3g Handover Issues

7/18/2019 3g Handover Issues

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3G (UMTS) HANDOVER

ISSUES Team Members: Cuong Pam

! Tomas Truong



Han"o#er $n ne%&or'



UMTS Han"o#erIn%rass%em Han"o#er:

In%ra*re+uen, HO

In%er*re+uen, HOIn%erss%em HO

- D$.eren% ra"$o a,,ess %e,no/og$es (e0g0

UMTS an" GSM1EDGE)- D$.eren% ra"$o a,,ess mo"es (e0g0

2DD1CDMA an" TDD1TDCDMA)



Hard handoverHard handover `break-

before-make' is applied

when the user’s equipment

communicates with only

just one Node B

!onnection with the old

Node B is broken before

the new connection isestablished



Soft handover"# is located in the covera$earea of two or more different

Node Bs %he "#simultaneouslycommunicates with two or

more Node Bs via two ormore radio channels &received si$nal in Node B isrouted to the N! (adio

Network !ontroller) %heN! compares the si$nal onthe frame by- frame basis%he best frame is selected forthe ne*t processin$+ theothers frames are discarded



Softer handover,ofter handover is

similar to soft

handover %he maindifference between

these two handovers

resides in fact that a

"# is located in thecovera$e area of two

sectors of one Node B





Han"o#er PasesHan"o#er "e%e,%$on

Han"o#er 4re4ara%$on

Han"o#er e5e,u%$on



Handover Detection One o* %e res4ons$b$/$%$es o* %ean"o#er en%$% $s mon$%or$ng an"

%r$gger$ng %e an"o#er0



Handover Preparation In %$s 4ase6 %e an"o#er en%$%re+ues%s *or %e o%er ne%&or's

resour,e a#a$/ab$/$% $n*orma%$on0





Handover Procedure

HO access

BTSold BSCnew

measurement

result

BSCold

Link establishment

MSCMSmeasurement

report

HO decision

HO required

BTSnew

HO request

resource allocation

ch. activation

ch. activation ackHO request ackHO commandHO commandHO command

HO completeHO completeclear commandclear command

clear complete clear complete



Hard HandofProcedure



. ("/%,)

Sot HandofProcedure



MTS !adio "ccess #etwork "rchitecture $

Mobilit% and Handover &ssues!#C' !adio #etwork Controller !#S' !adio #etwork Subs%stem

!#C

&ub

!#S

C#

!#C

&ub

!#S

&ur

&u

#ode B

#ode B#ode B

#ode B#ode B

#ode B

#ode B

(

T!"# comprises several

!#Ss

#ode B can support )** orT** or both

!#C is responsible +or

handover decisions requirin,si,nalin, to the (

Cell o++ers )** or T**



UMTS HO A/gor$%m Te a/gor$%m sam4/es %e s$gna/s%reng% o* %e surroun"$ng base

s%a%$ons e#er 7 se,03"8 %reso/" *or so*% an"o#er0

9"8 %reso/" *or ar" an"o#er0

Te s$e o* %e A,%$#e Se% $s 3s$gna/s



SHO A/gor$%m1. Each UE is connected to its Primary_BS, and keeps

an Active_ Set (2 c!osest" ce!!s#

2. Each UE meas$res the S%& received from the

s$rro$ndin' ce!!s.

. %f (AS1_S%& ) Pr_BS_S%&# *dB +& (AS2_S%& )Pr_BS_S%&# * dB

UE enters Soft Handover

UE keeps a sim$!taneo$s connection to thePrimary_BS and one or -oth of the Active_Setce!!s



HHO A/gor$%mei'h-orin' ce!!s rep!ace the ce!!s in the Active_Set if

their S%& e/ceeds the Active_Set ce!!s0 S%& -y dB.

- %f (AS1_S%& ) Pr_BS_S%&# * dB for threemeas$rements in a ro3 AS1 -ecomes thePrimary_BS

- %f (AS2_S%& ) Pr_BS_S%&# * dB for three

meas$rements in a ro3 AS2 -ecomes thePrimary_BS



Hard 0 ,oft H1 in "/%,

Cell 6

Cell 7

Cell 11

Cell 10





Parame%ers

UE speed 4 5 km6h and movin' amon' ce!!s.

- Soft handover 7hresho!d 4 dB

- 7raffic 4 12.2 k-ps- Path !oss 4 8ehic$!ar



Case 7











Case ;





Case 3



Case 3



Case <



Case <



A#erage U= Transm$ss$on

Po&er



Pa% =oss



A/gor$%m o* SHO



Re*eren,es

23 ,attari4 N+ 5an$alos4 5+ &$hvami4 H+Seam!ess handover -eteen 9:A and U;7S6ehicular %echnolo$y !onference4 7889 6%! 7889-,prin$ 7889 :### ;<th 6olume ;4 2=-2< /ay 78895a$e(s)>8; - 8? 6ol; @i$ital 1bject :dentifier 28228<36#%#!,78892<29?2

73 H. B$ddendick 4 . Alfle4 , Bur$er4 and 5 AertCSim$!ator for Performance Ana!ysis in U;7S <== etorks ith HS=PA

2;th :### :nternational ,ymposium on 5ersonal4 :ndoor and /obile adio !ommunications(5:/!) 78894 Barcelona (,pain)4 ,ept 7889

3 P. 9ert>4 Hoppe4 . Alfle4 H Buddendick4 and D/ Eandstorfer =ynamic Sim$!ator for the Ana!ysis of the Performance of 9?=;A &adio etorks9th!1,% 7= /!/-/eetin$ in Eisbon4 5ortu$al4 !1,% 7= %@(87)29?4 ,ept 7887

93 &. Hoppe4 . Alfle4 H Buddendick4 and D/ Eandstorfer<ast P!annin' of Efficient 9?=;A &adio etorks ;9th :### 6ehicular %echnolo$y !onference (6%!) 7882 - Dall4 &tlantic !ity (New Fersey4",&)4 1ctober 7882

;3 &. Hoppe4 H Buddendick4 . Alfle4 and D/ Eandstorfer=ynamic Sim$!ator for St$dyin' 9?=;A &adio etork Performance ;rd 6ehicular %echnolo$y !onference (6%!) 7882 - ,prin$4 hodos (.reece)4 /ay 7882

http://www.awe-communications.com/Staff/buddendick.html


http://www.ihf.uni-stuttgart.de/institut/mitarbeiter/wertz/index.html

http://www.ihf.uni-stuttgart.de/institut/mitarbeiter/wertz/index.html





Re*eren,esG3 Hun$-Hui Fuan+ !hin$-ao Huan$+

Adaptive U;7S Handover ?ontro! A!'orithm in 7hird @eneration9ire!ess Systems:nformation4 !ommunications and ,i$nal 5rocessin$4 788; Difth :nternational!onference on

8G-8< @ec 788; 5a$e(s)>G8= - G27=3 @anyan !hen+ Iiaofen$ Aan$+ #lhakeem4 &J+

Performance ana!ysis of U;7S handover ith the he!p of 9:AKuality of ,ervice in Hetero$eneous Aired3Aireless Networks4 788; ,econd:nternational !onference on77-79 &u$ 788; 5a$e(s)>? pp@i$ital 1bject :dentifier 28228<3K,H:N#788;97

?3 ichardson4 JA+

U;7S overvie#lectronics 0 !ommunication #n$ineerin$ Fournal

6olume 274 :ssue 4 Fune 7888 5a$e(s)>< - 288

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3g Handover Issues