The invention relates to a method (100) for geolocating a terminal (20i) by means of an access network of a wireless communication system. The invention is based on cooperation between a first geolocation method and a second geolocation method, as well as on control of an operating mode of the terminals (20). When a terminal (20, 20i) is configured in a first operating mode, it allows the access network to estimate (102) the position of the terminal using the first geolocation method. The positions estimated by the first geolocation method are used to train (103) the machine learning algorithm of the second geolocation method. It then becomes possible, once the algorithm has been trained, to estimate (104) the geographical position of a terminal (20i) even if this terminal is not in the first operating mode. The first geolocation method is more accurate than the second geolocation method, but it requires more power consumption and/or radio resources for the terminals (20).
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
2.
METHOD FOR RECOVERING THE SYMBOL TIME BY A RECEIVING DEVICE
A method for recovering the symbol time by a receiver to decode a sequence of symbols transmitted by a transmitter when the symbol time of the transmitter is biased with respect to the symbol time of the receiver. When a transition is detected between two consecutive symbols, an absolute error on the instant of the current symbol is measured and a statistical model of the bias is updated. A correction may then be applied to the instants of the subsequent symbols depending on the measured absolute error and/or a bias estimated from the statistical model. During periods in which there are no transitions between symbols, an absolute error cannot be measured, but it is still possible to apply a correction to the instants of the subsequent symbols depending on a relative error extrapolated from the statistical model.
H04L 7/033 - Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal- generating means, e.g. using a phase-locked loop
H04L 7/00 - Arrangements for synchronising receiver with transmitter
3.
METHOD FOR TRANSMITTING AND RECEIVING A MESSAGE INCLUDING AN ENCRYPTED IDENTIFIER OF THE TRANSMITTER DEVICE
In a digital communication system, using a symmetric key encryption protocol, the identifier of a transmitter included in a message transmitted to a receiver is encrypted. The identifier is divided into P parts, P being an integer number at least equal to two. The parts are ordered and associated, respectively, with ranks varying between one and P. For at least one part of rank greater than or equal to two, an encryption key is determined on the basis of the values of the parts of preceding rank and is encrypted with the encryption key thus determined. An encrypted identifier is then determined from the one or more encrypted parts thus obtained. The message to be transmitted is then formed from the encrypted identifier thus determined, and then transmitted to the receiver.
The invention relates to a data-management system (10) for managing data in at least two data-storage entities (11) having different operating costs and different performance levels in terms of latency and/or data rate. A distribution unit (12) is configured to distribute data to the various storage entities (11) in accordance with distribution rules (13). An access unit (15) is configured to process a request sent by a user (17) seeking to access data stored in the storage entities (11). A control unit (16) is configured to update the distribution rules (13) using a machine learning algorithm trained to determine, on the basis of the received user requests, distribution rules that optimize a compromise between the costs and the performance levels of the storage entities used by the data-management system (10).
The invention relates to a method for geolocating a terminal (20) of a wireless communication system (10). The terminal detects one or more identifiers (ID1, ID2, ID3) of neighbouring transmitting devices (40). The terminal sends the detected identifiers in a message to an access network (30). A server (32) of the access network determines, for each identifier, a score representative of the reliability of said identifier relative to a geolocation database (51). For this purpose, the server (32) uses an identifier reliability database (33) that stores identifiers of transmitting devices (40) and their respective scores. The geolocation database (51) stores identifiers of transmitting devices (40) and their respective geographical positions. The server (32) selects the identifiers having the best scores to geolocate the terminal (20) using the geolocation database (51).
The invention relates to a method for geolocating a terminal (20) of a wireless communication system (10). The terminal detects, for at least one transmitting device (40), an identifier (ID3) of the transmitting device. The terminal performs a lossy compression of the identifier of the transmitting device in order to obtain a reduced identifier (CID1), and then sends this reduced identifier to the access network in a message. The access network is capable of determining the identifier of the transmitting device from the reduced identifier, from discrimination information (Info3) determined from the received message, and from an ambiguity resolution database (33) making it possible to construct several lists of transmitting device identifiers each associated with a different value of the discrimination information. The geographical position of the terminal can then be estimated from the identifier of the transmitting device and using a geolocation database (51) storing a list of transmitting device identifiers and the respective geographical positions of said transmitting devices.
H04W 4/029 - Location-based management or tracking services
H04W 4/80 - Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
7.
METHOD FOR UPDATING A DATABASE OF A GEOLOCATION SERVER
The invention relates to a method for updating a database of a geolocation server (50) using a wireless communication system (10). The database comprises a table associating an identifier of a transmitting device (40) with at least one piece of information about its geographical position. The communication system comprises an access network (30) and a terminal (20) suitable for communicating with the access network and with the transmitting devices according to two separate protocols. The terminal receives a message sent by a transmitting device and comprising an identifier of the transmitting device. The terminal sends a message with this identifier to the access network. The access network determines a piece of information on the geographical position of the terminal. A consistency check is performed between the terminal position information determined by the access network and the piece(s) of position information present in the table. The table is updated according to the result of the consistency check.
H04W 4/02 - Services making use of location information
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
G01S 5/04 - Position of source determined by a plurality of spaced direction-finders
G01S 5/06 - Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements
8.
METHOD FOR COLLABORATIVELY DECODING A CORRUPTED FRAME DETECTED BY SEVERAL BASE STATIONS WHILST OPTIMISING THE ACCESS NETWORK LOAD
In a wireless communication system, a method (100) for decoding a frame transmitted by a transmitter device is executed by a receiver device. The method (100) comprises the following steps: - selecting (102) one or more gateway stations likely to have detected, on a communication channel, a corrupted frame corresponding to the frame to be decoded, the selection (102) being carried out such that a gateway station does not have to have previously communicated, to the receiver device, an item of information relating to the possibly detected corrupted frame in order to be selected, - sending (103) a request to each selected gateway station in order to request that the selected gateway station transmit the possibly detected corrupted frame, - combining (104) the corrupted frames transmitted by the various selected gateway stations in order to decode the frame.
H04L 1/16 - Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
H04L 1/06 - Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
9.
METHOD FOR RECOVERING THE SYMBOL TIME BY A RECEIVING DEVICE
The invention relates to a method (100) for recovering the symbol time by a receiving device (31) in order to decode a sequence (40) of symbols transmitted by a transmitting device (20) when the symbol time of the transmitting device is biased with respect to the symbol time of the receiving device. When a transition is detected (102) between two consecutive symbols, an absolute error on the instant of the current symbol is measured (103) and a statistical model of the bias is updated (104). A correction (105) may then be applied to the instants of the subsequent symbols depending on the measured absolute error and/or a bias estimated from the statistical model. During periods in which there are no transitions between symbols, an absolute error cannot be measured, but it is still possible to apply a correction (107) to the instants of the subsequent symbols depending on a relative error extrapolated from the statistical model.
H04L 7/033 - Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal- generating means, e.g. using a phase-locked loop
H04L 7/04 - Speed or phase control by synchronisation signals
10.
METHOD FOR TRANSMITTING AND RECEIVING A MESSAGE CONTAINING AN ENCRYPTED IDENTIFIER OF THE TRANSMITTER DEVICE
In a digital communication system, the invention makes it possible, using a symmetric key encryption protocol (40), to encrypt the identifier (30) of a transmitter device (10) contained in a message transmitted to a receiver device (20). The identifier (30) is divided into a whole number P of parts (32) at least equal to two. The parts (32) are ordered and associated, respectively, with ranks varying between one and P. For at least one part (32) of rank greater than or equal to two, an encryption key (41) is determined on the basis of the values of the parts of preceding rank, and said part (32) is encrypted with the encryption key thus determined. An encrypted identifier (31) is then determined from the one or more encrypted parts (33) thus obtained. The message to be transmitted is then formed from the encrypted identifier (31) thus determined, and then transmitted to the receiver device.
The invention relates to a method for the transmission (200) of a message by a transmitter device (20) of a communication system (10). The message contains an identifier of the transmitter device and a message number. The identifier is ambiguous in the sense that the identifier may be shared by multiple different transmitter devices. The transmission method (200) comprises determining (203) the message number to be used for the message to be transmitted, firstly on the basis of a message number sequence (222) assigned to the transmitter device (20) and secondly on the basis of a message number (223) of a previous message transmitted by the transmitter device (20). One and the same sequence may be assigned to various transmitter devices having different identifiers, but it may not be assigned to another transmitter device having the same identifier. A reception method according to the invention may then unambiguously identify the transmitter device.
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
H04W 88/06 - Terminal devices adapted for operation in multiple networks, e.g. multi-mode terminals
13.
METHOD FOR THE GEOLOCALISATION OF A BROADCASTING BEACON OF A WIRELESS COMMUNICATION SYSTEM
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
G01S 5/00 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations
14.
VEHICLE-SHARING SYSTEM AND METHOD FOR ACCESSING A VEHICLE FROM SUCH A SYSTEM
The invention relates to a vehicle-sharing system (20). A server (30) of the system has access to a database comprising information on a user's subscription to a car-sharing service. A terminal (50) of the user comprises a local database (52) comprising a list of vehicles that can be used and, for each vehicle, information enabling communication with the vehicle to be established. The terminal is configured to pair with a vehicle (40) and to send it a reference to the user's subscription to the vehicle-sharing service. The vehicle is configured to transmit the reference to the server. The server is configured to verify the user's subscription information present in the server's database from the transmitted reference and, if the verification is successful, to issue an authorisation to access the vehicle so as to enable the user to remotely access the vehicle.
H04W 4/80 - Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
15.
METHOD AND SYSTEM FOR GEOLOCATING AN OBJECT USING A MOBILE BASE STATION
The invention relates to a method (100) for geolocating a terminal (11) of a wireless communication system using measurements of a parameter representing a radio signal exchanged between the terminal and base stations of the communication system. The method uses fixed base stations (12) and a mobile base station (13) that is moved within a determined search area (20). During a predefined search period, the terminal transmits several radio signals to the fixed base stations and the mobile base station. A precise geographical position can thus be determined using, on one hand, measurements performed during the search period for the different base stations, and on the other hand, geographical positions of the fixed base stations and geographical positions of the mobile base station at different transmission times of the radio signals by the terminal.
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
G01S 5/00 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations
The present invention relates to a method (50) for transmitting a broadcasting message by an access network (30) intended for a group of terminals (20). The terminals are configured to recurrently and asynchronously transmit polling messages intended for the access network. The method comprises: - determining (51) an instant for transmitting the broadcasting message on the basis of information relating to the recurrence of the polling messages transmitted by the terminals (20) of said group; - transmitting (52), before transmitting the broadcasting message and for each polling message received from a terminal of the group, a response message comprising one or more parameters relating to the transmission of the broadcasting message, said response message having to be received by said terminal during a listening window with a predetermined duration following the transmission of the polling message; - transmitting (54) the broadcasting message over the broadcasting channel at the determined transmission instant.
The present invention relates to a method (50) for transmitting a message via an access network (30) to a group of terminals (20), comprising: - transmitting (51), via the access network (30), said message to said group of terminals (20) over a broadcast channel, - receiving (52), via said access network (30), a request for retransmission of said transmitted message not having been correctly received by a terminal, - evaluating (54), via the access network (30), a predetermined broadcast retransmission criterion, - retransmitting (53), via the access network (30), said message over a point-to-point link or over a broadcast channel according to said broadcast retransmission criterion.
H04W 68/06 - User notification, e.g. alerting or paging, for incoming communication, change of service or the like using multi-step notification by changing the notification area
H04W 48/12 - Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
The invention relates to a directional antenna (10) comprising an array (12) of unitary antenna elements. The array (12) comprises an active antenna element, called "radiator element (20)", which is intended to be electrically connected to a radiofrequency receiver or source, and at least one passive antenna element supplied with power by mutual induction, called "parasitic element (30)". The antenna is noteworthy in that the radiator element (20) is a parasitic resonator antenna comprising a monopole (21), a ground plane (22) and a parasitic cell (23) that is placed in the near field of the monopole (21). In particular embodiments, the ground plane (22) is used to accept tracks of an electronic circuit of a transmitter or receiver device. The antenna performs particularly well in terms of directivity and radiating efficiency, while being highly compact.
H01Q 1/38 - Structural form of radiating elements, e.g. cone, spiral, umbrella formed by a conductive layer on an insulating support
H01Q 9/30 - Resonant antennas with feed to end of elongated active element, e.g. unipole
H01Q 19/26 - Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of a single substantially straight conductive element the primary active element being end-fed and elongated
H01Q 19/32 - Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using a secondary device in the form of two or more substantially straight conductive elements the primary active element being end-fed and elongated
19.
METHOD AND SYSTEM FOR ACHIEVING WIRELESS COMMUNICATION BETWEEN A SENDER DEVICE AND A RECEIVER DEVICE BY MEANS OF A REPEATER DEVICE, WITHOUT LOSS OF INFORMATION ON A PHYSICAL PROPERTY
The present invention relates to a method (50) for achieving wireless communication between a sender device (20) and a receiver device (30) via a repeater device (40), comprising steps of: - (51) measuring, with the repeater device (40), the value of a first physical property of a message received from the sender device (20), - (52) determining, with the repeater device and depending on the value of the first physical property measured for the received message, the value of a second physical property to be used for the retransmission of said message, - (53) retransmitting, with the repeater device (40), the message to the receiver device (30), using the determined value of the second physical property.
METHOD AND SYSTEM FOR WIRELESS COMMUNICATION BETWEEN TRANSMITTER DEVICES AND A RECEIVER DEVICE BY MEANS OF A REPEATER DEVICE WITH SIMULTANEOUS REPETITION
The present invention relates to a method (50) for wireless communication between a plurality of transmitter devices (20) and at least one receiver device (30) via a repeater device (40) on the surface of the earth, comprising steps of: - (51) collection, by the repeater device (40), of messages transmitted by transmitter devices and received by the repeater device during a collection window, - (52) retransmission, by the repeater device, of the messages received during the collection window intended for the at least one receiver device, the messages received during the collection window being retransmitted so that at least two messages received non-simultaneously are simultaneously retransmitted to the at least one receiver device.
The present invention relates to a method (60) for geolocating a terminal (20) in a wireless communication system (10), comprising: - receipt (61) by the terminal (20) of a message transmitted by a transmitting device of interest (40), - obtaining (62) an ambiguous item of identification information from the transmitting device of interest, - transmission (63), by the terminal (20) to the access network (30) of a message including the ambiguous item of identification information from the transmitting device of interest, - estimation (65) by the access network (30) of an approximate geographical position of the terminal (20), - identification (66) of the transmitting device of interest in a table storing a list of transmitting device identifiers and the respective geographical positions of said transmitting devices, - estimation (67) of the precise geographical position of said terminal according to the geographical position of said transmitting device of interest.
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
22.
METHOD AND SYSTEM FOR GEOLOCATING A TERMINAL OF A WIRELESS COMMUNICATION SYSTEM
The invention relates to a method (10) for geolocating a terminal (70) of a wireless communication system (60). The terminal comprises a positioning device for obtaining a precise geographical position of the terminal. An access network (80) of the communication system is configured to estimate an approximate geographical position of the terminal. In order to limit the size of the messages exchanged between the terminal and the access network, only a truncated part of the information about the precise geographical position of the terminal is transmitted by the terminal to the access network. The access network is configured to determine the precise geographical position of the terminal by combining the truncated information received from the terminal with the approximate geographical position estimated by the access network.
H04W 64/00 - Locating users or terminals for network management purposes, e.g. mobility management
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
23.
METHOD AND SYSTEM FOR GEOLOCATION OF GROUP-EVOLVING TERMINALS
The invention concerns a method for estimating the geographical position of a terminal (70i) of interest, among a panel of terminals (70) of a wireless communication system (60), comprising: - determining (52), for each terminal of said panel, a time signature comprising values measured for said terminal during a predetermined observation period, - calculating (54) values of similarity between the time signatures of the terminals of the panel, a similarity value calculated for two terminals representing the probability of said terminals being moved together or having been located at the same place during said observation period, - partitioning (56) various terminals of the panel into different groups depending on the similarity values, - estimating (44) the geographical position of the terminal of interest as a function of the available geolocation data for at least one other terminal of the group to which the terminal of interest belongs.
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
24.
METHOD AND SYSTEM FOR GEOLOCATING A TERMINAL OCCUPYING PARTICULAR GEOGRAPHICAL POSITIONS
The invention relates to a method (10) for geolocating a terminal of a wireless communication system. A set (26) of reference elements is determined with the aid of messages emitted by calibration terminals (72) during a calibration phase (20). Each reference element comprises a radio signature and a geographical position of a calibration terminal during the emission of a message. A refinement phase (30) makes it possible to clean and/or to enrich the set (26) of reference elements by virtue of the identification of points of interest corresponding to preferential positions of emission of messages by the terminals. During a search phase (40), the position of a terminal (70) of interest is determined on the basis of its radio signature and of the modified set (36) of reference elements.
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
25.
METHOD FOR ASSISTANCE WITH THE REMOTE CONFIGURATION OF AN EUICC CARD AND SYSTEM FOR IMPLEMENTING SUCH A METHOD
The invention relates to a terminal (1) provided with an eUICC card (10) having an incomplete provisioning profile (11), that is at least one missing datum (111) essential to the establishment of a communication between the terminal (1) and an access network (21) of a first wireless communication system (2) is not defined by default in the provisioning profile (11). In order to remotely configure the eUICC card (10) by means of the provisioning profile (11), prior communication is established between the terminal (1) and an access network of a second wireless communication system (3) in order to transmit the missing data (111) so as to be able to complete the provisioning profile (11).
The present invention relates to a method (50) of notification, by a terminal (20), of information determined by said terminal, the method comprising: - an evaluation (51), as a function of measurements provided by a motion sensor (22), of a predetermined criterion for motion detection and, when the motion detection criterion is satisfied: a time-stamping (52) of the motion detected by storing an instant of detection of the detected motion, - a determination (53), as a function of the instants of detection, of respective instants of start and of instants of end of mobility phases of the terminal (20), - a determination (54) of information by the terminal (20) as a function of the respective instants of start and of the instants of end of mobility phases of said terminal, - a formation (55) of a notification message comprising the information determined, - a sending (56) of the notification message.
The invention relates to an antenna (1) comprising a ground plane (11), a metal plate (10) arranged facing said ground plane (11), and a supply wire (12) for connecting the plate (10) to a generator (16) or a receiver, such that said antenna (1) has a first resonance frequency in a patch antenna mode. The antenna (1) further comprises a ground wire (13) connecting the plate (10) to the ground plane (11), and a capacitive element (15a, 15b, 15c) arranged in series with the ground wire (13) between the supply wire (12) and the ground plane (11), such that the antenna (1) also has a second resonance frequency in a wire-plate antenna mode.
H01Q 5/314 - Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
H01Q 5/328 - Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors between a radiating element and ground
H01Q 5/335 - Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
H01Q 1/32 - Adaptation for use in or on road or rail vehicles
28.
Method of selecting, via a terminal, a communication mode for exchanging data with base stations
A method of selecting, by a terminal of a wireless communication system, a mode of communication to be used to exchange data with the base stations of the wireless communication system. The mode of communication being selected from among at least two different modes of communication associated with different respective geographical zones. The terminal receiving a surveillance message transmitted by an aircraft, the surveillance message includes information on the position of the aircraft. The terminal estimating the geographical zone in which the terminal is situated, as a function of the aircraft position information extracted from the received surveillance message. The mode communication is selected as a function of the estimated geographical zone of the terminal.
The present invention relates to a wireless communication system (10) comprising a cellular access network (31) connected to a cellular network core (30), said cellular access network comprising cellular base stations (310) adapted to exchange data with terminals (20) on physical channels, called coordinated access channels, each cellular base station (310) serving a geographical area, all the geographical areas served by said cellular base stations forming a geographical region. The wireless communication system (10) comprises random access base stations (320) serving the geographical region, each random access base station (320) being adapted to receive data emitted by terminals on a permanent physical channel, called random access channel, the permanent physical random access channels of said random access base stations using the same radio resources throughout the geographical region.
The invention concerns a method (10) for geolocating a terminal of a wireless communication system, based on a learning method making it possible to estimate the geographical position of a terminal using both a radio signature corresponding to a set of values representative of the quality of radio links existing between the terminal located at the sought position and a plurality of base stations of said wireless communication system, as well as a reference data set associating radio signatures with known geographical positions. To limit the complexity of the learning algorithm and to make it resistant to topology changes of the access network, the geolocation method is characterized in that each radio signature contains a selection of N values among the set of measured values, as well as the geographical positions of the corresponding base stations.
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
31.
METHOD AND SYSTEM FOR DETECTING A MALFUNCTION IN A BASE STATION OF A WIRELESS COMMUNICATION SYSTEM
The invention relates to a method (40) for detecting a malfunction in a base station (81) of an access network (80) of a wireless communication system (60), referred to as the assessed base station, said malfunction being detected by assessing a criterion for a metric representing the operation of a base station of said wireless communication system (60) as a function of values of the metric measured for said assessed base station and for at least one other base station (81), referred to as the reference base station.
The present invention concerns a method (200) for transmitting a signal by a transmitter device (110) to a satellite (120) moving in orbit around the Earth, said transmitter device (110) and the satellite (120) comprising wireless telecommunication means. Said method comprises the steps: - receiving (210), by said transmitter device (110), a signal transmitted by the satellite (120), termed the presence signal; - analysing (220) a frequency shift induced by the Doppler effect on the presence signal received by said transmitter device (110); - estimating (230) a later change over time of said frequency shift starting from a later predetermined time of the beginning of transmission of the signal to be transmitted by the transmitter device (110) and over a predetermined duration of said signal to be transmitted; - precomprensating (240) the later change over time estimated from the frequency shift on the signal to be transmitted.
The present invention relates to a method (50) for selecting, by a sending device (12) of a first wireless communication system (10), a communication mode to be used for said first wireless communication system, said communication mode being selected from among at least two different communication modes associated with different geographical zones. The method (50) comprises: - listening (51) to a second wireless communication system (20) different from the first wireless communication system (10) and having at least two different communication modes associated with different geographical zones, - determining (52) the communication mode used by said second wireless communication system, - selecting (53) the communication mode to be used for the first wireless communication system (10) according to the communication mode used by the second wireless communication system (20).
H04W 72/02 - Selection of wireless resources by user or terminal
H04W 76/16 - Setup of multiple wireless link connections involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer
34.
METHOD AND DEVICE FOR TRANSMITTING ENCRYPTED DATA, METHOD AND DEVICE FOR EXTRACTING DATA
The present invention relates to a method (50) for transmitting, by means of a transmitter device (20), a packet to a receiver device (30) of a communication system, said packet including data encrypted according to a symmetric key encryption protocol, including: - determining (51) the value of an item of generation information; - determining (52) an encryption key according to the value of the generation information; - encrypting (53) the data to be included in the encrypted packet to be transmitted according to the encryption key; - calculating (54) a truncated item of information on the basis of the generation information; - calculating (55) a verification code for the encrypted packet according to the encrypted data and the first portion of the generation information; - forming (56) the encrypted packet to be transmitted on the basis of the truncated information, the verification code and the encrypted data.
H04L 9/32 - Arrangements for secret or secure communicationsNetwork security protocols including means for verifying the identity or authority of a user of the system
35.
METHOD FOR TRANSMITTING A SIGNAL BY A TRANSMITTER DEVICE TO A NON-GEOSYNCHRONOUS SATELLITE
The present invention relates to a method (200) for transmitting a signal by a transmitter device (110) to a satellite (120) moving in orbit around the Earth, said transmitter device (110) and the satellite (120) comprising wireless telecommunication means. The method comprises the following steps: - receiving (210), by said transmitter device (110), a signal transmitted by the satellite (120), referred to as a presence signal; - analysing (220) a frequency shift caused by Doppler effect on a main frequency of the presence signal received by said device (110); - evaluating (230) a proximity criterion between said transmitter device (110) and said satellite (120) on the basis of the analysis of the frequency shift; - transmitting a signal by said transmitter device (110) if the proximity criterion is met.
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
G01S 11/10 - Systems for determining distance or velocity not using reflection or reradiation using radio waves using Doppler effect
36.
METHOD AND ACCESS NETWORK FOR ESTIMATING THE MOVEMENT OF A TERMINAL OF INTEREST WITH RESPECT TO SAID ACCESS NETWORK
The present invention relates to a method (50) for estimating the movement of a terminal (20) of interest with respect to an access network (30), including steps of: - (51) measuring an incoming frequency of a message of interest transmitted by the terminal of interest and received by a pair of base stations (31-1,31-2) of the access network; - (52) measuring the incoming frequencies of calibration messages transmitted by calibration terminals (20) and received by the pair of base stations; - (53) estimating a differential measurement error according to the incoming frequencies of the calibration messages; - (54) estimating a difference in incoming frequency of the message of interest according to the incoming frequencies of the message of interest and according to the differential measurement error; - (55) estimating the movement of the terminal (20) of interest according to the difference in incoming frequency of the message of interest.
G01S 5/06 - Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
G01S 11/10 - Systems for determining distance or velocity not using reflection or reradiation using radio waves using Doppler effect
37.
ELECTRONIC APPARATUS COMPRISING AN ANTENNA STRUCTURE FOR SENDING AND/OR RECEIVING RADIOELECTRIC SIGNALS AND A STRAP SERVING TO FASTEN THE APPARATUS
Apparatus (100) comprising an antenna for sending and/or receiving radioelectric signals and a strap (104) serving to fasten the apparatus. The antenna comprises an antennal loop (200) and an antennal mass (302) bound together. The antennal loop includes a conducting plate (106) and a casing (108) containing an electronic circuit (400) and exhibiting at least one conducting face (202) which extends parallel opposite the conducting plate (106). The conducting plate (106) and the conducting face (202) of the casing are connected electrically (204) together on one side of the conducting face (202) of the casing and on the other side are connected electrically (110) with the electronic circuit (400). The antennal mass (302) comprises at least one conducting part (302) of the strap (104) in capacitive coupling with the conducting plate (106). Applications to connected watches and to geolocation collars for animals.
Method (200) of wireless communication between a plurality of terminals (LEP) and an access network (102) comprising a plurality of base stations (LAP). A terminal sends an upgoing message (U/L) in a sub-band (NX) of upgoing frequencies which is selected from among a plurality of sub-bands of upgoing frequencies, destined for the access network (102). To send downgoing messages (D/L), the access network 102 selects a sub-band (NX) of downgoing frequencies corresponding to the upgoing message (U/L), said sub-band of downgoing frequencies being selected from among a plurality of sub-bands of downgoing frequencies exhibiting frequency gaps of different values with the sub-bands of upgoing frequencies. One and the same base station (LAP) can send downgoing messages in parallel in respective and discontinuous sub-bands of downgoing frequencies destined for different terminals (LEP).
The present invention relates to a method (50) for assigning a terminal (20) to a base station (31) of an access network (30) comprising, when a base station, termed the "service base station" (31), receives a message from the terminal (20): - updating (51), by the service base station (31), a local assignment table by storing an identifier of said terminal (20) in said local assignment table; - assessing (52), by the access network (30), a predetermined mobility criterion of said terminal (20); - when said mobility criterion is verified: updating (53), by a base station (31) neighbouring the service base station and not having received the message from said terminal (20), a local assignment table by storing the identifier of said terminal (20) in said local assignment table of the neighbouring base station.
A method for associating a communicating object with at least one user. A remote server receives a signal requesting an association between an user identifier and an object identifier. The server verifies an authorization for the association between the object identifier and the user identifier, including verification of whether or not there is pre-existing association of the object identifier with at least one other user identifier. If association is authorized, the object identifier is associated with the user identifier in a database which can be accessed by the remote server. The database includes at least one user identifier list and one object identifier list.
G06F 15/16 - Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs
The present invention relates to a method (50) for correcting an error in the generation of a frequency by frequency synthesis means of a terminal (20) of a terrestrial wireless communication system (10), comprising: - transmitting (51) of a query message by the terminal (20), - estimating (52), by an access network (30), of the error in the generation of the frequency of the query message as a function of a theoretical transmission frequency of the query message by the terminal (20) and an actual frequency of reception of said query message by the access network (30), - transmitting (53), by the access network (30), of a response message comprising an item of correction information, - generating (54), by the frequency synthesis means of the terminal (20) and as a function of the item of correction information received by the access network (30), of a frequency of reception by the terminal of a broadcast signal transmitted by the access network.
This beacon (16A) for observing an object includes an observation unit (40) able to generate at least one observation datum, and a communicating unit (42) including an emitter (53) able to emit an observation signal corresponding to at least one generated observation datum. The observation signal is intended for a mobile machine able to collect the observation data and to emit ADS-B signals including an ADS-B-type message allowing this machine to be identified. The communication unit (42) furthermore includes a receiver (51) able to receive ADS-B signals issued from the mobile machine, and the communication unit (42) is configured to trigger the emission of the observation signal by the emitter (53) when at least one ADS-B signal is received by the receiver (51).
The present invention relates to a method (50) of sending, by a terminal (20) of a wireless communication system (10), a message on a communication channel shared with other terminals (20), said method (50) comprising: - before sending said message: a step (51) of listening without interruption to the communication channel by said terminal (20) until it detects an absence of activity on the communication channel for a predetermined time, termed the "inactivity time ∆Tin", - when no activity is detected on said communication channel for the inactivity time ∆Tin: a step (54) of waiting, for a predetermined time which is identical for all the terminals (20) of the wireless communication system (10), termed the "waiting time ∆Tat", - a step (52) of sending said message on the communication channel.
The present invention relates to a method of selection (50), by a terminal (20) of a wireless communication system (10), of a mode of communication to be used to exchange data with base stations (30) of said wireless communication system, said mode of communication being selected from among at least two different modes of communication associated with different respective geographical zones. Said method (50) comprises steps of: - (51) reception, by the terminal (20), of a monitoring message emitted by an aircraft (40), the monitoring message comprising an item of information on the position of said aircraft, - (52) estimation, by the terminal (20), of the geographical zone in which said terminal is situated, as a function of the aircraft position item of information extracted from said monitoring message received, - (53) selection of the mode of communication as a function of the estimated geographical zone of said terminal (20).
The present invention concerns a remote payment system (50), comprising: - a wireless access network (20), - a payment card (10) comprising a keyboard (13) on which an access code can be input, and a wireless communication module (14) suitable for exchanging data with the wireless access network (20) and for authenticating same with an authentication server (22) of said wireless access network, - a payment authorisation server (30) suitable for receiving a payment request transmitted by a transaction server (41) separate from the payment card (10), said payment authorisation server being configured to authorise said payment only when said payment authorisation server receives, via the authentication server (22), a correct input notification message transmitted by said payment card.
G06Q 20/32 - Payment architectures, schemes or protocols characterised by the use of specific devices using wireless devices
G06Q 20/34 - Payment architectures, schemes or protocols characterised by the use of specific devices using cards, e.g. integrated circuit [IC] cards or magnetic cards
G07F 7/08 - Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card
G06Q 20/02 - Payment architectures, schemes or protocols involving a neutral third party, e.g. certification authority, notary or trusted third party [TTP]
46.
METHOD FOR CONTROLLING, VIA A TERMINAL AND A SERVER, A SLEEP MODE OF A COMMUNICATION MODULE OF SAID TERMINAL
The present invention relates to a method (50) for controlling, via a terminal (20), a sleep mode of a first communication module (21) of said terminal (20), which communication module is suitable for exchanging data with a first wireless access network (31), said terminal (20) comprising a second communication module (22) suitable for exchanging data with a second wireless access network (32) and having a maximum data rate that is lower than a maximum data rate of said first communication module (21), said control method (50) comprising: when the first communication module (21) is in sleep mode, listening (53) to a downlink between the second wireless access network (32) and the terminal (20) by means of the second communication module (22); when the terminal (20) receives an activation request from the server (30) via the second communication module (22), activating (54) the first communication module (21).
The present invention concerns a method (50) for analysing frequency resources within a predetermined multiplexing band, comprising: - estimating (51), for at least one base station (31), capabilities to detect uplink messages in respectively different frequency sub-bands within the multiplexing band, - assessing (52), for each frequency sub-band, a predetermined service quality criterion depending on the detection capability estimated for said frequency sub-band, - transmitting (53) a spectral map of service quality for said base station (31), representative of the frequency sub-bands for which the service quality criterion has been verified and the frequency sub-bands for which said service quality criterion has not been verified.
The present invention relates to a method for determining the lag between the clocks of the base stations (31) of a communication network. The method (50) comprises steps in which: 51/ a remote terminal (20) transmits an upstream message to a central server (32); 52/ at least two base stations (31) of the communication network receive said upstream message; 53/ each of the base stations (31) that received the same upstream message timestamps the latter according to its own clock, and then transmits the message thus timestamped to the central server (32); 54/ the central server (32) collects all the messages timestamped by the base stations (31), extracts the timestamped messages comprising the same upstream message from the first terminal (20A), and determines the lags between said timestamped messages comprising said same upstream message, and deduces therefrom a lag between the clocks specific to the base stations that received said same upstream message.
The present invention relates to a method (50) allowing a receiver device (31) of a wireless communication system (10) to receive a useful signal emitted by an emitter device (20), said useful signal corresponding to a signal the phase or frequency of which is modulated by a sequence of two-state symbols corresponding to a sequence of binary data, including: detecting (51) a temporal envelope of the useful signal; comparing (52) the detected temporal envelope to a preset threshold value (S1); detecting (53) transitions between consecutive useful-signal symbols, on the basis of the result of the comparison; and, extracting (54) the sequence of binary data from the useful signal depending on the detected transitions.
The present invention concerns a method (50) for the transmission of a broadcast signal by an access network (30) to a plurality of terminals (20) of a two-way wireless communication system, said method comprising: - forming (51) an information signal SI1 from broadcast information intended for said terminals (20), - forming (52) a control signal SP, - transmitting (53) a broadcast signal comprising the information signal SI1 and the control signal SP, said information signal SI and said control signal SP being transmitted on different respective central frequencies 10 having a predefined frequency gap ΔF. The invention also concerns a method (60) suitable for receiving a broadcast signal.
H04W 4/00 - Services specially adapted for wireless communication networksFacilities therefor
H04W 4/06 - Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]Services to user groupsOne-way selective calling services
51.
CELLULAR ACCESS NETWORK INCLUDING A CELLULAR TERMINAL EMULATOR FOR INTERFACING WITH A LOW-BANDWIDTH ACCESS NETWORK
The present invention relates to a cellular access network (12) of a cellular wireless communication system (10), suitable for exchanging cellular data wirelessly with cellular terminals (11), said cellular access network being connected to a cellular network backbone (13). Said cellular access network includes means for interfacing with a low-bandwidth access network of a low-bandwidth wireless communication system (20), said low-bandwidth access network being capable of exchanging low-bandwidth data wirelessly with low-bandwidth terminals (21). Moreover, the interfacing means include at least one cellular terminal emulator, referred to as a "virtual server" (30), configured to exchange, via the cellular network backbone (13), low-bandwidth data between the low-bandwidth access network and a server (23) of the low-bandwidth wireless communication system (20).
The invention relates to a method (50) for the transmission of broadcast signals from a group of base stations (31) to terminals (20) of a wireless communication system (10), each base station comprising a coverage area. The coverage areas of the base stations of the group are distributed geographically such as to serve a geographical area. Since the broadcast signals are of limited duration and are transmitted in a frequency band used by all of the base stations of the group, the base stations (31) of the group are time-synchronised in relation to one another and the broadcast signals from the base stations (31) of the group are time-multiplexed. In addition, the wireless communication system (10) comprises multiple geographical regions, each including multiple groups of base stations (31), and the broadcast signals of different geographical regions are time-multiplexed.
The present invention concerns a method (50) for estimating an ability to detect, at a geographic site, messages transmitted in a frequency band, said detection ability being estimated depending on a measurement of an overall signal, at said geographic site, in said frequency band over a time window. Said method (50) comprises: - calculating (51) a spectrogram of the overall signal, - for at least one power level of the received messages, referred to as the "reference level": calculating (52) a maximum number ND of messages that can be positioned on the spectrogram without interference between same, in respective positions for which the reference level satisfies a predefined detection criterion relative to the power level of the overall signal in each position in question, - estimating (53) the detection ability for the reference level depending on the maximum number ND.
The present invention concerns a method (50) for transmitting, by a terminal (20) of a wireless communication system (10), uplink messages on an uplink to an access network (30), comprising steps of: - (51) forming a sequence of NR uplink messages, each uplink message of the sequence comprising a same useful data packet and control data comprising an identifier for identifying the uplink message from the NR uplink messages of the sequence, - (52) transmitting the uplink messages of the sequence on different respective centre frequencies. The present invention also concerns a method (60) for transmitting, by the access network (30), a downlink message in response to said sequence of uplink messages, on a centre frequency determined from the measured centre frequencies of the uplink messages of the sequence.
The invention relates to a wireless communication method (50) between a plurality of terminals (20) and an access network (30), said access network being designed to transmit downlink messages on a downlink in reply to uplink messages transmitted by the terminals, and the access network comprising a plurality of half-duplex base stations (31), each terminal waiting for a downlink message in reply to a transmitted uplink message being designed to listen to the downlink in a listening window, the duration of which is at least five times that of the downlink message. The method includes the steps of: - (51) determining if listening windows of terminals overlap, - and when an overlap allows the transmission of several downlink messages by a single base station: - (52) transmitting said downlink messages grouped together in a single transmission window of the base station.
The present invention relates to a method (50) for transmitting a downlink message on a downlink between an access network (30) and a plurality of terminals (20), the downlink message being made up of main data to be transmitted to a receiving terminal (20), the method (50) comprising the steps of: - (51) generating error detection data from the main data, - (52) modifying main data and/or error-detection data on the basis of an identifier of the receiving terminal (20), using a predefined reversible modification function, the modification being carried out at a constant spectral width and for a constant duration with respect to the aforementioned main data and/or error-detection data, and - (53) transmitting a downlink message comprising the main data and the error-detection data obtained after modification. The invention further relates to a suitable method (60) of receiving downlink messages.
The present invention relates to a method (50) of communication between an access network (30) and terminals (20), said access network comprising half-duplex base stations (31), in which, when a downgoing message is to be sent, in the course of a predetermined time interval, to a terminal that has sent an upgoing message received by several base stations, said method comprises steps of: - (52) obtaining of quantities, termed "reception loads", associated respectively with a group of base stations that have received the upgoing message sent by said terminal, each reception load being representative of a probability of reception, by the base station considered, of an upgoing message in the course of said time interval, - (53) selection, as a function of the reception loads obtained, of a base station from among the base stations of the group, - (54) sending of the downgoing message by the selected base station.
The invention relates to a method for associating a communicating object (4) with at least one user. Said method includes the following: - a remote server (1) receives (C) a signal for requesting an association between an identifier of the user, namely a "user identifier," and an identifier of the object, namely an "object identifier"; - the server (1) verifies (D) an authorization for the association between the object identifier and the user identifier, including verification of whether or not there is pre-existing association of the object identifier with at least one other user identifier; and if association is authorized - associating (E) the object identifier with the user identifier in a database (2) which can be accessed by the remote server (1). Said database (2) includes at least one user identifier list and one object identifier list.
Method for remote recovery by a terminal (10) of at least one authentication code required by a control terminal (30a, 30b, 30c), the method comprising: - identification (A) by a terminal (10) of control terminals (30a, 30b, 30c) located in a predefined geographic area; - sending (B) of a request by the terminal (10) to a remote server (20) according to a first communication protocol, said request being a demand for at least one authentication code corresponding to at least one of the control terminals selected from the identified control terminals (30a, 30b, 30c); - sending by the server (20) of the authentication code to the terminal (10) according to the first communication protocol; - sending (F) by the terminal of said authentication code corresponding to said selected control terminal, via a second communication protocol.
A method of searching for the presence of a useful signal of predefined spectral width ΔB in a multiplexing band having a spectral width greater than ΔB, includes calculating a frequency signal representative of a power spectral density in the multiplexing band, calculating a non-useful signal by filtering the frequency signal by means of a filter capable of suppressing all or part of signals having a spectral width equal to or smaller than ΔB, calculating a power ratio signal representative of the ratio of the frequency signal to the non-useful signal, and comparing the power ratio signal with a predefined threshold value. The method may be employed using a computer program product, a receiver unit, and/or a station of a digital telecommunications system comprising such a receiver unit.
09 - Scientific and electric apparatus and instruments
35 - Advertising and business services
38 - Telecommunications services
42 - Scientific, technological and industrial services, research and design
Goods & Services
Scientific (other than for medical use), nautical,
surveying, photographic, cinematographic, optical, weighing,
measuring, signaling, inspection, life-saving and teaching
apparatus and instruments; apparatus for broadcasting,
recording, transmitting or reproducing sound, data or
images; magnetic and electronic recording media; data
processing apparatus, computers, computer memories, modems,
magnetic tapes, facsimile machines, data magnetic or optical
media, electric cables, digital optical disks, computer
keyboards, printed circuits, printed circuit cards,smart
cards, electronic circuit cards, electronic identification
cards, software, software packages, computer terminals,
video screens, printers for use with computers, electronic
machines with a keyboard and/or screen, input or output
carriers, magnetic and optical discs; apparatus for
collecting, reading out, storing, converting, processing,
inputting, broadcasting, transmitting data, information and
signals; apparatus for the transmission of data and signals
by telephone, fax, telegraph, teletype, telex, cable,
satellite or any means of communication; telecommunication
and radio communication apparatus, mobile phones and fixed
telephones, answering machines; media for recording and
reproducing sound, images or signals; telecommunication
transmitters and receivers. Advertising, rental of advertising space; rental of
advertising time on all communication media; online
advertising on a computer network; commercial or industrial
management assistance; business management and organization
consultancy; marketing; compilation of information in
databases; statistical studies; file management;
administration, supervision of computer servers and
monitoring of the operation thereof; administration,
supervision and definition of telecommunications networks;
compilation of information in databases, services for
updating computer files; newspaper subscription services;
services for arranging subscriptions to telecommunication
services. Telecommunications, namely the transmission of information
accessible by any means of telecommunication; secure data
transmission services; communications by computer terminals,
communications by telephone; transmission of telephone,
television, radio information; transmission and reception of
information by telex, Internet, satellite, cable,
broadcasting, and by any means of communication;
transmission of messages and encoded images; data
transmission services, in particular packet transmission of
information and images, electronic mail and paging services,
mailing and transmission of dispatches, exchange of
computerized documents, electronic information exchanges;
telephone enquiry services for telecommunications, telephone
call transfer or telecommunications services; services for
transmitting replies on an online interactive electronic
service on a telecommunications network; electronic
information dissemination services for global communication
networks or private or restricted-access networks;
computer-assisted downloading and transmission of data,
messages and images; provision of access to a global
computer network; providing access to databases; provision
of access to search engines; electronic mail services on a
telecommunications network; rental of telecommunication
apparatus and installations; technical consulting and advice
in the field of telecommunications; transmission and
reception of data, signals, images and information processed
by computers or telecommunication apparatus; mobile
telecommunications network services; rental of access time
to a database server center. Rental of software; engineering services; computer
management services, services for technical operational and
supervisory assistance to computer networks; services for
technical operational and supervisory assistance to
telecommunication networks; computer programming, computer
rental; design of programs for data processing, duplication
of computer programs; rental of programs on computer media
and via all telecommunications means; design (development)
of computer systems and telecommunication systems; studies
and research in the field of operating telecommunications
networks; technical studies and research in the field of
maintenance, servicing, installation and repair of computer
and telecommunications hardware; code and format conversion
between different types of text; alternate data transfer
services; hosting of Internet sites; creation and
maintenance of web sites; research and development of new
products for companies; computer consulting services for the
maintenance of telecommunication networks; information
system consulting, advice on information system and
information technology analysis, advice on the design of
computer systems and networks; processing of signals, images
and information processed by computers or telecommunication
apparatus; engineering work; technical advice on the
operation of telecommunication networks.
62.
METHOD FOR TRANSMITTING USEFUL INFORMATION BETWEEN TWO TERMINALS AND METHOD FOR GENERATING AN ASSOCIATION TABLE USED IN THE CONTEXT OF THE TRANSMISSION
The invention relates to a method for transmitting useful information (15) between a transmitting terminal (10) and a receiving terminal (11) connected via a transmission channel (12), characterised in that the transmitting terminal (10) performs the steps of defining control information for the useful information (15); searching in an association table (20), which is accessible from the transmitting terminal (10), for a synchronisation word, referred to as a frame-synchronisation word, associated with the control information; generating a frame of data (17) from the useful information (15); and sending, over the transmission channel (12), a data stream (14) that includes the frame-synchronisation word and the frame of data.
The present invention relates to a method (50) for transmitting data via a terminal (10) to a station (20) of a digital telecommunications system, in which a first stream of data is encoded in data packets and a second stream of data is encoded in a frequency-hopping pattern, said data packets, in which the first stream of data is encoded, being consecutively transmitted in respective frequency bands of a frequency resource, said frequency bands being determined depending on said frequency-hopping pattern in which the second stream of data is encoded. The invention also relates to a method for adapted reception, as well as to a terminal and a station of a digital telecommunications system.
H04Q 9/00 - Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
H04L 5/00 - Arrangements affording multiple use of the transmission path
64.
METHOD FOR SEARCHING FOR A USEFUL SIGNAL IN A MULTIPLEXING BAND
The invention relates to a method (50) for searching for the presence of a useful signal having a pre-defined spectral width ∆B in a multiplexing band having a spectral width larger than ∆B, comprising steps of: (51) calculating a frequential signal representative of a spectral power density in the multiplexing band; (54) calculating a non-useful signal by filtering the frequential signal by means of a filter suitable for eliminating all or some of the signals having a spectral width equal to or less than ∆B; (56) calculating a power ratio signal representative of the ratio between the frequential signal and the non-useful signal; and (57) comparing the power ratio signal with a pre-defined threshold value. The invention also relates to a computer program product, a receiving unit, and a station (30) of a digital telecommunications system (10) comprising such a receiving unit.
The present invention relates to a method for authenticating data packets transmitted by terminals (10) and received by a station (20), each terminal (10) sequentially transmitting data packets in a plurality of different frequency bands according to a predefined sequence of frequency hops that is specific to said terminal, characterised in that it comprises, for a data packet received by the station (20), the steps of: i) measuring (51) the frequency band in which the data packet in question was received; ii) extracting (52) an identification code from said data packet in question; iii) determining (55) a theoretical frequency hop in accordance with the sequence of frequency hops associated with said identification code extracted from the data packet in question; and iv) calculating (56) a frequency hop deviation in accordance with the theoretical frequency hop and the frequency bands measured for the data packet in question and for the preceding data packet. The authentication method (50) comprises a step (58) of determining whether the data packets received sequentially with a single identification code were transmitted by the terminal (10) associated with said identification code in accordance with at least one frequency hop deviation.
The invention relates to a system for forming an asynchronous communication network for receiving client transmitters, comprising base stations that are remote from one another, said network enabling the geolocation of the client transmitters. For this purpose, the system comprises a plurality of stationary reference transmitters, the positions of which are known and each of which transmits a specific beacon signal in a frequency band included within the frequency band of the network. The geolocation of a client transmitter is carried out by multilateration by taking pairs of base stations into consideration, each pair consisting of base stations capable of receiving the signals from the client transmitter and the signals from a single reference transmitter, and by calculating the difference between the times the signal from the client transmitter arrived at the base stations, said difference being determined by calculating, for each base station, the difference between the times of arrival of the signal transmitted by the client transmitter and of that transmitted by the reference transmitter.
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinationsPosition-fixing by co-ordinating two or more distance determinations using radio waves
G01S 5/06 - Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements
67.
ACCESS NETWORK FOR DIGITAL TELECOMMUNICATIONS SYSTEM AND METHOD OF DIGITAL TELECOMMUNICATIONS
The present invention relates to an access network (30) for terminals (20) of a digital telecommunications system (10), said access network comprising base stations adapted for receiving radiofrequency signals emitted by said terminals, each terminal comprising a physical layer processing module adapted to form a radiofrequency signal on the basis of binary data in accordance with a predefined physical layer protocol. Moreover, for at least one base station, termed the "partial station" (31), an inverse physical layer processing, making it possible to extract binary data from a radiofrequency signal, is distributed between said partial station and a processing server (32) distinct from said partial station, an inverse physical layer processing module being made up of a first inverse processing module (310), integrated into said partial station, and a second inverse processing module (320), integrated into the processing server (32). The invention also relates to a method (50) of digital telecommunications.
H04B 7/02 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas
H04B 7/08 - Diversity systemsMulti-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
The invention relates to a method (30) for estimating frequency bias negatively affecting a digital signal representative of a symbol frame, wherein said method (30) comprises the steps of: (300) generating the digital signal at a sampling period Te that is shorter than a predefined period of each of the symbols of the frame; (302) calculating values for a plurality of pairs of samples of the digital signal, each value being representative of a phase difference between the samples of a pair; (304) estimating the frequency bias negatively affecting the digital signal on the basis of the values calculated for Np pairs of samples selected such that a plurality of said Np pairs belong strictly to a single symbol in the frame. The present invention also relates to a module (217) for implementing the estimation method (30), as well as to a telecommunication method (40) and system (1).
The present invention relates to a terminal (10) comprising means for transmitting data toward a station (20) in the form of radio signals, said radio signals being transmitted using a frequency resource (MC) shared between a plurality of terminals (10), characterized in that said terminal is configured to emit radio signals, the instantaneous frequency spectrum of which has a width (TOB) that is significantly less than a frequency drift of a frequency synthesis means of said terminal. The present invention also relates to a method for using a frequency resource, to a method for manufacturing terminals (10) and to a telecommunication system (1).
H04J 1/12 - Arrangements for reducing cross-talk between channels
G08C 15/02 - Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path simultaneously, i.e. using frequency division
