Lin Cui , Choong Seon Hong

The KIPS Transactions:PartC, Vol. 12, No. 7, pp. 1039-1046, Dec. 2005
10.3745/KIPSTC.2005.12.7.1039,   PDF Download:

Abstract

TCP SACK is the unique mechnism to reflect the situation of sink´s sequence space, some TCP variants and proposals can perform in conjunction with SACK mechnism for achieving optimal performance. By definition of RFC 2018, however, each contiguous block of data queued at the data receiver is defined in the SACK option by two 32-bit unsigned integers in network byte order. Since TCP Options Field has a 40 Byte Maximum length, when error bursts occur, we note that the available option space may not be sufficient to report all blocks present in the receiver´s queue and lead to unnecessarly force the TCP sender to retransmit packets that have actually been received by TCP sink. For overcoming this restriction, in this thesis a new solution names "one-byte offset based SACK mechnism: us designed to further improve the performance of TCP SACK and prevent those unwanted retransmissions. The results of both theory analysis and simulation also show that his proposed scheme operates simply and more effectively than the other existing schemes by means of the least bytes and mosy robust mechnism to the high packet error rates often seen in networks environment.

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