认知无线电网络中控制信道预约的MAC协议

A Control Channel Reserving Based MAC Protocol for Cognitive Radio Networks

提出了一种多信道自适应媒体接入控制(MAC)协议,该协议引入了竞争控制信道和预留控制信道.认知用户在接入过程中,首先在竞争控制信道上预约、预留控制信道子帧,然后再通过预留控制信道基于请求带宽预约数据信道,同时认知用户通过维护信道状态表来分配和回收信道资源.仿真结果表明,该协议可有效地调度多用户多信道接入,具有良好的可扩展性和端到端吞吐性能,可大大降低冲突和拥塞概率及端到端时延.

A multi-channel adaptive media access control （ MAC） protocol based on the concepts of competing control channel （ CCC） and reserving control channel （ RCC） is presented. In order to access wireless channels,cognitive users reserve the sub-frame of RCC through CCC that obligates the access opportunities for different traffic. The users apply the required bandwidth using RCC based data channel. The channel is distributed and recycled by updating a channel state table. Simulations show that the proposed protocol can effectively schedule the accessing of users and exhibit good scalability. It significantly reduces the probability of collision and congestion,thereby improves the end-to-end delay and network throughput.