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KPI Optimization in GSM

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 ALUMS‐OMP‐L2‐014 ALUMS OPERATIONAL PROCESS MANUAL   
                            EDITION 1.2           EFFECTIVE DATE: 01January  2011 
 
 
 
 
 
 
 
KPI Optimization Process 
Appendix‐3  
refers to page 15 of Network Performance Monitoring & Optimization Process 
Huwaei 
 ALUMS‐OMP‐L2‐014 ALUMS OPERATIONAL PROCESS MANUAL   
                            EDITION 1.2           EFFECTIVE DATE: 01January  2011 
 
 
PROCESS for SDCCH Assignment Success Rate Optimization:
Definition: When From the MS SDCCH Request is sent to Base Station and if MS
successfully gets the SDCCH in response SDCCH Assignment has done successfully.
PROCESS for Optimization:
1. Identify the Bad performing Cells for SDCCH Assignment Success Rate
2. Take the detailed report showing (Ex. Total SDCCH Assignment Request, Total SDCCH
Assignment Successful)
3. Follow the below mentioned Process after Analyzing detailed report...
4. From Report Check whether you have Idle SDCCH available in cell or not for SDCCH
Assignment; because the Main factor for lowering SDCCH Assignment success rate is
SDCCH congestion.
5. SDCCH Congestion:
a. Check The SDCCH Requests (Immediate Assignment Measurement Per Cell
Report form M200)
b. Ex. Call purpose, SMS, Location Update
c. If you find High SDCCH Request and low TCH utilization Check “SDCCH
Dynamic Allocation Allow” feature is enabled or not? if not enable this feature.
d. If you have very High SDCCH Request for Location Updating; optimize the LAC
boundary.
e. Only For some exceptional cases you can increase the Static SDCCH Time Slots.
6. Check Hardware/Transmission alarms; Resolve if find any.
7. Audit for any parameters related discrepancies and define as per standard parameters set.
8. RF and Environmental Factors:
a. Low Coverage Areas (Try to reduce low coverage patches with physical
optimization; New sites)
b. Interference/ Bad quality/ UL-DL Imbalance;
c. Check the states for TRx on which SDCCH is configured can be issue of TRx
also; Change TRx if you found random behavior of TRx.
9. After all rectification observe the subsequent days report if you still find the problem
repeat the same process with due care to Pin Point the actual cause.
 ALUMS‐OMP‐L2‐014 ALUMS OPERATIONAL PROCESS MANUAL   
                            EDITION 1.2           EFFECTIVE DATE: 01January  2011 
 
 
Fish bone diagram for the root cause analysis high SDCCH congestion rate
PROCESS for SDCCH DROP Rate Optimization:
Definition: When MS is already on SDCCH and in-between communication with Base
station SDCCH channel got disconnected abruptly then SDCCH Drop has occurred.
PROCESS for Optimization:
1. Identify the Bad performing Cells for SDCCH Drop Rate
2. Take the detailed report showing (Ex. Total SDCCH Assignment Successful, Total
SDCCH Dropped)
 ALUMS‐OMP‐L2‐014 ALUMS OPERATIONAL PROCESS MANUAL   
                            EDITION 1.2           EFFECTIVE DATE: 01January  2011 
 
 
3. Follow the below mentioned Process after Analyzing detailed report...
4. The Main Reasons for High SDCCH Drop Rate are improper Parameters Configuration
and Bad RF & Environmental factors.
5. First Audit for any parameters related discrepancies and define as per standard
parameters set.
6. Check for Neighbor Relations and correct if it is not proper.
7. For counter level analysis refer “Call Drop Measurement per Cell” report from M2000.
8. Low Coverage: Through Drive Test Find out the low coverage patched and try to
improve with physical optimization; New site; coverage enhancement features for some
cases(Ex. Power Boost Tech, No Combining, TMA/TMB)
9. Interference: Check for interference from repeaters, Intra-Network interference due to
aggressive reuse or improper Freq., Inter-Network can also be the case. Find out the
actual cause and rectify it.
10. Antenna System: High VSWR due to feeders, Improper antenna configuration(Ex. Sector
cable Swap)
11. Check for Hardware Issue and rectify if you found any.
12. After the activity check the subsequent days report and repeat the procedure for pin
pointing the actual cause.
 
 
Fish bone diagram for the root cause analysis for high SDCCH drop rate
 ALUMS‐OMP‐L2‐014 ALUMS OPERATIONAL PROCESS MANUAL   
                            EDITION 1.2           EFFECTIVE DATE: 01January  2011 
 
 
PROCESS for RACH (Random Access Channel) Success Rate
Optimization:
Definition: Random Access Channel (RACH) is used by the MS on the “uplink” to request
for allocation of an SDCCH. This request from the MS on the uplink could either be as a page
response (MS being paged by the BSS in response to an incoming call) or due to user trying to
access the network to establish a call. For all services there will CH REQ (Channel Request)
from MS and in the response of CH REQ if MS will get the IMM ASS CMD (Signaling Ch)
Access to system is successful. Nature of this Access REQ is random so it is call Random Access
Channel Request.
PROCESS for Optimization:
1. Identify the Bad performing Cells for RACH Success Rate
2. Take detailed report and analyze for no of failure of Request and failures.
3. The main reasons for bad RACH success rate could be access from very distant place
with very low coverage; Parameters Configuration discrepancies.
4. First Check for Parameters Configuration discrepancies and correct as per standard
parameter set.
5. The main parameters to look for Huawei
a. “MS MAX Retrans” can set depending upon Traffic and Clutter.
b. “Tx-Interger” will reduce the RACH collision and can improve RACH success
rate.
c. “T3122” waiting time for next network access.
d. “RACH Min.Access Level(dbm)” very important parameter for low coverage
rural areas.
e. “CCCH conf” & “BS_AG_BLKS_RES” check properly defined or not? Because
if you have overload with AGCH “IMM ASS” can’t be send in the response of
CH REQ.
6. Check for Hardware Issues (Ex. BTS sensitivity has very crucial role to play here)
7. Check for Uplink Interference and quality.
8. Check for UL-DL imbalance and correct if any problem.
 ALUMS‐OMP‐L2‐014 ALUMS OPERATIONAL PROCESS MANUAL   
                            EDITION 1.2           EFFECTIVE DATE: 01January  2011 
 
 
9. After the activity check the subsequent days report and repeat the procedure for pin
pointing the actual cause. 
 
 
Fish Bone diagram for the root cause analysis of poor Random Access Success
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