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help me with call flow (or basic procedure) of X2 handover in CA environment.

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help me with call flow (or basic procedure) of X2 handover in CA environment.
posted Oct 22 by anonymous

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1 Answer

+2 votes

Hello there,source from sharetechnote :----
There can be many different scenario (combination) of Handover with Carrier Aggregation. I will start with the simplest case, but recently I am seeing various requirement to reduce the number of steps for Handover (e.g, PCC handover and adding SCC in a single RRC Connection Reconfiguration etc).

Case 1 : Remove SCC before Handover -> HO for PCC -> Add SCC

Probably one of the simplest case of scenario we can think of would be as follows (By 'the simplest case', I mean it is the simplest in logic (the easiest to understand/implement), it didn't mean that it is the simplest in terms of the number of protocol sequence. Actually, it requires the longest steps in terms of protocol sequence). As you see here, just PCC has been changed as final result of Handover. In this scenario, Network remove SCC first before Handover and perform PCC handover and then add SCC again.

enter image description here

Case 2 : Remove SCC and Handover for PCC in single step -> Add SCC

enter image description here
(2) RRC Connection Reconfiguration (for Handover to PCC2 and Release SCC1)

    c1: rrcConnectionReconfiguration (4)

        rrcConnectionReconfiguration

            rrc-TransactionIdentifier: 0

            criticalExtensions: c1 (0)

                c1: rrcConnectionReconfiguration-r8 (0)

                    rrcConnectionReconfiguration-r8

                        mobilityControlInfo

                            targetPhysCellId: 10 // Physical Cell ID of PCC2

                            carrierFreq

                                dl-CarrierFreq: 2300 // DL Channel Number of PCC2

                            carrierBandwidth

                                dl-Bandwidth: n50 // Bandwidth of PCC2

                            t304: ms1000 (5)

                            newUE-Identity: 1032 [bit length 16, 0001 0000  0011 0010 decimal value 4146]

                            radioResourceConfigCommon

                                prach-Config

                                    rootSequenceIndex: 64

                                    prach-ConfigInfo

                                        prach-ConfigIndex: 3

                                        ...0 .... highSpeedFlag: False

                                        zeroCorrelationZoneConfig: 2

                                        prach-FreqOffset: 19

                                pusch-ConfigCommon

                                    pusch-ConfigBasic

                                        n-SB: 1

                                        hoppingMode: interSubFrame (0)

                                        pusch-HoppingOffset: 0

                                        .0.. .... enable64QAM: False

                                    ul-ReferenceSignalsPUSCH

                                        ..0. .... groupHoppingEnabled: False

                                        groupAssignmentPUSCH: 0

                                        0... .... sequenceHoppingEnabled: False

                                        cyclicShift: 0

                                pucch-ConfigCommon

                                    deltaPUCCH-Shift: ds2 (1)

                                    nRB-CQI: 4

                                    nCS-AN: 6

                                    n1PUCCH-AN: 0

                                ul-CyclicPrefixLength: len1 (0)

                            rach-ConfigDedicated

                                ra-PreambleIndex: 63

                                ra-PRACH-MaskIndex: 0

                        radioResourceConfigDedicated

                            physicalConfigDedicated

                                pusch-ConfigDedicated

                                    betaOffset-ACK-Index: 9

                                    betaOffset-RI-Index: 6

                                    betaOffset-CQI-Index: 6

                                antennaInfo: explicitValue (0)

                                    explicitValue

                                        transmissionMode: tm1 (0)

                                        ue-TransmitAntennaSelection: release (0)

                                            release: NULL

                                schedulingRequestConfig: setup (1)

                                    setup

                                        sr-PUCCH-ResourceIndex: 41

                                        sr-ConfigIndex: 27

                                        dsr-TransMax: n32 (3)

                        securityConfigHO

                            handoverType: intraLTE (0)

                                intraLTE

                                    .... 0... keyChangeIndicator: False

                                    nextHopChainingCount: 0

                        nonCriticalExtension

                            nonCriticalExtension

                                nonCriticalExtension

                                    sCellToReleaseList-r10: 1 item

                                        Item 0

                                            SCellIndex-r10: 1 // Serving Cell Index of SCC1

(7) RRC Connection Reconfiguration (for adding SCC1)

   c1: rrcConnectionReconfiguration (4)

        rrcConnectionReconfiguration

            rrc-TransactionIdentifier: 0

            criticalExtensions: c1 (0)

                c1: rrcConnectionReconfiguration-r8 (0)

                    rrcConnectionReconfiguration-r8

                        radioResourceConfigDedicated

                            mac-MainConfig: explicitValue (0)

                                explicitValue

                                    timeAlignmentTimerDedicated: infinity (7)

                                    mac-MainConfig-v1020

                            physicalConfigDedicated

                                cqi-ReportConfig-r10

                                    cqi-ReportAperiodic-r10: release

                                    nomPDSCH-RS-EPRE-Offset: 0dB (0)

                                pucch-ConfigDedicated-v1020

                                    pucch-Format-r10: channelSelection-r10 (1)

                                        channelSelection-r10

                                            n1PUCCH-AN-CS-r10: setup (1)

                                                setup

                                                    n1PUCCH-AN-CS-List-r10: 2 items

                                                        Item 0

                                                            N1PUCCH-AN-CS-r10: 4 items

                                                                Item 0

                                                                    N1PUCCH-AN-CS-r10 item: 101

                                                                Item 1

                                                                    N1PUCCH-AN-CS-r10 item: 102

                                                                Item 2

                                                                    N1PUCCH-AN-CS-r10 item: 103

                                                                Item 3

                                                                    N1PUCCH-AN-CS-r10 item: 104

                                                        Item 1

                                                            N1PUCCH-AN-CS-r10: 4 items

                                                                Item 0

                                                                    N1PUCCH-AN-CS-r10 item: 105

                                                                Item 1

                                                                    N1PUCCH-AN-CS-r10 item: 106

                                                                Item 2

                                                                    N1PUCCH-AN-CS-r10 item: 107

                                                                Item 3

                                                                    N1PUCCH-AN-CS-r10 item: 108

                        nonCriticalExtension

                            nonCriticalExtension

                                nonCriticalExtension

                                    sCellToAddModList-r10: 1 item

                                        Item 0

                                            SCellToAddMod-r10

                                                sCellIndex-r10: 1

                                                cellIdentification-r10

                                                    physCellId-r10: 400

                                                    dl-CarrierFreq-r10: 5790

                                                radioResourceConfigCommonSCell-r10

                                                    nonUL-Configuration-r10

                                                        dl-Bandwidth-r10: n50 (3)

                                                        antennaInfoCommon-r10

                                                            antennaPortsCount: an1 (0)

                                                        phich-Config-r10

                                                            phich-Duration: normal (0)

                                                            phich-Resource: oneSixth (0)

                                                        pdsch-ConfigCommon-r10

                                                            referenceSignalPower: 18dBm

                                                            p-b: 1

                                                radioResourceConfigDedicatedSCell-r10

                                                    physicalConfigDedicatedSCell-r10

                                                        nonUL-Configuration-r10

                                                            antennaInfo-r10

                                                                transmissionMode-r10: tm1 (0)

                                                                ue-TransmitAntennaSelection: release (0)

                                                                    release: NULL

                                                            pdsch-ConfigDedicated-r10

                                                                p-a: dB0

Case 3 : Remove SCC before Handover -> Handover for PCC and Add SCC in a single step

enter image description here

Case 4 : Remove SCC , HO for PCC, Add SCC all in single step

Personally I haven't seen any real implementation for this case and haven't confirmed in 3GPP specification in detail, but just by logical point of view we can think of following scenario as well.

enter image description here

answer Oct 23 by Sivakumar.d
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