WO2023239276A1 - Procédé d'obtention d'une capacité et de précodage d'un paquet de données pour un agencement d'émetteur et de récepteur à antennes multiples, produit programme d'ordinateur, support de stockage lisible par ordinateur non transitoire, dispositif sans fil et nœud émetteur-récepteur - Google Patents

Procédé d'obtention d'une capacité et de précodage d'un paquet de données pour un agencement d'émetteur et de récepteur à antennes multiples, produit programme d'ordinateur, support de stockage lisible par ordinateur non transitoire, dispositif sans fil et nœud émetteur-récepteur Download PDF

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Publication number
WO2023239276A1
WO2023239276A1 PCT/SE2023/050527 SE2023050527W WO2023239276A1 WO 2023239276 A1 WO2023239276 A1 WO 2023239276A1 SE 2023050527 W SE2023050527 W SE 2023050527W WO 2023239276 A1 WO2023239276 A1 WO 2023239276A1
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WO
WIPO (PCT)
Prior art keywords
remote
capability
tnode
receiver arrangement
coding
Prior art date
Application number
PCT/SE2023/050527
Other languages
English (en)
Inventor
Joakim Axmon
Bengt Lindoff
Original Assignee
Beammwave Ab
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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Publication date
Application filed by Beammwave Ab filed Critical Beammwave Ab
Publication of WO2023239276A1 publication Critical patent/WO2023239276A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0628—Diversity capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming

Definitions

  • the present disclosure relates to a method of obtaining a capability and pre-coding a data packet for a multi-antenna transmitter and receiver arrangement, a computer program product, a non-transitory computer-readable storage medium, a wireless device, and a transceiver node.
  • the disclosure relates to a method of obtaining a capability and precoding a data packet for a multi-antenna transmitter and receiver arrangement, a computer program product, a non-transitory computer-readable storage medium, a wireless device, and a transceiver node as defined in the introductory parts of the independent claims.
  • MIMO multiple-input multiple-output
  • BF beamforming
  • Analog BF in which the radio signals from/to antennas are combined in the analog domain.
  • This architecture may have problems, such as slow beam tracking, and that there is no channel knowledge per antenna, as only the combined channel is known.
  • An example of analog BF can be found in US 2021/050893 Al.
  • Hybrid BF in which radio signals of a subset of antennas is combined in the analog domain to combined streams and the combined streams are analog-to-digital (AD) converted and further combined in the digital domain for reception and in which signals are processed in the digital domain before digital-to-analog (DA) converted and thereafter further processed in the analog domain for transmission.
  • AD analog-to-digital
  • DA digital-to-analog
  • Digital BF in which all streams are AD converted and combined in the digital domain for reception and in which signals are processed in the digital domain before DA conversion (and no beamforming processing is performed in the analog domain) for transmission.
  • digital BF there is full channel knowledge for each/all antenna(s).
  • processing may be very complex and/or power consuming, e.g., if the number of antennas is large.
  • An example of digital BF can be found in US 9054845 B2.
  • digital BF in theory is capable of handling an infinite number of directions, while analog BF can only handle a single direction and hybrid BF typically can handle the same number of directions as the number of transceivers, digital BF is able to handle more complex radio channels, such as non-Line-of-Sight, than analog BF and hybrid BF.
  • the performance may differ between analog, hybrid, and digital BF, and in order to achieve higher or optimal capacity there may be a need for a method and an apparatus in transceiver nodes informing each other about the performance or capability of the respective transceiver nodes, e.g., as different transceiver nodes may have different capabilities, and thereafter perform pre-coding accordingly.
  • US 9478857 B2 discloses that a terminal transmits information regarding a beamforming capability to a base station. Furthermore, US 2013/0045690 Al discloses an apparatus and a method for supporting diversity in a beamformed wireless communication system. However, there may be a need for improved or alternative methods of informing other transceiver nodes about the performance or capability of pre-coding data packets.
  • An object of the present disclosure is to mitigate, alleviate or eliminate one or more of the above-identified deficiencies and disadvantages in the prior art and solve at least the above-mentioned problem.
  • a method for a multi-antenna transmitter and receiver arrangement comprising: obtaining a capability of a remote multi-antenna transmitter and receiver arrangement comprised in a remote TNode, wherein the obtained capability is indicative of a first or second spatio-temporal dispersion the remote multi-antenna transmitter and receiver arrangement is able to manage, the first spatio-temporal dispersion being smaller than the second spatiotemporal dispersion; and pre-coding one or more data packet(s) to be transmitted to the remote TNode based on the obtained capability.
  • the method further comprises receiving/obtaining reception statistics associated with the first and/or second pre-coding mode(s).
  • obtaining a capability of the remote multi-antenna transmitter and receiver arrangement comprises deriving he capability of the remote multiantenna transmitter and receiver arrangement from the received reception statistics.
  • the reception statistics is associated with one or more of a first pre-coding mode and a second pre-coding mode.
  • the reception statistics is received from the remote TNode, and comprise one or more signal quality reports.
  • the one or more signal quality reports comprises one or more of channel state information, CSI, signal to noise ratio, SNR, reference signal received power, RSRP, reference signal received quality, RSRQ, Power delay Profile, PDP, and NAK/ACK statistics.
  • the reception statistics is obtained, at the WD, from a signal received from the remote TNode, and wherein the reception statistics comprises one or more of channel state information, CSI, signal to noise ratio, SNR, reference signal received power, RSRP, reference signal received quality, RSRQ, Power delay Profile, PDP, and NAK/ACK statistics.
  • the reception statistics comprises one or more of channel state information, CSI, signal to noise ratio, SNR, reference signal received power, RSRP, reference signal received quality, RSRQ, Power delay Profile, PDP, and NAK/ACK statistics.
  • the method further comprises obtaining channel characteristics for a plurality of radio channels between the remote TNode and the multiantenna transmitter and receiver arrangement.
  • the pre-coding is further based on the obtained channel characteristics.
  • the method further comprises: determining if the obtained capability is a first capability or a second capability, different from the first capability, the second capability indicative of the remote TNode being able to manage the second spatiotemporal dispersion and the first capability indicative of the remote TNode being able to manage only the first spatio-temporal dispersion; performing pre-coding in a first pre-coding mode if the obtained capability is determined to be the first capability; and performing pre-coding in a second pre-coding mode, different from the first pre-coding mode, if the obtained capability is determined to be the second capability.
  • the method further comprises deriving a channel tap filter length from the obtained channel characteristics.
  • performing pre-coding in the first pre-coding mode comprises allocating a first transmit power associated with a first number of channel taps.
  • performing pre-coding in the second pre-coding mode comprises allocating a second transmit power associated with a second number, larger than the first number, of channel taps.
  • the first and second numbers of channel taps are less than or equal to the channel tap filter length.
  • the method further comprises deriving a time delay from the obtained channel characteristics.
  • performing pre-coding in the first pre-coding mode comprises utilizing a first set of phase shifts and time delays for the one or more data packet(s) to be transmitted
  • performing pre-coding in the second pre-coding mode comprises utilizing a second set, different from the first set, of phase shifts and time delays for the one or more data packet(s) to be transmitted
  • the first and second sets of phase shifts and time delays are determined based on the channel tap filter length and/or the time delay derived from the obtained channel characteristics.
  • the capability of the remote multi-antenna transmitter and receiver arrangement is indicative of the second spatio-temporal/spatial dispersion if the remote TNode is able to manage digital beamforming or is able to manage hybrid beamforming with a first number of transceivers
  • the capability of the remote multi-antenna transmitter and receiver arrangement is indicative of the first spatio- temporal/spatial dispersion if the remote TNode is able to manage analog beamforming or is able to manage hybrid beamforming with a second number of transceivers, the second number being smaller than the first number, but not able (i.e., unable) to manage digital beamforming or hybrid beamforming with the first number of transceivers.
  • obtaining a capability of the remote multi-antenna transmitter and receiver arrangement comprises directly receiving from the remote TNode the capability of the remote multi-antenna transmitter and receiver arrangement.
  • a computer program product comprising instructions, which, when executed on at least one processor of a processing device, cause the processing device to carry out the method according to the first aspect or any of the embodiments mentioned herein.
  • a non-transitory computer-readable storage medium storing one or more programs configured to be executed by one or more processors of a processing device, the one or more programs comprising instructions which, when executed by the processing device, causes the processing device to carry out the method according to the first aspect or any of the embodiments mentioned herein.
  • a transceiver node comprising a multi-antenna transmitter and receiver arrangement and controlling circuitry configured to cause: obtainment of a capability of a remote multi-antenna transmitter and receiver arrangement comprised in a remote TNode, the obtained capability indicative of a first or second spatio-temporal dispersion the remote multi-antenna transmitter and receiver arrangement is able to manage, the first spatio-temporal dispersion being smaller than the second spatio-temporal dispersion; and pre-coding of one or more data packet(s) to be transmitted to the remote TNode based on the obtained capability.
  • An advantage of some embodiments is that the capacity of a wireless communication system is improved/increased (e.g., optimized).
  • Another advantage of some embodiments is a reduced power consumption for reception and/or transmission of data between transceiver nodes.
  • Yet another advantage of some embodiments is that robustness (of the communication) is improved/increased.
  • a further advantage of some embodiments is that performance is improved or optimized.
  • Yet a further advantage of some embodiments is that complexity (of the implementation) is reduced (or minimized).
  • Figure 1A is a schematic drawing illustrating method steps according to some embodiments
  • Figure IB is a schematic drawing illustrating a multi-antenna transmitter and receiver arrangement according to some embodiments
  • Figure 3 is a flowchart illustrating method steps implemented in a multi-antenna transmitter and receiver arrangement, or in a control unit/control circuitry thereof, according to some embodiments;
  • Figure 4 is a schematic drawing illustrating a conversion unit according to some embodiments.
  • Figure 6 is a schematic drawing illustrating a receiver arrangement connected to transceivers and antennas according to some embodiments.
  • a wireless device is any device capable of transmitting or receiving signals wirelessly.
  • Some examples of wireless devices are user equipment (UE), mobile phones, cell phones, smart phones, Internet of Things (loT) devices, vehicle-to-everything (V2X) devices, vehicle-to-infrastructure (V2I) devices, vehicle-to-network (V2N) devices, vehicle-to-vehicle (V2V) devices, vehicle-to-pedestrian (V2P) devices, vehicle- to-device (V2D) devices, vehicle-to-grid (V2G) devices, fixed wireless access (FWA) points, tablets, laptops, wireless stations, relays, repeater devices, reconfigurable intelligent surfaces, and large intelligent surfaces.
  • UE user equipment
  • V2X vehicle-to-everything
  • V2I vehicle-to-infrastructure
  • V2N vehicle-to-network
  • V2V vehicle-to-vehicle
  • V2P vehicle-to-pedestrian
  • V2D
  • a TNode may be a remote radio unit (RRU), a repeater, a remote wireless node, or a base station (BS), such as a radio base station (RBS), a Node B, an Evolved Node B (eNB) or a gNodeB (gNB).
  • RRU remote radio unit
  • BS base station
  • eNB Evolved Node B
  • gNB gNodeB
  • a TNode may be a BS for a neighboring cell, a BS for a handover (HO) candidate cell, a remote radio unit (RRU), a distributed unit (DU), another WD (a remote WD) or a base station (BS) for a (active/deactivated) secondary cell (SCell) or for a serving/primary cell (PCell, e.g., associated with an active TCI state), a laptop, a wireless station, a relay, a repeater device, a reconfigurable intelligent surface, or a large intelligent surface.
  • RRU remote radio unit
  • DU distributed unit
  • SCell serving/primary cell
  • PCell serving/primary cell
  • the processing unit may be a digital processor.
  • the processor may be a microprocessor, a microcontroller, a central processing unit, a co-processor, a graphics processing unit, a digital signal processor, an image signal processor, a quantum processing unit, or an analog signal processor.
  • the processing unit may comprise one or more processors and optionally other units, such as a control unit.
  • a digital interface below is referred to a digital interface.
  • a digital interface is a unit converting analog signals from e.g., transceivers to digital signals, which digital signals are conveyed to e.g., a baseband processor, and/or converting digital signals from e.g., a baseband processor to analog signals, which analog signals are conveyed to e.g., one or more transceivers.
  • a digital interface possible also comprises filters and other pre-processing functions/units.
  • An antenna unit may be one single antenna. However, an antenna unit may also be a dual antenna, such as a dual patch antenna with a first (e.g., horizontal) and a second (e.g., vertical) polarization, thus functioning as two separate antennas or an antenna unit having two ports.
  • a first e.g., horizontal
  • a second e.g., vertical
  • a chip is an integrated circuit (chip) or a monolithic integrated circuit (chip) and may also be referred to as an IC, or a microchip.
  • a filter is a device or process that removes some features, components, or frequencies from a signal.
  • Spatio-temporal dispersion comprises spatial dispersion and/or temporal dispersion.
  • Spatial dispersion (dispersion in space) may be defined as the number of spatial directions in which the transceiver can simultaneously transmit and/or receive.
  • spatial dispersion represents scattering or spreading effects (originating from reflections of the transmitted radio wave from a surface of objects).
  • Temporal dispersion i.e., dispersion in time, represents memory effects in systems.
  • analog beamforming means that the beamforming processing, e.g., multiplication of a coefficient, is performed before digital to analog conversion (DAC) for transmission (and after analog to digital conversion, ADC, for reception), i.e., in the digital domain.
  • Analog beamforming means that the beamforming processing, e.g., phase shifting, is performed after DAC for transmission (and before ADC for reception), i.e., in the analog domain.
  • Hybrid beamforming means that some beamforming processing, e.g., phase shifting, is performed after DAC and some beamforming processing, e.g., multiplication of a coefficient, is performed before DAC for transmission (and before and after ADC for reception), i.e., processing in both digital and analog domains.
  • some beamforming processing e.g., phase shifting
  • some beamforming processing e.g., multiplication of a coefficient
  • PDP power delay profile
  • the PDP gives the intensity of a signal received through a multipath channel as a function of time delay.
  • the time delay is the difference in travel time between multipath arrivals.
  • a basic concept of the invention is to perform capability signalling for a multi-antenna transmitter and receiver arrangement, such as a multi-antenna transceiver arrangement, comprised in a WD or a TNode.
  • the multi-antenna transmitter and receiver arrangement capability comprises capability to handle spatial-temporal dispersion of the radio channel utilized for communication with a remote TNode.
  • the selection of pre-coding (or beamforming) method/procedure is based on an obtained capability of a multi-antenna transmitter and receiver arrangement for a remote Tnode, wherein the capability can be obtained by reception of a capability report or by determination by probing of performance of the transmission of data packets.
  • figure 1A illustrates method steps according to some embodiments
  • figure IB illustrates a multi-antenna transmitter and receiver arrangement according to some embodiments.
  • the method 100 is for a multiantenna transmitter and receiver arrangement 400.
  • the multi-antenna transmitter and receiver arrangement 400 is comprisable or comprised in a wireless device (WD) or in a transceiver node (TNode), i.e., in some embodiments a WD or a TNode comprises the multi-antenna transmitter and receiver arrangement 400.
  • the method 100 comprises obtaining 110 a capability of a remote multi-antenna transmitter and receiver arrangement comprised in a remote TNode.
  • the obtained capability is indicative of a first (spatio-temporal dispersion) or a second spatio-temporal dispersion (of radio channels) (that) the remote multiantenna transmitter and receiver arrangement (or the WD/TNode comprising it) is able to manage. Furthermore, the first spatio-temporal dispersion is smaller than the second spatiotemporal dispersion.
  • obtaining 110 a capability of the remote multiantenna transmitter and receiver arrangement comprises directly receiving 106, from the remote TNode, the capability of the remote multi-antenna transmitter and receiver arrangement.
  • the method 100 comprises receiving or obtaining 108 reception statistics. Furthermore, in some embodiments, the reception statistics is received from the remote TNode.
  • the reception statistics is obtained, at the WD, from a signal received from the remote TNode.
  • the obtained/received reception statistics is or may be associated with the first and/or second pre-coding mode(s).
  • obtaining 110 a capability of the remote multi-antenna transmitter and receiver arrangement comprises deriving (or obtaining/calculating) 111 the capability of the remote multi-antenna transmitter and receiver arrangement from the received/obtained reception statistics.
  • Some examples of reception statistics are signal quality reports.
  • the reception statistics and/or the signal quality reports comprise channel state information (CSI), signal to noise ratio (SNR), reference signal received power (RSRP), reference signal received quality (RSRQ), Power delay Profile and/or NAK/ACK statistics (ACK/NAK statistics).
  • CSI channel state information
  • SNR signal to noise ratio
  • RSRP reference signal received power
  • RSS reference signal received quality
  • ACK/NAK statistics NAK/ACK statistics
  • the method 100 comprises pre-coding 120 one or more data packet(s) to be transmitted to the remote TNode based on the obtained capability. In some embodiments, the method 100 comprises transmitting 130 the one or more pre-coded data packet(s) to the remote TNode. Furthermore, in some embodiments, the method 100 comprises obtaining 112 channel characteristics for a plurality of radio channels between the remote TNode and the multi-antenna transmitter and receiver arrangement 400 (when comprised in the WD/TNode). In these embodiments, pre-coding 120 is (further) based on the obtained channel characteristics. Furthermore, in some embodiments, the method 100 comprises determining 116 if the obtained capability is a first capability or a second capability, the second capability being different from the first capability.
  • the second capability is indicative of the remote TNode being able to manage the second spatio-temporal dispersion and the first capability is indicative of the remote TNode being able to manage only the first spatio-temporal dispersion, i.e., indicative of the remote TNode being able to manage the first spatio-temporal dispersion but not able (i.e., unable) to manage the second spatio-temporal dispersion.
  • the method 100 comprises performing 122 pre-coding (120) in a first precoding mode if the obtained capability is determined to be the first capability, and performing 124 pre-coding (120) in a second pre-coding mode if the obtained capability is determined to be the second capability.
  • the second pre-coding mode is different from the first pre-coding mode.
  • the method 100 comprises deriving (or obtaining or calculating) 114 a channel tap filter length from the obtained channel characteristics.
  • performing 122 pre-coding in the first pre-coding mode comprises allocating 123 a first transmit power associated with a first number of channel taps and/or performing
  • 124 pre-coding in the second pre-coding mode comprises allocating 125 a second transmit power associated with a second number of channel taps.
  • the second number of channel taps is larger than the first number of channel taps.
  • the second transmit power is larger than the first transmit power.
  • the first and second (total) transmit power is the same (even though the second number is larger than the first number of channel taps).
  • the transmit power per channel tap is larger in the first pre-coding mode than in the second precoding mode (e.g., if the first and second transmit power is the same and the second number of channel taps is larger than the first number of channel taps).
  • each of the first and second numbers of channel taps are less than or equal to the channel tap filter length, i.e., the first number of channel taps is less than or equal to the channel tap filter length and the second number of channel taps is less than or equal to the channel tap filter length.
  • the first number is 1, the second number is 2 and the channel tap filter length is 2.
  • Channel taps etc. may be derived regardless of whether the characteristics are determined in frequency or time domain by utilizing well-known relationships between frequency (f) and time (t).
  • the method 100 comprises deriving (or obtaining or calculating) 115 a time delay, e.g., of one or more radio channels, from the obtained channel characteristics, e.g., in addition to deriving 114 the channel tap filter length from the obtained channel characteristics.
  • performing 122 pre-coding (120) in the first pre-coding mode comprises utilizing 126 a first set of phase shifts, time delays and optionally scaling factors for the one or more data packet(s) to be transmitted
  • performing 124 pre-coding (120) in the second pre-coding mode comprises utilizing 128 a second set of phase shifts, time delays and optionally scaling factors for the one or more data packet(s) to be transmitted.
  • Each of the first and second sets of phase shifts, time delays and optionally scaling factors comprises one or more phase shifts, one or more scaling factors and/or one or more time delays.
  • the second set of phase shifts, time delays and optionally scaling factors is different from the first set of phase shifts, time delays and optionally scaling factors.
  • the first and second sets of phase shifts, time delays and optionally scaling factors are determined based on the channel tap filter length and/or the derived time delay and optionally a coefficient derived from the obtained channel characteristics.
  • the phase shifts of the first and second sets are determined based on the channel tap filter length, the scaling factors of the first and second sets are determined based on the derived coefficient, and the time delays of the first and second sets are determined based on the derived time delay.
  • the phase shifts, time delays and optionally scaling factors of the second set are different from the ones in the first set only for line-of-sight channels.
  • the phase shifts, time delays and optionally scaling factors of the second set are different from the ones in the first set also for non-line-of-sight channels.
  • the relative phase between two different antennas is dependent on the distance between the two different antennas.
  • the first pre-coding mode gives/has/provides, or is associated with, a first beamwidth
  • the second pre-coding mode gives/has/provides, or is associated with, a second beamwidth.
  • the data packet to be transmitted is pre-coded to be transmitted with a first beamwidth
  • the second precoding mode the data packet to be transmitted is pre-coded to be transmitted with a second beamwidth.
  • the first beamwidth is different from the second beamwidth.
  • the first beamwidth is broader than the second beamwidth.
  • the first beamwidth may include many, several (such as more than 3 spatial directions) or all spatial directions (i.e., be omnidirectional; i.e., the beam is formed widely to comprise many or all spatial directions) and the second beamwidth may be a single spatial direction (i.e., the beam is formed narrowly to comprise only one or a few directions, such as 2 or 3 spatial directions).
  • This may be beneficial, e.g., if/when the radio channel(s) comprises multi-path Non-Line-of- Sight (NLOS) signals from different directions.
  • NLOS Non-Line-of- Sight
  • the capability of the remote multi-antenna transmitter and receiver arrangement is indicative of the second spatio- temporal/spatial dispersion if the remote TNode/multi-antenna transmitter and receiver arrangement is able to manage digital beamforming. In some embodiments, the capability of the remote multi-antenna transmitter and receiver arrangement is indicative of the second spatio-temporal/spatial dispersion if the remote TNode/multi-antenna transmitter and receiver arrangement is able to manage hybrid beamforming with a first number of transceivers.
  • the capability of the remote multi-antenna transmitter and receiver arrangement is indicative of the first spatio-temporal/spatial dispersion if the remote TNode/multi-antenna transmitter and receiver arrangement is able to manage analog beamforming (but unable/not able to manage digital beamforming or hybrid beamforming with the first number of transceivers). In some embodiments, the capability of the remote multi-antenna transmitter and receiver arrangement is indicative of the first spatio- temporal/spatial dispersion if the remote TNode/multi-antenna transmitter and receiver arrangement is able to manage hybrid beamforming with a second number of transceivers (but unable/not able to manage digital beamforming or hybrid beamforming with the first number of transceivers).
  • the second number of transceivers is smaller than the first number of transceivers.
  • the first number is 3 and the second number is 2.
  • the first number is 2 and the second number is 1.
  • the second number is 1 and the first number is 3.
  • the pre-coding 120 is performed in one or more of a complex frequency domain, a wavelet domain, a frequency domain, a spatial domain, and a time domain.
  • the pre-coding 120 is performed in the frequency domain only.
  • the pre-coding 120 is performed partly in the frequency domain and partly in the time domain (e.g., if the transceivers utilize orthogonal frequency-division multiplexing, OFDM).
  • the pre-coding 120 is performed in the time domain only.
  • the pre-coding 120 is performed (only) in a spatial domain and a time domain, i.e., in a spatio-temporal domain.
  • the multi-antenna transmitter and receiver arrangement 400 comprises a transmitter arrangement 404.
  • the transmitter arrangement 404 comprises a pre-coder 2018.
  • the pre-coder 2018 pre-codes or is configured to pre-code data packets in a complex frequency domain, a wavelet domain, or a frequency domain.
  • the transmitter arrangement 404 comprises a first beamforming processing unit 1940.
  • the first beamforming processing unit 1940 converts or is configured to convert the pre-coded data packets from a complex frequency domain, a wavelet domain, or a frequency domain to a time domain.
  • the transmitter arrangement 404 comprises a second beamforming processing unit 1810.
  • the second beamforming processing unit 1810 is configured to process the pre-coded data packets in one or more of a spatial domain and a time domain to obtain digital signals.
  • the second beamforming processing unit 1810 comprises a plurality (m) of filters, such as spatio-temporal filters 1800, ..., 1807.
  • the filters e.g., the spatio-temporal filters 1800, ..., 1807, processes or are configured to process the pre-coded data packets in one or more of a spatial domain and a time domain to obtain digital signals.
  • the pre-coder 2018 comprises the first beamforming processing unit 1940. Furthermore, in some embodiments, the pre-coder 2018 comprises the second beamforming processing unit 1810.
  • the pre-coder 2018 comprises the first and second beamforming processing units 1940, 1810.
  • the first and/or second beamforming processing is part of the pre-coding/pre-coder 2018.
  • the transmitter arrangement 404 comprises a filter control unit 1920.
  • the filter control unit 1920 determines or is configured to determine coefficients, such as filter coefficients of the plurality (m) of spatio-temporal filters 1800, ..., 1807 or beamforming weights, for the first and/or the second beamforming processing units 1940, 1810.
  • the transmitter arrangement 404 comprises a plurality (N) of combiners 1840, ..., 1847.
  • the combiners 1840, ..., 1847 combines or are configured to combine the plurality (N) of digital signals to obtain a plurality (N) of combined digital signals.
  • the transmitter arrangement 404 comprises a plurality (I) of conversion units 620, ..., 635.
  • the conversion units 620, ..., 635 convert or are configured to convert each of the plurality (N) of combined digital signals to respective analog signals.
  • there are two conversion units for each analog signal e.g., one for an in-phase (I) branch and one for a quadrature phase (Q) branch.
  • there are four conversion units for each analog signal e.g., if dual polarized antenna units are utilized and each (transceiver) chip comprises 2 transceivers.
  • the multi-antenna transmitter and receiver arrangement 400 comprises a receiver arrangement 402 (shown in figure 6 and described below in connection with figure 6).
  • the multi-antenna transmitter and receiver arrangement 400 comprises a plurality of transceivers 500, 501, ..., 515.
  • the transceivers 500, 501, ..., 515 transmits or are configured to transmit each of the analog signals via a plurality of (respective) antenna units 700, 701, ..., 715 (e.g., during a transmission mode).
  • the transceivers 500, 501, ..., 515 receives or are configured to receive a plurality of analog radio signals via the plurality of (respective) antenna units 700, 701, ..., 715 (e.g., during a reception mode).
  • the multi-antenna transmitter and receiver arrangement 400 comprises a chip 412 (shown in figure IB).
  • the chip 412 comprises the pre-coder 2018, the first beamforming processing unit 1940, the second beamforming processing unit 1810, the filter control unit 1920 and the combiners 1840, ..., 1847.
  • the chip is clocked with a clock (or an oscillator) having a chip frequency/rate.
  • the multi-antenna transmitter and receiver arrangement (400) comprises a first chip.
  • the first chip comprises the pre-coder 2018, the first beamforming processing unit 1940 and the filter control unit 1920.
  • the multiantenna transmitter and receiver arrangement 400 comprises a second chip.
  • the second chip comprises the second beamforming processing unit 1810, and the combiners 1840, ..., 1847.
  • the multi-antenna transmitter and receiver arrangement 400 comprises a digital interface, DI.
  • the remote multi-antenna transmitter and receiver arrangement is identical to the multi-antenna transmitter and receiver arrangement 400 (and may thus comprise the parts described above).
  • a computer program product comprising a non- transitory computer readable medium 200, such as a punch card, a compact disc (CD) ROM, a read only memory (ROM), a digital versatile disc (DVD), an embedded drive, a plug-in card, a random access memory (RAM) or a universal serial bus (USB) memory, is provided.
  • Figure 2 illustrates an example computer readable medium in the form of a compact disc (CD) ROM 200.
  • the computer readable medium has stored thereon, a computer program comprising program instructions.
  • the computer program is loadable into a data processor (PROC) 220, which may, for example, be comprised in a computer 210 or a computing device or a control unit.
  • PROC data processor
  • the computer program When loaded into the data processor, the computer program may be stored in a memory (MEM) 230 associated with or comprised in the data processor. According to some embodiments, the computer program may, when loaded into and run by the data processor, cause execution of method steps according to, for example, the method illustrated in figure 1A, which is described herein. Furthermore, in some embodiments, there is provided a computer program product comprising instructions, which, when executed on at least one processor of a processing device, cause the processing device to carry out the method illustrated in figure 1A.
  • MEM memory
  • a non-transitory computer-readable storage medium storing one or more programs configured to be executed by one or more processors of a processing device, the one or more programs comprising instructions which, when executed by the processing device, causes the processing device to carry out the method illustrated in figure 1A.
  • Figure 3 illustrates method steps implemented in a WD, TNode, or multi-antenna transmitter and receiver arrangement 400 (or in a control unit or controlling circuitry comprised therein or associated therewith, e.g., a processing unit, and configured to control the multi-antenna transmitter and receiver arrangement 400) according to some embodiments.
  • the multi-antenna transmitter and receiver arrangement 400 comprises controlling circuitry.
  • a WD or a TNode comprising the multi-antenna transmitter and receiver arrangement 400 comprises the controlling circuitry.
  • the controlling circuitry causes or is configured to cause obtainment 310 of a capability of a (remote) multi-antenna transmitter and receiver arrangement comprised in a remote TNode, wherein the obtained capability is indicative of a first spatio-temporal dispersion or a second spatio-temporal dispersion (that) the remote multi-antenna transmitter and receiver arrangement (or remote TNode) is able to manage.
  • the first spatio-temporal dispersion is smaller than the second spatio-temporal dispersion.
  • the controlling circuitry may be associated with (e.g., operatively connectable, or connected, to) a first obtainment unit (e.g., first obtaining circuitry, first obtainer or transceivers 500, 501, ..., 515 with associated antenna units 700, 701, ..., 715). Furthermore, the controlling circuitry causes or is configured to cause pre-coding 320 of one or more data packet(s) to be transmitted to the remote TNode based on the obtained capability. To this end, the controlling circuitry may be associated with (e.g., operatively connectable, or connected, to) a pre-coding unit (e.g., pre-coding circuitry or the pre-coder 2018).
  • a pre-coding unit e.g., pre-coding circuitry or the pre-coder 2018
  • the controlling circuitry causes or is configured to cause reception or obtainment 308 of reception statistics associated with the first and/or second pre-coding mode(s) from the remote TNode.
  • the controlling circuitry may be associated with (e.g., operatively connectable, or connected, to) a first reception unit (e.g., first receiving circuitry or transceivers 500, 501, ..., 515 with associated antenna units 700, 701, ..., 715).
  • the controlling circuitry may be associated with (e.g., operatively connectable, or connected, to) a sixth obtainment unit (e.g., sixth obtaining circuitry, transceivers 500, 501, ..., 515 with associated antenna units 700, 701, ..., 715 and/or a processing unit).
  • the controlling circuitry causes or is configured to cause derivation/obtainment 311 of the capability of the remote multi-antenna transmitter and receiver arrangement from the (received/obtained) reception statistics.
  • the controlling circuitry may be associated with (e.g., operatively connectable, or connected, to) a second obtainment/derivation unit (e.g., second obtaining circuitry, a second obtainer or a processing unit). Furthermore, in some embodiments, the controlling circuitry causes or is configured to cause direct reception 306, from the remote TNode, of the capability of the remote multi-antenna transmitter and receiver arrangement. To this end, the controlling circuitry may be associated with (e.g., operatively connectable, or connected, to) a second reception unit (e.g., second receiving circuitry, a second receiver or transceivers 500, 501, ..., 515 with associated antenna units 700, 701, ..., 715).
  • a second reception unit e.g., second receiving circuitry, a second receiver or transceivers 500, 501, ..., 515 with associated antenna units 700, 701, ..., 715.
  • the controlling circuitry causes or is configured to cause obtainment 312 of channel characteristics for a plurality of radio channels between the remote TNode and the multi-antenna transmitter and receiver arrangement 400.
  • the controlling circuitry may be associated with (e.g., operatively connectable, or connected, to) a third obtainment unit (e.g., third obtaining circuitry, a third obtainer and/or transceivers 500, 501, ..., 515 with associated antenna units 700, 701, ..., 715).
  • the controlling circuitry causes or is configured to cause derivation/obtainment 314 of a channel tap filter length from the obtained channel characteristics.
  • the controlling circuitry may be associated with (e.g., operatively connectable, or connected, to) a fourth obtainment unit (e.g., fourth obtaining circuitry, a fourth obtainer and/or transceivers 500, 501, ..., 515 with associated antenna units 700, 701, ..., 715). Furthermore, in some embodiments, the controlling circuitry causes or is configured to cause derivation 315 of a time delay from the obtained channel characteristics.
  • a fourth obtainment unit e.g., fourth obtaining circuitry, a fourth obtainer and/or transceivers 500, 501, ..., 515 with associated antenna units 700, 701, ..., 715.
  • the controlling circuitry causes or is configured to cause derivation 315 of a time delay from the obtained channel characteristics.
  • the controlling circuitry may be associated with (e.g., operatively connectable, or connected, to) a fifth obtainment/derivation unit (e.g., fifth obtaining/derivating circuitry, a fifth obtainer/derivator and/or transceivers 500, 501, ..., 515 with associated antenna units 700, 701, ..., 715).
  • the controlling circuitry causes or is configured to cause determination 316 of whether/if the obtained capability is a first capability or a second capability.
  • the controlling circuitry may be associated with (e.g., operatively connectable, or connected, to) a determination unit (e.g., determining circuitry, a determiner, or a processing unit).
  • the controlling circuitry causes or is configured to cause performance 322 of pre-coding (320) in a first pre-coding mode if the obtained capability is determined to be the first capability, and to cause performance 324 of pre-coding (320) in a second pre-coding mode if the obtained capability is determined to be the second capability.
  • the controlling circuitry may be associated with (e.g., operatively connectable, or connected, to) a mode actuation unit (e.g., actuating circuitry, an actuator, switch, or a processing unit).
  • the controlling circuitry causes or is configured to cause utilization 326 of a first set of phase shifts, time delays and optionally scaling factors for the one or more data packet(s) to be transmitted.
  • the controlling circuitry may be associated with (e.g., operatively connectable, or connected, to) a first utilization unit (e.g., first utilizing circuitry, a first utilizer or a processing unit). Moreover, in some embodiments, the controlling circuitry causes or is configured to cause utilization 328 of a second set of phase shifts, time delays and optionally scaling factors for the one or more data packet(s) to be transmitted. To this end, the controlling circuitry may be associated with (e.g., operatively connectable, or connected, to) a second utilization unit (e.g., second utilizing circuitry, a second utilizer or a processing unit).
  • a first utilization unit e.g., first utilizing circuitry, a first utilizer or a processing unit
  • the controlling circuitry causes or is configured to cause utilization 328 of a second set of phase shifts, time delays and optionally scaling factors for the one or more data packet(s) to be transmitted.
  • the controlling circuitry may be associated with (e.g.,
  • the controlling circuitry causes or is configured to cause (when performing 122 pre-coding in the first pre-coding mode) allocation 323 of a first transmit power associated with a first number of channel taps and the controlling circuitry causes or is configured to cause (when performing 124 pre-coding in the second pre-coding mode) allocation 325 of a second transmit power associated with a second number of channel taps.
  • the controlling circuitry may be associated with (e.g., operatively connectable, or connected, to) an allocation unit (e.g., allocating circuitry, an alligator, or a processing unit).
  • the controlling circuitry causes or is configured to cause transmission 330 of the one or more pre-coded data packet(s) to the remote TNode.
  • controlling circuitry may be associated with (e.g., operatively connectable, or connected, to) a transmission unit (e.g., transmitting circuitry, a transmitter, or transceivers 500, 501, ..., 515 with associated antenna units 700, 701, ..., 715).
  • a transmission unit e.g., transmitting circuitry, a transmitter, or transceivers 500, 501, ..., 515 with associated antenna units 700, 701, ..., 715.
  • FIG 4 illustrates a conversion unit 620 according to some embodiments.
  • the conversion unit 620 comprises a digital to analog (DA) converter 642 and an up-converter 640.
  • the DA converter 642 converts a digital signal into an analog signal and the up-converter 640 converts an analog signal, such as a baseband signal, to an analog signal with a higher frequency, such as a carrier frequency radio signal.
  • a carrier frequency radio signal such as a carrier frequency radio signal.
  • all converters 620, ..., 635 function the same way (i.e., comprises a DA converter 642 and an up-converter 640).
  • the multi-antenna transmitter and receiver arrangement 400 comprises a switch 406 configured to switch the plurality of transceivers 500, 501, ..., 515 (which are connected or connectable to antenna units 700, 701, ..., 715) between the transmitter arrangement 404 and the receiver arrangement 402.
  • the switch connects the transmitter arrangement 404 to the transceivers 500, 501, ..., 515 when the multi-antenna transmitter and receiver arrangement 400 enters a transmission mode (and/or while the multi-antenna transmitter and receiver arrangement 400 is in the transmission mode) and the switch connects the receiver arrangement 402 to the transceivers 500, 501, ..., 515 when the multi-antenna transmitter and receiver arrangement 400 enters a reception mode (and/or while the multi-antenna transmitter and receiver arrangement 400 is in the reception mode).
  • Figure 6 illustrates a receiver arrangement 402 connected or connectable to transceivers 500, 501, ..., 515 and to antenna units 700, 701, ..., 715.
  • the multi-antenna transmitter and receiver arrangement 400 comprises the receiver arrangement 402.
  • the receiver arrangement 402 comprises a plurality of analog to digital (AD) converters 600, 601, ..., 615.
  • the AD converters 600, 601, ..., 615 convert or are configured to convert the plurality of analog radio signals into a plurality of digital (baseband) signals.
  • the receiver arrangement 402 comprises down-converters (not shown), which converts an analog signal, such as a carrier frequency radio signal, to another analog signal, such as a baseband signal, with a lower frequency (before AD conversion).
  • the receiver arrangement 402 comprises an extraction unit 900.
  • the extraction unit 900 extracts or is configured to extract reference signals from each of the plurality of digital signals.
  • the extraction unit 900 comprises a plurality (N) of sub-extraction units 901, 902, ..., 916, i.e., one sub-extraction unit for each digital signal.
  • the receiver arrangement 402 comprises a channel analyzer 920.
  • the channel analyzer 920 determines or is configured to determine characteristics for each of the plurality of digital signals based on the extracted reference signals.
  • the characteristics is a (time domain) radio channel characteristics.
  • the characteristics comprises channel estimates, such as radio channel estimates, e.g., for each of the digital signals.
  • the characteristics comprises (radio) channel filter taps indicative of the radio channel characteristics.
  • the filter control unit 1920 obtains/receives determined characteristics from the channel analyzer 920 and determines the coefficients (e.g., filter coefficients or beamforming weights) for the first and/or second beamforming processing unit(s) 1940, 1810 based on the determined characteristics.
  • the coefficients e.g., the beamforming weights
  • the coefficients are determined to be the (set of) coefficients which optimizes a certain signal quality measure, such as SNR, RSRP, or RSRQ, from the received (radio channel) characteristics.
  • the signal quality measure is different for the first and second pre-coding modes.
  • the coefficients are selected based on maximum SNR (given by the obtained radio channel characteristics) in the second pre-coding mode (i.e., for transmission to a remote TNode having the second capability) whereas the coefficients are selected based on maximum SNR under the constraint/condition that only the spatio-temporal dispersion the remote multi-antenna transmitter and receiver arrangement is able to manage can be utilized in the first pre-coding mode (i.e., for transmission to a remote TNode having the first capability), thus assuming some uncertainty of the obtained (radio) channel characteristics.
  • the receiver arrangement 402 comprises a plurality of spatio-temporal filters 800, ..., 807.
  • the spatio-temporal filters 800, ..., 807 are configured to process or processes the plurality of digital signals to obtain a plurality of combined signals.
  • the receiver arrangement 402 comprises a transform unit 940.
  • the transform unit 940 is configured to transform or transforms each of the plurality of combined signals into a frequency domain.
  • the transform unit 940 has or comprises a plurality of transform sub-units. Each transform sub-unit is configured (connected and otherwise adapted) to process a respective signal of the plurality of combined signals.
  • the transform unit transforms each of the combined signals in a serial manner.
  • the multi-antenna transmitter and receiver arrangement 400 comprises a post-processing unit 960.
  • the post-processing unit 960 is configured to postprocess or post-processes the transformed signals in the frequency domain to obtain a plurality of frequency domain processed signals.
  • the plurality of analog radio signals is coded.
  • the multi-antenna transmitter and receiver arrangement 400 comprises a decoder 980.
  • the decoder 980 is configured to decode or decodes the plurality of frequency domain processed signals (in order to obtain information signals or one or more data packets).
  • any of examples 1-2 further comprising: determining (116) if the obtained capability is a first capability or a second capability, different from the first capability, the second capability indicative of the remote TNode being able to manage the second spatio-temporal dispersion and the first capability indicative of the remote TNode being able to manage only the first spatio-temporal dispersion; performing (122) pre-coding in a first pre-coding mode if the obtained capability is determined to be the first capability; and performing (124) pre-coding in a second pre-coding mode, different from the first pre-coding mode, if the obtained capability is determined to be the second capability.
  • any of examples 1-5 wherein the capability of the remote multi-antenna transmitter and receiver arrangement is indicative of the second spatial dispersion if the remote TNode is able to manage digital beamforming or is able to manage hybrid beamforming with a first number of transceivers, and wherein the capability of the remote multi-antenna transmitter and receiver arrangement is indicative of the first spatial dispersion if the remote TNode is able to manage analog beamforming or is able to manage hybrid beamforming with a second number of transceivers, the second number being smaller than the first number, but not able to manage digital beamforming or hybrid beamforming with the first number of transceivers.
  • obtaining (110) a capability of the remote multiantenna transmitter and receiver arrangement comprises directly receiving (106) from the remote TNode the capability of the remote multi-antenna transmitter and receiver arrangement.
  • Example 9 The method of any of examples 1-6, further comprising: receiving (108) reception statistics associated with the first and/or second pre-coding mode(s) from the remote TNode; and wherein obtaining (110) a capability of the remote multi-antenna transmitter and receiver arrangement comprises deriving (111) the capability of the remote multi-antenna transmitter and receiver arrangement from the received reception statistics.
  • a computer program product comprising a non-transitory computer readable medium (200), having stored thereon a computer program comprising program instructions, the computer program being loadable into a data processing unit (220) and configured to cause execution of the method of any of examples 1-9 when the computer program is run by the data processing unit.
  • a wireless device, WD comprising a multi-antenna transmitter and receiver arrangement (400) and controlling circuitry configured to cause: obtainment (310) of a capability of a remote multi-antenna transmitter and receiver arrangement comprised in a remote TNode, wherein the obtained capability is indicative of a first or second spatio-temporal dispersion the remote multi-antenna transmitter and receiver arrangement is able to manage, the first spatio-temporal dispersion being smaller than the second spatio-temporal dispersion; and pre-coding (320) of one or more data packet(s) to be transmitted to the remote TNode based on the obtained capability.
  • any method disclosed herein do not have to be performed in the exact order disclosed, unless a step is explicitly described as following or preceding another step and/or where it is implicit that a step must follow or precede another step.
  • the partition of functional blocks into particular units is by no means intended as limiting. Contrarily, these partitions are merely examples. Functional blocks described herein as one unit may be split into two or more units. Furthermore, functional blocks described herein as being implemented as two or more units may be merged into fewer e.g., a single) unit. Any feature of any of the embodiments/aspects disclosed herein may be applied to any other embodiment/aspect, wherever suitable.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé (100) d'agencement d'émetteur et de récepteur à antennes multiples (400), l'agencement d'émetteur et de récepteur à antennes multiples (400) pouvant être inclus dans un dispositif sans fil, WD, ou dans un nœud émetteur-récepteur, TNœud, le procédé comprenant : l'obtention (110) d'une capacité d'un agencement d'émetteur et de récepteur à antennes multiples à distance compris dans un TNœud distant, la capacité obtenue indiquant une première ou une seconde dispersion spatio-temporelle que l'agencement d'émetteur et de récepteur à antennes multiples à distance est apte à gérer, la première dispersion spatio-temporelle étant plus petite que la seconde dispersion spatio-temporelle ; et le pré-codage (120) d'un ou de plusieurs paquets de données à émettre vers le TNœud distant sur la base de la capacité obtenue. L'invention divulgue également un produit programme d'ordinateur, un dispositif sans fil et un nœud émetteur-récepteur correspondants.
PCT/SE2023/050527 2022-06-10 2023-05-30 Procédé d'obtention d'une capacité et de précodage d'un paquet de données pour un agencement d'émetteur et de récepteur à antennes multiples, produit programme d'ordinateur, support de stockage lisible par ordinateur non transitoire, dispositif sans fil et nœud émetteur-récepteur WO2023239276A1 (fr)

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Citations (6)

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US9054845B2 (en) 2012-08-21 2015-06-09 Fujitsu Limited Radio communication apparatus and signal processing method
US9478857B2 (en) 2012-03-02 2016-10-25 Samsung Electronics Co., Ltd. Apparatus and method for controlling adaptive beamforming gain in wireless communication system
WO2018072699A1 (fr) * 2016-10-17 2018-04-26 中兴通讯股份有限公司 Procédé de détermination de mode de transmission, procédé de transmission de données et appareil associé, et système de communication
US20190305830A1 (en) * 2018-04-03 2019-10-03 Qualcomm Incorporated Feedback of beam repetition and diversity mode
US20210050893A1 (en) 2019-08-16 2021-02-18 Qualcomm Incorporated Multi-beam selection for beamformed multiple input multiple output wireless communications

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US20130045690A1 (en) 2011-08-16 2013-02-21 Samsung Electronics Co., Ltd. Apparatus and method for supporting multi-antenna transmission in beamformed wireless communication system
US9319124B2 (en) 2011-08-16 2016-04-19 Samsung Electronics Co., Ltd Apparatus and method for supporting multi-antenna transmission in beamformed wireless communication system
US9478857B2 (en) 2012-03-02 2016-10-25 Samsung Electronics Co., Ltd. Apparatus and method for controlling adaptive beamforming gain in wireless communication system
US9054845B2 (en) 2012-08-21 2015-06-09 Fujitsu Limited Radio communication apparatus and signal processing method
WO2018072699A1 (fr) * 2016-10-17 2018-04-26 中兴通讯股份有限公司 Procédé de détermination de mode de transmission, procédé de transmission de données et appareil associé, et système de communication
US20190305830A1 (en) * 2018-04-03 2019-10-03 Qualcomm Incorporated Feedback of beam repetition and diversity mode
US20210050893A1 (en) 2019-08-16 2021-02-18 Qualcomm Incorporated Multi-beam selection for beamformed multiple input multiple output wireless communications

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