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现在看不到你的计数器随机文档，我之前做的对于掉话统计P30155涉及到的9个计数器，其实可以分为两大类，一类是按原因分类的UTRAN发起的RAB释放；一类是按原因分类的UTRAN发起的Iu连接释放。
第一类：UTRAN发起的Iu连接释放，在系统中总共有10种原因：
C301230314：RAB release number for Iu connection release request by UTRAN for CS
domain in cell, User Inactivity
C301230315：RAB release number for Iu connection release request by UTRAN for CS
domain in cell, Repeated Integrity Checking Failure
C301230316：RAB release number for Iu connection release request by UTRAN for CS
domain in cell, Release due to UE generated signaling connection release
C301230317：RAB release number for Iu connection release request by UTRAN for CS
domain in cell, Radio Connection With UE Lost
C301230318：RAB release number for Iu connection release request by UTRAN for CS
domain in cell, TRELOCoverall expiry
C301230319：RAB release number for Iu connection release request by UTRAN for CS
domain in cell, Failure in the Radio Interface Flow
C301230320：RAB release number for Iu connection release request by UTRAN for CS
domain in cell,O&M Intervention
C301230321：RAB release number for Iu connection release request by UTRAN for CS
domain in cell, Release due to Overload Control
C301230322：RAB release number for Iu connection release request by UTRAN for CS
domain in cell, Unspecified Failure
C301230323：RAB release number for Iu connection release request by UTRAN for CS
domain in cell, TRAN Generated Reason
第二类：UTRAN发起的RAB释放，系统中总共有5种原因
C301230361：RAB release number request by UTRAN in cell for CS domain,RAB pre-empted
C301230362：RAB release number request by UTRAN in cell for CS domain,Release due to
UTRAN in cell Generated Reason
C301230363：RAB release number request by UTRAN in cell for CS domain,Iu UP Failure
C301230364：RAB release number request by UTRAN in cell for CS domain,Release due to
Overload Control
C301230365：RAB release number request by UTRAN in cell for CS domain,Unspecified Failure
你可以提取KPI查看RRC,RAB,以及掉话的原因值，来判断问题所在。建议你先核查参数，做baseline核查，然后后台RNC跟踪小区信令。
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