TCP-LP: A Distributed Algorithm for Low Priority Data Transfer

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TCP-LP: A Distributed Algorithm for Low Priority Data Transfer (2003)

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by Aleksandar Kuzmanovic , Edward W. Knightly , Abstract Service

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@MISC{Kuzmanovic03tcp-lp:a,
    author = {Aleksandar Kuzmanovic and Edward W. Knightly and Abstract Service},
    title = {TCP-LP: A Distributed Algorithm for Low Priority Data Transfer},
    year = {2003}
}

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Abstract

Service prioritization among different traffic classes is an important goal for the future Internet. Conventional approaches to solving this problem consider the existing best-effort class as the low-priority class, and attempt to develop mechanisms that provide "better-than-best-effort" service. In this paper, we explore the opposite approach, and devise a new distributed algorithm to realize a low-priority service (as compared to the existing best effort) from the network endpoints. To this end, we develop TCP Low Priority (TCP-LP), a distributed algorithm whose goal is to utilize only the excess network bandwidth as compared to the "fair share" of bandwidth as targeted by TCP. The key mechanisms unique to TCP-LP congestion control are the use of one-way packet delays for congestion indications and a TCP-transparent congestion avoidance policy. Our simulation results show that: (1) TCP-LP is largely non-intrusive to TCP traffic; (2) both single and aggregate TCP-LP flows are able to successfully utilize excess network bandwidth; moreover, multiple TCP-LP flows share excess bandwidth fairly; (3) substantial amounts of excess bandwidth are available to low-priority class, even in the presence of "greedy" TCP flows; (4) the response times of web connections in the best-effort class decrease by up to 90% when long-lived bulk data transfers use TCP-LP rather than TCP.

Keyphrases

distributed algorithm low priority data transfer excess network bandwidth low-priority class excess bandwidth tcp-lp congestion control conventional approach tcp-transparent congestion avoidance policy better-than-best-effort service opposite approach aggregate tcp-lp flow greedy tcp important goal tcp traffic web connection different traffic class best-effort class response time tcp low priority substantial amount best-effort class decrease fair share congestion indication simulation result one-way packet delay network endpoint multiple tcp-lp flow share long-lived bulk data transfer future internet low-priority service key mechanism service prioritization

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