Abstract: Circuitry to remove switches from signal paths in integrated circuit programmable gain attenuators. Programmable gain attenuators and programmable gain amplifiers commonly switch between signal levels using semi-conductor switches. Such switches may introduce non-linearities in the signal. By isolating the switches from the signal path linearity of the PGA can be improved.

Abstract: A wideband radio transceiver system that features a wideband RF section and a flexible and scalable baseband signal processing section. The transceiver system architecture has configurable baseband processing to process signals for multiple communication protocol standards, or multiple instances of the same communication protocol standard, that operate over the same frequency band. Optional additional features include a transmit carrier suppressor and transmit interference canceller to suppress the effects of a transmit signal on receive signal processing when signals are being transmitted and received simultaneously.

Abstract: A tunable element in the microwave frequency range is described that may include one or more tunable elements that are directly digitally controlled by a digital bus connecting a digital control circuit to each controlled element. In particular, each digital signal is filtered by a digital isolation technique so that the signal reaches the tunable elements with very low noise. The low noise digital signals are then converted to analog control voltages. The direct D/A conversion is accomplished by a special D/A converter which is manufactured as an integral part of a substrate. This D/A converter in accordance with the invention may consist of a resistor ladder or a directly digitally controlled capacitor. The direct digitally controlled capacitor may be a cantilevered type capacitor having multiple separate electrodes or sub-plates representing binary bits that may be used to control the capacitor.

Abstract: A receiver includes a phased array antenna and a demodulator. The phased array antenna includes first and second antenna elements and a phase shifter for shifting the phase of a signal received by the first antenna element by a predetermined amount. The demodulator includes a first junction circuit which receives a local signal and a signal output from the phase shifter and which generates a plurality of signals having a phase difference; a second junction circuit which receives a local signal and a signal output from the second antenna element and which generates a plurality of signals having a phase difference; signal combiners for combining corresponding signals output from the two junction circuits; power detectors for detecting the signal levels of the output signals of the signal combiners; and a converter for converting the outputs signals of the power detectors so as to obtain IQ signals.

Abstract: An RF circuit configured to inteface a balanced port (1, 2, 11, 12) with an unbalanced port (4, 14) by emulating the function of a balun. Reactive components (20, 30, 120, 130) in both branches of a balanced circuit form two resonant circuits by resonating with parasitic reactance. At a predetermined operating centre frequency, one of the two resonant circuits is above resonance and the other is below resonance, resulting in a 180° phase difference between the signals delivered by the two branches. When used to interface an unbalanced signal source (10) to a balanced load (40), the input impedance may be set to a real value matching the output impedance of the signal source by selection of the reactive component (20, 30) values.

Abstract: An active tunable filter circuit for use as an integratable active filter in a mobile radio apparatus, comprises an active amplifier circuit (A) including a reactive feedback network including a first tunable element (L1) set to pass with amplification a wanted input signal, and a passive resonant circuit (P) coupled to the active amplifier circuit and including an inductive element (LFB, L3 or L4) and an inactive semiconductor element (FET2, FET3 or FET4) having an interelectrode capacitance which in operation resonates with the inductive element at a harmonic of the wanted signal. In one configuration (FIG. 1) the circuit comprises a band pass filter with amplification and in another configuration (FIG. 6-not shown) the circuit comprises a harmonic notch filter with amplification.

Abstract: Apparatus for coupling communication signal modulated radio frequency signals between an electrical power distribution line and the electrical power wiring at a customer's premises which includes a first transceiver for transmitting and receiving electromagnetic energy is inductively coupled to the distribution line and a second transceiver for receiving electromagnetic energy from, and transmitting electromagnetic energy to, the first transceiver. The second transceiver is coupled to the customer's power wiring to receive communication signals from, and to supply communication signals to, the customer's power wiring. The electrical power for the first transceiver can be supplied by inductive coupling to the power line and/or a battery, the battery being a back-up source when both inductive coupling and a battery are present.

Abstract: A method and system for extending the capabilities of a handheld device by providing a framework within which small handheld devices can use their helper environment, the devices around them, to expand their limited capabilities. Such a framework can be deployed in the office, at home for user convenience or in a public access area as a revenue generating service. A handheld device interacts with the helper environment through several essential steps including device discovery, service query, request transfer and remote control. In order to ensure the proper operation of such an environment, the framework provides essential system components for admission control, resource allocation, task scheduling and device coordination.

Abstract: A charging system for use in a network composed of wireless terminals with a repeater function. As each terminal with a repeater function receives a communication session start request from a user terminal, it searches for a destination user terminal; when it finds the destination user terminal, it transfers the signal sent from the requesting user terminal to the destination user terminal without the mediation of base stations. The information about the amount of data thus transferred or communication time for transferring data is sent to the charging system which is under the control of the communications service provider concerned.

Abstract: A charging system for use in a network composed of wireless terminals with a repeater function. As each terminal with a repeater function receives a communication session start request from a user terminal, it searches for a destination user terminal; when it finds the destination user terminal, it transfers the signal sent from the requesting user terminal to the destination user terminal without the mediation of base stations. The information about the amount of data thus transferred or communication time for transferring data is sent to the charging system which is under the control of the communications service provider concerned.

Abstract: A single wireless system that implements both baseband and non-baseband applications can be provided in a way that securely prevents inadvertent or deliberate alteration of protected code. For example, the possibility exists that with a common system and common storage that baseband processing code may be overwritten by non-baseband applications. By providing an address comparison register that recognizes particular addresses and ensures that those code accesses are routed only to the specific dedicated areas of storage appropriate to either base or non-baseband applications, inadvertent or deliverable overwriting can be reduced or eliminated.

Abstract: A home network system that makes it possible to build a network with assured security, wherein network users need not have security expertise. For access attempts offered from a home node 21-1 in a community area network 5-1 toward an outside public network 1 through a path N2, a security server 11-1 need not execute an authentication process. The home node 21-1 rejects access attempts directly transferred from the public network 1. The security server 11-1 executes the authentication process for an access attempt transferred from the public network 1 through a path N42. When the authentication is successful, connection of the access attempt to the home node 21-1 through a path N9 is permitted.

Abstract: The present invention is related to mobile communication system, and more particularly to a method of providing broadcasting service in the CDMA mobile communication system. The present invention prepares the long codes for a common broadcasting communication channel in the communication systems including at least one or more Base Transceiver Systems implementing wireless connection with terminals, the relevant service is provided/received by establishing the long code and the Walsh code in common at the Base Transceiver Systems implementing broadcasting services.

Abstract: In an individual authenticating method for portable communication equipment which comprises a fingerprint sensor, an operating portion for inputting a personal identification number and controller for authenticating on the basis of fingerprint information and/or the personal identification number thus achieved whether a person to be authenticated is the identical person, the authentication of the person to be authenticated is performed by using fingerprint authentication when the importance level is lower or by using both of fingerprint authentication and personal identification number authentication when the importance level is higher. For example, plural authentication levels are set for the fingerprint authentication in accordance with the importance level of each of the plural functions provided to the portable communication equipment.

Abstract: The present invention relates to a method for utilizing a mobile station for the transmission of authorization information requiring verification in a telecommunication network comprising the mobile station. In the method, the information to be verified is transmitted to the mobile station, the authorization information transmitted is presented on the display of the mobile station, the authorization information presented is read from the display of the mobile station, and the authenticity of the authorization information thus read is verified. According to the invention, the authorization information is sent in a form comprising information to be presented in a graphic form, and the authorization information is presented on the display of the mobile station using a user-independent function of the mobile station in question for the presentation of graphic information.

Abstract: The present invention relates to a mobile set integrating a memory efficient data storage system for the real time recording of voice conversations, data transmission and the like. The data recorder has the capacity to selectively choose the most relevant time frames of a conversation for recording, while discarding time frames that only occupy additional space in memory without holding any conversational data. The invention executes a series of logic steps on each signal including a voice activity detector step, frame comparison step, and sequential recording step. A mobile set having a modified architecture for performing the methods of the present invention is also disclosed.

Abstract: A system and method is disclosed that allows and supports the creation of new services and the enhancement of existing services rendered to users of an Office Land Mobile Network (OLMN). A Service Creation Environment (SCE) process is initiated that accesses state information throughout the OLMN and processes requests for services depending upon such state. The SCE communicates with various network elements via triggers that are conditionally satisfied according to state information in the OLMN. A method for supporting services in a Office Land Mobile Network is further disclosed wherein the steps of said method comprising: initiating a process wherein said process accepts service requests from said users; providing communication access points between said process and applications providing said service; accepting as input by said process a plurality of state information concerning users and said Office Land Mobile Network; satisfying said service requests by said users depending on said state information.

Abstract: The present invention provides a method for transmitting data via a radio transmitter, the data including at least one Internet address; a method for receiving data broadcast by a radio transmitter, the data including at least one Internet address; a radio receiver having a recognition circuit for the isolation of Internet addresses from received data transmitted by radio; and a method for controlling a radio receiver, or a device connected to the radio receiver, by data received by the radio receiver, the data including at least one Internet address, the at least one Internet address being formulated as a query for specific data made available by a provider, and the radio receiver or the device connected to the radio receiver being controlled as a function of data queried via a communication interface in accordance with the at least one received Internet address.

Abstract: Information displayed on the display screen of the wrist-watch-type information unit 50 that uses the information processing function of a non-contact IC card is changed to predetermined information, such as publicity of an event, advertisement information, or information prompting a user's behavior (prompting a user to come to an amusement facility), according to an elapsed time from a predetermined reference time specified by each of attraction systems 40-A to 40-N or a time left until a predetermined reference time.

Abstract: A system and method for conveying a WAP application to a WAP compliant wireless device comprises a WAP compliant wireless device generating a WAP request. A WAP gateway generates a web request in response to the WAP request and conveys the web request to a web server over the Internet. A WAP server reads application definitions from a database that are appropriate for generating a WAP response in response to the WAP request and dynamically generates WML code forming the WAP response using the application definitions read from the database. The WAP server transmits the WAP response to the WAP compliant wireless device via the web server, Internet and WAP gateway. A WAP application builder and method are also provided.

Abstract: Apparatus, and an associated method, for facilitating effectuation of a multicast and broadcast communication service in a CDMA 2000, or other radio, communication system. A broadcast service parameter message generator generates messages including separate parts, one part common to all of the transport channels, and a second part common to less than all of the transport channels. A frame transmitter and frame detector operates pursuant to a modified H-ARQ communication scheme and, a set comparator is provided for the mobile stations operable in the communication system by which to determine a multicast active set of base transceiver stations to which the mobile station tunes to receive the data forming the multicast and broadcast communication service.

Abstract: The present invention is applied to a system comprised of large number of hydraulic excavators 1 deployed at construction sites and a base station 16. Each hydraulic excavator 1 is provided with a storage unit (memory 402), a control unit (CPU 401) for executing the work operation and receiving as input a quantitative machine status relating to the work operation, and a communications device 42. The base station 16 is provided with a communications device 16a, a management server 17 for identifying the serial number of the hydraulic excavator 1 and transferring information, and a database 18 for storing various information. The control unit of the hydraulic excavator 1 and the management server 17 of the base station 16 transfer information.

Abstract: A mobile station is used by one of a plurality of subscribers of a home area wireless service provider. The mobile station includes a memory that stores a list of preferred wireless carrier identities for use by the mobile station when roaming. The list of preferred wireless carrier identities is stored based upon a national account assigned to the mobile station for a plurality of market areas. The mobile station also includes a selector that automatically selects a preferred wireless carrier from the list stored in the memory when the mobile station is roaming and enters one of the market areas of the plurality of market areas.

Abstract: A mobile service platform includes a plurality of gateways interacting with a plurality of servers via a message queue for providing a platform allows mobile devices to communicate with each other and to securely access corporate and Internet contents and services.

Abstract: A methodology to automatically measure network parameters relating to wireless network environments is disclosed. First, if a server's telephone number is detected from power-on registration data stored in a storage device, then a connection with the server is attempted through a mobile station with a data service function using the server's telephone number. Thereafter, if there is test plan from the server after the connection is made, the network parameters is measured using another mobile station with a diagnostic monitor function based on the test plan data. The measured network parameters is then collected and parsed to obtain sets of measured network parameters, each set having a different kind of measured data; and the sets of measured network parameters are transmitted to the server using the mobile station with the data service function when there is a data transmission request from the server or it is time for data transmission.

Abstract: The present invention is directed to forward link and reverse link diversity in a wireless telecommunications network. The present invention solves the reverse link/forward link dependence between a mobile station and a base station of a network by purposely selecting different base stations or sectors of a base station for reverse-link and forward-link transmissions. In one embodiment, reverse link traffic channel transmissions are targeted to a different base station than the base station from which the forward link traffic channel transmissions originate and respective control information of these channels are embedded or transmitted with the opposite link. Such diversity may be activated only in signal conditions that have a certain predefined value or mobile station locations that exhibit a sufficient chance of experiencing a forward or reverse link failure.

Abstract: A system and method are disclosed by which a base transceiver station (BTS) may be uniquely identified. When attempting to determine the location of a mobile unit using signal from multiple BTSs, it is critical that the BTSs be uniquely identified and their position accurately determined. In many cases, the signals received from the BTSs provide limited identification information and cannot be used to uniquely to identify the BTS from which a signal has been received. The present invention uses available information to generate a candidate list and to determine therefrom the most likely candidates for the Measurement BTSs. Based on this information, the system analyzes cell coverage overlap and relative phase delay to determine the likelihood of a candidate BTS being the actual BTS from which a signal is received. As candidate BTSs are uniquely identified, it is possible to use this additional identification information in an iterative process to further identify additional candidate BTSs.

Abstract: Radiation by an ancillary terrestrial network, and/or satellite radiotelephones that communicate therewith are monitored and controlled, to reduce and preferably prevent intra-system interference and/or interference with other satellite radiotelephone systems. In particular, a satellite radiotelephone system includes a space-based component that is configured to wirelessly communicate with first radiotelephones in a satellite footprint over a satellite radiotelephone frequency band, and an ancillary terrestrial network that is configured to wirelessly communicate with second radiotelephones in the satellite footprint over at least some of the satellite radiotelephone frequency band, to thereby terrestrially reuse the at least some of the satellite radiotelephone frequency band.

Abstract: Space-based wireless radiotelephone communications are provided in a satellite footprint over a satellite radiotelephone frequency band. The satellite footprint is divided into satellite cells in which satellite radiotelephone frequencies of the satellite radiotelephone frequency band are spatially reused. At least one of the satellite radiotelephone frequencies that is assigned to a given satellite cell in the satellite footprint is terrestrially reused outside the given satellite cell. A radiation pattern of at least the given satellite cell is modified to reduce interference with the at least one of the satellite radiotelephone frequencies that is terrestrially reused outside the given satellite cell.

Abstract: A remote communications terminal accesses a terrestrial network or information source via a SATCOM link with an earth station hub linked to the network or information source. Information throughput adaptation (ITA) is employed on the SATCOM link to maximize information throughput over the SATCOM link while ensuring acceptable signal quality under varying rain fading conditions. Sufficient power margin is built into the SATCOM link such that, under severe rain fading conditions, the lowest system throughput rate still provides acceptable signal quality. Under lesser rain fading conditions, the data throughput rate is increased via more bandwidth efficient modulation and coding schemes permitted by the higher signal quality which results from greater power margin. The earth station hub and remote terminals monitor the signal quality and communicate to adaptively adjust the modulation and coding used on the forward and return links to maximize information throughput under varying rain fading conditions.

Abstract: A communications system having a plurality of radio communication modes with an audio component, the audio component of the radio communication modes being controlled through an audio panel, and a radiotelephony mode with an audio component being controlled by a radiotelephony device, the audio component of the radiotelephony mode having an audio input for supplying audio to the radiotelephony device. The radiotelephony audio component is integrated with the audio panel, by providing an interface between the audio panel and the radiotelephony device, coupling the audio input of the radiotelephony mode to the audio panel, and directing the audio input of the radiotelephony mode to the interface, the interface coupling the audio input of the radiotelephony mode to the radiotelephony device.

Abstract: A system and method for wireless network communications provides a “dual-mode” wireless device that operates concurrently as a member of two disjoint wireless networks, such as an infrastructure (“IS”) network and an ad hoc (“AH”) network. The dual-mode device has a wireless controller driver inserted in its networking stack (e.g., the stack comprising of the Network and NDIS drivers) that exposes two virtual wireless network adapters, one for the first wireless network and one for the second wireless network. Each virtual wireless network adapter has an associated queue for queuing packets in the flow for the corresponding wireless network mode. The wireless controller driver controls the switching of the network mode. In one embodiment where the two networks include an IS network and an AH network, the mode switching is triggered by poll signals transmitted by an access point of the IS network.

Abstract: Apparatus and methods for managing the operation of wireless communication systems are described for transferring inter-exchange information. Interdepending data pertaining to inter-exchange traffic handling events is transferred from the exchange where the data was entered in man-machine-language (MML) by a human operator to other applicable exchanges where the data is automatically entered base upon a subscription between the serving exchange and the target exchange.

Abstract: A method for transmitting messages on a paging channel is disclosed, in which data burst messages are efficiently transmitted through the paging channel. If the data burst messages transmitted through the paging channel are not transmitted on their slots due to overhead messages, the data burst messages are delayed by a next overhead message transmission period having no overhead message in a system which does not employ a corrected quick paging channel while the data burst messages are first transmitted within a limited range in a system which employs a corrected quick paging channel. Therefore, a receiving rate of the data burst messages can be improved.

Abstract: A manager (1) for controlling a wireless network to which a processing device (2 through 4) is connected comprises a registration module (35, 38) registering the processing device (2 through 4) connected to the wireless network, a wireless communication module (40) communicating with the processing device (2 through 4), a search module (31) searching a processing device (2 through 4) existing within a communicable range through the wireless communication module (40) and a connection control module (31) connecting, when the searched processing device (2 through 4) is registered in the registration module (35, 38), the searched processing device (2 through 4) to the wireless network.

Abstract: In a network supporting concurrent services, mobile terminated call delivery processing is simplified by an apparatus and method for forcing a Mobile Station (MS) (118) to register with a new Mobile Switching Center (MSC) (110) after a hard handoff has occurred. The mobile station registers with the new MSC when the mobile station is in an active data call, but not in an active voice call. The method momentarily sends the data session to dormant mode while the mobile station performs location updating. The method utilizes a new information element in a Clear Command message that allows the MSC to indicate to the Base Station Controller (112) that the period a data session must remain dormant should be very brief. This brief period of time limits the impact on the MS user.

Abstract: There is provided a method for performing an intra-packet data service node (PDSN) soft handoff. The method is implemented by setting up a channel passing through a target base station controller (T-BSC), a source base station controller (S-BSC) and a PDSN by establishing a direct channel link between the S-BSC and the T-BSC in an active packet session mode, performing a handoff between the S-BSC, the T-BSC and a mobile station (MS), transmitting or receiving user packet data exchanged between the MS, and the S-BSC and the T-BSC to or from the PDSN through the established channel link and sending or receiving user packet data exchanged between the MS and the T-BSC to or from the PDSN through the established channel link when the handoff is completed.

Abstract: There is provided a method for performing an intra-packet data service node (PDSN) hard handoff. The method is implemented by setting up a channel passing through a target base station controller (T-BSC), a source base station controller (S-BSC), a source packet control function (S-PCF) and a PDSN by establishing a channel link between the S-BSC and the T-BSC via a mobile station center (MSC) in an active packet session mode, performing the hard handoff between the S-BSC, the T-BSC and a mobile station (MS) and transmitting or receiving user packet data exchanged between the MS and the T-BSC through the established channel link to or from the PDSN in case the hard handoff is completed.

Abstract: Method and apparatus for adjusting the transmission power of base stations in simultaneous communication with a mobile station. The methods described provide for the transmission power of the base stations to be aligned. In the first exemplary embodiment, the transmitters are attached to a separate control unit through communication links. The control unit then derives the most likely command stream and send that to the base stations. In the second exemplary embodiment, the control unit periodically receives the final or average transmit level in a period and an aggregate quality measure for the feedback during a period from each of the transmitters. The control unit determines the aligned power level and transmits a message indicative of the aligned power level to the transmitters. In the third exemplary embodiment, the transmitters send the control unit a message indicative of the transmit power of transmissions to the receiver.

Abstract: The present invention relates to a method for delivering an incoming data call from a Public Switched Telephone Network (PSTN) to a Mobile Station (MS). A Mobile Switching Center (MSC) first receives an incoming call and initiates a call setup procedure with an Interworking Function (IWF). The IWF adapts the data call for a cellular network and completes the call setup procedure with the MSC. The MSC then initiates a connection with a Base Station Controller (BSC) currently serving the MS. After the connection is completed, the PSTN is informed and data transfer with the MS can is initiated.

Abstract: A frequency band for use in wireless communication is selected by passively monitoring at least one of a plurality of available frequency bands (13) to determine whether the at least one frequency band is acceptable for a desired wireless communication. If the at least one frequency band is determined to be acceptable, it is then selected (19) for the desired wireless communication.

Abstract: Transmitting non-polluting dummy pilot signals in a wireless communication network permits estimation of the downlink propagation channels between a number of joint transmitters and a lesser number of receivers. With fewer receivers than transmitters, loop back information from the receivers is not sufficient to determine the downlink propagation channels between the transmitters and receivers. For N transmitters and M receivers, (N-M) dummy pilot symbols are transmitted to facilitate downlink channel estimation. Each dummy pilot signal is transmitted to an imagined or dummy receiver that is virtually located such that its downlink channel coefficient vector is orthogonal to those of the real receivers. Transmit pre-filtering based on estimated propagation channels is applied to the information signals for the real receivers and to the dummy pilot signals. The extent to which the dummy pilot signals interfere at each receiver is an indication of mismatch between estimated and actual propagation channels.

Abstract: A cellular radio system comprising at least one base station and at least one terminal communicating over a radio connection with a base station and a controller for carrying out dynamic channel allocation in a cellular radio network. The controller included in the cellular radio system is arranged to group said one or more terminals communicating over a radio connection with the base station of the cellular radio system into one or more terminal groups, and the controller is arranged to form a priority list for each terminal group of the radio channels in the cellular radio network from the highest quality channels as regards the terminal group, and to allocate one or more radio channels from the channels on the priority list to the terminal if need be.

Abstract: A navigation assistance system provides navigational guidance to a user of a mobile appliance equipped with a radio transceiver. The user can specify a destination address either directly or categorically and select from any choices to resolve ambiguity. The user submits the selected destination to a fixed radio system such as a cellular telephony system which estimates the user position, determines the relative location of the destination and sends to the user appliance data which allows the display of approximate range and bearing to the destination. The mobile appliance can be equipped with a compass which can be electronic and which allows a user to be shown the direction of travel in order to reach the destination.

Abstract: A radio receiver unit includes a GPS receiver, a processor for controlling a radio receiver and connected to the GPS receiver, wherein the processor tunes the radio receiver to a particular radio station based on positional information from the GPS receiver.

Abstract: A method and apparatus of determining a lower bound of an excess delay in a time of arrival measurement of a received signal. Determining the lower bound of an excess delay in a time of arrival measurements includes receiving signals from at least two base stations and determining the time difference of arrival between the received signals from their respective base stations. Then estimating a lower bound of excess delay introduced into the signals received from the base stations based on the time of arrival of the signals from the respective base stations and a known distance between the base stations. The lower bound of excess delay may be used to adjust the estimate of a mobile unit's location based on the time of arrival measurements of the received signals.

Abstract: A system, apparatus, and method for executing an application are disclosed. The system includes a mobile element having user service preferences whose position is monitored by a position monitoring module, a service broadcaster which broadcasts service preferences and related applications to the mobile element, and a comparator coupled to the mobile element to compare the broadcast service preferences to the user service preferences.

Abstract: The present invention provides a method and wireless communication system (100) for verifying a position of a mobile station (102). The system (100) determines whether the mobile station (102) is located within a checkpoint area (130). If so, the system (100) then compares a mobile station position of the mobile station (102) within the checkpoint area (130) and a checkpoint position (128) corresponding to the checkpoint area (130) to generate a result. The system (100) thereafter determines whether the result exceeds a predetermined error tolerance. The system (100) indicates an error associated with the position of the mobile station (102) if the result exceeds the predetermined error tolerance.

Abstract: The present invention provides a method and wireless communication system (100) for verifying a position of a mobile station (102). Upon detection of an activation by the mobile station (102), the system (100) compares a first mobile station position and a second mobile station position to generate a result. The system (100) then determines whether the result exceeds a predetermined error tolerance. The system (100) indicates an error associated with the position of the mobile station (102) if the result exceeds the predetermined error tolerance.

Abstract: The invention concerns a method comprising the following successive steps: reading with a reading device (31) data stored by an identifying transponder chip (10), and transmitting the read data to a mobile telephone (20) whereto the reading device is connected, transmitting by mobile telephone to a control centre (1) a signalling message containing the data read by the reading device, reception at the control centre of the signalling message, and storing the data contained in the message received associated with data identifying the signalling message transmitter, and the time and date at which said message is received.