Method and device for sending and receiving physical downlink shared channel in wireless communication system

Abstract

The present disclosure discloses a method and device for transmitting and receiving a physical downlink shared channel (PDSCH) in a wireless communication system. Specifically, a method for a user equipment (UE) to receive a PDSCH in a wireless communication system includes the steps of: receiving configuration information for a PDSCH, the configuration information including a plurality of TCI state configurations; receiving activation information, the plurality of TCI state configurations being activated by the activation information, and the activation information including mapping information about the activated TCI state configuration and the code point of a transmission configuration indication (TCI) field in the downlink control information; receiving a DCI including a TCI field; and receiving a plurality of PDSCH transmission opportunities based on an indication of a specific code point mapped to a plurality of TCI states through the TCI field, wherein the plurality of PDSCH transmission opportunities correspond to the same transport block, the plurality of PDSCH transmission opportunities are received in a time domain resource based on time division multiplexing (TDM), and the number of the plurality of PDSCH transmission opportunities can be determined based on the number of TCI states mapped to a specific code point.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method for transmitting and receiving a physical downlink shared channel based on a plurality of transmit reception points (TRPs) and a device for supporting the method. Background Art

[0002] Mobile communication systems have been developed to ensure user activity while providing voice services. Mobile communication systems are expanding their services from voice only to data. The current soaring data traffic is exhausting resources, and user demand for higher data rate services has led to the need for more advanced mobile communication systems.

[0003] The next generation of mobile communication systems needs to meet requirements such as handling explosively increasing data traffic, significantly increasing the transmission rate per user, working with a large number of connected devices, and supporting very low end-to-end latency and high energy efficiency. To this end, various research efforts are being conducted on various technologies such as dual connectivity, massive multiple-input multiple-output (MIMO), in-band full-duplex, non-orthogonal multiple access (NOMA), ultra-wideband support, and device networking. Summary of the invention

[0004] Technical issues

[0005] The present disclosure proposes a method for a UE supported by multiple Transmission Reception Points (TRPs) to receive a physical downlink shared channel in a wireless communication system.

[0006] Specifically, the present disclosure proposes a method for configuring multiple TRPs to perform a collaborative transmission scheme (e.g., eMBB operation or URLLC operation).

[0007] In addition, the present disclosure proposes a method for configuring a specific scheme among various schemes related to URLLC M-TRP operations.

[0008] Furthermore, the present disclosure proposes a method for configuring the number of times a transmission opportunity corresponding to the same transport block is repeatedly transmitted by considering a TDM-based URLLC M-TRP operation.

[0009] Furthermore, the present disclosure proposes a method for configuring resources of a time domain for repeatedly transmitting transmission opportunities corresponding to the same transport block by considering TDM-based URLLC M-TRP operation.

[0010] Furthermore, the present disclosure proposes a method for configuring a field of DCI (eg, a TCI field) by considering an M-TRP operation.

[0011] The technical problems to be solved by the present disclosure are not limited to the above-mentioned technical problems, and those skilled in the art to which the present disclosure belongs can clearly understand other technical problems not mentioned above from the following description.

[0012] Technical Solution

[0013] In the present disclosure, a method for receiving a physical downlink shared channel (PDSCH) by a user equipment (UE) in a wireless communication system, the method comprising: receiving configuration information for the PDSCH, wherein the configuration information comprises a plurality of TCI state configurations; receiving activation information, wherein some of the plurality of TCI state configurations are activated based on the activation information, and wherein the activation information comprises mapping information between code points of a transmission configuration indication (TCI) field in downlink control information (DCI) and the activated TCI state configurations; receiving a DCI comprising the TCI field; and receiving a plurality of PDSCH transmission opportunities based on a specific code point mapped to a plurality of TCI states indicated by the TCI field, wherein the plurality of PDSCH transmission opportunities correspond to the same transport block, wherein the plurality of PDSCH transmission opportunities are received in a time domain resource based on time division multiplexing (TDM), and wherein the number of the plurality of PDSCH transmission opportunities is determined based on the number of TCI states mapped to the specific code point.

[0014] In addition, in the present disclosure, based on the specific code point, a first TCI state and a second TCI state are indicated, wherein the first TCI state corresponds to a first PDSCH transmission timing, and the second TCI state corresponds to a second PDSCH transmission timing.

[0015] Furthermore, in the present disclosure, each PDSCH transmission opportunity consists of 2, 4 or 7 OFDM symbols.

[0016] Furthermore, in the present disclosure, wherein the first PDSCH transmission opportunity and the second PDSCH transmission opportunity are received in one time slot.

[0017] Furthermore, in the present disclosure, wherein the DCI further includes a Redundancy Version (RV) field, and wherein based on the RV field, an RV value of the first PDSCH transmission opportunity and an RV value of the second PDSCH transmission opportunity are set differently.

[0018] Furthermore, in the present disclosure, the configuration information includes information related to the number of the plurality of PDSCH transmission opportunities.

[0019] Furthermore, in the present disclosure, each PDSCH transmission opportunity is time-division multiplexed as a unit of a time slot.

[0020] Furthermore, in the present disclosure, candidate values ​​of the number of the plurality of PDSCH transmission opportunities are indicated based on the configuration information, wherein one of the candidate values ​​is configured based on the DCI.

[0021] Furthermore, in the present disclosure, the DCI further includes a time domain resource allocation field, wherein the first time domain resource of the first PDSCH transmission opportunity is indicated based on the time domain resource allocation field.

[0022] Furthermore, in the present disclosure, the size of the second time domain resource of the second PDSCH transmission opportunity is the same as the size of the first time domain resource.

[0023] Furthermore, in the present disclosure, the first time domain resource and the second time domain resource are adjacent to each other.

[0024] Furthermore, in the present disclosure, the first symbol of the second time domain resource is positioned a specific number of symbols away from the last symbol of the first time domain resource.

[0025] Furthermore, in the present disclosure, the specific number of symbols is received through higher layer signaling.

[0026] In addition, in the present disclosure, it further includes: receiving information about a transmission scheme (scheme) of the PDSCH.

[0027] In addition, in the present disclosure, a user equipment (UE) for receiving a physical downlink shared channel (PDSCH) in a wireless communication system includes: one or more transceivers; one or more processors; and one or more memories, the one or more memories being used to store instructions for operations performed by the one or more processors and coupled to the one or more processors; wherein the operations include: receiving configuration information for the PDSCH, wherein the configuration information includes multiple TCI state configurations; receiving activation information, wherein some of the multiple TCI state configurations are activated based on the activation information, and wherein the activation information includes mapping information between code points of a transmission configuration indication (TCI) field in downlink control information (DCI) and the activated TCI state configuration; receiving DCI including the TCI field; and receiving multiple PDSCH transmission opportunities based on specific code points mapped to multiple TCI states indicated by the TCI field, wherein the multiple PDSCH transmission opportunities correspond to the same transport block, wherein the multiple PDSCH transmission opportunities are received in time domain resources based on time division multiplexing (TDM), and wherein the number of the multiple PDSCH transmission opportunities is determined based on the number of TCI states mapped to the specific code point.

[0028] In addition, in the present disclosure, a method for sending a physical downlink shared channel (PDSCH) by a base station in a wireless communication system, the method comprising: sending configuration information for the PDSCH to a user equipment (UE), wherein the configuration information includes multiple TCI state configurations; sending activation information to the UE, wherein some TCI state configurations of the multiple TCI state configurations are activated based on the activation information, and wherein the activation information includes mapping information between code points of a transmission configuration indication (TCI) field in downlink control information (DCI) and the activated TCI state configuration; sending a DCI including the TCI field to the UE; and sending multiple PDSCH transmission opportunities to the UE based on a specific code point mapped to multiple TCI states indicated by the TCI field, wherein the multiple PDSCH transmission opportunities correspond to the same transport block, wherein the multiple PDSCH transmission opportunities are received in a time domain resource based on time division multiplexing (TDM), and wherein the number of the multiple PDSCH transmission opportunities is determined based on the number of TCI states mapped to the specific code point.

[0029] In addition, in the present disclosure, a base station for transmitting a physical downlink shared channel (PDSCH) in a wireless communication system, the base station comprising: one or more transceivers; one or more processors; and one or more memories, the one or more memories being used to store instructions for operations performed by the one or more processors and being coupled to the one or more processors; wherein the operations comprise: sending configuration information for the PDSCH to a user equipment (UE), wherein the configuration information comprises a plurality of TCI state configurations; sending activation information to the UE, wherein some of the plurality of TCI state configurations are activated based on the activation information, and wherein the activation information includes mapping information between a code point of a transmission configuration indication (TCI) field in downlink control information (DCI) and an activated TCI state configuration; sending DCI including the TCI field to the UE; and sending multiple PDSCH transmission opportunities to the UE based on a specific code point mapped to multiple TCI states indicated by the TCI field, wherein the multiple PDSCH transmission opportunities correspond to the same transport block, wherein the multiple PDSCH transmission opportunities are received in time domain resources based on time division multiplexing (TDM), and wherein the number of the multiple PDSCH transmission opportunities is determined based on the number of TCI states mapped to the specific code point.

[0030] In addition, in the present disclosure, a device includes one or more memories and one or more processors operably coupled to the one or more memories, the device including: wherein the one or more processors control the device to: receive configuration information for the PDSCH, wherein the configuration information includes multiple TCI state configurations; receive activation information, wherein some TCI state configurations of the multiple TCI state configurations are activated based on the activation information, and wherein the activation information includes mapping information between the code point of the transmission configuration indication (TCI) field in the downlink control information (DCI) and the activated TCI state configuration; receive the DCI including the TCI field; and based on the specific code point mapped to the multiple TCI states indicated by the TCI field, receive multiple PDSCH transmission opportunities, wherein the multiple PDSCH transmission opportunities correspond to the same transport block, wherein the multiple PDSCH transmission opportunities are received in time domain resources based on time division multiplexing (TDM), and wherein the number of the multiple PDSCH transmission opportunities is determined based on the number of TCI states mapped to the specific code point.

[0031] In addition, in the present disclosure, one or more non-transitory computer-readable media storing one or more instructions, the one or more instructions executable by one or more processors include: instructions for instructing a user equipment (UE) to perform the following operations: receiving configuration information for the PDSCH, wherein the configuration information includes multiple TCI state configurations; receiving activation information, wherein some TCI state configurations of the multiple TCI state configurations are activated based on the activation information, and wherein the activation information includes mapping information between the code point of the transmission configuration indication (TCI) field in the downlink control information (DCI) and the activated TCI state configuration; receiving the DCI including the TCI field; and receiving multiple PDSCH transmission opportunities based on a specific code point mapped to multiple TCI states indicated by the TCI field, wherein the multiple PDSCH transmission opportunities correspond to the same transport block, wherein the multiple PDSCH transmission opportunities are received in time domain resources based on time division multiplexing (TDM), and wherein the number of the multiple PDSCH transmission opportunities is determined based on the number of TCI states mapped to the specific code point.

[0032] Beneficial Effects

[0033] According to an embodiment of the present disclosure, multiple TRP operation schemes can be configured for the UE, and the UE can perform operations corresponding thereto.

[0034] Furthermore, according to an embodiment of the present disclosure, the number of transmission opportunities (the number of repetitions of transmission opportunities) corresponding to the same transport block in TDM-based M-TRP URLLC transmission may be configured.

[0035] In addition, according to an embodiment of the present disclosure, a shift symbol and / or an RV value may be configured for each transmission opportunity.

[0036] Furthermore, according to an embodiment of the present disclosure, a resource region for receiving transmission opportunities corresponding to the same transport block in TDM-based M-TRP URLLC transmission may be determined.

[0037] In addition, according to an embodiment of the present disclosure, the regular DCI field may be configured or interpreted to be suitable for M-TRP operation.

[0038] Effects obtainable from the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned above can be clearly understood by those skilled in the art to which the present disclosure belongs from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings, which are included to provide a further understanding of the disclosure and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

[0040] Figure 1 is a diagram illustrating an example of an overall system structure of a NR to which the method proposed in the present disclosure can be applied.

[0041] Figure 2 The diagram illustrates the relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present disclosure can be applied.

[0042] Figure 3 An example of a frame structure in an NR system is illustrated.

[0043] Figure 4 An example of a resource grid supported by a wireless communication system to which the method proposed in the present disclosure can be applied is illustrated.

[0044] Figure 5 An example of a resource grid for each antenna port and parameter set to which the method proposed in the present disclosure can be applied is illustrated.

[0045] Figure 6 The physical channels and general signaling are illustrated.

[0046] Figure 7 An example of downlink transmission / reception operation is illustrated.

[0047] Figure 8 An example of uplink transmission / reception operation is illustrated.

[0048] Fig. 9 is a flow chart illustrating an example of a DL DMRS procedure.

[0049] Fig.10 The diagram illustrates a transmission and reception method for reliability improvement supported by multiple TRPs, and the following two methods can be considered.

[0050] Fig.11 An example of the configuration of shifted symbols between transmission opportunities is illustrated.

[0051] Fig.12 This figure shows an example of transmission timing that is repeatedly transmitted in one time slot.

[0052] Fig.13 An example of resource allocation for repeated transmission in the time domain proposed in the present disclosure is illustrated.

[0053] Fig.14 An example of repeated transmission in time slot units based on a transmission timing structure defined in a first time slot is illustrated in order to prevent repeated transmission by more than one time slot.

[0054] Fig.15 An example of resource allocation for transmission opportunities beyond the time slot boundary according to the method proposed in this disclosure is illustrated.

[0055] Fig.16 An example of a time domain resource allocation method to which the method proposed in the present disclosure can be applied when a transmission opportunity exceeding a time slot boundary occurs is illustrated.

[0056] Fig.17 The figure shows an example of applying the DMRS pattern to a transmission opportunity of repeated transmission.

[0057] Fig.18 The diagram illustrates an example of a signaling process for performing data transmission and reception between a network side and a UE in the case of multiple TPs, to which the method and / or embodiments proposed in the present disclosure can be applied.

[0058] Fig.19 An example of an operation flow chart of a UE performing data transmission and reception to which the methods and / or embodiments proposed in the present disclosure may be applied is illustrated.

[0059] Fig. 20 An example of an operation flow chart of a BS performing data transmission and reception to which the methods and / or embodiments proposed in the present disclosure may be applied is illustrated.

[0060] Fig.21 The diagram shows a communication system (1) applied to the present disclosure.

[0061] Fig. 22 The illustration may be applied to the wireless device of the present disclosure.

[0062] Fig.23 The diagram shows the signal processing circuit used to transmit the signal.

[0063] Fig.24 Another example of a wireless device to which the present disclosure is applied is illustrated.

[0064] Fig.25 The diagram shows a portable device to which the present disclosure is applied. DETAILED DESCRIPTION

[0065] Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Figure 1 The detailed description disclosed above is intended to describe exemplary embodiments of the present disclosure, rather than to describe the only embodiment for performing the present disclosure. The following detailed description includes details to provide a complete understanding of the present disclosure. However, those skilled in the art will appreciate that the present disclosure may be performed without the details.

[0066] In some cases, in order to prevent the concepts of the present disclosure from being unclear, known structures and devices may be omitted or illustrated in the form of block diagrams based on the core functions of each structure and device.

[0067] In the following, downlink (DL) refers to communication from a base station to a terminal, and uplink (UL) refers to communication from a terminal to a base station. In the downlink, the transmitter may be part of a base station, and the receiver may be part of a terminal. In the uplink, the transmitter may be part of a terminal, and the receiver may be part of a base station. The base station may be expressed as a first communication device, and the terminal may be expressed as a second communication device. The following terms may be used instead of a base station (BS), including: fixed station, Node B (Node B), evolved Node B (eNB), next generation Node B (gNB), base transceiver system (BTS), access point (AP), network (5G network), AI system, roadside unit (RSU), vehicle, robot, unmanned aerial vehicle (UAV), AR (augmented reality) device, VR (virtual reality) device, and the like. In addition, the terminal may be fixed or mobile and may be replaced by the following terms, including: user equipment (UE), mobile station (MS), user terminal (UT), mobile subscriber station (MSS), subscriber station (SS), advanced mobile station (AMS), wireless terminal (WT), machine type communication (MTC) device, machine-to-machine (M2M) device and device-to-device (D2D) device, vehicle, robot, AI module, unmanned aerial vehicle (UAV), AR (augmented reality) device, VR (virtual reality) device, etc.

[0068] The following techniques may be used in various radio access systems including CDMA, FDMA, TDMA, OFDMA, SC-FDMA, etc. CDMA may be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented as a radio technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rate for GSM Evolution (EDGE). OFDMA may be implemented as a radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. UTRA is part of Universal Mobile Telecommunications System (UMTS). The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA, and Advanced LTE (A) / LTE-A pro is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0069] For the sake of clarity of description, the technical spirit of the present disclosure is described based on a 3GPP communication system (e.g., LTE-A or NR), but the technical spirit of the present disclosure is not limited thereto. LTE refers to the technology after 3GPP TS 36.xxx version 8. In detail, the LTE technology after 3GPP TS 36.xxx version 10 is called LTE-A, and the LTE technology after 3GPP TS 36.xxx version 13 is called LTE-A pro. 3GPP NR refers to the technology after TS 38.xxx version 15. LTE / NR can be referred to as a 3GPP system. "xxx" refers to the detailed number of the standard document. Matters disclosed in the standard documents opened in the present disclosure can be cited for the background technology, terms, abbreviations, etc. used to describe the present disclosure. For example, the following documents can be referenced.

[0070] 3GPP LTE

[0071] -36.211: Physical channels and modulation

[0072] -36.212: Multiplexing and channel coding

[0073] -36.213: Physical layer procedures

[0074] -36.300: General description

[0075] -36.331: Radio Resource Control (RRC)

[0076] 3GPP NR

[0077] -38.211: Physical channels and modulation

[0078] -38.212: Multiplexing and channel coding

[0079] -38.213: Physical layer procedures for control

[0080] -38.214: Physical layer procedures for data

[0081] -38.300: NR and NG-RAN general description

[0082] -36.331: Radio Resource Control (RRC) protocol specification

[0083] As more and more communication devices require greater communication capacity, there is a need for improved mobile broadband communications compared to existing radio access technologies (RATs). In addition, large-scale machine type communications (MTC), which provide various services anytime and anywhere by connecting many devices and objects, is one of the main issues to be considered in next-generation communications. In addition, the design of communication systems considering services / UEs that are sensitive to reliability and latency is being discussed. The introduction of next-generation radio access technologies considering enhanced mobile broadband communications (eMBB), massive MTC (mMTC), and ultra-reliable low-latency communications (URLLC) is discussed, and in this disclosure, for convenience, the technology is referred to as a new RAT. NR is an expression representing an example of a 5G radio access technology (RAT).

[0084] The three main demand areas of 5G include: (1) enhanced mobile broadband (eMBB), (2) massive machine type communication (mMTC), and (3) ultra-reliable low-latency communication (URLLC).

[0085] Some use cases may require optimization of multiple areas, while others may focus on just one key performance indicator (KPI). 5G supports a variety of use cases in a flexible and reliable manner.

[0086] eMBB goes far beyond basic mobile Internet access and covers a large number of two-way tasks, media and entertainment applications in the cloud or augmented reality. Data is one of the main drivers of 5G, and dedicated voice services may not appear in the 5G era for the first time. In 5G, it is expected that voice will be processed as an application using a data connection simply provided by the communication system. The main reasons for the increase in traffic include the increase in content size and the increase in the number of applications that require high data transfer rates. As more and more devices are connected to the Internet, streaming services (audio and video), conversational video and mobile Internet connections will be more widely used. So many applications require always-on connections to push real-time information and notifications to users. Cloud storage and applications have suddenly increased in mobile communication platforms, and this can be applied to both business and entertainment. In addition, cloud storage is a special use case that drives the growth of uplink data transfer rates. 5G is also used for remote services in the cloud. When using tactile interfaces, lower end-to-end latency is required to maintain an excellent user experience. Entertainment, for example, cloud gaming and video streaming are other key elements that increase the demand for mobile broadband capabilities. Entertainment is essential in smartphones and tablets anywhere in high mobility environments including trains, vehicles and airplanes. Another use case is augmented reality and information search for entertainment. In this case, augmented reality requires extremely low latency and instant data volume.

[0087] Furthermore, one of the most anticipated 5G use cases involves a capability that smoothly connects embedded sensors in all areas, namely mMTC. By 2020, it is expected that the potential number of Internet of Things (IoT) devices will reach 20.4 billion. Industrial IoT is one of the areas where 5G will play a major role, enabling smart cities, asset tracking, smart utilities, agriculture, and security infrastructure.

[0088] URLLC includes a new service that will transform industries through remote control of critical infrastructure and ultra-high reliability / low availability latency links, such as autonomous vehicles. The level of reliability and latency is critical for smart grid control, industrial automation, robotics, drone control and regulation.

[0089] Describe multiple use cases in more detail.

[0090] 5G can complement fiber to the home (FTTH) and cable-based broadband (or DOCSIS) as a means of delivering streams rated from gigabits per second to hundreds of megabits per second. Such fast speeds are also necessary for delivering television with a resolution of 4K or higher (6K, 8K or higher), in addition to virtual reality and augmented reality. Virtual reality (VR) and augmented reality (AR) applications include immersive sports gaming. Specific applications may require special network configurations. For example, in the case of VR gaming, in order for gaming companies to minimize latency, it may be necessary to integrate the core server with the network operator's edge network server.

[0091] Along with the numerous use cases for automotive mobile communications, cars are expected to be an important and new driver of 5G. For example, the entertainment of passengers requires both high-capacity and high-mobility mobile broadband. The reason for this is that users in the future will continue to expect high-quality connections regardless of their location and speed. Another example of use in the automotive field is an augmented reality dashboard. The augmented reality dashboard overlays and displays information on what the driver sees through the front window, identifies objects in the dark, and informs the driver of the distance and movement of the object. In the future, wireless modules will enable communication between cars, information exchange between cars and supporting infrastructure, and information exchange between cars and other connected devices (e.g., those accompanying pedestrians). Safety systems guide the course of action available so that drivers can drive more safely, reducing the risk of accidents. The next step will be remotely controlled or autonomous vehicles. This requires very reliable and very fast communication between different autonomous vehicles and between cars and infrastructure. In the future, autonomous vehicles may perform all driving activities, and the driver will focus on things outside of traffic that the car itself cannot recognize. The technical requirements of autonomous vehicles require ultra-low latency and ultra-high-speed reliability, which increases traffic safety to a level that humans cannot achieve.

[0092] The smart cities and smart homes mentioned in the smart society will be embedded as high-density radio sensor networks. Distributed networks of smart sensors will identify the cost of cities or homes and the status of energy-saving maintenance. Similar configurations can be performed for each home. All temperature sensors, window and heating controllers, burglar alarms and household appliances are wirelessly connected. Many of these sensors are usually low data transmission rate, low power consumption and low cost. However, for example, a specific type of surveillance equipment may require real-time high-definition video.

[0093] The consumption and distribution of energy, including heat or gas, is highly decentralized and therefore requires automated control of a distributed sensor network. Smart grids collect information and interconnect these sensors using digital information and communication technologies so that the sensors act based on the information. This information can include the behavior of suppliers and consumers, and thus smart grids can improve the distribution of fuels such as electricity in an efficient, reliable, economical, sustainable and automated manner. Smart grids can be considered as another sensor network with small latency.

[0094] The health sector has many applications that benefit from mobile communications. Communication systems can support telemedicine, which provides clinical treatment in distant locations. This helps reduce the barrier of distance and can improve access to discontinuous medical services in remote agricultural areas. Furthermore, this can be used to save lives during critical treatments and emergencies. Radio sensor networks based on mobile communications can provide remote monitoring and sensors for parameters such as heart rate and blood pressure.

[0095] Radio and mobile communications are becoming increasingly important in industrial applications. Cabling requires high installation and maintenance costs. Therefore, the possibility of replacing cables by reconfigurable radio links is an attractive opportunity in many industrial fields. However, in order to realize this possibility, radio connections are required to operate with latency, reliability and capacity similar to cables, and management is simplified. Low latency and low error probability are new requirements for connecting 5G.

[0096] Logistics and freight tracking are important use cases for mobile communications, which enable tracking of inventory and packages anywhere using location-based information systems. Logistics and freight tracking use cases typically require lower data speeds, but require wide areas and reliable location information.

[0097] In the new RAT system including NR, an OFDM transmission scheme or a transmission scheme similar thereto is used. The new RAT system may follow OFDM parameters different from those of LTE. Alternatively, the new RAT system may follow the parameter set of conventional LTE / LTE-A as is or have a larger system bandwidth (e.g., 100 MHz). Alternatively, one cell may support multiple parameter sets. In other words, UEs operating with different parameter sets may coexist in one cell.

[0098] A parameter set corresponds to one subcarrier spacing in the frequency domain. Different parameter sets can be defined by scaling the reference subcarrier spacing to an integer N.

[0099] Definition of terms

[0100] eLTE eNB: eLTE eNB is the evolution of eNB that supports connectivity to EPC and NGC.

[0101] gNB: A node that supports NR and connectivity to NGC.

[0102] New RAN: A radio access network that supports NR or E-UTRA or interfaces with NGC.

[0103] Network slicing: Network slicing refers to a network customized by an operator to provide optimized solutions for specific market scenarios with specific requirements within an end-to-end scope.

[0104] Network Function: A network function is a logical node in a network architecture that has a well-defined external interface and a well-defined functional behavior.

[0105] NG-C: The control plane interface used over the NG2 reference point between the New RAN and NGC.

[0106] NG-U: User plane interface used over the NG3 reference point between the New RAN and NGC.

[0107] Non-Standalone NR: A deployment configuration where the gNB requires an LTE eNB as an anchor for control plane connectivity to the EPC, or requires an eLTE eNB as an anchor for control plane connectivity to the NGC.

[0108] Non-Standalone E-UTRA: A deployment configuration where the eLTE eNB requires the gNB as the anchor for control plane connectivity to the NGC.

[0109] User plane gateway: the termination point of the NG-U interface.

[0110] System Overview

[0111] Figure 1 An example of the overall structure of an NR system to which the method proposed in the present disclosure can be applied is illustrated.

[0112] refer to Figure 1 NG-RAN is composed of gNB, which provides NG-RA user plane (new AS sublayer / PDCP / RLC / MAC / PHY) and control plane (RRC) protocol ends for user equipment (UE).

[0113] The gNBs are interconnected via the Xn interface.

[0114] The gNB is also connected to the NGC via the NG interface.

[0115] 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.

[0116] New RAT (NR) parameter set and frame structure

[0117] 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 at very high subcarrier frequencies, the parameter set to be used can be selected independently of the frequency band.

[0118] In addition, in the NR system, multiple frame structures based on multiple parameter sets can be supported.

[0119] Hereinafter, an Orthogonal Frequency Division Multiplexing (OFDM) parameter set and a frame structure that can be considered in the NR system will be described.

[0120] Multiple OFDM parameter sets supported in the NR system can be defined as shown in Table 1.

[0121] [Table 1]

[0122] μ <![CDATA[Δf=2 μ ·15[kHz]]]> Cyclic prefix 0 15 Normal 1 30 Normal 2 60 Normal, extended 3 120 Normal 4 240 Normal

[0123] NR supports multiple parameter sets (or subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15kHz, it supports wide areas in the traditional cellular band; when the SCS is 30kHz / 60kHz, it supports dense cities, lower latency and wider carrier bandwidth; and when the SCS is 60kHz or higher, it supports bandwidth greater than 24.25GHz to overcome phase noise.

[0124] The NR band is defined as two types of frequency ranges (FR1 and FR2). FR1 and FR2 can be configured as shown in the following Table 2. In addition, FR2 may mean millimeter wave (mmW).

[0125] [Table 2]

[0126] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 410MHz–7125MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0127] Regarding the frame structure in the NR system, the size of each field in the time domain is expressed 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 = A portion of a radio frame of 10 ms. A radio frame consists of ten subframes, each with T sf =(Δf max N f / 1000)·T s = a portion of 1 ms. In this case, there may be a UL frame set and a DL frame set.

[0128] Figure 2 The diagram illustrates a relationship between an uplink frame and a downlink frame in a wireless communication system to which the method proposed in the present disclosure is applicable.

[0129] like Figure 2 As illustrated in FIG. 1 , an uplink frame number i for transmission from a user equipment (UE) should start T before the start of the corresponding downlink frame at the corresponding UE. TA =N TA T s .

[0130] Regarding parameter set μ, the slots are in ascending order within a subframe. Numbered and in ascending order within a radio frame A time slot consists of Consecutive OFDM symbols, and Determined by the parameter set and time slot configuration used. Time slot in a subframe The beginning of the OFDM symbol in the same subframe The start of is aligned in time.

[0131] Not all UEs are capable of transmitting and receiving at the same time, and this means that not all OFDM symbols in a downlink time slot or an uplink time slot may be used.

[0132] Table 3 shows the number of OFDM symbols per time slot in a normal CP Number of slots per radio frame and the number of time slots per subframe Table 4 shows the number of OFDM symbols per slot in the extended CP, the number of slots per radio frame, and the number of slots per subframe.

[0133] [Table 3]

[0134]

[0135] [Table 4]

[0136]

[0137] Figure 3 An example of a frame structure in an NR system is illustrated. Figure 3 It is only for the convenience of explanation and does not limit the scope of the present disclosure.

[0138] In Table 4, in the case of μ=2, that is, as an example of a subcarrier spacing (SCS) of 60 kHz, referring to Table 3, one subframe (or frame) may include four time slots, and Figure 3 One subframe = {1, 2, 4} slots as shown in , for example, the number of slots that can be included in one subframe is defined as in Table 3.

[0139] Furthermore, a mini-slot may consist of 2, 4, or 7 symbols, or may consist of more or fewer symbols.

[0140] Regarding the physical resources in the NR system, we can consider antenna ports, resource grids, resource elements, resource blocks, carrier parts, etc.

[0141] In the following, the above-mentioned physical resources that can be considered in the NR system are described in more detail.

[0142] First, with respect to antenna ports, the antenna ports are defined so that the channel on which the symbol of the antenna port can be transmitted can be inferred from the channel on which another symbol on the same antenna port is transmitted. When the large-scale properties of the channel on which the symbol on one antenna port is transmitted can be inferred from the channel on which the symbol on another antenna port is transmitted, the two antenna ports can be regarded as a quasi-co-located or quasi-co-located (QC / QCL) relationship. In this case, the large-scale properties include at least one of the following: delay spread, Doppler spread, frequency shift, average received power, and receive timing.

[0143] Figure 4 An example of a resource grid supported in a wireless communication system to which the method proposed in the present disclosure is applicable is illustrated.

[0144] refer to Figure 4 , the resource grid is composed of subcarriers, each subframe consists of 14·2 μ OFDM symbols, but the present disclosure is not limited thereto.

[0145] In the NR system, the transmitted signal is described by one or more resource grids. subcarriers and OFDM symbols, where Indicates the maximum transmission bandwidth and can change not only between parameter sets, but also between uplink and downlink.

[0146] In this case, if Figure 5 As illustrated in , each parameter set μ and antenna port p can configure a resource grid.

[0147] Figure 5 An example of a resource grid for each antenna port and parameter set to which the method proposed in the present disclosure is applicable is illustrated.

[0148] Each element of the resource grid for a parameter set μ and an antenna port p is called a resource element and is referenced by an index Unique identifier, where is an index in the frequency domain, and The index pair (k, l) is used to reference the resource element in the time slot, where

[0149] Resource elements of parameter set μ and antenna port p Corresponds to complex value If there is no risk of aliasing, or when no particular antenna port or parameter set is specified, then the indices p and μ may be dropped, and as a result, the complex value may be or

[0150] In addition, a physical resource block is defined as consecutive subcarriers.

[0151] Point A is used as a common reference point for the resource block grid and can be obtained as follows.

[0152] - offsetToPointA for PCell downlink represents the frequency offset between point A and the lowest subcarrier of the lowest resource block, which overlaps the SS / PBCH block used by the UE for initial cell selection, and is expressed in units of resource blocks, where the subcarrier spacing for FR1 is assumed to be 15 kHz and the subcarrier spacing for FR2 is assumed to be 60 kHz;

[0153] -absoluteFrequencyPointA represents the frequency position of point A, expressed as an absolute radio frequency channel number (ARFCN).

[0154] Common resource blocks are numbered from 0 upwards in the frequency domain for a subcarrier spacing configuration of μ.

[0155] The center of subcarrier 0 of common resource block 0 for subcarrier spacing configuration μ coincides with "point A". The common resource block number in the frequency domain can be given by the following equation 1 and resource elements (k, l) for subcarrier spacing configuration μ.

[0156] [Equation 1]

[0157]

[0158] Here, k can be defined relative to point A, so that k=0 corresponds to a subcarrier centered at point A. Physical resource blocks are defined within bandwidth parts (BWPs) and are spaced from 0 to number, where i is the number of the BWP. Physical resource block n in BWP i PRB and public resource block n CRB The relationship between can be given by the following equation 2.

[0159] [Equation 2]

[0160]

[0161] Here, It can be a common resource block where the BWP starts relative to common resource block 0.

[0162] Bandwidth Part (BWP)

[0163] The NR system can support up to 400MHz per component carrier (CC). If a UE operating in a wideband CC operates while turning on RF continuously for all CCs, UE battery consumption may increase. Alternatively, when considering several use cases operating in one wideband CC (e.g., eMBB, URLLC, mMTC, V2X, etc.), different parameter sets (e.g., subcarrier spacing) may be supported for each frequency band in the corresponding CC. Alternatively, the maximum bandwidth capability for each UE may vary. By taking this into account, the BS may instruct the UE to operate only in part of the bandwidth of the wideband CC instead of the entire bandwidth and intends to define the corresponding part of the bandwidth as a bandwidth part (BWP) for convenience. The BWP may be composed of consecutive resource blocks (RBs) on the frequency axis and may correspond to a parameter set (e.g., subcarrier spacing, CP length, slot / microslot duration).

[0164] At the same time, the base station can configure multiple BWPs even within one CC configured to the UE. As an example, a BWP occupying a relatively small frequency domain can be configured in the PDCCH monitoring time slot, and the PDSCH indicated in the PDCCH can be scheduled to a BWP larger than this. Alternatively, when the UE is concentrated on a specific BWP, some UEs can be configured with other BWPs for load balancing. Alternatively, considering the frequency domain inter-cell interference elimination between adjacent cells, part of the spectrum of the entire bandwidth can be excluded and two BWPs can be configured even in the same time slot. That is, the base station can configure at least one DL / UL BWP to the UE associated with the broadband CC and can activate at least one DL / UL BWP among the configured DL / UL BWPs at a specific time (through L1 signaling or MAC CE or RRC signaling), and can indicate switching to another configured DL / UL BWP (through L1 signaling or MAC CE or RRC signaling), or based on a timer when the timer value expires, it can switch to a fixed DL / UL BWP. In this case, the activated DL / UL BWP is defined as an active DL / UL BWP. However, in a situation where the UE is in an initial access procedure or before an RRC connection is established, the UE may not receive configuration for the DL / UL BWP, and in such a situation, the DL / UL BWP assumed by the UE is defined as an initial active DL / UL BWP.

[0165] Physical channels and general signal transmission

[0166] Figure 6 The figure illustrates physical channels and general signal transmission used in the 3GPP system. In a wireless communication system, a UE receives information from an eNB through a downlink (DL), and the UE transmits information from the eNB through an uplink (UL). The information transmitted and received by the eNB and the UE includes data and various control information, and there are various physical channels according to the type / purpose of the information transmitted and received by the eNB and the UE.

[0167] When the UE is powered on or newly enters a cell, the UE performs an initial cell search operation (S601), such as synchronization with an eNB. To this end, the UE may receive a primary synchronization signal (PSS) and (a secondary synchronization signal (SSS)) from the eNB, synchronize with the eNB, and acquire information such as a cell ID. Thereafter, the UE may receive a physical broadcast channel (PBCH) from the eNB and acquire intra-cell broadcast information. At the same time, the UE receives a downlink reference signal (DL RS) in the initial cell search step to check the downlink channel status.

[0168] The UE that has completed the initial cell search acquires more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to information loaded on the PDCCH (S602).

[0169] Meanwhile, when there is no radio resource for first accessing the eNB or for signal transmission, the UE may perform a random access procedure (RACH) to the eNB (S603 to S606). To this end, the UE may send a specific sequence to the preamble through the physical random access channel (PRACH) (S603 and S605), and receive a response message (random access response (RAR) message) for the preamble through the PDCCH and the corresponding PDSCH. In the case of a contention-based RACH, a contention resolution procedure (S606) may be additionally performed.

[0170] Then, the UE performing the above process may perform PDCCH / PDSCH reception (S607) and physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) transmission (S608) as a general uplink / downlink signal transmission process. In particular, the UE may receive downlink control information (DCI) through the PDCCH. Here, the DCI may include control information such as resource allocation information for the UE, and the format may be applied differently depending on the purpose of use.

[0171] For example, in the NR system, DCI format 0_0 and DCI format 0_1 ​​can be used to schedule PUSCH in one cell, and DCI format 1_0 and DCI format 1_1 can be used to schedule PDSCH in one cell. The information included in DCI format 0_0 is CRC-scrambled and transmitted by C-RNTI, CS-RNTI or MCS-C-RNTI. In addition, DCI format 0_1 ​​is used to reserve PUSCH in one cell. The information included in DCI format 0_1 ​​is CRC-scrambled and transmitted by C-RNTI, CS-RNTI, SP-CSI-RNTI or MCS-C-RNTI. DCI format 1_0 is used to schedule PDSCH in one DL cell. The information included in DCI format 1_0 is CRC-scrambled and transmitted by C-RNTI, CS-RNTI or MCS-C-RNTI. DCI format 1_1 is used to schedule PDSCH in one cell. The information included in DCI format 1_1 is CRC-scrambled and transmitted by C-RNTI, CS-RNTI or MCS-C-RNTI. DCI format 2_1 is used to inform the UE that PRBs and OFDM symbols that may be assumed not to be transmitted. Information included in DCI format 2_1 (such as preemption indication 1, preemption indication 2, ..., preemption indication n, etc.) is CRC-scrambled and transmitted by INT-RNTI.

[0172] Meanwhile, the control information transmitted by the UE to the eNB through the uplink or received by the UE from the eNB may include a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), etc. The UE may transmit control information such as CQI / PMI / RI, etc. through the PUSCH and / or the PUCCH.

[0173] DL and UL transmission / Receive Operation

[0174] Downlink transmit / receive operation

[0175] Figure 7 is a diagram illustrating an example of a downlink transmission / reception operation.

[0176] refer to Figure 7, the BS schedules downlink transmission such as frequency / time resources, transmission layer, downlink precoder, MCS, etc. (step S701). Specifically, the BS can determine the beam used for PDSCH transmission to the UE through the above-mentioned beam management operation. The UE receives downlink control information (DCI) (i.e., scheduling information including PDSCH) for downlink scheduling from the BS on the PDCCH (step S702). DCI format 1_0 or 1_1 can be used for downlink scheduling, and specifically, DCI format 1_1 includes the following information: an identifier for the DCI format, a bandwidth part indicator, a frequency domain resource allocation, a time domain resource allocation, a PRB bundling size indicator, a rate matching indicator, a ZP CSI-RS trigger, (one or more) antenna ports, a transmission configuration indication (TCI), an SRS request and a demodulation reference signal (DMRS) sequence initialization, an MCS (modulation and coding scheme), a new data indicator, a redundancy version, a HARQ process number, a downlink allocation index, etc.

[0177] In case of 2-codeword transmission (eg, maxNrofCodeWordsScheduledByDCI=2), the MCS / NI / RV fields may be configured for each of TB1 and TB2.

[0178] Specifically, according to each state indicated in the (one or more) antenna port field / index, the number of DMRS ports can be scheduled, and in addition, single-user (SU) / multi-user (MU) transmission scheduling is also available. Specifically, based on the "dmrs type" and "maxLength", tables / rules for interpreting the (one or more) antenna port field values ​​can be defined respectively. The number of DMRS CDM groups without data / (one or more) DMRS ports / the number of front-load symbols corresponding to one CW / two CWs can be determined according to the (one or more) antenna port field values. In addition, the TCI field is configured with 3 bits, and according to the TCI field value, up to 8 TCI states are indicated to the QCL for DMRS. The UE receives downlink data from the BS on the PDSCH (step S703). When the UE detects a PDCCH including DCI format 1_0 or 1_1, the UE decodes the PDSCH according to the indication of the corresponding DCI.

[0179] Here, when the UE receives a PDSCH scheduled by DCI format 1_1, the DMRS configuration type can be configured by a higher-layer parameter "dmrs-Type" in the UE, and the DMRS type is used to receive the PDSCH. In addition, in the UE, the maximum number of front-loaded DMRA symbols for the PDSCH can be configured by a higher-layer parameter "maxLength".

[0180] In the case of DMRS configuration type 1, when a single codeword is scheduled and an antenna port mapped to an index {2, 9, 10, 11, or 30} is specified in the UE, or when two codewords are scheduled in the UE, the UE assumes that all remaining orthogonal antenna ports are not associated with PDSCH transmission to another UE. Alternatively, in the case of DMRS configuration type 2, when a single codeword is scheduled and an antenna port mapped to an index {2, 10, or 23} is specified in the UE, or when two codewords are scheduled in the UE, the UE assumes that all remaining orthogonal antenna ports are not associated with PDSCH transmission to another UE.

[0181] When the UE receives the PDSCH, the precoding granularity P' may be assumed to be continuous resource blocks in the frequency domain. Here, P' may correspond to a value in {2, 4, and broadband}. When P' is determined to be broadband, the UE does not predict that the PDSCH is scheduled to non-contiguous PRBs, and the UE may assume that the same precoding is applied to the allocated resources. In contrast, when P' is determined to be any one of {2 and 4}, the precoding resource block group (PRG) is divided into P'contiguous PRBs. The number of actual contiguous PRBs in each PRG may be one or more. The UE may assume that the same precoding is applied to continuous downlink PRBs in the PRG.

[0182] To determine the modulation order, target code rate, and transport block size in PDSCH, the UE first reads the 5-bit MCD field in the DCI and determines the modulation order and target code rate. In addition, the UE reads the redundancy version field in the DCI and determines the redundancy version. In addition, the UE determines the transport block size by using the number of layers before rate matching and the total number of allocated PRBs.

[0183] A transport block can be constructed with one or more code block groups (CBGs), and one CBG can be constructed with one or more code blocks (CBs). In addition, in the NR system, data transmission / reception in CB / CBG units and data transmission / reception in transport block units may also be available. Therefore, the UE can receive information about CB / CBG from the BS through DCI (e.g., DCI format 0_1, DCI format 1_1, etc.). In addition, the UE can receive information about data transmission units (e.g., TB / CB / CBG) from the BS.

[0184] Meanwhile, the codewords, layers, and antenna ports used for PDSCH are mapped as follows. According to Equation 3, the complex-valued modulation symbol for codeword (CW)q is is mapped to layer x(i)=[x (0) (i)…x (υ-1) (i)] T and and the layer x(i) is mapped to the antenna port. Here, v represents the number of layers, and Indicates the number of modulation symbols per layer.

[0185] [Equation 3]

[0186] in

[0187] A set of antenna ports {p0, ..., p υ-1 That is, the antenna ports may be sequentially mapped to the layers according to the order of the DMRS ports indicated to the UE through the DMRS table.

[0188] Uplink transmit / receive operation

[0189] Figure 8 An example of uplink transmission and reception operation is shown.

[0190] refer to Figure 8 , the BS schedules uplink transmission such as frequency / time resources, transport layer, uplink precoder, MCS, etc. (step S801). In particular, the BS can determine the beam for PUSCH transmission of the UE through the above-mentioned beam management operation. The UE can receive DCI (i.e., including scheduling information of PUSCH) for downlink link scheduling on PDCCH (step S802). DCI format 0_0 or 0_1 can be used for uplink scheduling, and in particular, DCI format 0_1 ​​may include information such as: an identifier for DCI format, UL / supplementary uplink (SUL) indicator, bandwidth part indicator, frequency domain resource assignment, time domain resource assignment, frequency hopping flag, modulation and coding scheme (MCS), SRS resource indicator (SRI), precoding information and number of layers, antenna port, SRS request, DMRS sequence initialization, and uplink shared channel (UL-SCH) indicator.

[0191] In particular, SRS resources configured in an SRS resource set associated with a higher layer parameter "usage" may be indicated by the SRS resource indicator field. In addition, "spatialRelationInfo" may be configured for each SRS resource, and the value of "spatialRelationInfo" may be one of {CRI, SSB, and SRI}.

[0192] In addition, the UE may send uplink data to the BS on the PUSCH (step S803). When the UE detects a PDCCH including DCI format 0_0 or 0_1, the UE may send the corresponding PUSCH according to the indication of the corresponding DCI. Two schemes are supported for PUSCH transmission, including a codebook-based transmission scheme and a non-codebook-based transmission scheme.

[0193] In the case of codebook based transmission, when the higher layer parameter "txConfig" is set to "codebook", the UE is configured for codebook based transmission. Conversely, when the higher layer parameter "txConfig" is set to "nonCodebook", the UE is configured for non-codebook based transmission. When the higher layer parameter "txConfig" is not configured, the UE does not predict that the PUSCH is scheduled by DCI format 0_1. When PUSCH is scheduled by DCI format 0_0, PUSCH transmission is based on a single antenna port. In the case of codebook based transmission, PUSCH can be scheduled by DCI format 0_0, DCI format 0_1 ​​or semi-statically. When PUSCH is scheduled by DCI format 0_1, the UE determines the PUSCH transmit precoder based on the SRI, the transmit precoding matrix indicator (TPMI), and the transmission rank from the DCI as given by the SRS resource indicator and precoding information and the layer number field. The TPMI is used to indicate the precoder to be applied on the antenna port, and when multiple SRS resources are configured, the TPMI corresponds to the SRS resource selected by the SRI. Alternatively, when a single SRS resource is configured, the TPMI is used to indicate the precoder to be applied on the antenna port and corresponds to the corresponding single SRS resource. The transmit precoder is selected from the uplink codebook with the same antenna port number as the higher layer parameter "nrofSRS-Ports". When the UE is set to the higher layer parameter "txConfig" set to "codebook", at least one SRS resource is configured in the UE. The SRI indicated in time slot n is associated with the most recent transmission of the SRS resource identified by the SRI, and here, the SRS resource precedes the PDCCH carrying the SRI (i.e., time slot n).

[0194] In the case of non-codebook based transmission, PUSCH can be scheduled by DCI format 0_0, DCI format 0_1 ​​or semi-statically. When multiple SRS resources are configured, the UE can determine the PUSCH precoder and transmission rank based on the broadband SRI, and here, the SRI is given by the SRS resource indicator in the DCI or by the higher layer parameter "srs-ResourceIndicator". The UE can use one or more SRS resources for SRS transmission, and here, the number of SRS resources can be configured based on the UE capability for simultaneous transmission in the same RB. Only one SRS port is configured for each SRS resource. Only one SRS resource can be configured as a higher layer parameter "usage" set to "nonCodebook". The maximum number of SRS resources that can be configured for non-codebook based uplink transmission is 4. The SRI indicated in time slot n is associated with the most recent transmission of the SRS resource identified by the SRI, and here, the SRS transmission is before the PDCCH carrying the SRI (i.e., time slot n).

[0195] DMRS (Demodulation Reference Signal)

[0196] DMRS related operations for PDSCH reception are described.

[0197] When a UE receives a PDSCH scheduled by DCI format 1_0 or receives a PDSCH before any dedicated higher layer in the configuration AdditionalPosition, maxLength and dmrs-Type parameters, the UE assumes that there is no PDSCH in any symbol carrying DM-RS other than PDSCH with an allocated duration of two symbols with PDSCH mapping type B, sends a single symbol front-loaded DM-RS of configuration type 1 on DM-RS port 1000, and all remaining orthogonal antenna ports are not involved in the transmission of PDSCH to another UE.

[0198] In addition, for PDSCH with mapping type A, the UE assumes that dmrs-AdditionalPosition = 'pos2' and that up to two additional single symbol DM-RSs are present in the timeslot according to the PDSCH duration. For PDSCH with an allocation duration of 7 symbols for normal CP or 6 symbols for extended CP with mapping type B, when the current DM-RS symbol is located in the 1st symbol and the 2nd symbol of the PDSCH allocation duration, respectively, the UE assumes that the additional single symbol DM-RS is present in the 5th symbol or the 6th symbol. Otherwise, the UE assumes that there are no additional DM-RS symbols. In addition, for PDSCH with an allocation duration of 4 symbols with mapping type B, the UE assumes that there are no additional DM-RS symbols, and for PDSCH with an allocation duration of 2 symbols with mapping type B, the UE assumes that there are no additional DM-RS symbols, and the UE assumes that PDSCH is present in the symbol carrying DM-RS.

[0199] Fig. 9 is a flow chart illustrating an example of a DL DMRS procedure.

[0200] The BS sends DMRS configuration information to the UE (step S910).

[0201] The DMRS configuration information may refer to a DMRS-DownlinkConfig information element (IE). The DMRS-DownlinkConfig IE may include a dmrs-Type parameter, a dmrs-AdditionalPosition parameter, a maxLength parameter, and a phaseTrackingRS parameter.

[0202] The "dmrs-Type" parameter is a parameter for selecting the DMRS configuration type to be used for DL. In NR, DMRS can be divided into two configuration types: (1) DMRS configuration type 1 and (2) DMRS configuration type 2. DMRS configuration type 1 has a higher RS ​​density in the frequency domain, and DMRS configuration type 2 has more DMRS antenna ports.

[0203] The "dmrs-additionalPosition" parameter is a parameter indicating the position of the additional DMRS on the DL. In the absence of a corresponding parameter, the UE applies the pos2 value. For DMRS, the first position of the front-loaded DMRS is determined according to the PDSCH mapping type (type A or type B), and additional DMRS can be set to support high-speed UEs. The front-loaded DMRS is indicated by RRC signaling and DCI (downlink control information).

[0204] The "maxLength" parameter is a parameter indicating the maximum number of OFDM symbols used for DL ​​front-loaded DMRS. The phaseTrackingRS parameter is a parameter used to configure DL PTRS. In the event that this parameter does not exist or is terminated, the UE assumes that there is no DL PTRS.

[0205] The BS generates a sequence for a DMRS (step S920).

[0206] A sequence for DMRS is generated according to Equation 3 below.

[0207] [Equation 3]

[0208]

[0209] The pseudo-random sequence c(i) is defined in 3gpp TS 38.211 5.2.1. That is, it can be a Gold sequence of length 31 using two m sequences. The pseudo-random sequence generator is initialized by the following equation 4.

[0210] [Equation 4]

[0211]

[0212] Here, l is the number of OFDM symbols in a time slot, and is the timeslot number in the frame.

[0213] In addition, if the regulations and in case PDSCH is scheduled by PDCCH using DCI format 1_1 with CRC scrambled by C-RNTI, MCS-C-RNTI or CS-RNTI, given by higher layer parameters scramblingID0 and scramblingID1 in DMRS-DownlinkConfig IE, respectively

[0214] - If specified and in case PDSCH is scheduled by PDCCH using DCI format 1_0 with CRC scrambled by C-RNTI, MCS-C-RNTI or CS-RNTI, given by the higher layer parameter scramblingID0 in the DMRS-DownlinkConfig IE

[0215] otherwise, And in the case of using DCI format 1_1, the number n SCID ∈{0,1} is given by the DMRS sequence initialization field in the DCI associated with the PDSCH transmission.

[0216] The BS maps the generated sequence to a resource element (step S930). Here, the resource element may include at least one of time, frequency, antenna port, or code.

[0217] The position I0 and the reference point I of the first DMRS symbol can be determined according to the mapping type. In mapping type A, the DMRS position is fixed to the third (POS2) or fourth (POS3), and the starting symbol of the PDSCH can be 0 to 3. The PDSCH length can be 3 to 14 in the case of normal CP, and can be 3 to 12 in the case of extended CP. The DMRS symbol can start from the second or third symbol, regardless of the start and length of the PDSCH, which means that the symbol cannot be applied when the starting symbol of the PDSCH is greater than 3. Mapping type A is used for slot-based scheduling. Meanwhile, in mapping type B, the DMRS position is fixed to the first symbol of the allocated PDSCH. The PDSCH starting symbol can be 0 to 12 in the case of normal CP, and can be 0 to 10 in the case of extended CP. The PDSCH length can be 2, 4 or 7 symbols in the case of normal CP, and can be 2, 4 or 6 symbols in the case of extended CP. The DMRS symbol can start from the first PDSCH symbol, regardless of the PDSCH start. Mapping type B can be used for mini-slot-based scheduling.

[0218] The BS transmits a DMRS to the UE on the resource unit (step S940). The UE receives the PDSCH using the received DMRS.

[0219] QCL (quasi co-location)

[0220] The antenna ports are defined so that the channel in which a symbol on the antenna port is transmitted can be inferred from the channel in which a different symbol on the same antenna port is transmitted. Two antenna ports may have a quasi-co-located or quasi-co-sited (QC / QCL) relationship when the properties of the channel in which a symbol on one antenna port is transmitted can be inferred from the channel in which a symbol on a different antenna port is transmitted.

[0221] Here, the channel attributes include at least one of delay spread, Doppler spread, frequency / Doppler shift, average received power, receive timing / average delay, and spatial Rx parameters. Here, the spatial Rx parameters refer to spatial (receiving) channel attribute parameters such as arrival angle.

[0222] The US may be configured with a list of up to M TCI state configurations in the higher layer parameter PDSCH-Config in order to decode the PDSCH from the detected PDCCH with the expected DCI for the corresponding UE and a given serving cell. M depends on the capabilities of the UE.

[0223] Each TCI state includes parameters for configuring a quasi co-location relationship between one or two DL reference signals and a DM-RS port of a PDSCH.

[0224] The quasi co-location relationship is configured as a higher layer parameter qcl-Type1 for the first DL RS and qcl-Type2 (when configured) for the second DL RS. The two DL RSs are different from each other in QCL type regardless of whether the two DL RSs are DL RSs with the same reference or DL ​​RSs with different references.

[0225] The quasi co-location type corresponding to each DL RS may be given by the higher layer parameter qcl-Type of QCL-Info and may take one of the following values:

[0226] - "QCL-TypeA": {Doppler shift, Doppler spread, average delay, delay spread}

[0227] - "QCL-TypeB": {Doppler shift, Doppler spread}

[0228] - "QCL-TypeC": {Doppler shift, average delay}

[0229] - "QCL-TypeD": {spatial Rx parameters}

[0230] For example, when the target antenna port is a specific NZP CSI-RS, from the perspective of QCL-Type A, the corresponding NZP CSI-RS antenna port may be indicated / configured to perform QCL with a specific TRS, and from the perspective of QCL-TYPE D, the corresponding NZP CSI-RS antenna port may be indicated / configured to perform QCL with a specific SSB. The UE receiving the indication / configuration may receive the corresponding NZP CSI-RS by using the Doppler delay value measured in the QCL-TypeA TRS, and apply the Rx beam for receiving the QCL-TypeD SSB to the reception of the corresponding NZP CSI-RS.

[0231] The UE may receive the activation command via MAC CE signaling, which is used to map up to eight TCI states to code points of the DCI field "Transmission Configuration Indication".

[0232] The standard content related to the above-mentioned QCL may be the same as the following Table 5 (for example, see 3gpp TS 38.214. Section 5.1.5).

[0233] [Table 5]

[0234]

[0235]

[0236]

[0237] Regarding beam indication, for the purpose of at least QCL (quasi co-location) indication, the UE can be configured by RRC with a list of up to M candidate transmission configuration indication (TCI) states.

[0238] Each TCI state may be set to an RS set. Each ID of a DL RS (QCL type D) for spatial QCL purposes in at least the RS set may be referred to as one of the DL RS types such as SSB, P-CSI RS, SP-CSI RS, A-CSI RS, etc. Initialization / update of the ID of the DL RS in at least the RS set for spatial QCL purposes may be performed by at least explicit signaling.

[0239] The TCI-State IE is associated with a quasi co-location (QCL) type corresponding to one or two DL reference signals (RS). The TCI-State IE may include parameters such as bwp-id / reference signal / QCL type, etc.

[0240] The bwp-Id parameter indicates the DL BWP where the RS is located, the cell parameter indicates the carrier where the RS is located, and the reference signal parameter indicates the reference antenna port (or ports) that become the quasi-co-site source for the corresponding target antenna port (or ports) or the reference signal including the reference antenna port (or ports). The target antenna port (or ports) may be a CSI-RS, a PDCCH DMRS, or a PDSCH DMRS. In one example, in order to indicate the QCL reference RS information for the NZP CSI-RS, the NZP CSI-RS resource configuration information may indicate the corresponding TCI state ID. In another example, in order to indicate the QCL reference information for the PDCCH DMRS antenna port, each CORESET configuration may indicate the TCI state ID. In yet another example, in order to indicate the QCL reference information for the PDSCH DMRS antenna port, the TCI state ID may be indicated by the DCI.

[0241] The description described above (e.g., 3GPP system, frame structure, DL and UL transmission / reception operations, etc.) may be applied / used in conjunction with the method and / or embodiment proposed in the present disclosure, or may be supplemented to clarify the technical features of the method proposed in the present disclosure. In the present disclosure, the symbol " / " may refer to all or some of the contents distinguished by the " / ".

[0242] Multiple TRP (send and receive point) related operations

[0243] Coordinated multi-point (CoMP) technology is a scheme in which multiple base stations (for example, using an X2 interface) exchange or utilize channel information (for example, RI / CQI / PMI / LI, etc.) fed back from a user equipment (UE) to perform cooperative transmission with the UE to effectively control interference. Depending on the scheme used, cooperative transmission can be divided into joint transmission (JT), coordinated scheduling (CS), coordinated beamforming (CB), dynamic point selection (DPS), dynamic point blackening (DPB), etc.

[0244] Non-coherent joint transmission (NCJT) may refer to collaborative transmission without considering interference (i.e., without interference). For example, NCJT may be a scheme in which a base station sends data to one UE through multiple TRPs by using the same time resources and frequency resources. In this scheme, multiple TRPs of a base station may be configured to send data to the UE through different layers by using different demodulation reference signal (DMRS) ports. In other words, NCJT may correspond to a transmission scheme in which transmission of MIMO layers is performed from two or more TRPs without adaptive precoding between TRPs.

[0245] NCJT can be classified into fully overlapping NCJT and partially overlapping NCJT, in which the time and frequency resources used for transmission by each base station (or TRP) are fully overlapped, and in which the time and frequency resources used for transmission by each base station (or TRP) are partially overlapped. This is only for the convenience of explanation in the present disclosure, and it goes without saying that in the embodiments and methods to be described below, the above-mentioned terms can be replaced with other terms having the same technical meaning. For example, in the case of partially overlapping NCJT, both the data of the first base station (e.g., TRP 1) and the data of the second base station (e.g., TRP 2) can be sent in some time resources and / or frequency resources, and the data of only one of the first base station and the second base station can be sent in the remaining time resources and / or frequency resources.

[0246] TRP sends data scheduling information as DCI (downlink control information) to the NCJT receiving UE. From the perspective of downlink control information (DCI) transmission, M-TRP (multi-TRP) transmission can be divided into i) M-TRP transmission based on M-DCI (multi-DCI) in which each TRP sends different DCI and ii) M-TRP transmission based on S-DCI (single DCI) in which one TRP sends DCI.

[0247] First, the MTRP scheme based on a single DCI will be described. In the MTRP scheme based on a single DCI in which a representative TRP sends scheduling information of data sent by itself and data sent by another TRP through one DCI, the MTRP cooperatively sends a common PDSCH, and each TRP participating in the cooperative transmission spatially divides the corresponding PDSCH into different layers (i.e., different DMRS ports). In other words, the MTRP sends one PDSCH, but each TRP sends only some of the multiple layers of the PDSCH. For example, when sending 4 layers of data, TRP 1 sends 2 layers to the UE, and TRP 2 sends the remaining 2 layers to the UE.

[0248] In this case, the scheduling information for PDSCH is indicated to the UE through one DCI, and the corresponding DCI indicates which DMRS port uses which QCL RS and QCL type information (this is different from the conventional indication of the QCL RS and type commonly applied to all DMRS ports indicated by the DCI). That is, M TCI states (M=2 for 2TRP cooperative transmission) are indicated by the TCI field in the DCI, and the QCL RS and type are identified by using the M TCI states that are different for the M DMRS port groups. In addition, the DMRS port information can be indicated by using a new DMRS table.

[0249] As an example, in the case of S-DCI, since all scheduling information for data sent by M TRPs should be delivered through one DCI, S-DCI can be used in an ideal backhaul (BH) environment where two TRPs can dynamically coordinate with each other.

[0250] Secondly, the MTRP method based on multiple DCI will be described. MTRP sends different DCI and PDSCH respectively (UE receives N DCI and N PDSCH from N TRPs), and the corresponding PDSCH is sent by overlapping (partially or completely) on different time resources. The corresponding PDSCH is sent through different scrambling IDs, and the corresponding DCI can be sent through Coresets belonging to different Coreset groups (the coreset group can be identified as the index defined in the coreset configuration of each Coreset. For example, if Coreset 1 and 2 are set to index = 0 and Coreset 3 and 4 are set to index = 1, Coreset 1 and 2 belong to Coreset group 0 and Coreset 3 and 4 belong to Coreset group 1. If no index is defined for the Coreset, this can be interpreted as index = 0). If multiple scrambling IDs are set in one service cell, or two or more coreset groups are set, the UE can receive data in MTRP operation based on multiple DCI.

[0251] For example, a single DCI-based MTRP scheme or a multi-DCI-based MTRP scheme may be indicated to the UE via separate signaling. As an example, when multiple CRS patterns are indicated to the UE for MTRP operation of a serving cell, the PDSCH rate matching for the CRS may be different depending on whether the MTRP operation is a single DCI-based MTRP operation or a multi-DCI-based MTRP operation.

[0252] The base station described in the present disclosure may be a general term for an object for sending data to a UE and receiving data from a UE. For example, the base station described herein may be a concept including one or more transmission points (TPs), one or more transmission and reception points (TRPs), and the like. For example, the multiple TPs and / or multiple TRPs described herein may be included in one base station or in multiple base stations. In addition, the TPs and / or TRPs may include a panel, a transmission and reception unit, and the like of a base station.

[0253] In addition, the TRP described in the present disclosure means an antenna array having one or more antenna elements available in a network located in a specific geographical location in a specific area. Although the present disclosure is described with respect to "TRP" for the convenience of explanation, the TRP can be replaced with a base station, a transmission point (TP), a cell (e.g., a macro cell / small cell / pico cell, etc.), an antenna array or a panel and is similarly understood and applied.

[0254] In addition, the CORESET group ID described in the present disclosure may refer to an index / identification information (e.g., ID) / indicator, etc., for distinguishing a CORESET configured / associated with each TRP / panel (or for each TRP / panel). In addition, a CORESET group may be a group / collection of CORESETs distinguished by index / identification information (e.g., ID) for distinguishing a CORESET and a CORESET group ID. For example, the CORESET group ID may be specific index information defined in the CORESET configuration. For example, the CORESET group may be configured / indicated / defined by an index defined in the CORESET configuration for each CORESET. The CORESET group ID may be configured / indicated via higher layer signaling (e.g., RRC signaling) / L2 signaling (e.g., MAC-CE) / L1 signaling (e.g., DCI).

[0255] For example, a ControlResourceSet information element (IE) as a higher layer parameter is used to configure a time / frequency control resource set (CORESET). For example, a control resource set may be related to detection and reception of downlink control information. Examples of a ControlResourceSet IE may include a CORESET-related ID (e.g., controlResourceSetID), an index of a CORESET pool for a CORESET (e.g., CORESETPoolIndex), a time / frequency resource configuration of the CORESET, and TCI information related to the CORESET. For example, the index of the CORESET pool (e.g., CORESETPoolIndex) may be set to 0 or 1.

[0256] For example, it may be indicated / configured so that PDCCH detection for each TRP / panel is performed in units of each CORESET group. And / or, it may be indicated / configured so that uplink control information (e.g., CSI, HARQ-A / N, SR) and / or uplink physical channel resources (e.g., PUCCH / PRACH / SRS resources) for each TRP / panel are divided and managed / controlled in units of each CORESET group. And / or, HARQ A / N (processing / retransmission) of PDSCH / PUSCH, etc. scheduled for each TRP / panel may be managed in units of each CORESET group.

[0257] In addition, the UE can identify the DCI-scheduled PUSCH (or PUCCH) received by different CORESETs (or CORESETs belonging to different CORESET groups) as PUSCH (or PUCCH) sent to different TRPs or PUSCH (or PUCCH) of different TRPs. In addition, the scheme for UL transmissions (e.g., PUSCH / PUCCH) sent to different TRPs can even be equally applied to UL transmissions (e.g., PUSCH / PUCCH) sent to different panels belonging to the same TRP.

[0258] M-TRP transmission technology

[0259] The M-TRP transmission technology in which multiple (e.g., M) TRPs send data to a single user equipment (UE) can be classified into two types: eMBB M-TRP (or M-TRP eMMB) transmission, which is a scheme for significantly increasing the transmission rate, and URLLC M-TRP (or M-TRP URLLC) transmission, which is a scheme for increasing the reception success rate and reducing delay.

[0260] URLLC M-TRP may refer to a scheme in which M-TRP uses different resources (e.g., layer / time resources / frequency resources, etc.) to send the same TB (transport block). A UE configured with the URLLC M-TRP transmission scheme may use DCI to indicate several TCI states, and assumes that the data received using the QCL RS (reference signal) of each TCI state is the same TB. On the other hand, eMBBM-TRP may refer to a scheme in which M-TRP uses different resources (e.g., layer / time resources / frequency resources, etc.) to transmit different TBs. A UE configured with the eMBB M-TRP transmission scheme may use DCI to indicate several TCI states, and assumes that the data received using the QCL RS (reference signal) of each TCI state is a different TB.

[0261] For example, the UE can separately distinguish and use the RNTI configured for MTRP-URLLC and the RNTI configured for MTRP-eMBB, and can determine / decide whether the corresponding M-TRP transmission is URLLC transmission or eMBB transmission. That is, in the case where CRC masking of DCI received by the UE is performed by using the RNTI configured with MTRP-URLLC usage, this can correspond to URLLC transmission, and in the case where CRC masking of DCI is performed by using the RNTI configured with MTRP-URLLC usage, this can correspond to eMBB transmission.

[0262] Table 6 shows various schemes that can be considered for URLLC M-TRP transmission. Referring to Table 8, there are various schemes of SDM / FDM / TDM schemes.

[0263] [Table 6]

[0264]

[0265]

[0266]

[0267] For example, Scheme 3 / 4 of Table 6 is a scheme considered in TDM-based URLL. Specifically, Scheme 4 refers to a method in which one TRP sends a TB in one time slot, and has the effect of increasing the probability of data reception by receiving the same TB from several TRPs in several time slots. In contrast, Scheme 3 refers to a method in which one TRP sends a TB through several consecutive OFDM symbols (i.e., symbol groups), and multiple TRPs can be set to send the same TB through different symbol groups in one time slot.

[0268] Reliability Improvement Method in Multi-TRP

[0269] Fig.10 The diagram illustrates a transmission and reception method for reliability improvement supported by multiple TRPs, and the following two methods may be considered.

[0270] Fig.10 The example of (a) shows a case where layer groups sending the same CW (codeword) / TB (transport block) correspond to different TRPs. That is, the same CW can be sent through different layers / layer groups. In this case, the layer group may refer to a layer set including one or more layers. Therefore, the amount of transmission resources increases with the increase in the number of layers, and thus, there is an advantage that robust channel coding with a low coding rate can be used for TBs. In addition, since the channels from multiple TRPs are different, an improvement in the reliability of the received signal can be expected based on the diversity gain.

[0271] at the same time, Fig.10 Example (b) shows a case where different CWs are sent through layer groups corresponding to different TRPs. That is, different CWs can be sent through different layers / layer groups. In this case, it can be assumed that the TBs corresponding to the first CW (CW#1) and the second CW (CW#2) are the same. Therefore, this can be considered as an example of repeated transmission of the same TB. Fig.10 (b) In the case of Fig.10However, there is an advantage that the coding rate can be adjusted by indicating different RV (Redundancy Version) values ​​according to the channel environment to encode bits generated by the same TB, or the modulation order of each CW can be adjusted.

[0272] exist Fig.10 (a) or Fig.10 In (b), the same TB is repeatedly sent through different layer groups, and each layer group is sent by a different TRP / panel, and the data reception probability can be increased, which is called the URLLC M-TRP transmission scheme based on SDM (spatial division multiplexing). (One or more) layers belonging to different layer groups are sent separately through DMRS ports belonging to different DMRS CDM groups.

[0273] In addition, the content related to the above-mentioned multiple TRPs can be extended to FDM (frequency division multiplexing) schemes based on different frequency domain resources (e.g., RB / PRB (sets)) and / or TDM (time division multiplexing) schemes based on different time domain resources (e.g., time slots, symbols or sub-symbols) and SDM (spatial division multiplexing) schemes using different layers.

[0274] Hereinafter, in the present disclosure, when collaborative transmission between multiple BSs (e.g., multiple TPs / TRPs of one or more BSs, etc.) and UEs (e.g., NCJT) is considered in a wireless communication system, methods that may be proposed in this case are described. Specifically, Proposal 1 proposes a method for configuring eMBB operation or URLLC operation and a method for indicating / configuring a URLLC operation scheme. Proposal 2 proposes a method for configuring the number of repeated transmissions by considering the URLLC operation scheme. Proposal 3 proposes a method for configuring / indicating a transmission resource region in repeated transmissions in the time domain. Proposal 4 proposes a method for defining / configuring the TCI status field in DCI by considering URLLC operation.

[0275] As described above, each TRP can be classified based on an index (e.g., CORESETPoolIndex) configured in the CORESET (alternatively, a CORESET group ID). The methods described in the present disclosure are described based on one or more TP / TRPs of (one or more) BSs, but of course, the corresponding methods can even be applied to transmissions of one or more panels of (one or more) BSs in the same or similar schemes.

[0276] <Proposal 1>

[0277] As described above, transmission based on multiple TRPs (hereinafter, M-TRPs) can be classified into eMBB operations (ie, eMBBM-TRPs) and URLLC operations (ie, URLLC M-TRPs). URLLC operations can be largely classified into operations of four schemes (eg, schemes 1, 2, 3, and 4) as organized in Table 6. Since resource configuration methods and mapping relationships between TCI states and resources are defined differently for eMBB operations and URLLC operations, the BS needs to configure / indicate which operation to perform to the UE.

[0278] When considering a situation where the transmission of data for URLLC is unexpectedly required due to an emergency situation occurring in a UE receiving data for eMBB, it is preferred to dynamically indicate the eMBB operation and the URLLC operation through DCI rather than semi-statically configuring the eMBB operation and the URLLC operation through higher layer signaling. In the present disclosure, data for eMBB and data for URLLC are described by assuming multi-TRP transmission, but the methods and / or embodiments proposed in the present disclosure can even be applied to single TRP transmission. In addition, it can be assumed that data for URLLC is sent in the transmission resources allocated to the UE based on the scheduling of the BS. For example, the UE can receive data for URLLC through the PDSCH scheduled by the DCI of the corresponding PDCCH after detecting the PDCCH in the CORESET.

[0279] Hereinafter, a method for configuring an eMBB operation or a URLLC operation to a UE and a method for indicating / configuring a URLLC operation scheme proposed in the present disclosure will be described in detail.

[0280] The BS can configure which scheme (e.g., Scheme 1 to Scheme 4) of multiple URLLC operations to perform URLLC M-TRP transmission to the UE through higher layer signaling. For example, a higher layer parameter (e.g., RepSchemeEnabler) for indicating one of the schemes of URLLC operation can be configured / defined. As an example, whether the corresponding scheme is an FDM-based scheme (e.g., Scheme 2a / 2b) or a TDM-based scheme (Scheme 3 / 4) can be configured by using a higher layer parameter.

[0281] As described in Table 6, multiple schemes related to URLLC operation are defined, and since these schemes have similarities in reliability and latency, it may not be necessary to dynamically select a specific scheme. Therefore, a specific operation among multiple URLLC operations (e.g., one of schemes 2a / 2b, 3, and 4) can be semi-statically configured to the UE via higher layer signaling, and whether to perform a semi-statically configured specific URLLC operation can be dynamically indicated via DCI. For example, scheme 3 (i.e., TDM scheme) can be configured to the UE via higher layer signaling, and the URLLC operation of scheme 3 can be enabled / disabled.

[0282] Since it can be assumed that the operations included in Scheme 1 in the URLLC operation have no difference in the UE compared to the eMBB operation, it can be assumed that in the above example, the operations included in Scheme 1 can be excluded from the candidates for specific operations semi-statically configured to the UE through higher layer signaling, but the operations included in Scheme 1 can also be included in the candidates and semi-statically configured to the UE.

[0283] A specific field in the DCI may be used to dynamically indicate whether URLLC operation is to be performed.

[0284] For example, a specific bit of the field "antenna port" used to indicate the DMRS port in the DCI (e.g., DCI format 1_1) can be used for dynamic indication. In the following description, the DMRS port indication field may refer to the field "antenna port". In Proposal 1 of the present disclosure, "a specific bit of the DMRS port indication field in the DCI may be used" may mean that all or some of the bits constituting the corresponding field or the code points corresponding to the corresponding bits may be used for the method and / or embodiment of Proposal 1. In addition, the explanation may also be similarly applied to the following other proposals (e.g., Proposals 2 to 4).

[0285] Multiple TCI states can be indicated to the UE, and in this case, the UE can implicitly know that the corresponding operation is a multi-TRP transmission operation, and optimize the DMRS port indication field by newly constructing a DMRS port combination for multi-TRP transmission. In the case of optimizing the DMRS port indication field, whether the corresponding operation is an eMBB operation or a URLLC operation can be indicated by the most significant bit (MSB) or the least significant bit (LSB) of the DMRS port indication field, and the DMRS port combination can be constructed by optimizing each operation using (one or more) remaining bits other than the corresponding bit among the bits constituting the DMRS port indication field.

[0286] The following proposals may be considered together as methods for dynamically indicating different service types such as eMBB operation or URLLC operation by a BS to a UE.

[0287] In the Rel-15 standard, DCI format 1_1 is used to schedule PDSCH in one cell. DCI includes (one or more) antenna port fields (i.e., DMRS port indication fields), and the corresponding fields are defined in Table 7.3.1.2.2-1 / 2 / 3 / 4 of TS 38.212. In the following, "Rel-15 DMRS table" may refer to a DMRS table. The number of DMRS ports without data and (one or more) DMRS CDM groups may be determined based on the value of the (one or more) antenna port fields.

[0288] Meanwhile, a DMRS table having an enhanced function capable of supporting new DMRS port combinations may be introduced by considering multi-TRP transmission, and hereinafter, "Rel-16 DMRS table" may refer to the DMRS table.

[0289] Whether to perform URLLC operation can be dynamically indicated by the Rel-16 DMRS table. More specifically, when the UE is configured to use the Rel-16 DMRS table, multiple TCI states can be indicated to the UE through the DCI, and when indicating 2CW transmission, whether to perform URLLC operation can be dynamically indicated by (one or more) specific code points of the DMRS port indication field. Specific embodiments for operation will be described below.

[0290] "The state in which the UE is configured to use the Rel-16 DMRS table" may be interpreted as being configured through higher layer signaling (e.g., RRC / MAC CE) to use the Rel-16 DMRS table for interpreting the DMRS port indication field in the DCI. In other words, this state may refer to a situation in which the DMRS port indication field in the DCI is configured / indicated to be interpreted based on a newly defined DMRS table (e.g., Rel-16 DMRS table). For example, the operation may be configured through an explicit RRC / MAC CE parameter for this purpose. Alternatively, the operation may be configured through an implicit method. As an example of an implicit method, when, through MAC CE operation, there are code points mapped to multiple TCI states among the code points of the TCI state field in the DCI, it may be configured to use the Rel-16 DMRS table.

[0291] "A situation in which 2-CW transmission is indicated" may refer to a situation in which the MCS / NDI / RV value is indicated in each TB field for transport blocks (TB) 1 and TB2 in a state in which the maximum number of codewords is configured to be 2 (i.e., a state in which maxNrofCodeWordsScheduledByDCI=2 is configured). Here, the TB field may refer to a DCI field for indicating the MCS / NDI / RV of each TB. That is, the TB field may be a concept including an MCS field, an NDI field, and an RV field. At the same time, when a specific TB field is indicated as MCS=26 and RV=1, it may be interpreted as disabling the corresponding TB, and in the proposed operation, it may be assumed that this situation does not occur. That is, it may be assumed that both TB fields do not satisfy the situation in which the combination of MCS=26 and RV=1 is satisfied.

[0292] “A case where whether to perform URLLC operation is dynamically indicated through (one or more) specific code points of the DMRS port indication field” may refer to the following case.

[0293] Table 7, which is an example of a DMRS table for Rel-15, shows Table 7.3.1.2.2-2 defined in TS 38.212. Referring to Table 7, when both CW 0 and 1 are enabled (i.e., when in the case of 2-codeword transmission), the value of the DMRS port indication field can be interpreted according to the right column of the two codewords, and in this case, the value of the DMRS port indication field can be indicated only for layers of 5 layers or more. In the Rel-15 DMRS table, a combination of DMRS ports is defined only for four code points (e.g., values ​​0 to 3) for two codewords. Therefore, URLLC operation can be dynamically indicated by using code points defined as reserved up to 4-31. To this end, a new Rel-16 DMRS table can be defined based on the Rel-15 DMRS table.

[0294] [Table 7]

[0295]

[0296] Table 8 shows an example of a Rel-16 DMRS table defined based on the Rel-15 DMRS table of Table 7 above. Table 8 is merely an example for convenience of description and does not limit the technical scope of the present disclosure. Therefore, it is obvious that the Rel-16 DMRS table is not limited to the example of Table 8 and can be extended to another combination of DMRS ports in a form having the same features.

[0297] [Table 8]

[0298]

[0299] Referring to Table 8, when code points corresponding to values ​​4 to 14 are indicated to the UE when two CWs are transmitted, the UE may know that the corresponding operation is a URLLC operation.

[0300] Specifically, according to the method of the above-mentioned proposal 1, one of the multiple URLLC operations can be configured to the UE through higher layer signaling, and the UE can know which scheme should be executed. In this case, the Rel-16 DMRS table can be applied to the value indicated by the DMRS port indication field of the DCI, and the detailed operation can be assumed as follows according to the scheme configured to the UE through higher layer signaling (at the same time, when one of the values ​​0 to 3 is indicated to the UE, the operation can be performed similarly to the Rel-15 DMRS table). That is, the transmission can be interpreted as the transmission of two CWs corresponding to different TBs.

[0301] For example, it can be assumed that when scheme 2a is configured through higher layer signaling, if one of the values ​​4 to 14 is indicated, the multiple TCI states indicated to the UE are mapped to different frequency domains. In this case, the TB information used to determine the TB size can be defined according to a fixed rule based on specific values ​​of TB 1 and 2, or configured through signaling between the BS and the UE. In this case, the value of the TB field that is not applied to the determination of the TB size can be fixed to a combination of specific MCS, RV, and NDI values. For example, when receiving a DCI in which MCS=0 and RV=0 are configured, the UE can know that the TB field of the corresponding DCI is not used to determine the TB size.

[0302] For example, it can be assumed that when scheme 2b / 3 / 4 is configured through higher layer signaling, if one of values ​​4 to 14 is indicated, different CWs sent to the UE are based on the same TB (i.e., different CWs are encoded from the same TB). That is, the UE can assume that the two CWs are CWs that are repeated with each other. In this case, the TB information used to determine the TB size can be defined according to a fixed rule based on specific values ​​of TBs 1 and 2, or can be configured through signal exchange between the BS and the UE.

[0303] In this case, the value of the TB field that is not applied to determine the TB size may be fixed to a combination of specific MCS, RV, and NDI values. For example, the value of the TB field may be defined as MCS=0 and RV=0. Alternatively, the value of the TB field that is not applied to determine the TB size may be used as a usage indicating the modulation order and / or RV value of the CW that is repeatedly transmitted. In this case, the TB field used to determine the TB size and the TB field used to determine the modulation order / RV of the TB corresponding to a specific CW may be different. For example, the TB size is determined based on the MCS of field TB 1 for CW#2 (or CW#1), but the modulation order / RV may adopt the value indicated by field TB 2.

[0304] Each code point in Table 8 may have the following characteristics.

[0305] First, the maximum number of multi-user (MU) paired UEs is limited to 2. The reason is that when the number of MU-paired UEs increases, mutual interference may increase, thereby deteriorating the capability. Therefore, mutual interference can be reduced by limiting the maximum number of MU-paired UEs.

[0306] Second, MU-paired UEs are indicated by DMRS ports of different CDM groups. The reason is that when MU-paired UEs are indicated by DMRS ports of the same CDM group, interference between DMRS ports may increase. Therefore, DMRS ports of different CDM groups are allocated to different UEs to reduce mutual interference. At the same time, in the case of value 4 / 5, it is assumed that DMRS ports of the same CDM group can be allocated to different UEs, and the reason is that it can be assumed that PDSCH can be multiplexed together into DMRS symbols, and more robust channel coding can be used.

[0307] In this example, it is assumed that a value of the URLLC scheme (e.g., schemes 2a, 2b, 3, and 4) is preconfigured by higher layer signaling, but even in other ways, a method for dynamically indicating URLLC operations can be supported based on the proposal. For example, in a state where the UE is configured to use the Rel-16 DMRS table, multiple TCI states can be indicated to the UE via DCI, and when 2CW transmission is indicated, a specific code point of the DMRS port indication field can be used to dynamically indicate whether to perform a specific operation corresponding to one of the URLLC schemes (e.g., schemes 2a, 2b, 3, and 4). To this end, different code points can be defined to correspond to different schemes. For example, in the example of Table 8, values ​​4 to 14 can correspond to scheme 2a, and values ​​15 to 31 can be used to define DMRS port combinations corresponding to schemes 2b / 3 / 4.

[0308] As in the above-mentioned proposed method, the UE can be configured with a URLLC operation scheme based on higher layer signaling. In addition, the UE can be configured with higher layer parameters and URLLC operation schemes related to the corresponding URLLC operation. For example, in addition to the operation scheme, additional parameters (e.g., number of repetitions, repetition period, etc.) required for performing the corresponding operation scheme can be configured together in the higher layer parameters. Therefore, it can be expected that the BS that intends to indicate the URLLC operation to the UE will configure the higher layer parameters related to the URLLC operation to the UE. On the contrary, in the case where the UE does not need the URLLC operation, the higher layer parameters related to the URLLC operation may not be configured. Therefore, the UE can interpret the DMRS port indication field differently based on whether the higher layer parameters related to the URLLC operation are configured.

[0309] For example, (i) when the UE is configured with higher layer parameters related to URLLC operation, specific bits of the DMRS port indication field may be used to dynamically indicate the usage of URLLC operation according to the proposal. Conversely, (ii) when the UE is not configured with higher layer parameters related to URLLC operation, specific bits of the DMRS port indication field may be used to indicate the usage of single TRP transmission or dynamic point selection from multiple TRPs. As an example for (ii) operation, when a UE utilizing multiple TCI state indications is indicated using a specific code point through the DMRS port indication field, the UE may assume a single TRP transmission or dynamic point selection from multiple TRPs in addition to multiple TRP transmissions. As an example of a specific code point, there may be a code point indicating the case where the DMRS port combination indicated to the UE is included in a single CDM group.

[0310] At the same time, with respect to URLLC operation, whether to perform URLLC operation can be configured to the UE based on a higher layer configuration and / or RNTI and / or (one or more) specific fields. In this case, when different TB fields (e.g., TB field 1 / TB field 2) are defined in the DCI, the UE can also assume that the second CW is disabled, regardless of the MCS / RV / NDI value indicated by the TB field for a specific TB field. When it can be assumed that the second C2 is disabled, since a single CW transmission can be performed while using two different TB fields, the advantage is that different MCS / RV values ​​can be indicated for different transmission opportunities in the URLLC scheme.

[0311] The M-TRP URLLC operation or the M-TRP eMBB operation may be configured based on the method of the above-mentioned Proposal 1, and a specific scheme among multiple schemes of the M-TRP URLLC operation may be additionally configured / enabled.

[0312] <Proposal 2>

[0313] Regarding URLLC operation, Scheme 3 and Scheme 4 of the above Table 6 correspond to repeated transmission schemes in the time domain. Proposal 2 of the present disclosure proposes a method for configuring / indicating the number of transmissions for repeated transmissions of Scheme 3 and Scheme 4. As a method for configuring / indicating the total number of repeated transmissions, a method for configuring a specific value to the UE through a higher layer parameter or indicating the number of repeated transmissions based on a specific field in the DCI may be considered. Hereinafter, a method for configuring the number of repeated transmissions by considering the URLLC operation scheme will be described in detail.

[0314] Scheme 3 may refer to repeated transmission in units of mini-slots through a TDM-based scheme. For schemes 3, 2, 4, and 7, symbol unit transmission timings may be defined. In scheme 3 (TDM), n (n<=Nt1) TCI states may be indicated together with non-overlapping time resource allocations. Each transmission opportunity of a TB has a TCI and an RV and a time granularity of a mini-slot. All transmission opportunities in a time slot use a common MCS and the same single or multiple DMRS ports. The RV / TCI states may be the same or different between transmission opportunities.

[0315] As a method for configuring the number of repetitive transmissions, a method for determining the total number of repetitive transmissions according to the number of configured / indicated TCI states is proposed. In other words, the total number of repetitive transmission times can be determined according to the number of configured / indicated TCI states.

[0316] For example, a "transmission configuration indication" field (hereinafter, referred to as a TCI state field) defined to indicate a TCI state in a DCI (e.g., DCI format 1_1) may be used to indicate multiple TCI states for repeated transmission. Each code point in the TCI state field may correspond to one or more TCI state values, and code points corresponding to multiple TCI states are indicated to the UE to configure / indicate multiple TCI states to the corresponding UE.

[0317] For example, when the number of TCI states is 4, each symbol granularity (i.e., transmission opportunity) may be repeated four times. As an example, when the transmission opportunity is 2-symbol granularity, the 2-symbol granularity may be repeated four times (2+2+2+2). As an example, when the transmission opportunity is 4-symbol granularity, the 4-symbol granularity may be repeated four times (4+4+4+4). As an example, when the transmission opportunity is 7-symbol granularity, the 7-symbol granularity may be repeated four times (7+7+7+7).

[0318] As another example, when the number of TCI states is 2, each symbol granularity may be repeated twice. As an example, when the transmission opportunity is 2-symbol granularity, the 2-symbol granularity may be repeated twice (2+2). As an example, when the transmission opportunity is 4-symbol granularity, the 4-symbol granularity may be repeated twice (4+4). As an example, when the transmission opportunity is 7-symbol granularity, the 7-symbol granularity may be repeated twice (7+7).

[0319] The reason why the total number of repeated transmissions can be defined according to the number of TCI states configured / indicated as in the example is that repeated transmissions exceeding the number of configured / indicated TCI states can be replaced by a mini-slot structure consisting of more symbols. In the above description, a "mini-slot structure" may refer to a scheduling structure having a granularity of 2, 4, 6, or 7 symbols, which may be indicated by PDSCH mapping type B.

[0320] When the number of configured / indicated TCI states and the number of repeated transmissions are represented as x and y, respectively, the case where x is greater than y can be regarded as a case where repeated transmissions exceed the number of configured / indicated TCI states.

[0321] For example, when the number of configured / indicated TCI states is 2 and the micro-time slot with a structure of 2 symbols is repeated four times, a 2+2+2+2 structure is provided, and this can be replaced by repeating the micro-time slot with a structure of four symbols twice. That is, (in terms of considering DMRS overhead), the scheme of repeating the micro-time slot with a structure of the fourth symbol twice can be more effective than the scheme of repeating the micro-time slot with a structure of two symbols four times. Since the number of configured / indicated TCI states in this example is 2, when the TCI state is repeated four times, the same TCI state is repeatedly shown. However, when it is repeated twice by using a larger micro-time slot structure, the advantage is that the same TCI state is not repeated, and the DMRS overhead can be minimized. Similar to this example, even in the case where the number of configured / indicated TCI states is 4 and the micro-time slot with a structure of 2 symbols is repeated eight times, the 2+2+2+2+2+2+2+2+2 structure can also be similarly replaced with a 4+4+4+4 structure.

[0322] Therefore, as described in this example, the number of repeated transmissions exceeding the number of configured / indicated TCI states can be replaced with a mini-slot structure having another number of symbols, and as a result, capacity enhancement can be expected by reducing the effect of DMRS overhead.

[0323] In summary, the number of repeated transmissions can be indicated by the number of TCI states indicated to the UE. That is, the number of repetitions of the transmission opportunity can be determined based on the number of TCI states corresponding to the code points of the TCI field in the DCI. For example, when 2 TCI states are indicated to the UE, the total number of transmission opportunities can be 2 and two repeated transmissions can be performed, and when 4 TCI states are indicated, the total number of transmission opportunities can be 4 and four repeated transmissions can be performed. In addition, the QCL assumption for each transmission opportunity can sequentially apply the TCI states indicated to the UE. For example, the transmission opportunities can be mapped sequentially in a manner such that the first transmission opportunity is mapped to the first TCI state and the second transmission opportunity is mapped to the second TCI state.

[0324] Meanwhile, Scheme 4 (TDM) may refer to repeated transmission at a time slot granularity. In Scheme 4, n (n <= Nt2) TCI states may be indicated in K (n <= K) different time slots. Each transmission opportunity of a TB has one TCI and one RV. All transmission opportunities across K time slots use a common MCS and the same single or multiple DMRS ports. The RV / TCI states may be the same or different between (one or more) transmission opportunities.

[0325] Due to the feature of repeated transmission at the time slot granularity, the delay of scheme 4 cannot be made longer, so scheme 4 is preferred to be used for increasing reliability rather than delay. In this case, since reliability can be enhanced by increasing the received SNR through repeated transmission, a larger number of repeated transmissions than the number of indicated TCI states can be considered.

[0326] Therefore, in the case of scheme 4, the number of repetition transmissions may be configured by higher layer signaling (e.g., RRC / MAC CE). For example, a higher layer parameter (e.g., repetitionnumber) for configuring the number of repetition transmissions may be defined, and the number of repetition transmissions may be configured by the corresponding parameter. As an example, the number of repetition transmissions may be configured to be one of 2, 3, 4, 5, 6, 7, 8, or 16.

[0327] Alternatively, even in the case of Scheme 4, a method in which the BS dynamically indicates the number of repeated transmissions to the UE may be considered. In this case, there is an advantage that the signaling method defined for M-TRP-based URLLC, such as Scheme 3, can be utilized as is, and there is an advantage that even for Scheme 4, the number of repetitions can be dynamically adjusted by considering various service types, and therefore, the delay can be adjusted according to a specific service type. As a signaling method for dynamically indicating the number of repeated transmissions for the case of Scheme 4 to the UE, the following suggestion can be adopted.

[0328] The BS may configure the UE with information related to the number of repeated transmissions applicable to Scheme 4 through higher layer signaling (e.g., RRC / MAC CE). For example, (one or more) candidate values ​​for the applicable number of repeated transmissions may be indicated. Alternatively, (one or more) candidate values ​​for the number of repeated transmissions fixed or predefined between the BS and the UE may be defined. The candidate value may refer to some / all values ​​that the BS configures to the UE through higher layer signaling based on a pre-configured / defined commitment / rule / condition in the number of repeated transmissions applicable to the above-mentioned Scheme 4.

[0329] The BS may explicitly or implicitly select a specific value among (one or more) candidate values ​​of the number of repeated transmissions that may be indicated to the UE through a specific field in the DCI. The specific field in the DCI may be a field newly defined for the number of repeated transmissions or a conventional field (e.g., a TCI status field, (one or more) antenna port fields, an MCS field, an NDI field, an RV field, etc.).

[0330] For example, when the number of repeated transmissions applicable to the above-mentioned scheme 4 is configured to the UE through higher layer signaling, it can be assumed that {2, 4, 8, 16} is defined as the applicable number of repeated transmissions. {2, 4, 8, 16} is only an example of a candidate value for the number of repeated transmissions and does not limit the technical scope of the present disclosure. Therefore, the number of repeated transmissions can be configured to another value (e.g., 2, 3, 4, 5, 6, 7, 8, 16, etc.). Alternatively, a certain number of transmissions in the value can be configured to the UE through higher layer signaling, as an example, a value such as {2, 8}. In addition, a specific value (e.g., {2, 8}) of the candidate value(s) can be indicated by a specific field in the DCI.

[0331] Hereinafter, an example of a method for dynamically indicating the number of repeated transmissions through a specific field in DCI will be described.

[0332] Example 1) The number of repeated transmissions can be indicated by using the TCI status field in the DCI.

[0333] For example, the number of repetition transmissions may be mapped to a code point of the TCI status field, and the BS may indicate a specific number of repetition transmissions to the UE by / using the code point value indicated to the UE through the TCI status field. As a specific example, the number of repetitions corresponding to {2} may be mapped to a value corresponding to a code point of the TCI status field of 0 (i.e., 000) to 3 (i.e., 011), and the number of repetitions corresponding to {8} may be mapped to a value corresponding to a code point of 4 (i.e., 100) to 7 (i.e., 111). For example, a mapping relationship between a code point and a number of repetitions may be predefined between the UE and the BS.

[0334] As another example, a method for indicating whether to perform repeated transmissions corresponding to the relevant specific number of repetitions through a specific field in the DCI after the specific number of repetitions is configured to the UE through higher layer signaling may also be considered. For example, the number of repetitions corresponding to {2} may be configured through higher layer signaling, and whether repeated transmissions corresponding to the relevant number of repetitions are performed may be indicated by a code point of a specific TCI status field. For example, whether repeated transmissions corresponding to the relevant number of repetitions (e.g., 2) may be enabled through a code point of a specific TCI status field. In addition, as in the following example, information about whether repeated transmissions are being performed may also be indicated by a specific field in the DCI.

[0335] Example 2) The modulation and coding scheme (MCS) / new data indicator (NDI) / redundancy version (RV) field of the second transport block (TB) for DCI may be used. For example, different numbers of repetition transmissions may be mapped to code points corresponding to the MCS, NDI, and RV fields for the second TB, and the BS may indicate a specific number of repetition transmissions to the UE through the relevant fields.

[0336] Example 3) The (one or more) antenna port field of the DCI may be used. Even in Example 3, it is assumed that a value such as {2,8} is configured to the UE through higher layer signaling. For example, a specific number of repetitions may be indicated based on a rank value (e.g., (one or more) DRMS ​​port numbers) or / and the number of CDM groups or / and the index of the CDM group indicated by the (one or more) antenna port field.

[0337] As an example, when the rank value is equal to or less than a specific value (and / or a preconfigured / defined value), a smaller value (e.g., {2}) of the number of repetitions (e.g., {2,8}) configured by higher layer signaling may be indicated. Conversely, when the rank value is greater than a specific value, a larger value (e.g., {8}) of the number of repetitions (e.g., {2,8}) configured by higher layer signaling may be indicated.

[0338] As an example, when the number of indicated CDM groups is 2 or more, that is, when the indicated (one or more) DMRS ports are included in different CDM groups, a smaller number of repetitions (e.g., {2, 8}) configured by higher layer signaling may be indicated, and when the number of indicated CDM groups is 1, that is, when the indicated (one or more) DMRS ports are included in the same CDM group, a larger number of repetitions may be indicated. Alternatively, when the number of indicated CDM groups is 2 or more, that is, when the indicated (one or more) DMRS ports are included in different CDM groups, a larger number of repetitions may be indicated, and when the number of indicated CDM groups is 1, that is, when the indicated (one or more) DMRS ports are included in the same CDM group, a smaller number of repetitions may be indicated.

[0339] As an example, when the indicated CDM group index is 0, that is, when the indicated (one or more) DMRS port is included in CDM group 0, a smaller repetition number may be indicated, and when the indicated CDM group index is 1, that is, when the indicated (one or more) DMRS port is included in CDM group 1, a larger repetition number may be indicated. Alternatively, when the indicated CDM group index is 0, that is, when the indicated (one or more) DMRS port is included in CDM group 0, a larger repetition number may be indicated, and when the indicated CDM group index is 1, that is, when the indicated (one or more) DMRS port is included in CDM group 1, a smaller repetition number may be indicated.

[0340] Example 4) Example 4 is another example of using (one or more) antenna port fields. When the DMRS antenna port index is indicated to the UE through the (one or more) antenna port field, the number of repeated transmissions is jointly encoded to indicate the number of repeated transmissions to the UE jointly with the DMRS antenna port.

[0341] Table 9 shows an example of jointly encoding and indicating the number of repetition transmissions corresponding to the DMRS antenna port. Table 9 is merely an example for convenience of description and does not limit the technical scope of the present disclosure, and it is obvious that Table 9 can be extended to another form by applying the features of the proposed method described in the present disclosure. For example, a DMRS port corresponding to each value of a code point that can be indicated by the antenna port field can be predefined, and the number of repetition transmissions can be additionally predefined / configured to correspond to each code point in conjunction with the DMRS port.

[0342] [Table 9]

[0343]

[0344] In Table 9, an example of (one or more) antenna port fields defined in the current standard is shown on the left (see TS38.212 Table 7.3.1.2.2-1). An example of (one or more) enhanced antenna port fields to which the proposed method of the present disclosure is applied is shown on the right. Referring to Table 9, in the right table, values ​​9, 10, and 12 to 15 are newly added parts, and the example of the enhanced DMRS table may have the following features.

[0345] First, the total number of transport layers can be limited. Since high throughput is not required in URLLC operation, a large number of transport layers may not be supported. Therefore, the number of transport layers can be newly defined to be limited to a specific value or less, and the code point indicating the value exceeding the relevant number of layers indicates another value. In the example of the DMRS table, the values ​​corresponding to the values ​​9 and 10 are initially defined to be able to indicate (one or more) DMRS port combinations of 3 and 4 layers, but can be defined to correspond to another value by applying the number of transport layers limited to a specific value (e.g., 2) or less.

[0346] Secondly, a specific code point of the relevant field can be mapped to a specific number of repeated transmissions. In the example of the enhanced DMRS table, k1 and k2 can correspond to a specific number of repeated transmissions. k1 and k2 can be values ​​configured by higher layer signaling or values ​​defined by fixed rules between the BS and the UE. In the example of the DMRS table, values ​​3, 4, 5, 6, 7 and 8 and values ​​9, 10, 12, 13, 14 and 15 indicate the same DMRS port index and CDM group number ('the number of (one or more) DMR CDM groups without data'), but there is a feature that each number of repeated transmissions is different from k1 or k2.

[0347] Although not applied in the example of the DMRS table, the number of CDM groups may also be limited to a specific value in order to support new more combinations for DMRS ports and repetition transmission times. For example, when only 2 is limited to be supported as the number of CDM groups in the above example 4, values ​​corresponding to 0, 1, and 2 may correspond to new combinations.

[0348] Example 5) proposes another example of using the antenna port field of DCI. A specific number of repetitions may be indicated based on the index of the DMRS antenna port(s) indicated by the antenna port field(s).

[0349] For example, a specific number of repetition transmissions may be mapped to a specific DRMS ​​antenna port or DMRS antenna port (ie, a DMRS antenna port group).

[0350] Table 10 shows an example of mapping and configuring the number of repetition transmissions for each DMRS antenna port. That is, Table 10 shows an example in which different numbers of repetition transmissions are mapped to different DMRS antenna ports. Table 11 shows an example of mapping and configuring the number of repetition transmissions for each DMRS antenna port group. That is, Table 11 shows an example of mapping different numbers of repetition transmissions by a group granularity consisting of multiple DMRS antenna ports.

[0351] [Table 10]

[0352]

[0353] [Table 11]

[0354]

[0355] In the examples of Tables 10 and 11, k1 to k12 refer to different numbers of repeated transmissions. In this case, some values ​​of k1 to k12 may correspond to the same value. The number of repeated transmissions (values ​​of k1 to k12) may be configured to the UE through higher layer signaling, or a specific value may be defined by a fixed rule between the BS and the UE.

[0356] With reference to Table 10, different repetition transmission times may be indicated according to the DMRS port index indicated to the UE. For example, when Table 10 is assumed, in the case where DMRS port 0 is indicated to the UE, the repetition transmission times corresponding to k1 may be indicated, and in the case where DMRS port 1 is indicated, the repetition transmission times corresponding to k2 may be indicated.

[0357] Referring to Table 11, the number of repetition transmissions can be mapped and configured by group granularity, and the same number of repetition transmissions can be mapped to DMRS antenna ports in the same group. As an example, in Table 11, DMRS ports 0 and 1 can be configured as a group, and the number of repetition transmissions k1 can be configured in the relevant group.

[0358] In the example of Table 11 above, each group is composed of the same DMRS port number (eg, 2), but a different DMRS port number may be configured for each group. Even in this case, the same number of repeated transmissions may be configured in the DMRS ports in the same group.

[0359] Meanwhile, when multiple DMRS ports are indicated to the UE, the UE may assume the number of repetition transmissions corresponding to a specific DMRS port (if the number of repetition transmissions corresponding to the DMRS port is different). For example, it may be defined to follow the number of repetition transmissions corresponding to a higher or lower index. As an example, when DMRS ports 0 and 1 are indicated and defined as corresponding to a lower index, the number of repetition transmissions k1 corresponding to DMRS port 0 may be indicated.

[0360] In addition to this proposal, a method for indicating different repetition transmission times according to the order of DMRS port indexes in the same CDM group can also be considered. That is, different repetition transmission times can be configured for DMRS ports in the same CDM group respectively. This can also be interpreted as mapping a specific repetition transmission number to a DMRS antenna port group composed of DMRS antenna ports included in different CDM groups. In other words, DMRS ports in which the same repetition transmission number is configured can correspond to different CDM groups.

[0361] Table 12 shows an example of mapping different repetition transmission times according to the order of DMRX port indexes in the same CDM group. Table 12 is merely an example for convenience of description and does not limit the technical scope of the present disclosure.

[0362] [Table 12]

[0363]

[0364] In the example of Table 12, k1 to k4 refer to different numbers of repeated transmissions. In this case, some values ​​of k1 to k4 may correspond to the same value. The number of repeated transmissions (e.g., values ​​k1 to k12) may be configured to the UE through higher layer signaling or a specific value may be defined by a fixed rule between the BS and the UE.

[0365] Referring to Table 12, different repetition transmission times may be indicated based on the DMRS port index indicated to the UE according to the order in the CDM group including the relevant DMRS port. In other words, repetition transmission times k1 to k4 may be configured / defined, and may correspond to k1 to k4 in sequence based on the indication order of the DMRS port, respectively. For example, when assuming DMRS configuration type 1, when DMRS port 0 is indicated to the UE, the repetition transmission times corresponding to k1 may be indicated, and when DMRS port 4 is indicated, the repetition transmission times corresponding to k3 may be indicated.

[0366] Meanwhile, when multiple DMRS ports are indicated to the UE, the UE may assume the number of repetition transmissions corresponding to a specific DMRS port (if the number of repetition transmissions corresponding to the DMRS port is different). For example, it may be defined to follow the number of repetition transmissions corresponding to a higher or lower index. As an example, when DMRS ports 0 and 1 are indicated and defined as corresponding to a lower index, the number of repetition transmissions k1 corresponding to DMRS port 0 may be indicated.

[0367] When different numbers of repeated transmissions are indicated according to the order of DMRX port indexes in the same CDM group as in the above-described example, there may be the following advantages.

[0368] When considering the case of multi-user (MU) pairing assuming Scheme 3 or Scheme 4, it is more natural for a small number of UEs to be MU paired than for a large number of UEs to be MU paired. The reason is that MU pairing is mainly used for the purpose of increasing the data transmission rate by sending data to multiple UEs at the same time, and to this end, it should be possible to apply precoding orthogonal to different UEs in order to prevent interference between UEs. However, in the case of URLLC, it is preferred to minimize interference with another UE, and in addition, in order to reduce latency time, emergency data transmission can be performed, and in this case, it may be difficult and unpreferable to find a UE with precoding orthogonality in a short time. Therefore, when it is assumed that a small number of UEs are MU paired, different UEs can be supported by (one or more) DMRS ports included in different CDM groups. The reason is that the interference between DMRS ports based on FDM multiplexing is expected to be less than the interference between DMRS ports based on CDM multiplexing during channel estimation.

[0369] When assuming that different UEs are supported by (one or more) DMRS ports included in different CDM groups, it should be possible to indicate different numbers of repetition transmissions to each UE through (one or more) DMRS ports in the same CDM group. For example, when the maximum number of DMRS symbols is 1 and DMRS type 1 is assumed, DMRS ports 0 and 1 and DMRS ports 2 and 3 are included in CDM groups 0 and 1, respectively. In this case, when DMRS ports 0 and 1 correspond to the same number of repetition transmissions and DMRS ports 2 and 3 correspond to the same number of repetition transmissions, there is no method that can indicate different numbers of repetition transmissions to different corresponding UEs. Therefore, it can be considered that it is preferred that different numbers of repetition transmissions correspond to (one or more) different DMRS ports in the same CDM group. Therefore, according to the proposed method, different numbers of repetition transmissions can be mapped according to the order of DMRS port indexes in the same CDM group, and a specific number of repetition transmissions can be indicated according to the DMRS port index indicated to the UE.

[0370] Table 13 shows another example, in which different repetition transmission times are mapped according to the order of DMRX port indexes in the same CDM group according to the method proposed in the present disclosure. Table 13 is only an example for convenience of description and does not limit the technical scope of the present disclosure.

[0371] [Table 13]

[0372]

[0373] When comparing the example of Table 13 with Table 12, there is a feature that the number of repetition transmissions corresponding to the DMRS ports included in CDM group 1 is different. This has the following features: when multiple DMRS ports are indicated to the UE, the UE can assume the number of repetition transmissions corresponding to a specific DMRS port (if the number of repetition transmissions corresponding to the DMRS port is different), and indicate different numbers of repetition transmissions by a combination of DMRS ports included in different CDM groups. For example, when it is defined that the number of repetition transmissions corresponding to a higher or lower index is to be followed, different numbers of repetition transmissions can be configured by a combination of DMRS ports included in different CDM groups.

[0374] For example, when it is defined that Table 12 is to be followed and the number of repetition transmissions corresponding to the small DMRS port is to be followed, the number of repetition transmissions corresponding to k1 may be indicated for each of the combination of DMRS ports 0 and 1 and the combination of DMRS ports 2 and 3. On the contrary, when the above Table 13 is assumed, the number of repetition transmissions corresponding to k1 may be indicated for DMRS ports 0 and 1, and the number of repetition transmissions corresponding to k2 may be indicated for DMRS ports 2 and 3.

[0375] Meanwhile, in addition to the matters given in the examples of Tables 10, 11, 12, and 13, the number of repeated transmissions corresponding to each DMRS port may be defined differently according to the maximum number of symbols ("maxLength") of the DMRS configured to the UE.

[0376] Table 14 shows an example of differently defining the number of repeated transmissions corresponding to each DMRS port according to the maximum symbol number of the DMRS by assuming the above Table 13. Table 14 is merely an example for convenience of description and does not limit the technical scope of the present disclosure.

[0377] [Table 14]

[0378]

[0379] Referring to Table 14, the number of repetition transmissions corresponding to the DMRS port may be defined differently for a case where the maximum symbol number is 1 (ie, maxLength=1) and a case where the maximum symbol number is 2 (ie, maxLength=2), respectively.

[0380] In the case where the maximum symbol number is 1, in the case of 1-layer transmission, the number of repetition transmissions corresponding to k1 and k2 can be indicated respectively by using DMRS ports in different CDM groups, and in the case of 2-layer transmission, k1 and k2 can be indicated by using the (0,1) combination and the (2,3) combination, respectively, assuming that the number of repetition transmissions corresponding to the small DMRS port is followed. On the contrary, in the case where the maximum symbol number is 2, in the case of 1-layer transmission, the number of repetition transmissions corresponding to k1, k2, k3 and k4 can be indicated respectively by using DMRS ports in different CDM groups, and k1 and k2 can be indicated by using the (0,1) combination and the (4,5) combination, respectively, assuming that the number of repetition transmissions corresponding to the small DMRS port is followed, and k1 and k2 can be indicated by using the (2,3) combination and the (6,7) combination, respectively.

[0381] That is, in this example, there are the following features: when the maximum symbol number of DMRS is 1, different numbers of repeated transmissions can be indicated by DMRS port combinations in different CDM groups during 2-layer transmission, and when the maximum symbol number is 2, different numbers of repeated transmissions can be indicated by DMRS port combinations in the same CDM group during 2-layer transmission.

[0382] When comparing Table 13 and Table 14, the number of repetition transmissions corresponding to k1, k2, k3, and k4 can be indicated at 2-layer transmission, and therefore, there can be an advantage that more different numbers of repetition transmissions can be indicated when one UE is assumed. Meanwhile, in the case of Table 14, the number of repetition transmissions corresponding to k1 and k2 can be indicated at 2-layer transmission, but the same number of repetition transmissions can be indicated in each CDM group in different CDM groups, and therefore, there can be an advantage that independent numbers of repetition transmissions can be indicated to different UEs when MU pairing is considered.

[0383] Since the method and / or embodiments (e.g., Examples 1 to 5) can be applied to the case where repeated transmission is intended to be performed in the time domain as described above, it is obvious that Scheme 3 and / or Scheme 4 are applicable. In addition, the method and / or embodiments (e.g., Examples 1 to 5) can be an example of a method applicable to Proposal 2 and are not limited to (one or more) examples. In addition, it is obvious that (one or more) another embodiment can be applied based on the features of the proposed method. In addition, the method and / or embodiments (e.g., Examples 1 to 5) can be applied independently, or can also be applied as a method in the form of combining multiple proposed methods.

[0384] The number of repetition transmissions of a transmission opportunity may be configured based on the method and / or embodiment (eg, Examples 1 to 5). That is, the number of multiple transmission opportunities received by the UE is known.

[0385] <Proposal 2-1>

[0386] The method and / or embodiment (eg, Examples 1 to 5) may also be used as a method for indicating the number of shifted symbols between different transmission opportunities in the case of Scheme 3.

[0387] In the case of scheme 3, the shift symbol between different transmission opportunities may refer to the degree to which different transmission opportunities are separated from each other.

[0388] Fig.11 An example of the configuration of shifted symbols between transmission opportunities is illustrated.

[0389] refer to Fig.11 According to Definition 1, the shift symbol may refer to the number of symbols from the last symbol of the first transmission opportunity until the first symbol of the second transmission opportunity. In this case, the shift symbol may also be replaced and represented by a gap symbol. For example, the shift symbol (gap symbol) may also be interpreted as the gap between the first transmission opportunity and the second transmission opportunity. According to Definition 2, the shift symbol may refer to the number of symbols from the first symbol of the first transmission opportunity until the first symbol of the second transmission opportunity. In the following description, the shift symbol will be described according to Definition 1. However, this is merely for ease of description and does not limit the scope of the present disclosure. Therefore, this applies even to the case according to Definition 2.

[0390] In the case of Scheme 3, the reason why the symbols are shifted is to support repeated transmission in one slot even when the DL / UL symbol changes in one slot.

[0391] Table 15 shows a partial example of a slot format for a normal CP (see Table 11.1.1-1 of TS 38.213). Referring to Table 15, symbols for DL ​​(D) and UL (U) may be repeatedly configured in one slot.

[0392] [Table 15]

[0393]

[0394]

[0395] Fig.12 An example of transmission timing repeatedly transmitted in one time slot is shown in the figure. Fig.12 It is only for the convenience of description and does not limit the technical scope of the present disclosure.

[0396] Fig.12An example of applying repeated transmission to a time slot format corresponding to the value 49 in Table 15 above is illustrated. Fig.12 , case 1 shows an example of repeated transmission when DL / UL symbol changes are not considered in one slot. In this case, a problem arises in that the second transmission opportunity may not be transmitted when overlapping with a symbol for actual UL transmission. In contrast, case 2 shows an example of performing repeated transmission only in a symbol for DL ​​transmission by considering a DL / UL symbol change in one slot. When the BS intends to perform repeated transmission by considering a DL / UL symbol change in one slot, the BS needs to notify the UE of the number of shifted symbols between different transmission opportunities.

[0397] For example, the number of shift symbols between different transmission opportunities can be configured based on the method and / or embodiment (e.g., Examples 1 to 5). As an example, the number of shift symbols (gap symbols) can be configured by higher layer signaling. As an example, the number of shift symbols can also be configured by using a newly defined field or a conventional field (e.g., TCI status field, (one or more) antenna port fields, MCS field, NDI field, RV field, etc.) for configuring the number of shift symbols in the DCI. As an example, the number of repeated transmissions can be replaced by the number of shift symbols and explained in the method and / or embodiment (e.g., Examples 1 to 5).

[0398] <Proposal 2-2>

[0399] The method and / or embodiments (eg, Examples 1 to 5) may also be used as a method of indicating different RV values ​​for different transmission occasions in the case of Scheme 2b / 3.

[0400] In the case of scheme 2b / 3, for different RV values ​​at different transmission occasions, the value of the first RV field indicated to the UE may indicate the RV value of the first transmission occasion, and for the RV value of the second transmission occasion, the difference value and / or the actual RV value and / or RV combination-related indication information may be separately signaled based on the value indicated as the first RV field. The following method may be an example of a method for indicating the difference value and / or the actual RV value and / or the RV combination-related indication information of the RV value.

[0401] Hereinafter, a method for indicating RV-related information for each transmission opportunity in time domain repeated transmission is proposed. For ease of description, an example of a case where two TRPs (e.g., TRP 1 and TRP 2) perform coordinated transmission is mainly described, but the scope of the present disclosure is not limited. Therefore, of course, the method can even be applied to a case where three or more TRPs perform coordinated transmission. In addition, M-TRP operation based on a single DCI is assumed and described.

[0402] In the example of Proposal 2-2, it is assumed that the first transmission opportunity corresponds to TRP1 and the second transmission opportunity corresponds to TRP2. Here, different transmission opportunities can be interpreted as different (transmission) resource regions corresponding to different TRPs.

[0403] With respect to methods and / or embodiments (e.g., Examples 1 to 5), different RV values ​​may be indicated for transmission resource regions corresponding to different TRPs. This is because independent coded bits may correspond to corresponding transmission resource regions corresponding to different TRPs. When different RV values ​​may be indicated to independent coded bits corresponding to different TRPs, there may be an advantage that the most appropriate RV combination may be indicated according to the channel environment.

[0404] For example, when there is a difference in path loss between different channels corresponding to different TRPs, more parity bits can be sent by indicating a combination of self-decodable RVs (e.g., 0 and / or 3) and non-self-decodable RVs (e.g., 1 and / or 2 and / or 3), and robust channel coding can be applied. On the contrary, when the difference in path loss between different channels corresponding to different TRPs is large or a blocking environment is taken into consideration, the self-decodable RV is mapped to all different TRPs to receive self-decodable coded bits even in one TRP among different TRPs, thereby enhancing the reception capability of the UE.

[0405] In the present disclosure, "self-decodable RV" may refer to a decodable RV value by receiving a single coded bit due to an inefficient coding rate, and "non-self-decodable RV" may refer to an RV value that is difficult to decode by receiving a single coded bit due to an efficient coding rate. In the present disclosure, a "blocked environment" may refer to a channel environment in which the received SNR from a related TRP is very low because the channel from a specific TRP becomes weak. The "coded bit" mentioned in the present disclosure may also be referred to as a codeword (CW).

[0406] The following method may be applied so as to indicate different RV values ​​to respective coded bits corresponding to transmission resource regions corresponding to different TRPs. Hereinafter, a method for configuring an RV value corresponding to each transmission opportunity will be described in detail.

[0407] Method 1: An RV value (e.g., a first RV value) may be indicated by an RV field of DCI, and a difference from the RV value (e.g., the first RV value) may be indicated. Method 1 is a method for indicating an actual different value (e.g., α) compared to x when it is assumed that the RV value indicated by the first RV field (e.g., the first RV value) is x. For example, when X is indicated by an RV value based on the first RV field and α is indicated, the RV value of the second transmission opportunity may be determined as X+α. For example, when it is assumed that x is 0, if the difference indicates 3, the RV value of the first transmission opportunity corresponds to 0, and the RV value of the second transmission opportunity corresponds to 3.

[0408] Method 2: A method for indicating a difference value in a related order after defining a specific RV order may be considered. For method 2, first, multiple RV values ​​need to be defined in a specific order. To this end, an RV order for retransmission may be used. For example, the order of RV values ​​may be defined in the order of 0, 2, 3, and 1. In addition, when the RV value indicated by the first RV field is x, it may be cyclically indicated based on x that the related RV value is which RV value. For example, when 0 is indicated as the RV value of the first transmission opportunity and 3 is indicated as the difference value, the RV value of the second transmission opportunity corresponds to 1 positioned in the order of three steps after 0.

[0409] Method 3: Multiple RV values ​​(e.g., a first RV value and a second RV value) may be indicated by the RV field of the DCI. That is, in addition to the RV value (e.g., the first RV value) indicated by the first RV field, another RV value (e.g., the second RV value) to be actually applied may also be indicated according to method 3.

[0410] Method 4: Method for indicating RV combination

[0411] A method for indicating different RV values ​​to transmission resource areas corresponding to different TRPs may be considered. That is, a method for indicating RV combinations for different transmission opportunities (e.g., first transmission opportunity / second transmission opportunity) may also be considered. Here, different transmission opportunities may be interpreted as different (transmission) resource domains corresponding to different TRPs.

[0412] The RV value of the coded bits sent through a specific (transmission) resource region corresponding to a specific TRP among multiple TRPs, and the RV value of the coded bits sent through a specific resource region corresponding to other TRPs other than the specific TRP can be fixed / configured (e.g., RRC signaling and / or MAC-CE signaling) to a specific value (i.e., a default value, such as 0).

[0413] For example, when two TRPs are configured, the RV value for one TRP (e.g., TRP 1) can be dynamically indicated by the RV field in the DCI, and the RV value for another TRP (e.g., TRP 2) other than the relevant TRP can be fixed to a specific value or configured by higher layer signaling. In addition, for example, when three or more TRPs are configured, the RV value of one TRP among the multiple TRPs can be dynamically indicated by the RV field in the DCI, and the RV value for RPs other than a specific TRP can be fixed to (one or more) specific values ​​or configured by high layer signaling. In this case, the (one or more) specific values ​​can be fixed / configured to the same value for all TRPs, or fixed / configured to a separate value for each TRP.

[0414] As an example, in the proposal, the "specific resource region corresponding to a specific TRP" may be a resource region corresponding to a first TCI state (e.g., TCI state #0) and / or CW #0 and / or a first TB field. "First" may be an example and may be replaced with another specific value such as second. That is, the specific resource region corresponding to a specific TRP may be a resource region corresponding to a specific TCI state, a specific CW and / or a specific TB field. The relevant specific value may be fixed as a (pre) fixed value between the BS and the UE, or the BS may also configure the relevant specific value to the UE through higher layer signaling (e.g., RRC / MAC-CE) and / or DCI signaling. When the proposal is applied, an example of a RV combination that may be indicated to each of TRPs 1 and 2 (i.e., corresponding to the coded bits corresponding to the resource region corresponding to each TRP) may be shown in Table 16.

[0415] Table 16 shows an example of RV combinations corresponding to each TRP. In the example of Table 16, the RV value of TRP 2 can be fixed / configured to 0 or another value (e.g., 1 / 2 / 3). As an example, another value can be configured through higher layer signaling.

[0416] [Table 16]

[0417]

[0418] When the described method 4 is applied, the following advantages can be obtained. First, different RV combinations for different TRPs can be indicated by a single specific RV field in the DCI. Second, a specific TRP in different TRPs can continuously send coded bits of self-decodable RVs. As an example, when the above method 4 is applied, in an environment where the path loss difference between different channels corresponding to different TRPs is small, a combination of self-decodable RVs and non-self-decodable RVs can be indicated. On the contrary, in an environment where the path loss difference is large or congestion may occur, a combination of self-decodable RVs and self-decodable RVs can be indicated. Thus, there is a technical effect of being able to dynamically indicate a robust (i.e., optimized) RV combination according to the channel environment.

[0419] In addition, in combination with the above-mentioned method 4, a method for indicating an RV combination consisting of multiple RV values ​​through the RV field in the DCI may also be considered. When such a method is applied, there may be a feature that the RV field may correspond to multiple RV values, which is different from the case in which the RV field in the conventional standard corresponds to a specific RV value.

[0420] Table 17 illustrates an example in which a combination of multiple RV values ​​is indicated / configured. Table 17 is merely an example for convenience of description and does not limit the technical scope of the present disclosure.

[0421] [Table 17]

[0422]

[0423] Referring to Table 17, the RV value (or index) can be indicated by the RV field in the DCI, and multiple RV values ​​can be mapped to each RV value. In other words, the mapping relationship of multiple RV values ​​can be predefined for each code point of the RV field of the DCI, and the RV value corresponding to each TRP can be determined based on the value indicated by the DCI.

[0424] As in the example of Table 17, when a method of indicating an RV combination consisting of multiple RV values ​​is applied, there may be a feature that the value indicated by the RV field is different from the RV value to be actually applied. The RV combination corresponding to each RV field may be defined as a fixed value between the BS and the UE, and a specific RV combination may be configured to the UE through higher layer signaling and / or DCI signaling.

[0425] Method 5: Method for indicating the mapping relationship between RV combination and TRP

[0426] According to the above-mentioned method 4, there may be an advantage that different RV values ​​can be indicated to different coding bits corresponding to different TRPs. "Different coding bits corresponding to different TRPs" can be interpreted as different coding bits corresponding to different TCI states. At the same time, the above-mentioned method 4 has the feature that the RV combination indicated by a specific RV field is fixed in a specific order. For example, according to method 4, 3 can be indicated to the coding bit corresponding to the first TRP through the RV field in the DCI, and 0 can be indicated to the coding bit corresponding to the second TRP, but on the contrary, 0 and 3 may not be indicated.

[0427] This restriction may have the following disadvantages: when the BS indicates the RV order differently according to the channel state between the TRP and the UE, the combination of the TCI states is the same, but the respective code points having different orders should be defined in the TCI state field, and as a result, the efficiency of the TCI state field becomes poor. For example, when each of code point 0 corresponding to {TCI state A, TCI state B} and code point 1 corresponding to {TCI state B, TCI state A} of the TCI field is defined, the combination of {2,0} and {0,2} can be indicated to the coded bits corresponding to TCI state A and the coded bits corresponding to TCI state B by code point 0 and code point 1, respectively (in method 4, it is assumed that 2 is indicated in the RV field).

[0428] In order to overcome this shortcoming, a method capable of changing the order of TRPs (or the order of TCI states) corresponding to different RVs may be considered.

[0429] Method 5-1) may indicate specific mapping order related information based on the index of the CDM group including the (one or more) DMRS ports indicated by the (one or more) antenna port field in the DCI (for example, see the antenna port related table of TS38.212 DCI format 1-1). That is, different mapping orders may be indicated according to the index of the CDM group. As an example, when the indicated CDM group index is 0, that is, when the indicated (one or more) DMRS ports are included in CDM group 0, the first RV value in the RV combination indicated to the UE (for example, the RV combination configured by the BS in method 4) may be applied to the coded bits corresponding to the first TCI state, and the second RV value may be applied to the coded bits corresponding to the second TCI state. On the contrary, when the indicated CDM group index is 1, that is, when the indicated (one or more) DMRS ports are included in CDM group 1, the first RV value in the RV combination indicated to the UE may be applied to the coded bits corresponding to the second TCI state, and the second RV value may be applied to the coded bits corresponding to the first TCI state. Alternatively, the opposite situation is also possible.

[0430] Method 5-2) may use the modulation and coding scheme (MCS) / new data indicator (NDI) field of the second transport block (TB) for DCI. For example, different mapping orders may be indicated by 1 bit of the MCS / NDI field.

[0431] Method 5-3) The specific mapping order related information may be indicated based on (one or more) DMRS antenna port indexes through (one or more) antenna port fields in the DCI.

[0432] For example, specific mapping order related information may be mapped to a specific DRMS ​​antenna port or DMRS antenna port (DMRS antenna port group).

[0433] Table 18 shows an example of mapping specific mapping order related information to a specific DMRS antenna port, and Table 19 shows an example of mapping specific mapping order related information to a specific DMRS antenna port group. A DMRS antenna port group may consist of a plurality of DMRS antenna ports.

[0434] [Table 18]

[0435]

[0436] [Table 19]

[0437]

[0438] In the examples of Table 18 and Table 19, k1 to k12 may refer to different mapping order related information. In this case, some of the values ​​of k1 to k12 may correspond to the same mapping order. The mapping order corresponding to the above k1 to k12 may be configured to the UE through higher layer signaling, or a specific mapping order may be defined by a fixed rule between the BS and the UE.

[0439] Referring to Table 18, different mapping order related information can be mapped to different DMRS antenna ports. In addition, referring to Table 19, different mapping order related information can be mapped by a group granularity consisting of multiple DMRS antenna ports. In the examples of Tables 18 and 19, different mapping order related information can be indicated according to the DMRS port index indicated to the UE. For example, when assuming Table 19, when DMRS port 0 is indicated to the UE, mapping order related information corresponding to k1 can be indicated (for example, the first RV is mapped to the first TCI state, and the second RV is mapped to the second TCI state), and when DMRS port 2 is indicated, mapping order related information corresponding to k2 can be indicated (for example, the second RV is mapped to the first TCI state, and the first RV is mapped to the second TCI state).

[0440] At the same time, when multiple DMRS ports are indicated to the UE, the UE may assume the mapping order related information corresponding to a specific DMRS port. For example, it may be defined that the mapping order related information corresponding to a higher or lower index is to be followed. As an example, when DMRS ports 0 and 1 are indicated and defined as corresponding to a lower index, the mapping order related information corresponding to k1 corresponding to DMRS port 0 may be indicated.

[0441] In addition, different mapping order information may also be indicated according to the DMRS port index in the same CDM group. In other words, specific mapping order related information may be mapped to a DMRS antenna port group consisting of DMRS antenna ports included in different CDM groups.

[0442] Table 20 shows an example of indicating different mapping order related information according to the order of DMRS port indexes through CDM group granularity.

[0443] [Table 20]

[0444]

[0445] In the example of Table 20, k1 to k4 refer to different mapping order related information. In this case, some values ​​of k1 to k4 may correspond to the same mapping order. The mapping order related information may be configured to the UE through higher layer signaling, or a specific mapping order may be defined by a fixed rule between the BS and the UE.

[0446] Referring to Table 20, different mapping order related information may be mapped according to the DMRS port index in the same CDM group. In other words, different mapping order related information may be indicated according to the order in the CDM group including the relevant DMRS port based on the DMRS port index indicated to the UE. For example, when assuming DMRS configuration type 1, in the case of indicating DMRS port 0 to the UE, mapping order related information corresponding to k1 may be indicated, and in the case of indicating DMRS port 4, mapping order related information corresponding to k3 may be indicated.

[0447] At the same time, when multiple DMRS ports are indicated to the UE, the UE can assume the mapping order related information corresponding to a specific DMRS port. For example, it can be defined to follow the mapping order related information corresponding to the higher or lower index. As an example, when DMRS ports 0 and 1 are indicated and defined as corresponding to the lower index, the mapping order related information corresponding to k1 corresponding to DMRS port 0 can be indicated.

[0448] Method 6:

[0449] In method 5 and method 5-1 / 5-2 / 5-3, a method is proposed that can indicate different mapping orders for a TCI state combination consisting of multiple TCI states defined in a specific code point of the TCI state field in the DCI and an RV combination indicated by the RV field. For example, when {TCI state A, TCI state B} is indicated by a specific code point of the TCI state field and {RV0, RV2} is indicated by the RV field, the mapping relationship between {TCI state A-RV0, TCI state B-RV2} or {TCI state A-RV2, TCI state B-RV0} can be determined by the CDM group index. That is, in this case, in order to apply different mapping orders between TCI states and RV values, additional information (e.g., CDM group index, DMRS port index, etc.) may be required.

[0450] Different from this, in addition to the proposed scheme, a method for defining a RV combination composed of the same RC value and having a different order in the RV field may also be applied. That is, a combination having a different mapping order autonomously between the TCI state and the RV value in the RV field may be configured / defined. In addition, it is obvious that even when the schemes of the above-mentioned method 5 and method 5-1 / 5-2 / 5-3 are not applied, the related method may be applied as a method for indicating different RVs in resource regions corresponding to different TCI states.

[0451] Table 21 shows an example of a method for indicating an RV combination according to Method 6 of the present disclosure.

[0452] [Table 21]

[0453]

[0454] In the example of the RV combination, the RV combinations corresponding to 01 and 10 as the values ​​of the RV field are {0,2} and {2,0}, respectively. As an example, an RV combination of {x,0} and {0,x} (e.g., a value of X={1,2,3}) in the RV field can be defined / configured. The combination has the following characteristics: the combination consists of the same RV value and has a different order. When the RV combination with this characteristic is jointly defined in the RV field, the BS has the advantage of being able to indicate RV combinations of different orders through the RV field according to the channel conditions of different TRPs. That is, the BS has the advantage of being able to configure and / or indicate an optimized RV combination by determining and considering the channel conditions of each TRP. For example, when TRP A has a better channel (e.g., a higher CQI) relative to TRP A / B (e.g., TRP A is mapped to the first TCI state and TRP 2 is mapped to the second TCI state), RV0 as a self-decodable RV can be indicated for TRPA, and RV2 can be indicated for TRP B.

[0455] There may be the RV combination of Table 22 as another example having the same purpose.

[0456] [Table 22]

[0457]

[0458] In the example of the RV combination, the RV combinations corresponding to 01 and 10 as the values ​​of the RV field are {0,2} and {3,0}, respectively. As an example, an RV combination of {x,0} and {0,y} in the RV field may be defined / configured (e.g., x=a value of {1,2,3}, and y=a value in [1,2,3] other than x). The difference from the previous RV combination is that the RV combination corresponding to 10 is not {2,0} but {3,0}. This example may have the advantage of being able to change the order in which the TRPs to which RV0, which is a self-decodable RV, is mapped, and the advantage of being able to define more various RV combinations.

[0459] Table 23 shows another example of RV combinations suitable for applying the schemes of Method 5 and Method 5-1 / 5-2 / 5-3 in addition to the proposal.

[0460] [Table 23]

[0461]

[0462] The reasons why the RV combination is suitable are as follows. First, the RV combination can be defined by considering a blocking environment in which a large path loss may occur fundamentally and a non-blocking environment in which blocking may not be considered. Therefore, by considering a blocking environment, the (0,0) combination should be defined as receiving a self-decodable RV (e.g., RV0) from a TRP in which blocking does not occur, even if blocking occurs. At the same time, by considering a non-blocking environment, a (0,2) combination should be defined. The reason is that it is expected that the (0,2) combination may have a lower effective channel coding rate due to increased redundancy in order to have excellent capabilities in most environments. The reason why RV combinations (2,2) and (1,3) should be defined based on the RV combination is to consider retransmission. In the case of the (0,0) combination, even if blocking occurs in a specific TRP of the two TRPs, RV0 and RV2 are received by the TRP in which blocking does not occur, so as to reduce the effective channel coding rate by the (2,2) combination in retransmission. Although it is assumed in this example that (RV0, RV0) and (RV2, RV2) are defined by applying RV0 and RV2, RV2 can be replaced with RV1 or RV3 in this example, and even in this case, similar characteristics and similar effects can be obtained (for example, in the above Table 23, (2,2) can be (1,1) or (3,3)).

[0463] At the same time, considering the (0,2) combination of a non-blocking environment, the UE can receive data for all RVs, and at the time of retransmission, the effective channel coding rate can be reduced as much as possible through the (1,3) combination. The order of RV1 and RV3 is applied in this example, and the order mapped to different TCI states can also be defined as the order of RV3 and RV1. In addition, considering that the (0,2) combination of a non-blocking environment can be replaced and defined with the (0,x) combination, and in this case, the RV combination for retransmission in a non-blocking environment can be defined as a (y,z) value other than (0,x). In this example, x can become one of 1, 2, and 3, and y and z can correspond to non-redundant values ​​among the values ​​other than 0 and x, respectively. For example, when the combination indicated by the value "10" is (0,1), the combination indicated by the value "11" can be (2,3) or (3,2). Alternatively, for example, when the combination indicated by the value "10" is (0, 3), the combination indicated by the value "11" may be (1, 2) or (2, 1).

[0464] The example of a specific RV combination may be an example, and it is obvious that the features of the proposed scheme may be applied to RV combinations constituted by using other RV values.

[0465] Furthermore, in the present disclosure, the RV value, RV value information, or RV value-related information or RV value indication information may be interpreted / used as actual RV difference / difference in the sequence / actual RV value / RV combination-related indication information.

[0466] <Proposal 2-3>

[0467] In the above-mentioned proposal 2-1, a method for indicating the number of shifted symbols between different transmission opportunities is described. In addition, in the above-mentioned proposal 2-2, a method for indicating different RV values ​​for different transmission opportunities is described. The method and / or embodiments (e.g., Examples 1 to 5) of the above-mentioned proposal 2 can be used to indicate the number of shifted symbols and / or RV value related information (e.g., RV value difference, actual RV value, RV combination related indication information, etc.).

[0468] The BS may configure the UE with values ​​applicable to the number of shifted symbols and / or RV value related information through higher layer signaling (e.g., RRC / MAC CE). And / or, (one or more) candidate values ​​of the number of shifted symbols and / or RV value related information that are fixed and / or (pre-) committed between the BS and the UE may be defined, and the BS may implicitly or explicitly indicate a specific value among the candidate values ​​for the number of shifted symbols and / or RV value related information that may be indicated to the UE through a specific field in the DCI.

[0469] In this proposal, the candidate value may refer to some / all values ​​configured by the BS to the UE through higher layer signaling based on pre-configured / defined commitments / rules / conditions in the number of shifted symbols and / or RV value related information. In addition, the specific field in the DCI may be a newly defined field or a conventional field (e.g., TCI status field, (one or more) antenna port fields, MCS field, NDI field, RV field, etc.) for indicating the number of shifted symbols and / or RV value related information.

[0470] For example, when the number of shift symbols and / or RV value related information is configured to the UE through higher layer signaling, it can be assumed that {1, 2, 3, 4} is defined as the applicable number of shift symbols. Some of the values ​​(e.g., {1, 2}) as the number of shift symbols and / or RV value related information can be configured to the UE through higher layer signaling. For example, a specific value (e.g., {1, 2}) in the (one or more) candidate values ​​can be indicated by a specific field in the DCI.

[0471] For example, as an example of a specific field in the DCI, (one or more) antenna port fields may be used. A specific shift symbol number and / or RV value related information may be indicated based on the index of the CDM group indicated by the (one or more) antenna port field. As an example, when the indicated CDM group index is 0 (i.e., when the indicated (one or more) DMRS ports are included in CDM group 0), a smaller RV value related information in the candidate values ​​for the smaller shift symbol number and / or RV value related information may be indicated. When the indicated CDM group index is 1 (i.e., when the indicated (one or more) DMRS ports are included in CDM group 1), a larger RV value related information in the candidate values ​​for the larger shift symbol number and / or RV value related information may be indicated.

[0472] As a specific example, when candidate values ​​for the shift symbol number such as {1, 2} are configured, 1 shift symbol may be indicated in the case of indicating CDM group index 0, and 2 shift symbols may be indicated in the case of indicating CDM group index 1. Alternatively, the opposite is also possible.

[0473] As another example, the modulation and coding scheme (MCS) / new data indicator (NDI) / redundancy version (RV) field for the second transport block (TB) in the DCI may be used. For example, different shift symbol numbers and / or RV value related information may be mapped to code points corresponding to the MCS / NDI / RV fields for the second TB, and the BS may indicate specific shift symbol numbers and / or RV value related information to the UE through the relevant fields.

[0474] As another example, as an example of a specific field in the DCI, (one or more) antenna port fields may be used. For example, specific shift symbol number and / or RV value related information may be indicated based on (one or more) DMRS antenna port indexes indicated by (one or more) antenna port fields.

[0475] As an example, a specific shift symbol number and / or RV value related information may be mapped to a specific DRM antenna port or DMRS antenna port (DMRS antenna port group).

[0476] Table 24 shows an example in which different shift symbol numbers and / or RV value related information are mapped to different DMRS antenna ports. Table 25 shows an example in which different shift symbol numbers and / or RV value related information are mapped by a group granularity consisting of multiple DMRS antenna ports.

[0477] [Table 24]

[0478]

[0479] [Table 25]

[0480]

[0481] In Tables 24 and 25, k1 to k12 may refer to different shift symbol numbers and / or RV value related information. In this case, some values ​​of k1 to k12 may correspond to the same value. The values ​​corresponding to the above k1 to k12 may be configured to the UE through higher layer signaling, or specific values ​​may be defined by a fixed rule between the BS and the UE.

[0482] In the examples of Table 24 and Table 25, different shift symbol numbers and / or RV value related information may be indicated according to the DMRS port index indicated to the UE. For example, referring to Table 25, when DMRS port 0 is indicated to the UE, the shift symbol number and / or RV value related information corresponding to k1 may be indicated, and when DMRS port 2 is indicated, the shift symbol number and / or RV value related information corresponding to k2 may be indicated.

[0483] At the same time, when multiple DMRS ports are indicated to the UE, the UE may assume that the shift symbol number and / or RV value related information corresponding to a specific DMRS port. For example, it may be defined to follow the shift symbol number and / or RV value related information corresponding to a higher or lower index. As an example, when DMRS ports 0 and 1 are indicated and defined as corresponding to a lower index, the shift symbol number and / or RV value related information corresponding to k1 corresponding to DMRS port 0 may be indicated.

[0484] In addition to this proposal, a method for indicating different shift symbol numbers and / or RV value related information may be indicated according to the order of the DMRX port indexes in the same CDM group. In other words, a specific shift symbol number and / or RV value related information may be mapped to a DMRS antenna port group consisting of DMRS antenna ports included in different CDM groups.

[0485] Table 26 shows an example of mapping different shift symbol numbers and / or RV value related information according to the order of DMRS port indexes in the same CDM group.

[0486] [Table 26]

[0487]

[0488]

[0489] In Table 26, k1 to k4 refer to different shift symbol numbers and / or RV value related information. In this case, some values ​​of k1 to k4 may correspond to the same value. The shift symbol number and / or RV value related information may be configured to the UE through higher layer signaling, or a specific value may be defined by a fixed rule between the BS and the UE.

[0490] Referring to Table 26, different shift symbol numbers and / or RV value related information may be indicated based on the DMRS port index indicated to the UE according to the order in the CDM group including the relevant DMRS port. For example, assuming DRMS ​​configuration type 1, when DMRS port 0 is indicated to the UE, the shift symbol number and / or RV value related information corresponding to k1 may be indicated, and when DMRS port 4 is indicated, the shift symbol number and / or RV value related information corresponding to k3 may be indicated.

[0491] At the same time, when multiple DMRS ports are indicated to the UE, the UE may assume that the shift symbol number and / or RV value related information corresponding to a specific DMRS port. For example, it may be defined to follow the shift symbol number and / or RV value related information corresponding to a higher or lower index. As an example, when DMRS ports 0 and 1 are indicated and defined to follow the shift symbol number and / or RV value related information corresponding to the lower index, the shift symbol number and / or RV value related information corresponding to k1 corresponding to DMRS port 0 may be indicated.

[0492] As in the example of Table 26, when different shift symbol numbers and / or RV value-related information are indicated according to the order of DMRX port indexes in the same CDM group, the following advantages may exist.

[0493] When considering the case of multi-user (MU) pairing assuming Scheme 2b or Scheme 3, it is more natural to MU pair a small number of UEs than to MU pair a large number of UEs. The reason is that MU pairing is mainly used for the purpose of increasing the data transmission rate by sending data to multiple UEs at the same time, and for this purpose, it should be possible to apply precoding orthogonal to different UEs in order to prevent interference between UEs. However, in the case of URLLC, it is preferred to minimize interference with another UE, and in addition, in order to reduce the delay time, emergency data transmission can be performed, and in this case, it may be difficult and not preferred to find a UE with precoding orthogonal in a short time. Therefore, when assuming MU pairing of a small number of UEs, different UEs can be supported by (one or more) DMRS ports included in different CDM groups. The reason is that the interference between DMRS ports based on FDM multiplexing is expected to be less than the interference between DMRS ports based on CDM multiplexing during channel estimation.

[0494] When assuming the case where different UEs are supported by (one or more) DMRS ports included in different CDM groups, it should be possible to indicate different shift symbol numbers and / or RV value related information to each UE through (one or more) DMRS ports in the same CDM group.

[0495] For example, when the maximum number of DMRS symbols is 1 and DMRS type 1 is assumed, DMRS ports 0 and 1 and DMRS ports 2 and 3 are included in CDM groups 0 and 1, respectively. In this case, when DMRS ports 0 and 1 correspond to the same shift symbol number and / or RV value related information and DMRS ports 2 and 3 correspond to the same shift symbol number and / or RV value related information, there is no method capable of indicating different shift symbol numbers and / or RV value related information to different corresponding UEs. Therefore, it can be considered that it is preferred that different shift symbol numbers and / or RV value related information correspond to (one or more) different DMRS ports in the same CDM group.

[0496] To this end, according to the proposed method, different shift symbol numbers and / or RV value related information can be mapped according to the order of DMRS port indexes in the same CDM group, and specific shift symbol numbers and / or RV value related information can be indicated according to the DMRS port index indicated to the UE.

[0497] Table 27 shows another example of mapping different shift symbol numbers and / or RV value related information according to the order of DMRS port indexes.

[0498] [Table 27]

[0499]

[0500] Table 27 is characterized in that Table 27 is different from Table 26 in terms of shift symbol number and / or RV value related information corresponding to the DMRS ports included in CDM group 1. This has the following characteristics: when multiple DMRS ports are indicated to the UE, in the case where the definition follows the shift symbol number and / or RV value related information corresponding to the small or large DMRS port, different shift symbol number and / or RV value related information can be indicated by the DMRS port combination included in different CDM groups.

[0501] As an example, when Table 26 and the shift symbol number and / or RV value related information correspond to a small DMRS port, the shift symbol number and / or RV value related information corresponding to k1 may be indicated for each of the combination of DMRS ports 0 and 1 and the combination of DMRS ports 2 and 3. On the contrary, when Table 27 is assumed, the shift symbol number and / or RV value related information corresponding to k1 may be indicated for DMRS ports 0 and 1, and the shift symbol number and / or RV value related information corresponding to k2 may be indicated for DMRS ports 2 and 3.

[0502] At the same time, in addition to the matters given in the examples of Tables 24, 25, 26 and 27, the shift symbol number and / or RV value related information corresponding to each DMRS port can be defined differently according to the maximum symbol number of DMRS configured for the UE (e.g., "maxLength").

[0503] Table 28 shows an example of differently defining the shift symbol number and / or RV value-related information corresponding to each DMRS port according to the maximum symbol number of the DMRS based on Table 27.

[0504] [Table 28]

[0505]

[0506] Referring to Table 28, the shift symbol number and / or RV value related information corresponding to the DMRS port can be defined differently according to the maximum symbol number of the DMRS. For example, when the maximum symbol number is 1 (ie, MaxLength = 1), in the case of 1-layer transmission, the shift symbol number and / or RV value related information corresponding to k1 and k2, respectively, can be indicated by using DMRS ports in different CDM groups. In addition, in the case of 2-layer transmission, when it is assumed that the number of repeated transmissions corresponding to the small DMRS port is followed, k1 and k2 can be indicated by using the (0,1) combination and the (2,3) combination, respectively. On the contrary, when the maximum symbol number is 2 (i.e., maxLength = 2), in the case of 1-layer transmission, the shift symbol numbers and / or RV value-related information corresponding to k1, k2, k3 and k4 can be respectively indicated by using DMRS ports in different CDM groups, and k1 and k2 can be respectively indicated by using the (0,1) combination and the (4,5) combination by assuming the number of repeated transmissions corresponding to the small DMRS ports, and k1 and k2 can be respectively indicated by using the (2,3) combination and the (6,7) combination in the case of 2-layer transmission.

[0507] That is, in this example, there are the following features: when the maximum symbol number of DMRS is 1, in 2-layer transmission, different shift symbol numbers and / or RV value-related information can be indicated by DMRS port combinations in different CDM groups, and when the maximum symbol number is 2, in 2-layer transmission, different shift symbol numbers and / or RV value-related information can be indicated by DMRS port combinations in the same CDM group.

[0508] The advantage of Table 27 is that, since the shift symbol numbers and / or RV value related information corresponding to k1, k2, k3 and k4 can be indicated during 2-layer transmission, more different shift symbol numbers and / or RV value related information can be indicated by assuming one UE.

[0509] The advantage of Table 28 is that, since the shift symbol number and / or RV value related information corresponding to k1 and k2 can be indicated, but the same shift symbol number and / or RV value related information can be indicated in each different CDM group, during 2-layer transmission, when considering MU pairing, independent shift symbol number and / or RV value related information can be indicated to different UEs.

[0510] <Proposal 3>

[0511] Proposal 3 in the present disclosure proposes a method for configuring / indicating a transmission resource region in repeated transmission in the time domain.

[0512] DCI (e.g., DCI format 1_1, etc.) includes a field, namely, "time domain resource allocation" for time domain resource scheduling. Therefore, when it is intended to perform repeated transmission in the time domain, a method is required to be able to configure time resources for each transmission opportunity. To this end, a new field can also be defined in the DCI, but in this case, the size of the DCI format is diversified, and therefore, the complexity of the UE for decoding the PDCCH may increase. In order to configure / indicate the time domain resources for time domain repeated transmission while keeping the conventional DCI format intact, specific rules can be defined between the BS and the UE.

[0513] When micro-slot granularity repeated transmission is configured / indicated to the UE, the time domain resources indicated by the DCI may correspond to the first transmission opportunity, and the time domain resources used for other transmission opportunities may have the same size as the resources indicated by the DCI and may be configured in cascade with the related resources. In other words, the time domain resources indicated by the "time domain resource allocation" field based on the DCI may correspond to the first transmission opportunity. The time domain resources used for the second transmission opportunity may have the same size as the time domain resources of the first transmission opportunity and may be configured in cascade with it. As an example, the first transmission opportunity and the second transmission opportunity may have the same symbol number.

[0514] In the above description, "mini-slot" may refer to a scheduling structure having a granularity of 2, 4, 6, and 7 symbols which may be indicated by PDSCH mapping type B.

[0515] Fig.13 An example of resource allocation for repeated transmission in the time domain proposed in the present disclosure is illustrated. Fig.13 This is just an example for convenience of description and does not limit the technical scope of the present disclosure.

[0516] refer to Fig.13 , four symbols #3 to #6 are indicated by DCI, and it is assumed that the symbols are allocated for the first transmission opportunity. In addition, according to the proposed method, time domain resources with the same size (ie, four symbols) can be concatenated and allocated for the second transmission opportunity. Fig.13 In the example of , only until the second transmission opportunity is illustrated, but the proposed method can be applied even if there is an additional transmission opportunity. For example, a third transmission opportunity can be defined according to a rule after the second transmission opportunity, and the proposal is applied to the transmission opportunity that can be additionally defined based on the above transmission opportunity to allocate time domain resources.

[0517] In the case of allocating time domain resources for repeated transmission as in the method of Proposal 3, since a separate DCI field is not required, there is an advantage that the conventional DCI format can be maintained. In addition, since additional signaling for resource configuration is not required for each transmission opportunity, it is advantageous even in terms of signaling overhead.

[0518] In Proposal 3, when concatenating different transmission opportunities, the application of gap symbol(s) may be considered. When concatenating different transmission opportunities according to a specific subcarrier spacing (SCS) value or UE capability related to whether the UE can shift the FFT window, it may be determined whether to apply gap symbol(s).

[0519] For example, when the SCS is large, different transmission opportunities can be cascaded with N symbol slots. In other words, the resources of the second transmission opportunity can be allocated from the symbol separated from the first transmission opportunity (after the first transmission opportunity) by N symbol slots. The reason is that the case where the SCS is large may refer to FR2, which means a higher frequency band, and in this case, due to the difference in transmission time from different TRPs, the influence of inter-symbol interference may increase, and a situation in which a switching delay for the transmission and reception beams of the BS / UE should be considered may occur.

[0520] Therefore, the BS can configure / indicate to the UE whether to apply (one or more) gap symbols and / or the number of gap symbols when cascading different transmission opportunities. For example, whether to apply (one or more) gap symbols and / or the number of gap symbols can be forwarded through higher layer signaling (e.g., RRC / MAC-CE). For example, while mapping to a specific subcarrier spacing (SCS) value, the UE can be configured / indicated whether to apply (one or more) gap symbols or / and the number of gap symbols. SCS may refer to an SCS value configured to the UE for downlink data reception. The mapping relationship can be fixedly defined between the BS and the UE, or configured to the UE through higher layer signaling.

[0521] As another example, a UE that can move dynamically based on the UE capability for dynamically shifting the FFT window can concatenate different transmission opportunities without gap symbols, or otherwise concatenate different transmission opportunities with (one or more) gap symbols, where the FFT window can refer to the granularity at which the UE obtains sample values ​​for symbols subjected to OFDM.

[0522] In the above Fig.13 In the example of , two transmission opportunities are assumed, but two or more transmission opportunities may be indicated / configured. When the method of the above-mentioned proposal 3 is applied, there may be a case where repeated transmission should be performed by more than one time slot in some cases. In order to prevent this, when repeated transmission is performed by more than one time slot, the transmission opportunity that can be defined in the first time slot may be repeatedly transmitted at the time slot granularity.

[0523] Fig.14 An example of repeating transmission in a time slot unit based on a transmission timing structure defined in a first time slot in order to prevent repeated transmission of more than one time slot is illustrated. Fig.14 , four symbols #3 to #6 are indicated by DCI, and it is assumed that the symbols are allocated to the first transmission opportunity. In addition, Fig.14 It is shown that time domain resources of the same size (i.e., four symbols) can be concatenated and allocated for the second transmission opportunity according to the proposal. Since it is possible to transmit up to the second transmission opportunity in one time slot, the second transmission opportunity can be configured as concatenation. In order to concatenate and configure the third transmission opportunity, four symbols are required, but the remaining symbols exceed one time slot after three (11, 12, and 13). In this case, as proposed in the present disclosure, the transmission opportunity structure that can be defined in the first time slot can be repeatedly transmitted at the time slot granularity.

[0524] In addition to the above-mentioned Proposal 3, a method for configuring time domain resources for transmission opportunities for repeated transmission even when time domain resources for different transmission opportunities may not be allocated to the same time slot may be needed. Hereinafter, a method for solving such a problem will be described in detail.

[0525] As a first method, the BS may configure / indicate micro-slot granularity repetitive transmission only in one time slot to prevent this problem from occurring. As described above, "micro-slot granularity repetitive transmission" may refer to a scheduling structure with repetitive transmissions that may be in granularity of 2, 4, 6, and 7 symbols indicated by PDSCH mapping type B. In this case, time resources for all transmission opportunities may be allocated in one time slot, and the UE may not expect to indicate repetitive transmissions exceeding one time slot.

[0526] As a second method, when defining time domain resources for each transmission opportunity according to the above-mentioned Proposal 3, if a transmission opportunity exceeding a time slot boundary is generated, the relevant transmission opportunity can be defined as a resource allocated in the same form as the previous transmission opportunity in the next time slot.

[0527] Fig.15 An example of resource allocation for transmission opportunities beyond the time slot boundary according to the method proposed in this disclosure is illustrated. Fig.15 It is only for the convenience of description and does not limit the technical scope of the present disclosure.

[0528] exist Fig.15 In the example of , it is assumed that the time domain resources indicated by the DCI are from symbol #8 to symbol #11, and the relevant resources are allocated to the first transmission opportunity. When considering the method of the above-mentioned proposal 3, in the second transmission opportunity transmitted subsequently, resources with the same size should be allocated in cascade after the first transmission opportunity, but exceeding Fig.15 . Therefore, in this case, it can be assumed that regarding the time domain resources for the second transmission opportunity, the resources at the same position as the first transmission opportunity are allocated in the next time slot. That is, the resources for the second transmission opportunity can be allocated from symbol #8 to symbol #11 of the second time slot. In addition, the same rule is applied even to the case of the third transmission opportunity to allocate resources from symbols #8 to #11 of the third time slot.

[0529] When resources are thus configured for transmission opportunities of repeated transmission, repeated transmissions exceeding the time slot boundary can be supported, but there may be a disadvantage of increased delay. As a method capable of compensating for such delay, a third method is proposed.

[0530] As a third method, when the time domain resources of each transmission opportunity are defined according to the above-mentioned proposal 3, if a transmission opportunity exceeding the time slot boundary is generated, the relevant transmission opportunity can be configured / defined to be transmitted from a specific symbol position of the next time slot. For example, the specific symbol position can follow the front-load DMRS position of the PDSCH mapping type A configured to the UE. The front-load DMRS position for PDSCH mapping type A can be configured to the UE through the higher layer parameter "dmrs-TypeA-Position".

[0531] Fig.16 An example of a time domain resource allocation method when a transmission opportunity exceeding a time slot boundary occurs, to which the method proposed in the present disclosure can be applied, is illustrated. Fig.16 This is just an example for convenience of description and does not limit the technical scope of the present disclosure.

[0532] refer to Fig.16 , assuming that the time domain resources indicated by DCI are from symbol #8 to symbol #11, and the relevant resources are allocated to the first transmission opportunity. When considering the method of the above-mentioned proposal 3, in the second transmission opportunity transmitted subsequently, resources with the same size should be allocated in cascade after the first transmission opportunity, but exceeding Fig.16 Therefore, in this case, it can be assumed that, regarding the time domain resources for the second transmission opportunity, resources are allocated from the front-load DMRS position of the PDSCH mapping type A configured to the UE in the next time slot. Fig.15 In the example, it is assumed that "dmrs-TypeA-Position" is configured as 2.

[0533] exist Fig.16 In the example of , a third transmission opportunity can be defined in the same time slot after the second transmission opportunity according to Proposal 3, and resources having the same size can be allocated in cascade with each other. In this proposal, there may be an advantage that latency can be reduced by removing unnecessary delays.

[0534] In this proposal, it is proposed that the "specific symbol position" may more characteristically follow the frontload DMRS position for PDSCH mapping type A configured to the UE, and when it is considered that PDCCH transmission from the BS can be achieved in a symbol duration earlier than the frontload DMRS position for PDSCH mapping type A configured to the UE, there may be an advantage that collision between repeatedly transmitted PDCCH and PDSCH can be avoided by the proposed method.

[0535] As a fourth method, when the BS intends to perform micro-slot granularity repeated transmission, the BS may configure / indicate time resource allocation candidates for performing micro-slot granularity repeated transmission. The BS may configure / indicate a specific time resource allocation scheme among the time resource allocation candidates to the UE while configuring / indicating micro-slot granularity repeated transmission to the UE. "Micro-slot" may refer to a scheduling structure with a granularity of 2, 4, 6, and 7 symbols that may be indicated by PDSCH mapping type B.

[0536] The time resource allocation can be indicated to the UE through the "time domain resource allocation" field in the DCI. According to the current standard, a time domain resource in a time slot can be indicated by a field value. A method for enhancing the function of the "time domain resource allocation" field to perform micro-time slot granularity repeated transmission can be considered as follows.

[0537] For example, the method of interpreting the field may be different when the UE is configured / indicated to have mini-slot granularity repeated transmission and when the UE is not configured / indicated to have mini-slot granularity repeated transmission.

[0538] Specifically, when the BS intends to perform repeated transmission at a micro-slot granularity, the BS may configure / indicate a time resource allocation candidate corresponding to the field. For ease of description, the candidate is referred to as the first candidate. Alternatively, when the relevant operation is not repeated transmission at a micro-slot granularity, the BS may configure / indicate a time resource allocation candidate corresponding to the field. For ease of description, the candidate is referred to as the second candidate.

[0539] When the UE is configured / indicated with repeated transmission with micro-slot granularity, the UE can expect that one of the values ​​of the first candidate will be indicated through the "time domain resource allocation" field. Conversely, when the operation is not repeated transmission with micro-slot granularity, the UE can expect that a value of the second candidate will be indicated. In addition, the time resource allocation candidates included in the first candidate may include time domain resource information for multiple transmission opportunities. In addition, each candidate may correspond to a different transmission opportunity number, and indicate a specific value to indicate a specific transmission opportunity number.

[0540] In the proposed method, the BS may apply the method and / or embodiment of the above-mentioned proposal 1 to configure / indicate micro-slot granularity repetitive transmission to the UE. For example, micro-slot granularity repetitive transmission in multiple repetitive transmission methods may be configured through higher layer signaling, and whether micro-slot granularity repetitive transmission is actually performed may be indicated through DCI. Therefore, when it is indicated that micro-slot granularity repetitive transmission is actually performed through DCI, a value of the first candidate may be indicated for time resource allocation according to the proposed scheme, and when micro-slot granularity repetitive transmission is not indicated, a value of the second candidate may be indicated for time resource allocation.

[0541] The example of signaling may be one example for applying the proposed solution, and it is apparent that other examples of applying the proposed solution may also be included in the proposal, and the method in which the related proposed matter may be applied is not limited to the example.

[0542] Table 29 shows an example of the first candidate that can be indicated by the "time domain resource allocation" field when performing mini-slot granularity repeated transmission. Table 29 is only an example to help understand the present disclosure and does not limit the technical scope of the present disclosure.

[0543] [Table 29]

[0544] Row Index PDSCH mapping type K0 S1 L1 S2 L2 S3 L3 S4 L4 1 Type B 0 5 2 7 2 2 Type B 0 5 2 7 2 9 2 11 2 3 Type B 0 9 2 11 2 4 Type B 0 4 4 8 4 5 Type B 0 6 4 10 4 6 Type B 0 0 7 7 7 7 Type B 0 5 2 7 4 11 2 8 Type B 0 4 2 6 2 8 4 12 2 9 Type B 0 5 2 8 2 10 Type B 0 4 4 9 4 11 Type B 0 4 4 10 4

[0545] In Table 29, K0, Sx (x=1, 2, 3, 4) and Lx (x=1, 2, 3, 4) may respectively refer to the time slot granularity distance from the time slot where DCI is received to the time slot where PDSCH is actually scheduled, the starting symbol position of the scheduled resources based on the starting time point of the time slot of the x-th transmission opportunity, and the number of symbols continuously scheduled from Sx for the x-th transmission opportunity.

[0546] The proposed scheme as exemplified in Table 29 has the following features.

[0547] First, the number of different transmission opportunities can be indicated. Referring to Table 29, row index 1 / 3 / 4 / 5 indicates a transmission opportunity number corresponding to 2, row index 7 indicates a transmission opportunity number corresponding to 3, and row index 2 / 8 indicates a transmission opportunity number corresponding to 4.

[0548] Second, mini-slots with different symbol lengths may be allocated to different transmission opportunities. Referring to Table 29, row index 7 / 8 may be indicated for different transmission opportunities for mini-slots with a symbol length of 2 and mini-slots with a symbol length of 4.

[0549] Third, it is possible to indicate whether there is a gap symbol or / and the length of the gap symbol between different transmission opportunities. Referring to Table 29, when comparing the resource allocation of row indexes 1 and 9, the resource allocation is the same because two transmission opportunities are indicated, and the starting symbol of the first transmission opportunity is the same and two symbols are allocated to each transmission opportunity, but the difference is whether there is a gap symbol between the first transmission opportunity and the second transmission opportunity. That is, in row index 1, there is no gap symbol, and in row index 9, there is a gap symbol. It can be confirmed that even in row indexes #4 and #10, there is a difference in whether there is a gap symbol between different transmission opportunities. At the same time, when comparing row indexes 10 and 11, it can be confirmed that the length of the gap symbol can be indicated. It can be confirmed that in the case of row index 10, there is a gap symbol between different transmission opportunities, and in the case of row index 11, there are two gap symbols.

[0550] In the proposal, the "time domain resource allocation" field is assumed to be a DCI field for indicating one value of the time resource allocation candidate, but it is obvious that it is also possible to apply the proposed method by using another field in the DCI. For example, a new DCI field may be introduced in order to implement the proposed scheme, or the proposed method may be applied by interpreting a specific field among the fields in the DCI defined in the current standard differently. For example, the proposed method may be applied by making the (one or more) antenna port fields defined in TS 38.212 or / and the MCS / RV / NDI fields corresponding to each TB1 / 2 different.

[0551] In addition, as in the method and / or embodiment of the above-mentioned proposal 3, when repeated transmission is performed in the time domain, the DMRS pattern for the transmission opportunity of repeated transmission can be determined as follows. The DMRS pattern for the first transmission opportunity can be indicated by DCI, and the DMRS pattern for other transmission opportunities can adopt the same pattern as the DMRS pattern for the first transmission opportunity indicated by DCI.

[0552] Fig.17 An example of applying a DMRS pattern to a transmission opportunity of repeated transmission is illustrated.

[0553] <Proposal 4>

[0554] The TCI state field (ie, the transmission configuration indication field) in the current DCI can indicate up to two TCI states through a specific code point. In this case, eMBB operation is assumed. In other words, the specific code point configured by the TCI field in the DCI can correspond to multiple (e.g., two) TCI states, and the eMBB operation is defined in a manner that indicates up to two TCI states by a specific code point. In this case, when considering URLLC operation, improvements to some operations can be considered. The reason is that it is preferred to indicate more TCI states in the case of URLLC operation.

[0555] For example, it is possible to consider increasing the diversity gain by increasing the number of repeated transmissions in URLLC operation, and enhancing the received SNR. Therefore, multiple TCI states need to be considered, and the limitation of up to two TCI states defined by assuming eMBB can be alleviated. In this case, the code points mapped to the TCI state field for eMBB operation and the code points mapped to the TCI state field for URLLC operation can be configured differently / separately.

[0556] For example, a code point mapped to the TCI state field for eMBB operation may indicate up to two TCI states, while a code point mapped to the TCI state field for URLLC operation may be configured to indicate up to four TCI states. In this example, the number of up to four TCI states is merely an example for ease of description and does not limit the technical scope of the present disclosure, and may also indicate four or more TCI states.

[0557] To this end, the BS can configure / indicate whether the relevant operation is an eMBB operation or a URLLC operation, and can determine which code point configuration the UE will follow based on the configured operation. In this proposal, as a method for configuring / indicating eMBB operation or URLLC operation to the UE, the method of the above-mentioned proposal 1 can be applied. For example, a specific repetition transmission method (scheme) among multiple repetition transmission methods can be configured through higher layer signaling, and DCI can be used to indicate whether URLLC operation (repeated transmission) or eMBB operation is actually to be performed. Alternatively, one of the eMBB and URLLC operations can be directly configured through specific higher layer parameters.

[0558] Alternatively, a specific operation in the eMBB operation and the URLLC operation may be indicated according to the RNTI value to successfully decode the PDCCH by mapping the specific RNTI value and the specific operation. For example, when CRC masking of the DCI received by the UE is performed by using the RNTI configured as the usage of MTRP-URLLC, the UE can recognize that the URLLC operation is configured, and when CRC masking of the DCI is performed by using the RNTI configured as the usage of MTRP-eMBB, the UE can recognize that the eMBB operation is configured.

[0559] The example of signaling may be one example of applying the proposed solution, and it is obvious that other examples of applying the proposed solution may also be included in the proposal, and the method in which the related proposed matters may be applied is not limited to the example.

[0560] The TCI state corresponding to each code point of the TCI field may be predefined and defined differently for each of the URLLC operation and the eMBB operation. For example, the BS configures the TCI field value to the UE for Tables 30 and 31, respectively, and uses Table 30 in the case of eMBB operation, and uses Table 31 in the case of URLLC operation. In this example, the mapping relationship between the code point of the DCI and the TCI state is represented by a table, but another form of mapping rule may also be configured.

[0561] The TCI field value can be configured by using a MAC CE in a pool of up to 64 TCI states configured using RRC, and the MAC CE for configuring the TCI field value of eMBB and the MAC CE for configuring the URLLC TCI field value can be defined and signaled separately / separately. In addition, the TCI state pools for eMBB and URLLC can also be configured separately.

[0562] [Table 30]

[0563] TCI field code point TCI Status 000 0 001 1 010 2 011 0,1 100 0,2 101 1,2 110 3, 111 4

[0564] [Table 31]

[0565] TCI field code point TCI Status 000 0,1 001 2,5 010 4,5,6,7 011 8,9,10,11 100 0,1,2,3 101 0,2,4,6 110 1,3,5,7 111 10,20

[0566] Fig.18 The diagram illustrates the signaling when the UE receives a single DCI (i.e., when the representative TRP sends DCI to the UE) in the case of M-TRP (alternatively, M cells, hereinafter, all TRPs may be replaced by cells, or even when multiple CORESETs ( / CORESET groups) are configured from one TRP, the corresponding TRP may be assumed to be the M-TRP). Fig.18This is just an example for convenience of description and does not limit the technical scope of the present disclosure.

[0567] In the description below, the network side is described based on "TRP", but as described above, "TRP" can be replaced by expressions including panels, antenna arrays, cells (e.g., macro cells / small cells / pico cells), transmission points (TPs), base stations (gNBs, etc.), etc., and can be applied. In addition, as described above, TRPs can be distinguished based on information about a CORESET group (or CORESET pool) (e.g., an index or ID). As an example, when a UE is configured to perform transmission / reception with a TRP (or cell), this may mean that multiple CORESET groups (or CORESET pools) are configured for one UE. Configuration for a CORESET group (or CORESET pool) can be performed by higher layer signaling (e.g., RRC signaling).

[0568] refer to Fig.18 , for ease of description, signaling between two TRPs and UE is considered, but the corresponding signaling scheme can be widely applied to signaling between multiple TRPs and multiple UEs. In the following description, the network side can be a base station including multiple TRPs, and can be a cell including multiple TRPs. As an example, an ideal / non-ideal backhaul can also be configured between TRP 1 and TRP 2 constituting the network side. In addition, the following description is made based on multiple TRPs, but this can be widely applied to transmission through multiple panels in the same manner. In addition, in the present disclosure, the operation of UE receiving signal TRP 1 / TRP 2 can even be interpreted / described as the operation (or can be the operation) of UE (through / using TRP 1 / 2) receiving the signal from the network side, and the operation of UE sending the signal to TRP 1 / TRP 2 can even be interpreted / described as the operation (or can be the operation) of UE (through / using TRP 1 / TRP 2) sending the signal to the network side, and is interpreted / described conversely.

[0569] The UE may receive configuration information (S1805) for transmission and reception based on multiple TRPs from the network side by / using TRP 1 (and / or TRP 2). That is, the network side may send configuration information (S1805) related to transmission and reception based on multiple TRPs to the UE by / using TRP 1 (and / or TRP 2). The configuration information may include resource information related to the configuration of the network side (i.e., TRP configuration), resource information (resource allocation) related to transmission and reception based on multiple TRPs, and the like. The configuration information may be delivered via higher layer signaling (e.g., RRC signaling, MAC-CE, etc.). In addition, when the configuration information has been previously defined or configured, the corresponding steps may also be skipped.

[0570] For example, the configuration information may include CORESET-related configuration information (e.g., ControlResourceSetIE) as described in the method (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.). The CORESET-related configuration information may include an ID related to the CORESET (e.g., controlResourceSetID), an index of a CORESET pool for the CORESET (e.g., CORESETPoolIndex), a time / frequency resource configuration of the CORESET, TCI information related to the CORESET, etc. The index of the CORESET pool (e.g., CORESETPoolIndex) may refer to a specific index (e.g., CORESET group index, HARQ codebook index) mapped / configured to each CORESET.

[0571] For example, the configuration information may also include configurations related to PDCCH / PDSCH / PUCCH / PUSCH, etc., as described in the method (eg, Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.).

[0572] For example, the configuration information may include information indicating which operation is to be performed among multiple URLLC operations according to a method and / or embodiment (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.). For example, the configuration information may include information for configuring one of the URLLC schemes (e.g., Scheme 2a / 2b / 3 / 4).

[0573] For example, the configuration information may include configuration information for TCI state configuration related to the operation of the method and / or embodiments (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.) / configuration information related to specific repeated transmissions related to URLLC / information about (one or more) values ​​and / or (one or more) candidate values ​​of the number of repeated transmissions for a transmission opportunity / the number of shift symbols between different transmission opportunities / information related to the RV value, etc.

[0574] For example, in the above step S1805, from the network side ( Figures 21 to 25 100 / 200 in the figure) receives a UE ( Figures 21 to 25 The operation of the reference numeral 100 / 200 in the figure can be performed as described below Figures 21 to 25 For example, refer to Fig. 22, one or more processors 102 can control one or more transceivers 106 and / or one or more memories 104 to receive sending and receiving related configuration information based on multiple TRPs, and one or more transceivers 106 can receive configuration information, and one or more transceivers 106 can receive sending and receiving related configuration information based on multiple TRPs from the network side.

[0575] Similarly, in the above step S1805, to the UE ( Figures 21 to 25 The network side ( 100 / 200 in the figure) sends the configuration information related to sending and receiving based on multiple TRPs Figures 21 to 25 The operation of the reference numeral 100 / 200 in the figure can be performed as described below Figures 21 to 25 For example, refer to Fig. 22 , one or more processors 102 can control one or more transceivers 106 and / or one or more memories 104 to send sending and receiving related configuration information based on multiple TRPs, and one or more transceivers 106 can receive configuration information, and one or more transceivers 106 can send sending and receiving related configuration information based on multiple TRPs from the network side.

[0576] The UE may receive DCI and data 1 scheduled by the corresponding DCI from the network side through / using TRP 1 (S1810-1). In addition, the UE may receive data 2 from the network side through / using TRP 2 (S1810-2). That is, the network side may send DCI 1 and data 1 scheduled by the corresponding DCI to the UE through / using TRP 1 (S1810-1). In addition, the network side may send data 2 to the UE through / using TRP 2 (S1810-2). For example, DCI and data (e.g., data 1, data 2) may be transmitted through a control channel (e.g., PDCCH, etc.) and a data channel (e.g., PDSCH, etc.), respectively. In addition, steps S1810-1 and S1810-2 may be performed simultaneously, or either one may be performed earlier than the other.

[0577] For example, the DCI may include a TCI field, (one or more) antenna port fields, a time domain resource allocation field, an MCS field, and an RV field.

[0578] For example, the DCI may include information indicating whether to perform a URLLC operation configured to the UE by higher layer signaling, which operation will be performed as described in the method and / or embodiment (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.). In this case, a specific bit of the DMRS port indication field in the DCI can be used. For example, the DCI may include information indicating the total number of repeated transmissions. In this case, the relevant number of repeated transmissions can be determined based on the number of TCI states indicated by the DCI. For example, the DCI may also include the number of shift symbols between different transmission opportunities / information related to the RV value (e.g., actual RV difference / order difference / actual RV value / RV combination related indication information). For example, the DCI may include information indicating the time domain resources of the repeatedly transmitted data. As an example, the DCI may include information indicating micro-slot granularity repeated transmission / information indicating whether micro-slot granularity repeated transmission is performed. For example, the interpretation of the TCI status field in the DCI can be determined based on whether the eMBB operation is configured or the URLLC operation is configured.

[0579] For example, the DCI may be configured for scheduling of data 1 and data 2, and may indicate that data 1 and data 2 are the same data with the same system bits, as described in the method and / or embodiment (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.). In other words, data 1 and data 2 may correspond to the same TB.

[0580] For example, in the above steps S1810-1 / S1810-2, from the network side ( Figures 21 to 25 100 / 200 in the figure) receives DCI and / or data 1 and / or data 2 UE ( Figures 21 to 25 The operation of the reference numeral 100 / 200 in the figure can be performed as described below Figures 21 to 25 For example, refer to Fig. 22 , one or more processors 102 can control one or more transceivers 106 and / or one or more memories 104 to receive DCI and / or Data 1 and / or Data 2, and one or more transceivers 106 can receive DCI and / or Data 1 and / or Data 2 from the network side.

[0581] Similarly, in the above steps S1810-1 / S1810-2, the UE ( Figures 21 to 25 The network side ( 100 / 200 in the figure) sends DCI and / or data 1 and / or data 2 Figures 21 to 25 The operation of the reference numeral 100 / 200 in the figure can be performed as described below Figures 21 to 25 For example, refer to Fig. 22, one or more processors 102 can control one or more transceivers 106 and / or one or more memories 104 to send DCI and / or Data 1 and / or Data 2, and one or more transceivers 106 can send DCI and / or Data 1 and / or Data 2 to the UE.

[0582] The UE may decode the data 1 and data 2 received from TRP 1 and TRP 2 (S1815). For example, the UE may perform channel estimation and / or decoding on the data based on the method (eg, Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.).

[0583] For example, the UE may know that the BS sends the same data according to a specific URLLC operation, and decode the data 1 and data 2 by assuming that the data 1 and data 2 are the same data and the system bit is the same data, as described in the proposed method and / or embodiment (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.). For example, the UE may decode the data 1 and data 2 by considering the number of repeated transmissions indicated by the BS through higher layer signaling / DCI. As an example, the UE may decode the data 1 and data 2 by assuming that the BS repeatedly sends the same data as the number of TCI states indicated by the DCI. For example, the UE may decode the data 1 and data 2 (repeatedly transmitted in one time slot) based on the number of shifted symbols / information related to the RV value (e.g., actual RV difference / order difference / actual RV value / RV combination related indication information) between different transmission opportunities. For example, the UE may decode the data 1 and data 2 by assuming that the BS repeatedly sends the same data in the time domain indicated by the DCI. For example, the UE may decode the data 1 and data 2 by using the TCI state value indicated by the BS through the DCI.

[0584] For example, the UE ( Figure 21 to Figure 25 The operation of the reference numeral 100 / 200) can be performed as described below Figure 21 to Figure 25 For example, refer to Fig. 22 , one or more processors 102 can control one or more memories 104 to perform operations of decoding data 1 and data 2.

[0585] The UE may send HARQ-ACK information (e.g., ACK information, NACK information, etc.) for the above DCI and / or data 1 and / or data 2 to the network side through one or more PUCCHs, by / using TRP 1 and / or TRP 2 (S1820-1 and S1820-2) based on the proposed method (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.). That is, the network side may receive HARQ-ACK information (e.g., ACK information, NACK information, etc.) for the above DCI and / or data 1 and / or data 2 from the UE through / using TRP 1 and / or TRP 2 through one or more PUCCHs (S1820-1 and S1820-2).

[0586] For example, HARQ-ACK information for data 1 and / or data 2 may be combined into one or separated. In addition, the UE may be configured to send HARQ-ACK information only to a representative TRP (e.g., TRP 1), and may also omit sending HARQ-ACK information to another TRP (e.g., TRP 2). For example, HARQ-ACK information may be sent via PUCCH and / or PUSCH.

[0587] For example, in the above steps S1820-1 / S1820-2, one or more PUCCHs are used to send a signal to the network side ( Figure 21 to Figure 25 100 / 200 in the figure) sends HARQ-ACK information for data 1 and / or data 2 to the UE ( Figure 21 to Figure 25 The operation of the reference numeral 100 / 200 in the figure can be performed as described below Figure 21 to Figure 25 For example, refer to Fig. 22 , one or more processors 102 can control one or more transceivers 106 and / or one or more memories 104 to send HARQ-ACK information for data 1 and / or data 2 through one or more PUCCHs, and one or more transceivers 106 can send HARQ-ACK information for data 1 and / or data 2 to the network side.

[0588] Similarly, in the above steps S1820-1 / S1820-2, one or more PUCCHs are used to obtain the information from the UE ( Figure 21 to Figure 25 The network side ( 100 / 200 in the figure) receives the HARQ-ACK information for data 1 and / or data 2 Figure 21 to Figure 25 The operation of the reference numeral 100 / 200 in the figure can be performed as described below Figure 21 to Figure 25 For example, refer to Fig. 22, one or more processors 102 can control one or more transceivers 106 and / or one or more memories 104 to receive HARQ-ACK information for data 1 and / or data 2, and one or more transceivers 106 can receive HARQ-ACK information for data 1 and / or data 2 from the UE.

[0589] In the above Fig.18 In the present invention, the M-TRP operation based on a single DCI is mainly described to describe these methods, but in some cases, these methods can even be applied to the M-TRP operation based on multiple DCIs.

[0590] Fig.19 An example of an operational flow chart of downlink data reception of a UE to which the methods proposed in the present disclosure (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.) can be applied is illustrated. The UE can be supported by multiple TRPs, and ideal / non-ideal backhaul can be configured between multiple TRPs. Fig.19 It is only for the convenience of description and does not limit the scope of the present disclosure. In addition, it can be omitted according to the situation and / or configuration Fig.19 Some of the steps shown in .

[0591] In the following description, the network side is described based on "TRP", but as described above, "TRP" can be replaced by expressions including panels, antenna arrays, cells (e.g., macro cells / small cells / pico cells), transmission points (TPs), base stations (gNBs, etc.), etc., and can be applied. In addition, as described above, TRPs can be distinguished based on information about a CORESET group (or CORESET pool) (e.g., an index or ID). As an example, when a UE is configured to perform transmission / reception with multiple TRPs (or cells), this may mean that multiple CORESET groups (or CORESET pools) are configured for one UE. The configuration for the CORESET group (or CORESET pool) can be performed by higher layer signaling (e.g., RRC signaling).

[0592] The UE may receive configuration information for the PDSCH (S1910). The configuration information may be received through higher layer signaling (e.g., RRC or MAC-CE). The configuration information may include information related to the method and / or embodiments described in the method (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.).

[0593] For example, the configuration information may include multiple TCI state configurations. Each TCI state configuration may include parameters for configuring a quasi co-location relationship between one or two downlink reference signals and a DM-RS port of a PDSCH.

[0594] For example, the configuration information may include CORESET-related configuration information (e.g., ControlResourceSet IE). The CORESET-related configuration information may include an ID related to the CORESET (e.g., controlResourceSetID), an index of a CORESET pool for the CORESET (e.g., CORESETPoolIndex), a time / frequency resource configuration of the CORESET, TCI information related to the CORESET, etc.

[0595] For example, the configuration information may include downlink channel related configuration (eg, PDCCH-Config, PDSCH-Config). The downlink channel related configuration may include DMRS MaxLength, configuration type, mapping type, etc.

[0596] For example, the configuration information may include information about a transmission scheme for downlink data. Based on the information about the downlink data transmission scheme, eMBB operation or URLLC operation may be configured, or one of multiple schemes (e.g., SDM scheme, TDM scheme, or FDM scheme) related to URLLC operation may be indicated / configured. As an example, the configuration information may include a higher layer parameter (e.g., RepSchemeEnabler) for indicating one of the schemes for URLLC operation, and the relevant scheme may be configured by using a higher layer parameter to determine whether it is an FDM-based scheme (e.g., Scheme 2a / 2b) or a TDM-based scheme (Scheme 3 / 4).

[0597] For example, the configuration information may include information related to the number of transmission opportunities. As an example, the configuration information may include a parameter (e.g., repetitionnumber) for configuring the number of repetitions of the transmission opportunity, and a specific number of repetitions (e.g., 2, 3, 4, 5, 6, 7, 8, or 16) may be indicated by the parameter. As another example, candidate values ​​for the number of multiple transmission opportunities may be indicated based on the configuration information.

[0598] For example, the configuration information may include information about the number of shift symbols between transmission opportunities. The shift symbol may be replaced by an expression such as a gap symbol or a symbol offset. As an example, the shift symbol may refer to the gap between the last symbol of the first transmission opportunity and the first symbol of the second transmission opportunity.

[0599] For example, the UE ( Figure 21 to Figure 25 The operation of the reference numeral 100 / 200 in the figure can be performed as described below Figure 21 to Figure 25 For example, refer to Fig. 22, the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to send configuration information, and the one or more transceivers 106 may receive the configuration information.

[0600] The UE may receive activation information (S1920). The activation information may be forwarded by MAC-CE. For example, some of the multiple TCI state configurations included in the configuration information may be activated based on the activation information. As an example, 64 TCI state configurations may be included in the configuration information, and 8 of the 64 TCI state configurations may be activated by the activation information. The activation information may include mapping information between the code point of the transmission configuration indication (TCI) field in the downlink control information (DCI) and the activated TCI state configuration.

[0601] For example, the UE ( Figure 21 to Figure 25 The operation of the reference numeral 100 / 200 in the figure can be performed as described below Figure 21 to Figure 25 For example, refer to Fig. 22 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to send the activation information, and the one or more transceivers 106 may receive the activation information.

[0602] The UE may receive downlink control information (DCI) (S1930). The DCI may be transmitted through a downlink control channel (eg, PDCCH).

[0603] As described in the method (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.), the DCI may include at least one of a DMRS port-related field (e.g., (one or more) antenna port fields), a transport block-related field (e.g., an MCS / new data indicator / RV field), a transmission configuration indication (TCI) field, a time domain resource allocation field, or a redundancy version (RV) field.

[0604] For example, multiple TCI states can be indicated based on the TCI field included in the DCI. That is, a specific code point mapped to multiple TCI states can be indicated by the TCI field. When multiple TCI states are indicated, the UE can know that the related operation is an M-TRP operation. As an example, two or more TCI states related to the URLLC M-TRP operation can be indicated.

[0605] For example, the first time domain resource of the first transmission opportunity may be indicated based on the time domain resource allocation field included in the DCI. The size of the second time domain resource of the second transmission opportunity may be equal to the size of the first time domain resource. That is, even if the time domain resource of the second transmission opportunity is not separately indicated by the DCI, the time domain resource information of the second transmission opportunity may be derived from the time domain resource configuration of the first transmission opportunity. As an example, the number of symbols used for the first PDSCH transmission opportunity may be equal to the number of symbols of the second PDSCH transmission opportunity.

[0606] For example, the UE receiving the DCI in step S1930 ( Figure 21 to Figure 25 The operation of the reference numeral 100 / 200 in the figure can be performed as described below Figure 21 to Figure 25 For example, refer to Fig. 22 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to receive the DCI, and the one or more transceivers 106 may receive the DCI.

[0607] The UE may receive multiple PDSCH transmission opportunities (S1940). Multiple PDSCH transmission opportunities may be received based on the DCI. For example, the operation of receiving the PDSCH transmission opportunity may be interpreted / understood as an operation of receiving data through the PDSCH or an operation of receiving the PDSCH.

[0608] For example, the multiple transmission opportunities may be the same PDSCH transmission opportunities that are repeatedly transmitted / received, as described in the method (eg, Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.) In other words, the multiple PDSCH transmission opportunities may correspond to the same transport block.

[0609] For example, the number of multiple PDSCH transmission opportunities can be determined based on the number of TCI states indicated by the TCI field of the DCI. As described above, since multiple PDSCH transmission opportunities can be formed by repeatedly sending transmission opportunities corresponding to the same transport block, the number of multiple PDSCH transmission opportunities can refer to the number of times the PDSCH transmission opportunity is repeatedly sent. Based on a specific code point mapped to multiple TCI states indicated by the TCI field of the DCI, multiple PDSCH transmission opportunities can be received. In other words, the number of multiple PDSCH transmission opportunities can be determined based on the number of TCI states mapped to a specific code point. As an example, when multiple TCI states (e.g., 2 TCI states) are indicated by the TCI field of the DCI, the number of PDSCH transmission opportunities sent / received may also be equal to the number of multiple TCI states (e.g., 2 PDSCH transmission opportunities).

[0610] As a specific example, when the first TCI state and the second TCI state are indicated by the TCI field of the DCI, the UE can receive two PDSCH transmission opportunities, namely the first PDSCH transmission opportunity and the second PDSCH transmission opportunity. In this case, the first TCI state can correspond to the first PDSCH transmission opportunity, and the second TCI state can correspond to the second PDSCH transmission opportunity. In addition, the RV value of the first PDSCH transmission opportunity and the RV value of the second PDSCH transmission opportunity can be configured differently based on the RV field of the DCI.

[0611] As another example, the number of multiple PDSCH transmission opportunities may also be determined based on configuration information and DCI.As an example, candidate values ​​of the number of multiple PDSCH transmission opportunities may be indicated based on configuration information, and one of the candidate values ​​may be indicated / configured based on DCI.

[0612] For example, multiple PDSCH transmission opportunities (e.g., a first PDSCH transmission opportunity and a second PDSCH transmission opportunity) may be received in a time domain resource based on time division multiplexing (TDM). That is, multiple PDSCH transmission opportunities may be repeatedly received / sent in a non-overlapping time domain resource based on TDM.

[0613] For example, each PDSCH transmission opportunity may be composed of 2, 4 or 7 OFDM symbols. This may correspond to the minimum slot structure of PDSCH mapping type B described in the above-mentioned proposed method (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.). Multiple PDSCH transmission opportunities (e.g., the first transmission opportunity and the second transmission opportunity) may be TDM and multiplexed in one time slot. Alternatively, each PDSCH transmission opportunity may be time-division multiplexed and received as a unit of a time slot.

[0614] For example, multiple PDSCH transmission opportunities may be received in a time domain resource determined based on the DCI. As an example, a first PDSCH transmission opportunity may be received in a first time domain resource, and a second PDSCH transmission opportunity may be received in a second time domain resource. The first time domain resource and the second time domain resource may be placed in cascade with each other. Alternatively, the second time domain resource may also be placed separately from the first time domain resource by a specific symbol number. The specific symbol number may be replaced and represented by a gap symbol / shift symbol / symbol offset. The specific symbol number may be received by higher layer signaling.

[0615] For example, for each PDSCH transmission opportunity, the number of transmission layers may also be limited to a specific number of layers (eg, 2 layers) or less.

[0616] For example, in the above step S1940, a UE ( Figure 21 to Figure 25The operation of the reference numeral 100 / 200 in the figure can be performed as described below Figure 21 to Figure 25 For example, refer to Fig. 22 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to receive a plurality of PDSCH transmission opportunities, and the one or more transceivers 106 may receive a plurality of PDSCH transmission opportunities.

[0617] Fig. 20 An example of an operation flow chart of a base station (BS) performing data transmission and reception to which the method (eg, Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.) may be applied is illustrated. Fig. 20 It is only for the convenience of description and does not limit the scope of the present disclosure. In addition, it can be omitted according to the situation and / or configuration Fig. 20 Some of the steps shown in .

[0618] A BS may be a device collectively referred to as an object that performs data transmission and reception with a UE. For example, a base station may be a concept including one or more transmission points (TPs), one or more transmission and reception points (TRPs), and the like. In addition, the TP and / or TRP may include a panel, a transmission and reception unit, and the like of the BS. In addition, as described above, the TRP may be distinguished based on information (e.g., an index or ID) about a CORESET group (or CORESET pool). As an example, when one UE is configured to perform transmission / reception with multiple TRPs (or cells), this may mean that multiple CORESET groups (or CORESET pools) are configured for one UE. The configuration for the CORESET group (or CORESET pool) may be performed by higher layer signaling (e.g., RRC signaling).

[0619] The BS may send configuration information for the PDSCH to the UE (S2010). The configuration information may be received through higher layer signaling (e.g., RRC or MAC-CE). The configuration information may include information related to the method and / or embodiments described in the method (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.).

[0620] For example, the configuration information may include multiple TCI state configurations. Each TCI state configuration may include parameters for configuring a quasi co-location relationship between one or two downlink reference signals and a DM-RS port of a PDSCH.

[0621] For example, the configuration information may include CORESET-related configuration information (e.g., ControlResourceSet IE). The CORESET-related configuration information may include an ID related to the CORESET (e.g., controlResourceSetID), an index of a CORESET pool for the CORESET (e.g., CORESETPoolIndex), a time / frequency resource configuration of the CORESET, TCI information related to the CORESET, etc.

[0622] For example, the configuration information may include downlink channel related configuration (eg, PDCCH-Config, PDSCH-Config). The downlink channel related configuration may include DMRS maxLength, configuration type, mapping type, etc.

[0623] For example, the configuration information may include information about a transmission scheme for downlink data. Based on the information about the downlink data transmission scheme, eMBB operation or URLLC operation may be configured, or one of multiple schemes (e.g., SDM scheme, TDM scheme, or FDM scheme) related to URLLC operation may be indicated / configured. As an example, the configuration information may include a higher layer parameter (e.g., RepSchemeEnabler) for indicating one of the schemes for URLLC operation, and the relevant scheme may be configured by using a higher layer parameter to determine whether it is an FDM-based scheme (e.g., Scheme 2a / 2b) or a TDM-based scheme (Scheme 3 / 4).

[0624] For example, the configuration information may include information related to the number of transmission opportunities. As an example, the configuration information may include a parameter (e.g., repetitionnumber) for configuring the number of repetition transmissions of the transmission opportunity, and a specific number of repetitions (e.g., 2, 3, 4, 5, 6, 7, 8, or 16) may be indicated by the parameter. As another example, candidate values ​​for the number of multiple transmission opportunities may be indicated based on the configuration information.

[0625] For example, the configuration information may include information about the number of shift symbols between transmission opportunities. The shift symbol may be replaced by an expression such as a gap symbol or a symbol offset. As an example, the shift symbol may refer to the gap between the last symbol of the first transmission opportunity and the first symbol of the second transmission opportunity.

[0626] For example, in the above step S2010, the base station ( Figure 21 to Figure 25 The operation of the reference numerals 100 and / or 200) may be performed as described below. Figure 21 to Figure 25 For example, refer to Fig. 22, the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to send the configuration information, and the one or more transceivers 106 may send the configuration information.

[0627] The BS may send activation information to the UE (S2020). The activation information may be forwarded via MAC-CE. For example, some of the multiple TCI state configurations included in the configuration information may be activated based on the activation information. As an example, 64 TCI state configurations may be included in the configuration information, and 8 of the 64 TCI state configurations may be activated via the activation information. The activation information may include mapping information between the code point of the transmission configuration indication (TCI) field in the downlink control information (DCI) and the activated TCI state configuration.

[0628] For example, in the above step S2020, the base station UE ( Figure 21 to Figure 25 The operation of the reference numerals 100 and / or 200 in the figure may be performed as described below. Figure 21 to Figure 25 For example, refer to Fig. 22 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to send the activation information, and the one or more transceivers 106 may send the activation information.

[0629] The BS may transmit downlink control information (DCI) to the UE (S2030). The DCI may be transmitted through a downlink control channel (eg, PDCCH).

[0630] As described in the method (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.), the DCI may include at least one of a DMRS port-related field (e.g., (one or more) antenna port fields), a transport block-related field (e.g., an MCS / new data indicator / RV field), a transmission configuration indication (TCI) field, a time domain resource allocation field, or a redundancy version (RV) field.

[0631] For example, multiple TCI states can be indicated based on the TCI field included in the DCI. That is, a specific code point mapped to multiple TCI states can be indicated by the TCI field. When multiple TCI states are indicated, the UE can know that the related operation is an M-TRP operation. As an example, two or more TCI states related to the URLLC M-TRP operation can be indicated.

[0632] For example, the first time domain resource of the first transmission opportunity may be indicated based on the time domain resource allocation field included in the DCI. The size of the second time domain resource of the second transmission opportunity may be equal to the size of the first time domain resource. That is, even if the time domain resource of the second transmission opportunity is not separately indicated by the DCI, the time domain resource information of the second transmission opportunity may be derived from the time domain resource configuration of the first transmission opportunity. As an example, the number of symbols used for the first PDSCH transmission opportunity may be equal to the number of symbols of the second PDSCH transmission opportunity.

[0633] For example, in the above step S2030, the BS ( Figure 21 to Figure 25 The operation of the reference numeral 100 / 200 in the figure can be performed as described below Figure 21 to Figure 25 For example, refer to Fig. 22 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to send the DCI, and the one or more transceivers 106 may send the DCI.

[0634] The BS may send multiple PDSCH transmission opportunities (S2040). Multiple PDSCH transmission opportunities may be sent based on DCI. For example, the operation of sending the PDSCH transmission opportunity may be interpreted / understood as an operation of sending data through the PDSCH or an operation of sending the PDSCH.

[0635] For example, the multiple transmission opportunities may be the same PDSCH transmission opportunities that are repeatedly transmitted / received, as described in the method (eg, Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.) In other words, the multiple PDSCH transmission opportunities may correspond to the same transport block.

[0636] For example, the number of multiple PDSCH transmission opportunities can be determined based on the number of TCI states indicated by the TCI field of the DCI. As described above, since multiple PDSCH transmission opportunities can be formed by repeatedly sending transmission opportunities corresponding to the same transport block, the number of multiple PDSCH transmission opportunities can refer to the number of times the PDSCH transmission opportunity is repeatedly sent. Based on a specific code point mapped to multiple TCI states indicated by the TCI field of the DCI, multiple PDSCH transmission opportunities can be received. In other words, the number of multiple PDSCH transmission opportunities can be determined based on the number of TCI states mapped to a specific code point. As an example, when multiple TCI states (e.g., 2 TCI states) are indicated by the TCI field of the DCI, the number of PDSCH transmission opportunities sent / received may also be equal to the number of multiple TCI states (e.g., 2 PDSCH transmission opportunities).

[0637] As a specific example, when the first TCI state and the second TCI state are indicated by the TCI field of the DCI, the UE can receive two PDSCH transmission opportunities, namely the first PDSCH transmission opportunity and the second PDSCH transmission opportunity. In this case, the first TCI state can correspond to the first PDSCH transmission opportunity, and the second TCI state can correspond to the second PDSCH transmission opportunity. In addition, the RV value of the first PDSCH transmission opportunity and the RV value of the second PDSCH transmission opportunity can be configured differently based on the RV field of the DCI.

[0638] As another example, the number of multiple PDSCH transmission opportunities may also be determined based on configuration information and DCI.As an example, candidate values ​​of the number of multiple PDSCH transmission opportunities may be indicated based on configuration information, and one of the candidate values ​​may be indicated / configured based on DCI.

[0639] For example, multiple PDSCH transmission opportunities (e.g., a first PDSCH transmission opportunity and a second PDSCH transmission opportunity) may be received in a time domain resource based on time division multiplexing (TDM). That is, multiple PDSCH transmission opportunities may be repeatedly received / sent in a non-overlapping time domain resource based on TDM.

[0640] For example, each PDSCH transmission opportunity may be composed of 2, 4 or 7 OFDM symbols. This may correspond to the minimum slot structure of PDSCH mapping type B described in the above-mentioned proposed method (e.g., Proposal 1 / Proposal 2 / Proposal 3 / Proposal 4, etc.). Multiple PDSCH transmission opportunities (e.g., the first transmission opportunity and the second transmission opportunity) may be TDM and multiplexed in one time slot. Alternatively, each PDSCH transmission opportunity may be time-division multiplexed and received as a unit of a time slot.

[0641] For example, multiple PDSCH transmission opportunities may be received in a time domain resource determined based on the DCI. As an example, a first PDSCH transmission opportunity may be received in a first time domain resource, and a second PDSCH transmission opportunity may be received in a second time domain resource. The first time domain resource and the second time domain resource may be placed in cascade with each other. Alternatively, the second time domain resource may also be placed separately from the first time domain resource by a specific symbol number. The specific symbol number may be replaced and represented by a gap symbol / shift symbol / symbol offset. The specific symbol number may be received by higher layer signaling.

[0642] For example, for each PDSCH transmission opportunity, the number of transmission layers may also be limited to a specific number of layers (eg, 2 layers) or less.

[0643] For example, in the above step S2040, a UE ( Figure 21 to Figure 25The operation of the reference numeral 100 / 200 in the figure can be performed as described below Figure 21 to Figure 25 For example, refer to Fig. 22 , the one or more processors 102 may control the one or more transceivers 106 and / or the one or more memories 104 to send a plurality of PDSCH transmission opportunities, and the one or more transceivers 106 may send a plurality of PDSCH transmission opportunities.

[0644] As described above, network-side / UE signaling and operations (e.g., Proposals 1 / 2 / 3 / 4, Fig.18 / 19 / 20, etc.) can be provided by the devices described below (e.g., Figures 21 to 25 ). For example, the network side (e.g., TRP 1 / TRP 2) may correspond to the first wireless device, and the UE may correspond to the second wireless device, and in some cases, the opposite situation may also be considered. For example, the first device (e.g., TRP 1) / the second device (e.g., TRP 2) may correspond to the first wireless device, and the UE may correspond to the second wireless device, and in some cases, the opposite situation may also be considered.

[0645] For example, network side / UE signaling / operation (e.g., Proposal 1 / 2 / 3 / 4 / Fig.18 / 19 / 20 etc.) can be Figures 21 to 25 One or more processors (e.g., 102 and 202) in the processing, and network side / UE signaling and operations (e.g., Proposal 1 / 2 / 3 / 4 / Fig.18 / 19 / 20, etc.) can be used to drive Figures 21 to 25 The instructions / programs (eg, instructions and executable code) of at least one processor (eg, 102 and 202) are stored in one or more memories (eg, Fig.21 104 and 204).

[0646] According to an embodiment of the present disclosure, a device may include one or more memories and one or more processors operably coupled to the one or more memories, and the one or more processors may control the device to: receive configuration information for PDSCH; receive activation information; receive DCI including a TCI field; and receive multiple PDSCH transmission opportunities based on specific code points mapped to multiple TCI states indicated by the TCI field, and the configuration information may include multiple TCI state configurations, some of the multiple TCI state configurations may be activated based on the activation information, and the activation information may include mapping information between the code points of the transmission configuration indication (TCI) field in the downlink control information (DCI) and the activated TCI state configuration, multiple PDSCH transmission opportunities may correspond to the same transport block, multiple PDSCH transmission opportunities may be received in time domain resources based on time division multiplexing (TDM), and the number of multiple PDSCH transmission opportunities may be determined based on the number of TCI states mapped to a specific code point.

[0647] According to an embodiment of the present disclosure, in one or more non-transitory computer-readable media storing one or more instructions, one or more instructions executable by one or more processors may include: instructions instructing a user equipment (UE) to perform the following operations: receiving configuration information for PDSCH; receiving activation information; receiving DCI including a TCI field; and receiving multiple PDSCH transmission opportunities based on specific code points mapped to multiple TCI states indicated by the TCI field, and the configuration information may include multiple TCI state configurations, some of the multiple TCI state configurations may be activated based on the activation information, and the activation information may include mapping information between the code points of the transmission configuration indication (TCI) field in the downlink control information (DCI) and the activated TCI state configuration, multiple PDSCH transmission opportunities may correspond to the same transport block, multiple PDSCH transmission opportunities may be received in time domain resources based on time division multiplexing (TDM), and the number of multiple PDSCH transmission opportunities may be determined based on the number of TCI states mapped to a specific code point.

[0648] Examples of communication systems applicable to the present disclosure

[0649] The various descriptions, functions, processes, proposals, methods and / or operational flowcharts of the present disclosure described in this document may be applied to, but not limited to, various fields requiring wireless communication / connection between devices (e.g., 5G).

[0650] Hereinafter, a detailed description will be made with reference to the accompanying drawings. In the following drawings / descriptions, unless otherwise specified, the same reference numerals may represent the same or corresponding hardware blocks, software blocks or functional blocks.

[0651] Fig.21 The diagram illustrates a communication system applied to the present disclosure.

[0652] refer to Fig.21 , the communication system applied to the present disclosure includes a wireless device, a base station (BS) and a network. Here, the wireless device refers to a device that uses a radio access technology (RAT) (e.g., 5G new RAT (NR)) or a long-term evolution (LTE) to perform communication, and may be referred to as a communication / radio / 5G device. The wireless device may include, but is not limited to, a robot 1010a, a vehicle 1010b-1 and 1010b-2, an extended reality (XR) device 1010c, a handheld device 1010d, a home appliance 1010e, an Internet of Things (IoT) device 1010f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous driving vehicle, and a vehicle capable of communicating between vehicles. Here, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device, and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, and the like. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., laptops). Home appliances may include televisions, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, the BS and the network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node relative to other wireless devices.

[0653] The wireless devices 1010a to 1010f may be connected to the network 300 through the BS 1020. AI technology may be applied to the wireless devices 1010a to 1010f, and the wireless devices 1010a to 1010f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 1010a to 1010f may communicate with each other through the BS 1020 / network 300, the wireless devices 1010a to 1010f may perform direct communication (e.g., sidelink communication) with each other without going through the BS / network. For example, the vehicles 1010b-1 and 1010b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 1010a to 1010f.

[0654] Wireless communication / connection 150a, 150b or 150c can be established between wireless devices 1010a to 1010f / BS 1020 or BS 1020 / BS 1020. Here, wireless communication / connection can be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication) or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). The wireless device and the BS / wireless device can send / receive radio signals to each other through wireless communication / connection 150a and 150b. For example, wireless communication / connection 150a and 150b can send / receive signals through various physical channels. To this end, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation and resource mapping / demapping), and at least a portion of the resource allocation process can be performed based on various suggestions of the present disclosure.

[0655] Examples of wireless devices suitable for the present disclosure

[0656] Fig. 22 The diagram illustrates a wireless device suitable for use with the present disclosure.

[0657] refer to Fig. 22 , the first wireless device 100 and the second wireless device 200 may transmit radio signals via various RATs (e.g., LTE and NR). Here, {the first wireless device 100 and the second wireless device 200} may correspond to Fig.21 {wireless device 1010x and BS 1020} and / or {wireless device 1010x and wireless device 1010x}.

[0658] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106, and may be configured to implement the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processor 102 may process the information in the memory 104 to generate first information / signals, and then transmit a radio signal including the first information / signals through the transceiver 106. The processor 102 may receive a radio signal including second information / signals through the transceiver 106, and then store information obtained by processing the second information / signals in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software codes including commands for executing part or all of the processes controlled by the processor 102, or for executing the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and send and / or receive radio signals through one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0659] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver (206), and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor 202 may process the information in the memory 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the transceiver 206. The processor 202 may receive a radio signal including fourth information / signals through the transceiver 206, and then store information obtained by processing the fourth information / signals in the memory 204. The memory 204 may be connected to the memory 204, and may store various information related to the operation of the processor 202. For example, the memory 204 may store software codes including commands for executing part or all of the processes controlled by the processor or for executing the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and send and / or receive radio signals through one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0660] In the following, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but not limited to, one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. The one or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document, and provide the generated signal to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from the one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document.

[0661] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be included in one or more processors 102 and 202, or may be stored in one or more memories 104 and 204 so as to be driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of code, commands, and command sets.

[0662] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories 104 and 204 may be configured by read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, registers, buffer memory, computer-readable storage media, and / or combinations thereof. One or more memories 104 and 204 may be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0663] One or more transceivers 106 and 206 can send user data, control information and / or radio signals / channels mentioned in the method and / or operation flow chart of this document to one or more other devices. One or more transceivers 106 and 206 can receive user data, control information and / or radio signals / channels mentioned in the description, function, process, proposal, method and / or operation flow chart disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 can be connected to one or more processors 102 and 202 and send and receive radio signals. For example, one or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can send user data, control information or radio signals to one or more other devices. One or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can receive user data, control information or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information and / or radio signals / channels mentioned in the description, functions, processes, proposals, methods and / or operation flow charts disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc. from RF band signals to baseband signals, so as to facilitate processing of received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0664] Examples of signal processing circuits to which the present disclosure is applied

[0665] Fig.23 The diagram shows the signal processing circuit used to transmit the signal.

[0666] refer to Fig.23 , the signal processing circuit 1000 may include a scrambler 1010 , a modulator 1020 , a layer mapper 1030 , a precoder 1040 , a resource mapper 1050 , and a signal generator 1060 . Fig.23 The operations / functions can be performed by but not limited to Fig. 22 The processors 102 and 202 and / or the transceivers 106 and 206 are executed. Fig.23The hardware components can be Fig. 22 For example, blocks 1010 to 1060 may be implemented by processors 102 and 202 and / or transceivers 106 and 206. Fig. 22 In addition, blocks 1010 to 1050 may be implemented by processors 102 and 202. Fig. 22 102 and 202, and block 1060 may be implemented by Fig. 22 The transceivers 106 and 206 are implemented.

[0667] Codewords can be passed Fig.23 The signal processing circuit 1000 is converted into a radio signal. In this article, a codeword is a coded bit sequence of an information block. An information block may include a transport block (e.g., UL-SCH transport block, DL-SCH transport block). The radio signal may be transmitted through various physical channels (e.g., PUSCH and PDSCH).

[0668] Specifically, the codeword can be converted into a scrambled bit sequence by the scrambler 1010. A scrambling sequence for scrambling can be generated based on an initialization value, and the initialization value can include the ID information of the wireless device. The scrambled bit sequence can be modulated into a modulation symbol sequence by the modulator 1020. The modulation scheme may include pi / 2-binary phase shift keying (pi / 2-BPSK), m-phase shift keying (m-PSK), and m-quadrature amplitude modulation (m-QAM). The complex modulation symbol sequence can be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbol of each transmission layer can be mapped (precoded) to the corresponding antenna port by the precoder 1040. The output z of the precoder 1040 can be obtained by multiplying the output y of the layer mapper 1030 by the N*M precoding matrix W. In this article, N is the number of antenna ports and M is the number of transmission layers. The precoder 1040 can perform precoding after performing transform precoding (e.g., DFT) on the complex modulation symbol. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

[0669] The resource mapper 1050 may map the modulation symbols of each antenna port to time-frequency resources. The time-frequency resources may include multiple symbols in the time domain (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) and multiple subcarriers in the frequency domain. The signal generator 1060 may generate a radio signal from the mapped modulation symbols and may send the generated radio signal to other devices through each antenna. For this purpose, the signal generator 1060 may include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), and a frequency up-converter.

[0670] The signal processing for the signal received in the wireless device can be performed in Fig.23 The signal processing processes 1010 to 1060 are configured in the opposite manner. For example, a wireless device (e.g., Fig. 22 100 and 200) can receive a radio signal from the outside through an antenna port / transceiver. The received radio signal can be converted into a baseband signal by a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a fast Fourier transform (FFT) module. Next, the baseband signal can be restored to a codeword through a resource demapping process, a post-coding process, a demodulation processor, and a descrambling process. The codeword can be restored to the original information block by decoding. Therefore, a signal processing circuit (not shown) for receiving a signal may include a signal restorer, a resource demapper, a post-encoder, a demodulator, a descrambler, and a decoder.

[0671] Examples of wireless devices applicable to the present disclosure

[0672] Fig.24 Another example of a wireless device applied to the present disclosure is shown. The wireless device can be implemented in various forms according to the use case / service (refer to Fig.21 ).

[0673] refer to Fig.24 , the wireless devices 100 and 200 may correspond to Fig. 22 The wireless devices 100 and 200 may be configured by various elements, components, units / parts and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130 and an additional component 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include Fig. 22 One or more processors 102 and 202 and / or one or more memories 104 and 204 in the embodiment. For example, the transceiver 114 may include Fig. 22 The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 can control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the storage unit 130. The control unit 120 can send the information stored in the storage unit 130 to the outside (e.g., other communication devices) through the wireless / wired interface via the communication unit 110 or store the information received from the outside (e.g., other communication devices) through the wireless / wired interface in the storage unit 130 via the communication unit 110.

[0674] The additional components 140 may be configured differently depending on the type of wireless device. For example, the additional components 140 may include at least one of a power unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured in a manner other than, but not limited to, Fig.21 The robot 100a, Fig.21 The vehicles 100b-1 and 100b-2, Fig.21 XR device 100c, Fig.21 Portable device 100d, Fig.21 Home appliances 100e, Fig.21 IoT devices 100f, digital broadcast terminals, holographic devices, public safety devices, MTC devices, medical devices, fintech devices (or financial devices), security devices, climate / environmental devices, Fig.21 AI server / device 400, Fig.21 The wireless device may be implemented in the form of a BS 200, a network node, etc. Depending on the use case / service, the wireless device may be used in a mobile or fixed location.

[0675] exist Fig.24 In the wireless devices 100 and 200, the entirety of the various elements, components, units / parts and / or modules in the wireless devices 100 and 100 may be connected to each other through a wired interface, or at least a portion thereof may be wirelessly connected through a communication unit. For example, in each of the wireless devices 100 and 100, the control unit 120 and the communication unit 110 may be connected by wire, and the control unit 120 and the first unit (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. Each element, component, unit / part and / or module within the wireless devices 100 and 200 may further include one or more elements. For example, the control unit 120 may be configured by a set of one or more processors. As an example, the control unit 120 may be configured by a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit and a memory control processor. As another example, the memory 130 may be configured by a random access memory (RAM), a dynamic RAM (DRAM), a read-only memory (ROM), a flash memory, a volatile memory, a non-volatile memory and / or a combination thereof.

[0676] Examples of Handheld Devices Applicable to the Present Disclosure

[0677] Fig.25 The handheld device applied to the present disclosure is shown. The handheld device may include a smart phone, a smart board, a wearable device (e.g., a smart watch or smart glasses), or a portable computer (e.g., a notebook). The handheld device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

[0678] refer to Fig.25 , the handheld device 1010 may include an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an I / O unit 140c. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 to 130 / 140a to 140c correspond to Fig.24 Frame 110 to 130 / 140.

[0679] The communication unit 110 may send signals (e.g., data and control signals) to other wireless devices or BSs and receive signals (e.g., data and control signals) from other wireless devices or BSs. The control unit 120 may perform various operations by controlling the constituent elements of the handheld device 1010. The control unit 120 may include an application processor (AP). The memory unit 130 may store data / parameters / programs / codes / commands required to drive the handheld device 100. The memory unit 130 may store input / output data / information. The power supply unit 140a may supply power to the handheld device 1010 and include a wired / wireless charging circuit, a battery, etc. The interface unit 140b may support the connection of the handheld device 1010 to other external devices. The interface unit 140b may include various ports (e.g., audio I / O ports and video I / O ports) for connecting to external devices. The I / O unit 140c may input or output video information / signals, audio information / signals, data and / or information input by a user. The I / O unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module.

[0680] As an example, in the case of data communication, the I / O unit 140c can acquire information / signals (e.g., touch, text, voice, image, or video) input by the user and can store the acquired information / signals in the memory unit 130. The communication unit 110 can convert the information / signals stored in the memory into radio signals and directly send the converted radio signals to other wireless devices or to the BS. The communication unit 110 can receive radio signals from other wireless devices or BSs and then restore the received radio signals to the original information / signals. The restored information / signals can be stored in the memory unit 130 and can be output as various types (e.g., text, voice, image, video, or tactile) through the I / O unit 140c.

[0681] Here, the wireless communication technology implemented in the wireless devices 100 and 200 of the present specification may include narrowband Internet of Things for low-power communication, as well as LTE, NR and 6G. At this time, for example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology, which may be implemented in standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above names. In addition, or in other words, the wireless communication technology implemented in the wireless devices 100 and 200 of the present specification may be based on LTE-M technology for communication. In this case, as an example, LTE-M technology may be an example of LPWAN technology, and may be referred to as various names, such as enhanced machine type communication (eMTC). For example, LTE-M technology is 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-bandwidth limited), 5) LTE-MTC, 6) LTE machine type communication, and / or 7) may be implemented in at least one of various standards such as LTE M, and is not limited to the above names. In addition or alternatively, considering low-power communication, the wireless communication technology implemented in the wireless devices 100 and 200 of the present specification is at least one of ZigBee, Bluetooth, and a low-power wide area network (LPWAN). Any one of them may be included, and is not limited to the above names. For example, ZigBee technology can create a PAN (Personal Area Network) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and can be called by various names.

[0682] The above-mentioned embodiments are realized by combining the components and features of the present disclosure in a predetermined manner. Unless otherwise specified, each component or feature should be considered selectively. Each component or feature can be implemented without being combined with another component or feature. In addition, some components and / or features are combined with each other and can realize the embodiments of the present disclosure. The order of operations described in the embodiments of the present disclosure can be changed. Some components or features of an embodiment can be included in another embodiment, or can be replaced by corresponding components or features of another embodiment. It is obvious that some claims citing specific claims can be combined with other claims of claims other than citing specific claims to constitute embodiments, or new claims can be added by amendment after submitting the application.

[0683] The embodiments of the present disclosure may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. When the embodiments are implemented by hardware, an embodiment of the present disclosure may be implemented by 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.

[0684] When the embodiment is implemented by firmware or software, an embodiment of the present disclosure may be implemented by a module, process, function, etc. that performs the above functions or operations. The software code may be stored in a memory and may be driven by a processor. The memory is provided inside or outside the processor and may exchange data with the processor in various well-known ways.

[0685] It is obvious to those skilled in the art that the present disclosure may be embodied in other specific forms without departing from the essential features of the present disclosure. Therefore, the foregoing detailed description should not be interpreted as limiting in all aspects, but should be considered as illustrative. The scope of the present disclosure should be determined by the reasonable interpretation of the attached claims, and all modifications within the equivalent scope of the present disclosure are included within the scope of the present disclosure.

[0686] Industrial Availability

[0687] Although the method of sending and receiving PDSCH in the wireless communication system of the present disclosure has been described with reference to an example applied to a 3GPP LTE / LTE-A system or a 5G system (new RAT system), the scheme can be applied to various wireless communication systems other than the 3GPP LTE / LTE-A system or the 5G system.

Claims

1. A method comprising: Receive configuration information, The configuration information includes a plurality of transmission configuration indication (TCI) states, wherein the number of the plurality of TCI states depends on the capability of a user equipment (UE); receiving an activation command based on a medium access control (MAC) control element (CE), wherein the activation command is used to map up to 8 TCI states of the plurality of TCI states to code points of a TCI field; receiving downlink control information (DCI) including the TCI field, wherein a number of TCI states are indicated based on a code point of the TCI field; and receiving multiple physical downlink shared channel (PDSCH) transmission opportunities of the same transport block (TB) within a time slot, wherein, based on time domain resource allocation associated with time division multiplexing (TDM), receiving each of the plurality of PDSCH transmission opportunities to which one TCI state of the plurality of TCI states and a redundancy version (RV) are applied, and Wherein, the number of the multiple PDSCH transmission opportunities is determined based on the number of the several TCI states.

2. The method according to claim 1, in, Based on the code point, indicating a first TCI state and a second TCI state, The first TCI state is applied to a first PDSCH transmission timing, and the second TCI state is applied to a second PDSCH transmission timing.

3. The method according to claim 2, in, The time domain resource to which each of the plurality of PDSCH transmission opportunities is mapped includes 2, 4 or 7 OFDM symbols.

4. The method according to claim 2, in, The DCI further includes a time domain resource allocation field, The first time domain resource of the first PDSCH transmission opportunity is indicated based on the time domain resource allocation field.

5. The method according to claim 4, in, The size of the second time domain resource of the second PDSCH transmission opportunity is the same as the size of the first time domain resource.

6. The method according to claim 5, in, The first time domain resource and the second time domain resource are adjacent to each other.

7. The method according to claim 6, in, The first symbol of the second time domain resource is separated from the last symbol of the first time domain resource by a specific number of symbols.

8. The method according to claim 7, in, The specific number of symbols is received through higher layer signaling.

9. A user equipment (UE), comprising: one or more transceivers; one or more processors; as well as one or more memories for storing instructions for operations performed by the one or more processors and coupled to the one or more processors; The operations include: Receive configuration information, The configuration information includes a plurality of transmission configuration indication (TCI) states, wherein the number of the plurality of TCI states depends on the capability of the UE; receiving an activation command based on a medium access control (MAC) control element (CE), wherein the activation command is used to map up to 8 TCI states of the plurality of TCI states to code points of a TCI field; receiving downlink control information (DCI) including the TCI field, wherein a number of TCI states are indicated based on a code point of the TCI field; and receiving multiple physical downlink shared channel (PDSCH) transmission opportunities of the same transport block (TB) within a time slot, wherein, based on time domain resource allocation associated with time division multiplexing (TDM), receiving each of the plurality of PDSCH transmission opportunities to which one TCI state of the plurality of TCI states and a redundancy version (RV) are applied, and Wherein, the number of the multiple PDSCH transmission opportunities is determined based on the number of the several TCI states.

10. A method comprising: Sending configuration information to a user equipment (UE), The configuration information includes a plurality of transmission configuration indication (TCI) states, wherein the number of the plurality of TCI states depends on the capability of the UE; sending an activation command to the UE, the activation command being based on a medium access control (MAC) control element (CE), wherein the activation command is used to map up to 8 TCI states of the plurality of TCI states to code points of a TCI field; sending downlink control information (DCI) including the TCI field to the UE, wherein a number of TCI states are indicated based on a code point of the TCI field; and sending a plurality of physical downlink shared channel (PDSCH) transmission opportunities of the same transport block (TB) within a time slot to the UE, wherein, based on time domain resource allocation associated with time division multiplexing (TDM), one TCI state of the plurality of TCI states and one redundancy version (RV) are applied to each of the plurality of PDSCH transmission opportunities, and Wherein, the number of the multiple PDSCH transmission opportunities is determined based on the number of the several TCI states.

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