WO2020032665A1 - Method and apparatus for transmitting and receiving sidelink signal in wireless cellular communication system - Google Patents

Abstract

Disclosed are a communication technique and a system thereof that fuses, with an IoT technology, a 5G communication system for supporting a higher data transmission rate than that of a 4G system. The present disclosure may be applied to intelligent services, such as smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, and security and safety related services, on the basis of 5G communication technology and IoT-related technologies. The present disclosure relates to a transmission method of a terminal comprising: a step of determining a simultaneous transmission of first and second communication-based sidelink signals; a step of determining a priority of the first and second communication-based sidelink signals when the simultaneous transmission is set; and a step of processing the first and second communication-based sidelink signals on the basis of the priority.

Description

Method and apparatus for transmitting / receiving sidelink signal in wireless cellular communication system

The present invention relates to a wireless communication system, and relates to a data transmission and reception method and apparatus in a side link. More specifically, the present invention relates to a method for transmitting and receiving prioritized signals by setting priorities of the same long term evolution (LTE) and new radio (NR) V2X (vehicle to everything) signals during sidelink transmission. .

In order to meet the increasing demand for wireless data traffic since the commercialization of 4G communication system, efforts are being made to develop an improved 5G communication system or a pre-5G communication system. For this reason, a 5G communication system or a pre-5G communication system is called a Beyond 4G network communication system or a post LTE system. In order to achieve high data rates, 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (eg, such as the 60 Gigabit (60 GHz) band). In 5G communication system, beamforming, massive array multiple input / output (Full-Dimensional MIMO), and full dimensional multiple input / output (FD-MIMO) are used in 5G communication system to increase path loss mitigation of radio waves and increase transmission distance of radio waves. Array antenna, analog beam-forming, and large scale antenna techniques are discussed. In addition, in order to improve the network of the system, 5G communication systems have advanced small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network (ultra-dense network) , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation And other technology developments are being made. In addition, in 5G systems, Hybrid FSK and QAM Modulation (FQAM) and sliding window superposition coding (SWSC), Advanced Coding Modulation (ACM), and FBMC (Filter Bank Multi Carrier) and NOMA are advanced access technologies. (non orthogonal multiple access), and sparse code multiple access (SCMA) are being developed.

Meanwhile, the Internet is evolving from a human-centered connection network where humans create and consume information, and an Internet of Things (IoT) network that exchanges and processes information between distributed components such as things. Internet of Everything (IoE) technology, in which big data processing technology through connection with cloud servers and the like, is combined with IoT technology, is also emerging. In order to implement the IoT, technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between things, a machine to machine , M2M), Machine Type Communication (MTC), etc. are being studied. In an IoT environment, intelligent Internet technology (IT) services that provide new value in human life by collecting and analyzing data generated from connected objects may be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliances, advanced medical services, etc. through convergence and complex of existing information technology (IT) technology and various industries. It can be applied to.

Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as sensor network, machine to machine (M2M) and machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antenna, which are 5G communication technologies. will be. The application of cloud radio access network (cloud RAN) as the big data processing technology described above may be an example of convergence of 5G technology and IoT technology.

On the other hand, the new 5G communication NR (New Radio access technology) is designed to allow various services to be freely multiplexed in time and frequency resources. Accordingly, waveform / numerology and reference signals are dynamically changed according to the needs of the corresponding service. Can be assigned freely. In order to provide an optimal service to a terminal in wireless communication, optimized data transmission by measuring channel quality and interference amount is important. Therefore, accurate channel state measurement is essential. However, unlike 4G communication, in which channel and interference characteristics do not change significantly according to frequency resources, the frequency and interference characteristics of 5G channels vary greatly depending on the service, so the frequency resource group (FRG) can be divided and measured. Requires support for a subset of. On the other hand, in the NR system, the types of supported services can be divided into categories such as Enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (mMTTC), and Ultra-Reliable and Low-latency Communications (URLLC). eMBB is high speed data transmission, mMTC is terminal service minimization and access of many terminals, and URLLC is high reliability and low latency service. Different requirements may be applied depending on the type of service applied to the terminal.

On the other hand, as the research on the next-generation communication system is in progress, various methods for scheduling communication with the terminal have been discussed. Accordingly, there is a need for an efficient scheduling and data transmission / reception scheme considering the characteristics of the next generation communication system.

As described above, a plurality of services may be provided to a user in a communication system, and in order to provide the plurality of services to a user, a method and an apparatus using the same may be provided in accordance with characteristics in the same time period. .

A wireless communication system, in particular, a terminal to communicate in a sidelink for communication between the terminal and the terminal, may be a terminal having a function of transmitting and receiving sitelink signals based on LTE and NR. This may be that LTE and NR-based sidelink signal transmission and reception are simultaneously activated. In this case, the terminal should determine whether to transmit and receive the LTE-based sidelink signal and the NR-based sidelink signal based on a specific time and frequency. For example, this may be performed based on a setting from a base station, based on a previously promised order, or based on a priority of a packet to be transmitted / received. Accordingly, an embodiment of the present invention provides a method and apparatus for setting a priority between LTE and NR by a terminal having an LTE and NR-based sidelink signal transmission / reception function and performing sidelink transmission and reception based on the priority.

According to an embodiment of the present invention, in the transmission method of the terminal, determining the simultaneous transmission of the first communication-based sidelink signal and the second communication-based sidelink signal, if the simultaneous transmission is set, the first communication based Determining a priority of a sidelink signal and the second communication-based sidelink signal and processing the first communication-based sidelink signal and the second communication-based sidelink signal based on the priority. Can be provided.

In addition, according to an embodiment of the present invention, in the terminal, it is connected to the transceiver, the transceiver, and determines the simultaneous transmission of the first communication-based sidelink signal and the second communication-based sidelink signal, the simultaneous transmission is When set, the priority of the first communication based sidelink signal and the second communication based sidelink signal is determined, and based on the priority, the first communication based sidelink signal and the second communication based sidelink signal are determined. It is possible to provide a terminal including a control unit for controlling to process.

According to an embodiment of the present invention, a sidelink transmission / reception method may be provided.

In addition, according to an embodiment of the present invention, the terminal having the LTE and NR-based sidelink signal transmission / reception functions may set a priority to determine a signal and a physical channel to transmit / receive and perform data transmission and reception accordingly.

1 is a diagram illustrating a downlink or uplink time-frequency domain transmission structure of an NR system according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating data for enhanced mobile broadband (eMBB), ultra-reliable and low-latency communications (URLLC), and massive machine type communications (MMTC) in a communication system according to an embodiment of the present invention. This figure is shown.

3 is a diagram illustrating a state in which data for eMBB, URLLC, and mMTC are allocated in frequency-time resources in a communication system according to an embodiment of the present invention.

FIG. 4 is a diagram illustrating a structure in which one transport block is divided into several code blocks and a cyclic redundancy check (CRC) is added according to an embodiment of the present invention.

5 is a diagram illustrating a structure in which an outer code is applied and coded according to an embodiment of the present invention.

6 is a block diagram illustrating whether outer code is applied according to an embodiment of the present invention.

FIG. 7 is a diagram illustrating a structure in which one transport block is divided into several code blocks and an outer code is applied to generate a parity code block according to an embodiment of the present invention.

8 illustrates an example of group casting in which one terminal transmits common data to a plurality of terminals according to an embodiment of the present invention.

FIG. 9 is a diagram illustrating a process in which terminals receiving common data through group casting transmit information related to success or failure of data reception to a terminal transmitting data.

FIG. 10 is a view illustrating mapping signals in frequency and time domains of synchronization signals and a physical broadcast channel (PBCH) of a 3GPP NR system according to an embodiment of the present invention.

FIG. 11 is a diagram illustrating which symbols are mapped to one SS / PBCH block according to an embodiment of the present invention.

FIG. 12 is a diagram illustrating which symbols can transmit an SS / PBCH block to symbols within 1 ms according to an embodiment of the present invention according to a subcarrier spacing.

FIG. 13 is a diagram illustrating which slots and symbols within 5ms can be transmitted according to subcarrier spacing according to an embodiment of the present invention.

FIG. 14A is a flowchart illustrating a method for determining which sidelink signal is to be transmitted or received by a UE having both an LTE-based sidelink signal transceiving function and an NR-based sidelink signal transceiving function according to an embodiment of the present invention. One drawing.

14B is a diagram illustrating a slot structure including a PSFCH according to an embodiment of the present invention.

14C illustrates a slot structure including a PSFCH according to an embodiment of the present invention.

14D illustrates a slot structure including a PSFCH according to an embodiment of the present invention.

FIG. 15 illustrates an example in which sidelink control information (SCI) transmitted on an NR physical sidelink control channel (NR-PSCCH) that is a control channel according to an embodiment of the present invention schedules the NR-PSSCH.

16 is a diagram illustrating an SCI transmission operation of a sidelink transmitting terminal according to 5QI configuration information.

17 is a diagram illustrating an SCI reception operation of a sidelink receiving terminal according to 5QI configuration information.

18 is a diagram illustrating a configuration of a terminal according to embodiments of the present invention.

19 is a diagram illustrating a configuration of a base station according to embodiments of the present invention.

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

In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present invention belongs and are not directly related to the present invention will be omitted. This is to more clearly communicate without obscure the subject matter of the present invention by omitting unnecessary description.

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

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various different forms, and the present embodiments are only provided to complete the disclosure of the present invention and to provide general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

At this time, it will be understood that each block of the flowchart illustrations and combinations of flowchart illustrations may be performed by computer program instructions. Since these computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, those instructions executed through the processor of the computer or other programmable data processing equipment may be described in flow chart block (s). It will create means to perform the functions. These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block (s). Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions for performing the processing equipment may also provide steps for performing the functions described in the flowchart block (s).

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

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

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

As a representative example of the broadband wireless communication system, a downlink (DL) and an orthogonal frequency division multiplexing (OFDM) scheme are adopted in the NR system. More specifically, in the downlink, a cyclic-prefix OFDM (CP-OFDM) scheme is adopted, and in the uplink, two types of the discrete Fourier transform spreading OFDM (DFT-S-OFDM) schemes are used in addition to the CP-OFDM. The uplink refers to a radio link through which a user equipment (UE), a mobile station (MS), or a terminal (MS) transmits data or control signals to a base station (gNode B, a base station (BS), or gNB), and a downlink. The link refers to a radio link through which a base station transmits data or a control signal to a terminal. In the multiple access scheme as described above, data or control information of each user is classified by assigning and operating such that time-frequency resources for carrying data or control information for each user do not overlap each other, that is, orthogonality is established. do.

The NR system adopts a hybrid automatic repeat request (HARQ) scheme in which the data is retransmitted in the physical layer when a decoding failure occurs in the initial transmission. In the HARQ scheme, when the receiver does not correctly decode (decode) the data, the receiver transmits NACK (Negative Acknowledgement) informing the transmitter of the decoding failure, so that the transmitter can retransmit the corresponding data in the physical layer. The receiver combines the data retransmitted by the transmitter with previously decoded data to improve the data reception performance. In addition, when the receiver correctly decodes the data, the transmitter may transmit an acknowledgment (ACK) indicating the decoding success to the transmitter so that the transmitter may transmit new data.

Hereinafter, the base station is a subject performing resource allocation of the terminal, and is at least one of a gNode B (gNB), an eNode B (eNB), a Node B, a BS (Base Station), a radio access unit, a base station controller, or a node on a network. Can be. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In the present invention, downlink (DL) is a radio transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) is a radio transmission path of a signal transmitted from a terminal to a base station. In addition, the following describes an embodiment of the present invention using the NR system as an example, but the embodiment of the present invention may be applied to other communication systems having a similar technical background or channel form. In addition, the embodiment of the present invention may be applied to other communication systems through some modifications within the scope of the present invention without departing from the scope of the present invention by the judgment of those skilled in the art.

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

In the present invention, higher layer signaling is a signal transmission method delivered from a base station to a terminal using a downlink data channel of a physical layer or from a terminal to a base station using an uplink data channel of a physical layer. It may also be referred to as a signaling or MAC control element (CE).

1 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource region in which the data or control channel is transmitted in downlink or uplink in an NR system according to an embodiment of the present invention.

In FIG. 1, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The minimum transmission unit in the time domain is an OFDM symbol, and N _symb (1-02) OFDM symbols are combined to form one slot (1-06). The length of the subframe is defined as 1.0 ms, and the radio frame 1-14 is defined as 10 ms. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth consists of N _BW (1-04) subcarriers in total.

The basic unit of resource in the time-frequency domain may be represented by an OFDM symbol index and a subcarrier index as a resource element (RE). The resource block (1-08, Resource Block; RB or PRB) includes N _symb (1-02) consecutive OFDM symbols in the time domain and N _RB (1-10) consecutive subcarriers in the frequency domain. Is defined as Therefore, one RB (1-08) is composed of N _symb x N _RB REs. In general, the minimum transmission unit of data is the RB unit. In an NR system, N _symb = 14 and N _RB = 12, and N _BW and N _RB are proportional to the bandwidth of the system transmission band. A data rate may increase in proportion to the number of RBs scheduled to the terminal. In the NR system, in the case of a frequency division duplex (FDD) system in which downlink and uplink are divided into frequencies, the downlink transmission bandwidth and the uplink transmission bandwidth may be different. The channel bandwidth represents a radio frequency (RF) bandwidth corresponding to the system transmission bandwidth. Table 1-01 and Table 1-02 show the correspondence between system transmission bandwidth, subcarrier spacing and channel bandwidth defined for NR systems in frequencies below 6 GHz and above 6 GHz, respectively. Represents part of a relationship For example, an NR system with a 100 MHz channel bandwidth of 30 kHz subcarrier width has a transmission bandwidth of 273 RBs. In the following, N / A may be a bandwidth-subcarrier combination that is not supported by the NR system.

TABLE 1-01

Table 1-02

In the NR system, scheduling information on downlink data or uplink data is transmitted from the base station to the terminal through downlink control information (DCI). DCI is defined according to various formats, and according to each format, whether or not scheduling information (uplink grant, UL grant) for uplink data or scheduling information (downlink grant, DL grant) for downlink data and size of control information according to each format Is a small compact DCI, whether to apply spatial multiplexing using multiple antennas, whether or not the DCI for power control. 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.

Carrier indicator: indicates on which frequency carrier to transmit.

DCI format indicator: This indicator distinguishes whether the corresponding DCI is for downlink or uplink.

Bandwidth part (BWP) indicator: indicates which BWP is transmitted.

Frequency domain resource allocation: indicates an RB of a frequency domain allocated to data transmission. The resource to be expressed is determined by the system bandwidth and the resource allocation method.

Time Domain Resource Allocation: Indicate in which OFDM symbol of which slot a data related channel is to be transmitted.

VRB-to-PRB mapping: Indicate how to map a virtual RB (VRB) index and a physical RB (PRB) index.

Modulation and coding scheme (MCS): Indicate the modulation scheme and coding rate used for data transmission. That is, a coding rate value capable of informing TBS and channel coding information may be indicated along with information on whether QPSK, 16QAM, 64QAM, or 256QAM.

Codeblock group transmission information: When CBG retransmission is set, it indicates information about which CBG is transmitted.

HARQ process number: indicates a process number of HARQ.

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

-Redundancy version: indicates a redundant version of HARQ.

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

In the case of the physical uplink shared channel (PUSCH) transmission, the time domain resource assignment includes information about a slot on which the PUSCH is transmitted and a start symbol position S in the corresponding slot and the number of symbols L to which the PUSCH is mapped. Can be delivered by In the above, S may be a relative position from the beginning of the slot, L may be the number of consecutive symbols, and S and L may be determined from a start and length indicator value (SLIV) defined as follows. .

else

In an NR system, a table including information on a SLIV value, a PUSCH mapping type, and a slot on which a PUSCH is transmitted may be set in one row through radio resource control (RRC) configuration. Subsequently, in the time domain resource allocation of the DCI, the BS may transmit information on the SLIV value, the PUSCH mapping type, and the slot on which the PUSCH is transmitted to the UE by indicating the index value in the set table.

In the NR system, PUSCH mapping types are defined by type A and type B. In PUSCH mapping type A, a first symbol of a demodulation reference signal (DMRS) symbol is located in a second or third OFDM symbol of a slot. In PUSCH mapping type B, the first symbol of the DMRS symbol is located in the first OFDM symbol in the time-domain resource allocated to PUSCH transmission.

The DCI may be transmitted on a physical downlink control channel (PDCCH) (or control information, hereinafter to be used interchangeably) which is a downlink physical control channel through channel coding and modulation.

In general, the DCI is scrambled with a specific Radio Network Temporary Identifier (RNTI) (or UE identifier) independently for each UE, and a cyclic redundancy check (CRC) is added, and after channel coding, each DCP is composed of independent PDCCHs. Is sent. The PDCCH is mapped and transmitted in a control resource set (CORESET) set for the UE.

The downlink data may be transmitted on a physical downlink shared channel (PDSCH) which is a physical channel for downlink data transmission. PDSCH may be transmitted after the control channel transmission interval, and scheduling information such as specific mapping positions and modulation schemes in the frequency domain is determined based on the DCI transmitted through the PDCCH.

Of the control information constituting the DCI through the MCS, the base station notifies the modulation scheme applied to the PDSCH to be transmitted and the transport block size (TBS) of the data to be transmitted. In an embodiment, the MCS may consist of 5 bits or more or fewer bits. The TBS corresponds to a size before channel coding for error correction is applied to data (transport block, TB) that the base station intends to transmit.

In the present invention, a transport block (TB) may include a medium access control (MAC) header, a MAC control element (CE), at least one MAC service data unit (SDU), and padding bits. Can be. Alternatively, TB may indicate a unit of data or a MAC Protocol Data Unit (MAP PDU) that falls from the MAC layer to the physical layer.

The modulation schemes supported by the NR system are Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (16QAM), 64QAM, and 256QAM, and each modulation order (Qm) corresponds to 2, 4, 6, and 8. do. That is, 2 bits per symbol for QPSK modulation, 4 bits per symbol for 16QAM modulation, 6 bits per symbol for 64QAM modulation, and 8 bits per symbol for 256QAM modulation.

2 and 3 illustrate a state in which data for eMBB, URLLC, and mMTC, which are services considered in a 5G or NR system, according to an embodiment of the present invention are allocated in frequency-time resources.

2 and 3, it can be seen how frequency and time resources are allocated for information transmission in each system.

First, in FIG. 2, data for eMBB, URLLC, and mMTC are allocated in the entire system frequency band 2-00. When eMBB (2-01) and mMTC (2-09) are allocated and transmitted in a specific frequency band and URLLC data (2-03, 2-05, 2-07) occurs and transmission is necessary, eMBB (2- 01) and mMTC (2-09) can transmit URLLC data (2-03, 2-05, 2-07) without emptying the allocated portion or without transmitting. Since the URLLC of the service needs to reduce the delay time, URLLC data may be allocated (2-03, 2-05, 2-07) to a part of the resource 2-01 to which the eMBB is allocated, and then transmitted. Of course, when URLLC is additionally allocated and transmitted in the resource to which the eMBB is allocated, the eMBB data may not be transmitted in the overlapping frequency-time resource, and thus transmission performance of the eMBB data may be lowered. That is, in the above case, eMBB data transmission failure due to URLLC allocation may occur.

In FIG. 3, the entire system frequency band 3-00 may be divided and used to transmit service and data in each subband 3-02, 3-04, and 3-06. Information related to the subband configuration may be predetermined, and this information may be transmitted by the base station to the terminal through higher layer signaling. Alternatively, the information related to the subbands may be arbitrarily divided by the base station or the network node to provide services to the terminal without transmitting subband configuration information. In FIG. 3, subband 3-02 is used for eMBB data transmission, subband 3-04 is URLLC data transmission, and subband 306 is used for mMTC data transmission.

In the overall embodiment, the length of a transmission time interval (TTI) used for URLLC transmission may be shorter than the length of TTI used for eMBB or mMTC transmission. In addition, the response of the information related to the URLLC can be sent faster than eMBB or mMTC, thereby transmitting and receiving information with a low delay. The structure of the physical layer channel used for each type to transmit the three types of services or data may be different. For example, at least one of a length of a transmission time interval (TTI), an allocation unit of frequency resources, a structure of a control channel, and a data mapping method may be different.

In the above description, three types of services and three types of data are described, but more types of services and corresponding data may exist. In this case, the contents of the present invention may be applied.

In order to describe the method and apparatus proposed in the embodiment, the terms physical channel and signal in the NR system may be used. However, the subject matter of the present invention can be applied in a wireless communication system rather than an NR system.

4 is a diagram illustrating a process in which one transport block is divided into several code blocks and a CRC is added according to an embodiment of the present invention.

Referring to FIG. 4, one transport block (TB) to be transmitted in the uplink or the downlink may be added with a CRC 4-03 at the end or the beginning. The CRC 4-03 may have 16 bits or 24 bits or a fixed number of bits, or a variable number of bits depending on channel conditions, and may be used to determine whether channel coding is successful. The block in which the CRC (4-03) is added to the TB (4-01) is divided into several codeblocks (CBs) (4-07, 4-09, ..., 4-11, 4-13). Can be divided (4-05). The code blocks 4-07, 4-09, ..., 4-11, and 4-13 may be divided by predetermined maximum sizes, in which case the last code block 4-13 is larger than other code blocks. May be small, or 0, a random value, or 1 may be set to be the same length as other code blocks. CRCs 4-17, 4-19,..., 4-21, and 4-23 may be added to the divided code blocks, respectively (4-15). The CRC (4-17, 4-19, ..., 4-21, 4-23) may have 16 bits or 24 bits or a fixed number of bits, and may determine whether channel coding is successful. Can be used.

에 대해, CRC

는

를 상기 g_CRC24A(D)로 나누어 나머지가 0이 되는 값으로

를 결정할 수 있다. 상기에서 CRC 길이 L은 24인 일례로 설명하였지만 상기 길이는 12, 16, 24, 32, 40, 48, 64 등 여러 가지 길이로 결정 될 수 있을 것이다. 상기 과정으로 TB에 CRC를 추가 후, N개의 CB로 분할한다(4-07, 4-09, 4-11, 4-13). 분할된 각각의 CB들(4-07, 4-09, 4-11, 4-13)에 CRC(4-17, 4-19, 4-21, 4-23)가 추가된다(4-15). 상기 CB(4-07, 4-09, 4-11, 4-13)에 추가되는 CRC(4-17, 4-19, 4-21, 4-23)는 TB에 추가된 CRC를 발생할 때와는 다른 길이의 CRC 혹은 다른 cyclic generator polynomial이 사용될 수 있다. 하지만 상기 TB에 추가된 CRC(4-03)과 코드블록에 추가된 CRC들(4-17, 4-19, 4-21, 4-23)은 코드블록에 적용될 채널코드의 종류에 따라 생략될 수도 있다. 예를 들어, 터보코드가 아니라 LDPC 코드가 코드블록에 적용될 경우, 코드블록마다 삽입될 CRC들(4-17, 4-19, 4-21, 4-23)은 생략될 수도 있을 것이다. 하지만, LDPC가 적용되는 경우에도 CRC들(4-17, 4-19, 4-21, 4-23)은 그대로 코드블록에 추가될 수 있다. 또한 폴라 코드가 사용되는 경우에도 CRC가 추가되거나 생략 될 수 있다. TB (4-01) and a cyclic generator polynomial may be used to generate the CRC (4-03), and the cyclic generator polynomial may be defined in various ways. For example, a cyclic generator polynomial g _CRC24A (D) for a 24-bit CRC = D ²⁴ + D ²³ + D ¹⁸ + D ¹⁷ + D ¹⁴ + D ¹¹ + D ¹⁰ + D ⁷ + D ⁶ + D ⁵ + D ⁴ Assume that + D ³ + D + 1, and when L = 24, TB data

For, CRC

Is

_Divided by g _CRC24A (D) to a value where the remainder becomes 0

Can be determined. Although the CRC length L has been described as an example of 24, the length may be determined in various lengths such as 12, 16, 24, 32, 40, 48, and 64. In the above process, CRC is added to TB and then divided into N CBs (4-07, 4-09, 4-11, and 4-13). CRC (4-17, 4-19, 4-21, 4-23) is added to each of the divided CBs (4-07, 4-09, 4-11, 4-13) (4-15) . CRC (4-17, 4-19, 4-21, 4-23) added to the CB (4-07, 4-09, 4-11, 4-13) is the same as when generating CRC added to TB Different lengths of CRC or other cyclic generator polynomials can be used. However, the CRC (4-03) added to the TB and the CRCs (4-17, 4-19, 4-21, 4-23) added to the code block may be omitted depending on the type of channel code to be applied to the code block. It may be. For example, when LDPC codes other than turbo codes are applied to code blocks, CRCs 4-17, 4-19, 4-21, and 4-23 to be inserted for each code block may be omitted. However, even when LDPC is applied, CRCs 4-17, 4-19, 4-21, and 4-23 may be added to a code block as it is. In addition, CRC may be added or omitted even when polar codes are used.

As shown in FIG. 4, the maximum length of one code block is determined according to the type of channel coding applied to the TB to be transmitted, and the CRC added to the TB and TB is code code according to the maximum length of the code block. The division of is performed. In a conventional LTE system, a CRC for a CB is added to the divided CB, data bits of the CB and a CRC are encoded in a channel code, and coded bits are determined, and each coded bit is previously determined. Likewise, the number of bits that are rate matched is determined.

5 is a diagram illustrating a method of transmitting and using an outer code according to an embodiment of the present invention, and FIG. 6 is a block diagram illustrating a structure of a communication system using the outer code.

5 and 6, a method of transmitting a signal using an outer code may be described.

FIG. 5 illustrates that a transport block is divided into several code blocks, and then bits or symbols (5-04) at the same position in each code block are encoded with a second channel code, thereby parity bits or symbols. (5-06) may be generated (5-02). Thereafter, CRCs may be added to the respective code blocks and the parity code blocks generated by the second channel code encoding (5-08 and 5-10). The addition of the CRC may vary depending on the type of channel code. For example, when the turbo code is used as the first channel code, the CRCs (5-08 and 5-10) are added, but each code block and parity code blocks may be encoded by the first channel code encoding. have. In the present invention, the first channel code may be a convolutional code, an LDPC code, a turbo code, a polar code, or the like. However, the present invention is not limited thereto, and the present invention may be applied to various channel codes. In the present invention, the second channel code may be, for example, a Reed-solomon code, a BCH code, a Raptor code, a parity bit generation code, or the like. However, the present invention is not limited thereto, and various channel codes become second channel codes.

When the outer code is used (Fig. 6 (b)), the data to be transmitted passes through the second channel coding encoder 6-09. The bits or symbols passing through the second channel coding encoder 6-09 pass through the first channel coding encoder 6-11. When the channel-coded symbols are received by the receiver through the channel 6-13, the receiver performs the first channel coding decoder 6-15 and the second channel coding decoder 6-17 based on the received signal. Can be operated sequentially. The first channel coding decoder 6-15 and the second channel coding decoder 6-17 perform operations corresponding to the first channel coding encoder 6-11 and the second channel coding encoder 6-09, respectively. can do.

On the other hand, in the channel coding block diagram in which the outer code is not used (Fig. 6 (a)), only the first channel coding encoder 6-01 and the first channel coding decoder 6-05 are used in the transceiver, and the second channel is used. The coding encoder and the second channel coding decoder are not used. Even when the outer code is not used, the first channel coding encoder 6-01 and the first channel coding decoder 6-05 may be configured in the same manner as when the outer code is used.

FIG. 7 illustrates an example in which one or more parity code blocks are generated by applying a second channel code or an outer code after one transport block is divided into several code blocks according to an embodiment of the present invention. . As described in FIG. 4, one transport block 7-02 is divided into one or more code blocks 7-08, 7-10, 7-12, and 7-14. In this case, when only one code block is generated according to the transport block size, the CRC may not be added to the corresponding code block. When the outer code is applied to the code blocks to be transmitted, parity code blocks 7-40 and 7-42 are generated (7-24). When using an outer code, parity code blocks 7-40 and 7-42 are located after the last code block 7-22 (7-24). After the outer code, the CRCs (7-26, 7-28, 7-30, 7-32, 7-34, 7-36) are replaced with code blocks (7-16, 7-18, 7-20, 7-22). 7-40) and parity code blocks 7-40 and 7-42 (7-38). Each code block and parity code block can then be encoded with a channel code along with the CRC.

The following embodiment provides a method and apparatus for performing data transmission and reception by applying an outer code between a base station and a terminal or a terminal. In this case, data may be transmitted from one terminal to a plurality of terminals, or data may be transmitted from one terminal to one terminal. Alternatively, the data may be transmitted from the base station to the plurality of terminals. However, the present invention is not limited thereto and may be applied in various cases.

8 is a group casting in which one terminal 8-01 transmits common data to a plurality of terminals 8-03, 8-05, 8-07, and 8-09 according to an embodiment of the present invention. It is a figure which shows an example of (8-11). The terminal 8-01 may be a terminal moving with the vehicle. Separate control information, a physical control channel, and data transmission may be performed for the group casting 8-11.

9 is a diagram illustrating information regarding success or failure of data reception by terminals 9-03, 9-05, 9-07, and 9-09 that have received common data through group casting according to an embodiment of the present invention. Is a diagram illustrating a process of transmitting to the terminal 9-01 which has transmitted the message. The information may be information such as HARQ-ACK feedback (9-11). In addition, the terminals 9-03, 9-05, 9-07, and 9-09 may be terminals having an LTE-based sidelink or an NR-based sidelink function. If the terminal having only the LTE-based sidelink function will not be able to transmit and receive the NR-based sidelink signal and the physical channel. In an embodiment of the present invention, the sidelink may be used in combination with PC5 or V2X or D2D (device to device). Although groupcasting has been described above, this may also be applied to unicast signal transmission and reception between a terminal and the terminal.

In this embodiment, the terminal may exist in various forms such as a vehicle or a pedestrian.

FIG. 10 is a view illustrating mapping signals in frequency and time domains of synchronization signals and a physical broadcast channel (PBCH) of a 3GPP NR system according to an embodiment of the present invention. Primary synchronization signal (PSS) 10-01, secondary synchronization signal (SSS) 10-03, and PBCH are mapped over 4 OFDM symbols, and PSS and SSS are mapped to 12 RBs. And the PBCH is mapped to 20 RBs. 10 shows how the frequency band of 20 RBs varies depending on subcarrier spacing (SCS). The resource region through which the PSS, SSS, and PBCH are transmitted may be referred to as an SS / PBCH block.

11 is a diagram illustrating which symbols are mapped to one SS / PBCH block in a slot. An example of a conventional LTE system using a subcarrier spacing of 15 kHz and an NR system using a subcarrier spacing of 30 kHz is shown, and cell-specific reference signals (CRSs) that are always transmitted in an LTE system can be avoided. SS / PBCH blocks 11-11, 11-13, 11-15, 11-17 of the NR system are designed to be transmitted at the positions 11-01, 11-03, 11-05, 11-07 . This may be for the LTE system and the NR system to coexist in one frequency band.

FIG. 12 is a diagram illustrating which symbols can be transmitted in an SS / PBCH block in symbols within 1 ms according to a subcarrier interval, and FIG. 13 shows an SS / PBCH block in which slot and in which symbols within 5 ms. It is a figure which shows whether it can transmit according to the subcarrier spacing. In the region where the SS / PBCH block can be transmitted, the SS / PBCH block does not always need to be transmitted, and may or may not be transmitted according to the selection of the base station.

According to various embodiments of the present disclosure, the first signal may be an uplink scheduling grant signal and a downlink data signal. Also, in various embodiments of the present disclosure, the second signal may be an uplink data signal for uplink scheduling grant and a HARQ ACK / NACK for a downlink data signal. That is, according to various embodiments of the present disclosure, if a signal expects a response from the terminal among the signals transmitted from the base station, the terminal may be the first signal, and the response signal of the terminal corresponding to the first signal may be the second signal.

In addition, according to various embodiments of the present disclosure, the service type of the first signal may belong to categories of enhanced mobile broadband (eMBB), massive Mmachine Ttype Ccommunications (mMTC), and ultra-reliable and low-latency communications (URLLC). . However, this is exemplary and the service type of the first signal is not limited to the above-described category in various embodiments of the present disclosure.

[First Embodiment]

The first embodiment describes a method and apparatus for transmitting a signal in a sidelink when a terminal supports both the LTE sidelink function and the NR sidelink function, and when both functions are activated and used with reference to FIG. 14A. do.

In an embodiment of the present invention, the NR control channel or control signal in the sidelink is mixed with the NR physical sidelink control channel (NR-PSCCH), and the NR data channel or data signal or shared channel is used as the NR physical sidelink. mixed channel). In addition, the LTE control channel or control signal in the sidelink mixed with LTE physical sidelink control channel (LTE-PSCCH), LTE data channel or data signal or shared channel mixed with LTE physical sidelink shared channel (LTE-PSSCH) do. In an embodiment of the present invention, the first communication may mean LTE communication, and the second communication may mean NR communication.

One terminal may operate LTE V2X and NR V2X in different frequency bands or in the same frequency band, respectively. To this end, the terminal is a terminal operating in connection with the LTE base station, or a terminal operating in connection with the NR base station, or a terminal that wants to transmit and receive signals related to LTE V2X or NR V2X in the sidelink without being connected to any base station Can be.

FIG. 14A is a flowchart illustrating a method of determining which sidelink signal to be transmitted by a UE having both an LTE-based sidelink signal transmission and reception function and an NR-based sidelink signal transmission and reception function.

According to an embodiment of the present invention, even if both the LTE-based sidelink signal transmission and reception function and the NR-based sidelink signal transmission and reception function, if any one of the functions depending on the activation (activation) is activated without the need for priority setting Signal transmission and reception of the function may be performed (14a-07). For example, if a terminal having both an LTE-based sidelink signal transceiving function and an NR-based sidelink signal transceiving function deactivates the NR-based sidelink signal transceiving function according to a base station configuration or a predetermined region, the terminal Is to perform the LTE-based sidelink signal transmission and reception.

In operations 14a-03, the UE may determine whether it is activated to simultaneously transmit or receive LTE and NR-based sidelink signals. In the case where the LTE and NR based sidelink signals are activated to simultaneously transmit or receive, a specific time point corresponds to a resource pool for LTE based sidelink operation and also corresponds to a resource pool for NR based sidelink operation. There is work. In the present invention, transmitting simultaneously may mean transmitting in the same OFDM symbol or transmitting in the same slot. Simultaneous transmission in the terminal means that data to be transmitted internally is generated, and it is determined that some data is transmitted to the LTE-based sidelink at a specific time point, and other data is transmitted to the NR-based sidelink at the same specific time point. It may be the case that it is determined to. Although the LTE-based sidelink and the NR-based sidelink may be simultaneously transmitted according to the above determination, the actual transmission may be performed by only one of the LTE-based sidelink and the NR-based sidelink. In addition, the simultaneous transmission may be determined to transmit data to the LTE-based sidelink at the specific time while transmitting feedback at a specific time in the NR-based sidelink. However, the present invention is not limited thereto, and it may be interpreted that the transmission operation is performed at the same time in absolute time in consideration of overlapping symbols. In the present invention, receiving at the same time may mean receiving in the same OFDM symbol or receiving in the same slot. However, the present invention is not limited thereto, and it may be interpreted that the reception operation is performed at the same time in absolute time in consideration of overlapping symbols.

On the other hand, although the drawings refer to the simultaneous transmission or reception of LTE and NR-based sidelink signal, the embodiment of the present invention is not limited thereto. The same can be applied to the transmission of the LTE signal (LTE sidelink signal, LTE sidelink synchronization signal, LTE discovery signal) and NR signal (NR sidelink signal, NR sidelink synchronization signal, NR discovery signal). The determination or activation and deactivation in operations 14a-03 of FIG. 14A may be performed by L1 signaling such as higher signaling from a base station, medium access control (MAC) control element (MAC), or DCI delivered to a physical channel, or According to the region setting may be to follow the preset in a specific region. For example, when the terminal is connected to the base station, the activation and deactivation may be determined based on the information received from the base station. If the terminal is not connected to the base station or the terminal is out of coverage of the base station, a preset setting is applied. can do. In addition, based on the activation and deactivation information received in the connection state with the base station, when the connection with the base station is disconnected, or the coverage of the base station may determine whether to activate or deactivate simultaneous simultaneous LTE sidelink and NR sidelink transmission. If both the LTE-based sidelink signal transmission and reception function and the NR-based sidelink signal transmission and reception function are activated or configured, the sidelink signal may be transmitted or received according to a priority determination method (14a-05). If the LTE-based sidelink signal transceiving function and the NR-based sidelink signal transceiving function are deactivated or configured terminal, it is possible to perform operations 14a-07.

For example, the priority determination method may always prioritize the LTE sidelink function to drop transmission or reception of the NR sidelink signal, or delay or postpone the transmission or reception of the NR sidelink signal. Can be. This may be because the LTE sidelink signal carries packets with more urgent content than the NR sidelink signal. If the UE needs to transmit LTE-PSCCH or LTE-PSSCH and NR-PSCCH or NR-PSSCH at the same time, the UE can transmit only LTE-PSCCH or LTE-PSSCH without transmitting NR-PSCCH or NR-PSSCH. . Although LTE sidelink operation and NR sidelink operation are both configured and activated for a specific terminal, it is not mandatory to simultaneously transmit the LTE sidelink signal and the NR sidelink signal. When it is done, it may be to be processed according to the priority. Or in this case, a power allocation method for transmitting the LTE-PSCCH or LTE-PSSCH under the maximum power that can be used for transmission and allocating the remaining transmission power to the NR-PSCCH or NR-PSSCH may be applied.

As another example, it may be determined using the priority of the data packet to be transmitted. The transport block to be prioritized can be transmitted by comparing the priority of the transport block to be sent to the LTE-PSSCH and the transport block to be sent to the NR-PSSCH. The priority may be a value determined as a priority delivered from a higher level, and may be determined based on a value such as ProSe Per-Packet Priority (PPPP) or ProSe Per-Packet Reliability (PPPR). For example, if the priority of a transport block to be sent to the LTE-PSSCH is N_LTE, and the priority of a transport block to be sent to the NR-PSSCH is N_NR, the N_LTE and the N_NR are compared to compare the N-LTE and the NR-PSSCH. You may decide to send. The terminal may give priority to a transport block having a smaller N value. In this case, N_LTE and N_NR may be equally compared in magnitude, or a constant offset may be added to N_NR to compare magnitudes of values. For example, when using an offset value, it may be comparing N_LTE and N_NR + offset. The offset may be determined according to a base station setting, but may be a fixed fixed value or a value applied after being changed according to an NR-based sidelink setting or region. When the offset may be determined according to the base station setting, the value to be set when the offset is set from the base station may be used as an offset, and when not set, the predetermined value may be used. This offset setting may be to secure a certain priority to the LTE signal. The offset value may be received through higher signaling, a medium access control (MAC) control element (CE), or a DCI delivered to a physical channel. The UE may transmit a transport block having a higher priority first according to the priority, and transmits a transport block having a higher priority first under the maximum power that the UE can use for transmission, and allocates the remaining transmission power to the subsequent transport block. Assignment method can be applied.

It is also possible to use a combination of the above embodiments. The UE can basically confirm that the priority of the LTE sidelink is higher than the priority of the NR sidelink signal, and when the N_NR and N_LTE of the transport block can be compared, the priority of each transport block is used or an offset value is provided. In this case, the priority may be determined by comparing the N_NR + offset value and the N_LTE value.

The above example describes an example in which one terminal simultaneously transmits an LTE sidelink and an NR sidelink signal. As another example, the synchronization signal (eg, primary sidelink synchronization signal (PSSS) and secondary sidelink synchronization signal (SSSS) or discovery signal) of the LTE sidelink may be synchronized with the synchronization signal and broadcast signal or discovery signal of the NR sidelink. If it is to be transmitted at the same time, the terminal may preferentially process the signal (synchronization signal or discovery signal) of the LTE sidelink. For example, the terminal may transmit only the LTE sidelink signal (synchronization signal or discovery signal), and do not transmit or delay the NR sidelink signal. Alternatively, if the terminal allows power, the terminal allocates power for transmitting an LTE sidelink signal (synchronization signal or discovery signal), and the remaining power may be used for NR sidelink signal transmission.

As another example, if a terminal supports communication on an LTE Uu link (a link between a base station or base station type repeater to a terminal), and also supports LTE and NR sidelinks and simultaneously transmits, the LTE side for uplink transmission Priority_threshold_LTE value, which is a reference value for determining whether to transmit by comparing with Priority value of data to be transmitted in the link, and Priority_threshold_NR value, which is a reference value for determining whether to be transmitted by comparing with Priority value of data to be transmitted in NR sidelink, is set to the UE. The Priority_threshold_LTE value and the Priority_threshold_NR value may be different from each other. For example, when the UE intends to simultaneously transmit uplink to the sidelink and the LTE base station, when the priority of the data to be transmitted on the LTE sidelink is high (or low) compared to Priority_threshold_LTE, the UE performs LTE sidelink transmission. In the opposite case, LTE uplink transmission may be performed. Alternatively, when the priority of the data to be transmitted in the LTE sidelink is higher (or lower) compared to Priority_threshold_LTE, the terminal may allocate power for LTE sidelink transmission first, and allocate the remaining available power to the LTE uplink transmission. . For example, when the UE intends to simultaneously transmit uplink to the sidelink and the LTE base station, if the priority of the data to be transmitted on the NR sidelink is high (or low) compared to Priority_threshold_LTE, the UE may perform NR sidelink transmission. In the opposite case, LTE uplink transmission may be performed. Alternatively, when the priority of data to be transmitted in the NR sidelink is higher (or lower) compared to Priority_threshold_LTE, the UE may first allocate power for NR sidelink transmission and allocate remaining power to LTE uplink transmission. .

In another example, if a terminal supports communication on an NR Uu link (a link between a base station or base station type repeater to a terminal), and also supports LTE and NR sidelinks and simultaneously transmits, the LTE side for uplink transmission Priority_threshold_LTE value, which is a reference value for determining whether to transmit by comparing with Priority value of data to be transmitted in the link, and Priority_threshold_NR value, which is a reference value for determining whether to be transmitted by comparing with Priority value of data to be transmitted in NR sidelink, is set to the UE. The Priority_threshold_LTE value and the Priority_threshold_NR value may be different from each other. For example, when the UE intends to simultaneously transmit uplink to the sidelink and the NR base station, if the priority of data to be transmitted in the LTE sidelink is high (or low) compared to Priority_threshold_LTE, the UE may perform LTE sidelink transmission. In the opposite case, NR uplink transmission may be performed. Or, if the priority of the data to be transmitted in the LTE sidelink is higher (or lower) compared to Priority_threshold_LTE, the terminal may allocate power for LTE sidelink transmission first, and allocate the remaining possible power to NR uplink transmission. . For example, when the UE intends to transmit uplink to the sidelink and the NR base station at the same time, if the priority of the data to be transmitted on the NR sidelink is high (or low) compared to Priority_threshold_LTE, the UE may perform NR sidelink transmission. In the opposite case, NR uplink transmission may be performed. Alternatively, when the priority of data to be transmitted in the NR sidelink is higher (or lower) compared to Priority_threshold_LTE, the UE may first allocate power for NR sidelink transmission and allocate remaining power to NR uplink transmission. .

[Example 1-1]

Embodiment 1-1 provides a method and apparatus for determining sidelink transmission of LTE and NR in consideration of a processing time or processing capability of a terminal in performing the first embodiment.

In a situation where the terminal determines transmission on the sidelink of LTE or NR and is preparing for actual transmission, a predetermined time may be required to cancel the prepared transmission. This may be a signal processing time of the terminal. Therefore, since it takes time to cancel the transmission that has been prepared as described above, canceling the sidelink transmission of LTE according to the sidelink transmission of the NR needs to consider the time required for the transmission cancellation. Also, on the contrary, canceling the sidelink transmission of the NR according to the sidelink transmission of the LTE needs to consider the time required for the transmission cancellation.

For example, when it is determined and prepared to perform the sidelink transmission of LTE in slot n, the sidelink transmission of NR may also be determined in slot n-1 to perform in slot n. Accordingly, if it is necessary to cancel the LTE sidelink transmission in slot n, the terminal must perform cancellation of the LTE sidelink transmission within one slot. That is, LTE sidelink transmission cancellation should be determined at a time corresponding to one slot between slot n-1 in which sidelink transmission of NR is determined and slot n in which sidelink transmission of LTE is scheduled. In the above, one slot may be insufficient time to cancel transmission. Accordingly, when data to be transmitted on the NR sidelink is generated in the slot n-1, the terminal may not transmit data to be transmitted on the NR sidelink in the slot n. Because if you decide to transmit data in slot n that should be transmitted on the NR sidelink, then you also decide to transmit the LTE sidelink signal or physical channel that you have decided to transmit in slot n to the QoS value (or Priority) of the LTE and NR sidelink transmission. Accordingly, it may be necessary to cancel the transmission, but if there is not enough time for canceling the transmission of the LTE sidelink signal, it may not be able to correctly cancel the LTE sidelink transmission.

Therefore, according to an embodiment of the present invention, if the LTE sidelink transmission is already determined in the slot n before the NR sidelink transmission is determined, the UE performs the NR sidelink transmission in the slot n only before a specific time point Tp of the slot n. You can decide if you want to. In addition, when the LTE sidelink transmission is already determined in slot n, and the start time of slot n is Tn, it is not possible to determine whether to transmit the NR sidelink in slot n between Tn-Tp and Tn, Could not decide to perform the transfer.

For example, in the above-described method, it may be determined whether the NR sidelink and the LTE sidelink are simultaneously transmitted in slot n in operations 14a-03.

Meanwhile, the specific time point Tp may be determined according to the processing time or the processing capability of the terminal. For example, the processing time or processing capability required for canceling the LTE sidelink transmission that the terminal was preparing may be considered. For example, when the time required for canceling the LTE sidelink transmission prepared by the terminal is a time corresponding to three slots, the specific time point Tp may be at least an n-3 slot or a slot before the n-3 slot. . Information about the specific time point Tp may be indicated by an offset value. For example, if 3 is set as an offset value, it may indicate a slot before slot 3 from slot n.

The information on the specific time point may be determined based on UE capability information reported by the UE. The terminal capability information may include information about time required to cancel the prepared transmission. The base station may set the information on the specific time point based on the terminal capability information reported by the terminal. The information about the specific time point may be preset in the terminal or the base station. In addition, the terminal and the base station may basically use a preset default value, and when the terminal or the base station reports information on processing capability, the terminal and the base station may set information on a new processing time in consideration of the corresponding information.

Meanwhile, the operation of reporting the terminal capability information by the terminal and receiving a setting for a specific time point from the base station may be performed before the operation 14a-03, but is not limited thereto.

[Example 1-2]

Embodiment 1-2 provides a method and apparatus for determining sidelink transmission of LTE and NR when performing a feedback signal or a feedback channel in the NR sidelink in performing the first embodiment.

In the NR system, a channel for feedback transmission in signal transmission and reception on a sidelink may be defined as a physical sidelink feedback channel (PSFCH). FIG. 14B illustrates an example in which a physical sidelink feedback channel (PSFCH) 14b-05 (PSFCH), which is a physical channel for transmitting feedback information, is positioned at the end of the slot 14b-01. A certain amount of free time is secured between the PSSCH 14b-04 and the PSFCH 14b-05 so that a terminal having transmitted and received the PSSCH 14b-04 can prepare to transmit or receive the PSFCH 14b-05. You can do that. After the transmission and reception of the PSFCH 14b-05, an empty section may be secured for a predetermined time. 14C is a diagram illustrating an example in which resources for transmitting / receiving every slot PSFCH are set.

For example, when a period of a resource capable of transmitting / receiving a PSFCH can be set by a parameter such as periodicity_PSFCH_resource, the case of FIG. 16B may be a case where periodicity_PSFCH_resource = 1 slot. Alternatively, the period may be set in units of msec (milliseconds), and resources for transmitting the PSFCH may be set every slot according to a subcarrier spacing (SCS). In FIG. 14C, feedback information on the PSSCH scheduled in the n slot may be transmitted in the PSFCH of the n + 1 slot.

14D is a diagram illustrating an example in which resources are configured to transmit / receive PSFCHs every four slots. This is an example in which the PSFCH 14d-11 can be transmitted and received only in the last slot 14d-04 among the four slots 14d-01, 14d-02, 14d-03, and 14d-04. Similarly, the PSFCH 14d-13 can be transmitted and received only in the last slot 14d-08 of the four slots 14d-05, 14d-06, 14d-07, and 14d-08. The index of the slot may be a slot determined in the resource pool. That is, the four slots 14d-01, 14d-02, 14d-03, and 14d-04 are not real physically contiguous slots, but slots belonging to the resource pool (or slot pool) that the transceiver is using. It may be a slot that appears in succession. The arrow of FIG. 14D (the arrow indicating the PSSCH of PSFCH) may indicate a slot of the PSFCH through which HARQ-ACK feedback information of the PSSCH is transmitted. For example, the HARQ-ACK information of the PSSCH transmitted (or scheduled) in the slots 14d-01, 14d-02, and 14d-03 is included in the PSFCH 14d-11, which may be transmitted in the slot 14d-04, to be transmitted and received. Could be. Similarly, the HARQ-ACK information of the PSSCH transmitted (or scheduled) in slots 14d-04, 14d-05, 14d-06, 14d-07 may be transmitted in slot 14d-08. It may be included in and transmitted and received. HARQ-ACK feedback information of the PSSCH transmitted in the slot 14d-04 is not transmitted in the same slot 14d-04 terminal finishes decoding the PSSCH transmitted in the slot 14d-04 and transmits the PSFCH in the same slot 14d-04 This may be due to lack of time. That is, it may be because the minimum processing time required for processing the PSSCH and preparing the PSFCH is not small enough.

When the UE transmits and receives the PSFCH, the UE should know the number of HARQ-ACK feedback bits included in the PSFCH to correctly transmit and receive. Determining the number of HARQ-ACK feedback bits included in the PSFCH and which PSSCH HARQ bits to include may be determined based on at least one or more of the following parameters, or a combination of at least one or more parameters.

-period of a slot in which PSFCH can be transmitted / received by a parameter such as periodicity_PSFCH_resource

-Whether to bundle HARQ-ACK. The HARQ-ACK bits of the PSFCH transmitted in a predetermined number of slots before and after PSFCH transmission and reception may be determined by an AND operation. (That is, if any one is NACK, it is determined as NACK)

Number of transport blocks (TBs) included in the PSSCH

-Whether to use and set retransmission of code block group (CBG) unit

-Whether to enable HARQ-ACK feedback

-Number of PSSCHs actually transmitted and received

Minimum Processing Time (K) of UE for PSSCH Processing and PSFCH Transmission Preparation

When a terminal receiving a PSSCH receives or receives a PSSCH in slot n, when a resource capable of transmitting a PSFCH is set or given in slot n + x, by using the smallest x among integers greater than or equal to K, The HARQ-ACK feedback information of the PSSCH is mapped to the PSFCH of the slot n + x and transmitted. In the above, K may be a value set in advance from a transmitting terminal or a value set in a resource pool in which a corresponding PSSCH or PSFCH is transmitted, and each terminal may exchange its capability with the transmitting terminal in advance for the setting. The receiving terminal should be included in the PSFCH when transmitting the PSFCH in a specific slot in consideration of the slot included in the resource pool, the slot in which the PSFCH resource is set, the period N in which the PSFCH resource is set, and K set or determined according to the processing time of the terminal. The number of HARQ-ACK feedback bits may be determined.

When the UE decides to transmit the PSFCH in the PSCCH or PSSCH and the NR sidelink in the same slot or at the same time in the LTE sidelink, a method for finally determining which signal or which physical channel the terminal transmits is as follows. Can be provided together. For example, when determining the priority in operation 14-05, the priority may be applied using the following method.

Method 1: Transmit PSCCH or PSSCH on LTE Sidelink and Do Not Transmit PSFCH on NR Sidelink This method may be because even if the PSFCH is not transmitted in the NR sidering, the problem that the NR sidelink data transmission becomes impossible may not occur.

Method 2: Transmit PSFCH on NR sidelink without transmitting PSCCH or PSSCH on LTE sidelink. In this method, when the NR sidelink needs to be transmitted, the PSFCH is not transmitted in the corresponding slot unless the PSFCH is transmitted in the corresponding slot, and in the LTE sidelink, the PSCCH / PSSCH is the next slot, slot n + 1. This may be because the data can be transmitted after slot n.

Method 3: The QoS value (or Priority value) of the PSSCH to be transmitted in the LTE sidelink is called the first QoS value, and the QoS value of the PSSCH of the NR sidelink corresponding to HARQ-ACK included in the PSFCH to be transmitted in the NR sidelink ( Or Priority value) is assumed to be a second QoS value. By comparing the first QoS value and the second QoS value, if the priority of the first QoS value is high, the LTE sidelink transmits a PSCCH or a PSSCH. By comparing the first QoS value and the second QoS value, if the priority of the second QoS value is high, the PSFCH is transmitted on the NR sidelink. The high priority of the QoS value may be a low priority value. Higher priority may mean that priority should be transmitted first.

Method 4: Assume the QoS value (or Priority value) of the PSSCH of the NR sidelink corresponding to the HARQ-ACK included in the PSFCH to be transmitted in the NR sidelink as the second QoS value. Comparing the second QoS value with a preset QoS reference value, if the priority of the second QoS value is higher than the QoS reference value, the PSFCH is transmitted in the NR sidelink. If the QoS reference value is higher than the priority of the second QoS value, the NR sidelink does not transmit the PSFCH, but transmits the PSCCH or PSSCH of the LTE sidelink. The high priority of the QoS value may be a low priority value. Higher priority may mean that priority should be transmitted first. In the above, the QoS reference value may be set according to the resource pool, that is, each resource pool may have a different QoS reference value, and may be a value set according to subcarrier spacing.

Method 5: Assume the QoS value (or Priority value) of the PSSCH to be transmitted in the LTE sidelink as the first QoS value. Comparing the first QoS value with a preset QoS reference value, if the priority of the first QoS value is higher than the QoS reference value, the PSCCH or PSSCH is transmitted in the LTE sidelink. If the QoS reference value is higher than the priority of the first QoS value, the LTE sidelink transmits the PSFCH of the NR sidelink without transmitting the PSCCH or the PSSCH. The high priority of the QoS value may be a low priority value. Higher priority may mean that priority should be transmitted first. In the above, the QoS reference value may be set according to a resource pool, that is, each resource pool may have a different QoS reference value, and may be a value set according to a subcarrier interval.

[Example 1-3]

Embodiment 1-3 provides a method and apparatus for determining sidelink transmission of LTE and NR when only channel status report information is transmitted in the NR, not data.

In the sidelink, the transmitting terminal may transmit a channel state information reference signal (CSI-RS) for the sidelink, and the receiving terminal receives the CSI-RS for the sidelink and based on this, measures a channel from the transmitting terminal of the sidelink. Can be. The sidelink CSI-RS may be transmitted in the same frequency band as the PSSCH. After measuring the sidelink channel, the receiving terminal may transmit information (CSI feedback information) about an appropriate modulation order, code rate, rank, precoding information (PMI), and the like, to the transmitting terminal. The CSI feedback information may be transmitted by the receiving terminal to the transmitting terminal using PSSCH or PSFCH. Even when transmitting on the PSSCH, it can be directly mapped to a physical resource, but it is also possible to map and transmit the feedback information to the MAC CE.

The terminal transmitting the PSCCH and the PSSCH in the sidelink may include at least one of the following information in the SCI and transmit the same to the receiving terminal.

-Whether to transmit the CSI-RS: to allow the receiving terminal to grasp the channel state information by receiving the CSI-RS.

Whether to report CSI feedback information: When the CSI information is mapped and transmitted to the PSSCH resource, the receiving terminal needs to know whether the CSI feedback information is mapped to the PSSCH resource to successfully decode the PSSCH except for the CSI information.

Whether the SL-SCH (sidelink shared channel) is included in the PSSCH (indicates whether the SL-SCH is included): indicates whether the SL-SCH is included in the PSSCH or only CSI is mapped separately.

Each bit may be included in the SCI separately to convey the information. For example, the SL-SCH indicator may be defined as one bit as follows. (A value of "1" indicates SL-SCH shall be transmitted on the PSSCH and a value of "0" indicates SL-SCH shall not be transmitted on the PSSCH.)

If CSI is transmitted through MAC CE or PC5-RRC, the SL-SCH inclusion indicator may not be included in the SCI.

Alternatively, a method of indicating two or more pieces of information together with more than one bit may be used. For example, whether or not each bit includes CSI-RS transmission, whether CSI feedback information is reported, and whether the SL-SCH is included in the PSSCH using 2-bit or 3-bit bitmap information. Can be indicated.

The inclusion of the SL-SCH may be information indicating whether the PSSCH includes only sidelink CSI feedback information or other data. When only the CSI feedback information is included in the PSSCH and transmitted, the transmitting terminal may not need to transmit information to the receiving terminal that there is retransmission of the PSSCH after the corresponding PSSCH transmission or initial transmission before the corresponding PSSCH transmission. This may be because the PSSCH does not include data other than CSI feedback. Therefore, the SCI for scheduling the PSSCH including only the sidelink CSI feedback may be fixed to at least one or more of the following bitfields to a specific value, and thus may inform the receiving terminal that the PSSCH includes only the CSI feedback. .

Resource reservation: A bitfield that conveys information occupying a particular frequency-time domain resource in the future.

Frequency resource location of initial transmission and retransmission: Bitfield indicating the frequency domain location of the PSSCH corresponding to the initial transmission or retransmission of the scheduled PSSCH

Time gap between initial transmission and retransmission: Bitfield indicating the time domain location of the PSSCH corresponding to the initial transmission or retransmission of the scheduled PSSCH, that is, the transmission time difference

For example, when a transmission terminal is scheduled for a PSSCH including only sidelink CSI feedback, the transmission terminal may transmit by setting the time gap between initial transmission and retransmission of the scheduling SCI to 0000 (all zero). If the receiving terminal decodes the SCI, and the time gap between initial transmission and retransmission bitfield value is 0000, it can be understood that the PSSCH scheduled by the corresponding SCI includes only CSI feedback without the SL-SCH. As another example, the PSSCH scheduled by the corresponding SCI may be indicated or interpreted as including only CSI feedback without the SL-SCH by setting the value of the resource reservation or frequency resource location of initial transmission and retransmission field to a specific value.

If the PSSCH to be transmitted in the NR sidelink includes only CSI information without other data, the UE may transmit the PSCCH or the PSSCH of the LTE and may not transmit the PSSCH in the NR sidelink including the CSI feedback. In this method, the CSI may be because the UE that receives the CSI may not significantly affect the operation of the sidelink system even if the UE does not receive the CSI. For example, when determining the priority in operation 14a-05, if the PSSCH to be transmitted in the NR sidelink includes only CSI information without other data, the UE has priority over the NR sidelink including the PSICH or the PSSCH of the LTE. It can be judged that the ranking is high.

Second Embodiment

In the second embodiment, the minimum processing for delivering HARQ-ACK feedback on the NR-PSSCH when one terminal supports both the LTE sidelink function and the NR sidelink function, and when both of the functions are activated and used. The present invention provides a method and apparatus for calculating the minimum processing time by reflecting whether an LTE sidelink signal or an NR downlink signal to a base station is received simultaneously with the NR-PSSCH or in the same slot.

When the base station transmits an uplink scheduling grant or downlink control signal and data to the terminal in slot n, the terminal may receive an uplink scheduling grant or downlink control signal and data in slot n. At this time, the terminal may receive later than the transmission delay time by the base station. In the present embodiment, when the first signal is received in slot n, the terminal may transmit the corresponding second signal in slot n + k. For example, k may be 4, but is not limited thereto. Even when the terminal transmits a signal to the base station, in order to arrive at the base station at a specific time, HARQ ACK / uplink or downlink data for the uplink data or the downlink data at a timing earlier than the slot n + 4 of the signal reference received by the terminal NACK may be transmitted. Therefore, in this embodiment, the time that the UE can receive uplink scheduling approval and transmit uplink data or receive downlink data and prepare for transmitting HARQ ACK or NACK is TA at a time corresponding to three slots. It may be time except.

In order to determine the above-described timing, the base station may calculate the absolute value of the TA of the corresponding terminal. When the terminal initially accesses, the base station may calculate the absolute value of the TA by adding or subtracting the amount of change in the TA value transmitted through higher signaling to the TA value first delivered to the terminal in a random access step. have. In an embodiment of the present invention, the absolute value of TA may be a value obtained by subtracting the start time of the nth TTI received by the UE from the start time of the nth TTI transmitted by the UE.

이후에 Cyclic Prefix(CP)가 시작하는 첫 번째 심볼일 수 있다.

는 아래의 [수학식 1]과 같이 계산될 수 있다.In a 5G or NR system, when a base station transmits a PDSCH including downlink data, a DCI scheduling PDSCH indicates a K1 value corresponding to timing information for transmitting HARQ-ACK information of the PDSCH. If the HARQ-ACK information is not instructed to be transmitted before the symbol L1 including timing advance, the terminal may transmit the information to the base station. That is, HARQ-ACK information may be transmitted from the terminal to the base station at a time equal to or later than the symbol L1 including timing advance. If the HARQ-ACK information is indicated to be sent before the symbol L1 including timing advance, the HARQ-ACK information may not be valid HARQ-ACK information in the HARQ-ACK transmission from the terminal to the base station. Symbol L1 is from the last time of PDSCH

This may be the first symbol that Cyclic Prefix (CP) starts after.

May be calculated as shown in Equation 1 below.

[Equation 1]

, μ, TC는 아래와 같이 정의될 수 있다.In Equation 1 described above, N ₁ , d _1,1 , d _1,2 ,

, μ, TC may be defined as follows.

When HARQ-ACK information is transmitted on the PUCCH (uplink control channel), d _1,1 = 0, and on the PUSCH (uplink shared channel, data channel), d _1,1 = 1.

When the terminal receives a plurality of activated configuration carriers or carriers, the maximum timing difference between carriers may be reflected in the second signal transmission.

In the case of PDSCH mapping type A, that is, when the first DMRS symbol position is the third or fourth symbol of the slot, if the position index i of the last symbol of the PDSCH is less than 7, it is defined as d _1,2 = 7-i. do.

For PDSCH mapping type B, i.e., where the first DMRS symbol location is the first symbol of the PDSCH, d _1,2 = 3 if the length of the PDSCH is 4 symbols, and d _1,2 if the length of the PDSCH is 2 symbols. = 3 + d, d is the number of symbols overlapping the PDSCH and the PDCCH including the control signal for scheduling the PDSCH.

N ₁ is defined according to μ as shown in Table 2 below. μ = 0, 1, 2, and 3 denote subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, and 120 kHz, respectively.

TABLE 2

The N ₁ value provided in the above-mentioned [Table 2] may be different depending on UE capability.

로 각각 정의된다.-

Are each defined as

를 아래의 [수학식 2]와 같이 계산할 수 있다.In case of receiving the LTE / NR downlink signal from the LTE sidelink or the base station simultaneously with the NR-PSSCH, the UE may process the LTE / NR downlink signal from the LTE sidelink or the base station before the NR-PSSCH. . In this case, the UE may transmit HARQ-ACK feedback for the NR-PSSCH or increase the time required for transmitting the CSI feedback. Therefore, in this case, the UE has a minimum processing time for transmitting HARQ-ACK feedback on the NR-PSSCH.

Can be calculated as shown in Equation 2 below.

[Equation 2]

, μ, TC는 상기의 수학식 1에서와 같이 정의될 수 있으며, d_1,3는 하기와 같이 정의될 수 있다.In Equation 2 described above, N ₁ , d _1,1 , d _1,2 ,

, μ, TC may be defined as in Equation 1 above, and d _1,3 may be defined as follows.

이고, 이외의 경우에는

.If the LTE sidelink signal, or the LTE downlink signal from the base station, or the NR downlink signal and the NR-PSSCH from the base station are received in the same slot or in the same OFDM symbol

, Otherwise

.

로 하여 최소 프로세싱시간 계산에 고려할 수 있다. 한편, 단말이 NR 사이드링크 신호를 LTE 사이드링크 신호 혹은 LTE 다운링크 신호 혹은 NR 다운링크 신호와 동시에 수신한 경우 최소 프로세싱 시간을 증가시키기 위해서 적용할 오프셋 값을 기지국으로부터 수신하거나, 미리 설정된 값을 사용할 수도 있다.In the above example, the minimum processing time is increased by one symbol when one or more signals of the LTE sidelink signal, the LTE downlink signal from the base station, or the NR downlink signal from the base station are simultaneously received. . In this embodiment, the increase in the minimum processing time is not limited to one symbol. The terminal may increase n symbols with a minimum processing time. You can also increase the timing value in units of less than one symbol. In the present embodiment, the simultaneous reception may be the case in which the same OFDM symbol is received or in the same slot. As another example, the number of signals simultaneously received among three kinds of signals, such as an LTE sidelink signal, an LTE downlink signal from a base station, or an NR downlink signal from a base station

This can be considered in the calculation of the minimum processing time. Meanwhile, when the terminal receives the NR sidelink signal simultaneously with the LTE sidelink signal or the LTE downlink signal or the NR downlink signal, the terminal receives an offset value to be applied to increase the minimum processing time from the base station or uses a preset value. It may be.

When the terminal receives the NR-PSSCH, the terminal may determine whether the LTE sidelink signal or the LTE downlink signal from the base station or the NR downlink signal from the base station are simultaneously received. Unless the terminal is configured to simultaneously receive the LTE and NR based side link signals, the operation of checking whether the LTE side link signals are simultaneously received may be omitted. In contrast, the terminal may determine whether the NR sidelink signal and the LTE sidelink signal are simultaneously received when the terminal is configured to simultaneously receive the LTE and the NR based side link signal. Whether or not received at the same time may be a case where the NR sidelink signal and the LTE side link signal or the LTE downlink signal from the base station or the NR downlink signal from the base station are received in the same symbol or the same slot.

If it is determined that the received at the same time, the terminal may calculate the minimum processing time for HARQ processing of the NR sidelink signal in consideration of the processing of the LTE signal or the NR downlink signal from the base station. The terminal may obtain a minimum processing time based on the parameter mentioned in Equation 2 above. The terminal may perform an HARQ operation for the reception of the NR sidelink signal based on the obtained minimum processing time.

Third Embodiment

According to the third embodiment, when the UE supports all of the NR sidelink functions, when the UE wants to transmit two TBs in the NR-PSSCH, it is included in the sidelink control information (SCI) of the NR-PSCCH. A method of setting the priority will be described with reference to FIG. 15.

FIG. 15 is a diagram illustrating an example in which an SCI transmitted on a control channel NR-PSCCH schedules an NR-PSSCH. The SCI 15-01 may include the priority 15-03 and transmit the same to the receiving terminal. The receiving terminal may determine whether to receive or a signal processing order based on the Priority. The priority may be for data transmitted from a higher level and may be determined based on values such as ProSe Per-Packet Priority (PPPP) or ProSe Per-Packet Reliability (PPPR). When the SCI 15-01 schedules the NR-PSSCH 15-05, the NR-PSSCH 15-05 may include two TBs. TB 1 (15-07) and TB 2 (15-09) may each include one or more packets transmitted from the upper, each of the packets may have a priority value. Therefore, it is necessary to determine which of the priority values of the packets included in the two TBs to be Priotiy (15-03) included in the SCI (15-01) for scheduling the NR-PSSCH. For example, if the NR-PSCCH and the NR-PSSCH are determined to be scheduled through the DCI from the base station, the UE sets the highest value among the priority values included in the two TBs scheduled in the DCI to the priority included in the SCI. (For two TB transmission case, the UE shall set the "Priority" field according to the highest priority among those priority (s) indicated by higher layers corresponding to the transport blocks scheduled by the same DCI. The highest priority among the priority values included in each of the plurality of scheduled packets included in the TBs may be set to the priority included in the SCI. It may be determined that the smaller the priority value, the higher the priority. In addition, depending on the setting, it may be determined that the case where the priority value is large is high. As another example, if the UE determines to send the NR-PSCCH and the NR-PSSCH, the UE sets the highest value among the priority values included in the two TBs to be transmitted to the priority included in the SCI. (For two TB transmission case, the UE shall set the "Priority" field according to the highest priority among those priority (s) indicated by higher layers corresponding to the transport blocks. The highest priority among the priority values included in each of the plurality of packets included in other TBs may be set to the priority included in the SCI. It may be determined that the smaller the priority value, the higher the priority. In addition, depending on the setting, it may be determined that the case where the priority value is large is high. Alternatively, when the terminal receives the scheduling from the base station and performs the sidelink transmission, the terminal may use the priority value transmitted by the DCI scheduled in the downlink for the SCI.

In addition, when scheduling two TBs with one SCI, the terminal may include a priority value for each TB in the SCI. In addition, when the SCI includes a priority value for each TB, the SCI may be configured to include a priority value for TB1 and an offset value for the priority value of TB1 for TB2.

Fourth Embodiment

A fourth embodiment provides a method and apparatus for using Quality of Service (QoS) parameter information of data transmitted and received in a terminal performing transmission and reception on a sidelink. The QoS parameter may be information including a requirement to be satisfied by the data, and the requirement may include latency or delay, priority, and the like.

First, the terminal may receive a bandwidth part (BWP) for sidelink communication within one carrier that is transmitting and receiving for sidelink communication. The terminal may process the transmitted and received signals based on the BWP.

Next, the terminal may receive a resource pool in the set BWP. The resource pool may be a resource pool for sidelink transmission, or may be a resource pool for sidelink reception, or may be a resource pool for sidelink transmission and reception. In this case, n_PRBstartRP, which is the lowest PRB index of the resource pool, may be delivered to set the resource pool, and the lowest PRB index of the resource pool may use an offset value based on the smallest PRB in the BWP to which the resource pool belongs. Can be delivered. That is, n_PRBstartRP, which is the lowest PRB index of the resource pool, may mean the n_PRBstartRP-th PRB from the smallest PRB of the corresponding BWP. In this way, in allocating the frequency resources of the resource pool, the reference point is the lowest PRB number of the corresponding BWP.

The resource pool may be resource determined according to information of frequency and time resources, and settings regarding transmission and reception operations performed in the resource pool may also be provided to the terminal according to the resource pool. The resource pool resource and configuration information according to the resource pool may be set from the base station to the terminal, through the exchange of information between the terminals, or may be stored in advance when the terminal is made.

In 5G systems, QoS information may be delivered through a QoS parameter called 5G QoS Identifier (5GI). Resource type, priority, delay time, error rate, etc. are allocated to one 5QI value, and can be defined by the following table.

TABLE 3

For example, in Table 3, the 5QI value 82 has a data type of Delay Critical GBR, and has a priority of 19, a delay limit of 10 ms, an error rate of 10-4, and a one-time data generation amount of 255 bytes.

When configuring a resource pool in the sidelink, it may be possible to set a set of 5QI values that data that can be transmitted and received in the resource pool together. That is, for example, while setting a specific resource pool, the resource pool may be configured to transmit and receive data having a 5QI value of 1, 2, 4, 5, 6, 82, 83, 84. In this case, {1, 2, 4, 5, 6, 82, 83, 84} data having values other than eight 5QI values may be considered not to be transmitted or received in the corresponding resource pool. QoS parameters for sidelink transmission and reception may be determined and applied differently from Table 3 above, and the corresponding parameters may be referred to as PC5 5QI or PQI (PC5 5QI). In the above, PC5 refers to an inter-terminal link and may be regarded as a side link.

At this time, the terminal for transmitting the control information (SCI; sidelink control information) in the resource pool may include 5QI information in the SCI.

16 is a diagram illustrating an SCI transmission operation of a sidelink transmitting terminal according to 5QI configuration information. For example, if the resource pool is set to transmit and receive data having a 5QI value of 1, 2, 4, 5, 6, 82, 83, 84, 3 bits in the SCI are {1, 2, 4, 5 , 6, 82, 83, 84} may be used as a 5QI indicator indicating one. In operation 16-01, the sidelink transmitting terminal may receive a 5QI value setting that may have data that may be transmitted in a resource pool corresponding to the resource pool setting. In operation 16-02, the sidelink transmitting terminal may determine the size of the 5QI indication bitfield included in the SCI transmitted from the corresponding resource pool according to the configuration information. The sidelink transmitting terminal may transmit the SCI including the 5QI configuration information based on the determined size of the 5QI indication bitfield. The terminal receiving the SCI may interpret the 5QI indicator bitfield included in the SCI, and may find 5QI information of data scheduled by the SCI.

17 is a diagram illustrating an SCI reception operation of a sidelink receiving terminal according to 5QI configuration information.

In operation 17-11, the sidelink receiving terminal may receive a 5QI value setting that may be included in data that may be transmitted in the corresponding resource pool. In operation 17-12, the receiving terminal may determine the size of the 5QI indication bitfield included in the SCI received from the corresponding resource pool according to the configuration information. The sidelink receiving terminal may find 5QI information of data scheduled by the SCI by interpreting a 5QI indicator bitfield included in the SCI. In operation 17-13, the receiving terminal may know QoS information such as priority or delay time of the corresponding data from the found 5QI, and perform channel access based on at least one parameter of the QoS information. The channel access is used to determine whether the frequency-time resource of the sidelink can be used by the UE, and may be performed based on SCI decoding or measuring the strength or energy of the received signal. have. The bitfield size of the 5QI indicator included in the SCI may be determined based on the number of 5QI values set in the resource pool. That is, if the number of 5QI values of data that can be transmitted in the resource pool is N, the bitfield size for the 5QI indication included in the SCI may be ceiling (log ₂ (N)) bits. In the above, ceiling (X) may mean the smallest integer greater than or equal to X. Therefore, if there is only one 5QI value of data that can be transmitted in the corresponding resource pool, that is, N = 1, the SCI transmitted in the corresponding resource pool may not include the 5QI indication bitfield (0 bits). In the above, the information of the 5QI value is set according to the resource pool, but this may be set according to the BWP. That is, it is possible to set a set of 5QI values that data that can be transmitted and received in a specific BWP.

In order to carry out the above embodiments of the present invention, a transmitter, a receiver, and a processor of the terminal and the base station are shown in FIGS. In order to determine the priority of the LTE sidelink and NR sidelink in the first embodiment, and to perform the operation of transmitting and receiving the sidelink signal, there is shown a transmission and reception method of the base station and the terminal, the receiver of the base station and the terminal to perform this , The processor and the transmitter shall each operate according to the embodiment. In the following operation, a base station may be a terminal that performs transmission in a sidelink or may be a conventional base station. In the following operation, a terminal may be a terminal that performs transmission or reception on a sidelink.

Specifically, FIG. 18 is a diagram illustrating a configuration of a terminal according to an embodiment of the present invention. As shown in FIG. 18, the terminal of the present invention may include a terminal receiver 18-00, a terminal transmitter 18-04, and a terminal processor 18-02. The terminal receiver 18-00 and the terminal collectively refer to the transmitter 18-04 and may be called a transceiver in the embodiment of the present invention. The transceiver may transmit and receive a signal with the base station. The signal may include control information and data. To this end, the transceiver may be configured with an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low noise amplifying the received signal and down-converting the received signal. In addition, the transceiver may receive a signal through a wireless channel, output the signal to the terminal processor 18-02, and transmit a signal output from the terminal processor 18-02 through a wireless channel. The terminal processor 18-02 may control a series of processes such that the terminal may operate according to the above-described embodiment of the present invention. The terminal processor 18-02 may be called a controller. The controller may include at least one processor.

The controller is connected to the transceiver and determines simultaneous transmission of a first communication based sidelink signal and a second communication based sidelink signal, and when the simultaneous transmission is set, the first communication based sidelink signal and the first communication signal. 2 may determine a priority of the communication-based sidelink signal, and control to process the first communication-based sidelink signal and the second communication-based sidelink signal based on the priority.

The first communication based sidelink signal may include a long term evolution (LTE) based sidelink signal, and the second communication based sidelink signal may include a new radio (NR) based sidelink signal. In this case, the priority may precede the LTE-based sidelink signal with the NR-based sidelink signal.

The controller may be configured based on first priority information included in a first packet corresponding to the first communication based sidelink signal and second priority information included in a second packet corresponding to the second communication based sidelink signal. The priority may be determined. The first priority information and the second priority information may be at least one of ppp (prose per-packet priority) or pppr (prose per-packet reliability), but are not limited thereto.

The controller may determine the simultaneous transmission based on the processing time of the terminal. The processing time of the terminal may correspond to a time required for canceling transmission of the first communication-based sidelink signal. In addition, if the NR based sidelink signal is feedback information of a physical sidelink feedback channel (PSFCH), the controller may not transmit the NR based sidelink signal or give priority to a first communication based sidelink signal. have.

Further, if the second communication based sidelink signal is feedback information of NR based PSFCH, the controller may be configured to the first QoS value of the first communication based sidelink signal and the second QoS value of the second communication based sidelink signal. The priority may be determined based on the above.

In addition, if the second communication based sidelink signal is NR based channel state report information, the controller may not transmit the second communication based sidelink signal or give priority to the first communication based sidelink signal. have.

19 is a diagram illustrating a configuration of a base station according to an embodiment of the present invention. As shown in FIG. 19, the base station of the present invention may include a base station receiving unit 19-01, a base station transmitting unit 19-05, and a base station processing unit 19-03. The base station receiver 19-01 and the base station transmitter 19-05 may be collectively referred to as a transceiver. The transceiver may transmit and receive a signal with the terminal. The signal may include control information and data. To this end, the transceiver may be configured with an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low noise amplifying the received signal and down-converting the received signal. Also, the transceiver may receive a signal through a wireless channel, output the signal to the base station processor 19-03, and transmit a signal output from the terminal processor 19-03 through the wireless channel. The base station processor 19-03 may control a series of processes to operate the base station according to the embodiment of the present invention described above. The base station processor 19-03 may be referred to as a controller. The controller may include at least one processor.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples to easily explain the technical contents of the present invention and help the understanding of the present invention, and are not intended to limit the scope of the present invention. That is, it is obvious to those skilled in the art that other modifications based on the technical idea of the present invention can be implemented. In addition, each of the above embodiments can be combined with each other if necessary to operate. For example, it will be possible for the first and second embodiments to be combined and applied. In addition, the above embodiments may be implemented in other modifications based on the technical spirit of the embodiment, such as LTE system, 5G system.

Claims (15)

In the transmission method of the terminal, Determining simultaneous transmission of the first communication based sidelink signal and the second communication based sidelink signal; Determining priority of the first communication based sidelink signal and the second communication based sidelink signal when the simultaneous transmission is set; And Processing the first communication based sidelink signal and the second communication based sidelink signal based on the priority. The method of claim 1, wherein the first communication based sidelink signal comprises a long term evolution (LTE) based sidelink signal, and the second communication based sidelink signal comprises a new radio (NR) based sidelink signal. , The priority is characterized in that to prioritize the LTE-based sidelink signal to the NR-based sidelink signal. The method of claim 1, The priority based on first priority information included in a first packet corresponding to the first communication based sidelink signal and second priority information included in a second packet corresponding to the second communication based sidelink signal; Determine the first priority information and the second priority information, At least one of PPPP (prose per-packet priority) or PPPR (prose per-packet reliability), Received an offset value from the base station, and determines the priority by applying the offset value received from the base station, And if the offset value is not received from the base station, determining the priority by applying a preset offset value. The method of claim 1, wherein the simultaneous transmission is determined based on a processing time of the terminal. The method of claim 4, wherein And the processing time of the terminal corresponds to a time required for canceling transmission of the first communication based sidelink signal. The method of claim 2, wherein the NR-based sidelink signal is not transmitted when the NR-based sidelink signal is feedback information of a physical sidelink feedback channel (PSFCH). The method of claim 1, wherein if the second communication-based sidelink signal is feedback information of NR-based PSFCH, And determining the priority based on a first QoS value of the first communication based sidelink signal and a second QoS value of the second communication based sidelink signal. The method of claim 1, wherein if the second communication based sidelink signal is NR based channel state report information, the second communication based sidelink signal is not transmitted. In the terminal, A transceiver; And Connected to the transceiver, and determines simultaneous transmission of a first communication based sidelink signal and a second communication based sidelink signal, and when the simultaneous transmission is set, the first communication based sidelink signal and the second communication based And a controller configured to determine a priority of a sidelink signal and to control processing of the first communication based sidelink signal and the second communication based sidelink signal based on the priority. 10. The method of claim 9, wherein the first communication based sidelink signal comprises a long term evolution (LTE) based sidelink signal, and the second communication based sidelink signal comprises a new radio (NR) based sidelink signal. , The priority is a terminal characterized in that prioritizing the LTE-based sidelink signal to the NR-based sidelink signal. The method of claim 9, The priority based on first priority information included in a first packet corresponding to the first communication based sidelink signal and second priority information included in a second packet corresponding to the second communication based sidelink signal, Judging The first priority information and the second priority information, A terminal characterized in that at least one of PPPP (prose per-packet priority) or PPPR (prose per-packet reliability). The method of claim 9, wherein the simultaneous transmission is determined based on a processing time of the terminal. And a processing time of the terminal corresponds to a time required for canceling transmission of the first communication-based sidelink signal. The terminal of claim 10, wherein the NR-based sidelink signal does not transmit the NR-based sidelink signal if the NR-based sidelink signal is feedback information of a physical sidelink feedback channel (PSFCH). The method of claim 9, wherein the second communication based sidelink signal is feedback information of an NR based PSFCH. And determining the priority based on a first QoS value of the first communication based sidelink signal and a second QoS value of the second communication based sidelink signal. The terminal of claim 9, wherein the second communication-based sidelink signal does not transmit the second communication-based sidelink signal if the second communication-based sidelink signal is NR-based channel state report information.

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