在4G(LTE）網(wǎng)絡(luò)中針對載波聚合有許多不同的切換場景，其最簡捷的切換形式中切換只需幾步（PCC切換與SCC添加在同一個RRC連接重配置中完成）；
Case 1：切換前去除SCC—>PCC切換—>SCC添加
在此種場景下先將SCC去除，再進(jìn)行PCC的切換；再添加SCC;
Case 2：SCC去除和PCC切換同步進(jìn)行à添加SCC
2.1 切換命令（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
2.2 SCC重新添加（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 :切換前去除SCCàPCC切換和SCC添加同步進(jìn)行
Case 4：去除SCC,PCC切換，添加SCC
原文來自：[url]www.sharetechnote.com[/url]
整理：kangguoying20201130
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