WO2025178452A1 - Procédé et dispositif de rapport de faisceau dans un système de communication sans fil - Google Patents

Procédé et dispositif de rapport de faisceau dans un système de communication sans fil

Info

Publication number
WO2025178452A1
WO2025178452A1 PCT/KR2025/099437 KR2025099437W WO2025178452A1 WO 2025178452 A1 WO2025178452 A1 WO 2025178452A1 KR 2025099437 W KR2025099437 W KR 2025099437W WO 2025178452 A1 WO2025178452 A1 WO 2025178452A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
beam report
information
reporting
beam reporting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/KR2025/099437
Other languages
English (en)
Korean (ko)
Inventor
홍의현
서영길
이정수
한진백
손혁민
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hyundai Motor Co
Industry Academic Cooperation Foundation of Gachon University
Kia Corp
Original Assignee
Hyundai Motor Co
Industry Academic Cooperation Foundation of Gachon University
Kia Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hyundai Motor Co, Industry Academic Cooperation Foundation of Gachon University, Kia Corp filed Critical Hyundai Motor Co
Priority claimed from KR1020250020633A external-priority patent/KR20250127723A/ko
Publication of WO2025178452A1 publication Critical patent/WO2025178452A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • 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
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • 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
    • H04W72/231—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 layers above the physical layer, e.g. RRC or MAC-CE signalling
    • 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

  • Communication networks are being developed to provide improved communication services compared to existing communication networks (e.g., long term evolution (LTE), advanced LTE-A (LTE-A), etc.).
  • 5G communication networks e.g., new radio (NR) communication networks
  • LTE long term evolution
  • LTE-A advanced LTE-A
  • 5G communication networks can support frequency bands above 6 GHz as well as frequency bands below 6 GHz. That is, 5G communication networks can support FR1 bands and/or FR2 bands.
  • 5G communication networks can support various communication services and scenarios compared to LTE communication networks. For example, usage scenarios of 5G communication networks can include enhanced Mobile Broadband (eMBB), Ultra Reliable Low Latency Communication (URLLC), massive Machine Type Communication (mMTC), etc.
  • eMBB enhanced Mobile Broadband
  • URLLC Ultra Reliable Low Latency Communication
  • mMTC massive Machine Type Communication
  • 6G communication networks can support a wider range of communication services and scenarios.
  • 6G communication networks can meet requirements for ultra-high performance, ultra-high bandwidth, ultra-high space, ultra-high precision, ultra-intelligence, and/or ultra-reliability.
  • 6G communication networks can support diverse and wide frequency bands and be applied to various usage scenarios (e.g., terrestrial communications, non-terrestrial communications, sidelink communications, etc.).
  • Beam management for TRP in 5G NR can be defined as a set of L1/L2 procedures that find or maintain the optimal beam required for transmission/reception of each TRP and UE.
  • a transmission configuration index (TCI) has been introduced to configure the UE's reception beam for a specific channel/signal, such as PDSCH/CSI-RS/PDCCH.
  • TCI was introduced to dynamically indicate quasi-colocation (QCL) information through downlink control information (DCI) at the base station.
  • the technology that serves as the background for the invention is written to promote understanding of the background for the invention, and may include content that is not a prior art already known to a person with ordinary skill in the field to which the technology belongs.
  • the present disclosure may provide a device and method for performing UI/ED (user equipment-initiated/event-driven) beam reporting.
  • UI/ED user equipment-initiated/event-driven
  • the present disclosure may provide a device and method for indicating activation or deactivation of UI/ED beam reporting.
  • a method of operating a terminal in a wireless communication system may include the steps of establishing a connection with a base station, receiving an RRC (radio resource control) configuration message including configuration information for a UI/ED (user equipment-initiated/event-driven)-based beam report from the base station, receiving at least one reference signal from the base station, determining triggering for a beam report based on the configuration information and a measurement result of the at least one reference signal, and transmitting a beam report message to the base station in response to the triggering.
  • RRC radio resource control
  • a method of operating a base station in a wireless communication system includes the steps of establishing a connection with a terminal, transmitting an RRC (radio resource control) configuration message including configuration information for a UI/ED (user equipment-initiated/event-driven)-based beam report to the terminal, transmitting at least one reference signal to the terminal, and receiving a beam report message generated based on a measurement result for the at least one reference signal from the terminal, wherein the beam report message can be transmitted by a beam report being triggered by the terminal based on the configuration information and the measurement result of the at least one reference signal.
  • RRC radio resource control
  • a terminal may include at least one transceiver, at least one processor, and at least one memory operably connected to the at least one processor and storing instructions that, when executed by the processor, control the terminal to perform operations, wherein the operations may include: establishing a connection with a base station; receiving an RRC (radio resource control) configuration message including configuration information for a UI/ED (user equipment-initiated/event-driven)-based beam report from the base station; receiving at least one reference signal from the base station; determining triggering for a beam report based on the configuration information and a measurement result of the at least one reference signal; and transmitting a beam report message to the base station in response to the triggering.
  • RRC radio resource control
  • a method of operating a terminal in a wireless communication system includes, in a base station in the wireless communication system, at least one transceiver, at least one processor, and at least one memory operably connected to the at least one processor and storing instructions that, when executed by the processor, control the base station to perform operations, the operations including: establishing a connection with a terminal; transmitting an RRC (radio resource control) configuration message including configuration information for a UI/ED (user equipment-initiated/event-driven)-based beam report to the terminal; transmitting at least one reference signal to the terminal; and receiving a beam report message generated based on a measurement result for the at least one reference signal from the terminal, wherein the beam report message can be transmitted by a beam report being triggered by the terminal based on the configuration information and a measurement result for the at least one reference signal.
  • RRC radio resource control
  • UI/ED user equipment-initiated/event-driven beam reporting can be efficiently performed in a wireless communication system.
  • Figure 3 is a block diagram illustrating an embodiment of wireless devices performing communication.
  • Figure 4b is a block diagram illustrating an embodiment of a receiving path.
  • Figure 5 is a conceptual diagram illustrating an embodiment of a system frame in a communication system.
  • Figure 6 is a conceptual diagram illustrating an embodiment of a subframe in a communication system.
  • Figure 8 is a conceptual diagram illustrating an embodiment of time-frequency resources in a communication system.
  • Figure 9 illustrates an example of a QCL relationship between reference signals applicable to the present disclosure.
  • FIG. 10 illustrates an example of a procedure for integrating and setting a beam for multiple channels or reference signals through a unified TCI state according to one embodiment of the present disclosure.
  • FIG. 12 illustrates a first embodiment of a UI/ED beam reporting procedure according to one embodiment of the present disclosure.
  • FIG. 15 illustrates a fourth embodiment of a UI/ED beam reporting procedure according to one embodiment of the present disclosure.
  • FIG. 22 illustrates an example of a procedure for a terminal to perform UI/ED beam reporting according to one embodiment of the present disclosure.
  • (re)transmission may mean “transmission,” “retransmission,” or “transmission and retransmission”
  • (re)setting may mean “setting,” “resetting,” or “setting and resetting”
  • (re)connection may mean “connection,” “reconnection,” or “connection and reconnection,” and (re)connection may mean “connection,” “reconnection,” or “connection and reconnection.”
  • At least one control unit (210) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer.
  • the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in the present disclosure may be implemented using firmware or software in the form of codes, instructions, and/or a set of instructions.
  • the firmware or software may execute another program stored in a memory (220), such as an OS.
  • the control unit (210) may be implemented to support beamforming or directional routing operations in which signals from at least one antenna (270) are weighted differently to effectively steer signals outgoing in a desired direction.
  • the communication system (100) may include a plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) and a plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6).
  • Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) may form a macro cell.
  • Each of the fourth base station (120-1) and the fifth base station (120-2) may form a small cell.
  • the fourth base station (120-1), the third terminal (130-3), and the fourth terminal (130-4) may be within the cell coverage of the first base station (110-1).
  • Each of the plurality of terminals may be referred to as a user equipment (UE), terminal equipment (TE), advanced mobile station (AMS), high reliability-mobile station (HR-MS), terminal, access terminal, mobile terminal, station, subscriber station, mobile station, portable subscriber station, node, device, on board unit (OBU), etc.
  • UE user equipment
  • TE terminal equipment
  • AMS advanced mobile station
  • HR-MS high reliability-mobile station
  • OBU on board unit
  • Each of the plurality of base stations can transmit a signal received from the core network to the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6), and can transmit a signal received from the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) to the core network.
  • each of the plurality of base stations may support MIMO transmission (e.g., single user (SU)-MIMO, multi user (MU)-MIMO, massive MIMO, etc.), coordinated multipoint (CoMP) transmission, carrier aggregation (CA) transmission, transmission in an unlicensed band, sidelink communication (e.g., device to device communication (D2D), proximity services (ProSe)), Internet of Things (IoT) communication, dual connectivity (DC), etc.
  • MIMO transmission e.g., single user (SU)-MIMO, multi user (MU)-MIMO, massive MIMO, etc.
  • CoMP coordinated multipoint
  • CA carrier aggregation
  • sidelink communication e.g., device to device communication (D2D), proximity services (ProSe)
  • IoT Internet of Things
  • DC dual connectivity
  • each of the plurality of terminals can perform an operation corresponding to the base station (110-1, 110-2, 110-3, 120-1, 120-2) and an operation supported by the base station (110-1, 110-2, 110-3, 120-1, 120-2).
  • the second base station (110-2) can transmit a signal to the fourth terminal (130-4) based on the SU-MIMO scheme
  • the fourth terminal (130-4) can receive a signal from the second base station (110-2) by the SU-MIMO scheme.
  • the second base station (110-2) can transmit signals to the fourth terminal (130-4) and the fifth terminal (130-5) based on the MU-MIMO method, and each of the fourth terminal (130-4) and the fifth terminal (130-5) can receive signals from the second base station (110-2) based on the MU-MIMO method.
  • Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can transmit a signal to the fourth terminal (130-4) based on the CoMP scheme, and the fourth terminal (130-4) can receive a signal from the first base station (110-1), the second base station (110-2), and the third base station (110-3) based on the CoMP scheme.
  • Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can transmit and receive a signal with terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) within its cell coverage based on the CA scheme.
  • Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can control sidelink communication between the fourth terminal (130-4) and the fifth terminal (130-5), and each of the fourth terminal (130-4) and the fifth terminal (130-5) can perform sidelink communication under the control of the second base station (110-2) and the third base station (110-3), respectively.
  • communication nodes performing communication in a communication network may be configured as follows.
  • the communication node illustrated in FIG. 3 may be a specific embodiment of the wireless device illustrated in FIG. 2.
  • Figure 3 is a block diagram illustrating an embodiment of wireless devices performing communication.
  • each of the first wireless device (300a) and the second wireless device (300b) may be a base station or a UE.
  • the first wireless device (300a) may transmit a signal to the second wireless device (300b).
  • the transmission processor (311) included in the first wireless device (300a) may receive data (e.g., a data unit) from a data source (310).
  • the transmission processor (311) may receive control information from the controller (316).
  • the control information may include at least one of system information, RRC configuration information (e.g., information set by RRC signaling), MAC control information (e.g., MAC CE), or PHY control information (e.g., DCI, SCI).
  • the transmitting processor (311) may perform a processing operation on data (e.g., an encoding operation, a symbol mapping operation, etc.) to generate data symbol(s).
  • the transmitting processor (311) may perform a processing operation on control information (e.g., an encoding operation, a symbol mapping operation, etc.) to generate control symbol(s).
  • the transmitting processor (311) may generate synchronization/reference symbol(s) for a synchronization signal and/or a reference signal.
  • the Tx MIMO processor (312) may perform a spatial processing operation (e.g., a precoding operation) on data symbol(s), control symbol(s), and/or synchronization/reference symbol(s).
  • the output (e.g., a symbol stream) of the Tx MIMO processor (312) may be provided to modulators (MODs) included in the transceivers (313a to 313t).
  • the modulators (MODs) may perform a processing operation on the symbol stream to generate modulation symbols, and may perform an additional processing operation (e.g., an analog conversion operation, an amplification operation, a filtering operation, an upconversion operation) on the modulation symbols to generate signals.
  • the signals generated by the modulators (MODs) of the transceivers (313a to 313t) may be transmitted via the antennas (314a to 314t).
  • Signals transmitted by the first wireless device (300a) may be received by the antennas (364a to 364r) of the second wireless device (300b).
  • the signals received by the antennas (364a to 364r) may be provided to demodulators (DEMODs) included in the transceivers (363a to 363r).
  • the demodulator (DEMOD) may perform a processing operation (e.g., a filtering operation, an amplification operation, a downconversion operation, a digital conversion operation) on the signal to obtain samples.
  • the demodulator (DEMOD) may perform an additional processing operation on the samples to obtain symbols.
  • the MIMO detector (362) may perform a MIMO detection operation on the symbols.
  • the receiving processor (361) may perform a processing operation (e.g., a deinterleaving operation, a decoding operation) on the symbols.
  • the output of the receiving processor (361) may be provided to a data sink (360) and a controller (366).
  • data may be provided to the data sink (360), and control information may be provided to the controller (366).
  • the second wireless device (300b) can transmit a signal to the first wireless device (300a).
  • the transmitting processor (368) included in the second wireless device (300b) can receive data (e.g., data units) from a data source (367) and perform a processing operation on the data to generate data symbol(s).
  • the transmitting processor (368) can receive control information from the controller (366) and perform a processing operation on the control information to generate control symbol(s).
  • the transmitting processor (368) can perform a processing operation on a reference signal to generate reference symbol(s).
  • the Tx MIMO processor (369) may perform spatial processing operations (e.g., precoding operations) on data symbol(s), control symbol(s), and/or reference symbol(s).
  • the output (e.g., symbol stream) of the Tx MIMO processor (369) may be provided to modulators (MODs) included in the transceivers (363a to 363t).
  • the modulators (MODs) may perform processing operations on the symbol streams to generate modulation symbols, and may perform additional processing operations (e.g., analog conversion operations, amplification operations, filtering operations, upconversion operations) on the modulation symbols to generate signals.
  • the signals generated by the modulators (MODs) of the transceivers (363a to 363t) may be transmitted via the antennas (364a to 364t).
  • Signals transmitted by the second wireless device (300b) may be received by the antennas (314a to 314r) of the first wireless device (300a).
  • the signals received by the antennas (314a to 314r) may be provided to demodulators (DEMODs) included in the transceivers (313a to 313r).
  • the demodulator (DEMOD) may perform a processing operation (e.g., a filtering operation, an amplification operation, a downconversion operation, a digital conversion operation) on the signal to obtain samples.
  • the demodulator (DEMOD) may perform an additional processing operation on the samples to obtain symbols.
  • the MIMO detector (320) may perform a MIMO detection operation on the symbols.
  • the receiving processor (319) may perform a processing operation (e.g., a deinterleaving operation, a decoding operation) on the symbols.
  • the output of the receiving processor (319) may be provided to a data sink (318) and a controller (316).
  • data may be provided to the data sink (318) and control information may be provided to the controller (316).
  • Memories (315 and 365) can store data, control information, and/or program code.
  • Scheduler (317) can perform scheduling operations for communication.
  • the processors (311, 312, 319, 361, 368, 369) and controllers (316, 366) illustrated in FIG. 3 may be the processor (210) illustrated in FIG. 2 and may be used to perform the methods described in the present disclosure.
  • Fig. 4a is a block diagram illustrating an embodiment of a transmission path
  • Fig. 4b is a block diagram illustrating an embodiment of a reception path.
  • a transmission path (410) may be implemented in a communication node that transmits a signal
  • a reception path (420) may be implemented in a communication node that receives a signal.
  • the transmission path (410) may include a channel coding and modulation block (411), an S-to-P (serial-to-parallel) block (512), an N IFFT (Inverse Fast Fourier Transform) block (413), a P-to-S (parallel-to-serial) block (414), a CP (cyclic prefix) addition block (415), and an UC (up-converter) (UC) (416).
  • the receiving path (420) may include a DC (down-converter) (421), a CP removal block (422), an S-to-P block (423), an N FFT block (424), a P-to-S block (425), and a channel decoding and demodulation block (426).
  • N may be a natural number.
  • information bits may be input to a channel coding and modulation block (411).
  • the channel coding and modulation block (411) may perform a coding operation (e.g., a low-density parity check (LDPC) coding operation, a polar coding operation, etc.) and a modulation operation (e.g., a quadrature phase shift keying (QPSK), a quadrature amplitude modulation (QAM), etc.) on the information bits.
  • LDPC low-density parity check
  • QPSK quadrature phase shift keying
  • QAM quadrature amplitude modulation
  • the output of the channel coding and modulation block (411) may be a sequence of modulation symbols.
  • the S-to-P block (412) can convert modulation symbols in the frequency domain into parallel symbol streams to generate N parallel symbol streams.
  • N can be an IFFT size or an FFT size.
  • the N IFFT block (413) can perform an IFFT operation on the N parallel symbol streams to generate signals in the time domain.
  • the P-to-S block (414) can convert the output (e.g., parallel signals) of the N IFFT block (413) into a serial signal to generate a serial signal.
  • a signal transmitted from a transmission path (410) may be input to a reception path (420).
  • An operation in the reception path (420) may be the reverse operation of the operation in the transmission path (410).
  • a DC (421) may down-convert the frequency of the received signal to a baseband frequency.
  • a CP removal block (422) may remove a CP from a signal. The output of the CP removal block (422) may be a serial signal.
  • An S-to-P block (423) may convert the serial signal into parallel signals.
  • An N FFT block (424) may perform an FFT algorithm to generate N parallel signals.
  • a P-to-S block (425) may convert the parallel signals into a sequence of modulation symbols.
  • a channel decoding and demodulation block (426) may perform a demodulation operation on the modulation symbols and perform a decoding operation on the result of the demodulation operation to restore data.
  • Discrete Fourier Transform (DFT) and Inverse DFT (IDFT) may be used instead of FFT and IFFT.
  • DFT Discrete Fourier Transform
  • IDFT Inverse DFT
  • Each of the blocks (e.g., components) in FIGS. 4A and 4B may be implemented by at least one of hardware, software, or firmware.
  • some of the blocks in FIGS. 4A and 4B may be implemented by software, and the remaining blocks may be implemented by hardware or a “combination of hardware and software.”
  • a block may be subdivided into multiple blocks, multiple blocks may be integrated into a single block, some blocks may be omitted, and blocks supporting other functions may be added.
  • Figure 5 is a conceptual diagram illustrating an embodiment of a system frame in a communication system.
  • time resources in a communication system can be divided into frame units.
  • system frames can be set consecutively in the time domain of the communication system.
  • the length of a system frame can be 10 ms (milliseconds).
  • the system frame number (SFN) can be set from #0 to #1023.
  • 1024 system frames can be repeated in the time domain of the communication system.
  • the SFN of the system frame after system frame #1023 can be #0.
  • a system frame may include two half frames.
  • a half frame may be 5 ms long.
  • a half frame located at the beginning of the system frame may be referred to as "half frame #0,” and a half frame located at the end of the system frame may be referred to as "half frame #1.”
  • a system frame may include 10 subframes.
  • a subframe may be 1 ms long. The 10 subframes within a system frame may be referred to as "subframes #0-9.”
  • Figure 6 is a conceptual diagram illustrating an embodiment of a subframe in a communication system.
  • one subframe may include n slots, where n may be a natural number. Accordingly, one subframe may be composed of one or more slots.
  • Figure 7 is a conceptual diagram illustrating an embodiment of a slot in a communication system.
  • a single slot may include one or more symbols.
  • a single slot illustrated in Figure 7 may include 14 symbols.
  • the length of a slot may vary depending on the number and length of symbols contained in the slot. Alternatively, the length of a slot may vary depending on the numerology.
  • the numerology applied to physical signals and channels may be variable.
  • the numerology may be variable to meet various technical requirements of the communication system.
  • the numerology may include subcarrier spacing and CP length (or CP type).
  • Table 1 may be an embodiment of a method for configuring a numerology for a CP-OFDM-based communication system. At least some of the numerologies in Table 1 may be supported depending on the frequency band in which the communication system operates. In addition, the communication system may additionally support numerologies not listed in [Table 1].
  • the slot format can be semi-statically configured by higher layer signaling (e.g., RRC signaling).
  • Information indicating the semi-static slot format can be included in the system information, and the semi-static slot format can be configured cell-specifically.
  • the semi-static slot format can be additionally configured for each terminal through terminal-specific higher layer signaling (e.g., RRC signaling).
  • the flexible symbol of the cell-specifically configured slot format can be overridden to a downlink symbol or an uplink symbol by terminal-specific higher layer signaling.
  • the slot format can be dynamically indicated by physical layer signaling (e.g., a slot format indicator (SFI) included in DCI).
  • SFI slot format indicator
  • the semi-statically configured slot format can be overridden by a dynamically indicated slot format.
  • the semi-statically configured flexible symbol can be overridden to a downlink symbol or an uplink symbol by the SFI.
  • the reference signal may be a channel state information-reference signal (CSI-RS), a sounding reference signal (SRS), a demodulation-reference signal (DM-RS), a phase tracking-reference signal (PT-RS), etc.
  • the channel may be a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), etc.
  • the control channel may mean a PDCCH, a PUCCH, or a PSCCH
  • the data channel may mean a PDSCH, a PUSCH, or a PSSCH.
  • Figure 8 is a conceptual diagram illustrating an embodiment of time-frequency resources in a communication system.
  • a resource consisting of one symbol (e.g., an OFDM symbol) in the time domain and one subcarrier in the frequency domain may be defined as a "RE (resource element)".
  • Resources consisting of one OFDM symbol in the time domain and K subcarriers in the frequency domain may be defined as a "REG (resource element group)".
  • a REG may include K REs.
  • a REG may be used as a basic unit for resource allocation in the frequency domain.
  • K may be a natural number.
  • K may be 12.
  • N may be a natural number.
  • N may be 14.
  • N OFDM symbols may be used as a basic unit for resource allocation in the time domain.
  • RB may mean CRB (common RB).
  • RB may mean PRB or VRB (virtual RB).
  • CRB may mean RB that constitutes a set of consecutive RBs (e.g., a common RB grid) based on a reference frequency (e.g., point A).
  • Carriers and/or bandwidth portions may be arranged on the common RB grid. That is, the carrier and/or bandwidth portions may be composed of CRB(s).
  • RBs or CRBs that constitute the bandwidth portions may be referred to as PRBs, and within the bandwidth portions, the CRB index may be appropriately converted to the PRB index.
  • Downlink data can be transmitted via the PDSCH.
  • the base station can transmit PDSCH configuration information (e.g., scheduling information) to the terminal via the PDCCH.
  • the terminal can obtain the PDSCH configuration information by receiving the PDCCH (e.g., downlink control information (DCI)).
  • the PDSCH configuration information can include the MCS (modulation coding scheme) used for transmitting and receiving the PDSCH, time resource information of the PDSCH, frequency resource information of the PDSCH, feedback resource information for the PDSCH, etc.
  • the PDSCH can refer to a radio resource through which downlink data is transmitted and received. Alternatively, the PDSCH can refer to the downlink data itself.
  • the PDCCH can refer to a radio resource through which downlink control information (e.g., DCI) is transmitted and received. Alternatively, the PDCCH can refer to the downlink control information itself.
  • a terminal can perform a monitoring operation on the PDCCH to receive a PDSCH transmitted from a base station.
  • the base station can inform the terminal of the configuration information for the PDCCH monitoring operation using a higher layer message (e.g., an RRC (radio resource control) message).
  • the configuration information for the PDCCH monitoring operation can include CORESET (control resource set) information and search space information.
  • the CORESET information may include PDCCH DMRS (demodulation reference signal) information, PDCCH precoding information, PDCCH opportunity information, etc.
  • the PDCCH DMRS may be a DMRS used to demodulate the PDCCH.
  • the PDCCH opportunity may be a region where the PDCCH can exist. In other words, the PDCCH opportunity may be a region where DCI can be transmitted.
  • the PDCCH opportunity may be referred to as a PDCCH candidate.
  • the PDCCH opportunity information may include time resource information and frequency resource information of the PDCCH opportunity. In the time domain, the length of the PDCCH opportunity may be indicated in symbol units. In the frequency domain, the size of the PDCCH opportunity may be indicated in RB units (e.g., in PRB (physical resource block) units or CRB (common resource block) units).
  • CJT Coherent Joint Transmission
  • NCJT Non-Coherent Joint Transmission
  • the CJT method allows two or more TRPs to cooperate in a synchronized manner to support data transmission to a single terminal based on a stable backhaul link between base stations connected to the TRPs.
  • the NCJT method allows two or more TRPs to decide scheduling, precoding matrix selection, modulation, and coding schemes without cooperation between the TRPs in a situation where two or more TRPs support a single terminal.
  • Beam management for TRP in 5G NR can be defined as a set of L1/L2 procedures that find or maintain the optimal beam required for transmission/reception at each TRP and terminal. Beam management procedures can be broadly categorized into four categories, as follows:
  • the TRP and the UE can utilize the reciprocity characteristics of the downlink (DL)/uplink (UL) channels when managing beams.
  • the UE can utilize the values measured in the receive beams (Rx beams) of the DL channel when configuring the transmit beam (Tx beam).
  • the UE can utilize the values measured in the transmit beams (Tx beams) of the UL channel when configuring the receive beam (Rx beam).
  • TCI transmission configuration indicator
  • TCI transmission configuration indicator
  • the TCI can be used to configure a beam to be used for transmission of a specific channel and/or signal, for example, PDSCH and/or CSI-RS and/or PDCCH.
  • the base station can dynamically indicate quasi-colocation (QCL) information to the UE by transmitting TCI through downlink control information (DCI).
  • QCL quasi-colocation
  • the terminal can use the TCI state as follows using the received DCI.
  • the UE may assume that the DM-RS antenna ports for PDCCH reception in the first and second coresets and the DM-RS antenna ports for PDSCH reception scheduled by the DCI formats provided by PDCCH reception in the first and second coresets are in a QCL relationship with the reference signals provided by the TCI states specific to the first and second CORESETs, respectively. Furthermore, the UE may transmit the PUSCH scheduled by the DCI formats provided by PDCCH reception in the first and second CORESETs, respectively, using the spatial domain filters corresponding to the TCI states specific to the first and second CORESETs, respectively.
  • the TCI state can be used to transmit uplink signals.
  • the terminal can use the following procedures to control uplink power.
  • Uplink power control can be used to determine power for PUSCH, PUCCH, SRS, or PRACH transmissions.
  • the UE may be configured not to maintain more than four path loss estimates simultaneously for PUSCH/PUCCH/SRS transmissions per serving cell.
  • a transmission opportunity can be defined by a slot index within a frame, the first symbol within the slot, and the number of consecutive symbols. If the UE receives TCI states in dl-OrJointTCI-StateList, an RS index for downlink path loss estimation for PUSCH, PUCCH, or SRS transmission can be provided for each one or both TCI states for PUSCH, PUCCH, or SRS transmission opportunities.
  • Power control values can be set explicitly or implicitly. For example, if followUnifiedTCI-StateSRS is set, power control values are provided from p0AlphaSetforSRS associated with the TCI state. If followUnifiedTCI-StateSRS is not set, power control values and an RS index for path loss estimation can be provided from the TCI state associated with the SRS resource with the lowest SRS-ResourceId. In this case, the overall SRS power value can be determined based on the sum of individual SRS power control values and additional components according to the SRS resource set.
  • the terminal may perform an initial cell search operation with the base station.
  • the terminal may perform monitoring to receive a synchronization signal.
  • the synchronization signal may be at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the terminal may receive a physical broadcast channel (PBCH) signal from the base station to obtain broadcast information within the cell. Based on the physical broadcast channel, the terminal may obtain information about the cell using at least one of the MIB or SIB.
  • PBCH physical broadcast channel
  • a block including all of the PSS, SSS, and PBCH may be referred to as a synchronization signal block (SSB).
  • SSB synchronization signal block
  • a terminal can perform a random access procedure.
  • the terminal can transmit a preamble to the base station and receive a random access response (RAR) from the base station.
  • the RAR message can include a temporary identifier.
  • the terminal can transmit MSG3 (or an RRC connection request message) using the scheduling information in the RAR, and the base station can perform a contention resolution procedure by transmitting MSG4 (or a contention resolution message) to the terminal in response to MSG3.
  • the base station can perform beam management based on the RACH opportunity used for preamble transmission in the random access procedure. For example, the base station can determine the beam on which the terminal received the synchronization signal based on the RACH opportunity in which the preamble was transmitted. As described above, a synchronization signal can also be included as a reference signal for indicating the QCL relationship, and the QCL relationship can be established based on the SSB received through the initial access procedure.
  • a channel measurement procedure may be performed for beam management.
  • the terminal may receive a reference signal from the base station. Based on this, the terminal may report channel state information (CSI) to the base station.
  • the channel state information may include at least one of reference signal received power (RSRP), reference signal received quality (RSRQ), and signal-to-noise ratio (SNR).
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • SNR signal-to-noise ratio
  • the base station may use the received channel state information to adjust beamforming for the terminal or optimize radio resource allocation.
  • the base station may transmit configuration information for channel measurement to the terminal.
  • the configuration information for channel measurement may include information related to a measurement target, a measurement cycle, and the like.
  • Base station and terminal beam settings can be managed through artificial intelligence (AI).
  • beam set B refers to the beam set where measurements are performed using AI/ML model input
  • beam set A refers to the beam set determined based on AI/ML model inference.
  • Beam sets A and B may contain beam information for the same frequency range.
  • Artificial intelligence can be used to infer spatial domain downlink beams for beam set A based on measurements of beam set B.
  • artificial intelligence can be used to infer temporal downlink beams for beam set A based on past measurements of beam set B.
  • beam set A and beam set B may be different sets, or beam set B may be a subset of beam set A.
  • the input of the artificial intelligence model can be formed from various combinations.
  • the input of the artificial intelligence can include at least one of an L1-RSRP measurement based on beam set B, other auxiliary information, a channel impulse response (CIR) based on beam set B, and a downlink Tx/Rx beam ID associated with the L1-RSRP measurement of beam set B.
  • CIR channel impulse response
  • the aforementioned artificial intelligence model can be designed to infer a beam including at least one of a downlink reception beam and a downlink transmission beam.
  • the output of the artificial intelligence model can include at least one of a transmission beam, a reception beam, an L1-RSRP of the transmission beam, an L1-RSRP of the reception beam, an angle of the transmission beam, an angle of the reception beam, and other information.
  • FIG. 12 illustrates a first embodiment of a UI/ED beam reporting procedure according to one embodiment of the present disclosure.
  • FIG. 12 illustrates a procedure in which a UE receives a configuration message for UI/ED beam reporting from a gNB, a TRP, or a NW.
  • a base station may be understood as a gNB, a NW, or a TRP.
  • the base station transmits an RRC configuration message, and the UE receives the RRC configuration message.
  • the UE can receive a configuration message required for UI/ED beam reporting through the RRC configuration.
  • the RRC configuration message may include one message or multiple messages, and the configuration information included in the RRC configuration message may include at least one of the following items.
  • the event can be predefined or configured via an RRC message.
  • At least one event can be configured via an RRC message.
  • the UE can determine the UI/ED beam reporting operation based on at least one event.
  • the UE receives reference signals.
  • the reference signals can be transmitted according to RRC configuration information. Accordingly, the UE performs measurements on the received reference signals based on the RRC configuration information.
  • the UE transmits a UI/ED beam report message. That is, the UI/ED beam report message may be transmitted in response to a UI/ED beam report being triggered by the satisfaction of an event.
  • the UI/ED beam report message may include information about the beam, including the BSI.
  • Activation of UI/ED beam reporting can be understood as a transition of the UE to a state in which it can report beam-related information when a specific event is satisfied.
  • Deactivation of UI/ED beam reporting can be understood as a transition of the UE to a state in which it cannot perform UI/ED beam reporting regardless of whether a specific event is satisfied.
  • the UI/ED beam reporting operation can be performed without separate activation or deactivation after RRC configuration for UI/ED beam reporting.
  • the base station can reconfigure or change the UI/ED beam reporting configuration through RRC reconfiguration.
  • the UI/ED beam reporting operation can be activated by RRC configuration for UI/ED beam reporting and deactivated by deactivation signaling.
  • the deactivation indication can be signaled via MAC-CE or DCI.
  • FIG. 13 illustrates a second embodiment of a UI/ED beam reporting procedure according to one embodiment of the present disclosure.
  • a base station may be understood as a gNB, a NW, or a TRP.
  • the UE receives reference signals.
  • the reference signals can be transmitted according to RRC configuration information. Accordingly, the UE performs measurements on the received reference signals based on the RRC configuration information.
  • step S1305 the UE determines whether a beam report is triggered by a configured event. If the measurement results for the reference signals satisfy the configured event, the UI/ED beam report is triggered, and the UE can report the configured BSI via the PUCCH or PUSCH configured according to the RRC configuration.
  • the UE receives an RRC configuration message or an RRC reconfiguration message.
  • the UE may receive a configuration or instruction to re-enable UI/ED beam reporting via the RRC reconfiguration message.
  • the instruction for activation is not limited to being conveyed in the RRC configuration message or the RRC reconfiguration message, but may also be conveyed via other signaling.
  • activation of UI/ED beam reporting may be indicated via MAC-CE or DCI.
  • FIG. 14 illustrates a third embodiment of a UI/ED beam reporting procedure according to one embodiment of the present disclosure.
  • signaling operations for activating/deactivating UI/ED beam reporting can be understood.
  • a base station may be understood as a gNB, a NW, or a TRP.
  • step S1401 the base station transmits an RRC configuration message, and the UE receives the RRC configuration message.
  • the UE can receive a configuration message required for UI/ED beam reporting through the RRC configuration.
  • the RRC configuration message may be composed of one message or multiple messages.
  • the UE receives reference signals.
  • the reference signals can be transmitted according to RRC configuration information. Accordingly, the UE performs measurements on the received reference signals based on the RRC configuration information.
  • step S1405 the UE determines UI/ED beam reporting triggering based on the configured event. If the measurement results for the reference signals satisfy the configured event, the UI/ED beam reporting is triggered, and the UE can report the configured BSI via the PUCCH or PUSCH configured according to the RRC configuration.
  • the UE receives an activation signal for UI/ED beam reporting.
  • the UI/ED beam reporting operation can be activated in response to the activation signal. Accordingly, the UE transitions to a state capable of performing UI/ED beam reporting. Accordingly, when a reference signal is received, it is possible to determine whether an event is satisfied.
  • the activation indication can be signaled via MAC-CE or DCI.
  • step S1501 the base station transmits an RRC configuration message, and the UE receives the RRC configuration message.
  • the UE can receive configuration information required for UI/ED beam reporting through the RRC configuration message.
  • the RRC configuration message may be composed of one message or multiple messages.
  • step S1503 the UE receives an activation signal for UI/ED beam reporting.
  • the UE may be instructed to activate UI/ED beam reporting based on MAC-CE or DCI.
  • the activation signal transitions the UE to a state capable of performing UI/ED beam reporting.
  • whether to transmit the reference signal may be determined by the activation/deactivation of the UI/ED beam reporting based on MAC-CE or DCI. That is, after the activation based on MAC-CE or DCI, the transmission of the reference signal may be possible.
  • the periodic reference signal resource configuration and UL channel configuration information for UI/ED beam reporting the reference signal is transmitted regardless of the activation/deactivation of the UI/ED beam reporting based on the RRC configuration information, and only the activation/deactivation of the UI/ED beam reporting may be indicated based on MAC-CE or DCI.
  • the UE receives an RRC configuration message.
  • the UE can receive a configuration message required for UI/ED beam reporting through the RRC configuration.
  • the RRC configuration message may be composed of one message or multiple messages.
  • the UE receives reference signals.
  • the reference signals may be transmitted according to RRC configuration information.
  • the reference signals may be configured for aperiodic transmission and may be transmitted in response to activation of UI/ED beam reporting. Accordingly, the UE performs measurements on the received reference signals based on the RRC configuration information.
  • the UE transmits a UI/ED beam report message. That is, the UI/ED beam report message may be transmitted in response to a UI/ED beam report being triggered by the satisfaction of an event.
  • the UI/ED beam report message may include information about the beam, including the BSI.
  • the UE receives reference signals.
  • the reference signals can be transmitted according to RRC configuration information. Accordingly, the UE performs measurements on the received reference signals based on the RRC configuration information.
  • the UE transmits a UI/ED beam report. That is, the UI/ED beam report message may be transmitted in response to a UI/ED beam report being triggered by the satisfaction of an event.
  • the UI/ED beam report message may include information about the beam, including the BSI.
  • the UE receives a deactivation signal for UI/ED beam reporting.
  • Deactivation of UI/ED beam reporting can be indicated based on MAC/CE or DCI. If deactivation signaling is performed while UI/ED beam reporting operation is enabled, the UI/ED beam reporting operation is deactivated, and the existing NW-initiated periodic CSI reporting procedure is activated.
  • step S1717 the UE receives reference signals.
  • the reference signals can be transmitted according to RRC configuration information. Accordingly, the UE performs measurements on the received reference signals based on the RRC configuration information.
  • the base station transmits an RRC configuration message, and the UE receives the RRC configuration message.
  • the RRC configuration message may include configuration information regarding NW-initiated semi-persistent beam reporting.
  • step S1803 the UE receives an activation signal for NW-initiated semi-static beam reporting.
  • the activation signal may be indicated based on MAC-CE or DCI. Accordingly, the UE transitions to a state capable of performing NW-initiated semi-static beam reporting.
  • step S1805 the UE receives reference signals, which can be transmitted according to RRC configuration information. Accordingly, the UE performs measurements on the received reference signals based on the RRC configuration information.
  • the UE transmits a NW-initiated semi-static beam report.
  • the NW-initiated beam report may include information about the channel quality measured using the reference signal.
  • the NW-initiated beam report may be performed semi-statically.
  • step S1809 the UE receives an activation signal for UI/ED beam reporting.
  • the UE may be instructed to activate UI/ED beam reporting based on MAC-CE or DCI.
  • the semi-static reporting procedure is deactivated or suspended, and the UI/ED beam reporting operation is activated based on the information contained in the RRC configuration message.
  • step S1813 the UE determines UI/ED beam reporting triggering based on the configured event. If the measurement results for the reference signals satisfy the configured event, the UI/ED beam reporting is triggered, and the UE may report the configured BSI via the PUCCH or PUSCH configured according to the RRC configuration. If the measurement results do not satisfy the configured event, the UI/ED beam reporting may not be performed.
  • the UE transmits a UI/ED beam report message. That is, the UI/ED beam report message may be transmitted in response to a UI/ED beam report being triggered by the satisfaction of an event.
  • the UI/ED beam report message may include information about the beam, including the BSI.
  • the UE receives reference signals.
  • the reference signals can be transmitted according to RRC configuration information. Accordingly, the UE performs measurements on the received reference signals based on the RRC configuration information.
  • step S1907 the UE determines UI/ED beam reporting triggering based on the configured event. If the measurement results for the reference signals satisfy the configured event, the UI/ED beam reporting is triggered, and the UE may report the configured BSI via the PUCCH or PUSCH configured according to the RRC configuration. If the measurement results do not satisfy the configured event, the UI/ED beam reporting may not be performed.
  • the UE receives reference signals.
  • the reference signals can be transmitted according to RRC configuration information. Accordingly, the UE performs measurements on the received reference signals based on the RRC configuration information.
  • the UE receives a deactivation signal for NW-initiated semi-static beam reporting.
  • the deactivation signal may be indicated based on MAC-CE or DCI. Accordingly, the UE transitions to a state where it does not perform NW-initiated semi-static beam reporting, and NW-initiated semi-static beam reporting is discontinued.
  • a deactivation signaling for NW-initiated semi-static beam reporting and an activation signaling for UI/ED beam reporting are received.
  • the deactivation signaling for NW-initiated semi-static beam reporting and the activation signaling for UI/ED beam reporting may be indicated using one MAC-CE or one DCI.
  • the NW-initiated semi-static beam reporting is deactivated and the UI/ED beam reporting is activated. That is, the UE does not perform the NW-initiated semi-static beam reporting and transitions to a state in which the UI/ED beam reporting can be transmitted.
  • the base station transmits an RRC configuration message, and the UE receives the RRC configuration message.
  • the RRC configuration message may include configuration information for NW-initiated aperiodic beam reporting.
  • the UE receives an activation signal for UI/ED beam reporting.
  • the UE may be instructed to activate UI/ED beam reporting based on MAC-CE or DCI.
  • the activation signal transitions the UE to a state capable of performing UI/ED beam reporting.
  • step S2105 the UE receives reference signals.
  • the reference signals can be transmitted according to RRC configuration information. Accordingly, the UE performs measurements on the received reference signals based on the RRC configuration information.
  • step S2107 the UE determines UI/ED beam reporting triggering based on the configured event. If the measurement results for the reference signals satisfy the configured event, the UI/ED beam reporting is triggered, and the UE may report the configured BSI via the PUCCH or PUSCH configured according to the RRC configuration. If the measurement results do not satisfy the configured event, the UI/ED beam reporting may not be performed.
  • step S2111 the UE receives an activation signal for NW-initiated aperiodic beam reporting.
  • the activation signal may be indicated based on MAC-CE or DCI. Accordingly, the UE transitions to a state capable of performing NW-initiated aperiodic beam reporting.
  • the UE receives reference signals.
  • the reference signals can be transmitted according to RRC configuration information. Accordingly, the UE performs measurements on the received reference signals based on the RRC configuration information.
  • the UE transmits an NW-initiated aperiodic beam report.
  • the NW-initiated beam report may include information about the channel quality measured using the reference signal.
  • the NW-initiated beam report may be performed aperiodic.
  • activation and deactivation can be indicated via MAC-CE or DCI. If DCI is utilized, activation or deactivation can be indicated using the CSI request field in DCI 0_1, DCI 0_2. In addition, activation/deactivation for UI/ED beam reporting can be operated in different ways depending on the UL channel that reports beam information. For example, if the beam report is transmitted via PUCCH, activation or deactivation can be indicated via MAC-CE, and if the beam report is transmitted via PUSCH, activation or deactivation can be indicated via DCI.
  • the UE receives configuration information for UI/ED beam reporting via an RRC configuration message for NW-initiated beam reporting.
  • the UE can receive a common RRC configuration message for both UI/ED beam reporting and NW-initiated beam reporting.
  • the NW-initiated beam reporting and UI/ED beam reporting can be operated so that they do not operate simultaneously.
  • the beam reporting procedure may be performed according to an embodiment based on a combination of some or all of the embodiments described above.
  • beam reporting may be operated according to a combination of some or all of the embodiments described with reference to FIGS. 17 to 21.
  • NW-initiated beam reporting and UI/ED beam reporting configured with different report types (e.g., periodic, aperiodic, or semi-static) may be combined.
  • periodic UI/ED beam reporting and aperiodic NW-initiated beam reporting may be combined, and semi-static UI/ED beam reporting and aperiodic NW-initiated beam reporting may be combined.
  • the UI/ED beam report message is transmitted in response to the triggering of the UI/ED beam report upon fulfillment of a configured event.
  • the beam report message may be transmitted over an uplink physical channel configured by previously received RRC configuration information.
  • the UE may transmit pre-signaling (e.g., notification, resource request, etc.) or preliminary signaling for the UI/ED-based beam report and then transmit the UI/ED beam report message.
  • the pre-signaling or preliminary signaling may be transmitted over an uplink physical channel configured by previously received RRC configuration information. If a resource request is transmitted as the pre-/preliminary signaling, the base station may allocate an uplink resource for the UI/ED beam report message in response thereto, and the UE may transmit the UI/ED beam report message over the allocated uplink resource.
  • FIG. 22 illustrates an example of a procedure for a terminal to perform UI/ED beam reporting according to one embodiment of the present disclosure.
  • the terminal establishes a connection with the base station.
  • the terminal may perform an initial access procedure to establish a connection with the base station.
  • the terminal may receive a synchronization signal and system information from the base station, transmit a RACH preamble, receive a random access response (RAR) message, and perform procedures for establishing an RRC connection.
  • RAR random access response
  • the terminal receives at least one RRC configuration message from the base station.
  • the RRC configuration message may include information related to UI/ED beam reporting.
  • the RRC configuration message may include information about a reference signal, information about a physical channel configuration through which the beam report message is transmitted, or a quantity related to the beam report.
  • the reference signal, physical channel, and quantity related to the UI/ED beam report may be set independently from the reference signal, physical channel, and quantity related to the NW-initiated beam report.
  • the terminal receives a reference signal from the base station.
  • the terminal can receive at least one reference signal based on information included in a previously received RRC configuration message.
  • the terminal can determine information about the beam state based on the received reference signal.
  • the terminal can obtain information about the beam state by performing a measurement on the reference signal.
  • the information about the beam state can include at least one of SSBRI, CRI, (L1-)RSRP, SINR, CQI, RI, PMI, and LI.
  • step S2207 the terminal determines triggering for beam reporting based on the measurement result of the reference signal. Triggering for beam reporting can be detected when an event is met.
  • the event can be predefined or configured by the base station. If configured by the base station, information about a specific event can be transmitted via an RRC configuration message.
  • UI/ED beam reporting in addition to whether an event is met, whether UI/ED beam reporting is enabled can be further considered. In this case, the terminal can perform this step only while UI/ED beam reporting is enabled.
  • activation for UI/ED beam reporting can be confirmed through signaling indicating activation of UI/ED beam reporting (e.g., implicit indication or explicit indication) or can be confirmed based on the status of NW-initiated beam reporting linked to UI/ED beam reporting.
  • step S2209 the terminal transmits a beam report message to the base station.
  • the terminal may generate and transmit a beam report message.
  • the beam report message may be transmitted via a physical channel configured by an RRC configuration message.
  • FIG. 23 illustrates an example of a procedure for a base station to receive a UI/ED beam report according to one embodiment of the present disclosure.
  • the base station establishes a connection with the terminal.
  • the base station may perform an initial access procedure to establish a connection with the terminal.
  • the base station may transmit a synchronization signal and system information, receive an RACH preamble from the terminal, transmit an RAR message, and perform procedures for establishing an RRC connection.
  • the base station transmits an RRC configuration message to the terminal.
  • the RRC configuration message may include information related to UI/ED beam reporting.
  • the RRC configuration message may include information about the reference signal, information about the physical channel configuration through which the beam report message is transmitted, or a quantity related to the beam report.
  • the reference signal, physical channel, and quantity may be set independently from the reference signal, physical channel, and quantity used in the NW-initiated beam report.
  • the base station transmits a reference signal to the terminal.
  • the base station may transmit at least one reference signal based on information included in a previously transmitted RRC configuration message.
  • the reference signal may include SSB, CSI-RS, or other signals technically equivalent thereto.
  • the reference signal for UI/ED beam reporting may be configured independently of the reference signal used for NW-initiated beam reporting.
  • the base station receives a beam report message from the terminal.
  • the beam report message can be received via a physical channel configured by an RRC configuration message.
  • the beam report message can be transmitted in response to a beam report being triggered by the terminal based on the measurement result of the reference signal.
  • the event can be predefined or configured by the base station. If configured by the base station, the base station can convey information about a specific event to the terminal via the RRC configuration message.
  • beam reporting can be understood as UI/ED beam reporting.
  • UI/ED beam reporting can be performed independently from NW-initiated beam reporting. Therefore, activation or deactivation of UI/ED beam reporting can be separately indicated. Activation or deactivation can be explicitly or implicitly indicated via an RRC configuration message, MAC CE, or DCI.
  • a base station or a communication operator can set additional rules to prevent NW-initiated beam reporting and UI/ED beam reporting from overlapping. For example, NW-initiated beam reporting can be operated so that it is not performed during a time period in which UI/ED beam reporting is activated.
  • the UI/ED beam report transmission procedure can support the following Modes A and B.
  • Mode A can be understood as a mode in which the gNB dynamically schedules UCI.
  • the UE requests resources for performing beam reporting on the second uplink channel via the first PUCCH.
  • the request format (e.g., SR or a new UCI type) may be further reviewed during this process.
  • the UE detects the DCI format to indicate the resources of the second UL channel on which the beam report will be transmitted.
  • the beam report is transmitted via the second UL channel.
  • This option is a basic function of the UE, and all UEs that support UI/ED beam reporting must provide this function.
  • a new DCI format may not be introduced.
  • Mode B can be understood as a mode in which UCI is used on the resources of the pre-configured second uplink channel.
  • the UE transmits the first PUCCH to indicate that it will perform beam reporting on the second uplink channel.
  • the notification format e.g., SR or a new UCI type
  • the UE then transmits the beam report via the second uplink channel.
  • the specific type of the second uplink channel e.g., whether PUCCH, PUSCH, or both channels are used
  • the notification in Step 1 may be performed as a separate reporting instance from the beam reporting. Whether the UE receives response information may also be further reviewed.
  • Cross-CC beam reporting may be supported for both options.
  • the first PUCCH channel supports a 1-bit indication and requests resources for the second UL channel to transmit beam reports.
  • periodic PUCCH resources are configured via dedicated RRC signals, and PUCCH formats 0 or 1 are used.
  • the first PUCCH channel supports a 1-bit indication and indicates that beam reports will be transmitted on the second UL channel.
  • periodic PUCCH resources are configured via dedicated RRC signals, and PUCCH formats 0 or 1 are used. Whether and how to support multi-bit indications on the first PUCCH in Modes A and B when multiple events are approved may be further reviewed. The details of the dedicated RRC signals may also be further reviewed. The above applies at least to the single CC case.
  • the UL-Grant DCI format includes at least DCI formats 0_1 and 0_2, and the second channel may include a PUSCH.
  • the terminal beam reporting trigger scheme through DCI format 0_3 and the UL-Grant DCI format may be further reviewed.
  • the second channel can be set to PUCCH.
  • a 1-bit field is included in the DL-Grant DCI format and can indicate transmission of a UEI (UE initiated) beam report.
  • the PUCCH resource for HARQ-ACK transmission can be reused for transmitting both HARQ-ACK and UEI reports.
  • the DL-Grant DCI format includes at least DCI formats 1_1 and 1_2, and whether DCI format 1_3 is included can be additionally reviewed.
  • one of the following two alternatives can be selected with respect to the dedicated RRC signal for the first PUCCH channel configuration of Mode A.
  • RRC parameter e.g., reportResourceRequest-UEIBR
  • reportResourceRequest-UEIBR reportResourceRequest-UEIBR
  • An RRC parameter (e.g., firstPUCCHResourceConfig-ModeA-UEIBR) is introduced for periodic PUCCH resource configuration. This RRC parameter is not associated with SchedulingRequestId. Further consideration may be given to encoding 1 bit into PUCCH resources (e.g., reusing the encoding mechanism for positive/negative SR).
  • the dedicated RRC parameter may include periodicityAndOffset or PUCCH-ResourceID. The above applies at least to single-CC cases.
  • one of the following two alternatives can be selected with respect to the dedicated RRC signal for the first PUCCH channel configuration of Mode B.
  • RRC parameter e.g., reportNotification-UEIBR
  • This RRC parameter is associated with a dedicated SchedulingRequestId.
  • the specific signaling method is determined by RAN2.
  • An RRC parameter (e.g., firstPUCCHResourceConfig-ModeB-UEIBR) is introduced for periodic PUCCH resource configuration. This RRC parameter is not associated with SchedulingRequestId. Further consideration may be given to encoding 1 bit into PUCCH resources (e.g., reusing the encoding mechanism for positive/negative SR). Dedicated RRC parameters may include periodicityAndOffset or PUCCH-ResourceID. The above applies at least to single-CC cases.
  • the triggering procedure related to Mode A may be selected from one of the following two options.
  • Option 1 A new 1-bit field is introduced in DCI formats 0_1/0_2 to trigger UEI beam reporting transmission. Further consideration may be given to DCI format 0_3.
  • Option 2 Reuse the existing CSI request field of DCI format 0_1/0_2 to trigger terminal beam report transmission. Further consideration may be given to DCI format 0_3.
  • Handling of multiple CSI reporting configurations associated with the same first PUCCH resource or the same scheduled PUSCH related to UI/ED beam reporting may be further reviewed.
  • the UEI beam report associated with Mode B is transmitted at the first available transmission opportunity on the second uplink channel X symbols after the last symbol in which a report notification was transmitted on the first PUCCH channel.
  • the following options may be provided for resource mapping/configuration between the first channel and the second channel for a specific CSI report configuration in Mode B.
  • Only one first PUCCH resource and one pre-configured second uplink channel resource can be associated with a CSI reporting configuration for UI/ED beam reporting.
  • Option 1B No restrictions on periodicity.
  • the CSI request field in DCI format 0_1/0_2 is reused to trigger UEI beam report transmission. If the CSI request field indicates a CSI trigger state associated with a UEI beam report configuration, the UE transmits the relevant UEI beam report on the second PUSCH scheduled by the corresponding DCI format 0_1/0_2. Further considerations regarding DCI format 0_3 may be made here.
  • At least Option 1 may be supported for resource mapping/configuration between the first uplink channel and the second uplink channel of Mode B.
  • Only a single periodic PUCCH resource for the first channel and a single pre-configured resource for the second uplink channel can be associated with the CSI reporting configuration for UI/ED beam reporting.
  • Option 1A The first PUCCH resource and the second uplink channel resource have the same periodicity.
  • Option 1B There is no periodicity limit between the two resources.
  • the Type-1 CG PUSCH pre-configured as the second uplink channel of Mode B transmits the beam report at least the following Option 3 may be supported.
  • the same Type-1 CG PUSCH can carry UL-SCH, other UCI, and beam reporting together.
  • Type-1 CG PUSCH is a dedicated Type-1 CG PUSCH for carrying beam reports.
  • the PUSCH cannot carry UL-SCH or other UCI.
  • Type-1 CG PUSCH is a Type-1 CG PUSCH intended to carry beam reports.
  • the PUSCH cannot carry UL-SCH, but can carry other UCIs.
  • the computer-readable recording medium may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, etc.
  • the program instructions may include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter, etc.
  • a programmable logic device e.g., a field-programmable gate array
  • a field-programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described in the present disclosure. In general, the methods are preferably performed by some hardware device.

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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 concerne la réalisation d'un rapport de faisceau initié par un UE / commandé par un événement (UI/ED) dans un système de communication sans fil, le procédé comprenant les étapes consistant à : établir une connexion avec une station de base ; recevoir, en provenance de la station de base, un message de configuration de gestion de ressources radio (RRC) comprenant des informations de configuration concernant un rapport de faisceau initié par un équipement utilisateur / commandé par un événement (UI/ED) ; recevoir au moins un signal de référence en provenance de la station de base ; déterminer un déclenchement pour le rapport de faisceau sur la base des informations de configuration et d'un résultat de mesure de l'au moins un signal de référence ; et transmettre un message de rapport de faisceau à la station de base en réponse au déclenchement.
PCT/KR2025/099437 2024-02-19 2025-02-18 Procédé et dispositif de rapport de faisceau dans un système de communication sans fil Pending WO2025178452A1 (fr)

Applications Claiming Priority (4)

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KR10-2024-0023624 2024-02-19
KR20240023624 2024-02-19
KR1020250020633A KR20250127723A (ko) 2024-02-19 2025-02-18 무선 통신 시스템에서 빔 보고를 수행하기 위한 방법 및 장치
KR10-2025-0020633 2025-02-18

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210022026A1 (en) * 2019-07-17 2021-01-21 Samsung Electronics Co., Ltd. Method and apparatus for triggering multi-beam reporting
WO2023272710A1 (fr) * 2021-07-02 2023-01-05 Qualcomm Incorporated Techniques de transmission d'un rapport de faisceau de cellules hors desserte déclenché par un événement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210022026A1 (en) * 2019-07-17 2021-01-21 Samsung Electronics Co., Ltd. Method and apparatus for triggering multi-beam reporting
WO2023272710A1 (fr) * 2021-07-02 2023-01-05 Qualcomm Incorporated Techniques de transmission d'un rapport de faisceau de cellules hors desserte déclenché par un événement

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
CATT: "Discussion on R19 mobility enhancements", 3GPP DRAFT; RP-232995, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. TSG RAN, no. Edinburgh, GB; 20231211 - 20231215, 4 December 2023 (2023-12-04), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052557573 *
FUJITSU: "Views on Scope for MIMO Evolution in Rel-19", 3GPP DRAFT; RP-233479, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. TSG RAN, no. Edinburgh, Scotland; 20231211 - 20231215, 10 December 2023 (2023-12-10), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052573899 *
ZTE: "Views on MIMO evolution in Rel-19", 3GPP DRAFT; RP-233609, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. TSG RAN, no. Edinburgh, Scotland; 20231211 - 20231215, 4 December 2023 (2023-12-04), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052558341 *

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