数据库辅助的分布式频谱共享
Database-assisted Distributed Spectrum Sharing
摘要：
根据FCC对白空间频谱接入的规定，白空间设备需要查询数据库以确定频谱可用性。本文研究了数据库辅助的分布式白空间接入点（AP）网络设计。首先将AP间的协作和非协作信道选择问题分别建模为系统吞吐量优化和非协作AP信道选择博弈，设计了分别达到系统最优点和纳什均衡的分布式AP信道选择算法。然后，我们提出了一个基于状态的游戏制定的分布式AP关联问题的二级用户考虑到成本的流动性。我们证明了基于状态的分布式AP关联博弈具有有限改进性质，并设计了一个分布式AP关联算法，该算法可以收敛到基于状态的纳什均衡。仿真结果表明，该算法对次用户动态退出和进入系统的扰动具有较强的鲁棒性。
英文摘要：
According to FCC's ruling for white-space spectrum access, white-space devices are required to query a database to determine the spectrum availability. In this paper, we study the database-assisted distributed white-space access point (AP) network design. We first model the cooperative and non-cooperative channel selection problems among the APs as the system-wide throughput optimization and non-cooperative AP channel selection games, respectively, and design distributed AP channel selection algorithms that achieve system optimal point and Nash equilibrium, respectively. We then propose a state-based game formulation for the distributed AP association problem of the secondary users by taking the cost of mobility into account. We show that the state-based distributed AP association game has the finite improvement property, and design a distributed AP association algorithm that can converge to a state-based Nash equilibrium. Numerical results show that the algorithm is robust to the perturbation by secondary users' dynamical leaving and entering the system.
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