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.
Ordered and Reliable Retransmission Method for Wireless AGV Systems Based on WIA-FA
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 or-dered 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 retransmis-sion(SSER)strategy is proposed.SSER realizes on-demand transmission for uplink data and se-quential transmission for downlink data and supports the dynamic optimization of durations for up-link 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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