认知无线电网络中QoS组播路由调度

摘要

The multicast information is usually transmitted through multiple intermediate nodes to reach the final destination node in multi-hop cognitive radio networks. There exist a lot of multicast routing protocols, while these based on traditional wireless networks are not suitable for cognitive radio networks. The question to be solved is in this paper: in multi-hop wireless networks, given a multicast routing with QoS requirements, how to create a multicast routing path and schedule node transmission so as to achieve the least bandwidth consumption in the transmission process. In this paper, a distributed multicast routing protocol is proposed to resolve the issue, It not only completes the establishment of the routing process, but also conquers the reasonable scheduling of nodes in the routing transfer process. Experimental results show that the transmission scheduling policy can effectively reduce network bandwidth consumption, and increase the success rate of the response of the multicast request.%在多跳认知无线电网络中,组播的信息通常要经由多个中间节点的转发才能到达最终的目的节点.现有的研究中已经有很多的组播路由协议,然而这些协议都是基于传统无线网络的,并不适合新型的认知无线电网络.本文解决的的问题是:在多跳无线网络中,给定一个具有QoS要求的组播请求,如何建立组播路由以及对路径节点进行传输调度,使得在满足QoS要求下整个传输过程的带宽消耗最小.本文提出了一个分布式的组播路由协议来解决该问题,该协议不仅实现了路由过程的建立,同时还完成了对节点传输过程的合理调度.实验结果证明本文的传输调度策略能有效地减少网络的带宽消耗,同时增加组播请求响应的成功率.