Abstract-One of the most promising approaches to overcoming the uncertainty of millimeter wave (mm-wave) communications is to deploy dual-mode small base stations (SBSs) that integrate both mm-wave and microwave (μW) frequencies. In this paper, a novel approach to analyzing and managing mobility in joint mmwave-μW networks is proposed. The proposed approach leverages device-level caching along with the capabilities of dual-mode SBSs to minimize handover failures and reduce inter-frequency measurement energy consumption. First, fundamental results on the caching capabilities are derived for the proposed dual-mode network scenario. Second, the impact of caching on the number of handovers (HOs), energy consumption, and the average handover failure (HOF) is analyzed. Then, the proposed cache-enabled mobility management problem is formulated as a dynamic matching game between mobile user equipments (MUEs) and SBSs. The goal of this game is to find a distributed HO mechanism that, under network constraints on HOFs and limited cache sizes, allows each MUE to choose between: 1) executing an HO to a target SBS; 2) being connected to the macrocell base station; or 3) perform a transparent HO by using the cached content. To solve this dynamic matching problem, a novel algorithm is proposed and its convergence to a two-sided dynamically stable HO policy for MUEs and target SBSs is proved. Numerical results corroborate the analytical derivations and show that the proposed solution will significantly reduce both the HOF and energy consumption of MUEs, resulting in an enhanced mobility management for heterogeneous wireless networks with mm-wave capabilities. Index Terms-Millimeter wave communications, game theory, resource allocation. O. Semiari is with the Department of Electrical Engineering, Georgia Southern University, Statesboro, GA 30458 USA (e-mail: osemiari@ georgiasouthern.edu). W. Saad is with the Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061 USA (e-mail: walids@vt.edu). M. Bennis is with the Centre for Wireless Communications, University of Oulu, 90014 Oulu, Finland and also with the
In REF , a novel approach for analyzing and managing mobility in joint sub-6GHz-mmWave networks is proposed by leveraging on device caching along with the capabilities of dual-mode base stations to minimize handover failures, reduce inter-frequency measurement, reduce energy consumption, and provide seamless mobility in emerging dense heterogeneous networks.
Caching Meets Millimeter Wave Communications for Enhanced Mobility Management in 5G Networks
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Mathematics Computer Science