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An adaptive rate adjustment method based on network conditions for lpwan internet of things

A network status and rate adjustment technology, applied in the direction of network traffic/resource management, advanced technology, climate sustainability, etc., can solve problems such as uneven load distribution, failure to consider SF sub-channel utilization, packet loss, etc., to avoid Effects of packet loss, network access capability improvement, and flexible rate control

Active Publication Date: 2020-11-20
中兴克拉科技(苏州)有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the utilization of SF sub-channels is not considered as a whole, and the load distribution is uneven. If all of them are congested to one SF sub-channel, packet loss will occur.

Method used

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  • An adaptive rate adjustment method based on network conditions for lpwan internet of things
  • An adaptive rate adjustment method based on network conditions for lpwan internet of things
  • An adaptive rate adjustment method based on network conditions for lpwan internet of things

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with accompanying drawing:

[0048]A kind of LPWAN Internet of Things adaptive rate adjustment method based on network conditions, is characterized in that, comprises the steps:

[0049] Process 1. Receive the uplink frame sent by the LoRa terminal;

[0050] Process 2, 101 samples the SNR and RSSI values ​​of the latest N frames, N≥10;

[0051] Process three, 102 counts the packet loss rate according to the continuity of the frame sequence number;

[0052] Process 4, 103 counting the load erl of the SF sub-channel according to the channel occupied by the terminal and the SF used;

[0053] Process five, 104 weighted calculation of terminal expected data rate DR according to the weight of each frame of data mote ; When the terminal statistical packet loss rate exceeds the packet loss threshold in the ADR policy, enter process six; when the terminal statistical packet loss rate does not exceed the pack...

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Abstract

The invention is intended to provide an adaptive rate adjustment method of an LPWAN internet of things based on a network condition. The adaptive rate adjustment method comprises the steps of receiving uplink frames sent by a terminal; sampling SNR and RSSI values of latest N frames; making a statistics of a packet loss rate according to continuity of frame serial numbers; making a statistics of loads erl of SF (Spread Factor) sub-channels according to occupied channels and used SFs of the terminal; weighting to calculate an expected DR (Data Rate) <mote> of the terminal; when the packet lossrate of the terminal exceeds a packet loss threshold value in an ADR (Adaptive Data Rate) strategy, performing packet loss rate adjustment; when the packet loss rate of the terminal does not exceed the packet loss threshold value in the ADR strategy, performing normal rate adjustment; sending an ADR command to the terminal, and enabling the terminal to adjust a data transmission rate according toan own strategy after receiving the ADR command and make a response; and if a LoRaWAN server does not receive the response, considering that the sending is failed, and repeating to send till the response is received. The adaptive rate adjustment method has the following beneficial effects: the adaptive adjustment can be performed on the data rate of the terminal according to an own network condition including conditions such as a signal quality index, a channel load and the packet loss rate.

Description

technical field [0001] The invention relates to an adaptive rate adjustment method for LPWAN Internet of Things based on network conditions, and belongs to the field of LPWAN Internet of Things. Background technique [0002] LoRaWAN is a low-power wireless wide-area Internet of Things (LPWAN) built using Semtech's LoRa technology. Due to its low power consumption, low cost, and long transmission distance, it can be widely used in various occasions for long-distance low-speed IoT. Networked wireless communication fields, such as automatic meter reading, municipal facility monitoring, environmental monitoring, wireless security, industrial monitoring and control, etc. [0003] LoRa adopts spread spectrum modulation technology, and each channel supports 6-level spread factor (Spread Factor, SF), from SF7 to SF12, corresponding to different data rates, from DR5 (Data Rate5: corresponding to SF7) to DR0 (Data Rate0: Corresponds to SF12). The larger the spreading factor, the str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W28/02
CPCH04W28/02H04W28/0231H04W28/0236Y02D30/70
Inventor 白平在周宇翔
Owner 中兴克拉科技(苏州)有限公司
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