Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Utility Patent
1997-11-24
2001-01-02
Hunter, Daniel S. (Department: 2749)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S039000, C455S411000, C455S457000
Utility Patent
active
06169901
ABSTRACT:
DESCRIPTION
Field of the Invention
The present invention relates to a telecommunications system comprising at least a radio base station in whose coverage area a plurality of terminals are called to move, said terminals permitting of being identified at the level of said radio base station by an identifier called internal identifier, and location messages being defined for transporting between terminals and radio base station information relating to the location of said terminals.
The invention likewise relates to a mobile telephone terminal which can be identified at the level of a radio base station by an identifier called internal identifier, and of exchanging location messages with said radio base station.
The invention finally relates to an identification method by means of an internal identifier of a mobile terminal at the level of a telecommunications network comprising at least one radio base station, said network utilizing messages called location messages for transporting between terminals and radio base stations information relating to the location of said terminals.
The invention has significant applications notably in the field of mobile telephony. Applied within the scope of the Digital European Cordless Telecommunication (DECT) standard, it permits of, for example, identifying the various users of a private network or a business network in an easy manner.
BACKGROUND OF THE INVENTION
The internal identity of a terminal is used for transmitting internal calls, that is to say, calls within the same network, which do not need the use of public telephone lines. The mobile telephony standards do not provide a specific internal identification mode of the terminals. Each manufacturer is thus to make his own choice, which blocks any interoperability between the equipment manufactured by the various manufacturers.
It is an object of the present invention to propose a common, particularly advantageous mode of internal identification of the terminals.
SUMMARY OF THE INVENTION
Therefore, a telecommunications system according to the invention and as described in the opening paragraph is characterized in that said internal identifier is transmitted in said location messages.
The use of location messages is particularly advantageous, because it permits of transmitting said internal identity:
on the initiative of the radio base station, or the terminal,
when it is necessary (that is to say, after a subscription or a location procedure).
The location messages indeed provide the advantage that they can be exchanged between a terminal and a radio base station on the initiative of the terminal or of the radio base station. They are exchanged on the initiative of the radio base station when the latter wishes to update its data bases. They are exchanged on the initiative of the terminal when the latter wishes to reveal itself to a radio base station to which it has right of access (for example, when the terminal comes back to the coverage area of a radio base station to which it has right of access, it declares itself ready to receive calls in the neighbourhood of this radio base station).
Moreover, after the subscription of a terminal in the neighbourhood of a radio base station, a location procedure is systematically used, thus providing the possibility of transmitting the internal identity of the terminal between said radio base station and said terminal (the subscription procedure for a terminal consists of obtaining right of access in the neighbourhood of a radio base station).
When said telecommunications system is in conformity with the standard ETSI 300175-5 from the European Telecommunication Standards Institute (called DECT standard in the following of the description), said internal identity is transmitted in the messages “locate-request” and/or “locate-accept” defined in said standard.
In a particularly advantageous embodiment, said internal identity is then transmitted in the field “NWK-assigned-identity” of said location messages.
Indeed, this field has been defined in the standard for transmitting various identities. In its current state, the standard project provides that it can be used for transmitting the Temporary Mobile Subscriber Identity (TMSI) of a terminal within the meaning of the Global System for Mobile Communication (GSM) standard. Its use for transmitting the internal identity of a terminal thus makes it possible to preserve a certain coherence in the application of the standard.
Finally, said internal identity is advantageously formed by alphanumeric characters which renders its use particularly simple.
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patent: 4723303 (1988-02-01), Koch
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patent: 5384824 (1995-01-01), Alvesalo
patent: 5797097 (1998-08-01), Roach, Jr. et al.
patent: 5950137 (1999-09-01), Kim
patent: 6035198 (2000-03-01), Wiehe
patent: 6049718 (2000-04-01), Steward
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Wireless Networks, vol. 1, No. 1, pp. 83-93, Rao S et al : “Interworking Between Digital European Cordless telecommunication and a Distributed Packet Switch” Feb. 1995.
“Interworking between Digital European Cordless Telecommunications and a distributed packet switch”, by Rao et al, Wireless Networks, vol. 1, No. 1, Feb. 1995, pp. 83-93.
Halajian Dicran
Hunter Daniel S.
Tran Pablo N.
U.S. Philips Corporation
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