Improving TCP Performance over Wireless with Data Link Layer ARQ (Network Protocols)

概要

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We propose a new TCP we named as "TCP Identification & Revivable Window (TCP-I&RW)" to improve TCP performance in wireless networks supporting data link layer automatic repeat request (ARQ) for link errors on wireless links. The TCP sender in TCP-I&RW places an identification tag decided by using random number for every data segment. Like conventional TCP protocols, if a segment loss is detected, it first infers a congestion, lowers the sending rate and retransmits with a different identification tag. The TCP sender figures out the actual cause of segment loss depending on identification reply in the acknowledgement corresponding to the retransmitted data. If the segment loss is not due to congestion, the TCP sender revives its transmission rate to the value prior to the retransmission. As such, erroneous detection of congestion is avoided. This ensures an improved throughput for TCP over wireless links supporting data link layer ARQ. Experiments show our proposed new scheme can achieve better performance than existing well established schemes in the cellular network and also in the satellite network. Also, TCP-I&RW incorporates a mechanism to nullify any attempt by aggressive TCP receivers hoping to occupy unfairly high shares of link bandwidth.
一般社団法人情報処理学会の論文
2004-04-15