In this paper we study the energy cost (protocol processing and communication cost) and goodput of two different flavors of TCP in ad hoc networks. We implemented a testbed and measured the actual energy cost as well as goodput of running TCP-SACK in ad hoc network scenarios. We also implemented Explicit Link Failure Notification (ELFN)[1] and Explicit Congestion Notification (ECN)[2] in Newreno and measured its performance. We see that the use of ECN & ELFN does yield higher goodput in most cases with a corresponding lower total energy cost. We see an energy savings of between 20% and 500% depending on the network conditions.
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