This paper presents preliminary quantitative results from data collected during runs of our multi-hop wireless ad hoc network testbed. The network successfully carried a composite workload including voice, bulk data, and real-time data. Careful analysis of recorded runs highlights radio propagation issues that network protocols will need to address in the future.

A number of different routing protocols proposed for use in multihop wireless ad hoc networks are based in whole or in part on what can be described as on-demand behavior. By on-demand behavior, we mean approaches based only on reaction to the offered traffic being handled by the routing protocol. In this paper, we analyze the use of on-demand behavior in such protocols, focusing on its effect on the routing protocol's forwarding latency, overhead cost, and route caching correctness, drawing examples from detailed simulation of the dynamic source routing (DSR) protocol. We study the protocol's behavior and the changes introduced by variations on some of the mechanisms that make up the protocol, examining which mechanisms have the greatest impact and exploring the tradeoffs that exist between them.

An ad hoc networkis a collwtion of wirelessmobile nodes dynamically forminga temporarynetworkwithouttheuse of anyexistingnetworkirrfrastructureor centralizedadministration.Dueto the limitedtransmissionrange of ~vlreless nenvorkinterfaces,multiplenetwork"hops"maybe neededfor onenodeto exchangedata ivithanotheracrox the network.In recentyears, a ttiery of nelvroutingprotocols~geted specificallyat this environment have been developed.butlittle pcrfomrartwinformationon mch protocol and no ralistic performancecomparisonbehvwrrthem ISavailable.~Is paper presentsthe results of a derailedpacket-levelsimulationcomparing fourmulti-hopwirelessad hoc networkroutingprotocolsthatcovera range of design choices: DSDV,TORA, DSR and AODV.\Vehave extended the /~r-2networksimulatorto accuratelymodelthe MACand physical-layer behaviorof the IEEE 802.1I wirelessLAN standard,includinga realistic wtrelesstransmissionchannelmodel, and present the resultsof simulations of net(vorksof 50 mobilenodes.This work was supported in