Method for receiving long PUCCH, base station and computer readable medium

Abstract

Method for receiving long PUCCH, base station and computer-readable medium. The present specification provides a method for receiving long PUCCH based on multiple time slots in a wireless communication system. More specifically, a method performed by a terminal includes the following steps: receiving first information about TDD UL‑DL time slot configuration from a base station; receiving second information from the base station, the second information including a first parameter indicating the number of time slots used for long PUCCH transmission and a second parameter indicating the duration of a PUCCH symbol within the PUCCH time slot; determining a time slot for sending a long PUCCH based on multiple time slots based on the first information and the second information; and sending a long PUCCH based on multiple time slots to the base station on the determined time slot.

Description

[0001] This application is a divisional application of the invention patent application with the original application number 201880071350.3 (International application number: PCT / KR2018 / 013330, application date: November 5, 2018, invention name: Method and device for sending long PUCCH based on multiple time slots). Technical Field

[0002] The present specification relates to a wireless communication system, and more particularly, to a method of transmitting and receiving a long Physical Uplink Control Channel (PUCCH) using a plurality of time slots and a device supporting the method. Background Art

[0003] Mobile communication systems have been developed to provide voice services while ensuring user mobility. However, in mobile communication systems, not only voice services but also data services have been expanded. Currently, due to the explosive growth of traffic, there is a shortage of resources and users need higher-speed services, resulting in the need for more developed mobile communication systems.

[0004] The requirements for the next generation of mobile communication systems should be able to support: the accommodation of explosive data services, a significant increase in the data rate per user, the accommodation of a significantly increased number of connected devices, very low end-to-end latency, and high energy efficiency. To this end, various technologies including dual connectivity, massive multiple-input multiple-output (MIMO), in-band full-duplex, non-orthogonal multiple access (NOMA), ultra-wideband support, and device interconnection have been studied. Summary of the invention

[0005] Technical issues

[0006] The present specification provides a method for configuring a multi-slot long PUCCH for repeatedly transmitting a long PUCCH for coverage extension based on a parameter set, a slot format indicator, etc.

[0007] The technical objectives of the present invention are not limited to the above-mentioned technical objectives, and other technical objectives not mentioned above will become apparent to those skilled in the art from the following description.

[0008] Technical Solution

[0009] The present specification provides a method for transmitting a long Physical Uplink Control Channel (PUCCH) using a plurality of time slots in a wireless communication system.

[0010] More specifically, the method performed by the user equipment includes the following steps: receiving first information about time division duplex (TDD) uplink (UL)-downlink (DL) time slot configuration from a base station; receiving second information from the base station, the second information including a first parameter indicating the number of time slots used for long PUCCH transmission and a second parameter indicating the duration of a PUCCH symbol within the PUCCH time slot; determining a plurality of time slots for sending the long PUCCH based on the first information and the second information; and sending the long PUCCH to the base station on the plurality of time slots.

[0011] Furthermore, in the present specification, a plurality of slots determined for transmitting the long PUCCH is a specific number of slots from the configured start slot.

[0012] Furthermore, in this specification, a specific number of slots are composed of UL slots or unknown slots.

[0013] In addition, in the present specification, the number of UL symbols available for transmission of the long PUCCH within the UL slot is greater than or equal to the second parameter.

[0014] Furthermore, in the present specification, when the number of UL symbols available for transmission of the long PUCCH in a specific time slot among the determined time slots is less than the second parameter, the long PUCCH is not transmitted in the specific time slot.

[0015] Furthermore, in the present specification, the method further includes receiving a slot format indicator (SFI) for providing notification of a specific TDD UL-DL slot format from the base station.

[0016] In addition, in the present specification, a long PUCCH is transmitted using a pre-discrete Fourier transform (DFT) orthogonal cover code (OCC).

[0017] In addition, in the present specification, a long PUCCH resource is determined by pairing an OCC related to an uplink control information (UCI) part and a cyclic shift (CS) related to a reference signal.

[0018] In addition, in the present specification, a user equipment for sending a long physical uplink control channel (PUCCH) using multiple time slots in a wireless communication system includes: a radio frequency (RF) module, the RF module is used to send and receive radio signals; and a processor, which is functionally connected to the RF module, wherein the processor is configured to: receive first information about a time division duplex (TDD) uplink (UL)-downlink (DL) time slot configuration from a base station; receive second information from the base station, the second information including a first parameter indicating the number of time slots used for long PUCCH transmission and a second parameter indicating the duration of a PUCCH symbol within the PUCCH time slot; determine multiple time slots for sending the long PUCCH based on the first information and the second information; and send the long PUCCH to the base station on multiple time slots.

[0019] Furthermore, in the present specification, the processor is configured to not transmit the long PUCCH on a specific time slot when the number of UL symbols available for transmission of the long PUCCH in a specific time slot among the determined time slots is less than that in a second time slot.

[0020] Furthermore, in the present specification, the processor is configured to receive a slot format indicator SFI for providing notification of a specific TDD UL-DL slot format from the base station.

[0021] Beneficial Effects

[0022] The effect of the present specification is that it can extend the coverage by transmitting PUCCH using multiple time slots in the dynamic TDD case.

[0023] Furthermore, the present specification has the effect that it can support multiple users and a large UCI payload by transmitting a PUCCH based on a pre-DFT OCC.

[0024] It is obvious to those skilled in the art that the present invention can be implemented in other specific forms without departing from the essential characteristics of the present invention. Therefore, the detailed description mentioned above should not be interpreted as being restrictive in all aspects, and should be considered as exemplary. The scope of the present invention should be determined by a reasonable interpretation of the attached claims, and all modifications within the equivalent scope of the present invention are included within the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to help understand the present invention, the accompanying drawings are included and constitute a part of the detailed description. The accompanying drawings provide embodiments of the present invention and together with the detailed description describe the technical features of the present invention.

[0026] Figure 1 A diagram showing an example of an overall system structure of a NR to which the method proposed in this specification can be applied.

[0027] Figure 2 The relationship between uplink frames and downlink frames in a wireless communication system to which the method proposed in this specification can be applied is shown.

[0028] Figure 3 An example of a resource grid supported in a wireless communication system to which the method proposed in this specification can be applied is shown.

[0029] Figure 4 An example of a self-contained subframe structure to which the method proposed in this specification can be applied is shown.

[0030] Figure 5 is a flowchart showing an example of an operation method of a UE transmitting a long PUCCH using multiple time slots proposed in this specification.

[0031] Figure 6 is a flowchart showing an example of an operation method of a base station receiving a long PUCCH using a plurality of time slots proposed in this specification.

[0032] Figure 7 A block diagram of a wireless communication device to which the method proposed in this specification can be applied is shown.

[0033] Figure 8 A block diagram of a communication device according to an embodiment of this document is shown.

[0034] Fig. 9 An example of an RF module of a wireless communication device to which the method proposed in this specification can be applied is shown.

[0035] Fig.10 Another example of an RF module of a wireless communication device to which the method proposed in this specification can be applied is shown. DETAILED DESCRIPTION

[0036] Some embodiments of the present disclosure are described in detail with reference to the accompanying drawings. Figure 1 The detailed description disclosed above is intended to describe some exemplary embodiments of the present disclosure, and is not intended to describe the only embodiment of the present disclosure. The following detailed description includes more details in order to provide a complete understanding of the present disclosure. However, it will be understood by those skilled in the art that the present disclosure can be implemented without these more details.

[0037] In some cases, in order to avoid obscuring the concept of the present disclosure, known structures and devices are omitted, or known structures and devices may be shown in the form of block diagrams based on core functions of each structure and device.

[0038] In the present disclosure, a base station has the meaning of an end node of a network, through which the base station communicates directly with a terminal. In this document, a specific operation described as being performed by a base station may be performed by an upper node of the base station according to the circumstances. That is, it is obvious that in a network including a plurality of network nodes including a base station, various operations performed for communicating with a terminal may be performed by a base station or other network nodes other than the base station. A base station (BS) may be replaced by another term such as a fixed station, a node B, an evolved node B (eNB), a base transceiver system (BTS), or an access point (AP). In addition, a terminal may be fixed or may have mobility and may be replaced by another term such as a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), a wireless terminal (WT), a machine type communication (MTC) device, a machine to machine (M2M) device, or a device to device (D2D) device.

[0039] In the following, downlink (DL) refers to communication from a base station to a UE, and uplink (UL) refers to communication from a UE to a base station. In DL, a transmitter may be part of a base station, and a receiver may be part of a UE. In UL, a transmitter may be part of a UE, and a receiver may be part of a base station.

[0040] Specific terms used in the following description have been provided to help understanding of the present disclosure, and the use of these specific terms may be changed in various forms without departing from the technical spirit of the present disclosure.

[0041] The following technologies may be used for various wireless communication systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and non-orthogonal multiple access (NOMA). CDMA may be implemented using radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented using radio technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented using radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, or Evolved UTRA (E-UTRA). UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using Evolved UMTS Terrestrial Radio Access (E-UTRA) and it employs OFDMA in downlink and SC-FDMA in uplink. LTE-Advanced (LTE-A) is an evolution of 3GPP LTE.

[0042] In addition, 5G New Radio (NR) defines enhanced mobile broadband (eMBB), massive machine type communications (mMTC), ultra-reliability and low latency communications (URLLC), and vehicle-to-everything (V2X) based on usage scenarios.

[0043] And, the 5G NR standard is divided into standalone (SA) and non-standalone (NSA) according to the coexistence between the NR system and the LTE system.

[0044] In addition, 5G NR supports various subcarrier spacings and supports CP-OFDM in the downlink, and CP-OFDM and DFT-s-OFDM (SC-OFDM) in the uplink.

[0045] The embodiments of the present disclosure may be supported by standard documents disclosed in at least one of IEEE 802, 3GPP, and 3GPP2, i.e., a radio access system. That is, steps or parts that belong to the embodiments of the present disclosure and are not described in order to clearly reveal the technical spirit of the present disclosure may be supported by these documents. In addition, all terms disclosed in this document may be described by standard documents.

[0046] For clearer description, 3GPP LTE / LTE-A is mainly described, but the technical features of the present disclosure are not limited thereto.

[0047] Definition of terms

[0048] eLTE eNB: eLTE eNB is the evolution of eNB that supports the connection of EPC and NGC.

[0049] gNB: A node that supports NR in addition to connectivity to NGC.

[0050] New RAN: A radio access network that supports NR or E-UTRA or interacts with NGC.

[0051] Network slicing: Network slicing is a network defined by operators to provide solutions optimized for specific market scenarios with specific requirements and range between terminals.

[0052] Network Function: A network function is a logical node in the network architecture with a well-defined external interface and well-defined functional operations.

[0053] NG-C: The control plane interface used by the NG2 reference point between the New RAN and NGC.

[0054] NG-U: User plane interface used by the NG3 reference point between New RAN and NGC.

[0055] Non-standalone NR: A deployment configuration where the gNB requires an LTE eNB as an anchor point for the control plane connection to the EPC or an eLTE eNB as an anchor point for the control plane connection to the NGC.

[0056] Non-Standalone E-UTRA: eLTE eNB requires a deployment configuration where the gNB acts as an anchor point for the control plane connection to the NGC.

[0057] User Plane Gateway: The endpoint of the NG-U interface.

[0058] General System

[0059] Figure 1 is a diagram illustrating an example of an overall structure of a New Radio (NR) system in which the method proposed in the present disclosure can be implemented.

[0060] Reference Figure 1 , NG-RAN consists of gNBs that provide the NG-RA user plane (new AS sublayer / PDCP / RLC / MAC / PHY) and the control plane (RRC) protocol terminals for UE (user equipment).

[0061] The gNBs are connected to each other via the Xn interface.

[0062] The gNB is also connected to the NGC via the NG interface.

[0063] More specifically, the gNB is connected to the Access and Mobility Management Function (AMF) via the N2 interface and to the User Plane Function (UPF) via the N3 interface.

[0064] New Rat (NR) parameter set and frame structure

[0065] In NR systems, multiple parameter sets can be supported. The parameter set can be defined by subcarrier spacing and CP (cyclic prefix) overhead. The spacing between multiple subcarriers can be derived by scaling the basic subcarrier spacing to an integer N (or μ). In addition, although it is assumed that very low subcarrier spacing is not used for very high subcarrier frequencies, the parameter set to be used can be selected independently of the frequency band.

[0066] In addition, in the NR system, various frame structures according to multiple parameter sets can be supported.

[0067] Hereinafter, an Orthogonal Frequency Division Multiplexing (OFDM) parameter set and a frame structure that can be considered in the NR system will be described.

[0068] Multiple OFDM parameter sets supported in the NR system can be defined as shown in Table 1.

[0069] [Table 1]

[0070] μ <![CDATA[Δf=2 μ ·15[kHz]]]> Cyclic Prefix (CP) 0 15 normal 1 30 normal 2 60 Normal, Extended 3 120 normal 4 240 normal

[0071] Regarding the frame structure in the NR system, the size of various fields in the time domain is denoted as T s =1 / (Δf max ·N f ). In this case, Δf max =480.10 3 And N f =4096. DL and UL transmissions are configured with T f =(Δf max N f / 100).T s =10ms segment of the radio frame. The radio frame consists of ten subframes, each with T sf =(Δf max N f / 1000)·T s =1 ms segment. In this case, there may be a set of UL frames and a set of DL frames.

[0072] Figure 2 The relationship between the UL frame and the DL frame in the wireless communication system in which the method proposed in the present disclosure can be implemented is shown.

[0073] like Figure 2As shown in FIG, the UL frame numbered i from the user equipment (UE) needs to start T before the corresponding DL frame in the UE. TA =N TA T s is sent.

[0074] With respect to parameter set μ, the time slots are numbered in ascending order in the subframe as In the radio frame, the numbers are in ascending order. A time slot consists of Consecutive OFDM symbols, and It is determined by the parameter set and time slot configuration used. The time slot in a subframe The start of the OFDM symbol in the same subframe is in time Start alignment.

[0075] Not all UEs are capable of transmitting and receiving simultaneously, which means that not all OFDM symbols in a DL slot or a UL slot are available for use.

[0076] Table 2 shows the number of OFDM symbols per slot for the normal CP in the parameter set μ, and Table 3 shows the number of OFDM symbols per slot for the extended CP in the parameter set μ.

[0077] [Table 2]

[0078]

[0079] [Table 3]

[0080]

[0081] NR Physics Resources

[0082] Regarding the physical resources in the NR system, we can consider antenna ports, resource grids, resource elements, resource blocks, carrier parts, etc.

[0083] In the following, the above-mentioned physical resources that can be considered in the NR system will be described in more detail.

[0084] First, with respect to antenna ports, the antenna ports are defined so that the channel through which the symbol on one antenna port is transmitted can be inferred from another channel through which the symbol on the same antenna port is transmitted. When the large-scale properties of the channel through which the symbol on one antenna port is received can be inferred from the channel through which the symbol on another antenna port is transmitted, the two antenna ports can be in a QC / QCL (quasi-co-located or quasi-co-located) relationship. Here, the large-scale properties may include at least one of delay spread, Doppler spread, Doppler shift, average gain, and average delay.

[0085] Figure 3 An example of a resource grid supported in a wireless communication system in which the method proposed in the present disclosure can be implemented is shown.

[0086] Reference Figure 3 , the resource grid is represented in the frequency domain by subcarriers, each subframe consists of 14·2 μ OFDM symbols, but the present disclosure is not limited thereto.

[0087] In the NR system, the transmitted signal is described by one or more resource grids. subcarriers and OFDM symbols, where above Indicates the maximum transmission bandwidth, and it can change not only between parameter sets but also between UL and DL.

[0088] In this case, if Figure 3 As shown, a resource grid can be configured for parameter set μ and antenna port p.

[0089] Each element of the resource grid for a parameter set μ and antenna port p is denoted as a resource element and can be represented by an index pair Uniquely identifies. Here, is the index in the frequency domain, and Indicates the position of the symbol in the subframe. To indicate the resource element in a time slot, an index pair (k, l) is used. Here,

[0090] Resource elements for numerology set μ and antenna port p Corresponds to complex value When there is no risk of confusion or when specifying a specific antenna port or parameter set, the indices p and μ can be dropped so that the complex value becomes or

[0091] In addition, the physical resource blocks are defined in the frequency domain as In the frequency domain, physical resource blocks can be from 0 to At this time, the physical resource block number n can be given as formula 1 PRB and the relationship between resource elements (k,l).

[0092] [Formula 1]

[0093]

[0094] In addition, with respect to carrier portions, the UE may be configured to use only a subset of the resource grid to receive or transmit a carrier portion. In this case, the set of resource blocks that the UE is configured to receive or transmit is from 0 to serial number.

[0095] Self-contained subframe structure

[0096] The time division duplex (TDD) structure considered in the NR system is a structure in which both uplink (UL) and downlink (DL) are processed in a single subframe. This is to minimize the delay of data transmission in the TDD system, and this structure is called a self-contained subframe structure.

[0097] Figure 4 An example of a self-contained subframe structure to which the method proposed in this specification can be applied is shown. Figure 4 It is only for the convenience of description and is not intended to limit the scope of the present invention.

[0098] Reference Figure 4 In the case of conventional LTE, it is assumed that one subframe includes 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols.

[0099] exist Figure 4 In the figure, region 402 means a downlink control region, and region 404 means an uplink control region. In addition, regions other than region 402 and region 404 (ie, regions not separately indicated) may be used for transmission of downlink data or transmission of uplink data.

[0100] That is, uplink control information and downlink control information are transmitted in one self-contained subframe. In contrast, in the case of data, uplink data or downlink data is transmitted in one self-contained subframe.

[0101] If you use Figure 4 According to the structure shown in FIG. 1 , downlink transmission and uplink transmission are sequentially performed in one self-contained subframe. Downlink data transmission and uplink ACK / NACK reception can be performed.

[0102] As a result, when a data transmission error occurs, the time taken to resend the data can be reduced. Therefore, the delay associated with data transmission can be minimized.

[0103] In such Figure 4In such a self-contained subframe structure, a time gap is necessary for a base station (eNodeB, eNB, gNB) and / or a terminal (user equipment (UE)) to switch from a transmission mode to a reception mode or a base station and / or a terminal to switch from a reception mode to a transmission mode. With respect to this time gap, if uplink transmission is performed in a self-contained subframe after downlink transmission, some OFDM symbols may be configured as a guard period (GP).

[0104] Carrier Aggregation

[0105] The communication environment considered in the embodiments of the present invention includes all multi-carrier support environments. That is, the multi-carrier system or carrier aggregation (CA) system used in the present invention refers to a system in which one or more component carriers (CCs) with a bandwidth smaller than the target bandwidth are aggregated and used to support broadband when configuring the target broadband.

[0106] In the present invention, multi-carrier refers to aggregation of carriers (or carrier aggregation), and in this case, aggregation of carriers refers to both aggregation of continuous carriers and aggregation of non-continuous carriers. In addition, the number of component carriers aggregated between the downlink and the uplink may be set differently. The case where the number of downlink component carriers (hereinafter referred to as "DL CCs") is equal to the number of uplink component carriers (hereinafter referred to as "UL CCs") is called symmetric aggregation, and the case where the number of downlink CCs is different from the number of uplink CCs is called asymmetric aggregation. Such carrier aggregation may be used interchangeably with terms such as carrier aggregation, bandwidth aggregation, spectrum aggregation, and the like.

[0107] The purpose of carrier aggregation configured by combining two or more component carriers is to support bandwidths of up to 100 MHz in LTE-A systems. When combining one or more carriers with bandwidths smaller than the target bandwidth, the bandwidth of the combined carriers can be limited to the bandwidth used in the existing system in order to maintain backward compatibility with the existing IMT system. For example, in the existing 3GPP LTE system, bandwidths of {1.4, 3, 5, 10, 15, 20} MHz are supported, and in the 3GPP LTE Advanced (i.e., LTE-A) system, bandwidths greater than 20 MHz can be supported by using only bandwidths compatible with the existing system. In addition, the carrier aggregation system used in the present invention can support carrier aggregation by defining a new bandwidth, regardless of the bandwidth used in the existing system.

[0108] The LTE-A system uses the concept of cells to manage radio resources.

[0109] The carrier aggregation environment mentioned above may be referred to as a multi-cell environment. A cell is defined as a combination of a pair of downlink resources (DL CC) and uplink resources (UL CC), but uplink resources are not required. Therefore, a cell may be composed of downlink resources alone or of downlink resources and uplink resources. When a specific user equipment has only one configured serving cell, the specific user equipment may have one DL CC and one UL CC, but when a specific user equipment has two or more configured serving cells, the specific user equipment may have as many DL CCs as cells, and the number of UL CCs may be equal to or less than the number of DL CCs.

[0110] Alternatively, the DL CC and UL CC may be configured oppositely. That is, when a specific user equipment has multiple configured serving cells, a carrier aggregation environment in which the number of UL CCs is greater than the number of DL CCs may also be supported. That is, carrier aggregation may be understood as the aggregation of two or more different cells having carrier frequencies (center frequencies of the cells), respectively. Here, the term "cell" needs to be distinguished from the commonly used "cell" as the area covered by a base station.

[0111] The cells used in the LTE-A system include a primary cell (PCell) and a secondary cell (SCell). The PCell and the SCell can be used as serving cells. When the user equipment is in the RRC_CONNECTED state but carrier aggregation is not configured or carrier aggregation is not supported, there is only one serving cell configured only by the PCell. On the contrary, when the user equipment is in the RRC_CONNECTED state and carrier aggregation is configured, there may be one or more serving cells, and the complete serving cell includes the PCell and one or more SCells.

[0112] The serving cell (PCell and SCell) can be configured by RRC parameters. PhysCellId uses integer values ​​0 to 503 as the physical layer identifier of the cell. SCellIndex uses integer values ​​1 to 7 as a short identifier for identifying the SCell. ServCellIndex uses integer values ​​0 to 7 as a short identifier for identifying the serving cell (PCell or SCell). The value 0 is applied to the PCell, and ScellIndex is pre-approved to be applied to the SCell. That is, the cell with the smallest cell ID (or cell index) in ServCellIndex becomes the PCell.

[0113] A P cell refers to a cell (or a primary CC) operating in a primary frequency. A user terminal may be used to perform an initial connection establishment process or a connection reestablishment process, and may refer to a cell indicated during a handover process. In addition, a P cell refers to a cell that becomes the center of control-related communications among service cells configured in a carrier aggregation environment. That is, a PUCCH may be allocated to a user equipment only in the P cell of the user equipment, and the allocated PUCCH may be sent, and only the P cell may be used to obtain system information or change the monitoring process. An Evolved Universal Terrestrial Radio Access (E-UTRAN) may change only the P cell used for a handover process by using a higher-layer RRC connection reconfiguration message that includes mobility control information about a user equipment supporting a carrier aggregation environment.

[0114] An S cell refers to a cell (or secondary CC) operating at a second frequency. Only one P cell may be allocated to a specific user equipment, and one or more S cells may be allocated to a specific user equipment. The S cell may be configured after the RRC connection is configured, and may be used to provide additional radio resources. There is no PUCCH in the remaining cells (i.e., S cells) except the P cells among the service cells configured in the carrier aggregation environment. When the E-UTRAN adds an S cell in a user equipment supporting a carrier aggregation environment, the E-UTRAN may provide all system information related to the operation of the relevant cell in the RRC_CONNECTED state through a dedicated signal. The change of system information may be controlled by releasing and adding the relevant S cells, and at this time, a higher-layer RRC connection reconfiguration message may be used. The E-UTRAN may perform dedicated signaling with different parameters for each user equipment instead of broadcasting within the relevant S cell.

[0115] After the initial security activation process starts, the E-UTRAN may configure a network including one or more SCells in addition to the PCell initially configured in the connection establishment process. In a carrier aggregation environment, the PCell and the SCell may operate as respective component carriers. In the following embodiments, the primary component carrier (PCC) may be used in the same meaning as the PCell, and the secondary component carrier (SCC) may be used in the same meaning as the SCell.

[0116] The NR system may support a physical uplink control channel (PUCCH), i.e., a physical channel for transmitting uplink control information (UCI) including information such as HARQ-ACK, scheduling request (SR), channel state information (CSI), and the like.

[0117] In this case, according to UCI payload, PUCCH can be divided into small PUCCH supporting small UCI payload (e.g., 1-2 bits UCI) and large PUCCH supporting large UCI payload (e.g., more than 2 bits and up to hundreds of bits).

[0118] In addition, each of the small PUCCH and the large PUCCH may be divided into a short PUCCH having a short duration (eg, 1-2 symbol duration) and a long PUCCH having a long duration (eg, 4-14 symbol duration).

[0119] Table 4 shows an example of the PUCCH format.

[0120] [Table 4]

[0121]

[0122] In Table 4, Indicates the length of the PUCCH transmission in an OFDM symbol. PUCCH formats 1, 3, and 4 may be denoted as long PUCCH, and PUCCH formats 0 and 2 may be denoted as short PUCCH.

[0123] The symbol “ / ” used in the present specification may be interpreted as having the same meaning as “and / or.” “A and / or B” may be interpreted as having the same meaning as “including at least one of A or B.”

[0124] Furthermore, the long PUCCH may be basically used to transmit medium / large UCI payloads or to improve the coverage of small UCI payloads.

[0125] Furthermore, if coverage must be additionally expanded compared to the long PUCCH, a multi-slot long PUCCH in which the same UCI information is transmitted in a plurality of slots can be supported.

[0126] In this case, the operation of transmitting the long PUCCH using a plurality of slots may include an operation of repeatedly transmitting the long PUCCH in a plurality of slots.

[0127] For example, if coverage cannot be ensured at a given UCI payload and code rate, it may be necessary to ensure coverage through gain based on repeated transmission using multi-slot long PUCCH.

[0128] Except for special cases such as MBMS or NB-IoT, the LTE system only supports a subcarrier spacing of 15 kHz, while the NR system supports various parameter sets such as 15 kHz, 30 kHz, 60 kHz, 120 kHz and 240 kHz by considering various use cases and deployment scenarios as described above.

[0129] In this case, the parameter set refers to the subcarrier spacing and the cyclic prefix (CP).

[0130] In NR, if large subcarriers are used (e.g., subcarrier spacing of 30 kHz or greater), although a long PUCCH utilizing all 14 symbols in a slot is used due to the shortened slot duration, reduced coverage compared to LTE PUCCH is inevitable due to physical factors.

[0131] Therefore, in this case, it may be necessary to use multi-slot long PUCCH to improve coverage.

[0132] In addition, although the same 15kHz subcarrier spacing as LTE is used, it may be necessary to use multi-slot long PUCCH in order to support the same deployment scenarios as LTE by ensuring coverage of the repetition level of HARQ-ACK in LTE.

[0133] Hereinafter, this specification proposes a method for setting and operating the number of slots of a multi-slot long PUCCH by considering various parameter sets in NR and the corresponding coverage impact.

[0134] Method for setting the number of time slots in multi-slot length PUCCH

[0135] The NR system can configure and select multiple slot lengths across multi-slot long PUCCH for each UE by considering that the path loss is different according to the UE location when using multi-slot long PUCCH for the above reasons.

[0136] For example, if the number of multi-slot long PUCCH slots is set to 4 and is selected, the number of slots of the multi-slot long PUCCH may have a form such as X={x0, x1, x2, x3}.

[0137] In this case, the number of time slots may have the relationship of x0<=x1<=x2<=x3. Non-multi-slot or single-slot length PUCCH may be selected by setting x0=1.

[0138] In this case, the maximum value of the number of multi-slot long PUCCH slots X (eg, x3) may be set to satisfy the maximum coverage / link budget / MCL required by the smallest cell.

[0139] Furthermore, the intermediate values ​​(eg, x1, x2) may be set to values ​​smaller than the maximum value (eg, x3) so that the minimum number of time slots required in a given situation is allocated.

[0140] In addition, the number of multi-slot long PUCCH slots may be configured by UE-specific RRC, or may be configured by dynamic indication using DCI.

[0141] In addition, a method in which UE-specific RRC configures multiple (eg, 4) multi-slot long PUCCH slot lengths and dynamically indicates them through DCI may be considered.

[0142] In this case, in addition to the number of time slots in the multi-slot long PUCCH, the PUCCH coverage is also related to the long PUCCH duration, subcarrier spacing, etc.

[0143] Therefore, in order to determine the value of the number of slots in a multi-slot long PUCCH supporting various types of coverage as described above, it is necessary to assume a specific long PUCCH duration and subcarrier spacing.

[0144] Hereinafter, in this specification, the assumed long PUCCH duration and subcarrier spacing are referred to as reference long PUCCH duration Lref and reference subcarrier spacing Sref, respectively. The determined number of slots of the multi-slot long PUCCH is referred to as Xref.

[0145] In addition, the long PUCCH duration and subcarrier spacing actually used for long PUCCH transmission in NR can be the same as or different from the reference values.

[0146] In this case, the values ​​used for actual transmission are referred to as actual long PUCCH duration L and actual subcarrier spacing S, respectively.

[0147] Above, the reference or actual long PUCCH duration may mean 1) the total number of symbols including UCI symbols configuring PUCCH and DMRS symbols, or 2) the number of UCI symbols used for UCI transmission among symbols configuring PUCCH.

[0148] In this case, in addition to the Lref and Sref values, NR can also support various types of long PUCCH durations and subcarrier spacings as described above. The following method is proposed as a method of setting the number of multi-slot long PUCCH slots in NR considering this situation.

[0149] Set the number of slots in multi-slot long PUCCH according to the long PUCCH duration in the same subcarrier spacing method

[0150] In the same subcarrier spacing (eg, reference subcarrier spacing), the long PUCCH duration L may be different from the reference long PUCCH duration Lref.

[0151] In this case, assuming that a separate multi-slot long PUCCH slot number value can be set for each long PUCCH duration, for example, four values ​​for each long PUCCH duration, Y = {y0, y1, y2, y3}, Z = {z0, z1, z2, z3}, etc. can be set.

[0152] In this case, the UE may select one of a plurality of multi-slot long PUCCH slot numbers (eg, Y, Z, ...) configured based on the long PUCCH duration configured according to a separate method.

[0153] Furthermore, one of the values ​​of the selected multi-slot long PUCCH slot number may be configured according to the multi-slot long PUCCH slot number indication method, and the multi-slot long PUCCH may be configured.

[0154] For example, if a multi-slot long PUCCH slot number Y has been selected by the long PUCCH duration L, one of the Y values ​​(eg, {y0, y1, y2, y3}) may be UE-specific RRC configured or may be configured by dynamic indication using DCI.

[0155] Alternatively, after the number of slots of multiple (eg, 4) multi-slot long PUCCHs is configured by UE-specific RRC, it may be dynamically configured through DCI.

[0156] In this case, the method has a disadvantage in that the signaling overhead is large because a separate multi-slot long PUCCH slot number is set for each long PUCCH duration.

[0157] Therefore, in order to improve this disadvantage, after only setting the reference multi-slot long PUCCH slot number Xref assuming Lref and Sref, the multi-slot long PUCCH slot value according to the long PUCCH duration configured relative to the UE can be implicitly indicated by Xref and Lref.

[0158] In this case, the long PUCCH duration may be referred to as L, and the corresponding number of multi-slot long PUCCH slots may be referred to as Y.

[0159] Thereafter, the UE may calculate Y for its configured long PUCCH duration using L and Lref and Xref as in the following Equation 2.

[0160] [Formula 2]

[0161] Y=Xref×L ref / L

[0162] In this case, by considering that the motivation of multi-slot long PUCCH is coverage extension, Lref may be the longest long PUCCH duration (ie, Lref=14).

[0163] If Lref / L is not an integer (eg, Lref=14 and L=10), it may be made an integer by ceiling, floor, truncation, or the like.

[0164] In order to find the minimum value of the integer that satisfies the coverage / link budget / MCL, the integerization may be an upward rounding operation such as Equation 3 and Equation 4.

[0165] [Formula 3]

[0166]

[0167] [Formula 4]

[0168]

[0169] in this case, Indicates a round-up operation.

[0170] For example, if Xref={1, 4, 16, 64} when Lref=14, then when L=10, Xref×L ref / L=(0.71,2.86,11.4,45.7}. The final Y value after rounding up is Y={1,3,12,46}.

[0171] In this case, the UE may configure a multi-slot long PUCCH using Y calculated using the above method.

[0172] Furthermore, the ceiling operation may be replaced with another integer method such as flooring or truncation.

[0173] In addition, in a state where a set Xref={1, x1, x2, x3} of the number of time slots configurable relative to a reference PUCCH symbol duration Lref (e.g., Lref=14 symbols) has been defined, the gNB can configure a value within the corresponding Xref (e.g., x1=2, x2=4, x3=6 or 8) relative to the UE.

[0174] In this case, if one value of Xref assigned by the gNB is xref, the number of multi-slot long PUCCH slots y to be applied for actual transmission can be set by the following method.

[0175] (Method 1)

[0176] If xref>1 and the actual PUCCH symbol duration is given as L symbols, the actual number of slots y can be set as in Equation 5.

[0177] [Formula 5]

[0178] y=xref×f{Lref / L}

[0179] In this case, f{·} may be a function such as ceiling, floor, or truncation.

[0180] (Method 2)

[0181] If xref=1, then with respect to a given actual PUCCH symbol duration L, the actual number of slots y may be set to y=1.

[0182] Method for setting the number of slots in a multi-slot long PUCCH when the subcarrier spacing varies

[0183] As mentioned above, in addition to the number of slots in the multi-slot long PUCCH and the long PUCCH duration, the PUCCH coverage is also related to the subcarrier spacing.

[0184] Therefore, if the long PUCCH duration is given as the number of symbols, the absolute time of the long PUCCH length becomes 1 / N times when the subcarrier spacing becomes N times even with the same long PUCCH duration. Therefore, if the transmission power is constant, the PUCCH coverage decreases proportionally.

[0185] Furthermore, generally, in a proportional relationship, since the received power is inversely proportional to the square of the distance between the transmitter and the receiver, the coverage converted to distance is inversely proportional to the square of the transmitted energy (ie, transmitted power×transmission duration).

[0186] Therefore, when the subcarrier spacing becomes N times in the above example, because the long PUCCH transmission energy becomes 1 / N times, the PUCCH coverage converted into distance becomes times.

[0187] Furthermore, the PUCCH coverage requirement may be different according to the subcarrier spacing. This can be expressed as a maximum timing advance (max TA) configuration method according to the subcarrier spacing below.

[0188] In this case, the maximum TA may be configured for each subcarrier spacing, may be configured as the same maximum TA value regardless of the subcarrier spacing, or may be configured as a system information block (SIB).

[0189] In addition, if a maximum TA is configured for each subcarrier spacing, the maximum TA may be configured to have a relationship inversely proportional to the subcarrier spacing or inversely proportional to a square root.

[0190] Therefore, the following multi-slot long PUCCH slot number setting method in each case may be considered.

[0191] If the maximum TA scales with the subcarrier spacing

[0192] If the maximum TA is scaled to be inversely proportional to the subcarrier spacing (for example, when the subcarrier spacing becomes N times of Sref, the maximum TA is scaled to become 1 / N times or ), then it can be expected that the PUCCH coverage according to the subcarrier spacing is reduced at the same rate.

[0193] Therefore, although the subcarrier spacing used for PUCCH transmission has a different value from Sref, the UE can configure a multi-slot long PUCCH by equally applying a value set based on Sref.

[0194] That is, assuming a reference multi-slot long PUCCH time slot number Xref of Lref and Sref, regardless of the subcarrier spacing relative to the long PUCCH time slot duration L as Lref, the UE can apply the Xref value as the multi-slot long PUCCH time slot number Y for the long PUCCH time slot duration L configured for the UE without making any changes.

[0195] [Formula 6]

[0196] Y=Xref

[0197] In this case, the UE may use Y calculated using Equation 6 to configure a multi-slot long PUCCH.

[0198] If the maximum TA is fixed regardless of the subcarrier spacing

[0199] The following relates to a method of setting the number of multi-slot long PUCCH slots when the Max TA is fixed regardless of the subcarrier spacing.

[0200] In other words, if all UEs operating according to various subcarrier spacings are configured to support the same PUCCH coverage, the number of multi-slot long PUCCH slots may need to be adjusted to take into account the reduction in coverage according to the subcarrier spacing.

[0201] As described above, when the subcarrier spacing S becomes N times, ie, S=N×Sref, since the PUCCH transmission duration becomes 1 / N times, the temporary coverage decreases in inverse proportion to the square root assuming the same PUCCH transmission power.

[0202] Therefore, in this case, in order to compensate for the reduction in coverage, the PUCCH transmission duration can be set to the same as the case of Sref by increasing the PUCCH transmission power by N times or increasing the number of multi-slot long PUCCH time slots under the same PUCCH transmission power by N times.

[0203] In this case, in NRs where various subcarrier spacings coexist, it may be necessary to support the same coverage or maximum TA regardless of the subcarrier spacing.

[0204] In this case, with respect to the long PUCCH duration L that is the same as Lref, the UE may calculate Y for its configured long PUCCH duration L using the subcarrier spacing S and Sref and Xref as in Equation 7.

[0205] [Formula 7]

[0206] Y=Xref×(S / S ref )

[0207] In this case, the UE may use Y calculated using the method of Formula 7 to configure a multi-slot long PUCCH.

[0208] If Max TA is configurable SIB

[0209] If Max TA can be configured as a SIB, assuming that the maximum TA assumed when determining the reference multi-slot long PUCCH slot number Xref is TAmaxref and the configured maximum TA is TAmax, the relationship between TAmax and TAmaxref can be used to determine the multi-slot long PUCCH slot number.

[0210] As mentioned above, generally, since the received power is inversely proportional to the square of the distance between the transmitter and the receiver, in other words, in order to increase the coverage converted into distance by N times, it is necessary to increase the transmission energy by N. 2 times.

[0211] In order to increase the transmission energy by N 2 times, under the same transmission power, the transmission power can be increased by N 2 times, or the transmission duration needs to be increased by N 2 times.

[0212] However, the transmission power may not be increased as in the limited coverage case.

[0213] In this case, the UE can assume the same PUCCH transmission power as when determining Xref, use the relationship between TAmax and TAmaxref as in Equation 8, and calculate the number of multi-slot long PUCCH slots Y for its configured long PUCCH duration L according to a method such as Equation 8.

[0214] [Formula 8]

[0215] Y=Xref×(TAmax / TAmax ref ) 2

[0216] More generally, the UE may calculate the number of multi-slot long PUCCH slots Y for its configured long PUCCH duration L according to a method such as Equation 9 using the following relationship between TAmax and TAmaxref.

[0217] [Formula 9]

[0218] Y=Xref×(TAmax / TAmax ref ) M

[0219] In Equation 9, M may representatively have a value of 1 or 2, and may be a value determined by considering a path loss situation of a channel.

[0220] In addition, the UE may calculate the number of multi-slot long PUCCH slots Y for its configured long PUCCH duration L using Equation 10 by considering that the subcarrier spacing S is different from Sref.

[0221] [Formula 10]

[0222] Y=Xref×(S / S ref )(TAmax / TAmax ref ) M

[0223] The UE may configure a multi-slot long PUCCH using Y calculated according to a method such as Equation 10.

[0224] If these methods are summarized, they can be expressed as in Formula 11.

[0225] [Formula 11]

[0226]

[0227] The RRC parameters according to the long PUCCH duration and / or subcarrier spacing and / or maximum TA can be configured using a relation.

[0228] In this case, the UE may configure a multi-slot long PUCCH by calculating the number of multi-slot long PUCCH slots from Xref using Equation 11.

[0229] If the UE uses this method to configure a multi-slot long PUCCH, the UE can set one of the multi-slot long PUCCH time slot number Y values ​​(for example, {y0, y1, y2, y3}) calculated using the relationship with "1" so that a single-slot long PUCCH can be selected (i.e., the time slot number of the multi-slot long PUCCH = 1).

[0230] For example, the multi-slot long PUCCH may be cancelled by replacing the maximum value of the Y values ​​(eg, {1, y1, y2, y3}) with "1".

[0231] Alternatively, for the above purpose, as with these methods, "1" may be basically supported, and the remaining values ​​may be configured to be scaled using a relationship between long PUCCH duration, subcarrier spacing, and maximum TA.

[0232] In this case, assuming that the power of the transmission signal is constant and an antenna proportional to the wavelength size of the carrier frequency of the transmission signal is used, the power of the received signal is inversely proportional to the square of the center frequency.

[0233] In this case, since the UL transmission range and the cell range are reduced according to the same relationship, the UE can equally apply the multi-slot long PUCCH slot number Y value determined in the UL reference carrier frequency.

[0234] In addition, the UE may configure a multi-slot long PUCCH slot number Y value for each carrier frequency by considering that changes in antenna size and received power in an eNB according to beamforming may be different.

[0235] Furthermore, if beamforming is applied, the UE may scale and apply the beamforming according to a path loss rate measured for each beam by combining the difference in path loss of each beam.

[0236] For example, assuming that the path losses of beam 1 and beam 2 measured using channel state information (CSI) or sounding reference signal (SRS) through DL or UL are PL1 and PL2 respectively, the UE can determine that the number of multi-slot long PUCCH time slots is Y2 when it sends beam 2 using a ratio of PL1 to PL2.

[0237] For example, if due to power limitation, the UE performs transmission using the same transmission power P, the eNB reception power of the signal sent using beam 1 is P×PL1 and the reception power of beam 2 is P×PL2, the number of multi-slot long PUCCH time slots can be scaled and applied according to the ratio of PL1 / PL2.

[0238] In other words, if the UE uses beam 1 to send multi-slot long PUCCH and changes the beam to beam 2 and performs transmission using the same transmission power, assuming that the number of multi-slot long PUCCH time slots when beam 1 is sent is Y1, it can be determined that the Y2 value of the number of multi-slot long PUCCH time slots when transmission is performed using beam 2 has a relationship such as formula 12.

[0239] [Formula 12]

[0240] Y2=Y1x(PL1 / PL2)

[0241] Skipping or rate matching operation in multi-slot long PUCCH

[0242] The PUCCH symbol duration L and the PUCCH transmission period or the corresponding multi-slot long PUCCH slot number may be RRC configured values ​​(RRC configuration), or may be values ​​indicated or determined by DCI among multiple RRC configured candidate values ​​(RRC configuration + DCI indication).

[0243] In contrast, the actual available PUCCH symbol value La within a specific PUCCH slot may be less than L due to a DL symbol or gap period or other UL resources (eg, short PUCCH, SRS).

[0244] In this case, the La value may be a value dynamically indicated through the DCI, or may be a value determined by other dynamic parameters transmitted through the DCI.

[0245] For example, the La value may be a value indicated or determined by a slot format indicator (SFI), which informs the UE of the type of the timeslot through DCI.

[0246] Therefore, the present specification proposes to operate according to the following method if the following situation is the case: the PUCCH symbol duration La in which PUCCH transmission is possible within a specific PUCCH time slot dynamically determined due to a DL symbol or gap period or other UL resources (for example, short PUCCH, SRS) is less than L in the state of the PUCCH symbol duration L and the PUCCH transmission period or the corresponding multi-slot long PUCCH time slot number indicated / configured by the RRC configuration method or the RRC configuration + DCI indication method as described above.

[0247] (Method 1)

[0248] Method 1 is to skip PUCCH transmission in the corresponding time slot.

[0249] In this method, the number of long PUCCH slots actually transmitted is reduced by as much as the PUCCH transmission has been skipped, compared to the number of multi-slot long PUCCH slots configured by the RRC configuration or RRC configuration+DCI indication method.

[0250] (Method 2)

[0251] Method 2 is a method of skipping PUCCH transmission in a corresponding slot, but extending the number of skipped slots by incorporating them into a set period or the number of multi-slot long PUCCH slots.

[0252] In this method, the number of multi-slot long PUCCH time slots configured by RRC configuration or RRC configuration+DCI indication method is the same as the number of long PUCCH time slots actually transmitted.

[0253] (Method 3)

[0254] In method 3, when the PUCCH symbol duration La becomes P% of L or more or when (L-LA) is Q symbols or less, PUCCH is transmitted in the corresponding La symbol duration. When La is less than P% of L or when (L-LA) exceeds Q symbols, method 1 or method 2 is applied.

[0255] In other words, if the actual available long PUCCH duration is reduced to Q or fewer symbols due to dynamic configuration compared to the long PUCCH duration L configured by the RRC configuration or RRC configuration + DCI indication method, PUCCH is sent by rate matching based on La symbols. Otherwise (i.e., when the difference between L and La is more than Q symbols), method 1 or method 2 is applied.

[0256] In addition, if the first Q or fewer symbols or the last Q or fewer symbols or the first certain symbols or the last certain symbols are added to the L symbol positions initially configured / indicated by RRC / DCI, PUCCH is sent through rate matching based on the La symbol duration only when Q or fewer symbols are not available. Otherwise, the method of applying method 1 or method 2 can also be adopted.

[0257] In the case of method 3, when UCI coded bits are generated based on L symbols and mapped / transmitted, or when UCI coded bits are generated based on La symbols and mapped / transmitted through rate matching based on La symbols, the UCI coded bits can be punctured through (L-La) symbols.

[0258] As described above, it is possible to apply methods 1 and 2 in the case of long PUCCH (e.g., up to 2 bits) based on time domain OCC, or to apply methods 1, 2, and 3 in the case of long PUCCH (e.g., more than 2 bits) not based on time domain OCC.

[0259] Above, the number of symbols L or La corresponding to the PUCCH symbol duration may refer to the total number of symbols of the sum of UCI symbols and DMRS symbols constituting the PUCCH, or may mean the number of symbols in which UCI is transmitted among symbols constituting the PUCCH.

[0260] In this case, the UE may have one of the methods configured from a higher layer, and the UE may be instructed in the specification so that the UE operates according to only one of the methods.

[0261] PUCCH resource configuration method in long PUCCH based on pre-DFT OCC

[0262] In NR, in order to support large UCI payload and user multiplexing at the same time, a method of transmitting long PUCCH based on pre-discrete Fourier transform (DFT) OCC can be considered.

[0263] In this case, OCC means an orthogonal cover code for user classification, and may be a Walsh code or a DFT sequence.

[0264] In this case, the OCC length in the pre-DFT based long PUCCH may be set by considering the user multiplexing capability to be supported and the UCI payload to be transmitted.

[0265] The UCI payload that can be transmitted in the pre-DFT based long PUCCH is inversely proportional to the OCC length.

[0266] Therefore, by considering the UCI payload and user multiplexing capability, the OCC length can be flexibly set through higher layer signaling or dynamic indication through DCI.

[0267] Furthermore, for coherent demodulation of the PUCCH, reference signal (RS) transmission for channel estimation is necessary for each UE.

[0268] In this case, the following method can be considered as an orthogonal RS transmission method for channel separation between users.

[0269] (Method 1)

[0270] This is the Code Division Multiplexing (CDM) transmission method.

[0271] The CDM transmission method is a method of overlapping and transmitting (quasi) orthogonal codes.

[0272] For example, if PUCCH is transmitted in one RB, the RS of each UE can be transmitted in the entire RB (sequence length = 12).

[0273] In this case, the orthogonal sequences can be different time-domain cyclic shifts (CS) in the same sequence.

[0274] (Method 2)

[0275] This is the frequency-division multiplexing (FDM) transmission method.

[0276] The FDM transmission method is a transmission method using different frequency resources. Transmission can be performed by continuously allocating frequency resources (continuous FDM), or can be performed for each UE or in a cross manner with a comb form (comb-shaped FDM).

[0277] In the following, some methods for defining PUCCH resources of long PUCCH based on pre-DFT OCC are proposed by considering UCI and RS transmission methods.

[0278] (Method 1)

[0279] Method for defining PUCCH resources by pairing UCI part (OCC) with RS

[0280] Method 1-A : A method of defining PUCCH resources by pairing OCC (UCI) with comb index (RS)

[0281] As an example, the case of cross transmission using a comb form in the FDM RS transmission method is described. If OCC of length N is configured in the UCI part, assuming the code index of each of the N OCCs is n (0 <= n < N, n: integer), N PUCCH resources can be configured by pairing n with each of the N RS combs {(0, N, 2N,...), (1, N + 1, 2N + 1,...),... (N - 1, 2N - 1, 3N - 1,...)}.

[0282] Method 1-B : A method of defining PUCCH resources by pairing OCC (UCI) with continuous FDM index (RS)

[0283] For example, if an OCC of length N is configured in the UCI section and the number of subcarriers used for PUCCH transmission is N PUCCH, assuming that the code index of each of the N OCCs is n (0 <= n < N, n: integer), N PUCCH resources can be configured by pairing n with each of the N RS FDMs {(0, 1, 2,...), (NPUCCHSC / N, NPUCCHSC / N + 1, NPUCCHSC / N + 2,...),... (NPUCCHSC - NPUCCHSC / N, NPUCCHSC - NPUCCHSC / N + 1, NPUCCHSC - NPUCCHSC / N + 2,...)}.

[0284] Method 1-C : Method for defining PUCCH resources by pairing OCC (UCI) with CS (RS)

[0285] If RS is classified based on different CSs in the CDM RS transmission method, and if an OCC of length N is configured in the UCI section, assuming that the code index of each of the N OCCs is n (0 <= n < N, n: integer), N PUCCH resources can be configured by pairing n with each of the N CS indices m (0 <= m < N, m: integer).

[0286] If users are multiplexed, it is beneficial in terms of channel estimation because the DMRS CS distance between users increases. When performing pairing as described above considering this advantage, CS = 0, 3, 6, 9 can be defined to be paired with OCC code indices n = 0, 1, 2, 3 respectively with respect to OCC length 4, and (n = 0, 1) can be paired with CS = 0, 6 in the case of OCC length 2.

[0287] Method 1-D : Method for defining PUCCH resources by pairing OCC (for UCI) with (comb - type FDM, CS) combination (for RS)

[0288] For example, if an OCC of length N is configured in the UCI section, assuming that the code index of each of the N OCCs is n (0 <= n < N, n: integer), N PUCCH resources can be configured by pairing the code index n applied to UCI with N (comb, CS) combinations used for RS configuration.

[0289] In this case, assuming that the number of combs for configuring N RS index combinations is Ncomb and the number of CSs is Ncs, N = Ncomb × Ncs is satisfied.

[0290] For example, if N = 4, the (comb, CS) combinations corresponding to four RS indices can be configured (in this case, X > 0) as (even subcarrier index, CS = 0), (even subcarrier index, CS = X), (odd subcarrier index, CS = 0), (odd subcarrier index, CS = X).

[0291] Method 1-E : A method for defining PUCCH resources by pairing OCC (for UCI) with (continuous FDM, CS) combinations (for RS).

[0292] For example, if OCC of length N has been configured in the UCI part, assuming the code index of each of the N OCCs is n (0 <= n < N, n: integer), N PUCCH resources can be configured by pairing the code index n applied to UCI with N (continuous FDM, CS) combinations for RS configuration.

[0293] In this case, assuming the number of continuous FDMs configuring N RS index combinations is Nfdm and the number of CSs is Ncs, it satisfies N = Nfdm × Ncs.

[0294] For example, if N = 4, the (continuous FDM, CS) combinations corresponding to four RS indices can be configured (in this case, X > 0) as (subcarrier index CS = 0), (subcarrier index CS = X), (subcarrier index CS = 0), (subcarrier index CS = X).

[0295] Methods 1-A to 1-E are methods for generating N combinations by pre-specifying a one-to-one correspondence with respect to N UCI OCC indices and N RS indices (e.g., CS index, comb index, continuous FDM index) or combinations thereof.

[0296] In this case, the one-to-one correspondence between OCC (UCI) and RS can be fixed as one of methods 1-A to 1-E in the specification, or can be configured as one of the methods by RRC signaling.

[0297] For example, this can be in the form of indicating whether to pair the comb index of RS (method 1-A) with OCC (UCI) using 1 bit of RRC signaling to define PUCCH resources, or whether to pair the CS index of RS (method 1-C) to define PUCCH resources.

[0298] (Method 2)

[0299] Method 2 is a method of defining a combination of a UCI part and all RSs as a PUCCH resource.

[0300] In other words, if method 1 has made one RS index correspond to one OCC, method 2 is a method of defining PUCCH resources so that they can be selected by making all or a plurality of RSs correspond to one OCC.

[0301] For example, this is a method of defining a PUCCH resource such that two RS indexes correspond to one OCC so that the PUCCH resource is selected.

[0302] In this case, the two indexes may be different comb indices, or may be different consecutive FDM indices, or may be different CS indices.

[0303] Inter-cell interference randomization method in long PUCCH based on pre-DFT OCC

[0304] Per-symbol OCC is used to support multiplexing between users in the pre-DFT OCC based long PUCCH transmission method.

[0305] If OCC is used, orthogonality between users using different OCC codes within the same cell can be guaranteed, but interference may still occur between cells.

[0306] For example, inter-cell interference may be interference between UEs using the same OCC code of different cells.

[0307] Therefore, this specification proposes that, in this case, cell-specific symbol / hopping / time slot level OCC hopping is applied to the pre-DFT OCC-based long PUCCH to perform inter-cell interference randomization.

[0308] In this case, the period of the cell-specific OCC hopping may be a symbol unit, or if frequency hopping is configured, a frequency hopping unit, or may be a hopping of a slot unit (inter-slot OCC hopping).

[0309] Furthermore, in cell-specific symbol / hopping / slot level OCC hopping, OCC hopping may be performed based on a random hopping pattern classified for each cell.

[0310] In this case, in order to generate a special symbol / hopping / slot level OCC hopping pattern for each cell, a random hopping pattern generation method derived from a physical cell ID or a virtual cell ID may be used.

[0311] In addition, configuration may be performed by higher layer signaling so that a physical cell ID and a virtual cell ID as parameters for a random hopping pattern generation method are selected.

[0312] In addition, the UE can generate a cell-specific symbol / hopping / time slot level OCC hopping pattern through the allocated OCC index, symbol / hopping / time slot index, cell ID, etc. without separate additional signaling, and can send UCI information.

[0313] In addition, if cell-specific symbol / hopping / time slot level OCC hopping is applied to UCI in the pre-DFT OCC based long PUCCH, the UE generates the PUCCH RS required for channel estimation of the UCI transmission channel with reference to the CS / comb index / continuous FDM index of the RS paired with the OCC (UCI part) allocated to the RS according to the "Method of defining PUCCH resources by pairing the UCI part (OCC) with the RS".

[0314] Alternatively, the UE may refer to the CS / comb index / contiguous FDM index of the RS configured with respect to the OCC (UCI part) allocated for the RS according to the “method of defining PUCCH resources by pairing the UCI part with a combination of all RSs”.

[0315] In this case, in the case of RS, 1) the same RS is configured within the time slot, and it can be determined that the corresponding RS has been paired with the OCC for a specific (e.g., first) frequency hopping or a specific (e.g., first) symbol within the long PUCCH, 2) one RS is configured for each frequency hopping, and it can be determined that the corresponding RS has been paired with the corresponding frequency hopping or the OCCU for a specific (e.g., first) symbol within the frequency hopping.

[0316] In contrast, if OCC (for UCI) and CS / comb index / continuous FDM index (for RS) are previously paired and resources are allocated, CS / comb index / continuous FDM index (for RS) hopping is performed on RS in order to perform inter-cell interference randomization. The UE can obtain OCC information to be applied to (paired) UCI ​​through the corresponding RS hopping information, and can apply the OCC information to the UCI part.

[0317] Multi-slot long PUCCH transmission operation in dynamic TDD scenario

[0318] Hereinafter, an operation of transmitting a long PUCCH using multiple slots in a dynamic time division duplex (TDD) situation is described.

[0319] In this case, the operation of transmitting the long PUCCH using a plurality of slots may include an operation of repeatedly transmitting the long PUCCH in a plurality of slots.

[0320] In this specification, TDD may be referred to as an unpaired spectrum or frame structure type 2, and frequency division duplex (FDD) may be referred to as a paired spectrum or frame structure type 1.

[0321] Hereinafter, transmission of a long PUCCH using a plurality of slots is briefly expressed as 'multi-slot long PUCCH'.

[0322] NR dynamically adjusts in response to changes in the amount of uplink (UL) traffic and / or downlink (DL) traffic, and can support dynamic TDD to efficiently support TDD between different services (e.g., low-latency services, high data rate services).

[0323] In this case, as a method of supporting dynamic TDD, a DL time slot, a UL time slot, an unknown time slot, and a reserved time slot may be semi-statically or dynamically configured.

[0324] In this case, the "reserved time slot" is a time slot for gNB for TDD with another system or for other specific purposes other than DL and / or UL data transmission of NR, and may be a time slot in which UL and / or DL ​​data transmission of NR is not allowed.

[0325] Additionally, an "unknown time slot" may be used for objects that are substantially the same or similar to a reserved time slot.

[0326] In this case, the 'unknown time slot' is a time slot through which the gNB supports dynamic DL and / or UL transmission when necessary, and means a time slot that can cover the time slot format.

[0327] In this case, the slot format such as DL / UL / unknown slot may be semi-statically or dynamically configured by the gNB.

[0328] With respect to the UE, the slot format configured as described above may be indicated by a semi-static slot format indicator (SFI) (in the case of semi-static configuration) or a dynamic SFI (in the case of dynamic configuration).

[0329] Additionally, the reserved time slots may be semi-statically configured by the gNB and may be indicated via semi-static RRC signaling relative to the UE.

[0330] In this case, DL / UL / unknown / reserved may have been configured semi-statically or dynamically in symbol units.

[0331] In this case, when a multi-slot long PUCCH is sent in N time slots, the transmission duration of the multi-slot long PUCCH is configured by the time slot and the number of time slots. In this semi-static and / or dynamic TDD situation, the multi-slot long PUCCH can operate according to the following methods (option 1-1 to option 1-2).

[0332] (Option 1-1)

[0333] Option 1-1 is a method of transmitting the first slot of a multi-slot long PUCCH in a slot designated as a starting slot (UL or unknown), and transmitting subsequent (N-1) slots only in slots configured as UL by semi-static SFI (or dynamic SFI).

[0334] More specifically, the subsequent (N-1) time slots may be transmitted only in time slots configured as UL by the semi-static SFI, or may be transmitted in time slots configured as UL by the semi-static SFI and additionally configured as UL by the dynamic SFI.

[0335] In this case, the subsequent (N-1) slots mean slots in which a multi-slot long PUCCH is transmitted.

[0336] (Option 1-2)

[0337] Option 1-2 is a method of transmitting the first slot of a multi-slot long PUCCH in a slot designated as a starting slot (UL or unknown) and then transmitting (N-1) slots only in slots configured as UL or unknown by semi-static SFI (or dynamic SFI).

[0338] More specifically, the subsequent (N-1) time slots may be transmitted only in time slots configured as UL by the semi-static SFI, or may be transmitted in time slots configured as UL by the semi-static SFI and additionally configured as UL by the dynamic SFI.

[0339] In this case, in options 1-1, 1-2, the first timeslot transmission may be valid only when the starting timeslot is configured as unknown or UL by semi-static SFI (or dynamic SFI).

[0340] In the above, the meaning of “a specific time slot has been configured as UL” may mean that all symbols or most symbols of the PUCCH transmission duration in the corresponding time slot have been configured as UL.

[0341] Alternatively, above, the meaning of “a specific time slot has been configured as UL” may be limited to the case where the number of uplink symbols that can be used for PUCCH transmission within the time slot is greater than or equal to the configured PUCCH duration (in symbol units).

[0342] In this case, when the number of uplink symbols that can be used for PUCCH transmission within a slot is less than the configured PUCCH duration (in symbol units), it can be determined that the corresponding slot is not UL or unknown and can be operated.

[0343] In this case, if DL / UL / unknown / reserved is configured in symbol units, the number of uplink symbols may include counting only UL symbols or may include UL symbols and unknown symbols.

[0344] In addition, if some of the PUCCH durations (in symbol units) configured for PUCCH transmission within a slot are not UL symbols, it may be determined that the corresponding slot is not UL or unknown and operate.

[0345] For example, if the difference between PUCCH durations (in symbols) configured for PUCCH transmission within a time slot exceeds 1 symbol, it may be determined that the corresponding time slot is not UL or unknown and an operation may be performed.

[0346] Alternatively, if the duration configured with continuous uplink symbols that can be used for PUCCH transmission does not completely include the configured PUCCH start symbol index and PUCCH duration (in symbols), it can be determined that the corresponding time slot is not UL or unknown and operate.

[0347] Alternatively, if the starting slot in which the multi-slot long PUCCH is transmitted has not been configured as UL by semi-static SFI (or dynamic SFI) or is configured as UL or unknown, the corresponding slot may operate according to the following method (option 2-1 to option 2-2).

[0348] (Option 2-1)

[0349] Option 2-1 is a method of transmitting a multi-slot long PUCCH in only N slots configured as UL by a semi-static SFI (or dynamic SFI) among subsequent slots including a slot designated as a start slot.

[0350] More specifically, the multi-slot long PUCCH can be transmitted only in a time slot configured as UL by a semi-static SFI among subsequent time slots including a time slot designated as a start time slot, or can be transmitted in a time slot configured as UL by a semi-static SFI and additionally configured as UL by a dynamic SFI.

[0351] (Option 2-2)

[0352] Option 2-2 is a method of transmitting a multi-slot long PUCCH in N slots configured as UL or unknown by a semi-static SFI (or dynamic SFI) among subsequent slots including a slot designated as a start slot.

[0353] More specifically, the multi-slot long PUCCH can be transmitted only in a time slot configured as UL by a semi-static SFI among subsequent time slots including a time slot designated as a start time slot, or can be transmitted in a time slot configured as UL by a semi-static SFI and additionally configured as UL by a dynamic SFI.

[0354] In this case, the meaning that a specific time slot has been configured as UL may mean that all or most symbols in a PUCCH transmission duration within the corresponding time slot have been configured as UL.

[0355] Alternatively, the meaning that a particular time slot has been configured as UL may be limited to the case where the number of uplink symbols that can be used for PUCCH transmission within the time slot is greater than or equal to the configured PUCCH duration (in symbols).

[0356] In this case, when the number of uplink symbols that can be used for PUCCH transmission within a slot is greater than the configured PUCCH duration (in symbol units), it can be determined that the corresponding slot is not UL or unknown and operate.

[0357] In addition, if DL / UL / unknown / reserved is configured in symbol units, the number of uplink symbols may include counting only UL symbols or may include UL symbols and unknown symbols.

[0358] In addition, if some of the PUCCH durations (in symbol units) configured for PUCCH transmission within a slot are not UL symbols, it may be determined that the corresponding slot is not UL or unknown and operate.

[0359] For example, if the difference between PUCCH durations (in symbols) configured for PUCCH transmission within a slot is 1 or exceeds 1 symbol, it may be determined that the corresponding slot is not UL or unknown and an operation may be performed.

[0360] Alternatively, if a duration configured with consecutive uplink symbols that can be used for PUCCH transmission does not completely include the configured PUCCH start symbol index and PUCCH duration (in symbols), it can be determined that the corresponding time slot is not UL or unknown and operate.

[0361] A particular method may be configured semi-statically or dynamically in the same manner as operating according to one of the four options described above.

[0362] For example, which of the four options will be applied, which method of options 1-1 and 1-2 will be applied, or which method of options 2-1 and 2-2 will be applied may be dynamically indicated by indicating DCI for PUCCH transmission with respect to the UE.

[0363] Multi-slot long PUCCH may skip PUCCH transmission relative to slots configured as DL and / or reserved by semi-static SFI (or dynamic SFI).

[0364] In this case, the omitted slot may be counted as one of the N slots allocated for PUCCH transmission, or may not be counted.

[0365] As described above, in multi-slot long PUCCH transmission in FDD / TDD (or paired / unpaired spectrum), the actual time slot to be transmitted can be determined by the following steps.

[0366] In this case, the number of transmission slots configured in the corresponding multi-slot long PUCCH may be set to N, and the transmission symbol region within the transmission slot may be configured (or indicated) as K symbols starting from symbol #K1.

[0367] (Step 1)

[0368] In the first step (step 1) of determining time slots for multi-slot long PUCCH transmission, in the case of semi-static DL / UL configuration, N time slots configured with K UL symbols starting from symbol #K1 configured as time slots of unknown or UL are determined as multi-slot long PUCCH transmission time slots.

[0369] For example, if a multi-slot long PUCCH is indicated (or configured) during 4 time slots starting from time slot #0 and K1=5, K=6 are indicated (or configured), then when time slots #0 / #1 / #2 / #3 / #4 / #5 / #6 are configured as DL symbols / all DL symbols / 10 DL symbols + four unknown symbols / all unknown symbols / all UL symbols / all UL symbols / all UL symbols through semi-static DL / UL configuration, time slots #3 / #4 / #5 / #6 can be determined as the corresponding multi-slot long PUCCH transmission slots.

[0370] (Step 2)

[0371] Next, in the second step (step 2) of determining the time slots for multi-slot long PUCCH transmission, in the case of dynamic SFI (or group common PDCCH) configuration, the DL / unknown / UL area can be signaled relative to the symbols (or time slots) that are configured as unknown by the semi-static DL / UL configuration (or if the semi-static DL / UL configuration has not been configured).

[0372] That is, if dynamic SFI is configured and the corresponding time slot indicated by the dynamic SFI among the time slots determined for the multi-slot long PUCCH transmission in step 1 (in particular, the time slots configured as unknown by the semi-static DL / UL configuration) will be configured as UL (and / or unknown) for K UL symbols starting from symbol #K1, long PUCCH transmission may not be performed on the corresponding time slot.

[0373] In addition, if dynamic SFI has been configured but dynamic SFI information about the time slot determined for the multi-slot long PUCCH transmission in step 1 (in particular, the time slot configured as unknown by the semi-static DL / UL configuration) has not yet been received, long PUCCH transmission may not be performed in the corresponding time slot, and rules for performing long PUCCH transmission in the corresponding time slot may be configured.

[0374] In this case, in the case of a multi-slot long PUCCH (or multi-slot PUSCH) indicated by dynamic L1 signaling (e.g., DL assignment, UL grant), multi-slot long PUCCH (or multi-slot PUSCH) transmission can be performed during N time slots by only applying step 1 without applying step 2.

[0375] In addition, in the case of a multi-slot long PUCCH (e.g., a scheduling request, a periodic CSI transmission, or a multi-slot PUSCH) indicated by RRC signaling (or a combination of RRC signaling and DCI, e.g., semi-persistent transmission), the multi-slot long PUCCH (or multi-slot PUSCH) transmission can be omitted in some of the N time slots by applying both steps 1 and 2.

[0376] Alternatively, in UCI transmission, multi-slot long PUCCH transmission may be performed during N slots by always applying only step 1 but not step 2 regardless of the triggering means (whether L1 signaling or RRC signaling).

[0377] More specifically, in a (multi-slot) data transmission not including UCI, (multi-slot) PUSCH transmission may be omitted in some of the N slots by applying both step 1 and step 2.

[0378] The multi-slot long PUCCH transmission operation in the dynamic TDD case can be equally applied to the multi-slot PUSCH transmission operation of transmitting PUSCH in multiple slots for uplink coverage extension.

[0379] Multi-slot long PDSCH reception operation in dynamic TDD scenario

[0380] Furthermore, a multi-slot long PUCCH transmission operation may be applied as follows to a multi-slot PDCH transmission in which a PDSCH is transmitted in a plurality of slots for downlink coverage extension.

[0381] (Option 1-1)

[0382] The first slot of the multi-slot PDSCH is transmitted in a slot designated as a starting slot (DL or unknown), and subsequent (N-1) slots are transmitted only in slots configured as DL by semi-static SFI (or dynamic SFI).

[0383] In addition, the subsequent (N-1) time slots may be transmitted only in the time slots configured as DL by the semi-static SFI, or may be transmitted in the time slots configured as DL by the semi-static SFI and additionally configured as DL by the dynamic SFI.

[0384] (Option 1-2)

[0385] The first slot of the multi-slot PDSCH is transmitted in a slot designated as a starting slot (DL or unknown), and subsequent (N-1) slots are transmitted only in slots configured as DL or unknown by a semi-static SFI (or dynamic SFI).

[0386] In addition, the subsequent (N-1) time slots may be transmitted only in the time slots configured as DL by the semi-static SFI, or may be transmitted in the time slots configured as DL by the semi-static SFI and additionally configured as DL by the dynamic SFI.

[0387] In this case, the first timeslot transmission may be valid only when the starting timeslot is configured as unknown or DL ​​by the semi-static SFI (or dynamic SFI).

[0388] In this case, the meaning that a specific time slot has been configured as DL may mean that all or most symbols in a PDSCH transmission duration within the corresponding time slot have been configured as DL.

[0389] Alternatively, above, the meaning that a specific time slot has been configured as DL may be limited to the case where the number of DL symbols that can be used for PDSCH transmission within the time slot is greater than or equal to the configured PDSCH duration (in symbol units).

[0390] In this case, when the number of DL symbols that can be used for PDSCH transmission within a slot is less than the configured PDSCH duration (in symbol units), it may be determined that the corresponding slot is not DL or unknown and an operation is performed.

[0391] In addition, if DL / UL / unknown / reserved is configured in symbol units, the number of DL symbols may include counting only UL symbols or may include DL symbols and unknown symbols.

[0392] In addition, if some of the PDSCH durations (in symbol units) configured for PDSCH transmission within a slot are not DL symbols, it may be determined that the corresponding slot is not DL or unknown and operate.

[0393] For example, if the difference between the PDSCH duration (in symbols) configured for PDSCH transmission in a slot and the DL symbol is 1 or more, it may be determined that the corresponding slot is not DL or unknown and an operation is performed.

[0394] Alternatively, if the starting time slot has not been configured as DL by the semi-static SFI (or dynamic SFI) or is configured as DL or unknown, the corresponding time slot may be operated according to the following method.

[0395] (Option 2-1)

[0396] The multi-slot PDSCH is transmitted only in N slots configured as DL by the semi-static SFI (or dynamic SFI) among subsequent slots including the slot designated as the start slot.

[0397] In addition, the multi-slot PDSCH can be transmitted only in a slot configured as DL by a semi-static SFI among subsequent slots including a slot designated as a start slot, or can be transmitted in a slot configured as DL by a semi-static SFI and additionally configured as DL by a dynamic SFI.

[0398] (Option 2-2)

[0399] The multi-slot PDSCH is transmitted only in N slots configured as DL by the semi-static SFI (or dynamic SFI) among subsequent slots including the slot designated as the start slot.

[0400] In addition, the multi-slot PDSCH can be transmitted only in a slot configured as DL by a semi-static SFI among subsequent slots including a slot designated as a start slot, or can be transmitted in a slot configured as DL by a semi-static SFI and additionally configured as DL by a dynamic SFI.

[0401] In this case, the meaning that a specific time slot has been configured as DL may mean that all or most symbols in a PDSCH transmission duration within the corresponding time slot have been configured as DL.

[0402] Alternatively, the meaning that a particular time slot has been configured as DL may be limited to the case where the number of DL symbols that can be used for PDSCH transmission within the time slot is greater than or equal to the configured PDSCH duration (in symbols).

[0403] In this case, when the number of DL symbols that can be used for PDSCH transmission within a slot is less than the configured PDSCH duration (in symbol units), it may be determined that the corresponding slot is not DL or unknown and an operation is performed.

[0404] In addition, if DL / UL / unknown / reserved is configured in symbol units, the number of DL symbols may include counting only UL symbols or may include DL symbols and unknown symbols.

[0405] In addition, if some of the PDSCH durations (in symbol units) configured for PDSCH transmission within a slot are not DL symbols, it may be determined that the corresponding slot is not DL or unknown and operate.

[0406] For example, when the difference between the PDSCH duration (in symbol units) configured for PDSCH transmission within a slot and the DL symbol is 1 or more, it may be determined that the corresponding slot is not DL or unknown and an operation is performed.

[0407] In this case, the corresponding time slots may be configured semi-statically or dynamically in the same manner as operating according to one of the options.

[0408] For example, which method among the four options will be applied, or which method among options 1-1 and 1-2 will be applied, or which method among options 2-1 and 2-2 will be applied may be dynamically indicated through DCI scheduling the PDSCH.

[0409] Multi-slot PDSCH can skip PDSCH transmission in slots configured as UL and / or reserved by semi-static SFI (or dynamic SFI).

[0410] The omitted slot may be counted as one of the N slots allocated for PUCCH transmission, or may not be counted.

[0411] From the perspective of a UE, PDSCH transmission may mean a PDSCH reception operation.

[0412] Furthermore, the multi-slot long PDSCH reception operation in the dynamic TDD case can be equally applied to the multi-slot PUSCH transmission operation of transmitting the PDCCH in multiple slots for downlink coverage extension.

[0413] Frequency Hopping Operation of Multi-slot Long PUCCH in Dynamic TDD Scenario

[0414] When PUCCH is repeatedly transmitted in multiple time slots in order to improve the coverage of PUCCH, in addition to repetition gain, inter-time slot frequency hopping may be applied to additionally obtain frequency diversity.

[0415] Inter-time slot frequency hopping refers to the operation of changing the position of the frequency resource transmitted in each time slot to obtain frequency diversity.

[0416] It is possible to perform this inter-slot frequency hopping using both a random frequency hopping method and a deterministic method.

[0417] The random frequency hopping method generates a frequency hopping pattern in each time slot through a random number generator.

[0418] In addition, for example, a deterministic frequency hopping method may be implemented by determining a plurality of frequency positions and moving to one of the determined frequency positions in each time slot.

[0419] For a simple example, after two frequency resources f1 and f2 are configured through higher layer and / or L1 signaling, alternative shifts of f1 and f2 may be performed every time slot.

[0420] In this case, the frequency hopping pattern for inter-slot frequency hopping may be defined as a function of the slot index.

[0421] Hereinafter, this specification proposes an inter-time slot frequency hopping method.

[0422] In this frequency hopping method, the limitation of time slots capable of PUCCH transmission in dynamic TDD has been considered and can be changed semi-statically or dynamically.

[0423] First, in the following proposals, the meaning that a specific time slot has been configured as UL complies with the definition in Section 3.5 (Multi-slot long PUCCH transmission operation in dynamic TDD case).

[0424] Furthermore, the meaning of skipping PUCCH transmission hereinafter means that PUCCH is considered to have been transmitted and the number of multi-slot long PUCCH transmissions is counted.

[0425] Furthermore, the meaning of maintaining (or deferring) a PUCCH transmission hereinafter means not counting it as the number of multi-slot long PUCCH transmissions.

[0426] (Method 1)

[0427] Each time slot index ns generates a new frequency hopping pattern.

[0428] In this case, the slot index ns means an index that is counted regardless of the slot format (UL / DL / unknown / reserved).

[0429] In the case of method 1, PUCCH transmission is skipped or maintained (or postponed) with respect to a slot not configured as UL, but a frequency hopping pattern is generated regardless of the slot format. In this case, the application in the corresponding slot is skipped.

[0430] That is, a frequency hopping pattern is generated in all time slots, but the generated values ​​are not applied to actual frequency hopping.

[0431] Thereafter, when PUCCH transmission starts again in a slot configured as UL, a frequency hopping pattern value newly generated using the corresponding slot index is applied.

[0432] In method 1, for example, in the case of f1 and f2 frequency hopping, if only even-numbered or odd-numbered time slots are configured as UL, since PUCCH is transmitted using f1 or f2 value, frequency diversity gain cannot be sufficiently obtained.

[0433] (Method 2)

[0434] This is a method that generates a new frequency hopping pattern per UL slot index.

[0435] In this case, the UL slot index 'ns_u' means an index counting only slots configured as UL.

[0436] In method 2, for the case of skipping or maintaining (or postponing) PUCCH transmission with respect to a slot not configured as UL, since the corresponding UL slot index is not increased, the generation of the frequency hopping pattern is also maintained (or postponed).

[0437] The difference between method 1 and method 2 is as follows.

[0438] For example, in f1, f2 frequency hopping, since the frequency hopping pattern of f1→f2→f1→f2→,… is maintained although only even or odd time slots are configured as UL, method 2 can obtain the same frequency diversity gain as the case where all time slots have been configured as UL.

[0439] (Method 3)

[0440] This is a method of generating a frequency hopping pattern based on a UL slot index based on a semi-static slot format configuration.

[0441] In this case, the UL slot index 'ns_u_ss' means an index counting only slots configured as UL by the semi-static slot format configuration.

[0442] In method 3, after a frequency hopping pattern is generated based on a semi-static UL / DL configuration as in method 2, application of the frequency hopping pattern is skipped when some of the time slots previously configured as UL are changed to DL through dynamic SFI (for example, when an unknown time slot capable of UL transmission is specified for DL ​​transmission use through DCI).

[0443] Figure 5 is a flowchart showing an example of an operation method of a UE transmitting a long PUCCH using a plurality of time slots proposed in this specification.

[0444] First, the UE receives first information about time division duplex (TDD) uplink (UL)-downlink (DL) time slot configuration from a base station (S510).

[0445] In addition, the UE receives second information from the base station, the second information including a first parameter indicating the number of slots for long PUCCH transmission and a second parameter indicating a duration of a PUCCH symbol within the PUCCH slot (S520).

[0446] In addition, the UE determines a plurality of slots for transmitting the long PUCCH based on the first information and the second information (S530).

[0447] The number of slots for transmitting the long PUCCH may be determined to be a specific number of slots from the configured start slot.

[0448] The specific number of time slots may consist of UL time slots or unknown time slots. Alternatively, the specific number of time slots may include UL time slots or unknown time slots.

[0449] The UL time slot may mean a time slot in which the number of UL symbols available for transmission of the long PUCCH within the time slot is greater than or equal to the second parameter.

[0450] In addition, the UE transmits a long PUCCH over a plurality of slots to the base station (S540).

[0451] If the number of UL symbols available for transmission of the long PUCCH in a specific slot among the determined slots is less than a second parameter, the long PUCCH may not be transmitted on the specific slot.

[0452] In addition, after step S510, the UE may receive a slot format indicator (SFI) for providing notification of a specific TDD UL-DL slot format from the base station.

[0453] In addition, the long PUCCH may be transmitted using a pre-discrete Fourier transform (DFT) orthogonal cover code (OCC).

[0454] More specifically, the long PUCCH resource may be determined by pairing an OCC associated with an uplink control information (UCI) part with a cyclic shift (CS) associated with a reference signal.

[0455] Reference Figure 5 and Figures 7 to 10 The contents of implementing long PUCCH transmission in a UE device proposed in this specification are described.

[0456] In a wireless communication system, a UE that transmits a long physical uplink control channel (PUCCH) using a plurality of time slots may include a Radio Frequency (RF) module for transmitting and receiving radio signals and a processor functionally connected to the RF module.

[0457] First, a processor of the UE controls the RF module to receive first information about a time division duplex (TDD) uplink (UL)-downlink (DL) time slot configuration from a base station.

[0458] In addition, the processor controls the RF module to receive second information from the base station, the second information including a first parameter indicating the number of slots for long PUCCH transmission and a second parameter indicating a duration of a PUCCH symbol within the PUCCH slot.

[0459] Furthermore, the processor determines a plurality of time slots for transmitting the long PUCCH based on the first information and the second information.

[0460] The number of slots for transmitting the long PUCCH may be determined to be a specific number of slots from the configured start slot.

[0461] The specific number of time slots may consist of UL time slots or unknown time slots. Alternatively, the specific number of time slots may include UL time slots or unknown time slots.

[0462] The UL time slot may mean a time slot in which the number of UL symbols available for PUCCH transmission within the time slot is greater than or equal to the second parameter.

[0463] In addition, the processor controls the RF module to transmit the long PUCCH to the base station over a plurality of time slots.

[0464] If the number of UL symbols available for transmission of the long PUCCH in a specific slot among the determined slots is less than the second parameter, the long PUCCH using a plurality of slots may not be transmitted at the specific slot.

[0465] In addition, the processor may control the RF module to receive a slot format indicator (SFI) for providing notification of a specific TDD UL-DL slot format from the base station.

[0466] In addition, the long PUCCH may be transmitted using a pre-discrete Fourier transform (DFT) orthogonal cover code (OCC).

[0467] More specifically, the long PUCCH resource may be determined by pairing an OCC associated with an uplink control information (UCI) part with a cyclic shift (CS) associated with a reference signal.

[0468] Figure 6 is a flowchart showing an example of an operation method of a base station receiving a long PUCCH using a plurality of time slots proposed in this specification.

[0469] First, the base station transmits first information about time division duplex (TDD) uplink (UL)-downlink (DL) time slot configuration to the UE (S610).

[0470] In addition, the base station transmits second information to the UE, the second information including a first parameter indicating the number of slots used for long PUCCH transmission and a second parameter indicating a duration of a PUCCH symbol within the PUCCH slot (S620).

[0471] In addition, the base station receives the long PUCCH from the UE over a plurality of slots (S630).

[0472] The plurality of time slots may be determined to be a specific number of time slots from a configured start time slot.

[0473] The specific number of time slots may consist of UL time slots or unknown time slots. Alternatively, the specific number of time slots may include UL time slots or unknown time slots.

[0474] The UL time slot may mean a time slot in which the number of UL symbols available for transmission of the long PUCCH within the time slot is greater than or equal to the second parameter.

[0475] When the number of UL symbols available for transmission of the long PUCCH in a specific slot among the determined slots is less than a second parameter, the long PUCCH may not be received at the specific slot.

[0476] In addition, after step S610, the base station may transmit a slot format indicator (SFI) for providing notification of a specific TDD UL-DL slot format to the UE.

[0477] In addition, the long PUCCH may be received using a pre-discrete Fourier transform (DFT) orthogonal cover code (OCC).

[0478] More specifically, the long PUCCH resource may be determined by pairing an OCC associated with an uplink control information (UCI) part with a cyclic shift (CS) associated with a reference signal.

[0479] Described is a method for implementing a reference in a base station device Figures 6 to 10 The content of long PUCCH is received using multiple time slots as proposed in this specification.

[0480] In a wireless communication system, a base station that receives a long physical uplink control channel (PUCCH) using a plurality of time slots may include a Radio Frequency (RF) module for transmitting and receiving radio signals and a processor functionally connected to the RF module.

[0481] First, a processor of the base station controls the RF module to send first information about time division duplex (TDD) uplink (UL)-downlink (DL) time slot configuration to the UE.

[0482] In addition, the processor controls the RF module to transmit second information to the UE, the second information including a first parameter indicating the number of time slots used for long PUCCH transmission and a second parameter indicating a duration of a PUCCH symbol within the PUCCH time slot.

[0483] In addition, the base station controls the RF module to receive the long PUCCH over multiple time slots.

[0484] The plurality of time slots may be determined to be a specific number of time slots from a configured start time slot.

[0485] The specific number of time slots may consist of UL time slots or unknown time slots. Alternatively, the specific number of time slots may include UL time slots or unknown time slots.

[0486] The UL time slot may mean a time slot in which the number of UL symbols available for transmission of the long PUCCH within the time slot is greater than or equal to the second parameter.

[0487] When the number of UL symbols available for transmission of the long PUCCH in a specific slot among the plurality of slots is less than a second parameter, the long PUCCH may not be received on the specific slot.

[0488] In addition, the processor may control the RF module to transmit a slot format indicator (SFI) for providing notification of a specific TDD UL-DL slot format to the UE.

[0489] In addition, the long PUCCH may be received using a pre-discrete Fourier transform (DFT) orthogonal cover code (OCC).

[0490] More specifically, the long PUCCH resource may be determined by pairing an OCC associated with an uplink control information (UCI) part with a cyclic shift (CS) associated with a reference signal.

[0491] The above methods may be performed independently, or may be combined in various ways and performed using a plurality of time slots proposed in the present specification to perform transmission / reception of a long PUCCH.

[0492] Overview of devices to which the present invention is applicable

[0493] Figure 7 The block diagram shows a wireless communication device to which the method proposed in this specification can be applied.

[0494] Reference Figure 7 , a wireless communication system includes a base station 710 and a plurality of user equipments 720 located within the area of ​​the base station.

[0495] Each of the BS and the UE may be represented as a wireless device.

[0496] The BS 710 includes a processor 711 , a memory 712 , and a radio frequency (RF) module 713 .

[0497] Processor 711 is implemented in the above Figures 1 to 6 The functions, processes and / or methods proposed in the

[0498] The layers of the radio interface protocol may be implemented by the processor.

[0499] The memory is connected to the processor to store various pieces of information for driving the processor.

[0500] The RF module is connected to the processor to send and / or receive radio signals.

[0501] The UE includes a processor 721 , a memory 722 , and an RF module 723 .

[0502] The processor is implemented in the above Figures 1 to 6 The functions, processes and / or methods proposed in the

[0503] The layers of the radio interface protocol may be implemented by the processor.

[0504] The memory 722 is connected to the processor to store various pieces of information for driving the processor.

[0505] The RF module 723 is connected to the processor to transmit and / or receive radio signals.

[0506] The memories 712 and 722 may be disposed inside or outside the processors 711 and 721 and connected to the processors through various well-known means.

[0507] Additionally, a base station and / or a UE may have a single antenna or multiple antennas.

[0508] Figure 8A block diagram of a communication device according to an embodiment of the present invention is shown.

[0509] In particular, Figure 8 The above is more specifically shown Figure 7 Figure 1.

[0510] Reference Figure 8 , the UE may be configured to include a processor (or digital signal processor (DSP)) 810, an RF module (or RF unit) 835, a power management module 805, an antenna 840, a battery 855, a display 815, a keyboard 820, a memory 830, a subscriber identity module (SIM) card 825 (this component is optional), a speaker 845, and a microphone 850. The UE may also include a single antenna or multiple antennas.

[0511] Processor 810 is implemented in the above Figures 1 to 6 The functions, processes and / or methods proposed in the present invention may be implemented by a processor.

[0512] The memory 830 is connected to the processor and stores information related to the operation of the processor. The memory 830 may be provided inside or outside the processor and connected to the processor by various well-known means.

[0513] The user enters command information such as a phone number by, for example, pressing (or touching) a button on the keypad 820 or by voice activation using the microphone 850. The processor receives such command information and processes to perform appropriate functions including dialing a phone number. Operational data may be extracted from the SIM card 825 or the memory 830. In addition, the processor may display the command information or driving information on the display 815 for user identification and convenience.

[0514] The RF module 835 is connected to the processor to send and / or receive RF signals. The processor transmits command information to the RF module to initiate communication, for example, to send a radio signal constituting voice communication data. The RF module is composed of a receiver and a transmitter for receiving and sending radio signals. Antenna 840 is used to send and receive radio signals. When receiving a radio signal, the RF module can transmit the signal for processing by the processor and convert the signal to baseband. The processed signal can be converted into audible or readable information output via a speaker 845.

[0515] Fig. 9 is a diagram showing an example of an RF module of a wireless communication device to which the method proposed in this specification can be applied.

[0516] Specifically, Fig. 9 An example of an RF module that may be implemented in a frequency division duplex (FDD) system is shown.

[0517] First, in the transmission path, Figure 7 and Figure 8 The processor described in processes the data to be transmitted and provides an analog output signal to the transmitter 910.

[0518] Within the transmitter 910, the analog output signal is filtered by a low pass filter (LPF) 911 to remove images caused by the digital-to-analog conversion (ADC), upconverted from baseband to RF by an upconverter (mixer) 912, and amplified by a variable gain amplifier (VGA) 913, and the amplified signal is filtered by a filter 914, further amplified by a power amplifier (PA) 915, routed through a duplexer 950 / antenna switch 960, and transmitted via an antenna 970.

[0519] In addition, in a reception path, the antenna 970 receives a signal from the outside and provides a received signal that is routed through the antenna switch 960 / duplexer 950 and provided to the receiver 920 .

[0520] In the receiver 920 , the received signal is amplified by a low noise amplifier (LNA) 923 , filtered by a bandpass filter 924 , and downconverted from RF to baseband by a downconverter (mixer) 925 .

[0521] The down-converted signal is filtered by a low pass filter (LPF) 1426 and amplified by a VGA 927 to obtain an analog input signal, which is provided to Figure 7 and Figure 8 The processor described in .

[0522] Additionally, a local oscillator (LO) generator 940 also provides transmit and receive LO signals to upconverter 912 and downconverter 925, respectively.

[0523] Additionally, a phase locked loop (PLL) 930 receives control information from the processor in order to generate transmit and receive LO signals at appropriate frequencies and provides control signals to a LO generator 940 .

[0524] in addition, Fig. 9 The circuit shown in Fig. 9 The components illustrated in FIG. 1 are arranged differently.

[0525] Fig.10 is a diagram showing another example of an RF module of a wireless communication device to which the method proposed in this specification can be applied.

[0526] Specifically, Fig.10 An example of an RF module that may be implemented in a time division duplex (FDD) system is shown.

[0527] The transmitter 1010 and the receiver 1020 of the RF module in the TDD system are identical in structure to the transmitter and the receiver of the RF module in the FDD system.

[0528] Hereinafter, only the structure of the RF module of the TDD system which is different from the RF module of the FDD system will be described, and the same structure will be referred to in the foregoing description. Fig. 9 Description.

[0529] The signal amplified by the power amplifier (PA) 1015 of the transmitter is routed through a band selection switch 1050 , a band pass filter (BPF) 1560 , and an antenna switch 1070 , and is transmitted via an antenna 1080 .

[0530] In addition, in a reception path, the antenna 1080 receives a signal from the outside and provides a received signal that is routed through the antenna switch 1070 , the band pass filter 1060 , and the band selection switch 1050 and provided to the receiver 1020 .

[0531] In the above-mentioned embodiments, the components and features of the present invention are combined in a predetermined form. Unless otherwise clearly stated, each component or feature should be considered as a selection. Each component or feature may be implemented without being associated with other components or features. In addition, the embodiments of the present invention may be configured by associating some components and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of any embodiment may be included in another embodiment, or replaced by components and features corresponding to another embodiment. It is obvious that claims that are not explicitly cited in the claims are combined to form embodiments or included in new claims by modification after application.

[0532] The embodiments of the present invention can be implemented by hardware, firmware, software or a combination thereof. In the case of being implemented by hardware, according to the hardware implementation, the exemplary embodiments described herein can be implemented by using one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, etc.

[0533] In the case of implementation by firmware or software, the embodiments of the present invention may be implemented in the form of modules, procedures, functions, etc. to perform the above functions or operations. The software code may be stored in a memory and executed by a processor. The memory may be located inside or outside the processor and may send and receive data to / from the processor through various devices.

[0534] It will be apparent to those skilled in the art that the present invention may be implemented in other specific forms without departing from the essential features of the present invention. Therefore, the foregoing detailed description should not be interpreted as limiting in any respect and should be considered illustratively. The scope of the present invention should be determined by the reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included within the scope of the present invention.

[0535] Industrial Applicability

[0536] An example applied to the 3GPP LTE / LTE-A system and the 5G system (new RAT system) is mainly described, but the RRC connection method can also be applied to various wireless communication systems other than the 3GPP LTE / LTE-A / NR system.

Claims

1. A method for receiving a long physical uplink control channel (PUCCH) on a plurality of time slots by a base station in a wireless communication system, the method comprising the following steps: Sending first information about time division duplex TDD uplink UL-downlink DL time slot configuration to user equipment UE; sending second information to the UE, the second information comprising a first parameter regarding the number of time slots used for transmission of the long PUCCH and a second parameter regarding the number of symbols in a time slot used for the transmission of the long PUCCH; as well as receiving the long PUCCH from the UE on the plurality of time slots determined by the UE based on the first information and the second information, Wherein, the long PUCCH is received based on an orthogonal code, The second information further includes a third parameter regarding the length of the orthogonal code of the long PUCCH. Wherein, the length of the orthogonal code is 2 or 4, Wherein, the length based on the orthogonal code is 2: Orthogonal code index 0 corresponds to cyclic shift CS index 0, and Orthogonal code index 1 corresponds to CS index 6, and Wherein, the length based on the orthogonal code is 4: Orthogonal code index 0 corresponds to CS index 0, and Orthogonal code index 3 corresponds to CS index 9, wherein, based on the number of symbols available for the transmission of the long PUCCH in a time slot being smaller than the number of symbols according to the second parameter, the long PUCCH is not received in the time slot, wherein the long PUCCH is received based on inter-slot frequency hopping, The inter-slot frequency hopping is performed for each of the multiple time slots based on the first frequency resource and the second frequency resource, regardless of whether the long PUCCH is received in the time slot among the multiple time slots.

2. The method according to claim 1, wherein: The plurality of time slots is determined as a specific number of time slots from the configured start time slot.

3. The method according to claim 2, wherein: The specific number of slots consists of UL symbols or unknown symbols.

4. The method according to claim 1, further comprising the steps of: A slot format indicator SFI for providing notification of a specific TDD UL-DL slot format is sent to the UE.

5. A base station configured to receive a long physical uplink control channel (PUCCH) over a plurality of time slots in a wireless communication system, the base station comprising: at least one transceiver for transmitting and receiving radio signals; as well as at least one processor, the at least one processor being functionally connected to the at least one transceiver, wherein the at least one processor is configured to: Sending first information about time division duplex TDD uplink UL-downlink DL time slot configuration to user equipment UE; sending second information to the UE, the second information comprising a first parameter regarding the number of time slots used for transmission of the long PUCCH and a second parameter regarding the number of symbols in a time slot used for the transmission of the long PUCCH; and receiving the long PUCCH from the UE on the plurality of time slots determined by the UE based on the first information and the second information, Wherein, the long PUCCH is received based on an orthogonal code, The second information further includes a third parameter regarding the length of the orthogonal code of the long PUCCH, wherein the length of the orthogonal code is 2 or 4, Wherein, the length based on the orthogonal code is 2: Orthogonal code index 0 corresponds to cyclic shift CS index 0, and Orthogonal code index 1 corresponds to CS index 6, and Wherein, the length based on the orthogonal code is 4: Orthogonal code index 0 corresponds to CS index 0, and Orthogonal code index 3 corresponds to CS index 9, wherein, based on the number of symbols available for the transmission of the long PUCCH in a time slot being smaller than the number of symbols according to the second parameter, the long PUCCH is not received in the time slot, wherein the long PUCCH is received based on inter-slot frequency hopping, The inter-slot frequency hopping is performed for each of the multiple time slots based on the first frequency resource and the second frequency resource, regardless of whether the long PUCCH is received in the time slot among the multiple time slots.

6. The base station according to claim 5, wherein: The plurality of time slots is determined as a specific number of time slots from the configured start time slot.

7. The base station according to claim 6, wherein: The specific number of slots consists of UL symbols or unknown symbols.

8. The base station according to claim 6, in, The at least one processor is configured to send a slot format indicator (SFI) to the UE for providing notification of a specific TDD UL-DL slot format.

9. At least one computer-readable medium storing instructions, the instructions being executed by at least one processor to perform operations comprising: receiving first information about time division duplex (TDD) uplink (UL)-downlink (DL) time slot configuration from a base station; receiving second information from the base station, the second information comprising a first parameter regarding the number of time slots used for transmission of a long PUCCH and a second parameter regarding the number of symbols in a time slot used for the transmission of the long PUCCH; Determine a plurality of time slots for sending the long PUCCH based on the first information and the second information; as well as sending the long PUCCH to the base station over the multiple time slots, Wherein, the long PUCCH is sent based on an orthogonal code. The second information further includes a third parameter regarding the length of the orthogonal code of the long PUCCH. Wherein, the length of the orthogonal code is 2 or 4, Wherein, the length based on the orthogonal code is 2: Orthogonal code index 0 corresponds to cyclic shift CS index 0, and Orthogonal code index 1 corresponds to CS index 6, and Wherein, the length based on the orthogonal code is 4: Orthogonal code index 0 corresponds to CS index 0, and Orthogonal code index 3 corresponds to CS index 9, wherein, based on the number of symbols available for the transmission of the long PUCCH in a time slot being smaller than the number of symbols according to the second parameter, the long PUCCH is not sent in the time slot, wherein the long PUCCH is sent based on inter-slot frequency hopping, The inter-slot frequency hopping is performed for each of the multiple time slots based on the first frequency resource and the second frequency resource, regardless of whether the long PUCCH is transmitted in the time slot among the multiple time slots.

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