Hierarchical Location Caching Scheme for Mobile Object Tracking in the Internet of Things

Mobility arises naturally in the Internet of Things networks, since the location of mobile objects, e.g., mobileagents, mobile software, mobile things, or users with wireless hardware, changes as they move. Tracking theircurrent location is essential to mobile computing. To overcome the scalability problem, hierarchicalarchitectures of location databases have been proposed. When location updates and lookups for mobileobjects are localized, these architectures become effective. However, the network signaling costs and theexecution number of database operations increase particularly when the scale of the architectures and thenumbers of databases becomes large to accommodate a great number of objects. This disadvantage can bealleviated by a location caching scheme which exploits the spatial and temporal locality in location lookup. Inthis paper, we propose a hierarchical location caching scheme, which acclimates the existing location cachingscheme to a hierarchical architecture of location databases. The performance analysis indicates that theadjustment of such thresholds has an impact on cost reduction in the proposed scheme. KCI Citation Count: 1