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 ebook constitutes the refereed complaints 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 a hundred and fifty submissions. All present features of ad-hoc networking, sensor networks, cellular, instant, and cooperating communique structures are addressed together with, multicast, broadcast, functionality, QoS, routing protocols, scalability, safeguard, hybrid networks, self-organization, auto-configuration, strength intake, peer-to-peer platforms, and MAC protocols.

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Extra info for Ad-Hoc, Mobile, and Wireless Networks: Third International Conference, ADHOC-NOW 2004, Vancouver, Canada, July 22-24, 2004. Proceedings

Sample text

Other feasible heuristics which behave more reactively are the selection of the TTL to cover only the first source, the TTL which covers a certain number of sources, the TTL which covers a certain percentage of its sources, etc. The selection of the maximum source coverage is because our main concern is maintaining a high packet delivery ratio as close as possible to the proactive approach at a low overhead. The other heuristics tend to produce in some scenarios less overhead than the selected one, but would achieve a lower packet delivery ratio and would have been less scalable regarding the number of sources.

The MAC protocol starts dropping a significant number of packets due to queue overflow. The network efficiency is largely independent of the number of multicast senders and mobility rate. In FLOOD, every packet is transmitted up to 50 times. Therefore, the PSR is 5 (50 packet transmissions for 10 packet receptions) for 10 multicast receivers and 1 (50 packet transmissions for 50 packet receptions) for 50 multicast receivers. This is approximately true for all multicast sender scenarios. Even when the packet delivery ratio falls to significantly below 100% in the 10 multicast sender cases, the total number of packet transmissions at the MAC layer falls proportionally.

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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