The LTE network optimization work done resulted in improved mobility and uplink traffic performance. Scheduling request and CQI resources were tuned on worst sites, reducing PUCCH congestion to 0 and increasing uplink traffic by 10GB on average. Inactivity timers were tuned on worst sites from 61s to 10s, improving initial connection success rates and eliminating RRC and handover preparation failures related to CU limitations. These parameter tunings addressed issues on worst performing sites.

1. Network Optimisation: LTE Tuning networkwide
PARAMETER WORKS DONE
1. Tune the Scheduling Requests (SR) Resources from 160 to 320 on selected worst sites
2. Tune CQI Resources from 160 to 320 on selected worst sites
3. Definitions of WVEMME01 TermPointToMme done on some LTE sites
4. Definitions of X2 IPs on TermPointToENB done on worst sites with poor Mobility KPIs
5. Inactivity timer tuning done on the worst sites from 61s to 10s
6. Upgrade on the CU license done on some sites
FEATURE ACTIVATION WORKS DONE
1. 256-QAM Downlink
2. Automated RACH Root Sequence Allocation
3. Contention Free Random Access
4. PSHO-Based CS Fallback to UTRAN

2. Network Optimisation: LTE RECOMMENDED FEATURES FOR IMPROVED PERFOMANCE
RECOMMENDED FEATURES NEEDED
1. 4x2 Quad Antenna Downlink Performance Package
2. 4x4 Quad Antenna Downlink Performance Package
3. Quad Antenna Uplink Performance Package
4. Adjustable CRS Power
5. Enhanced PDCCH Link Adaptation
6. TTI Bundling (VOLTE)
7. Prescheduling (VOLTE)
8. PDCCH Power Boost
9. Prioritized SR Scheduling
10. Minimization of Drive Tests
11. Dynamic PUCCH
12. Minimum Rate Proportional Fair Scheduler
13. Multi-Target RRC Connection Re-Establishment (VOLTE)

3. Definitions of WVEMME01 TermPointToMme done on 6 sites
Definitions of X2 IPs on TermPointToENB done on worst sites with poor Mobility KPIs
Change request implemented on the 15th and 18th April 2016
Ericsson LTE network Mobility Success Rate improved from 88% to 98%
S1 Handover Success rate on wvemme01 improved greatly from 3% to 98%
 Improvement observed on mobility KPIs on all the worst sites
Improvement on
LTE Network Mobility
LTE Network – TermPointToMme configurations

4. S1 Handover failure rate on wvemme01 improved tremendously from 98% to 3% after the tuning
S1 Handover Success rate on wvemme01 improved greatly from 3% to 98%
Improvement on
Mobility Success
Rate
LTE Cluster Level Analysis – WVEMME01 S1 HANDOVER KPIs

5. LTE Handover preparation success rate on the network level improved from 92% to 98% after the tuning
Number of successful intra LTE handover preparations have improved on all the worst sites
Improvement on
LTE Network Handover
Preparation Success
LTE NETWORK – Handover Preparation Success Rate%

6. IMPROVEMENT ON WORST LTE SITES HIGHLIGHTED IN
BELOW SLIDES

7. 22 Worst sites mobility KPIs improved after the tuning done
Below indicates the worst sites statistics indicating the improvement in green color (above 96%)
LTE WORST SITES – MOBILITY SUCCESS RATE

8. Mobility Success rate on Nhaka Parade & Coppa Cabbana LTE site improved greatly from 60% to 99%
Improvement on
Accessibility KPIs
Improvement on
Mobility Success
Rate
Improvement on
Mobility Success
Rate
Nhaka Parade & Coppa Cabbana LTE_Mobility KPIs

9. Mobility Success rate on Club Chambers LTE site improved greatly from 80% to 98%
Mobility Success rate on Charge Office LTE site improved greatly from 85% to 98%
Improvement on
Mobility Success
Rate
Improvement on
Mobility Success
Rate
Club Chambers & Charge Office LTE Mobility KPIs

10. Improvement on
Mobility Success
Rate
Improvement on
Mobility Success
Rate
Mobility Success rate on KK Tiles LTE site improved greatly from 75% to 98%
Mobility Success rate on Pollack LTE site improved greatly from 82% to 98%
KK Tiles & Pollack LTE Mobility KPIs

11. Improvement on
Mobility Success
Rate
Improvement on
Mobility Success
Rate
Mobility Success rate on Mupedzanhamo LTE site improved greatly from 80% to 98%
Mobility Success rate on Pollack LTE site improved greatly from 92% to 98%
Mupedzanhamo & Zesa Wynne Street Mobility KPIs

12. Conclusion
WVEMME01 S1 Handover Success rate improved tremendously from 3% to 98% after the tuning
Intra-LTE handover Success rate on the network level improved from 88% to 98% after the tuning
LTE Network Handover preparation success rate on the network level improved from 92% to 98% after the tuning
 mobility KPIs improved on 22 Worst sites after the tuning done

13. Network Optimisation: LTE PUCCH CQI/SR RESOURCES TUNING
WORKS DONE
1. Tune the Scheduling Requests (SR) Resources from 160 to 320 on selected worst sites – 6th July 2017
2. Tune CQI Resources from 160 to 320 on selected worst sites – 6th July 2017
Expected Results
• Improvement in CQI and SR resource congestion
• Improvement in uplink Traffic

14. LTE Cluster Level Analysis – SCHEDULING REQUEST CONGESTION
• PUCCH (Physical uplink control channel) Scheduling request congestion decreased from avg 80000 to 0 after optimizing SR
(scheduling request) resources on selected worst sites
• PUCCH SR congestion indicates the number of times a PUCCH allocation request for SR resource(s) could not be granted

15. LTE Cluster Level Analysis – CQI CONGESTION
• PUCCH (Physical uplink control channel) CQI congestion decreased from avg 100000 to 0 after optimizing CQI resources
• PUCCH CQI congestion indicates the number of times a PUCCH allocation request for CQI resource(s) could not be granted

16. LTE Cluster Level Analysis – SCHEDULING REQUEST FAILURES
• Scheduling Request Failures have decreased from 19000 to less than 9000 after the tuning
• Scheduling request failures indicates the number of received Scheduling Requests (SR) over RACH due to a
failure from the UE to access the node by means of SR over PUCCH.

17. LTE Cluster Level Analysis – UPLINK TRAFFIC
• Uplink Traffic increased from average of 100GB to 110GB after the PUCCH CQI/SR resources tuning

18. LTE Cluster Level Analysis – ACCESSIBILITY
• Initial ERAB Establishment Success improved marginally after the tuning

19. SUMMARY
• LTE Uplink Traffic increased from average of 100GB to 110GB after the PUCCH CQI/SR resources tuning
• PUCCH (Physical uplink control channel) Scheduling request congestion decreased from avg 80000 to 0 after optimizing SR
(scheduling request) resources on selected worst sites
• PUCCH (Physical uplink control channel) CQI congestion decreased from avg 100000 to 0 after optimizing CQI resources
• Scheduling Request Failures have decreased from 19000 to less than 9000 after the tuning
• Initial ERAB Establishment Success improved marginally after the tuning

20. Inactivity timer tuning done on the worst sites from 61s to 10s on the 16th February 2016
Upgrade on the CU license done on the 19th February 2016
Improvement on initial E-RAB establishment success rate after the tuning
RRC failures due to limitations on the CU on the network level have been cleared from an average of 24000 to 0
HO preparations due to limitations on the CU license on the network level have all been cleared from an average of 10000 to 0
Improvement on
RRC Failiures
Improvement on
RRC Failiures
Upgrade of CU
License done
Upgrade of CU
License done
LTE Network Optimisation: INACTIVITY TIMER TUNING

21. IMPACT ON WORST SITES BELOW

22. Improvement on initial E-RAB establishment success rate after the tuning to 99%
RRC failures due to limitations on the CU on the network level have been cleared from an average of 8500 to 0
HO preparations due to limitations on the CU license on the network level have all been cleared from an average of 6200 to 0
Improvement on E-RAB drop rate from 8% to 3%
Improvement on
Accessibility KPIs
Improvement on
HO Preparation
failures
LTE Network Optimisation: GLEN VIEW PIONEERs SITE

23. Improvement on initial E-RAB establishment success rate after the tuning from 90% to 98%
RRC failures due to limitations on the CU on the network level have been cleared from an average of 2400 to 0
HO preparations due to limitations on the CU license on the network level have all been cleared from an average of 11000 to 0
Improvement on E-RAB drop rate from 8% to 2.5%
Improvement on
Accessibility KPIs
Improvement on
RRC Failiures
Improvement on
HO Preparation
failures
LTE Network Optimisation: NKWISI PARK

24. Improvement on initial E-RAB establishment success rate after the tuning from average of 97.5 to 99%
RRC failures due to limitations on the CU on the network level have been cleared from an average of 24000 to 0
HO preparations due to limitations on the CU license on the network level have all been cleared from an average of 10000 to 0
Slight degradation on the E-RAB drop from 1.1 to
1.8%
Improvement on
Accessibility KPIs
Improvement on
HO Preparation
failures
Improvement on
RRC Failiures
LTE Network Optimisation: ZIMRE PARK