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Multi-domain cooperative multi-access method for star wireless sensor network

A wireless sensor and access method technology, applied in wireless communication, network topology, electrical components, etc., can solve the problems of wireless sensor network performance degradation, increase in packet loss rate and error rate, waste of communication resources, etc., to achieve increased The effects of large network coverage, reduced interference, and reduced power consumption

Active Publication Date: 2020-08-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) The physical layer parameter configuration of each sensor node in the LoRa wireless sensor network is consistent, and the physical layer parameters of each node cannot be differentiated according to actual needs, resulting in inter-node interference and waste of communication resources.
[0008] (2) When there are a large number of sensor nodes in the LoRa wireless sensor network, multiple nodes will upload data at the same time, causing collisions between nodes, resulting in an increase in packet loss rate and packet error rate, and ultimately the performance of the wireless sensor network will deteriorate

Method used

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  • Multi-domain cooperative multi-access method for star wireless sensor network
  • Multi-domain cooperative multi-access method for star wireless sensor network
  • Multi-domain cooperative multi-access method for star wireless sensor network

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Experimental program
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Effect test

Embodiment 1

[0052] The present invention proposes a multiple access method for multi-domain coordination of star-shaped wireless sensor networks, see figure 1 , including the following steps:

[0053] (1) In the star wireless sensor network, the sink node is placed at the center of the sensor nodes in the area to be monitored, so that the distance between it and each sensor node is within the coverage of the single-hop communication distance; among them, the single-hop communication distance It is a professional technical term in the field, which will not be described in detail in this embodiment of the present invention.

[0054] (2) With the convergence node as the center, the area to be monitored is divided into m sectors, and the sensor nodes in each sector are divided into one group, and the sensor nodes can be divided into m groups, m is an integer greater than or equal to 1, and m is based on The number of sensor nodes p, the sending time interval T, the air transmission time T of...

Embodiment 2

[0091] The present invention provides a multi-access method for multi-domain coordination of a star-shaped wireless sensor network, mainly taking indoor transmission of a LoRa wireless sensor network as an example, including the following steps:

[0092] (1) Firstly, according to the indoor transmission scenario of the LoRa wireless sensor network, the locations of the sink nodes and sensor nodes are determined;

[0093] see Figure 7 , the test scene is located in the laboratory building, the eight sensor nodes S1, S2, S3, S4, S5, S6, S7, and S8 are placed in the corridor respectively, and the sink node is placed in the laboratory in the middle to ensure that each sensor node is Within the single-hop communication distance of the sink node;

[0094] (2) In the embodiment, due to the limitations of the indoor scene and the number of sensor nodes, the sensor nodes are divided into two groups, S1-S4 are grouped into one group, S5-S8 are grouped into one group, and the sink node...

Embodiment 3

[0109] In order to verify the performance of a multi-domain coordinated multiple access method for a star wireless sensor network proposed in the present invention, the embodiment is compared with the random multiple access technology. When the random multiple access technology is used, The frequency points of the eight sensor nodes S1, S2, S3, S4, S5, S6, S7, and S8 are all set to 433MHz, and the spreading factor is set to 7. During the experimental test, the number of sensor nodes under the two methods starts from 1 Gradually increase until 8 sensor nodes are connected to the network, the sensor nodes start to send data randomly, and the sending time interval is 150ms, record the data upload packet loss rate and packet error rate of the sensor nodes at the sink node, for the two access The performance of the method is compared;

[0110] see Figure 8 and Figure 9 , when the random multiple access method is used, as the number of sending nodes increases, the packet loss ra...

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Abstract

The invention discloses a multi-domain cooperative multi-access method for a star wireless sensor network. The method comprises the following steps: placing an aggregation node at the central positionof a sensor node in a to-be-monitored area; taking the aggregation node as a center, dividing the to-be-monitored area into m sectors, and classifying the sensor nodes in each sector into one group;dividing the total frequency band used by the star wireless sensor network into m sub-channels, wherein each sub-channel occupies a frequency band of 125 kHz, the interval of the frequency bands is 25 kHz, and an independent sub-channel is allocated to each group of sensor nodes located in the same sector; in each determined group, dividing the sensor nodes into n layers according to the link quality from the sensor nodes to the aggregation node, and allocating different spreading factors to the sensor nodes of each layer; using carrier sensing multiple access in the same-group same-layer sensor nodes with the same physical layer parameters, sending the channel state through a channel occupation detection mechanism, if the channel state is idle, uploading data, otherwise, detecting the channel state after time delay until the channel is idle so that data uploading is completed.

Description

technical field [0001] The invention relates to the application field of Internet of Things equipment and wireless sensor network technology, in particular to a multi-domain coordinated multiple access method for a star-shaped wireless sensor network. Background technique [0002] A wireless sensor network is a network composed of a large number of randomly distributed low-cost miniature sensor nodes in a self-organized form through wireless communication. It perceives environmental information in a specific area, collects and processes the data, and finally uploads it to the monitoring center to achieve specific area monitoring. unattended monitoring. Wireless sensor networks are widely used, involving environmental monitoring, smart home, medical health, military investigation and other fields. However, due to the limitation of wireless communication technology and application cost, large-scale deployment in commercial applications has not been possible. Early wireless s...

Claims

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Application Information

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IPC IPC(8): H04W40/24H04W40/32H04W24/02H04W72/04H04W84/18
CPCH04W40/24H04W40/32H04W24/02H04W84/18H04W72/53
Inventor 陈为刚贾蒙
Owner TIANJIN UNIV
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