文章目录[隐藏]
UE测量上报RSRP之后，由网络侧决定UE是否切换。
做这个决定的过程就是切换算法了，主要涉及到两个方面：（1）测量的量（2）测量方法。
如果简单地通过某个时刻变量的大小就决定是否切换，似乎不是一个符合实际的办法。因为实际上，网络和信号质量变化很快，也不稳定，所有需要测量不同的量和连续性来判断是否切换。
在RRC消息中，关于测量配置的关键字有：
在38.331/36.331中第五章有介绍测量事件的类型。
那么事件的触发在于测量的信号是否超过了某一门限。
有的时候网络信号有波动性，但是网络并不是特别care这样的小范围的波动性，只有累计到达一定程度的时候才会引起网络的主意，所有引用hysterisis来解决这一问题。
一个例子
基站配置给UE的测量RRC消息如下：
DL-DCCH-Message ::= { message: c1: rrcConnectionReconfiguration: RRCConnectionReconfiguration ::= { rrc-TransactionIdentifier: 3 criticalExtensions: c1: rrcConnectionReconfiguration-r8: RRCConnectionReconfiguration-r8-IEs ::= { measConfig: MeasConfig ::= { measObjectToAddModList: MeasObjectToAddModList ::= { MeasObjectToAddMod ::= { measObjectId: 1 measObject: measObjectEUTRA: MeasObjectEUTRA ::= { carrierFreq: 1300 allowedMeasBandwidth: 3 (mbw50) presenceAntennaPort1: FALSE neighCellConfig: '01' offsetFreq: 15 (dB0) cellsToAddModList: CellsToAddModList ::= { CellsToAddMod ::= { cellIndex: 1 physCellId: 290 cellIndividualOffset: 15 (dB0) } } } } } reportConfigToAddModList: ReportConfigToAddModList ::= { ReportConfigToAddMod ::= { reportConfigId: 1 reportConfig: reportConfigEUTRA: ReportConfigEUTRA ::= { triggerType: event: event ::= { eventId: eventA3: eventA3 ::= { a3-Offset: 2 reportOnLeave: FALSE } hysteresis: 2 timeToTrigger: 8 (ms320) } triggerQuantity: 0 (rsrp) reportQuantity: 0 (sameAsTriggerQuantity) maxReportCells: 4 reportInterval: 1 (ms240) reportAmount: 7 (infinity) reportconfigeutra-ext1: reportconfigeutra-ext1 ::= { reportAddNeighMeas-r10: 0 (setup) } } } ReportConfigToAddMod ::= { reportConfigId: 2 reportConfig: reportConfigEUTRA: ReportConfigEUTRA ::= { triggerType: event: event ::= { eventId: eventA3: eventA3 ::= { a3-Offset: -20 reportOnLeave: TRUE } hysteresis: 4 timeToTrigger: 11 (ms640) } triggerQuantity: 0 (rsrp) reportQuantity: 1 (both) maxReportCells: 8 reportInterval: 6 (ms5120) reportAmount: 7 (infinity) reportconfigeutra-ext1: reportconfigeutra-ext1 ::= { reportAddNeighMeas-r10: 0 (setup) } } } ReportConfigToAddMod ::= { reportConfigId: 3 reportConfig: reportConfigEUTRA: ReportConfigEUTRA ::= { triggerType: event: event ::= { eventId: eventA1: eventA1 ::= { a1-Threshold: threshold-RSRP: 37 } hysteresis: 2 timeToTrigger: 11 (ms640) } triggerQuantity: 0 (rsrp) reportQuantity: 1 (both) maxReportCells: 1 reportInterval: 2 (ms480) reportAmount: 0 (r1) } } ReportConfigToAddMod ::= { reportConfigId: 4 reportConfig: reportConfigEUTRA: ReportConfigEUTRA ::= { triggerType: event: event ::= { eventId: eventA2: eventA2 ::= { a2-Threshold: threshold-RSRP: 33 } hysteresis: 2 timeToTrigger: 11 (ms640) } triggerQuantity: 0 (rsrp) reportQuantity: 1 (both) maxReportCells: 1 reportInterval: 2 (ms480) reportAmount: 0 (r1) } } ReportConfigToAddMod ::= { reportConfigId: 5 reportConfig: reportConfigEUTRA: ReportConfigEUTRA ::= { triggerType: event: event ::= { eventId: eventA1: eventA1 ::= { a1-Threshold: threshold-RSRP: 45 } hysteresis: 2 timeToTrigger: 11 (ms640) } triggerQuantity: 0 (rsrp) reportQuantity: 1 (both) maxReportCells: 1 reportInterval: 2 (ms480) reportAmount: 0 (r1) } } ReportConfigToAddMod ::= { reportConfigId: 6 reportConfig: reportConfigEUTRA: ReportConfigEUTRA ::= { triggerType: event: event ::= { eventId: eventA2: eventA2 ::= { a2-Threshold: threshold-RSRP: 41 } hysteresis: 2 timeToTrigger: 11 (ms640) } triggerQuantity: 0 (rsrp) reportQuantity: 1 (both) maxReportCells: 1 reportInterval: 2 (ms480) reportAmount: 0 (r1) } } } measIdToAddModList: MeasIdToAddModList ::= { MeasIdToAddMod ::= { measId: 1 measObjectId: 1 reportConfigId: 1 } MeasIdToAddMod ::= { measId: 2 measObjectId: 1 reportConfigId: 2 } MeasIdToAddMod ::= { measId: 3 measObjectId: 1 reportConfigId: 3 } MeasIdToAddMod ::= { measId: 4 measObjectId: 1 reportConfigId: 4 } MeasIdToAddMod ::= { measId: 5 measObjectId: 1 reportConfigId: 5 } MeasIdToAddMod ::= { measId: 6 measObjectId: 1 reportConfigId: 6 } } quantityConfig: QuantityConfig ::= { quantityConfigEUTRA: QuantityConfigEUTRA ::= { filterCoefficientRSRP: 6 (fc6) filterCoefficientRSRQ: 6 (fc6) } } s-Measure: 0 speedStatePars: release: <present> } } } }
UE是这样上报测量结果的，因为有些测量条件没有满足，所有UE没有上报，如下：
UL-DCCH-Message ::= { message: c1: measurementReport: MeasurementReport ::= { criticalExtensions: c1: measurementReport-r8: MeasurementReport-r8-IEs ::= { measResults: MeasResults ::= { measId: 2 measResultPCell: measResultPCell ::= { rsrpResult: 21 rsrqResult: 10 } measResultNeighCells: measResultListEUTRA: MeasResultListEUTRA ::= { MeasResultEUTRA ::= { physCellId: 284 measResult: measResult ::= { rsrpResult: 20 rsrqResult: 17 } } } measresults-ext0: measresults-ext0 ::= { } measresults-ext1: measresults-ext1 ::= { measResultServFreqList-r10: MeasResultServFreqList-r10 ::= { MeasResultServFreq-r10 ::= { servFreqId-r10: 1 measResultSCell-r10: measResultSCell-r10 ::= { rsrpResultSCell-r10: 29 rsrqResultSCell-r10: 23 } } } } } } } } UL-DCCH-Message ::= { message: c1: measurementReport: MeasurementReport ::= { criticalExtensions: c1: measurementReport-r8: MeasurementReport-r8-IEs ::= { measResults: MeasResults ::= { measId: 4 measResultPCell: measResultPCell ::= { rsrpResult: 21 rsrqResult: 10 } measresults-ext0: measresults-ext0 ::= { } measresults-ext1: measresults-ext1 ::= { measResultServFreqList-r10: MeasResultServFreqList-r10 ::= { MeasResultServFreq-r10 ::= { servFreqId-r10: 1 measResultSCell-r10: measResultSCell-r10 ::= { rsrpResultSCell-r10: 29 rsrqResultSCell-r10: 23 } } } } } } } } UL-DCCH-Message ::= { message: c1: measurementReport: MeasurementReport ::= { criticalExtensions: c1: measurementReport-r8: MeasurementReport-r8-IEs ::= { measResults: MeasResults ::= { measId: 6 measResultPCell: measResultPCell ::= { rsrpResult: 21 rsrqResult: 10 } measresults-ext0: measresults-ext0 ::= { } measresults-ext1: measresults-ext1 ::= { measResultServFreqList-r10: MeasResultServFreqList-r10 ::= { MeasResultServFreq-r10 ::= { servFreqId-r10: 1 measResultSCell-r10: measResultSCell-r10 ::= { rsrpResultSCell-r10: 29 rsrqResultSCell-r10: 23 } } } } } } } }
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原文链接：https://blog.csdn.net/milkbusy/article/details/83011011
