Towards jamming-resistant and competitive medium access in the SINR model

ABSTRACT

The efficient coordination of medium access is arguably one of the most relevant applications of distributed computing. Recently, progress has been made in the design of robust medium access (MAC) protocols that guarantee a competitive throughput against a powerful jammer which can block the medium an arbitrary constant fraction (1-ε) of the time. These MAC protocols exploit the remaining ε-fraction optimally in the sense that a significant part is used for successful transmissions. However, so far these throughput guarantees only hold for rather simplistic interference models such as Unit Disk Graphs.

This paper reports on our first insights on the design of a robust medium access protocol SINRMAC for the more realistic physical interference model which takes into account the signal to interference plus noise ratio (SINR) at the receiver. This model is more difficult, as there is no longer an objective distinction of idling and busy time periods which can be used to dynamically adjust the wireless nodes' backoff periods. We discuss an approach that introduces individual "idle/busy thresholds" which are adapted dynamically and, unlike the multiplicative backoff periods, in an additive manner. We find that a reasonable convergence speed (and throughput) can be achieved if there exists some meaningful upper bound τ on the noise level in the network; surprisingly, however, our first simulation results indicate that adaptive changes of the idly/busy thresholds do not yield a better throughput than static thresholds set to τ.

References

1. B. Awerbuch, A. Richa, and C. Scheideler. A jamming-resistant MAC protocol for single-hop wireless networks. In Proc. of PODC '08, 2008.
2. D. Blough, C. Canali, G. Resta, and P. Santi. On the impact of far-away interference on evaluations of wireless multihop networks. In Proc. MSWIM, 2009.
3. A. Richa, C. Scheideler, S. Schmid, and J. Zhang. A jamming-resistant MAC protocol for multi-hop wireless networks. In Proc. DISC, 2010.
4. A. Richa, C. Scheideler, S. Schmid, and J. Zhang. Competitive and fair medium access despite reactive jamming. In Proc. ICDCS, 2011.
5. A. Richa, C. Scheideler, S. Schmid, and J. Zhang. Self-stabilizing leader election for single-hop wireless networks despite jamming. In Proc. MobiHoc, 2011.

Index Terms

• Computer systems organization

  • Architectures

    • Distributed architectures

• Software and its engineering

  • Software organization and properties

    • Software system structures

      • Distributed systems organizing principles

• Theory of computation

  • Design and analysis of algorithms