【資料名稱】：CS域的掉話以及分析說明

【資料作者】：網(wǎng)管

【資料日期】：2011

【資料語言】：中文

【資料格式】：DOC

【資料目錄和簡介】：

掉話率指標的獲取有路測和后臺網(wǎng)管統(tǒng)計兩種途徑。路測指標主要通過測試工具獲取，而網(wǎng)管統(tǒng)計指標是對海量數(shù)據(jù)的分析得到。首先介紹正常的通話釋放信令流程。
2.1 用戶主動釋放信令
Uu口信令如下：

圖 2.1 1UE主動釋放信令流程圖

圖 2.1 2放大圖
2.2 路測指標定義
路測指標定義和測試工具關系緊密，CNT/CNA中對單業(yè)務掉話的定義算法為：
掉話率 ＝ 掉話次數(shù)/呼叫成功建立次數(shù)
收到"Alerting"消息后, 呼叫成功建立次數(shù)加1；
在Alerting之后，沒有收到Connect ACK就收到SYSTEM INFORMATION消息，則算掉話；
在Connect ACK之后，若收到SYSTEM INFORMATION消息，而后的5秒內沒有收到E_S_radioBearerReconfigurationComplete，E_S_physicalChannelReconfigurationComplete，E_S_transportChannelReconfigurationComplete， E_S_rrcConnectionRelease， E_S_rrcConnectionRelease_CCCH消息，則認為掉話；
在Connect ACK之后，若收到E_S_rrcConnectionRelease，E_S_rrcConnectionRelease_CCCH消息，而在此之前沒有收到Disconnect消息，則認為掉話。
在實際使用中，工具會在L3消息中顯示掉話位置。
2.3 網(wǎng)管指標定義
網(wǎng)管統(tǒng)計的掉話定義如下：
無線掉話率＝（RNC請求釋放的電路域掉話的RAB數(shù)目
RNC請求釋放電路域Iu連接對應的RAB數(shù)目
+RNC請求釋放的分組域掉線的RAB數(shù)目
+RNC請求釋放分組域Iu連接對應的RAB數(shù)目）
/(電路域總共釋放的RAB數(shù)目
+分組域總共釋放的RAB數(shù)目）×100%
主要有信令面掉話和用戶面掉話。從信令流程上看，信令面掉話是RNC發(fā)起了Iu release request， 用戶面掉話是RNC主動發(fā)起RAB release request。
具體的掉話原因細分計數(shù)器及說明見下表（V3.07.300）。
表 2.3 1網(wǎng)管統(tǒng)計的掉話原因
釋放
類型計數(shù)器計數(shù)器說明相關原因
Iu releaseC301230315Iu connection release request by UTRAN for CS domain in cell,Repeated Integrity Checking Failure重復的完整性檢查失敗
C301230316Iu connection release request by UTRAN for CS domain in cell,Release due to UE generated signalling connection releaseUE產生的信令連接釋放
C301230317Iu connection release request by UTRAN for CS domain in cell,Radio Connection With UE Lost失去與UE的無線連接
C301230318Iu connection release request by UTRAN for CS domain in cell,TRELOCoverall expiry重定位完成定時器超時
C301230319Iu connection release request by UTRAN for CS domain in cell,Failure in the Radio Interface Procedure無線接口流程失敗
C301230320Iu connection release request by UTRAN for CS domain in cell,O&M Intervention操作維護干預
C301230321Iu connection release request by UTRAN for CS domain in cell,Release due to Overload Control過載控制導致的釋放
C301230322Iu connection release request by UTRAN for CS domain in cell,Unspecified Failure不確定失敗
C301230323Iu connection release request by UTRAN for CS domain in cell,UTRAN Generated ReasonUTRAN發(fā)起
RAB releaseC301230361RAB release number request by UTRAN in cell for CS domain,RAB pre-emptedRAB搶占
C301230362RAB release number request by UTRAN in cell for CS domain,Release due to UTRAN in cell Generated ReasonUTRAN產生的釋放原因
C301230363RAB release number request by UTRAN in cell for CS domain,Iu UP FailureIuUP失敗
C301230364RAB release number request by UTRAN in cell for CS domain,Release due to Overload Control過載控制導致的釋放
C301230365RAB release number request by UTRAN in cell for CS domain,Unspecified Failure不確定失敗