Transcript RRC Success Rate and RRC Drop Analysis Zante

RRC Success Rate and RRC Drop
Analysis
Cluster Zakynthos(Zante)
Wind CSFB and Data Statistics showing poor
RRC Setup Success and RRC Drop Rate
Class
4G Retainability
4G Accessibility
4G Accessibility
4G Retainability
4G Mobility
4G Mobility
4G Accessibility
4G Accessibility
4G Accessibility
4G Accessibility
4G Accessibility
4G Accessibility
Key Performance Indicator
Total Number of Calls(DT-FTP DL)
FTP Peak Application
Throughput (DL) _DT
FTP Mean Application
Throughput (DL)_DT
Session Failure Ratio_DT
RRC Setup Success Rate
RRC Connection Setup Time (ms)
RRC Drop Rate
LTE Intrarfreq HO Success Rate
LTE Interrfreq HO Success Rate
CSFB Setup Success Rate Towards 3G
CSFB Setup Success Rate Towards 2G
CSFB Redirection Time Towards 3G
CSFB Setup Time Towards 3G
CSFB Redirection Time Towards 2G
CSFB Setup Time Towards 2G
4G Accessibility
LTE Reselect Time after CSFB
Throughput
Throughput
Range
handoverFailure
otherFailure
Service
Data Call Statistics
Analysis (DT)
Wind LTE DATA - Time Binning (1000 ms)
Criteria
FTP Peak Application
Throughput (DL) _DT>=Current NW value(kbps)
FTP Mean Application
Throughput (DL)_DT>=Current NW value
Session Failure Ratio_DT<=Current NW value
CSFB Analysis
LTE_Uu_RRC_RRCConnectionReestablishmentRequest_reestablishmentCause
172
98
Preswap
n/a
Afterswap
272
n/a
80246.13281
n/a
13967.04909
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
4.41%
37.10%
86
55.26%
88.32%
94.23%
98.49%
98.33%
848.3339161
6574.424825
1825.402256
10542.69737
n/a
171524.0294
Comments
few CSFB Calls with reselection back to LTE > 500s(~30s with these calls
excluded)
Vodafone CSFB and Data Statistics showing
poor RRC Setup Success and RRC Drop Rate
Class
4G Retainability
4G Accessibility
4G Accessibility
4G Retainability
4G Mobility
4G Mobility
4G Accessibility
4G Accessibility
4G Accessibility
4G Accessibility
4G Accessibility
4G Accessibility
Key Performance Indicator
Total Number of Calls(DT-FTP DL)
FTP Peak Application
Throughput (DL) _DT
FTP Mean Application
Throughput (DL)_DT
Session Failure Ratio_DT
RRC Setup Success Rate
RRC Connection Setup Time (ms)
RRC Drop Rate
LTE Intrarfreq HO Success Rate
LTE Interrfreq HO Success Rate
CSFB Setup Success Rate Towards 3G
CSFB Setup Success Rate Towards 2G
CSFB Redirection Time Towards 3G
CSFB Setup Time Towards 3G
CSFB Redirection Time Towards 2G
CSFB Setup Time Towards 2G
4G Accessibility
LTE Reselect Time after CSFB
Throughput
Throughput
Range LTE_RRCConnectionAttempt
1
1111
Service
Data Call Statistics
Analysis (DT)
Vodafone LTE DATA - Time Binning (1000 ms)
Criteria
FTP Peak Application
Throughput (DL) _DT>=Current NW value(kbps)
FTP Mean Application
Throughput (DL)_DT>=Current NW value
Session Failure Ratio_DT<=Current NW value
CSFB Analysis
Range LTE_RRCConnectionSetupFail
1
911
Preswap
n/a
Afterswap
114
n/a
54285.05469
n/a
9374.640653
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
11.40%
17.82%
85
23.57%
93.57%
n/a
99.49%
100.00%
207.469163
5191.259912
187.8888889
9951.5
n/a
56097.7891
Comments
few CSFB Calls with reselection back to LTE > 70s, Average~ 30s with
abnormal values excluded
For both Wind and Vodafone Cell Radius is up
to 15km which is normal value for LTE1800.
Wind RRC Setup Failures and RRC Drops map – big
number of failures, randomly spread.
Vodafone RRC Setup Failures and RRC Drops map –
big number of failures, randomly spread.
Wind – Distance measured >15km in more than
60% of the route driven.
LTE_UE_Data_Wind-Distance (metres)
 >= 0.000000 to < 100.000000 (800) 1.3%
 >= 100.000000 to < 500.000000 (931) 1.5%
 >= 500.000000 to < 1000.000000 (944) 1.5%
 >= 1000.000000 to < 5000.000000 (7097) 11.4%
 >= 5000.000000 to < 10000.000000 (7942) 12.8%
 >= 10000.000000 to < 15000.000000 (7096) 11.4%
 >= 15000.000000 to < 20000.000000 (5744) 9.2%
 Above 20000.000000 (31569) 50.8%
Vodafone – Distance measured >15km in 60% of
the route driven.
LTE_UE_Data_VDF-Distance (metres)
 >= 0.000000 to < 100.000000 (801) 1.3%
 >= 100.000000 to < 500.000000 (931) 1.5%
 >= 500.000000 to < 1000.000000 (944) 1.5%
 >= 1000.000000 to < 5000.000000 (7092) 11.5%
 >= 5000.000000 to < 10000.000000 (7931) 12.8%
 >= 10000.000000 to < 15000.000000 (7072) 11.4%
 >= 15000.000000 to < 20000.000000 (5728) 9.3%
 Above 20000.000000 (31425) 50.7%
Conclusion
• RF Optimization is required for consistent cell coverage and
overshooting control
• Parameter adjustment is required e.g. cell radius in order some
distant servers with good coverage to provide coverage required.
• HO Parameters e.g. HO forbidden should be set on Cell to NB relation
in order distant servers not to be used and hence drops will be
avoided.
• Due to specific area – water and islands optimization of azimuths,
tilts, parameters and Network strategy should be adjusted in order to
improve Network performance.