On hopping strategies for autonomous wireless networks

  • Authors:
  • Pedro H. J. Nardelli;Giuseppe T. F. De Abreu

  • Affiliations:
  • University of Oulu, Oulu, Finland;University of Oulu, Oulu, Finland

  • Venue:
  • GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
  • Year:
  • 2009

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Abstract

The transmission capacity (TmC) of an ad hoc network measures the area spectral efficiency (in bits/sec×Hz×m2) of successful transmissions as a function of the required transmission rate in single-hop links τ, under the assumption that the average density of active links λat in the network is given [1]. In reality, however, the probability that a node wishing to transmit becomes active is conditioned on the availability of a receiving peer. Consequently, λat is not a given parameter but rather a function of topological parameters. In this paper, we employ stochastic-geometric tools to obtain an expression of λat as a function of the transmission range d and network density λ, and apply the result to evaluate the transmission capacity of autonomous interference-limited networks. We then use the TmC to study the impact of closest-neighbor, furthest-neighbor and random-neighbor hopping strategies on the performance of such networks. It is shown that amongst these alternatives, the closest-neighbor strategy always achieves the highest transmission capacity. Furthermore, it is found that the advantage of closest-neighbor hopping is more significant in networks with high densities, large transmission ranges and/or higher required rates, where interference is the dominant limiting factor. In noninterference-limited networks, however, the three strategies are equivalent.