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7/23/2019 Handover Algorithm and Parameters
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HUAWEI TECHNOLOGIES CO., LTD.
Handover Algorithm and Parameters
7/23/2019 Handover Algorithm and Parameters
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All Rights Reserved © HUAWEI TECHNOLOGIES CO., LTD. 200
!"ge 2
Purpose of Handover
#T$ %ee& 'Ret"i(")ilit*+ -$(ti($s -$//(i-"ti$( ith " /$vi(g 1S# T$ i/&r$ve (et$r% servi-e &er3$r/"(-e T$ red-e the -"ll dr$& r"te
T$ red-e the -$(gesti$( r"te
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!"ge 4
Classification of Handovers
By Synchronization By Network Elements
Synchronous HO: Source and ar!et cell "elon! same BS#
ar!et BS shall not send PH$ info messa!e#
%synchronous HO: Source and ar!et cell "elon! different
BS# ar!et BS shall send PH$ info messa!e#
By Channel
CH & CH
S'CCH & S'CCH
S'CCH & CH
('irected )etry*
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!"ge 5
Classification of Handovers (continued*
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!"ge 6
HO %l!orithm Process
+S !oes into 'edicated mode
+) Preprocessin!
Penalty Processin!
Basic,Secondary )ankin!
HO -ud!ment
HO .mplementation
+S is assi!ned new Physical Channel
/
0
1
2
3
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!"ge 7
+easurement )eport Preprocessin!
#U&li(% 1R i(-ldes &li(% re-eivi(g level "(d8"lit*.
# D$(li(% 1R i(-ldes d$(li(% re-eivi(g level,
d$(li(% re-eivi(g 8"lit* $3 the servi(g -ell "(d
$ther d$(li(% re-eivi(g levels 3r$/ the (eigh)$r
-ells.
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+easurement )eport Preprocessin! (continued*
The d$(li(% 1R is se(t t$ 9TS i( SACCH &li(%
# The i(terv"l is 5:0/s;&er ti/e he( 1S is $(
TCH.
# The i(terv"l is 50/s;&er ti/e he( 1S is $(
SDCCH.
/S%CCH
245ms
0S'CCH +ulti6frames
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+easurement )eport Preprocessin! (continued*
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+easurement )eport Preprocessin! 6 Parameters
+) Preprocessin!
($es,No*
ransfer Ori!inal +)
($es,No*
ransfer BS,+S Power class
($es,No*
Sent fre7 of Preprocessed
+)
BSC Preprocessin!
$es
$es
$es
No
%llowed +)
Num"er 8ost
9ilter 8en!th for
S'CCH 8evel
9ilter 8en!th for
CH ual
9ilter 8en!th for
CH 8evel
9ilter 8en!th for
S'CCH ual
9ilter 8en!th for
Ncell );<8evel
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HO %l!orithm Process
+S !oes into 'edicated mode
+) Preprocessin!
Penalty Processin!
Basic,Secondary )ankin!
HO -ud!ment
HO .mplementation
+S is assi!ned new Physical Channel
/
0
1
2
3
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Penalty Processin!
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Penalty for Handover 9ailure
# !(ish the t"rget -ell he( " HO 3"ils.
# This is t$ "v$id the 1S t$ sele-t this -ell "g"i( i(
(e>t HO ?dg/e(t.
Penalty 8evelafter HO 9ail
)scPenaltyimer
=mPenaltyimer Cf!Penaltyimer
Re"s$(s $3 H"(d$ver 3"ilre@
# Cell -$(gesti$(
# A /ess"ge i(di-"ti(g i(ter("l h"(d$ver re3s"l is
re-eived.
# A /ess"ge i(di-"ti(g U/ i(ter3"-e h"(d$ver 3"ilre
is re-eived dri(g $tg$i(g 9SC h"(d$ver.# A /ess"ge i(di-"ti(g U/ i(ter3"-e h"(d$ver 3"ilre
is re-eived dri(g i(ter("l h"(d$ver.
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Penalty for Emer!ency Handover
# !(ish the $rigi("l -ell he( "( e/erge(-* HO
de t$ 9 "(d TA $--rs. Penalty 8evelafter B HO
Penalty imeafter B HO (s*
Penalty 8evel
after % HO
Penalty ime
after % HO(s*
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Penalty for +S 9ast6+ovin! Handover
# Givi(g &e("lt* $( the $ther three l"*ersN$(B
/)rell" L"*er "3ter 1S h"(d$vers t$ U/)rell"
-ell )* 3"stB/$vi(gBHO.
# This is t$ %ee& 1S st"*i(g i( the /)rell" -ell
"(d "v$id 3re8e(t HO.
Penalty on +S9ast +ovin! HO
Penalty ime on
9ast +ovin! HO
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Penalty on Concentric Cell
# A (e -$(-e(tri- -ell HO is &r$hi)ited ithi( "
&e("lt* ti/e "3ter " -$(-e(tri- -ell HO 3"ilre. Penalty ime after =toO HO 9ails(s*
+a>)etry ime after
=toO 9ail
Penalty ime after
Oto= HO 9ails(s*
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Penalty on Enhanced Concentric Cell
# A (e U t$ O HO is &r$hi)ited ithi( " &e("lt*
ti/e "3ter " O t$ U HO is &er3$r/ed s--ess3ll*.
Penalty ime of
=toO HO(s*
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Penalty for .ntra6Cell HO
# A (e i(tr"B-ell HO is &r$hi)ited i3 it $--rs t$$
3re8e(tl*. +a> ConsecutiveHO imes
9or"idden imeafter +a> imes
.nterval for
Consecutive HO -ud#
Penalty ime
after %+)
CH96H HO 9ails(s*
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HO %l!orithm Process
+S !oes into 'edicated mode
+) Preprocessin!
Penalty Processin!
Basic,Secondary )ankin!
HO -ud!ment
HO .mplementation
+S is assi!ned new Physical Channel
/
0
1
2
3
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)ankin! Processin!
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=8)>8evel(n* & ?+in =8 Pwr
on HO candidate cell(n*@ A
+in %ccess lvl offset(s to n*
!"ge 20
+ )ule D )ule
Be!in
9inish to all
NCells
%n e>ternalBSC Ncell
Current channel S'CCH
'irected )etry.nter6BSC S'CCH
HO %llowed'elete Cell from list
Cell overloaded'8)>8evel(n* & ?+in '8 Pwr
on HO candidate cell(n*@ A
+in %ccess lvl offset(s to n*
'elete Cell from list
End $es
No
$es
No $es
No
$es
No
$es $es
$es
No
No No
Rle@
# A3ter the 1 rle , the servi(g -ell "(d -"(did"te (eigh)$r -ells "re
r"(%ed i( des-e(di(g $rder "--$rdi(g t$ the re-eivi(g level $(l*.
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Serv cell: '8)>lvl & .nter6layer HO hres
F .nter6layer HO HysG "it /2th is set to 5#
Ncell: '8)>lvl & .nter6layer HO hres
A .nter6layer HO HysG "it /2th is set to 5#
.f not metG "it /2 is set to /#
%t the same timeG "its 3 to /1 are turned off
!"ge 2=
/ Bits )ankin!
# A3ter (et$r% 3e"tre "d?st/e(t, "ll the
-"(did"te -ells h"ve their $( =7 )its v"le.
Best cell prioritized as per D )ule#
)an!e from 555 to //5
Ihen '8)>8vl(n* & '8)>8vl(s* A
.nter6cell HO hysteresisG "it 2th is set
to 5# OtherwiseG set to /# 9or source
it is set as 5#
Prioritize as per Hierarchical layers#
Each 2 layers / different prioritiesG
Hence total 2 different priorities
Servin! cell: if cell load & 8oad HO hreshG
"it //th is set to /# OtherwiseG set to 5
Ncell: if cell load & 8oad )ep# on Cand CellG
"it //th is set to /# OtherwiseG set to 5
Ihether share the same BSC or +SC
)eserved Bits
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HO %l!orithm Process
+S !oes into 'edicated mode
+) Preprocessin!
Penalty Processin!
Basic,Secondary )ankin!
HO -ud!ment
HO .mplementation
+S is assi!ned new Physical Channel
/
0
1
2
3
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HO -ud!ment
'irect )etry
No '8 +) HO
B HO
)><8evel<'rop HO
% HO
Enhanced 'ual Band HO
.nterference HO
Concentric Cell HO
%+) HO
8oad HO
Ed!e HO
+S 9ast +ovin! HO
8ayer HO
PBJ HO
E m e r ! e n c y H O
N o r m a l H O
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'irect )etry
Be!in
'irected )etry
Ena"led
Cell type Enhanced'ual Band
Enhanced
'ual Band direct
)etry ena"led
%SS8O%'-='JE
Ena"led
Cell load & Cell direct
retry for"idden
threshold&
Cell load e>ceeds
/55K
End
ri!!er Enhanced'irect retry
ri!!er 'irect retry
ri!!er %ssi!nmentProcedure
$es
No
$es
No
No
$es
No No
$es
$es
$esNo
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HO -ud!ment
'irect )etry
No '8 +) HO
B HO
)><8evel<'rop HO
% HO
Enhanced 'ual Band HO
.nterference HO
Concentric Cell HO
%+) HO
8oad HO
Ed!e HO
+S 9ast +ovin! HO
8ayer HO
PBJ HO
E m e r ! e n c y H O
N o r m a l H O
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No '8 +) HO
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% HO
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.nterference HO
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)> 8evel 'rop HO
Rx Level DropFormula
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B HO
9or %+) callG the 7uality threshold is '8,=8 ual# 8imit %+) 9),H)
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HO -ud!ment
'irect )etry
No '8 +) HO
B HO
)><8evel<'rop HO
% HO
Enhanced 'ual Band HO
.nterference HO
Concentric Cell HO
%+) HO
8oad HO
Ed!e HO
+S 9ast +ovin! HO
8ayer HO
PBJ HO
E m e r ! e n c y H O
N o r m a l H O
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Enhanced 'ual Band HO
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HO -ud!ment
'irect )etry
No '8 +) HO
B HO
)><8evel<'rop HO
% HO
Enhanced 'ual Band HO
.nterference HO
Concentric Cell HO
%+) HO
8oad HO
Ed!e HO
+S 9ast +ovin! HO
8ayer HO
PBJ HO
E m e r ! e n c y H O
N o r m a l H O
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8oad HO
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HO -ud!ment
'irect )etry
No '8 +) HO
B HO
)><8evel<'rop HO
% HO
Enhanced 'ual Band HO
.nterference HO
Concentric Cell HO
%+) HO
8oad HO
Ed!e HO
+S 9ast +ovin! HO
8ayer HO
PBJ HO
E m e r ! e n c y H O
N o r m a l H O
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Ed!e HO
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+S 9ast +ovin! HO
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8ayer HO
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PBJ HO
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Concentric Cell HO
Normal
)>8evel )>ual %
Enhanced
)>8evel )>ual % 8oad
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Concentric Cell HO
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Concentric Cell F Channel %ssi!nment Strate!ies
% pref# Of
.mme6%ssi!n %llowed
% hreshold of
.mme6%ssi!nment Pref
%ssi!n Optimum
8ayer
%ssi!n6optimum6
level hreshold
% hreshold
of %ssi!nment Pref
Pref# Su"cell in
HO of .ntra6BSC
.ncomin!6to6BSC
HO Optimum 8ayer
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%+) HO
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HO %l!orithm Process
+S !oes into 'edicated mode
+) Preprocessin!
Penalty Processin!
Basic,Secondary )ankin!
HO -ud!ment
HO .mplementation
+S is assi!ned new Physical Channel
/
0
1
2
3
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Handover .mplementation
=8 E>pected 8evel
at HO %ccess
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Comparison with Handover %l!orithm 0
No '8 +) HO
B HO
)><8evel<'rop HO
% HO
Enhanced 'ual Band HO
.nterference HO
Concentric Cell HO
%+) HO
8oad HO
Ed!e HO
+S 9ast +ovin! HO
8ayer HO
PBJ HO
Emer!ency HO Normal HO.ntra6Cell HO .nter6Cell HO
Better Cell HO
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Comparison with Handover %l!orithm 0
)ankin!
Emer!ency HO
Normal HO
Enhanced 'ual Band HO ,8oad HO
New PH$ Channelassi!ned
)ankin!
Emer!ency HO .ntra6Cell HO .nter6Cell HO
New PH$ Channel
assi!ned
HO %l!orithm / HO %l!orithm 0
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Comparison with Handover %l!orithm 0
Serv cell: '8)>lvl & .nter6layer HO hres
F .nter6layer HO HysG "it /2th is set to 5#
Ncell: '8)>lvl & .nter6layer HO hres
A .nter6layer HO HysG "it /2th is set to 5#
.f not metG "it /2 is set to /#
%t the same timeG "its 3 to /1 are turned off
Prioritize as per Hierarchical layers#
Each 2 layers / different prioritiesG
Hence total 2 different priorities
No 8ayer Handover in HO %l!orithm 0
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Comparison with Handover %l!orithm 0
.nterference HO in HO %l!orithm 0 .ntra6Cell HO
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Handover imers
imer Name 'efault Lalue (ms* 'escription
T =0000 Ti/er 3$r se(di(g $tg$i(g e>ter("l i(terB-ell h"(d$ver re8ests "(d h"(d$ver -$//"(ds
T: =0000 Ti/er 3$r r((i(g $tg$i(g e>ter("l i(terB-ell h"(d$ver -$//"(ds "(d h"(d$ver -$/&leti$( $r -le"r"(-e
T4=04 =0000r$/ the ti/e he( "( i(tr"B-ell $r i(terB-ell h"(d$ver -$//"(d is e>e-ted t$ the ti/e $3 "( i(tr"B-ell $r i(terB-ell h"(d$ver -$/&leti$(
T4=06 0Dri(g "( "s*(-hr$($s h"(d$ver, 3r$/ the ti/e he( the 9TS se(ds the 1S " &h*si-"l /ess"ge t$ the ti/ehe( the 9TS re-eives the set "s*(-hr$($s )"l"(-ed /$de SA91 3r$/ the 1S
T4=25 420Dri(g "( "s*(-hr$($s h"(d$ver, 3r$/ the ti/e he( the 1S se(ds the (et$r% " h"(d$ver "--ess 9rst/ess"ge t$ the ti/e he( the 1S re-eives " &h*si-"l /ess"ge 3r$/ the 9TS
+S BS/ BSC/ +SC BSC0 BS0 +S
+)s from +S (/* Handover )' (0* Handover )E (1*Channel %C (2*
Handover )E %CD (*Channel %C %CD (3*
Handover C+' (4*Handover C+' (M*
Handover 'etect (/5*
Handover %ccess
(*
PH$ .nfo (/0*
/st S%B+ (/1*
=% (/3*
Handover 'etect (//*
Esta"lish .N' (/2*
Handover C+P (/*Handover C+P (/4*
Clear C+' (/M*
Clear C+' (/*
1/51
M
4
1/02
1/53
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+aor Handover Parameters
Parameter Level Range of ValueDefaultValue
Location in Dump
Co. BSC/MSC Adj. Cell Level Yes, No Yes2G Cell Parameer
!xpor
Pe"al# Allo$ed Cell Level Yes, No No2G Cell Parameer
!xpor
Load %& Allo$ed Cell Level Yes, No No2G Cell Parameer
!xpor
MS Fas Mov'"( %& allo$ed Cell Level Yes, No No
2G Cell Parameer
!xpor
R)*Level*Drop %& Allo$ed Cell Level Yes, No No2G Cell Parameer
!xpor
PBG+ %& Allo$ed Cell Level Yes, No Yes2G Cell Parameer
!xpor
MS po$er pred''o" a-er %& Cell Level Yes, No Yes2G Cell Parameer
!xpor
MR Preproess'"( Cell Level Yes, No Yes2G Cell Parameer
!xpor
La#er o- Cell Cell Level s o 0 La#er 2"d/1rdLa#er 2G Cell Parameer!xpor
Cell Pr'or'# Cell Level o 2G Cell Parameer
!xpor
La#er %& +0res0old Cell Level 3 o 1 dB 242G Cell Parameer
!xpor
La#er %& %#seres's Cell Level 3 o 1 dB 12G Cell Parameer
!xporM'" DL Level o" Ca"d'dae
CellCell Level 3 o 1 dB 4
2G Cell Parameer!xpor
M'" 5L Level o" Ca"d'daeCell
Cell Level 3 o 1 dB 3 2G Cell Parameer!xpor
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+aor Handover Parameters
Parameter Level Range of ValueDefaultValue
Location in Dump
5L 7ual +0res0 Cell Level 3 o 83 32G Cell Parameer
!xpor
!d(e %& 5L R)*Level +0rs0. Cell Level 3 o 1 dB 42G Cell Parameer
!xpor
!d(e %& DL R)*Level +0rs0. Cell Level 3 o 1 dB 232G Cell Parameer
!xpor
!d(e %& 9a0 +'me Cell Level o se 42G Cell Parameer
!xpor
!d(e %& :al'd +'me Cell Level o se 2G Cell Parameer
!xpor
M'" Aess Level &;seNe'(06or
Level3 o 1 3 2G RNP !xpor
PBG+ %& +0res0Ne'(06or
Level3 o 1 < 2G RNP !xpor
="er>Cell %& %#seres'sNe'(06or
Level3 o 1 < 2G RNP !xpor
PBG+ 9a0 +'me Ne'(06orLevel o se 4 2G RNP !xpor
PBG+ :al'd +'meNe'(06or
Level o se 2G RNP !xpor
Ass'(" &p'mum La#er Cell LevelS#s&p, &verla'd, 5"derla'd,
"o"eS#s&p
2G Cell Parameer!xpor
Ass'(" &p'mum Level +0res0old
Cell Level 3 o 1 142G Cell Parameer
!xpor
5& 9a0 +'me Cell Level 3 o se 42G Cell Parameer
!xpor
5& :al'd +'me Cell Level 3 o se 2G Cell Parameer!xpor
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Case Studies
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Case Study/: Handover (80* )e6Esta"lishment 9eature
Err .ndication
+S BS BSC
HO Command
.nitiatin! HO
)e6esta"lishment
Est )e7uest
Est Confirmed
S%B+
=%
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Case Study 0: E>ternal .nterference
Curre" Proposed Curre" Proposed
Cell NameM'" 5L Level o"Ca"d'dae Cell
M'" 5L Level o"Ca"d'dae Cell
M'" DL Level o"Ca"d'dae Cell
M'" DL Level o"Ca"d'dae Cell
1282*="spe'o" Ba"(lo$ P1 A66oa6ad 3 23 4 24121*Ra' Gal' P1 Murree 3 23 4 24
1283*?ala Ba(0 P1 A66oa6ad 3 23 4 241214*?0a'ra Gal' P1 Murree 3 23 4 24
121*C0a"(la Gal' P1 Murree 3 23 4 24
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Case Study 1: O8,=8 raffic Shiftin!
%ssi!n Optimum
8ayer
%ssi!n6optimum6
level hreshold
O to = HO
hreshold
= to O HO
hreshold
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Case Study 2: No Handover %ttempts in /st ier Nei!h"ors
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Case Study 2: No Handover %ttempts in /st ier Nei!h"ors
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+0a"@ You