TCH分配失敗處理流程定義-TCH分配失敗（含切換）指占用SDCCH后對TCH的呼叫中所有分配TCH信道失敗的總次數(shù)。統(tǒng)計的為“切入的HandoverFailure+AssignmentFailure”消息。（溢出包括主叫和被叫占用SDCCH后試圖建立TCH失敗的情況，不包括非常早分配時指派TCH信道用做SDCCH的情況，包括各種切換和直接重試情況。）定義-TCH分配失敗(含切換）(TCH_CALL_REQ-MS_TCH_SUCC_SEIZ_ASSIGN_CMPLT)fromP_NBSC_TRAFFIC+(-MSC_O_SDCCH_TCH-BSC_O_SDCCH_TCH-CELL_SDCCH_TCH+MSC_I_TCH_TCH_AT+MSC_I_SDCCH_TCH_AT-MSC_I_TCH_TCH-MSC_I_SDCCH_TCH+BSC_I_TCH_TCH_AT+BSC_I_SDCCH_TCH_AT-BSC_I_TCH_TCH-BSC_I_SDCCH_TCH+CELL_TCH_TCH_AT+CELL_SDCCH_TCH_AT-CELL_TCH_TCH-CELL_SDCCH_TCH)FromP_NBSC_HO定義-詳細(xì)說明TCH_CALL_REQNumberofTCHrequestsfornormalassignment(successful+unccessful)WhentheRadioResourceManagerreceivesaTCHrequestinacallattempt.MSSUCCTCHSEIZUREFORASSIGNMENTCOMPLETENumberoftimeswhenaMSissuccessfullyontheTCHafteranASSIGNMENT_COMPLETEmessage.WhenanASSIGNMENT_COMPLETEmessageisreceivedfromtheMSviaBTStoTCH.TheTCHisreservedandtheMSismovedfromtheSDCCHtotheTCH.Thiscounterisupdatedonlywhenacallisestablishedforthefirsttime,notduringhandovers.ThiscounterisnotupdatedwithsoftwaresFACCHcallsetupbecauseofSDCCHcongestion,directedretryprocedureinBSC,TCHassignmenttosuperreuseTRXinIUOanddirectaccesstosuperre-useTRXinIUO.TCH分配失敗形成的主要原因TCH信道擁塞基站硬件故障（含天饋質(zhì)量）或硬件故障導(dǎo)致的無線資源有效性下降基站傳輸故障或閃斷內(nèi)外部干擾致信號質(zhì)量低弱覆蓋致信號質(zhì)量低與話務(wù)負(fù)荷和功率控制等相關(guān)參數(shù)設(shè)置不合理TCH分配失敗處理流程TCH分配失敗主要處理方案覆蓋合理性調(diào)整

天線調(diào)整或改造TCH容量的增加擁塞嚴(yán)重，應(yīng)擴容或建新站，DCS1800系統(tǒng)使用網(wǎng)絡(luò)頻率質(zhì)量的提升頻率修改或整網(wǎng)頻率規(guī)劃，ZERM;弱覆蓋增加新站或天線調(diào)整基站硬