The method of realizing the specific duty cycle of lora gateway downlink based on conditional probability

Abstract

The invention discloses a method for realizing a specific downlink duty ratio of a LoRa gateway based on conditional probability, and relates to LoRa of a low-power wide area network of the Internet of Things. The method comprises the following steps: 1) obtaining a saturation duty ratio according to initialization parameters; 2) judging whether the terminal actual uplink is successful or not, andif so, adding 1 to the uplink count; 3) judging whether the downlink of the gateway meets the probability p or not; 4) judging whether the gateway downlink is successful or not; 5) updating an uplinksuccess probability Psus and a duty ratio according to an actual system simulation result, and adjusting a probability p to obtain a desired duty ratio requirement; (6) repeating the steps (1)-(5) until the Psus converges to a certain stable value Ps'us; and (7) if the priority is not considered, determining that the probability p obtained in the step (6) is the final downlink transmission probability of the gateway, and if the priority is considered, obtaining data from terminals with different priorities in combination with the priority relationship of the users and the number of the users,and obtaining the conditional probability of downlink transmission of the gateway to each group of users, namely, obtaining the final downlink transmission probability of the gateway of each terminal.

Description

technical field [0001] The invention relates to the LoRa of the low-power wide area network of the Internet of Things, in particular to a method for realizing a specific downlink duty cycle of a LoRa gateway based on conditional probability. Background technique [0002] LoRa, as a representative technology of the low-power wide area network of the Internet of Things, has attracted great attention from all walks of life in recent years, and it will also play a considerable role in the upcoming era of the Internet of Everything. [0003] The technical characteristics of LoRa can be divided into two aspects. First, the physical layer adopts Chirp spread spectrum modulation technology with 6 different spreading factors SF (Spreading Factor). The larger the spreading factor, the longer the transmission distance, and the smaller the spreading factor is. The rate is high, so as to achieve a compromise between rate and distance; second, the MAC layer adopts the ALOHA-based LoRaWAN ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for realizing the specific duty cycle of the LoRa gateway downlink based on the conditional probability, which can realize different downlink priorities of the terminal in view of problems such as the complex coupling relationship between the uplink and the downlink in the prior art.

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