KR20200127826A - Method and apparatus for transmission and reception of data channel in wireless communication system - Google Patents

Abstract

The present disclosure relates to a method and apparatus for transmitting and receiving a data channel and control information in a wireless communication system. More specifically, the present disclosure relates to a method of configuring an uplink data channel region and uplink control information in a wideband unlicensed band. More specifically, a method of changing or reconfiguring an uplink data channel region and uplink control information setting and location in consideration of occupied subbands is proposed. According to the present disclosure, a method for a terminal to set an uplink data channel in an unlicensed band in a wireless communication system comprises the steps of: receiving information on data channel setting from a base station; setting an uplink data channel region based on the information on data channel setting; and transmitting data including setting uplink control information to the base station through the set uplink data channel region.

Description

Method and apparatus for transmitting and receiving data channels in wireless communication system {METHOD AND APPARATUS FOR TRANSMISSION AND RECEPTION OF DATA CHANNEL IN WIRELESS COMMUNICATION SYSTEM}

The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving data and control information in a wireless communication system. More specifically, the present disclosure relates to a wireless communication system, in particular, a system for transmitting an uplink signal in an unlicensed band, and a system for receiving a node or a downlink signal, and a method for setting a downlink data channel region and control information transmission in the node. will be.

In order to meet the demand for wireless data traffic that is explosively increasing due to the commercialization of 4G communication systems and the increase in multimedia services, an improved 5G communication system or pre-5G communication system is being developed. For this reason, the 5G communication system or the pre-5G communication system is called a communication system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE).

In order to increase the data rate, the 5G communication system is being considered for implementation in an ultra high frequency (mmWave) band (eg, a 60 gigabyte (60 GHz) band). In order to mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, in 5G communication systems, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, in order to improve the network performance of the system, in 5G communication systems, advanced small cells, advanced small cells, cloud radio access networks (cloud RAN), and ultra-dense networks (ultra-dense networks) network), Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation (interference) cancellation) and other technologies are being developed. In addition, in the 5G system, advanced coding modulation (ACM) methods such as Hybrid FSK and QAM Modulation (FQAM) and SWSC (Sliding Window Superposition Coding), advanced access technologies such as Filter Bank Multi Carrier (FBMC), NOMA (non orthogonal multiple access), and sparse code multiple access (SCMA) have been developed.

Meanwhile, the Internet is evolving from a human-centered network in which humans generate and consume information, to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology 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 objects, machine to machine , M2M), and MTC (Machine Type Communication) technologies are being studied. In the IoT environment, intelligent IT (Internet Technology) services that create new value in human life by collecting and analyzing data generated from connected objects can be provided. IoT is the field of smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart home appliance, advanced medical service, etc. through the convergence and combination of existing IT (information technology) technology and various industries. Can be applied to.

Accordingly, various attempts have been made to apply a 5G communication system to an IoT network. For example, technologies such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication) are implemented by techniques such as beamforming, MIMO, and array antenna. There is. As the big data processing technology described above, a cloud radio access network (cloud RAN) is applied as an example of the convergence of 5G technology and IoT technology.

The present disclosure relates to a method and apparatus for transmitting and receiving a data channel and setting control information in a wireless communication system. In an embodiment of the present disclosure, in a system and node for receiving a downlink signal through an unlicensed band or a system and node for transmitting an uplink signal, a method for setting an uplink data channel region and setting and configuring uplink control information Present.

A method and apparatus for transmitting and receiving a data channel in a wireless communication system according to an embodiment comprises: receiving information on data channel setting from a base station, and setting up an uplink data channel region based on the information on data channel setting. And transmitting data including setting uplink control information to the base station through the set uplink data channel region.

FIG. 1 is a diagram illustrating an uplink and downlink time-frequency domain transmission structure of an NR or 5G communication system according to an embodiment of the present disclosure.
2 is a diagram for describing a channel access procedure in an unlicensed band according to an embodiment of the present disclosure.
3 is a diagram illustrating a resource region through which a data channel is transmitted in an NR or 5G communication system according to an embodiment of the present disclosure.
4 is a diagram illustrating an example of setting a control region of a downlink control channel in an NR or 5G communication system according to an embodiment of the present disclosure
5 is a diagram illustrating a structure of a downlink control channel in an NR or 5G communication system according to an embodiment of the present disclosure.
6 is a diagram illustrating an example of transmitting an uplink signal without uplink scheduling information in an unlicensed band according to an embodiment of the present disclosure.
FIG. 7 is a diagram illustrating an example of configuring uplink signal transmission in a guard band when a terminal transmits uplink in a broadband unlicensed band according to an embodiment of the present disclosure.
FIG. 8 is a diagram illustrating an example of configuring uplink signal transmission in a guard band when a terminal transmits uplink in a wideband unlicensed band according to an embodiment of the present disclosure.
FIG. 9 is a diagram illustrating an example in which a terminal performs a channel access procedure in units of subbands and transmits a result of performing the channel access procedure for each subband to a base station in a broadband unlicensed band according to an embodiment of the present disclosure.
10 is a diagram illustrating an example in which a terminal determines a location of uplink control information in a slot in which uplink transmission is performed in a broadband unlicensed band according to an embodiment of the present disclosure.
11 is a diagram illustrating an example in which a terminal changes a location of uplink control information according to an embodiment of the present disclosure.
12 is a flowchart illustrating an operation of a base station according to an embodiment of the present disclosure.
13 is a flowchart illustrating an operation of a terminal according to an embodiment of the present disclosure.
14 is a diagram illustrating an example of receiving a downlink signal or transmitting an uplink signal when a terminal according to an embodiment of the present disclosure fails to receive a DCI indicating a slot format.
15 is a block diagram illustrating a structure of a base station according to an embodiment of the present disclosure.
16 is a block diagram illustrating a structure of a terminal according to an embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail together with the accompanying drawings. In addition, in describing the present disclosure, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present disclosure, the detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present disclosure and may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout this specification.

Advantages and features of the present disclosure, and a method of achieving them will be apparent with reference to embodiments described later in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, and only these embodiments make the disclosure of the present disclosure complete, and common knowledge in the technical field to which the disclosure belongs. It is provided to fully inform the holder of the scope of the disclosure, and the present disclosure is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present disclosure belongs and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure by omitting unnecessary description.

For the same reason, some components in the accompanying drawings are exaggerated, omitted, or schematically illustrated. In addition, the size of each component does not fully reflect the actual size. The same reference numerals are assigned to the same or corresponding components in each drawing.

Advantages and features of the present disclosure, and a method of achieving them will be apparent with reference to embodiments described later in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, and only these embodiments make the disclosure of the present disclosure complete, and common knowledge in the technical field to which the disclosure belongs. It is provided to fully inform the holder of the scope of the disclosure, and the present disclosure is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

At this time, it will be appreciated that each block of the flowchart diagrams and combinations of the flowchart diagrams may be executed by computer program instructions. Since these computer program instructions can be mounted on the processor of a general purpose computer, special purpose computer or other programmable data processing equipment, the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). It creates a means to perform functions. These computer program instructions can also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, so that the computer-usable or computer-readable memory It is also possible to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block(s). Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so that a series of operating steps are performed on a computer or other programmable data processing equipment to create a computer-executable process to create a computer or other programmable data processing equipment. It is also possible for instructions to perform processing equipment to provide steps for executing the functions described in the flowchart block(s).

In addition, each block may represent a module, segment, or part of code that contains one or more executable instructions for executing the specified logical function(s). In addition, it should be noted that in some alternative execution examples, functions mentioned in blocks may occur out of order. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order depending on the corresponding function.

In this case, the term'~ unit' used in the present embodiment means software or hardware components such as FPGA or ASIC, and'~ unit' performs certain roles. However,'~ part' is not limited to software or hardware. The'~ unit' may be configured to be in an addressable storage medium, or may be configured to reproduce one or more processors. Thus, as an example,'~ unit' refers to components such as software components, object-oriented software components, class components and task components, processes, functions, properties, and procedures. , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, database, data structures, tables, arrays, and variables. The components and functions provided in the'~ units' may be combined into a smaller number of elements and'~ units', or may be further divided into additional elements and'~ units'. In addition, components and'~ units' may be implemented to play one or more CPUs in a device or a security multimedia card. Also, in an embodiment,'~ unit' may include one or more processors.

The 5G system is considering supporting various services compared to the existing 4G system. For example, the most representative services are mobile ultra-wide band communication service (eMBB: enhanced mobile broad band), ultra-reliable and low latency communication service (URLLC: ultra-reliable and low latency communication), and large-scale device-to-device communication service (mMTC: massive machine type communication), evolved multimedia broadcast/multicast service (eMBMS), and the like. In addition, a system that provides the URLLC service may be referred to as a URLLC system, and a system that provides an eMBB service may be referred to as an eMBB system. In addition, the terms service and system may be used interchangeably.

In this way, a plurality of services may be provided to users in a communication system, and in order to provide such a plurality of services to users, a method of providing each service within the same time period according to characteristics and an apparatus using the same are required. I can.

According to an embodiment of the present disclosure, by setting an uplink data channel region and control information in consideration of a subband in a system and a node for receiving a downlink signal or a system and node for transmitting an uplink signal in a wireless communication system, , It is possible to improve the uplink data channel reception and frequency use efficiency.

Meanwhile, in a wireless communication system, for example, an LTE or LTE-A system, or a 5G New Radio (NR) system, a downlink signal transmitted from the base station to the terminal through a downlink control channel (PDCCH) is Downlink control information (Downlink Control Information (DCI)) including transmitted resource allocation information, etc., is transmitted to the terminal to provide downlink control information (e.g., Channel-State Information Reference Signal (CSI-RS)), or a broadcast channel. (Physical Broadcast CHannel (PBCH), or downlink data channel (Physical Downlink Shared CHannel (PDSCH)) at least one or more downlink signals can be set to receive.

For example, the base station may transmit downlink control information (DCI) instructing the UE to receive the PDSCH in subframe n through the PDCCH in subframe n. The terminal receiving the downlink control information (DCI) may receive the PDSCH in subframe n according to the received downlink control information. In addition, in an LTE or LTE-A or NR system, the base station may transmit downlink control information (DCI) including uplink resource allocation information to the terminal through a downlink control channel (PDCCH). The base station uses uplink control information (e.g., Sounding Reference Signal (SRS) or Uplink Control Information (UCI), or Physical Random Access CHannel (PRACH)) or an uplink data channel (Physical Uplink Shared). CHannel (PUSCH)) can be configured to transmit at least one uplink signal to the base station. For example, the terminal receiving the uplink transmission configuration information (or uplink DCI or UL grant) transmitted through the PDCCH from the base station in subframe n, a predefined time (eg, n+4) or Or uplink data channel transmission according to a time set through an upper signal (eg, n+k) or uplink signal transmission time indicator information (eg, n+k) included in the uplink transmission configuration information (Hereinafter, PUSCH transmission) can be performed.

If the configured downlink transmission is transmitted from the base station to the terminal through the unlicensed band, or when the configured uplink transmission is transmitted from the terminal to the base station through the unlicensed band, the transmitting device (base station or terminal) is before or immediately before the set signal transmission start time. If the channel access procedure (LBT: listen-before talk) is performed for the unlicensed band in which the signal transmission is set, and if it is determined that the unlicensed band is in the idle state according to the result of the channel access procedure, unlicensed It is possible to perform set signal transmission by accessing the band.

If it is determined that the unlicensed band is not idle or occupied according to the result of the channel access procedure performed by the transmitting device, the transmitting device cannot access the unlicensed band. It may be impossible to perform transmission of the set signal.

In general, the channel access procedure in the unlicensed band in which signal transmission is configured may be as follows. The transmitting device may receive a signal in the unlicensed band for a predetermined time or a time calculated according to a predefined rule (eg, at least a time calculated through a random value selected by the base station or the terminal). The transmitting device is calculated by a function consisting of at least one variable among a channel bandwidth or a bandwidth of a signal to which a signal to be transmitted is transmitted, a transmission power intensity, a beam width of a transmitted signal, etc. The idle state of the unlicensed band can be determined by comparing it with the threshold value.

For example, when the strength of a signal received for 25us from the transmitting device is less than a predefined threshold value of -72dBm, the transmitting device may determine that the unlicensed band is in an idle state, and may perform a set signal transmission. At this time, the maximum possible time for signal transmission depends on the maximum channel occupancy time defined for each country or region in the unlicensed band or the type of transmission device (for example, a base station or terminal, or a master device or a slave device). May be limited. For example, in Japan, in the 5GHz unlicensed band, after performing the channel access procedure, the base station or the terminal may occupy a channel and transmit a signal without performing an additional channel access procedure for up to 4 ms. If the strength of the signal received during 25us is greater than the predefined threshold -72dBm, the transmitting device, for example, the base station may determine that the unlicensed band is not in an idle state and may not transmit the signal.

In the case of a 5G communication system, various technologies such as retransmission in units of a code block group and a technology capable of transmitting an uplink signal without uplink scheduling information have been introduced to provide various services and support a high data rate. Therefore, when 5G communication is to be performed through an unlicensed band, a more efficient channel access procedure in consideration of various variables may be required.

The wireless communication system deviated from the initial voice-oriented service, for example, 3GPP HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced. (LTE-A), 3GPP2's High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE's 802.16e, such as communication standards, developed into a broadband wireless communication system that provides high-speed, high-quality packet data services. Are doing. In addition, a communication standard of 5G or NR (new radio) is being created as a 5th generation wireless communication system.

In this way, in a wireless communication system including the 5th generation, at least one service of eMBB (Enhanced mobile broadband), mMTC (massive Machine Type Communications) (mMTC), and URLLC (Ultra-Reliable and low-latency Communications) can be provided to the terminal. have. Services may be provided to the same terminal during the same time period. In an embodiment, eMBB may be a service for high-speed transmission of high-capacity data, mMTC may be a service aiming at minimizing terminal power and accessing multiple terminals, and URLLC for high reliability and low latency, 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.

When the base station schedules data corresponding to the eMBB service to a certain terminal in a specific transmission time interval (TTI), when a situation in which the URLLC data needs to be transmitted in the TTI occurs, the eMBB data is already scheduled and transmitted. It is possible to transmit generated URLLC data in the frequency band without transmitting part of the eMBB data in the existing frequency band. The eMBB-scheduled terminal and the URLLC-scheduled terminal may be the same terminal or different terminals. In such a case, the possibility of damage to the eMBB data increases because a portion of the eMBB data that has already been scheduled and transmitted is not transmitted. Therefore, in a case, a method of processing a signal received from a terminal that has been scheduled for eMBB or a terminal that has been scheduled for URLLC and a method of receiving a signal needs to be determined.

Hereinafter, embodiments of the present disclosure will be described in detail together with the accompanying drawings. In addition, in describing the present disclosure, when it is determined that a detailed description of a related function or configuration may unnecessarily obscure the subject matter of the present disclosure, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present disclosure and may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout this specification. Hereinafter, the base station 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 as a subject performing resource allocation of the terminal. 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. In the present disclosure, a downlink (DL) may refer to a wireless transmission path of a signal transmitted from a base station to a terminal, and an uplink (UL) refers to a wireless transmission path of a signal transmitted from the terminal to the base station. can do. In addition, hereinafter, an embodiment of the present disclosure will be described using an LTE or LTE-A system as an example, but an embodiment of the present disclosure may be applied to other communication systems having a similar technical background or channel type. For example, 5G mobile communication technology (5G, new radio, NR) developed after LTE-A may be included. In addition, the embodiments of the present disclosure may be applied to other communication systems through some modifications without significantly departing from the scope of the present disclosure, as determined by a person having skilled technical knowledge.

As a representative example of the above-described broadband wireless communication system, an NR system employs an Orthogonal Frequency Division Multiplexing (OFDM) scheme in a downlink (DL), and an OFDM and Single Carrier (SC-FDMA) scheme in an uplink (UL). Frequency Division Multiple Access) is adopted. The uplink can mean a radio link through which a terminal (terminal or user equipment, UE) or a mobile station ((MS) transmits data or control signals to a base station (eNode B, or base station (BS)), and downlink May mean a radio link through which the base station transmits data or control signals to the terminal.In the multiple access method as described above, in general, time-frequency resources for carrying data or control information for each user do not overlap each other, that is, Each user's data or control information can be classified by assigning and operating so that orthogonality is established.

When a decoding failure occurs in initial transmission, the NR system may employ a hybrid automatic repeat request (HARQ) scheme in which the corresponding data is retransmitted in the physical layer. In the HARQ scheme, when the receiver fails to accurately decode (decode) data, the receiver transmits information (Negative Acknowledgement) notifying the transmitter of the decoding failure to enable the transmitter to retransmit the corresponding data in the physical layer. The receiver may improve data reception performance by combining data retransmitted by the transmitter with data that has previously failed to be decoded. In addition, when the receiver correctly decodes data, information (ACK) notifying the transmitter of decoding success may be transmitted to enable the transmitter to transmit new data.

FIG. 1 is a diagram illustrating an uplink and downlink time-frequency domain transmission structure of an NR or 5G communication system according to an embodiment of the present disclosure. More specifically, FIG. 1 is a diagram for explaining the basic structure of a time-frequency domain, which is a radio resource domain in which the above-described data or control channel is transmitted in an uplink/downlink of an NR system or a similar system.

Referring to FIG. 1, 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 to DFT-s-OFDM symbol, and N _symb (101) OFDM to DFT-s-OFDM symbols may be collected to form one slot 102. Here, the OFDM symbol may mean a symbol for transmitting and receiving a signal using an OFDM multiplexing scheme, and the DFT-s-OFDM symbol is for transmitting and receiving a signal using a DFT-s-OFDM or SC-FDMA multiplexing scheme. It may mean a symbol for. In the present disclosure, for convenience of explanation, OFDM and DFT-s-OFDM symbols will be commonly used as OFDM symbols without distinction, and will be described based on downlink signal transmission and reception, but the present disclosure is also applied to uplink signal transmission and reception. What is possible will be fully understood by those skilled in the art.

When the interval between subcarriers is 15 kHz, one slot may be gathered to form one subframe 103, and the lengths of the aforementioned slots and subframes may be 1 ms, respectively. In this case, the number of slots and the length of the slots constituting one subframe 103 may be different according to the interval between subcarriers. For example, when the interval between subcarriers is 30 kHz, four slots may be gathered to form one subframe 103. In this case, the length of the slot may be 0.5 ms and the length of the subframe may be 1 ms.

The radio frame 104 may be a time domain section consisting of 10 subframes. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth may consist of a total of N _BW (105) subcarriers. However, these specific values can be applied variably. For example, in the case of an LTE system, the interval between subcarriers is 15 kHz, but two slots are gathered to form one subframe 103, in which case the length of the slot is 0.5 ms and the length of the subframe is 1 ms.

The basic unit of a resource in the time-frequency domain is a resource element (RE) 106, which can be represented by an OFDM symbol index and a subcarrier index. The resource block 107 (Resource Block; RB or Physical Resource Block; PRB) may be defined as N _symb (101) consecutive OFDM symbols in the time domain and N _SC ^RB (108) consecutive subcarriers in the frequency domain. . Therefore, one RB 107 in one slot is N _symb ×N _SC ^RB may contain REs. In general, the minimum allocation unit in the frequency domain of data may be the RB 107. In an NR system, in general, N _symb = 14 and N _SC ^RB = 12, and the number of _RBs (N _RB ) may vary according to the bandwidth of the system transmission band. In the LTE system, in general, N _symb = 7, N _SC ^RB = 12, and N _RB may vary according to the bandwidth of the system transmission band.

The downlink control information may be transmitted within the first N OFDM symbols in the above-described subframe. In general, it may be N = {1, 2, 3}, and the terminal may receive the number of symbols through which downlink control information can be transmitted from the base station through an upper signal. In addition, according to the amount of control information to be transmitted in the current slot, the base station may vary the number of symbols in which downlink control information can be transmitted in the slot for each slot, and separately downlink information on the number of symbols described above. It can be delivered to the terminal through the link control channel.

In the NR to LTE system, scheduling information for downlink data or uplink data may be transmitted from the base station to the terminal through downlink control information (DCI). DCI can be defined according to various formats. For example, DCI according to each format is whether scheduling information (UL grant) for uplink data or scheduling information (DL grant) for downlink data, compact DCI with a small size of control information, control information It may indicate whether it is fall-back DCI, whether spatial multiplexing using multiple antennas is applied, whether DCI is for power control, and the like. For example, the DCI format (for example, DCI format 1_0 of NR), which is scheduling control information (DL grant) for downlink data, may include at least one of the following control information.

-Control information identifier (DCI format identifier): Identifier that identifies the received DCI format

-Frequency domain resource assignment: indicates the RB allocated for data transmission.

-Time domain resource assignment: indicates slots and symbols allocated for data transmission.

-VRB-to-PRB mapping: indicates whether to apply the VRB mapping method

-Modulation and coding scheme (MCS): Indicate the modulation method used for data transmission and the size of the transport block, which is the data to be transmitted.

-New data indicator: indicates whether HARQ initial transmission or retransmission.

-Redundancy version: indicates a redundancy version of HARQ.

-HARQ process number: indicates the process number of HARQ.

-PDSCH allocation information (Downlink assignment index): Indicate the number of PDSCH reception results to be reported to the base station to the terminal (eg, the number of HARQ-ACKs)

-Transmit Power Control (TPC) command for PUCCH (Physical Uplink Control CHannel) (PUCCH): Indicates a transmit power control command for PUCCH, which is an uplink control channel.

-PUCCH resource indicator (PUCCH resource indicator): PUCCH resource indication used for HARQ-ACK report including the reception result for the PDSCH configured through the corresponding DCI

-PUCCH transmission timing indicator (PDSCH-to-HARQ_feedback timing indicator): indicates slot or symbol information in which PUCCH should be transmitted for HARQ-ACK reporting including a reception result for the PDSCH configured through the corresponding DCI

The above-described DCI is a downlink physical downlink control channel (PDCCH) (or control information, hereinafter to be used in combination) or EPDCCH (Enhanced PDCCH) (or enhanced control information, which is a downlink physical control channel through channel coding and modulation processes). It can be transmitted on the following mixed use).

In general, DCI is scrambled with a specific Radio Network Temporary Identifier (RNTI) (or, a terminal identifier C-RNTI (Cell RNTI)) independently for each terminal to add a cyclic redundancy check (CRC), and after channel coding, each independently In the time domain, the PDCCH can be mapped and transmitted during the control channel transmission period The frequency domain mapping position of the PDCCH can be determined by the ID of each terminal, and the entire system is transmitted. It can be spread over the band and transmitted.

Downlink data may be transmitted on a physical downlink shared channel (PDSCH), which is a physical channel for transmitting downlink data. The PDSCH may be transmitted after the above-described control channel transmission period, and scheduling information such as a specific mapping position and modulation scheme in the frequency domain may be determined based on the DCI transmitted through the PDCCH.

Among the control information constituting the above-described DCI, through the MCS, the base station may notify the terminal of the modulation method applied to the PDSCH to be transmitted and the size of the data to be transmitted (transport block size (TBS)). In an embodiment, the MCS may consist of 5 bits or more or less bits. The TBS may correspond to a size before channel coding for error correction is applied to data (transport block, TB) intended to be transmitted by the base station.

Modulation methods supported by the NR system may include Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (16QAM), 64QAM, and 256QAM, and each of the modulation orders (Qm) is 2, 4, 6 to be. That is, in the case of QPSK modulation, 2 bits per symbol, in the case of 16QAM modulation, 4 bits per symbol, in the case of 64QAM modulation, 6 bits per symbol, and in the case of 256QAM modulation, 8 bits per symbol can be transmitted. In addition, a modulation scheme of 256QAM or more may be used according to system modifications.

In the NR system, the uplink/downlink HARQ employs an asynchronous HARQ scheme in which data retransmission time is not fixed. In the example of downlink, when a HARQ NACK is fed back from the terminal for initial transmission data transmitted by the base station, the base station can freely determine the transmission time of the retransmission data by the scheduling operation. The terminal performs decoding on received data for the HARQ operation, and as a result, buffers the data determined to be erroneous, and then performs combining with data retransmitted from the base station. HARQ ACK/NACK information of the PDSCH transmitted in subframe n-k may be transmitted from the terminal to the base station through PUCCH or PUSCH in subframe n. In a 5G communication system such as NR, the k value described above may be included in the DCI indicating or scheduling reception of the PDSCH transmitted in the subframe nk and transmitted, or the k value may be set to the terminal through an upper signal. have. In this case, the base station may set one or more k values as higher signals and may indicate a specific k value through DCI. In this case, k may be determined according to the HARQ-ACK processing capability of the UE, that is, the minimum time required for the UE to receive the PDSCH and generate and report the HARQ-ACK for the PDSCH. In addition, the terminal can use a predefined value or a default value until the k value is set.

Hereinafter, the description of the wireless communication system and the method and apparatus proposed in the embodiment of the present disclosure have been described based on the NR system, but the content of the present disclosure is not limited to the NR system, but LTE, LTE-A , LTE-A-Pro, 5G, etc. can be applied in various wireless communication systems. In addition, although the present disclosure has been described based on a system and a device that transmits and receives signals using an unlicensed band, the contents of the present disclosure may be applied to a system operating in a licensed band.

Hereinafter, in the present disclosure, the higher signaling or higher signal may be a signal transmission method transmitted from the base station to the terminal using the downlink data channel of the physical layer, or from the terminal to the base station using the uplink data channel of the physical layer. It may include signaling, or PDCP signaling, or a signal transmission method delivered through a MAC control element (MAC CE). In addition, the above-described higher signaling or higher signal may include system information commonly transmitted to a plurality of terminals, for example, a system information block (SIB).

In a system that performs communication in an unlicensed band, a transmitting device (base station or terminal) that intends to transmit a signal through the unlicensed band is a channel access procedure for an unlicensed band to perform communication before transmitting the above-described signal. procedure, or LBT: listen-before talk) can be performed. When it is determined that the above-described unlicensed band is idle according to the channel access procedure, the transmitting device may access the unlicensed band and perform signal transmission. If it is determined that the unlicensed band is not idle according to the performed channel access procedure, the transmitting device may not be able to perform signal transmission.

In the channel access procedure in the unlicensed band, in general, the transmitting device is for a fixed time or a time calculated according to a predefined rule (e.g., a time calculated through at least one random value selected by the base station or the terminal). The strength of the signal received through the above-described unlicensed band can be measured. The transmitting device is a threshold value that is defined in advance or calculated by a function that determines the magnitude of the received signal strength consisting of at least one variable from among the channel bandwidth, the bandwidth of the signal to which the signal to be transmitted is transmitted, the strength of the transmission power, etc. By comparing with (threshold), it is possible to determine the idle state of the above-described unlicensed band.

For example, the transmitting device measures the strength of the signal during Xus (e.g. 25us) just before the time it is intended to transmit the signal, and the measured signal strength is a predefined or calculated threshold T (e.g. -72dBm). ), it is determined that the above-described unlicensed band is in an idle state, and a set signal may be transmitted. At this time, after the channel access procedure, the maximum time for continuous signal transmission may be limited according to the maximum channel occupancy time defined for each country, region, and frequency band according to each unlicensed band. It may also be limited according to the type of (for example, a base station or a terminal, or a master device or a slave device). For example, in Japan, in a 5GHz unlicensed band, a base station or a terminal transmits a signal by occupying the above-described channel without performing an additional channel access procedure for a maximum of 4 ms for an unlicensed band determined to be idle after performing a channel access procedure. I can.

More specifically, when a base station or a terminal wants to transmit a downlink or uplink signal in an unlicensed band, a channel access procedure that can be performed by the base station or terminal may be classified into at least the following types and described.

-Type 1: Up/down link signal transmission after performing channel access procedure for variable time

-Type 2: Uplink/downlink signal transmission after performing channel access procedure for a fixed time

-Type 3: Transmission of downlink or uplink signals without performing a channel access procedure

In the present disclosure, a case in which a base station transmits a downlink signal to a terminal through an unlicensed band and a case in which the terminal transmits an uplink signal to a base station through an unlicensed band will be described in combination. However, the content proposed in this disclosure can be applied in the same manner or partially modified when the terminal transmits an uplink signal to the base station through an unlicensed band or when the base station transmits a downlink signal to the terminal through an unlicensed band. . Therefore, detailed description of transmission and reception of downlink signals will be omitted. In addition, in the present disclosure, it is assumed that one downlink data information (codeword or TB) or uplink data information is transmitted and received between a base station and a terminal. However, the content proposed in the present disclosure may be applicable to a case where a base station transmits a downlink signal to a plurality of terminals, or when a plurality of codewords or TBs are transmitted and received between the base station and the terminal.

A transmitting node (hereinafter referred to as a base station or a terminal) that wants to transmit a signal in an unlicensed band may determine a channel access procedure method according to the type of signal to be transmitted. For example, when the base station wants to transmit a downlink signal including a downlink data channel in an unlicensed band, the base station may perform a Type 1 channel access procedure. And when the base station wants to transmit a downlink signal that does not include a downlink data channel in an unlicensed band, for example, when it wants to transmit a synchronization signal or a downlink control channel, the base station performs a type 2 channel access procedure. And transmit the downlink signal described above.

At this time, the base station may determine the channel access procedure method according to the transmission length of the signal to be transmitted in the unlicensed band, the time or the length of the interval used by occupying the above-described unlicensed band. In general, the Type 1 method may have to perform the channel access procedure for a longer time than the Type 2 method. Accordingly, when the base station wants to transmit a signal for a short time period or a time period less than or equal to a reference time (eg, Xms or Y symbol), the base station may perform a Type 2 channel access procedure. On the other hand, the base station may perform a Type 1 channel access procedure when it wants to transmit a signal during a time period exceeding or exceeding a long time period or a reference time (eg, Xms or Y symbol). In other words, the base station may perform different channel access procedures according to the use time of the unlicensed band.

If, in the case of performing the Type 1 channel access procedure according to at least one of the above-described criteria, the base station is the type of channel access priority according to the quality of service class identifier (QCI) of the signal to be transmitted in the above-described unlicensed band ( channel access priority class), and for the determined channel access priority type, a channel access procedure may be performed by using at least one or more values among predefined setting values as shown in Table 1. For example, QCI 1, 2, and 4 may mean QCI values for services such as Conversational Voice, Conversational Video (Live Streaming), and Non-Conversational Video (Buffered Streaming), respectively. If a signal for a service that does not match the QCI in Table 1 is to be transmitted to the unlicensed band, the base station may select the service described above and the QCI closest to the QCI in Table 1 and select a channel access priority type for this. .

Table 1 is a table showing the mapping relationship between Channel Access Priority Classes and QCI.

[Table 1]

For example, with reference to Table 2 described below, the base station determines a set of values or sizes (CW_p) and contention windows according to the determined channel access priority (p). The minimum and maximum values (CW_min,p, CW_max,p), and the maximum channel occupancy period (T_mcot,p) can be determined through Table 2. In other words, a base station that wants to transmit a downlink signal in the unlicensed band may perform a channel access procedure for the unlicensed band for a minimum of T_f + m_p*T_sl time.

When performing the channel access procedure with the channel access priority type 3 (p=3), the size of the delay interval required to perform the above-described channel access procedure is T_f + m_p*T_sl by using m_p=3. Can be set. If it is determined that the unlicensed band is idle in all of the above-described m_p*T_sl times, N=N-1 may be obtained. In this case, N may be selected as an arbitrary integer value among values between 0 and the value of the contention period (CW_p) at the time point in which the channel access procedure is performed. Referring to Table 2, in the case of channel access priority type 3, the minimum contention interval value and the maximum contention interval value are 15 and 63, respectively. When it is determined that the unlicensed band is idle in the above-described delay interval and the additional channel access procedure execution interval, the base station may transmit a signal through the unlicensed band for a time T_mcot,p (8 ms).

Table 2 is a table showing a channel access priority class in the downlink. In the present disclosure, for convenience of description, a downlink channel access priority class will be used. However, in the case of uplink, the channel access priority class of Table 2 may be reused, or a channel access priority class for uplink transmission may be defined and used.

[Table 2]

The initial contention section value (CW_p) may be the minimum value (CW_min,p) of the contention section. The base station selecting the above-described N value may perform a channel access procedure in the T_sl interval. When the base station determines that the unlicensed band is idle through the channel access procedure performed in the above-described T_sl section, the base station changes the value to N=N-1, and when N=0, the base station transmits the signal through the unlicensed band at maximum T_mcot, The signal can be transmitted for p time. If the unlicensed band determined through the channel access procedure at time T_sl is not in an idle state, the base station may perform the channel access procedure again without changing the N value.

The value of the contention period (CW_p) is the most recently transmitted through the unlicensed band by the base station at the time when the base station initiates the channel access procedure, or at the time when the base station selects the N value to perform the channel access procedure, or immediately before that time. During a downlink signal transmission period (or MCOT), it may be changed based on a reception result for a downlink data channel in a reference subframe or a reference slot. In other words, the base station receives the reception result of the terminal for the downlink data transmitted in the reference subframe or the reference slot, and among the received reception results, increases or minimizes the size of CW_p according to the NACK ratio (Z). I can.

2, the contention period change reference slot for the channel access procedure 270 is a time point 270 at which the base station initiates a channel access procedure, or an N value for the base station to perform the channel access procedure. It may be the first transmission period 240 (hereinafter, a slot or subframe) of the most recently transmitted downlink signal transmission period 230 through the unlicensed band at the time of selecting or immediately before.

When the base station cannot report and receive the reception result for the downlink data channel transmitted in the first slot 240 of the transmission interval 230, the most recent downlink signal transmitted before the downlink signal transmission interval 230 The first subframe of the transmission period may be a reference subframe. For example, if the time interval between the first subframe and the time point 270 at which the base station starts the channel access procedure is n slots or less than the subframe, that is, the UE receives the downlink data channel with respect to the first subframe 240 It may be the case that the base station initiates the channel access procedure before the time that can be reported. In other words, when the base station initiates the channel access procedure 270, or when the base station selects the N value to perform the channel access procedure, or immediately before the downlink data transmitted in the reference subframe 240 When the reception result is not received from the terminal, the base station determines the first subframe of the most recently transmitted downlink signal transmission interval among the reception results for the downlink data channel previously received from the terminals as the reference subframe. can do. And, the base station determines the contention interval size used in the channel access procedure 270 by using the downlink data reception result received from the terminals for downlink data transmitted through the downlink data channel in the reference subframe. I can.

For example, the base station may transmit a downlink signal through a channel access procedure (eg, CW_p=15) set through a channel access priority type 3 (p=3). At this time, the base station, of the downlink signals transmitted through the unlicensed band, the reception result of at least 80% of the reception results of the terminal for downlink data transmitted to the terminal through the downlink data channel in the first subframe as NACK. If it is determined, the contention period may be increased from the initial value (CW_p=15) to the next contention period value (CW_p=31).

If the reception result of 80% or more of the reception result of the terminal is not determined as NACK, the base station may maintain the value of the contention period as the existing value or change to the initial value of the contention period. In this case, the change of the contention period may be applied in common to all types of channel access priority, or may be applied only to the type of channel access priority used in the channel access procedure. At this time, in the reference subframe or the reference slot for determining the contention interval size change, the contention interval size among the reception results for downlink data transmitted or reported by the terminal to the base station for downlink data transmitted through the downlink data channel A method of determining a reception result effective in determining the change, that is, a method of determining the Z value may be as follows.

If the base station transmits one or more codewords or TB to one or more terminals in a reference subframe or reference slot, the base station transmits or reports reception results for the TB received in the reference subframe or reference slot. Among them, the Z value can be determined by the ratio of NACK. For example, when two codewords or two TBs are transmitted to one terminal in a reference subframe or a reference slot, the base station may transmit or receive a downlink data signal reception result for two TBs from the terminal. . If, among the two reception results, the ratio (Z) of NACK is equal to or greater than a threshold value (eg, Z=80%) defined in advance or set between the base station and the terminal, the base station determines the above-described contention interval size. Can be changed or increased.

When the terminal bundles downlink data reception results for one or more subframes (eg, M subframes) including the above-described reference subframe or slot and transmits or reports to the base station, the base station It can be determined that M number of reception results have been transmitted. In addition, the base station may determine the Z value based on the ratio of NACK among the above-described M reception results, and may change, maintain or initialize the contention interval size.

In addition, when the reference subframe is a reception result for the second slot among two slots constituting one subframe, the base station includes the above-described reference subframe (that is, the second slot) and downlink data received in the next subframe. The above-described Z value may be determined based on the ratio of NACK among the reception results transmitted or reported by the terminal to the base station.

In addition, when scheduling information or downlink control information for a downlink data channel transmitted by a base station is transmitted in the same cell or frequency band as a cell or frequency band through which the downlink data channel is transmitted, or downlink data transmitted by the base station When scheduling information or downlink control information for a channel is transmitted through an unlicensed band, but transmitted in a cell different from the cell through which the downlink data channel is transmitted, or at a different frequency, the terminal receives the downlink in the reference subframe or the reference slot When it is determined that the reception result for data has not been transmitted, or when the reception result for downlink data transmitted by the terminal is determined to be DTX, NACK/DTX, or any state, the base station NACKs the reception result of the terminal. It can be determined by determining the above-described Z value.

In addition, when scheduling information or downlink control information for a downlink data channel transmitted by a base station is transmitted through a licensed band, the reception result for downlink data transmitted by the terminal is DTX, or NACK/DTX, or any state When it is determined as, the base station may not include the reception result of the terminal in the reference value Z of the contention period variation. In other words, the base station can ignore the reception result of the terminal and determine the Z value.

In addition, when the base station transmits scheduling information or downlink control information for a downlink data channel through a licensed band, in the downlink data reception result for a reference subframe or a reference slot transmitted or reported by the terminal to the base station, When the base station does not actually transmit downlink data (no transmission), the base station may determine the Z value by ignoring a reception result transmitted or reported by the terminal for downlink data.

In the 5G system, it is necessary to flexibly define and operate the frame structure in consideration of various services and requirements. As an example, it may be considered that each service has a different subcarrier spacing according to requirements. In the current 5G communication system, a method of supporting a plurality of subcarrier spacing can be determined using [Equation 1] as follows.

[Equation 1]

Here, f ₀ represents the basic subcarrier spacing of the system, and m may represent an integer scaling factor.For example, if f ₀ is 15 kHz, a set of subcarrier spacings that a 5G communication system can have ( set) can be composed of 3.75kHz, 7.5kHz, 15kHz, 30kHz, 60kHz, 120kHz, 240kHz, 480kHz, etc. In an embodiment of the present disclosure, a usable subcarrier spacing set (Set) may be different according to a frequency band. For example, 3.75 kHz, 7.5 kHz, 15 kHz, 30 kHz, and 60 kHz may be used in a frequency band of 6 GHz or lower, and 60 kHz, 120 kHz, and 240 kHz may be used in a frequency band of 6 GHz or higher.

The length of the OFDM symbol may vary according to the subcarrier spacing constituting the OFDM symbol. This is because the subcarrier spacing and the length of the OFDM symbol have an inverse relationship with each other as a characteristic of the OFDM symbol. For example, when the subcarrier spacing is doubled, the symbol length is shortened to 1/2, and conversely, when the subcarrier spacing is decreased to 1/2, the symbol length may be doubled.

Next, a resource area through which a data channel is transmitted in a 5G communication system will be described.

3 is a diagram illustrating a resource region through which a data channel is transmitted in an NR or 5G communication system according to an embodiment of the present disclosure.

The UE may monitor or search for the PDCCH 310 in a downlink control channel (hereinafter referred to as PDCCH) region (hereinafter referred to as control resource set (CORESET) to search space (SS)) set through an upper signal from the base station. In this case, the downlink control channel region may be composed of the time domain 314 and the frequency domain 312 information. In addition, the time domain 314 information may be set on a symbol basis, and the frequency domain 312 information may be set on a RB or RB group basis. If the UE detects the PDCCH 310 in the slot i 300, the UE may acquire downlink control information (DCI) transmitted through the detected PDCCH 310. The terminal may obtain scheduling information for a downlink data channel or an uplink data channel through the received downlink control information (DCI). In other words, in the above-described DCI, at least resource region (or PDSCH transmission region) information in which the terminal should receive a downlink data channel (hereinafter referred to as PDSCH) transmitted from the base station, or the terminal allocated from the base station for uplink data channel (PUSCH) transmission At least one of the received resource region information may be included.

An embodiment of a case in which the UE is scheduled to transmit an uplink data channel (PUSCH) is as follows. The terminal receiving the DCI may obtain the slot index or offset information (K) for receiving the PUSCH through the DCI, and determine the PUSCH transmission slot index. Referring to FIG. 3, for example, the UE schedules to transmit a PUSCH in slot i+K 305 through the received offset information (K) based on the slot index i (300) at which the PDCCH 310 is received. It can be judged as received. In this case, the UE may determine a PUSCH start symbol or time in slot i+K 305 or slot i+K based on the received offset information (K) based on the CORESET receiving the PDCCH 310. In addition, the terminal may obtain information on the PUSCH transmission time-frequency resource region 340 in the PUSCH transmission slot 305 through DCI. In this case, the PUSCH transmission frequency resource region information 330 may be group-unit information of PRB to PRB.

Meanwhile, the PUSCH transmission frequency resource domain information 330 is a region included in an initial uplink bandwidth (initial BW, BandWidth) or an initial uplink bandwidth portion (initial BWP, BandWidth Part) determined or set by the terminal through an initial access procedure. Can be If the UE has configured an uplink bandwidth (BW, BandWidth) or an uplink bandwidth part (BWP, BandWidth Part) through a higher signal, the PUSCH transmission frequency resource domain information 330 is the uplink bandwidth set through the higher signal. It may be a region included in (BW, BandWidth) or an uplink bandwidth part (BWP, BandWidth Part).

The PUSCH transmission time resource region information 325 may be symbol or group unit information of a symbol, or information indicating absolute time information. In this case, the PUSCH transmission time resource region information 325 may be expressed as a PUSCH transmission start time or symbol and a length of a PUSCH, or a PUSCH end time or a combination of symbols, and may be included in DCI as one field or value. In this case, the PUSCH transmission time resource region information 325 may be included in the DCI as a field or value representing each of the PUSCH transmission start time or symbol and the length of the PUSCH or the PUSCH end time or symbol. The UE may transmit the PUSCH in the PUSCH transmission resource region 340 determined through DCI.

Hereinafter, a downlink control channel in an NR or 5G communication system will be described in more detail with reference to the drawings.

4 is a diagram illustrating an example of a control region (Control Resource Set, CORESET) in which a downlink control channel is transmitted in an NR or 5G wireless communication system according to an embodiment of the present disclosure. Referring to FIG. 4, two control regions (control region #1 401, control region #2 402) are set within a bandwidth portion 410 of the terminal as a frequency axis and one slot 420 as a time axis.

The control regions 401 and 402 may be set in a specific frequency resource 403 within the entire terminal bandwidth portion 410 on the frequency axis. The time axis may be set to one or more OFDM symbols, and this may be defined as a control region length (Control Resource Set Duration, 404). In FIG. 4, for example, control region #1 401 is set to a control region length of 2 symbols, and control region #2 402 is set to a control region length of 1 symbol.

The control region in 5G may be configured through higher layer signaling (eg, system information, master information block (MIB), radio resource control (RRC) signaling) provided by the base station to the terminal. Setting a control region to a terminal may mean providing information such as a control region identifier, a frequency position of the control region, and a symbol length of the control region. For example, the control area setting may include the following information.

[Table 3]

로 가지는 6 PRB 그룹을 의미하며, 여기서

는 BWP 시작지점을 나타낼 수 있다. 비트맵의 최상위 비트는 첫번째 그룹을 지시하며 오름차순으로 설정될 수 있다.In Table 3 described above, the tci-StatesPDCCH (hereinafter referred to as TCI state) configuration information is one or more SS (Synchronization Signal)/PBCH (Physical) in a relationship between DMRS and QCL (Quasi Co Location) transmitted in the corresponding control region. It may include information of a Broadcast Channel) block index or a Channel State Information Reference Signal (CSI-RS) index. In addition, the frequencyDomainResources setting information may set the frequency resource of the corresponding CORESET as a bitmap. Here, each bit may indicate a group of 6 PRBs that do not overlap. The first group is the first PRB index

Branch with means 6 PRB groups, where

May indicate the BWP starting point. The most significant bit of the bitmap indicates the first group and may be set in ascending order.

5 is a diagram illustrating a structure of a downlink control channel that can be used in an NR or 5G communication system according to an embodiment of the present disclosure. Specifically, FIG. 5 is a diagram illustrating an example of a basic unit of time and frequency resources constituting a downlink control channel that can be used in an NR or 5G communication system. According to FIG. 5, the basic unit of time and frequency resources constituting the control channel may be called REG (Resource Element Group, 503), where REG 503 is 1 OFDM symbol 501 on the time axis and 1 PRB on the frequency axis. (Physical Resource Block, 502), that is, it may be defined as 12 subcarriers. REG 503 may be concatenated to constitute a downlink control channel allocation unit.

As shown in FIG. 5, when a basic unit to which a downlink control channel is allocated in 5G is a control channel element (CCE) 504, one CCE 504 may be composed of a plurality of REGs 503. When the REG 503 shown in FIG. 4 is described as an example, the REG 503 may be composed of 12 REs, and when 1 CCE 504 is composed of 6 REGs 503, 1 CCE 504 ) May consist of 72 REs. When a downlink control region is set, the corresponding region may be composed of a plurality of CCEs 504, and a specific downlink control channel is divided into one or more CCEs 504 according to an aggregation level (AL) within the control region. It can be mapped and transmitted. The CCEs 504 in the control region are classified by numbers, and the numbers may be assigned according to a logical mapping method.

The basic unit of the downlink control channel shown in FIG. 5, that is, the REG 503 may include both REs to which DCI is mapped and a region to which a demodulation reference signal (DMRS) 505, which is a reference signal for decoding them, is mapped. . As illustrated in FIG. 5, three DMRSs 505 may be transmitted in 1 REG 503.

The number of CCEs required to transmit the PDCCH may be 1, 2, 4, 8, or 16 depending on the aggregation level (AL), and the number of different CCEs indicates link adaptation of the downlink control channel. Can be used to implement. For example, when AL=L, one downlink control channel may be transmitted through L CCEs. The UE needs to detect a signal without knowing the information on the downlink control channel, and a search space indicating a set of CCEs may be used to aid in such blind decoding. The search space is a set of downlink control channel candidates (Candidates) consisting of CCEs to which the UE should attempt decoding on a given aggregation level. According to an embodiment of the present disclosure, since there are various aggregation levels that make one bundle of 1, 2, 4, 8, and 16 CCEs, the terminal may have a plurality of search spaces. The search space set may be defined as a set of search spaces at all set aggregation levels.

The search space may be classified into a common search space and a UE-specific search space. A certain group of terminals or all terminals may examine the common search space of the PDCCH in order to receive common control information such as dynamic scheduling or paging message for system information. For example, PDSCH scheduling allocation information for transmission of an SIB including cell operator information, etc. may be received by examining a common search space of the PDCCH. In the case of a common search space, since a certain group of UEs or all UEs must receive the PDCCH, it can be defined as a collection of pre-promised CCEs. The scheduling allocation information for the UE-specific PDSCH or PUSCH may be received by examining the UE-specific search space of the PDCCH. The terminal-specific search space may be terminal-specifically defined based on a function of the identity of the terminal and various system parameters.

In 5G, a parameter for the search space of the PDCCH may be set from the base station to the terminal based on higher layer signaling (eg, SIB, MIB, RRC signaling). For example, the base station has the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the monitoring occasion per symbol in the slot for the search space, the search space type (common search space or terminal-specific search space), and the corresponding The combination of the DCI format and RNTI to be monitored in the search space, and the control region index to monitor the search space can be set to the terminal. For example, the above-described setting information may include the following information.

[Table 4]

According to the configuration information, the base station may set one or a plurality of search space sets to the terminal. For example, the base station may set search space set 1 and search space set 2 to the terminal, and set to monitor DCI format A scrambled with X-RNTI in search space set 1 in a common search space, and search space set 2 DCI format B scrambled with Y-RNTI can be set to be monitored in a UE-specific search space.

According to the above-described setting information, one or a plurality of search space sets may exist in a common search space or a terminal-specific search space. For example, search space set #1 and search space set #2 may be set as a common search space, and search space set #3 and search space set #4 may be set as a terminal-specific search space.

In the common search space, a combination of the following DCI format and RNTI can be monitored.

- DCI format 0_0/1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

- DCI format 2_0 with CRC scrambled by SFI-RNTI

- DCI format 2_1 with CRC scrambled by INT-RNTI

- DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

- DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

In the UE-specific search space, a combination of the following DCI format and RNTI may be monitored.

- DCI format 0_0/1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

- DCI format 1_0/1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

The RNTIs specified above may follow the following definitions and uses.

- C-RNTI (Cell RNTI): For UE-specific PDSCH scheduling

- TC-RNTI (Temporary Cell RNTI): For UE-specific PDSCH scheduling

- CS-RNTI (Configured Scheduling RNTI): For semi-statically configured UE-specific PDSCH scheduling

- RA-RNTI (Random Access RNTI): For PDSCH scheduling in the random access phase

- P-RNTI (Paging RNTI): PDSCH scheduling for paging transmission

- SI-RNTI (System Information RNTI): For PDSCH scheduling in which system information is transmitted

- INT-RNTI (Interruption RNTI): Used to inform whether PDSCH is pucturing

- TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to instruct the power control command for PUSCH

- TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to instruct the power control command for PUCCH

- TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to instruct the power control command for SRS

In 5G, a plurality of search space sets may be set with different parameters (eg, DCI format). Accordingly, the set of search space sets monitored by the terminal may vary at each time point. For example, if search space set #1 is set to X-slot period, search space set #2 is set to Y-slot period, and X and Y are different, the terminal searches search space set #1 in a specific slot. Both space set #2 can be monitored, and one of search space set #1 and search space set #2 can be monitored in a specific slot.

When a plurality of search space sets are set in the terminal, the following conditions may be considered in a method of determining a search space set to be monitored by the terminal.

[Condition 1: Limit the maximum number of PDCCH candidates]

The number of PDCCH candidates that can be monitored per slot may not exceed M ^μ . M ^μ may be defined as the maximum number of PDCCH candidate groups per slot in a cell set to a subcarrier interval of 15·2 ^μ kHz, and may be defined as shown in the following table.

[Table 5]

[Condition 2: Limit the maximum number of CCEs]

The number of CCEs constituting the entire search space per slot may not exceed C ^μ . Here, the entire search space may mean the entire CCE set corresponding to the union region of a plurality of search space sets. C ^μ may be defined as the maximum number of CCEs per slot in a cell set to a subcarrier interval of 15·2 ^μ kHz, and may be defined as shown in the following table.

[Table 6]

For the convenience of description, a situation in which both conditions 1 and 2 are satisfied at a specific point in time is defined as “condition A”. Therefore, not satisfying condition A may mean not satisfying at least one of the above-described conditions 1 and 2.

According to the settings of the search space sets of the base station, there may be a case where the above-described condition A is not satisfied at a specific time point. If the above-described condition A is not satisfied at a specific point in time, the terminal may select and monitor only a part of the set of search spaces set to satisfy condition A at the point in time, and the base station may transmit the PDCCH to the selected search space set. .

The following method can be followed as a method of selecting some of the search spaces from the set of all search spaces.

[Method 1]

When condition A for the PDCCH is not satisfied at a specific time point (or slot), the UE (or base station) selects a search space set in which the search space type is set as a common search space among search space sets existing at the time point. -It is possible to preferentially select a set of search spaces set as a specific search space.

When all search space sets set as common search spaces are selected (that is, if condition A is satisfied even after selecting all search spaces set as common search spaces), the terminal (or base station) is transferred to the terminal-specific search space. You can select the set of search spaces. In this case, when there are a plurality of search space sets set as a terminal-specific search space, a search space set having a low search space set index may have a higher priority. The terminal or the base station may select terminal-specific search space sets within a range in which condition A is satisfied in consideration of priority.

In the case of an NR or 5G communication system, in order to provide various services and support a high data rate, the terminal may transmit an uplink signal without uplink scheduling information. More specifically, When the terminal wants to transmit an uplink signal without uplink scheduling information, information such as resource allocation and MCS for uplink transmission may be configured through RRC signaling or DCI of the PDCCH, and uplink transmission that can be performed is According to the uplink transmission setting reception method, the description may be classified into at least the following types.

-Type 1: Uplink transmission configuration using RRC signaling

-Type 2: Uplink transmission configuration using the uplink data channel of the physical layer

6 is a diagram illustrating an example of transmitting an uplink signal without uplink scheduling information in an unlicensed band according to an embodiment of the present disclosure.

In the unlicensed band, the terminal may perform a channel access procedure to transmit an uplink signal without uplink scheduling information. At this time, when the UE accesses the unlicensed band by performing a channel access procedure for a variable time, the last slot 604 or the last sub in the maximum channel occupancy time 612 through the channel occupancy time sharing indicator of the uplink control information 605 The frame 604 can be scheduled for downlink transmission. In this case, the base station may determine channel access by performing a channel access procedure for a fixed time, and the terminal may determine the last symbol of the slot 608 or subframe 608 for uplink transmission, and the channel access procedure of the base station. It can be set as a gap section to be emptied for.

6, downlink transmission may be limited to the PDCCH 609, the start symbol of the PDCCH 609 is limited to the first symbol of the last slot 604 or the last subframe 604, and two It can have a symbol length within. Meanwhile, since the downlink transmission time resource region information in the 5G communication system can be determined through DCI, the transmission start time or symbol of the PDCCH 610 and the length and end time or symbol of the PDSCH 611 are variously Can be set. Accordingly, when the UE shares the acquired maximum channel occupancy time, it is necessary to indicate time resource region information for downlink reception in the uplink control information 620.

In a 5G communication system, in order to dynamically change a downlink signal transmission and a downlink signal transmission period in a TDD system, each of the OFDM symbols constituting one slot is a downlink symbol or an uplink symbol, or is flexible. Whether it is a symbol may be indicated through a slot format indicator (SFI). Here, the symbol indicated by the flexible symbol is not both a downlink and an uplink symbol, or refers to a symbol that can be changed to a downlink or uplink symbol by UE-specific control information or scheduling information. In this case, the flexible symbol may include a gap guard required in the process of switching from downlink to uplink.

The slot format indicator is simultaneously transmitted to a plurality of terminals through a terminal group (or cell) group common control channel. In other words, the slot format indicator is transmitted through the CRC scrambled PDCCH with an identifier different from the UE unique identifier (C-RNTI) (eg, SFI-RNTI). In this case, the slot format indicator may include information on N slots. The value of N may be an integer or natural value greater than 0, or from among a set of predefined possible values such as 1, 2, 5, 10, 20, etc., the base station can set it to the terminal through a higher signal. In addition, the size of the slot format indicator information may be set by the base station to the terminal through an upper signal. An example of a slot format that can be indicated by the slot format indicator is shown in Table 7 below.

[Table 7] Example of slot format structure information

In [Table 7], D represents downlink, U represents uplink, and X represents a flexible symbol. The number of formats that can be supported in [Table 7] is a total of 256. In the current NR system, the maximum size of the slot format indicator information bit is 128 bits, and the slot format indicator information bit is a value that the base station can set to the terminal through an upper signal (eg, dci - PayloadSize ). The slot format indicator information may include a slot format for a plurality of serving cells, and a slot format for a serving cell may be identified through a servingcell ID. In addition, a slot format combination for one or more slots for each serving cell may be included in the slot format indicator information. For example, when the size of the slot format indicator information bit is 3 bits and the slot format indicator information is composed of a slot format indicator for one serving cell, the 3 bits slot format indicator information is a total of 8 slot format indicators to slots. It may be composed of a format indicator combination (hereinafter, a slot format indicator). The base station may indicate to the terminal one slot format indicator among the eight slot format indicators through the terminal group common control information (group common DCI) (hereinafter, slot format indicator information). In this case, at least one of the eight slot format indicators may be configured as a slot format indicator for a plurality of slots. For example, in the following [Table 8], five pieces of information (slot format combination ID 0, 1, 2, 3, 4) in [Table 7] are slot format indicators for one slot, and the remaining three are four. This is information on the slot format indicator (slot format combination ID 5, 6, 7) for the slot, and is sequentially applied to 4 slots.

[Table 8] This is an example of slot format indicator information.

On the other hand, the terminal is indicated to be flexible with higher signaling (e.g. tdd -UL- DL - ConfigurationCommon or tdd-UL-DL-ConfiguredDedicated ), or higher signaling (e.g. tdd -UL- DL - ConfigurationCommon or tdd -UL - DL - ConfiguredDedicated), if the slot format is, for slot format DCI (for example indicative of a symbol is not set slots, DCI format 2_0) a failure to detect or receive, perform the following operations for the corresponding symbol can do.

-If the terminal receives a DCI indicating PDSCH or CSI-RS reception in a corresponding symbol (e.g., DCI format 1_0, DCI format 1_1, DCI format 0_1), the terminal receives the PDSCH or CSI-RS in the corresponding symbol. Can receive.

-If the terminal receives a DCI indicating transmission of PUSCH, PUCCH, PRACH, and SRS in the corresponding symbol (e.g., DCI format 0_0, DCI format 0_1, DCI format 1_0, DCI format 1_1, DCI format 2_3), The UE may transmit PUSCH, PUCCH, PRACH, and SRS in the corresponding symbol.

-If the UE is configured to receive PDSCH or CSI-RS in the corresponding symbol as higher signaling, the UE does not receive the PDSCH or CSI-RS in the corresponding symbol.

-If the UE receives SRS or PUCCH or PUSCH or PRACH transmission in the corresponding symbol as higher signaling, the transmission start of the corresponding uplink transmission signal is located after the PUSCH preparation time from the last symbol of CORESET for monitoring format DCI. In this case, the UE does not transmit the corresponding uplink signal.

-If the UE receives SRS or PUCCH or PUSCH or PRACH transmission in the corresponding symbol as higher signaling, the transmission start of the corresponding uplink transmission signal is located before the PUSCH preparation time from the last symbol of CORESET for monitoring the slot format DCI If so, the terminal can transmit the corresponding uplink signal.

In a 5G communication system, a base station or a terminal may transmit and receive signals in a broadband unlicensed band, and the broadband unlicensed band may be configured in a subband (eg, 20MHz) unit. The base station and the terminal may perform a channel access procedure in units of subbands to occupy an unlicensed band, and at least one of all subbands or one subband or consecutive subbands in an idle state according to the result of the channel access procedure. It is possible to perform set signal transmission by accessing the unlicensed band in the manner of In this case, the uplink signal may be transmitted as separate transmission data for each idle subband or as one transmission data in a plurality of idle subbands. On the other hand, when the terminal performs a channel access procedure for each subband in a broadband unlicensed band and transmits an uplink signal in an idle subband, the base station cannot know which subband the terminal occupies to perform uplink transmission. . Accordingly, the base station must demodulate the transmitted uplink signal in consideration of possible uplink transmission combinations in the scheduled subband. Accordingly, in order to reduce the signal processing complexity of the base station, the terminal needs to inform the base station of the result of performing a channel access procedure or resource region information used for uplink transmission.

In the present disclosure, in a base station and a terminal configured to receive or transmit a downlink signal or an uplink signal in a broadband unlicensed band, the terminal performs a channel access procedure for uplink transmission to the base station, and the resource region used for uplink transmission. I would like to suggest a way to provide information. More specifically, it is proposed a method and apparatus for a base station to provide resource region information to be used by a terminal as downlink control information, or for a terminal to transmit uplink control information including uplink transmission information.

Hereinafter, the method and apparatus proposed in the embodiments of the present disclosure are limited to each embodiment and are not applied, and the uplink transmission region is set or determined using all or a combination of one or more embodiments proposed in the disclosure. It is possible to utilize in the method and apparatus. In addition, in the embodiment of the present disclosure, a case in which a base station and a terminal set or determine an uplink transmission region in a subband-based broadband unlicensed band will be described as an example, but multi-carrier or carrier aggregation It will also be applicable when configuring an uplink transmission area in a broadband system such as transmission. In addition, it may be applicable to the case of setting the control channel region in a single carrier or single band system in addition to the broadband. In addition, in the embodiment of the present disclosure, the description will be made on the assumption of a base station and a terminal operating in a broadband unlicensed band, but implementation of the present disclosure not only in the unlicensed band, but also in base stations and terminals operating in a licensed band or a shared spectrum. The method and apparatus proposed in the example can be applied. In addition, in the embodiment of the present disclosure, a description will be made on the assumption of scheduling-based broadband uplink transmission, but it may be applied to uplink transmission in which scheduling is not required (configured grant).

[Example 1]

This embodiment proposes a method of configuring uplink signal transmission in a guard band when a terminal transmits uplink in a wideband unlicensed band. More specifically, a method and an apparatus for instructing the use information of the guardband to the base station when the terminal transmits uplink through uplink control information is proposed.

FIG. 7 is a diagram illustrating an example of configuring uplink signal transmission in a guard band when a terminal transmits uplink in a broadband unlicensed band according to an embodiment of the present disclosure. Referring to FIG. 7, the operation of the present embodiment will be described as follows.

Hereinafter, in a base station and a terminal that transmit and receive signals in a broadband unlicensed band, after performing a channel access procedure on a subband basis, a PUSCH transmission is performed by accessing at least one subband in an idle state according to the result of performing the channel access procedure. Assuming a terminal configured to perform, the operation of the terminal will be described.

The terminal may perform the channel access procedure in units of subbands 701, 702, 703, and 704. As a result of performing the channel access procedure, if subband #1 (702) and subband #2 (703) are determined to be idle subbands, the terminal upwards in subband #1 (702) and subband #2 (703). Link signals 706 and 707 may be transmitted. In this case, the uplink signals 706 and 707 may be transmitted as separate transmission data for each idle subband or as one transmission data in a plurality of idle subbands.

On the other hand, in the wideband unlicensed band, since the channel access procedure is performed in units of subbands, each subband has guard bands (708, 709) in which signals are not transmitted at both ends of the subband to protect the channel access procedure of the adjacent subband. Must exist. To this end, the base station may perform uplink scheduling in consideration of the guard bands 708 and 709. As another method, the base station can perform uplink scheduling without considering the guard bands 708 and 709. In this case, the UE may not transmit an uplink signal to the guard bands 708 and 709 during uplink transmission.

However, when the UE intends to perform uplink transmission in consecutive subbands 702 and 703 as a result of performing the channel access procedure, the guard band 709 between consecutive subbands protects the channel access procedure of adjacent subbands. You may not need to. In other words, when contiguous subbands 702 and 703 are occupied, the UE may be able to transmit an uplink signal even in the guard band 709 between contiguous subbands. Hereinafter, a method of setting or determining signal transmission for a guardband between consecutive subbands in a base station is proposed.

<Example 1-1>

Referring to FIG. 8, an operation of setting or determining a signal transmission for a guard band between consecutive subbands in a base station by the terminal will be described as follows.

The UE may transmit an uplink signal including a guardband use indicator in the uplink control information. More specifically, when the terminal wants to transmit uplink signals 806 and 807 in a plurality of consecutive subbands 802 and 803 according to the result of performing the channel access procedure, the guard band 809 located between the consecutive subbands ) Can also transmit an uplink signal. At this time, the terminal transmits the guardband usage indicator to the base station by including the uplink control information, and the base station receiving the guardband usage indicator includes the guardband 809 located between consecutive subbands 802 and 803. Decoding can be performed. A method of configuring a guardband indicator in uplink control information may be as follows.

[Method 1]

The terminal may indicate whether the guardband is used or not through 1-bit signaling. For example, if the guardband usage indicator transmitted by the terminal included in the uplink control information is 1, the base station may decode the uplink signal including the signal transmitted to the guardband. If the guardband usage indicator transmitted by the terminal in the uplink control information is 0, the base station determines that the uplink signal has not been transmitted to the guardband, and can decode the uplink signal excluding the guardband.

[Method 2]

The terminal may indicate whether the guardband is used or not through X-bit signaling. X may be set as the number of subbands set for higher signaling or downlink control information from the base station or the number of subbands scheduled for higher signaling. For example, the UE receives uplink scheduling in four subbands from the base station, and as a result of performing a channel access procedure for each subband, it can perform uplink transmission only in subband #1 (802) and subband #2 (803). have. At this time, when the UE intends to include an uplink signal in the guard band 809 between the consecutive subbands 802 and 803, the guard band is provided with 4-bit bit information (for example, 0110) in the uplink control information. Can indicate whether to use. The base station receiving bit information on whether or not the guard band is used may decode an uplink signal including a signal transmitted to the guard band 809 included between consecutive subbands.

When transmitting uplink control information including a guardband use indicator, the UE may transmit uplink control information in all subbands 802 and 803 to perform uplink transmission, respectively. At this time, each of the uplink control information is at least information on each subband (e.g., separate transmission data for each subband) to transmit uplink or all subbands (e.g., a plurality of idle data) performing uplink transmission. It may include information on one transmission data in the band. According to another embodiment of the present disclosure, when transmitting uplink, the terminal may transmit including uplink control information only in at least one specific subband, and a method of selecting at least one specific subband may be as follows. have.

[Method 3]

According to an embodiment of the present disclosure, after performing a channel access procedure for each subband, the UE determines the lowest (or highest) subband index (or configuration index) among at least one or more idle subbands to perform uplink transmission. Uplink transmission including uplink control information can be performed only in subbands with which they have. According to another embodiment of the present disclosure, the UE may perform uplink transmission including uplink control information only in a subband in which CORESET#0 to SS/PBCH block transmission is configured. According to another embodiment of the present disclosure, the terminal may transmit an uplink signal including uplink control information in a subband indicated by a base station through an upper signal or a control channel. In addition, the UE may determine a subband to be transmitted including uplink control information by using one or more combinations of the above-described methods. In this case, when the base station succeeds in decoding uplink control information in one specific subband, the base station may not perform uplink control information decoding on another subband.

[Method 4]

According to an embodiment of the present disclosure, after performing a channel access procedure for each subband, the UE may configure a specific subband to transmit uplink control information according to a specific rule among at least one or more idle subbands intended to perform uplink transmission. . For example, the terminal may determine a specific subband using at least a combination of a terminal number (UE ID), an RNTI value, a CRC, and the number of idle subbands (K). For example, the UE may transmit an uplink signal including uplink control information in the subband of the index determined by mod(UE IDxRNTI, K).

The above-described guardband use indicator may be used as information for instructing (or determining) to the base station a result of performing a channel access procedure for each subband obtained by the terminal as well as whether the guardband is used.

<Example 1-2>

According to an embodiment of the present disclosure, the terminal may determine the use of the guardband when transmitting an uplink signal by receiving a guardband use indicator from the base station or using scheduling information received from the base station. More specifically, when transmitting the downlink control information to the terminal, the base station may transmit, including the guardband use indicator. In this case, the guardband use indicator may be included in downlink control information through the aforementioned bit signaling. According to another embodiment of the present disclosure, the UE includes at least a channel occupancy time (or frequency) among scheduling information received from a base station, a method for performing a channel access procedure (for example, Type 3), a start symbol position of uplink transmission, or The use of the guardband can be determined using the downlink channel sharing indicator. For example, when the time point at which the uplink scheduling is received from the base station is within the channel occupancy time (or frequency) of the base station, when an instruction to share a channel occupied by the base station is received, the terminal configures an uplink signal without performing a channel access procedure from the base station. When received (e.g., Type3 channel access procedure), or when the uplink transmission start time is included in a gap period (e.g., 16us) that does not require performing a channel access procedure, the terminal is in a continuous subband scheduled by the base station. It can be determined that uplink transmission can be performed in the guardband.

[Example 2]

In this embodiment, a method and apparatus for performing a channel access procedure for each subband in a broadband unlicensed band and transmitting a result of performing the channel access procedure for each subband to a base station are proposed.

9 is a diagram illustrating an example in which a terminal performs a channel access procedure in units of subbands and transmits a result of performing the channel access procedure for each subband to a base station in a broadband unlicensed band according to an embodiment of the present disclosure. Referring to FIG. 9, the operation of the present embodiment will be described as follows.

According to an embodiment of the present disclosure, the terminal may perform a channel access procedure for each subband in a broadband unlicensed band, and may inform the base station of the result of performing the channel access procedure. More specifically, the terminal may inform the base station by including information on a subband that is determined to be an idle band and transmits an uplink signal in uplink control information through bit signaling.

For example, as a result of performing the channel access procedure, the UE determines that subband #1 (902) and subband #2 (903) are idle bands, and uplink transmission is performed in subbands (902, 903) determined as idle bands. Can be done. In this case, the terminal may include bit signaling (eg 0110) in the uplink control information and transmit it to the base station. In this case, the uplink control information may be transmitted after at least one slot or after a predetermined time from the slot 905 performing the first uplink transmission.

As another example, the terminal may transmit the first uplink transmission including the uplink control information 908 through puncturing or rate matching in the slot 905 performing the first uplink transmission. have. Here, puncturing or rate matching may be determined in consideration of at least a payload size or processing time of uplink control information. For example, if the payload size is less than [X] bits or the processing time (or symbol) for generating an uplink signal after rate matching is less than [Y], the UE includes uplink control information in the uplink signal. Can perform puncturing.

The channel access procedure result instructed by the terminal to the base station as described above may be used as information for determining (or indicating) the use of a guard band between the base station or consecutive subbands of the terminal.

[Example 3]

In this embodiment, when a terminal performs a channel access procedure for each subband for uplink transmission in a broadband unlicensed band, and wants to transmit an uplink signal according to the result of performing the channel access procedure, the location of the uplink control information is set ( Or we propose a method and apparatus to judge).

<Example 3-1>

Referring to FIG. 9, the operation of the terminal according to the present embodiment may be described as follows.

When the UE intends to transmit an uplink signal without including the above-described guardband use indicator in the uplink signal or without including the uplink signal in the guardband, the uplink control information 911 and 912 is not included in the guardband. May not. For example, when the UE wants to transmit an uplink signal in the contiguous subbands 902 and 903 as a result of performing the channel access procedure, the UE can also transmit the uplink signal in the guardband 910 located between the contiguous subbands 902 and 903. Can transmit signals. In this case, the UE may not locate the uplink control information 911 and 912 indicating whether the guard band is used or not in the guard band 910.

<Example 3-2>

The terminal may transmit the result of performing the above-described channel access procedure of the terminal to the base station as separate uplink control information. In this case, the UE may transmit uplink control information including uplink control information in the first uplink signal transmission through puncturing or rate matching in the slot performing the first uplink transmission. The location of the uplink control information in the slot in which the first uplink transmission is performed may be determined in the following manner.

[Method 1]

Referring to FIG. 10, the operation of the terminal according to the present embodiment may be described as follows.

According to an embodiment of the present disclosure, when a plurality of DMRS transmissions are configured within one slot when transmitting an uplink signal, the UE transmits uplink control information 1013 to the first symbol capable of transmitting an uplink signal after the last DMRS 1004. Including, it is possible to transmit an uplink signal. In this case, the uplink control information may be mapped from the lowest (or highest) resource element, and may be mapped at a predetermined interval according to the number of mapped bits.

In addition, the UE may transmit an uplink signal including uplink control information 1023 from a first symbol or a first resource element in which uplink data transmission starts after the first DMRS.

[Method 2]

According to an embodiment of the present disclosure, the base station may indicate to the terminal a resource region in which separate uplink control information is to be transmitted, using higher level signaling or downlink control information. For example, if the base station instructs the terminal to transmit uplink control channel information to symbol #9, the terminal may map the uplink control channel information from the lowest (or higher) resource element of symbol #9.

[Method 3]

According to an embodiment of the present disclosure, the UE may transmit a mapping location of separate uplink control information by setting a time or frequency domain location to existing uplink control information. The base station may first decode the existing uplink control information and then acquire a mapping position of the separate uplink control information to perform decoding of the separate uplink control information.

[Method 4]

The operation of the terminal according to the present embodiment will be described with reference to FIG. 10 as follows.

According to an embodiment of the present disclosure, the terminal may puncture the channel access procedure result information 1033 in the region 1032 in which the existing uplink control information is located. In this case, the terminal may determine the puncturing performance according to the priority of information included in the existing uplink control information. For example, the UE may transmit a result of performing a channel access procedure by performing puncture on a resource element having channel information or HARQ feedback information.

[Example 4]

In this embodiment, when the terminal performs the channel access procedure for each subband in the broadband unlicensed band and transmits the result of the channel access procedure performed by the terminal to the base station, the location of the uplink control information included when the terminal transmits an uplink signal is determined. A method and apparatus for changing (or adjusting) is proposed.

More specifically, the terminal may perform a channel access procedure for each third band and inform the base station of the result of performing the channel access procedure in the above-described manner. Thereafter, the terminal may change (or adjust) the mapping position of the uplink control information transmitted together when transmitting the uplink signal from at least one slot or after a predetermined time from the slot in which the result of performing the channel access procedure is transmitted. Hereinafter, a specific method for the UE to change (or adjust) the location of uplink control information is proposed.

<Example 4-1>

11 is a diagram illustrating an example in which a terminal changes (or adjusts) a location of uplink control information according to an embodiment of the present disclosure. Referring to FIG. 11, the operation of the terminal according to the present embodiment may be described as follows.

According to an embodiment of the present disclosure, the terminal may transmit a guardband usage indicator to the base station, or transmit a result of performing a channel access procedure of the terminal instructing transmission of uplink signals in consecutive subbands to the base station. At this time, the UE also includes uplink control information in the guard band 1120 between consecutive subbands from the slot 1103 in which the uplink signal including the uplink control information is transmitted, at least after the next slot 1104 or after a predetermined time. It can be transmitted including (1106). In this case, the terminal may determine the number of bits of the uplink control information in consideration of the guard band 1120. In addition, a slot or a predetermined time to which the changed mapping position of the uplink control information is applied may be received from the base station as higher level signaling or downlink control information.

<Example 4-2>

Referring to FIG. 11, the operation of the terminal according to the present embodiment may be described as follows.

According to an embodiment of the present disclosure, the UE may transmit uplink control information 1107, 1108 in a plurality of subbands before transmitting the result of performing the channel access procedure for each subband or the guardband use indicator to the base station. . At this time, each of the uplink control information includes information on at least each subband (eg, different transmission data for each subband) or all subbands for transmitting the uplink (eg, one transmission in a plurality of subbands). Data).

Meanwhile, the terminal may transmit a guardband use indicator to the base station, or transmit a result of performing a channel access procedure of the terminal, which means transmission of uplink signals in consecutive subbands, to the base station. At this time, the terminal transmits the uplink control information 1107, 1108 including information capable of indicating (or determining) the result of the channel access procedure of the terminal to the base station, from the slot 1113 in which the corresponding uplink control information is transmitted. After the next slot 1114 or after a predetermined time, the uplink control information 1109 may be included and transmitted only in at least one specific subband. A method of selecting at least one specific subband may be as follows.

[Method 1]

According to an embodiment of the present disclosure, after performing a channel access procedure for each subband, the UE determines the lowest (or highest) subband index (or configuration index) among at least one or more idle subbands to perform uplink transmission. Only the subband having the uplink control information can be included and transmitted. According to another embodiment of the present disclosure, the UE may perform uplink transmission by including uplink control information only in a subband in which CORESET#0 to SS/PBCH block transmission is configured. According to another embodiment of the present disclosure, the terminal may transmit an uplink signal by including uplink control information in a subband indicated by a base station through an upper signal or a control channel.

In addition, the terminal may determine a subband to include uplink control information even by using one or more combinations of the above-described methods. In this case, when the base station succeeds in decoding uplink control information in one specific subband, the base station may not perform uplink control information decoding on another subband.

[Method 2]

According to an embodiment of the present disclosure, after performing a channel access procedure for each subband, the UE may configure a specific subband to transmit uplink control information according to a specific rule among at least one or more idle subbands intended to perform uplink transmission. . For example, the terminal may determine a specific subband using at least a combination of a terminal number (UE ID), an RNTI value, a CRC, and the number of idle subbands (K). For example, the terminal may transmit an uplink signal including uplink control information in the subband of the index determined by mod(UE IDxRNTI, K).

In the above-described embodiments of the present disclosure, uplink signal transmission has been described as an example, but the method and apparatus proposed in the embodiment of the present disclosure are not limited to uplink signal transmission and may be applied to downlink signal transmission. will be. For example, when a base station performs a channel access procedure for transmitting a downlink signal and transmits a downlink signal using a continuous subband as a result of channel access disconnection, the base station indicates whether a guardband is used in the downlink control signal. Including a downlink signal can be transmitted.

12 is a flowchart illustrating an operation of a base station according to an embodiment of the present disclosure.

In step 1200, the base station may transmit a configuration for transmission/reception of PDCCH, PDSCH, PUCCH, and PUSCH to the terminal through higher level signaling. For example, the base station may transmit a PDCCH resource region for receiving downlink or uplink scheduling information, a CORESET setting, a search space setting, and the like to the terminal through higher signaling. In addition, the base station may transmit a configuration regarding PDSCH/PUSCH transmission/reception to the terminal through higher signaling, including information on a PDCCH reception slot, a PDSCH reception slot, or offset information between PUSCH transmission slots, information on the number of repeated transmissions of PDSCH or PUSCH, and the like.

In step 1210, the base station may additionally transmit configuration information related to grant-free, such as grant-free transmission period and offset information, to the terminal. In this case, it may be possible to transmit the grant-free-related configuration information transmitted to the terminal in step 1210 in step 1200.

If uplink scheduling is performed to the terminal within the channel occupancy interval acquired by the base station in step 1220, the base station may set the transmission gap interval related information to the terminal to the terminal in step 1230. For example, the base station transmits a channel occupancy time (or frequency), a method of performing a channel access procedure (for example, Type 3), a start symbol position of uplink transmission, or a downlink channel sharing indicator to the terminal for uplink transmission. Can be set.

When the transmission gap interval set by the base station to the terminal in step 1240 satisfies a specific value or condition (for example, 16us or less), the base station transmits the uplink signal when the guard band between consecutive subbands is transmitted in the uplink of the terminal. It can be determined that it was used for.

When the base station receives the guardband usage indicator or the channel access procedure result from the terminal in step 1270, the base station may determine that the guardband between consecutive subbands is used for uplink transmission, and the mapping position of the uplink control information Can be judged (or changed).

13 is a flowchart illustrating an operation of a terminal according to an embodiment of the present disclosure.

In step 1100, the UE receives the configuration for transmission and reception of PDCCH, PDSCH, PUCCH, and PUSCH from the base station through an upper signal, and may configure the transmission and reception of PDCCH, PDSCH, PUCCH, and PUSCH according to the received configuration information. For example, the UE may receive a PDCCH resource region for receiving downlink or uplink scheduling information from a base station, a CORESET setting, a search space setting, and the like, through an upper signal.

In step 1310, the UE may additionally receive configuration information related to grant-free, such as grant-free transmission period and offset information. In this case, the grant-free related configuration information in step 1310 may be included in the higher signal configuration information transmitted in step 1300.

If the terminal receives uplink scheduling within the channel occupied interval acquired by the base station in step 1330, the terminal may receive information about the transmission gap interval from the base station in step 1330. For example, the terminal may receive information such as a channel occupancy time (or frequency), a method of performing a channel access procedure (for example, Type 3), a start symbol position of uplink transmission, a downlink channel sharing indicator, etc. from the base station. .

If the transmission gap interval set by the base station to the terminal in step 1340 satisfies a specific value or condition (for example, 16us or less), the terminal transmits an uplink signal using a guard band between consecutive subbands during uplink transmission. Can be transmitted.

In step 1370, when the terminal transmits the guardband usage indicator or the channel access procedure result to the base station, the terminal can transmit an uplink signal using a guardband between consecutive subbands, and the position at which uplink control information is transmitted Can be changed (or adjusted).

[Example 5]

In the present embodiment, in the base station and the terminal configured to receive or transmit a downlink signal or an uplink signal in an unlicensed band, when the terminal does not receive the DCI indicating the slot format, the downlink signal reception or the uplink signal transmission is performed. I would like to suggest a way to do it.

More specifically, if the base station operating in the unlicensed band determines that the channel is occupied as a result of the channel access procedure, downlink transmission may not be performed. For example, the base station may not be able to transmit the DCI indicating the slot format to the terminal. A terminal that is not instructed to the slot format may not be able to perform uplink transmission or downlink reception set as the above-described higher signal, and performance degradation may occur accordingly. In the following, a method and apparatus for a UE to transmit an uplink signal or receive a downlink signal are proposed.

Referring to FIG. 14, the operation of the terminal according to the present embodiment may be described as follows. The terminal may receive a DCI indicating a slot format (eg, DCI format 2_0) in a time/frequency domain configured as higher signaling or may perform monitoring on a DCI indicating a slot format.

At this time, if the terminal misses the DCI indicating the slot format, or if the base station fails to transmit the DCI indicating the slot format due to a channel access failure, the terminal receives (or decodes) the DCI 1400 indicating the slot format. ) May not be possible. At this time, the terminal does not transmit an uplink signal set as an upper signal or a downlink signal set as an upper signal for a predetermined time (1401) from the last symbol of the time domain set to monitor or receive the DCI indicating the slot format. Link signals may not be received. Here, the predetermined time 1401 may include at least a Xiang Hing link (or PUSCH) preparation time (or processing time) or a downlink (or PDSCH) preparation time (or processing time) or a timing advance time.

In addition, the uplink signal set as the higher signal may include at least uplink transmission that does not require scheduling (Configured grant PUSCH) or periodic/aperiodic/semi-static SRS transmission or PUCCH (or scheduling request) or PRACH transmission. In addition, the downlink signal set as the higher signal may include at least downlink transmission or CSI-RS that does not require scheduling. On the other hand, from a predetermined time 1401 to a specific time 1403, for example, until the start symbol of the time domain in which the DCI 1402 indicating the next slot format is monitored or received An uplink signal set as a signal can be transmitted. In this case, the terminal may not receive a downlink signal set as an upper signal.

In order to perform the above-described operation according to the present embodiment, the base station may configure the terminal to perform the above-described operation through separate higher-level signaling or may instruct the terminal to perform the above-described operation through L1 signaling.

15 is a block diagram illustrating an internal structure of a base station according to an embodiment of the present disclosure. As illustrated in FIG. 15, the base station of the present disclosure may include a processor 1510, a transceiver 1520, and a memory 1530. However, the components of the base station are not limited to the above-described example. For example, the terminal may include more or fewer components than the above-described components. In addition, the processor 1510, the transceiver 1520, and the memory 1530 may be implemented in the form of a single chip. According to the communication method of the base station described above, the transceiver 1520 and the processor 1510 It can work.

The transceiving unit 1520 may transmit and receive signals with a terminal. Here, the signal may include control information and data. To this end, the transceiving unit 1520 may include an RF transmitter that up-converts and amplifies a frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts a frequency. However, this is only an embodiment of the transmission/reception unit 1520, and components of the transmission/reception unit 1520 are not limited to the RF transmitter and the RF receiver.

Also, the transceiver 1520 may receive a signal through a wireless channel and output it to the processor 1510, and transmit a signal output from the processor 1510 through a wireless channel.

The processor 1510 may control a series of processes so that the base station can operate according to the above-described embodiment of the present disclosure. According to an embodiment of the present disclosure, the processor 1510 may perform a channel access procedure for an unlicensed band. For example, the processor 1510 receives signals transmitted in the unlicensed band through the transceiver 1520, and defines the strength of the received signal in advance, or the value of a function taking bandwidth as a factor, and a determined threshold. Compared with the value, it is possible to determine whether the unlicensed band is idle. In addition, the processor 1510 may change or reset the uplink signal reception method according to the uplink control information transmitted by the terminal.

The memory 1530 may store programs and data required for operation of the base station. Also, the memory 1530 may store control information or data included in a signal acquired from the base station. The memory 1530 may include a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a memory formed of a combination of storage media. Also, the memory 1530 may be formed of a plurality of memories.

16 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present disclosure. As shown in FIG. 16, the terminal of the present disclosure may include a processor 1610, a transceiver 1620, and a memory 1630. However, the components of the terminal are not limited to the above-described example. For example, the terminal may include more or fewer components than the above-described components. In addition, the processor 1610, the transceiver 1620, and the memory 1630 may be implemented in the form of a single chip.

The transceiver 1620 may transmit and receive signals to and from the base station. The above-described signal may include control information and data. To this end, the transceiver 1620 may include an RF transmitter that up-converts and amplifies a frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts a frequency. In addition, the transmission/reception unit 1620 may receive a signal through a wireless channel, output it to the processor 1610, and transmit a signal output from the processor 1610 through a wireless channel.

The processor 1610 may control a series of processes so that the terminal can operate according to the above-described embodiment of the present disclosure. For example, the processor 1610 may receive a data signal including a control signal from through the transceiver 1620 and determine a reception result of the data signal. Thereafter, when it is necessary to transmit the first signal reception result to the base station including data reception at the above-described timing, the processor 1610 transmits the above-described first signal reception result to the base station through the transceiver 1620 at the determined timing. You can do it. For another example, the processor 1610 may generate information for the base station to determine an uplink reception and reception method as uplink control information. In this case, the control information may be changed according to a result of performing a channel access procedure and a method of generating an uplink signal.

Meanwhile, the embodiments of the present disclosure disclosed in the present specification and drawings are merely provided with specific examples to easily describe the technical content of the present disclosure and to aid understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, that other modified examples based on the technical idea of the present disclosure may be implemented is obvious to those of ordinary skill in the technical field to which the present disclosure belongs. In addition, each of the above-described embodiments may be combined and operated as necessary. For example, some of the methods proposed in the present disclosure may be combined with each other to operate a base station and a terminal. In addition, the above-described embodiments were presented based on 5G and NR systems, but other systems such as LTE, LTE-A, LTE-A-Pro system, and V2X may also have other modifications based on the technical idea of the above-described embodiments. will be.

Claims (1)

In a method for a terminal to set up an uplink data channel in an unlicensed band in a wireless communication system,
Receiving information on data channel setting from a base station;
Setting an uplink data channel region based on the data channel configuration information; And
And transmitting data including uplink control information configuration to the base station through the configured uplink data channel region.

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