CN113767656A

CN113767656A - Method and apparatus for data transmission and reception in wireless communication system

Info

Publication number: CN113767656A
Application number: CN202180002649.5A
Authority: CN
Inventors: 吕贞镐; 尹洙夏; 柳贤锡; 申哲圭; 朴成珍; 方钟弦; 吴振荣
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2020-04-03
Filing date: 2021-04-05
Publication date: 2021-12-07
Also published as: KR20210123993A

Abstract

The present disclosure relates to a communication technology for combining an 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 may be applied to smart services based on 5G communication technology and IoT related technology (e.g., smart homes, smart buildings, smart cities, smart cars or networked cars, healthcare, digital education, retail business, security and security related services, etc.).

Description

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

Technical Field

The present disclosure relates to a communication system. More particularly, the present disclosure relates 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

In order to meet the increasing demand for wireless data traffic since the deployment of fourth generation (4G) communication systems, efforts have been made to develop improved fifth generation (5G) or pre-5G communication systems. Accordingly, 5G or pre-5G communication systems are also referred to as "beyond 4G networks" or "Long Term Evolution (LTE) systems". 5G communication systems are considered to be implemented in the higher frequency (mmWave) band, e.g., the 60GHz band, in order to accomplish higher data rates. In order to reduce propagation loss of radio waves and increase transmission distance, beamforming, massive Multiple Input Multiple Output (MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming, massive antenna techniques are discussed in the 5G communication system. Further, in the 5G communication system, development of system network improvement is ongoing 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 multipoint (CoMP), reception-side interference cancellation, and the like. In 5G systems, hybrid FSK and QAM modulation (FQAM) and Sliding Window Superposition Coding (SWSC) have also been developed as Advanced Coding Modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and Sparse Code Multiple Access (SCMA) as advanced access techniques.

The internet is a human-centric connected network in which humans produce and consume information, now evolving towards the internet of things (IoT), distributed entities (e.g., things) exchange and process information without human intervention. Internet of everything (IoE), which is a combination of IoT technology and big data processing technology through connection with a cloud server, has emerged. Since technical elements such as "sensing technology", "wired/wireless communication and network architecture", "service interface technology", and "security technology" are required for IoT implementation, sensor networks, machine-to-machine (M2M) communication, Machine Type Communication (MTC), and the like have been recently studied. Such IoT environments 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 networked vehicles, smart grids, health care, smart instruments, and advanced medical services through fusion and integration between existing Information Technology (IT) and various industrial applications.

In response to this, various attempts have been made to apply the 5G communication system to the IoT network. For example, techniques such as sensor networks, Machine Type Communication (MTC), and machine-to-machine (M2M) communication may be implemented through beamforming, MIMO, and array antennas. Applying the cloud Radio Access Network (RAN) as the big data processing technology described above can also be seen as an example of the convergence of 5G technology and IoT technology.

With the progress of the above wireless communication system, various services can be provided, and accordingly, there is a need for a scheme to smoothly provide the services.

The above information is presented merely as background information to aid in understanding the present disclosure. No determination has been made as to whether any of the above is likely to apply to the present disclosure as prior art, nor has any assertion been made.

Disclosure of Invention

Technical problem

In a wireless communication system, particularly in an NR system, a data rate that a terminal can support may be predetermined between a base station and the terminal. This can be calculated by using the maximum frequency band supported by the terminal, the maximum modulation order, the maximum number of layers, and the like. But the base station cannot schedule the terminal with an amount of data corresponding to an instantaneous data rate higher than the calculated data rate. In addition, the scheduling operation of the base station and the data transmission/reception operation of the terminal may vary depending on the manner of calculating the instantaneous data rate.

The NR system can provide not only data communication between a base station and a terminal but also data communication between terminals. In the case of data communication between terminals, it is necessary to determine the data rate that can be supported by the terminals. It is also necessary to define the operation of the terminal after the determined data rate and scheduling information.

Technical scheme

Aspects of the present disclosure are to address at least the above problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present disclosure is to provide an apparatus and method for scheduling and transmitting/receiving data according to the amount of data that a terminal can process or according to a data rate.

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.

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

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: identifying a counterpart of the communication of the terminal as another terminal; obtaining at least one parameter identifying a data rate of the communication; and identifying a data rate based on the at least one parameter and the formula:

advantageous effects

According to the present disclosure, a terminal and a base station may determine a maximum data rate during communication between the terminal and another terminal or during communication between the terminal and the base station, and a device performing scheduling may efficiently transmit/receive data by scheduling data so that the maximum data rate supported by a counterpart terminal is not exceeded.

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.

Drawings

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

fig. 1 illustrates a basic structure of a time-frequency domain, which is a radio resource domain in which data or control channels are transmitted in a downlink or an uplink in an NR system, according to an embodiment of the present disclosure;

fig. 2 illustrates an aspect according to an embodiment of the present disclosure in which a plurality of data for the services eMBB, URLLC, and mtc considered in a 5G or NR system are allocated in frequency-time resources, and fig. 3 illustrates an aspect according to an embodiment of the present disclosure in which a plurality of data for the services eMBB, URLLC, and mtc considered in a 5G or NR system are allocated in frequency-time resources;

fig. 4 illustrates a process of dividing one transport block into a plurality of code blocks and adding CRC thereto according to an embodiment of the present disclosure;

FIG. 5 illustrates a method of using and transmitting an outer code in accordance with an embodiment of the disclosure;

fig. 6A is a block diagram illustrating a structure of a communication system that does not use an outer code according to an embodiment of the present disclosure;

fig. 6B is a block diagram illustrating a structure of a communication system using an outer code according to an embodiment of the present disclosure;

fig. 7 illustrates a method of generating one or more parity 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;

fig. 8A illustrates an example of multicast transmission in a wireless communication system according to an embodiment of the present disclosure;

fig. 8B illustrates 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;

fig. 9 illustrates an example of unicast transmission in a wireless communication system according to an embodiment of the present disclosure;

fig. 10A illustrates an example of side link data transmission according to scheduling of a base station in a wireless communication system according to an embodiment of the present disclosure;

fig. 10B illustrates an example of scheduled sidelink data transmission without a base station in a wireless communication system according to an embodiment of the present disclosure;

fig. 11A illustrates an example of a channel structure of a time slot for sidelink communication in a wireless communication system according to an embodiment of the present disclosure;

fig. 11B is a flowchart illustrating a method of determining whether a terminal performs PDSCH decoding, PUSCH transmission, and pscch reception according to an embodiment of the present disclosure;

fig. 12 is a diagram illustrating an example in which sidelink symbols or channels are mapped to slots and used according to an embodiment of the present disclosure;

fig. 13 illustrates an example of determining a time slot including a specific time in a carrier configured by higher layer signaling in a terminal according to an embodiment of the present disclosure;

fig. 14 illustrates a terminal operation for downlink reception or sidelink transmission/reception according to an embodiment of the present disclosure;

fig. 15 is another diagram illustrating a terminal operation for downlink reception or sidelink transmission/reception according to an embodiment of the present disclosure;

fig. 16 is another diagram illustrating a terminal operation for downlink reception or sidelink transmission/reception according to an embodiment of the present disclosure;

fig. 17 is another diagram illustrating a terminal operation for downlink reception or psch transmission and reception according to an embodiment of the present disclosure;

fig. 18 is another diagram illustrating a terminal operation for downlink reception or psch transmission and reception according to an embodiment of the present disclosure;

fig. 19 is another diagram illustrating the operation of a base station according to an embodiment of the present disclosure;

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

fig. 20B illustrates an embodiment in which a base station determines scheduling resources for a terminal according to an embodiment of the present disclosure;

fig. 21 illustrates an operation of a terminal performing an embodiment of the present disclosure;

fig. 22 is a block diagram of a terminal according to an embodiment of the present disclosure; and

fig. 23 is a block diagram of a base station in accordance with an embodiment of the present disclosure.

Like reference numerals are used to refer to like elements throughout.

Detailed Description

The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. It includes various specific details to aid understanding, but these details are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. Moreover, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are not limited to a reading and writing meaning, but rather, are used by the inventor to enable a clear and consistent understanding of the disclosure. Therefore, it should be apparent to those skilled in the art that the following descriptions of the various embodiments of the present disclosure are provided for illustration only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents.

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 such surfaces.

A new radio access technology (NR) is a new type of 5G communication intended to enable various services to be freely multiplexed in time and frequency resources. Thus, in NR systems, the waveforms, numbers and/or reference signals may be dynamically or freely allocated according to the needs of the respective service. In order to provide the best service to the terminals in wireless communication, data transmission optimization needs to be performed based on measurements of channel quality and interference. Therefore, it is crucial to accurately measure the channel state. In 4G communication systems, channel and interference characteristics do not vary significantly from frequency resource to frequency resource. However, unlike the 4G communication system, in the case of the 5G channel, channel and interference characteristics may vary greatly according to services. Therefore, subset support in the Frequency Resource Group (FRG) dimension may be required in order to measure the channel and interference characteristics of each frequency resource separately. Meanwhile, the types of services supported in the NR system may be classified into enhanced mobile broadband (eMBB), large-scale machine type communication (mtc), and ultra-reliable and low-delay communication (URLLC). The eMBB may be a service for high-speed transmission of large-capacity data. mtc may be a service for minimizing power consumption of a terminal and access of a plurality of terminals. URLLC may be a service for high reliability and low latency. Different requirements may apply depending on the type of service applied to the terminal.

With the research on next-generation communication systems, various methods of scheduling communication with terminals are currently being discussed. Therefore, in consideration of the characteristics of the next-generation communication system, an efficient scheduling and data transmission/reception scheme is desired.

As described above, a plurality of services can be provided to a user in a communication system, and in order to provide a plurality of services to a user, it is desirable to have a method and apparatus for providing respective services in the same time interval.

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

In describing the embodiments of the present disclosure, descriptions related to technical contents which are well known in the art and are not directly related to the present disclosure will be omitted. Such unnecessary description is omitted to prevent the main ideas of the present disclosure from being obscured and to more clearly convey the main ideas.

In the drawings, some elements may be exaggerated, omitted, or schematically illustrated for the same reason. Further, the size of each element does not completely reflect the actual size. In the drawings, the same or corresponding elements are provided with the same reference numerals.

Advantages and features of the present disclosure and methods of accomplishing the same will become apparent by reference to the following detailed description of the embodiments when taken in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments set forth below, but may be embodied in various different forms. The following examples are provided solely for the purpose of fully disclosing the disclosure, and informing those skilled in the art the scope of the disclosure, which is defined solely by the scope of the appended claims. Throughout the specification, the same or similar reference numerals denote the same or similar elements.

It will be understood that each block of the flowchart illustrations, and combinations of blocks in the flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks. These computer program instructions may also be stored in a computer usable or computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer usable or computer-readable memory produce an article of manufacture including instruction means that implement the function specified in the flowchart block or blocks. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operations to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide operations for implementing the functions specified in the flowchart block or blocks.

Furthermore, each block of the flowchart illustrations may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.

As used herein, "unit" refers to a software element or a hardware element, such as a Field Programmable Gate Array (FPGA) or Application Specific Integrated Circuit (ASIC), which performs a predetermined function. However, the "unit" does not always have a meaning limited to only software or hardware. The "unit" may be configured to be stored in an addressable storage medium or configured to execute one or more processors. Thus, a "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and parameters. The elements and functions provided by a "unit" may be combined into a smaller number of elements or "units" or divided into a larger number of elements or "units". Furthermore, these elements and "units" may alternatively be implemented as one or more CPUs replicated within one device or secure multimedia card. Further, a "unit" in the present embodiment may include one or more processors.

The wireless communication system has been developed as a broadband wireless communication system providing high-speed and high-quality packet data services, which departs from the early stage of providing only voice services, such as 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, and the like. Further, in the fifth generation wireless communication system, a communication standard of 5G or New Radio (NR) has been established.

The NR system is a representative example of a broadband wireless communication system, and an Orthogonal Frequency Division Multiplexing (OFDM) scheme is employed in Downlink (DL) and uplink. More specifically, the downlink employs a cyclic prefix OFDM (CP-OFDM) scheme; the uplink employs two schemes including a CP-OFDM scheme and a discrete fourier transform spread OFDM (DFT-S-OFDM) scheme. The uplink refers to a radio link through which a terminal (user equipment (UE)) or a Mobile Station (MS) transmits data or control signals to a base station (BS or enode B). The downlink refers to a radio link through which a base station transmits data or control signals to a terminal. In the multiple access scheme as described above, time-frequency resources on which data or control information to be transmitted to each user is generally allocated and managed to satisfy orthogonality, i.e., not to overlap with each other, so that data or control information of each user is distinguished.

The NR system employs a hybrid automatic repeat request (HARQ) scheme, and if decoding fails at the initial transmission, corresponding data is retransmitted at a physical layer. In the HARQ scheme, if a receiver fails to accurately decode data, the receiver transmits information (negative acknowledgement (NACK)) notifying a decoding failure to a transmitter to allow the transmitter to retransmit corresponding data in a physical layer. The receiver combines the data retransmitted by the transmitter with the data that failed to be decoded previously to improve data reception performance. Further, if the receiver accurately decodes the data, the receiver may send information (acknowledgement (ACK)) notifying the transmitter of the decoding success to allow the transmitter to send new data.

Fig. 1 illustrates a basic structure of a time-frequency domain, which is a radio resource domain in which data or control channels are transmitted in a downlink or an uplink in an NR system, according to an embodiment of the present disclosure.

Referring to fig. 1, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain is an OFDM symbol, N_symbThe OFDM symbols 102 are grouped together to configure a slot 106. The length of the subframe is defined as 1.0 ms and the radio frame 114 is defined as 10 ms. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the transmission band of the whole system is composed of the total

Or

The subcarriers 104 are configured.

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. Resource Blocks (RBs) 108 (or Physical Resource Blocks (PRBs)) are defined by N in the time domain_symbA number of consecutive OFDM symbols 102 and N in the frequency domain_RBA number of consecutive subcarriers 110. Thus, one RB 108 is composed of N_symb×N_RBAnd configuring the RE. Generally, the minimum transmission unit of data is one RB unit. In the NR system, N_symb＝14，N_RB＝12，

Proportional to the bandwidth of the system transmission band. In addition, the data rate may be increased in proportion to the number of RBs scheduled for the terminal。

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

[ Table 1]

The NR system may operate at a wider channel bandwidth than that of LTE set forth in table 1.

The bandwidth of the NR system may be configured as shown in tables 2 and 3. Table 2 describes the bandwidth configuration of frequency range 1(FR1), and table 3 describes the bandwidth configuration of frequency range 2(FR 2).

[ Table 2]

[ Table 3]

In the NR system, the frequency range may be divided and defined as FR1 and FR 2. For example, FR1 represents 450MHz to 7125MHz, and FR2 represents 24250Mhz to 52600 MHz.

In the above, the ranges of FR1 and FR2 may be variously changed and applied. For example, the frequency range of FR1 can be varied from 450MHz to 7125MHz and applied.

In the NR system, scheduling information of downlink data or uplink data may be transmitted from a base station to a terminal through Downlink Control Information (DCI). The DCI is defined according to various formats, and the DCI may indicate whether it is scheduling information of uplink data (UL grant) or scheduling information of 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) of downlink data, and may include at least one of the following control information.

-carrier indicator: indicating the carrier frequency at which the transmission is made.

-DCI format indicator: the DCI format indicator indicates whether a corresponding DCI is for downlink or uplink.

-a bandwidth part (BWP) indicator: indicating BWP for transmission.

-frequency domain resource allocation: denotes RBs of a frequency domain, which are allocated for data transmission. The resources are determined according to the system bandwidth and the resource allocation scheme.

-time domain resource allocation: an OFDM symbol representing a slot in which a channel related to data is to be transmitted and the slot.

-VRB-PRB mapping: a mapping scheme is shown by which a virtual rb (vrb) index is mapped to a physical rb (prb) index.

Modulation and Coding Scheme (MCS): indicating the code rate and modulation scheme used for data transmission. That is, the MCS may represent a coding rate value capable of representing a Transport Block Size (TBS) and channel coding information, as well as information related to QPSK, 16QAM, 64QAM, and 256 QAM.

-Code Block Group (CBG) transport information: indicating information on the transmitted CBG when retransmission in CBG units is configured.

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

-new data indicator: indicating whether the HARQ transmission is an initial transmission or a retransmission.

-redundancy version: indicating the redundancy version of HARQ.

-Transmit Power Control (TPC) commands of the Physical Uplink Control Channel (PUCCH): denotes a TPC command of PUCCH which is an uplink control channel.

In case of PUSCH transmission, time domain resource allocation may be performed according to information on a slot in which a PUSCH is transmitted, a starting symbol position S in a corresponding slot, and the number of symbols L to which the PUSCH is mapped. In the above, S may be a relative position from the start of a slot, L may be a number of consecutive symbols, and S and L may be determined according to a Start and Length Indication Value (SLIV) defined as follows.

In general, in the NR system, a terminal may receive a configuration table in which an SLIV value, a PDSCH or PUSCH mapping type, and information (e.g., in the form of a table) on a slot in which a PDSCH or PUSCH is transmitted are included in one row through RRC configuration. Thereafter, for time domain resource allocation of DCI, the base station may transmit the SLIV value, the PDSCH or PUSCH mapping type, and information on a slot in which the PDSCH or PUSCH is transmitted to the terminal by indicating an index value in the table configured as above.

In the NR system, the PUSCH mapping type is defined by type a and type B. In PUSCH mapping type a, a first symbol of DMRS symbols is located at a second or third OFDM symbol in a slot. In PUSCH mapping type B, a first symbol of DMRS symbols is located at a first OFDM symbol in time domain resources allocated via PUSCH transmission.

In the NR system, a PDSCH mapping type is defined by type a and type B, and a first symbol of DMRS symbols may be located in a first symbol of the PDSCH.

Tables 4 and 5 represent combinations of S and L, respectively, which are supported for each type of PDSCH and PUSCH.

[ Table 4]

[ Table 5]

The DCI may be subjected to a channel coding and modulation process and then may be transmitted through a Physical Downlink Control Channel (PDCCH) (or "control information", hereinafter, used interchangeably) which is a downlink physical control channel.

In general, DCI is scrambled with a specific Radio Network Temporary Identifier (RNTI) (or terminal identifier), each terminal is independently scrambled, a cyclic redundancy identity (CRC) is added thereto, and channel coding is performed, whereby each independent PDCCH is configured and transmitted. The PDCCH is mapped and transmitted in a control resource set (CORESET) configured for the terminal.

The downlink data may be transmitted through a Physical Downlink Shared Channel (PDSCH) which is a physical channel for downlink data transmission. The PDSCH may be transmitted after a control channel transmission interval, and in the frequency domain, scheduling information (e.g., a specific mapping location and modulation scheme) may be determined based on DCI transmitted through the PDCCH.

Through the MCS included in the control information in the DCI, the base station can inform the terminal of a modulation scheme applied to the PDSCH to be transmitted and the size of data to be transmitted (transport block size (TBS)). In embodiments, the MCS may be configured by 5 bits or more or less. Before applying channel coding for error correction to data, the TBS corresponds to the size of data (transport block, TB) that the base station desires to transmit.

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, the TB may represent a data unit from the MAC layer to the physical layer, or a MAC protocol data unit (MAC PDU).

The modulation scheme supported by the NR system is quadrature phase shift keying(QPSK), 16 quadrature amplitude modulation (16QAM), 64QAM, and 256 QAM. Modulation order (Q) of QPSK, 16QAM, 64QAM and 256QAM_m) Corresponding 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.

Fig. 2 illustrates an aspect according to an embodiment of the present disclosure in which a plurality of data for the services eMBB, URLLC, and mtc considered in a 5G or NR system are allocated in frequency-time resources, and fig. 3 illustrates an aspect according to an embodiment of the present disclosure in which a plurality of data for the services eMBB, URLLC, and mtc considered in a 5G or NR system are allocated in frequency-time resources.

Referring to fig. 2 and 3, a scheme in which frequency and time resources are allocated for performing information transmission in each system may be proposed.

First, fig. 2 illustrates an aspect in which a plurality of data of eMBB, URLLC, and mtc are distributed into a frequency bandwidth 200 of the entire system. In the process of allocating and transmitting the eMBB data 201 and the mtc data 209 in a specific frequency bandwidth, if

URLLC data

203, 205, and 207 occur and thus need to be transmitted, the base station or the terminal may transmit the

URLLC data

203, 205, and 207 without clearing or transmitting a portion in which the eMBB data 201 and the mtc data 209 have been allocated. Since URLLC needs to reduce delay time in service,

URLLC data

203, 205, and 207 can be allocated to a part of the resources allocated with the eMBB data 201, and thus can be transmitted. Of course, in the case where the

URLLC data

203, 205, and 207 are additionally allocated and transmitted in the resource to which the eMBB data 201 is allocated, the eMBB data may not be transmitted in the overlapping frequency-time resources, and thus the transmission performance of the eMBB data may be degraded. That is, in the above case, an eMBB data transmission failure due to URLLC allocation may occur.

In fig. 3, an overall system frequency bandwidth 300 may be divided into

sub-bands

302, 304, and 306 and used to transmit services and data therein. Information associated with the subband configuration may be predetermined and may be transmitted by the base station to the terminal through higher layer signaling. Alternatively, information associated with a sub-band may be arbitrarily divided by a base station or a network node and serve a terminal without transmitting separate sub-band configuration information. Fig. 3 shows that sub-band 302 is used to transmit eMBB data 308, sub-band 304 is used to transmit

URLLC data

310, 312, and 314, and sub-band 306 is used to transmit mtc data 316.

In an entire embodiment, a length of a Transmission Time Interval (TTI) for URLLC transmission may be shorter than a length of a TTI for transmitting eMBB data or mtc data. Further, the response of information related to URLLC may be faster than the transmission of information of eMBB or mtc, and thus the transmission or reception of information may be performed with low delay. The structures of physical layer channels for transmitting three services or data may be different from each other. For example, at least one of a length of a Transmission Time Interval (TTI), an allocation unit of frequency resources, a structure of a control channel, and a data mapping method may be different.

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

For the purpose of explaining the method and apparatus proposed in the present embodiment, the terms "physical channel" and "signal" may be used in relation to the NR system. However, the details of the present disclosure may be applied to wireless communication systems other than the NR system.

Fig. 4 illustrates a process of dividing one transport block into a plurality of code blocks and adding CRC thereto according to an embodiment of the present disclosure.

Referring to fig. 4, a CRC 403 may be added to a last part or a first part of one Transport Block (TB)401 to be transmitted in uplink or downlink. The CRC 403 may have 16 bits, 24 bits, or a predetermined fixed number of bits, or a variable number of bits according to channel conditions, and may be used to determine whether the channel coding is successful. The TB 401 and the CRC 403-added block may be divided into a plurality of Code Blocks (CBs) 407, 409, 411, and 413 (denoted by reference numeral 405). The divided code blocks 407, 409, 411, and 413 may have a predetermined maximum size, in which case the size of the last code block 413 may be smaller than the sizes of the other code blocks 407, 409, and 411. However, this is only one example, and according to another example, the length of the last code block 413 may be adjusted to be the same as the lengths of the other code blocks 407, 409, and 411 by inserting a zero, a random value, or 1 to the last code block 413.

CRCs

417, 419, 421, and 423 may be added to the divided code blocks, respectively (denoted by reference numeral 415). The CRC may include 16 bits, 24 bits, or a predetermined fixed number of bits and may be used to determine whether the channel coding was successful.

TB 401 and a loop generator polynomial may be used to generate CRC 403, which may be defined in various ways. For example, if the cycle generator polynomial gccrc 24A (D) is assumed to be [ D24+ D23+ D18+ D17+ D14+ D11+ D10+ D7+ D6+ D5+ D4+ D3+ D +1]Is a 24-bit CRC, and L is 24, for TB data a₀，a₁，a₂，a₃，....，a_A-1，CRC p₀，p₁，p₂，p₃，....，p_L-1Can determine a₀D^A+23+a₁D^A+22+…+a_A-1D²⁴+p₀D²³+p₁D²²+…+p₂₂D¹+p₂₃To be p₀，p₁，p₂，p₃，....，p_L-1The remainder becomes a value of zero after division by gccrc 24A (D). In the above example, it is assumed that the CRC length "L" is 24 as an example, but the CRC length "L" may be determined to have different lengths, for example, 12, 16, 24, 32, 40, 48, 64, etc.

Through this process, CRC 403 is added to TB 401, wherein the TB with CRC added thereto may be divided into

N CBs

407, 409, 411, and 413.

CRCs

417, 419, 421, and 423 may be added to each of the divided

CBs

407, 409, 411, and 413 (denoted by reference numeral 415). The length of

CRCs

417, 419, 421 and 423 added to

CBs

407, 409, 411 and 413 may be different from the length of CRC 403 added to TB 401, or different loop generator polynomials may be used. However, the CRC 403 added to the TB 401 and the

CRCs

417, 419, 421, and 423 added to the code blocks 407, 409, 411, and 413 may be omitted depending on the type of channel code to be applied to the code blocks. For example, if an LDPC code other than the turbo code is applied to the code blocks, the

CRCs

417, 419, 421, and 423 to be inserted for each code block may be omitted.

However, even if LDPC is applied,

CRCs

417, 419, 421, and 423 may be added to a code block as they are. Further, even if a polar code is employed, CRC may be added or omitted.

As described above in fig. 4, 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 the CRC added to the TB are divided into a plurality of code blocks according to the maximum length of the code blocks.

In the conventional LTE system, CRCs of CBs are added to the divided CBs, the data bits and the CRCs of CBs are coded with channel coding to determine coded bits, and the number of bits to be predetermined rate-matched for each coded bit can be determined.

Fig. 5 illustrates a method of transmitting using an outer code according to an embodiment. Fig. 6A is a block diagram showing a structure of a communication system not using an outer code according to an embodiment, and fig. 6B is a block diagram showing a structure of a communication system using an outer code according to an embodiment.

Referring to fig. 5, 6A, and 6B, a method of transmitting a signal using an outer code may be described.

In fig. 5, a transport block is divided into code blocks, and bits or symbols 504 at the same positions in each code block are encoded using a second channel code to generate parity bits or symbols 506 (denoted by reference numeral 502). Thereafter, CRCs may be added to each code block and parity code block (denoted by reference numerals 508 and 510) generated by the second channel code encoding, respectively.

Whether to add CRC may be decided according to the type of channel code. For example, if a turbo code is used as the first channel code,

CRCs

508 and 510 are added. Thereafter, the respective code blocks and the parity code blocks may be encoded by the first channel code. In the present disclosure, a convolutional code, an LDPC code, a Turbo code, a polar coordinate code, or the like may be used as the first channel code. However, this is merely an example, and various channel codes as the first channel code may be applied to the present disclosure. In the present disclosure, as the second channel code, for example, a reed-solomon code, BCH code, Raptor code, parity generating code, or the like can be used. However, this is merely an example, and various channel codes may be applied to the present disclosure as the second channel code.

Referring to reference numeral 600 in fig. 6A, if an outer code is not used, a first channel coding encoder 601 and a first channel coding decoder 605 are used in a transceiver, respectively, and a second channel coding encoder and a second channel coding decoder may not be used. Even if the outer code is not used, the first channel encoder 601 and the first channel codec 605 may be configured in the same manner as the case of using the outer code to be described later.

Referring to reference numeral 650 in fig. 6B, if an outer code is used, data to be transmitted may pass through the second channel coding encoder 609. The bits or symbols passed through the second channel coding encoder 609 may pass through the first channel coding encoder 611. If the channel-coded symbols pass through the channel 613 and are received by the receiver, the receiver may operate the first channel codec 615 and the second channel codec 617 in turn based on the received signals. The first channel codec 615 and the second channel codec 617 may perform operations corresponding to the first channel codec 611 and the second channel codec 609, respectively.

Fig. 7 illustrates a method of generating one or more parity 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.

As described above in fig. 4, one transport block may be divided into one or more code blocks. Here, if only one code block is generated according to the size of the transport block, the CRC may not be added on the corresponding code block. Parity code blocks 740 and 742 (denoted by reference numeral 724) may be generated if an outer code is applied to the code block to be transmitted. If an outer code is used, parity code blocks 740 and 742 may be located after the last code block (denoted by reference numeral 724). After the outer code,

CRCs

726, 728, 730, 732, 734, and 736 (represented by reference numeral 738) may be added. Thereafter, the respective code blocks and parity code blocks may be encoded with a channel code together with the CRC.

The size of the TB (i.e., TBs) in an NR system can be calculated by the following operations.

Operation 1: n'_REI.e. the number of REs allocated to PDSCH mapping in one PRB of the allocated resources is calculated.

Where N is_RE'Can pass through

And (4) calculating. Here, the

Is a number of 12, and the number of,

may represent the number of OFDM symbols allocated to the PDSCH.

DMRSs that are the same CDM group occupy the number of REs in one PRB.

Is the number of REs occupied by overhead in one PRB, which is configured through higher layer signaling, and may be configured as one of 0, 6, 12, 18. Thereafter, N may be calculated_REI.e., the total number of REs allocated to the PDSCH. N is a radical of_REIs through min (156, N)_RE′)·n_PRBCalculated as N_PRBIndicating the number of PRBs allocated to the terminal.

Operation 2: number N of temporary information bits_infoCan pass through N_RE*R*Q_mV calculation. Where R is the code rate, Q_mIs the modulation order, this value of information can be transmitted using a predefined table in the MCS bit field and control information. In addition, v is the number of layers allocated. In N_infoIn the case of 3824 or less, TBS may be measured by the following procedure 3And (4) calculating. Otherwise, TBS may be calculated through operation 4.

Operation 3: can be represented by formula

And

calculating N'_info. TBS may be determined as the value closest to N 'or more of the values of Table 6 below'_infoN'_info。

[ Table 6]

Index (I)	TBS	Index (I)	TBS	Index (I)	TBS	Index (I)	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

And operation 4: can be represented by formula

And

calculating N'_info. TBS may be through N'_infoValue of (c) and the following [ pseudo code 1]]The TBS is determined.

[ Start pseudo code 1]

IfR≤1/4

eles

If N′_info＞8424

where

else

End if

[ end pseudo code 1]

In the NR system, if one 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 pattern. A method of transmitting all parity bits generated by LDPC coding for a specific input may be referred to as Full Buffer Rate Matching (FBRM), and a method of limiting the number of parity bits that can be transmitted may be referred to as Limited Buffer Rate Matching (LBRM).

If it isWhen resources are allocated for data transmission, the output of the LDPC encoder is completed using a circular buffer, the number of times bits of the buffer are retransmitted is the same as the number of allocated resources, and the length of the circular buffer can be referred to as N_cb. If the number of parity bits generated by LDPC encoding is N, then N_cbEqual to N in the FRRM method. In the LBRM method, N_cbRepresents min (N, N)_ref)，N_refBy

Given that R_LBRMMay be determined as 2/3. In the above method for obtaining TBS, TBS_LBRMIndicating the maximum number of layers supported by the terminal in the corresponding cell. Further, to obtain TBS_LBRMAssuming TBS if the maximum modulation order is not configured for the corresponding terminal_LBRMFor 64QAM, the coding rate is assumed to be 948/1024, i.e., the maximum code rate N_REAssume N_REIs 156. n_PRB，n_PRBCan be assumed to be n_PRB，LBRMWherein n is_PRB，LBRMThis can be given as shown in table 7 below.

[ Table 7]

Maximum number of PRBs in DL BWP and UL BWP for all configurations of a carrier	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

The maximum data rate supported by the terminal in the NR system can be determined by the following equation 1.

[ equation 1]

In equation 1, J may represent the number of carriers, R, constrained by carrier aggregation_max948/1024 may

The maximum number of layers is indicated,

can represent the maximum modulation order, f^(j)A scale factor may be represented and μmay represent a subcarrier spacing. The terminal can be connected with^(j)Reported as one of 1, 0.8, 0.75 and 0.4, μ can be given as shown in table 8 below.

[ Table 8]

μ	Δf＝2^μ·15[kHz]	Cyclic prefix
			0	15	Is normal
1	30	Is normal
			2	60	Normal, extended
3	120	Is normal
			4	240	Is normal

In addition, the method can be used for producing a composite material

Is the average OFDM symbol length and is,

can be calculated as

And is that

Is the maximum number of RBs in BW (j). OH group^(j)Is the value of the overhead that is,at OH^(j)It may be given 0.14 in the downlink of FR1 (frequency band equal to or less than 6 GHz), 0.18 in its uplink, 0.08 in the downlink of FR2 (frequency band higher than 6 GHz), and 0.10 in its uplink. With equation 1, the maximum data rate of the downlink in a cell having a frequency bandwidth of 100MHz and a subcarrier spacing of 30kHz can be calculated by the following table 9.

[ Table 9]

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

[ Table 10]

The maximum data rate supported by the terminal may be determined by table 9, and the actual data rate according to the allocated TBS may be determined by table 10. At this time, the actual data rate may be greater than the maximum data rate, depending on the scheduling information.

In a wireless communication system, particularly an NR system, a data rate supportable by a terminal may be promised between a base station and the terminal. The data rate may be calculated using the maximum frequency band, the maximum modulation order, and the maximum number of layers supported by the terminal. However, the calculated data rate may be different from a value calculated from a Transport Block Size (TBS) used for actual data transmission and a TTI length of a Transport Block (TB).

Therefore, there may be a case where the TBS allocated to the terminal is greater than a value corresponding to a data rate supported by the terminal itself. It may be desirable to minimize the occurrence of this situation and define the operation of the terminal in the above-described situation. The following embodiments provide a method and apparatus for solving a case where a maximum data rate supportable by a terminal and an actual data rate according to scheduling do not match. In the above, the maximum data rate may be a value determined based on the capability or the terminal capability, and the actual data rate may be a value determined based on the scheduling information when data transmission is performed.

In the embodiments described below, the base station is a subject that performs resource allocation to the terminal, and may be a base station that supports both V2X communication and general cellular communication, or a base station that supports only V2X communication. That is, the base station may represent a new generation node b (gnb), evolved node b (enb), or Road Site Unit (RSU), Base Station (BS), radio access unit, base station controller, or fixed station. The terminal may be one of: a vehicle supporting vehicle-to-vehicle communication (V2V), a vehicle supporting vehicle-to-vehicle communication (V2P), a cell phone (e.g., a smart phone) of a pedestrian, 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 a partial base station function and a partial terminal function, and general UEs and mobile stations.

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

Hereinafter, in the present disclosure, higher layer signaling is a signaling manner, which is a manner of transmitting a signal by a base station to a terminal by using a downlink data channel of a physical layer or transmitting a signal by a terminal to a base station by using an uplink data channel of a physical layer, and may be referred to as RRC signaling or MAC Control Element (CE).

In the present disclosure, peak data rate, maximum data rate, highest data rate, and the like may be used interchangeably.

In the V2X environment, data may be transmitted from one terminal to a plurality of terminals, or data may be transmitted from one terminal to one terminal. Alternatively, data may be transmitted from a base station to multiple terminals. However, the present disclosure is not limited thereto, and may be applied to various cases.

For transmission or reception by a terminal over a Side Link (SL) (SL refers to a radio path for signals transmitted by the terminal to at least one other terminal), the terminal operates based on a previously defined, configured, or pre-configured pool of resources between terminals. The resource pool may be a set of frequency and time domain resources that may be used to transmit or receive sidelink signals. That is, in order to transmit or receive a sidelink signal, the transmission or reception of the sidelink signal needs to be performed in a predetermined frequency-time resource, which is defined as a resource pool. The resource pool may be defined for transmission and reception, and may be universally defined and used for transmission and reception. In addition, the terminal may receive the configuration of one or more resource pools and may perform a sidelink signaling/receiving operation.

The configuration information related to the resource pool for sidelink transmission and reception and other configuration information for sidelink may be pre-installed at the time of manufacture of the terminal, may be configured by the current base station, may be pre-configured by another base station or another network element before accessing the current base station, may be a fixed value, may be provided from the network, or may be self-established by the terminal.

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 side link shared channel (PSCCH). In addition, a broadcast channel broadcasted together with the synchronization signal may be referred to as a Physical Sidelink Broadcast Channel (PSBCH), and a channel for feedback transmission may be referred to as a Physical Sidelink Feedback Channel (PSFCH). However, PSCCH or pscsch may be used for feedback transmission. The above channels may be referred to as LTE-PSCCH, NR-PSCCH, etc., depending on the communication system. 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.

The information transmitted through the sidelink may include Sidelink Control Information (SCI), Sidelink Feedback Control Information (SFCI), Sidelink Channel Status Information (SCSI), and a sidelink shared channel (SL-SCH) as a transmission channel.

The above-described information and transport channels can be mapped to physical channels as shown in tables 11 and 12 below.

[ Table 11]

TrCH (transport channel)	Physical channel
		SL-SCH	PSSCH

[ Table 12]

Control information	Physical channel
		SCI	PSCCH
SFCI	PSFCH
		SCSI	PSSCH

Alternatively, if SCSI is sent over PSFCH, the transmit channel-to-physical channel mapping shown in tables 13 and 14 may be applied.

[ Table 13]

TrCH (transport channel)	Physical channel
		SL-SCH	PSSCH

[ Table 14]

Control information	Physical channel
		SCI	PSCCH
SFCI	PSFCH
		SCSI	PSFCH

Alternatively, when SCSI is sent to higher layers and sent using, for example, MAC CE, SCSI can be sent over PSSCH because higher layer signaling corresponds to SL-SCH. Next, the transmission channel-physical channel mapping shown in tables 15 and 16 can be applied thereto.

[ Table 15]

TrCH (transport channel)	Physical channel
		SL-SCH	PSSCH

[ Table 16]

Control information	Physical channel
		SCI	PSCCH
SFCI	PSFCH

Fig. 8A illustrates an example of multicast transmission in a wireless communication system according to an embodiment of the present disclosure.

Referring to fig. 8A, a terminal 820 transmits common data to a plurality of

terminals

821a, 821b, 821c, and 821d, that is, transmits data in a multicast manner. Terminal 820 and

terminals

821a, 821b, 821c, and 821d may be mobile devices, such as automobiles. For multicast, at least one of separate control information (e.g., SCI), physical control channel (e.g., PSCCH), and data may be transmitted.

Fig. 8B illustrates an example of HARQ feedback transmission according to multicast in a wireless communication system according to an embodiment of the present disclosure.

Referring to fig. 8B,

terminals

821a, 821B, 821c, and 821d, which have received common data by multicast, transmit information indicating success or failure of data reception to terminal 820, which has transmitted the data. The information indicating success or failure of data reception may include HARQ-ACK feedback. The data transmission and feedback operations shown in fig. 8A and 8B have been performed based on multicast. However, according to another embodiment, the data transmission and feedback operations as shown in fig. 8A and 8B may be applied to unicast transmission.

Fig. 9 illustrates an example of unicast transmission in a wireless communication system according to an embodiment of the present disclosure.

Referring to fig. 9, a first terminal 920a transmits data to a second terminal 920 b. As another example, the direction of data transmission may be reversed (i.e., data may be transmitted from the second terminal 920b to the first terminal 920 a). The

terminals

920c and 920d other than the first terminal 920a and the second terminal 920b may not receive data transmitted or received through the unicast scheme between the first terminal 920a and the second terminal 920 b. Data transmission or reception through unicast communication between the first terminal 920a and the second terminal 920b may be performed by mapping in committed resources between the first terminal 920a and the second terminal 920b, may be performed by a process of scrambling using a 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 promised 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 unique IDs. The terminal may be a mobile terminal, such as a vehicle. For unicast communication, at least one of separate control information, physical control channel, and data may be transmitted.

Fig. 10A illustrates an example of scheduled sidelink data transmission by a base station in a wireless communication system according to an embodiment of the present disclosure.

Fig. 10A shows a "mode 1" method, which is a method of transmitting side link data by a terminal that has received scheduling information from a base station. In the present disclosure, a method for performing a sidelink communication based on scheduling information is referred to as "mode 1", but may be referred to differently therefrom. Referring to fig. 10A, a terminal 1020A (hereinafter, referred to as a "transmitting terminal") that wants to perform transmission through a sidelink receives scheduling information for sidelink communication from a base station 1010. Upon 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. Scheduling information for sidelink communication received from the base station is included in the DCI, and the DCI may include at least one of the items as shown in table 17 below.

[ Table 17]

Scheduling may be performed for one-time sidelink transmission, as well as for periodic transmission, semi-persistent scheduling (SPS), or grant of transmission configuration. The scheduling method may be distinguished by an index included in the DCI, RNTI scrambling of CRC added to the DCI, or an ID value. The DCI for side-link transmission may further include padding bits (e.g., 0 bits) such that the size of the DCI is the same as the size of another DCI format, e.g., a DCI for downlink scheduling or uplink scheduling.

The transmitting terminal 1020a receives DCI for side link scheduling from the base station 1010, transmits a PSCCH including side link scheduling information to the receiving terminal 1020b, and then transmits a PSCCH of data corresponding to the PSCCH. SCI is side link scheduling information transmitted by the terminal over PSCCH and may include at least one of the items shown in table 18 below.

[ Table 18]

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. A transmission method performed in a split manner by two SCIs may be referred to as a two-stage SCI method.

Fig. 10B illustrates an example of scheduled sidelink data transmission without a base station in a wireless communication system according to an embodiment of the present disclosure.

Referring to fig. 10B, it shows an example of a "mode 2" method, which is a method of transmitting sidelink data by a terminal without receiving scheduling information of a base station. In the present disclosure, a method of performing sidelink communications without receiving scheduling information is referred to as mode 2, but may be referred to differently therefrom. The transmitting terminal 1020a that wants to transmit data via the sidelink can transmit the sidelink scheduling information and the sidelink data to the receiving terminal 1020b according to the determination of the transmitting terminal itself without receiving the scheduling of the base station. Here, the sidelink scheduling control information may include SCI in the same format as SCI used in the mode 1 sidelink communication. For example, the scheduling control information may include at least one entry shown in table 18.

Fig. 11A illustrates an example of a channel structure of a time slot for sidelink communication according to an embodiment of the present disclosure. Fig. 11A shows an example of physical channels mapped to slots for sidelink communications. Referring to fig. 11A, a preamble 1101 is mapped to a position before the start of a slot, i.e., the rear end of the previous slot. Thereafter, from the beginning of the slot, PSCCH 1102, psch 1103, GAP 1104, Physical Sidelink Feedback Channel (PSFCH)1105, and GAP 1106 are mapped.

The transmitting terminal transmits a preamble signal 1101 in one or more symbols before transmitting a signal in a corresponding slot. The preamble may be used for a receiving terminal to correctly perform Automatic Gain Control (AGC) in order to adjust the strength of amplification when the receiving terminal amplifies the power of a received signal. In addition, the preamble may be transmitted or not transmitted according to whether the transmitting terminal performs transmission of the previous slot. That is, when a transmitting terminal transmits a signal to the same terminal in a slot (e.g., slot # n-1) previous to a corresponding slot (e.g., slot # n), the transmission of the preamble 1101 may be omitted. The preamble 1101 may be referred to as a "sync signal", "sidelink reference signal", "intermediate signal", "initial signal", "wake-up signal", or other terms having technical equivalents thereof.

The PSCCH 1102 including control information is transmitted using symbols transmitted at the start of a slot, and the PSCCH 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 PSCCH 1102. Thereafter, the GAP 1104 exists and the PSFCH 1105 (i.e., the physical channel for transmitting the feedback information) is mapped thereto.

The terminal may receive a pre-configuration of the location of the time slot in which the PSFCH can be transmitted. The description on receiving the preconfiguration may indicate that the preconfiguration is predetermined in a terminal manufacturing process, the preconfiguration is transmitted when accessing a side link correlation system, the preconfiguration is transmitted from a base station when accessing the base station, or the preconfiguration is transmitted from another terminal.

Referring to fig. 11A, the PSFCH 1105 is shown as being located in the last portion of the slot. By fixing the GAP 1104 between the psch 1103 and the PSFCH 1105, i.e., a portion that is empty for a predetermined time, a terminal that has transmitted or received the psch 1103 can prepare to receive or transmit the PSFCH 1105 (e.g., transmit/receive conversion). After the PSFCH 1105, there is a GAP 1106 that is empty for a predetermined time.

A terminal that wants to transmit data in the sidelink resource pool first performs an operation of searching sidelink resources to determine resources for data transmission. This may be referred to as channel sensing, which may be an operation of searching resources in advance for initial transmission and retransmission of specific data, Transport Blocks (TBs), or Code Blocks (CBs). In this channel sensing process, resources found for initial transmission and retransmission may have different sizes of resources in the frequency domain. That is, only 1 subchannel or 10 PRBs may be used for initial transmission, and 4 subchannels or 40 PRBs may be used for retransmission.

Here, the TB transmitted through 1 subchannel at the initial transmission may have the same size as the TB transmitted at the retransmission. Therefore, the terminal may need a method of appropriately determining a TB Size (TBs). The terminal for transmitting the control information and data and the terminal for receiving the control information and data may determine the size of the TB for transmission or reception by using a combination of one or more of the following methods.

The TBS determination method for side-link data transmission can be summarized as follows.

[ Table 19]

Index (I)	TBS	Index (I)	TBS	Index (I)	TBS	Index (I)	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

[ Table 20]

In the method of determining TBS in side link data transmission/reception, a value less than 156, e.g., 144, may be used instead of formula N_RE＝min(156,N′_AE).n_PRB1560 in

Alternatively, TBS may be formulated by

It is determined that N 'may not be used in this process'_RE. In the above case, the number of OFDM symbols allocated to PSSCH

May be determined according to at least one of the following methods.

Method a-1:

is the number of symbols to which the psch is mapped in the slot in which it is transmitted.

Method a-2:

is determined as the maximum of the number of symbols available for side link PSSCH transmission in a slot configured in the resource pool in which the PSSCH is transmitted. For example, if one PSFCH is configured every two slots in the corresponding resource pool, the determination is made based on the slots where the PSFCH does not exist

Method a-3:

is determined as the minimum of the number of symbols available for side link PSSCH transmission in a slot configured in the resource pool in which the PSSCH is transmitted. For example, if one PSFCH is configured every two slots in the corresponding resource pool, the determination is made based on the slots in which the PSFCH exists

Method a-4:

is determined as the average of the number of symbols available for sidelink PSSCH transmission in a slot configured in the resource pool in which the PSSCH is transmitted. For example, if one PSFCH is configured every two slots in the corresponding resource pool, it is determined

Is the average of the number of symbols available for the psch in slots where PSFCH is present and slots where PSFCH is not present.

Method a-5:

has a value determined by an average upper bound of the number of symbols available for sidelink PSSCH transmission in the slot configured for PSSCH transmission in the resource pool.

Method a-6:

has a value determined by the lower bound of the average of the number of symbols available for sidelink PSSCH transmission in the slot configured for PSSCH transmission in the resource pool.

Method a-7:

with round-off (rounding) determination by the average of the number of symbols available for side link PSSCH transmission in a slot configured to transmit PSSCH in a resource poolThe value of (c).

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 (1). In addition, symbols defined as gap symbols are not included in

In (1). However, since the above is merely an example, embodiments of the present disclosure are not limited thereto even when the first symbol of the sidelink is included in

In the middle, the determined number of OFDM symbols can also be used

The method of (1). Further, even in the case of including a symbol defined as a gap symbol, these methods can be used.

Further, when the determination is made

May include the mapped symbol of the 2 nd SCI, etc., and, in addition, when determined

The number of OFDM symbols allocated to the PSFCH may be excluded. In addition to this, the present invention is,

indicating the number of REs occupied by overhead in one PRB configured through higher layer signaling. This value may be a (pre-) configured value in the resource pool. For can be preconfigured to

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 be due to consideration of the 2 nd SCIWhat happens is that. For example,

may be configured as a value of 0, 6, 12, 18, 24, 30, 36, 42, etc., or one of 0, 6, 12, 18, 36, 60, 84, or 108, etc.

[ first embodiment ]

According to an embodiment, the maximum data rate supported by a terminal may differ according to the counterpart communicating with the terminal. That is, the maximum data rate supported by the terminal may be different according to whether the terminal transmits or receives data to the base station or another terminal. The maximum data rate supported by the terminal may be determined by equation 1, and at least one parameter in equation 1 may have a different value according to a communication counterpart of the terminal. That is, the maximum data rate may be different depending on whether the terminal performs downlink and uplink transmission/reception operations or a sidelink transmission/reception operation.

For example, when a terminal transmits or receives data to or from a base station, OH^(j)Is the overhead value, OH^(j)It can be given 0.14 in the downlink of FR1 (frequency band equal to or less than 6 GHz), 0.18 in its uplink, 0.08 in the downlink of FR2 (frequency band higher than 6 GHz), and 0.10 in its uplink. On the other hand, when a terminal transmits or receives data to another terminal, i.e., in a sidelink, it may have OH in FR1 (a frequency band equal to or less than 6 GHz)_sub6And has OH in FR2 (frequency band higher than 6 GHz)_sub6The value of (c). Regardless of the PSFCH configuration, OH_sub6The value of (d) may have a value equal to or greater than a specific value. For example, OH_sub6May have a value greater than 2/12. In the above case, OH_sub6And OH_above6Can be determined, for example, in the following method.

The method comprises the following steps: OH group_sub6Determined as 0.21, OH_above6Was determined to be 0.21.

The method 2 comprises the following steps: OH group_sub6And OH_above6The time slot proportion of PSFCH resources or resource pool of corresponding carrier waves are configured respectivelyThe periodicity of the PSFCH resources in the configuration is determined. For example, if each slot is configured with PSFCH, OH_sub6And OH_above6Can be determined to be 0.42; OH if PSFCH is configured every one of two time slots_sub6And OH_above6Can be determined to be 0.32; OH if PSFCH is configured every one of four time slots_sub6And OH_above6May be determined to be 0.26. These values may be determined as

And

specifically, OH_sub6And OH_above6Each of the PSFCH resources can be determined as the time slot proportion of the PSFCH resources configured in the resource pool configuration of the corresponding carrier

And OH_sub6And OH_above6Each may be determined by the sl-PSFCH-Period parameter included in the PSFCH configuration. OH when sl-PSFCH-Period as the PSFCH resource Period is N_sub6And OH_above6Each of which may be configured according to a resource pool of a corresponding carrier

As another example, when a terminal sends or receives data to a base station, OH^(j)Is the overhead value, OH^(j)It can be given 0.14 in the downlink of FR1 (frequency band equal to or less than 6 GHz), 0.18 in its uplink, 0.08 in the downlink of FR2 (frequency band above 6 GHz), and 0.10 in its uplink. On the other hand, when a terminal transmits or receives data to another terminal, i.e., in a 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 (psch), at least one sidelink resource pool may be configured in a terminal, and may be according to a resource pool having a maximum bandwidthTo determine OH^(j)The value is obtained.

Including the above-described method, the maximum data rate may be determined in the following manner, for example.

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

Where j is the number of aggregated component carriers in a band or band combination

R_max＝948/1024

For the jth CC, the number of CCs,

is the maximum number of supported layers given by the maximum of the downlink higher layer parameter maxNumberbMIMO-LayersPDSCH and the uplink higher layer parameter maxNumberbMIMO-LayersCB-PUSCH and maxNumberbMIMO-LayersNonCB-PUSCH.

Is the maximum supported modulation order given by the higher layer parameter supported modulationorddl for the downlink and the higher layer parameter supported modulationorderlul for the uplink.

f^(j)Is a scale factor given by a high-level parameter scalingFactor, and can take values of 1, 0.8, 0.75 and 0.4.

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

Is the average OFDM symbol duration of the parameter mu in the subframe, i.e.

Note that a normal cyclic prefix is assumed.

Is in 5.3TS 38.101-1[ 2]]And 5.3TS 38.101-2[ 3]]The maximum RB allocation in the bandwidth bw (j) with parameter μ defined in (a), wherein bw (j) is the maximum bandwidth supported by the UE in a given band or band combination.

OH^(j)Is overhead, take the following values:

0.14, frequency range FR1 for DL

0.18, frequency range FR2 for DL

0.08, frequency range FR1 for UL

0.10, frequency range FR2 for UL

0.21, frequency range FR1 for SL

0.21, frequency range FR2 for SL

Note that: for the cell running the SUL, only one of the UL or SUL carriers (the one with the higher data rate) is computed.

[ example (1-1) ]

According to an embodiment, the maximum data rate supported by a terminal may differ according to the counterpart communicating with the terminal. That is, the maximum data rate supported by the terminal may be different according to whether the terminal transmits or receives data to the base station or another terminal. The maximum data rate supported by the terminal may be determined by the following procedure.

Wherein

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

R_max＝948/1024

For the jth CC, the number of CCs,

the maximum number of supported layers is given by the maximum value of the high-layer parameter maxNumberbergMIMO-LayersPDSCH of the downlink, the high-layer parameter maxNumberbergMIMO-LayersCB-PUSCH of the uplink, the maxNumberbergeMIMO-LayersNonCB-PUSCH of the side link transmission, and the maxNumberbergeMIMO-LayersCB-PSSCH-RX of the side link reception.

Is the maximum supported modulation order given by the higher layer parameter supportmodulationorddl for downlink, the higher layer parameter supportmodulationorderlul for uplink, the higher layer parameter supportmodulationordsltx for sidelink transmission, and the higher layer parameter supportmodulationorderrx for sidelink reception.

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

Is the average OFDM symbol duration of the parameter mu in the subframe, i.e.

Note that a normal cyclic prefix is assumed.

OH^(j)Is overhead, take the following values:

0.14, frequency range FR1 for DL

0.18, frequency range FR2 for DL

0.08, frequency range FR1 for UL

0.10, frequency range FR2 for UL

0.21, frequency range FR1 for SL-TX

0.21, frequency range FR2 for SL-TX

0.21, frequency range FR1 for SL-RX

0.21, frequency range FR2 for SL-RX

In the above, maxnumberbelmimo-LayersPDSCH indicates the maximum number of layers supportable when receiving PDSCH in downlink, and maxnumberbimo-layersnobb-PUSCH indicates the maximum number of layers supportable when transmitting PUSCH through uplink. Further, in the above, maxNumberbERMIMO-LayerSCB-PSSCH-TX and maxNumberbERMIMO-LayerSCH-RX indicate the maximum number of layers that can be supported in PSSCH transmission and reception of a sidelink, respectively.

In the above, supportedmodulationorddl denotes a maximum modulation order supportable when a PDSCH is received in a downlink, and supportedmodulationordul denotes a maximum modulation order supportable when a PUSCH is transmitted through an uplink. Further, in the above, supportedModulationOrderSLTX and supportedModulationOrderSLRX indicate maximum modulation orders supportable at the time of transmission and reception in a sidelink, respectively. The terminal and base station may use at least one parameter associated with each link in determining the maximum data rate for each of the downlink, uplink, and sidelink. For example, to determine the maximum data rate of the sidelink, parameters defined for the sidelink may be used. Existing parameters may be used if no separate parameters are defined for each link. For example, a sidelink transmitting terminal may use existing uplink parameters and a sidelink receiving terminal may use existing downlink parameters.

For example, in determining the maximum transmission data rate in the sidelink, the terminal may determine the maximum transmission data rate by using OH corresponding to transmission in the frequency band used in the sidelink^(j)The maximum data rate is calculated from at least one of a value, a value configured by a maxnumberbelmimo-LayersCB-psch-TX parameter (indicating a maximum number of layers that can be supported in a psch transmission), or a value configured by a supported modulation order sltx parameter (indicating a maximum modulation order that can be supported in a psch transmission). For example, in determining the maximum received data rate in the sidelink, the terminal may determine the maximum received data rate by using an OH corresponding to reception in a frequency band used in the sidelink^(j)The maximum data rate is calculated from at least one of a value, a value configured by a maxnumberbelmimo-LayersCB-psch-TX parameter (indicating a maximum number of layers supportable in psch reception), or a value configured by a supported modulation order sltx parameter (indicating a maximum modulation order supportable in psch reception).

In the above, the following examples are described: maximum number of layers, maximum modulation order and OH^(j)The values have individual values according to the communication counterparts (downstream/upstream and sidestream) of the terminal. However, this is only an example and does not mean for example f^(j)And

the isoparameter does not have a separate value according to the communication counterpart. The above method may be applied to other parameters when the other parameters have separate values according to communication counterparts of the terminals.

[ examples (1-2) ]

According to embodiments of the present disclosure, the maximum data rate supported by a terminal may differ according to the counterpart with which the terminal communicates. That is, the maximum data rate supported by the terminal may be different according to whether the terminal transmits or receives data to the base station or another terminal. The maximum data rate supported by the terminal may be determined by the following procedure.

Wherein

J is the number of aggregation component carriers in a band or band combination. For the side chain of NR, J ═ 1.

R_max＝948/1024

For the jth CC, the number of CCs,

f^(j)Is a scale factor given by a high-level parameter scalingFactor, and can take values of 1, 0.8, 0.75 and 0.4. For NR side link, f^(j)Is 1.

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

Is the average OFDM symbol duration in the subframe of the parameter, mu, i.e.,

note that a normal cyclic prefix is assumed.

Is in 5.3TS 38.101-1[ 2]]And 5.3TS 38.101-2[3]The maximum RB allocation in the bandwidth bw (j) with parameter μ defined in (a), wherein bw (j) is the maximum bandwidth supported by the UE in a given band or band combination.

OH^(j)Is overhead, take the following values:

0.14, frequency range FR1 for DL

0.18, frequency range FR2 for DL

0.08, frequency range FR1 for UL

0.10, frequency range FR2 for UL

0.21, frequency range FR1 for SL-TX

0.21, frequency range FR2 for SL-TX

0.21, frequency range FR1 for SL-RX

0.21, frequency range FR2 for SL-RX

In the above case, J may be the number of carriers subjected to Carrier Aggregation (CA). Since CA is not supported in the side chain, J can be determined to be 1. When CA is supported in the sidelink, J is determined as the number of carriers supporting CA in the sidelink. By considering that CA is not supported, the data rate can be determined according to the following formula.

In the above, f^(j)Indicates a scale index, f^(j)The value may be different according to a counterpart communicating with the terminal. When the terminal transmits or receives data to the base station, f^(j)Can be configured by higher layer signaling, and f is used when a terminal sends or receives data to another terminal (in the case of a sidelink)^(j)The value of (c) may be predefined as a specific value (e.g., "1", the embodiment is not limited thereto) or may be configured through higher 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.

In the above, maxnumberbelmimo-LayersPDSCH indicates the maximum number of layers supportable when receiving PDSCH in downlink, and maxnumberbelmimo-layersnobb-PUSCH indicates the maximum number of layers supportable when transmitting PUSCH through uplink. Further, in the above, maxNumberbERMIMO-LayerSCB-PSSCH-TX and maxNumberbERMIMO-LayerSCH-RX indicate the maximum number of layers that can be supported when PSSCH is transmitted and received through a side link, respectively.

In the above, supportedmodulationorddl indicates a maximum modulation order supportable in PDSCH reception in downlink, and supportedmodulationordul indicates a maximum modulation order supportable in PUSCH transmission in uplink. Further, in the above, supportedModulationOrderSLTX and supportedModulationOrderSLRX indicate maximum modulation orders supportable at the time of transmission and reception in a sidelink, respectively.

The terminal and base station may use at least one parameter associated with each link in determining the maximum data rate for each of the downlink, uplink, and sidelink. For example, to determine the maximum data rate of a sidelink, one or more parameters defined for the sidelink may be used. If no separate parameters are 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.

In the side link, it may be determined according to whether the terminal supports 256QAM or not

That is, if the terminal does not support 256QAM when performing sidelink transmission, the maximum data rate of the sidelink transmission is calculated

Is determined to be 6 because 64QAM is supported at most. Further, when 256QAM is supported, the maximum data rate of the bypass transmission is calculated

Is determined to be 8. In the present disclosure, supporting 256QAM may represent an MCS table that may use 256 QAM. Whether 256QAM is supported or not can be determined by higher layer signaling of the base station or higher layer signaling between terminals. For example, when the use of the 256QAM MCS table is configured through higher layer signaling or previously defined, the terminal may determine that 256QAM is supported.

In another embodiment, in the side chain,

the resource pool configured in the sidelink BWP may be configured, or the usage may be determined according to a pre-configured MCS table. For example, if a specific terminal has a configuration that a 256QAM MCS table can be used for at least one of resource pools configured in a sidelink BWP,

may be determined to be 8, while in other cases,

may be determined to be 6.

For example, in determining the maximum transmission data rate in the sidelink, the terminal may determine the maximum transmission data rate by using OH corresponding to transmission in the frequency band used in the sidelink^(j)The maximum data rate is calculated from at least one of a value, a value configured by a maxnumberbelmimo-LayersCB-psch-TX parameter (indicating a maximum number of layers that can be supported in a psch transmission), or a value configured by a supported modulation order sltx parameter (indicating a maximum modulation order that can be supported in a psch transmission). For example, in determining the maximum received data rate in the sidelink, the terminal may determine the maximum received data rate by using a value OH corresponding to reception in a frequency band used in the sidelink^(j)By maxNumberbergMIMO-LayersCB-PSSCH-TXThe maximum data rate is calculated from at least one of a value of the parameter configuration (indicating a maximum number of layers supportable in the psch reception) or a value of the supported modulation order sltx parameter configuration (indicating a maximum modulation order supportable in the psch reception).

[ examples (1-3) ]

According to embodiments of the present disclosure, the maximum data rate supported by a terminal may differ according to the counterpart with which the terminal communicates. That is, the maximum data rate supported by the terminal may be different according to whether the terminal transmits or receives data to the base station or another terminal. The maximum data rate supported by the terminal may be determined by the following procedure. In this embodiment, the maximum data rate in the sidelink is determined according to the configured resource pool configuration, and may be determined according to the configured number of resource pools.

Wherein

J is the number of aggregation component carriers in a band or band combination. For the NR-side link, J is the number of resource pools (pre-) configured to the UE.

R_max＝948/1024

For the jth CC, (in the case of a side link, for the jth resource pool).

Is the maximum supported modulation order given by the higher layer parameter supportmodulationorddl for the downlink, the higher layer parameter supportmodulationorderlul for the uplink, the higher layer parameter supportmodulationordsltx for the sidelink transmission, and the sidelink number of received data supportmodulationorderlslrx.

And f (j) is a scale factor given by a high-level parameter scalingFactor, and can take values of 1, 0.8, 0.75 and 0.4.

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

Is the average OFDM symbol duration in the subframe of the parameter, mu, i.e.,

note that a normal cyclic prefix is assumed.

Is in 5.3TS 38.101-1[ 2]]And 5.3TS 38.101-2[ 3]]The maximum RB allocation for bw (j) in the bandwidth defined in (1), where bw (j) is the maximum bandwidth supported by the UE in a given band or band combination.

OH^(j)Is overhead, take the following values:

0.14, frequency range FR1 for DL

0.18, frequency range FR2 for DL

0.08, frequency range FR1 for UL

0.10, frequency range FR2 for UL

0.21, frequency range FR1 for SL-TX

0.21, frequency range FR2 for SL-TX

0.21, frequency range FR1 for SL-RX

0.21, frequency range FR2 for SL-RX

In the above case, J may be the number of carriers subjected to Carrier Aggregation (CA). In a side link, J may be the number of resource pools configured for the terminal.

In the above, supportedmodulationorddl denotes a maximum modulation order supportable when a PDSCH is received in a downlink, and supportedmodulationordul denotes a maximum modulation order supportable when a PUSCH is transmitted through an uplink. Further, in the above, supportedModulationOrderSLTX and supportedModulationOrderSLRX indicate maximum modulation orders supportable at the time of transmission and reception in a sidelink, respectively.

In the side chain route,

it may be determined according to whether the terminal supports 256 QAM. That is, if the terminal does not support 256QAM when performing sidelink transmission in the corresponding resource pool, the maximum data rate of the sidelink transmission is calculated

Is determined to be 6 because 64QAM is supported at most. Further, when the terminal supports 256QAM, the maximum data rate of the sidelink transmission is calculated

Is determined to be 8. Alternatively, if it is configured to use the 256QAM MCS table in the corresponding resource pool, the maximum data rate is calculated

Is determined to be 8, if it is configured not to use the 256QAM MCS table in the resource pool, in 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 mean that the 256QAM table is not included in the available MCS tables configured in the resource pool. Or, in case that 256QAM is supported in at least one resource pool configured for the terminal, when the terminal determines the maximum data rate of the sidelink, all resource pools

May be determined to be 8. The support of 256QAM in the resource pool may be a configuration in which the 256QAM MCS table is used by corresponding resource pool configuration information, or a case in which it is configured in advance in the standard so that the 256QAM MCS table is used. Such a configuration mayTo be performed by higher layer signaling of the base station or higher layer signaling between terminals.

In another embodiment, in the side chain,

the resource pool can be configured in the side road BWP, or can be determined according to a pre-configured MCS table. For example, if a specific terminal has a configuration that a 256QAM MCS table is available for at least one of resource pools configured in a sidelink BWP,

can be determined to be 8, otherwise

May be determined to be 6.

For example, in determining the maximum transmission data rate in the sidelink, the terminal may determine the maximum transmission data rate by using OH corresponding to transmission in the frequency band used in the sidelink^(j)The maximum data rate is calculated from at least one of a value, a value configured by a maxnumberbelmimo-LayersCB-psch-TX parameter (indicating a maximum number of layers that can be supported in a psch transmission), or a value configured by a supported modulation order sltx parameter (indicating a maximum modulation order that can be supported in a psch transmission). For example, in determining the maximum received data rate in the sidelink, the terminal may determine the maximum received data rate by using an OH corresponding to reception in a frequency band used in the sidelink^(j)The maximum data rate is calculated from at least one of a value, a value configured by a maxnumberbelmimo-LayersCB-psch-RX parameter (indicating a maximum number of layers supportable in psch reception), or a value configured by a supported modulation order sltx parameter (indicating a maximum modulation order supportable in psch reception). Alternatively, the OH value may be a value determined according to whether the PSFCH is configured in the resource pool.

For example, if the PSFCH is determined to be included in each slot, the OH value may be 0.35 or 5/14 because there are 5 symbols in total among 14 symbols of one slot, the first symbol including a repetition symbol used as the AGC, two symbols of the PSFCH, and a gap symbol before and after the PSFCH may be obtained without being used for data transmission. Alternatively, the OH value may be determined to be 0.45 through overhead including control information and DMRS symbols.

As another example, if the PSFCH is determined to be included in every two slots, the OH value may be 0.21 or 3/14 because in a slot in which the PSFCH can be transmitted, an overhead of 5 symbols (including the first symbol as a repetition symbol used by the AGC, two symbols of the PSFCH, and a gap symbol before and after the PSFCH) may not be used for data transmission, and in a slot in which there is no PSFCH resource, an overhead of 1 symbol (the first symbol used by the AGC) may not be used for data transmission, and thus the average thereof may be 0.21. Alternatively, the OH value may be determined to be 0.35 by an overhead including control information and DMRS symbols.

As another example, if the PSFCH is determined to be included in every four slots, the OH value may be 0.14 because an overhead of 5 symbols cannot be used for data transmission in a slot in which the PSFCH can be transmitted, and an overhead of 1 symbol cannot be used for data transmission in a slot in which the PSFCH resource does not exist, so that the average value thereof may be 0.14. Alternatively, the OH value may be determined to be 0.28 by an overhead including control information and DMRS symbols.

As yet another example, in a resource pool where the PSFCH resource is not configured, the OH value may be 0.07, since an overhead of 1 symbol (the first symbol used as AGC) cannot be used for data transmission in a slot where the PSFCH resource does not exist, and thus the OH value may be configured to be 0.28 by an overhead including control information and DMRS symbols.

the isoparameter does not have a separate value according to the communication counterpart. When other parameters have a separation according to the communication counterpart of the terminalThe above method can be applied to other parameters.

[ second embodiment ]

According to the embodiment, the terminal may determine the maximum data rate by calculating the maximum data rate according to the communication counterpart or by retrieving from a stored value. Furthermore, the determined maximum data rate may be used for comparison with the actual instantaneous data rate. This comparison can be made by the following equation 2.

In equation 2 below, the left side of the inequality may represent the instantaneous data rate of scheduled data, and the right side of the inequality DataRateCC (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 may have a value determined according to whether scheduling is used for transmitting/receiving, for example, a PDSCH or a PUSCH to/from a base station or for transmitting/receiving, for example, a pscch to/from a terminal.

[ formula 2]

In the above, L is the number of OFDM symbols allocated to the PDSCH or pscch, and M is the number of TBs transmitted through the corresponding PDSCH or pscch. In the above, L may further include an AGC symbol transmitted by the terminal through the side link.

Is obtained by

Calculated, μ is the subcarrier spacing used to transmit the PDSCH or pscch. For the mth TB, V_j.mIs based on

Calculated, a is the size of TB (TBs), C is the number of Code Blocks (CBs) included in TB, and C' is the number of code blocks scheduled in TB. In case of Code Block Group (CBG) retransmission, C and C' may be different.

Representing the largest integer no greater than x.

In the above, DataRateCC is the maximum data rate supported by the terminal in the corresponding carrier or serving cell, and may be determined based on the above equation 1. Alternatively, DataRateCC may be calculated according to the following equation 3.

[ formula 3]

Equation 3 is an equation showing an example of calculating the DataRateCC of the jth serving cell.

In formula 3, R_max＝948/1024，

Is the maximum number of layers that can be,

is the maximum modulation order, f^(j)Is a scale indicator and μ is the subcarrier spacing. The terminal can be connected with^(j)Reported as one of 1, 0.8, 0.75 and 0.4, and μ can be given in table 8 above. In addition to this, the present invention is,

is the average OFDM symbol length, can be

Is calculated as

In parallel with each other

Is the maximum number of RBs in BW (j). OH group^(j)Is an overhead value, which may give 0.14 in the downlink of FR1 (a frequency band equal to or less than 6 GHz), and 0.18 in the uplink thereof; at FR2 (above 6 GHz)Frequency band) may be given 0.08 in the downlink and 0.10 in the uplink.

Different OH groups^(j)A value may be applied to the sidelink, which may correspond to OH in FR1 (band equal to or less than 6 GHz)_sub6And OH in FR2 (band higher than 6 GHz)_above6. OH whatever the configuration of the Physical Sidelink Feedback Channel (PSFCH)_sub6May have a specific value or greater. For example, OH_sub6May have a value greater than 2/12. Or, OH^(j)May be determined by configuration values of higher layers. For example, one or more sidelink resource pools may be configured in the terminal for transmitting and receiving a Physical Sidelink Shared Channel (PSSCH), and OH^(j)The value may be determined by a parameter of a resource pool having the largest bandwidth among the sidelink resource pools. Removing OH^(j)Besides, other values may also apply different values depending on the link, i.e. whether downlink, uplink or sidelink, as described in the above embodiments.

As another example, another method of identifying whether the actual instantaneous data rate satisfies the terminal capability may be calculated based on the following equation 4. In the following equation 4, the left side of the inequality may represent instantaneous data rates of data transmitted from the J serving cells at the time of scheduling, and the right DataRate may represent a maximum data rate of the J serving cells configured in the terminal according to the terminal capability. The DataRate on the right may be a value determined according to whether the scheduling is for transmitting/receiving, for example, a PDSCH or a PUSCH to/from the base station or for transmitting/receiving, for example, a psch to/from the terminal.

[ formula 4]

In the above, J is the number of serving cells configured at the corresponding terminal within the corresponding frequency range. For the jth serving cell, M is the number of TBs transmitted in the slot. Further, it is defined as

And μ (j) is a subcarrier spacing for PDSCH or pscch in a slot of the jth serving cell. For the mth TB, V_j.mIs calculated as

A is the size of the 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 case of CBG retransmission, C and C' may be different.

Representing the largest integer no greater than x.

In the above, DataRate is a maximum data rate supported by J serving cells configured in a corresponding terminal, and may be determined based on equation 1. In equation 4, the actual average transmission rate of the terminal at a specific time (reference time) may be determined by considering the sum of the total number of bits of TBs or CBs included in the PDSCH, PUSCH, or pscch scheduled in a slot including the specific time. In the above, the time slot including the specific time may be determined as shown in fig. 13.

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

The method comprises the following steps: the terminal uses the following formula

The maximum data rate is compared to the instantaneous data rate. TBS denotes a TBS transmitted through the psch(s).

Is the slot length.

The method 2 comprises the following steps: the terminal uses the following formula

The maximum data rate is compared to the instantaneous data rate. TBS_jIndicates the TBS transmitted from the jth resource pool.

Is the slot length.

When "DataRateCC₁"is the maximum data rate in the serving cell corresponding to the terminal when communicating with the base station, and" DataRateCC₂"is a maximum data rate in a serving cell corresponding to a terminal when communicating with another terminal, the terminal may determine a value applied to the right side of equation 2 according to a communication counterpart. The maximum data rate in J serving cells of a terminal when communicating with a base station is "DataRate₁", and the maximum data rate in the J serving cells of a terminal when communicating with another terminal is" DataRate₂"the terminal may determine a value applied to the right side of equation 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 a reception or transmission operation in the corresponding slot. Specifically, the terminal may omit an operation of receiving or transmitting a PDSCH from or to the base station in a corresponding slot, or may omit an operation of transmitting or receiving a pscch in a corresponding slot.

Fig. 11B is a flowchart illustrating a method of determining whether a terminal performs PDSCH decoding, PUSCH transmission, and pscch reception according to an embodiment of the present disclosure. Referring to fig. 11B, the method may begin at 1100. The terminal may identify a peak data rate (DR _1) that may be supported in communication with the base station (operation 1107). The terminal may determine whether to perform additional V2X communication (operation 1110), and when the terminal needs to additionally perform V2X communication, i.e., when the terminal needs to perform direct communication with another terminal, the terminal may identify a peak data rate (DR _2) supportable 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 CORESET, and may determine whether the PDSCH or PUSCH is scheduled due to the monitoring of the PDCCH (operation 1120). When the PDSCH or PUSCH is scheduled due to monitoring of the PDCCH, the terminal may compare an 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 schedule (operation 1140). Due to the monitoring of the PDCCH, the terminal determines whether the psch is scheduled (operation 1125), and when the psch is scheduled, the terminal may compare the instantaneous data rate of the psch 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 psch reception operation may be performed according to a corresponding schedule (operation 1140).

[ third embodiment ]

Regarding scheduling of retransmission, for example, even if retransmission is performed, if the condition of equation 2 or equation 4 needs to be satisfied, retransmission may not be scheduled in many cases.

Fig. 12 shows an example in which channel or sidelink symbols are mapped to slots and used.

Referring to fig. 12, if TB1 satisfies a comparison between the maximum data rate and the instantaneous data rate in slot n 1200, TB1 may be initially transmitted in slot n 1200. In slot n + 11210 and slot n + 31220, TB1 may not satisfy the "comparison between maximum data rate and instantaneous data rate". Therefore, TB1 may not be retransmitted in slot n + 11210 and slot n + 31220.

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 differently applied according to whether the initial transmission or retransmission is performed. For example, the "comparison between the maximum data rate and the instantaneous data rate" using equation 2 or equation 4 is applicable only to the initial transmission between the terminal and another terminal, and the terminal may not perform the "comparison between the maximum data rate and the instantaneous data rate" in the case of retransmitting at least a portion of data included in the initial transmission. That is, in case of retransmission, the terminal may transmit or receive the pscch without performing "comparison between the maximum data rate and the instantaneous data rate".

If in SCI transmitted over PSCCHI of at least one TB_MCSA value greater than a specified value (W), then I_MCSThe value may be considered for use in side-link retransmission of at least one TB. The MCS Table used by the terminal may be configured by higher 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 can understand that, when the 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 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 retransmission.

[ fourth embodiment ]

The present embodiments relate to a method and apparatus for scheduling and receiving data so that a maximum data rate of a terminal is not exceeded when data transmission or retransmission is performed. In the current and subsequent embodiments, the data may be interchangeably referred to as TBs or transport blocks.

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 a maximum data rate of the terminal, such as a maximum number of layers supportable by the terminal, a maximum modulation order, and the like.

The maximum data rate of the terminal may be calculated based on the terminal capabilities reported to the base station and parameters configured in the terminal by the base station through RRC signaling, for example, as given in equation 1. The maximum data rate of a terminal may be determined based on the baseband processing or signal processing capabilities of the respective terminal, including channel estimation, equalization, channel coding decoding, and multi-antenna reception. That is, if a terminal has a higher maximum data rate, the terminal can be considered to have a higher signal processing capability. The terminal may calculate a "maximum data rate" for communication with the base station and a "maximum data rate" for communication with the terminal, respectively. For at least one parameter used in calculating the "maximum data rate", a different value may be used depending on the communication counterpart. The parameter may include at least one of OH and the like^(j)The parameter (c) of (c).

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.

The terminal may know the amount of data to be transmitted/received or the TBS value based on the scheduling information and may also recognize the number of symbols to which the PDSCH, PUSCH, or pscch is mapped.

If an actual data rate calculated based on information scheduled for a terminal is greater than a maximum data rate of the corresponding terminal, the terminal may not complete signal processing required to transmit and receive scheduled data within a 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 such that the actual instantaneous data rate is greater than the maximum data rate of the terminal, the terminal does not complete signal processing within a predetermined time, and thus frequency-time resources are inefficiently utilized.

The scheduling and data transmission/reception methods may be different according to the above-described calculation method of the actual instantaneous data rate. As an example, the method of identifying whether the actual instantaneous data rate satisfies the terminal capability may be calculated based on equation 2, for example.

Fig. 13 illustrates 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.

The length of the time slot may be different for each carrier according to the subcarrier spacing, and the indicated time slot corresponds to a time slot including a specific time. As the specific time is changed, for example, the reference time a is changed to the reference time B, the slots including the corresponding specific time may be changed from the slots a1, a2, and A3 to the slots B1, B2, and B3, for example.

Referring to fig. 13, a slot a1 and a slot B1 may be the same slot, and a slot a2 and a slot B2 may be the same slot. Thus, for example, only PDSCH, PUSCH, or pscch that is mapped to a slot including a reference time a corresponding to a specific time (i.e., slots a1, a2, and A3) and transmitted is considered, and a code block transmitted in the PDSCH, PUSCH, or pscch may be used in calculating an actual average transmission rate of a terminal at the reference time a.

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

In the above, formula 4 may be taken as a condition applicable to all cases including initial transmission and retransmission, and formula 2 may be taken as a condition applicable to retransmission. However, equation 2 or 4 is only an example of a condition for limiting the scheduling, and is not limited to the scope of the present disclosure.

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

In the above, the base station "schedules retransmission of a specific TB" for the terminal may represent a condition of "when MCS is larger than 27" in the case where the following MCS table 2 is configured, or a condition of "when MCS is larger than 28" in the case where a configuration other than MCS table 2 is established.

In the 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 may be interpreted as performing scheduling using an MCS value greater than 27, i.e., an MCS value of 28, 29, 30 or 31 when performing scheduling based on MCS table 2. However, the present disclosure is not limited thereto, and may be applied to the case of retransmission even if different MCS values are used.

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

[ Table 20]

[ Table 21]

[ Table 22]

Or, more specifically, I of at least one TB in DCI_MCSA case where the value is greater than a specific value (W-27 or 28) may be assumed or considered as retransmission. In the above, according to the configuration related to the MCS table to be used, for the I_MCSThe particular value of the comparison may be determined as 27 or 28.

For example, the specific value W may be determined according to a higher layer 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.

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

Therefore, a case where the base station and the terminal consider the scheduling restriction condition (e.g., equation 2) in determining the subsequent operation while retransmission is being performed may be restricted to a specific case. Meanwhile, hereinafter, equation 2 is described as an example of the scheduling restriction condition, but the embodiment of the present disclosure is not limited thereto.

As an example, the scheduling restriction condition may be applied only to a case where the number of symbols L allocated to PDSCH transmission for retransmission is less than 7. This may be a method considering the conditions given by equation 2 when performing retransmission or I of at least one TB in DCI_MCSIn case that the value is greater than a specific value (W-27 or 28), the PDSCH is mapped to a symbol 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 equation 2 is not applied.

In the present and subsequent embodiments, when the number of symbols for PDSCH mapping, the number of symbols allocated to PDSCH transmission, or the number of symbols for PDSCH transmission is determined, demodulation reference signal (DMRS) symbols of the PDSCH may also be included in the symbols for PDSCH transmission. That is, in order to determine the number of symbols, DCI indicating PDSCH mapping information and configuration information on symbols used for PDSCH transmission transmitted through higher layer signaling may be considered. Similar to the case of PUSCH, a symbol for PUSCH transmission may be determined to include a DMRS symbol of PUSCH.

In the above, the condition of equation 2 is considered only in the case where the PDSCH is mapped to a symbol less than 7 and transmitted, because the scheduling frequency at which data transmitted at the initial transmission is 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 the conditions, the complexity of the base station scheduling algorithm and the implementation method can be reduced.

In the present 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 may be extended and applied to comparison methods based on different numbers of symbols, for example, 8 symbols or 9 symbols.

In addition to the embodiment in which the scheduling restriction condition (equation 2) is applied based on whether retransmission occurs and the number of symbols of the PDSCH, equation 2 may be applied as a condition in other cases. For example, the above equation 2 may also be applied when the UE reports the Capability of fast Processing time, when higher level parameters of Capability2-PDSCH-Processing are configured, or when Processing type2Enabled in a higher level parameter set of PDSCH-ServingCellConfig (or PUSCH-ServingCellConfig) is configured as "TRUE". In the above, applying equation 2 may represent that the condition of equation 2 is recognized, and thus data transmission/reception is enabled based on scheduling only in the case where the scheduling satisfies equation 2.

[ fifth embodiment ]

The present embodiments relate to a method and apparatus for scheduling and receiving data so that a maximum data rate of a terminal is not exceeded when data transmission or retransmission is performed.

The UE capability may be reported to the base station when the terminal accesses the base station, and may include at least one parameter capable of calculating a maximum data rate of the terminal, such as a maximum number of layers that the terminal may support, a maximum modulation order, and the like.

The maximum data rate of the terminal may be calculated based on the UE capabilities reported to the base station and parameters configured in the terminal by the base station through RRC signaling, for example, as given in equation 1. The maximum data rate of a terminal may be determined based on the baseband processing or signal processing capabilities of the respective terminal, including channel estimation, equalization, channel coding decoding, and multi-antenna reception. That is, if a terminal has a higher maximum data rate, the terminal can be considered to have a higher signal processing capability. The terminal may calculate a "maximum data rate" for communication with the base station and a "maximum data rate" for communication with the terminal, respectively. For at least one parameter used in calculating the "maximum data rate", a different value may be used depending on the communication counterpart. The parameter may include at least one of OH and the like^(j)The parameter (c) of (c).

The scheduling and data transmission/reception methods may be different according to the above-described calculation method of the actual instantaneous data rate. As one example, the method of identifying whether the actual instantaneous data rate satisfies the UE capability may be calculated based on, for example, equation 2. In the above equation 2, the left side of the inequality may represent the instantaneous data rate of scheduled data, and the right side of the inequality DataRateCC (which may be determined according to UE capability) may represent the maximum data rate in the corresponding serving cell of the terminal. The DataRateCC on the right may have a value determined based on whether scheduling is used to transmit/receive, for example, a PDSCH or a PUSCH to/from a base station or to transmit/receive, for example, a pscch to/from a terminal.

As an example, another method of identifying whether the actual instantaneous data rate satisfies the UE capability may be calculated based on equation 4 above. In the following equation 4, the left side of the inequality may represent instantaneous data rates of data transmitted from the J serving cells at the time of scheduling, and the right DataRate thereof may represent a maximum data rate of the J serving cells configured in the terminal according to the UE capability. The DataRate on the right may be a value determined according to whether the scheduling is for transmitting/receiving, for example, a PDSCH or a PUSCH to/from the base station or for transmitting/receiving, for example, a psch to/from the terminal.

In the above, formula 4 may be taken as a condition applicable to all cases including initial transmission and retransmission, and formula 2 may be taken as a condition applicable to retransmission. However, equations 2 or 4 are merely examples of conditions that limit scheduling, but are not limiting to the scope of the present disclosure.

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

For example, the specific value W may be determined according to a mcs-Table-SL value or a higher layer parameter mcs-Table value included in a configuration related to PDSCH transmission, PUSCH transmission, psch 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.

The specific value W may be different according to tables determined in MCS table 1, MCS table 2, and MCS table 3 for scheduling of data transmission.

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

Therefore, a case where the base station and the terminal consider the scheduling restriction condition (e.g., equation 2) in determining the subsequent operation while retransmission is being performed may be restricted to a specific case. Meanwhile, hereinafter, equation 2 is described as one example of the scheduling constraint condition, but the embodiment of the present disclosure is not limited thereto.

As one example, when scheduling retransmission of a specific TB, a method of causing the condition of equation 2 to be applied only when the number of symbols L to which the PDSCH or pscch for retransmission is mapped is less than the number of symbols L' to which the PDSCH or pscch for initial transmission is mapped may be used. That is, when the number L of symbols mapped by the PDSCH or pscch for retransmission is greater than or equal to the number L' of symbols mapped by the PDSCH or pscch for initial transmission, the condition of equation 2 may not be applied.

In the current and subsequent embodiments, when determining the number of symbols for PDSCH or psch mapping, a demodulation reference signal (DMRS) symbol for PDSCH or psch may also be included in the symbols for PDSCH or psch transmission. That is, in order to determine the number of symbols, all DCI or SCI indicating PDSCH or psch mapping information transmitted through higher layer signaling and symbols used for PDSCH or psch transmission may be considered. Similar to the case of the PUSCH, the DMRS symbol of the PUSCH may be determined to be included in the symbol for PUSCH transmission.

Thus, when performing retransmission or when the I of at least one TB in DCI or SCI_MCSWhen the value is greater than a specific value (W ═ 27 or 28), the scheduling restriction condition given by equation 2 may be considered only in the case where the PDSCH or pscch for retransmission is mapped to symbols and transmitted, the number of the symbols being smaller than the symbols to which the PDSCH or pscch 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, so that the complexity of the base station scheduling algorithm and implementation method can be reduced.

Equation 2 may be used as a condition applied to other cases, except for an embodiment in which a scheduling restriction condition (i.e., equation 2) is applied based on whether retransmission occurs and the number of symbols of the PDSCH or the pscch. As an example, the above equation 2 may also be applied when the terminal reports the Capability of fast Processing time, when higher level parameters of Capability2-PDSCH-Processing are configured, or when Processing type2Enabled in a higher level parameter set of PDSCH-ServingCellConfig (or PUSCH-ServingCellConfig) is configured as "TRUE". In the above, applying equation 2 may mean that the condition of equation 2 is recognized, and thus data transmission/reception is enabled based on scheduling only in the case where the scheduling satisfies equation 2.

[ sixth embodiment ]

As an example, another method of identifying whether the actual instantaneous data rate satisfies the UE capability may be calculated based on equation 4 above. In the following equation 4, the left side of the inequality may represent instantaneous data rates of data transmitted from the J serving cells at the time of scheduling, and the right DataRate thereof may represent a maximum data rate among the J serving cells configured in the terminal according to the UE capability. The DataRate on the right may be a value determined based on whether the scheduling is for transmitting/receiving, e.g., PDSCH or PUSCH to/from the base station or for transmitting/receiving, e.g., psch to/from the terminal.

In the above, formula 4 may be taken as a condition applicable to all cases including initial transmission and retransmission, and formula 2 may be taken as a condition applicable to retransmission. However, equations 2 or 4 are merely examples of conditions that limit scheduling, and are not limiting to the scope of the present disclosure.

For all cases where the base station schedules retransmission of a particular TB for the terminal, for example, if the scheduling is restricted to satisfy the condition of equation 2, the retransmission may not be scheduled in many cases. In the above, the base station or another terminal "schedules retransmission of a specific TB" for the terminal may represent a condition of "when MCS (indicated by an index 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 thereof are the same as described above.

Or, more specifically, I of at least one TB in DCI or SCI_MCSA case where the value is greater than a specific value (W-27 or 28) may be assumed or considered as retransmission. In the above, according to the configuration related to the MCS table to be used, for the I_MCSThe particular value of the comparison may be determined as 27 or 28.

For example, the specific value W may be determined according to a mcs-Table-SL value or a higher layer parameter mcs-Table value included in a configuration related to PDSCH transmission, PUSCH transmission, psch 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.

For example, if a subcarrier spacing of 120kHz is used for layer 2 transmission based on 64QAM in a frequency band of 100MHz, 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 equation 2.

As one example, when scheduling retransmission of a specific TB, a method of having the condition of equation 2 applied may be used only when the number of symbols L to which the PDSCH or pscch for retransmission is mapped is less than the number of symbols L' to which the PDSCH or pscch for initial transmission is mapped and less than 7. That is, when the number L of symbols mapped by the PDSCH or psch for retransmission is equal to or greater than the number L' of symbols mapped by the PDSCH or psch for initial transmission, or when the number L of symbols mapped by the PDSCH or psch for retransmission is equal to or greater than 7, the condition of equation 2 may not be applied.

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

In the current and subsequent embodiments, when determining the number of symbols for PDSCH or PSSCH mapping, demodulation reference signal (DMRS) symbols for PDSCH or PSSCH may also be included in the symbols for PDSCH or PSSCH mapping. That is, in order to determine the number of symbols, all DCI or SCI indicating PDSCH or psch mapping information and symbols for PDSCH or psch transmission transmitted through higher layer signaling may be considered. Similar to the case of the PUSCH, the DMRS symbol for the PUSCH may be determined to be included in the symbol for PUSCH mapping.

Thus, when performing retransmission or when the I of at least one TB in DCI or SCI_MCSWhen the value is greater than a specific value (W ═ 27 or 28), the scheduling restriction condition given by equation 2 may be considered only in the case where the PDSCH or pscch for retransmission is mapped to symbols and transmitted, the number of the symbols being smaller than the symbols to which the PDSCH or pscch 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 the present embodiment, based on the base station performing initial transmission and retransmission by using the same number of symbols in many cases, and if it is more than 7 symbols, scheduling with a larger TBS often occurs.

[ seventh embodiment ]

Or, more specifically, DCI or I of at least one TB in SCI_MCSA case where the value is greater than a specific value (W-27 or 28) may be assumed or considered as retransmission. In the above, according to the configuration related to the MCS table to be used, for the I_MCSThe particular value of the comparison may be determined as 27 or 28.

For example, the specific value W may be determined according to a mcs-Table-SL value or a higher layer parameter mcs-Table value included in a configuration related to PDSCH transmission, PUSCH transmission, psch 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.

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

As one example, when scheduling retransmission of a specific TB, a method of having the condition of equation 2 applied may be used only when the number of symbols L to which the PDSCH or pscch for retransmission is mapped is less than L '-x relative to the number of symbols L' to which the PDSCH or pscch for initial transmission is mapped. That is, when the number of symbols L to which the PDSCH or pscch for retransmission is mapped is greater than or equal to the number of symbols L' -x to which the PDSCH or pscch for initial transmission is mapped, the condition of equation 2 may not be applied.

In the above, the x value may be applied as a fixed value, for example, 2 or 3, but may also be a value separately configured by the base station through higher layer signaling. For example, when the x value is configured to be 2 or predetermined, the condition of equation 2 may be applied when the number of symbols L ' mapped to the PDSCH or the pscch for retransmission is less than L ' -2 with respect to the number of symbols L ' mapped to the PDSCH or the pscch for initial transmission.

In the current and subsequent embodiments, when the number of symbols for PDSCH or PSSCH mapping is determined, demodulation reference signal (DMRS) symbols of the 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 indicating PDSCH or psch mapping information and symbols for PDSCH or psch transmission transmitted through higher layer signaling may be considered. Similar to the case of the PUSCH, the DMRS symbol for the PUSCH may be determined to be included in the symbol for PUSCH mapping.

Thus, when performing retransmission or when the I of at least one TB in DCI or SCI_MCSWhen the value is greater than a specific value (W ═ 27 or 28), the scheduling restriction condition given by equation 2 may be considered only in the case where the PDSCH or pscch for retransmission is mapped to symbols and transmitted, the number of the symbols being smaller than the symbols to which the PDSCH or pscch 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 the implementation method can be reduced by the method provided in the embodiment.

Equation 2 may be used as a condition applied to other cases, except for an embodiment in which a scheduling restriction condition (i.e., equation 2) is applied based on whether retransmission occurs and the number of symbols of the PDSCH or the pscch. As an example, the above equation 2 may also be applied when the terminal reports the Capability of fast Processing time, when higher level parameters of Capability2-PDSCH-Processing are configured, or when Processing type2Enabled in a higher level parameter set of PDSCH-ServingCellConfig (or PUSCH-ServingCellConfig) is configured as "TRUE". In the above, applying equation 2 may indicate that data transmission/reception is enabled based on scheduling only in a case where the scheduling satisfies equation 2 by recognizing the condition of equation 2.

Next, the operation of the terminal will be described.

The terminal may identify a condition for determining a subsequent operation method using DCI or SCI transmitted through the PDCCH.

According to an embodiment, as a result of identifying DCI or SCI, a subsequent operation method may be determined using the condition of the following equation 5 when performing initial transmission.

[ formula 5]

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

In the above and following embodiments, I may be assigned according to the configuration associated with the MCS table to be used_MCSThe specific value of the comparison is determined to be 27 or 28. For example, the specific value may be determined according to a mcs-Table-SL value or a higher layer parameter mcs-Table value included in a configuration related to PDSCH transmission, PUSCH transmission, psch 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.

For a receiving terminal, in the above case, J may be the total number of pschs that the terminal receives in one slot.

In sidelink operation, the receiving terminal may select J such that equation 5 satisfies the condition, and may select J pschs in descending priority order from all received pschs (i.e., select the pschs with higher QoS first). The selection may be determined randomly if the PSSCH has the same QoS. Alternatively, the selection of J pschs may be determined in ascending order of the PRB index.

According to an embodiment, whether the instantaneous data rate condition of equation 2 is used may be determined according to the length of the number L of symbols of the PDSCH or psch for retransmission, or scheduled by DCI or SCI, and/or according to the result of comparing the number L of symbols of the PDSCH or psch for retransmission with the number L' of symbols of the PDSCH or psch for initial transmission.

According to an embodiment, the number of symbols L of PDSCH or PSSCH scheduled by DCI or SCI for retransmission is less than a specific number (e.g., L < 7) and I of at least one TB in DCI or SCI_MCSIn case that the value is greater than a specific value (W-27 or 28), the terminal may use the instantaneous data rate condition of equation 2 to determine a subsequent operation method. I of at least one TB in DCI or SCI where the number L of PDSCH or PSSCH symbols used for retransmission is equal to or greater than a certain number (e.g., L ≧ 7)_MCSIn case that the value is greater than a specific value (W-27 or 28), the terminal may process the scheduled PDSCH or pscch without recognizing whether the instantaneous data rate condition of equation 2 is satisfied.

According to an embodiment, the number of symbols L of PDSCH or PSSCH for retransmission scheduled by DCI or SCI is less than the number of symbols L 'for PDSCH or PSSCH for initial transmission (e.g., L < L') and I of at least one TB in DCI or SCI_MCSIn case that the value is greater than a specific value (W-27 or 28), the terminal may use the instantaneous data rate condition of equation 2 in order to determine a subsequent operation method. When the number of symbols L of PDSCH or PSSCH for retransmission is equal to or greater than the number of symbols L 'of PDSCH or PSSCH for initial transmission (i.e., L ≧ L') and I of at least one TB in DCI or SCI_MCSIn case that the value is greater than a specific value (W-27 or 28), the terminal may process the scheduled PDSCH or the pscch without recognizing whether the instantaneous data rate condition of equation 2 is satisfied.

According to an embodiment, the number of symbols L in the PDSCH or PSSCH scheduled by DCI or SCI for retransmission is less than that of the PDSCH or PSSCH for initial transmissionSymbol number L 'and specific number (e.g., 7) of PSSCH (i.e., L < 7 and L < L') and I of at least one TB in DCI or SCI_MCSIn case that the value is greater than a specific value (W-27 or 28), the terminal may use the instantaneous data rate condition of equation 2 to determine a subsequent operation method. The number of symbols L of PDSCH or PSSCH for retransmission is equal to or greater than the initial specific number or the number of symbols L 'of PDSCH or PSSCH for initial transmission (i.e., L ≧ 7 or L ≧ L') and I of at least one TB of DCI or SCI_MCSIn case that the value is greater than a specific value (W-27 or 28), the terminal may process the scheduled PDSCH or the pscch without recognizing whether the instantaneous data rate condition of equation 2 is satisfied.

According to an embodiment, when the number of symbols L of PDSCH or PSSCH for retransmission scheduled by DCI or SCI is less than the minimum of the number of symbols L 'of PDSCH or PSSCH for initial transmission and a specific number (e.g., 7) (i.e., L < min (7, L')) and I of at least one TB in DCI or SCI_MCSIn case that the value is greater than a specific value (W-27 or 28), the terminal may use the instantaneous data rate condition of equation 2 to determine a subsequent operation method. The number of symbols L in PDSCH or PSSCH for retransmission is equal to or greater than the minimum value of the number of symbols L 'of PDSCH or PSSCH for initial transmission and a specific number (e.g., 7) (i.e., L ≧ min (7, L')) and the I of at least one TB in DCI or SCI_MCSIn case that the value is greater than a specific value (w-27 or 28), the terminal may process the scheduled PDSCH or the pscch without recognizing whether the instantaneous data rate condition of equation 2 is satisfied.

According to an embodiment, the number of symbols L in the PDSCH or PSSCH scheduled by DCI or SCI for retransmission is less than the difference between the number of symbols L' of the PDSCH or PSSCH for initial transmission and the specific number of symbols x (i.e., L<L' -x)) and at least one TB in DCI or SCI_MCSIn case that the value is greater than a specific value (W-27 or 28), the terminal may use the instantaneous data rate condition of equation 2 to determine a subsequent operation method. When the number L of PDSCH or PSSCH symbols for retransmission is equal to or greater than the difference between the number L 'of PDSCH or PSSCH symbols for initial transmission and the number x of specific symbols (i.e., L ≧ L' -x)) and the I of at least one TB of the DCI or SCI_MCSIn case that the value is greater than a specific value (W-27 or 28), the terminal may process the scheduled PDSCH or pscch without recognizing whether or not to recognizeThe instantaneous data rate condition of equation 2 is satisfied. The value of x may be applied as a fixed value, for example 2 or 3. Alternatively, the x value may be a value separately configured by the base station through higher layer signaling.

According to an embodiment, the terminal may determine the number of symbols L of the PDSCH or psch for retransmission scheduled by the DCI or SCI by including punctured symbols (punctured symbols).

According to an embodiment, the terminal may determine the number of symbols L of the PDSCH or psch for retransmission scheduled by the DCI or SCI by excluding punctured symbols.

The above embodiments may be applied to the PUSCH in the same manner. The above embodiments may be applied to the physical sidelink shared channel (pscch) in the same manner.

[ eighth embodiment ]

Fig. 14 illustrates a terminal operation for downlink reception or sidelink transmission/reception according to an embodiment of the present disclosure.

Referring to fig. 14, the terminal may perform monitoring of a PDCCH (or PSCCH, which is equally applicable to the cases of fig. 14 to 20B below) in a predetermined resource (operation 1410).

The terminal decodes DCI transmitted through the PDCCH from the base station (or SCI transmitted through the PSCCH from another terminal, the same applies to the cases of fig. 14 to 20B below), and can recognize whether the instantaneous data rate condition is satisfied. If it is required to identify whether the instantaneous data rate condition is satisfied, the terminal may identify whether the PDSCH or pscch scheduled by the corresponding DCI satisfies the above-described instantaneous data rate condition (operation 1420).

If the instantaneous data rate condition is satisfied, the terminal may perform an operation of receiving the scheduled PDSCH or transmitting and receiving the pscch (operation 1430).

If the instantaneous data rate condition is not satisfied, the terminal may not perform an operation of receiving the scheduled PDSCH or an operation of transmitting and receiving the pscch (operation 1440). The terminal may stop buffering the PDSCH or the pscch or may not perform a buffering operation of the PDSCH or the pscch. Although not shown, in the case where the terminal transmits the psch, when the instantaneous data rate condition is not satisfied, the generation of the psch may be stopped or the generation operation may not be performed.

[ ninth embodiment ]

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

Referring to fig. 15, the terminal may perform PDCCH monitoring in a predetermined resource (operation 1510).

The terminal decodes DCI transmitted through the PDCCH from the base station and can recognize whether it is necessary to recognize whether the above-described instantaneous data rate condition is satisfied. If it is required to identify whether the instantaneous data rate condition is satisfied, the terminal may identify whether the PDSCH or pscch scheduled by the corresponding DCI satisfies the above-described instantaneous data rate condition (operation 1520).

If the instantaneous data rate condition is satisfied, the terminal may perform an operation of receiving the scheduled PDSCH or transmitting and receiving the pscch (operation 1530).

If the instantaneous data rate condition is not satisfied, the terminal may perform PDSCH or PSSCH buffering (i.e., storing information values of the PDSCH or PSSCH in a buffer), and if the PDSCH or PSSCH corresponds to retransmission, the terminal may perform Chase Combining (CC) or Incremental Redundancy (IR) combining based on Log Likelihood Ratio (LLR) information stored in a soft buffer and corresponding to the PDSCH or PSSCH according to the HARQ scheme (operation 1540). The terminal may start the decoding process when the value of SNR or energy of the buffered or combined result satisfies a certain condition. Alternatively, the terminal may start the decoding process after performing the combining more than a predetermined number of times, i.e., after the received data is retransmitted more than a predetermined number of times.

[ tenth embodiment ]

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

Referring to fig. 16, the terminal may perform PDCCH monitoring in a predetermined resource or a configured resource (operation 1610).

The terminal decodes DCI transmitted through the PDCCH from the base station and can recognize whether it is necessary to recognize whether an instantaneous data rate condition is satisfied. If it is required to identify whether the instantaneous data rate condition is satisfied, the terminal may identify whether the PDSCH or pscch scheduled by the corresponding DCI satisfies the instantaneous data rate condition (operation 1620).

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

If the instantaneous data rate condition is not met, the terminal may perform PDSCH or PSSCH buffering (1641) and may identify whether PDSCH or PSSCH resources were 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 pre-allocated PDSCH or pscch resources are punctured. Such an RNTI may be, for example, an INT-RNTI.

When the RNTI is configured, the terminal may store only LLR values transmitted to the data part of the non-punctured resources 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 satisfies a certain condition. Alternatively, the terminal may start the decoding process after performing the combining more than a predetermined number of times, i.e., after receiving the retransmission more than a predetermined number of times. The terminal disregards (or discards) the value according to the signal transmitted from the punctured resource.

[ eleventh embodiment ]

Fig. 17 is another diagram illustrating a terminal operation for downlink reception or psch transmission/reception according to an embodiment of the present disclosure, and fig. 18 is another diagram illustrating a terminal operation for downlink reception or psch transmission/reception according to an embodiment of the present disclosure.

Referring to 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 the PDSCH or the psch scheduled by the DCI transmitted through the PDCCH without classifying based on the length of the PDSCH or the psch and/or without recognizing whether an instantaneous data rate condition is satisfied (operation 1720). Further, the terminal may determine resources (frequency and time) in which HARQ-ACK information is to be transmitted through the transmitted DCI.

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

In addition, the terminal may recognize 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 (e.g., PUCCH generation time for HARQ-ACK transmission, and this may be determined by UE capability) that is a predetermined time before the start of the first symbol of the HARQ-ACK transmission PUCCH resource. The terminal may determine the deadline and determine whether the deadline has been reached.

When the HARQ-ACK update timing is reached, and if the PDSCH or pscch decoding is completed, the terminal may update corresponding HARQ-ACK information based on the result thereof (operation 1750). For example, if PDSCH or pscch decoding is successful, the terminal may 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 transmits 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 may transmit pre-configured HARQ-ACK information (i.e., NACK information).

Meanwhile, referring to fig. 18, when PDSCH or pscch decoding is not completed, the terminal may continue decoding although the transmission time of HARQ-ACK information has elapsed (operation 1810).

The terminal recognizes whether the PDSCH or pscch decoding is successful (operation 1820), and if the decoding is successful, the terminal does not process data retransmitted by the network through the PDSCH or retransmitted by another terminal through the psch, and may transmit ACK (retransmission according to DCI scheduling) in the newly designated HARQ-ACK information transmission resource (operation 1830). If the decoding is unsuccessful, the terminal may continue the decoding process after performing CC combining or IR combining based on data retransmitted by the network through the PDSCH or retransmitted by another terminal through the psch according to the designated or determined HARQ scheme (operation 1840).

According to another embodiment, the terminal may perform PDCCH monitoring in a predetermined resource or a configured resource.

The terminal decodes DCI transmitted through the PDCCH from the base station and can recognize whether it is necessary to recognize whether an instantaneous data rate condition is satisfied. If it is required to identify whether the instantaneous data rate condition is satisfied, the terminal may determine whether the PDSCH or pscch scheduled by the corresponding DCI satisfies the instantaneous data rate condition.

The terminal may perform an operation of receiving the scheduled PUSCH or pscch if the instantaneous data rate condition is satisfied. Although not shown, when the instantaneous data rate condition is not satisfied, the terminal may not perform a preparation operation (e.g., data preparation according to the HARQ scheme) for transmitting the scheduled PUSCH or pscch.

The terminal may perform a preparation operation (e.g., at least one of data preparation according to the HARQ scheme, scrambling, modulation, etc.) for transmitting the PUSCH or pscch scheduled by the DCI transmitted through the PDCCH without classifying according to the length of the PUSCH or pscch and/or without recognizing whether an instantaneous data rate condition is satisfied.

The terminal may determine resources (frequency and time) to transmit the PUSCH or the pscch based on the DCI. Although not shown, when the preparation of the PUSCH or psch transmission is completed before the PUSCH transmission timing, the terminal may still perform the PUSCH or psch transmission on the scheduled PUSCH or psch resources, and if not, the terminal may stop the PUSCH or psch transmission preparation operation.

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

The base station may perform an operation of detecting the DMRS in the scheduled resource. If the DMRS is detected, the base station may continue an operation of receiving data of the PUSCH, and if the DMRS is not detected, the base station may not perform the operation of receiving data of the PUSCH.

[ twelfth embodiment ]

Fig. 19 illustrates the operation of a base station according to an embodiment of the present disclosure.

Referring to fig. 19, a 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, higher layer parameters (e.g., RRC parameters) related to the initial access terminal, the new RRC-configured terminal, the terminal for which the higher layer parameters have changed, and the terminal for which the UE capability exchange has occurred (e.g., RRC parameters).

The base station can calculate the maximum data rate of each terminal using the above parameters and equation 1. The base station may calculate a maximum data rate, i.e., whether the terminal transmits or receives data to the base station or whether the terminal transmits or receives data to another terminal, according to a communication counterpart with which the terminal communicates (operation 1920).

In addition, the base station may calculate the TBS_thresholdThe value (operation 1930). Here, TBS_thresholdIt may be calculated based on the size of the specific resource, e.g. at least one of the information related to the size of the specific resource, e.g. the number of symbols having a specific length, etc. For calculating TBS_thresholdMay be the number of symbols included in one slot.

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

Scheduling for retransmissions may be required due to scheduling of the initial transmission or decoding failure of the initial transmission. Here, the base station may determine a terminal that requires such scheduling (operation 2010).

Referring to fig. 20A, the base station may determine an MCS of a scheduling terminal based on the determined Channel State Information (CSI) of the terminal, etc. (operation 2020).

In addition, the base station may identify the TBS determined for each terminal_Threshold(operation 2030), and may be based on the TBS_ThresholdA scheduled resource size of the terminal is determined (operation 2040).

Fig. 20B illustrates an embodiment of determining scheduled resources for a terminal according to an embodiment of the disclosure.

According to an embodiment of determining scheduling resources of a terminal, a base station may determine a minimum scheduling unit resource (operation 2041). The minimum scheduling unit resource may be N RBs (where N ═ 1, 2, 3.).

Referring to 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 terminals_ThresholdAnd whether it is satisfied, while adding the minimum scheduling unit resource, for example, 1 RB each (operation 2043).

If, as a result of the comparison, the TBS_ThresholdIs satisfied (i.e., the TBS calculated based on the scheduled RBs is less than the TBS_Threshold) The base station may additionally allocate a minimum scheduling unit resource (operation 2045). If TBS is not satisfied_Threshold(i.e., when the TBS calculated based on the scheduled RBs is equal to or greater than the TBS_Threshold) The terminal may determine the number of scheduling unit resources (operation 2047).

According to another embodiment of determining the scheduling resources of the terminal, the base station may calculate in advance a TBS value corresponding to the minimum number of scheduling unit resources and store it in a table. Thus, the base station may determine that the TBS is satisfied_ThresholdThe number of scheduling unit resources of value is calculated without adding the scheduling unit resources.

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

In the above-described embodiment, the example of PDSCH transmission has been described, but the embodiment may be applied to PUSCH transmission or psch transmission. In this case, the UE capability information and the base station configuration information related to downlink transmission used in the above-described embodiments may be changed to and applied to the UE capability information and the base station configuration information related to uplink transmission.

[ thirteenth embodiment ]

A thirteenth embodiment provides a method of determining a data rate according to a frequency band used by a terminal for communication or a combination of frequency bands thereof.

The maximum data rate of the sidelink of the terminal may be calculated as described in the first embodiment, the (1-1) th embodiment, the (1-2) th embodiment, and the (1-3) th embodiment, and may be determined according to the UE capability. In particular, the value of f as the scaling factor may be determined as follows.

f^(j)Is a scale factor given by the high level parameter scalingFactor and can take values of 1, 0.8, 0.75 and 0.4.

The value of f may be determined from the scalingFactor parameter, which is higher layer signaling, which may be determined as one of 0.8, 0.75, and 0.4 (this does not limit the case where new values are added), which may be considered to be 1 if the parameter is not configured or reported.

However, the scalingFactor parameter may be a parameter value that the terminal reports to the base station or reports or transmits to a neighboring terminal. The value may be different according to a frequency band supported by the terminal or a combination of frequency bands thereof, and may be transmitted using one of the following methods or a combination of the following methods.

-method 1: determining a scale factor using per-Uu-band-combination

-method 2: determination of scale factors using per-PC5-band-combination

-method 3: determination of scale factors using per-Uu-band-combination-and-per-PC5-band-combination

-method 4: determination of scale factor using per-PC5-band

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 may be configured to be 0.4 and 0.75. In the case of a combination of different frequency bands, the value of f may be different even if the frequency bands have the same number.

In the case of using the above-described method 3, the baseband processing capability that the terminal can use in the PC5 band may be different depending on whether or not 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 be different depending on whether the terminal activates the PC5 band, i.e., whether the terminal performs a sidelink operation, or whether the terminal activates the V2X function. That is, since the baseband processing capability that the terminal can actually use differs depending on whether the Uu and PC5 frequency bands are activated, it is necessary to change the f-number (for calculating the data rate) that the terminal should apply.

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

In order to solve the above problem, the following method can be considered.

-method 1: the terminal may transmit information of the PC5 band or information of the PC5 band combination (e.g., a band list), which is being activated by the terminal itself, to the base station. This information may be transmitted through higher layer signaling (RRC signaling, UE capabilities), etc.

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

-method 3: the base station may schedule the terminal under the following assumptions: the terminal always activates the PC5 band if the PC5 band is included in the band combination reported by the terminal through the UE capability. For example, when a terminal reports an n71 frequency band and simultaneously reports a frequency band combination of n71-n47, if a base station performs scheduling for the terminal in an n71 frequency band, the base station may perform DL and UL scheduling by considering a scale factor of the frequency band combination of n71-n47 reported by the terminal and may perform data scheduling within a maximum TBS corresponding thereto.

-method 4: the terminal may transmit information of the Uu band or information of a combination of the Uu bands (e.g., a band list) to other neighboring terminals, which is being activated by the terminal itself. This information may be transmitted through higher layer signaling (RRC signaling, UE capabilities), etc.

-method 5: when data transmission is performed through the sidelink, the terminal may generate the sidelink TBS to perform the data transmission, assuming that the capabilities of the neighboring terminals have a minimum value (0.4 in the above example) among the scalingFactor values in the corresponding sidelink frequency band.

-method 6: the terminal may differently determine whether to perform base station scheduled DL data (PDSCH) reception and UL data (PUSCH) transmission according to whether the terminal itself is currently performing the PC5 operation. That is, when the terminal reports f to 1 (or may not report f value) for the n71 band, and reports f to 0.75, i.e., a proportional value in the n71 band, for the band combination of n71-n47, if the terminal performs transmission/reception or an operation related thereto in the side link 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 to 0.75.

On the other hand, in the above-described example, when the terminal does not perform transmission/reception or an operation related thereto in the sidelink frequency band n47, the terminal may determine whether to perform DL data (PDSCH) reception and UL data (PUSCH) transmission in the n71 frequency band according to the maximum data rate calculated based on f ═ 1. On the other hand, even in the case of a sidelink, the required sidelink f-value may be determined differently depending on whether or not a sidelink operation is performed in the Uu band, based on the data rate of the sidelink to be calculated when determining whether or not to transmit/receive sidelink data pscch.

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

The operation of the terminal performing the current embodiment may be, for example, as follows. The operations of the terminal need not perform all of the described operations, one or more of the operations described below may be performed, and the order may be changed.

Fig. 21 illustrates an operation of a terminal performing an embodiment according to the present disclosure.

Referring to fig. 21, the terminal may transmit capability information of the terminal itself to the base station (operation 2100). The capability information may include information of a band combination of the Uu band and the PC5 band (supportable by the terminal) which are regarded as being able to coexist. Thereafter, the terminal reports to the base station whether the terminal itself operates a sidelink (or may understand whether the terminal is performing a sidelink 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 a "maximum data rate" for communication with the base station and/or a "maximum data rate" for communication with another terminal by using the scale factor parameter configured according to the current embodiment according to whether the sidelink is operated (operation 2140). Thereafter, the terminal may transmit or receive a signal to the base station and/or another terminal or determine whether transmission or reception is performed based on the calculated maximum data rate.

The transmitter, receiver and processor of the terminal and base station for performing embodiments of the present disclosure are shown in fig. 22 and 23, respectively. 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, processor and transmitter of the base station and the terminal may operate according to the above-described embodiments.

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

Referring to 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 signals 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 frequency of the received signal and down-converting the frequency of the received signal.

Further, the transceiver may receive a signal through a wireless channel, output the signal to the terminal processor 2204, and transmit the signal output from the terminal processor 2204 through the wireless channel. The terminal processor 2204 may control a series of processes so that the terminal can operate according to the above-described embodiments. For example, the terminal receiver 2200 receives data and control information including scheduling information for data transmission from the base station, and the terminal processor 2204 may compare the peak data rate and the amount of scheduling data of the terminal and determine whether to decode and transmit, and perform signal processing accordingly. Thereafter, a signal that needs to be transmitted by the terminal transmitter 2202 can be transmitted to the base station or another terminal.

Referring to 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 this disclosure, the base station receiver 2301 and the base station transmitter 2303 may be collectively referred to as a transceiver. The transceiver may transmit signals to or receive signals from the 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 frequency of the received signal and down-converting the frequency of the received signal. Also, the transceiver may receive a signal through a wireless channel, output the signal to the base station processor 2305, and transmit the signal output from the base station processor 2305 through the wireless channel.

The base station processor 2305 may control a series of processes so that the base station may operate according to the above-described embodiments. For example, base station processor 2305 may calculate a peak data rate for the terminal, determine the TBS within a range that does not exceed the peak data rate, and schedule the TBS to generate control information.

Thereafter, control information generated by the base station transmitter 2303 may be transmitted, and the base station receiver 2301 may receive uplink data signals and feedback for the terminal.

In order to solve the above problem, 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 a scheduling restriction condition is determined according to Downlink Control Information (DCI) decoded as a monitoring result; identifying whether a Physical Downlink Shared Channel (PDSCH) scheduled by the DCI satisfies a scheduling restriction condition if the scheduling restriction condition needs to be determined; and receiving data from the base station through the PDSCH when the scheduling restriction condition is satisfied.

In order to solve the above problem, the present disclosure provides a terminal including: a transceiver; and a controller configured to: monitoring a Physical Downlink Control Channel (PDCCH); identifying whether a scheduling restriction condition is determined according to Downlink Control Information (DCI) decoded as a monitoring result; identifying whether a Physical Downlink Shared Channel (PDSCH) scheduled by the DCI satisfies a scheduling restriction condition if the scheduling restriction condition needs to be determined; and receiving data from the base station through the PDSCH when the scheduling restriction condition is satisfied.

In the drawings describing the methods of the present disclosure, the order in which the description is made 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.

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

Moreover, in the methods of the present disclosure, some or all of the contents of each embodiment may be combined without departing from the basic spirit and scope of the present disclosure.

While the disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents. Further, the respective embodiments described above may be used in combination as necessary. For example,

embodiments

1 and 2 may be used in combination, or a part of embodiment 1 and a part of embodiment 2 may be used in combination. In addition, based on the technical idea of the present embodiment, other variations of the above-described embodiments may be implemented in LTE and 5G systems.

Claims

1. 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 identifying a data rate of the communication; and

identifying the data rate based on the at least one parameter and the following formula:

2. the method of claim 1, wherein the first and second light sources are selected from the group consisting of,

wherein the at least one parameter comprises an overhead parameter OH, and

wherein the value of the overhead parameter is based on a frequency range associated with communication of the other terminal.

3. The method of claim 2, wherein the value of the overhead parameter for frequency ranges below 6GHz is greater than 2/12.

4. The method of claim 1, wherein the at least one parameter comprises a modulation parameter Q_mSaid modulation parameter Q_mIs the maximum supported modulation order of the terminal between 6 or 8.

5. The method of claim 1, wherein the at least one parameter comprises a scaling factor f, the scaling factor f being configured by higher layer signaling.

6. The method of claim 5, wherein one value of the scaling factor is 1.

7. The method of claim 1, wherein the at least one parameter comprises a parameter v_LayersSaid parameter v_LayersIs the maximum number of supported layers for communicating with the other terminal.

8. A terminal in a communication system, the terminal comprising:

a transceiver; and

a controller coupled to the transceiver, the controller configured to:

9. the terminal according to claim 8, wherein,

wherein the at least one parameter comprises an overhead parameter OH, and

10. The terminal of claim 9, wherein the value of the overhead parameter for frequency ranges below 6GHz is greater than 2/12.

11. The terminal of claim 8, wherein the at least one parameter comprises a modulation parameter Q_mSaid modulation parameter Q_mIs the maximum supported modulation order of the terminal between 6 or 8.

12. The terminal of claim 8, wherein the at least one parameter comprises a scaling factor f, the scaling factor f being configured by higher layer signaling.

13. The terminal of claim 12, wherein one value of the scaling factor is 1.

14. The terminal of claim 8, wherein the at least one parameter comprises a parameter v_LayersSaid parameter v_LayersIs the maximum number of supported layers for communicating with the other terminal.