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    Nokia GSM Optimization

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    ambroserf
    This document discusses tools and processes for monitoring and optimizing network performance in a GSM network. It provides an agenda covering key performance indicators (KPIs), drop call analysis, SDCCH/TCH counters, and the radio network optimization (RNO) process. An iterative process is described to maintain and improve network performance through daily monitoring, troubleshooting, optimization activities like parameter tuning, and drive testing.

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    Attribution Non-Commercial (BY-NC)
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    Nokia GSM Optimization

    Uploaded by

    ambroserf
    2K views20 pages
    This document discusses tools and processes for monitoring and optimizing network performance in a GSM network. It provides an agenda covering key performance indicators (KPIs), drop call analysis, SDCCH/TCH counters, and the radio network optimization (RNO) process. An iterative process is described to maintain and improve network performance through daily monitoring, troubleshooting, optimization activities like parameter tuning, and drive testing.

    Original Description:

    This document describe in details the steps in root cause analysis and solution for Nokia 2G/GSM

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    This document discusses tools and processes for monitoring and optimizing network performance in a GSM network. It provides an agenda covering key performance indicators (KPIs), drop call analysis, SDCCH/TCH counters, and the radio network optimization (RNO) process. An iterative process is described to maintain and improve network performance through daily monitoring, troubleshooting, optimization activities like parameter tuning, and drive testing.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PPT, PDF, TXT or read online from Scribd
    Download as ppt, pdf, or txt
    2K views20 pages

    Nokia GSM Optimization

    Uploaded by

    ambroserf
    This document discusses tools and processes for monitoring and optimizing network performance in a GSM network. It provides an agenda covering key performance indicators (KPIs), drop call analysis, SDCCH/TCH counters, and the radio network optimization (RNO) process. An iterative process is described to maintain and improve network performance through daily monitoring, troubleshooting, optimization activities like parameter tuning, and drive testing.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PPT, PDF, TXT or read online from Scribd
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    You are on page 1of 20

    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.

    Nokia Radio Network Planning, Southern Region

    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.

    Nokia Radio Network Planning, Southern Region

    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

    Nokia Radio Network Planning, Southern Region

    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


    Nokia Radio Network Planning, Southern Region

    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
    Nokia Radio Network Planning, Southern Region

    Drop Call Analysis

    Nokia Radio Network Planning, Southern Region

    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

    Nokia Radio Network Planning, Southern Region

    SDCCH useful counters


    MS accessing,

    SDCCH Requests
    SDCCH ACCESSES REJECTED IN BSC
    SDCCH FAILURES REJECTED DUE TO ILLEGAL EST.CAUSE
    ghost_ccch_res AND OTHER FAILURES BEFORE ESTABL. INDICATION (incl.IMSI detach) sdcch_abis_fail_call

    RACH on CCCH /c3004 ch_req_msg_rec

    (corrupted msgs, failed chan.act.)

    small part of failures other than sdcch_abis_* failures


    ASSIGNMENTS FOR CALLS,LU,SS TRUE SDCCH SEIZURES TRUE SDCCH SEIZURES FOR CALL,SMS,SS SDCCH REQUESTS /c1000 sdcch_seiz_att

    SDCCHSDCCH HO

    sdcch_assign
    MOC (incl.SMS) SEIZURES FOR HO succ_seiz_orig

    CALL RE-EST.
    sdcch_call_re_est

    sdcch_ho_seiz MTC (incl.SMS) BLOCKED succ_seiz_term EMERGENCY CALL TRUE SDCCH SEIZURES FOR CALL & SS - succ_sdcch_sms_est - unsucc _sdcch_sms_est

    TCH

    sdcch_emerg_call

    sdcch_busy_att LOCATION UPDATE sdcch_loc_upd Normal LU Periodic LU IMSI attach

    Nokia Radio Network Planning, Southern Region

    SDCCH Drop calls

    One of these triggered Cell A


    EMERGENCY CALL sdcch_emerg_call one of SDCCH fail counters is triggered MOC (incl.SMS) succ_seiz_orig SDCCH REQUESTS sdcch_seiz_att SEIZURES FOR CALLS AND LU sdcch_assign MTC (incl.SMS) succ_seiz_term SDCCH_RADIO_FAIL SDCCH_USER_AC SDCCH_BCSU_RESET SDCCH_NETW_ACT SDCCH_BTS_FAIL SDCCH_LAPD_FAIL SDCCH_A_IF_FAIL_CALL

    SDCCH Call drops

    Nokia Radio Network Planning, Southern Region

    MS
    TCH REQUESTS FOR NEW CALL
    tch_call_req

    TCH Requests
    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 SEIZURES FOR NEW CALL tch_norm_seiz

    BSC/BTS

    TCH REQUESTS tch_request TCH REQUESTS FOR HO tch_request -tch_call_req -tch_fast_req BLOCKED HOS 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

    Nokia Radio Network Planning, Southern Region

    TCH Drop Calls


    One of these triggered Cell A
    EMERGENCY CALL sdcch_emerg_call TCH REQUESTS FOR NEW CALL tch_call_req MTC (incl.SMS)

    MOC (incl.SMS)

    TCH REQUESTS tch_request

    TCH SEIZURES FOR NEW CALL tch_norm_seiz

    SDCCH REQUESTS sdcch_seiz_att

    SEIZURES FOR CALLS AND LU


    sdcch_assign

    succ_seiz_orig

    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

    Nokia Radio Network Planning, Southern Region

    Drop call analysis, useful KPIs(counters) and formulas


    tch_radio_fail_old tch_radio_fail tch_a_if_fail_call tch_a_if_fail_old tch_abis_fail_call tch_abis_fail_old

    TC

    BSC BTS
    tch_bcsu_reset tch_user_act tch_netw_act tch_act_fail_call
    Nokia Radio Network Planning, Southern Region

    tch_tr_fail_old tch_tr_fail

    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_FAI L_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_SDC CH_TCH]+[MSC_I_TCH_TCH]+[BSC_I_TCH_TCH] - [MSC_O_TCH_TCH]-[BSC_O_TCH_TCH])

    Nokia Radio Network Planning, Southern Region

    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_QUAL 3]+[FREQ_DL_QUAL4]+[FREQ_DL_QUAL5]+[FREQ_DL_QUAL6]+[FREQ_DL_QUAL7])

    or

    Run 196 report to check UL and DL per TRX distribution

    Nokia Radio Network Planning, Southern Region

    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

    Nokia Radio Network Planning, Southern Region

    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 Yes Refer KPIs trends like Calls, TCH drop rate and reason of drop, UL and DLquality, UL interference band, Handover performance, call distance, CSSR. Yes Majority drop due to TR_Fail, A_IF_Fail_Call, BTS

    No

    Report to OMC

    No Check frequency plan, neighbor site status (site down?), site to site distance (232 report), antenna height and antenna tilting - Mapinfo or Prediction tools Yes Suggestion for improvement No Conduct drive test Discuss with AISs Optimization team and Planning team. Issue work order for any suggestions.

    Nokia Radio Network Planning, Southern Region

    Optimization process, Worse HO performance


    Daily Top 10 or 20 Worse handover performance cells

    Hardware fault

    RF problems

    Check BTS alarm

    Check BCCH missing Yes Refer to handover reason, UL and DL quality, UL interference band

    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

    Suggestion for improvement


    No Conduct drive test

    Discuss with AISs Optimization team and Planning team. Issue work order for any suggestions.

    Nokia Radio Network Planning, Southern Region

    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

    Nokia Radio Network Planning, Southern Region

    Weekly or Daily Activities


    Import into AIS database

    Detail analysis and suggestions for improvements

    Issue work order and monitor performance

    519/153 report from NMS Daily trends PLMN, BSC, Worse Cells monitoring by individual BSC responsible engineers

    Discussion with AISs engineers for any suggestions

    Nokia Radio Network Planning, Southern Region

    Iterative process to improve network quality


    Frequency Retune - 1/1, 2/2 or 3/3 reusedDepends on traffic loading and number of frequenies in the MA list. Use of frequency hoppingconsider to use/trial TRP = 2 (TCH/Hopping preferred) - Improve DCR - Degrade UL/DL quality( 0- 4)acceptable!!! Optimise Parameter setting - BTS Power controlto 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.

    Nokia Radio Network Planning, Southern Region

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