Proposal for GSM Network Optimization & Audit-tsel

PT.Telkomsel Proposal for GSM Network Optimization September 2009 HS Overview Optimization is all actions intended to tune all aspects of the GSM network performance, covering access network, core network, and transmission network. Access network optimization procedure consists of two phases: cluster testing and system integration optimization. In other words, the initial pass of the RF optimization will be performed as a part of cluster tests: the second, more detailed, tuning phase will occur after completion of all cluster tests, which occur after activation of all cell sites in the GSM network. The primary reason for breaking the optimization work into two phases is to reduce the time and resources required to complete the cluster test cycles. -2- Objective • To ensure the achievement of acceptable coverage • To maximize the quality of service • To maximize the network efficiency (including load balancing) -3- Consideration • System stability and performance : To easy and simplify optimization process, instability and bad performance of system should be clarified. • Coverage : Can be adjusted by power settings (total, overhead), antenna tilting and orientation, hand-off area and so on. • Capacity : Trunk lines, Number of traffic channel and elements should be equipped with sufficient quantity • Parameters : Can be adjusted for the better coverage and capacity adjustment -4- Project Organization AGTINDO PM Network Optimizations PT.Telkomsel PM & Local Engineer Optimization Audit Support Management Co-work Vendor PM & Local Engineer -5- Optimization Process (1)  Preparation: BTS info. & Parameter Review o BTS position, type, output power, antenna info. o Frequency Status o Neighbor list • Site Survey & Simulation o Drive test & walk test o Rx Quality, Rx Level, Coverage plot o Handoff performance • Network Evaluation: Field measurement & analysis o Field measurement with Tems Investigations o Call event analysis - fail and dropped call - signal distribution (Rxqual, RxLev, SQI, etc) • Reduce bad quality area & Find Optimization method o Weak signal and Freq Interference YES END -6- START(Preparation) Survey & Simulation Network Evaluation Optimization Target & Method Decision Optimization Execution Optimization Evaluation NO Performance Objectives ? o Parameter error / Missing Neighbor, etc o Hardware trouble, etc • Execution, Evaluation and feedback Optimization Process (2) Field measurement & analysis - Coverage (bad area) analysis - Coverage overlay ratio - Call quality(drop and fail rate) NMS data analysis - System type / performance - System statistics analysis (C/D rate, Call fail, etc) Optimization Target - Coverage - Call quality Accomplishment & Evaluation - Issue based optimization - Evaluation for target goal Decision for Optimization method Coverage Improvement (Shadow & Bad area) Traffic Balancing (site / sector based) System performance improvement Trouble shooting Optimization result Feedback for engineering • System facilities check • System type change • Parameter error correction • Recommendation -7- Work Plan Ⅰ) Basic Data Analysis & CQT Ⅱ) Optimization (System, Parameter, etc) Ⅲ CQT & Report 1st week Setup 2nd ~ 3rd week 4th week ~ 11th week 12th week 1st CQT • Project setup • Kick off meeting • MS registration • Data analysis - BTS info. - Parameter - etc. Access Network Optimization • Field measurement • BTS Opt. - Site survey • CQT analysis - Fisical Tunning • CQT report • Action plan for opt. - Simulation - Cluster opt. - etc. • Parameter Opt. - System parameter - Access parameter - Handoff - Neighbor list adjust - etc 2nd CQT • 2nd CQT • Report & Presentation CQT Report & Opt. Action Plan Note 1) CQT: Call Quality Test 2) Opt.: Optimization -8- Report & Presentation Detail Items of Optimization • Basic items to be checked o BTS information and Hardware characteristics - Site Name and Type - Antenna type, height, directions and tilting degree, ( VSWR ) o Target service area of the base station and design capacity • Parameter settings to be checked o Neighbor list of each sector o Handoff parameter o Access parameter o Traffic channel parameter (Capacity) o Frequency / Channel Number o Power control parameter, etc • Basic call test o Mobile to mobile, mobile to fix lines, fix lines to mobile call test: origination & termination o Handoff test: in idle and dedicated mode -9- TS Basic Test(1): Basic Parameter Review Detail Items of Optimization  BTS Basic Test(2): Considerations • Database & fisical cheking o Operator input error, Database Parameter loading error for BTS. o Cable connection error between BTS and antenna (VSWR). • RF environment /Condition check o Using real call ( drive test & walk test with measurement test ). - This is used in most cell optimizations and field trials. Check for Interference, Speech quality, Signal level and Handover (and data com transfer / GPRS check). - 10 - Detail Items of Optimization  Cluster Test Center Cell • Goal o To verify the required basic function, performance and network stability through field test (classify the cluster) Neighbor Cell Cluster  Considerations o o o o o o o o Set the service area Find the coverage shadowing area / Indicate the shadowing area on the map Run field drive test / walk test Set the BTS transmit power and system parameters Optimize coverage Define the handoff area and optimize the handoff region: BTS power and antenna direction BSC parameter and ensure forward and reverse link balance Optimize FER/AMR - 11 - Detail Items of Optimization  Network Integration(1) • Optimization Target Area o Weak signal areas o Call drop areas o Access failure areas (call fail) Problem 1) Weak Signal Area Solution o Check Transmit power o Change antenna tilt o Antenna replacement - 12 - Detail Items of Optimization  Network Integration(2) • Optimization Target Area o Weak signal areas o Call drop areas o Access failure areas (call fail) Problem 2) Call droop areas Solution o Check the frequency - Adjust interferences - changes frequency or ant fisical tunning o Check the neighbor list - Missing neighbor list and - erroneous neighbor list order - 13 - Detail Items of Optimization  Network Integration(3) • Optimization Target Area o Weak signal areas o Call drop areas o Access failure areas (call fail) Problem 3) Access failure areas (call fail) Solution o Check the access parameter - capacity, frequency, signal power o Excessive IDLE handoff: coverage adjust o MSC, zone border: check registration - 14 - Detail Items of Optimization  Network Integration(4) • Hardware and Parameter Trouble shooting o Hardware trouble o Handoff and access parameter Problem 1) Hardware trouble Type Antenna VSWR Solution Phenomenon Coverage reduction High Tx_adj (above + 10dB) Optimization scheme Antenna replacement - 15 - Detail Items of Optimization  Network Integration(5) • Hardware and Parameter Trouble shooting o Hardware trouble o Handoff and access parameter trouble Problem 1) Handoff parameter trouble Type Poor IDLE handoff Poor H/O Call drop, etc Phenomenon Temporary NO SERVICE during H/O Solution Optimization scheme Neighbor list check Neighbor list and signal check 2) Access parameter trouble - Traffic channel parameters - Multi-path delay compensation - 16 -