Abstract: A cooperative communications system comprising a source terminal, at least one relay terminal and a destination terminal. The system also comprises a distributed turbocoder over the source terminal and at least the relay terminal. The first part of the turbocoder residing on the source terminal and/or the second part of the turbocoder residing on the relay terminal is(are) equipped with a frequency scheduler (FSr,FSs) allocating the deeper-fading carriers to the systematic information data and the weaker-fading carriers to the parity data.

Abstract: The present invention relates to an asynchronous communication method in a wireless sensor network comprising a tree structure. For each node of the network, the communication is organized as a sequence of time frames, each frame including a listening phase possibly followed by a receiving phase and/or a transmitting phase. The method, of the preamble sampling type, enables a node to make a time appointment to its child node to transmit them a time window allocation message, each child node then transmitting at least one data packet in the window it has been allocated to. By minimizing the collision risk between packets and by maximizing the time during which the sensors go to sleep, the communication method both reduces the latency and the consumption within the network.

Abstract: The present invention relates a voice communication method between a plurality of users sharing the same transmission band. The resource is accessed by time division under the supervision of a control node. During a polling step, any user wishing to speak transmits (210) a request to the control node. The control node allocates (220) transmission frames to the requesting users or merely to some of these users. Users allocated a transmission frame can then transmit (230) a voice packet to the respectively allocated frames thereof. The transmission frames are interleaved temporally so as to give the impression of full-duplex communication during voice reproduction.

Abstract: The present invention relates to a centralised power allocation method in a wireless telecommunication system comprising at least a first couple of terminals, consisting of a first transmitting terminal and a first receiving terminal, and a second couple of terminals, consisting of a second transmitting terminal and a second receiving terminal. A control node partitions the interference diagram between the communication of the first couple and the communication of the second couple, into different areas, each area being associated to a type of processing of the interference. The control node calculates the minimum power curve for each communication in each said area. The power values to be allocated are given by the coordinates of the point of intersection of both curves in said diagram.

Abstract: The invention relates to a wireless telecommunication system including a transmitter and a receiver, said transmitter being used to transmit data packets to the receiver, said receiver including error detection means (220) in order to detect if a received packet contains errors, and further comprising means of outage detection (225) in order to determine, in the event an error packet is detected, if the transmission channel between the transmitter and the receiver is in an outage situation and in order to transmit a first (OUTAGE) signal indicating this situation, the transmitter being used to modify the conditions of transmission in response to said first signal.

Abstract: The present invention relates to a distributed method of power allocation in a wireless telecommunication system comprising at least a first couple of terminals, consisting of a first transmitting terminal and of a first receiving terminal, and of a second couple of terminals, consisting of a second transmitting terminal and a second receiving terminal. After a phase of initialization of the allocated powers (615), a plurality of iterations is carried out, each iteration comprising a first half-iteration (620, 630, 640), which is the task of the first couple, and a second half-iteration (650, 660, 670) which is the task of the second couple of terminals. Each half-iteration comprises a step (620) of estimation of the signal-to-noise and interference-to-noise ratios by the receiving terminal, a step (630, 640) of calculating the minimum output power compatible with the treatment of the interference, for the prescribed throughput of the call in question.

Abstract: The present invention relates to a communication method supervised by an interference classification. For two couples of transmitting and receiving terminals having communications using the same radio resources and interfering with each other, a partition of the interference diagram into a plurality of distinct zones is determined, each zone corresponding to a particular processing. For an operating point of the transmitting and receiving terminals, the zone in which this point is located is determined, and the processing associated with that zone is performed in at least one of the receiving terminals.

Abstract: A method for reporting a user channel quality in a wireless telecommunication system. The user channel includes a plurality of transmission resources such as, for example, frequency intervals of an OFDM multiplex. The user terminal determines the transmission resources which would be in an outage position for a transmission with a set point bit rate. The user terminal transmits on the uplink the list of resources which would be in an outage position as well as a channel quality indicator for resources which would not be.

Abstract: The present invention relates to a scheduling method in a multi-user communication system. Said method categorises packets from different users as urgent packets and non-urgent packets, assigns to urgent packets the transmission resources for obtaining the best link qualities by giving preference to the most urgent packets, assigns to non-urgent packets the remaining resources, and transmits each non-urgent packet with a transmission power lower than that which would be necessary for transmitting it with a maximum spectral efficiency, in view of the quality of service required on the link.

Abstract: The invention relates to a packet forwarding method in a cooperative network implementing a source terminal, a destination terminal, and at least one relay terminal. In case of a packet decoding error in a node of the network, this method, depending on the outage state of a direct or relayed channel between two nodes of the network, enables a determination of the node(s) having to perform retransmission of the packet and if applicable, the transmission resource(s) to be used.

Abstract: A method for controlling the transmission power of a terminal in a cellular telecommunications network, in which the number of transmission resources is greater than the number of users is disclosed. In one aspect, the number of additional transmission resources necessary for the communication of the user if a modulation and coding scheme with minimal spectral efficiency is used, and whether these resources are available, are determined, they are allocated to the user, and the transmission power of the terminal is set to the transmission power enabling the required quality of service to be obtained by using the predetermined modulation and coding scheme.

Abstract: A wireless OFDMA telecommunications system comprising a transmitter adapted to transmit, by means of an OFDM modulator, a plurality of data packets destined for receivers of a plurality of users, via the same plurality of transmission channels, the transmission channel of a user being associated with a group of sub-carriers of the OFDM multiplex and a set of OFDM symbol times of a transmission interval, each receiver being adapted to signal to the transmitter the loss of a packet transmitted over the transmission channel of the corresponding user, said transmitter further comprising a packet scheduler adapted to control retransmission of each packet lost by means of said modulator. Each receiver comprises detection means of an outage situation of the transmission channel of the corresponding user and signals this to said transmitter by means of an outage information (OUTAGE/NOUTAGE).

Abstract: The invention concerns a method to allocate transmission resources in a cell network of cooperative type. Each cell comprises a source, a receiver and optionally a half-duplex relay to relay data transmitted by the source to the receiver. The invention draws advantage from the half-duplex mode of a relay belonging to a cell, by allocating to the source of a neighbouring cell a resource used by this relay during one same transmission timeslot.

Abstract: A cooperative communications system comprising a source terminal, at least one relay terminal and a destination terminal. The system also comprises a distributed turbocoder over the source terminal and at least the relay terminal. The first part of the turbocoder residing on the source terminal and/or the second part of the turbocoder residing on the relay terminal is(are) equipped with a frequency scheduler (FSr,FSs) allocating the deeper-fading carriers to the systematic information data and the weaker-fading carriers to the parity data.

Abstract: The invention relates to a method of scheduling packets in a multi-access telecommunication system sharing a plurality of transmission resources. The packets relating to the various accesses are classed (110) in a first category of urgent packets (Qu) and in a second category of non-urgent packets (Qn—u). The packets of the first category form the subject of a first scheduling (120) and of an allocation of the said resources according to this first scheduling (125). The packets of the second category thereafter form the subject of a second scheduling (130) and of an allocation of the remaining resources, according to this second scheduling (135).

Abstract: The general field of the invention is that of hybrid telecommunication networks comprising at least one telecommunication relay-satellite emitting at least one signal covering a given geographical zone organized into sub-zones of smaller dimension, a terrestrial relay-station able to receive, to process the satellite signal and to emit a signal in at least one of the sub-zones and mobile reception terminals. The network according to the invention comprises first means making it possible to carry out a mapping of the quality of reception of the satellite signal in each sub-zone; second means making it possible to transmit the mapping information to the terrestrial relay-station. The relay-station comprises third means making it possible, as a function of the reception mapping information, to emit a signal dependent on the said mapping making it possible to improve the quality of reception in its reception sub-zone.

Abstract: This invention relates to a wireless telecommunication system receiver, comprising a demodulator (220, 230) adapted to demodulate a signal received from a source via a transmission channel to provide an error correction code word in the form of flexible or hard values, a decoder (240) adapted to decode said code word, characterised in that it further comprises decision means (250) adapted to receive an estimation of the fading coefficients of said channel during the transmission of said code word as well as an estimation of the noise variance or the signal to noise ratio, to deduce therefrom an estimation of the relative instantaneous mutual information to said channel, and to decide whether or not to inhibit the decoding of the code word by the decoder, according to whether the binary rate of transmission of the source is respectively greater than or less than a characteristic threshold of said instantaneous mutual information.

Abstract: The invention relates to a wireless telecommunication system including a transmitter and a receiver, said transmitter being used to transmit data packets to the receiver, said receiver including error detection means (220) in order to detect if a received packet contains errors, and further comprising means of outage detection (225) in order to determine, in the event an error packet is detected, if the transmission channel between the transmitter and the receiver is in an outage situation and in order to transmit a first (OUTAGE) signal indicating this situation, the transmitter being used to modify the conditions of transmission in response to said first signal.