Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1999-03-15
2001-05-22
Trost, William G. (Department: 2685)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S433000, C455S456500, C455S432300
Reexamination Certificate
active
06236859
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a method for the location-dependent registration of a mobile terminal via an air interface at a base station of a communication network, the base station broadcasting a radio station identification with primary access identification with a first periodicity and a secondary access identification with a second periodicity, in each case as a layer-2 message, at least a part of the primary access identification and, respectively, of the secondary access identification being compared in the terminal with at least a part of subscription data stored in the terminal and the terminal registering at the base station as a home terminal or, respectively, as visiting terminal in the case of a positive result of the comparison.
Such methods are used in communication networks or, respectively, communication systems having a mobile radio function or, respectively, a cordless function. Such communication networks or communication systems can be designed, for example, in accordance with the GSM standard for mobile radio networks, according to the DCS1800 standard for mobile radio networks, or in accordance with the DECT standard for cordless communication networks or communication systems. If a terminal is registered as having access authorization in such communication networks or at such communication systems, characteristic data specific to the terminal are stored in the communication system or, respectively, the communication network and characteristic data specific to the communication system or, respectively, the communication network or a base station are stored as subscription data within the terminal. In the case of terminals according to the GSM standard, within the terminal means that the subscription data are stored in a so-called SIM memory card. If this memory card is inserted in another terminal, this other terminal has access authorization with respect to the communication network. In the case of communication terminals according to the cordless standard DECT (Digital Enhanced Cordless Telecommunication), the subscription data are usually stored in a memory permanently allocated to the terminal.
In a communication system according to the DECT standard, a base station sends at regular intervals a layer-2 message with a radio station identification RFPI (Radio Fixed Part Identity) which contains at least one primary access identification PARI (Primary Access Rights Identity) and a radio station number RPN (Radio Fixed Part Number). If terminals of another network or another system are also permitted within the communication system or, respectively, the communication network, the base station also broadcasts at greater intervals the primary access rights identity of this other system or, respectively, of the other network as secondary access rights identity (SARI) as a layer-2 message. A terminal located within the radio range of a base station contains an international portable user identity (IPUI), with the aid of which the subscriber identifies himself to the network. This international portable user identity is sent by the terminal to a base station when a connection is being set up or in the case of a location registration. In addition, the terminal contains at least one portable access rights key (PARK) and one PARK length indicator PLI as subscription data. The PARK and PLI identities can be used by a terminal for determining whether it has access rights with respect to a base station or a network connected thereto. For the purpose of location registration of a mobile terminal in accordance with the DECT standard, the terminal compares the primary access rights identity PARI of a received radio fixed part identity RFPI with the portable access rights key PARK, stored in its subscription memory, in order to determine whether it is a home terminal of this base station or of the connected network. If data this is not so, the terminal compares secondary access rights identities SARI broadcast by a base station with its subscription data in order to determine whether it has access rights as a visiting terminal with respect to the base station broadcasting this secondary access rights identity. If the terminal recognizes that it has access rights, it initiates a location registration at this base station.
If a network operator of a mobile network or of a cordless network changes its primary access rights identity for whatever reasons, the DECT standard, for example, provides an updating mechanism which enables it to update the subscription data of authorized terminals via the base stations of the network. This gives rise to the problem that only the terminals which are ready to operate in a switched-on state within the transmitting/receiving range of the communication network or, respectively, of the communication system can be reached by such an updating procedure. If, a terminal is not within the transmitting/receiving range of this network or, respectively, of this system whilst the primary access rights identity of a communication network or of a communication system is being changed, the subscription data of this terminal are not updated and the terminal will no longer be able to access the network at a later time.
SUMMARY OF THE INVENTION
It is the object of the invention to specify a method which, after the primary access rights identity of a communication system or of a communication network has been changed, ensures that the terminals having access authorization for this system or this network will operate.
This object is achieved by the invention by means of a method.
In general terms the present invention is a method for the location registration of a mobile terminal via an air interface at a base station of a communication network. The base station broadcasts a radio fixed part identity with primary access rights identity as a layer-2 message with a first periodicity and a secondary access rights identity as a layer-2 message with a second periodicity. At least a certain part of the primary access rights identity and, respectively, of the secondary access rights identity are compared in the terminal with at least a part of subscription data stored in the terminal. The terminal registers at the base station as a home terminal in the case of a positive result of the comparison of a primary access rights identity and registers at the base station as a visiting terminal in the case of a positive result of the comparison of a secondary access rights identity. After a change of the primary access rights identity broadcast by the base station, this base station broadcasts as a secondary access rights identity the primary access rights identity broadcast by it before the change.
Advantageous developments of the present invention are as follows.
After the change of primary access rights identity broadcast by a base station, terminals which can be reached in the communication network are caused to change the subscription data stored within them using an updating procedure, such that they can register as a home terminal at a base station which broadcasts the changed primary access rights identity. When a terminal registers as a visiting terminal at a base station, it is checked within the communication network whether this terminal is a home terminal without updated subscription data in order then to update the subscription data of this terminal using the updating procedure.
After each updating procedure, it is checked within the communication network whether all terminals to be updated have been subjected to an updating procedure. In the case of a positive result of the check, the broadcasting as a secondary access rights identity of the primary access rights identity broadcast before the change is ended.
A method according to the invention for the location-dependent registration of a mobile terminal via an air interface at a base station of a communication network enables a terminal, even after the primary access rights identity of the communication network has been changed and thus after the radio fixed part identity broadca
Milord Marceau
Schiff & Hardin & Waite
Siemens Aktiengesellschaft
Trost William G.
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