基于多跳无线网络的TCP速率控制方法设计

TCP Rate Control Method Design Based on Multiple-hop Wireless Network

针对多跳无线网络的不稳定性、时延性、带宽有限性以及动态性等典型特征,本文提出一种基于跨层优化设计的保证通信业务QoS要求的TCP速率控制方法。该方法的核心思想是按照无线通信业务通信延时的基本标准,利用基于价格优势的TCP速率控制和数据链路层竞争联合跨层控制算法,最大程度地降低由于通信延迟和TCP拥塞引起的丢包率。此优化控制方法属于跨层联合优化方案的范畴,竞争接入算法和功率控制算法参数根据"拥塞价格"因子进行动态调整,在保证满足通信的QoS要求下,提升无线网络的整体吞吐量。Matlab仿真实验表明,本文设计的TCP速率控制方法能够在一定程度上提升无线网络的吞吐量,降低网络通信延时。

To deal with the problems such as unreliability, delay, bandwidth fluctuation, and dynamics of multi- ple-hop wireless network, this paper proposes a TCP rate control method based on cross layer optimization strategy with QoS guarantee multimedia business. The main idea is based on multimedia business end-to-end delay constraint, making the combination of TCP rate control algorithm based on price advantage and MAC layer competition control al- gorithm. And then minimizes the delay and packet loss rate caused by network congestion to achieve system perform- ance improvement. This method is a kind of cross layer resources allocation. Competition access and power control al- gorithm make dynamic adjustment based on ＂congestion pricing＂ to maximize the overall throughput of wireless network under the Qos demand which guarantees the communicate. Matlab simulation results show that the designed method of TCP rate control can improve wireless network throughput, and reduce the network communication delays.