Template for Case Writing——GTSCase Title KPI impact and Customer convincing Author Name Md. Abul Monsur Rezauddin/705625 The Related Project INTERNAL Bharti Airtel Phase II project (2010) KPI impact and Customer convincing Md. Abul Monsur Rezauddin/705625 Abstract：Customers are sometimes very strict on acceptance criterion, so acceptance condition need to fix after analyze the current network and swap strategy. It is very difficult to meet the benchmark KPI if the swap is not exactly same as before. So we need to convince customer that the KPI which has been given might not be achieved as because swap strategy has been changed and some KPI degradation should allow by customer as the swap is not same as before. Keywords：KPI relaxation, Customer communication Background Operator A is going to be leading operator in country B. Huawei has got 500 BTS swap in one region as well as expansion about 500 sites in this region. Operator is running with 15 MHz (only 1800 MHz) frequency band as they don’t have 900 MHz frequency band license. Later they got 5 MHz band license from EGSM and they had to sacrifice 5 MHz from 1800MHz. Now they want to deploy multi band site after swap which mean 900MHz & 1800MHz together. So before swap site configuration was single band and now after swap site configuration would be single band/ Dula Band/ Multi band. Description of problems or task There swap strategy is like this, if the site configuration is 444 (Only 1800MHz) now they will go for swap as 222(900MHz) + 222(1800MHz). And their understanding is that, before they had 15 MHz (1800 only) and now they have 5 MHz (900) +10 MHz (1800) =15 MHz, so there will be no impact on performance issue. Even though they are expecting better network performance compare to before. In addition to that current network performances are very good. There is very few call drops and handover success rate is also quite high. As they got 5 MHz from EGSM to enhance their maximum site configuration would be S222. Physical Tuning required to remove overshooting which need time to optimize. Increased cell coverage due to EGSM will increase the interference as well. Increase Cell coverage footprint: Present Network design is based on 1800 Band coverage. In some cells Channel other than the BCCH Band being used. 2.Template for Case Writing——GTS INTERNAL coverage. Change in BCCH band and Re-use pattern: For EGSM S222 will be used for whole network with 24 Channels. Al-most same activity required as New Network Plan. Strategies and Actions We analyzed the following things and represent to customer regarding every valid points due to new swap strategy: Present network status is below: Existing Network status Region Region 2 (R2) Total Number of BSC 17 Total Sites for Swap in R2 410 supplier M Frequency Band Used 1800 (Single Band Only) Total Channel Available 75 BCCH Pattern Used 6X3 (Staggered) TCH Pattern Used 1X3 Hopping type Used in TCH CHGR RF Hopping Total Number of TRX 5032 Sites with More Than S222 Configuration 324 We analyzed the following things and represent to customer: 1. maximum 1800 configuration would be S888 and rest of the channels will be used for IBS and other purposes. Analysis. . BCCH Pattern will be 5X3 (Blocked) where as in present 1800 band 6X3 pattern has been used. Moreover. definitely there is some impact on KPI. 15 (5X3) channels for BCCH and rest of them will be used for TCH agreed by both party. As after swap site configuration will be changes from single band to multi band. Cell traffic increase: as Cell coverage footprint increased so Cell Traffic may increase as well. Performance may degrade due to this external .Template for Case Writing——GTS INTERNAL Adjacent BCCH cannot be avoid where as there is no adjacency in Present 1800 BCCH Band. 4. No hopping gain in EGSM band: There is no Hopping gain in EGSM Band TCH. Some Data Provider/ISP etc also create interference in EGSM Band which is difficult to identify. Increased Traffic make degradation in Congestion. Cell edge users will affect badly 5. Uplink Interference will be increased as well. HO. so Multi-band tuning required. 6. Will suffer for interference as tighter re-use pattern 3/9 being used for EGSM TCH. and Call Quality and CDR performance. Network complexity will increased which required time to fix (Difficult to achieve proper tuned Multiband Network in Swap Phase). Difficult to maintain HO performance in a Multiband environment same as single band Network. Network quality will be not same as before. Implementation of sub-cell with different band: As coverage footprint has difference between EGSM & 1800 Band. As coverage increased with EGSM Band implementation and Tighter Re-Use pattern used interference will be higher. GSM1800 (total allocation = 75 channels) BCCH = 18 channels = 6*3 reuse pattern (Staggered plan) Existing frequency plan EGSM (total allocation = 25 channels) BCCH = 15 channels = 5*3 reuse pattern (Blocked) Swap frequency plan 3. External interference: Chance of external interference is higher in EGSM band due to close proximity with CDMA Band. Fig: C/I analysis existing with 1800MHz Fig: C/I analysis after implanted EGSM .Template for Case Writing——GTS INTERNAL We have done simulation comparing C/I analysis by U-Net in one uraban region. From the simulation it is observed that C/I better that 18 is reduced significantly from 79 to 47 due to limited frequency channel. Tuning activities for multiband implementation during swap will be same as new network tuning. Infected KPI for Implementing EGSM Band during Swap time: -Quality will be bad due to increase in interference -Performance of CSSR/SDCCH establishment rate may decrease due to interference -HO performance may degrade -Call drop rate may increase -Congestion both in TCH & SDCCH may increase due to increase in Traffic -Comparison between Pre-benchmark and Post-Benchmark will be not fair Therefore. or they should allow us some KPI relaxation which will be degraded due to EGSM band implementation. SDCCH establishment success rate. HO success rate. we proposed to customer either we can implement 1800 MHz first. comparing it with benchmark then we can go for EGSM band implementation. Network Topology/Structure will be different before and after swap. TCH drop rate and SDCCH drop rate) for benchmark comparison. SDCCH blocking rate. Moreover. TCH blocking rate.Template for Case Writing——GTS INTERNAL Result After analysis above thing we presented it to customer and tried to convince them regarding following points. Customer agreed that our point is valid and they relaxed all targeted KPI compare to benchmark value which is as follow: . customer provided us seven KPI (Assignment success rate. Template for Case Writing——GTS Existing KPI Huawei KPI TCH/RF ASR TCH rate assignment SDESR SDCCH success rate HOSR HOSR INTERNAL Condition success 95% of pre-swap performance Establishment 95% of pre-swap performance 95% of pre-swap performance . Suggestion or Review However. TCH congestion rate Case by case discussions if degrade. Cell level of KPI 4 & 5 monitoring target: more than 95% of cell which less than +2 % of existing performance. TCH RATE blocking Huawei KPI INTERNAL BLOCKING This relaxation KPI circulated to project team and it will be followed during acceptance. .Template for Case Writing——GTS Existing KPI SDCCH rate Condition SDCCH congestion rate Case by case discussions if degrade.5%. when there is target form the customer side analyze it carefully whether it achievable or not. We must go for better performance but when there is acceptance target we need to make it more flexible & clear as much as we can. Find out the difficulties and convince the customer about the point which is seems unrealistic. TCH drop rate TCH drop rate Pre-swap performance +0.5%. SD drop rate SDCCH drop rate Pre-swap performance +0. Cell level of KPI 4 & 5 monitoring target: more than 95% of cell which less than +2 % of existing performance.
Report "KPI Impact & Customer Convincing_Md_ Abul Monsur Rezauddin_705625_13122010"