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MillimeterWave communications in the 60 GHz band are considered one of thekey technologies for enabling multi-gigabit wireless access. However, the highpropagation loss in such a band poses major obstacles to the optimalutilization of the wireless resources, where the problem of efficient clientassociation to access points (APs) is of vital importance. In this paper, theclient association in 60 GHz wireless access networks is investigated. The APutilization and the quality of the rapidly vanishing communication links arethe control parameters. Because of the tricky non-convex and combinatorialnature of the client association optimization problem, a novel solution methodis developed to guarantee balanced and fair resource allocation. A newdistributed, lightweight and easy to implement association algorithm, based onLagrangian duality theory and subgradient methods, was proposed. It is shownthat the algorithm is asymptotically optimal, that is, the relative duality gapdiminishes to zero as the number of clients increases. Both theoretical andnumerical results evince numerous useful properties of the algorithm, such asfast convergence, scalability, time efficiency, and fair execution incomparison to existing approaches. It is concluded that the proposed solutioncan be applied in the forthcoming 60 GHz wireless access networks.

Optimizing Client Association in 60 GHz Wireless Access Networks