How Well Can TCP Infer Network State?


Show simple item record Barman, Dhiman en_US Matta, Ibrahim en_US 2011-10-20T04:12:50Z 2011-10-20T04:12:50Z 2003-05-16 en_US
dc.description.abstract The Transmission Control Protocol (TCP) has been the protocol of choice for many Internet applications requiring reliable connections. The design of TCP has been challenged by the extension of connections over wireless links. We ask a fundamental question: What is the basic predictive power of TCP of network state, including wireless error conditions? The goal is to improve or readily exploit this predictive power to enable TCP (or variants) to perform well in generalized network settings. To that end, we use Maximum Likelihood Ratio tests to evaluate TCP as a detector/estimator. We quantify how well network state can be estimated, given network response such as distributions of packet delays or TCP throughput that are conditioned on the type of packet loss. Using our model-based approach and extensive simulations, we demonstrate that congestion-induced losses and losses due to wireless transmission errors produce sufficiently different statistics upon which an efficient detector can be built; distributions of network loads can provide effective means for estimating packet loss type; and packet delay is a better signal of network state than short-term throughput. We demonstrate how estimation accuracy is influenced by different proportions of congestion versus wireless losses and penalties on incorrect estimation. en_US
dc.description.sponsorship National Science Foundation (ANI-0095988, EIA-0202067, ITR ANI-0205294); Sprint Labs; Motorola Labs en_US
dc.language.iso en_US en_US
dc.publisher Boston University Computer Science Department en_US
dc.relation.ispartofseries BUCS Technical Reports;BUCS-TR-2003-011 en_US
dc.subject TCP en_US
dc.subject Congestion control en_US
dc.subject Error control en_US
dc.subject Binary hypothesis testing en_US
dc.subject Maximum likelihood radio test en_US
dc.subject Gaussian distribution en_US
dc.subject Wireless links en_US
dc.subject Simulation en_US
dc.title How Well Can TCP Infer Network State? en_US
dc.type Technical Report en_US

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