Method for transport block transmission and reception and device using same in wireless communication system

Abstract

Provided are an operation method of a device in a wireless communication system, and a device using the method. The method comprises: receiving, by a terminal, downlink control information (DCI) for scheduling a plurality of transport blocks from a base station through a control channel; and receiving the plurality of transport blocks from the base station through a shared channel, wherein the terminal receives, from the base station, multiplexing information indicating a multiplexing method for the plurality of transport blocks in the shared channel, and the terminal applies fields of the DCI on the basis of the multiplexing information.

Description

Method for transmitting and receiving transmission blocks in a wireless communication system and a device using the method

[0001] The present disclosure relates to a method for transmitting and receiving a transmission block of a device in a wireless communication system and a device using the method.

[0002] As more and more communication devices demand greater communication capacity, the need for improved mobile broadband communications over existing radio access technology (RAT) is emerging. Furthermore, massive Machine Type Communications (MTC), which connects numerous devices and objects to provide diverse services anytime, anywhere, is also a key issue to be considered in next-generation communications. Furthermore, communication system design that considers reliability and latency-sensitive services / terminals is being discussed. The introduction of next-generation radio access technologies that take enhanced mobile broadband communications, massive MTC, and URLLC (Ultra-Reliable and Low Latency Communication) into account is being discussed. For convenience, these technologies are referred to herein as new RAT or NR.

[0003] In the NR system, a maximum of two transport blocks (TBs) can be transmitted over a single physical channel. However, the two transport blocks are transmitted over the same time / frequency resources and may be mapped to different spatial layers. That is, in NR, when transmitting multiple transport blocks over a single physical channel, the multiple transport blocks cannot be transmitted using different time / frequency resources.

[0004] Additionally, in NR, a terminal may not be able to simultaneously receive or transmit two physical channels with overlapping transmission time resources. In this case, the terminal may not be able to receive or transmit multiple physical channels using different frequency resources within the same time resource.

[0005] The technical problem to be solved by the present disclosure is to provide a method for transmitting and receiving a transmission block of a device in a wireless communication system and a device using the method.

[0006] A method for transmitting and receiving transport blocks by a device in a wireless communication system is provided. According to the method, a terminal receives downlink control information (DCI) scheduling a plurality of transport blocks from a base station through a control channel, and receives the plurality of transport blocks from the base station through a shared channel, wherein the terminal receives multiplexing information from the base station indicating a multiplexing method of the plurality of transport blocks in the shared channel, and applies fields of the DCI based on the multiplexing information.

[0007] In another aspect, a terminal for executing the above method, a chipset of the terminal, and a computer-readable medium are provided.

[0008] In another aspect, a method of operating a base station and a base station using the method are provided. According to the method, the base station transmits downlink control information (DCI) scheduling a plurality of transport blocks to a terminal through a control channel, and transmits the plurality of transport blocks to the terminal through a shared channel, wherein the base station provides multiplexing information indicating a multiplexing method of the plurality of transport blocks in the shared channel to the terminal, and fields of the DCI are characterized in that they are interpreted based on the multiplexing information.

[0009] There may be environments where channel quality differs depending on the frequency / time resource region in which a single physical channel is transmitted. In such environments, modulation and coding schemes (MCS), the number of layers / ranks, and / or precoders appropriate for the transmission of the physical channel may differ depending on the frequency / time resource region. According to the method according to the present disclosure, fields of DCI for scheduling the plurality of transport blocks are applied (interpreted) based on multiplexing information indicating a multiplexing method of the plurality of transport blocks in a shared channel. This enables transmission of transport blocks through a physical channel using an MCS, the number of layers / ranks, and / or a precoder appropriate for the channel quality depending on the resource region, thereby increasing the throughput of the system and improving its performance.

[0010] The effects that can be obtained from the embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the technical configuration of the present disclosure is applied, from the description of the embodiments of the present disclosure below. In other words, unintended effects resulting from implementing the configuration described in the present disclosure can also be derived from the embodiments of the present disclosure by those skilled in the art.

[0011] Figure 1 illustrates the system architecture of a New Generation Radio Access Network (NG-RAN) to which NR is applied.

[0012] Figure 2 is a block diagram showing a radio protocol architecture for a user plane.

[0013] Figure 3 is a block diagram showing the wireless protocol structure for the control plane.

[0014] Figure 4 illustrates the functional division between NG-RAN and 5GC.

[0015] Figure 5 illustrates a frame structure that can be applied in NR.

[0016] Figure 6 shows an example of a resource grid in NR.

[0017] Figure 7 shows an example of a physical resource block in NR.

[0018] Figure 8 illustrates the slot structure of an NR frame.

[0019] Figure 9 illustrates a core set.

[0020] Figure 10 illustrates an example of a slot structure for a new wireless access technology.

[0021] Figure 11 illustrates the structure of a self-contained slot.

[0022] Figure 12 illustrates physical channels and typical signal transmission.

[0023] Figure 13 illustrates an example of a flexible network topology to which embodiments of the present specification may be applied.

[0024] Figure 14 illustrates a method of applying full duplex within a carrier.

[0025] Figure 15 shows an example in which time resources operating in HD (half duplex) and time resources operating in FD (full duplex), such as SB-FD or SS-FD, coexist.

[0026] Figure 16 illustrates a frequency resource through which two TBs are transmitted.

[0027] Figure 17 illustrates an operation method of the terminal.

[0028] Figure 18 illustrates the signaling process and operation between a base station and a terminal.

[0029] Figure 19 illustrates a wireless device applicable to the present specification.

[0030] Figure 20 illustrates another example of a wireless device.

[0031] Figure 21 illustrates an example of a signal processing module structure.

[0032] Figure 22 illustrates another example of the structure of a signal processing module within a transmission device.

[0033] FIG. 23 illustrates an example of a wireless communication device according to an implementation example of the present disclosure.

[0034] Fig. 24 illustrates a communication system (1) applicable to this specification.

[0035] As used herein, "A or B" can mean "only A," "only B," or "both A and B." In other words, as used herein, "A or B" can be interpreted as "A and / or B." For example, as used herein, "A, B or C" can mean "only A," "only B," "only C," or "any combination of A, B and C."

[0036] As used herein, a slash ( / ) or a comma can mean "and / or." For example, "A / B" can mean "A and / or B." Accordingly, "A / B" can mean "only A," "only B," or "both A and B." For example, "A, B, C" can mean "A, B, or C."

[0037] In this specification, "at least one of A and B" may mean "only A", "only B" or "both A and B". Additionally, in this specification, the expressions "at least one of A or B" or "at least one of A and / or B" may be interpreted identically to "at least one of A and B".

[0038] Additionally, in this specification, “at least one of A, B and C” can mean “only A,” “only B,” “only C,” or “any combination of A, B and C.” Additionally, “at least one of A, B or C” or “at least one of A, B and / or C” can mean “at least one of A, B and C.”

[0039] Additionally, parentheses used herein may mean "for example." Specifically, when "control information (ABC)" is indicated, "ABC" may be described as an example of "control information." For example, "control information" may include DEF as another example. In other words, "control information" in this specification is not limited to "ABC," and "ABC" may be described as an example of "control information." Furthermore, even when indicated as "control information (i.e., ABC)," "ABC" may be described as an example of "control information."

[0040] Additionally, in this specification, terms such as “first,” “second,” etc. are used only for the purpose of distinguishing one component from another, and are not used to limit the components, and do not limit the order or importance between the components unless specifically limited. Accordingly, a first component in one embodiment of this specification may be referred to as a second component in another embodiment, and similarly, a second component in one embodiment may be referred to as a first component in another embodiment.

[0041] In the following explanation, ‘when, if, in case of’ can be replaced with ‘based on’.

[0042] Technical features individually described within a single drawing in this specification may be implemented individually or simultaneously. The following drawings are designed to illustrate specific examples of this specification. The names of specific devices and the names of specific signals, messages, and fields depicted in the drawings are provided for illustrative purposes only, and therefore, the technical features of this specification are not limited to the specific names used in the drawings.

[0043] In this specification, a terminal is a user equipment (UE) or a consumer-side device, and may also be referred to as a first node that receives / transmits signals from / to a base station / second node / IAB node / TRP (Transmission-Reception Point). A terminal may correspond to a physical node or a logical node. A terminal may correspond to an endpoint on the user side, or may correspond to an intermediate point between other endpoints. In communication between two points that are not limited to endpoints (including one-to-one / many-to-one / one-to-many / many-to-many communication), a terminal may correspond to a served node. A terminal may be a node with a fixed location, or a node with an unfixed location (or mobile).

[0044] In this specification, a base station (BS) is a device on the network side, and may be referred to as a second node / IAB node / x-NodeB (x-NodeB, x may be an abbreviation related to radio access technology (RAT)) / TRP. A BS may correspond to a physical node or a logical node. A BS may correspond to an endpoint on the network side, or may correspond to an intermediate point between other endpoints. In communication between two points that are not limited to endpoints (including one-to-one / many-to-one / one-to-many / many-to-many communication), a BS may correspond to a serving node. A BS may be a node with a fixed location, or a node with an unfixed location.

[0045] In this specification, higher layer parameters may be set for the terminal, preset, or predefined. For example, the base station may transmit higher layer parameters to the terminal. For example, the terminal may transmit parameters such as capabilities to the base station as higher layer parameters. For example, the higher layer parameters may be transmitted via radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0046] In this specification, the information / state / parameter being “configured or pre-configured” can be interpreted as the information / state / parameter being provided / pre-provided to the terminal through pre-defined signaling (e.g., SIB, MAC, RRC) from the base station. In this specification, the information / state / parameter being “defined or pre-defined” can be interpreted as the information / state / parameter being known in advance or pre-stored at the base station and the terminal without signaling between the base station and the terminal.

[0047] The technology described in this specification can be used in various wireless communication systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access). CDMA can be implemented with wireless technologies such as UTRA (universal terrestrial radio access) or CDMA2000. TDMA can be implemented with wireless technologies such as GSM (global system for mobile communications) / GPRS (general packet radio service) / EDGE (enhanced data rates for GSM evolution). OFDMA can be implemented with wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (evolved UTRA), LTE (long term evolution), and 5G NR.

[0048] The technology described in this specification can be implemented with 6G wireless technology and applied to various 6G systems. For example, the 6G system can have key factors such as enhanced mobile broadband (eMBB), ultra-reliable low latency communications (URLLC), massive machine-type communication (mMTC), artificial intelligence (AI) integrated communication, tactile internet, high throughput, high network capacity, high energy efficiency, low backhaul and access network congestion, and enhanced data security.

[0049] Hereinafter, 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 downlink, a transmitter may be part of a base station, and a receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal, and a receiver may be part of a base station. A base station may be expressed as a first communication device, and a terminal may be expressed as a second communication device. A base station (BS) may be replaced by terms such as a fixed station, Node B, eNB (evolved-NodeB), gNB (Next Generation NodeB), BTS (base transceiver system), access point (AP: Access Point), network (5G network), AI (Artificial Intelligence) system / module, RSU (road side unit), robot, drone (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) device, VR (Virtual Reality) device, etc.In addition, the terminal may be fixed or mobile, and may be replaced with terms such as UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advanced Mobile Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, vehicle, RSU (road side unit), robot, AI (Artificial Intelligence) module, drone (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) device, VR (Virtual Reality) device, etc.

[0050] The following technologies can be used in various wireless access systems, such as CDMA, FDMA, TDMA, OFDMA, and SC-FDMA. UTRA is part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A (Advanced) / 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.

[0051] For clarity, the description is based on the 3GPP communication system (e.g., LTE-A, NR), but the technical idea of ​​the present disclosure is not limited thereto. LTE refers to technology after 3GPP TS 36.xxx Release 8. Specifically, LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 is referred to as LTE-A pro. 3GPP NR refers to technology after TS 38.xxx Release 15. LTE / NR may be referred to as a 3GPP system. "xxx" refers to a standard document detail number. LTE / NR may be collectively referred to as a 3GPP system. For background technology, terms, abbreviations, etc. used in the description of the present disclosure, reference may be made to matters described in standard documents published prior to the present disclosure. For example, reference may be made to the following documents:

[0052] 3GPP LTE

[0053] - 36.211: Physical channels and modulation

[0054] - 36.212: Multiplexing and channel coding

[0055] - 36.213: Physical layer procedures

[0056] - 36.300: Overall description

[0057] - 36.331: Radio Resource Control (RRC)

[0058] 3GPP NR

[0059] - 38.211: Physical channels and modulation

[0060] - 38.212: Multiplexing and channel coding

[0061] - 38.213: Physical layer procedures for control

[0062] - 38.214: Physical layer procedures for data

[0063] - 38.300: NR and NG-RAN Overall Description

[0064] - 36.331: Radio Resource Control (RRC) protocol specification

[0065] 이하에서, 아래의 정의 및 약어(Definition and Abbreviations)를 사용할 수 있다.

[0066] BM: beam management

[0067] CQI: channel quality indicator

[0068] CRI: CSI-RS (channel state information - reference signal) resource indicator

[0069] CSI: channel state information

[0070] CSI-IM: channel state information - interference measurement

[0071] CSI-RS: channel state information - reference signal

[0072] DMRS: demodulation reference signal

[0073] FDM: frequency division multiplexing

[0074] FFT: fast Fourier transform

[0075] IFDMA: interleaved frequency division multiple access

[0076] IFFT: inverse fast Fourier transform

[0077] L1-RSRP: Layer 1 reference signal received power

[0078] L1-RSRQ: Layer 1 reference signal received quality

[0079] MAC: medium access control

[0080] MCS: Modulation and coding scheme

[0081] NZP: non-zero power

[0082] OFDM: orthogonal frequency division multiplexing

[0083] PDCCH: physical downlink control channel

[0084] PDSCH: physical downlink shared channel

[0085] PMI: precoding matrix indicator

[0086] PUCCH: Physical uplink control channel

[0087] PUSCH: Physical uplink shared channel

[0088] RE: resource element

[0089] RI: Rank indicator

[0090] RRC: radio resource control

[0091] RSSI: received signal strength indicator

[0092] Rx: Reception

[0093] QCL: quasi co-location

[0094] SINR: signal to interference and noise ratio

[0095] SSB (or SS / PBCH block): synchronization signal block (including primary synchronization signal, secondary synchronization signal and physical broadcast channel)

[0096] TDM: time division multiplexing

[0097] TRP: transmission and reception point

[0098] TRS: tracking reference signal

[0099] Tx: transmission

[0100] UE: user equipment

[0101] ZP: zero power

[0102] As more and more communication devices demand greater communication capacity, the need for improved mobile broadband communication compared to existing radio access technologies is emerging. Furthermore, massive Machine Type Communications (MTC), which connects numerous devices and objects to provide various services anytime, anywhere, is also a key issue to be considered in next-generation communications. Furthermore, communication system design that considers reliability and latency-sensitive services / terminals is being discussed. Accordingly, the introduction of next-generation wireless access technologies such as enhanced mobile broadband communication (eMBB), massive MTC (MMTC), and Ultra-Reliable and Low Latency Communication (URLLC) is being discussed, and for convenience, these technologies are referred to as NR in this specification. NR is an expression representing an example of 5G radio access technology (RAT).

[0103] A new RAT system, including NR, uses OFDM transmission scheme or a similar transmission scheme. The new RAT system may follow OFDM parameters different from those of LTE. Alternatively, the new RAT system may follow the existing LTE / LTE-A numerology but have a larger system bandwidth (e.g., 100 MHz). Alternatively, a single cell may support multiple numerologies. For example, terminals operating under different numerologies may coexist within a single cell.

[0104] A numerology corresponds to a single subcarrier spacing in the frequency domain. Different numerologies can be defined by scaling the reference subcarrier spacing by an integer N.

[0105] The three key requirement areas for 5G include (1) Enhanced Mobile Broadband (eMBB), (2) Massive Machine Type Communication (mMTC), and (3) Ultra-reliable and Low Latency Communications (URLLC).

[0106] Some use cases may require optimization across multiple domains, while others may focus on just one Key Performance Indicator (KPI). 5G supports these diverse use cases in a flexible and reliable manner.

[0107] eMBB extends far beyond basic mobile internet access, encompassing rich interactive tasks, cloud computing, and augmented reality media and entertainment applications. Data is a key driver of 5G, and dedicated voice services may not be the first to emerge in the 5G era. In 5G, voice is expected to be handled as an application, simply using the data connection provided by the communication system. The primary drivers of increased traffic volume are the increasing size of content and the growing number of applications requiring high data rates. Streaming services (audio and video), interactive video, and mobile internet connectivity will become more prevalent as more devices connect to the internet. Many of these applications require always-on connectivity to push real-time information and notifications to users. Cloud storage and applications are rapidly growing on mobile communication platforms, applicable to both work and entertainment. Cloud storage is a particular use case driving the growth of uplink data rates. 5G is also used for remote work in the cloud, requiring significantly lower end-to-end latency to maintain a superior user experience when tactile interfaces are used. Entertainment, for example, cloud gaming and video streaming are other key factors driving the demand for mobile broadband. Entertainment is essential on smartphones and tablets, regardless of location, including in highly mobile environments such as trains, cars, and airplanes. Another use case is augmented reality and information retrieval for entertainment, where augmented reality requires extremely low latency and instantaneous data volumes.

[0108] Additionally, one of the most anticipated 5G use cases involves the ability to seamlessly connect embedded sensors across all sectors, such as mMTC. The number of potential IoT devices is projected to reach 20.4 billion by 2020. Industrial IoT is one area where 5G will play a key role, enabling smart cities, asset tracking, smart utilities, agriculture, and security infrastructure.

[0109] URLLC encompasses new services that will transform industries through ultra-reliable, low-latency links, such as remote control of critical infrastructure and self-driving vehicles. Reliability and latency are essential for smart grid control, industrial automation, robotics, and drone control and coordination.

[0110] Let's take a more specific look at several use cases.

[0111] 5G can complement fiber-to-the-home (FTTH) and cable-based broadband (or DOCSIS) by delivering streams rated at hundreds of megabits per second to gigabits per second. These high speeds are required to deliver TV at resolutions beyond 4K (6K, 8K, and beyond), as well as virtual and augmented reality. Virtual reality (VR) and augmented reality (AR) applications include near-immersive sports events. Certain applications may require specialized network configurations. For example, for VR games, game companies may need to integrate their core servers with the network operator's edge network servers to minimize latency.

[0112] Automotive is expected to be a significant new driver for 5G, with numerous use cases for in-vehicle mobile communications. Passenger entertainment, for example, demands simultaneous high-capacity and high-mobility mobile broadband. This is because future users will expect high-quality connectivity regardless of their location or speed. Another automotive application is an augmented reality dashboard, which overlays information on what the driver sees through the windshield, identifying objects in the dark and informing the driver about their distance and movement. In the future, wireless modules will enable communication between vehicles, the exchange of information between vehicles and supporting infrastructure, and between vehicles and other connected devices (e.g., devices accompanying pedestrians). Safety systems can guide drivers on alternative courses of action to ensure safer driving, reducing the risk of accidents. The next step will be remotely controlled or self-driving vehicles, which will require highly reliable and fast communication between different self-driving vehicles and between vehicles and infrastructure. In the future, self-driving cars will perform all driving tasks, leaving drivers to focus solely on traffic anomalies that the vehicles themselves cannot detect. The technological requirements for self-driving cars will require ultra-low latency and ultra-high-speed reliability, increasing traffic safety to levels unattainable by humans.

[0113] Smart cities and smart homes, often referred to as "smart societies," will be embedded with dense wireless sensor networks. A distributed network of intelligent sensors will identify conditions for cost- and energy-efficient maintenance of cities or homes. A similar setup can be implemented for each home. Temperature sensors, window and heating controllers, burglar alarms, and appliances will all be connected wirelessly. Many of these sensors typically have low data rates, low power, and low cost. However, for example, real-time HD video may be required for certain types of devices for surveillance purposes.

[0114] The consumption and distribution of energy, including heat and gas, are becoming increasingly decentralized, requiring automated control of distributed sensor networks. Smart grids interconnect these sensors using digital information and communication technologies to collect and act on information. This information can include the behavior of suppliers and consumers, enabling smart grids to improve efficiency, reliability, economic efficiency, sustainable production, and automated distribution of fuels like electricity. Smart grids can also be viewed as another low-latency sensor network.

[0115] The health sector has numerous applications that can benefit from mobile communications. Telecommunications systems can support telemedicine, which provides clinical care in remote locations. This can help reduce distance barriers and improve access to health services that are otherwise unavailable in remote rural areas. It can also be used to save lives in critical care and emergency situations. Mobile-based wireless sensor networks can provide remote monitoring and sensors for parameters such as heart rate and blood pressure.

[0116] Wireless and mobile communications are becoming increasingly important in industrial applications. Wiring is expensive to install and maintain. Therefore, the potential to replace cables with reconfigurable wireless links presents an attractive opportunity for many industries. However, achieving this requires wireless connections to operate with similar latency, reliability, and capacity to cables, while simplifying their management. Low latency and extremely low error rates are new requirements for 5G connectivity.

[0117] Logistics and freight tracking are important use cases for mobile communications, enabling the tracking of inventory and packages anywhere using location-based information systems. Logistics and freight tracking typically require low data rates but wide coverage and reliable location information.

[0118] Multi-Input Multi-Output (MIMO) technology in NR systems provides a scalable and flexible MIMO framework. Basically, it includes beam-based operation, scalable and flexible Channel State Information (CSI) codebook, reference signal (RS) design, and codebook design for CSI Type I and CSI Type II. Additionally, improvements have been introduced to support a CSI Type II codebook for multi-user (MU)-MIMO, multiple transmit / receive points (TRPs) or multiple panel transmission operations depending on backhaul conditions, multi-beam operation, high uplink transmit power support, and reference signals with low Peak-to-Average Power Ratio (PAPR) characteristics. Furthermore, beam management methods to reduce beam failure for wireless devices moving at high frequencies, expansion of multi-TRP transmission in uplink and downlink, sounding reference signals (SRSs) for capacity and coverage expansion, and improvements to Type II CSI-RSs can be supported.

[0119] Describes a conventional wireless communication system. This may also be called the Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN) or the Long Term Evolution (LTE) / LTE-A system.

[0120] E-UTRAN includes a base station (BS), which provides a control plane and a user plane to user equipment (UE). A UE may be fixed or mobile, and may be referred to by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, or a terminal. A base station (BS) is a fixed point that communicates with a UE, and may be referred to by other terms such as an evolved-NodeB (eNB), a gNodeB (gNB), a base transceiver system (BTS), or an access point.

[0121] Base stations can be interconnected via the X2 interface. Base stations are connected to the Evolved Packet Core (EPC) via the S1 interface, more specifically, to the Mobility Management Entity (MME) via the S1-MME, and to the Serving Gateway (S-GW) via the S1-U.

[0122] The EPC consists of an MME, an S-GW, and a P-GW (Packet Data Network Gateway). The MME holds information about terminal access and capabilities, and this information is primarily used for terminal mobility management. The S-GW is a gateway that terminates on the E-UTRAN, and the P-GW is a gateway that terminates on the PDN.

[0123] Figure 1 illustrates the system architecture of a New Generation Radio Access Network (NG-RAN) to which NR is applied.

[0124] Referring to Fig. 1, the NG-RAN may include gNBs and / or eNBs that provide user plane and control plane protocol termination to the UE. Fig. 1 exemplifies a case including only gNBs. The gNBs (eNBs) are connected to each other via Xn interfaces. The gNBs and eNBs are connected to the 5th generation core network (5G Core Network: 5GC) via the NG interface. More specifically, they are connected to the access and mobility management function (AMF) via the NG-C interface, and to the user plane function (UPF) via the NG-U interface.

[0125] The layers of the radio interface protocol between the terminal and the network can be divided into L1 (layer 1), L2 (layer 2), and L3 (layer 3) based on the three lower layers of the Open System Interconnection (OSI) standard model, which is widely known in communication systems. Among these, the physical layer belonging to layer 1 provides information transfer service using physical channels, and the RRC (Radio Resource Control) layer located in layer 3 controls radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the base station.

[0126] Figure 2 is a block diagram illustrating the radio protocol architecture for the user plane. Figure 3 is a block diagram illustrating the radio protocol architecture for the control plane. The user plane is a protocol stack for transmitting user data, and the control plane is a protocol stack for transmitting control signals.

[0127] Referring to Figures 2 and 3, the physical layer (PHY layer) provides information transfer services to upper layers using physical channels. The PHY layer is connected to its upper layer, the Medium Access Control (MAC) layer, through a transport channel. Data is transferred between the MAC layer and the PHY layer via the transport channel. Transport channels are classified based on how and with what characteristics data is transmitted over the wireless interface.

[0128] Data travels between different physical layers, i.e., between the physical layers of a transmitter and receiver, via a physical channel. This physical channel can be modulated using Orthogonal Frequency Division Multiplexing (OFDM) and utilizes time and frequency as radio resources.

[0129] The MAC layer's functions include mapping between logical channels and transport channels, and multiplexing / demultiplexing MAC service data units (SDUs) belonging to logical channels into transport blocks provided as physical channels on the transport channels. The MAC layer provides services to the RLC (Radio Link Control) layer through logical channels.

[0130] The functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs. To guarantee the various Quality of Service (QoS) required by radio bearers (RBs), the RLC layer provides three operating modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction through automatic repeat request (ARQ).

[0131] The RRC (Radio Resource Control) layer is defined only in the control plane. The RRC layer is responsible for controlling logical, transport, and physical channels, including the configuration, reconfiguration, and release of radio bearers. An RB is a logical path provided by Layer 1 (PHY layer) and Layer 2 (MAC layer, RLC layer, PDCP layer) for data transmission between a terminal and the network.

[0132] The functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include the transmission of user data, header compression, and ciphering. The functions of the Packet Data Convergence Protocol (PDCP) layer in the control plane include the transmission of control plane data and encryption / integrity protection.

[0133] Establishing an RB refers to the process of defining the characteristics of the radio protocol layer and channel to provide a specific service, and setting specific parameters and operating methods for each. RBs can be further divided into two types: signaling RBs (SRBs) and data RBs (DRBs). SRBs are used as a conduit for transmitting RRC messages in the control plane, while DRBs are used as conduits for transmitting user data in the user plane.

[0134] When an RRC connection is established between the RRC layer of the terminal and the RRC layer of the E-UTRAN, the terminal is in an RRC connected state, otherwise it is in an RRC idle state.

[0135] Downlink transmission channels that transmit data from the network to the terminal include the Broadcast Channel (BCH), which transmits system information, and the downlink Shared Channel (SCH), which transmits user traffic or control messages. Traffic or control messages for downlink multicast or broadcast services may be transmitted through the downlink SCH or a separate downlink Multicast Channel (MCH). Meanwhile, uplink transmission channels that transmit data from the terminal to the network include the Random Access Channel (RACH), which transmits initial control messages, and the uplink Shared Channel (SCH), which transmits user traffic or control messages.

[0136] Logical channels that are located above the transport channel and are mapped to the transport channel include BCCH (Broadcast Control Channel), PCCH (Paging Control Channel), CCCH (Common Control Channel), MCCH (Multicast Control Channel), and MTCH (Multicast Traffic Channel).

[0137] A physical channel consists of multiple OFDM symbols in the time domain and multiple subcarriers in the frequency domain. A single subframe consists of multiple OFDM symbols in the time domain. A resource block is a resource allocation unit and consists of multiple OFDM symbols and multiple subcarriers. Additionally, each subframe can use specific subcarriers of specific OFDM symbols (e.g., the first OFDM symbol) of the subframe for the Physical Downlink Control Channel (PDCCH), for example, the L1 / L2 control channel. A Transmission Time Interval (TTI) is a unit time for subframe transmission.

[0138] Figure 4 illustrates the functional division between NG-RAN and 5GC.

[0139] Referring to FIG. 4, the gNB can provide functions such as inter-cell radio resource management (Inter Cell RRM), radio bearer management (RB control), connection mobility control (Connection Mobility Control), radio admission control (Radio Admission Control), measurement configuration and provision, and dynamic resource allocation. The AMF can provide functions such as NAS security and idle state mobility processing. The UPF can provide functions such as mobility anchoring and PDU processing. The SMF (Session Management Function) can provide functions such as terminal IP address allocation and PDU session control.

[0140] Figure 5 illustrates a frame structure that can be applied in NR.

[0141] Referring to FIG. 5, a radio frame (hereinafter abbreviated as a frame) can be used for uplink and downlink transmission in NR. A frame has a length of 10 ms and can be defined as two 5 ms half-frames (Half-Frames, HF). A half-frame can be defined as five 1 ms sub-frames (Subframes, SF). A frame can include 10 sub-frames. A sub-frame can be divided into one or more slots, and the number of slots in a sub-frame depends on the Subcarrier Spacing (SCS). Each slot includes 12 or 14 OFDM (A) symbols depending on the cyclic prefix (CP). When a normal CP is used, each slot includes 14 symbols. When an extended CP is used, each slot includes 12 symbols. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol), an SC-FDMA symbol (or a DFT-s-OFDM symbol). A mini-slot may include, for example, 2, 4, or 7 symbols, or may include more or fewer symbols.

[0142] NR systems can support multiple numerologies. Numerologies can be defined by subcarrier spacing and cyclic prefix (CP) overhead. Multiple subcarrier spacings can be derived by scaling the basic subcarrier spacing by an integer N. Furthermore, even if it is assumed that very low subcarrier spacing is not utilized at very high carrier frequencies, the numerologies utilized can be selected independently of the frequency band. Furthermore, NR systems can support various frame structures corresponding to multiple numerologies.

[0143] Below, we examine the Orthogonal Frequency Division Multiplexing (OFDM) numerologies and frame structures that can be considered in NR systems. Table 1 lists the various OFDM numerologies supported in NR systems.

[0144] Table 1 below illustrates the subcarrier spacing configuration μ (also referred to as subcarrier spacing configuration).

[0145] [Table 1]

[0146]

[0147] Regarding the frame structure in the NR system, the sizes of the various fields in the time domain are T s =1 / (Δf max ·N f ) can be expressed as a multiple of the time unit. Here, Δf max =480·10 3 and N f =409. Downlink and uplink transmissions are T f =(Δf max ·N f / 100)·T s = It consists of a radio frame with a duration of 10ms. Here, each radio frame is T sf =(Δf max ·N f / 1000)·T s = It consists of 10 subframes with a duration of 1ms. In this case, there may be one set of frames for uplink and one set of frames for downlink. In addition, the transmission of uplink frame number i from a terminal (User Equipment, UE) is T earlier than the start of the corresponding downlink frame from the terminal. TA =N TA ·T sIt must start before. For numerology μ, slots are n within a subframe. μ s ∈{0, ..., N slots,μ subframe -1} are numbered in increasing order, and n within a radio frame μ s,f ∈{0, ..., N slots,μ frame -1} are numbered in increasing order. One slot is N μ symb It consists of consecutive OFDM symbols, and N μ symb is determined by the numerology and slot configuration used. Slot n in a subframe μ s The start of OFDM symbol n in the same subframe μ s N μ symb are aligned temporally with the start of the OFDM signal. Not all terminals can transmit and receive simultaneously, which means that not all OFDM symbols in a downlink slot or uplink slot can be utilized.

[0148] Table 2 below shows the number of slots (N) in a frame according to the subcarrier spacing setting μ. frame,μ slot ), number of slots in a subframe (N subframe,μ slot ), number of symbols in the slot (N slot symb ) are examples.

[0149] [Table 2]

[0150]

[0151] Table 3 below illustrates that when extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe change depending on the SCS.

[0152] [Table 3]

[0153]

[0154] In an NR system, OFDM(A) numerologies (e.g., SCS, CP length, etc.) may be set differently between multiple cells that are merged into a single terminal. Accordingly, the (absolute time) interval of a time resource (e.g., SF, slot, or TTI) (conveniently referred to as TU (Time Unit)) consisting of the same number of symbols may be set differently between the merged cells.

[0155] In relation to physical resources in an NR system, antenna ports, resource grids, resource elements, resource blocks, and carrier parts can be considered. Hereinafter, the physical resources that can be considered in an NR system will be described in detail. First, with respect to antenna ports, an antenna port is defined such that the channel through which a symbol on the antenna port is carried can be inferred from the channel through which another symbol on the same antenna port is carried. If the large-scale properties of the channel through which a symbol on one antenna port is carried can be inferred from the channel through which a symbol on another antenna port is carried, then the two antenna ports can be said to be in a QC / QCL (quasi co-located or quasi co-location) relationship. Here, the large-scale properties include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

[0156] Figure 6 shows an example of a resource grid in NR.

[0157] Referring to Figure 6, the resource grid is N in the frequency domain. μ RB N RB sc It consists of subcarriers, and one subframe is 14·2 μ It is described as an example, but not limited to, that it consists of OFDM symbols. In an NR system, the transmitted signal is N μ RB N RB sc One or more resource grids consisting of subcarriers and 2 μ N (μ) symb is described by OFDM symbols. Here, N μ RB ≤N max,μ RB is. The above N max,μ RB represents the maximum transmission bandwidth, which may vary between numerologies as well as between uplink and downlink. In this case, one resource grid may be configured for each numerology μ and each antenna port p. Each element of the resource grid for numerology μ and each antenna port p is referred to as a resource element and is uniquely identified by an index pair {index in the frequency domain, position of the symbol within the subframe}. If there is no risk of confusion or if a particular antenna port or numerology is not specified, the indices p and μ may be dropped. In addition, a resource block (RB) is defined as N in the frequency domain. RB sc = is defined as 12 consecutive subcarriers.

[0158] Point A serves as a common reference point of the resource block grid and is obtained as follows.

[0159] offsetToPointA for primary cell (Pcell) downlink represents the frequency offset between the lowest subcarrier of the lowest resource block overlapping the SS / PBCH block used by the terminal for initial cell selection and point A, expressed in resource block units assuming 15 kHz subcarrier spacing for FR1 and 60 kHz subcarrier spacing for FR2, and absoluteFrequencyPointA represents the frequency-location of point A expressed as in absolute radio-frequency channel number (ARFCN).

[0160] Common resource blocks (CRBs) are numbered from 0 upwards in the frequency domain for a subcarrier spacing setting μ. The center of subcarrier 0 of CRB 0 for a subcarrier spacing setting μ coincides with 'point A'. CRB number n in the frequency domain μ CRB The resource elements (k,l) for the subcarrier spacing setting μ are given by the following equation.

[0161] [Formula 1]

[0162]

[0163] k is defined relative to point A so that k=0 corresponds to the subcarrier centered at point A. Physical resource blocks are numbered from 0 to N within the bandwidth part (BWP). size BWP,i - Numbered from 1 to 1, where i is the number of BWP. Physical resource block n in BWP i PRB and common resource block n CRBThe relationship between them is given by the equation below.

[0164] [Formula 2]

[0165]

[0166] N start BWP,i is a common resource block where BWP starts relative to common resource block 0.

[0167] Figure 7 shows an example of a physical resource block in NR.

[0168] Referring to FIG. 7, a physical resource block (PRB) may be composed of different frequency resources and time resources depending on the subcarrier spacing.

[0169] Figure 8 illustrates the slot structure of an NR frame.

[0170] Referring to FIG. 8, a slot may include multiple symbols in the time domain. For example, in the case of a normal CP, one slot may include 14 symbols, but in the case of an extended CP, one slot may include 12 symbols. A carrier may include multiple subcarriers in the frequency domain. A Resource Block (RB) may be defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A Bandwidth Part (BWP) may be defined as multiple consecutive (P)RBs in the frequency domain, and may correspond to one numerology (e.g., SCS, CP length, etc.). A carrier may include up to N BWPs (e.g., 4 or 5). Data communication is performed through activated BWPs, and only one BWP may be activated for one terminal. In the resource grid, each element is referred to as a Resource Element (RE), to which one complex symbol can be mapped.

[0171] As another example, in the time domain, a slot for a normal CP contains 7 symbols, but in the case of an extended CP, a slot contains 6 symbols. A carrier contains multiple subcarriers in the frequency domain. A Resource Block (RB) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A Bandwidth Part (BWP) is defined as multiple consecutive (P)RBs in the frequency domain, and can correspond to a single numerology (e.g., SCS, CP length, etc.). A carrier can contain up to N (e.g., 5) BWPs. Data communication is performed through activated BWPs, and only one BWP can be activated for a single terminal. Each element in the resource grid is referred to as a Resource Element (RE), to which one complex symbol can be mapped.

[0172] A PDCCH (physical downlink control channel) may be composed of one or more CCEs (control channel elements) as shown in Table 4 below.

[0173] [Table 4]

[0174]

[0175] For example, a PDCCH can be transmitted via a resource consisting of 1, 2, 4, 8, or 16 CCEs, where a CCE is composed of 6 resource element groups (REGs), and one REG is composed of one resource block in the frequency domain and one orthogonal frequency division multiplexing (OFDM) symbol in the time domain.

[0176] Monitoring refers to decoding each PDCCH candidate according to the DCI (downlink control information) format. The terminal monitors a set of PDCCH candidates in one or more core sets (CORESETs, described below) on the active DL BWP of each activated serving cell for which PDCCH monitoring is configured, according to the corresponding search space set.

[0177] In NR, a new unit called a control resource set (CORESET) can be introduced. A terminal can receive PDCCHs in a CORESET.

[0178] Figure 9 illustrates a core set.

[0179] Referring to Figure 9, the core set is N in the frequency domain. CORESET RB It consists of N resource blocks and is in the time domain. CORESET symb ∈ {1, 2, 3} symbols. N CORESET RB , N CORESET symb can be provided by the base station via upper layer signals. As illustrated in Fig. 9, a core set may include multiple CCEs (or REGs).

[0180] A terminal may attempt PDCCH detection in units of 1, 2, 4, 8, or 16 CCEs within a core set. One or more CCEs for which PDCCH detection can be attempted may be referred to as PDCCH candidates.

[0181] A terminal can be configured with multiple core sets.

[0182] In conventional wireless communication systems (e.g., LTE / LTE-A), the control domain spans the entire system bandwidth used by the base station. Except for some terminals that support only narrow bandwidths (e.g., eMTC / NB-IoT terminals), all terminals must be able to receive radio signals across the entire system bandwidth of the base station to properly receive / decode the control information transmitted by the base station.

[0183] In contrast, NR introduces the aforementioned core set. A core set is a radio resource for control information that a terminal must receive. It can utilize only a portion of the system bandwidth in the frequency domain, rather than the entire bandwidth. Furthermore, it can utilize only a portion of the symbols within a slot in the time domain. The base station can assign a core set to each terminal and transmit control information through the assigned core set. In NR, a terminal can receive control information from the base station without necessarily receiving the entire system bandwidth.

[0184] The core set may include a terminal-specific core set for transmitting terminal-specific control information and a common core set for transmitting control information common to all terminals.

[0185] Meanwhile, in NR, depending on the application field, high reliability may be required, and in such a situation, the target block error rate (BLER) for downlink control information (DCI) transmitted through a downlink control channel (e.g., physical downlink control channel: PDCCH) may be significantly lower than in the prior art. One example of a method for satisfying such a requirement requiring high reliability is to reduce the amount of content included in the DCI and / or increase the amount of resources used when transmitting the DCI. In this case, the resources may include at least one of time domain resources, frequency domain resources, code domain resources, and spatial domain resources.

[0186] The following technologies / features can be applied in NR:

[0187] Self-contained subframe structure

[0188] Figure 10 illustrates an example of a slot structure for a new wireless access technology.

[0189] In NR, a structure in which a control channel and a data channel are time-division multiplexed (TDM) within one TTI, as shown in Fig. 10, can be considered for the purpose of minimizing latency.

[0190] FIG. 10 illustrates an example in which a downlink control region is located at the front of the TTI and an uplink control region is located at the back of the TTI. The region between the downlink control region and the uplink control region can be used for downlink data (DL data) transmission or uplink data (UL data) transmission. A characteristic of this structure is that downlink (DL) reception and uplink (UL) transmission are sequentially performed within a single subframe / slot, so that DL data can be received and UL ACK / NACK (Acknowledgement / Not-acknowledgement) can be transmitted within a single subframe / slot. As a result, the time required for data retransmission when a data transmission error occurs is reduced, thereby minimizing the latency of the final data transmission.

[0191] In this way, in a structure where data and control domains are TDMed, a time gap is required for the base station and terminal to transition from transmission mode to reception mode, or from reception mode to transmission mode. To this end, some OFDM symbols at the transition point from DL to UL in a self-contained subframe structure can be designated as a guard period (GP).

[0192] Figure 11 illustrates the structure of a self-contained slot.

[0193] In an NR system, a single slot may contain a DL control channel, DL or UL data, and a UL control channel. For example, the first N symbols in a slot may be used to transmit a DL control channel (hereinafter, referred to as a DL control region), and the last M symbols in the slot may be used to transmit a UL control channel (hereinafter, referred to as a UL control region). N and M are each integers greater than or equal to 0. A resource region (hereinafter, referred to as a data region) between the DL control region and the UL control region may be used for DL ​​data transmission or UL data transmission. As an example, the following configuration may be considered. Each section is listed in chronological order.

[0194] 1. DL only configuration

[0195] 2. UL only configuration

[0196] 3. Mixed UL-DL configuration

[0197] - DL area + GP (Guard Period) + UL control area

[0198] - DL control area + GP + UL area

[0199] DL area: (i) DL data area, (ii) DL control area + DL data area

[0200] UL domain: (i) UL data domain, (ii) UL data domain + UL control domain

[0201] In the DL control region, a PDCCH can be transmitted, and in the DL data region, a PDSCH (physical downlink shared channel) can be transmitted. In the UL control region, a PUCCH (physical uplink control channel) can be transmitted, and in the UL data region, a PUSCH (physical uplink shared channel) can be transmitted. In the PDCCH, downlink control information (DCI), such as DL data scheduling information and UL data scheduling information, can be transmitted. In the PUCCH, uplink control information (UCI), such as ACK / NACK (Positive Acknowledgement / Negative Acknowledgement) information for DL ​​data, CSI (Channel State Information) information, and SR (Scheduling Request), can be transmitted. GP provides a time gap when a base station and a terminal switch from transmission mode to reception mode or from reception mode to transmission mode. Some symbols at the time of switching from DL to UL within a subframe can be set as GP.

[0202] System information of an NR system can be transmitted in a broadcasting manner. At this time, analog beams belonging to different antenna panels within one symbol can be transmitted simultaneously, and a method of introducing a beam reference signal (BRS), which is a reference signal (RS) transmitted by applying a single analog beam (corresponding to a specific antenna panel) to measure a channel for each analog beam, is being discussed. The BRS can be defined for multiple antenna ports, and each antenna port of the BRS can correspond to a single analog beam. At this time, unlike the BRS, a synchronization signal or xPBCH can be transmitted by applying all analog beams within an analog beam group so that any terminal can receive it well.

[0203] In NR, a synchronization signal block (SSB, or may be referred to as a synchronization signal and physical broadcast channel (SS / PBCH) in the time domain) may be composed of four OFDM symbols numbered in ascending order from 0 to 3 within the synchronization signal block, and a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH associated with a demodulation reference signal (DMRS) may be mapped to the symbols. As described above, the synchronization signal block may also be referred to as an SS / PBCH block.

[0204] In NR, multiple synchronization signal blocks can be transmitted at different times, and SSB can be used to perform initial access (IA), serving cell measurement, etc. Therefore, when the transmission time and resources overlap with other signals, it is desirable to transmit SSB preferentially. To achieve this, the network can broadcast SSB transmission time and resource information or indicate it through UE-specific RRC signaling.

[0205] NR can perform beam-based transmission and reception operations. If the reception performance of the current serving beam degrades, a process called beam failure recovery (BFR) can be used to find a new beam.

[0206] Since BFR is not a process for declaring an error / failure in the link between the network and the terminal, it can be assumed that the connection with the current serving cell is maintained even when the BFR process is performed. During the BFR process, measurements are performed on different beams set by the network (a beam can be expressed as a CSI-RS port or an SSB (synchronization signal block) index, etc.) and the best beam for the terminal is selected. The terminal can proceed with the BFR process by performing the RACH process associated with the beam with the best measurement result.

[0207] Now, we will describe the Transmission Configuration Indicator (TCI) state. The TCI state can be set for each core set of the control channel, and parameters for determining the terminal's receive (Rx) beam can be determined based on the TCI state.

[0208] For each downlink bandwidth portion (DL BWP) of a serving cell, a terminal may be configured with up to three core sets. Additionally, for each core set, the terminal may be provided with the following information:

[0209] 1) Coreset index p (e.g., one from 0 to 11, where the index of each coreset can be uniquely determined among the BWPs of a serving cell),

[0210] 2) PDCCH DM-RS scrambling sequence initialization value,

[0211] 3) Interval in the time domain of the core set (can be given in symbol units),

[0212] 4) A set of resource blocks,

[0213] 5) CCE-to-REG mapping parameters,

[0214] 6) Antenna port quasi co-location (QCL) information indicating quasi co-location (QCL) information of DM-RS antenna ports for PDCCH reception in each core set (from a set of antenna port quasi co-locations provided by a higher layer parameter called 'TCI-State');

[0215] 7) Indicating the presence or absence of a transmission configuration indication (TCI) field for a specific DCI format transmitted by PDCCH in the core set, etc.

[0216] Let's explain QCL. If the characteristics of the channel through which a symbol on one antenna port is transmitted can be inferred from the characteristics of the channel through which a symbol on another antenna port is transmitted, then the two antenna ports are said to be in quasi-co-location (QCL). For example, if two signals (A and B) are transmitted from the same transmit antenna array with identical / similar spatial filters applied, the two signals may experience identical / similar channel conditions. From the receiver's perspective, if one of the two signals is received, the channel characteristics of the received signal can be used to detect the other signal.

[0217] In this sense, the fact that A and B are QCL may mean that A and B experienced similar channel conditions, and thus, the channel information estimated to detect A is also useful for detecting B. Here, the channel conditions may be defined by, for example, Doppler shift, Doppler spread, average delay, delay spread, spatial reception parameters, etc.

[0218] The 'TCI-State' parameter associates one or two downlink reference signals with a corresponding QCL type (there are QCL types A, B, C, and D, see Table 5).

[0219] [Table 5]

[0220]

[0221] Each 'TCI-State' may include parameters for establishing a quasi-colocation (QCL) relationship between one or two downlink reference signals and a DM-RS port of a PDSCH (or PDCCH), or a CSI-RS port of a CSI-RS resource.

[0222] Meanwhile, in each DL BWP configured for a terminal in a serving cell, the terminal may be provided with up to 10 search space sets. For each search space set, the terminal may be provided with at least one of the following pieces of information.

[0223] 1) Search space set index s (0≤s<40), 2) Association between core set P and search space set s, 3) PDCCH monitoring period and PDCCH monitoring offset (slot unit), 4) PDCCH monitoring pattern within a slot (e.g., indicating the first symbol of the core set within a slot for PDCCH monitoring), 5) Number of slots in which search space set s exists, 6) Number of PDCCH candidates per CCE aggregation level, 7) Information indicating whether search space set s is CSS (common search space) or USS (UE-specific search space), etc.

[0224] In NR, core set #0 can be configured by PBCH (or terminal-specific signaling for handover, PSCell configuration, or BWP configuration). The search space (SS) set #0 configured by PBCH can have different monitoring offsets (e.g., slot offset, symbol offset) for each associated SSB. This may be necessary to minimize the search space occasions that the terminal must monitor. Alternatively, it may also be necessary to provide a beam sweeping control / data area that can transmit control / data for each beam so that communication with the terminal can be continuously performed in a situation where the best beam of the terminal dynamically changes.

[0225] Figure 12 illustrates physical channels and typical signal transmission.

[0226] Referring to Figure 12, in a wireless communication system, a terminal receives information from a base station via the downlink (DL), and the terminal transmits information to the base station via the uplink (UL). The information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels exist depending on the type and purpose of the information they transmit and receive.

[0227] When a terminal is powered on again from a powered-off state or newly enters a cell, it performs an initial cell search operation, such as synchronizing with the base station (S11). To this end, the terminal receives the PSCH (Primary Synchronization Channel) and SSCH (Secondary Synchronization Channel) from the base station to synchronize with the base station and obtain information such as the cell ID (cell identity). In addition, the terminal can obtain broadcast information within the cell by receiving the PBCH (Physical Broadcast Channel) from the base station. In addition, the terminal can receive the DL RS (Downlink Reference Signal) during the initial cell search phase to check the downlink channel status.

[0228] (Initial) cell search can be defined as a procedure in which a terminal acquires time and frequency synchronization with a cell and detects the cell ID of the cell. Cell search can be based on the primary synchronization signal and secondary synchronization signal of the cell, and the PBCH DMRS.

[0229] A terminal that has completed initial cell search can obtain more specific system information by receiving a PDCCH (Physical Downlink Control Channel) and a corresponding PDSCH (Physical Downlink Control Channel) (S12).

[0230] Thereafter, the terminal can perform a random access procedure (Random Access Procedure) to complete connection to the base station (S13-S16). Specifically, the terminal can transmit a preamble through a Physical Random Access Channel (PRACH) (S13) and receive a Random Access Response (RAR) for the preamble through a PDCCH and a corresponding PDSCH (S14). Thereafter, the terminal can transmit a Physical Uplink Shared Channel (PUSCH) using scheduling information in the RAR (S15) and perform a contention resolution procedure (Contention Resolution Procedure) such as a PDCCH and a corresponding PDSCH (which can be considered a process of receiving a contention resolution message) (S16).

[0231] When accessing a base station for the first time or when there is no radio resource for signal transmission, a terminal may perform a random access procedure (RACH) for the base station. At this time, a 4-step contention-based or type-1 random access may include a first step in which the terminal transmits a random access preamble (or Msg1) to the base station, a second step in which the terminal receives a random access response (RAR) (or Msg2) from the base station, a third step in which the terminal transmits an uplink message (or Msg3) to the base station, and a fourth step in which the terminal receives a contention resolution message (or Msg4) from the base station. Alternatively, a 2-step contention-based or type-2 random access may include a step A in which the terminal transmits a random access preamble and an uplink message to the base station, and a step B in which the terminal receives a random access response and a contention resolution message from the base station. A contention-free random access procedure may only include steps 1 and 2 of a contention-based access procedure, and steps 3 and 4 are not required because no contention occurs between terminals.

[0232] The terminal can transmit a random access preamble or PRACH to the base station based on the random access opportunity (RO), preamble transmission power, etc. provided through SIB1 or dedicated RRC signaling. Here, the terminal can select an optimal SSB or CSI-RS (Channel Status Information-Reference Signal) and determine an RO and / or preamble index group associated with the selected SSB or CSI-RS. The terminal can select an optimal SSB and a corresponding reception beam from among a plurality of SSBs corresponding to the multi-beam sweeping of the base station during the initial access process. Meanwhile, after the initial access, the terminal can perform transmission beam and / or reception beam selection or change through a CSI measurement and reporting process based on the CSI-RS from the base station in an RRC connection state.

[0233] After the terminal transmits the preamble, the terminal can monitor RAR reception for a predetermined period of time. For example, the terminal can monitor the PDCCH scrambled with RA-RNTI and receive the RAR through the PDSCH transmitted in the resource scheduled by the DCI in the PDCCH. The RAR may include a Random Access Preamble Identifier (RAPID), an uplink grant (UL Grant) for Msg3 scheduling, a temporary cell identifier (Temporary C(Cell)-RNTI), and a Timing Advance Command (TAC) determined based on the preamble reception timing.

[0234] If the terminal fails to successfully receive the RAR, the preamble can be retransmitted by applying power ramping, etc.

[0235] If the terminal successfully receives the RAR, it can transmit Msg3 based on the UL grant within the RAR. Once Msg3 is transmitted, the terminal can start the contention resolution timer (CR timer) and perform PDCCH monitoring based on the C-RNTI for Msg4 reception. If Msg4 is received while the CR timer is running, the terminal can determine that contention resolution has been successfully completed.

[0236] A terminal that has performed the above-described procedure can then perform PDCCH / PDSCH reception (S17) and PUSCH / PUCCH (Physical Uplink Control Channel) transmission (S18) as general uplink / downlink signal transmission procedures. Control information that the terminal transmits to the base station is referred to as UCI (Uplink Control Information). UCI includes HARQ ACK / NACK (Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK), SR (Scheduling Request), CSI (Channel State Information), etc. CSI includes CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indication), etc. UCI is generally transmitted through PUCCH, but can be transmitted through PUSCH when control information and data must be transmitted simultaneously. In addition, the terminal can aperiodically transmit UCI through PUSCH according to a request / instruction of the network. UCI can be repeatedly transmitted over PUCCH.

[0237] Meanwhile, the control information that the terminal transmits to the base station via the uplink (or that the terminal receives from the base station) may include downlink / uplink ACK / NACK signals, CQI (Channel Quality Indicator), PMI (Precoding Matrix Index), RI (Rank Indicator), etc. For example, in the case of a 3GPP LTE system, the terminal may transmit the above-described control information such as CQI / PMI / RI via PUSCH and / or PUCCH.

[0238] The table below shows an example of the DCI format.

[0239] [Table 6]

[0240]

[0241] Referring to Table 6 above, DCI formats 0_0, 0_1, and 0_2 may include resource information related to scheduling of PUSCH (e.g., UL / SUL (Supplementary UL), frequency resource allocation, time resource allocation, frequency hopping, etc.), transport block (TB) related information (e.g., MCS, NDI, RV, etc.), HARQ related information (e.g., process number, DAI, PDSCH-HARQ feedback timing, etc.), multi-antenna related information (e.g., DMRS sequence initialization information, antenna port, CSI request, etc.), power control information (e.g., PUSCH power control, etc.), and the control information included in each DCI format may be predefined.

[0242] DCI format 0_0 is used for scheduling PUSCH in a single cell. The information contained in DCI format 0_0 is CRC-scrambled and transmitted using C-RNTI, CS-RNTI, or MCS-C-RNTI.

[0243] DCI format 0_1 ​​is used to schedule one or more PUSCHs in a single cell, or to indicate configured grant (CG) downlink feedback information to the UE. The information contained in DCI format 0_1 ​​is CRC-scrambled and transmitted using the C-RNTI, CS-RNTI, SP-CSI-RNTI, or MCS-C-RNTI.

[0244] DCI format 0_2 is used for scheduling PUSCH in a single cell. The information contained in DCI format 0_2 is CRC-scrambled and transmitted using C-RNTI, CS-RNTI, SP-CSI-RNTI, or MCS-C-RNTI.

[0245] Next, DCI formats 1_0, 1_1, and 1_2 may include resource information related to scheduling of PDSCH (e.g., frequency resource allocation, time resource allocation, VRB-PRB mapping, etc.), transport block (TB) related information (e.g., MCS, NDI, RV, etc.), HARQ related information (e.g., process number, DAI, PDSCH-HARQ feedback timing, etc.), multi-antenna related information (e.g., antenna port, TCI, SRS request, etc.), PUCCH related information (e.g., PUCCH power control, PUCCH resource indicator, etc.), and control information included in each DCI format may be predefined.

[0246] DCI format 1_0 is used for scheduling PDSCH in a DL cell. The information contained in DCI format 1_0 is CRC-scrambled and transmitted using C-RNTI, CS-RNTI, or MCS-C-RNTI.

[0247] DCI format 1_1 is used for scheduling PDSCH in a single cell. Information included in DCI format 1_1 is CRC-scrambled and transmitted using C-RNTI, CS-RNTI, or MCS-C-RNTI.

[0248] DCI format 1_2 is used for scheduling PDSCH in a single cell. The information contained in DCI format 1_2 is CRC-scrambled and transmitted using C-RNTI, CS-RNTI, or MCS-C-RNTI.

[0249] DCI format 1_3 is used for scheduling one PDSCH in one cell or multiple PDSCHs in multiple cells.

[0250] Meanwhile, the 5G mobile communications system, a successor to LTE (long-term evolution), is a new clean-slate mobile communications system characterized by high performance, low latency, and high availability. 5G NR can utilize all available spectrum resources, from low-frequency bands below 1 GHz, to intermediate-frequency bands between 1 GHz and 10 GHz, and high-frequency (millimeter wave) bands above 24 GHz. Based on these foundational technologies for 5G mobile communications, 6G mobile communications systems are being developed.

[0251] The 6G (wireless) system aims to provide (i) very high data rates per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) low energy consumption for battery-free Internet of Things (IoT) devices, (vi) ultra-reliable connectivity, and (vii) connected intelligence with machine learning capabilities. The vision of the 6G system can be divided into four aspects: intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity.

[0252] A 6G system can satisfy the requirements shown in Table 7 below. Table 7 may represent an example of the requirements of a 6G system.

[0253] [Table 7]

[0254]

[0255] 6G Network Structure

[0256] Figure 13 illustrates an example of a flexible network topology to which embodiments of the present specification may be applied.

[0257] Referring to Figure 13, a network topology in which a split radio access network (RAN) is configured more flexibly and resiliently can be considered to compensate for incomplete areas of network coverage.

[0258] For this purpose, various nodes such as IAB nodes, relays, and RF repeaters as in the example of Fig. 13 may be applied, and NTN (non-terrestrial network) may be integrated.

[0259] For example, an IAB node may correspond to a node providing wireless backhaul. For example, a relay may refer to any intermediate point, or in the case of a sidelink relay where a terminal functions as a relay, it may collectively refer to a terminal-to-network (U2N) relay and a terminal-to-terminal (U2U) relay.

[0260] For example, an RF repeater may be a node that simply performs the function of signal amplification and forwarding, or, in the case of a network-controlled repeater (NCR), it may not only amplify and forward signals, but also adjust its transmit and receive settings based on information provided by the network.

[0261] For example, NTN nodes could be satellites or aircraft that provide NTN coverage that terrestrial networks struggle to provide. Beyond these examples, various intermediate points can be introduced to improve the network topology.

[0262] In Figure 13, a split RAN can support partitioning a base station into a centralized unit (CU) and one or more distributed units (DUs). The CU and DU can correspond to logical units. The CU can be further partitioned into a control plane (CP) portion and one or more user plane (UP) portions. Since a failure in the CU-CP affects not only the CU-UP but also the DUs, various intermediate points can be introduced to compensate for this.

[0263] An intermediate point may correspond to a terminal or a base station, depending on its relationship to other nodes. For example, an IAB node may include a mobile-termination (MT) portion and a unit (DU). The MT may connect the IAB node to a donor node. The unit (DU) of an IAB node may serve other terminals or connect to other IAB nodes to provide multi-hop wireless backhaul to the terminal. In other words, an IAB node may correspond to a base station in its relationship to a user-side node, and to a terminal in its relationship to a network-side node.

[0264] Hereinafter, in some examples, the description of a terminal can be equally applied not only to a user-side end point, but also to an intermediate point corresponding to a terminal in a relative relationship with a network-side end point. Similarly, in some examples of this specification, the description of a base station can be equally applied not only to a network-side end point, but also to an intermediate point corresponding to a base station in a relative relationship with a user-side end point. However, in most cases where there is no additional description of the operations of three or more entities, the communication entities in this specification can be briefly described as terminals and / or base stations (or first nodes and / or second nodes). Here, the terms terminal and / or base stations (or first nodes and / or second nodes) can be interpreted to include / replace any end point or any intermediate point depending on the relationship with other nodes.

[0265] In some examples of the present specification below, for the sake of simplicity, the subjects of the operations may be referred to as base stations and / or terminals (or first nodes and / or second nodes). In addition, the terms base stations and / or terminals (or first nodes and / or second nodes) may also be interpreted / replaced as in the following examples: For example, the base stations (or first nodes) and terminals (or second nodes) may respectively correspond to the first endpoint and the second endpoint; may respectively correspond to the endpoint and the intermediate point; may respectively correspond to the intermediate point and the endpoint; or may respectively correspond to the first intermediate point and the second intermediate point.

[0266] In this specification, there may be zero or more intermediate points between the base station and the terminal. If intermediate points exist, they may be IAB nodes, relays, RF repeaters, NTN (non-terrestrial network) nodes, or nodes supporting other functions. An intermediate point may be a node with a fixed location or a node with an unfixed location.

[0267] <NR을 위한 풀 듀플렉스 동작(Full duplex operation for NR)>

[0268] 5G is giving rise to new service types, such as extended reality (XR), AI-based services, and self-driving vehicles. These services feature dynamic traffic changes in both downlink and uplink directions and require low latency for packet transmission. To support these diverse and novel use cases, 5G services will experience an explosive increase in traffic load.

[0269] In contrast, existing semi-static or dynamic TDD UL / DL configurations suffer from transmission delays and interference between operators. Existing FDD schemes also face limitations in efficient frequency resource utilization in the DL / UL directions. Therefore, the introduction of full-duplex operation within a single carrier is being discussed to achieve low latency and efficient resource utilization in NR.

[0270] Figure 14 illustrates a method of applying full duplex within a carrier.

[0271] Referring to Fig. 14, subband-wise full duplex (SB-FD) and spectrum-sharing full duplex (SS-FD) can be considered. Referring to Fig. 14 (a), in the case of SB-FD, transmission and reception of DL and UL are performed using different frequency resources on the same carrier. That is, DL and UL have different frequency resources for the same time resource. Referring to Fig. 14 (b), in the case of SS-FD, transmission and reception of DL and UL are performed using the same frequency resource or overlapping frequency resources on the same carrier. That is, DL and UL can have the same or overlapping frequency resources for the same time resource.

[0272] This full-duplex operation can be combined with existing half-duplex operation. In existing half-duplex-based TDD operation, only some time resources can be used for full-duplex operation. Time resources used for full-duplex operation can be used for SB-FD or SS-FD operations.

[0273] Figure 15 shows an example in which time resources operating in HD (half duplex) and time resources operating in FD (full duplex), such as SB-FD or SS-FD, coexist.

[0274] Referring to (a) of Fig. 15, some time resources operate as SB-FD and the remaining time resources operate as HD, and referring to (b) of Fig. 15, some time resources operate as SS-FD and the remaining time resources operate as HD. At this time, the unit of the time resource may be, for example, a slot or a symbol.

[0275] In a time resource operating as SB-FD, some frequency resources are used as DL resources, and some frequency resources are used as UL resources. Between the DL and UL frequency resources, there may be a guard band (or guard frequency resource or guard subcarrier(s)) that is not used by either DL or UL and is empty.

[0276] In a time resource operating as SF-FD, the entire frequency resource can be used for both DL and UL. Alternatively, to reduce the impact of interference from other adjacent carriers (e.g., adjacent carrier interference (ACI)), some frequency resources at one or both ends of a carrier may not be used for DL ​​and / or UL. That is, one or both ends of a carrier may be used as guard bands that are not used for both DL and UL. Alternatively, to reduce the impact of ACI on UL reception, one or both ends of a carrier may be used only for DL ​​transmission.

[0277] In this disclosure, a slot resource operating in HD is referred to as an HD slot, and a slot resource operating in SB-FD and a slot resource operating in SS-FD are referred to as an SB-FD slot and an SS-FD slot, respectively. In addition, an SS-FD slot and an SS-FD slot are collectively referred to as an FD slot.

[0278] In the present disclosure, among the entire frequency resources in the time resource operating as FD, the frequency resources operating as DL are called DL subbands, and the frequency resources operating as UL are called UL subbands.

[0279] In the case of full-duplex operation as described above, full-duplex operation can be performed from both the gNB perspective and the terminal perspective. That is, both the gNB and the terminal can simultaneously transmit and receive DL and UL using the same or different frequency resources in the same time resource. Alternatively, only the gNB can perform full-duplex operation, and the terminal can perform half-duplex operation. The gNB can simultaneously transmit and receive DL and UL using the same or different frequency resources in the same time resource, but the terminal performs only DL reception or UL transmission in a specific time resource. In this case, the gNB performs full-duplex operation by performing DL transmission and UL reception with different terminals at the same time.

[0280] Meanwhile, in the current NR system, a terminal can receive one PDSCH from a base station in the same time resource, and the terminal can transmit one PUSCH to the base station in the same time resource.

[0281] In existing LTE and NR systems, one transport block (TB) can be transmitted via one PDSCH, or up to two transport blocks (TBs) can be transmitted using different spatial resources (e.g., antenna ports, layers). In this case, since the channel environments of the spatial resources through which each TB is transmitted are different, different MCSs, number of layers / ranks, and / or precoders can be applied to the two TBs. In the entire resources through which one TB is transmitted, the same MCS, number of layers / ranks, and / or precoders are applied to the TBs.

[0282] That is, in existing LTE and NR systems, a maximum of two TBs can be transmitted on a single physical channel. These two TBs use the same time / frequency resources but different spatial resources. Therefore, multiple TBs cannot be transmitted on the same physical channel using different time / frequency resources.

[0283] Furthermore, in existing LTE and NR systems, a terminal cannot simultaneously receive or transmit two physical channels with overlapping transmission time resources. Therefore, a single terminal cannot receive multiple PDSCHs or transmit a PUSCH using different frequency resources within the same time resource.

[0284] However, there may be environments where channel quality differs depending on the region of frequency / time resources in which a physical channel is transmitted.

[0285] For example, in a frequency selective fading environment, channel quality may vary depending on the frequency resource.

[0286] Alternatively, channel quality may vary depending on time resources in high frequency band environments and fast fading environments.

[0287] Alternatively, in SBFD and SSFD environments, the link direction in which cells operate may be different for each frequency resource (e.g., subband), and thus the interference environment may be different.

[0288] Additionally, in SBFD and SSFD environments, the SBFD / SSFD operation method (whether the cell performs SBFD / SSFD operation or TDD operation) may differ depending on the time resource, which may lead to different interference environments. For time resources where URLLC data is transmitted, the interference environment may differ compared to resources where it is not.

[0289] As such, channel quality may vary across frequency / time resource domains, and the appropriate MCS, number of layers / ranks, and / or precoders for physical channel transmission may vary across each domain. Therefore, transmitting physical channels using appropriate MCSs, number of layers / ranks, and / or precoders for channel quality across resource domains can help improve performance.

[0290] In consideration of this, the present disclosure proposes an operation in which, when N (e.g., 2) TBs are transmitted from a base station to a specific terminal, frequency / time / spatial resources are divided into N resources with different channel qualities, and the N TBs are transmitted in FDM / TDM / SDM format using different resources.

[0291] At this time, different TBs may be transmitted through the same physical channel (e.g., PDSCH, PUSCH) but may be transmitted in FDM / TDM / SDM format using different resources. Alternatively, different TBs may be transmitted using different physical channels (e.g., PDSCH, PUSCH), and different physical channels may be transmitted in FDM / TDM / SDM format using different resources.

[0292] At this time, each transmission resource can be transmitted by applying an MCS, number of layers / ranks, and / or precoder suitable for each TB.

[0293] In the present disclosure, when N (e.g., 2) TBs are transmitted from a base station to a specific terminal, an operation is proposed in which frequency / time / space resources are divided into N resources with different channel qualities, and the N TBs are transmitted using FDM / TDM / SDM using different resources.

[0294] At this time, different TBs may be transmitted on the same physical channel (e.g., PDSCH, PUSCH) but may be transmitted in FDM / TDM / SDM format using different resources. Alternatively, different TBs may be transmitted using different physical channels (e.g., PDSCH, PUSCH), and different physical channels may be transmitted in FDM / TDM / SDM format using different resources.

[0295] At this time, transmission can be performed by applying an MCS, number of layers / ranks, antenna port(s), and / or precoder suitable for each transmission resource for each TB.

[0296] According to the present disclosure, a terminal may operate as follows (or may be assumed to perform the following process):

[0297] 1. The terminal determines the maximum number of TBs that can be scheduled through one DCI from the base station and / or the multiplexing type between TBs.

[0298] 2. The terminal determines the DCI format and / or the configuration / interpretation method of fields for scheduling TBs based on the maximum number of TBs that can be scheduled through one DCI and / or the multiplexing type between TBs.

[0299] 3. The terminal receives DCI from the base station and schedules reception / transmission of multiple TBs transmitted through different or identical physical channels through one DCI.

[0300] A. When there are two TBs being transmitted and the two TBs are transmitted through FDM via the same or different physical channels,

[0301] i. The terminal receives information about the frequency resources applicable to transmission of each TB from the base station through DCI.

[0302] ii. The terminal receives information about time resources commonly applied to the transmission of TBs from the base station through DCI.

[0303] iii. The terminal receives information about the spatial resources commonly applied to the transmission of TBs from the base station via DCI. If different spatial resources are applied to the transmission of each TB, the terminal receives information about the spatial resources applied to the transmission of each TB from the base station via DCI.

[0304] iv. The terminal independently receives information about the MCS applied to the transmission of each TB from the base station through DCI.

[0305] v. Additionally / independently, the terminal can independently receive information about RV and / or NDI applied to each TB from the base station via DCI.

[0306] B. If there are two TBs being transmitted and the two TBs are transmitted through TDM over the same or different physical channels,

[0307] i. The terminal receives information about the time resources applied to the transmission of each TB from the base station through DCI.

[0308] ii. The terminal receives information about frequency resources commonly applied to transmission of TBs from the base station through DCI.

[0309] iii. The terminal receives information about the spatial resources commonly applied to the transmission of TBs from the base station via DCI. If different spatial resources are applied to the transmission of each TB, the terminal receives information about the spatial resources applied to the transmission of each TB from the base station via DCI.

[0310] iv. The terminal independently receives information about the MCS applied to the transmission of each TB from the base station through DCI.

[0311] v. Additionally / independently, the terminal can independently receive information about RV and / or NDI applied to each TB from the base station via DCI.

[0312] C. If there are two TBs being transmitted and the two TBs are SDM'd and transmitted through the same or different physical channels,

[0313] i. The terminal receives information about the spatial resources applied to the transmission of each TB from the base station through DCI.

[0314] ii. The terminal receives information about frequency resources commonly applied to transmission of TBs from the base station through DCI.

[0315] iii. The terminal receives information about time resources commonly applied to the transmission of TBs from the base station through DCI.

[0316] iv. The terminal independently receives information about the MCS applied to the transmission of each TB from the base station through DCI.

[0317] v. Additionally / independently, the terminal can independently receive information about RV and / or NDI applied to each TB from the base station via DCI.

[0318] 4. The terminal receives / transmits multiple TBs transmitted through different or identical physical channels based on the scheduled information.

[0319] Although the present disclosure is described based on the case where two TBs are dynamically scheduled by DCI, the contents of the present disclosure can also be applied to the case where transmission of two TBs is scheduled semi-persistently, such as SPS-PDSCH and CG (configured grant)-PUSCH.

[0320] When two TBs are dynamically scheduled by DCI, such as DG (dynamic grant)-PDSCH and DG-PUSCH, two TBs can be scheduled through one DCI.

[0321] When two TBs are scheduled semi-statically / semi-permanently, such as SPS-PDSCH and CG-PUSCH, transmission and reception of the two TBs are scheduled through RRC signaling, and additionally, transmission and reception set through MAC-CE and / or DCI signaling can be activated / deactivated.

[0322] <Section 5.1. Independent Frequency Resource Determination Method by TB>

[0323] In this section, we propose an operation in which a terminal schedules and transmits and receives multiple TBs (e.g., two) transmitted from a base station through different frequency resources.

[0324] These multiple TBs may be transmitted over the same physical channel (e.g., PDSCH / PUSCH). When multiple TBs are transmitted over the same physical channel, the multiple TBs may be mapped to different CWs (codewords), so that different CWs may be transmitted over different frequency resources within the PDSCH.

[0325] And / or these multiple TBs may be transmitted via different physical channels (e.g., PDSCH / PUSCH).

[0326] These multiple TBs can be transmitted over the same time resource.

[0327] For these multiple TBs, an independent MCS can be applied to each TB.

[0328] For these multiple TBs, each TB may have an independent number of layers / ranks, antenna port(s), and / or precoder. And / or these multiple TBs may be transmitted with the same number of layers / ranks, antenna port(s), and / or precoder.

[0329] Figure 16 illustrates a frequency resource through which two TBs are transmitted.

[0330] As in (a) or (b) of Fig. 16, two TBs (TB0 and TB1) can be transmitted via the same PDSCH. However, the frequency resources through which TB0 is transmitted and the frequency resources through which TB1 is transmitted within the PDSCH may be different. As in (a) of Fig. 16, the frequency resources through which the two TBs are transmitted may be located consecutively. Alternatively, as in (b) of Fig. 16, the frequency resources through which the two TBs are transmitted may be located non-contiguously.

[0331] Alternatively, as in (c) of FIG. 16, two TBs (TB0 and TB1) may be transmitted via different PDSCHs. For example, TB0 may be transmitted via PDSCH0, and TB1 may be transmitted via PDSCH1. PDSCH0 and PDSCH1 may be transmitted via different frequency resources in the same time resource.

[0332] When a terminal receives multiple TBs scheduled from a base station, it can receive information about the frequency resources through which each TB is transmitted. In the present disclosure, when TB0 and TB1 are scheduled, the frequency resource through which TB0 is transmitted can be referred to as frequency resource 0, and the frequency resource through which TB1 is transmitted can be referred to as frequency resource 1.

[0333] At this time, when the terminal receives scheduling for two TBs, TB0 and TB1, from the base station, the terminal receives information about FDRA0, which is information for indicating a frequency resource 0 resource through which TB0 is transmitted, and FDRA1, which is information for indicating a frequency resource 1 resource through which TB1 is transmitted, from the DCI, and can determine the frequency resources through which TB0 and TB1 are transmitted.

[0334] Methods 1 to 5 below in this section propose a method for a terminal to receive information about FDRA0 and FDRA1 via DCI when two TBs (TB0 and TB1) are scheduled, and to determine the frequency resources for transmission of the two TBs from this. Although the present disclosure describes the method and terminal operation when two TBs are scheduled, the contents of the present disclosure can be extended and applied to cases where two or more TBs are scheduled.

[0335] Method 1. Method of being directed through two independent DCI fields.

[0336] Information about FDRA0, which is information about frequency resource 0 where TB0 is transmitted, and information about FDRA1, which is information about frequency resource 1 where TB1 is transmitted, can be indicated through different fields within the DCI.

[0337] The terminal is instructed to FDRA0 through the first FDRA field in the DCI, and determines frequency resource 0 on which TB0 is transmitted. In addition, the terminal is instructed to FDRA1 through the second FDRA field in the DCI, and determines frequency resource 1 on which TB1 is transmitted.

[0338] Method 2. Method indicated by two FDRA values ​​within one DCI field.

[0339] Information about frequency resource 0 on which TB0 is transmitted and information about frequency resource 1 on which TB1 is transmitted can be indicated through the same field within the DCI.

[0340] In this case, information of FDRA0 and FDRA1 can be indicated through different bits within the DCI field.

[0341] For example, when information on the location of RB or RBG (RB group) that constitutes frequency resources for indicating each FDRA information is indicated as a bitmap, two bitmap pieces of information may be indicated and used to indicate information of FDRA0 and FDRA1, respectively.

[0342] For example, when information on the location of an RB or RBG (RB group) that constitutes a frequency resource for indicating each FDRA information is indicated by a RIV value, two RIV values ​​may be indicated and used to indicate information of FDRA0 and FDRA1, respectively.

[0343] Method 3. How to direct through one FDRA value and offset value.

[0344] To determine information about frequency resource 0 where TB0 is transmitted and information about frequency resource 1 where TB1 is transmitted, one FDRA value may be indicated through DCI. Additionally, an offset value relative to the frequency resource determined by the corresponding FDRA value may be additionally indicated.

[0345] These offset values ​​can be indicated from the base station to the terminal together through DCI scheduling TB0 and TB1. Alternatively, these offset values ​​can be determined semi-statically and indicated from the base station to the terminal through signaling such as RRC.

[0346] In this case, the FDRA indicated through DCI means the FDRA0 value, and the terminal can determine the frequency resource 0 on which TB0 is transmitted through this. By applying the offset value indicated additionally to the FDRA value, the terminal can determine the frequency resource 1 on which TB1 is transmitted.

[0347] At this time, the offset value (e.g., offset_a) may mean a relative offset of the RB or RBG (RB group) position of frequency resource 1 where TB1 is transmitted compared to frequency resource 0 where TB0 is transmitted as determined by the indicated FDRA value.

[0348] For example, the offset_a value may mean an offset value of the RB / RBG location with the lowest index among frequency resources 1 where TB1 is transmitted relative to the RB / RBG location with the highest index among frequency resources 0 where TB0 is transmitted.

[0349] In this case, when the RB / RBG location with the highest index among frequency resources 0 where TB0 is transmitted is called RB(G)#k, the terminal can determine RB(G)#k+offset_a as the lowest index of frequency resources 1 where TB1 is transmitted.

[0350] And / or such offset value (e.g., offset_b) may mean a relative offset of the number of RBs or the number of RBGs of frequency resource 1 on which TB1 is transmitted compared to frequency resource 0 on which TB0 is transmitted as determined by the indicated FDRA value.

[0351] For example, the offset_b value may mean an offset value of the number of RBs / RBGs constituting frequency resource 1 on which TB1 is transmitted compared to the number of RBs / RBGs constituting frequency resource 0 on which TB0 is transmitted. In this case, when the number of RBs / RBGs constituting frequency resource 0 on which TB0 is transmitted is m, the terminal may determine m+offset_b as the number of RBs / RBGs constituting frequency resource 1 on which TB1 is transmitted.

[0352] If this offset_b value is not indicated, the offset_b value can be determined to be 0. That is, the number of RBs / RBGs of frequency resource 0 where TB0 is transmitted and frequency resource 1 where TB1 is transmitted can be determined to be the same.

[0353] Method 4. Method of being directed through one FDRA value and boundary value.

[0354] In order to determine information about frequency resource 0 where TB0 is transmitted and information about frequency resource 1 where TB1 is transmitted, one FDRA value may be indicated through DCI. Additionally, information about boundaries for dividing / distinguishing the frequency resources determined by the FDRA value into frequency resource 0 where TB0 is transmitted and frequency resource 1 where TB1 is transmitted may be additionally indicated.

[0355] This boundary information can be indicated from the base station to the terminal together with DCI scheduling TB0 and TB1.

[0356] Alternatively, such boundary information may be determined semi-statically and indicated to the terminal from the base station through signaling such as RRC.

[0357] Alternatively, such boundary information may be implicitly determined by other information. For example, when a frequency resource on which a terminal operates is composed of a subband capable of only DL reception and a subband capable of both UL transmission and DL reception, and the terminal knows information about the frequency resources constituting the subbands in advance through instructions from a base station or through implementation, the boundaries of the subband capable of only DL reception and the subband capable of both UL transmission and DL reception can be determined as boundaries for separating / distinguishing frequency resource 0 and frequency resource 1.

[0358] The terminal may divide the frequency resources determined by the instructed FDRA value into boundaries, and determine the resource in the frequency region lower than the boundary position among the frequency resources as frequency resource 0 where TB0 is transmitted, and determine the resource in the frequency region higher than the boundary position among the frequency resources as frequency resource 1 where TB1 is transmitted. Or, conversely, the terminal may divide the frequency resources determined by the instructed FDRA value into boundaries, and determine the resource in the frequency region higher than the boundary position among the frequency resources as frequency resource 0 where TB0 is transmitted, and determine the resource in the frequency region lower than the boundary position among the frequency resources as frequency resource 1 where TB1 is transmitted.

[0359] This boundary information can be more specifically indicated as follows, through which the terminal can determine the boundary location.

[0360] For boundary information, the RB / RBG location of the boundary may be indicated. In this case, the RB / RBG location of the boundary may refer to the location of the RB / RBG relative to the lowest RB / RBG location of the frequency resource indicated via FDRA. Alternatively, the RB / PRB location of the boundary may refer to the location of the PRB or CRB where the boundary exists.

[0361] If the boundary location is determined to be RB#a, the terminal can determine the RBs having an RB index smaller than RB#a among the resources included in the frequency resources indicated through FDRA as frequency resource 0 where TB0 is transmitted, and determine the RBs having an RB index equal to or greater than RB#a as frequency resource 1 where TB1 is transmitted.

[0362] Among the frequency resources determined through the FDRA value indicated for boundary information, a value corresponding to the ratio of the resource amounts of frequency resource 0 through which TB0 is transmitted and frequency resource 1 through which TB1 is transmitted may be indicated. At this time, the ratio value may be a value between 0 and 1.

[0363] In this case, when the number of RBs / RBGs constituting the frequency resources indicated through FDRA is M, the frequency resources constituting frequency resource 0 to which TB0 is transmitted may be composed of floor (M x ratio) or ceil (M x ratio) RBs / RBGs among the frequency resources constituting the frequency resources indicated through FDRA, and the frequency resources constituting frequency resource 1 to which TB1 is transmitted may be composed of the remaining RBs / RBGs excluding the frequency resources constituting frequency resource 0 among the frequency resources constituting the frequency resources indicated through FDRA.

[0364] For example, when the number of RBs / RBGs constituting the frequency resource indicated through FDRA is M, among the frequency resources constituting the frequency resource, starting from the lowest RB / RBG and in increasing order of RB / RBG index, the floor(M x ratio) or ceil(M x ratio) RBs / RBGs become the frequency resources constituting the frequency resource 0 through which TB0 is transmitted, and among the frequency resources constituting the frequency resource, the remaining RBs / RBGs excluding the frequency resources constituting the frequency resource 0 can be configured as the frequency resource 1 through which TB1 is transmitted.

[0365] Method 5. Method of judging through unavailable frequency resources.

[0366] In order to determine information about frequency resource 0 where TB0 is transmitted and information about frequency resource 1 where TB1 is transmitted, one FDRA value may be indicated through DCI. Additionally, information about unavailable frequency resources may be additionally indicated to separate / distinguish the frequency resources determined by the FDRA value into frequency resource 0 where TB0 is transmitted and frequency resource 1 where TB1 is transmitted.

[0367] This unavailable frequency resource information can be indicated from the base station to the terminal together with DCI scheduling TB0 and TB1.

[0368] Alternatively, such unavailable frequency resource information may be determined semi-statically and indicated to the terminal from the base station through signaling such as RRC.

[0369] Alternatively, such unavailable frequency resource information may be implicitly determined based on other information. For example, if the frequency resources on which a terminal operates are comprised of subbands capable of DL operation and subbands incapable of DL operation, and the terminal is aware of the frequency resources constituting the subbands in advance, either through base station instructions or through implementation, the subband resources in which DL operation is incapable may be determined to be unavailable frequency resources.

[0370] The terminal can determine the remaining resources, excluding the unavailable frequency resources, among the frequency resources determined through the instructed FDRA value as frequency resources that can be used for actual physical channel transmission and reception. In this case, the resource in the frequency region lower than the unavailable frequency resource among the frequency resources can be determined as frequency resource 0 where TB0 is transmitted, and the resource in the frequency region higher than the unavailable frequency resource among the frequency resources can be determined as frequency resource 1 where TB1 is transmitted. Alternatively, the resource in the frequency region higher than the unavailable frequency resource among the frequency resources can be determined as frequency resource 0 where TB0 is transmitted, and the resource in the frequency region lower than the unavailable frequency resource among the frequency resources can be determined as frequency resource 1 where TB1 is transmitted.

[0371] When two TBs are scheduled semi-statically / semi-permanently, such as SPS-PDSCH and CG-PUSCH, information for determining the frequency resources on which the two TBs are transmitted can be set through RRC and / or MAC-CE signaling.

[0372] Since the purpose of this disclosure is to adjust transmission techniques based on the channel quality of frequency resources, when applying frequency hopping, it may not be appropriate to use MCS and MIMO transmission methods suitable for the frequency resources. Taking this into account, when performing such operations, frequency hopping may not be performed.

[0373] <Section 5.2. Independent Time Resource Determination Method by TB>

[0374] In this section, we propose an operation in which a terminal schedules and transmits and receives multiple (e.g., two) TBs transmitted from a base station through different time resources.

[0375] The time resources through which these multiple TBs are transmitted can be located within the same slot.

[0376] These multiple TBs may be transmitted over the same physical channel (e.g., PDSCH / PUSCH). When multiple TBs are transmitted over the same physical channel, the multiple TBs may be mapped to different CWs, so that different CWs may be transmitted over different time resources within the PDSCH.

[0377] And / or these multiple TBs may be transmitted via different physical channels (e.g., PDSCH / PUSCH).

[0378] These multiple TBs can be transmitted over the same frequency resource.

[0379] For these multiple TBs, an independent MCS can be applied to each TB.

[0380] For these multiple TBs, each TB may have an independent number of layers / ranks, antenna port(s), and / or precoder. And / or these multiple TBs may be transmitted with the same number of layers / ranks, antenna port(s), and / or precoder.

[0381] A terminal can schedule multiple TBs from a base station and receive information about the time resources over which each TB is transmitted. In the present disclosure, when TB0 and TB1 are scheduled via DCI, the time resource over which TB0 is transmitted is referred to as time resource 0, and the time resource over which TB1 is transmitted is referred to as time resource 1.

[0382] At this time, when the terminal receives scheduling for two TBs, TB0 and TB1, from the base station, the terminal receives information about TDRA0, which is information for indicating a time resource 0 resource through which TB0 is transmitted, and TDRA1, which is information for indicating a time resource 1 resource through which TB1 is transmitted, from the DCI, and can determine the time resources through which TB0 and TB1 are transmitted.

[0383] Methods 1 to 4 below in this section propose a method for a terminal to receive information about TDRA0 and TDRA1 via DCI when two TBs (TB0 and TB1) are scheduled, and to determine the frequency resources for transmission of the two TBs from the information. Although the present disclosure describes the method and terminal operation when two TBs are scheduled, the contents of the present disclosure can be extended and applied to cases where two or more TBs are scheduled.

[0384] Method 1. Direction via two independent DCI fields.

[0385] Information about TDRA0, which is information about time resource 0 in which TB0 is transmitted, and information about TDRA1, which is information about time resource 1 in which TB1 is transmitted, can be indicated through different fields within the DCI.

[0386] The terminal is instructed to TDRA0 through the first TDRA field in the DCI, and thereby determines time resource 0 on which TB0 is transmitted. In addition, the terminal is instructed to TDRA1 through the second TDRA field in the DCI, and thereby determines time resource 1 on which TB1 is transmitted.

[0387] At this time, TDRA0 and TDRA1 may be instructed to position time resource 0 and time resource 1 in the same slot. To this end, the same slot offset value may be instructed through TDRA0 and TDRA1.

[0388] At this time, time resource 0 and time resource 1 can be directed not to overlap each other.

[0389] For this purpose, symbol resources indicated through TDRA0 and TDRA1 can be indicated so as not to overlap each other.

[0390] Alternatively, the value of the starting symbol position of the symbol resource indicated by TDRA1 may mean a relative symbol position (i.e., a symbol offset value) with respect to the last symbol position of the time resource 0 indicated by TDRA0. If the last symbol position of the time resource 0 determined by the indication of TDRA0 is symbol #n, and the starting symbol position value of the symbol resource indicated by TDRA1 is k, the first symbol position constituting the time resource 1 may be equal to symbol #n+k+1.

[0391] Method 2. A method instructed through two TDRA values ​​within one DCI field.

[0392] Information about time resource 0 where TB0 is transmitted and information about time resource 1 where TB1 is transmitted can be indicated through the same field within the DCI.

[0393] In this case, information about TDRA0, which is information about time resource 0, and information about TDRA1, which is information about time resource 1, can be indicated through different bits within the DCI field.

[0394] For example, information for determining a single time resource may be included in a TDRA table, and the applicable time resource information may be indicated by indicating a row index of the TDRA table. In this case, information for time resource 0 and time resource 1 may be indicated by indicating two indexes.

[0395] Alternatively, the value indicated by the DCI field may indicate two pieces of time resource information. For example, information for determining two time resources may be included in the TDRA table, and the two pieces of time resource information to be applied may be indicated by indicating the row index of the TDRA table.

[0396] At this time, information about the start symbol and / or symbol length can be independently indicated for time resource 0 and time resource 1. The terminal can determine that the information about the start symbol and / or symbol length indicated first is applied to time resource 0, and can determine that the information about the start symbol and / or symbol length indicated second is applied to time resource 1.

[0397] At this time, the slot offset information for indicating the slot position where the time resource is located may be applied as a single value to both time resource 0 and time resource 1. This may mean that time resource 0 and time resource 1 are located in the same slot.

[0398] Method 3. A method instructed through one TDRA value and an offset value.

[0399] To determine information about time resource 0 where TB0 is transmitted and information about time resource 1 where TB1 is transmitted, a single TDRA value may be indicated via DCI. Additionally, an offset value relative to the time resource determined by the corresponding TDRA value may be additionally indicated.

[0400] These offset values ​​can be indicated from the base station to the terminal together through DCI scheduling TB0 and TB1.

[0401] Alternatively, these offset values ​​can be determined semi-statically and indicated to the terminal from the base station through signaling such as RRC.

[0402] In this case, the TDRA indicated through DCI means the TDRA0 value, and the terminal can determine the time resource 0 where TB0 is transmitted through this.

[0403] By applying an offset value additionally indicated to the corresponding TDRA value, the terminal can determine the time resource 1 in which TB1 is transmitted.

[0404] At this time, the offset value (e.g., offset_a) may mean a relative offset of the symbol position of time resource 1 where TB1 is transmitted compared to time resource 0 where TB0 is transmitted as determined by the indicated TDRA value.

[0405] For example, the offset_a value may mean an offset value of the start symbol position of time resource 1 in which TB1 is transmitted relative to the last symbol position of time resource 0 in which TB0 is transmitted.

[0406] In this case, when the terminal determines that the last symbol position of time resource 0 in which TB0 is transmitted is symbol #k, it can determine that symbol #k+offset_a is the first symbol of time resource 1 in which TB1 is transmitted.

[0407] And / or such offset value (e.g., offset_b) may mean a relative offset of the number of symbols of time resource 1 on which TB1 is transmitted compared to time resource 0 on which TB0 is transmitted as determined by the indicated TDRA value.

[0408] For example, the offset_b value may mean an offset value of the number of symbols constituting time resource 1 in which TB1 is transmitted compared to the number of symbols constituting time resource 0 in which TB0 is transmitted.

[0409] In this case, when the number of symbols constituting time resource 0 in which TB0 is transmitted is m, the terminal can determine m+offset_b as the number of symbols constituting time resource 1 in which TB1 is transmitted.

[0410] If this offset_b value is not indicated, the offset_b value can be determined to be 0. That is, it can be determined that the number of symbols of time resource 0 in which TB0 is transmitted and time resource 1 in which TB1 is transmitted are the same.

[0411] Method 4. A method instructed through one TDRA value and boundary value.

[0412] In order to determine information about time resource 0 where TB0 is transmitted and information about time resource 1 where TB1 is transmitted, a single TDRA value may be indicated via DCI. Additionally, information about boundaries for separating / distinguishing the time resources determined by the TDRA value into time resource 0 where TB0 is transmitted and time resource 1 where TB1 is transmitted may be additionally indicated.

[0413] This boundary information can be indicated from the base station to the terminal together with DCI scheduling TB0 and TB1.

[0414] Alternatively, such boundary information may be determined semi-statically and indicated to the terminal from the base station through signaling such as RRC.

[0415] Alternatively, such boundary information may be implicitly determined by other information. For example, when the time resource on which the terminal operates is composed of a symbol resource that performs TDD (half-duplex) operation and a symbol resource that enables SBFD / SSFD (full-duplex) operation, and the terminal knows information about the two types of time resources in advance through a base station instruction or through implementation, the boundary of the symbol resource that enables only TDD operation and the symbol resource that enables SBFD / SSFD operation can be determined as the boundary for separating / distinguishing time resource 0 and time resource 1.

[0416] The terminal may divide the time resources determined by the instructed TDRA value into boundaries, and determine the resource of the time region before the boundary position among the time resources as time resource 0 in which TB0 is transmitted, and determine the resource of the time region after the boundary position among the time resources as time resource 1 in which TB1 is transmitted. Or, conversely, the terminal may divide the time resources determined by the instructed TDRA value into boundaries, and determine the time resource before the boundary position among the time resources as time resource 0 in which TB0 is transmitted, and determine the time resource after the boundary position among the time resources as time resource 1 in which TB1 is transmitted.

[0417] This boundary information can be more specifically indicated as follows, through which the terminal can determine the boundary location.

[0418] For boundary information, the symbol position of the boundary may be indicated. In this case, the symbol position of the boundary may refer to the relative symbol position of the starting symbol of the time resource indicated by the TDRA. Alternatively, the symbol position of the boundary may refer to the symbol index of the boundary position within the slot where the time resource exists.

[0419] If the boundary position is determined to be symbol #a, the terminal can determine the symbols having an index preceding symbol #a among the resources included in the time resources indicated by TDRA as time resource 0 in which TB0 is transmitted, and determine the symbols located after symbol #a as time resource 1 in which TB1 is transmitted.

[0420] Among the time resources determined by the TDRA value indicated for boundary information, a value corresponding to the ratio of the resource amounts of time resource 0, where TB0 is transmitted, and time resource 1, where TB1 is transmitted, may be indicated. At this time, the ratio value may be a value between 0 and 1.

[0421] In this case, when the number of symbols constituting the time resource indicated through TDRA is M, the time resource constituting the time resource 0 through which TB0 is transmitted may be composed of floor (M x ratio) or ceil (M x ratio) symbols among the time resources constituting the time resource indicated by TDRA, and the time resource constituting the time resource 1 through which TB1 is transmitted may be composed of the remaining symbols excluding the time resources constituting the time resource 0 among the time resources constituting the time resource indicated by TDRA.

[0422] For example, when the number of symbols constituting the time resource indicated through TDRA is M, the floor(M x ratio) or ceil(M x ratio) symbols in increasing order of symbol index from the start symbol among the time resources constituting the time resource become the time resources constituting the time resource 0 through which TB0 is transmitted, and the remaining symbols, excluding the time resources constituting the time resource 0, among the time resources constituting the time resource can be configured as the time resource 1 through which TB1 is transmitted.

[0423] When two TBs are scheduled semi-statically / semi-permanently, such as SPS-PDSCH and CG-PUSCH, information for determining the time resources on which the two TBs are transmitted can be set through RRC and / or MAC-CE signaling.

[0424] <Section 5.3. Method for Determining Space Resources by TB>

[0425] This section proposes an operation for determining spatial resource information applicable to each TB when a terminal receives multiple TBs (e.g., two) from a base station and these multiple TBs are transmitted via different frequency or time resources. This spatial resource information may include the number of ranks / layers, DMRS port(s), and / or precoder information.

[0426] Below, we propose a method for determining the spatial resources for transmission of two TBs (TB0 and TB1) via DCI when a terminal is scheduled for two TBs. While the present disclosure describes the method and terminal operation when two TBs are scheduled, the contents of the present disclosure can be extended and applied to cases where two or more TBs are scheduled.

[0427] Approach 1. Applying the same space resources to both TBs.

[0428] When a terminal is scheduled to receive / transmit two TBs transmitted from a base station through different or identical physical channels, the same spatial resources may be applied to the two TBs. That is, the same number of layers / ranks, DMRS ports(s), and / or precoders may be applied to the two TBs.

[0429] When two TBs are transmitted using different frequency or time resources using a single physical channel, the two TBs can be transmitted by being mapped to two codewords (CWs). In this case, the two CWs can be transmitted using different frequency or time resources. However, the two CWs can be transmitted using the same spatial resources (DMRS port(s), number of ranks / layers, and / or precoding matrix).

[0430] That is, for example, when TB0 and TB1 are scheduled through one DCI, TB0 and TB1 are mapped to CW0 and CW1, respectively, and when the two TBs are transmitted in TDM, CW0 and CW1 may be transmitted using different time resources, and when the two TBs are transmitted in FDM, CW0 and CW1 may be transmitted using different frequency resources. However, CW0 and CW1 may be transmitted using the same spatial resources (DMRS port(s), number of ranks / layers, and / or precoding matrix).

[0431] To this end, the following actions are proposed:

[0432] The terminal can determine the applicable antenna port information by interpreting the antenna port field differently depending on whether the two TBs are transmitted as SDM or as FDM / TDM.

[0433] Specifically, when two TBs are scheduled to be transmitted in FDM / TDM, the terminal can interpret the antenna port field as if one TB were scheduled.

[0434] For example, if the DMRS port(s) information indicated by the value indicated through the antenna port field changes depending on the number of enabled codewords, the terminal may interpret the antenna port field as if one TB is scheduled and one codeword is used, for a case where two TBs transmitted in FDM / TDM are scheduled.

[0435] This operation can be applied when the terminal receives TB from the base station via PDSCH.

[0436] When the minimum number of ranks required for two codewords to be transmitted in SDM is R (e.g., R=5), when two TBs scheduled through the same DCI are transmitted in FDM / TDM, the terminal can assume that the base station will indicate a rank number lower than R. In this case, the terminal must not assume that one codeword (TB) is transmitted even if a rank number lower than R is indicated. In other words, the number of transmitted codewords / TBs must not be determined based on the indicated rank.

[0437] The terminal receives information about one precoder matrix and / or antenna port(s) from the base station and determines that this is applied equally to the transmission of the two TBs.

[0438] This behavior can be applied when the terminal transmits TB to the base station via PUSCH.

[0439] When two TBs are transmitted using different physical channels with different frequency or time resources, the two TBs may be transmitted via different PDSCHs or PUSCHs. In this case, the two PDSCHs or PUSCHs may be transmitted via different frequency or time resources. However, the two PDSCHs or PUSCHs may be transmitted using the same spatial resources (DMRS port(s), number of ranks / layers, and / or precoding matrix).

[0440] For example, when TB0 and TB1 are scheduled through one DCI, TB0 and TB1 may be transmitted through PDSCH0 and PDSCH1, respectively, and TB0 may be mapped to CW0 of PDSCH0 and TB1 may be mapped to CW0 of PDSCH1. When the two TBs are transmitted in TDM, CW0 of PDSCH0 and CW0 of PDSCH1 may be transmitted using different time resources, and when the two TBs are transmitted in FDM, CW0 of PDSCH0 and CW0 of PDSCH1 may be transmitted using different frequency resources. However, CW0 of PDSCH0 and CW0 of PDSCH1 may be transmitted using the same spatial resources (DMRS port(s), number of ranks / layers, and / or precoding matrix).

[0441] To this end, the following actions are proposed:

[0442] When two TBs are transmitted through FDM / TDM, the terminal applies the indicated spatial resource information (antenna port(s) information, rank / layer number information, and / or precoding matrix information) equally to the transmission of the two TBs.

[0443] In this case, the terminal may expect that spatial resource information (antenna port(s) information, rank / layer number information, and / or precoding matrix information) for one CW will be indicated via DCI. In this case, the terminal may determine that the spatial resource information applies to the transmission of two TBs.

[0444] [Table 8]

[0445]

[0446] Approach 2. Applying different spatial resource information to the two TBs.

[0447] When a terminal is scheduled to receive / transmit two TBs transmitted from a base station through different or identical physical channels, different number of layers / ranks, DMRS port(s), and / or precoder information may be applied to the two TBs.

[0448] That is, for example, when TB0 and TB1 are scheduled through one DCI, TB0 and TB1 are mapped to CW0 and CW1, respectively, and when the two TBs are transmitted in TDM, CW0 and CW1 may be transmitted using different time resources, and when the two TBs are transmitted in FDM, CW0 and CW1 may be transmitted using different frequency resources. In this case, CW0 and CW1 may be transmitted using different DMRS port(s), rank / layer numbers, and / or precoding matrices.

[0449] To this end, the following actions are proposed:

[0450] The terminal can independently instruct or determine information about the antenna port(s) applied to the two TBs when the two TBs are transmitted in FDM / TDM.

[0451] For example, information about the antenna port(s) applicable to each TB can be independently indicated via two DCI fields.

[0452] In this case, the terminal may interpret each antenna port field as if two TBs were actually scheduled, but the terminal may interpret each antenna port field as if one TB were scheduled.

[0453] For example, if the DMRS port(s) information indicated by the value indicated through the antenna port field changes depending on the number of enabled codewords, the terminal may interpret the antenna port field as if one TB is scheduled and one codeword is used for a case where two TBs transmitted in FDM / TDM are scheduled.

[0454] Alternatively, for example, information about antenna port(s) applied to one TB may be indicated, and an alpha value may additionally be indicated to determine antenna port(s) applied to another TB. In this case, if a total of n DMRS port(s) are indicated as antenna port(s) applied to one TB, the terminal may determine that n-alpha DMRS port(s) are applied to the other TB in order of increasing port index, starting from the DMRS port with the smallest port index among the n DMRS port(s).

[0455] When two TBs are transmitted via FDM / TDM, the terminal can independently receive or determine information regarding the number of layers / ranks applied to the two TBs. For example, information regarding the number of layers / ranks applied to each TB can be independently indicated via DCI.

[0456] This behavior can be applied when the terminal transmits TB to the base station via PUSCH.

[0457] When two TBs are transmitted in FDM / TDM mode, the terminal can independently receive or determine information about the precoding matrix applied to the two TBs. For example, information about the precoding matrix applied to each TB can be independently indicated via DCI.

[0458] This behavior can be applied when the terminal transmits TB to the base station via PUSCH.

[0459] <Section 5.4. Adaptation of Multiplexing Types>

[0460] When multiple TBs (e.g., two TBs) can be multiplexed and transmitted to a specific terminal using different frequency, time, and / or spatial resources, the appropriate multiplexing method for transmitting the multiple TBs may vary depending on the channel conditions between the base station and the terminal. For example, if the terminal exists in an environment with a lot of interference in a specific frequency resource or an environment with high channel selectivity for each frequency resource, it may be useful to divide the frequency resource into two areas and transmit the two TBs by FDM so that MCS, etc. can be applied differently to different frequency resources. However, if the channel conditions for the frequency / time resources are not significantly different, it may be better to transmit the two TBs by SDM using different spatial resources.

[0461] Considering this, the present disclosure proposes an operation for adapting the multiplexing scheme of two TBs when multiple TBs are scheduled from a base station to a terminal. The present disclosure describes the method and terminal operation when two TBs are scheduled, as an example of multiple TBs. However, the contents of the present disclosure can be extended and applied to cases where two or more TBs are scheduled.

[0462] A terminal can be scheduled for one or two TBs from a base station. If two TBs are scheduled, the two TBs may be transmitted using different frequency, time, or spatial resources. In this case, we propose a method for the terminal to determine the multiplexing scheme (FDM, TDM, or SDM) of the two TBs.

[0463] Method 1. Semi-static adaptation

[0464] The terminal can determine the multiplexing method of two TBs when two TBs are scheduled through one DCI as follows.

[0465] Method 1-1.

[0466] The terminal can be configured with a multiplexing method from the base station via RRC and / or MAC-CE signaling when two TBs are scheduled through the same DCI.

[0467] At this time, the DCI format received by the terminal for data scheduling may vary depending on the multiplexing method applied to the transmission of the two TBs. In this case, the terminal may monitor the DCI format associated with / related to the indicated multiplexing method.

[0468] And / or, depending on the applied multiplexing method, the field configuration of the DCI received by the terminal for data scheduling may vary. In this case, the total length of the DCI, the configuration / number of fields within the DCI, and / or the field length may vary. In this case, the terminal can receive and interpret the DCI by applying the configuration of the DCI fields according to the indicated multiplexing method.

[0469] For example, the number or length of FDRA fields may be different depending on whether two TBs are transmitted in FDM or not. For example, if two TBs are transmitted in FDM, the above<TB 별 독립적인 주파수 자원 판단 방법> As in , the frequency resources used for transmission of two TBs can be indicated / determined. Therefore, when two TBs are transmitted in FDM, the number of FDRA fields may increase to two or the length of the FDRA field may increase compared to the case where this is not the case.

[0470] Method 1-2.

[0471] Depending on the multiplexing method applied to the transmission of the two TBs, the DCI format received by the terminal for data scheduling may vary. In other words, the multiplexing method applied to the transmission of the two TBs may be determined based on the DCI format received by the terminal.

[0472] Considering this, the terminal can receive the DCI format it monitors from the base station via RRC and / or MAC-CE signaling. In this case, the terminal can determine the multiplexing method applied to the transmission of the two TBs based on the DCI format it is instructed to monitor.

[0473] When two TBs are scheduled semi-statically / semi-permanently, such as SPS-PDSCH and CG-PUSCH, the multiplexing scheme applied to the transmission of the two TBs can be indicated through RRC signaling that configures the transmission and reception of the physical channel. And / or, when MAC-CE signaling that activates the physical channel exists, the multiplexing scheme applied to the transmission of the two TBs can be indicated through such signaling.

[0474] Method 2. Blind detection of multiple DCI formats / lengths

[0475] The terminal can determine the multiplexing method of two TBs when the two TBs are scheduled as follows.

[0476] Method 2-1.

[0477] Depending on the multiplexing method applied to the transmission of the two TBs, the DCI format received by the terminal for data scheduling may vary. In other words, the multiplexing method applied to the transmission of the two TBs may be determined based on the DCI format received by the terminal.

[0478] At this time, the terminal can monitor multiple DCI formats to determine the multiplexing method when two TBs are scheduled via the same DCI. By monitoring multiple DCI formats, the terminal can determine the multiplexing method applied to the transmission of the two TBs based on the DCI format of the received DCI.

[0479] Method 2-2.

[0480] Depending on the multiplexing method applied to the transmission of the two TBs, the length of the DCI received by the terminal for data scheduling may vary.

[0481] At this time, the terminal can monitor multiple DCI lengths to determine the multiplexing method when two TBs are scheduled through the same DCI format. The terminal can monitor multiple DCI lengths and determine the multiplexing method applied to the transmission of the two TBs based on the DCI length of the DCI received.

[0482] Method 3. Dynamic instruction / decision by DCI

[0483] The terminal can determine the multiplexing method of two TBs when two TBs are scheduled through one DCI as follows.

[0484] Method 3-1. Explicit indication

[0485] The terminal can be instructed by the base station via DCI on the multiplexing method when two TBs are scheduled via the same DCI.

[0486] More specifically, information about the multiplexing method between two TBs scheduled through the DCI that schedules the two TBs can be indicated through an explicit field of the DCI.

[0487] Additionally, the DCI field can indicate the multiplexing method between two TBs and the number of TBs scheduled. For example, if the DCI field indicates 0, it means that one TB is scheduled, and if it indicates 1, 2, or 3, it can mean that two TBs are transmitted using SDM, FDM, or TDM, respectively.

[0488] Method 3-2. A method of implicitly judging based on the values ​​of specific field(s).

[0489] The terminal can implicitly determine the multiplexing method when two TBs are scheduled through the same DCI through the value or combination of values ​​of some field(s) in the DCI.

[0490] For example, the terminal can determine the multiplexing method to be applied to the transmission of two TBs by using all or some of the following judgment methods.

[0491] Decision 1. The terminal can determine the time resources applied to the two TBs through instructions from the base station, and if two different time resources are indicated / determined, it can determine that TDM is applied to the transmission of the two TBs.

[0492] The terminal may determine that TDM is not applied for transmission of two TBs (i.e., FDM or SDM is applied for transmission of two TBs) when only one time resource is indicated, when two time resources are indicated but only one time resource is valid, or when both time resources are identical.

[0493] Decision 2. The terminal can determine the frequency resources applied to the two TBs through instructions from the base station, and if two different frequency resources are indicated / determined, it can determine that FDM is applied to the transmission of the two TBs.

[0494] If only one frequency resource is indicated, if two frequency resources are indicated but only one frequency resource is valid, or if the two frequency resources are identical, it can be determined that FDM is not applied for transmission of the two TBs (i.e., TDM or SDM is applied for transmission of the two TBs).

[0495] Decision 3. When the minimum number of ranks required for two codewords to be transmitted in SDM is R (e.g., R=5), if the terminal receives a rank number greater than R from the base station, the terminal can determine that SDM is applied for transmission of the two TBs.

[0496] In this case, if the terminal is instructed by the base station to have a rank number smaller than R, the terminal can determine that SDM is not applied for transmission of the two TBs (i.e., FDM or TDM is applied for transmission of the two TBs).

[0497] At this time, for example, based on the above judgments 1 and 2, the terminal can determine whether TDM or FDM is applied to the transmission of the two TBs. If it is not determined through these judgments that TDM or FDM is applied, it can be determined that SDM is applied to the transmission of the two TBs.

[0498] Alternatively, for example, based on the above judgments 1 and 3, the terminal can determine whether TDM or SDM is applied to the transmission of the two TBs. If it is not determined through these judgments that TDM or SDM is applied, it can be determined that FDM is applied to the transmission of the two TBs.

[0499] Alternatively, for example, SDM or FDM may be applied to the transmission of two TBs. In this case, whether SDM is applied to the transmission of the two TBs can be determined based on the above judgment 3. If SDM is not determined to be applied based on this judgment, FDM may be determined to be applied to the transmission of the two TBs.

[0500] Methods 3-1 and 3-2 may be combined and applied to determine the multiplexing method applied between two TBs. For example, by applying determination 3 of method 3-2, the terminal can determine whether SDM is applied for transmission of the two TBs. If it is determined that SDM is not applied for transmission of the two TBs, the terminal can apply method 3-1 to determine the multiplexing method applied to transmission of the two TBs among FDM and TDM through an explicit field in the DCI.

[0501] When two TBs are scheduled semi-statically / semi-permanently, such as SPS-PDSCH, CG-PUSCH, and there is DCI signaling to activate the physical channel, the multiplexing scheme to be applied to the transmission of the two TBs can be indicated through this signaling.

[0502] As described above, depending on the multiplexing method of the two TBs determined by the terminal, the field configuration, number of fields, length of fields, and / or method of interpreting fields of some fields of DCI received by the terminal for scheduling of the two TBs may vary.

[0503] For the cases where TDM is applied and when it is not applied for transmission of two TBs,

[0504] 1) The number of DCI fields indicating time resources may vary. When TDM is applied to the transmission of two TBs, there are two DCI fields indicating time resources, and the time resources applied to TB0 and TB1 can be indicated by the two DCI fields, respectively. On the other hand, when TDM is not applied to the transmission of two TBs, there is one DCI field indicating time resources, and one time resource information can be indicated.

[0505] 2) The TDRA table for determining the time resource information indicated by the value of the DCI field indicating the time resource may be different. That is, the TDRA table applied may be different when TDM is applied for transmission of two TBs and when it is not. When TDM is applied for transmission of two TBs, the terminal may interpret the DCI field indicating the time resource by applying the TDRA table containing information for indicating (at most) two time resources, and when TDM is not applied for transmission of two TBs, the terminal may interpret the DCI field indicating the time resource by applying the TDRA table containing information for indicating one time resource.

[0506] For the cases where FDM is applied and when it is not applied for transmission of two TBs,

[0507] 1) The number of DCI fields indicating frequency resources may vary. When FDM is applied to the transmission of two TBs, there are two DCI fields indicating frequency resources, and the frequency resources applied to TB0 and TB1 can be indicated by the two DCI fields, respectively. On the other hand, when FDM is not applied to the transmission of two TBs, there is one DCI field indicating frequency resources, and one frequency resource information can be indicated.

[0508] 2) The length and / or indicating information of the DCI field indicating frequency resources may vary.

[0509] For example, when a method such as the above 'Method 2' is applied to indicate two frequency resources, when FDM is applied for transmission of two TBs, two bitmap information or RIV information may be indicated through the DCI field for indicating frequency resources. On the other hand, when FDM is not applied for transmission of two TBs, one bitmap information or RIV information may be indicated through the DCI field for indicating frequency resources. In this case, the terminal may determine the length of the DCI field for indicating frequency resources differently when FDM is applied for transmission of two TBs and when it is not. And / or the terminal may determine the size of the RBG (RBG) used for indicating frequency resources differently when FDM is applied for transmission of two TBs and when it is not. For example, when FDM is applied for transmission of two TBs, an RBG size twice as large as that when FDM is not applied for transmission of two TBs may be applied.

[0510] Figure 17 illustrates an operation method of the terminal.

[0511] Referring to FIG. 17, a terminal receives downlink control information (DCI) scheduling a plurality of transport blocks from a base station through a control channel, and applies (interprets) fields of the DCI based on multiplexing information indicating a multiplexing method of the plurality of transport blocks in a shared channel (S171).

[0512] The above multiplexing method may be any one of FDM (frequency division multiplexing), TDM (time division multiplexing), and SDM (spatial division multiplexing).

[0513] In the case where the above multiplexing method is i) FDM or TDM and ii) SDM, for example, the antenna port field included in the DCI may be interpreted differently.

[0514] The terminal receives the plurality of transmission blocks from the base station through a shared channel (S172).

[0515] The multiplexing information can be received through at least one of an RRC (radio resource control) information element (IE), a MAC CE (medium access control control element), and the DCI. That is, the multiplexing information can be included in the DCI or provided separately.

[0516] If the above-mentioned multiple transport blocks are two transport blocks, the two transport blocks can be received through two frequency resources determined based on one FDRA value and a boundary value included in the DCI. This has been described in detail in Method 4 of Section 5.1.

[0517] If the above-mentioned multiple transport blocks are two transport blocks, the two transport blocks can be received through two time resources determined based on one TDRA value and offset included in the DCI. This has been described in detail in Method 3 of Section 5.2.

[0518] If the above-mentioned multiple transport blocks are two transport blocks, the two transport blocks can be received through two time resources determined based on one TDRA (time domain resource allocation) value and a boundary value included in the DCI. This has been described in detail in Method 4 of Section 5.2.

[0519] If the above-mentioned multiple transport blocks are two transport blocks, the spatial resource information provided by the DCI for one of the two transport blocks may be equally applied to the other transport block. This has been described in detail in Approach 1 of Section 5.3.

[0520] The above control channel may be a physical downlink control channel (PDCCH), and the above shared channel may be a physical downlink shared channel (PDSCH).

[0521] There may be environments where channel quality differs depending on the frequency / time resource region in which a single physical channel is transmitted. In such environments, modulation and coding schemes (MCS), the number of layers / ranks, and / or precoders appropriate for the transmission of the physical channel may differ depending on the frequency / time resource region. According to the method according to the present disclosure, fields of DCI for scheduling the plurality of transport blocks are applied (interpreted) based on multiplexing information indicating a multiplexing method of the plurality of transport blocks in a shared channel. This enables transmission of transport blocks through a physical channel using an MCS, the number of layers / ranks, and / or a precoder appropriate for the channel quality depending on the resource region, thereby increasing the throughput of the system and improving its performance.

[0522] Figure 18 illustrates the signaling process and operation between a base station and a terminal.

[0523] Referring to FIG. 18, the base station provides multiplexing information to the terminal informing it of a multiplexing method of multiple transmission blocks in a shared channel (e.g., PUSCH, PDSCH) (S181).

[0524] The base station transmits downlink control information (DCI) scheduling multiple transport blocks via PDCCH (S182).

[0525] The base station transmits multiple transmission blocks via PDSCH (S183).

[0526] The terminal interprets / applies the fields of the DCI based on the multiplexing information and receives / decodes the plurality of transmission blocks (S184).

[0527] Figure 19 illustrates a wireless device applicable to the present specification.

[0528] Referring to FIG. 19, the first wireless device (100) and the second wireless device (200) can transmit and receive wireless signals through various wireless access technologies (e.g., LTE, NR).

[0529] A first wireless device (100) includes at least one processor (102) and at least one memory (104), and may further include at least one transceiver (106) and / or at least one antenna (108). The at least one processor (102, hereinafter simply referred to as a processor) controls at least one memory (104, hereinafter simply referred to as a memory) and / or at least one transceiver (106, hereinafter simply referred to as a transceiver or a transceiver), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (102) may process information in the memory (104) to generate first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver (106). In addition, the processor (102) may receive a wireless signal including second information / signal through the transceiver (106), and then store information obtained from signal processing of the second information / signal 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 perform some or all of the processes controlled by the processor (102), or may store software code including commands for performing the descriptions, functions, procedures, 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 wireless communication technology (e.g., LTE, NR). The transceiver (106) may be connected to the processor (102) and may transmit and / or receive a wireless signal through one or more antennas (108). The transceiver (106) may include a transmitter and / or a receiver. The transceiver (106) may be used interchangeably with an RF (Radio Frequency) unit.In this specification, wireless device may also mean a communication modem / circuit / chip.

[0530] The processor (102) receives downlink control information (DCI) scheduling a plurality of transport blocks from a base station via a control channel (e.g., PDCCH) and receives the plurality of transport blocks from the base station via a shared channel (e.g., PDSCH). The processor (102) receives multiplexing information from the base station indicating a multiplexing method of the plurality of transport blocks on the shared channel and applies / interprets fields of the DCI based on the multiplexing information. The specific operation thereof has been described with reference to FIGS. 16 to 18.

[0531] A second wireless device (200) includes at least one processor (202), at least one memory (204), and may further include at least one transceiver (206) and / or at least one antenna (208). The processor (202) controls the memory (204) and / or the transceiver (206), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202) may process information in the memory (204) to generate third information / signal, and then transmit a wireless signal including the third information / signal via the transceiver (206). In addition, the processor (202) may receive a wireless signal including fourth information / signal via the transceiver (206), and then store information obtained from signal processing of the fourth information / signal in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may perform some or all of the processes controlled by the processor (202), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation 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 wireless communication technology (e.g., LTE, NR). The transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals via one or more antennas (208). The transceiver (206) may include a transmitter and / or a receiver. The transceiver (206) may be used interchangeably with an RF unit. In this specification, a wireless device may also mean a communication modem / circuit / chip.

[0532] The processor (202) transmits downlink control information (DCI) scheduling a plurality of transmission blocks to a terminal via a control channel, and transmits the plurality of transmission blocks to the terminal via a shared channel. In addition, the processor (202) provides the terminal with multiplexing information indicating a multiplexing method of the plurality of transmission blocks on the shared channel, and the fields of the DCI are interpreted based on the multiplexing information. The specific operation thereof has been described with reference to FIGS. 16 to 18.

[0533] Hereinafter, the hardware elements of the wireless device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors (102, 202) may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed herein, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) can receive signals (e.g., baseband signals) from one or more transceivers (106, 206) and obtain PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed herein.

[0534] The one or more processors (102, 202) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. The one or more processors (102, 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 the one or more processors (102, 202). The one or more processors (102, 202) may also be implemented by at least one computer-readable medium (CRM) containing instructions based on which at least one processor is executed.

[0535] For example, at least one computer readable medium (CRM) including instructions that are executed by at least one processor, performs the operations of receiving downlink control information (DCI) scheduling a plurality of transport blocks from a base station through a control channel (e.g., a PDCCH), receiving the plurality of transport blocks from the base station through a shared channel (e.g., a PDSCH), receiving multiplexing information indicating a multiplexing method of the plurality of transport blocks on the shared channel from the base station, and applying / interpreting fields of the DCI based on the multiplexing information. The specific operations have been described with reference to FIGS. 16 to 18.

[0536] The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions. The firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be included in one or more processors (102, 202) or stored in one or more memories (104, 204) and executed by one or more processors (102, 202). The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions.

[0537] One or more memories (104, 204) may be coupled to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories (104, 204) may be configured as ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories (104, 204) may be located internally and / or externally to the one or more processors (102, 202). Additionally, the one or more memories (104, 204) may be coupled to the one or more processors (102, 202) via various technologies, such as wired or wireless connections.

[0538] One or more transceivers (106, 206) can transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or flowcharts of this document, to one or more other devices. One or more transceivers (106, 206) can receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts of this document, from one or more other devices. For example, one or more transceivers (106, 206) can be connected to one or more processors (102, 202) and can transmit and receive wireless signals. For example, one or more processors (102, 202) can control one or more transceivers (106, 206) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (102, 202) may control one or more transceivers (106, 206) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (106, 206) may be coupled to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and receive user data, control information, wireless signals / channels, or the like, as referred to in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein, via one or more antennas (108, 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, 206) can convert received user data, control information, wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using one or more processors (102, 202).One or more transceivers (106, 206) may convert user data, control information, wireless signals / channels, etc. processed by one or more processors (102, 202) from baseband signals to RF band signals. For this purpose, one or more transceivers (106, 206) may include an (analog) oscillator and / or filter.

[0539] Figure 20 illustrates another example of a wireless device.

[0540] According to FIG. 20, the wireless device may include at least one processor (102, 202), at least one memory (104, 204), at least one transceiver (106, 206), and one or more antennas (108, 208).

[0541] The difference between the example of the wireless device described in FIG. 19 and the example of the wireless device in FIG. 20 is that in FIG. 19, the processor (102, 202) and the memory (104, 204) are separated, whereas in the example of FIG. 20, the memory (104, 204) is included in the processor (102, 202). For example, the processor and the memory may constitute a single chipset.

[0542] Fig. 21 illustrates an example of a signal processing module structure. Here, signal processing may be performed in the processor (102, 202) of Fig. 19.

[0543] Referring to FIG. 21, a transmission device (e.g., a processor, a processor and a memory, or a processor and a transceiver) within a terminal or a base station may include a scrambler (301), a modulator (302), a layer mapper (303), an antenna port mapper (304), a resource block mapper (305), and a signal generator (306).

[0544] A transmitting device can transmit one or more codewords. The coded bits within each codeword are scrambled by a scrambler (301) and transmitted over a physical channel. A codeword may also be referred to as a data string and may be equivalent to a transport block, which is a data block provided by the MAC layer.

[0545] The scrambled bits are modulated into complex-valued modulation symbols by a modulator (302). The modulator (302) can modulate the scrambled bits according to a modulation scheme and arrange them into complex-valued modulation symbols that represent positions on a signal constellation. There is no limitation on the modulation scheme, and m-PSK (m-Phase Shift Keying) or m-QAM (m-Quadrature Amplitude Modulation) can be used to modulate the encoded data. The modulator may be referred to as a modulation mapper.

[0546] The complex modulation symbols may be mapped to one or more transmission layers by a layer mapper (303). The complex modulation symbols on each layer may be mapped by an antenna port mapper (304) for transmission on an antenna port.

[0547] The resource block mapper (305) can map the complex modulation symbol for each antenna port to an appropriate resource element within a virtual resource block (VRB) allocated for transmission. The resource block mapper can map the VRB to a physical resource block (PRB) according to an appropriate mapping scheme. The resource block mapper (305) can assign the complex modulation symbol for each antenna port to an appropriate subcarrier and multiplex it according to the user.

[0548] The signal generator (306) can generate a complex-valued time domain OFDM symbol signal by modulating a complex modulation symbol, for example, an antenna-specific symbol, for each antenna port, with a specific modulation method, for example, an Orthogonal Frequency Division Multiplexing (OFDM) method. The signal generator can perform an Inverse Fast Fourier Transform (IFFT) on the antenna-specific symbol, and a Cyclic Prefix (CP) can be inserted into the time domain symbol on which the IFFT is performed. The OFDM symbol is transmitted to a receiving device through each transmitting antenna through digital-to-analog conversion, frequency uplink conversion, etc. The signal generator can include an IFFT module, a CP inserter, a Digital-to-Analog Converter (DAC), a frequency uplink converter, etc.

[0549] Fig. 22 illustrates another example of the signal processing module structure within a transmission device. Here, signal processing may be performed in a processor of a terminal / base station, such as the processor (102, 202) of Fig. 19.

[0550] Referring to FIG. 22, a transmission device (e.g., a processor, a processor and a memory, or a processor and a transceiver) in a terminal or a base station may include a scrambler (401), a modulator (402), a layer mapper (403), a precoder (404), a resource block mapper (405), and a signal generator (406).

[0551] The transmitting device can transmit coded bits within a codeword through a physical channel after scrambling the coded bits within the codeword by a scrambler (401).

[0552] The scrambled bits are modulated into complex modulation symbols by a modulator (402). The modulator can modulate the scrambled bits according to a predetermined modulation scheme and arrange them into complex modulation symbols representing positions on a signal constellation. There is no limitation on the modulation scheme, and pi / 2-BPSK (pi / 2-Binary Phase Shift Keying), m-PSK (m-Phase Shift Keying), or m-QAM (m-Quadrature Amplitude Modulation) can be used to modulate the encoded data.

[0553] The above complex modulation symbol can be mapped to one or more transmission layers by the layer mapper (403).

[0554] The complex modulation symbols on each layer can be precoded by the precoder (404) for transmission on the antenna ports. Here, the precoder may perform precoding after performing transform precoding on the complex modulation symbols. Alternatively, the precoder may perform precoding without performing transform precoding. The precoder (404) may process the complex modulation symbols in a MIMO manner according to multiple transmission antennas to output antenna-specific symbols and distribute the antenna-specific symbols to the corresponding resource block mapper (405). The output z of the precoder (404) can be obtained by multiplying the output y of the layer mapper (403) by the precoding matrix W of NХM. Here, N is the number of antenna ports and M is the number of layers.

[0555] The resource block mapper (405) maps the demodulation modulation symbol for each antenna port to the appropriate resource element within the virtual resource block allocated for transmission.

[0556] The resource block mapper (405) can assign complex modulation symbols to appropriate subcarriers and multiplex them according to the user.

[0557] The signal generator (406) can generate a complex-valued time domain OFDM (Orthogonal Frequency Division Multiplexing) symbol signal by modulating a complex modulation symbol with a specific modulation method, for example, OFDM. The signal generator (406) can perform an Inverse Fast Fourier Transform (IFFT) on an antenna-specific symbol, and a Cyclic Prefix (CP) can be inserted into the time domain symbol on which the IFFT has been performed. The OFDM symbol is transmitted to a receiving device through each transmitting antenna after going through digital-to-analog conversion, frequency upconversion, etc. The signal generator (406) can include an IFFT module, a CP inserter, a Digital-to-Analog Converter (DAC), a frequency uplink converter, etc.

[0558] The signal processing process of the receiving device may be configured in reverse order of the signal processing process of the transmitter. Specifically, the processor of the receiving device performs decoding and demodulation on a wireless signal received externally through the antenna port(s) of the transceiver. The receiving device may include a plurality of multiple receiving antennas, and each signal received through the receiving antenna is restored to a baseband signal and then multiplexed and MIMO demodulated to be restored to a data sequence originally intended to be transmitted by the transmitting device. The receiving device (1820) may include a signal restorer for restoring the received signal to a baseband signal, a multiplexer for combining and multiplexing the received and processed signals, and a channel demodulator for demodulating the multiplexed signal sequence into a corresponding codeword. The signal restorer, the multiplexer, and the channel demodulator may be configured as an integrated module performing their functions or as individual modules. More specifically, the signal restorer may include an analog-to-digital converter (ADC) that converts an analog signal into a digital signal, a CP remover that removes a CP from the digital signal, an FFT module that applies an FFT (fast Fourier transform) to a signal from which the CP has been removed to output a frequency domain symbol, and a resource element demapper / equalizer that restores the frequency domain symbol to an antenna-specific symbol. The antenna-specific symbol is restored to a transmission layer by a multiplexer, and the transmission layer is restored to a codeword that the transmitter intended to transmit by a channel demodulator.

[0559] FIG. 23 illustrates an example of a wireless communication device according to an implementation example of the present disclosure.

[0560] Referring to FIG. 23, a wireless communication device, for example, a terminal, may include at least one of a processor (2310) such as a digital signal processor (DSP) or a microprocessor, a transceiver (2335), a power management module (2305), an antenna (2340), a battery (2355), a display (2315), a keypad (2320), a global positioning system (GPS) chip (2360), a sensor (2365), a memory (2330), a subscriber identification module (SIM) card (2325), a speaker (2345), and a microphone (2350). There may be a plurality of antennas and processors.

[0561] The processor (2310) can implement the functions, procedures, and methods described in this specification. The processor (2310) of FIG. 23 may be the processor (102, 202) of FIG. 19.

[0562] Memory (2330) is connected to the processor (2310) and stores information related to the processor's operation. The memory may be located internally or externally to the processor and may be connected to the processor via various technologies, such as wired or wireless connections. The memory (2330) of FIG. 23 may be the memory (104, 204) of FIG. 19.

[0563] A user may input various types of information, such as a phone number, using various techniques, such as pressing buttons on a keypad (2320) or activating sound using a microphone (2350). The processor (2310) may receive and process the user's information and perform an appropriate function, such as dialing the entered phone number. In some scenarios, data may be retrieved from a SIM card (2325) or memory (2330) to perform the appropriate function. In some scenarios, the processor (2310) may display various types of information and data on a display (2315) for the user's convenience.

[0564] A transceiver (2335) is coupled to a processor (2310) and transmits and / or receives wireless signals, such as radio frequency (RF) signals. The processor may control the transceiver to initiate communication or transmit wireless signals containing various types of information or data, such as voice communication data. The transceiver includes a transmitter and a receiver for transmitting and receiving wireless signals. An antenna (2340) may facilitate the transmission and reception of wireless signals. In some implementations, upon receiving a wireless signal, the transceiver may forward and convert the signal to a baseband frequency for processing by the processor. The processed signal may be processed by various techniques, such as being converted into audible or readable information for output through a speaker (2345). The transceiver of FIG. 23 may be the transceiver (106, 206) of FIG. 19.

[0565] Although not shown in FIG. 23, various components, such as a camera and a Universal Serial Bus (USB) port, may be additionally included in the terminal. For example, the camera may be connected to the processor (2310).

[0566] Fig. 23 is only one implementation example for a terminal, and the implementation examples are not limited thereto. The terminal does not necessarily have to include all the elements of Fig. 23. For example, some components, such as a keypad (2320), a Global Positioning System (GPS) chip (2360), a sensor (2365), and a SIM card (2325), may not be essential elements, and in this case, may not be included in the terminal.

[0567] Fig. 24 illustrates a communication system (1) applicable to this specification.

[0568] Referring to FIG. 24, a communication system (1) applied to the present specification includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using a wireless access technology (e.g., 5G NR (New RAT), LTE (Long Term Evolution)) and may be referred to as a communication / wireless / 5G device. Although not limited thereto, the wireless device may include a robot (100a), a vehicle (100b-1, 100b-2), an XR (eXtended Reality) device (100c), a hand-held device (100d), a home appliance (100e), an IoT (Internet of Things) device (100f), and an AI device / server (400). For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing vehicle-to-vehicle communication, etc. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices, and can be implemented in the form of HMD (Head-Mounted Device), HUD (Head-Up Display) installed in a vehicle, television, smartphone, computer, wearable device, home appliance, digital signage, vehicle, robot, etc. Mobile devices can include smartphone, smart pad, wearable device (e.g., smart watch, smart glass), computer (e.g., laptop, etc.), etc. Home appliances can include TV, refrigerator, washing machine, etc. IoT devices can include sensors, smart meters, etc. For example, base stations and networks can also be implemented as wireless devices, and a specific wireless device (200a) can act as a base station / network node to other wireless devices.

[0569] Wireless devices (100a to 100f) can be connected to a network (300) via a base station (200). Artificial Intelligence (AI) technology can be applied to the wireless devices (100a to 100f), and the wireless devices (100a to 100f) can be connected to an AI server (400) via the network (300). The network (300) can be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, etc. The wireless devices (100a to 100f) can communicate with each other via the base station (200) / network (300), but can also communicate directly (e.g., sidelink communication) without going through the base station / network. For example, vehicles (100b-1, 100b-2) can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to Everything) communication). In addition, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices (100a to 100f).

[0570] Wireless communication / connection (150a, 150b, 150c) can be established between wireless devices (100a~100f) / base stations (200), and base stations (200) / base stations (200). Here, wireless communication / connection can be achieved through various wireless access technologies (e.g., 5G NR) such as uplink / downlink communication (150a), sidelink communication (150b) (or, D2D communication), and communication between base stations (150c) (e.g., relay, IAB (Integrated Access Backhaul). Through wireless communication / connection (150a, 150b, 150c), wireless devices and base stations / wireless devices, and base stations and base stations can transmit / receive wireless signals to each other. For example, wireless communication / connection (150a, 150b, 150c) can transmit / receive signals through various physical channels. To this end, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes can be performed based on various proposals of the present specification.

[0571] Meanwhile, NR supports multiple numerologies (or subcarrier spacing (SCS)) to support various 5G services. For example, an SCS of 15 kHz supports a wide area in traditional cellular bands; an SCS of 30 kHz / 60 kHz supports dense urban areas, lower latency, and wider carrier bandwidth; and an SCS of 60 kHz or higher supports a bandwidth greater than 24.25 GHz to overcome phase noise.

[0572] The NR frequency band can be defined by two types of frequency ranges (FR1, FR2). The numerical values ​​of the frequency ranges can be changed, and for example, the frequency ranges of the two types (FR1, FR2) can be as shown in Table 9 below. For convenience of explanation, among the frequency ranges used in the NR system, FR1 can mean the "sub 6 GHz range", and FR2 can mean the "above 6 GHz range" and can be called millimeter wave (mmW).

[0573] [Table 9]

[0574]

[0575] As described above, the numerical value of the frequency range of the NR system can be changed. For example, FR1 may include a band from 410 MHz to 7125 MHz, as shown in Table 10 below. For example, FR1 may include a frequency band above 6 GHz (or 5850, 5900, 5925 MHz, etc.). For example, the frequency band above 6 GHz (or 5850, 5900, 5925 MHz, etc.) included within FR1 may include an unlicensed band. The unlicensed band may be used for various purposes, such as for vehicle communications (e.g., autonomous driving).

[0576] [Table 10]

[0577]

[0578] The claims set forth in this specification may be combined in various ways. For example, the technical features of the method claims of this specification may be combined and implemented as a device, and the technical features of the device claims of this specification may be combined and implemented as a method. Furthermore, the technical features of the method claims and the technical features of the device claims of this specification may be combined and implemented as a device, and the technical features of the method claims and the technical features of the device claims of this specification may be combined and implemented as a method.

Claims

1. In the method, The terminal receives downlink control information (DCI) scheduling multiple transport blocks from the base station through a control channel, and The terminal receives the plurality of transmission blocks from the base station through a shared channel, The terminal receives multiplexing information from the base station that indicates a multiplexing method of the plurality of transmission blocks in the shared channel, A method characterized in that the terminal applies the fields of the DCI based on the multiplexing information.

2. A method according to claim 1, characterized in that the multiplexing information is received through at least one of an RRC (radio resource control) information element (IE), a MAC CE (medium access control control element), and the DCI.

3. A method according to claim 1, wherein, when the plurality of transport blocks are two transport blocks, the spatial resource information provided by the DCI for one of the two transport blocks is equally applied to the other transport block.

4. A method according to claim 1, characterized in that the multiplexing method is any one of frequency division multiplexing (FDM), time division multiplexing (TDM), and spatial division multiplexing (SDM).

5. A method characterized in that, in the first paragraph, the antenna port field included in the DCI is interpreted differently in cases where the multiplexing method is i) FDM or TDM and ii) SDM.

6. In the first paragraph, when the plurality of transmission blocks are two transmission blocks, a method characterized in that the two transmission blocks are received through two time resources determined based on one TDRA (time domain resource allocation) value and a boundary value included in the DCI.

7. In the first paragraph, when the plurality of transmission blocks are two transmission blocks, a method characterized in that the two transmission blocks are received through two time resources determined based on one TDRA value and offset included in the DCI.

8. In the first paragraph, when the plurality of transmission blocks are two transmission blocks, a method characterized in that the two transmission blocks are received through two frequency resources determined based on one FDRA value and a boundary value included in the DCI.

9. A method according to claim 1, wherein the control channel is a physical downlink control channel (PDCCH) and the shared channel is a physical downlink shared channel (PDSCH).

10. The terminal is, At least one transceiver; At least one memory; and At least one processor operably coupled with said at least one memory and said at least one transceiver, wherein said at least one memory comprises instructions that are executed by said at least one processor to perform operations, The above actions are, Receive downlink control information (DCI) scheduling multiple transport blocks from a base station through a control channel, and Including receiving the plurality of transmission blocks from the base station through a shared channel, Receive multiplexing information from the base station that indicates a multiplexing method of the plurality of transmission blocks in the shared channel, A terminal characterized in that the fields of the DCI are applied based on the above multiplexing information.

11. A terminal according to claim 10, characterized in that the multiplexing information is received through at least one of an RRC (radio resource control) information element (IE), a MAC CE (medium access control control element), and the DCI.

12. A terminal characterized in that, in the 10th paragraph, when the plurality of transmission blocks are two transmission blocks, the spatial resource information provided by the DCI for one of the two transmission blocks is equally applied to the other transmission block.

13. A terminal according to claim 10, wherein the multiplexing method is any one of frequency division multiplexing (FDM), time division multiplexing (TDM), and spatial division multiplexing (SDM).

14. A terminal characterized in that, in the 10th paragraph, the antenna port field included in the DCI is interpreted differently in cases where the multiplexing method is i) FDM or TDM and ii) SDM.

15. In the 10th paragraph, when the plurality of transmission blocks are two transmission blocks, a terminal characterized in that the two transmission blocks are received through two time resources determined based on one TDRA (time domain resource allocation) value and a boundary value included in the DCI.

16. In the 10th paragraph, when the plurality of transmission blocks are two transmission blocks, a terminal characterized in that the two transmission blocks are received through two time resources determined based on one TDRA value and offset included in the DCI.

17. In the 10th paragraph, when the plurality of transmission blocks are two transmission blocks, a terminal characterized in that the two transmission blocks are received through two frequency resources determined based on one FDRA value and a boundary value included in the DCI.

18. A terminal according to claim 10, wherein the control channel is a physical downlink control channel (PDCCH) and the shared channel is a physical downlink shared channel (PDSCH).

19. The device, At least one memory; and At least one processor operably coupled to at least one memory, wherein said at least one memory comprises instructions that are executed by said at least one processor to perform operations, The above actions are, Receive downlink control information (DCI) scheduling multiple transport blocks from a base station through a control channel, and Including receiving the plurality of transmission blocks from the base station through a shared channel, Receive multiplexing information from the base station that indicates a multiplexing method of the plurality of transmission blocks in the shared channel, A device characterized in that it applies fields of the DCI based on the above multiplexing information.

20. At least one computer readable medium (CRM) containing instructions based on being executed by at least one processor, An operation of receiving downlink control information (DCI) scheduling multiple transport blocks from a base station through a control channel, and An operation of receiving the plurality of transmission blocks from the base station through a shared channel, Receive multiplexing information from the base station that indicates a multiplexing method of the plurality of transmission blocks in the shared channel, A CRM characterized in that the fields of the DCI are applied based on the above multiplexing information.

21. In the method, The base station transmits downlink control information (DCI) that schedules multiple transport blocks to the terminal through a control channel, and The base station transmits the plurality of transmission blocks to the terminal through a shared channel, The base station provides the terminal with multiplexing information indicating a multiplexing method of the plurality of transmission blocks in the shared channel, A method characterized in that the fields of the above DCI are interpreted based on the above multiplexing information.

22. The base station, At least one transceiver; At least one memory; and At least one processor operably coupled with said at least one memory and said at least one transceiver, wherein said at least one memory comprises instructions that are executed by said at least one processor to perform operations, The above actions are, Transmitting downlink control information (DCI) that schedules multiple transport blocks to the terminal through a control channel, and Including transmitting the plurality of transmission blocks to the terminal through a shared channel, Provide multiplexing information to the terminal, which indicates a multiplexing method of the plurality of transmission blocks in the shared channel; A base station, characterized in that the fields of the above DCI are interpreted based on the above multiplexing information.

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