Abstract:

To improve spectrum utility efficiency, a new strategy of dynamic spectrum access is developed in cognitive wireless network. This strategy, based on spectrum pool, has higher access efficiency than instant manners. The optimal capacity and update time of spectrum pool are all studied. It is found that there is quantitative mathematical relationship between optimal capacity and system efficiency. Different update strategies of spectrum pool in licensed and unlicensed frequency bands are also proposed. Simulation manifests that, under the assumed conditions, the update interval will vary within one hour in most cases.

Key words: cognitive radio, dynamic spectrum access, spectrum pool, capacity, update