On the multicast throughput capacity of network coding in wireless ad-hoc networks

  • Authors:
  • Shirish Karande;Zheng Wang;Hamid R. Sadjadpour;Jose Joaquin Garcia-Luna-Aceves

  • Affiliations:
  • Philips Research Bangalore, Bangalore, India;University of California, Santa Cruz, Santa Cruz, USA;University of California, Santa Cruz, Santa Cruz, USA;University of California, Santa Cruz and Palo Alto Research Center (PARC), Santa Cruz and Palo Alto, USA

  • Venue:
  • Proceedings of the 2nd ACM international workshop on Foundations of wireless ad hoc and sensor networking and computing
  • Year:
  • 2009

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Abstract

We study the contribution of network coding (NC) in improving the multicast capacity of random wireless ad hoc networks. We consider a network with $n$ nodes distributed uniformly in a unit square, with each node acting as a source for independent information to be sent to a multicast group consisting of m randomly chosen destinations. We consider the physical model, and show that the per-session capacity in the presence of arbitrary NC has a tight bound of θ (1/√mn) when m = O (n/(log(n))3), and θ (1/n) when m = Ω(n/log n)). Prior work has shown that these same order bounds are achievable on the basis of pure routing, which utilizes only traditional store and forward methods. Therefore, our results demonstrate that the NC gain for multi-source multicast and broadcast is bounded by a constant factor.