WO2021207974A1 - Conservation d'un rapport puissance crête à puissance moyenne (papr) de ports d'antenne d'équipement utilisateur (ue) - Google Patents

Conservation d'un rapport puissance crête à puissance moyenne (papr) de ports d'antenne d'équipement utilisateur (ue) Download PDF

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Publication number
WO2021207974A1
WO2021207974A1 PCT/CN2020/084926 CN2020084926W WO2021207974A1 WO 2021207974 A1 WO2021207974 A1 WO 2021207974A1 CN 2020084926 W CN2020084926 W CN 2020084926W WO 2021207974 A1 WO2021207974 A1 WO 2021207974A1
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WIPO (PCT)
Prior art keywords
pusch
antenna ports
antenna port
layer
indicator
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PCT/CN2020/084926
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English (en)
Inventor
Fang Yuan
Wooseok Nam
Tao Luo
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Qualcomm Incorporated
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Publication date
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Priority to PCT/CN2020/084926 priority Critical patent/WO2021207974A1/fr
Publication of WO2021207974A1 publication Critical patent/WO2021207974A1/fr

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    • 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
    • H04B7/0628—Diversity capabilities

Definitions

  • This disclosure relates generally to wireless communications and, more specifically, to preserving a peak-to-average power ratio (PAPR) of user equipment (UE) antenna ports used for uplink (UL) transmissions.
  • PAPR peak-to-average power ratio
  • Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (such as time, frequency, and power) .
  • multiple-access systems include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, and orthogonal frequency division multiple access (OFDMA) systems (such as a Long Term Evolution (LTE) system or a Fifth Generation (5G) New Radio (NR) system) .
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • LTE Long Term Evolution
  • NR Fifth Generation
  • a wireless multiple-access communications system may include a number of base stations or access network nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .
  • UE user equipment
  • 5G New Radio NR
  • 3GPP Third Generation Partnership Project
  • 5G NR includes services associated with enhanced mobile broadband (eMBB) , massive machine type communications (mMTC) , and ultra-reliable low latency communications (URLLC) .
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communications
  • URLLC ultra-reliable low latency communications
  • the method may be performed by a user equipment (UE) , and may include indicating a UE capability of supporting transmission precoding matrices configured to preserve a peak-to-average power ratio (PAPR) of each UE antenna port used for uplink (UL) transmissions, receiving a first indicator identifying a subset of transmit precoding matrix identifiers (TPMIs) of a set of TPMIs based at least in part on the indicated UE capability, receiving a second indicator identifying a TPMI of the subset of TPMIs, determining a precoding matrix based at least in part on the identified TPMI, and transmitting a physical uplink shared channel (PUSCH) using a set of UE antenna ports according to the determined precoding matrix.
  • the subset of TPMIs indicates a set of PAPR-preserving precoding matrices.
  • the PAPR of each UE antenna port of the set of UE antenna ports may be based on a single layer of the PUSCH transmission.
  • the precoding matrix may be configured to map each UE antenna port of the set of UE antenna ports to at most one layer of the PUSCH, irrespective of the number of UE antenna ports in the set of UE antenna ports.
  • the precoding matrix may be further configured to map multiple UE antenna ports of the set of UE antenna ports to the same layer of the PUSCH.
  • transmitting the PUSCH may include mapping each layer of the plurality of layers of the PUSCH to a unique UE antenna port of the set of UE antenna ports based on the determined precoding matrix, and transmitting the of the PUSCH via the set of UE antenna ports based on the mapping. In some instances, transmitting the PUSCH may also include mapping at least one UE antenna port of the set of UE antenna ports to multiple layers of the PUSCH.
  • the first indicator may be a codebook subset restriction indicator, and may be provided to the UE via radio resource control (RRC) signaling.
  • the second indicator may be based on at least one of the number of UE antenna ports in the set of UE antenna ports or a transmission rank of the PUSCH. The second indicator may be provided to the UE in a downlink control information (DCI) message. In some instances, the DCI message may schedule the PUSCH. In some other instances, the DCI message indicates the transmission rank of the PUSCH.
  • DCI downlink control information
  • the UE may include at least one modem, one or more processors communicatively coupled with the at least one modem, and at least one memory communicatively coupled with the one or more processors and the at least one modem.
  • the at least one memory may store instructions that, when executed by the one or more processors, cause the UE to perform a number of operations.
  • the number of operations may include indicating a UE capability of supporting transmission precoding matrices configured to preserve a peak-to-average power ratio (PAPR) of each UE antenna port used for uplink (UL) transmissions, receiving a first indicator identifying a subset of transmit precoding matrix identifiers (TPMIs) of a set of TPMIs based at least in part on the indicated UE capability, receiving a second indicator identifying a TPMI of the subset of TPMIs, determining a precoding matrix based at least in part on the identified TPMI, and transmitting a physical uplink shared channel (PUSCH) using a set of UE antenna ports according to the determined precoding matrix.
  • the subset of TPMIs indicates a set of PAPR-preserving precoding matrices.
  • the PAPR of each UE antenna port of the set of UE antenna ports may be based on a single layer of the PUSCH transmission.
  • the precoding matrix may be configured to map each UE antenna port of the set of UE antenna ports to at most one layer of the PUSCH, irrespective of the number of UE antenna ports in the set of UE antenna ports.
  • the precoding matrix may be further configured to map multiple UE antenna ports of the set of UE antenna ports to the same layer of the PUSCH.
  • transmitting the PUSCH may include mapping each layer of the plurality of layers of the PUSCH to a unique UE antenna port of the set of UE antenna ports based on the determined precoding matrix, and transmitting the PUSCH via the set of UE antenna ports based on the mapping. In some instances, transmitting the PUSCH may also include mapping at least one UE antenna port of the set of UE antenna ports to multiple layers of the PUSCH.
  • the first indicator may be a codebook subset restriction indicator, and may be provided to the UE via radio resource control (RRC) signaling.
  • the second indicator may be based on at least one of the number of UE antenna ports in the set of UE antenna ports or a transmission rank of the PUSCH. The second indicator may be provided to the UE in a downlink control information (DCI) message. In some instances, the DCI message may schedule the PUSCH. In some other instances, the DCI message indicates the transmission rank of the PUSCH.
  • DCI downlink control information
  • the method may be performed by a base station, and may include receiving, from a user equipment (UE) , an indication of a UE capability of supporting transmission precoding matrices configured to preserve a peak-to-average power ratio (PAPR) of each UE antenna port used for uplink (UL) transmissions, identifying a subset of transmit precoding matrix identifiers (TPMIs) of a set of TPMIs based at least in part on the indicated UE capability, transmitting a first indicator identifying the subset of TPMIs corresponding to the set of PAPR-preserving precoding matrices, selecting a TPMI of the subset of TPMIs based at least in part on a number of UE antenna ports in a set of UE antenna ports configured for transmitting a PUSCH, transmitting a second indicator identifying the selected TPMI, and receiving the PUSCH transmitted from the set of UE antenna ports according to the indicated pre
  • the PAPR of each UE antenna port of the set of UE antenna ports may be based on a single layer of the PUSCH transmission.
  • the precoding matrix may be configured to map each UE antenna port of the set of UE antenna ports to at most one layer of the PUSCH, irrespective of the number of UE antenna ports in the set of UE antenna ports.
  • the precoding matrix may be further configured to map multiple UE antenna ports of the set of UE antenna ports to the same layer of the PUSCH.
  • the first indicator may be a codebook subset restriction indicator, and may be provided to the UE via radio resource control (RRC) signaling.
  • the second indicator may be based on at least one of the number of UE antenna ports in the set of UE antenna ports or a transmission rank of the PUSCH.
  • the second indicator may be provided to the UE in a downlink control information (DCI) message.
  • DCI downlink control information
  • the DCI message may schedule the PUSCH.
  • the DCI message indicates the transmission rank of the PUSCH.
  • the base station may include at least one modem, one or more processors communicatively coupled with the at least one modem, and at least one memory communicatively coupled with the one or more processors.
  • the memory may store instructions that, when executed by the one or more processors, cause the base station to perform a number of operations.
  • the number of operations may include receiving, from a user equipment (UE) , an indication of a UE capability of supporting transmission precoding matrices configured to preserve a peak-to-average power ratio (PAPR) of each UE antenna port used for uplink (UL) transmissions, identifying a subset of transmit precoding matrix identifiers (TPMIs) of a set of TPMIs based at least in part on the indicated UE capability, transmitting a first indicator identifying the subset of TPMIs corresponding to the set of PAPR-preserving precoding matrices, selecting a TPMI of the subset of TPMIs based at least in part on a number of UE antenna ports in a set of UE antenna ports configured for transmitting a PUSCH, transmitting a second indicator identifying the selected TPMI, and receiving the PUSCH transmitted from the set of UE antenna ports according to the indicated precoding matrix.
  • the subset of TPMIs may indicate a set of PAPR-preserving precoding matrices
  • the PAPR of each UE antenna port of the set of UE antenna ports may be based on a single layer of the PUSCH transmission.
  • the precoding matrix may be configured to map each UE antenna port of the set of UE antenna ports to at most one layer of the PUSCH, irrespective of the number of UE antenna ports in the set of UE antenna ports.
  • the precoding matrix may be further configured to map multiple UE antenna ports of the set of UE antenna ports to the same layer of the PUSCH.
  • the first indicator may be a codebook subset restriction indicator, and may be provided to the UE via radio resource control (RRC) signaling.
  • the second indicator may be based on at least one of the number of UE antenna ports in the set of UE antenna ports or a transmission rank of the PUSCH.
  • the second indicator may be provided to the UE in a downlink control information (DCI) message.
  • DCI downlink control information
  • the DCI message may schedule the PUSCH.
  • the DCI message indicates the transmission rank of the PUSCH.
  • Figure 1 shows a diagram illustrating an example wireless communications system and access network.
  • Figures 2A, 2B, 2C, and 2D show diagrams illustrating examples of a first 5G/NR frame, DL channels within a 5G/NR subframe, a second 5G/NR frame, and UL channels within a 5G/NR subframe, respectively.
  • Figure 3 shows a diagram illustrating an example base station and user equipment (UE) in an access network.
  • UE user equipment
  • Figure 4 shows a sequence diagram depicting an example message exchange between a base station and UE in an access network.
  • Figure 5 shows a flowchart depicting an example operation for wireless communication by a UE.
  • Figures 6A and 6B show flowcharts depicting example operations for wireless communication by a UE.
  • Figure 7 shows a flowchart depicting an example operation for wireless communication by a base station.
  • Figure 8 shows example precoding matrices useable for wireless communication.
  • Figure 9 shows a conceptual data flow diagram illustrating the data flow between different means/components in an example apparatus.
  • Figure 10 shows a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system.
  • Figure 11 shows a conceptual data flow diagram illustrating the data flow between different means/components in another example apparatus.
  • Figure 12 shows a diagram illustrating an example of a hardware implementation for another apparatus employing a processing system.
  • the following description is directed to some particular implementations for the purposes of describing innovative aspects of this disclosure.
  • RF radio frequency
  • 3GPP 3rd Generation Partnership Project
  • IEEE Institute of Electrical and Electronics Engineers
  • IEEE 802.11 standards
  • IEEE 802.15 standards
  • SIG Bluetooth Special Interest Group
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal FDMA
  • SC-FDMA single-carrier FDMA
  • SU single-user
  • MIMO multiple-input multiple-output
  • MU multi-user MIMO
  • the described implementations also can be implemented using other wireless communication protocols or RF signals suitable for use in one or more of a wireless wide area network (WWAN) , a wireless personal area network (WPAN) , a wireless local area network (WLAN) , or an internet of things (IOT) network.
  • WWAN wireless wide area network
  • WPAN wireless personal area network
  • WLAN wireless local area network
  • IOT internet of things
  • PAPR peak-to-average power ratio
  • the PAPR of a UE antenna port is based on the combined power levels of streams mapped to the UE antenna port for UL transmission.
  • the power level of a stream is based on the output power level of a power amplifier (PA) associated with transmitting the stream.
  • PA power amplifier
  • the PAPR limit for each UE antenna port of a set of UE antenna ports is independent of the PAPR limits for the other UE antenna ports of the set of UE antenna ports. That is, the PAPR limit for one UE antenna port may not be increased for UL transmissions by “borrowing” unused power headroom from other UE antenna ports that are inactive during the UL transmissions.
  • the PAPR of the UE antenna port is based on the combined power level of the plurality of layers. Specifically, when a UE antenna port is mapped to a single channel layer associated with a respective Tx chain, the PAPR of the UE antenna port is based on the output power level of the PA provided within the respective Tx chain. When a UE antenna port is mapped to channel layers associated with two respective Tx chains, the PAPR of the UE antenna port is based on the combined power levels of the PAs associated with the two respective Tx chains. As a result, the UE may need to reduce the output power of the PAs associated with the different channel layers in order to comply with applicable PAPR limits.
  • Reducing the power level with which multiple layers are transmitted from the same UE antenna port in order to comply with applicable PAPR limits may pose a number of disadvantages including, for example, reducing the signal-to-noise ratio (SNR) of UL transmissions and decreasing the range of UL transmissions.
  • SNR signal-to-noise ratio
  • reducing the SNR of UL transmissions may lead to increased packet loss (and thus greater packet error rates (PERs) )
  • PERs packet error rates
  • Implementations of the subject matter described in this disclosure may be used to maintain or preserve the PAPR of UE antenna ports during UL transmissions, for example, to avoid decreasing the range and/or the SNR of UL transmissions due to PAPR limits.
  • a UE may determine a precoding matrix configured to preserve the PAPR of each UE antenna port used for UL transmissions, and then pre-code the layers of a signal or channel using the determined precoding matrix.
  • the determined precoding matrix may be configured to map each UE antenna port of a set of UE antenna ports to at most one layer of an UL channel (such as the PUSCH) , irrespective of the number of UE antenna ports configured for transmitting the UL channel.
  • the determined precoding matrix may ensure that each UE antenna port transmits at most one layer of the UL channel at a time, for example, such that the PAPR of each UE antenna port is based on the output power of only one Tx chain or PA at any given time. In this way, the UE may not need to reduce the transmit power of individual layers of the UL channel to comply with applicable PAPR limits.
  • the determined precoding matrix may also be configured to map multiple UE antenna ports to the same layer of the UL channel, for example, so that at least one layer can be transmitted from multiple UE antenna ports at the same time.
  • aspects of the present disclosure may allow for spatial processing, beamforming, and UL MIMO transmissions while preserving the PAPR of each UE antenna port.
  • a precoding matrix configured to preserve the PAPR of an UE antenna in accordance with various aspects of the present disclosure may be referred to as a “PAPR-preserving precoding matrix. ”
  • processors include microprocessors, microcontrollers, graphics processing units (GPUs) , central processing units (CPUs) , application processors, digital signal processors (DSPs) , reduced instruction set computing (RISC) processors, systems on a chip (SoC) , baseband processors, field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • processors in the processing system may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer.
  • such computer-readable media can include a random-access memory (RAM) , a read-only memory (ROM) , an electrically erasable programmable ROM (EEPROM) , optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • RAM random-access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable ROM
  • optical disk storage magnetic disk storage
  • magnetic disk storage other magnetic storage devices
  • combinations of the aforementioned types of computer-readable media or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • FIG. 1 shows a diagram of an example wireless communications system and an access network 100.
  • the wireless communications system (also referred to as a wireless wide area network (WWAN) ) includes base stations 102, UEs 104, an Evolved Packet Core (EPC) 160, and another core network 190 (such as a 5G Core (5GC) ) .
  • the base stations 102 may include macrocells (high power cellular base station) or small cells (low power cellular base station) .
  • the macrocells include base stations.
  • the small cells include femtocells, picocells, and microcells.
  • the base stations 102 configured for 4G LTE may interface with the EPC 160 through backhaul links 132 (such as the S1 interface) .
  • the base stations 102 configured for 5G NR may interface with core network 190 through backhaul links 184.
  • the base stations 102 may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (such as handover, dual connectivity) , inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS) , subscriber and equipment trace, RAN information management (RIM) , paging, positioning, and delivery of warning messages.
  • the base stations 102 may communicate directly or indirectly (such as through the EPC 160 or core network 190) with each other over backhaul links 134 (such as the X2 interface) .
  • the backhaul links 134 may be wired or wireless.
  • the base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102’ may have a coverage area 110’ that overlaps the coverage area 110 of one or more macro base stations 102.
  • a network that includes both small cell and macrocells may be known as a heterogeneous network.
  • a heterogeneous network also may include Home Evolved Node Bs (eNBs) (HeNBs) , which may provide service to a restricted group known as a closed subscriber group (CSG) .
  • eNBs Home Evolved Node Bs
  • HeNBs Home Evolved Node Bs
  • CSG closed subscriber group
  • the communication links 120 between the base stations 102 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104.
  • the communication links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, or transmit diversity.
  • the communication links may be through one or more carriers.
  • the base stations 102 /UEs 104 may use spectrum up to Y MHz (such as 5 MHz, 10 MHz, 15 MHz, 20 MHz, 100 MHz, 400 MHz, etc.
  • the component carriers may include a primary component carrier and one or more secondary component carriers.
  • a primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell) .
  • D2D communication link 158 may use the DL/UL WWAN spectrum.
  • the D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • sidelink channels such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • sidelink channels such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • D2D communication may be through a variety of wireless D2D communications systems, such as for example, FlashLinQ, WiMedia,
  • the wireless communications system may further include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154 in a 5 GHz unlicensed frequency spectrum.
  • AP Wi-Fi access point
  • STAs Wi-Fi stations
  • communication links 154 in a 5 GHz unlicensed frequency spectrum.
  • the STAs 152 /AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.
  • CCA clear channel assessment
  • the small cell 102’ may operate in a licensed or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102’ may employ NR and use the same 5 GHz unlicensed frequency spectrum as used by the Wi-Fi AP 150. The small cell 102’, employing NR in an unlicensed frequency spectrum, may boost coverage to or increase capacity of the access network.
  • a base station 102 may include an eNB, gNodeB (gNB) , or another type of base station.
  • Some base stations, such as gNB 180 may operate in a traditional sub 6 GHz spectrum, in millimeter wave (mmW) frequencies, or near mmW frequencies in communication with the UE 104.
  • mmW millimeter wave
  • mmW base station Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum.
  • EHF Extremely high frequency
  • EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in the band may be referred to as a millimeter wave. Near mmW may extend down to a frequency of 3 GHz with a wavelength of 100 millimeters.
  • the super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave. Communications using the mmW /near mmW radio frequency band (such as between 3 GHz –300 GHz) has extremely high path loss and a short range.
  • the mmW base station 180 may utilize beamforming 182 with the UE 104 to compensate for the extremely high path loss and short range.
  • the base station 180 may transmit a beamformed signal to the UE 104 in one or more transmit directions 182’.
  • the UE 104 may receive the beamformed signal from the base station 180 in one or more receive directions 182”.
  • the UE 104 also may transmit a beamformed signal to the base station 180 in one or more transmit directions.
  • the base station 180 may receive the beamformed signal from the UE 104 in one or more receive directions.
  • the base station 180 and UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 180 and UE 104.
  • the transmit and receive directions for the base station 180 may or may not be the same.
  • the transmit and receive directions for the UE 104 may or may not be the same.
  • the EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172.
  • MME Mobility Management Entity
  • MBMS Multimedia Broadcast Multicast Service
  • BM-SC Broadcast Multicast Service Center
  • PDN Packet Data Network
  • the MME 162 may be in communication with a Home Subscriber Server (HSS) 174.
  • HSS Home Subscriber Server
  • the MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160.
  • the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the Serving Gateway 166, which itself is connected to the PDN Gateway 172.
  • IP Internet protocol
  • the PDN Gateway 172 provides UE IP address allocation as well as other functions.
  • the PDN Gateway 172 and the BM-SC 170 are connected to the IP Services 176.
  • the IP Services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service, or other IP services.
  • the BM-SC 170 may provide functions for MBMS user service provisioning and delivery.
  • the BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN) , and may be used to schedule MBMS transmissions.
  • PLMN public land mobile network
  • the MBMS Gateway 168 may be used to distribute MBMS traffic to the base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting MBMS related charging information.
  • MMSFN Multicast Broadcast Single Frequency Network
  • the core network 190 may include an Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195.
  • the AMF 192 may be in communication with a Unified Data Management (UDM) 196.
  • the AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190.
  • the AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF 195.
  • the UPF 195 provides UE IP address allocation as well as other functions.
  • the UPF 195 is connected to the IP Services 197.
  • the IP Services 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service, or other IP services.
  • IMS IP Multimedia Subsystem
  • the base station also may be referred to as a gNB, Node B, evolved Node B (eNB) , an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , a transmit reception point (TRP) , or some other suitable terminology.
  • the base station 102 provides an access point to the EPC 160 or core network 190 for a UE 104.
  • Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA) , a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (such as an MP3 player) , a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • the UEs 104 may be referred to as IoT devices (such as a parking meter, gas pump, toaster, vehicles, heart monitor, etc. ) .
  • the UE 104 also may be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
  • the base station 102/180 may determine a set of transmission precoding matrices configured to preserve a peak-to-average power ratio (PAPR) of each UE antenna port used for uplink (UL) transmissions, and may select a PAPR-preserving precoding matrix for a particular UE 104 based at least in part on the particular UE’s capability for supporting PAPR- preserving precoding matrices.
  • the base station 102/180 may indicate the selected PAPR-preserving precoding matrix to the UE 104 in a DCI message, and the UE 104 may use the selected PAPR-preserving precoding matrix for transmitting the PUSCH (or other suitable UL transmissions) .
  • the PAPR-preserving precoding matrix may be configured to map each UE antenna port of a set of UE antenna ports used for PUSCH transmissions to at most one layer of the PUSCH, irrespective of the number of UE antenna ports in the set of UE antenna ports allocated for transmitting the PUSCH.
  • the PAPR-preserving precoding matrix may also be configured to map multiple UE antenna ports to the same layer of the PUSCH.
  • Figure 2A shows an example of a first slot 200 within a 5G/NR frame structure.
  • Figure 2B shows an example of DL channels 230 within a 5G/NR slot.
  • Figure 2C shows an example of a second slot 250 within a 5G/NR frame structure.
  • Figure 2D shows an example of UL channels 280 within a 5G/NR slot.
  • the 5G/NR frame structure may be FDD in which, for a particular set of subcarriers (carrier system bandwidth) , slots within the set of subcarriers are dedicated for either DL or UL transmissions.
  • the 5G/NR frame structure may be TDD in which, for a particular set of subcarriers (carrier system bandwidth) , slots within the set of subcarriers are dedicated for both DL and UL transmissions.
  • the 5G/NR frame structure is based on TDD, with slot 4 configured with slot format 28 (with mostly DL) , where D indicates DL, U indicates UL, and X indicates that the slot is flexible for use between DL and UL, and with slot 3 configured with slot format 34 (with mostly UL) . While slots 3 and 4 are shown with slot formats 34 and 28, respectively, any particular slot may be configured with any of the various available slot formats 0–61.
  • Slot formats 0 and 1 are all DL and all UL, respectively.
  • Other slot formats 2–61 include a mix of DL, UL, and flexible symbols.
  • UEs may be configured with the slot format, either dynamically through downlink control information (DCI) or semi-statically through radio resource control (RRC) signaling by a slot format indicator (SFI) .
  • DCI downlink control information
  • RRC radio resource control
  • SFI slot format indicator
  • the configured slot format also may apply to a 5G/NR frame structure that is based on FDD.
  • a frame may be divided into a number of equally sized subframes. For example, a frame having a duration of 10 microseconds ( ⁇ s) may be divided into 10 equally sized subframes each having a duration of 1 ⁇ s.
  • Each subframe may include one or more time slots.
  • Subframes also may include mini-slots, which may include 7, 4, or 2 symbols.
  • Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols.
  • the symbols on DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols.
  • the symbols on UL may be CP-OFDM symbols (such as for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as single carrier frequency-division multiple access (SC-FDMA) symbols) (such as for power limited scenarios) .
  • DFT discrete Fourier transform
  • SC-FDMA single carrier frequency-division multiple access
  • the number of slots within a subframe is based on the slot configuration and the numerology.
  • different numerologies ( ⁇ ) 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots, respectively, per subframe.
  • different numerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe.
  • the subcarrier spacing and symbol length/duration are a function of the numerology.
  • the subcarrier spacing may be equal to 2 ⁇ *15 kHz, where ⁇ is the numerology 0 to 5.
  • the symbol length/duration is inversely related to the subcarrier spacing.
  • the subcarrier spacing is 15 kHz and symbol duration is approximately 66.7 microseconds ( ⁇ s) .
  • a resource grid may be used to represent the frame structure.
  • Each time slot includes a resource block (RB) (also referred to as a physical RB (PRB) ) that extends across 12 consecutive subcarriers and across a number of symbols. The intersections of subcarriers and across 14 symbols. The intersections of subcarriers and of the RB define multiple resource elements (REs) . The number of bits carried by each RE depends on the modulation scheme.
  • RB resource block
  • PRB physical RB
  • some of the REs carry a reference signal (RS) for the UE.
  • one or more REs may carry a demodulation reference signal (DM-RS) (indicated as Rx for one particular configuration, where 100x is the port number, but other DM-RS configurations are possible) .
  • DM-RS demodulation reference signal
  • one or more REs may carry a channel state information reference signal (CSI-RS) for channel measurement at the UE.
  • the REs also may include a beam measurement reference signal (BRS) , a beam refinement reference signal (BRRS) , and a phase tracking reference signal (PT-RS) .
  • BRS beam measurement reference signal
  • BRRS beam refinement reference signal
  • PT-RS phase tracking reference signal
  • FIG. 2B illustrates an example of various DL channels within a subframe of a frame.
  • the physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) , each CCE including nine RE groups (REGs) , each REG including four consecutive REs in an OFDM symbol.
  • a primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE 104 to determine subframe or symbol timing and a physical layer identity.
  • a secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing.
  • the UE can determine a physical cell identifier (PCI) . Based on the PCI, the UE can determine the locations of the aforementioned DM-RS.
  • the physical broadcast channel (PBCH) which carries a master information block (MIB) , may be logically grouped with the PSS and SSS to form a synchronization signal (SS) /PBCH block.
  • the MIB provides a number of RBs in the system bandwidth and a system frame number (SFN) .
  • the physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs) , and paging messages.
  • SIBs system information blocks
  • some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station.
  • the UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH) .
  • the PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH.
  • the PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used.
  • the UE may transmit sounding reference signals (SRS) .
  • the SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.
  • FIG. 2D illustrates an example of various UL channels within a subframe of a frame.
  • the PUCCH may be located as indicated in one configuration.
  • the PUCCH carries uplink control information (UCI) , such as scheduling requests, a channel quality indicator (CQI) , a precoding matrix indicator (PMI) , a rank indicator (RI) , and HARQ ACK/NACK feedback.
  • UCI uplink control information
  • the PUSCH carries data, and may additionally be used to carry a buffer status report (BSR) , a power headroom report (PHR) , or UCI.
  • BSR buffer status report
  • PHR power headroom report
  • FIG. 3 shows a block diagram of an example base station 310 and UE 350 in an access network.
  • IP packets from the EPC 160 may be provided to a controller/processor 375.
  • the controller/processor 375 implements layer 3 and layer 2 functionality.
  • Layer 3 includes a radio resource control (RRC) layer
  • layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer.
  • RRC radio resource control
  • SDAP service data adaptation protocol
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC medium access control
  • the controller/processor 375 provides RRC layer functionality associated with broadcasting of system information (such as the MIB and SIBs) , RRC connection control (such as RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release) , inter radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression /decompression, security (ciphering, deciphering, integrity protection, integrity verification) , and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs) , error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs) , re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs) , demultiplexing of MAC SDUs from TBs
  • the transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions.
  • Layer 1 which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing.
  • the TX processor 316 handles mapping to signal constellations based on various modulation schemes (such as binary phase-shift keying (BPSK) , quadrature phase-shift keying (QPSK) , M-phase-shift keying (M-PSK) , M-quadrature amplitude modulation (M-QAM) ) .
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • the coded and modulated symbols may then be split into parallel streams.
  • Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (such as a pilot signal) in the time or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream.
  • IFFT Inverse Fast Fourier Transform
  • the OFDM stream is spatially pre-coded to produce multiple spatial streams.
  • Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing.
  • the channel estimate may be derived from a reference signal or channel condition feedback transmitted by the UE 350.
  • Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX.
  • Each transmitter 318TX may modulate an RF carrier with a respective spatial stream for transmission.
  • each receiver 354RX receives a signal through its respective antenna 352.
  • Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356.
  • the TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions.
  • the RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream.
  • the RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT) .
  • FFT Fast Fourier Transform
  • the frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal.
  • the symbols on each subcarrier, and the reference signal are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions may be based on channel estimates computed by the channel estimator 358.
  • the soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel.
  • the data and control signals are then provided to the controller/processor 359, which implements layer 3 and layer 2 functionality.
  • the controller/processor 359 can be associated with a memory 360 that stores program codes and data.
  • the memory 360 may be referred to as a computer- readable medium.
  • the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC 160.
  • the controller/processor 359 is also responsible for error detection using an ACK or NACK protocol to support HARQ operations.
  • the controller/processor 359 provides RRC layer functionality associated with system information (such as the MIB and SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression /decompression, and security (ciphering, deciphering, integrity protection, integrity verification) ; RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.
  • RRC layer functionality associated with system information (such as the MIB and SIBs) acquisition, RRC connections, and measurement reporting
  • PDCP layer functionality associated with header compression /
  • Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing.
  • the spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.
  • the UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350.
  • Each receiver 318RX receives a signal through its respective antenna 320.
  • Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.
  • the controller/processor 375 can be associated with a memory 376 that stores program codes and data.
  • the memory 376 may be referred to as a computer-readable medium.
  • the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 350. IP packets from the controller/processor 375 may be provided to the EPC 160.
  • the controller/processor 375 is also responsible for error detection using an ACK or NACK protocol to support HARQ operations.
  • Information to be wirelessly communicated (such as for LTE or NR based communications) is encoded and mapped, at the PHY layer, to one or more wireless channels for transmission.
  • each antenna 352 of the UE 350 is coupled to a respective transmitter 354TX.
  • each transmitter may be coupled to a respective power amplifier (PA) which amplifies the signal to be transmitted.
  • PA power amplifier
  • the combination of a transmitter with a PA may be referred to herein as a “transmit chain” or “TX chain. ”
  • TX chain To save on cost or die area, the same PA may be reused to transmit signals over multiple RX antennas.
  • one or more TX chains of a UE may be switchably coupled to multiple RX antennas ports.
  • Figure 4 shows a sequence diagram depicting an example message exchange 400 between a base station 402 and a UE 404 in an access network.
  • the base station 402 may be one example of the base station 102 of Figure 1 or the base station 310 of Figure 3
  • the UE 404 may be one example of the UE 104 of Figure 1 or the UE 350 of Figure 3
  • the access network may be a 5G NR access network.
  • the base station 402 may be any suitable base station or node including, for example, a gNB or an eNB.
  • the UE 404 indicates, to the base station 402, a UE capability of supporting transmission precoding matrices configured to preserve a peak-to-average power ratio (PAPR) of each UE antenna port used for uplink (UL) transmissions.
  • the UE 404 may transmit a “PAPR-only” capability indicating that the UE 404 seeks only precoding matrices that are configured to preserve the PAPR of each UE antenna port during UL transmissions.
  • the base station 402 receives the UE capability, and determines that the UE 404 is capable of using PAPR-preserving precoding matrices for pre-coding information prior to its transmission to one or more other devices.
  • the base station 402 configures a set of UE antenna ports and determines or selects a maximum transmission rank for a physical uplink shared channel (PUSCH) transmission from the UE 404.
  • the transmission rank indicates the number of layers or spatial streams in an uplink (UL) MIMO transmission.
  • the base station 402 may also select a precoding matrix for the PUSCH transmission based on one or more of the indicated UE capability, the configurated set of UE antenna ports, or the maximum transmission rank.
  • the selected precoding matrix is configured to map each UE antenna port to at most one layer or spatial stream of the PUSCH, irrespective of the number of UE antenna ports configured to transmit the PUSCH.
  • the base station 402 identifies a subset of transmit precoding matrix identifiers (TPMIs) of a set of TPMIs based at least in part on the indicated UE capability.
  • the subset of TPMIs may indicate a set of PAPR-preserving precoding matrices that can be used by the UE to preserve the PAPR of its UE antenna ports during UL transmissions.
  • the base station 402 transmits a first indicator to the UE 404.
  • the first indicator may identify the subset of TPMIs corresponding to the set of PAPR-preserving precoding matrices.
  • the first indicator is provided to the UE 404 via RRC signaling.
  • the first indicator may be provided to the UE 404 using another suitable signaling or configuration, such as media access control-control element (MAC-CE) signaling.
  • MAC-CE media access control-control element
  • the first indicator may carry any indication of the maximum transmission rank, the set of configured UE antenna ports, and the selected precoding matrix to the UE 404.
  • the UE 404 receives the first indicator, and uses the first indicator to identify the subset of TPMIs corresponding to the PAPR-preserving precoding matrices. In some instances, the UE 404 may also determine the maximum transmission rank based on the first indicator.
  • the first indicator is a codebook subset restriction (CSR) indicator that identifies a particular group or subset of the codebook.
  • CSR codebook subset restriction
  • the base station 402 transmits a second indicator to the UE 404.
  • the second indicator which may be based on at least one of the number of UE antenna ports configured to transmit the PUSCH or a transmission rank of the PUSCH, identifies a TPMI of the subset of TPMIs.
  • the second indicator may be provided to the UE 404 in a downlink control information (DCI) message.
  • DCI downlink control information
  • the DCI message schedules the PUSCH.
  • the DCI message indicates a transmission rank of the PUSCH, which is not greater than the maximum rank configured by the first indicator.
  • the UE 404 receives the second indicator, and uses the second indicator to locate or identify the TPMI of the subset of TPMIs. Specifically, the UE determines the precoding matrix based at least in part on the identified TPMI. In some implementations, the determined precoding matrix is configured to map each UE antenna port to at most one layer of the PUSCH, irrespective of the number of UE antenna ports configured for transmitting the PUSCH. In some instances, the determined precoding matrix may also be configured to map multiple UE antenna ports of the set of UE antenna ports to the same layer of the PUSCH.
  • the UE 404 transmits the PUSCH using the set of UE antenna ports according to the determined precoding matrix. Specifically, the UE 404 uses the determined precoding matrix to pre-code the PUSCH such that each layer of the PUSCH is mapped to one or more UE antenna ports, and each UE antenna port is mapped to at most one layer of the PUSCH.
  • the PUSCH transmission may be a codebook-based transmission using a single-carrier frequency-division multiple access (SC-FDMA) or DFT-s-OFDM signaling scheme.
  • the PUSCH transmission may be a beamformed UL MIMO transmission, for example, by mapping a single PUSCH layer to multiple UE antenna ports at the same time.
  • the base station 402 receives the PUSCH transmitted from the set of UE antenna ports according to the indicated precoding matrix.
  • Figure 5 shows a flowchart depicting an example method 500 of wireless communication.
  • the method 500 may be performed by a UE such as the UE 104 of Figure 1, the UE 404 of Figure 4, or the apparatus 902/902’ of Figure 9.
  • the method 500 may be performed by any suitable UE.
  • the base station 402 may be one example of the base station 102 of Figure 1 or the base station 310 of Figure 3.
  • the base station 402 may be any suitable base station or node including, for example, a gNB or an eNB.
  • the UE indicates a UE capability of supporting transmission precoding matrices configured to preserve a peak-to-average power ratio (PAPR) of each UE antenna port used for uplink (UL) transmissions.
  • PAPR-preserving transmission precoding matrices may be configured to map each UE antenna port of a set of UE antenna ports to at most one layer of the PUSCH, irrespective of the number of UE antenna ports configured for transmitting the PUSCH.
  • the PAPR-preserving transmission precoding matrices may also be configured to map multiple UE antenna ports of the set of UE antenna ports to the same layer of the PUSCH.
  • the UE receives a first indicator identifying a subset of transmit precoding matrix identifiers (TPMIs) of a set of TPMIs based at least in part on the indicated UE capability.
  • TPMIs transmit precoding matrix identifiers
  • the subset of TPMIs indicates a set of PAPR-preserving precoding matrices.
  • the UE may be provided a collection of precoding matrices that includes a set of PAPR-preserving precoding matrices and a set of non-PAPR-preserving precoding matrices.
  • the set of non-PAPR-preserving precoding matrices may include one or more precoding matrices that map the same UE antenna port to more than one layer of an UL transmission (such as a PUSCH transmission) .
  • the PAPR of the antenna port is based on a combination of the transmit power levels of the multiple layers, which may cause the PAPR of the antenna port to exceed applicable PAPR limits.
  • the UE may attempt to comply with the PAPR limits by reducing the transmit power levels of the multiple layers, reducing the transmit power of a layer may reduce the SNR of the transmitted signal or channel, which may increase packet loss and reduce signal integrity. Reducing the transmit power of a layer may also decrease the range of UL transmissions from the UE, which may shrink the effective coverage area provided for the UE by the serving cell.
  • the set of PAPR-preserving precoding matrices disclosed herein may consist of precoding matrices that map each UE antenna port to at most one layer of an UL signal or channel, thereby allowing one spatial stream to be transmitted from any single given UE antenna port at the same time.
  • the PAPR of any given UE antenna port during UL transmissions is based on the output power level of only one PA/Tx chain of the UE, rather than on the combined output power levels of multiple PAs/Tx chains.
  • the PAPR-preserving precoding matrices disclosed herein prevent output power summing at the UE antenna ports when determining PAPR values of the UE antenna ports, which may avoid the need to reduce the transmit power levels of one or more layers of the PUSCH in order to comply with applicable PAPR limits.
  • the UE receives a second indicator identifying a TPMI of the subset of TPMIs.
  • the first indicator may be provided to the UE via RRC signaling, and the second indicator may be provided to the UE in a downlink control information (DCI) message.
  • the first indicator may be a codebook subset restriction (CSR) indicator that indicates a codebook subset type PAPR-only, and the codebook subset type PAPR-only may be associated with a subset of TPMIs.
  • the second indicator may locate or identify a specific codebook, or a specific PAPR-preserving precoding matrix, with which the UE is to pre-code information for UL transmission.
  • the second indicator, and thus the specific PAPR-preserving precoding matrix may be based on at least one of the number of UE antenna ports used for transmitting the PUSCH or a transmission rank of the PUSCH.
  • the UE determines a precoding matrix based at least in part on the identified TPMI.
  • the determined precoding matrix may be configured to map each UE antenna port to at most one layer of the PUSCH, irrespective of the number of UE antenna ports used for transmitting the PUSCH. That is, the determined precoding matrix may allow one spatial stream to be transmitted from any single given UE antenna port at the same time. In some instances, the determined precoding matrix may also map each layer of the PUSCH to a unique UE antenna port. Additionally, the determined precoding matrix can map at least one UE antenna port to multiple layers of the PUSCH.
  • the UE transmits the PUSCH using the set of UE antenna ports according to the determined precoding matrix.
  • the PAPR-preserving precoding matrices disclosed herein may allow for UL transmissions (such as PUSCH transmissions) without output power summing at any of the UE’s antenna ports, thereby preserving the PAPR of the UE antenna ports.
  • the determined precoding matrix may allow the UE to beamform UL MIMO transmissions while still preserving the PAPR of the UE antenna ports.
  • a v-layer signal can be expressed as a block of vectors and the transmitted signals after precoding on the UE antenna ports are where W is the precoding matrix applied to the block of vectors to generate one or more spatial streams:
  • Figure 6A shows a flowchart depicting an example method 600 of wireless communication.
  • the method 600 may be performed by a UE such as the UE 104 of Figure 1, the UE 404 of Figure 4, or the apparatus 902/902’ of Figure 9. Although described with respect to the UE 404 of Figure 4, the method 600 may be performed by any suitable UE.
  • the method 600 may be one example of transmitting the PUSCH in block 510 of Figure 5.
  • the UE maps each layer of the PUSCH to a unique UE antenna port based on the determined precoding matrix.
  • the UE transmits the PUSCH from the selected number of UE antenna ports based on the mapping.
  • Figure 6B shows a flowchart depicting an example method 610 of wireless communication.
  • the method 610 may be performed by a UE such as the UE 104 of Figure 1, the UE 404 of Figure 4, or the apparatus 902/902’ of Figure 9. Although described with respect to the UE 404 of Figure 4, the method 610 may be performed by any suitable UE. In some implementations, the method 610 may be one example of determining the precoding matrix in block 508 of Figure 5.
  • the UE maps at least one UE antenna port to multiple layers of the PUSCH.
  • the base station may indicate a transmission rank equal to two (e.g., the PUSCH includes two layers) , and may indicate that the UE is to use four UE antenna ports for the PUSCH transmission.
  • the UE may use a PAPR-preserving precoding matrix that maps a first layer of the PUSCH to first and third antenna ports of the UE, and maps a second layer of the PUSCH to second and fourth antenna ports of the UE. As such, each of the two layers of the PUSCH can be mapped to (and transmitted from) a different pair of UE antenna ports.
  • the UE By transmitting the first layer of the PUSCH from a first set of two UE antenna ports, the UE can beamform the first layer of the PUSCH, and can also steer the first layer of the PUSCH (e.g., towards a serving cell) .
  • the UE By transmitting the second layer of the PUSCH from a second set of two UE antenna ports, the UE can beamform the second layer of the PUSCH, and can also steer the second layer of the PUSCH (e.g., towards the serving cell) .
  • An example PAPR-preserving precoding matrix may be expressed as:
  • y (0) represents the first layer
  • y (1) represents the second layer
  • y (2) represents the third layer
  • z (p0) (i) represents the spatial stream transmitted from UE antenna port
  • z (p1) represents the spatial stream transmitted from UE antenna port 1
  • z (p2) represents the spatial stream transmitted from UE antenna port 2
  • z (p3) i) represents the spatial stream transmitted from UE antenna port 3.
  • the base station may indicate a transmission rank equal to three (e.g., the PUSCH includes three layers) , and may indicate that the UE is to use four UE antenna ports for the PUSCH transmission.
  • the UE may use a precoding matrix that maps a first layer of the PUSCH to first and third antenna ports of the UE, maps a second layer of the PUSCH to a second antenna port of the UE, and maps a third layer of the PUSCH to a third antenna port of the UE.
  • the UE can beamform the first layer of the PUSCH, and can also steer the first layer of the PUSCH (e.g., towards the serving cell) .
  • Another example PAPR-preserving precoding matrix may be expressed as:
  • y (0) represents the first layer
  • y (1) represents the second layer
  • z (p0) (i) represents the spatial stream transmitted from UE antenna port 1
  • z (p2) (i) represents the spatial stream transmitted from UE antenna port 2
  • z (p3) (i) represents the spatial stream transmitted from UE antenna port 3.
  • FIG 7 shows a flowchart depicting an example method 700 of wireless communication.
  • the method 700 may be performed by a base station such as the base station 102 of Figure 1, the base station 402 of Figure 4, or the apparatus 1102/1102’ of Figure 11. Although described with respect to the base station 402 of Figure 4, the method 700 may be performed by any suitable base station.
  • the base station receives an indication of a UE capability of supporting transmission precoding matrices configured to preserve a peak-to-average power ratio (PAPR) of each UE antenna port used for uplink (UL) transmissions.
  • PAPR-preserving transmission precoding matrices may be configured to map each UE antenna port of a set of UE antenna ports to at most one layer of the PUSCH, irrespective of the number of UE antenna ports in the set of UE antenna ports.
  • the PAPR-preserving transmission precoding matrices may be also configured to map multiple UE antenna ports of the set of UE antenna ports to the same layer of the PUSCH.
  • the base station identifies a subset of TPMIs of a set of TPMIs based at least in part on the indicated UE capability.
  • the subset of TPMIs indicates a set of PAPR-preserving precoding matrices.
  • the UE may be provided a collection of precoding matrices that includes a set of PAPR-preserving precoding matrices and a set of non-PAPR-preserving precoding matrices.
  • the set of non-PAPR-preserving precoding matrices may include one or more precoding matrices that map the same UE antenna port to more than one layer of an UL transmission (such as a PUSCH transmission) .
  • the set of PAPR-preserving precoding matrices disclosed herein may consist of precoding matrices that map each UE antenna port to at most one layer of an UL signal or channel, thereby allowing one spatial stream to be transmitted from any single given UE antenna port at the same time.
  • the PAPR of any given UE antenna port during UL transmissions is based on the output power level of only one PA/Tx chain of the UE, rather than on the combined output power levels of multiple PAs/Tx chains.
  • the PAPR-preserving precoding matrices disclosed herein prevent output power summing at the UE antenna ports when determining PAPR values of the UE antenna ports, which may avoid the need to reduce the transmit power levels of one or more layers of the PUSCH in order to comply with applicable PAPR limits.
  • the base station transmits a first indicator to the UE.
  • the first indicator identifies the subset of TPMIs corresponding to the set of PAPR-preserving precoding matrices.
  • the first indicator may be provided to the UE via RRC signaling, and may be a codebook subset restriction (CRS) indicator that indicates a codebook subset type PAPR-only.
  • the codebook subset type PAPR-only may be associated with a subset of TPMIs.
  • the base station selects a TPMI of the subset of TPMIs based at least in part on a number of UE antenna ports configured for transmitting the PUSCH.
  • the selected TPMI indicates a precoding matrix configured to map each UE antenna port of the set of UE antenna ports to at most one layer of the PUSCH, irrespective of the number of UE antenna ports in the set of UE antenna ports.
  • the base station transmits a second indicator to the UE.
  • the second indicator identifies a TPMI of the subset of TPMIs.
  • the second indicator may identify a specific codebook, or a specific PAPR-preserving precoding matrix, with which the UE is to pre-code information for UL transmission.
  • the second indicator, and thus the specific PAPR-preserving precoding matrix may be based on at least one of the number of UE antenna ports used for transmitting the PUSCH or a transmission rank of the PUSCH.
  • the second indicator may be provided to the UE in a downlink control information (DCI) message.
  • the DCI message may schedule the PUSCH, and may indicate a transmission rank of the PUSCH.
  • DCI downlink control information
  • the base station receives the PUSCH transmitted from the set of UE antenna ports according to the indicated precoding matrix.
  • the PAPR-preserving precoding matrices disclosed herein may allow for UL transmissions (such as PUSCH transmissions) without output power summing at any of the UE’s antenna ports, thereby preserving the PAPR of the UE antenna ports.
  • the determined precoding matrix maps at least one UE antenna port to multiple layers of the PUSCH
  • the determined precoding matrix may allow the UE to beamform UL MIMO transmissions while still preserving the PAPR of the UE antenna ports.
  • Figure 8 shows example precoding matrices 800, 810, 820, and 830 useable for wireless communication.
  • the first precoding matrix 800 is configured for a two-layer PUSCH transmission using two antenna ports of a UE.
  • the first precoding matrix 800 maps the first PUSCH layer to a first UE antenna port, and maps the second PUSCH layer to a second UE antenna port.
  • the second precoding matrices 810 are configured for a two-layer PUSCH transmission using four antenna ports of a UE.
  • the third precoding matrices 820 are configured for a three-layer PUSCH transmission using four antenna ports of a UE.
  • the fourth precoding matrices 830 are configured for a four-layer PUSCH transmission using four antenna ports of a UE.
  • FIG. 9 is a conceptual data flow diagram 900 illustrating the data flow between different means/components in an example apparatus 902.
  • the apparatus may be a UE.
  • the apparatus includes a reception component 904 that receives indications of PAPR-preserving precoding matrices for UL transmissions (such as CSRIs and TPMIs) , a precoding matrix determination component 906 that determines a precoding matrix for PUSCH transmissions, a precoder component 908 that pre-codes UL data according to the determined precoding matrix, and a transmission component that transmits UE capabilities and the PUSCH, among other suitable transmissions.
  • indications of PAPR-preserving precoding matrices for UL transmissions such as CSRIs and TPMIs
  • a precoding matrix determination component 906 that determines a precoding matrix for PUSCH transmissions
  • a precoder component 908 that pre-codes UL data according to the determined precoding matrix
  • a transmission component that transmits UE capabilities and the
  • the apparatus may include additional components that perform each of the blocks of the algorithm in the aforementioned flowcharts of Figures 5, 6A, and 6B. As such, each block in the aforementioned flowcharts of Figures 5, 6A, and 6B may be performed by a component and the apparatus may include one or more of those components.
  • the components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.
  • FIG 10 is a diagram 1000 illustrating an example of a hardware implementation for an apparatus 902' employing a processing system 1014.
  • the processing system 1014 may be implemented with a bus architecture, represented generally by the bus 1024.
  • the bus 1024 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1014 and the overall design constraints.
  • the bus 1024 links together various circuits including one or more processors and/or hardware components, represented by the processor 1004, the components 904, 906, 908, and the computer-readable medium /memory 1006.
  • the bus 1024 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.
  • the processing system 1014 may be coupled to a transceiver 1010.
  • the transceiver 1010 is coupled to one or more antennas 1020.
  • the transceiver 1010 provides a means for communicating with various other apparatus over a transmission medium.
  • the transceiver 1010 receives a signal from the one or more antennas 1020, extracts information from the received signal, and provides the extracted information to the processing system 1014, specifically the reception component 904.
  • the transceiver 1010 receives information from the processing system 1014, specifically the transmission component 910, and based on the received information, generates a signal to be applied to the one or more antennas 1020.
  • the processing system 1014 includes a processor 1004 coupled to a computer-readable medium /memory 1006.
  • the processor 1004 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory 1006.
  • the software when executed by the processor 1004, causes the processing system 1014 to perform the various functions described supra for any particular apparatus.
  • the computer-readable medium /memory 1006 may also be used for storing data that is manipulated by the processor 1004 when executing software.
  • the processing system 1014 further includes at least one of the components 904, 906, 908.
  • the components may be software components running in the processor 1004, resident/stored in the computer readable medium /memory 1006, one or more hardware components coupled to the processor 1004, or some combination thereof.
  • the processing system 1014 may be a component of the UE 350 and may include the memory 360 and/or at least one of the TX processor 368, the RX processor 356, and the controller/processor 359.
  • the apparatus 902/902' for wireless communication includes means for indicating a UE capability for supporting PAPR-preserving precoding matrices, means for receiving a first indicator identifying a subset of TPMIs, means for receiving a second indicator identifying a TPMI of the subset of TPMIs, means for determining a precoding matrix, and means for transmitting the PUSCH according to the determined precoding matrix.
  • the aforementioned means may be one or more of the aforementioned components of the apparatus 902 and/or the processing system 1014 of the apparatus 902' configured to perform the functions recited by the aforementioned means.
  • the processing system 1014 may include the TX Processor 368, the RX Processor 356, and the controller/processor 359.
  • the aforementioned means may be the TX Processor 368, the RX Processor 356, and the controller/processor 359 configured to perform the functions recited by the aforementioned means.
  • FIG 11 is a conceptual data flow diagram 1100 illustrating the data flow between different means/components in an example apparatus 1102.
  • the apparatus may be a base station.
  • the apparatus includes a reception component 1104 that receives indications of a UE capability for supporting PAPR-preserving precoding matrices and that receives UL transmissions such as the PUSCH, a TPMI subset identification component 1106 that identifies a subset of TPMIs based at least in part on the indicated UE capability, a TPMI selection component 1108 that selects a TPMI of the subset of TPMIs based at least in part on a number of UE antenna ports configured for transmitting the PUSCH, and a transmission component 1110 that transmits the first indicator, the second indicator, downlink (DL) data, and control information, among other suitable transmissions.
  • a reception component 1104 that receives indications of a UE capability for supporting PAPR-preserving precoding matrices and that receives UL transmissions such as the
  • the apparatus may include additional components that perform each of the blocks of the algorithm in the aforementioned flowchart of Figure 7. As such, each block in the aforementioned flowchart of Figure 7 may be performed by a component and the apparatus may include one or more of those components.
  • the components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.
  • FIG. 12 is a diagram 1200 illustrating an example of a hardware implementation for an apparatus 1102' employing a processing system 1214.
  • the processing system 1214 may be implemented with a bus architecture, represented generally by the bus 1224.
  • the bus 1224 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 1214 and the overall design constraints.
  • the bus 1224 links together various circuits including one or more processors and/or hardware components, represented by the processor 1204, the components 1104, 1106, 1108, and the computer-readable medium /memory 1206.
  • the bus 1224 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.
  • the processing system 1214 may be coupled to a transceiver 1210.
  • the transceiver 1210 is coupled to one or more antennas 1220.
  • the transceiver 1210 provides a means for communicating with various other apparatus over a transmission medium.
  • the transceiver 1210 receives a signal from the one or more antennas 1220, extracts information from the received signal, and provides the extracted information to the processing system 1214, specifically the reception component 1104.
  • the transceiver 1210 receives information from the processing system 1214, specifically the transmission component 1110, and based on the received information, generates a signal to be applied to the one or more antennas 1220.
  • the processing system 1214 includes a processor 1204 coupled to a computer-readable medium /memory 1206.
  • the processor 1204 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory 1206.
  • the software when executed by the processor 1204, causes the processing system 1214 to perform the various functions described supra for any particular apparatus.
  • the computer-readable medium /memory 1206 may also be used for storing data that is manipulated by the processor 1204 when executing software.
  • the processing system 1214 further includes at least one of the components 1104, 1106, 1108.
  • the components may be software components running in the processor 1204, resident/stored in the computer readable medium /memory 1206, one or more hardware components coupled to the processor 1204, or some combination thereof.
  • the processing system 1214 may be a component of the base station 310 and may include the memory 376 and/or at least one of the TX processor 316, the RX processor 370, and the controller/processor 375.
  • the apparatus 1102/1102' for wireless communication includes means for receiving a UE capability for supporting PAPR-preserving precoding matrices, means for identifying a subset of TPMIs, means for transmitting a first indicator to the UE, means for selecting a TPMI of the subset of TPMIs based at least in part on a number of UE antenna ports configured for transmitting a PUSCH, means for transmitting a first indicator to the UE, and means for receiving the PUSCH.
  • the aforementioned means may be one or more of the aforementioned components of the apparatus 1102 and/or the processing system 1214 of the apparatus 1102' configured to perform the functions recited by the aforementioned means.
  • the processing system 1214 may include the TX Processor 368, the RX Processor 356, and the controller/processor 359.
  • the aforementioned means may be the TX Processor 368, the RX Processor 356, and the controller/processor 359 configured to perform the functions recited by the aforementioned means.
  • a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members.
  • “at least one of: a, b, or c” is intended to cover: a, b, c, a-b, a-c, b-c, and a-b-c.
  • the hardware and data processing apparatus used to implement the various illustrative logics, logical blocks, modules and circuits described in connection with the aspects disclosed herein may be implemented or performed with a general purpose single-or multi-chip processor, a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein.
  • a general purpose processor may be a microprocessor, or, any conventional processor, controller, microcontroller, or state machine.
  • a processor also may be implemented as a combination of computing devices (such as a combination of a DSP and a microprocessor) , a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • particular processes and methods may be performed by circuitry that is specific to a given function.
  • the functions described may be implemented in hardware, digital electronic circuitry, computer software, firmware, including the structures disclosed in this specification and their structural equivalents thereof, or in any combination thereof. Implementations of the subject matter described in this specification also can be implemented as one or more computer programs, i.e., one or more modules of computer program instructions, encoded on a computer storage media for execution by, or to control the operation of, data processing apparatus.
  • Computer-readable media includes both computer storage media and communication media including any medium that can be enabled to transfer a computer program from one place to another.
  • a storage media may be any available media that may be accessed by a computer.
  • such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that may be used to store desired program code in the form of instructions or data structures and that may be accessed by a computer.
  • Disk and disc includes compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media. Additionally, the operations of a method or algorithm may reside as one or any combination or set of codes and instructions on a machine readable medium and computer-readable medium, which may be incorporated into a computer program product.

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

Abstract

La présente divulgation concerne des systèmes, des procédés et un appareil, comprenant des programmes informatiques codés sur des supports d'enregistrement informatiques, qui peuvent conserver un rapport puissance crête à puissance moyenne (PAPR) de chaque port d'antenne d'un UE configuré pour transmettre un canal physique partagé montant (PUSCH). Dans certains modes de réalisation, l'UE peut transmettre le PUSCH à l'aide d'une matrice de précodage conservant le PAPR configurée pour mapper chaque port d'antenne d'UE sur au plus une couche du PUSCH, indépendamment du nombre de ports d'antenne d'UE configurés pour transmettre le PUSCH.
PCT/CN2020/084926 2020-04-15 2020-04-15 Conservation d'un rapport puissance crête à puissance moyenne (papr) de ports d'antenne d'équipement utilisateur (ue) WO2021207974A1 (fr)

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PCT/CN2020/084926 WO2021207974A1 (fr) 2020-04-15 2020-04-15 Conservation d'un rapport puissance crête à puissance moyenne (papr) de ports d'antenne d'équipement utilisateur (ue)

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PCT/CN2020/084926 WO2021207974A1 (fr) 2020-04-15 2020-04-15 Conservation d'un rapport puissance crête à puissance moyenne (papr) de ports d'antenne d'équipement utilisateur (ue)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115843053A (zh) * 2023-02-17 2023-03-24 深圳国人无线通信有限公司 基于5g小基站srs信号计算tpmi和ri的方法和装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019096843A1 (fr) * 2017-11-17 2019-05-23 Telefonaktiebolaget Lm Ericsson (Publ) Réseau d'antennes adaptatives à cohérence variable
CN110100394A (zh) * 2016-12-22 2019-08-06 三星电子株式会社 用于高级无线通信的上行链路多输入多输出码本
US20190327693A1 (en) * 2018-04-19 2019-10-24 Samsung Electronics Co., Ltd. Uplink power control for advanced wireless communication systems
CN110582980A (zh) * 2017-04-03 2019-12-17 三星电子株式会社 用于移动通信系统中基于分集的数据传输的方法和装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110100394A (zh) * 2016-12-22 2019-08-06 三星电子株式会社 用于高级无线通信的上行链路多输入多输出码本
CN110582980A (zh) * 2017-04-03 2019-12-17 三星电子株式会社 用于移动通信系统中基于分集的数据传输的方法和装置
WO2019096843A1 (fr) * 2017-11-17 2019-05-23 Telefonaktiebolaget Lm Ericsson (Publ) Réseau d'antennes adaptatives à cohérence variable
US20190327693A1 (en) * 2018-04-19 2019-10-24 Samsung Electronics Co., Ltd. Uplink power control for advanced wireless communication systems

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Physical channels and modulation (Release 15)", 3GPP STANDARD; TECHNICAL SPECIFICATION; 3GPP TS 38.211, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. V15.3.0, 27 September 2018 (2018-09-27), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , pages 1 - 96, XP051487429 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115843053A (zh) * 2023-02-17 2023-03-24 深圳国人无线通信有限公司 基于5g小基站srs信号计算tpmi和ri的方法和装置

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