User-Centric Design of Millimeter Wave Communications for Beyond 5G and 6G

Koji ISHIBASHI
Takanori HARA
Sota UCHIMURA
Tetsuya IYE
Yoshimi FUJII
Takahide MURAKAMI
Hiroyuki SHINBO

Publication
IEICE TRANSACTIONS on Communications   Vol.E105-B    No.10    pp.1117-1129
Publication Date: 2022/10/01
Publicized: 2022/07/13
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2021MEI0002
Type of Manuscript: Special Section INVITED PAPER (Special Section on Multidisciplinary and Innovative Key technologies in Advanced communication systems (MIKA))
Category: 
Keyword: 
beyond 5G,  6G,  millimeter wave,  radio access network (RAN),  low-latency massive access,  robust coordinated multi-point (CoMP),  blockage prediction,  

Full Text: FreePDF

Summary: 
In this paper, we propose new radio access network (RAN) architecture for reliable millimeter-wave (mmWave) communications, which has the flexibility to meet users' diverse and fluctuating requirements in terms of communication quality. This architecture is composed of multiple radio units (RUs) connected to a common distributed unit (DU) via fronthaul links to virtually enlarge its coverage. We further present grant-free non-orthogonal multiple access (GF-NOMA) for low-latency uplink communications with a massive number of users and robust coordinated multi-point (CoMP) transmission using blockage prediction for uplink/downlink communications with a high data rate and a guaranteed minimum data rate as the technical pillars of the proposed RAN. The numerical results indicate that our proposed architecture can meet completely different user requirements and realize a user-centric design of the RAN for beyond 5G/6G.