Joint Radio Resources Allocation in the Coexisting NR-U and Wi-Fi Networks

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With the rapid development of mobile devices, limited licensed spectrum resources can no longer meet the explosive growth of data traffic demand. Therefore, the industry and academia have set their sights on utilizing the unlicensed spectrum in the cellular network which is mainly used by the Wi-Fi network. As a result, it is crucial for the cellular network to harmoniously coexist with the Wi-Fi networks. Recently, the new radio in unlicensed spectrum (NR-U) network has been proposed to address the coexistence between the cellular and Wi-Fi networks from the perspective of beam or space. However, the spatial resource in cellular base stations (BSs), especially in the small-cell BSs, may be insufficient. In this work, we propose a novel joint spatial-temporal domain based scheme to address this. The joint resource allocation problem is formulated to maximize the total throughput of the coexisting NR-U and Wi-Fi networks. By using the mixed integer quadratic programming (MIQP), a joint spatial-temporal resource allocation scheme is obtained. Simulation results show that the joint spatial-temporal domain coexistence scheme can achieve a maximum of 30% and 58.3% gain in terms of the total throughput performance as compared with the sole carrier sense adaptive transmission (CSAT) and interference nulling scheme, respectively, under insufficient spatial resources.