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WO2025177051A1 - Indicateur de matrice de précodage assisté par des informations de réduction de puissance de faisceau et rapport d'indication de qualité de canal - Google Patents

Indicateur de matrice de précodage assisté par des informations de réduction de puissance de faisceau et rapport d'indication de qualité de canal

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Publication number
WO2025177051A1
WO2025177051A1 PCT/IB2024/063225 IB2024063225W WO2025177051A1 WO 2025177051 A1 WO2025177051 A1 WO 2025177051A1 IB 2024063225 W IB2024063225 W IB 2024063225W WO 2025177051 A1 WO2025177051 A1 WO 2025177051A1
Authority
WO
WIPO (PCT)
Prior art keywords
power backoff
precoder
beams
rank
information
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
PCT/IB2024/063225
Other languages
English (en)
Inventor
Keerthi Kumar NAGALAPUR
Fredrik Athley
Shiwei Gao
Siva Muruganathan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson 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.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of WO2025177051A1 publication Critical patent/WO2025177051A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • 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
    • H04B7/0465—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking power constraints at power amplifier or emission constraints, e.g. constant modulus, 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
    • H04B7/0619—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
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • 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
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • 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
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • 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
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection

Definitions

  • the present disclosure relates, in general, to wireless communications and, more particularly, systems and methods for beam power backoff information-aided Precoding Matrix Indicator (PMI) and Channel Quality Indicator (CQI) reporting.
  • PMI Precoding Matrix Indicator
  • CQI Channel Quality Indicator
  • BACKGROUND Codebook-Based Precoding Multi-antenna techniques can significantly increase the data rates and reliability of a wireless communication system. The performance is in particular improved if both the transmitter and the receiver are equipped with multiple antennas, which results in a multiple-input multiple- output (MIMO) communication channel.
  • MIMO multiple-input multiple- output
  • FIGURE 1 illustrates an example transmission structure of spatial multiplexing in NR.
  • An information carrying symbol vector ⁇ is multiplied by an ⁇ ⁇ ⁇ precoding matrix or precoder ⁇ , which serves to distribute the transmit energy in a subspace of the ⁇ ⁇ dimensional vector space.
  • the precoding matrix is typically selected from a codebook of possible precoding matrices, and typically indicated by means of a precoding matrix indicator (PMI), which specifies a unique precoding matrix in the codebook for a given number of symbol streams.
  • PMI precoding matrix indicator
  • the precoder W can be constant over frequency (i.e., wideband), or frequency selective (i.e., per subband).
  • the precoder W is chosen to match the characteristics of the ⁇ ⁇ ⁇ ⁇ MIMO channel matrix ⁇ ⁇ , resulting in so-called channel dependent precoding. This is also commonly referred to as closed-loop precoding.
  • closed-loop precoding the UE feeds back recommendations on a suitable precoder to the gNodeB (gNB) in the form of a PMI based on downlink channel measurements.
  • the UE is configured with a channel state information (CSI) report configuration including CSI reference signals (CSI-RS) for channel measurements and a codebook of candidate precoders.
  • CSI channel state information
  • the feedback may also include a rank indicator (RI) and one or two channel quality indicators (CQIs).
  • RI, PMI and CQI are part of a CSI feedback.
  • CSI feedback can be either wideband, where one CSI is reported for the entire channel bandwidth, or frequency-selective, where one CSI is reported for each subband, which is defined as a number of contiguous physical resource blocks (PRBs) ranging between 4-32 PRBs depending on the band width part (BWP) size.
  • PRBs physical resource blocks
  • BWP band width part
  • antenna arrays Two-dimensional antenna arrays are widely used and such antenna arrays can be described by a number of antenna ports, ⁇ 1 , in a first dimension (e.g., the horizontal dimension), a number of antenna ports, ⁇ 2 , in the dimension perpendicular to the first dimension (e.g., the vertical dimension), and a number of polarizations ⁇ .
  • the concept of an antenna port is non-limiting in the sense that it can refer to any virtualization (e.g., linear mapping) to the physical antenna elements. For example, pairs of physical antenna elements could be fed the same signal and, thus, share the same virtualized antenna port.
  • Precoding may be interpreted as multiplying the signal to be transmitted by a set of beamforming weights on the antenna ports prior to transmission.
  • a typical approach is to tailor the precoder to the antenna form factor, i.e., taking into account ⁇ 1 , ⁇ 2 and ⁇ ⁇ when designing the precoder codebook.
  • Channel State Information Reference Signals CSI-RS
  • a CSI-RS is transmitted on an antenna port at the gNB and is used by a UE to measure DL channel between the antenna port and each of the UE’s receive antenna ports.
  • the transmit antenna ports are also referred to as CSI-RS ports.
  • the supported number of CSI-RS ports in NR are ⁇ 1,2,4,8,12,16,24,32 ⁇ .
  • a UE can estimate the channel that the CSI-RS is traversing, including the radio propagation channel and antenna gains.
  • the CSI-RS for the above purpose is also referred to as Non-Zero Power (NZP) CSI-RS.
  • NZP Non-Zero Power
  • CSI-RS can be configured to be transmitted in certain REs in a slot and certain slots.
  • FIGURE 3 illustrates an example of CSI-RS RE allocation for 12 antenna ports, where 1RE per Resource Block (RB) per port is shown.
  • interference measurement resource (IMR) is also defined in NR for a UE to measure interference.
  • An IMR resource contains 4 REs, either 4 adjacent RE in frequency in the same OFDM symbol or 2 by 2 adjacent REs in both time and frequency in a slot.
  • a UE can estimate the effective channel and noise plus interference to determine the CSI.
  • a UE in NR may be configured to measure interference based on one or multiple NZP CSI-RS resource.
  • CSI Framework in NR In NR, a UE can be configured with multiple CSI reporting settings and multiple CSI-RS resource settings. Each resource setting can contain multiple resource sets, and each resource set can contain up to 8 CSI-RS resources. For each CSI reporting setting, a UE feeds back a CSI report.
  • Each CSI reporting setting contains at least the following information: ⁇ A CSI-RS resource setting for channel measurement; ⁇ An IMR resource set for interference measurement; ⁇ Optionally, a CSI-RS resource set for interference measurement; ⁇ Time-domain behavior, i.e. periodic, semi-persistent, or aperiodic reporting; ⁇ Frequency granularity, i.e. wideband or subband; ⁇ CSI parameters to be reported such as RI, PMI, CQI, and CSI-RS resource indicator (CRI) in case of multiple CSI-RS resources in a resource set; ⁇ Codebook types, i.e.
  • DFT Discrete Fourier Transform
  • ⁇ is also referred to as a one-dimensional (1-D) DFT vector (1D DFT vector) or beam with beam index k. If the ULA is along the horizontal dimension, each DFT beam points to an azimuth direction. If the ULA is along the vertical dimension, each DFT beam points to an elevation direction. Each precoder corresponds to a DFT beam.
  • ⁇ 1 and ⁇ 2 are the over sampling factors in the two dimensions associated with ⁇ 1 and ⁇ 2 , respectively.
  • ⁇ ⁇ , ⁇ is also referred to as two-dimensional (2D) DFT beam characterized by two beam indices ( ⁇ , ⁇ ), one in each dimension.
  • M-PSK M-ary Phase Shift Keying
  • QPSK Quadrature Phase Shift Keying
  • a precoder matrix for multi-layer transmission may be created by appending columns of Two-Dimensional (2D) DFT vectors.
  • 2D Two-Dimensional
  • An example for 2-layer precoder matrix is given as ( 2) ⁇ v v ⁇ 1 l , m l ⁇ , m ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ .
  • Such DFT-based precoders are used for instance in NR Type I CSI feedback, where each layer is associated with a 2D DFT beam.
  • the NR Type I CSI feedback consisting of such DFT- based precoders is defined in clause 5.2.2.2.1 of 3GPP TS 38.214.
  • a beam, precoding vector, or a 2D-DFT vector ⁇ ⁇ , ⁇ may produce a sidelobe or a grating lobe in an undesired direction with a high spatial gain.
  • Such high gain in undesired directions may create interference to other systems with which the current network/system is co- existing by sharing the same time and frequency resources.
  • the gain in the desired direction may cause interference to other systems.
  • the network may choose to not use the beams/precoding vector/2D-DFT vectors that result in high gains towards the victim system.
  • the network may apply a beams/precoding vector/2D-DFT vector specific power back-off to control the interference towards the other systems with which it co-exists.
  • the network may signal to the UEs the information related to restricted beams and beam specific power backoff that it would apply on the allowed beams. For each beam ⁇ ⁇ , ⁇ indexed through ( ⁇ , ⁇ ), a power backoff, ⁇ ⁇ , ⁇ , may be signaled to the UE.
  • a power backoff may be signaled for a group of beams (i.e., one power backoff for a group of beams for multiple beam groups).
  • ⁇ 1 is of the form .
  • ⁇ ⁇ The matrix ⁇ 2, ⁇ ⁇ C 2 ⁇ is normalized such that each column has a norm of ⁇ 1/ ⁇ , where R is the transmission rank. There currently exist certain challenge(s), however.
  • a UE selects a PMI composed of a set of beams/precoding vectors/2D-DFT vectors for reporting to the network that does not consider any restriction or power backoff that the transmitting node would apply to certain beams/precoding vectors/2D-DFT vectors
  • problems may occur.
  • the UE might select beams that, after power backoff at the network, are suboptimal from utilizing the transmit power.
  • the CQI estimated and reported by the UE is different from the resulting CQI due to power back off applied by the network.
  • a method by a UE is provided for PMI and CQI reporting based on beam power backoff information.
  • the method includes receiving, from a network node, beam power backoff information associated with each of a plurality of beams or DFT vectors associated to a codebook of precoders.
  • Each precoder is associated to a rank, R, and comprises one or more of the plurality of beams or DFT vectors.
  • the UE selects a precoder in the codebook based on: the beam power backoff information; a rank, R, of an associated precoder; and a number of layers to be transmitted on at least one beam.
  • the UE computes a CQI for a CSI report based on: the precoder selected by the UE; the beam power backoff information; the rank, R, of the associated precoder; and the number of layers to be transmitted on the at least one beam.
  • the UE transmits, to the network node, the CSI report, which includes a PMI indicating the selected precoder and the CQI.
  • a UE for PMI and CQI reporting based on beam power backoff information is configured to receive, from a network node, beam power backoff information associated with each of a plurality of beams or DFT vectors associated to a codebook of precoders.
  • Each precoder is associated to a rank, R, and comprises one or more of the plurality of beams or DFT vectors.
  • the UE is configured to select a precoder in the codebook based on: the beam power backoff information; a rank, R, of an associated precoder; and a number of layers to be transmitted on at least one beam.
  • the UE is configured to compute a CQI for a CSI report based on: the precoder selected by the UE; the beam power backoff information; the rank, R, of the associated precoder; and the number of layers to be transmitted on the at least one beam.
  • the UE is configured to transmit, to the network node, the CSI report, which includes a PMI indicating the selected precoder and the CQI.
  • a method by a network node for providing beam power backoff information for PMI and CQI reporting includes transmitting, to a UE, beam power backoff information associated with each of a plurality of beams or DFT vectors associated to a codebook of precoders.
  • Each precoder is associated to a rank, R, and comprises one or more of the plurality of beams or DFT vectors.
  • the network node receives, from the UE, a CSI report including a PMI indicating a precoder selected by the UE based on: the beam power backoff information, a rank, R, of an associated precoder, and a number of layers to be transmitted on at least one beam.
  • the CSI report also includes a CQI based on: the precoder selected by the UE, the beam power backoff information, the rank, R, of the associated precoder, and the number of layers to be transmitted on the at least one beam.
  • a network node for providing beam power backoff information for PMI and CQI reporting is configured to transmit, to a UE, beam power backoff information associated with each of a plurality of beams or DFT vectors associated to a codebook of precoders. Each precoder is associated to a rank, R, and comprises one or more of the plurality of beams or DFT vectors.
  • the network node is configured to receive, from the UE, a CSI report including a PMI indicating a precoder selected by the UE based on: the beam power backoff information, a rank, R, of an associated precoder, and a number of layers to be transmitted on at least one beam.
  • the CSI report also includes a CQI based on: the precoder selected by the UE, the beam power backoff information, the rank, R, of the associated precoder, and the number of layers to be transmitted on the at least one beam.
  • Certain embodiments may provide one or more of the following technical advantage(s). For example, certain embodiments may provide a technical advantage of enabling a UE to select beams/precoding vectors/2D-DFT vectors that, after power backoff at the network, are near optimal from utilizing the transmit power. As another example, certain embodiments may provide a technical advantage of enabling the UE to estimate and report CQI that is closer to the CQI that results due to power back off applied by the network. Other advantages may be readily apparent to one having skill in the art.
  • FIGURE 1 illustrates an example transmission structure of spatial multiplexing in NR
  • FIGURE 3 illustrates an example of CSI-RS RE allocation for 12 antenna ports, where 1RE per Resource Block (RB) per port is shown
  • FIGURE 4 illustrates an example method by a UE for PMI and CQI reporting based on beam power backoff information, according to certain embodiments
  • FIGURE 5 illustrates another example method by a UE for PMI and CQI reporting based on beam power backoff information, according to certain embodiments
  • FIGURE 6 illustrates another example method by a UE for PMI and CQI reporting
  • node can be a network node or a UE.
  • NodeB NodeB, base station (BS), multi-standard radio (MSR) radio node such as MSR BS, eNodeB (eNB), gNodeB (gNB), Master eNB (MeNB), Secondary eNB (SeNB), integrated access backhaul (IAB) node, network controller, radio network controller (RNC), base station controller (BSC), relay, donor node controlling relay, base transceiver station (BTS), Central Unit (e.g. in a gNB), Distributed Unit (e.g.
  • UE user equipment
  • D2D device to device
  • V2V vehicular to vehicular
  • MTC UE machine type communication UE
  • M2M machine to machine
  • PDA Personal Digital Assistant
  • Tablet mobile terminals
  • smart phone laptop embedded equipment
  • LME laptop mounted equipment
  • USB Unified Serial Bus
  • Each SSB carries New Radio-Primary Synchronization Signal (NR-PSS), New Radio- Secondary Synchronization Signal (NR-SSS) and New Radio-Physical Broadcast Channel (NR- PBCH) in four successive symbols.
  • One or multiple Synchronization Signal Blocks (SSBs) are transmitted in one SSB burst which is repeated with certain periodicity such as, for example, 5 ms, 10 ms, 20 ms, 40 ms, 80 ms, and 160 ms.
  • the UE is configured with information about SSB on cells of certain carrier frequency by one or more SS/PBCH block measurement timing configuration (SMTC) configurations.
  • SMTC SS/PBCH block measurement timing configuration
  • the SMTC configuration comprising parameters such as SMTC periodicity, SMTC occasion length in time or duration, SMTC time offset with regard to reference time (e.g., serving cell’s SFN) etc. Therefore, SMTC occasion may also occur with certain periodicity (e.g., 5 ms, 10 ms, 20 ms, 40 ms, 80 ms, and 160 ms).
  • uplink (UL) physical signals are reference signals such as Sounding Reference Signals (SRS), Demodulation Reference Signals (DMRS), etc.
  • SRS Sounding Reference Signals
  • DMRS Demodulation Reference Signals
  • the term physical channel refers to any channel carrying higher layer information e.g. data, control etc.
  • Examples of physical channels are Physical Broadcast Channel (PBCH), Physical Downlink Control Channel (PDCCH), Physical Downlink Shared Channel (PDSCH), Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH), Physical Uplink Shared Channel (PUSCH), Short PUSCH (sPUCCH), Short PDSCH (sPDSCH), Short PUCCH (sPUCCH), Short PUSCH (sPUSCH), MTC PDCCH (MPDCCH), Narrowband PBCH (NPBCH), Narrowband PDCCH (NPDCCH), Narrowband PDSCH (NPDSCH), Narrowband PUSCH (NPUSCH), Enhanced PDCCH (E-PDCCH), etc.
  • time resource used herein may correspond to any type of physical resource or radio resource expressed in terms of length of time. Examples of time resources are symbol, time slot, subframe, radio frame, transmission time interval (TTI), interleaving time, slot, sub-slot, mini- slot, system frame number (SFN) cycle, hyper-SFN (H-SFN) cycle, etc.
  • TTI transmission time interval
  • SFN system frame number
  • H-SFN hyper-SFN
  • a method performed by a UE for PMI and CQI reporting based on beam power backoff information includes receiving, from a network node, information associated with at least one restriction and/or one or more power backoff values for a beam or a group of beams.
  • the network node receives, from the UE, a CQI report comprising at least one of: a PMI determined based on at least one selected beam and the information associated with the at least one restriction and/or the or more power backoff values, and a CQI determined based on at least one power backoff value to be applied by the network node on the at least one selected beam.
  • a UE receives from the network a set of power backoff values, ⁇ ⁇ , ⁇ ⁇ , one for each beam, for all or a subset of the candidate beams/precoding vectors/2D-DFT vectors indexed through ( ⁇ , ⁇ ) as part of the CSI report configuration (or as part of a codebook configuration within the CSI report configuration) and uses the power backoff values in determination of the PMI.
  • a set of power backoff values may be received by the UE from the network wherein each power backoff value is applicable to a group of beams/precoding vectors/2D-DFT vectors.
  • a UE uses the rank, R, of the precoder along with the power backoff value(s) signaled for the candidate beam(s) comprised in the precoder matrix when making a decision to select the candidate beam(s) to compose the precoder matrix that is reported through PMI (where PMI is an index to the precoder matrix).
  • the UE first computes the relative transmit power utilization of all the candidate beams taking into account the respective power backoff values of the candidate beams, and selects L orthogonal beams with the highest relative transmit power utilization for composing the precoder matrix that is reported through PMI.
  • the UE uses the relative transmit power utilization, ⁇ ⁇ , ⁇ , of a beam ⁇ ⁇ , ⁇ and/or the number of layers that are going to be transmitted on the beam for deciding whether to select the beam to compose the precoder matrix that is reported through PMI.
  • ⁇ ⁇ ⁇ 1 ⁇ 2, ⁇
  • ⁇ 1 is a wideband precoder matrix composed of ⁇ beams
  • ⁇ 2 ⁇ is a matrix for subband ⁇ that either linearly combines the beams in ⁇ 1 or contains co- phasing factors corresponding to the ⁇ beams.
  • the scaling operation depends on multiplying a power value, ⁇ ⁇ , ⁇ , by a rank, R, and dividing the result by a number of layers that are transmitted using i-th or DFT vector, ri.
  • the number of b eams, ⁇ may be a the rank ⁇ .
  • a UE also uses the relative bandwidth of PDSCH transmission with respect to the total bandwidth in selecting the candidate beams to compose the precoder matrix that is reported through PMI. For PMI reporting, information of the determined beams of ⁇ 1 ⁇ is reported through PMI.
  • W hen ⁇ 2, ⁇ ⁇ C 2 ⁇ is a matrix for subband n that linearly combines the L beams or contains co- to the L beams in the selected power backoff scaled wideband ⁇ 1 ⁇
  • the channel quality indication (CQI) associated to ⁇ ⁇ is determined using the precoder ⁇ ⁇ that is obtained using the power backoff scaled wideband precoder ⁇ 1 ⁇ .
  • FIGURE 4 illustrates an example method 100 by a UE for PMI and CQI reporting based on beam power backoff information, according to certain embodiments.
  • the method includes a receiving step at 102, a selecting step at 104, a computing step at 106, and a transmitting step at 108.
  • the UE may receive, from a network node, information associated with a restriction and/or one or more power backoff values to be applied to: a beam, precoding vector, and/or 2D-DFT vector, wherein each power backoff value in the one or more power backoff values is applicable to the beam, precoding vector, and/or 2D-DFT vector; and/or a group of beams, precoding vectors, and/or 2D-DFT vectors, wherein each power backoff value in the one or more power backoff values is applicable to a group of beams, precoding vectors, and/or 2D- DFT vectors.
  • the UE may selecting, by the UE, component beams, precoding vectors, and/or 2D-DFT vectors based on the information associated with the restriction and/or the one or more power backoff values to compose a PMI.
  • the UE may compute a CQI for a CSI report based on any power backoff value to be applied by the network node on the selected beams, precoding vectors, and/or 2D-DFT vectors.
  • the UE may transmit, to the network node, the CQI report, the CSI report comprising the PMI and/or the CQI.
  • FIGURE 5 illustrates another example method 200 by a UE for PMI and CQI reporting based on beam power backoff information, according to certain embodiments.
  • the method includes a receiving step at 202 and a transmitting step at 204.
  • the UE may receive, from a network node, information associated with at least one restriction and/or one or more power backoff values for a beam or a group of beams.
  • the UE may transmit, to the network node, a CQI report comprising at least one of: a PMI determined based on at least one selected beam and the information associated with the at least one restriction and/or the or more power backoff values, and a CQI determined based on at least one power backoff value to be applied by the network node on the at least one selected beam.
  • FIGURE 6 illustrates another example method 300 by a UE for PMI and CQI reporting based on beam power backoff information, according to certain embodiments.
  • the method begins at step 302 when the UE receives, from a network node, beam power backoff information associated with each of a plurality of beams or DFT vectors associated to a codebook of precoders.
  • Each precoder is associated to a rank, R, and comprises one or more of the plurality of beams or DFT vectors.
  • the UE selects a precoder in the codebook based on: the beam power backoff information; a rank, R, of an associated precoder; and a number of layers to be transmitted on at least one beam, ⁇ ⁇ , ⁇ .
  • the UE computes a CQI for a CSI report based on: the precoder selected by the beam power backoff information; the rank, R, of the associated precoder; and the number of layers to be transmitted on the at least one beam, ⁇ ⁇ , ⁇ .
  • the UE transmits, to the network node, the CSI report, which includes a PMI the selected precoder and the CQI.
  • the beam power backoff information includes a power backoff value for each of the plurality of beams or DFT vectors.
  • the beam power backoff information comprises a power backoff value for each of a plurality of beam groups, and each of the plurality of beam groups comprises two or more beams or DFT vectors out of the plurality of beams or DFT vectors.
  • a power backoff value for a beam group is applicable to all beams or DFT vectors in the beam group.
  • the beam power backoff information is received in at least one of a CSI report configuration, and a codebook configuration.
  • the UE when selecting the precoder in the codebook and computing the CQI for the CSI report, the UE performs a scaling operation for the at least one beam, ⁇ ⁇ , ⁇ .
  • the scaling operation depends on a power backoff value, ⁇ ⁇ , ⁇ , the rank, R, and the number of layers to be transmitted using an i-th beam or DFT vector, ri.
  • the scaling operation depends on multiplying a power backoff value, ⁇ ⁇ , ⁇ , by the rank, R, and dividing the result by the number of layers to be transmitted using an i-th beam or DFT vector, r i.
  • the UE computes, for a given rank, a relative transmit power utilization, ⁇ ⁇ , ⁇ , of all candidate beams of a precoder taking into account the respective power backoff values of the candidate beams.
  • the UE selects ⁇ orthogonal beams with a highest relative transmit power utilization for composing a precoder matrix that is reported through PMI.
  • the UE selects a set of beams each based on the relative transmit power utilization, ⁇ ⁇ , ⁇ , of the at least one beam, ⁇ ⁇ , ⁇ .
  • FIGURE 7 illustrates an example method 400 by a network node for providing beam power backoff information for PMI and CQI reporting, according to certain embodiments.
  • the method includes a transmitting step at 402 and a receiving step at 404.
  • the network node may transmit, to a UE, information associated with at least one restriction and/or one or more power backoff values for a beam or a group of beams.
  • the network node may receive, from the UE, a CQI report comprising at least one of: a PMI determined based on at least one selected beam and the information associated with the at least one restriction and/or the or more power backoff values, and a CQI determined based on at least one power backoff value to be applied by the network node on the at least one selected beam.
  • FIGURE 8 illustrates another example method 500 by a network node for providing beam power backoff information for PMI and CQI reporting, according to certain embodiments.
  • the method begins at step 402 when the network node transmits, to a UE, beam power backoff information associated with each of a plurality of beams or DFT vectors associated to a codebook of precoders.
  • Each precoder is associated to a rank, R, and comprises one or more of the plurality of beams or DFT vectors.
  • the network node receives, from the UE, a CSI report which includes a PMI indicating a precoder selected by the UE based on: the beam power backoff information, a rank, R, of an associated precoder, and a number of layers to be transmitted on at least one beam, ⁇ ⁇ , ⁇ .
  • the CSI report also includes a CQI based on: the precoder selected by the UE, the beam power backoff information, the rank, R, of the associated precoder, and the number of layers to be transmitted on the at least one beam, ⁇ ⁇ , ⁇ .
  • the network node configures the UE to select the precoder in the codebook based on: the beam power backoff information, the rank, R, of the associated precoder, and the number of layers to be transmitted on the at least one beam, ⁇ ⁇ , ⁇ .
  • the network node configures the UE to compute a CQI based on: the precoder selected by the UE, the beam power backoff information, the rank, R, of the associated precoder, and the number of layers to be transmitted on the at least one beam, ⁇ ⁇ , ⁇ .
  • configuring the UE to select the precoder in the codebook and/or compute the CQI for the CSI report includes configuring the UE to perform a scaling operation for the at least one beam, ⁇ ⁇ , ⁇ . The scaling operation depends on a power backoff value, ⁇ ⁇ , ⁇ , the rank, R, and the number of layers to be transmitted using an i-th beam or DFT vector, ri.
  • the scaling operation depends on multiplying a power backoff value, ⁇ ⁇ , ⁇ , by the rank, R, and dividing the result by the number of layers to be transmitted using an beam or DFT vector, r i.
  • the beam power backoff information comprises a power backoff value for each of the plurality of beams or DFT vectors.
  • the beam power backoff information comprises a power backoff value for each of a plurality of beam groups, and each of the plurality of beam groups comprises two or more beams or DFT vectors out of the plurality of beams or DFT vectors.
  • a power backoff value for a beam group is applicable to all beams or DFT vectors in the beam group.
  • the beam power backoff information is transmitted in at least one of a CSI report configuration and a codebook configuration.
  • FIGURE 9 shows an example of a communication system 600 in accordance with some embodiments.
  • the communication system 600 includes a telecommunication network 602 that includes an access network 604, such as a radio access network (RAN), and a core network 606, which includes one or more core network nodes 608.
  • the access network 604 includes one or more access network nodes, such as network nodes 610a and 610b (one or more of which may be generally referred to as network nodes 610), or any other similar 3rd Generation Partnership Project (3GPP) access node or non-3GPP access point.
  • 3GPP 3rd Generation Partnership Project
  • the network nodes 610 facilitate direct or indirect connection of user equipment (UE), such as by connecting UEs 612a, 612b, 612c, and 612d (one or more of which may be generally referred to as UEs 612) to the core network 606 over one or more wireless connections.
  • UE user equipment
  • Example wireless communications over a wireless connection include transmitting and/or receiving wireless signals using electromagnetic waves, radio waves, infrared waves, and/or other types of signals suitable for conveying information without the use of wires, cables, or other material conductors.
  • the communication system 600 may include any number of wired or wireless networks, network nodes, UEs, and/or any other components or systems that may facilitate or participate in the communication of data and/or signals whether via wired or wireless connections.
  • the communication system 600 may include and/or interface with any type of communication, telecommunication, data, cellular, radio network, and/or other similar type of system.
  • the UEs 612 may be any of a wide variety of communication devices, including wireless devices arranged, configured, and/or operable to communicate wirelessly with the network nodes 610 and other communication devices.
  • the network nodes 610 are arranged, capable, configured, and/or operable to communicate directly or indirectly with the UEs 612 and/or with other network nodes or equipment in the telecommunication network 602 to enable and/or provide network access, such as wireless network access, and/or to perform other functions, such as administration in the telecommunication network 602.
  • the core network 606 connects the network nodes 610 to one or more hosts, such as host 616. These connections may be direct or indirect via one or more intermediary networks or devices. In other examples, network nodes may be directly coupled to hosts.
  • the core network 606 includes one more core network nodes (e.g., core network node 608) that are structured with hardware and software components. Features of these components may be substantially similar to those described with respect to the UEs, network nodes, and/or hosts, such that the descriptions thereof are generally applicable to the corresponding components of the core network node 608.
  • Example core network nodes include functions of one or more of a Mobile Switching Center (MSC), Mobility Management Entity (MME), Home Subscriber Server (HSS), Access and Mobility Management Function (AMF), Session Management Function (SMF), Authentication Server Function (AUSF), Subscription Identifier De-concealing function (SIDF), Unified Data Management (UDM), Security Edge Protection Proxy (SEPP), Network Exposure Function (NEF), and/or a User Plane Function (UPF).
  • the host 616 may be under the ownership or control of a service provider other than an operator or provider of the access network 604 and/or the telecommunication network 602, and may be operated by the service provider or on behalf of the service provider.
  • the host 616 may host a variety of applications to provide one or more service.
  • Examples of such applications include live and pre-recorded audio/video content, data collection services such as retrieving and compiling data on various ambient conditions detected by a plurality of UEs, analytics functionality, social media, functions for controlling or otherwise interacting with remote devices, functions for an alarm and surveillance center, or any other such function performed by a server.
  • data collection services such as retrieving and compiling data on various ambient conditions detected by a plurality of UEs
  • analytics functionality such as retrieving and compiling data on various ambient conditions detected by a plurality of UEs
  • social media such as a plurality of UEs
  • functions for controlling or otherwise interacting with remote devices functions for an alarm and surveillance center, or any other such function performed by a server.
  • the communication system 600 of FIGURE 9 enables connectivity between the UEs, network nodes, and hosts.
  • the communication system may be configured to operate according to predefined rules or procedures, such as specific standards that include, but are not limited to: Global System for Mobile Communications (GSM); Universal Mobile Telecommunications System (UMTS); Long Term Evolution (LTE), and/or other suitable 2G, 3G, 4G, 5G standards, or any applicable future generation standard (e.g., 6G); wireless local area network (WLAN) standards, such as the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standards (WiFi); and/or any other appropriate wireless communication standard, such as the Worldwide Interoperability for Microwave Access (WiMax), Bluetooth, Z-Wave, Near Field Communication (NFC) ZigBee, LiFi, and/or any low-power wide-area network (LPWAN) standards such as LoRa and Sigfox.
  • GSM Global System for Mobile Communications
  • UMTS Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • 6G wireless local area network
  • WiFi wireless local area network
  • WiMax Worldwide Interoperability for Micro
  • a UE may be designed to transmit information to the access network 604 on a predetermined schedule, when triggered by an internal or external event, or in response to requests from the access network 604.
  • a UE may be configured for operating in single- or multi-RAT or multi-standard mode.
  • a UE may operate with any one or combination of Wi-Fi, NR (New Radio) and LTE, i.e. being configured for multi-radio dual connectivity (MR-DC), such as E-UTRAN (Evolved-UMTS Terrestrial Radio Access Network) New Radio – Dual Connectivity (EN-DC).
  • MR-DC multi-radio dual connectivity
  • Commands or instructions may be received from the UEs, network nodes 610, or by executable code, script, process, or other instructions in the hub 614.
  • the hub 614 may be a data collector that acts as temporary storage for UE data and, in some embodiments, may perform analysis or other processing of the data.
  • the hub 614 may be a content source. For example, for a UE that is a VR headset, display, loudspeaker or other media delivery device, the hub 614 may retrieve VR assets, video, audio, or other media or data related to sensory information via a network node, which the hub 614 then provides to the UE either directly, after performing local processing, and/or after adding additional local content.
  • the hub 614 acts as a proxy server or orchestrator for the UEs, in particular in if one or more of the UEs are low energy IoT devices.
  • the hub 614 may have a constant/persistent or intermittent connection to the network node 610b.
  • the hub 614 may also allow for a different communication scheme and/or schedule between the hub 614 and UEs (e.g., UE 612c and/or 612d), and between the hub 614 and the core network 606.
  • the hub 614 is connected to the core network 606 and/or one or more UEs via a wired connection.
  • Examples of an input device include a touch-sensitive or presence-sensitive display, a camera (e.g., a digital camera, a digital video camera, a web camera, etc.), a microphone, a sensor, a mouse, a trackball, a directional pad, a trackpad, a scroll wheel, a smartcard, and the like.
  • the presence-sensitive display may include a capacitive or resistive touch sensor to sense input from a user.
  • a sensor may be, for instance, an accelerometer, a gyroscope, a tilt sensor, a force sensor, a magnetometer, an optical sensor, a proximity sensor, a biometric sensor, etc., or any combination thereof.
  • An output device may use the same type of interface port as an input device.
  • the UE may comprise a motor that adjusts the control surfaces or rotors of a drone in flight according to the received input or to a robotic arm performing a medical procedure according to the received input.
  • a UE when in the form of an Internet of Things (IoT) device, may be a device for use in one or more application domains, these domains comprising, but not limited to, city wearable technology, extended industrial application and healthcare.
  • IoT Internet of Things
  • Non-limiting examples of such an IoT device are a device which is or which is embedded in: a connected refrigerator or freezer, a TV, a connected lighting device, an electricity meter, a robot vacuum cleaner, a voice controlled smart speaker, a home security camera, a motion detector, a thermostat, a smoke detector, a door/window sensor, a flood/moisture sensor, an electrical door lock, a connected doorbell, an air conditioning system like a heat pump, an autonomous vehicle, a surveillance system, a weather monitoring device, a vehicle parking monitoring device, an electric vehicle charging station, a smart watch, a fitness tracker, a head-mounted display for Augmented Reality (AR) or Virtual Reality (VR), a wearable for tactile augmentation or sensory enhancement, a water sprinkler, an animal- or item- tracking device, a sensor for monitoring a plant or animal, an industrial robot, an Unmanned Aerial Vehicle (UAV), and any kind of medical device, like a heart rate monitor or a remote controlled surgical robot.
  • UAV Unmanned
  • a UE may represent a vehicle, such as a car, a bus, a truck, a ship and an airplane, or other equipment that is capable of monitoring and/or reporting on its operational status or other functions associated with its operation.
  • a first UE might be or be integrated in a drone and provide the drone’s speed information (obtained through a speed sensor) to a second UE that is a remote controller operating the drone.
  • the first UE may adjust the throttle on the drone (e.g. by controlling an actuator) to increase or decrease the drone’s speed.
  • the first and/or the second UE can also include more than one of the functionalities described above.
  • a UE might comprise the sensor and the actuator, and handle communication of data for both the speed sensor and the actuators.
  • FIGURE 11 shows a network node 800, which may be an embodiment of the network node 610 of FIGURE 10, in accordance with some embodiments.
  • network node refers to equipment capable, configured, arranged and/or operable to communicate directly or indirectly with a UE and/or with other network nodes or equipment, in a telecommunication network.
  • network nodes include, but are not limited to, access points (APs) (e.g., radio access points), base stations (BSs) (e.g., radio base stations, Node Bs, evolved Node Bs (eNBs) and NR NodeBs (gNBs)).
  • Base stations may be categorized based on the amount of coverage they provide (or, stated differently, their transmit power level) and so, depending on the provided amount of coverage, may be referred to as femto base stations, pico base stations, micro base stations, or macro base stations.
  • a base station may be a relay node or a relay donor node controlling a relay.
  • a network node may also include one or more (or all) parts of a distributed radio base station such as centralized digital units and/or remote radio units (RRUs), sometimes referred to as Remote Radio Heads (RRHs). Such remote radio units may or may not be integrated with an antenna as an antenna integrated radio. Parts of a distributed radio base station may also be referred to as nodes in a distributed antenna system (DAS).
  • DAS distributed antenna system
  • network nodes include multiple transmission point (multi-TRP) 5G access nodes, multi-standard radio (MSR) equipment such as MSR BSs, network controllers such as radio network controllers (RNCs) or base station controllers (BSCs), base transceiver stations (BTSs), transmission points, transmission nodes, multi-cell/multicast coordination entities (MCEs), Operation and Maintenance (O&M) nodes, Operations Support System (OSS) nodes, Self-Organizing Network (SON) nodes, positioning nodes (e.g., Evolved Serving Mobile Location Centers (E-SMLCs)), and/or Minimization of Drive Tests (MDTs).
  • MSR multi-standard radio
  • RNCs radio network controllers
  • BSCs base station controllers
  • BTSs base transceiver stations
  • OFDM Operation and Maintenance
  • OSS Operations Support System
  • SON Self-Organizing Network
  • positioning nodes e.g., Evolved Serving Mobile Location Centers (E-SMLCs)
  • the network node 800 includes a processing circuitry 802, a memory 804, a communication interface 806, and a power source 808.
  • the network node 800 may be composed of multiple physically separate components (e.g., a NodeB component and a RNC component, or a BTS component and a BSC component, etc.), which may each have their own respective components.
  • the network node 800 comprises multiple separate components (e.g., BTS and BSC components)
  • one or more of the separate components may be shared among several network nodes.
  • a single RNC may control multiple NodeBs.
  • each unique NodeB and RNC pair may in some instances be considered a single separate network node.
  • the processing circuitry 802 may comprise a combination of one or more of a microprocessor, controller, microcontroller, central processing unit, digital signal processor, application-specific integrated circuit, field programmable gate array, or any other suitable computing device, resource, or combination of hardware, software and/or encoded logic operable to provide, either alone or in conjunction with other network node 800 components, such as the memory 804, to provide network node 800 functionality.
  • the processing circuitry 802 includes a system on a chip (SOC).
  • the processing circuitry 802 includes one or more of radio frequency (RF) transceiver circuitry 812 and baseband processing circuitry 814.
  • RF radio frequency
  • the radio frequency (RF) transceiver circuitry 812 and the baseband processing circuitry 814 may be on separate chips (or sets of chips), boards, or units, such as radio units and digital units. In alternative embodiments, part or all of RF transceiver circuitry 812 and baseband processing circuitry 814 may be on the same chip or set of chips, boards, or units.
  • the memory 804 may store any suitable instructions, data, or information, including a computer program, software, an application including one or more of logic, rules, code, tables, and/or other instructions capable of being executed by the processing circuitry 802 and utilized by the network node 800.
  • the memory 804 may be used to store any calculations made by the processing circuitry 802 and/or any data received via the communication interface 806.
  • the processing circuitry 802 and memory 804 is integrated.
  • the communication interface 806 is used in wired or wireless communication of signaling and/or data between a network node, access network, and/or UE. As illustrated, the communication interface 806 comprises port(s)/terminal(s) 816 to send and receive data, for example to and from a network over a wired connection.
  • the communication interface 806 also includes radio front- end circuitry 818 that may be coupled to, or in certain embodiments a part of, the antenna 810.
  • Radio front-end circuitry 818 comprises filters 820 and amplifiers 822.
  • the radio front-end circuitry 818 may be connected to an antenna 810 and processing circuitry 802.
  • the radio front- end circuitry may be configured to condition signals communicated between antenna 810 and processing circuitry 802.
  • the radio front-end circuitry 818 may receive digital data that is to be sent out to other network nodes or UEs via a wireless connection.
  • the radio front-end circuitry 818 may convert the digital data into a radio signal having the appropriate channel and bandwidth parameters using a combination of filters 820 and/or amplifiers 822.
  • the radio signal may then be transmitted via the antenna 810.
  • the antenna 810 may collect radio signals which are then converted into digital data by the radio front-end circuitry 818.
  • the digital data may be passed to the processing circuitry 802.
  • the communication interface may comprise different components and/or different combinations of components.
  • the network node 800 does not include separate radio front-end circuitry 818, instead, the processing circuitry 802 includes radio front-end circuitry and is connected to the antenna 810.
  • all or some of the RF transceiver circuitry 812 is part of the communication interface 806.
  • the communication interface 806 includes one or more ports or terminals 816, the radio front-end circuitry 818, and the RF transceiver circuitry 812, as part of a radio unit (not shown), and the communication interface 806 communicates with the baseband processing circuitry 814, which is part of a digital unit (not shown).
  • the antenna 810 may include one or more antennas, or antenna arrays, configured to send and/or receive wireless signals.
  • the antenna 810 may be coupled to the radio front-end circuitry 818 and may be any type of antenna capable of transmitting and receiving data and/or signals wirelessly. In certain embodiments, the antenna 810 is separate from the network node 800 and connectable to the network node 800 through an interface or port.
  • the antenna 810, communication interface 806, and/or the processing circuitry 802 may be configured to perform any receiving operations and/or certain obtaining operations described herein as being performed by the network node. Any information, data and/or signals may be received from a UE, another network node and/or any other network equipment. Similarly, the antenna 810, the communication interface 806, and/or the processing circuitry 802 may be configured to perform any transmitting operations described herein as being performed by the network node. Any information, data and/or signals may be transmitted to a UE, another network node and/or any other network equipment.
  • the power source 808 provides power to the various components of network node 800 in a form suitable for the respective components (e.g., at a voltage and current level needed for each respective component).
  • the power source 808 may further comprise, or be coupled to, power management circuitry to supply the components of the network node 800 with power for performing the functionality described herein.
  • the network node 800 may be connectable to an external power source (e.g., the power grid, an electricity outlet) via an input circuitry or interface such as an electrical cable, whereby the external power source supplies power to power circuitry of the power source 808.
  • the power source 808 may comprise a source of power in the form of a battery or battery pack which is connected to, or integrated in, power circuitry. The battery may provide backup power should the external power source fail.
  • hardware 904 is coupled to one or more radio units that each include one or more transmitters and one or more receivers that may be coupled to one or more antennas. Radio units may communicate directly with other hardware nodes via one or more appropriate network interfaces and may be used in combination with the virtual components to provide a virtual node with radio capabilities, such as a radio access node or a base station. In some embodiments, some signaling can be provided with the use of a control system 912 which may alternatively be used for communication between hardware nodes and radio units.
  • computing devices described herein may include the illustrated combination of hardware components, other embodiments may comprise computing devices with different combinations of components. It is to be understood that these computing devices may comprise any suitable combination of hardware and/or software needed to perform the tasks, features, functions and methods disclosed herein. Determining, calculating, obtaining or similar operations described herein may be performed by processing circuitry, which may process information by, for example, converting the obtained information into other information, comparing the obtained information or converted information to information stored in the network node, and/or performing one or more operations based on the obtained information or converted information, and as a result of said processing making a determination.
  • processing circuitry may process information by, for example, converting the obtained information into other information, comparing the obtained information or converted information to information stored in the network node, and/or performing one or more operations based on the obtained information or converted information, and as a result of said processing making a determination.
  • processing circuitry executing instructions stored on in memory, which in certain embodiments may be a computer program product in the form of a non-transitory computer-readable storage medium.
  • some or all of the functionality may be provided by the processing circuitry without executing instructions stored on a separate or discrete device-readable storage medium, such as in a hard-wired manner.
  • the processing circuitry can be configured to perform the described functionality.
  • Example Embodiment A1 A method performed by a user equipment for PMI and CQI reporting based on beam power backoff information, the method comprising: any of the user equipment steps, features, or functions described above, either alone or in combination with other steps, features, or functions described above.
  • Example Embodiment A2. The method of the previous embodiment, further comprising one or more additional user equipment steps, features or functions described above.
  • Example Embodiments Example Embodiment B1. A method performed by a network node for providing beam power backoff information for PMI and CQI reporting, the method comprising: any of the network node steps, features, or functions described above, either alone or in combination with other steps, features, or functions described above.
  • Example Embodiment B3. The method of any of the previous embodiments, further comprising: obtaining user data; and forwarding the user data to a host or a user equipment.
  • a method performed by a user equipment (UE) for PMI and CQI reporting based on beam power backoff information comprising: receiving, from a network node, information associated with a restriction and/or one or more power backoff values to be applied to: a beam, precoding vector, and/or 2D-DFT vector, wherein each power backoff value in the one or more power backoff values is applicable to the beam, precoding vector, and/or 2D-DFT vector; and/or a group of beams, precoding vectors, and/or 2D-DFT vectors, wherein each power backoff value in the one or more power backoff values is applicable to a group of beams, precoding vectors, and/or 2D-DFT vectors; selecting, by the UE, component beams, precoding vectors, and/or 2D-DFT vectors based on the information associated with the restriction and/or the one or more power backoff values to compose a PMI; computing a
  • Example embodiment C2 The method of Example Embodiment C1, wherein the PMI comprises an index of the precoder matrix that is reported as part of a CSI report.
  • Example Embodiment C3. The method of any one of Example Embodiments C1 to C2, wherein each power backoff value in the one or more power backoff values is applicable to one beam, precoding vector, or 2D-DFT vector.
  • Example Embodiment C4. The method of any one of Example Embodiments C1 to C2, wherein each power backoff value in the one or more power backoff values is applicable to a group of beams, a group precoding vectors, or a group of 2D-DFT vectors.
  • Example Embodiment C4 The method of any one of Example Embodiments C1 to C4, wherein the information associated with a restriction and/or one or more power backoff values is received in at least one of a CSI report configuration and a codebook configuration.
  • Example Embodiment C6 The method of any one of Example Embodiments C1 to C5, wherein selecting the component beams, precoding vectors, and/or 2D-DFT vectors based on the information comprises using a rank, R, of a precoder and the one or more power backoff values for the candidate beams in a precoder matrix.
  • Example Embodiment C7 Example Embodiment C7.
  • Example Embodiments C1 to C6 comprising: computing a relative transmit power utilization of all candidate beams taking into account the respective power backoff values of the candidate beams, and selecting ⁇ orthogonal beams with a highest relative transmit power utilization for composing a precoder matrix that is reported through PMI.
  • Example Embodiment C8 comprising: computing a relative transmit power utilization of all candidate beams taking into account the respective power backoff values of the candidate beams, and selecting ⁇ orthogonal beams with a highest relative transmit power utilization for composing a precoder matrix that is reported through PMI.
  • Example Embodiment C10 comprising using a relative bandwidth of a PDSCH transmission with respect to a total bandwidth when selecting the candidate beams to compose a precoder matrix that is reported through PMI.
  • Example Embodiment C12 The method of any one of Example Embodiments C1 to C11, wherein the CQI associated to ⁇ ⁇ is determined using the precoder ⁇ ⁇ that is obtained using the power backoff scaled wideband precoder ⁇ 1 ⁇ .
  • Example Embodiment C13 The method of Example Embodiments C1 to C12, further comprising: providing user data; and forwarding the user data to a host via the transmission to the network node.
  • Example Embodiment C14 Example Embodiment C14.
  • a user equipment comprising processing circuitry configured to perform any of the methods of Example Embodiments C1 to C13.
  • Example Embodiment C15 A user equipment configured to perform any of the methods of Example Embodiments C1 to C13.
  • Example Embodiment C16. A wireless device comprising processing circuitry configured to perform any of the methods of Example Embodiments C1 to C13.
  • Example Embodiment C17. A computer program comprising instructions which when executed on a computer perform any of the methods of Example Embodiments C1 to C13.
  • Example Embodiment C18. A computer program product comprising computer program, the computer program comprising instructions which when executed on a computer perform any of the methods of Example Embodiments C1 to C13.
  • a non-transitory computer readable medium storing instructions which when executed by a computer perform any of the methods of Example Embodiments C1 to 13. Group D Example Embodiments Example Embodiment D1.
  • a method performed by a user equipment (UE) for PMI and CQI reporting based on beam power backoff information comprising: receiving, from a network node, information associated with at least one restriction and/or one or more power backoff values for a beam or a group of beams; transmitting, to the network node, a CQI report comprising at least one of: a PMI determined based on at least one selected beam and the information associated with the at least one restriction and/or the or more power backoff values, and a CQI determined based on at least one power backoff value to be applied by the network node on the at least one selected beam.
  • UE user equipment
  • Example embodiment D2 The method of Example Embodiment D1, comprising: selecting the at least one beam based on the information related to restriction or one or more power backoff values; and composing the PMI based on the selected at least one beam.
  • Example Embodiment D3. The method of Example Embodiment D2, wherein the PMI comprises an index of the precoder matrix that is reported as part of a CSI report.
  • Example Embodiment D4. The method of any one of Example Embodiments D2 to D3, wherein selecting the at least one beam based on the information comprises using a rank, R, of a precoder and the one or more power backoff values for candidate beams in a precoder matrix.
  • Example Embodiments D2 to D4 comprising: computing a relative transmit power utilization of all candidate beams taking into account the respective power backoff values of the candidate beams, and selecting ⁇ orthogonal beams with a highest relative transmit power utilization for composing a precoder matrix that is reported through PMI.
  • Example Embodiments D2 to D8 comprising using a relative bandwidth of a PDSCH transmission with respect to a total bandwidth when selecting the at least one beam to compose a precoder matrix that is reported through PMI.
  • Example Embodiment D10 The method of any one of Example Embodiments D1 to D9, comprising: computing the CQI based on the power backoff value to be applied by the network node on the at least one selected beam.
  • Example Embodiment D11 The method of any one of Example Embodiments D1 to D10, wherein the CQI associated to ⁇ ⁇ is determined using a precoder ⁇ ⁇ that is obtained using a power backoff scaled wideband precoder ⁇ 1 ⁇ .
  • Example Embodiment D12 The method of any one of Example Embodiments D1 to D11, wherein each power backoff value in the one or more power backoff values is applicable to one beam.
  • Example Embodiment D13 The method of any one of Example Embodiments D1 to D11, wherein each power backoff value in the one or more power backoff values is applicable to a group of beams.
  • Example Embodiment D14 The method of any one of Example Embodiments D1 to D13, wherein the information associated with a restriction and/or one or more power backoff values is received in at least one of a CSI report configuration and a codebook configuration.
  • Example Embodiment D15 The method of any one of Example Embodiments D1 to D11, wherein each power backoff value in the one or more power backoff values is applicable to one beam.
  • Example Embodiment D14 The method of any one of Example Embodiments D1 to D13, wherein the information associated with a restriction and/or one or more power back
  • Example Embodiment D14 The method of any one of Example Embodiments D1 to D14, wherein the beam comprises: a candidate beam, a precoding vector, a 2D-DFT vector, a 1D- DFT vector, and a spatial beam.
  • Example Embodiment D16 The method of any one of Example Embodiments D1 to D15, wherein the group of beam comprises: a group of candidate beams, a group of precoding vectors, a group of 2D-DFT vectors, a group of 1D-DFT vectors, and a group of spatial beams.
  • Example Embodiment D17 The method of Example Embodiments D1 to D16, further comprising: providing user data; and forwarding the user data to a host via the transmission to the network node.
  • Example Embodiment D18 A user equipment comprising processing circuitry configured to perform any of the methods of Example Embodiments D1 to D17.
  • Example Embodiment D19 A user equipment configured to perform any of the methods of Example Embodiments D1 to D17.
  • Example Embodiment D20 A wireless device comprising processing circuitry configured to perform any of the methods of Example Embodiments D1 to D17.
  • Example Embodiment D21 A computer program comprising instructions which when executed on a computer perform any of the methods of Example Embodiments D1 to D17.
  • Example Embodiment D22 A computer program product comprising computer program, the computer program comprising instructions which when executed on a computer perform any of the methods of Example Embodiments D1 to D17.
  • Example Embodiment D23 A non-transitory computer readable medium storing instructions which when executed by a computer perform any of the methods of Example Embodiments D1 to D17.
  • Group E Example Embodiments Example Embodiment E1.
  • Example Embodiment E2 The method of Example Embodiment E2, wherein the PMI comprises an index of a precoder matrix that is reported as part of the CSI report.
  • Example Embodiment E3. The method of any one of Example Embodiments E1 to E2, wherein each power backoff value in the one or more power backoff values is applicable to one beam.
  • Example Embodiment E4. The method of any one of Example Embodiments E1 to E2, wherein each power backoff value in the one or more power backoff values is applicable to a group of beams.
  • Example Embodiment E6 The method of any one of Example Embodiments E1 to E5, wherein the beam comprises: a candidate beam, a precoding vector, a 2D-DFT vector, a 1D-DFT vector, and a spatial beam.
  • Example Embodiment E7 The method of any one of Example Embodiments E1 to E4, wherein the information associated with a restriction and/or one or more power backoff values is transmitted in at least one of a CSI report configuration and a codebook configuration.
  • Example Embodiment E5 The method of any one of Example Embodiments E1 to E5, wherein the group of beam comprises: a group of candidate beams, a group of precoding vectors, a group of 2D-DFT vectors, a group of 1D-DFT vectors, and a group of spatial beams.
  • Example Embodiment E8 The method of any of the previous Example Embodiments, further comprising: obtaining user data; and forwarding the user data to a host or a user equipment.
  • Example Embodiment E9. A network node comprising processing circuitry configured to perform any of the methods of Example Embodiments E1 to E8.
  • Example Embodiment E10. A network node configured to perform any of the methods of Example Embodiments E1 to E8.
  • a computer program comprising instructions which when executed on a computer perform any of the methods of Example Embodiments E1 to E8.
  • Example Embodiment E12. A computer program product comprising computer program, the computer program comprising instructions which when executed on a computer perform any of the methods of Example Embodiments E1 to E8.
  • Example Embodiment E13. A non-transitory computer readable medium storing instructions which when executed by a computer perform any of the methods of Example Embodiments E1 to E8. Group F Example Embodiments Example Embodiment F1.
  • a user equipment for PMI and CQI reporting based on beam power backoff information comprising: processing circuitry configured to perform any of the steps of any of the Group A, C, and D Example Embodiments; and power supply circuitry configured to supply power to the processing circuitry.
  • Example Embodiment F2. A network node for providing beam power backoff information for PMI and CQI reporting, the network node comprising: processing circuitry configured to perform any of the steps of any of the Group B and E Example Embodiments; power supply circuitry configured to supply power to the processing circuitry.
  • a user equipment (UE) for PMI and CQI reporting based on beam power backoff information comprising: an antenna configured to send and receive wireless signals; radio front-end circuitry connected to the antenna and to processing circuitry, and configured to condition signals communicated between the antenna and the processing circuitry; the processing circuitry being configured to perform any of the steps of any of the Group A, C, and D Example Embodiments; an input interface connected to the processing circuitry and configured to allow input of information into the UE to be processed by the processing circuitry; an output interface connected to the processing circuitry and configured to output information from the UE that has been processed by the processing circuitry; and a battery connected to the processing circuitry and configured to supply power to the UE.
  • Example Embodiment E4 Example Embodiment E4.
  • a host configured to operate in a communication system to provide an over-the-top (OTT) service, the host comprising: processing circuitry configured to provide user data; and a network interface configured to initiate transmission of the user data to a cellular network for transmission to a user equipment (UE), wherein the UE comprises a communication interface and processing circuitry, the communication interface and processing circuitry of the UE being configured to perform any of the steps of any of the Group A, C, and D Example Embodiments to receive the user data from the host.
  • Example Embodiment F5. The host of the previous Example Embodiment, wherein the cellular network further includes a network node configured to communicate with the UE to transmit the user data to the UE from the host.
  • Example Embodiment F6 Example Embodiment F6.
  • Example Embodiment F7 A method implemented by a host operating in a communication system that further includes a network node and a user equipment (UE), the method comprising: providing user data for the UE; and initiating a transmission carrying the user data to the UE via a cellular network comprising the network node, wherein the UE performs any of the operations of any of the Group A embodiments to receive the user data from the host.
  • Example Embodiment F10 The method of the previous Example Embodiment, further comprising: at the host, executing a host application associated with a client application executing on the UE to receive the user data from the UE.
  • Example Embodiment F9. The method of the previous Example Embodiment, further comprising: at the host, transmitting input data to the client application executing on the UE, the input data being provided by executing the host application, wherein the user data is provided by the client application in response to the input data from the host application.
  • a host configured to operate in a communication system to provide an over-the-top (OTT) service, the host comprising: processing circuitry configured to provide user data; and a network interface configured to initiate transmission of the user data to a cellular network for transmission to a user equipment (UE), wherein the UE comprises a communication interface and processing circuitry, the communication interface and processing circuitry of the UE being configured to perform any of the steps of any of the Group A, C, and D Example Embodiments to transmit the user data to the host.
  • Example Embodiment F11 The host of the previous Example Embodiment, wherein the cellular network further includes a network node configured to communicate with the UE to transmit the user data from the UE to the host.
  • Example Embodiment F15 The method of the previous Example Embodiment, further comprising: at the host, transmitting input data to the client application executing on the UE, the input data being provided by executing the host application, wherein the user data is provided by the client application in response to the input data from the host application.
  • Example Embodiment F16 The method of the previous Example Embodiment, further comprising: at the host, transmitting input data to the client application executing on the UE, the input data being provided by executing the host application, wherein the user data is provided by the client application in response to the input data from the host application.
  • a host configured to operate in a communication system to provide an over-the-top (OTT) service, the host comprising: processing circuitry configured to provide user data; and a network interface configured to initiate transmission of the user data to a network node in a cellular network for transmission to a user equipment (UE), the network node having a communication interface and processing circuitry, the processing circuitry of the network node configured to perform any of the operations of any of the Group B and D Example Embodiments to transmit the user data from the host to the UE.
  • Example Embodiment F17 Example Embodiment F17.
  • Example Embodiment F18 A method implemented in a host configured to operate in a communication system that further includes a network node and a user equipment (UE), the method comprising: providing user data for the UE; and initiating a transmission carrying the user data to the UE via a cellular network comprising the network node, wherein the network node performs any of the operations of any of the Group B and D Example Embodiments to transmit the user data from the host to the UE.
  • Example Embodiment F19 A method implemented in a host configured to operate in a communication system that further includes a network node and a user equipment (UE), the method comprising: providing user data for the UE; and initiating a transmission carrying the user data to the UE via a cellular network comprising the network node, wherein the network node performs any of the operations of any of the Group B and D Example Embodiments to transmit the user data from the host to the UE.
  • Example Embodiment F20 The method of any of the previous 2 Example Embodiments, wherein the user data is provided at the host by executing a host application that interacts with a client application executing on the UE, the client application being associated with the host application.
  • Example Embodiment F21 The method of any of the previous 2 Example Embodiments, wherein the user data is provided at the host by executing a host application that interacts with a client application executing on the UE, the client application being associated with the host application.
  • a host configured to operate in a communication system to provide an over-the-top (OTT) service, the host comprising: processing circuitry configured to initiate receipt of user data; and a network interface configured to receive the user data from a network node in a cellular network, the network node having a communication interface and processing circuitry, the processing circuitry of the network node configured to perform any of the operations of any of the Group B and D
  • UE user equipment
  • Example Embodiment F25 The host of the any of the previous 2 Example Embodiments, wherein the initiating receipt of the user data comprises requesting the user data.
  • Example Embodiment F26 The host of the any of the previous 2 Example Embodiments, wherein the initiating receipt of the user data comprises requesting the user data.

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

Abstract

Un procédé (300) mis en œuvre par un équipement utilisateur (UE) (612) est fourni en vue de rapporter un indicateur de matrice de précodage (PMI) et un indicateur de qualité de canal (CQI) sur la base d'informations de réduction de puissance de faisceau. Le procédé consiste à recevoir (302), en provenance d'un nœud de réseau (610), des informations de réduction de puissance de faisceau associées à chacun d'une pluralité de faisceaux ou de vecteurs DFT associés à un livre de codes de précodeurs. Chaque précodeur est associé à un rang (R) et comprend un ou plusieurs de la pluralité de faisceaux ou de vecteurs DFT. L'UE sélectionne (304) un précodeur dans le livre de codes sur la base : des informations de réduction de puissance de faisceau ; d'un rang (R) d'un précodeur associé ; et d'un nombre de couches à transmettre sur au moins un faisceau (vl,m). L'UE calcule (306) un CQI pour un rapport d'informations d'état de canal (CSI) sur la base : du précodeur sélectionné par l'UE ; des informations de réduction de puissance de faisceau ; du rang (R) du précodeur associé ; et du nombre de couches à transmettre sur ledit au moins un faisceau (vl,m). L'UE transmet (308), au nœud de réseau, le rapport de CSI, qui comprend un indicateur de matrice de précodage (PMI), indiquant le précodeur sélectionné et le CQI.
PCT/IB2024/063225 2024-02-19 2024-12-27 Indicateur de matrice de précodage assisté par des informations de réduction de puissance de faisceau et rapport d'indication de qualité de canal Pending WO2025177051A1 (fr)

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Citations (2)

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US20200186207A1 (en) * 2017-06-06 2020-06-11 Intel Corporation Codebook subset restriction for csi
US20220294508A1 (en) * 2019-08-13 2022-09-15 Datang Mobile Communications Equipment Co., Ltd. Beam scheduling method and apparatus, device and storage medium

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Publication number Priority date Publication date Assignee Title
US20200186207A1 (en) * 2017-06-06 2020-06-11 Intel Corporation Codebook subset restriction for csi
US20220294508A1 (en) * 2019-08-13 2022-09-15 Datang Mobile Communications Equipment Co., Ltd. Beam scheduling method and apparatus, device and storage medium

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