Hybrid time slot allocation algorithm based on LoRa Internet of things

作     者：Yao Yindi Wang Lei He Junjin Yao Yindi;Wang Lei;He Junjin

作者机构：School of Communication EngineeringXi'an University of Posts and TelecommunicationsXi'an 710121China 

出 版 物：《The Journal of China Universities of Posts and Telecommunications》 (中国邮电高校学报（英文版）)

年 卷 期：2020年第27卷第4期

页      面：83-90页

核心收录：

学科分类：1305[艺术学-设计学（可授艺术学、工学学位）] 080904[工学-电磁场与微波技术] 0810[工学-信息与通信工程] 13[艺术学] 0809[工学-电子科学与技术（可授工学、理学学位）] 081104[工学-模式识别与智能系统] 08[工学] 0804[工学-仪器科学与技术] 080402[工学-测试计量技术及仪器] 081001[工学-通信与信息系统] 081101[工学-控制理论与控制工程] 0811[工学-控制科学与工程] 

基　　金：supported by the Shaanxi Science and Technology Department of International Science ( 2018KW025 ) he Xi’an Science and Technology Plan Project and Technology Cooperation Program ( 2019218114GXRC017CG018GXYD17. 2 ) the Shaanxi Provincial Department of Education Special Scientific Research Plan ( 18JK0700 ) the IoT Innovation Team for Talent Promotion Plan of Shaanxi Province Support ( 2019TD-028) 

主　　题：competitive time slot LoRa networking TDMA fixed time slot slot allocations 

摘      要：To improve the efficiency and stability of data transmission in the long-range(LoRa) Internet of things(IoT),a hybrid time slot allocation algorithm is proposed, which implements a priority mechanism with high-priority nodes sending data in fixed time slots and low-priority nodes using the carrier sense multiple access(CSMA) algorithm to compete for shared time slots to transmit data. To improve network efficiency, a gateway is used to adjust the time slot allocation policy according to network status and balance the number of fixed and shared time slots. And more, a retransmission time slot is added to the time slot allocation algorithm, which redesigns the time frame structure, and adopts a retransmission mechanism to improve communication reliability. Simulation and measurement results show that the packet loss rate and transmission delay of the proposed hybrid algorithm are smaller than those of the fixed slot allocation algorithm, making the proposed algorithm more suitable for LoRa IoT.