Technical Training on RF Optimization

Optimization is to

Keep track of network

Improve quality of network

To provide best network quality using any available spectrum analyzer

Accessibility, Retainability, Mobility

The Radio Network Optimization (RNO) is to reasonably adjust the communication network planning and design as per certain criteria so as to enable the network operation more reliable and economical, improve the network service quality and resource utilization, which is of great importance to network carriers.

2G Optimization

1. Coverage Optimization

2. Call drop Optimization

3. Neighbor Optimization

4. Handover Optimization

Coverage

2G RX level

Good: Rx Lev > -85dbm

Radio Ok= -85dbm<Rx Lev<= -95dbm

Poor: Rx Lev < -95dbm

Coverage

Causes Poor Coverage

1. Poor coverage due to bad Rx Lev- Receive signal level < -95dbm

2. Poor Coverage due to Missing neighbors & handover failure 3. Faulty hardware. 4. Interference

1. Coverage Optimization Ways to improve coverage in a network if any of the following issue occurs

I. Poor coverage due to bad Rx Lev

Ways to improve poor coverage

Antenna tilt Antenna azimuth Antenna height TMA amplifier Antenna type Antenna location New site

II. Poor Coverage due to Missing neighbors Ways to resolve missing neighbors in other to improve coverage

Check neighbor list from BSS engineer Add missing neighbor cells.

III. Check hardware alarm, Loss of attenuation check – Feeders , connectors & Jumper

2. Call Drop

Causes of call drop

1. Poor coverage – Low signal strength

2. Handover failure

3. Missing Neighbors

4. Interference

5. Hardware Faulty

6. Signalling

2. Optimization of Call Drop

I. Call drop due to Poor coverage- Low signal strength

Ways to Optimize

Antenna tilt Antenna azimuth Antenna location Antenna height Antenna type Site location New site

II Call drop due to Handover failure

Ways to optimize handover failure

Unavailable time slots because of high traffic – Increase time slot Congestion – Increase Capacity Low signal strength and bad quality Check handover margin Hardware problem like TRX or time slot problem

II Call drop due to Missing neighbor

Ways to optimize handover problem

Check neighbor list from BSS engineer Add missing neighbor cells Remove unnecessary neighbor cells

III Call drop due to Interference.

Ways to Optimize

Avoid Co-channel- Same Frequency Avoid Adjust Channel – Adjacent frequency Check external interference

IV Check hardware Alarm, Radio failure and BTS failure

V. Signaling - Run a Trace in the affected area

3. Neighbor Optimization

I. Neighbor relation should be well define to avoid call drop

II. Check neighbor list from BSS engineer

III. Add missing neighbor cells IV Remove unnecessary neighbor cells.

4. Handover Optimization -

Check Handover margin