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Hierarchical LR scheme

Hierarchical LR scheme

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Hierarchical LR scheme

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  1. Hierarchical LR scheme • See my paper with Gopal Dommety on general mobile location management

  2. Register (hierarchy limits level to which this is needed) Register (needed if first appearance at this Level S LD) Cancel Register Register Register Register New visiting Switch Variants of overlay approach: move operation Level S location database S = 1 ... L Level S location database Level L-1 location database Level L-1 location database Level L location database (also home location database) Level L location database Level L location database Level L location database Visiting Switch Home Switch Home location database tracks Sth level location database of mobile

  3. Find Find Find Find Find Variants of overlay approach:find operation Level S location database Level S location database Level L-1 location database Level L-1 location database Level L location database (also home location database) Level L location database Level L location database Level L location database Visiting Switch Home Switch Originating Switch Other Switch Other Switch

  4. Attributes • If S = L, then it means there are only VLRs and HLRs – cellular scheme • If S = 1, then a full tree structure – don’t need concept of home location databases • Tree structure limits registration propagation as well as find propagation • Need to cancel at old sub-tree during move