WO2021040100A1 - Procédé et appareil d'élimination d'interférence à l'aide d'un schéma hdr dans un système de communication sans fil utilisant un schéma fdr - Google Patents

Procédé et appareil d'élimination d'interférence à l'aide d'un schéma hdr dans un système de communication sans fil utilisant un schéma fdr Download PDF

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Publication number
WO2021040100A1
WO2021040100A1 PCT/KR2019/011155 KR2019011155W WO2021040100A1 WO 2021040100 A1 WO2021040100 A1 WO 2021040100A1 KR 2019011155 W KR2019011155 W KR 2019011155W WO 2021040100 A1 WO2021040100 A1 WO 2021040100A1
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WIPO (PCT)
Prior art keywords
nack
information
harq ack
pdsch
pusch
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PCT/KR2019/011155
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English (en)
Korean (ko)
Inventor
김현민
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엘지전자 주식회사
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Priority to PCT/KR2019/011155 priority Critical patent/WO2021040100A1/fr
Publication of WO2021040100A1 publication Critical patent/WO2021040100A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and apparatus for canceling interference using an FDR scheme and an HDR scheme.
  • Full-duplex communication is the capacity of the system compared to the conventional half-duplex communication, which divides time resources or frequency resources to be orthogonal by performing transmission and reception at one node at the same time. It is a technique that can theoretically improve 2 times.
  • the terminal When using the full-duplex communication technology, since the terminal performs transmission/reception with the same time and frequency resource, not only the desired signal but also the signal transmitted by the terminal is simultaneously received. At this time, since the signal transmitted by itself is received by its own receiving antenna with little attenuation, it is received with a much greater power than the desired signal and can act as interference with respect to the desired signal. This is called intra-device self-interference.
  • the interference problem is solved by controlling the power of the uplink signal and/or the downlink signal.
  • FDR full duplex radio
  • the present disclosure provides a method and apparatus for canceling interference using an HDR scheme in a wireless communication system using an FDR scheme.
  • a method of transmitting information by a base station includes: communicating with a user equipment (UE) in a full duplex radio (FDR) mode (S1910); obtaining information on a first hybrid automatic repeat request acknowledgment/negative acknowledgment (HARQ ACK/NACK) indicating negative acknowledgment (NACK) (S1920); Obtaining information on the second HARQ ACK/NACK indicating NACK (S1920); And information indicating switching from the FDR mode to a half duplex radio (HDR) mode based on the information on the first HARQ ACK/NACK and the information on the second HARQ ACK/NACK. Transmitting to the UE (S1930); And communicating with the UE in the HDR mode (S1940).
  • FDR full duplex radio
  • the information on the first HARQ ACK/NACK indicates NACK of a physical downlink shared channel (PDSCH), and the second Information on HARQ ACK/NACK may be transmitted to the UE based on indicating NACK of a physical uplink shared channel (PUSCH).
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • the information indicating switching from the FDR mode to the HDR mode indicates that the information on the first HARQ ACK/NACK indicates that NACK is generated due to self-interference (SI), and the second HARQ Information on ACK/NACK may be transmitted to the UE based on indicating that NACK has occurred due to a reason other than self-interference.
  • SI self-interference
  • the information indicating switching from the FDR mode to the HDR mode is, the information on the first HARQ ACK/NACK indicates a NACK of a first physical downlink shared channel (PDSCH), and the Information on the second HARQ ACK/NACK may be transmitted to the UE further based on indicating the NACK of the second PDSCH.
  • PDSCH physical downlink shared channel
  • the first PDSCH and the second PDSCH may be transmitted within a predetermined time interval.
  • PDS physical uplink shared channel
  • the first PUSCH and the second PUSCH may be received within a predetermined time interval.
  • a method of transmitting information includes: obtaining information on a third HARQ ACK/NACK indicating NACK for a first physical downlink shared channel (PDSCH); Obtaining information on a fourth HARQ ACK/NACK indicating NACK for a second PDSCH; And controlling power of the PDSCH based on information on the third HARQ ACK/NACK and information on the fourth HARQ ACK/NACK, information on the third HARQ ACK/NACK, and the fourth HARQ.
  • PDSCH physical downlink shared channel
  • All information on ACK/NACK indicates that NACK for the first PDSCH and NACK for the second PDSCH are both generated due to self-interference (SI), or in the third HARQ ACK/NACK
  • SI self-interference
  • Both of the information on the fourth HARQ ACK/NACK and the information on the fourth HARQ ACK/NACK indicate that both NACK for the first PDSCH and NACK for the second PDSCH occurred due to a reason other than self-interference; It may further include.
  • a method of transmitting information includes: obtaining information on a third HARQ ACK/NACK indicating NACK for a first physical uplink shared channel (PUSCH); Obtaining information on a fourth HARQ ACK/NACK indicating NACK for a second PUSCH; And controlling power of the PUSCH based on the information on the third HARQ ACK/NACK and the information on the fourth HARQ ACK/NACK, the information on the third HARQ ACK/NACK, and the fourth HARQ.
  • PUSCH physical uplink shared channel
  • All information on ACK/NACK indicates that NACK for the first PUSCH and NACK for the second PUSCH are both generated due to self-interference (SI), or the third HARQ ACK/NACK
  • SI self-interference
  • Both the information on the fourth HARQ ACK/NACK and the information on the fourth HARQ ACK/NACK indicate that both the NACK for the first PUSCH and the NACK for the second PUSCH occurred due to a reason other than self-interference; I can.
  • interference can be eliminated by using an HDR scheme in a wireless communication system using an FDR scheme.
  • FIG. 1A illustrates a communication system applied to the present invention.
  • FIG. 1B illustrates a wireless device applicable to the present invention.
  • 1C shows another example of a wireless device applied to the present invention.
  • FIG. 2 is a diagram showing an example of a frame structure in NR.
  • 3 shows an example of a resource grid in NR.
  • FIG. 4 shows a conceptual diagram of a terminal and a base station supporting FDR.
  • FIG. 5 is an exemplary diagram for explaining intra device self-interference during various FDR interference.
  • FIG. 6 illustrates a conceptual diagram of a transmit/receive link and self-interference (SI) in an FDR communication situation.
  • SI self-interference
  • FIG. 7 is a diagram illustrating a location where three interference techniques are applied in an RF transmitting/receiving end (or RF front end) of a device.
  • FIG. 8 is a schematic block diagram of a device for self-interference cancellation (Self-IC) in a communication device proposed in a communication system environment using OFDM based on FIG. 7.
  • Self-IC self-interference cancellation
  • FIG. 9 is an exemplary diagram illustrating a basic procedure of an incremental redundancy hybrid automatic repeat request (IR-HARQ) for an uplink signal based on NACK signaling from a base station (eNB, gNB, etc.).
  • IR-HARQ incremental redundancy hybrid automatic repeat request
  • FIG. 10 is an exemplary diagram illustrating a basic procedure of an incremental redundancy hybrid automatic repeat request (IR-HARQ) for a downlink signal based on NACK signaling from a UE.
  • IR-HARQ incremental redundancy hybrid automatic repeat request
  • 11 is an exemplary diagram for explaining the structure of a circular buffer for rate matching.
  • FIG. 12 is a flowchart illustrating a procedure for describing self-interference cancellation when using an FDR scheme.
  • FIG. 13 is an exemplary diagram for explaining a problem that occurs when self-interference cancellation according to the present disclosure is successful and a reception signal is successfully detected (Case 1 in Table 5).
  • FIG. 14 is an exemplary diagram for explaining a problem that occurs when self-interference cancellation according to the present disclosure is successful, but reception signal detection fails (Case 2 in Table 5).
  • FIG. 15 is an exemplary diagram for explaining a problem that occurs when detection of a received signal fails (Case 3 of Table 5) due to a failure in self-interference cancellation according to the present disclosure.
  • 16 is an exemplary diagram illustrating a method of switching to HDR for processing interference in an FDR environment according to the present disclosure.
  • 17 is an exemplary diagram for explaining switching of an HDR mode according to an aspect of the present disclosure.
  • FIG. 18 is an exemplary diagram for explaining switching of an HDR mode according to another aspect of the present disclosure.
  • 19 is an exemplary diagram illustrating a method of transmitting information for switching from an FDR mode to an HDR mode by a base station according to the present disclosure.
  • the terminal collectively refers to a mobile or fixed user end device such as a user equipment (UE), a mobile station (MS), and an advanced mobile station (AMS).
  • UE user equipment
  • MS mobile station
  • AMS advanced mobile station
  • the base station collectively refers to an arbitrary node of a network end communicating with a terminal, such as Node B, eNode B, Base Station, and Access Point (AP).
  • a terminal or user equipment may receive information from a base station through a downlink, and the terminal may also transmit information through an uplink.
  • Information transmitted or received by the terminal includes data and various control information, and various physical channels exist according to the type and purpose of information transmitted or received by the terminal.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with a radio technology such as Global System for Mobile communications (GSM)/General Packet Radio Service (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • FIG. 1A illustrates a communication system applied to the present invention.
  • a communication system 1 applied to the present invention includes a wireless device, a base station, and a network.
  • the wireless device refers to a device that performs communication using a wireless access technology (eg, 5G NR (New RAT), LTE (Long Term Evolution)), and may be referred to as a communication/wireless/5G device.
  • wireless devices include robots 100a, vehicles 100b-1 and 100b-2, eXtended Reality (XR) devices 100c, hand-held devices 100d, and home appliances 100e. ), an Internet of Thing (IoT) device 100f, and an AI device/server 400.
  • the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing inter-vehicle communication, and the like.
  • the vehicle may include an Unmanned Aerial Vehicle (UAV) (eg, a drone).
  • UAV Unmanned Aerial Vehicle
  • XR devices include Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) devices. It can be implemented in the form of a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, and the like.
  • Portable devices may include smart phones, smart pads, wearable devices (eg, smart watches, smart glasses), computers (eg, notebook computers, etc.).
  • Home appliances may include TVs, refrigerators, washing machines, and the like.
  • IoT devices may include sensors, smart meters, and the like.
  • the base station and the network may be implemented as a wireless device, and the specific wireless device 200a may operate as a base station/network node to other
  • the wireless devices 100a to 100f may be connected to the network 300 through the base station 200.
  • AI Artificial Intelligence
  • the network 300 may be configured using a 3G network, a 4G (eg, LTE) network, or a 5G (eg, NR) network.
  • the wireless devices 100a to 100f may communicate with each other through the base station 200/network 300, but may communicate directly (e.g. sidelink communication) without passing through the base station/network.
  • the vehicles 100b-1 and 100b-2 may perform direct communication (e.g.
  • V2V Vehicle to Vehicle
  • V2X Vehicle to Everything
  • the IoT device eg, sensor
  • the IoT device may directly communicate with other IoT devices (eg, sensors) or other wireless devices 100a to 100f.
  • Wireless communication/connections 150a, 150b, and 150c may be established between the wireless devices 100a to 100f/base station 200, and the base station 200/base station 200.
  • wireless communication/connection includes various wireless access such as uplink/downlink communication 150a and sidelink communication 150b (or D2D communication), base station communication 150c (eg relay, Integrated Access Backhaul). This can be achieved through technology (eg 5G NR)
  • the wireless communication/connection 150a, 150b, 150c can transmit/receive radio signals to each other.
  • the wireless communication/connection 150a, 150b, 150c can transmit/receive signals through various physical channels.
  • At least some of a process of setting various configuration information various signal processing processes (eg, channel encoding/decoding, modulation/demodulation, resource mapping/demapping, etc.), resource allocation process, and the like may be performed.
  • various signal processing processes eg, channel encoding/decoding, modulation/demodulation, resource mapping/demapping, etc.
  • resource allocation process e.g., resource allocation process, and the like.
  • FIG. 1B illustrates a wireless device applicable to the present invention.
  • the first wireless device 100 and the second wireless device 200 may transmit and receive wireless signals through various wireless access technologies (eg, LTE and NR).
  • ⁇ the first wireless device 100, the second wireless device 200 ⁇ is the ⁇ wireless device 100x, the base station 200 ⁇ and/or ⁇ wireless device 100x, wireless device 100x) of FIG. 1A ⁇ Can be matched.
  • the first wireless device 100 includes one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and/or one or more antennas 108.
  • the processor 102 controls the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein.
  • the processor 102 may process information in the memory 104 to generate first information/signal, and then transmit a radio signal including the first information/signal through the transceiver 106.
  • the processor 102 may store information obtained from signal processing of the second information/signal in the memory 104 after receiving a radio signal including the second information/signal through the transceiver 106.
  • the memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may perform some or all of the processes controlled by the processor 102, or instructions for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flow charts disclosed herein. It is possible to store software code including:
  • the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement a wireless communication technology (eg, LTE, NR).
  • the transceiver 106 may be coupled with the processor 102 and may transmit and/or receive radio signals through one or more antennas 108.
  • Transceiver 106 may include a transmitter and/or a receiver.
  • the transceiver 106 may be mixed with an RF (Radio Frequency) unit.
  • the wireless device may mean a communication modem/circuit/chip.
  • the second wireless device 200 includes one or more processors 202 and one or more memories 204, and may further include one or more transceivers 206 and/or one or more antennas 208.
  • the processor 202 controls the memory 204 and/or the transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein.
  • the processor 202 may process information in the memory 204 to generate third information/signal, and then transmit a wireless signal including the third information/signal through the transceiver 206.
  • the processor 202 may receive the radio 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 connected to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may perform some or all of the processes controlled by the processor 202, or instructions for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flow charts disclosed in this document. It is possible to store software code including:
  • the processor 202 and the memory 204 may be part of a communication modem/circuit/chip designed to implement a wireless communication technology (eg, LTE, NR).
  • the transceiver 206 may be connected to the processor 202 and may transmit and/or receive radio signals through one or more antennas 208.
  • the transceiver 206 may include a transmitter and/or a receiver.
  • the transceiver 206 may be used interchangeably with an RF unit.
  • the 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 and 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP).
  • One or more processors 102, 202 may be configured to generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the description, functions, procedures, proposals, methods, and/or operational flow charts disclosed in this document. Can be generated.
  • PDUs Protocol Data Units
  • SDUs Service Data Units
  • One or more processors 102, 202 may generate messages, control information, data, or information according to the description, function, procedure, suggestion, method, and/or operational flow chart disclosed herein. At least one processor (102, 202) generates a signal (e.g., a baseband signal) containing PDU, SDU, message, control information, data or information in accordance with the functions, procedures, proposals and/or methods disclosed herein. , Can be provided to one or more transceivers (106, 206).
  • a signal e.g., a baseband signal
  • One or more processors 102, 202 may receive signals (e.g., baseband signals) from one or more transceivers 106, 206, and the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed herein PDUs, SDUs, messages, control information, data, or information may be obtained according to the parameters.
  • signals e.g., baseband signals
  • One or more of the processors 102 and 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer.
  • One or more of the processors 102 and 202 may be implemented by hardware, firmware, software, 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 description, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this document may be implemented using firmware or software, and firmware or software may be implemented to include modules, procedures, functions, and the like.
  • the description, functions, procedures, proposals, methods and/or operational flow charts disclosed in this document are configured to perform firmware or software included in one or more processors 102, 202, or stored in one or more memories 104, 204, and It may be driven by the above processors 102 and 202.
  • the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions, and/or sets of instructions.
  • One or more memories 104, 204 may be connected to one or more processors 102, 202, and may store various types of data, signals, messages, information, programs, codes, instructions and/or instructions.
  • One or more of the memories 104 and 204 may be composed of ROM, RAM, EPROM, flash memory, hard drive, registers, cache memory, computer readable storage media, and/or combinations thereof.
  • One or more memories 104 and 204 may be located inside and/or outside of one or more processors 102 and 202.
  • one or more memories 104, 204 may be connected to one or more processors 102, 202 through various technologies such as wired or wireless connection.
  • One or more transceivers 106 and 206 may transmit user data, control information, radio signals/channels, and the like mentioned in the methods and/or operation flow charts of this document to one or more other devices.
  • One or more transceivers (106, 206) may receive user data, control information, radio signals/channels, etc., mentioned in the description, functions, procedures, proposals, methods and/or operational flowcharts disclosed in this document from one or more other devices. have.
  • one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and may transmit and receive wireless signals.
  • one or more processors 102, 202 may control one or more transceivers 106, 206 to transmit user data, control information, or radio signals 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, or radio signals from one or more other devices.
  • one or more transceivers (106, 206) may be connected to one or more antennas (108, 208), one or more transceivers (106, 206) through the one or more antennas (108, 208), the description and functions disclosed in this document.
  • 1C shows another example of a wireless device applied to the present invention.
  • the wireless device may be implemented in various forms according to use-examples/services (see FIG. 1A).
  • the control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140 and controls all operations of the wireless device. For example, the control unit 120 may control the electrical/mechanical operation of the wireless device based on the program/code/command/information stored in the memory unit 130. In addition, the control unit 120 transmits the information stored in the memory unit 130 to an external (eg, other communication device) through the communication unit 110 through a wireless/wired interface, or externally through the communication unit 110 (eg, Information received through a wireless/wired interface from another communication device) may be stored in the memory unit 130.
  • an external eg, other communication device
  • the additional element 140 may be configured in various ways depending on the type of wireless device.
  • the additional element 140 may include at least one of a power unit/battery, an I/O unit, a driving unit, and a computing unit.
  • wireless devices include robots (FIGS. 1A, 100A), vehicles (FIGS. 1A, 100b-1, 100b-2), XR devices (FIGS. 1A, 100C), portable devices (FIGS. 1A, 100D), and home appliances. (FIGS. 1A, 100E), IoT devices (FIGS.
  • the wireless device can be used in a mobile or fixed place depending on the use-example/service.
  • control unit 120 may be composed of a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphic processing processor, and a memory control processor.
  • memory unit 130 includes random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory. volatile memory) and/or a combination thereof.
  • the memory may store instructions for performing operations by the at least one processor.
  • FIG. 2 is a diagram showing an example of a frame structure in NR.
  • wireless transmission As a general representation of wireless transmission, as a wireless device, for wireless transmission between a base station and a wireless terminal, downlink transmission is used for transmission from the base station to the wireless terminal, and uplink transmission is performed for transmission from the wireless terminal to the base station.
  • a method of classifying radio resources between such downlink transmission and uplink transmission may be defined as'duplex'.
  • FDD frequency division duplex
  • TDD time division duplex
  • the NR system can support multiple neurology.
  • the neurology may be defined by subcarrier spacing and cyclic prefix (CP) overhead.
  • CP cyclic prefix
  • the spacing of the plurality of subcarriers can be derived by scaling the basic subcarrier spacing by an integer N (or ⁇ ).
  • N integer
  • the neurology to be used can be selected independently of the frequency band of the cell.
  • various frame structures according to a number of neurology may be supported.
  • OFDM orthogonal frequency division multiplexing
  • NR supports a number of newer rollers (eg, subcarrier spacing) to support various 5G services. For example, if the subcarrier spacing is 15 kHz, a wide area in traditional cellular bands is supported, and if the subcarrier spacing is 30 kHz/60 kHz, dense-urban, lower latency latency) and a wider carrier bandwidth, and when the subcarrier spacing is 60 kHz or higher, a bandwidth greater than 24.25 GHz is supported to overcome phase noise.
  • subcarrier spacing is 15 kHz
  • the subcarrier spacing is 30 kHz/60 kHz, dense-urban, lower latency latency
  • a bandwidth greater than 24.25 GHz is supported to overcome phase noise.
  • T c 1/( ⁇ f max * N f ), which is a basic time unit for NR.
  • ⁇ f max 480 * 10 3 Hz
  • N f 4096, which is a value related to the size of a fast Fourier transform (FFT) or an inverse fast Fourier transform (IFFT).
  • FFT fast Fourier transform
  • IFFT inverse fast Fourier transform
  • slots are numbered n ⁇ s ⁇ ⁇ 0, ... ,N slot, ⁇ subframe -1 ⁇ in ascending order within a subframe, and within a radio frame Is numbered n ⁇ s,f ⁇ ⁇ 0, ...
  • N slot ⁇ frame -1 ⁇ in ascending order.
  • One slot is composed of N ⁇ symb consecutive OFDM symbols, and N ⁇ symb depends on a cyclic prefix (CP).
  • the start of the slot n ⁇ s in the subframe is temporally aligned with the start of the OFDM symbol n ⁇ s * N ⁇ symb in the same subframe.
  • Table 3 shows the number of OFDM symbols per slot (N slot symb ), the number of slots per frame (N frame, ⁇ slot ), and the number of slots per subframe (N subframe, ⁇ slot ) in a general CP.
  • one subframe may include 4 slots.
  • mini-slot may contain 2, 4 or 7 symbols or may contain more or fewer symbols.
  • the antenna port is defined so that a channel through which a symbol on an antenna port is carried can be inferred from a channel through which another symbol on the same antenna port is carried.
  • the two antenna ports are QC/QCL (quasi co-located). Or, it can be said that it is in a quasi co-location) relationship.
  • the wide range characteristics are delay spread, Doppler spread, frequency shift, average received power, received timing, average delay, It contains one or more of the spatial (reception, Rx) parameters.
  • the spatial Rx parameter refers to a spatial (receiving) channel characteristic parameter such as an angle of arrival.
  • 3 shows an example of a resource grid in NR.
  • N size, ⁇ grid is from BS. It is indicated by RRC signaling.
  • the N size, ⁇ grid may vary between uplink and downlink as well as subcarrier spacing ⁇ .
  • Each element of the resource grid for subcarrier spacing ⁇ and antenna port p is referred to as a resource element, and is uniquely identified by an index pair (k , l ), where k is in the frequency domain.
  • Resource elements ( k , l ) for subcarrier spacing ⁇ and antenna port p correspond to physical resources and complex values a (p, ⁇ ) k,l .
  • the UE may not be able to support a wide bandwidth to be supported in the NR system at once, the UE may be configured to operate in part of the frequency bandwidth of the cell (hereinafter, a bandwidth part (BWP)). .
  • BWP bandwidth part
  • the resource blocks of the NR system include physical resource blocks defined within a bandwidth part and common resource blocks numbered from 0 to an upward direction in the frequency domain with respect to the subcarrier interval setting ⁇ .
  • Point A is obtained as follows.
  • absoluteFrequencyPointA represents the frequency-position of point A expressed as in the absolute radio-frequency channel number (ARFCN).
  • the center of the subcarrier 0 of the common resource block 0 for the subcarrier spacing setting ⁇ coincides with the point A serving as a reference point for the resource grid (coincide).
  • the relationship between the common resource block number n ⁇ CRB and the resource element (k, l) for the subcarrier spacing ⁇ is given by the following equation.
  • Physical resource blocks are numbered from 0 to N size BWP, i -1 within a bandwidth part (BWP), where i is the number of the BWP.
  • BWP bandwidth part
  • Equation 2 The relationship between the physical resource block n PRB and the common resource block n CRB in BWP i is given by Equation 2 below.
  • N start BWP,i is a common resource block in which the BWP starts relative to the common resource block 0.
  • the present invention is an intermediate step in the realistic evolution direction of a full-duplex radio (FDR) technology in which a single wireless device simultaneously transmits and receives on a single frequency transmission band, when UL and DL bands are simultaneously allocated.
  • FDR full-duplex radio
  • FIG. 4 shows a conceptual diagram of a terminal and a base station supporting FDR.
  • interference elements in an FDR environment will be described with reference to FIG. 4.
  • the FDR transmission/reception system capable of simultaneously transmitting and receiving uplink and downlink signals on the same frequency band can increase spectral efficiency up to two times compared to conventional systems that transmit and receive uplink and downlink signals by dividing a frequency or time. For this reason, it is in the spotlight as one of the core technologies of the next-generation 5G mobile communication system.
  • Full-duplex communication is the capacity of the system compared to the conventional half-duplex communication, which divides time resources or frequency resources to be orthogonal by performing transmission and reception at one node at the same time. It is a technique that can theoretically improve 2 times.
  • FDR using a single frequency transmission band can be defined as a transmission resource setting method in which transmission and reception are simultaneously performed through a single frequency transmission band from the viewpoint of an arbitrary wireless device.
  • a total of three types of interference may exist as follows.
  • Intra-device self-interference Since transmission/reception is performed with the same time and frequency resource, not only a desired signal but also a signal transmitted by itself is simultaneously received. In this case, since the signal transmitted by itself is received by its own receiving antenna with little attenuation, it means that it is received with a much greater power than the desired signal and acts as interference.
  • UE to UE inter-link interference This means that an uplink signal transmitted by a UE is received by a UE located adjacent to it and acts as interference.
  • BS to BS inter-link interference It means that a signal transmitted between base stations or between heterogeneous base stations (Picocell, femtocell, relay node) in HetNet situation is received by the receiving antenna of another base station and acts as interference.
  • D2D device-to-device direct communication
  • FIG. 5 is an exemplary diagram for explaining intra device self-interference during various FDR interference.
  • the UE may receive a downlink signal from a base station and transmit an uplink signal to the base station.
  • a UE operating with an FDR scheme may receive an uplink signal transmitted by itself to the base station and may be affected by self-interference.
  • the FDR performs transmission and reception with the same time and frequency resources, not only the desired signal but also the signal transmitted by itself is simultaneously received.At this time, since the transmitted signal has almost no attenuation, it is more than the desired signal. It is received with very large power and can cause interference. Such interference may occur in a system using an FDR scheme, and may cause deterioration of the system. The above-described self-interference problem may occur in the operation of the FDR system.
  • FIG. 6 illustrates a conceptual diagram of a transmit/receive link and self-interference (SI) in an FDR communication situation.
  • SI self-interference
  • SI self-interference
  • direct interference in which the signal transmitted from the transmitting antenna directly enters its receiving antenna without path attenuation, and reflected interference reflected by the surrounding terrain. It can be, and its magnitude is inevitably larger than the desired signal due to the difference in physical distance. Due to such an extremely large intensity of interference, effective removal of magnetic interference is required to drive the FDR system.
  • FIG. 7 is a diagram illustrating a location where three interference techniques are applied in an RF transmitting/receiving end (or RF front end) of a device.
  • the self-interference removal technique that should be executed first is the antenna self-interference removal technique.
  • SI removal is performed at the antenna end.
  • an object that can block signals between the transmitting and receiving antennas to physically block the transmission of SI signals, or by using multiple antennas to artificially adjust the distance between the antennas, or inverting the phase of a specific transmitted signal The SI signal can be partially removed by giving.
  • a part of the SI signal may be removed by using a multi-polarized antenna or a directional antenna.
  • Analog Self-IC This is a technique that removes interference from the analog stage before the received signal passes through the ADC (Analog-to-Digital Convertor). It is a technique that removes the SI signal by using the duplicated analog signal. This can be done in the RF region or the IF region.
  • a method of removing the SI signal is described in detail as follows. First, the transmitted analog signal is delayed in time, and then the size and phase are adjusted to create a duplicate signal of the actually received SI signal and subtract it from the signal received by the receiving antenna. However, since processing is performed using an analog signal, additional distortion may occur due to implementation complexity and circuit characteristics, and thus the interference cancellation performance may be greatly changed.
  • Digital Self-IC This is a technique that removes interference after the received signal passes through the ADC, and includes all interference cancellation techniques performed in the baseband domain. In the simplest way, it can be implemented by subtracting from the received digital signal by making a duplicate signal of the SI by using the transmitted digital signal. Alternatively, by performing precoding/postcoding in the baseband using multiple antennas, techniques for preventing a transmission signal from a terminal or base station from being received by a reception antenna can also be classified as Digital Self-IC. However, since Digital Self-IC can be quantized enough to restore information about a desired signal, a digitally modulated signal can be interfered by using one or more of the above techniques to perform Digital Self-IC. A prerequisite is required that the difference in the magnitude of the signal power between the desired signal and the remaining interfering signal after removal of is within the ADC range.
  • FIG. 8 is a schematic block diagram of a device for self-interference cancellation (Self-IC) in a communication device proposed in a communication system environment using OFDM based on FIG. 7.
  • Self-IC self-interference cancellation
  • FIG. 8 is a conceptual diagram of removing a self-interference signal by separating a transmitting antenna and a receiving antenna, a method of configuring an antenna different from that of FIG. 6 may be used when an antenna interference cancellation technique using one antenna is used.
  • Function blocks suitable for a purpose may be added or deleted at the RF transmitter and receiver shown in FIG. 9.
  • the transmission signal is distorted by the nonlinear characteristics of active elements such as the power amplifier (PA) of the transmitting RF chain and the low noise amplifier (LNA) of the receiving RF chain, and the distortion is also transformed by the mixer in the transmitting/receiving RF chain.
  • the transmission signal due to such distortion can be modeled as generating a component corresponding to a high-order term. Among them, an even-order component affects a high-frequency region that is several times the center frequency and around DC, so it can be effectively removed using conventional AC coupling or filtering techniques.
  • the received signal after the ADC in the FDR system is expressed using a Parallel Hammerstein (PH) Model as shown in Equation 1 below.
  • k is an odd number
  • x SI [n] is the data transmitted by itself from the RF transmitting end of the device
  • h SI [n] is the self-interference channel experienced by the data transmitted by the RF transmitting end itself.
  • -channel x D [n] is the data to be received at the RF receiving end of the device
  • h D [n] is the desired channel experienced by the data to be received at the RF receiving end.
  • AWGN Additive White Gaussian Noise
  • the UE After the UE receives the downlink signal, it undergoes a decoding procedure, and if data decoding fails, retransmission based on a hybrid automatic repeat reQuest (HARQ) procedure that transmits a NACK (signal) to the base station through PUCCH or PUSCH You can make a request.
  • HARQ hybrid automatic repeat reQuest
  • FIG. 9 is an exemplary diagram illustrating a basic procedure of an incremental redundancy hybrid automatic repeat request (IR-HARQ) for an uplink signal based on NACK signaling from a base station (eNB, gNB, etc.).
  • IR-HARQ incremental redundancy hybrid automatic repeat request
  • a base station eNB, gNB, etc.
  • NACK is transmitted to the base station through the PDCCH to request retransmission based on the HARQ procedure.
  • the new data indicator (NDI) of the PDCCH may indicate HARQ ACK/NACK of the uplink signal transmitted through the PUSCH.
  • 9 is an exemplary diagram for explaining the above-described procedure.
  • the UE may receive scheduling resource allocation for an uplink signal from the gNB.
  • the UE may transmit a physical uplink shared channel (PUSCH) using the scheduled resource.
  • transmitting the PUSCH may mean transmitting control information and/or data through the PUSCH.
  • the base station may perform decoding on the PUSCH transmitted from the UE.
  • the base station may determine the ACK/NACK of the PUSCH based on the CRC value using OFDM decoder and rate matching. Based on the determined ACK/NACK, downlink control information (DCI) may be set, and the configured DCI may be transmitted to the UE.
  • the DCI parameter associated with HARQ may be a New Data Indicator (NDI) and a HARQ process number (HARQ Process Number, HPN).
  • NDI New Data Indicator
  • HPN HARQ Process Number
  • HARQ NACK DCI
  • FIG. 10 is an exemplary diagram illustrating a basic procedure of an incremental redundancy hybrid automatic repeat request (IR-HARQ) for a downlink signal based on NACK signaling from a UE.
  • IR-HARQ incremental redundancy hybrid automatic repeat request
  • a UE receives a PDSCH including user data from a network NW (eg, a base station).
  • the PDSCH may be scheduled by DCI (format) 1 (DCI (format) 1) of the PDCCH.
  • the subframe in which ACK/NACK is transmitted may vary depending on whether the PDCCH includes DCI (format) 0.
  • the UE transmits ACK/NACK to the PUCCH in the fourth subframe (subframe n+4) after the subframe (subframe n) in which the PDSCH is received. It can be transmitted through the transmission, if not, it can be transmitted through the PUSCH.
  • the base station may determine whether a signal received from the terminal is ACK or NACK, and in the case of NACK, may retransmit the PDSCH in a fourth subframe after the subframe from which the NACK is received.
  • the terminal has no information about the downlink HARQ procedure.
  • the UE obtains information about the DL HARQ procedure through information (Process ID, Redundancy Version (RV) value) included in the DCI (Downlink control format, DCI) (format) in the PDCCH transmitted by the base station. Accordingly, decoding is performed based on the data of the retransmitted PDSCH.
  • the received downlink signal may be decoded.
  • HARQ NACK may be transmitted to the base station through PUCCH or PUSCH.
  • the UE may request retransmission from the base station based on the uplink HARQ procedure.
  • 11 is an exemplary diagram for explaining the structure of a circular buffer for rate matching.
  • the RV value of a signal encoded through an OFDM encoder and rate matching may be changed in the order of 0, 2, 1, and 3 and then transmitted.
  • a part of an existing encoded signal may be reused and retransmitted without creating an additional encoded signal.
  • FIG. 12 is a flowchart illustrating a procedure for describing self-interference cancellation when using an FDR scheme.
  • decoding of a downlink signal may fail due to interference of a downlink channel channel quality or other cell/other UE).
  • decoding may fail due to self-interference cancellation (self IC) performance even if there is no channel quality or interference from other cells/other UEs.
  • self IC self-interference cancellation
  • FIG. 12 a procedure for operating an existing Self-IC in an FDR system will be described.
  • the communication device may receive a signal and perform an antenna/analog self-interference cancellation (Ana/Analog Self-IC) procedure 1220 on the received signal.
  • a digital interference cancellation procedure may be performed on a signal obtained by performing the antenna/analog self-interference cancellation procedure.
  • a signal obtained by performing the antenna/analog self-interference cancellation procedure may have a form as shown in Equation (3).
  • the digital interference cancellation procedure may generate a digital self-interference signal (Digital SI Signal Generation) 1230 and cancel digital self-interference (Digital Self-IC) 1240 based on the generated digital self-interference signal.
  • the signal from which the digital magnetic interference has been removed may be in the form of Equation 4.
  • a signal from which digital self-interference has been removed may be decoded 1250 to obtain information. Decoding a digital signal is also referred to as detection of a digital signal. After detecting the digital signal, the FDR operation may be terminated (1260).
  • the detection performance of the received signal is the estimated self-interference channel ( ) And desired channel ( ) Is greatly affected by the accuracy. That is, if the accuracy of the self-interference channel and the desired channel is high, the detection performance will increase. Therefore, it is possible to determine the success/failure of Self-IC based on the success/failure of detection of the final received signal.
  • Table 6 is a table showing the correlation between the success/failure of detection of the received signal and the success/failure of Self-IC.
  • Case 1 shows a case in which a desired signal is successfully decoded after Digital Self-IC is established.
  • Case 2 is a case where Digital Self-IC succeeds, but the decoding of a desired signal fails.
  • the cause of failure of decoding may include at least one of an error in channel estimation, poor link quality, or interference from other cells/other UEs.
  • Case 3 will be a case in which the received signal cannot be decoded (detected) due to the failure of Self-IC.
  • the Self-IC fails, there may be an error in channel estimation, or interference from other cells/other UEs may exist, but the strength of the self-interference signal is usually stronger than the strength of an external interference signal.
  • the most likely cause of the failure to decode the received signal is the failure of self-interference cancellation.
  • the cause of the failure of Self-IC is not limited to the above criteria. If self-IC is appropriately a criterion for determining failure, it can be adopted as a cause of self-IC failure in the present disclosure.
  • the decoding failure of a received signal can be divided into a decoding failure due to Self-IC and a decoding failure due to environmental factors (eg, environmental interference).
  • environmental factors eg, environmental interference
  • the base station may receive information about the result of the decoding failure (HARQ ACK/NACK) from the UE, but does not receive information about the cause of the decoding failure from the UE.
  • HARQ ACK/NACK information about the result of the decoding failure
  • SI flag information about the cause of the decoding failure
  • the UE may recognize a failure in decoding a downlink signal due to channel quality or interference from another cell/other UE and a failure in decoding according to the performance of self-interference cancellation (Self-IC).
  • the cause of the decoding failure may be transmitted to the base station in the form of a flag.
  • a flag indicating the cause of the decoding failure (SI flag) may be transmitted to the base station through a PUCCH or PUSCH together with HARQ ACK/NACK.
  • the base station receiving the SI flag from the UE can know the cause of the NACK for the PDSCH.
  • the base station may provide an appropriate setting (eg, through DCI or RRC signaling) to the UE.
  • the base station when NACK occurs, the base station can increase the power of the PUSCH when NACK occurs for an uplink signal (eg, PUSCH), and NACK for a downlink signal (eg, PDSCH) occurs. In this case, the power of the PDSCH can be increased.
  • the 5G NR system does not limit the number of retransmissions according to the HARQ procedure. When the above flag is used, the following problems may occur.
  • FIG. 13 is an exemplary diagram for explaining a problem that occurs when self-interference cancellation according to the present disclosure is successful and a reception signal is successfully detected (Case 1 in Table 5).
  • the base station may control the power of the UE through transmit power control (TPC).
  • TPC transmit power control
  • the UE When the uplink and downlink operate at the same time (S1312), when the UE receives the PDSCH from the base station (eNB, gNB, base station), the UE fails to decode the PDSCH received by the SI component (NACK for PDSCH ) (S1316) You can. Meanwhile, the base station may succeed in decoding the PUSCH received from the UE (S1314).
  • the UE may transmit uplink control information including NACK (including UCI, uplink control information, and HARQ ACK/NACK) to the base station through the PUCCH (S1322). Alternatively, the UE may transmit UCI including NACK to the base station through the PUSCH channel.
  • NACK including UCI, uplink control information, and HARQ ACK/NACK
  • the base station may receive a PUSCH including HARQ ACK/NACK from the UE (S1322). The base station can decode the received PUSCH. If the base station succeeds in PUSCH decoding, it may transmit ACK information (eg, NDI) and TPC information to the UE through the PDCCH (S1332). Based on the ACK information and the TPC information, the UE may lower the power of the PUSCH in order to reduce the SI component (S1334). The UE may transmit the PUSCH by lowering the power of the PUSCH based on the TPC information (S1342).
  • ACK information eg, NDI
  • TPC information Transmission Control Protocol
  • the UE may include information on whether PDSCH decoding success/failure (SI flag) together with HARQ ACK/NACK information in the PUSCH and transmit it to the base station (S1342). However, when the power of the PUSCH is lowered, NACK for the PUSCH may occur due to environmental interference (S1344). At this time, it is assumed that the PDSCH transmitted from the base station to the UE is successfully decoded (ACK) (S1346).
  • SI flag PDSCH decoding success/failure
  • ACK acknowledged
  • the base station may transmit a DCI including TPC information and NACK information for the PUSCH (eg, NDI of DCI) to the UE through the PDCCH so as to increase the power of the PUSCH again (S1352).
  • the UE receiving the DCI may increase the PUSCH power (S1354) and transmit the PUSCH to the base station (S1362), and due to the increased PUSCH power, the self-interference (SI) component increases, resulting in a PDSCH decoding failure. (S1366).
  • the base station fails to decode the PUSCH (S1344), and if the PUSCH power is increased (S1354) to succeed in the PUSCH decoding, the self-interference component is large As a result, the decoding of the PDSCH may fail (S1366).
  • the NACK for the PUSCH and the NACK for the PDSCH are repeatedly generated between the UE and the base station, a procedure for the UE to increase and decrease the power of the PUSCH may be repeatedly performed.
  • FIG. 14 is an exemplary diagram for explaining a problem that occurs when self-interference cancellation according to the present disclosure is successful, but reception signal detection fails (Case 2 in Table 5).
  • the base station may control PDSCH power and may control the power of the UE by using transmit power control (TPC).
  • TPC transmit power control
  • the uplink and downlink operate simultaneously (S1412)
  • the UE receives the PDSCH from the base station, the UE cannot decode the received PDSCH due to the SI component, and thus the detection of the received PDSCH fails (NACK Occurs) (S1416).
  • the UE may transmit a NACK for the PDSCH to the base station through PUCCH or PUSCH (S1422).
  • the NACK for the PDSCH may be piggybacked on the PUSCH and transmitted to the base station.
  • the NACK for the PDSCH may further include self-interference flag (SI flag) information.
  • the self-interference flag information may indicate whether the cause of the NACK for the PDSCH is due to self-interference.
  • the error vector magnitude (EVM) is out of the constellation point. It may be determined that the self-interference cancellation has failed based on a high degree of accuracy or 3) having a high similarity to an SI signal, which is a known signal when error correction code decoding is performed. That is, whether the cause of the NACK for the PDSCH is due to self-interference may be determined based on 1), 2), and 3) above.
  • the UE may transmit a flag indicating self-interference cancellation failure together with HARQ ACK/NACK in UCI and transmit it to the base station.
  • the UCI may be transmitted by being piggybacked on the PUSCH.
  • the base station may receive the PUSCH from the UE (S1442) and may decode the received PUSCH. If decoding of the received PUSCH is successful (ACK), HARQ ACK/NACK information piggybacked on the received PUSCH and the self-interference flag information may be obtained.
  • the base station may transmit ACK information (eg, NDI) of PUSCH and a TPC command to the UE through the PDCCH (S1434).
  • the base station may transmit the PDSCH by increasing the power of the PDSCH to be transmitted based on the NACK for the previously transmitted PDSCH (S1432).
  • the UE Since the power of the PDSCH is increased (S1432), the probability that the UE will succeed in decoding the PDSCH will increase. If the UE succeeds in decoding the PDSCH (S1446), the UE may transmit an ACK of the PDSCH to the base station (not shown in the figure). However, when the power of the PDSCH increases, the SI component of the base station increases, so the base station may not be able to decode the PUSCH (S1444). That is, by the NACK for the PUSCH, the base station may lower the power of the PDSCH again in order to reduce self-interference (S1452). Since the power of the PDSCH is lowered, the UE may have a lower probability of succeeding in decoding the PDSCH (S1466). If the UE fails to decode the PDSCH, the UE will repeat the procedures of S1462, S1462, S1466, S1472, S1482, S1484, as in S1412, S1414, S1416, S1422, S1432, S143
  • the base station may control the power of the PDSCH.
  • decoding of the PUSCH may fail due to self-interference in the base station
  • decoding of the PDSCH may fail due to self-interference in the UE. That is, while the PDSCH decoding failure of the UE and the PUSCH decoding failure of the base station occur alternately, operations to increase or decrease the power of the PDSCH occur repeatedly. This can be called a ping pong problem in power control.
  • the number of operations to increase or decrease the power of the PDSCH or PUSCH that occur repeatedly may be referred to as the number of ping fangs of power control.
  • FIG. 15 is an exemplary diagram for explaining a problem that occurs when detection of a received signal fails (Case 3 of Table 5) due to a failure in self-interference cancellation according to the present disclosure.
  • NACK is generated by either a self-interference component or an environmental interference component (S1554).
  • the base station can be difficult to determine whether to increase or decrease the PDSCH power.
  • the base station may communicate with the UE in the FDR mode (S1512).
  • the UE fails to decode the received PDSCH and may transmit the first HARQ ACK/NACK information and the first SI flag information to the base station (S1512).
  • the first HARQ ACK/NACK information may include first SI flag information.
  • the base station may transmit a DCI including a TPC command, which may control power of the UE, to the UE based on the first HARQ ACK/NACK information and the first SI flag information.
  • the TPC command may include information for reducing UE PUSCH power.
  • the UE may transmit the PUSCH to the base station according to the reduced PUSCH power (S1542).
  • the base station may fail PUSCH decoding due to self-interference (S1544).
  • the UE also fails to decode the PDSCH, so that the second HARQ ACK/NACK information and the second SI flag information may be transmitted to the base station (S1552).
  • the second SI flag information may indicate that decoding has failed due to environmental factors.
  • NACK for the PDSCH has occurred due to environmental factors, it is desirable to increase the power of the PDSCH, and since the NACK for the PUSCH has occurred in the base station due to self-interference, it is desirable to decrease the power of the PDSCH.
  • the base station can be difficult to both reduce and increase power.
  • 16 is an exemplary diagram illustrating a method of switching to HDR for processing interference in an FDR environment according to the present disclosure.
  • the self-interference component and general interference component of the UE can always occur in the FDR.
  • the interference problem may be solved by switching from the FDR mode to a half duplex radio (HDR) mode.
  • HDR half duplex radio
  • a flag for converting from FDR to HDR may be defined, and data may be transmitted by temporarily switching from FDR to HDR. After a certain period of time has passed or a certain amount of data has been transmitted, it is possible to switch from HDR to FDR.
  • an explicit conversion flag for switching back from HDR to FDR may be transmitted.
  • the switching flag may be transmitted through DCI, RRC signaling and high layer signaling.
  • a duplex mode may be implicitly defined by DCI operating in FDR mode and DCI operating in HDR mode.
  • DCI operating in FDR mode DCI operating in HDR mode
  • downlink scheduling and uplink scheduling can be delivered through separate DCIs. Therefore, by appropriately transmitting DCI for downlink scheduling and DCI for uplink scheduling, it is possible to operate in the HDR mode or the FDR mode.
  • one DCI since downlink scheduling and uplink scheduling need to be scheduled in one DCI, one DCI may include both downlink scheduling and uplink scheduling.
  • a method of avoiding an interference problem is proposed when the communication environment is temporarily poor.
  • asymmetric data traffic may occur.
  • the ratio of uplink data traffic and downlink data traffic is about 1:9.
  • FDR throughput
  • FDR may exhibit better performance than HDR, but FDR performance may be lower than HDR performance in terms of interference.
  • the conditions for the transition from FDR to HDR can vary. For example, it is possible to switch from the FDR mode to the HDR mode based on the number of ping fangs in power control or the causes of decoding failure. Also, based on a ratio of downlink data traffic and uplink data traffic, it is possible to switch from the FDR mode to the HDR mode.
  • S1612, S1622 and S1632 of FIG. 16 may correspond to S1312, S1322 and S1342 of FIG. 13.
  • S1612, S1622 and S1632 of FIG. 16 may correspond to S1412, S1422 and S1434 of FIG. 14.
  • S1612, S1622 and S1632 of FIG. 16 may correspond to S1512, S1522 and S1532 of FIG. 15.
  • NACK for S1612 S1616 or S1614
  • NACK for S1642 S1644 or S1646
  • FDR to HDR S1654, S1660
  • the condition for switching from FDR to HDR may be determined based on the cause of the decoding failure of NACK, as described above. And it may not be able to solve all the problems of environmental interference.
  • the base station transmits information instructing the UE to switch from the FDR mode to the HDR mode (S1652), and switches from the FDR mode to the HDR mode (S1654), By transmitting information instructing the UE to switch from the HDR mode to the FDR mode (S1672), the base station can communicate with the UE by switching from the HDR mode to the FDR mode (S1660).
  • the S1612, S1622, S1632, S1642, S1652 can operate in FDR mode, and the S1660 and S1672 can operate in HDR mode, except that the uplink control channel and downlink control channel operate similarly to the HDR mode, regardless of the duplex mode. can do.
  • the following four cases may exist for the cause of the decoding failure of the NACK. That is, 1) When NACK occurs due to self-interference, and then NACK occurs continuously due to general interference. 2) When NACK occurs due to normal interference and then NACK occurs due to self-interference. 3) When PUSCH NACK occurs after PDSCH NACK occurs. 4) After PUSCH NACK occurs, there may be a case in which PDSCH NACK occurs. In the above four cases, the interference problem may be solved by switching from the FDR mode to the HDR mode.
  • 17 is an exemplary diagram for explaining switching of an HDR mode according to an aspect of the present disclosure.
  • the base station may receive NACK for PDSCH (feedback for PDSCH) from the UE. Before switching from the FDR mode to the HDR mode, the base station can communicate with the UE in the FDR mode.
  • the base station receives the NACK for the PDSCH (S1710), it may check whether the NACK has continuously occurred (S1720). That is, it can be checked whether PDSCH NACK has occurred before (S1720). If the two generated NACKs are the same NACK (NACK for PDSCH) (Yes in S1720), and the cause of the NACK (whether self-interference cancellation has failed) is the same (Yes in S1732), the power of the PDSCH is controlled.
  • the base station may inform the UE of the duplex mode to be switched to through downlink control information (DCI) (S1652).
  • DCI downlink control information
  • the UE receives an indicator indicating an HDR operation
  • information related to uplink scheduling may be excluded during blind decoding. That is, when the UE receives the HDR operation indicator, it may be assumed that there is no Uplink grant (uplink scheduling information) in the downlink period. Alternatively, even if the uplink grant is decoded, it can be ignored.
  • the FDR mode can be switched to the HDR mode. Yes (S1740).
  • the previously generated NACK includes the immediately preceding NACK and the NACK for initial transmission corresponding to the retransmission, but is applicable if the NACK is within a predetermined time interval. However, it is possible to appropriately select a time period (window size) to be monitored in consideration of computational overload caused by switching between the FDR mode and the HDR mode.
  • the interference can be eliminated by controlling the power of the PDSCH (S1750). For example, if PDSCH NACK has not previously occurred (No in S1720), it may be checked whether PUSCH NACK has previously occurred (S1734). If, after the PUSCH NACK occurs, if the PDSCH NACK occurs (Yes in S1734), the same problem as in FIG. 13 may occur, and thus the FDR mode can be switched to the HDR mode (S1740).
  • FIG. 18 is an exemplary diagram for explaining switching of an HDR mode according to another aspect of the present disclosure.
  • NACK for the PUSCH when a base station receives a PUSCH from a UE and fails to decode the PUSCH, it can be confirmed that NACK for the PUSCH has occurred (S1810).
  • NACK for PUSCH occurs (Yes in S1810), it can be checked whether NACK for PUSCH has occurred in succession (S1820). If the NACK for the successively generated PUSCH is caused by the same cause (eg, NACK due to self-interference or NACK due to general interference) (Yes in S1832), interference can be removed by controlling power.
  • the interference problem can be solved by switching from the FDR mode to the HDR mode. For example, after NACK for PUSCH due to self-interference occurs (Yes in S1810), if NACK for PUSCH due to general interference occurs (Yes in S1820) (No in S1832), it is possible to switch from FDR mode to HDR mode. Yes (S1840). If each of the consecutively generated NACKs is NACK due to general interference (Yes in S1832), power can be controlled (S1850). If the PUSCH NACK occurs after the PDSCH NACK occurs (Yes in S1834), the same problem as in FIG. 13 may occur, so that the FDR mode can be switched to the HDR mode (S1840). The base station may inform the UE of the duplex mode to be switched to through downlink control information (DCI) (S1652).
  • DCI downlink control information
  • 19 is an exemplary diagram illustrating a method of transmitting information for switching from an FDR mode to an HDR mode by a base station according to the present disclosure.
  • a method of transmitting information by a base station in a wireless communication system includes the steps of communicating with a user equipment (UE) in a full duplex radio (FDR) mode (S1910); obtaining information on a first hybrid automatic repeat request acknowledgment/negative acknowledgment (HARQ ACK/NACK) indicating negative acknowledgment (NACK) (S1920); Obtaining information on the second HARQ ACK/NACK indicating NACK (S1920); And information indicating switching from the FDR mode to a half duplex radio (HDR) mode based on the information on the first HARQ ACK/NACK and the information on the second HARQ ACK/NACK. Transmitting to the UE (S1930); And communicating with the UE in the HDR mode (S1940).
  • FDR full duplex radio
  • the information on the first HARQ ACK/NACK indicates NACK of a physical downlink shared channel (PDSCH), and the second Information on HARQ ACK/NACK may be transmitted to the UE based on indicating NACK of a physical uplink shared channel (PUSCH).
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • the information indicating switching from the FDR mode to the HDR mode indicates that the information on the first HARQ ACK/NACK indicates that NACK is generated due to self-interference (SI), and the second HARQ Information on ACK/NACK may be transmitted to the UE based on indicating that NACK has occurred due to a reason other than self-interference.
  • SI self-interference
  • the information indicating switching from the FDR mode to the HDR mode is, the information on the first HARQ ACK/NACK indicates a NACK of a first physical downlink shared channel (PDSCH), and the Information on the second HARQ ACK/NACK may be transmitted to the UE further based on indicating the NACK of the second PDSCH.
  • PDSCH physical downlink shared channel
  • the first PDSCH and the second PDSCH may be transmitted within a predetermined time interval.
  • PDS physical uplink shared channel
  • the first PUSCH and the second PUSCH may be received within a predetermined time interval.
  • a method of transmitting information includes: obtaining information on a third HARQ ACK/NACK indicating NACK for a first physical downlink shared channel (PDSCH); Obtaining information on a fourth HARQ ACK/NACK indicating NACK for a second PDSCH; And controlling power of the PDSCH based on information on the third HARQ ACK/NACK and information on the fourth HARQ ACK/NACK, information on the third HARQ ACK/NACK, and the fourth HARQ.
  • PDSCH physical downlink shared channel
  • All information on ACK/NACK indicates that NACK for the first PDSCH and NACK for the second PDSCH are both generated due to self-interference (SI), or in the third HARQ ACK/NACK
  • SI self-interference
  • Both of the information on the fourth HARQ ACK/NACK and the information on the fourth HARQ ACK/NACK indicate that both NACK for the first PDSCH and NACK for the second PDSCH occurred due to a reason other than self-interference; It may further include.
  • a method of transmitting information includes: obtaining information on a third HARQ ACK/NACK indicating NACK for a first physical uplink shared channel (PUSCH); Obtaining information on a fourth HARQ ACK/NACK indicating NACK for a second PUSCH; And controlling power of the PUSCH based on the information on the third HARQ ACK/NACK and the information on the fourth HARQ ACK/NACK, the information on the third HARQ ACK/NACK, and the fourth HARQ.
  • PUSCH physical uplink shared channel
  • All information on ACK/NACK indicates that NACK for the first PUSCH and NACK for the second PUSCH are both generated due to self-interference (SI), or the third HARQ ACK/NACK
  • SI self-interference
  • Both the information on the fourth HARQ ACK/NACK and the information on the fourth HARQ ACK/NACK indicate that both the NACK for the first PUSCH and the NACK for the second PUSCH occurred due to a reason other than self-interference; I can.

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

Abstract

La présente invention concerne un procédé de transmission d'informations par une station de base dans un système de communication sans fil qui peut comprendre les étapes consistant à : communiquer avec un équipement utilisateur (UE) dans un mode de radio en duplex intégral (FDR) (S1910) ; obtenir des informations sur un premier accusé de réception/accusé de réception négatif de demande de répétition automatique hybride (ACK/NACK HARQ) indiquant un NACK (S1920), et obtenir des informations sur un second ACK/NACK HARQ indiquant un NACK (S1920) ; sur la base des informations sur le premier ACK/NACK HARQ et des informations sur le second ACK/NACK HARQ, transmettre, à l'UE, des informations indiquant de commuter du mode FDR à un mode de radio en semi-duplex (HDR) (S1930) ; et communiquer avec l'UE dans le mode HDR (S1940).
PCT/KR2019/011155 2019-08-30 2019-08-30 Procédé et appareil d'élimination d'interférence à l'aide d'un schéma hdr dans un système de communication sans fil utilisant un schéma fdr WO2021040100A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015053583A1 (fr) * 2013-10-10 2015-04-16 엘지전자 주식회사 Procédé et appareil d'annulation de brouillage entre terminaux dans un système d'accès sans fil prenant en charge un système radio bidirectionnel simultané
KR20160010437A (ko) * 2013-05-22 2016-01-27 엘지전자 주식회사 전 이중 무선 방식을 지원하는 무선 접속 시스템에서 적용되는 전 이중 무선 영역의 구조, 이를 할당하는 방법 및 장치
KR20160023666A (ko) * 2013-06-25 2016-03-03 엘지전자 주식회사 전 이중 무선 방식을 지원하는 무선 접속 시스템에서 자기 간섭 측정 방법 및 장치
WO2017217584A1 (fr) * 2016-06-12 2017-12-21 엘지전자 주식회사 Procédé pour réaliser une procédure harq dans un environnement fonctionnant en mode fdr et appareil associé
US20180302196A1 (en) * 2014-03-06 2018-10-18 Interdigital Patent Holdings, Inc. Full duplex operation in wireless systems

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160010437A (ko) * 2013-05-22 2016-01-27 엘지전자 주식회사 전 이중 무선 방식을 지원하는 무선 접속 시스템에서 적용되는 전 이중 무선 영역의 구조, 이를 할당하는 방법 및 장치
KR20160023666A (ko) * 2013-06-25 2016-03-03 엘지전자 주식회사 전 이중 무선 방식을 지원하는 무선 접속 시스템에서 자기 간섭 측정 방법 및 장치
WO2015053583A1 (fr) * 2013-10-10 2015-04-16 엘지전자 주식회사 Procédé et appareil d'annulation de brouillage entre terminaux dans un système d'accès sans fil prenant en charge un système radio bidirectionnel simultané
US20180302196A1 (en) * 2014-03-06 2018-10-18 Interdigital Patent Holdings, Inc. Full duplex operation in wireless systems
WO2017217584A1 (fr) * 2016-06-12 2017-12-21 엘지전자 주식회사 Procédé pour réaliser une procédure harq dans un environnement fonctionnant en mode fdr et appareil associé

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