WO2019048027A1 - Nœud de réseau, premier dispositif client, second dispositif client et procédés associés - Google Patents

Nœud de réseau, premier dispositif client, second dispositif client et procédés associés Download PDF

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Publication number
WO2019048027A1
WO2019048027A1 PCT/EP2017/072255 EP2017072255W WO2019048027A1 WO 2019048027 A1 WO2019048027 A1 WO 2019048027A1 EP 2017072255 W EP2017072255 W EP 2017072255W WO 2019048027 A1 WO2019048027 A1 WO 2019048027A1
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WIPO (PCT)
Prior art keywords
message
communication signal
client device
sub
network node
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PCT/EP2017/072255
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English (en)
Inventor
Alberto Giuseppe PEROTTI
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Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to PCT/EP2017/072255 priority Critical patent/WO2019048027A1/fr
Publication of WO2019048027A1 publication Critical patent/WO2019048027A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0097—Relays

Definitions

  • the invention relates to a network node, a first client device, and a second client device. Furthermore, the invention also relates to corresponding methods and a computer program.
  • OMA schemes are widely adopted in current wireless communication standards, as they relieve the UE receiver of the burden of removing inter-UE interference.
  • NOMA non-orthogonal MA
  • An objective of implementation forms of the invention is to provide a solution which mitigates or solves the drawbacks and problems of conventional solutions.
  • the network node is further configured to
  • An advantage with this implementation form is that, as concatenation is performed before encoding, the channel encoder operates on a longer block. Thereby, better error correction is provided.
  • the network node is further configured to
  • the network node is further configured to
  • An advantage with this implementation form is that the network node can provide the receiver of the first client device with necessary control information in order to allow easier detection, demodulation and decoding of the received signal.
  • the network node can provide the receiver of the second client device with necessary control information related to the transmission of the first sub-message to the second client device. Thereby, enabling the second client device to receive the part of its message, i.e. the first sub-message, that was previously delivered to the first client device.
  • a first client device for a wireless communication system the first client device being configured to receive a first superposed communication signal from a network node, the first superposed communication signal comprising a first communication signal and a second communication signal, wherein the first communication signal comprises a first message and a first sub-message and the second communication signal comprises a second sub-message, wherein the first sub-message is addressed for the second client device via the first client device;
  • the first control signal comprises a first control information associated with the transmission of the first superposed communication signal from the network node
  • the first client device is further configured to
  • the third control signal comprising a third control information associated with the transmission of the first sub-message to the second client device
  • the first client device may receive the first sub-message via the second client device, thereby allowing the first client device to exploit the channel quality of the second radio link between the network node and the second client device.
  • splitting the second message into a first sub-message and a second sub-message, wherein the first sub-message is addressed for the second client device via the first client device;
  • an implementation form of the method comprises the feature(s) of the corresponding implementation form of the network node.
  • the above mentioned and other objectives are achieved with a method for a first client device, the method comprises
  • the first superposed communication signal comprising a first communication signal and a second communication signal, wherein the first communication signal comprises a first message and a first sub-message and the second communication signal comprises a second sub-message, wherein the first sub-message is addressed for the second client device via the first client device;
  • an implementation form of the method comprises the feature(s) of the corresponding implementation form of the first client device.
  • the invention also relates to a computer program, characterized in code means, which when run by processing means causes said processing means to execute any method according to the present invention. Further, the invention also relates to a computer program product comprising a computer readable medium and said mentioned computer program, wherein said computer program is included in the computer readable medium, and comprises of one or more from the group: ROM (Read-Only Memory), PROM (Programmable ROM), EPROM (Erasable PROM), Flash memory, EEPROM (Electrically EPROM) and hard disk drive.
  • ROM Read-Only Memory
  • PROM Programmable ROM
  • EPROM Erasable PROM
  • Flash memory Flash memory
  • EEPROM Electrically EPROM
  • - Fig. 1 shows a network node according to an implementation form of the invention
  • - Fig. 2 shows a method according to an implementation form of the invention
  • FIG. 3 shows a client device according to an implementation form of the invention
  • FIG. 4 shows a method according to an implementation form of the invention
  • FIG. 6 shows a transmitter block scheme for a network node according to an implementation form of the invention
  • Fig. 7 shows a receiver block scheme for a first client device according to an implementation form of the invention
  • FIG. 8 shows a receiver block scheme for a second client device according to an implementation form of the invention
  • - Fig. 9 shows a transmitter block scheme for a network node according to an implementation form of the invention
  • Fig. 10 shows a receiver block scheme for a first client device according to an implementation form of the invention
  • FIG. 1 1 shows a signalling diagram according to an implementation form of the invention
  • - Fig. 12 shows data rate regions for different transmission schemes.
  • Fig. 1 shows a network node 100 according to an implementation form of the invention.
  • the network node 100 comprises a processor 102, a transceiver 104 and a memory 106.
  • the processor 102 is coupled to the transceiver 104 and the memory 106 by communication means 108 known in the art.
  • the network node 100 may be configured for both wireless and wired communications in wireless and wired communication systems, respectively.
  • the wireless communication capability is provided with an antenna 1 10 coupled to the transceiver 104, while the wired communication capability is provided with a wired communication interface 1 12 coupled to the transceiver 104.
  • the network node 100 is configured to perform certain actions should in this disclosure be understood to mean that the network node 100 comprises suitable means, such as e.g. the processor 102 and the transceiver 104, configured to perform said actions.
  • the network node 100 is configured to obtain a first message M1 addressed for a first client device 300a and obtain a second message M2 addressed for a second client device 300b.
  • the network node 100 is further configured to split the second message M2 into a first sub- message SM1 and a second sub-message SM2.
  • the first sub-message SM1 is addressed for the second client device 300b via the first client device 300a.
  • the network node 100 is configured to generate a first communication signal CS1 comprising the first message M1 and the first sub-message SM1 and generate a second communication signal CS2 comprising the second sub-message SM2.
  • the network node 100 is further configured to combine the first communication signal CS1 and second communication signal CS2 into a superposed communication signal SCS and transmit the superposed communication signal SCS concurrently to the first client device 300a and the second client device 300b.
  • Fig. 2 shows a flow chart of a corresponding method 200 which may be executed in a network node 100, such as the one shown in Fig. 1 .
  • the method 200 comprises obtaining 202 a first message M1 addressed for a first client device 300a and obtaining 204 a second message M2 addressed for a second client device 300b.
  • the method 200 further comprises splitting 206 the second message M2 into a first sub-message SM1 and a second sub-message SM2.
  • the first sub-message SM1 is addressed for the second client device 300b via the first client device 300a.
  • the method 200 comprises generating 208 a first communication signal CS1 comprising the first message M1 and the first sub-message SM1 and generating 210 a second communication signal CS2 comprising the second sub-message SM2.
  • the method 200 further comprises combining 212 the first communication signal CS1 and second communication signal CS2 into a superposed communication signal SCS and transmitting 214 the superposed communication signal SCS concurrently to the first client device 300a and the second client device 300b.
  • Fig. 3 shows a client device 300a; 300b according to an implementation form of the invention.
  • the client device 300a; 300b comprises a processor 302, a transceiver 304 and a memory 306.
  • the processor 302 is coupled to the transceiver 304 and the memory 306 by communication means 308 known in the art.
  • the client device 300a; 300b further comprises an antenna 310 coupled to the transceiver 304, which means that the client device 300a; 300b is configured for wireless communications in a wireless communication system.
  • client device 300a; 300b is configured to perform certain actions should in this disclosure be understood to mean that the client device 300a; 300b comprises suitable means, such as e.g. the processor 302 and the transceiver 304, configured to perform said actions.
  • a first client device 300a is configured to receive a first superposed communication signal SCSI from a network node 100, the first superposed communication signal SCSI comprising a first communication signal CS1 and a second communication signal CS2.
  • the first communication signal CS1 comprises a first message M1 and a first sub-message SM1 and the second communication signal CS2 comprises a second sub-message SM2.
  • the first sub- message SM1 is addressed for the second client device 300b via the first client device 300a.
  • the first client device 300a is further configured to interference cancel the second communication signal CS2 in the first superposed communication signal SCSI and derive the first sub-message SM1 from the interference cancelled first superposed communication signal SCSI .
  • the first client device 300a is configured to generate a third communication signal CS3 comprising the first sub-message SM1 and transmit the third communication signal CS3 to the second client device 300b.
  • Fig. 4 shows a flow chart of a corresponding method 400 which may be executed in a first client device 300a, such as the one shown in Fig. 3.
  • the method 400 comprises receiving 402 a first superposed communication signal SCSI from a network node 100, the first superposed communication signal SCSI comprising a first communication signal CS1 and a second communication signal CS2.
  • the first communication signal CS1 comprises a first message M1 and a first sub-message SM1 and the second communication signal CS2 comprises a second sub-message SM2.
  • Fig. 5 shows a wireless communication system 500 according to an implementation.
  • the wireless communication system 500 comprises a network node 100, a first client device 300a, and a second client device 300b, all configured to operate in the wireless communication system 500.
  • communication signals such as e.g. superposed communication signals SCSs, are transmitted by the network node 100 and received by the first client device 300a and the second client device 300b.
  • the communication signals are transmitted from the network node 100 to the first client device 300a over a first radio channel 502, and from the network node 100 to the second client device 300b over a second radio channel 504.
  • communication signals such as e.g. third communication signals CS3s, are transmitted from the first client device 300a to the second client device 300b over a third radio channel 506.
  • the wireless communication system 500 shown in Fig. 5 only comprises one network node 100, one first client device 300a, and one second client device 300b.
  • the wireless communication system 500 may comprise any number of network nodes 100, first client devices 300a and second client devices 300b without deviating from the scope of the invention.
  • the network node 100 splits the obtained second message M2 into a first sub-message SM1 and a second sub-message SM2.
  • the network node 100 may determine how to split the second message M2, i.e. the size of the first sub-message SM1 and the size of the second sub-message SM2, based on its knowledge of the channel quality of the first radio channel 502 and the second radio channel 504.
  • Channel qualities are usually estimated/computed by each client device 300a, 300b based on the reception of reference signals from the network node 100.
  • the estimated channel quality is then reported to the network node 100 by the client device 300a; 300b through a feedback control channel.
  • the network node 100 may determine the data message sizes for the client device 300a; 300b based on the reported channel qualities and on pre-determined message sizes contained in look-up tables.
  • the values contained in those look-up tables may be generated by simulation according to the general principle that a set of time-frequency resources of a given size having a high channel quality can accommodate transmission of a larger data message than another set of time-frequency resources of the same size having lower channel quality.
  • the network node 100 may be configured to split the second message M2 into the first sub-message SM1 and the second sub-message SM2 based on a first channel quality measure CQM1 associated with the first radio channel 502 from the network node 100 to the first client device 300a; and a second channel quality measure CQM2 associated with the second radio channel 504 from the network node 100 to the second client device 300b.
  • a first channel quality measure CQM1 associated with the first radio channel 502 from the network node 100 to the first client device 300a
  • a second channel quality measure CQM2 associated with the second radio channel 504 from the network node 100 to the second client device 300b.
  • the size of the first sub-message SM1 should be large.
  • the high channel quality associated with the first radio channel 502 may be used to improve the data rate towards the second client device 300b.
  • the second channel quality measure CQM2 is very low, e.g. below a threshold level, the second message M2 may not be split at all.
  • conventional relaying may instead be performed such that the whole second message M2 is sent to the first client device 300a and then relayed by the first client device 300a to the second client device 300b over the third radio channel 506.
  • the channel quality of the third radio channel 506 may be considered by the network node 100 when splitting the second message M2.
  • the network node 100 may obtain knowledge about the channel quality of the third radio channel 506 e.g. from reports from the first client device 300a and/or the second client device 300b.
  • the network node 100 may be configured to split the second message M2 into the first sub-message SM1 and the second sub-message SM2 further based on a third channel quality measure CQM3 associated with a third radio channel 506 from the first client device 300a to the second client device 300b.
  • the third channel quality measure CQM3 associated with the third radio channel 506 is very low, e.g.
  • the second message M2 may not be split at all. In such a scenario, no relaying is performed, instead the whole second message M2 is sent directly from the network node 100 to the second client device 300b.
  • further parameters may be considered by the network node 100 when splitting the second message M2. For example, the network node 100 may consider whether the first client device 300a and the second client device 300b has enough available time-frequency resources and/or enough transmission power to be allocated for transmission between each other. In addition, the network node 100 may consider whether transmissions between other client devices are ongoing in the same time-frequency resources and in the same network area and refrain from scheduling a transmission from the first client device 300a to the second client device 300b in order to minimize interference to those other client devices.
  • the encoding and modulation is performed by an encoder 606 and a modulator 608, respectively.
  • the second sub-message SM2 is passed through an encoder 610 and a modulator 612 which encodes and modulates the second sub-message SM2 to obtain a second communication signal CS2.
  • the first communication signal CS1 and second communication signal CS2 are scaled and superposed according to the transmitter scheme 600.
  • a power ratio 1 - a of the total transmission power P is assigned to the first communication signal CS1 at a first multiplier 616, while a ratio a of the total transmission power P is assigned to the second communication signal CS2 at a second multiplier 618.
  • the scaled first communication signal CS1 and the scaled second communication signal CS2 are thereafter combined by a combining function 620 into a superposed communication signal SCS.
  • the superposed communication signal SCS is mapped to REs by a downlink RE mapper (not shown in Fig. 6) and concurrently transmitted to the first client device 300a and the second client device 300b.
  • Fig. 7 shows a receiver block scheme 700 for a first client device 300a corresponding to the transmitter block scheme 600 shown in Fig. 6, i.e. the receiver block scheme 700 is configured to enable reception, decoding, and demodulation of the superposed communication signal SCS generated by the transmitter block scheme 600.
  • the first client device 300a receives the superposed communication signal SCS and demodulates and decodes the superposed communication signal SCS in a demodulator and decoder 702 to obtain the second sub- message SM2, while treating the first communication signal CS1 as noise.
  • a interference cancelling function 704 cancels the interfering second sub-message SM2 from the superposed communication signal SCS.
  • the interference cancelled superposed communication signal SCS is demodulated and decoded by a demodulator and decoder 706.
  • a de-interleaver and splitting function 708 derives the first sub-message SM1 and the first message M1 from the interference cancelled superposed communication signal SCS.
  • the receiver block scheme 700 derives the first message M1 addressed for the first client device 300a, as well as the first sub-message SM1 addressed for the second client device 300b.
  • the first sub- message SM1 is prepared to be forwarded to the second client device 300b.
  • the first sub-message SM1 is encoded and modulated by an encoder and modulator 710 to generate a third communication signal CS3 comprising the first sub-message SM1.
  • the third communication signal CS3 is mapped to REs by a SL RE mapper (not shown in Fig. 7) and transmitted to the second client device 300b.
  • Fig. 8 shows a receiver block scheme 800 for a second client device 300b corresponding to the transmitter block scheme 600 shown in Fig. 6, i.e. the receiver block scheme 800 is configured to enable reception, decoding, and demodulation of the superposed communication signal SCS generated by the transmitter block scheme 600.
  • the receiver of the second client device 300b receives the superposed communication signal SCS from the network node 100 and the third communication signal CS3 from the first client device 300a.
  • the superposed communication signal SCS is demodulated and decoded by a demodulator and decoder 802 to obtain the second sub-message SM2.
  • the third communication signal CS3 is demodulated and decoded by a demodulator and decoder 804 to obtain the first sub- message SM1 .
  • a concatenation function 806 concatenates the first sub-message SM1 and the second sub-message SM2 to obtain the second message M2.
  • Fig. 9 shows a transmitter block scheme 900 according to an implementation based on independent encoding and modulation before concatenation. In the transmitter block scheme 900 shown in Fig.
  • a splitting function 902 splits the second message M2 into a first sub-message SM1 and a second sub-message SM2.
  • An encoder and modulator 904 encodes and modulates the first message M1 to obtain a modulated first message M1
  • an encoder and modulator 906 encodes and modulates the first sub-message SM1 to obtain a modulated first sub-message SM1 .
  • the modulated first message M1 and the modulated first sub-message SM1 are input into a concatenation function 908.
  • the concatenation function 908 concatenates the modulated first message M1 and the modulated first sub-message SM1 to obtain a first communication signal CS1.
  • the second sub-message SM2 is passed through an encoder 910 and a modulator 912 which encodes and modulates, respectively, the second sub-message SM2 to obtain a second communication signal CS2.
  • the transmitter block scheme 900 shown in Fig. 9 scales the first communication signal CS1 and second communication signal CS2 using a power ratio 1 - a of the total transmission power P for the first communication signal CS1 at a first multiplier 916 and a power ratio a of the total transmission power P for the second communication signal CS2 at a second multiplier 918.
  • the scaled first communication signal CS1 and the scaled second communication signal CS2 are then combined by a combining function 920 into a superposed communication signal SCS.
  • the superposed communication signal SCS is mapped to REs by a downlink RE mapper (not shown in Fig. 9) and concurrently transmitted to the first client device 300a and the second client device 300b.
  • the transmitter block scheme 600 shown in Fig. 6, as well as the transmitter block scheme 900 shown in Fig. 9, uses linear superposition of modulated signals with symbol conversion in a symbol conversion function 614; 914.
  • other types of superposition techniques such as plain linear superposition (without symbol conversion), e.g. NOMA (a.k.a. power- domain superposition), or joint mapping of codeword bits to constellation symbols (a.k.a. Rate- adaptive constellation Expansion Multiple Access (REMA) may also be used.
  • NOMA a.k.a. power- domain superposition
  • RMA Rate- adaptive constellation Expansion Multiple Access
  • Fig. 10 shows a receiver block scheme 1000 for a first client device 300a corresponding to the transmitter block scheme 900 shown in Fig. 9, i.e. the receiver block scheme 1000 is configured to enable reception, encoding, and demodulation of the superposed communication signal SCS generated by the transmitter block scheme 900.
  • the receiver of the first client device 300a process according to the block scheme shown in Fig. 10.
  • the second communication signal CS2 is demodulated and decoded by a demodulator and decoder 1002 to obtain the second sub-message SM2, while treating the first communication signal CS1 as noise.
  • a interference cancelling function 1004 cancels the interfering second sub-message SM2 from the superposed communication signal SCS.
  • a de-interleave and split function 1006 derives the first sub-message SM1 and the first message M1 from the interference cancelled superposed communication signal SCS.
  • Parallel demodulation and decoding of the first sub-message SM1 and the first message M1 is performed, by a demodulator and decoder 1008 and a demodulator and decoder 1010, respectively.
  • the first sub-message SM1 is encoded and modulated by an encoder and modulator 1012 to generate a third communication signal CS3 comprising the first sub-message SM1.
  • the third communication signal CS3 is mapped to REs by a SL RE mapper (not shown in Fig. 10) and transmitted to the second client device 300b.
  • the same receiver block scheme may be used, independent on whether the superposed communication signal SCS was generated by the transmitter scheme 600 shown in Fig. 6 or by the transmitter block scheme 900 shown in Fig. 9.
  • the receiver block scheme 800 shown in Fig. 8 may be used for the second client device 300b also when the superposed communication signal SCS was generated by the transmitter block scheme 900.
  • the superposed communication signal SCS resulting from either the transmitter block scheme 600 shown in Fig. 6 or the transmitter block scheme 900 shown in Fig. 9, is mapped to REs and scheduled to be transmitted to the first client device 300a and the second client device 300b.
  • the network node 100 also schedules the transmission of a third communication signal CS3 comprising the first sub-message SM1 from the first client device 300a to the second client device 300b.
  • the network node 100 may schedule the transmissions of the superposed communication signal SCS and the third communication signal CS3 using control information signalling.
  • step I in Fig. 1 1 the network node 100 generates a first control signal C1 and a second control signal C2.
  • the first control signal C1 comprises a first control information associated with the transmission of the superposed communication signal SCS to the first client device 300a.
  • the second control signal C2 comprises a second control information associated with the transmission of the superposed communication signal SCS to the second client device 300b.
  • the first control information may indicate at least one of: downlink scheduling information for the first client device 300a, a presence of the first sub-message SM1 in the first communication signal CS1 , a size of the first sub-message SM1 in the first communication signal CS1 , and a power ratio for the first communication signal CS1 in the superposed communication signal SCS.
  • Downlink scheduling information indicates the presence of a message for the first client device 300a which the control information is addressed to, including the time-frequency resources used for transmission.
  • Presence of the first sub-message SM1 makes the receiver of the first client device 300a aware that the received signal contains a first sub-message which is not intended for the first client device 300a, therefore the receiver has to be prepared to demodulate, decode and split the first sub-message from its own message, then encode it and relay it to another client device.
  • the size of the first sub-message SM1 allows demodulation and decoding of the first sub-message SM1.
  • the power ratio simplifies interference cancellation and detection/demodulation of the first message M1 and first sub-message SM1 in the superposed communication signal SCS.
  • the second control information may indicate at least one of: downlink scheduling information for the second client device 300b, a presence of the first sub-message SM1 in the first communication signal CS1 , and a size of the first sub-message SM1 in the first communication signal CS1.
  • Downlink scheduling information indicates the presence of a message for the second client device 300b which the control information is addressed to, including the time- frequency resources used for transmission. Presence of the first sub-message SM1 in the first communication signal makes the receiver of the second client device 300b aware that the second sub-message SM2 does not contain the whole second message M2 for the second client device 300b.
  • the fourth control signal C4 comprises a fourth control information associated with a reception of the first sub-message SM1 from the first client device 300a.
  • the fourth control signal C4 is intended to provide the second client device 300b with necessary information, e.g. time-frequency resources, modulation and coding formats, needed to receive the first sub-message SM1 from the first client device 300a.
  • step V the network node 100 transmits the third control signal C3 to the first client device 300a and transmits the fourth control signal C4 to the second client device 300b.
  • the first client device 300a receive the third control signal C3 from the network node 100, and may from the third control signal C3 derive/extract the third control information associated with the transmission of the first sub-message SM1 to the second client device 300b. Based on the derived third control information the first client device 300a transmits the third communication signal CS3 to the second client device 300b, as shown in step VI.
  • the first sub-message SM1 ' is addressed for the first client device 300a via the second client device 300b.
  • the first client device 300a derives the second sub-message SM2 ' from the second superposed communication signal SCS2.
  • the first client device 300a receives a third communication signal CS3 ' from the second client device 300b, where the third communication signal CS3 ' comprises the first sub-message SM1 ' .
  • the first client device 300a derives the first sub-message SM1 ' .
  • the first client device 300a concatenates the first sub-message SM1 ' and the second sub- message SM2 ' so as to obtain a second message M2 ' .
  • region comprised between the x-axis, y-axis and the dashed curve shows the achievable data rate pairs for UEi and UE2 when plain power-domain superposition is employed and the region comprised between the x-axis, y-axis and the dotted line shows the achievable data rate pairs for UEi and UE2 with orthogonal multiplexing.
  • region II in Fig. 12 indicates the improvement in data rates for UEi and UE2 achievable with the transmission scheme of the disclosed invention compared to the conventional transmission schemes. It is clear from Fig. 12 that the disclosed transmission scheme is able to provide significantly higher data rates than the conventional transmission schemes.
  • Fig. 12 furthermore shows a region comprised between the x-axis, y-axis and the straight solid line.
  • This region illustrates the data rate pairs that would be achievable if the channel from UEi to UE2 had infinite capacity.
  • this region is shown as the ultimate performance limit that any real system could try to approach without being able to achieve, as such an ideal channel does not exist.
  • the client device 300a, 300b herein may be denoted as a user device, a User Equipment (UE), a mobile station, an internet of things (loT) device, a sensor device, a wireless terminal and/or a mobile terminal, is enabled to communicate wirelessly in a wireless communication system, sometimes also referred to as a cellular radio system.
  • UE User Equipment
  • LoT internet of things

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Abstract

L'invention concerne un nœud de réseau (100) pour un système de communication sans fil (500) configuré pour obtenir un premier message (M1) adressé à un premier dispositif client (300a) et un second message (M2) adressé à un second dispositif client (300b). Le nœud de réseau (100) divise en outre le second message (M2) en un premier sous-message (SM1) et un second sous-message (SM2), le premier sous-message (SM1) étant adressé au deuxième dispositif client (300b) par l'intermédiaire du premier dispositif client (300a). En outre, le nœud de réseau (100) génère un premier signal de communication (CS1) comprenant le premier message (M1) et le premier sous-message (SM1) et un second signal de communication (CS2) comprenant le second sous-message (SM2). Le nœud de réseau (100) combine en outre le premier signal de communication (CS1) et le second signal de communication (CS2) en un signal de communication superposé (SCS) et transmet le signal de communication superposé (SCS) simultanément au premier dispositif client (300a) et au second dispositif client (300b). En outre, l'invention concerne également des procédés correspondants d'un premier dispositif client (300a) et d'un second dispositif client (300b), et un programme informatique.
PCT/EP2017/072255 2017-09-05 2017-09-05 Nœud de réseau, premier dispositif client, second dispositif client et procédés associés WO2019048027A1 (fr)

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