Biological signal sensor apparatus, wireless sensor network, and user interface system using biological signal sensor apparatus

A user interface system, comprising:

• a biological signal sensor apparatus, worn on a user's body and serving as a mobile wireless sensor node in a wireless sensor network, for sensing biological signals of a user to generate biological signal data;
• a plurality of stationary wireless sensor nodes, installed in living spaces of the user, for performing wireless communications with the biological signal sensor apparatus;
• a plurality of wireless sink nodes wirelessly connected with the stationary wireless sensor nodes to form the wireless sensor network;
• a service unit for processing the biological signal data transmitted via the wireless sink nodes to provide to the user application services based on location information of the user who stays in any one of the living spaces in the wireless sensor network;
• wherein the service unit includes:
• a sink node connection unit;
• a sink node application program interface unit for providing basic libraries to support communications with the wireless sink nodes;
• a sensor signal processing unit for performing pre-processing on the biological signal data received from the wireless sink nodes;
• a sensor data analysis unit for analyzing patterns of the pre-processed biological signal data by applying a learning or recognizing algorithm thereto;
• a user location management unit for obtaining the location information of the user based on the biological signal data received from the wireless sink nodes;
• an application service unit for providing the application services to the user based on the analyzed biological signal data and the location information of the user;
• and
• a sensor map DB (database) from which a space name of a space where a sensor node is installed and a coordinate of a location of the sensor node are retrieved using a sensor node ID of the sensor node as a key, and the user location management unit obtains the location information of the user by retrieving the sensor map DB using the sensor node ID of the nearby sensor node,
• wherein the biological signal sensor node measures signal strength of a message received from each of the stationary wireless sensor nodes and creates a connection with the stationary wireless sensor node which transmits a message having the highest signal strength, and the biological signal sensor node creates and manages a nearby node table based on the measured signal strength, and
• wherein the nearby node table includes:
• a sensor node ID field storing the sensor node ID of each of the stationary wireless sensor nodes located around the user;
• and
• a wireless signal strength field for storing the signal strength for each of the stationary wireless sensor nodes.