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

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

This ebook constitutes the refereed lawsuits of the 3rd overseas 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 conscientiously reviewed and chosen from greater than a hundred and fifty submissions. All present facets of ad-hoc networking, sensor networks, cellular, instant, and cooperating verbal exchange structures are addressed together with, multicast, broadcast, functionality, QoS, routing protocols, scalability, safeguard, hybrid networks, self-organization, auto-configuration, power intake, peer-to-peer structures, 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

Example text

NGW i=1 NrGWi (t) (7) N − NGW If we denote Nc as the number of sources being covered by any gateway when using a TTL of t, then Nc is a random variable obeying a binomial distribution B ∼ (S, Pc (t)). Thus, the mean number of sources being covered when gateways use a TTL of t can be computed as E[Nc ] = S · Pc (t). So, the overall overhead of the hybrid approach consists of three different parts: the overhead associated to realize that the destinations are fixed nodes, the overhead associated to the propagation of GWADV messages over t hops by each gateway, and the overhead required so that those sources not covered by the GWADV messages can find the gateways and create a default route.

However, the protocol implementation takes great care to avoid such collisions, randomly jittering re-broadcasts by 10 ms. , listen to the media and apply random backoff when media is busy), reducing the chances of collision errors even further. In addition, a receiver can receive a specific data packet over multiple different “paths”. Loosing the flooded data packet over all such paths due to collisions is rare indeed, as shown by the high packet delivery ratios for 1 and 2 senders. However, with 5 or 10 senders, the network starts to experience congestion.

Rc ≥ 2rs . Since it is possible to control and adjust sensor’s radio power, this assumption can be easily satisfied. In our following description, we assume that rc = 2rs . (3) Each sensor knows its own position. The location information can be obtained by means of GPS or other localization service. Many research efforts into localization problem in wireless sensor network [14,15] make this assumption realistic. (4) No more than one sensor is located at the same position. If there is more than one sensor at the same location, in each time round, one sensor can be randomly chosen as active and others go into sleep state.

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