TM TT CNG VICI. Cc yu cu cng vic Tim hiu nguyn nhn nhay tram BTS Nokia sau khi thit bi truyn dn switch over. Khai thac va x l cc li pht sinh trn thit bi mcRNC: Chuyn RNC khac MSC, chuyn RNC khac SGSN, chuyn tram. Tham gia phn tch, a ra nguyn nhn, gii php khc phc cac li lin quan n thit bi.II. Hin trng1. S lngKV3 trin khai 5 mcRNC : RCHT49, RCHT50, RCHT51, RCHT52, RCHT53 v thc hin ti c 5 RNC, c th

mcRNCTnh

RCHT49Bn Tre

RCHT50Bc Liu

RCHT51C Mau

RCHT52ng Thp

RCHT53An Giang

2. Khai thc n thi im hin ti cha trin khai chuyn mcRNC sang MSC khc, cha thc hin chuyn mcRNC sang SGSN khc thc hin chuyn NodeB t cRNC sang mcRNC theo nhiu t ti khc nhau.III. Tm hiu cc li pht sinh trong qu trnh khai thc1. Chuyn trm :Nguy c: Khng khai c CDD ca trm do trng d liuThc hin kim tra xng c trn Netact, c th c cc NodeB chuyn t RNC i RNC khc nhng khng thc hin xa xng c, khi cc trm ny chuyn v li RNC ban u s b trng tn trm nn khng khai c CDD. Xa cc xng c ny v thc hin khai li CDD (cRNC c trng hp ny, mcRNC cha c)Sau chuyn trm bo hiu khng ln, cht trmNguy c: Sau khi chuyn trm active li cell khng lnTrong qu trnh khai CDD, khai trn OMU sau c th dn n bo hiu khng ln,phi khai trn OMU trc khi thc hin cc khai bo CDD, neighbor khcNguy c: Trong qu trnh thc hin chuyn trm cell vn pht sng bnh thng nhng mt dch v khch hngKhi chuyn trm khc RNC nhng cng MSC v dng li NO c phi thc hin xa NO trn MSC v khai li, trong thi gian thc hin s b mt dch v (c sng nhng khng gi c) nn phi lock cell trc.Thc hin lock ton b cell thuc cc trm cn chuyn trc khi khai trn MSCBackup li trng thi cell trc khi thc hin, trnh sau khi chuyn trm unlock nhm cc cell cha pht sng hoc unlock thiu cell pht sng.2. Chuyn RNC khc MSC3. Chuyn RNC khc SGSN