Presentation Rf Optimization And Planning

RF

Optimization&

Planning

By:Mohammad Haris KhanRF Optimization EngineerMobilink – South

Nov 20 ’2009

• 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 KhanMobilink – RF Optimization 2

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 KhanMobilink – RF Optimization 3

RF Planning…

Mohammad Haris KhanMobilink – 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

RF Planning…

Mohammad Haris KhanMobilink – 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

RF Planning…

Mohammad Haris KhanMobilink – RF Optimization 6

Traffic Handling:

• Speech Codec's can be used to avoid initial congestion

• Expansion is the final Solution

RF Optimization

Mohammad Haris KhanMobilink – RF Optimization 7

Network Analysis

1. Tools are used to extract raw counters in statistical form (e.g.: Making Pivot Charts) to analyze the KPI’s.

2. Log Files analysis using TEMS (RF Tool)a) TEMS is an Ericsson proprietyb) Used for Air Interface Analysisc) Provide information of all three functional layers of GSM

3. Parameter Tuning to improve KPI’s as mentioned:a) CSSR (Call Setup Success Rate)b) DCR (Drop Call Rate)c) HoSR (Handover Success Rate)

RF Optimization…

Mohammad Haris KhanMobilink – RF Optimization 8

Traffic Balancing

1. There should be a Preferred Banda) 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 Handovera) Handovers can be InterCell or IntraCellb) Different Algo’s are defined for both types of HO’s

3. In Idle Mode, C2 is the method to distribute traffica) Forces the MS to camp over neighboring cellb) On the basis of perceived level of MS and CRO

RF Optimization…

Mohammad Haris KhanMobilink – RF Optimization 9

Congestion and its Remedy

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

RF Optimization…

Mohammad Haris KhanMobilink – RF Optimization 10

Major KPI’s

1. CSSR2. DCR3. HoSR4. Inc HoSR5. IASR6. Call Setup Blocking7. SD Blocking

and many more….!!!

RF

Optimization&

Planning

Presented To:Usman Institute of Technology

Presented By:Mohammad Haris KhanMobilink – RF Optimization

Dated:Friday, Nov 20 ’2009