LTE测量事件主要有下面几种：Event A1、Event A2、Event A3、Event A4、Event A5、Event B1、Event B2。
原帖：https://wenda.so.com/q/1451887876725924
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；
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/异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；一般来说是基于覆盖的切换
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；一般来说是基于负荷均衡的切换
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。