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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。
Aiming at the typical characteristics of multi-hop wireless networks, such as instability, delay, limited bandwidth and dynamic characteristics, this paper proposes a TCP rate control method based on cross-layer optimization to ensure QoS requirements of communication services. The core idea of this method is to use the TCP rate control based on price advantage and the data link layer competition in combination with the cross-layer control algorithm according to the basic standard of communication delay of wireless communication service, to minimize the loss due to communication delay and TCP congestion Packet rate. The optimization control method belongs to the category of cross-layer joint optimization scheme. The parameters of the competition access algorithm and the power control algorithm are dynamically adjusted according to the “congestion price” factor, so as to improve the overall throughput of the wireless network . Matlab simulation results show that the TCP rate control method designed in this paper can improve the throughput of wireless network to a certain extent and reduce the delay of network communication.