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善于提问，勤于回答，你也是专家
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提问者: • 基于覆盖的异频和异系统切换，eNodeB都是A2事件来触发或停止异频和异系统的测量 2016-11-24
• 华为LTE测试时信令中的A2事件如何区分属于异频还是异系统测量 2016-03-17
• LTE网络现网设置，A1事件判决门限为-90dbm，A2事件判决为-105dbm，这样设置A1、A2是不是设的都有点低？ 2015-09-18
• LTE-A2事件解读 2015-05-18
• LTE中A2事件的迟滞参数理解? 2015-04-19
• 求教A1事件和A2事件的关系？ 2015-04-19
5.5.4.3 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 specified below, is fulfilled;
1> consider the leaving condition for this event to be satisfied when condition A2-2, as specified below, is fulfilled;
1> for this measurement, consider the primary or secondary cell that is configured on the frequency indicated in the associated measObjectEUTRA to be the serving cell;
Inequality A2-1 (Entering condition)
Inequality A2-2 (Leaving condition)
The 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.
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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。
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A2事件：服务小区质量低于某个阈值，启动异频/异系统测量。
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LTE 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的2D事件。
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事件A2，服務社區差於絕對門限；這個事件可以用來開啟某些小區間的測量，因為這個 事件發生後可能發生切換等操作。
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A2事件：服务小区质量低于某个阈值，启动异频/异系统测量。
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