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ELSEVIER Performance Evaluation 20 (1994) 287-300 PERFORMANCE

Summary: ELSEVIER Performance Evaluation 20 (1994) 287-300
Optimization of a database hierarchy for mobility tracking
in a personal communications network
V. Anantharam a,,, M.L. Honig b, U. Madhow b, V.K. Wei b
School of Electrical Engineering, Phillips Hall Cornell University, Ithaca, NY 14853, USA
bBellcore, 445 South Street Morristown, NY 07960, USA
The concept of personal communications is based on the ability of mobile users to maintain communication with
a wireline network (such as the public switched telephone network) by means of a wireless link. Each user has a
unique name (or personal number), and calls are routed to a person rather than to a stationary telephone. In order
to set up such a call, the wireline network has to determine the current location of the user and route the call
accordingly. Keeping track of a mobile user requires updates at databases within the network, and call routing
requires accesses at these databases. In order to reduce the update and access load on each database, a message
routing scheme based on a hierarchy of databases is proposed. We consider the problem of how to assign databases
in this hierarchy so as to minimize the total rate at which accesses and updates occur, given estimates of mobility and
calling rates between cells, and subject to a constraint on the access and update rates for each database. We show


Source: Anantharam, Venkat - Department of Electrical Engineering and Computer Sciences, University of California at Berkeley


Collections: Engineering