摘要:
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.
摘要:
The invention relates to a data packet transmission process in a communication system comprising at least one terminal (UE) communicating with a base station (BS), the process comprising at least one transmission (S4) of the data packet with a given power, from the terminal to the base station based on a HARQ scheme to obtain a residual packet error rate PERres after a number of transmissions Trn, the process being characterised in that it comprises a step (S) for the joint selection of the following parameters: the number of transmissions Trn; the target packet error rate PERtg(i) of each transmission i, where i=1, . . . , Trn, to arrive at the residual packet error rate PERres; and the modulation and coding scheme m corresponding to each target packet error rate PERtg(i) so as to minimise the data packet transmission power.
摘要:
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.
摘要:
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.
摘要:
The present invention relates to a centralized 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.
摘要:
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 (Tout) greater than or equal to the coherence time of said channel.
摘要:
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.
摘要:
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.
摘要:
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).
摘要:
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.