异构网络下TCP拥塞控制疏导方法的研究与仿真

发布时间：2018-06-14 12:32

本文选题：异构网络 + 拥塞控制　；参考：《计算机仿真》2016年09期

【摘要】：异构网络是由逻辑网构建而成,精确的TCP拥塞控制机制可以有效保障异构网络的稳定性,但采用传统算法进行异构网络的拥塞控制疏导时,难以辨别网络拥塞状态,存在异构网络拥塞控制疏导误差大的问题。为此,提出一种基于三重判决算法的异构网络下TCP拥塞控制疏导方法。首先定义异构网络传输时的丢包率(p LR)和RTT均值抖动积两个参数,利用模糊综合评价方法获取异构网络不同状态下的传输性能指标,计算出在异构网络不同状态下两个参数的隶属度函数,并利用三重判决算法对当前的异构网络状态进行判断,给定合理使用带宽且又不发生拥塞的当前缓存报文比特数取值范围,并设置慢启动门限对异构网络拥塞状态进行控制疏导。仿真结果表明,基于三重判决算法的异构网络下TCP拥塞控制疏导方法能够有效的保证异构网络的健壮性与稳定性。
[Abstract]:Heterogeneous network is constructed from logical network. Accurate TCP congestion control mechanism can effectively guarantee the stability of heterogeneous network, but it is difficult to distinguish the congestion state of heterogeneous network by using traditional algorithm. There is a problem of large grooming error in heterogeneous network congestion control. Therefore, a TCP congestion control grooming method based on triple decision algorithm is proposed for heterogeneous networks. Firstly, two parameters of packet loss rate (PLR) and RTT mean jitter product (RTT mean jitter product) are defined, and the transmission performance indexes under different states of heterogeneous network are obtained by fuzzy comprehensive evaluation method. The membership function of two parameters in different states of heterogeneous network is calculated, and the current heterogeneous network state is judged by triple decision algorithm. Given the range of the current buffer bit number with reasonable bandwidth and no congestion, and set the slow start threshold to control the congestion state of heterogeneous networks. Simulation results show that TCP congestion grooming method based on triple decision algorithm can effectively guarantee the robustness and stability of heterogeneous networks.
【作者单位】：郑州大学电气工程学院;
【分类号】：TP393.06

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