Routing area updating in packet radio network
First Claim
1. A method for updating a routing area in a packet radio network, the method comprisingestablishing a logical link between a mobile station and a first radio support node via a radio cell, selecting a second radio cell in the mobile station, the routing area identifier broadcast by the cell being different from the routing area identifier of the first radio cell, sending a routing area update request to the second packet radio support node serving the second cell from the mobile station, detecting in the second packet radio support node that the mobile station has roamed from a routing area served by a different packet radio support node, requesting subscriber data related to the mobile station from the first packet radio support node, sending an acknowledgement message on the routing area update from the second packet radio support node to the mobile station, sending information on the change of the packet radio support node from the second packet radio support node to the mobile station, and initiating a local procedure or a network procedure for initializing a logical link between the mobile station and the second packet radio support node in the mobile station in response to the reception of said information.
4 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a cellular packet radio. network and to a method for updating a routing area in a packet radio network. Packet radio support nodes (SGSN) are connected to a digital cellular radio network (BSS), which provides a radio interface for the support nodes for packet-switched data transmission between the support nodes and mobile stations. There is a logical link between a mobile station (MS) and a serving packet radio support node (SGSN). The packet radio network utilizes logical routing areas, each of which comprises one or more cells. Each cell broadcasts information on the routing area to which it belongs. The mobile station sends a routing area update request to the packet radio network when it roams to a new cell which belongs to a different routing area than the old cell. The update request includes the identifiers of the old and new routing area. When the packet radio node detects a routing area update carried out by an unknown mobile station, it sends information on the change of the packet radio node to the mobile station (9, 12). The mobile station then starts a local procedure in the mobile station a network-level procedure (13, 14) with the new support node in order to update the logical link between them for data transmission.
-
Citations
26 Claims
-
1. A method for updating a routing area in a packet radio network, the method comprising
establishing a logical link between a mobile station and a first radio support node via a radio cell, selecting a second radio cell in the mobile station, the routing area identifier broadcast by the cell being different from the routing area identifier of the first radio cell, sending a routing area update request to the second packet radio support node serving the second cell from the mobile station, detecting in the second packet radio support node that the mobile station has roamed from a routing area served by a different packet radio support node, requesting subscriber data related to the mobile station from the first packet radio support node, sending an acknowledgement message on the routing area update from the second packet radio support node to the mobile station, sending information on the change of the packet radio support node from the second packet radio support node to the mobile station, and initiating a local procedure or a network procedure for initializing a logical link between the mobile station and the second packet radio support node in the mobile station in response to the reception of said information.
-
14. A cellular packet radio network, comprising
mobile stations, packet radio support nodes, which are connected to a digital cellular radio network providing a radio interface for the support nodes for packet-switched data transmission between the support nodes and mobile stations, there being a logical link between the mobile station and the serving packet radio support node, logical routing areas, each of which comprises one or more cells in the radio network, each cell being arranged to broadcast information on the routing area to which it belongs, the mobile stations being arranged to send a routing area update request to the packet radio network when they roam to a new cell which belongs to a different routing area than the old cell, said update request including identifiers of the old and new routing area, the packet radio support node being arranged to request the mobile subscriber'"'"'s subscriber data from the old packet radio support node upon detecting that the old routing area belongs to a different packet radio support node, the packet radio support node being arranged to acknowledge the routing area update to the mobile station when the node has received the subscriber data, the packet radio support node is arranged to send information on the change of the packet radio support node to the mobile station, and the mobile station is arranged in response to the reception of said information to initiate a local procedure or a network procedure for initializing a logical link between the mobile station and the new packet radio support node.
-
20. A method for updating a routing area in a packet radio network, the method comprising
establishing a logical link between a mobile station and a first radio support node via a radio cell, selecting a second radio cell in the mobile station, the routing area identifier broadcast by the cell being different from the routing area identifier of the first radio cell, sending a routing area update request to the second packet radio support node serving the second cell from the mobile station, detecting in the second packet radio support node that the mobile station has roamed from a routing area served by a different packet radio support node, requesting subscriber data related to the mobile station from the first packet radio support node, sending an acknowledgement message on the routing area update from the second packet radio support node to the mobile station, transmitting on broadcast channels of the radio cells information on the basis of which the mobile station can conclude whether the new cell or routing area is related to the same packet radio support node as the old cell or routing area or to a different one, and initiating a local procedure or a network procedure for initializing a logical link between the mobile station and the second packet radio support node in the mobile station after sending said routing area request when the mobile station concludes on the basis of said information that the packet radio support node has changed.
-
23. A cellular packet radio network, comprising
mobile stations, packet radio support nodes, which are connected to a digital cellular radio network providing a radio interface for support nodes for packet-switched data transmission between the support nodes and mobile stations, there being a logical link between the mobile station and the serving packet radio support node, logical routing areas, each of which comprises one or more cells in the radio network, each cell being arranged to broadcast information on the routing area to which it belongs, the mobile stations being arranged to send a routing area update request to the packet network when they roam to a new cell which belongs to a different routing area than the old cell, said update request including identifiers of the old and new routing area, the packet radio support node being arranged to request the mobile subscriber'"'"'s subscriber data from the old packet radio support node upon detecting that the old routing area belongs to a different packet radio support node, the packet radio support node being arranged to acknowledge the routing area update to the mobile station when the node has received the subscriber data, the radio cells are arranged to transmit on broadcast channels information on the basis of which the mobile station can conclude whether the new cell or routing area is related to the same packet radio support node as the old cell or routing area or to a different one, and the mobile station is arranged to start a local procedure or a network procedure for initializing a logical link between the mobile station and the second packet radio support node in the mobile station after sending said routing area request when the mobile station concludes on the basis of said information that the packet radio support node has changed.
Specification