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Accuracy Improvement of RTT Measurement on the Alternate Path in SCTP  

Kim, Ye-Na (단국대학교 컴퓨터학과 컴퓨터과학)
Park, Woo-Ram (단국대학교 컴퓨터학과 컴퓨터과학)
Kim, Jong-Hyuk (단국대학교 컴퓨터학과 컴퓨터과학)
Park, Tae-Keun (단국대학교 컴퓨터학부 멀티미디어공학)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.34, no.5B, 2009 , pp. 509-516 More about this Journal
Abstract
The Stream Control Transmission Protocol(SCTP) is a reliable transport layer protocol that provides several features. Multihoming is the one of the features and allows an association(SCTP's term for a connection) between two endpoints to use multiple paths. One of the paths, called a primary path, is used for initial data transmission and in the case of retransmission an alternate path is used. SCTP's current retransmission policy attempts to improve the chance of success by sending all retransmissions to an alternate destination address. However, SCTP's current retransmission policy has been shown to actually degrade performance in many circumstances. It is because that, due to Karn's algorithm, successful retransmissions on the alternate path cannot be used to update RTT(Round-Trip Time) estimation for the alternate path. In this paper we propose a scheme to avoid such performance degradation. We utilize 2bits which is not used in the flag field of DATA and SACK chunks to disambiguate original transmissions from retransmissions and to keep RTT and RTO(Retransmission Time-Out) values more accurate.
Keywords
SCTP; RTT; Multihoming; Transport Layer;
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