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WO2018160015A1 - Procédé et dispositif de transmission de dm-rs dans un système de communication sans fil - Google Patents

Procédé et dispositif de transmission de dm-rs dans un système de communication sans fil Download PDF

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Publication number
WO2018160015A1
WO2018160015A1 PCT/KR2018/002488 KR2018002488W WO2018160015A1 WO 2018160015 A1 WO2018160015 A1 WO 2018160015A1 KR 2018002488 W KR2018002488 W KR 2018002488W WO 2018160015 A1 WO2018160015 A1 WO 2018160015A1
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WO
WIPO (PCT)
Prior art keywords
control channel
tti
downlink control
pattern
terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2018/002488
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English (en)
Korean (ko)
Inventor
여정호
김태형
신철규
김윤선
박성진
오진영
김영범
최승훈
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Filing date
Publication date
Priority claimed from KR1020170036945A external-priority patent/KR102383906B1/ko
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to US16/489,661 priority Critical patent/US11057176B2/en
Priority to EP18761578.6A priority patent/EP3576332B1/fr
Publication of WO2018160015A1 publication Critical patent/WO2018160015A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041—Arrangements at the transmitter end
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • 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
    • H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing

Definitions

  • the present invention relates to a wireless communication system, and relates to a method and apparatus for downlink control and data signal decoding. More specifically, the present invention relates to a method for determining which downlink control and data signals are transmitted to which user.
  • the present invention also relates to a wireless communication system, and more particularly, to a method and apparatus for setting a DMRS for a downlink control channel in a next generation mobile communication system.
  • a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE).
  • 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (eg, such as the 60 Gigabit (60 GHz) band).
  • mmWave ultra-high frequency
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • Array antenna, analog beam-forming, and large scale antenna techniques are discussed.
  • 5G communication systems have advanced small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation
  • cloud RAN cloud radio access network
  • ultra-dense network ultra-dense network
  • D2D Device to Device communication
  • CoMP Coordinated Multi-Points
  • FQAM Hybrid FSK and QAM Modulation
  • SWSC Sliding Window Superposition Coding
  • ACM Advanced Coding Modulation
  • FBMC Fan Bank Multi Carrier
  • NOMA advanced access technologies (non orthogonal multiple access), and sparse code multiple access (SCMA), and the like are being developed.
  • IoT Internet of Things
  • IoE Internet of Everything
  • M2M machine to machine
  • MTC Machine Type Communication
  • IT intelligent Internet technology services can be provided that collect and analyze data generated from connected objects to create new value in human life.
  • IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliances, advanced medical services, etc. through convergence and complex of existing information technology (IT) technology and various industries. It can be applied to.
  • the 5G system considers support for various services compared to the existing 4G system.
  • the most representative services are enhanced mobile broad band (eMBB), ultra-reliable and low latency communication (URLLC), and massive device-to-device communication (mMTC).
  • eMBB enhanced mobile broad band
  • URLLC ultra-reliable and low latency communication
  • mMTC massive device-to-device communication
  • eMBMS machine type communication
  • eMBMS evolved multimedia broadcast / multicast service
  • the system providing the URLLC service may be referred to as a URLLC system and the system providing the eMBB service as an eMBB system.
  • the terms service and system may be used interchangeably.
  • a wireless communication system in particular, a conventional LTE system, by masking and transmitting an RNTI value, which may mean a terminal ID, to a CRC included in a control signal, a terminal having succeeded in checking a CRC using the RNTI information has a corresponding control signal. It is determined that the signal is transmitted.
  • an RNTI value which may mean a terminal ID
  • a method of using a long CRC, a method of allocating resource mapping order, a method of masking RNTI bits by dividing them into control and data channels, and RNTI bits in two or more DCIs It provides a method and apparatus for masking the divided.
  • the downlink control channel may be divided into localized transmission and distributed transmission according to resource mapping. Different transmission schemes may be applied to each transmission scheme, and thus, each terminal may have different DMRS configuration information.
  • the 5G wireless communication system may support a variety of services having different requirements, the requirements for the downlink control channel may be different. For example, different DMRS configuration information or a corresponding transmission scheme may be applied to each terminal to support a service requiring higher reliability.
  • the present invention provides a method for configuring DMRS in various downlink control channel transmission environments, and provides a base station and a terminal operation according thereto.
  • the present invention is to identify a TTI used for downlink control channel transmission in a wireless mobile communication system supporting a first transmission time interval (TTI) and a second TTI, if the TTI is the first TTI to the downlink control channel Determining the DM-RS for the first pattern, and if the TTI is the second TTI, determining the DM-RS for the downlink control channel as the second pattern, and the DM-RS and the downlink control according to the determination. It provides a method for transmitting a DM-RS of a base station comprising the step of transmitting a channel to the terminal.
  • TTI transmission time interval
  • the number of DM-RS resources for the downlink control channel determined based on the first pattern and the number of DM-RS resources for the downlink control channel determined based on the second pattern may be different.
  • the length of the second TTI is shorter than the length of the first TTI, and the number of DM-RS resources for the downlink control channel determined based on the second pattern is determined based on the first pattern. It may be larger than the number of DM-RS resources for the downlink control channel.
  • the present invention provides a method for identifying a TTI used for reception of a downlink control channel in a wireless mobile communication system supporting a first transmission time interval (TTI) and a second TTI, and wherein the TTI corresponds to the first pattern if the TTI is the first TTI.
  • TTI transmission time interval
  • Receiving the downlink control channel using a DM-RS (demodulation reference signal) transmitted based on, and the downlink control using a DM-RS transmitted based on a second pattern if the TTI is the second TTI It provides a control channel reception method of a terminal comprising the step of receiving a channel.
  • DM-RS demodulation reference signal
  • the number of DM-RS resources transmitted based on the first pattern may be different from the number of DM-RS resources transmitted based on the second pattern.
  • the length of the second TTI is shorter than the length of the first TTI, and the number of DM-RS resources transmitted based on the second pattern is larger than the number of DM-RS resources transmitted based on the first pattern. Can be.
  • the present invention identifies a TTI used for transmission and reception and downlink control channel transmission in a wireless mobile communication system supporting a first transmission time interval (TTI) and a second TTI, and if the TTI is the first TTI, the downlink control A DM-RS (demodulation reference signal) for a channel is determined as a first pattern, and if the TTI is a second TTI, the DM-RS for the downlink control channel is determined as a second pattern, and the DM- according to the determination is determined. It provides a base station including a control unit for transmitting an RS and the downlink control channel to the terminal.
  • TTI transmission time interval
  • DM-RS demodulation reference signal
  • the number of DM-RS resources for the downlink control channel determined based on the first pattern and the number of DM-RS resources for the downlink control channel determined based on the second pattern may be different.
  • the length of the second TTI is shorter than the length of the first TTI, and the number of DM-RS resources for the downlink control channel determined based on the second pattern is determined based on the first pattern. It may be larger than the number of DM-RS resources for the downlink control channel.
  • the present invention identifies a TTI used for reception of a transceiver and a downlink control channel in a wireless mobile communication system supporting a first transmission time interval (TTI) and a second TTI, and wherein the TTI is the first TTI.
  • the downlink control channel is received using a DM-RS (demodulation reference signal) transmitted based on a pattern, and the downlink is transmitted using a DM-RS transmitted based on a second pattern if the TTI is the second TTI.
  • a terminal including a control unit for receiving a link control channel.
  • the number of DM-RS resources transmitted based on the first pattern may be different from the number of DM-RS resources transmitted based on the second pattern.
  • the length of the second TTI is shorter than the length of the first TTI, and the number of DM-RS resources transmitted based on the second pattern is larger than the number of DM-RS resources transmitted based on the first pattern. Can be.
  • the present invention identifies an aggregation level of a transceiver and a downlink control channel in a wireless mobile communication system. If the determined aggregation level of the downlink control channel is less than a predetermined threshold, the DM for the downlink control channel is determined. Determine a demodulation reference signal (RS) as a first pattern, and determine a DM-RS for the downlink control channel as a second pattern when the determined integration level of the downlink control channel is greater than or equal to the threshold; It provides a base station including a control unit for transmitting the DM-RS and the downlink control channel to the terminal.
  • RS demodulation reference signal
  • the number of DM-RS resources for the downlink control channel determined based on the first pattern and the number of DM-RS resources for the downlink control channel determined based on the second pattern may be different.
  • the number of DM-RS resources for the downlink control channel determined based on the second pattern may be greater than the number of DM-RS resources for the downlink control channel determined based on the first pattern.
  • the present invention provides an operation method for distinguishing which user the control signal is transmitted to when there are many users, so that the base station can support a large number of terminals at the same time.
  • the present invention provides a DMRS signal transmission method for the downlink control signal in the 5G communication system to efficiently operate a 5G wireless communication system that supports a variety of services having different requirements simultaneously.
  • 1A is a diagram illustrating a downlink time-frequency domain transmission structure of an LTE or LTE-A system.
  • 1B is a diagram illustrating an uplink time-frequency domain transmission structure of an LTE or LTE-A system.
  • FIG. 1C is a diagram illustrating data for eMBB, URLLC, and mMTC allocated to frequency-time resources in a communication system.
  • FIG. 1D is a view showing how data for eMBB, URLLC, and mMTC are allocated in frequency-time resources in a communication system.
  • FIG. 1E is a diagram illustrating a structure in which one transport block is divided into multiple code blocks and a CRC is added.
  • Figure 1f is a diagram showing an example of a structure for a method for configuring a sub-TB and CB of the present invention and add a CRC.
  • 1G is a diagram showing an example of a structure for a method of configuring a sub-TB and CB of the present invention and adding a CRC.
  • 1H is a diagram showing an example of a structure for a method of configuring a sub-TB and CB of the present invention and adding a CRC.
  • 1I is a diagram showing an example of a structure for a method of configuring a sub-TB and a CB of the present invention and adding a CRC.
  • FIG. 1J is a diagram illustrating that an RNTI is masked on a CRC of a control signal in a conventional LTE system.
  • 1K is a diagram illustrating an example of a terminal classification method according to a first embodiment.
  • 1L is a diagram illustrating an example of a terminal classification method according to a second embodiment.
  • FIG. 1la is a method of defining a group of subcarriers and using a mapping order for indicating the order of the groups.
  • 1M is a diagram illustrating a procedure of a transmitter according to a second embodiment.
  • FIG. 1ma is a diagram illustrating a procedure of allocating an RNTI to a terminal and using the same to indicate REG mapping order information.
  • 1N is a diagram illustrating an example of a terminal classification method according to a third embodiment.
  • 1O is a diagram illustrating an example of a terminal classification method according to a fourth embodiment.
  • 1P is a diagram illustrating an internal structure of a terminal according to embodiments of the present invention.
  • 1Q is a diagram illustrating an internal structure of a base station according to embodiments of the present invention.
  • 2A is a diagram illustrating a basic structure of a time-frequency domain in LTE.
  • FIG. 2B is a diagram illustrating PDCCH and EPDCCH, which are downlink control channels of LTE.
  • 2C illustrates a 5G downlink control channel.
  • 2D illustrates resource allocation of a 5G downlink control channel.
  • 2E illustrates an example of UE-specific DMRS port configuration.
  • 2F is a diagram illustrating a DMRS pattern according to an embodiment of the present invention.
  • 2ga and 2gb illustrate a DMRS setting method according to the second embodiment of the present invention.
  • 2ha and 2hb are diagrams illustrating a DMRS setting method according to a third embodiment of the present invention.
  • FIGS. 2A and 2B illustrate a DMRS setting method according to a third embodiment of the present invention.
  • 2ja and 2jb illustrate a DMRS setting method according to a fourth embodiment of the present invention.
  • 2ka and 2kb are diagrams illustrating a DMRS setting method according to a fifth embodiment of the present invention.
  • 2L is a block diagram illustrating an internal structure of a terminal according to an exemplary embodiment of the present invention.
  • 2m is a block diagram illustrating an internal structure of a base station according to an embodiment of the present invention.
  • a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE).
  • 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (eg, such as the 60 Gigabit (60 GHz) band).
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • FD-MIMO massive array multiple input / output
  • Array antenna, analog beam-forming, and large scale antenna techniques are discussed.
  • 5G communication systems have advanced small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation
  • cloud RAN cloud radio access network
  • D2D Device to Device communication
  • D2D Device to Device communication
  • CoMP Coordinated Multi-Points
  • FQAM Hybrid FSK and QAM Modulation
  • SWSC Slide Window Superposition Coding
  • ACM Advanced Coding Modulation
  • FBMC Fan Bank Multi Carrier
  • IoT Internet of Things
  • IoE Internet of Everything
  • M2M machine to machine
  • MTC Machine Type Communication
  • IT intelligent Internet technology services can be provided that collect and analyze data generated from connected objects to create new value in human life.
  • IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliances, advanced medical services, etc. through convergence and complex of existing information technology (IT) technology and various industries. It can be applied to.
  • the new 5G communication NR (New Radio access technology) is designed to allow various services to be freely multiplexed in time and frequency resources. Accordingly, waveform / numerology and reference signals are dynamically changed according to the needs of the corresponding service. Can be assigned freely.
  • optimized data transmission by measuring channel quality and interference amount is important. Therefore, accurate channel state measurement is essential.
  • the frequency resource group (FRG) can be divided and measured. Requires support for a subset of.
  • the types of supported services can be divided into categories such as Enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (mMTTC), and Ultra-Reliable and Low-latency Communications (URLLC).
  • eMBB is a high-speed data transmission
  • mMTC is a terminal for minimizing the power of the terminal and accessing a large number of terminals
  • URLLC is a service aimed at high reliability and low latency. Different requirements may be applied depending on the type of service applied to the terminal.
  • a plurality of services may be provided to a user in a communication system, and in order to provide the plurality of services to a user, a method and an apparatus using the same are required to provide each service within a same time period according to characteristics. .
  • each block of the flowchart illustrations and combinations of flowchart illustrations may be performed by computer program instructions. Since these computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, those instructions executed through the processor of the computer or other programmable data processing equipment may be described in flow chart block (s). It creates a means to perform the functions. These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block (s).
  • Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions for performing the processing equipment may also provide steps for performing the functions described in the flowchart block (s).
  • each block may represent a portion of a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s).
  • logical function e.g., a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s).
  • the functions noted in the blocks may occur out of order.
  • the two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending on the corresponding function.
  • ' ⁇ part' used in the present embodiment refers to software or a hardware component such as an FPGA or an ASIC, and ' ⁇ part' performs certain roles.
  • ' ⁇ ' is not meant to be limited to software or hardware.
  • ' ⁇ Portion' may be configured to be in an addressable storage medium or may be configured to play one or more processors.
  • ' ⁇ ' means components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, procedures, and the like. Subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables.
  • components and the 'parts' may be combined into a smaller number of components and the 'parts' or further separated into additional components and the 'parts'.
  • the components and ' ⁇ ' may be implemented to play one or more CPUs in the device or secure multimedia card.
  • ' ⁇ part' may include one or more processors.
  • the wireless communication system has moved away from providing the initial voice-oriented service, for example, 3GPP High Speed Packet Access (HSPA), Long Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-Advanced.
  • HSPA High Speed Packet Access
  • LTE Long Term Evolution
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • LTE-Advanced Advances in broadband wireless communication systems that provide high-speed, high-quality packet data services such as LTE-A, 3GPP2's High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE's 802.16e Doing.
  • 5G or NR (new radio) communication standard is being developed as a 5th generation wireless communication system.
  • an LTE system employs an orthogonal frequency division multiplexing (OFDM) scheme in downlink (DL), and a single carrier frequency division multiple (SC-FDMA) in uplink (UL). Access) method is adopted.
  • Uplink refers to a radio link through which a user equipment (UE) or mobile station (MS) transmits data or a control signal to a base station (eNode B or base station (BS)), and the downlink means a base station is a terminal.
  • UE user equipment
  • MS mobile station
  • eNode B or base station (BS) base station
  • data or control information of each user is classified by assigning and operating such that time-frequency resources for carrying data or control information for each user do not overlap each other, that is, orthogonality is established. do.
  • the LTE system employs a hybrid automatic repeat request (HARQ) scheme in which the data is retransmitted in the physical layer when a decoding failure occurs in the initial transmission.
  • HARQ hybrid automatic repeat request
  • the receiver when the receiver does not correctly decode (decode) the data, the receiver transmits NACK (Negative Acknowledgement) informing the transmitter of the decoding failure so that the transmitter can retransmit the corresponding data in the physical layer.
  • NACK Negative Acknowledgement
  • the receiver combines the data retransmitted by the transmitter with previously decoded data to improve data reception performance.
  • the transmitter may transmit an acknowledgment (ACK) indicating the decoding success to the transmitter so that the transmitter may transmit new data.
  • ACK acknowledgment
  • FIG. 1A illustrates a basic structure of a time-frequency domain, which is a radio resource region in which the data or control channel is transmitted in downlink in an LTE system.
  • the horizontal axis represents the time domain and the vertical axis represents the frequency domain.
  • the minimum transmission unit in the time domain is an OFDM symbol, in which N symb (1a-02) OFDM symbols are gathered to form one slot 1a-06, and two slots are gathered to form one subframe (1a-05). Configure The length of the slot is 0.5ms and the length of the subframe is 1.0ms.
  • the radio frame 1a-14 is a time domain unit composed of 10 subframes.
  • the minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth consists of N BW (1a-04) subcarriers.
  • the basic unit of resource in the time-frequency domain may be represented by an OFDM symbol index and a subcarrier index as a resource element (RE).
  • the resource block 1a-08 (Resource Block; RB or PRB) includes N symb (1a-02) consecutive OFDM symbols in the time domain and N RB (1a-10) consecutive subcarriers in the frequency domain. Is defined as Therefore, one RB 1a-08 is composed of N symb x N RB REs 1a-12.
  • the minimum transmission unit of data is the RB unit.
  • the data rate increases in proportion to the number of RBs scheduled to the UE.
  • the LTE system defines and operates six transmission bandwidths. In the case of an FDD system in which downlink and uplink are divided into frequencies, the downlink transmission bandwidth and the uplink transmission bandwidth may be different.
  • the channel bandwidth represents an RF bandwidth corresponding to the system transmission bandwidth. Table 1 shows the correspondence between the system transmission bandwidth and the channel bandwidth defined in the LTE system. For example, an LTE system with a 10 MHz channel bandwidth consists of 50 RBs in transmission bandwidth.
  • the downlink control information may be transmitted within the first N OFDM symbols in the subframe.
  • N ⁇ 1, 2, 3 ⁇ . Accordingly, the N value may be variably applied to each subframe according to the amount of control information to be transmitted in the current subframe.
  • the transmitted control information may include a control channel transmission interval indicator indicating how many control information is transmitted over OFDM symbols, scheduling information for downlink data or uplink data, and information about HARQ ACK / NACK.
  • DCI downlink control information
  • DCI is defined according to various formats, and according to each format, whether or not scheduling information (UL grant) for uplink data or scheduling information (DL grant) for downlink data, and whether the size of control information is compact DCI. It may indicate whether to apply spatial multiplexing using multiple antennas, whether or not it is a DCI for power control.
  • DCI format 1 which is scheduling control information (DL grant) for downlink data, may include at least one of the following control information.
  • Resource allocation type 0/1 flag Indicates whether the resource allocation method is type 0 or type 1.
  • Type 0 uses the bitmap method to allocate resources in resource block group (RBG) units.
  • the basic unit of scheduling is an RB represented by time and frequency domain resources, and the RBG is composed of a plurality of RBs to become a basic unit of scheduling in a type 0 scheme.
  • Type 1 allows allocating a specific RB within the RBG.
  • Resource block assignment indicates an RB allocated for data transmission.
  • the resource to be expressed is determined by the system bandwidth and the resource allocation method.
  • Modulation and coding scheme indicates the modulation scheme used for data transmission and the size of a transport block, which is data to be transmitted.
  • HARQ process number indicates a process number of HARQ.
  • New data indicator indicates whether HARQ initial transmission or retransmission.
  • -Redundancy version indicates a redundant version of HARQ.
  • TPC Transmit Power Control
  • PUCCH Physical Uplink Control CHannel
  • PUCCH indicates a transmit power control command for PUCCH, which is an uplink control channel.
  • the DCI is a physical downlink control channel (PDCCH) (or control information, hereinafter referred to as used interchangeably) or an enhanced PDCCH (EPDCCH) (or enhanced control information), which is a downlink physical control channel through channel coding and modulation processes. Can be used interchangeably).
  • PDCCH physical downlink control channel
  • EPDCCH enhanced PDCCH
  • the DCI is scrambled with a specific Radio Network Temporary Identifier (RNTI) (or UE identifier) independently for each UE, and a CRC (cyclic redundancy check) is added, and after channel coding, each DCP is composed of independent PDCCHs. Is sent. In the time domain, the PDCCH is mapped and transmitted during the control channel transmission period. The frequency domain mapping position of the PDCCH is determined by the identifier (ID) of each terminal and can be transmitted by spreading over the entire system transmission band.
  • RNTI Radio Network Temporary Identifier
  • CRC cyclic redundancy check
  • the downlink data may be transmitted on a physical downlink shared channel (PDSCH) which is a physical channel for downlink data transmission.
  • PDSCH may be transmitted after the control channel transmission interval, and scheduling information such as specific mapping position and modulation scheme in the frequency domain is determined based on the DCI transmitted through the PDCCH.
  • the base station notifies the modulation scheme applied to the PDSCH to be transmitted and the transport block size (TBS) of the data to be transmitted.
  • the MCS may consist of 5 bits or more or fewer bits.
  • the TBS corresponds to a size before channel coding for error correction is applied to data (transport block, TB) that the base station intends to transmit.
  • Modulation schemes supported by the LTE system are Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (16QAM), and 64QAM, and each modulation order (Qm) corresponds to 2, 4, and 6. That is, 2 bits per symbol for QPSK modulation, 4 bits per symbol for 16QAM modulation, and 6 bits per symbol for 64QAM modulation.
  • QPSK Quadrature Phase Shift Keying
  • 16QAM Quadrature Amplitude Modulation
  • Qm modulation order
  • modulation schemes of 256QAM or more may be used depending on system modifications.
  • FIG. 1B illustrates a basic structure of a time-frequency domain, which is a radio resource region in which data or a control channel is transmitted in uplink in an LTE-A system.
  • the horizontal axis represents the time domain and the vertical axis represents the frequency domain.
  • the minimum transmission unit in the time domain is an SC-FDMA symbol 1b-02, and NsymbUL SC-FDMA symbols may be collected to form one slot 1b-06. Two slots are gathered to form one subframe 1b-05.
  • the minimum transmission unit in the frequency domain is a subcarrier, and the entire system transmission bandwidth (1b-04) is composed of a total of NBW subcarriers.
  • the NBW may have a value proportional to the system transmission band.
  • the basic unit of resource in the time-frequency domain may be defined as a SC-FDMA symbol index and a subcarrier index as a resource element (RE, 1b-12).
  • the resource block pair 1b-08 (RB pair) may be defined as NsymbUL contiguous SC-FDMA symbols in the time domain and NscRB contiguous subcarriers in the frequency domain. Therefore, one RB is composed of NsymbUL x NscRB REs.
  • the minimum transmission unit for data or control information is in RB units.
  • PUCCH is mapped to a frequency domain corresponding to 1 RB and transmitted during one subframe.
  • PUCCH or PUSCH which is an uplink physical channel for transmitting HARQ ACK / NACK corresponding to a PDCCH / EPDDCH including a PDSCH or a semi-persistent scheduling release (SPS release), which is a physical channel for downlink data transmission.
  • SPS release semi-persistent scheduling release
  • the timing relationship of is defined. For example, in an LTE system operating with frequency division duplex (FDD), HARQ ACK / NACK corresponding to a PDCCH / EPDCCH including a PDSCH or an SPS release transmitted in an n-4th subframe is transmitted to a PUCCH or PUSCH in an nth subframe. Is sent.
  • FDD frequency division duplex
  • downlink HARQ adopts an asynchronous HARQ scheme in which data retransmission time is not fixed. That is, when the HARQ NACK is fed back from the terminal to the initial transmission data transmitted by the base station, the base station freely determines the transmission time of the retransmission data by the scheduling operation. The UE buffers the data determined to be an error as a result of decoding the received data for the HARQ operation, and then performs combining with the next retransmission data.
  • k is defined differently according to FDD or time division duplex (TDD) and subframe configuration of the LTE system.
  • k is defined differently according to FDD or time division duplex (TDD) and subframe configuration of the LTE system.
  • TDD time division duplex
  • k is fixed to 4.
  • k may be changed according to subframe configuration and subframe number.
  • the uplink HARQ adopts a synchronous HARQ scheme with a fixed data transmission time point.
  • a Physical Uplink Shared Channel (PUSCH), which is a physical channel for transmitting uplink data
  • a PDCCH which is a preceding downlink control channel
  • a PHICH Physical Hybrid
  • the uplink / downlink timing relationship of the indicator channel is fixed by the following rule.
  • the UE When the UE receives the PDCCH including the uplink scheduling control information transmitted from the base station or the PHICH in which downlink HARQ ACK / NACK is transmitted in subframe n, the UE transmits uplink data corresponding to the control information in subframe n + k. Transmit through PUSCH.
  • k is defined differently according to FDD or time division duplex (TDD) of LTE system and its configuration. For example, in the case of the FDD LTE system, k is fixed to 4. Meanwhile, in the TDD LTE system, k may be changed according to subframe configuration and subframe number.
  • the terminal receives the uplink scheduling grant or downlink control signal and data in subframe n.
  • the UE transmits uplink data in subframe n + 4. If the downlink control signal and data are received in subframe n, the UE transmits HARQ ACK or NACK for the downlink data in subframe n + 4. Therefore, the UE can receive uplink scheduling approval, transmit uplink data, or receive downlink data, and be ready to transmit HARQ ACK or NACK is 3 ms corresponding to three subframes.
  • the PHICH When the terminal receives the PHICH carrying downlink HARQ ACK / NACK from the base station in subframe i, the PHICH corresponds to the PUSCH transmitted by the terminal in subframe i-k.
  • k is defined differently according to the FDD or TDD of LTE system and its configuration. For example, in the case of the FDD LTE system, k is fixed to 4. Meanwhile, in the TDD LTE system, k may be changed according to subframe configuration and subframe number.
  • 1C and 1D show how data for eMBB, URLLC, and mMTC, which are services considered in a 5G or NR system, are allocated in frequency-time resources.
  • data for eMBB, URLLC, and mMTC are allocated in the entire system frequency band 1c-00.
  • URLLC data (1c-03, 1c-05, 1c-07) occurs and transmission is necessary.
  • 01) and mMTC (1c-09) can transmit the URLLC data (1c-03, 1c-05, 1c-07) without emptying or transmitting the portion already allocated.
  • URLLC data may be allocated (1c-03, 1c-05, 1c-07) to a part of the resource (1c-01) to which the eMBB is allocated.
  • eMBB data may not be transmitted in the overlapping frequency-time resource, and thus transmission performance of the eMBB data may be lowered. That is, in the above case, eMBB data transmission failure due to URLLC allocation may occur.
  • the entire system frequency band 1d-00 may be divided and used to transmit service and data in each subband 1d-02, 1d-04, and 1d-06.
  • Information related to the subband configuration may be predetermined, and this information may be transmitted by the base station to the terminal through higher signaling. Alternatively, information related to the subbands may be arbitrarily divided by a base station or a network node to provide services to the terminal without transmitting subband configuration information.
  • FIG. 1D- shows that subband 1d-02 is used for eMBB data transmission, subband 404 is URLLC data transmission, and in subband 1d-06, mMTC data transmission.
  • the length of a transmission time interval (TTI) used for URLLC transmission may be shorter than the length of TTI used for eMBB or mMTC transmission.
  • the response of the information related to the URLLC can be sent faster than eMBB or mMTC, thereby transmitting and receiving information with a low delay.
  • FIG. 1E illustrates a process in which one transport block is divided into several code blocks and a CRC is added.
  • one transport block (TB) to be transmitted in uplink or downlink may be added with a CRC (1e-03) at the end or the beginning.
  • the CRC may have 16 bits or 24 bits or a fixed number of bits, or may have a variable number of bits depending on channel conditions, and may be used to determine whether channel coding is successful.
  • the blocks 1e-01 and 1e-03 to which TB and CRC are added may be divided into a plurality of codeblocks CBs 1e-07, 1e-09, 1e-11, and 1e-13 (1e). -05).
  • the code block may be divided by a predetermined maximum size.
  • the last code blocks 1e-13 may be smaller than other code blocks, or 0, a random value, or 1 may be used to set the length of other code blocks. Can be adjusted to be the same.
  • CRCs 1e-17, 1e-19, 1e-21, and 1e-23 may be added to the divided code blocks, respectively (1e-15).
  • the CRC may have 16 bits or 24 bits or a fixed number of bits, and may be used to determine whether channel coding is successful.
  • the CRCs (1e-03) added to the TB and the CRCs (1e-17, 1e-19, 1e-21, 1e-23) added to the code block may be omitted according to the type of channel code to be applied to the code block. It may be.
  • the CRCs 1e-17, 1e-19, 1e-21, and 1e-23 to be inserted for each code block may be omitted.
  • CRCs 1e-17, 1e-19, 1e-21, and 1e-23 may be added to the code block as it is.
  • CRC may be added or omitted even when polar codes are used.
  • FIG. 1F illustrates a method of dividing one TB into M sub-TBs (1f-01) and dividing each sub-TB into one or more CBs (1f-05).
  • 1f-11 is one TB transmitted from the upper layer to the physical layer. In the physical layer, the TB 1f-11 is regarded as data.
  • CRC is added to the TB (1f-13).
  • TB (1f-11) and a cyclic generator polynomial may be used to generate the CRC (1f-13), and the cyclic generator polynomial may be defined in various ways.
  • a cyclic generator polynomial g CRC24A (D) for a 24-bit CRC D 24 + D 23 + D 18 + D 17 + D 14 + D 11 + D 10 + D 7 + D 6 + D 5 + D 4
  • + D 3 + D + 1 and L 24
  • CRC p 0 , p 1 , p 2 , p 3 , ..., p L -1 is a 0 D A +23 + a 1 D A + 22 + ... + a A - 1 D 24 + p 0 D 23 + p 1 D 22 + ...
  • CRC24A D
  • p 0 , p 1 , p 2 , p 3 , ..., p L -1 the value that the remainder becomes 0 Can be.
  • the CRC length L has been described as an example of 24, the length may be determined in various lengths such as 12, 16, 24, 32, 40, 48, and 64.
  • the M sub-TB is divided (1f-01).
  • the CRC added to the TB is divided into M sub-TBs 1f-21 and 1f-23.
  • CRCs 1f-33 and 1f-37 are added to each of the divided sub-TBs 1f-31 and 1f-35 (1f-03).
  • a CRC having a different length or a different cyclic generator polynomial may be used as the CRC added to the sub-TB.
  • the divided sub-TB and the added CRC are divided into several CBs 1f-41, 1f-42, 1f-45, and 1f-47 (1f-05).
  • CRCs 1f-52, 1f-54, 1f-56, and 1f-58 are added to the divided CBs 1f-51, 1f-53, 1f-55, and 1f-57, respectively (1f-07). .
  • 1G, 1H, and 1I show a modified method of the method provided in FIG. 1F, respectively.
  • the CRC of TB (1f-13), the CRC of sub-TB (1f-33, 1f-37), and the CRC of CB (1f-52, 1f-54, 1f-56, 1f-58) are all used.
  • 1G no CRC of TB is added. This may be to lower the CRC overhead.
  • the CRC is not added to the sub-TB
  • FIG. 1I the CRC is not added to the CB.
  • the sub-TB may be a codeblock group (CBG).
  • FIG. 1J is a diagram illustrating a method of identifying a control signal by a terminal by allocating a 16-bit RNTI to a terminal and transmitting a control signal by masking the allocated RNTI value to a control signal in a conventional LTE system.
  • DCI downlink control information
  • a 16-bit CRC is added to the last portion (1j-01)
  • a 16-bit RNTI value is added to the CRC through an XOR operation (1j-03) (1j-05).
  • the RNTI value may be used for terminal classification or control signal usage classification.
  • the terminal knows the SI-RNTI value, and the SI-RNTI value can be used to detect a control signal for system information transmission.
  • the eMBB service described below is called a first type service, and the eMBB data is called first type data.
  • the first type of service or the first type of data is not limited to the eMBB but may also be applicable to a case where high-speed data transmission is required or broadband transmission is required.
  • the URLLC service is referred to as a second type service, and the URLLC data is referred to as second type data.
  • the second type service or the second type data is not limited to URLLC, but may also correspond to a case in which low latency is required, high reliability transmission is required, or other systems in which low latency and high reliability are simultaneously required.
  • the mMTC service is referred to as type 3 service, and the data for mMTC is referred to as type 3 data.
  • the third type service or the third type data is not limited to the mMTC and may correspond to a case where a low speed, wide coverage, or low power is required.
  • the first type service includes or does not include the third type service.
  • the structure of the physical layer channel used for each type to transmit the three types of services or data may be different. For example, at least one of a length of a transmission time interval (TTI), an allocation unit of frequency resources, a structure of a control channel, and a data mapping method may be different.
  • the terms physical channel and signal in the conventional LTE or LTE-A system may be used.
  • the contents of the present invention can be applied in a wireless communication system other than the LTE and LTE-A systems.
  • the embodiment defines the transmission and reception operations of the terminal and the base station for the first type, the second type, the third type of service or data transmission, and the terminals receiving different types of service or data scheduling in the same system. Suggests specific ways to work together.
  • the first type, the second type, and the third type terminal refer to terminals which have received one type, second type, third type service or data scheduling, respectively.
  • the first type terminal, the second type terminal, and the third type terminal may be the same terminal or may be different terminals.
  • the base station is a subject performing resource allocation of the terminal, and may be at least one of an eNode B, Node B, BS (Base Station), a radio access unit, a base station controller, or a node on a network.
  • the terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function.
  • UE user equipment
  • MS mobile station
  • DL downlink
  • UL uplink of a signal transmitted from a terminal to a base station.
  • the following describes an embodiment of the present invention using an LTE or LTE-A system as an example, but the embodiment of the present invention may be applied to other communication systems having a similar technical background or channel form.
  • the fifth generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in this.
  • the embodiment of the present invention may be applied to other communication systems through some modifications within the scope of the present invention without departing from the scope of the present invention by the judgment of those skilled in the art.
  • a transmission time interval may mean a unit in which a control signal and a data signal are transmitted, or may mean a unit in which a data signal is transmitted.
  • the transmission time interval is a subframe that is a time unit of 1 ms.
  • the transmission time interval in the uplink may mean a unit in which a control signal or a data signal is sent or a unit in which a data signal is transmitted.
  • the transmission time interval in the uplink of the existing LTE system is a subframe that is the same time unit of 1 ms as the downlink.
  • one of the important criteria of cellular wireless communication system performance is the packet data latency.
  • a signal is transmitted and received in units of subframes having a Transmission Time Interval (TTI) of 1 ms.
  • TTI Transmission Time Interval
  • a short-TTI UE having a transmission time interval shorter than 1 ms may be supported.
  • a transmission time interval may be shorter than 1 ms.
  • Short-TTI terminals are expected to be suitable for services such as voice over LTE (VoLTE) services and remote control where latency is important.
  • the short-TTI terminal is expected to be a means for realizing a mission critical Internet of Things (IoT) on a cellular basis.
  • IoT mission critical Internet of Things
  • the terms physical channel and signal in the conventional LTE or LTE-A system may be used interchangeably with data or control signals.
  • the PDSCH is a physical channel through which normal-TTI data is transmitted, the PDSCH may be referred to as normal-TTI data in the present invention.
  • the uplink scheduling grant signal and the downlink data signal are referred to as a first signal.
  • the uplink data signal for the uplink scheduling grant and the HARQ ACK / NACK for the downlink data signal are referred to as a second signal.
  • the signal transmitted from the base station to the terminal, if the signal expects a response from the terminal may be a first signal
  • the response signal of the terminal corresponding to the first signal may be a second signal.
  • the service type of the first signal may belong to a category such as eMBB, mMTC, URLLC, and the like.
  • the TTI length of the first signal means the length of time that the first signal is transmitted.
  • the TTI length of the second signal means the length of time that the second signal is transmitted.
  • the second signal transmission timing is information on when the terminal transmits the second signal and when the base station receives the second signal, and may be referred to as a second signal transmission timing.
  • TDD system If there is no mention of a TDD system in the present invention, a general description will be made of the FDD system. However, the method and apparatus of the present invention in an FDD system may be applied to a TDD system according to a simple modification.
  • higher signaling is a signal transmission method transmitted from a base station to a terminal using a downlink data channel of a physical layer, or from a terminal to a base station using an uplink data channel of a physical layer, and is an RRC signaling or a MAC control element. It may also be referred to as a (CE) control element.
  • the transmitting end may refer to a base station in downlink and a terminal in uplink.
  • the receiving end may mean a terminal in downlink and a base station in uplink.
  • the first embodiment allocates an RNTI having a length greater than 16 bits to the terminal, masks the assigned RNTI value to a control signal, and transmits a control signal to FIG. It demonstrates with reference.
  • the downlink control information has a length longer than 16 bits, for example, a 24-bit CRC added to the last part (1k-01), and a 24-bit RNTI value through an XOR operation (1k-03) to the CRC. Add 24 bits of RNTI (1k-05).
  • the RNTI value may be used for terminal classification or control signal usage classification.
  • the terminal knows the SI-RNTI value, and the SI-RNTI value can be used to detect a control signal for system information transmission.
  • the RNTI having a length longer than 16 bits may be used to provide a third type service or to transmit third type data.
  • a second embodiment of the present invention will be described with reference to FIG. 1L for a method of classifying terminals by differently mapping control signals or data in specific resource blocks. That is, the present invention proposes a control signal and data signal mapping method for user identification.
  • a resource element group (REG), a control channel element (CCE), and a PDCCH may be defined.
  • the REG may be composed of several REs, and may be, for example, a bundle of REs consisting of 12 consecutive subcarriers in one OFDM symbol. That is, 12 consecutive REs may constitute one REG.
  • the CCE may be defined as a bundle of several REGs, and one PDCCH may be mapped to several CCEs.
  • the control signal or data signal mapping method described in this embodiment may refer to an order of REs mapped when a control signal is mapped to one REG or when mapped to a PRB including 12 subcarriers.
  • this may mean the order of REGs mapped in multiple REGs constituting one CCE or the order of CCEs mapped in multiple CCEs constituting one PDCCH.
  • This embodiment will be described using the order of REs to which signals are mapped in one REG, but need not be limited to the order of REs mapped in one REG.
  • the above-described mapping order may be referred to as an RE mapping order or an REG mapping order in the REG.
  • (A) of FIG. 1L is an example of a conventional system for sequentially mapping control signals and data to 12 subcarriers or one REG present in one OFDM symbol of one PRB.
  • 11-1 represents an order in which symbols such as encoded QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM of control and data signals are mapped in one PRB.
  • the mapping order may be determined differently for each terminal to notify the terminal. For example, mapping of 12 subcarriers in order is performed in the order of subcarriers 5, 3, 0, 9, 4, 11, 7, 2, 8, 10, 1, and 6 as shown in (b) of FIG. Do it.
  • 1-1-11 indicates an order in which a specific terminal maps a control signal and a data signal in one PRB.
  • reference signals are mapped to 12 subcarriers in the PRB, only subcarriers except for subcarriers mapped as shown in FIG. 1L (c) may be mapped in order.
  • RS is mapped to subcarriers 2,6,10 (1l-31, 1l-33, and 1l-35). Therefore, in this case, the control signal and the data signal may be mapped in the order allocated in advance in the remaining subcarriers.
  • FIG. 1la is a method of defining a group of subcarriers and using a mapping order for indicating the order of the groups.
  • signals are sequentially mapped from the smallest subcarrier number.
  • FIG. 1la is intended to map a signal to one REG or 12 subcarriers, one REG is divided into three subcarrier groups, and the order of three subcarriers is transmitted to the UE through higher signaling or some bits of the RNTI.
  • Is a diagram illustrating an example of a method of transmitting a signal, and is sequentially mapped in one subcarrier group.
  • 1la is intended to map a signal to one REG or 12 subcarriers, one REG is divided into 6 subcarrier groups, and the order of three subcarriers is transmitted to the UE through higher signaling or some bits of the RNTI.
  • the base station transmits information on the mapping order to the terminal to the terminal through higher signaling (1m-01).
  • the information on the mapping order is information on 12 subcarriers, which may be used for every PRB, or may be a form in which the order information of four subcarriers is repeatedly repeated. That is, the order is determined within four subcarriers, and the groups of the four subcarriers are sequentially mapped.
  • transmitting a control signal and a data signal to a specific terminal it maps to resources in the preset order (1m-03).
  • the terminal may be used to decode and decode the control signal or the data signal by using the received mapping order information.
  • the information of the mapping order to be assumed for decoding by the UE may be obtained from its own C-RNTI value that is not allocated separately from the base station. For example, a 24-bit RNTI may be allocated, and the most significant (most significant or most leftside) 5 bits or the least significant (most rightside) 5 bits may be interpreted as information on the mapping order. Thereafter, the remaining 19 bits may be used as a method of masking the CRC added to the DCI, which is downlink control information.
  • the number of bits is an example presented for convenience of description, and the number of bits may be applied differently.
  • a total of 20 bits of RNTI can be set to the terminal, and 4 bits of the RNTI can be described as information indicating the order of RE mapping in the REG, and the remaining 16 bits can be used for masking the CRC added to the DCI. Can be.
  • FIG. 1ma is a diagram illustrating a procedure of allocating an RNTI to a terminal and using the same to indicate REG mapping order information.
  • the base station first sets the RNTI value to the terminal (1m-21).
  • some of the RNTI values are used as information for the REG mapping order, and the remaining bits are used for masking the CRC of the DCI (1m-23).
  • the terminal-specific control information is assumed and described.
  • the method of detecting the control information by the terminal using the mapping order includes not only the terminal-specific control information and data but also the group-specific control information transmitted to one or more terminals. It can also be applied to specific control signals or common-specific control signals.
  • the RNTI value may be set so that various terminals may know the common REG mapping order or the mapping order may be transmitted through higher signaling so that one or more terminals may correctly detect the group specific control information or the common control information. .
  • the third embodiment divides the RNTI allocated to the UE into two, one part masks the CRC of the DCI, and the other part masks the CRC of the TB or CB of the data so that the terminal can distinguish its control signal and data signal. A method of enabling the same will be described with reference to FIG. 1N.
  • the base station allocates one RNTI value to the terminal (1n-01).
  • the RNTI is divided into two parts and regarded as RNTI 1 (1n-03) and RNTI 2 (1n-05).
  • the RNTI 1 (1n-03) is masked on the CRC of the control signal DCI (1n-07), and the RNTI 2 (1n-05) is masked on the CRC of the data signal code blocks 1n-09.
  • the fourth embodiment divides the RNTI allocated to the UE into two, one part masks the CRC of the first DCI, and the other part masks the CRC of the second DCI so that the UE can distinguish its control signals. This will be described with reference to FIG. 1O.
  • the base station allocates one RNTI value to the terminal (1o-01).
  • the RNTI is divided into two parts, and is considered as RNTI 1 (1o-03) and RNTI 2 (1o-05).
  • the RNTI 1 (1o-03) is masked on the CRC of the first control signal DCI 1 (1o-07), and the RNTI 2 (1o-05) is masked on the CRC of the second control signal DCI 2 (1o-09). .
  • FIGS. 1P and 1Q a transmitter, a receiver, and a processor of the terminal and the base station are illustrated in FIGS. 1P and 1Q, respectively.
  • a transmission and reception method between a base station and a terminal in order to determine a method for distinguishing which terminal a transmission of a control signal and a data signal are transmitted and to perform an operation according thereto.
  • the receiving unit, the processing unit, and the transmitting unit of the base station and the terminal should operate according to the embodiments.
  • Figure 1p is a block diagram showing the internal structure of a terminal according to an embodiment of the present invention.
  • the terminal of the present invention may include a terminal receiver 1p-00, a terminal transmitter 1p-04, and a terminal processor 1p-02.
  • the terminal receiver 1p-00 and the terminal may collectively be referred to as a transmitter / receiver in the embodiment of the present invention.
  • the transceiver may transmit and receive a signal with the base station.
  • the signal may include control information and data.
  • the transmission and reception unit may be composed of an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low noise amplifying and down-converting the received signal.
  • the transceiver may receive a signal through a wireless channel, output the signal to the terminal processor 1p-02, and transmit a signal output from the terminal processor 1p-02 through the wireless channel.
  • the terminal processor 1p-02 may control a series of processes for operating the terminal according to the above-described embodiment of the present invention.
  • the terminal receiver 1p-00 receives the mapping order information from the base station in advance, receives the downlink control and the data signal, and controls the terminal processing unit 1p-02 to decode according to the preset mapping order. can do.
  • the base station of the present invention may include a base station receiver 1q-01, a base station transmitter 1q-05, and a base station processor 1q-03.
  • the base station receiver 1q-01 and the base station transmitter 1q-05 may be collectively referred to as a transmitter / receiver.
  • the transceiver may transmit and receive a signal with the terminal.
  • the signal may include control information and data.
  • the transmission and reception unit may be composed of an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low noise amplifying and down-converting the received signal.
  • the transceiver may receive a signal through a wireless channel, output the signal to the base station processor 1q-03, and transmit a signal output from the terminal processor 1q-03 through the wireless channel.
  • the base station processing unit 1q-03 may control a series of processes to operate the base station according to the embodiment of the present invention described above. For example, the base station processing unit 1q-03 may determine the mapping order for each terminal and control the terminal to set in advance in order to classify the terminals and transmit control signals and data signals. Subsequently, the base station transmitter 1q-05 maps the control signals and data in a predetermined order during transmission and transmits them.
  • DCI downlink control information
  • PDCCH physical downlink control channel
  • RS reference signal
  • CRS cell-specific reference signal
  • a service requiring a high transmission rate not only a service requiring a high transmission rate but also a service having a very short transmission delay and a service requiring a high connection density are intended to be supported.
  • These scenarios should be able to provide various services with different transmission / reception schemes, transmission / reception parameters in one system to satisfy various requirements and services of users, and additional services are currently being considered in consideration of future compatibility. It is important to design so that no constraints that are constrained by the system arise.
  • 5G needs to be able to utilize time and frequency resources more flexibly than existing LTE. Among them, securing flexibility is one of the most important factors, especially in the control channel design.
  • a DMRS Demodulation Reference Signal
  • the downlink control channel may be divided into localized transmission and distributed transmission according to resource mapping. Different transmission schemes may be applied to each transmission scheme, and thus, each terminal may have different DMRS configuration information.
  • the 5G wireless communication system may support a variety of services having different requirements, the requirements for the downlink control channel may be different. For example, different DMRS configuration information or a corresponding transmission scheme may be applied to each terminal to support a service requiring higher reliability. Accordingly, the present invention provides a method for configuring DMRS in various downlink control channel transmission environments, and provides a base station and a terminal operation according thereto.
  • the wireless communication system has moved away from providing the initial voice-oriented service, for example, 3GPP High Speed Packet Access (HSPA), Long Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-Advanced.
  • Broadband wireless that provides high-speed, high-quality packet data services such as LTE-A, LTE-Pro, 3GPP2's High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE 802.16e Evolving into a communication system.
  • an LTE system employs an orthogonal frequency division multiplexing (OFDM) scheme in downlink (DL), and a single carrier frequency division multiple (SC-FDMA) in uplink (UL). Access) method is adopted.
  • Uplink refers to a radio link through which a user equipment (UE) or mobile station (MS) transmits data or a control signal to a base station (eNode B or base station (BS)), and the downlink means a base station is a terminal.
  • UE user equipment
  • MS mobile station
  • eNode B or base station (BS) base station
  • data or control information of each user is classified by assigning and operating such that time-frequency resources for carrying data or control information for each user do not overlap each other, that is, orthogonality is established. do.
  • a 5G communication system should be able to freely reflect various requirements such as users and service providers, so that a service satisfying various requirements must be supported at the same time.
  • Services considered for 5G communication systems include enhanced Mobile Broadband (eMBB), massive machine type communication (mMTC), Ultra Reliability Low Latency Communciation (URLLC), etc. There is this.
  • eMBB aims to provide a higher data rate than the data rate supported by LTE, LTE-A, or LTE-Pro.
  • an eMBB should be able to provide a maximum data rate of 20 Gbps in downlink and a maximum data rate of 10 Gbps in uplink from a single base station.
  • the 5G communication system should provide a maximum transmission rate and at the same time provide an increased user perceived data rate of the terminal.
  • various transmission and reception technologies are required to be improved, including an improved Multi Input Multi Output (MIMO) transmission technology.
  • MIMO Multi Input Multi Output
  • 5G communication system uses a frequency bandwidth wider than 20MHz in the frequency band of 3 ⁇ 6GHz or 6GHz or more is required by 5G communication system It can satisfy the data transmission rate.
  • mMTC is being considered to support application services such as the Internet of Thing (IoT) in 5G communication systems.
  • IoT Internet of Thing
  • the mMTC requires large terminal access in a cell, improved terminal coverage, improved battery time, and reduced terminal cost.
  • the IoT is attached to various sensors and various devices to provide a communication function, it must be able to support a large number of terminals (eg, 1,000,000 terminals / km 2) in a cell.
  • the terminal supporting the mMTC is likely to be located in a shaded area that the cell does not cover, such as the basement of the building because of the nature of the service requires more coverage than other services provided by the 5G communication system.
  • the terminal supporting the mMTC should be configured as a low-cost terminal, and because it is difficult to replace the battery of the terminal frequently, very long battery life time (10-15 years) is required.
  • URLLC it is a cellular-based wireless communication service used for a mission-critical purpose.
  • remote control for robots or machinery, industrial automation, unmaned aerial vehicles, remote health care, emergency situations A service used for an emergency alert may be considered. Therefore, the communication provided by URLLC should provide very low latency and very high reliability.
  • a service that supports URLLC must satisfy air interface latency of less than 0.5 milliseconds, and at the same time have a requirement of a packet error rate of 10-5 or less. Therefore, for services supporting URLLC, 5G systems must provide a smaller Transmit Time Interval (TTI) than other services, while at the same time designing a wide resource allocation in the frequency band to ensure the reliability of the communication link. Is required.
  • TTI Transmit Time Interval
  • Three services of 5G, eMBB, URLLC, and mMTC can be multiplexed and transmitted in one system.
  • different transmission / reception techniques and transmission / reception parameters may be used between services to satisfy different requirements of respective services.
  • FIG. 2A illustrates a basic structure of a time-frequency domain, which is a radio resource region in which the data or control channel is transmitted in downlink in a system in LTE.
  • the horizontal axis represents the time domain and the vertical axis represents the frequency domain.
  • the minimum transmission unit in the time domain is an OFDM symbol, in which N symb (2a-01) OFDM symbols are gathered to form one slot 2a-02, and two slots are gathered to form one subframe 2a-03. Configure The length of the slot is 0.5ms and the length of the subframe is 1.0ms.
  • the radio frames 2a-04 are time-domain units composed of 10 subframes.
  • the minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth consists of N BW (2a-05) subcarriers in total.
  • the basic unit of resource in the time-frequency domain may be represented by an OFDM symbol index and a subcarrier index as resource elements 2a-06 (Resource Element, RE).
  • the resource block 2a-07 (Resource Block, RB or Physical Resource Block, PRB) includes N symb (2a-01) consecutive OFDM symbols in the time domain and N RB (2a-08) consecutive subcarriers in the frequency domain. Is defined as Thus, one RB 2a-08 is composed of N symb x N RB REs 2a-06.
  • 2B is a diagram illustrating a PDCCH (2b-01) and an Enhanced PDCCH (EPDCCH) 2b-02, which are downlink physical channels through which DCI of LTE is transmitted.
  • the PDCCH 2b-01 is time-multiplexed with the PDSCH 2b-03, which is a data transmission channel, and transmitted over the entire system bandwidth.
  • the region of the PDCCH (2b-01) is represented by the number of OFDM symbols, which is indicated to the UE by a Control Format Indicator (CFI) transmitted through the Physical Control Format Indicator Channel (PCFICH).
  • CFI Control Format Indicator
  • PCFICH Physical Control Format Indicator Channel
  • CRS 2b-04 is used as a reference signal for decoding the PDCCH 2b-01.
  • the CRSs 2b-04 are transmitted every subframe over the entire band, and scrambling and resource mapping vary according to cell IDs. Since the CRS 2b-04 is a reference signal commonly used by all terminals, UE-specific beamforming cannot be used. Therefore, the multi-antenna transmitter method for PDCCH in LTE is limited to open loop transmit diversity.
  • the port number of the CRS is implicitly known to the terminal from decoding of the PBCH (Physical Broadcast Channel).
  • Resource allocation of the PDCCH 2b-01 is based on a Control-Channel Element (CCE), and one CCE includes nine Resource Element Groups (REGs), that is, 36 RE elements in total.
  • CCE Control-Channel Element
  • REGs Resource Element Groups
  • the number of CCEs required for a specific PDCCH 2b-01 may be 1, 2, 4, or 8, depending on the channel coding rate of the DCI message payload. As such, different CCE numbers are used to implement link adaptation of the PDCCH 2b-01.
  • the UE should detect a signal without knowing information about the PDCCH (2b-01).
  • a search space indicating a set of CCEs is defined for blind decoding.
  • the search space is composed of a plurality of sets in the aggregation level (AL) of each CCE, which is not explicitly signaled and is implicitly defined through a function and a subframe number by the terminal identity.
  • the UE decodes the PDCCH 2b-01 for all possible resource candidates that can be created from CCEs in the configured search space, and declares that the UE is valid for the UE through the CRC check. Processed information
  • the search space is classified into a terminal-specific search space and a common search space.
  • a certain group of terminals or all terminals may examine the common search space of the PDCCH 2b-01 to receive cell common control information such as dynamic scheduling of paging information or a paging message.
  • cell common control information such as dynamic scheduling of paging information or a paging message.
  • the scheduling allocation information of the DL-SCH for transmitting the SIB-1 including the cell information of the cell may be received by examining the common search space of the PDCCH 2b-01.
  • the EPDCCH 2b-02 is frequency multiplexed with the PDSCH 2b-03 and transmitted.
  • the base station can properly allocate the resources of the EPDCCH (2b-02) and PDSCH (2b-03) through the scheduling, thereby effectively supporting the coexistence with the data transmission for the existing LTE terminal.
  • the EPDCCH 2b-02 is allocated and transmitted in one subframe on the time axis, there is a problem in terms of transmission delay time.
  • a plurality of EPDCCHs (2b-02) constitutes one EPDCCH (2b-02) set, and the allocation of the EPDCCH (2b-02) sets is made in units of Physical Resource Block (PRB) pairs.
  • PRB Physical Resource Block
  • the location information for the EPDCCH set is UE-specifically set and it is signaled through RRC (Remote Radio Control).
  • RRC Remote Radio Control
  • Up to two EPDCCH (2b-02) sets may be configured for each UE, and one EPDCCH (2b-02) set may be configured to be multiplexed to different UEs at the same time.
  • EPDCCH 2b-02 Resource allocation of EPDCCH (2b-02) is based on ECCE (Enhanced CCE), one ECCE can be composed of 4 or 8 EREG (Enhanced REG) and the number of EREGs per ECCE is CP length and subframe It depends on the setting information. One EREG consists of 9 REs, so there may be 16 EREGs per PRB pair.
  • the EPDCCH transmission method is divided into localized / distributed transmission according to the RE mapping method of the EREG.
  • the aggregation level of the ECCE may be 1, 2, 4, 8, 16, 32, which is determined by CP length, subframe configuration, EPDCCH format, and transmission scheme.
  • the EPDCCH 2b-02 only supports terminal-specific search spaces. Therefore, the terminal that wants to receive the system message must examine the common search space on the existing PDCCH (2b-01).
  • the EPDCCH 2b-02 uses a demodulation reference signal (DMRS) 2b-05 as a reference signal for decoding.
  • DMRS demodulation reference signal
  • the precoding for the EPDCCH 2b-02 may be set by the base station, and UE-specific beamforming may be used.
  • UEs may perform decoding on EPDCCH 2b-02 without knowing which precoding is used.
  • the EPDCCH 2b-02 uses the same pattern as the DMRS of the PDSCH 2b-03.
  • DMRS 2b-05 in EPDCCH 2b-02 can support transmission using up to four antenna ports.
  • DMRS 2b-05 is transmitted only in the corresponding PRB in which EPDCCH is transmitted.
  • Port configuration information of the DMRS 2b-05 depends on the EPDCCH (2b-02) transmission scheme.
  • the antenna port corresponding to the ECCE to which the EPDCCH 2b-02 is mapped is selected based on the ID of the UE.
  • a DMRS antenna port may be allocated to each UE.
  • the DMRS 2b-05 may be shared and transmitted.
  • the DMRS 2b-05 may be divided into a DMRS 2b-05 scrambling sequence set to higher layer signaling.
  • up to two antenna ports of the DMRS (2b-05) are supported, and a diversity scheme of a precoder cycling scheme is supported.
  • DMRS 2b-05 may be shared for all REs transmitted in one PRB pair.
  • FIG. 2C is a diagram illustrating an example of basic units of time and frequency resources constituting a downlink control channel that can be used in 5G.
  • a basic unit (REG, NR (New Radio) -REG, PRB, etc.) of the time and frequency resources constituting the control channel, NR-REG (2c-03) in the present invention.
  • (Name) is composed of one OFDM symbol (2c-01) on the time axis and twelve subcarriers (2c-02), that is, one RB on the frequency axis.
  • the data channel and the control channel can be time-multiplexed in one subframe by assuming that the time axis basic unit is 1 OFDM symbol (2c-01).
  • Positioning the control channel ahead of the data channel reduces the user's processing time, making it easy to meet latency requirements.
  • the base unit of the frequency axis of the control channel to 1 RB (2c-02)
  • frequency multiplexing between the control channel and the data channel can be performed more efficiently.
  • control channel regions of various sizes can be set.
  • one NR-CCE (2c-04) may be configured with a plurality of NR-REGs (2c-03).
  • the NR-REG (2c-04) shown in FIG. 2C may be composed of 12 REs and one NR-CCE (2c-04) is four NRs. If it consists of -REG (2c-03) means that 1 NR-CCE (2c-04) can be composed of 48 RE.
  • the corresponding region may be composed of a plurality of NR-CCEs (2c-04), and a specific downlink control channel may be configured with one or more NR-CCEs (according to aggregation level (AL) in the control region). 2c-04) may be transmitted.
  • the NR-CCEs (2c-04) in the control region are divided by numbers, and the numbers may be assigned according to a logical mapping method.
  • the basic unit of the downlink control channel illustrated in FIG. 2C that is, NR-REG (2c-03) includes all of REs to which DCI is mapped and a region to which DMRSs 2c-05, which is a reference signal for decoding them, are mapped. Can be.
  • the DMRS 2c-05 can be efficiently transmitted in consideration of overhead due to RS allocation. For example, when a downlink control channel is transmitted using a plurality of OFDM symbols, DMRS 2c-05 may be transmitted only in the first OFDM symbol.
  • the DMRS 2c-05 may be mapped and transmitted in consideration of the number of antenna ports used for transmitting the downlink control channel. 2C shows an example in which two antenna ports are used.
  • DMRSs for different antenna ports can be multiplexed in various ways.
  • 2C shows an example in which DMRSs corresponding to different antenna ports are orthogonally transmitted in different REs. In this way, FDM may be transmitted or CDM may be transmitted.
  • various types of DMRS patterns which may be related to the number of antenna ports. In the following description, it is assumed that two antenna ports are used. The same principle in the present invention can be applied to two or more antenna ports.
  • FIG. 2D is a diagram illustrating an example of a method of mapping downlink control channels in a 5G wireless communication system.
  • a resource region through which a downlink control channel can be transmitted may be defined as a control resource set 2d-03.
  • the control resource set (2d-03) can be set to a specific subband (2d-20) within the total system bandwidth (2d-10) on the frequency axis, and can be set to one or multiple OFDM symbols on the time axis. have.
  • the NR-CCEs 2d-01 and 2d-02 may be mapped to a plurality of concatenated NR-REGs. Since the localized mapping (2d-30) method is concentrated on the frequency axis, it is suitable for using UE-specific beamforming using subband precoding. Therefore, it is suitable for transmitting a UE-specific downlink control channel. In the UE-specific beamforming, 1 port DMRS may be used. In addition, DMRS must also be UE-specific in order to support UE-specific beamforming. Therefore, different terminals should be able to use different DMRS. To this end, definition of DMRS port mapping for each terminal is required. This will be described further below.
  • the NR-CCEs 2d-01 and 2d-02 are multiple NRs distributed in the subbands 2d-20 that are set to the control resource set 2d-03. May be mapped to -REG (2d-04).
  • the distributed mapping (2d-40) method is suitable for using the transmit diversity scheme because frequency diversity can be sufficiently obtained.
  • either one port or two port DMRS can be used.
  • the DMRS used at this time is preferably to be shared by the terminals, for this purpose, a DMRS sequence may be defined cell-specifically.
  • the downlink control channel in 5G should be flexible.
  • the control channel region may be set differently for each terminal or UE-group.
  • the size of the control channel region configured for each terminal / terminal-group may be determined according to various system parameters such as service scenarios such as eMBB, URLLC, and mMTC, simultaneous support of various TTIs, service for different numerology, and future compatibility guarantee.
  • the size of the control channel region for the UE / terminal-group may be set to L1 / L2 signaling such as RRC (Radio Resource Control) or common / group common control signal.
  • the downlink control channel may be classified into localized mapping and distributed mapping according to resource mapping, and different transmission schemes may be applied to each mapping. Accordingly, the base station and the terminal may have different DMRS configuration information according to each transmission scheme.
  • the 5G wireless communication system may support a variety of services having different requirements, the requirements for the downlink control channel may be different. For example, different DMRS configuration information or a corresponding transmission scheme may be applied to each terminal to support a service requiring higher reliability. Accordingly, the present invention provides a method for configuring DMRS in various downlink control channel transmission environments, and provides a base station and a terminal operation according thereto.
  • LTE and 5G system will be the main target, but the main subject of the present invention greatly extends the scope of the present invention to other communication systems having a similar technical background and channel form. Applicable in a few variations without departing from the scope, which will be possible in the judgment of those skilled in the art.
  • 2E is a diagram illustrating a DMRS setting method of a downlink control channel according to the first embodiment of the present invention.
  • FIG. 2E one NR-REG (2e-04) is shown, and an example of transmitting DMRSs 2e-01 and 2e-02 corresponding to two antenna ports is shown.
  • a DMRS corresponding to each antenna port is mapped to each UE in a UE-specific manner.
  • the DMRS port configuration information of the downlink control channel can be blindly decoded when the terminal can be implicitly instructed from information that is already promised or known. For example, the NR-REG index, NR-CCE index, OFDM symbol index, slot or subframe index, the total number of NR-REGs present in the control resource set, and the total NR- present in the control resource set, are searched for during blind decoding.
  • Cell-specific (or UE group common) configuration for DMRS port configuration cell identity (ID) or virtual cell ID information may be additionally considered, and UE-specific configuration may be considered.
  • Terminal ID eg, RNTI
  • This can be expressed as [Equation 1] as follows.
  • Antenna port number f (downlink control channel configuration information, terminal or cell identifier)
  • Equation 1 f (x, y) means a function for the variables x and y, which can be expressed by various equations.
  • the DMRS 2e-01 corresponding to the antenna port # 0 may be allocated to the terminal # 1 (2e-05), and the DMRS (2e-07) corresponding to the antenna port # 1 may be the terminal #. 2 (2e-06).
  • DMRSs 2e-01 and 2e-02 corresponding to antenna port # 0 and antenna port # 1 may be allocated to terminal # 3 (2e-07). This can be calculated using the above [Formula 1].
  • DMRS antenna ports of respective terminals may be mapped orthogonal or non-orthogonal. In the case of non-orthogonal mapping, interference may be randomized using a UE-specific DMRS sequence.
  • 2F shows an example of a DMRS pattern according to an embodiment of the present invention.
  • FIG. 2F one NR-REG (2f-30) is shown, and an example of transmitting DMRSs 2f-01 and 2f-02 corresponding to two antenna ports is shown. Also, an example in which UEs receive DMRSs corresponding to one antenna port is set.
  • 1 port transmission may be performed.
  • a transmission diversity transmission method such as precoder cycling is used in a distributed method
  • 1 port transmission may be performed.
  • UE # 1 (2f-10) is mapped to antenna port # 0 (2f-01)
  • UE # 2 (2f-20) shows an example of mapping to antenna port # 1 (2f-02).
  • Antenna port mapping may be set in the same manner as in the first embodiment described above. In the following embodiment of the present invention, it is considered that different DMRS patterns may be set in the same DMRS antenna port mapping.
  • 2F shows basic DMRS patterns # 1 (2f-04) and DMRS patterns # 2 (2f-05, 2f-06) having different DMRS overheads, respectively.
  • DMRS Pattern # 1 (2f-04) is a DMRS (2f-01) corresponding to antenna port # 0 assigned to UE # 1 according to antenna port mapping in the basic DMRS pattern of NR-REG (2f-30) Shows.
  • the DMRS of another terminal (for example, the terminal # 2 (2f-20) in FIG. 2F) may be transmitted. Do not use (2f-03).
  • the DMRS (2f-02) position corresponding to the antenna port # 1 that is, the RE corresponding to 2f-03 may be used for DMRS transmission or DCI transmission. More specifically, in the DMRS pattern # 2-1 (2f-05), the RE (2f-03) which is not used in the DMRS pattern # 1 (2f-04) is the DMRS (2f-01) for the antenna port # 0. Can be used to send additional.
  • the DMRS pattern # 2-1 (2f-05) may have a higher DMRS density along the frequency axis than the DMRS pattern # 1 (2f-04), so that channel estimation performance may be better.
  • DMRS pattern # 2-2 (2f-06) it may be used as an additional RE for transmitting DCI to unused RE (2f-03) of DMRS pattern # 1 (2f-04).
  • the DMRS pattern # 2-2 (2f-06) can transmit at a lower code rate than the DMRS pattern # 1 (2f-04).
  • DMRS patterns that may have better performance than DMRS pattern # 1 (2f-04) may be defined in various ways.
  • the RE (2f-03) not used in the DMRS pattern # 1 additionally transmits the DMRS (2f-01) for the antenna port # 1 (DMRS pattern # 2- 1) or DCI transmission (DMRS # 2-2).
  • the terminal may implicitly know the DMRS antenna port information through the first embodiment of the present invention, and may receive a DMRS pattern for the corresponding port.
  • DMRS pattern # 1 is described as a first DMRS pattern and DMRS pattern # 2 as a second DMRS pattern.
  • 2ga and 2gb illustrate a DMRS setting method according to a second embodiment of the present invention.
  • a DMRS pattern may be set implicitly based on service type information. For example, a DMRS pattern may be set whether or not URLLC data is transmitted as shown in FIGS. 2G and 2GB. In downlink control channel transmission for URLLC, much higher reliability may be required than eMBB. As a method for increasing the reliability of the downlink control channel, a high aggregation level or a transmit diversity transmission scheme may be used. In addition, additional performance improvement can be expected by increasing the channel estimation performance through DMRS pattern setting. For example, the second DMRS pattern may be used for URLLC transmission.
  • the downlink control channel is less likely to be multiplexed with another user, for example, MU-MIMO transmission, it is preferable that one terminal uses all DMRSs transmitted through the corresponding NR-REG.
  • the UE may implicitly obtain DMRS pattern setting information from whether to transmit URLLC.
  • the base station determines whether to transmit URLLC in step 2g-01. When the base station does not transmit the URLLC, the base station transmits the first DMRS pattern in step 2g-02. The base station transmits the second DMRS pattern in step 2g-03 during URLLC transmission.
  • the terminal may calculate the DMRS port number in step 2g-11 through the first embodiment of the present invention.
  • the terminal may implicitly set the DMRS pattern for the obtained DMRS port.
  • the terminal determines whether to transmit URLLC in step 2g-12. When the terminal does not transmit the URLLC, the terminal assumes the first DMRS pattern in step 2g-13 and receives it. The UE assumes the second DMRS pattern and receives it in step 2g-14 during URLLC transmission.
  • the terminal may perform channel estimation on the downlink control channel based on the DMRS information configured in step 2g-15.
  • 2ha and 2hb are diagrams illustrating a DMRS setting method according to a third embodiment of the present invention.
  • a DMRS pattern may be set implicitly according to an aggregation level. For example, a terminal with poor reception signal quality may be transmitted with a downlink control channel at a high aggregation level. In this case, higher channel estimation quality may be required.
  • a downlink control channel of a terminal having a high aggregation level is less likely to be multiplexed with a downlink control channel of another terminal, for example, MU-MIMO transmission, one terminal uses all DMRSs transmitted to the corresponding NR-REG. It may be desirable to. Accordingly, in the case of a high aggregation level, the second DMRS pattern may be used, and the UE may perform channel estimation by assuming different DMRS patterns according to aggregation levels when blind decoding.
  • the base station determines whether the aggregation level of the downlink control channel transmitted in step 2h-01 exceeds a specific threshold, for example, L. If the aggregation level is less than L, the base station transmits the first DMRS pattern in step 2h-02. If the aggregation level is greater than L, the second DMRS pattern is transmitted in step 2h-03.
  • a specific threshold for example, L.
  • the terminal may calculate the DMRS port number in step 2h-11 through the first embodiment of the present invention.
  • the terminal may implicitly set the DMRS pattern for the obtained DMRS port.
  • the UE may compare the aggregation level with respect to the corresponding downlink control channel candidate group and a specific threshold value, for example, L, in the process of performing blind decoding in step 2h-12. If the aggregation level is less than L, the terminal assumes the first DMRS pattern in step 2h-13 and receives it. If the aggregation level is greater than L, the second DMRS pattern is assumed and received in step 2h-14.
  • the UE may perform channel estimation on the downlink control channel based on the DMRS information configured in step 2h-15.
  • FIGS. 2A and 2B illustrate a method of establishing a DMRS according to a fourth embodiment of the present invention.
  • a DMRS pattern may be implicitly set according to the number of OFDM symbols set as a control resource set.
  • the control resource set which is the entire resource region in which the downlink control channel is transmitted, may vary depending on the capacity of the downlink control signal that the base station should transmit.
  • the time resources constituting the control resource set that is, the number of symbols may vary. For example, when the number of terminals receiving the downlink control signal is small, by setting the control resource set to a small number of OFDM symbols, for example, one OFDM symbol, it is possible to use resources more efficiently.
  • the terminal may use the second DMRS pattern according to the number of OFDM symbols of the control resource set.
  • step 2i-01 the base station determines whether the number of OFDM symbols of the control resource set to which the downlink control channel is transmitted exceeds a specific threshold, for example, K. If the number of OFDM symbols in the control resource set is greater than K, the base station transmits the first DMRS pattern in step 2i-02. If the number of OFDM symbols of the control resource set is smaller than K, the second DMRS pattern is transmitted in steps 2i-03.
  • K a specific threshold
  • the terminal may calculate the DMRS port number in step 2i-11 through the first embodiment of the present invention.
  • the terminal may implicitly set the DMRS pattern for the obtained DMRS port.
  • the UE determines whether the number of OFDM symbols of the control resource set through which the downlink control channel is transmitted exceeds a specific threshold value, for example, K. If the number of OFDM symbols of the control resource set is greater than K, the UE transmits the first DMRS pattern in steps 2i-13. If the number of OFDM symbols of the control resource set is smaller than K, the second DMRS pattern is transmitted in steps 2i-14.
  • the terminal may perform channel estimation on the downlink control channel based on the DMRS information configured in step 2i-15.
  • 2ja and 2jb illustrate a DMRS setting method according to a fifth embodiment of the present invention.
  • the 5G downlink control channel may be configured with a common control channel (common control channel or group-common control channel) and a UE-specific control channel (UE-specific control channel).
  • the DMRS may be configured cell-specifically, which may be configured by using a predetermined configuration or by using a MIB.
  • the DMRS of the UE-specific control channel may be configured UE-specifically, and an indicator for this may be transmitted from the common control channel.
  • the terminal may decode the common control channel first before decoding the terminal-specific control channel, and receives an indicator for the DMRS pattern of the terminal-specific control channel from the DCI of the common control channel. can do.
  • the UE may calculate DMRS port configuration information as a first embodiment of the present invention and may receive information on a DMRS pattern for a corresponding DMRS port from a common control channel.
  • the base station generates a DMRS pattern indicator for the downlink control channel in step 2j-01.
  • the base station transmits a DMRS pattern indicator to the common control channel in step 2j-02.
  • the terminal may calculate the DMRS port number in step 2j-11 through the first embodiment of the present invention.
  • the UE may decode the common control channel in step 2j-12, and may obtain a DMRS pattern indicator therefrom.
  • the terminal receives the DMRS in the DMRS pattern set through the DMRS pattern indicator obtained in steps 2j-13.
  • the UE may perform channel estimation on the UE-specific control channel based on the DMRS pattern obtained in step 2j-14.
  • 2ka and 2kb are diagrams illustrating a DMRS setting method according to a sixth embodiment of the present invention.
  • the 5G downlink control channel may be configured as a two-stage control channel of the first control channel and the second control channel.
  • the first control channel and the second control channel may transmit DCI independent of each other. For example, some fields of the entire DCI may be transmitted on the first control channel, and the remaining fields except for the DCI field transmitted on the first control channel may be transmitted on the second control channel.
  • Both the first control channel and the second control channel may be transmitted in a control resource set.
  • the first control channel may be transmitted in the control resource set, and the second control channel may be transmitted in the data transmission area.
  • Both the first control channel and the second control channel may be terminal-specific control channels.
  • the terminal may decode the first control channel first, and then decode the second control channel. Accordingly, the base station may transmit a DMRS pattern setting indicator for the second control channel to the first control channel. At this time, the DMRS pattern of the first control channel should use a predetermined pattern.
  • the base station generates a DMRS pattern indicator for the downlink control channel in step 2k-01.
  • the base station transmits a DMRS pattern indicator to the first control channel in step 2k-02.
  • the terminal may calculate the DMRS port number in step 2k-11 through the first embodiment of the present invention.
  • the terminal may decode the first control channel in step 2k-12 and obtain a DMRS pattern indicator therefrom.
  • the terminal receives the DMRS in the DMRS pattern set through the DMRS pattern indicator obtained in steps 2k-13.
  • the terminal may perform channel estimation on the second control channel based on the DMRS pattern obtained in step 2k-14.
  • FIGS. 2L and 2M a transmitter, a receiver, and a controller of a terminal and a base station are illustrated in FIGS. 2L and 2M, respectively.
  • the transmitter, the receiver, and the processor of the base station and the terminal must operate according to the embodiments.
  • FIG. 2L is a block diagram illustrating an internal structure of a terminal according to an exemplary embodiment of the present invention.
  • the terminal of the present invention may include a terminal processor 2l-01, a receiver 2l-02, and a transmitter 2l-03.
  • the terminal processor 211-01 may control a series of processes in which the terminal may operate according to the above-described embodiment of the present invention.
  • the downlink control channel decoding operation of the UE may be controlled differently according to DMRS port configuration, DMRS pattern configuration information, etc. according to an embodiment of the present invention.
  • the terminal receiver 2l-02 and the terminal may collectively be referred to as a transmitter / receiver in the embodiment of the present invention.
  • the transceiver may transmit and receive a signal with the base station.
  • the signal may include control information and data.
  • the transmission and reception unit may be composed of an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low noise amplifying and down-converting the received signal.
  • the transceiver may receive a signal through a wireless channel, output the signal to the terminal processor 211-01, and transmit a signal output from the terminal processor 2l-01 through a wireless channel.
  • the base station of the present invention may include a base station processor 2m-01, a receiver 2m-02, and a transmitter 2m-03.
  • the base station processor 2m-01 may control a series of processes such that the base station can operate according to the above-described embodiment of the present invention. For example, it is possible to control the downlink control channel resource allocation, the transmission scheme, etc. of the terminal according to the DMRS port configuration, DMRS pattern configuration information, etc. according to an embodiment of the present invention. In addition, it may be controlled to transmit an additional indicator for the DMRS pattern information as needed.
  • the base station receiver 2m-02 and the base station transmitter 2m-03 may be collectively referred to as a transceiver in the embodiment of the present invention. The transceiver may transmit and receive a signal with the terminal. The signal may include control information and data.
  • the transmission and reception unit may be composed of an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low noise amplifying and down-converting the received signal.
  • the transceiver may receive a signal through a wireless channel, output the signal to the base station processor 2m-01, and transmit a signal output from the base station processor 2m-01 through the wireless channel.

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

Abstract

La présente invention concerne : une technique de communication pour fusionner, avec une technologie IdO, un système de communication 5G apte à prendre en charge un débit de transmission de données supérieur à celui d'un système 4G ; et un système associé. La présente invention peut être appliquée à des services intelligents (par exemple, une maison intelligente, un bâtiment intelligent, une ville intelligente, une voiture intelligente ou une voiture connectée, des soins de santé, l'enseignement numérique, le commerce de détail, les services liés à la sécurité et à la sûreté, et analogues) sur la base d'une technologie de communication 5G et d'une technologie associée à l'IdO. La présente invention concerne un procédé par lequel une station de base transmet un DM-RS dans un système de communication mobile sans fil prenant en charge un premier intervalle de temps de transmission (TTI) et un second TTI. Le procédé comprend les étapes consistant à : vérifier un TTI utilisé dans une transmission de canal de commande de liaison descendante ; déterminer, en tant qu'un premier motif, un DM-RS pour le canal de commande de liaison descendante si le TTI est le premier TTI et déterminer, en tant qu'un second motif, un DM-RS pour le canal de commande de liaison descendante si le TTI est le second TTI ; et transmettre, au terminal, le canal de commande de liaison descendante et le DM-RS selon la détermination.
PCT/KR2018/002488 2017-02-28 2018-02-28 Procédé et dispositif de transmission de dm-rs dans un système de communication sans fil Ceased WO2018160015A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US16/489,661 US11057176B2 (en) 2017-02-28 2018-02-28 DM-RS transmission method and device in wireless mobile communication system
EP18761578.6A EP3576332B1 (fr) 2017-02-28 2018-02-28 Procédé et dispositif de transmission de dm-rs dans un système de communication sans fil

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2017-0026570 2017-02-28
KR20170026570 2017-02-28
KR10-2017-0036945 2017-03-23
KR1020170036945A KR102383906B1 (ko) 2017-02-28 2017-03-23 무선 셀룰라 통신 시스템에서 제어 및 데이터 신호의 사용자 구분 방법 및 장치

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CN114451047A (zh) * 2019-08-01 2022-05-06 三星电子株式会社 无线通信系统中的旁路资源确定、旁路信号发送和接收方法及装置

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