Performance analysis of TCP NewReno over a cellular last-mile: buffer and channel losses

Manoj Panda, Hai L. Vu, Michel Mandjes, Shiva Raj Pokhrel

Research output: Contribution to journalArticleResearchpeer-review

16 Citations (Scopus)


TCP NewReno is one of the most widely deployed TCP versions in today's Internet. However, a full understanding of the complex inter-dependencies between the losses due to wireless channel errors and those due to buffer overflows, and their (joint) impact on TCP NewReno's congestion control algorithm in wireless and wired-cum-wireless networks is still lacking. In this paper, we develop a comprehensive analytical model for, and study the performance of, TCP NewReno with a cellular last-mile access, taking into account both types of losses. We assume a frame-level Markovian loss model, and build a model that features the system's basic controllable parameters (such as the number of retransmissions and the buffer size), so as to study how they (jointly) affect the TCP-level throughput. We model certain finer aspects, e.g., correlations in wireless and buffer losses and their cross-correlation. We provide a summary of numerical results highlighting several non-trivial findings. In particular, we demonstrate that there exist optimal (i.e., TCP throughput maximizing) pairs of the number of retransmissions and the buffer size.
Original languageEnglish
Article number6909041
Pages (from-to)1629-1643
Number of pages15
JournalIEEE Transactions on Mobile Computing
Issue number8
Publication statusPublished - 1 Aug 2015
Externally publishedYes


  • TCP NewReno
  • Finite state Markov channel model
  • Fixed-point analysis
  • Slowly varying channel
  • Relative time-scale

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