wireless sensor network MAC (Medium Access Control) protocol realization method based on LoRa (Long Range)

Abstract

The invention provides a wireless sensor network MAC (Medium Access Control) protocol realization method based on LoRa (Long Range), so as to solve the technical problems of small network capacity, large power consumption and not strong scalability existing in the wireless sensor network MAC protocol in the prior art. The realization method comprises steps: a LoRa star-type wireless sensor network is firstly built; then, a gateway node divides all terminal nodes into multiple groups according to distances between the gateway node and different terminal nodes in the network, and according to a working sequence, each divided group is sequentially divided into a broadcasting time period, a synchronization time period, a data interaction time period and a reserved time period; and finally, the gateway node transmits broadcasting signals in the broadcasting time period to detect whether to-be-added terminal nodes exist, transmits a beacon frame comprising a synchronization time and slot allocation scheme in the synchronization time period, and communicates with awakened terminal nodes in the data interaction time period. The method of the invention can be used for long-range communication between multiple terminal nodes and the gateway nodes in the LoRa star-type wireless sensor network.

Description

technical field [0001] The invention belongs to the technical field of communication, relates to a method for realizing a wireless sensor network MAC protocol, in particular to a method for realizing a LoRa-based wireless sensor network MAC protocol, which can be used for multiple terminal nodes and gateways in a LoRa star wireless sensor network Long-distance communication of nodes. Background technique [0002] LoRa (Long Range) technology is a long-distance wireless spread spectrum modulation technology with strong anti-interference performance and can minimize current consumption. It has great flexibility, users can decide the spread spectrum modulation bandwidth BW (7.8 ~ 500kHz), spreading factor SF (6 ~ 12) and coding rate CR (4 / 5, 4 / 6, 4 / 7, 4 / 8), covering all available frequency bands, and each spreading factor is orthogonally distributed, multiple transmission signals can occupy the same channel without interfering with each other. The LoRa wireless module is a w...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects in the above-mentioned prior art, and proposes a method for realizing the MAC protocol of wireless sensor network based on LoRa, which is used to solve the problem that the existing wireless sensor network MAC protocol has less network capacity and lower power consumption. Large and not very scalable technical issues

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