An advanced dynamic spectrum allocation algorithm in cognitive radio based on priority of nodes

The proposal of cognitive radio can fundamentally solve the problem of the insufficiency of spectrum. Among them, the dynamic spectrum allocation is the key to decide how to use the limited spectrum efficiently. However, the existing graph colouring algorithm does not consider the priority of user nodes, leading to the delay of spectrum allocation. In this article, an advanced dynamic spectrum allocation algorithm based on the priority of user nodes will be put forward. During the spectrum allocation, the priority of channel and the priority of user nodes will be considered, using the thoughts of best-available-multiple-allocate in order to meet the requirements of the users´ bit error rate and the need of delay. The simulation analysis shows that the advanced algorithm based on the priority of nodes can not only satisfy the customers´ needs, providing higher allocation efficiency, but also reflect the fairness of spectrum allocation better.