Method and means for providing enhanced subscriber identity confidentiality during roming in a cellular radio communication system
First Claim
1. A node in a radio communication system, where said system includes at least a first and a second core network node (203-205) that are arranged in a first pool of core network nodes (201), and where said first pool of core network nodes (201) is arranged to support mobile stations in a first service area (311), characterised in that said node (301) includes means (501, 502) for acting as said first core network node towards a third core network node (303) arranged outside of said first pool of core network nodes (201) if a first mobile station (312), that is registered in said first core network node (203), roams from said first service area (311) into a second service area (302) supported by said third core network node (303).
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Accused Products
Abstract
The present invention relates to a method and means for roaming in a cellular radio communication system with a pool of core network nodes, e.g. an MSC-pool (201). A Subscriber Identification Service Node (SISN) is used to handle roaming from a service area supported by a previous MSC/VLR (205) in the MSC-pool to a service area supported by a new MSC/VLR (303) arranged outside of the MSC-pool. The SISN (301) receives an identity request from the new MSC/VLR (303) and forwards it to the previous MSC/VLR (205). The SISN receives a response from the previous MSC/VLR and relays it to the new MSC/VLR. This means that the SISN helps the new MSC/VLR (303) to retrieve data from the right MSC/VLR within the MSC-pool (201).
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Citations
21 Claims
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1. A node in a radio communication system, where said system includes at least a first and a second core network node (203-205) that are arranged in a first pool of core network nodes (201), and where said first pool of core network nodes (201) is arranged to support mobile stations in a first service area (311),
characterised in that said node (301) includes means (501, 502) for acting as said first core network node towards a third core network node (303) arranged outside of said first pool of core network nodes (201) if a first mobile station (312), that is registered in said first core network node (203), roams from said first service area (311) into a second service area (302) supported by said third core network node (303).
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13. A method of roaming in a radio communication system where said system includes at least a first and a second core network node (203-205) that are arranged in a first pool of core network nodes (201), wherein said first pool of core network nodes (201) is arranged to support mobile stations in a first service area (311), and where said system also includes a third core network node (303) that is arranged to support mobile stations in a second service area (302), and where a mobile station, that is moving from said first service area (311) into said second service area (302), has made contact (601) with said third core network node, characterised in the following steps:
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transmitting (603), from said third core network node (303) to a pre-determined node (301), a request for specific information that are stored in said first core network node (203-205);
obtaining (604-606), in said pre-determined node (301), said specific information from said first core network node (203-205); and
forwarding (607) said specific information in said pre-determined node (301) to said third core network node (303). - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification