WO2019103550A1 - Procédé d'émission ou de réception de signal de liaison descendante entre un terminal et une station de base dans un système de communication sans fil, et appareil prenant en charge celui-ci - Google Patents

Procédé d'émission ou de réception de signal de liaison descendante entre un terminal et une station de base dans un système de communication sans fil, et appareil prenant en charge celui-ci Download PDF

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Publication number
WO2019103550A1
WO2019103550A1 PCT/KR2018/014609 KR2018014609W WO2019103550A1 WO 2019103550 A1 WO2019103550 A1 WO 2019103550A1 KR 2018014609 W KR2018014609 W KR 2018014609W WO 2019103550 A1 WO2019103550 A1 WO 2019103550A1
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dmrs
terminal
receiving
downlink signal
base station
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PCT/KR2018/014609
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English (en)
Korean (ko)
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이길봄
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엘지전자 주식회사
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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the following description relates to a wireless communication system and a method for transmitting and receiving a downlink signal between a terminal and a base station in a wireless communication system and a device supporting the same.
  • Wireless access systems are widely deployed to provide various types of communication services such as voice and data.
  • a wireless access system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
  • multiple access systems include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, a single carrier frequency division multiple access) systems.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • next-generation RAT which takes into account such improved mobile broadband communications, massive MTC, and Ultra-Reliable and Low Latency Communication (URLLC), is being discussed.
  • phase tracking reference signal for estimating the phase noise between the UE and the base station in the various frequency bands.
  • An object of the present invention is to provide a method for transmitting and receiving a downlink signal between a terminal and a base station in a wireless communication system and devices supporting the same.
  • the present invention provides a method for transmitting / receiving a downlink signal between a terminal and a base station in a wireless communication system and apparatuses therefor.
  • a method of receiving a downlink signal in a wireless communication system comprising: receiving information on a demodulation reference signal (DMRS) port index allocated to the terminal from a base station; And receiving a downlink signal including a phase tracking reference signal (PT-RS) transmitted over a plurality of sub-carriers for the allocated DMRS port index, the PT- (OCC), and the OCC is determined based on the allocated DMRS port index.
  • DMRS demodulation reference signal
  • PT-RS phase tracking reference signal
  • the PT-RS may be received through a plurality of second resource blocks spaced apart from each other by a predetermined interval among a plurality of consecutive first resource blocks.
  • the location of the second resource blocks among the plurality of consecutive first resource blocks is determined based on at least one of the physical cell identifier, the virtual cell identifier, the terminal identifier, or the information indicated by the upper layer signaling Can be determined.
  • the location of a plurality of sub-carriers for receiving the PT-RS in one of the second resource blocks may be determined based on a demodulation reference signal port index allocated to the UE from the BS.
  • the location of a plurality of sub-carriers for which the PT-RS is received in one of the second resource blocks may be determined based on a physical cell identifier, a virtual cell identifier, May be determined based on one or more of the information indicated by the higher layer signaling.
  • the method may further include receiving information on the number of CDRS (Code Division Multiplexing) groups from the base station.
  • the MS determines whether there is a PT-RS transmitted to another MS based on at least one of the number of the DMRS CDM groups and the DMRS port index assigned to the MS, and whether the PT-RS transmitted to the MS is power-boosted , And can receive the downlink signal including the PT-RS based on the determination.
  • CDRS Code Division Multiplexing
  • the MS receiving the information indicating that the number of the DMRS CDM group is 1 from the BS can receive the downlink signal on the assumption that there is no PT-RS transmitted from the BS to another MS.
  • the MS receiving the downlink signal transmits data in the resource area for the PT-RS of the DMRS CDM group not associated with the MS It is possible to receive the downlink signal.
  • the terminal upon receiving the information indicating that the number of the DMRS CDM group is 1 from the BS, the terminal determines whether the PT-RS is in a state of being connected to the DMRS CDM group RS, the PT-RS, and the PT-RS.
  • the MS when receiving information indicating that a plurality of DMRS CDM groups are received from the BS and all the DMRS port indices allocated to the MS are included in one CDM group, the MS transmits PT-RS The downlink signal can be received.
  • the terminal receiving the downlink signal on the assumption that there is a PT-RS transmitted from the base station to another terminal transmits one or more PT-RSs having an association with one or more DMRS CDM groups not associated with the terminal, It is possible to receive the downlink signal on the assumption that data is not transmitted in the resource region for RS.
  • the UE when receiving the information indicating that the number of the DMRS CDM group is N from the BS and all the DMRS port indexes allocated to the UE are included in one DMRS CDM group, the UE transmits one or more PTs RS and receive the downlink signal including the PT-RS under the assumption that the power boosting level of the PT-RS based on the RS ports is 10 * log10N (dB).
  • the DMRS port index allocated to the UE is included in the different DMRS CDM group, and the QCL sources of the DMRS ports included in the different DMRS CDM groups are all
  • the same terminal can receive the downlink signal including the PT-RS on the assumption that the PT-RS is transmitted without power boosting based on one or more PT-RS ports associated with another DMRS CDM group. In this case, the terminal borrows power from another PT-RS port and does not expect the power of the PT-RS allocated to the terminal to be boosted.
  • the DMRS port index allocated to the MS is included in different DMRS CDM groups, and the QCLs of the DMRS ports included in the different DMRS CDM groups
  • the UE having a different Qausi-co-Located source does not have a PT-RS port transmitted from the base station to another terminal, and the number of PT-RS ports allocated to the terminal is two, can do.
  • the terminal borrows power from another PT-RS port and expects the power of the PT-RS to be boosted. In this case, it is valid only when the number of DL PT-RS ports is indicated by 2 or more in the TCI state to the terminal. If the number of DL PT-RS ports is 1 through the TCI state, the UE does not expect the power boosting.
  • the length of the OCC may be set equal to the number of PT-RS ports sharing a resource region for the PT-RS.
  • the number of PT-RS ports sharing a resource region for the PT-RS may be the same as the number of sub-carriers for which the PT-RS is received in one resource block.
  • a communication apparatus for receiving a downlink signal in a wireless communication system, the apparatus comprising: a memory; And a processor connected to the memory, wherein the processor receives information on a demodulation reference signal (DMRS) port index allocated to the terminal from the base station; And a phase tracking reference signal (PT-RS) transmitted over a plurality of sub-carriers for the allocated DMRS port index, the PT-RS being configured to receive an orthogonal cover code (OCC), and the OCC is determined based on the assigned DMRS port index.
  • DMRS demodulation reference signal
  • PT-RS phase tracking reference signal
  • a communication apparatus for transmitting a downlink signal in a wireless communication system, comprising: a memory; And a processor operatively connected to the memory, wherein the processor transmits information on a demodulation reference signal (DMRS) port index assigned to one or more terminals to the one or more terminals; And transmitting the downlink signal including the at least one terminal's phase tracking reference signal (PT-RS) to the at least one terminal, wherein the one or more terminal-specific PT- (OCC) associated with a plurality of subcarriers for an allocated DMRS port index, the OCC associated with each of the one or more UEs is based on a DMRS port index allocated to the one or more UEs And a communication device.
  • DMRS demodulation reference signal
  • PT-RS phase tracking reference signal
  • OCC terminal-specific PT-
  • the UE can receive a PT-RS from a Node B via a plurality of sub-carriers per resource block. Accordingly, the UE can more reliably measure the phase error (or phase noise) with respect to the base station.
  • the PT-RS is transmitted based on the OCC (or OCC is applied), so that the PT-RS collision between the terminals can be minimized.
  • the UE can recognize whether there is a PT-RS transmitted from a base station to another UE based on information on the number of DMRS CDM groups, and can receive a downlink signal have. That is, even if the transmission of the PT-RS for the other terminal is not informed through separate signaling, the terminal can indirectly know this.
  • the terminal may not assume that it is multiplexed with the same time and frequency resources as the other terminals.
  • the DMRS ports # 0, # 1, # 2, # 3, and # 11 may mean DMRS ports # 1000, # 1001, # 1002, #, # 1011 of the 3GPP NR standard.
  • 1 is a diagram for explaining a physical channel and a signal transmission method using the same.
  • FIG. 2 is a view showing a self-contained slot structure applicable to the present invention.
  • FIGS. 3 and 4 are views showing typical connection methods of the TXRU and the antenna element.
  • FIG. 5 is a simplified view of a hybrid beamforming structure in terms of TXRU and physical antennas according to an example of the present invention.
  • FIG. 6 is a diagram briefly illustrating a beam sweeping operation for a synchronization signal and system information in a downlink (DL) transmission process according to an exemplary embodiment of the present invention.
  • FIG. 7 is a diagram illustrating a time domain pattern of a PT-RS applicable to the present invention.
  • Figure 8 is a simplified representation of two types of DMRS settings applicable to the present invention.
  • FIG. 9 is a diagram simply showing an example of a front loaded DMRS of the first DMRS setting type applicable to the present invention.
  • FIGS. 10 to 13 are views showing various examples of Localized PT-RS according to the present invention.
  • FIG. 14 is a diagram illustrating an example of a distributed PT-RS according to an exemplary embodiment of the present invention.
  • FIG. 15 is a view for simply transmitting and receiving a downlink signal between a terminal and a base station according to an embodiment of the present invention.
  • FIG. 16 is a flowchart briefly illustrating an operation for receiving a downlink signal according to the present invention
  • 17 is a flowchart briefly illustrating an operation of transmitting a downlink signal by a base station according to the present invention.
  • FIG. 18 is a diagram showing a configuration of a terminal and a base station in which the proposed embodiments can be implemented.
  • each component or characteristic may be considered optional unless otherwise expressly stated.
  • Each component or feature may be implemented in a form that is not combined with other components or features.
  • some of the elements and / or features may be combined to form an embodiment of the present invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments.
  • the base station is meaningful as a terminal node of a network that directly communicates with a mobile station.
  • the specific operation described herein as performed by the base station may be performed by an upper node of the base station, as the case may be.
  • various operations performed for communication with a mobile station in a network consisting of a plurality of network nodes including a base station may be performed by a base station or other network nodes other than the base station.
  • the 'base station' may be replaced by a term such as a fixed station, a Node B, an eNode B, a gNode B, an Advanced Base Station (ABS), or an access point .
  • ABS Advanced Base Station
  • a terminal may be a user equipment (UE), a mobile station (MS), a subscriber station (SS), a mobile subscriber station (MSS) , A mobile terminal, or an advanced mobile station (AMS).
  • UE user equipment
  • MS mobile station
  • SS subscriber station
  • MSS mobile subscriber station
  • AMS advanced mobile station
  • the transmitting end refers to a fixed and / or mobile node providing data service or voice service
  • the receiving end means a fixed and / or mobile node receiving data service or voice service. Therefore, in the uplink, the mobile station may be the transmitting end and the base station may be the receiving end. Similarly, in a downlink, a mobile station may be a receiving end and a base station may be a transmitting end.
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of the following IEEE 802.xx systems, 3rd Generation Partnership Project (3GPP) systems, 3GPP LTE systems, 3GPP 5G NR systems, and 3GPP2 systems:
  • 3GPP 3rd Generation Partnership Project
  • 3GPP 3rd Generation Partnership Project
  • 3GPP LTE 3rd Generation Partnership Project
  • 3GPP 5G NR 3GPP 5G NR
  • 3GPP2 systems 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.321 and 3GPP TS 38.331. That is, self-explaining steps or parts not described in the embodiments of the present invention can be described with reference to the documents.
  • all terms disclosed in this document may be described by the standard document.
  • 3GPP NR system will be described as an example of a radio access system in which embodiments of the present invention can be used.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • single carrier frequency division multiple access And can be applied to various wireless connection systems.
  • embodiments of the present invention will be described mainly in 3GPP NR system.
  • the embodiment proposed in the present invention can be similarly applied to other wireless systems (e.g., 3GPP LTE, IEEE 802.16, IEEE 802.11, etc.).
  • a terminal receives information from a base station through a downlink (DL) and transmits information to a base station through an uplink (UL).
  • the information transmitted and received between the base station and the terminal includes general data information and various control information, and there are various physical channels depending on the type / use of the information transmitted / received.
  • FIG. 1 is a view for explaining physical channels that can be used in embodiments of the present invention and a signal transmission method using the same.
  • the terminal that is powered on again after power is turned off or a terminal that has entered a new cell performs an initial cell search operation such as synchronizing with the base station in step S11.
  • a mobile station receives a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from a base station, synchronizes with the base station, and acquires information such as a cell ID.
  • P-SCH primary synchronization channel
  • S-SCH secondary synchronization channel
  • the terminal can receive the physical broadcast channel (PBCH) signal from the base station and acquire the in-cell broadcast information.
  • PBCH physical broadcast channel
  • the UE can receive the downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state.
  • DL RS downlink reference signal
  • the UE Upon completion of the initial cell search, the UE receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to physical downlink control channel information in step S12, Specific system information can be obtained.
  • PDCCH physical downlink control channel
  • PDSCH physical downlink control channel
  • the terminal may perform a random access procedure such as steps S13 to S16 to complete the connection to the base station.
  • the UE transmits a preamble through a Physical Random Access Channel (PRACH) (S13), and transmits a RAR (preamble) to the preamble through the physical downlink control channel and the corresponding physical downlink shared channel Random Access Response) (S14).
  • PRACH Physical Random Access Channel
  • RAR preamble
  • the MS transmits a Physical Uplink Shared Channel (PUSCH) using the scheduling information in the RAR (S15), and receives a Physical Downlink Control Channel (PDCCH) signal and a corresponding Physical Downlink Shared Channel ) (S16).
  • PUSCH Physical Uplink Shared Channel
  • PDCCH Physical Downlink Control Channel
  • the UE having performed the procedure described above transmits a physical downlink control channel signal and / or physical downlink shared channel signal (S17) and a physical uplink shared channel (PUSCH: physical (S18) of an uplink shared channel (PUCCH) signal and / or a physical uplink control channel (PUCCH) signal.
  • S17 physical downlink control channel signal
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • the UCI includes HARQ-ACK / NACK (Hybrid Automatic Repeat and Acknowledgment / Negative ACK), SR (Scheduling Request), CQI (Channel Quality Indication), PMI (Precoding Matrix Indication), RI ) Information.
  • HARQ-ACK / NACK Hybrid Automatic Repeat and Acknowledgment / Negative ACK
  • SR Switching Request
  • CQI Channel Quality Indication
  • PMI Precoding Matrix Indication
  • RI Precoding Matrix Indication
  • the UCI is generally transmitted periodically via the PUCCH, but may be transmitted over the PUSCH according to an embodiment (e.g., when control information and traffic data are to be transmitted simultaneously). Also, according to a request / instruction of the network, the UE can periodically transmit the UCI through the PUSCH.
  • the ringing parameter and the cyclic prefix information for each carrier bandwidth part can be signaled for the downlink (DL) or uplink (UL), respectively.
  • the neighbors of the downlink carrier bandwidth part and cyclic prefix information may be signaled via higher layer signaling DL-BWP-mu and DL-MWP-cp .
  • the neighbors of the uplink carrier bandwidth part and the cyclic prefix information may be signaled via higher layer signaling UL-BWP-mu and UL-MWP-cp .
  • the downlink and uplink transmissions are composed of 10 ms long frames.
  • the frame may be composed of 10 sub-frames each having a length of 1 ms. At this time, the number of consecutive OFDM symbols for each subframe is to be.
  • Each frame may be composed of two half frames having the same size.
  • each half-frame may be composed of sub-frames 0 - 4 and 5 - 9, respectively.
  • the slots are arranged in ascending order within one sub-frame Are numbered in ascending order within one frame As shown in FIG.
  • the number of consecutive OFDM symbols in one slot ( ) Can be determined according to the cyclic prefix as shown in the following table.
  • a starting slot in one subframe ( ) Is the starting OFDM symbol ( )
  • Table 2 shows the number of OFDM symbols per slot / per frame / subframe for a normal cyclic prefix
  • Table 3 shows the number of OFDM symbols per slot / frame / subframe for an extended cyclic prefix. Represents the number of OFDM symbols per subframe.
  • a self-contained slot structure can be applied with the slot structure as described above.
  • FIG. 2 is a view showing a self-contained slot structure applicable to the present invention.
  • the base station and the UE can sequentially perform DL transmission and UL transmission in one slot, and can transmit and receive DL data in the one slot and transmit / receive UL ACK / NACK thereto.
  • this structure reduces the time it takes to retransmit data when a data transmission error occurs, thereby minimizing the delay in final data transmission.
  • a time gap of a certain time length is required for the base station and the UE to switch from the transmission mode to the reception mode or to switch from the reception mode to the transmission mode.
  • some OFDM symbols at the time of switching from DL to UL in the self-supporting slot structure may be set as a guard period (GP).
  • the self-supporting slot structure includes both the DL control region and the UL control region has been described, but the control regions may be selectively included in the self-supporting slot structure.
  • the self-supporting slot structure according to the present invention may include not only the DL control area and the UL control area but also the DL control area or the UL control area as shown in FIG.
  • a slot may have various slot formats.
  • the OFDM symbol of each slot can be classified into a downlink (denoted by 'D'), a flexible (denoted by 'X'), and an uplink (denoted by 'U').
  • the UE in the downlink slot, the UE generates downlink transmission only in 'D' and 'X' symbols. Similarly, in the uplink slot, the UE can assume that the uplink transmission occurs only in the 'U' and 'X' symbols.
  • the wavelength is short, and it is possible to install a plurality of antenna elements in the same area. That is, since the wavelength is 1 cm in the 30 GHz band, a total of 100 antenna elements can be provided when a 2-dimensional array is arranged at intervals of 0.5 lambda (wavelength) on a panel of 5 * 5 cm. Accordingly, in a millimeter wave (mmW), a plurality of antenna elements can be used to increase the beamforming (BF) gain to increase the coverage or increase the throughput.
  • BF beamforming
  • each antenna element may include TXRU (Transceiver Unit) so that transmission power and phase can be adjusted for each antenna element.
  • TXRU Transceiver Unit
  • each antenna element can perform independent beamforming for each frequency resource.
  • hybrid beamforming having B TXRUs that are fewer than Q antenna elements as an intermediate form of digital beamforming and analog beamforming can be considered.
  • the direction of a beam that can be transmitted at the same time may be limited to B or less.
  • FIGS. 3 and 4 are views showing typical connection methods of the TXRU and the antenna element.
  • the TXRU virtualization model shows the relationship between the output signal of the TXRU and the output signal of the antenna element.
  • FIG. 3 is a diagram illustrating a manner in which a TXRU is connected to a sub-array.
  • the antenna element is connected to only one TXRU.
  • FIG. 4 is a diagram illustrating a manner in which a TXRU is connected to all antenna elements.
  • the antenna element is connected to all TXRUs.
  • the antenna element requires a separate adder as shown in FIG. 4 to be connected to all TXRUs.
  • W represents a phase vector multiplied by an analog phase shifter. That is, W is a main parameter for determining the direction of the analog beamforming.
  • the mapping between the CSI-RS antenna port and the TXRUs may be 1: 1 or 1: to-many.
  • the analog beamforming (or RF (Radio Frequency) beamforming) means an operation of performing precoding (or combining) in the RF stage.
  • the baseband stage and the RF stage perform precoding (or combining), respectively. This has the advantage of achieving performance close to digital beamforming while reducing the number of RF chains and the number of digital-to-analog (or analog-to-digital) converters.
  • the hybrid beamforming structure may be represented by N transceiver units (TXRU) and M physical antennas.
  • TXRU transceiver units
  • the digital beamforming for the L data layers to be transmitted by the transmitting end may be represented by an N * L (N by L) matrix.
  • the converted N digital signals are then converted to an analog signal through a TXRU, and an analog beamforming represented by an M * N (M by N) matrix is applied to the converted signal.
  • FIG. 5 is a simplified view of a hybrid beamforming structure in terms of TXRU and physical antennas according to an example of the present invention.
  • the number of digital beams is L and the number of analog beams is N in FIG.
  • a base station is designed to change the analog beamforming in units of symbols, and a method of supporting more efficient beamforming to a terminal located in a specific area is considered.
  • the NR system according to the present invention includes a plurality of antenna panels to which independent hybrid beamforming is applicable To be introduced.
  • an analog beam advantageous for signal reception may be different for each terminal. Accordingly, in the NR system to which the present invention is applicable, the base station applies a different analog beam for each symbol within a specific slot (at least a synchronous signal, system information, paging, etc.) Beam sweeping operation is being considered to enable the beam sweeping.
  • FIG. 6 is a diagram briefly illustrating a beam sweeping operation for a synchronization signal and system information in a downlink (DL) transmission process according to an exemplary embodiment of the present invention.
  • xPBCH physical broadcast channel
  • a reference signal (reference signal) transmitted by applying a single analog beam (corresponding to a specific antenna panel) Beam RS, BRS
  • BRS Beam RS
  • the BRS may be defined for a plurality of antenna ports, and each antenna port of the BRS may correspond to a single analog beam.
  • the synchronization signal or the xPBCH can be transmitted by applying all the analog beams in the analog beam group so that an arbitrary terminal can receive it well.
  • phase noise associated with the present invention will be described.
  • the jitter on the time axis appears as phase noise on the frequency axis.
  • This phase noise randomly changes the phase of the received signal on the time axis as shown in the following equation.
  • Equation (1) The parameters represent the phase rotation due to the received signal, the time base signal, the frequency axis signal, and the phase noise, respectively.
  • Equation (2) the following Equation (2) is derived.
  • Equation (2) The parameters represent Common Phase Error (CPE) and Inter Cell Interference (ICI), respectively.
  • CPE Common Phase Error
  • ICI Inter Cell Interference
  • the UE estimates the CPE / CFO and removes the phase noise CPE / CFO on the frequency axis.
  • the process of estimating the CPE / CFO for the received signal by the UE must be performed in order to precisely decode the received signal.
  • the base station can transmit a predetermined signal to the terminal so that the terminal can accurately estimate the CPE / CFO.
  • This signal is a signal for estimating the phase noise, and may be a pilot signal shared in advance between the terminal and the base station And the data signal may be a changed or duplicated signal.
  • a series of signals for estimating phase noise are collectively referred to as a phase compensation reference signal (PCRS), a phase noise reference signal (PNRS), or a phase tracking reference signal (PT-RS).
  • PCRS phase compensation reference signal
  • PNRS phase noise reference signal
  • PT-RS phase tracking reference signal
  • FIG. 7 is a diagram illustrating a time domain pattern of a PT-RS applicable to the present invention.
  • the PT-RS may have a different pattern according to an applied modulation and coding scheme (MCS) level.
  • MCS modulation and coding scheme
  • the PT-RS can be mapped and transmitted in different patterns according to the applied MCS level.
  • the time domain pattern (or time density) of the PT-RS can be defined as shown in the following table.
  • time density 1 corresponds to Pattern # 1 in FIG. 7
  • time density 2 corresponds to Pattern # 2 in FIG. 7
  • time density 4 corresponds to Pattern # 3 in FIG.
  • the parameters ptrs-MCS1, ptrs-MCS2, ptrs-MCS3, ptrs-MCS4 constituting Table 5 can be defined by higher layer signaling.
  • the PT-RS according to the present invention can be mapped to one subcarrier per one RB (Resource Block), one subcarrier per two RBs, or one subcarrier per four RBs.
  • the frequency domain pattern (or frequency density) of the PT-RS may be set according to the size of the scheduled bandwidth.
  • it may have frequency densities as shown in Table 6 depending on the scheduled bandwidth.
  • the frequency density 1 corresponds to a frequency domain pattern in which the PT-RS is mapped to one subcarrier per 1 RB and transmitted, and the frequency density is 1/2, and the PT-RS is mapped to one subcarrier every two RBs, And a frequency density of 1/4 corresponds to a frequency domain pattern in which the PT-RS is mapped to one subcarrier every four RBs and transmitted.
  • the frequency domain pattern (or frequency density) of the PT-RS can be defined as shown in the following table.
  • the frequency density 2 corresponds to a frequency domain pattern in which the PT-RS is mapped to one subcarrier every two RBs
  • the frequency density 4 corresponds to a frequency at which the PT-RS is mapped to one subcarrier every four RBs, It can correspond to the area pattern.
  • N RB0 and N RB1 which are reference values of the scheduled bandwidth for determining the frequency density, can be defined by higher layer signaling.
  • the DMRS can be transmitted and received in a frond load structure.
  • an additional DMRS (additional DMRS) other than the DMRS to be transmitted may be additionally transmitted / received.
  • Front loaded DMRS can support fast decoding.
  • the first FODM symbol location may be indicated by a PBCH (Physical Broadcast Channel).
  • PBCH Physical Broadcast Channel
  • the number of OFDM symbols occupied by the front loaded DMRS can be indicated by a combination of DCI (Downlink Control Information) and RRC (Radio Resource Control) signaling.
  • DCI Downlink Control Information
  • RRC Radio Resource Control
  • Additional DMRS can be configured for high speed terminals.
  • the additional DMRS may be located in the middle / last symbol (s) in the slot. If one Front loaded DMRS symbol is set, the Additional DMRS can be assigned to 0 to 3 OFDM symbols. If two Front loaded DMRS symbols are set, the additional DMRS can be assigned to zero or two OFDM symbols.
  • a front loaded DMRS is composed of two types, one of which can be indicated via higher layer signaling (eg RRC signaling).
  • Figure 8 is a simplified representation of two types of DMRS settings applicable to the present invention.
  • P0 to P11 correspond to port numbers 1000 to 1011, respectively.
  • the DMRS setting type that is substantially set for the UE can be indicated by an upper layer signaling (e.g., RRC).
  • RRC upper layer signaling
  • the front loaded DMRS can be classified according to the number of OFDM symbols allocated as follows.
  • the number of OFDM symbols to which the first DMRS configuration type (DMRS configuration type 1) and the front loaded DMRS are allocated 1
  • Up to four ports may be multiplexed based on the length-2 F-Frequency-Code Division Multiplexing (CDM) and Frequency Division Multiplexing (FDM) methods.
  • CDM Frequency Division Multiplexing
  • FDM Frequency Division Multiplexing
  • the RS density can be set to 6 REs per port in the RB (Resource Block).
  • the number of OFDM symbols to which the first DMRS configuration type (DMRS configuration type 1) and the front loaded DMRS are allocated 2
  • Up to eight ports may be multiplexed based on length-2 F-CDM, length-2 T-Time-Code Division Multiplexing (CDM) and FDM methods.
  • the T-CDM can be fixed to [1 1].
  • the RS density can be set to 12 REs per port in RB.
  • the front loaded DMRS can be classified according to the number of OFDM symbols allocated as follows.
  • the number of OFDM symbols to which the second DMRS configuration type (DMRS configuration type 2) and the front loaded DMRS are allocated 1
  • Up to six ports may be multiplexed based on the length-2 F-CDM and FDM method.
  • the RS density can be set to 4 REs per port in the RB (Resource Block).
  • the number of OFDM symbols to which the second DMRS configuration type (DMRS configuration type 2) and the front loaded DMRS are allocated 2
  • Up to twelve ports may be multiplexed based on length-2 F-CDM, length-2 T-CDM and FDM methods.
  • the T-CDM can be fixed to [1 1].
  • the RS density can be set to 8 REs per port in RB.
  • FIG. 9 is a diagram simply showing an example of a front loaded DMRS of the first DM 0RS setting type applicable to the present invention.
  • DMRS denotes a structure with a front loaded DMRS with one symbol
  • FIG. 9 (b) shows a structure in which the DMRS is preceded by two symbols DMRS with two symbols.
  • DMRS ports having the same DELTA can be mutually divided into a code division multiplexing in the frequency domain (CDM-F) or a time division multiplexing in the time domain (CDM-T) . Also, DMRS ports with different delta can be CDM-F to each other.
  • the terminal can acquire the DMRS port setting information set by the base station through the DCI.
  • the DMRS port group may mean a set of DMRSs that are in a quasi co-located (QCL) or partial QCL (quasi co-located) relationship with each other.
  • QCL quasi co-located
  • the QCL relationship refers to a case where the long-term channel parameters such as Doppler spread and / or Doppler shift, average delay, and delay spread are the same .
  • a partial QCL relationship may mean that only some of the long-term channel parameters may be assumed to be the same.
  • FIG. 10 is a diagram simply showing an operation of a terminal transmitting and receiving signals to and from one base station as two groups of DMRS ports.
  • the terminal may include two panels.
  • one base station e.g., TRP (Transmission Reception Point), etc.
  • TRP Transmission Reception Point
  • each beam may correspond to one DMRS port group. This is because the DMRS ports defined for the different panels may not be QCLed from each other in terms of Doppler spread and / or Doppler shift.
  • the plurality of panels of the terminal may form one DMRS port group.
  • the UE can transmit different CWs (Codewords) for each DMRS port group.
  • one DMRS port group can transmit one or two CWs. More specifically, if the number of corresponding layers is 4 or less, one DMRS port group can transmit one CW, and if the number of corresponding layers is 5 or more, one DMRS port group can transmit two CWs. Also, different DMRS port groups may have different scheduled BWs.
  • all DMRS port groups may transmit one or two CWs. For example, if the total number of layers transmitted in two DMRS port groups is 4 or less, one CW is transmitted. If the total number of layers is 5 or more, two CWs can be transmitted.
  • the number of UL DMRS port groups can be set to the UE through SRS Resource Indication (SRI). For example, when the SRI sets two beams to the UE, the UE and the BS can consider that two DMRS port groups are set for the UE.
  • SRI SRS Resource Indication
  • the above configuration can be applied only to a codebook-based UL transmission.
  • the number of UL DMRS port groups may be set to the UE through the number of SRS resource sets. For example, when a plurality of SRIs belonging to two different SRS resource sets are set in the UE, the UE and the BS can consider that two DMRS port groups are set for the UE. According to an example of the present invention, the above configuration can be applied only to the case of non-codebook based UL transmission.
  • the NR system supports DCI format 0_0 and DCI format 0_1 in the DCI format for PUSCH scheduling, and DCI format 1_0 and DCI format 1_1 in the DCI format for PDSCH scheduling.
  • the NR system can additionally support DCI format 2_0, DCI format 2_1, DCI format 2_2, and DCI format 2_3.
  • DCI format 0_0 is used for scheduling TB (Transmission Block) based (or TB-level) PUSCH
  • DCI format 0_1 is used for TB (Transmission Block) (Or CBG-level) PUSCH if the base signal transmission / reception is set up.
  • DCI format 1_0 is used for scheduling TB-based (or TB-level) PDSCH
  • DCI format 1_1 is used for TB-based (or TB-level) PDSCH or CBG- based (or CBG- level PDSCH. < / RTI >
  • the DCI format 2 _ 0 is used for notifying the slot format
  • the DCI format 2 _ 1 is used for notifying the PRB and the OFDM symbol that a specific UE assumes that there is no intended signal transmission
  • the DCI format 2_2 is used for transmission of the TPC (Transmission Power Control) command of the PUCCH and the PUSCH
  • the DCI format 2_2 is used for transmission of the TPC (Transmission Power Control) command of the PUCCH and the PUSCH
  • the DCI format 2_3 may be used for the transmission of a TPC command group for SRS transmission by one or more UEs (used for the transmission of a group of TPC commands for SRS transmissions by one or more UEs).
  • DCI format can be supported by the 3GPP TS 38.212 document. That is, self-describing steps or parts not described in the DCI format related features may be described with reference to the document. In addition, all terms disclosed in this document may be described by the standard document.
  • the following two transmission schemes are supported for PUSCH: codebook based transmission and non-codebook based transmission.
  • txConfig in the upper layer parameter PUSCH-Config transmitted via higher layer signaling e.g., RRC signaling
  • codebook-based transmission may be established for the UE.
  • the rain for the UE if the higher layer parameters PUSCH-Config within txConfig is set to 'noncodebook' - can be codebook-based transmission setting.
  • the PUSH transmission triggered by a particular DCI format e.g., DCI format 0_0 as defined in 3GPP TS 38.211
  • a particular DCI format e.g., DCI format 0_0 as defined in 3GPP TS 38.211
  • the rank represents the same meaning as the number of layers.
  • the related technical features will be collectively referred to as the " number of layers " in the following description.
  • the beamforming accuracy may be impaired by phase noise.
  • the UE may perform non-coherent transmission through different panels.
  • each precoding matrix corresponds to a specific (physical) antenna
  • the column (vertical) of each precoding matrix can correspond to a specific layer.
  • every antenna can be mapped to a radio frequency (RF) chain by 1: 1 for each antenna.
  • the RF chain may refer to a processing block in which a single digital signal is converted into an analog signal.
  • coherent transmission may refer to an operation in which each layer (or data of each layer) transmits through all antennas based on a codebook.
  • a signal transmitted through each antenna may be generated in a baseband as follows.
  • 1/4 (X 1 + X 2 + X 3 + X 4 ) signals are generated and for the second antenna, 1/4 (X 1 - X 2 + X 3 - X 4 ) may be generated.
  • non-coherent transmission may mean an operation in which each layer (or data of each layer) transmits through a specific one of the antennas corresponding to the layer.
  • a signal transmitted through each antenna may be generated in a baseband as follows.
  • the RF chain connected to each antenna is a combination of several RF devices, each of which can generate inherent distortion (eg, phase shifting, amplitude attenuation).
  • a specific matrix (Corrupted Codebook) is added to express the contamination of the transmission signal through the RF chain. At this time, if there is no distortion, the matrix becomes the identity matrix.
  • the data X 1 should be transmitted in the vector direction [1 1 jj], but due to the distortion generated by the RF chain Direction. Therefore, the larger the value of? 1 ? 2 ,? 3 ,? 4 , the greater the signal transmission direction can be largely different from the originally desired direction.
  • Equation (6) when the distortion of the RF chain is large, a non-coherent transmission scheme that does not perform beamforming may be preferable as in Equation (6).
  • the codebook contaminated with distortion and the codebook not so distorted are simply e j ⁇ 1 , e j ⁇ 2 , e j ⁇ 3 , and e j ⁇ 4 .
  • this distortion can be corrected in the channel estimation.
  • the distortion of the RF chain is not large or the distortions caused by all RF chains are the same, it may be desirable to transmit the signal using a full-coherent codebook capable of digital beamforming.
  • partial coherent codebook with rank 4 (or partial coherent codebook for four layers)
  • the RF chain characteristics connected to antennas 1 and 3 are similar, so that the distortion they produce is the same . This relationship can be similarly applied to antennas # 2 and # 4.
  • the transmitter eg, 2 antennas & 4 antennas
  • TPMI index 1 or 2 in Table 14 the transmitter
  • the transmitter it is possible to transmit signals in a coherent transmission scheme, but in a non-coherent manner between antennas 1 and 2.
  • the UE may perform coherent combining.
  • MCS Modulation and Coding Scheme
  • phase noise is relatively dependent on the RF (Radio Frequency), and in the case of an expensive RF element, the phase noise may be very small.
  • the NR system applicable to the present invention can support both non-coherent / coherent transmission.
  • the UE determines a codebook subset based on the reception of a Transmitted Precoding Matrix Indicator (TPMI) and a codebookSubset in an upper layer signaling PUSCH-Config .
  • TPMI Transmitted Precoding Matrix Indicator
  • the codebookSubset may be set to one of 'fullAndPartialAndNonCoherent', 'partialAndNonCoherent', and 'nonCoherent' depending on the UE capability indicating the UE capable of supporting the codebook.
  • 'fullAndPartialAndNonCoherent' means that the UE can support both a full coherent codebook, a partial coherent codebook, and a non-coherent codebook, and 'partialAndNonCoherent' coherent codebook and non-coherent codebook, and 'nonCoherent' may mean that the UE can only support non-coherent codebook.
  • the maximum transmission rank (or the number of layers) applied to the codebook may be set by maxRank in the upper layer parameter PUSCH-Config .
  • the UE reporting the 'partialAndNonCoherent' transmission as its UE capability does not expect the codebook subset to be set to 'fullAndPartialAndNonCoherent'. Because reporting the 'partialAndNonCoherent' transmission as UE capability means that the UE does not support signaling based on a full coherent codebook, as described above, It may not expect a setting for signal transmission based on a coherent codebook (i.e., a codebook subset set to 'fullAndPartialAndNonCoherent').
  • the UE reporting its 'nonCoherent' transmission with its UE capability does not expect the codebook Subset to be set to 'fullAndPartialAndNonCoherent' or 'partialAndNonCoherent'.
  • CP-OFDM Cyclic Prefix-Orthogonal Frequency Division Multiplexing
  • DFT-s-OFDM Discrete Fourier Transform- Orthogonal Frequency Division Multiplexing
  • the UE uses the CP-OFDM waveform as the uplink waveform.
  • the UE uses the DFT-s-OFDM waveform as the uplink waveform.
  • the transform precoding is disabled for a specific UE or the transformed precoding is disabled when the specific UE is unable to apply the transform precoding.
  • the precoder W determined for the codebook-based transmission may be determined according to the following table based on the coefficients of the transport layer, the number of antenna ports, and the TPMI included in the DCI scheduling UL transmission.
  • Table 9 shows a precoding matrix W for single layer transmission using two antenna ports and Table 10 shows a precoding matrix W for single layer transmission using four antenna ports with transform precoding disabled .
  • Table 11 shows a precoding matrix W for two-layer transmission using two antenna ports with transform precoding disabled
  • Table 12 shows four precoding matrices W with four antenna ports with transform precoding disabled
  • Table 13 shows a precoding matrix W for three-layer transmission using four antenna ports with transform precoding disabled
  • Table 14 shows a precoding matrix W for three-layer transmission using transform And a precoding matrix W for four-layer transmission using four antenna ports with precoding disabled (with transform precoding disabled).
  • the UE may determine the PUSCH precoder and the transmission rank (or the number of layers) based on (wideband) SRI (sounding reference signal resource indicator).
  • SRI sounding reference signal resource indicator
  • the SRI may be provided through DCI or higher layer signaling.
  • the determined precoder may be an identity matrix.
  • a configuration in which a PT-RS is transmitted and received in a CDM (Code Division Multiplexing) manner on a frequency axis and a PT-RS transmitting and receiving method of the transmitting apparatus and the receiving apparatus for the same will be described in detail.
  • the configuration in which the PT-RS is CDM-transmitted / received is referred to as Localized PT-RS for convenience.
  • the configuration in which the PT-RS is transmitted and received without being CDM is referred to as a distributed PT-RS for the sake of convenience.
  • a Localized PT-RS is mapped to at least two subcarriers to which a corresponding (or associated) DMRS port per resource block (RB) is mapped, and the Distributed PT- Is mapped only to one subcarrier to which a corresponding (or associated with) DMRS port per RB is mapped.
  • the localized PT-RS frequency axis position in the RB can be determined based on the DMRS port position associated with the corresponding PT-RS.
  • the Localized PT-RS frequency axis position in the RB may be determined based on the CDM group including the DMRS port associated with the PT-RS.
  • FIG. 10 shows an example of a localized PT-RS according to an exemplary embodiment of the present invention.
  • PT-RS ports # 0 and # 1 are associated with DMRS ports # 0 and # 1.
  • the PT-RS port may be mapped to some frequency resources (for example, two sub-carrier resources) to which the associated DMRS port is mapped.
  • a configuration in which two PT-RS ports are associated with one CDM is referred to as a first type (or Type A) localized PT-RS.
  • FIG. 11 is a diagram illustrating an example of Localized PT-RS according to another example of the present invention.
  • PT-RS ports are bundled into one CDM (or associated with one CDM).
  • a configuration in which four PT-RS ports (or more than two PT-RS ports) are associated with one CDM is referred to as a second type (or Type B) localized PT- RS.
  • a localized PT-RS may mean any type of localized PT-RS described above, unless otherwise specified.
  • a plurality of Localized PT-RSs can be set for the base station or the terminal.
  • the plurality of localized PT-RSs may be set for each of a plurality of terminals that transmit and receive signals to or from the base station, or may be set for a specific terminal.
  • the location (in the RB) to which the plurality of localized PT-RSs are mapped can be set / determined the same for all RBs including the PT-RS.
  • FIG. 12 is a diagram illustrating an example of a Localized PT-RS according to another example of the present invention. As shown in FIG. 12, localized PT-RSs in RBs # 1 and # 3 may be mapped on the same frequency position (or subcarrier index).
  • the RB position (i.e., the RB to which the PT-RS is mapped) or the position in the RB (i.e., the sub-carrier to which the PT-RS in the specific RB is mapped) of the Localized PT- / RTI > can be determined / set on the basis of
  • the localized PT-RSs set in the same cell can be set / defined orthogonally for each UE.
  • localized PT-RSs between different cells can cause collisions.
  • such collision can be minimized.
  • the frequency location of the localized PT-RS can be defined / set for each BWP (Bandwidth Part).
  • the time density of the localized PT-RS according to the present invention can be set / applied similarly to the distributed PT-RS. That is, as shown in Table 5 and Fig. 7 and the like, the localized PT-RS can be determined based on the scheduled MCS.
  • localized PT-RS time densities can be indicated via higher layer signaling (eg RRC, MAC-CE). For example, if two different TRPs serve one terminal, the TRPs may each drop an independent DCI to the terminal. At this time, different PDSCHs scheduled by the two DCIs are transmitted to the same resource, and a unique PT-RS can be transmitted for each PDSCH. If the UE misses one of the two DCIs, the UE can not know the indicated MCS from the missing DCI and consequently can not know the PT-RS time density. Therefore, in this case, the PT-RS time density according to the MCS may be inappropriate.
  • RRC Radio Resource Control
  • the frequency density of the localized PT-RS according to the present invention can be set / applied similarly to the distributed PT-RS. That is, as shown in Table 7 and the like, the localized PT-RS can be set / defined as 1 / Q based on the scheduled bandwidth. In this case, 1 / Q may mean that one localized PT-RS is set / defined per Q RB.
  • a transmitting apparatus e.g., a base station or a terminal transmits a power boosting level based on the number of FDM (Frequency Division Multiplexed) To the PT-RS.
  • the DL / UL power boosting refers to transmission power of one layer (belonging to PDSCH / PUSCH) transmitted using a DMRS port having a relation with a PT-RS port by a transmitting apparatus Means increasing the transmission power of one DL / UL PT-RS port group.
  • the DL / UL PT-RS power boosting level is set to a value that indicates that the transmission power of one DL / UL PT-RS port group is transmitted (belonging to the PDSCH / PUSCH) using a DMRS port associated with the PT- It can indicate how high the transmission power of one layer is.
  • FIG. 13 is a diagram illustrating an example of a Localized PT-RS according to another example of the present invention.
  • PT-RS ports # 0 and # 1 constitute a localized PT-RS group # 0 and PT-RS ports # 2 and # 3 constitute a localized PT-RS group # 1.
  • the transmitting apparatuses transmitting the corresponding PT-RS through the localized PT-RS group # 0 (or localized PT-RS group # 1)
  • the PT-RS can be transmitted by boosting the power by 3 dB.
  • the power boosting operation can be applied only when two (localized) PT-RS groups are defined as shown in FIG.
  • PT-RS group # 0 (or PT-RS group # 1) is set for a specific transmitting apparatus and PT-RS group # 1 (or PT- 0) is not set, the total number of PT-RS groups set is 1, and the transmitting apparatus can transmit the PT-RS set (or scheduled) without power boosting.
  • the transmitting apparatus e.g., the base station or the terminal
  • the transmitting apparatus can perform power boosting by 4.77 dB through each PT-RS port group to transmit the corresponding PT-RS.
  • the power boosting operation can be applied only when three localized PT-RS groups are defined. In other words, when only two (or one) PT-RS port group among three PT-RS port groups are set based on the DMRS port setting type 2, the transmitting apparatus transmits 3 dB (or 0 dB ) To the power-boosted PT-RS.
  • the power boosting level described above may mean a maximum power boosting level through power borrowing from another PT-RS port group.
  • the power boosting level and / or the power boosting level may be separately signaled (e.g., higher layer signaling (e.g., Radio Resource Control (RRC), Medium Access Control- Downlink Control Information).
  • RRC Radio Resource Control
  • RRC Medium Access Control- Downlink Control Information
  • the terminal can indirectly determine whether the DL / UL PT-RS power is boosted and / or the power boosting level through signaling related to the DMRS port.
  • a description will be made in detail of a technique configuration applicable to the present invention based on the DMRS setting type 1.
  • the UE For example, if the UE recognizes that the number of CDM groups is one through the DMRS port information indicated to the UE, the UE only activates one localized PT-RS port group and deactivates another localized PT-RS port group Can be assumed. In this case, the terminal does not apply (or assume that it does not apply) power boosting to PT-RS port group # 0.
  • the terminal may also assume that a localized PT-RS port group other than the localized PT-RS port group connected to the allocated DMRS port is also activated. In other words, the terminal may assume that a localized PT-RS port group other than the localized PT-RS port group connected to the DMRS port allocated to the terminal is allocated to another terminal. In this case, the terminal can apply (or assume applicable) 3 dB power boosting to the assigned PT-RS port group.
  • the DMRS ports allocated to the UE belong to different CDM groups (e.g., DMRS ports # 0 and # 2) If the QCL sources of the DMRS ports are all the same, it is assumed that only the localized PT-RS port group connected to the allocated DMRS port is activated. In this case, the terminal does not apply (or assume that it does not apply) 3 dB power boosting to PT-RS port group # 0.
  • the DMRS ports allocated to the UE belong to different CDM groups (e.g., DMRS ports # 0 and # 2) If the QCL sources of the DMRS ports are not all the same, the UE may assume that only all localized PT-RS port groups are activated. In this case, the terminal can apply (or assume applicable) 3 dB power boosting for PT-RS port group # 0 / # 1.
  • a terminal can be configured with a specific type of DL / UL PT-RS via higher layer signaling or DCI received from a base station. More specifically, the terminal receives either one of a first type (or type A) localized PT-RS, a second type (or type B) localized PT-RS, and a distributed PT-RS via higher layer signaling or DCI received from the base station Can be set.
  • the terminal may establish one of a localized PT-RS or a distributed PT-RS via higher layer signaling or DCI from the base station and additionally transmit the higher layer signaling or DCI from the base station (when a localized PT- 1 type (or type A) localized PT-RS or a second type (or type B) localized PT-RS.
  • the OCC Orthogonal Cover Code
  • the OCC Orthogonal Cover Code applied to Localized PT-RS can be determined by the DMRS port index.
  • one localized PT-RS may comprise a plurality of PT-RS ports that are CDMs.
  • the base station needs to inform the terminal which OCC is used.
  • the DMRS port index can be allocated exclusively to the UE. Therefore, when mapping between the DMRS port index and the OCC, the OCCs set / assigned to the UEs may be different from each other.
  • the association (or mapping relationship) between the DMRS port index and the OCC can be set by upper layer signaling (eg, RRC, MAC-CE) or DCI.
  • upper layer signaling eg, RRC, MAC-CE
  • DCI DCI
  • the association between the DMRS port index and OCC can be established as shown in the following table.
  • the frequency position in the RB of the localized PT-RS port can be set by higher layer signaling or DCI.
  • the frequency position in the RB of the PT-RS is defined in association with the PT-RS port index and / or the DMRS port index and the CDM group associated therewith .
  • the base station transmits one of the subcarrier sets in the corresponding RB (e.g., ⁇ 0, 2 ⁇ , ..., May be set to the terminal through higher layer signaling or DCI.
  • DMRS port index PT-RS port index OCC Subcarrier within RB #0 #0 [1 1] ⁇ 0,2 ⁇ , ⁇ 2,4 ⁇ , ⁇ 4,6 ⁇ , ⁇ 6,8 ⁇ , ⁇ 8,10 ⁇ #One #One [1 -1] ⁇ 0,2 ⁇ , ⁇ 2,4 ⁇ , ⁇ 4,6 ⁇ , ⁇ 6,8 ⁇ , ⁇ 8,10 ⁇ #2 #2 [1 1] ⁇ 1,3 ⁇ , ⁇ 3,5 ⁇ , ⁇ 5,7 ⁇ , ⁇ 7,9 ⁇ , ⁇ 9,11 ⁇ # 3 # 3 [1 -1] ⁇ 1,3 ⁇ , ⁇ 3,5 ⁇ , ⁇ 5,7 ⁇ , ⁇ 7,9 ⁇ , ⁇ 9,11 ⁇
  • a terminal uses a DMRS table index and / or a DMRS port group and / or a DL / UL PT-RS number to determine a PT-RS port group other than the PT- Rate matching (or signal transmission / reception considering the different PT-RS port group).
  • the DMRS table can implicitly indicate not only one or more DMRS ports to be used by a specific terminal but also whether or not the DMRS ports not set by the specific terminal are occupied by other terminals. Accordingly, the UE can recognize the above information using the set DMRS table index. The UE determines whether rate matching (or transmission / reception of signals considering the different PT-RS port group) is performed for another PT-RS port group other than the PT-RS port group allocated to the UE based on the set DMRS table index And determine whether to power-up the PT-RS port group allocated to the UE.
  • the terminal may perform rate matching on the resource area in which the other terminal transmits / receives the PT-RS.
  • the DMRS table applicable to the invention of the present invention can be composed of a table showing the number of CDM groups and the associated DMRS ports as shown in one of the following Tables 17 to 20. At this time, value values of the following DMRS table can be provided through DCI.
  • the UE can determine that a DMRS port is defined only in the CDM group (e.g., CDM group # 0) allocated to the UE, For example, CDM group # 1). That is, the UE can indirectly confirm that the DMRS ports # 2 and # 3 are not used by the other UE through the DMRS table. In this case, the UE does not need to perform rate matching on resources defined / assigned to PT-RS port groups other than the PT-RS port group set for the UE. In other words, the terminal can assume that the other terminal does not use the localized PT_RS port # 1.
  • the UE when the number of CDM groups indicated by the DMRS table is 2, the UE not only has a CDM group (e.g., CDM group # 0) allocated to the UE but also a CDM group # 1), it can be assumed that a DMRS port is defined.
  • the terminal may assume that data is not transmitted from a CDM group (e.g., CDM group # 1) not allocated to the UE.
  • the UE can indirectly confirm that the DMRS ports # 2 (and # 3) are used by another UE through the DMRS table.
  • the terminal can perform rate matching on resources defined / allocated to a PT-RS port group other than the PT-RS port group set for the terminal.
  • the terminal can assume that the other terminal uses the localized PT_RS port # 1.
  • the specific terminal when the specific terminal has been allocated the DMRS ports # 0, 1, 2, 3 and the DMRS ports constitute one DMRS port group (for example, the DMRS ports have the same QCL source, port group), or if the number of DL / UL PT-RS ports is one, the specific terminal may not perform rate matching on a resource defined by the PT-RS port group # 1. This is because resources defined in other PT-RS port group # 1 are not used by other terminals.
  • the DMRS ports when the DMRS ports constitute two DMRS port groups (for example, DMRS ports # 0 and # 1 have the same QCL source and DMRS ports # 2 and # 3 have the same QCL source, # 0 and # 2 have different QCL sources.
  • DMRS ports # 0 and # 2 are set to the UE, two DMRS port groups can be defined), (localized) PT-RS group # 0 / # 1 can be activated, so that the specific terminal can perform rate matching on the resource defined by the PT-RS port group # 1.
  • the operation of the terminal based on the DMRS table described above can be similarly applied not only to the localized PT-RS but also to the distributed PT-RS.
  • FIG. 14 is a diagram illustrating an example of a distributed PT-RS according to an exemplary embodiment of the present invention.
  • port # 14 if the terminal has been allocated DMRS ports # 0 and # 1 and recognizes that the DMRS ports # 2 and / or # 3 are occupied by other terminals (via the DMRS table) port # 2, and port # 3 may perform rate matching on the defined resource.
  • the rate matching of the terminal can be set by the upper layer signaling of the base station. If the rate matching of the terminal is set to 'OFF' by the base station, the terminal does not always perform rate matching with respect to resources defined in another PT-RS port group, unlike the above-described operation. On the other hand, when the rate matching of the terminal is set to 'ON' by the base station, the terminal determines whether the other PT-RS port group is used by the other terminal as in the above- group can selectively perform rate matching for the defined resource.
  • FIG. 15 is a view for simply transmitting and receiving a downlink signal between a terminal and a base station according to an embodiment of the present invention.
  • FIG. 16 is a flowchart briefly illustrating an operation for receiving a downlink signal according to the present invention
  • 17 is a flowchart briefly illustrating an operation of transmitting a downlink signal by a base station according to the present invention.
  • a terminal receives information on a demodulation reference signal (DMRS) port index allocated to the terminal (or related to the terminal) from the base station (S1510, S1610).
  • the base station transmits information on the DMRS port index allocated to one or more terminals (or related to one or more terminals) to each terminal (S1510, S1710).
  • DMRS demodulation reference signal
  • the terminal may receive information on the number of DMRS code division multiplexing (CDM) groups associated with the terminal from the base station (S1520, S1620).
  • the base station may transmit information on the number of associated DMRS CDM groups for each of at least one terminal (S1520, S1720).
  • the terminal can confirm / determine various information for receiving the downlink signal based on the information received through S1510 (or S1610) or the information received through S1510 (or S1610) and S1520 (or S1620).
  • the UE may determine, based on the information, a resource region in which the PT-RS is received, an Orthogonal Cover Code (OCC) for the PT-RS, a power boosting level of the PT- Whether or not the PT-RS is transmitted to another terminal, and the like.
  • OCC Orthogonal Cover Code
  • a terminal receives the downlink signal including a phase tracking reference signal (PT-RS) transmitted through a plurality of sub-carriers for a DMRS port index allocated to the terminal (S1540, S1640 ).
  • the base station transmits the downlink signal including the at least one terminal-specific PT-RS to the one or more terminals (S1540 and S1740).
  • PT-RS phase tracking reference signal
  • the terminal receives the PT-RS based on the OCC for the PT-RS.
  • the OCC can be determined based on the DMRS port index allocated to the UE.
  • the UE can receive the PT-RS through one resource block for two or four consecutive resource blocks.
  • the UE can receive a PT-RS through a plurality of second resource blocks spaced at a predetermined interval from among a plurality of consecutive first resource blocks.
  • a resource block in which the PT-RS is transmitted for each of the two (or four) consecutive resource blocks of the second resource blocks among the plurality of consecutive first resource blocks May be determined based on at least one of a physical cell identifier, a virtual cell identifier, or information indicated by upper layer signaling set to the terminal.
  • the position of a plurality of sub-carriers in which the PT-RS is received in one of the second resource blocks may be determined based on a demodulation reference signal port index allocated to the UE from the BS.
  • the location of a plurality of sub-carriers in which the PT-RS is received in one of the second resource blocks may be determined based on a demodulation reference signal port index allocated to the UE from the BS, a physical cell identifier, Terminal identifiers, or information indicated by higher layer signaling.
  • the UE determines whether there is a PT-RS transmitted to another UE based on at least one of the number of DMRS CDM groups associated with the UE and the DMRS port index allocated to the UE, RS of the transmitted PT-RS, and receive the downlink signal including the PT-RS based on the determination.
  • the MS receiving the information indicating that the number of the DMRS CDM group is 1 from the BS can receive the downlink signal on the assumption that there is no PT-RS transmitted from the BS to another MS. More specifically, assuming that there is no PT-RS transmitted from the BS to another MS, the MS receiving the downlink signal transmits data in the resource area for the PT-RS of the DMRS CDM group not associated with the MS It is possible to receive the downlink signal.
  • the terminal determines whether the PT-RS is in a state of being connected to the DMRS CDM group RS, the PT-RS, and the PT-RS.
  • one or more PT-RS ports associated with a DMRS CDM group not associated with the MS may include a DMRS CDM group including a DMRS port having a PT-RS assigned to the MS, And may be one or more PT-RS ports associated with DMRS ports included in different DMRS CDM groups.
  • the association may mean that the frequency location for the corresponding PT-RS port and the precoding matrix are determined by the frequency position and the precoding matrix for the associated DMRS port.
  • the MS when receiving information indicating that a plurality of DMRS CDM groups are received from the BS and all the DMRS port indices allocated to the MS are included in one CDM group, the MS transmits PT-RS
  • the downlink signal can be received. More specifically, the terminal receiving the downlink signal on the assumption that there is a PT-RS transmitted from the base station to another terminal transmits one or more PT-RSs having an association with one or more DMRS CDM groups not associated with the terminal, It is possible to receive the downlink signal on the assumption that data is not transmitted in the resource region for RS.
  • the UE when receiving the information indicating that the number of the DMRS CDM group is N from the BS and all the DMRS port indexes allocated to the UE are included in one DMRS CDM group, the UE transmits one or more PTs RS and receive the downlink signal including the PT-RS under the assumption that the power boosting level of the PT-RS based on the RS ports is 10 * log10N (dB).
  • the MS may receive the downlink signal on the assumption that data is transmitted in a resource region for a PT-RS associated with one or more DMRS CDM groups not associated with the MS.
  • the DMRS port index allocated to the UE is included in different DMRS CDM groups, and the QCL sources of the DMRS ports included in the different DMRS CDM groups are all
  • the same terminal can receive the downlink signal including the PT-RS on the assumption that the PT-RS is transmitted without power boosting based on one or more PT-RS ports associated with another DMRS CDM group.
  • the DMRS port index assigned to the UE is included in a different DMRS CDM group and the QCL source of the DMRS ports included in the different DMRS CDM group
  • the UE can receive the downlink signal on the assumption that there is no PT-RS transmitted from the BS to another UE.
  • the MS can receive the downlink signal including the PT-RS on the assumption that the PT-RS is power-boosted and transmitted. If the total number of PT-RSs indicated from the BS is one, the MS expects the PT-RS to be transmitted without power boosting based on one or more PT-RS ports associated with another DMRS CDM group.
  • the length of the OCC may be set equal to the number of PT-RS ports sharing a resource region for the PT-RS.
  • the number of PT-RS ports sharing a resource region for the PT-RS may be the same as the number of sub-carriers for which the PT-RS is received in one resource block.
  • examples of the proposed method described above can also be included as one of the implementing methods of the present invention, and thus can be considered as a kind of proposed methods.
  • the proposed schemes described above may be implemented independently, but may be implemented in a combination (or merging) of some of the proposed schemes.
  • a rule may be defined such that the base station informs the terminal of the information on whether or not to apply the proposed methods (or information on the rules of the proposed methods) through a predefined signal (e.g., a physical layer signal or an upper layer signal) have.
  • FIG. 18 is a diagram showing a configuration of a terminal and a base station in which the proposed embodiment can be implemented.
  • the terminal and the base station shown in FIG. 18 operate to implement the above-described embodiments of the downlink signal transmission / reception method between the terminal and the base station.
  • a user equipment (UE) 1 can operate as a transmitter in an uplink and as a receiver in a downlink. Also, the base station (eNB or gNB, 100) can operate as a receiving end in the uplink and as a transmitting end in the downlink.
  • eNB or gNB, 100 can operate as a receiving end in the uplink and as a transmitting end in the downlink.
  • the terminal and the base station may each include a transmitter (Transmitter 10, 110) and a receiver (Receiver 20, 120) for controlling transmission and reception of information, data and / Or antennas 30 and 130 for transmitting and receiving messages, and the like.
  • a transmitter Transmitter 10, 110
  • a receiver Receiveiver 20, 120
  • the terminal and the base station each include a processor (Processor) 40, 140 for performing the above-described embodiments of the present invention.
  • the processor 40, 140 may be configured to control the memory 50, 150 and / or the transmitter 10, 110 and / or the receiver 20, 120 to implement the procedures / methods and / .
  • the processor 40, 140 includes a communication modem designed to implement wireless communication technology (e.g., LTE, NR).
  • the memories 50 and 150 are connected to the processors 40 and 140 and store various information related to the operation of the processors 40 and 140.
  • the memory 50, 150 may be implemented with software code (e.g., code) that includes instructions for performing some or all of the processes controlled by the processor 40, 140 or for performing the procedures and / Can be stored.
  • Transmitter 10, 110 and / or receiver 20, 120 are coupled to processor 40, 140 and transmit and / or receive wireless signals.
  • processors 40 and 140 and memories 50 and 150 may be part of a processing chip (e.g., System on a Chip, SoC).
  • the terminal 1 or the communication device included in the terminal receives the information on the demodulation reference signal (DMRS) port index allocated to the terminal from the base station and transmits the allocated DMRS port index And a phase tracking reference signal (PT-RS) transmitted through a plurality of subcarriers for the downlink signal.
  • DMRS demodulation reference signal
  • PT-RS phase tracking reference signal
  • the PT-RS is received based on an Orthogonal Cover Code (OCC), and the OCC can be determined based on the allocated DMRS port index.
  • OCC Orthogonal Cover Code
  • the base station 100 or the communication device included in the base station transmits information on a demodulation reference signal (DMRS) port index allocated to one or more terminals to the one or more terminals, And transmits the downlink signal including the at least one terminal's phase tracking reference signal (PT-RS) to the terminal.
  • DMRS demodulation reference signal
  • PT-RS phase tracking reference signal
  • the at least one terminal-specific PT-RS is transmitted based on an associated orthogonal cover code (OCC) through a plurality of sub-carriers for a DMRS port index allocated to the associated terminal,
  • OCC orthogonal cover code
  • the associated OCC may be determined based on the DMRS port index assigned to each of the one or more terminals.
  • a transmitter and a receiver included in a terminal and a base station can perform a packet modulation and demodulation function for data transmission, a fast packet channel coding function, an orthogonal frequency division multiple access (OFDMA) packet scheduling, a time division duplex (TDD) Packet scheduling and / or channel multiplexing functions.
  • the terminal and the base station of FIG. 18 may further include a low-power RF (Radio Frequency) / IF (Intermediate Frequency) unit.
  • a personal digital assistant PDA
  • a cellular phone a personal communication service (PCS) phone
  • a global system for mobile (GSM) phone a wideband CDMA
  • GSM global system for mobile
  • MM multi-mode multi-band
  • the smart phone is a terminal that combines the advantages of a mobile communication terminal and a personal portable terminal, and may mean a terminal that integrates data communication functions such as calendar management, fax transmission / reception, and Internet access, have.
  • the multimode multiband terminal can operate both in a portable Internet system and other mobile communication systems (for example, Code Division Multiple Access (CDMA) 2000 system, WCDMA (Wideband CDMA) system, etc.) .
  • CDMA Code Division Multiple Access
  • WCDMA Wideband CDMA
  • Embodiments of the present invention may be implemented by various means.
  • embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
  • the method according to embodiments of the present invention may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) Field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs Field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • the method according to embodiments of the present invention may be implemented in the form of a module, a procedure, or a function for performing the functions or operations described above.
  • the software code may be stored in the memory units 50, 150 and driven by the processor 40, 140.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various means already known.
  • Embodiments of the present invention can be applied to various radio access systems.
  • various wireless access systems include 3GPP (3rd Generation Partnership Project) or 3GPP2 system.
  • the embodiments of the present invention can be applied not only to the various wireless access systems described above, but also to all technical fields applying the various wireless access systems.
  • the proposed method can be applied to a mmWave communication system using a very high frequency band.

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

Abstract

L'invention concerne un procédé d'émission ou de réception d'un signal de liaison descendante entre un terminal et une station de base dans un système de communication sans fil, et un dispositif le prenant en charge. Selon un mode de réalisation applicable à la présente invention, un terminal peut recevoir un signal de liaison descendante comprenant un signal de référence de suivi de phase (PTRS) transmis par l'intermédiaire de multiples sous-porteuses pour un indice de port de signal de référence de démodulation (DMRS) attribué au terminal. Ici, le terminal peut recevoir le PTRS, à l'aide d'un code de couverture orthogonal (OCC) déterminé sur la base de l'indice de port DMRS attribué au terminal.
PCT/KR2018/014609 2017-11-24 2018-11-26 Procédé d'émission ou de réception de signal de liaison descendante entre un terminal et une station de base dans un système de communication sans fil, et appareil prenant en charge celui-ci WO2019103550A1 (fr)

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CN114503496A (zh) * 2019-10-03 2022-05-13 Lg 电子株式会社 在无线通信系统中发送和接收相位跟踪参考信号的方法及其装置
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Cited By (8)

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Publication number Priority date Publication date Assignee Title
CN114503496A (zh) * 2019-10-03 2022-05-13 Lg 电子株式会社 在无线通信系统中发送和接收相位跟踪参考信号的方法及其装置
CN114503496B (zh) * 2019-10-03 2024-02-27 Lg 电子株式会社 在无线通信系统中发送和接收相位跟踪参考信号的方法及其装置
WO2021139550A1 (fr) * 2020-01-07 2021-07-15 Shanghai Langbo Communication Technology Company Limited Procédé et dispositif dans un nœud utilisés pour la communication sans fil
CN113162736A (zh) * 2020-01-07 2021-07-23 上海朗帛通信技术有限公司 一种被用于无线通信的节点中的方法和装置
CN113162736B (zh) * 2020-01-07 2022-10-18 上海朗帛通信技术有限公司 一种被用于无线通信的节点中的方法和装置
US11818059B2 (en) 2020-01-07 2023-11-14 Shanghai Langbo Communication Technology Company Limited Method and device in a node used for wireless communication
WO2023160320A1 (fr) * 2022-02-23 2023-08-31 上海推络通信科技合伙企业(有限合伙) Procédé et appareil utilisés dans un nœud pour des communications sans fil
WO2024027093A1 (fr) * 2022-08-05 2024-02-08 中国电信股份有限公司 Procédé, appareil, et système de traitement de collision de signal, support, et dispositif électronique

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