Continuous Top-k region query method in wireless sensor network

Abstract

The invention relates to a continuous Top-k region query method in a wireless sensor network. The method comprises the following steps of: (1) partitioning an entire wireless sensor network monitoring region to form a leaf region and a middle region; (2) acquiring data by all nodes in the leaf region and collecting the data by a cluster head node in the region; (3) collecting the data transmittedby the cluster head node in the leaf region by a cluster head node in the middle region, acquiring the data and collecting all data by a middle cluster head node; (4) performing recursion in turn till a final base station node; (5) judging whether to perform accurate query according to user demand; (6) acquiring a threshold value according to an accurate query result and performing approximate query; (7) transmitting the threshold value to a monitoring region by a base station, and collecting the data and transmitting an average value of the region to the base station by a part of nodes; (8) ordering the received average values of the regions by the base station, selecting and calculating respective error rates of the first Top-k regions; and (9) judging whether the user demand is met according to the error rates. The method can be widely applied to a wireless sensor network environment.

Description

technical field [0001] The invention relates to an area query method, in particular to a query method for continuous Top-k areas (k areas with the highest or lowest values ​​in the wireless sensor network) in a wireless sensor network. Background technique [0002] With the development of microelectronics technology, embedded computing technology and wireless communication technology, the manufacturing level of sensor hardware has also been continuously improved. Low-power, cheap sensor nodes can integrate multiple functions of information collection, data processing and wireless communication in a small volume. . The wireless sensor network is composed of sensor nodes deployed in the monitoring area, which can collect and process the relevant information of the sensing objects to meet various query and information requirements defined by users. Wireless sensor networks have played an important role in various application scenarios such as bird migration, coal mining, and b...

AI Technical Summary

Problems solved by technology

However, it is not necessary to transmit a large number of tuples to the server. This method is not energy efficient and will shorten the life cycle of the network.

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