主頁(http://www.130131.com):LTE基礎(chǔ):CSFB流程主要信令點(diǎn)說明
CSFB:從LTE網(wǎng)絡(luò)基于R8忙重定向至GSM網(wǎng)絡(luò)
2、LTE網(wǎng)絡(luò):RRCConnectionRelease,攜帶配置的GERAN相鄰頻點(diǎn)組起始頻點(diǎn)和GERAN BCCH相鄰頻點(diǎn)信息,對(duì)應(yīng)Event List中InterRATRedirectionReq;
3、GSM網(wǎng)絡(luò):CM Service Request,攜帶業(yè)務(wù)類別及TMSI信息,對(duì)應(yīng)Event List中InterRATRedirectionSuc;
4、GSM網(wǎng)絡(luò):Alerting,表示核心網(wǎng)給主叫回振鈴音,被叫已接通,對(duì)應(yīng)Event List中CSFBServiceSuc;(另通過Setup消息可以查看被叫號(hào)碼)
5、GSM網(wǎng)絡(luò):Channel Release,對(duì)應(yīng)Event List中目前版本顯示有誤(GSMCallDropped);(另用戶主動(dòng)掛機(jī)對(duì)應(yīng)Disconnect消息,方向?yàn)閁L,Channel Release消息為網(wǎng)絡(luò)側(cè)下發(fā),DL)
6、LTE網(wǎng)絡(luò):TrackingAreaUpdateAccept,攜帶TAU類別(combined-TA)、TAL對(duì)應(yīng)的GSM側(cè)LAC信息,對(duì)應(yīng)Event List中TAUpdateSuc。
被叫區(qū)別于主叫在于:
2、LTE網(wǎng)絡(luò):ExtendedServiceRequest,攜帶service-type:mobile-terminating-CS-fallback,對(duì)應(yīng)Event List中CSFBServiceRequest;
3、LTE網(wǎng)絡(luò):RRCConnectionRelease,對(duì)應(yīng)Event List中InterRATRedirectionReq;
4、GSM網(wǎng)絡(luò):Paging Response,對(duì)應(yīng)Event List中GSMCallAttempt(MTC);
5、GSM網(wǎng)絡(luò):Alerting,對(duì)應(yīng)Event List中CSFBServiceSuc;
6、GSM網(wǎng)絡(luò):Channel Release,無對(duì)應(yīng)Event;
7、LTE網(wǎng)絡(luò):TrackingAreaUpdateAccept,對(duì)應(yīng)Event List中TAUpdateSuc。
相關(guān)時(shí)延統(tǒng)計(jì)信令點(diǎn): 以上面一系列截圖為例統(tǒng)計(jì): 1、主叫回落時(shí)延:
2、主叫返回時(shí)延:
3、被叫回落時(shí)延:
4、被叫返回時(shí)延:
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