Balancing Loss Discrimination and Congestion Control in a Rate-Based Protocol

TitleBalancing Loss Discrimination and Congestion Control in a Rate-Based Protocol
Publication TypeThesis
Year of Publication2003
AuthorsGaonkar, S.
AdvisorKravets, R.
Academic DepartmentComputer Science
UniversityUniversity of Illinois at Urbana Champaign
AbstractThe stability of the Internet depends on the presence of well-behaved ows. While TCP forms the majority of the traffic over the Internet, the Internet user community is also dedicated to supporting mobile devices over wireless networks. However, TCP-like be- havior is not well suited to support applications over lossy wireless networks. Ideally, these applications require a protocol that adapts to network conditions with the ability to discriminate congestion-based and transmission-based losses. In this thesis, we present a rate-based transport protocol that is designed to support Internet-based communication for mobile nodes using infrastructure-based wireless net- works. We propose an end-to-end approach to loss discrimination based on network state estimation at the receiver. Discrimination is achieved by correlating short-term history of packet inter-arrival times with the loss. Simulations of our protocol prototype show that rate-based protocols can provide better correlation to network conditions than ACK-based protocols. We present an analytical model of XRTP's congestion control that enabled us to detect the reasons for XRTP's aggresive behavior. We provide exten- sions to XRTP's congestion control and by extensive evaluation through simulations, we demonstrate that our protocol is well-behaved over a wide range of scenarios.
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