拥塞控制是确保Internet稳定的关键因素,也是各种管理控制机制和应用的基础。网络产生拥塞的根本原因在于用户给网络提供的负载大于网络资源容量和处理能力,结果导致数据包时延增加,丢弃概率增大,上层应用系统性能下降等。重点分析TCP传输机制和拥塞控制机制,对无线局域网网络性能的调控具有一定的指导意义。 Congestion control is a key factor in ensuring the stability of the Internet and is the basis for various management control mechanisms and applications. The root cause of network congestion is that the load provided by the user to the network is greater than the capacity and processing power of the network resources. As a result, data packet delay increases, discard probability increases, and performance of the upper application system decreases. Focusing on TCP transmission mechanism and congestion control mechanism has some guiding significance for the regulation of wireless LAN network performance.