Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
Channel management in IEEE 802.22 WRAN systems
IEEE Communications Magazine
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IEEE 802.22 is the first protocol that proposes the use of TV whitespaces [1] for WRAN. It proposes a typical cellular network. However, it also has limited performance. If it were to support direct communication between CPEs in a cell, not only the network capacity could be enhanced, but also the channel usage could be increased. Therefore, we propose a peer to peer communication method in IEEE 802.22 networks and three collision area based channel allocation algorithms. The first algorithm aims to maximize the channel reuse the second one employs an algorithm for fair channel allocation. The third algorithm finds a trade-off between channel reuse and fairness. In all three algorithms, multiple channels can be allocated in one time slot to different CPEs, and same channel can also be allocated more than once in one time slot via power control techniques without causing interference or collision. Maximizing network performance in every time slot may cause unfairness in allocation. Therefore, we proposed to consider fairness in channel allocation. This leads to a trade-off between network performance and fairness. The simulation results show that our algorithms can improve network performance significantly, compared to standard IEEE 802.22 networks.