Routing area updating in packet radio network

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 initiates the establishment of a logical link by sending a link establishment message (LLC Subm, 21, 21') to the mobile station, the message including the same identifier the mobile station used for itself in the routing area update request. The mobile station initializes the logical link at its own end and sends and acknowledgement to the serving packet radio support node.

Description

technical field [0001] The present invention relates generally to packet radio networks, and more particularly to supporting mobility in packet radio networks. Background technique [0002] The development of the mobile communication system is developed with the requirement that people can make calls even if they are not at the fixed-line terminal. With the increasing use of various data transmission services in the office, various data services have also entered the mobile communication system. Portable computers allow users to perform efficient data processing wherever they are. In order to carry out mobile data transmission, the mobile communication network itself provides users with a more effective access network than the actual data network. For this reason, some new data services have been designed for existing and future mobile communication networks. Mobile data transmission can especially be supported by digital mobile communication systems such as the pan-Europ...

AI Technical Summary

Problems solved by technology

However, in this case, the MS has no information and it cannot initiate reactivation of the PDP context

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