基于TDMA的LoRa通信网络设计

Design of LoRa Communication Network Based on TDMA

针对LoRa通信技术具有长距离传输和抗干扰能力强但只支持半双工通信的特点,提出一种基于TDMA的通信组网方法;该方法通过划分信道和时隙可在同一个信道下容纳多个通信设备,在信道资源有限的情况下可充分利用信道;基于LoRa的UE设备以星型组网的方式接入基于LoRa的中心基站,中心基站可以控制接入的设备以及对信道时隙管理,加上适当的网关还可以接入互联网;为提高信道时隙的利用率以及手持UE人员的活动范围,采用随机接入中心基站的方法;根据该通信组网方式的特性,设计出对应的上下行通信协议和对UE添加唯一标号,这很好地解决了接入基站过程中的竞争冲突;实验测试表明基于TDMA的LoRa组网能随机接入中心基站扩大使用人员的活动范围,并提高信道利用率。

Aiming at the characteristics of long-distance transmission and anti-interference ability of LoRa communication technology but only supporting half-duplex communication, a TDMA-based communication networking method is proposed. The method can accommodate multiple communication devices under the same channel by dividing channels and time slots, and can fully utilize the channel when channel resources are limited. The LoRa-based UE equipment accesses the LoRa-based central base station in a star-shaped networking manner, and the central base station can control the accessed equipment and the channel time slot management, and the appropriate gateway can also access the Internet. In order to improve the utilization of channel time slots and the range of activities of the handheld UE personnel, a method of randomly accessing the central base station is adopted. According to the characteristics of the communication networking mode, the corresponding uplink and downlink communication protocol is designed and a unique label is added to the UE, which satisfactorily solves the contention conflict in the process of accessing the base station. Experimental tests show that the TDMA-based LoRa network can randomly access the central base station to expand the range of activities of the users and improve channel utilization.