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UAV-Assisted Heterogeneous Cloud Radio Access Network With Comprehensive Interference Management | IEEE Journals & Magazine | IEEE Xplore

UAV-Assisted Heterogeneous Cloud Radio Access Network With Comprehensive Interference Management


Abstract:

Heterogeneous networks (HetNets) are considered as typical application scenarios in the beyond 5th generation (B5G) and the 6th generation (6G) networks. The conventional...Show More

Abstract:

Heterogeneous networks (HetNets) are considered as typical application scenarios in the beyond 5th generation (B5G) and the 6th generation (6G) networks. The conventional on-ground base station (BS) has heavy traffic burden for seamless coverage and user equipments (UEs) suffer severe interference. To address these challenges, we propose a heterogeneous cloud radio access network (H-CRAN) architecture assisted by multiple unmanned aerial vehicles (UAVs). Specifically, multiple UAVs serve as flying remote radio heads (RRHs), collaborating with the macro base station (MBS), while the baseband units (BBUs) in the cloud handle processing and computing tasks. Firstly, we explore the optimal sector division scheme for the MBS and the corresponding UAV deployment scheme, considering factors like the UAV working efficiency and the overhead of interference management (IM). Despite leveraging UAVs to enhance services and offload traffic from the MBS, the proposed network inevitably encounters various categories of interference, i.e., backhaul interference, co-channel interference and multi-tier interference. To mitigate these issues, the cloud radio access networks (C-RANs) technique is employed for solving the backhaul interference. In addition, effective spatial multiplexing measures, namely sector division and beamforming are adopted by the MBS and UAV respectively to suppress the co-channel interference. We further design SIC-STIA-IS scheme, incorporating successive interference cancellation (SIC), space-time interference alignment (STIA) and interference steering (IS) scheme, to manage the cross-tier interference (CTI), intra-tier interference (ITI) and inter-cell interference (ICI), respectively. The in-depth simulation and numerical results verify that by adopting SIC-STIA-IS scheme, the proposed UAV-assisted H-CRAN architecture has superb performance in the spectral efficiency (SE).
Published in: IEEE Transactions on Vehicular Technology ( Volume: 73, Issue: 1, January 2024)
Page(s): 843 - 859
Date of Publication: 18 August 2023

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