A Communication Protocol to Eliminate Hidden/Exposed Terminal Problem with Full-duplex Wireless Communications

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K22845
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 60:Information science, computer engineering, and related fields
• Research Institution: Wakayama University
• Principal Investigator: Yoshihiro Takuya 和歌山大学, システム工学部, 准教授 (80362862)
• Project Period (FY): 2019-06-28 – 2022-03-31
• Keywords: CSMA/CA / IEEE802.11 / MACプロトコル / 受信電波強度

Outline of Final Research Achievements

This study proposes a method to extend CSMA/CA, a medium access control (MAC) method used in widely used wireless communication technologies such as IEEE802.11, by combining full-duplex wireless communication technology and newly developed Ack multiplexing technology, to significantly reduce the effects of hidden and exposed terminals. The proposed method significantly reduces the impact of the hidden/exposed terminal problem, which has been an issue since the early days of wireless communications, and achieves low latency and high throughput communications. Experiments using a software radio system showed that the method can detect Ack and CTS with high accuracy using only the reception radio strength without modulation. Simulation evaluation using the detection thresholds obtained from the actual experiments showed that the proposed MAC protocol has high performance.

Free Research Field

情報ネットワーク

Academic Significance and Societal Importance of the Research Achievements

本研究は、世界で広く用いられているIEEE802.11において通信効率を著しく低下させている隠れ・晒し端末問題の悪影響を大幅に低減し、これまで以上に通信速度が求められる将来の通信方式を実現するための選択肢の一つとして、新たな技術を開発した。技術的にも新たな方法論として価値があり、波及効果が期待されるため社会的意義がある。本研究において提案した、全二重通信を応用したAckやCTSの多重受信技術の新規性は高く、本技術によってIEEE802.11を大幅に性能向上できる可能性が示された。