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KMID : 0950020070330010039
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Journal of Health Science & Medical Technology
2007 Volume.33 No. 1 p.39 ~ p.52
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Location Management Algorithm for ATM networks based on the PNNI Standard
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Lee Tae-Ro
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Abstract
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This paper presents mobile location management algorithm for ATM(Asynchronous Transfer Mode) networks based on the PNNI (Private Network to Network Interface) standard. It uses limited scope reachability updates, forwarding pointers and a route optimization procedure. PNNI standard-based on ATM networks are arranged in hierarchical peer group and nodes within a peer group exchange detailed PTSP’s(PNNI topology state packets), and hence have complete information of the peer group topology and loading conditions. Mobile endpoints can be supported in the PNNI hierarchical architecture. Mobiles are located at base stations, which are assumed to be organized as in cellular networks, with multiple base stations connected to each switch.
The major results of this study were as follows :
1. If the calling party is in the mobil’s neighborhood or the mobile is in its home neighborhood, the call is routed directly to the mobile. So we can reduce the communication traffic from home to current location of mobile.
2. If the call arrives at a switch before it is updated with the correct reachability information about the mobile, the call is routed from the old location to new location using forwarding pointers.
3. User data are switched over from the old path to the new path using “tail” signals and buffering to perform this action without loss of cell sequence.
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KEYWORD
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Location Management, Wireless ATM, Mobility Management, Hand off
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