Discovery of sensor web registry services for WSN with Multi-layered SOA framework

Sensor Web Services has potential usage in a wide range of application domain. However due to advancement of OGC SWE standard, there are still challenges left that has to be addressed within the context of discovery of Sensor Web Registry services throughout heterogeneous environment which raises several concerns like performance, reliability, and robustness. Many approaches and frameworks have been proposed to discover the sensor web registry services and some of the approaches assume that the requests are placed in SOAP compatible formats while others focus on GUI based parametric query processing. In this paper an approach has been proposed that uses the Natural Language Query Processing which is a convenient and easy method of sensor data access in comparison to SQL or XML based Query Language like XQuery and XPath. An architecture based on Multi-layered SOA Framework that organizes the method of sensor web registry service discovery in an efficient and structured manner has been suggested by adding some new layers like Request Parser & Query Generator (RPQ), Service Verifier and Certifier (SVC) and Service Rank Calculator (SRC). A typical weather sensor web service discovery where RPQ facilitates the processing of plain text request query to a most appropriate weather sensor web service and also an algorithm with implementation for a complete cycle of suitable sensor web registry service discovery according to requester's functional and QoS requirements has been provided.