Energy Consumption of TCP in Ad Hoc Networks

In this paper we study the energy cost (protocol processing and communication cost) and goodput of di erent avors of TCP (Transmission Control Protocol) in ad hoc networks. We implemented a testbed and measured the actual energy cost as well as goodput of running TCP Reno, Newreno, SACK (Selective ACKnowledgement) and a version that combines Explicit Link Failure Noti cation (ELFN) [7] and Explicit Congestion Noti cation (ECN) [5] in Newreno. 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. Categories & Subject Descriptors C.4 [Performance of Systems]: Measurement Techniques; D.4.4 [Operating Systems]: Communications Management.