RFOptimizationand Planning

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By: Mohammad Haris Khan RF Optimization Engineer Mobilink – South Nov 20 ’2009

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What is RF Planning? Coverage and Capacity. Calibration of Planning Tools. Frequency Planning. What is RF Optimization? Network Analysis. Parameter Tuning. Maintain and Improve KPI’s. Mohammad Haris Khan Mobilink – RF Optimization 2

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RF Planning GSM Bands: GSM – 900 (P-GSM) 890 – 915 MHz (Uplink) 935 – 960 MHz (Downlink) 124 : Number of Available ARFCNs. GSM – 1800 (DCS) 1710 – 1785 MHz (Uplink) 1805 – 1880 MHz (Downlink) 374 : Number of Available ARFCNs. Mohammad Haris Khan Mobilink – RF Optimization 3

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RF Planning… Mohammad Haris Khan Mobilink – RF Optimization 4 Types of Sites: Single Site GSM – 900 / GSM – 1800 (DCS) Single BCCH Dual Band / BCCH Site GSM – 900 + GSM – 1800 Dual BCCH Concentric Site GSM – 900 & GSM – 1800 Single BCCH

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RF Planning… Mohammad Haris Khan Mobilink – RF Optimization 5 Coverage and Capacity: Coverage: Depends upon the area (e.g. Urban, Rural, Hilly, Highway) Frequency is inversely proportional to the Wave Length Which type of site should be proposed for highway (Considering the long area but very low traffic) ??? Capacity: Always comes with coverage area Capacity must be known properly before deciding for Coverage No. of radios must be finalized as per Capacity of the area

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RF Planning… Mohammad Haris Khan Mobilink – RF Optimization 6 Traffic Handling: Speech Codec's can be used to avoid initial congestion Expansion is the final Solution

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RF Optimization Mohammad Haris Khan Mobilink – RF Optimization 7 Network Analysis Tools are used to extract raw counters in statistical form (e.g.: Making Pivot Charts) to analyze the KPI’s. Log Files analysis using TEMS (RF Tool) TEMS is an Ericsson propriety Used for Air Interface Analysis Provide information of all three functional layers of GSM Parameter Tuning to improve KPI’s as mentioned: CSSR (Call Setup Success Rate) DCR (Drop Call Rate) HoSR (Handover Success Rate)

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RF Optimization… Mohammad Haris Khan Mobilink – RF Optimization 8 Traffic Balancing There should be a Preferred Band Preferred Band is usually DCS (GSM – 1800) DCS is comparatively cleaner (due to less no. of losses) No Massive Overlapping as in GSM – 900 Band Another appropriate method for traffic balancing is Handover Handovers can be InterCell or IntraCell Different Algo’s are defined for both types of HO’s In Idle Mode, C2 is the method to distribute traffic Forces the MS to camp over neighboring cell On the basis of perceived level of MS and CRO

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RF Optimization… Mohammad Haris Khan Mobilink – RF Optimization 9 Congestion and its Remedy Congestion usually occurs when there are less no. of channels available than offered traffic (in Erlang) How to Avoid Congestion??? General Capture HO ( Level Dependent ) Traffic HO ( Level and Availability dependent ) Directed Retry HO ( SD HO ) Another way to relief Congestion is QUEING Final possible solution is Expansion

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RF Optimization… Mohammad Haris Khan Mobilink – RF Optimization 10 Major KPI’s CSSR DCR HoSR Inc HoSR IASR Call Setup Blocking SD Blocking and many more….!!!

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Queries Please

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R F Optimization & Planning Presented To: Usman Institute of Technology Presented By: Mohammad Haris Khan Mobilink – RF Optimization Dated: Friday, Nov 20 ’2009 Thank You!