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无线多跳网络(wireless multiple-hop networks,WMN)是近年来快速发展的网络技术,具有可靠性高、网络扩展性好等优势,但其通信环境多跳以及动态自组织的特点,给多媒体业务的应用带来了巨大的挑战。在本文中,提出了基于网络效用最大化(network utility maximization,NUM)的跨层联合优化算法,此算法是一种联合传输层、MAC层、物理层,利用凸优化方法,以网络效用最大化为目标的TCP速率控制和MAC接入竞争跨层联合优化算法,在保证多媒体业务端到端的QoS(quality of service)服务质量前提下,最大限度地提高网络的整体吞吐量。仿真结果表明,此算法可以根据本地网络信息,对系统进行全局优化,大大降低了系统的时延,提升了系统的吞吐量,同时能够满足应用的QoS要求。
Wireless multiple-hop networks (WMNs) are rapidly developing network technologies in recent years. They have the advantages of high reliability and good network scalability. However, their multi-hop wireless networks and dynamic self-organizing feature make multimedia services The application poses a huge challenge. In this paper, a cross-layer joint optimization algorithm based on network utility maximization (NUM) is proposed. This algorithm is a combined transport layer, MAC layer and physical layer. With the convex optimization method, the network utility maximization As the goal of TCP rate control and MAC access competition cross-layer joint optimization algorithm, to ensure multimedia services end to end QoS (quality of service) quality of service under the premise of maximizing the overall network throughput. The simulation results show that this algorithm can optimize the system globally according to the local network information, greatly reducing the system latency, improving system throughput, and meeting the QoS requirements of applications.