The actual frequency planning of certain areas is usually conducted with such areas divided into segments geographically, i.e., first divide a complex network into small networks. However, there should be some frequency carriers (when the frequency is enough) reserved at the boundary of the segments or the frequency carriers should be divided.
Such boundary should avoid hotspots or complex networking areas. Planning is usually started from the area with dense BTS. In the actual network, there is no guarantee that the frequencies of the same layer carrier can be completely planned with common modes such as 4*3 or 3*3, due to the irregular distribution of sites.
Principle for Frequency Planning
- There should be no co-channel frequency carriers in one BTS.
- The frequency separation between BCCH and TCH in the same cell should be not less than 400K.
- When frequency hopping is not used, the separation of TCH in the same cell should be not less than 400K.
- In non-1*3 reuse mode, co-channel should be avoided between the immediately neighbor BTS.
- Neighbor BTS should not have co-channels facing each other directly.
- Normally, with 1*3 reuse, the number of the hopping frequencies should be not less than twice of the number of frequency hopping TRX in the same cell.
- Pay close attention to co-channel reuse, avoiding the situation that the same BCCH has the same BSIC in adjacent area.