The Study Of Link Layer Solution Mechanism Over Wireless TCP

Transmission Control Protocol (TCP) is a reliable, robust and end-to-end transmission protocol designed for Internet. TCP can work well on the traditional wired networks where packet loss rate is low and packet losses are mainly caused by network congestion. When running on wired/wireless heterogeneous networks, TCP meets a huge challenge.After synthesizing many kinds of the TCP enhancement schemes and analyzing several of them carefully, a new link layer solution mechanism is proposed, named Clustered-loss Retransmission Protocol (CLRP). In this protocol, a detection mechanism to multiple wireless losses is presented firstly, called Selective Negative Acknowledge (SNACK) mechanism. Combined with it, CLRP consists of two protocol components, which are SN-CLRP deployed on base stations and SN-TCP deployed on mobile hosts, mainly performing the functions of detection and retransmission for wireless packet losses. Finally, according to the principle analyses and simulation results. CLRP can effectively improve the TCP transmission performance over wireless networks, particularly to the networks with high packet loss rate and strong bursty losses.