Abstract:

In distributed multi-user opportunistic spectrum access (OSA) environment, user-synchronization problem is the vital reason for network throughput deteriorating. To resolve this problem, a changeable-domain based sensing policy is proposed. By adopting randomized sensing policy it can weaken user-synchronization. When changing the number of channels which are available for randomized access (i.e. the width of the random domain), the proposed policy can achieve a tradeoff between optimal myopic sensing and user-synchronization avoidance. Simulations show that the policy can achieve higher network throughput compared to the randomized sensing policy over the whole channels.

Key words: opportunistic spectrum access, distributed, user-synchronization, changeable random domain