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Location updating in a cellular radio system
| Details |
Inventors: Laatu, Juho;
Assignee: Nokia Telecommunications Oy (Espoo, FI)
Primary Examiner: Vo; Nguyen
Assistant Examiner:
Attorney, Agent or Firm: IP Group of Pillsbury Madison & Sutro LLP
The invention relates to a cellular radio network and a method for performing location updating in a cellular radio system. The cellular radio network does not employ fixed location areas, as prior cellular radio networks do, but it employs a location area configuration which is subscriber station specific and dynamically adaptive. In connection with each location updating, it is therefore possible to select an optimal location area for the subscriber station at that particular moment, the selected location area being preferably of an arbitrary size and form. It is thus possible to define the location area subscriber station specifically in such a manner that, on one hand, it is sufficiently large so that the subscriber station does not have to perform location updating frequently but, on the other hand, sufficiently small so that the paging of the subscriber station does not load the cellular radio network too much. The network and method also allow the use of completely subscriber station specific location areas. |
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DETAILED DESCRIPTION An object of the present invention is a cellular radio network in which the signalling load caused by both the paging of a subscriber and location updating is reduced.
This is achieved in a cellular radio network in which each cell broadcasts one or more location area identifiers or an identifier suitable for use as such and which comprises mobile subscriber equipments capable of roaming in such a manner that location data of the mobile subscriber equipments are stored in the cellular radio network with an accuracy of a location area, consisting of one or more cells.
According to the invention, the cellular radio network has a location area configuration which is subscriber equipment specific and dynamically adaptive.
A further object of the invention is a method for performing location updating in a cellular radio system, comprising the steps of storing information on the location of a mobile subscriber equipment with an accuracy of a location area, consisting of one or more cells, broadcasting in each cell one or more location area identifiers or an identifier suitable for use as such, updating the information on the location of the subscriber equipment at least when the subscriber equipment moves to a cell the location area identifier broadcast cast by which does not belong to the location area defined by the present stored location data of the subscriber equipment.
The method of the invention is characterized by employing a dynamic location area configuration in such a manner that a new location area of a suitable size is selected or formed for the mobile subscriber equipment according to a certain criterion, selecting or forming a name for the new location area in such a manner that it includes a location area identifier of each cell belonging to the location area, storing the new name of the location area as location data of the mobile subscriber equipment, and informing the mobile subscriber equipment of the new location area.
The cellular radio network of the invention is not divided into fixed location areas as in prior cellular radio networks, but it employs a location area configuration which is subscriber station specific and dynamically adaptive
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Ring Tones 
