LTE_事件触发条件探索及其意义
LTE 事件触发条件探索及其意义
LTE 事件触发条件：(一)A1触发条件：UE将发送服务小区变得比门限值更好时的测量报告，事件A1被用于UELeaving-Coverage-Alarm的监控。
进入A1的条件:Ms-hysteresis＞thresholdEutraRsrp（或者thresholdEutraRsrq）离开A1的条件:Ms+hysteresis＜thresholdEutraRsrp（或者thresholdEutraRsrq）(二)A2触发条件：UE将发送服务小区变得比门限值更坏时的测量报告，事件A2被用于UEEnter-Coverage-Alarm或者Below-Serving-Floor的监控。
进入A2的条件:Ms+hysteresis＜thresholdEutraRsrp（或者thresholdEutraRsrq）离开A2的条件:Ms-hysteresis＞thresholdEutraRsrp（或者thresholdEutraRsrq）(三)A3触发条件：UE将发送相邻小区变得比服务小区偏移更好时的测量报告，事件A3被用于如果UE不支持事件A5配置时，触发同频HO及频间重定向HO。
进入A3的条件:Mn+offset＞Ms+hysteresis，其中offset=-eventA3offset-CIO_s-offsetfreq_s+CIO_n+offsetfreq_n离开A3的条件:Mn+offset＜Ms-hysteresis，其中offset与上式相同。
(四)A4触发条件：UE将发送相邻小区比门限更好的测量报告，事件A4主要被用于ANR测量和无功率控制。
进入A4的条件Mn+offsetfreq-hysteresis ＞thresholdEutraRsrp（或者thresholdEutraRsrq）离开A4的条件Mn+offsetfreq+hysteresis ＜thresholdEutraRsrp（或者thresholdEutraRsrq）(五)A5触发条件：UE将在服务小区变得比门限值1更差且频间邻区变得比门限2更好时，发送测量报告。
ltea3事件触发条件(一)
ltea3事件触发条件(一)ltea3事件触发条件背景介绍近日，ltea3事件引起了广泛关注。
这一事件的发生，引发了人们对网络安全的再次关注。
本文将介绍ltea3事件的相关信息，以及导致该事件发生的触发条件。
事件概述ltea3事件是一起网络安全事件，涉及到大量用户的个人信息被泄露。
据相关报道，攻击者利用了一个安全漏洞，成功获取了用户的敏感信息。
这些信息包括但不限于个人身份信息、联系方式等。
触发条件一：存在安全漏洞•在ltea3事件中，攻击者能够成功获取用户信息的主要原因是应用程序存在安全漏洞。
•这个安全漏洞可以是程序代码中的一个错误，导致攻击者能够绕过系统的安全机制。
•安全漏洞可能是由于疏忽、未经充分测试或攻击者的有意破坏行为引起的。
触发条件二：缺乏安全意识•除了存在安全漏洞外，ltea3事件的发生还与用户个人的安全意识和习惯有关。
•用户可能在注册账号时使用了容易被猜测的密码，或者未定期更改密码，造成账号被攻破。
•用户还可能没有意识到点击垃圾邮件、下载未知来源的应用等行为的风险，从而打开了攻击者的入口。
触发条件三：缺乏安全措施•除了用户个人的安全意识外，应用程序和网络平台所提供的安全措施也是防止类似事件发生的重要因素。
•如果应用程序没有及时更新漏洞补丁或者没有采用先进的加密技术，攻击者就有可能利用其进行攻击。
•同样，网络平台在处理用户数据时，如果没有采取妥善的数据加密和访问控制措施，也会存在被攻破的风险。
总结ltea3事件的发生不仅仅是一个特例，它提醒我们在网络时代保护个人信息的重要性。
触发条件一般包括存在安全漏洞、缺乏安全意识和缺乏安全措施。
为了避免个人信息泄露，我们应当加强对网络安全的认识，提高个人安全意识，同时也需要加强应用程序和网络平台的安全措施。
只有共同努力，才能创造一个更加安全可靠的网络环境。
LTE事件解释18页
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 ConnectionReconfiguration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HANDOVERREQUEST ACKNOWLEDGE消息。
3.1.2 报告配置事件触发上报是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
LTE切换事件
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。
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事件
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，邻居小区好于服务小区；这个事件发生可以用来决定UE是否切换到邻居小区。
4. 事件A4，邻居小区好于绝对门限；
5. 事件A5，服务小区差于一个绝对门限并且邻居小区好于一个绝对门限；这个事件也可以用来支持切换
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测量事件
Measurement report triggering(3GPP) Ms:服务小区测量结果Mn:邻小区测量结果Mp:主小区测量结果Ofn:邻小区特定频率偏置Ocn:邻小区小区特定偏置Ofp:主小区特定频率偏置Ocp:邻小区小区特定偏置Off:事件偏置Hys:事件迟滞参数Thresh:事件门限Mcr:参考信号测量结果Ocr:参考信号偏置Mref:参考信号参考值Oref:参考信号参考偏置Event A1 (Serving becomes better than threshold)服务小区高于一定门限触发条件:Ms -Hys > Thresh离开条件:Ms + Hys < ThreshEvent A2 (Serving becomes worse than threshold)服务小区低于一定门限触发条件:Ms + Hys < Thresh离开条件:Ms -Hys > ThreshEvent A3 (Neighbour becomes offset better than PCell/ PSCell)邻小区高于主小区触发条件:Mn+Ofn+Ocn-Hys > Mp +Ofp +Ocp +Off离开条件:Mn+Ofn+Ocn+ Hys < Mp +Ofp +Ocp +OffEvent A4 (Neighbour becomes better than threshold)邻小区高于一定门限触发条件:Mn+Ofn+Ocn-Hys > Thresh ;离开条件:Mn+Ofn+Ocn+ Hys < ThreshEvent A5 (PCell/ PSCell becomes worse than threshold1 and neighbor becomes better than threshold2)主小区低于一定门限,邻小区高于一定门限触发条件1:Mp+ Hys < Thresh1 ,触发条件2:Mn+Ofn+Ocn-Hys > Thresh2离开条件1:Mp-Hys > Thresh1 ,离开条件2:Mn+Ofn+Ocn+ Hys < Thresh2Event A6 (Neighbour becomes offset better than SCell)邻小区高于辅小区触发条件:Mn + Ocn - Hys > Ms +Ocs +Off离开条件:Mn + Ocn + Hys < Ms +Ocs +OffEvent B1 (Inter RAT neighbour becomes better than threshold)异系统邻小区高于一定门限触发条件:Mn +Ofn ? Hys > Thresh离开条件:Mn+Ofn+ Hys < ThreshEvent B2 (PCell becomes worse than threshold1 and inter RAT neighbourbecomes better than threshold2)主小区低于一定门限,异系统邻小区高于一定门限触发条件1:Mp+ Hys < Thresh1 ,触发条件2:Mn+Ofn?Hys > Thresh2离开条件1:Mp- Hys > Thresh1 ,离开条件2:Mn+Ofn+ Hys < Thresh2Event C1 (CSI-RS resource becomes better than threshold)参考信号信道质量指示高于一定门限触发条件:Mcr +Ocr -Hys > Thresh离开条件:Mcr +Ocr + Hys < ThreshEvent C2 (CSI-RS resource becomes offset better than reference CSI-RS resource)参考信号信道质量指示高于参考信号质量指示参考值触发条件:Mcr +Ocr - Hys > Mref +Oref +Off离开条件:Mcr +Ocr + Hys < Mref +Oref +Off。
lte连接态a1事件计算方法
lte连接态a1事件计算方法
LTE连接态A1事件计算方法是一种用于计算LTE网络中UE（用户终端设备）与基站之间的连接状态的方法。
该方法主要用于确定UE是否需要在特定的情况下进行连接和维持连接。
以下是一种常见的LTE连接态A1事件计算方法：
1. 确定A1事件的触发条件：A1事件通常与UE的信号强度和基站的信号质量相关。
触发A1事件的条件可以是UE的信号强度低于某个阈值，或者基站的信号质量低于某个阈值。
2. 确定A1事件的触发动作：一旦A1事件被触发，UE需要执行相应的动作来处理连接状态。
这些动作可以包括重新选择更好的基站进行连接，或者保持当前的连接状态。
3. 定义A1事件的计算方法：为了计算A1事件的触发条件，可以使用一些信号参数和门限值来进行计算。
这些参数可以包括UE的信号强度、基站的信号质量、门限值等。
4. 实施A1事件的触发和动作：一旦A1事件的触发条件满足，UE 需要执行相应的动作来处理连接状态。
这些动作可以通过与基站进行通信来实现。
需要注意的是，LTE连接态A1事件的计算方法可以根据具体的网络需求和实际情况进行调整和优化。
此外，还可以结合其他的事件和算法来进一步提高连接状态的性能和效率。
A1B优选事件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;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IEvalue的两倍，调整步长为2dbm。
对于2G，实际的RxlevMin等于SIB7的?(IEvalue*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。
threshXLow如果设置过高，?会增加UE 重选到低优先级小区的难度。
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简答题总结
1、进行宏站单站验证（优化）的目的是什么？答：单站验证是网络优化的基础性工作，其目的是保证站点各个小区的基本功能（接入、PING FTP上传下载业务等）和信号覆盖正常，保证安装、参数配置等与规划方案一致，将有可能影响到后期优化的问题在前期解决，另外还可以熟悉优化区域内的站点位置、无线环境等信息，获取实际基础资料，为更高层次的优化打下良好基础。
2、宏站单站验证（优化）需要携带的工具有哪些，分别作什么用？答:这种定义是否更严格？增加了哪些异常事件？切换成功率定义：路测时，PCI每变化一次则计算切换成功率的分母+1.终端每发出RRC recon figuration CMP 一次则计算切换成功率的分子+1。
相对与传统的切换成功率定义更加严格。
增加了RRC异常RELEASE但不在RRC异常RELEASE小区重建成功的异常事件。
2. 某路段由某站的A/B小区覆盖，整段路上RSRP在-85dBm到-70dBm左右，但切换经常掉话，请写出分析与排查方法。
（假设此问题与产品本身无关）1）利用扫频仪测试，看是否有有本频段内其他非主覆盖小区信号（除A/B小区），尽量减少或降低非主覆盖小区的信号强度，提升主覆盖小区信号SINR.2）检查附件小区是否存在与本小区DL/UL配比不一致，如有则并纠正错误。
3）检查附件基站及本基站是否存在GPS失步，如有则反馈排障。
4）检查主覆盖小区是否与此路段信号强的邻区PCI存在M0D3相同关系。
5）查验是否存在外部干扰及其他友商同频段基站信号造成干扰。
1. 目前TD-LTE使用的8通道智能天线，在RRU和天线上各有9个端口，如果他们之间的端口没有按规范连接相互连接错误，测试时会有什么异常现象？RSRP无太多变化，SINR值有陡降现象；下载速率波动比较大，平均速率低；对上行业务速率影响不明显，SINR无陡降现象；下载数据量越大，SINR陡降越明显，不做业务或进行小数据下载SINR陡降不明显；2. 路测优化时需要关注的相关配置参数或指标，说出10个即可？（可做填空或选择）RSRP、SINR、频点、带宽、子帧配置，特殊子帧配置PCI、CQI、MCS、PRB、PUSCHpower、transmission mode、Bier 等3. 在未打开anr时如果邻区缺失，路测中会出现什么状况，通过那些信令可以判断是邻区缺失？原小区不停上发测量报告但不能切换至目标小区，RSRP和SINR逐渐变差，最终掉线。
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LTE 事件触发条件：
(一)A1触发条件：UE将发送服务小区变得比门限值更好时的测量报告，事件A1被用于UE
Leaving-Coverage-Alarm的监控。
进入A1的条件:
Ms-hysteresis＞thresholdEutraRsrp（或者thresholdEutraRsrq）
离开A1的条件:
Ms+hysteresis＜thresholdEutraRsrp（或者thresholdEutraRsrq）
(二)A2触发条件：UE将发送服务小区变得比门限值更坏时的测量报告，事件A2被用于UE
Enter-Coverage-Alarm或者Below-Serving-Floor的监控。
进入A2的条件:
Ms+hysteresis＜thresholdEutraRsrp（或者thresholdEutraRsrq）
离开A2的条件:
Ms-hysteresis＞thresholdEutraRsrp（或者thresholdEutraRsrq）
(三)A3触发条件：UE将发送相邻小区变得比服务小区偏移更好时的测量报告，事件A3被用于如果
UE不支持事件A5配置时，触发同频HO及频间重定向HO。
进入A3的条件:
Mn+offset＞Ms+hysteresis，其中offset=-eventA3offset-CIO_s-offsetfreq_s+CIO_n+offsetfreq_n
离开A3的条件:
Mn+offset＜Ms-hysteresis，其中offset与上式相同。
(四)A4触发条件：UE将发送相邻小区比门限更好的测量报告，事件A4主要被用于ANR测量和无功
率控制。
进入A4的条件
Mn+offsetfreq-hysteresis ＞thresholdEutraRsrp（或者thresholdEutraRsrq）
离开A4的条件
Mn+offsetfreq+hysteresis ＜thresholdEutraRsrp（或者thresholdEutraRsrq）
(五)A5触发条件：UE将在服务小区变得比门限值1更差且频间邻区变得比门限2更好时，发送测量
报告。
事件5用于触发频点重定向HO。
进入A5的条件
Ms+hysteresis＜thresholdEutraRsrp（或者thresholdEutraRsrq）且
Mn+offset-hysteresis＞thresholdEutra2Rsrp（或者thresholdEutra2Rsrq），其中offset=CIO_n-offsetFreq_n
离开A5的条件
Ms-hysteresis＞thresholdEutraRsrp（或者thresholdEutraRsrq）且
Mn+offset+hysteresis＜thresholdEutra2Rsrp（或者thresholdEutra2Rsrq），其中offset=CIO_n-offsetFreq_n
(六)B1触发条件：UE将RAT间相邻小区变得比门限值更好时发送测量报告，事件B1被用于LTE到
UTRAN和GERAN的CS fallback。
进入B1的条件
Mn+offsetFreqInterRAT-hysteresis＞thresholdInterRAT
离开B1的条件
Mn+offsetFreqInterRAT+hysteresis＜thresholdInterRAT
(七)B2触发条件：UE将发送服务小区变得比门限值1更差且RAT邻小区变得比门限值2更好是的测
量报告。
事件B2用于触发RAT间的移动。
进入B2的条件
Ms+hysteresis＜thresholdEutraRsrpB2（或thresholdEutraRsrqB2）且
Mn+offsetInterRAT-hysteresis＞thresholdInterRAT
离开B2的条件
Ms-hysteresis＞thresholdEutraRsrpB2（或thresholdEutraRsrqB2）且
Mn+offsetInterRAT+hysteresis＜thresholdInterRAT。