New project 18
- 1. 1 Introduction • What is Optimization ? - Activity of achieving and maintaining the required quality as designed • Why Optimization ? - Deviations between plan and reality
- 2. 2 What is Optimization ? Design PlanningOptimization Implementation
- 3. 3 Why Optimization ? • Inaccuracy of radio planning - Statistical variations in the path loss characteristics - Finite terrain database resolution • Implementation - Antenna radiation pattern and effective radiated power - Antenna pattern distortion • Environment - Seasonal environmental changes, e.g trees, leaves - Environmental changes such as new highways, new buildings
- 4. 4 Optimization Phases Initial Optimization Primary Optimization Maintenance Optimization c c •Site Audit •Proper Parameters use •Verify Neighbors list •Reviewing Frequency Plan •Verify existing coverage, site design objectives •Analysis & Identification of Problem areas/cells •from PMS & drive test statistics, •customer complaints •Prioritization of problems •Identify Solution and Implement •Retest the problem areas •Consistency Check of the OMC database •Fine-tuning of parameters •On going process, weekly optimization • Database maintenance and consistency audits
- 5. A. Visit BTS site & Collect the following info : 1. Height of Antenna 2. Antenna Azimuth – Orientation 3. Antenna tilt 4. Checking of RF connectorization 5. Verification of serving area by existing Antenna orientations 6. VSWR & TX Power of DRX B. Data from OMC-R : 7. BCCH frequency 8. Hopping Frequency 9. MAIO & HSN 10. Neighbour List Pre Requirements for Drive Test :
- 6. DRIVE TEST : 1. Tool may be setup for two mobiles – One for Continuous call and another for short calls (2 minutes). 2. In the route map following are to be enabled for Analysis. 1. Rx Level 2. RX Quality 3. Survey Markers (like H/O, DCR & H/O flr symbols) 4. Cell site Database. 3. Call statistics for the Calls in the Point -1 to be enabled. 4. Conduct the Drive Test – covering all sectors by observing the following parameters. 1. Rx Level 2. Rx Quality 3. Interference on BCCH & Hopping Frequencies. 4. Handovers & Drop Calls 5. Observe whether the nearest sector is serving or not.
- 7. Drive testing INPUTS TOOLS Output Alarms and events Analysis from OMC Customer complaint Analysis Drive test kit(TEMS) and optimization tool( PLANET) OMC-R or Traffic Analysis Tool(Metrica) OMC-R Customer Care Centre Database Database Parameters Antenna downtilt Azimuth changes Antenna type changes Database parameters changes Handover algorithm tunings Radio parameters tuning Quality Of Service Metrics RF Design Parameters Optimization Inputs ,Outputs and Tools
- 8. Analysis of Drive Test Results : Observation Cause Solution Coverage Poor (Low RX Level) 1. Antenna Orientations & Tilt Physical check of Orientations & Tilt. 2. High VSWR Value Check RF connectors & RF cables 3. TX Power Check the DRX power & connectors Poor RX Quality 1. Intereference Check the BCCH & MAIO frequencies Reduction of Antenna height, Orientation & Tilt 2. Low Rx level Check the DRX power & connectors 3. H/O failure Check the neighbour list & definitions Check the neghbour parameters 4. Assignment Failure Ratio Check DRX & Check VSWR & RF cable connectivity 5. Hard Ware Problem DRX problem
- 9. Analysis of Drive Test Results : Observation Cause Solution Handover Failure 1. Not defining proper neighbours Defining the proper neighbours. 2. Improper Neighbour Parameter values Check the neghbour parameters 3. Due to TCH congn. Augmentation of DRIs Call Drop 1. Not defining proper neighbours Defining the proper neighbours. 2. Low Rx level Check the DRX power & connectors 3. Intereference Check the BCCH & MAIO frequencies Reduction of Antenna height, Orientation & Tilt 4. H/O failure Check the neighbour list & definitions Check the neghbour parameters 5. Assignment Failure Ratio Check DRX & Check VSWR & RF cable connectivity 6. Hard Ware Problem DRX problem
- 10. TRAI Bench Marks for QOS PARAMETERS 1. Call Setup Success Rate > 98% 2. Drop Call Rate < 3% 3. TCH Blocking Rate < 2% 4. SDCCH Blocking Rate < 1% 5. Rx.Quality(0-5) > 95% 6. Handover Success Rate > 98% 7. Co Channel Interference > 98%