多跳是Ad Hoc网络主要的特点,也是很多问题(如TCP流不公平、不稳定以及吞吐量下降等)产生的原因。文中基于NS2仿真平台研究了跳数及接入时间对TCP流公平性的影响,给出了不同TCP流的信道接入能力,深入分析了多跳TCP流公平性下降的原因,并在此基础上提出了改进公平性的建议。研究的结果表明,不同跳数的TCP流共存时,跳数较少的TCP流会占优甚至垄断信道。当跳数相同时,提前接入的TCP流会占优甚至垄断信道。 Multi-hop is a major feature of Ad Hoc networks and is responsible for many problems such as unfair TCP flows, instabilities, and throughput degradation. Based on the NS2 simulation platform, this paper studies the impact of hop count and access time on the fairness of TCP flows, gives the channel access capabilities of different TCP flows, and analyzes in depth the reasons for the decline of fairness of multi-hop TCP flows. Based on this, On the proposed improvement of fairness. The result of the research shows that when TCP flows with different hops coexist, TCP flows with fewer hops can dominate or even monopolize the channel. When the hop count is the same, the TCP flow accessed in advance can dominate or even monopolize the channel.