Ad-Hoc, Mobile, and Wireless Networks: Third International by Errol L. Lloyd, Rui Liu, S. S. Ravi (auth.), Ioanis

By Errol L. Lloyd, Rui Liu, S. S. Ravi (auth.), Ioanis Nikolaidis, Michel Barbeau, Evangelos Kranakis (eds.)

This e-book constitutes the refereed court cases 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 provided have been rigorously reviewed and chosen from greater than one hundred fifty submissions. All present elements of ad-hoc networking, sensor networks, cellular, instant, and cooperating verbal exchange platforms are addressed together with, multicast, broadcast, functionality, QoS, routing protocols, scalability, protection, hybrid networks, self-organization, auto-configuration, strength intake, peer-to-peer structures, 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

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2 Related Work How to prolong system lifetime by reducing nodes’ energy consumption is an important research challenge for both Mobile Ad Hoc Networks (MANET) and wireless sensor networks (WSN). GAF [13] and SPAN [1] are typical energyefficient protocols for MANET. The energy conserving methods for MANET mainly consider the communication connectivity among mobile nodes, which 44 J. Jiang and W. Dou belong to point coverage problem [3]. On the other hand, area coverage should be emphasized in WSN to avoid sensing holes.

Four different traffic loads where tested consisting of 5, 10, 15, and 20 different CBR sources communicating with nodes in the fixed network. Each of these CBR sources start sending data at a time uniformly distributed between the first 10 Maximal Source Coverage Adaptive Gateway Discovery 37 seconds of the simulation. Each of the sources generates 512 bytes data packets at a rate of 5 packets per second (20Kb/s). 1 Performance Metrics To assess the effectiveness of the different gateway discovery mechanisms, we have used the following performance metrics: – Packet delivery ratio.

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. The differences in overhead are also lesser as the number of sources increase. As explained in our analytical model, this is due to the cost required in the reactive appraoch in which the sources are required to perform a network-wide search of the gateways. 80000 100000 reactive proactive hybrid adaptive 70000 80000 Routing Overhead (# msgs) 60000 Routing Overhead (# msgs) reactive proactive hybrid adaptive 90000 50000 40000 30000 20000 70000 60000 50000 40000 30000 10000 20000 0 10000 0 100 200 300 400 500 Pause time (s) (a) 10 sources 600 700 800 900 0 100 200 300 400 500 Pause time (s) 600 700 800 900 (b) 15 sources Fig.

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