Method and base station for sending downlink control information, and user equipment, equipment and storage medium for receiving downlink control information

Abstract

A base station and a user equipment may determine whether to determine a starting symbol value representing a starting symbol of a physical downlink shared channel (PDSCH) based on a reference point different from the start of a time slot allocated for a PDSCH of the cell based on a subcarrier spacing of a cell and a subcarrier spacing of a scheduling cell of the cell. The base station / user equipment may transmit / receive DCI including symbol information about a starting symbol value of the PDSCH through the scheduling cell based on the determination.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system. Background Art

[0002] Various technologies such as machine-to-machine (M2M) communication, machine-type communication (MTC), and various devices requiring high data throughput (e.g., smart phones and tablet personal computers (PCs)) have emerged and become popular. Therefore, the data throughput required to be processed in cellular networks has increased rapidly. In order to meet this rapidly increasing data throughput, carrier aggregation technology or cognitive radio technology for effectively using more frequency bands and multiple input multiple output (MIMO) technology or multiple base station (BS) cooperation technology for increasing the data capacity transmitted on limited frequency resources have been developed.

[0003] As more and more communication devices require greater communication capacity, enhanced mobile broadband (eMBB) communication is needed relative to traditional radio access technology (RAT). In addition, massive machine type communication (mMTC), which provides various services anytime and anywhere by connecting multiple devices and objects to each other, is a major issue to be considered in next-generation communications.

[0004] Discussions are also underway to design communication systems that take into account services / user equipment (UE) that are sensitive to reliability and latency. Discussions are also underway to introduce next generation RATs that take into account eMBB communications, mMTC, ultra-reliable low latency communications (URLLC), etc. Summary of the invention

[0005] Technical issues

[0006] With the introduction of new radio communication technologies, the number of UEs that the BS should provide services to in a specified resource area is increasing, and the amount of data and control information sent / received by the BS to / from the UEs provided services by the BS is also increasing. Since the amount of resources that the BS can use to communicate with the UE is limited, a new method for the BS to effectively receive / send uplink / downlink data and / or uplink / downlink control information using limited radio resources is needed. In other words, due to the increase in the density of nodes and / or the density of UEs, a method for effectively using high-density nodes or high-density UEs for communication is needed.

[0007] There is also a need for a method of efficiently supporting various services with different requirements in a wireless communication system.

[0008] For applications whose performance is sensitive to latency / delay, overcoming latency or delay is a significant challenge.

[0009] The objects to be achieved by using the present disclosure are not limited to those specifically described above, and other objects not described herein will be more clearly understood by those skilled in the art from the following detailed description.

[0010] Technical Solution

[0011] According to one aspect of the present disclosure, a method for transmitting downlink control information (DCI) by a base station in a wireless communication system is provided. The method includes the following steps: determining whether to determine a starting symbol value representing a starting symbol of a physical downlink shared channel (PDSCH) of the cell based on a reference point different from the start of a time slot allocated for the PDSCH of the cell based on a subcarrier spacing of the cell and a subcarrier spacing of a scheduling cell of the cell; and transmitting DCI including symbol information about the starting symbol value of the PDSCH through the scheduling cell based on the determination.

[0012] According to one aspect of the present disclosure, a base station for transmitting downlink control information (DCI) in a wireless communication system is provided. The base station includes at least one transceiver, at least one processor, and at least one computer memory operatively connectable to the at least one processor and storing instructions, wherein the instructions, when executed, cause the at least one processor to perform operations. The operations include: determining whether to determine the starting symbol value of the starting symbol of the physical downlink shared channel (PDSCH) of the cell based on the subcarrier spacing of the cell and the subcarrier spacing of the scheduling cell of the cell based on a reference point different from the start of the time slot allocated for the PDSCH of the cell; and transmitting DCI including symbol information about the starting symbol value of the PDSCH through the scheduling cell based on the determination.

[0013] In various aspects of the present disclosure, determining the starting symbol value based on the reference point may include: determining the starting symbol value of the PDSCH based on the reference point based on a subcarrier spacing of the cell being equal to a subcarrier spacing of the scheduling cell.

[0014] In various aspects of the present disclosure, determining the starting symbol value based on the reference point may include: sending information notifying application of the reference point based on a subcarrier spacing of the cell being equal to a subcarrier spacing of the scheduling cell.

[0015] In various aspects of the present disclosure, the reference point may be the start of a physical uplink control channel (PDCCH) monitoring opportunity at which DCI is transmitted.

[0016] In various aspects of the present disclosure, determining whether to determine the starting symbol value based on the reference point can be performed only for DCI format 1_2.

[0017] In various aspects of the present disclosure, the symbol information may be time domain resource allocation information about a slot length indicator value (SLIV) indicating a start symbol and the number of symbols.

[0018] In various aspects of the present disclosure, determining the starting symbol value based on the reference point may include: determining the starting symbol value of the PDSCH based on the start of the time slot allocated for the PDSCH, based on the subcarrier spacing of the cell being less than the subcarrier spacing of the scheduling cell.

[0019] In various aspects of the present disclosure, the operations may include: sending information indicating an application reference point based on a subcarrier spacing of the cell being smaller than a subcarrier spacing of a scheduling cell.

[0020] According to another aspect of the present disclosure, a method for receiving downlink control information (DCI) by a user equipment in a wireless communication system is provided. The method includes the following steps: receiving a DCI including symbol information about a start symbol value representing a start symbol of a physical downlink shared channel (PDSCH) of the cell on a scheduling cell of the cell; determining whether to apply the start symbol value based on a reference point different from the start of a time slot allocated for the PDSCH based on the subcarrier spacing of the cell and the subcarrier spacing of the scheduling cell; and determining the start symbol of the PDSCH based on the determination and the start symbol value.

[0021] According to another aspect of the present disclosure, a user equipment for receiving downlink control information (DCI) in a wireless communication system is provided. The user equipment includes at least one transceiver, at least one processor, and at least one computer memory operatively connectable to the at least one processor and storing instructions, wherein the instructions, when executed, cause the at least one processor to perform operations. The operations include: receiving a DCI including symbol information about a start symbol value representing a start symbol of a physical downlink shared channel (PDSCH) of the cell on a scheduling cell of the cell; determining whether to apply the start symbol value based on a reference point different from the start of a time slot allocated for the PDSCH based on the subcarrier spacing of the cell and the subcarrier spacing of the scheduling cell; and determining the start symbol of the PDSCH based on the determination and the start symbol value.

[0022] According to another aspect of the present disclosure, a device for user equipment is provided. The device includes at least one processor and at least one computer memory operatively connectable to the at least one processor and storing instructions, wherein the instructions, when executed, cause the at least one processor to perform operations. The operations include: receiving downlink control information (DCI) including symbol information about a starting symbol value representing a starting symbol of a physical downlink shared channel (PDSCH) of the cell on a scheduling cell of the cell; determining whether to apply the starting symbol value based on a reference point different from the start of a time slot allocated for the PDSCH based on the subcarrier spacing of the cell and the subcarrier spacing of the scheduling cell; and determining the starting symbol of the PDSCH based on the determination and the starting symbol value.

[0023] According to another aspect of the present disclosure, a computer-readable storage medium is provided. The computer-readable storage medium stores at least one computer program including instructions, which, when executed by at least one processor, causes the at least one processor to perform operations for a UE. The operations include: receiving downlink control information (DCI) including symbol information about a starting symbol value representing a starting symbol of a physical downlink shared channel (PDSCH) of a cell on a scheduling cell of a cell; determining whether to apply a starting symbol value based on a reference point different from the start of a time slot allocated for the PDSCH based on the subcarrier spacing of the cell and the subcarrier spacing of the scheduling cell; and determining the starting symbol of the PDSCH based on the determination and the starting symbol value.

[0024] In various aspects of the present disclosure, determining whether to apply the start symbol value based on the reference point may include: applying the symbol information based on the reference point based on a subcarrier spacing of the cell being equal to a subcarrier spacing of the scheduling cell.

[0025] In various aspects of the present disclosure, determining whether to apply a start symbol value based on a reference point may further include: receiving information notifying application of a reference point based on a subcarrier spacing of a cell being equal to a subcarrier spacing of a scheduling cell.

[0026] In various aspects of the present disclosure, the reference point may be the start of a physical uplink control channel (PDCCH) monitoring opportunity at which DCI is transmitted.

[0027] In various aspects of the present disclosure, determining whether to determine the starting symbol value based on the reference point can be performed only for DCI format 1_2.

[0028] In various aspects of the present disclosure, determining a starting symbol of a PDSCH may include:

[0029] Based on the subcarrier spacing of the cell being smaller than the subcarrier spacing of the scheduling cell, the starting symbol value is applied based on the beginning of the time slot allocated for the PDSCH.

[0030] In various aspects of the present disclosure, the operation may include: based on a subcarrier spacing of the cell being smaller than a subcarrier spacing of the scheduling cell, not receiving information indicating an application reference point.

[0031] The above solutions are only some examples of the present disclosure, and those skilled in the art can deduce and understand various examples into which the technical features of the present disclosure are incorporated from the following detailed description.

[0032] Beneficial Effects

[0033] According to the implementation of the present disclosure, wireless communication signals can be effectively sent / received, and thus the overall throughput of the wireless communication system can be improved.

[0034] According to implementations of the present disclosure, various services with different requirements can be effectively supported in a wireless communication system.

[0035] According to implementations of the present disclosure, delay / latency generated during radio communications between communication devices may be reduced.

[0036] Effects according to the present disclosure are not limited to those specifically described above, and other effects not described herein will be more clearly understood by those skilled in the art to which the present disclosure relates from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are included to provide a further understanding of the present disclosure, and illustrate examples of implementations of the present disclosure and together with the detailed description serve to explain the implementations of the present disclosure:

[0038] Figure 1 An example of a communication system 1 to which an implementation of the present disclosure is applied is shown;

[0039] Figure 2 is a block diagram illustrating an example of a communication device capable of executing the method according to the present disclosure;

[0040] Figure 3 Another example of a wireless device capable of performing implementations of the present disclosure is shown;

[0041] Figure 4 An example of a frame structure used in a wireless communication system based on the 3rd Generation Partnership Project (3GPP) is shown;

[0042] Figure 5 a resource grid showing time slots;

[0043] Figure 6 Shows the time slot structure available in a 3GPP based system;

[0044] Figure 7 An example of PDSCH time domain resource allocation (TDRA) caused by PDCCH and an example of PUSCH TDRA caused by PDCCH are shown;

[0045] Figure 8 A hybrid automatic repeat request-acknowledgement (HARQ-ACK) transmission / reception process is shown;

[0046] Fig. 9 An example of multiplexing uplink control information (UCI) with PUSCH is shown;

[0047] Fig.10 An example of a process for a UE to handle collisions between uplink (UL) channels with overlapping physical uplink control channels (PUCCH) in a single time slot is shown;

[0048] Fig.11 Shown based on Fig.12 The case where UCI multiplexing is performed;

[0049] Fig.12 shows the handling of conflicts between UL channels by a user equipment (UE) with overlapping PUCCH and PUSCH in a single slot;

[0050] Fig.13 shows UCI multiplexing considering timeline conditions;

[0051] Fig.14 shows the transmission of multiple HARQ-ACK PUCCHs in a time slot;

[0052] Fig.15 showing a plurality of transmissions scheduled in a time slot;

[0053] Fig.16 and Fig.17 An example of a DCI transmission / reception process according to some implementations of the present disclosure is shown. DETAILED DESCRIPTION

[0054] Hereinafter, implementations according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description given below with reference to the accompanying drawings is intended to illustrate exemplary implementations of the present disclosure, rather than to show the only implementations that can be implemented according to the present disclosure. The following detailed description includes specific details in order to provide a thorough understanding of the present disclosure. However, it will be apparent to those skilled in the art that the present disclosure can be practiced without these specific details.

[0055] In some cases, known structures and devices may be omitted or may be shown in block diagram form, thereby focusing on important features of the structures and devices so as not to obscure the concepts of the present disclosure. The same reference numerals will be used throughout the present disclosure to refer to the same or similar parts.

[0056] The following techniques, devices and systems can be applied to various wireless multiple access systems. For example, multiple access systems may include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, multi-carrier frequency division multiple access (MC-FDMA) systems, etc. CDMA can be implemented by radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented by radio technologies such as Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), Enhanced Data Rate for GSM Evolution (EDGE) (i.e., GERAN), etc. OFDMA can be specifically implemented by radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. UTRA is part of Universal Mobile Telecommunications System (UMTS), and 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of E-UMTS using E-UTRA. 3GPP LTE adopts OFDMA on downlink (DL) and SC-FDMA on uplink (UL). LTE-advanced (LTE-A) is an evolved version of 3GPP LTE.

[0057] For the convenience of description, the description will be given under the assumption that the present disclosure is applied to LTE and / or new RAT (NR). However, the technical features of the present disclosure are not limited thereto. For example, although the following detailed description is given based on a mobile communication system corresponding to a 3GPP LTE / NR system, the mobile communication system is applicable to any other mobile communication system except for matters specific to the 3GPP LTE / NR system.

[0058] For terms and techniques used in the present disclosure that are not described in detail, reference may be made to 3GPP LTE standard specifications (e.g., 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321, 3GPP TS 36.300, 3GPP TS 36.331, etc.) and 3GPP NR standard specifications (e.g., 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.214, 3GPP TS 38.300, 3GPP TS 38.331, etc.).

[0059] In an example of the present disclosure described later, if a device "assumes" something, this may mean that a channel transmission entity transmits a channel in accordance with the corresponding "assumption". This may also mean that a channel reception entity receives or decodes a channel in a form that conforms to the "assumption" under the premise that the channel is transmitted in accordance with the "assumption".

[0060] In the present disclosure, a user equipment (UE) may be fixed or mobile. Each of the various devices that transmit and / or receive user data and / or control information by communicating with a base station (BS) may be a UE. The term UE may be referred to as a terminal device, a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA), a wireless modem, a handheld device, etc. In the present disclosure, a BS refers to a fixed station that communicates with a UE and / or another BS and exchanges data and control information with the UE and another BS. The term BS may be referred to as an advanced base station (ABS), a node B (NB), an evolved node B (eNB), a base transceiver system (BTS), an access point (AP), a processing server (PS), etc. Specifically, a BS of a universal terrestrial radio access (UTRAN) is referred to as an NB, a BS of an evolved UTRAN (E-UTRAN) is referred to as an eNB, and a BS of a new radio access technology network is referred to as a gNB. In the following, for the convenience of description, NB, eNB or gNB will be referred to as a BS regardless of the type or version of the communication technology.

[0061] In the present disclosure, a node refers to a fixed point that can send / receive a radio signal to / from a UE by communicating with the UE. Regardless of its name, various types of BSs can be used as nodes. For example, a BS, NB, eNB, picocell eNB (PeNB), home eNB (HeNB), repeater, transponder, etc. can be a node. In addition, a node may not be a BS. For example, a radio remote head (RRH) or a radio remote unit (RRU) can be a node. Typically, RRH and RRU have a power level lower than that of the BS. Since the RRH or RRU (hereinafter, RRH / RRU) is usually connected to the BS via a dedicated line such as an optical cable, the collaborative communication according to the RRH / RRU and the BS can be smoothly performed compared to the collaborative communication according to the BS connected via a wireless link. At least one antenna is installed per node. The antenna may refer to a physical antenna port or to a virtual antenna or an antenna group. A node may also be referred to as a point.

[0062] In the present disclosure, a cell refers to a specific geographical area where one or more nodes provide communication services. Therefore, in the present disclosure, communication with a specific cell may mean communication with a BS or node that provides communication services to a specific cell. The DL / UL signal of a specific cell refers to the DL / UL signal from / to the BS or node that provides communication services to the specific cell. A cell that provides UL / DL communication services to a UE is particularly referred to as a service cell. In addition, the channel state / quality of a specific cell refers to the channel state / quality of a channel or communication link generated between a BS or node that provides communication services to a specific cell and the UE. In a 3GPP-based communication system, a UE can use a CRS sent on a cell-specific reference signal (CRS) resource and / or a CSI-RS sent on a channel state information reference signal (CSI-RS) resource (allocated to a specific node by an antenna port of a specific node) to measure the DL channel state from a specific node.

[0063] The 3GPP-based communication system uses the concept of a cell in order to manage radio resources, and distinguishes a cell related to radio resources from a cell of a geographical area.

[0064] A "cell" of a geographic area may be understood as a coverage area in which a node can use a carrier to provide services, and a "cell" of radio resources is associated with a bandwidth (BW) which is a frequency range configured by a carrier. Since the DL coverage (the range in which a node can send a valid signal) and the UL coverage (the range in which a node can receive a valid signal from a UE) depend on the carrier that carries the signal, the coverage of a node may also be associated with the coverage of a "cell" of radio resources used by the node. Therefore, the term "cell" may be used to indicate the service coverage of a node at times, to indicate a radio resource at other times, or to indicate a range that a signal using a radio resource can reach with effective strength at other times.

[0065] In the 3GPP communication standard, the concept of a cell is used to manage radio resources. A "cell" associated with a radio resource is defined by a combination of DL resources and UL resources (i.e., a combination of DL component carriers (CCs) and UL CCs). A cell may be configured only by DL resources, or by a combination of DL resources and UL resources. If carrier aggregation is supported, the link between the carrier frequency of a DL resource (or DL ​​CC) and the carrier frequency of a UL resource (or UL CC) may be indicated by system information. For example, the combination of DL resources and UL resources may be indicated by a system information block type 2 (SIB2) link. In this case, the carrier frequency may be equal to or different from the center frequency of each cell or CC. When carrier aggregation (CA) is configured, the UE has only one radio resource control (RRC) connection with the network. During RRC connection establishment / reestablishment / handover, one serving cell provides non-access layer (NAS) mobility information. During RRC connection reestablishment / handover, one serving cell provides security input. The cell is called a primary cell (Pcell). Pcell refers to a cell operating on the primary frequency where the UE performs an initial connection establishment process or initiates a connection reestablishment process. According to the UE capabilities, the secondary cell (Scell) can be configured to form a set of serving cells together with the Pcell. The Scell ​​can be configured after the RRC connection establishment is completed and is used to provide additional radio resources in addition to the resources of the specific cell (SpCell). The carrier corresponding to the Pcell on the DL is called the downlink primary CC (DL PCC), and the carrier corresponding to the Pcell on the UL is called the uplink primary CC (UL PCC). The carrier corresponding to the Scell ​​on the DL is called the downlink secondary CC (DL SCC), and the carrier corresponding to the Scell ​​on the UL is called the uplink secondary CC (UL SCC).

[0066] For dual connectivity (DC) operation, the term SpCell refers to the Pcell of the primary cell group (MCG) or the Pcell of the secondary cell group (SCG). SpCell supports PUCCH transmission and contention-based random access and is always enabled. MCG is a set of serving cells associated with a master node (e.g., BS) and includes SpCell (Pcell) and optionally one or more Scells. For a UE configured with DC, SCG is a subset of the serving cells associated with the secondary node and includes PSCell and 0 or more Scells. For a UE in RRC_CONNECTED state that is not configured with CA or DC, there is only one serving cell that includes only Pcell. For a UE in RRC_CONNECTED state that is configured with CA or DC, the term serving cell refers to a set of cells that includes SpCell and all Scells. In DC, two medium access control (MAC) entities are configured for the UE, i.e., one MAC entity for MCG and one MAC entity for SCG.

[0067] A UE configured with CA but not configured with DC may be configured with a Pcell PUCCH group (including a Pcell and 0 or more Scells) and a Scell ​​PUCCH group (including only Scells). For an Scell, a Scell ​​(hereinafter, a PUCCH cell) that transmits a PUCCH associated with a corresponding cell may be configured. A Scell ​​indicated as a PUCCH Scell ​​belongs to the Scell ​​PUCCH group, and PUCCH transmission of related uplink control information (UCI) is performed on the PUCCH Scell. A Scell ​​not indicated as a PUCCH Scell ​​or indicated that the cell for PUCCH transmission is a Pcell belongs to the Pcell PUCCH group, and PUCCH transmission of related UCI is performed on the Pcell.

[0068] In a wireless communication system, a UE receives information from a BS on DL, and a UE transmits information to a BS on UL. The information transmitted and / or received by the BS and the UE includes data and various control information, and there are various physical channels according to the type / purpose of the information transmitted and / or received by the UE and the BS.

[0069] The communication standards based on 3GPP define DL physical channels corresponding to resource elements carrying information from high layers and DL physical signals corresponding to resource elements used by the physical layer but not carrying information from high layers. For example, physical downlink shared channel (PDSCH), physical broadcast channel (PBCH), physical multicast channel (PMCH), physical control format indicator channel (PCFICH), physical downlink control channel (PDCCH), etc. are defined as DL physical channels, and reference signals (RS) and synchronization signals (SS) are defined as DL physical signals. RS (also called pilot) represents a signal with a predefined special waveform known to both BS and UE. For example, demodulation reference signal (DMRS), channel state information RS (CSI-RS), etc. are defined as DL RS. The communication standards based on 3GPP define UL physical channels corresponding to resource elements carrying information from high layers and UL physical signals corresponding to resource elements used by the physical layer but not carrying information from high layers. For example, a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical random access channel (PRACH) are defined as UL physical channels, and a DMRS for UL control / data signals, a sounding reference signal (SRS) for UL channel measurement, etc. are defined.

[0070] In the present disclosure, PDCCH refers to a set of time-frequency resources (e.g., resource elements) carrying downlink control information (DCI), and PDSCH refers to a set of time-frequency resources carrying DL data. PUCCH, PUSCH, and PRACH refer to a set of time-frequency resources carrying UCI, UL data, and random access signals, respectively. In the following description, "UE sends / receives PUCCH / PUSCH / PRACH" means that the UE sends / receives UCI / UL data / random access signals on or through PUSCH / PUCCH / PRACH, respectively. In addition, "BS sends / receives PBCH / PDCCH / PDSCH" means that the BS sends broadcast information / DL data / DCI on or through PBCH / PDCCH / PDSCH, respectively.

[0071] As more and more communication devices require greater communication capacity, eMBB communication relative to traditional radio access technology (RAT) is needed. In addition, large-scale MTC, which provides various services anytime and anywhere by connecting multiple devices and objects to each other, is a major issue to be considered in the next generation of communications. In addition, the design of communication systems that take into account services / UEs that are sensitive to reliability and delay is also being discussed. Considering eMBB communication, large-scale MTC, ultra-reliable low-latency communication (URLLC), etc., the introduction of the next generation RAT is being discussed. Currently, in 3GPP, research on the next generation mobile communication system after EPC is underway. In this disclosure, for convenience, the corresponding technology is referred to as a new RAT (NR) or a fifth generation (5G) RAT, and a system using NR or supporting NR is referred to as an NR system.

[0072] Figure 1 An example of a communication system 1 to which an implementation of the present disclosure is applied is shown. Figure 1 , the communication system 1 applied to the present disclosure includes a wireless device, a BS, and a network. Here, the wireless device refers to a device that performs communication using a RAT (e.g., 5G NR or LTE (e.g., E-UTRA)), and may be referred to as a communication / radio / 5G device. The wireless device may include (but is not limited to) a robot 100a, a vehicle 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing vehicle-to-vehicle communication. Here, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device, and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a television, a smart phone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, and the like. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, BSs and networks may also be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node relative to another wireless device.

[0073] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS / network. For example, vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0074] Wireless communication / connection 150a and 150b may be established between the wireless devices 100a to 100f and the BS 200, and between the wireless devices 100a to 100f. Here, wireless communication / connection such as UL / DL communication 150a and sidelink communication 150b (or device-to-device (D2D) communication) may be established through various RATs (e.g., 5G NR). The wireless device and the BS / wireless device may send / receive radio signals to / from each other through the wireless communication / connection 150a and 150b. To this end, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and at least a portion of the resource allocation process may be performed based on various proposals of the present disclosure.

[0075] Figure 2 is a block diagram showing an example of a communication device capable of executing the method according to the present disclosure. Figure 2 , the first wireless device 100 and the second wireless device 200 may transmit and / or receive radio signals through various RATs (e.g., LTE and NR). Here, {the first wireless device 100 and the second wireless device 200} may correspond to Figure 1 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0076] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106, and may be configured to implement the functions, processes and / or methods described / proposed above. For example, the processor 102 may process the information in the memory 104 to generate first information / signals, and then transmit a radio signal including the first information / signals through the transceiver 106. The processor 102 may receive a radio signal including second information / signals through the transceiver 106, and then store information obtained by processing the second information / signals in the memory 104. The memory 104 may be connected to the processor 102, and may store various information related to the operation of the processor 102. For example, the memory 104 may execute part or all of the processes controlled by the processor 102 or store software codes including commands for executing the processes and / or methods described / proposed above. Here, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive radio signals through one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0077] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206, and may be configured to implement the functions, processes and / or methods described / proposed above. For example, the processor 202 may process the information in the memory 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the transceiver 206. The processor 202 may receive a radio signal including fourth information / signals through the transceiver 206, and then store information obtained by processing the fourth information / signals in the memory 204. The memory 204 may be connected to the processor 202, and may store various information related to the operation of the processor 202. For example, the memory 204 may execute part or all of the processes controlled by the processor 202 or store software codes including commands for executing the processes and / or methods described / proposed above. Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive radio signals through one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0078] In the following, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by (but not limited to) one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, and a service data adaptation protocol (SDAP) layer). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the functions, procedures, proposals, and / or methods disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this document. One or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this document, and provide the generated signal to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this document.

[0079] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The functions, processes, proposals, and / or methods disclosed in the document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to perform the functions, processes, proposals, and / or methods disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204 to be driven by one or more processors 102 and 202. The functions, processes, proposals and / or methods disclosed in this document may be implemented in the form of codes, commands and / or command sets using firmware or software.

[0080] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, commands and / or instructions. One or more memories 104 and 204 may be configured by read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard disk drive, register, cache memory, computer-readable storage medium and / or a combination thereof. One or more memories 104 and 204 may be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 by various technologies such as wired or wireless connections.

[0081] One or more transceivers 106 and 206 may send user data, control information and / or radio signals / channels mentioned in the method and / or operation flow chart of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information and / or radio signals / channels mentioned in the function, process, proposal, method and / or operation flow chart disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and send and receive radio signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may send user data, control information or radio signals to one or more other devices. One or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may receive user data, control information or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208. One or more transceivers 106 and 206 may be configured to send and receive user data, control information and / or radio signals / channels mentioned in the functional, process, proposal, method and / or operation flow chart disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc. from RF band signals to baseband signals so as to process received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0082] Figure 3 Another example of a wireless device capable of executing implementations of the present disclosure is shown. Figure 3 , the wireless devices 100 and 200 may correspond to Figure 2 The wireless devices 100 and 200 of the present invention may be configured by various elements, components, units / parts and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130 and an additional component 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include Figure 2One or more processors 102 and 202 and / or one or more memories 104 and 204. For example, the transceiver 114 may include Figure 2 The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit 130. The control unit 120 may send information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 in the memory unit 130 through a wireless / wired interface.

[0083] The additional components 140 may be configured differently depending on the type of wireless device. For example, the additional components 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured in the form of, but not limited to, a robot ( Figure 1 100a), vehicles ( Figure 1 100b-1 and 100b-2), XR devices ( Figure 1 100c), handheld device ( Figure 1 100d), household appliances ( Figure 1 100e), IoT devices ( Figure 1 100f), digital broadcast UE, holographic device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Figure 1 400), BS( Figure 1 200), network nodes, etc. The wireless device can be used in a mobile or fixed location depending on the usage / service.

[0084] exist Figure 3In the wireless devices 100 and 200, various elements, components, units / parts and / or modules in the wireless devices 100 and 200 may all be connected to each other through a wired interface, or at least a part thereof may be wirelessly connected through the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be wired, and the control unit 120 and the first unit (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. The various elements, components, units / parts and / or modules within the wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured by a collection of one or more processors. As an example, the control unit 120 may be configured by a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit and a memory control processor. As another example, the memory 130 may be configured by a random access memory (RAM), a dynamic RAM (DRAM), a read-only memory (ROM)), a flash memory, a volatile memory, a non-volatile memory and / or a combination thereof.

[0085] In the present disclosure, at least one memory (e.g., 104 or 204) may store instructions or programs, which when executed cause at least one processor operatively connected to the at least one memory to perform operations according to some embodiments or implementations of the present disclosure.

[0086] In the present disclosure, a computer-readable storage medium may store at least one instruction or a computer program, which, when executed by at least one processor, causes the at least one processor to perform operations according to some embodiments or implementations of the present disclosure.

[0087] In the present disclosure, a processing device or apparatus may include at least one processor and at least one computer memory coupled to the at least one memory. The at least one computer memory may store instructions or programs that, when executed, cause at least one processor operatively coupled to the at least one memory to perform operations according to some embodiments or implementations of the present disclosure.

[0088] The communication device of the present disclosure includes: at least one processor; and at least one computer memory, which is operatively connected to the at least one processor and configured to store instructions, which when executed cause the at least one processor to perform operations according to examples of the present disclosure described later.

[0089] Figure 4 An example of a frame structure used in a 3GPP-based wireless communication system is shown.

[0090] Figure 4The frame structure is only exemplary, and the number of subframes, the number of time slots, and the number of symbols in the frame may be changed differently. In the NR system, different OFDM parameter sets (e.g., subcarrier spacing (SCS)) may be configured for multiple cells aggregated for one UE. Therefore, the (absolute time) duration of time resources including the same number of symbols (e.g., subframes, time slots, or transmission time intervals (TTIs)) may be configured differently for the aggregated cells. Here, the symbol may include an OFDM symbol (or a cyclic prefix-OFDM (CP-OFDM) symbol) and an SC-FDMA symbol (or a discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbol). In the present disclosure, symbols, OFDM-based symbols, OFDM symbols, CP-OFDM symbols, and DFT-s-OFDM symbols may be used interchangeably.

[0091] Reference Figure 4 In the NR system, UL transmission and DL transmission are organized into frames. Each half-frame consists of 5 subframes, and the duration of a single subframe is T sf The subframe is further divided into slots, and the number of slots in a subframe depends on the subcarrier spacing. Each slot includes 14 or 12 OFDM symbols based on the cyclic prefix. In normal CP, each slot includes 14 OFDM symbols, and in extended CP, each slot includes 12 OFDM symbols. The parameter set depends on the exponentially scalable subcarrier spacing Δf=2 u *15kHz. The following table shows the number of OFDM symbols per time slot (N slot symb ), the number of time slots per frame (N frame ，u slot ) and the number of time slots per subframe (N subframe，u slot ).

[0092] [Table 1]

[0093] u <![CDATA[N slot symb ]]> <![CDATA[N frame，u slot ]]> <![CDATA[N subframe，u slot ]]> 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

[0094] The following table shows the subcarrier spacing Δf = 2 u *15kHz, number of OFDM symbols per slot, number of slots per frame and number of slots per subframe.

[0095] [Table 2]

[0096] u <![CDATA[N slot symb ]]> <![CDATA[N frame，u slot ]]> <![CDATA[N subframe，u slot ]]> 2 12 40 4

[0097] Figure 5A resource grid of a time slot is shown. A time slot includes multiple (e.g., 14 or 12) symbols in the time domain. For each parameter set (e.g., subcarrier spacing) and carrier, a common resource block (CRB) N is indicated by higher layer signaling (e.g., RRC signaling). start，u grid Begins to define N size，u grid，x *N RB sc subcarriers and N subframe，u symb OFDM symbol resource grid, where N size，u grid，x is the number of resource blocks (RBs) in the resource grid, and the subscript x is DL for the downlink and UL for the uplink. N RB sc is the number of subcarriers per RB. In 3GPP-based wireless communication systems, N RB sc Typically 12. For a given antenna port p, subcarrier spacing configuration u, and transmission link (DL or UL), there is one resource grid. The carrier bandwidth N for subcarrier spacing configuration u is given to the UE through higher-layer parameters (e.g., RRC parameters) size，u grid . Each element in the resource grid for antenna port p and subcarrier spacing configuration u is called a resource element (RE), and one complex symbol can be mapped to each RE. Each RE in the resource grid is uniquely identified by an index k in the frequency domain and an index l representing the symbol position relative to a reference point in the time domain. In the NR system, an RB is defined by 12 consecutive subcarriers in the frequency domain. In the NR system, RBs are classified into CRBs and physical resource blocks (PRBs). For subcarrier spacing configuration u, CRBs are numbered from 0 upwards in the frequency domain. The center of subcarrier 0 of CRB 0 of subcarrier spacing configuration u is equal to "point A" used as a common reference point for the RB grid. The PRBs are defined within a bandwidth part (BWP) and are numbered from 0 to N. size BwP，i -1 numbering, where i is the number of BWPs. PRB n in BWP i pRB With CRB nCRB The relationship between n PRB =n CRB +N size BWP,i Given, where N size BWP,iis the CRB where the BWP starts relative to CRB 0. A BWP includes multiple consecutive RBs in the frequency domain. A carrier may include up to N (e.g., 5) BWPs. A UE may be configured with one or more BWPs on a given component carrier. Data communication is performed through enabled BWPs, and only a predetermined number of BWPs (e.g., one BWP) among the BWPs configured for the UE may be active on the component carrier.

[0098] Figure 6 is a diagram showing an exemplary time slot structure that can be used in a 3GPP-based system. In each 3GPP-based system (e.g., an NR system), each time slot may have a self-contained structure having i) a DL control channel, ii) DL or UL data, and / or iii) a UL control channel. For example, the first N symbols of a time slot may be used to transmit a DL control channel (hereinafter referred to as a DL control region), and the last M symbols of a time slot may be used to transmit a UL control channel (hereinafter referred to as an UL control region). Each of N and M is 0 or a positive integer. The resource region between the DL control region and the UL control region (hereinafter referred to as a data region) may be used to transmit DL data or UL data. The symbols of a single time slot may be divided into groups of consecutive symbols that may be used as DL symbols, UL symbols, or flexible symbols. Hereinafter, information specifying the purpose of symbols in a time slot is referred to as a time slot format. For example, a time slot format may define which symbols are to be used for UL and which symbols are to be used for DL.

[0099] When the serving cell is to operate in TDD mode, the BS may configure the UL and DL allocation patterns for the serving cell through high-layer signaling (e.g., RRC signaling). For example, the following parameters may be used to configure the TDD DL-UL pattern:

[0100] -dl-UL-TransmissionPeriodicity, indicating the periodicity of the DL-UL pattern;

[0101] -nrofDownlinkSlots, indicating the number of consecutive full DL slots at the beginning of each DL-UL pattern, where a full slot is a slot that includes only DL symbols;

[0102] -nrofDownlinkSymbols, indicating the number of consecutive DL symbols at the beginning of the slot after the last full DL slot;

[0103] -nrofUplinkSlots, indicating the number of consecutive full UL slots at the end of each DL-UL pattern, where a full UL slot is a slot that includes only UL symbols; and

[0104] -nrofUplinkSymbols, indicates the number of consecutive UL symbols at the end of the slot before the first full UL slot.

[0105] The remaining symbols among the symbols of the DL-UL pattern that are neither configured as DL nor configured as UL are flexible symbols.

[0106] Upon receiving the configuration of the TDD DL-UL pattern, ie, TDD UL-DL configuration (eg, tdd-UL-DL-ConfigurationCommon or tdd-UL-DLConfigurationDedicated) through higher layer signaling, the UE sets a slot format for each slot across the slots.

[0107] Although various combinations can be generated from DL symbols, UL symbols, and flexible symbols, a specific number of combinations can be predefined as a slot format, and the predefined slot format can be identified by a slot format index. The following table lists some predefined slot formats. In the table, D represents a DL symbol, U represents a UL symbol, and F represents a flexible symbol.

[0108] [Table 3]

[0109]

[0110] In order to indicate which predefined time slot format is to be used for a specific time slot, the BS may configure a set of time slot format combinations that can be used for each service cell in the service cell set through high-level signaling (e.g., RRC signaling), and configure the UE to monitor the group common PDCCH of the time slot format indicator (SFI) through high-level signaling (e.g., RRC signaling). The DCI carried on the group common PDCCH of the SFI is called SFI DCI. DCI format 2_0 is used for SFI DCI. For example, for each service cell in the service cell set, the BS may provide the UE with the (starting) position of the time slot format combination ID (i.e., SFI index) of the service cell, the set of time slot format combinations applicable to the service cell, and the reference SCS configuration of each time slot format in the time slot format combination indicated by the SFI index value in the SFI DCI. For each time slot format combination in the set of time slot format combinations, one or more time slot formats are configured, and a time slot format combination ID (i.e., SFI index) is assigned. For example, when the BS is to configure a slot format combination having N slot formats, the BS may indicate N slot format indices of a predefined slot format (e.g., refer to Table 4) of the slot format combination. In order to configure the group common PDCCH for the UE to monitor the SFI, the BS indicates to the UE the RNTI for the SFI, the SFI-RNTI, and the total length of the DCI payload scrambled with the SFI-RNTI. When the PDCCH is detected based on the SFI-RNTI, the UE may determine the slot format of the corresponding serving cell from the SFI index of the serving cell in the DCI payload of the PDCCH.

[0111] Symbols indicated as flexible by the TDD DL-UL pattern configuration may be indicated as UL, DL or Flexible by the SFI DCI.Symbols indicated as DL / UL by the TDD DL-UL pattern configuration are not overwritten by the SFI DCI as UL / DL or Flexible.

[0112] When the UE is not configured with a TDD DL-UL pattern, the UE determines whether a time slot is used for UL or DL ​​and the symbol allocation in the time slot for each time slot based on the SFI DCI and / or DCI (e.g., DCI format 1_0, DCI format 1_1, DCI format 1_2, DCI format 0_0, DCI format 0_1, DCI format 0_2, and DCI format 2_3) that schedules or triggers DL or UL signal transmission.

[0113] A UE configured with carrier aggregation may be configured to use one or more cells. If the UE is configured with multiple serving cells, the UE may be configured with one or more cell groups. The UE may also be configured with multiple cell groups associated with different BSs. Alternatively, the UE may be configured with multiple cell groups associated with a single BS. Each cell group of the UE includes one or more serving cells and includes a single PUCCH cell configured with PUCCH resources. The PUCCH cell may be a Pcell or Scell ​​configured as a PUCCH cell among the Scells of the corresponding cell group. Each serving cell of the UE belongs to one of the cell groups of the UE, not to multiple cells.

[0114] NR frequency bands are defined as two types of frequency ranges, FR1 and FR2, FR2 is also known as millimeter wave (mmW). The following table shows the frequency ranges in which NR can operate.

[0115] [Table 4]

[0116] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 410MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0117] Hereinafter, physical channels available in a 3GPP-based wireless communication system will be described in detail.

[0118] PDCCH carries DCI. For example, PDCCH (i.e., DCI) carries information about the transmission format and resource allocation of the downlink shared channel (DL-SCH), information about the resource allocation of the uplink shared channel (UL-SCH), paging information about the paging channel (PCH), system information about DL-SCH, information about resource allocation of control messages of a layer higher than the physical layer (hereinafter, high layer) in the protocol stack of UE / BS (e.g., random access response (RAR) sent on PDSCH), transmission power control commands, information about the activation / release of configuration scheduling (CS), etc. DCI including resource allocation information about DL-SCH is called PDSCH scheduling DCI, and DCI including resource allocation information about UL-SCH is called PUSCH scheduling DCI. DCI includes a cyclic redundancy check (CRC). The CRC is masked / scrambled with various identifiers (e.g., radio network temporary identifier (RNTI)) according to the owner and purpose of the PDCCH. For example, if the PDCCH is for a specific UE, the CRS is masked with a UE identifier (e.g., cell-RNTI (C-RNTI)). If the PDCCH is for a paging message, the CRC is masked with a paging RNTI (P-RNTI). If the PDCCH is for system information (e.g., system information block (SIB)), the CRC is masked with a system information RNTI (SI-RNTI). If the PDCCH is for a random access response, the CRC is masked with a random access-RNTI (RA-RNTI).

[0119] If the PDCCH on one serving cell schedules the PDSCH or PUSCH of another serving cell, this is called cross-carrier scheduling. Cross-carrier scheduling using the carrier indicator field (CIF) allows the PDCCH of the serving cell to schedule resources on another serving cell. On the other hand, if the PDSCH on the serving cell schedules the PDSCH or PUSCH of the serving cell, this is called self-carrier scheduling. If cross-carrier scheduling is used on a cell, the BS may provide information about the cell used to schedule the cell using cross-carrier scheduling to the UE. For example, the BS may provide the UE with information about whether the serving cell is scheduled by the PDCCH on another (scheduling) cell or by the serving cell, or which cell signals the DL assignment and UL assignment of the serving cell when the serving cell is scheduled by another (scheduling) cell. In the present disclosure, the cell carrying the PDCCH is referred to as the scheduling cell, and the cell where the PUSCH or PDSCH transmission is scheduled by the DCI included in the PDCCH (i.e., the cell carrying the PUSCH or PDSCH scheduled by the PDCCH) is referred to as the scheduled cell.

[0120] The PDCCH is sent through a control resource set (CORESET). One or more CORESETs can be configured for the UE. A CORESET consists of a set of PRBs with a duration of 1 to 3 OFDM symbols. The PRBs that constitute the CORESET and the CORESET duration can be provided to the UE through high-level (e.g., RRC) signaling. The set of PDCCH candidates in the configured CORESET is monitored according to the corresponding search space set. In the present disclosure, monitoring means decoding each PDCCH candidate according to the monitored DCI format (referred to as blind decoding). The master information block (MIB) on the PBCH provides the UE with parameters (e.g., CORESET#0) for monitoring the PDCCH for scheduling the PDSCH carrying system information block 1 (SIB1). The PBCH may indicate that there is no associated SIB1. In this case, the UE is not only informed that it can assume that there is no frequency range for the SSB associated with SSB1, but also is informed to discover another frequency range for the SSB associated with SIB1. As a CORESET for scheduling at least SIB1, CORESET#0 may be configured through MIB or dedicated RRC signaling.

[0121] The set of PDCCH candidates monitored by the UE is defined according to the PDCCH search space set. The search space set can be a common search space (CSS) set or a UE-specific search space (USS) set. Each CORESET configuration is associated with one or more search space sets, and each search space set is associated with one CORESET configuration. The search space set is determined based on the following parameters provided by the BS to the UE.

[0122] -controlResourceSetId: An indicator used to identify the CORESET associated with the search space set.

[0123] -monitoringSlotPeriodicityAndOffset: used to configure the PDCCH monitoring periodicity and PDCCH monitoring offset of the time slot used for PDCCH monitoring.

[0124] - duration: The number of consecutive slots that the search space lasts in each opportunity, ie, in each period given in monitoringSlotPeriodicityAndOffset.

[0125] - monitoringSymbolsWithinSlot: PDCCH monitoring pattern in a slot, which indicates the first symbol of the CORESET in the slot used for PDCCH monitoring.

[0126] -nrofCandidates: The number of PDCCH candidates per CCE aggregation level.

[0127] The UE monitors PDCCH candidates only in the PDCCH monitoring opportunities. The UE determines the PDCCH monitoring opportunities from the PDCCH monitoring periodicity, PDCCH monitoring offset and PDCCH monitoring pattern in the time slot. For example, the parameter monitoringSymbolsWithinSlot indicates the first symbol used for PDCCH monitoring in the time slot configured for PDCCH monitoring (e.g., reference parameters monitoringSlotPeriodicityAndOffset and duration). For example, if monitoringSymbolsWithinSlot is 14 bits, the bits of monitoringSymbolsWithinSlot may represent the 14 OFDM symbols of the time slot respectively, so that the most significant (left) bit represents the first OFDM symbol in the time slot, and the second most significant (left) bit represents the second OFDM symbol in the time slot. For example, the bit set to 1 among the bits in monitoringSymbolsWithinSlot identifies the first symbol of the CORESET in the time slot.

[0128] The following table shows the search space set, associated RNTI and usage.

[0129] [Table 5]

[0130]

[0131] The following table shows the DCI formats that can be carried by the PDCCH.

[0132] [Table 6]

[0133]

[0134] DCI format 0_0 can be used to schedule transport block (TB)-based (or TB-level) PUSCH, and DCI format 0_1 ​​can be used to schedule TB-based (or TB-level) PUSCH or code block group (CBG)-based (or CBG-level) PUSCH. DCI format 1_0 can be used to schedule TB-based (or TB-level) PDSCH, and DCI format 1_1 can be used to schedule TB-based (or TB-level) PDSCH or CBG-based (or CBG-level) PDSCH. In the case of CSS, after the BWP size is initially given by RRC, DCI format 0_0 and DCI format 1_0 have a fixed size. In the case of USS, in DCI format 0_0 and DCI format 1_0, the size of the field other than the size of the frequency domain resource assignment (FDRA) field has a fixed size, and the size of the FDRA field can be changed by the BS through relevant parameter configuration. In DCI format 0_1 ​​and DCI format 1_1, the size of the DCI field can be changed by the BS through various RRC reconfigurations. DCI format 2_0 may be used to transmit dynamic slot format information (eg, SFI DCI) to the UE, and DCI format 2_1 may be used to transmit DL preemption information to the UE.

[0135] PDSCH is a physical layer UL channel for UL data transmission. PDSCH carries DL data (e.g., DL-SCH transport block) and is subjected to modulation such as quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), 64QAM, 256QAM, etc. Codewords are generated by encoding transport blocks (TBs). PDSCH can carry up to two codewords. Scrambling and modulation mapping of each codeword can be performed, and modulation symbols generated from each codeword can be mapped to one or more layers. Each layer is mapped to a radio resource together with a DMRS and generated as an OFDM symbol signal. Then, the OFDM symbol signal is sent through the corresponding antenna port.

[0136] PUCCH means a physical layer UL channel used for UCI transmission. PUCCH carries UCI. UCI includes the following information.

[0137] - Scheduling Request (SR): information used to request UL-SCH resources.

[0138] - Hybrid Automatic Repeat Request (HARQ) - Acknowledgement (ACK): A response to a DL data packet (e.g., a codeword) on the PDSCH. HARQ-ACK indicates whether the communication device successfully received the DL data packet. In response to a single codeword, a 1-bit HARQ-ACK may be sent. In response to two codewords, a 2-bit HARQ-ACK may be sent. HARQ-ACK responses include positive ACK (abbreviated as ACK), negative ACK (NACK), discontinuous transmission (DTX), or NACK / DTX. Here, the term HARQ-ACK may be used interchangeably with HARQ ACK / NACK, ACK / NACK, or A / N.

[0139] - Channel State Information (CSI): Feedback information about a DL channel. CSI may include channel quality information (CQI), rank indicator (RI), precoding matrix indicator (PMI), CSI-RS resource indicator (CSI), SS / PBCH resource block indicator (SSBRI), and layer indicator (L1). According to the type of UCI included in the CSI, the CSI may be classified into CSI part 1 and CSI part 2. For example, CRI, RI, and / or CQI of a first codeword may be included in CSI part 1, and LI, PMI, and / or CQI of a second codeword may be included in CSI part 2.

[0140] In the present disclosure, for convenience, the PUCCH resources configured / indicated by the BS for / to the UE for HARQ-ACK, SR, and CSI transmission are respectively referred to as HARQ-ACK PUCCH resources, SR PUCCH resources, and CSI PUCCH resources.

[0141] According to the UCI payload size and / or transmission length (eg, the number of symbols included in the PUCCH resource), the PUCCH format may be defined as follows: For the PUCCH format, reference may also be made to Table 7.

[0142] (0) PUCCH format 0 (PF0 or F0)

[0143] - Supported UCI payload size: up to K bits (e.g., K=2)

[0144] -The number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., X=2)

[0145] -Transmission structure: Only UCI signal without DMRS is included in PUCCH format 0. UE sends UCI status by selecting and sending one of multiple sequences. For example, UE sends specific UCI to BS by sending one of multiple sequences via PUCCH (PUCCH format 0). UE sends PUCCH (PUCCH format 0) in PUCCH resources for corresponding SR configuration only when sending positive SR.

[0146] - The configuration of PUCCH format 0 includes the following parameters corresponding to the PUCCH resource: the index of the initial cyclic shift, the number of symbols used for PUCCH transmission and / or the first symbol used for PUCCH transmission.

[0147] (1) PUCCH format 1 (PF1 or F1)

[0148] - Supported UCI payload size: up to K bits (e.g., K=2)

[0149] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y=4 and Z=14)

[0150] -Transmission structure: DMRS and UCI are configured / mapped to different OFDM symbols by TDM. In other words, DMRS is transmitted in symbols where modulation symbols are not transmitted, and UCI is expressed as the product between a specific sequence (e.g., orthogonal cover code (OCC)) and a modulation (e.g., QPSK) symbol. Code division multiplexing (CDM) is supported between multiple PUCCH resources (compliant with PUCCH format 1) (within the same RB) by applying cyclic shift (CS) / OCC to both UCI and DMRS. PUCCH format 1 carries up to 2 bits of UCI, and modulation symbols are spread in the time domain by OCC (configured differently depending on whether frequency hopping is performed).

[0151] - The configuration of PUCCH format 1 includes the following parameters corresponding to the PUCCH resource: the index of the initial cyclic shift, the number of symbols used for PUCCH transmission, the first symbol used for PUCCH transmission and / or the index of the OCC.

[0152] (2) PUCCH format 2 (PF2 or F2)

[0153] - Supported UCI payload size: more than K bits (e.g., K=2)

[0154] -The number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., X=2)

[0155] -Transmission structure: DMRS and UCI are configured / mapped using frequency division multiplexing (FDM) within the same symbol. The UE transmits UCI by applying IFFT without DFT to the coded UCI bits. PUCCH format 2 carries UCI of a larger bit size than K bits, and the modulation symbols are subjected to FDM with DMRS for transmission. For example, DMRS is located in symbol indexes #1, #4, #7, and #10 within a given RB with a density of 1 / 3. Pseudo-noise (PN) sequences are used for DMRS sequences. Frequency hopping can be enabled for 2-symbol PUCCH format 2.

[0156] - The configuration of PUCCH format 2 includes the following parameters corresponding to the PUCCH resources: the number of PRBs, the number of symbols used for PUCCH transmission and / or the first symbol used for PUCCH transmission.

[0157] (3) PUCCH format 3 (PF3 or F3)

[0158] - Supported UCI payload size: more than K bits (e.g., K=2)

[0159] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y=4 and Z=14)

[0160] - Transmission structure: DMRS and UCI are configured / mapped to different OFDM symbols by TDM. UE transmits UCI by applying DFT to the coded UCI bits. PUCCH format 3 does not support UE multiplexing for the same time-frequency resource (eg, the same PRB).

[0161] - The configuration of PUCCH format 3 includes the following parameters corresponding to the PUCCH resources: the number of PRBs, the number of symbols used for PUCCH transmission and / or the first symbol used for PUCCH transmission.

[0162] (4) PUCCH format 4 (PF4 or F4)

[0163] - Supported UCI payload size: more than K bits (e.g., K=2)

[0164] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y=4 and Z=14)

[0165] -Transmission structure: DMRS and UCI are configured / mapped to different OFDM symbols by TDM. By applying OCC in the front end of DFT and applying CS (or interleaved FDM (IFDM) mapping) to DMRS, PUCCH format 4 can multiplex up to 4 UEs in the same PRB. In other words, the modulation symbol of UCI is subjected to TDM with DMRS for transmission.

[0166] - The configuration of PUCCH format 4 includes the following parameters for the corresponding PUCCH resources: the number of symbols for PUCCH transmission, the length of OCC, the index of OCC, and the first symbol for PUCCH transmission.

[0167] The following table shows PUCCH formats. According to the PUCCH transmission length, PUCCH formats can be divided into short PUCCH formats (format 0 and 2) and long PUCCH formats (format 1, 3, and 4).

[0168] [Table 7]

[0169]

[0170] PUCCH resources can be determined according to the UCI type (e.g., A / N, SR, or CSI). The PUCCH resources for UCI transmission can be determined based on the UCI (payload) size. For example, the BS can configure multiple PUCCH resource sets for the UE, and the UE can select a specific PUCCH resource set corresponding to a specific range according to the range of the UCI (payload) size (e.g., the number of UCI bits). For example, the UE can select one of the following PUCCH resource sets according to the number of UCI bits NUCI. - PUCCH resource set #0, if the number of UCI bits = <2

[0171] - PUCCH resource set #1, if 2 < the number of UCI bits = < N1 ...

[0173] - PUCCH resource set #(K - 1), if N K-2 < the number of UCI bits = < N K-1

[0174] Here, K represents the number of PUCCH resource sets (K > 1), and N i represents the maximum number of UCI bits supported by PUCCH resource set #i. For example, PUCCH resource set #1 can include resources of PUCCH formats 0 to 1, and other PUCCH resource sets can include resources of PUCCH formats 2 to 4 (see Table 7).

[0175] The configuration of each PUCCH resource includes a PUCCH resource index, a starting PRB index, and the configuration of one of PUCCH formats 0 to 4. The BS configures the code rate for multiplexing HARQ-ACK, SR, and CSI reports in PUCCH transmission using PUCCH format 2, PUCCH format 3, or PUCCH format 4 for the UE through the higher layer parameter maxCodeRate. The higher layer parameter maxCodeRate is used to determine how to feedback UCI on the PUCCH resources of PUCCH formats 2, 3, or 4.

[0176] If the UCI type is SR and CSI, the PUCCH resources to be used for UCI transmission in the PUCCH resource set may be configured for the UE through high-layer signaling (e.g., RRC signaling). If the UCI type is HARQ-ACK for a semi-persistently scheduled (SPS) PDSCH, the PUCCH resources to be used for UCI transmission in the PUCCH resource set may be configured for the UE through high-layer signaling (e.g., RRC signaling). On the other hand, if the UCI type is HARQ-ACK for a PDSCH scheduled by DCI, the PUCCH resources to be used for UCI transmission in the PUCCH resource set may be scheduled by DCI.

[0177] In the case of DCI-based PUCCH resource scheduling, the BS may send DCI to the UE on the PDCCH and indicate the PUCCH resources to be used for UCI transmission in a specific PUCCH resource set through an ACK / NACK resource indicator (ARI) in the DCI. The ARI may be used to indicate the PUCCH resources used for ACK / NACK transmission and is also referred to as a PUCCH resource indicator (PRI). Here, the DCI may be used for PDSCH scheduling and the UCI may include HARQ-ACK for the PDSCH. The BS may configure a PUCCH resource set including a greater number of PUCCH resources than the state that the ARI can represent for the UE through (UE-specific) high-level (e.g., RRC) signaling. The ARI may indicate a PUCCH resource subset of the PUCCH resource set, and which PUCCH resource in the indicated PUCCH resource subset to be used may be determined according to an implicit rule based on transmission resource information about the PDCCH (e.g., the starting CCE index of the PDCCH).

[0178] For UL-SCH data transmission, the UE should have UL resources available for the UE, and for DL-SCH data reception, the UE should have DL resources available for the UE. The BS assigns UL resources and DL resources to the UE through resource allocation. Resource allocation may include time domain resource allocation (TDRA) and frequency domain resource allocation (FDRA). In the present disclosure, UL resource allocation is also referred to as UL grant, and DL resource allocation is referred to as DL assignment. The UL grant is dynamically received by the UE on the PDCCH or in the RAR, or semi-persistently configured by the BS for the UE through RRC signaling. The DL assignment is dynamically received by the UE on the PDCCH, or semi-persistently configured by the BS for the UE through RRC signaling.

[0179] On the UL, the BS can dynamically allocate UL resources to the UE via a PDCCH addressed to a cell radio network temporary identifier (C-RNTI). The UE monitors the PDCCH to discover possible UL grants for UL transmission. The BS can use a configuration grant to allocate UL resources to the UE. Two types of configuration grants can be used, type 1 and type 2. In type 1, the BS directly provides the configured UL grant (including periodicity) through RRC signaling. In type 2, the BS can configure the periodicity of the RRC-configured UL grant through RRC signaling, and signal, enable or disable the configured UL grant by addressing the PDCCH to the configuration scheduling RNTI (CS-RNTI). For example, in type 2, the PDCCH addressed to the CS-RNTI indicates that until deactivation, the corresponding UL grant can be implicitly reused according to the periodicity configured by RRC signaling.

[0180] On the DL, the BS may dynamically allocate DL resources to the UE via the PDCCH addressed to the C-RNTI. The UE monitors the PDCCH to discover possible DL assignments. The BS may use SPS to allocate DL resources to the UE. The BS may configure the periodicity of the configured DL assignments via RRC signaling, and signal, enable, or disable the configured DL assignments via the PDCCH addressed to the CS-RNTI. For example, the PDCCH addressed to the CS-RNTI indicates that until deactivation, the corresponding DL assignment may be implicitly reused according to the periodicity configured via RRC signaling.

[0181] Hereinafter, resource allocation through PDCCH and resource allocation through RRC will be described in more detail.

[0182] * Resource allocation via PDCCH: dynamic grant / assignment

[0183] The PDCCH may be used to schedule DL transmissions on the PDSCH and UL transmissions on the PUSCH. The DCI on the PDCCH for scheduling DL transmissions may include a DL resource assignment, which includes at least a modulation and coding format (e.g., modulation and coding scheme (MCS)) index associated with the DL-SCH. MCS), resource allocation and HARQ information. The DCI on the PDCCH for scheduling UL transmission may include a UL scheduling grant, which includes at least a modulation and coding format associated with the UL-SCH, resource allocation and HARQ information. The size and purpose of the DCI carried by a PDCCH vary according to the DCI format. For example, DCI format 0_0, DCI format 0_1 ​​or DCI format 0_2 may be used to schedule PUSCH, and DCI format 1_0, DCI format 1_1 or DCI format 1_2 may be used to schedule PDSCH. Specifically, DCI format 0_2 and DCI format 1_2 may be used to schedule transmissions with higher transmission reliability and lower delay requirements than those guaranteed by DCI format 0_0, DCI format 0_1, DCI format 1_0, or DCI format 1_1. Some implementations of the present disclosure may be applied to UL data transmission based on DCL format 0_2. Some implementations of the present disclosure may be applied to DL data reception based on DCI format 1_2.

[0184] Figure 7 An example of PDSCH TDRA caused by PDCCH and an example of PUSCH TDRA caused by PDCCH are shown.

[0185] The DCI carried by the PDCCH for scheduling PDSCH or PUSCH includes a TDRA field. The TDRA field provides a value m of row index m+1 for the allocation table of PDSCH or PUSCH. The predefined default PDSCH time domain allocation is applied as the allocation table of PDSCH, or the PDSCH TDRA table configured by the BS through the RRC signal pdsch-TimeDomainAllocationList is applied as the allocation table of PDSCH. The predefined default PUSCH time domain allocation is applied as the allocation table of PUSCH, or the PUSCH TDRA table configured by the BS through the RRC signal pusch-TimeDomainAllocationList is applied as the allocation table of PUSCH. The PDSCH TDRA table to be applied and / or the PUSCH TDRA table to be applied can be determined according to fixed / predefined rules (for example, refer to 3GPPTS 38.214).

[0186] In the PDSCH time domain resource configuration, each index row defines the DL assignment with the PDSCH time slot offset K0, the start and length indicator value SLIV (or the starting position (e.g., starting symbol index S) and allocation length (e.g., number of symbols L) of the PDSCH in the direct time slot), and the PDSCH mapping type. In the PUSCH time domain resource configuration, each index row defines the UL grant with the PUSCH time slot offset K2, the starting position (e.g., starting symbol index S) and allocation length (e.g., number of symbols L) of the PUSCH in the time slot, and the PUSCH mapping type. K0 of PDSCH and K2 of PUSCH indicate the difference between the time slot with PDCCH and the time slot with PDSCH or PUSCH corresponding to PDCCH. SLIV represents a joint indicator of the starting symbol S relative to the beginning of the time slot with PDSCH or PUSCH and the number of consecutive symbols L counted from symbol S. The PDSCH / PUSCH mapping type includes two mapping types: one is mapping type A and the other is mapping type B. In PDSCH / PUSCH mapping type A, a demodulation reference signal (DMRS) is located in the third symbol (symbol #2) or the fourth symbol (symbol #3) in a slot according to RRC signaling. In PDSCH / PUSCH mapping type B, a DMRS is located in the first symbol allocated for PDSCH / PUSCH.

[0187] The scheduling DCI includes an FDRA field that provides assignment information about RBs for PDSCH or PUSCH. For example, the FDRA field provides the UE with information about the cell used for PDSCH or PUSCH transmission, information about the BWP used for PDSCH or PUSCH transmission, and / or information about RBs used for PDSCH or PUSCH transmission.

[0188] * Resource allocation via RRC

[0189] As described above, there are two types of transmission without dynamic grant: configuration grant type 1 and configuration grant type 2. In configuration grant type 1, the UL grant is provided by RRC signaling and is stored as a configuration UL grant. In configuration grant type 2, the UL grant is provided by PDCCH and is stored or cleared as a configuration UL grant based on L1 signaling indicating activation or deactivation of the configuration UL grant. Type 1 and type 2 can be configured by RRC signaling per serving cell and per BWP. Multiple configurations can be enabled simultaneously on different serving cells.

[0190] When configuration grant type 1 is configured, the following parameters may be provided to the UE via RRC signaling:

[0191] -cs-RNTI, corresponding to the CS-RNTI used for retransmission;

[0192] -periodicity, corresponds to the periodicity of configuration permission type 1;

[0193] -timeDomainOffset, indicating the resource offset in the time domain relative to the system frame number (SFN) = 0;

[0194] -timeDomainAllocation value m, providing the row index m+1 pointing to the allocation table, indicating the combination of start symbol S, length L and PUSCH mapping type;

[0195] -frequencyDomainAllocation, which provides frequency domain resource allocation; and

[0196] -mcsAndTBS, which provides I2C indicating the modulation order, target code rate, and transport block size MCS .

[0197] When a configuration grant type 1 is configured for a serving cell through RRC, the UE stores the UL grant provided by the RRC as the configured UL grant for the indicated serving cell, and initializes or reinitializes the configured UL grant to start at a symbol according to timeDomainOffset and S (derived from SLIV) and repeat with periodicity. After configuring the UL grant for configuration grant type 1, the UE may consider the UL grant to be repeated in association with each symbol that satisfies the following formula: [(SFN*numberOfSlotsPerFrame(numberOfSymbolsPerSlot)+(number of slots in frame*numberOfSymbolsPerSlot)+number of symbols in slot]=(timeDomainOffset*numberOfSymbolsPerSlot+S+N*periodicity)modulo(1024*numberOfSlotsPerFrame*numberOfSymbolsPerSlot), for all N>=0, where numberOfSlotsPerFrame and numberOfSymbolsPerSlot indicate the number of consecutive slots per frame and the number of consecutive OFDM symbols per slot, respectively (refer to Tables 1 and 2).

[0198] For configuration grant type 2, the BS may provide the following parameters to the UE via RRC signaling:

[0199] -cs-RNTI, corresponding to the CS-RNTI used for activation, deactivation and retransmission; and

[0200] -periodicity, provides the periodicity for configuring permission type 2.

[0201] The actual UL grant is provided to the UE via the PDCCH (addressed to the CS-RNTI). After configuring the UL grant for configuration grant type 2, the UE may consider the UL grant to be repeated with each symbol that satisfies the following equation: [(SFN*numberOfSlotsPerFrame*numberOfSymbolsPerSlot)+(number of slots in a frame*numberOfSymbolsPerSlot)+number of symbols in a slot]=[(SFN start time *numberOfSlotsPerFrame*numberOfSymbolsPerSlot+slot start time *numberOfSymbolsPerSlot+symbol start time )+N*periodicity]modulo(1024*numberOfSlotsPerFrame*numberOfSymbolsPerSlot), for all N>=0, where SFN start time 、slot start time and symbol start time denote the SFN, slot and symbol of the first transmission opportunity of PUSCH after the configuration grant is (re)initialized, respectively, numberOfSlotsPerFrame and numberOfSymbolsPerSlot indicate the number of consecutive slots per frame and the number of consecutive OFDM symbols per slot, respectively (refer to Table 1 and Table 2).

[0202] On the DL, SPS can be provided to the UE via RRC signaling from the BS per serving cell and per BWP. For DL ​​SPS, the DL assignment is provided to the UE via PDCCH and is stored or cleared based on L1 signaling indicating SPS activation or deactivation. When configuring SPS, the BS can provide the following parameters to the UE via RRC signaling:

[0203] -cs-RNTI, corresponding to the CS-RNTI used for activation, deactivation and retransmission;

[0204] -nrofHARQ-Processes, providing the number of HARQ processes used for SPS; and

[0205] -periodicity, provides the periodicity of the configured DL assignments for SPS.

[0206] After configuring DL assignments for SPS, the UE may sequentially consider that the Nth DL assignment occurs in a slot that satisfies the following equation: (numberOfSlotsPerFrame*SFN+number of slots in a frame)=[(numberOfSlotsPerFrame*SFN start time +slot start time )+N*periodicity*numberOfSlotsPerFrame / 10]modulo(1024*numberOfSlotsPerFrame), where SFN start time and slot start time denote the SFN and time slot of the first transmission of PDSCH after the configuration DL assignment is (re)initialized, numberOfSlotsPerFrame and numberOfSymbolsPerSlot respectively indicate the number of consecutive time slots per frame and the number of consecutive OFDM symbols per time slot (refer to Table 1 and Table 2).

[0207] If the CRC of the corresponding DCI format is scrambled with the CS-RNTI provided by the RRC parameter cs-RNTI and the New Data Indicator field of the Enabled Transport Block is set to 0, the UE verifies the DL SPS assignment PDCCH or configures the UL grant type 2 PDCCH for scheduling enablement or scheduling release. If all fields of the DCI format are set according to Table 8 or Table 9, the verification of the DCI format is achieved. Table 8 shows an example of special fields for DL ​​SPS and UL grant type 2 scheduling enable PDCCH verification, and Table 9 shows an example of special fields for DL ​​SPS and UL grant type 2 scheduling release PDCCH verification.

[0208] [Table 8]

[0209]

[0210] [Table 9]

[0211] DCI format 0_0 DCI format 1_0 HARQ process number Set all to "0" Set all to "0" Redundant version Set to "00" Set to "00" Modulation and coding schemes Set all to "1" Set all to "1" Resource Block Assignment Set all to "1" Set all to "1"

[0212] The actual DL assignment or UL grant and the corresponding MCS for DL ​​SPS or UL grant type 2 are provided by the resource assignment field (e.g., the TDRA field providing the TDRA value m, the FDRA field providing the frequency RB allocation, and / or the MCS field) in the DCI format carried by the corresponding DL SPS or UL grant type 2 scheduling enable PDCCH. If verification is implemented, the UE regards the information in the DCI format as a valid enablement or a valid release of DL SPS or configuration UL grant type 2.

[0213] Figure 8The HARQ-ACK transmission / reception process is shown.

[0214] Reference Figure 8 , the UE may detect the PDCCH in slot n. Next, the UE may receive the PDSCH in slot n+K0 according to the scheduling information received through the PDCCH in slot n, and then send the UCI through the PUCCH in slot n+K1. In this case, the UCI includes the HARQ-ACK response to the PDSCH.

[0215] The DCI (eg, DCI format 1_0 or DCI format 1_1) carried by the PDCCH for scheduling the PDSCH may include the following information.

[0216] -FDRA: FDRA indicates the RB set allocated to PDSCH.

[0217] -TDRA: TDRA indicates the DL assignment and PDSCH slot offset K0, the starting position (e.g., symbol index S) and length (e.g., number of symbols L) of the PDSCH in the slot, and the PDSCH mapping type. PDSCH mapping type A or PDSCH mapping type B may be indicated by TDRA. For PDSCH mapping type A, the DMRS is located in the third symbol (symbol #2) or the fourth symbol (symbol #3) in the slot. For PDSCH mapping type B, the DMRS is allocated in the first symbol allocated for the PDSCH.

[0218] -PDSCH-to-HARQ_feedback timing indicator: This indicator indicates K1.

[0219] If the PDSCH is configured to transmit up to one TB, the HARQ-ACK response may consist of one bit. If the PDSCH is configured to transmit up to 2 TB, the HARQ-ACK response may consist of 2 bits when spatial bundling is not configured and one bit when spatial bundling is configured. When the HARQ-ACK transmission timing for multiple PDSCHs is specified as time slot n+K1, the UCI sent in time slot #n+K1 includes the HARQ-ACK responses for multiple PDSCHs.

[0220] In the present disclosure, a HARQ-ACK payload consisting of HARQ-ACK bits of one or more PDSCHs may be referred to as a HARQ-ACK codebook. According to a HARQ-ACK payload determination scheme, a HARQ-ACK codebook may be classified into a semi-static HARQ-ACK codebook and a dynamic HARQ-ACK codebook.

[0221] In the case of a semi-static HARQ-ACK codebook, parameters related to the HARQ-ACK payload size to be reported by the UE are semi-statically configured by a (UE-specific) high-level (e.g., RRC) signal. For example, the HARQ-ACK payload size of the semi-static HARQ-ACK codebook and the (maximum) HARQ-ACK payload (size) sent by one PUCCH in one slot may be determined based on the number of HARQ-ACK bits corresponding to a combination (hereinafter, the bundling window) of all DL carriers (i.e., DL serving cells) configured for the UE and all DL scheduling slots (or PDSCH transmission slots or PDCCH monitoring slots) that may indicate HARQ-ACK transmission timing. That is, in the semi-static HARQ-ACK codebook scheme, the size of the HARQ-ACK codebook is fixed (to a maximum value) regardless of the amount of DL data actually scheduled. For example, the DL grant DCI (PDCCH) includes PDSCH and HARQ-ACK timing information, and the PDSCH and HARQ-ACK timing information may have one of multiple values ​​(e.g., k). For example, when a PDSCH is received in time slot #m and the PDSCH in the DL grant DCI (PDCCH) for scheduling the PDSCH indicates k with the HARQ-ACK timing information, the HARQ-ACK information of the PDSCH may be sent in time slot #(m+k). As an example, k∈{1,2,3,4,5,6,7,8}. When HARQ-ACK information is sent in time slot #n, the HARQ-ACK information may include the maximum possible HARQ-ACK based on the bundling window. That is, the HARQ-ACK information of time slot #n may include the HARQ-ACK corresponding to time slot #(nk). For example, when k∈{1,2,3,4,5,6,7,8}, the HARQ-ACK information of time slot #n may include the HARQ-ACK corresponding to time slot #(n-8) to time slot #(n-1), regardless of the actual DL data reception (ie, the maximum number of HARQ-ACKs). Here, the HARQ-ACK information may be replaced by a HARQ-ACK codebook or a HARQ-ACK payload. The time slot may be understood / replaced as a candidate time for DL ​​data reception. As described in the example, the bundling window may be determined based on the PDSCH and HARQ-ACK timing based on the HARQ-ACK time slot, and the PDSCH and HARQ-ACK timing sets may have predefined values ​​(e.g., {1, 2, 3, 4, 5, 6, 7, 8}) or may be configured by high-layer (RRC) signaling. In the case of a dynamic HARQ-ACK codebook, the HARQ-ACK payload size to be reported by the UE may be dynamically changed through DCI or the like. In the dynamic HARQ-ACK codebook scheme, the DL scheduling DCI may include counter-DAI (i.e., c-DAI) and / or total-DAI (i.e., t-DAI).Here, DAI indicates a downlink assignment index and is used by the BS to inform the UE of the PDSCH to be included in one HARQ-ACK transmission sent or scheduled. Specifically, c-DAI is an index indicating the order between PDCCHs carrying DL scheduling DCI (hereinafter, DL scheduling PDCCHs), and t-DAI is an index indicating the total number of DL scheduling PDCCHs until the current time slot in which there is a PDCCH with t-DAI.

[0222] In the NR system, a method of implementing multiple logical networks in a single physical network is considered. The logical network needs to support services with various requirements (e.g., eMBB, mMTC, URLLC, etc.). Therefore, the physical layer of NR is designed to support a flexible transmission structure in consideration of various service requirements. As an example, if necessary, the physical layer of NR can change the OFDM symbol length (OFDM symbol duration) and subcarrier spacing (SCS) (hereinafter, OFDM parameter set). The transmission resources of the physical channel can also be changed within a predetermined range (in symbols). For example, in NR, PUCCH (resources) and PUSCH (resources) can be configured to flexibly have a transmission length / transmission start timing within a predetermined range.

[0223] In a wireless communication system including a BS and a UE, when the UE transmits UCI on a PUCCH, the PUCCH resource may overlap with another PUCCH resource or a PUSCH resource on a time axis. For example, with respect to the same UE, (1) PUCCH (resource) and PUCCH (resource) (for different UCI transmissions) or (2) PUCCH (resource) and PUSCH (resource) may overlap on a time axis (in the same time slot). The UE may not support PUCCH-PUCCH simultaneous transmission or PUCCH-PUSCH simultaneous transmission (according to a limitation on UE capabilities or according to configuration information received from the BS). In addition, the UE may not be allowed to simultaneously transmit multiple UL channels within a predetermined time range.

[0224] In the present disclosure, a method for processing multiple UL channels when there are UL channels that the UE should transmit within a predetermined time range is described. In the present disclosure, a method for processing UCI and / or data that should have been transmitted / received on the UL channel is also described. The following terms are used in the description of the examples in the present disclosure.

[0225] -UCI: UCI means control information sent by the UE on the UL. UCI includes multiple types of control information (ie, UCI types). For example, UCI may include HARQ-ACK (abbreviated as A / N or AN), SR and / or CSI.

[0226] -UCI multiplexing: UCI multiplexing may refer to the operation of sending different UCI (UCI types) on a common physical UL channel (e.g., PUCCH or PUSCH). UCI multiplexing may include multiplexing of different UCI (UCI types). For convenience, the multiplexed UCI is referred to as MUX UCI. In addition, UCI multiplexing may include operations performed on MUX UCI. For example, UCI multiplexing may include the process of determining UL channel resources for sending MUX UCI.

[0227] -UCI / data multiplexing: UCI / data multiplexing may mean an operation of sending UCI and data on a common physical UL channel (e.g., PUSCH). UCI / data multiplexing may include an operation of multiplexing UCI with data. For convenience, the multiplexed UCI is referred to as MUX UCI / data. In addition, UCI / data multiplexing may include operations performed on MUX UCI / data. For example, UCI / data multiplexing may include a process of determining UL channel resources for sending MUX UCI / data.

[0228] -Slot: A slot means a basic time unit or time interval for data scheduling. A slot includes a plurality of symbols. Here, a symbol may be an OFDM-based symbol (eg, a CP-OFDM symbol or a DFT-s-OFDM symbol).

[0229] - Overlapping UL channel resources: Overlapping UL channel resources mean UL channel (e.g., PUCCH or PUSCH) resources that overlap each other (at least partially) on the time axis within a predetermined time period (e.g., time slot). Overlapping UL channel resources may mean UL channel resources before performing UCI multiplexing. In the present disclosure, UL channels that overlap (at least partially) on the time axis are referred to as conflicting UL channels in the time or time domain.

[0230] Fig. 9 An example of multiplexing UCI with PUSCH is shown. When PUCCH resources and PUSCH resources overlap in a time slot and PUCCH-PUSCH simultaneous transmission is not configured, UCI can be sent on PUSCH as shown. UCI transmission on PUSCH is called UCI piggybacking or PUSCH piggybacking. Specifically, Fig. 9 The case where HARQ-ACK and CSI are carried on PUSCH resources is shown.

[0231] When a plurality of UL channels overlap within a predetermined time interval, a method for a UE to process the UL channels needs to be specified in order to allow a BS to correctly receive the UL channels. Hereinafter, a method of processing a conflict between UL channels will be described.

[0232] Fig.10An example of a process in which a UE with overlapping PUCCHs in a single slot handles collisions between UL channels is shown.

[0233] In order to send UCI, the UE may determine the PUCCH resources for each UCI. Each PUCCH resource may be defined by a starting symbol and a transmission interval. When the PUCCH resources used for PUCCH transmission overlap in a single time slot, the UE may perform UCI multiplexing based on the PUCCH resource with the earliest starting symbol. For example, the UE may determine the (temporally) overlapping PUCCH resources (hereinafter, PUCCH resource B) based on the PUCCH resource with the earliest starting symbol in the time slot (hereinafter, PUCCH resource A) (S1001). The UE may apply UCI multiplexing rules to PUCCH resource A and PUCCH resource B. For example, based on UCI A of PUCCH resource A and UCI B of PUCCH resource B, a MUX UCI including all or part of UCI A and UCI B may be obtained according to the UCI multiplexing rules. In order to multiplex the UCI associated with PUCCH resource A and PUCCH resource B, the UE may determine a single PUCCH resource (hereinafter, MUX PUCCH resource) (S1003). For example, the UE determines a PUCCH resource set (hereinafter, PUCCH resource set X) corresponding to the payload size of the MUX UCI among the PUCCH resource sets configured or available for the UE, and determines one of the PUCCH resources belonging to the PUCCH resource set X as the MUX PUCCH resource. For example, using the PUCCH resource indicator field in the last DCI among the DCIs having the PDSCH-to-HARQ feedback timing indicator field indicating the same slot for PUCCH transmission, the UE may determine one of the PUCCH resources belonging to the PUCCH resource set X as the MUX PUCCH resource. The UE may determine the total number of PRBs of the MUX PUCCH resources based on the payload size of the MUX UCI of the MUX PUCCH resources and the maximum code rate of the PUCCH format. If the MUX PUCCH resources overlap with other PUCCH resources (except PUCCH resource A and PUCCH resource B), the UE may perform the above operation again based on the MUX PUCCH resources (or a PUCCH resource having the earliest starting symbol among other PUCCH resources including the MUX PUCCH resources).

[0234] Fig.11 Shown based on Fig.10 The case where UCI multiplexing is performed. Fig.11 , when multiple PUCCH resources overlap in a time slot, UCI multiplexing may be performed based on the earliest PUCCH resource A (eg, PUCCH resource A with the earliest starting symbol). Fig.11In the example, case 1 and case 2 show that the first PUCCH resource overlaps with another PUCCH resource. In this case, the first PUCCH resource may be regarded as the earliest PUCCH resource A. Fig.10 In contrast, case 3 shows that the first PUCCH resource does not overlap with another PUCCH resource and the second PUCCH resource overlaps with another PUCCH resource. In case 3, UCI multiplexing is not performed on the first PUCCH resource. Instead, UCI multiplexing can be performed in the A state where the second PUCCH resource is regarded as the earliest PUCCH resource. Fig.10 Case 2 shows that it is determined that the MUX PUCCH resource for transmitting the multiplexed UCI has recently overlapped with another PUCCH resource. In this case, the processing may be additionally performed in a state where the MUX PUCCH resource (or the earliest PUCCH resource among other PUCCH resources including the MUX PUCCH resource (e.g., the PUCCH resource with the earliest starting symbol)) is regarded as the earliest PUCCH resource A. Fig.10 processing.

[0235] Fig.12 A process of handling collision between UL channels for a UE with overlapping PUCCH and PUSCH in a single slot is shown.

[0236] In order to transmit UCI, the UE may determine PUCCH resources (S1201). Determining the PUCCH resources for the UCI may include determining MUX PUCCH resources. In other words, determining the PUCCH resources for the UCI by the UE may include determining MUX PUCCH resources based on a plurality of overlapping PUCCHs in a slot.

[0237] The UE may perform UCI piggybacking on the PUSCH resources based on the determined (MUX) PUCCH resources (S1203). For example, when there are PUSCH resources (on which UCI transmission is allowed to be multiplexed), the UE may apply the UCI multiplexing rule to the PUCCH resources that overlap with the PUSCH resources (on the time axis). The UE may send UCI on the PUSCH.

[0238] When there is no PUSCH overlapping with the determined PUCCH resources in the slot, S1103 is omitted and UCI may be transmitted on the PUCCH.

[0239] When the determined PUCCH resource overlaps with multiple PUSCHs on the time axis, the UE may multiplex the UCI with one of the PUSCHs. For example, when the UE intends to send a PUSCH to each serving cell, the UE may multiplex the UCI on the PUSCH of a specific serving cell (e.g., a serving cell with the smallest serving cell index) among the serving cells. When there is more than one PUSCH in a time slot of a specific serving cell, the UE may multiplex the UCI on the earliest PUSCH sent in the time slot.

[0240] Fig.13 UCI multiplexing considering timeline conditions is shown. When the UE performs UCI and / or data multiplexing for overlapping PUCCH and / or PUSCH on the time axis, the UE may lack processing time for UCI and / or data multiplexing due to the flexible UL timing configuration of PUCCH or PUSCH. In order to prevent the UE from having insufficient processing time, the following two timeline conditions (hereinafter, multiplexing timeline conditions) are considered in the process of performing UCI / data multiplexing for overlapping PUCCH and / or PUSCH (on the time axis).

[0241] (1) Receive the last symbol of the PDSCH corresponding to the HARQ-ACK information before the start symbol time N1+ of the earliest channel among the overlapping PUCCH and / or PUSCH (on the time axis). T1 can be determined based on i) the minimum PDSCH processing time N1 defined according to the UE processing capability and / or ii) d1 predefined as an integer equal to or greater than 0 according to the scheduling symbol position, DMRS position in PUSCH, BWP switching, etc.

[0242] For example, T1 can be determined as follows: T1 = (N1 + d1) * (2048 + 144) * κ * 2 -u *T c N1 is based on the u of UE processing capabilities #1 and #2 in Table 10 and Table 11 respectively, where u is the maximum T1 (u PDCCH ,u PDSCH ,u UL ), where u PDCCH Corresponding to the subcarrier spacing of the PDCCH used to schedule the PDSCH, u PDSCH Corresponding to the subcarrier spacing of the scheduled PDSCH, u UL corresponds to the subcarrier spacing of the UL channel where HARQ-ACK is to be sent, and κ = T c / T f =64. In Table 10, N 1,0 In the case of, if the PDSCH DMRS position of the added DMRS is l1=12, then N 1,0 =14, otherwise N 1,0=13 (refer to Section 7.4.1.1.2 of 3GPP TS 38.211). If the last symbol of the PDSCH of PDSCH mapping type A exists in the i-th slot, then for i<7, d1=7 -i , otherwise d1=0. If the PDSCH has mapping type B for UE processing capability #1, d1 may be 0 when the number of allocated PDSCH symbols is 7, d1 may be 3 when the number of allocated PDSCH symbols is 4, and d1 may be 3+d when the number of allocated PDSCH symbols is 2, where d is the number of overlapping symbols of the scheduled PDCCH and the scheduled PDSCH. If for UE processing capability #2, the PDSCH mapping type is B, d1 may be 0 when the number of allocated PDSCH symbols is 7, and d1 may correspond to the number of overlapping symbols of the scheduled PDCCH and the scheduled PDSCH when the number of allocated PDSCH symbols is 4. In addition, if the number of allocated PDSCH symbols is 2, d1 may be 3 when the scheduled PDSCH is within a 3-symbol CORESET and the CORESET and PDSCH have the same starting symbol. For other cases, d1 may be the number of overlapping symbols of the scheduled PDCCH and the scheduled PDSCH. In this disclosure, T1 may also be referred to as T_proc,1.

[0243] (2) The last symbol of the PDCCH used to indicate (e.g., trigger) PUCCH or PUSCH transmission is received before the start symbol time T2 of the earliest channel among the overlapping PUCCH and / or PUSCH (on the time axis). T2 can be determined based on i) the minimum PUSCH preparation time N1 defined according to the UE PUSCH timing capability and / or ii) d2 predefined as an integer equal to or greater than 0 according to the scheduled symbol position, BWP switching, etc. d2 can be classified as d related to the scheduled symbol position. 2,1 and d related to BWP switching 2,2 .

[0244] For example, T2 can be determined as follows: T2 = max{(N2 + d 2,1 )*(2048+144)*κ*2 -u *T c ,d 2,2 N2 is based on u of UE timing capabilities #1 and #2 in Table 12 and Table 13, respectively, and u is the (u DL ,u UL ), where u DL The subcarrier spacing corresponding to the PDCCH carrying the DCI for scheduling PUSCH, u UL corresponds to the subcarrier spacing of PUSCH, and κ = T c / T f=64. If the first symbol allocated by PUSCH consists of DMRS only, then d 2,1 Can be 0, otherwise d 2,1 Can be 1. If the scheduling DCI triggers BWP switching, then d 2,2 Equal to the switching time, otherwise d 2,2 is 0. The switching time may be defined differently according to the frequency range (FR). For example, the switching time may be defined as 0.5 ms for FR1 and 0.25 ms for FR2. In the present disclosure, T2 may also be referred to as T_proc,2.

[0245] The following table shows the processing time according to the UE processing capability. Specifically, Table 10 shows the PDSCH processing time of the UE's PDSCH processing capability #1, Table 11 shows the PDSCH processing time of the UE's PDSCH processing capability #2, Table 12 shows the PUSCH preparation time of the UE's PUSCH timing capability #1, and Table 13 shows the PUSCH processing time of the UE's PUSCH timing capability #2.

[0246] [Table 10]

[0247]

[0248] [Table 11]

[0249] u / SCS PDSCH decoding time N1 [symbol] 0 / 15kHz 3 1 / 30kHz 4.5 2 / 60kHz For frequency range 1, 9

[0250] [Table 12]

[0251] u / SCS PUSCH preparation time N2 [symbol] 0 / 15kHz 10 1 / 30kHz 12 2 / 60kHz 23 3 / 120kHz 36

[0252] [Table 13]

[0253] u / SCS PUSCH preparation time N2 [symbol] 0 / 15kHz 5 1 / 30kHz 5.5 2 / 60kHz For frequency range 1, 11

[0254] If a UE configured to multiplex different UCI types within one PUCCH intends to send multiple overlapping PUCCHs in a timeslot or to send overlapping PUCCHs and PUSCHs in a timeslot, the UE may multiplex the UCI type when certain conditions are met. The certain conditions may include a multiplexing timeline condition. For example, Figures 10 to 12 The PUCCH and PUSCH for which UCI is multiplexed can be UL channels that meet the multiplexing timeline conditions. Fig.13 , the UE may need to send multiple UL channels (e.g., UL channels #1 to #4) in the same time slot. Here, UL CH #1 may be a PUSCH scheduled by PDCCH #1. UL CH #2 may be a PUCCH for sending HARQ-ACK for PDSCH. PDSCH is scheduled by PDCCH #2, and the resources of UL CH #2 may also be indicated by PDCCH #2.

[0255] In this case, if the overlapping UL channels (e.g., UL channels #1 to #3) on the time axis satisfy the multiplexing timeline condition, the UE may perform UCI multiplexing for the overlapping UL channels #1 to #3 on the time axis. For example, the UE may check whether the first symbol of UL CH#3 starting from the last symbol of PDSCH satisfies the condition of T1. The UE may also check whether the first symbol of UL CH#3 starting from the last symbol of PDCCH#1 satisfies the condition of T2. If the multiplexing timeline condition is satisfied, the UE may perform UCI multiplexing for UL channels #1 to #3. In contrast, if the earliest UL channel (e.g., the UL channel with the earliest starting symbol) among the overlapping UL channels does not satisfy the multiplexing timeline condition, the UE may not be allowed to multiplex all corresponding UCI types.

[0256] Fig.14 The transmission of multiple HARQ-ACK PUCCHs in a time slot is shown.

[0257] The current NR standard specification (e.g., 3GPP TS 38.213 V15.2.0) specifies that the UE should not send a PUCCH with HARQ-ACK information in more than one time slot. Therefore, according to the current NR standard specification, the UE may send at most one PUCCH with HARQ-ACK information in one time slot. In order to prevent the situation where the UE fails to send HARQ-ACK information due to restrictions on the number of HARQ-ACK PUCCHs that the UE can send, the BS needs to perform DL scheduling so that the HARQ-ACK information can be multiplexed on one PUCCH resource. However, when considering services with strict delay and reliability requirements (e.g., URLLC services), a scheme that concentrates multiple HARQ-ACK feedbacks on only one PUCCH in a time slot may not be desirable in terms of PUCCH performance. In addition, in order to support delay-critical services, the BS may need to schedule multiple consecutive PDSCHs with short duration in one time slot. Although the UE can send PUCCH in random symbols in a time slot by the configuration / instruction of the BS, if the UE is only allowed to send at most one HARQ-ACK PUCCH in a time slot, the BS may not be able to perform fast back-to-back scheduling for PDSCH and UE to perform fast HARQ-ACK feedback. Therefore, in order to flexibly and efficiently use resources and support services, it is better to allow multiple (non-overlapping) HARQ-ACK PUCCHs (or PUSCHs) to be sent in one time slot, such as Fig.14 shown.

[0258] A control channel corresponding to a specific target service, QoS, block error rate (BLER) requirement, reliability requirement, latency requirement, and / or processing time (or a control channel for scheduling a data channel corresponding thereto) includes DCI. To support a specific target service, QoS, BLER requirement, reliability requirement, latency requirement, and / or processing time, the size of the DCI field may be configured such that its DCI size is different from the existing DCI size. For example, among methods for supporting highly reliable communication services in a short time in packet transmission / reception such as URLLC, as a method for reducing downlink signaling overhead, configuring a DCI field with a configurable size may be considered. In other words, considering such a DCI format, scheduling for URLLC support can be easily performed through it, or by configuring the DCI field differently according to the requirements of the BS, the downlink signaling overhead is reduced compared to DCI formats 0_0 / 0_1 / 1_0 / 1_1.

[0259] For ease of description, the DCI included in a control channel corresponding to a specific target service, QoS, BLER requirement, reliability requirement, latency requirement, and / or processing time (or a control channel for scheduling a data channel corresponding thereto) (e.g., the DCI field included in the DCI or the DCI with a DCI field whose size can be configured by the BS) is hereinafter referred to as the new DCI format. The new DCI format may include DCI format 0_2 for scheduling PUSCH in a cell and DCI format 1_2 for scheduling PDSCH in a cell.

[0260] When the UE receives the PDSCH scheduled by the DCI, the time domain resource assignment (TDRA) field of the DCI provides the row index m + 1 to the assignment table. The index row defines, for example, the slot offset K0 and SLIV, or directly defines the starting symbol S to be assumed in PDSCH reception, the assignment length L, and the PDSCH mapping type. When the parameter values of the index row are provided, in some scenarios:

[0261] - The slot allocated for the PDSCH is floor{n*(2 uPDSCH / 2 uPDCCH )}+K0, where n is the slot having the scheduling DCI, K0 is based on the parameter set of the PDSCH, and uPDSCH and uPDCCH are the subcarrier spacing configurations of the PDSCH and PDCCH,

[0262] - The starting symbol S relative to the start of the slot and the number of consecutive symbols L counted from the starting symbol S of the allocated PDSCH are determined from the start and length indicator SLIV: If (L - 1)<=7, then SLIV = 14*(L - 1)+S, otherwise SLIV = 14*(14 - L + 1)+(14 - 1 - S), where 0 < L <= 14 - S, and

[0263] -PDSCH mapping type is set to type A or type B.

[0264] In the above scenario, in the PDSCH allocated through SLIV, the boundary of the slot (eg, the beginning of the slot) is used as a reference point for determining the PDSCH start symbol.

[0265] Fig.15 Multiple transmissions scheduled in a time slot are shown.

[0266] It may be desirable to support scheduling multiple transmissions in a time slot in order to support low latency communications such as URLLC. For example, it may be desirable to support multiple PUSCHs or multiple PDCCHs in a time slot. For example, in order to schedule multiple transmissions (e.g., multiple PDSCHs or multiple PUSCHs) in a time slot, it is necessary to indicate multiple SLIVs corresponding to the multiple transmissions in the relevant DCI through specific fields (e.g., TDRA fields), respectively. For example, referring to Fig.15 In order to schedule 7 2-symbol PDSCH0 to PDSCH6 in a 14-symbol time slot, 7 separate SLIVs need to be indicated through the TDRA field (e.g., SLIV n={symbol #0 and #1}, SLIV n+1={symbol #2 and #3}, ..., SLIV n+6={symbol #12 and #13}). Since the BS configures the candidate TDRA entries through RRC signaling, the BS needs to configure a TDRA table including at least 7 different TDRA entries that can indicate at least 7 different SLIVs through RRC signaling to allow scheduling. Fig.15 7 2-symbol PDSCHs are shown. This is because the PDSCH allocated through SLIV uses the boundary of the time slot as a reference point to determine the starting symbol of the PDSCH.

[0267] On the other hand, for PDSCH allocated by SLIV, when the start symbol of the monitoring opportunity to which the PDCCH belongs is used as a reference point for determining the start symbol of the PDSCH, 7 2-symbol PDSCHs can be scheduled in a 14-symbol slot using only the state corresponding to one SLIV. Fig.15 For example, the TDRA field of each of DCI0 to DCI6 may determine a value indicating the starting symbol of the corresponding PDSCH determined based on the start of the PDCCH monitoring opportunity carrying the corresponding DCI. Fig.15, for example, since each of DCI0 to DCI6 schedules a 2-symbol PDSCH two symbols after the start of the corresponding DCI, a TDRA entry including an SLIV that can indicate a 2-symbol offset from the start of the corresponding PDCCH monitoring occasion and has a symbol length of 2 can be configured. To perform cross-carrier scheduling using the PDSCH resource allocation method based on this new reference point (e.g., for the case where the carrier carrying the PDCCH (hereinafter, the PDCCH transmission carrier) and the carrier carrying the PDSCH (hereinafter, the PDSCH transmission carrier) are different), the following may need to be considered.

[0268] If cross-carrier scheduling is configured, the subcarrier spacing (SCS) of the PDCCH transmission carrier may be different from the SCS of the corresponding PDSCH transmission carrier. If the SCS of the PDCCH transmission carrier is different from the SCS of the corresponding PDSCH transmission carrier (if the SCS of the PDCCH transmission carrier < the SCS of the PDCCH transmission carrier), the starting symbol of the monitoring occasion to which the PDCCH belongs may be mapped to multiple symbols of the PDSCH transmission carrier, or vice versa (if the SCS of the PDCCH transmission carrier > the SCS of the PDCCH transmission carrier), the starting symbol of the monitoring occasion to which the PDCCH belongs may not be aligned with a single symbol of the PDSCH transmission carrier. This may lead to ambiguity in the resource allocation of the PDSCH.

[0269] To prevent such ambiguity, rules can be defined such that a PDSCH resource allocation based on the new reference point is not configured for the carriers with cross-carrier scheduling (or such that the UE does not expect such a configuration). That is, rules can be defined such that a PDSCH resource allocation based on the new reference point can only be configured for the carriers with self-carrier scheduling (e.g., scheduling where the PDCCH transmission carrier is the same as the corresponding PDSCH transmission carrier). When a PDSCH resource allocation based on the new reference point is configured for a cell, the UE and the BS can, for example, determine the starting symbol value indicating the starting symbol of the PDSCH based on the start of the PDCCH monitoring occasion to which the DCI scheduling the PDSCH belongs when determining the starting symbol value of the PDSCH.

[0270] Alternatively, when cross-carrier scheduling is configured for at least one carrier, rules can be defined such that a PDSCH resource allocation based on the new reference point is not configured (or such that the UE does not expect such a configuration). That is, rules can be defined such that a PDSCH resource allocation based on the new reference point can only be configured when self-carrier scheduling is configured for all carriers (e.g., scheduling where the PDCCH transmission carrier is the same as the corresponding PDSCH transmission carrier).

[0271] Alternatively, when cross-carrier scheduling is configured, a rule may be defined such that if the SCS of the scheduled cell is smaller than the SCS of the scheduling cell, PDSCH resource allocation based on the new reference point is not configured (or such that the UE does not expect such configuration). That is, when cross-carrier scheduling is configured, a rule may be defined such that PDSCH resource allocation based on the new reference point may be configured only when the SCS of the scheduled cell is equal to the SCS of the scheduling cell or the SCS of the scheduled cell is greater than the SCS of the scheduling cell.

[0272] Alternatively, when cross-carrier scheduling is configured, rules can be defined so that PDSCH resource allocation based on the new reference point is applied only when the SCS of the scheduled cell is equal to the SCS of the scheduling cell or the SCS of the scheduled cell is greater than the SCS of the scheduling cell, otherwise PDSCH resource allocation based on the time slot boundary reference point is applied.

[0273] When a cell is notified of the application of a new reference point by a signal, the BS may determine the SLIV so that the SLIV indicates a relative starting position relative to, for example, a starting symbol of a PDCCH monitoring opportunity in which a DCI for scheduling a PDSCH for the cell is transmitted, and transmit the DCI including information about the SLIV (e.g., a TDRA entry). When a cell is notified of the application of a new reference point by a signal, a UE that has received a PDSCH scheduled by the DCI may determine the starting symbol S of the PDSCH under the assumption that it is a value relative to the starting symbol S0 of the PDCCH monitoring opportunity in which the DCI is detected when determining the starting symbol S of the PDSCH based on the SLIV determined according to the DCI.

[0274] In some implementations of the present disclosure, PDSCH resource allocation based on the new reference point may be restrictively used for new DCI formats for scheduling PDSCH other than DCI format 1_0 and DCI format 1_1 among the DCI formats for scheduling PDSCH. For example, in some implementations of the present disclosure, for DCI format 1_0 and DCI format 1_1, PDSCH resource allocation is applied based on the slot boundary reference point, and the new reference point may be applied only to DCI format 1_2, which is another DCI format for scheduling PDSCH. For example, in the case of DCI format 1_0 and / or DCI format 1_1, the BS may allocate PDSCH resources based on the slot boundary, and the UE may determine the PDSCH resource allocation based on the slot boundary. In the case of DCI format 1_2, for example, in some implementations of the present disclosure, a rule may be defined such that configuration of PDSCH resource allocation based on the new reference point is allowed (or such that the UE expects such configuration) only when the SCS of the scheduled cell is equal to the SCS of the scheduling cell. For example, if the SCS of the scheduled cell is equal to the SCS of the scheduling cell, the BS may be allowed to notify the UE that a new reference point applies to DCI format 1_2 so as to inform the UE of the starting symbol and the number of PDSCH symbols according to the SLIV determined based on the new reference point.

[0275] In the present disclosure, the priority, target service (e.g., URLLC), QoS, block error rate (BLER) requirement, reliability requirement, delay requirement and / or processing time of a specific channel can be configured through a high-level signal, explicitly indicated through a specific field of the DCI, distinguished by the search space to which the PDCCH (scheduling DL / UL data) belongs, distinguished by the CORESET to which the PDCCH (scheduling DL / UL data) belongs, distinguished by the RNTI, distinguished by the DCI format, or distinguished by the CRC mask of the PDCCH. The examples of the present disclosure can also be applied to processing multiple types of channels distinguished by a specific field of the DCI, a search space to which the PDCCH belongs, a CORESET to which the PDCCH belongs, an RNTI, a DCI format and / or a CRC mask of the PDCCH, without explicitly distinguishing the target service, QoS, BLER requirement, reliability requirement, delay requirement and / or processing time of the channel. In the present disclosure, "a channel corresponding to a specific target service, QoS, BLER requirement, reliability requirement, delay requirement and / or processing time" may be replaced by "a specific channel among multiple types of channels distinguished by a specific field of DCI, a search space to which the PDCCH belongs, a CORESET to which the PDCCH belongs, RNTI, a DCI format and / or a CRC mask of the PDCCH" and applied to the examples of the present disclosure.

[0276] Fig.16 and Fig.17Another example of a DCI transmission / reception process according to some implementations of the present disclosure is shown.

[0277] The BS may perform operations for DCI transmission according to some implementations of the present disclosure. The BS may include at least one transceiver, at least one processor, and at least one computer memory operably connectable to the at least one processor and storing instructions, which, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. A processing device for the BS may include at least one processor and at least one computer memory operably connectable to the at least one processor and storing instructions, which, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. A computer-readable storage medium may store at least one computer program including instructions, which, when executed by at least one processor, cause the at least one processor to perform operations according to some implementations of the present disclosure. Reference Fig.16 In some implementations of the present disclosure, the operation may include, for example, determining whether to apply a reference point other than the beginning of a time slot allocated for a PDSCH to a cell based on a subcarrier spacing of a cell and a subcarrier spacing of a scheduling cell of the cell (S1601). The operation may include: determining a starting symbol value representing a starting symbol of a PDSCH to be sent on the cell based on the determination; and sending a DCI including information about the starting symbol value (hereinafter, symbol information) on a scheduling cell of the cell (S1603). The determination of whether to apply a starting symbol value based on a reference point may include: applying symbol information based on a reference point when the subcarrier spacing of a cell is equal to the subcarrier spacing of a scheduling cell. The determination of whether to apply a starting symbol value based on a reference point may also include: receiving information notifying application of a reference point when the subcarrier spacing of a cell is equal to the subcarrier spacing of a scheduling cell. The reference point may be the beginning of a physical uplink control channel (PDCCH) monitoring opportunity for sending DCI. The determination of whether to apply a starting symbol value based on a reference point may be performed only for DCI formats 1_2. The determination of the start symbol of the PDSCH may include: when the subcarrier spacing of the cell is less than the subcarrier spacing of the scheduling cell, applying the start symbol value based on the beginning of the time slot allocated for the PDSCH. The operation may include: when the subcarrier spacing of the cell is less than the subcarrier spacing of the scheduling cell, not receiving information notifying the application of the reference point.

[0278] The UE may perform operations for DCI reception according to some implementations of the present disclosure. The UE may include at least one transceiver, at least one processor, and at least one computer memory operably connectable to the at least one processor and storing instructions, which, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. A processing device for the UE may include at least one processor and at least one computer memory operably connectable to the at least one processor and storing instructions, which, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. A computer-readable storage medium may store at least one computer program including instructions, which, when executed by at least one processor, cause the at least one processor to perform operations according to some implementations of the present disclosure. Reference Fig.17In some implementations of the present disclosure, the operation may include, for example, determining whether to apply a reference point other than the beginning of a time slot allocated for PDSCH to a cell based on a subcarrier spacing of a cell and a subcarrier spacing of a scheduling cell of the cell (S1701). The operation may include applying a starting symbol value derived from symbol information in a DCI that schedules PDSCH based on the determination based on the beginning or reference point of a time slot allocated for PDSCH (S1703). For example, the operation may include determining that a starting symbol value is relative to a reference symbol other than the beginning of a time slot allocated for PDSCH when the subcarrier spacing of the cell is equal to the subcarrier spacing of the scheduling cell. As another example, the operation may include determining that a starting symbol value is a value relative to the beginning of a time slot allocated for PDSCH when the subcarrier spacing of the cell is less than the subcarrier spacing of the scheduling cell. Determining a starting symbol value based on a reference point may include determining a starting symbol value of PDSCH based on a reference point when the subcarrier spacing is equal to the subcarrier spacing of the scheduling cell. Determining a starting symbol value based on a reference point may include sending information notifying application of a reference point when the subcarrier spacing of the cell is equal to the subcarrier spacing of the scheduling cell. The reference point may be the beginning of the physical uplink control channel (PDCCH) monitoring opportunity for sending DCI. Whether the determination of the starting symbol value is determined based on the reference point may be performed only for DCI formats 1_2. The symbol information may be time domain resource allocation information about the time slot and length indicator value (SLIV) representing the starting symbol and the number of symbols. Determining the starting symbol value based on the reference point may include: when the subcarrier spacing of the cell is less than the subcarrier spacing of the scheduling cell, determining the starting symbol value of the PDSCH based on the beginning of the time slot allocated for the PDSCH. The operation may include: when the subcarrier spacing of the cell is less than the subcarrier spacing of the scheduling cell, not sending information indicating the application of the reference point. Examples of the present disclosure as described above have been presented to enable ordinary technicians in the field to implement and practice the present disclosure. Although the present disclosure is described with reference to examples, those skilled in the art may make various modifications and changes in the examples of the present disclosure. Therefore, the present disclosure is not intended to be limited to the examples set forth herein, but is consistent with the widest scope consistent with the principles and features disclosed herein.

[0279] Industrial Applicability

[0280] Implementations of the present disclosure may be used in a BS, a UE, or other devices in a wireless communication system.

Claims

1. A method performed by a base station, the method comprising the following steps: Sending downlink control information DCI to a user equipment on a first cell for scheduling a second cell, wherein the DCI includes information about a start symbol S and a length L of a physical downlink shared channel PDSCH for the second cell; as well as transmitting the PDSCH to the user equipment in L consecutive symbols starting from the start symbol S in a time slot allocated for the PDSCH based on the DCI, in, Based on the user equipment being configured with a reference to a start and length indicator value SLIV for the DCI: the start symbol S is related to a start symbol of a physical downlink control channel PDCCH monitoring opportunity for transmitting the DCI, and Based on the reference that the user equipment is not configured with the SLIV for the DCI: the start symbol S is related to the start symbol of the time slot allocated for the PDSCH, Wherein, in a state where the subcarrier spacing of the second cell is equal to the subcarrier spacing of the first cell, the base station configures the user equipment to have the reference for the SLIV of the DCI for the second cell, and Wherein, when the subcarrier spacing of the second cell is smaller than the subcarrier spacing of the first cell, the base station does not configure the user equipment with the reference for the SLIV of the DCI for the second cell.

2. The method according to claim 1, wherein: The DCI is DCI format 1_2.

3. The method according to claim 1 or 2, wherein: The DCI includes time domain resource allocation information providing a value m for row index m+1 for a PDSCH allocation table, and The PDSCH allocation table includes a plurality of rows, wherein each row at least defines a downlink assignment and a PDSCH time slot offset K0 and SLIV.

4. A method performed by a user equipment, the method comprising the following steps: Receiving downlink control information DCI on a first cell for scheduling a second cell, the DCI including information about a starting symbol S and a length L of a physical downlink shared channel PDSCH for the second cell; receiving the PDSCH in L consecutive symbols starting from the start symbol S in a time slot allocated for the PDSCH based on the DCI, in, Based on the user equipment being configured with a reference to a start and length indicator value SLIV for the DCI: the start symbol S is related to a start symbol of a physical downlink control channel PDCCH monitoring opportunity at which the DCI is detected, and Based on the reference that the user equipment is not configured with the SLIV for the DCI: the start symbol S is related to the start symbol of the time slot allocated for the PDSCH, Wherein, in a state where the subcarrier spacing of the second cell is equal to the subcarrier spacing of the first cell, the user equipment is configured with the reference for the SLIV of the DCI for the second cell, and Wherein, when the subcarrier spacing of the second cell is smaller than the subcarrier spacing of the first cell, the user equipment is not expected to be configured with the reference for the SLIV of the DCI for the second cell.

5. The method according to claim 4, wherein: The DCI is DCI format 1_2.

6. The method according to claim 4 or 5, wherein: The DCI includes time domain resource allocation information providing a value m for row index m+1 for a PDSCH allocation table, and The PDSCH allocation table includes a plurality of rows, wherein each row at least defines a downlink assignment and a PDSCH time slot offset K0 and SLIV.

7. A base station, comprising: at least one transceiver; at least one processor; as well as at least one computer memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: Sending downlink control information DCI to a user equipment on a first cell for scheduling a second cell, the DCI including information about a start symbol S and a length L of a physical downlink shared channel PDSCH for the second cell; and transmitting the PDSCH to the user equipment in L consecutive symbols starting from the start symbol S in a time slot allocated for the PDSCH based on the DCI, in, Based on the user equipment being configured with a reference to a start and length indicator value SLIV for the DCI: the start symbol S is related to a start symbol of a physical downlink control channel PDCCH monitoring opportunity for transmitting the DCI, and Based on the reference that the user equipment is not configured with the SLIV for the DCI: the start symbol S is related to the start symbol of the time slot allocated for the PDSCH, Wherein, in a state where the subcarrier spacing of the second cell is equal to the subcarrier spacing of the first cell, the base station configures the user equipment to have the reference for the SLIV of the DCI for the second cell, and Wherein, when the subcarrier spacing of the second cell is smaller than the subcarrier spacing of the first cell, the base station does not configure the user equipment with the reference for the SLIV of the DCI for the second cell.

8. The base station according to claim 7, wherein: The DCI is DCI format 1_2.

9. The base station according to claim 7 or 8, wherein: The DCI includes time domain resource allocation information providing a value m for row index m+1 for a PDSCH allocation table, and The PDSCH allocation table includes a plurality of rows, wherein each row at least defines a downlink assignment and a PDSCH time slot offset K0 and SLIV.

10. A user equipment, the user equipment comprising: at least one transceiver; at least one processor; as well as at least one computer memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: Receiving downlink control information DCI on a first cell for scheduling a second cell, the DCI including information about a starting symbol S and a length L of a physical downlink shared channel PDSCH for the second cell; receiving the PDSCH in L consecutive symbols starting from the start symbol S in a time slot allocated for the PDSCH based on the DCI, in, Based on the user equipment being configured with a reference to a start and length indicator value SLIV for the DCI: the start symbol S is related to a start symbol of a physical downlink control channel PDCCH monitoring opportunity at which the DCI is detected, and Based on the reference that the user equipment is not configured with the SLIV for the DCI: the start symbol S is related to the start symbol of the time slot allocated for the PDSCH, Wherein, in a state where the subcarrier spacing of the second cell is equal to the subcarrier spacing of the first cell, the user equipment is configured with the reference for the SLIV of the DCI for the second cell, and Wherein, when the subcarrier spacing of the second cell is smaller than the subcarrier spacing of the first cell, the user equipment is not expected to be configured with the reference for the SLIV of the DCI for the second cell.

11. The user equipment according to claim 10, wherein: The DCI is DCI format 1_2.

12. The user equipment according to claim 10 or 11, wherein: The DCI includes time domain resource allocation information providing a value m for row index m+1 for a PDSCH allocation table, and The PDSCH allocation table includes a plurality of rows, wherein each row at least defines a downlink assignment and a PDSCH time slot offset K0 and SLIV.

13. A device for a user device, the device comprising: at least one processor; as well as at least one computer memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: Receiving downlink control information DCI on a first cell for scheduling a second cell, the DCI including information about a starting symbol S and a length L of a physical downlink shared channel PDSCH for the second cell; receiving the PDSCH in L consecutive symbols starting from the start symbol S in a time slot allocated for the PDSCH based on the DCI, in, Based on the user equipment being configured with a reference to a start and length indicator value SLIV for the DCI: the start symbol S is related to a start symbol of a physical downlink control channel PDCCH monitoring opportunity at which the DCI is detected, and Based on the reference that the user equipment is not configured with the SLIV for the DCI: the start symbol S is related to the start symbol of the time slot allocated for the PDSCH, Wherein, in a state where the subcarrier spacing of the second cell is equal to the subcarrier spacing of the first cell, the user equipment is configured with the reference for the SLIV of the DCI for the second cell, and Wherein, when the subcarrier spacing of the second cell is smaller than the subcarrier spacing of the first cell, the user equipment is not expected to be configured with the reference for the SLIV of the DCI for the second cell.

14. The device according to claim 13, wherein: The DCI is DCI format 1_2.

15. The apparatus according to claim 13 or 14, wherein: The DCI includes time domain resource allocation information providing a value m for row index m+1 for a PDSCH allocation table, and The PDSCH allocation table includes a plurality of rows, wherein each row at least defines a downlink assignment and a PDSCH time slot offset K0 and SLIV.

16. A computer-readable storage medium storing at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations for a user device, the operations comprising: Receiving downlink control information DCI on a first cell for scheduling a second cell, the DCI including information about a starting symbol S and a length L of a physical downlink shared channel PDSCH for the second cell; receiving the PDSCH in L consecutive symbols starting from the start symbol S in a time slot allocated for the PDSCH based on the DCI, in, Based on the user equipment being configured with a reference to a start and length indicator value SLIV for the DCI: the start symbol S is related to a start symbol of a physical downlink control channel PDCCH monitoring opportunity at which the DCI is detected, and Based on the reference that the user equipment is not configured with the SLIV for the DCI: the start symbol S is related to the start symbol of the time slot allocated for the PDSCH, Wherein, in a state where the subcarrier spacing of the second cell is equal to the subcarrier spacing of the first cell, the user equipment is configured with the reference for the SLIV of the DCI for the second cell, and Wherein, when the subcarrier spacing of the second cell is smaller than the subcarrier spacing of the first cell, the user equipment is not expected to be configured with the reference for the SLIV of the DCI for the second cell.

17. The computer-readable storage medium of claim 16, wherein: The DCI is DCI format 1_2.

18. The computer-readable storage medium according to claim 16 or 17, wherein: The DCI includes time domain resource allocation information providing a value m for row index m+1 for a PDSCH allocation table, and The PDSCH allocation table includes a plurality of rows, wherein each row at least defines a downlink assignment and a PDSCH time slot offset K0 and SLIV.

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