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传统的TCP/IP协议主要是为有线网络环境而设计的,它的一些机制和算法难以很好适用于异构网络下的通信环境,对于定时器机制来讲尤其如此,为改善TCP在异构网络环境下的性能,文中提出了一种改进的TCP定时器机制,并对其在有线自身异构网络环境中垂直切换下的性能进行了仿真分析.结果表明,与原定时器机制相比,改进的机制解决了“假超时”现象,减少了切换过程中丢弃的数据包的数目.同时,改进的机制只在发送端作较小修改得到,实现简单.“,”TCP/IP is the prevalent, reliable transport control protocol. It is designed for wired network. However, when it is used in heterogeneous networks, TCP performance will degrade, especially for timing mechanism. In order to improve the TCP performance in heterogeneous networks, this paper proposes a modified TCP timing mechanism and its performance are investigated through simulations. Comparing with tradition timing mechanism, spurious timeout will be avoided; the retransmit probability will be decreased. In addition, the improved timing mechanism is obtained through a little modification at the sender side, so it can be easily developed.