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Overview
Used Tools
Technical Procedure
                           SDCCH Drop Rate
Flow Chart
Exemples




                                              BENAIAD Abdellah
Overview           Used Tool      Technical procedure         Flow Chart     Examples




Overview
 Introduction
SDCCH
Assignment on SDCCH
SDCCH Drop Rate


                           This chapter is designed to provide an overview of
                           root cause analysis for SDCCH drop rate KPI. It
                           addresses the SDCCH drop rate analysis, investigation
                           procedures and troubleshooting techniques to degrade
                           the effect of this issue.




                                                 28/12/2010   SDCCH Drop Rate
Overview           Used Tool      Technical procedure         Flow Chart             Examples




Overview
Introduction
 SDCCH
Assignment on SDCCH
SDCCH Drop Rate
                           SDCCH is a bidirectional logical channel used in
                           different ways:

                           -Registration:   periodic   location               update,    IMSI
                           attach/detach.
                           -Call setup: immediate assignment.
                           -SMS to/from MS in dedicated mode.




                                                 28/12/2010   SDCCH Drop Rate
Overview            Used Tool     Technical procedure         Flow Chart     Examples




Overview                    Request and allocation of SDCCH:
Introduction
SDCCH
 Assignment on SDCCH
SDCCH Drop Rate




                                                 28/12/2010   SDCCH Drop Rate
Overview        Used Tool         Technical procedure            Flow Chart               Examples




           MS
                            BSC       Paging            BTS        Paging         MS
           C    Paging
                                     command                       request
                                                                                   PCH

                                  Channel required              Channel request
                                                                                   RACH
                                  Channel Activation

                                    Ch Activation
                                    Acknowledge
                                      Immediate
                                     assignment
                                       command                   Immediate
                                                                 assignment




                                              28/12/2010      SDCCH Drop Rate
Overview           Used Tool        Technical procedure         Flow Chart        Examples




Overview
Introduction
SDCCH
Assignment on SDCCH
 SDCCH Drop Rate

                           SDCCH Drop Rate is a KPI which largely decides the
                           subscriber service quality , the existing KPI formula is
                           listed below:
                             (C10602+C10604+C10605+C10646+C10653+C10601+C10603+C10606)*100

                                                      (C11644+C11646)




                                                   28/12/2010   SDCCH Drop Rate

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Sdcch drop rate

  • 1. Knowledge sharing sessions Overview Used Tools Technical Procedure SDCCH Drop Rate Flow Chart Exemples BENAIAD Abdellah
  • 2. Overview Used Tool Technical procedure Flow Chart Examples Overview Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate This chapter is designed to provide an overview of root cause analysis for SDCCH drop rate KPI. It addresses the SDCCH drop rate analysis, investigation procedures and troubleshooting techniques to degrade the effect of this issue. 28/12/2010 SDCCH Drop Rate
  • 3. Overview Used Tool Technical procedure Flow Chart Examples Overview Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate SDCCH is a bidirectional logical channel used in different ways: -Registration: periodic location update, IMSI attach/detach. -Call setup: immediate assignment. -SMS to/from MS in dedicated mode. 28/12/2010 SDCCH Drop Rate
  • 4. Overview Used Tool Technical procedure Flow Chart Examples Overview Request and allocation of SDCCH: Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate 28/12/2010 SDCCH Drop Rate
  • 5. Overview Used Tool Technical procedure Flow Chart Examples MS BSC Paging BTS Paging MS C Paging command request PCH Channel required Channel request RACH Channel Activation Ch Activation Acknowledge Immediate assignment command Immediate assignment 28/12/2010 SDCCH Drop Rate
  • 6. Overview Used Tool Technical procedure Flow Chart Examples Overview Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate SDCCH Drop Rate is a KPI which largely decides the subscriber service quality , the existing KPI formula is listed below: (C10602+C10604+C10605+C10646+C10653+C10601+C10603+C10606)*100 (C11644+C11646) 28/12/2010 SDCCH Drop Rate
  • 7. Overview Used Tool Technical procedure Flow Chart Examples Overview Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate C10601 C10602 C10603 C10603 It represents the number of call drops due to contact C10604 C10604 loss between RMM and Service Management Module C10605 C10605 (SMM) on SDCCH. C10606 C10646 C10653 C11644 C11646 28/12/2010 SDCCH Drop Rate
  • 8. Overview Used Tool Technical procedure Flow Chart Examples Overview Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate C10601 C10602 C10603 C10603 C10604 C10604 It represents the number of call drops due to radio link C10605 C10605 failure on SDCCH. C10606 C10646 C10653 C11644 C11646 28/12/2010 SDCCH Drop Rate
  • 9. Overview Used Tool Technical procedure Flow Chart Examples Overview Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate C10601 C10602 C10603 C10604 It represents the number of call drops due to LAPD link C10605 failure on SDCCH. C10606 C10646 C10653 C11644 C11646 28/12/2010 SDCCH Drop Rate
  • 10. Overview Used Tool Technical procedure Flow Chart Examples Overview Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate C10601 C10602 C10603 C10604 It represents the number of call drops due to SDCCH C10605 forced C10606 release. C10646 C10653 C11644 C11646 28/12/2010 SDCCH Drop Rate
  • 11. Overview Used Tool Technical procedure Flow Chart Examples Overview Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate C10601 C10602 C10603 It represents the number of call drops due to force C10604 C10605 release from high priority calls on SDCCH. BSC C10606 receives force release message from BTS for high C10646 priority calls and counter increments. C10653 C11644 C11646 28/12/2010 SDCCH Drop Rate
  • 12. Overview Used Tool Technical procedure Flow Chart Examples Overview Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate C10601 C10602 C10603 C10604 C10605 It represents the number of call drops on SDCCH due C10606 to other causes. C10646 C10653 C11644 C11646 28/12/2010 SDCCH Drop Rate
  • 13. Overview Used Tool Technical procedure Flow Chart Examples Overview Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate C10601 C10602 C10603 C10604 It represents the total number of call drops due to C10605 handover C10606 failure on SDCCH, this counter is not allowed. C10646 C10653 C11644 C11646 28/12/2010 SDCCH Drop Rate
  • 14. Overview Used Tool Technical procedure Flow Chart Examples Overview Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate C10601 C10602 C10603 C10604 It represents the total number of SDCCH call drops C10605 (short C10606 message). C10646 C10653 C11644 C11646 28/12/2010 SDCCH Drop Rate
  • 15. Overview Used Tool Technical procedure Flow Chart Examples Overview Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate C10601 C10602 C10603 C10604 C10605 Number of successful SDCCH assignments. C10606 C10646 C10653 C11644 C11646 28/12/2010 SDCCH Drop Rate
  • 16. Overview Used Tool Technical procedure Flow Chart Examples Overview Introduction SDCCH Assignment on SDCCH SDCCH Drop Rate C10601 C10602 C10603 C10604 C10605 Number of successful SDCCH handovers. C10606 C10646 C10653 C11644 C11646 28/12/2010 SDCCH Drop Rate
  • 17. Overview Used Tool Technical procedure Flow Chart Examples 28/12/2010 SDCCH Drop Rate
  • 18. Overview Used Tool Technical procedure Flow Chart Examples Used Tools Business Objects 6.5 MCOM 4.2 ZXG10 OMCR TEMS Investigation which can be used for accessing different performance statistics, creating queries, setting up reports, creating variables and using the Business Objects functions to analyze the data in the reports. 28/12/2010 SDCCH Drop Rate
  • 19. Overview Used Tool Technical procedure Flow Chart Examples Used Tools Business Objects 6.5 MCOM 4.2 ZXG10 OMCR TEMS Investigation This tool is used to know the type of interference (Co- channel interference or adjacent interference) between cells; and the value of tilt, azimuth and height of the cell. 28/12/2010 SDCCH Drop Rate
  • 20. Overview Used Tool Technical procedure Flow Chart Examples Used Tools Business Objects 6.5 MCOM 4.2 ZXG10 OMCR TEMS Investigation which can be used to provide access to all the available support activities for Operations and Maintenance in the radio and core networks, besides, the accessibility to Configuration Management, Fault management and Performance management 28/12/2010 SDCCH Drop Rate
  • 21. Overview Used Tool Technical procedure Flow Chart Examples Used Tools Business Objects 6.5 MCOM 4.2 ZXG10 OMCR TEMS Investigation Ericsson’s tool which is used to analyze drive tests on the downlink level. 28/12/2010 SDCCH Drop Rate
  • 22. Overview Used Tool Technical Procedure Flow Chart Examples Technical Procedure SDCCH Drop causes SDCCH Drop Reasons troubleshooting The following are main causes for SDCCH drop rate: SDCCH Drops Due connection loss RMM SMM. SDCCH Drops Due Radio Failure. SDCCH Drops Due LAPD Failure. SDCCH Drops Due OMC Forced release SDCCH Drops Due Preemption. SDCCH Drops Due Others . SDCCH Drops Due Handover Failure. SDCCH Drops SMS (according to the formula of SDCCH Drop Rate). 28/12/2010 SDCCH Drop Rate
  • 23. Overview Used Tool Technical Procedure Flow Chart Examples Technical Procedure SDCCH Drop causes SDCCH Drop Reasons troubleshooting The following are main causes for SDCCH drop rate: SDCCH Drops Due connection loss RMM SMM. SDCCH Drops Due Radio Failure. SDCCH Drops Due LAPD Failure. SDCCH Drops Due OMC Forced release . SDCCH Drops Due Preemption . SDCCH Drops Due Others . SDCCH Drops Due Handover Failure. SDCCH Drops SMS. 28/12/2010 SDCCH Drop Rate
  • 24. Overview Used Tool Technical Procedure Flow Chart Examples Technical Procedure SDCCH Drop types SDCCH Drop Reasons The following are reasons of Radio SDCCH drop: RADIO link loss 1. There exists weak coverage area, and radio signal LAPD SDDCH Drop is weak too. troubleshooting 2.There exists interference, such as intra-network interference due to unreasonable frequency planning, and other external interference, etc. 3.Unreasonable radio parameter setting 4.Equipment hardware fault, such as low output power of the power amplifier, large difference among different carrier transmission power, carrier transmitter fault, combiner fault, etc. 28/12/2010 SDCCH Drop Rate
  • 25. Overview Used Tool Technical Procedure Flow Chart Examples Technical Procedure SDCCH Drop types SDCCH Drop Reasons RADIO link loss LAPD SDDCH Drop troubleshooting 5.Antenna feeder system fault. For example, VSWR of antenna feeder is big; antenna is too high or lower inclination is unreasonable, which causes too big the coverage range or cross-cell coverage, and forms the remote isolated island effect; etc. 28/12/2010 SDCCH Drop Rate
  • 26. Overview Used Tool Technical Procedure Flow Chart Examples Technical Procedure SDCCH Drop types SDCCH Drop Reasons RADIO link loss LAPD SDDCH Drop troubleshooting The following are reasons of LAPD SDCCH drop: 1.Site transmission problems, such as transmission interruption or unstable transmission . 2.Site hardware fault, such as unreliable E1 cable, CMM fault, etc. 3.BSC hardware fault. 28/12/2010 SDCCH Drop Rate
  • 27. Overview Used Tool Technical Procedure Flow Chart Examples Technical Procedure SDCCH Drop types SDCCH Drop Reasons troubleshooting SDCCH Drop rate analysis troubleshooting procedure: 1. SDCCH availability. 2. SDCCH Drop causes. 3. Basic NMS to know which TRX might be faulty. 4. Alarms. 5. BTS measurement and cell measurement. 6. Data base parameter. 7. Drive testing and site audit. 28/12/2010 SDCCH Drop Rate
  • 28. Overview Used Tool Technical procedure Flow Chart Examples Flow Chart It is advised to locate the problem by checking radio parameters together with hardware troubleshooting. The flow of handling SDCCH drop is shown below: 28/12/2010 SDCCH Drop Rate
  • 29. Start SDCCH Drop Rate high certain cell yes No Check yes SDCCH availability yes Is there Open TT to BSS team LAPD problem? No Is there HW Open TT to yes problem BSS team (cell/TRX/TS )? No * Reset cell
  • 30. * ** Is there yes Open TT to BSS LAPD problem? team No RF problems Whether radio yes Modify parameter unreasonable are set parameters reasonably No Whether yes Trouble interference shoot exist interference No
  • 31. *** Whether yes fault exist in Trouble coverage shoot coverage No Whether yes fault exist in Troubleshoot equipment equipment fault HW No Whether fault exist in yes Trouble antenna shoot antenna feeder feeder fault system No Whether the No yes SDCCH Drop Rate persist restart the investigation END
  • 32. Overview Used Tool Technical procedure Flow Chart Examples Exemples 22685A: Hardwar Problem by checking data base stat, we notice a high SDCCH Radio Problem LAPD Problem Drop Rate on the site. Problem Description: using ZXG10 OMCR tool, the problem is a PA power alarm (hardware problem). Action Taken: open TT to BSS team to solve the PA power alarm. 28/12/2010 SDCCH Drop Rate
  • 33. Overview Used Tool Technical procedure Flow Chart Examples Exemples 03102A: Hardwar Problem Problem Description: Co-channel interference on the Radio Problem LAPD Problem BCCH of 03102A Action Taken: Changing the BCCH frequency from:108-->89 22685A: Problem Description: 22685A of BSCSBA2 (BSC04) is having PA Output Power alarm on TRX1 Action Taken: Replacing the faulty TRX 28/12/2010 SDCCH Drop Rate
  • 34. Overview Used Tool Technical procedure Flow Chart Examples Exemples 03663A: Hardwar Problem Problem Description: Transmission disconnection Radio Problem LAPD Problem problem on the A-bis interface Action Taken: Fixing the TXM problem 28/12/2010 SDCCH Drop Rate
  • 35. References list Reference [10] sjzl20062303-ZXG10-BSS (V2.97) Operation Manual (Radio Parameters) GBO_014_E1_0 Special Topic of Radio Network Optimization-82 GBC_004_E1_0 Radio parameters -50 ZTE Statistics 28/12/2010 SDCCH Drop Rate
  • 36. 28/12/2010 SDCCH Drop Rate
  • 37. Appendix DRT/EDRT The DRT/EDRT fulfills conversion between voice codes at the GSM radio interface and the PSTN A-law PCM voice codes in the BSC, and implements rate adaptation (including data services rate adaptation) between them. DRT: Dual-rate transcoder, realizing the transcoding service processing. It can process 126 FRs or 32 EFRs at most. EDRT (C62): Enhanced dual-rate transcoder, an enhanced version of the DRT board. It can process 126 FRs or 126 EFRs at most. EDRT (C64): Enhanced dual-rate transcoder, an enhanced version of the DRT board. It can process 126 FRs, 126 EFRs or 126 HRs at most. Functions and Principles The board has the following functions.  Performs the transcoding and rate adaptation function: It converts the 260-bit vocoder block into one hundred and sixty 8-bit A-law PCM sample signals, and vice versa. Performs framing and vocoder block synchronization, detect voice activation, regulate the block phase in the downlink direction to minimize delay, send alarms to BSC by passing through BTS through in-band signaling, processes data blocks in compliance with the protocol standard rate adaptation and re-assorting them following the A interface requirements.  Provide physical-layer functions of the digital trunk interface.  Separates signals, SS7 links pass transparently, and the service channels pass through the DSP for processing.  Has the HDLC channels communicating directly with the, facilitating O & M Center. Fig 3.18-1 shows the DRT/EDRT board organizational diagram. DRT uses eight DSPs, EDRT (C62) uses six, and EDRT (C64) uses two. In the given figure, n = 8, 6, 2 respectively. The DRT/EDRT comprises the DSP, CPU, and switching circuits. The DSP is responsible for mass calculations, implementing the conversion between radio service channels and ground service channels. It is the core of the DRT/EDRT board. Fig 3.18-1 DRT/EDRT Board Organizational Diagram HDLC i t c u i r c n g h i t c i w S DSPn . . A .. .. CPU DSP4 DSP3 Abis HPI DSP 2 DSP 1 DRT/EDRT Board Fault Fault Symptom DSP is faulty or communication with the corresponding TCPP is disconnected. Fault Cause Analysis Communication between TCPP and DRT/EDRT is faulty. Hardware of the TCPP board is faulty. DSP on the DRT/EDRT board is faulty. Troubleshooting Perform the following steps to troubleshoot the fault: 1. Check whether the corresponding TCPP board is faulty. If it is faulty, troubleshoot the TCPP board fault first. 2. If the DSP is faulty, then go to step 6. 3. Check whether there is any clock loss alarm from this board. If there is, then reset and unplug/plug the relevant board. 4. Check whether the backplane connection cable is loose or modified. 5. Check whether the foreground and background data are consistent and whether relevant data are configured. 6. Download the DRT and EDRT versions again and reset the board. 7. Replace the DRT/EDRT board. If the fault still remains, plug the board to another slot. Precautions Be sure to wear an antistatic wrist strap when touching a board or component. 28/12/2010 SDCCH Drop Rate
  • 38. Radio parameters Radio parameters setting Cell’s minimum access level: which causes SDCCH drop in weak coverage area. Unreasonable BSIC setting Unreasonable power control setting, such as unreasonable level, quality power control threshold, which will cause MS to reduce power even in the case of weak signal and poor call quality. () Unreasonable FH parameter setting: parameter setting Unreasonable MAIO configuration will cause co-channel interference and adjacent-channel interference within one site. Incomplete adjacent-cell data definition or configuration error Congestion exists in adjacent cell 28/12/2010 SDCCH Drop Rate