A method for estimating link quality in wireless sensor networks from a small number of data packets

A wireless sensor network and link quality technology, applied in the field of wireless sensor networks, can solve problems such as curve deviation, difficulty in distinguishing transitional links with different PRRs, "low resolution", etc.

Inactive Publication Date: 2018-02-16
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0005] At present, the existing method of using SNR and LQI to estimate the link quality has the following disadvantages: using a single SNR to estimate the link quality, the SNR changes between 3.4-7.3dB, which can lead to a drastic change in the PRR between 10%-90% Therefore, only using the parameter of signal-to-noise ratio to estimate the link quality has the problem that the "resolution" of the link quality is too low (a small change in SNR will lead to a drastic change in PRR), and it is difficult to distinguish transitional links with different PRRs. Problem: Since the CC2420 only records the received signal strength and LQI of the received data packets, when using SNR, LQI or the average value of the two to estimate the link quality, the recorded SNR and LQI are higher than the actual link, resulting in SNR The ‐PRR curve deviates from the LQI‐PRR curve

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  • A method for estimating link quality in wireless sensor networks from a small number of data packets
  • A method for estimating link quality in wireless sensor networks from a small number of data packets
  • A method for estimating link quality in wireless sensor networks from a small number of data packets

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Embodiment Construction

[0063] The method for estimating the link quality of the wireless sensor network of the present invention includes: statistics of received data packet SNR, LQI and PRR, regression parameter calculation and model selection, link quality estimation and modification of the estimated link quality expression.

[0064] Step 1: Statistics of received packet SNR, LQI and PRR.

[0065] After the positions of the transmitter and receiver are fixed, the transmitter sends StartNum StartTransmitMsg messages with a time interval of t 1 (StartNum≥100, to ensure that the receiver can also receive the message when the link quality between the transmitter and the receiver is poor), the StartTransmitMsg message includes the message sequence number. Next, the transmitter sends m*w data packets with a length of Length without time slots (m can take a smaller value, the typical values ​​of m and w are 20 and 10 respectively, and the typical value of Length is 30 bytes), the data packets time inter...

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Abstract

The invention discloses a method for estimating link quality of a wireless sensor network through a small amount of packets. The method comprises the following steps of receiving statistics on a signal to noise ratio (SNR), a link quality index (LQI) and a packet reception rate (PRR) of each packet; calculating regression parameters and selecting models; modifying an estimated link quality expression after estimating the link quality; giving a specific mode of execution. By means of the method, the packet reception rate in the future can be estimated according to parameters of the small amount of received packets under the environment of dynamic changes of the link quality. In addition, the method has the advantages of being capable of distinguishing different transitional links of the PRR, measuring the SNR and the LQI of the links more accurately and having self-repairing capability, and easy to implement.

Description

technical field [0001] The invention relates to a method for estimating the link quality of a wireless sensor network according to the signal-to-noise ratio, link quality index and packet reception rate of a small number of data packets, and belongs to the technical field of wireless sensor networks. Background technique [0002] In a real environment, affected by factors such as free fading, multipath fading, and shadow fading, the data packet reception rate of wireless sensor networks will vary. Generally, it is divided into stable connection type (data packet reception rate ≥ 90% ), transition type (10%≤data packet reception rate≤90%) and low reception rate type (reception rate is fixed and low), the link quality of a large number of nodes belongs to transition type, and its data packet reception rate (hereinafter referred to as PRR) It varies dynamically between 10%‐90%. [0003] PRR can most directly reflect the link quality. Obtaining PRR requires statistics on the se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/06H04W84/18
CPCH04L43/0823H04W24/06
Inventor 鲁琛
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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