Method and device for data transmission and reception in wireless communication system

Abstract

The present disclosure relates to a communication technology for combining IoT technology with a 5G communication system to support a higher data transmission rate than a 4G system, and a system thereof. The present disclosure can be applied to smart services based on 5G communication technology and IoT-related technologies (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, security and safety-related services, etc.).

Description

Technical Field

[0001] The present disclosure relates to a communication system and more particularly to a method and apparatus for scheduling and transmitting / receiving data according to the amount of data that a terminal can process or according to a data rate. Background Art

[0002] In order to meet the increased demand for wireless data traffic since the deployment of the fourth generation (4G) communication system, efforts have been made to develop an improved fifth generation (5G) or pre-5G communication system. Therefore, the 5G or pre-5G communication system is also called "beyond 4G network" or "post-long term evolution (LTE) system". The 5G communication system is considered to be implemented in a higher frequency (mmWave) band, such as the 60GHz band, in order to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming, massive antenna technology are discussed in the 5G communication system. In addition, in the 5G communication system, the development of system network improvements is being carried out based on advanced small cells, cloud radio access networks (RANs), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multi-point (CoMP), receiving-end interference cancellation, etc. In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coded modulation (ACM), as well as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have also been developed.

[0003] The Internet is a human-centered connected network in which humans generate and consume information, and is now developing into the Internet of Things (IoT), where distributed entities (e.g., things) exchange and process information without human intervention. The Internet of Everything (IoE) has emerged, which is a combination of IoT technology and big data processing technology through connection with cloud servers. Since technical elements such as "sensing technology", "wired / wireless communication and network architecture", "service interface technology" and "security technology" are required for the realization of IoT, sensor networks, machine-to-machine (M2M) communication, machine-type communication (MTC), etc. have been studied recently. This IoT environment can provide intelligent Internet technology services that create new value for human life by collecting and analyzing data generated by connected things. IoT can be applied to various fields including smart homes, smart buildings, smart cities, smart vehicles or connected vehicles, smart grids, health care, smart instruments and advanced medical services through the integration and combination between existing information technology (IT) and various industrial applications.

[0004] In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine type communications (MTC), and machine-to-machine (M2M) communications can be implemented through beamforming, MIMO, and array antennas. The application of cloud radio access networks (RAN) as the above-mentioned big data processing technology can also be seen as an example of the integration of 5G technology and IoT technology.

[0005] As the above-mentioned wireless communication systems advance, various services can be provided, and accordingly, there is a need for a solution to smoothly provide these services.

[0006] The above information is provided as background information only to assist in understanding the present disclosure. No determination has been made, and no assertion has been made, as to whether any of the above content may be applicable as prior art to the present disclosure. Summary of the invention

[0007] Technical issues

[0008] In a wireless communication system, especially in an NR system, the data rate that a terminal can support can be predetermined between the base station and the terminal. This can be calculated using the maximum frequency band, maximum modulation order, maximum number of layers, etc. supported by the terminal. However, the base station cannot schedule the amount of data corresponding to the instantaneous data rate higher than the calculated data rate for the terminal. In addition, the scheduling operation of the base station and the data transmission / reception operation of the terminal may vary due to different calculation methods of the instantaneous data rate.

[0009] The NR system can provide not only data communication between the base station and the terminal, but also data communication between terminals. In the case of data communication between terminals, it is necessary to determine the data rate that the terminal can support. It is also necessary to define the operation of the terminal after determining the data rate and scheduling information.

[0010] Technical Solution

[0011] Aspects of the present disclosure are to at least solve the above problems and / or disadvantages and to provide at least the advantages described below. Therefore, one aspect of the present disclosure is to provide an apparatus and method for scheduling and sending / receiving data according to the amount of data that a terminal can process or according to a data rate.

[0012] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments.

[0013] According to one aspect of the present disclosure, there is provided a method performed by a terminal in a communication system, the method comprising: identifying a counterpart of the communication of the terminal as another terminal; obtaining at least one parameter for identifying a data rate of the communication; and identifying the data rate based on the at least one parameter and the following formula:

[0014]

[0015] According to another aspect of the present disclosure, a terminal in a communication system is provided. The terminal includes a transceiver and a controller coupled to the transceiver. The controller is configured to: identify a counterpart of the terminal's communication as another terminal; obtain at least one parameter for identifying a data rate of the communication; and identify the data rate based on the at least one parameter and the following formula:

[0016]

[0017] Beneficial Effects

[0018] According to the present disclosure, a terminal and a base station can determine a maximum data rate during communication between a terminal and another terminal or between a terminal and a base station, and a device performing scheduling can effectively send / receive data by scheduling data so as not to exceed the maximum data rate supported by the corresponding terminal.

[0019] Other aspects, advantages and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0021] Figure 1 The basic structure of the time-frequency domain according to an embodiment of the present disclosure is shown, where the time-frequency domain is a radio resource domain in which data or a control channel is transmitted in a downlink or uplink in an NR system;

[0022] Figure 2 An aspect of an embodiment according to the present disclosure is shown, in which multiple data for services eMBB, URLLC and mMTC considered in a 5G or NR system are allocated in frequency time resources, Figure 3 An aspect of an embodiment according to the present disclosure is shown, wherein multiple data for services eMBB, URLLC and mMTC considered in a 5G or NR system are allocated in frequency time resources;

[0023] Figure 4A process of dividing a transport block into a plurality of code blocks and adding CRC thereto according to an embodiment of the present disclosure is shown;

[0024] Figure 5 A method of using and sending an outer code according to an embodiment of the present disclosure is shown;

[0025] Fig. 6A is a block diagram showing a structure of a communication system that does not use an outer code according to an embodiment of the present disclosure;

[0026] Figure 6B is a block diagram showing a structure of a communication system using an outer code according to an embodiment of the present disclosure;

[0027] Figure 7 A method of generating one or more parity check code blocks by applying a second channel code or an outer code to a plurality of code blocks obtained by dividing a transport block according to an embodiment of the present disclosure is shown;

[0028] Fig. 8A An example of multicast transmission in a wireless communication system according to an embodiment of the present disclosure is shown;

[0029] Figure 8B An example of hybrid automatic repeat request (HARQ) feedback transmission according to multicast in a wireless communication system according to an embodiment of the present disclosure is shown;

[0030] Fig. 9 An example of unicast transmission in a wireless communication system according to an embodiment of the present disclosure is shown;

[0031] Fig. 10A An example of performing side link data transmission according to scheduling of a base station in a wireless communication system according to an embodiment of the present disclosure is shown;

[0032] Fig. 10B An example of sidelink data transmission without scheduling of a base station in a wireless communication system according to an embodiment of the present disclosure is shown;

[0033] Fig.11A An example of a channel structure of a time slot for side link communication in a wireless communication system according to an embodiment of the present disclosure is shown;

[0034] Fig. 11B is a flowchart showing a method for determining whether a terminal performs PDSCH decoding, PUSCH transmission, and PSSCH reception according to an embodiment of the present disclosure;

[0035] Fig.12 is an example showing that side link symbols or channels are mapped to time slots and used according to an embodiment of the present disclosure;

[0036] Fig.13 An example of determining a time slot including a specific time in a carrier configured by high-layer signaling in a terminal according to an embodiment of the present disclosure is shown;

[0037] Fig.14 Terminal operations for downlink reception or sidelink transmission / reception according to an embodiment of the present disclosure are shown;

[0038] Fig.15 is another diagram illustrating terminal operations for downlink reception or sidelink transmission / reception according to an embodiment of the present disclosure;

[0039] Fig.16 is another diagram illustrating terminal operations for downlink reception or sidelink transmission / reception according to an embodiment of the present disclosure;

[0040] Fig.17 is another diagram illustrating terminal operation for downlink reception or PSSCH transmission and reception according to an embodiment of the present disclosure;

[0041] Fig.18 is another diagram illustrating terminal operation for downlink reception or PSSCH transmission and reception according to an embodiment of the present disclosure;

[0042] Fig.19 is another diagram illustrating the operation of a base station according to an embodiment of the present disclosure;

[0043] Fig. 20A is another diagram illustrating the operation of a base station according to an embodiment of the present disclosure;

[0044] Fig. 20B An embodiment of a base station determining scheduling resources of a terminal according to an embodiment of the present disclosure is shown;

[0045] Fig.21 The operation of the terminal executing the embodiment of the present disclosure is shown;

[0046] Fig. 22 is a block diagram of a terminal according to an embodiment of the present disclosure; and

[0047] Fig.23 is a block diagram of a base station according to an embodiment of the present disclosure.

[0048] The same reference numbers are used throughout the drawings to denote the same elements. DETAILED DESCRIPTION

[0049] The following description with reference to the accompanying drawings is intended to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in understanding, but these details should be considered as merely exemplary. Therefore, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and structures may be omitted for clarity and conciseness.

[0050] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable people to clearly and consistently understand the present disclosure. Therefore, it should be clear to those skilled in the art that the following description of various embodiments of the present disclosure is only for illustration purposes and is not intended to limit the disclosure defined by the attached claims and their equivalents.

[0051] It should be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0052] New Radio Access Technology (NR) is a new 5G communication that aims to enable various services to be freely multiplexed in time and frequency resources. Therefore, in the NR system, waveforms, digital and / or reference signals can be dynamically or freely allocated according to the needs of the corresponding services. In order to provide the best service to the terminal in wireless communication, it is necessary to perform data transmission optimization based on the measurement of channel quality and interference. Therefore, it is crucial to accurately measure the channel state. In the 4G communication system, the channel and interference characteristics do not change greatly depending on the frequency resource. However, unlike the 4G communication system, in the case of 5G channels, the channel and interference characteristics will change greatly depending on the service. Therefore, subset support in the frequency resource group (FRG) dimension may be required to measure the channel and interference characteristics of each frequency resource separately. At the same time, the service types supported in the NR system can be divided into enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable and low latency communication (URLLC). eMBB can be a service for high-speed transmission of large-capacity data. mMTC can be a service for minimizing the power consumption of the terminal and the access of multiple terminals. URLLC can be a service for high reliability and low latency. Depending on the type of service applied to the terminal, different requirements may apply.

[0053] As the next generation communication system is studied, various methods of scheduling communication with terminals are currently being discussed. Therefore, considering the characteristics of the next generation communication system, an efficient scheduling and data transmission / reception scheme is desired.

[0054] As described above, a variety of services can be provided to users in a communication system. In order to provide a variety of services to users, a method and apparatus for providing respective services within the same time interval is desired.

[0055] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0056] When describing the embodiments of the present disclosure, descriptions related to technical contents that are well known in the art and not directly related to the present disclosure will be omitted. Such unnecessary descriptions are omitted to prevent the main idea of ​​the present disclosure from being obscured and to convey the main idea more clearly.

[0057] For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted or schematically illustrated. In addition, the size of each element does not fully reflect the actual size. In the accompanying drawings, the same or corresponding elements are provided with the same reference numerals.

[0058] By referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the methods for achieving them will be apparent. However, the content of the present disclosure is not limited to the embodiments described below, but can be implemented in various forms. The following embodiments are provided only to fully disclose the present disclosure and inform those skilled in the art of the scope of the present disclosure, and the present disclosure is only defined by the scope of the attached claims. Throughout the specification, the same or similar reference numerals represent the same or similar elements.

[0059] Here, it is understood that each block in the flowchart illustration, as well as the combination of blocks in the flowchart illustration, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device will produce means for implementing the specified functions in the flowchart blocks. These computer program instructions can also be stored in a computer-usable or computer-readable memory, which can direct the computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-usable or computer-readable memory produce an article of manufacture including an instruction device that implements the specified functions in the flowchart blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing device to cause a series of operations to be performed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide operations to implement the specified functions in the flowchart blocks.

[0060] In addition, each block of the flow chart illustration may represent a module, segment or part of a code, including one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative embodiments, the functions indicated in the blocks may not appear in order. For example, two blocks that are displayed in succession may actually be performed substantially simultaneously, or these blocks may sometimes be performed in reverse order, depending on the functions involved.

[0061] As used herein, "unit" refers to a software element or a hardware element, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), which performs a predetermined function. However, "unit" does not always have a meaning limited to software or hardware. The "unit" can be constructed to be stored in an addressable storage medium or to execute one or more processors. Therefore, "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, programs, subroutines, fragments of program code, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and parameters. The elements and functions provided by the "unit" can be combined into a smaller number of elements or "units" or divided into a larger number of elements or "units". In addition, these elements and "units" may be implemented to copy one or more CPUs in a device or a secure multimedia card. In addition, the "unit" in the present embodiment may include one or more processors.

[0062] Wireless communication systems have evolved into broadband wireless communication systems that provide high-speed and high-quality packet data services, moving away from the early stage of providing only voice services, such as the communication standards of High Speed ​​Packet Access (HSPA), Long Term Evolution (LTE or Evolved Universal Terrestrial Radio Access (E-UTRA)) and LTE-Advanced (LTE-A) of 3GPP, High Speed ​​Packet Data (HRPD) and Ultra Mobile Broadband (UMB) of 3GPP2, 80.16e of IEEE, etc. In addition, in the fifth generation wireless communication system, the communication standard of 5G or New Radio (NR) has been formulated.

[0063] The NR system is a representative example of a broadband wireless communication system, which adopts an orthogonal frequency division multiplexing (OFDM) scheme in the downlink (DL) and uplink. More specifically, the downlink adopts a cyclic prefix OFDM (CP-OFDM) scheme; the uplink adopts two schemes, including the CP-OFDM scheme and the discrete Fourier transform spread OFDM (DFT-S-OFDM) scheme. The uplink refers to the radio link through which the terminal (user equipment (UE)) or mobile station (MS) sends data or control signals to the base station (BS or gNode B). The downlink refers to the radio link through which the base station sends data or control signals to the terminal. In the multiple access scheme described above, the time-frequency resources on which the data or control information to be transmitted to each user are generally allocated and managed to meet orthogonality, that is, they do not overlap with each other, so that the data or control information of each user can be distinguished.

[0064] The NR system uses a hybrid automatic repeat request (HARQ) scheme, and if the decoding fails during initial transmission, the corresponding data is resent at the physical layer. In the HARQ scheme, if the receiver fails to accurately decode the data, the receiver sends information notifying the decoding failure (negative acknowledgment (NACK)) to the transmitter to allow the transmitter to resend the corresponding data in the physical layer. The receiver combines the data resent by the transmitter with the data that failed to be decoded before to improve data reception performance. In addition, if the receiver accurately decodes the data, the receiver sends information notifying the decoding success (acknowledgment (ACK)) to the transmitter to allow the transmitter to send new data.

[0065] Figure 1 The basic structure of the time-frequency domain according to an embodiment of the present disclosure is shown, where the time-frequency domain is a radio resource domain in which data or a control channel is transmitted in a downlink or uplink in a NR system.

[0066] Reference Figure 1 , the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The smallest transmission unit in the time domain is the OFDM symbol, N symbOFDM symbols 102 are grouped together to configure a time slot 106. The length of a subframe is defined as 1.0 milliseconds, and a radio frame 114 is defined as 10 milliseconds. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission band consists of a total of or The number of subcarriers 104 is configured.

[0067] In the time-frequency domain, the basic resource unit is a resource element (RE) 112, which is represented by an OFDM symbol index and a subcarrier index. A resource block (RB) 108 (or a physical resource block (PRB)) is represented by N in the time domain. symb consecutive OFDM symbols 102 and N in the frequency domain RB Thus, one RB 108 is defined by N consecutive subcarriers 110. symb ×N RB Generally speaking, the minimum data transmission unit is one RB. symb =14, N RB =12, Proportional to the bandwidth of the system transmission band. In addition, the data rate can be increased in proportion to the number of RBs scheduled for the terminal.

[0068] In the NR system, if it is an FDD system in which the downlink and uplink operate at different frequencies, the downlink transmission bandwidth and the uplink transmission bandwidth may be different from each other. The channel bandwidth represents the RF bandwidth corresponding to the system transmission bandwidth. Table 1 shows the correspondence between the system transmission bandwidth and the channel bandwidth defined in the fourth generation wireless communication system (LTE system) before the NR system. For example, in an LTE system with a channel bandwidth of 10MHz, the transmission bandwidth may include 50 RBs.

[0069] [Table 1]

[0070]

[0071] The NR system can operate at a wider channel bandwidth than the channel bandwidth of LTE proposed in Table 1.

[0072] The bandwidth of the NR system can be configured as shown in Table 2 and Table 3. Table 2 describes the bandwidth configuration of frequency range 1 (FR1), and Table 3 describes the bandwidth configuration of frequency range 2 (FR2).

[0073] [Table 2]

[0074]

[0075]

[0076] [Table 3]

[0077]

[0078] In the NR system, the frequency range can be divided and defined as FR1 and FR2. For example, FR1 means 450MHz to 7125MHz, and FR2 means 24250Mhz to 52600MHz.

[0079] In the above content, the ranges of FR1 and FR2 can be changed and applied differently. For example, the frequency range of FR1 can be changed from 450 MHz to 7125 MHz and applied.

[0080] In the NR system, scheduling information for downlink data or uplink data can be sent from the base station to the terminal through downlink control information (DCI). DCI is defined according to various formats, and DCI can indicate whether it is scheduling information for uplink data (UL grant) or scheduling information for downlink data (DL grant) according to each format, whether it is a compact DCI with a small amount of control information, whether spatial multiplexing using multiple antennas is applied, or whether DCI for power control is applied. For example, DCI format 1-1 is scheduling control information (DL grant) for downlink data, which may include at least one of the following control information.

[0081] -Carrier indicator: Indicates the carrier frequency on which the transmission is made.

[0082] -DCI format indicator: The DCI format indicator indicates whether the corresponding DCI is for downlink or uplink.

[0083] - Bandwidth Part (BWP) indicator: Indicates the BWP for transmission.

[0084] - Frequency domain resource allocation: represents RBs in the frequency domain, which are allocated for data transmission. Resources are determined based on the system bandwidth and resource allocation scheme.

[0085] -Time domain resource allocation: represents the time slot and the OFDM symbol of the time slot, in which the data-related channel will be transmitted.

[0086] - VRB-PRB mapping: represents a mapping scheme by which a virtual RB (VRB) index is mapped to a physical RB (PRB) index.

[0087] - Modulation and Coding Scheme (MCS): indicates the coding rate and modulation scheme used for data transmission. That is, MCS can indicate a coding rate value, which can indicate a transport block size (TBS) and channel coding information, as well as information related to QPSK, 16QAM, 64QAM, and 256QAM.

[0088] -Code Block Group (CBG) transmission information: indicates information about the CBG being sent when retransmission in CBG units is configured.

[0089] -HARQ process number: indicates the HARQ process number.

[0090] - New data indicator: indicates whether the HARQ transmission is an initial transmission or a retransmission.

[0091] - Redundancy version: indicates the redundancy version of HARQ.

[0092] - Transmit Power Control (TPC) Command of Physical Uplink Control Channel (PUCCH): indicates the TPC command of PUCCH which is an uplink control channel.

[0093] In the case of PUSCH transmission, time domain resource allocation may be performed based on information about the time slot in which the PUSCH is transmitted, the starting symbol position S in the corresponding time slot, and the number of symbols L to which the PUSCH is mapped. In the above, S may be the relative position from the start of the time slot, L may be the number of consecutive symbols, and S and L may be determined based on a start and length indication value (SLIV) defined as follows.

[0094]

[0095] Generally speaking, in the NR system, the terminal can receive a configuration table through RRC configuration, in which the SLIV value, the PDSCH or PUSCH mapping type, and information about the time slot in which the PDSCH or PUSCH is transmitted (for example, in the form of a table) are included in one row. Thereafter, for the time domain resource allocation of the DCI, the base station can send the SLIV value, the PDSCH or PUSCH mapping type, and information about the time slot in which the PDSCH or PUSCH is transmitted to the terminal by indicating the indicator value in the table configured as above.

[0096] In the NR system, the PUSCH mapping type is defined by type A and type B. In PUSCH mapping type A, the first symbol in the DMRS symbol is located at the second or third OFDM symbol in the slot. In PUSCH mapping type B, the first symbol in the DMRS symbol is located at the first OFDM symbol in the time domain resources allocated for PUSCH transmission.

[0097] In the NR system, the PDSCH mapping type is defined by type A and type B, and the first symbol in the DMRS symbol can be located in the first symbol of the PDSCH.

[0098] Table 4 and Table 5 respectively show the combinations of S and L, which are supported for each type of PDSCH and PUSCH.

[0099] [Table 4]

[0100]

[0101] [Table 5]

[0102]

[0103] The DCI may undergo channel coding and modulation processes and may then be transmitted through a physical downlink control channel (PDCCH) (or “control information”, hereinafter used interchangeably) which is a downlink physical control channel.

[0104] Generally speaking, DCI is scrambled with a specific radio network temporary identifier (RNTI) (or terminal identifier), scrambled independently for each terminal, a cyclic redundancy flag (CRC) is added to it, and channel coding is performed, and each independent PDCCH is configured and sent accordingly. PDCCH is mapped and sent in the control resource set (CORESET) configured for the terminal.

[0105] Downlink data can be transmitted through a physical downlink shared channel (PDSCH), which is a physical channel for downlink data transmission. The PDSCH can be transmitted after the control channel transmission interval, and in the frequency domain, scheduling information (e.g., a specific mapping position and modulation scheme) can be determined based on the DCI transmitted through the PDCCH.

[0106] Through the MCS included in the control information in the DCI, the base station can inform the terminal of the modulation scheme 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 can be configured by 5 bits or more or less. Before applying error correction channel coding to the data, the TBS corresponds to the size of the data (transport block, TB) that the base station expects to send.

[0107] In the present disclosure, a transport block (TB) may include a medium access control (MAC) header, a MAC control element (CE), one or more MAC service data units (SDUs), and padding bits. According to another embodiment, a TB may represent a data unit from a MAC layer to a physical layer, or a MAC protocol data unit (MAC PDU).

[0108] The modulation schemes supported by the NR system are quadrature phase shift keying (QPSK), 16-quadrature amplitude modulation (16QAM), 64QAM, and 256QAM. The modulation order (Q m) correspond to 2, 4, 6 and 8 respectively. That is, 2 bits per symbol in the case of QPSK modulation, 4 bits per symbol in the case of 16QAM modulation, 6 bits per symbol in the case of 64QAM modulation, and 8 bits per symbol in the case of 256QAM modulation can be transmitted.

[0109] Figure 2 An aspect of an embodiment according to the present disclosure is shown, in which multiple data for services eMBB, URLLC and mMTC considered in a 5G or NR system are allocated in frequency time resources, and Figure 3 An aspect of an embodiment according to the present disclosure is shown, in which multiple data for services eMBB, URLLC and mMTC considered in a 5G or NR system are allocated in frequency time resources.

[0110] Reference Figure 2 and Figure 3 , a scheme can be proposed in which frequency and time resources are allocated for performing information transmission in each system.

[0111] first, Figure 2 An aspect is shown in which multiple data of eMBB, URLLC, and mMTC are allocated to the frequency bandwidth 200 of the entire system. In the process of allocating and transmitting eMBB data 201 and mMTC data 209 in a specific frequency bandwidth, if URLLC data 203, 205, and 207 appear and therefore need to be transmitted, the base station or the terminal can transmit the URLLC data 203, 205, and 207 without clearing or transmitting the portion in which the eMBB data 201 and the mMTC data 209 have been allocated. Since URLLC needs to reduce the delay time in the service, the URLLC data 203, 205, and 207 can be allocated to a portion of the resources allocated with the eMBB data 201, so that they can be transmitted. Of course, in the case where the URLLC data 203, 205, and 207 are additionally allocated and transmitted in the resources allocated to the eMBB data 201, the eMBB data may not be transmitted in the overlapping frequency-time resources, and thus the transmission performance of the eMBB data may be reduced. That is, in the above situation, eMBB data transmission failure due to URLLC allocation may occur.

[0112] exist Figure 3 In the embodiment, the entire system frequency bandwidth 300 can be divided into sub-bands 302, 304 and 306 and used to send services and data therein. Information associated with the sub-band configuration can be predetermined, and the information can be sent by the base station to the terminal through high-layer signaling. Alternatively, the information associated with the sub-band can be arbitrarily divided by the base station or network node and provide services to the terminal without sending separate sub-band configuration information. Figure 3 Sub-band 302 is shown for transmitting eMBB data 308 , sub-band 304 is shown for transmitting URLLC data 310 , 312 , and 314 , and sub-band 306 is shown for transmitting mMTC data 316 .

[0113] Throughout the embodiments, the length of the transmission time interval (TTI) for URLLC transmission may be shorter than the length of the TTI for sending eMBB data or mMTC data. In addition, the response to information related to URLLC may be faster than the information transmission of eMBB or mMTC, so that information can be sent or received with low latency. The structures of the physical layer channels used to send three services or data may be different from each other. For example, at least one of the length of the transmission time interval (TTI), the allocation unit of frequency resources, the structure of the control channel, and the data mapping method may be different.

[0114] In the above embodiment, three types of services and three types of data are assumed and described. Alternatively, there may be more types of services and corresponding data, and the details of the present disclosure may be applied thereto.

[0115] In order to explain the method and apparatus proposed in this embodiment, the terms "physical channel" and "signal" related to the NR system may be used. However, the details of the present disclosure may be applicable to wireless communication systems other than the NR system.

[0116] Figure 4 A process of dividing a transport block into a plurality of code blocks and adding CRC thereto according to an embodiment of the present disclosure is shown.

[0117] Reference Figure 4 , CRC 403 can be added to the last part or the first part of a transport block (TB) 401 to be sent in the uplink or downlink. CRC 403 can have 16 bits, 24 bits or a pre-fixed number of bits, or a variable number of bits according to channel conditions, and can be used to determine whether channel coding is successful. TB 401 and the block to which CRC 403 is added can be divided into a plurality of code blocks (CB) 407, 409, 411 and 413 (denoted by reference numeral 405). The divided code blocks 407, 409, 411 and 413 can have a predetermined maximum size, in which case the size of the last code block 413 can be smaller than the sizes of the other code blocks 407, 409 and 411. However, this is just an example, and according to another example, by inserting zero, a random value or 1 into the last code block 413, the length of the last code block 413 can be adjusted to be the same as the length of the other code blocks 407, 409 and 411.

[0118] CRC 417, 419, 421, and 423 may be added to the divided code blocks (indicated by reference numeral 415), respectively. CRC may include 16 bits, 24 bits, or a pre-fixed number of bits, and may be used to determine whether channel coding is successful.

[0119] TB 401 and the cycle generator polynomial can be used to generate CRC 403. The cycle generator polynomial can be defined in various ways. For example, if it is assumed that the cycle generator polynomial gCRC24A(D)=[D24+D23+D18+D17+D14+D11+D10+D7+D6+D5+D4+D3+D+1] is a 24-bit CRC, and L=24, for TB data a 0 , a 1 , a 2 , a 3 , ..., a A-1 , CRC p 0 , p 1 , p 2 , p 3 , ..., p L-1 It can be determined that 0 D A+23 +a 1 D A+22 +…+a A-1 D 24 +p 0 D 23 +p 1 D 22 +…+p 22 D 1 +p 23 To p 0 , p 1 , p 2 , p 3 , ..., p L-1 A value whose remainder becomes zero after division by gCRC24A(D). In the above example, it is assumed that the CRC length "L" is 24, but the CRC length "L" may be determined to have different lengths, for example, 12, 16, 24, 32, 40, 48, 64, etc.

[0120] Through this process, CRC 403 is added to TB 401, wherein the TB to which CRC is added can be divided into N CBs 407, 409, 411, and 413. CRC 417, 419, 421, and 423 can be added to each of the divided CBs 407, 409, 411, and 413 (denoted by reference numeral 415). The length of CRC 417, 419, 421, and 423 added to CBs 407, 409, 411, and 413 can be different from the length of CRC 403 added to TB 401, or different cyclic generator polynomials can be used. However, CRC 403 added to TB 401 and CRC 417, 419, 421, and 423 added to code blocks 407, 409, 411, and 413 can be omitted, depending on the type of channel code to be applied to the code block. For example, if an LDPC code other than a turbo code is applied to a code block, the CRCs 417, 419, 421, and 423 to be inserted for each code block may be omitted.

[0121] However, even if LDPC is applied, CRC 417, 419, 421, and 423 may be added to the code block as is. In addition, even if polar code is adopted, CRC may be added or omitted.

[0122] As above Figure 4 As described above, the maximum length of one code block is determined according to a channel coding type applied to a TB to be transmitted, and the TB and a CRC added to the TB are divided into a plurality of code blocks according to the maximum length of the code block.

[0123] In a conventional LTE system, the CRC of the CB is added to the divided CB, and the data bits and the CRC of the CB are encoded using channel coding to determine the coded bits, and the number of bits for predetermined rate matching for each coded bit can be determined.

[0124] Figure 5 A method of transmitting using an outer code according to an embodiment is shown. Fig. 6A is a block diagram showing a communication system structure that does not use an outer code according to an embodiment, Figure 6B is a block diagram showing a structure of a communication system using an outer code according to an embodiment.

[0125] Reference Figure 5 , Fig. 6A and Figure 6B , a method of sending a signal using an outer code can be described.

[0126] exist Figure 5In the embodiment, a transmission block is divided into a plurality of code blocks, and the bits or symbols 504 at the same position in each code block are encoded using the second channel code to generate parity check bits or symbols 506 (indicated by reference numeral 502). Thereafter, CRC may be added to each code block and the parity check code block generated by the second channel code encoding, respectively (indicated by reference numerals 508 and 510).

[0127] Whether to add CRC can be determined according to the type of channel code. For example, if a turbo code is used as the first channel code, CRC 508 and 510 are added. Thereafter, each code block and parity check code block can be encoded by the first channel code. In the present disclosure, convolutional code, LDPC code, Turbo code, polar coordinate code, etc. can be used as the first channel code. However, this is only an example, and various channel codes as the first channel code can be applied to the present disclosure. In the present disclosure, as the second channel code, for example, Reed-Solomon code, BCH code, Raptor code, parity check bit generation code, etc. can be used. However, this is only an example, and various channel codes can be applied to the present disclosure as the second channel code.

[0128] Reference Fig. 6A With reference numeral 600 in the figure, if outer code is not used, first channel coding encoder 601 and first channel coding decoder 605 are used in transceiver respectively, and second channel coding encoder and second channel coding decoder may not be used. Even if outer code is not used, the configuration mode of first channel coding encoder 601 and first channel coding decoder 605 may be the same as the situation of using outer code to be described later.

[0129] Reference Figure 6B Referring to the reference numeral 650 in FIG. 1 , if an outer code is used, the data to be transmitted may pass through the second channel code encoder 609. The bits or symbols passed through the second channel code encoder 609 may pass through the first channel code encoder 611. If the channel coding symbol passes through the channel 613 and is received by the receiver, the receiver may sequentially operate the first channel code decoder 615 and the second channel code decoder 617 based on the received signal. The first channel code decoder 615 and the second channel code decoder 617 may respectively perform operations corresponding to the first channel code encoder 611 and the second channel code encoder 609.

[0130] Figure 7 A method of generating one or more parity check code blocks by applying a second channel code or an outer code to a plurality of code blocks obtained by dividing one transport block according to an embodiment of the present disclosure is shown.

[0131] As above Figure 4As described above, a transport block can be divided into one or more code blocks. Here, if only one code block is generated according to the size of the transport block, CRC may not be added to the corresponding code block. If the outer code is applied to the code block to be sent, parity check code blocks 740 and 742 (represented by reference numeral 724) may be generated. If the outer code is used, parity check code blocks 740 and 742 may be located after the last code block (represented by reference numeral 724). After the outer code, CRC 726, 728, 730, 732, 734 and 736 (represented by reference numeral 738) may be added. Thereafter, each code block and parity check code block may be encoded with a channel code together with CRC.

[0132] The size of TB (i.e., TBS) in the NR system can be calculated by the following operation.

[0133] Operation 1: N′ RE , that is, calculate the number of REs allocated to PDSCH mapping in one PRB of the allocated resources.

[0134] Here N RE' Can be Calculate. Here It is 12. It can represent the number of OFDM symbols allocated to PDSCH. It is the number of REs occupied by DMRS of the same CDM group in one PRB. is the number of REs occupied by overhead in a PRB, which is configured through high-level signaling and can be configured to be one of 0, 6, 12, and 18. Afterwards, N can be calculated RE , that is, the total number of REs allocated to PDSCH. RE is through min(156, N RE ′)·n PRB Calculated, N PRB Indicates the number of PRBs allocated to the terminal.

[0135] Operation 2: Number of temporary information bits N info Through N RE *R*Q m *v calculation. Here, R is the coding rate, Q m is the modulation order. Information about this value can be transmitted using a predefined table in the MCS bit field and control information. In addition, v is the number of layers allocated. info When ≤3824, TBS can be calculated by the following operation 3. Otherwise, TBS can be calculated by operation 4.

[0136] Operation 3: You can use the formula and Calculate N′ info TBS can be determined as a value that is closest to or greater than N' in Table 6 below info N′ info .

[0137] [Table 6]

[0138] index TBS index TBS index TBS index TBS 1 24 31 336 61 1288 91 3624 2 32 32 352 62 1320 92 3752 3 40 33 368 63 1352 93 3824 4 48 34 384 64 1416 5 56 35 408 65 1480 6 64 36 432 66 1544 7 72 37 456 67 1608 8 80 38 480 68 1672 9 88 39 504 69 1736 10 96 40 528 70 1800 11 104 41 552 71 1864 12 112 42 576 72 1928 13 120 43 608 73 2024 14 128 44 640 74 2088 15 136 45 672 75 2152 16 144 46 704 76 2216 17 152 47 736 77 2280 18 160 48 768 78 2408 19 168 49 808 79 2472 20 176 50 848 80 2536 21 184 51 888 81 2600 22 192 52 928 82 2664 23 208 53 984 83 2728 24 224 54 1032 84 2792 25 240 55 1064 85 2856 26 256 56 1128 86 2976 27 272 57 1160 87 3104 28 288 58 1192 88 3240 29 304 59 1224 89 3368 30 320 60 1256 90 3496

[0139] Operation 4: You can use the formula and Calculate N′ info TBS can be obtained by N′ info The value of and the following [Pseudo Code 1] determine TBS.

[0140] [Start pseudo code 1]

[0141] IfR≤1 / 4

[0142]

[0143] eles

[0144] If N′ info >8424

[0145] where

[0146] else

[0147]

[0148] End if

[0149] End if

[0150] [End pseudo code 1]

[0151] In the NR system, if a CB is input into the LDPC encoder, parity bits may be added to the CB, and the CB to which the parity bits are added may be output. The number of parity bits may differ according to the LDPC base graph. The method of transmitting all parity bits generated by LDPC encoding for a specific input may be referred to as full buffer rate matching (FBRM), while the method of limiting the number of parity bits that can be transmitted may be referred to as limited buffer rate matching (LBRM).

[0152] If resources are allocated for data transmission, the output of the LDPC encoder is completed using a circular buffer. The bits in the buffer are retransmitted the same number of times as the number of allocated resources. The length of the circular buffer can be called N. cbIf the number of parity bits generated by LDPC coding is N, then N cb is equal to N in the FRRM method. In the LBRM method, N cb represents min(N, N ref ), N ref Depend on Given, R LBRM can be determined as 2 / 3. In the above method for obtaining TBS, TBS LBRM Indicates the maximum number of layers supported by the terminal in the corresponding cell. Further, in order to obtain TBS LBRM If the maximum modulation order is not configured for the corresponding terminal, it is assumed that TBS LBRM For 64QAM, the coding rate is assumed to be 948 / 1024, that is, the maximum bit rate N RE , assuming N RE =156·n PRB , n PRB It can be assumed that n PRB，LBRM , where n PRB，LBRM It can be given as shown in Table 7 below.

[0153] [Table 7]

[0154] Maximum number of PRBs in all configured DL BWP and UL BWP of the carrier <![CDATA[n PRB，LBRM ]]> Less than 33 32 33 to 66 66 67 to 107 107 108 to 135 135 136 to 162 162 163 to 217 217 Greater than 217 273

[0155] The maximum data rate supported by the terminal in the NR system can be determined by the following formula 1.

[0156] [Formula 1]

[0157]

[0158] In Formula 1, J may represent the number of carriers constrained by carrier aggregation, R max =948 / 1024 Indicates the maximum number of layers, It can represent the maximum modulation order, f (j) can represent the scaling factor, and μ can represent the subcarrier spacing. The terminal can (j) Reported as a value of 1, 0.8, 0.75, and 0.4, μ may be given as shown in Table 8 below.

[0159] [Table 8]

[0160] μ <![CDATA[Δf=2 μ ·15[kHz]]]> Cyclic prefix 0 15 normal 1 30 normal 2 60 Normal, Extended 3 120 normal 4 240 normal

[0161] also is the average OFDM symbol length, can be calculated as and is is the maximum number of RBs in BW(j). (j)is the cost value, in OH (j) In the downlink of FR1 (frequency band equal to or less than 6 GHz), it can be given as 0.14, in its uplink, it can be given as 0.18, in the downlink of FR2 (frequency band higher than 6 GHz), it can be given as 0.08, in its uplink, it can be given as 0.10. Through formula 1, in a cell with a frequency bandwidth of 100 MHz and a subcarrier spacing of 30 kHz, the maximum data rate of the downlink can be calculated by the following Table 9.

[0162] [Table 9]

[0163]

[0164] On the other hand, the actual data rate that can be measured by the terminal in actual data transmission can be a value obtained by dividing the amount of data by the data transmission time. This value can be obtained by dividing the TBS by the TTI length in 1TB transmission or by dividing the sum of TBS by the TTI length in 2TB transmission. For example, as shown in Table 6, in a cell with a 100MHz frequency bandwidth and a 30kHz subcarrier spacing, the maximum actual data rate of the downlink can be determined according to the number of allocated PDSCH symbols as shown in Table 10 below.

[0165] [Table 10]

[0166]

[0167] The maximum data rate supported by the terminal can be determined by Table 9, and the actual data rate according to the allocated TBS can be determined by Table 10. At this time, the actual data rate may be greater than the maximum data rate, which depends on the scheduling information.

[0168] In a wireless communication system, especially an NR system, the data rate that a terminal can support can be agreed upon between a base station and a terminal. The data rate can be calculated using the maximum frequency band, maximum modulation order, and maximum number of layers supported by the terminal. However, the calculated data rate may be different from the value calculated based on the transport block size (TBS) used for actual data transmission and the TTI length of the transport block (TB).

[0169] Therefore, there may be a situation where the TBS allocated to the terminal is greater than the value corresponding to the data rate supported by the terminal itself. It may be necessary to minimize the occurrence of this situation and define the operation of the terminal in the above situation. The following embodiments provide a method and apparatus for solving the situation where the maximum data rate that the terminal can support and the actual data rate according to the schedule do not match. In the above content, the maximum data rate can be a value determined based on the capability or terminal capability, and the actual data rate can be a value determined based on the scheduling information when performing data transmission.

[0170] In the embodiments described below, the base station is the subject that performs resource allocation to the terminal, and can be a base station that supports both V2X communication and general cellular communication, or a base station that only supports V2X communication. That is, the base station can represent a new generation node B (gNB), an evolved node B (eNB), or a road station unit (RSU), a base station (BS), a radio access unit, a base station controller, or a fixed station. The terminal can be one of the following: a vehicle supporting vehicle-to-vehicle communication (V2V), a vehicle supporting vehicle-to-pedestrian communication (V2P), a pedestrian's mobile phone (e.g., a smartphone), a vehicle supporting vehicle-to-network communication (V2N), or a vehicle supporting vehicle-to-infrastructure communication (V2I), an RSU equipped with a terminal function, an RSU equipped with a base station function, or an RSU equipped with partial base station functions and partial terminal functions, as well as a general UE and a mobile station.

[0171] In the present disclosure, the terms "physical channel" and "signal" may be used interchangeably with data or control signals. For example, PDSCH is a physical channel through which data is transmitted, but in the present disclosure, PDSCH may be referred to as data. In addition, for example, PSSCH is a physical channel through which data is transmitted, but in the present disclosure, PSSCH may be referred to as data.

[0172] Hereinafter, in the present disclosure, high-layer signaling is a signal transmission method in which a base station sends a signal to a terminal by using a downlink data channel of a physical layer, or a terminal sends a signal to a base station by using an uplink data channel of a physical layer, and may be referred to as RRC signaling or a MAC control element (CE).

[0173] In this disclosure, peak data rate, maximum data rate, highest data rate, etc. may be used interchangeably.

[0174] In a V2X environment, data may be sent from one terminal to multiple terminals, or data may be sent from one terminal to one terminal. Alternatively, data may be sent from a base station to multiple terminals. However, the present disclosure is not limited thereto and may be applicable to various situations.

[0175] In order to send or receive by a terminal through a side link (SL) (SL refers to the radio path of a signal sent by a terminal to at least one other terminal), the terminal operates based on a previously defined, configured, or pre-configured resource pool between terminals. A resource pool can be a set of frequency domain and time domain resources that can be used to send or receive a side link signal. That is, in order to send or receive a side link signal, the sending or receiving of the side link signal needs to be performed in a predetermined frequency time resource, which is defined as a resource pool. The resource pool can be defined for sending and receiving, and can be generally defined and used for sending and receiving. In addition, the terminal can receive the configuration of one or more resource pools, and can perform a side link signal send / receive operation.

[0176] Configuration information related to the resource pool used for side link transmission and reception and other configuration information for the side link can be pre-installed when the terminal is produced, can be configured by the current base station, can be pre-configured by another base station or another network unit before accessing the current base station, can be a fixed value, can be provided from the network, or can be built by the terminal itself.

[0177] The sidelink control channel may be referred to as a physical side downlink control channel (PSCCH), and the sidelink shared channel or data channel may be referred to as a physical sidelink shared channel (PSSCH). In addition, a broadcast channel broadcasted together with a synchronization signal may be referred to as a physical sidelink broadcast channel (PSBCH), and a channel used for feedback transmission may be referred to as a physical sidelink feedback channel (PSFCH). However, PSCCH or PSSCH may be used for feedback transmission. Depending on the communication system, the above channels may be referred to as LTE-PSCCH, LTE-PSSCH, NR-PSCCH, NR-PSSCH, etc. In the present disclosure, a sidelink may represent a link between terminals, and a Uu link may represent a link between a base station and a terminal.

[0178] The information transmitted through the side link may include side link control information (SCI), side link feedback control information (SFCI), side link channel state information (SCSI), and a side link shared channel (SL-SCH) as a transmission channel.

[0179] The information and transport channels described above may be mapped to physical channels as shown in Tables 11 and 12 below.

[0180] [Table 11]

[0181] TrCH (Transport Channel) Physical Channel SL-SCH PSSCH

[0182] [Table 12]

[0183] Control Information Physical Channel SCI PSCCH SFCI PSFCH SCSI PSSCH

[0184] Alternatively, if SCSI is transmitted via PSFCH, the transmission channel-physical channel mapping shown in Tables 13 and 14 may be applied.

[0185] [Table 13]

[0186] TrCH (Transport Channel) Physical Channel SL-SCH PSSCH

[0187] [Table 14]

[0188] Control Information Physical Channel SCI PSCCH SFCI PSFCH SCSI PSFCH

[0189] Alternatively, when SCSI is sent to a higher layer and sent using, for example, MAC CE, SCSI can be sent through PSSCH because higher layer signaling corresponds to SL-SCH. Below, the transmission channel-physical channel mapping shown in Tables 15 and 16 can be applied here.

[0190] [Table 15]

[0191] TrCH (Transport Channel) Physical Channel SL-SCH PSSCH

[0192] [Table 16]

[0193] Control Information Physical Channel SCI PSCCH SFCI PSFCH

[0194] Fig. 8A An example of multicast transmission in a wireless communication system according to an embodiment of the present disclosure is shown.

[0195] Reference Fig. 8A , terminal 820 sends common data to multiple terminals 821a, 821b, 821c and 821d, that is, sends data in a multicast manner. Terminal 820 and terminals 821a, 821b, 821c and 821d can be mobile devices, such as cars. For multicast, at least one of separate control information (such as SCI), physical control channel (such as PSCCH) and data can be sent.

[0196] Figure 8B An example of HARQ feedback transmission according to multicast in a wireless communication system according to an embodiment of the present disclosure is shown.

[0197] Reference Figure 8B The terminals 821a, 821b, 821c and 821d that have received the common data through multicast send information indicating the success or failure of data reception to the terminal 820 that has sent the data. The information indicating the success or failure of data reception may include HARQ-ACK feedback. Fig. 8A and Figure 8B However, according to another embodiment, as shown in FIG. Fig. 8A and Figure 8BThe data transmission and feedback operations shown in can be applied to unicast transmission.

[0198] Fig. 9 An example of unicast transmission in a wireless communication system according to an embodiment of the present disclosure is shown.

[0199] Reference Fig. 9 , the first terminal 920a sends data to the second terminal 920b. As another example, the direction of data transmission may be opposite (i.e., data may be sent from the second terminal 920b to the first terminal 920a). Terminals 920c and 920d other than the first terminal 920a and the second terminal 920b may not receive data sent or received through the unicast scheme between the first terminal 920a and the second terminal 920b. Data transmission or reception through unicast communication between the first terminal 920a and the second terminal 920b may be performed by mapping in the committed resources between the first terminal 920a and the second terminal 920b, may be performed by a process of scrambling using the value committed therebetween, or may be performed using a pre-configured value. Alternatively, control information related to data through unicast communication between the first terminal 920a and the second terminal 920b may be mapped in a committed manner. Alternatively, data transmission or reception through unicast communication between the first terminal 920a and the second terminal 920b may include an operation of mutually identifying a unique ID. The terminal may be a mobile terminal, such as a vehicle. For unicast communication, at least one of separate control information, a physical control channel, and data may be transmitted.

[0200] Fig. 10A An example of scheduled sidelink data transmission of a base station in a wireless communication system according to an embodiment of the present disclosure is shown.

[0201] Fig. 10A The "Mode 1" method is shown, which is a method in which a terminal that has received scheduling information from a base station transmits side link data. In the present disclosure, the method for performing side link communication based on scheduling information is referred to as "Mode 1", but it may be called differently. Fig. 10A , a terminal 1020a (hereinafter referred to as a "transmitting terminal") that wants to perform transmission through a side link receives scheduling information for side link communication from a base station 1010. After receiving the scheduling information, the transmitting terminal 1020a transmits side link data to another terminal 1020b (hereinafter referred to as a "receiving terminal") based on the scheduling information. The scheduling information for side link communication received from the base station is included in the DCI, and the DCI may include at least one of the items shown in Table 17 below.

[0202] [Table 17]

[0203]

[0204] Scheduling can be performed for a one-time sidelink transmission or for periodic transmissions, semi-persistent scheduling (SPS), or a grant of a transmission configuration. The scheduling method can be distinguished by an indicator included in the DCI, RNTI scrambling added to the CRC in the DCI, or an ID value. The DCI for sidelink transmissions can also include padding bits (e.g., 0 bits) to make the size of the DCI the same as the size of another DCI format, such as a DCI for downlink scheduling or uplink scheduling.

[0205] The transmitting terminal 1020a receives the DCI for sidelink scheduling from the base station 1010, sends a PSCCH including sidelink scheduling information to the receiving terminal 1020b, and then sends a PSSCH of data corresponding to the PSCCH. SCI is the sidelink scheduling information sent by the terminal through the PSCCH, and may include at least one of the items shown in Table 18 below.

[0206] [Table 18]

[0207]

[0208]

[0209] The control information including at least one of the items shown in Table 18 may be included in a single SCI or two SCIs to be transmitted to the receiving terminal. The transmission method performed in a divided manner through two SCIs may be called a two-stage SCI method.

[0210] Fig. 10B An example of sidelink data transmission without scheduling by a base station in a wireless communication system according to an embodiment of the present disclosure is shown.

[0211] Reference Fig. 10B , which shows an example of a "Mode 2" method, which is a method in which a terminal sends side link data without receiving scheduling information from a base station. In the present disclosure, a method of performing side link communication without receiving scheduling information is referred to as Mode 2, but may be referred to differently. A transmitting terminal 1020a that wants to send data via a side link may send side link scheduling information and side link data to a receiving terminal 1020b based on the transmitting terminal's own judgment without receiving the scheduling of a base station. Here, the side link scheduling control information may include an SCI having the same format as the SCI used in mode 1 side link communication. For example, the scheduling control information may include at least one item shown in Table 18.

[0212] Fig.11A An example of a channel structure of a time slot for side link communication according to an embodiment of the present disclosure is shown. Fig.11AAn example of physical channels mapped to time slots for sidelink communications is shown. Fig.11A , the preamble 1101 is mapped to the position before the start of the time slot, that is, the back end of the previous time slot. Thereafter, starting from the time slot, PSCCH 1102, PSSCH 1103, GAP 1104, physical side link feedback channel (PSFCH) 1105 and GAP 1106 are mapped.

[0213] Before sending a signal in the corresponding time slot, the transmitting terminal sends a preamble signal 1101 in one or more symbols. The preamble can be used to enable the receiving terminal to correctly perform automatic gain control (AGC) so as to adjust the strength of amplification when the receiving terminal amplifies the power of the received signal. In addition, the preamble can be sent or not sent depending on whether the transmitting terminal performs the transmission of the previous time slot. That is, when the transmitting terminal sends a signal to the same terminal in the previous time slot (e.g., time slot #n-1) of the corresponding time slot (e.g., time slot #n), the transmission of the preamble 1101 can be omitted. The preamble 1101 can be referred to as a "synchronization signal", "side link synchronization signal", "side link reference signal", "intermediate signal", "initial signal", "wake-up signal" or other terms with equivalent technical meanings.

[0214] The PSCCH 1102 including control information is transmitted using a symbol transmitted at the beginning of a slot, and a PSSCH 1103 scheduled by the control information of the PSCCH 1102 may be transmitted. At least a portion of the SCI (i.e., control information) may be mapped to the PSCCH 1102. Thereafter, a GAP 1104 exists, and a PSFCH 1105 (i.e., a physical channel for transmitting feedback information) is mapped thereto.

[0215] The terminal may receive a preconfiguration of the position of the time slot in which the PSFCH can be transmitted. The description of receiving the preconfiguration may indicate that the preconfiguration is predetermined during the terminal manufacturing process, the preconfiguration is sent when accessing the side link related system, the preconfiguration is sent from the base station when accessing the base station, or the preconfiguration is sent from another terminal.

[0216] Reference Fig.11A , PSFCH 1105 is shown as being located at the last part of the time slot. By fixing GAP 1104 between PSSCH 1103 and PSFCH 1105, i.e., the part that is empty within a predetermined time, a terminal that has transmitted or received PSSCH 1103 can prepare to receive or transmit PSFCH 1105 (e.g., transmit / receive switching). After PSFCH 1105, there is GAP 1106 of the part that is empty within a predetermined time.

[0217] A terminal that wants to send data in the side link resource pool first performs an operation of searching for side link resources to determine the resources for data transmission. This may be referred to as channel sensing, which may be an operation of pre-searching resources for initial transmission and retransmission of specific data, transport blocks (TBs), or code blocks (CBs). In this channel sensing process, the resources found for initial transmission and retransmission may have resources of different sizes in the frequency domain. That is, only 1 subchannel or 10 PRBs may be used for initial transmission, while 4 subchannels or 40 PRBs may be used for retransmission.

[0218] Here, the TB sent through 1 subchannel at the time of initial transmission may have the same size as the TB sent at the time of retransmission. Therefore, the terminal may need a method for appropriately determining the TB size (TBS). The terminal for sending control information and data and the terminal for receiving control information and data can determine the size of the TB for sending or receiving by using a combination of one or more of the following methods.

[0219] The TBS determination method for sidelink data transmission can be summarized as follows.

[0220]

[0221] [Table 19]

[0222] index TBS index TBS index TBS index TBS 1 24 31 336 61 1288 91 3624 2 32 32 352 62 1320 92 3752 3 40 33 368 63 1352 93 3824 4 48 34 384 64 1416 5 56 35 408 65 1480 6 64 36 432 66 1544 7 72 37 456 67 1608 8 80 38 480 68 1672 9 88 39 504 69 1736 10 96 40 528 70 1800 11 104 41 552 71 1864 12 112 42 576 72 1928 13 120 43 608 73 2024 14 128 44 640 74 2088 15 136 45 672 75 2152 16 144 46 704 76 2216 17 152 47 736 77 2280 18 160 48 768 78 2408 19 168 49 808 79 2472 20 176 50 848 80 2536 21 18q 51 888 81 2600 22 192 52 928 82 2664 23 208 53 984 83 2728 24 224 54 1032 84 2792 25 240 55 1064 85 2856 26 256 56 1128 86 2976 27 272 57 1160 87 3104 28 288 58 1192 88 3240 29 304 59 1224 89 3368 30 320 60 1256 90 3496

[0223] [Table 20]

[0224]

[0225] In the method of determining TBS in side link data transmission / reception, a value less than 156, such as 144, may be used instead of the formula N. RE =min(156,N′ AE ).n PRB 1560 of

[0226] Alternatively, TBS can be given by the formula OK, N′ can be omitted in this process RE In the above case, the number of OFDM symbols allocated to PSSCH is It can be determined according to at least one of the following methods.

[0227] -Method A-1: It is the number of symbols to which the PSSCH is mapped in the time slot in which the PSSCH is transmitted.

[0228] -Method A-2: The maximum value of the number of symbols available for sidelink PSSCH transmission in the time slots configured in the resource pool in which the PSSCH is transmitted. For example, if one PSFCH is configured every two time slots in the corresponding resource pool, the time slots in which the PSFCH does not exist are determined based on -Method A-3: Determined as the minimum value of the number of symbols available for sidelink PSSCH transmission in the time slots configured in the resource pool in which the PSSCH is transmitted. For example, if one PSFCH is configured every two time slots in the corresponding resource pool, the time slot in which the PSFCH exists is determined according to -Method A-4: is determined as the average value of the number of symbols available for sidelink PSSCH transmission in the time slots configured in the resource pool for transmitting PSSCH. For example, if one PSFCH is configured every two time slots in the corresponding resource pool, then It is the average value of the number of available symbols for PSSCH in the time slots with PSFCH and in the time slots without PSFCH.

[0229] -Method A-5: It has a value determined by the upper limit of the average value of the number of symbols available for sidelink PSSCH transmission in the time slot configured for transmitting PSSCH in the resource pool.

[0230] -Method A-6: It has a value determined by the lower limit of the average value of the number of symbols available for sidelink PSSCH transmission in the time slot configured for transmitting PSSCH in the resource pool.

[0231] -Method A-7: It has a value determined by rounding off the average value of the number of symbols available for sidelink PSSCH transmission in a time slot configured for transmitting PSSCH in a resource pool.

[0232] In the case of using the above method, the first symbol of the side link that can be used for AGC purposes or the like is not included in In addition, symbols defined as gap symbols are not included in However, since the above is only an example, the embodiments of the present disclosure are not limited thereto, even when the first symbol of the side link is included in When the number of OFDM symbols is determined, Furthermore, these methods can be used even in the case of including symbols defined as gap symbols.

[0233] In addition, when determining When the second SCI is included, the mapped symbol may be included. In addition, when determining The number of OFDM symbols allocated to PSFCH can be excluded. Indicates the number of REs occupied by overhead in a PRB configured by high-level signaling. This value can be a (pre-)configured value in the resource pool. The value of may be not only 0, 6, 12 or 18 used by the NR system of the related art, but also a larger value may be applied, which may occur due to consideration of the second SCI. For example, The value of can be configured to be a value among 0, 6, 12, 18, 24, 30, 36, 42, etc., or one of the values ​​0, 6, 12, 18, 36, 60, 84, or 108.

[0234] [First embodiment]

[0235] According to an embodiment, the maximum data rate supported by the terminal may be different depending on the counterpart communicating with the terminal. That is, the maximum data rate supported by the terminal may be different depending on whether the terminal sends or receives data to a base station or another terminal. The maximum data rate supported by the terminal may be determined by formula 1, and at least one parameter in formula 1 may have different values ​​depending on the communication counterpart of the terminal. That is, the maximum data rate may vary depending on whether the terminal performs downlink and uplink transmission / reception operations or sidelink transmission / reception operations.

[0236] For example, when a terminal sends or receives data to a base station, OH (j) is the cost value, OH (j) In the downlink of FR1 (frequency band equal to or less than 6 GHz), it can be given as 0.14, in the uplink thereof as 0.18, in the downlink of FR2 (frequency band higher than 6 GHz), it can be determined as 0.08, in the uplink thereof as 0.10. On the other hand, when the terminal sends or receives data to another terminal, that is, in the side link, it can have OH in FR1 (frequency band equal to or less than 6 GHz). sub6 The value of OH in FR2 (frequency band above 6 GHz) sub6 Regardless of the configuration of PSFCH, OH sub6 The value of can have a value equal to or greater than a specific value. For example, OH sub6 The value of can have a value greater than 2 / 12. In the above case, OH sub6 and OH above6 It can be determined, for example, in the following method.

[0237] Method 1: OH sub6 It was determined to be 0.21, OH above6 It was determined to be 0.21.

[0238] Method 2: OH sub6 and OH above6 Each is determined according to the ratio of the time slots in which the PSFCH resources are configured or the period of the PSFCH resources in the resource pool configuration of the corresponding carrier. For example, if PSFCH is configured in each time slot, then OH sub6 and OH above6 can be determined as 0.42; if PSFCH is configured in one of every two time slots, then OH sub6 and OH above6 can be determined as 0.32; if PSFCH is configured in one of every four time slots, then OH sub6 and OH above6 can be determined as 0.26. These values ​​can be determined as and Specifically, OH sub6 and OH above6 Each can be determined according to the time slot ratio of the PSFCH resource configured in the resource pool configuration of the corresponding carrier as And OH sub6 and OH above6 Each may be determined by the sl-PSFCH-Period parameter included in the PSFCH configuration. When sl-PSFCH-Period as the PSFCH resource period is N, OH sub6 and OH above6 Each can be configured according to the resource pool of the corresponding carrier

[0239] For another example, when the terminal sends or receives data to the base station, OH (j) is the cost value, OH (j) In the downlink of FR1 (frequency band equal to or less than 6 GHz), it can be given as 0.14, in its uplink it can be given as 0.18, in the downlink of FR2 (frequency band above 6 GHz), it can be determined as 0.08, in its uplink it can be given as 0.10. On the other hand, when the terminal sends or receives data to another terminal, that is, in the side link, OH (j) The value may be determined according to a configuration value of a higher layer. For example, in order to perform transmission and reception of a physical sidelink shared channel (PSSCH), at least one sidelink resource pool may be configured in the terminal, and the OH may be determined according to the parameters of the resource pool with the largest bandwidth. (j) value.

[0240] Including the above method, for example, the maximum data rate can be determined as follows.

[0241] For NR, the approximate data rate for a given number of aggregated carriers in one band or band combination is calculated as follows.

[0242]

[0243] Where j is the number of component carriers aggregated in a frequency band or frequency band combination

[0244] R max =948 / 1024

[0245] For the jth CC,

[0246] The maximum number of supported layers is given by the maximum value of the higher layer parameter maxNumberMIMO-LayersPDSCH for the downlink and the higher layer parameters maxNumberMIMO-LayersCB-PUSCH and maxNumberMIMO-LayersNonCB-PUSCH for the uplink.

[0247] It is the maximum supported modulation order given by the higher-level parameter supportedModulationOrderDL for the downlink and the higher-level parameter supportedModulationOrderUL for the uplink.

[0248] f (j) It is the scaling factor given by the high-level parameter scalingFactor, which can take the values ​​1, 0.8, 0.75, and 0.4.

[0249] μ is a parameter (defined in TS 38.211 [6]).

[0250] is the average OFDM symbol duration of parameter μ in a subframe, i.e. Note that a normal cyclic prefix is ​​assumed.

[0251] is the maximum RB allocation in bandwidth BW(j) with parameter μ as defined in 5.3 TS 38.101-1 [2] and 5.3 TS 38.101-2 [3], where BW(j) is the maximum bandwidth supported by the UE in a given frequency band or frequency band combination.

[0252] OH (j) is the cost and takes the following values:

[0253] 0.14, frequency range for DL ​​FR1

[0254] 0.18, frequency range for DL ​​FR2

[0255] 0.08, for UL frequency range FR1

[0256] 0.10, for UL frequency range FR2

[0257] 0.21, for SL frequency range FR1

[0258] 0.21, for SL frequency range FR2

[0259] Note: For cells operating SUL, only one of the UL or SUL carriers is counted (the one with the higher data rate).

[0260] [Example (1-1)]

[0261] According to an embodiment, the maximum data rate supported by the terminal may be different depending on the counterpart communicating with the terminal. That is, the maximum data rate supported by the terminal may be different depending on whether the terminal sends or receives data to a base station or another terminal. The maximum data rate supported by the terminal may be determined by the following process.

[0262] For NR, the approximate data rate for a given number of aggregated carriers in one band or band combination is calculated as follows.

[0263]

[0264] in

[0265] J is the number of component carriers aggregated in a band or band combination

[0266] R max =948 / 1024

[0267] For the jth CC,

[0268] It is the maximum number of supported layers given by the maximum value of the higher layer parameter maxNumberMIMO-LayersPDSCH for the downlink and the higher layer parameters maxNumberMIMO-LayersCB-PUSCH, maxNumberMIMO-LayersNonCB-PUSCH for the uplink, maxNumberMIMO-LayersCB-PSSCH-TX for sidelink transmission and maxNumberMIMO-LayersCB-PSSCH-RX for sidelink reception.

[0269] It is the maximum supported modulation order given by the high-level parameter supportedModulationOrderDL for the downlink, the high-level parameter supportedModulationOrderUL for the uplink, the high-level parameter supportedModulationOrderSLTX for the sidelink transmission and the high-level parameter supportedModulationOrderSLRX for the sidelink reception.

[0270] f (j) It is the scaling factor given by the high-level parameter scalingFactor, which can take the values ​​1, 0.8, 0.75, and 0.4.

[0271] μ is a parameter (defined in TS 38.211 [6]).

[0272] is the average OFDM symbol duration of parameter μ in a subframe, i.e. Note that a normal cyclic prefix is ​​assumed.

[0273] is the maximum RB allocation in bandwidth BW(j) with parameter μ as defined in 5.3 TS 38.101-1 [2] and 5.3 TS 38.101-2 [3], where BW(j) is the maximum bandwidth supported by the UE in a given frequency band or frequency band combination.

[0274] OH (j) is the cost and takes the following values:

[0275] 0.14, frequency range for DL ​​FR1

[0276] 0.18, frequency range for DL ​​FR2

[0277] 0.08, for UL frequency range FR1

[0278] 0.10, for UL frequency range FR2

[0279] 0.21, for SL-TX frequency range FR1

[0280] 0.21, for SL-TX frequency range FR2

[0281] 0.21, for SL-RX frequency range FR1

[0282] 0.21, for SL-RX frequency range FR2

[0283] Note: For cells operating SUL, only one of the UL or SUL carriers is counted (the one with the higher data rate).

[0284] In the above, maxNumberMIMO-LayersPDSCH indicates the maximum number of layers that can be supported when receiving PDSCH in the downlink, and maxNumberMIMO-LayersNonCB-PUSCH indicates the maximum number of layers that can be supported when sending PUSCH through the uplink. In addition, in the above, maxNumberMIMO-LayersCB-PSSCH-TX and maxNumberMIMO-LayersCB-PSSCH-RX respectively indicate the maximum number of layers that can be supported in PSSCH transmission and reception of the side link.

[0285] In the above content, supportedModulationOrderDL represents the maximum modulation order that can be supported when receiving PDSCH in the downlink, and supportedModulationOrderUL represents the maximum modulation order that can be supported when sending PUSCH through the uplink. In addition, in the above content, supportedModulationOrderSLTX and supportedModulationOrderSLRX respectively represent the maximum modulation order that can be supported when sending and receiving in the side link. When determining the respective maximum data rates in the downlink, uplink and side link, the terminal and the base station can use at least one parameter related to each link. For example, in order to determine the maximum data rate of the side link, the parameters defined for the side link can be used. If separate parameters are not defined for each link, existing parameters can be used. For example, the side link transmitting terminal can use the existing uplink parameters, and the side link receiving terminal can use the existing downlink parameters.

[0286] For example, in determining the maximum transmission data rate in the side link, the terminal may determine the maximum transmission data rate in the side link by using the OH corresponding to the transmission in the frequency band used in the side link. (j) The maximum data rate is calculated by at least one of the following parameters: value, value configured by the maxNumberMIMO-LayersCB-PSSCH-TX parameter (indicating the maximum number of layers that can be supported in PSSCH transmission), or value configured by the supportedModulationOrderSLTX parameter (indicating the maximum modulation order that can be supported in PSSCH transmission). For example, in determining the maximum received data rate in the side link, the terminal may calculate the maximum data rate by using the OH corresponding to the reception in the frequency band used in the side link. (j)The maximum data rate is calculated based on at least one of the following values: the value configured by the maxNumberMIMO-LayersCB-PSSCH-TX parameter (indicating the maximum number of layers supported in PSSCH reception), or the value configured by the supportedModulationOrderSLTX parameter (indicating the maximum modulation order supported in PSSCH reception).

[0287] In the above, the following examples are described: maximum number of layers, maximum modulation order, and OH (j) The value has a separate value according to the communication counterpart (downlink / uplink and sidelink) of the terminal. However, this is just an example and does not mean that (j) and Parameters such as 1 and 2 do not have separate values ​​according to the communication counterpart. When other parameters have separate values ​​according to the communication counterpart of the terminal, the above method can be applied to other parameters.

[0288] [Example (1-2)]

[0289] According to an embodiment of the present disclosure, the maximum data rate supported by the terminal may be different depending on the counterpart with which the terminal communicates. That is, the maximum data rate supported by the terminal may be different depending on whether the terminal sends or receives data to a base station or another terminal. The maximum data rate supported by the terminal may be determined by the following process.

[0290] For NR, the approximate data rate for a given number of aggregated carriers in one band or band combination is calculated as follows.

[0291]

[0292] in

[0293] J is the number of aggregated component carriers in a band or band combination. For the NR sidelink, J=1.

[0294] R max =948 / 1024

[0295] For the jth CC,

[0296] It is the maximum number of supported layers given by the maximum value of the higher layer parameter maxNumberMIMO-LayersPDSCH for the downlink and the higher layer parameters maxNumberMIMO-LayersCB-PUSCH, maxNumberMIMO-LayersNonCB-PUSCH for the uplink, maxNumberMIMO-LayersCB-PSSCH-TX for sidelink transmission and maxNumberMIMO-LayersCB-PSSCH-RX for sidelink reception.

[0297] It is the maximum supported modulation order given by the high-level parameter supportedModulationOrderDL for the downlink, the high-level parameter supportedModulationOrderUL for the uplink, the high-level parameter supportedModulationOrderSLTX for the sidelink transmission and the high-level parameter supportedModulationOrderSLRX for the sidelink reception.

[0298] f (j) is the scaling factor given by the high-level parameter scalingFactor, which can take values ​​of 1, 0.8, 0.75, and 0.4. For the NR sidelink, f (j) is 1.

[0299] μ is a parameter (defined in TS 38.211 [6]).

[0300] is the average OFDM symbol duration in a subframe of parameter μ, that is, Note that a normal cyclic prefix is ​​assumed.

[0301] is the maximum RB allocation in bandwidth BW(j) with parameter μ as defined in 5.3 TS 38.101-1 [2] and 5.3 TS 38.101-2 [3], where BW(j) is the maximum bandwidth supported by the UE in a given frequency band or frequency band combination.

[0302] OH (j) is the cost and takes the following values:

[0303] 0.14, frequency range for DL ​​FR1

[0304] 0.18, frequency range for DL ​​FR2

[0305] 0.08, for UL frequency range FR1

[0306] 0.10, for UL frequency range FR2

[0307] 0.21, for SL-TX frequency range FR1

[0308] 0.21, for SL-TX frequency range FR2

[0309] 0.21, for SL-RX frequency range FR1

[0310] 0.21, for SL-RX frequency range FR2

[0311] Note: For cells operating SUL, only one of the UL or SUL carriers is counted (the one with the higher data rate).

[0312] In the above case, J may be the number of carriers that have undergone carrier aggregation (CA). Since CA is not supported in the side link, J may be determined to be 1. When CA is supported in the side link, J is determined to be the number of carriers that support CA in the side link. By considering that CA is not supported, the data rate may be determined according to the following formula.

[0313]

[0314] In the above content, f (j) represents the ratio index, f (j) The value may vary depending on the counterparty with which the terminal communicates. When the terminal sends or receives data to the base station, f (j) The value of can be configured through high-level signaling, and the f used when the terminal sends or receives data to another terminal (in the case of a side link) (j) The value of may be predefined as a specific value (eg, "1", but the present embodiment is not limited thereto) or may be configured through high-layer signaling. Considering the case where CA is not applied and f is always 1, the data rate may be determined according to the following formula.

[0315]

[0316] In the above, maxNumberMIMO-LayersPDSCH indicates the maximum number of layers that can be supported when receiving PDSCH in the downlink, and maxNumberMIMO-LayersNonCB-PUSCH indicates the maximum number of layers that can be supported when sending PUSCH through the uplink. In addition, in the above, maxNumberMIMO-LayersCB-PSSCH-TX and maxNumberMIMO-LayersCB-PSSCH-RX respectively indicate the maximum number of layers that can be supported when sending and receiving PSSCH through the side link.

[0317] In the above content, supportedModulationOrderDL represents the maximum modulation order that can be supported in PDSCH reception in the downlink, and supportedModulationOrderUL represents the maximum modulation order that can be supported when sending through PUSCH in the uplink. In addition, in the above content, supportedModulationOrderSLTX and supportedModulationOrderSLRX respectively represent the maximum modulation order that can be supported when sending and receiving in the side link.

[0318] The terminal and the base station may use at least one parameter associated with each link when determining the maximum data rate of each of the downlink, uplink, and sidelink. For example, to determine the maximum data rate of the sidelink, one or more parameters defined for the sidelink may be used. If separate parameters are not defined for each link, existing parameters (or parameters defined for another link) may be used. For example, a sidelink transmitting terminal may use existing uplink parameters, and a sidelink receiving terminal may use existing downlink parameters.

[0319] In the side link, it can be determined based on whether the terminal supports 256QAM That is, if the terminal does not support 256QAM when performing side link transmission, when calculating the maximum data rate of the side link transmission is determined to be 6 because it supports up to 64QAM. In addition, when supporting 256QAM, when calculating the maximum data rate sent through the bypass is determined to be 8. In the present disclosure, supporting 256QAM may mean that an MCS table of 256QAM may be used. Whether 256QAM is supported may be determined by high-layer signaling of a base station or high-layer signaling between terminals. For example, when the use of a 256QAM MCS table is configured by high-layer signaling or the use of a 256QAM MCS table is previously defined, the terminal may determine that 256QAM is supported.

[0320] In another embodiment, in the side link, It can be configured in the resource pool configured in the side link BWP, or it can be determined to be used according to a pre-configured MCS table. For example, if a specific terminal has such a configuration that the 256QAM MCS table can be used for at least one resource pool in the resource pool configured in the side link BWP, can be determined as 8, while in other cases, can be determined to be 6.

[0321] For example, in determining the maximum transmission data rate in the side link, the terminal may determine the maximum transmission data rate in the side link by using the OH corresponding to the transmission in the frequency band used in the side link. (j) The maximum data rate is calculated by at least one of the following values: a value configured by the maxNumberMIMO-LayersCB-PSSCH-TX parameter (indicating the maximum number of layers that can be supported in PSSCH transmission), a value configured by the supportedModulationOrderSLTX parameter (indicating the maximum modulation order that can be supported in PSSCH transmission). For example, in determining the maximum received data rate in the side link, the terminal may calculate the maximum data rate by using the value OH corresponding to the reception in the frequency band used in the side link. (j) , the maximum data rate is calculated based on at least one of the values ​​configured by the maxNumberMIMO-LayersCB-PSSCH-TX parameter (indicating the maximum number of layers supported in PSSCH reception) or the value configured by the supportedModulationOrderSLTX parameter (indicating the maximum modulation order supported in PSSCH reception).

[0322] In the above, the following examples are described: maximum number of layers, maximum modulation order, and OH (j) The value has a separate value according to the communication counterpart (downlink / uplink and sidelink) of the terminal. However, this is only an example and does not mean that (j) and Parameters such as 1 and 2 do not have separate values ​​according to the communication counterpart. When other parameters have separate values ​​according to the communication counterpart of the terminal, the above method can be applied to other parameters.

[0323] [Example (1-3)]

[0324] According to an embodiment of the present disclosure, the maximum data rate supported by the terminal may be different depending on the counterpart with which the terminal communicates. That is, the maximum data rate supported by the terminal may be different depending on whether the terminal sends or receives data to a base station or another terminal. The maximum data rate supported by the terminal may be determined by the following process. In this embodiment, the maximum data rate in the side link is determined according to the configured resource pool configuration, and may be determined according to the number of configured resource pools.

[0325] For NR, the approximate data rate for a given number of aggregated carriers in one band or band combination is calculated as follows.

[0326]

[0327] in

[0328] J is the number of aggregated component carriers in a band or band combination. For the NR sidelink, J is the number of resource pools (pre-)configured to the UE.

[0329] R max =948 / 1024

[0330] For the jth CC, (in the case of sidelink, for the jth resource pool).

[0331] It is the maximum number of supported layers given by the maximum value of the higher layer parameter maxNumberMIMO-LayersPDSCH for the downlink and the higher layer parameters maxNumberMIMO-LayersCB-PUSCH, maxNumberMIMO-LayersNonCB-PUSCH for the uplink, maxNumberMIMO-LayersCB-PSSCH-TX for sidelink transmission and maxNumberMIMO-LayersCB-PSSCH-RX for sidelink reception.

[0332] It is the maximum supported modulation order given by the high-level parameters supportedModulationOrderDL for the downlink, supportedModulationOrderUL for the uplink, supportedModulationOrderSLTX for the sidelink transmission and supportedModulationOrderSLRX for the sidelink reception.

[0333] f(j) is the scaling factor given by the high-level parameter scalingFactor, which can take the values ​​1, 0.8, 0.75, and 0.4.

[0334] μ is a parameter (defined in TS 38.211 [6]).

[0335] is the average OFDM symbol duration in a subframe of parameter μ, that is, Note that a normal cyclic prefix is ​​assumed.

[0336] is the maximum RB allocation of BW(j) in a bandwidth with parameter μ as defined in 5.3 TS 38.101-1 [2] and 5.3 TS 38.101-2 [3], where BW(j) is the maximum bandwidth supported by the UE in a given frequency band or frequency band combination.

[0337] OH (j) is the cost and takes the following values:

[0338] 0.14, frequency range for DL ​​FR1

[0339] 0.18, frequency range for DL ​​FR2

[0340] 0.08, for UL frequency range FR1

[0341] 0.10, for UL frequency range FR2

[0342] 0.21, for SL-TX frequency range FR1

[0343] 0.21, for SL-TX frequency range FR2

[0344] 0.21, for SL-RX frequency range FR1

[0345] 0.21, for SL-RX frequency range FR2

[0346] Note: For cells operating SUL, only one of the UL or SUL carriers is counted (the one with the higher data rate).

[0347] In the above case, J may be the number of carriers that have undergone carrier aggregation (CA). In the side link, J may be the number of resource pools configured for the terminal.

[0348] In the above, maxNumberMIMO-LayersPDSCH indicates the maximum number of layers that can be supported when receiving PDSCH in the downlink, and maxNumberMIMO-LayersNonCB-PUSCH indicates the maximum number of layers that can be supported when sending PUSCH through the uplink. In addition, in the above, maxNumberMIMO-LayersCB-PSSCH-TX and maxNumberMIMO-LayersCB-PSSCH-RX respectively indicate the maximum number of layers that can be supported in PSSCH transmission and reception of the side link.

[0349] In the above content, supportedModulationOrderDL indicates the maximum modulation order supported when receiving PDSCH in the downlink, and supportedModulationOrderUL indicates the maximum modulation order supported when sending PUSCH through the uplink. In addition, in the above content, supportedModulationOrderSLTX and supportedModulationOrderSLRX respectively indicate the maximum modulation order supported when sending and receiving in the side link.

[0350] The terminal and the base station may use at least one parameter associated with each link when determining the maximum data rate of each of the downlink, uplink, and sidelink. For example, to determine the maximum data rate of the sidelink, one or more parameters defined for the sidelink may be used. If separate parameters are not defined for each link, existing parameters (or parameters defined for another link) may be used. For example, a sidelink transmitting terminal may use existing uplink parameters, and a sidelink receiving terminal may use existing downlink parameters.

[0351] In the side link, This can be determined based on whether the terminal supports 256QAM. That is, if the terminal does not support 256QAM when sending side links in the corresponding resource pool, the maximum data rate of the side link transmission is calculated. is determined to be 6 because it supports up to 64QAM. In addition, when the terminal supports 256QAM, when calculating the maximum data rate sent by the side link is determined to be 8. Alternatively, if the configuration is to use the 256QAM MCS table in the corresponding resource pool, when calculating the maximum data rate is determined to be 8. If the configuration is not to use the 256QAM MCS table in the resource pool, when calculating the maximum data rate is determined to be 6. The case where the 256QAM MCS table is configured not to be used in the resource pool may indicate that the 256QAM table is not included in the available MCS table configured in the resource pool. Alternatively, in the case where 256QAM is supported in at least one resource pool configured for the terminal, when the terminal determines the maximum data rate of the side link, the MCS table of all resource pools is It can be determined to be 8. Supporting 256QAM in the resource pool can be a configuration in which the 256QAM MCS table is used through corresponding resource pool configuration information, or it can be a case of pre-configuration in the standard, so that the 256QAM MCS table is used. This configuration can be performed through high-level signaling of the base station or high-level signaling between terminals.

[0352] In another embodiment, in the side link, It can be configured in the resource pool configured in the side link BWP, or it can be determined according to a pre-configured MCS table. For example, if a specific terminal has such a configuration that a 256QAM MCS table can be used for at least one resource pool in the resource pool configured in the side link BWP, can be determined to be 8, otherwise can be determined to be 6.

[0353] For example, in determining the maximum transmission data rate in the side link, the terminal may determine the maximum transmission data rate in the side link by using the OH corresponding to the transmission in the frequency band used in the side link.(j) The maximum data rate is calculated by at least one of the following parameters: value, value configured by the maxNumberMIMO-LayersCB-PSSCH-TX parameter (indicating the maximum number of layers that can be supported in PSSCH transmission), or value configured by the supportedModulationOrderSLTX parameter (indicating the maximum modulation order that can be supported in PSSCH transmission). For example, in determining the maximum received data rate in the side link, the terminal may calculate the maximum data rate by using the OH corresponding to the reception in the frequency band used in the side link. (j) The maximum data rate is calculated based on at least one of the following values: the value configured by the maxNumberMIMO-LayersCB-PSSCH-RX parameter (indicating the maximum number of layers supported in PSSCH reception), the value configured by the supportedModulationOrderSLTX parameter (indicating the maximum modulation order supported in PSSCH reception). Alternatively, the OH value may be a value determined based on whether PSFCH is configured in the resource pool.

[0354] For example, if PSFCH is determined to be included in each time slot, the OH value may be 0.35 or 5 / 14, because a total of 5 symbols, including the first symbol as a repeated symbol used by AGC, two symbols of PSFCH, and gap symbols before and after PSFCH, may not be used for data transmission among the 14 symbols of one time slot. Alternatively, the OH value may be determined to be 0.45 by including the overhead of control information and DMRS symbols.

[0355] For another example, if the PSFCH is determined to be included in every two time slots, the OH value may be 0.21 or 3 / 14, because in the time slot where the PSFCH can be sent, the overhead of 5 symbols (including the first symbol of the repeated symbol used as the AGC, the two symbols of the PSFCH, and the gap symbols before and after the PSFCH) may not be used for data transmission, and in the time slot where there is no PSFCH resource, the overhead of 1 symbol (the first symbol used as the AGC) cannot be used for data transmission, so its average value may be 0.21. Alternatively, by including the overhead of the control information and DMRS symbols, the OH value may be determined to be 0.35.

[0356] For another example, if the PSFCH is determined to be included in every four time slots, the OH value may be 0.14, because in the time slot where the PSFCH can be transmitted, the overhead of 5 symbols cannot be used for data transmission, and in the time slot where there is no PSFCH resource, the overhead of 1 symbol cannot be used for data transmission, so the average value may be 0.14. Alternatively, by including the overhead of the control information and DMRS symbols, the OH value may be determined to be 0.28.

[0357] As another example, in a resource pool where PSFCH resources are not configured, the OH value can be 0.07. Because in a time slot where there are no PSFCH resources, the overhead of 1 symbol (the first symbol used by AGC) cannot be used for data transmission, the OH value can be configured to 0.28 by including the overhead of control information and DMRS symbols.

[0358] In the above, the following examples are described: maximum number of layers, maximum modulation order, and OH (j) The value has a separate value according to the communication counterpart (downlink / uplink and sidelink) of the terminal. However, this is just an example and does not mean that (j) and Parameters such as 1 and 2 do not have separate values ​​according to the communication counterpart. When other parameters have separate values ​​according to the communication counterpart of the terminal, the above method can be applied to other parameters.

[0359] [Second embodiment]

[0360] According to an embodiment, the terminal can determine the maximum data rate by calculating the maximum data rate according to the communication counterpart or by obtaining it from a stored value. In addition, the determined maximum data rate can be used to compare with the actual instantaneous data rate. This comparison can be performed by the following formula 2.

[0361] In the following formula 2, the left side of the inequality may represent the instantaneous data rate of the scheduled data, and the DataRateCC on the right side thereof (which may be determined according to the terminal capability) may represent the maximum data rate in the corresponding serving cell of the terminal. The DataRateCC on the right side may have a value determined according to whether the scheduling is for sending / receiving, for example, PDSCH or PUSCH to / from the base station or for sending / receiving, for example, PSSCH to / from the terminal.

[0362] [Formula 2]

[0363]

[0364] In the above content, L is the number of OFDM symbols allocated to PDSCH or PSSCH, and M is the number of TBs transmitted through the corresponding PDSCH or PSSCH. In the above content, L may also include AGC symbols transmitted by the terminal through the side link. is through Calculated, μ is the subcarrier spacing used to send PDSCH or PSSCH. For the mth TB, V j.m is based on Calculated, A is the size of TB (TBS), C is the number of code blocks (CBs) included in the TB, and C' is the number of code blocks scheduled in the TB. In the case of code block group (CBG) retransmission, C and C' may be different. Represents the largest integer not greater than x.

[0365] In the above content, DataRateCC is the maximum data rate supported by the terminal in the corresponding carrier or serving cell, which can be determined based on the above formula 1. Alternatively, DataRateCC can be calculated according to the following formula 3.

[0366] [Formula 3]

[0367]

[0368] Formula 3 is a formula showing an example of calculating DataRateCC of the j-th serving cell.

[0369] In Formula 3, R max =948 / 1024, is the maximum number of layers, is the maximum modulation order, f (j) is the ratio index, μ is the subcarrier spacing. The terminal can (j) is reported as one of 1, 0.8, 0.75 and 0.4, and μ can be given in Table 8 above. In addition, is the average OFDM symbol length, which can be Calculated as Binyue is the maximum number of RBs in BW(j). (j) is the overhead value, which can be given as 0.14 in the downlink of FR1 (frequency band equal to or less than 6 GHz) and 0.18 in its uplink; and can be given as 0.08 in the downlink of FR2 (frequency band higher than 6 GHz) and 0.10 in its uplink.

[0370] Different OH (j) The value may be applied to the side link, which may correspond to OH in FR1 (frequency band equal to or less than 6 GHz). sub6 and OH in FR2 (frequency band above 6 GHz) above6 Regardless of the configuration of the physical sidelink feedback channel (PSFCH), OH sub6 Can have a specific value or more. For example, OH sub6 can have a value greater than 2 / 12. Alternatively, OH (j)The value of may be determined by a higher-level configuration value. For example, one or more sidelink resource pools may be configured in the terminal for sending and receiving a physical sidelink shared channel (PSSCH), and OH (j) The value may be determined by the parameters of the resource pool with the largest bandwidth in the side link resource pool. (j) In addition, other values ​​may also apply different values ​​according to the link, that is, whether it is a downlink, uplink or sidelink, as described in the above embodiments.

[0371] For another example, another method for identifying whether the actual instantaneous data rate meets the terminal capability can be calculated based on the following formula 4. In the following formula 4, the left side of the inequality can represent the instantaneous data rate of data sent from J serving cells during scheduling, and the DataRate on the right side thereof can represent the maximum data rate of the J serving cells configured in the terminal according to the terminal capability. The DataRate on the right side can be a value determined according to whether the scheduling is used to send / receive, for example, PDSCH or PUSCH to / from the base station or to send / receive, for example, PSSCH to / from the terminal.

[0372] [Formula 4]

[0373]

[0374] In the above, J is the number of serving cells configured in the corresponding terminal in the corresponding frequency range. For the jth serving cell, M is the number of TBs transmitted in the time slot. In addition, it is defined as and μ(j) is the subcarrier spacing for PDSCH or PSSCH in the timeslot of the jth serving cell. For the mth TB, V j.m is calculated as A is the size of a TB (TBS), C is the number of code blocks (CBs) included in the TB, and C' is the number of code blocks scheduled in the TB. In the case of CBG retransmission, C and C' may be different. Represents the largest integer not greater than x.

[0375] In the above content, DataRate is the maximum data rate supported by J serving cells configured in the corresponding terminal, and can be determined based on Formula 1. In Formula 4, the actual average transmission rate of the terminal at a specific time (reference time) can be determined by considering the sum of the total number of TB or CB bits included in the PDSCH, PUSCH or PSSCH scheduled in the time slot including the specific time. In the above content, the time slot including the specific time can be as follows Fig.13 shown is determined.

[0376] In the above, an example of determining whether Formula 2 or 4 is satisfied has been described. As another example, considering that the terminal can perform sidelink transmission and reception in time slot units in the sidelink and receive data from various resource pools, one or a combination of the following methods may be applied.

[0377] Method 1: Terminal by using the following formula Compare the maximum data rate and the instantaneous data rate.TBS represents the TBS transmitted through (one or more) PSSCHs. is the time slot length.

[0378] Method 2: Terminal by using the following formula Compare the maximum data rate and the instantaneous data rate. TBS j Represents the TBS sent from the jth resource pool. is the time slot length.

[0379] When "DataRateCC 1 " is the maximum data rate in the service cell corresponding to the terminal when communicating with the base station, and "DataRateCC 2 " is the maximum data rate in the service cell corresponding to the terminal when communicating with another terminal, the terminal can determine the value applied to the right side of Formula 2 according to the communication counterpart. When communicating with the base station, the maximum data rate in the J service cells of the terminal is "DataRate 1 ", and the maximum data rate of the terminal in J service cells when communicating with another terminal is "DataRate 2 ", the terminal may determine the value applied to the right side of Formula 4 according to the communication counterpart. If the actual instantaneous data rate is greater than the value of DataRateCC or DataRate determined according to the communication counterpart, the terminal may omit the receiving or transmitting operation in the corresponding time slot. Specifically, the terminal may omit the operation of receiving PDSCH from the base station or sending PUSCH to the base station in the corresponding time slot, or may omit the operation of sending or receiving PSSCH in the corresponding time slot.

[0380] Fig. 11B Detailed description is a flowchart showing a method for determining whether a terminal performs PDSCH decoding, PUSCH transmission, and PSSCH reception according to an embodiment of the present disclosure. Fig. 11B, the method may start at 1100. The terminal may identify a peak data rate (DR_1) that can be supported in communication with a base station (operation 1107). The terminal may determine whether to perform additional V2X communication (operation 1110), and when the terminal needs to perform V2X communication additionally, that is, when the terminal needs to perform direct communication with another terminal, the terminal may identify a peak data rate (DR_2) that can be supported by the terminal in V2X communication (direct communication with another terminal) (operation 1115). The UE may monitor a PDCCH in a predetermined resource region such as a CORESET, and may determine whether a PDSCH or a PUSCH is scheduled due to monitoring of the PDCCH (operation 1120). When a PDSCH or a PUSCH is scheduled due to monitoring of the PDCCH, the terminal may compare the instantaneous data rate of the corresponding PDSCH or PUSCH with DR_1 (operation 1130), and if the instantaneous data rate exceeds DR_1, the terminal may ignore the corresponding scheduling (operation 1145). On the other hand, the terminal may perform a receiving or transmitting operation according to the corresponding scheduling (operation 1140). Due to the monitoring of the PDCCH, the terminal determines whether the PSSCH is scheduled (operation 1125), and when the PSSCH is scheduled, the terminal may compare the instantaneous data rate of the PSSCH with DR_2 (operation 1135), and when the instantaneous data rate exceeds DR_2, the terminal may ignore the corresponding scheduling (operation 1145). On the other hand, the PSSCH receiving operation (operation 1140) may be performed according to the corresponding scheduling.

[0381] [Third embodiment]

[0382] Regarding scheduling of retransmission, for example, even if retransmission is performed, if the conditions of Formula 2 or Formula 4 need to be satisfied, retransmission may not be scheduled in many cases.

[0383] Fig.12 An example is shown in which channel or side link symbols are mapped to time slots and used.

[0384] Reference Fig.12 , if TB1 satisfies the comparison between the maximum data rate and the instantaneous data rate in time slot n 1200, TB1 may be initially transmitted in time slot n 1200. In time slot n+1 1210 and time slot n+3 1220, TB1 may not satisfy the “comparison between the maximum data rate and the instantaneous data rate”. Therefore, TB1 may not be retransmitted in time slot n+1 1210 and time slot n+3 1220.

[0385] According to an embodiment, the comparison between the maximum data rate and the instantaneous data rate by using Formula 2 or Formula 4 may be applied differently depending on whether initial transmission or retransmission is performed. For example, the "comparison between the maximum data rate and the instantaneous data rate" using Formula 2 or Formula 4 is only applicable to the initial transmission between the terminal and another terminal, and in the case of retransmitting at least a portion of the data included in the initial transmission, the terminal may not perform the "comparison between the maximum data rate and the instantaneous data rate". That is, in the case of retransmission, the terminal may transmit or receive the PSSCH without performing the "comparison between the maximum data rate and the instantaneous data rate".

[0386] If at least one TB in the SCI sent via PSCCH has an I MCS If the value is greater than a certain value (W), the I MCS The value may be considered for sidelink retransmission of at least one TB. The MCS table used by the terminal may be configured by high-layer signaling such as mcs-Table-SL, and the specific value (W) corresponding to the retransmission may be determined according to the configured MCS table (MCS table 1, MCS table 2, or MCS table 3). For example, the terminal and the base station may understand that when MCS table 2 is configured, the case where the MCS value included in the SCI is greater than 27, that is, the case where the MCS value is 28, 29, 30, or 31, corresponds to the retransmission; and when MCS table 1 or MCS table 3 is configured, the case where the MCS value is greater than 28, that is, the case where the MCS value is 29, 30, or 31, corresponds to the retransmission.

[0387] [Fourth embodiment]

[0388] The present embodiment relates to a method and apparatus for scheduling and receiving data so as not to exceed the maximum data rate of a terminal when performing data transmission or retransmission.In the present and subsequent embodiments, data may be interchangeably referred to as TB or transport block.

[0389] When a terminal accesses a base station, the terminal capability may be reported to the base station, and the terminal capability may include at least one parameter capable of calculating the maximum data rate of the terminal, such as the maximum number of layers and the maximum modulation order supported by the terminal.

[0390] The maximum data rate of the terminal can be calculated based on the terminal capabilities reported to the base station and the parameters configured in the terminal by the base station through RRC signaling, for example, as given in Formula 1. The maximum data rate of the terminal can be determined based on the baseband processing or signal processing capabilities of the corresponding terminal, including channel estimation, equalization, channel coding and decoding, and multi-antenna reception. That is, if the terminal has a higher maximum data rate, it can be considered that the terminal has a higher signal processing capability. The terminal can calculate the "maximum data rate" for communicating with the base station and the "maximum data rate" for communicating with the terminal, respectively. For at least one parameter used in calculating the "maximum data rate", different values ​​can be used according to the communication counterpart. The parameter may include at least one parameter such as OH (j) Parameters.

[0391] The terminal may receive downlink control information or sidelink control information including scheduling information, may identify the scheduling information, and may calculate an actual instantaneous data rate by using at least one of the following methods.

[0392] The terminal can know the amount of data to be transmitted / received or the TBS value based on the scheduling information, and can also identify the number of symbols to which the PDSCH, PUSCH or PSSCH is mapped.

[0393] If the actual data rate calculated based on the information scheduled for the terminal is greater than the maximum data rate of the corresponding terminal, the terminal may not be able to complete the signal processing required to send and receive the scheduled data within the predetermined time. Therefore, the base station may need to schedule the actual instantaneous data rate to be less than the maximum data rate of the corresponding terminal. This is because when scheduling is performed so that the actual instantaneous data rate is greater than the maximum data rate of the terminal, the terminal will not complete the signal processing within the predetermined time, so the frequency time resources are inefficiently used.

[0394] The scheduling and data transmission / reception methods may be different according to the calculation method of the actual instantaneous data rate. As an example, the method of identifying whether the actual instantaneous data rate meets the terminal capability may be calculated based on Formula 2, for example.

[0395] Fig.13 An example of determining a time slot including a specific time in a carrier configured in a terminal through higher layer signaling according to an embodiment of the present disclosure is shown.

[0396] The length of the time slot may be different for each carrier according to the subcarrier spacing, and the indicated time slot corresponds to the time slot including the specific time. As the specific time changes, for example, the reference time A is changed to the reference time B, the time slot including the corresponding specific time may be changed from time slots A1, A2 and A3 to time slots B1, B2 and B3, for example.

[0397] Reference Fig.13 , time slot A1 and time slot B1 may be the same time slot, and time slot A2 and time slot B2 may be the same time slot. Therefore, for example, only the PDSCH, PUSCH or PSSCH mapped to the time slots including the reference time A corresponding to the specific time (i.e., time slots A1, A2 and A3) and transmitted are considered, and the code blocks transmitted in the PDSCH, PUSCH or PSSCH can be used when calculating the actual average transmission rate of the terminal at the reference time A.

[0398] When the reference time D is changed to the reference time E, the time slots D1, D2 and D3 including the reference time D are changed to the time slots E1, E2 and E3. In this case, all the time slots including the reference time are changed. Only when the actual transmission rate calculated as described above is scheduled to be less than the maximum transmission rate of the terminal itself calculated according to formula 1, the terminal can perform the operations of PDSCH reception, PUSCH transmission and PSSCH transmission / reception. If the calculated actual transmission rate is greater than the maximum transmission rate of the terminal itself, the PDSCH reception, PUSCH transmission and PSSCH transmission / reception operations in the corresponding time slot can be omitted. In the current and subsequent embodiments, the time slot including the reference time can be referred to as an overlapping time slot.

[0399] In the above, Formula 4 can be used as a condition applicable to all situations including initial transmission and retransmission, and Formula 2 can be used as a condition applicable to retransmission. However, Formula 2 or 4 is only an example of a condition for limiting scheduling and is not limited to the scope of the present disclosure.

[0400] For all cases where the base station schedules retransmission of a specific TB for a terminal, for example, if the scheduling is restricted to satisfy the condition of Formula 2, retransmission may not be scheduled in many cases.

[0401] In the above content, the base station "scheduling retransmission of a specific TB" for the terminal can represent the condition of "when MCS is greater than 27" when the following MCS table 2 is configured, or the condition of "when MCS is greater than 28" when a configuration other than MCS table 2 is established.

[0402] In actual retransmission of the NR system, scheduling is performed using all MCS values, and data transmission / reception can be performed. The scheduling of retransmission in the current and subsequent embodiments can be interpreted as scheduling using an MCS value greater than 27, that is, when scheduling is performed based on MCS table 2, the MCS value is 28, 29, 30, or 31. However, the present disclosure is not limited thereto, and the present disclosure can also be applied to the case of retransmission even if different MCS values ​​are used.

[0403] In addition, the retransmission scheduling in the current and subsequent embodiments may be interpreted as scheduling using an MCS value greater than 28, that is, when scheduling is performed based on a case other than MCS table 1 (Table 20) or MCS table 3 (Table 22) or MCS table 2 (Table 21), the MCS value is 29, 30, or 31. However, the present disclosure is not limited thereto, and the present disclosure may be applied to the case of retransmission even if a different MCS value is used.

[0404] [Table 20]

[0405]

[0406] [Table 21]

[0407]

[0408] [Table 22]

[0409]

[0410] Or, more specifically, the I of at least one TB in the DCI MCS The case where the value is greater than a certain value (W=27 or 28) can be assumed or considered as a retransmission. In the above content, according to the configuration related to the MCS table to be used, the configuration used for I MCS The specific value for comparison may be determined to be 27 or 28.

[0411] For example, the specific value W may be determined according to a higher-level parameter mcs-Table value included in a configuration related to PDSCH transmission, PUSCH transmission, or SPS transmission. For example, when "256-QAM" is configured, the specific value may be 27, and in other cases, the specific value may be 28.

[0412] For example, if 2-layer transmission based on 64-QAM in a frequency band of 100 MHz uses a subcarrier spacing of 120 MHz, and if the base station initially transmits one TB to the terminal using PDSCH using 7 symbols based on MCS 26, the base station may not be able to perform retransmission using the same 7 symbols. This is because a specific terminal may not be able to process scheduling that does not satisfy the condition of Formula 2.

[0413] Therefore, when retransmission is being performed, the case where the base station and the terminal consider the scheduling restriction condition (e.g., Formula 2) when determining subsequent operations may be limited to a specific case. Meanwhile, in the following, Formula 2 is described as an example of a scheduling restriction condition, but the embodiments of the present disclosure are not limited thereto.

[0414] As an example, the scheduling restriction condition may only apply when the number of symbols L allocated for PDSCH transmission for retransmission is less than 7. This may be a method of considering the condition given in Formula 2 when retransmission is performed or when the I of at least one TB in the DCI is MCS When the value is greater than a specific value (W=27 or 28), the PDSCH is mapped to symbols less than 7 and transmitted. That is, when the number of symbols L to which the PDSCH for retransmission is mapped is greater than or equal to 7, the condition of Formula 2 is not applied.

[0415] In the current and subsequent embodiments, when determining the number of symbols for PDSCH mapping, the number of symbols allocated to PDSCH transmission, or the number of symbols for PDSCH transmission, the demodulation reference signal (DMRS) symbol of PDSCH may also be included in the symbol for PDSCH transmission. That is, in order to determine the number of symbols, the DCI representing the PDSCH mapping information and the configuration information related to the symbol for PDSCH transmission sent through the high-layer signaling may be considered. Similar to the case of PUSCH, the symbol for PUSCH transmission may be determined to include the DMRS symbol of PUSCH.

[0416] In the above, the condition of Formula 2 is considered only when the PDSCH is mapped to a symbol less than 7 and is transmitted, because the scheduling frequency of data transmitted at the time of initial transmission being mapped to a symbol less than 7 is small, and there are many cases where data is mapped to a symbol greater than or equal to 7. According to the relaxation of these conditions, the complexity of the base station scheduling algorithm and the implementation method can be reduced.

[0417] In this embodiment, a method of comparing the number of symbols L to which the PDSCH for retransmission is mapped with 7 symbols has been described as an example. However, the scope of the present disclosure is not limited to 7 symbols, and can be extended and applied to comparison methods based on different numbers of symbols, such as 8 symbols or 9 symbols.

[0418] In addition to the embodiment of applying the scheduling restriction condition (Formula 2) based on whether retransmission occurs and the number of symbols of PDSCH, Formula 2 can be used as a condition applied in other cases. For example, when the UE reports the capability of fast processing time, when the higher-level parameter of Capability2-PDSCH-Processing is configured, or when processingType2Enabled in the higher-level parameter set of PDSCH-ServingCellConfig (or PUSCH-ServingCellConfig) is configured as "TRUE", the above Formula 2 can also be applied. In the above content, applying Formula 2 can mean identifying the condition of Formula 2, so data transmission / reception is enabled based on scheduling only when scheduling satisfies Formula 2.

[0419] [Fifth embodiment]

[0420] The present embodiments relate to a method and apparatus for scheduling and receiving data so as not to exceed a maximum data rate of a terminal when performing data transmission or retransmission.

[0421] When a terminal accesses a base station, UE capabilities may be reported to the base station. The UE capabilities may include at least one parameter capable of calculating a maximum data rate of the terminal, such as a maximum number of layers and a maximum modulation order that the terminal can support.

[0422] The maximum data rate of the terminal can be calculated based on the UE capabilities reported to the base station and the parameters configured in the terminal by the base station through RRC signaling, for example, as given in Formula 1. The maximum data rate of the terminal can be determined based on the baseband processing or signal processing capabilities of the corresponding terminal, including channel estimation, equalization, channel coding and decoding, and multi-antenna reception. That is, if the terminal has a higher maximum data rate, it can be considered that the terminal has a higher signal processing capability. The terminal can calculate the "maximum data rate" for communicating with the base station and the "maximum data rate" for communicating with the terminal, respectively. For at least one parameter used in calculating the "maximum data rate", different values ​​can be used according to the communication counterpart. The parameter may include at least one parameter such as OH (j) Parameters.

[0423] The terminal may receive downlink control information or sidelink control information including scheduling information, may identify the scheduling information, and may calculate an actual instantaneous data rate by using at least one of the following methods.

[0424] The terminal can know the amount of data to be transmitted / received or the TBS value based on the scheduling information, and can also identify the number of symbols to which the PDSCH, PUSCH or PSSCH is mapped.

[0425] If the actual data rate calculated based on the information scheduled for the terminal is greater than the maximum data rate of the corresponding terminal, the terminal may not be able to complete the signal processing required to send and receive the scheduled data within the predetermined time. Therefore, the base station may need to schedule the actual instantaneous data rate to be less than the maximum data rate of the corresponding terminal. This is because when scheduling is performed so that the actual instantaneous data rate is greater than the maximum data rate of the terminal, the terminal will not complete the signal processing within the predetermined time, so the frequency time resources are inefficiently used.

[0426] The scheduling and data transmission / reception methods may be different according to the calculation method of the actual instantaneous data rate described above. As an example, the method for identifying whether the actual instantaneous data rate meets the UE capability may be calculated based on, for example, Formula 2. In Formula 2 above, the left side of the inequality may represent the instantaneous data rate of the scheduled data, and the DataRateCC on the right side thereof (which may be determined based on the UE capability) may represent the maximum data rate in the corresponding service cell of the terminal. The DataRateCC on the right side may have a value determined based on whether the scheduling is for sending / receiving, for example, PDSCH or PUSCH to / from the base station or for sending / receiving, for example, PSSCH to / from the terminal.

[0427] As an example, another method of identifying whether the actual instantaneous data rate meets the UE capability can be calculated based on the above formula 4. In the following formula 4, the left side of the inequality can represent the instantaneous data rate of data sent from J serving cells during scheduling, and the DataRate on the right side thereof can represent the maximum data rate of the J serving cells configured in the terminal according to the UE capability. The DataRate on the right side can be a value determined according to whether the scheduling is used to send / receive, for example, PDSCH or PUSCH to / from the base station or to send / receive, for example, PSSCH to / from the terminal.

[0428] In the above, Formula 4 can be used as a condition applicable to all situations including initial transmission and retransmission, and Formula 2 can be used as a condition applicable to retransmission. However, Formula 2 or 4 is only an example of a condition for limiting scheduling, and is not limited to the scope of the present disclosure.

[0429] Regarding all cases where the base station schedules retransmission of a specific TB for a terminal, for example, if the scheduling is restricted to satisfy the condition of Formula 2, retransmission may not be scheduled in many cases. In the above content, the base station or another terminal "scheduling retransmission of a specific TB" for the terminal may mean a condition of "when MCS (indicated by an indicator included in DCI or SCI) is greater than 27" when MCS table 2 is configured, or a condition of "when MCS is greater than 28" when a configuration other than MCS table 2 is established. The details are the same as described above.

[0430] Or, more specifically, the I of at least one TB in the DCI MCS The case where the value is greater than a certain value (W=27 or 28) can be assumed or considered as a retransmission. In the above content, according to the configuration related to the MCS table to be used, the configuration used for I MCS The specific value for comparison may be determined to be 27 or 28.

[0431] For example, the specific value W may be determined according to the mcs-Table-SL value or the high-level parameter mcs-Table value included in the configuration related to PDSCH transmission, PUSCH transmission, PSSCH transmission or reception, or SPS transmission. For example, when "256QAM" is configured, the specific value may be 27, and in other cases, the specific value may be 28.

[0432] The specific value W may differ according to the table determined in MCS table 1, MCS table 2, and MCS table 3 for scheduling of data transmission.

[0433] For example, if a subcarrier spacing of 120 kHz is used for 2-layer transmission based on 64QAM in a frequency band of 100 MHz, and if a base station or a terminal has initially transmitted a TB to another terminal using PDSCH using 7 symbols based on MCS 26, the base station or the terminal may not be able to perform retransmission using the same 7 symbols. This is because a specific terminal may not be able to process scheduling that does not satisfy the condition of Formula 2.

[0434] Therefore, when retransmission is being performed, the case where the base station and the terminal consider the scheduling restriction condition (e.g., Formula 2) when determining subsequent operations may be limited to a specific case. Meanwhile, in the following, Formula 2 is described as an example of a scheduling restriction condition, but the embodiments of the present disclosure are not limited thereto.

[0435] As an example, when scheduling retransmission of a specific TB, a method may be used in which the condition of Formula 2 is applied only when the number of symbols L to which the PDSCH or PSSCH for retransmission is mapped is less than the number of symbols L' to which the PDSCH or PSSCH for initial transmission is mapped. That is, when the number of symbols L mapped to the PDSCH or PSSCH for retransmission is greater than or equal to the number of symbols L' mapped to the PDSCH or PSSCH for initial transmission, the condition of Formula 2 may not be applied.

[0436] In the current and subsequent embodiments, when determining the number of symbols for PDSCH or PSSCH mapping, the demodulation reference signal (DMRS) symbol for PDSCH or PSSCH may also be included in the symbol for PDSCH or PSSCH transmission. That is, in order to determine the number of symbols, all DCI or SCI representing PDSCH or PSSCH mapping information sent by high-level signaling and the symbol for PDSCH or PSSCH transmission may be considered. Similar to the case of PUSCH, the DMRS symbol of PUSCH may be determined to be included in the symbol for PUSCH transmission.

[0437] Therefore, when retransmission is performed or when at least one TB in DCI or SCI is MCS When the value is greater than a specific value (W=27 or 28), the scheduling restriction condition given by Formula 2 can be considered only when the PDSCH or PSSCH for retransmission is mapped to symbols and is transmitted, and the number of symbols is less than the symbols to which the PDSCH or PSSCH for initial transmission is mapped. This is because, in many cases, the base station performs initial transmission and retransmission by using the same number of symbols, thereby reducing the complexity of the base station scheduling algorithm and implementation method.

[0438] In addition to the embodiment of applying the scheduling restriction condition (i.e., Formula 2) based on whether retransmission occurs and the number of symbols of PDSCH or PSSCH, Formula 2 can be used as a condition applied to other situations. As an example, when the terminal reports the capability of fast processing time, when the higher-level parameter of Capability2-PDSCH-Processing is configured, or when processingType2Enabled in the higher-level parameter set of PDSCH-ServingCellConfig (or PUSCH-ServingCellConfig) is configured to "TRUE", the above Formula 2 can also be applied. In the above content, the application of Formula 2 can indicate that the condition of Formula 2 is identified, so data transmission / reception is enabled based on scheduling only when the scheduling satisfies Formula 2.

[0439] [Sixth embodiment]

[0440] The present embodiments relate to a method and apparatus for scheduling and receiving data so as not to exceed a maximum data rate of a terminal when performing data transmission or retransmission.

[0441] When a terminal accesses a base station, UE capabilities may be reported to the base station. The UE capabilities may include at least one parameter capable of calculating a maximum data rate of the terminal, such as a maximum number of layers and a maximum modulation order that the terminal can support.

[0442] The maximum data rate of the terminal can be calculated based on the UE capabilities reported to the base station and the parameters configured in the terminal by the base station through RRC signaling, for example, as given in Formula 1. The maximum data rate of the terminal can be determined based on the baseband processing or signal processing capabilities of the corresponding terminal, including channel estimation, equalization, channel coding and decoding, and multi-antenna reception. That is, if the terminal has a higher maximum data rate, it can be considered that the terminal has a higher signal processing capability. The terminal can calculate the "maximum data rate" for communicating with the base station and the "maximum data rate" for communicating with the terminal, respectively. For at least one parameter used in calculating the "maximum data rate", different values ​​can be used according to the communication counterpart. The parameter may include at least one parameter such as OH (j) Parameters.

[0443] The terminal may receive downlink control information or sidelink control information including scheduling information, may identify the scheduling information, and may calculate an actual instantaneous data rate by using at least one of the following methods.

[0444] The terminal can know the amount of data to be transmitted / received or the TBS value based on the scheduling information, and can also identify the number of symbols to which the PDSCH, PUSCH or PSSCH is mapped.

[0445] If the actual data rate calculated based on the information scheduled for the terminal is greater than the maximum data rate of the corresponding terminal, the terminal may not be able to complete the signal processing required to send and receive the scheduled data within the predetermined time. Therefore, the base station may need to schedule the actual instantaneous data rate to be less than the maximum data rate of the corresponding terminal. This is because when scheduling is performed so that the actual instantaneous data rate is greater than the maximum data rate of the terminal, the terminal will not complete the signal processing within the predetermined time, so the frequency time resources are inefficiently used.

[0446] The scheduling and data transmission / reception methods may be different according to the calculation method of the actual instantaneous data rate described above. As an example, the method for identifying whether the actual instantaneous data rate meets the UE capability may be calculated based on, for example, Formula 2. In Formula 2 above, the left side of the inequality may represent the instantaneous data rate of the scheduled data, and the DataRateCC on the right side thereof (which may be determined based on the UE capability) may represent the maximum data rate in the corresponding service cell of the terminal. The DataRateCC on the right side may have a value determined based on whether the scheduling is for sending / receiving, for example, PDSCH or PUSCH to / from the base station or for sending / receiving, for example, PSSCH to / from the terminal.

[0447] As an example, another method of identifying whether the actual instantaneous data rate meets the UE capability can be calculated based on the above formula 4. In the following formula 4, the left side of the inequality can represent the instantaneous data rate of data sent from J serving cells at the time of scheduling, and the DataRate on the right side thereof can represent the maximum data rate in the J serving cells configured in the terminal according to the UE capability. The DataRate on the right side can be a value determined based on whether the scheduling is used to send / receive, for example, PDSCH or PUSCH to / from the base station or to / from the terminal. For example, PSSCH is sent / received.

[0448] In the above, Formula 4 can be used as a condition applicable to all situations including initial transmission and retransmission, and Formula 2 can be used as a condition applicable to retransmission. However, Formula 2 or 4 is only an example of a condition for limiting scheduling, but is not limited to the scope of the present disclosure.

[0449] For all cases where the base station schedules retransmission of a specific TB for a terminal, for example, if the scheduling is restricted to satisfy the condition of Formula 2, retransmission may not be scheduled in many cases. In the above content, the base station or another terminal "scheduling retransmission of a specific TB" for the terminal may mean the condition of "when MCS (indicated by an indicator included in DCI or SCI) is greater than 27" when MCS table 2 is configured, or the condition of "when MCS is greater than 28" when a configuration other than MCS table 2 is established. The details are the same as described above.

[0450] Or, more specifically, the I of at least one TB in the DCI or SCI MCS The case where the value is greater than a certain value (W=27 or 28) can be assumed or considered as a retransmission. In the above content, according to the configuration related to the MCS table to be used, the configuration used for I MCS The specific value for comparison may be determined to be 27 or 28.

[0451] For example, the specific value W may be determined according to the mcs-Table-SL value or the high-level parameter mcs-Table value included in the configuration related to PDSCH transmission, PUSCH transmission, PSSCH transmission or reception, or SPS transmission. For example, when "256QAM" transmission is configured, the specific value may be 27, and in other cases, the specific value may be 28.

[0452] For example, if a subcarrier spacing of 120 kHz is used for 2-layer transmission based on 64QAM in a frequency band of 100 MHz, and if a base station or a terminal initially transmits one TB to another terminal by using a PDSCH of 7 symbols based on MCS 26, the base station or the terminal may not be able to perform retransmission by the same 7 symbols. This is because a specific terminal may not be able to process scheduling that does not satisfy the condition of Formula 2.

[0453] Therefore, when retransmission is being performed, the case where the base station and the terminal consider the scheduling restriction condition (e.g., Formula 2) when determining subsequent operations may be limited to a specific case. Meanwhile, in the following, Formula 2 is described as an example of a scheduling restriction condition, but the embodiments of the present disclosure are not limited thereto.

[0454] As an example, when scheduling retransmission of a specific TB, a method in which the condition of Formula 2 is applied may be used only when the number of symbols L to which the PDSCH or PSSCH for retransmission is mapped is less than the number of symbols L' to which the PDSCH or PSSCH for initial transmission is mapped and is less than 7. That is, when the number of symbols L mapped to the PDSCH or PSSCH for retransmission is equal to or greater than the number of symbols L' mapped to the PDSCH or PSSCH for initial transmission, or when the number of symbols L mapped to the PDSCH or PSSCH for retransmission is equal to or greater than 7, the condition of Formula 2 may not be applied.

[0455] As another example, when scheduling retransmission of a specific TB, a method in which the condition of Formula 2 is applied may be used only when the number of symbols L to which the PDSCH or PSSCH for retransmission is mapped is less than the smaller value between the number of symbols L' to which the PDSCH or PSSCH for initial transmission is mapped and 7. That is, when the number of symbols L to which the PDSCH or PSSCH for retransmission is mapped is less than min(L',7), the condition of Formula 2 may be applied.

[0456] In the current and subsequent embodiments, when determining the number of symbols for PDSCH or PSSCH mapping, the demodulation reference signal (DMRS) symbol of PDSCH or PSSCH may also be included in the symbol for PDSCH or PSSCH mapping. That is, in order to determine the number of symbols, all DCI or SCI representing PDSCH or PSSCH mapping information and symbols for PDSCH or PSSCH transmission sent by high-level signaling may be considered. Similar to the case of PUSCH, the DMRS symbol for PUSCH may be determined to be included in the symbol for PUSCH mapping.

[0457] Therefore, when retransmission is performed or when at least one TB in DCI or SCI is MCSWhen the value is greater than a specific value (W=27 or 28), the scheduling restriction condition given by Formula 2 can be considered only when the PDSCH or PSSCH for retransmission is mapped to a symbol and is transmitted, and the number of symbols is less than the symbol to which the PDSCH or PSSCH for initial transmission is mapped. This is because the complexity of the base station scheduling algorithm and implementation method can be reduced by the method proposed in this embodiment, which is based on the fact that the base station performs initial transmission and retransmission by using the same number of symbols in many cases. If more than 7 symbols are used, scheduling with a larger TBS often occurs.

[0458] In addition to the embodiment of applying the scheduling restriction condition (i.e., Formula 2) based on whether retransmission occurs and the number of symbols of PDSCH or PSSCH, Formula 2 can be used as a condition applied to other situations. As an example, when the terminal reports the capability of fast processing time, when the higher-level parameter of Capability2-PDSCH-Processing is configured, or when processingType2Enabled in the higher-level parameter set of PDSCH-ServingCellConfig (or PUSCH-ServingCellConfig) is configured to "TRUE", the above Formula 2 can also be applied. In the above content, applying Formula 2 can mean that the condition of Formula 2 is identified, so data transmission / reception is enabled based on scheduling only when the scheduling satisfies Formula 2.

[0459] [Seventh embodiment]

[0460] The present embodiments relate to a method and apparatus for scheduling and receiving data so as not to exceed a maximum data rate of a terminal when performing data transmission or retransmission.

[0461] When a terminal accesses a base station, UE capabilities may be reported to the base station. The UE capabilities may include at least one parameter capable of calculating a maximum data rate of the terminal, such as a maximum number of layers and a maximum modulation order that the terminal can support.

[0462] The maximum data rate of the terminal can be calculated based on the UE capabilities reported to the base station and the parameters configured in the terminal by the base station through RRC signaling, for example, as given in Formula 1. The maximum data rate of the terminal can be determined based on the baseband processing or signal processing capabilities of the corresponding terminal, including channel estimation, equalization, channel coding and decoding, and multi-antenna reception. That is, if the terminal has a higher maximum data rate, it can be considered that the terminal has a higher signal processing capability. The terminal can calculate the "maximum data rate" for communicating with the base station and the "maximum data rate" for communicating with the terminal, respectively. For at least one parameter used in calculating the "maximum data rate", different values ​​can be used according to the communication counterpart. The parameter may include at least one parameter such as OH (j) Parameters.

[0463] The terminal may receive downlink control information or sidelink control information including scheduling information, may identify the scheduling information, and may calculate an actual instantaneous data rate by using at least one of the following methods.

[0464] The terminal can know the amount of data to be sent / received or the TBS value based on the scheduling information, and can also identify the number of symbols mapped to the PDSCH, PUSCH or PSSCH.

[0465] If the actual data rate calculated based on the information scheduled for the terminal is greater than the maximum data rate of the corresponding terminal, the terminal may not be able to complete the signal processing required to send and receive the scheduled data within the predetermined time. Therefore, the base station may need to schedule the actual instantaneous data rate to be less than the maximum data rate of the corresponding terminal. This is because when scheduling is performed so that the actual instantaneous data rate is greater than the maximum data rate of the terminal, the terminal will not complete the signal processing within the predetermined time, so the frequency time resources are inefficiently used.

[0466] The scheduling and data transmission / reception methods may be different according to the calculation method of the actual instantaneous data rate described above. As an example, the method for identifying whether the actual instantaneous data rate meets the UE capability may be calculated based on, for example, Formula 2. In Formula 2 above, the left side of the inequality may represent the instantaneous data rate of the scheduled data, and the DataRateCC on the right side thereof (which may be determined based on the UE capability) may represent the maximum data rate in the corresponding service cell of the terminal. The DataRateCC on the right side may have a value determined based on whether the scheduling is for sending / receiving, for example, PDSCH or PUSCH to / from the base station or for sending / receiving, for example, PSSCH to / from the terminal.

[0467] As an example, another method of identifying whether the actual instantaneous data rate meets the UE capability can be calculated based on the above formula 4. In the following formula 4, the left side of the inequality can represent the instantaneous data rate of data sent from J serving cells at the time of scheduling, and the DataRate on the right side thereof can represent the maximum data rate in the J serving cells configured in the terminal according to the UE capability. The DataRate on the right side can be a value determined based on whether the scheduling is used to send / receive, for example, PDSCH or PUSCH to / from the base station or to / from the terminal. For example, PSSCH is sent / received.

[0468] In the above, Formula 4 can be used as a condition applicable to all situations including initial transmission and retransmission, and Formula 2 can be used as a condition applicable to retransmission. However, Formula 2 or 4 is only an example of a condition for limiting scheduling, but is not limited to the scope of the present disclosure.

[0469] For all cases where the base station schedules retransmission of a specific TB for a terminal, for example, if the scheduling is restricted to satisfy the condition of Formula 2, retransmission may not be scheduled in many cases. In the above content, the base station or another terminal "scheduling retransmission of a specific TB" for the terminal may mean the condition of "when MCS (indicated by an indicator included in DCI or SCI) is greater than 27" when MCS table 2 is configured, or the condition of "when MCS is greater than 28" when a configuration other than MCS table 2 is established. The details are the same as described above.

[0470] Or, more specifically, the I of at least one TB in the DCI or SCI MCS The case where the value is greater than a certain value (W=27 or 28) can be assumed or considered as a retransmission. In the above content, according to the configuration related to the MCS table to be used, the configuration used for I MCS The specific value for comparison may be determined to be 27 or 28.

[0471] For example, the specific value W may be determined according to an mcs-Table-SL value or a high-level parameter mcs-Table value included in a configuration related to PDSCH transmission, PUSCH transmission, PSSCH transmission or reception, or SPS transmission. For example, when "256-QAM" transmission is configured, the specific value may be 27, and in other cases, the specific value may be 28.

[0472] For example, if a subcarrier spacing of 120 kHz is used for 2-layer transmission based on 64QAM in a frequency band of 100 MHz, and if a base station or a terminal initially transmits a TB to another terminal by using a PDSCH or PSSCH using 7 symbols based on MCS 26, the base station or the terminal may not be able to perform retransmission using the same 7 symbols. This is because a specific terminal may not be able to process scheduling that does not satisfy the condition of Formula 2.

[0473] Therefore, when retransmission is being performed, the case where the base station and the terminal consider the scheduling restriction condition (e.g., Formula 2) when determining subsequent operations may be limited to a specific case. Meanwhile, in the following, Formula 2 is described as an example of a scheduling restriction condition, but the embodiments of the present disclosure are not limited thereto.

[0474] As an example, when scheduling retransmission of a specific TB, a method in which the condition of Formula 2 is applied may be used only when the number of symbols L to which the PDSCH or PSSCH for retransmission is mapped is less than L'-x relative to the number of symbols L' to which the PDSCH or PSSCH for initial transmission is mapped. That is, when the number of symbols L to which the PDSCH or PSSCH for retransmission is mapped is greater than or equal to the number of symbols L'-x to which the PDSCH or PSSCH for initial transmission is mapped, the condition of Formula 2 may not be applied.

[0475] In the above, the x value may be applied as a fixed value, such as 2 or 3, but may also be a value configured separately by the base station through high-layer signaling. For example, when the x value is configured as 2 or predetermined, the condition of Formula 2 may be applied when the number of symbols L' mapped by the PDSCH or PSSCH for retransmission is less than L'-2 relative to the number of symbols L' mapped by the PDSCH or PSSCH for initial transmission.

[0476] In the current and subsequent embodiments, when the number of symbols for PDSCH or PSSCH mapping is determined, the demodulation reference signal (DMRS) symbol of PDSCH or PSSCH may also be included in the number of symbols for PDSCH or PSSCH mapping. That is, in order to determine the number of symbols, all DCI or SCI representing PDSCH or PSSCH mapping information and symbols for PDSCH or PSSCH transmission sent by high-level signaling may be considered. Similar to the case of PUSCH, the DMRS symbol for PUSCH may be determined to be included in the symbol for PUSCH mapping.

[0477] Therefore, when retransmission is performed or when at least one TB in DCI or SCI is MCSWhen the value is greater than a specific value (W=27 or 28), the scheduling restriction condition given by Formula 2 can be considered only when the PDSCH or PSSCH for retransmission is mapped to a symbol and is transmitted, and the number of symbols is less than the symbol to which the PDSCH or PSSCH for initial transmission is mapped. In many cases, the base station performs initial transmission and retransmission by using the same number of symbols, or performs retransmission using symbols, where the number of symbols is less than 2. Based on the above situation, the complexity of the base station scheduling algorithm and implementation method can be reduced by the method proposed in this embodiment.

[0478] In addition to the embodiment of applying the scheduling restriction condition (i.e., Formula 2) based on whether retransmission occurs and the number of symbols of PDSCH or PSSCH, Formula 2 can be used as a condition applied to other situations. As an example, when the terminal reports the capability of fast processing time, when the higher-level parameter of Capability2-PDSCH-Processing is configured, or when processingType2Enabled in the higher-level parameter set of PDSCH-ServingCellConfig (or PUSCH-ServingCellConfig) is configured to "TRUE", the above Formula 2 can also be applied. In the above content, the application of Formula 2 can indicate that data transmission / reception will be enabled based on scheduling only when the scheduling satisfies Formula 2 by identifying the condition of Formula 2.

[0479] Next, the operation of the terminal will be described.

[0480] The terminal may recognize a condition for determining a subsequent operation method using DCI or SCI transmitted through the PDCCH.

[0481] According to an embodiment, as a result of identifying DCI or SCI, when initial transmission is performed, a subsequent operation method may be determined using the condition of the following Formula 5.

[0482] [Formula 5]

[0483]

[0484] According to an embodiment, when the I of at least one TB in the DCI or SCI MCS When the value is greater than a specific value (W=27 or 28), the terminal may use the instantaneous data rate condition of Formula 2 to determine the subsequent operation method. In the present disclosure, the instantaneous data rate condition may be used in the same manner as the above-mentioned scheduling restriction condition.

[0485] In the above and following embodiments, the MCS table to be used may be configured to be associated with I MCSThe specific value of the comparison is determined to be 27 or 28. For example, the specific value may be determined according to the mcs-Table-SL value or the high-level parameter mcs-Table value included in the configuration related to PDSCH transmission, PUSCH transmission, PSSCH transmission or reception, or SPS transmission. For example, when "256-QAM" transmission is configured, the specific value may be 27, and in other cases, the specific value may be 28.

[0486] For the receiving terminal, in the above case, J may be the total number of PSSCHs received by the terminal in one time slot.

[0487] In sidelink operation, the receiving terminal may select J so that Formula 5 satisfies the condition, and may select J PSSCHs from all received PSSCHs in descending order of priority (i.e., first select PSSCHs with higher QoS). If the PSSCHs have the same QoS, the selection may be determined randomly. Alternatively, the selection of the J PSSCHs may be determined in ascending order of the PRB index.

[0488] According to an embodiment, whether to use the instantaneous data rate condition of Formula 2 can be determined based on the length of the number of symbols L of the PDSCH or PSSCH used for retransmission, or can be determined by DCI or SCI scheduling, and / or based on the comparison result of the number of symbols L of the PDSCH or PSSCH used for retransmission and the number of symbols L' of the PDSCH or PSSCH used for initial transmission.

[0489] According to an embodiment, when the number of symbols L of the PDSCH or PSSCH for retransmission scheduled by the DCI or SCI is less than a specific number (for example, L<7) and the I of at least one TB in the DCI or SCI is MCS When the value is greater than a specific value (W = 27 or 28), the terminal can use the instantaneous data rate condition of formula 2 to determine the subsequent operation method. When the number of PDSCH or PSSCH symbols L for retransmission is equal to or greater than a specific number (for example, L ≥ 7) and the I of at least one TB in the DCI or SCI MCS When the value is greater than a specific value (W=27 or 28), the terminal can process the scheduled PDSCH or PSSCH without identifying whether the instantaneous data rate condition of Formula 2 is satisfied.

[0490] According to an embodiment, when the number of symbols L of the PDSCH or PSSCH for retransmission scheduled by the DCI or SCI is less than the number of symbols L' of the PDSCH or PSSCH for initial transmission (for example, L<L') and the I of at least one TB in the DCI or SCI is MCSWhen the value is greater than a specific value (W=27 or 28), the terminal can use the instantaneous data rate condition of formula 2 to determine the subsequent operation method. When the number of symbols L of the PDSCH or PSSCH used for retransmission is equal to or greater than the number of symbols L' of the PDSCH or PSSCH used for initial transmission (i.e., L≥L') and the I of at least one TB in the DCI or SCI is MCS When the value is greater than a specific value (W=27 or 28), the terminal can process the scheduled PDSCH or PSSCH without recognizing whether the instantaneous data rate condition of Formula 2 is satisfied.

[0491] According to an embodiment, when the number of symbols L of the PDSCH or PSSCH for retransmission scheduled by the DCI or SCI is less than the number of symbols L' of the PDSCH or PSSCH for initial transmission and a specific number (e.g., 7) (i.e., L<7 and L<L') and the I of at least one TB in the DCI or SCI is less than the number of symbols L' of the PDSCH or PSSCH for initial transmission, the number of symbols L' is less than the number of symbols L' of the PDSCH or PSSCH for initial transmission and a specific number (e.g., 7) (i.e., L<7 and L<L') MCS When the value is greater than a specific value (W=27 or 28), the terminal can use the instantaneous data rate condition of formula 2 to determine the subsequent operation method. When the number of symbols L of the PDSCH or PSSCH used for retransmission is equal to or greater than the initial specific number or the number of symbols L' of the PDSCH or PSSCH used for initial transmission (i.e., L≥7 or L≥L') and the I of at least one TB in the DCI or SCI MCS When the value is greater than a specific value (W=27 or 28), the terminal can process the scheduled PDSCH or PSSCH without recognizing whether the instantaneous data rate condition of Formula 2 is satisfied.

[0492] According to an embodiment, when the number of symbols L of the PDSCH or PSSCH for retransmission scheduled by the DCI or SCI is less than the minimum value of the number of symbols L' of the PDSCH or PSSCH for initial transmission and a specific number (for example, 7) (that is, L<min(7,L')), and the I of at least one TB in the DCI or SCI MCS When the value is greater than a specific value (W = 27 or 28), the terminal can use the instantaneous data rate condition of formula 2 to determine the subsequent operation method. When the number of symbols L of the PDSCH or PSSCH used for retransmission is equal to or greater than the minimum value of the number of symbols L' of the PDSCH or PSSCH initially transmitted and a specific number (for example, 7) (that is, L ≥ min (7, L')) and the I of at least one TB in the DCI or SCI MCS When the value is greater than a specific value (w=27 or 28), the terminal can process the scheduled PDSCH or PSSCH without recognizing whether the instantaneous data rate condition of Formula 2 is satisfied.

[0493] According to an embodiment, when the number of symbols L of the PDSCH or PSSCH for retransmission scheduled by DCI or SCI is less than the difference between the number of symbols L' of the PDSCH or PSSCH for initial transmission and a specific number of symbols x (i.e., L < L' - x)) and the I MCS value of at least one TB in the DCI or SCI is greater than a specific value (W = 27 or 28), the terminal can use the instantaneous data rate condition of Equation 2 to determine the subsequent operation method. When the number of symbols L of the PDSCH or PSSCH for retransmission is equal to or greater than the difference between the number of symbols L' of the PDSCH or PSSCH for initial transmission and a specific number of symbols x (i.e., L ≥ L' - x)) and the I MCS value of at least one TB in the DCI or SCI is greater than a specific value (W = 27 or 28), the terminal can process the scheduled PDSCH or PSSCH without identifying whether the instantaneous data rate condition of Equation 2 is satisfied. The value of x can be applied as a fixed value, such as 2 or 3. Alternatively, the value of x can be a value separately configured by the base station through higher layer signaling.

[0494] According to an embodiment, the terminal can determine the number of symbols L of the PDSCH or PSSCH for retransmission scheduled by DCI or SCI by including punctured symbols.

[0495] According to an embodiment, the terminal can determine the number of symbols L of the PDSCH or PSSCH for retransmission scheduled by DCI or SCI by excluding punctured symbols.

[0496] The above embodiments can be applied to the PUSCH in the same manner. The above embodiments can be applied to the physical sidelink shared channel (PSSCH) in the same manner.

[0497] [Eighth Embodiment]

[0498] Fig.14 Illustrates terminal operations for downlink reception or sidelink transmission / reception according to an embodiment of the present disclosure.

[0499] Referring to Fig.14 the terminal can perform monitoring of the PDCCH (or PSCCH, which also applies to the following Figures 14 to 20B cases) in a predetermined resource (operation 1410).

[0500] The terminal decodes the DCI sent by the base station through the PDCCH (or the SCI sent by another terminal through the PSCCH, which also applies to the following Figures 14 to 20BIf it is necessary to identify whether the instantaneous data rate condition is met, the terminal may identify whether the PDSCH or PSSCH scheduled by the corresponding DCI meets the instantaneous data rate condition (operation 1420).

[0501] If the instantaneous data rate condition is met, the terminal may perform an operation of receiving a scheduled PDSCH or transmitting and receiving a PSSCH (operation 1430).

[0502] If the instantaneous data rate condition is not met, the terminal may not perform an operation of receiving the scheduled PDSCH or an operation of sending and receiving the PSSCH (operation 1440). The terminal may stop buffering the PDSCH or PSSCH, or may not perform a buffering operation of the PDSCH or PSSCH. Although not shown, in the case where the terminal sends the PSSCH, when the instantaneous data rate condition is not met, the generation of the PSSCH may be stopped or the generation operation may not be performed.

[0503] [Ninth Embodiment]

[0504] Fig.15 is another diagram illustrating terminal operation for downlink reception or sidelink transmission / reception according to an embodiment of the present disclosure.

[0505] Reference Fig.15 , the terminal may perform PDCCH monitoring in predetermined resources (operation 1510).

[0506] The terminal decodes the DCI sent from the base station through the PDCCH, and can identify whether it is necessary to identify whether the instantaneous data rate condition is met. If it is necessary to identify whether the instantaneous data rate condition is met, the terminal can identify whether the PDSCH or PSSCH scheduled by the corresponding DCI meets the instantaneous data rate condition (operation 1520).

[0507] If the instantaneous data rate condition is met, the terminal may perform an operation of receiving a scheduled PDSCH or transmitting and receiving a PSSCH (operation 1530).

[0508] If the instantaneous data rate condition is not met, the terminal may perform PDSCH or PSSCH buffering (i.e., store the information value of PDSCH or PSSCH in the buffer), and if PDSCH or PSSCH corresponds to retransmission, the terminal may perform chase combining (CC) or incremental redundancy (IR) combining based on the log likelihood ratio (LLR) information stored in the soft buffer and corresponding to PDSCH or PSSCH according to the HARQ scheme (operation 1540). When the SNR or energy value of the buffered or combined result meets a specific condition, the terminal may start the decoding process. Alternatively, the terminal may start the decoding process after performing the combination more than a predetermined number of times, i.e., after receiving data retransmissions more than a predetermined number of times.

[0509] [Tenth embodiment]

[0510] Fig.16 is another diagram illustrating terminal operation for downlink reception or sidelink transmission / reception according to an embodiment of the present disclosure.

[0511] Reference Fig.16 , the terminal may perform PDCCH monitoring in predetermined resources or configured resources (operation 1610).

[0512] The terminal decodes the DCI sent from the base station through the PDCCH and can identify whether it is necessary to identify whether the instantaneous data rate condition is met. If it is necessary to identify whether the instantaneous data rate condition is met, the terminal can identify whether the PDSCH or PSSCH scheduled by the corresponding DCI meets the instantaneous data rate condition (operation 1620).

[0513] If the instantaneous data rate condition is met, the terminal may perform an operation of receiving the scheduled PDSCH (operation 1630).

[0514] If the instantaneous data rate condition is not met, the terminal may perform PDSCH or PSSCH buffering (1641), and may identify whether the PDSCH or PSSCH resource is punctured (1642). For example, the terminal may receive the configuration of at least one RNTI through RRC signaling, and a specific RNTI may be used to indicate whether the pre-allocated PDSCH or PSSCH resource is punctured. For example, such RNTI may be an INT-RNTI.

[0515] When RNTI is configured, the terminal may store only the LLR value of the data portion sent to the unpunctured resource in the soft buffer according to the HARQ scheme, and may perform CC combining or IR combining (operation 1643). The terminal may start the decoding process when the SNR or energy of the combined result value meets a specific condition. Alternatively, the terminal may start the decoding process after performing the combination more than a predetermined number of times, that is, after receiving retransmission more than a predetermined number of times. The terminal does not consider (or discards) the value according to the signal sent from the punctured resource.

[0516] [Eleventh Embodiment]

[0517] Fig.17 is another diagram illustrating a terminal operation for downlink reception or PSSCH transmission / reception according to an embodiment of the present disclosure, Fig.18 is another diagram illustrating a terminal operation for downlink reception or PSSCH transmission / reception according to an embodiment of the present disclosure.

[0518] Reference Fig.17 , the terminal may perform PDCCH monitoring in a predetermined resource or a configured resource (operation 1710). The terminal may perform an operation of receiving a PDSCH or PSSCH scheduled by a DCI transmitted through a PDCCH without classifying based on the length of the PDSCH or PSSCH and / or identifying whether an instantaneous data rate condition is met (operation 1720). In addition, the terminal may determine the resource (frequency and time) at which the HARQ-ACK information is to be transmitted through the transmitted DCI.

[0519] The terminal may configure HARQ-ACK information corresponding to the corresponding PDSCH or PSSCH as NACK before PDSCH decoding (operation 1730).

[0520] In addition, the terminal can identify whether the HARQ-ACK update timing has arrived (operation 1740). The terminal can determine the HARQ-ACK update timing according to the position of the HARQ-ACK transmission PUCCH resource on the time axis. For example, the HARQ-ACK update timing is a time point of a predetermined time before the start of the first symbol of the HARQ-ACK transmission PUCCH resource (for example, the PUCCH generation time of the HARQ-ACK transmission, and this can be determined by the UE capability). The terminal can determine the deadline and determine whether the deadline has been reached.

[0521] When the HARQ-ACK update timing is reached, and if the PDSCH or PSSCH decoding is completed, the terminal can update the corresponding HARQ-ACK information based on the result (operation 1750). For example, if the PDSCH or PSSCH decoding is successful, the terminal can update the corresponding HARQ-ACK information to ACK. If the PDSCH or PSSCH decoding is completed before the HARQ-ACK information transmission timing, so that the HARQ-ACK information is updated, the terminal sends the update information as the HARQ-ACK information, and if the PDSCH or PSSCH decoding is not completed before the HARQ-ACK transmission timing, so that the HARQ-ACK information is not updated, the terminal can send the pre-configured HARQ-ACK information (ie, NACK information).

[0522] At the same time, refer to Fig.18 When PDSCH or PSSCH decoding is not completed, the terminal may continue decoding even though the transmission time of HARQ-ACK information has passed (operation 1810).

[0523] The terminal identifies whether the PDSCH or PSSCH decoding is successful (operation 1820). If the decoding is successful, the terminal does not process the data retransmitted by the network through the PDSCH or by another terminal through the PSSCH, and can send ACK (retransmission according to DCI scheduling) in the newly designated HARQ-ACK information transmission resource (operation 1830). If the decoding is unsuccessful, the terminal can continue the decoding process after performing CC combination or IR combination based on the data retransmitted by the network through the PDSCH or by another terminal through the PSSCH according to the designated or determined HARQ scheme (operation 1840).

[0524] According to another embodiment, the terminal may perform PDCCH monitoring in predetermined resources or configured resources.

[0525] The terminal decodes the DCI sent from the base station through the PDCCH and can identify whether it is necessary to identify whether the instantaneous data rate condition is met. If it is necessary to identify whether the instantaneous data rate condition is met, the terminal can determine whether the PDSCH or PSSCH scheduled by the corresponding DCI meets the instantaneous data rate condition.

[0526] If the instantaneous data rate condition is met, the terminal may perform an operation of receiving the scheduled PUSCH or PSSCH. Although not shown, when the instantaneous data rate condition is not met, the terminal may not perform a preparation operation (e.g., data preparation according to a HARQ scheme) for sending the scheduled PUSCH or PSSCH.

[0527] According to another embodiment, the terminal may perform PDCCH monitoring in predetermined resources or configured resources.

[0528] The terminal may perform preparation operations (e.g., at least one of data preparation, scrambling, modulation, etc. according to a HARQ scheme) for sending a PUSCH or PSSCH scheduled by a DCI transmitted via a PDCCH without classifying the PUSCH or PSSCH according to the length of the PUSCH or PSSCH and / or identifying whether the instantaneous data rate condition is met.

[0529] The terminal can determine the resources (frequency and time) to send PUSCH or PSSCH based on DCI. Although not shown, when the preparation for PUSCH or PSSCH transmission is completed before the PUSCH transmission timing, the terminal can still perform PUSCH or PSSCH transmission on the scheduled PUSCH or PSSCH resources. If not, the terminal can stop the PUSCH or PSSCH transmission preparation operation.

[0530] According to another embodiment, the base station may perform an operation of receiving the PUSCH in resources (frequency and time) scheduled for the terminal by the DCI transmitted through the PDCCH.

[0531] The base station may perform an operation of detecting a DMRS in the scheduled resources. If the DMRS is detected, the base station may continue to perform an operation of receiving PUSCH data. If the DMRS is not detected, the base station may not perform an operation of receiving PUSCH data.

[0532] [Twelfth embodiment]

[0533] Fig.19 The operation of the base station according to an embodiment of the present disclosure is shown.

[0534] Reference Fig.19 , the base station may determine at least one of a frequency band to be used, a bandwidth of a carrier to be used in the frequency band, and a subcarrier spacing to be used (operation 1910). In addition, the base station may determine, for each terminal, a high-layer parameter (e.g., RRC parameter) related to an initial access terminal, a terminal of a new RRC configuration, a terminal in which a high-layer parameter has changed, and a terminal in which UE capability exchange has occurred (e.g., RRC parameter).

[0535] The base station can calculate the maximum data rate of each terminal using the above parameters and Formula 1. The base station can calculate the maximum data rate according to the communication counterpart with which the terminal communicates, that is, whether the terminal sends or receives data to the base station, or the terminal sends or receives data to another terminal (operation 1920).

[0536] In addition, the base station can calculate TBS thresholdValue (operation 1930). Here, TBS threshold The calculation may be based on the size of a specific resource, for example, at least one of the information related to the size of the specific resource, for example, the number of symbols having a specific length, etc. For calculating TBS threshold Another example of a parameter may be the number of symbols included in one slot.

[0537] Fig. 20A is another diagram illustrating the operation of a base station according to an embodiment of the present disclosure.

[0538] Since the scheduling of the initial transmission or the decoding of the initial transmission fails, it may be necessary to schedule for retransmission. Here, the base station may determine the terminal that needs such scheduling (operation 2010).

[0539] Reference Fig. 20A , the base station may determine the MCS of the scheduled terminal based on the determined channel state information (CSI) of the terminal, etc. (operation 2020).

[0540] In addition, the base station can recognize the TBS determined for each terminal. Threshold (Operation 2030), and can be based on TBS Threshold A scheduling resource size for the terminal is determined (operation 2040).

[0541] Fig. 20B An embodiment of determining scheduling resources of a terminal according to an embodiment of the present disclosure is shown.

[0542] According to an embodiment of determining the scheduling resource of the terminal, the base station may determine the minimum scheduling unit resource (operation 2041). The minimum scheduling unit resource may be N RBs (where N=1, 2, 3, ...).

[0543] Reference Fig. 20B , the base station may apply the minimum scheduling unit resource N differently according to a given situation. For example, the minimum scheduling unit resource may be 1 RB. The base station may compare the TBS of the terminal Threshold Is it satisfied, and at the same time, add minimum scheduling unit resources, for example, 1 RB each (operation 2043).

[0544] If, as a result of the comparison, TBS Threshold is satisfied (i.e., the TBS calculated based on the scheduled RBs is less than TBS Threshold ), the base station may additionally allocate minimum scheduling unit resources (operation 2045). Threshold (That is, when the TBS calculated based on the scheduled RBs is equal to or greater than the TBS Threshold ), the terminal can determine the number of scheduling unit resources (operation 2047).

[0545] According to another embodiment of determining the scheduling resources of the terminal, the base station may pre-calculate the TBS value corresponding to the minimum number of scheduling unit resources and store it in a table. Threshold The number of scheduling unit resources that are assigned a value, without having to calculate it when adding scheduling unit resources.

[0546] The base station may determine whether the scheduling resources of the determined size are available in the corresponding time slot. That is, the base station may determine whether the scheduling resources of the determined size can be included in the corresponding time slot. If the scheduling resources are available, the base station may finally determine to allocate resources to the corresponding terminal, and may send DCI or SCI corresponding thereto to the corresponding terminal through PDCCH. If the scheduling resources are not available, the base station may finally determine not to perform resource allocation in the corresponding time slot of the corresponding terminal, or may only perform allocation of available resources to the corresponding terminal, and send DCI or SCI corresponding thereto to the corresponding terminal through PDCCH.

[0547] In the above embodiment, an example of PDSCH transmission has been described, but the embodiment can be applied to PUSCH transmission or PSSCH transmission. In this case, the UE capability information and base station configuration information related to downlink transmission used in the above embodiment can be changed to UE capability information and base station configuration information related to uplink transmission and applied.

[0548] [Thirteenth embodiment]

[0549] The thirteenth embodiment provides a method for determining a data rate according to a frequency band or a combination of frequency bands used by a terminal for communication.

[0550] The maximum data rate of the side link of the terminal can be calculated as described in the first embodiment, the embodiment (1-1), the embodiment (1-2) and the embodiment (1-3), and can be determined according to the UE capability. In particular, the value of f as a scaling factor can be determined as described below.

[0551] f (j) It is the scaling factor given by the high-level parameter scalingFactor, which can take the values ​​1, 0.8, 0.75, and 0.4.

[0552] The value of f can be determined based on the scalingFactor parameter, which is a high-layer signaling. The parameter can be determined as one of 0.8, 0.75 and 0.4 (this does not limit the situation of adding new values). If the parameter is not configured or not reported, the parameter can be regarded as 1.

[0553] However, the scalingFactor parameter may be a parameter value reported or sent by the terminal to the base station or to a neighboring terminal. This value may vary depending on the frequency band supported by the terminal or its frequency band combination, and may be transmitted using one of the following methods or a combination of the following methods.

[0554] -Method 1: Use per-Uu-band-combination to determine the scaling factor

[0555] -Method 2: Use per-PC5-band-combination to determine the scaling factor

[0556] - Method 3: Use per-Uu-band-combination-and-per-PC5-band-combination to determine the scaling factor

[0557] -Method 4: Use per-PC5-band to determine the scaling factor

[0558] For example, in the case of using method 1, if the combination of (Uu band 1, Uu band 2) corresponds to (band 3, band 5), respectively, the value of f can be configured as 0.4 and 0.75. In the case of a combination of different bands, the value of f may be different even if the bands have the same number.

[0559] In the case of using the above-mentioned method 3, the baseband processing capability that the terminal can use in the PC5 band may vary depending on whether the Uu band in which the terminal performs operations such as DL reception or UL transmission is activated. On the other hand, the baseband processing capability that the terminal can use in the Uu band may vary depending on whether the terminal activates the PC5 band, that is, whether the terminal performs a side link operation, or whether the terminal activates the V2X function. That is, since the baseband processing capability that the terminal can actually use varies depending on whether the Uu and PC5 bands are activated, it is necessary to change the f value (used to calculate the data rate) that the terminal should apply.

[0560] From the perspective of the base station, even when scheduling the DL and UL data transmissions of the terminal, the DL and UL data scheduling methods may need to change depending on whether the terminal activates the PC5 band, that is, whether the terminal is performing a sidelink operation, or whether the terminal activates the V2X function. That is, the maximum DL TBS or maximum UL TBS that can be scheduled by the base station for the terminal can be determined according to whether the terminal performs a sidelink operation. For example, depending on whether the terminal is performing a sidelink operation, the maximum TBS that can be scheduled for the terminal in DL or UL may be different. For example, if the terminal is performing a sidelink operation in the PC5 band, the maximum TBS that can be scheduled in DL or UL may be smaller. On the other hand, if the terminal is not performing a sidelink operation in PC5, the maximum TBS that can be scheduled in DL or UL may be larger. However, since the base station does not know whether the terminal is performing a sidelink operation on the PC5 band, the base station may not know how to perform scheduling.

[0561] In order to solve the above problems, the following methods can be considered.

[0562] -Method 1: The terminal can transmit information of the PC5 band or information of the PC5 band combination (eg, a band list) to the base station, and the information is being activated by the terminal itself. The information can be transmitted via high-layer signaling (RRC signaling, UE capability) and the like.

[0563] -Method 2: The base station may transmit information about the frequency band combination currently applied by the base station to the terminal in order to perform scheduling for the terminal. The frequency band combination information may be configured for the terminal as configuration information. That is, this is a method of configuring the frequency band combination applied by the base station to the corresponding terminal. The configured frequency band combination may be one of those frequency bands included in the UE capabilities reported by the terminal to the base station.

[0564] -Method 3: The base station can schedule the terminal under the following assumption: If the PC5 band is included in the band combination reported by the terminal through the UE capability, the terminal always activates the PC5 band. For example, when the terminal reports the n71 band and reports the band combination of n71-n47 at the same time, if the base station performs scheduling for the terminal in the n71 band, the base station can perform DL and UL scheduling by considering the scaling factor of the band combination of n71-n47 reported by the terminal, and can perform data scheduling within the maximum TBS corresponding thereto.

[0565] -Method 4: The terminal may transmit information of the Uu frequency band or information of a combination of Uu frequency bands (eg, a frequency band list) to other neighboring terminals, and the information is being activated by the terminal itself. The information may be transmitted via high-layer signaling (RRC signaling, UE capability) and the like.

[0566] - Method 5: When performing data transmission through the side link, the terminal can generate a side link TBS to perform data transmission assuming that the capability of the neighboring terminal has a minimum value (0.4 in the above example) in the scalingFactor value in the corresponding side link frequency band.

[0567] -Method 6: The terminal may determine whether to perform DL data (PDSCH) reception and UL data (PUSCH) transmission scheduled by the base station differently according to whether the terminal itself is currently performing PC5 operation. That is, when the terminal reports f=1 for the n71 band (or may not report the f value), and reports f=0.75 for the n71-n47 band combination, that is, the proportional value in the n71 band, if the terminal performs transmission / reception or related operations in the sidelink band of the n47 band, the terminal may determine whether to perform DL data (PDSCH) reception and UL data (PUSCH) transmission in the n71 band according to the maximum data rate of the n71 band calculated based on f=0.75.

[0568] On the other hand, in the above example, when the terminal does not perform transmission / reception or operations related thereto in the sidelink frequency band n47, the terminal can determine whether to perform DL data (PDSCH) reception and UL data (PUSCH) transmission in the n71 frequency band based on the maximum data rate calculated based on f = 1. On the other hand, even in the case of the side link, based on the data rate of the side link to be calculated when determining whether to transmit / receive the sidelink data PSSCH, the required sidelink f value can be determined differently depending on whether the sidelink operation is performed in the Uu frequency band.

[0569] The maximum data rate can be calculated based on the UE capabilities reported to the base station and the parameters configured by the base station for the terminal through RRC signaling, for example, as given in Formula 1. The maximum data rate of the terminal can be determined based on the baseband processing or signal processing capabilities of the corresponding terminal, including channel estimation, equalization, channel coding and decoding, and multi-antenna reception. That is, if the terminal has a higher maximum data rate, it can be considered that the terminal has a higher signal processing capability. The terminal can calculate the "maximum data rate" for communicating with the base station and the "maximum data rate" for communicating with another terminal respectively. Depending on different communication counterparts, at least one parameter used in calculating the "maximum data rate" can use different values. The parameter may include at least one parameter such as f, which is a scalingFactor.

[0570] The operation of the terminal executing the present embodiment may be, for example, as follows: The operation of the terminal does not need to execute all the described operations, and may execute one or more operations described below, and the order thereof may be changed.

[0571] Fig.21 The operation of executing the terminal according to the embodiment of the present disclosure is shown.

[0572] Reference Fig.21 , the terminal may send the capability information of the terminal itself to the base station (operation 2100). The capability information may include information of a frequency band combination of a Uu band and a PC5 band (supportable by the terminal) that are considered to be able to coexist. Thereafter, the terminal reports to the base station whether the terminal itself operates the side link (or it can be understood as whether the terminal is performing the side link operation, whether the terminal has activated the V2X function, etc.) (operation 2110). Thereafter, the base station may schedule signal transmission / reception for the terminal by considering the UE capability information (operation 2130). The terminal may calculate the "maximum data rate" for communicating with the base station and / or the "maximum data rate" for communicating with another terminal by using the proportional factor parameter configured according to the current embodiment, depending on whether the side link is operated (operation 2140). Thereafter, the terminal may send or receive a signal to the base station and / or another terminal based on the calculated maximum data rate, or determine whether transmission or reception has been performed.

[0573] Fig. 22 and Fig.23 1 and 2 respectively show a transmitter, a receiver and a processor of a terminal and a base station for executing an embodiment of the present disclosure. In order to calculate the actual data rate and perform the transmission / reception method according to at least one of the various embodiments, the receiver, the processor and the transmitter of the base station and the terminal may operate according to the above embodiments.

[0574] Fig. 22 is a block diagram of a terminal according to an embodiment of the present disclosure.

[0575] Reference Fig. 22 , the terminal of the present disclosure may include a terminal receiver 2200, a terminal transmitter 2202, and a terminal processor 2204. In the present disclosure, the terminal receiver 2200 and the terminal transmitter 2202 may be collectively referred to as a transceiver. The transceiver may receive a signal to or from a base station. Here, the signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplifying the received signal and down-converting the frequency of the received signal.

[0576] In addition, the transceiver can receive a signal through a wireless channel, output the signal to the terminal processor 2204, and send the signal output by the terminal processor 2204 through the wireless channel. The terminal processor 2204 can control a series of processes so that the terminal can operate according to the above-mentioned embodiment. For example, the terminal receiver 2200 receives data and control information from the base station, which includes scheduling information for data transmission, and the terminal processor 2204 can compare the peak data rate of the terminal and the amount of scheduled data, and determine whether to decode and send, and perform signal processing accordingly. Thereafter, the signal that needs to be sent by the terminal transmitter 2202 can be sent to the base station or another terminal.

[0577] Fig.23 is a block diagram of a base station according to an embodiment of the present disclosure.

[0578] Reference Fig.23 , the base station of the present disclosure may include a base station receiver 2301, a base station transmitter 2303 and a base station processor 2305. In the present disclosure, the base station receiver 2301 and the base station transmitter 2303 may be collectively referred to as a transceiver. The transceiver may send a signal to a terminal or receive a signal from a terminal. Here, the signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplifying the received signal and down-converting the frequency of the received signal. In addition, the transceiver may receive a signal through a wireless channel, output the signal to the base station processor 2305, and send the signal output by the base station processor 2305 through a wireless channel.

[0579] The base station processor 2305 can control a series of processes so that the base station can operate according to the above embodiment. For example, the base station processor 2305 can calculate the peak data rate of the terminal, determine the TBS within the range not exceeding the peak data rate, and schedule the TBS to generate control information.

[0580] Thereafter, the control information generated by the base station transmitter 2303 may be sent, and the base station receiver 2301 may receive the uplink data signal and the feedback of the terminal.

[0581] In order to solve the above problems, the present disclosure provides a method for a terminal in a wireless communication system, the method comprising: monitoring a physical downlink control channel (PDCCH); identifying whether to determine a scheduling restriction condition based on downlink control information (DCI) decoded as a monitoring result; if the scheduling restriction condition needs to be determined, identifying whether a physical downlink shared channel (PDSCH) scheduled by the DCI satisfies the scheduling restriction condition; and receiving data from a base station via the PDSCH when the scheduling restriction condition is met.

[0582] In order to solve the above problems, the present disclosure provides a terminal, including: a transceiver; and a controller, which is configured to: monitor a physical downlink control channel (PDCCH); identify whether to determine a scheduling restriction condition based on downlink control information (DCI) decoded as a monitoring result; if the scheduling restriction condition needs to be determined, identify whether a physical downlink shared channel (PDSCH) scheduled by the DCI satisfies the scheduling restriction condition; and receive data from a base station via the PDSCH when the scheduling restriction condition is met.

[0583] In the drawings describing the methods of the present disclosure, the order in which the description is performed does not always correspond to the order in which the operations of each method are performed, and the sequential relationship between the operations may be changed or the operations may be performed in parallel.

[0584] Alternatively, in the drawings describing the method of the present disclosure, some elements may be omitted and only some elements may be included without departing from the basic spirit and scope of the present disclosure.

[0585] Furthermore, in the method of the present disclosure, part or all of the content of each embodiment may be combined without departing from the basic spirit and scope of the present disclosure.

[0586] Although the present disclosure has been shown and described with reference to its various embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents. In addition, the above-mentioned various embodiments may be used in combination when necessary. For example, embodiments 1 and 2 may be used in combination, or a portion of embodiment 1 and a portion of embodiment 2 may be used in combination. In addition, based on the technical idea of ​​the present embodiment, other variants of the above-mentioned embodiments may be implemented in LTE and 5G systems.

Claims

1. A method performed by a terminal in a communication system, the method comprising: obtaining at least one parameter identifying a data rate for sidelink communications; as well as The data rate is identified based on the at least one parameter and the following formula: The at least one parameter includes an overhead parameter OH, a modulation parameter Q m , scaling factor f and the maximum number of supported layers v Layers , where R max is equal to 948 / 1024, indicates the average OFDM symbol duration in a subframe of parameter set μ, Indicates the maximum number of resource blocks RB in the bandwidth BW with parameter set μ, the Q m is the maximum supported modulation order of the terminal, Wherein, when the terminal supports 256 quadrature amplitude modulation, the modulation parameter Q m Corresponding to 8, Wherein, when the terminal does not support the 256-bit quadrature amplitude modulation, the modulation parameter Q m Corresponding to 6, The at least one parameter is defined for a side link between the terminal and another terminal, wherein the value of the overhead parameter is based on a frequency range associated with a sidelink communication of another terminal, and Among them, the value of the overhead parameter in the frequency range below 6 GHz is greater than 2 / 12.

2. The method according to claim 1, wherein: The scaling factor f is configured by high-layer signaling.

3. The method according to claim 2, wherein: One value of the scaling factor is 1.

4. The method according to claim 1, wherein: The v Layers It is the maximum number of supportable layers configured by higher layer signaling for communicating with another terminal.

5. The method according to claim 1, wherein: In the case of supporting the 256-bit quadrature amplitude modulation, a high-layer parameter indicating that the terminal supports the 256-bit quadrature amplitude modulation is sent.

6. A terminal in a communication system, the terminal comprising: Transceiver; as well as A controller coupled to the transceiver, the controller being configured to: obtaining at least one parameter identifying a data rate for sidelink communications; as well as The data rate is identified based on the at least one parameter and the following formula: The at least one parameter includes an overhead parameter OH, a modulation parameter Q m , scaling factor f and the maximum number of supported layers v Layers , where R max is equal to 948 / 1024, indicates the average OFDM symbol duration in a subframe of parameter set μ, Indicates the maximum number of resource blocks RB in the bandwidth BW with parameter set μ, the Q m is the maximum supported modulation order of the terminal, Wherein, when the terminal supports 256 quadrature amplitude modulation, the modulation parameter Q m Corresponding to 8, Wherein, when the terminal does not support the 256-bit quadrature amplitude modulation, the modulation parameter Q m Corresponding to 6, wherein the at least one parameter is defined for a sidelink between the terminal and another terminal, wherein a value of the overhead parameter is based on a frequency range associated with sidelink communications with the other terminal, and Among them, the value of the overhead parameter in the frequency range below 6 GHz is greater than 2 / 12.

7. The terminal according to claim 6, wherein: The scaling factor f is configured by high-layer signaling.

8. The terminal according to claim 7, wherein: One value of the scaling factor is 1.

9. The terminal according to claim 6, wherein: The v Layers The maximum number of supportable layers configured by higher layer signaling for communicating with the other terminal.

10. The terminal according to claim 6, wherein: In the case of supporting the 256-bit quadrature amplitude modulation, a high-layer parameter indicating that the terminal supports the 256-bit quadrature amplitude modulation is sent.

Images