| 摘要: |
| 为实现工业5G在非授权频段的高实时、高可靠无线通信，提出了一种多优先级的动态信道接入方法，以满足异构工业任务的按需通信。该方法通过对多种无线网络共享的非授权频段进行实时信道监听，可以根据信道占用率动态切换信道接入方式，包括随机接入和确定性接入。其中，根据异构工业任务的实时性要求，定义了多种接入优先级，并确定合适的竞争和退避时间窗口。仿真结果表明，在工业多设备接入场景下，所提方法的信道传输可靠性达到99.99%，并且实时性比WiFi的载波侦听多路接入/碰撞避免机制（Carrier Sense Multiple Access with Collision Avoidance，CSMA/CA）和授权辅助接入（Licensed Assisted Access，LAA）的先听后说（Listen before Talk，LBT）机制分别提升了24.7%和46.3%。 |
| 关键词: 工业5G 非授权频段 多优先级信道接入 先听后说(LBT) |
| DOI：10.20079/j.issn.1001-893x.230903003 |
|
| 基金项目:国家自然科学基金资助项目(62173322,92267108,62133014,61972389);辽宁省科学技术计划(2023JH3/10200004, 2023JH3/10200006, 2022JH25/10100005) |
|
| A Dynamic Multi-priority Access Method for Industrial 5G in Unlicensed Bands |
| WANG Xiulian,ZHU Jian,ZHANG Lei,XU Chi,JIN Xi,XIA Changqing |
| (1.College of Automation and Electrical Engineering,Shenyang Ligong University,Shenyang 110159,China;2.Key Laboratory of Networked Control Systems,Chinese Academy of Sciences,Shenyang 110016,China;3.Shenyang Institute of Automation,Chinese Academy of Sciences,Shenyang 110169,China;4.Institutes for Robotics & Intelligent Manufacturing,Chinese Academy of Sciences,Shenyang 110169,China;5.Unit 93010 of the PLA,Shenyang 110015,China) |
| Abstract: |
| To achieve high real-time and reliable wireless communication in unlicensed bands for industrial 5G,a dynamic multi-priority channel access method is proposed to meet on-demand communication for heterogeneous industrial tasks.The method allows dynamic switching of channel access methods,including random access and deterministic access,according to channel occupancy by real-time channel listening to unlicensed bands shared by multiple wireless networks.Among them,multiple access priorities are defined based on the real-time requirements of heterogeneous industrial tasks,and suitable competition and receding time windows are determined.The simulation results indicate that,in an industrial multi-device access scenario,the proposed method achieves a channel transmission reliability of 99.99%.Moreover,its real-time performance is significantly better than that of the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) mechanism of WiFi and the Listen Before Talk (LBT) mechanism of Licensed Assisted Access (LAA),with improvements of 24.7% and 46.3% respectively. |
| Key words: industrial 5G unlicensed bands multi-priority channel access listen before talk (LBT) |
