Telecommunications – Radiotelephone system – Programming control
Reexamination Certificate
1999-09-02
2004-05-25
Vo, Nguyen T. (Department: 2682)
Telecommunications
Radiotelephone system
Programming control
C455S462000, C455S465000, C455S552100
Reexamination Certificate
active
06741854
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to both a process for the transmission of operating parameters from a control centre to a positionally limited cordless telecommunications system with a base station and with at least one mobile station initialised at it, and a corresponding cordless telecommunications system for carrying out this transmission process with a base station and with at least one mobile station initialised at the base station.
The term “initialised” denotes any mobile station fundamentally set up for operation with the base station and the term “registered” an initialised mobile station communicating with the base station.
A known positionally unlimited telecommunications system with a stationary radio device (base station) and with moving radio devices (mobile stations) which both exchange radio signals with one another via a radio connection is described in the book “The GSM System for Mobile Communications” written by M. Mouly and M. B. Pautet 1992 and published in-house at Palaiseau, France. The radio communications system described in the book is the public mobile radio system “global system for mobile communications” (GSM) of which the technical components satisfy the standard with the same name “GSM”.
It is stated on pages 424 to 427 in section 6.3.9 and 6.3.10 of this book that operating parameters of a mobile station change when their location changes. For example, the frequency properties of a frequency hopping channel have to change synchronously with other mobile stations in order to cope with a change in the positionally different frequencies. As a radio signalling channel (BCCH: broadcast control channel) is provided in the GSM network, a signalling connection to the mobile stations can be created without difficulty at any time for transmitting operating parameters.
In cordless positionally limited telecommunications systems (CTS=cordless telephone system) with which a certain number of mobile stations are operated by a base station with a positionally limited transmission range—without a BCCH having to be provided—, central transmission of operating parameters to the base station and to all mobile stations initialised at it is desirable in each case. Sets of operating parameters for the CTS, for example frequency lists or frequency hopping sequences, can change according to the requirements of the network operator (hereinafter also called operator for short) of a public land mobile network (PLMN) or an authorised institution (for example a state regulatory authority issuing radio frequency licences to the users). These changes must be distributable to the base stations (CTS-FP=CTS-fixed part) and to the mobile stations (MS=mobile station) initialised at them, regardless of whether or not the mobile stations are registered in the cordless telecommunications system at the time of distribution. Furthermore, mobile stations can be registered either at the CTS or at the GSM (so-called “dual mode terminals”), according to whether or not they are located within the transmission range of the CTS. A CTS is also subject to the constraint that no parameters can be transmitted via a broadcast carrier, and, moreover, does not necessarily have PLMN coverage:
For example, if a new CTS is to be initialised for the first time when a periodic operating parameter is to be checked by the CTS, when changes are effected by a control centre (network operator or authorised institution) or when the CTS location changes (for example owing to a move). In such cases, it is necessary to transmit (update) operating parameters (sets of parameters) to the CTS-FP and to its MS.
SUMMARY OF THE INVENTION
It is accordingly the object of the present invention to provide a transmission process with which operating parameters can be distributed centrally in the easiest manner to one or more positionally limited cordless telecommunications systems and can be activated, and to provide a corresponding cordless telecommunications system.
This object is achieved according to the present invention by a process for the transmission of operating parameters to a positionally limited cordless telecommunications system with a base station and at least one mobile station initialized at the base station, from a control center of a superimposed telecommunications network, comprising the steps of initially transmitting the operating parameters via the superimposed telecommunications network to the base station or to one of its mobile stations, relaying the operating parameters from the base station to as far as possible all initialized mobile stations or from one mobile station to the base station and then as far as possible to all other initialized mobile stations, and then activating the operating parameters. The invention is further directed to a cordless telecommunications system employing such a process.
The object is therefore achieved according to the invention in that via a superimposed telecommunications network, the operating parameters are initially transmitted to the base station or to one of its mobile stations and are then relayed from the base station to as far as possible all initialised mobile stations or from one mobile station to the base station and as far as possible to all other initialised mobile stations and are activated. For this purpose, the control centre is connected to the superimposed telecommunications network (so-called “overlay network”).
The process according to the invention allows the control centre and therefore also the PLMN operator or the authorised institution directly or indirectly to make changes to CTS operating parameters (sets of parameters) and to activate these operating parameters. Operating parameters are transferred in two stages: the operating parameters are initially transferred from the control centre to the CTS, namely to the base station or to one of its mobile stations. These operating parameters are then distributed within the CTS independently of the control centre, i.e. relayed to the base and mobile stations present there.
With a preferred embodiment of the transmission process according to the invention, the superimposed telecommunications network is a wired telecommunications network, for example a PSTN (=public switched telephone network) or an ISDN (=integrated services digital network). The transfer of operating parameters can be initiated in that the network operator or the authorised institution calls the base station via the PSTN or ISDN and transmits the operating parameters to the base station.
In particular during a periodic operating parameter check by the base station, it is advantageous if the transmission of operating parameters is effected by the base station or by one mobile station, i.e. by the CTS itself. For example, the base station is able to call the network operator via the PSTN or the ISDN. Therefore, a call back through the network operator or the authorised institution can optionally be effected.
Alternatively, a mobile station calls the network operator via the PLMN, temporarily stores the operating parameters on its subscriber identification module or in other mobile equipment and transfers it to the base station at a later stage.
In particular if operating parameters are transmitted by the network operator to a mobile station initialised at the base station but not registered at the base station owing to an excessive distance, this one mobile station initially temporarily stores the operating parameters transmitted to it and relays them to the base station at a later stage when it is located at an appropriate transmission range. The network operator or the authorised institution calls a mobile station via PLMN. The mobile station temporarily stores the operating parameters in the SIM or ME and later transfers them to the base station. Transfer from the network operator to the mobile station can be effected via a superimposed cordless network (for example via the GSM network), by means of which the transmitted operating parameters can also be relayed fro
Barth Ulrich
Kühn Edgar
Sperber Christoph
Alcatel
Sughrue & Mion, PLLC
Vo Nguyen T.
LandOfFree
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