WO2020055098A1 - Procédé et appareil pour effectuer une commande de puissance dans un système de communication sans fil - Google Patents

Procédé et appareil pour effectuer une commande de puissance dans un système de communication sans fil Download PDF

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Publication number
WO2020055098A1
WO2020055098A1 PCT/KR2019/011720 KR2019011720W WO2020055098A1 WO 2020055098 A1 WO2020055098 A1 WO 2020055098A1 KR 2019011720 W KR2019011720 W KR 2019011720W WO 2020055098 A1 WO2020055098 A1 WO 2020055098A1
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WIPO (PCT)
Prior art keywords
wireless device
node
power
transmit power
wireless
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PCT/KR2019/011720
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English (en)
Inventor
Yunjung Yi
Byounghoon Kim
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Lg Electronics Inc.
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Publication date
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Publication of WO2020055098A1 publication Critical patent/WO2020055098A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control

Definitions

  • the present disclosure relates to a power control in a wireless communication system, specifically in an E-UTRA-new radio (NR) dual connectivity (EN-DC).
  • NR E-UTRA-new radio
  • EN-DC E-UTRA-new radio
  • 3rd generation partnership project (3GPP) long-term evolution (LTE) is a technology for enabling high-speed packet communications.
  • 3GPP 3rd generation partnership project
  • LTE long-term evolution
  • Many schemes have been proposed for the LTE objective including those that aim to reduce user and provider costs, improve service quality, and expand and improve coverage and system capacity.
  • the 3GPP LTE requires reduced cost per bit, increased service availability, flexible use of a frequency band, a simple structure, an open interface, and adequate power consumption of a terminal as an upper-level requirement.
  • ITU international telecommunication union
  • NR new radio
  • 3GPP has to identify and develop the technology components needed for successfully standardizing the new RAT timely satisfying both the urgent market needs, and the more long-term requirements set forth by the ITU radio communication sector (ITU-R) international mobile telecommunications (IMT)-2020 process.
  • ITU-R ITU radio communication sector
  • IMT international mobile telecommunications
  • the NR should be able to use any spectrum band ranging at least up to 100 GHz that may be made available for wireless communications even in a more distant future.
  • the NR targets a single technical framework addressing all usage scenarios, requirements and deployment scenarios including enhanced mobile broadband (eMBB), massive machine-type-communications (mMTC), ultra-reliable and low latency communications (URLLC), etc.
  • eMBB enhanced mobile broadband
  • mMTC massive machine-type-communications
  • URLLC ultra-reliable and low latency communications
  • the NR shall be inherently forward compatible.
  • E-UTRA-new radio (NR) dual connectivity is a 3GPP release 15 feature introduced to support NR 5G data with existing LTE core and radio networks and without introducing 5G core network.
  • EN-DC can be a useful feature for heterogeneous networks where LTE provides reliable coverage and NR can be used for improving data rates.
  • EN-DC ensures better system reliability by reducing service interruptions due to higher propagation loss in mmwave or non-line of sight situations in massive multiple-input multiple-output (MIMO).
  • MIMO massive multiple-input multiple-output
  • EN-DC power control and/or power sharing between E-UTRAN and NR should be addressed.
  • the present disclosure discusses power control and/or power sharing in EN-DC for intra-band/inter-band.
  • a method performed by a wireless device in a wireless communication system includes computing a lower bound of a configured transmit power in a power computation period based on a maximum of additional maximum power reductions (A-MPRs) at each of overlapped time intervals between the first node and the second node, and determining the configured transmit power based on the lower bound of the configured transmit power.
  • RATs radio access technologies
  • A-MPRs additional maximum power reductions
  • FIG. 1 shows an example of a communication system to which the technical features of the present disclosure can be applied.
  • FIG. 2 shows an example of wireless devices to which the technical features of the present disclosure can be applied.
  • FIG. 3 shows an example of a signal processing circuit for a transmission signal to which the technical features of the present disclosure can be applied.
  • FIG. 4 shows another example of a wireless device to which the technical features of the present disclosure can be applied.
  • FIG. 5 shows an example of a hand-held device to which the technical features of the present disclosure can be applied.
  • FIG. 6 shows an example of a wireless communication system to which the technical features of the present disclosure can be applied.
  • FIG. 7 shows another example of a wireless communication system to which the technical features of the present disclosure can be applied.
  • FIG. 8 shows an example of a frame structure to which technical features of the present disclosure can be applied.
  • FIG. 9 shows another example of a frame structure to which technical features of the present disclosure can be applied.
  • FIG. 10 shows an example of a subframe structure used to minimize latency of data transmission when TDD is used in NR.
  • FIG. 11 shows an example of a resource grid to which technical features of the present disclosure can be applied.
  • FIG. 12 shows an example of a synchronization channel to which technical features of the present disclosure can be applied.
  • FIG. 13 shows an example of a frequency allocation scheme to which technical features of the present disclosure can be applied.
  • FIG. 14 shows an example of multiple BWPs to which technical features of the present disclosure can be applied.
  • FIG. 15 shows an example of a slot structure to which the technical features of the present disclosure can be applied.
  • FIG. 16 shows an example of a slot structure to which the technical features of the present disclosure can be applied.
  • FIG. 17 shows an example of computation of PCMAX_L according to the embodiment of the present disclosure.
  • FIG. 18 shows an example of a method for computing a lower bound of a configured transmit power (i.e., PCMAX_L) according to the embodiment of the present disclosure.
  • the technical features described below may be used by a communication standard by the 3rd generation partnership project (3GPP) standardization organization, a communication standard by the institute of electrical and electronics engineers (IEEE), etc.
  • the communication standards by the 3GPP standardization organization include long-term evolution (LTE) and/or evolution of LTE systems.
  • LTE long-term evolution
  • LTE-A LTE-advanced
  • LTE-A Pro LTE-A Pro
  • NR 5G new radio
  • the communication standard by the IEEE standardization organization includes a wireless local area network (WLAN) system such as IEEE 802.11a/b/g/n/ac/ax.
  • WLAN wireless local area network
  • the above system uses various multiple access technologies such as orthogonal frequency division multiple access (OFDMA) and/or single carrier frequency division multiple access (SC-FDMA) for downlink (DL) and/or uplink (UL).
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • OFDMA and SC-FDMA may be used for DL and/or UL.
  • the term “/” and “,” should be interpreted to indicate “and/or.”
  • the expression “A/B” may mean “A and/or B.”
  • A, B may mean “A and/or B.”
  • A/B/C may mean “at least one of A, B, and/or C.”
  • A, B, C may mean “at least one of A, B, and/or C.”
  • the term “or” should be interpreted to indicate “and/or.”
  • the expression “A or B” may comprise 1) only A, 2) only B, and/or 3) both A and B.
  • the term “or” in this document should be interpreted to indicate "additionally or alternatively.”
  • FIG. 1 shows an example of a communication system to which the technical features of the present disclosure can be applied.
  • a communication system 1 to which the technical features of the present disclosure can be applied includes a wireless device, a base station and a network.
  • the wireless device refers to a device that performs communication using a radio access technology (e.g., 5G new radio access technology (NR), long-term evolution (LTE)), and may be referred to as a communication / wireless / 5G device.
  • a radio access technology e.g., 5G new radio access technology (NR), long-term evolution (LTE)
  • NR new radio access technology
  • LTE long-term evolution
  • the wireless device may include a robot 100a, a vehicle 100b-1, 100b-2, an extended reality (XR) device 100c, a hand-held device 100d, a home appliance 100e, an internet of things (IoT) device 100f and an artificial intelligence (AI) device / server 400.
  • XR extended reality
  • IoT internet of things
  • AI artificial intelligence
  • the vehicle may include a vehicle having a wireless communication function, an autonomous vehicle, a vehicle capable of performing inter-vehicle communication, etc.
  • the vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone).
  • UAV unmanned aerial vehicle
  • the XR device may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices.
  • the XR device may be implemented in the form of head-mounted device (HMD), head-up display (HUD) provided in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, etc.
  • HMD head-mounted device
  • HUD head-up display
  • the hand-held device device may include a smartphone, a smart pad, a wearable device (e.g., a smart watch, smart glasses), a computer (e.g., a laptop, etc.).
  • the home appliance may include a TV, a refrigerator, a washing machine, etc.
  • the IoT device may include a sensor, a smart meter, etc.
  • the base station and the network may be implemented as a wireless device.
  • a specific wireless device 200a may operate as a base station / network node to other wireless devices.
  • the wireless devices 100a to 100f may be connected to the network 300 through the base station 200.
  • AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI server 400 through the network 300.
  • the network 300 may be configured using a 3G network, a 4G (e.g., LTE) network and/or a 5G (e.g., NR) network.
  • the wireless devices 100a to 100f may communicate with each other via the base station 200 / network 300, but may also communicate directly (e.g., sidelink communication) without passing through the base station 200 / network 300.
  • the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication).
  • the IoT device e.g., sensor
  • the IoT device may directly communicate with another IoT device (e.g., sensor) or another wireless device 100a to 100f.
  • Wireless communication / connections 150a, 150b, and 150c may be performed between the wireless devices 100a to 100f and the base station 200 and/or between the base stations 200.
  • the wireless communication / connection may be performed by various wireless access technologies (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication (or device-to-device (D2D)) communication) 150b, inter-base station communication 150c (e.g., relay, integrated access and backhaul (IAB)), etc.
  • the wireless device and the base station / wireless device and/or the base stations may transmit / receive wireless signals with each other respectively through the wireless communication / connection 150a, 150b, and 150c.
  • wireless communications / connections 150a, 150b, and 150c may transmit / receive signals over various physical channels.
  • various signal processing processes e.g., channel encoding / decoding, modulation / demodulation, resource mapping / de-mapping, etc.
  • resource allocation process for transmitting / receiving a wireless signal.
  • FIG. 2 shows an example of wireless devices to which the technical features of the present disclosure can be applied.
  • the first wireless device 100 and the second wireless device 200 may transmit and receive wireless signals through various wireless access technologies (e.g., LTE, NR).
  • ⁇ the first wireless device 100 and the second wireless device 200 ⁇ may correspond to ⁇ the wireless device 100x, the base station 200 ⁇ and/or ⁇ the wireless device 100x, the wireless device 100x ⁇ in FIG. 1.
  • the first wireless device 100 may include one or more processors 102 and one or more memories 104.
  • the first wireless device 100 may further include one or more transceivers 106 and/or one or more antennas 108.
  • the processor 102 may control the memory 104 and/or the transceiver 106.
  • the processor 102 may be configured to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate the first information/signal, and then transmit a wireless signal including the first information/signal through the transceiver 106.
  • the processor 102 may receive a wireless signal including the second information/signal through the transceiver 106 and then store information obtained from signal processing of the second information/signal in the memory 104.
  • the memory 104 may be coupled to the processor 102 and may store various information related to the operation of the processor 102.
  • the memory 104 may include software code that includes instructions for performing some or all of the processes controlled by the processor 102 and/or for carrying out the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein.
  • processor 102 and memory 104 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR).
  • the transceiver 106 may be coupled with the processor 102 and may transmit and/or receive wireless signals via one or more antennas 108.
  • the transceiver 106 may include a transmitter and/or a receiver.
  • the transceiver 106 may be mixed with a radio frequency (RF) unit.
  • RF radio frequency
  • a wireless device may mean a communication modem / circuit / chip.
  • the second wireless device 200 may include one or more processors 202 and one or more memories 204.
  • the second wireless device 200 may further include one or more transceivers 206 and/or one or more antennas 208.
  • the processor 202 may control the memory 204 and/or the transceiver 206.
  • the processor 202 may be configured to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein. For example, the processor 202 may process information in the memory 204 to generate the third information/signal, and then transmit a wireless signal including the third information/signal through the transceiver 206.
  • the processor 202 may receive a wireless signal including the fourth information/signal through the transceiver 206 and then store information obtained from signal processing of the fourth information/signal in the memory 204.
  • the memory 204 may be coupled to the processor 202 and may store various information related to the operation of the processor 202.
  • the memory 204 may include software code that includes instructions for performing some or all of the processes controlled by the processor 202 and/or for carrying out the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein.
  • processor 202 and memory 204 may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR).
  • the transceiver 206 may be coupled with the processor 202 and may transmit and/or receive wireless signals via one or more antennas 208.
  • the transceiver 206 may include a transmitter and/or a receiver.
  • the transceiver 206 may be mixed with an RF unit.
  • a wireless device may mean a communication modem / circuit / chip.
  • one or more protocol layers may be implemented by one or more processors 102, 202.
  • one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as physical (PHY), media access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), service data adaptation protocol (SDAP), radio resource control (RRC)).
  • layers e.g., functional layers such as physical (PHY), media access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), service data adaptation protocol (SDAP), radio resource control (RRC)
  • PDUs protocol data units
  • SDUs service data units
  • One or more processors 102, 202 may generate messages, control information, data, or information in accordance with the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein.
  • One or more processors 102, 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information in accordance with the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein, and provide to one or more transceivers 106, 206.
  • One or more processors 102, 202 may receive signals (e.g., baseband signals) from one or more transceivers 106, 206, and obtain PDUs, SDUs, messages, control information, data or information in accordance with the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein.
  • signals e.g., baseband signals
  • One or more processors 102, 202 may be referred to as a controller, a microcontroller, a microprocessor, and/or a microcomputer.
  • One or more processors 102, 202 may be implemented by hardware, firmware, software, and/or a combination thereof.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein may be implemented using firmware and/or software, and the firmware and/or software may be implemented to include modules, procedures, functions, etc.
  • Firmware and/or software configured to perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein may be included in one or more processors 102, 202 or stored in one or more memories 104, 204 and may be driven by one or more processors 102, 202.
  • the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein may be implemented using firmware or software in the form of code, instructions and/or a set of instructions.
  • One or more memories 104, 204 may be coupled with one or more processors 102, 202 and may store various forms of data, signals, messages, information, programs, codes, instructions, and/or commands.
  • One or more memories 104, 204 may be comprised of a read-only memory (ROM), a random access memory (RAM), an erasable programmable read-only memory (EPROM), a flash memory, a hard drive, a register, a cache memory, a computer readable storage medium and/or combinations thereof.
  • One or more memories 104, 204 may be located inside and/or outside one or more processors 102, 202.
  • one or more memories 104, 204 may be coupled to one or more processors 102, 202 through various techniques, such as a wired and/or wireless connection.
  • One or more transceivers 106, 206 may transmit user data, control information, wireless signals/channels, etc., as mentioned in the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein, to one or more other devices.
  • One or more transceivers 106, 206 may receive user data, control information, wireless signals/channels, etc., as mentioned in the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein, from one or more other devices.
  • one or more transceivers 106, 206 may be coupled with one or more processors 102, 202 and may transmit and/or receive wireless signals.
  • one or more processors 102, 202 may control one or more transceivers 106, 206 to transmit user data, control information, wireless signals/channels, etc., to one or more other devices.
  • one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, wireless signals/channels, etc., from one or more other devices.
  • one or more transceivers 106, 206 may be coupled to one or more antennas 108, 208.
  • One or more transceivers 106, 206 may be configured to transmit and/or receive user data, control information, wireless signals/channels, etc., as mentioned in the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein, through one or more antennas 108, 208.
  • one or more antennas 108, 208 may be a plurality of physical antennas and/or a plurality of logical antennas (e.g., antenna ports).
  • one or more transceivers 106, 206 may convert the received user data, control information, wireless signals/channels, etc., from an RF band signal to a baseband signal.
  • One or more transceivers 106, 206 may convert user data, control information, wireless signals/channels, etc., processed by using one or more processors 102, 202, from a baseband signal to an RF band signal.
  • one or more transceivers 106, 206 may include (analog) oscillators and/or filters.
  • FIG. 3 shows an example of a signal processing circuit for a transmission signal to which the technical features of the present disclosure can be applied.
  • the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060.
  • operations/functions of FIG. 3 may be performed in processors 102, 202 and/or transceivers 106, 206 of FIG. 2.
  • the hardware element of FIG. 3 may be implemented in processors 102, 202 and/or transceivers 106, 206 of FIG. 2.
  • blocks 1010 to 1060 may be implemented in processors 102, 202 of FIG. 2.
  • blocks 1010 to 1050 may be implemented in processors 102, 202 of FIG. 2
  • block 1060 may be implemented in transceivers 106, 206 of FIG. 2.
  • the codeword may be converted into a wireless signal via the signal processing circuit 1000 of FIG. 3.
  • the codeword is a coded bit sequence of the information block.
  • the information block may include a transport block (e.g., an uplink shared channel (UL-SCH) transport block, a downlink shared channel (DL-SCH) transport block).
  • the wireless signal may be transmitted through various physical channels (e.g., physical uplink shared channel (PUSCH), physical downlink shared channel (PDSCH)).
  • PUSCH physical uplink shared channel
  • PDSCH physical downlink shared channel
  • the codeword may be converted into a scrambled bit sequence by the scrambler 1010.
  • the scramble bit sequence used for scrambling may be generated based on initialization value, and the initialization value may include ID information of the wireless device, etc.
  • the scrambled bit sequence may be modulated into a modulation symbol sequence by the modulator 1020.
  • the modulation scheme may include pi/2-binary phase shift keying (pi/2-BPSK), m-phase shift keying (m-PSK), m-quadrature amplitude modulation (m-QAM), etc.
  • the complex modulation symbol sequence may be mapped to one or more transport layers by the layer mapper 1030.
  • the modulation symbols of each transport layer may be mapped to the corresponding antenna port(s) by the precoder 1040 (precoding).
  • the output z of the precoder 1040 may be obtained by multiplying the output y of the layer mapper 1030 with the precoding matrix W of N*M.
  • N is the number of antenna ports and M is the number of transport layers.
  • the precoder 1040 may perform precoding after performing transform precoding (e.g., discrete Fourier transform (DFT)) on the complex modulation symbols. Also, the precoder 1040 may perform precoding without performing transform precoding.
  • transform precoding e.g., discrete Fourier transform (DFT)
  • the resource mapper 1050 may map modulation symbols of each antenna port to time-frequency resources.
  • the time-frequency resource may include a plurality of symbols (e.g., cyclic prefix based OFDMA (CP-OFDMA) symbols, DFT spread OFDMA (DFT-s-OFDMA) symbols) in the time domain, and may include a plurality of subcarriers in the frequency domain.
  • the signal generator 1060 may generate a wireless signal from the mapped modulation symbols, and the generated wireless signal may be transmitted to another device through each antenna. To this end, the signal generator 1060 may include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), a frequency uplink converter, etc.
  • IFFT inverse fast Fourier transform
  • CP cyclic prefix
  • DAC digital-to-analog converter
  • the signal processing procedure for a reception signal in the wireless device may be configured in the reverse of the signal processing procedure 1010 to 1060 of FIG. 3.
  • a wireless device e.g., 100, 200 of FIG. 2
  • the received wireless signal may be converted into a baseband signal through a signal recoverer.
  • the signal recoverer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP canceller, and a fast Fourier transform (FFT) module.
  • ADC analog-to-digital converter
  • FFT fast Fourier transform
  • the baseband signal may be restored to a codeword through a resource de-mapper process, a postcoding process, a demodulation process, and a de-scrambling process.
  • the codeword may be restored to the original information block through decoding.
  • the signal processing circuit for the reception signal may include a signal recoverer, a resource de-mapper, a postcoder, a demodulator, a de-scrambler and a decoder.
  • FIG. 4 shows another example of a wireless device to which the technical features of the present disclosure can be applied.
  • the wireless device may be implemented in various forms depending on use cases / services (see FIG. 1).
  • the wireless devices 100, 200 may correspond to the wireless devices 100, 200 of FIG. 2, and may be composed of various elements, components, units, and/or modules.
  • the wireless device 100, 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional components 140.
  • the communication unit 110 may include a communication circuitry 112 and transceiver(s) 114.
  • the communication circuitry 112 may include one or more processors 102, 202 and/or one or more memories 104, 204 of FIG. 2.
  • the transceiver(s) 114 may include one or more transceivers 106, 206 and/or one or more antennas 108, 208 of FIG. 2.
  • the control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional components 140, and controls various operations of the wireless device 100, 200.
  • the control unit 120 may control the electrical/mechanical operation of the wireless device 100, 200 based on the program/code/command/information stored in the memory unit 130.
  • control unit 120 may transmit the information stored in the memory unit 130 to the outside (e.g., other communication devices) through the communication unit 110 through a wireless/wired interface, or may store the information received from the outside (e.g., other communication devices) through the wireless/wired interface through the communication unit 110 in the memory unit 130.
  • the additional components 140 may be variously configured according to the type of the wireless device 100, 200.
  • the additional components 140 may include at least one of a power unit/battery, an input/output (I/O) unit, a driver, or a computing unit.
  • the wireless devices 100, 200 may be implemented in the form of robots (FIG. 1, 100a), vehicles (FIG. 1, 100b-1, 100b-2), XR devices (FIG. 1, 100c), hand-held devices (FIG. 1, 100d), home appliances (FIG. 1, 100e), IoT devices (FIG.
  • the wireless device 100, 200 may be used in a mobile or fixed location depending on use cases / services.
  • various elements, components, units, and/or modules within the wireless device 100, 200 may be entirely interconnected via a wired interface, or at least a part of the wireless device 100, 200 may be wirelessly connected through the communication unit 110.
  • the control unit 120 and the communication unit 110 may be connected by wire, and the control unit 120 and the first unit (e.g., 130, 140) may be wirelessly connected through the communication unit 110.
  • each element, component, unit, and/or module in the wireless device 100, 200 may further include one or more elements.
  • the control unit 120 may be composed of one or more processor sets.
  • control unit 120 may be configured as a set of a communication control processor, an application processor (AP), an electronic control unit (ECU), a graphics processing processor, a memory control processor, etc.
  • memory unit 130 may include RAM, a dynamic RAM (DRAM), ROM, a flash memory, a volatile memory, a non-volatile memory, and/or combinations thereof.
  • FIG. 5 shows an example of a hand-held device to which the technical features of the present disclosure can be applied.
  • the hand-held device 100 may include a smart phone, a smart pad, a wearable device (e.g., a smart watch, smart glasses), a portable computer (e.g., a notebook, etc.).
  • the hand-held device 100 may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).
  • MS mobile station
  • UT user terminal
  • MSS mobile subscriber station
  • SS subscriber station
  • AMS advanced mobile station
  • WT wireless terminal
  • the hand-held device 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an I/O unit 140c.
  • the antenna unit 108 may be configured as a part of the communication unit 110.
  • Blocks 110 to 130 / 140a to 140c may correspond to blocks 110 to 130 / 140 of FIG 4, respectively.
  • the communication unit 110 may transmit and/or receive signals (e.g., data, control signals, etc.) with other wireless devices and base stations.
  • the control unit 120 may control various components of the hand-held device 100 to perform various operations.
  • the control unit 120 may include an AP.
  • the memory unit 130 may store data, parameters, programs, codes and/or commands necessary for driving the hand-held device 100.
  • the memory unit 130 may store input/output data/information, etc.
  • the power supply unit 140a may supply power to the hand-held device 100 and may include a wired/wireless charging circuit, a battery, etc.
  • the interface unit 140b may support connection of the hand-held device 100 to another external device.
  • the interface unit 140b may include various ports (e.g., audio input/output ports, video input/output ports, etc.) for connecting to an external device.
  • the I/O unit 140c may receive and/or output image information/signal, audio information/signal, data and/or information input from a user.
  • the I/O unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker and/or a haptic module.
  • the I/O unit 140c may obtain information/signals (e.g., touch, text, voice, image, and video) input from the user, and the obtained information/signals may be stored in the memory unit 130.
  • the communication unit 110 may convert the information/signals stored in the memory unit 130 into a wireless signal.
  • the communication unit 110 may directly transmit the converted wireless signal to another wireless device or may transmit the converted wireless signal to a base station.
  • the communication unit 110 may receive a wireless signal from another wireless device or a base station, and then restore the received wireless signal to original information/signal.
  • the restored information/signal may be stored in the memory unit 130 and then output in various forms (e.g., text, voice, image, video, and haptic) through the I/O unit 140c.
  • FIG. 6 shows an example of a wireless communication system to which the technical features of the present disclosure can be applied.
  • FIG. 6 shows a system architecture based on an evolved-UMTS terrestrial radio access network (E-UTRAN).
  • E-UTRAN evolved-UMTS terrestrial radio access network
  • the aforementioned LTE is a part of an evolved-UTMS (e-UMTS) using the E-UTRAN.
  • e-UMTS evolved-UTMS
  • the wireless communication system includes one or more user equipment (UE) 100, an E-UTRAN and an evolved packet core (EPC).
  • the UE 100 refers to a communication equipment carried by a user.
  • the UE 100 may be fixed or mobile.
  • the UE 100 may be referred to as another terminology, such as MS, UT, SS, a wireless device, etc.
  • the UE 100 may correspond to the wireless device 100x of FIG. 1, the first wireless device 100 of FIG. 2, the wireless device 100 of FIG. 4, or the hand-held device 100 of FIG. 5.
  • the E-UTRAN consists of one or more evolved NodeB (eNB) 200.
  • the eNB 200 provides the E-UTRA user plane and control plane protocol terminations towards the UE 100.
  • the eNB 200 is generally a fixed station that communicates with the UE 100.
  • the eNB 200 hosts the functions, such as inter-cell radio resource management (RRM), radio bearer (RB) control, connection mobility control, radio admission control, measurement configuration/provision, dynamic resource allocation (scheduler), etc.
  • RRM inter-cell radio resource management
  • RB radio bearer
  • connection mobility control connection mobility control
  • radio admission control measurement configuration/provision
  • dynamic resource allocation service provider
  • the eNB 200 may be referred to as another terminology, such as a base station (BS), a base transceiver system (BTS), an access point (AP), etc.
  • the eNB 200 may correspond to the base station 200 of FIG. 1, the second wireless device 200 of FIG. 2, or the wireless device 200 of FIG. 4.
  • a downlink (DL) denotes communication from the eNB 200 to the UE 100.
  • An uplink (UL) denotes communication from the UE 100 to the eNB 200.
  • a sidelink (SL) denotes communication between the UEs 100.
  • a transmitter may be a part of the eNB 200, and a receiver may be a part of the UE 100.
  • the transmitter may be a part of the UE 100, and the receiver may be a part of the eNB 200.
  • the transmitter and receiver may be a part of the UEs 100.
  • the EPC includes a mobility management entity (MME), a serving gateway (S-GW) and a packet data network (PDN) gateway (P-GW).
  • MME mobility management entity
  • S-GW serving gateway
  • PDN packet data network gateway
  • the MME hosts the functions, such as non-access stratum (NAS) security, idle state mobility handling, evolved packet system (EPS) bearer control, etc.
  • the S-GW hosts the functions, such as mobility anchoring, etc.
  • the S-GW is a gateway having an E-UTRAN as an endpoint.
  • MME/S-GW 300 will be referred to herein simply as a "gateway," but it is understood that this entity includes both the MME and S-GW.
  • the P-GW hosts the functions, such as UE Internet protocol (IP) address allocation, packet filtering, etc.
  • IP Internet protocol
  • the P-GW is a gateway having a PDN as an endpoint.
  • the P-GW is connected to an external network.
  • the MME/S-GW 300
  • the UE 100 is connected to the eNB 200 by means of the Uu interface.
  • the UEs 100 are interconnected with each other by means of the PC5 interface.
  • the eNBs 200 are interconnected with each other by means of the X2 interface.
  • the eNBs 200 are also connected by means of the S1 interface to the EPC, more specifically to the MME by means of the S1-MME interface and to the S-GW by means of the S1-U interface.
  • the S1 interface supports a many-to-many relation between MMEs / S-GWs and eNBs.
  • FIG. 7 shows another example of a wireless communication system to which the technical features of the present disclosure can be applied.
  • FIG. 7 shows a system architecture based on a 5G NR.
  • the entity used in the 5G NR (hereinafter, simply referred to as "NR") may absorb some or all of the functions of the entities introduced in FIG. 6 (e.g., eNB, MME, S-GW).
  • the entity used in the NR may be identified by the name "NG” for distinction from the LTE/LTE-A.
  • the wireless communication system includes one or more UE 100, a next-generation RAN (NG-RAN) and a 5th generation core network (5GC).
  • the NG-RAN consists of at least one NG-RAN node.
  • the NG-RAN node is an entity corresponding to the eNB 200 shown in FIG. 6.
  • the NG-RAN node consists of at least one gNB 200 and/or at least one ng-eNB 200.
  • the gNB 200 provides NR user plane and control plane protocol terminations towards the UE 100.
  • the ng-eNB 200 provides E-UTRA user plane and control plane protocol terminations towards the UE 100.
  • the gNB 200 and/or ng-eNB 200 may correspond to the base station 200 of FIG. 1, the second wireless device 200 of FIG. 2, or the wireless device 200 of FIG. 4.
  • the 5GC includes an access and mobility management function (AMF), a user plane function (UPF) and a session management function (SMF).
  • AMF hosts the functions, such as NAS security, idle state mobility handling, etc.
  • the AMF is an entity including the functions of the conventional MME.
  • the UPF hosts the functions, such as mobility anchoring, PDU handling.
  • the UPF an entity including the functions of the conventional S-GW.
  • the SMF hosts the functions, such as UE IP address allocation, PDU session control.
  • the gNBs 200 and ng-eNBs 200 are interconnected with each other by means of the Xn interface.
  • the gNBs 200 and ng-eNBs 200 are also connected by means of the NG interfaces to the 5GC, more specifically to the AMF by means of the NG-C interface and to the UPF by means of the NG-U interface.
  • one radio frame consists of 10 subframes, and one subframe consists of 2 slots.
  • a length of one subframe may be 1ms, and a length of one slot may be 0.5ms.
  • Time for transmitting one transport block by higher layer to physical layer is defined as a transmission time interval (TTI).
  • TTI may be the minimum unit of scheduling.
  • DL and UL transmissions are performed over a radio frame with a duration of 10ms.
  • Each radio frame includes 10 subframes. Thus, one subframe corresponds to 1ms.
  • Each radio frame is divided into two half-frames.
  • NR supports various numerologies, and accordingly, the structure of the radio frame may be varied.
  • NR supports multiple subcarrier spacings in frequency domain.
  • Table 1 shows multiple numerologies supported in NR. Each numerology may be identified by index ⁇ .
  • a subcarrier spacing may be set to any one of 15, 30, 60, 120, and 240 kHz, which is identified by index ⁇ .
  • transmission of user data may not be supported depending on the subcarrier spacing. That is, transmission of user data may not be supported only in at least one specific subcarrier spacing (e.g., 240 kHz).
  • a synchronization channel (e.g., a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH)) may not be supported depending on the subcarrier spacing. That is, the synchronization channel may not be supported only in at least one specific subcarrier spacing (e.g., 60 kHz).
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • PBCH physical broadcast channel
  • a number of slots and a number of symbols included in one radio frame/subframe may be different according to various numerologies, i.e., various subcarrier spacings.
  • Table 2 shows an example of a number of OFDM symbols per slot (N symb slot ), a number of slots per radio frame (N symb frame, ⁇ ), and a number of slots per subframe (N symb subframe, ⁇ ) for each numerology in normal cyclic prefix (CP).
  • Table 3 shows an example of a number of OFDM symbols per slot (N symb slot ), a number of slots per radio frame (N symb frame, ⁇ ), and a number of slots per subframe (N symb subframe, ⁇ ) for each numerology in extended CP.
  • One radio frame includes 10 subframes, one subframe includes to 4 slots, and one slot consists of 12 symbols.
  • a symbol refers to a signal transmitted during a specific time interval.
  • a symbol may refer to a signal generated by OFDM processing. That is, a symbol in the present disclosure may refer to an OFDM/OFDMA symbol, or SC-FDMA symbol, etc.
  • a CP may be located between each symbol.
  • FIG. 8 shows an example of a frame structure to which technical features of the present disclosure can be applied.
  • FIG. 9 shows another example of a frame structure to which technical features of the present disclosure can be applied.
  • a frequency division duplex (FDD) and/or a time division duplex (TDD) may be applied to a wireless communication system to which an embodiment of the present disclosure is applied.
  • FDD frequency division duplex
  • TDD time division duplex
  • LTE/LTE-A UL subframes and DL subframes are allocated in units of subframes.
  • symbols in a slot may be classified as a DL symbol (denoted by D), a flexible symbol (denoted by X), and a UL symbol (denoted by U).
  • a slot in a DL frame the UE shall assume that DL transmissions only occur in DL symbols or flexible symbols.
  • the UE shall only transmit in UL symbols or flexible symbols.
  • the flexible symbol may be referred to as another terminology, such as reserved symbol, other symbol, unknown symbol, etc.
  • Table 4 shows an example of a slot format which is identified by a corresponding format index.
  • the contents of the Table 4 may be commonly applied to a specific cell, or may be commonly applied to adjacent cells, or may be applied individually or differently to each UE.
  • Table 4 shows only a part of the slot format actually defined in NR.
  • the specific allocation scheme may be changed or added.
  • the UE may receive a slot format configuration via a higher layer signaling (i.e., RRC signaling). Or, the UE may receive a slot format configuration via downlink control information (DCI) which is received on PDCCH. Or, the UE may receive a slot format configuration via combination of higher layer signaling and DCI.
  • a higher layer signaling i.e., RRC signaling
  • DCI downlink control information
  • the UE may receive a slot format configuration via combination of higher layer signaling and DCI.
  • FIG. 10 shows an example of a subframe structure used to minimize latency of data transmission when TDD is used in NR.
  • the subframe structure shown in FIG. 10 may be called a self-contained subframe structure.
  • the subframe includes DL control channel in the first symbol, and UL control channel in the last symbol. The remaining symbols may be used for DL data transmission and/or for UL data transmission.
  • DL transmission and UL transmission may sequentially proceed in one subframe.
  • the UE may both receive DL data and transmit UL acknowledgement/non-acknowledgement (ACK/NACK) in the subframe. As a result, it may take less time to retransmit data when a data transmission error occurs, thereby minimizing the latency of final data transmission.
  • ACK/NACK UL acknowledgement/non-acknowledgement
  • a time gap may be required for the transition process from the transmission mode to the reception mode or from the reception mode to the transmission mode.
  • some symbols at the time of switching from DL to UL in the subframe structure may be set to the guard period (GP).
  • FIG. 11 shows an example of a resource grid to which technical features of the present disclosure can be applied.
  • FIG. 11 is a time-frequency resource grid used in NR.
  • An example shown in FIG. 11 may be applied to UL and/or DL.
  • multiple slots are included within one subframe on the time domain.
  • "14 ⁇ 2 ⁇ ” symbols may be expressed in the resource grid.
  • one resource block (RB) may occupy 12 consecutive subcarriers.
  • One RB may be referred to as a physical resource block (PRB), and 12 resource elements (REs) may be included in each PRB.
  • the number of allocatable RBs may be determined based on a minimum value and a maximum value.
  • the number of allocatable RBs may be configured individually according to the numerology (“ ⁇ ").
  • the number of allocatable RBs may be configured to the same value for UL and DL, or may be configured to different values for UL and DL.
  • the UE may perform cell search in order to acquire time and/or frequency synchronization with a cell and to acquire a cell identifier (ID).
  • Synchronization channels such as PSS, SSS, and PBCH may be used for cell search.
  • FIG. 12 shows an example of a synchronization channel to which technical features of the present disclosure can be applied.
  • the PSS and SSS may include one symbol and 127 subcarriers.
  • the PBCH may include 3 symbols and 240 subcarriers.
  • the PSS is used for SS/PBCH block symbol timing acquisition.
  • the PSS indicates 3 hypotheses for cell ID identification.
  • the SSS is used for cell ID identification.
  • the SSS indicates 336 hypotheses. Consequently, 1008 physical layer cell IDs may be configured by the PSS and the SSS.
  • the SS/PBCH block may be repeatedly transmitted according to a predetermined pattern within the 5ms window. For example, when L SS/PBCH blocks are transmitted, all of SS/PBCH block #1 through SS/PBCH block #L may contain the same information, but may be transmitted through beams in different directions. That is, quasi co-located (QCL) relationship may not be applied to the SS/PBCH blocks within the 5ms window.
  • the beams used to receive the SS/PBCH block may be used in subsequent operations between the UE and the network (e.g., random access operations).
  • the SS/PBCH block may be repeated by a specific period. The repetition period may be configured individually according to the numerology.
  • the PBCH has a bandwidth of 20 RBs for the 2nd/4th symbols and 8 RBs for the 3rd symbol.
  • the PBCH includes a demodulation reference signal (DM-RS) for decoding the PBCH.
  • DM-RS demodulation reference signal
  • the frequency domain for the DM-RS is determined according to the cell ID.
  • a special DM-RS is defined for decoding the PBCH (i.e., PBCH-DMRS).
  • PBCH-DMRS may contain information indicating an SS/PBCH block index.
  • the PBCH performs various functions.
  • the PBCH may perform a function of broadcasting a master information block (MIB).
  • MIB master information block
  • SI System information
  • SIB1 system information block type-1
  • SIB1 system information block type-1
  • RMSI remaining minimum SI
  • the MIB includes information necessary for decoding SIB1.
  • the MIB may include information on a subcarrier spacing applied to SIB1 (and MSG 2/4 used in the random access procedure, other SI), information on a frequency offset between the SS/PBCH block and the subsequently transmitted RB, information on a bandwidth of the PDCCH/SIB, and information for decoding the PDCCH (e.g., information on search-space/control resource set (CORESET)/DM-RS, etc., which will be described later).
  • the MIB may be periodically transmitted, and the same information may be repeatedly transmitted during 80ms time interval.
  • the SIB1 may be repeatedly transmitted through the PDSCH.
  • the SIB1 includes control information for initial access of the UE and information for decoding another SIB.
  • the search space for the PDCCH corresponds to aggregation of control channel candidates on which the UE performs blind decoding.
  • the search space for the PDCCH is divided into a common search space (CSS) and a UE-specific search space (USS).
  • the size of each search space and/or the size of a control channel element (CCE) included in the PDCCH are determined according to the PDCCH format.
  • a resource-element group (REG) and a CCE for the PDCCH are defined.
  • the concept of CORESET is defined.
  • one REG corresponds to 12 REs, i.e., one RB transmitted through one OFDM symbol.
  • Each REG includes a DM-RS.
  • One CCE includes a plurality of REGs (e.g., 6 REGs).
  • the PDCCH may be transmitted through a resource consisting of 1, 2, 4, 8, or 16 CCEs. The number of CCEs may be determined according to the aggregation level.
  • one CCE when the aggregation level is 1, 2 CCEs when the aggregation level is 2, 4 CCEs when the aggregation level is 4, 8 CCEs when the aggregation level is 8, 16 CCEs when the aggregation level is 16, may be included in the PDCCH for a specific UE.
  • the CORESET is a set of resources for control signal transmission.
  • the CORESET may be defined on 1/2/3 OFDM symbols and multiple RBs.
  • the number of symbols used for the PDCCH is defined by a physical control format indicator channel (PCFICH).
  • PCFICH physical control format indicator channel
  • the number of symbols used for the CORESET may be defined by the RRC message (and/or PBCH/SIB1).
  • the frequency domain of the CORESET may be defined by the RRC message (and/or PBCH/SIB1) in a unit of RB.
  • the base station may transmit information on the CORESET to the UE.
  • information on the CORESET configuration may be transmitted for each CORESET.
  • at least one of a time duration of the corresponding CORESET e.g., 1/2/3 symbol
  • frequency domain resources e.g., RB set
  • REG-to-CCE mapping type e.g., whether interleaving is applied or not
  • precoding granularity e.g., a REG bundling size (when the REG-to-CCE mapping type is interleaving), an interleaver size (when the REG-to-CCE mapping type is interleaving) and a DMRS configuration (e.g., scrambling ID)
  • a time duration of the corresponding CORESET e.g., 1/2/3 symbol
  • frequency domain resources e.g., RB set
  • REG-to-CCE mapping type e.g., whether interleaving is applied or not
  • precoding granularity e
  • bundling of two or six REGs may be performed. Bundling of two or six REGs may be performed on the two symbols CORESET, and time first mapping may be applied. Bundling of three or six REGs may be performed on the three symbols CORESET, and a time first mapping may be applied.
  • REG bundling is performed, the UE may assume the same precoding for the corresponding bundling unit.
  • the search space for the PDCCH is divided into CSS and USS.
  • the search space may be configured in CORESET.
  • one search space may be defined in one CORESET.
  • CORESET for CSS and CORESET for USS may be configured, respectively.
  • a plurality of search spaces may be defined in one CORESET. That is, CSS and USS may be configured in the same CORESET.
  • CSS means CORESET in which CSS is configured
  • USS means CORESET in which USS is configured. Since the USS may be indicated by the RRC message, an RRC connection may be required for the UE to decode the USS.
  • the USS may include control information for PDSCH decoding assigned to the UE.
  • CSS should also be defined.
  • a PDCCH for decoding a PDSCH that conveys SIB1 is configured or when a PDCCH for receiving MSG 2/4 is configured in a random access procedure.
  • the PDCCH may be scrambled by a radio network temporary identifier (RNTI) for a specific purpose.
  • RNTI radio network temporary identifier
  • a resource allocation in NR is described.
  • a BWP (or carrier BWP) is a set of consecutive PRBs, and may be represented by a consecutive subsets of common RBs (CRBs). Each RB in the CRB may be represented by CRB1, CRB2, etc., beginning with CRB0.
  • FIG. 13 shows an example of a frequency allocation scheme to which technical features of the present disclosure can be applied.
  • multiple BWPs may be defined in the CRB grid.
  • a reference point of the CRB grid (which may be referred to as a common reference point, a starting point, etc.) is referred to as so-called "point A" in NR.
  • the point A is indicated by the RMSI (i.e., SIB1).
  • SIB1 the frequency offset between the frequency band in which the SS/PBCH block is transmitted and the point A may be indicated through the RMSI.
  • the point A corresponds to the center frequency of the CRB0.
  • the point A may be a point at which the variable "k” indicating the frequency band of the RE is set to zero in NR.
  • the multiple BWPs shown in FIG. 13 is configured to one cell (e.g., primary cell (PCell)).
  • a plurality of BWPs may be configured for each cell individually or commonly.
  • each BWP may be defined by a size and starting point from CRB0.
  • the first BWP i.e., BWP #0
  • BWP #0 may be defined by a starting point through an offset from CRB0
  • a size of the BWP #0 may be determined through the size for BWP #0.
  • a specific number (e.g., up to four) of BWPs may be configured for the UE. Even if a plurality of BWPs are configured, only a specific number (e.g., one) of BWPs may be activated per cell for a given time period. However, when the UE is configured with a supplementary uplink (SUL) carrier, maximum of four BWPs may be additionally configured on the SUL carrier and one BWP may be activated for a given time.
  • the number of configurable BWPs and/or the number of activated BWPs may be configured commonly or individually for UL and DL.
  • the numerology and/or CP for the DL BWP and/or the numerology and/or CP for the UL BWP may be configured to the UE via DL signaling.
  • the UE can receive PDSCH, PDCCH, channel state information (CSI) RS and/or tracking RS (TRS) only on the active DL BWP.
  • the UE can transmit PUSCH and/or physical uplink control channel (PUCCH) only on the active UL BWP.
  • CSI channel state information
  • TRS tracking RS
  • FIG. 14 shows an example of multiple BWPs to which technical features of the present disclosure can be applied.
  • 3 BWPs may be configured.
  • the first BWP may span 40 MHz band, and a subcarrier spacing of 15 kHz may be applied.
  • the second BWP may span 10 MHz band, and a subcarrier spacing of 15 kHz may be applied.
  • the third BWP may span 20 MHz band and a subcarrier spacing of 60 kHz may be applied.
  • the UE may configure at least one BWP among the 3 BWPs as an active BWP, and may perform UL and/or DL data communication via the active BWP.
  • a time resource may be indicated in a manner that indicates a time difference/offset based on a transmission time point of a PDCCH allocating DL or UL resources. For example, the start point of the PDSCH/PUSCH corresponding to the PDCCH and the number of symbols occupied by the PDSCH / PUSCH may be indicated.
  • CA Carrier aggregation
  • PSC primary serving cell
  • PCC primary serving cell
  • SSC secondary serving cell
  • SCC secondary CC
  • the UE is allowed to set its configured maximum output power P CMAX,c for serving cell c.
  • the configured maximum output power P CMAX,c is set within the following bounds in Equation 1.
  • P CMAX _ L,c is defined by Equation 2.
  • P CMAX _ L,c MIN ⁇ P EMAX,c - ⁇ T C,c , (P PowerClass - ⁇ P PowerClass ) - MAX(MPR c + A-MPR c + ⁇ T IB,c + ⁇ T C,c + ⁇ T ProSe , P-MPR c ) ⁇
  • P CMAX _ H,c is defined by Equation 3.
  • P CMAX _ H,c MIN ⁇ P EMAX,c , P PowerClass - ⁇ P PowerClass ⁇
  • Equations 2 and 3 the parameters are defined as follows.
  • - P EMAX,c is the value given by information element (IE) P-Max for serving cell c;
  • P PowerClass is the maximum UE power specified without taking into account the tolerance
  • MPR c is a maximum power reduction (MPR) for serving cell c;
  • A- A-MPR c is an additional maximum power reduction (A-MPR) for serving cell c.
  • Additional adjacent channel leakage ratio (ACLR) and spectrum emission requirements can be signaled by the network to indicate that the UE shall also meet additional requirements in a specific deployment scenario. To meet these additional requirements, A-MPR is allowed for the output power. Unless stated otherwise, an A-MPR of 0 dB shall be used.
  • ProSe proximity-based services
  • ⁇ P PowerClass P PowerClass - P PowerClass _Default dB
  • P-MPR c is the allowed maximum output power reduction for:
  • the UE shall apply P-MPR c for serving cell c only for the above cases.
  • P-MPR shall be 0 dB.
  • P-MPR c was introduced in the P CMAX,c equation such that the UE can report to the eNB the available maximum output transmit power. This information can be used by the eNB for scheduling decisions. P-MPR c may impact the maximum uplink performance for the selected UL transmission path.
  • T REF and T eval are specified in Table 5 below for different TTI patterns.
  • the P CMAX _ L,c for serving cell c is evaluated perT eval and given by the minimum value taken over the transmission(s) within the T eval ; the minimum P CMAX_ L,c over the one or more T eval is then applied for the entire T REF .
  • P PowerClass shall not be exceeded by the UE during any period of time.
  • TTI pattern T REF T eval T eval with frequency hopping Subframe 1 subframe 1 slot 1 slot Subslot 2 OS 2 OS Min(T no _hopping , 2OS) Slot 7 OS 7 OS Min(T no _hopping , 7OS)
  • the UE is allowed to set its configured maximum output power P CMAX,f,c for carrier f of serving cell c in each slot.
  • the configured maximum output power P CMAX,f,c is set within the following bounds in Equation 4.
  • P CMAX _ L,f,c is defined by Equation 5.
  • P CMAX _ L,f,c MIN ⁇ P EMAX,c - T C,c , (P PowerClass - ⁇ P PowerClass ) - MAX(MPR c + A-MPR c + ⁇ T IB,c + T C,c + T RxSRS , P-MPR c ) ⁇
  • P CMAX _ H,f,c is defined by Equation 6.
  • P CMAX _ H,f,c MIN ⁇ P EMAX,c , P PowerClass - ⁇ P PowerClass ⁇
  • Equations 5 and 6 the parameters are defined as follows.
  • - P EMAX,c is the value given by IE P-Max for serving cell c;
  • P PowerClass is the maximum UE power without taking into account the tolerance
  • T IB,c 0 dB otherwise
  • - MPR c is a MPR for serving cell c
  • A- A-MPR c is an A-MPR for serving cell c. Additional emission requirements can be signaled by the network with network signaling value indicated by the field additionalSpectrumEmission. To meet these additional requirements, A-MPR is allowed for the maximum output power. Unless stated otherwise, an A-MPR of 0 dB shall be used.
  • T RxSRS is 3 dB and is applied when UE transmits sounding reference signal (SRS) to the antenna port that is designated as Rx port.
  • SRS sounding reference signal
  • T RxSRS is zero.
  • P-MPR c is the allowed maximum output power reduction for:
  • the UE shall apply P-MPR c for serving cell c only for the above cases.
  • P-MPR c shall be 0 dB
  • P-MPR c was introduced in the P CMAX,f,c equation such that the UE can report to the eNB the available maximum output transmit power. This information can be used by the eNB for scheduling decisions. P-MPR c may impact the maximum uplink performance for the selected UL transmission path.
  • the P CMAX _ L,f,c for carrier f of serving cell c is evaluated each slot.
  • E-UTRA-NR DC E-UTRA-NR DC
  • NR-DC NR-NR DC
  • CG cell group
  • processing time capability #1 for one CG and processing time capability #2 for the other CG
  • NR-NR CA NR-NR CA with different processing time capability in different set of carriers.
  • TTI Short TTI
  • OS Orthogonal symbol * K or 7 OS * K2 processing time for PDSCH to PUCCH, PDCCH to PUSCH
  • K and K2 may be based on UE capability
  • - Power for a channel may not be changed during a channel transmission duration
  • a UE may not be required to perform 'look-ahead' beyond its processing capability.
  • a UE operated in regular LTE may not be required to process/compute power for PUSCH/PUCCH transmission at subframe n based on PDCCH transmission after subframe n-4.
  • 'look-ahead' may be based on the time where control channel starts and/or ends. In other words, the look-ahead capability may be solely based on the processing time capability assumption in each carrier/RAT.
  • FIG. 15 shows an example of a slot structure to which the technical features of the present disclosure can be applied.
  • CC1 has a processing time capability A and CC2 has a processing time capability B. It is assumed that the processing time capability A is slower than the processing time capability B. That is, a slot duration of CC1 may be longer than a slot duration of CC2. In FIG. 15, it is assumed that the slot duration of CC1 is twice as the slot duration of CC2. It is further assumed that the slot boundary of CC1 is not aligned with the slot boundary of CC2. Slot p of CC1 is overlapped with slot q-1, q and q+1 of CC2. Slot p+1 of CC1 is overlapped with slot q+1, q+2 and q+3 of CC2. The concept shown in FIG. 15 may be expanded to multiple carriers with multiple different processing time capabilities. Or, it may be assumed that maximum two processing time capabilities among carriers are only considered.
  • CC1 with slower processing time capability A corresponds to PCell or master cell group (MCG)
  • the power may be shared without having guaranteed power.
  • the power may be used by CC1 up to the configured transmit power.
  • computing A-MPR in CC1 the following options may be considered.
  • - Option B It may be assumed that there is no scheduling in CC2 if scheduling information for CC2 at slot n is not available at slot n-4 for CC1. In this case, the timing slot n-4 for CC1 is perspective of CC1. If the numerology is different from each other between CC1 and CC2, different slot index may be referred, and the first slot overlapping with slot n-4 for CC1 may be the slot of control channel for CC2 timeline to enable look-ahead capability.
  • Some semi-static configuration such as grant-free resources may be considered as known scheduling information regardless of whether actual transmission based on the grant-free resources occurs or not. That is, it may be assumed that transmissions would be occurred or not occurred all the time for the grant-free resources.
  • A-MPR may not take scheduling information of CC2 into account, whereas power sharing may consider CC2's scheduling information (if available).
  • FIG. 16 shows an example of a slot structure to which the technical features of the present disclosure can be applied.
  • CC1 has a processing time capability A and CC2 has a processing time capability B. It is assumed that the processing time capability A is faster than the processing time capability B. That is, a slot duration of CC1 may be shorter than a slot duration of CC2.
  • slot duration of CC2 is twice as the slot duration of CC1. It is further assumed that the slot boundary of CC1 is not aligned with the slot boundary of CC2.
  • Slot q of CC2 is overlapped with slot p-1, p and p+1 of CC1. Slot q+1 of CC2 is overlapped with slot p+1, p+2 and p+3 of CC1.
  • the concept shown in FIG. 16 may be expanded to multiple carriers with multiple different processing time capabilities. Or, it may be assumed that maximum two processing time capabilities among carriers are only considered.
  • CC1 with faster processing time capability A corresponds to PCell or MCG (or, CC2 with slower processing time capability B does not correspond to PCell or MCG)
  • guaranteed power for CC1 may be configured which are not usable by CC2 (or CG with slower processing time capability B).
  • A-MPR computation for CC2 (or CG with slower processing time capability B) considering CC1 (or CG with faster processing time capability A), a UE may compute A-MPR assuming a reference scheduling of CC1 (or CG with faster processing time capability A).
  • the reference scheduling may be configured by the network or the worst case A-MPR (i.e. maximum A-MPR) may be assumed.
  • P CMAX _L For computing P CMAX _L for a set of carriers/CGs e.g., for EN-DC, P CMAX _L may be defined by Equation 7.
  • P CMAX _L min ⁇ P CMAX _L (p, q), P CMAX _L (p, q+1)...P CMAX _L (p, q+n), P CMAX _L (p-1, q1), P CMAX_L (p-1, q1+1)...P CMAX_L (p-1, q1+n) ⁇
  • the UE may select the minimum among the overlapped slots which affect the computation of power during the power computation period.
  • a UE In terms of power computation, it may be assumed that a UE is not expected to reduce and/or increase the power during transmission of a channel.
  • P CMAX _L and/or P CMAX _H it may be considered to take minimum value of P CMAX _L among the overlapped portions of a channel of interest and/or maximum value of P- among the overlapped portions of a channel of interest.
  • A-MPR may be computed based on the assumption that UE with slower processing time does not assume any scheduling (unless it's known already by the earlier scheduling and/or pre-configuration) in carriers/CGs with faster processing time. Then, P CMAX _L in carriers/CGs with faster processing time may take a hit, but partial overlap can be handled by taking the minimum value of P CMAX_L (or maximum value of A-MPR) among the overlapped measurement periods (i.e., the most conservative approach for determining P CMAX _L ).
  • FIG. 17 shows an example of computation of P CMAX _L according to the embodiment of the present disclosure.
  • CC1 has a processing time capability A and CC2 has a processing time capability B. It is assumed that the processing time capability A is slower than the processing time capability B. That is, a slot duration of CC1 may be longer than a slot duration of CC2. In FIG. 17, it is assumed that the slot duration of CC1 is twice as the slot duration of CC2. It is further assumed that the slot boundary of CC1 is not aligned with the slot boundary of CC2. Slot p of CC1 is overlapped with slot q-1, q and q+1 of CC2. Slot p+1 of CC1 is overlapped with slot q+1, q+2 and q+3 of CC2. The concept shown in FIG. 17 may be expanded to multiple carriers with multiple different processing time capabilities. Or, it may be assumed that maximum two processing time capabilities among carriers are only considered.
  • PC MAX _L can be defined as min ⁇ P CMAX _L (p, q1), P CMAX_L (p, q1+1), P CMAX _L (p, q1+2), P CMAX _L (p+1, q), P CMAX _L (p+1, q+1), P CMAX _L (p+1, q+2) ⁇ .
  • PC MAX _L in the power computation period can be defined as the minimum value of P CMAX _L for each of all of overlapped periods (i.e., 1702, 1704, 1706, 1708 1710 and 1712) in the power computation period.
  • FIG. 18 shows an example of a method for computing a lower bound of a configured transmit power (i.e., P CMAX _L ) according to the embodiment of the present disclosure.
  • the wireless device establishes connections with both a first node related to a first CG and a second node related to a second CG.
  • the first node related to the first CG may include eNB in LTE
  • the second noes related to the second CG may include a gNB in 5G NR. That is, the connections with both the first node and the second node may be EN-DC.
  • the first CG may be a MCG
  • the second CG may be a secondary cell group (SCG).
  • step S1810 the wireless device computes a lower bound of a configured transmit power in a power computation period based on a maximum of A-MPRs at each of overlapped time intervals between the first node and the second node.
  • the maximum of A-MPRs at each of overlapped time intervals may correspond to a minimum of lower bounds of the configured transmit power at each of overlapped time intervals.
  • a processing time related to the first CG may be slower than a processing time related to the second CG.
  • the A-MPR at each of overlapped time intervals may be computed based on the processing time related to the first CG.
  • step S1820 the wireless device determines the configured transmit power based on the lower bound of the configured transmit power.
  • step S1830 the wireless device performs transmission based on the configured transmit power.
  • the steps S1800 to S1810 described above can be implemented by one of the wireless device 100x of FIG. 1, the first wireless device 100 of FIG. 2, the wireless device 100 of FIG. 4, or the hand-held device 100 of FIG. 5.
  • the lower bound (i.e., P CMAX _L ) of the configured transmit power can be computed in most conservative way. Therefore, even when EN-DC is configured in which processing times of different CGs are different from each other, partial overlap between different CGs with different processing times can be handled properly.

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Abstract

L'invention concerne un procédé et un appareil servant à prendre en charge une commande de puissance dans un système de communication sans fil, spécifiquement dans une double connectivité (EN-DC) E-UTRA-nouvelle radio (NR). Lorsqu'une double connectivité entre des technologies d'accès radio (RAT) différentes, p. ex. EN-DC, est configurée, un dispositif sans fil calcule une borne inférieure d'une puissance d'émission configurée dans une période de calcul de puissance d'après un maximum de réductions supplémentaires de puissance maximale (A-MPR) à chaque intervalle parmi des intervalles de temps en chevauchement entre le premier nœud et le second nœud, et détermine la puissance d'émission configurée d'après la borne inférieure de la puissance d'émission configurée.
PCT/KR2019/011720 2018-09-12 2019-09-10 Procédé et appareil pour effectuer une commande de puissance dans un système de communication sans fil WO2020055098A1 (fr)

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Citations (2)

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US20170265150A1 (en) * 2013-08-21 2017-09-14 Intel Corporation User equipment and method for enhanced uplink power control
KR20180033591A (ko) * 2015-09-18 2018-04-03 엘지전자 주식회사 상향링크 신호와 prose 신호를 전송하는 방법 및 사용자 장치

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US20170265150A1 (en) * 2013-08-21 2017-09-14 Intel Corporation User equipment and method for enhanced uplink power control
KR20180033591A (ko) * 2015-09-18 2018-04-03 엘지전자 주식회사 상향링크 신호와 prose 신호를 전송하는 방법 및 사용자 장치

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"5G; NR; User Equipment (UE) radio transmission and reception; Part 3: Range 1 and Range 2 Interworking operation with other radios (3GPP TS 38.101-3 version 15.2.0 Release 15", ETSI TS 138 101-3, 25 July 2018 (2018-07-25) *
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