Reliability-based LoRaWAN network spread factor allocation method

A technology of spreading factor and distribution method, which is applied in the field of spreading factor distribution of LoRaWAN network based on reliability, can solve the problems of different collision probability at different rates, node power consumption affecting network stability, and large difference in channel occupancy time.

Inactive Publication Date: 2019-03-26
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the rates of different spread spectrum channels are very different. When transmitting data of the same length, the channel occupation time is also very different.
If only the same number of nodes are allocated for different spreading factors, different rates of collision probabilities will be different, resulting in unfair transmission
This unfairness will lead to low rate (high spreading factor) causing a large number of packet loss due to higher collision probability, affecting network stability and increasing node power consumption due to repeated retransmission , so it is very meaningful to study the allocation strategy of the spreading factor

Method used

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  • Reliability-based LoRaWAN network spread factor allocation method
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  • Reliability-based LoRaWAN network spread factor allocation method

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Embodiment Construction

[0057] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0058] as in the present invention figure 1 As shown in the overall structure diagram of the system, it is mainly divided into the following steps: S1: According to the receiving sensitivity threshold and path loss characteristics of the LoRa node, construct the path loss packet loss model, initialize the spreading factor of each node, and obtain the initial ratio set M of the spreading factor init ;S2: Based on the characteristics of LoRa data transmission and introducing the proportion of spreading factor P s , establish data transmission success rate, spreading factor and P s S3: Based on the relationship model of S2, an optimized spreading factor allocation strategy is established to obtain an optimized spreading factor ratio set M fair ; S4: Combining the proportion sets obtained by S1 and S3, the LoRa-FDF strategy is used to adjust ...

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Abstract

The invention relates to a reliability-based LoRaWAN network spread factor allocation method, belonging to the wireless technical field of low power wide area network. The method comprises the following steps: constructing a path loss packet loss model according to a receiving sensitivity threshold and path loss characteristics of LoRa nodes, initializing the spreading factors of each node, and obtaining an initial ratio set Minit of the spreading factors; secondly, analyzing transmission characteristics of the LoRa data, introducing a spreading factor ratio Ps, establishing a relationship model between data transmission success rate, the spreading factors and the Ps, and determining a optimized spreading factor ratio set Mfair; finally, adjusting the spreading factors of different nodes according to the Mfair using an LoRa-FDF strategy, thereby improving the data transmission success rate, and increasing the 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 method for allocating spreading factors of a LoRaWAN network based on reliability. 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 communication distance. 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. According to the characteristics of LoRa, when the bandwidth and code rate are constant, the transmission rate of LoRa is determined by the spr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/02H04B1/69
CPCH04B1/69H04W24/02Y02D30/70
Inventor 谢昊飞黄代维王平丁凡袁兴未
Owner CHONGQING UNIV OF POSTS & TELECOMM
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