rrc建立請求有多重原因。
建立原因如下：
Originating Conversational Call,
Originating Streaming Call,
Originating Interactive Call,
Originating Background Call,
Originating Subscribed traffic Call,
Terminating Conversational Call,
Terminating Streaming Call,
Terminating Interactive Call,
Terminating Background Call,
Emergency Call,
Inter-RAT cell re-selection,
Inter-RAT cell change order,
Registration, Detach,
Originating High Priority Signalling,
Originating Low Priority Signalling,
Call re-establishment,
Terminating High Priority Signalling,
Terminating Low Priority Signalling,
Terminating - cause unknown,
MBMS reception,
MBMS ptp RB request,



主叫交互類一般是指RRC建立原因為Originating Interactive Call，后續(xù)發(fā)起RAB建立。通常RAB指派會攜帶4種業(yè)務類型。
conversation,steram,interactive,background.

排查方法無固定方法，根據(jù)具體失敗原因排查，一般都是空口問題或者小區(qū)擁塞。
如果2,3小區(qū)都是正常的，需要查看小區(qū)1與其他小區(qū)的參數(shù)是否相同，業(yè)務量是否基本相等。