@techreport{TD:72RQB4,
	att_abstract={{Multi-hop wireless meshed networks are being considered as backbones in metro broadband deployments. In such networks, wireless links need to offer low link-latencies, high goodput and low residual loss rates. Due to non-line-of-sight deployments involving fading/interference, such links experience high/bursty errors, especially at higher bit rates. Traditionally, wireless links use retransmissions (ARQ) and adaptive modulation/ coding to overcome loss. The price paid is reduced goodput (affecting bulk applications) and higher per-hop latencies (affecting latency-sensitive applications over multiple hops). Our paper starts with the design of a link-level hybrid ARQ scheme (LLHARQ) to achieve high goodput and low residual loss rate with limited ARQ attempts. While LL-HARQ performs well, it exports a small residual loss rate under high/bursty loss scenarios. Over multiple hops, this small residual loss accumulates and TCPSACK performance suffers. A transport protocol (LT-TCP) designed for loss tolerance achieves the best performance in combination with LL-HARQ, though TCP-SACK is sufficient if residual loss accumulation is under 5%. This suggests a division of reliability functions where link-layer attempts reliability with tight latency constraints, and transport layer support handles residual erasures. We develop insights for structuring FEC, and verify the goodput-loss rate-latency trade-offs and impact of bursty losses and multiple hops through simulations. }},
	att_authors={kr2812},
	att_categories={},
	att_copyright={{}},
	att_copyright_notice={{}},
	att_donotupload={},
	att_private={false},
	att_projects={},
	att_tags={TCP, ECN, Loss Tolerance, ARQ, Congestion Control, FEC},
	att_techdoc={true},
	att_techdoc_key={TD:72RQB4},
	att_url={http://web1.research.att.com:81/techdocs_downloads/TD:72RQB4_DS1_2010-08-18T17:03:39.132Z.pdf},
	author={Kadangode Ramakrishnan and Vijaynarayanan Subramanian and Shivkumar Kalyanaraman},
	institution={{}},
	month={April},
	title={{Balancing Loss-Tolerance between Link and Transport Layers in Multi-Hop Wireless Networks}},
	year=2007,
}