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US20190349915A1 - Method for transmitting/receiving signals by using beams in wireless communication system, and device for same - Google Patents

Method for transmitting/receiving signals by using beams in wireless communication system, and device for same Download PDF

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Publication number
US20190349915A1
US20190349915A1 US16/475,899 US201816475899A US2019349915A1 US 20190349915 A1 US20190349915 A1 US 20190349915A1 US 201816475899 A US201816475899 A US 201816475899A US 2019349915 A1 US2019349915 A1 US 2019349915A1
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United States
Prior art keywords
pdcch
specific
resource
reception
base station
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Abandoned
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US16/475,899
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English (en)
Inventor
Minki AHN
Jiwon Kang
Kijun KIM
Jonghyun Park
Kilbom LEE
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LG Electronics Inc
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LG Electronics Inc
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Priority to US16/475,899 priority Critical patent/US20190349915A1/en
Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AHN, Minki, KIM, KIJUN, PARK, JONGHYUN, KANG, JIWON, LEE, Kilbom
Publication of US20190349915A1 publication Critical patent/US20190349915A1/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • 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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • 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
    • H04W72/0413—
    • 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
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems

Definitions

  • Requirements of a next-generation mobile communication system should be able to support acceptance of explosive data traffic, a dramatic increase in per-user data rate, acceptance of a significant increase in the number of connected devices, very low end-to-end latency, and high-energy efficiency.
  • various technologies are researched, which include dual connectivity, massive multiple input multiple output (MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), super wideband support, device networking, and the like.
  • This specification is to provide a method of transmitting and receiving information on the reception of a beam for receiving a specific signal or a PDCCH.
  • this specification is to define an operation method of a user equipment depending on whether beam reception information for receiving a PDCCH has been received.
  • this specification is to define the Rx beam of a user equipment configured for each PDCCH when a plurality of PDCCHs is transmitted and an operation of the user equipment according to the Rx beam.
  • this specification is to provide a method of transmitting and receiving information related to an Rx beam for receiving a PDSCH.
  • This specification provides a method of transmitting and receiving signals through at least one reception beam in a wireless communication system signal.
  • the method performed by a user equipment includes receiving, from a base station, a beam reference signal used for beam management through a first reception beam; reporting, to the base station, a measurement result based on the beam reference signal when beam reporting is triggered; receiving, from the base station, control information related to a determination of a second reception beam for receiving a specific signal; and receiving the specific signal through the second reception beam based on the received control information, wherein when a plurality of specific signals is received through different symbols included in a specific time domain, the control information is configured for each specific resource.
  • the specific signal is a physical downlink control channel (PDCCH).
  • PDCH physical downlink control channel
  • control information indicates a resource quasi co-located (QCL) with a resource of a demodulation reference signal (DMRS) for the PDCCH reception.
  • QCL resource quasi co-located
  • DMRS demodulation reference signal
  • the resource quasi co-located (QCL) with the resource of the demodulation reference signal (DMRS) for the PDCCH reception is a resource of the beam reference signal.
  • receiving, from the base station, the control information includes receiving, from the base station, information for a given number of beam sets for receiving the PDCCH through first signaling; and receiving, from the base station, information indicating a specific beam set configured for each specific time unit through second signaling.
  • priority is set for each of the given number of beam sets.
  • the specific time domain includes at least one time gap determined by taking into consideration at least one of the decoding time of the control information or beam switching latency between reception beams for the reception of a plurality of the PDCCHs.
  • this specification further includes transmitting, to the base station, UE capability information indicating a capability of the UE related to the beam switching latency.
  • this specification further includes receiving, from the base station, information related to the at least one time gap.
  • the information related to the at least one time gap includes at least one of the number of time gaps included in the specific time domain or duration of the time gap.
  • control information is represented as a bitmap.
  • this specification further includes receiving, from the base station, indication information indicating a third reception beam for receiving a physical downlink shared channel (PDSCH); and receiving, from the base station, a physical downlink shared channel (PDSCH) based on the received indication information.
  • indication information indicating a third reception beam for receiving a physical downlink shared channel (PDSCH)
  • PDSCH physical downlink shared channel
  • the indication information indicates a preconfigured reception beam or indicates a reception beam identical with a second reception beam.
  • the PDSCH is received after a specific offset from timing in which the indication information is received.
  • the specific offset is determined by taking into consideration at least one of a decoding time for the indication information or beam switching latency.
  • this specification provides a user equipment transmitting and receiving signals through at least one Rx beam in a wireless communication system, including a radio frequency (RF) module configured to transmit and receive radio signals and a processor functionally connected to the RF module.
  • the processor is configured to receive, from a base station, a beam reference signal used for beam management through a first reception beam; report, to the base station, a measurement result based on the beam reference signal when beam reporting is triggered; receive, from the base station, control information related to a determination of a second reception beam for receiving a specific signal; and receive the specific signal through the second reception beam based on the received control information, wherein when a plurality of specific signals is received through different symbols included in a specific time domain, the control information is configured for each specific resource.
  • RF radio frequency
  • the specific resource is a physical downlink control channel (PDCCH).
  • PDCH physical downlink control channel
  • This specification has an effect in that it can reduce the decoding number of a user equipment by defining contents related to an Rx beam for receiving a specific signal or a PDCCH.
  • FIG. 4 shows examples of a resource grid for each antenna port and numerology to which a method proposed in this specification may be applied.
  • FIG. 7 shows an example of a Tx-Rx beam configuration between an eNB and a user equipment to which a method proposed in this specification may be applied.
  • FIG. 14 illustrates a block diagram of a communication device according to an embodiment of the present invention.
  • 3GPP LTE/LTE-A is chiefly described, but the technical characteristics of the present disclosure are not limited thereto.
  • New RAN A wireless access network which supports NR or E-UTRA or interacts with NGC.
  • an NG-RAN is composed of an NG-RA user plane (a new AS sublayer/PDCP/RLC/MAC/PHY) and gNBs providing control plane (RRC) protocol endpoints for User Equipment (UE).
  • NG-RA user plane a new AS sublayer/PDCP/RLC/MAC/PHY
  • RRC control plane
  • FIG. 2 shows the relation between an uplink frame and a downlink frame in a wireless communication system to which a method proposed in this specification may be applied.
  • All UEs cannot perform transmission and reception at the same time, and this means that all the OFDM symbols of a downlink slot or an uplink slot cannot be used.
  • Table 2 shows the number of OFDM symbols per slot for a normal CP in a numerology ⁇
  • Table 3 shows the number of OFDM symbols per slot for an extended CP in the numerology ⁇ .
  • an antenna port In relation to a physical resource of an NR system, an antenna port, a resource grid, a resource element, a resource block, a carrier part, etc. may be taken into consideration.
  • the antenna port is defined so that a channel on which a symbol on the antenna port is carried is deduced from a channel on which a different symbol on the same antenna port is carried.
  • the two antenna ports may be said to have a quasi co-located or quasi co-location (QC/QCL) relation.
  • the large-scale property includes one or more delay spread, Doppler spread, a frequency shift, average received power, or received timing.
  • a transmitted signal is described by one or more resource grids configured with N RB ⁇ N sc RB subcarriers and OFDM symbols of 2 ⁇ N symb ( ⁇ ) .
  • N RB ⁇ ⁇ N RB max, ⁇ indicates a maximum transmission bandwidth, which may be different between the uplink and the downlink in addition to between numerologies.
  • FIG. 4 shows examples of a resource grid for each antenna port and numerology to which a method proposed in this specification may be applied.
  • the resource element (k, l ) for the numerology ⁇ and the antenna port p corresponds to a complex value a k, l p, ⁇ ) . If there is no danger of confusion or if a specific antenna port or numerology is not specified, indices p and ⁇ may be dropped. As a result, a complex value may be or a k, l (p) or a k, l .
  • physical resource blocks are numbered from 0 to N RB ⁇ ⁇ 1.
  • the relation between a physical resource block number n PRB and resource elements (k,l) on the frequency domain is given as in Equation 1.
  • a UE may be configured receive or transmit only a subset of a resource grid.
  • a set of resource blocks configured to be received or transmitted by the UE is numbered from 0 to N URB ⁇ ⁇ 1 on the frequency domain.
  • Physical uplink control signaling needs to carry at least hybrid-ARQ acknowledgement, CSI report (including beamforming information, if possible), and a scheduling request.
  • At least two transmission methods for an uplink control channel supported in an NR system are supported.
  • An uplink control channel may be transmitted in long duration over a plurality of uplink symbols in order to improve coverage.
  • the uplink control channel is frequency-division multiplexed with an uplink data channel within a slot.
  • TDM and FDM between a PUCCH of short duration and a PUCCH of long duration are supported for different UEs in one slot, at least.
  • a PRB (or a plurality of PRBs) is a minimum resource unit size for an uplink control channel. If hopping is used, a frequency resource and hopping may not be spread to a carrier bandwidth.
  • a UE-specific RS is used for NR-PUCCH transmission.
  • a set of PUCCH resources is configured by higher layer signaling. The PUCCH resources within the configured set are indicated by downlink control information (DCI).
  • DCI downlink control information
  • timing between data reception and hybrid-ARQ acknowledgement transmission needs to be indicated dynamically (along with at least RRC).
  • a combination of a semi-static configuration and dynamic signaling (for at least some types of UCI information) is used to determine a PUCCH resource for a “long and short PUCCH format.”
  • the PUCCH resource includes a time domain, a frequency domain, and a code domain, if applicable.
  • UCI on the PUSCH that is, to use some of resources for UCI, is supported for the simultaneous transmission of the UCI and data.
  • a time interval between scheduling request (SR) resources configured for a UE may be smaller than one slot.
  • a Tx/Rx beam correspondence in a TRP and a UE is defined as follows.
  • the following DL L1/L2 beam management procedure is supported within one TRP or a plurality of TRPs.
  • P-1 this is used to enable UE measurement for different TRP Tx beams in order to support the selection of a TRP Tx beam/UE Rx beam(s).
  • P-2 UE measurement for different TRP Tx beams is used to change an inter/intra-TRP Tx beam(s).
  • Aperiodic reporting (aperiodic reporting) triggered by at least a network is supported in P-1-, P-2- and P-3-related operations.
  • UE measurement based on an RS for beam management is configured with K (a total number of beams) beams.
  • a UE reports a measurement result of selected N Tx beams.
  • N is not an essentially fixed number.
  • a procedure based on an RS for a mobility object is not excluded.
  • Reporting information includes at least a measurement quantity for an N beam(s) and information indicating an N DL Tx beam when N ⁇ K.
  • a UE may report a CSI-RS resource indicator (CRI) of N′ with respect to K′>1 non-zero power (NZP) CSI-RS resources.
  • CRI CSI-RS resource indicator
  • a UE may be configured with the following higher layer parameters for beam management.
  • NR supports the following beam reporting by taking into consideration an L group where L>1.
  • NR supports beam management regardless of beam-related indication. If beam-related indication is provided, information on a UE-side beamforming/reception procedure used for CSI-RS-based measurement may be indicated for a UE through QCL. Parameters for delay, Doppler, and an average gain used in the LTE system and a spatial parameter for beamforming in a receiver will be added as a QCL parameter to be supported in NR.
  • the QCL parameter may include a parameter related to an angle of arrival in a UE Rx beamforming viewpoint and/or parameters related to an angle of departure in an eNB Rx beamforming viewpoint.
  • NR supports that the same or different beams are used for control channel and corresponding data channel transmission.
  • Information indicating an RS antenna port is indicated through DCI (downlink permission). Furthermore, the information indicates an RS antenna port QCLed with a DMRS antenna port.
  • a different set of DMRS antenna ports for a DL data channel may be indicated as QCL with a different set of RS antenna ports.
  • MTC massive machine type communications
  • next-generation radio access technology in which enhanced mobile broadband (eMBB) communication, massive MTC (mMTC), and ultra-reliable and low latency communication (URLLC) are taken into consideration is being discussed.
  • eMBB enhanced mobile broadband
  • mMTC massive MTC
  • URLLC ultra-reliable and low latency communication
  • NR new RAT
  • a new RAT system uses an OFDM transmission method or a transmission method similar to the method, and has an OFDM numerology of Table 4 representatively.
  • Table 4 shows an example of OFDM parameters of a New RAT system.
  • Subcarrier-spacing 60 kHz OFDM symbol length 16.33 us Cyclic Prefix (CP) length 1.30 us/1.17 us System BW 80 MHz No. of available subcarriers 1200 Subframe length 0.25 ms Number of OFDM symbol per Subframe 14 symbols
  • mmW millimeter wave
  • multiple antenna elements may be installed in the same area because a wavelength is short.
  • a wavelength is 1 cm
  • a total of 64 (8 ⁇ 8) antenna elements may be installed in a panel of 4 ⁇ 4 cm at intervals of 0.5 lambda (wavelength) in a 2-dimensional array form.
  • mmW coverage is increased or throughput is improved by raising a beamforming (BF) gain using multiple antenna elements.
  • BF beamforming
  • hybrid BF (HBF) having the number of BTXRUs smaller than Q antenna elements in the middle form of digital BF and analog BF may be taken into consideration.
  • HBF is different depending on a method of connecting B TXRUs and Q antenna elements, but the direction of beams that may be transmitted at the same time is limited to B or less.
  • a TXRU virtualization model shows the relation between the output signal of a TXRU and the output signals of antenna elements.
  • FIG. 5 a shows an example of a method of connecting a TXRU to a sub-array.
  • FIG. 5 a an antenna element is connected to only one TXRU.
  • FIG. 5 b shows a method of connecting TXRUs to all antenna elements.
  • the antenna elements are connected to all TXRUs.
  • W indicates a phase vector multiplied by an analog phase shifter.
  • mapping between CSI-RS antenna ports and TXRUs may be 1-to-1 or 1-to-many.
  • PDSCH transmission is possible in one analog beam direction at one timing by analog beamforming.
  • an antenna port and a TXRU may be construed as having the same meaning.
  • the PDSCH 1 transmitted to the UE 1 and the PDSCH 2 transmitted to the UE 2 may be frequency-division multiplexed (FDM) and transmitted.
  • FDM frequency-division multiplexed
  • the channel state information generally refers to information which may indicate the quality of a radio channel (or also called a “link”) formed between the UE and an antenna port.
  • a rank indicator (RI), a precoding matrix indicator (PMI), or a channel quality indicator (CQI) corresponds to the information.
  • RI rank indicator
  • PMI precoding matrix indicator
  • CQI channel quality indicator
  • reporting on a beam combination may be performed by the indication of a network periodically and/or aperiodically.
  • event-triggered reporting may be performed.
  • the given level may be pre-defined or may be signaled by a network (through high layer signaling).
  • a BL/CE UE configured as CEModeA or CEModeB does not expect that it will be configured as a non-zero transmission power CSI-RS.
  • a UE does not assume that two antenna ports are QCL, unless described otherwise.
  • the UE in order to receive help for the channel estimation of a DMRS transmitted along with a scheduled PDSCH, the UE is limited to use LSPs estimated from a specific QCLed CSI-RS resource indicated in corresponding scheduling DCI.
  • At least one of the followings may be defined/configured as QCL parameters taken into consideration in the NR environment:
  • This may mean that, for example, an Rx beam direction (and/or Rx beam width/sweeping degree) when a transmission signal from other antenna port(s) is received based on an AA estimated from a specific antenna port(s) is configured to be the same or similar (in association with this) and reception processing is possible (meaning that reception performance when an operation is performed as described above is guaranteed to be a specific level or more) between antenna ports whose QCL is guaranteed in the AA viewpoint.
  • the AA may also be represented as a name, such as an “(almost) dominant arrival angle”, for example.
  • a specific dominant (arrival) angle S of a signal measured from a specific antenna port is present, a specific dominant (arrival) angle of a signal measured from another antenna port capable of QCL assumption with the specific dominant (arrival) angle S may have a meaning that it is “almost” similar to the S.
  • the AS may be interpreted as a parameter regarding that how much is the beam direction spread and received by a radiator distribution (based on/with reference to the AA).
  • FIG. 7 shows an example of a Tx-Rx beam configuration between an eNB and a UE to which a method proposed in this specification may be applied.
  • reception performance may be increased when the UE receives a signal based on the Tx beam #2 of the eNB using the Rx beam #2.
  • reception performance is reduced or not detected in an Rx beam except the Rx beam #2.
  • the UE may not detect the PDCCH due to a sudden change in the channel environment, such as UE mobility, rotation, or blockage.
  • the eNB may be aware of such a situation using an implicit or explicit method as in the following four examples.
  • the following four examples show examples in which the eNB can be aware of the PDCCH detection failure of the UE using an implicit or explicit method.
  • the first is the case where the eNB has transmitted a DL grant to the UE, but has not received acknowledgement (Ack) or non-acknowledgement (Nack) from the corresponding UE.
  • Ack acknowledgement
  • Nack non-acknowledgement
  • the fourth is the case where the eNB can be aware of the current DL Tx-Rx beam quality through the aperiodic or periodic beam reporting (of the UE).
  • this specification proposes a method of transmitting and receiving robust PDCCHs in order to solve the PDCCH detection failure of a UE attributable to a sudden change in the channel environment.
  • NW network
  • the NW may previously signal to each UE for a subframe set in which each UE has to perform blind decoding on a control channel (through a master information block (MIB), a system information block (SIB) or RRC signaling) based on the beam report of the UE.
  • MIB master information block
  • SIB system information block
  • RRC Radio Resource Control
  • the NW may configure QCL for a new spatial parameter (e.g., dominant arrival angle) and notify the UE of the QCL as described above.
  • a new spatial parameter e.g., dominant arrival angle
  • the new spatial parameter may mean information indicating that the resource of a DMRS for the PDCCH decoding has been QCLed with the resource of a BRS.
  • the UE may decode the PDCCH in a corresponding BRS Rx beam direction based on information (i.e., a new spatial parameter) indicating that a specific BRS (or MRS or CSI-RS) and a DMRS for PDCCH demodulation have been QCLed in a dominant arrival angle (DAA) viewpoint.
  • information i.e., a new spatial parameter
  • a specific BRS or MRS or CSI-RS
  • DAA dominant arrival angle
  • a PDCCH may be transmitted only in the first symbol of a subframe (set), and a PDSCH may be transmitted from the second symbol.
  • the UE may perform a blind decoding operation on the PDCCH by applying a different Rx beam or the same Rx beam for each control symbol.
  • QCL for the new spatial parameter may be simply called beam indication (for a PDCCH and/or a PDSCH).
  • a UE may select a suitable Tx-Rx beam combination through the measurement of a BRS.
  • the UE may perform blind detection on the PDCCH by applying a different Rx beam through a different QCL configuration for each control symbol.
  • FIG. 8 shows an example in which QCL for a new spatial parameter has been configured for each control symbol, which is proposed in this specification.
  • the first control symbol may be defined as a control symbol for a primary PDCCH
  • the second control symbol may be defined as a control symbol for a secondary PDCCH
  • the primary and the secondary may mean the priority of a search space for the blind decoding of the UE.
  • the UE performs independent DMRS demodulation on each search space for the decoding of each PDCCH.
  • a DMRS for the primary PDCCH may be used for a DMRS for PDSCH reception.
  • all configured DCI information of a corresponding UE may be received in the primary PDCCH.
  • the UE may omit the blind decoding of a secondary PDCCH. That is, through the process, the complexity of blind decoding by a UE for a PDCCH can be reduced.
  • the second embodiment relates to a method of blind-detecting, by a UE, a PDCCH using a single Rx beam if beam indication is present (or if QCL for a new spatial parameter is present).
  • an operation for the UE to blind-detect the PDCCH using a single Rx beam may be represented as a “second operation mode” or a “single Rx beam PDCCH blind detection mode.”
  • a UE may share DMRS demodulation information of each control symbol in order to decide the search space of each control symbol due to the same QCL configuration.
  • the indicated Rx beam and the search space mapping may be previously configured in the corresponding UE through higher layer signaling (e.g., RRC signaling).
  • higher layer signaling e.g., RRC signaling
  • an NW may transmit, to the UE, information (QCL indication or new spatial parameter or beam indication) indicating that a specific BRS (e.g., a mobility RS (MRS), a synchronize signal (SS) block, a CSI-RS) and a DMRS for PDCCH demodulation have been QCLed spatially partially (e.g., a dominant arrival angle (DAA), the mean of arrival angle).
  • a specific BRS e.g., a mobility RS (MRS), a synchronize signal (SS) block, a CSI-RS
  • DAA dominant arrival angle
  • the UE may decode the PDCCH in a BRS Rx beam direction based on the corresponding information.
  • the NW may transmit, to the UE, QCL indication (or beam indication for PDCCH reception) dynamically in a previous X-th subframe (in which the PDCCH is monitored based on corresponding QCL indication) through L1 signaling or L2 signaling or may transmit the QCL indication through L3 signaling semi-statically.
  • QCL indication or beam indication for PDCCH reception
  • the QCL indication is transmitted through only L1 signaling (e.g., DCI), there is an advantage in that an eNB can schedule DCI dynamically, but there is a disadvantage in that the payload size of DCI greatly increases.
  • L1 signaling e.g., DCI
  • an NW may combine the following three cases and hierarchically signal to a UE for QCL indication.
  • an NW may configure N beam sets (or beam groups) for the PDCCH reception of a UE, and may notify the UE that a PDCCH Rx beam has to be configured using which beam set for each slot (or subframe) through L2 signaling or L3 signaling.
  • the NW may designate the period of a slot that needs to be received for each beam set and a multiple of a slot number in such a manner that priority is assigned to N beam sets, the first beam set is configured every slot number of a multiple of 4, and the second beam set is configured every slot number of a multiple of 7.
  • Such a method can be naturally expanded to a specific pattern method in each beam set. If beam sets that need to be received in the same slot overlap (or are to overlap), a UE may configure a beam set based on priority or a pre-designated sequence.
  • Such a beam set may be beam information corresponding to a specific BRS or BRS set.
  • an eNB may dynamically indicate that a corresponding PDCCH should be received in which beam set through L1 signaling or L2 signaling with respect to a UE.
  • a detailed method of configuring N beam sets (or beam groups) for PDCCH reception may be described as in the following options.
  • Option 1 is a method of configuring N beam sets (or beam groups) for PDCCH reception based on the beam report of a UE (without separate eNB signaling).
  • an NW may map M beams to N beam sets using M-beam direction information and RSRP.
  • beam information having the greatest RSRP may be mapped to the first beam set, and the remaining (M ⁇ 1) beams may be mapped to the second beam set.
  • An eNB may update or substitute a beam within a beam set through L2 signaling (MAC-CE) or L3 signaling (RRC message) with respect to each beam set.
  • MAC-CE L2 signaling
  • RRC message L3 signaling
  • an eNB may dynamically determine a specific beam within the beam set using 2 bits.
  • the 2 bits may be defined as “00” (first beam), “01” (second beam), “10” (third beam), and “11” (fourth beam).
  • a bitmap is [1 0 0 1]
  • this may mean that a PDCCH is received in a corresponding slot through the first Rx beam, the fourth Rx beam.
  • Option 1 to 4 Some of or all the above-described options (Option 1 to 4) may be applied at the same time, and beam indication (or QCL indication) for PDCCH reception may be configured as various combinations.
  • beam information within a beam set indicates a BRS (e.g., a mobility RS (MRS), a synchronize signal (SS) block or a CSI-RS).
  • BRS e.g., a mobility RS (MRS), a synchronize signal (SS) block or a CSI-RS).
  • Beam information such as a beam #3 or #6, is indicated for convenience of understanding, and may indicate the resource index, resource index/antenna port index or ID of each RS.
  • an eNB may update or designate beam information of N beam sets (or beam pair link) for the PDCCH reception of a UE based on the beam reporting of the UE.
  • an NW may notify the UE of the update or modification of the beam information based on the beam reporting of the UE through separate signaling in order to confirm the update or modification.
  • a message for the confirmation may be transmitted to the UE through DCI or a MAC-CE.
  • the eNB may add 1 bit for the confirmation to the DCI indicating each beam set (or beam pair link), and may notify the UE of confirmation information regarding whether each beam set has been updated.
  • the eNB may provide notification that all the beam sets have been updated based on the M beam reporting through the DCI or MAC-CE of a corresponding confirmation message or may provide notification that a corresponding beam set is individually updated with reported beam information by adding 1 bit to DCI information for designating a specific beam set at the same time.
  • the UE that has received the confirmation message from the eNB may update PDCCH Rx beam information for each beam set based on the beam-reported beam information, and may receive a PDCCH.
  • various signaling methods such as DCI signaling, MAC-CE signaling, RRC signaling, specification-transparent and/or combinations of these signaling methods, may be taken into consideration.
  • the beam indication may have the same meaning as the above-described new spatial parameter or QCL indication.
  • some rules and/or configurations regarding a time/frequency domain pattern may be used for NR-PDCCH reception.
  • 2-level indication based on L1 signaling or L2 signaling along with an RRC configuration may be taken into consideration because DCI-only indication may not be proper due to the restriction of a DCI payload size.
  • the NR-PDCCH time/frequency/space region monitoring resource of each beam pair link may be configured by RRC, and an accurate PDCCH beam may be indicated by dynamic signaling, such as a MAC-CE or DCI signaling.
  • this may be dynamically indicated only when a BPL is changed.
  • beam information of each BPL may be implicitly updated based on beam reporting information.
  • a beam direction related to N BPLs may be mapped as N-beam reporting information in a given rule, such as an RSRP/CQI-base sequence.
  • an NW may transmit, to a UE, a confirmation regarding that a reported beam is applied to each BPL.
  • Dynamic beam indication for an NR-PDCCH is taken into consideration, and dynamic signaling indicates one or more of the following information.
  • a DCI format in which blind decoding is performed may be differently configured for each Rx beam (Tx-Rx beam pair, Tx-Rx associated beam) in which a PDCCH is received.
  • a PDCCH may be chiefly received in the Rx beam #1, and a PDCCH may be received in the Rx beam #2 and the Rx beam #3 in a longer period than the Rx beam #1 for the robustness of a UE.
  • the third embodiment may be identically applied to an uplink physical uplink control channel (PUCCH).
  • PUCCH uplink physical uplink control channel
  • an UCI format may be differently configured for each Tx beam (or beam pair link, Tx-Rx associated beam) of a UE that transmits a PUCCH.
  • the fourth embodiment relates to a method of allocating a time gap to a multi-symbol PDCCH by taking beam switching latency into consideration and reporting the capability of a UE for the allocation, if the UE receives a multi-symbol PDCCH through a different Rx beam (Tx-Rx associated beam) within one slot (or subframe).
  • FIG. 9 is a diagram showing an example in which a time gap has been allocated within a multi-symbol PDCCH, which is proposed in this specification.
  • a UE may receive a PDCCH through a different Rx beam (or Tx-Rx associated beam, beam pair).
  • an eNB previously requests capability information for the beam switching latency of a corresponding UE from the corresponding UE through a higher layer message (or signaling).
  • the capability information for the beam switching latency may be previously transmitted from the UE to the eNB through an RRC message.
  • an eNB may allocate a time gap between PDCCH symbols so that the corresponding UE receives a PDCCH through a different Rx beam, as in FIG. 9 b.
  • the time gap may be one piece of OFDM symbol duration or may be time duration previously designated by taking beam switching latency into consideration.
  • an eNB may transmit information on a time gap for the corresponding UE through L1 signaling or L2 signaling dynamically or through L3 signaling semi-statically.
  • the fourth embodiment may be identically applied to an UL PUCCH.
  • a time gap may be defined between PUCCH symbols by taking into consideration the beam switching latency of a UE (or eNB), and a PUCCH may be transmitted.
  • NR-PDCCH transmission supports robustness for beam pair link blocking.
  • the indication of a spatial QCL assumption between a DL RS antenna port and the DMRS antenna port of a DL data channel is supported: information indicating an RS antenna port is indicated through a DCI (downlink grants).
  • This information indicates the RS antenna port QCLed with the DMRS antenna port.
  • the information may explicitly indicate an RS port or a resource ID or may be implicitly obtained.
  • the information (or QCL indication) or indication may be applied to only a scheduled PDSCH or may be applied up to only the following indication.
  • a candidate signaling method of beam indication for an NR-PDCCH may be MAC CE signaling, RRC signaling, DCI signaling, specification transparent and/or implicit method or combinations of them.
  • Tx/Rx beam for a DL data channel is the same as a Tx/Rx beam for a DL control channel may be taken into consideration.
  • a DMRS may be shared for control channel and data channel demodulation in order to reduce DMRS overhead. Additional beam information for an NR-PDSCH capable of reducing signaling overhead does not need to be indicated.
  • FIG. 10 shows an example of a control channel and in which different beams are used for corresponding data channel transmission to which a method proposed in this specification may be applied.
  • a decoupling beam is permitted for a control channel and a data channel, more freedom may be provide to optimize a data beam.
  • a serving Tx beam for an NR-PDSCH may be sharper than a serving Tx beam for an NR-PDCCH in order to improve a data throughput.
  • NR-PDSCH beam information may be dynamically signaled through a corresponding NR-PDCCH.
  • a time gap may be necessary between the control channel and the data channel due to beam switching latency. Likewise, the time gap may be necessary even in FIG. 9 .
  • Such a characteristic may depend on a UE capability regarding beam switching latency.
  • the Rx beams (or Tx-Rx beam association, beam pair link (BPL)) of a control channel and a data channel may be differently configured for dynamic point selection and flexible data transmission.
  • the NR-PDSCH beam indication may indicate information indicating an RS port spatially QCLed with a DMRS port for PDSCH demodulation, for Rx beam setting.
  • a corresponding eNB is aware of the decoding capability of the UE and UE capability information regarding the beam switching latency by previously forwarding them through a higher layer signal (RRC message, MAC-CE, etc.).
  • the DCI signaling may indicate a specific Rx beam within a PDSCH Rx beam (or BPL) pre-configured through RRC or a MAC-CE or may indicate that the specific Rx beam is received as a characteristic beam pair within a beam pair group configured as the Rx beam of a PDCCH.
  • a “00” value may indicate that a PDSCH is received through a pre-designated default Rx beam or a PDSCH is received through the same beam as a PDCCH Rx beam.
  • a “01” value may indicate that a PDSCH is received through a pre-configured secondary Rx (or secondary BPL).
  • “10” and “11” values may indicate that a PDSCH is received through a pre-configured 3 rd Rx beam, 4 th Rx beam.
  • a UE operation according to such a PDSCH beam indication may be as follows.
  • the PDSCH beam indication is “00” and indicates that a PDSCH is received through the same Rx beam as a PDCCH Rx beam
  • an OFDM symbol offset necessary between a DL grant and a corresponding PDSCH is “x” by taking into consideration DCI decoding latency
  • the UE may expect that the corresponding PDSCH is started or received after an (n+x)-th OFDM symbol.
  • an eNB may dynamically indicate the reception position (or timing) of DL data through DCI.
  • the DCI may indicate and indicate that the reception of the DL data is after at least the (n+x)-th OFDM symbol.
  • the beam indication is set as “00” and indicates that a PDSCH is received through a default Rx beam or is set as “01”, “10” or “11” and indicates that a PDSCH is received through an Rx beam different from a PDCCH Rx beam
  • An eNB previously configures the default PDSCH Rx beam through RRC or a MAC-CE, and a corresponding default PDSCH Rx beam may be different from a PDCCH Rx beam.
  • an OFDM symbol offset necessary between a DL grant and corresponding PDSCH reception is “y (y may be greater than or equal to x)” by taking into consideration DCI decoding latency and beam switching latency at the same time, if a UE has received the DL grant in an n-th OFDM symbol from an eNB, the UE may expect that a corresponding PDSCH starts (or is received) after an (n+y)-th OFDM symbol.
  • the UE may neglect it and receive the PDSCH from the eNB after “n+x.”
  • the eNB may dynamically indicate the reception position of the DL data through DCI.
  • the DCI may indicate that the reception position of the DL data is limited after at least n+y.
  • the PDSCH beam indication may include the Rx beam indication of a subsequent slot, not a corresponding slot, by taking the beam switching latency into consideration. For example, beam indication for the PDSCH reception of an (n+x)-th slot through DCI may be possible in an n-th slot.
  • NR-PDSCH beam information may be dynamically signaled through an NR-PDCCH.
  • an NR needs to aim at low overhead indication for a spatial QCL assumption.
  • PDSCH RE mapping information that may include a PDSCH start symbol. That is, in some cases, it is necessary to provide a ZP CSI-RS resource ID, a beam switching time gap and a DCI decoding time for protecting the CSI-RS of a neighbor beam.
  • to support the dynamic switching of an NR-PDSCH beam may be similar to a coordinated multiple point (CoMP) DPS in the spec. influence viewpoint.
  • CoMP coordinated multiple point
  • a UE may be assumed to have a spatial QCL assumption from CRI indication in each NR-PQI state which may be updated by MAC control element (CE) signaling.
  • CE MAC control element
  • one of NR-PQI states indicates a default mode not having CRI indication, it is assumed that a UE has the same spatial QCL assumption between the DMRS of a PDCCH and the DMRS of a PDSCH.
  • An NR-PQI included in DCI may be used as follows with respect to NR-PDSCH beam indication.
  • One of the NR-PQI states is used for a default mode assumed to have the same spatial QCL assumption between the DMRS of a PDCCH and the DMRS of a PDSCH.
  • a UE assumes the DMRS of a PDSCH and the DMRS of a PDCCH to be the same spatial QCL assumption.
  • An eNB previously indicated/configure it.
  • the bit side of the PQI field may be increased by an eNB indication/configuration (e.g., RRC signaling) by taking into consideration a CoMP operation.
  • an eNB indication/configuration e.g., RRC signaling
  • one part such as the PDSCH RE mapping, QCL configuration of the PQI state description may be omitted or updated through MAC-CE signaling.
  • a UE receives a beam reference signal used for beam management from an eNB through a first Rx beam (S 1110 ).
  • the UE reports, to the eNB, a measurement result according to the beam reference signal (S 1120 ).
  • control information may indicate a resource quasi co-located (QCL) with the resource of a demodulation reference signal (DMRS) for the PDCCH reception, as described above.
  • QCL resource quasi co-located
  • DMRS demodulation reference signal
  • control information may be represented as a bitmap.
  • the UE may receive, from the eNB, information indicating a specific beam set configured for each specific time unit through second signaling.
  • the UE receives the specific signal through the second Rx beam based on the received control information (S 1140 ).
  • the control information may be configured for each specific resource and received from the eNB.
  • the specific resource may mean a PDCCH or a CORESET.
  • the specific time domain may include at least one time gap determined by taking into consideration at least one of the decoding time of the control information or beam switching latency between Rx beams for the reception of a plurality of PDCCHs.
  • the UE may transmit, to the eNB, UE capability information indicating the capability of the UE related to the beam switching latency.
  • a corresponding step may be performed prior to step S 1110 .
  • the UE may receive, from the eNB, information related to the at least one time gap.
  • the information related to the at least one time gap may include at least one of the number of time gaps included in the specific time domain or duration of the time gap.
  • the eNB may transmit, to the UE, a confirm message for providing notification of the updated information related to the beam.
  • the UE may receive, from the eNB, information on an Rx beam related to the PDSCH reception, which will be described in FIG. 12 later. In this case, contents described in FIG. 12 may be applied to FIG. 11 .
  • FIG. 12 is a flowchart showing an example of a method of indicating a PDSCH Rx beam using a physical control channel, which is proposed in this specification.
  • FIG. 11 The above-described contents of FIG. 11 may also be applied to FIG. 12 .
  • the following contents may be performed after the contents of FIG. 11 or the following contents may be separately performed.
  • a UE may receive, from the eNB, indication information indicating a third Rx beam for receiving the PDSCH (S 1210 ).
  • the UE receives a physical downlink shared channel (PDSCH) from the eNB based on the indication information (S 1220 ).
  • PDSCH physical downlink shared channel
  • Step S 1220 may be performed prior to step S 1210 .
  • the indication information may indicate a pre-configured Rx beam or may indicate the same Rx beam as the second Rx beam.
  • the pre-configured Rx beam may be represented as a default Rx beam.
  • the second Rx beam may indicate an Rx beam for receiving a PDCCH.
  • the UE may receive, from the eNB, the PDSCH after a specific offset from timing in which the indication information was received.
  • the specific offset may be determined by taking into consideration at least one of a decoding time for the indication information or beam switching latency.
  • a wireless communication system includes an eNB (or network) 1310 and a UE 1320 .
  • the eNB 1310 includes a processor 1311 , a memory 1312 , and a communication module 1313 .
  • the processor 1311 implements the functions, processes and/or methods proposed in FIGS. 1 to 12 .
  • the layers of a wired/wireless interface protocol may be implemented by the processor 1311 .
  • the memory 1312 is connected to the processor 1311 and stores various types of information for driving the processor 1311 .
  • the communication module 1313 is connected to the processor 1311 and transmits and/or receives wired/wireless signals.
  • the communication module 1313 may include a radio frequency (RF) unit for transmitting/receiving a radio signal.
  • RF radio frequency
  • the memory 1312 , 1322 may be positioned inside or outside the processor 1311 , 1321 and may be connected to the processor 1311 , 1321 by various well-known means.
  • the eNB 1310 and/or the UE 1320 may have a single antenna or multiple antennas.
  • FIG. 14 illustrates a block diagram of a communication device according to an embodiment of the present invention.
  • FIG. 14 is a diagram illustrating the UE of FIG. 13 more specifically.
  • the UE may include a processor (or digital signal processor (DSP)) 1410 , an RF module (or RF unit) 1435 , a power management module 1405 , an antenna 1440 , a battery 1455 , a display 1415 , a keypad 1420 , a memory 1430 , a subscriber identification module (SIM) card 1425 (this element is optional), a speaker 1445 , and a microphone 1450 .
  • the UE may further include a single antenna or multiple antennas.
  • the processor 1410 implements the function, process and/or method proposed in FIGS. 1 to 12 .
  • the layers of a radio interface protocol may be implemented by the processor 1410 .
  • the memory 1430 is connected to the processor 1410 , and stores information related to the operation of the processor 1410 .
  • the memory 1430 may be positioned inside or outside the processor 1410 and may be connected to the processor 1410 by various well-known means.
  • a user inputs command information, such as a telephone number, by pressing (or touching) a button of the keypad 1420 or through voice activation using the microphone 1450 , for example.
  • the processor 1410 receives such command information and performs processing so that a proper function, such as making a phone call to the telephone number, is performed.
  • Operational data may be extracted from the SIM card 1425 or the memory 1430 .
  • the processor 1410 may recognize and display command information or driving information on the display 1415 , for convenience sake.
  • the RF module 1435 is connected to the processor 1410 and transmits and/or receives RF signals.
  • the processor 1410 delivers command information to the RF module 1435 so that the RF module 1435 transmits a radio signal that forms voice communication data, for example, in order to initiate communication.
  • the RF module 1435 includes a receiver and a transmitter in order to receive and transmit radio signals.
  • the antenna 1440 functions to transmit and receive radio signals. When a radio signal is received, the RF module 1435 delivers the radio signal so that it is processed by the processor 1410 , and may convert the signal into a baseband. The processed signal may be converted into audible or readable information output through the speaker 1445 .
  • the embodiment according to the present invention may be implemented by various means, for example, hardware, firmware, software or a combination of them.
  • the embodiment of the present invention may be implemented using one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, etc.
  • ASICs application-specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, etc.
  • the embodiment of the present invention may be implemented in the form of a module, procedure or function for performing the aforementioned functions or operations.
  • Software code may be stored in the memory and driven by the processor.
  • the memory may be located inside or outside the processor and may exchange data with the processor through a variety of known means.
  • the signal transmission and reception methods using a beam in a wireless communication system of the present invention have been illustrated based on an example in which it is applied to the 3GPP LTE/LTE-A system and 5G, but may be applied to various wireless communication systems in addition to the 3GPP LTE/LTE-A system and 5G.

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