A proxy based dynamic data management using hierarchical database for location based services

Abstract

Location dependant data are becoming very popular in mobile environments. To improve system performance and facilitates QoS several methods like location aware proxies, caching etc. are being used. Based on the classification of different query models and data, we propose an architecture with hierarchical service database for effective location based services to reduce the network cost with required quality of service (QoS). In our paper, a hierarchical database structure with collocated proxy is proposed to facilitate location based service delivery for both location dependant and independent data to the clients. A mobile user communicates with the proxy that is attached with the local (server) database of the cell, which routes the query to the appropriate level of the hierarchical database structure, based on the query type and location of the target object. A database update method has also been proposed based on the update frequency and access characteristics of data objects. We devise a general architecture and cost model for servicing location dependant and independent data, to reduce the network cost by maintaining quality of service and improve response time under changing user mobility and access patterns. Further when the mobile user engaged in multiple services, the per-service proxies can be employed to further improve the access time.