C17 WCDMA RNO 3G2G HandOver and Roaming

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    3G2G HandOver and Roaming

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    Brief

    In Idle Mode , UE use cell reselection to enter GSM Network

    Connect Mode, UE use HandOver to enter GSM Network.

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    Cell Selection

    PLMN Selection

    1) when ue is power on , it scans RF and read MIB

    to define whether this cellsPLMN is what it wants.

    2) PLMN has order list .

    Auto Selection

    i) RPLMN

    ii) Home PLMN

    iii) User or Operator controlled PLMN selector with Access

    Technology

    Manual Selection

    Read SIB3 , Evaluate S Criteria

    IF matchs S Criteria , Camped on the cell ,then LA/RA update.

    Else

    read SIB11 finds neighbor cellsEvaluate S Criteria for neighbor cells

    if matched ,

    camped

    else

    scan other cells or in PLMN selection.

    end

    camped on any cell .

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    Cell Reselection

    All Neighbor Cell evaluate S criteria .

    In S>0 cells , Compute R value.

    Select Rmax Cell .

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    S & R Criteria

    Squal = Qqualmeas- Qqualmin

    Srxlev = Qrxlevmeas- Qrxlevmin - Pcompensation

    Squal > 0

    Srxlev > 0

    Rs = Qmap,s + Qhysts

    Rn = Qmap,n- Qoffsets,n- TOn* (1 - Ln)

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    Cell Selection &Reseletion Parameters(1)

    Qqualmin Value range: -24 -- 0 (dB)

    Content: Minimum required quality level corresponding to the CPICH Ec/No. UE can camp

    on the cell only when the CPICH Ec/No measured is larger than the value of this

    parameter.

    Recommended value: -18(dB).

    Qrxlevmin Value range: -58 -- -13. (dBm)

    Physical value range: -115 -- -25; step: 2 (-58: -115; -57:-113; ..., -13:25).

    Content: Minimum required RX level corresponding to the CPICH RSCP. UE can camp on

    the cell only when the measured CPICH RSCP is larger than the value of this parameter..Recommended value: -58.

    Qqualmeas Measured cell quality value. The quality of the received signal expressed in CPICH Ec/N0 (dB) for FDD cells.

    Not applicable for TDD cells or GSM cells.

    Qrxlevmeas Measured cell RX level value. This is received signal, CPICH RSCP for FDD cells (dBm), P-CCPCH RSCP for

    TDD cells (dBm) and RXLEV for GSM cells (dBm).

    Pcompensation Max(UE_TXPWR_MAX_RACH P_MAX, 0) (dB)

    Pmax Value range: -50 -- 33 (dBm)

    Content: Allowed maximum power transmitted on RACH in the cell. It is related to network

    planning.

    Recommended value: 24.

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    Cell Selection &Reseletion Parameters(2)

    TreselectiontimeValue range: 0~31 Physical unit: second.

    Content: If the signal quality of a neighbor cell is better than the serving cell during the

    specified time of this parameter, the UE will reselect the neighbor cell. It is used to avoid

    ping-pong reselection of UE between different cells. Note: 0 does not refer to 0 second but

    corresponds to the default value defined in the protocol.

    Recommended value: 0.

    Ssearch.RAT Value range: -16~10 Physical value range: -32 ~ 20; step: 2.

    Physical unit: dB.

    Content: Threshold for inter-RAT cell reselection. When the quality (CPICH Ec/No measured by UE)

    of the serving cell is lower than the threshold plus the minimum required quality ( Qqualmin) of thecell, the inter-RAT cell reselection procedure will be started. It's mandatory When the value of

    parameter SsearchratInd is TRUE.

    Recommended value: 2.

    Qhyst1s Value range: 0-20

    Physical value range: 0 40(dB); step: 2.

    Content: Hysteresis value for serving FDD cells in case the quality measure for cell

    selection and re-selection is set to CPICH RSCP. It changes with the slow-fading

    feature of the area where the cell is located. The bigger the slow-fading variance is,

    the bigger this value of the parameter.Recommended value: 2.

    Qhyst2s Value range: 0 - 20

    Physical value range: 040 (dB); step: 2.

    Content: Hysteresis value for serving FDD cells in case the quality measure for cell

    selection and re-selection is set to CPICH Ec/No. It changes with the slow-fading

    feature of the area where the cell is located. The bigger the slow-fading variance is,

    the bigger this value of this parameter.

    Recommended value: 1.

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    CELL Selection & Reselection MML COMMAND

    Cell Selection & Reselection Command

    1) MOD CELLSELRESEL

    2) MOD INTERRATNCELL

    3) MOD CELLMEAS

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    HandOver -CS_3G->2G1

    UE

    1. RRC Connect Req

    15. RAB Assign Req

    NODEB RNC3G MSC BSS2G MSC

    2. RRC Setup Complete

    3. Measure Control (measure ID 0x1 )

    4. Measure Control (measure ID 0x2 )

    5.Initial UE message(service request)

    6.DL DT (Authentication Request)

    7.UL DT (Authentication Response)8.Common ID

    9. Security Mode Command10. Security Mode Command

    11. Security Mode CMP12. Security Mode CMP

    13. UL DT(Setup)

    14. DL DT(Call proceeding)

    17.RL Recfg Ready

    21 RAB Assign Resp20 RB Setup Cmp

    19 RB Setup

    16.RL Recfg Prep

    18.RL Recfg Commit

    22. DL DT( Alerting )

    23. DL DT( Connect)

    24. UL DT(Connect Ack)

    26.RL Recfg Prep

    28 PhyCh Reconfig29.RL Recfg Comit

    27.RL Recfg Ready

    30 PhyCh Reconfig CMP

    31 Meaure Control(ID3 )

    32Measure Report 33 Relocation Required

    34 Relocation Command35. HandoverFromUtranCommand

    44 Iu Release Req

    46 RL Del Resp45 RL Del Req

    47 Iu Release Complete

    25 Measure Report(2D)

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    HandOver-CS_3G->2G2

    UE NODEB RNC 3G MSC BSS2G MSC

    35. BSSMAP Handover Request

    37. MAP/E Prepare

    Handover Response38. Relocation Commond

    39. HandoverFromUtranCommand

    41. Handover Complete

    33 Relocation Required

    44 Iu Release Command

    46 RL Del Resp

    45 RL Del Req

    47 Iu Release Complete

    34. MAP/E Prepare Handover

    36. BSSMAP Handover Request Ack

    40. BSSMAP Handover Detect

    42. BSSMAP Handover Complete43. MAP/E Send End Signal

    Required

    48. MAP/E Send End Signalresponse

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    Measurement Control ID3-CS_3G->2G4

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    Measurement Report ID3-CS_3G->2G5

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    HandOver&Relocation-CS_3G->2G5

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    Some Record Message-CS_3G->2G6

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    HandOver -CS_2G->3G

    UE NODEB RNC 3G MSC BSS2G MSC

    7. MAP/E Prepare

    Handover Response

    6. Relocation Request Ack

    12. Relocation Complete

    10 RL Restore Ind

    3 Relocation Request

    1.BSSMAP Handover Request

    2. MAP/E Prepare

    Handover

    4. Radio Link Setup

    5. Radio Link Setup RSP

    8. MAP/E Handover

    Command

    9. Handover to UTRAN Command

    11. Handover to UTRAN Complete

    16. MAP/E Send End signal

    response

    13. MAP/E Send End Signal

    request 14.BSSMAP Clear Command

    15.BSSMAP Clear CompleteUTRAN MobilityInfo

    UE Capability enquiry

    UTRAN MobilityInfo Confirm

    UE Capability Info

    UE Capability Info Confirm

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    UE NODEB RNC 3G SGSN 2G SGSN

    3.SGSN Context Request

    1 . Cell Change Order from UTRAN

    6. SGSN Context Ack

    2 Route Area Update Requeset

    9 Update PDP Context Request

    15 Iu Release Complete

    7 SRNS Data Forward Command

    10 Update GPRS location

    11. Cancel Location

    9.Update PDP Context Response

    11. Update GPRS location Ack

    InterSystem Change decision

    HandOver-PS_3G->2.5G

    . Measure Report

    GGSN HLR

    4.SRNS Context Request

    4.SRNS Context Responset

    5.SGSN Context Responset

    8 Forward Packet 8 Forward Packet

    12. Cancel Location

    12 Iu Release Command13 14 RL release

    12 Route Area Update Accept

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    Message-PS_3G->2.5G

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    RAT HandOver MML COMMAND

    Add GSM cell1

    MCC CELL ID GSMID

    MNC BSIC

    LAC BCCH ARFCN

    1 ADD GSMCELL: MCC="460", MNC="07", LAC="0001", CID="0011",

    NCC=1, BCC=3, BCCHARFCN=19,

    ANDIND=DCS1800_BAND_USED,RATCELLTYPE=GSM;

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    GSM cells Data2

    CGI : Cell Global Identification

    MCC | MNC | LAC | CI |

    Location Area Identification

    Cell Global Identification

    Identify unique GSM

    BSIC: Base Station Identify Code ,NCCBCC

    | NCC | BCC |

    3 bits

    3 bits

    MS can use it to distinguish cells with the same BCCH frequence

    Network can distinguish cells when received report

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    GSM cells Data3

    ARFCN : Absolute Radio Frequency Channel Number

    P-GSM 900 Fl(n)=890+0.2*n 1

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    RAT HandOver MML COMMAND

    4

    SET INTERFREQHO (Object RNC )

    MOD CELLINTERFREQHO (Object Cell)

    SET INTERRATHO (Object RNC)

    MOD CELLINTERRATHO (Object Cell)

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    RAT HandOver Parameters

    Tuse2d ( Pcpich Rscp dBm) : -95dBm

    CIO : 5dB

    Inter-RAT handover trigger time : 1s

    GsmRSSI Threshold : -95 dBm

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    Reference

    3GPP TS 25.304: "UE Procedures in Idle Mode and Procedures for Cell Reselection in

    Connected Mode".

    3GPP TS 25.331: "Radio Resource Control (RRC); protocol specification".

    3GPP TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".

    3GPP TS 03.03: "Digital cellular telecommunications system (Phase 2+); Numbering,

    addressing and identification"

    3GPP TS 05.05: "Digital cellular telecommunications system (Phase 2+); Radio

    transmission and reception".

    _

    Nokia 3G and GSM Roaming and Handover

    NOKIA

    WCDMAGSM

    WCDMAGSM_

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    Thank You !