Handover Session

8/16/2019 Handover Session

http://slidepdf.com/reader/full/handover-session 1/44

GSM HandoverAlgorithm principles and KPI analysis

Prepared by Muhieddine Alqousi5/!/"# "



"$ Handover Algorithm principles

$ Hua%ei Handover &ypes

!$ Handover process 'o% and decision

ta(ing

)$ H*S+ KPI analysis

5$ H*S+ *ptimi,ation cases

ideas todiscuss

Prepared by Muhieddine Alqousi5/!/"#



• MS %ill Send the-. +lev o0Serving 1

2eighbors to3&S$• 3&S %ill

measure 4.+lev o0 Servingell

M+reporting

M+processi

ng

handover

decision

handover

eecution

'o%

Prepared by Muhieddine Alqousi5/!/"# !

• 3&S %ill processboth 4. and -.

M+s and Send theM+ +esults to 3S • 3ased onHandoverParameters

&hresholds and6quations thedecision %ill betriggered• &he 6ecution

phase %ill start bysending H*ommand to MS



Algorithms

Prepared by Muhieddine Alqousi5/!/"# )

"$ 3asic 7 advanced +an(ingand H* Penalty are done

be0ore emergency 7 normaland 0orced H*$$ 6dge H* is 2ormal type!$ Inter0erence handover can

be inter8cell or Intra8cell)$ Missing M+s Interpolation is

linear5$ Po%er +eduction per &+9a:ect H* area

"$ ;orced handover is donebe0ore H* penalty and parto0 advanced ran(ing76mergency handover isdone be0ore part o0advanced ran(ing

$ 6dge H* is 6mergency type$!$ Inter0erence Handover is

Intra8cell)$ Pbgt H* is replaced by

better8cell H*5$ Missing M+s Interpolationconsidered lo%est +qual$

H*&+.S<I&H=HandoverAlgo I

H*&+.S<I&H=HandoverAlgo II



"$ an be per0ormed at 3S Side or 3&S Side depending on

parameter 3&SM6S+P&P+6P+*.$ Interpolation in H* Algo I and H* Algo II has di:erentprocedures$

M+ Processing

Prepared by Muhieddine Alqousi5/!/"# 5

M+ Interpolation

I0 M+s are not issuedcontinuously and thenumber o0 lost M+s issmaller than the value o0

MRMISSCOUNT 7 thesystem per0ormsInterpolation$

M+ ;iltering

• &o accurately re'ect theradio environment o0 anet%or(7 ?ltering isper0ormed on the

measured values inseveral consecutivemeasurement reports$

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Interpolation

Prepared by Muhieddine Alqousi5/!/"# #

2o missing M+sno need 0or

interpolation

H* Algo IInterpolation

H* Algo IIInterpolation

" ! # 5

M+s Sent 0rom Mobile to 3&S

"

@#1"/

# 5

.inearInterpolation

"

B

# 5

<orst

Interpolation

Missing

Missing



"$ ;iltering is per0ormed on M+s obtained continuously 0rom theM+ list$

$ Averaging is per0ormed on uplin(/do%nlin( receive level7uplin(/do%nlin( receive quality7 &iming Advance @&A7 +adioCuality Indication @+CI7 3&S po%er7 neighboring G cell level$

!$ &he averaging minimi,es the e:ect on the result o0 handoverdecision due to sudden changes in the measurement values$

M+ ;iltering

Prepared by Muhieddine Alqousi5/!/"# B

Measurement Object Channel TypeParameter Current value

+eceive level o0 the serving cell S-H2SIGS&+;.&.62

has value in case A.G* II isactivated

+eceive level o0 the serving cell &H SS.62S- #Cuality o0 the serving cell S-H C.62SI

Cuality o0 the serving cell &H-A&AC4A;.&.62 )

&A o0 the serving cell &H &A;.&.62 ) &A o0 the serving cell S-H

&ASIGS&+;.&.62


+eceive level o0 the neighboringcell

3H26..;.&.62 )

+eceive level o0 the neighboringcell

S-H2SIGS&+;.&.62


Po%er o0 the 3&S in the serving

cell &H

-A&AS&+;.&.6

2 )+CI &H C.62S- #



M+ ;iltering

Prepared by Muhieddine Alqousi5/!/"# D

.inear ;iltering is used in both Algo I and Algo II

" ! # 5 # B # 5 " ! # 5 " ! # 5

Average ;iltering

) 5 # #



is &a(en in H* Algo

I

Prepared by Muhieddine Alqousi5/!/"# E

;orced

Handover

omprehensive +a(ing

6M6+G H*2ormal

Handover

H* Penalty

3asic+an(ing

.oadHandover

+an(ing based on load and priority o0 the cell

+an(ing based on +lev



is &a(en in H* Algo

II

Prepared by Muhieddine Alqousi5/!/"# "F

6M6+G H*

H* Penalty

.oadHandover

2ormalHandover

3asic

+an(ing

;orced H*

omprehensive +an(ing

;orced Handover can be eecuted %ithoutimposing H* Penalty in A.G* II

6mergency and .oad Handover based on 3asic

+an(ing only



"$ Penalty on the target cell %hen a H* 0ails$$ Penalty on the original serving cell %hen an emergency H*

@ base on 3C and &A is per0ormed$!$ Penalty on other high priority layer cells a0ter a 0ast movingH* is per0ormed$

)$ A ne% H* attempt is prohibited %ithin the penalty time a0teran over8laid/under8laid H* 0ails$

Penalty

Prepared by Muhieddine Alqousi5/!/"# ""

Handover Parameter Current valueCuic( handover &IM6P42ISH "F

Cuic( handoverH*P42ISHA.46 #!

&A Handover SS&AP42ISH #!

&A Handover &IM6&AP42ISH !F3C Handover SS3CP42ISH #!3C Handover &IM63CP42ISH "F

.oad handover @handover AlgoII

.*A-H*P62&IM6

used in H*Algo II

.oad handover @handover AlgoII

.*A-H*P62A

.46used in H*Algo II



+an(ing

Prepared by Muhieddine Alqousi5/!/"# "

• +an( the Serving and 2eighboring ells According to &heir +.ev$• 6clude 2eighbors %ith <ea( +9.ev$ I0 the do%nlin(/4plin( receivelevel o0 a neighboring G cell is smaller than the sum o0H*-MI2-<P<+/ H*-MI24<P<+ and MI2*;;S6&7 theneighboring cell should be removed 0rom the candidate cell list thatis7 the handover to this neighboring cell is prohibited$

• 6clude 2eighbors %hich are "FF .oaded

3asic +an(ing

• +e8+an( the neighbors according to the .ayer o0 the cell$• +e8+an( the 2eighbors According to the .oad on the &arget ell• +e8 +an( the 2eighbors based on Internal/6ternal 2eighborlassi?cation

•

In handover algorithm II7 the emergency handover decision is madebe0ore net%or( characteristics adJustment and 0orced handover anda0ter handover penalty @ecept load handover penalty and basicran(ing$ .oad handover penalty is per0ormed be0ore net%or(characteristics adJustment and a0ter an emergency handover$

Secondary +an(ing @2et%or( AdJustmentharacteristics

3 i + (i 6 l



•. +an( the Serving and 2eighboring ells According to &heir+.ev$

•. 6clude 2eighbors %ith <ea( +9.ev$ I0 the do%nlin(/4plin(

receive level o0 a neighboring G cell is smaller than the sumo0 H*-MI2-<P<+/ H*-MI24<P<+ and MI2*;;S6&7the neighboring cell should be removed 0rom the candidatecell list that is7 the handover to this neighboring cell isprohibited$

•.6clude 2eighbors %hich are "FF .oaded$

3asic +an(ing 6ample

Prepared by Muhieddine Alqousi5/!/"# "!

Object BCCH BSIC Rxlev Ran Serving "FF5 "" 8B5 F

!e"#hbor $ $%%& $' ()*2eighbor "FF! )5 8DE 2eighbor ! "FF 5# 8E5 !2eighbor ) "F! "B 8ED )

!e"#hbor * $%$% +' ($%&2eighbor # "FFE 5 8B# "

$'

%

6clusion o02eighborsloaded reached

"FF

6clusion o02eighbors %ea(erthanHOCDCMINDWPW

R

1

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•. +an( the neighbors according to the .ayer o0 the cell$•. +an( the 2eighbors based on Internal/6ternal 2eighbor

lassi?cation•. +an( the neighbors according to their load

omprehensive+an(ing 6ample

Prepared by Muhieddine Alqousi5/!/"# ")

Object BCCH BSIC Rxlev Ran

Serving "FF5 "" 8B5 "2eighbor "FF! )5 8DE F2eighbor ! "FF 5# 8E5 2eighbor ) "F! "B 8ED !

!e"#hbor , $%%- *' (&,

!e"#hbor /"thH"#her 0ayer1"ll jump

above the l"st

2xternal !e"#hbor 1"ll #odo1n "n the l"st "3 Co(BSCparameter "s O!



"#bit riterion

Prepared by Muhieddine Alqousi5/!/"# "5

Object BCCH BSIC Rxlev Ran $,b"t Cr"ter"onServing "FF5 "" 8B5 " FFFFFF""FFFFFFFF

2eighbor "FF! )5 8DE F FFFFFF"FFFFFFF"F2eighbor ! "FF 5# 8E5 FFFFFF""FFFFFF""2eighbor ) "F! "B 8ED ! FFFFFF""FFFFF"FF!e"#hbor , $%%- *' (&, %%%%$%$$%%%%%%%$

"#bit it i



•. A0ter the M rule 7 the serving cell and candidate neighborcells are ran(ed in descending order according to the

receiving level only•. 3oth the serving cell and the neighbor cells have their o%n

"#bits value$ &he smaller the value is7 the higher the priorityand position the cell is in the cell list$

•. &he "st8!rd bits bit value is decided according to the cell

signal level and the penalty process ta(ing place be0orehand$•. &he values come 0rom ma$ # candidate cells and " serving

cell according to the level ranges 0rom FFFL""F$ &he value0or the cell %ith the strongest signal level is FFF$

Page "#

16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

"#bit riterion

3asic +an(ing3its

&h )th bit d t i d b



•. &he )th bit bit value is determined by "nter(cell HO 4 o3 thesame layer 5 hysteres"s$

•.

&he )th bit o0 the serving cell is al%ays F7•. &he receiving signal level o0 the neighbor cell = &hereceiving level o0 the serving cell 1 Inter8cell H* @ o0 thesame layer hysteresis7 bit )th is set to F$

•. &he receiving level o0 the neighbor cell N &he receiving levelo0 the serving cell 1 Inter8cell H* @ o0 the same layer

hysteresis7 bit )th is set to "$•. 2ote In P3G& H*7 %hichever the greater o0 the inter8cell @ o0

the same layer hysteresis and PB6T threshold7 that value%ill be used in the P3G& H*$

Page "B

16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

&he )th bit determined byH* hysteresis

P3G& &hreshold

&he 5th "Fth bit determined



•. &he 5th8"Fth bits bit value is decided according to their

position in Hua%ei hierarchical net%or( structure$•. <hen the signal level o0 the neighbor cells or the serving cellis lo%er than the layer H* threshold and hysteresis7 this0unction is turned o: and all bits are set to F$

•. &hat is to say only %hen the above criterions are met7 thenthis 0unction ta(e e:ect$

•. Hua%ei cell layers can be divided into ) layers and each layercan be 0urther divided into "# di:erent priorities$ So there are#) di:erent priorities in Hua%ei hierarchical cell structure$

Page "D

16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

&he 5thO"Fth bit determinedby .ayer

ell Priority.ayer

&he ""th bit determined by



•. &he ""th bit bit value is decided by cell8load8sharingcriterion$

•. Serving cell i0 ell .oad= Start threshold o0 load H*7 bit""th is set to "7 other%ise is set to F$

•. 2eighbor cell i0 ell .oad=+eceive threshold o0 load H*7 bit""th is set to "7 other%ise is set to F$

•. +e0er to .oad H* &able 0or the load H* threshold and load

req$ on candidate cell$•. lue <hen the cell load is higher than the threshold7 then

the bit ""th is set to "$&his is done in order to put the cell in alo%er part o0 the cell list$

Page "E

16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

&he ""th bit determined by.oad threshold

.oad 3it

&he "th "!th bit determined



•. "th bit bit value is decided by co83S criterion$•. Serving cell is al%ays set to F$•. 2eighbor cell i0 co83S %ith the serving cell7 "th bit is set to

F7 other%ise is set to "$•. <hen the signal level 0rom the neighbor cell or the serving

cell is lo%er than layer H* threshold and hysteresis$ &his0unction is turned o: and the value is set to F$

•. I0 the parameter Qo83S/MS AdJ$R in the H* control table

is set to Q2oR7 then this 0unction is turned o: and the value isF$

•. "!th bit 3it value is decided by o8MS parameter7 havingthe same concept as the "th bit$

Page F

16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

&he "th8"!th bit determinedby o83S/o8MS

o83So8MS

&he ")th bit determined by



•. &he ")th bit .ayer H* threshold adJustment bit•. Serving cell criterion•. +eceive level = layer H* threshold layer H* hysteresis7 bit

")th is set to F$ I0 the above criterion is not met7 then bit ")this set to "$

Page "

16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

&he ")th bit determined by.ayer H*

.ayer H* &hreshold

&he "5th bit determined by



•. I0 the cell type is etended cell = this bit %ill be set to " tolo%er the ran(ing o0 the etended cells in the neighbor list

Page

16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

&he "5th bit determined by6tended ell &ype

6tended ell &ype

P/2 + l



P/2 +ule


• &he purpose o0 the P/2 rule to give a changeable parameters trade

o: bet%een the trigger speed and accuracy o0 certain handovertype• P is the number o0 measurements %hich satis0y the handover

trigger condition• 2 is the number o0 measurement under satis0action test

" ! # 5 # B # 5 " ! # 5 " ! # 5

Average ;iltering

) 5 # #• &rigger ondition

+Cual=#

# #

• 2=)

• P=

P/2 + l



P/2 +ule

Prepared by Muhieddine Alqousi5/!/"# )

smaller P and 2 values means 0aster decision but less accurate

MOParameter

I7Parameter !ame 8eature !ame

Recommended 9alue

GG26

.. .6S&A& .ayer H* <atch &ime

H4A<6I I Handover

H4A<6I IIHandover #

GG26..

.6.AS& .ayer H* alid &imeH4A<6I I Handover

H4A<6I IIHandover

)

GG26..

P3G&S&A& P3G& <atch &ime H4A<6I I Handover #

GG26..

P3G&.AS& P3G& alid &ime H4A<6I I Handover )

GG26..

H*S&A&I&IM6

Cuic( Handover Static &ime

;ast MoveHandover

)

GG26..

H*.AS&&IM6

Cuic( Handover .ast &ime

;ast MoveHandover

!

GG26.. 3CS&A&&IM6 3C H* <atch &ime H4A<6I IIHandover "


http://slidepdf.com/reader/full/handover-session 25/44Page 5

H* &ypes

• 3ad Cuality H*•

&A H*• Inter0erenceH*

• +.evel-ropH*

• 6dge H*• .ayer H*• P3G& H*

• ;ast moving

H*• *ver8laid/under8laidH*

• ;orced H*

2mer#ency HO !ormal Handover Spec"al HO Types

MO Parameter I7 Parameter !ameCurrentSett"n#

G6..H*3ASI H*&+.S<I&H urrent H* ontrol Algorithm H*A.G*+I&HM"G6..H*3ASI *3SMSA-T62 o83S/MS AdJ 2*G6..H*3ASI SIGHA2H*62 S-H H* Allo%ed 2*G6..H*3ASI I2&+A6..H*62 Intracell H* Allo%ed 2*G6..H*3ASI .*A-H*62 .oad Handover Support 2*G6..H*3ASI CKMH*62 MS ;ast Moving H* Allo%ed 2*G6..H*3ASI +9CK;A..H*62 +.evel-rop H* Allo%ed 2*G6..H*3ASI P3G&H*62 P3G& H* Allo%ed U6SG6..H*3ASI .6H*62 .evel H* Allo%ed U6SG6..H*3ASI ;+I2G6H*62 6dge H* Allo%ed U6SG6..H*3ASI 3CH*62 3C H* Allo%ed U6SG6..H*3ASI &AH*62 &A H* Allo%ed U6S

G6..H*3ASI *2H*62 oncentric ircles H* Allo%ed 2*G6..H*3ASI I2&6+;H*62 Inter0erence H* Allo%ed U6S

6mergency



• &he purpose o0 the emergency handover types is to rescuethe call 0rom drop or aggressive bad quality situations$

• I0 the trigger conditions 0or an emergency handover are metand there is at least one candidate cell7 the emergency

handover timer !2/:R6HOMI!I!T9 is started$ Anotheremergency handover decision can be per0ormed only %hen!2/:R6HOMI!I!T9 times out$

• A0ter the 6mer$ H* is success0ul7 the penalty is per0ormed

on the original cell$ -uring penalty time7 an o:set issubtracted 0rom the level o0 the original cell to prevent animmediate handover bac( to the original cell$

6mergencyHandover &ypes

Prepared by Muhieddine Alqousi5/!/"# #

Seconds



• I0 B;HO2! is set to Ues7 the trigger conditions 0or a 3C handover

are as 0ollo%s

• &he uplin( receive quality is greater than or equal to theuplin( receive quality threshold o0 the serving cell$

• &he do%nlin( receive quality is greater than or equal to thedo%nlin( receive quality threshold o0 the serving cell$

• target cell must meet the 0ollo%ing conditions

receive level o0 the target cell receive level o0 the servingcell 1 @I!T2RC200H<ST o0 the serving cell con?gured 0or theneighboring cell 8 #) 8 @B;M=R6I! 8 #)

3C Handover

Prepared by Muhieddine Alqousi5/!/"# B

<2S

&hreshold odec -ir alue-.C4A.IMI&AM+;+ ;+ -. #F4.C4A.IMI&AM+;+ ;+ 4. #F-.C4A.IMI&AM+H+H+ -. 554.C4A.IMI&AM+H+ H+ 4. 55

,),-

Inter0erence



• I0 I!T2R8HO2! is set to Ues7 the trigger conditions 0or aninter0erence handover are as 0ollo%s

• &he ?ltered value o0 4./-. receive quality is greater than orequal to the speci?ed receive quality threshold at the current4./-. receive level$

Inter0erenceHandover

Prepared by Muhieddine Alqousi5/!/"# D

<2S

Parameter!ame

Rx0evM"n

Rx0evMax

;ual"ty 3or !on=MR

;ual"ty 3or=MR

+9C4A." 8""F 8DF #F #5+9C4A. 8BE 8BE 5F 55+9C4A.! 8BD 8B5 )E 5)+9C4A.) 8B) 8B )D 5!+9C4A.5 8B" 8#E )B 5

+9C4A.# 8#D 8#5 )# 5"+9C4A.B 8#) 8# )5 5F+9C4A.D 8#" 85D )) )E+9C4A.E 85B 855 )! )D+9C4A."F 85) 85 ) )B+9C4A."" 85" 8)D )" )#

+9C4A." 8"F 8)B )F )5

-irected +etry



-irected +etryProcedure

Prepared by Muhieddine Alqousi5/!/"# E

hec( i0-irected +etry is

6nabled@-I+6&+U62=*

2

hec( i0Assignment

based on .oadis 6nabled

@ASS.*A-T4-G662=*2

In case o0 "FFell .oad 7

Assignment0ailure due to

ongestion

hec( i0 the cell.oad 6ceeded

the threshold-+&&+U;3-&H+6S

U6S

2*

In case o0 "FFell .oad 72ormal -+

Procedure %illbe triggered

2ormal -+procedure %ill

be triggered

U6S

-+ &arget ell



• &he target cell must have the highest priority in the

candidate cell list a0ter handover preprocessing$ In addition7the target cell must meet the 0ollo%ing conditions

• &he serving cell does not 0unction as a target cell$

• .oad o0 the candidate neighboring cells V 7T0O=7THR27• In handover algorithm II7 -o%nlin( receive level o0 the

neighboring cell a0ter ?ltering 8 -o%nlin( receive level o0 theserving cell a0ter po%er control compensation @WI!T2RC200H<STW 8 #) 8 @7RHO029R=!62 8 #)$

•In handover algorithm I7 receive level o0 neighboring cells XMI!P/R0297IRTR< $

-+ &arget ellSelection

Prepared by Muhieddine Alqousi5/!/"# !F

$,

,)

&'

)*



• &he purpose o0 this H* is to enhance H*S+ and -+ in 0ast moving

MSs in high%ays$• &%o methods the 3S use to (no% i0 mobile is moving 0ast

0requency *:set and quic( P3G&$• &he decision o0 quic( H* is ta(en 0aster than other types because

"$ .i0ting the restriction on the interval bet%een handoverdecisions

$ +educing the number o0 M+s 0or the handover decision!$ Introducing the alpha ?ltering

• I0 ;:IC>HO2! is set to Ues7 the trigger conditions 0or a quic(handover are as 0ollo%s

"$ &he MS is moving a%ay 0rom the serving cell @the0requency o:set in the measurement result is a negativevalue and the moving speed o0 the MS is greater thanMO92SP227THR2S$

$ &he ?ltered uplin( level o0 the serving cell is smaller thanHO:PTRI62$

!$ &he compensated do%nlin( level o0 the serving cell issmaller than HO7O/!TRI62$

)$ &he path loss o0 con?gured chain neighboring cells is

Cuic( H*

Prepared by Muhieddine Alqousi5/!/"# !"

+* *

%

!O

*%



• Cell 0oad HO Cr"ter"ons ?• System load o0 3S N Permissible load o0 H*

threshold• .oad o0 serving cell .oad H* threshold

• Re@u"rements 3or the tar#et cell• .oad o0 target cell N .oad H* threshold

• A handover band is de?ned in load handover7 in the range o0edge handover threshold L edge handover threshold 1 loadhandover band%idth$

• &he handover band itsel0 is divided into multiple equali,ed

handover step si,es7 MS @0alling %ithin edge handoverthreshold 1 2Yhandover step si,es are handover toadJacent cells one by one 0rom lo% to high$

• *nce load o0 the serving cell decreases @as lo%er than theload handover start threshold or load o0 the adJacent cellincreases to a certain etent @as higher than the load

.oad H*


.oad H*



.oad H*Parameters

Prepared by Muhieddine Alqousi5/!/"# !!

Parameter I7 Parameter !ameRecommended

9alue

SUS;.*<.6System ;lu &hreshold 0or .oad

H* "F

&+IG&H+6S .oad H* &hreshold EF

.oadAcc&hres.oad handover .oad Accept

&hreshold DF.*A-*;;S6& .oad H* 3and%idth 5

.*A-H*P6+I*- .oad H* Step Period "F.*A-H*S&6P .oad H* Step .evel 5

.*A-H*A- 6nhanced .oad H* Allo%ed 2*.AUH*.*A-&H Inter8.ayer H* .oad &hreshold F.*A-H*4S++A

&I*H* +atio o0 6nhanced .oad H*

Algorithm !.oadHo6n .oad Handover Support 2*

.*A-H*P62&IM

6 Penalty &ime on .oad H* "F.*A-H*P62A.

-i:erence bet%een -+ H* and



-i:erence bet%een -+ H* and.oad H*

Prepared by Muhieddine Alqousi5/!/"# !)

Mobile tried toaccess verynear ell but0ailed due tocongestion

all %ill bedirected to

another 0ar ell

Mobile tried toaccess verynear ell but

0ailed due tocongestion

Another MS onthe cell border%ill per0ormhandover dueto load

7R HO 0oad HO



Page !5

• 6dge H* riterion – In 2 seconds7 %hen there are P seconds

that neighbor cellZs -. or MSZs 4. signal

level is lo%er than the 6dge H*threshold$ &hen the criterion is met and6dge H* occurs$ &his method utili,esthe P/2 rule$

• +equirements 0or the target cell – &he target cell should be ran(ed in 0ront

o0 the serving cell$

6-G6 H*



Page !#

• .ayer H* criterions – Serving cell

• 2o requirement$

– &arget cell • .ayer o0 the target cell is lo%er than the serving

cell$

• +eceive level o0 the target cell layer cell

threshold 1 layer cell hysteresis$• &arget cell should be ran(ed in 0ront o0 the

serving cell$ &he priority o0 target cell should behigher than the serving cellZs$

.AU6+ H*

Multi8.ayer on?guration @HS



Multi .ayer on?guration @HS0eature

Prepared by 5/!/"# !B

$)%%

-%%Inter(0ayer

HO2762HO





Prepared by 5/!/"# !D

$)%%

Inter(0ayer

HO

2762HO





Prepared by 5/!/"# !E

$)%%

PB6THO

PB6THO

I t . H d



• Handover initiated because o0 di:erence in

.ayer even i0 neighbor +lev is %ea(er$• &riggering conditions• &his type o0 handover is enabled 7

.6H*62=U6S•

*ne o0 the neighbors cells has higherpriority than serving cells @higher priority8parameter .AU6+ has lo%er value$

• &arget ell +lev=H*&H+6S1

I2&6.6H*HUS&8#)• P/2 criteria 0or Inter8.ayer H* is satis?ed$P parameter .6.AS&=#2 parameter .6S&A&=)

• .oad on EFF cells eceed the threshold .AUH*.*A-&H

Inter8.ayer Handover

Prepared by 5/!/"# )F

I t . H d



Inter8.ayer Handover

Prepared by 5/!/"# )"

-%%

$)%%

EFF ell

Setting

.AU6+=!

.AUH*.*A-&H=F.6H*62=U6S

"DFF ell

Setting

.AU6+=H*&H+6S=5.6H*62=U6S

Per 2eighbor

I2&6.6H*HUS&=#B.6.AS&=#.6S&A&=)

-./4. 6dge



• 6dge Handover initiated because o0 bad

coverage in either 4. or -.• &riggering conditions

• &his type o0 handover is activated;+I2G6H*62=U6S$

• -. /4. +lev o0 "DFF cell is less than-.6-G6&H+6S/4.6-G6&H+6S$

• -. +lev o0 EFF cell is greater than @serving-l +lev 1I2&6+6..HUS& 8#)$

• P/2 criteria o0 6dge Handover is satis?edP parameter 6-G6.AS&"2 parameter 6-G6S&A&"

-./4. 6dgeHandover

Prepared by 5/!/"# )

-./4. 6dge



-./4. 6dgeHandover

Prepared by 5/!/"# )!

-%%

$)%%

EFF ell Setting"DFF ell Setting

;+I2G6H*62=U6S-.6-G6&H+6S=F4.6-G6&H+6S="

56-G6.AS&"=)6-G6S&A&"=#

Per neighbor

I2&6+6..HUS&=#B6-G6A-T.AS&&IM6=)6-G6A-TS&A&&IM6=#



P3G& H*

• P3G& H* riterions – &arget cellZs path loss is smaller than the serving

cellZs path loss by the P3G& threshold value$

– Satis0ying the P/2 rule$

– &arget cell should be ran(ed in 0ront o0 theserving cell$

• 2ote –

P3G& H* can only occur bet%een same8prioritycell$ I0 the system permits P3G& H* 0or the cell7P3G& H* can occur in either inter83S or inter8MS$

Handover Session

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Transcript of Handover Session