OWJ200106 WCDMA Handover Principal (With Comment) ISSUE1.0
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Transcript of OWJ200106 WCDMA Handover Principal (With Comment) ISSUE1.0
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Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
C!"AHandover#rinciples
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$oreword
hy mo%ile systems need handover&'t is decided %y the characters o( mo%ile system)
The mo%ility o( *+
The mo%ile system is composed %y cells which the
coverage a%ility is limited.
#roviding the continuous service in mo%ile system
is the %asic element in o-.
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/% ectives
*pon completion o( this course, you will %e a%le to) The %asic de1nitions o( Handover
The algorithms o( handover decision
The handover ow The parameters o( handover
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Contents1. Introduction of Handover
2. "easurement o( Handover
. The 4asic Handovers
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The #urpose o( Handover
#roviding the continuous service in mo%ile system is the%asic element in o-.
The load %alance) sharing the resource
The hierarchy divided %y speed and service) high
e ciency o( using resource
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The 4asic Concepts o(Handover
Active -et"onitored -et!etected set+vent reporting
+vent reporting to #eriodic reporting
#eriodic reporting7adio Lin8 97L:7adio Lin8 -et 97L-:Com%ination way)
ma;imum ratio com%inationselection com%ination
The so(t handover gainC#'CH-o(t handover, so(ter handover, hard handover
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'nter=system handover 9*"T- ?=@ -":
According to the purpose o( handover4ased on Coverage
4ased on Load 9/ptional:
4ased on mo%ility o( *+ 9/ptional:
4ased on -ervice 9/ptional:
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The Characters o( !i erentHandovers
'tem -o(t Handover Hard Handover
The num%ers o( 7L in
active set a(ter
handover
-everal /ne
'nterruption during
handover
Do Ees
The (re>uencies o(
cells
/nly happened in
'ntra=(re>uency
cells
Can %e happened in 'ntra=
(re>uency cells or 'nter=
(re>uency cells
Comparison %etween so(t handover and hard
handover)
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The Characters o( !i erentHandovers
Comparison %etween so(t handover and so(terhandover
!uring so(ter handover, the uplin8 signaling are com%ined
in Dode4 %y ma;imum ratio com%ination, %ut during so(thandover they are com%ined in 7DC %y selection
com%ination
Compare to later one, the ma;imum ration com%ination can
get more gain. -o the per(ormance o( ma;imum ration
com%ination is %etter
-ince so(ter handover is completed in Dode4, it do not
consume transport resource o( 'u%
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RNC
NodeB 2NodeB 1
-o(t Handover
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RNC (WFMR)
NodeB
-o(ter Handover
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Hard Handover
RNC
NodeB 2NodeB 1
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Three -teps o( Handover
Decision
Execute
Measurement
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uestions
The di erences among -o(t handover, so(terhandover and hard handover
Typical application scenarios
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ContentsG. 'ntroduction o( Handover2. Measurement of Handover
. The 4asic Handovers
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Measurement Control, normal case
UE UTR N
ME !UREMENT C"NTR"#
"easurement Control
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"easurement Control
Measurement Control, normal case
UE UTR N
ME !UREMENT C"NTR"#
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Measurement Control, normal case
UE UTR N
ME !UREMENT RE$"RT
"easurement 7eport
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Contents2. "easurement o( Handover
2.G "easurement control and measurement report
2.2 The basic de nitions of measurement
2. "easurement event2.3 Compressed mode
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"easurement "odel
#a%er 1&ilterin'
#a%er &ilterin' E aluation
o& re*ortin'criteria
DB C
C+
*arameters *arameters
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7eporting Criterion
),2/(10)1(1010 11
a Best
N
ii New H R LogM W M Log W LogM
A
++
=
),2/(10)1(1010 11
a Best
N
ii New H R LogM W M Log W LogM
A
+
=
7eporting Criterion !ecision (ormula) (or e;ample, GA event )
#ath Loss
/ther measurement
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Iey #arameters
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Contents2. "easurement o( Handover
2.G "easurement control and measurement report
2.2 The %asic de1nitions o( measurement
2.3 Measurement event2.3 Compressed mode
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'nter=(re>uency "easurement+vents
'nter=(re>uency measurement events are identi1edwith 2J
24 ) The estimated >uality value o( the used (re>uencyis lower than a certain threshold, and that o( the non=used (re>uency is higher than a certain thresholdK
2C ) The estimated >uality value o( the non=used(re>uency is higher than a certain thresholdK
2! ) The estimated >uality value o( the used (re>uencyis lower than a certain threshold
2$ ) The estimated >uality value o( the used (re>uencyis higher than a certain threshold
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'nter=system "easurement+vents
'nter=system measurement events are identi1ed withJ
A ) The estimated >uality value o( the used *T7AD
(re>uency is lower than a certain threshold, and that o(
the other system is higher than a certain threshold
C ) The estimated >uality value o( the other system is
higher than a certain threshold
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The #urpose o( Compressedmode
#urpose"easure the inter=(re>uency cell or inter=system cell
under $!! mode
Categories
!ownlin8 compressed
*plin8 compressed
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The reali ation "ethods o(
Compressed mode7eali ation "ethods-$ 2
7ate matching puncturing
Higher layer scheduling
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uestions
How many events are there in intra=(re>uencymeasurement& hat are they&
How many events are there in *+ internal
measurement&
How many events are there in inter=(re>uency
measurement& hat are they&
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-ummary
This chapter covers intra=(re>uency measurement,inter=(re>uency measurement, inter=systemmeasurement and *+ internal measurement (romtheir de1nitions and application scenarios
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Contents
G. 'ntroduction o( Handover2. "easurement o( Handover
3. The Basic Handovers
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4rie( 'ntroduction o( -o(tHandover
Advantages-o(t handover gain
Load %alance
!ecrease the possi%ility o( call drop caused %y ping=pong
handover
!isadvantages
"ore resource needed in downlin8, especially (or the code
resource o( 4+ service
*sually, the gain o( downlin8 power is negative
hen the downlin8 power (rom di erent cells is not %alanced,
it will %ring side=e ect
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"easurement o( -o(t Handover
The measurement o( so(t handover so(ter handover "easurement value C#'CH 7-C# C#'CH
+c Do #athloss
#rocess o( "easurement Layer G 1lter, Layer 1lter
7eporting way
#eriodic reporting
+vent reporting
M +vent type GA G4 GC G! G$
M *+ measures the time di erence %etween C$D and -$D
M 7eporting rules) trigger condition, 7elative threshold, A%solute
threshold, Hysteresis, Time to trigger
+vent reporting to periodic reporting
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The !ecision Algorithm o( -o(tHandover
-o(t so(ter handover decisionGA ) 7adio Lin8 Addition
G4 ) 7adio Lin8 7emoval
GC ) Com%ined 7adio Lin8 Addition and 7emovalG! ) change %est cell
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The +;ecution o( -o(tHandover
-o(t handover e;ecution The update principal o( measurement control
Con1gure the neigh%or cells and the parametersaccording to %est cell
7LC modeA" mode is used (or measurement control
*" mode is used (or measurement report
The compensation and restriction o( so(t handover
$rom event reporting to periodic reporting
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-o(t Handover $low 9add 7L:
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Iey #arameters
7elative threshold Time to trigger
Layer 1lter coe cient
A%solute threshold o( so(t handover
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Contents
. The 4asic Handovers.G -o(t Handover
3.2 Intra!fre"uenc# Hard Handover
. 'nter=(re>uency Hard Handover
.3 'nter=system Hard Handover
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Hard HandoverCharacters*+ only has one 7L with one cell in the process o( handover!isconnect *+ with the original cell, then hand it over to target cell
The wor8ing (re>uency o( source cell and target cell are same
Advantages
+nhance the using e ciency o( the /N-$ code and hardwareresource
!isadvantagesHigh call drop possi%ility %ecause o( the intra=(re>uencyinter(erence
Application scenariosithout 'ur inter(ace %etween two 7DCs or the 'ur inter(ace am9only happened in inter=7DC handover:
The di erent strategies can %e used (or di erent conditions, suchas code resource condition, the o- condition and so no
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The "easurement, !ecision and+;ecution o( 'ntra=(re>uency HardHandover"easurement-imilar to so(t handover
!ecisionG! event
+;ecution*+ reports C$D=-$D in(ormation
-ynchroni ation hard handover*se the original !/$$ valueContinuous C$D
*+ does not report C$D=-$D in(ormation The hard handover %ased on timing7e=con1gure !/$$Calculate C$D according to !/$$
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Iey #arameters
Handover decision threshold %ased on 4+ speed*+ should do so(t handover when the speed o( 4+
service is less than the threshold.
*+ should do intra=(re>uency hard handover when the
speed o( 4+ service is greater than the threshold.
The parameters a%out G! event
Time to trigger, hysteresis
The parameters should %e set accord with the os
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Contents
. The 4asic Handovers.G -o(t Handover
.2 'ntra=(re>uency Hard Handover
3.3 Inter!fre"uenc# Hard Handover.3 'nter=system Hard Handover
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The 4rie( 'ntroduction o( 'nter=
(re>uency Hard HandoverCharacters The wor8ing (re>uency is di erent a(ter handover
The compressed mode needed i( the *+ only has onereceiver
*sually, the timing re=initiation hard handover is used(or hard handover
Application scenarios!isconnected coverage
Handover %ased on load
Hierarchy cells
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"easurement Nalues and+vents
The 'nter=(re>uency hard handover measurementvalues
"easurement values
C#'CH 7-C# C#'CH +c D0
!i erent handover purpose (or di erent measurement
type
'n the edge o( carrier coverage) C#'CH 7-C#
'n the center o( carrier coverage) C#'CH +c Do
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Compressed "ode 'nitiation
Conditions (or measurement initiated2! event ) The estimated >uality value o( the used
(re>uency is lower than a certain threshold
Conditions (or "easurement stopping
2$ event ) The estimated >uality value o( the used
(re>uency is higher than a certain threshold
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The coverage triggers the handover
24 event
Mthe >uality in the used (re>uency is lower than a%solute
threshold, %ut the >uality in another non=used (re>uency is
higher than another a%solute threshold.
The load triggers handover
2C eventMthe >uality in another (re>uency is higher than an a%solute
threshold
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Iey #arameters 9'':
'nter=(re>uency handover parameters caused %ynon=coverage a%ility
'nter=(re>uency measurement layer 1lter coe cient,
delay trigger time and hysteresis
'nter=(re>uency handover %ased on non=coverage
a%ility
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Contents
. The 4asic Handovers.G -o(t Handover
.2 'ntra=(re>uency Hard Handover
. 'nter=(re>uency Hard Handover
3.4 Inter!s#stem Hard Handover
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The 4rie( 'ntroduction o( 'nter=
system Hard HandoverApplication scenariosC!"A $!! ? @ -"
Characters!i erent radio access technology is used a(ter handover*sually, compressed mode should %e used to help themeasurement
Advantages$or coverage, it can solve the pro%lems (rom one system toanother system$or capacity, it can enhance the utili ing e ciency o( olde>uipments92 =@ :
!isadvantages The ow is complicated, and it demands highercompati%ility (or e>uipments!emands more complicated *+
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Compressed "ode'nitiated The inter=system measurement 9 -" measurement:"easurement type)
-" Carrier 7--'
4-'C 'denti1cation
4-'C 7econ1rmation
The process o( measurement) layer G 1lter, layer
1lter
"easurement reporting
+vent reporting
M2! +vent) initiate -" measurement
M2$ +vent) stop -" measurement
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!ecision Algorithm'nter=system handover caused %y coverage
+vent reporting)
A event The estimated >uality value o( the used *T7AD
(re>uency is lower than a certain threshold, and that o( the
other system is higher than a certain threshold
#eriodic reporting)
+valuation According to the periodic reported -" 7--'
measurement value and the 4-'C con1rming state o( target
cell o( -" system, and meanwhile the *+ evaluates the
-" 7--' o( target cell is greater than the a%solute
threshold, then consider the cell con1rmed %y 4-'C
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!ecisionAlgorithm
'nter=system handover caused %y non=coverage+vent reporting
C event) The estimated >uality value o( the other
system is higher than a a%solute threshold
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