基于TDMA的分布式全双工链路调度算法研究

摘要

为了解决无线Ad hoc网络在负载较重时网络性能差等问题,提出了一种将TDMA(Time Division Media Access)与CCFD(Co-time Co-frequency Full Duplex)相结合的分布式全双工MAC(Media Access Control)协议.数据传输前节点首先在链路共存准则的基础上进行抑制检查,随后主链路按一定的优先级筛选二级链路并发起调度请求,调度所需的四次握手过程在业务时隙头部完成.本协议在不影响传统TDMA半双工通信的条件下,增加同一时隙中可以共存的链路数,改善网络的吞吐量和时延性能.%Traditional wireless Ad hoc networks have the problem of poor network performance under the circum-stances of high traffic load. To solve this problem,a distributed full duplex MAC protocol,which combines TDMA and CCFD together,is proposed. In this protocol,all nodes need to do suppression inspecting according to link co-existing schemes before data transmission begins.Then,primary TDMA links start searching secondary links according to the schedu-ling priority,and send out corresponding requests. The four times hand-shaking process of scheduling process is accom-plished within the head of the traffic slot.With no affect on the half-duplex transmissions of traditional TDMA networks,it can increase as many links coexisting with originla links in the same slot as possible.The simulation results show that this protocol actually improves throughput and time delay performances of the wireless Ad hoc networks.