基于无线Mesh网络的分布式协调功能的研究

A Distributed Coordination Function Based on Mesh Networks

随着无线mesh网络的迅速发展和实时多媒体业务的日益增长,要求无线网络不仅能提供简单的连通性,还需要提供非常有效的QoS保证机制,针对这一问题,以时分多址/时分双工(TDMA/TDD)技术为基础,提出一种基于无线mesh网络的分布式协调功能,信道存取与数据传输发生在不同的时隙中,能够为端到端数据流公平的分配带宽,并且保证了实时服务传输的QoS.仿真及分析表明该协调功能可提高系统吞吐量并降低端到端延迟,有着更好的QoS性能.

With the development of mesh network and the application of the real-time multimedia traffic,there is a need not only to interconnect each other wirelessly,but also to support QoS.In this paper,we propose a Distributed Coordination Function based Mesh network,which is based on Time Division Multiplex Access／Time Division Duplex（TDMA／TDD） technology.The channel access and data transmission take place in different time slots.The MDCF is capable of distributing bandwidth fairly for end-to-end flows and performing multi-hop delivery of real-time services under specific QoS requirements.Theoretical analysis and analog simulation show that the MDCF improves throughputs and decreases end-to-end delay as compared with IEEE 802.11 EDCA and has good QoS performance.