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This paper presents the Ubiquitous Sensor Network (USN) testbed, which is deployed at Electronics and Telecommunications Research Institute (ETRI), in Republic of Korea. USN testbed is a state-of-the-art sensor network experimental facility composed of various components. It includes heterogeneous sensor nodes with variety of sensing module ranging from ultralow power to high performance hardware platforms, a scalable and reliable Ethernet based wired backplane network to program, interact with and receive/send data from/to the sensor nodes, an easily extendable application software suite which glues and drive everything in a user friendly manner, and an indoor and outdoor deployment space offering various environmental characteristics. We also included two case studies where researchers have put USN testbed into practice for experimental evaluation of algorithms and networking protocols. The case studies cover routing and clustering protocol in wireless sensor networks.

The configuration of the u-sensor network is comprised of sink node, and the sensor node and gateway so that the USN(Ubiquitous Sensor Network) application service can be provided. The middlewarefunction needfor a sink and sensor node for the sensor network management. In the middlewarefunction, it is required of the network topology management, the sensing data processing, a failure and power management, and etc. And it is designed in order to perform the network management through the u-sensor network overall. In this paper, it described about the design about the topology, event data, failure, power management for a sink and sensor node management and implementation issue. The topology configuration and all kinds of management data of sensor network nodes were shown through an implementation in the PAN network management GUI(Graphical User Interface).Keywords -Sensor Network, Management. resource specification of the sensor node, the expandability of the sensor network and heterogeneity of the sensor nodes and etc. about sensing data and the wireless network technique for accurately transmitting sensing data with the energy efficiency it is quick it uses the radio communications are needed. Moreover, the sensor network management technique including the movement, addition, omission, resources state and function change of the sensor node, and etc. is required. Generally, the most of USN middlewares and sensor network middleware are comprised of the Tightly-coupled system in order to provide the good performance concerning the USN application service. In this paper, a requirement and the function required for the sensor network middleware were defined. It was put through an implementation and described about the display of the management system of the u-sensor network.

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This paper proposes a sensor data compression mechanism based on the amount of change of sensor input data and a power management scheme for various sensors used for the motion recognition application. The experimental results confirmed that the proposed compression mechanism and power management scheme reduced the wakeup count of the sensor hub core and the amount of data transmitted to the core by about 78% compared to the conventional data buffering structure, and the power consumption of the IMU (inertial measurement unit) is reduced by about 56%.