Method and device for transmitting and receiving uplink reference signal in wireless communication system

Abstract

A method for transmitting an uplink (UL) reference signal in a wireless communication system, performed by a user terminal (UE), is provided. The method includes receiving first information indicating whether transform precoding and pi / 2 binary phase shift keying (BPSK) modulation are applied to a physical uplink shared channel (PUSCH), receiving second information indicating whether the pi / 2 BPSK modulation is applied to a UL demodulation reference signal (DMRS), and identifying a sequence having a first peak-to-average power ratio (PAPR) characteristic based on the first information and the second information.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system and more particularly to a method and apparatus for transmitting and receiving an uplink (UL) reference signal. Background Art

[0002] Due to the commercialization of the fourth generation (4G) communication system, in order to meet the growing demand for wireless data traffic, efforts have been made to develop an improved fifth generation (5G) communication system or a quasi-5G communication system. For this reason, the 5G communication system or the quasi-5G communication system is also referred to as an ultra-4G network communication system or a post-long term evolution (LTE) system. In order to achieve higher data transmission rates, it is being considered to implement a 5G communication system in an ultra-high frequency band (millimeter wave). In the 5G communication system, beamforming, massive multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming and massive antenna technology have been discussed as a way to reduce propagation path loss and increase propagation distance in the ultra-high frequency band. For the improvement of the system network, in the 5G communication system, the development of technologies such as evolved small cells, advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, cooperative communications, coordinated multi-point (CoMP) and interference elimination has been completed. In addition, for 5G systems, other technologies have been developed, such as hybrid frequency shift keying (FSK) with quadrature amplitude modulation (QAM) modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coding modulation (ACM) schemes, and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as advanced access schemes.

[0003] The Internet is a human-centered connectivity network in which humans generate and consume information, which is now evolving into the Internet of Things (IoT) in which distributed entities such as objects exchange and process information. The Internet of Everything (IoE) has also emerged, which is a combination of IoT technology and big data processing technology through connection with cloud servers, etc. In order to implement the IoT, various technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology are required, and technologies related to sensor networks for connecting objects, machine-to-machine (M2M), and machine-type communication (MTC) have recently been studied. Such an IoT environment can provide intelligent Internet technology (IT) services that create new value for human life by collecting and analyzing data generated between connected objects. Through the integration and combination between existing IT and various industries, IoT can be applied to multiple fields, including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, health care, smart appliances, and advanced medical services.

[0004] Therefore, various attempts have been made to apply 5G communication systems to IoT networks. For example, 5G communication technologies such as sensor networks, M2M, MTC, etc. have been implemented through schemes such as beamforming, MIMO, and array antennas. The application of cloud RAN as a big data processing technology can also be an example of the fusion of 5G technology and IoT technology.

[0005] As described above, with the development of mobile communication systems, various services may be provided, and thus, a way of transmitting and receiving a UL reference signal is required to smoothly provide such services.

[0006] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0007] Aspects of the present disclosure are to address at least the above problems and / or disadvantages and to provide at least the advantages described below.Accordingly, an aspect of the present disclosure is to provide a method and apparatus for transmitting and receiving an uplink (UL) reference signal in a wireless communication system.

[0008] Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments.

[0009] According to one aspect of the present disclosure, a method for transmitting a UL reference signal in a wireless communication system performed by a user terminal (UE) is provided. The method includes receiving first information indicating whether transform precoding and pi / 2 binary phase shift keying (BPSK) modulation are applied to a physical uplink shared channel (PUSCH), receiving second information indicating whether pi / 2 BPSK modulation is applied to a UL demodulation reference signal (DMRS), and identifying a sequence having a first peak-to-average power ratio (PAPR) characteristic based on the first information and the second information.

[0010] According to another aspect of the present disclosure, a method is provided, including sending a DMRS by using the identified sequence.

[0011] Receiving information indicating whether transform precoding and pi / 2 BPSK modulation are applied to the PUSCH may include receiving information indicating whether transform precoding and pi / 2 BPSK modulation are applied to the PUSCH through higher layer signaling.

[0012] Identifying a sequence having a first PAPR characteristic based on information indicating whether transform precoding and pi / 2 and BPSK modulation are applied to the PUSCH and information indicating whether pi / 2 BPSK modulation is applied to the UL DMRS may include identifying a sequence having a second PAPR when transform precoding is not applied to the PUSCH or when pi / 2 BPSK modulation is not applied to the PUSCH.

[0013] The UL DMRS may include a PUSCH DMRS and a physical uplink control channel (PUCCH) DMRS.

[0014] According to an aspect of the present disclosure, a UE for transmitting a UL reference signal in a wireless communication system is provided. The UE includes a transceiver and at least one processor, the processor is connected to the transceiver and configured to receive information indicating whether transform precoding and pi / 2 BPSK modulation are applied to a PUSCH, receive information indicating whether pi / 2 BPSK modulation is applied to a UL DMRS, and identify a sequence having a first PAPR characteristic based on the information indicating whether transform precoding and pi / 2 and BPSK modulation are applied to the PUSCH and the information indicating whether pi / 2 BPSK modulation is applied to the UL DMRS.

[0015] The at least one processor may also be configured to transmit the DMRS by using the identified sequence.

[0016] The at least one processor may also be configured to receive, through higher layer signaling, information indicating whether transform precoding and pi / 2 BPSK modulation are applied to the PUSCH.

[0017] The at least one processor may be further configured to identify using the sequence having the second PAPR when transform precoding is not applied to the PUSCH or when pi / 2 BPSK modulation is not applied to the PUSCH.

[0018] UL DMRS may include PUSCH DMRS and PUCCH DMRS.

[0019] According to aspects of the present disclosure, a method for transmitting and receiving a UL reference signal in a wireless communication system performed by a base station is provided. The method includes: sending information indicating whether transform precoding and pi / 2 BPSK modulation are applied to a PUSCH to a UE; sending information indicating whether pi / 2 BPSK modulation is applied to a UL DMRS to the UE; and receiving from the UE a DMRS identified based on the information indicating whether transform precoding and pi / 2 and BPSK modulation are applied to the PUSCH and the information indicating whether pi / 2 BPSK modulation is applied to the UL DMRS.

[0020] The DMRS may be identified by using a sequence having a first PAPR characteristic generated based on information indicating whether transform precoding and pi / 2 and BPSK modulation are applied to the PUSCH and information indicating whether pi / 2 BPSK modulation is applied to the UL DMRS.

[0021] Transmitting the information indicating whether transform precoding and pi / 2 BPSK modulation are applied to the PUSCH may include transmitting, through higher layer signaling, the information indicating whether transform precoding and pi / 2 BPSK modulation are applied to the PUSCH.

[0022] When transform precoding is not applied to the PUSCH or when pi / 2 BPSK modulation is not applied to the PUSCH, the DMRS may be identified by using a sequence having a second PAPR.

[0023] The first UL DMRS may include a PUSCH DMRS and a PUCCH DMRS.

[0024] According to an aspect of the present disclosure, a base station for receiving a UL reference signal in a wireless communication system is provided. The base station includes a transceiver and at least one processor, the processor being connected to the transceiver and configured to: send information indicating whether transform precoding and pi / 2 BPSK modulation are applied to PUSCH to a UE; send information indicating whether pi / 2 BPSK modulation is applied to UL DMRS to the UE; and receive from the UE a DMRS identified based on the information indicating whether transform precoding and pi / 2 and BPSK modulation are applied to PUSCH and the information indicating whether pi / 2 BPSK modulation is applied to UL DMRS.

[0025] The DMRS may be identified by using a sequence having a first PAPR characteristic generated based on information indicating whether transform precoding and pi / 2 and BPSK modulation are applied to the PUSCH and information indicating whether pi / 2 BPSK modulation is applied to the UL DMRS.

[0026] The at least one processor may also be configured to send, through higher layer signaling, information indicating whether transform precoding and pi / 2 BPSK modulation are applied to the PUSCH.

[0027] When transform precoding is not applied to the PUSCH or when pi / 2 BPSK modulation is not applied to the PUSCH, the DMRS may be identified by using a sequence having a second PAPR.

[0028] UL DMRS may include PUSCH DMRS and PUCCH DMRS.

[0029] Other aspects, advantages, and salient features of the present disclosure will become apparent to those skilled in the art from the following detailed description which discloses various embodiments of the present disclosure in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0031] Figure 1 The structure of a time-frequency domain according to an embodiment of the present disclosure is shown, the time-frequency domain being a radio resource domain in which data or a control channel is transmitted in a downlink (DL) in a new radio (NR) system;

[0032] Figure 2 The structure of the time-frequency domain according to an embodiment of the present disclosure is shown, the time-frequency domain being a radio resource domain, in which data or a control channel is transmitted in an uplink (UL) in an NR system;

[0033] Figure 3 The structure of a synchronization signal-physical broadcast channel block (SS-PBCH) of an NR system according to an embodiment of the present disclosure is shown;

[0034] Figure 4 The random access procedure in the NR system according to an embodiment of the present disclosure is shown;

[0035] Figure 5 The UL physical channel used in the random access process of the NR system according to an embodiment of the present disclosure is shown;

[0036] Figure 6 A resource region in which a data channel is transmitted in an NR system according to an embodiment of the present disclosure is shown;

[0037] Figure 7 The codebook-based UL transmission process according to an embodiment of the present disclosure is shown;

[0038] Figure 8 The non-codebook based UL transmission process according to an embodiment of the present disclosure is shown;

[0039] Fig. 9 An example of a pi / 2 binary phase shift keying (BPSK) constellation according to an embodiment of the present disclosure is shown;

[0040] Fig.10 The process of configuring a UL waveform and a pi / 2 BPSK higher layer and transmitting a UL channel according to an embodiment of the present disclosure is shown;

[0041] Fig.11An example of a method for determining a physical uplink shared channel (PUSCH) / physical uplink control channel (PUSCH) demodulation reference signal (DMRS) sequence according to an embodiment of the present disclosure is shown;

[0042] Fig.12 An example of a method for determining a PUSCH / PUCCH DMRS sequence based on a type of random access according to an embodiment of the present disclosure is shown;

[0043] Fig.13 An example of a method for determining a PUSCH / PUCCH DMRS sequence based on the type of UL grant downlink control information (DCI) format according to an embodiment of the present disclosure is shown;

[0044] Fig.14 is a block diagram showing an internal structure of a terminal according to an embodiment of the present disclosure; and

[0045] Fig.15 is a block diagram showing an internal structure of a base station (BS) according to an embodiment of the present disclosure.

[0046] Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures. DETAILED DESCRIPTION

[0047] The following description is provided with reference to the accompanying drawings to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in understanding, but these specific details should be considered as exemplary only. Therefore, those skilled in the art will recognize that various changes and modifications of the various embodiments described herein may be made without departing from the scope and spirit of the present disclosure. In addition, for the sake of clarity and brevity, descriptions of well-known functions and configurations may be omitted.

[0048] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and is not intended to limit the present disclosure as defined by the appended claims and their equivalents.

[0049] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0050] For the same reason, some elements will be enlarged, omitted or simplified in the accompanying drawings. The size of each element does not fully reflect the actual size of the element. In each of the accompanying drawings, the same or corresponding elements will be cited with the same reference numerals.

[0051] With reference to the embodiments of the present disclosure described below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the methods for achieving them will be apparent. However, the present disclosure is not limited to the disclosed embodiments of the present disclosure, but can be implemented in various ways, and the embodiments of the present disclosure are provided to complete the disclosure of the present disclosure and allow those of ordinary skill in the art to understand the scope of the present disclosure. The present disclosure is limited by the categories of the claims. Throughout the specification, the same reference numerals represent the same elements.

[0052] Throughout the present disclosure, the expression “at least one of a, b, and c” indicates only a, only b, only c; both a and b; both a and c; both b and c; all of a, b, and c; or variations thereof.

[0053] Examples of the terminal may include a user terminal (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, a multimedia system capable of performing a communication function, and the like.

[0054] In this disclosure, a controller may also be referred to as a processor.

[0055] Throughout the specification, a layer (or layer device) may also be referred to as an entity.

[0056] At the same time, it is known to those of ordinary skill in the art that the combination of the blocks of the flowchart and the flowchart can be represented and executed by computer program instructions. These computer program instructions can also be stored in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the instructions implemented by the processor of the computer or programmable data processing device will produce a method for performing the functions specified in one or more boxes of the flowchart and / or block diagram. These computer program instructions can also be stored in a computer-usable or computer-readable memory, and the memory can instruct the computer or other programmable data processing device to act in a specific manner, so that the instructions stored in the computer-usable or computer-readable memory produce a product including instructions for implementing the functions specified in one or more boxes of the flowchart and / or block diagram. The computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are performed on the computer or other programmable device, thereby generating a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more boxes of the flowchart and / or block diagram.

[0057] In addition, each box represents a module, a code segment or a code portion, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in other implementations, the functions mentioned in the box may not occur in the indicated order. For example, depending on the functions involved, two boxes shown in succession can actually be executed substantially simultaneously, or boxes can sometimes be executed in reverse order.

[0058] In the current embodiment, the term "unit" as used herein refers to a software or hardware component that performs a specific task, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, the meaning of "unit" is not limited to software or hardware. "Unit" can be advantageously configured to reside on an addressable storage medium and configured to reproduce one or more processors. Therefore, for example, "unit" can include components (such as software components, object-oriented software components, class components and task components), processes, functions, attributes, programs, subroutines, program code fragments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and variables. The functions provided for components and "units" can be combined into fewer components and "units", or further divided into additional components and "units". In addition, components and "units" can be implemented to perform one or more central processing units (CPUs) in a device or a secure multimedia card.

[0059] Wireless communication systems have evolved from initially providing voice-oriented services to broadband wireless communication systems that provide high-speed and high-quality packet data services, such as communication standards such as 3rd Generation Partnership Project (3GPP) High Speed ​​Packet Access (HSPA), Long Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-Advanced (LTE-A or E-UTRA Evolution), 3GPP2 High Rate Packet Data (HRPD), Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.16e, etc. As a fifth generation (5G) wireless communication system, 5G or New Radio (NR) communication standards have been established.

[0060] In the Rel-15NR system, in order to improve the coverage of the uplink (UL) data channel, in the UL transmission of the terminal, pi / 2 binary phase shift keying (BPSK) modulation or quadrature phase shift keying (QPSK) with a fixed constellation having a lower peak-to-average power ratio (PAPR) than BPSK can be applied. At the same time, in the Rel-15NR system, QPSK is used for the UL demodulation reference signal (DMRS), and the PAPR of the orthogonal frequency division multiplexing (OFDM) symbol carrying the UL DMRS becomes a bottleneck, which makes it difficult to expect substantial improvement in UL coverage. To solve this problem, in the Rel-16NR, a DMRS based on pi / 2BPSK may be newly introduced. UL coverage improvement based on pi / 2 BPSK is not a necessary factor for any network environment. In particular, the Rel-15 terminal or base station may not understand the Rel-16 new reference signal (RS) sequence, which requires a correct choice of whether to configure UL transmission based on pi / 2 BPSK or support the function of the terminal. According to the present disclosure, PI / 2 BPSK-based UL RS transmission may be effectively indicated or determined according to a channel or procedure having an impact on UL transmission, such as a random access channel (RACH), UL grant, etc.

[0061] The base station performs resource allocation for the terminal and may be at least one of a node B, a next generation node B (gNB), an evolved node B (eNode B), a node B, a base station (BS), a wireless access unit, a base station controller, and a node on a network. The terminal may include a UE, a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. Although the embodiments of the present disclosure are described by using an NR system or a long term evolution (LTE) / LTE-Advanced (LTE-A) system as an example, the embodiments of the present disclosure may also be applied to other communication systems having similar technical backgrounds or channel forms. In addition, the embodiments of the present disclosure may also be applied to other communication systems by making some modifications based on the determination of the technician within the scope of the present disclosure without substantially departing from the scope of the present disclosure.

[0062] The present disclosure is applicable to both frequency division duplex (FDD) systems and time division duplex (TDD) systems.

[0063] Hereinafter, in the present disclosure, high-layer signaling is a method of transmitting a signal from a base station to a terminal by using a downlink (DL) data channel of a physical layer, or a method of transmitting a signal from a UE to a BS by using a UL data channel of a physical layer, and may be referred to as radio resource control (RRC) signaling, packet data convergence protocol (PDCP) signaling, or a medium access control (MAC) control element (CE).

[0064] Although the aforementioned examples have been described through multiple embodiments in the present disclosure, these examples are not independent, and one or more embodiments of the present disclosure may be applied simultaneously or in a complex manner.

[0065] In the NR system, as a representative example of a broadband wireless communication system, in the DL ( Figure 1 OFDM is used in 102) and in UL ( Figure 2 202) adopts both discrete Fourier transform extended OFDM (DFT-s-OFDM) and OFDM. UL refers to the wireless link through which the UE sends data or control signals to the base station, and DL refers to the wireless link through which the base station sends data or control signals to the UE. The above-mentioned multiple access scheme separates the data or control information of each user by allocating and operating the time-frequency resources on which the data or control information is carried for each user, so that the time-frequency resources do not overlap with each other, that is, orthogonality is achieved.

[0066] The 5G or NR system adopts a hybrid automatic repeat request (HARQ) scheme, which resends data at the physical layer when decryption fails in the initial transmission of the data. HARQ refers to a scheme in which, when a receiver cannot accurately decrypt (decode) data, the receiver sends information indicating the decoding failure, i.e., a negative acknowledgement (NACK), to the transmitter to allow the transmitter to resend the data at the physical layer. The receiver improves data reception performance by combining the data resent by the transmitter with the data that previously failed to decode. When the data is accurately decoded, the receiver sends information indicating successful decoding, i.e., an acknowledgement (ACK), to the transmitter to allow the transmitter to send new data.

[0067] Figure 1 The structure of the time-frequency domain according to an embodiment of the present disclosure is shown, which time-frequency domain is a radio resource domain, where data or control channels are transmitted in DL in the NR system.

[0068] refer to Figure 1 , the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. In the frequency domain, the minimum transmission unit is a subcarrier, and in the NR system, a total of five subcarrier spacings or parameter sets (numerology) are supported, as shown in Table 1. In Table 1, Δf represents the absolute value of the parameter set, and μ represents the index of each parameter set.

[0069] Table 1

[0070]

[0071] In NR systems, a terminal can be configured with one or more bandwidth parts (BWPs), including some frequency bands in the entire system band, and the position of the starting resource block (RB) in the i-th BWP and the length of the RB can be configured by higher-layer parameters and The base station can indicate one of the BWPs configured by downlink control information (DCI) and transmit a DL signal, or cause the terminal to transmit an UL signal in the entire frequency band of the indicated BWP or a portion thereof. One bandwidth of a BWP can be composed of a total of There are 104 subcarriers. Here, may indicate the number of subcarriers constituting one RB and may be

[0072] In the time domain, the smallest transmission unit is the OFDM symbol, and N symb OFDM symbols 102 may constitute a time slot 106, where N symb =14. One subframe 103 may include one or more time slots, and ten subframes may constitute one radio frame 114. The number of time slots constituting one subframe may be determined according to a parameter set, As shown in Table 2.

[0073] Table 2

[0074]

[0075] The length of the subframe can be 1.0ms, and based on the subcarrier spacing of 15kHz (μ=15kHz), the length of the time slot can be inversely proportional to the subcarrier spacing (for example, μ=30kHz, 60kHz, 120kHz, 240kHz, with lengths of 0.5ms, 0.25ms and 0.125ms respectively).

[0076] In the time-frequency domain, the basic unit of resources may be a resource element (RE) 112 and may be indicated as an OFDM symbol index and a subcarrier index. An RB or physical RB (PRB) 108 may be composed of N in the time domain. sumb consecutive OFDM symbols 102 and in the frequency domain Thus, one RB 108 is defined by As described above, in the NR system, Nsymb=7, and NRB=12.

[0077] Figure 2 The structure of the time-frequency domain according to an embodiment of the present disclosure is shown, which time-frequency domain is a radio resource domain, where data or control channels are transmitted in the UL in the NR system.

[0078] refer to Figure 2 , the horizontal axis represents the symbThe vertical axis represents the time domain with OFDM symbols 202, and the vertical axis represents the frequency domain with subcarriers 204. Details such as RE 212, RB 208, time slot 206, subframe 205, radio frame 214, etc. configured based on the parameter set are similar to Figure 1 The description of DL is similar to that of DL, so it will not be described again. The base station can be configured to use DFT-s-OFDM and the cyclic prefix (CP) OFDM used in the DL of the UL waveform as needed. A UE configured to use DFT-s-OFDM (or transform precoding) can apply a discrete Fourier transform (DFT) to the data before applying an inverse fast Fourier transform (IFFT) to the transmission symbol. Therefore, the transmission symbol sent by the terminal can obtain a single carrier characteristic, and its PAPR characteristic becomes better than CP OFDM, so that the terminal can obtain additional coverage improvement effect in UL transmission.

[0079] Figure 3 A synchronization signal (SS) / physical broadcast channel (PBCH) block 300 in an NR system according to an embodiment of the present disclosure is shown.

[0080] refer to Figure 3 , the SS / PBCH block 300 may include a primary synchronization signal (PSS) 301 , a secondary synchronization signal (SSS) 303 , and a PBCH 302 .

[0081] PSS 301 and SSS 303 may be transmitted through 12 RBs 305 on the frequency axis and one OFDM symbol 304 on the time axis. In the NR system, a total of 1008 different cell identifiers (IDs) may be defined, and PSS 301 may have three different values ​​and SSS 303 may have 336 different values ​​according to the physical layer ID of the cell. By detecting PSS 301 and SSS 303, the terminal may know one of the 1008 cell IDs based on a combination of PSS 301 and SSS 303. This may be expressed as Equation 1.

[0082]

[0083] N can be estimated from SSS 303 (1) ID , and its value can be between 0 and 335. N can be estimated from PSS 301 (2) ID , and its value can be between 0 and 2. (1) ID and N (2) ID The estimated cell ID is N cell ID .

[0084] The PBCH 302 may be transmitted through 24 RBs 306 on the frequency axis and 2 OFDM symbols 304 on the time axis. In the PBCH 302, various system information referred to as a master information block (MIB) may be transmitted, and includes the following.

[0085] -systemFrameNumber

[0086] -subCarrierSpacingCommon

[0087] -ssb-SubcarrierOffset

[0088] -dmrs-TypeA-Position

[0089] -pdcch-ConfigSI B1

[0090] -cell Barred

[0091] -intraFreqReselection

[0092] -spare

[0093] As described above, the SS / PBCH block 300 may include the PSS 301, the SSS 303, and the PBCH 302, and may be mapped to a total of four OFDM symbols on the time axis. Figure 3 , 12 RBs 305 corresponding to the transmission bandwidth of PSS 301 and SSS 303 and 24 RBs 306 corresponding to the transmission bandwidth of PBCH 302 are different from each other, so that in the OFDM symbol in which PSS 301 and SSS303 are transmitted in the 24 RBs 306 of the transmission bandwidth corresponding to PBCH 302, 6 RBs 307 and 6 RBs 308 exist on both sides except for the central 12 RBs in which PSS 301 and SSS 303 are transmitted, and the 6 RBs 307 and 6 RBs 308 can be used to transmit another signal or can be empty.

[0094] The SS / PBCH blocks may be transmitted in the same analog beam. That is, PSS 301, SSS 303, and PBCH 302 may be transmitted through the same beam. The analog beam is not applicable to the frequency axis, so that the same analog beam is applied to any frequency axis RB in a specific OFDM symbol to which a specific analog beam is applied. That is, the four OFDM symbols in which PSS 301, SSS 303, and PBCH 302 are transmitted may be transmitted through the same analog beam.

[0095] At the same time, the terminal can decode the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) based on the system information included in the received MIB, and obtain the system information block (SIB), which can include at least UL cell bandwidth, random access parameters, paging parameters, parameters related to uplink power control, etc. The terminal can form a radio link with the network through a random access process based on the synchronization and system information with the network obtained in the cell search process. In the random access scheme, a contention-based scheme or a non-contention-based scheme can be used. When the terminal performs cell selection and reselection in the initial access phase of the cell, the contention-based access scheme can be used to move from RRC_IDLE to RRC_CONNECTED. Non-contention-based random access can be used for reconfiguration of UL synchronization in the arrival, switching or positioning of DL data.

[0096] Figure 4 The contention-based random access procedure in the NR system according to an embodiment of the present disclosure is shown.

[0097] refer to Figure 4 , the random access process may include four operation processes. In operation 401, the terminal may send a random access preamble so that the base station may estimate the transmission timing of the terminal. The random access preamble may be transmitted through a UL physical layer channel corresponding to a physical random access channel (PRACH), and will be described in detail below. In operation 401 (Msg. 1) of sending the random access preamble, the base station may recognize that there is a random access attempt, and estimate the delay time between the terminal and the base station to adjust the UL transmission timing.

[0098] In operation 402 (Msg.2), the base station may send a random access response (RAR) for the detected random access attempt. The RAR may be transmitted through the PDSCH and may include the following message:

[0099] - Random access preamble sequence index detected by the network;

[0100] - Temporary Cell Radio Network Temporary Identifier (TC-RNTI);

[0101] - Uplink scheduling grant; and

[0102] - Timing advance value.

[0103] The terminal that has sent the preamble can monitor the PDCCH of the RAR within the set time. The frequency domain control information of the PDSCH in which the RAR is transmitted can be obtained from the DCI transmitted through the PSS of the PDCCH configured with the random access radio network temporary identifier (RA-RNTI). The terminal that has received the RAR can adjust the uplink transmission timing and perform the next operation.

[0104] In operation 403 (Msg.3), the terminal may send an L2 / L3 message for a remote radio control (RRC) connection request to the base station. The terminal may send a message such as an ID or HARQ of the terminal by using the uplink physical layer resources allocated in the random access response of operation 402. In this case, the message may be transmitted through a physical uplink shared channel (PUSCH), which is an uplink physical channel configured with a TC-RNTI.

[0105] In operation 403 (Msg.4), the terminal may receive a downlink message for contention resolution and RRC connection establishment from the base station. The contention resolution message may be transmitted through the PDSCH, and scheduling information of the PDSCH may be obtained from DCI transmitted through the PDCCH configured with a cell radio network temporary identifier (C-RNTI).

[0106] Since the non-contention random access procedure does not perform contention resolution, operations 401 and 402 may be performed.

[0107] Figure 5 The UL physical channels used in the random access process of the NR system according to an embodiment of the present disclosure are shown.

[0108] refer to Figure 5 ,like Figure 4 As indicated in the random access process in operation 401, the terminal may transmit a random access preamble by using PRACH 501 in PUSCH 502. In each cell, there are 64 available preamble sequences, and 4 long preamble formats and 9 short preamble formats may be used according to the transmission form. The terminal may generate 64 preamble sequences by using a root sequence index and a cyclic shift value, which are signaled by system information, and randomly select a sequence to use as a preamble.

[0109] The network can notify the terminal of the time-frequency resources that can be used for PRACH through SIB or upper layer signaling. The frequency resources can indicate the starting RB point of the transmission to the terminal, and the number of RBs used can be determined according to the preamble format and the applied subcarrier spacing. The time resources can notify the preconfigured PRACH configuration period, the subframe index including the PRACH opportunity and the start symbol, the number of PRACH opportunities in the time slot, etc. through the PRACH configuration index 0 to 255.

[0110] Table 3

[0111]

[0112]

[0113] Figure 6 A resource region in which a data channel is transmitted in an NR system according to an embodiment of the present disclosure is shown.

[0114] refer to Figure 6, the terminal may monitor or search for a PDCCH 610 in a downlink control channel (hereinafter referred to as PDCCH) region (hereinafter referred to as a control resource set (CORESET) or a search space) configured by an upper layer signal from a base station. The downlink control channel region may include a time resource 614 in a time domain and a frequency resource 612 in a frequency domain, wherein the time resource 614 may be configured in units of symbols, and the frequency resource 612 may be configured in units of RBs or RB groups. When the terminal detects a PDCCH 610 in a time slot i 600, the terminal may obtain a DCI transmitted by the detected PDCCH 610. The terminal may obtain scheduling information of a DL data channel or a UL data channel through the received DCI. That is, the DCI may include at least one resource region (or PDSCH transmission region) in which the terminal must receive a DL data channel (hereinafter referred to as PDSCH) sent from a BS or a resource region allocated from a BS to a terminal for transmitting a UL data channel (PUSCH). For example, in the following case, the terminal can be scheduled in the transmission of the UL data channel (PUSCH): the terminal that has received the DCI can obtain the time slot index or offset information K that must receive the PUSCH through the DCI, and can determine the PUSCH transmission time slot index. For example, the terminal can determine that the terminal is scheduled to send the PUSCH in the time slot (i+K) 605 based on the time slot index i 600 of the received PDCCH 610 through the received offset information K. The terminal can determine the PUSCH start symbol or time in the time slot (i+K) 605 based on the CORESET of the received PDCCH 610 through the received offset information K. The terminal can obtain information about the PUSCH time-frequency resource region 640 from the DCI in the time slot (i+K) 605 for PUSCH transmission. The PUSCH transmission frequency resource region information 630 can be information based on PRB or PRB group. The PUSCH transmission frequency resource region information 630 may be a region included in an initial UL bandwidth (BW) or an initial UL BWP determined or configured for the terminal through an initial access procedure. When the terminal is configured with a UL BW 635 or UL BWP through an upper layer signal, the PUSCH transmission frequency resource region information 630 may be a region included in the UL BW 635 or UL BWP configured through an upper layer signal.

[0115] The PUSCH transmission time resource region information 625 may be symbol-based or symbol-group-based information or information indicating absolute time information. The PUSCH transmission time resource region information 625 may be represented as a combination of a PUSCH transmission start time or symbol and a PUSCH length or a PUSCH end time or symbol, and may be included in the DCI as a field or value. The PUSCH transmission time resource region information 625 may be represented as a PUSCH transmission start time or symbol and a PUSCH length or a PUSCH end time or symbol, and may be included in the DCI as fields or values, respectively. The terminal may send PUSCH in the PUSCH time-frequency resource region 640 determined by the DCI.

[0116] In the NR system, for effective control channel reception of the terminal, various DCI formats can be provided according to the purpose, as shown in Table 4.

[0117] Table 4

[0118]

[0119]

[0120] For example, the base station may use DCI format 0_0 or DCI format 0_1 ​​to schedule the PUSCH in one cell.

[0121] When DCI format 0_0 is transmitted together with a cyclic redundancy check (CRC) scrambled by a cell radio network temporary identifier (C-RNTI), a configured scheduling RNTI (CS-RNTI), or a new RNTI, it may include at least the following information.

[0122] - Identifier of DCI format (1 bit): DCI format indicator, and is always set to 1;

[0123] - Frequency domain resource allocation: indicates frequency axis resource allocation;

[0124] -Time domain resource allocation: represents the time axis resource allocation;

[0125] - Frequency hopping flag: an indicator indicating whether frequency hopping is applied;

[0126] - Modulation and coding scheme: indicates the modulation order and coding rate used in PUSCH transmission;

[0127] - New Data Indicator: Indicates whether the PUSCH is initially transmitted or retransmitted according to the handover

[0128] - Redundancy version: indicates the redundancy version used in PUSCH transmission;

[0129] -HARQ process number: indicates the number of HARQ processes used for PUSCH transmission;

[0130] When DCI format 0_1 ​​is transmitted together with a CRC scrambled by a C-RNTI, a CS-RNTI, a semi-persistent channel state information (CSI) RNTI (SP-CSI-RNTI), or a new RNTI, it may include at least the following information.

[0131] - Identifier of DCI format (1 bit): DCI format indicator, and is always set to 1;

[0132] - Carrier indicator: an indicator indicating the index of the cell carrier in which the data is transmitted;

[0133] -BWP indicator: an indicator indicating the BWP in which the data is transmitted;

[0134] - Frequency domain resource allocation: indicates frequency axis resource allocation;

[0135] -Time domain resource allocation: represents the time axis resource allocation;

[0136] - Frequency hopping flag: an indicator indicating whether frequency hopping is applied;

[0137] - Modulation and coding scheme: indicates the modulation order and coding rate used in PUSCH transmission;

[0138] - New Data Indicator: Indicates whether the PUSCH is initially transmitted or retransmitted according to the handover

[0139] - Redundancy version: indicates the redundancy version used in PUSCH transmission;

[0140] -HARQ process number: indicates the number of HARQ processes used for PUSCH transmission;

[0141] - Downlink Allocation Index (DAI): DAI indicator;

[0142] Transmit power control (TPC) command for scheduled PUSCH: PUSCH power control indicator;

[0143] - Sounding Reference Signal (SRS) Resource Indicator (SRI): an SRS resource indicator indicating that the upper layer parameter "usage" is one of the SRS resources included in the SRS resource set designated as "codebook" or "non-codebook";

[0144] - Precoding information and number of layers (Transmit Precoding Matrix Indicator (TPMI)): indicates the number of layers and precoding information used by the terminal for UL transmission when the upper layer parameter "txConfig" is configured as "Codebook"; and

[0145] - Antenna Port: Indicates the demodulation reference signal port (DMRS) and code division multiplexing (CDM) group index used for UL transmission.

[0146] According to an embodiment of the present disclosure, the base station may use DCI format 2_2 to control the UL (PUSCH or physical uplink control channel (PUSCH)) transmission power of the terminal. DCI format 2_2 may include a total of N blocks 1 to N, each of which may include at least the following information:

[0147] - Closed loop indicator (0 or 1 bit): indicates the PUSCH or PUCCH power control adjustment status; and

[0148] -TPC command (2 bits): indicates when the CRC of DCI format 2_2 is scrambled with TPC-PUSCH-RNTI according to Table 5 PUCCH，b，f，c and δ SRS，b，f，c The accumulated value or absolute value of; or when the CRC of DCI format 2_2 is scrambled with TPC-PUCCH-RNTI, indicating the delta according to Table 6 PUCCH，b，f，c The accumulated value of .

[0149] Table 5

[0150]

[0151] Table 6

[0152] TPC Command Field <![CDATA[Accumulated value δ PUCCH，b，f，c [dB]]]> 0 -1 1 0 2 1 3 3

[0153] From the information contained in DCI format 0_1, it can be seen that the NR system can provide two UL transmission methods: "codebook-based UL transmission" and "non-codebook-based UL transmission".

[0154] Figure 7 A codebook-based UL transmission process according to an embodiment of the present disclosure is shown.

[0155] refer to Figure 7 , the terminal can send SRS according to the configuration or command of the base station. The base station can correctly receive the UL signals of different terminals and measure interference. Thereafter, based on the received SRS signal interference signal, the base station can determine the UL resources, SRS resources, UL codebook modulation and coding scheme (MCS), etc. used by the terminal. Through a UL grant such as DCI format 0_1, the base station can indicate to the terminal the time domain / frequency domain allocation, SRI, TPMI, etc. corresponding to the determined information. For codebook-based UL transmission, the base station can directly indicate the precoding matrix applied to PUSCH and UL DMRS through TPMI. When the terminal successfully receives the UL grant, the terminal can perform UL transmission on PUSCH, SRS, UL DMRS, etc.

[0156] Figure 8 A non-codebook based UL transmission process according to an embodiment of the present disclosure is shown.

[0157] refer to Figure 8 , the base station may send a DL signal such as a CSI reference signal (CSI-RS) to the terminal to allow the terminal to determine the transmit / receive beam direction based on the DL signal. Thereafter, based on the configuration or instruction of the base station, the terminal may send an SRS in the measured beam direction in the associated CSI-RS. The base station may correctly receive UL signals from different terminals and measure interference. Thereafter, based on the received SRS signal interference signal, the base station may determine the UL resources, SRS resources, etc. used by the terminal. Through a UL grant such as DCI format 0_1, the base station may indicate to the terminal the time domain / frequency domain allocation, SRI, etc. corresponding to the determined information. For codebook-based UL transmission, the base station may implicitly indicate the precoding applied to PUSCH and UL DMRS through SRI. When the terminal successfully receives the UL grant, the terminal may perform UL transmission for PUSCH, SRS, UL DMRS, etc. based on the received UL grant.

[0158] As reference Figure 2 As described, in the UL of the NR system, DFT-s-OFDM and CPOFDM with lower PAPR can be supported. The base station can configure the terminal to use DFT-s-OFDM when the UL coverage is limited, thereby ensuring lower power compensation and ensuring additional coverage corresponding to the difference. In addition, in the Rel-15 NR system, PUSCH or pi / 2 BPSK modulation of PUSCH can be supported. The constellation of pi / 2 BPSK modulation can be as follows.

[0159]

[0160] In Equation 2, b(i) represents the i-th input bit sequence, and d(i) represents the i-th output modulation symbol.

[0161] Fig. 9 An example of a pi / 2 BPSK constellation according to an embodiment of the present disclosure is shown.

[0162] Refer to Equation 2 and Fig. 9, the constellation of pi / 2 BPSK can change from 900 to 905 or from 905 to 900 with time (i). For example, assuming that at a time point where i mod 2=0 is satisfied, the output modulation symbol exists at position 910. In this case, the next output modulation symbol can satisfy (i+1) mod2=1, so that the output modulation symbol can be moved to 915 or 920. That is, for pi / 2 BPSK, zero crossing may not occur. More specifically, compared with general BPSK or QPSK in which the probability of zero crossing varies with time between output modulation symbols, pi / 2 BPSK has a smaller phase shift width that varies with time between output modulation symbols, and thus has lower PAPR performance.

[0163] In the NR system, the base station can instruct the terminal to use DFT-s-OFDM according to one of the conditions shown in Table 7.

[0164] Table 7

[0165]

[0166] In the NR system, the BS can indicate to the terminal configured to use DFT-s-OFDM whether to use PUSCH or PUCCH pi / 2 BPSK through higher layer signaling, and when the terminal is instructed to use pi / 2 BPSK for PUSCH transmission, the terminal can apply q=1 in Tables 8 and 9 (when the terminal is not instructed to use pi / 2 BPSK for PUSCH transmission, the terminal can apply q=2 in Tables 8 and 9, that is, use QPSK in the corresponding part), and when the terminal is instructed to use pi / 2 BPSK for PUCCH transmission, the terminal can use pi / 2 BPSK instead of QPSK.

[0167] Table 8 is an MCS index table for PUSCH transform precoding and 64QAM.

[0168] (MCS index table for PUSCH with transform precoding and 64QAM)

[0169] Table 8

[0170]

[0171]

[0172] Table 9 corresponds to MCS index Table 2 for PUSCH transform precoding and 64QAM.

[0173] (MCS index table 2 for PUSCH with transform precoding and 64QAM)

[0174] Table 9

[0175]

[0176]

[0177] Meanwhile, in the Rel-15 NR system, for PUSCH DMRS and PUSCH DMRS for DFT-s-OFDM, a QPSK-based computer generated sequence (CGS) may be provided as shown in Table 10.

[0178] Table 10

[0179]

[0180] Based on Table 10 The PUSCH DMRS and PUSCH DMRS sequence for DFT-s-OFDM may be generated using Equation 3 and Equation 4.

[0181]

[0182] When DFT-s-OFDM is used, Equation 3 is a PUSCH DMRS sequence generation method, where δ=1 and α=0 are used, and Defined as "the scheduling bandwidth for uplink transmissions, expressed as the number of subcarriers".

[0183]

[0184] When DFT-s-OFDM is used, Equation 4 is a PUCCH DMRS sequence generation method for PUCCH format 3 or format 4, where it can be defined as in Equation 5

[0185]

[0186] In Equation 5, α 2 , α 3 , α 5 can be a positive integer, and s can be 3 or 4.

[0187] Hereinafter, for the convenience of description, Equation 3 and Equation 4 will be referred to as Rel-15 PUSCH DMRS or Rel-15 PUSCH DMRS sequence. The Rel-15 PUSCH / PUCCH DMRS sequence may be a QPSK-based sequence as described above, and may have a higher PAPR than pi / 2 BPSK, so that when PUSCH or PUCCH is modulated with pi / 2 BPSK, the PAPR of the OFDM symbol transmitting RS in the UL transmission slot becomes higher than the PAPR of the OFDM symbol transmitting data. That is, this means that the terminal needs to perform greater power compensation or a greater amount of limiting on the OFDM symbol transmitting RS, and ultimately, the reception performance of the OFDM symbol transmitting RS may be reduced, thereby limiting the reception performance of the UL slot.

[0188] In the present disclosure, in order to solve the aforementioned problem, a method may be provided, which defines a sequence collectively referred to as a Rel-16 PUSCH / PUCCH DMRS sequence and configures the defined sequence for a terminal according to an environment.

[0189] First embodiment

[0190] According to an embodiment of the present disclosure, a Rel-16 PUSCH / puchc DMRS sequence may be defined, whose PAPR characteristics are similar to those of a PUSCH or PUCCH modulated with pi / 2 BPSK.

[0191] For a PUSCH or PUCCH DMRS sequence of length 12, a PUSCH or PUCCH DMRS sequence of length 18, and a PUSCH or PUCCH DMRS sequence of length 24, pi / 2 BPSK modulation of Equation 2 may be performed based on the values ​​of Tables 11 to 13, and DFT (or transform precoding) may be performed to obtain the final Rel-16 PUSCH / PUCCH DMRS sequence.

[0192] Table 11 CGS of length 12 for pi / 2 BPSK

[0193]

[0194] Table 12 CGS of length 18 for pi / 2 BPSK

[0195]

[0196] Table 13 CGS of length 24 for pi / 2 BPSK

[0197]

[0198] For Rel-16 PUSCH / PUCCH DMRS sequences of length 30 or longer, the sequence can be generated according to the following rules:

[0199] -For sequences of length 30 or more, a pi / 2 BPSK modulated DMRS for PUSCH may be generated based on a Gold sequence, followed by pi / 2 BPSK modulation, followed by transform precoding, which results from a DMRS type 1 comb structure; (For sequences of length 30 or more, a pi / 2 BPSK modulated DMRS for PUSCH may be generated based on a Gold sequence, followed by pi / 2 BPSK modulation, followed by transform precoding, which results from a DMRS type 1 comb structure)

[0200] -For sequences of length 30 or more, a pi / 2 BPSK modulated DMRS for PUSCH may be generated based on the Gol d sequence, followed by pi / 2 BPSK modulation, followed by transform precoding; (For sequences of length 30 or more, a pi / 2 BPSK modulated DMRS for PUCCH may be generated based on the Gol d sequence, followed by pi / 2 BPSK modulation, followed by transform precoding.)

[0201] For the convenience of description in the following embodiments of the present disclosure, a PUSCH or PUCCH DMRS sequence generated according to one of the methods of the aforementioned first embodiment of the present disclosure will be referred to as a Rel-16 PUSCH / PUCCH DMRS sequence.

[0202] Second embodiment

[0203] According to an embodiment of the present disclosure, a signaling structure, a terminal, and a method for selecting one of a Rel-15 PUSCH / PUCCH DMRS sequence and a Rel-16 PUSCH / PUCCH DMRS sequence may be provided.

[0204] Fig.10 A process of configuring a UL waveform and a pi / 2 BPSK higher layer and transmitting a UL channel according to an embodiment of the present disclosure is shown.

[0205] refer to Fig.10 , a block diagram showing an operation in which a base station indicates to a terminal whether Rel-16 PUSCH / PUCCH DMRS is available and the terminal performs PUSCH / PUCCH transmission. Fig.10, in operation 1000, the base station may notify through SIB or RRC configuration whether DFT-s-OFDM (or transform precoding) is applied to PUSCH or PUCCH. Then, in operation 1010, the base station may notify through RRC configuration whether pi / 2 BPSK is applied to PUSCH or PUCCH transmission. When the terminal reports through UE capability signaling that it is possible to apply pi / 2 BPSK to PUSCH DMRS or PUCCH DMRS (i.e., the terminal is capable of generating Rel-16 PUSCH / PUCCH DMRS sequence), in operation 1020, the base station may notify the terminal through higher layer signaling whether pi / 2 BPSK is applied to PUSCH DMRS or PUCCH DMRS. In operation 1030, the terminal may perform transmission on the UL timeslot based on the received information. The signaling in operation 1020 may be performed using independent RRC parameters, but for a terminal that has reported UE capabilities for Rel-16 PUSCH / PUCCH DMRS, the signaling in operation 1010 may be preset to replace the signaling in operation 1020, or may be set to higher layer signaling. (That is, for a terminal capable of generating a Rel-16 PUSCH / PUCCH DMRS sequence, the Rel-16 PUSCH / PUCCH DMRS sequence may be used depending on whether pi / 2 BPSK is applied to PUSCH or PUCCH.)

[0206] When there is an independent signal for notifying whether to use pi / 2 BPSK of PUSCH / PUCCH and whether to use pi / 2 BPSK of PUSCH / PUCCHDMRS, the base station can ensure that "whether to use pi / 2 BPSK of PUSCH and whether to use pi / 2 BPSK of PUSCH DMRS" match, or ensure that "whether to use pi / 2 BPSK of PUCCH" and "whether to use pi / 2 BPSK of PUCCHDMRS" match. By doing so, the limitation of the coverage of Rel-16 terminals due to the bottleneck of one of PUSCH / PUCCH and PUSCH / PUCCH DMRS can be minimized.

[0207] Fig.11 An example of a method of determining a PUSCH / PUCCH DMRS sequence according to an embodiment of the present disclosure is shown.

[0208] refer to Fig.11 Based on the aforementioned signaling structure, the terminal can determine whether to use the Rel-15 PUSCH / PUCCH DMRS sequence or the Rel-16 PUSCH / PUCCH DMRS sequence, such as Fig.11 Similar to Fig.10In the embodiment of the present disclosure shown in FIG. 1 , in operation 1100, the terminal may receive various higher layer configuration information, such as DFT-s-OFDM for UL transmission, pi / 2 BPSK for PUSCH / PUCCH, pi / 2 BPSK for PUSCH / PUCCH DMRS, etc. These three types of configuration information may be independently configured for various reasons, such as terminal-specific UL coverage, coexistence between terminals of different versions, etc. At the same time, in order to prevent unnecessary processing from being performed in the terminal and confusion in selecting the Rel-15 DMRS sequence and the Rel-16 DMRS sequence, the following may be followed: Fig.11 Determination order shown. First, in operation 1110, the terminal may determine whether to apply DFT-s-OFDM to PUSCH or PUCCH, and in operation 1140, for non-DFT-s-OFDM transmission (i.e., for UL transmission based on CP OFDM), the terminal may use the Rel-15 PUSCH / PUCCH DMRS sequence regardless of the determination result of operation 1120 or 1130. When DFT-s-OFDM is used for UL transmission, in operation 1120, the terminal may determine whether to apply pi / 2 BPSK to PUSCH or PUCCH; when pi / 2 BPSK is not used, in operation 1140, the terminal may use the Rel-15 PUSCH / PUCCH DMRS sequence regardless of the determination result of operation 1130. When DFT-s-OFDM is used for UL transmission and pi / 2 BPSK is applied to PUSCH / PUCCH, at operation 1130, the terminal may determine whether to apply pi / 2 BPSK to PUSCH DMRS or PUCCH DMRS, and at operation 1150, use a Rel-16 PUSCH / PUCCH DMRS sequence based on the determination result of operation 1130.

[0209] Third embodiment

[0210] According to an embodiment of the present disclosure, a method can be provided for performing a random access procedure. Figure 4 A method of selecting one of the Rel-15 PUSCH / PUCCH DMRS sequence and the Rel-16 PUSCH / PUCCH DMRS sequence in operation 403 (Msg.3) and operation 404 (ACK / NACK feedback, ACK / NACK for Msg.4).

[0211] Fig.12 An example of a method of determining a PUSCH / PUCCH DMRS sequence based on the type of random access according to an embodiment of the present disclosure is shown.

[0212] refer to Fig.12, shows a method for selecting a DMRS sequence for Msg.3 transmission performed by a terminal based on an RRC mode according to an embodiment of the present disclosure. Fig.12 In operation 1200, the terminal may receive various higher layer configuration information, such as DFT-s-OFDM for UL transmission, pi / 2 BPSK for PUSCH / PUCCH, pi / 2 BPSK for PUSCH / PUCCH DMRS, etc. In order to prevent the base station and the terminal from being confused when selecting a Rel-15 DMRS sequence and selecting a Rel-16 DMRS sequence, in operation 1210, in addition to the methods of the first and second embodiments of the present disclosure, an additional criterion may be determined based on the RRC connection state of the terminal. For example, when the terminal is in RRC connection mode and determines to use the Rel-16 DMRS sequence according to the methods of the first and second embodiments of the present disclosure, the terminal may determine that the higher layer configuration information is valid, and use the Rel-16 DMRS sequence for Msg.3 transmission in operation 1230. On the other hand, when the terminal is not in RRC connected mode, that is, in RRC inactive mode or RRC idle mode, although the method according to the first and second embodiments of the present disclosure determines to use the Rel-16 DMRS sequence, the terminal can determine that the high-layer configuration information has lost validity and use the Rel-15 DMRS sequence for Msg.3 transmission in operation 1220.

[0213] More specifically, the terminal may use at least one of the following methods to determine the DMRS sequence required for Msg.3 transmission.

[0214] - Method 1: Indicates whether to use Rel-15 or Rel-16 DMRS sequence for Msg. 3 by adding an independent higher layer parameter to RRC Information Element (IE) RACH-ConfigCommon or RACH-Configdedicated. Therefore, coexistence between Rel-15 terminals and Rel-16 terminals can be improved.

[0215] - Method 2: For Rel-16 terminals in which the higher layer parameter msg3-transformPrecoder is set to enabled (i.e., the terminal reports through UE capability signaling that it is capable of generating Rel-16 DMRS sequences), Rel-16 DMRS sequences can be used; in other cases, Rel-15 DMRS sequences can be used. Therefore, UL coverage can be maximized without additional signaling load.

[0216] - Method 3: For Rel-16 terminals (i.e., the terminal reports through UE capability signaling that it can generate Rel-16 DMRS sequences), when the PUSCH or PUCCH transmission power PPUSCH or P PUCCH When the Rel-16 DMRS sequence is greater than or equal to a specific value due to a TPC command, the Rel-16 DMRS sequence can be used for Msg.3 transmission. For example, the specific value can be indicated / configured by higher layer or L1 signaling, or it can be the UL maximum transmission power P of the terminal. CMAX preset values, etc.

[0217] More specifically, the terminal may use at least one of the following methods to determine the DMRS sequence required for ACK / NACK feedback transmission of Msg.4.

[0218] - Method 1: Indicates that ACK / NACK feedback transmission for Msg.4 uses Rel-15 or Rel-16 DMRS sequence by adding an independent higher layer parameter to RRC IE RACH-ConfigCommon or RACH-Configdedicated. Therefore, coexistence between Rel-15 terminals and Rel-16 terminals can be improved.

[0219] -Method 2: Based on the DMRS sequence determined for Msg.3, the Rel-16 terminal (i.e., the terminal reports through UE capability signaling that it can generate the Rel-16 DMRS sequence) can use the Rel-16 DMRS sequence for ACK / NACK feedback transmission of Msg.4; in other cases, the Rel-16 terminal can use the Rel-15 DMRS sequence. Therefore, the UL coverage can be maximized without additional signaling load.

[0220] - Method 3: For Rel-16 terminals (i.e., the terminal reports through UE capability signaling that it can generate Rel-16 DMRS sequences), when the PUSCH or PUCCH transmission power P PUSCH or P PUCCH When the Rel-16 DMRS sequence is greater than or equal to a specific value due to a TPC command, the Rel-16 DMRS sequence can be used for ACK / NACK feedback transmission of Msg.4 transmission. For example, the specific value can be indicated / configured by higher layer or L1 signaling, or it can be the UL maximum transmission power P of the terminal. CMAX preset values, etc.

[0221] In the application of the aforementioned embodiment of the present disclosure, when the indicator of whether to use the Rel-16 DMRS sequence configured by SIB and the indicator of whether to use the Rel-16 DMRS sequence configured by RRC are different from each other, the most recently configured value may be used.

[0222] In the application of the aforementioned embodiments of the present disclosure, the embodiments of the present disclosure may be applied to a terminal that has reported UE capability signaling for a Rel-16 DMRS sequence.

[0223] Fourth embodiment

[0224] According to an embodiment of the present disclosure, a method of selecting one of a Rel-15 PUSCH / PUCCH DMRS sequence and a Rel-16 PUSCH / PUCCH DMRS sequence based on a UL grant format may be provided.

[0225] Fig.13 An example of a method of determining a PUSCH / PUCCH DMRS sequence based on the type of a UL grant DCI format according to an embodiment of the present disclosure is shown.

[0226] refer to Fig.13 , shows a method for selecting a DMRS sequence performed by a terminal based on a UL grant DCI format according to an embodiment of the present disclosure. Fig.13 In operation 1300, the terminal may receive various higher layer configuration information, such as DFT-s-OFDM for UL transmission, pi / 2 BPSK for PUSCH / PUCCH, pi / 2 BPSK for PUSCH / PUCCH DMRS, etc. In order to prevent the base station and the terminal from being confused when selecting a Rel-15 DMRS sequence and selecting a Rel-16 DMRS sequence, in operation 1310, in addition to the methods of the first and second embodiments of the present disclosure, an additional criterion may be determined based on a DCI format type of a UL grant that grants resources to a UL timeslot. For example, according to the above methods of the first and second embodiments of the present disclosure, when the terminal determines to use a Rel-16 DMRS sequence and the UL grant has a DCI format 0_1, the terminal may determine that the higher layer configuration information is valid, and thus the Rel-16 DMRS sequence may be used in operation 1330. On the other hand, when the terminal is granted UL permission through DCI format 0_0, that is, when operating in UL fallback mode, even if the terminal determines to use the Rel-16 DMRS sequence according to the methods of the first and second embodiments of the present disclosure, the terminal can determine that the higher layer configuration information may lose validity, and therefore can use the Rel-15 DMRS sequence in operation 1320.

[0227] In the application of the aforementioned embodiment of the present disclosure, when the indicator of whether to use the Rel-16 DMRS sequence configured by SIB and the indicator of whether to use the Rel-16 DMRS sequence configured by RRC are different from each other, the most recently configured value may be used.

[0228] In the application of the aforementioned embodiments of the present disclosure, the embodiments of the present disclosure may be applied to a terminal that has reported UE capability signaling for a Rel-16 DMRS sequence.

[0229] Fifth embodiment

[0230] According to an embodiment of the present disclosure, a method of selecting one of a Rel-15 PUSCH / PUCCH DMRS sequence and a Rel-16 PUSCH / PUCCH DMRS sequence based on a CORE SET or a SS may be provided.

[0231] Similar to the aforementioned embodiments of the present disclosure, in operation 1300, the terminal may receive various higher layer configuration information, such as DFT-s-OFDM for UL transmission, pi / 2 BPSK for PUSCH / PUCCH, pi / 2 BPSK for PUSCH / PUCCH DMRS, etc. In order to prevent the base station and the terminal from being confused when selecting a Rel-15 DMRS sequence and selecting a Rel-16 DMRS sequence, in addition to the methods of the first and second embodiments of the present disclosure, an additional criterion may be determined based on a CORESET or SS type, which includes a UL grant that grants resources to a UL timeslot. For example, according to the above methods of the first and second embodiments of the present disclosure, when the terminal determines to use a Rel-16 DMRS sequence and the UL grant is not transmitted through CORESET 0 (or a common SS), the terminal may determine that the UL grant is a dedicated UL grant and the higher layer configuration information is valid, and therefore the Rel-16 DMRS sequence may be used. On the other hand, when the terminal is granted a UL grant transmitted through CORESET 0 (or a public SS), the UL grant can be regarded as public information, so that even if the method according to the first and second embodiments of the present disclosure determines that the terminal uses the Rel-16 DMRS sequence, the terminal can also use the Rel-15 DMRS sequence.

[0232] In the application of the aforementioned embodiment of the present disclosure, when the indicator of whether to use the Rel-16 DMRS sequence configured by SIB and the indicator of whether to use the Rel-16 DMRS sequence configured by RRC are different from each other, the most recently configured value may be used.

[0233] In the application of the aforementioned embodiments of the present disclosure, the embodiments of the present disclosure may be applied to a terminal that has reported UE capability signaling for a Rel-16 DMRS sequence.

[0234] Sixth embodiment

[0235] According to an embodiment of the present disclosure, a method of selecting one of a Rel-15 PUSCH / PUCCH DMRS sequence and a Rel-16 PUSCH / PUCCH DMRS sequence based on L1 signaling may be provided.

[0236] In order to improve the flexibility of DMRS sequence selection based on the first to fifth embodiments disclosed above, L1 signaling can be introduced. For example, the base station can notify the Rel-16 terminal (i.e., the terminal has reported that it can generate the Rel-16 DMRS sequence through UE capability signaling) of the possibility of using the Rel-16 DMRS sequence through higher layer signaling, and can indicate whether to use the Rel-16 DMRS sequence through L1 signaling. To this end, the base station can use various methods, such as introducing a new DCI field, performing joint coding with the MCS indication field (for example, using the last code point of the MCS indication field as the Rel-16 DMRS sequence indicator), or performing joint coding with the DMRS port indication field (for example, using the last code point of the DMRS port indication field as the Rel-16 DMRS sequence indicator).

[0237] Fig.14 is a block diagram showing an internal structure of a terminal according to an embodiment of the present disclosure.

[0238] refer to Fig.14 , a terminal for executing the aforementioned embodiments of the present disclosure may include a transceiver 1410, a memory 1420, and a processor 1430. In order for the terminal to execute the method for selecting a UL DMRS sequence according to the first to sixth embodiments of the present disclosure, the processor 1430, the transceiver 1410, and the memory 1420 of the terminal may operate according to the corresponding embodiments of the present disclosure. However, the components of the terminal are not limited to the above examples. For example, the terminal may include more or less components than the above components. In addition, the processor 1430, the transceiver 1410, and the memory 1420 may be implemented in a single chip form. The processor 1430 may also include at least one processor.

[0239] The transceiver 1410 may be collectively referred to as a receiver and a transmitter of a terminal, and sends a signal to a base station and receives a signal from a base station. The signals sent to and received from the base station may include control information and data. To this end, the transceiver 1410 may include a radio frequency (RF) transmitter that up-converts and amplifies the frequency of the transmission signal, and a low-noise amplified received signal and down-converted frequency RF signal. However, this is merely an example of the transceiver 1410, and its components are not limited to RF transmitters and RF receivers.

[0240] The transceiver 1410 may receive a signal through a radio channel and output the received signal to the processor 1430 , and transmit a signal output from the processor 1430 through a radio channel.

[0241] The memory 1420 may store programs and data required for the terminal operation. The memory 1420 may also store control information or data included in the signal obtained by the terminal. The memory 1420 may include a storage medium such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a compact disk (CD)-ROM, a digital versatile disk (DVD), etc. or a combination thereof.

[0242] The processor 1430 may control a series of processes so that the terminal operates according to the above-mentioned embodiments of the present disclosure. For example, the transceiver 1410 may receive a data signal including a control signal, and the processor 1430 may determine the reception result of the data signal. In an embodiment of the present disclosure, the processor 1430 may receive an RS from a base station and interpret an application method of the RS. The processor 1430 may also control the transceiver 1410 to send an RS.

[0243] According to an embodiment of the present disclosure, the processor 1430 may differently control UL DMRS sequence mapping of the terminal based on a UL DMRS sequence selection method. Fig.15 is a block diagram of a structure of a BS according to an embodiment of the present disclosure.

[0244] Fig.15 is a block diagram showing an internal structure of a BS according to an embodiment of the present disclosure.

[0245] refer to Fig.15 , the base station may include a transceiver 1510, a memory 1520, and a processor 1530. The processor 1530, the transceiver 1510, and the memory 1520 of the base station may operate according to the above-mentioned communication method of the base station. However, the components of the base station are not limited to the above-mentioned examples. For example, the base station may include more or less than the above-mentioned components. In addition, the processor 1530, the transceiver 1510, and the memory 1520 may be implemented in a single chip form. The processor 1530 may also include at least one processor.

[0246] The transceiver 1510 may be collectively referred to as a receiver and a transmitter of a base station, and transmits a signal to a terminal and receives a signal from a terminal. The signals transmitted by the base station to the terminal and received from the terminal may include control information and data. The transceiver 1510 may include an RF transmitter that up-converts and amplifies the frequency of the transmission signal, and a low-noise amplified reception signal and a down-converted frequency RF signal. However, this is merely an example of the transceiver 1510, and its components are not limited to the RF transmitter and the RF receiver. The transceiver 1510 may receive a signal through a radio channel and output the received signal to the processor 1530, and transmit a signal output from the processor 1530 through a radio channel.

[0247] The memory 1520 may store programs and data required for the base station to operate. The memory 1520 may also store control information or data included in a signal obtained by the base station. The memory 1520 may include a storage medium such as ROM, RAM, hard disk, CD-ROM, DVD, etc. or a combination thereof.

[0248] The processor 1530 may control a series of processes so that the base station operates according to the above-described embodiments of the present disclosure. For example, the transceiver 1510 may receive a data signal including a control signal sent from a terminal, and the processor 1530 may determine a reception result of the control signal and the data signal sent from the terminal. In an embodiment of the present disclosure, the processor 1530 may determine a structure of an RS, generate configuration information of an RS to be transmitted to a terminal, generate a CSI-RS or DMRS sequence based on the configuration information, and transmit the CSI-RS or DMRS to the terminal.

[0249] In addition, according to an embodiment of the present disclosure, the processor 1530 may determine selection and mapping of a UL DMRS sequence based on a preset condition, and thus control each component of the base station to receive a DMRS and a PUSCH or a PUCCH.

[0250] The method according to the embodiments of the present disclosure described in the claims or specification of the present disclosure may be implemented by hardware, software or a combination thereof.

[0251] When the method is implemented by software, a computer-readable storage medium having one or more programs (software modules) stored therein may be provided. One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors in an electronic device. One or more programs include instructions that cause the electronic device to perform the method according to the embodiments of the present disclosure described in the claims or specification of the present disclosure.

[0252] These programs (software modules and software) can be stored in RAM, non-volatile memory including flash memory, ROM, EEPROM, magnetic disk storage, CD-ROM, DVD, other types of optical storage or cassette tape. The program can be stored in a memory configured by a combination of some or all of such storage devices. In addition, each of the memories can be set to multiple.

[0253] The program can be stored in an attachable storage device of the electronic device, which can be accessed via a communication network such as the Internet, an intranet, a local area network (LAN), a wireless local area network (WLAN), or a storage area network (SAN), or a communication network through a combination of networks. The storage device can access the device executing the embodiments of the present disclosure through an external port. In addition, an independent storage device in the communication network can access the device executing the embodiments of the present disclosure.

[0254] In the detailed embodiments of the present disclosure, according to the detailed embodiments provided by the present disclosure, the components included in the present disclosure are expressed as singular or plural. However, the conditions provided for the convenience of description appropriately select singular or plural expressions, and the present disclosure is not limited to singular or plural components, and the components expressed as plural can be configured as a single component, or the components expressed as singular can also be configured as plural components.

[0255] While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: identifying that transform precoding is enabled based on first information received from a base station; identifying whether to enable pi / 2 binary phase shift keying BPSK modulation with transform precoding based on second information received from the base station; identifying whether to use the first demodulation reference signal DMRS for a physical uplink shared channel PUSCH with pi / 2 BPSK modulation based on the second information and the third information received from the base station; as well as sending a first DMRS for a PUSCH to a base station using a first sequence generated based on the first information, the second information, and the third information, wherein the first sequence is generated when transform precoding is enabled, pi / 2 BPSK modulation is used for PUSCH, and the first DMRS is used for PUSCH with pi / 2 BPSK modulation, and Wherein, when transform precoding is disabled, a second sequence different from the first sequence is used for DMRS transmission of the PUSCH.

2. The method of claim 1, wherein: In case transform precoding is enabled and pi / 2 BPSK modulation is used for a physical uplink control channel PUCCH, the first sequence is used for a second DMRS associated with the PUCCH.

3. The method of claim 2, wherein: In case that pi / 2 BPSK modulation is not used for PUSCH, or the first DMRS is not used for PUSCH with pi / 2 BPSK modulation, the second sequence is used for DMRS transmission of PUSCH, and Wherein, when transform precoding is disabled or pi / 2 BPSK modulation is not used for PUCCH, the second sequence is used for the second DMRS associated with PUCCH.

4. The method of claim 3, wherein the first sequence is associated with a lower peak-to-average power ratio (PAPR) than the second sequence. 5 . The method of claim 1 , wherein the first information, the second information, and the third information are received via at least one radio resource control (RRC) message.

6. A terminal in a wireless communication system, the terminal comprising: Transceiver; as well as at least one processor coupled to the transceiver, wherein the at least one processor is configured to: identifying that transform precoding is enabled based on first information received from a base station, identifying whether to enable pi / 2 binary phase shift keying BPSK modulation with transform precoding based on second information received from the base station, identifying whether to use the first demodulation reference signal DMRS for a physical uplink shared channel PUSCH having pi / 2 BPSK modulation based on the second information and the third information received from the base station, and sending a first DMRS for a PUSCH to a base station using a first sequence generated based on the first information, the second information, and the third information, wherein the first sequence is generated when transform precoding is enabled, pi / 2 BPSK modulation is used for PUSCH, and the first DMRS is used for PUSCH with pi / 2 BPSK modulation, Wherein, when transform precoding is disabled, a second sequence different from the first sequence is used for DMRS transmission of the PUSCH.

7. The terminal according to claim 6, wherein: In case transform precoding is enabled and pi / 2 BPSK modulation is used for a physical uplink control channel PUCCH, the first sequence is used for a second DMRS associated with the PUCCH.

8. The terminal according to claim 7, wherein: In case that pi / 2 BPSK modulation is not used for PUSCH or the first DMRS is not used for PUSCH with pi / 2 BPSK modulation, the second sequence is used for DMRS transmission of PUSCH, and Wherein, when transform precoding is disabled or pi / 2 BPSK modulation is not used for PUCCH, the second sequence is used for the second DMRS associated with PUCCH.

9. The terminal of claim 8, wherein the first sequence is associated with a lower peak-to-average power ratio (PAPR) than the second sequence. 10 . The terminal of claim 6 , wherein the first information, the second information, and the third information are received via at least one radio resource control (RRC) message.

11. A method performed by a base station in a wireless communication system, the method comprising: Sending first information to a terminal, the first information indicating that transform precoding is enabled; Sending second information to the terminal, the second information indicating whether to enable pi / 2 binary phase shift keying BPSK modulation with transform precoding; Sending third information to the terminal, where the third information indicates whether to use the first demodulation reference signal DMRS for a physical uplink shared channel PUSCH with pi / 2 BPSK modulation; as well as receiving a first DMRS for a PUSCH using a first sequence generated based on the first information, the second information, and the third information, wherein the first sequence is generated when transform precoding is enabled, pi / 2 BPSK modulation is used for PUSCH, and the first DMRS is used for PUSCH with pi / 2 BPSK modulation, and Wherein, when transform precoding is disabled, a second sequence different from the first sequence is used for DMRS reception of PUSCH.

12. The method of claim 11, wherein in a case where transform precoding is enabled and pi / 2 BPSK modulation is used for a physical uplink control channel (PUCCH), the first sequence is used for a second DMRS associated with the PUCCH.

13. The method of claim 12, wherein: In case that pi / 2 BPSK modulation is not used for PUSCH or the first DMRS is not used for PUSCH with pi / 2 BPSK modulation, the second sequence is used for DMRS reception of PUSCH, and Wherein, when transform precoding is disabled or pi / 2 BPSK modulation is not used for PUCCH, the second sequence is used for the second DMRS associated with PUCCH.

14. The method of claim 13, wherein the first sequence is associated with a lower peak-to-average power ratio (PAPR) than the second sequence.

15. The method of claim 11, wherein the first information, the second information, and the third information are transmitted via at least one radio resource control (RRC) message.

16. A base station in a wireless communication system, the base station comprising: Transceiver; as well as at least one processor coupled to the transceiver, wherein the at least one processor is configured to: sending first information to a terminal, the first information indicating that transform precoding is enabled, sending second information to the terminal, the second information indicating whether to enable pi / 2 binary phase shift keying BPSK modulation with transform precoding, sending third information to the terminal, the third information indicating whether to use the first demodulation reference signal DMRS for a physical uplink shared channel PUSCH with pi / 2 BPSK modulation, and receiving a first DMRS for a PUSCH using a first sequence generated based on the first information, the second information, and the third information, wherein the first sequence is generated when transform precoding is enabled, pi / 2 BPSK modulation is used for PUSCH, and the first DMRS is used for PUSCH with pi / 2 BPSK modulation, and Wherein, when transform precoding is disabled, a second sequence different from the first sequence is used for DMRS reception of PUSCH.

17. The base station of claim 16, wherein in a case where transform precoding is enabled and pi / 2 BPSK modulation is used for a physical uplink control channel (PUCCH), the first sequence is used for a second DMRS associated with the PUCCH.

18. The base station according to claim 17, wherein: In case that pi / 2 BPSK modulation is not used for PUSCH or the first DMRS is not used for PUSCH with pi / 2 BPSK modulation, the second sequence is used for DMRS reception of PUSCH, and Wherein, when transform precoding is disabled or pi / 2 BPSK modulation is not used for PUCCH, the second sequence is used for the second DMRS associated with PUCCH.

19. The base station of claim 18, wherein the first sequence is associated with a lower peak-to-average power ratio (PAPR) than the second sequence.

20. The base station of claim 16, wherein the first information, the second information, and the third information are transmitted via at least one radio resource control (RRC) message.

Images