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Abstract: We consider the design of cognitive Medium Access Control MAC protocolsenabling a secondary unlicensed transmitter-receiver pair to communicate overthe idle periods of a set of primary licensed channels. More specifically, wepropose cognitive MAC protocols optimized for both slotted and un-slottedprimary networks. For the slotted structure, the objective is to maximize thesecondary throughput while maintaining synchronization between the secondarypair and not causing interference to the primary network. Our investigationsdifferentiate between two sensing scenarios. In the first, the secondarytransmitter is capable of sensing all the primary channels, whereas it sensesonly a subset of the primary channels in the second scenario. In both cases, wepropose blind MAC protocols that efficiently learn the statistics of theprimary traffic on-line and asymptotically achieve the throughput obtained whenprior knowledge of primary traffic statistics is available. For the un-slottedstructure, the objective is to maximize the secondary throughput whilesatisfying an interference constraint on the primary network. Sensing-dependentperiods are optimized for each primary channel yielding a MAC protocol whichoutperforms previously proposed techniques that rely on a single sensing periodoptimization.



Author: Omar Mehanna, Ahmed Sultan, Hesham El Gamal

Source: https://arxiv.org/







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