Design and Implementation of a Scalable LBS Middleware Based on the PUBSUB Paradigm and Load Balancing Mechanism

This paper presents a LBS middleware software, which contains application and positioning modules. The first module is designed to improve the granularity of the pushed information in current LBS systems and to conveniently add new applications. Taking the advantage of PUB/SUB system´s asynchronous, loosely-coupled and multiplex communication mechanism, the middleware pushes LBS information with its granularity refined. By combining position information and the PUB/SUB paradigm, users can easily focus on his points of interest. Positioning module enables the system of handling both indoor and outdoor scenario. And the system can easily add new indoor positioning server and dispatch work load to them judging by their current work load. Experimental results showed that the middleware can offer an efficient service to users and system performance can be improved under massive requests.