A Novel Multi-AP Diversity for Highly Reliable Transmissions in Wireless LANs

Toshihisa NABETANI  Masahiro SEKIYA  

IEICE TRANSACTIONS on Communications   Vol.E104-B   No.7   pp.913-921
Publication Date: 2021/07/01
Publicized: 2021/01/08
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2020EBP3112
Type of Manuscript: PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
wireless LAN,  multi-AP diversity,  reliability,  latency,  factory,  

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With the development of the IEEE 802.11 standard for wireless LANs, there has been an enormous increase in the usage of wireless LANs in factories, plants, and other industrial environments. In industrial applications, wireless LAN systems require high reliability for stable real-time communications. In this paper, we propose a multi-access-point (AP) diversity method that contributes to the realization of robust data transmissions toward realization of ultra-reliable low-latency communications (URLLC) in wireless LANs. The proposed method can obtain a diversity effect of multipaths with independent transmission errors and collisions without modification of the IEEE 802.11 standard or increasing overhead of communication resources. We evaluate the effects of the proposed method by numerical analysis, develop a prototype to demonstrate its feasibility, and perform experiments using the prototype in a factory wireless environment. These numerical evaluations and experiments show that the proposed method increases reliability and decreases transmission delay.