Improving TCP Performance over Wireless Links Using Link-Layer Retransmission and Explicit Loss Notification

摘要

In order to support the mobility of computers during communication, the transport control protocol (TCP) con-nections between fixed host and mobile host often traverse wired and wireless networks, and the recovery of the losses dueto wireless transmission error is much different from congestion control. This paper analyzes the interaction between TCPand link layer retransmission scheme when the correlated packet are losses handled, indicates that a higher value of themaximum number of successive link layer timeout retransmissions has an adverse effect on TCP ability to perform conges-tion control rapidly. To achieve a better TCP performance, the paper proposes a strategy combining link-layer selective-re-ject automatic repeat request (ARQ) with explicit loss notification mechanism, which can respond to congestion quicklywhile keeping wireless link more reliable, and make TCP react to the different packet losses more suitably.