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Rate Adaptation for Robust and Low-Latency Video Transmissions Using Multi-AP Wireless LAN

Kazuma YAMAMOTO, Hiroyuki YOMO

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Summary :

In this paper, we propose rate adaptation mechanisms for robust and low-latency video transmissions exploiting multiple access points (Multi-AP) wireless local area networks (WLANs). The Multi-AP video transmissions employ link-level broadcast and packet-level forward error correction (FEC) in order to realize robust and low-latency video transmissions from a WLAN station (STA) to a gateway (GW). The PHY (physical layer) rate and FEC rate play a key role to control trade-off between the achieved reliability and airtime (i.e., occupancy period of the shared channel) for Multi-AP WLANs. In order to finely control this trade-off while improving the transmitted video quality, the proposed rate adaptation controls PHY rate and FEC rate to be employed for Multi-AP transmissions based on the link quality and frame format of conveyed video traffic. With computer simulations, we evaluate and investigate the effectiveness of the proposed rate adaptation in terms of packet delivery rate (PDR), airtime, delay, and peak signal to noise ratio (PSNR). Furthermore, the quality of video is assessed by using the traffic encoded/decoded by the actual video encoder/decoder. All these results show that the proposed rate adaptation controls trade-off between the reliability and airtime well while offering the high-quality and low-latency video transmissions.

Publication
IEICE TRANSACTIONS on Communications Vol.E105-B No.2 pp.177-185
Publication Date
2022/02/01
Publicized
2021/08/20
Online ISSN
1745-1345
DOI
10.1587/transcom.2021CEP0015
Type of Manuscript
Special Section PAPER (Special Section on Emerging Communication Technologies in Conjunction with Main Topics of ICETC2020)
Category

Authors

Kazuma YAMAMOTO
  Kansai University
Hiroyuki YOMO
  Kansai University

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