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WO2025143345A1 - Procédé et appareil de réception d'un signal de référence de liaison descendante dans un système de communication sans fil - Google Patents

Procédé et appareil de réception d'un signal de référence de liaison descendante dans un système de communication sans fil Download PDF

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Publication number
WO2025143345A1
WO2025143345A1 PCT/KR2024/001182 KR2024001182W WO2025143345A1 WO 2025143345 A1 WO2025143345 A1 WO 2025143345A1 KR 2024001182 W KR2024001182 W KR 2024001182W WO 2025143345 A1 WO2025143345 A1 WO 2025143345A1
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WIPO (PCT)
Prior art keywords
dmrs
terminal
groups
information
base station
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English (en)
Korean (ko)
Inventor
정우재
이승현
정건웅
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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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
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H04W72/232—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the physical layer, e.g. DCI signalling

Definitions

  • terahertz bands e.g., 95 gigahertz (GHz) to 3 terahertz (THz) bands.
  • GHz gigahertz
  • THz terahertz
  • the terahertz band is expected to have more serious path loss and atmospheric absorption phenomena, and thus the importance of technologies that can guarantee signal reach, or coverage, is expected to increase.
  • 6G communication systems are being developed with full duplex technology that allows uplink (terminal transmission) and downlink (base station transmission) to utilize the same frequency resources at the same time; network technology that comprehensively utilizes satellites and HAPS (High-altitude Platform Stations); network structure innovation technology that supports mobile base stations and enables optimization and automation of network operation; dynamic spectrum sharing technology through collision avoidance based on spectrum usage prediction; AI-based communication technology that utilizes AI from the technology design stage and embeds end-to-end AI support functions to realize system optimization; and next-generation distributed computing technology that realizes services with complexity that exceeds the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources (MEC, cloud, etc.).
  • MEC ultra-high-performance communication and computing resources
  • 6G communication systems will enable a new dimension of hyper-connected experience (The Next Hyper-Connected Experience) through the hyper-connectivity of 6G communication systems that includes not only connections between things but also connections between people and things.
  • 6G communication systems will enable the provision of services such as truly immersive XR, high-fidelity mobile hologram, and digital replica.
  • services such as remote surgery, industrial automation, and emergency response through enhanced security and reliability will be provided through 6G communication systems, which will be applied in various fields such as industry, medicine, automobiles, and home appliances.
  • the conventional technique of allocating a UL grant only to one HARQ (hybrid automatic repeat and request) process may cause additional delay time when the UL transmission period and the UL traffic arrival period are similar.
  • various technologies for uplink transmission and retransmission are being considered.
  • the present disclosure seeks to provide a device and method capable of performing effective signal transmission and reception in a wireless communication system.
  • the present disclosure provides a device and method for reducing overhead for downlink reference signal transmission.
  • a method performed by a user equipment (UE) in a wireless communication system comprising: providing information related to a reception antenna port of the UE to a base station; transmitting capability information including information on a maximum number of demodulation reference signal (DMRS) groups that the UE can support to the base station; receiving, from the base station, configuration information including information on a number of DMRS groups configured for the UE; and receiving, from the base station, at least one DMRS corresponding to a number of DMRS groups based on the configuration information through different reception antenna ports of the UE, each of which is associated with a DMRS group, wherein DMRS ports having the same or different port indices assigned to each of the DMRS groups are configured, and different initialization sequences for generating a DMRS sequence can be applied to each of the DMRS groups.
  • DMRS demodulation reference signal
  • a method performed by a base station in a wireless communication system comprising: receiving information related to a reception antenna port of a terminal from the terminal; receiving capability information including information on a maximum number of demodulation reference signal (DMRS) groups that the terminal can support from the terminal; transmitting, to the terminal, configuration information including information on a number of DMRS groups configured for the terminal; and transmitting, to the terminal, at least one DMRS corresponding to the number of DMRS groups based on the configuration information, wherein each of the DMRS groups is associated with a different reception antenna port of the terminal, and DMRS ports having the same or different port indices assigned to each of the DMRS groups are configured, and different initialization sequences for generating a DMRS sequence can be applied to each of the DMRS groups.
  • DMRS demodulation reference signal
  • a user equipment in a wireless communication system, includes: a transceiver; and a controller connected to the transceiver, wherein the controller is configured to perform the steps of: providing information related to a reception antenna port of the UE to a base station; transmitting capability information including information on a maximum number of demodulation reference signal (DMRS) groups that the UE can support to the base station; receiving, from the base station, configuration information including information on a number of DMRS groups configured for the UE; and receiving, from the base station, at least one DMRS corresponding to the number of DMRS groups based on the configuration information through different reception antenna ports of the UE, each of which is associated with the DMRS group, wherein DMRS ports having the same or different port indices assigned thereto are configured, and different initialization sequences for generating a DMRS sequence can be applied to each of the DMRS groups.
  • DMRS demodulation reference signal
  • a base station comprises: a transceiver; and a controller connected to the transceiver, wherein the controller is configured to perform the steps of: receiving information related to a reception antenna port of a terminal from the terminal; receiving capability information including information on a maximum number of demodulation reference signal (DMRS) groups that the terminal can support from the terminal; transmitting, to the terminal, configuration information including information on a number of DMRS groups configured for the terminal; and transmitting, to the terminal, at least one DMRS corresponding to the number of DMRS groups based on the configuration information, wherein each of the DMRS groups is associated with a different reception antenna port of the terminal, and DMRS ports having the same or different port indices assigned to each of the DMRS groups are configured, and different initialization sequences for generating a DMRS sequence can be applied to each of the DMRS groups.
  • DMRS demodulation reference signal
  • the present disclosure provides a device and method capable of effectively providing a service in a wireless communication system.
  • the present disclosure provides a device and method capable of performing effective signal transmission and reception in a wireless communication system.
  • FIG. 1 illustrates a wireless environment network in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 2 illustrates a functional configuration of a base station in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 3 illustrates a functional configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 4 illustrates an example of a wireless resource region in a wireless communication system according to embodiments of the present disclosure.
  • FIG. 5 is a diagram showing an example of a DMRS pattern configuration according to various embodiments of the present disclosure.
  • FIG. 6 is a diagram illustrating an example of mapping a DMRS to a resource element grid according to various embodiments of the present disclosure.
  • FIG. 7 is a diagram illustrating an example of DMRS port allocation according to various embodiments of the present disclosure.
  • FIG. 8 is a diagram illustrating an example of a DMRS port pattern configuration for allocating more than 8 layers to a single terminal according to various embodiments of the present disclosure.
  • FIG. 9 is a diagram showing an antenna configuration of a base station of an eXtreme-MIMO system according to various embodiments of the present disclosure.
  • FIG. 10 is a diagram illustrating an example of a DMRS port group and a terminal receiving antenna port configuration associated with the DMRS port group according to various embodiments of the present disclosure.
  • FIG. 11 is a diagram illustrating an example of non-orthogonal DMRS port allocation for a single terminal according to various embodiments of the present disclosure.
  • FIG. 12 and FIG. 13 are diagrams showing an example of an operation in which a terminal transmits information about a channel for each receiving antenna port of the terminal to a base station according to various embodiments of the present disclosure.
  • FIG. 14 and FIG. 15 are diagrams showing an example of a configuration of an association relationship between a terminal receiving antenna port and a non-orthogonal DMRS group operated at a base station according to various embodiments of the present disclosure.
  • FIG. 16 is a diagram illustrating an example of a method for indicating a DMRS scrambling ID required for generating a DMRS sequence to be used for non-orthogonal DMRS groups according to various embodiments of the present disclosure.
  • FIG. 17 is a diagram illustrating another example of a method for indicating a DMRS scrambling ID required for generating a DMRS sequence to be used for non-orthogonal DMRS groups according to various embodiments of the present disclosure.
  • FIGS. 18 to 21 are diagrams illustrating examples of a method for indicating a non-orthogonal DMRS port to a terminal using an antenna port(s) field of downlink control information (DCI) according to various embodiments of the present disclosure.
  • DCI downlink control information
  • FIGS. 22 to 25 are diagrams illustrating further examples of a method for indicating a non-orthogonal DMRS port to a terminal using an antenna port(s) field of downlink control information (DCI) according to various embodiments of the present disclosure.
  • DCI downlink control information
  • FIG. 26 is a diagram illustrating another example of a method for indicating a non-orthogonal DMRS port to a terminal using an antenna port(s) field of downlink control information (DCI) according to various embodiments of the present disclosure.
  • DCI downlink control information
  • FIG. 27 is a diagram illustrating an example of a downlink non-orthogonal DMRS reception operation of a terminal according to various embodiments of the present disclosure.
  • FIG. 28 is a diagram illustrating another example of a downlink non-orthogonal DMRS reception operation of a terminal according to various embodiments of the present disclosure.
  • FIG. 29 is a flowchart illustrating an example of a method of operating a terminal according to various embodiments of the present disclosure.
  • FIG. 30 is a flowchart illustrating an example of a method of operating a base station according to various embodiments of the present disclosure.
  • expressions of more than or less than may be used to determine whether a specific condition is satisfied or fulfilled, but this is only a description for expressing an example and does not exclude descriptions of more than or less than.
  • a condition described as ‘more than’ may be replaced with ‘more than’
  • a condition described as ‘less than’ may be replaced with ‘less than’
  • a condition described as ‘more than and less than’ may be replaced with ‘more than and less than’.
  • 5G systems must support services that simultaneously satisfy various requirements so that they can freely reflect the diverse needs of users and service providers.
  • Services considered for 5G systems include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), or ultra-reliable and low-latency communication (URLLC).
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communication
  • URLLC ultra-reliable and low-latency communication
  • eMBB aims to provide a data transmission rate that is higher than that supported by existing LTE, LTE-A or LTE-Pro.
  • eMBB should be able to provide a peak data rate of 20 Gbps in the downlink and a peak data rate of 10 Gbps in the uplink from the perspective of a single base station.
  • the 5G system should provide an increased user perceived data rate while providing the peak data rate.
  • improvements in various transmission/reception technologies including further improved multi-input multi-output (MIMO) transmission technology, may be required.
  • MIMO multi-input multi-output
  • a 5G system can satisfy the data transmission rate required by the 5G communication system by using a wider frequency bandwidth than 20 MHz in the frequency band of 3 to 6 GHz or higher than 6 GHz.
  • mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G systems.
  • IoT Internet of Things
  • mMTC requires support for mass terminal connection, improved terminal coverage, improved battery life, and reduced terminal cost in order to efficiently provide the Internet of Things. Since the Internet of Things provides communication functions by attaching various sensors and various devices, it must be able to support a large number of terminals (e.g., 1,000,000 terminals/km2) in a cell.
  • terminals supporting mMTC are likely to be located in shadow areas that cells do not cover, such as basements of buildings, due to the nature of the service, and therefore require wider coverage than other services provided by 5G communication systems.
  • Terminals supporting mMTC must be composed of low-cost terminals, and since it is difficult to frequently replace the terminal batteries, they require very long battery life times, such as 10 to 16 years.
  • URLLC is a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, services used for remote control of robots or machinery, industrial automation, unmanaged aerial vehicles, remote health care, or emergency alert can be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds, and at the same time, satisfy the requirement of a packet error rate of less than 10-5. Therefore, for a service supporting URLLC, the 5G system must provide a smaller transmit time interval (TTI) than other services, and at the same time, allocate wide resources in the frequency band to secure the reliability of the communication link.
  • TTI transmit time interval
  • data traffic of the three services mentioned above namely eMBB, URLLC, and mMTC services
  • eMBB enhanced mobile broadband
  • URLLC ultra-reliable and low-latency communications
  • mMTC massive machine type communications
  • FIG. 1 illustrates a wireless environment network in a wireless communication system according to various embodiments of the present disclosure.
  • FIG. 1 illustrates a base station (110), a first terminal (120), and a second terminal (130) as some of the nodes that utilize a wireless channel in the wireless communication system.
  • FIG. 1 illustrates only one base station, but other base stations identical to or similar to the base station (110) may be further included.
  • the base station (110) is a network infrastructure that provides wireless access to terminals (120, 130).
  • the base station (110) has coverage defined as a certain geographical area based on the distance over which a signal can be transmitted.
  • the base station (110) may be referred to as an 'access point (AP)', 'eNodeB (eNB)', '5 th generation node', 'next generation nodeB (gNB)', 'wireless point', 'transmission/reception point (TRP)' or other terms having equivalent technical meanings.
  • Each of the first terminal (120) and the second terminal (130) is a device used by a user and performs communication with the base station (110) via a wireless channel. In some cases, at least one of the first terminal (120) and the second terminal (130) may be operated without the involvement of the user. That is, at least one of the first terminal (120) and the second terminal (130) is a device that performs machine type communication (MTC) and may not be carried by the user.
  • MTC machine type communication
  • Each of the first terminal (120) and the second terminal (130) may be referred to as a ‘user equipment (UE)’, a ‘mobile station’, a ‘subscriber station’, a ‘remote terminal’, a ‘wireless terminal’, a ‘user device’, or other terms having an equivalent technical meaning thereto in addition to the term ‘terminal’.
  • UE user equipment
  • the base station (110), the first terminal (120), and the second terminal (130) can transmit and receive wireless signals in a millimeter wave (mmWave) band (e.g., 28 GHz, 30 GHz, 38 GHz, 60 GHz).
  • mmWave millimeter wave
  • the base station (110), the first terminal (120), and the second terminal (130) can perform beamforming.
  • the beamforming can include transmission beamforming and reception beamforming. That is, the base station (110), the first terminal (120), and the second terminal (130) can provide directionality to a transmission signal or a reception signal.
  • the base station (110) and the terminals (120, 130) can select serving beams through a beam search or beam management procedure. After serving beams are selected, subsequent communications can be performed through resources that are in a quasi co-located (QCL) relationship with the resource that transmitted the serving beams.
  • QCL quasi co-located
  • the first antenna port and the second antenna port may be evaluated to have a QCL relationship if large-scale characteristics of a channel carrying a symbol on the first antenna port can be inferred from a channel carrying a symbol on the second antenna port.
  • the large-scale characteristics may include at least one of delay spread, Doppler spread, Doppler shift, average gain, average delay, and a spatial receiver parameter.
  • FIG. 2 illustrates a functional configuration of a base station in a wireless communication system according to various embodiments of the present disclosure.
  • the configuration illustrated in FIG. 2 can be understood as a configuration of a base station (110).
  • Terms such as ‘... unit’, ‘... unit’, etc. used hereinafter mean a unit that processes at least one function or operation, and this can be implemented by hardware or software, or a combination of hardware and software.
  • the base station includes a wireless communication unit (210), a backhaul communication unit (220), a storage unit (230), and a control unit (240).
  • a wireless communication unit 210
  • a backhaul communication unit 220
  • a storage unit 230
  • a control unit 240
  • the wireless communication unit (210) performs functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit (210) performs a conversion function between a baseband signal and a bit stream according to the physical layer standard of the system. For example, when transmitting data, the wireless communication unit (210) encodes and modulates a transmission bit stream to generate complex symbols. In addition, when receiving data, the wireless communication unit (210) restores a reception bit stream by demodulating and decoding a baseband signal.
  • the wireless communication unit (210) up-converts a baseband signal into an RF (radio frequency) band signal and transmits it through an antenna, and down-converts an RF band signal received through the antenna into a baseband signal.
  • the wireless communication unit (210) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), etc.
  • the wireless communication unit (210) may include a plurality of transmission and reception paths.
  • the wireless communication unit (210) may include at least one antenna array composed of a plurality of antenna elements.
  • the wireless communication unit (210) may be composed of a digital unit and an analog unit, and the analog unit may be composed of a plurality of sub-units depending on operating power, operating frequency, etc.
  • the digital unit may be implemented with at least one processor (e.g., a digital signal processor (DSP)).
  • DSP digital signal processor
  • the wireless communication unit (210) transmits and receives signals as described above. Accordingly, all or part of the wireless communication unit (210) may be referred to as a ‘transmitter’, a ‘receiver’ or a ‘transceiver’. In addition, in the following description, transmission and reception performed through a wireless channel are used to mean that the processing described above is performed by the wireless communication unit (210).
  • the backhaul communication unit (220) provides an interface for performing communication with other nodes within the network. That is, the backhaul communication unit (220) converts a bit string transmitted from a base station to another node, such as another access node, another base station, an upper node, a core network, etc., into a physical signal, and converts a physical signal received from another node into a bit string.
  • a base station such as another access node, another base station, an upper node, a core network, etc.
  • the storage unit (230) stores data such as basic programs, application programs, and setting information for the operation of the base station.
  • the storage unit (230) may be composed of volatile memory, nonvolatile memory, or a combination of volatile memory and nonvolatile memory.
  • the storage unit (230) provides stored data according to a request from the control unit (240).
  • the control unit (240) controls the overall operations of the base station. For example, the control unit (240) transmits and receives signals through the wireless communication unit (210) or the backhaul communication unit (220). In addition, the control unit (240) records and reads data in the storage unit (230). In addition, the control unit (240) can perform functions of a protocol stack required by a communication standard. According to another implementation example, the protocol stack can be included in the wireless communication unit (210). To this end, the control unit (240) can include at least one processor.
  • control unit (240) can control the base station to perform operations according to various embodiments described below.
  • FIG. 3 illustrates a functional configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure.
  • the configuration illustrated in FIG. 3 can be understood as a configuration of a terminal (120, 130).
  • Terms such as ‘... unit’, ‘... device’, etc. used hereinafter mean a unit that processes at least one function or operation, and this can be implemented by hardware or software, or a combination of hardware and software.
  • the communication unit (310) performs functions for transmitting and receiving signals through a wireless channel. For example, the communication unit (310) performs a conversion function between a baseband signal and a bit stream according to the physical layer specifications of the system. For example, when transmitting data, the communication unit (310) encodes and modulates a transmission bit stream to generate complex symbols. In addition, when receiving data, the communication unit (310) restores a reception bit stream by demodulating and decoding a baseband signal. In addition, the communication unit (310) up-converts a baseband signal into an RF band signal and then transmits it through an antenna, and down-converts an RF band signal received through the antenna into a baseband signal.
  • the communication unit (310) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc.
  • the communication unit (310) transmits and receives signals as described above. Accordingly, all or part of the communication unit (310) may be referred to as a ‘transmitter’, a ‘receiver’, or a ‘transmitter-receiver’. In addition, in the following description, transmission and reception performed through a wireless channel are used to mean that processing as described above is performed by the communication unit (310).
  • control unit (330) can control the terminal to perform operations according to various embodiments described below.
  • the horizontal axis represents the time domain
  • the vertical axis represents the frequency domain.
  • the length of a radio frame (404) is 10 ms.
  • the radio frame (404) may be a time domain section composed of 10 subframes.
  • the length of a subframe (403) is 1 ms.
  • a configuration unit in the time domain may be an OFDM (orthogonal frequency division multiplexing) and/or DFT-s-OFDM (DFT (discrete Fourier transform)-spread-OFDM) symbol, and Nsymb OFDM and/or DFT-s-OFDM symbols (401) may be gathered to configure one slot (402).
  • an OFDM symbol may include a symbol for a case where a signal is transmitted and received using an OFDM multiplexing scheme
  • a DFT-s-OFDM symbol may include a symbol for a case where a signal is transmitted and received using a DFT-s-OFDM or SC-FDMA (single carrier frequency division multiple access) multiplexing scheme.
  • the minimum transmission unit in the frequency domain is a subcarrier, and a carrier bandwidth constituting a resource grid may be configured with a total of NscBW subcarriers (405).
  • a basic unit of resources in the time-frequency domain may be a resource element (RE) (406), and the resource element (406) may be expressed by an OFDM symbol index and a subcarrier index.
  • a resource block may include a plurality of resource elements.
  • the frequency domain may include common resource blocks (CRBs).
  • a physical resource block (PRB) may be defined in a bandwidth part (BWP) in the frequency domain. CRB and PRB numbers may be determined differently according to a subcarrier spacing.
  • an RB may be defined by N symb consecutive OFDM symbols in the time domain and N S CRB consecutive subcarriers in the frequency domain.
  • scheduling information for downlink data or uplink data may be transmitted from a base station (110) to a terminal (120) via downlink control information (DCI).
  • DCI downlink control information
  • the DCI may be defined according to various formats, and each format may indicate whether the DCI includes scheduling information for uplink data (e.g., UL grant), scheduling information for downlink data (DL resource allocation), whether it is a compact DCI with a small size of control information, whether it is a fall-back DCI, whether spatial multiplexing using multiple antennas is applied, and/or whether it is DCI for power control.
  • NR DCI format 1_0 or NR DCI format 1_1 may include scheduling for downlink data.
  • NR DCI format 0_0 or NR DCI format 0_1 may include scheduling for uplink data.
  • FIG. 4 shows an example of downlink and uplink slot structures in a wireless communication system.
  • FIG. 4 shows a structure of a resource grid of a 3GPP NR system.
  • a slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
  • OFDM orthogonal frequency division multiplexing
  • RBs resource blocks
  • a signal may be configured with part or all of the resource grid.
  • the number of OFDM symbols included in one slot may generally vary depending on the length of a cyclic prefix (CP).
  • CP cyclic prefix
  • the modulation method of the generated signal is not limited to a specific value of QAM (Quadrature Amplitude Modulation), and can follow the modulation methods of various communication standards, such as BPSK (Binary phase-shift keying) and QPSK (Quadrature Phase Shift Keying).
  • QAM Quadrature Amplitude Modulation
  • BPSK Binary phase-shift keying
  • QPSK Quadrature Phase Shift Keying
  • an operation for controlling uplink retransmission for efficient signal transmission is described based on an LTE communication system or an NR communication system, but the contents of the present disclosure are not limited thereto and can be applied to various wireless communication systems for transmitting downlink or uplink control information.
  • the contents of the present disclosure can be applied in an unlicensed band as well as a licensed band, as needed.
  • higher layer signaling or higher signal may be a signal transmission method in which a base station (110) transmits a signal to a terminal (120) using a downlink data channel of a physical layer, or from a terminal (120) to a base station (110) using an uplink data channel of a physical layer.
  • the higher layer signaling may include at least one of radio resource control (RRC) signaling, signaling according to an F1 interface between a centralized unit (CU) and a distributed unit (DU), or a signal transmission method transmitted through a medium access control (MAC) control element (MAC CE).
  • RRC radio resource control
  • MAC medium access control
  • the higher layer signaling or higher signal may include system information that is commonly transmitted to a plurality of terminals (120), for example, a system information block (SIB).
  • SIB system information block
  • a synchronization signal block (or referred to as an SS block, an SS/PBCH block, etc.) may be transmitted for initial access, and the synchronization signal block may be composed of a primary synchronization signal (PSS), a secondary synchronization, signal (SSS), and a physical broadcast channel (PBCH).
  • the SSB may include information on a beam that a base station uses to transmit a signal, and an SSB index or SSB described below may mean at least one beam.
  • the terminal may obtain downlink time and frequency domain synchronization and a cell ID from a synchronization signal through a cell search procedure.
  • the synchronization signal may include a PSS and an SSS.
  • the terminal may receive a PBCH including a master information block (MIB) from the base station, and obtain system information related to transmission and reception, such as system bandwidth or related control information, and basic parameter values.
  • the terminal can obtain a system information block (SIB) by performing decoding on the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) based on the received PBCH. After that, the terminal can exchange identity with the base station through a random access step and go through steps such as registration and authentication to initially access the network.
  • SIB system information block
  • one slot may include 14 symbols, and according to various embodiments of the present disclosure, the uplink-downlink configuration of symbols and/or slots in a 5G communication system may be set in three stages.
  • the uplink-downlink of a symbol and/or slot can be set semi-statically through cell-specific configuration information via system information on a symbol-by-symbol basis.
  • the cell-specific uplink-downlink configuration information via system information may include uplink-downlink pattern information and reference subcarrier information.
  • the uplink-downlink pattern information may indicate a pattern periodicity, the number of consecutive downlink slots from a start point of each pattern, the number of symbols in the next slot, the number of consecutive uplink slots from the end of the pattern, and the number of symbols in the next slot. Slots and symbols that are not indicated as uplink and downlink may be determined as flexible slots/symbols.
  • a flexible slot or a slot containing flexible symbols can be indicated by a number of consecutive downlink symbols from the start symbol of the slot and a number of consecutive uplink symbols from the end of the slot, respectively, or by the entire downlink or the entire uplink of the slot.
  • symbols indicated as flexible symbols in each slot can be indicated as downlink symbols, uplink symbols, or flexible symbols, via a slot format indicator (SFI) included in a downlink control channel.
  • SFI slot format indicator
  • the slot format indicator can select one index from a table in which an uplink-downlink configuration of 14 symbols in one slot is preset.
  • an additional reference signal may be transmitted to a resource element (RE).
  • a signal transmitted together with a signal transmitted through a physical layer channel is called a demodulation reference signal (DMRS).
  • DMRS demodulation reference signal
  • Orthogonal DMRS can be supported by configuring DMRS patterns defined in the form of frequency domain-orthogonal cover code (FD-OCC), time domain-orthogonal cover code (TD-OCC), and Comb, and ensuring orthogonality between the configured DMRS patterns.
  • the terminal can calculate channel and interference components for different layers using orthogonal DMRS in a data channel, and can restore the data channel using the calculated channel and interference components for each layer.
  • FIG. 5 is a diagram showing an example of a DMRS pattern configuration according to various embodiments of the present disclosure. More specifically, FIG. 5 relates to a DMRS pattern per port of a DMRS transmitted using two OFDM symbols supported in PDSCH transmission.
  • the DMRS patterns illustrated in FIG. 5 are defined and configured in the form of a frequency domain-orthogonal cover code (FD-OCC), a time domain-orthogonal cover code (TD-OCC), and a Comb, and each of 510 to 565 in FIG. 5 can sequentially correspond to 12 DMRS port patterns 1000 to 1011, respectively.
  • FD-OCC frequency domain-orthogonal cover code
  • TD-OCC time domain-orthogonal cover code
  • Comb Comb
  • FIG. 6 is a diagram illustrating an example of mapping a DMRS to a resource element grid according to various embodiments of the present disclosure.
  • a DMRS sequence called r(n) is applied to each DMRS pattern (610) (615), and the DMRS generated accordingly can be mapped to a resource element grid (620).
  • the sequence r(n) is a DMRS scrambling ID ( ) can be generated by modulating c(n) with QPSK.
  • DMRS ports can be indicated to terminals.
  • a base station when supporting MU-MIMO in 5G NR, a base station can allocate the same DMRS port as the DMRS port allocated to a specific terminal to other terminals, and in particular, when a base station allocates the same DMRS port between different layers, this can be called non-orthogonal DMRS.
  • the base station When non-orthogonal DMRS is operated, the base station can minimize interference between non-orthogonal DMRS ports by using different r(n) sequences or DMRS scrambling IDs ( ) can be used.
  • Non-orthogonal DMRS has less resource overhead than orthogonal DMRS, and non-orthogonal DMRS can be mainly used when the estimated channel between the base station and the terminal is accurate and the precoder used by the base station can effectively remove interference between layers.
  • FIG. 7 is a diagram illustrating an example of DMRS port allocation according to various embodiments of the present disclosure. More specifically, FIG. 7 illustrates DMRS port allocation for each of a plurality of terminals performing MU-MIMO operation.
  • DMRS ports 1001 and 1002 may be allocated for PDSCH reception for a first terminal (701)
  • DMRS ports 1003 and 1004 may be allocated for PDSCH reception for a second terminal (703)
  • DMRS ports 1005 and 1006 may be allocated for PDSCH reception for a third terminal (705).
  • DMRS ports 1001 and 1002 may be allocated to the first terminal (701) for PDSCH reception
  • DMRS ports 1003 and 1004 may be allocated to the second terminal (703) for PDSCH reception
  • DMRS ports 1005 and 1006 may be allocated to the third terminal (705) for PDSCH reception
  • DMRS ports 101 and 1002, which are the same as the DMRS ports allocated to the first terminal (701) may be allocated to the fourth terminal (707).
  • the DMRS port number is the same, but different DMRS sequences r(n) are used, or different DMRS scrambling IDs ( ) are allocated, the first terminal (701) and the fourth terminal (707) can remove residual interference components between layers that the precoder of the base station could not completely remove.
  • the same DMRS port can be assigned to different terminals in duplicates, but there is no way to assign the same DMSR port to a single terminal in duplicates.
  • a situation in which more than 8 layers are assigned to a single terminal can be considered. If only orthogonal DMRS ports are assigned to a single terminal, too much overhead may occur.
  • FIG. 8 is a diagram showing an example of a DMRS port pattern configuration for allocating more than 8 layers to a single terminal according to various embodiments of the present disclosure. More specifically, FIG. 8 relates to a method for increasing the value of the OCC length applied when configuring the DMRS port pattern in the time domain to allocate more than 8 layers to a single terminal through SU-MIMO.
  • the value of the OCC length applied as 2 in the example of FIG. 5 is increased to 4, and by applying the OCC length as 4, an orthogonal DMRS port pattern of up to 24 layers can be configured (810). That is, 1000 to 1023 orthogonal DMRS port patterns can be configured.
  • the DMRS port pattern of Fig. 8 has the same DMRS density in the frequency side as the DMRS port pattern of Fig. 5.
  • a method of increasing the value of the OCC length applied when configuring the DMRS port pattern is used, there is a problem that the overhead occupied by resources for orthogonal DMRS transmission on the resource grid may significantly increase as the number of layers allocated to a single terminal increases (815). That is, in the case of Fig. 5, only two OFDM symbols are used on the resource grid for orthogonal DMRS transmission, whereas in the case of Fig. 8, four OFDM symbols are used on the resource grid for orthogonal DMRS transmission, so the overhead occupied by resources for orthogonal DMRS transmission on the resource grid may significantly increase.
  • a method of allocating non-orthogonal DMRS ports may be required to reduce overhead.
  • a method of redundantly allocating the same DMRS port to a single terminal may be required.
  • FIG. 9 is a diagram illustrating an antenna configuration of a base station of an eXtreme-MIMO system according to various embodiments of the present disclosure.
  • the number of antennas and the number of digital ports of a base station can significantly increase.
  • 192 TRXs are used in an NR base station (910)
  • 3,072 TRXs can be used in an eXtreme-MIMO system base station (915).
  • more accurate channel estimation can be performed by utilizing a large number of antennas and digital ports on the base station side, and interference between layers can be dramatically reduced compared to 5G NR by utilizing a more accurate precoder.
  • the method for allocating a non-orthogonal DMRS to a single terminal of the present disclosure includes a method of indicating a non-orthogonal DMRS group (group) that is associated with different receiving antenna ports of the terminal and uses different r(n) sequences, respectively, when the terminal transmits information about receiving antenna ports of the terminal to a base station through SRS/CSI-RS, etc.
  • the non-orthogonal DMRS group (group) that uses different r(n) sequences may mean a DMRS group configured to include the same DMRS port.
  • the method for allocating a non-orthogonal DMRS to a single terminal of the present disclosure includes a DMRS scrabbling ID (ID) used to generate a DMRS sequence r(n) used in each of the DMRS (non-orthogonal) groups of the terminal. ) and a method for indicating the same.
  • the method for allocating non-orthogonal DMRS to a single terminal of the present disclosure includes a method for indicating a non-orthogonal DMRS port to the terminal through an antenna port(s) field of downlink control information (DCI) for DMRS transmission via non-orthogonal DMRS port allocation on a data channel (PDSCH/PUSCH).
  • DCI downlink control information
  • the method for allocating non-orthogonal DMRS to a single terminal of the present disclosure includes a method for operating the terminal when the terminal operates as a receiver of a data channel (PDSCH). It should be understood that at least one of the methods included in the present disclosure may be combined with each other to be performed as a single overall operation.
  • PDSCH data channel
  • FIG. 10 is a diagram illustrating an example of a configuration of a DMRS port group and a terminal receiving antenna port associated with a DMRS port group according to various embodiments of the present disclosure.
  • a terminal includes eight receiving antenna ports, and the terminal transmits information about the receiving antenna ports of the terminal to a base station through SRS/CSI-RS, etc., and the base station can identify the receiving antenna ports of the terminal through this.
  • DMRS port group 1 (1001) may be associated with four of the eight receiving antenna ports of the terminal and the receiving antenna ports
  • DMRS port group 2 (1002) may be associated with the remaining four receiving antenna ports, excluding the four receiving antenna ports associated with DMRS port group 1 (1001), among the eight terminal receiving antenna ports.
  • DMRS port group 1 (1001) and DMRS port group 2 (1002) may be configured to be non-orthogonal to each other by including DMRS ports of ports 1000 to 1003, which are the same DMRS ports.
  • different sequences may be used for the DMRS sequence r(n) for generating the DMRS port included in DMRS port group 1 (1001) and the DMRS sequence r(n) for generating the DMRS port included in DMRS port group 2 (1002).
  • FIG. 11 is a diagram illustrating an example of non-orthogonal DMRS port allocation for a single terminal according to various embodiments of the present disclosure.
  • two non-orthogonal different DMRS groups (1110, 1115) including the same DMRS port can be allocated to a single terminal.
  • each of the DMRS groups (1110, 1115) can be associated with a different receive antenna port of the terminal, and a different DMRS sequence r(n) can be used for each of the DMRS groups (1110, 1115).
  • non-orthogonal DMRS groups which are respectively associated with different receiving antenna ports of a terminal, when the terminal transmits information about the terminal's receiving antenna ports to a base station through SRS/CSI-RS, etc.
  • different r(n) sequences and/or scrambling ID sequences cinit may be used for each non-orthogonal DMRS group to minimize interference.
  • the terminal When a terminal transmits information about terminal capability (UE capability) to a base station, the terminal may report information about the maximum number of non-orthogonal DMRS groups that the terminal can operate for data channel (PUSCH/PDSCH) transmission/reception, including the information in the terminal capability information.
  • the information about the terminal capability may be transmitted via RRC (radio resource control) signaling.
  • RRC radio resource control
  • the terminal may report information about the maximum number of downlink non-orthogonal DMRS groups that the terminal can operate for PDSCH reception, including the information in the terminal capability information.
  • the base station can transmit information about the number of non-orthogonal DMRS groups that the base station can operate to the terminal, to the terminal that has transmitted information about the terminal capability.
  • Information about the number of non-orthogonal DMRS groups that the base station can operate to the terminal can be transmitted to the terminal as configuration information through RRC (radio resource control) signaling.
  • the number of non-orthogonal DMRS groups that the base station can instruct to the terminal can be set to a number that is equal to or smaller than the maximum number of non-orthogonal DMRS groups that the terminal can operate, as reported by the terminal.
  • the base station can transmit, to the terminal that transmitted the information on the terminal capability, information on the number of downlink non-orthogonal DMRS groups that the base station can operate to the terminal.
  • the number of downlink non-orthogonal DMRS groups that the base station can instruct to the terminal can be set to a number equal to or smaller than the number of downlink non-orthogonal DMRS groups that the terminal can operate at maximum as reported by the terminal.
  • the number of downlink non-orthogonal DMRS groups that the terminal can operate at maximum as reported by the terminal to the base station is 4, the number of downlink non-orthogonal DMRS groups that the base station can instruct to the terminal can be set to a number less than or equal to 4.
  • FIG. 12 and FIG. 13 are diagrams showing an example of an operation in which a terminal transmits information about a receiving antenna port of the terminal to a base station according to various embodiments of the present disclosure.
  • a terminal can indirectly inform a base station of information about a channel for each receiving antenna port by using SRS/CSI-RS, etc.
  • the terminal (1210) can inform the base station (1220) of a channel for each antenna port of the terminal through a TAS (Transmit Antenna Switching) operation.
  • the TAS (Transmit Antenna Switching) operation may mean an operation in which the terminal transmits an SRS to the base station through each transmitting antenna port while changing the transmitting antenna port.
  • the base station can recognize the antenna ports in the order of the channels for each antenna port that the terminal notifies the base station.
  • channel reciprocity which can assume that the characteristics of the uplink channel and the downlink channel are the same, can be assumed.
  • FIG. 13 illustrates an example in which a terminal transmits information about a receiving antenna port of the terminal to a base station through CSI feedback based on CSI-RS
  • CSI-related feedback e.g., PMI
  • the base station has identified the channel for each reception antenna port of the terminal through the operations described in FIGS. 12 and 13, the following describes methods for the base station to indicate to the terminal a non-orthogonal DMRS group associated with the reception antenna port of the terminal.
  • the non-orthogonal DMRS port sets operated by the base station may mean non-orthogonal DMRS groups.
  • the base station and the terminal will operate in the order of the receiving antenna ports. It is assumed/configured that the ports are associated with K different non-orthogonal DMRS groups, and at this time, the last non-orthogonal DMRS group can be assumed/configured to be associated with the remaining antenna ports except for the receiving antenna ports of the terminal that are associated with K-1 non-orthogonal DMRS groups.
  • the number of receiving antenna ports of the terminal corresponding to each DMRS group except for the last DMRS group among the DMRS groups is the same, and the last DMRS group can include the number of receiving antenna ports remaining except for the number of receiving antenna ports of the terminal corresponding to each DMRS group except for the last DMRS group. More specifically, when the number of receiving antenna ports of the terminal is N (N is a natural number) and the number of DMRS groups is K (K is a natural number), the receiving antenna ports of the terminal can be indexed with numbers from 1 to N, and the DMRS groups can be indexed with numbers from 1 to K.
  • Each DMRS group is assigned an index from 1 to K-1 in units of N, and is associated with each other in ascending order of the index assigned to the receiving antenna port and in ascending order of the index assigned to the DMRS group, (N- *(K-1)) receiving antenna ports can be associated with the DMRS group to which an index K is assigned. For example, if the number of receiving antenna ports of the terminal is 7 and the number of configured non-orthogonal DMRS groups is 2, port indices from 1 to 7 can be assigned, respectively, and two non-orthogonal DMRS groups can be assigned group indices of 1 and 2, respectively.
  • receiving antenna ports assigned with port indices 1 to 4 can be associated with the non-orthogonal DMRS group assigned with group index 1
  • receiving antenna ports assigned with port indices 5 to 7 can be associated with the non-orthogonal DMRS group assigned with group index 2.
  • the base station can explicitly indicate a non-orthogonal DMRS group associated with the receive antenna ports for each of the receive antenna ports of the terminal, and the base station can individually indicate to the terminal the receive antenna ports of the terminal associated with the non-orthogonal DMRS groups for all operable non-orthogonal DMRS groups.
  • RRC signaling can be used to indicate to the terminal the receive antenna ports of the terminal associated with the non-orthogonal DMRS groups.
  • the RRC parameter DMRS-DownlinkConfig includes configuration information (e.g., dmrsGroup1, etc.) for indicating a terminal receive antenna port associated with DMRS group 1 and configuration information (e.g., dmrsGroup2, etc.) for indicating a terminal receive antenna port associated with DMRS group 2, and the base station can indicate to the terminal the non-orthogonal DMRS group associated with the terminal receive antenna port through the corresponding configuration information.
  • configuration information e.g., dmrsGroup1, etc.
  • configuration information e.g., dmrsGroup2, etc.
  • the base station can configure and instruct the non-orthogonal DMRS groups associated with the respective receive antenna ports of the terminal in different forms depending on the situations in which different numbers of non-orthogonal DMRS groups are operated. More specifically, when the number of receive antenna ports of the terminal is 8 and the number of configured non-orthogonal DMRS groups is 2, configuration information for receive antenna ports of the terminal associated with the first non-orthogonal DMRS group (e.g., antenna ports 1 to 4) and configuration information for receive antenna ports of the terminal associated with the second non-orthogonal DMRS group (e.g., antenna ports 5 to 8) can be configured.
  • configuration information for receiving antenna ports of the terminal e.g., antenna ports 1 to 2) associated with the first non-orthogonal DMRS group
  • configuration information for receiving antenna ports of the terminal e.g., antenna ports 3 to 4 associated with the second non-orthogonal DMRS group
  • configuration information for receiving antenna ports of the terminal e.g., antenna ports 5 to 6 associated with the third non-orthogonal DMRS group
  • configuration information for receiving antenna ports of the terminal e.g., antenna ports 7 to 8 associated with the fourth non-orthogonal DMRS group
  • the configuration of the reception antenna ports of the terminal associated with a specific non-orthogonal DMRS group can be configured in various ways. For example, in the case where the number of reception antenna ports of the terminal described above is 8 and the number of configured non-orthogonal DMRS groups is 2, unlike the case where the antenna ports are sequentially configured to be associated with each non-orthogonal DMRS group, antenna ports 1, 3, 5, and 7 can be configured to be associated with non-orthogonal DMRS group 1, and antenna ports 2, 4, 6, and 8 can be configured to be associated with non-orthogonal DMRS group 2.
  • the number of receive antenna ports of the terminal is 8 and the number of configured non-orthogonal DMRS groups is 2, the number of cases in which one non-orthogonal DMRS group can be associated with 4 receive antenna ports out of the 8 receive antenna ports is 8C4 (8*7*6*5 / 4*3*2*1). Therefore, according to the present embodiment, if the number of receive antenna ports of the terminal is 8 and the number of configured non-orthogonal DMRS groups is 2, the number of possible association relationships between non-orthogonal DMRS port groups and the receive antenna ports of the terminal can be 8C4. Alternatively, it may be possible to apply the present method by setting the numbers of receive antenna ports of the terminal associated with each non-orthogonal DMRS port group to different numbers.
  • the number of reception antenna ports of a terminal is 8 and the number of configured non-orthogonal DMRS groups is 2, five reception antenna ports of the terminal may be configured to be associated with the first non-orthogonal DMRS group, and three reception antenna ports of the terminal may be configured to be associated with the second non-orthogonal DMRS group.
  • the number of cases in which three reception antenna ports out of the eight reception antenna ports can be associated with the first non-orthogonal DMRS group is 8C3 (8*7*6 / 3*2*1), and when three reception antenna ports associated with the first DMRS group are determined, the remaining five reception antenna ports are associated with the remaining DMRS groups, so according to one embodiment, 8C3 association relationship configurations between non-orthogonal DMRS port groups and reception antenna ports of the terminal may be possible.
  • the base station may instruct the non-orthogonal DMRS groups associated with the antenna ports of the terminal, but the instruction may be performed only for some specific non-orthogonal DMRS groups operated by the base station.
  • the ports are associated with different DMRS groups, i.e., this method can be a hybrid of the two methods described above.
  • FIGS. 14 and 15 are diagrams illustrating an example of a configuration of an association relationship between a terminal receiving antenna port and a non-orthogonal DMRS group operated in a base station according to various embodiments of the present disclosure. More specifically, FIGS. 14 and 15 are diagrams illustrating a method in which an association relationship between a terminal and a base station is implicitly assumed/established based on a receiving antenna port index and a non-orthogonal DMRS group index, without the base station explicitly setting the association relationship between the terminal's receiving antenna port and the non-orthogonal DMRS group.
  • the terminal notifies the base station of 16 receiving antenna ports in the form of two sets of 8 by 1 uniform linear array antennas through SRS or CSI-RS feedback, and the base station operates two non-orthogonal DMRS groups.
  • receiving antenna ports 1 to 8 of the terminal may be set/assumed between the terminal and the base station to be associated with non-orthogonal DMRS group 1
  • receiving antenna ports 9 to 16 of the terminal may be set/assumed between the terminal and the base station to be associated with non-orthogonal DMRS group 2.
  • receiving antenna ports 1 to 4 of the terminal may be set/assumed between the terminal and the base station to be associated with non-orthogonal DMRS group 1
  • receiving antenna ports 5 to 8 of the terminal may be set/assumed between the terminal and the base station to be associated with non-orthogonal DMRS group 2.
  • the DMRS scrambling ID to be used for each non-orthogonal DMRS group set to the terminal ( ) describes a method for defining and indicating.
  • FIG. 16 is a diagram showing an example of a method for indicating a DMRS scrambling ID required for generating a DMRS sequence to be used for non-orthogonal DMRS groups according to various embodiments of the present disclosure.
  • a DMRS scrambling ID ( ) can be defined as the mathematical formula below.
  • the first non-orthogonal DMRS group when operating two DMRS groups, is used for generating DMRS sequences.
  • the value is used (1610), for the DMRS sequence generation of the second non-orthogonal DMRS group, for the DMRS sequence generation of the first non-orthogonal DMRS group.
  • the value can be used in a transformed form. More specifically, when only one DMRS group is set, the value indicated by the DCI field The value can have either 0 or 1, and is not indicated by the DCI field. Other generated based on values The value may not be used.
  • FIG. 17 is a diagram showing another example of a method for indicating a DMRS scrambling ID required for generating a DMRS sequence to be used for non-orthogonal DMRS groups according to various embodiments of the present disclosure.
  • the DMRS scrambling ID ( ) can be defined as the mathematical formula below.
  • the DMRS scrambling ID of the method according to Fig. 17 ( ) includes parameters may include more.
  • silver may be a parameter indicating the th non-orthogonal DMRS group. For example, if there are a total of 4 non-orthogonal DMRS groups operated by the base station, The values can be 0, 1, 2, 3 depending on the corresponding non-orthogonal DMRS group.
  • 17 is about the case where two non-orthogonal DMRS groups are operated, CDM group, , DMRS scrambling ID used for each of the first non-orthogonal DMRS group (1710) and the second non-orthogonal DMRS group (1720) in the value
  • CDM group a non-orthogonal DMRS group
  • DMRS scrambling ID used for each of the first non-orthogonal DMRS group (1710) and the second non-orthogonal DMRS group (1720) in the value
  • the values can be set differently.
  • the terminal reports to the base station the maximum number of non-orthogonal DMRS groups that the terminal can operate, and the base station sets the number of non-orthogonal DMRS groups to be operated, thereby preventing unnecessary PDSCH decoding. For example, if the terminal reports the maximum number of non-orthogonal DMRS groups that can be operated as 4, and the base station sets the number of non-orthogonal DMRS groups to be operated as 2, the terminal reports the number of non-orthogonal DMRS groups to be operated as 2 for the third non-orthogonal DMRS group. For the values and the fourth non-orthogonal DMRS group The value may not be calculated.
  • DCI downlink control information
  • a base station can indicate to a terminal a non-orthogonal DMRS port for receiving a downlink data channel of the terminal through an Antenna port(s) (and number of layers field) field of DCI.
  • the present disclosure can include a method in which reserved rows in a DMRS port/pattern table related to the Antenna port(s) field of the DCI are used.
  • the DMRS port/pattern table can be a DMRS port/pattern table used to indicate an orthogonal DMRS port to a single terminal of SU-MIMO.
  • the present disclosure may include a method of defining a new DMRS port/pattern table.
  • the Reserved rows existing in the DMRS antenna port table e.g., Table 7.3.1.2.2-1 to Table 7.3.1.2.2-4A of the 3GPP TS38.212 standard
  • the base station used to indicate the DMRS port for PDSCH reception to the terminal through the existing DCI e.g., DCI format 1_1
  • FIGS. 18 to 21 are diagrams illustrating examples of a method for indicating a non-orthogonal DMRS port to a terminal using an antenna port(s) field of downlink control information (DCI) according to various embodiments of the present disclosure. More specifically, FIGS. 18 to 21 are diagrams illustrating a method for utilizing a reserved row of a DMRS port/pattern table used to indicate an orthogonal DMRS port to a single terminal of SU-MIMO.
  • DCI downlink control information
  • the table of FIG. 18 may include a value (1801) corresponding to a value of a DCI antenna port(s) field, information on the number of DMRS CDM groups having no data corresponding to the value (1803), information on the configuration of DMRS ports (1805), and information on the number of front-loaded symbols (1807).
  • the reserved rows of the DMRS port/pattern table used to indicate an orthogonal DMRS port to a single terminal of SU-MIMO are configured as rows for indicating a non-orthogonal DMRS port to a single terminal of SU-MIMO (1810).
  • NR DMRS Configuration Type1 double symbol, i.e., DMRS in which two OFDM symbols are used for one DMRS
  • non-orthogonal DMRS can utilize DMRS port of NR DMRS Configuration Type1.
  • value 17-31 represents new reserved rows created according to the increase in the number of bits for configuring rows for indicating non-orthogonal DMRS ports (1820). It goes without saying that all or part of value 17-31 can also be configured as rows for indicating non-orthogonal DMRS ports to a single terminal of SU-MIMO.
  • FIG. 1 double symbol, i.e., DMRS in which two OFDM symbols are used for one DMRS
  • a DMRS pattern (1930) corresponding to the 4th row of FIG. 18 is illustrated, which represents an allocation of two non-orthogonal DMRS groups (1920, 1925) including two identical DMRS ports (port 1000 and port 1001)
  • a DMRS pattern (1940) corresponding to the 6th row of FIG. 18 is illustrated, which represents an allocation of two non-orthogonal DMRS groups (1920, 1925) including four identical DMRS ports (port 1000, port 1001, port 1002, and port 1003).
  • a DMRS pattern corresponding to the 9th row of FIG. 18 is illustrated, which represents the allocation of two non-orthogonal DMRS groups (2020, 2025) including four identical DMRS ports (port 1000, port 1001, port 1004, and port 1005).
  • a DMRS pattern corresponding to the 16th row of FIG. 18 is illustrated, which represents the allocation of two non-orthogonal DMRS groups (2120, 2125) including eight identical DMRS ports (port 1000, port 1001, port 1002, port 1003, port 1004, port 1005, port 1006, and port 1007).
  • FIGS. 22 to 25 are diagrams illustrating still another example of a method for indicating a non-orthogonal DMRS port to a terminal by using an antenna port(s) field of downlink control information (DCI) according to various embodiments of the present disclosure. More specifically, FIGS. 22 to 25 are diagrams illustrating a method for utilizing a reserved row of a DMRS port/pattern table used to indicate an orthogonal DMRS port to a single terminal of SU-MIMO.
  • the DMRS port/pattern table of FIG. 22 may utilize a reserved field of an existing NR DMRS Configuration Type2 (double symbol) Table.
  • the table of FIG. 22 may include a value (2201) corresponding to a value of a DCI antenna port(s) field, information on the number of DMRS CDM groups having no data corresponding to the value (2203), information on the configuration of DMRS ports (2205), and information on the number of front-load symbols (2207).
  • the reserved rows of the DMRS port/pattern table used to indicate an orthogonal DMRS port to a single terminal of SU-MIMO are configured with rows for indicating a non-orthogonal DMRS port to a single terminal of SU-MIMO (2210).
  • values 23-31 represent new reserved rows created according to an increase in the number of bits for configuring rows for indicating a non-orthogonal DMRS port (2220). It should be noted that all or part of values 23-31 may also be configured as rows for indicating a non-orthogonal DMRS port to a single terminal of SU-MIMO. In addition, the example of FIG. 22 is merely an example of configuring rows for indicating a non-orthogonal DMRS port to a single terminal of SU-MIMO, and the method of configuring rows for indicating a non-orthogonal DMRS port using reserved rows of the DMRS port/pattern table described in the present disclosure is not limited thereto.
  • a DMRS pattern (2230) corresponding to the 8th row of FIG. 22 is illustrated, which represents an allocation of two non-orthogonal DMRS groups (2320, 2325) including four identical DMRS ports (ports 1000, 1001, 1002, and port 1003), and a DMRS pattern (2340) corresponding to the 12th row of FIG. 22 is illustrated, which represents an allocation of two non-orthogonal DMRS groups (2320, 2325) including four identical DMRS ports (port 1000, port 1001, port 1006, and port 1007).
  • a DMRS pattern corresponding to the 21st row of FIG. 24 is illustrated, which represents the allocation of two non-orthogonal DMRS groups (2420, 2425) including eight identical DMRS ports (port 1002, port 1003, port 1004, port 1005, port 1008, port 1009, port 1010, and port 1011).
  • a DMRS pattern corresponding to the 22nd row of FIG. 24 is illustrated, which represents the allocation of two non-orthogonal DMRS groups (2520, 2525) including twelve identical DMRS ports (port 1000, port 1001, port 1002, port 1003, port 1004, port 1005, port 1006, port 1007, port 1008, port 1009, port 1010 and port 1011).
  • FIG. 26 is a diagram illustrating another example of a method for indicating a non-orthogonal DMRS port to a terminal by using an antenna port(s) field of downlink control information (DCI) according to various embodiments of the present disclosure.
  • the table of FIG. 26 may include a value (2610) corresponding to a value of a DCI antenna port(s) field, a DMRS configuration type (2620) corresponding to the value, information on the number of DMRS CDM groups having no data (2630), information on the configuration of DMRS ports (2640), and information on the number of front load symbols (2650).
  • a value 2610
  • DMRS configuration type (2620)
  • information on the configuration of DMRS ports (2640
  • information on the number of front load symbols 2650.
  • the terminal may be newly defined only for the purpose of knowing the non-orthogonal DMRS port, and at this time, when the non-orthogonal DMRS port of FIG. 26 is indicated, the terminal can identify based on which orthogonal DMRS design the non-orthogonal DMRS port is indicated through the information (2620) about the Configuration Type of the table.
  • the example of FIG. 26 is only an example of configuring rows for indicating the non-orthogonal DMRS port to a single terminal of SU-MIMO, and the method of the present disclosure is not limited to the form illustrated in FIG. 26.
  • a terminal When a terminal is allocated a non-orthogonal DMRS port and its corresponding PDSCH, it can perform PDSCH channel estimation and equalization through various methods.
  • FIG. 27 is a diagram illustrating an example of a downlink non-orthogonal DMRS reception operation of a terminal according to various embodiments of the present disclosure.
  • the terminal may schedule a PDSCH from a base station and receive, on a PDCCH, a DCI including information (e.g., an antenna port(s) field) for indicating a non-orthogonal DMDRS port for PDSCH reception (2710).
  • the terminal may identify a non-orthogonal DMDRS port for PDSCCH reception based on the information for indicating a non-orthogonal DMDRS port included in the DCI received on the PDCCH, and may receive a PDSCH through the identified non-orthogonal DMDRS port (2720).
  • FIG. 28 is a diagram illustrating another example of a downlink non-orthogonal DMRS reception operation of a terminal according to various embodiments of the present disclosure. More specifically, FIG. 28 is a diagram regarding a case where an 8-layer non-orthogonal DMRS based on two non-orthogonal DMRS groups is transmitted to a terminal having eight antenna ports (2810, 2820).
  • a base station can indicate a non-orthogonal DMRS port using the antenna port(s) field present in DCI 1_1.
  • the terminal can perform channel estimation and equalization in parallel for each of the reception antenna ports associated with the non-orthogonal DMRS group indicated by the base station, and thereby decode a PDSCH. That is, when the terminal is assigned two non-orthogonal DMRS groups for eight antenna ports, the terminal can perform receiving operations in parallel for each of the four DMRS ports (2810, 2820) associated with each of the two non-orthogonal DMRS groups.
  • FIG. 29 is a flowchart illustrating an example of a method of operating a terminal according to various embodiments of the present disclosure.
  • the terminal can provide information related to the receiving antenna port of the terminal to the base station (2910).
  • the terminal can transmit capability information including information on the maximum number of demodulation reference signal (DMRS) groups that the terminal can support to the base station (2920).
  • DMRS demodulation reference signal
  • the terminal can receive configuration information including information on the number of DMRS groups set to the terminal from the base station (2930).
  • the terminal can receive, from the base station, at least one DMRS corresponding to the number of DMRS groups based on the configuration information, through different receiving antenna ports of the terminal each associated with the DMRS group (2940).
  • DMRS ports with the same or different port indices are set for each of the DMRS groups, and different initialization sequences for generating DMRS sequences can be applied to each of the DMRS groups.
  • FIG. 30 is a flowchart illustrating an example of a method of operating a base station according to various embodiments of the present disclosure.
  • the base station can receive information related to the receiving antenna port of the terminal from the terminal (3010).
  • the base station can receive capability information from the terminal, including information on the maximum number of demodulation reference signal (DMRS) groups that the terminal can support (3020).
  • DMRS demodulation reference signal
  • the base station can transmit configuration information including information on the number of DMRS groups set to the terminal to the terminal (3030).
  • the base station can transmit at least one DMRS corresponding to the number of DMRS groups based on the setting information to the terminal (3040).
  • each of the DMRS groups is associated with a different receiving antenna port of the terminal, DMRS ports having the same or different port indices are set for each of the DMRS groups, and different initialization sequences for generating DMRS sequences can be applied to each of the DMRS groups.
  • a computer-readable storage medium storing one or more programs (software modules) may be provided.
  • the one or more programs stored in the computer-readable storage medium are configured for execution by one or more processors in an electronic device.
  • the one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.
  • These programs may be stored in a random access memory, a non-volatile memory including a flash memory, a read only memory (ROM), an electrically erasable programmable read only memory (EEPROM), a magnetic disc storage device, a compact disc-ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage devices, a magnetic cassette. Or, they may be stored in a memory composed of a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.
  • ROM read only memory
  • EEPROM electrically erasable programmable read only memory
  • CD-ROM compact disc-ROM
  • DVDs digital versatile discs
  • each configuration memory may be included in multiple numbers.
  • the program may be stored in an attachable storage device that is accessible via a communications network, such as the Internet, an Intranet, a local area network (LAN), a wide area network (WAN), or a storage area network (SAN), or a combination thereof.
  • the storage device may be connected to the device performing an embodiment of the present disclosure via an external port. Additionally, a separate storage device on the communications network may be connected to the device performing an embodiment of the present disclosure.

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

Abstract

La présente divulgation porte sur un système de communication 5G ou 6G destiné à prendre en charge un débit de transmission de données supérieur à celui d'un système de communication 4G tel que LTE. Plus spécifiquement, un procédé mis en œuvre par un terminal dans un système de communication sans fil comprend les étapes consistant à : fournir des informations relatives à un port d'antenne de réception du terminal à une station de base ; transmettre, à la station de base, des informations de capacité comprenant des informations sur un nombre maximal de groupes de signaux de référence de démodulation (DMRS) que le terminal peut prendre en charge ; recevoir, en provenance de la station de base, des informations de configuration comprenant des informations sur un nombre de groupes DMRS configurés pour le terminal ; et recevoir, en provenance de la station de base, au moins un DMRS correspondant au nombre de groupes DMRS sur la base des informations de configuration par l'intermédiaire de différents ports d'antenne de réception du terminal associés à chacun des groupes DMRS. Les ports DMRS, attribués à des indices de port identiques ou différents, sont configurés pour chacun des groupes DMRS, et différentes séquences d'initialisation pour générer une séquence DMRS pouvent être appliquées à chacun des groupes DMRS.
PCT/KR2024/001182 2023-12-27 2024-01-25 Procédé et appareil de réception d'un signal de référence de liaison descendante dans un système de communication sans fil Pending WO2025143345A1 (fr)

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KR1020230192740A KR20250101278A (ko) 2023-12-27 2023-12-27 무선 통신 시스템에 있어서 하향링크 참조 신호를 수신하기 위한 방법 및 장치

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KR102312230B1 (ko) * 2017-03-25 2021-10-14 엘지전자 주식회사 무선 통신 시스템에서 참조 신호를 송수신하기 위한 방법 및 이를 위한 장치
KR20220038316A (ko) * 2017-03-23 2022-03-28 주식회사 아이티엘 Nr 시스템을 위한 복조 참조신호 패턴 설정 정보 송수신 방법 및 장치
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US20210168777A1 (en) * 2012-04-06 2021-06-03 Samsung Electronics Co., Ltd. Method and apparatus for transmitting/receiving channels in mobile communication system supporting massive mimo
KR20220038316A (ko) * 2017-03-23 2022-03-28 주식회사 아이티엘 Nr 시스템을 위한 복조 참조신호 패턴 설정 정보 송수신 방법 및 장치
KR102312230B1 (ko) * 2017-03-25 2021-10-14 엘지전자 주식회사 무선 통신 시스템에서 참조 신호를 송수신하기 위한 방법 및 이를 위한 장치
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