关键词: 自适应算法, 异构网络, 传输控制协议, 拥塞控制

Abstract: In the hybrid wired/wireless network, the traditional Transmission Control Protocol (TCP) versions in wired network simply ascribe packet loss to congestion, which causes unnecessary performance degradation. To solve this problem, a new adaptive control algorithm based on fuzzy theory was proposed. It selected new network status parameters, and used fuzzy loss differentiating method to make comprehensive evaluation out of network status, and it was based on feedback theory method, finally built an adaptive control model, i.e. getting the evaluation result set, then yielding the Transmission Performance Index (TPI) by summing up the result sets weighting elements, which entered into next evaluation cycle as one of the input factors and also adjusted the factors weights. The simulation results show this algorithm better reflects the real congestion status of hybrid network, has better network adaptability and performs better than current main TCP mechanisms. This algorithm, on the background of multi-parameters and using fuzzy methods, makes new explorations of hybrid network congestion and its adaptive control research.

Key words: adaptive algorithm, heterogeneous network, Transmission Control Protocol (TCP), congestion control