Method and device for sending / receiving channel state information in wireless communication system

Abstract

The present disclosure relates to a communication technology and system for integrating IoT technology with a 5G communication system to support a higher data transmission rate than a 4G system. The present disclosure can be applied to smart services based on 5G communication technology and IoT-related technologies (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail, safety and security-related services, etc.). In addition, the present disclosure can be applied to a method and apparatus for sending / receiving channel state information in a communication system.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more specifically, to a method and apparatus for transmitting / receiving related signals and physical channels to exchange channel state information of a side link. More specifically, the present disclosure relates to a method for configuring control information when a terminal transmits control information and a reference signal through a side link, and when another terminal measures a channel from a reference signal and transmits the channel measurement result to a terminal that has transmitted the reference signal, and a method and apparatus for mapping and transmitting / receiving channel state information. Background Art

[0002] In order to meet the demand for wireless data traffic that has increased since the deployment of 4G communication systems, efforts have been made to develop improved 5G or quasi-5G communication systems. Therefore, 5G or quasi-5G communication systems are also referred to as "super 4G networks" or "post-LTE systems". 5G communication systems are considered to be implemented in higher frequency (millimeter wave) bands (such as 60GHz bands) in order to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, technologies such as beamforming, massive multiple input multiple output (MIMO), full-dimensional MIMO, array antennas, analog beamforming, and massive antennas are discussed in 5G communication systems. In addition, in 5G communication systems, development of system network improvements is being carried out based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP), receiving-end interference elimination, etc. In the 5G system, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) are also developed as advanced coding modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) are also developed as advanced access technologies.

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

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

[0005] Technical issues

[0006] In a wireless communication system (particularly a new radio (NR) system), signals can be sent / received between terminals via a side link. For example, a terminal can send side link control information, data, etc. to another terminal. If the transmitter knows the channel state between the transmitter and the receiver related to this communication method using the side link, the transmitter can send a signal to the receiving terminal after optimally selecting a scheduling parameter (such as MCS or the number of frequency resources) according to the channel. This can be similar to the case where data is communicated between a base station and a terminal using a downlink and an uplink, where the terminal observes a reference signal from the base station, finds the channel state of the downlink, and transmits channel state information (CSI) to the base station. That is, the transmitting terminal can send a reference signal to the receiving terminal via a side link, and the receiving terminal can measure the channel state of the side link from the transmitted reference signal, and can send the measured channel state information to the transmitting terminal. In this case, the present disclosure provides a method for transmitting indication information indicating the transmission of channel state information, indication information indicating that the channel state information is included, etc., and a method and apparatus for determining which resource will be used to send / receive channel state information, thereby facilitating the exchange of channel state information via a side link.

[0007] Technical solutions to the problem

[0008] An embodiment of the present disclosure for solving the above-mentioned problems may provide a method performed by a first terminal in a wireless communication system, the method comprising: obtaining channel state information (CSI); sending a physical sidelink control channel (PSCCH) including sidelink control information (SCI) to a second terminal; and sending a physical sidelink shared channel (PSSCH) including CSI and data received from a higher layer to the second terminal, wherein the SCI includes quality of service (QoS) information and mapping information associated with the CSI and the data, and wherein the QoS information is determined based on whether the CSI is sent via the PSSCH.

[0009] In addition, an embodiment of the present disclosure may provide a first terminal of a wireless communication system, the first terminal including: a transceiver; and a controller, the controller being configured to perform control to obtain channel state information (CSI), send a physical sidelink control channel (PSCCH) including sidelink control information (SCI) to a second terminal via the transceiver, and send a physical sidelink shared channel (PSSCH) including CSI and data received from a higher layer to the second terminal via the transceiver, wherein the SCI includes quality of service (QoS) information and mapping information associated with the CSI and the data, and wherein the QoS information is determined based on whether the CSI is sent via the PSSCH.

[0010] In addition, an embodiment of the present disclosure may provide a method performed by a second terminal in a wireless communication system, the method comprising: sending a channel state information (CSI) reference signal (RS) to a first terminal; receiving a physical sidelink control channel (PSCCH) including sidelink control information (SCI) from the first terminal; and receiving a physical sidelink shared channel (PSSCH) including CSI and data from the first terminal based on the SCI, wherein the SCI includes quality of service (QoS) information and mapping information associated with the CSI and the data, and wherein the QoS information is determined based on whether the CSI is sent via the PSSCH.

[0011] In addition, an embodiment of the present disclosure may provide a second terminal of a wireless communication system, the second terminal including: a transceiver; and a controller, the controller being configured to perform control to send a channel state information (CSI) reference signal (RS) to a first terminal via the transceiver, receive a physical sidelink control channel (PSCCH) including sidelink control information (SCI) from the first terminal via the transceiver, and receive a physical sidelink shared channel (PSSCH) including CSI and data from the first terminal via the transceiver based on the SCI, wherein the SCI includes mapping information associated with quality of service (QoS) information and the CSI and the data, and wherein the QoS information is determined based on whether the CSI is sent via the PSSCH.

[0012] Advantageous Effects of the Invention

[0013] Embodiments of the present disclosure may provide a method and apparatus for transmitting / receiving channel state information in communication. In addition, embodiments of the present disclosure may provide a method and apparatus for transmitting / receiving channel state information through a side link. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The basic structure of the time-frequency domain according to an embodiment of the present disclosure is shown, where the time-frequency domain is a radio resource domain for transmitting data or a control channel in a downlink or uplink in an NR system;

[0015] Figure 2 An aspect is shown in which multiple pieces of data for eMBB, URLLC, and mMTC (which are services considered in 5G or NR systems) are allocated in frequency-time resources according to an embodiment of the present disclosure;

[0016] Figure 3A An aspect is shown in which data segments for eMBB, URLLC and mMTC (which are services considered in 5G or NR systems) are allocated in frequency-time resources according to an embodiment of the present disclosure;

[0017] Figure 3BA process in which one transport block is divided into a plurality of code blocks and a CRC is added to the plurality of code blocks according to an embodiment of the present disclosure is shown;

[0018] Figure 4A Methods associated with channel state information (CSI) reference signals (RS) and reporting in LTE and LTE-Advanced (LTE-A) systems according to embodiments of the present disclosure are shown;

[0019] Figure 4B It shows that various services in the NR system are multiplexed on time and frequency resources;

[0020] Figure 4C The relationship between CSI report settings, reference signal settings and CSI measurement settings is shown;

[0021] Figure 5A An example of candidate activation through MAC CE and subsequent activation of a substantial semi-persistent channel state report through DCI according to an embodiment of the present disclosure is shown;

[0022] Figure 5B An example of terminal operation of reporting aperiodic channel status in an initial report of a semi-persistent channel status report according to an embodiment of the present disclosure is shown;

[0023] Figure 5C An example of simultaneously supporting Type I and Type II channel reporting according to an embodiment of the present disclosure is shown;

[0024] Figure 5D shows an example of time and frequency spacing between reference signals according to an embodiment of the present disclosure;

[0025] Figure 5E is a flowchart showing an operation sequence of a terminal according to an embodiment of the present disclosure, and Fig. 6A An example of performing one-to-one communication (i.e., unicast communication) between two terminals through a side link according to an embodiment of the present disclosure is shown;

[0026] Figure 6B An example of multicast communication in which one terminal sends common data to multiple terminals via a side link according to an embodiment of the present disclosure is shown;

[0027] Figure 6C It is shown that according to an embodiment of the present disclosure, a terminal that has received public data through multicast sends information related to success or failure of data reception to a terminal that has sent data;

[0028] Figure 7The state in which the synchronization signal and the physical broadcast channel (PBCH) of the NR system are mapped in the frequency domain and the time domain according to an embodiment of the present disclosure is shown;

[0029] Figure 8 shows the symbols to which one SS / PBCH block in a time slot is mapped according to an embodiment of the present disclosure;

[0030] Fig. 9 shows symbols to which SS / PBCH blocks may be transmitted according to subcarrier spacing according to an embodiment of the present disclosure;

[0031] Fig.10 shows symbols to which SS / PBCH blocks may be transmitted according to subcarrier spacing according to an embodiment of the present disclosure;

[0032] Fig.11 An example of a resource pool according to an embodiment of the present disclosure is shown, where the resource pool is defined as a set of resources in the time domain and the frequency domain for transmission or reception over a side link;

[0033] Fig.12 An example of a method of resource allocation (mode 1) through scheduling of a side link according to an embodiment of the present disclosure is shown;

[0034] Fig.13 An example of a method for UE autonomous resource allocation (mode 2) through a side link according to an embodiment of the present disclosure is shown;

[0035] FIG. 14 shows an example of a method for setting sensing window A and sensing window B for UE autonomous resource allocation (mode 2) through a side link according to an embodiment of the present disclosure;

[0036] Fig.15 A "mode 1" method according to an embodiment of the present disclosure is shown, which is a method of receiving scheduling information from a base station and performing sidelink data transmission;

[0037] Fig.16 An example is shown in which CSI information is transmitted through the PSSCH while data (ie, transport block information) transmitted from a higher layer to the PSSCH is also transmitted according to an embodiment of the present disclosure;

[0038] Fig.17 An example is shown in which only CSI information is included in the PSSCH and transmitted according to an embodiment of the present disclosure;

[0039] Fig.18 An example of a time slot structure when transmitting a CSI-RS and an example of a time slot structure when reporting CSI information according to an embodiment of the present disclosure are shown;

[0040] Fig.19An example of a method of determining a QoS value to be included in control information for scheduling a PSSCH to which CSI is mapped by piggybacking CSI information onto a PSSCH according to an embodiment of the present disclosure is shown;

[0041] Fig. 20 An example of a method of determining a QoS value to be included in control information for scheduling a PSSCH to which CSI is mapped when CSI information is transmitted using a MAC CE transmitted through a PSSCH according to an embodiment of the present disclosure is shown;

[0042] Fig.21 An example of mapping sidelink CSI to PSSCH according to an embodiment of the present disclosure is shown;

[0043] Fig. 22 Another example of mapping sidelink CSI to PSSCH according to an embodiment of the present disclosure is shown;

[0044] Fig.23 is a block diagram showing an internal structure of a UE according to an embodiment of the present disclosure; and

[0045] Fig.24 is a block diagram showing an internal structure of a base station according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0046] New Radio (NR) access technology is a new 5G communication scheme designed to enable various services to be freely multiplexed in time and frequency resources. Therefore, in the NR system, waveforms / parameter sets (numerology), reference signals, etc. can be dynamically or freely allocated according to the needs of the corresponding services. In order to provide the best service to the terminal in wireless communication, it is necessary to perform data transmission optimized based on the measurement of channel quality and interference. Therefore, it is crucial to accurately measure the channel state. However, unlike 4G communications where the channel and interference characteristics vary significantly depending on the frequency resources, in the case of 5G channels, the channel and interference characteristics vary significantly depending on the service. Therefore, subset support in the frequency resource group (FRG) dimension may be required to measure the channel and interference characteristics separately for each frequency resource. At the same time, the types of services supported in the NR system can be classified as enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable and low-latency communication (URLLC). eMBB can be a service aimed at high-speed transmission of large-capacity data. mMTC can be a service aimed at minimizing the power consumption of the terminal and the access of multiple terminals. URLLC can be a service oriented to high reliability and low latency. Depending on the type of service applied to the terminal, different requirements may apply.

[0047] As described above, a variety of services may be provided to users in a communication system, and in order to provide the users with the variety of services, a method and apparatus for providing various services within the same time interval is required.

[0048] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0049] When describing the embodiments of the present disclosure, descriptions related to technical contents that are well known in the art and not directly related to the present disclosure will be omitted. The omission of such unnecessary descriptions is intended to prevent the main idea of ​​the present disclosure from being obscured and to convey the main idea more clearly.

[0050] For the same reason, in the accompanying drawings, some elements may be enlarged, omitted or schematically shown. In addition, the size of each element does not fully reflect the actual size. In the accompanying drawings, the same or corresponding elements have the same reference numerals.

[0051] By referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the ways to achieve them will become clear. However, the present disclosure is not limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided only to fully disclose the present disclosure and inform those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the attached claims. Throughout the specification, the same or similar reference numerals represent the same or similar elements.

[0052] Here, it should be understood that each block in the flowchart illustration and the combination of blocks in the flowchart illustration can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a component for implementing the functions specified in one or more flowchart blocks. These computer program instructions can also be stored in a computer-usable or computer-readable memory, which can instruct the computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-usable or computer-readable memory produce an article including an instruction component, which implements the functions specified in one or more flowchart blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are performed on a computer or other programmable device, thereby generating a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more flowchart blocks.

[0053] In addition, each block of the flowchart diagram may represent a module, a code segment or a code portion, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions mentioned in the blocks may not occur in order. For example, depending on the functions involved, two blocks shown in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order.

[0054] "Unit" used herein refers to a software element or hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, "unit" does not always have the meaning that is limited to software or hardware. "Unit" can be constructed to be stored in an addressable storage medium or to execute one or more processors. Therefore, "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, processes, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and parameters. The elements and functions provided by "unit" can be combined into fewer elements or "units" or divided into more elements or "units". In addition, elements and "units" can be implemented as one or more CPUs in a reproduction device or a secure multimedia card. In addition, "unit" in an embodiment can include one or more processors.

[0055] Wireless communication systems have evolved into broadband wireless communication systems that provide high-speed and high-quality packet data services, such as communication standards such as 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, 802.16e of IEEE, etc., moving away from the early stage of providing only voice-oriented services. In addition, in conjunction with the 5G wireless communication system, communication standards for 5G or New Radio (NR) are being developed.

[0056] The NR system, which is a representative example of a broadband wireless communication system, adopts an orthogonal frequency division multiplexing (OFDM) scheme in the downlink (DL) and uplink. More specifically, a cyclic prefix OFDM (CP-OFDM) scheme is adopted in the DL, and a discrete Fourier transform spread OFDM (DFT-S-OFDM) scheme and a CP-OFDM scheme are adopted in the uplink. The uplink refers to a radio link through which a terminal (user equipment (UE)) or a mobile station (MS) sends data or a control signal to a base station (eNode or BS). The downlink refers to a radio link through which a base station sends data or a control signal to a terminal. In the multiple access scheme described above, time-frequency resources (on which data or control information will be transmitted to each user) are generally allocated and managed to meet orthogonality (i.e., do not overlap with each other) so as to distinguish data or control information for each user.

[0057] If a decoding failure occurs in the initial transmission, the NR system retransmits the corresponding data using a hybrid automatic repeat request (HARQ) scheme at the physical layer. The HARQ scheme is designed to operate in such a way that if the receiver fails to accurately decode the data, the receiver sends information indicating the decoding failure (i.e., a negative acknowledgement (NACK)), thereby enabling the transmitter to retransmit the corresponding data at the physical layer. The receiver can combine the data retransmitted from the transmitter with the previous data for which decoding failed, thereby improving data reception performance. In addition, if the receiver accurately decodes the data, the receiver sends information indicating that the decoding was successfully performed (ACK), thereby enabling the transmitter to send new data.

[0058] Figure 1 The basic structure of the time-frequency domain is shown, which is the radio resource domain for sending data or control channels in the downlink or uplink in the NR system.

[0059] refer to Figure 1 , the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The smallest transmission unit in the time domain is the OFDM symbol. symb OFDM symbols 102 configure one time slot 106. The length of a subframe is defined as 1.0 ms, and a radio frame 114 is defined as 10 ms. The minimum transmission unit in the frequency domain is a subcarrier, and the entire system transmission bandwidth includes a total of N BW There are 104 subcarriers.

[0060] The basic resource unit in the time-frequency domain is a resource element (RE) 112, which can be indicated by an OFDM symbol index and a subcarrier index. A resource block (RB) 108 {or a physical resource block (PRB)} can be composed of N consecutive subcarriers in the time domain. symb OFDM symbols 102 and N consecutive OFDM symbols in the frequency domain RBTherefore, one RB 108 may include N subcarriers 110. symb ×N RB 112. Generally, the minimum transmission unit of data is RB. NR system generally shows N symb =14 and N RB =12, and N BW and N RB It may be proportional to the bandwidth of the system transmission band. The data rate may increase in proportion to the number of RBs scheduled to the terminal.

[0061] In the NR system, in the case of an FDD system in which the downlink and uplink operate at separate frequencies, the downlink transmission bandwidth and the uplink transmission bandwidth may be different from each other. The channel bandwidth indicates the RF bandwidth corresponding to the system transmission bandwidth. Tables 1 and 2 show parts of the correspondence between the system transmission bandwidth, subcarrier spacing, and channel bandwidth defined in NR systems with frequency bandwidths below 6 GHz and frequency bandwidths above 6 GHz, respectively. For example, in an NR system with a 100 MHz channel bandwidth at a 30 kHz subcarrier spacing, the transmission bandwidth is configured by 273 RBs. In the following, N / A may be a combination of bandwidth and subcarrier, which is not supported by the NR system.

[0062]

Table 1

[0063]

[0064]

Table 2

[0065]

[0066] In the NR system, the frequency range can be divided and defined as FR1 and FR2.

[0067]

Table 3

[0068] Frequency range specification Corresponding frequency range FR1 450MHz-7125MHz FR2 24250MHz-52600MHz

[0069] In the above, the ranges of FR1 and FR2 can be variously changed and applied. For example, the frequency range of FR1 can be changed from 450 MHz to 6000 MHz and applied.

[0070] In the NR system, scheduling information for downlink data or uplink data can be sent from the base station to the terminal via downlink control information (DCI). DCI is defined according to various formats, and according to each format, DCI can indicate whether it is scheduling information for uplink data (UL grant) or scheduling information for downlink data (DL grant), 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, which is scheduling control information (DL grant) for downlink data, may include at least one of the following control information segments.

[0071] -Carrier indicator: Indicates the carrier frequency on which the transmission is performed.

[0072] -DCI format indicator: Indicates whether the corresponding DCI is for downlink or uplink.

[0073] - Bandwidth Part (BWP) indicator: Indicates the BWP in which the transmission is performed.

[0074] - Frequency domain resource allocation: Indicates RBs in the frequency domain, which are allocated for data transmission. Resources are determined according to the system bandwidth and the resource allocation scheme.

[0075] - Time domain resource allocation: Indicates the time slot in which the data-related channel will be transmitted and the OFDM symbol of the time slot.

[0076] - VRB-to-PRB mapping: indicates a mapping scheme by which a virtual RB (VRB) index is mapped to a physical RB (PRB) index.

[0077] - Modulation and Coding Scheme (MCS): Indicates the modulation scheme used for data transmission and the size of the transport block (which is the data to be sent).

[0078] -HARQ process number: indicates the HARQ process number.

[0079] - New data indicator: Indicates whether the HARQ transmission is an initial transmission or a retransmission.

[0080] - Redundancy version: indicates the redundancy version of HARQ.

[0081] - Transmit Power Control (TPC) Command for Physical Uplink Control Channel (PUCCH): Indicates the TPC command for PUCCH (used as uplink control channel).

[0082] In the case of data transmission through PUSCH, time domain resource allocation can be performed based on information about the time slot in which the PUSCH is transmitted, the starting symbol position S in the corresponding time slot, and the number of symbols to which the PUSCH is mapped L. In the above, S may be a relative position from the beginning of the time slot, L may be the number of consecutive symbols, and S and L may be determined based on a start and length indication indicator value (SLIV) defined as follows.

[0083] (L-1)≤7then

[0084] SLIV=14·(L-1)+S

[0085] otherwise

[0086] SLIV=14·(14-L+1)+(14-1-S)

[0087] In the NR system, the terminal may receive the SLIV value associated with a row, the PUSCH mapping type, and information about the time slot in which the PUSCH is sent through RRC configuration (for example, such information may be configured in the form of a table). Thereafter, for the time domain resource allocation of the DCI, the base station may send the SLIV value, the PUSCH mapping type, and information about the time slot in which the PUSCH is sent to the terminal by indicating the index value in the table configured as above.

[0088] In the NR system, the PUSCH mapping type is defined by type A and type B. In PUSCH mapping type A, the first symbol among the DMRS symbols is located at the second or third OFDM symbol in the slot. In PUSCH mapping type B, the first symbol among the DMRS symbols is located at the first OFDM symbol in the time domain resources allocated via PUSCH transmission.

[0089] The above-mentioned PUSCH resource mapping method can be applied to downlink data transmission through PDSCH in a similar manner. In the NR system, the PDSCH mapping type is defined by type A and type B, and in particular, in mapping type B, the first symbol among the DMRS symbols can be located in the first symbol of the PDSCH.

[0090] DCI may undergo a channel coding and modulation process and may then be transmitted via a physical downlink control channel (PDCCH), which is a downlink physical control channel. In the present disclosure, transmission of control information via PDCCH or PUCCH may be expressed as causing PDCCH or PUCCH to be transmitted. Similarly, transmission of data via PUSCH or PDSCH may be expressed as causing PUSCH or PDSCH to be transmitted.

[0091] Generally, DCI is scrambled with a specific radio network temporary identifier (RNTI) (or terminal identifier) ​​for each terminal independently, a cyclic redundancy flag (CRC) is added to the DCI, and channel coding is performed, thereby configuring and transmitting each independent PDCCH. The PDCCH is mapped and transmitted in a control resource set (CORESET) configured for the terminal.

[0092] Downlink data may be transmitted through a physical downlink shared channel (PDSCH) used as a physical channel for downlink data transmission. The PDSCH may be transmitted after a control channel transmission interval, and scheduling information in the frequency domain, such as a specific mapping position and modulation scheme, may be determined based on the DCI transmitted through the PDCCH.

[0093] By configuring the MCS in the control information of the DCI, the base station can inform the terminal of the modulation scheme applied to the PDSCH to be transmitted and the size of the data to be transmitted (transport block size (TBS)). In an embodiment, the MCS can be configured by 5 bits or more or less bits. Before the channel coding for error correction is applied to the data, the TBS corresponds to the size of the data (transport block, TB) to be transmitted by the base station.

[0094] In the present disclosure, a transport block (TB) may include a media access control (MAC) header, a MAC control element (CE), one or more MAC service data units (SDUs), and padding bits. Alternatively, a TB may indicate a unit of data (which is delivered from the MAC layer to the physical layer), or a MAC protocol data unit (PDU).

[0095] The modulation schemes supported by the NR system are quadrature phase shift keying (QPSK), 16-quadrature amplitude modulation (16QAM), 64QAM, and 256QAM. The modulation order (Q m ) correspond to 2, 4, 6 and 8 respectively. That is, 2 bits per symbol in the case of QPSK modulation, 4 bits per symbol in the case of 16QAM modulation, 6 bits per symbol in the case of 64QAM modulation, and 8 bits per symbol in the case of 256QAM modulation can be transmitted.

[0096] Figure 2 An aspect is shown in which data segments for eMBB, URLLC and mMTC (which are services considered in 5G or NR systems) are allocated in frequency-time resources, and Figure 3A An aspect is shown in which data segments for eMBB, URLLC, and mMTC (which are services considered in 5G or NR systems) are allocated in frequency-time resources.

[0097] refer to Figure 2 and Figure 3A , a scheme can be presented in which frequency and time resources are allocated for performing information transmission in each system.

[0098] first, Figure 2 Aspects of allocating data for eMBB, URLLC, and mMTC in the entire system frequency bandwidth 200 are shown. In the process of allocating and transmitting eMBB 201 and mMTC 209 in a specific frequency bandwidth, if URLLC data 203, 205, and 207 appear and therefore need to be transmitted, URLLC data 203, 205, and 207 can be transmitted without clearing or transmitting the portion in which eMBB 201 and mMTC 209 have been allocated. Since URLLC needs to reduce the delay time between services, URLLC data 203, 205, and 207 can be allocated to the portion of the resources allocated to eMBB 201, and thus can be transmitted. Of course, in the case of additionally allocating and transmitting URLLC in the resources allocated to eMBB, eMBB data may not be transmitted in the overlapping frequency-time resources, so the transmission performance of eMBB data may be reduced. That is, in the above case, eMBB data transmission failure due to URLLC allocation may occur.

[0099] exist Figure 3A In the present invention, the entire system frequency bandwidth 300 can be divided into subbands 302, 304 and 306 and used for transmission of services and data therein. Information associated with the subband configuration can be predetermined and sent by the base station to the terminal via higher layer signaling. Alternatively, the information associated with the subband can be divided in a predetermined manner by the base station or the network node, and services can be provided to the terminal without sending separate subband configuration information. Figure 3A Subband 302 is shown for transmission of eMBB data, subband 304 is shown for transmission of URLLC data, and subband 306 is shown for transmission of mMTC data.

[0100] Throughout the embodiments, the length of a transmission time interval (TTI) for URLLC transmission may be shorter than the length of a TTI for eMBB or mMTC transmission. In addition, a response to information related to URLLC may be sent faster than a response to information related to eMBB or mMTC, and thus, information transmission or reception with low latency is possible. The structures of the physical layer channels used for transmission of three types of services or data may be different from each other. For example, at least one of the length of the transmission time interval (TTI), the allocation unit of frequency resources, the structure of the control channel, and the data mapping method may be different.

[0101] In the above, three types of services and three types of 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.

[0102] In order to explain the methods and devices proposed in the embodiments, the terms "physical channel" and "signal" related to the NR system may be used. However, the details of the present disclosure may be applied to wireless communication systems other than the NR system.

[0103] In the following description of the present disclosure, when a known function or configuration may make the subject matter of the present disclosure less clear, a detailed description of the known function or configuration incorporated in this document will be omitted. The terms to be used below are terms defined in consideration of the functions in the present disclosure, and may differ according to the user, the user's intention or habit. Therefore, the definition of the terms should be based on the content of the entire specification. In the following, a base station is a subject for allocating resources to a terminal, and may be at least one of a gNode B (gNB), an eNode B (eNB), a node B, a base station (BS), a radio access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, a downlink (DL) refers to a radio transmission path for a signal sent by a base station to a terminal, and an uplink (UL) refers to a radio transmission path for a signal sent by a terminal to a base station. In addition, the NR system is used as an example to describe the embodiment below, but the embodiment may be applied to other communication systems with similar technical backgrounds or similar channel forms. Furthermore, the embodiments of the present disclosure may be modified without departing from the scope of the present disclosure and may be applied to other communication systems based on the determination of those skilled in the art.

[0104] In the present disclosure, the terms "physical channel" and "signal" in the prior art may be used interchangeably with "data" or "control signal." For example, PDSCH is a physical channel through which data is transmitted, but in the present disclosure, PDSCH may be referred to as data.

[0105] Hereinafter, in an embodiment, higher layer signaling is a method by which a base station sends a signal to a terminal by using a downlink data channel of a physical layer, or a method by which a terminal sends a signal to a base station by using an uplink data channel of a physical layer. Higher layer signaling may also be referred to as RRC signaling or MAC control element (CE).

[0106] The following embodiments provide a method and apparatus for sending or receiving data between a base station and a terminal or between terminals. Here, data can be sent from one terminal to multiple terminals, or data can be sent from one terminal to one terminal. Alternatively, data can be sent from a base station to multiple terminals. However, the present disclosure can be applied to various situations and is not limited thereto.

[0107] Figure 3B A process in which one transport block is divided into a plurality of code blocks and CRC is added to the plurality of code blocks according to an embodiment of the present disclosure is shown.

[0108] refer to Figure 3B , CRC 303 can be added to the last part or the first part of a transport block (TB) 301 to be sent in the uplink or downlink. CRC 303 can have 16 bits, 24 bits or a pre-fixed number of bits, or can have a variable number of bits depending on the channel conditions, and can be used to determine whether the channel coding is successful. TB 301 and the block to which CRC 303 is added can be divided into a plurality of code blocks (CB) 307, 309, 311 and 313 (indicated by reference numeral 305). Here, the divided code blocks can have a predetermined maximum size, and in this case, the size of the last code block 313 can be smaller than the size of other code blocks 307, 309 and 311. However, this is only an example, and according to another example, by inserting 0, a random value or 1 into the last code block 313, the length of the last code block 313 can be adjusted to be the same as the length of other code blocks 307, 309 and 311. CRCs 317, 319, 321, and 323 may be respectively added to the divided code blocks (indicated by reference numeral 315). The CRC may include 16 bits, 24 bits, or a pre-fixed number of bits, and may be used to determine whether channel coding is successful.

[0109] CRC 303 can be generated using TB 301 and a cyclic generator polynomial, and the cyclic generator polynomial can be defined in various ways. For example, if it is assumed that for TB data a 0 , a 1 , a 2 , a 3 , …, a A-1 For a 24-bit CRC and L=24, the cyclic generator polynomial gCRC24A(D)=D24+D23+D18+D17+D14+D11+D10+D7+D6+D5+D4+D3+D+1, then CRCp 0 , p 1 , p 2 , p 3 ,…,p L-1 You can do this by The value after dividing by gCRC24A(D) and the remainder becomes zero is determined as p 0 , p 1 , p 2 , p 3 , ..., p L-1 In the above example, as an example, it is assumed that the CRC length “L” is 24, but the CRC length “L” may be determined to have a different length, such as 12, 16, 24, 32, 30, 48, 64, etc.

[0110] Through this process, CRC is added to TB, and the TB to which CRC is added can be divided into N CBs 307, 309, ..., 311, and 313. CRC 317, 319, 321, and 323 can be added to each of the divided CBs 307, 309, ..., 311, and 313 (indicated by reference numeral 315). The length of the CRC added to the CB may be different from the length of the CRC added to the TB, or different cyclic generating polynomials may be used. However, depending on the type of channel code to be applied to the code block, the CRC 303 added to the TB and the CRC 317, 319, ..., 321, and 323 added to the code block can be omitted. For example, if an LDPC code other than a turbo code is applied to the code block, the CRC 317, 319, ..., 321, and 323 inserted for each code block can be omitted.

[0111] However, even if LDPC is applied, CRC 317, 319, ..., 321, and 323 may be added to the code block as it is. In addition, even if polar codes are used, CRC may be added or omitted.

[0112] As above Figure 3B As described above, the maximum length of one code block is determined according to the type of channel coding applied to a TB to be transmitted, and the TB and the CRC added to the TB are divided into code blocks according to the maximum length of the code block.

[0113] In a conventional LTE system, a CRC for a CB is added to a divided CB, data bits of the CB and the CRC are encoded with a channel code, thereby determining the coded bits, and the number of bits that have undergone a predetermined rate matching each of the coded bits can be determined.

[0114] The size of TB in the NR system can be calculated by the following operations.

[0115] Operation 1: Calculate N′ RE , which is the number of REs allocated for PDSCH mapping in one PRB in the allocated resources.

[0116] Here, you can Calculate N′RE .here, is 12, and It can indicate the number of OFDM symbols allocated to the PDSCH. It is the number of REs occupied by DMRS of the same CDM group in one PRB. is the number of REs occupied by overhead in one PRB, which is configured via higher layer signaling and can be configured as one of 0, 6, 12 or 18. Thereafter, the total number of REs allocated to PDSCH, N, can be calculated. RE . By min(156, N′ RE )·n PRB Calculate N RE , and n PRB Indicates the number of PRBs allocated to the terminal.

[0117] Operation 2: You can use N RE *R*Q m *v Calculate the number of temporary information bits N info Here, R is the bit rate, Q m is the modulation order, and the information of this value can be transmitted using the MCS bit field and table predefined in the control information. In addition, v is the number of allocated layers. info If ≤3824, TBS can be calculated by the following operation 3. Otherwise, TBS can be calculated by the following operation 4.

[0118] Step 3: You can use the equation and Calculate N′ info TBS can be determined as being equal to or greater than N' in Table 4a below info The value closest to N′ info The value of .

[0119]

Table 4a

[0120] index TBS index TBS index TBS index TBS 1 24 31 336 61 1288 91 3624 2 32 32 352 62 1320 92 3752 3 40 33 368 63 1352 93 3824 4 48 34 384 64 1416 5 56 35 408 65 1480 6 64 36 432 66 1544 7 72 37 456 67 1608 8 80 38 480 68 1672 9 88 39 504 69 1736 10 96 40 528 70 1800 11 104 41 552 71 1864 12 112 42 576 72 1928 13 120 43 608 73 2024 14 128 44 640 74 2088 15 136 45 672 75 2152 16 144 46 704 76 2216 17 152 47 736 77 2280 18 160 48 768 78 2408 19 168 49 808 79 2472 20 176 50 848 80 2536 21 184 51 888 81 2600 22 192 52 928 82 2664 23 208 53 984 83 2728 24 224 54 1032 84 2792 25 240 55 1064 85 2856 26 256 56 1128 86 2976 27 272 57 1160 87 3104 28 288 58 1192 88 3240 29 304 59 1224 89 3368 30 320 60 1256 90 3496

[0121] Operation 4: You can use the equation and Calculate N′ info . It can be obtained by N′ info The value of and the following [pseudo code 1] are used to determine TBS.

[0122] [Start pseudo code 1]

[0123]

[0124] [End pseudocode 1]

[0125] In an NR system, if a CB is input to an 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 vary depending on the LDPC basegraph. A method of sending all parity bits generated by LDPC encoding for a particular input may be referred to as full buffer rate matching (FBRM), and a method of limiting the number of parity bits that can be sent may be referred to as limited buffer rate matching (LBRM). If resources are allocated for data transmission, a circular buffer is used for the output of the LDPC encoder, and the bits of the buffer are repeatedly sent as many times as the number of allocated resources, and the length of the circular buffer may be referred to as N. cb If the number of parity bits generated by LDPC coding is N, then in the FBRM method, N cb Equal to N. In the LBRM method, N cb represents min(N, N ref ), N ref Depend on Given, and R LBRM can be determined as 2 / 3. In the above method for obtaining TBS, TBS LBRM Indicates the maximum number of layers supported by the terminal in the corresponding cell. In addition, in order to obtain TBS LBRM Regardless of whether the maximum modulation order is configured for the terminal in the corresponding cell, it is assumed that TBS LBRM is 64QAM, and the bit rate is assumed to be 948 / 1024, which is the maximum bit rate. Assuming N RE =156·n PRB , and we can assume that n PRB n PRB，LBRM , where n PRB，LBRM It can be given as shown in Table 4b below.

[0126]

Table 4b

[0127] Maximum number of PRBs on the BWP for all configured carriers <![CDATA[n PRB.LBRM ]]> Less than 33 32 33 to 66 66 67 to 107 107 108 to 135 135 136 to 162 162 163 to 217 217 Greater than 217 273

[0128] The maximum data rate supported by the terminal in the NR system can be determined by the following equation 1.

[0129] [Equation 1]

[0130]

[0131] In Equation 1, J may represent the number of carriers bound by carrier aggregation, Rmax=948 / 1024, The maximum number of layers that can be represented, It can represent the maximum modulation order, f (j) may represent a scaling index, and μ may represent a subcarrier spacing. The terminal may (j) Reported as a value between 1, 0.8, 0.75 and 0.4, and μ can be given as shown in Table 4c below.

[0132]

Table 4c

[0133] μ <![CDATA[Δf=2 μ ·15[kHz]]]> Cyclic prefix 0 15 ordinary 1 30 ordinary 2 60 Normal, Extended 3 120 ordinary 4 240 ordinary

[0134] also, is the average OFDM symbol length, can be calculated as and is the maximum number of RBs in BW(j). (j) is the cost value, and OH (j) It can be given as 0.14 in the downlink of FR1 (frequency band equal to or less than 6 GHz), 0.18 in the uplink of FR1, and 0.08 in the downlink of FR2 (frequency band higher than 6 GHz), 0.10 in the uplink of FR2. Through equation 1, the maximum data rate in the downlink in a cell with a frequency bandwidth of 100 MHz at a subcarrier spacing of 30 kHz can be calculated by the following Table 4d.

[0135]

Table 4d

[0136]

[0137] On the other hand, the actual data rate measurable by the terminal in actual data transmission may be a value obtained by dividing the amount of data by the data transmission time. This value may be obtained by dividing the TBS by the TTI length in 1 TB transmission, or by dividing the sum of the TBS by the TTI length in 2 TB transmission. For example, as shown in Table 4d, the maximum actual data rate in the downlink in a cell with a 100 MHz frequency bandwidth at a subcarrier spacing of 30 kHz may be determined according to the number of allocated PDSCH symbols, as shown in Table 4e below.

[0138]

Table 4e

[0139]

[0140] The maximum data rate supported by the terminal can be identified through Table 4d, and the actual data rate according to the allocated TBS can be identified through Table 4e. Here, depending on the scheduling information, the actual data rate may be greater than the maximum data rate.

[0141] In a wireless communication system, especially in a new radio (NR) system, a data rate that a terminal can support can be promised between a base station and a terminal. The data rate can 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 the value calculated based on the transport block size (TBS) and the TTI length of the transport block (TB) used for actual data transmission.

[0142] Therefore, a situation may occur where a TBS greater than a value corresponding to a data rate supported by the terminal itself is allocated to the terminal. To prevent this situation, the TBS that can be scheduled may be limited according to the data rate supported by the terminal.

[0143] Below, methods associated with channel state information (CSI) reference signals (RS) and reports (report or reporting) in LTE and LTE-Advanced (LTE-A) systems will be described. In addition to the above signals, in the LTE-A system, muting can be configured to allow terminals within the corresponding cell to receive CSI-RS sent by another base station without interference. Silence can be applied to locations where CSI-RS can be sent, and generally, terminals can receive traffic signals while skipping radio resources. In the LTE-A system, muting can be referred to as zero power (ZP) CSI-RS. Due to its characteristics, muting is applied to the position of CSI-RS because signal transmission occurs at this position with a transmission power of 0 or close to 0 power.

[0144] refer to Figure 4A, the RB can be divided into a control region 405 and a data region 406. The size of the time axis of the control region 405 can vary, and when the length of the control region 405 changes, the length of the data region 406 can also change. Reference numeral 400 indicates a resource region to which the CRS can be mapped, reference numeral 401 indicates a resource region to which the DMRS can be mapped, reference numeral 402 indicates a resource region to which the PDSCH can be mapped, and reference numeral 403 indicates a resource region to which the control channel can be mapped. Depending on the number of antenna ports used for CSI-RS transmission, the CSI-RS can be transmitted using a portion whose position 404 is indicated as A, B, C, D, E, F, G, H, I, and J. In addition, silence can be applied to a portion whose position is indicated as A, B, C, D, E, F, G, H, I, and J. In particular, depending on the number of configured antenna ports, 2, 4, or 8 REs can be used to transmit the CSI-RS. In the case of two antenna ports, in Figure 4A In the case of four antenna ports, half of the specific pattern is used for CSI-RS transmission; in the case of eight antenna ports, all of the specific pattern is used for CSI-RS transmission; and in the case of eight antenna ports, both patterns are used for CSI-RS transmission.

[0145] At the same time, silence is always performed in units of one pattern. That is, although silence is applied to multiple patterns, if the position of silence does not overlap with the position of CSI-RS, silence cannot be applied only to part of one pattern. However, silence can only be applied to part of one pattern only when the position of CSI-RS overlaps with the position of silence. In the case of transmitting CSI-RS for two antenna ports, the signals of each antenna port are transmitted through two REs connected on the time axis, and the signals of each antenna port are separated by orthogonal codes. In addition, in the case of transmitting CSI-RS for four antenna ports, in addition to the CSI-RS for two antenna ports, the signals for the remaining two antenna ports are transmitted in the same manner using two additional REs. In the case of transmitting CSI-RS for eight antenna ports, transmission can be performed in the same manner. In the case where CSI-RS supports 12 and 16 antenna ports, transmission is performed by combining three CSI-RS transmission positions for four existing antenna ports or by combining two CSI-RS transmission positions for eight antenna ports.

[0146] In addition, CSI-IM (or interference measurement resources (IMR)) and CSI-RS can be allocated to the terminal, and the CSI-IM resource has the same resource structure and position as the resource structure and position of the CSI-RS supporting 4 ports. CSI-IM is a resource for the terminal to receive data from one or more base stations to accurately measure the interference with the adjacent base station. For example, if it is desired to measure the amount of interference when the adjacent base station sends data and the amount of interference when the adjacent base station does not send data, the base station configures CSI-RS and two CSI-IM resources. By allowing the adjacent base station to always send a signal on one CSI-IM and allowing the adjacent base station to always not send a signal on other CSI-IMs, the base station can effectively measure the amount of interference caused by the adjacent base station.

[0147] Table 5a below shows the Radio Resource Control (RRC) fields forming the CSI-RS setting. This is to support periodic CSI-RS in the CSI process.

[0148]

Table 5a

[0149]

[0150] In the CSI process, four configuration types of channel state reports based on periodic CSI-RS are shown in Table 5a. First, "CSI-RS configuration" configures the frequency and time position of CSI-RS RE. Here, by configuring the number of antennas, the number of ports of the corresponding CSI-RS can be configured. "Resource configuration" configures the RE position in the RB, and "Subframe configuration" configures the subframe period and offset. The following Table 5b is used to configure the resource configuration and subframe configuration supported in LTE.

[0151]

Table 5b

[0152]

[0153]

[0154] Through the above Table 5b, the terminal can recognize the frequency and time position, period and offset. "Qcl-CRS-info" configures quasi co-location information for coordinated multi-point (CoMP).

[0155] Second, "CSI-IM configuration" configures the frequency and time position of the CSI-IM used to measure interference. Since "CSI-IM" is always configured based on four ports, there is no need to configure the number of antenna ports, and "resource configuration" and "subframe configuration" are configured in the same way as CSI-RS.

[0156] Third, "CQI reporting configuration" exists to configure the channel state report to be performed using the corresponding CSI process. The corresponding configuration may include periodic and aperiodic channel state report configuration, precoding matrix indicator (PMI) / rank indicator (RI) report configuration, RI reference CSI process configuration, subframe mode configuration, etc.

[0157] The subframe pattern configuration is used to support a measurement subframe subset for channel and interference measurement with different characteristics in time when measuring the channel and interference received by the terminal. In enhanced inter-cell interference coordination (eICIC), the measurement subframe subset was first introduced to estimate by reflecting the different interference characteristics between almost blank subframes (ABS) and non-ABS subframes. In enhanced interference mitigation and traffic adaptation (eIMTA), the measurement subframe subset has evolved to be able to measure different channel characteristics between subframes that always operate on DL and subframes that dynamically switch between DL and UL by setting two IMRs.

[0158] Table 5c and Table 5d below respectively represent measurement subframe subsets for supporting eICIC and eIMTA.

[0159]

Table 5c

[0160]

[0161]

Table 5d

[0162]

[0163] The measurement subframe subsets for eICIC supported in LTE are configured using csi-MeasSubframeSet1-r10 and csi-MeasSubframeSet2-r10. MeasSubframePattern-r10 referenced by the corresponding fields of csi-MeasSubframeSet1-r10 and csi-MeasSubframeSet2-r10 is shown in Table 5e below.

[0164]

Table 5e

[0165]

[0166] In this field, the left most significant bit (MSB) indicates subframe #0, and a bit value of 1 indicates that it is included in the corresponding measurement subframe subset. Unlike the eICIC measurement subframe subset that configures each subframe set via each field, the eIMTA measurement subframe subset uses one field to indicate the first subframe set with 0 and the second subframe set with 1. Therefore, in the case of eICIC, the corresponding subframe may not be included in both subframe sets, but in the case of the eIMTA subframe set, the corresponding subframe should always be included in one of the two subframe sets.

[0167] In addition, fourthly, there is a P signal indicating the power ratio between PDSCH and CSI-RS RE required for the terminal to generate a channel status report. C , and configure the codebook subset restriction to be used. C The and codebook subset restrictions are configured by the pC-AndCBSRList field (Table 5f), which includes two PC-AndCBSR fields in the form of a list of the following Table 5g, and each field represents the configuration of each subframe subset.

[0168]

Table 5f

[0169]

[0170]

Table 5g

[0171]

[0172] P C It can be defined as shown in Equation 2, with a value range of -8dB to 15dB.

[0173] [Equation 2]

[0174]

[0175] The base station can variably adjust the CSI-RS transmission power to enhance the channel estimation accuracy, etc., and the terminal can know the CSI-RS transmission power through the notified P C How low or high the transmission power used for data transmission is relative to the transmission power used for channel estimation. Therefore, even when the base station changes the CSI-RS transmission power, the terminal can calculate and report an accurate CQI to the base station.

[0176] Codebook subset restriction is a function that causes the base station not to report code points of the codebook supported by the standard to the terminal according to the number of CRS or CSI-RS ports of the base station. This codebook subset restriction can be configured by the codebookSubsetRestriction field in AntennaInfoDedicated included in the following table 5h.

[0177]

Table 5h

[0178]

[0179] The codebookSubsetRestriction field is configured with a bitmap, and the size of the bitmap is the same as the number of code points of the corresponding codebook. Therefore, each bitmap represents each code point. If the corresponding value is 1, the terminal may report the corresponding code point to the base station through the PMI. If the corresponding value is 0, the terminal may not report the corresponding code point to the base station through the PMI. For reference, the MSB indicates a high precoder index, and the least significant bit (LSB) indicates a low precoder index (e.g., 0).

[0180] In a cellular system, a base station needs to send a reference signal to a terminal in order to measure the downlink channel state. In the case of an LTE-A system, the terminal measures the channel state between the terminal and the base station by using a CRS or CSI-RS sent by the base station. In the channel state, some factors need to be basically considered, including the amount of interference in the downlink. The amount of interference in the downlink includes interference signals and thermal noise that occur due to antennas belonging to adjacent base stations, and is important for the terminal to determine the channel conditions in the downlink. For example, if a base station with one transmitting antenna sends a signal to a terminal with one receiving antenna, the terminal must use the reference signal received from the base station to determine the energy per symbol that may be received in the downlink and the amount of interference to be received at the same time in the period in which the corresponding symbol is received, and determine Es / Io (the energy ratio of the symbol to the amount of interference). The determined Es / Io is converted into a data transmission speed or a corresponding value, and the data transmission speed or the corresponding value is notified to the base station in the form of a channel quality indicator (CQI). Therefore, the base station can determine the transmission speed at which the base station performs transmission to the terminal.

[0181] In the case of LTE-A systems, the terminal feeds back information about the channel state of the downlink to the base station so that the base station can use the information for DL ​​scheduling. That is, the terminal measures the reference signal sent by the base station via DL, and feeds back the information extracted from the reference signal to the base station in the form defined in the LTE and LTE-A standards. In LTE and LTE-A systems, the information fed back by the terminal basically includes the following three types.

[0182] - Rank Indicator (RI): The number of spatial layers that the terminal can receive under the current channel state.

[0183] - Precoding Matrix Indicator (PMI): An indicator associated with the precoding matrix desired by the terminal under the current channel state.

[0184] - Channel Quality Indicator (CQI): The maximum data rate at which a terminal can perform reception under the current channel state. CQI can be replaced by SINR, maximum error correction code rate and modulation scheme, or data efficiency per frequency (which can be similarly used as the maximum data rate).

[0185] RI, PMI and CQI have interrelated meanings. For example, the precoding matrices supported in LTE and LTE-A systems are defined differently for each rank. Therefore, although the PMI value when the RI value is 1 and the RI value is 2 is the same, it is interpreted differently. In addition, when the terminal determines the CQI, the terminal determines the CQI under the assumption that the rank value and PMI value that the terminal has notified the base station have been applied to the base station. That is, if the terminal has notified the base station of RI_X, PMI_Y and CQI_Z, when the rank is RI_X and the applied precoding matrix is ​​PMI_Y, this means that the terminal can receive data at a data rate corresponding to CQI_Z. As described above, when calculating the CQI, the terminal assumes a transmission scheme to be performed for the base station so that optimized performance can be obtained when actual transmission is performed using the corresponding transmission scheme.

[0186] In LTE and LTE-A, the periodic feedback of the terminal is configured as one of the following feedback modes or reporting modes.

[0187] - Reporting mode 1-0 (wideband CQI without PMI): RI, broadband (wideband, which can be used interchangeably with full band) CQI (wCQI)

[0188] - Reporting mode 1-1 (wideband CQI with single PMI): RI, wCQI, PMI

[0189] - Reporting mode 2-0 (subband CQI without PMI): RI, wCQI, narrowband (which can be used interchangeably with subband) CQI (sCQI)

[0190] - Reporting mode 2-1 (subband CQI with single PMI): RI, wCQI, sCQI, PMI

[0191] The feedback timing of each piece of information in the four feedback modes is determined by N sent via a higher layer signal. pd 、N OFFSET，CQI 、M RI 、N OFFSET，RI In feedback mode 1-0, the transmission period of wCQI is Npd , and the feedback timing is determined by N OFFSET，CQI In addition, the transmission period of RI is N pd *M RI , and the offset is N OFFSET，CQI +N OFFSET，RI .

[0192] Feedback mode 1-1 has the same feedback timing as feedback mode 1-0, but differs in that the wCQI and the PMI are transmitted together at the wCQI transmission timing.

[0193] In feedback mode 2-0, the feedback cycle of sCQI is N pd , and the offset value is N OFFSET，CQI The feedback cycle of wCQI is H·N pd , and the offset value is N as the offset value of sCQI OFFSET，CQI Here, H=J*K+1, where K is transmitted via a higher layer signal, and J is a value determined by the system bandwidth.

[0194] For example, the J value of a 10 MHz system is defined as "3". As a result, wCQI is sent by replacing the value of J every H sCCI transmissions. The period of RI is M RI *H*N pd , and its offset is N OFFSET，CQI +N OFFSET，RI .

[0195] Feedback mode 2-1 has the same feedback timing as feedback mode 2-0, but differs in that PMI is transmitted together at the wCQI transmission timing.

[0196] The above feedback timing corresponds to the number of CSI-RS antenna ports of 4 or less. When the terminal is allocated CSI-RS for 8 antenna ports, two pieces of PMI information should be fed back, which is different from the above feedback timing. For 8 CSI-RS antenna ports, feedback mode 1-1 is further divided into two sub-modes. In the first sub-mode, RI is sent together with the first PMI information, and the second PMI information is sent together with wCQI.

[0197] Here, the feedback period and offset of wCQI and the second PMI are defined as N pd and N OFFSET，CQI , and the feedback period and offset value of the RI and first PMI information are defined as M RI *N pd and N OFFSET，CQI +N OFFSET，RIIf the precoding matrix corresponding to the first PMI is W1, and the precoding matrix corresponding to the second PMI is W2, the terminal and the base station share information that the precoding matrix desired by the terminal is determined to be W1W2.

[0198] In the case of feedback mode 2-1 for 8 CSI-RS antenna ports, feedback of precoding type indicator (PTI) information is added. PTI is fed back with RI, and the period of PTI is M RI *H*N pd , and its offset is defined as N OFFSET，CQI +N OFFSET，RI If PTI is 0, the first PMI, the second PMI and wCQI are all fed back, wCQI and the second PMI are sent at the same timing, and the period of PTI is N pd , and its offset is given as N OFFSET，CQI .

[0199] In addition, the period of the first PMI is H'*Npd, and its offset is N OFFSET，CQI Here, H' is sent via a higher layer signal. However, when PTI is "1", PTI is sent together with RI, wCQI is sent together with the second PMI, and sCQI is fed back at a separate timing. Here, the first PMI is not sent. The period and offset of PTI and RI are the same as when PTI is "0", and the period of sCQI is defined as N pd , and its offset is defined as N OFFSET，CQI wCQI and the second PMI have a period of H*N pd and offset N OFFSET，CQI is fed back when , and H is defined as the case where the number of CSI-RS antenna ports is "4".

[0200] LTE and LTE-A systems support periodic feedback to terminals and aperiodic feedback to terminals. When the base station expects to obtain aperiodic feedback information of a specific terminal, the base station configures the uplink data scheduling of the corresponding terminal to include an aperiodic feedback indicator in the downlink control information (DCI) to instruct specific aperiodic feedback, thereby performing uplink data scheduling of the corresponding terminal. When the corresponding terminal receives an indicator configured to perform aperiodic feedback in the nth subframe, the corresponding terminal performs uplink transmission by including aperiodic feedback information in the uplink data transmission in the (n+k)th subframe, where k is a parameter defined in the 3GPP LTE version 11 standard, which is "4" in frequency division duplex (FDD) and is defined as shown in the following Table 5i in time division duplex (TDD).

[0201]

Table 5i

[0202]

[0203] When setting aperiodic feedback, the feedback information includes RI, PMI and CQI. Just like when setting periodic feedback, RI and PMI may not be fed back according to the feedback setting. CQI may include both wCQI and sCQI, or only wCQI information.

[0204] In addition, LTE and LTE-A systems provide a codebook subsampling function for periodic CSI reporting. In LTE and LTE-A systems, the periodic feedback of the terminal is sent to the base station via PUCCH, and the amount of information that can be sent at one time through PUCCH is limited. Therefore, various feedback objects such as RI, wCQI, sCQI, PMI1, wPMI2 and sPMI2 can be sent on PUCCH through subsampling, or two or more feedback information can be jointly encoded and sent on PUCCH.

[0205] For example, when the base station is configured with 8 CSI-RS ports, the RI and PMI1 reported in sub-mode 1 of PUCCH mode 1-1 can be jointly encoded, as shown in Table 5j below. Based on Table 5j, RI including 3 bits and PMI1 including 4 bits are jointly encoded as a total of 5 bits. In sub-mode 2 of PUCCH mode 1-1, PMI1 including 4 bits and PMI2 including other 4 bits are jointly encoded as a total of 4 bits, as shown in Table 5k below. Since the subsampling level is higher than that of sub-mode 1 (sub-mode 1 undergoes subsampling from 4 cases to 3 cases, and sub-mode 2 undergoes subsampling from 8 cases to -4 cases), more precoding indexes cannot be reported.

[0206] As another example, when the base station is configured with 8 CSI-RS ports, the PMI2 reported in PUCCH mode 2-1 can be subsampled, as shown in Table 5l below. Referring to Table 5l, when the number of associated RIs is "1", PMI2 is reported as 4 bits. However, if the number of associated RIs is "2" or greater, the differential CQI of the second codeword should be reported together, so PMI2 is subsampled and reported as 2 bits. In LTE and LTE-A, subsampling or joint coding can be applied to a total of 6 types of periodic feedback, including those in Table 5i, Table 5k, and Table 5l.

[0207]

Table 5j

[0208] <![CDATA[value of joint encoding of RI and the first PMI I Rt / PMI1 ]]> RI <![CDATA[Codebook index i 1 ]]> 0-7 1 <![CDATA[2I RI / PMI1 ]]> 8-15 2 <![CDATA[2(I RI / PMI1 -8)]]> 16-17 3 <![CDATA[2(I RI / PMI1 -16)]]> 18-19 4 <![CDATA[2(I RI / PMI1 -18)]]> 20-21 5 <![CDATA[2(I RI / PMI1 -20)]]> 22-23 6 <![CDATA[2(I RI / PMI1 -22)]]> 24-25 7 <![CDATA[2(I RI / PMI1 -24)]]> 26 8 0 27-31 reserved NA

[0209]

Table 5k

[0210]

[0211]

Table 5l

[0212]

[0213] Figure 4B It shows the situation in which various services in the NR system are multiplexed in time and frequency resources. The base station can allocate CSI-RS to the full-band or multi-band in order to guarantee the initial channel state information to the terminal, as shown in the figure mark 415. The full-band or multi-band CSI-RS uses a large amount of reference signal overhead, which is not conducive to optimizing system performance. However, if there is no pre-acquired information, CSI-RS transmission in the full-band or multi-band may be necessary. After the CSI-RS transmission in the full-band or multi-band, different requirements for each service can be provided for each service, so the accuracy and update requirements of the channel state information may also change. Therefore, after obtaining the initial channel state information, the base station can trigger the transmission of sub-band CSI-RS 410, 420, 430 and 440 for each service in the corresponding frequency band according to the needs of each service. Although Figure 4B CSI-RS transmission for each service at one point in time is shown, but CSI-RS transmission for a plurality of services is possible as needed.

[0214] As described in Table 5a and Table 5b, the LTE system supports periodic CSI-RS transmission. Periodic CSI-RS enables the terminal to periodically measure resources and perform periodic CSI reporting by using the measured resources. However, this periodic CSI-RS transmission is not advantageous in supporting terminals of existing LTE and future systems. For example, when the CSI-RS pattern of the above-mentioned LTE system is different from the CSI-RS pattern of the NR system, ZP CSI-RS resources may be additionally required to perform rate matching for the corresponding resources. In addition, if the CSI-RS pattern supported later in the NR system is different from the existing CSI-RS, the existing NR terminals and future NR terminals need to support and use different CSI-RS patterns, respectively. Here, periodic CSI-RS RS may further increase the overhead. Taking the above into account, the following non-periodic CSI-RS transmission method can be considered.

[0215] -Aperiodic CSI-RS resource configuration and triggering method 1: Method 1 is a method of pre-configuring multiple aperiodic CSI-RS resources and triggering some of the configured resources.

[0216] -Aperiodic CSI-RS resource configuration and triggering method 2: Method 2 is a method of pre-configuring multiple aperiodic CSI-RS resources, activating some of the configured resources, and triggering some of the activated resources.

[0217] -Aperiodic CSI-RS resource configuration and triggering method 3: Method 3 is a method of pre-configuring multiple aperiodic CSI-RS resources and periodically sending CSI-RS through corresponding CSI-RS resources according to the activation status until the resources are deactivated.

[0218] Non-periodic CSI-RS resource configuration and triggering method 1 is a method of pre-configuring multiple non-periodic CSI-RS resources and triggering some of the configured resources. According to this method, since multiple resources need to be always dynamically configured and the number of all configurations needs to be supported, the complexity of the terminal may be relatively high. Method 2 is a method that only supports dynamic transmission of some of the configured resources. Here, since the number of CSI-RS resources that can be sent is relatively small, the complexity of the terminal is less than that in method 1, and dynamic CSI-RS transmission is also possible. According to method 3, multiple resources are configured, and all or some of the resources are periodically sent using the concept of semi-persistent scheduling (SPS). According to method 3, the hardware changes and complexity increase of the terminal may be significantly less than methods 1 and 2.

[0219] In the case of supporting non-periodic CSI-RS transmission, DCI or MAC control element (CE) signal can be used to send and configure the corresponding activation or deactivation operation and trigger operation. When supporting the above method, it is also considered to support multiple CSI-RS transmission methods. Here, the CSI-RS transmission in the non-periodic CSI-RS resource configuration and triggering method 3 can be referred to as semi-persistent (periodic) CSI-RS transmission, rather than non-periodic CSI-RS transmission.

[0220] In addition to the CSI-RS transmission mentioned above, the NR system also supports non-periodic, periodic and semi-persistent channel state information. Here, the periodic channel state information of the NR system may not support the subband report in the above feedback mode. The report used in the periodic channel state report can send a limited number of reports. Therefore, as mentioned above, in the LTE system, the terminal can select some subbands of the bandwidth part to report the channel state information. However, since the report through the selective subband carries very limited information, the utility of the information is not great. Therefore, such reports are not supported, thereby reducing the complexity of the terminal and improving the efficiency of the report. In addition, since subband reporting is not supported, no PMI may be reported or only one PMI corresponding to the broadband or partial frequency band may be sent through the periodic channel state information report of the NR system.

[0221] The aperiodic channel state information reporting of the NR system supports the following reporting modes.

[0222] - Reporting mode 1-2 (wideband CQI with multiple PMIs): RI, wideband CQI (wCQI), multiple wideband and subband PMIs

[0223] - Reporting mode 2-0 (subband CQI without PMI): RI, wCQI, subband CQI (sCQI) of the band selected by the terminal

[0224] - Reporting mode 2-2 (subband CQI with multiple PMIs): RI, wCQI, sCQI, multiple wideband and subband PMIs

[0225] - Reporting mode 3-0 (subband CQI without PMI): RI, wCQI, subband CQI (sCQI) of the entire band

[0226] - Reporting mode 3-2 (subband CQI with multiple PMIs): RI, wCQI, subband CQI for the full band, and multiple wideband and subband PMIs

[0227] Similar to the periodic channel status report described above, reporting modes 2-0 and 2-2 are types in which one of the subbands in the bandwidth portion of the terminal is selected for reporting, and may not be supported in the NR system due to its low efficiency. In the periodic channel status report in the LTE system, the reporting mode is determined using the PMI / RI reporting configuration and CQI configuration of the corresponding channel status reporting mode configuration. However, in the non-periodic channel status report, the channel status reporting mode is directly configured. In the NR system, the channel status reporting configuration can be provided via the PMI / RI reporting configuration, the CQI reporting configuration, etc.

[0228] Table 5m below shows CSI reporting settings, reference signal (RS) settings, and CSI measurement settings for channel status reporting. Figure 4C The relationship between CSI report setting, RS setting and CSI measurement setting is shown.

[0229]

Table 5m

[0230]

[0231] The reference signal settings, CSI report settings, and CSI measurement settings in Table 5m may include the following settings.

[0232] - Reference signal settings: reference signal transmission type (periodic, aperiodic, semi-persistent), reference signal transmission period and offset

[0233] -CSI report settings: whether to perform reporting of RI, PMI, CQI, beam index (BI) or CSI-RS resource index (CRI) (which can be configured individually or in combination), reporting method (periodic, aperiodic, semi-persistent or aperiodic and semi-persistent reporting can be configured as one parameter), codebook configuration information, PMI form (full band (wideband) or / and partial band (subband)), channel status report type (implicit or / and explicit, or type I / type II), channel quality report type (CQI or / and RSRP), and resource configuration for channel status reporting.

[0234] - Channel measurement settings (CSI measurement settings): settings regarding reference signal settings and channel status report settings for reporting, and settings regarding the association between reference signal settings and reporting time points (e.g., when a reference signal is transmitted in the nth subframe or slot, the reporting time point may use parameters (such as D 0-0 , D 1-0 , D 2-1 , D 3-2 and D 3-3 ) to configure, and can therefore be defined as n+D 0-0 ).

[0235] In each of the above settings, Figure 4C As shown, multiple settings can be configured for the terminal, wherein the CSI report setting and the RS setting can be freely and flexibly connected through the CSI measurement setting, and the CSI report setting and the RS setting can be indicated to the terminal.

[0236] In the NR system, two types of channel status reports with low spatial resolution and high spatial resolution are supported as shown below. The following Table 5n shows these two types of channel status reports.

[0237]

Table 5n

[0238]

[0239]

[0240] As described above, as in the existing LTE system, the type I channel state report is based on the codebook, and the channel state is reported to the base station through RI, PMI, CQI and CRI. On the other hand, the type II report can provide a higher level of resolution by using a larger PMI report overhead for implicit CSI similar to the type I report, and the PMI report can be performed by a linear combination of the precoder, beam, co-phase, etc. used for the type I report. In addition, in order to report the direct channel state, CSI can be reported in an explicit CSI form different from the existing form, and a representative example thereof is a method of reporting the covariance matrix of the channel. In addition, a combination of implicit information and explicit information is also possible. For example, the covariance matrix of the channel is reported via PMI, and CQI or RI can also be reported in addition.

[0241] As described above, Type II channel status reports require high reporting overhead. Therefore, such reports may not be suitable for periodic channel status reports that do not have a large number of bits for reporting. However, since aperiodic channel status reports are supported through PUSCH, which can support a large overhead, only Type II reports that require high reporting overhead can be supported in aperiodic channel status reports.

[0242] In addition, Type II reports can be supported in semi-persistent channel status reports. In NR systems, semi-persistent channel status reports support dynamic activation and deactivation compared to periodic channel status reports, requiring relatively high terminal complexity. Therefore, periodic channel status reports can be performed using transmission methods such as PUCCH formats 1, 2, and 3, which have relatively low complexity and high coverage compared to existing LTE systems. Table 5o shows the resource configuration for PUCCH format 3 in the LYE system.

[0243]

Table 5o

[0244]

[0245] On the other hand, a terminal with high terminal complexity can support semi-persistent channel status reporting, and the terminal can support the transmission of a large amount of data through transmission based on the existing PUCCH format 4 or 5. PUCCH formats 4 and 5 use tail-biting convolutional coding (TBCC) and QPSK modulation. In the case of format 5, the data is divided and sent to two terminals through an orthogonal sequence. Therefore, in one RB transmission, 144 REs and a coding rate of 1 / 3 are used to perform the transmission, so according to PUCCH formats 4 and 5, up to 96 bits (based on the configuration of one RB) and up to 48 bits can be sent, respectively. In addition, in format 4, multiple RBs can be configured, so as many bits as the number of RBs multiplied by 96 bits can be sent. Table 5p below shows the resource configuration for PUCCH formats 4 and 5.

[0246]

Table 5p

[0247]

[0248] Therefore, the semi-persistent channel state report can support a channel state report with a relatively larger number than the periodic channel state report. Therefore, the type II channel state report requiring a large number of reports is not periodically supported in the periodic channel state report, but the type II channel state report requiring a large number of reports can be supported in the aperiodic channel state report and the semi-persistent channel state report.

[0249] In addition, PMI and CQI reports for each subband that are not supported in periodic channel status reports can be supported in semi-persistent channel status reports and aperiodic channel status reports. As described above, since semi-persistent channel status reports and aperiodic channel status reports can support a relatively large number of channel status reports, the efficiency of channel status reports can be improved by sending as many channel status reports as possible to the base station, and the overall system performance can be improved by providing the information required for scheduling and precoding of each subband of the base station.

[0250] As described above, in the case of periodic channel status reporting, it is necessary to minimize reporting complexity and overhead in order to minimize complexity and resource usage when supporting reporting. Based on the flexible operation of reporting, semi-persistent channel status reporting can support more complex operations. To this end, a short duration PUCCH (hereinafter referred to as short PUCCH) can be used in periodic channel status reporting, and a long duration PUCCH (hereinafter referred to as long PUCCH) can be used in semi-persistent channel status reporting.

[0251] Long PUCCH can be sent through at least three OFDM symbols and up to 14 OFDM symbols in a time slot, and can also be sent via the aggregation of multiple time slots. One purpose of long PUCCH is to send a large amount of information at one time. In order to send a large amount of information, long PUCCH can be sent through up to 14 OFDM symbols in a time slot, thereby ensuring a large amount of resources on the time axis. In addition, additional time slots can also be aggregated. In addition, a large number of PRBs on the frequency axis can be used to send long PUCCH, and a large amount of frequency resources can be added for the transmission of long PUCCH. Long PUCCH enables the terminal to send a large amount of information to the base station at one time through a relatively large amount of time and frequency resources.

[0252] Another purpose of the long PUCCH is to enable the terminal to ensure the coverage required for sending uplink control information (UCI). Unlike the base station, the terminal performs transmission at a lower power than the base station due to space, battery and other reasons. In addition, unlike the downlink pre-planned by pre-cell planning, the interfering terminal can change dynamically according to the distribution and use of users in the uplink. In the worst case, the terminal may suffer severe interference from neighboring terminals during signal transmission. Therefore, the terminal experiences a low signal to interference plus noise ratio (SINR). Here, the additional allocation of frequency resources reduces the energy per bit of the signal sent by the terminal. Therefore, in order to ensure the coverage of the signal sent by the terminal, the same information is sent via multiple time resources, thereby maintaining the energy per bit and increasing the total transmission power of the signal. Therefore, the same signal is repeatedly sent via multiple allocated time resources, so that the terminal can ensure the coverage of the uplink signal. In addition, the long PUCCH supports the transmission of DFT-S OFDM waveforms based on low peak-to-average power ratio (PAPR) characteristics, thereby enhancing the uplink transmission efficiency of the terminal.

[0253] Compared with the long PUCCH, the short PUCCH can efficiently transmit a small amount of information by using a small amount of resources. To this end, the short PUCCH can transmit UCI via a small number of OFDM symbols (e.g., one or two OFDM symbols) and is based on the CP-OFDM waveform for efficient data transmission. Short PUCCH transmission can be efficiently performed using CP-OFDM and a small number of OFDM symbols, and is possible for terminals with relatively good uplink channel states. However, when the quality of the uplink channel is not good enough because the terminal is located at the cell boundary or there are adjacent terminals that simultaneously support uplink transmission, short PUCCH transmission may not be supported.

[0254] Even in the short PUCCH structure, different methods can be supported to multiplex reference signals and transmission data depending on the number of OFDM symbols used for transmission. For example, in transmission based on one symbol, multiplexing using frequency resources can be configured for data and reference signals. In transmission based on two symbols, by using the characteristics of the corresponding resources, multiplexing using time resources can be considered for data and reference signals in addition to frequency resources. The following Tables 5q and 5r show resource multiplexing options according to the number of OFDM symbols transmitted by the short PUCCH. Table 5q shows resource multiplexing options based on one OFDM symbol, and Table 5r shows resource multiplexing options based on two OFDM symbols.

[0255]

Table 5q

[0256]

[0257]

Table 5r

[0258]

[0259] In the channel state report in the LTE system, as mentioned in Table 5a, the base station sets the reference signal and report related configuration for the terminal based on the CSI process through a higher layer configuration. Based on this, in the periodic channel state report, the channel state information is reported at the preset reporting time point using the preset resources. In the aperiodic channel state report, the preset configuration information is reported through the trigger in the DCI sent by the base station through the downlink control signal.

[0260] As described above, in the semi-persistent channel state report, when activation by DCI is supported, low-latency activation and deactivation can be supported. However, the terminal may not receive the DCI or may receive the wrong DCI, so it may perform a channel state information report according to the wrong time point and the wrong configuration. In addition, in the case of activation by MAC CE, due to the support for ARQ, erroneous reception is unlikely to occur, but the delay is not favorable compared to higher layer signaling (such as RRC signaling). Therefore, in order to overcome the shortcomings of DCI-based activation and deactivation and MAC CE-based activation and deactivation, MAC CE-based activation and deactivation and DCI-based activation and deactivation can be used in combination. For example, the channel report setting, RS setting and channel measurement setting in Table 5m are set for the terminal by K (K≥1) higher layers, and N (N≥1) of the K report settings set are set by MAC CE as candidate resources that the base station can activate for the terminal.

[0261] Figure 5AAn example of candidate activation through MAC CE and subsequent activation of basic semi-persistent channel state reporting via DCI is shown.

[0262] like Figure 5A As shown, the base station sets some (N) of the report settings as activation candidate resources (indicated by reference numeral 500) through MAC CE. Then, the base station can activate M (M≥1) resources among the N semi-persistent report candidate resources by sending DCI by the base station to enable the terminal to perform reporting (indicated by reference numeral 510). Here, X or Y time slots, subframes or mini-slots (indicated by reference numerals 502 and 532) may be required until the base station is allowed to activate (indicated by reference numeral 510) and deactivate (indicated by reference numeral 520) the report candidate resources for the terminal through DCI after the resources are activated via MAC CE. Here, although different activation and deactivation signals of the candidate settings are shown, the activation and deactivation signals of the candidate settings can be configured using the same bitmap. For example, 0 can indicate deactivation of the corresponding candidate, and 1 can indicate activation. In addition, the candidate resources for semi-persistent reporting can be used together with the candidate resources for aperiodic channel state reporting.

[0263] Furthermore, activation and deactivation of MAC CE-based candidate settings may be equally applied to semi-persistent CSI-RS.

[0264] When the RS setting, channel status report setting, and channel measurement setting in Table 5n are used to perform semi-persistent channel status report setting and activation, in the case of reference signal setting and channel status report setting, information configured by the base station via a higher layer can be used, and the base station can send the channel measurement setting to the terminal through DCI. Here, the base station can flexibly change the measurement setting in the semi-persistent channel status report setting that supports flexible activation and deactivation of the channel status report, thereby efficiently operating the reporting resources.

[0265] As described above, aperiodic channel state reports and semi-persistent channel state reports share a large number of characteristics, such as type II channel state reports and channel state reports for subbands. Therefore, when the trigger for aperiodic channel state reports and the downlink control signal for activating semi-persistent channel state reports are provided separately, various overheads for supporting different DCI formats, the amount of information for triggering and activation, time and frequency resources for uplink transmission, etc. are required for reporting. Therefore, the bits for triggering aperiodic channel state reports and for activating semi-persistent channel state reports can be shared (i.e., the same information is used to perform the triggering of aperiodic channel state reports and the activation of semi-persistent channel state reports), thereby minimizing the use of DCI formats, the amount of information, and frequency and time resources, and achieving efficient operation. For example, in an LTE system, for CSI processes and cells, a bit of 1 or 0 is used to indicate whether the corresponding CSI process or cell is triggered for aperiodic channel state reports. The above information can also be used in the NR system to support the triggering or activation of aperiodic or semi-persistent channel state reporting for the above CSI measurement settings or CSI processes supported by the NR system. In addition, X and Y can be the same period.

[0266] In resource allocation, the reporting type indication using DCI can be supported. For example, 0 can indicate a non-periodic channel state report, and 1 can indicate a semi-persistent channel state report. Here, when the base station indicates "0" together with the channel state measurement information, the terminal can determine that the non-periodic channel state report is triggered and reports the channel state information via only one time resource. When the base station indicates "1", the terminal can determine that the semi-persistent channel state report is activated or deactivated, and reports the channel state information via multiple time resources.

[0267] As a resource allocation method for the above-mentioned semi-persistent channel status reporting, the following method may be used.

[0268] - Resource allocation method 1 for semi-persistent channel status reporting: A method for configuring resources for semi-persistent channel status reporting via a higher layer

[0269] - Resource allocation method 2 for semi-persistent channel status reporting: A method for dynamically configuring resources for semi-persistent channel status reporting through DCI or MAC CE

[0270] Resource allocation method 1 for semi-persistent channel state reporting is a method of configuring resources via a higher layer. For semi-persistent channel state reporting, the channel report setting via a higher layer can be pre-configured as in the PUCCH resource setting (0 to 1184) in Table 5o. When triggering, activating and deactivating aperiodic channel state reporting and semi-persistent channel state reporting based on a DCI, if the semi-persistent channel state reporting uses resource allocation method 1, and the resource allocation for the aperiodic channel state reporting is sent via DCI or MAC CE, the terminal may not need to use the resource allocation information sent by DCI or MAC CE. Therefore, in this case, the corresponding resource allocation bit can be used as a method to distinguish between aperiodic channel state reporting and semi-persistent channel state reporting. For example, when there are no resources allocated by the corresponding resource allocation information, aperiodic channel state reporting may not be supported. Therefore, when resources are not allocated (for example, all bits of the resource allocation information are "0") and an indication of the information is sent to the terminal, the terminal determines that the indication is a trigger for a semi-persistent channel state report and uses the indication.

[0271] In accordance with Figure 5B In another method, when the base station indicates the triggering of a semi-persistent channel status report by using an independent indication bit through DCI in the above situation (indicated by reference numeral 540), the terminal can perform non-periodic channel status reporting based on the resource allocation information bit at the initial transmission time point of the initial semi-persistent channel status report or at the non-periodic channel status reporting time point through DCI (indicated by reference numeral 545), and can perform semi-persistent channel status reporting at the remaining reporting time points of the semi-persistent channel status report (indicated by reference numeral 550) through resources pre-configured via a higher layer.

[0272] Figure 5B An example of the operation of a terminal that reports a non-periodic channel state in an initial report of a semi-persistent channel state report is shown. Such a non-periodic channel state report enables the base station to identify whether the terminal has correctly received the corresponding semi-persistent channel state report activation or deactivation signal, thereby ensuring the reliability of the indication through the DCI.

[0273] Here, the base station may use the method mentioned in the following resource allocation method 2 to allocate resources for the non-periodic channel status report.

[0274] Resource allocation method 2 is a method of configuring resources through DCI or MAC CE, which sends a corresponding report to the terminal to configure the resources. Here, the resource transmission unit definition method may include the following method.

[0275] - Resource allocation unit definition method for semi-persistent channel status reporting 1: A method of allocating reporting resources to specific RBGs and transmitting channel status information via the specific RBGs

[0276] - Resource allocation unit definition method 2 for semi-persistent channel status reporting: A method of allocating reporting resources to specific non-contiguous RBs and transmitting channel status information via specific RBGs

[0277] - Resource allocation unit definition method 3 for semi-persistent channel status reporting: A method of allocating reporting resources to specific consecutive RBs and transmitting channel status information via specific RBGs

[0278] Resource allocation unit definition method 1 is a method of allocating a semi-persistent channel status report to a specific RBG and transmitting the report via the RBG. In the channel status report, the size of the RBG may vary depending on the system bandwidth supported by the system.

[0279] When the semi-persistent channel status report resource is allocated by the resource allocation method, the indication for resource allocation can be used for the semi-persistent channel status report and the aperiodic channel status report. Therefore, as described above, the terminal can identify whether the indication triggers the aperiodic channel status report or activates or deactivates the semi-persistent channel status report, and can identify whether the resource allocation is for the aperiodic channel status report or for the semi-persistent channel status report according to the indication.

[0280] In addition, when the indication for resource allocation is used for semi-persistent CSI-RS transmission and aperiodic CSI-RS transmission, the main points of the present disclosure can be equally applied. That is, the semi-persistent CSI-RS and the aperiodic CSI-RS can be activated / deactivated or sent via the same DCI, and the corresponding trigger can be indicated via the DCI whether it is for the semi-persistent CSI-RS or for the aperiodic CSI-RS.

[0281] As another method, the method described above combining allocation using a higher layer and dynamic allocation can be used. For example, in this method, a plurality of resources for semi-persistent channel state reporting are allocated using a higher layer through resource allocation method 1, and these resources are dynamically selected through DCI or MAC CE. This method can be supported using an independent DCI or MAC CE field. Alternatively, when the base station indicates to the terminal that semi-persistent channel state reporting is supported using one bit, the terminal can interpret the resource allocation field for aperiodic channel state reporting differently as a resource selection field for semi-persistent channel state reporting.

[0282] As described above, both aperiodic channel status reports and semi-persistent channel status reports can support multiple subband reports. As described above, the periodic channel status reports of the existing LTE system have dependencies between reporting time points (inter-subframe dependency). However, in this case, if one piece of information is not decoded correctly, all other information cannot be decoded correctly. For example, if the RI is not decoded correctly, all PMI and CQI information related to this RI report cannot be decoded correctly. Therefore, the NR system is needed to reduce this dependency. However, the reporting amount of subband reports has increased. To this end, if the report is performed at a separate reporting time, the number of reporting time points will increase, and therefore the dependency between reporting time points will also increase. In this case, if the previous report is not performed correctly, the subsequent report will lose validity. In addition, assuming that the time point of the periodic channel status report cannot always be guaranteed in an unlicensed band, this risk will increase. In order to reduce the amount of information transmission of the corresponding report, unlike the aperiodic channel status report, the semi-persistent channel status report can consider the following method.

[0283] - Subband information amount reduction method 1 for semi-persistent channel status reporting: A method using relatively large subbands.

[0284] - Subband information amount reduction method 2 for semi-persistent channel status reporting: A method of using subbands with different sizes according to the size allowed in resource allocation and the amount of report information to be reported at a reporting time point.

[0285] Subband information amount reduction method 1 for semi-persistent channel state reporting uses relatively large subbands. For example, the LTE system uses subbands of one, two, three or four PRBs depending on the system bandwidth. In this case, when supporting subbands of two, four, three or eight PRBs for semi-persistent channel state reporting, the channel state information reporting amount of the subband can be halved.

[0286] Subband information amount reduction method 2 for semi-persistent channel status reporting is a method of using subbands with different sizes according to the size allowed in resource allocation and the amount of report information to be reported at a reporting time point. Table 5s shows resource configuration for PUCCH formats 4 and 5 for LTE systems.

[0287]

Table 5s

[0288]

[0289] According to PUCCH formats 4 and 5, up to 96 bits (in one RB configuration) and up to 48 bits can be sent, respectively. In the case of format 4, multiple RBs can be configured, so as many bits as the number of RBs multiplied by 96 bits can be sent. Therefore, the terminal can calculate the subband information that can be transmitted by calculating the maximum transmission amount. Here, various aspects such as multi-cell, multiple CSI processes, multiple CSI measurement set triggering, and whether type IICSI is transmitted simultaneously can be considered to perform the calculation. For example, when a subband channel status report requires 20 bits and there is a remaining space of 40 bits allowed for the entire semi-persistent channel status report, the terminal can generate two subband information by configuring the subband size to the entire system band or half of the total band allocated to the terminal, and the subband channel status information can be reported to the base station.

[0290] As described above, semi-persistent channel state reporting can support both type I channel state information and type II channel state information. Here, one measurement setting or CSI process can be configured to support both type I channel state information and type II channel state information at different reporting time points. Figure 5C An example is shown that supports both Type I and Type II channel reporting.

[0291] As described above, Type II channel status reports require a large amount of information. Therefore, it may be difficult to report Type II information together with Type I information. Here, the following method can be used to report channel status information.

[0292] - Reporting method 1 when a conflict occurs between a Type I channel status report and a Type II channel status report: Type II information may be sent first.

[0293] - Reporting method 2 when a conflict occurs between a type I channel status report and a type II channel status report: Information configured by the base station via a higher layer may be selected and transmitted.

[0294] In reporting method 1, when a conflict occurs between a type I channel status report and a type II channel status report, type II information is sent first. As described above, since type II information provides a large amount of information and includes high reference signal overhead, high UE complexity, and high reporting overhead required to generate the information, type II information is generated or triggered over a long period of time. On the other hand, type 1 information requires relatively low reference signal overhead, low UE complexity, and low reporting overhead, and is therefore generated and reported relatively frequently. Therefore, since type II information is more important information, it is beneficial for the base station that the terminal sends type II channel status information first. This method can be equally applied to LTE systems. Compared with existing codebooks, LTE systems support advanced channel status reporting through the following linear combinations.

[0295] The precoder is normalized by the following equation:

[0296]

[0297] -For rank 1: and

[0298] -For rank 2: and

[0299] -c r，l =[c r，l，0 , …, c r，l，L-1 ] T , r = 0, 1, l = 0, 1

[0300]

[0301] L=2 indicates the number of beams

[0302] is the 2D DFT beam from the oversampled grid

[0303] k 1 =0, 1, ..., N 1 O 1 -1

[0304] k 2 =0, 1, ..., N 2 O 2 -1

[0305] O≤P i ≤1 is the beam power scaling factor for beam i

[0306] c r，l，i is the beam combining coefficient for beam i, polarization r and layer l

[0307] Here, the beam selection of W1 is expressed as follows.

[0308] O 1 =O 2 =4(if N 2 =1,O 2 =1)

[0309] 2N 1 N 2 ∈{4, 8, 12, 16, 20, 24, 28, 32}

[0310] The leading(stronger)beam index:

[0311] -

[0312] -

[0313] The second(weaker)beam index:

[0314] -

[0315] -

[0316] *d 1 ∈{0 ， ..., min(N 1 , L 1 )-1}

[0317] *d 2 ∈{O,...,min(N 2 , L 2 )-1}

[0318] *(d 1 , d 2 )≠(0,0)

[0319] *Where L 1 , L 2 are defined as:

[0320] -If N 1 ≥N 2 and N 2 ≠1→L 1 =4,L 2 =2

[0321] -If N 1 <N 2 and N 2 ≠1→L 1 =4,L 2 =2

[0322] -If N 2 =1→L 1 =8,L 2 =1

[0323] Furthermore, here, the beam power of W1 is determined as follows.

[0324] The second beam power is quantized into 2 bits.

[0325]

[0326] Furthermore, here, W2 is determined as follows.

[0327] c 0，0，0 =c 0，1，0 =1Always

[0328]

[0329] When N1=N2=4, the overhead of W1 is as follows.

[0330] Indicates the leading beam: (bits: bits)

[0331] Indicate the second beam:

[0332] Relative power of the weaker beam: 2 bits

[0333] Furthermore, the number of bits of W1 and W2 according to each rank is shown below.

[0334]

Table 5t

[0335] rank W1(bit) W2(bit) 1 13 6 2 13 12

[0336] In reporting method 2, when a conflict occurs between a type I channel state report and a type II channel state report, information configured by the base station via a higher layer is selected and sent. The base station can directly configure the reporting priority for the terminal through a higher layer. Therefore, the terminal determines the reporting priority when a conflict occurs according to the priority configured in the measurement setting. This method can be used for the same channel state report (type I and type II).

[0337] Although the proposed method of the present disclosure has been described as being used for downlink channel status reporting, the proposed method of the present disclosure may also be equally applied to uplink channel status reporting and sidelink channel status reporting.

[0338] Although the proposed method of the present disclosure has been described as being used for semi-persistent channel status reporting and aperiodic channel status reporting, the proposed method of the present disclosure may also be equally applied to semi-persistent CSI-RS and aperiodic CSI-RS.

[0339] The reference signal required by the terminal for channel estimation when receiving data is sent at regular frequencies and time intervals.

[0340] Figure 5D Examples of time and frequency spacing between reference signals are shown.

[0341] Figure 5DThe time and frequency spacing between the reference signals shown may vary according to the subcarrier spacing. The spacing varies depending on the maximum delay spread and maximum Doppler spread that occur in the channel according to the subcarrier spacing. Equations 3 and 4 represent the time and frequency spacing between the reference signals taking into account the maximum delay spread and the maximum Doppler spread.

[0342] [Equation 3]

[0343]

[0344] [Equation 4]

[0345]

[0346] Here, v max represents the maximum Doppler spread, T symbol represents the OFDM symbol duration, Δf represents the subcarrier spacing, and τ max represents the maximum delay spread. In NR systems, Δf and T symbol Both change inversely proportional to the change in the subcarrier spacing. Therefore, the efficiency of the base station in sending data to the terminal changes depending on the subcarrier spacing or the parameter set.

[0347] Even if data is sent in the same frequency band, system performance will change according to the subcarrier spacing. Therefore, in order to cope with changes in system performance, the terminal can send a channel status report to the base station by reflecting the subcarrier spacing or parameter set to the base station. When the terminal sends a channel status report to the base station by reflecting the subcarrier spacing or parameter set, the terminal can report accurate channel status, CQI, etc. to the base station, and the base station can minimize data loss and maximize system performance based on this. In order to perform a report reflecting the subcarrier spacing or parameter set, the base station can configure the subcarrier spacing for the terminal by using the following method.

[0348] - Subcarrier spacing configuration method 1 for channel status reporting: The subcarrier spacing for channel status reporting is configured using a direct method.

[0349] - Subcarrier spacing configuration method 2 for channel status reporting: The subcarrier spacing for channel status reporting is configured using an indirect method.

[0350] Subcarrier spacing configuration method 1 for channel status reporting is a method for configuring subcarrier spacing for channel status reporting by using a direct method. In this method, the base station directly sets the subcarrier spacing required for channel status reporting for the terminal, so that the terminal can identify the subcarrier spacing used for data transmission and can receive data. To this end, the base station can configure or send the subcarrier spacing to the terminal by using RRC signaling, MAC CE or DCI. When using MAC CE or DCI, the base station can specify some of the subcarrier spacing candidates pre-configured via RRC signaling through MAC CE or DCI, can reselect some of the subcarrier spacing candidates configured via RRC signaling through MAC CE as candidates for DCI indication, and can finally select the subcarrier spacing via DCI.

[0351] Subcarrier spacing configuration method 2 for channel status reporting is a method for configuring subcarrier spacing for channel status reporting by using an indirect method. The base station can indirectly configure the subcarrier spacing in order to configure the subcarrier spacing for channel status reporting. For example, the terminal can identify the subcarrier spacing for channel status reporting by a reference parameter set configured by the base station. For example, when the reference parameter set is 15kHz, the terminal can recognize that the parameter for channel status reporting is also 15kHz. In another example, the subcarrier spacing or parameter set of CSI-RS can also be followed. The terminal can identify the subcarrier spacing or parameter set for channel status reporting based on the parameter set configured for CSI-RS transmission performed or configured for channel status reporting to the terminal. In another example, the parameter set of the data transmission most recently performed on the terminal can be used. In the NR system, general data and data sent for high mobility and URLLC transmission may have different parameter sets. Here, the channel status report can be performed according to the parameter set of the most recently performed data transmission.

[0352] Figure 5E is a flowchart illustrating an operation sequence of a terminal according to an embodiment of the present disclosure.

[0353] refer to Figure 5EIn operation 555, the terminal receives configuration information associated with the CSI-RS and the channel state report configuration. In addition, the terminal can identify the number of ports for the corresponding non-precoded (NP) CSI-RS, the number of antennas by dimension (i.e., N1 and N2), the oversampling factor by dimension (i.e., O1 and O2), a subframe configuration for the transmission of multiple CSI-RSs and multiple resource configurations for the configuration of the position, codebook subset restriction related information, CSI report related information, CSI process index and transmission power information (Pc) at least one based on the received configuration information. Next, in operation 560, the terminal receives a piece of feedback configuration information based on the position of the CSI-RS. The feedback configuration information may include the period and offset of PMI and / or CQI, the period and offset of RI, the period and offset of CRI, and whether it is wideband or subband, or submode. In operation 565, the terminal receives the CSI-RS based on the information, and estimates the channel between the base station antenna and the receiving antenna of the terminal based on the received CSI-RS. In operation 570, the terminal generates feedback information rank, PMI and CQI based on the estimated channel by using the received feedback configuration, and can select the best CRI based on the feedback information rank, PMI and CQI. Next, in operation 575, the terminal sends multiple feedback information to the base station at a predetermined feedback timing according to the feedback configuration or the non-periodic channel state report trigger of the base station, thereby completing the generation and reporting of channel feedback.

[0354] Fig. 6A An example is shown in which one-to-one communication (ie, unicast communication) is performed between two terminals 601a and 605a through a side link.

[0355] Fig. 6A An example is shown where a signal is sent from a first terminal 601a to a second terminal 605a, and the direction of signal transmission can be reversed. That is, a signal can be sent from a second terminal 605a to a first terminal 601a. ​​Terminals 607a and 609a other than the first terminal 601a and the second terminal 605a may not receive signals exchanged by unicast communication between the first terminal 601a and the second terminal 605a. Signal exchange by unicast communication between the first terminal 601a and the second terminal 605a can be performed by mapping in resources promised between the first terminal 601a and the second terminal 605a, or can be performed by scrambling using the value promised therebetween, mapping control information, using mutually configured values ​​for data transmission, and identifying unique ID values ​​from each other. The terminal can be a mobile terminal such as a vehicle. For unicast communication, separate control information, physical control channels, and data can be sent.

[0356] Figure 6BAn example of multicast communication 610b is shown in which one terminal 601b sends common data to multiple terminals 603b, 605b, 607b and 609b via a side link.

[0357] exist Figure 6B , an example is shown in which a first terminal 601b transmits a signal to other terminals 603b, 605b, 607b, and 609b in a group, and other terminals 611b and 613b not included in the group may not receive the signal transmitted for multicast communication.

[0358] A terminal for sending a signal for multicast communication may correspond to another terminal in the group, and resource allocation for signal transmission may be provided by a base station or a terminal acting as a leader in the group, or may be selected by the terminal itself that has sent the signal. The terminal may be a mobile terminal such as a vehicle. For multicast, separate control information, physical control channels, and data may be sent.

[0359] Figure 6C A process is shown in which terminals 603c, 605c, 607c, and 609c that have received common data by multicast send information associated with the success or failure of data reception to a terminal 601c that has sent data. The information may be information such as HARQ-ACK feedback 611c. In addition, the terminal may be a terminal having an LTE-based sidelink function or an NR-based sidelink function. If the terminal only has an LTE-based sidelink function, the terminal may not be able to send or receive an NR-based sidelink signal and an NR-based physical channel. In the present disclosure, the sidelink may be used interchangeably with PC5, V2X, or D2D. Figures 5 and 6 show examples of transmission or reception according to multicast, but these descriptions may also be applied to unicast signal transmission or reception between terminals.

[0360] Figure 7 It shows how the synchronization signals and physical broadcast channel (PBCH) of the NR system are mapped in the frequency domain and time domain.

[0361] A primary synchronization signal (PSS) 701, a secondary synchronization signal (SSS) 703, and a PBCH are mapped to 4 OFDM symbols, the PSS 701 and the SSS 703 are mapped to 12 RBs, and the PBCH 705 is mapped to 20 RBs. Figure 7 The table in shows that the frequency band of 20 RBs varies according to the subcarrier spacing (SCS). The resource region in which PSS 701, SSS 703, and PBCH 705 are transmitted may be referred to as an SS / PBCH block. In addition, the SS / PBCH block may be referred to as an SSB block.

[0362] Figure 8The symbols to which one SS / PBCH block in a time slot is mapped are shown.

[0363] refer to Figure 8 , shows an example of a conventional LTE system using a subcarrier spacing of 15kHz and an NR system using a subcarrier spacing of 30kHz, and the SS / PBCH blocks 811, 813, 815, and 817 of the NR system are designed to be transmitted at positions 801, 803, 805, and 807, where the cell-specific reference signal (CRS) that is always transmitted in the LTE system can be avoided. Such a design allows the LTE system and the NR system to coexist in a single frequency band.

[0364] Fig. 9 It shows the symbols to which the SS / PBCH block can be transmitted according to the subcarrier spacing.

[0365] refer to Fig. 9 , the subcarrier spacing can be configured as 15kHz, 30kHz, 120kHz, 240kHz, etc., and the position of the symbol of the SS / PBCH block (or SSB block) can be determined according to each subcarrier spacing. Fig. 9 The figure shows the position of the symbol of the SSB block that can be transmitted in the symbol within 1 ms according to the subcarrier spacing, and it is not always necessary to transmit Fig. 9 SSB blocks in the area shown. Therefore, the location of sending SSB blocks can be configured for the terminal through system information or dedicated signaling.

[0366] Fig.10 It shows the symbols to which the SS / PBCH block can be transmitted according to the subcarrier spacing.

[0367] refer to Fig.10 , the subcarrier spacing can be configured as 15kHz, 30kHz, 120kHz, 240kHz, etc., and the position of the symbol of the SS / PBCH block (or SSB block) can be determined according to each subcarrier spacing. Fig.10 The position of the symbol where the SSB block can be sent according to the subcarrier spacing in the symbol within 5ms is shown, and the position where the SSB block is sent can be configured for the terminal through system information or dedicated signaling. In the area where the SS / PBCH block can be sent, it is not always necessary to send the SS / PBCH block, and the SS / PBCH block may or may not be sent depending on the selection of the base station. Therefore, the position where the SSB block is sent can be configured for the terminal through system information or dedicated signaling.

[0368] In the present disclosure, a sidelink control channel may be referred to as a physical sidelink control channel (PSCCH), and a sidelink shared channel or a sidelink data channel may be referred to as a physical sidelink shared channel (PSSCH). In addition, a broadcast channel broadcast together with a 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). In order to perform feedback transmission, PSCCH or PSSCH may be used. Depending on the communication system used for channel transmission, the channel may be referred to as LTE-PSCCH, LTE-PSSCH, NR-PSCCH, NR-PSSCH, etc. In the present disclosure, a sidelink may indicate a link between terminals, and a Uu link may indicate a link between a base station and a terminal.

[0369] Fig.11 An example of a resource pool is shown, which is defined as a set of resources in the time and frequency domains used for transmission or reception over a sidelink.

[0370] Reference numeral 1110 is an example showing a case where resource pools are allocated non-contiguously in the time domain and the frequency domain. In the present disclosure, the case where resource pools are allocated non-contiguously in the frequency domain is mainly discussed. However, it should be noted that resource pools may be allocated continuously in the frequency domain.

[0371] Reference numeral 1120 is an example showing a case where non-contiguous resource allocation is performed in the frequency domain. The unit (granularity) of resource allocation in the frequency domain may be a physical resource block (PRB).

[0372] Reference numeral 1121 is an example showing a case where resource allocation in the frequency domain is performed based on a subchannel. A subchannel may be defined by a unit of frequency, including a plurality of RBs. In other words, a subchannel may be defined as an integer multiple of an RB. Fig.11 Reference numeral 1121 shows a case where the size of a subchannel is configured by four consecutive PRBs. Subchannels can be configured to have different sizes, and one subchannel is generally configured by consecutive PRBs. However, there is no restriction that it must be configured by consecutive PRBs. A subchannel can be a basic unit of resource allocation for a physical sidelink shared channel (PSSCH) or a physical sidelink control channel (PSCCH). Therefore, the size of a subchannel can be configured differently depending on whether the corresponding channel is a PSSCH or a PSCCH. Note that as a term, a subchannel can be replaced by a resource block group (RBG). The following embodiments describe a method for non-continuously allocating a resource pool in the frequency domain and classifying the resource pool into a plurality of subchannels.

[0373] The startRBSubchannel indicated by reference numeral 1122 indicates the starting position of the subchannel in the frequency domain in the resource pool.

[0374] A resource block as a frequency resource belonging to a resource pool for a PSSCH in an LTE V2X system may be determined by the following method:

[0375] -The resource block pool consists of N subCH sub-channels, where N subCH It is given by the higher-level parameter numSubchannel.

[0376] - Subchannel m (m = 0, 1, ..., N subCH -1) by n subCHsize The physical resource block number is n. PRB =n subCHRBstar +m*n subCHsize +j, j = 0, 1, ..., n subCHsize -1, where n subCHRBstar and n subCHsize They are given by the higher-level parameters startRBSubchannel and sizeSubchannel respectively.

[0377] Reference numeral 1130 shows an example of a case where non-continuous resource allocation is performed in the time domain. The unit (granularity) of resource allocation in the time domain may be a time slot. In the present disclosure, the case where resource pools are allocated non-continuously in the time domain is mainly discussed. However, it should be noted that resource pools may be allocated continuously in the time domain.

[0378] The startSlot indicated by reference numeral 1131 indicates the start position of a time slot in the time domain in the resource pool.

[0379] Subframe The time resources belonging to the resource pool for the PSSCH in the LTE V2X system may be determined by the following method.

[0380]

[0381]

[0382] Fig.12 An example of a method of allocating scheduled resources (mode 1) by a side link is shown. Scheduled resource allocation (mode 1) is a method in which a base station allocates resources for side link transmission to an RRC-connected UE in a dedicated scheduling manner. Because the base station can manage the resources of the side link, the scheduled resource allocation method may be effective for interference management and resource pool management.

[0383] exist Fig.12In the present invention, a UE 1201 that is camping (indicated by reference numeral 1205) receives a side link system information bit (SL SIB) (indicated by reference numeral 1210) from a base station 1203. The system information may include resource pool information for transmission or reception, configuration information for sensing operation, information for configuration synchronization, information for inter-frequency transmission or reception, etc. If data traffic for V2X is generated in UE 1201, an RRC connection (indicated by reference numeral 1220) is established with the base station 1203. Here, the RRC connection between the UE and the base station may be referred to as Uu-RRC. The process of Uu-RRC connection may be performed before data traffic is generated. UE 1201 requests transmission resources (indicated by reference numeral 1230) that can perform V2X communication with other UEs 1202 from the base station 1203. At this time, UE 1201 may request transmission resources from the base station 1203 by using an RRC message or a MAC CE. Here, as an RRC message, SidelinkUEInformation and UEAssistanceInformation messages may be used. At the same time, the MAC CE may be, for example, a buffer status report MAC CE having a new format (including at least an indicator notifying a buffer status report for V2X communication and information about the amount of data buffered for D2D communication). The detailed format and content of the buffer status report used in 3GPP can be understood by referring to the 3GPP standard TS36.321 "E-UTRA MAC Protocol Specification". The base station 1203 allocates V2X transmission resources to the UE 1201 through a dedicated Uu-RRC message. The message may be included in the RRCConnectionReconfiguration message. Resource allocation may be performed according to the type of traffic requested by the UE 1201 or according to whether the corresponding link is congested, using V2X resources through Uu, or using resources for PC5. In order to determine resource allocation, the UE 1201 may add the logical channel ID (LCID) information of the V2X traffic or the prose per packet priority (PPPP) to the UEAssistanceInformation or MAC CE, and send the UEAssistanceInformation or MAC CE to which the LCID or PPPP is added. Since the base station 1203 knows information about resources used by other UEs 1202, the base station allocates the remaining resource pool (indicated by reference numeral 1235) among the resources requested by the UE 1201. The base station 1203 may instruct the UE 1201 to perform final scheduling (indicated by reference numeral 1240) via DCI transmission through the PDCCH.

[0384] Next, in the case of broadcast transmission, UE 1201 broadcasts sidelink control information (SCI) to other UEs 1202 via PSCCH using broadcast transmission without the need for additional RRC configuration of the sidelink (indicated by reference numeral 1260). In addition, UE 1201 broadcasts data to other UEs 1220 via PSSCH (indicated by reference numeral 1270).

[0385] Alternatively, in the case of unicast and multicast transmission, UE 1201 can establish RRC connections with other UEs one by one. Here, in order to distinguish it from Uu-RRC, the RRC connection between UEs can be referred to as PC5-RRC. Even in the case of multicast communication, PC5-RRC is a separate connection between UEs belonging to a group. Fig.12 In the embodiment, PC5-RRC connection 1215 is shown as being performed after operation 1210, but the PC5-RRC connection can be performed before operation 1210 or at any time before operation 1260. If an RRC connection between UEs is required, a PC5-RRC connection for the side link is established, and side link control information (SCI) is sent to other UEs 1202 via unicast and multicast transmissions through PSCCH (indicated by reference numeral 1260). Here, the multicast transmission of SCI can be interpreted as group SCI. In addition, the UE sends data to other UEs 1202 via unicast and multicast transmissions through PSSCH (indicated by reference numeral 1270).

[0386] Fig.13 An example of a method of UE autonomous resource allocation (Mode 2) through a sidelink is shown.

[0387] According to UE autonomous resource allocation (mode 2), the base station provides a resource pool for V2X sidelink transmission / reception through system information, and the UE selects transmission resources according to a predetermined rule. Resource selection methods may include zone mapping, sensing-based resource selection, random selection, etc. The difference is that, unlike the scheduled resource allocation method (mode 1) in which the base station itself participates in resource allocation, in Fig.13 In the V2X communication, the UE 1301 autonomously selects resources based on the resource pool previously received through the system information and transmits data. In V2X communication, the base station 1303 can allocate various types of resource pools (V2V resource pool and V2P resource pool) to the UE 1301. The resource pool may include a resource pool in which the UE autonomously selects available resources after sensing resources used by other neighboring UEs, and a resource pool in which the UE randomly selects resources from a preconfigured resource pool.

[0388] The camping UE 1301 (indicated by reference numeral 1305) receives a side link system information bit (SL SIB) (indicated by reference numeral 1310) from the base station 1303. The system information may include resource pool information for transmission or reception, configuration information for sensing operation, information for configuration synchronization, information for inter-frequency transmission or reception, etc. Fig.12 and Fig.13 The main difference between the operations is that Fig.12 In the embodiment, the base station 1203 and the UE 1201 operate in the RRC connected state, and Fig.13 In the embodiment, the base station and the UE may operate even in an idle mode in which the RRC is not connected (indicated by reference numeral 1320). In addition, even in the RRC connected state (indicated by reference numeral 1320), the base station 1303 itself may not participate in resource allocation, and the UE 1301 may operate to autonomously select transmission resources. Here, the RRC connection between the UE 1301 and the base station 1303 may be referred to as Uu-RRC. If data traffic for V2X is generated in the UE 1301, the UE 1301 selects a resource pool in the time / frequency domain from among the resource pools received from the base station 1303 through the system information according to the configured transmission operation (indicated by reference numeral 1330).

[0389] Next, in the case of broadcast transmission, UE 1301 can broadcast sidelink control information (SCI) (indicated by reference numeral 1350) to other UEs 1302 via broadcast transmission and through PSCCH, without the need for additional RRC configuration of the sidelink. In addition, the UE broadcasts data (indicated by reference numeral 1360) to other UEs 1302 through PSSCH.

[0390] Alternatively, in the case of unicast and multicast transmission, UE 1301 can establish an RRC connection with other UE 1302 on a one-to-one basis. Here, in order to distinguish it from Uu-RRC, the RRC connection between UE and UE can be referred to as PC5-RRC. Even in the case of multicast communication, PC5-RRC is a separate connection between UEs belonging to the group. Such a connection can be similar to the connection in the RRC layer in the connection between the base station and the UE in the traditional NR uplink and downlink, and the connection in the RRC layer through the side link can be referred to as PC5-RRC. UE capability information for the side link can be exchanged through the PC5-RRC connection, or configuration information required for signal transmission or reception can be exchanged. Fig.13In the embodiment, PC5-RRC connection 1315 is shown as being performed after operation 1310, but may be performed before operation 1310 or at any time before operation 1350. If an RRC connection between UEs is required, a PC5-RRC connection for the side link is established (indicated by reference numeral 1315), and side link control information (SCI) is sent to other UEs 1302 via unicast and multicast transmissions through PSCCH (indicated by reference numeral 1350). Here, multicast transmission of SCI may be interpreted as group SCI. In addition, the UE sends data to other UEs 1302 via unicast and multicast transmissions via PSSCH (indicated by reference numeral 1360).

[0391] In the present disclosure, sensing window A and sensing window B are defined in order to effectively perform sensing when periodic and non-periodic traffic coexist.

[0392] 14 shows an example of a method for configuring sensing window A and sensing window B for UE autonomous resource allocation (mode 2) through a sidelink.

[0393] like Fig.14A As shown, in the case where a trigger for selecting a transmission resource occurs in time slot n (indicated by reference numeral 1401), a sensing window A 1402 may be defined as follows.

[0394] *The sensing window A can be defined as the time slot interval of . Here, T 0 It may be determined as a fixed value, or may be determined as a configurable value.

[0395] **As T 0 An example of a case where a fixed value is determined, for periodic traffic, T 0 It can be represented by 1000*2μ. Alternatively, for non-periodic traffic, T 0 Can be configured as a fixed value of 100*2μ. The fixed T 0 The value may be changed to another value according to the traffic characteristics considered, and may be fixed to the same value for periodic and aperiodic traffic. Here, μ is an index corresponding to a parameter set, and is configured to the following values ​​according to a subcarrier spacing (SCS).

[0396] ***SCS=15kHz,μ=0

[0397] ***SCS=30kHz,μ=1

[0398] ***SCS=60kHz,μ=2

[0399] ***SCS=120kHz,μ=3

[0400] For T 0 In the case where it is determined to be configurable, the configuration for the determination may be indicated by a side link system information bit (SL SIB) or UE-specific higher layer signaling. If the determination is indicated by an SL SIB, a corresponding value may be configured in the resource pool information in the corresponding system information. 0 The situation indicates that the reserved T is always used in the resource pool. 0 .

[0401] *In sensing window A, SCI decoding and sidelink measurements for other UEs can be performed.

[0402] **Based on the SCI received in sensing window A, resource allocation information of other UEs and QoS information of the packet can be obtained. Here, the resource allocation information may include a reserved interval for resources. In addition, the QoS information may include latency, reliability, the minimum communication range required for the transmitted traffic, and priority information according to data rate requirements. The location information of other UEs can be obtained from the received SCI. The TX-RX distance can be calculated from the location information of another terminal and the location information of the terminal itself.

[0403] **The side link reference signal received power (SLRSRP) can be measured based on the SCI received in sensing window A.

[0404] **The side link received signal strength indicator (SL RSSI) can be measured in sensing window A.

[0405] Sensing window A can be mainly used to determine resources for UE autonomous resource allocation (mode 2) by sensing periodic traffic. If it is determined that it is inefficient to identify periodic resource allocation information of other terminals through SCI decoding and allocate transmission resources to the other terminals using the results of side link measurements such as SLRSRP or SL RSSI, the corresponding resources can be excluded from resource selection window 1403. Fig.14A As shown, if a trigger for selection of a transmission resource occurs in time slot n (indicated by reference numeral 1401), a resource selection window 1403 may be defined as follows.

[0406] *The resource selection window can be defined as the time slot interval. Here, T 1 and T 2 may be determined as a fixed value or may be determined as a configurable value. Alternatively, T 1 and T 2 is determined to be within a fixed range, and considering the implementation mode, the terminal can configure its appropriate value within the fixed range.

[0407] **As one of the T 1 and T 2 In an example where the UE is determined to be within a fixed range and the terminal configures its appropriate value within the fixed range taking into account the implementation, these values ​​can be configured in T according to the UE implementation. 1 ≤4 and 20≤T 2 In the range of ≤100.

[0408] *The final transmission resource may be selected in the resource selection window by using the result of the sensing performed in the sensing window A.

[0409] When sensing is performed using only sensing window A (such as Fig.14A As shown) and when transmission resource selection is performed by sensing, the following transmission resource selection method can be used.

[0410] *Transmission resource selection method-1

[0411] **Step-1: Based on the resource pool information, determine the number of resource candidates M to which resources can be allocated in the resource selection window 1403 total The details can be understood by referring to Example 1.

[0412] **Step-2: By using the sensing results in the sensing window A 1402, exclude the resources in the resource selection window 1403 that are determined to be unavailable for occupation and used by another UE, and leave X (≤M total ) candidate resources to which resources can be allocated. The method of excluding resources can be used by performing SCI decoding and side link measurement of another terminal.

[0413] **Step-3: Report the resource candidate list X to the higher layer of the UE, and randomly select the final transmission resource from among the X candidates via the higher layer of the UE (indicated by reference numeral 1406).

[0414] like Fig. 14B As shown, in the event that a trigger for selection of a transmission resource occurs in time slot n (indicated by reference numeral 1401b), a sensing window B 1404b may be defined as follows.

[0415] *The sensing window B can be defined as the time slot interval of . Here, T 1 ' and T 2 ' may be determined as a fixed value, or may be determined to be configurable. Alternatively, T 1 ' and T 2' is determined within a fixed range, and considering the implementation, the UE can configure an appropriate value within the fixed range. In addition, in the case where k indicates a time slot in which a resource is finally selected, the sensing window B stops in the time slot k, and the sensing window B at this time becomes.

[0416] **T 1 ' and T 2 ' can be configured to be Fig.14A In the resource selection window 1403, T 1 and T 2 The value of can be the same value, or can be configured as different values.

[0417] **For example, if T 1 ' is configured as 0, then T 1 ' indicates that sensing is performed from the triggering time slot n used to select the transmission resource.

[0418] **Depending on the configured T 1 ' and T 2 ', the sensing window B can be configured as one time slot or one or more time slots.

[0419] *In sensing window B, SCI decoding and sidelink measurements for other UEs can be performed.

[0420] **The details of the sensing operation in the sensing window B can be understood by referring to Embodiments 2 and 3.

[0421] By additionally sensing the periodic and aperiodic traffic in sensing window A, the sensing window B can be used to determine the resources for UE autonomous resource allocation (mode 2). The sensing window B configured after the trigger time slot n for selecting the transmission resource enables sensing of aperiodic traffic that cannot be predicted in the sensing window A by using sidelink measurements of the time slot to which the actual transmission resource can be allocated. Sensing through the sensing window B can be understood as an operation of performing sensing of traffic, which is sensed in each time slot regardless of whether the traffic is periodic or aperiodic. If the sensing window B is used as shown in FIG. Fig. 14B If sensing is performed within the sensing window B shown and transmission resource selection is performed accordingly, the following transmission resource selection method may be used.

[0422] *Transmission resource selection method-2

[0423] **Step-1: Perform sensing in a corresponding time slot in sensing window B 1404b to determine whether a corresponding resource is in an idle state.

[0424] ***The resource allocation unit in the frequency domain can be A (≥1) subchannels, or can be defined as all subchannels. The number of candidate resources N that can be allocated in the corresponding time slot is determined according to the resource allocation unit in the frequency domain. total .

[0425] ***Sensing can be performed through SCI decoding and sidelink measurement.

[0426] **Step-2-1: If it is determined through the sensing in step-1 that the corresponding resource is in an idle state, then N of the resources that can be allocated in the corresponding time slot total The final transmission resource 1406b is determined from the candidate resources.

[0427] **Step-2-2: If it is determined through the sensing in step-1 that the corresponding resource is in a busy state, the following operation may be selected.

[0428] ***If the next time slot is also configured via sensing window B 1404b, step -1 is performed after the next time slot.

[0429] ***If the next time slot is not configured via sensing window B 1404b, the following operations may be considered.

[0430] ***Use the QoS information in the current time slot or the result of energy detection to determine the final transmission resource 1406b. QoS information includes priority, delay, reliability, proximity service (ProSe) per packet priority (PPPP), proximity service per packet reliability (PPPR), the minimum communication range required for the transmitted traffic, and priority information according to the data rate requirement. The priority can represent PPPP and PPPR, and can be a value selected from a predetermined value range, and the data that needs to be sent on the side link can include a priority value.

[0431] ***The transmission in the current time slot can be canceled and a fallback operation can be performed.

[0432] If through Fig.14A and Fig. 14B As defined, sensing window A and sensing window B can be classified based on the time point of triggering the selection of the transmission resource. Specifically, the sensing interval configured before the trigger time slot n for selecting the transmission resource can be defined as sensing window A, and the sensing interval configured after the trigger time slot n can be defined as sensing window B.

[0433] Fig. 14C1402c and sensing window B 1404c. Fig. 14C As shown) and the selection of transmission resources is performed accordingly, the following transmission resource selection method can be used.

[0434] *Transmission resource selection method-3

[0435] **Step-1: Based on the resource pool information, determine the number of resource candidates M to which resources can be allocated in the resource selection window 1403c total .

[0436] **Step-2: By using the sensing result in sensing window A 1402c, exclude the resources determined to be unavailable for occupation and used by another UE in resource selection window 1403c, and leave X(≤M total ) candidate resources to which resources may be allocated. A method for excluding resources may be used by performing SCI decoding and sidelink measurements of another UE.

[0437] **Step-3: Report the resource candidate list X to the higher layer of the UE, and randomly down-select Y candidates from among the X candidates in the higher layer.

[0438] **Step-4-1: If the sensing window B 1404c is included in the resource selection window 1403c, the UE selects a final transmission resource 1406c from among Y candidates determined in a higher layer based on the transmission resource selection method-2 by using the sensing result of the sensing window B 1404c in the physical layer.

[0439] *** The case where the sensing window B 1404c is included in the resource selection window 1403c corresponds to Fig. 14C This situation can be explained by T 1 and T 2 and T 1 ' and T 2 ' configuration to determine.

[0440] ***Step-4-2: In the case where the sensing window B is not included in the resource selection window 1403c, the final transmission resource 1406c is selected based on the transmission resource selection method-2 using the sensing result in the sensing window B in the physical layer.

[0441] *** The case where the sensing window B 1404c is not included in the resource selection window 1403c corresponds to Fig. 14C This situation can be explained by T 1 and T 2 and T 1 ' and T 2 ' configuration to determine.

[0442] In the transmission resource selection method-3, the step of selecting Y candidates from a higher layer (step-3) may be omitted, and the following method may be used.

[0443] *Transmission resource selection method-4

[0444] **Step-1: Based on the resource pool information, determine the number of resource candidates M to which resources can be allocated in the resource selection window 1403c total .

[0445] **Step-2: By using the sensing result in sensing window A 1402c, exclude the resources determined to be unavailable for occupation and used by another UE in resource selection window 1403c, and leave X(≤M total ) candidate resources to which resources may be allocated. A method for excluding resources may be used by performing SCI decoding and sidelink measurements of another UE.

[0446] **Step-3-1: If the sensing window B 1404c is included in the resource selection window 1403c, the UE selects a final transmission resource 1406c from among X candidates based on the transmission resource selection method-2 by using the sensing result of the sensing window B 1404c in the physical layer.

[0447] *** The case where the sensing window B 1404c is included in the resource selection window 1403c corresponds to Fig. 14C This situation may be caused by T 1 and T 2 and T 1 ' and T 2 ' configuration to determine.

[0448] **Step-3-2: In the case where the sensing window B 1404c is not included in the resource selection window 1403c, the final transmission resource 1406c is selected based on the transmission resource selection method-2 using the sensing result in the sensing window B in the physical layer.

[0449] *** The case where the sensing window B 1404c is not included in the resource selection window 1403c corresponds to Fig. 14C This situation can be explained by T 1 and T 2and T 1 ' and T 2 ' configuration to determine.

[0450] In the case where sensing window A and sensing window B are configured simultaneously, the final resource selection can be determined by resource selection window 1403c and sensing window B 1404c. The transmission resource selection method-3 or transmission resource selection method-4 proposed above configures sensing window A and sensing window B simultaneously to perform sensing when periodic and non-periodic traffic coexist, thereby optimizing transmission resource selection.

[0451] The implementation of the sensing and transmission resource selection operations in the UE autonomous resource allocation (mode 2) of the above-mentioned side link can be performed in various ways. For example, in the case where sensing window A and sensing window B are configured at the same time, the UE can be implemented so that the UE always performs sensing of sensing window A, and if a trigger for the selection of transmission resources occurs in time slot n, the UE performs sensing of sensing window B, and selects the final transmission resource accordingly. However, since the operation in which the UE always performs sensing of sensing window A can use the sensing result of sensing window A at any time, the delay in the selection of transmission resources may be advantageous, but it may be disadvantageous in terms of UE energy consumption. Therefore, according to another method, the UE can be implemented so that when a flow that needs to be sent occurs, the UE immediately performs sensing of sensing window A, and if a trigger for the selection of transmission resources occurs in time slot n, the UE performs sensing of sensing window B, and selects the final transmission resource accordingly. According to another method, minimizing the energy consumption of the UE by performing sensing only when needed may be advantageous, but the delay in the selection of transmission resources may be disadvantageous.

[0452] In the above, an example of the operation of finding empty frequency-time resources for device-to-device communication via a side link and sending a signal in the found resources has been described, but the method and apparatus provided in the present disclosure are not limited thereto and can be applied to various channel occupancy and channel reservation methods.

[0453] Fig.15 The "Mode 1" method is shown, which is a method for receiving scheduling information from a base station and performing sidelink data transmission, as shown above. Fig.12As shown. In the present disclosure, the method for receiving scheduling information from a base station and performing sidelink communication based on the scheduling information is referred to as "Mode 1", but may be referred to by other names. UE 1501 for performing transmission via a side link receives scheduling information 1509 for sidelink communication from a base station 1511. In the present disclosure, UE 1501 for performing data transmission via a side link may be referred to as a transmitting UE, and UE 1503 for performing data reception via a side link may be referred to as a receiving UE. However, each of the transmitting UE 1501 and the receiving UE 1503 may perform data transmission or reception via a side link. Scheduling information 1509 for sidelink communication may be obtained by receiving downlink control information (DCI), and the DCI may include the following multiple pieces of information.

[0454] - Carrier indicator: It can be used to schedule a side link for another carrier if carrier aggregation (CA) has been applied;

[0455] - Lowest index when allocating subchannels for initial transmission: it can be used to allocate frequency resources at the time of initial transmission;

[0456] - Information to be included in the sidelink control information:

[0457] >>Frequency resource allocation information. This information may include resource allocation information or resource reservation information for initial transmission, retransmission, and N subsequent transmissions;

[0458] >> Information about the time interval between initial transmission and retransmission.

[0459] - Information associated with the sidelink timeslot structure. This information may include information associated with timeslots and symbols that may be used for the sidelink.

[0460] -HARQ-ACK or / and CSI feedback timing information: This information may include timing information for sending HARQ-ACK feedback or CSI feedback to the base station via the side link.

[0461] - Receiver ID: ID information associated with the UE that is to perform reception.

[0462] - QoS information (such as priority), which is information associated with the priority of transmitted data.

[0463] Scheduling can be used for scheduling of one-time transmission of the opposite link, or can be used for periodic transmission, semi-persistent scheduling (SPS), or a configured grant transmission method (configured grant). The scheduling method can be distinguished by an indicator included in the DCI, an RNTI scrambled by a CRC added to the DCI, or an ID value. 0 bits, etc. can be added to the DCI to allow the size of the DCI to be the same as the size of another DCI format for downlink scheduling or uplink scheduling.

[0464] The transmitting UE 1501 receives DCI for sidelink scheduling from the base station 1511, transmits a PSCCH including sidelink scheduling information 1507, and transmits a PSSCH (which is data corresponding to the sidelink scheduling information 1507) (indicated by reference numeral 1505). The sidelink scheduling information 1507 may be sidelink control information (SCI), and the SCI may include the following multiple pieces of information.

[0465] - HARQ process number: HARQ process ID of the operation associated with HARQ of the transmitted data.

[0466] - New Data Indicator (NDI): Information associated with whether data currently being sent is new data.

[0467] - Redundancy version: Information associated with parity bits to be transmitted upon mapping after channel encoding of data.

[0468] - Layer 1 Source ID: ID information in the physical layer of the UE performing the transmission.

[0469] - Layer 1 Destination ID: ID information in the physical layer of the UE performing reception.

[0470] - Frequency domain resource allocation for scheduling PSSCH: frequency domain resource configuration information for the transmitted data.

[0471] -MCS: Information about the modulation order and coding rate.

[0472] -QoS indication: This may include priority, target latency / delay, target distance, target error rate, etc.

[0473] - Antenna port: Information about the antenna port used for data transmission.

[0474] -DMRS sequence initialization: It may include information such as an ID value for initializing a DMRS sequence.

[0475] - PTRS-DMRS association: It may include information associated with PTRS mapping.

[0476] -CBGTI: It can be used as an indicator for retransmission in units of CBG.

[0477] - Resource reservation: information used for resource reservation.

[0478] - Time gap between initial transmission and retransmission: Information about the time interval between initial transmission and retransmission.

[0479] - Retransmission Index: An indicator identifying a retransmission.

[0480] -Transmission format / playback type indicator: an indicator that identifies the transmission format or distinguishes between unicast / multicast / broadcast.

[0481] -Zone ID: Sends the location information of the UE.

[0482] -NACK distance: A reference indicator that determines whether the receiving UE needs to send HARQ-ACK / NACK.

[0483] - HARQ feedback indication: It may include whether HARQ feedback needs to be sent, or whether HARQ feedback is being sent.

[0484] -Time domain resource allocation for scheduling PSSCH: time domain resource information of the transmitted sidelink data.

[0485] - Second SCI indication: In case of two-stage control information, an indicator including mapping information of the second SCI.

[0486] -DMRS pattern: information about the DMRS pattern (eg, the position of the symbol to which the DMRS is mapped).

[0487] The control information may be transmitted to the receiving UE after being included in a single SCI, or may be transmitted after being included in two SCIs. Transmission through two SCIs may be referred to as a 2-phase SCI method.

[0488] In the present disclosure, a downlink (DL) may indicate a link through which a signal is transmitted from a base station to a UE. In the present disclosure, an uplink (UL) may indicate a link through which a signal is transmitted from a UE to a base station.

[0489] The present disclosure provides a method and apparatus for transmitting or receiving channel state information (CSI) through a side link.

[0490] [First embodiment]

[0491] The first embodiment provides a method and apparatus for transmitting sidelink control information, wherein the sidelink control information includes whether a CSI-RS is transmitted, whether CSI information is reported, and whether a SL-SCH is included.

[0492] A UE that transmits PSCCH and PSSCH through a side link may include at least one of the following information in an SCI and transmit the SCI to a receiving UE.

[0493] -Information on whether CSI-RS is transmitted: This is to allow a receiving UE to receive CSI-RS and recognize channel state information.

[0494] -Information on whether to report CSI feedback information: When CSI information is mapped to PSSCH resources and transmitted, the receiving UE needs to identify whether the CSI feedback information is mapped to the PSSCH resources in order to successfully decode the PSSCH remaining after excluding the CSI information.

[0495] -Information on whether the side link shared channel (SL-SCH) is included in the PSSCH (indicating whether the SL-SCH is included): This indicates whether the SL-SCH is included in the PSSCH, or only the CSI is mapped to the PSSCH alone.

[0496] For transmission of information, 1 bit of each piece of information may be included in the SCI. For example, an indication (SL-SCH indicator) of whether the SL-SCH is included in the PSSCH may be defined by 1 bit as follows.

[0497] A value of '1' indicates that SL-SCH should be transmitted on PSSCH, and a value of '0' indicates that SL-SCH should not be transmitted on PSSCH.

[0498] If CSI is sent via MAC CE or PC5-RRC, the SL-SCH indicator may not be included in the SCI.

[0499] Alternatively, a method of indicating two or more pieces of information together by using more than 1 bit may be used.

[0500] In the above description, the information about whether SL-SCH is included may be information indicating whether the PSSCH includes only sidelink CSI feedback information or also includes other data. When the PSSCH includes only CSI feedback information and is transmitted, the transmitting UE may not need to send information about PSSCH retransmission to the receiving UE after the corresponding PSSCH transmission or at the initial transmission before the corresponding PSSCH transmission. This is because the PSSCH does not include any data except CSI feedback. Therefore, the SCI for scheduling a PSSCH that includes only sidelink CSI feedback can notify the receiving UE of information indicating that at least one of the following bit fields can be fixed to a specific value, and the corresponding PSSCH includes only CSI feedback.

[0501] - Resource reservation: A bit field indicating information of specific frequency-domain-time-domain resources to be occupied.

[0502] - Frequency resource location for initial transmission and retransmission: A bit field indicating the frequency domain location of the PSSCH, corresponding to the initial transmission or retransmission of the PSSCH to be scheduled.

[0503] -Time gap between initial transmission and retransmission: A bit field indicating the time domain position of the PSSCH, corresponding to the initial transmission or retransmission of the PSSCH to be scheduled, that is, the transmission time gap.

[0504] For example, when a PSSCH including only sidelink CSI feedback is scheduled, the transmitting UE may set the time gap between the initial transmission and retransmission of the SCI used to perform the scheduling to "0000" (all zeros) and transmit the time gap. When the SCI is decoded and the bit field of the time gap between the initial transmission and the retransmission has a value of "0000", the receiving UE may understand that the PSSCH scheduled by the SCI includes only CSI feedback, but not SL-SCH.

[0505] [Second embodiment]

[0506] The second embodiment provides a method and apparatus for determining the size of CSI feedback when sending CSI feedback through a side link.

[0507] When CSI is mapped to PSSCH and transmitted, the following method may be applied.

[0508] -Method 1: The case where CSI feedback is mapped to PSSCH resources and transmitted can be the same as the case where uplink control information (UCI) is mapped to PUSCH and transmitted via uplink in the NR system. In the conventional NR system, when UCI is mapped to PUSCH, the channel coding method to be applied varies depending on the number of bits of UCI. For example, applying iterative coding requires at most 2 bits, applying Reed-Muller (RM) code requires at most 11 bits, and applying polarization code requires 12 bits or more. In the NR system, in order to decode the UCI information, the base station requires a decoder for iterative code, a decoder for Reed-Muller code, and a decoder for uplink polarization code. However, if CSI feedback in sidelink signal transmission and reception is applied as in the case of method 1, the UE requires a decoder for iterative code, a decoder for Reed-Muller code, and a decoder for uplink polarization code. It can be understood that additional UE complexity is required in the NR system. Therefore, in order to minimize UE complexity, the length of the CSI information can be adjusted to at least 12 bits so that the polarization code can always be applied when the CSI is mapped to the PSSCH and transmitted. For example, when the CSI feedback bit is a_0, a_1, ..., a_{N-1}, and the number of bits is N, if N<12, then the a_N, a_{N+1}, ..., a_11 bits can be defined as the value "0". Alternatively, when the number of bits is N, if N<12, the a_N, a_{N+1}, ..., a_11 bits can be defined as the value "1". When CSI is transmitted via PSSCH based on method 1, the resource region to which the CSI is mapped and the number of bits after encoding will be described in detail in the fourth embodiment below. Although method 1 has been described using the case where the CSI feedback information is mapped to the PSSCH and transmitted, method 1 can be applied to the case where the CSI feedback information is transmitted via the physical sidelink feedback channel (PSFCH).

[0509] -Method 2: The case where CSI feedback is mapped to MAC CE or PC5-RRC and sent to PSSCH. In this case, since CSI feedback is SL-SCH, it can be regarded as normal data in the physical layer. In this case, like general data, LDPC code can be applied to CSI.

[0510] [Third embodiment]

[0511] The third embodiment provides a method and apparatus for configuring scheduling information of a PSSCH when CSI information is transmitted and reported through the PSSCH.

[0512] Fig.16An example is shown in which CSI information is sent via the PSSCH while also sending data (i.e., transport block information) sent from a higher layer to the PSSCH. The sending UE maps and sends the PSCCH (indicated by reference numeral 1601), and the SCI included in the PSCCH and sent may include mapping information between CSI information 1603 and data (PSSCH) 1602. Therefore, the sending UE maps the CSI information 1603 and the data (PSSCH) 1602 and sends them. In addition, the DMRS, which is a reference signal for PSSCH reception, is sent together with the mapped information and data (indicated by reference numeral 1604). The information included in the SCI sent via the PSCCH can be determined by the following method. In the disclosure including the above embodiments and the following embodiments, the QoS value may be information indicating a priority value, a target delay value, a target arrival distance, etc., and the data sent from a higher layer may be a side link shared channel (SL-SCH).

[0513] -Method x-1: The QoS value included in the SCI may be determined based on the QoS value corresponding to the transport block 1602. In this method, since the transport block is mapped to the PSSCH and transmitted regardless of whether the CSI information is transmitted, the SCI may include a QoS value or a priority value, which is included in the transport block and may be regarded as data. Even based on this method, in the sensing method for actual channel occupancy, a method of performing channel sensing by prioritizing transmission including CSI information when the same QoS value is obtained may be applied.

[0514] -Method x-2: The QoS value or priority value included in the SCI may be determined based on the QoS value corresponding to the transmission block 1602 and whether CSI information is transmitted. In this method, whether CSI information is transmitted is included in determining the QoS value, so that transmission including CSI takes precedence over transmission not including CSI.

[0515] Fig.17 An example is shown in which only CSI information is included in the PSSCH without data transmitted from a higher layer, that is, transport block information, and the transport block information is not transmitted while the CSI information is transmitted through the PSSCH 1703. In addition, a DMRS, which is a reference signal for PSSCH reception, is transmitted together with the CSI information (indicated by reference numeral 1704). In the present disclosure, Fig.17 An example of transmitting only CSI is shown, but a case where CSI is transmitted via higher signaling such as an RRC layer or a MAC control element (CE) may indicate a case where CSI is included in a PSSCH in the form of a transport block and transmitted. Fig.17It may be shown that only CSI information is transmitted without data, and in this case, the QoS value or priority value of the data transmitted from the higher layer may not exist. Therefore, in this case, a method for determining the QoS value included in the SCI 1701 by the transmitting UE is required. The present disclosure provides a method for determining the QoS value in this case, as shown below.

[0516] - Method y-1: In the case of reporting CSI information, if there is no QoS value transmitted from a higher layer (i.e., if only CSI is transmitted without data transmitted from a higher layer), the QoS value included in the SCI when reporting the CSI information is determined based on the QoS value included in the SCI transmitted together when the CSI-RS is transmitted. As an example, the QoS value included in the SCI when reporting the CSI information may be determined to be the same value as the QoS value included in the SCI transmitted together when the CSI-RS is transmitted. Fig.18 An example of a time slot structure when transmitting CSI-RS and an example of a time slot structure when reporting CSI information are shown. When transmitting CSI-RS1803, the transmitting UE 1811 transmits SCI 1801 and PSSCH 1802 together. SCI 1801 may include a QoS value corresponding to PSSCH 1802. The receiving UE 1813 measures the transmitted CSI-RS1803 to identify the channel state, generates CSI information, and transmits the CSI information to the transmitting UE 1811. When reporting CSI information, the CSI information is mapped to PSSCH 1805 and transmitted, and SCI 1804 is also transmitted to schedule PSSCH 1805. SCI 1804 may include a QoS value, and the value may be the same as the QoS value included in SCI 1801 used when transmitting CSI-RS1803. In the case where CSI information as channel state information is included in MAC CE and transmitted, if only CSI is included in MAC CE and transmitted without other data, when CSI-RS for CSI measurement is transmitted, the QoS value corresponding to MAC CE is determined as the QoS value included in SCI.

[0517] -Method y-2: When a PSSCH including only CSI information is transmitted, a method of fixing the QoS value in the SCI for scheduling the PSSCH to the lowest priority and transmitting the QoS value may be used. Fig.17As shown, if only CSI information is included in PSSCH 1703 (without other data transmitted from a higher layer) and is transmitted, the QoS value included in SCI 1701 for scheduling PSSCH 1703 may be determined as "8". In the above example, the QoS value of 8 may be a value indicating the lowest priority, which may be generated by determining CSI as having a lower priority than other data. In the case where CSI information as channel state information is included in MAC CE and transmitted, if only CSI is included in MAC CE and transmitted without other data, the QoS value corresponding to MAC CE may always be set to the lowest QoS value and included.

[0518] -Method y-3: In this method, a UE transmitting CSI information randomly configures and transmits a QoS value included in an SCI, which is control information used when transmitting CSI, and when a UE performing channel sensing decodes the SCI and determines channel occupancy, if the corresponding SCI is an SCI for scheduling a PSSCH including only CSI information but not other data, resources occupied or reserved by the corresponding SCI may not be excluded from the resource list. That is, in the channel sensing method, the SCI for scheduling a PSSCH including only CSI information but not other data may be ignored. In one example, when performing channel sensing, Fig.18 UE 1811 receiving a PSSCH including only CSI information may ignore resource occupancy or resource reservation information included in corresponding SCI information (SCI indicating CSI report). Alternatively, during channel sensing, UE 1811 may ignore the corresponding SCI reception itself. This method may be a method in which a receiving UE receives SCI, identifies an indicator indicating whether SL-SCH is included, and then ignores the corresponding scheduling in channel sensing if SL-SCH is not included. The method of ignoring the corresponding scheduling may make it so that when non-transmittable resources are subtracted in the process of determining transmittable resources, SCI is not counted or not considered.

[0519] In the above description, the 1-phase SCI method for decoding one piece of SCI for data reception has been described as a reference, but it may be applied to the 2-phase SCI method for decoding two pieces of SCI for data reception.

[0520] Fig.19 An example of a method for determining a QoS value to be included in control information for scheduling the PSSCH to which the CSI is mapped when CSI information is piggybacked on the PSSCH (i.e., when the CSI information is encoded and mapped using a channel coding method different from that of the SL-SCH) and fed back.

[0521] In operation 1920, the UE 1910 that wants to feed back CSI determines whether the SL-SCH is included in the PSSCH to be transmitted. If the SL-SCH is included therein, in operation 1930, the UE determines the QoS of the SCI based on the QoS of the SL-SCH. If the SL-SCH is not included, in operation 1940, the UE determines the QoS value of the SCI by applying the methods suggested in method y-1 and method y-2. The UE that wants to feed back CSI can determine whether the SL-SCH is included in the PSSCH to be transmitted based on the SL-SCH indicator mapped to the SCI to be transmitted.

[0522] Fig. 20 An example of a method for determining a QoS value to be included in control information for scheduling the PSSCH to which the CSI is mapped when CSI information is sent using a MAC CE sent via a PSSCH (i.e., the SL-SCH is included in the corresponding PSSCH without other data, and the SL-SCH may include the MAC CE to which the CSI is mapped) is shown. In operation 2020, a UE 2010 that wants to feed back CSI determines whether the SL-SCH in the PSSCH to be sent has a QoS value. In operation 2030, if the SL-SCH has a QoS value, the UE determines the QoS of the SCI based on the QoS of the SL-SCH. If the SL-SCH does not include a QoS value, in operation 2040, the UE determines the QoS value of the SCI by applying the methods suggested in method y-1 and method y-2.

[0523] [Fourth embodiment]

[0524] The fourth embodiment provides a method for calculating the number of coded bits after applying channel coding to CSI feedback information, and a method for mapping the coded bits to PSSCH resources when method 1 provided in the second embodiment is applied (i.e., when CSI feedback is mapped to PSSCH resources and is transmitted).

[0525] - When SL-SCH is not included in PSSCH: Number of bits where the sidelink CSI is encoded Q′ SL-CSI It can be calculated as follows.

[0526]

[0527] In the above formula, is the number of resource elements (REs) used for mapping the sidelink CSI feedback information in the PSSCH in the first OFDM symbol, and is the number of symbols (including DMRS symbols) used for PSSCH.

[0528] - When SL-SCH is included in PSSCH: Number of bits where the sidelink CSI is encoded Q′ SL-CSI It can be calculated as follows.

[0529]

[0530] In the above formula, R is the coding rate of PSSCH, Q m is the modulation order, and R and Q can be obtained from the MCS information included in the SCI used to schedule the PSSCH m . is a parameter used to adjust the number of coded bits of the sidelink CSI information and can be determined based on at least one of the resource pool configuration, PC5-RRC configuration, or SCI bit field. SL-CSI is the number of bits of the sidelink CSI feedback information, and L SL-CSI is the number of CRC bits added before channel coding.

[0531] Fig.21 An example of mapping the sidelink CSI to the PSSCH is shown. The PSCCH may include information about the frequency resources and time resources used to schedule the PSCCH. Therefore, upon receiving the PSCCH, the UE may know the resources to which the PSSCH scheduled by the corresponding PSCCH is mapped. In order for the receiving UE to receive the PSSCH as quickly as possible and obtain the sidelink CSI information, the sidelink CSI may be mapped to the earliest region in the time resources among the mapped resources of the PSSCH.

[0532] Fig. 22 Another example of mapping the sidelink CSI to the PSSCH is shown. The PSCCH may include information about the frequency resources and time resources used to schedule the PSCCH. Therefore, upon receiving the PSCCH, the UE may know the resources to which the PSSCH scheduled by the corresponding PSCCH is mapped. In order for the receiving UE to receive the PSSCH as quickly as possible and start data decoding, the sidelink CSI may be mapped to the latest region in the time resources among the mapped resources of the PSSCH.

[0533] [Fifth embodiment]

[0534] The fifth embodiment provides a method and apparatus in which a receiving UE receives a CSI-RS via a side link, measures a channel state, and then determines whether to perform transmission in conjunction with the time of sending CSI feedback information (CSI report information) to a transmitting UE.

[0535] When the receiving UE receives CSI-RS through the side link in time slot n, for example, the receiving UE can start the processing of CSI information generation from time slot n. If it is assumed that the side link CSI report is ready to be sent to the sending UE in time slot n+k (k is a natural number greater than 1), even if the CSI information is ready to be sent, if the resources to be sent through the side link cannot be found, the receiving UE may not send the CSI information. If the receiving UE does not continuously occupy the resources to be sent to the sending UE, the receiving UE cannot send CSI information for a long time, and after a predetermined time, the CSI information may no longer be valid information. Therefore, even if the CSI information is sent after a long time, the sending UE may not need to use the CSI information. (This may be because the information may be meaningless after a long time). Therefore, if a predetermined time has passed after the receiving UE receives the side link CSI-RS, the CSI information obtained from the side link CSI-RS may not be sent, or the operation of discarding the CSI information by the buffer of the receiving UE may be required. To this end, at least one of the following methods can be applied.

[0536] - Method 1: Transmission occurs only at a CSI reporting time point that is fixed in advance, preset in a resource pool, or preset via PC5-RRC, and transmission does not occur except at the set time point. The time point may refer to a time slot or a specific time at which CSI feedback information is sent in response to transmission of a sidelink CSI-RS. That is, after the time point has passed, the UE may discard the CSI generated in the buffer.

[0537] - Method 2: Based on a defined or set duration window, a time interval in which corresponding CSI feedback information should be sent is determined, transmission is allowed only within the time interval, and after the interval has passed, transmission of the corresponding CSI feedback is not allowed.

[0538] -Method 3: A sidelink CSI report valid timer (timer_valid_SL_CSI_reporting) may be introduced, and CSI feedback information (which is the sidelink channel information obtained from the sidelink CSI-RS) may be sent to the sending UE until the sidelink CSI report valid timer expires. That is, after the timer_valid_SL_CSI_reporting timer expires, the CSI feedback information as the sidelink channel information may not be sent to the sending UE. Although the sending UE may send the sidelink CSI-RS to the receiving UE each time a PSSCH transmission occurs, in this case, resources used to send the sidelink CSI-RS are additionally consumed, so resource efficiency may be reduced. Therefore, after sending the sidelink CSI-RS to the receiving UE, if the sidelink CSI feedback information is not sent from the receiving UE until the timer_valid_SL_CSI_reporting timer expires, the sending UE may send the sidelink CSI-RS again after the timer_valid_SL_CSI_reporting timer expires, and a CSI feedback report may be requested.

[0539] [Sixth embodiment]

[0540] The sixth embodiment provides a method and apparatus for mapping information such as control information, feedback information, and CSI in a side link and a transmission channel to a physical channel, and a method and apparatus for applying examples related thereto.

[0541] The information transmitted through the side link may include side link control information (SCI), side link feedback control information (SFCI), side link channel state information (SCSI), and a side link shared channel (SL-SCH) as a transmission channel.

[0542] Information and transport channels can be mapped to physical channels in the following way.

[0543] TrCH (Transport Channel) Physical Channel SL-SCH PSSCH

[0544] Control Information Physical Channel SCI PSCCH SFCI PSFCH SCSI PSSCH

[0545] Alternatively, if SCSI is sent over PSFCH, the following transport channel-physical channel mapping may be applied thereto.

[0546] TrCH (Transport Channel) Physical Channel SL-SCH PSSCH

[0547] Control Information Physical Channel SCI PSCCH SFCI PSFCH SCSI PSSCH, PSFCH

[0548] Alternatively, if the SCSI is sent to a higher layer, for example, to a MAC control element (MAC CE) of a MAC layer corresponding to the SC-SCH, the SCSI may be sent to the PSSCH, to which the following transport channel-physical channel mapping may be applied.

[0549] TrCH (Transport Channel) Physical Channel SL-SCH PSSCH

[0550] Control Information Physical Channel SCI PSCCH SFCI PSFCH SCSI PSSCH, PSFCH

[0551] When the CSI of the sidelink is sent to the MAC CE, the receiving UE may simultaneously send at least one of the following additional information to the transmitting UE.

[0552] - Information about a time slot in which a sidelink CSI-RS used in measuring CSI is transmitted, that is, information about the timing at which the sidelink CSI-RS is transmitted.

[0553] - Information about the frequency domain in which the CSI is measured, that is, information about the frequency domain in which the sidelink CSI-RS is transmitted. This information may include an index of a subchannel, etc.

[0554] - Rank Indicator (RI) and Channel Quality Indicator (CQI) information.

[0555] - Information of the preferred precoding matrix.

[0556] - Preferred beamforming related information.

[0557] -ID information of the receiving UE that has received the sidelink CSI-RS.

[0558] -ID information of the transmitting UE that has transmitted the sidelink CSI-RS.

[0559] -ID information of the sending UE that has sent the sidelink CSI feedback information.

[0560] -ID information of the receiving UE that has received the sidelink CSI feedback information.

[0561] In the present disclosure, although the receiving UE that has received the sidelink CSI-RS and the sending UE that has sent the sidelink CSI feedback information have been described as the same terminal, the present disclosure is not limited to this and can be applied to different terminals. In addition, in the present disclosure, although the sending UE that has sent the sidelink CSI-RS and the receiving UE that has received the sidelink CSI feedback information have been described as the same terminal, the present disclosure is not limited to this and can be applied to different terminals.

[0562] [Seventh embodiment]

[0563] The seventh embodiment provides a method and apparatus for sending side link CSI feedback information through PSFCH.

[0564] The CSI feedback information of the side link in the corresponding resource pool can be configured to be transmitted via PSFCH (e.g., configured to be enabled). In addition, the PSFCH transmission resource can be configured to exist in every N time slots (N>1) instead of in every time slot in the corresponding resource pool. In this case, the timing of sending CSI feedback can be determined as follows.

[0565] -Method 1: A method of sending a CSI feedback report after a specific time (time slot) set for each resource pool after the transmission side link CSI-RS. In this method, if there is a PSFCH resource for transmitting CSI feedback in the time slot, the CSI feedback can be transmitted through the PSFCH, and if there is no PSFCH resource in the corresponding time slot, the CSI feedback can be transmitted through the PSSCH. In the above, for each subcarrier spacing (SCS) set for the resource pool, the specific time (time slot) set for each resource pool after the transmission side link CSI-RS can be defined differently.

[0566] -Method 2: A method of transmitting a CSI feedback report through a PSFCH resource to achieve the fastest transmission after a specific time (time slot) set for each resource pool after the transmission side link CSI-RS. In the above, for each subcarrier spacing (SCS) set for a resource pool, the specific time (time slot) set for each resource pool after the transmission side link CSI-RS can be defined differently.

[0567] Although the first to seventh embodiments of the present disclosure have been described above separately for ease of description, at least two embodiments may be combined because each embodiment includes operations related to each other. In addition, the first to seventh embodiments may be included in Fig.12 or Fig.13 In addition, Figures 1 to 15 Among the configurations, corresponding configurations or operations can be combined with respect to the first to seventh embodiments.

[0568] In order to implement the above-mentioned embodiments of the present disclosure, Fig.23 and Fig.24 The transmitter, receiver and processor of the UE and the base station are shown respectively. Fig.23 and Fig.24The device configuration of the UE and the base station is shown for executing a method for sending side link control information (which includes whether to send CSI-RS, whether to report CSI information, and whether to include SL-SCH), a method for determining the size of CSI feedback, a method for configuring scheduling information of PSSCH, a method for applying channel coding to CSI feedback information and a mapping method thereof, and a method for mapping feedback information and CSI information to physical channels.

[0569] Specifically, Fig.23 is a block diagram showing the internal structure of a UE according to an embodiment of the present disclosure. Fig.23 As shown, the UE of the present disclosure may include a UE receiver 2300, a UE transmitter 2304, and a UE processor 2302. In an embodiment of the present disclosure, the UE receiver 2300 and the UE transmitter 2304 are collectively referred to as a transceiver. The transceiver may send a signal to / receive a signal from a base station. The signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplifying the received signal and down-converting its frequency. In addition, the transceiver may receive a signal via a radio channel and output the received signal to the UE processor 2302, and may send a signal output from the UE processor 2302 via a radio channel. The UE processor 2302 may control a series of processes so that the UE operates according to the above-mentioned embodiment. For example, the UE receiver 2300 may receive control information from the base station, and the UE processor 2302 may determine feedback information and whether to send side link CSI feedback based on the control information and pre-configured configuration information, thereby preparing for transmission based on it. Thereafter, the UE transmitter 1604 may send the scheduled feedback to the base station. Both the sending UE and the receiving UE may have Fig.23 The structure shown. The sending UE may be referred to as the first UE, and the receiving UE may be defined as the second UE.

[0570] According to an embodiment of the present disclosure, in a first terminal, the UE processor 2302 may perform control to acquire channel state information (CSI), send a physical sidelink control channel (PSCCH) including sidelink control information (SCI) to a second terminal via a transceiver, and send a physical sidelink shared channel (PSSCH) including CSI and data received from a higher layer to the second terminal via a transceiver. The SCI includes quality of service (QoS) information and mapping information about the CSI and data, and the QoS information may be determined based on whether the CSI is sent via the PSSCH. In addition, the QoS includes a priority value, which may be determined based on the priority of the data and whether the CSI is sent, and the CSI may be sent in the format of a media access control (MAC) control element. The QoS information may indicate that the transmission of the PSSCH including the CSI has a higher priority than the transmission of other PSSCHs not including the CSI, and a preset value may be used as the priority of the CSI.

[0571] According to an embodiment of the present disclosure, in the second terminal, the UE processor 2302 may perform control to send a channel state information (CSI) reference signal (RS) to the first terminal via a transceiver, receive a physical sidelink control channel (PSCCH) including sidelink control information (SCI) from the first UE via the transceiver, and based on the SCI, receive a physical sidelink shared channel (PSSCH) including CSI and data from the first UE via the transceiver. The SCI includes quality of service (QoS) information and mapping information about CSI and data, and the QoS information may be determined based on whether the CSI is sent via the PSSCH. In addition, the QoS includes a priority value, which may be determined based on the priority of the data and whether the CSI is sent, and the CSI may be received in the format of a media access control (MAC) control element. The QoS information may indicate that the transmission of the PSSCH including the CSI has a higher priority than the transmission of other PSSCHs not including the CSI, and a preset value may be used as the priority of the CSI.

[0572] Fig.24 is a block diagram showing the internal structure of a base station according to an embodiment of the present disclosure. Fig.24As shown, the base station of the present disclosure may include a base station receiver 2401, a base station transmitter 2405 and a base station processor 2403. In an embodiment of the present disclosure, the base station receiver 2401 and the base station transmitter 2405 may be collectively referred to as a transceiver. The transceiver may send signals to / receive signals from the UE. The signal may include control information and data. To this end, the transceiver may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplifying the received signal and down-converting its frequency. In addition, the transceiver may receive a signal through a radio channel and output the received signal to the base station processor 2403, and send a signal output from the base station processor 2403 through a radio channel. The base station processor 2403 may control a series of processes so that the base station performing the side link operation may operate according to the above-mentioned embodiments of the present disclosure. For example, a base station or a roadside unit (RSU) may perform the operation of sending a UE or receiving a UE in a side link communication, and in this case, the structure of the base station and the RSU may have Fig.24 structure.

[0573] The embodiments of the present disclosure described and shown in the specification and the drawings are intended to easily explain the technical content of the present disclosure and help understand the present disclosure, rather than to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other modifications and changes can be made to the present disclosure based on the technical spirit of the present disclosure. In addition, the above-mentioned various embodiments can be used in combination as needed. In addition, based on the technical ideas of the embodiments, other variations of the embodiments can be implemented in LTE systems, 5G systems, etc.

Claims

1. A method performed by a first terminal in a wireless communication system, the method comprising: Obtain channel state information CSI; Sending side link control information SCI to the second terminal on a physical side link control channel PSCCH; as well as Sending a medium access control MAC control element CE including the CSI to the second terminal on a physical sidelink shared channel PSSCH, wherein the preset value is used as the priority of the MAC CE including the CSI, and The SCI includes priority information determined based on the preset value.

2. The method according to claim 1, in, The data received from the higher layer of the first terminal is transmitted to the second terminal through the PSSCH together with the MAC CE including the CSI, wherein the SCI includes scheduling information for the data and the MAC CE, and The priority information is determined based on the priority of the data and the preset value.

3. The method according to claim 1, wherein: The lowest value is used as the preset value for the MAC CE including the CSI.

4. The method according to claim 1, wherein: The transmission of a MAC CE including CSI has a higher priority than the transmission of data not including CSI.

5. A first terminal of a wireless communication system, the first terminal comprising: Transceiver; as well as The controller is configured as: Get channel state information CSI, sending sidelink control information SCI to the second terminal on a physical sidelink control channel PSCCH, and Sending a medium access control MAC control element CE including the CSI to the second terminal on a physical sidelink shared channel PSSCH, wherein the preset value is used as the priority of the MAC CE including the CSI, and The SCI includes priority information determined based on the preset value.

6. The first terminal according to claim 5, in, The data received from the higher layer of the first terminal is transmitted to the second terminal through the PSSCH together with the MAC CE including the CSI, wherein the SCI includes scheduling information for the data and the MAC CE, and The priority is determined based on the priority of the data and the preset value.

7. The first terminal according to claim 5, wherein: The lowest value is used as the preset value for the MAC CE including the CSI.

8. The first terminal according to claim 5, wherein: The transmission of MAC CE including CSI has a higher priority than the transmission of data not including CSI.

9. A method performed by a second terminal in a wireless communication system, the method comprising: Sending a channel state information CSI-reference signal RS to the first terminal; Receiving sidelink control information SCI from the first terminal on a physical sidelink control channel PSCCH; as well as Based on the SCI, receiving a medium access control MAC control element CE including the CSI from the first terminal on a physical sidelink shared channel PSSCH, wherein the preset value is used as the priority of the MAC CE including the CSI, and The SCI includes priority information determined based on the preset value.

10. The method according to claim 9, in, The data received from the higher layer of the first terminal is transmitted to the second terminal through the PSSCH together with the MAC CE including the CSI, wherein the SCI includes scheduling information for the data and the MAC CE, and The priority information is determined based on the priority of the data and the preset value.

11. The method according to claim 9, wherein: The lowest value is used as the preset value for the MAC CE including the CSI.

12. The method according to claim 9, wherein: The transmission of MAC CE including CSI has a higher priority than the transmission of data not including CSI.

13. A second terminal of a wireless communication system, the second terminal comprising: Transceiver; as well as The controller is configured as: Sending a channel state information CSI-reference signal RS to the first terminal via a transceiver, receiving sidelink control information SCI from the first terminal on a physical sidelink control channel PSCCH, and Based on the SCI, receiving a medium access control MAC control element CE including the CSI from the first terminal on a physical sidelink shared channel PSSCH, wherein the preset value is used as the priority of the MAC CE including the CSI, and The SCI includes priority information determined based on the preset value.

14. The second terminal according to claim 13, in, The data received from the higher layer of the first terminal is transmitted to the second terminal through the PSSCH together with the MAC CE including the CSI, wherein the SCI includes scheduling information for the data and the MAC CE, and The priority is determined based on the priority of the data and the preset value.

15. The second terminal according to claim 13, wherein: The lowest value is used as the preset value for the MAC CE including the CSI.

16. The second terminal according to claim 13, in, The transmission of MAC CE including CSI has a higher priority than the transmission of data not including CSI.

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