WLAN-based location systems are implemented in indoor location service in recent years. These systems suffer largely from the signal disturbance under open WLAN environment, which introduces decrease in accuracy and stability of the location service. This paper presents a new algorithm, which utilizes multi-space projections of radio space on sub-level signal spaces to mitigate the influence fr...

Data is always stored in secondary storage Devices due to its volume. When it is stored in secondary storage devices, it is required that the access time is as minimal as possible. Most of the queries issued for providing location based services, result in accessing nearest point. This paper provides an algorithm to store the data efficiently so that accessing time is reduced for answering such...