mobility in umts.ppt

8/11/2019 Mobility in UMTS.ppt

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September 2010

Ridha Nasri

OF/ DTF/ DPPR/ UPR IDF/ IRM/ International Support

[email protected]

Mobility in UMTS
mailto:[email protected]:[email protected]


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MOBILITY IN UMTS 2 Groupe France Tlcom

Mobility Overview

Soft!andover

!ard !andover InterFre" # InterR$T

Summary:


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Mobility Overview

Handover is a basic function of a cellular mobile network.

Te purpose of andover is to insure te continuity of service durin! mobilityHandover includes te followin! types:

RNC

Soft-Handover

Intra-Freq

Hard-Handover

Intra-Freq

(Due to IuR unavailabilit!

1 2

IuR Not Avaiabe

Node !

1 2

Hard-Handover

Inter-FreqHard-Handover

Inter-R"T

1

2


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MOBILITY IN UMTS " Groupe France Tlcom

Mobility Overview

Soft!andover


Summary:


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MOBILITY IN UMTS # Groupe France Tlcom

Soft!andover

Te Soft$Handover !ives te %& te possibility to connect simultaneously to

multiple cells' tus improvin! its radio conditions and (oS.

)t relies on te %&*+ode,-s introduction of te Ra%e Re&eiverwic consists ofseveral parallel Ra%e fin'ers/i!ital Si!nal 0rocessors1' makin! tem able to

process simultaneously multiple radio links.

Ce 1 Ce 2

#ell $

#ell $

#ell %

#ell %

#ell $ #ell %

"C#IC$ %c&N0' "C#IC$ %c&N0'

Intra-frequen& hard 'andover

Intra-frequen& soft'andover


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MOBILITY IN UMTS Groupe France Tlcom

Soft!andover Types

IuR

Iu!

RNC1 RNC2

(SC

Node!1 Node!2 Node!)

Softer-Handover

(Intra-NodeB!

Soft-Handover

Intra-RN#Soft-Handover

Inter-RN#


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Soft!andover( Two U) Reportin' Modes

RNC*%

RRC (easurement Contro

#eriodica Reporting

RRC (easurement Report

AS Ces + ,/.. !est (easured Ces




Configurabe

#eriod in ms

RNC*%


%vent 1A1!1C11%


%vent 1A Ce 1

RRC (easurement Report%vent 1A Ce /


%vent 1! Ce1

Sent on

hen certain

Radio

conditions

are met

%vent Reporting#eriodica Reporting

+#eriodica Reporting3T'e *obile &ontinuou)l )end) *ea)ure*ent) to t'e RN# ,'i&' ro&e))e)

t'e* to deter*ine t'e ne.t de&i)ion Di)advanta/e0RN# ro&e))e) t'e *ea)ure*ent)

+%vent Reporting3T'e U1 &ontinuou)l *onitor) nei/'borin/ &ell) but onl reort) to t'e RN# ,'en

&ondition) are *et "dvanta/e0Le)) RN# ro&e))in/ and le)) )i/nalin/ Load

Active Set *pdate

45617

Active Set *pdate

451/7


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Soft!andover( Nei'hborin' Sets *ana'e*ent

$

8A

I!

%9

$

8A

I!:

%9

C

+Neighboring ;ist3Li)t of &andidate &ell) for *ea)ure*ent2 t'i) li)t i) )ent b t'e RN# to t'e U1 and i) udated dna*i&all

+Active Set3T'e li)t of Radio Lin3) e)tabli)'ed b t'e U1 (4'en in Soft5SofterHO!6 3GPP: Max 6 RL per UE (Active Set)

+(onitored Set3T'e li)t of #ell) bein/ *ea)ured b t'e U1 (1.&ludin/ t'e "&tive Set!

+etected Set3T'e li)t of #ell) dete&ted and reorted b t'e U12 t'e do not belon/ to t'e nei/'borin/ li)t )end b t'e RN#

Active Set

A

Active Set

A

!

Note: The cells in the UEs Active Set

are or!ere! "# their $P%$&'EcNo Level

ro* +est to ,orse- The "est cell is calle!

the Pri*ar# $ell

#rimar

Ce

Ce !eonging to the A.S.

Ce !eonging to the (.S.

Ce !eonging to the .S.

#rimar

Ce


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Soft!andover( Nei'hborin' +ist Pro&essin'

$

8A

I!:

%9

C


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Soft!andover( )vents Introdu&tion

Measure*ent "uantity &ould be(

,PI,! )&/No ,ell -uality

,PI,! RS,P ,ell +evel

U) reports *easure*ent results to the RN, throu'h the followin' events(

)vent Des&ription

.$$ ,ell fro* the Monitored Set is within of an a&&eptable ran'e ,PI,! )&No or ,PI,! RS,P0 of the Pri*ary

,ell1 In other words2 a relatively 'ood &ell is available and &an be added to the $&tiveSet1

.3$ ,ell fro* the $&tive Set has 'otten outside the a&&eptable ran'e ,PI,! )&No or ,PI,! RS,P01 In otherwords2 a relatively bad &ell &an be re*oved fro* the $&tiveSet1

.,., is a &o*bination of .$4.32 ., is sent when the $&tiveSet has rea&hed its *a5i*u* 6 operator &onfi'ured 7si8e2 and a *onitored &ell is better than the worse &ell of the $&tiveSet1 Thus as%in' the RN, to repla&e the worse$S ,ell with the best Monitored ,ell1

.D $ &ell fro* the $S has be&o*e better than the pri*ary &ell( $s%in' the RN, to set a new pri*ary &ell1


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Soft!andover( )vents .$2.3

$

8A

I!

%9

$

8A

I!

:

%9

C

%vent 1A3 Ce !

%cNo3 -12 d!

Active Set *pdate4A!7

(easurement Contro

4A! %98$I:C7

*%1=s Ne

Active Set

A

!(easurement Contro

4A! %98$I7

$

8A

I!:

%9

C%vent 1A %vent 1!

%vent 1!3 Ce A

%cNo3 -12 d!

Active Set *pdate

4!7

(easurement Contro4! AI:C%7

*%1=s NeActive Set

!

%ven though it=s the *% hich is sending the S$ %vent the utimate ecision is made b the

RNC after verifing and preparing the Active Set *pdate ? message from the RNC.


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Soft!andover( )vent .$

,ondition( )&No9of9Monitored9,ell : 3est9,ell ; Reportin'9Ran'e9.$

Note:To ensure stability and prevent ping-pong due to fast fading effects, the condition should be met during a certain

time called Time to Trigger after the Time to Trigger (TTT1A) expiry, the Event 1A is sent to the R!

Ti*e to tri//er

1vent $" i) tri//ered

B

"

C#IC$ %c&N0


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MOBILITY IN UMTS 6" Groupe France Tlcom

Soft!andover( )vent .3

,ondition( )&No9$&tiveSet9,ell < 3est9,ell ; Reportin'9Ran'e9.3

Note:To ensure stability and prevent ping-pong due to fast fading effects, the condition should be met during a

certain time called Time to Trigger after the Time to Trigger (TTT1") expiry, the Event 1" is sent to the R!

Ti*e to tri//er

1vent $B i) tri//ed

B

"

C#IC$ %c&N0


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Soft!andover( )vent .,

,ondition( )&No9Monitored9,ell : )&No9+ast9,ell9$S 4 !ysterisis9.,

Note:To ensure stability and prevent ping-pong due to fast fading effects, the condition should be met during a

certain time called Time to Trigger after the Time to Trigger (TTT1!) expiry, the Event 1! is sent to the R!


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SRNS Relo&ation( U) Uninvolved

The SNRS Relo&ation o&&urs when the U) releases its last Radio lin% with its servin' RN,1

It allows to route the user data fro* the ,ore Networ% to the new Servin' RN, dire&tly1 =ith this pro&ess2 the IuR and old

Servin' RN,>s resour&es are freed1

This *e&hanis* is transparent to the U)1

IuR

(SC

Node !

Serving RNC rift RNCIuR

Node !

RNC Serving RNC

1

)

2

*%1 in Soft $andover*%1

ata *%1

ata *%1


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Mobility Overview

Soft!andover


Summary:


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MOBILITY IN UMTS 65Groupe France Tlcom

Overview of !andover Pro&edures

The InterFre"uen&y / InterR$T !ard !andover in&ludes four phases(

!andover tri''erin' !andover *easure*ent !andover de&ision

!andover e5e&ution

Handover ro&edure tri//erin/


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InterFre"uen&y / InterR$T !ard!andover tri''erin'

The InterFre"uen&y !andover is a &han'e of ,arrier/Fre"uen&y within the UMTS syste* durin' the U)>s &onne&tion1

The InterR$T !andover is a &han'e of Radio $&&ess Te&hnolo'y ?@ to A@ or A@ to ?@02 durin' the U)>s &onne&tion1

? Reasons *i'ht lead to either InterFre"uen&y or InterR$T !!O( Radio(3ad Radio3ad Radio ,onditions on the a&tual ,arrier/Fre"uen&y

,$,( The servi&e establish*ent failed be&ause of la&% of resour&es ,all $d*ission Failure ,$,,all $d*ission Failure ,$,0

Servi&e( The &all is served better on another Fre"uen&y / R$T better -oS Settin'sbetter -oS Settin's0

)8 91

)8 92

28


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InterFre"uen&y / InterR$T !ard!andover Tri''erin'

Radio

The InterFre"uen&y / InterR$T !andover is tri''ered when the Pri*ary ,ell of the $&tive Set

has bad radio &onditions1 In order to save the &all2 the U) has to be *oved to another &arrier1

! A)8 91

)8 92

28

C#IC$G%cNoGofG#rimarGCe

H %cNoG(in

R

C#IC$GRSC#GofG#rimarGCe

H RSC#G(in*%1=s

Active Set

A

!

#rimar

Ce


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+ $sterisis&2

- $sterisis&2


Radio( )vent AD

*%1=s

Active Set

A

!

#rimar

Ce

Ti*e to tri//er 2

%vent 2 is trigged

"

C#IC$ %c&No


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+ $sterisis&2

- $sterisis&2


Radio( )vent AF

C#IC$G%cNoGofG#rimar

GCe %cNoG(in

R

C#IC$GRSC#GofG#rimar

GCe RSC#G(in

*%1=s

Active Set

A

!

#rimarCe

Ti*e to tri//er 29

%vent 29 is trigged

"

C#IC$ %c&No


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MOBILITY IN UMTS 2"Groupe France Tlcom


+oad # ,$,

)8 91 RBB Services

)8 92 RBB J $SD#A Services

28 Koice Cas

$e RNCL I oud iFe

to estabish a RBB Ca

RNC


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MOBILITY IN UMTS 2#Groupe France Tlcom


Servi&e

)8 91 RBB Services

)8 92 $SD#A Services

28 Koice Cas

$e RNCL

I oud iFe

to estabish

a ata Ca

RNCF (obie. %stabishour ca on 92

F. 8o to

8S(L

$hhmm..

A voice Ca

#easeL

In this tpe of $andover the operator defines a service handover strateg b setting preferences

for each carrier & RA< on the netorF in function of the tpe of service.

Oe consider that the Signaing RRC Connection is aread estabished.


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!ard!andover Measure*ent( Tar'et ,arrier # Nei'hborin' +istIn &a)e of Servi&e5#"# HHO after t'e Handover need 'a) been verified2 t'e ne.t )te i) to de&ide ,'i&'

Tar/et #arrier or R"T t'e U1 )'ould *ea)ure and /o to6 T'e)e referen&e) are )et b t'e oerator6

In &a)e of Handover due to Radio #ondition)2 and in order to find raidl a )uitable &ell2 )o*e

vendor) allo, t'e U1 to evaluate t'e 78 9 %8 &on)e&utivel before *a3in/ a HHO de&i)ion6 T'i)In&rea)e) t'e robabilit of findin/ a /ood &ell6 Ot'er,i)e2 t'e oerator )e&ifie) t'e referen&e)6

In an &a)e2 t'e RN# 'a) to )end a Nei/'borin/ Li)t0 Inter-9re & Inter-RA< & !othInter-9re & Inter-RA< & !othto t'e U16

T,o *et'od) &an be u)ed b RN# for &reatin/ t'e li)t)0 Si*le 5 #o*oundin/ Nei/'borin/ Li)t)6

For *ore infor*ation lea)e refer to t'e SHO )e&tion6

CA

%

98

!

N(

#

;

)8 91

2 8

N(

#

;

)8 92

RNC*%


%vent 2


Kaues for / !est (easured

Compressed (ode Activation


Inter-9re (easurements

92 Ce ;(N#


Kaues for ;(N#


M


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!ard!andover Measure*ent( ,o*pressedModeDue to t'e fa&t t'at *o)t of t'e UMTS *obile) are *ono-frequen&2 If a *obile 'a) a &onne&tion ( RR#

or RR# : Servi&e! on t'e initial frequen&2 it &annot *ea)ure &ell) on anot'er frequen& 5 te&'nolo/6

Ho, &an t'e *obile t'en evaluate t'e radio &ondition) on ot'er frequen&ie);

T'e &o*re))ed Mode0 It allo,) to &o*re)) t'e data in one or *an radio )lot) (double t'e rate! in orderto free ot'er )lot) and be able to 'o to ot'er frequen&ie) )'ortl6

CA

%

98

!

N(

#

;

)8 91

)8 92

1 2 ) , / 5 T B 10

1 2 ) / 5 T B 10

,

UL Ra!ioUL Ra!io

ra*era*e

8ap to measure other freuencies

Ratedoubed

during

2


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!ard!andover Measure*ent( Reportin'") in an UMTS )ituation2 reortin/ &an be *ade eriodi&all or on an 1vent Ba)i)6

In *o)t of t'e &a)e)2 T'e #o*re))ed Mode reortin/ for HHO i) &onfi/ured in eriodi&al *ode6

T'i) allo,) t'e RN# to i&3 t'e *o)t adated &ell (Not onl fro* a radio but al)o fro* a ;oad;oadoint-of-vie,6

Compressed mode#attern

Compressed mode duration

Norma mode

#eriodic (easurement

Reports(R (R (R

Ho,ever2 event ba)ed reortin/ i) )till available and < reortin/ event) are &reated for t'e HHO Reortin/

ba)ed on radio &ondition)6

Durin/ t'e #o*re))ed Mode2 ,'en t'e U1 find) a /ood &ell()!2 it )i/nal) it 5 t'e* to t'e RN# t'rou/'

event)0

2A34'en t'e Handover Tri//er i) Radio2 if t'e U1 find) one or *an Inter9re&ell ,it' an %cNo %cNoG2A

2!34'en t'e Handover Tri//er i) ;oad2 if t'e U1 find) one or *an Inter9re&ell ,it' an %cNo %cNoG2!

)A34'en t'e Handover Tri//er i) Radio2 if t'e U1 find) one or *an interRA


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MOBILITY IN UMTS25 Groupe France Tlcom

!andover De&ision and )5e&ution

On&e the RN, re&eives the first report it will(

/ecide weter te radio 8uality of reported 3G * GS9 cells meets te

conditions for HH Tresold levels are set trou! confi!urable parameters1.

)f multiple cells are reported in &vent*0eriodical mode' rankin! is applied

takin! te load of tose cells into account ;ess loaded ave i!er priorities1.

Start te si!nalin! < protocol e=can!e wit te tar!et >ore +etwork' ?+S'

,SS ostin! te tar!et cell and reserve te needed resources.

Send te HH e=ecution to te mobile.

)f no cell is found te >ompressed 9ode will continue until te HH timere=pires.


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MOBILITY IN UMTS37 Groupe France Tlcom

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