A1事件：
事件进入条件：Ms - Hys > Thresh
停止异频测量门限：Threshold th2a for RSRP(Threshold2a)
A1迟滞：Related hysteresis of threshold th2a for RSRP (hys threshold2a)
服务小区的RSRP- hys threshold2a >Threshold2a，且保持时间超过a1TimeToTriggerDeactInterMeas
的设置时间，则停止异频测量。
A2事件：
启动同频测量门限threshold1
事件进入条件：Ms + Hys < Thresh
启动异频测量门限：Threshold th2 interFreq for RSRP (threshold2InterFreq)
A2迟滞：Related hysteresis of threshold th2 interfreq for RSRP(hysThreshold2InterFreq)
打开Enable interfrequency handover:异频切换开关
Time to trigger for A2 to activate inter measurement(a2TimeToTriggerActInterFreqMeas
)
当服务小区的RSRP+ hysThreshold2InterFreq < threshold2InterFreq，且保持时间超过的设置时间 a2TimeToTriggerActInterFreqMeas，则开始异频测量 |
A3事件
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
NSN无Ofn/Ocn/Ofs/Ocs 参数
同频A3事件
同频A3迟滞：Related hysteresis of offset a3offset for RSRP intra F(hysA3Offset)
A3报告时长:A3 report interval
A3触发时延:A3 time to trigger
A3偏置:A3offset
故同频A3事件需满足：邻小区的RSRP-hysA3Offset
>服务小区的RSRP+ a3Offset，由于hysA3Offset配置为0，故A3事件的示意图如下图所示：
异频A3事件
异频A3偏置 A3 offset RSRP inter frequency
a3OffsetRsrpInterFreq
异频A3报告时长：A3 report interval RSRP inter frequency
异频A3触发时延：A3 time to trigger RSRP inter frequency
异频A3迟滞：Related hysteresis offset a3offset RSRP inter frequency hysA3OffsetRsrpInterFreq
异频A3事件满足：邻小区的RSRP—hysA3OffsetRsrpInterFreq |
>服务小区的RSRP+ a3OffsetRsrpInterFreq
A5事件：
事件进入条件：Ms + Hys < Thresh1
且 Mn + Ofn + Ocn- Hys >Threah2
诺西无Ofn/Ocn参数
同频A5事件：
Thresh1:Threshold th3 for RSRP(threshold3)
Thresh2 :Threshold th3a for RSRP( threshold3a )
A5报告时长A5 report interval
A5触发时延A5 time to trigger
A5迟滞Related hysteresis th3 and th3a for RSRP
同频A5事件满足：当服务小区的 RSRP+hysThreshold3<threshold3,且邻区RSRP- hysThreshold3>threshold3a |
由于现网中的迟滞配置为0，故只要服务小区低于threshold3，邻区高于threshold3a，并达到触发的时间，就会发生切换，其示意图如图所示：
异频A5事件：
Thresh1:Threshold th3 for RSRP inter frequency（threshold3InterFreq ）
Thresh2 :Threshold th3a for RSRP inter frequency（threshold3aInterFreq ）
A5报告时长A5 report interval inter frequency
A5触发时延A5 time to trigger inter frequency
A5迟滞Related hysteresis of thresholds th3 and th3a for RSRP（hysThreshold3InterFreq ）  同异频切换的参数配置.docx
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异频A5事件满足：
当前服务小区的RSRP+hysThreshold3interFreq< threshold3InterFreq 并满足：邻区的RSRP- hysThreshold3interFreq> threshold3aInterFreq |
A4事件：
事件进入条件：Mn + Ofn + Ocn - Hys > Thresh
通过A5事件来实现，将A5事件中的Thresh1配置一个很高的值，使Ms + Hys < Thresh1 永远成立，注意这地方的Thresh1需要小于等于异频起测门限值Threshold th2 interFreq for RSRP，只要邻区满足Mn + Ofn + Ocn - Hys > Thresh2，即可实现A4
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