Lost retransmission detection for TCP SACK

Beomjoon Kim, Dongmin Kim, Jaiyong Lee

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


There have been a lot of works to avoid retransmission timeout (RTO) of transmission control protocol (TCP) that takes place in an unnecessary situation. However, most current TCP implementations, even if selective acknowledgment (SACK) option is used, do not have a mechanism to detect a lost retransmission and avoid subsequent RTO. In this letter, we propose a simple modification that enables a TCP sender using SACK option to detect a lost retransmission, which is called TCP SACK+ in simple. We use a stochastic model to evaluate the performance of TCP SACK+. Numerical results evaluated by simulations show that TCP SACK+ improves the loss recovery of TCP SACK significantly in presence of random losses.

Original languageEnglish
Pages (from-to)600-602
Number of pages3
JournalIEEE Communications Letters
Issue number9
Publication statusPublished - 2004 Sept

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Computer Science Applications
  • Electrical and Electronic Engineering


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