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R

F

Optimization&

Planning

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 KPIs.

Mohammad Haris Khan

Mobilink RF Optimization 2

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RF PlanningGSM Bands:

1.GSM 900 (P-GSM)a) 890 915 MHz (Uplink)

b) 935 960 MHz (Downlink)

c) 124 : Number of Available ARFCNs.

2.GSM 1800 (DCS)a) 1710 1785 MHz (Uplink)b) 1805 1880 MHz (Downlink)

c) 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:

1. Single Site

a) GSM 900 / GSM 1800 (DCS)

b) Single BCCH

2. Dual Band / BCCH Site

a) GSM 900 + GSM 1800

b) Dual BCCH

3. Concentric Site

a) GSM 900 & GSM 1800

b) 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. ofradios 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

1. Tools are used to extract raw counters in

statistical form (e.g.: Making Pivot Charts) to analyze the KPIs.

2. Log Files analysis using TEMS (RF Tool)

a) TEMS is an Ericsson propriety

b) Used for Air Interface Analysis

c) Provide information of all three functional layers of GSM

3. ParameterTuning to improve KPIs as mentioned:a) CSSR (Call Setup Success Rate)

b) DCR (Drop Call Rate)

c) HoSR (HandoverSuccess Rate)

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RF Optimization

Mohammad Haris Khan

Mobilink RF Optimization 8

Traffic Balancing

1. There should be a Preferred Band

a) Preferred Band is usually DCS (GSM 1800)

b) DCS is comparatively cleaner (due to less no. of losses)c) No Massive Overlapping as in GSM 900 Band

2. Another appropriate method for traffic balancing is Handover

a) Handovers can be InterCell or IntraCell

b) Different Algos are defined for both types of HOs

3. In Idle Mode, C2 is the method to distribute traffic

a) Forces the MS to camp over neighboring cell

b) 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

1. Congestion usually occurs when there are less no. of channels available

than offered traffic (in Erlang)

2. How to Avoid Congestion???

a) General Capture HO ( Level Dependent )

b) Traffic HO ( Level and Availability dependent )

c) Directed Retry HO ( SD HO )

3. Another way to relief Congestion is QUEING

4. Final possible solution is Expansion

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RF Optimization

Mohammad Haris Khan

Mobilink RF Optimization 10

Major KPIs

1. CSSR

2. DCR

3. HoSR4. Inc HoSR

5. IASR

6. Call Setup Blocking

7. SD Blocking

and many more.!!!

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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