关键词: 认知无线电网络, CRTCA, 信道分配, 信道占用时间, ITCA, 吞吐量, 冲突率

Abstract:

The robust network topology,the interference to primary users and the interference among secondary users are important indicators to measure network performance in channel assignment of cognitive radio networks.By assuming that the channel occupancy time is negatively exponentially distributed,an indicator which makes a tradeoff between the interference to primary users and the interference among secondary users is given.Then,we propose an improved topology control algorithm based on the channel selection criteria of central robust topology algorithm.Simulation results show that the ITCA which makes a tradeoff between the interference to primary users and the interference among secondary users is bigger in throughput and lower in collision rate than CRTCA.

Key words: cognitive radio networks;CRTCA;channel assignment;channel occupancy time;ITCA;throughput;collision rate