Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Commissariat a L'energie Atomique

Dimitri Ktenas

Emilio Calvanese Strinati

Luc Maret

Mathieu Bouvier Des Noes

Mathieu Des Noes

Antonio De Domenico

Valentin Savin

Chiara Martinelli-Cattaneo

Julien Barletta

Claire Guyon

Youssef Nasser

Ioan-Sorin Comsa

The invention relates to a method for scheduling packets belonging to a plurality of data flow categories in a multi-access telecommunication system sharing a plurality of transmission resources. The method comprises at each transmission time interval, selecting, by a planner (CT, CF) a resource allocation plan and allocating the transmission resources to the data flows in accordance with the selected resource allocation plan. This selection is made by querying a look-up table (LUT) the content of which results from the implementation of a reinforcement learning and which makes it possible to identify, from the current state of the multi-access telecommunication system (s[t)]), the resource allocation plan to be selected, this plan being optimum to fulfil heterogeneous needs in terms of quality of service.

Method for allocating transmission resources using reinforcement learning

The invention proposes a method for the transmission of data in a cooperative network comprising a source terminal (S), a destination terminal (D) and a relay terminal (R), comprising:

Cooperative communication system with adaptive packet retransmission strategy

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.

Cooperative network with adaptive forwarding request policy

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.

Method for reporting a transmission channel quality

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). In the event of outage, said scheduler prohibits any retransmission of a packet lost over said channel during a predetermined time (T) greater than or equal to the coherence time of said channel.

Multi-access telecommunications system with adapted strategy for packet retransmission

The invention relates to an iterative method by message passing for decoding of an error correction code that can be displayed in a bipartite graph comprising a plurality of variable nodes and a plurality of check nodes. For each iteration in a plurality of decoding iterations of said method: The invention also relates to a computer program designed to implement said decoding method.

Method of decoding by message passing with scheduling depending on neighbourhood reliability

A method for soft demapping of complex-valued symbols y(k) (k=1, 2, . . . , K) by calculation of a Logarithm of Likelihood Ratio (LogLR) such that: wherein bI,q is the qcoded bit of an in-phase part of a transmitted signal, &#x3b2; is an asymptotic Signal-to-Interference-plus-Noise Ratio, {tilde over (y)}(k) is a standardized symbol associated with y(k), &#x3bb; is a reference symbol of QAM constellation associated with a M-QAM modulation, SI,q and SI,q are complex plane partitions that bring together, respectively, all reference symbols &#x3bb; having a '1' at the position (I, q) and all reference symbols &#x3bb; having a '0' at the position (I, q), a formula similar to LogLR being given for the bit bQ,p, pcoded bit of a quadrature part of the transmitted signal. The method applies to code division multiple access transmission systems.

Method for the flexible demodulation of estimated complex symbols

This method for carrying out the flexible demodulation of data modulated following an amplitude modulation in quadrature is used in a communications system employing a code division multiple access technique (CDMA) and an optical frequency division multiplexing (OFDM) using non-binary spread codes. The invention includes steps for determining a simplified expression specific to the logarithm of the likelihood ratio.

Method and device for carrying out flexible demodulation in an OFDM-CDMA system

A method of estimating an SINR ratio of an OFDM-CDMA transmission signal spread with spread codes, the transmission signal being transmitted between a transmission apparatus and a receiver apparatus, the method including: receiving the signal spread with spread codes at the receiver apparatus; and calculating, with a processor at the receiver apparatus, an estimate of the SINR ratio for the signal spread with the spread codes independently of a value of the spread codes.

Estimation of a signal-to-interference plus noise ratio at the output of an OFDM CDMA receiver

To select the frequency (S) and/or time (S) spreading parameters for a communication system using a quadrature amplitude modulation and implementing a CDMA technique and an OFDM multiplexing the attenuation coefficients of the propagation channel are estimated For all the F sub-bands of Ssubcarriers and the T blocks of SOFDM symbols, at least one asymptotic signal-to-interference+noise ratio (SINR) is determined, based on the attenuation coefficients of the propagation channel and the type of equalizer used by the receiver. From this, for each coded information block obtained from the modulation, the compressed asymptotic SINR is deduced, expressed by an analytical formula dependent on the frequency (S) and time (S) spreading parameters and the frequency (S) and time (S) spreading parameters which maximize the value of the compressed asymptotic SINR are selected.

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Fontaine, France

Dimitri Ktenas