The Analysis and Research of Data Query Processing Technology Based on Wireless Sensor Network System

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Wireless sensor network has a broad application prospect in the national defense military, medical services and traffic control, and other fields. As the power energy of the wireless sensor network is limited, therefore the effective use of energy becomes a core problem in the sensor network query processing. The data query processing technology is analyzed and researched based on the key technology of network system in this paper.Spread the query and data collection for a process, thus reducing power consumption and time dela in data query processing. The introduction Sensor network has a broad application prospect in the national defense military, medical services and traffic control, and other fields.It becomes a research hotspot in recent years.Different from the traditional network, it has many notable features: sensor node computing power, storage capacity and communication ability is very limited. Node data usually contains noise, perception is uncertain: node movement, node dormancy, communication link failure and the surrounding environmental factors, such as sensor network topology changes frequently. The characteristics of sensor networks have made develop its application very difficult.Considering that the sensor network is a data-centric network, main purpose of using it is to query the data of perception or monitor events. Sensor network data management combines embedded data and distributed database technology to effectively manage the sensor data.It provides users with a simple query interface, shielding the complexity of the query processing, can greatly simplify the development of sensor network applications, has become the important supporting software for the development of sensor network applications. The energy of sensor node is supplied by batteries and cannot be replaced, energy is limited.So efficient query processing technology is the core of the sensor network data management system[1-2]. Query processing based on network gather The most simple way is flood type for aggregation in sensor networks. The node will perceive the data sent to the neighbor node in the form of radio.After neighbor nodes receive data, and local data gathered computed locally, then the results are sent to neighbor nodes in the form of broadcast.So the gathered results can be calculated finally in the entire network with the method of the flood type. The energy cost of flood type processing method is very big. It will add unnecessary computing of some nodes. In order to overcome this shortcoming, Someone puts forward various grid gathered method on the premise of saving energy. The methods based on the tree: each node calculates its own layer in the process of establishing tree.The period that is assigned to the two layers to transmit data is called the interval. These intervals should be enough to make a pair of nodes successful completion data transmission, not to suspend the transfer by end of the period. A query delay time of the query result is generated by the length of time interval and tree layers. In order to make the tree adapt to the situation of the network, the node and its neighbors need to control each link quality. In order to save energy, the regulation behaviors frequency is less than the frequency of gathering. When a link occur problems, the node will choose a good point to the link 4th International Conference on Computer, Mechatronics, Control and Electronic Engineering (ICCMCEE 2015) © 2015. The authors Published by Atlantis Press 770 of father node, it can make tree have better robustness. The method based on multipath: this method based on multipath overcomes the shortcoming of low precision based on tree query method. It allows to use any gathered besides tree topology. Multipath gathered don't usually take a long time.This approach is mainly applied to the topology of the ring, because this kind of ring structure provides a good energy efficiency[3-4].It can obviously increase the robustness, because unless each path to the root node link are all broken.Or at least it can find a link to transmit point information to the root node.Because of a node transmitting data to the upper multiple nodes, so it need to obtain the results by adopting repeat gathered profile method.Multipath structure is shown in figure 1.