How to Improve Swap DCR 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. 2014-6-18 华为机密， 未经许可不得扩散 第 1 页, 共 6 页 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 Static TOC GRFU 1TRX 80w/49dBm GRFU 2TRX 40w/46dBm GRFU 3TRX 27w/44.3dBm GRFU 4TRX 20w/43dBm GRFU 5TRX 12w/40.8dBm GRFU 6TRX 10w/40dBm DRFU 900 45W/46.5dBm DRFU(PBT) 1800 63w/48dBm 2014-6-18 华为机密，未经许可不得扩散 第 2 页, 共 6 页 3. DRFU 1800 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 Send Receive Mode 1 GRFU Double Feeder(1TX+2RX) 2 GRFU Single Feeder(1TX+2RX) 1 DRFU Double Feeder(2TX+2RX) 2 DRFU (PBT) Single Feeder(1TX+2RX) 2.3 Neighbors Relationship,we can use Nastar to check the neighbors,especially missing neighbors. 2014-6-18 华为机密，未经许可不得扩散 第 3 页, 共 6 页 4. 2.4 Frequency HSN MAIO and so on. 5. 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 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 2014-6-18 华为机密，未经许可不得扩散 第 5 页, 共 6页 6. 文档名称 文档密级： 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 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, 2014-6-18 华为机密，未经许可不得扩散 第 6 页, 共 6 页
7. 文档名称 文档密级： 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 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, 2014-6-18 华为机密，未经许可不得扩散 第 6 页, 共 6 页
Brief for CV: Issue Hardware
Cell Configuration
Handover Parameters:
Solution Check Alarms if Call Drops due to equipment failure then, reset the site. If no alarm on site, there are still call drops, then reset the site with Level 4, might be something wrong with BTS software. Check for VSWR if value is greater than 1.5,there might be something wrong with feeder,TMA,or antenna and so on, BSS team with site master will check the site. Power Configuration: Huawei Default Configuration is as: GRFU 1TRX 80w/49dBm,GRFU 2TRX 40w/46dBm,GRFU 3TRX 27w/44.3dBm,GRFU 4TRX 20w/43dBm,GRFU 5TRX 12w/40.8dBm,GRFU 6TRX 10w/40dBm,DRFU 900 45W/46.5dBm DRFU(PBT) 1800 63w/48dBm. DRFU 1800 40W/46dBm. Send Receive Mode checking, for different TRX configuration, there are different values of send receive mode. According to the configuration as below, please correct it. TRX CONFIGURATION Send Receive Mode: 1 GRFU Double Feeder(1TX+2RX) 2 GRFU Single Feeder(1TX+2RX) 1 DRFU Double Feeder(2TX+2RX) 2 DRFU (PBT) Single Feeder(1TX+2RX) NBR Relations: We can use Nastar to check the Neighbors, especially missing neighbors. 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 analysis, if there is LOW HSR between 2 neighbors, and also Cell Outgoing Handover Fail Reconn Fail happens, we
need adjust some handover parameters as below: Edge HO UL RX_LEV Threshold, default value is 10, recommended value 15. Edge HO DL RX_LEV Threshold, default value is 19, recommended value 25. Min DL Power on HO Candidate Cell, default value is 10, recommended value 0. Min UP Power on HO Candidate Cell, default value is 10, recommended value 0. Min Interval for Consecutive HOs, default value is 4, recommended value 2. Min Interval for Emerg.HOs, default value is 4, recommended value 2. Filter Length for TCH Level, default value is 6 , recommended value 3. Filter Length for TCH Qual, default value is 6, recommended value 3. DL Qual. Threshold, default value is 55, recommended value 40. UL Qual. Threshold, default value is 55, recommended value 40. 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. Frequency HSN AND MAIO: Remove any Frequency, HSN, and MAIO clashes. Data Configuration:
Coverage Parameters: First Analyze Receive Quality, Level, TA and so on by: 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, Cells with larger TA samples: Control Coverage parameters for example: RACH Min.Access Level (dbm), default value is -115, recommended value -109. Random Access Error Threshold, default value is 180, recommended value 220. RXLEV_ACCESS_MIN, default value is 8, recommended value 10. Otherwise, we can adjust down tilt and power to control the coverage. Interference Parameters: First analyze High receive level with bad quality A lot of quality handovers interference band are bigger than 3,there may be interference by following : 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. We can adjust the parameters as below: Radio Link Timeout (SACCH period (480ms)) this parameter is about downlink, default value is 16, recommended value 52. SACCH Multi-Frames (SACCH period (480ms)) this parameter is about uplink, default value is 18, recommended value 36. T200 FACCH/F(5ms) default value is 50,recommended value 80. T200 FACCH/H(5ms) default value is 50,recommended value 80. N200 of FACCH/Half rate, default value is 29, recommended value 50. N200 of FACCH/Full rate, default value is 34, recommended value 50.if there is strong interference through monitoring channel interference band, we need eliminate it.
