Telefonaktiebolaget Lm Ericsson (publ)

Johanna Karlsson

Hans-Olof Sundell

G&ouml;ran Hall

A cellular communication system supporting packet data communication includes a number of switching arrangements for switching speech and/or circuit switched data. It also includes a number of packet data nodes, each controlling/serving the packet data communication in a number of packet paging areas. In each cell, a number of packet data communication channel resources are used for packet data communication, and each packet data node includes mobile station information handling devices keeping information about mobile stations registered in the cells covered by the packet data node. Cell information handling devices are further provided keeping information about packet data communication channel resources in the cells covered by the packet data node. Devices are provided for calculating which packet data communication channels are to be used for mobile stations after updating of a cell. Furthermore, devices are provided for keeping information about which cells have been updated and when a cell is updated. Paging of a mobile station in a stand-by state is performed by sending a number of first paging messages from the packet data node using the calculated packet data communication channel resources in all cells within the packet paging area in which the mobile station is registered. If the mobile station is not found, a second paging message is sent out to all cells which have been updated, advantageously on all packet data communication channel resources of such cells.

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Mölndal, Sweden

Johanna Karlsson