Nokia Radio Network Planning, Southern Region
AgendaIntroduction of NETWORK PERFORMANCE tools (AIS
Access Database for Optimization) Brief on main KPI formulasDrop call analysisSDCCH and TCH counters and meaningExplanation 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 performanceDiscuss 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 toolsNetwork 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
SDCCH REQUESTS/c1000sdcch_seiz_att
ASSIGNMENTS FOR CALLS,LU,SS
sdcch_assign
BLOCKED
sdcch_busy_att
RACH on CCCH/c3004
ch_req_msg_recREJECTED DUE TO ILLEGAL EST.CAUSE
ghost_ccch_res
AND OTHER FAILURES BEFORE ESTABL. INDICATION(incl.IMSI detach)
MOC (incl.SMS)
succ_seiz_orig
MTC (incl.SMS)
succ_seiz_term
CALL RE-EST.
sdcch_call_re_est
LOCATION UPDATEsdcch_loc_upd
EMERGENCY CALL
sdcch_emerg_call
SDCCH ACCESSES REJECTED IN BSC
TRUE SDCCH SEIZURES
SEIZURES FOR HO
sdcch_ho_seiz
SDCCH FAILURES
sdcch_abis_fail_call (corruptedmsgs, failed chan.act.)
TRUE SDCCH SEIZURES FOR CALL,SMS,SS
TRUE SDCCH SEIZURES FOR CALL & SS- succ_sdcch_sms_est- unsucc _sdcch_sms_est
other than sdcch_abis_* failures
small part of failures
Normal LU
Periodic LU
IMSI attach
MS accessing,
TCH
SDCCH-SDCCH HO
SDCCH Requests
Nokia Radio Network Planning, Southern Region
SDCCH REQUESTS
sdcch_seiz_att
SEIZURES FOR CALLS AND LU
sdcch_assign
MOC (incl.SMS)
succ_seiz_orig
MTC (incl.SMS)
succ_seiz_term
EMERGENCY CALL
sdcch_emerg_call
Cell A
one of SDCCH fail counters is triggered
SDCCH_RADIO_FAILSDCCH_USER_ACSDCCH_BCSU_RESETSDCCH_NETW_ACTSDCCH_BTS_FAILSDCCH_LAPD_FAILSDCCH_A_IF_FAIL_CALL
One of these triggered
SDCCH Call drops
SDCCH Drop calls
Nokia Radio Network Planning, Southern Region
TCH REQUESTS
tch_request
TCH REQUESTSFOR NEW CALL
tch_call_req
TCH SEIZURES FORNEW CALL
tch_norm_seiz
TCH SEIZURES FORHO tch_ho_seiz
DR OUT SUCC
msc_o_sdcch_tch+bsc_o_sdcch_tch
BLOCKED CALLS
tch_call_req-tch_norm_seiz -msc_o_sdcch_tch-bsc_o_sdcch_tch
TCH REQUESTSFOR HO
tch_request-tch_call_req-tch_fast_req
BLOCKED HO’S
tch_request -tch_call_req-tch_fast_req -tch_ho_seiz
TCHREQUESTSFORFCS
tch_fast_req
TCH FCS SEIZURE ATTEMPTS
tch_seiz_att_due_sdcch_conTCH FCS SEIZURES
tch_seiz_due_sdcch_con
BLOCKEDTCH FCS SEIZUREStch_seiz_att_due_sdcch_con-tch_seiz_due_sdcch_con
MS BSC/BTSTCH Requests
Nokia Radio Network Planning, Southern Region
SDCCH REQUESTS
sdcch_seiz_att
SEIZURES FOR CALLS AND LU
sdcch_assign
MOC (incl.SMS)
succ_seiz_orig
MTC (incl.SMS)
succ_seiz_term
EMERGENCY CALL
sdcch_emerg_call
Cell A One of these triggered
TCH REQUESTS
tch_request
TCH REQUESTSFOR NEW CALL
tch_call_req
TCH SEIZURES FORNEW CALL
tch_norm_seiz
Call drops
TCH Drop Calls
TCH DROPS
TCH_RADIO_FAILTCH_RF_OLD_HOTCH_ABIS_FAIL_CALLTCH_ABIS_FAIL_OLDTCH_A_IF_FAIL_CALLTCH_A_IF_FAIL_OLDTCH_TR_FAILTCH_TR_FAIL_OLDTCH_LAPD_FAILTCH_BTS_FAILTCH_USER_ACTTCH_BCSU_RESETTCH_NETW_ACTTCH_ACT_FAIL_CALL
Nokia Radio Network Planning, Southern Region
Drop call analysis, useful KPIs(counters) and formulas
BSCTCBTS
tch_radio_fail_oldtch_radio_fail
tch_abis_fail_calltch_abis_fail_old
tch_a_if_fail_old
tch_a_if_fail_call
tch_tr_fail_old tch_tr_failtch_bcsu_resettch_user_acttch_netw_acttch_act_fail_call
Nokia Radio Network Planning, Southern Region
Drop call analysis, useful KPIs(counters) and formulasTCH/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])
Nokia Radio Network Planning, Southern Region
Drop call analysis, useful KPIs(counters) and formulasUL 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
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
Daily Top 10 or 20 Worse TCH/SDCCH DCR performance cells
Hardware fault RF problems
Check BTS alarm Check BCCH missing
Report to OMC
YesNo
Check frequency plan, neighbor site status (site down?), site to site distance (232 report), antenna height and antenna tilting - Mapinfo or Prediction tools
No
Refer KPIs trends like Calls, TCH drop rate and reason of drop, UL and DLquality, UL interference band, Handover performance, call distance, CSSR….
Majority drop due to TR_Fail, A_IF_Fail_Call, BTSYes
Suggestion for improvement
Conduct drive test
Yes
No
Optimization process, Worse TCH Drop Rate
Discuss with AIS’s Optimizationteam 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
Report to OMC
YesNo
Possible reasons: Target cell has co-channel/Adj channel interference, coverage gaps, hardware failure, neighbor BCCH/BSICfrequency 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).
Refer to handover reason, UL and DL quality, UL interference band
Check 153 HO report to find out majority failurestowards which cells?
Suggestion for improvement
Conduct drive test
Yes
No
Discuss with AIS’s Optimizationteam 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
Hardware fault
Check BTS alarm Check BCCH missing
Report to OMC
>= 2 days
Yes
No
Accidentally blocked by user?
Nokia Radio Network Planning, Southern Region
519/153 report from NMS
Weekly or Daily ActivitiesImport into
AIS database
Issue work order and monitor performance
Daily trends PLMN, BSC, Worse Cells monitoringby individual BSC responsible engineers
Detail analysis and suggestions for improvements
Discussion with AIS’s 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 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.