LPWAN synchronous awakening mechanism based on LoRa

Abstract

The invention discloses an LPWAN synchronous awakening mechanism based on LoRa. The LPWAN synchronous awakening mechanism comprises the steps that S1, a beacon frame is sent; S2, clock synchronizationis carried out; S3, a service equal-length time slot Tw is divided on the basis of a beacon frame sending interval; S4, service time slot synchronization is carried out, and awakening is performed atfixed time Tw to receive an awakening frame at the arrival of the delay time; S5, a sensing node is awakened at regular time to receive downlink data according to the beacon frame sending starting time and the service period interval; S6, the sensing node changes the synchronous time calibration period according to the RTC error calibration condition; and S7, the sensing node increases the Tg time in order to solve the sending conflict between the beacon frame and a downlink frame of the server. According to the invention, the clock tick of a gateway in the network is ensured to be consistentwith that of the sensing node, so that the gateway can predict the timing awakening windowing receiving moments of all sensing nodes; and on the premise of meeting the low-power-consumption design requirement, the clock tick can be divided and dynamically adjusted in order not to influence downlink transmission delay.

Description

technical field [0001] The invention belongs to the technical field of communication processing, and in particular relates to a LoRa-based LPWAN synchronous wake-up mechanism. Background technique [0002] With the rapid development of the Internet of Things technology, how to connect everything simply, quickly and safely has always been a technical problem faced by many smart terminal products. The emergence of LoRa-based LPWAN communication technology has solved the shortcoming of insufficient mobile cellular network carrying capacity. At present, the application scenarios of LoRa mainly include data transparent transmission and LoRaWAN protocol applications. Due to the high R&D cost of the gateway SX1301, the LoRaWAN protocol Applications are small. In order to meet the needs of small-scale networking, it is obviously not suitable to use SX1301, but a gateway is needed to realize ad hoc networking. A star or mesh network using point-to-point transmission is a new applica...

AI Technical Summary

Problems solved by technology

[0009] All sensing nodes use a fixed timed wake-up cycle, the gateway sends N wake-up frames continuously, and the time of continuous sending covers the time of terminal sleep wake-up, so that each node can be woken up at least within 2 wake-up cycles, and the timed wake-up cycle If it is too short, it will affect the power consumption of the system, if it is too long, it will affect the downlink response speed, and other sensing nodes will be awakened by mistake during unicast, which is not the optimal solution