An Enhanced Location - Based Location Update Scheme in Mobile Cellular Networks

Effective location tracking strategy is essential to improve the utility of radio channels [1]-[6]. Due to the limited battery life and computational capacity in a mobile station (MS), one desirable feature of a location update scheme is its easy implementation in the MS. A movement-based location update scheme [4] is one of the easily implementable approaches. According to this scheme, each MS maintains a counter, whose value is compared to a movement threshold to trigger a location update. The MS performs a location update when the number of cells visited by the MS exceeds movement threshold T. In this scheme, however, the MS increases its counter value even when the MS reenters a cell previously visited, which triggers an unnecessary location update. To overcome this deficiency, an improved movement-based location update scheme [5] and a location-based location update (LU) scheme [6] were proposed. Among them, we consider the LU scheme, which is evaluated to be superior to the improved