Abstract
This paper presents two mobile location management algorithms for ATM (asynchronous transfer mode) networks based on the PNNI (private network-to-network interface) standard. The first solution, referred to as the mobile PNNI scheme, builds on the PNNI routing protocol by using limited-scope (characterized by a parameter S) reachability updates, forwarding pointers and a route optimization procedure. The second solution, referred to as the LR (location registers) scheme, introduces location registers (such as the cellular home and visitor location registers) into the PNNI standards-based hierarchical networks. This scheme uses a hierarchical arrangement of location registers with the hierarchy limited to a certain level S. A comparison of the two schemes indicates that at low CMRs (call-to-mobility ratios), the LR scheme incurs a lower average total cost (consisting of the average move and average search costs) than the mobile PNNI scheme, while at high CMRs, the mobile PNNI scheme incurs a lower cost.
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