Link quality estimator with signal-to-noise ratio, chain quality index and packet receiving rate fused

Abstract

The invention discloses a link quality estimator with the signal-to-noise ratio, the chain quality index and the packet receiving rate fused, and belongs to the technical field of wireless sensing networks. A link quality estimator applying a collection tree protocol has the following defects that the great influence, on the packet receiving rate, of the packet length is not considered; statistics of a great number of data packets is needed to estimate the link quality; further improvement of the energy efficiency is needed. To overcome the defects, the link quality estimator with the signal-to-noise ratio, the chain quality index and the packet receiving rate fused is designed, and the link quality estimator includes link quality expression fitting, packet design and updating of items of neighbor tables. The link quality estimator has the advantages that high-resolution link quality estimation can be conducted just by conducting statistics on a small amount of packets (less than 10), the totally-same length is adopted for all the packets, the link quality estimating can reach quick change of the link quality, and the estimator is high in energy efficiency.

Description

technical field [0001] The invention relates to a link quality estimator integrating signal-to-noise ratio, link quality index and packet receiving rate, and belongs to the technical field of wireless sensor networks. Background technique [0002] Due to the limited transmission and reception power of wireless signals, the link quality must be estimated in wireless sensor networks. Therefore, the link quality estimator is an indispensable part of wireless sensor networks, which directly affects the accuracy of routing selection and communication protocols. energy efficiency. [0003] At present, the collection tree protocol (hereinafter referred to as CTP) is a commonly used protocol in research at home and abroad. In the collection tree protocol, data packets and routing beacon packets are sent or received between nodes. The protocol consists of the following three parts: ① The routing engine is responsible for Send routing beacons, update routes, prevent routing loops, an...

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Problems solved by technology

[0005] However, the link quality estimator of the collection tree protocol has the following disadvantages: 1. in the link quality estimator of the collection tree protocol, the number of data packets, routing beacons or new response packets used to count the reception rate (hereinafter referred to as PRR) The lengths are different, and the receiving rate of the package is greatly affected by the length of the package. In the case of other conditions being the same, the receiving rate of the large-length package is much lower than that of the small-length package. Therefore, the link quality of CTP There is a problem in the method for the estimator to update the link quality parameters of data packets by counting the reception of routing beacon packets; The statistical method obtains the PRR, and then calculates the ETX. Therefore, when the statistical data packets and routing beacon packets are small, this method has the disadvantage of estimating the PRR with too low accuracy (for example, if 10 packets are counted, 1 packet Statistics or not will cause 10% error to the statistical results), and when there are many statistical data packets and routing beacon packets, this method is too slow in estimating the PRR (because a large number of packets need to be counted), which leads to The link quality estimator cannot track the shortcoming of the rapid change of the link quality, which is a dilemma; ③ the link quality estimator of the acquisition tree protocol does not consider the essential factors affecting the link, such as the link quality index (hereinafter referred to as LQI ) and signal-to-noise ratio (hereinafter referred to as SNR), etc., so the accuracy of its link quality estimation is doubtful, which will undoubtedly affect the energy efficiency of the link quality estimator

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