Shortest route mobility assisted packet delivery with soft maximum delay guarantees in mobile ad hoc networks

  • Authors:
  • Spyridon Vassilaras;Gregory S. Yovanof

  • Affiliations:
  • Athens Information Technology, P.O. Box 68, 19.5 km Markopoulo Ave., 19002 Peania Attikis, Greece;Athens Information Technology, P.O. Box 68, 19.5 km Markopoulo Ave., 19002 Peania Attikis, Greece

  • Venue:
  • Ad Hoc Networks
  • Year:
  • 2012

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Abstract

In delay tolerant Mobile Ad hoc Networks (MANETs) node mobility can be exploited in order to reduce the source-destination path lengths in the expense of higher packet delivery delays. This paper addresses the problem of minimizing the average source-destination path length under a maximum delay constraint for packet delivery which is desirable to certain applications. Imposing packet delivery deadlines results in a certain percentage of multi-hop packet transmissions and poses the practical problem of selecting the optimum moment for the transmission. We propose an Optimal Stopping Rule algorithm for solving this problem and show how this algorithm can be extended in the case that a source-destination route is not always available by relaxing the hard delay constraint to a soft (probabilistic) constraint. The performance of this algorithm is compared to the ideal case of scheduling with perfect knowledge of the future and the trade-off between higher allowable delay and lower average path length is illustrated through several Matlab and ns-2 simulation results. As an application of path length minimization we explain how this can lead to energy consumption minimization in a MANET with light traffic loads (low probability of collisions). Finally, we briefly discuss how this path length minimization algorithm can guide the development of cross-layer throughput maximization algorithms with soft maximum delay guarantees.