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HO Process&Optimization

Feb 16, 2018

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    1 NOKIA HO Process&Optimization.PPT/ DATE / MPu

    Handover Process

    HO parameters and optimization reated toHO process in !"M net#or$

    No$ia Net#or$s

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    % NOKIA HO Process&Optimization.PPT/ DATE / MPu

    Handover Process 1/2

    Hando'er decisions( made )* ++ Mana,ement in -"( are )ased on temeasurement resuts reported )* te M" / -T"( parameter sets 0or eacce and a,oritms. Tar,et ce e'auation is aso one part o0 teando'er process. Hando'ers are tri,,ered o )* tresod comparisonor )* periodic comparison.

    Tar,et ce e'auation is made in ++ Mana,ement in -" and its purposeis to 2nd te )est ce 0or ando'er. Te e'auation on te pre0erred ist o0te tar,et ces is )ased on3

    Te radio in$ measurements Tresod comparison

    Te priorit* e'es o0 te nei,)ourin, ces

    Te oad o0 te nei,)ourin, ces #ic )eon, to te same -" as teser'in, ce.

    +4 e'e comparison 5 i0 it is needed

    Te -T" sends te ist o0 )est candidates to te -". 6irst te -"de2nes and seects tose ces( #ic meet te re7uirements 0or teradio in$ properties. ++ Mana,ement can ande up to 8% )estcandidates 0or tar,et ce e'auation.

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    8 NOKIA HO Process&Optimization.PPT/ DATE / MPu

    Handover Process 2/2

    -"

    Eq. 1or

    Eq. 1'

    Adj1..Adj2.

    Adj3.--------------------------------------------------------Adj32

    Adj1Adj3------------------Adjn

    Eq.2or

    Eq.2'

    Target Cell Evaluation

    Cell ranked according to priority/load

    Adj1Adj3-------Adji.

    oad in!or"ation!ro" t#e $$"anage"ent

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    9 NOKIA HO Process&Optimization.PPT/ DATE / MPu

    HO&PC Diagram

    %

    1

    2

    3

    &

    (

    )

    -11% -1% -1%% -* -*% -+ -+% -) -)% -( -(% - -%

    PcUpperThresholdQualUL/DL

    HoThresholdQualUL/DL

    Power decrease

    Power increase

    Noactionneeded

    Interference HoQuality Ho

    LevHo

    PcLevUpperThresholdLevUL/DL

    HoThresholdLevD

    PcLowerThresholdLevUL/DL

    HoThresholdInterferenceUL/DL

    PcLowerThresholdQualUL/DL

    HoThresholdLevUL (if diversity gain

    !"Lev#in$ell(n

    !"Lev%cc#in

    Power increase

  • 7/23/2019 HO Process&Optimization

    5/34: NOKIA HO Process&Optimization.PPT/ DATE / MPu

    Handover Priority

    Hando'er priorit*

    1. ;pin$ and do#nin$ Inter0erence%. ;pin$ 7uait*8. Do#nin$ 7uait*

    9. ;pin$ e'e:. Do#nin$ e'e. "o# mo'in, M"?. -etter ce i.e. Periodic cec$ @Po#er -ud,et HO or ;m)rea H

    1B. P3 Co#er 7uait*/e'e tresods @;C/DC11. P3 ;pper 7uait*/e'e tresods @;C/DC

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    6/34< NOKIA HO Process&Optimization.PPT/ DATE / MPu

    Handover Types 1/2

    Intra e HO

    Hando'er in same T+ )et#een dierent timesots ontroed )* -"

    Intra "ite HO Hando'er )et#een dierent sectors in same site ontroed )* -"

    Inter "ite HO Hando'er )et#een sectors o0 dierent sites ontroed )* -"

    Inter -" HO Hando'er )et#een sectors o0 dierent sites and dierent -"s ontroed )* M"

    Inter "*stem HO Hando'er )et#een t#o M"s ontroed )* M"

  • 7/23/2019 HO Process&Optimization

    7/34= NOKIA HO Process&Optimization.PPT/ DATE / MPu

    Handover Types 2/2

    target

    MSC 1

    MSC 2

    MSC controlled

    BSC 1

    outgoing

    intra

    cell inter BSC source

    BSC 2incoming

    intercell

    MSC controlled

  • 7/23/2019 HO Process&Optimization

    8/34> NOKIA HO Process&Optimization.PPT/ DATE / MPu

    Handover Syncroni!ation

    Site "

    Site B

    "*ncronised HO )et#een co-6 ces

    Nons*ncronised HO )et#een dierent sites

  • 7/23/2019 HO Process&Optimization

    9/34? NOKIA HO Process&Optimization.PPT/ DATE / MPu

    HO "lgorit#ms

    $%uation [email protected] r'(evMinCell)n* Ma4 @B( AA J msT'P+rMa')n* P P J dependin, on M" assmar$

    $%uation 2

    P-!T #oMarginPB,T)n* #ere

    P-!T J ))msT'P+rMa' msT'P+rMa')n**@AFG+CEFGDCGHO

    [email protected]

    @-tsT'P+rMa' -T"GTP+$%uation [email protected] ena-leHoMargin(evual J LP-!T #oMargin(ev/ual)n* #ereP-!T J @[email protected] [email protected]'P+rMa'-T"[email protected] A'era,ed recei'in, e'es o0 adacent ces

    AFG+CEFGDCGHO3 A'era,ed recei'in, e'e o0 ser'in, ce)tsT4P#rMa43 Transmittin, po#er e'e o0 ser'in, ce

  • 7/23/2019 HO Process&Optimization

    10/341B NOKIA HO Process&Optimization.PPT/ DATE / MPu

    Po+er Budget Handover 1/2 Tri,,er

    Periodic ec$ @ #oPeriodPB,T

    andidate "eection E7uation 1 &% used Priorit* and Coad onsidered

    T*pica* used )et#een ces o0 te same Ca*er

    Parameters Faue HOPeriodPB,T 0 3 S"CCH periods ena-leP+rBudgetHandover 4 / 5 r'(evMinCell)n* 110 67 dBm msT'P+rMa')n* 0 30 dBm #oMarginPB,T)n* 0 3 dBm

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    11 NOKIA HO Process&Optimization.PPT/ DATE / MPu

    Po+er Budget Handovers 2/2

    P-!T J @@msT'P+rMa' msT'P+rMa')n @AFG+CEFGDCGHOAFG+CEFGNEC

    @-tsT'P+rMa' -T"GTP+

    P-!T J @@[email protected]?B >[email protected]%d-m9%d-m J 1B d-

    1B d- < d- OK

    [email protected] r'(evMinCell)n* Ma4 @B( msT'P+rMa')n* msT'P+r

    >B d-m ?? d-m @8B d-m 8B d-m J ?? d-m

    1.

    %.

    AFG+CEFGDCGHO J ?B d-mmsT'P+rMa'J 8B d-m @J 1-tsT'P+rMa' J 9% d-m @J 1< -T"GTGP+ J 9% d-m J @1< #oMarginPB,T)n*J < d-

    "er'in, e3 -est Adacent e3

    [email protected] J >B d-mr'(evMinCell)n*J ?? d-mmsT'P+rMa')n*J 8B d-m @J 1-tsT'P+rMa'J 9% d-m @J 1<

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    1% NOKIA HO Process&Optimization.PPT/ DATE / MPu

    (evel Handover 1/2

    Tri,,erTresod omparison @ #oT#res#olds(ev8(/D()p' n'

    andidate "eection E7uation 1 used E7uation % used i0 ena-leHoMargin(evual J N E7uation % #it#oMargin(evused i0ena-leHoMargin(evual J L Priorit* and Coad onsidered #itin te same -"

    Parameters HOT#res#old(ev8(/D( 110 67 dBm

    p' 1 32 n' 1 32

    r'(evMinCell)n* 110 67 dBm msT'P+rMa')n* 0 30 dBm

    #oMargin(ev)n* 26 26 dB

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    18 NOKIA HO Process&Optimization.PPT/ DATE / MPu

    (evel Handover 2/2

    E7uations 1 and % are used i0 parameter ena-leHoMargin(evual is set QLesR

    % d-

    #oMargin(evJ 9 d-

    Tri,,er 0or Hando'er due to Ce'e

    A

    -

    J e - is not seected as candidate 0orHO due to e'e since %d- S 9 d-

    Tresod @Ce'?: d-m

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    19 NOKIA HO Process&Optimization.PPT/ DATE / MPu

    uality Handover 1/2

    Tri,,erTresod omparison @ #oT#res#oldsual8(/D()p' n'

    andidate "eection E7uation 1 used E7uation % used i0 ena-leHoMargin(evual J N E7uation % #it#oMarginualused i0ena-leHoMargin(evual J L Priorit* and Coad onsidered

    Parameters Faue HOT#res#oldual8(/D( 0 7

    p' 1 32 n' 1 32

    r'(evMinCell)n* 100 67 dBm msT'P+rMa')n* 0 30 dBm

    #oMarginual)n* 26 26 dB

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    1: NOKIA HO Process&Optimization.PPT/ DATE / MPu

    uality Handover 2/2

    E7uations 1 and % are used i0 parameter ena-leHoMargin(evual is set QLesR

    % d-

    #oMarginualJ B d-

    Tri,,er 0or Hando'er HO due to uait*

    A

    -

    J e - is seected as potentia candidate 0or HO due to uait* since % d- B d-

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    1< NOKIA HO Process&Optimization.PPT/ DATE / MPu

    Signal uality in ,SM

    + uait* @+;AC parameter

    +;AC casses B ... =,it error rate beforeall decoding/ correction

    $0A ean E$ E$ range

    cla 45 !ro"... to

    % %61& 7 %6241 %62+ %62 ... %6& 4

    2 %6) %6& ... %6+ 4

    3 1613 %6+ ... 16( 4

    & 262( 16( ... 362 4

    &63 362 ... (6& 4

    ( *6% (6& ... 126+ 4) 1+61 8 126+ 4

    ua,le ignal

    unua,le

    ignal

    good

    accepta,le

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    1= NOKIA HO Process&Optimization.PPT/ DATE / MPu

    Handover Due To 9nter:erence

    Tri,,er 3 Tresod omparisonTresod omparison 0or uait* @ #oT#res#oldsual8(/D()p' n'*

    Tresod omparison 0or Ce'e @ #oT#res#olds9nter:erence8(/D()p' n'* andidate "eection

    Priorit* 0or Intere / Intrace HO seected at -" independent* 0or ;C / DC Priorit* Intere HO

    uait* HO i0 an* candidate I0 not Intrae HO

    Priorit* Intrae HO

    Parameters Faue #oT#res#old9nter:erence8(/D( 110 67 dBm

    p' 1 32 n' 1 32

    ena-le9ntraHo9nter:8(/D( 4 / 5 #oPre:erenceOrder9nter:8(/D( 95T$; / 95T;"

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    1> NOKIA HO Process&Optimization.PPT/ DATE / MPu

    9mperative Handovers

    Imperati'e Hando'ers Hando'er due to Distance Order to empt* ce( 0rom NM" Directed +etr* or ID+ +apid 6ied Drop

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    1? NOKIA HO Process&Optimization.PPT/ DATE / MPu

    Handover Due To Distance

    Distance Process msDistanceBe#[email protected](1..

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    %B NOKIA HO Process&Optimization.PPT/ DATE / MPu

    Directed ;etry

    Directed +etr* Directed retr* is ando'er 0rom ser'in, ce "DH to an

    adacent ce TH durin, ca setup ;sed #en TH con,estion is disa)in, TH assi,nment Ena)ed )* parameter dr9n8se

    Parameters Faue dr9n8se 4 / 5

    D

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