Strategies forContext-Adaptive Message Dissemination in VehicularAd Hoc Networks

In future deployments ofVehicular AdhocNet-that absorb thelimited network resources andpossibly prevent works(VANETs) safety-related applications suchaslocal dangerhighly relevant datafrombeing transmitted. Simple dissem- warning (LDW)will usebroadcast-based communication schemesination limitation strategies suchasGeocast (2)workas totransmit information toothervehicles within thenetwork. Theunlimited flooding ofa message throughout thewholea first approach toreducechannel congestion, butdonot network however, isneither feasible norintended. Thehighaccount fortheindividual nodes' interest norarethey ableto resulting traffic loadwouldcongest theshared wireless mediumoptimally leverage network resources inbothsparse anddense andprevent other, potentially highly relevant andtime-critical networks. Otherapproaches ofintelligent restrictions toa messages fromgetting access tothemedium. Existing strategies mereflooding aspresented in(3)-(5) helpreducing redundant tolimitredundant packetretransmissions managetomake retransmissions andmaking abroadcast-based propagation of broadcast-based datapacket dissemination moreefficient and reliable. However, theydonottakeinto account theindividual messages morereliable andefficient. However, theycannot network's nodesinterest ininformation. Infact, thestatic ensure that information istransported towhereitisneeded mechanisms proposed arenotadequate toleverage thelimited withanassmall aspossible latency while optimally leveraging network resources asefficiently aspossible invarying networktheavailable network resources. conditions andtotransport information towhereitisneeded asfastaspossible. Therefore, we proposean altruistic com- munication scheme whichdifferentiates datatraffic accordingContext isanimportant issue forwarning applications in tothebenefit itislikely toprovide topotential recipients. A VANETs:A messagecontaining atraffic congestion waring systemforcalculating andleveraging messagebenefit andtwo different nodearchitectures arepresented. Withthehelpofa forthecity center will mostlikely beofnouseforthedriver comprehensive simulation environment, theperformance ofour ofavehicle onthehighway around thecity. However, the concept isanalyzed. Comparative simulative studies showthatdriver ofavehicle onthesamehighway entering thecity might animprovement ofthebenefit provided toalltheparticipants in beinterested inthemessage. Therefore, information one.g. aVANET isalsopossible withthehelpofthereadily available location, direction, speed, anddriver preferences areimportant IEEE802.11e standard, buttoalower extent. lcto,drcin pe,addie rfrne r motn parameters influencing thevalueofwarning messages. In