【資料名稱】:GSM信令
【資料作者】:浩杰春
【資料日期】:201110-18
【資料語言】:中文
【資料格式】:其它
【資料目錄和簡介】:
TEMS8.0:
主叫:
1、Call Initiation(MS) –>CM Service Request(MS) –>Channel Request(Call Attempt)(MS)《RACH》-> Immediate Assignment(NW)《AGCH》->Classmark Change(MS)《SDCCH》-> GPRS Suspension Request(MS) ->Authentication Request(NW)-> Authentication Response(MS)-> Ciphering Mode Command(NW)-> Ciphering Mode Complete(MS)-> Setup(MS)-> Call Proceeding(NW)-> Assignment Command(NW)-> Assignment complete(MS) -> Call Progress(NW)-> Alerting (Call Setup)(MW)->Connect(Call Established)(NW)-> Connect Acknowledge(MS)-> Disconnect(MS)-> Release(Call End)(NW)-> Release Complete(MS)-> Channel Release(NW)
2、Call Initiation(MS) -> CM Service Request ↑-> Immediate Assignment↓ ->Channel Request(Call Attempt) ↑-> Immediate Assignment↓->Classmark Change↑-> GPRS Suspension Request↑ ->Authentication Request↓-> Authentication Response↑-> Ciphering Mode Command↓-> Ciphering Mode Complete↑-> Setup↑-> Call Proceeding↓-> Assignment Command↓-> Assignment complete↑ -> Alerting (Call Setup) ↓-> Connect(Call Established) ↓-> Connect Acknowledge↑ -> Disconnect↑ -> Release(Call End) ↓-> Release Complete↑-> Channel Release↓
被叫:
Channel Request(Call Attempt)-> Immediate Assignment->
aging Response-> Classmark Change-> GPRS Suspension Request -> Authentication Request-> Authentication Response-> Ciphering Mode Command-> Ciphering Mode Complete-> Setup -> Call Confirmed-> Assignment Command-> Assignment Complete-> Alerting(Call Setup)-> Connect->Connect Acknowledge(Call Established)->Disconnect-> Release(Call End)-> Release Complete ->Channel Release
Pilot Navigator:
CM Service Request→Immediate Assignment→Classmark Change→Authentication Request→Authentication Response→Chihering Mode Command →Chihering Mode Complete →Setup →Call Proceeding →Assignment Command →Assignment complete→Alerting→Connect→Connect Acknowledge→Disconnect →Release →Release Complete →Channel Release
Blocked-Recovery on timer expiry:被叫無答應(yīng)時出現(xiàn)的信令
通話建立(MS作主叫)
信令過程說明
RR層連接建立RACH—UL:CHANNEL _REQUEST內(nèi)容:建立原因和隨機參考值(RAND)
原因:MS發(fā)起呼叫、緊急呼叫、呼叫重建和尋呼響應(yīng)等;
RAND:有5 位,用來區(qū)別不同MS所發(fā)起的請求。
AGCH—DL:IMMEDIATE_ASSINGMENT在Um接口建立MS與系統(tǒng)間的無線連接(分配SDCCH)
RR連接建立
MM層連接的建立CCCH—UL:CM SERVICE_REQUEST請求業(yè)務(wù)如電路交換連接、短信業(yè)務(wù)等
SDCCH—DL:AUTH_REQUEST鑒權(quán)請求
SDCCH—UL:AUTH_RESPONSE鑒權(quán)響應(yīng)
SDCCH—DL:CIPHERING_REQUEST加密命令
SDCCH—UL:CIPHERING_COMPLETE加密完成
CC層連接的建立SDCCH—UL:SETUP請求建立呼叫
內(nèi)容:呼叫請求的業(yè)務(wù)種類及MS發(fā)送方式、編碼標(biāo)準(zhǔn)等
SDCCH—DL:CALL _PROCEEDING系統(tǒng)接受請求后開始處理呼叫
SDCCH—DL:ALERTING振鈴音
SDCCH—DL:ASSIGNMENT_COMMAND分配TCH
SDCCH—UL:ASSIGNMENT_COMPLETE分配確認(rèn)
SDCCH—DL:CONNECT 用戶摘機或連接消息
SDCCH—UL:CONNECT_ACKNOWLEDGE連接確認(rèn),表示MS接受連接
在紅顏色信令之后,未出現(xiàn)
SDCCH—DL:CONNECT
而出現(xiàn)blocked call 未接通
主叫手機在channal request (試呼)之后,如果缺少connect或者connect acknowledge,我們都視為block call,如果某小區(qū)SDCCH擁塞,那么我們從測試現(xiàn)象上應(yīng)該看到一次channal request之后直接轉(zhuǎn)為空閑模式;如果某小區(qū)TCH擁塞,那么在Call proceeding之后手機將轉(zhuǎn)為空閑模式。當(dāng)disconnect和channal release這兩條信令都未出現(xiàn),手機從專用模式轉(zhuǎn)為空閑模式則視為一次掉話。如何區(qū)分專用模式和空閑模式呢?比較直接的方法是觀察系統(tǒng)消息,系統(tǒng)消息1、2、3、4都是空閑模式特有的系統(tǒng)消息,而系統(tǒng)消息5和系統(tǒng)消息6則是專用模式下由SACCH下發(fā)的系統(tǒng)消息。
1、干擾導(dǎo)致的BLOCK CALL,上行干擾導(dǎo)致網(wǎng)絡(luò)沒有收到CHANNAL REQUEST。
2、手機故障導(dǎo)致BLOCK CALL,可能情況:手機向網(wǎng)絡(luò)發(fā)出了CM SERVICE REQUEST之后,沒有任何其他信令,網(wǎng)絡(luò)直接下發(fā)了CHANNAL RELEASE。此時手機已經(jīng)成功占用了SDCCH,正常來講,接著網(wǎng)絡(luò)應(yīng)下發(fā)鑒權(quán)、加密等信令,手機再上發(fā)SETUP。從缺失的信令判斷,這應(yīng)該是由于網(wǎng)絡(luò)不能正確解碼手機上發(fā)的CLASSMARK CHANGE信令導(dǎo)致下發(fā)CM SERVICE REJECT.
3、由于通話質(zhì)量差或信號差導(dǎo)致的BLOCK CALL
4、被叫手機未接聽導(dǎo)致的BLOCK CALL:由于被叫未接聽,缺少COONECT信令,被判決為一次BLOCK CALL
5、被叫手機位置區(qū)更新導(dǎo)致BLOCK CALL.