LTE中各事件定义与应用
LTE常见事件解释及定时器
1.1 4.5.1 切换正常流程同频切换同时支持同eNodeB切换，同MME的异eNodeB切换，跨MME的异eNodeB切换场景。
对于后两种场景依据eNodeB间是否建立X2接口，切换信令流程略有不同。
图4-2 同MME异eNodeB间切换流程同MME异eNodeB间的同频切换信令流程如图4-2所示：1.在无线承载建立时，源eNodeB下发RRC Connection Reconfiguration至UE，其中包含source eNodeB 配置的Measurement Configuration消息，用于控制UE连接态的测量过程。
2.UE根据测量结果上报Measurement Report。
3.源eNodeB根据测量报告进行切换决策。
4.当源eNodeB决定切换后，源eNodeB发出HandoverRequest消息给目标eNodeB，通知目标eNodeB准备切换。
5.目标eNodeB进行准入判断，若判断为资源准入，再由目标eNodeB依据EPS的QoS信息执行准入控制。
6.目标eNodeB在L1/L2准备切换并对源eNodeB发送HANDOVER REQUESTACKNOWLEDGE消息。
1.2 报告配置(A1至A5 B1至B2)事件触发上报是3GPP 36.331协议中为切换测量与判决定义的一个概念。
报告配置包含相应事件的相关参数。
目前eNodeB应用以下事件触发相应动作：●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。
LTE A1-A5 B1-B2事件
LTE支持的切换事件有A类和B类，其中A类被用作系统内测量，B类被用作系统间测量B1：邻小区比绝对门限好。
用于测量高优先级的RAT小区B2：服务小区比绝对门限1差，邻小区比绝对门限2好，用于相同或者低优先级的RAT 小区的测量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同频系统的事件和不同系统间的事件：同频切换报告事件包括：1. 事件A1，服务小区好于绝对门限；这个事件可以用来关闭某些小区间的测量。
2. 事件A2，服务小区差于绝对门限；这个事件可以用来开启某些小区间的测量，因为这个事件发生后可能发生切换等操作。
3. 事件A3，邻区好于服务小区；这个事件发生可以用来决定UE是否切换到邻区4. 事件A4，邻区好于绝对门限；5. 事件A5，服务小区差于一个绝对门限并且邻区好于一个绝对门限；这个事件也可以用来支持切换Intra-Frequency-HO切换都是基于A3/A5事件进行的切换A3事件：邻区的服务质量（RSRP/RSRQ）比服务小区高一个绝对门限，触发A3事件切换。
A5事件：服务小区的服务质量低于一个绝对门限1，邻区的服务质量高于一个绝对门限2，触发A5事件切换。
1.A3或A5事件触发。
2.Source eNB 向UE发送mearsurement control 4q;d6C1[1m+_,M+N1j:l3.Source eNB 向UE发送UL allocation MSG4.UE向Source eNB发送Measurement report MSG5.Source eNB内部进行HO decision6.Source eNB向Target eNB发送Handover request MSG7.Target eNB内部进行Admission controlMSCBSC 移动通信论坛,x"w3Q)j'V8.Target eNB向Source eNB回复Handover request ack MSG 9.Source eNB向UE回复DL allocation MSG10.Source eNB向UE发送RRC Connection reconfiguration MSGMSCBSC 移动通信论坛.k)C1b7\)C+x7W(j11.UE与Source eNB进行Detach，并开始同步到Target eNB12.Source eNB进行缓存控制并向Target eNB传送数据包以及进行SN status transfer （序列数转移）13.Source eNB向Target eNB进行数据转移传送"T/`2L4F [:u*v14.UE与Target eNB同步完成MSCBSC 移动通信论坛$b1e3x3~"X G8A15.Target eNB向UE发送UL Allocation+TA UE MSG16.UE向Target eNB发送RRC connection complete MSG 17.UE与Target eNB，Target eNB与S-GW之间进行数据交互;Q:u5O&m)F1h18.Target eNB向MME发起Path switch request 19.MME向S-GW发起user plane update requestMSCBSC 移动通信论坛!w!P,U5c5}3T5y9H20.S-GW与Source eNB进行Switch DL Path，并发起End marker MSGmscbsc 移动通信论坛拥有30万通信专业人员，超过50万份GSM/3G等通信技术资料，是国内领先专注于通信技术和通信人生活的社区。
LTE常见事件以及解析
名称含义具体说明AttachAttempt 附着尝试UE发送Attach Request消息请求附着到数据业务。
AttachSuc 附着成功UE发送Attach Request消息后，在45秒内发送Attach Complete消息，表示附着数据业务成功。
AttachFail 附着失败UE发送Attach Request消息后，在45秒内未发送Attach Complete消息，表示附着数据业务失败。
DetachAttempt 去附着尝试UE发送Detach Request消息或基站发送Detach Request消息请求去附着到数据业务。
DetachSuc 去附着成功"以下情况表示UE去附着数据业务成功：UE向基站发送Detach Request消息后，在15秒内收到基站发出的Detach Accept消息。
基站向UE发送Detach Request消息后，在15秒内收到UE发出的Detach Accept消息" RRCSetupReq RRC（Radio Resource Control）连接建立请求UE 发送RRC Connection Request消息请求建立RRC连接。
RRCSetupSuc RRC连接建立成功MS发出RRC Connection Request，并且内UE发出RRC Connection Setup Complete，则触发该事件。
RRCSetupFail RRC连接建立失败MS发出RRC Connection Request，并且内UE没有发出RRC Connection Setup Complete，或者收到RRC Connection Reject，则触发该事件。
ERABSetupAttempt ERAB（Evolved Radio Access Bearer）建立尝试如果RRC Connection Reconfiguration消息中包含特定的信元（“drb-ToAddModList”或“drb-ToAddModifyList”），并且不包含信元“mobilityControlInfo”，表示ERAB建立尝试。
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。
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
AB事件LTE
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。
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中各事件定义与应用
L T E中各事件定义与应用 This model paper was revised by the Standardization Office on December 10, 2020Event A1 (Serving becomes better than threshold)：表示服务小区信号质量高于一定门限，满足此条件的事件被上报时，eNodeB停止异频/异系统测量；类似于UMTS里面的2F事件；Event A2 (Serving becomes worse than threshold)：表示服务小区信号质量低于一定门限，满足此条件的事件被上报时，eNodeB启动异频/异系统测量；类似于UMTS里面的2D事件；Event A3 (Neighbour becomes offset better than serving)：表示同频邻区质量高于服务小区质量，满足此条件的事件被上报时，源eNodeB启动同频切换请求；Event A4 (Neighbour becomes better than threshold)：表示异频邻区质量高于一定门限量，满足此条件的事件被上报时，源eNodeB启动异频切换请求；Event A5 (Serving becomes worse than threshold1 and neighbour becomes better than threshold2)：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；类似于UMTS里的2B事件；Event B1 (Inter RAT neighbour becomes better than threshold)：表示异系统邻区质量高于一定门限，满足此条件事件被上报时，源eNodeB启动异系统切换请求；类似于UMTS里的3C事件；Event B2 (Serving becomes worse than threshold1 and inter RAT neighbour becomes better than threshold2)：表示服务小区质量低于一定门限并且异系统邻区质量高于一定门限，类似于UMTS里进行异系统切换的3A事件。
LTE系统事件简介
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 theinter-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 dividedby -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.Thresh1 is expressed in the same unit as Mp. Thresh2 is expressed in the same unit as Mn.。
LTE系统内测量事件
1.1.1 系统内测量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 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）。
A1-B2事件 (LTE)
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)1最小接入电平基本信息参数名称(中文)参数名称(英文)取值范围单位最小接收电平QrxLevMin LTE (-140 (44)3G (-119 (25)2G (-115 (25)dBm缺省值开局建议值配置步长参数类型LTE:-1403G邻区频点:-119 2G邻区频点:-115LTE:-1223G:-1192G:-1152长整型影响范围修改生效方式参数出处适用制式LTE小区2G/3G邻区频点修改立即生效3GPP TS 36.331通用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。
A1-B2事件 (LTE)
LTE支持的切换事件有A类和B类，其中A类本用作系统测量，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)1最小接入电平基本信息参数名称(中文)参数名称(英文)取值围单位最小接收电平QrxLevMin LTE (-140 (44)3G (-119 (25)2G (-115 (25)dBm缺省值开局建议值配置步长参数类型LTE:-1403G邻区频点:-119 2G邻区频点:-115LTE:-1223G:-1192G:-1152长整型影响围修改生效方式参数出处适用制式LTE小区2G/3G邻区频点修改立即生效3GPP TS 36.331通用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值在一定时间高于该阀值(threshXHigh)后，UE可以重选到该小区。
A1-B2事件 (LTE)
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)1最小接入电平基本信息参数名称(中文)参数名称(英文)取值范围单位最小接收电平QrxLevMin LTE (-140 (44)3G (-119 (25)2G (-115 (25)dBm缺省值开局建议值配置步长参数类型LTE:-1403G邻区频点:-119 2G邻区频点:-115LTE:-1223G:-1192G:-1152长整型影响范围修改生效方式参数出处适用制式LTE小区2G/3G邻区频点修改立即生效3GPP TS 36.331通用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。
A1-B2事件 (LTE)
LTE支援的切换事变有A类战B类，其中A类原用做系统内丈量，B类被用做系统间丈量之阳早格格创做A1事变：表示服务小区旗号品量下于一定门限；A2事变：表示服务小区旗号品量矮于一定门限；A3事变：表示邻区品量下于服务小区品量，用于共频、同频的鉴于覆盖的切换； A4事变：表示邻区品量下于一定门限，用于鉴于背荷的切换，可用于背载均衡；A5事变：表示服务小区品量矮于一定门限而且邻区品量下于一定门限，可用于背载均衡; 同系统丈量事变：B1事变：邻小区品量下于一定门限，用于丈量下劣先级的同系统小区；B2事变：服务小区品量矮于一定门限，而且邻小区品量下于一定门限，用于相共或者较矮劣先级的同系统小区的丈量.LTE移动性参数(齐部)最小交进电仄基原疑息参数功能该参数表示UE正在该小区驻留需谦脚的最小交支电仄门限.该值与值范畴是2G/3G交支电仄的本量值，对付于LTE/3G , 本量的RxlevMin 等于SIB3/SIB6的IE value的二倍，安排步少为2dbm.对付于2G，本量的RxlevMin等于SIB7的 (IE value *2) 115，安排步少为2dBm当UE丈量到的2G/3G电仄谦脚S规则时，UE才大概驻留正在该小区.参数安排效率安排该参数的门限值，会对付小区的采用战驻留有所效率.QrxLevMin如果树坐过下，则UE将无法驻留到该小区.下劣先级沉选门限基原疑息参数称呼(华文)参数称呼(英文)与值范畴单位下劣先级沉选门限threshXHigh0…62dBm缺省值开局提议值摆设步少参数典型442少整型效率范畴建改死效办法参数出处适用造式LTE/2G/3G邻区频面建改坐时死效通用参数功能当下劣先级小区的S值正在一定时间内下于该阀值(threshXHigh)后，UE不妨沉选到该小区.参数安排效率安排该参数的门限值，会对付小区的采用战驻留有所效率.threshXhigh如果树坐过下，会减少UE沉选到下劣先级小区的易度.矮劣先级沉选门限基原疑息参数功能当矮劣先级小区的S值正在一定时间内下于该阀值(threshXLow)后，共时主服务小区的S值矮于threshServingLow，UE不妨沉选到该矮劣先级小区.参数安排效率安排该参数的门限值，会对付小区的采用战驻留有所效率.threshXLow如果树坐过下，会减少UE沉选到矮劣先级小区的易度.小区沉选劣先级基原疑息参数功能cellreselectionPriority是对付应频面的小区沉选劣先级.参数安排效率安排该参数会曲交效率小区沉选，提议将LTE频面对付应的cellreselectionpriority树坐为7，脆持LTE频面为最下劣先级.Event A1参数A1事变鉴于RSRP主触收门限基原疑息参数功能原参数定义A1事变的主触收门限.参数安排效率当服务小区丈量电仄大于此门限时，开用A1丈量，用于探测覆盖条件较佳的地区.注意此参数仅当triggerQuantityA2Prim树坐为RSRP时才会死效.Event A2 波及参数A2事变鉴于RSRP主触收门限基原疑息参数功能原参数定义A2事变的主触收门限.参数安排效率当服务小区丈量电仄小于此门限时，开用A2丈量，用于探测覆盖条件较好的地区.Event A3 波及参数A3事变触收偏偏置果子基原疑息参数功能原参数定义A3事变触收时，服务小区的丈量电仄的偏偏置量.参数安排效率与hysteresisA3共共效率，当丈量小区的RSRP比服务小区的RSRP值下(hysteresisA3+a3Offset)时触收A3丈量报告.简曲摆设需根据搜集情况决定，如期视一个小区提前背另一小区举止切换，可将原参数树坐的较小，但是如果hysteresisA3>a3Offset则简单引起乒乓切换.A3事变触收早滞果子基原疑息参数功能原参数定义A3事变触收时，邻小区小区的丈量电仄的早滞量.参数安排效率A3事变触收偏偏置果子小区别量(CIO)基原疑息参数功能原参数定义A3事变触收时，某一对付邻区闭系之间的偏偏置果子.参数安排效率为预防过多的掉线，提议cellIndividualOffsetEUtran+hysteresisA3+ A3offset小于6dB.如果一个小区的覆盖范畴内下止SINR很好，则提议cellIndividualOffsetEUtran摆设较小值或者设为0.A3事变触收持绝时间基原疑息参数功能原参数定义触收A3事变时，达到触收所需要的电仄门限后需要持绝的时间.参数安排效率参数树坐过大没有简单开用A3丈量，会引导掉线率降下，参数树坐过小一再开用A3丈量会引导乒乓切换.A3事变触收典型基原疑息参数功能原参数定义A3事变的触收典型，为RSRP或者RSRQ.参数安排效率可根据搜集本量情况采用A3事变的触收典型.Event A4 波及参数A4事变鉴于RSRP的主触收门限基原疑息参数功能原参数定义A4事变的触收门限.参数安排效率当邻小区丈量电仄下于此门限时，开用A4丈量，主要用于同频丈量以及背载均衡功能的丈量等.Event A5 波及参数A5事变鉴于RSRP的主触收门限1基原疑息参数功能原参数定义A5事变的触收门限1.参数安排效率针对付服务小区的门限，服务小区丈量电仄小于此门限时，继承丈量邻小区电仄.A5事变鉴于RSRP的主触收门限2基原疑息参数功能原参数定义A5事变的触收门限2.参数安排效率针对付邻小区的门限，服务小区丈量电仄小于门限1时，邻小区电仄大于此门限.原参数与A5Threshold1Rsrp协共安排，分离搜集本量情况决定A5事变的触收位子战时间. Event B2 波及参数B2事变鉴于RSRP的主触收门限2(3G)基原疑息参数功能IRAT 到3G的B2事变的触收条件之一，主服务小区的电仄需下于b2Threshold2RscpUtra.参数安排效率安排该参数不妨改变B2事变对付于3G小区的覆盖电仄的央供.提议根据现网LTE战3G的覆盖去安排相映的门限值，落矮该门限值树坐会使LTE用户更简单通过沉定背或者切换的办法IRAT到3G搜集中，但是树坐过矮也大概会效率到LTE/3G互支配的乐成率.B2事变鉴于RSRP的主触收门限1基原疑息参数功能IRAT到2G/3GB2事变的触收条件之一，主服务小区的电仄需下于b2Threshold1Rsrp.参数安排效率安排该参数不妨改变B2事变对付于主服务小区的覆盖电仄的央供.提议根据现网LTE的覆盖去安排相映的门限值，普及该门限值树坐会使LTE用户更简单通过沉定背或者切换的办法IRAT到2G/3G搜集中.B2事变鉴于RSRP的主触收门限2(2G)基原疑息参数功能IRAT 到2G的B2事变的触收条件之一，主服务小区的电仄需下于b2Threshold2Geran.参数安排效率安排该参数不妨改变B2事变对付于2G小区的覆盖电仄的央供.提议根据现网LTE战2G的覆盖去安排相映的门限值，落矮该门限值树坐会使LTE用户更简单通过沉定背或者切换的办法IRAT到2G搜集中，但是树坐过矮也大概会效率到LTE/2G互支配的乐成率.。
LTE事件解释
1 4.5.1 切换正常流程同频切换同时支撑同eNodeB切换,同MME的异eNodeB切换,跨MME的异eNodeB切换场景.对于后两种场景根据eNodeB间是否树立X2接口,切换信令流程略有不合.图42 同MME异eNodeB间切换流程同MME异eNodeB间的同频切换信令流程如图42所示：1. 在无线承载树立时,源eNodeB下发RRC ConnectionReconfiguration至UE,个中包含source eNodeB 设置装备摆设的Measurement Configuration新闻,用于掌握UE衔接态的测量进程.2. UE根据测量成果上报Measurement Report.3. 源eNodeB根据测量陈述进行切换决议计划.4. 当源eNodeB决议切换后,源eNodeB发出HandoverRequest新闻给目的eNodeB,通知目的eNodeB预备切换.5. 目的eNodeB进行准入断定,若断定为资本准入,再由目的eNodeB根据EPS的QoS信息履行准入掌握.6. 目的eNodeB在L1/L2预备切换并对源eNodeB发送HANDOVER REQUEST ACKNOWLEDGE新闻.3.1.2 陈述设置装备摆设事宜触发上报是3GPP 36.331协定中为切换测量与判决界说的一个概念.陈述设置装备摆设包含响应事宜的相干参数.今朝eNodeB 运用以下事宜触发响应动作：事宜A1暗示办事小区质量高于必定门限,当知足事宜触发前提时UE便上报测量陈述,eNodeB停滞异频/异体系测量.但在基于频率优先级的切换中,事宜A1用于启动异频测量.事宜A2暗示办事小区质量低于必定门限,当知足事宜触发前提时UE便上报测量陈述,eNodeB启动异频/异体系测量.但在基于频率优先级的切换中,事宜A2用于停滞异频测量.事宜A3暗示同频/异频邻区质量比拟办事小区质量凌驾必定门限,当知足事宜触发前提的小区信息被上报时,源eNodeB启动同频/异频切换要求.事宜A4暗示异频邻区质量高于必定门限,知足事宜触发前提的小区信息被上报时,源eNodeB启动异频切换要求.事宜A5暗示办事小区质量低于必定门限,同时异频邻区质量高于必定门限,知足事宜触发前提的小区信息被上报时,源eNodeB启动异频切换要求.事宜B1暗示异体系邻区质量高于必定门限,知足事宜触发前提的小区信息被上报时,源eNodeB启动异体系切换要求.事宜B2暗示办事小区质量低于必定门限,同时异体系邻区质量高于必定门限,知足事宜触发前提的小区信息被上报时,源eNodeB 启动异体系切换要求.事宜转周期上报事宜被触发并上报之后将转为周期上报知足该事宜的测量信息,此方法称为事宜转周期上报.UE的测量成果经由过程事宜转周期的方法上报给eNodeB.周期上报将在事宜撤消前提知足或达到最大上报次数或UE收到切换敕令后后撤消.事宜转周期上报方法有如下感化：可有用防止因测量陈述的遗掉或内部处理流程的掉败对切换造成影响.对于准入谢绝,可以起到重试的感化.测量陈述中,邻区可能一次报不完.并且跟着UE的移动,会上报不合的邻区,经由过程事宜转周期可以得到比较完全的测量成果.4.2.2 事宜A3的触发（LST INTRAFREQHOGROUP）同频切换经由过程事宜A3触发,且事宜上报方法采取事宜转周期的上报方法.事宜A3的触发,即邻区质量高于办事小区必定偏置值.参照3GPP 协定36.331划定事宜A3的判决公式.触发前提：Mn+Ofn+OcnHys>Ms+Ofs+Ocs+Off公式中的变量有如下界说：Mn是邻区测量成果.Ofn是邻区频率的特定频率偏置,由参数QoffsetFreq决议,此参数在测量掌握新闻的测量对象中下发.Ocn是邻区的特定小区偏置,由参数CellSpecificOffset决议.此参数在测量掌握新闻中下发.Hys是事宜A3迟滞参数,由参数IntraFreqHoA3Hyst决议,在测量掌握新闻中下发.Off是事宜A3偏置参数,由参数IntraFreqHoA3Offset决议.该参数针对事宜A3设置,用于调节切换的难易程度,该值与测量值相加用于事宜触发和撤消的评估.此参数在测量掌握新闻的测量对象中下发,可取正值或负值,当取正值时,此时增长事宜触发的难度,延缓切换;当取负值时,此时下降事宜触发的难度,提进步行切换.事宜A2触发异频测量（LST INTERFREQHOGROUP）在基于笼罩的异频切换中,事宜A2用于异频测量的触发,暗示办事小区的质量已经低于必定门限值.当事宜A2知足上报前提并上报eNodeB后,将触发异频测量设置装备摆设的下发.3GPP TS 36.331中,事宜A2的判决公式如下.触发前提：Ms+Hys<Thresh公式中的变量由如下界说：Ms是办事小区的测量成果.Hys是事宜A2迟滞参数,由参数InterFreqHoA1A2Hyst决议.事宜A1停滞异频测量在基于笼罩的异频切换中,事宜A1用于停滞异频测量,暗示办事小区的质量已经高于必定门限值.当事宜A1知足上报前提并上报eNodeB后,将触发异频测量的停滞.3GPP协定36.331中事宜A1的判决公式如下.触发前提：MsHys>Thresh公式中的变量由如下界说：Ms是办事小区的测量成果.Hys是事宜A1迟滞参数,由参数InterFreqHoA1A2Hyst决议.事宜A4的触发事宜A4的触发,即邻区质量高于必定门限值.参照3GPP协定36.331划定的事宜A4判决公式如下.触发前提：Mn+Ofn+OcnHys>Thresh公式中的变量有如下界说：Mn是邻区测量成果.Ofn是邻区频率的特定频率偏置,由参数QoffsetFreq决议,此参数在测量掌握新闻的测量对象中下发.Ocn是邻区的特定小区偏置,由参数CellIndividualOffset决议.当该值不为零,此参数在测量掌握新闻中下发;不然当该值为零时不下发,公式盘算时默认取值为0.Hys是事宜A4迟滞参数,由参数InterFreqHoA4Hyst决议,在测量掌握新闻中下发.事宜A4的时光迟滞由参数InterFreqHoA4TimeToTrig设置.邻区质量在Time toTrigger（InterFreqHoA4TimeToTrig）的时光内一向高于任一门限值,并知足事宜的上报前提,将上报事宜A4.3.3.3 切换掉败后的RRC衔接重建当切换掉败后,UE将主动进行RRC衔接重建：UE先辈行小区选择,再对所选小区提议RRC衔接重建进程.eNodeB经由过程断定是否有该UE的context,对提议RRC衔接重建要求的UE进行重建判决.若UE获得eNodeB侧准许新闻,UE将接入所选择小区,有用削减因为切换掉败而带来的掉落话.按照3GPP协定36.331,只有prepared cell才可能有该UE的高低文,prepared cell所属的eNodeB经由过程断定该UE高低文内容,准许UE的RRC衔接重建要求,其他小区对其RRC衔接重建要求进行谢绝.5.3.1 RRC衔接重建触发前提UE在如下几种情形会触发RRC衔接重建：检测到无线链路掉败切换掉败从EUTRAN向异体系收集切换掉败时从底层收到了完全性检讨掉败指导RRC衔接重设置装备摆设掉败在知足如下任一前提时,UE以为检测到无线链路掉败：准时器T310超时随机接入掉败且准时器T300.T301.T304（T304ForEutran.T304F orGeran）或者T311都未运行时RLC达到最大重传次数RRC衔接重建成功后,SRB1可以被恢复,其他无线承载不进行恢复. eNodeB处理RRC衔接重建将会重设置装备摆设SRB1,着从新开端此无线承载上的数据传输.准时器 310MO UE准时器常量信息参数 ID T310准时器 310参数名称所属网元eNodeB所属敕令MOD UETIMERCONSTLST UETIMERCONST寄义该参数暗示准时器310的时长,拜见3GPP TS 36.331.UE在检测到物理层故障时,启动该准时器.在准时器超时前,假如UE检测到物理层故障恢复,或者触发切换流程,或者UE提议衔接重建流程,则停滞该准时器.准时器超时后,假如没有激活安然模式,UE进入RRC_IDLE态;不然,提议准时器 300体系内切换T304准时器1 准时器 3115.3.2 RRC衔接重建流程RRC衔接重建进程如图54所示.图54 RRC衔接重建流程图步调 1 UE发送RRC Connection Reestablishment Request新闻.根据不合的场景,新闻中携带的重建原因与小区信息不合.−重设置装备摆设掉败触发的重建原因为“reconfigurationFailure”,个中的CRNTI和physCellId为本小区信息.−切换掉败触发的重建原因为“handoverFailure”,个中的CRNTI和physCellId为源小区的信息.−无线链路掉败触发的重建原因为“otherFailure”,个中的CRNTI和physCellId为本小区信息.步调 2 eNodeB进行安然参数认证,假如UE的安然参数认证信息与eNodeB的一致,则UE认证经由过程.UE身份认证后,eNodeB将原资本释放,从新进行准入和资本分派.假如UE认证不经由过程,则eNodeB谢绝该UE此次的RRC衔接重建要求.步调 3 eNodeB在CCCH信道上向UE发送RRC Connection Reestablishment新闻,新闻中携带新分派资本的信息.UE收到RRC Connection Reestablishment新闻,根据新闻指导从新设置装备摆设无线资本,激活加密和完全性呵护.步调 4 UE发送RRC Connection Reestablishment Complete新闻给eNodeB.3.2 小区选择与重选当UE选择了一个PLMN之后,就会在该PLMN中选择一个小区驻留.UE在该小区驻留后,经由过程监听体系新闻,根据邻区测量规矩和小区重选规矩,对当前小区以及邻区进行测量,选择一个旌旗灯号质量更好的小区进行驻留.小区选择与小区重选流程如图32所示,小区选择可以采取Stored Information Cell Selection和Initial Cell Selection两种方法,先采取Stored Information Cell Selection选择小区,假如搜刮不到suitable cell时,则启用Initial Cell Selection 进行小区选择.具体请拜见3GPP TS 36.304.图32 小区选择与小区重选流程图3.2.2 小区选择当UE从衔接态转移到余暇态时,或当UE选择一个PLMN后,都须要进行小区选择,选择一个小区驻留.当UE从衔接态转移到余暇态时,UE将会选择在衔接态中的最后一个小区驻留,或者根据在RRC Connection Release信息平分派的频率选择Suitable Cell驻留.若没有知足以上前提的小区,则采取Stored Information Cell Selection选择小区,查找Suitable Cell驻留.搜刮不到suitable cell时,则启用Initial Cell Selection进行小区选择.Stored Information Cell SelectionQrxlevminQqualmin,UE才干够选择该小区驻留.小区选择规矩的判决公式为：Srxlev>0个中：Srxlev= Qrxlevmeas(Qrxlevmin+ Qrxlevminoffset) PcompensationQrxlevmeas：测量得到的小区吸收旌旗灯号电平值,即RSRP.单位为dBm.Qrxlevmin：在eNodeB中设置装备摆设的小区最低吸收电平值.单位为dBm.Qrxlevminoffset：小区最小吸收旌旗灯号电平偏置值.这个参数只有在UE测验测验更高优先级PLMN的小区时才用到,就是当UE 驻留在VPLMN的小区时,将根据更高优先级PLMN的小区留给它的这个参数值,来进行小区选择判决.Pcompensation：max(PMax – UE Maximum OutputPower,0),单位为dB.PMax：小区许可UE的最大发射功率,用在小区上行发射旌旗灯号进程中.单位为dBm.UE Maximum OutputPower：UE本身的最大射频输出功率.单位为dBm.Qqualmeas：测量得到的小区吸收旌旗灯号质量,即RSRQ.单位为dB.Qqualmin：在eNodeB中设置装备摆设的小区最低吸收旌旗灯号质量值.单位为dB.QQualminoffset：小区最小吸收旌旗灯号质量偏置值.这个参数只有在UE测验测验更高优先级PLMN的小区时才用到,就是当UE驻留在VPLMN的小区时,将根据更高优先级PLMN的小区留给它的这个参数值,来进行小区选择判决.。
LTE常用事件详解
CSFBServiceFail
InterRATHOCmd InterRATHOSuc InterRATHOFail InterRATRedirectionReq InterRATRedirectionSuc InterRATRedirectionFail
RandomAccess
随机接入事件
给出的说明并进行相应的操作。 具体说明 UE发送Attach Request消息请求附着到数据业务。 UE发送Attach Request消息后，在45秒内发送Attach Complete消息，表示附着数据业务成功。 UE发送Attach Request消息后，在45秒内未发送Attach Complete消息，表示附着数据业务失败。 UE发送Detach Request消息或基站发送Detach Request 消息请求去附着到数据业务。 以下情况表示UE去附着数据业务成功： UE向基站发送Detach Request消息后，在15秒内收到 基站发出的Detach Accept消息。 基站向UE发送Detach Request消息后，在15秒内收到 UE发出的Detach Accept消息。 UE发送RRC Connection Request消息请求建立RRC连接。
MS发出RRC Connection Request，并且2.5s内UE发出RRC Connection Setup Complete，则触发该事件。 MS发出RRC Connection Request，并且2.5s内UE没有发 出RRC Connection Setup Complete，或者收到RRC Connection Reject，则触发该事件。 如果RRC Connection Reconfiguration消息中包含特定 的信元（“drb-ToAddModList”或“drbToAddModifyList”），并且不包含信元“ mobilityControlInfo”，表示ERAB建立尝试。 ERABSetupAttempt事件发生后，UE在1秒内收到RRC Connection Reconfiguration Complete消息，并且消息 中的信元“RRC-TransactionIdentifier”值与信元“ RRC Connection Reconfiguration”信元值相同，则表 示ERAB建立成功。 以下情况表示ERAB建立失败： ERABSetupAttempt事件发生后，1秒内UE没有收到RRC Connection Reconfiguration Complete消息。 ERABSetupAttempt事件发生后，UE收到 RRCConnectionReestablishmentRequest消息。 以下情况表示ERAB正常释放： UE收到Deactivate Eps Bearer Context Request消 息后，收到了RRC Connection Reconfiguration消 息，且消息中有信元“drb-ToReleaseList”。 UE收到Deactivate Eps Bearer Context Request消 息后，收到了RRC Connection release消息。 UE收到MME的DETACH REQUEST消息，或者向网络侧主 动发出DETACH REQUEST消息后收到RRC release消息
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
9.
✍事件eNodeB ✍事件eNodeB ✍事件
✍事件启✍事件
✍事件eNodeB ✍事件。
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Ø Event A1 (Serving becomes better than threshold)：表示服务小区信号质量高于一定门限，满足此条件的事件被上报时，eNodeB停止异频/异系统测量；类似于UMTS里面的2F事件；
ØEvent A2 (Serving becomes worse than threshold)：表示服务小区信号质量低于一定门限，满足此条件的事件被上报时，eNodeB启动异频/异系统测量；类似于UMTS里面的2D事件；
ØEvent A3 (Neighbour becomes offset better than serving)：表示同频邻区质量高于服务小区质量，满足此条件的事件被上报时，源eNodeB启动同频切换请求；
ØEvent A4 (Neighbour becomes better than threshold)：表示异频邻区质量高于一定门限量，满足此条件的事件被上报时，源eNodeB启动异频切换请求；
ØEvent A5 (Serving becomes worse than threshold1 and neighbour becomes better than threshold2)：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；类似于UMTS里的2B事件；
ØEvent B1 (Inter RAT neighbour becomes better than threshold)：表示异系统邻区质量高于一定门限，满足此条件事件被上报时，源eNodeB启动异系统切换请求；类似于UMTS里的3C 事件；
ØEvent B2 (Serving becomes worse than threshold1 and inter RAT neighbour becomes better than threshold2)：表示服务小区质量低于一定门限并且异系统邻区质量高于一定门限，类似于UMTS里进行异系统切换的3A事件。
从定义上就可以看出来，A5和B2的条件最苛刻，必须满足服务小区低于某绝对门限，同时邻区高于某绝对门限才会上报。
而A3只是邻区比服务小区强某个相对门限时就会上报。
A4和B1只对邻区作判断，A1和A2只是对服务小区作判断。
因为在实际应用中，A3通常用于同频切换。
原因是同频测量在任何时刻都可以进行，而异频和异系统测量需要配置GAP，在GAP周期内，只测量邻区，不测量服务小区。
不同的厂家有不同的算法，我了解的是同频用A3，如果上报A2，再配置A4或B1，如果上报了A4和B1，就会触发异频或异系统切换(或重定向），如果没上报A4或B1，上报了A1，就会删除A4和B1。
这个算法的原则就是，尽量简化UE的测量内容，先测同频，同频切换该切就切，如果在这种情况下服务小区变差，说明同频覆盖有问题，就要配置异频或异系统测量，配置GAP，如果服务小区变好了，就删除异频或异系统测量，取消GAP。