Method and system for logging a subscriber station onto the packet service-service state control function cscf in a communications system

description

Method and system for registering a subscriber station to the packet service status control function CSCF in a communication system

The invention relates to a method for registering a station at the connection status and / or service status control function CSCF in a packet-oriented communication system according to the preamble of claim 1 and a communication system for carrying out the method according to the preamble of claim 8.

Novel data services such as the packet data service GPRS (General Packet Radio Service) are currently being introduced into existing mobile radio networks based on the GSM standard. The transmission in the mobile radio network does not take place in a connection-oriented or circuit-switched manner, but in the form of packet data. This type of transmission makes better use of the existing transmission resources in the mobile network. The architecture for the packet data service is based on this (see also Fig. 1) that the stationary or mobile data or communication terminal used by the subscriber, for example a mobile station, is located at its respective location by a service network node

(SGSN: Serving GPRS Support Node) is operated. To receive or send packet data, access to a packet data network is necessary. For this purpose, access network nodes (GGSN: Gateway GPRS Support Nodes) are provided, each of which provide access to the packet data network, for example the Internet, and support a specific packet data protocol, for example the Internet Protocol (IP). A tunnel is provided in the mobile radio network between the service network node and the access network node, via which the packets are transmitted.

In particular for third-generation communication systems - for example the UMTS (Universal Mobile Telecommunication System) - an architecture for IP-based mobile radio networks is provided, which has an extension of the existing GPRS architecture to include connection control and service control. Provide call control components. One of the essential new components for this is a connection status and service status control function CSCF (Call State Control Function). This function takes over, among other things, the connection control or call control functions previously carried out by mobile switching centers (MSC: Mobile Service Switching Center). The connection status and service status function CSCF thus also serves in particular as a connection control entity for multimedia services in the packet-switching or IP-based core network. The determination of the connection status and service status function CSCF responsible for a call takes place in a data station-specific or subscriber-specific manner, that is to say it is specified by the public home mobile communication network of the subscriber HPLMN.

The registration of data terminals or mobile subscriber stations at the registration facility, for example the packet data network of the 3GPP standard (3GPP: 3rd Generation Partnership Project) currently under construction, takes place in stages at two instances in the network. The first instance is the GPRS packet data service, whereby the procedures for the 3GPP system (GPRS Attach and PDP Context Activation) have already been described and standardized. The second instance is the link state and service state function. To log on to the connection status and service status function CSCF, the subscriber must be authenticated and authorized, ie his identity and his access authorization (s) are checked.

However, the previous standard does not yet see any procedures for the selection of the connection status and service status function CSCF and the authorization and authentication of a subscriber or a data station communicating via any IP protocol, for example SIP (Session Initiation Protocol) at the connection status - and CSCF service status function before, ie registering a subscriber and checking his authorization. However, these procedures are absolutely necessary for the safe operation of, for example, packet-oriented 3GPP systems.

The object of the invention is to propose a method for registering a station at the connection status and / or service status control function in a packet-oriented communication system or a communication system for carrying out the method.

This object is achieved by the method having the features of patent claim 1 or the communication system according to the features of patent claim 8.

Advantageous refinements are the subject of dependent claims.

By transmitting the identification information, the method and the communication system offer a simple possibility of authenticating and authorizing a data terminal or station at the connection status and service status function of a packet data network.

To transmit the international mobile subscriber identity or number as identification information offers a particularly simple solution, since this is already individually allocated for all stations and therefore no special identification information has to be newly introduced.

Subsequent to the connection state and service state control function of transmitting an access request corresponding to the identification information to a device and / or function for authorization approval and / or fee collection, the simple possibility is offered of an already provided device or function for authentication / authorization use.

Thereupon, exchanging data with the station for authentication and / or authorization of the station enables a direct request for specific data that can be supplied by the station without the need for an unnecessary number of devices.

Having the device or function for fee collection after receiving the necessary data for authentication and / or authorization to transmit an access confirmation corresponding to the identification information to the connection status and service status control function enables a direct release confirmation to the connection status and service status control function .

With the access confirmation or in addition to this to transmit information about authorizations and / or restrictions on the authorization to the connection state and service state control function, the requesting station can only release certain resources. Restrictions can be imposed, for example, on the radius or diameter of the current location.

After the authentication and / or authorization of the station in the connection state and service state control function, the checking in and the connection establishment can be continued in the usual manner. No further functions or facilities need to be adapted or introduced.

After the connection status and service status control function has been logged in, the station MS or the terminal can set up any connections, in particular connections via any Internet protocol telephony protocols.

In the corresponding communication system, the function for providing subscriber data for fee collection is advantageously subordinate to the home subscriber server, to which the home location register HLR and the subscriber mobility server can also be subordinated. The charging itself is advantageously carried out in the connection status and service status control function.

An embodiment is explained below with reference to the drawing. Show it:

Fig. 1 is a schematic radio communication system with an interface to a packet data service and

2 shows a flowchart for establishing a connection when a radio station is logged into a communication network.

The communication system shown in FIG. 1 shows a radio communication network with devices that enable a GPRS packet data service. As an example of a stationary or mobile communication terminal, a mobile station MS of a mobile subscriber is shown, which via an air interface V with devices of a terrestrial UMTS radio network UTRAN (UMTS Terrestrial Radio Access Network) or whose base station system BSS is wirelessly coupled to fixed base stations BS, base station controls and radio network control devices RNC.

The connection to a packet-oriented communication network GPRS-N is made on the part of the UMTS radio network via the radio network control device RNC. For the transmission of packet data between the mobile station MS and a packet data network PDN, the communication network GPRS-N has one or more service network nodes SGSN and at least one access network node GGSN connected to it. The access network node GGSN is via a

Interface Gi is connected to the actual or a third-party packet data network PDN, while the service network node SGSN is connected to the base station system BSS via an interface Gb. In other words, the communication system has a GPRS packet data network architecture with IP-based packet data network GPRS-N and a radio-side UMTS radio network UTRAN for communication with mobile and stationary radio stations MS. A service relay is located in the service network node SGSN, which maps the interface Gb to the base station system BSS to the interface T to the access network node GGSN and forwards the data packets in both directions.

For the packet data service GPRS, there is initially no connection to packet data service network devices or a packet data access network. In order to use a service, the mobile subscriber has to log on to the network in a first step. On this occasion, his identity and authorizations regarding the general access to the GPRS data service will be checked. In the second step, a packet data protocol must be activated. The packet data service network GPRS-N then provides, for example, a tunnel T between the responsible service network node SGSN and the desired access network node GGSN to the packet data network PDN. After this, packets can be exchanged between the subscriber or the mobile station MS and the external packet data network PDN via this tunnel T.

In the exemplary embodiment described below, the management and transmission of data is at least partially carried out by a connection state and service state control function CSCF in the connection control server CCS (Call Control Server ω ω [V> w ¹ μ> cπ o Cπ o (_π o Cπ

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