Alliance-based Opportunistic Spectrum Access for Cognitive Radio Networks
Zhen Yang · Journal of Nanjing University of Posts and Telecommunications · 2010
In cognitive radio networks,collision occurs when the secondary user fails to detect the presence of primary users and may access the channel.The more is the number of the secondary users in contention of the same channel,the higher is the collision probability.An alliance-based access method is proposed to rationally allocate the number of secondary users in contention of each channelso as to reduce the conflicts between primary users and secondary users.The mechanisms of OSA-MAC and ALLY-MAC were compared by simulation.The results show the improvement brought by ALLY-MAC in terms of conflict decrease and system throughput increase.