Conference Paper

Real-time implications of multiple transmission rates in wireless networks.

DOI: 10.1145/1287853.1287893 In proceeding of: Proceedings of the 13th Annual International Conference on Mobile Computing and Networking, MOBICOM 2007, Montréal, Québec, Canada, September 9-14, 2007
Source: DBLP

ABSTRACT Wireless networks are increasingly being used for latency-sensitive applications that require data delivery to be timely, efficient and reliable. This trend is primarily driven by the proliferation of wireless networks of real-time data-gathering sensor-actuator devices. This has led to a strong need to bring real-time concerns to the forefront of an integrated research thrust into wireless real-time systems. In this paper, we introduce and analyze a specific instance of the rich set of problems in this domain. We consider a wireless network serving real-time flows in which the underlying physical layer provides multiple transmission rates. Higher rates have more stringent SINR requirements and thus represent a trade-off between raw transmission speed and packet error rate. We adopt a first principles approach to the design of optimal real-time scheduling algorithms for such a multi-rate wireless network. We illustrate the inherent complexities of the problem through examples and obtain provably optimal structural results. We then characterize the optimal policy for an approximate model. Our theoretical analysis provides guidelines for heuristic scheduler design. Our initial work indicates that this is a rich problem domain with the potential for a unifying theory that integrates real-time requirements into multi-rate wireless network design.

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    ABSTRACT: Wireless networks are increasingly being used for latency- sensitive applications that require data delivery to be timely, efficient and reliable. This trend is primarily driven by the proliferation of wireless networks of real-time data-gathering sensor-actuator devices. This has led to a strong need to bring real-time concerns to the forefront of an integrated research thrust into wireless real-time systems. In this pa- per, we introduce and analyze a specific instance of the rich set of problems in this domain. We consider a wireless net- work serving real-time flows in which the underlying physi- cal layer provides multiple transmission rates. Higher rates have more stringent SINR requirements and thus represent a trade-off between raw transmission speed and packet error rate. We adopt a first principles approach to the design of optimal real-time scheduling algorithms for such a multi-rate wireless network. We illustrate the inherent complexities of the problem through examples and obtain provably optimal structural results. We then characterize the optimal policy for an approximate model. Our theoretical analysis provides guidelines for heuristic scheduler design. Our initial work in- dicates that this is a rich problem domain with the potential for a unifying theory that integrates real-time requirements into multi-rate wireless network design.
  • [Show abstract] [Hide abstract]
    ABSTRACT: We consider the scheduling of multiclass jobs with deadlines to the completion of their service. Deadlines are deterministic and job arrivals in each class occur at the times of deadline expirations in the respective class. Assuming geometric service times with class dependent means, we derive structural properties of preemptive server allocation policies that maximize the expected number of job completions. Our work extends results that have appeared in the real-time wireless scheduling literature.
    Journal of Scheduling 08/2013; 16(4). · 0.94 Impact Factor

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