Abstract: An error correction encoding method is provided for encoding in parallel source digital data, having the form of a frame, wherein said data can be classified into N classes, where N is an integer at least equal to 2. The encoding method includes: a first recursive systematic convolutional encoding step of data to be encoded, formed by the data of the class 1; and an implementation of the following steps, for each n ranging from 1 to M, where M is a positive integer equal to or lower than N?1: nth mixing of a set formed by the data of the class n+1 and the systematic data of the preceding encoding; and (n+1)th recursive systematic convolutional encoding of data to be encoded, formed by the result of the nth mixing. Also disclosed is a related decoding method, as well as an associated encoding and decoding devices.

Abstract: The present invention relates to an error correction encoding method for encoding so-called source digital data, having the form of a frame, wherein said data can be classified into N classes, where N is an integer at least equal to 2. The encoding method according to the invention comprises: a first step of recursive systematic convolutional encoding of the data of the class 1; an implementation of the following steps, for each n ranging from 1 to M, where M is a positive integer equal to or lower than N?1: nth mixing (108n+1) of a set formed by data of the class n+1 (102n+1), the systematic data and the parity data from a preceding encoding step; (n+1)th recursive systematic convolutional encoding (110n+1) of data formed by the result of nth mixing. The invention also relates to a method for decoding encoded data with the encoding method according to the invention, as well as associated encoding device and decoding device.

Abstract: An error correction encoding method is provided for encoding source digital data having the form of a frame, wherein the data can be classified into a plurality of classes. The present encoding method includes the following steps: a first encoding step for encoding data to be encoded formed by the data of a first class, to obtain encoded data; and implementing the following step successively for at least one other class: mixing data of the other class and the data encoded or to be encoded from a preceding encoding step; and encoding data to be encoded formed by mixed data to obtain encoded data. Related decoding methods, as well as encoding and decoding devices are also disclosed.

Abstract: In order to acquire first subbands in at least a central band of a broad frequency band, in which subbands frames are transmitted by a base station (BSBB) of a broadband network (RBB) which is co-located with a network (RNB) having narrow subbands comprised in the broadband, a mobile (MBBB) which does not know the distribution of the subbands correlates subsequences of a generated reference signal with subsequences which are respectively detected in the subbands and compares correlation coefficients against a threshold. By knowing the distribution of the first subbands, the mobile is able to process the signalling transmitted by the base station, in order to access allocated resources, after a synchronisation phase.

Abstract: A method for attaching a user terminal to a packet network via a meshed radiocommunications network infrastructure includes selecting a host packet network dedicated to at least a category of users to which a user terminal belongs based on a second user identification code of the meshed network and/or access information pertaining to rights for attachment of user terminals to at least one packet network. The method finds an application in all types of infrastructure of meshed radiocommunications networks and finds a particularly interesting application in the case of PMR type professional radiocommunications networks.

Abstract: For clipping a signal with respect to a clipping threshold (Amax), a signal portion above the clipping threshold and a peak (Pk) in the signal portion are detected, a clipping function depending on end times (ts, te) of the signal portion, the amplitude of the detected peak and the clipping threshold is derived, and the signal portion is clipped by multiplying it by the clipping function. The first portion can be enlarged up to the lowest boundary points (t1+1, t2?1) on the first ascending portion and the last descending portion of the detected peak. Spectral leakage in the sidebands out to the frequency band of the clipped signal is eliminated by a filtering device. The filtered dipped signal to the input of the amplifier has peaks as dose to the saturation threshold of a power amplifier as possible.

Abstract: A method is presented for distributing cryptographic keys in a hierarchized network including at least one device in charge of a higher group of devices, wherein at least one of the devices of the higher group of devices is also in charge of a lower group of devices. The method includes the steps of: a) storing a set of identifiers particular to the higher group, an identifier particular to the device in charge, an identifier per device in charge of a lower group, each identifier being unique; storing a root cryptographic key; c) providing a root cryptographic key to each device in charge of a lower group using a first non-reversible cryptographic function; d) providing at least one transport cryptographic key to each member of said higher group of devices using a second non-reversible cryptographic function.

Abstract: A method for managing a degraded mode of a cell of a cellular network including a site controller for controlling, via a packet network, transmitters distributed over various sites of the cell such that transmitters implementing the same pair of frequencies over different sites form a channel which, in dynamic mode, is allocated dynamically to any communication between terminals of the cell, the channel including a master transmitter selected by the controller. The method includes, in each master transmitter on detection of a failure of the controller: switching in degraded mode of the master transmitter, by associating with the channel a predefined communication known to the terminals, and transmission from the master transmitter, via the network, of a control message informing a control console connected to the packet network of the implementation of the degraded mode so that the console participates in a communication underway in the channel.

Abstract: The invention concerns a method for scheduling frequency channels implemented in a device for a narrowband radiocommunication system sharing with a broadband radiocommunication system, each comprising a narrowband base station and a broadband base station, and the same frequency band, the frequency band being in part divided into a given number of frequency blocks, each comprising a given number of carrier frequencies to optionally be allocated to the narrowband base stations.

Abstract: A method for producing a proof of the presence and/or of the availability of an entity in a site over a period that is greater than or equal to a presence threshold, the method including: successively transmitting messages, the messages being generated from a secret such that the secret may be reconstituted by having the knowledge of a given number of messages that is greater than or equal to a threshold, each message being transmitted over a transmission period whose duration is chosen such that the product of the duration of the transmission period times the threshold is substantially equal to the presence threshold; comparing the secret and a secret candidate generated from messages received by the entity; the proof being produced only if the secret and the secret candidate are equal.

Abstract: A method for centralizing events for a multilevel hierarchical computer management system, the system including a plurality of source equipments generating events and a plurality of event collectors per level, the method including selecting by an upper level collector a lower level collector according to operational parameters and/or a link quality of service of the lower level collector; receiving by the collector the events from the selected lower level collector; periodically verifying if the selected collector is available and if not repeating the selection step; and comparing by the upper level collector its events with those from the unselected lower level collectors and receiving from one of these unselected lower level collectors the events that are different.

Abstract: A method for identifying a host-type radiocommunications network of a user terminal from at least two networks forming a radiocommunications infrastructure including a base station shared by the networks, and a network core for each of the networks. A beneficial application of the method lies within the field of professional mobile radiocommunications networks.

Abstract: A workstation with position memory includes a stationary flat mounting, a plate translatably mounted relative to the stationary flat mounting and a locking system secured to the plate. The workstation also includes a fastener secured to the stationary flat mounting, a strap including a first end, an intermediate portion and a second end, the first end being attached to the fastener and the second end being free from any strain. The locking system has a first open position in which the locking system can slide along the intermediate portion and a second closed position in which the locking system is retained in a locked position along the intermediate portion. The invention has a direct application in the field of military vehicles.

Abstract: For supervising the security of a computer system (SY) comprising several elementary computer items (BI), such as machines and applications, and several gathering items (BIg), such as networks, services or sites, gathering elementary items, a supervision device (DS) collects base measurements (MB) representative of states of the elementary items. A unit (UDI) determines several security indicators (I) of different types for each elementary item according to respective functions of the base measurements and several security indicators of different types for each gathering item. Each security indicator of a given type of a gathering item is determined according to a respective function of the security indicators of the given type of the elementary items gathered in the gathering item. The indicators of one item relate to the availability, the intrusion, the vulnerability and the compliance to a security policy.

Abstract: A method of configuring modules for identifying users of a telecommunication network able to cover a service area cut into a plurality of geographical sub areas, each identification module including an identification code stored in the identification module, the identification code including: an operator identifier; a user identification number; the method including assigning at least one operator identifier to each geographical sub area, the operator identifiers of two contiguous geographical sub areas being different and at least two non-contiguous geographical sub areas having an identical operator identifier.

Abstract: A method of configuring modules for identifying users of a telecommunication network able to cover a service area, each identification module including an identification code stored in the identification module, the identification code including: an operator identifier; a user identification number; the method includes assigning a same operator identifier to a plurality of modules for identifying users belonging to a same organization or international mission.

Abstract: A method of configuring modules for identifying users of a telecommunication network able to cover a service area cut into a plurality of geographical sub areas, each identification module including an identification code stored in the module, the identification code including:—an operator identifier;—a user identification number; the method including assigning a part of the user identification number to the operator, the part being used for purposes other than identification of the user.

Abstract: Radio blocs (BRjp) shared in a predetermined frequency band during a periodic radio frame (TRi) between base stations (BS) are allocated to applications in base stations and mobile stations. Each radio block spreading on frequencies (Cj) of said band during a time slot (M?t) of the radio frame and can be associated with an uplink or a downlink. To meet quality-of-service parameters required by an application, a base station estimates occupation rates of the radio blocks during consecutive radio frames, and allocates to the application at least one radio block having an occupation rate less than a threshold and a periodicity expressed in period of frame and depending on the required quality-of-service parameters. The base station are autonomous for the radio block allocations.

Abstract: A method of managing a cell of a radio telecommunication network, the cell including a site controller to control, via a packet network, a plurality of transmitters distributed over different sites of the cell such that the transmitters of the different sites transmitting over a same frequency band form a transmission channel, a channel of the transmission channel being a control channel dedicated to a transmission of signals relative to an operation of the cell, the signals including general operating signals and specific operating signals, the method including: transmitting a request comprising general operating signals from the site controller to a transmitter selected by said site controller to control storage of general operating signals in the selected transmitter, and to control handling of a transmission of the general operating signals addressed to all terminals present in the cell over the control channel in case of failure of the site controller and/or of the packet network.

Abstract: A method of management for operating a first system of communication of the broadband type communication system emitting over a first frequency range, and a second system of communication of the narrow band type communication system emitting over a second frequency range, the first system and the second system using all or part of a same frequency band, such common frequency band being called a crossover frequency band for both systems, the method including: embodying a scan operation from at least the crossover frequency band of the two systems using a scan device from the first communication system; identifying, after the scan operation, the frequency channels used by the second communication system; adapting the operating of the first communication system within the frequency channels identified as being used by the second communication system.