Groups of frequencies can be placed together into patterns of cells called cluster. A cluster is a group of cell in which all available frequencies have been used once and only once.
Since the same frequencies can be used in neighboring clusters, interference may become a problem. Therefore the frequency re-use distance must be kept as large as possible. However to maximize the frequency re-use distance should be kept as low as possible.
Since the same frequencies can be used in neighboring clusters, interference may become a problem. Therefore the frequency re-use distance must be kept as large as possible. However to maximize the frequency re-use distance should be kept as low as possible.
The re-use patterns recommended for GSM are the 4/12 and the 3/9 patterns. 4/12 means that there are four three-sector sites supporting twelve cells using twelve frequency groups.
No comments:
Post a Comment