基于CDMA无线信道的TCP 与UDP协议性能研究*

摘要

以吞吐率和有效因子为性能指标，分别就 i．i．d和相关无线信道模型对 TCP和 UDP协议进行了研究．虽然 UDP协议获得了TCP协议吞吐率性能的上界，但低时延、大拥塞控制窗口和信道相关性也有助于 TCP协议吞吐率逼近 UDP协议；对于有效因子性能，TCP协议性能更优．分析结果表明，拥塞控制窗口对于 TCP协议的有效因子和吞吐率2个性能指标的影响相互矛盾，因而窗口大小需要根据具体的应用进行取舍．%The performance of TCP and UDP over i.i.d and correlated wireless channel model is investiga-ted based on throughput and effective factor metrics.Although the throughput of TCP is upper bounded by UDP,the lower delay,larger maximum congestion window and correlated channel are also useful for TCP to approach UDP performance.As for effective factor,TCP is superior to UDP.Analysis and simulation re-sults show that the impact of congestion window on the effective factor and throughput performance of TCP is inversely,and the selection of maximum congestion window depends closely on the specific applica-tion.