The popular optimization methods to improve coverage

The popular optimization methods to improve coverage
1. Adjust antenna azimuth, down tilt, height;
2. Replace antenna type and adjust antenna gain, beam width, adopt electric-down tilt antenna;
3. Adjust cell power;
4. Clear out outside interference;
5. Add new BTS or radio-remote station or repeater;
6. Add indoor distribution system;
7. Move BTS and adjust network topology structure;

DT Test Analyzing Application in Call Failure
MS calling principle
MS call includes out-going call and in-going call; they are all included to “origination procedure”.
One subscriber dials another subscriber; it is called as one origination. If the connection between two subscribers can not be setup in defined time, it is called as “one origination failure”.
For example: MS voice out-going call. Its call procedure is shown as Fig

The signal procedure is like the following:

During the call procedures, if any one step is not finished, the call will be failed.

Integrated Analyzing
Call successful ratio is used for network integrated evaluation. Increase successful ratio will increase subscribers’ confidence for network and network equipments utilizing ratio. Call successful ratio includes origination successful ratio and termination successful ratio.

For the large-scale commercial network, call successful ratio observed from OMC is more accurate; for the network without load or light load, DT test can be used to acquire call successful ratio, adopt sequence call test in DT test.

Call successful ratio= (total call successful number/total call attempt number)*100%
Commonly for urban area, 98% is a good performance index; for rural area this index should be a little low.

Attention:
The concrete index for call successful ratio is finally decided by operator’s requirement.