Intelligent hybrid automatic repeat request retransmission for multi‐band Wi‐Fi networks

Abstract

Abstract With the increase of Wi‐Fi connections and throughput, the problems posed by unreliable connection and unstable delay need to be urgently solved through advanced methods. The IEEE 802.11ax standard was designed to improve the reliability of connection and increase the throughput in dense Wi‐Fi scenario where the inter‐site interference becomes more serious and the spectral resources are more insufficient. Furthermore, in the next generation of Wi‐Fi standard IEEE 802.11be, the hybrid automatic repeat request (HARQ) and multi‐band technologies will be introduced to solve the problems of unstable delay, serious interference and insufficient spectrum resources. In this paper, retransmission schemes combined multi‐band and hybrid automatic repeat request are deeply studied to improve the retransmission efficiency. Combining hybrid automatic repeat request with multi‐band, this paper proposes three kinds of retransmission mode: insisting on the current frequency band (ICFB) retransmission, switching to the backup frequency band (SBFB) retransmission and concurrent retransmitting on dual‐band (CRDB). Then, an intelligent selection algorithm of retransmission mode based on machine learning is designed to determine the optimal mode. Theoretical analysis and experimental results show that the proposed method can greatly improve the retransmission efficiency and thereby reduce the transmission latency and increase the throughput for multi‐band Wi‐Fi networks.

Keywords

• Electromagnetic compatibility and interference
• Protocols
• Computer communications
• Radio links and equipment
• Protocols
• Local area networks