RRC Access Failure Troubleshooting PDF

RRC Access Failure Troubleshooting (IV) FROM PREVIO PREVIOUS US SLID SLIDE E

Identify if more than 10% of failures f or a cell are due to TNL (Transport Network Network Layer) :

 YES

VS.RRC.Rej.TNL.Cong

NO Identify if more than 10% of failures fo r a cell are due to FACH conges congestion tion :

 YES

VS.RRC.AttConnEstab.Msg >> VS.RRC.AttConnEstab.Sum

Solution 1: Recheck configuration( IPPATHs of Nodeb has same capacity of transmission one;same one;same for pair one) Solution 2: 2: Run the PING IP command on the IP IP of the NodeB to detect congestion on the IuB.

Solution 1: (After SPH226) MOD UCELLALGOSWITCH: CellId=xxxxx, RsvdPara1=RSVDBIT5-1; (will improve CS success rate, will degrade PS success rate) Solution 2: Offload traffic

VS.CellFACHUEs>25

Solution:: Offload traffic Solution

VS.CRNCIubBytesFACH.Tx VS.CRNCIubBytesFA CH.Tx or  VS.CRNCIubBytesPSR99.CCH.Tx are flat in time( limited)

Solution1: Offload traffic

FACH Channel utilisation>80%

Solution1: Offload traffic

NO

Identify if more than 10% of failures for a cell are due to VS.RRC.FailConnEstab.NoReply VS.RRC.FailCon nEstab.NoReply :

 YES VS.MaxR VS. MaxRTWPTWP- VS. VS.Mean MeanRTW RTWP P> 10 dB

Check missing neighbours

NO If RRC Estab Estab SR for whole RNC