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A multiple access method for multi-domain coordination in star wireless sensor networks

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

Active Publication Date: 2021-08-13
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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  • A multiple access method for multi-domain coordination in star wireless sensor networks
  • A multiple access method for multi-domain coordination in star wireless sensor networks
  • A multiple access method for multi-domain coordination in star wireless sensor networks

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Experimental program
Comparison scheme
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 cooperative 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, the sending time interval is 150ms, record the data upload packet loss rate and packet error rate of sensor nodes at the sink node, for the two kinds of 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 ...

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Abstract

The invention discloses a multi-domain coordinated multi-access method for a star-shaped wireless sensor network, comprising: placing a convergence node at the center of sensor nodes in a to-be-monitored area; taking the convergence node as the center, dividing the to-be-monitored area into m Sector, the sensor nodes in each sector are divided into a group; the total frequency band used by the star wireless sensor network is divided into m sub-channels, each sub-channel occupies a frequency band of 125 kHz, with an interval of 25 kHz, and each group located in the same sector The sensor node allocates an independent sub-channel; in each determined group, the sensor node is divided into n layers according to the link quality from the sensor node to the sink node, and each layer of sensor nodes is assigned a different spreading factor; the parameters in the physical layer are the same The sensor nodes of the same group and the same layer adopt carrier sense multiple access, and use the channel occupancy detection mechanism to monitor the channel status, upload data if it is idle, otherwise detect the channel status after a delay, until the data upload is completed when the channel is idle.

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