Abstract
In this paper we compare impulse-radio ultra wideband (IR-UWB) physical layer related medium access control (MAC) protocols, Slotted Aloha and optional preamble mode six of IEEE 802.15.4–2011, and preamble sense multiple access when the events of false alarm and miss-detection are introduced. Furthermore, a generalized multi-slot channel access scheme is proposed that can, with a proper selection of slots, represent any of the above MAC protocols. As a result of the generalization, an efficiency factor is then proposed, which allows for the protocols to be compared efficiently. At present, the challenge of designing a random access protocol suitable for IR-UWB is however, not completely solved. The generalized multi-slot model and efficiency factor help in determining the optimal number of slots, given certain preamble lengths and channel conditions. While there does not exist a globally optimal solution for all combinations of preamble length and signal-to-noise ratio, this paper shows that dividing the maximum MAC protocol data unit from 4 to 8 equally-sized slots, each with their own preamble, provides the best solution in all but the extreme cases.
Published Version
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