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Performance Evaluation of Downlink Multi-User Massive MIMO with Configurable Active Antenna System and Inter Access Point Coordination in Low-SHF-Band

Yi JIANG, Kenichiro YAMAZAKI, Toshihiro HAYATA, Kohei IZUI, Kanada NAKAYASU, Toshifumi SATO, Tatsuki OKUYAMA, Jun MASHINO, Satoshi SUYAMA, Yukihiko OKUMURA

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Summary :

Massive multiple input and multiple output (Massive MIMO) is a key technique to achieve high system capacity and user data rate for the fifth generation (5G) radio access network (RAN). To implement Massive MIMO in 5G, how much Massive MIMO meets our expectation with various user equipment (UEs) in different environments should be carefully addressed. We focused on using Massive MIMO in the low super-high-frequency (SHF) band, which is expected to be used for 5G commercial bands relatively soon. We previously developed a prototype low-SHF-band centralized-RAN Massive MIMO system that has a flexible active antenna system (AAS)-unit configuration and facilitates advanced radio coordination features, such as coordinated beamforming (CB) coordinated multi-point (CoMP). In this study, we conduct field trials to evaluate downlink (DL) multi-user (MU)-MIMO performance by using our prototype system in outdoor and indoor environments. The results indicate that about 96% of the maximum total DL system throughput can be achieved with 1 AAS unit outdoors and 2 AAS units indoors. We also investigate channel capacity based on the real propagation channel estimation data measured by the prototype system. Compared with without-CB mode, the channel capacity of with-CB mode increases by a maximum of 80% and 104%, respectively, when the location of UEs are randomly selected in the outdoor and indoor environments. Furthermore, the results from the field trial of with-CB mode with eight UEs indicate that the total DL system throughput and user data rate can be significantly improved.

Publication
IEICE TRANSACTIONS on Communications Vol.E102-B No.8 pp.1401-1410
Publication Date
2019/08/01
Publicized
2019/02/20
Online ISSN
1745-1345
DOI
10.1587/transcom.2018TTP0013
Type of Manuscript
Special Section PAPER (Special Section on Technology Trials and Proof-of-Concept Activities for 5G and Beyond)
Category

Authors

Yi JIANG
  the NEC Corporation
Kenichiro YAMAZAKI
  the NEC Corporation
Toshihiro HAYATA
  the NEC Corporation
Kohei IZUI
  the NEC Corporation
Kanada NAKAYASU
  the NEC Corporation
Toshifumi SATO
  the NEC Corporation
Tatsuki OKUYAMA
  the NTT DOCOMO, INC
Jun MASHINO
  the NTT DOCOMO, INC
Satoshi SUYAMA
  the NTT DOCOMO, INC
Yukihiko OKUMURA
  the NTT DOCOMO, INC

Keyword

5G,  Massive MIMO,  low-SHF-band,  MU-MIMO,  beamforming,  C-RAN,  CB,  CoMP