WO2018062961A1 - Procédé et dispositif pour transmettre des signaux de commande en liaison montante et de données dans un système de communication cellulaire sans fil - Google Patents

Procédé et dispositif pour transmettre des signaux de commande en liaison montante et de données dans un système de communication cellulaire sans fil Download PDF

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WO2018062961A1
WO2018062961A1 PCT/KR2017/011028 KR2017011028W WO2018062961A1 WO 2018062961 A1 WO2018062961 A1 WO 2018062961A1 KR 2017011028 W KR2017011028 W KR 2017011028W WO 2018062961 A1 WO2018062961 A1 WO 2018062961A1
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Prior art keywords
terminal
transmission
signal
base station
transmitted
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PCT/KR2017/011028
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English (en)
Korean (ko)
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여정호
오진영
박성진
가희돈
배태한
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삼성전자 주식회사
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Priority claimed from KR1020170036877A external-priority patent/KR102288064B1/ko
Application filed by 삼성전자 주식회사 filed Critical 삼성전자 주식회사
Publication of WO2018062961A1 publication Critical patent/WO2018062961A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a wireless communication system and to a method and apparatus for transmitting an uplink control signal or a data signal. More specifically, the present invention relates to a transmission method in a terminal capable of uplink transmission at one or more timings for downlink data signal transmission or scheduling.
  • 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.
  • Hybrid FSK and QAM Modulation FQAM
  • SWSC Slide Window Superposition Coding
  • ACM Advanced Coding Modulation
  • FBMC Fan Bank Multi Carrier
  • NOMA non orthogonal multiple access
  • SCMA sparse code multiple access
  • the Internet is evolving from a human-centered connection network where humans create and consume information, and an Internet of Things (IoT) network that exchanges and processes information among distributed components such as things.
  • IoT Internet of Things
  • IoE Internet of Everything
  • sensing technology In order to implement the IoT, technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between things, a machine to machine , M2M), Machine Type Communication (MTC), etc. are being studied.
  • M2M Machine to machine
  • MTC Machine Type Communication
  • IoT Internet technology
  • 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.
  • PDSCH physical downlink shared channel
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • the HARQ ACK / NACK transmission timing or the PUSCH transmission timing is set to an uplink-downlink subframe. Depends on the predetermined rules.
  • the HARQ ACK / NACK transmission timing or the PUSCH transmission timing are predetermined timings when the time required for signal processing between the base station and the terminal is about 3 ms. However, if the LTE base station and the terminal reduces the signal processing time by about 1ms or 2ms may reduce the delay time for data transmission.
  • Another object of the present invention is to provide a method for transmitting a reference signal and a method for setting whether or not to transmit a reference signal or transmitting information.
  • Still another object of the present invention is to provide a method and apparatus for simultaneously providing different types of services. More specifically, the embodiment of the present disclosure to efficiently provide different types of services within the same time period by acquiring information received according to the characteristics of each service when simultaneously providing different types of services. It is an object of the present invention to provide a method and apparatus.
  • the terminal method in a wireless communication system the step of receiving the configuration information for setting the transmission time interval (TTI) corresponding to three or less symbols from the base station Receiving, from the base station, indication information indicating a position of a symbol on which an uplink reference signal associated with a specific TTI according to the configuration is transmitted; and transmitting an uplink signal from the specific TTI to the base station based on the indication information. It may include the step of transmitting.
  • TTI transmission time interval
  • the transmission and reception unit for transmitting the setting information for setting the terminal to the transmission time interval (TTI) corresponding to three or less symbols;
  • Control the transceiver to transmit indication information indicating a position of a symbol on which the uplink reference signal associated with a specific TTI according to the configuration is transmitted to the terminal and receive an uplink signal from the specific TTI based on the indication information. It may include a control unit.
  • the transmission and reception unit for receiving the setting information for setting the transmission time interval (TTI) corresponding to three or less symbols from the base station And receiving, from the base station, indication information indicating a position of a symbol on which an uplink reference signal associated with a specific TTI according to the configuration is transmitted, and transmitting an uplink signal to the base station in the specific TTI based on the indication information. It may include a control unit for controlling the transceiver to.
  • a method of a terminal in a wireless communication system including receiving information about a transmission timing of a second signal corresponding to a first signal from a base station, and receiving a third signal from the base station.
  • Receiving receiving the first signal from the base station after the third signal is received and if the transmission timing of the fourth signal corresponding to the third signal is determined to be the same as the transmission timing of the second signal And transmitting at least one of the second signal and the fourth signal to the base station at the transmission timing.
  • the transmission timing of the fourth signal and the transmission of the second signal can be determined to be the same.
  • the method of the base station in the wireless communication system transmitting information on the transmission timing of the second signal corresponding to the first signal to the terminal, to the terminal, Transmitting a third signal, transmitting the first signal after transmitting the third signal to the terminal, and from the terminal, at least a fourth signal corresponding to the second signal and the third signal And receiving one, wherein the second signal and the fourth signal may be determined by the terminal to have the same transmission timing.
  • the base station method in the wireless communication system may transmit the third signal to the terminal in the common search region of the physical control channel.
  • a terminal in a wireless communication system a base station, a transceiver for receiving information on the transmission timing of the second signal corresponding to the first signal, and receives a third signal from the base station And when the first signal is received from the base station after the third signal is received and the transmission timing of the fourth signal corresponding to the third signal is equal to the transmission timing of the second signal, the transmission timing And a control unit controlling the transceiver to transmit at least one of the second signal and the fourth signal to the base station.
  • the controller when the third signal is received in a common search area of a physical control channel, the controller may further include the transmission timing of the fourth signal and the second signal.
  • the transmission timing can be determined to be the same.
  • the controller may control the transceiver to transmit the third signal to the terminal in the common search region of the physical control channel.
  • configuration information for first type uplink transmission of a first terminal and first configuration parameter for accessing a specific channel of the first terminal Transmitting information and transmitting configuration information for the second type uplink transmission of the second terminal and second configuration parameter information for the connection to the specific channel to the second terminal.
  • the priority of the connection of the first terminal to the specific channel may be set higher than the priority of the connection of the second terminal.
  • the base station method in a wireless communication system may further include transmitting scheduling information regarding the first type of uplink transmission to the first terminal.
  • each of the first configuration parameter information and the second configuration parameter information, the threshold value for the signal strength detected for the particular channel And a measurement time of the signal strength associated with the threshold value.
  • a base station in a wireless communication system according to another embodiment of the present invention, includes configuration information for first type uplink transmission of a first terminal and first configuration parameter information for accessing a specific channel of the first terminal.
  • For the transmission and reception unit for transmitting the configuration information for the second type uplink transmission of the second terminal and the second configuration parameter information for accessing the specific channel to the second terminal and the specific channel,
  • a controller configured to set the first configuration parameter information and the second configuration parameter information such that a priority of the connection of the first terminal is higher than a priority of the connection of the second terminal.
  • each of the first configuration parameter information and the second configuration parameter information, the threshold value for the signal strength detected for the particular channel and It may include at least one of the measurement time of the signal strength associated with the threshold value.
  • the first configuration parameter information includes a first threshold value for the reception strength of the signal in the specific channel
  • the second configuration The parameter information may include a second threshold value smaller than the first threshold value
  • the delay time can be reduced during uplink and downlink data transmission by providing a method for operating a delay reduction mode of a base station and a terminal.
  • 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.
  • 1F is a diagram illustrating the operation of a base station and a terminal according to embodiment 1-1.
  • Fig. 1G is a diagram showing the timing in the embodiment 1-2.
  • 1H is a block diagram illustrating a structure of a terminal according to embodiments.
  • 2A is a diagram illustrating a downlink time-frequency domain transmission structure of a conventional LTE or LTE-A system.
  • 2c is a diagram illustrating transmission and reception timing of a first signal and a second signal of a base station and a terminal when a transmission delay time is 0 in an LTE or LTE-A system according to the prior art.
  • 2E is a diagram illustrating transmission and reception timing of a first signal and a second signal of a base station and a terminal when a propagation delay time is greater than 0 and timing advance is applied in the LTE or LTE-A system according to the prior art.
  • FIG. 2F is a diagram illustrating an example of using two-symbol TTI and RS in uplink according to embodiment 2-1 of the present invention.
  • 2G is a diagram illustrating an example of using two-symbol TTI and RS in uplink according to embodiment 2-1 of the present invention.
  • 2H is a diagram illustrating an example of using two-symbol TTI and RS in uplink according to embodiment 2-1 of the present invention.
  • 2i is a block diagram illustrating an internal structure of a terminal according to embodiments of the present invention.
  • 2J is a block diagram illustrating an internal structure of a base station according to embodiments of the present invention.
  • FIG. 2K illustrates a structure of shortened-TTI having two symbols or three symbols included in one subframe in TTI units in uplink transmission according to an embodiment of the present invention.
  • FIG. 3a 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 or a similar system.
  • 3b is a diagram illustrating 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.
  • FIG. 3C is a diagram showing how data for eMBB, URLLC, and mMTC, which are services considered in a 5G or NR system, are allocated in frequency-time resources.
  • FIG. 3D is a diagram illustrating data for eMBB, URLLC, and mMTC, which are services considered in a 5G or NR system, are orthogonally allocated in frequency-time resources.
  • 3E illustrates a time and frequency resource region in which a UE can perform grant-free uplink transmission.
  • 3F is a diagram illustrating an operation of a base station according to an embodiment of the present invention.
  • 3G is a diagram illustrating a terminal operation according to an embodiment of the present invention.
  • 3H is a block diagram illustrating a structure of a terminal according to an embodiment.
  • 3I is a block diagram illustrating a structure of a terminal according to an embodiment.
  • 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 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 Slide Window Superposition Coding
  • ACM Advanced Coding Modulation
  • FBMC Fan Bank Multi Carrier
  • NOMA Non-orthogonal multiple access and sparse code multiple access are being developed.
  • the Internet is evolving from a human-centered connection network in which humans generate and consume information, and an Internet of Things (IoT) network that exchanges and processes information between distributed components such as things.
  • IoT Internet of Things
  • IoE Internet of Everything
  • sensing technology In order to implement the IoT, technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between things, a machine to machine , M2M), Machine Type Communication (MTC), etc. are being studied.
  • M2M Machine to machine
  • MTC Machine Type Communication
  • IoT Internet technology
  • 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.
  • 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. .
  • 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.
  • ⁇ unit 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.
  • At least one service of Enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (mMTTC), and Ultra-Reliable and Low-latency Communications (URLLC) may be provided to a terminal in a wireless communication system including a fifth generation.
  • the services may be provided to the same terminal during the same time period.
  • the eMBB may be a high speed data transmission
  • the mMTC may be a service aimed at minimizing the terminal power and accessing multiple terminals
  • the URLLC may be a high reliability and a low latency.
  • the three services may be major scenarios in an LTE system or a system such as 5G / NR (new radio, next radio) after LTE.
  • 5G / NR new radio, next radio
  • the base station is a subject performing resource allocation of the terminal, and may be at least one of an eNode B, a Node B, a base station (BS), 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.
  • DL downlink
  • UL uplink
  • 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.
  • the uplink refers to a radio link through which a terminal or user equipment (UE) or a mobile station (MS) transmits data or control signals to an eNode B or a base station (BS), and the downlink refers to a base station
  • the above-described multiple access scheme is generally designed such that orthogonality does not overlap the time-frequency resources for carrying data or control information for each user. By establishing and assigning, data or control information of each user can be distinguished.
  • 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).
  • a resource block 1a08 (Resource Block; RB or PRB) may be defined as N symb (1a02) consecutive OFDM symbols in the time domain and N RB (1a10) consecutive subcarriers in the frequency domain. Accordingly, one RB 1a08 in one slot may include N symb x N RB REs 1a12.
  • the frequency-domain minimum allocation unit of data is the RB.
  • 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.
  • 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 that is data to be transmitted.
  • New data indicator indicates whether HARQ initial transmission or retransmission.
  • the DCI is scrambled with a specific Radio Network Temporary Identifier (RNTI) (or UE identifier) independently for each UE, and a cyclic redundancy check (CRC) is added to the UE and channel coded.
  • RNTI Radio Network Temporary Identifier
  • CRC cyclic redundancy check
  • each independent PDCCH is configured and transmitted.
  • the PDCCH is mapped and transmitted during the control channel transmission period.
  • the frequency domain mapping position of the PDCCH is determined by an identifier (ID) of each terminal, and can be transmitted by being spread over the entire system transmission band.
  • ID identifier
  • 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 the size before channel coding for error correction is applied to data (TB) to be transmitted by the base station.
  • 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 1b02, and N symb UL SC-FDMA symbols may be collected to form one slot 1b06. Two slots are gathered to form one subframe 1b05.
  • the minimum transmission unit in the frequency domain is a subcarrier, and the total system transmission bandwidth 1b04 consists of a total of N BW subcarriers. N BW may have a value proportional to the system transmission band.
  • the basic unit of a resource in the time-frequency domain may be defined as a SC-FDMA symbol index and a subcarrier index as a resource element (RE, 1b12).
  • the resource block pair 1b08 (Rb pair) may be defined as N symb UL contiguous SC-FDMA symbols in the time domain and N sc RB contiguous subcarriers in the frequency domain. Therefore, one RB is composed of N symb UL x N sc RB Rs .
  • the minimum transmission unit for data or control information is in RB units. In the case of PUCCH, it 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 can be 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. Can be 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 may buffer the data determined to be an error as a result of decoding the received data for the HARQ operation, and then perform combining with the next retransmission data.
  • HARQ ACK / NACK information of the PDSCH transmitted in the subframe nk is transmitted from the UE to the base station through the PUCCH or the PUSCH in the subframe n, where k is the FDD or time division duplex (TDD) of the LTE system and its subframe. It can be defined differently according to the setting. For example, in the case of the FDD LTE system, k is fixed to 4.
  • k may be changed according to the subframe configuration and the subframe number.
  • the value of k may be differently applied according to the TDD setting of each carrier when transmitting data through a plurality of carriers.
  • the k value is determined according to the TDD UL / DL configuration as shown in Table 1b below.
  • the uplink HARQ adopts a synchronous HARQ scheme with a fixed data transmission time point. That is, a Physical Hybrid (Physical Uplink Shared Channel), which is a physical channel for transmitting uplink data, a PDCCH, which is a preceding downlink control channel, and a PHICH (Physical Hybrid), which is a physical channel through which downlink HARQ ACK / NACK corresponding to the PUSCH is transmitted.
  • the uplink / downlink timing relationship of the indicator channel may be transmitted and received by the following rule.
  • k may be defined differently according to FDD or time division duplex (TDD) of LTE system and its configuration. For example, in the case of an FDD LTE system, k may be fixed to four.
  • k may be changed according to the subframe configuration and the subframe number.
  • the value of k may be differently applied according to the TDD setting of each carrier when transmitting data through a plurality of carriers.
  • the k value is determined according to the TDD UL / DL configuration as shown in Table 1c below.
  • HARQ-ACK information of the PHICH transmitted in subframe i is related to the PUSCH transmitted in subframe i-k.
  • k is given by 4. That is, HARQ-ACK information of the PHICH transmitted in subframe i in the FDD system is related to the PUSCH transmitted in subframe i-4.
  • EIMTA Enhanced Interference Management Traffic Adaptation
  • the k value can be given according to the following [Table 1d].
  • the PHICH transmitted in subframe 6 may be HARQ-ACK information of the PUSCH transmitted in subframe 2 that is 4 subframes before.
  • the description of the wireless communication system has been described with reference to the LTE system, and the present invention is not limited to the LTE system but can be applied to various wireless communication systems such as NR and 5G.
  • the k value when applied to another wireless communication system, the k value may be changed and applied to a system using a modulation scheme corresponding to FDD.
  • 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 1c00.
  • URLLC data (1c03, 1c05, 1c07) occurs during transmission while the eMBB (1c01) and the mMTC (1c09) are allocated and transmitted in a specific frequency band, the portion where the eMBB (1c01) and the mMTC (1c09) have already been allocated.
  • URLLC data (1c03, 1c05, 1c07) can be transmitted without emptying or transmitting.
  • URLLC data may be allocated 1c03, 1c05, and 1c07 to a portion of the resource 1c01 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 1d00 may be divided and used to transmit a service and data in each subband 1d02, 1d04, and 1d06.
  • 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.
  • the subband 1d02 is used for eMBB data transmission
  • the subband 404 is URLLC data transmission
  • the subband 1d06 is used for 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 transmitted 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 the uplink or the downlink may be added with a CRC 1e03 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 1e01 and 1e03 to which the TB and the CRC are added may be divided into a plurality of codeblocks CBs 1e07, 1e09, 1e11, and 1e13 (1e05).
  • the code block may be divided by a predetermined maximum size.
  • the last code block 1e13 may be smaller in size than other code blocks, or may have a length equal to that of other code blocks by adding 0, a random value, or 1. I can match it.
  • CRCs 1e17, 1e19, 1e21, and 1e23 may be added to the divided code blocks, respectively (1e15).
  • 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 CRC 1e03 added to the TB and the CRCs 1e17, 1e19, 1e21, and 1e23 added to the code block may be omitted depending on the type of channel code to be applied to the code block. For example, if a Low Density Parity Check (LDPC) code is applied to the code block instead of the turbo code, the CRCs 1e17, 1e19, 1e21, and 1e23 to be inserted for each codeblock may be omitted. However, even when the LDPC is applied, the CRCs 1e17, 1e19, 1e21, and 1e23 may be added to the code block as it is. In addition, CRC may be added or omitted even when a polar code is used.
  • LDPC Low Density Parity Check
  • 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.
  • URLLC service is called a 2nd type service, and URLLC data is called 2nd 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.
  • At least one of a PHICH, an uplink scheduling grant signal, and a downlink data signal is referred to as a first signal.
  • at least one of an uplink data signal for the uplink scheduling grant and a HARQ ACK / NACK for the downlink data signal is called a second signal.
  • a signal is expected from the terminal among the signals transmitted from the base station to 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 be at least one of eMBB, URLLC, and mMTC
  • the second signal may also correspond to at least one of the services.
  • PUCCH format 0 or 4 and PHICH may be a first signal
  • a second signal corresponding thereto may be a PUSCH.
  • a PDSCH may be a first signal
  • a PUCCH or PUSCH including HARQ ACK / NACK information of the PDSCH may be a second signal.
  • a PDCCH / EPDCCH including an aperiodic CSI trigger may be a first signal
  • a corresponding second signal may be a PUSCH including channel measurement information.
  • the base station informs the terminal when to transmit the second signal Is the same as telling k.
  • the base station to inform the terminal of the timing to transmit the second signal is offset Equivalent to giving the value a.
  • the offset may be defined by various methods such as n + 3 + a and n + 5 + a instead of n + 4 + a, and the n + 4 + a value referred to in the present invention below may also be offset in various ways. It can be defined.
  • the contents of the present invention will be described based on the FDD LTE system, but can be applied to a TDD system and an NR system.
  • the 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 radio resource control (RRC).
  • RRC radio resource control
  • Signaling, or Packet Data Convergence Protocol (PDCP) signaling, or Medium Access Control (MAC) control element (MAC CE) may be referred to.
  • PDCP Packet Data Convergence Protocol
  • MAC CE Medium Access Control
  • the method for transmitting the second signal may be possible in various ways. For example, after the UE receives the downlink data PDSCH, the timing of transmitting HARQ ACK / NACK information corresponding to the PDSCH to the base station is the method described in the present invention, but the PUCCH format selected, the PUCCH resource selection or The method of mapping HARQ ACK / NACK information to the PUSCH may follow the conventional LTE method.
  • a normal mode is a mode using a first signal and a second signal transmission timing used in conventional LTE and LTE-A systems, and in the normal mode, signal processing of about 3 ms including TA. It is possible to secure time.
  • the second signal for the first signal received by the terminal in subframe n is transmitted by the terminal in subframe n + 4.
  • the transmission may be referred to as n + 4 timing transmission. If the second signal for the first signal transmitted in subframe n + k is scheduled to be transmitted at n + 4 timing, the second signal means that the second signal is transmitted in subframe n + k + 4.
  • the delay reduction mode is a mode that enables the transmission timing of the second signal with respect to the first signal to be faster or equal to that of the normal mode, and can reduce the delay time.
  • timing can be controlled in various ways.
  • the delay reduction mode may be used in combination with a reduced processing time mode.
  • the delay reduction mode may be set to a terminal that supports the delay reduction mode through higher signaling.
  • a second signal for the first signal transmitted in subframe n may be transmitted before subframe n + 4.
  • the terminal in which the delay reduction mode is set may transmit a second signal for the first signal transmitted in subframe n in subframe n + 3.
  • the transmission may be referred to as n + 3 timing transmission. If the second signal for the first signal transmitted in subframe n + 1 is scheduled to be transmitted at n + 3 timing, the second signal is transmitted in subframe n + 4.
  • a second signal for a first signal transmitted in subframe n + 2 is scheduled to be transmitted at an n + 3 timing, it means that the second signal is transmitted in subframe n + 5. That is, if the second signal for the first signal transmitted in subframe n + k is scheduled to be transmitted at n + 3 timing, the second signal means that the second signal is transmitted in subframe n + k + 3.
  • the second signal when the first signal is a PDSCH, the second signal may be a PUCCH or a PUSCH including HARQ-ACK information of the PDSCH.
  • the first signal when the first signal is a PDCCH or EPDCCH including PHICH or uplink scheduling information, the second signal may be a PUSCH for the uplink scheduling.
  • the first signal when the first signal is a PDCCH / EPDCCH including an aperiodic CSI trigger, the second signal may be a PUSCH including channel measurement information.
  • Embodiment 1-1 provides a method in which a second signal is always transmitted at a predetermined timing regardless of the delay reduction mode setting of the base station. This embodiment will be described with reference to FIG. 1F.
  • the base station When the delay reduction mode is set to the upper signaling to the terminal, the base station is uncertain when the upper signaling is delivered to the terminal, so a method of always allowing the second signal to be delivered at a predetermined timing regardless of the setting of the base station may be necessary. have.
  • n + 4 timing transmission may be required regardless of the delay reduction mode setting.
  • a method of performing n + 4 timing transmission regardless of the delay reduction mode setting may be used interchangeably with the term 'fall-back mode transmission'. Accordingly, when the fallback mode transmission is performed, the base station considers that the second signal is transmitted at the n + 4 timing instead of the n + 3 or n + 2 timing, and performs the uplink reception operation.
  • the fallback mode transmission is 1) when the first signal transmission is delivered in a specific downlink control information (DCI) format, 2) when DCI for the first signal transmission is delivered in a specific search space, 3)
  • DCI downlink control information
  • the DCI may be delivered using at least one predetermined RNTI value in one way.
  • the delay of the base station is performed.
  • the second signal may be transmitted at n + 4 timing at all times. That is, in the above method, even if the terminal is configured to transmit the second signal at the n + 3 timing, when the downlink scheduling is performed in the DCI format 1A, the terminal transmits the second signal at the n + 4 timing.
  • the use of the fallback mode transmission is, for example, the DCI is a cell common search space.
  • the second signal may always be transmitted at n + 4 timing with respect to the first signal related to the DCI regardless of the delay mode reduction setting of the base station. That is, in the above method, even if the terminal is configured to transmit the second signal at the n + 3 timing, when the DCI is transmitted in the cell common search region, the terminal transmits the second signal at the n + 4 timing.
  • the second signal may always be transmitted at n + 4 timing with respect to the delay mode reduction setting of the base station for the first signal associated with the DCI. That is, in the above method, even if the UE is configured to transmit the second signal at n + 3 timing, if the PDCCH or EPDCCH decoding succeeds using the RNTI value, the terminal transmits the second signal at n + 4 timing. .
  • FIG. 1f is a diagram illustrating a method for uplink transmission by a terminal when the base station sets a delay reduction mode to the terminal and transmits a first signal (1f01).
  • the terminal checks whether the first signal transmission is the fallback mode scheduling (1f03), and if the fallback mode transmission is correct in the confirmation (1f03), delay reduction mode Regardless of the setting, the second signal is transmitted at an n + 4 timing (1f05). If it is not the fallback mode transmission in the confirmation 1f03, the second signal is transmitted at a timing determined by the delay reduction mode setting, for example, an n + 3 timing or an n + 2 timing (1f07).
  • the base station sets the delay reduction mode through the higher signaling to the terminal and simultaneously uses the fallback mode transmission, when the uplink transmission method occurs when the uplink transmission timing is overlapped with FIG. This is explained with reference.
  • the terminal supporting the delay reduction mode may transmit second signals with respect to the first signals transmitted at various timings at the same timing. For example, a second signal for the first signal transmitted in subframe n is transmitted in subframe n + 4, and a second signal for the first signal transmitted in subframe n + 1 is also in subframe n + 4. May be delivered.
  • the subframe n may be scheduled by the fallback mode transmission, and the subframe n + 1 may be scheduled by the delay reduction mode set to n + 3 timing transmission.
  • FIG. 1G illustrates an example in which second signals for first signals transmitted at various timings are scheduled to be delivered at the same timing as described above.
  • the subframe n becomes the fallback mode scheduling 1g10, and in the subframe n + 1, the delayed mode scheduling 1g12 processed in the n + 3 timing is performed. That is, a case where all of the second signals for the first signal transmitted in subframe n and subframe n + 1 are transmitted in subframe n + 4 (1g14) may occur.
  • the second signal transmission method of the corresponding terminal is provided below.
  • a second signal for the first signal transmitted in subframe n is transmitted in subframe n + 4
  • a second signal for the first signal transmitted in subframe n + 1 is also in subframe n +. It is assumed that the case is delivered to 4. However, the method provided by the present invention can be applied in other cases.
  • the second signal transmitted in subframe n + 4 is 1) a second signal for first signal transmitted in subframe n, 2) a second signal for first signal transmitted in subframe n + 1, 3 )
  • One or more of the three methods of the second signal for the first signal transmitted in subframe n and the second signal for the first signal transmitted in subframe n + 1 may be used.
  • both the second signal for 1g10 scheduling, which is a fallback mode transmission, and the second signal for 1g12 scheduling, which is a delayed mode transmission may be used.
  • the UE transmits only the second signal for the first signal transmitted in subframe n in subframe n + 4. That is, the UE transmits the second signal for the first signal transmitted in the subframe n in the subframe n + 4 regardless of scheduling in the subframe n + 1.
  • the first signal transmitted in the subframe n is scheduled to transmit the second signal at n + 4 timing, and may be, for example, a fallback mode transmission.
  • the first signal transmitted in the subframe n + 1 is scheduled to transmit a second signal at n + 3 timing, and therefore, the second signal must be transmitted in n + 4, which is, for example, a delay reduction mode setting transmission date. Can be.
  • a PDSCH is transmitted in subframe n, and the PDSCH is scheduled so that the UE transmits HARQ-ACK at n + 4 timing, and in subframe n + 1, HARQ-ACK is transmitted at n + 3 timing.
  • the UE transmits the second signal at the n + 3 timing transmitted in subframe n + 1.
  • HARQ-ACK for the PDSCH transmitted in subframe n may be transmitted in subframe n + 4.
  • PDCCH / EPDCCH including PUSCH scheduling information is transmitted in subframe n.
  • the scheduling is such that the UE transmits the PUSCH at n + 4 timing.
  • subframe n + 1 at n + 3 timing
  • the UE transmits a second signal at the n + 3 timing transmitted in subframe n + 1.
  • the scheduled first signal may be ignored and the PUSCH scheduled in subframe n may be transmitted in subframe n + 4.
  • the UE transmits only the second signal for the first signal transmitted in the subframe n + 1 in the subframe n + 4. That is, the UE transmits the second signal for the first signal transmitted in the subframe n + 1 in the subframe n + 4 regardless of scheduling in the subframe n.
  • the first signal transmitted in the subframe n is scheduled to transmit the second signal at n + 4 timing, and may be, for example, a fallback mode transmission.
  • the first signal transmitted in the subframe n + 1 has been scheduled to transmit a second signal at n + 3 timing (and therefore must transmit a second signal at n + 4), which is, for example, delayed mode setting transmission. Can be.
  • PDSCH transmission is performed in subframe n + 1, and the PDSCH is scheduled so that the UE transmits HARQ-ACK at n + 3 timing, and in subframe n, HARQ-ACK is transmitted at n + 4 timing.
  • the PDCCH / EPDCCH scheduled to transmit the PUSCH at the scheduled PDSCH or n + 4 timing is transmitted, the UE ignores the first signal scheduled to be transmitted at the n + 4 timing transmitted in subframe n, HARQ-ACK for the PDSCH, which is transmitted in subframe n + 1, may be transmitted in subframe n + 4.
  • PDCCH / EPDCCH including PUSCH scheduling information is transmitted in subframe n + 1.
  • the scheduling is configured such that the UE transmits a PUSCH at n + 3 timing. In subframe n, n + 4 timing. If the PDSCH scheduled to transmit HARQ-ACK or PDCCH / EPDCCH scheduled to transmit PUSCH at n + 4 timing is transmitted, the UE is scheduled to transmit a second signal at n + 4 timing transmitted in subframe n. The first signal may be ignored and a PUSCH scheduled in subframe n + 1 may be transmitted in subframe n + 4.
  • the UE simultaneously transmits a second signal for the first signal transmitted in subframe n and a second signal for the first signal transmitted in subframe n + 1 in subframe n + 4. .
  • the first signal transmitted in the subframe n is scheduled to transmit the second signal at n + 4 timing, and may be, for example, a fallback mode transmission.
  • the first signal transmitted in the subframe n + 1 has been scheduled to transmit a second signal at n + 3 timing (and therefore must transmit a second signal at n + 4), which is, for example, the delay reduction mode setting. It may be a transmission.
  • PDSCH transmission is performed in subframe n, and the PDSCH is scheduled so that the UE transmits HARQ-ACK at n + 4 timing, and in subframe n + 1, HARQ-ACK is transmitted at n + 3 timing.
  • the UE may simultaneously transmit HARQ-ACK information on the PDSCH transmitted in subframe n and HARQ-ACK information on the PDSCH transmitted in subframe n + 1 at the same time in subframe n + 4.
  • PUCCH or PUSCH may be used, and two HARQ-ACK information may be multiplexed or bundled.
  • ACK information is transmitted from the subframe n + 4 to the base station only when the UE successfully decodes the PDSCH transmitted in the subframe n and the PDSCH transmitted in the subframe n + 1.
  • the UE transmits NACK information to the base station in subframe n + 4.
  • the multiplexing or bundling may be higher signaled from the base station to the terminal.
  • PDSCH transmission is performed in subframe n, and the PDSCH is scheduled to transmit HARQ-ACK at n + 4 timing, and in subframe n + 1, n + 3 If the PDCCH / EPDCCH scheduled to transmit the PUSCH is transmitted at the timing, the UE includes HARQ-ACK information on the PDSCH transmitted in the subframe n in the PUSCH scheduled in the subframe n + 1 and simultaneously in the subframe n + 4.
  • the UE Channel state information (CSI) for an aperiodic CSI trigger transmitted in subframe n may be included in a PUSCH scheduled in subframe n + 1 and transmitted simultaneously in subframe n + 4.
  • PDCCH / EPDCCH including PUSCH scheduling information is transmitted in subframe n.
  • the scheduling is such that the UE transmits the PUSCH at n + 4 timing.
  • the UE includes HARQ-ACK information for the PDSCH transmitted in subframe n + 1 in the PUSCH scheduled in subframe n. It can be transmitted simultaneously in subframe n + 4.
  • PDCCH / EPDCCH including PUSCH scheduling information is transmitted in subframe n.
  • the scheduling is such that the UE transmits the PUSCH at n + 4 timing.
  • the methods 1), 2), and 3) described above may be used interchangeably as scheduled in subframe n and subframe n + 1.
  • PDSCH transmission is performed in subframe n, and the PDSCH is scheduled so that the UE transmits HARQ-ACK at n + 4 timing, and in subframe n + 1, HARQ-ACK is transmitted at n + 3 timing.
  • the UE may simultaneously transmit HARQ-ACK information on the PDSCH transmitted in subframe n and HARQ-ACK information on the PDSCH transmitted in subframe n + 1 at the same time in subframe n + 4.
  • PUCCH or PUSCH may be used, and two HARQ-ACK information may be multiplexed or bundled.
  • subframe n + 1 PDCCH / EPDCCH including PUSCH scheduling information is transmitted.
  • the scheduling is such that the UE transmits the PUSCH at n + 3 timing.
  • the PUSCH is transmitted at n + 4 timing.
  • the UE ignores scheduling to transmit the PUSCH at the n + 4 timing transmitted in the subframe n, and only the PUSCH scheduled in the subframe n + 1 is transmitted to the subframe n + 4.
  • FIGS. 1H and 1I a transmitter, a receiver, and a processor of the terminal and the base station are illustrated in FIGS. 1H and 1I, respectively.
  • the base station and the terminal are configured to determine the transmission / reception timing and the terminal transmission power of the second signal and perform the operation according thereto.
  • the transmission and reception method of the present invention is shown, and in order to perform this, the receiving unit, the processing unit, and the transmitting unit of the base station and the terminal should operate according to the embodiments.
  • the terminal receiving unit 1h00 may receive a signal including the second signal transmission timing information from the base station, and the terminal processing unit 1h02 may control to interpret the second signal transmission timing. Thereafter, the terminal transmitter 1h04 transmits the second signal at the timing.
  • 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
  • a signal is transmitted and received in units of subframes having a Transmission Time Interval (TTI) of 1 ms.
  • TTI Transmission Time Interval
  • a terminal shortened-TTI / shorter-TTI UE
  • Shortened-TTI terminals are expected to be suitable for services such as voice over LTE (VoLTE) services and remote control where latency is important.
  • the shortened-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 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 (2a02) OFDM symbols are gathered to form one slot 2a06, and two slots are gathered to form one subframe 2a05.
  • the length of the slot is 0.5ms and the length of the subframe is 1.0ms.
  • the radio frame 2a14 is a time domain section 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 (2a04) 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 a resource element (RE).
  • a resource block 2a08 (Resource Block; RB or PRB) is defined as N symb (2a02) consecutive OFDM symbols in the time domain and N RB (2a10) consecutive subcarriers in the frequency domain.
  • N symb N symb x N RB REs 2a12.
  • the minimum transmission unit of data is the RB unit.
  • the downlink control information is transmitted within the first N OFDM symbols in the subframe.
  • N ⁇ 1, 2, 3 ⁇ . Therefore, the N value varies in each subframe according to the amount of control information to be transmitted in the current subframe.
  • the control information includes a control channel transmission interval indicator indicating how many control information is transmitted over the OFDM symbol, scheduling information for downlink data or uplink data, HARQ ACK / NACK signal, and the like.
  • DCI downlink control information
  • DCI defines various formats to determine whether scheduling information (UL grant) for uplink data or scheduling information (DL grant) for downlink data, whether or not a compact DCI with a small size of control information, and using multiple antennas. It operates by applying DCI format determined according to whether spatial multiplexing is applied or whether it is DCI for power control.
  • DCI format 1 which is scheduling control information (DL grant) for downlink data, is configured to include at least the following control information.
  • Resource allocation type 0/1 flag Notifies 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 Notifies the 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 Informs the modulation scheme used for data transmission and the size of the transport block that is the data to be transmitted.
  • HARQ process number Notifies the process number of HARQ.
  • New data indicator notifies whether HARQ initial transmission or retransmission.
  • Redundancy version notifies the redundant version of the HARQ.
  • TPC Transmit Power Control
  • PUCCH Physical Uplink Control CHannel
  • the DCI is independently scrambled with a specific Radio Network Temporary Identifier (RNTI) for each UE, cyclic redundancy check (CRC) is added and channel coded, and then each configured as an independent PDCCH. do.
  • RNTI Radio Network Temporary Identifier
  • CRC cyclic redundancy check
  • 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 spread over the entire system transmission band.
  • the downlink data is transmitted through a physical downlink shared channel (PDSCH) which is a physical channel for downlink data transmission.
  • PDSCH is transmitted after the control channel transmission interval, and scheduling information such as specific mapping positions and modulation schemes in the frequency domain is informed by the DCI transmitted through the PDCCH.
  • the base station notifies the UE of a modulation scheme applied to a PDSCH to be transmitted and a transport block size (TBS) of data to be transmitted through an MCS configured of 5 bits among control information constituting the DCI.
  • 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 methods supported by the LTE system are Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (16QAM), and 64QAM, and each modulation order 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
  • 64QAM 64QAM
  • FIG. 2B is a diagram illustrating 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 the LTE-A system according to the prior art.
  • 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.
  • 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 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.
  • 2C is a diagram illustrating timing of a base station and a terminal when receiving an uplink scheduling approval in an FDD LTE system, transmitting uplink data, receiving downlink data, and transmitting HARQ ACK or NACK.
  • the propagation delay time may be regarded as a value obtained by dividing a path through which radio waves are transmitted from a terminal to a base station by the speed of light, and in general, may be considered as a value obtained by dividing the distance from the terminal to the base station by the speed of light.
  • the terminal When the base station transmits an uplink scheduling grant or downlink control signal and data to the terminal in subframe n (2d02), the terminal receives the uplink scheduling grant or downlink control signal and data in subframe n (2d04). . At this time, the terminal receives a delay of the transmission delay time TP (2d10) later than the time transmitted by the base station.
  • the UE transmits uplink data in subframe n + 4 (2d06). 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 (2d06). Even when the terminal transmits a signal to the base station, in order to arrive at the base station at any particular time, uplink data or downlink at a timing 2d06 earlier than the subframe n + 4 of the signal reference received by the terminal by TA 2d12. It transmits HARQ ACK / NACK for data.
  • the base station calculates the absolute value of the TA of the corresponding terminal.
  • the base station may calculate the absolute value of the TA by adding or subtracting a change amount of the TA value transmitted through higher signaling to the TA value first transmitted to the terminal in the random access step.
  • the absolute value of TA may be a value obtained by subtracting the start time of the nth TTI received by the UE from the start time of the nth TTI transmitted by the UE.
  • 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
  • 3 ms-TA which is a time for the terminal shown in FIG. 2D to prepare a transmission signal, may be changed as shown in FIG. 2E in case of a short-TTI terminal or a terminal having a large absolute value 2e11 of TA.
  • 3 TTIs-TA 2e13
  • the maximum value of TA assumed by the UE for short-TTI operation may be separately set.
  • the maximum value of the TA for the short-TTI operation is smaller than the maximum value of the TA of the conventional LTE system, and may not be predetermined between the base station and the terminal and may be a value arbitrarily assumed to determine the terminal support capability.
  • a terminal supporting the short-TTI operation needs an operation method when a TA exceeding the maximum TA value for the short-TTI operation is allocated.
  • a method for the terminal to transmit information on whether the short-TTI operation is possible to the base station.
  • 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 Massive Machine Type Communications
  • URLLC is a service aimed at high reliability and low latency.
  • different requirements may be applied according to the type of service applied to the terminal.
  • performing a given operation within a given processing time may vary for each service type. Since low latency is important for URLLC, it may be important to perform a predetermined operation within a short time. Accordingly, the limitation of the TA value required for the terminal may vary according to the type of service provided to the terminal. It may be specified that the terminal assumes different TA maximum values for each service, or the terminal may assume the same TA maximum value even if the service is different.
  • the base station is a subject performing resource allocation of the terminal, and may be at least one of an eNode B, a Node B, a base station (BS), 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.
  • 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 not departing from the scope of the present invention by the judgment of those skilled in the art.
  • the shortened-TTI terminal described may be referred to as a first type terminal, and a normal-TTI terminal may be referred to as a second type terminal.
  • the first type terminal may include a terminal capable of transmitting control information, data, or control information and data in a transmission time interval shorter than 1 ms or 1 ms, and the second type terminal controls in a transmission time interval of 1 ms. It may include a terminal capable of transmitting information, data, or control information and data.
  • shortened-TTI terminal and the first type terminal are mixed and used
  • normal-TTI terminal and the second type terminal are mixed and used.
  • shortened-TTI, shorter-TTI, shortened TTI, shorter TTI, short TTI, sTTI have the same meaning and are used interchangeably.
  • normal-TTI, normal TTI, subframe TTI, legacy TTI have the same meaning and are used interchangeably.
  • the shortened-TTI transmission and the first type transmission are used interchangeably, and the normal-TTI transmission and the second type transmission are used interchangeably.
  • the first type terminal may support both first type transmission and second type transmission, or may support only first type transmission.
  • the second type terminal supports the second type transmission and cannot transmit the first type.
  • the first type terminal may be interpreted as being for the first type transmission.
  • normal-TTI transmission may be referred to as a first type transmission
  • longer-TTI transmission may be referred to as a second type transmission.
  • the first type reception and the second type reception may refer to a process of receiving the first type transmission and the second type transmission signals, respectively.
  • 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, but in the present invention, the PDSCH may be referred to as normal-TTI data
  • the sPDSCH is a physical channel through which shortened-TTI data is transmitted, but according to the present invention, the sPDSCH is shortened. It can be called TTI data.
  • shortened-TTI data transmitted in downlink and uplink will be referred to as sPDSCH and sPUSCH.
  • a normal-TTI terminal refers to a terminal that transmits and receives control information and data information in units of 1 ms or one subframe.
  • the control information for the normal-TTI terminal is transmitted on a PDCCH mapped to up to 3 OFDM symbols in one subframe, or transmitted on an EPDCCH mapped to a specific resource block in one subframe.
  • 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 in the present invention may belong to categories such as Enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (mMTTC), Ultra-Reliable and Low-latency Communications (URLLC), and the like.
  • eMBB Enhanced Mobile Broadband
  • mMTTC Massive Machine Type Communications
  • URLLC Ultra-Reliable and Low-latency Communications
  • 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 / reception 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 in the present invention in an FDD system may be applied to a TDD system according to a simple modification.
  • the reference signal may refer to a signal that the base station and the terminal are known to each other so that the base station or the terminal can measure the channel and utilize the received signal.
  • the RS and the RS may be used interchangeably.
  • Embodiment 2-1 provides a method of notifying whether RS is transmitted in downlink or uplink transmission. Whether or not the RS is transmitted may mean informing that the RS is transmitted or not transmitted in the corresponding TTI.
  • a cell common RS or RS for demodulation is transmitted in every subframe.
  • the ratio of RS to short TTI transmission may be larger than that of RS to long TTI transmission, it may be advantageous to omit RS transmission instead of RS for every TTI in short TTI transmission.
  • FIG. 2F illustrates a method of dividing one subframe into six two-symbol TTIs in uplink transmission.
  • Each TTI may be defined as 2f02, 2f04, 2f06, 2f08, 2f10, and 2f12, and the first symbol in each TTI is determined to be used as RS.
  • the last TTI (2f06, 2f12) of each slot consists of three symbols up to the RS transmission symbol, the last symbol may be a symbol that is not transmitted. For example, when SRS is transmitted in the last symbol of a slot or the last symbol of a subframe, it can be omitted.
  • whether RS is omitted or not is transmitted according to an absolute value of a specific bit of DCI, but may be transmitted to the terminal in a toggle form. That is, as compared with a specific bit of the DCI previously transmitted, a method of omitting RS may be omitted if the specific bit of the current DCI is different from a specific bit value of the previous DCI.
  • the method of 3) may inform the UE of the TTI length and location to be used in downlink or uplink in DCI, and thus the UE may determine a RS location accordingly.
  • the terminal may use an RS position according to the corresponding TTI.
  • 2G and 2H illustrate examples of a TTI position and an RS position in an uplink 2 symbol TTI transmission method.
  • the number of symbols including or not including the RS symbols in the TTI is two symbols, a two symbol TTI will be described.
  • Embodiment 2-2 describes a method for a base station to inform a user equipment of the location of an SC-FDMA symbol on which an uplink reference signal (RS) is transmitted.
  • RS uplink reference signal
  • FIG. 2K is a diagram illustrating an example of a structure of a shortened-TTI having two symbols or three symbols included in one subframe in TTI units in uplink transmission.
  • each shortened TTI in an uplink subframe may consist of 3, 2, 2, 2, 2, and 3 SC-FDMA symbols.
  • one subframe may have shortened TTIs of six two symbols or three symbols, such as sTTI 0, sTTI 1, sTTI 2, sTTI 3, sTTI 4, and sTTI 5.
  • Table 2b-a shows the possible options of the position of the possible RS symbols in the two symbol shortened TTI.
  • R denotes an SC-FDMA symbol in which RS is transmitted
  • D denotes an SC-FDMA symbol in which data, ie, sPUSCH, is transmitted. Therefore, in (a), option 1 is an option where no RS is transmitted, option 2 is the last symbol of the previous shortened TTI, the RS of that shortened TTI is transmitted, and option 3 is the first symbol of that shortened TTI.
  • RS is transmitted, option 4 is an RS is transmitted in the last symbol of the shortened TTI, option 5 is an example of the RS is transmitted in the first symbol of the next shortened TTI.
  • [Table 2b]-(b) show the possible options of the position of the possible RS symbols in the 3 symbol shortened TTI.
  • R denotes an SC-FDMA symbol in which RS is transmitted
  • D denotes an SC-FDMA symbol in which data, ie, sPUSCH, is transmitted. Therefore, in (a), option 1 is an option where no RS is transmitted, option 2 is the last symbol of the previous shortened TTI, the RS of that shortened TTI is transmitted, and option 3 is the first symbol of that shortened TTI.
  • option 4 sends the RS in the second symbol of the shortened TTI
  • option 5 sends the RS in the last symbol of the shortened TTI
  • option 6 sends the corresponding shortened, in the first symbol of the next shortened TTI It shows an example in which the RS of the TTI is transmitted.
  • the base station may use some bitfields of the DCI for transmitting the uplink data transmission grant to indicate the position of the uplink RS symbol transmitted together during the uplink data transmission. For example, when some 3 bits of the uplink data transmission grant DCI is used as a bitfield indicating the position of the uplink RS symbol, as shown in Table 2c below, each bitfield is located at the position of the uplink RS symbol. Can point to.
  • each bitfield may indicate a position of an uplink RS symbol.
  • [Table 2d] is an example of using one shortened TTI with the option not including RS
  • [Table 2e] is an example of using one shortened TTI except the option without RS. to be
  • [Table 2f] is an example of using RS so that one shortened TTI does not come after the shortened TTI.
  • [Table 2f] may be intended to prevent the RS from coming after the shortened TTI because the channel estimation may take longer because the channel estimation is delayed when the RS is received after the shortened TTI.
  • [Table 2d], [Table 2e] and [Table 2f] are each an example of selecting and using four of the options shown in [Table 2c], but need not be limited only to the tables. will be.
  • the present invention can be applied by variously modifying the method of selecting four.
  • one part of the DCI for uplink data transmission grant is used as a bitfield indicating a position of an uplink RS symbol, thereby indicating one of the two selected above by the DCI. Can be used as a role.
  • the base station may select only one of the options shown in [Table 2c] to inform the terminal of the higher signaling, and may indicate which option RS position is to be used in which shortened TTI of one subframe.
  • the bitfield indicating the position of the RS in the DCI for the uplink data transmission grant may not be necessary.
  • a bit field indicating a position of an RS has 1 bit, and when the 1 bit transmits uplink data in a corresponding shortened TTI, the RS is transmitted at the higher signaled position. It may indicate whether to transmit or omit the transmission of RS and transmit data in the corresponding symbol.
  • [Table 2f] can be fixedly used as options for indicating the location of SC-FDMA symbol transmitting RS and data of shortened TTI including 2 symbols or 3 symbols as shown in [Table 2g].
  • the base station delivers two or four of the options in [Table 2c] to the terminal by higher signaling, and the terminal indicates an option indicated by one or two bits of DCI among the two or four, It can be determined by the location information of the RS.
  • [Table 2h] below is a method of determining 1 bit of DCI bitfield among two higher signaled options
  • [Table 2i] below is a method of determining 2 bits of DCI bitfield among 4 higher signaled options.
  • the terminal When the terminal receives a DCI including grant information for uplink data transmission for higher signaling or shortened TTI as described above, the terminal interprets a predetermined bitfield of the received DCI as position information of a symbol including an uplink RS, When transmitting the uplink data, RS is transmitted at the position of the RS symbol indicated by the DCI, and data is transmitted in another shortened TTI symbol or symbols.
  • the base station transmits a DCI including grant information for uplink data transmission for uplink signaling or shortened TTI to the terminal, and when the corresponding uplink data is received, the BS indicates a symbol of a location indicated by the DCI. Assuming RS is received, perform channel estimation. Data demodulation is performed using the estimated channel.
  • FIGS. 2I and 2J a transmitter, a receiver, and a processor of the terminal and the base station are illustrated in FIGS. 2I and 2J, respectively. Transmitting and receiving methods of a base station and a terminal for determining transmission timing of the second signal and performing an operation according to 1) to 3) of the embodiment 2-1 are shown. , The processor and the transmitter shall each operate according to the embodiment.
  • Figure 2i 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 2i00, a terminal transmitter 2i04, and a terminal processor 2i02.
  • the terminal receiver 2i00 and the terminal may collectively be referred to as a transmitter / receiver in the embodiment of the present invention.
  • the terminal transceiver may transmit / receive a signal with the base station.
  • the signal may include control information and data.
  • the terminal transceiver unit may be composed of a radio frequency (RF) transmitter for up-converting and amplifying a frequency of a transmitted signal, and an RF receiver for low noise amplifying a received signal and down-converting a frequency of the received signal.
  • RF radio frequency
  • the terminal transceiver may receive a signal through a wireless channel, output the signal to the terminal processor 2i02, and transmit a signal output from the terminal processor 2i02 through a wireless channel.
  • the terminal processing unit 2i02 may control a series of processes so that the terminal may operate according to the above-described embodiment of the present invention.
  • the terminal processing unit 2i02 may control to interpret whether the RS transmission is performed and the RS symbol position from the signal. Can be. Thereafter, the terminal processor 2i02 controls the terminal transmitter 2i04 to transmit an RS at a designated symbol position or to perform uplink data transmission by omitting RS transmission by using the transmitted information by the terminal transmitter 2i04. .
  • the base station of the present invention may include a base station receiver 2j01, a base station transmitter 2j05, and a base station processor 2j03.
  • the base station receiver 2j01 and the base station transmitter 2j05 may be collectively referred to as a transceiver in the embodiment of the present invention.
  • the base station 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 base station transceiver unit may receive a signal through a wireless channel, output the signal to the base station processor 2j03, and transmit a signal output from the base station processor 2j03 through the wireless channel.
  • the base station processor 2j03 may control a series of processes to operate the base station according to the above-described embodiment of the present invention.
  • the base station processor 2j03 may control to generate control information including whether RS transmission is omitted or an RS symbol position. Subsequently, the base station processor 2j03 transmits the control signal from the base station transmitter 2j05, and the base station receiver 2j01 performs the base station transmitter 2j05 and the base station receiver 2j01 to perform reception for uplink transmission according to the above setting. ).
  • 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' plays 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.
  • ⁇ unit 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.
  • eMBB Enhanced Mobile Broadband
  • mMTTC Massive Machine Type Communications
  • URLLC Ultra-Reliable and Low-latency Communications
  • eMBB may be a high speed data transmission
  • mMTC may be a terminal for minimizing terminal power and accessing multiple terminals
  • URLLC may be a service aiming at high reliability and low latency, but is not limited thereto.
  • URLLC service transmission time may be assumed to be shorter than eMBB and mMTC service transmission time, but is not limited thereto.
  • the three services may be major scenarios in an LTE system or a system such as 5G / NR (new radio, next radio) after LTE.
  • the base station sets some or all control information of the terminal and performs resource allocation, and includes an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, a transmission and reception point (TRP), or It may be at least one of the nodes on the 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.
  • downlink is a radio transmission path of a signal transmitted from a base station to a terminal
  • uplink is a radio transmission path of a signal transmitted from a terminal to a base station.
  • LTE Long Term Evolution
  • UL uplink
  • 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.
  • 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.
  • the uplink refers to a radio link through which a terminal or user equipment (UE) or a mobile station (MS) transmits data or control signals to an eNode B or a base station (BS), and the downlink refers to a base station
  • the above-described multiple access scheme is generally designed such that orthogonality does not overlap the time-frequency resources for carrying data or control information for each user. By establishing and assigning, data or control information of each user can be distinguished.
  • 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. 3a 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 or a similar 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 (3a-102) OFDM symbols are gathered to form one slot 3a-106, and two slots are gathered to form one subframe 3a-105. Configure The length of the slot is 0.5ms and the length of the subframe is 1.0ms.
  • the radio frames 3a to 114 are time domain sections consisting of ten 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 (3a-104) subcarriers in total. However, such specific numerical values may be applied variably.
  • the basic unit of resources in the time-frequency domain may be represented by an OFDM symbol index and a subcarrier index as resource elements (RE).
  • the resource block 3a-108 (Resource Block; RB or PRB) includes N symb (3a-102) consecutive OFDM symbols in the time domain and N RB (3a-110) consecutive subcarriers in the frequency domain. It can be defined as.
  • one RB 3a-108 in one slot may include N symb x N RB REs 3a-112.
  • the frequency-domain minimum allocation unit of data is the RB.
  • the data rate increases in proportion to the number of RBs scheduled to the UE.
  • the LTE system can define and operate 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 3a below shows a correspondence relationship between system transmission bandwidth and channel bandwidth defined in the LTE system. For example, an LTE system having a 10 MHz channel bandwidth may have a transmission bandwidth of 50 RBs.
  • 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 ID) independently for each UE, cyclic redundancy check (CRC) is added, and channel coded, and then configured with independent PDCCHs. Is sent.
  • RNTI Radio Network Temporary Identifier
  • CRC cyclic redundancy check
  • the PDCCH is mapped and transmitted during the control channel transmission period.
  • the frequency domain mapping position of the PDCCH is determined by an identifier (ID) of each terminal, and can be transmitted by being spread over the entire system transmission band.
  • 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.
  • 3b is a diagram illustrating 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-202, and N symb UL SC-FDMA symbols may be combined to form one slot 3b-206. Two slots are gathered to form one subframe 1b-205.
  • the minimum transmission unit in the frequency domain is a subcarrier, and the entire system transmission bandwidth (1b-204) consists of a total of N BW subcarriers. N BW 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-212.
  • the resource block pair 1b-208 (RB pair) may be defined as N symb UL contiguous SC-FDMA symbols in the time domain and N sc RB contiguous subcarriers in the frequency domain. Therefore, one RB is composed of N symb UL x N sc RB Rs .
  • the minimum transmission unit for data or control information is in RB units. In the case of PUCCH, it is mapped to a frequency domain corresponding to 1 RB and transmitted for 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 can be defined.
  • FDD frequency division duplex
  • HARQ ACK / NACK corresponding to a PDCCH / EPDCCH including a PDSCH or an SPS release transmitted in an n-4th subframe is a PUCCH or PUSCH in an nth subframe.
  • 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 may buffer the data determined as an error as a result of decoding the received data for the HARQ operation, and then perform combining with the next retransmission data.
  • k may be 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 the subframe configuration and the subframe number.
  • the value of k may be differently applied according to the TDD setting of each carrier when transmitting data through a plurality of carriers.
  • the uplink HARQ adopts a synchronous HARQ scheme with a fixed data transmission time point. That is, a Physical Hybrid (Physical Uplink Shared Channel), which is a physical channel for transmitting uplink data, a PDCCH, which is a preceding downlink control channel, and a PHICH (Physical Hybrid), which is a physical channel through which downlink HARQ ACK / NACK corresponding to the PUSCH is transmitted.
  • the uplink / downlink timing relationship of the indicator channel may be transmitted and received according to the following rule.
  • k may be defined differently according to FDD or time division duplex (TDD) of LTE system and its configuration. For example, k may be fixed to 4 in the case of an FDD LTE system. Meanwhile, in the TDD LTE system, k may be changed according to the subframe configuration and the subframe number. Also, when data is transmitted through a plurality of carriers, a value of k may be differently applied according to the TDD setting of each carrier.
  • the PHICH corresponds to the PUSCH transmitted by the terminal in subframe i-k.
  • k may be defined differently according to FDD or TDD of LTE system and its configuration. For example, in the case of an 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. In addition, the value of k may be differently applied according to the TDD setting of each carrier when transmitting data through a plurality of carriers.
  • the description of the wireless communication system has been described with reference to the LTE system, and the present invention is not limited to the LTE system but can be applied to various wireless communication systems such as NR and 5G.
  • the k value when applied to another wireless communication system, the k value may be changed and applied to a system using a modulation scheme corresponding to FDD.
  • 3C and 3D 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 is allocated in the entire system frequency band 3c-300. If the URLLC data (3c-303, 3c-305, 3c-307) occurs while the eMBB (3c-301) and the mMTC (3c-309) are allocated and transmitted in a specific frequency band, eMBB ( 3c-301) and mMTC (3c-309) are emptied of the already allocated portion, or URLLC data (3c-303, 3c-305, 3c) without transmitting eMBB (3c-301) and mMTC (3c-309) -307) can be transmitted.
  • URLLC data may be allocated (3c-303, 3c-305, 3c-307) to a portion of the resource (3c-301) 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 length of the transmission time interval (TTI) used for URLLC transmission will be described assuming that the length of the TTI used for eMBB or mMTC transmission is shorter, but the URLLC transmission TTI length is used for eMBB or mMTC transmission. The same applies to the TTI length used.
  • the response of the information related to the URLLC can be sent earlier than the response time of eMBB or mMTC, and thus can transmit and receive information with a low delay.
  • the structure of a physical layer channel used according to each service type to transmit at least one of the three services, control information, or data may be different. For example, at least one of a length of a transmission time interval (TTI), an allocation unit of frequency or time resources, a structure of a control channel, and a data mapping method may be different.
  • TTI transmission time interval
  • an allocation unit of frequency or time resources e.g., an allocation unit of frequency or time resources
  • a structure of a control channel e.g., control information, and data mapping method
  • the embodiment of the present invention does not distinguish and describe the service control information and data within the scope of the present invention without departing from the scope of the present invention by the judgment of a person skilled in the art, and the control information is included in the service data. It is possible to apply the present invention as if it is included.
  • the terms physical channel and signal in the conventional LTE or LTE-A system may be used to describe the method and apparatus proposed by the embodiment.
  • the contents of the present invention can be applied in a wireless communication system other than the LTE and LTE-A systems.
  • At least one service of a first type, a second type, and a third type of a service is transmitted or received in at least one service type transmission / reception terminal, or each service is performed in a different cell or carrier.
  • the contents of the present invention can be applied even when the type is operated.
  • At least one of an uplink scheduling grant signal and a downlink data signal is referred to as a first signal.
  • at least one of an uplink data signal for uplink scheduling configuration and a response signal (or HARQ ACK / NACK signal) for the downlink data signal is referred to as a second 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 be at least one of eMBB, URLLC, and mMTC, and the second signal may also correspond to at least one of the services.
  • the TTI length of the first signal may indicate the length of time that the first signal is transmitted as a time value associated with the first signal transmission.
  • the TTI length of the second signal may indicate a length of time that the second signal is transmitted as a time value associated with the second signal transmission
  • the TTI length of the third signal is related to the third signal transmission.
  • the time value may indicate the length of time that the third signal is transmitted.
  • a third signal is received or when a response or feedback (for example, ACK / NACK information) to the received signal is transmitted, which is a first signal, a second signal, or a third signal. It can be referred to as the transmission / reception timing of.
  • the first signal, the second signal, and the third signal may be regarded as signals for the first type service, the second type service, and the third type service.
  • the TTI length of the first signal, the second signal, and the third signal, and at least one of the first signal, the second signal, and the third signal transmission / reception timing may be set differently.
  • the TTI length of the first signal is the same as the TTI length of the second signal, but may be set longer than the TTI length of the third signal.
  • the transmission and reception timing of the first signal and the second signal may be set to n + 4, but the transmission and reception timing of the third signal may be set to be shorter than the transmission and reception timing, for example, n + 2.
  • the base station informs the terminal when to transmit the second signal Is the same as telling k.
  • the base station transmits the first signal in the n-th TTI
  • the base station transmits the second signal in the n + t + a-th TTI
  • the base station to inform the terminal of the timing to transmit the second signal in advance Equivalent to telling the offset value a based on the value t defined in or derived by a predefined method.
  • the technique proposed in the present invention can be applied not only to FDD and TDD systems but also to a new type of duplex mode (for example, LTE frame structure type 3).
  • the upper signaling refers to 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 RRC signaling or PDCP.
  • This means that the signal is transmitted between the base station and the terminal through at least one method of a MAC control element (MAC control element).
  • MAC control element MAC control element
  • an embodiment of the present invention describes an uplink transmission resource allocation method for reducing a delay between uplink transmission configuration information transmission and configured uplink transmission in providing one or more services including eMBB, mMTC, URLLC, etc. to a terminal. do.
  • embodiments of the present invention is an operation between the base station and the terminal performing uplink transmission through a licensed band Applicable to
  • the base station sets a specific transmission time interval (TTI) and a frequency resource region so that the UE can transmit uplink data or control information corresponding to eMBB, mMTC, URLLC, and the like.
  • the base station may be configured to perform uplink transmission in a subframe n + k (k ⁇ 0) to a specific terminal through a downlink control channel in subframe n.
  • the base station transmits uplink transmission configuration information to a terminal requiring uplink transmission through a downlink control channel in subframe n, and the terminal receiving the uplink transmission configuration information is the uplink transmission configuration information.
  • the uplink data or control information may be transmitted to the base station (or another terminal) by using the time and frequency resource region set in FIG.
  • the terminal having data or control information to be transmitted through the uplink may transmit scheduling request information to the base station or request that the base station transmit the uplink transmission configuration information to the terminal through a random access process.
  • uplink transmission of a general terminal may be performed in the following three steps.
  • uplink transmission through three steps is just one example, and uplink transmission through more or less steps than that described in this example is also possible.
  • Step 1 The terminal having the data or control information to be transmitted through the uplink requests the base station to uplink transmission configuration from the base station through a valid uplink resource capable of transmitting an uplink transmission setup request.
  • at least one or more resources of time resources or frequency resources that may request the uplink transmission configuration may be defined in advance or set through a higher signal.
  • Step 2 The base station receiving the uplink transmission configuration request from the terminal, configures uplink transmission by transmitting uplink transmission configuration information to the terminal through a downlink control channel.
  • Step 3 The terminal receiving uplink transmission from the base station performs uplink transmission using the uplink transmission configuration information set by the base station.
  • a terminal having generated data or control information to be transmitted through the uplink causes a transmission delay of a predetermined time or more to transmit the uplink information. For example, if the uplink transmission configuration request resource is set to a 5ms period to the terminal where the uplink transmission data has occurred at time n, a delay of up to 5ms may occur when transmitting the uplink transmission configuration request information. In addition, if a transmission delay (eg, 1 ms) is required between the reception time of the uplink configuration control information and the start time of the set uplink transmission, a transmission delay of at least 6 ms is inevitable when the UE starts uplink transmission. . Accordingly, the present invention proposes a method in which a terminal to perform an uplink signal transmission operation can perform uplink transmission without receiving separate uplink transmission configuration information from a base station.
  • a transmission delay eg, 1 ms
  • the terminal when the terminal intends to perform the uplink transmission, using a radio resource that is defined in advance from the base station or through a broadcast channel for transmitting a higher signal or system information (eg, System Information Block, SIB), etc.
  • SIB System Information Block
  • the uplink signal transmission of the terminal may be performed using the time and frequency resources set by the base station for uplink transmission of the terminal after receiving configuration information about the uplink transmission from the base station.
  • the base station and the terminal performing wireless communication in the unlicensed band, that is, after performing a channel access procedure (listen-before-talk) (LBT) occupy the unlicensed band, and transmits
  • LBT listen-before-talk
  • a method for allowing a terminal to perform uplink transmission through the unlicensed band without receiving uplink transmission configuration information from the base station is proposed.
  • the base station and the terminal performing wireless communication in the unlicensed band are previously defined according to a frequency band, a country, or the like for coexistence with other wireless devices, or after performing a channel access procedure defined in the corresponding wireless communication standard,
  • the signal may or may not be transmitted according to the result of the channel access procedure.
  • the base station or the terminal detects (eg, compares the strength of the received signal) a channel performing the wireless communication during a fixed section or a section changing according to a rule. If it is determined that the channel is idle for the set time (for example, when the strength of the received signal received from the transmitting device during the time is predefined or less than the threshold set according to the rule), The base station or the terminal may perform communication using the channel.
  • the base station or the terminal No communication is performed using the channel.
  • the terminal performs a channel access procedure for uplink control information and data transmission in steps 1 and 3, and the base station is downlink in step 2 Perform channel access procedure for transmission. Therefore, when a terminal performing wireless communication through an unlicensed band uses the method proposed in the present invention, the method for performing uplink transmission without receiving separate uplink transmission configuration information from the base station, the channel access in step 3, Since only a procedure is required, uplink transmission can be performed more efficiently.
  • the UE performing uplink transmission without receiving separate uplink transmission configuration information from the base station is referred to as grant-free transmission.
  • grant-free transmission when the terminal performs uplink transmission without receiving the configuration about the uplink transmission configuration information from the base station, at least one or more pieces of information about the uplink transmission configuration (for example, grant- If all or part of the information on the time or frequency resources available for free transmission (for example, start frequency information for grant-free transmission) is previously defined between the base station and the terminal, the terminal is configured through the higher signal from the base station. Or when the terminal is received through system information received or transmitted by the base station through a broadcast channel and when the terminal uses information set through a downlink control channel of the base station.
  • grant-free transmission when the terminal performs uplink transmission without receiving the configuration about the uplink transmission configuration information from the base station, at least one or more pieces of information about the uplink transmission configuration (for example, grant- If all or part of the information on the time or frequency resources available for free transmission (for example, start frequency information for grant-free transmission) is
  • the base station may set uplink transmission scheme of the terminal through transmission of system information through a higher signal or a broadcast channel and a downlink control channel.
  • the uplink transmission scheme of the terminal includes a grant-based transmission scheme in which the terminal receives uplink transmission configuration information from the base station and performs uplink transmission according to the received uplink transmission configuration, and the terminal is the base station. It can be divided into a grant-free transmission method that can perform uplink transmission without receiving separate uplink transmission configuration information from the.
  • the terminal may be divided into a grant-based transmission method or a grant-free transmission method, and the terminal may support both the grant-based transmission method and the grant-free transmission method.
  • the terminal when a terminal configured with a grant-free transmission method receives uplink transmission configuration information from a base station through a downlink control channel, the terminal grants the grant using the most recently received uplink transmission configuration information from the base station.
  • Uplink transmission may be performed by using a -based transmission method. In this case, the terminal may perform uplink transmission using only some of the uplink transmission configuration information most recently received from the base station.
  • the base station may set an uplink transmission scheme in the base station or cell to the terminal using an upper signal.
  • the base station configures an uplink transmission scheme of the terminal through an upper signal to the terminal as follows.
  • the base station adds a field related to an uplink transmission method of the terminal, for example, a grantfreeULtransmission field, to RRC configuration information for a specific base station or cell (or SCell, or transmission and reception point (TRP)) to the terminal.
  • a field related to an uplink transmission method of the terminal for example, a grantfreeULtransmission field
  • RRC configuration information for a specific base station or cell or SCell, or transmission and reception point (TRP)
  • TRP transmission and reception point
  • the uplink transmission scheme for the cell can be set to the grant-free transmission scheme to the UE.
  • the UE receiving the RRC field value as false may determine that an uplink transmission scheme for the cell is set to a grant-based transmission scheme for receiving and transmitting uplink control information from a base station.
  • the base station may transmit an uplink transmission scheme in the base station or cell to one or more terminals through system information transmission through a broadcast channel of the base station or cell.
  • a method of transmitting or setting an uplink transmission method of a terminal using system information transmission through a broadcast channel to a terminal is as follows.
  • a base station or cell transmits or broadcasts system information (eg, system information block (SIB)) information for a corresponding cell to one or more terminals periodically or aperiodically.
  • system information eg, system information block (SIB)
  • SIB system information block
  • the broadcast channel refers to a channel that a plurality of terminals can receive through a predefined identifier (for example, system information RNTI).
  • the system information may further include at least one of configuration information regarding a grant-free transmission scheme, for example, time for grant-free transmission and frequency resource information, as well as configuration regarding the uplink transmission scheme of the cell. It may include. If the uplink transmission scheme of the cell is set to a grant-based transmission scheme, the terminal does not include time for grant-free transmission and frequency resource information, or time for grant-free transmission and frequency resource information. If included, it can be ignored.
  • the base station may set the uplink transmission scheme of the terminal through the downlink control channel of the base station.
  • the base station configures an uplink transmission scheme of the terminal through a downlink control channel of the base station as follows.
  • the base station uses a common control channel or a cell-specific search space or a group common control channel or a group-specific search space among downlink control channels of the base station for configuring the uplink transmission scheme of the terminal. ) May be added by adding an uplink transmission method field.
  • the common control channel or the group common control channel may be configured to receive the same control information from the base station by all or a certain group of terminals through an identifier (for example, group RNTI) previously defined or set from the base station to specific terminals.
  • the base station may set the uplink transmission scheme of the UE included in the group by adding a field about the uplink transmission scheme of the group among the information on the uplink transmission transmitted in the group common control channel.
  • a field for transmitting information about an uplink transmission method or type field or whether uplink transmission setting is present or not for example, a 1-bit field, may be added and transmitted.
  • the base station may set the uplink transmission method of the terminals by adding a 2bit field to distinguish the grant-free transmission method, the grant-based transmission method, the grant-free transmission and the grant-based transmission method mixed.
  • the terminal having the uplink transmission scheme configured as the grant-free transmission scheme may include at least one or more of variables related to uplink transmission (eg, time resource domain, frequency resource domain, MCS, PMI, RI, etc.). Uplink transmission can be performed by selecting a variable.
  • variables related to uplink transmission eg, time resource domain, frequency resource domain, MCS, PMI, RI, etc.
  • the base station that has set the grant-free transmission scheme to the terminal uses one of various setting methods described in the above embodiment for periodic time resource region information capable of grant-free uplink transmission. Can be set to the terminal.
  • the terminal may further include parameters that need additional configuration in case of performing uplink transmission, for example, a frequency resource region in which actual uplink transmission is performed. You can choose to send it.
  • the base station previously selects a candidate or set value among the uplink transmission-related variables that the terminal can select, for example, MCS set (QPSK, 16QAM), frequency start region information for grant-free transmission, etc. to the terminal in advance.
  • the terminal may select a setting value to be used for uplink transmission by the terminal from among the set candidate groups.
  • the method for setting the time resource region by the base station in advance and the terminal arbitrarily selecting the frequency resource is just one example, and includes the variables other than the variables required for the uplink transmission as described above. It is also possible to select all or some of these variables.
  • a terminal in a base station or a cell operating in an unlicensed band may perform different channel access procedures according to an uplink transmission scheme configured from the base station.
  • a base station and a terminal (or transmitting device) operating in an unlicensed band should perform a channel sensing operation or channel access procedure for the unlicensed band before transmitting a downlink signal or an uplink signal to the unlicensed band.
  • the requirements for the channel access procedure may be defined in advance according to the frequency band, country, or the like, or may be defined in a corresponding wireless communication standard.
  • a channel access procedure in a transmitting device that intends to transmit a signal through an unlicensed band measures the strength of a received signal in the band for a time set according to a predefined rule for the unlicensed band in which the signal is to be transmitted. And comparing the strength of the measured signal with a threshold set according to a pre-defined rule, and checking the availability of the unlicensed band.
  • the transmitting device determines that the unlicensed band is idle, and transmits the signal through the corresponding unlicensed band. For example, when the strength of the received signal during the set time is greater than the set threshold value, the transmitting device determines that the other device occupies the unlicensed band and does not transmit the signal through the corresponding unlicensed band.
  • the channel access procedure may be repeated until the band is determined to be in an idle state.
  • the channel access procedure in a wireless communication system operating in a general unlicensed band includes a downlink channel access procedure in a base station or a cell to transmit a downlink signal and an uplink channel access procedure in a terminal to transmit an uplink signal.
  • a downlink channel access procedure in a base station or a cell to transmit a downlink signal and an uplink channel access procedure in a terminal to transmit an uplink signal.
  • a base station transmits a downlink control channel and a data channel through an unlicensed band determined to be idle through a downlink channel access procedure, and if there is a terminal requiring uplink transmission through the unlicensed band, The base station may set uplink transmission to the terminal using a downlink control channel.
  • the terminal in which uplink transmission is configured for the unlicensed band is defined in advance for the set uplink transmission or after performing a channel access procedure established through uplink transmission configuration information from the base station, and then performs the configured uplink transmission. It may or may not be performed.
  • a downlink channel access procedure for transmitting uplink transmission configuration information of the base station and the configured uplink transmission of the terminal Each requires an uplink channel access procedure.
  • the grant-free uplink transmission scheme is configured for the terminal
  • the downlink channel access procedure of the base station is not required in the unlicensed band for uplink signal transmission, and the uplink configured after the terminal performs the uplink channel access procedure.
  • Link transmission may or may not be performed. Accordingly, at least one of a variable required for a channel access procedure of each of a terminal performing uplink transmission according to a grant-based uplink transmission scheme in an unlicensed band and a terminal performing uplink transmission according to a grant-free uplink transmission scheme.
  • the above variables can be set differently.
  • the base station sets the channel access procedure of the terminal that receives the uplink transmission configuration information differently from the channel access procedure of the terminal capable of performing uplink transmission without receiving separate uplink transmission configuration information from the base station.
  • grant-based uplink transmission may be prioritized to grant-free based uplink transmission to occupy an unlicensed band.
  • Priority for the grant-based and grant-free transmission may vary depending on the configuration of the base station, but in the present invention, the channel for the grant-based transmission generally requires a downlink channel access procedure for the unlicensed band of the base station. Assume that the access priority is higher than the channel access priority for grant-free transmission.
  • a channel access procedure (hereinafter, referred to as a first type of channel access procedure) for uplink transmission of a terminal to which a grant-based uplink transmission scheme is configured from a base station is performed before performing uplink transmission of the terminal. Since the base station performs the downlink channel access operation, a configuration variable necessary for performing a channel access procedure (hereinafter, referred to as a second type of channel access procedure) for uplink transmission of a terminal configured to grant-free uplink transmission from the base station. At least one of the variables may be set in a direction for increasing a channel access probability or a value for facilitating the licence-exempt band channel occupancy of the terminal for which the grant-based uplink transmission is set.
  • the terminal receives a variable set differently according to the grant-based uplink transmission scheme and the grant-free uplink transmission scheme through an upper signal from the base station, uplink scheduling information (or UL grant), or one or more parameters.
  • Group common control information transmitted to a terminal or group terminals may be configured through a downlink control channel (PDCCH) or a group common control channel ((group) common PDCCH).
  • PDCH downlink control channel
  • group common PDCCH group common control channel
  • the UE receives configuration parameters required to perform the second type of channel access procedure through an upper signal (for example, RRC configuration) from the base station and transmits an uplink signal without receiving uplink transmission configuration information from the base station.
  • a channel access procedure for uplink transmission may be performed according to the configured uplink channel access procedure of the second type.
  • the terminal when receiving an uplink transmission configuration information from the base station and transmitting an uplink signal accordingly, the terminal, through the received uplink transmission configuration information, at least one configuration associated with the first type of uplink channel access A variable may be set and an uplink channel access procedure of a first type may be performed according to the configuration value.
  • a threshold (or energy detection threshold) of the strength of a received signal for determining an idle state of the unlicensed band is received in the second type of channel access procedure. It may be set to a value larger than the threshold value of the signal strength. In this case, the probability that the unlicensed band is determined to be idle through the channel access procedure of the first type or the channel access possibility when the channel access procedure of the first type is performed is the channel access procedure of the second type. It may be set to be larger than when the.
  • the terminal measures the strength of the received signal to determine the time required for determining the idle state of the unlicensed band, that is, whether the unlicensed band is idle.
  • the channel access procedure of the second type is the average time or absolute time value (hereinafter, the length of the channel detection interval) to which the measured intensity of the received signal is compared with a threshold (or energy detection threshold) for the preset strength of the received signal. It may be set to a value smaller than the average time or the absolute time value of the channel detection interval required by.
  • the probability that the unlicensed band is determined to be idle through the channel access procedure of the first type or the channel access possibility when the channel access procedure of the first type is performed is the channel access procedure of the second type. It may be set to be larger than when.
  • the channel access procedure of the first type is set to be performed for X hours defined in advance or set from the base station, and the channel access procedure of the second type is set to be performed for Y time (Y> X) longer than the time X applied in the first type.
  • Y time Y> X
  • at least one of the X and Y may be a predefined time, or may be a time interval fixed to a time set from a base station or a time calculated according to a type of data to be transmitted.
  • At least one of the X and Y is a predefined time or a time calculated from a base station or a type of data to be transmitted, and a time interval additionally variable to a fixed time interval, for example, one interval It may be a time interval that varies according to a randomly selected value within.
  • the time intervals represented by X and Y may be interpreted as meaning different channel access procedures or different channel access methods, respectively.
  • the channel sensing method required for determining the idle state of the unlicensed band in performing the first type of channel access procedure and the channel sensing method required for the second type of channel access procedure are differently set.
  • the probability that the unlicensed band is determined to be idle by one type of channel access procedure, or the probability of channel access when the first type of channel access procedure is performed than when the second type of channel access procedure is performed It can be set to be large.
  • the first type of channel access procedure is set to perform the channel sensing operation for a fixed time interval
  • the second type of channel access procedure performs channel sensing operation for the unlicensed band for a randomly selected variable time interval other than the fixed period.
  • the length of the channel sensing interval required when the channel access procedure of the first type is performed is smaller than the length of the channel sensing interval required when the channel access procedure of the second type is performed.
  • the terminal may be configured from the base station via the downlink control channel or uplink scheduling information (or UL grant), including a group common downlink control channel, the channel detection method that the terminal should use when transmitting the uplink signal.
  • the terminal is configured to receive the grant-based uplink transmission scheme from the base station, the unlicensed band in which the terminal performs uplink transmission, and the downlink control channel, which transmits uplink transmission configuration information by the base station, is transmitted. If the band is different (for example, when uplink transmission configuration information is transmitted through a downlink control channel transmitted from a base station or a cell in a licensed band and the set uplink transmission is configured in an unlicensed band), the grant- Even if the terminal is configured based on the uplink transmission scheme, the second type of channel access procedure may be used.
  • the first type of channel access procedure or the second type of channel access procedure may include at least one channel access procedure (hereinafter referred to as a third type channel access procedure) used by a base station for downlink channel access.
  • the parameters required for setting the procedure can be set the same or different.
  • the channel access procedure of the first, second and third types may be performed in a type of channel to be transmitted through the unlicensed band, for example, in an access procedure in a channel for control information transmission and a channel for data information transmission. It may be set differently according to the access procedure of.
  • the first, second and third types of channel access procedures may include not only the type of channels to be transmitted through the unlicensed band but also the length of unlicensed band occupancy time to be used after the channel access procedure. Variables of each of the first, second and third types of channel access procedures may be set differently. In the embodiment of the present invention, the use of different channel access procedures according to the uplink signal transmission scheme of the terminal configured from the base station has been described. However, as mentioned above, the type of the channel to be transmitted or continuously occupies the channel Depending on the length of time to be used, at least one or more of the first, second and third types of channel access procedures may be set to be the same or different.
  • the base station transmits an uplink transmission method (eg, grant-based) used for uplink transmission of the base station or cell to at least one of a higher signal, a broadcast channel, and a downlink control channel.
  • an uplink transmission method eg, grant-based
  • grant-free uplink transmission method may be configured.
  • a variable necessary for uplink transmission according to the uplink transmission method set in step 3f-601 may be additionally set.
  • the base station to the terminal the grant-free uplink transmission method is set, the configuration information on at least one resource region of the time resource region, the frequency resource region in which the grant-free uplink transmission can be performed, It may be transmitted or configured to the terminal through at least one or more of an upper signal, a broadcast channel, and a downlink control channel.
  • the step 3f-602 may be included in 3f-601 and set or transmitted to the terminal.
  • the UE selects not only the time and frequency resource regions but also MCS, information (cyclic shift), TTI length, or candidate values that the UE can select for the variable-free uplink transmission. It may receive some or all of the variables required for uplink transmission configuration, including.
  • the base station changes the parameters of the uplink channel access procedure according to the uplink transmission method configured in step 3f-601 in step 3f-602. Can be set.
  • the base station excludes the uplink transmission scheme set in step 3f-602 in step 3f-604.
  • a variable required for the remaining uplink transmission may be set or a variable necessary for the remaining uplink transmission may be set, including at least one variable of the uplink transmission configuration configured in step 3f-602.
  • the changed uplink configuration information is transmitted to the terminal through a downlink control channel and configured to the terminal.
  • uplink transmission of the terminal may be received.
  • the base station determines in step 3f-606 the grant-free uplink transmission scheme in step 3f-602. According to the configured setting value, it is possible to check whether the terminal is uplink transmission. If a base station or a cell that has configured a grant-free uplink transmission scheme to a terminal through a higher signal or a broadcast channel, the uplink transmission scheme for the terminal at a specific uplink transmission time is temporarily granted as a grant-based scheme. You may want to change it.
  • the base station includes some or all of the uplink transmission scheme configured in step 3f-602 or transmits uplink configuration information set to a new variable value to the terminal through a downlink control channel.
  • the terminal may receive the uplink transmission of the terminal according to the uplink transmission configured to the terminal.
  • a method of setting a channel access procedure according to an uplink signal transmission method of a terminal proposed by the present invention will be described with reference to FIG. 3G as follows.
  • the UE transmits an uplink transmission method (eg, grant-based) used for uplink transmission from the base station to the base station or cell through at least one of an upper signal, a broadcast channel, and a downlink control channel.
  • an uplink transmission method eg, grant-based
  • One of uplink transmission, grant-free uplink transmission method, or grant-based and grant-free uplink transmission method may be configured.
  • the UE may further set a variable value required for uplink transmission from the base station according to the uplink transmission method configured in step 3g-701.
  • the terminal in which the grant-free uplink transmission method is set may include configuration information on at least one resource region of a time resource region and a frequency resource region in which the grant-free uplink transmission may be performed from a base station. It may be received or configured through at least one or more of an upper signal, a broadcast channel, and a downlink control channel.
  • the step 3g-702 may be included in the 3g-701 can be set from the base station.
  • the terminal selects not only the time and frequency resource region but also the MCS, information (cyclic shift), TTI length, or the variable values that the terminal can use for grant-free uplink transmission. Some or all of the variables required for uplink transmission configuration, including candidate values, may be set.
  • the terminal may perform an uplink channel access procedure in step 3g-702 from the base station. Get a variable for.
  • the terminal may perform an uplink channel access procedure in step 3g-702 from the base station. Get a variable for.
  • the terminal may perform an uplink channel access procedure in step 3g-702 from the base station. Get a variable for.
  • at least one or more of the variables related to the uplink channel access procedure set in the step 3g-702 may be set differently.
  • the terminal excludes the uplink transmission scheme set in step 3g-702 in step 3g-704. Receive all or all of the configuration required for uplink transmission or part or all of the uplink transmission scheme set in step 3g-602, or set at least one variable value among the variable values received in step 3g-602 as a new variable value.
  • the uplink configuration information may be received through the downlink control channel of the base station.
  • the terminal performs an uplink channel access procedure according to the uplink transmission received from the base station, and according to the result of the uplink channel access procedure for the unlicensed band, uplink transmission uplink transmission configured in step 3g-704 According to the uplink transmission operation can be performed.
  • the UE determines in step 3g-706 the grant-free uplink transmission scheme in step 3g-702. Performing a channel access procedure for the unlicensed band according to a channel access procedure configured from a base station, and performing an uplink transmission according to the uplink transmission configuration configured in step 3g-702 according to a result of the uplink channel access procedure for the unlicensed band Can be sent.
  • the terminal may perform uplink transmission according to the uplink channel access procedure and uplink transmission configuration newly received from the downlink control channel of the base station in step 3g-707.
  • the uplink channel access procedure of the terminal follows the scheme set in step 3g-702, and only uplink transmission configuration information may perform uplink transmission according to the uplink transmission configuration newly received in step 3g-707.
  • the terminal and the base station may each include a transmitter, a receiver, and a processor.
  • a method of transmitting and receiving a base station and a terminal is shown to determine the timing of transmission and reception of a second signal and to perform an operation according thereto, and the transmitter, the receiver, and the processor may perform the operation.
  • the transmitting unit and the receiving unit may be referred to as a transmitting and receiving unit capable of performing both functions, and the processing unit may be referred to as a control unit.
  • 3H is a block diagram illustrating a structure of a terminal according to an embodiment.
  • a terminal of the present invention may include a terminal receiver 3h-800, a terminal transmitter 3h-804, and a terminal processor 3h-802.
  • the terminal receiver 3h-800 and the terminal may collectively be referred to as a transmitter / receiver in the embodiment.
  • the transceiver of the terminal may transmit and receive signals with the base station.
  • the signal may include control information and data.
  • the transmitting and receiving unit of the terminal 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 strength of the signal received through the wireless channel of the transceiver unit of the terminal is measured and output to the terminal processor 3h-802, and the terminal processor 3h-802 compares the strength of the received signal with a preset threshold value.
  • the channel access operation may be performed, and a signal output from the terminal processor 3h-802 may be transmitted through the wireless channel according to the channel access operation result.
  • the transceiver unit of the terminal may receive a signal through a wireless channel and output the signal to the terminal processor 3h-802 and transmit a signal output from the terminal processor 3h-802 through a wireless channel.
  • the terminal processor 3h-802 may control a series of processes to operate the terminal according to the above-described embodiment.
  • the terminal receiving unit 3h-800 may receive a signal including the second signal transmission timing information from the base station, and the terminal processing unit 3h-802 may control to interpret the second signal transmission timing. Thereafter, the terminal transmitter 3h-804 may transmit the second signal at the timing.
  • 3I is a block diagram illustrating a structure of a base station according to an embodiment.
  • the base station may include at least one of the base station receivers 3i-901, the base station transmitters 3i-905, and the base station processor 3i-903.
  • the base station receiver 3i-901 and the base station transmitter 3i-905 may be collectively referred to as a transmitter / receiver.
  • the transceiver of the base station may transmit and receive signals with the terminal.
  • the signal may include control information and data.
  • the transceiver unit of the base station may be configured with 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 unit of the base station may receive a signal through a wireless channel and output the signal to the base station processor 3i-903, and transmit the signal output from the terminal processor 3i-903 through the wireless channel.
  • the base station processor 3i-903 may control a series of processes to operate the base station according to the above-described embodiment of the present invention. For example, the base station processor 3i-903 may determine the second signal transmission timing and control to generate the second signal transmission timing information to be transmitted to the terminal. Thereafter, the base station transmitter 3i-905 transmits the timing information to the terminal, and the base station receiver 3i-901 may receive a second signal at the timing.
  • the base station processor 3i-903 sets the uplink transmission scheme of the terminal to use at least one of the grant-free and grant-based schemes, and according to the configured uplink transmission scheme.
  • the base station transmitter 3i-905 may transmit configuration information about uplink transmission to the terminal.
  • the base station processor 3i-903 may control to generate downlink control information (DCI) including the second signal transmission timing information.
  • DCI downlink control information
  • the DCI may indicate that the second signal transmission timing information.

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

Abstract

La présente invention concerne une technique de communication pour fusionner, avec technologie IoT (Internet des objets), un système de communication 5G pour supporter 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 habitation 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, etc.) sur la base de la technologie de communication 5G et de technologies connexes à l'IoT. La présente invention concerne un système de communication sans fil ainsi qu'un procédé et un dispositif pour transmettre un signal de commande de liaison montante ou un signal de données. Plus particulièrement, la présente invention concerne un procédé de transmission pour un terminal capable de réaliser une transmission de liaison montante à un ou plusieurs moments en réponse à une transmission ou une planification de signal de données de liaison descendante.
PCT/KR2017/011028 2016-09-29 2017-09-29 Procédé et dispositif pour transmettre des signaux de commande en liaison montante et de données dans un système de communication cellulaire sans fil WO2018062961A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2016-0125185 2016-09-29
KR20160125185 2016-09-29
KR10-2017-0036877 2017-03-23
KR1020170036877A KR102288064B1 (ko) 2016-09-29 2017-03-23 무선 셀룰라 통신 시스템에서 상향링크 제어 및 데이터 신호 전송 방법 및 장치

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US11523415B2 (en) 2018-04-05 2022-12-06 Electronics And Telecommunications Research Institute Method and apparatus for uplink transmission in communication system
US11711798B2 (en) 2018-04-05 2023-07-25 Electronics And Telecommunications Research Institute Method and apparatus for uplink transmission in communication system
US11930534B2 (en) 2018-04-11 2024-03-12 Electronics And Telecommunications Research Institute Method and device for low latency communication in communication system

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