Adaptive adjustment method of LoRaWAN network rate based on channel state recognition

Abstract

The invention relates to an adaptive adjustment method of a LoRaWAN network rate based on channel state recognition, and belongs to the field of wireless technology of low power consumption wide areanetworks. The method comprises the following steps: firstly, constructing a path attenuation packet loss probability estimation model in combination with channel frequency and rate used by a terminal,and location information of the terminal; secondly, establishing a data collision packet loss probability estimation model according to LoRa data collision characteristics in combination with a message rate, a channel number and a data load; then, classifying channel states through estimated probability by using the Softmax regression classification method; and finally, establishing an adaptive rate adjustment mechanism based on the channel state recognition, and performing adaptive adjustment on the data rate of the terminal. According to the adaptive adjustment method provided by the invention, in the case of large-scale packet loss of a network, the packet loss reason is judged by recognizing the channel state, and the data rate of the terminal is specifically adjusted so as to avoid erroneous rate adjustment in the case of network data collision and to improve the data throughput and the data packet transmission reliability of the network.

Description

technical field [0001] The invention belongs to the field of low-power wide area network wireless technology, and relates to a LoRaWAN network rate self-adaptive adjustment method based on channel state identification. Background technique [0002] LoRa low power consumption wide area network technology has the characteristics of low power consumption and long transmission distance. The LoRaWAN protocol supports a variety of rate options, and its communication distance is inversely proportional to the transmission rate, that is, the faster the rate selected, the shorter the distance for successful communication. At the same time, due to the adoption of the spread spectrum technology, since the spread spectrum factors used at different rates are mutually orthogonal, the data transmission between the data transmission rates will not conflict with each other. In addition, the low-speed characteristics of LoRa result in a high air propagation time (ToA), which makes LoRa transm...

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Problems solved by technology

[0003] In the existing LoRaWAN adaptive selection mechanism, the packet loss rate is generally used as the index of rate selection, without considering the specific cause of packet loss, resulting in the constant reduction of the data rate used by the terminal device, for example, due to data conflicts In the case of packet loss, the original rate selection mechanism further reduces the rate, increases the transmission time of a single data packet, and further increases the probability of data collision, which reduces the network performance and fails to improve the reliability and throughput of the network. Reaching the optimization will limit the transmission efficiency of the LoRaWAN network

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