WO2022027485A1 - Procédés de communication, dispositif terminal, dispositif de réseau et supports lisibles par ordinateur - Google Patents

Procédés de communication, dispositif terminal, dispositif de réseau et supports lisibles par ordinateur Download PDF

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Publication number
WO2022027485A1
WO2022027485A1 PCT/CN2020/107526 CN2020107526W WO2022027485A1 WO 2022027485 A1 WO2022027485 A1 WO 2022027485A1 CN 2020107526 W CN2020107526 W CN 2020107526W WO 2022027485 A1 WO2022027485 A1 WO 2022027485A1
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WIPO (PCT)
Prior art keywords
layer
positions
uplink data
mapped
terminal device
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PCT/CN2020/107526
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English (en)
Inventor
Yukai GAO
Lin Liang
Gang Wang
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Nec Corporation
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Priority to PCT/CN2020/107526 priority Critical patent/WO2022027485A1/fr
Publication of WO2022027485A1 publication Critical patent/WO2022027485A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • 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
    • H04B7/0404—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
    • H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication, and in particular, to methods for communication, terminal device, network device and computer-readable media.
  • NR new radio
  • FR2 frequency range 2
  • NR supports both single-carrier (for example, discrete fourier transform (DFT) spread orthogonal frequency division multiplexing (DFT-s-OFDM) or single carrier frequency division multiple access (SC-FDMA) or transmission with transform precoding) based waveform and multi-carrier (for example, cyclic-prefix orthogonal frequency division multiplexing (CP-OFDM) ) waveform, at least for enhanced mobile broadband (eMBB) uplink for up to 40GHz.
  • DFT discrete fourier transform
  • DFT-s-OFDM single carrier frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • multi-carrier for example, cyclic-prefix orthogonal frequency division multiplexing (CP-OFDM) waveform, at least for enhanced mobile broadband (eMBB) uplink for up to 40GHz.
  • the multi-carrier (e.g. CP-OFDM) based waveform can be used for both single-stream and multi-stream transmissions, while the single-carrier (e
  • DFT-s-OFDM DFT-s-OFDM
  • the use cases of the single-carrier (e.g. DFT-s-OFDM) based waveform include link budget limited cases and low cost user equipment (UEs) with a low-cost power amplifier.
  • UEs user equipment
  • example embodiments of the present disclosure provide a solution for transmitting reference signals.
  • a method of communication comprises: mapping, at a terminal device, a set of reference signals to a first layer of multiple layers for uplink transmission with transform precoding; and transmitting, to a network device, the uplink transmission with transform precoding.
  • a method of communication comprises receiving, at a network device and from a terminal device, uplink transmission with transform precoding, wherein a set of reference signals being mapped to a first layer of multiple layers for the uplink transmission with transform precoding; and obtaining the set of reference signals from the uplink transmission.
  • a terminal device in a third aspect, includes a processor; and a memory coupled to the processor and storing instructions thereon, the instructions, when executed by the processor, causing the terminal device to perform the method according to the first aspect.
  • the network device includes a processor; and a memory coupled to the processor and storing instructions thereon, the instructions, when executed by the processor, causing the network device to perform the method according to the second aspect.
  • a computer-readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to carry out the method according to the first aspect.
  • a computer-readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to carry out the method according to the second aspect.
  • FIG. 1 illustrate an example communication network in which embodiments of the present disclosure can be implemented
  • FIG. 2 shows a process of transmission according to some embodiments of the present disclosure
  • FIG. 3 is a diagram illustrating a mapping for reference signal and uplink data in accordance with some embodiments of the present disclosure
  • FIG. 4 is a diagram illustrating a mapping for reference signal and uplink data in accordance with some embodiments of the present disclosure
  • FIG. 5 is a diagram illustrating a mapping for reference signal and uplink data in accordance with some embodiments of the present disclosure
  • FIGS. 6A-6C are diagrams illustrating simulation results in accordance with some embodiments of the present disclosure, respectively;
  • FIG. 7 illustrates a flow chart of an example method of communication implemented at a terminal device in accordance with some embodiments of the present disclosure
  • FIG. 8 illustrates a flow chart of an example method of communication implemented at a network device in accordance with some embodiments of the present disclosure.
  • FIG. 9 is a simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure.
  • the term “network device” refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate.
  • a network device include, but not limited to, a Node B (NodeB or NB) , an Evolved NodeB (eNodeB or eNB) , a NodeB in new radio access (gNB) , a remote radio unit (RRU) , a radio head (RH) , a remote radio head (RRH) , a low power node such as a femto node, a pico node, a satellite network device, an aircraft network device, and the like.
  • NodeB Node B
  • eNodeB or eNB Evolved NodeB
  • gNB NodeB in new radio access
  • RRU remote radio unit
  • RH radio head
  • RRH remote radio head
  • a low power node such as a femto node, a pico node, a
  • terminal device refers to any device having wireless or wired communication capabilities.
  • the terminal device include, but not limited to, user equipments (UEs) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, tablets, wearable devices, internet of things (IoT) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices or evolved MTC (eMTC) devices, devices on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure/network, or image capture devices such as digital cameras, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing, and the like.
  • UE user equipment
  • communication device e.g., “terminal device”
  • terminal user equipment
  • UE user equipment
  • values, procedures, or apparatus are referred to as “best, ” “lowest, ” “highest, ” “minimum, ” “maximum, ” or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
  • NR new radio
  • FR2 frequency range 2
  • the terms “single-carrier” , “DFT-s-OFDM” , “SC-FDMA” , “uplink transform precoding” , “transform precoding enabled” and “transmission with transform precoding” may be used interchangeably.
  • the terms “multi-carrier” , “CP-OFDM” , “transform precoding not enabled” , “transform precoding disabled” , “transmission without transform precoding” and “OFDM” may be used interchangeably.
  • the terms “stream” , “layer” , “rank” and “port” may be used interchangeably.
  • modulation symbol “modulated symbol” , “complex symbol” , “complex-valued modulation symbol” , “complex-valued modulated symbol” and “complex-valued symbol” may be used interchangeably.
  • PA power amplifier
  • PAPR peak to average power ratio
  • NR supports both single-carrier based waveform and multi-carrier based waveform, at least for eMBB uplink for up to 40GHz.
  • the multi-carrier based waveform can be used for both single-stream and multi-stream transmissions, while the single-carrier based waveform is limited to single stream transmissions.
  • the use cases of the single-carrier based waveform include link budget limited cases and low cost UEs with a low-cost power amplifier.
  • DFT transform precoding
  • single-carrier by nature outperforms multi-carrier. Simulations have been performed for single-carrier and multi-carrier based waveforms. Simulation results show that single-carrier based waveform, which is limited to use single-carrier, has 2-3 dB gain over multi-carrier based waveform. As a result, in order to reduce PAPR, single-carrier based waveform solution would be preferred.
  • single-carrier transmission is achieved by performing transform precoding (e.g. performing discrete Fourier transform (DFT) ) .
  • transform precoding e.g. performing discrete Fourier transform (DFT)
  • DFT discrete Fourier transform
  • PTRS phase tracking reference signal
  • Embodiments of the present disclosure provide a solution for transmission of reference signals based on multiple layers for the uplink transmission with transform precoding.
  • a terminal device maps a set of reference signals to a first layer of multiple layers for uplink transmission with transform precoding. And the terminal device transmits, to a network device, the uplink transmission with transform precoding.
  • a solution for transmission of reference signals based on multiple layers for the uplink transmission with transform precoding is provided.
  • FIG. 1 shows an example communication network 100 in which implementations of the present disclosure can be implemented.
  • the network 100 includes a network device 110 and a terminal device 120 served by the network device 110.
  • the network 100 can provide at least one serving cell 102 to serve the terminal device 120. It is to be understood that the number of network devices, terminal devices and/or serving cells is only for the purpose of illustration without suggesting any limitations.
  • the network 100 may include any suitable number of network devices, terminal devices and/or serving cells adapted for implementing implementations of the present disclosure.
  • terminal device refers to any device having wireless or wired communication capabilities.
  • Examples of the terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, tablets, wearable devices, internet of things (IoT) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, device on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure/network, or image capture devices such as digital cameras, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like.
  • UE user equipment
  • PDAs personal digital assistants
  • IoT internet of things
  • IoE Internet of Everything
  • MTC machine type communication
  • X means pedestrian, vehicle, or infrastructure/network
  • image capture devices such as digital cameras, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like.
  • the term ‘network device’ or ‘base station’ (BS) refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate.
  • a network device include, but not limited to, a Node B (NodeB or NB) , an Evolved NodeB (eNodeB or eNB) , a next generation NodeB (gNB) , a Transmission Reception Point (TRP) , a Remote Radio Unit (RRU) , a radio head (RH) , a remote radio head (RRH) , a low power node such as a femto node, a pico node, and the like.
  • NodeB Node B
  • eNodeB or eNB Evolved NodeB
  • gNB next generation NodeB
  • TRP Transmission Reception Point
  • RRU Remote Radio Unit
  • RH radio head
  • RRH remote radio head
  • a low power node such as a fem
  • the terminal device 120 may be connected with a first network device and a second network device (not shown in FIG. 1) .
  • One of the first network device and the second network device may be in a master node and the other one may be in a secondary node.
  • the first network device and the second network device may use different radio access technologies (RATs) .
  • the first network device may be a first RAT device and the second network device may be a second RAT device.
  • the first RAT device may be an eNB and the second RAT device is a gNB.
  • Information related to different RATs may be transmitted to the terminal device 120 from at least one of the first network device and the second network device.
  • first information may be transmitted to the terminal device 120 from the first network device and second information may be transmitted to the terminal device 120 from the second network device directly or via the first network device.
  • information related to configuration for the terminal device configured by the second network device may be transmitted from the second network device via the first network device.
  • Information related to reconfiguration for the terminal device configured by the second network device may be transmitted to the terminal device from the second network device directly or via the first network device.
  • the information may be transmitted via any of the following: Radio Resource Control (RRC) signaling, Medium Access Control (MAC) control element (CE) or Downlink Control Information (DCI) .
  • RRC Radio Resource Control
  • MAC Medium Access Control
  • CE Control element
  • DCI Downlink Control Information
  • the network device 110 can communicate data and control information to the terminal device 120 and the terminal device 120 can also communication data and control information to the network device 110.
  • a link from the network device 110 to the terminal device 120 is referred to as a downlink (DL)
  • a link from the terminal device 120 to the network device 110 is referred to as an uplink (UL) .
  • the communications in the network 100 may conform to any suitable standards including, but not limited to, Global System for Mobile Communications (GSM) , Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) , GSM EDGE Radio Access Network (GERAN) , Machine Type Communication (MTC) and the like.
  • GSM Global System for Mobile Communications
  • LTE Long Term Evolution
  • LTE-Evolution LTE-Advanced
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • GERAN GSM EDGE Radio Access Network
  • MTC Machine Type Communication
  • Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols.
  • the network device 110 may send a RS to the terminal device 120 in a downlink.
  • the terminal device 120 may transmit a RS to the network device 110 in an uplink.
  • a RS is a signal sequence (also referred to as “RS sequence” ) that is known by both the network device 110 and the terminal devices 120.
  • a RS sequence may be generated and transmitted by the network device 110 based on a certain rule and the terminal device 120 may deduce the RS sequence based on the same rule.
  • a RS sequence may be generated and transmitted by the terminal device 120 based on a certain rule and the network device 110 may deduce the RS sequence based on the same rule.
  • Examples of the RS may include but are not limited to downlink or uplink Demodulation Reference Signal (DMRS) , CSI-RS, Sounding Reference Signal (SRS) , Phase Tracking Reference Signal (PTRS) , Tracking Reference Signal (TRS) , fine time-frequency Tracking Reference Signal (TRS) , CSI-RS for tracking, Positioning Reference Signal (PRS) and so on.
  • DMRS downlink or uplink Demodulation Reference Signal
  • SRS Sounding Reference Signal
  • PTRS Phase Tracking Reference Signal
  • TRS Tracking Reference Signal
  • TRS fine time-frequency Tracking Reference Signal
  • CSI-RS for tracking
  • PRS Positioning Reference Signal
  • SRS can be used by the network device 110 to perform uplink channel estimation, so as to perform resource allocation and configure transmission parameters for UL transmission from the terminal device 120 based on the result of the uplink channel estimation.
  • FIG. 2 shows a process of transmission according to some embodiments of the present disclosure.
  • the process 200 will be described with reference to FIG. 1.
  • the process 200 may involve the network device 110 and the terminal device 120 as shown in FIG. 1. It is to be understood that the process 200 may include additional acts not shown and/or may omit some acts as shown, and the scope of the present disclosure is not limited in this regard.
  • a terminal device 120 maps 202 a set of reference signals to a first layer of multiple layers for uplink transmission with transform precoding.
  • the uplink transmission may be a transmission based on DFT-s-OFDM.
  • the uplink transmission may be a transmission based on single carrier frequency division multiple access (SC-FDMA) .
  • SC-FDMA single carrier frequency division multiple access
  • the uplink transmission may be a transmission with transform precoding enabled.
  • the uplink transmission may be a transmission based on single-carrier waveform.
  • the network device 110 may transmit a message to the terminal device 120, indicating to enable the transform precoding. As such, the terminal device 120 may enable the transform precoding accordingly.
  • the terminal device 120 transmits 204, to the network device 110, the uplink transmission with transform precoding.
  • the network device 110 After receiving from the terminal device 120 the uplink transmission, the network device 110 obtains 206 the set of reference signals from the uplink transmission accordingly.
  • FIG. 3 is a diagram illustrating a mapping for reference signal and uplink data in accordance with some embodiments of the present disclosure.
  • samples for PTRS mapping is not used for PUSCH data mapping in all layers, thus PTRS may only be mapped to N layers. In other words, there is no sample for PTRS mapped to the remaining M-N layers.
  • PUSCH data 302 and samples for PTRS 304 are mapped, at the terminal device 120, to Layer 1 for uplink transmission with transform precoding.
  • a reference signal e.g. PTRS
  • the set of reference signals could map to a first layer firstly and the rest reference signal in the set of reference signals could map accordingly one by one.
  • multiple PTRS samples in a group could map to a first layer following one by one order.
  • multiple reference signals (e.g. PTRS) in the set of reference signals could map to a first layer at the same time and the rest reference signal in the set of reference signals could map to the first layer at the next same time.
  • multiple PTRS samples in a group could map to a first layer at the same time and the rest PTRS samples in the group could map to the first layer together at the next time.
  • a set of reference signal e.g. PTRS
  • multiple PTRS samples in a group could map to a first layer at the same time.
  • the PUSCH data 306 is mapped, at the terminal device 120, to Layer 2 for uplink transmission.
  • predetermined values may be mapped to positions that correspond to the positions onto which samples for PTRS 304 are mapped.
  • the predetermined values may be set to be empty 308. In some other embodiments, the predetermined values may be set to be zero.
  • the number of modulation symbols of the PUSCH data in Layer 1 is equal to the number of modulation symbols of the PUSCH data in Layer 2.
  • uplink data of one or two codewords may be mapped on Layers 1 and 2 for transmission.
  • a terminal device 120 may assume that complex-valued modulation symbols for each of the codewords to be transmitted are mapped onto one or several layers.
  • q is an integer, and q may be at least one of ⁇ 0, 1 ⁇ .
  • T represents transposition of matrix or vector.
  • the value of q may be fixed to be 0.
  • Table 1 below shows an example of codeword to layer mapping.
  • the terminal device 120 may be configured with M layers for uplink transmission.
  • the terminal device 120 may be configured with ⁇ layers transmission.
  • the ⁇ layers transmission is transmitted with single-carrier based waveform.
  • the terminal device 120 may be configured with PTRS transmission.
  • PTRS is used according to the procedure in clause 6.2.3 of TS 38.214.
  • the terminal device 120 may be configured with N port PTRS.
  • N ⁇ ⁇ .
  • the value of N may be fixed to be 1. For example, for the transmission with single-carrier based waveform.
  • PTRS samples may be configured to be mapped on layer j′, and 0 ⁇ j′ ⁇ v-1. In some embodiments, PTRS samples may be configured to be mapped on layer j′ and j′′, and 0 ⁇ j′ ⁇ v-1, 0 ⁇ j′′ ⁇ v-1, j′ ⁇ j′′.
  • the terminal device 120 may be configured with a set of antenna ports P (For example, ⁇ p 0 , ...p ⁇ -1 ⁇ ) for uplink transmission. For example, for SRS transmission. For another example, for PUSCH transmission.
  • the value of p t may be any one of ⁇ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 ⁇ or any one of ⁇ 1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007, 1008, 1009, 1010, 1011 ⁇ or any one of ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ or any one of ⁇ 1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007 ⁇ or any one of ⁇ 0, 1, 2, 3 ⁇ or any one of ⁇ 1000, 1001, 1002, 1003 ⁇ .
  • ⁇ may be configured by network device, and ⁇ is an integer.
  • ⁇ v.
  • the terminal device 120 may be configured with a set of antenna ports (For example, ) .
  • the terminal device 120 may transmit PUSCH using the same antenna port (s) as the SRS port (s) in the SRS resource indicated by a PDCCH (for example, DCI format 0_1 or 0_2) or configured by higher layer parameter (for example, configuredGrandConfig) .
  • the terminal device 120 may transmit PUSCH using the same antenna port (s) as the SRS port (s) in the SRS resource indicated by SRS resource indicator (SRI) in a PDCCH (for example, DCI format 0_1 or 0_2) or configured by higher layer parameter (for example, configuredGrandConfig) in increasing order.
  • the DMRS antenna ports may be determined according to the ordering of DMRS port (s) given by Table 7.3.1.1.2-6 to 7.3.1.1.2-23 in Clause 7.3.1.1.2 of TS 38.212.
  • the terminal device 120 may perform one to one mapping from the indicated SRI (s) to the indicated DMRS port (s) and their corresponding PUSCH layers ⁇ 0, 1, ...v-1 ⁇ given by a PDCCH (for example, DCI format 0_1 or 0_2) or by higher layer parameter (for example, configuredGrandConfig) in increasing order.
  • a PDCCH for example, DCI format 0_1 or 0_2
  • higher layer parameter for example, configuredGrandConfig
  • a block of vector may be mapped to the set of antenna ports P (For example, ⁇ p 0 , ...p ⁇ -1 ⁇ ) , where ⁇ is the number of layers and is the number of modulation symbols per layer.
  • the vector [y (0) (i) ...y ( ⁇ -1) (i) ] T may be precoded according to
  • the set of antenna ports P may be determined according to the procedure in TS 38.214.
  • the vector [y (0) (i) ...y ( ⁇ -1) (i) ] T may be a block of complex-valued symbols after transform precoding for uplink transmission.
  • W is a precoding matrix.
  • the precoding matrix W is configured for the terminal device 120.
  • the precoding matrix W may be given by Tables 6.3.1.5-1 to 6.3.1.5-7 in TS 38.211 with the TPMI index obtained from the DCI scheduling the uplink transmission or the higher layer parameters according to the procedure in TS38.214.
  • codebook-based transmission is configured for the terminal device 120.
  • the association between PTRS port (s) and DMRS port (s) is signaled in PDCCH. For example, signaled by PTRS-DMRS association field in DCI format 0_1 and DCI format 0_2.
  • the terminal device 120 may assume the association between PTRS port (s) and DMRS port (s) defined by value 0 in Table 7.3.1.1.2-25 or value "00" in Table 7.3.1.1.1.2-26 described in Clause 7.3.1 of TS38.212.
  • the PTRS port is associated with the lowest indexed DMRS antenna port among the configured DMRS antenna ports.
  • the PTRS port is associated with DM-RS port 0.
  • the actual number of PTRS port (s) to transmit is determined based on SRI (s) in a PDCCH (for example, DCI format 0_1 and DCI format 0_2) or higher layer parameter (for example, sri-ResourceIndicator in rrc-ConfiguredUplinkGrant) .
  • the terminal device 120 may be configured with the PTRS port index for each configured SRS resource by the higher layer parameter (for example, ptrs-PortIndex configured by SRS-Config if the UE is configured with the higher layer parameter phaseTrackingRS in DMRS-UplinkConfig) .
  • the PTRS port index associated with different SRIs are the same, the corresponding DMRS ports are associated to the configured one PT-RS port.
  • the actual number of PTRS port (s) is determined based on Transmitted Precoding Matrix Indicator (TPMI) and/or number of layers which are indicated by a PDCCH (For example, indicated by Precoding information and number of layers field in DCI format 0_1 and DCI format 0_2) or configured by higher layer parameter (For example, precodingAndNnumberOfLayers) .
  • TPMI Transmitted Precoding Matrix Indicator
  • the terminal device 120 is configured with the higher layer parameter (for example, maxNrofPorts in PTRS-UplinkConfig set to 'n2' or set to 2)
  • the actual PTRS port (s) and the associated transmission layer (s) are derived from indicated TPMI as: PUSCH antenna port 1000 and 1002 in indicated TPMI share PTRS port 0, and PUSCH antenna port 1001 and 1003 in indicated TPMI share PTRS port 1.
  • PTRS port 0 is associated with the uplink layer 'x' of layers which are transmitted with PUSCH antenna port 1000 and PUSCH antenna port 1002 in indicated TPMI
  • PTRS port 1 is associated with the uplink layer 'y' of layers which are transmitted with PUSCH antenna port 1001 and PUSCH antenna port 1003 in indicated TPMI, where 'x' and/or 'y' are given by a PDCCH (for example, DCI parameter PTRS-DMRS association as shown in DCI format 0_1 and DCI format 0_2 described in Clause 7.3.1 of TS38.212) .
  • PDCCH for example, DCI parameter PTRS-DMRS association as shown in DCI format 0_1 and DCI format 0_2 described in Clause 7.3.1 of TS38.212
  • phase-tracking reference signal on layer j is given by
  • j′ and j" are the layers which PTRS is configured to be mapped.
  • j′ and j" are the layers which PTRS is configured to be mapped.
  • antenna ports for PTRS transmission For example, antenna ports or are associated to the configured DMRS ports.
  • the phase-tracking reference signal is mapped in position m before transform precoding, where m depends on the number of PT-RS groups the number of samples per PT-RS group and according to Table 2 (or Table 6.4.1.2.2.2-1 in TS 38.211) , and the sequence r m (m′) shall be generated according to
  • pseudo-random sequence generator shall be initialized with
  • N ID is an identity to generate the initialization value, which is given by the higher-layer parameter nPUSCH-Identity.
  • Table 2 PT-RS symbol mapping.
  • the network device 110 and the terminal device 120 may communicate with each other based on time slots (or slots for short) as defined in the 3GPP specifications.
  • time slots or slots for short
  • OFDM Orthogonal Frequency Division Multiplexing
  • Table 3 Number of OFDM symbols per slot, slots per frame, and slots per subframe for normal cyclic prefix.
  • Table 4 Number of OFDM symbols per slot, slots per frame, and slots per subframe for extended cyclic prefix.
  • the block of complex-valued symbols shall be divided into sets, each set corresponding to one OFDM symbol, and where set l contains symbols and is mapped to the complex-valued symbols corresponding to OFDM symbol l prior to transform precoding, with and i′ ⁇ m.
  • the index m of PT-RS samples in set l, the number of samples per PT-RS group and the number of PT-RS groups are defined in clause 6.4.1.2.2.2.
  • PTRS is only mapped to one layer (for example, Layer 1) , and for the second layer, zero or null is mapped on the same position for PTRS samples in OFDM symbol prior to transform precoding.
  • Layer 1 For example, Layer 1
  • Layer 2 For example, Layer 1
  • null is mapped on the same position for PTRS samples in OFDM symbol prior to transform precoding.
  • there is less interference to PTRS that is, good interference protection is provided for PTRS.
  • some positions are mapped with empty or zero, other than uplink data on the second layer for transmission, resource is wasted.
  • PAPR is not good in this case.
  • FIG. 4 is a diagram illustrating a mapping for reference signal and uplink data in accordance with some embodiments of the present disclosure. For the purpose of illustration, two layers are shown in FIG. 4, however, it shall be understood that the number of layers for uplink transmission is not limited in this regard.
  • Layers 1 and 2 there are two layers (i.e. Layers 1 and 2) for transmission.
  • samples for PTRS are mapped on Layer 1 but not on Layer 2.
  • FIG. 4 may also be called Case 2 herein.
  • PUSCH data 402 and samples for PTRS 404 are mapped, at the terminal device 120, to Layer 1 for uplink transmission with transform precoding. Further, the PUSCH data 406 is mapped, at the terminal device 120, to Layer 2 for uplink transmission. Moreover, in this example, a predetermined sequence may be mapped to positions that correspond to the positions onto which samples for PTRS 404 are mapped.
  • the predetermined values may be generated to be orthogonal to the sequence of the reference signal.
  • the sequence may be an Orthogonal Cover Code (OCC) sequence.
  • OCC Orthogonal Cover Code
  • the number of modulation symbols of the PUSCH data in Layer 1 is equal to the number of modulation symbols of the PUSCH data in Layer 2.
  • PUSCH data 402 and 406 on Layers 1 and 2 may constitute a codeword.
  • An example of codeword to layer mapping is shown in Table 1 mentioned above.
  • phase-tracking reference signal on layer j is given by
  • j′ and j" are the layers which PTRS is configured to be mapped.
  • j′ and j" are the layers which PTRS is configured to be mapped.
  • antenna ports for PTRS transmission For example, antenna ports or are associated to the configured DMRS ports.
  • the phase-tracking reference signal is mapped in position m before transform precoding, where m depends on the number of PT-RS groups the number of samples per PT-RS group and (for example according to Table 6.4.1.2.2.2-1 in TS 38.211) , and the sequence r m (m′) and s m (m′) shall be generated according to
  • pseudo-random sequence generator shall be initialized with
  • N ID is given by the higher-layer parameter nPUSCH-Identity.
  • Table 5A The orthogonal sequence w (i) .
  • X j′ or j′′.
  • U is an integer, and U may be at least one of ⁇ 0, 1, 2, 3 ⁇ .
  • U j′ or j′′.
  • PTRS is only mapped to one layer (for example, Layer 1) , and for the second layer, a predetermined sequence orthogonal to the sequence of the reference is generated and is mapped on the same position for PTRS samples in OFDM symbol prior to transform precoding.
  • Layer 1 For example, Layer 1
  • a predetermined sequence orthogonal to the sequence of the reference is generated and is mapped on the same position for PTRS samples in OFDM symbol prior to transform precoding.
  • there is less interference to PTRS that is, good interference protection is provided for PTRS.
  • the orthogonal sequence, other than uplink data is mapped on the second layer for transmission, resource is wasted.
  • PAPR is good in this case.
  • PAPR in this case is better than the one in which zeros are mapped on the same positions for PTRS samples. Simulation results will be shown in the followings showing the performance of different cases.
  • FIG. 5 is a diagram illustrating a mapping for reference signal and uplink data in accordance with some embodiments of the present disclosure. For the purpose of illustration, two layers are shown in FIG. 5, however, it shall be understood that the number of layers for uplink transmission is not limited in this regard.
  • Layers 1 and 2 there are two layers (i.e. Layers 1 and 2) for transmission.
  • samples for PTRS are mapped on Layer 1 but not on Layer 2.
  • PUSCH data is mapped in all samples.
  • FIG. 5 may also be called Case 1 herein.
  • PUSCH data 502 and samples for PTRS 504 are mapped, at the terminal device 120, to Layer 1 for uplink transmission with transform precoding. Further, the PUSCH data 506 are mapped, at the terminal device 120, to Layer 2 for uplink transmission. Moreover, in this example, PUSCH 508 may be mapped to positions that correspond to the positions onto which samples for PTRS 504 are mapped.
  • PUSCH data 502, 506 and 508 on Layers 1 and 2 may constitute a codeword.
  • the number of modulation symbols of the PUSCH data in some of layers may be different from the number of modulation symbols of the PUSCH data in the other layers.
  • Table 6 shows an example of codeword to layer mapping.
  • the block of complex-valued symbols shall be divided into sets, each set corresponding to one OFDM symbol, and where set l contains symbols and is mapped to the complex-valued symbols corresponding to OFDM symbol l prior to transform precoding, with and i′ ⁇ m.
  • the index m of PT-RS samples in set l, the number of samples per PT-RS group and the number of PT-RS groups are defined in clause 6.4.1.2.2.2.
  • j′ and j" are the layers which PTRS is configured to be mapped.
  • j′ and j" are the layers which PTRS is configured to be mapped.
  • antenna ports for PTRS transmission For example, antenna ports or are associated to the configured DMRS ports.
  • PTRS is only mapped to one layer (for example Layer 1) , and for the second layer, PUSCH data is mapped on the same position for PTRS samples in OFDM symbol prior to transform precoding.
  • Layer 1 For example, since PUSCH data is mapped in all samples on the second layer for transmission, resource is used more efficiently.
  • PAPR is good in this case.
  • PAPR in this case is better than the one in which zeros are mapped on the same position for PTRS samples.
  • there may be some interference to PTRS that is, the interference protection for PTRS is not very good. Simulation results will be shown in the following.
  • the layer/port onto which PTRS will be mapped may be associated with DMRS port number. In some embodiments, the layer/port onto which PTRS will be mapped may be associated with the lowest DMRS port number.
  • the layer/port onto which PTRS will be mapped may be indicated with one bit. That is the bit is used to indicate whether PTRS will be put onto layer one or layer two.
  • Table 7 below shows PTRS-DMRS association for UL PTRS port 0. In the table, if the value of the bit is zero, PTRS is mapped to the first scheduled DMRS port, that is, PTRS is mapped to the first layer. If the value of the bit is one, PTRS is mapped to the second scheduled DMRS port, that is, PTRS is mapped to the second layer.
  • the example only shows PTRS is present on one layer, that is, one port PTRS is configured, however, the number of layers in which PTRS is present is not limited in this regard.
  • the network device 110 may configure both DFT-s-OFDM and PTRS enabled/configured in signaling. For example, the network device 110 may transmit a RRC message to terminal device 120, and in the RRC message, it may indicate to use DFT-s-OFDM and to enable/configure PTRS. As such, the terminal device 120 may use single-carrier based transmission. The number of layers used for transmission may be determined during scheduling dynamically.
  • whether to use case 0/1/2 may be determined/preconfigured in advance in the standard.
  • FIGS. 6A-6C is a diagram illustrating simulation results in accordance with some embodiments of the present disclosure.
  • the line formed with dots represents the simulation result for Case 0, in which zero is mapped on the same position for PTRS samples in OFDM symbols prior to transform precoding;
  • the line formed with dashes represents the simulation result for Case 1, in which PUSCH data is mapped in all sample for layers onto which there is no PTRS being mapped.
  • the solid line represents the simulation result for Case 2, in which orthogonal sequence (s) are mapped on the same position for PTRS in OFDM symbol prior to transform precoding for layers onto which there is no PTRS being mapped.
  • the axis-x represent PAPR in x dB and axis-y represent the probability that PAPR is below or equally to x dB.
  • FIG. 6A shows a diagram illustrating simulation results with pi/2 BPSK. From FIG. 5A, it can be seen that, with respect to the PAPR, the result of Case 2 is better than that of Case 0 and is similar to Case 1. In addition, although the result of Case 0 is the worst among the three, it is still acceptable.
  • FIGS. 6B and 6C show a diagram illustrating simulation results with QPSK and 16QAM, respectively. Similar trends and results are shown in the two figures and in FIG. 5A.
  • FIG. 7 illustrates a flowchart of an example method 700 in accordance with some embodiments of the present disclosure.
  • the method 700 can be implemented at a terminal device 120 as shown in FIG. 1. It is to be understood that the method 700 may include additional blocks not shown and/or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard. For the purpose of discussion, the method 700 will be described from the perspective of the terminal device 120 with reference to FIG. 1.
  • the terminal device 120 maps a set of reference signals to a first layer of multiple layers for uplink transmission with transform precoding. Then, at block 720, the terminal device 120 transmits, to a network device, the uplink transmission with transform precoding.
  • the uplink transmission is a transmission based on one of: discrete fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) , transform precoding enabled, and single carrier frequency division multiple access (SC-FDMA) .
  • DFT-s-OFDM discrete fourier transform spread orthogonal frequency division multiplexing
  • SC-FDMA single carrier frequency division multiple access
  • the terminal device 120 maps the set of reference signals to the first layer comprises mapping the set of reference signal and a first portion of uplink data to the first layer for the uplink transmission with transform precoding.
  • the first portion of uplink data is mapped to a first set of positions on the first layer and the set of reference signals being mapped to a second set of positions on the first layer.
  • the multiple layers further comprise a second layer, and the method further comprising maps a second portion of the uplink data to a third set of positions on the second layer for the uplink transmission with transform precoding, the third set of positions corresponding to the first set of positions.
  • the terminal device 120 maps the second portion of the uplink data comprises that the terminal device 120 maps predetermined values to a fourth set of positions on the second layer, the fourth set of positions corresponding to the second set of positions.
  • the method further comprises the terminal device 120 sets the predetermined values to be empty or zero.
  • the fourth set of positions corresponds to the second set of positions.
  • the method further comprises the terminal device 120 generates the predetermined sequence to be orthogonal to a sequence of the set of reference signals.
  • a size of the first portion of the uplink data is equal to a size of the second portion of the uplink data.
  • the terminal device 120 maps the second portion of the uplink data comprises the terminal device 120 maps a third portion of the uplink data to a fourth set of positions on the second layer.
  • the fourth set of positions corresponds to the second set of positions.
  • a size of the first portion of the uplink data is equal to a size of the second portion of the uplink data, and a size of the third portion of the uplink data is different from the size of the first portion of the uplink data or the size of the second portion of the uplink data.
  • FIG. 8 illustrates a flowchart of an example method 800 in accordance with some embodiments of the present disclosure.
  • the method 800 can be implemented at the network device 110 as shown in FIG. 1. It is to be understood that the method 800 may include additional blocks not shown and/or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard. For the purpose of discussion, the method 800 will be described from the perspective of the network device 110 with reference to FIG. 1.
  • the network device 110 receives from a terminal device 120 uplink transmission with transform precoding, wherein a set of reference signals being mapped to a first layer of multiple layers for the uplink transmission with transform precoding. Then, at block 820, the network device 110 obtains the set of reference signals from the uplink transmission.
  • the uplink transmission is a transmission based on one of: discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) , transform precoding enabled, and single carrier frequency division multiple access (SC-FDMA) .
  • DFT-s-OFDM discrete Fourier transform spread orthogonal frequency division multiplexing
  • SC-FDMA single carrier frequency division multiple access
  • the multiple layers further comprise a second layer
  • receiving the uplink transmission comprises: receiving the set of reference signals and uplink data mapped to the first layer and the second layer.
  • a first portion of the uplink data is mapped to a first set of positions on the first layer, and a second portion of the uplink data is mapped to a third set of positions on the second layer, the third set of positions corresponding to the first set of positions.
  • predetermined values are mapped to a fourth set of positions on the second layer.
  • the fourth set of positions corresponds to the second set of positions.
  • the predetermined values are empty or zero.
  • a predetermined sequence is mapped to a fourth set of positions on the second layer.
  • the fourth set of positions corresponds to the second set of positions.
  • the predetermined sequence is orthogonal to a sequence of the set of reference signals.
  • a size of the first portion of the uplink data is equal to a size of the second portion of the uplink data.
  • a third portion of the uplink data is mapped to a fourth set of positions on the second layer, the fourth set of positions corresponding to the second set of positions.
  • a size of the first portion of the uplink data is equal to a size of the second portion of the uplink data, and a size of the third portion of the uplink data is different from the size of the first portion of the uplink data or the size of the second portion of the uplink data.
  • FIG. 9 is a simplified block diagram of a device 900 that is suitable for implementing embodiments of the present disclosure.
  • the device 900 can be considered as a further example implementation of the terminal device 120 or the network device 110 as shown in FIG. 1. Accordingly, the device 900 can be implemented at or as at least a part of the terminal device 120 or the network device 110.
  • the device 900 includes a processor 910, a memory 920 coupled to the processor 910, a suitable transmitter (TX) and receiver (RX) 940 coupled to the processor 910, and a communication interface coupled to the TX/RX 940.
  • the memory 910 stores at least a part of a program 930.
  • the TX/RX 940 is for bidirectional communications.
  • the TX/RX 940 has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this application may have several ones.
  • the communication interface may represent any interface that is necessary for communication with other network elements, such as X2 interface for bidirectional communications between eNBs, S1 interface for communication between a Mobility Management Entity (MME) /Serving Gateway (S-GW) and the eNB, Un interface for communication between the eNB and a relay node (RN) , or Uu interface for communication between the eNB and a terminal device.
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • Un interface for communication between the eNB and a relay node (RN)
  • Uu interface for communication between the eNB and a terminal device.
  • the program 930 is assumed to include program instructions that, when executed by the associated processor 910, enable the device 900 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to FIGS. 2-9.
  • the embodiments herein may be implemented by computer software executable by the processor 910 of the device 900, or by hardware, or by a combination of software and hardware.
  • the processor 910 may be configured to implement various embodiments of the present disclosure.
  • a combination of the processor 910 and memory 910 may form processing means 950 adapted to implement various embodiments of the present disclosure.
  • the memory 910 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer-readable storage medium, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 910 is shown in the device 900, there may be several physically distinct memory modules in the device 900.
  • the processor 910 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 900 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the process or method as described above with reference to FIGS. 2-7.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the above program code may be embodied on a machine readable medium, which may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
  • the machine readable medium may be a machine readable signal medium or a machine readable storage medium.
  • a machine readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.
  • machine readable storage medium More specific examples of the machine readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
  • RAM random access memory
  • ROM read-only memory
  • EPROM or Flash memory erasable programmable read-only memory
  • CD-ROM portable compact disc read-only memory
  • magnetic storage device or any suitable combination of the foregoing.

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Abstract

Des modes de réalisation de la présente invention concernent des procédés de communication, un dispositif terminal, un dispositif de réseau et des supports lisibles par ordinateur. Dans le procédé, un dispositif terminal mappe un ensemble de signaux de référence à une première couche de couches multiples pour une transmission en liaison montante avec un précodage par transformée. En outre, le dispositif terminal transmet, à un dispositif de réseau, la transmission en liaison montante avec un précodage par transformée.
PCT/CN2020/107526 2020-08-06 2020-08-06 Procédés de communication, dispositif terminal, dispositif de réseau et supports lisibles par ordinateur WO2022027485A1 (fr)

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WO2014015800A1 (fr) * 2012-07-24 2014-01-30 电信科学技术研究院 Procédé et dispositif de transmission de signal de référence de démodulation spécifique d'équipement utilisateur en liaison descendante
WO2017167156A1 (fr) * 2016-04-01 2017-10-05 中兴通讯股份有限公司 Procédé et dispositif de transmission de dmrs
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WO2014015800A1 (fr) * 2012-07-24 2014-01-30 电信科学技术研究院 Procédé et dispositif de transmission de signal de référence de démodulation spécifique d'équipement utilisateur en liaison descendante
WO2017167156A1 (fr) * 2016-04-01 2017-10-05 中兴通讯股份有限公司 Procédé et dispositif de transmission de dmrs
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