Handover Algorithm and Parameters

7/23/2019 Handover Algorithm and Parameters

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Handover Algorithm and Parameters



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!"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




!"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*




!"ge 5

Classification of Handovers (continued*




!"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




!"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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+) Preprocessin!

Penalty Processin!


HO -ud!ment

HO .mplementation


/

0

1

2

3



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Penalty Processin!




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.




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*




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




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*




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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+) Preprocessin!

Penalty Processin!


HO -ud!ment

HO .mplementation


/

0

1

2

3



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)ankin! Processin!




=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*.




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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+) Preprocessin!

Penalty Processin!


HO -ud!ment

HO .mplementation


/

0

1

2

3




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




'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




HO -ud!ment

'irect )etry

No '8 +) HO

B HO

)><8evel<'rop HO

% HO


.nterference HO

Concentric Cell HO

%+) HO

8oad HO

Ed!e HO

+S 9ast +ovin! HO

8ayer HO

PBJ HO


N o r m a l H O




No '8 +) HO




% HO



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.nterference HO



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)> 8evel 'rop HO

Rx Level DropFormula




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


.nterference HO

Concentric Cell HO

%+) HO

8oad HO

Ed!e HO

+S 9ast +ovin! HO

8ayer HO

PBJ HO


N o r m a l H O








HO -ud!ment

'irect )etry

No '8 +) HO

B HO

)><8evel<'rop HO

% HO


.nterference HO

Concentric Cell HO

%+) HO

8oad HO

Ed!e HO

+S 9ast +ovin! HO

8ayer HO

PBJ HO


N o r m a l H O




8oad HO




HO -ud!ment

'irect )etry

No '8 +) HO

B HO

)><8evel<'rop HO

% HO


.nterference HO

Concentric Cell HO

%+) HO

8oad HO

Ed!e HO

+S 9ast +ovin! HO

8ayer HO

PBJ HO


N o r m a l H O




Ed!e HO




+S 9ast +ovin! HO




8ayer HO




PBJ HO




Concentric Cell HO

Normal

)>8evel )>ual %

Enhanced

)>8evel )>ual % 8oad




Concentric Cell HO




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




%+) HO






+) Preprocessin!

Penalty Processin!


HO -ud!ment

HO .mplementation


/

0

1

2

3




Handover .mplementation

=8 E>pected 8evel

at HO %ccess




Comparison with Handover %l!orithm 0

No '8 +) HO

B HO

)><8evel<'rop HO

% 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





)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





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





.nterference HO in HO %l!orithm 0 .ntra6Cell HO




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




+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




+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




Case Studies




Case Study/: Handover (80* )e6Esta"lishment 9eature

Err .ndication

+S BS BSC

HO Command

.nitiatin! HO

)e6esta"lishment

Est )e7uest

Est Confirmed

S%B+

=%




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




Case Study 1: O8,=8 raffic Shiftin!

%ssi!n Optimum

8ayer

%ssi!n6optimum6

level hreshold

O to = HO

hreshold

= to O HO

hreshold




Case Study 2: No Handover %ttempts in /st ier Nei!h"ors




Case Study 2: No Handover %ttempts in /st ier Nei!h"ors



+0a"@ You

Handover Algorithm and Parameters

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