基于WIA-FA的无线AGV系统有序可靠重传方法

Ordered and Reliable Retransmission Method for Wireless AGV Systems Based on WIA-FA

  • 摘要: 近年来,工业无线网络在自动引导车(automated guided vehicle,AGV)系统的应用愈来愈广泛。目前的AGV通信主要依赖于WiFi技术,由于其采用竞争式接入机制,无法满足恶劣工业环境下的有序和可靠传输要求。因此,本文提出一种基于WIA-FA的无线AGV系统有序可靠重传方法。首先,给出基于WIA-FA的AGV通信系统架构和数据传输过程,并设计一种新的超帧结构以满足数据传输的严格顺序性要求。进而,基于新超帧,设计一种基于有序调度的端到端重传策略(sequential scheduling based end-to-end retransmission,SSER),可实现上行数据的按需传输和下行数据的按序传输,并支持上行和下行数据时段长度的动态优化。仿真结果表明,在不同超帧长度、节点数量和信道条件等网络参数设置下,SSER在传输可靠性方面均优于现有工作。

     

    Abstract: Recently, industrial wireless networks have been increasingly adopted in automated guided vehicle (AGV) applications. Current AGV communications primarily depend on Wi-Fi technology that employs contention-based access methods and thus cannot meet the requirement of ordered and reliable wireless transmission in harsh industrial environments. To this end, we investigate an ordered and reliable retransmission method for wireless AGV systems based on WIA-FA. First, the communication system architecture and data transmission process of WIA-FA-based AGV systems are presented. A new superframe structure is designed to guarantee strictly ordered transmission.Then, on the basis of the new superframe, a sequential scheduling-based end-to-end retransmission (SSER) strategy is proposed. SSER realizes on-demand transmission for uplink data and sequential transmission for downlink data and supports the dynamic optimization of durations for uplink and downlink data phases. Simulation results show that SSER outperforms existing works in terms of transmission reliability under different network parameter settings, such as superframe length, number of nodes, and channel conditions.

     

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