LTE切换事件
AB事件LE
LTE支持的切换事件有A类和B类，其中A类本用作系统内测量，B类被用作系统间测量A1事件：表示服务小区信号质量高于一定门限；A2事件：表示服务小区信号质量低于一定门限；A3事件：表示邻区质量高于服务小区质量，用于同频、异频的基于覆盖的切换；A4事件：表示邻区质量高于一定门限，用于基于负荷的切换，可用于负载均衡；A5事件：表示服务小区质量低于一定门限并且邻区质量高于一定门限，可用于负载均衡; 异系统测量事件：B1事件：邻小区质量高于一定门限，用于测量高优先级的异系统小区；B2事件：服务小区质量低于一定门限，并且邻小区质量高于一定门限，用于相同或较低优先级的异系统小区的测量。
LTE移动性参数(全局)最小接入电平基本信息参数功能该参数表示UE在该小区驻留需满足的最小接收电平门限。
该值取值范围是2G/3G接收电平的实际值，对于LTE/3G ,?实际的RxlevMin?等于SIB3/SIB6的IE value的两倍，调整步长为2dbm。
对于2G，实际的RxlevMin等于SIB7的?(IE value * 2)? ?115，调整步长为2dBm当UE测量到的2G/3G电平满足S准则时，UE才可能驻留在该小区。
参数调整影响调整该参数的门限值，会对小区的选择和驻留有所影响。
QrxLevMin如果设置过高，则UE将无法驻留到该小区。
高优先级重选门限基本信息参数功能当高优先级小区的S值在一定时间内高于该阀值(threshXHigh)后，UE可以重选到该小区。
参数调整影响调整该参数的门限值，会对小区的选择和驻留有所影响。
threshXhigh如果设置过高，?会增加UE重选到高优先级小区的难度。
低优先级重选门限基本信息参数功能当低优先级小区的S值在一定时间内高于该阀值(threshXLow)后，同时主服务小区的S值低于threshServingLow，UE可以重选到该低优先级小区。
参数调整影响调整该参数的门限值，会对小区的选择和驻留有所影响。
LTE系统事件简介
LTE系统事件简介一、LTE事件概述LTE切换时需要UE上报测量的结果（包括RSRP，RSRQ等），而上报又分为周期性上报和事件触发的上报。
➢周期性上报由基站配置，UE直接上报测量的结果。
➢事件触发的上报又分为系统内的事件和系统间的事件。
LTE系统内切换主要事件包括：➢A1事件，服务小区质量高于门限；这个事件可以用来关闭频间测量。
➢A2事件，服务小区质量低于门限；这个事件可以用来打开频间测量和系统间测量，因为这个事件发生后可能发生切换等操作。
➢A3事件，邻小区质量好于服务小区质量；这个事件一般用于频内/间基于覆盖的切换。
➢A4事件，邻小区质量好于门限；这个事件一般用于基于负荷的切换。
➢A5事件，服务小区质量低于一个门限并且邻小区质量高于一个门限；这个事件也可以用于频内/间基于覆盖的切换。
目前LTE同频切换都是基于A3/A5事件进行的切换（现网主要是基于A3事件的）二、切换流程举例三、切换流程简要说明- RRC Connection Reconfiguration（Measurement Control）测量控制，一般在初始接入或上一次切换命令中的重配消息里携带- Measurement Report测量报告，终端根据当前小区的测量控制信息，将符合切换门限的小区进行上报- HO Request源小区在收到测量报告后向目标小区申请资源及配置信息（站内切换的话为站内交互，站间切换会使用X2口或者S1口，优先使用X2口）- HO Request Ack目标小区将终端的接纳信息以及其它配置信息反馈给源小区- RRC Connection Reconfiguration（HO Command）将目标小区的接纳信息及配置信息发给终端，告知终端目标小区已准备好终端接入，重配消息里包含目标小区的测量控制- SN Status Transfer源小区将终端业务的缓存数据移至目标小区- Random Access Preamble终端收到第5步重配消息（切换命令）后使用重配消息里的接入信息进行接入- Random Access Response目标小区接入响应，收到此命令后可认为接入完成了，然后终端在RRC层上发重配完成消息（第9步）- RRC Connect Reconfiguration complete（HO Confirm）上报重配完成消息，切换完成- Release Resource当终端成功接入后，目标小区通知源小区删除终端的上下文信息四、协议对LTE事件的定义和说明4.1 A1事件定义Event A1 (Serving becomes better than threshold)The UE shall:1> consider the entering condition for this event to be satisfied when condition A1-1, as specifiedbelow, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition A1-2, as specifiedbelow, is fulfilled;1> for this measurement, consider the primary or secondary cell that is configured on the frequencyindicated in the associated measObjectEUTRA to be the serving cell;Inequality A1-1 (Entering condition)-Ms>HysThreshInequality A1-2 (Leaving condition)Ms<+ThreshHysThe variables in the formula are defined as follows:Ms is the measurement result of the serving cell, not taking into account any offsets.Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within reportConfigEUTRA for this event).Thresh is the threshold parameter for this event (i.e. a1-Threshold as defined within reportConfigEUTRA for this event).Ms is expressed in dBm in case of RSRP, or in dB in case of RSRQ.Hys is expressed in dB.Thresh is expressed in the same unit as Ms.4.2 A2事件定义Event A2 (Serving becomes worse than threshold)The UE shall:1> consider the entering condition for this event to be satisfied when condition A2-1, as specifiedbelow, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition A2-2, as specifiedbelow, is fulfilled;1> for this measurement, consider the primary or secondary cell that is configured on the frequencyindicated in the associated measObjectEUTRA to be the serving cell;Inequality A2-1 (Entering condition)+Ms<HysThreshInequality A2-2 (Leaving condition)Ms>-HysThreshThe variables in the formula are defined as follows:Ms is the measurement result of the serving cell, not taking into account any offsets.Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within reportConfigEUTRA for this event).Thresh is the threshold parameter for this event (i.e. a2-Threshold as defined within reportConfigEUTRA for this event).Ms is expressed in dBm in case of RSRP, or in dB in case of RSRQ.Hys is expressed in dB.Thresh is expressed in the same unit as Ms.4.3 A3事件定义Event A3 (Neighbour becomes offset better than PCell)The UE shall:1> consider the entering condition for this event to be satisfied when condition A3-1, as specifiedbelow, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition A3-2, as specifiedbelow, is fulfilled;NOTE The cell(s) that triggers the event is on the frequency indicated in the associated measObject which may be different from the (primary) frequency used by the PCell.Inequality A3-1 (Entering condition)++>+Mn++-OcnOfpOcpMpHysOffOfnInequality A3-2 (Leaving condition)++<Mn++++MpOcpOfnOfpOffHysOcnThe variables in the formula are defined as follows:Mn is the measurement result of the neighbouring cell, not taking into account any offsets.Ofn is the frequency specific offset of the frequency of the neighbour cell (i.e. offsetFreq as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell).Ocn is the cell specific offset of the neighbour cell (i.e. cellIndividualOffset as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell), and set to zero if not configured for the neighbour cell.Mp is the measurement result of the PCell, not taking into account any offsets.Ofp is the frequency specific offset of the primary frequency (i.e. offsetFreq as defined within measObjectEUTRA corresponding to the primary frequency).Ocp is the cell specific offset of the PCell (i.e. cellIndividualOffset as defined within measObjectEUTRA corresponding to the primary frequency), and is set to zero if not configured for the PCell.Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within reportConfigEUTRA for this event).Off is the offset parameter for this event (i.e. a3-Offset as defined within reportConfigEUTRA for this event).Mn, Mp are expressed in dBm in case of RSRP, or in dB in case of RSRQ.Ofn, Ocn, Ofp, Ocp, Hys, Off are expressed in dB.4.4 A4事件定义Event A4 (Neighbour becomes better than threshold)The UE shall:1> consider the entering condition for this event to be satisfied when condition A4-1, as specifiedbelow, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition A4-2, as specifiedbelow, is fulfilled;Inequality A4-1 (Entering condition)-+Mn>+HysThreshOcnOfnInequality A4-2 (Leaving condition)Mn<+++ThreshOfnHysOcnThe variables in the formula are defined as follows:Mn is the measurement result of the neighbouring cell, not taking into account any offsets.Ofn is the frequency specific offset of the frequency of the neighbour cell (i.e. offsetFreq as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell).Ocn is the cell specific offset of the neighbour cell (i.e. cellIndividualOffset as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell), and set to zero if not configured for the neighbour cell.Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within reportConfigEUTRA for this event).Thresh is the threshold parameter for this event (i.e. a4-Threshold as defined within reportConfigEUTRA for this event).Mn is expressed in dBm in case of RSRP, or in dB in case of RSRQ.Ofn, Ocn, Hys are expressed in dB.Thresh is expressed in the same unit as Mn.4.5 A5事件定义Event A5 (PCell becomes worse than threshold1 and neighbour becomes better than threshold2)The UE shall:1> consider the entering condition for this event to be satisfied when both condition A5-1 andcondition A5-2, as specified below, are fulfilled;1> consider the leaving condition for this event to be satisfied when condition A5-3 or condition A5-4, i.e. at least one of the two, as specified below, is fulfilled;NOTE: The cell(s) that triggers the event is on the frequency indicated in the associatedmeasObject which may be different from the (primary) frequency used by the PCell.Inequality A5-1 (Entering condition 1)1Thresh Hys Mp <+Inequality A5-2 (Entering condition 2)2Thresh Hys Ocn Ofn Mn >-++Inequality A5-3 (Leaving condition 1)1Thresh Hys Mp >-Inequality A5-4 (Leaving condition 2)2Thresh Hys Ocn Ofn Mn <+++The variables in the formula are defined as follows:Mp is the measurement result of the PCell, not taking into account any offsets.Mn is the measurement result of the neighbouring cell, not taking into account any offsets.Ofn is the frequency specific offset of the frequency of the neighbour cell (i.e. offsetFreq as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell).Ocn is the cell specific offset of the neighbour cell (i.e. cellIndividualOffset as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell), and set to zero if not configured for the neighbour cell.Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within reportConfigEUTRA for this event).Thresh1 is the threshold parameter for this event (i.e. a5-Threshold1 as defined within reportConfigEUTRA for this event).Thresh2 is the threshold parameter for this event (i.e. a5-Threshold2 as defined within reportConfigEUTRA for this event).Mn, Mp are expressed in dBm in case of RSRP, or in dB in case of RSRQ.Ofn, Ocn, Hys are expressed in dB.Thresh1 is expressed in the same unit as Mp .Thresh2 is expressed in the same unit as Mn .Event A6 (Neighbour becomes offset better than SCell)The UE shall:1> consider the entering condition for this event to be satisfied when condition A6-1, as specifiedbelow, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition A6-2, as specifiedbelow, is fulfilled;1> for this measurement, consider the (secondary) cell that is configured on the frequency indicatedin the associated measObjectEUTRA to be the serving cell;NOTE: The neighbour(s) is on the same frequency as the SCell i.e. both are on the frequency indicated in the associated measObject.Inequality A6-1 (Entering condition)+>Mn++-MsOcsOffHysOcnInequality A6-2 (Leaving condition)+<+Mn++OcsOffMsHysOcnThe variables in the formula are defined as follows:Mn is the measurement result of the neighbouring cell, not taking into account any offsets.Ocn is the cell specific offset of the neighbour cell (i.e. cellIndividualOffset as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell), and set to zero if not configured for the neighbour cell.Ms is the measurement result of the serving cell, not taking into account any offsets.Ocs is the cell specific offset of the serving cell (i.e. cellIndividualOffset as defined within measObjectEUTRA corresponding to the serving frequency), and is set to zero if not configured for the serving cell.Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within reportConfigEUTRA for this event).Off is the offset parameter for this event (i.e. a6-Offset as defined within reportConfigEUTRA for this event).Mn, Ms are expressed in dBm in case of RSRP, or in dB in case of RSRQ.Ocn, Ocs, Hys, Off are expressed in dB.Event B1 (Inter RAT neighbour becomes better than threshold)The UE shall:1> for UTRA and CDMA2000, only trigger the event for cells included in the correspondingmeasurement object;1> consider the entering condition for this event to be satisfied when condition B1-1, as specifiedbelow, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition B1-2, as specifiedbelow, is fulfilled;Inequality B1-1 (Entering condition)Thresh+Mn>-HysOfnInequality B1-2 (Leaving condition)++Mn<ThreshHysOfnThe variables in the formula are defined as follows:Mn is the measurement result of the inter-RAT neighbour cell, not taking into account any offsets.For CDMA 2000 measurement result, pilotStrength is divided by -2.Ofn is the frequency specific offset of the frequency of the inter-RAT neighbour cell (i.e. offsetFreq as defined within the measObject corresponding to the frequency of the neighbour inter-RAT cell).Hys is the hysteresis parameter for this event (i.e. hysteresis as defined withinreportConfigInterRAT for this event).Thresh is the threshold parameter for this event (i.e. b1-Threshold as defined within reportConfigInterRAT for this event). For CDMA2000, b1-Threshold is divided by -2.Mn is expressed in dBm or in dB, depending on the measurement quantity of the inter-RAT neighbour cell.Ofn, Hys are expressed in dB.Thresh is expressed in the same unit as Mn.4.8 B2事件定义Event B2 (PCell becomes worse than threshold1 and inter RAT neighbour becomes better than threshold2)The UE shall:1> for UTRA and CDMA2000, only trigger the event for cells included in the correspondingmeasurement object;1> consider the entering condition for this event to be satisfied when both condition B2-1 andcondition B2-2, as specified below, are fulfilled;1> consider the leaving condition for this event to be satisfied when condition B2-3 or conditionB2-4, i.e. at least one of the two, as specified below, is fulfilled;Inequality B2-1 (Entering condition 1)+HysMp<Thresh1Inequality B2-2 (Entering condition 2)-+Mn>Ofn2ThreshHysInequality B2-3 (Leaving condition 1)Hys-Mp>1ThreshInequality B2-4 (Leaving condition 2)Mn<++OfnHys2ThreshThe variables in the formula are defined as follows:Mp is the measurement result of the PCell, not taking into account any offsets.Mn is the measurement result of the inter-RAT neighbour cell, not taking into account any offsets.For CDMA2000 measurement result, pilotStrength is divided by -2.Ofn is the frequency specific offset of the frequency of the inter-RAT neighbour cell (i.e. offsetFreq as defined within the measObject corresponding to the frequency of the inter-RAT neighbourcell).Hys is the hysteresis parameter for this event (i.e. hysteresis as defined withinreportConfigInterRAT for this event).Thresh1 is the threshold parameter for this event (i.e. b2-Threshold1 as defined within reportConfigInterRAT for this event).Thresh2 is the threshold parameter for this event (i.e. b2-Threshold2 as defined within reportConfigInterRAT for this event). For CDMA2000, b2-Threshold2 is divided by -2.Mp is expressed in dBm in case of RSRP, or in dB in case of RSRQ.Mn is expressed in dBm or dB, depending on the measurement quantity of the inter-RAT neighbour cell.Ofn, Hys are expressed in dB.修正版Thresh1 is expressed in the same unit as Mp. Thresh2 is expressed in the same unit as Mn.。
A1-B2事件
LTE支持的切换事件有A类和B类，其中A类本用作系统内测量，B类被用作系统间测量A1事件：表示服务小区信号质量高于一定门限；A2事件：表示服务小区信号质量低于一定门限；A3事件：表示邻区质量高于服务小区质量，用于同频、异频的基于覆盖的切换； A4事件：表示邻区质量高于一定门限，用于基于负荷的切换，可用于负载均衡；A5事件：表示服务小区质量低于一定门限并且邻区质量高于一定门限，可用于负载均衡; 异系统测量事件：B1事件：邻小区质量高于一定门限，用于测量高优先级的异系统小区；B2事件：服务小区质量低于一定门限，并且邻小区质量高于一定门限，用于相同或较低优先级的异系统小区的测量。
LTE移动性参数(全局)最小接入电平基本信息参数功能该参数表示UE在该小区驻留需满足的最小接收电平门限。
该值取值范围是2G/3G接收电平的实际值，对于LTE/3G , 实际的RxlevMin 等于SIB3/SIB6的IE value的两倍，调整步长为2dbm。
对于2G，实际的RxlevMin等于SIB7的(IE value * 2) - 115，调整步长为2dBm当UE测量到的2G/3G电平满足S准则时，UE才可能驻留在该小区。
参数调整影响调整该参数的门限值，会对小区的选择和驻留有所影响。
QrxLevMin如果设置过高，则UE将无法驻留到该小区。
2高优先级重选门限基本信息参数功能当高优先级小区的S值在一定时间内高于该阀值(threshXHigh)后，UE可以重选到该小区。
参数调整影响调整该参数的门限值，会对小区的选择和驻留有所影响。
threshXhigh如果设置过高，会增加UE重选到高优先级小区的难度。
3低优先级重选门限基本信息参数功能当低优先级小区的S值在一定时间内高于该阀值(threshXLow)后，同时主服务小区的S值低于threshServingLow，UE可以重选到该低优先级小区。
参数调整影响调整该参数的门限值，会对小区的选择和驻留有所影响。
LTEAB切换事件
一、L T E切换事件系统内测量事件采用Ax来标识，系统内事件的报告各类：●eventA1：服务小区质量高于一个绝对门限（serving>threshold）。
用于关闭正在进行的频间测量，在RRC控制下去掉激活测量间隙（gap）事件进入条件：Ms-Hys>Thresh事件离开条件：Ms+Hys<Thresh其中Ms：为服务小区的测量结果，没有计算任何小区各自的偏置如果测量的是RSRP则单位为dBm，如果是RSRQ则单位为dB。
Hys：为此事件的滞后参数。
单位为dB。
取值范围（0-30）实际值=取值*0.5dBThresh：为此事件的门限参数。
单位同Ms一样●eventA2：服务小区质量低于一个绝对门限（serving<threshold）。
用于打开频间测量，在RRC控制下激活测量间隙（gap）。
事件进入条件：Ms+Hys<Thresh事件离开条件：Ms-Hys>Thresh●eventA3：邻小区比服务小区质量高于一个门限（Neighbour>Serving+Offset）用于频内/频间的基于覆盖的切换。
事件进入条件：Mn+Ofn+Ocn-Hys>Ms+Ofs+Ocs+Off事件离开条件：Mn+Ofn+Ocn+Hys<Ms+Ofs+Ocs+Off其中Mn：邻小区的测量结果，不考虑计算任何偏置。
Ofn：该邻区频率特定的偏置（即offsetFreq在measObjectEUTRA中被定义为对应于邻区的频率）Ocn：为该邻区的小区特定偏置（即cellIndividualOffset在measObjectEUTRA中被定义为对应于邻区的频率），同时如果没有为邻区配置，则设置为零。
Ms：为没有计算任何偏置下的服务小区的测量结果。
Ofs：为服务频率上频率特定的偏置（即offsetFreq在measObjectEUTRA中被定义为对应于服务频率）Ocs：为服务小区的小区特定偏置（即cellIndividualOffset在measObjectEUTRA中被定义为对应于服务频率），并设置为0，如果没有为服务小区配置的话；Hys：为该事件的滞后参数（即hysteres为reportConfigEUTRA内为该事件定义的参数）。
LTE切换事件介绍
Ocn：邻小区个性偏移（CIO）
Hys(5)：A5事件迟滞参数 Thersh1:A5事件门限1参数 Thersh2:A5事件门限2参数
B1事件的切换参数配置
B1事件表示：异系统邻区质量高于一个绝对门限，满足事件触发条件的小 区信息被上报时，源eNodeB启动异系统切换请求，用于基于负荷的切换 B1事件判决公式： 触发条件： Mn + Ofn - Hys(b1) > Thersh(b1) 取消条件：Mn + Ofn + Hys(b1) > Thersh(b1) 其中： Mn:邻小区测量结果 Ofn：邻小区频率特定的偏差，默认为0
根据A1事件触发条件：Ms – Hys(1) > Thersh(1）可以算出： Ms>-86时关闭异频测量。 根据A2事件触发条件：Ms + Hys(2) < Thersh(2) 可以算出： Ms<-92时开启异频测量 则当UE测量到的A小区RSRP值为红色区域时，UE不进行异频测量；当 UE测量到的A小区RSRP值为绿色区域时，UE进行异频测量；当UE测量到的A 小区RSRP值为黄色区域时，UE是否进行异频测量取决于UE之前的状态，即 UE的测量状态并不改变。
频内/频间基于覆盖的切换 B1事件：异系统邻区质量高于一个绝对门限，用于基于负荷的切换。
B2事件：服务小区质量低于一个绝对门限1且异系统邻区质量高于一个绝对门限2，
用于基于覆盖的切换。
A1事件的切换参数配置
A1事件触发条件：Ms – Hys(1) > Thersh(1） A1事件取消条件：Ms + Hys(2) < Thersh(2) 其中： Ms:服务小区测量结果 Hys(1)：A1事件迟滞参数 Hys(2)：A2事件迟滞参数 Thersh（1）:A1事件门限参数 Thersh（2）:A2事件门限参数
移动LTE系统事件介绍
LTE系统事件介绍一、LTE事件概述LTE切换时需要UE上报测量的结果（包括RSRP，RSRQ等），而上报又分为周期性上报和事件触发的上报。
周期性上报由基站配置，UE直接上报测量的结果。
事件触发的上报又分为系统内的事件和系统间的事件。
LTE系统内切换主要事件包括：A1事件，服务小区质量高于门限；这个事件可以用来关闭频间测量。
A2事件，服务小区质量低于门限；这个事件可以用来打开频间测量和系统间测量，因为这个事件发生后可能发生切换等操作。
A3事件，邻小区质量好于服务小区质量；这个事件一般用于频内/间基于覆盖的切换。
A4事件，邻小区质量好于门限；这个事件一般用于基于负荷的切换。
A5事件，服务小区质量低于一个门限并且邻小区质量高于一个门限；这个事件也可以用于频内/间基于覆盖的切换。
目前LTE同频切换都是基于A3/A5事件进行的切换（现网主要是基于A3事件的）二、切换流程举例- RRC Connection Reconfiguration（Measurement Control）测量控制，一般在初始接入或上一次切换命令中的重配消息里携带- Measurement Report测量报告，终端根据当前小区的测量控制信息，将符合切换门限的小区进行上报- HO Request源小区在收到测量报告后向目标小区申请资源及配置信息（站内切换的话为站内交互，站间切换会使用X2口或者S1口，优先使用X2口）- HO Request Ack目标小区将终端的接纳信息以及其它配置信息反馈给源小区- RRC Connection Reconfiguration（HO Command）将目标小区的接纳信息及配置信息发给终端，告知终端目标小区已准备好终端接入，重配消息里包含目标小区的测量控制- SN Status Transfer源小区将终端业务的缓存数据移至目标小区- Random Access Preamble终端收到第5步重配消息（切换命令）后使用重配消息里的接入信息进行接入- Random Access Response目标小区接入响应，收到此命令后可认为接入完成了，然后终端在RRC层上发重配完成消息（第9步）- RRC Connect Reconfiguration complete（HO Confirm）上报重配完成消息，切换完成- Release Resource当终端成功接入后，目标小区通知源小区删除终端的上下文信息四、协议对LTE事件的定义和说明4.1 A1事件定义Event A1 (Serving becomes better than threshold)The UE shall:1> consider the entering condition for this event to be satisfied when condition A1-1, as specifiedbelow, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition A1-2, as specifiedbelow, is fulfilled;1> for this measurement, consider the primary or secondary cell that is configured on the frequencyindicated in the associated measObjectEUTRA to be the serving cell;Inequality A1-1 (Entering condition)-Ms>HysThreshInequality A1-2 (Leaving condition)Ms<+ThreshHysThe variables in the formula are defined as follows:Ms is the measurement result of the serving cell, not taking into account any offsets.Hys is the hysteresis parameter for this event (i.e. hysteresis as defined withinreportConfigEUTRA for this event).Thresh is the threshold parameter for this event (i.e. a1-Threshold as defined within reportConfigEUTRA for this event).Ms is expressed in dBm in case of RSRP, or in dB in case of RSRQ.Hys is expressed in dB.Thresh is expressed in the same unit as Ms.4.2 A2事件定义Event A2 (Serving becomes worse than threshold)The UE shall:1> consider the entering condition for this event to be satisfied when condition A2-1, as specifiedbelow, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition A2-2, as specifiedbelow, is fulfilled;1> for this measurement, consider the primary or secondary cell that is configured on the frequencyindicated in the associated measObjectEUTRA to be the serving cell;Inequality A2-1 (Entering condition)+Ms<HysThreshInequality A2-2 (Leaving condition)Ms>-HysThreshThe variables in the formula are defined as follows:Ms is the measurement result of the serving cell, not taking into account any offsets.Hys is the hysteresis parameter for this event (i.e. hysteresis as defined withinreportConfigEUTRA for this event).Thresh is the threshold parameter for this event (i.e. a2-Threshold as defined within reportConfigEUTRA for this event).Ms is expressed in dBm in case of RSRP, or in dB in case of RSRQ.Hys is expressed in dB.Thresh is expressed in the same unit as Ms.4.3 A3事件定义Event A3 (Neighbour becomes offset better than PCell)The UE shall:1> consider the entering condition for this event to be satisfied when condition A3-1, as specifiedbelow, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition A3-2, as specifiedbelow, is fulfilled;NOTE The cell(s) that triggers the event is on the frequency indicated in the associated measObject which may be different from the (primary) frequency used by the PCell.Inequality A3-1 (Entering condition)++>+Mn++-OcnOfpOcpMpHysOffOfnInequality A3-2 (Leaving condition)++<Mn++++MpOcpOfnOfpOffHysOcnThe variables in the formula are defined as follows:Mn is the measurement result of the neighbouring cell, not taking into account any offsets.Ofn is the frequency specific offset of the frequency of the neighbour cell (i.e. offsetFreq as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell).Ocn is the cell specific offset of the neighbour cell (i.e. cellIndividualOffset as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell), and set to zero if not configured for the neighbour cell.Mp is the measurement result of the PCell, not taking into account any offsets.Ofp is the frequency specific offset of the primary frequency (i.e. offsetFreq as defined within measObjectEUTRA corresponding to the primary frequency).Ocp is the cell specific offset of the PCell (i.e. cellIndividualOffset as defined within measObjectEUTRA corresponding to the primary frequency), and is set to zero if not configured for the PCell.Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within reportConfigEUTRA for this event).Off is the offset parameter for this event (i.e. a3-Offset as defined within reportConfigEUTRA for this event).Mn, Mp are expressed in dBm in case of RSRP, or in dB in case of RSRQ.Ofn, Ocn, Ofp, Ocp, Hys, Off are expressed in dB.4.4 A4事件定义Event A4 (Neighbour becomes better than threshold)The UE shall:1> consider the entering condition for this event to be satisfied when condition A4-1, as specifiedbelow, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition A4-2, as specifiedbelow, is fulfilled;Inequality A4-1 (Entering condition)-+Mn>+HysThreshOcnOfnInequality A4-2 (Leaving condition)Mn<+++ThreshOfnHysOcnThe variables in the formula are defined as follows:Mn is the measurement result of the neighbouring cell, not taking into account any offsets.Ofn is the frequency specific offset of the frequency of the neighbour cell (i.e. offsetFreq as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell).Ocn is the cell specific offset of the neighbour cell (i.e. cellIndividualOffset as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell), and set to zero if not configured for the neighbour cell.Hys is the hysteresis parameter for this event (i.e. hysteresis as defined withinreportConfigEUTRA for this event).Thresh is the threshold parameter for this event (i.e. a4-Threshold as defined within reportConfigEUTRA for this event).Mn is expressed in dBm in case of RSRP, or in dB in case of RSRQ.Ofn, Ocn, Hys are expressed in dB.Thresh is expressed in the same unit as Mn.4.5 A5事件定义Event A5 (PCell becomes worse than threshold1 and neighbour becomes better than threshold2)The UE shall:1> consider the entering condition for this event to be satisfied when both condition A5-1 andcondition A5-2, as specified below, are fulfilled;1> consider the leaving condition for this event to be satisfied when condition A5-3 or conditionA5-4, i.e. at least one of the two, as specified below, is fulfilled;NOTE: The cell(s) that triggers the event is on the frequency indicated in the associated measObject which may be different from the (primary) frequency used by the PCell.Inequality A5-1 (Entering condition 1)+Mp<HysThresh1Inequality A5-2 (Entering condition 2)+-+Mn>Thresh2HysOcnOfnInequality A5-3 (Leaving condition 1)-Mp>HysThresh1Inequality A5-4 (Leaving condition 2)2++Mn<+OfnHysThreshOcnThe variables in the formula are defined as follows:Mp is the measurement result of the PCell, not taking into account any offsets.Mn is the measurement result of the neighbouring cell, not taking into account any offsets.Ofn is the frequency specific offset of the frequency of the neighbour cell (i.e. offsetFreq as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell).Ocn is the cell specific offset of the neighbour cell (i.e. cellIndividualOffset as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell), and set to zero if not configured for the neighbour cell.Hys is the hysteresis parameter for this event (i.e. hysteresis as defined withinreportConfigEUTRA for this event).Thresh1 is the threshold parameter for this event (i.e. a5-Threshold1 as defined within reportConfigEUTRA for this event).Thresh2 is the threshold parameter for this event (i.e. a5-Threshold2 as defined within reportConfigEUTRA for this event).Mn, Mp are expressed in dBm in case of RSRP, or in dB in case of RSRQ.Ofn, Ocn, Hys are expressed in dB.Thresh1is expressed in the same unit as Mp.Thresh2is expressed in the same unit as Mn.Event A6 (Neighbour becomes offset better than SCell)The UE shall:1> consider the entering condition for this event to be satisfied when condition A6-1, as specifiedbelow, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition A6-2, as specifiedbelow, is fulfilled;1> for this measurement, consider the (secondary) cell that is configured on the frequency indicatedin the associated measObjectEUTRA to be the serving cell;NOTE: The neighbour(s) is on the same frequency as the SCell i.e. both are on the frequency indicated in the associated measObject.Inequality A6-1 (Entering condition)+>Mn++-MsOcsOffHysOcnInequality A6-2 (Leaving condition)+<+Mn++OcsOffMsHysOcnThe variables in the formula are defined as follows:Mn is the measurement result of the neighbouring cell, not taking into account any offsets.Ocn is the cell specific offset of the neighbour cell (i.e. cellIndividualOffset as defined within measObjectEUTRA corresponding to the frequency of the neighbour cell), and set to zero if not configured for the neighbour cell.Ms is the measurement result of the serving cell, not taking into account any offsets.Ocs is the cell specific offset of the serving cell (i.e. cellIndividualOffset as defined within measObjectEUTRA corresponding to the serving frequency), and is set to zero if not configured for the serving cell.Hys is the hysteresis parameter for this event (i.e. hysteresis as defined within reportConfigEUTRA for this event).Off is the offset parameter for this event (i.e. a6-Offset as defined within reportConfigEUTRA for this event).Mn, Ms are expressed in dBm in case of RSRP, or in dB in case of RSRQ.Ocn, Ocs, Hys, Off are expressed in dB.Event B1 (Inter RAT neighbour becomes better than threshold)The UE shall:1> for UTRA and CDMA2000, only trigger the event for cells included in the correspondingmeasurement object;1> consider the entering condition for this event to be satisfied when condition B1-1, as specifiedbelow, is fulfilled;1> consider the leaving condition for this event to be satisfied when condition B1-2, as specifiedbelow, is fulfilled;Inequality B1-1 (Entering condition)Thresh+Mn>-HysOfnInequality B1-2 (Leaving condition)++Mn<ThreshHysOfnThe variables in the formula are defined as follows:Mn is the measurement result of the inter-RAT neighbour cell, not taking into account any offsets.For CDMA 2000 measurement result, pilotStrength is divided by -2.Ofn is the frequency specific offset of the frequency of the inter-RAT neighbour cell (i.e. offsetFreq as defined within the measObject corresponding to the frequency of the neighbour inter-RAT cell).Hys is the hysteresis parameter for this event (i.e. hysteresis as defined withinreportConfigInterRAT for this event).Thresh is the threshold parameter for this event (i.e. b1-Threshold as defined within reportConfigInterRAT for this event). For CDMA2000, b1-Threshold is divided by -2.Mn is expressed in dBm or in dB, depending on the measurement quantity of the inter-RAT neighbour cell.Ofn, Hys are expressed in dB.Thresh is expressed in the same unit as Mn.4.8 B2事件定义Event B2 (PCell becomes worse than threshold1 and inter RAT neighbour becomes better than threshold2)The UE shall:1> for UTRA and CDMA2000, only trigger the event for cells included in the correspondingmeasurement object;1> consider the entering condition for this event to be satisfied when both condition B2-1 andcondition B2-2, as specified below, are fulfilled;1> consider the leaving condition for this event to be satisfied when condition B2-3 or conditionB2-4, i.e. at least one of the two, as specified below, is fulfilled;Inequality B2-1 (Entering condition 1)+HysMp<Thresh1Inequality B2-2 (Entering condition 2)-+Mn>Ofn2ThreshHysInequality B2-3 (Leaving condition 1)Hys-Mp>1ThreshInequality B2-4 (Leaving condition 2)Mn<++OfnHys2ThreshThe variables in the formula are defined as follows:Mp is the measurement result of the PCell, not taking into account any offsets.Mn is the measurement result of the inter-RAT neighbour cell, not taking into account any offsets.For CDMA2000 measurement result, pilotStrength is divided by -2.Ofn is the frequency specific offset of the frequency of the inter-RAT neighbour cell (i.e. offsetFreq as defined within the measObject corresponding to the frequency of the inter-RAT neighbourcell).Hys is the hysteresis parameter for this event (i.e. hysteresis as defined withinreportConfigInterRAT for this event).Thresh1 is the threshold parameter for this event (i.e. b2-Threshold1 as defined within reportConfigInterRAT for this event).Thresh2 is the threshold parameter for this event (i.e. b2-Threshold2 as defined within reportConfigInterRAT for this event). For CDMA2000, b2-Threshold2 is divided by -2.Mp is expressed in dBm in case of RSRP, or in dB in case of RSRQ.Mn is expressed in dBm or dB, depending on the measurement quantity of the inter-RAT neighbour cell.Ofn, Hys are expressed in dB.Thresh1is expressed in the same unit as Mp.Thresh2is expressed in the same unit as Mn.第11页。
LTE的9种传输模式和7个切换事件
LTE的9种传输模式：1. TM1，单天线端口传输：主要应用于单天线传输的场合2. TM2，开环发射分集：不需要反馈PMI，适合于小区边缘信道情况比较复杂，干扰较大的情况，有时候也用于高速的情况，分集能够提供分集增益3. TM3，开环空间复用：不需要反馈PMI，合适于终端（UE）高速移动的情况4. TM4，闭环空间复用：需要反馈PMI，适合于信道条件较好的场合，用于提供高的数据率传输5. TM5，MU-MIMO传输模式（下行多用户MIMO）：主要用来提高小区的容量6. TM6，闭环发射分集，闭环Rank1预编码的传输：需要反馈PMI，主要适合于小区边缘的情况7. TM7，Port5的单流Beamforming模式：主要也是小区边缘，能够有效对抗干扰8. TM8，双流Beamforming模式：可以用于小区边缘也可以应用于其他场景9. TM9, 传输模式9是LTE-A中新增加的一种模式，可以支持最大到8层的传输，主要为了提升数据传输速率必须牢记的7个切换事件：●事件A1表示服务小区质量高于一定门限，当满足事件触发条件时UE便上报测量报告，eNodeB停止异频/异系统测量。
但在基于频率优先级的切换中，事件A1用于启动异频测量。
●事件A2表示服务小区质量低于一定门限，当满足事件触发条件时UE便上报测量报告，eNodeB启动异频/异系统测量。
但在基于频率优先级的切换中，事件A2用于停止异频测量。
●事件A3表示同频/异频邻区质量相比服务小区质量高出一定门限，当满足事件触发条件的小区信息被上报时，源eNodeB启动同频/异频切换请求。
●事件A4表示异频邻区质量高于一定门限，满足事件触发条件的小区信息被上报时，源eNodeB启动异频切换请求。
●事件A5表示服务小区质量低于一定门限，同时异频邻区质量高于一定门限，满足事件触发条件的小区信息被上报时，源eNodeB启动异频切换请求。
●事件B1表示异系统邻区质量高于一定门限，满足事件触发条件的小区信息被上报时，源eNodeB启动异系统切换请求。
LTE A B切换事件
一、L T E切换事件系统内测量事件采用Ax来标识，系统内事件的报告各类：●eventA1：服务小区质量高于一个绝对门限（serving>threshold）。
用于关闭正在进行的频间测量，在RRC控制下去掉激活测量间隙（gap）事件进入条件：Ms-Hys>Thresh事件离开条件：Ms+Hys<Thresh其中Ms：为服务小区的测量结果，没有计算任何小区各自的偏置如果测量的是RSRP则单位为dBm，如果是RSRQ则单位为dB。
Hys：为此事件的滞后参数。
单位为dB。
取值范围（0-30）实际值=取值*0.5dBThresh：为此事件的门限参数。
单位同Ms一样●eventA2：服务小区质量低于一个绝对门限（serving<threshold）。
用于打开频间测量，在RRC控制下激活测量间隙（gap）。
事件进入条件：Ms+Hys<Thresh事件离开条件：Ms-Hys>Thresh●eventA3：邻小区比服务小区质量高于一个门限（Neighbour>Serving+Offset）用于频内/频间的基于覆盖的切换。
●事件进入条件：Mn+Ofn+Ocn-Hys>Ms+Ofs+Ocs+Off●事件离开条件：Mn+Ofn+Ocn+Hys<Ms+Ofs+Ocs+Off●其中●Mn：邻小区的测量结果，不考虑计算任何偏置。
●Ofn：该邻区频率特定的偏置（即offsetFreq在measObjectEUTRA中被定义为对应于邻区的频率）●Ocn：为该邻区的小区特定偏置（即cellIndividualOffset在measObjectEUTRA中被定义为对应于邻区的频率），同时如果没有为邻区配置，则设置为零。
●Ms：为没有计算任何偏置下的服务小区的测量结果。
●Ofs：为服务频率上频率特定的偏置（即offsetFreq在measObjectEUTRA中被定义为对应于服务频率）●Ocs：为服务小区的小区特定偏置（即cellIndividualOffset在measObjectEUTRA中被定义为对应于服务频率），并设置为0，如果没有为服务小区配置的话；●Hys：为该事件的滞后参数（即hysteres为reportConfigEUTRA内为该事件定义的参数）。
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A3 事件
件A3表示邻区信号质量开始比服务小区信号质量好。
基于覆盖的同频切换特性打开的情况下，当UE建立无线承载时，eNodeB向UE下发事件A3相关测量配置。
事件A3的触发与取消条件如下，如图3-1和图3-2所示。
事件A3详细请参见3GPP TS 36.331 V10.1.0中的5.5.4.4 Event A3 (Neighbour becomes offset better than PCell)。
∙触发条件：Mn+Ofn+Ocn-Hys>Ms+Ofs+Ocs+Off
当事件A3触发时，eNodeB收到UE上报的事件A3，对上报的目标小区列表进行切换判
决。
∙取消条件：Mn+Ofn+Ocn+Hys<Ms+Ofs+Ocs+Off
当事件A3取消时，UE不再上报事件A3。
图3-1 事件A3触发条件
图3-2 事件A3取消条件
事件A3公式中的变量如表3-2所示。
例如，当配置Hys为2dB，Off为2dB，通过测试发现UE在源小区和目标小区间切换时，总是出现源小区信号快速下降，目标小区信号很快上升的情况。
为了达到提前触发同频切换的目的，则将服务小区配置Ocs为-1 dB，对目标小区配置Ocn为1 dB。
同频切换Ofs与Ofn相同，假设配置为0 dB，代入上述A3事件触发判决公式为：
Mn+0+1-2>Ms+0-1+2。
则目标小区只要比服务小区信号质量大2 dB，即可满足事件A3的触发条件，触发同频切换。
表3-2 事件A3相关参数列表
事件A3上报的其他相关报告配置参数如表3-3所示。
表3-3 事件A3上报相关参数
A4事件
事件A4表示邻区信号质量变得高于对应门限。
事件A4的触发与取消条件如下，如图4-3所示。
事件A4详细请参见3GPP TS 36.331 V10.1.0中的5.5.4.5 Event A4 (Neighbour becomes better than threshold)。
∙触发条件：Mn+Ofn+Ocn-Hys>Thresh
当事件A4触发时，eNodeB收到UE上报事件A4。
∙取消条件：Mn+Ofn+Ocn+Hys<Thresh
当事件A4取消时，则UE不再上报事件A4。
图4-3 事件A4触发
事件A4公式中的变量如表4-10所示。
表4-10 事件A4相关参数列表
事件A4门限参数如表4-11所示。
表4-11 事件A4门限参数列表
事件A4上报的其他相关报告配置参数如表4-12所示。
表4-12 事件A4上报相关参数
B1事件
事件B1表示异系统邻区信号质量变得高于对应门限。
事件B1的触发与取消条件如下，如图3-1所示。
事件B1详细请参见3GPP TS 36.331 V10.1.0中的5.5.4.7 Event B1 (Inter RAT neighbour becomes better than threshold)。
∙触发条件：Mn+Ofn-Hys>Thresh
当事件B1触发时，eNodeB收到UE上报事件B1，则启动异系统切换判决。
∙取消条件：Mn+Ofn+Hys<Thresh
当事件B1取消时，则UE不再上报事件B1。
图3-1 事件B1触发与取消条件
事件B1公式中的变量如表3-8所示。
表3-8 UTRAN系统的事件B1相关参数列表
事件B1上报的其他相关报告配置参数如表3-9所示。
表3-9 事件B1上报相关参数
B2事件
事件B2表示服务小区信号质量变得低于门限1并且邻区信号质量变得高于门限2。
事件B2的触发与取消条件如下，如图3-2所示。
事件B2详细请参见3GPP TS 36.331 V10.1.0中的5.5.4.8 Event B2 (PCell becomes worse than threshold1 and inter RAT neighbour becomes better than threshold2)。
触发条件：Ms+Hys<Thresh1且Mn+Ofn-Hys>Thresh2
取消条件：Ms-Hys>Thresh1或Mn+Ofn+Hys<Thresh2
图3-2 事件B2触发
除了门限参数，其他事件B2的变量参数与事件B1变量参数保持一致，如表3-8和表3-9所示。
事件B2用于触发异系统切换时，门限Thresh1与基于覆盖的异系统切换事件A2门限相同，门限Thresh2与基于覆盖的异系统切换事件B1事件相同，如表3-10所示。
表3-10 UTRAN系统的事件B2门限参数列表。