【正文】 UE RRC connection RBS Reconfiguration plete Yes DL/UL GBR resource overload?UE Linitial context RBS Setup failure YespmErabEstabFailGbrDIEnb+or pmErabEstabGbrUlENB+RBS sends initial context setup response to MME No RBS Initial context MME Setup responseUE Initial context RBS Note:Corresponding counter per QCI pmErabEstabSucclnitQcipmUeCtxtEstabSucc + pmErabEstabSuccInit + Setup failurepmErabEstabSuccInitArp + Stepped for each successfully setup ERAB that has the given ARP Prionity LevepmErabEstabSuccInitPa + Stepped for successfully setup of bearer with privileged accessEnd signaling connection setup ERAB建立成功率處理經(jīng)驗(yàn)及流程失敗階段原因查找失敗原因優(yōu)化建議ERAB失敗通過UETR信令消息查看原因值Security update failures問題解決SIM，UE，ENB或MME安全性參數(shù)問題ERAB失敗通過UETR信令消息查看原因值vendor/UE specific issues問題解決SIM，UE，ENB或MME參數(shù)配置問題ERAB失敗檢查MME容量licens容量問題增加MME容量ERAB失敗通過地圖信息檢查周邊環(huán)境及站點(diǎn)分布弱覆蓋問題調(diào)整工參或者增加新站增強(qiáng)周邊覆蓋ERAB失敗檢查小區(qū)可用性、告警等，可能多個(gè)站點(diǎn)出現(xiàn)類似問題傳輸問題解決傳輸問題6 相關(guān)案例 PRB資源受限一、問題描述%，%，%，RRC建立失敗了4263次。S1建立成功率=S1建立成功率次數(shù)/S1建立請求次數(shù)*100%=pmS1SigConnEstabSucc/pmS1SigConnEstabAtt*100% 詳細(xì)counter統(tǒng)計(jì)節(jié)點(diǎn)Signalling connection setup triggered by initial UE message UE Initial UE RBSmessageppmS1SigConnEstabAttEm +pmS1SigConnEstabAtt +step for cause ”Emergency”pmS1SigConnEstabAttHpa +pmS1SigConnEstabAttEm +pmS1SigConnEstabAttHpa +pmS1SigConnEstabAttMod +pmS1SigConnEstabAttMta +pmS1SigConnEstabAttMos +pmS1SigConnEstabAttDta +step for cause ”High Prio Access”pmS1SigConnEstabAttMod +step for cause ”Mobile Originating Data”pmS1SigConnEstabAttMta +step for cause ”Mobile Terminating Access”pmS1SigConnEstabAttMos +step for cause ”Mobile Originating Signalling”pmS1SigConnEstabAttDta +RBS timeout on initial context setup request from MME?step for cause ”Delay Tolerant Access” yesEnd signallingconnection setup NoMME sends initial context setup request to RBSRBS Initial context MMESetup request(ERABs, Sec keys)Any message received on the S1 logical connection? NO Stepped for any of the following pmS1SigConnEstabSucc +messages: Yes pmS1SigConnEstabSuccEm +S1 downlink NAS transport step for cause ”Emergency” S1 UE context release mand