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Inria Institut National De Recherche En Informatique Et En Automatique

Benoît Miscopein

Jean Schwoerer

Eric Batut

Jean-Baptiste Dore

Emilio Calvanese Strinati

Jean-Luc Danger

Apostolos Kountouris

Antonio De Domenico

Patrice Senn

Michel Pons

Frederic Evennou

Patrick Rosson

Mohamed Sana

David Demmer

Nicola Di Pietro

Francois Marx

Jean-Marie Gorce

Sami Mekki

François Marx

David Derrien

Simon Bicaïs

Ahmed Benfarah

Cedric Lauradoux

Cédric Lauradoux

A method for associating user equipment with base stations of a cellular network, in particular of a heterogeneous network such as a 5G network, uses a multi-agent reinforcement learning (MARL) algorithm. When a user equipment enters the network, the agent associated with this equipment downloads the instance of an association meta model to a coordinating unit, pre-trained by means of reinforcement learning. The agent subsequently constructs a local observation vector, comprising observables relating to the user equipment, and a global observation vector, including observables relating to the environment of this equipment. The local and global observation vectors are projected into the same reference space, the concatenation of the vectors thus projected encoding the state of the agent. It deduces from the model and from this state, an association decision. The model is updated according to a policy gradient method to consider evolution of the environment of the user.

Method of association of user equipment in a cellular network according to a transferable association policy

The present description concerns a method of processing by a radio transmitter/receiver () of a radio signal (SR) comprising a telecommunications signal disturbed by pulses of a radar signal, the method comprising the steps of: estimating the instantaneous power of the pulses, estimating the ratio of the average power of the telecommunications signal to the instantaneous power of the radar pulses, and modifying the radio signal at the locations of the radar pulses when said ratio is smaller than a threshold.

Processing method for a radio signal disturbed by a radar signal

This envelope-detecting circuit comprises:

Envelope-detecting circuit and receiver incorporating this circuit

A method for selection of unlicensed transmission resources to set up a communication between a base station, such as a base station of a small cell of a heterogeneous cellular network, and a mobile terminal. The transmission resource is selected coherently by the base station and the mobile terminal from transmission quality indices for these resources. The quality index of a resource is determined by the base station (or the mobile terminal) from the state of at least one first counter of the base station (or the mobile terminal) associated with this resource. The first counter of the base station associated with a selected resource is incremented if the selected resource is available. The first counter of the mobile terminal associated with a selected resource is incremented if it receives a beacon signal on the selected resource.

Method for dynamic selection of communication resources in a heterogeneous type cellular network

A method for processing a data packet before transmission over a radio communications network as a succession of waveforms transmitted at positions defined by hopping codes, which are time positions or frequency positions. The packet is transmitted over a communications channel of the network by a transmitter node to a destination node. The method includes the following steps performed for each bit of the data packet to be transmitted, referred to as the current bit: calculating a hopping code at least as a function of the value of the current bit and of an encryption key generated by a pseudo-random generator, the encryption key having size greater than the maximum size of a data packet transmitted over the channel; and causing a waveform to be transmitted at the position defined by the calculated hopping code, the transmitted waveform being identical regardless of the value of the current bit.

Method of processing a data packet before transmission over a radio communications network, a method of processing a received data packet, and associated devices and systems

A method of communicating between at least one event detector sensor and a collector of event detection data transmitted by the sensor in the form of an event signalling message whose modulation is defined by at least one spreading code. The method comprises the steps implemented by the sensor of, upon detection of an event, generation of data of event detection, of reception of a synchronization message emitted by the collector, the synchronization message comprising a seed for a pseudo-random generation of at least one spreading code and of pseudo-random generation of at least one spreading code on the basis of the seed. The method furthermore comprises a step of emitting an event signalling message whose modulation is defined by the at least one spreading code generated randomly, the event signalling message comprising the event detection data.

Protection against the detection of alert signals

A data transmitter is provided for transmitting data that makes it possible for nodes, relaying the preamble transmitted by a transmitter node, to also transmit data to a single destination node without, in turn, transmitting another preamble. In a network comprising a plurality of nodes that alternately observe sleeping and waking periods in an asynchronous manner relative to each other, a node receives a first preamble that is transmitted by at least one transmitter node. The first preamble comprises at least one first set of information related to transmission, by the transmitter node, of a first data set to a destination node. The adjacent node transmits a second data set to the destination node or to another node from the transmission of the first data set.

Method for transmitting a communication signal

A method and apparatus are provided for sending pulses from a sender device to a receiver device in a transmission channel. The pulses represent information symbols, with each of these pulses being associated with a time slot in a symbol time. The method includes a training step that is carried out before sending payload information and that includes sending a training sequence made up of two parts. A first part of the training sequence includes at least one pulse of energy that is greater than the energy of a pulse carrying payload information. There are a large number of time slots between the sending of the pulse and the sending of the next pulse. A second part of the training sequence includes a set of pulses known in advance and similar to the pulses used for carrying payload information, the energy of each of these pulses being equivalent to the energy of a pulse carrying payload information.

Method for sending pulses in a transmission channel

A method is provided for sending a communications signal in a communications network having a plurality of nodes assuming alternating sleeping and waking states and in which a sender node executes a step of sending an initial preamble, prior to sending data to a destination node. The method includes at least one operation of a neighbor node of the sender node relaying the initial preamble, where a relaying operation corresponds to sending a preamble formed from the preamble sent during the preceding relaying operation, the preamble sent during the first relaying operation being formed from the initial preamble, and the at least one relaying operation continuing until the destination node for the data detects the sent preamble.

Method of transmitting a communications signal

The invention relates to a method of measuring a distance between two radio-communication devices (), consisting in measuring a radio signal exchange delay. According to the invention, the time-of-flight of the signals is calculated from the exchange delay and subsequently corrected using an analysis of a single channel measuring frame that is transmitted between the two devices. The corrected time-of-flight corresponds to the shortest propagation path followed by the radio signals. In the majority of radio transmission medium configurations, the corrected time-of-flight is a straight line measurement of the distance separating the two devices ().

Method of measuring a distance between two radio-communication devices and device adapted to implement one such method

The invention relates to a method of implementing operations involving the processing a radio-communication frame (CMF) in a system comprising at least three radio transmitter/receiver devices (-), consisting in transmitting the frame in response to a first request signal (REQ) transmitted by a device belonging to the system (). According to the invention, the frame is processed in the device () that transmitted the first request signal (REQ) as well as in other devices belonging to the system (-) which transmitted respective request signals (REQ-REQ) within a pre-determined time period.

Processing of a radio-communication frame in a system comprising at least three radio transmitter/receiver devices

The invention relates to method and device for detecting propagation paths in pulse transmission, wherein a received signal comprises pulses on each time symbol. After synchronizing a pulse-based reception, the inventive method consists (A) in determining the arrival times of pulses of the same current time symbol, (B) in generating a path hypotheses by assigning an initial score to each dated pulse, (C) in determining the arrival times of pulses of the time symbol following the current symbol, (D) in relatively comparing the arrival times of pulses of the following time symbol with the arrival times of the path hypotheses and (E) in updating scores according to the relative comparison results. Said path detecting method is suitable for pulse information transmission, in particular in UWB.

Method for detecting paths in pulse transmission and a device for carrying out said method

Method for the detection of symbols by a receiver, each symbol (S, S) being transmitted from a transmitter in the form of a succession of pulses () representing a predetermined sequence of numerical values, the numerical values having respective nominal weights within each predetermined sequence. According to this method, a succession of pulses corresponding substantially to a symbol (S, S) transmitted from the transmitter is received at the receiver. A sequence of numerical values (S) corresponding to the said received succession of pulses is determined, the said numerical values having respective weights within the determined sequence. The received symbol is chosen as a function of the determined sequence of numerical values, the choice comprising a weighting of the numerical values of the determined sequence, chosen to re-establish the respective nominal weights of the said numerical values.

Method for the detection of symbols and associated receiver

The invention relates to a method for adjusting a pulse detection threshold consisting in detecting a pulse when the edge of said pulse envelop crosses the threshold, in allocating (A) a staring value (TH) to the threshold and in adjusting (B) the threshold (TH) in such a way that the number of pulses detected on at least one observation window (OW) satisfies a predetermined criterion in a determined time.

Method and device for adjusting a pulse detection threshold, and pulse detection and corresponding receiver

A method for the synchronization of a radio receiver, comprising an estimation of the moment when a pulse () is received (), performed from the moment when a previous pulse was received. The estimated moment is compared with the real moment when the pulse () is received in order to validate an association of pulses with values of a code recorded in the receiver (). A moment for the beginning of transmission of a symbol is thus deduced, enabling the receiver to be synchronized in relation to the transmitted radio pulse sequence.

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Grenoble, France

Benoît Miscopein