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Millimeter wave (mmW) communications at the 60 GHz unlicensed band is seen asa promising approach for boosting the capacity of wireless local area networks(WLANs). If properly integrated into legacy IEEE 802.11 standards, mmWcommunications can offer substantial gains by offloading traffic from congestedsub-6 GHz unlicensed bands to the 60 GHz mmW frequency band. In this paper, anovel medium access control (MAC) is proposed to dynamically manage the WLANtraffic over the unlicensed mmW and sub-6 GHz bands. The proposed protocolleverages the capability of advanced multi-band wireless stations (STAs) toperform fast session transfers (FST) to the mmW band, while considering theintermittent channel at the 60 GHz band and the level of congestion observedover the sub-6 GHz bands. The performance of the proposed scheme isanalytically studied via a new Markov chain model and the probability oftransmissions over the mmW and sub-6 GHz bands, as well as the aggregatedsaturation throughput are derived. In addition, analytical results arevalidated by simulation results. Simulation results show that the proposedintegrated mmW-sub 6 GHz MAC protocol yields significant performance gains, interms of maximizing the saturation throughput and minimizing the delayexperienced by the STAs. The results also shed light on the tradeoffs betweenthe achievable gains and the overhead introduced by the FST procedure.

Performance Analysis of Integrated Sub-6 GHz-Millimeter Wave Wireless Local Area Networks