Method for acquiring information by sink node in wireless sensor network when moving

Abstract

The invention discloses a method for acquiring information by a sink node in a wireless sensor network when moving, which comprises the following steps: establishing a two-layer grid in a whole network; executing hierarchical monitoring based on the two-layer grid; performing event-driven or query-driven monitoring application on events of interest in an environment respectively; when a sink moves, reselecting a direct proxy and a master proxy by a proxy mechanism in order to ensure that the sink can continuously collect data from the node of an event source or a query source. The operating steps comprise initializing, grid establishing, proxy mechanism establishing, monitoring hierarchically or querying, and continuing to execute each stage of the event-driven or query-driven monitoring application after reselecting the direct proxy and the master proxy by the proxy mechanism when the sink moves. The method for acquiring the information by the sink node in the wireless sensor network is suitable for the sensor network which aims at environmental monitoring and has densely-disposed nodes and large scale, and solves the problems of incapability of acquiring information by the sink in a moving state, great energy consumption in a TTDD routing protocol, poor capability of monitoring a sudden event and the like.

Description

technical field [0001] The invention relates to a new technology of a wireless sensor network, more precisely, relates to a method for collecting information when a sink node in a wireless sensor network moves, and belongs to the technical field of wireless self-organizing network systems. Background technique [0002] Wireless sensor networks (WSNs) are multi-hop networks composed of a large number of sensor nodes for collecting information related to the physical space environment. The main purpose of its routing protocol is to ensure that the sensing data can be correctly transmitted to the gateway node in the sensor network, that is, the sink node. Sink is a device responsible for wireless communication with each sensor node in a wireless sensor network, and at the same time using other communication methods to access an external bus or network for information exchange. Sink can be a fixed device or a mobile terminal, such as a notebook, PDA or mobile phone. WSNs routi...

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Problems solved by technology

[0009] In view of this, the object of the present invention is to provide a method for collecting information when the sink node in a wireless sensor network moves, which is suitable for sensor networks with dense node deployment and large scale for the purpose of environmental monitoring. It solves the problem of how to collect information when the sink is in the mobile state, and also solves various problems in the TTDD routing protocol, such as large energy consumption and poor ability to monitor emergencies

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