By Errol L. Lloyd, Rui Liu, S. S. Ravi (auth.), Ioanis Nikolaidis, Michel Barbeau, Evangelos Kranakis (eds.)
This booklet constitutes the refereed lawsuits of the 3rd foreign convention on Ad-Hoc Networks and instant, ADHOC-NOW 2004, held in Vancouver, Canada in July 2004.
The 22 revised complete papers and eight revised brief papers offered have been rigorously reviewed and chosen from greater than one hundred fifty submissions. All present facets of ad-hoc networking, sensor networks, cellular, instant, and cooperating conversation platforms are addressed together with, multicast, broadcast, functionality, QoS, routing protocols, scalability, safety, hybrid networks, self-organization, auto-configuration, power intake, peer-to-peer platforms, and MAC protocols.
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Additional info for Ad-Hoc, Mobile, and Wireless Networks: Third International Conference, ADHOC-NOW 2004, Vancouver, Canada, July 22-24, 2004. Proceedings
RREP and RREQ messages are extended with a new ﬂag (”I”) which is used to diﬀerentiate usual RREP and RREQ messages from those used to discover routes to the Internet. We refer to the new messages as RREP I and RREQ I. A source willing to communicate with a node in the ﬁxed network, will ﬁrst attempt to contact it within the ad hoc network doing an extended ring search (as described below). If no answer is received after a network-wide search, then the source tries to ﬁnd a route towards the Internet.
Number of default route expirations per source will be given by E[Nbreak ] = λdur · t. Accordingly, the total overhead for the proactive route discovery will consist of the initial overhead so that every source gets aware that their destination is a ﬁxed node, plus the overhead associated to the proactive discovery of the gateways whenever their default route expires or breaks. This overhead can be computed according to equation (5). Ωr = [ΩF N + (Ωr−gw · λdur · t)] · S (5) The hybrid gateway discovery scheme, has an overhead which is a combination of the overheads of the other approaches.
The proactive approach also starts working worse because its high control packet load does not leave enough resources to carry all the data packets generated by the sources. However, the proposed approach is able to ﬁnd a good trade-oﬀ between the signaling overhead and the proactivity of the protocol. Regarding the routing overhead, a similar trend is observed. As it is depicted in ﬁgures 6 (a) and 6 (b), the proposed approach has a lower overhead than the proactive approach and a little bit more than the reactive and hybrid ones.