Patent ID: 7243164

Claim:
A client-server based information or service system for providing location dependent information or services to operating mobile clients, said systems comprising: a plurality of stationary servers arranged at levels in a hierarchical ordered tree shaped network, said hierarchical ordered network levels being arranged to include at least an uppermost root level and a lowermost leaf level, and optionally an intermediate branch level, wherein each of said servers are arranged to provide information or services corresponding to a predefined specific geographical area, said geographical area being non-overlapping with respect to geographical areas corresponding to adjacent servers on the same network hierarchy level, said geographical area being subdividable to comprise geographical areas corresponding to servers on lower network hierarchy levels, and said operating mobile client having an association with only one of said servers at a time, the association being transferable between adjacent servers of the tree shaped network on an existing connection of a client to the network, whereby a mobile client user obtains automatically or on user request information or services of interest pertaining to the specific geographical area of the corresponding server with which the mobile client currently has an association.