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How to Improve Call drop rate Background:in
swap project,after swap there were some cells with
worse dcr,in order to improve this kpi,We summarized these aspects and gave some suggestions:
1 Hardware problem 1.1 check the alarm and history alarm,normally it can lead to call drops due to Equipment Failure. 1.2 reset the site,If there are some call drops due to Equipment Failure without alarm,maybe there are something wrong with our BTS software.reset the site with level 4 during night.if also not ok,get the help from BSC guy.
1.3 check the WSWR of the site through MML,if the value of VSWR is bigger than 1.5,maybe there are something wrong with feeder,TMA,or antenna and so on.let site enginner go to this site with site master for testing the VSWR.
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2 CELL CONFIGURATION 2.1 Power configuration,For our swap project,we should keep the same power with before.Our trx default power as below,we can adjust the power type,power level and power finetune of trx to keep the same with alcatel’s TOC.
TRX TYPE GRFU 1TRX GRFU 2TRX GRFU 3TRX GRFU 4TRX GRFU 5TRX GRFU 6TRX DRFU 900 DRFU(PBT) 1800 DRFU 1800
Static TOC 80w/49dBm 40w/46dBm 27w/44.3dBm 20w/43dBm 12w/40.8dBm 10w/40dBm 45W/46.5dBm 63w/48dBm 40W/46dBm
2.2 Send Receive Mode checking,for different trx configuration,there are different values of send receive mode.according to the configuration as below,pls correct it.
TRX CONFIGURATION 1 GRFU 2 GRFU 1 DRFU 2013-8-14
Send Receive Mode Double Feeder(1TX+2RX) Single Feeder(1TX+2RX) Double Feeder(2TX+2RX) 文文文文文文文文文文文文文
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2 DRFU (PBT)
Single Feeder(1TX+2RX)
2.3 Neighbors Relationship,we can neighbors,especially missing neighbors.
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use
Nastar
to
check
the
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2.4 Frequency HSN MAIO and so on.
3 DATA CONFIGURATION 3.1 Coverage Parameters About this kind problem,firstly we can collect the Measurement from M2000: Number of MRs based on TA per TRX Radio Link Failure Measurement per TRX Radio Link Failure Measurement based on TA per TRX Receive Quality Measurement per TRX TCHF Receive Level Measurement per TRX TCHH Receive Level Measurement per TRX Uplink-and-Downlink Balance Measurement per TRX After we anlyzed the report,we can know about the Receive Quality,Level,TA and so on.if the TA is big for coverage plan,we should control the coverage.parameters we can adjust as below: a. RACH Min.Access Level(dbm),default value is -115,recommended value -109. b. Random Access Error Threshold, default value is 180, recommended value 220 2013-8-14
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c. RXLEV_ACCESS_MIN, default value is 8, recommended value 10. d. otherwise,we can adjust downtilt and power to control the coverage. 3.2 Interference Parameters About this kind of problem,we can collect the Measurement from M2000: Radio Link Failure Measurement per TRX Receive Quality Measurement per TRX TCHF Receive Level Measurement per TRX TCHH Receive Level Measurement per TRX GSM Cell to GSM Cell Outgoing Handover Measurement Interference Band Measurement per TRX After anlysis,if there are high receive level with bad quality,a lot of quality handovers and interference band are bigger than 3,there maybe interference,we can adjusted the parameters as below: a. Radio Link Timeout(SACCH period (480ms)) this parameter is about downlink, default value is 16, recommended value 52 b. SACCH Multi-Frames(SACCH period (480ms)) this parameter is about uplink, default value is 18, recommended value 36. c. T200 FACCH/F(5ms) default value is 50,recommended value 80. d. T200 FACCH/H(5ms) default value is 50,recommended value 80. e. N200 of FACCH/Half rate, default value is 29,recommended value 50. f. N200 of FACCH/Full rate, default value is 34,recommended value 50. g. if there is strong interference through monitoring channel interference band,we need eliminate it. 3.3 Handover Parameters About this kind of problem,we can collect the Measurement from M2000: Incoming Internal Inter-Cell Handover Measurement per Cell Outgoing Internal Inter-Cell Handover Measurement per Cell Incoming External Inter-Cell Handover Measurement per Cell Outgoing External Inter-Cell Handover Measurement per Cell GSM Cell to GSM Cell Outgoing Handover Measurement After anlysis,if there is bad hsr between 2 neighbors,and also Cell Outgoing Handover Fail Reconn Fail happens,we need adjust some handover parameters as below: a. Edge HO UL RX_LEV Threshold,default value is 10,recommended value 15. b. Edge HO DL RX_LEV Threshold,default value is 19,recommended value 2013-8-14
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25. c. Min DL Power on HO Candidate Cell,default value is 10,recommended value 0. d. Min UP Power on HO Candidate Cell,default value is 10,recommended value 0. e. Min Interval for Consecutive HOs,default value is 4,recommended value 2. f. Min Interval for Emerg.HOs,default value is 4,recommended value 2. g. Filter Length for TCH Level,default value is 6,recommended value 3. h. Filter Length for TCH Qual,default value is 6,recommended value 3. i. DL Qual. Threshold,default value is 55,recommended value 40. j. UL Qual. Threshold,default value is 55,recommended value 40. k. MR.Preprocessing, default value is YES,recommended value NO. About the values of parameters,just recommended,you can decide to choose according to actual situation, detailed meaning of these parameters,you can get it from LMT help document,thanks,
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