Dynamic Channel Switching based on Rank Accounting in IEEE 802.22 WRAN System with Fast Channel Switching Technology

In this paper, we propose dynamic channel switching based on rank accounting so that WRAN systems can utilize channels effectively without strict coordination. In the proposed method, a base station in each WRAN cell has a ranking database where each rank denotes the usage frequency of channels. When the rank of a channel is high (low), the channel is (is not) used frequently for data transmission. Based on the ranking database, each WRAN cell utilizes an unused channel whose rank is high. Moreover, the proposed method utilizes the number of failures for channel switching in order to avoid the collision. By using the proposed method, it is expected that WRAN cells can perform channel switching with a small number of channels effectively. We evaluate the performance of the proposed method by simulation, and we investigate the effectiveness of the proposed method. Numerical examples show that the failure probability of channel switching for the proposed method is almost zero. In addition, it is shown that the proposed method uses a small number of channels effectively.