. The larger the value of this parameter, the stronger the

smoothing effect and the higher the anti-fast-fading capability, but the

Iower the signal tracing capability and the greater the possibility of cali

drops. Ifthevalue of this parameteris too small, unnecessary soft

handover or the ping-pong handover may occur.

Value range: DO, DI, D2, D3, D4, D5, D6, D7, D8, D9, Dil, D13, D15,

D17, D19

Physical value range: 0, 1, 2, 3, 4, 5, 5,7, 8, 9, 11, 13, 15, 17, 19

Set these parameters through SET UINTRAFREOHO/ADD

UCELLINTRAFREQHO/MOD UCELLINTRAFREQHO.

• IntraFreqMeasQuantity



E3Contents

1. Intra.-Frequency Handover

1. Intra-Frequency Handovr Ovenıew [2. Intra-Frequency Handover Measurement

1 ntraFrequency Handover Measurement Quamıtes

2. Intra-Frequency Handover Measurement Events

3 lntraFequency Handover Nighhoring Ce Conıİ2ınaton JAlgorfthm

3. ntraFrequency Harıctover Decişon and Execution

4. Sgnahıg Procedurs for frıtra-Frequency Handover

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Intra-Frequency HandoverMeasurement Events

• A prlmary CPICH enters the reporting range. This indicates that the quality of e

lA ceil is dese to the quality of the best ceil in the active set A relatively highcombined gam can be achieved when the ceH is added to the active set.

Aprimary CPICH leaves the reporting range. This indicates that a ceII basaIB lower quality than the best ceil in the active set. The celi has to be deleted from

the active set.

Arıon-active prhıary CPICH becomes better than an active primaıy CPICH.

10This indicates that the quality of a ceil is better than the quality of the worst ceilin the active set. The RNC replaces a ceil in the active set with a celi in thernonitored set.

İD The best celi ehanges.

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Intra-Frequency HandoverMeasurement Events (ConL) r

lAevent

Event lAis triggered on the basis of the foIIowin frn{ua: E•jt

-

÷ CIO M1 +(MB — (R1 — H10 /2)ı=1 İT

Mr ClOçj— ( i)

• MN is the measurement value of the celi in the reporting range.

• CIONew is equal ta the sum of ClO and ClOOfiset, which adjusts the ceil

boundary in the handaver algorithms. Ta facilitate handover in neighboring ceil

configuration, the parameter is set as a positive value; otherwise, the parameter

is set as a negative vatue. 1’• W represents Weighted factor, which is deterrnined by the parameter Weight.

The total quality of the best ceil and the active set is specifıed by W.

• M1 is the measurement value of a ce in the active set.

• NA is the number of celis not forbidden to affect the reporting range in the active

set. The parameter CellsForbiddenlA indicates whether adding the celi ta the

active set affects the reative threshold of event lA.

• MBest is the measurement value of the best celi in the active set.

• Ria is the reporting range or the relative threshold of soft handover. The -.

threshold parameters of the CS non-VP service, VP service, and PS service are

as follows:

IntraReJThdForlACSVP

IntraReIThdForlACSNVP

IntraRelThdForlAPS

• Hia represents HystforlA, the hysteresis vakie of event lA. LE


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Intra-Frequency HandoverMeasurement Events (Cont.)

CPCH EcINo

A 1me trjer

• The above figure shows the triggering of event lA. in this procedure, the default

parametervaiues are used.

• If the signal quality of a ceil that is not in the active set is higher than ThİA for a

period of time specified by TrigTimelA (that is, Time to trigger in the figure), the

UE reports event lA.

• ThIA = (CPICH Ec/No of the best ceil in the active set) - (repcrting range for

event lA)

• If Weightedfactor> 0, then ThİA = (general signal quality of ali the celis in the

active set) - (reporting range for event lA).

• Reporting range for event lA is equal to the value of IntraReIThdForlACSVP,

İntraRe!ThdForIACSNVP, or !ntraRelThdForlAPS.

• k signal quality curve of the best ceil in the active set

• B: signal quality curve of a ceil in the monitored set

• C:curveofThlA

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Parameters of lntra-FrequencyHandover(ConL) [.cıo

Parameter name: Celi oriented Ceil tndividual Offset [Recommended value: 0, nameiy 0dB

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• C!OOffset LıParameter name: Neighboring celi oriented CIO

Recommended value: 0, namely 0dB

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Content: This parameter works with the Neighboring ceil orlented CİO. it [is used for intra- or inter-frequency handover decisions. The larger thesum, the higher the handover priority of the neighboring celi. The smailerthe sum, the lower the handover priority of the neighboring ceil. Usualiy it flis configured to 0. (J

D Vaiue range: -2O-20

o Physical value range: -10-10; step: 0.5

D Physicai unit: dB

Set this parameterthrough ADD UCELLSETUP/MOD UCELLSETUP.

• ClOOffset C -eiŞ..o>( Ltfl k-

D Content: This parameter defines the neighboring celi oriented celiindividual offset. The set value functions in combination of the ceiloriented CİO. Their sum is added to the measurement quantity beforethe UE evaluates whether an event has occurred. in handover aigorithms,this parameter is used for moving the border of a ceif.

Vaiue range: -20--20

D Physical value range: -20--20; step: 1

Physical unit: dB [Set this parameterthrough ADD UINTRAFREQNCELUMODUINTRAFREONCELL.

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Parameters of Intra-FrequencyHandover (Cont.)

IntraReIThdForlACSNVP

Parameter name: CS non VP service lA event reative THD

Recommended value: 6, nameiy 3dB

• IntraReIThdForlACSVP

Parameter name: VP service lA event relative THD

Recornmended value: 6, nameiy 3dB

• IntraReIThdForlAPS

Parameter name: PS service lA event relative threshold


Content: These parameters specify the CS non-VPNP and PS services

relative threshold of event lA. The hig her the threshold is, the more

easily the target ceil joins the active set, the harder the cail drops, the

larger the ratio of the UE involved in soft handover is, but the more the

use of forward resources is. The Iower the threshold is, the more difficult

the target ceil joins the active set. Thus the communication quaiity and

the smooth handover cannot be guaranteed.

Valuerange:0—29

Physica vaue range: 0—14.5; step: 0.5

Physical unit: dB

• Set these parameters through SET UINTRAFREQHO/ADD

UCELLINTRAFREQHO/MOD UCELLINTRAFREQHO.

• IntraReIThdForlACSNVPIIntraReIThdForlACSVPIIntraReIThdForlAPS


1.

VVCDMA Handover Algorithm and Parameters

tParameters of Intra-FrequencyHandover (ConL) t-

- j,_Jı’l-• 1-iystforlA -

Parameter name: lA hysteresis tRecommended value: 0, nameiy 0dB

• TrigTimelA -,,.-

t-Parameter name: lA event trigger delay time

Recommended value: D320, nameiy 320ms F• Weight —

Parameter name: Weighted factor [Recommended vaue: 0

> Cpyng C2 Hufedo(gş ÇoAtl ng e Pa2

HystforlA

Content: This parameter specifies the hysteresis vatue for event lA. The value ofthis parameter correlates with slow fading. The larger the value of this parameter,the less possibility of ping-pong effect or wrong decision. But the event might notbe triggered in time.

o Value range: 0—15

Physical value range: 0—7.5; step: 0.5

Physical unit: dB

• TrigTimelA

o Content: This parameter specifies the time detay ta trigger event lA. The valueof this parametercorrelateswith slow fading. The larger the value of thisparameter, the Iower the incorrect decision probability, but the slawer theresponse of the event ta rrıeasurement sig nal change.

Value range: DO, Db, D20, D40, D60, D80, D100, D120, D160, D200, D240,D320, D640, D1280, D2560, D5000

o Physical value range: 0, 10, 20, 40,60, 80, 100, 120, 160, 200, 240, 320, 640,1280, 2560, 5000

Physical unit: ms

• Weight

o Content: This parameter is used ta define the soft handover relative threshotdbased on the measured value of each celI in the active set. The greater theparametervalue, the higher the soft handover relative threshold. When this valueis set ta 0, the soft handover relative threshold is determined only by the best celiin the active set.

Value range: 0—20 [Physical vatue range: 0—2; step: 0.1

• Set these parameters through SET UINTRAFREQHO/ADDUCELLINTRAFREQHO/MOD UCELLI NTRAFREQHO.


______________________ __________ ___________

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Intra-Frequency HandoverMeasurement Events (Cont.)

lA event report mode:

Event trigger report

Event to periodical report

• The report mode of lA is event trigger report.

• Generaliy the event lA 15 reported oniy once. However, to avoid measurement

report Ioss, the event lA reporting can be turned to periodical reporting.

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Parameters of Intra-FrequencyHandover(ConL) [• ReportintervaiforlA

D Parameter name: lA event ta periodical rpt period [Recommended value: D4000, namely 4000ms

• PeriodMRReportNumforlA

Parameter name: lA event ta periodical rpt number

D Recommended value: D16

EE[D

Content: This parameter specifles the reporting period of event lA. Thatis, event lA is reported at each reporting interval. Usualiy, event lA is LJreported oniy onca. Nevertheless, if the ceil, where event lA is reported,does not join the active set in a specifled period of time, the UE canchange the reporting of event lA into periodical mode to avoid missing of Lmeasurement reports. The event lA of this ceil is reported forPeriodMRfleportNumforlA times with the reporting interval as the setvalue.

Value range: NON_PERİODIC_REPORT, D250, D500, D1000, D2000,D4000, D8000, D16000 [1

n Physical vakıe range: NON_PERİODIC_REPORT, 250, 500, 1000, 2000, L4000, 8000, 16000

Physical unit: ms

• PeriodMRReportNumforlAContent: This parameter specifies the number of reporting times of eventlA for periodical reporting, When the actual reporting times exceeds the [Dset value, the periodical reporting ends.

Value range: Di, D2, D4, D8, D16, D32, D64, INFINITY

o Physical value range: 1,2,4,3, 16, 32, 64, INFINITY

• Set these parameters through SET UINTRAFREQHO/ADDUCELLINTRAFREQHO/MOD UCELLINTRAFREQHO.


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• Report!nterva!forlAD


Intra-Frequency HandoverMeasurement Events (ConL)

lBevent

Event 1 B is triggered on the basis of the following formula:

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Mo,d +CIOO,d Wx(EM)+(1—W)xM81—(Rjb t11b /2)

• MoId is the measurement value of the celi that becomes worse.

• CIOOId is equal ta the sum of CIO and C!OOffset, which is the offset between

the ceil in the reporting range and the best ceil in the active set.

• W represents Weighted factor, used ta weight the quality of the active set. The

total quality of the best celi and the active set is specifled by the parameter

Weight.

• M is the measurement value of a ceil in the active set.

• NB is the number of cells not forbidden ta affect the reporting range in the active

set. The parameter CeI!sForbiddenlB indicates whether adding the ceil to the

active set affects the relative threshofd of event 1 B.

• MBCSt is the measurernent value of the best celi in the active set.

• Rlb is the reporting range or the relative threshold of soft handover. The

threshold parameters of the CS non-VP service, VP service, and PS services

are as foHows:

u IntraReIThdForlBCSVP

IntraReIThdForlBCSNVP

!ntraRelThdForlBPS

• Hlb is the hysteresis value of event 1 B, which is determined by the parameter

HystforlB.

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• The above figure shows the triggering of event 1 B. in this procedure, the defauitparametervaiues are used.

• If the signal quality of a ceil in the active set is lower than Thl B for a period oftime specified by TrigT!melB (Time to trigger in the figure), the UE reportsevent IB.

• Thl B = (CPICH Ec/No of the best ceH in the active set) - (reporting range foreventlB)

• if Weight> 0, then Thl B = (general sig nal quaiity of ali the celis in the active set)- (reporting range for event 1 B).

• Reporting range for event 1 B is equal to the value of IntraRe!ThdForIBCSVP,IntraReIThdForlBCSNVP, or !ntraReiThdForlBPS.

• Conf’ıguration rule and restriction:

The value of İntraReIThdForlBCSNVP has to be larger than that ofIntraReIThdForlACSNVP.

The vaiue of İntraReİThdForlBCSVP has ta be larger than that ofIntraReIThdForlACSVP.The vaiue of İntraReIThdForlBPS has ta be larger than that ofIntraReIThdForlAPS.


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intra-Frequency HandoverMeasurement Events (Cont.)

CPICH EcINo

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• A: signal quality curve of the best cel in the actve set

• 8: signal quality curve of the worst ceil in the aotive set

C:curveofThlB

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Parameters of Intra-FrequencyHandover (Cont.)

Lo• IntraReIThdForlBCSNVP

D Parameter riame: CS non VP service 1 B event relative THD

Recommended vaue: 12, nameiy 6dB

• İntraRelThdForlBCSVP

D Parameter name: VP service 1 B event relative THD

D Recommended value: 12, nameiy 6dB

• IntraReIThdForlBPS

Parameter rıame: PS service 1 B event reative threshold


• IntraReIThdForlBCSNVPflntraReJThdForlBCSVPIIntraReJThdForlBPS

Content: These parameters specify the CS non-VPNP and PS services

relative threshold of event 1 B. The Iower the threshold is, the more easily

the event 1 B is triggered. The higher the threshold is, the harder the

event 1 B is triggered.

D Value range: 0-29

D Physical vaJue range: 0—14.5; step: 0.5

D Physical unit: dB

• Set these para meters through SET UINTRAFREQHO/ADD

UCELLINTRAFREQHOIMOD UCELLINTRAFREQHO.



Parameters of Intra-FrequencyHandover(Cont.)• HystforlB

ı Parameter name: 1 B hysteresis [u Recomnıended value: 0, nameiy 0dB

• TrigTimelB

D Parameter name: 1 B event trigger detay time

D Recommended value: D640, nameiy 640ms

‘D

HystforlBD Content: This parameter specifles the hysteresis value for event 1 B. The

value of this parametercorrelates with slowfading. The larger the valueof this parameter, the Iess possibitity of ping-pong effect or wrongdecision. But the event might not be triggered in time.

Value range: 0—15 Lo Physical value range: 0—7.5; step: 0.5

Physical unit: dB

• TrigTimelB

Content: This parameter specifles the time detay to trigger event 1 B. Thevalue of this parameter correlates with slow fading. The larger the valueof this paranıeter, the Iower the incorrect decision probability, but theslower the response of the event to measurement signal change.

Valuerange: DO, D10, D20, D40, D60, D80, D100, D120, D160, D200,D240, D320, D640, D1280, D2560, D5000

Physical value range: 0, 10, 20, 40, 60, 80, 100, 120, 160, 200, 240, 320,640, 1280, 2560, 5000

D Physical unit: ms

• Set these parameters through SET UİNTRAFREQHO/ADDUCELLINTRAFREQHO/MOD UCELLINTRAFREQHO.

t:!Confidential information of Huawei. No Spreading Without Permission

IS


MNeW is the measurement value of the celi in the reporting range.

CION is the celi inciividual offsetvalue of the celi in the reporting range. it is

equai to the sum of CİO and CIOOffset, which is the offset between the ceil in

the reporting range and the best ceil in the active set.

• MIflAs is the measurement vaiue of the worst ceil in the active set.

• H1 is the hysteresis value of event 1 C, which is determined by the parameter

HystforlC.

Intra-Frequency HandoverMeasurement Events (ConL)• lCevent

Event 1 C is triggered on the basis of the foliowing formula:

MNeW + CIONeİ4, M1+ CIO1+ H1 12

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•

•

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• The above figure shows the triggering of event 1 C. in this procedure, the defaultparametervaues are used.

• If the signal quality of a celi not in the active set is higher than Thl C for a periodaf time specified by TrigT!melC (Time ta triggerin the figure), the UE reportse’ıent IC, as shown in the figure.

ThİC = (CPICH Ec/No of the worst ceB in the active set) + (HystforlCİ2)

The UE reports event IC for qualified celis after the number of cells in the active

set reaches the maximum value. The maximum number of cells in the active setcan be set by the MaxCelllnActiveSet parameter.

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CPICII EN

• A: signal quality curve of the best ceil in the active set

• B: slgnat quality curve of a ceH in the active set

• C: signal quality curve of the worst celi in the aciive set

• D: signal quahty curve of a celi in the monhtored set

E:curveofThlC

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WCDMA Handover Agorithm and Parameters

Parameters of Intra-FrequencyHandover (Cont.)• HystforlC

5

Parameter name: İC hysteresis

D Recommended value: 8, nameiy 4dB

• TrigTimelC

Parameter name: IC event trigger delay time

Recommended value: D640, nameiy 640ms

Content: This parameterspecifies the hysteresis va!ue for event IC. The

value of this parameter correlates with slow fading. The larger the value

of this parameter, the Iess possibility of ping-pong effect or wrong

decision. But the event might not be triggered in time.

D Value range: 0—15

Physical va!ue range: 0—7.5; step: 0.5

D Physical unit: dB

. TrigTimelCD Content: This parameter specifles the time delay to trigger event 1 C. The

value of this parameter correlates with slow fading. The larger the value

of this parameter, the Iower the incorrect decision probabiiity, but the

slower the response of the event to measurement signal change.

Value range: DO, D10, D20, D40, D60, D80, D100, D120, D160, D200,

D240, D320, D640, D1280, D2560, D5000

D Physical value range: 0, 10, 20, 40, 60, 80, 100, 120, 160, 200, 240, 320,

640, 1280, 2560, 5000

D Physical unit: ms

• Set these parameters through SET UINTRAFREQHO/ADD

UCELLI NTRAFREQHO/MOD UCELLI NTRAFREQHO.

• HystforlC



1 C event report mode:

Event trigger report

Event to periodical report

WCDMA Handover Algorithm and Parameters t.rE[Tt

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• The report mode of 1 C is evert trigger report.

• Generaliy the event İC is reported oniy once. However, to avoid measurementreport Ioss, the event İC reporting can be turned to periodical reporting.

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Parameters of Intra-FrequencyHandover(Cont.)• Report!nte,valforl C

Parameter name: IC event to periodical rpt period

Recommended value: D4000, nameiy 4000ms

PerioclMRReportNumforlC

Parameter name: IC event to periodical rpt number

Recommended value: D16

Content: This parameter specifies the number of reporting times of event

1 C for periodical reporting. That is, event 1 C is reported at each reporting

interval. Usualiy, event ‘IC is reported oniy once. Neverthe(ess, if the celi,

where event 1 C is reported, does not join the active set in a specifled

period of time, the UE can change the reporUng of event 1 C intoperiodical mode to avoid missing of measurement reports. The event 1 C

of this ceil is reported for PeriodMRReportNumforlC times with thereporting interval as the set value.

Value range: NON_PERİODIC_REPORT, D250, D500, D1000, D2000,

D4000, D8000, D16000

Physical value range: NON_PERİODIC_REPORT, 250, 500, 1000, 2000,

4000, 8000, 16000

Physical unit: ms

• PeriodMRReportNumforl C

o Content: This parameter specifles the number of reporting times of event

1 C for periodical reporting. When the actual reporting times exceeds the

set value, the periodical reporting ends.

Valuerange: DI, D2, D4, D8, D16, D32, D64, INFINITY

Physical value range: 1, 2, 4, 8, 16, 32, 64, INFINITY

• Set these parameters through SET UINTRAFREQHOİADDUCELLINTRAFREQHO/MOD UCELLINTRAFREQI-1O.

• Reportlnterva!forlC

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• MNDIBeSt is the measurement value of a ceM that is not the best celi.

• CiONotBest is equal to the sum of CIO and C!OOffset, which is the offset betweerı

the celi in the reporting range and the best ceM in the active set.

• MBest is the measurement value of the best ceM in the active set.

• CİO85 is the ceM individual offset value of the best ceil. This parameter is notused for event İD.

• Hıd is the hysteresis value of event 1 D, which 15 determined by the parameterHystforlD.

flA



ntra-Frequency HandoverMeasurement Events (Cont.)• lDevent

Event 1 D is triggered on the basis of the following forrnula:

MNOŞBest + CIOVOİBt + CIOBI + ıı1 d /2

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• The above figure shows the triggering of event 1 D. in this procedure, the default

parametervalues are used.

• If the signal quality of a ceil not in the active set is hig her than Thl D for a period

of time specified by TrigT!melD (Time to trigger in the figure), the UE reports

event 10.

• ThID = (CPICH Ec/No of the best ceil in the active set) + (HystforlDl2)

. A: sinal quality curve of the best ceil in the active set

• C:curveofThlD

• B: signal quality curve of e ceil in the active set ot the monitored set

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Parameters of Intra-FrequencyHandover (Cont.) [• HystforlD

Parameter neme: ID hysteresis


• TrigTimelD

Parameter name: 1 D event trigger delay time

o Recommended value: D640, nameiy 640ms L>

1:,

• HystforlD

Content: This parameter specifies the hysteresis value for event 1 D. Thevalue of this parameter correlates with slow fading. The larger the value

of this paranıeter, the Iess possibility of ping-pong effect or wrongdecision. But the event might not be triggered in time.

o Va1uerange:0-15

o Physical value range: 0-7.5; step: 0.5

Physical unu: dB

• TrigTimelDContent: This parameter specifles the time delay to trigger event 1 D. The

value of this parameter correlates with slow fading. The arger the value

of this paranıeter, the Iower the incorrect decision probability, but theslower the response of the event to measurement signal change.

Value range: DO, 010, D20, 040, 060, D80, D100, D120, D160, D200,

D240, D320, D640, D1280, D2560, D5000

Physical value range: 0, 10, 20, 40, 60, 80, 100, 120, 160, 200, 240, 320,

640, 1280, 2560, 5000

Physical unit: ms

• Set these parameters through SET UINTRAFREQHO/ADDUCELLINTRAFREQHO/MOD UCELLINTRAFREQHO.

[Confidential Informatiorı of Huawei. No Spreading Without Permission

t:t


Contents


1. ntra-Frequency Handover Overview

2. tntra-Frequency Handover Measurement

1. lntra-Frequency H2ndover Measurerneat Quantites

2. ntra-Freqıiency Handover Measurement Events

3. ntra-Frequency Handover Neighboring Celi Combination

Algorithm

3. ntra-Frequency Handover Decision and Execution

4. SinaHng Procedures for Intra-Frequency Handover


t

• After the active set is updated, the RNC updates the neighboring ceil list byusin the neighboring ceil combination algorithm according ta the status of theactive set, This list includes the new intra-frequency, inter-frequency, and interRAT neighboring ceHs. The combination methods of intra-frequency handover,inter-frequency handover, and inter-RAT handover are the same.

• The neighboring ceil combination result is contained in the MEASLJREMENTCONTROL message and sent to the UE, which instructs the UE ta perform intrafrequency, inter-frequency, and inter-RAT measurement and handoverprocedures.

• The maximum number of neighboring celis of a ceil that can be configured is asfollows:

The maximum number of intra-frequency neighboring celis is 32, whichincludes the celi itseif

The maximum number of inter-frequency neighboring celis of singlecarrier is 32

The maximum number of inter-frequency neighboring celis of 2 carriers is64. No more than 2 carriers of inter-frequency cells can be configured

The maximum number of inter-RAT neighboring cells of multi-carrier is32

WCDMA Handover Agorithm and Param eters

Neghboring Celi CombinationAtgorithm

___ ___ ____

Celi A, CelI 6 and Celi Cara n active set. Ceil A edıe best cet. Cali 6c/No la greater thanCeIIC.

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WCDMA Handover Aigorithm and Parameters

Neighboring ceil combination switch:

HO_MC_NCELLCOMBINE_SWITCH is the neighboring ceI combination

switch.

If the switch is set to ON, measurement objects are chosen from theneighboring celis of ali the ceils in the active set.

If the switch is set to 0FF, measurement objects are chosen from theneighboring celis of the best celi.

Neighboring celi combination procedure:

• After obtaining the intra-frequency zıeighboring ceUs of each ceil in the active set,

the RNC calculates the union neighboring celi set of the intra-frequency celis,which is referred as Sa11, by using the foilowing methöd. This method can also be

used to generate the SalI of inter-frequency or inter-RAT celis.

The intra-frequency, inter-frequency, and inter-RAT neighboring celis ofeach ceil in the current active set are obtained.

ı The RNC sequences the celis in the active set in descending order ofCPICH Ec/No according to the latest measurement report (event lA, IB,İC, or 1 D) from the UE. The best celi is based on event 1 D, whereasother celis are based on the latest measurement report.

The celis in the active set are added to S211.

The neighboring celis of the best celi in the active set are added to Sa11.NprioF!ag (the fiag of the priority) and Nprio (the priority of theneighboring ceil), which are set for each neighboring ceil, are used tochange the order of adding the neighboring celis to Sa11

The neighboring celis of other celis in the active set are added to 5aıı indescending order by CPICH Ec/No values of these celis in the active set.The neighboring celis of the same ceil in the active set are addedacoording to Nprio and the number of repeated neighboring ceil isrecorded.

Ifthere are more than 32 intra-frequency neighboring celis in S1, deletethe repeated neighboring celis whose number in Sa11 İS Iess. The top 32neighboring celis are grouped into the final The limit of 32neighboring cells is the same for the inter-frequency neighboring celis.


t.


rParameters of NeLghborıng CeliCombination Algorithm [e HO_MC_NCELL_COMB!NE_SWITCH

Parameter narne: Neighboring Ceil Combination Switch [Recommended value: ON

• NprioF!ag [Parameter name: The flag of the priority

Recommended value: FALSE

• Nprio it

Parameter name: the priority of the neighboring ceil

Recommended vatue: None

.

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• HO_MC_NCELL_COMBINE_S WITCHContent: When the switch is on, the neighboring celi combined aigorithmis used during the deOvery of the objects ta be measured. When theswitch is off, the best ceil algorithrn is used.Value range: ON, 0FFPhysical value range: 1, 0Set this pararneter through SET UCORRMALGOSWITCH.

• NprioFlagContent: Priority identifier of neighboring celis. TRUE indicates that theneighboring celi priarity is valid in the aTgorithm of neighboring ceilcombination. FALSE indicates that the neighboring celi priority is invaid,and, in the algorıthm of neıghbohng ceil corn bination, the celi with invalidpriority is the last one ta be considered as the measurement object.Value range: FALSE, TRUE iiPhysical value range: FALSE, TRUESet the upper two parameters through ADD UINTRAFREQNCELL/MQ.İUINTRAFREQNCELL / ADD UINTERFREONCELLIMODUINTERFREQNCELL t ADD U2GNCELL/MOD U2GNCELL.

• NprioContent: Priority of neighboring cells. The ower the priority, the easier itis for the neighbaring ceil ta be delivered as the measurement object. Forexample, it is more possihle for a neighboring ceil of priority 1 than a celiof priorıty 2 ta be delivered as the rneasurement object.Value range: 0—31Physicai value range: 0-31; step: 1Set the upper two parameters through ADD UINTRAFRQNCELL/M0DUINTRAFREQNCELL / ADD UINTERFREQNCELL/MQIUiNTERFREONCELL / ADD LJ2GNCELL/MOD U2GNCELL.

Confidential Information of Huawei, No Spreading Without Permission L

E


Contents


1. lntra-Frequency Handover Overview

2. 1ntraFrequency Handover Measurement

3. lntra-Frequency Handover Decision and Execution

4. Signaiing Procedures for lntra-Frequency Handover


1.


When receiving an event lA report, the RNC decides whether taadd a ceil.For event lA, the UE can report more than one celi in the eventlist in one measurement report. These cells are in the list of theMEASUREMENT CONTROL message, and they are sequencedin descending order of measurement quantity. For the celis in thelist, the RNC adds the radio link ta the active set oniy if thenumber of celis in the active set does not reach the maximumvalue. This operation is not required if the number of celis in theactive set reaches a specifıed value.

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tntra-Frequency Handover Decisionand Execution• The intra-frequency handover decision and execution

procedure depends on the clifferent measurement events

that the RNC receives:

lAEvent

lBEvent

lCEvent

lDEvent

lA

When receiving an event 1 B report, the RNC decides whether ta

delete a ceil. For event 1 B, if there is more than one radio link in

1 B the active set, the RNC decides whether ta delete a radio link.This operation is not required if there is only one radio link in the

active set.

When receiving an event 10 report, the RNC decides whether ta

change the worst celL For event İC, the UE reports a ist that

1contains good cells and the celis to be replaced, and sequences

the cells in descending order by measurement quantity. After

receiving the list from the UE, the RNC replaces the bad cells inthe active set with the good cells in the list.

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WCDMA Handover Algorithnı and Parameters

As stipu(ated in related protocols, an event İD report includes

information about oniy one ceil. This celi can be listed in anactive set or a monitored set. The RNC Iearns that the quality of

this ceil is better than that of the serving celi and takes one of

the following actions: If the reported celI is in the active set, the

RNC decides whether to change the best ceil or reconfiguremeasurement control. tf the reported ceII is in the monitored set,

1 D then: If the number of celis in the active set has not reached the

maximum value, the RNC adds the ceil to the active set. If the

number of celis in the active set has reached the maximumvalue, the RNC replaces the worst ceil in the active set with the

reported ceil. The best ceil is changed to the reported celi. The

RNC determines whether the intra-frequency hard handover

scenarios are applicable. If any scenario is applicable, the RNCperforms an intra-frequency hard handover.


L

WCDMA HandoverAlgorıthm and Parameters

rParameters of Intra-FrequencyHandover (Cont.) [

MaxCelllnActiveSet

D Parameter name; Max number of celi in active set [u Recommerıded value: 3

SHOQua!min

D Parameter name: Mm quality THD for SHO

D Recammended value: -24, nameiy -24dB

L

IZContent: This parameter specifies the maximum number of celis iri theactive set. This parameter can achieve the balance between the signalquality in the SHO area and the performance of the system. The morecells the active set contains, the larger macro diversity gam the user (1obtains in the SHO area, and the smaller the intra-frequency interferenceis. But in this case, the user occupies resources of several celis, whichincreases the amount of data ta be processed by the system and Iowersthe system performance.Va(ue range: 1—6Physical value range: l-6; step: 1 -

• SHOQuaIminContent: When the RNC receives events lA, 1 C and 1 D, the target ceilcan be added to the active set oniy when CPICH Ec/No of the target ceilis higher tharı this absolute threshold.Value range: -24--OPhysical value range: -24--O; step: 1

D Physical unit: dB• Set these parameters through SET UINTRAFREQHO/ADD

UCELLINTRAFREQHO!MOD UCELLI NTRAFREQHO.

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Estimation Procedure for RateReduction

WCDMA HandoverAlgorithm and Parametersf.(TEEtE<T(T<T

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• If the RNC receives a lA, İC, or İD measurement report, the RNC tries ta addthe corresponding ceil to the active set. If the addition fails, the RNC performsthe estimation procedure for rate reduction.


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Estimation procedure for rate reduction:

Stepi:The RNC evaluates whether the measurement quantity of the ceil failing

to be admitted meets the condition of rate reduction.

• If the condition is met, the RNC performs a rate reduction processfor the access service immediateiy, as described in the nextsection Procedure of Rate Reduction Execution.

• If the condition is not met, the RNC performs the step 2.

The condition of rate reduction is as follows: Mnew > Mbest ceI -

RelThdForDwnGrd

• Mnew is the CPICH Ec/No measurement vaiue of the ceM failing tabe admitted.

• MbstceII is the CPICH Ec/No measurementvalue of the best celiin the active set.

• RelThdForDwnGrd is configured through the parameter Relativethreshold of SHO failure.

Step2:

The RNC evaluates whether the number of SHO failures in the ceMexceeds the Threshod number of SHO failure.

If the number of SHO failures in the ceM is smaller than theShoFailNumForDwnGrd:

If the timer has not been started, the RNC starts it.

• f the timer has been started, the RNC increments the SHO failurecounter by one.

The timer Iength is set through the parameter ShoFallPeriod.

The SHO failure counter of a ceM is used to record the number of SHOfailures in this ceM. For each UE, the RNC records the number of SHOfailures in three celis at most. For SHO failures in any other celis, theRNC does not record the number.

Before the SHO failure evaluation timer expires, na action is taken andthe RNC waits for the next measurement report period.

When the SHO failure evaluation timer expires, the RNC sets the SHO

failure counter of the corresponding ceM to 0 and ends the evaluation.

If the number of SHO failures in the celi is larger than or equal ta theparameter ShoFailNumForDwnGrd, the RNC performs a rate reductionprocess for the access service.


WCDMA Handover Algorithrn and Parameters

Parameters of Intra-FrequencyHandover(Cont.) [• RelThdForflwnGrd

[1Parameter name: Reative threshold of SHO failure tRecommended value: 2, nameiy 1dB

• ShoFaiIPer!od

Parameter neme: Max evaluation period of SHO failure

Recommended value: 60, nameiy GOs [• ShoF3iİNumFarDwnGrd

Parameter name: Threshold number of SHO failure ÇRecommended value: 3

E

• Re!ThdForDwnGrd

Content: This parameter specifles the threshold of immediate ratereduction after the soft handover failure.

Value range: -29-29

Physical value range: -14.5--14.5; step: 0.5

Physical unit: dB• ShoFailPeriod

o Content: This parameter specifies the maximum evaluation period of the [soft handover failure. When the rate reduction evaluation is performed ona celi that fads to join the active set, the evaluation timer is started. If theceil cannot fulfill the condition of rate reduction before the timer expires,the evaluation and rate reduction retry on the ceil wili not be performed.

Value range: 0-120

Physical value range: 0—120; step: 1

Physical unit: s• ShoFai!NumForDwnGrd

Content: This parameterspecifles the threshold number of the softhandover faflures. This parameter determines the reporting times of theevents from the ceil that falis to join the active set in soft handover, totrigger the rate reduction of the active set and the attempt to join theactive set.

Value range: 0-63

Physical value range: 0-63; step: 1• Set these parameters through SET UINTRAFREQHO.

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1f


Procedure of Rate: Reduction Execution

• The RNC performs a rate reduction process for the access service. The methodof determining the access rate after the rate reduction is the same as thatdescribed in rate negotiation of bad control course.

• After the rate reduction succeeds, the RNC immediateiy attempts to add this celito the active set without measurement:

If the celi succeeds in admitting the UE, the RNC adds the radio link andsets the SHO failure counter of the celi to 0 and ends the execution.

If the celi fails to admit the UE, the RNC starts the Period of penalty timerfor SHO faibure after down rate to avoid an increase in the rate triggeredby DCCC within the period. Also in this period, the RNC sets the SHOfailure counter of the celi to 0 and ends the execution.



cParameters of Intra-FrequencyHandover(ConL) [

DcccShoPenaityTime

Parameter name: Period of penalty timer for SHO failure after Edown rate

Recommended value: 30, namey 30s fl

Copyrıght 2012 HuaWei TecrrnoIogIes 00 LId Ali righis reserved HUAW€I cDcccShoPenaltyTime

Content: This parameter defines the Iength of penalty tirner for SHO 1’failure after rate red uction in the active set. When the rate reduction in Lthe active set is performed which triggers the increase of SHOs in thetarget celi, if the target ceil fails to ioin the active again, the RNC startsthe penalty timer for SHO failure. This parameter defines the Iength ofthe penalty timer. Before the timer expires, the rate increasing in theactive set is prohibited, but rate reduction is not prohibited.Value range: 0255Physical value range: 0—255; step: 1

Physical unit: sSet this parameterthrough SET UINTRAFREQHO. U

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Ect:


n


Contents


1. ntraFrequency Handover Overview

2. lntra-Frequency Hndover Measurem€nt

3. lntra-Frequency Handover Decision and Execution

4. Signaling Procedures for Intra-Frequency Handover

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cTypical Soft Handover Ftow ([3 Signaling)

Soft handover is triggered by İNİ B/l C or 1 D event

LJ FZZ— FRDConnection tup Rocedure—1

Meaairement Contro---

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Copyroht 2012 Nzeı Tecnooges Co Ud Ali rigits reserved Page55 HUAWEI

cThe soft handover procedure comprises the following steps:

Based on the Measurement Control information from the RNC, the UE

measures the intra-frequency neighboring cells, and reports the

measurernent result ta the RNC via Measurement Report.

The RNC compares the reported measurement result with the set

threshold ta decide the celis to be added and deteted.

(fsome cells are ta be added, the RNC notifies the Node B ta get ready.)

The RNC notifies the UE ta add andfor deete cells via the Active Set

Update message. t)After the LİE successfully update the active set, UE wiil send Active Set

Update Complete ta inform RNC. r(if the celis ara deeted, the Node B wilI be notified ta release the Lcorresponding resources.)

After the soft handover, perhaps the measurement control information [changes, if it is, RNC wiil send new MeasurementContro!to UE.

• The original communication is not affected during the soft handover procedure sa [that smooth handover from a cefl ta another can be successfully campleted.

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Intra-Frequency Hard Handover

Ihtra-Frequency hard handover is triggered by 1 D event

RCcznhection tup Focedi.jrc

1 —Measirenient cbnttol (Intra-freq)

Measjrement Eport (1D)—--—

tup

—FbycaI Oian net Fcönfigüration

—FiıycaI channel Fconfiguration ODmp[ete-ı

Control (Intra-F?eq)-

DntoewR

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Contents

1. İntra-Frequency Handover

2. Inter-Frequency Handover

3. nter-RAT Handover


1

T Contents


1. lnter-Frequency Handover Overview

2. InterFreq uency Handover Measurernerıt

3. 1nterFrequency Hand.over Decison and Execution

4. 8gn ating Procedu res for 1nterFrequency Ha ndover

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WCDMA Handover Algarithm and Pararneters

r!nter-Frequency Handover Types r• The carrier frequency of the current ceil and target ceil ara

different

Based on the triggering causes of handover, inter-frequency

handover can be categorized into three types:

D Coverage-based inter-freq uency handover2(14_ziĞ?() tj , p

D QoS-based inter-frequency handover ‘

ie ( -)D Laad-based inter-frequency handover

Copynght © 2012 kıaweı Tectrnologıes Co Ltd P11 ııgbts reseved Pa.gee0 HUAWEI

t,• Caverage-based inter-frequency handover:

a If a moving UE leaves the coverage of the current frequency, the RNCneeds to trigger the coverage-based inter-frequency handover ta avaidcali drops.

• QoS-based inter-frequency handover:

D According to the Unk Stability Control Algorithm, the RNC needs tatrigger the QoS-based inter-frequency handover ta avoid cail drops.

• Laad-based inter-frequency handover:

D Ta balance the bad between inter-frequency con-coverage cells, theRNC chooses some UEs and performs the inter-frequency blindhandover according to user prioritles and service prİorities. L

• The FnterFreqHoSwitch parameter in the ADD UCELLHOCOMM command is

used to chooses the inter-frequency measurement control parameters taimplement handover measurement based on coverage and QoS.

• The HO_İNTER_FREQ_HARD_HO_SWITCH parameter in the]UCORRMALGOSWITCH command is used ta determine whether ta allow badbased inter-frequency handover. [

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; Contents


1. lnter-Frequency Handover Overview

2. Inter-Frequency Handover Measurement

1. inter-Frequency Handover Measurement Switches

2. InterFrequency H8ndovr Measuernent Report Modes

3. Inter-Frequency Handover Meesurement vents

4. nter-Frequency Handover Measurernent Ouarıtity

5. nterFrequency Handover Compressed Mode

3. nter-Frequency Handover Decsiorı and Execution

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4. Signaiing Procedures for Inter-Frequency Handover

WCDMA Handover Algonthm and Pararneters

rInter-Frequency HandoverMeasurernent

in the measurement phase of inter-frequency handover, the

UE takes measurement according to the MEASUREMENT FCONTROL message received from the RNC. When the

measurement report conditions are met, the UE sends

measurement reports to the RNC according to the rules

defined in the MEASUREMENT CONTROL message.

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HO_MC_SIGNAL_SWITCH:

If the switch s set ta ON, the RNC initiates the active set quality

rneasurement after the RRC connection setup is completed (before the

RB setup).

If the switch is set ta 0FF, the RNC initiates the active set quaity

measurement after the RB setup is completed.

The switch is set ta 0FF by defauit.

• HOJNTER_FREQHARD_HOSWITCH

If the switch is set ta ON, the RNC enables the inter-frequency handover

measurement and the İoad-based inter-frequency handover.

If the switch is set ta 0FF, the RNC disables the inter-frequency

handover measurement.

The switch is set ta ON by defa ult.

• These switches are the parametervalues of Handover algorithm switch in the

command SET UCORRMALGOSWITCH

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Inter-Frequency HandoverMeasurement Switches

Switches reiated ta inter-frequency handover:

HO_MC_SIGNAL_SWITCH: The switch decides when the

RNC performs the active set signal quality rneasurement.

HOJNTER_FREQJ-IARD_HO_SWITCH: The switch decides

whether ta enable the inter-frequency handover measurement

2012 CoLtd,A rghtsrervd PageS3 HUAWE

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3wcdma Ran14 Radio Net Fea Alg Tr1 Ho1

Documents

handover decision

softer handover

4le0q handover algorithm

set of celis

permisson handover types

detected set

btrafrequency handover

radlo link set