Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1996-10-08
1999-03-30
Hsu, Alpus H.
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370338, 370349, 455433, 455440, 455456, H04Q 722
Patent
active
058897704
DESCRIPTION:
BRIEF SUMMARY
This application is the national phase of international application PCT/Fl95/00191 filed Apr. 6, 1995 which designated the U.S.
FIELD OF THE INVENTION
The present invention relates to a location management method for packet data transmission in a mobile communication system between a mobile station and a data service center establishing an interface to a data network, the method comprising the maintenance and updating of location data of the mobile station in a subscriber database of the cellular network in accordance with the location area configuration employed in the cellular network.
BACKGROUND OF THE INVENTION
In cellular radio systems, which are generally referred to as mobile communication systems herein, the geographical area covered by the system is divided into smaller radio areas, i.e. radio cells, to make the utilization of the frequency band of the system more efficient. Mobile radio stations, i.e. mobile stations, may freely move from a cell to another within the system area. In order that mobile-terminating calls and signalling can be routed to the correct location in a cellular radio network, the cellular radio network maintains the location data of mobile stations in the subscriber databases of the cellular radio network.
Typically, a cellular radio network knows the location of mobile stations with an accuracy of a so-called location area, which consists of one or more cells, (By this, it is meant that the cellular radio network knows which location area each mobile station is located in, but not necessarily in which cell within a location area each mobile station is located.) i.e. a group of cells. The location data of a mobile station in subscriber databases is updated only if the mobile station moves from a location area into another. This type of location updating based on a location area is a compromise between location updating carried out in each cell and PLMN-based (Public Land Mobile Network) location updating. The disadvantage of PLMN-based location updating is that in a case of a mobile-terminating call, the paging message is transmitted in all cells within the PLMN. Furthermore, all paging messages are repeated, for instance three times, to increase the probability of reception. This manner of proceeding consumes the frequency band. In a case where location updating takes place in connection with every cell crossover, there is a significant increase in the number of location updating messages. This consumes the capacity of the radio path, and the need for data processing in mobile services switching centers and base station controllers also increases.
The location updating and location management based on location areas operate in a satisfactory manner in conventional networks.
Finnish Patent Applications 933,894 and 940,314, which are unpublished on Apr. 8, 1994, disclose new packet data transfer modes between a mobile station and a special data service center. The packet service center produces an interworking function between the cellular radio network and a separate data network. Data packets are transmitted between a mobile station capable of data transmission and the packet service unit by using a so-called virtual connection. In this case, 1) a circuit-switched connection through the cellular network is only established for the period of time required for transmitting a single packet or 2) packets are transferred through the cellular radio network on the basis of the address on a data packet according to the node-to-node scheme entirely without a circuit-switched connection by using the network elements of the cellular network as nodes.
In the first case, described in Finnish Patent Application 933,894, the data service center informs a mobile station, via a common downlink paging channel, of an incoming data packet transmission, as a result of which the mobile station initiates the establishment of a circuit-switched connection in the network by using call set-up data associated with the virtual connection. When the packet transmission has been completed, the cir
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Hamalainen Jari
Jokiaho Timo
Rajala Jussi
Rautiola Markku
Hsu Alpus H.
Nokia Telecommunicaitons Oy
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