Agenda

1. Agenda • Introduction of NETWORK PERFORMANCE tools (AIS Access Database for Optimization) • Brief on main KPI formulas • Drop call analysis • SDCCH and TCH counters and meaning • Explanation of RNO process • BTC Power control and related parameters recommendation.

2. Main Objective • Tools for daily Network Performance monitoring • Iterative process to maintain and improve network performance • Discuss and understand the important BSC statistics in GSM network. • Identify the reason of the problem cells and rectify the faults.

3. Optimization Activities • Daily performance data monitoring and problems troubleshooting • Weekly/Monthly quality report • Neighbouring relationship and parameter setting review • Coverage optimisation • Frequency replan • Feature setting design • Drive test

4. Network Performance Measurement tools • A tailor made access database tools - 519, 153 and 232 reports generate by NMS • A tool that has been customized to few important levels - PLMN level - BSC Level - Cluster Level - Cell Level - Top 20 worse performance cells - Adjacencies handover statistics - Timing advance statistics • Macro to generate daily worse performance cells

5. Drop call analysis and its related Key Performance Indicators • TCH Drop Call Rate (DCR_4f) • TCH and SDCCH Availability ( 100%) • BCCH Missing Alarms ( should be 0, 1-3 is the acceptable value) • UL and DL quality (0 - 4)or 196 report, should be above 95% • Calls (To monitor daily call trends) • CSSR ( >95%) • UL interference band distribution (99.9% for Band 1) or 196 report • Handover Failure rate (< 5%) or 153 and 062 report • Average of call Distance (Base on Timing advance measurement) or 232 report • SDCCH/TCH Access and SDCCH/TCH success

6. Drop Call Analysis

7. Drop call analysis and its related counters • TCH/SDCCH Radio Fail • TCH/SDCCH_RF_Old_HO • TCH/SDCCH Abis_Fail_Call • TCH/SDCCH Abis_Fail_Old • TCH/SDCCH_A_IF_Fail_Call • TCH/SDCCH_A_IF_Fail_Old • TCH_TR_Fail (only for TCH channel) • TCH_TR_Fail_Old (only for TCH channel) • TCH_Act_Fail_Call(only for TCH channel) • TCH/SDCCH_LAPD_Fail • TCH/SDCCH_BTS_Fail • TCH/SDCCH_User_Act • TCH/SDCCH_Net_Act • TCH/SDCCH_BCSU_Reset

8. SDCCH useful counters MS accessing, SDCCH Requests SDCCH ACCESSES REJECTED IN BSC RACH on CCCH /c3004 ch_req_msg_rec SDCCH FAILURES sdcch_abis_fail_call AND OTHER FAILURES BEFORE ESTABL. INDICATION (incl.IMSI detach) REJECTED DUE TO ILLEGAL EST.CAUSE ghost_ccch_res (corrupted msgs, failed chan.act.) small part of failures other than sdcch_abis_* failures SDCCH- SDCCH HO ASSIGNMENTS FOR CALLS,LU,SS sdcch_assign TRUE SDCCH SEIZURES TRUE SDCCH SEIZURES FOR CALL,SMS,SS SDCCH REQUESTS /c1000 sdcch_seiz_att CALL RE-EST. sdcch_call_re_est MOC (incl.SMS) succ_seiz_orig SEIZURES FOR HO sdcch_ho_seiz EMERGENCY CALL sdcch_emerg_call MTC (incl.SMS) succ_seiz_term TCH TRUE SDCCH SEIZURES FOR CALL & SS - succ_sdcch_sms_est - unsucc _sdcch_sms_est BLOCKED sdcch_busy_att LOCATION UPDATE sdcch_loc_upd Normal LU Periodic LU IMSI attach

9. SDCCH Drop calls One of these triggered Cell A EMERGENCY CALL sdcch_emerg_call SDCCH Call drops one of SDCCH fail counters is triggered SDCCH_RADIO_FAIL SDCCH_USER_AC SDCCH_BCSU_RESETSDCCH_NETW_ACT SDCCH_BTS_FAIL SDCCH_LAPD_FAIL SDCCH_A_IF_FAIL_CALL MOC (incl.SMS) succ_seiz_orig SDCCH REQUESTS sdcch_seiz_att SEIZURES FOR CALLS AND LU sdcch_assign MTC (incl.SMS) succ_seiz_term

10. TCH Requests BSC/BTS MS TCH SEIZURES FOR NEW CALL tch_norm_seiz BLOCKED CALLS tch_call_req -tch_norm_seiz -msc_o_sdcch_tch -bsc_o_sdcch_tch DR OUT SUCC msc_o_sdcch_tch +bsc_o_sdcch_tch TCH REQUESTS FOR NEW CALL tch_call_req TCH REQUESTS tch_request TCH REQUESTS FOR HO tch_request -tch_call_req -tch_fast_req BLOCKED HO’S tch_request -tch_call_req -tch_fast_req -tch_ho_seiz TCH SEIZURES FOR HO tch_ho_seiz TCH REQUESTS FOR FCS tch_fast_req TCH FCS SEIZURE ATTEMPTS tch_seiz_att_due_sdcch_con TCH FCS SEIZURES tch_seiz_due_sdcch_con BLOCKED TCH FCS SEIZURES tch_seiz_att_due_sdcch_con -tch_seiz_due_sdcch_con

11. TCH Drop Calls One of these triggered Cell A EMERGENCY CALL sdcch_emerg_call TCH REQUESTS FOR NEW CALL tch_call_req TCH SEIZURES FOR NEW CALL tch_norm_seiz TCH REQUESTS tch_request MOC (incl.SMS) succ_seiz_orig SEIZURES FOR CALLS AND LU sdcch_assign SDCCH REQUESTS sdcch_seiz_att MTC (incl.SMS) succ_seiz_term Call drops TCH DROPS TCH_RADIO_FAIL TCH_RF_OLD_HO TCH_ABIS_FAIL_CALL TCH_ABIS_FAIL_OLD TCH_A_IF_FAIL_CALL TCH_A_IF_FAIL_OLD TCH_TR_FAIL TCH_TR_FAIL_OLD TCH_LAPD_FAIL TCH_BTS_FAIL TCH_USER_ACT TCH_BCSU_RESET TCH_NETW_ACT TCH_ACT_FAIL_CALL

12. BTS Drop call analysis, useful KPIs(counters) and formulas tch_radio_fail_old tch_radio_fail tch_abis_fail_call tch_a_if_fail_call tch_abis_fail_old tch_a_if_fail_old BSC TC tch_bcsu_reset tch_user_act tch_netw_act tch_act_fail_call tch_tr_fail_old tch_tr_fail

13. Drop call analysis, useful KPIs(counters) and formulas • TCH/SDCCH Drop Call Rate (DCR_4f) Drop Call (DCR_4f):100*Sum([TCH_RADIO_FAIL]+[TCH_RF_OLD_HO]+[TCH_ABIS_FAIL_CALL]+[TCH_ABIS_FAIL_OLD]+[TCH_A_IF_FAIL_CALL]+[TCH_A_IF_FAIL_OLD]+[TCH_TR_FAIL]+[TCH_TR_FAIL_OLD]+[TCH_LAPD_FAIL]+[TCH_BTS_FAIL]+[TCH_USER_ACT]+[TCH_BCSU_RESET]+[TCH_NETW_ACT]+[TCH_ACT_FAIL_CALL]) / Sum([TCH_NORM_SEIZ]+[TCH_SEIZ_DUE_SDCCH_CON]+[MSC_I_SDCCH_TCH]+[BSC_I_SDCCH_TCH]+[CELL_SDCCH_TCH]+[MSC_I_TCH_TCH]+[BSC_I_TCH_TCH] - [MSC_O_TCH_TCH]-[BSC_O_TCH_TCH])

14. Drop call analysis, useful KPIs(counters) and formulas • UL and DL Quality distributions UL Qual 0-4: 100*Sum(FREQ_UL_QUAL0]+[FREQ_UL_QUAL1]+[FREQ_UL_QUAL2]+[FREQ_UL_QUAL3]+[FREQ_UL_QUAL4])/Sum([FREQ_UL_QUAL0]+[FREQ_UL_QUAL1]+[FREQ_UL_QUAL2]+[FREQ_UL_QUAL3]+[FREQ_UL_QUAL4]+[FREQ_UL_QUAL5]+[FREQ_UL_QUAL6]+[FREQ_UL_QUAL7]) DL Qual 0-4: 100*Sum(FREQ__DL_QUAL0]+[FREQ_DL_QUAL1]+[FREQ_DL_QUAL2]+[FREQ_DL_QUAL3]+[FREQ_DL_QUAL4])/Sum([FREQ_DL_QUAL0]+[FREQ_DL_QUAL1]+[FREQ_DL_QUAL2]+[FREQ_DL_QUAL3]+[FREQ_DL_QUAL4]+[FREQ_DL_QUAL5]+[FREQ_DL_QUAL6]+[FREQ_DL_QUAL7]) or Run 196 report to check UL and DL per TRX distribution

15. Drop call analysis, common problems Hardware and transmission fault -> check TCH drop reason, TCH availability and transmission. Interference -> Check possible interference by using Mapinfo, Check UL and DL quality, site too high? (check TA-232 distribution report) Coverage problem/Island site Handover problem -> To check if any potential neighbours is not defined or missing of neighbour relation Wrong feeder connection Neighbour site down

16. Optimization process, Worse TCH Drop Rate Daily Top 10 or 20 Worse TCH/SDCCH DCR performance cells Hardware fault RF problems Check BTS alarm Check BCCH missing Refer KPIs trends like Calls, TCH drop rate and reason of drop, UL and DLquality, UL interference band, Handover performance, call distance, CSSR…. Yes No Report to OMC Yes Majority drop due to TR_Fail, A_IF_Fail_Call, BTS No Check frequency plan, neighbor site status (site down?), site to site distance (232 report), antenna height and antenna tilting - Mapinfo or Prediction tools Discuss with AIS’s Optimization team and Planning team. Issue work order for any suggestions. Yes Suggestion for improvement No Conduct drive test

17. Optimization process, Worse HO performance Daily Top 10 or 20 Worse handover performance cells Hardware fault RF problems Check BTS alarm Check BCCH missing Refer to handover reason, UL and DL quality, UL interference band Yes No Report to OMC Check 153 HO report to find out majority failures towards which cells? Possible reasons: Target cell has co-channel/Adj channel interference, coverage gaps, hardware failure, neighbor BCCH/BSIC frequency not updated, wrong CGI format in MSC, wrong HO number in MSC, Non-symmetric HO relations, synchronization problem, excessive UL interference, site too high, Direct Retry traffic cause high HO Failures(KTU13). Yes Discuss with AIS’s Optimization team and Planning team. Issue work order for any suggestions. Suggestion for improvement No Conduct drive test

18. Optimization process, lowest TCH Availabilty Daily Top 10 or 20 lowest TCH Availability >= 2 days Hardware fault Check BTS alarm Check BCCH missing No Yes Accidentally blocked by user? Report to OMC

19. Daily trends PLMN, BSC, Worse Cells monitoring by individual BSC responsible engineers Weekly or Daily Activities Detail analysis and suggestions for improvements Issue work order and monitor performance Import into AIS database 519/153 report from NMS Discussion with AIS’s engineers for any suggestions

20. Iterative process to improve network quality Frequency Retune - 1/1, 2/2 or 3/3 reused…Depends on traffic loading and number of frequenies in the MA list. Use of frequency hopping…consider to use/trial TRP = 2 (TCH/Hopping preferred) - Improve DCR - Degrade UL/DL quality( 0- 4)…acceptable!!! Optimise Parameter setting - BTS Power control…to perform trial! - TRP setting….per area basics - Quality margin handover (QMRG)….different setting in rural, suburban and urban area - QDR/QUR setting for hopping cells - Power budget handover (PBGT) …different setting in rural, suburban and urban area.