Analysis Of Link-Level Hybrid FEC/ARQ-SR For Wireless Links and Long-Lived TCP traffic

Chadi Barakat 1 Alaeddine Al Fawal 1
1 PLANETE - Protocols and applications for the Internet
Inria Grenoble - Rhône-Alpes, CRISAM - Inria Sophia Antipolis - Méditerranée
Abstract : Since the TCP protocol uses the loss of packets as an indication of network congestion, its performance degrades over wireless links, which are characteri- zed by a high bit error rate. Different solutions have been proposed to improve the performance of TCP over wireless links, the most promising one being the use of a hybrid model at the link-level combining FEC, ARQ-SR (Automatic Repeat Request with Selective Repeat), and an in-order delivery of packets to IP. The drawback of FEC is that it consumes some extra bandwidth to transmit the redundant information. ARQ-SR does not consume much bandwidth, its drawback is that it increases the round-trip time (RTT), which may deteriorate the performance of TCP, if not done appropriately. We study in this paper the performance of TCP over a wireless link implementin- g hybrid FEC/ARQ-SQ. The study is done by simulating and modeling long-lived TCP transfers over wireless links showing Bernoulli errors. We are motivated by how to tune link-level error recovery e.g. amount of FEC, persistency of ARQ, so as to maximize the performance of TCP. We provide results for different physical characteristics of the wireless link (delay, error rate) and for different traffic loads (number of TCP connections).
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Chadi Barakat, Alaeddine Al Fawal. Analysis Of Link-Level Hybrid FEC/ARQ-SR For Wireless Links and Long-Lived TCP traffic. [Research Report] RR-4752, INRIA. 2003. ⟨inria-00071835⟩

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