Terminal, base station in wireless communication system, and method for performing same

Abstract

A communication method and system for converging a 5th-Generation (5G) communication system supporting higher data rates than a 4th-Generation (4G) system and an Internet of Things (IoT) technology are provided. The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and security services. The present disclosure discloses a method and apparatus for supporting transmission and reception to a plurality of TRPs, and a method and apparatus for updating PDSCH beam information of several serving cells together in the case of CA.

Description

[0001] This application is a divisional application of the following application: Application number: 202080025444.4; Application date: September 28, 2020; Invention name: "Method and device for supporting simultaneous transmission and reception to multiple sending and receiving points in the next generation mobile communication system". Technical Field

[0002] The present disclosure relates to a next generation mobile communication system. More particularly, the present disclosure relates to a method and apparatus for supporting simultaneous transmission and reception to multiple transmission and reception points (TRPs) in a next generation mobile communication system. Background Art

[0003] In order to meet the demand for increased wireless data traffic since the deployment of the fourth generation (4G) communication system, efforts have been made to develop improved fifth generation (5G) or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also referred to as "beyond 4G networks" or "post-long term evolution (LTE) systems". The 5G communication system defined by the 3rd generation partnership project (3GPP) is called the New Radio (NR) system. The 5G communication system defined by 3GPP is called the New Radio (NR) system.

[0004] 5G communication systems are considered to be implemented in higher frequency (millimeter wave) bands (e.g., 60 GHz bands) in order to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technologies have been discussed and adopted in 5G communication systems.

[0005] In addition, in the 5G communication system, system network improvements are being developed based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, collaborative communications, coordinated multi-points (CoMP), receiving-end interference elimination, etc.

[0006] In 5G systems, hybrid FSK (frequency shift keying) and QAM (quadrature amplitude modulation) modulation (FSK and QAM Modulation, FQAM) and sliding window superposition coding (SWSC) as advanced coding modulation (ACM) have been developed, and filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have been developed.

[0007] The Internet, as a human-centered connected network in which humans generate and consume information, is now developing towards the Internet of Things (IoT), in which distributed entities exchange and process information without human intervention. The Internet of Everything (IoE) has emerged, which is a combination of IoT technology and big data processing technology through connection with cloud servers. As IoT implementation requires technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology" and "security technology", sensor networks, machine-to-machine (M2M) communication, machine type communication (MTC), etc. have been recently studied. Such an IoT environment can provide smart Internet technology services, which create new value for human life by collecting and analyzing data generated between connected things. IoT can be applied to various fields, including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart appliances, and advanced medical services, through the integration and combination of existing information technology (IT) with various industrial applications.

[0008] In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine type communications (MTC), and machine-to-machine (M2M) communications can be implemented through beamforming, MIMO, and array antennas. Cloud radio access networks (RANs) as an application of the above-mentioned big data processing technologies can also be considered as an example of the fusion of 5G technologies and IoT technologies.

[0009] Meanwhile, with the recent development of communication systems, research on a communication method based on a plurality of transmission reception points (TRPs) has been actively conducted, and improvements in such communication methods are ongoing.

[0010] The above information is provided as background information only to assist in understanding the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art to the present disclosure. Summary of the invention

[0011] Technical issues

[0012] In the next generation wireless communication systems, there is a need to enhance operations regarding multiple TRPs.

[0013] Problem Solution

[0014] Various aspects of the present disclosure are intended to at least solve the above-mentioned problems and / or disadvantages, and to at least provide the following advantages. Therefore, aspects of the present disclosure provide a method in which, in a next-generation mobile communication system using a beam, a terminal performs a method of sending data to and receiving data from multiple (or dual) transmission and reception points (TRPs) by receiving multiple (or dual) physical downlink control channels (PDCCHs). To this end, the multiple-input multiple-output (MIMO) capability of the terminal is utilized, and the base station performs sending data to and receiving data from the corresponding terminal through the dual TRPs configured in the cell or the adjacent cell.

[0015] In addition, regarding the operation of configuring and activating beam information (e.g., transmission configuration indication (TCI) state) used by a terminal to receive a physical downlink shared channel (PDSCH) in a next-generation mobile communication system using beams, generally, activation / deactivation of beams (or TCI states) is possible only for a specific bandwidth part (BWP) in one serving cell. Therefore, in a state where carrier aggregation (CA) is applied, in order to update the beam configuration of multiple carriers and BWPs, several activation / deactivation indication operations need to be repeated sequentially. Another aspect of the present disclosure is to provide a method for solving delays and the resulting signaling overhead.

[0016] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments.

[0017] According to aspects of the present disclosure, a method performed by a terminal in a wireless communication system is provided. The method includes receiving a radio resource control (RRC) message configuring a plurality of transmission configuration indicator (TCI) states associated with a physical downlink shared channel (PDSCH), receiving a media access control (MAC) control element (CE) activating at least one TCI state of a bandwidth part (BWP) of a serving cell among the plurality of TCI states, wherein the MAC CE includes information indicating that at least one TCI state is a TRP for a first transmission and reception point (TRP) or a second TRP, receiving downlink control information (DCI) scheduling a PDSCH from the TRP, the DCI including TCI information indicating a TCI state for the PDSCH from the at least one TCI state, and receiving a PDSCH scheduled by the DCI based on the TCI state indicated by the TCI information from the TRP.

[0018] The information may include 1 bit corresponding to the first TRP or the second TRP.

[0019] The RRC message may also use the index of a control resource set (CORESET) to configure the CORESET for the BWP of the serving cell.

[0020] The TRP can be index-based, identified by information from the first TRP or the second TRP.

[0021] The PDSCH scheduled by the first physical downlink control channel (PDCCH) from the first TRP and the second PDCCH from the second TRP may overlap in the time domain and the frequency domain.

[0022] According to another aspect of the present disclosure, a method performed by a transmission and reception point (TRP) in a wireless communication system is provided. The method includes sending a radio resource control (RRC) message to configure a plurality of transmission configuration indicator (TCI) states associated with a physical downlink shared channel (PDSCH) to a terminal, sending a media access control (MAC) control element (CE) to activate at least one TCI state of a bandwidth part (BWP) of a serving cell among the plurality of TCI states to the terminal, wherein the MAC CE includes information indicating that at least one TCI state is a transmission and reception point TRP for a first transmission and reception point (TRP) or a second TRP, sending downlink control information (DCI) for scheduling PDSCH to the terminal, the DCI including TCI information indicating a TCI state for PDSCH from at least one TCI state, and sending a PDSCH scheduled by the DCI based on the TCI state indicated by the TCI information to the terminal.

[0023] According to another aspect of the present disclosure, a terminal in a wireless communication system is provided. The terminal includes a transceiver configured to send and receive signals, and a controller configured to receive a radio resource control (RRC) message configuring a plurality of transmission configuration indicator (TCI) states associated with a physical downlink shared channel (PDSCH), receive a media access control (MAC) control element (CE) activating at least one TCI state of a bandwidth part (BWP) of a serving cell among the plurality of TCI states, wherein the MAC CE includes information indicating that at least one TCI state is a TRP for a first transmission and reception point (TRP) or a second TRP, receive downlink control information (DCI) scheduling a PDSCH from the TRP, the DCI including TCI information indicating a TCI state for the PDSCH from at least one TCI state, and receive a PDSCH scheduled by the DCI based on the TCI state indicated by the TCI information from the TRP.

[0024] According to another aspect of the present disclosure, a transmission and reception point (TRP) in a wireless communication system is provided. The transmission and TRP includes: a transceiver configured to transmit and receive signals; and a controller configured to send a radio resource control (RRC) message to a terminal to configure a plurality of transmission configuration indicator (TCI) states associated with a physical downlink shared channel (PDSCH), send a media access control (MAC) control element (CE) to the terminal to activate at least one TCI state of a bandwidth part (BWP) of a serving cell among the plurality of TCI states, wherein the MAC CE includes information indicating that at least one TCI state is a TRP for a first transmission and reception point (TRP) or a second TRP, send downlink control information (DCI) for scheduling PDSCH to the terminal, the DCI includes TCI information indicating a TCI state for PDSCH from at least one TCI state, and send a PDSCH scheduled by the DCI based on the TCI state indicated by the TCI information to the terminal.

[0025] According to an embodiment of the present disclosure, a method in which, in a beam-based communication system, a terminal performs data transmission to and receives data from multiple (or dual) TRPs by receiving multiple (or dual) PDCCHs can be improved. In addition, a method in which a base station transmits data to and receives data from a terminal by using a dual TRP configured in a cell or an adjacent cell using the MIMO capability of the terminal can be improved.

[0026] According to another embodiment of the present disclosure, in the next generation mobile communication system, in a state where CA is configured, the received beam information of the PDSCH applied to multiple service cells and configured in the BWP of the corresponding cell can be updated simultaneously, thereby reducing the delay time for applying the corresponding configuration and reducing the signaling overhead therefor.

[0027] Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.

[0028] Advantageous Effects of the Invention

[0029] According to various embodiments of the present disclosure, multi-TRP related operations can be effectively enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0031] Figure 1A is a schematic diagram showing the structure of an LTE system according to an embodiment of the present disclosure;

[0032] Figure 1B is a schematic diagram showing a radio protocol structure in an LTE system according to an embodiment of the present disclosure;

[0033] Figure 1C is a schematic diagram showing a structure of a next generation mobile communication system according to an embodiment of the present disclosure;

[0034] Figure 1D is a schematic diagram showing a radio protocol structure of a next generation mobile communication system according to an embodiment of the present disclosure;

[0035] Figure 1E is a schematic diagram showing the structure of another next generation mobile communication system according to an embodiment of the present disclosure;

[0036] Figure 1F is a schematic diagram showing an example of a frame structure used by an NR system according to an embodiment of the present disclosure;

[0037] Figure 1G is a schematic diagram illustrating a method for implementing PUCCH transmission for each of a plurality of TRPs configured in an NR system according to an embodiment of the present disclosure;

[0038] Figure 1His a schematic diagram showing a method for implementing receiving a physical downlink shared channel (PDSCH) from each of a plurality of TRPs configured in an NR system in the same time unit (e.g., time slot or symbol) according to an embodiment of the present disclosure;

[0039] Figure 1IA and Figure 1IB is a schematic diagram showing the overall impact on PDCCHs transmitted from multiple TRPs, a method for activating a downlink candidate beam group, and a structure of a medium access control (MAC) control element (CE) according to various embodiments of the present disclosure;

[0040] Figure 1JA and Figure 1JB is a schematic diagram showing the overall impact on PDSCHs transmitted from multiple TRPs, a method for activating downlink candidate beam groups, and a MAC CE structure according to various embodiments of the present disclosure;

[0041] Figure 1K is a schematic diagram showing a configuration method for implementing PUCCH transmission to multiple TRPs according to an embodiment of the present disclosure;

[0042] Figure 1LA and Figure 1LB is a schematic diagram showing a separate PUCCH configuration for implementing PUCCH transmission to multiple TRPs, a method for activating a beam for transmitting the configuration, and a MAC CE structure according to various embodiments of the present disclosure;

[0043] Figure 1M is a schematic diagram showing the overall operation of a UE for independently performing PDCCH / PDSCH reception and PUCCH transmission through multiple TRPs according to an embodiment of the present disclosure;

[0044] Figure 1N is a schematic diagram showing the overall operation of a UE according to an embodiment of the present disclosure;

[0045] Fig.1O is a schematic diagram showing the overall operation of an eNB according to an embodiment of the present disclosure;

[0046] Figure 1P is a block diagram showing a configuration of a UE according to an embodiment of the present disclosure;

[0047] Figure 1Q is a block diagram showing a configuration of an NR eNB according to an embodiment of the present disclosure;

[0048] Figure 2Ais a schematic diagram showing a method for implementing PUCCH transmission to each of a plurality of TRPs configured in an NR system according to an embodiment of the present disclosure;

[0049] Figure 2B is a schematic diagram showing an entire process for simultaneously applying beam group activation of a downlink signal transmitted to a PDSCH through multiple serving cells and a BWP to multiple serving cells and a BWP in an NR system according to an embodiment of the present disclosure;

[0050] Figure 2C is a schematic diagram showing an overall operation of applying activation and deactivation of a beam of a PDSCH to multiple serving cells and BWPs as operations of all UEs and base stations at the same time according to an embodiment of the present disclosure;

[0051] Figure 2D is a schematic diagram showing a method 2-1 for simultaneously updating TCI states in all configured carriers and BWPs through one TCI state activation / deactivation MAC CE with respect to multiple carriers and BWPs when intra-band CA is applied according to an embodiment of the present disclosure (corresponding carrier / BWP information is mapped to a radio resource control (RRC) configuration);

[0052] Figure 2E is a schematic diagram showing a method 2-2 for simultaneously updating TCI states in all configured carriers and BWPs by one TCI state activation / deactivation MAC CE with respect to multiple carriers and BWPs when intra-band CA is applied according to an embodiment of the present disclosure (corresponding carrier / BWP information is specified in the MAC CE);

[0053] Figure 2F is a schematic diagram showing method 2-3 of simultaneously updating TCI states in all configured carriers and BWPs by one TCI state activation / deactivation MAC CE with respect to multiple carriers and BWPs when inter-band CA is applied according to an embodiment of the present disclosure (corresponding carrier / BWP information is mapped to RRC configuration);

[0054] Figure 2G is a schematic diagram showing a method 2-4 for simultaneously updating TCI states in all configured carriers and BWPs by activating / deactivating a MAC CE for one TCI state with respect to multiple carriers and BWPs when inter-band CA is applied according to an embodiment of the present disclosure (corresponding carrier / BWP information is specified in the MAC CE);

[0055] Figure 2HA , Figure 2HB , Figure 2HC , Figure 2HD and Figure 2HE is a schematic diagram illustrating an operation of simultaneously updating TCI states of multiple carriers and BWPs according to various embodiments of the present disclosure;

[0056] Fig.2I is a schematic diagram showing the overall operation of an eNB according to an embodiment of the present disclosure;

[0057] Figure 2J is a block diagram showing an internal structure of a UE according to an embodiment of the present disclosure; and

[0058] Figure 2K is a block diagram showing the configuration of an NR eNB according to an embodiment of the present disclosure.

[0059] Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures. DETAILED DESCRIPTION

[0060] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details that aid in understanding, but these are to be considered exemplary only. Therefore, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and structures may be omitted for clarity and conciseness.

[0061] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and not for limiting the disclosure as defined by the appended claims and their equivalents.

[0062] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0063] For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted or schematically shown. In addition, the size of each element does not fully reflect the actual size. In the accompanying drawings, the same or corresponding elements have the same reference numerals.

[0064] By referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the ways to achieve them will become apparent. However, the present disclosure is not limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided only to fully disclose the present disclosure and inform those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the attached claims. Throughout the specification, the same or similar reference numerals represent the same or similar elements.

[0065] It should be understood that each block of the flowchart diagram and the combination of blocks in the flowchart diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a method (means) for implementing the functions specified in the flowchart block. These computer program instructions can also be stored in a computer-usable or computer-readable memory, and the computer program instructions can instruct the computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-usable or computer-readable memory generate products including instructions for implementing the functions specified in the flowchart box or box. The computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operations are performed on the computer or other programmable device, thereby generating a computer-implemented process, so that the instructions executed on the computer or other programmable device provide operations for implementing the functions specified in the flowchart block or multiple blocks.

[0066] In addition, each block of the flowchart diagram can represent a code module, a code segment or a code portion, and a code module, a code segment or a code portion includes one or more executable instructions for implementing a specified (multiple) logical function. It should also be noted that in some alternative embodiments, the functions mentioned in the block may not occur in order. For example, depending on the functions involved, two blocks shown in succession can actually be executed substantially simultaneously, or these blocks can sometimes be executed in reverse order.

[0067] As used herein, "unit" refers to a software element or a hardware element that performs a predetermined function, such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC). However, "unit" does not always have the meaning that is limited to software or hardware. "Unit" can be constructed to be stored in an addressable storage medium or to execute one or more processors. Therefore, "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and parameters. The elements and functions provided by "unit" can be combined into fewer elements or "units", or divided into more elements or "units". In addition, elements and "units" or can be implemented as one or more CPUs in a reproduction device or a secure multimedia card.

[0068] In the following description, for the sake of convenience, terms for identifying access nodes, terms related to network entities, terms related to messages, terms related to interfaces between network entities, terms related to various identification information, etc. are illustratively used. Therefore, the present disclosure is not limited to the terms used below, and other terms related to subjects with equivalent technical meanings may be used.

[0069] In the following description, for ease of description, the present disclosure uses terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard. However, the present disclosure is not limited to these terms and names, and can be applied to systems conforming to other standards in the same manner.

[0070] First embodiment

[0071] Figure 1A is a schematic diagram showing a structure of an LTE system for description according to an embodiment of the present disclosure.

[0072] refer to Figure 1A The radio access network of the LTE system includes next-generation base stations (evolved Node B, hereinafter referred to as "eNB", "Node B" or "base station") 1a-05, 1a-10, 1a-15 and 1a-20, a mobility management entity (mobility management entity, MME) 1a-25 and a serving gateway (serving-gateway, SG) 1a-30. User equipment (hereinafter referred to as "UE" or "terminal") 1a-35 accesses the external network through eNB 1a-05 to 1a-20 and S-GW 1a-30.

[0073] exist Figure 1A In the LTE system, eNB 1a-05 to 1a-20 correspond to the existing node B of the universal mobile telecommunication system (UMTS) system. The eNB is connected to the UE 1a-35 through a radio channel and performs a more complex role than the existing node B. In the LTE system, all user services including real-time services (such as voice over IP (VoIP) through the Internet Protocol) are provided through shared channels, so equipment for collecting and scheduling status information such as the buffer status, available transmission power status and channel status of the UE is required, and eNB 1a-05 to eNB 1a-20 are responsible for this. One eNB usually controls multiple cells. For example, in order to achieve a transmission rate of 100Mbps, the LTE system uses, for example, orthogonal frequency division multiplexing (OFDM) in a 20MHz bandwidth as a radio access technology. In addition, according to the channel state of the UE, an adaptive modulation & coding (AMC) scheme is applied to determine the modulation scheme and the channel coding rate. The S-GW 1a-30 is a device that provides a data bearer, and generates or removes a data bearer under the control of the MME 1a-25. The MME is a device in charge of various control functions of the UE and a mobility management function, and is connected to a plurality of eNBs.

[0074] Figure 1B is a schematic diagram showing a radio protocol structure in an LTE system according to an embodiment of the present disclosure.

[0075] refer to Figure 1B In the UE and eNB, the radio protocols of the LTE system include packet data convergence protocol (PDCP) 1b-05 and 1b-40, radio link control (RLC) 1b-10 or 1b-35, and medium access control (MAC) 1b-15 or 1b-30, respectively. PDCP 1b-05 and 1b-40 are responsible for operations such as IP header compression / recovery. The main functions of PDCP are summarized as follows:

[0076] -Header compression and decompression: ROHC only

[0077] -Transfer user data

[0078] - In-sequence delivery of upper layer PDUs during PDCP re-establishment in RLC AM

[0079] - For split bearers in DC (supports RLC AM only): PDCP PDU routing for transmission, and PDCP PDU reordering for reception)

[0080] - Repeated detection of lower layer SDUs during PDCP reestablishment in RLC AM

[0081] - For split bearers in DC, retransmit PDCP SDUs at handover, and for RLC AM, retransmit PDCP PDUs during PDCP data recovery

[0082] -Encryption and decryption

[0083] - Timer-based SDU discard in uplink

[0084] RLC 1b-10 or 1b-35 reconfigures the PDCP protocol data unit (PDU) to an appropriate size and performs automatic repeat request (ARQ) operations. The main functions of RLC are summarized as follows:

[0085] -Transmit upper layer PDU

[0086] - Error correction via ARQ (only applicable for AM data transmission)

[0087] - Concatenation, segmentation and reassembly of RLC SDUs (applicable only to unacknowledged mode (UM) and acknowledged mode (AM) data transmission)

[0088] - Re-segmentation of RLC data PDU (applicable only to AM data transmission)

[0089] - Reordering of RLC data PDUs (applicable only to UM and AM data transmission)

[0090] - Duplicate detection (only for UM and AM data transmission)

[0091] -Protocol error detection (only for AM data transmission)

[0092] - RLC service data unit (SDU) discarded (applicable only to UM and AM data transmission)

[0093] -RLC reconstruction

[0094] MAC 1B-15 and 1b-30 are connected to several RLC layer devices configured in one UE and perform operations of multiplexing RLC PDUs to MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of MAC are summarized as follows:

[0095] -Mapping between logical channels and transport channels

[0096] - Multiplex MAC SDUs belonging to one or more different logical channels to / from a transport block (TB) delivered to the physical layer of a transport channel

[0097] -Dispatch information report

[0098] - Error correction through HARQ

[0099] - Priority handling between logical channels of a UE

[0100] - Priority handling between UEs through dynamic scheduling

[0101] -MBMS service logo

[0102] -Transmission format selection

[0103] -filling

[0104] The physical layer 1b-20 or 1b-25 performs channel coding and modulation on the upper layer data, and converts the obtained data into OFDM symbols to send the OFDM symbols to the radio channel, or demodulates and channel decodes the OFDM symbols received through the radio channel to send the obtained data to the upper layer. In addition, the physical layer also uses hybrid ARQ (HARQ) for additional error correction, and the receiving end sends whether the packet sent by the transmitting end is received with 1 bit. This is called HARQ ACK / NACK information. The downlink HARQ ACK / NACK information about the uplink transmission can be transmitted through the physical hybrid-ARQ indicator channel (PHICH) physical channel, and the uplink HARQ ACK / NACK information about the downlink transmission can be transmitted through the physical uplink control channel (PUCCH) or the physical uplink shared channel (PUSCH) physical channel.

[0105] The PHY layer may include one or more frequencies / carriers. The technology for configuring and using multiple frequencies simultaneously is called carrier aggregation (CA) technology. Only one carrier is used for communication between the terminal (or UE) and the base station (eNB), but in CA technology, a main carrier and one or more subcarriers are attached to significantly increase the transmission volume by the number of subcarriers. In LTE, the cell in the eNB that uses the main carrier is called the primary cell (PCell), and the cell that uses the subcarrier is called the secondary cell (SCell).

[0106] Although not shown in the figure, a radio resource control (hereinafter, referred to as "RRC") layer exists above the PDCP layer of the UE and the eNB, respectively. The RRC layer transmits and receives access and measurement-related configuration control messages for radio resource control.

[0107] Figure 1C is a schematic diagram showing a structure of a next generation mobile communication system according to an embodiment of the present disclosure.

[0108] refer to Figure 1C The radio access network of the next generation mobile communication system includes a next generation base station (new radio Node B (NR NB) or next generation Node B (gNB)) 1c-10 and a new radio core network (NR CN or next generation core network (NG CN)) 1c-05. UE (new radio UE, hereinafter referred to as "NR UE" or "terminal") 1c-15 accesses the external network through NR NB 1c-10 and NR CN 1c-05.

[0109] exist Figure 1CIn the figure, NR NB 1c-10 corresponds to the evolved Node B (eNB) of the existing LTE system. NR NB is connected to NR UE 1c-15 through a wireless channel and can provide services superior to the existing Node B. In the next generation mobile communication system, all user services are served through shared channels, so equipment is required to collect and schedule status information such as the buffer status, available transmission power status and channel status of the UE, and NR NB 1c-10 is responsible for this. One NR NB usually controls multiple cells. In order to achieve ultra-high-speed data transmission compared with the existing LTE, it may have a larger bandwidth than the existing maximum bandwidth, and non-orthogonal frequency division multiplexing (OFDM) may be used as a radio access technology to graft additional beamforming technology. In addition, an adaptive modulation and coding (hereinafter referred to as "AMC") scheme that determines the modulation scheme and channel coding rate according to the channel state of the UE is applied. NR CN 1c-05 performs functions such as mobility support, bearer configuration and quality of service (QoS) configuration. NR CN is a device responsible for various control functions of the UE and mobility management functions, and is connected to multiple eNBs. In addition, the next generation mobile communication system can be linked with the existing LTE system, and the NR CN is connected to the MME 1c-25 through a network interface. The MME is connected to the existing eNB 1c-30.

[0110] Figure 1D is a schematic diagram showing a radio protocol structure of a next generation mobile communication system according to an embodiment of the present disclosure.

[0111] refer to Figure 1D The radio protocols of the next generation mobile communication system include NR service data adaptation protocol (SDAP) 1d-01 and 1d-45, NR PDCP 1d-05 and 1d-40, NR RLC 1d-10 and 1d-35, and NR MAC 1d-15 and 1d-30 in UE and NR eNB, respectively.

[0112] The main functions of NR SDAP 1d-01 and 1d-45 may include one or more of the following functions:

[0113] -Transmitting user plane data

[0114] - Mapping between QoS flows and DRBs for both DL and UL

[0115] - Marking of QoS Flow ID in both DL and UL packets

[0116] - Mapping of Reflective QoS Flows to DRBs for UL SDAP PDUs

[0117] For SDAP layer devices, the UE may be configured with an RRC message for each PDCP layer device, for each bearer, or for each logical channel regarding whether to use the header of the SDAP layer device or the function of the SDAP layer device. When the SDAP header is configured, the UE may indicate the NAS reflection QoS configuration 1-bit indicator and the AS reflection QoS configuration 1-bit indicator of the SDAP header to update or reconfigure the mapping information of the QoS flows and DRBs for UL and DL. The SDAP header may include QoS flow ID information indicating QoS. QoS information can be used as data processing priority, scheduling information, etc. to support smooth services.

[0118] The main functions of NR PDCP 1d-05 and 1d-40 may include one or more of the following:

[0119] -Header compression and decompression: ROHC only

[0120] -Transfer user data

[0121] - Sequential delivery of upper layer PDUs

[0122] - Out-of-order delivery of upper layer PDUs

[0123] - Reordering of received PDCP PDUs

[0124] - Duplicate detection of lower layer SDU

[0125] -Retransmitted PDCP SDU

[0126] -Encryption and decryption

[0127] - Timer-based SDU discard in uplink

[0128] In the above, the reordering function of the NR PDCP device refers to a function of reordering PDCP PDUs received from a lower layer in sequence based on a PDCP sequence number (SN), and may include a function of delivering data to an upper layer according to the reordering, or a function of delivering data immediately regardless of the sequence. In addition, the reordering function may include a function of recording lost PDCP PDUs by reordering, a function of reporting the status of lost PDCP PDUs relative to the transmitting side, and a function of requesting retransmission of lost PDCP SDUs.

[0129] The main functions of NR RLC 1d-10 and 1d-35 may include at least one of the following functions:

[0130] -Transmit upper layer PDU

[0131] - Sequential delivery of upper layer PDUs

[0132] - Out-of-order delivery of upper layer PDUs

[0133] - Error correction via ARQ

[0134] - Concatenation, segmentation and reassembly of RLC SDU

[0135] - Re-segmentation of RLC data PDUs

[0136] - Reordering of RLC data PDUs

[0137] - Duplicate detection

[0138] -Protocol error detection

[0139] -RLC SDU discarded

[0140] -RLC reconstruction

[0141] In the above, the sequential delivery function of the NR RLC device refers to a function of sequentially delivering the RLC SDU received from the lower layer to the upper layer. When one RLC SDU is initially divided into several RLC SDUs and received, the sequential delivery function may include the following functions: reassembling and delivering the several RLC SDUs; reordering the received RLC PDUs relative to the RLC sequence number (SN) or PDCP SN; reordering and recording the lost RLC PDUs; reporting the status of the RLC PDUs lost relative to the transmitting side; requesting retransmission of the lost RLC PDUs; when there is a lost RLC SDU, sequentially delivering only the RLC SDUs before the lost RLC SDU to the upper layer; when the timer expires, even if there is a lost RLC SDU, sequentially transmitting all RLC SDUs received before the start of the predetermined timer to the upper layer; and when the predetermined timer expires, even if there is a lost RLC SDU, sequentially delivering all RLC SDUs received so far to the upper layer. In addition, the RLC PDUs may be processed in the order in which they are received (regardless of the order of the serial number and sequence number, in the order in which they arrive) and delivered to the PDCP device out of order. In the case of segmentation, segments stored in the buffer or to be received in the future may be received, reconfigured into a complete RLC PDU, processed, and then delivered to the PDCP device. The NR RLC layer may not include a cascading function, and the above function may be performed in the NR MAC layer, or may be replaced by a multiplexing function of the NR MAC layer.

[0142] In the above, the out-of-order delivery function of the NR RLC device refers to a function of delivering the RLC SDU received from the lower layer directly to the upper layer regardless of the order. When one RLC SDU is originally divided into several RLC PDUs and received, the out-of-order delivery function may include a function of reassembling and sending the several RLC PDUs, and a function of storing and recording the RLC SN or PDCP SN of the received RLC PDU to record the lost RLC PDU.

[0143] NR MAC 1d-15 and 1d-30 can be connected to several NR RLC layer devices configured in one UE, and the main functions of NR MAC may include one or more of the following functions:

[0144] - Mapping between logical channels and transport channels

[0145] -Multiplexing / demultiplexing of MAC SDU

[0146] -Dispatch information report

[0147] - Error correction through HARQ

[0148] - Priority handling between logical channels of a UE

[0149] - Priority handling between UEs through dynamic scheduling

[0150] -MBMS service logo

[0151] -Transmission format selection

[0152] -filling

[0153] NR PHY layers 1d-20 and 1d-25 can channel encode and modulate the upper layer data, and can convert the obtained data into OFDM symbols to send the OFDM symbols to the radio channel, or can demodulate and channel decode the OFDM symbols received through the radio channel to send the obtained data to the upper layer.

[0154] Figure 1E is a schematic diagram showing a structure of another next-generation mobile communication system according to an embodiment of the present disclosure.

[0155] refer to Figure 1E, a cell served by an NR gNB 1e-05 operating on a beam basis includes multiple transmission reception points (TRPs) 1e-10, 1e-15, 1e-20, 1e-25, 1e-30, 1e-35, and 1e-40. TRPs 1e-10 to 1e-40 represent blocks in which some functions of transmitting and receiving physical signals in the existing NR eNB are separated, and are composed of multiple antennas. The NR gNB 1e-05 may be represented as a central unit (CU), and the TRP may be represented as a distributed unit (DU). The functions of the NR gNB 1e-05 and the TRP may be configured by dividing each layer into PDCP / RLC / MAC / PHY layers such as 1e-45. The TRP may have only the PHY layer (1e-15 and 1e-25) and perform the functions of the PHY layer, the TRP may have only the PHY layer and the MAC layer (1e-10, 1e-35, and 1e-40) and perform the functions of the PHY layer and the MAC layer, and the TRP may have only the PHY layer, the MAC layer, and the RLC layer (1e-20 and 1e-30) and perform the functions of the PHY layer, the MAC layer, and the RLC layer. In particular, TRPs 1e-10 to 1e-40 can use beamforming technology that generates narrow beams in various directions using multiple transmit / receive antennas to send and receive data. The UE accesses NR gNB 1e-05 and external networks through TRPs 1e-10 to 1e-40. NR gNB 1e-05 collects and schedules status information, such as the UE's buffer status, available transmit power status, and channel status to serve users, and supports the connection between the UE and the core network (CN), in particular, the connection between the access and mobility management function (AMF) / session management function (SMF) 1e-50.

[0156] Figure 1F is a schematic diagram showing an example of a frame structure used by an NR system according to an embodiment of the present disclosure.

[0157] The NR system aims at a higher transmission rate than LTE and considers the scenario of operating at a high frequency to ensure a wide bandwidth. In particular, a scenario of transmitting data with a high data rate to a UE by generating a directional beam at a high frequency can be considered.

[0158] Therefore, when NR eNB or TRP 1f-01 communicates with UE 1f-71, 1f-73, 1f-75, 1f-77, and 1f-79 in a cell, a scenario in which different beams are used to perform communication can be considered. That is, in the figure, it is assumed that UE 1 (1f-71) uses beam #1 (1f-51) to perform communication, UE 2 (1f-73) uses beam #5 (1f-55) to perform communication, and UE 3, 4, and 5 (1f-75, 1f-77, and 1f-79) use beam #7 (1f-57) to perform communication.

[0159] In order to measure which beam the UE communicates with the TRP through, there is an overhead subframe (OSF) 1F-03 in time, which is sent through the OSF common overhead signal. OSF may include a primary synchronization signal (PSS) for obtaining the timing of non-orthogonal frequency division multiplexing (OFDM) symbols, a secondary synchronization signal (SSS) for detecting the cell ID, and the like. In addition, a physical broadcast channel (PBCH) containing system information, a master information block (MIB) or information necessary for the UE to access the system (for example, including the bandwidth of the downlink beam, the system frame number, etc.) may be transmitted. In addition, in OSF, the eNB sends a reference signal using a different beam for each symbol (or for several symbols). The beam index value used to distinguish the beams can be derived from the reference signal. In the figure, it is assumed that there are 12 beams from #1 (1F-51) to #12 (1F-62) sent by the eNB, and a different beam is scanned for each symbol in OSF. Each beam is sent for each symbol within the osf (e.g., beam #1 (1f-51) is sent in the first symbol 1f-31, beam #2 is sent in the second symbol 1f-32, and beam #12 is sent in the twelfth symbol 1f-42), and the UE measures the osf to measure which beam from which the signal is sent within the osf is the strongest.

[0160] In this figure, it is assumed that the corresponding OSF is repeated every 25 subframes, and the remaining 24 subframes are data subframes (hereinafter, referred to as "DSF") 1f-05, through which general data is sent and received. Therefore, according to the scheduling of the eNB, UE 3 (1f-75), UE 4 (1f-77) and UE 5 (1f-79) jointly use beam #7 (1f-11) to perform communication, UE 1 (1f-71) uses beam #1 (1f-13) to perform communication, and UE 2 (1f-73) uses beam #5 (1f-15) to perform communication. In this figure, the transmission beams #1 (1f-51) to #12 (1f-62) of the eNB are mainly schematically shown, but the reception beams of the UE for receiving the transmission beams of the eNB (for example, four beams 1f-81, 1f-83, 1f-85 and 1f-87 of UE 1f-71) can be additionally considered. In this figure, UE 1 has four beams 1f-81, 1f-83, 1f-85 and 1f-87, and beam scanning is performed to determine which beam has the best reception performance. In this case, when multiple beams cannot be used at the same time, one reception beam of each osf can be used to receive as many osfs as the number of reception beams to find the best transmission beam of the eNB and the best reception beam of the UE.

[0161] The present disclosure aims to realize transmission and reception in multiple TRPs in order to improve MIMO operation in the next generation mobile communication system. The case where multiple TRPs are configured in one service cell may be referred to as "intra-cell multi-TRPs", and the case where TRPs capable of transmitting and receiving TRPs associated with different service cells are configured may be referred to as "inter-cell multi-TRPs". The functions that are not supported in the existing NR system and are additionally required are summarized in the following Figure 1G and 1H middle.

[0162] Figure 1G It is a schematic diagram showing a method for implementing PUCCH transmission for each of multiple TRPs configured in an NR system according to an embodiment of the present disclosure.

[0163] refer to Figure 1G , for PDSCH resources transmitted in each TRP, independent PUCCH and HARQ ACK / NACK transmissions are possible. For reference, a structure in which multiple TRPs are included in one service cell or a structure in which each TRP is regarded as a service cell can be considered to support corresponding operations, and in the present disclosure, it is assumed and will be described that a structure in which multiple TRPs are included in one service cell.

[0164] The eNB can perform data transmission and reception through TRP 1g-05 and 1g-10 present in one service cell or different service cells. TRP consists of an RF part and a physical domain part, and is a node that mainly performs transmission and reception functions. When multiple TRPs are configured in one service cell, general configuration information about the service cells is sent together, and only some RF / physical domain related parameters have differences. The HARQ entity 1g-15, MAC entity 1g-20, RLC entity 1g-25 and PDCP entity 1g-30 of the eNB are generally used for TRP1 and TRP2. This means that one eNB is responsible for scheduling and data processing of multiple TRPs (TRP 1 1g-05 and TRP21g-10). UE 1g-35 has HARQ entity 1g-40, MAC entity 1g-45, RLC entity 1g-50 and PDCP entity 1g-55, including a protocol stack as described above.

[0165] In particular, UE 1g-35 can perform UL / DL transmission / reception using TRP1 1g-05 and TRP2 1g-10, respectively. As in 1g-60, TRP1 can perform DCI (PDCCH) reception and PDSCH reception through a dedicated DL channel, and as in 1g-65, TRP1 can perform HARQ ACK / NACK transmission and PUCCH transmission (UCI transmission) of the corresponding PDSCH reception. Similarly, as in 1g-70, the UE can receive DCI (PDCCH) and PDSCH from TRP2 through a dedicated DL channel, and as in 1g-75, can send HARQ ACK / NACK of the corresponding PDSCH reception and send PUCCH (UCI transmission) of TRP1.

[0166] Figure 1H is a schematic diagram showing a method for implementing reception of a physical downlink shared channel (PDSCH) from each of a plurality of TRPs configured in an NR system in the same time unit (e.g., time slot or symbol) according to an embodiment of the present disclosure.

[0167] refer to Figure 1H In the existing NR system, even if multiple TRPs are configured, PUCCH transmission is only possible through one TRP. This is because only one activation for PUCCH resources is defined, and even if multiple TRPs are defined in the existing NR system, the UE cannot simultaneously receive multiple PDSCHs from the TRP at one time point (time slot or symbol). This is because a series of operations for each of PDCCH reception, PDSCH reception, and PUCCH transmission need to be performed sequentially. In the present disclosure, a method for supporting simultaneous reception and processing of PDSCH through two TRPs at the same time point (time slot or symbol) is involved.

[0168] In the existing system, PUCCH transmission in TRP2 1h-10 is not allowed for TRP1 1h-05 and TRP2 1h-10. However, when Figure 1G When the function is in, with respect to the actual TRP1 1h-05, PDCCH reception (1h-25), PDSCH reception (1h-35) after K0 (1h-30), and PUCCH transmission (1h-45) after K1 (1h-40) are possible. With respect to TRP2 1h-10, PDCCH reception (1h-50), PDSCH reception (1h-60) after K0 (1h-55), and PUCCH transmission (1h-70) after K1 (1h-65) are possible. Here, PDSCH reception (1h-60) in TRP2 1h-10 cannot be performed at the same time (time slot or symbol) as PDSCH reception (1h-35) in TRP11h-05.

[0169] In the new function applied to the present disclosure, PDCCH reception (1h-75) of TRP 1h-15, PDSCH reception (1h-85) after K0 (1h-80), and PUCCH transmission (1h-95) after K1 (1h-90) are possible with respect to TRP1 1h-15 and TRP2 1h-20. PDCCH reception (1h-100), PDSCH reception (1h-110) after K0 (1h-105), and PUCCH transmission (1h-120) after K1 (1h-115) are possible with respect to TRP2 1h-20. Here, PDSCH reception (1h-110) in TRP2 1h-20 is performed at the same time (time slot or symbol) as PDSCH reception (1h-85) in TRP1 1h-15.

[0170] Figure 1IA and Figure 1IB It is a schematic diagram showing the overall impact on PDCCH sent from multiple TRPs, the method of activating downlink candidate beam groups, and the MAC CE structure according to various embodiments of the present disclosure.

[0171] refer to Figure 1IA, in the existing NR system, the TCI state indication process for PDCCH reception can be defined as follows. First, the eNB can configure the candidate TCI state in the PDCCH-Config to a maximum of 64 beams for each control resource set (CORESET) through an RRC message. For reference, the TCI state ID is defined with reference to the TCI state value configured in the PDSCH (there are a maximum of 128 TCI states). After the above RRC configuration, the eNB indicates the TCI state ID for PDCCH reception in a specific CORESET through a MAC CE. Currently, three CORESETs can be configured for each BWP, and since a serving cell can be configured with a maximum of four BWPs, the CORESET ID can also be configured from 0 to 11. The above content is for PDCCH configuration and CORESET configuration when there is only one TRP in a serving cell, but in the case of supporting multiple TRPs, namely TRP1 and TRP2, in the configuration for PDCCH delivered by TRP2, in particular, the CORESET configuration can be different from TRP1. To this end, it is necessary to increase the number of previously configurable CORESETs from 3 per BWP to 5 per BWP. The increase in the number of CORESETs per BWP may result in an increase in the number of CORESETs configured in all serving cells (e.g., 20), or the number of CORESETs configured in all serving cells may be fixed to 12 as before. Based on the above determination, the size of the CORESET ID may be changed, the number of bits used to indicate this may be changed, and the structure of the TCI status indication MAC CE of the PDCCH may be changed.

[0172] In the following, the impact of introducing multiple TRPs on the TCI status indication MAC CE of PDCCH will be described.

[0173] A. In a system supporting multiple TRPs, the TCI status indication MAC CE received by PDCCH has the following options:

[0174] - Option A (If you do not need to increase the size of the CORESET ID for each unit, Figure 1IA ):

[0175] *Maintain the existing RRC configuration and MAC CE format, and activate (transmit) two MAC CEs for TRP1 and TRP2. In this case, the UE performs PDCCH reception from TRP1 and TRP2 while monitoring the twice indicated beams (TCI state).

[0176] *The structure of the existing TCI status indication MAC CE received by PDCCH is as follows:

[0177] **Serving cell ID (5 bits, 1i-05)

[0178] **CORESET ID (4 bits, 1i-10)

[0179] **TCI status ID (7 bits, 1i-15)

[0180] - Option B (If it is necessary to increase the size of the CORESET ID per cell, Figure 1IB ): Introduce a new MAC CE for TRP2 (allocate a new LCID)

[0181] *Option B-1: Extend the CORESET ID to 5 bits and design a new MAC CE

[0182] **Serving cell ID (5 bits, 1i-25)

[0183] **CORESET ID (5 bits, 1i-35)

[0184] **TCI status ID (7 bits, 1i-45)

[0185] ** Reserved bits (included for byte alignment, 1i-20, 1i-30, and 1i-40)

[0186] *Option B-2: Use the existing MAC CE format as is and use a new logical channel identifier (LCID) to distinguish the MAC CE of TRP2

[0187] **Serving cell ID (5 bits, 1i-50)

[0188] **CORESET ID (4 bits, 1i-55)

[0189] **TCI status ID (7 bits, 1i-60)

[0190] *Option B-3: Assign a separate virtual serving cell ID to TRP2 (Assign a separate serving cell ID to SpCellConfig and SCellConfig for TRP2)

[0191] **Method 1: It can be solved by eNB operation through the existing MAC CE structure, without extending the SCellID; it is applicable even if the CORESET ID (1i-70) is not extended, and it is available even if it is extended by 1 bit. In this case, the MAC CE can consist of 5 serving cell ID bits (1i-65), CORESET ID 4 bits (1i-70) and TCI state ID 7 bits (1i-75).

[0192] **Method 2: In the case of extended SCell ID, an explanation is added that the increased SCell ID should be allocated only to TRP2, and a 1-bit serving cell ID needs to be added in MAC CE. In this case, MAC CE can consist of 6 bits of serving cell ID (1i-85), 4 bits of CORESET ID (1i-95), 7 bits of TCI state ID (1i-105), and other reserved bits (1i-80, 1i-90, and 1i-100).

[0193] **Method 3: In the case of extended SCell ID, an explanation is added that the increased SCell ID should be allocated only to TRP2, and a 1-bit serving cell ID and a 1-bit CORESET ID need to be added to the MAC CE. In this case, the MAC CE can consist of a 6-bit serving cell ID (1i-115), a 5-bit CORESET ID (1i-125), a 7-bit TCI state ID (1i-135), and other reserved bits (1i-110, 1i-120, and 1i-130).

[0194] When the above proposed options are applied, the method of indicating the TCI state (beam) when receiving the PDCCH for each TRP may change. The following Table 1 shows the expected changes in RRC ASN.1 for reference.

[0195] [Table 1]

[0196]

[0197]

[0198]

[0199] Figure 1JA and Figure 1JB It is a schematic diagram showing the overall impact on PDSCH sent from multiple TRPs, a method for activating downlink candidate beam groups, and a MAC CE structure according to various embodiments of the present disclosure.

[0200] refer to Figure 1JA and Figure 1JB , the entire process for indicating the beam of a downlink signal sent to a PDSCH in the NR system will be described as follows.

[0201] The UE may be configured with a beam direction through which the channel state information reference signal (CSI-RS) resources are transmitted for the connected eNB and TRP. The beam configuration may be applied to the beams transmitting all transmission resources transmitted from the PDSCH, and the process is as follows.

[0202] Operation 1: Configure the TCI state in PDSCH-Config for each BWP of the serving cell through RRC configuration (up to 128 beams can be configured)

[0203] Operation 2: For the TCI state, that is, the beam through which the PDSCH configured in the RRC message is sent, the beam candidate group to be activated to the UE is indicated by MAC CE (up to 8 beams, that is, the TCI state can be activated). The purpose of MAC CE can be understood as a process for selecting a candidate beam, which can be dynamically indicated by DCI during the TCI state configured by RRC, which can reduce the TCI state that the UE must manage, and can reduce the number of bits indicated by DCI.

[0204] Operation 3: Indicate a specific beam from the candidate beams indicated by the MAC CE through a DCI indicator (the indicator consists of 3 bits)

[0205] In particular, the TCI state activation / inactivation MAC CE for PDSCH reception defined in operation 2 is Figure 1JA and have the following values.

[0206] * Reserved bits (included for byte alignment, 1j-05)

[0207] * Serving cell ID (5 bits, 1j-10)

[0208] *BWP ID (2 bits, 1j-15)

[0209] *TCI status bitmap (1 bit up to 128 bitmaps, 1j-20)

[0210] In the present disclosure, it is determined whether the use of the existing MAC CE is applied to the multi-TRP system as it is, and in addition, the following additional options are proposed.

[0211] - Option B (supported by NW (network) operations, no changes to existing structures):

[0212] *RRC configuration and TCI state configuration of the existing TCI state of MAC CE include both TRP1 and TRP2, and activate the TCI states activated in TRP1 and TRP2 by DCI delivered from each PDCCH, respectively.

[0213] *The usage is the same as that in the existing MAC CE structure.

[0214] ** Reserved bits (included for byte alignment, 1j-25)

[0215] **Serving cell ID (5 bits, 1j-30)

[0216] **BWP ID (2 bits, 1j-35)

[0217] **TCI status bitmap (one status is represented by 1 bit, up to 128 bitmaps, 1j-40)

[0218] - Option C (Introducing separate TCI status MAC CE for TRP2):

[0219] *Option C-1: Change the existing R bit to an indicator (I) indicating TRP2

[0220] **TRP2 indicator (1 bit, 1j-45)

[0221] **Serving cell ID (5 bits, 1j-50)

[0222] **BWP ID (2 bits, 1j-55)

[0223] **TCI status bitmap (one status is represented by 1 bit, up to 128 bitmaps, 1j-60)

[0224] * Option C-2: Change the existing R bit to an indicator (I) indicating the presence of additional extensions

[0225] **Indicator indicating the presence of additional extensions (1 bit, 1j-65)

[0226] **Serving cell ID (5 bits, 1j-70)

[0227] **BWP ID (2 bits, 1j-75)

[0228] **TCI status bitmap (one status is represented by 1 bit, up to 128 bitmaps, 1j-80)

[0229] ** Reserved bits (included for byte alignment, 1j-85)

[0230] **TRP ID (e.g., 2 bits, determined by the number of TRPs introduced later, 1j-90)

[0231] * Option C-3: Introduce new LCID for TRP2 and reuse existing MAC CE format

[0232] ** Reserved bits (included for byte alignment, 1j-95)

[0233] **Serving cell ID (5 bits, 1j-100)

[0234] **BWP ID (2 bits, 1j-105)

[0235] **TCI status bitmap (one status is represented by 1 bit, up to 128 bitmaps, 1j-110)

[0236] * Option C-4: Introduce new LCID for TRP2 and design new MAC CE (consider future versions)

[0237] **Serving cell ID (5 bits, 1j-120)

[0238] **BWP ID (2 bits, 1j-125)

[0239] ** Reserved bits (included for byte alignment, 1j-115, 1j-130)

[0240] **TRP ID (e.g., 2 bits, determined by the number of TRPs introduced later, 1j-135)

[0241] **TCI status bitmap (one status is represented by 1 bit, up to 128 bitmaps, 1j-140)

[0242] Figure 1K It is a schematic diagram showing the overall effect of enabling UE 1k-15 to send PUCCH to multiple TRPs 1K-05 and 1k-10 and a method of configuring the UE according to an embodiment of the present disclosure.

[0243] refer to Figure 1K , a method for implementing PUCCH transmission through each TRP 1K-05 or 1k-10 in a case where multiple TRPs 1K-05 and 1k-10 are configured in different service cells in addition to the intra-cell multi-TRP operation in which multiple TRPs 1k-05 and 1k-10 are configured in a service cell will be described.

[0244] In the existing NR system, transmission beam configuration associated with PUCCH resources for multiple TRPs 1k-05 and 1k-10 can be performed simultaneously in one PUCCH-Config. In other words, separate PUCCH resources 1k-30 and 1k-35 for TRP1 1k-05 and TRP2 1k-10 can be configured in the PUCCH-Config in the network, and the beam through which the PUCCH resources 1k-30 and 1k-35 applied to TRP1 1k-05 and TRP2 1k-10 are transmitted can be indicated by appropriate configuration of spatialRelationInfoToAddModList present in PUCCH-Config.

[0245] In the case of PDSCH-Config, TRP1 1k-05 and TRP2 1k-10 can also be commonly applied (configured by service cell), and multiple TRPs 1k-05 and 1k-10 can be configured for the service cell in which the PUCCH SCell is configured. Currently, in addition to the PCell / PSCell (primary and secondary cell group (SCG) cell) in a cell group, a PUCCH SCell can also be configured. In an intra-cell multi-TRP system, PUCCH transmission (1k-30 and 1k-35) can be configured in multiple TRPs 1k-05 and 1k-10 in one service cell even if the corresponding conditions are applied as is. In this case, it is also possible if the corresponding service cell is an sPCell (PCell / PSCell) or a PUCCH SCell. However, in an inter-cell multi-TRP system, for PUCCH transmission of TRP2 1k-10 (1k-35), it is necessary to configure an SCell capable of two PUCCH transmissions (1k-30 and 1k-35). There are two possible solutions.

[0246] *Option 1: Configure sPCell for TRP1 + configure PUCCH SCell for TRP2

[0247] **Maintain current operation by adding the above constraints (only one PUCCH SCell can be configured)

[0248] *Option 2: PUCCH SCell1 of TRP1 + PUCCH SCell2 of TRP2

[0249] **Under current conditions (only one PUCCH SCell can be configured), the operation is not possible, so two or more PUCCH SCells must be configured.

[0250] **In this case, even if the serving cells of TRP1 and TRP2 are not sPCell (PCell / PSCell), simultaneous PUCCH transmission in TRP is possible.

[0251] Table 2 below shows the RRC structure for configuring the PUCCH SCell in the existing system.

[0252] [Table 2]

[0253]

[0254] Figure 1LA and Figure 1LB It is a schematic diagram showing a separate PUCCH configuration for implementing PUCCH transmission to multiple TRPs, a method for activating a beam for transmitting the PUCCH configuration, and a MAC CE structure according to various embodiments of the present disclosure.

[0255] refer to Figure 1LA and Figure 1LB The whole process of configuring PUCCH resources in the NR system and indicating the beam of the uplink signal transmitting the corresponding resources is described below.

[0256] A plurality of PUCCH resources may be configured by PUCCH-Config for the eNB and TRP to which the UE is connected, and beam configuration information through which the corresponding PUCCH resources are transmitted may be configured as PUCCH-SpatialRelationInfo. For reference, for TRP2, the number of PUCCH resources and PUCCH-SpatialRelationInfo that can currently be configured may be additionally increased, or one of the existing values ​​may be distributed and used in a manner implemented by the eNB. The operation of actually activating the PUCCH resources and PUCCH-SpatialRelationInfo configured in the RRC message is performed by the PUCCH spatial relationship MAC CE, and the detailed structure of the existing MAC CE is as follows Figure 1LA as shown, and have the following values.

[0257] ** Reserved bits (included for byte alignment, 1l-05, 1l-20)

[0258] ** Serving cell ID (5 bits, 11-10)

[0259] ** BWP ID (2 bits, 11-15)

[0260] ** PUCCH resource ID (7 bits, 11-25)

[0261] ** Spatial relationship bitmap (1 bit only enables one of up to 8 bitmaps, 11-30)

[0262] Even if the current RRC structure related to PUCCH configuration is applied as it is, it is necessary to change the entire process in which two PUCCH transmissions can be delivered in one serving cell. However, in the current MAC CE structure, there is no link information indicating which TRP's MAC CE the current MAC CE structure is. Even RRC, whether TRP2 requires additional PUCCH resource configuration, and whether TRP2 requires PUCCH-SpatialRelationInfo, or whether TRP 1 and TRP2 reuse the existing structure and use the existing structure through coordination has not yet been determined. It may be necessary to expand the size of the PUCCH resources to be configured and the size of PUCCH-SpatialRelationInfo (or configure a separate field for TRP2).

[0263] In the following, we will base on Figure 1LB A method of changing RRC and MAC CE for PUCCH transmission in TRP2 proposed in the present disclosure is described.

[0264] - Option B-1: The existing MAC CE structure is applied to both TRP1 and TRP2 and used.

[0265] *NW allocates PUCCH resource ID and PUCCH-SpatialRelationInfoId to apply to both TRP1 and TRP2

[0266] *Activate PUCCH resources of TRP1 and TRP2 by sending two MAC CEs

[0267] *MAC CE detailed structure

[0268] ** Reserved bits (included for byte alignment, 1l-35, 1l-50)

[0269] **Serving cell ID (5 bits, 11-40)

[0270] **BWP ID (2 bits, 11-45)

[0271] **PUCCH resource ID (7 bits, 11-55)

[0272] **Spatial relationship bitmap (1 bit, only one bit is activated out of a maximum of 8 bitmaps, 11-60)

[0273] In the following, for the proposed options, it is characterized in that a separate MAC CE is introduced for TRP2. In addition, all options that increase the size of PUCCH-SpatialRelationInfoId can be applied to the following options. That is, in the current structure, the corresponding PUCCH-SpatialRelationInfoId is indicated as 8 bits, but it can be extended to 16 bits. In this case, a description of applying IDs 8 to 15 to TRP2 can be added.

[0274] - Option B-2: Reuse the existing MAC CE, and change R bits and use them as an indicator (I) indicating TRP2.

[0275] *MAC CE detailed structure

[0276] ** Reserved bits (included for byte alignment, 1l-65, 1l-80)

[0277] **Service cell ID (5 bits, 11-70)

[0278] **BWP D (2 bits, 11-75)

[0279] **PUCCH resource ID (7 bits, 11-85)

[0280] **Spatial relationship bitmap (bits, only one bitmap is activated out of a maximum of 8, 11-90)

[0281] - Option B-3: For reusing the existing MAC CE, the length of the PUCCH resource ID is extended by 1 bit by extending the R bit (the added PUCCH resources are exclusively allocated to TRP2, or the PUCCH resources of TRP2 can be identified according to the configuration)

[0282] *MAC CE detailed structure

[0283] ** Reserved bits (included for byte alignment, 11-95)

[0284] **Service cell ID (5 bits, 11-100)

[0285] **BWP ID (2 bits, 11-105)

[0286] **PUCCH resource ID (8 bits, 11-110)

[0287] **Spatial relationship bitmap (1 bit, only one of the maximum 8 bitmaps is activated, 11-115)

[0288] - Option B-4: Introduce a new LCID and apply it to a new MAC CE (the format uses the existing MAC CE format - TRP2 only)

[0289] *MAC CE detailed structure

[0290] ** Reserved bits (included for byte alignment, 11-120, 11-135)

[0291] **Service cell ID (5 bits, 11-125)

[0292] **BWP ID (2 bits, 11-130)

[0293] **PUCCH resource ID (7 bits, 11-140)

[0294] **Spatial relationship bitmap (1 bit, only one of up to 8 bitmaps is activated, 11-145)

[0295] -Option B-5: Introduce a new LCID and apply it to the new MAC CE (considering the increase in the number of TRPs in the future, generate a new format including TRP ID)

[0296] *MAC CE detailed structure

[0297] ** Reserved bits (included for byte alignment, 1l-150, 1l-165)

[0298] **Service cell ID (5 bits, 11-155)

[0299] **BWP ID (2 bits, 11-160)

[0300] **TRP ID (e.g. 2 bits, may be larger, 11-170)

[0301] **PUCCH resource ID (8 bits, 11-175)

[0302] **Spatial relationship bitmap (1 bit, only activates one of up to 8 bitmaps, 11-180)

[0303] For reference, in case the proposed disclosure is applied, changes of RRC ASN.1 are shown in Table 3 below.

[0304] [Table 3]

[0305]

[0306]

[0307]

[0308]

[0309] Figure 1M It is a schematic diagram showing the overall operation of a UE for independently performing PDCCH / PDSCH reception and PUCCH transmission through multiple TRPs according to an embodiment of the present disclosure.

[0310] refer to Figure 1M , the UE 1m-01 in the idle mode RRC_IDLE camps on the eNB1m-02 (1m-05) while searching for a suitable cell, and then performs access to the eNB 1m-02 for reasons such as the presence of data to be transmitted (1m-10). In the idle mode, because the UE is not connected to the network to save power, data cannot be transmitted, and for data transmission, it is necessary to switch to the connected mode RRC_CONNECTED. In addition, camping means that the UE stays in the corresponding cell and receives a paging message to determine whether data is arriving through the downlink. When the UE successfully accesses the eNB 1m-02, the UE switches to the connected mode RRC_CONNECTED, and the UE in the connected mode can send and receive data to and from the eNB (1m-15).

[0311] In the RRC connected state, the base station transmits configuration information (1m-20) related to multiple TRPs 1m-03 and 1m-04 to the UE through an RRC message. The RRC message includes configuration information (PDCCH-Config, PDSCH-Config) for reception through PDCCH and PDSCH, and may include BWP configuration, CORESET configuration, scrambling configuration, TCI state configuration, etc. In particular, TCI state-related configuration can be performed for each BWP and each service cell, and can be included in PDCCH-Config and PDSCH-Config, respectively, and the beam configuration for PUCCH resource transmission is also included in the PUCCH configuration. For reference, in Rel-15, the eNB configures up to 64 downlink beams for transmission to the UE via PDCCH as an RRC message, and one of the beams actually used is indicated by MAC CE. In addition, the base station also includes operations for configuring and indicating downlink beams for transmission via PDSCH. Under certain conditions, a downlink beam for transmission through PDCCH can be used instead of a downlink beam for transmission through PDSCH. Under the above conditions, a case is given where the processing time for switching from a downlink beam for PDCCH to a downlink beam for PDSCH is shorter than the required processing time. Additionally, among the configured PUCCH resources, one resource is activated together with the beam information, and one of the resources is sent to the MAC CE. When the corresponding operation is configured, the UE and the eNB are in a state where the configuration of multiple TRPs is completed and transmission / reception can be performed through TRP21m-04.

[0312] In operation 1m-25, the eNB may indicate activation of a function requiring activation of TRP operation through L1 / L2 signaling relative to the configuration of the TRP configured as RRC configuration information. The L1 signaling indicates DCI, and the L2 signaling indicates MAC CE. For example, a corresponding MAC CE may be sent to activate the PDCCH TCI state of TRP1 and TRP2 (e.g., Figure 1IA and Figure 1IB ), and sequentially sends the corresponding MAC CE and DCI to activate the PDSCH TCI state (for example, Figure 1JA and Figure 1JB In addition, the corresponding MACCE may be delivered (eg, Figure 1LA and Figure 1LB ) is used for PUCCH resource activation and beam indication of TRP1 and TRP2.

[0313] In operation 1m-30, the corresponding transmission / reception resources can be transmitted in each TRP (TRP1, TRP2) through the downlink beam (TCI state) and the uplink beam (PUCCH resource transmission beam), where activation is indicated in operation 1m-35. The UE performs uplink and downlink data reception through the beam configured for communication with the eNB. In operation 1m-35, the eNB may resend the MAC CE for the purpose of updating the previously sent MAC CE. The activated and deactivated beams may be updated or deactivated. Alternatively, the beam may be changed through the DCI in the corresponding operation, and in operation 1m-40, the UE may change and apply the active beam information in each TRP according to the L1 / L2 signaling received from the eNB.

[0314] Figure 1N is a schematic diagram illustrating the overall operation of a UE according to an embodiment of the present disclosure.

[0315] refer to Figure 1N , in operation 1n-05, the UE performs an RRC connection process with the eNB and transitions to an RRC connected state. In operation 1n-10, the UE receives configuration information related to multiple TRPs from the eNB through an RRCReconfiguration message. The RRC message includes configuration information (PDCCH-Config, PDSCH-Config) for reception through PDCCH and PDSCH, and in detail, may include BWP configuration, CORESET configuration, scrambling configuration, TCI state configuration, and the like. In particular, TCI state-related configuration is performed for each BWP and each serving cell, and is included in PDCCH-Config and PDSCH-Config, respectively, and the beam configuration for PUCCH resource transmission is also included in PUCCH-Config.

[0316] In operation 1n-15, the UE may receive an instruction from the eNB through L1 / L2 signaling to activate multiple TRP functions that need to be activated and are configured as RRC configuration information. For example, a corresponding MAC CE may be sent to activate the PDCCH TCI states of TRP1 and TRP2 (e.g., Figure 1IA and Figure 1IB ), and sequentially sends the corresponding MAC CE and DCI to activate the PDSCH TCI state (for example, Figure 1JA and Figure 1JB In addition, a corresponding MAC CE (eg, Figure 1LA and Figure 1LB ) is used for PUCCH resource activation and beam indication of TRP1 and TRP2.

[0317] If the L1 / L2 signaling received by the UE in operation 1n-20 is beam activation information for multiple TRPs (for PDCCH, PDSCH or PUCCH), the corresponding transmission / reception resources can be transmitted in each TRP (TRP 1 and TRP 2) by indicating the activated downlink beam (TCI state) and uplink beam (PUCCH resource transmission beam). The UE performs uplink and downlink data reception through the beam configured to communicate with the eNB.

[0318] Fig.1O is a schematic diagram showing the overall operation of an eNB to which an embodiment of the present disclosure is applied.

[0319] refer to Fig.1O , in operation 1o-05, the eNB establishes an RRC connection state with the UE, requests UE capabilities from the UE in operation 1o-10, and receives corresponding UE capability information. The eNB can analyze the UE capabilities received in the above operations to determine whether the corresponding UE has the ability to operate in multiple TRPs, and can confirm whether the eNB has configured the corresponding functions (confirm whether the configuration of multiple TRPs is possible or whether the requirements for corresponding configuration are met). After completing the above confirmation, in operation 1o-15, the eNB provides the UE with configuration information related to multiple TRPs supported by the UE based on the UE capabilities and TRP through an RRC message. If the UE does not have the corresponding capabilities or the eNB determines that the configuration is not required, configuration information for one basic TRP operation can be provided instead of providing the configuration information required for operations in multiple TRPs.

[0320] In operation 1o-20, the eNB indicates to the DCI or MAC CE a beam or beam group that needs to be actually used for uplink and downlink (PDCCH, PDSCH or PDSCH) data transmission in the candidate activated beams for uplink and downlink or the beam group configured to the RRC. Next, in operation 1o-25, downlink data transmission with the UE is performed through the configured beam direction.

[0321] Figure 1P is a block diagram showing the internal structure of a UE to which the present disclosure is applied.

[0322] refer to Figure 1P , the UE includes a radio frequency (RF) processor 1p-10, a baseband processor 1p-20, a storage unit 1p-30 and a controller 1p-40.

[0323] The RF processor 1p-10 performs functions such as frequency conversion and amplification of signals for sending and receiving signals through a wireless channel. The RF processor 1p-10 up-converts the baseband signal provided by the baseband processor 1p-20 to an RF band signal, and transmits the obtained signal through an antenna, and the RF band signal received by the antenna is down-converted to a baseband signal. For example, the RF processor 1p-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), etc. In the accompanying drawings, only one antenna is shown, but the UE may include multiple antennas. In addition, the RF processor 1p-10 may include multiple RF chains. In addition, the RF processor 1p-10 may perform beamforming. For beamforming, the RF processor 1p-10 may adjust the phase and amplitude of each of the signals sent / received by multiple antennas or antenna elements. In addition, when performing MIMO operation, the RF processor may perform MIMO and may receive multiple layers.

[0324] The baseband processor 1p-20 converts between baseband signals and bit streams according to the physical layer standard of the system. For example, when sending data, the baseband processor 1p-20 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when receiving data, the baseband processor 1p-20 recovers the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1p-10. For example, in the case of a non-orthogonal frequency division multiplexing (OFDM) scheme, when sending data, the baseband processor 1p-20 generates complex symbols by encoding and modulating the transmitted bit stream, maps the complex symbols to subcarriers, and then configures the OFDM symbols through an inverse fast Fourier transform (IFFT) operation and a cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processor 1p-20 divides the baseband signal provided from the RF processor 1p-10 in units of OFDM symbols, recovers the signal mapped to the subcarrier through a fast Fourier transform (FFT) operation, and then recovers the received bit stream through demodulation and decoding.

[0325] The baseband processor 1p-20 and the RF processor 1p-10 send and receive signals as described above. Therefore, the baseband processor 1p-20 and the RF processor 1p-10 can be referred to as a transmitter, a receiver, a transceiver or a communication unit. In addition, at least one of the baseband processor 1p-20 and the RF processor 1p-10 may include a plurality of communication modules to support a variety of different radio access technologies. In addition, at least one of the baseband processor 1p-20 and the RF processor 1p-10 may include different communication modules to process signals of different frequency bands. For example, different radio access technologies may include wireless LAN (e.g., IEEE802.11), cellular networks (e.g., LTE), etc. In addition, different frequency bands may include ultra-high frequency (SHF) (e.g., 2.NRhz, NRHz) bands and millimeter wave (e.g., 60GHz) bands.

[0326] The storage unit 1p-30 stores data such as basic programs, applications, and configuration information for UE operation. In particular, the storage unit 1p-30 can store information related to a second access node that performs wireless communication using a second radio access technology. In addition, the storage unit 1p-30 provides the stored data according to a request of the controller 1p-40.

[0327] The controller 1p-40 controls the overall operation of the UE. For example, the controller 1p-40 sends and receives signals through the baseband processor 1p-20 and the RF processor 1p-10. In addition, the controller 1p-40 writes and reads data in the storage unit 1p-40. To this end, the controller 1p-40 may include at least one processor. For example, the controller 1p-40 may include a communication processor (CP) that controls communication and an application processor (AP) that controls high layers such as applications. The controller 1p-40 may also include a multi-connection processor 1p-42 for supporting multiple connections.

[0328] Figure 1Q is a block diagram showing the configuration of an NR eNB according to an embodiment of the present disclosure.

[0329] refer to Figure 1Q , the eNB includes an RF processor 1q-10, a baseband processor 1q-20, a backhaul communication unit 1q-30, a storage unit 1q-40 and a controller 1q-50.

[0330] The RF processor 1q-10 transmits and receives signals through a wireless channel, such as frequency conversion and amplification of signals. The RF processor 1q-10 up-converts the baseband signal provided by the baseband processor 1q-20 into an RF band signal, transmits the obtained signal through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processor 1q-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Figure 1Q In the figure, only one antenna is shown, but the first access node may include multiple antennas. In addition, the RF processor 1q-10 may include multiple RF chains. In addition, the RF processor 1q-10 can perform beamforming. For beamforming, the RF processor 1q-10 can adjust the phase and amplitude of each of the signals sent and received through multiple antennas or antenna elements. The RF processor can perform downlink MIMO operations by sending one or more layers.

[0331] The baseband processor 1q-20 converts between a baseband signal and a bit stream according to the physical layer standard of the first radio access technology. For example, when sending data, the baseband processor 1q-20 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when receiving data, the baseband processor 1q-20 recovers the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 1q-10. For example, in the case of the OFDM scheme, when sending data, the baseband processor 1q-20 generates complex symbols by encoding and modulating the transmitted bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols through IFFT operations and CP insertion. In addition, when receiving data, the baseband processor 1q-20 divides the baseband signal provided from the RF processor 1q-10 in units of OFDM symbols, recovers the signal mapped to the subcarriers through FFT operations, and then recovers the received bit stream through demodulation and decoding. The baseband processor 1q-20 and the RF processor 1q-10 send and receive signals as described above. Therefore, the baseband processor 1q-20 and the RF processor 1q-10 can be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

[0332] The backhaul communication unit 1q-30 provides an interface for performing communication with other nodes in the network. The backhaul communication unit 1q-30 converts a bit stream sent from the master eNB to other nodes (e.g., secondary eNB, core network, etc.) into a physical signal, and converts a physical signal received from other nodes into a bit stream.

[0333] The storage unit 1q-40 stores data such as basic programs, applications, and configuration information for the operation of the master eNB. In particular, the storage unit 1q-40 may store information about bearers allocated to connected UEs, measurement results reported from connected UEs, and the like. In addition, the storage unit 1q-40 may store information as a criterion for determining whether to provide or stop multiple connections to the UE. In addition, the storage unit 1q-40 provides the stored data according to a request of the controller 1q-50.

[0334] The controller 1q-50 controls the overall operation of the master eNB. For example, the controller 1q-50 sends and receives signals through the baseband processor 1q-20 and the RF processor 1q-10 or through the backhaul communication unit 1q-30. The controller 1q-50 writes and reads data in the storage unit 1q-40. To this end, the controller 1q-50 may include at least one processor. The controller 1q-50 may also include a multi-connection processor 1q-52 for supporting multiple connections.

[0335] Second embodiment

[0336] In the present disclosure, a method for improving existing operations is considered with respect to a TCI state used when indicating a beam used when receiving resources for a PDSCH sent to a UE in a next-generation mobile communication system. The method used in the related art to indicate a downlink beam is to indicate a beam between a TRP and a UE, which means indicating a beam transmitted from a specific BWP belonging to a service cell. Hereinafter, in an embodiment of the present disclosure, a method for simultaneously updating beam information is proposed, and the beam information is applied to the reception of a PDSCH configured in multiple service cells and multiple BWP schemes of corresponding cells. Therefore, the delay time for applying the corresponding configuration can be reduced, and the signaling overhead can be reduced for this purpose.

[0337] Figure 2A is a schematic diagram showing an overall process for indicating a beam of a downlink signal sent from an NR system to a PDSCH according to an embodiment of the present disclosure.

[0338] refer to Figure 2A, in the NR system, it is designed to perform data transmission / reception between the UE and the eNB using a directional beam. As a feature of data communication through a directional beam, a high data rate can be supported by a wide bandwidth and using high-frequency resources, on the other hand, there may be a limitation that the beam direction must be well configured. In the NR system, basically, in the initial access phase, the UE measures the synchronization signal through the synchronization signal (SS) / PBCH block (SSB), and can perform data transmission / reception by detecting the beam direction of the corresponding synchronization signal. Thereafter, the eNB configures up to 64 downlink beams for transmission to the UE through the PDCCH as an RRC message, wherein the beam actually used is indicated by the MAC CE. In addition, the eNB also includes an operation of configuring and indicating a downlink beam for transmission through the PDSCH. Under certain conditions, a downlink beam for transmission through the PDCCH may be used instead of a downlink beam for transmission through the PDSCH. Under the above conditions, a case is given where the processing time for switching from a downlink beam for PDCCH to a downlink beam for PDSCH is shorter than the required processing time.

[0339] UE 2a-20 may be configured with a beam direction (2a-06 to 2a-10) by which CSI-RS resource 2a-15 is sent to the connected eNB and TRP 2a-05. Beam configuration may be applied to the beams that transmit all transmission resources sent from PDSCH. The process is as follows:

[0340] 1. Operation 2a-25: Configure TCI state in PDSCH-Config for each BWP of the serving cell via RRC configuration (up to 128 beams can be configured in Rel-15)

[0341] 2. Operation 2a-30: For the TCI state, i.e., the beam through which the PDSCH configured in the RRC message is sent, the beam candidate group to be activated to the UE is indicated by MAC CE (in Rel-15, up to 8 beams may be activated, i.e., TCI state). The purpose of MAC CE can be understood as a process for selecting candidate beams that can be dynamically indicated by DCI during the TCI state configured by RRC, and reducing the TCI state that the UE must manage, as well as reducing the number of bits indicated by DCI.

[0342] 3. Operation 2a-35: A specific beam among the candidate beams indicated by the MAC CE is indicated by an indicator of the DCI (in Rel-15, it consists of 3 bits)

[0343] The actual beam configuration configured and indicated in operations 2a-25 and 2a-30 is performed for each BWP. For example, the entire operation is applied to one service cell (or TRP) and one BWP belonging to the corresponding cell. If it is desired to change the beam configuration of another service cell and a specific BWP of the corresponding service cell, this can be achieved by repeatedly performing the entire operation on the corresponding cell. At the same time, in the case where multiple cells have the same beam configuration, if such repeated operation is omitted and the beam configurations in multiple service cells can be updated / activated at the same time, the delay caused by the repeated operation can be reduced, and the signaling overhead can be significantly reduced.

[0344] Figure 2B 1 is a schematic diagram showing the entire process of simultaneously applying activation of a beam group for a downlink signal sent to a PDSCH through multiple service cells and BWPs in an NR system applied to the present disclosure to multiple service cells and BWPs.

[0345] refer to Figure 2B , the NR system is designed to perform data transmission / reception between the UE and the eNB using directional beams. Currently, beam (or TCI state) activation / deactivation is possible only for a specific bandwidth part (BWP) in one serving cell. In the present disclosure, in a CA scenario where multiple serving cells are configured in a UE, an operation of simultaneously updating beam information applied to PDSCH reception configured in multiple BWPs of several serving cells and corresponding cells is proposed, and an operation of reducing the delay time of applying the corresponding configuration and reducing the signaling overhead for this is proposed.

[0346] UE 2b-20 receives the configuration of the beam direction (2b-06 to 2a-08, 2b-11 to 2a-13, 2b-16 to 2a-18), through which the CSI-RS resources and downlink data resources are sent to the configured eNB (service cell) and multiple TRPs 2b-05, 2b-10 and 2b-15. The above beam configuration is configured by RRC for each BWP and each service cell, and for the method of applying the beam activation of PDSCH to multiple cells at the same time as proposed in the present disclosure, it is necessary to specify the configuration of the service cell and the BWP to which the corresponding operation is applied. When the service cell and the specific BWP supporting the corresponding operation are indicated by RRC configuration, the activation beam information of all service cells and BWPs configured by one MAC CE is then updated. Finally, the eNB sends DCI in the active BWP of the service cell to indicate the beam actually operated, and the final beam is determined by the beam indicator included in the DCI. In other words, simultaneous beam updating in multiple serving cells and BWP is only an operation to update the beam indicated in the MAC CE phase, and is not an operation in which the UE actually determines the received beam. The following describes the more detailed operation of each operation:

[0347] 1.RRC configuration operation (2b-25, 2b-30, 2b-35): The operation of configuring the TCI state in PDSCH-Config for each BWP of multiple serving cells through RRC configuration (in the above configuration, the TCI state can be provided as a list, up to 128 TCI states can be configured, and the TCI state can be configured to a higher value)

[0348] For example, a TCI state such as 2b-25 is configured for each BWP configuration included in serving cell 1, and the configuration is present in PDSCH-Config. Similarly, for serving cell 2 and serving cell 3, TCI states such as 2b-30 and 2b-35 may be configured for each BWP configuration, respectively. In addition, for serving cells and BWPs to which the same beam configuration is applied, information indicating this may be added.

[0349] Alternatively, the common configuration application indication information configured through RRC may be omitted, and this may be indicated by a later MAC CE.

[0350] 2. Operation of updating activation / deactivation of candidate TCI states through MAC CE (2b-40): For the TCI state (or tci-state-MultipleTRP, tci-state-group) as the beam transmitting PDSCH, the eNB indicates to the MAC CE the beam candidate group to be activated to the UE. The purpose of MAC CE can be understood as the process of selecting a candidate beam group that can be dynamically indicated by DCI during the beam configuration of the TCI state configured by RRC, and reducing the TCI states that the UE must manage, as well as reducing the number of bits indicated by the DCI.

[0351] The TCI state update operation for several serving cells and BWPs among multiple serving cells and BWPs configured by the RRC message can be performed by one MAC CE. To this end, there is a rule that the TCI state change indicated by the corresponding MAC CE is applied to all configured cells and BWPs, or there is a method of explicitly indicating the corresponding serving cell and BWP in the MAC CE.

[0352] 3. Operation of indicating the beam actually used in the serving cell and BWP through DCI (2b-45): The eNB indicates a specific beam among the candidate beams indicated by the MAC CE through an indicator of DCI (in Rel-15, it consists of 3 bits, and in the present disclosure, it can consist of 3 bits or 4 bits, etc. This is determined according to the number of beams indicated by the MAC CE.). DCI is sent for each active BWP operating in the serving cell and indicates the activated beam.

[0353] Figure 2C 2 is a schematic diagram showing an overall operation of applying activation and deactivation of a beam of a PDSCH to multiple serving cells and BWPs simultaneously as operations of all UEs and eNBs according to an embodiment of the present disclosure.

[0354] refer to Figure 2C , in operation 2c-05, UE2c-01 in idle mode (RRC_IDLE) camps on eNB 2c-02 while searching for a suitable cell, and then in operation 2c-10, access to PCell 2c-02 of eNB is performed for reasons such as the presence of data to be transmitted. In idle mode, because the UE is not connected to the network to save power, data cannot be transmitted, and for data transmission, it is necessary to switch to connected mode RRC_CONNECTED. In addition, camping means that the UE stays in the corresponding cell and receives a paging message to determine whether data is arriving via the downlink. In operation 2c-15, when the UE succeeds in the access process to eNB 2c-02, the UE is changed to connected mode RRC_CONNECTED, and the UE in connected mode can send and receive data to and from the eNB.

[0355] In the RRC connected state, in operation 2c-20, the eNB delivers configuration information (ServingCellConfig) for configuring multiple serving cells and BWP to the UE through an RRC message. The RRC message includes configuration information (PDCCH-Config, PDSCH-Config) for reception through PDCCH and PDSCH, and in particular, may include BWP configuration (BWP-Uplink, BWP-Downlink), CORESET configuration, scrambling configuration, TCI state (TCI state in PDSCH-Config) configuration. TCI state-related configuration may be performed for each downlink BWP and each serving cell, and may be included in PDCCH-Config and PDSCH-Config, respectively, and the beam configuration for PUCCH resource transmission is also included in PUCCH-Config. For reference, in Rel-15, the eNB configures up to 64 downlink beams for transmission to the UE through PDCCH as an RRC message, and one beam actually used is indicated by a MAC CE. In addition, the eNB also includes operations for configuring and indicating downlink beams for transmission through PDSCH. Under certain conditions, a downlink beam for transmission through PDCCH may be used instead of a downlink beam for transmission through PDSCH. Under the above conditions, a case is given where the processing time for switching from a downlink beam for PDCCH to a downlink beam for PDSCH is shorter than the required processing time.

[0356] In operation 2c-25, the eNB may indicate activation of a function requiring activation of TRP operation through L1 / L2 signaling relative to the configuration of the TRP configured as RRC configuration information. The L1 signaling indicates DCI, and the L2 signaling indicates MAC CE. For example, a corresponding MAC CE may be sent to activate the PDCCH TCI state of PCell and SCell 1 (2c-03) and SCell 2 (2c-04). In operation 2c-25, in order to activate the PDSCH TCI state, a corresponding cell and MAC CE of a specific BWP may be sent. In operation 2c-30, the DCI for activating one final beam may be delivered sequentially (see Figure 2A ).

[0357] The present disclosure proposes a method for implementing simultaneous beam updates of multiple carriers and BWPs in operations 2c-20 and 2c-25, which will be described in detail below. In operation 2c-35, data transmission / reception to which corresponding transmission / reception resources are applied is performed by indicating the activated downlink beam (TCI state) and uplink beam (PUCCH resource transmission beam) in operations 2c-25 and 2c-30. For example, the UE performs uplink and downlink data reception through the beam configured for communication with the eNB. In operation 2c-40, for the purpose of updating the previously sent MAC CE, the eNB may re-deliver the MAC CE, and may update or deactivate the activated and deactivated beams. In the present disclosure, operation 2c-40 is intended to update only the beams of a single carrier or BWP, rather than being applied to multiple carriers and BWPs at the same time. For example, it is proposed to activate all beam configurations of multiple carriers / BWPs in operation 2c-25, and to perform an update operation on a single beam in operation 2c-40.

[0358] In addition, during or after the corresponding operation, the beam can be changed through DCI, and in operation 2c-40, the UE can change and apply the active beam information in each TRP according to the L1 / L2 signaling received from the eNB.

[0359] In the following embodiments, a specific method for implementing simultaneous beam updating of multiple carriers and BWP is proposed as a method for indicating the above-mentioned TCI state (i.e., beam configuration and activation) for PDSCH reception. In particular, Embodiment 2-1 and Embodiment 2-2 consider scenarios applied to intra-band CA situations, and Embodiment 2-3 and Embodiment 2-4 consider scenarios that can be applied even in inter-band CA situations. In addition, by supporting not only simultaneous beam updating of multiple carriers and BWPs, but also supporting beam updating of existing single serving cells and BWPs, efficient beam updating operations can be supported, with the advantages of reducing signaling overhead and delay time. The overall operation follows Figure 2C The specific operation will be described in the following embodiments.

[0360] Figure 2D This is Example 2-1 of the embodiment according to the present disclosure. Figure 2D It is a schematic diagram showing method 2-1 for simultaneously updating the TCI states in all configured carriers and BWPs by activating / deactivating MACCE for one TCI state relative to multiple carriers and BWPs when intra-band CA is applied according to embodiment 2-1 disclosed in the present disclosure (mapping the corresponding carrier / BWP information to the RRC configuration).

[0361] refer to Figure 2DIn operation 2d-05, the UE in the RRC connected state may generate and receive UE capability information in response to the UE capability request message of the eNB, and send the obtained information to the eNB. For example, in operation 2d-05, UE capability information including whether to support simultaneous beam update of multiple carriers and BWP may be included. The following two methods may be used as indication methods for this situation:

[0362] 1. The first method of transmitting UE capabilities: a 1-bit indicator is introduced to indicate whether the UE supports simultaneous beam updates of multiple carriers and BWP. If the UE is indicated to support the corresponding capability, it is necessary to add a description that the corresponding capability is applied to all intra-band band combinations or intra-band continuous band combinations included in the UE capability information (in the case where the intra-band non-contiguous band combination is not supported).

[0363] (1-bit indicator per UE, for all supported BCs (in-band BCs only) reported by the UE to the eNB, that the UE supports this feature)

[0364] 2. The second method of transmitting UE capabilities: an indicator indicating whether each band combination supported by the UE supports simultaneous beam updates of multiple carriers and BWP is included and indicated. In Embodiment 2-1, since it is assumed that the UE capability is supported for intra-band BC, it is necessary to insert a phrase stating that only indicators belonging to intra-band BC can configure the corresponding bit as an option. Alternatively, it is necessary to add a description that the corresponding capability applies to an intra-band continuous band combination (when the intra-band non-contiguous band combination is not supported).

[0365] (1 bit indicator per BC, i.e. this feature can be supported among CCs in supported BCs, but is only configured in case of in-band BC)

[0366] When the corresponding indicator is indicated as TRUE for the above UE capability transmission method, the UE may similarly apply the corresponding capability to all BWPs of component carriers belonging to the UE or BC for which the corresponding function is configured. Alternatively, a UE capability indicating that each BWP supports the corresponding capability may be added.

[0367] In operation 2d-10, the eNB delivers configuration information (ServingCellConfig) for configuring multiple serving cells and BWP to the UE through an RRC message. The RRC message includes configuration information (PDCCH-Config, PDSCH-Config) for reception through PDCCH and PDSCH, and in detail, may include BWP configuration (BWP-Uplink, BWP-Downlink), CORESET configuration, scrambling configuration, TCI state (TCI state in PDSCH-Config) configuration. In particular, TCI state-related configuration may be provided for each downlink BWP of each serving cell. For example, TCI state-related configurations are included in PDCCH-Config and PDSCH-Config, respectively, and beam configurations for PUCCH resource transmission may also be included in PUCCH-Config. As a feature of embodiment 2-1, in operation 2d-10, a cell list and a BWP list for simultaneous beam updates applying multiple carriers and BWPs are provided as RRC messages. For example, a serving cell list (e.g., SCell ID list) and a BWP list (e.g., BWP ID list) information to which the same configuration as the TCI state applied to the serving cell and BWP is applied may be added to the PDSCH-Config configured with the TCI state. A cell list (e.g., SCell ID list) and a BWP list (e.g., BWP ID list) information to which the corresponding function is applied at the CellGroupConfig or ServingCellConfig level may be provided. In this case, the TCI state configuration for each cell group or serving cell should be applied identically, and the corresponding configuration may be applied to all serving cells and BWPs in the indicated list.

[0368] In operation 2d-15, the UE may receive a MAC CE indicating activation / deactivation of the TCI state for PDSCH reception from the eNB. Figure 2A and Figure 2B As described in, MAC CE is not actually used for data transmission and reception by activating multiple actually indicated beams, but can play the role of scaling down (or down selection) the beam configured by RRC to the beam that can be indicated by DCI. In this operation, the UE can receive a MAC CE indicating the beam activation of an existing single serving cell and BWP, or a MAC CE indicating the simultaneous beam update of multiple newly defined carriers and BWPs. The specific MAC CE structure will be described later.

[0369] In operation 2d-20, the UE analyzes the MAC CE received in operation 2d-15 to determine whether the MAC CE indicates an operation, and then performs the relevant operation. If the received MAC CE indicates simultaneous beam update of multiple carriers and BWPs by allocating a new LCID or including indication information indicating a new LCID in an existing MAC CE field (e.g., a 1-bit indicator and an applied SCell / BWP ID), then in operation 2d-25, the UE can update all corresponding TCI states by applying the TCI state indicated by the received MAC CE to the carrier and BWP list configured in operation 2d-10. The service cell ID and BWP ID indicated to the MAC CE in operation 2d-25 can be one of the service cells and BWPs configured in the carrier and BWP list configured in operation 2d-10, and can be, for example, a PCell ID and a downlink active BWP ID. Since the corresponding service cell and BWP configurations have been configured to be applied simultaneously, the update of the TCI state can be applied to all configured service cell IDs and BWP IDs, even if any associated SCell ID / BWP ID is indicated. In operation 2d-30, the UE can determine the beam actually used for PDSCH reception by receiving DCI from the activated BWP from each serving cell. Unlike the MAC CE operation in operation 2d-25, the corresponding operation can be indicated separately for each serving cell / BWP through DCI. In operation 2d-35, the UE can perform data transmission / reception through the configured beam. In the case where the TCI state activation / deactivation MAC CE is received again, operation 2d-20 is repeated.

[0370] When the MAC CE received by the UE in operation 2d-20 indicates beam activation of a single service cell and BWP (i.e., in the case of an existing MAC CE: a case where an existing LCID is allocated or a case where indication information indicating beam update of multiple service cells and BWP is not included in the existing MAC CE field), the UE may update the TCI state of the service cell and BWP by applying the TCI state indicated by the MAC CE received in operation 2d-40. In operation 2d-45, DCI is received from the BWP activated for each service cell, the beam actually used for PDSCH reception is determined, and data is sent / received through the corresponding beam in operation 2d-50. Next, when a TCI state activation / deactivation MAC CE is received again, operation 2d-20 may be repeated.

[0371] In particular, Figure 2EIt is a schematic diagram showing method 2-2 according to an embodiment of the present disclosure. In the case of applying in-band CA, method 2-2 simultaneously updates the TCI status in all configured carriers and BWPs by activating / deactivating MAC CE with respect to one TCI status of multiple carriers and BWPs (the corresponding carrier / BWP information is specified in MAC CE).

[0372] refer to Figure 2E In operation 2e-05, the UE in the RRC connected state may generate and receive UE capability information in response to the UE capability request message of the eNB, and send the obtained information to the eNB. For example, in operation 2e-05, UE capability information including whether to support simultaneous beam update of multiple carriers and BWP may be included. The following two methods may be used as indication methods for this situation.

[0373] 1. The first method of transmitting UE capabilities: a 1-bit indicator is introduced to indicate whether the UE supports simultaneous beam updates of multiple carriers and BWP. If the UE is indicated to support the corresponding capability, it is necessary to add a description that the corresponding capability is applied to all intra-band band combinations or intra-band continuous band combinations included in the UE capability information (in the case where the intra-band non-contiguous band combination is not supported).

[0374] (1-bit indicator per UE, for all supported BCs (in-band BCs only) reported by the UE to the eNB, that the UE supports this feature)

[0375] 2. The second method of transmitting UE capabilities: an indicator indicating whether each band combination supported by the UE supports simultaneous beam updates of multiple carriers and BWP is included and indicated. In Embodiment 2-2, since it is assumed that the UE capability is supported for intra-band BC, it is necessary to insert a phrase stating that only indicators belonging to intra-band BC can configure the corresponding bits as options. Alternatively, it is necessary to add a description that the corresponding capability applies to intra-band continuous band combinations (when intra-band non-contiguous band combinations are not supported).

[0376] (1 bit indicator per BC, i.e. this feature can be supported among CCs in supported BCs, but is only configured in case of in-band BC)

[0377] When the corresponding indicator is indicated as true for the above UE capability transmission method, the UE can equally apply the corresponding capability to all BWPs of component carriers belonging to the UE or BC for which the corresponding function is configured. Alternatively, a UE capability indicating that each BWP supports the corresponding capability can be added.

[0378] In operation 2e-10, the eNB delivers configuration information (ServingCellConfig) for configuring multiple serving cells and BWP to the UE through an RRC message. The RRC message includes configuration information (PDCCH-Config, PDSCH-Config) for receiving through PDCCH and PDSCH, and in detail, may include BWP configuration (BWP-Uplink, BWP-Downlink), CORESET configuration, scrambling configuration, TCI state (TCI state in PDSCH-Config) configuration. In particular, TCI state-related configuration can be provided for each downlink BWP of each serving cell. TCI state-related configurations are included in PDCCH-Config and PDSCH-Config, respectively, and beam configurations for PUCCH resource transmission may also be included in the PUCCH configuration. In addition, whether multiple carriers and BWPs are configured can be indicated in the corresponding RRC configuration. This can be seen by configuring a 1-bit indicator.

[0379] In operation 2e-15, the UE may receive a MAC CE indicating activation / deactivation of a TCI state for PDSCH reception from the eNB. Figure 2A and 2B As described in, the MAC CE is not actually used for data transmission and reception by activating multiple actually indicated beams, but can play a role in narrowing (or down-selecting) the beams configured by RRC to the beams that can be indicated by DCI. In embodiment 2, a method is proposed in which, in the RRC configuration information of operation 2e-10, there is no additional configuration, and the existing Rel-15 configuration is used as it is, and a new MAC CE is introduced in the corresponding operation, and the beam activation of multiple service cells and BWPs is indicated by receiving the new MAC CE. In other words, this is a method in which all service cells and BWP identifiers to which beam updates are applied in a new MAC CE are specified. In this operation, the UE can receive a MAC CE indicating the beam activation of an existing single service cell and BWP, or can receive a MAC CE indicating simultaneous beam updates of multiple newly defined carriers and BWPs. The specific MAC CE structure will be described later.

[0380] In operation 2e-20, the UE analyzes the MAC CE received in operation 2e-15 to determine whether the MAC CE indicates an operation, and then performs relevant operations. If the received MAC CE indicates simultaneous beam updates of multiple carriers and BWPs (by allocating a new LCID or including indication information indicating the new LCID in an existing MAC CE field (e.g., a 1-bit indicator and an applied SCell / BWP ID)), then in operation 2e-25, the UE can update all corresponding TCI states by applying the TCI state indicated by the received MAC CE to the entire indicated carrier and BWP list. In operation 2e-25, the serving cell and BWP to which the MAC CE is sent can be an activated serving cell and BWP, and can be, for example, a downlink active BWPID of a PCell. In operation 2e-30, the beam actually used to receive the PDSCH can be determined by receiving a DCI from an activated BWP from each serving cell. Unlike the MAC CE operation in 2e-25, the corresponding operation can be indicated separately for each serving cell / BWP by DCI. In operation 2e-35, the UE may perform data transmission / reception through the configured beam. In addition, when the TCI state activation / deactivation MAC CE is received again, operation 2e-20 may be repeated.

[0381] In operation 2e-20, when the MAC CE received by the UE indicates beam activation of a single serving cell and BWP (in the case of an existing MAC CE: an existing LCID is allocated, or in the case where the existing MAC CE field does not include indication information indicating beam update of multiple serving cells and BWPs), the UE can update the TCI state of the serving cell and BWP by applying the TCI state indicated by the MAC CE received in operation 2e-40. In operation 2e-45, DCI is received from the BWP activated by each serving cell, the beam actually used for PDSCH reception is determined, and data is sent / received through the corresponding beam in operation 2e-50. When the TCI state activation / deactivation MAC CE is received again, operation 2e-20 can be repeated.

[0382] In particular, Figure 2F It is a schematic diagram showing method 2-3 according to an embodiment of the present disclosure. When inter-band CA is applied according to embodiment 2-3 of the present disclosure, method 2-3 activates / deactivates MAC CE by one TCI state relative to multiple carriers and BWPs, and simultaneously updates the TCI states in all configured carriers and BWPs (mapping the corresponding carrier / BWP information to the RRC configuration).

[0383] refer to Figure 2FIn operation 2f-05, the UE in the RRC connected state may generate and receive UE capability information in response to the UE capability request message of the eNB, and send the obtained information to the eNB. For example, in the corresponding operation, UE capability information including whether to support simultaneous beam update of multiple carriers and BWP may be included. The following two methods may be used as indication methods for this situation.

[0384] 1. The first method of transmitting UE capabilities: a 1-bit indicator is introduced to indicate whether the UE supports simultaneous beam updates of multiple carriers and BWP. If the UE is indicated to support the corresponding capability, it is necessary to add a description that the corresponding capability is applied to all frequency band combinations (including both intra-band BC and inter-band BC) included in the UE capability information.

[0385] (1 bit indicator per UE, for all supported BCs reported by the UE to the eNB, the UE supports this feature)

[0386] 2. The second method of transmitting UE capabilities: an indicator indicating whether each band combination supported by the UE supports multiple carriers and simultaneous beam updating of BWP is included and indicated. In Embodiment 2-3, the indication information may be included in the BC not only for intra-band BC but also for inter-band BC.

[0387] (1 bit indicator per BC, i.e. this feature may be supported in CCs in supported BCs (including intra-band and inter-band BCs))

[0388] When the corresponding indicator is indicated as TRUE for the above UE capability transmission method, the UE can similarly apply the corresponding capability to all BWPs of the component carriers belonging to the UE or the BC for which the corresponding function is configured. Alternatively, a UE capability indicating that each BWP supports the corresponding capability can be added. In the case of indicating whether inter-band BC is supported, the eNB should consider the MIMO capability (particularly, tci-state PDSCH capability) indicated for each frequency band as shown in Table 4 below to set the actual configuration information.

[0389] [Table 4]

[0390]

[0391] In operation 2f-10, the eNB may deliver configuration information (ServingCellConfig) for configuring multiple serving cells and TRP to the UE via an RRC message. The RRC message may include configuration information (PDCCH-Config, PDSCH-Config) for reception via PDCCH and PDSCH. In addition, BWP configuration (BWP-Uplink, BWP-Downlink), CORESET configuration, scrambling configuration, TCI state (TCI state in PDSCH-Config) configuration may be included. In particular, TCI state-related configurations are provided for each downlink BWP and each serving cell, and are included in PDCCH-Config and PDSCH-Config, respectively, and beam configurations for PUCCH resource transmission may also be included in PUCCH-Config. In embodiment 2-3, in operation 2f-10, a cell list and a BWP list for simultaneous beam updates applying multiple carriers and BWPs are provided as RRC messages. In particular, a serving cell list (e.g., SCell ID list) and a BWP list (e.g., BWP ID list) information configured with the same configuration as the TCI state applied to the corresponding serving cell and BWP may be added to the PDSCH-Config in which the TCI state is applied. A cell list (e.g., SCell ID list) and a BWP list (e.g., BWP ID list) information for applying the corresponding function at the CellGroupConfig (cell group configuration) or ServingCellConfig (serving cell configuration) level may be provided. In this case, the TCI state configuration for each cell group or serving cell should be applied identically, and the configuration may be applied to all serving cells and BWPs in the indicated list.

[0392] In operation 2f-15, the UE may receive a MAC CE indicating activation / deactivation of the TCI state for PDSCH reception from the eNB. Figure 2A and 2B As described in, MAC CE is not actually used for data transmission and reception by activating multiple actually indicated beams, but can play the role of narrowing (or down-selecting) the beam configured by RRC to the beam that can be indicated by DCI. In this operation, the UE can receive a MAC CE indicating the beam activation of an existing single serving cell and BWP. Alternatively, the MAC CE indicates the simultaneous beam update of multiple newly defined carriers and BWPs. The specific MAC CE structure will be described later.

[0393] In operation 2f-20, the UE analyzes the MAC CE received in operation 2f-15 to determine whether the MAC CE indicates an operation, and then performs the relevant operation. If the received MAC CE indicates a simultaneous beam update of multiple carriers and BWPs (by allocating a new LCID or including indication information indicating the new LCID in an existing MAC CE field (e.g., a 1-bit indicator and an applied SCell / BWP ID)), then in operation 2f-25, the UE may update all corresponding TCI states by applying the TCI state indicated by the received MAC CE to the carrier and BWP list configured in operation 2f-10. The service cell ID and BWP ID indicated to the MAC CE in operation 2f-25 may be one of the service cells and BWPs configured in the carrier and BWP list configured in operation 2f-10, and may be, for example, a PCell ID and a downlink active BWP ID. Since the corresponding service cell and BWP configurations have been configured to be applied simultaneously, the update of the TCI state may be applied to all configured service cell IDs and BWP IDs, even if any associated SCell ID / BWP ID is indicated. In operation 2f-30, the UE can determine the beam actually used for PDSCH reception by receiving DCI from the activated BWP from each serving cell. Unlike the MAC CE operation in operation 2f-25, the corresponding operation can be indicated separately for each serving cell / BWP through DCI. In operation 2f-35, the UE can perform data transmission / reception through the configured beam. In the case where the TCI state activation / deactivation MAC CE is received again, operation 2f-20 is repeated.

[0394] When the MAC CE received by the UE in operation 2f-20 indicates beam activation of a single serving cell and BWP (i.e., in the case of an existing MAC CE: a case where an existing LCID is allocated or a case where indication information indicating beam update of multiple serving cells and BWP is not included in the existing MAC CE field), the UE may update the TCI state of the serving cell and BWP by applying the TCI state indicated by the MAC CE received in operation 2f-40. In operation 2f-45, DCI is received from the BWP activated for each serving cell, the beam actually used for PDSCH reception is determined, and data is sent / received through the corresponding beam in operation 2f-50. When a TCI state activation / deactivation MAC CE is received again, operation 2f-20 may be repeated.

[0395] Figure 2GIt is a schematic diagram showing method 2-4 according to an embodiment of the present disclosure. In method 2-4, when inter-band CA is applied according to the embodiment, the TCI status in all configured carriers and BWPs is simultaneously updated by activating / deactivating MAC CE with respect to one TCI status of multiple carriers and BWPs (the corresponding carrier / BWP information is specified in MAC CE).

[0396] refer to Figure 2G In operation 2g-05, the UE in the RRC connected state may generate and receive UE capability information in response to the UE capability request message of the eNB, and send the obtained information to the eNB. For example, in operation 2g-05, UE capability information including whether to support simultaneous beam update of multiple carriers and BWP may be included. The following two methods may be used as indication methods for this situation.

[0397] 1. The first method of transmitting UE capabilities: a 1-bit indicator is introduced to indicate whether the UE supports simultaneous beam updates of multiple carriers and BWP. If the UE is indicated to support the corresponding capability, it is necessary to add a description that the corresponding capability is applied to all frequency band combinations (including both intra-band BC and inter-band BC) included in the UE capability information.

[0398] (1 bit indicator per UE, for all supported BCs reported by the UE to the eNB, the UE supports this feature)

[0399] 2. The second method of transmitting UE capabilities: an indicator indicating whether each band combination supported by the UE supports multiple carriers and simultaneous beam updating of BWP is included and indicated. In embodiment 4, the indication information may be included in the BC not only for intra-band BC but also for inter-band BC.

[0400] (1 bit indicator per BC, i.e. this feature may be supported in CCs in supported BCs (including intra-band and inter-band BCs))

[0401] When the corresponding indicator is indicated as TRUE for the above UE capability transmission method, the UE can similarly apply the corresponding capability to all BWPs of the component carriers belonging to the UE or the BC for which the corresponding function is configured. Alternatively, a UE capability indicating that each BWP supports the corresponding capability can be added. In the case of indicating whether inter-band BC is supported, the eNB should consider the MIMO capability (particularly, tci-statePDSCH capability) indicated for each frequency band as shown in Table 5 below to set the actual configuration information.

[0402] [Table 5]

[0403]

[0404] In operation 2g-10, the eNB may deliver configuration information (ServingCellConfig) for configuring multiple serving cells and TRPs to the UE via an RRC message. The RRC message may include configuration information (PDCCH-Config, PDSCH-Config) for reception via PDCCH and PDSCH. In addition, BWP configuration (BWP-Uplink, BWP-Downlink), CORESET configuration, scrambling configuration, TCI state (TCI state in PDSCH-Config) configuration may be included. For example, TCI state-related configuration is provided for each downlink BWP and each serving cell, and is included in PDCCH-Config and PDSCH-Config, respectively, and the beam configuration for PUCCH resource transmission may also be included in PUCCH-Config. Whether multiple carriers and BWPs are configured may be indicated in the corresponding RRC configuration. This can be seen by configuring a 1-bit indicator.

[0405] In operation 2g-15, the UE may receive a MAC CE indicating activation / deactivation of a TCI state for PDSCH reception from the eNB. Figure 2A and Figure 2B As described in, the MAC CE is not actually used for data transmission and reception by activating multiple actually indicated beams, but can play the role of narrowing (or down-selecting) the beam configured by RRC to the beam that can be indicated by DCI. In embodiment 4, a method is proposed in which the configuration of the existing Rel-15 is used as is in the RRC configuration information of operation 2e-10 without additional configuration, and a new MAC CE is introduced, and a new MAC CE is received in the corresponding operation to indicate the beam activation of multiple service cells and BWPs. Specifically, this is a method in which all service cells and BWP identifiers to which beam updates are applied in a new MAC CE are specified. In this operation, the UE can receive a MAC CE indicating the beam activation of an existing single service cell and BWP. Alternatively, a MAC CE indicating simultaneous beam updates of multiple newly defined carriers and BWPs can be received. The specific MAC CE structure will be described later.

[0406] In operation 2g-20, the UE analyzes the MAC CE received in operation 2g-15 to determine whether the MAC CE indicates an operation, and then performs the relevant operation. If the received MAC CE indicates a simultaneous beam update of multiple carriers and BWPs (by allocating a new LCID or including indication information indicating the new LCID in an existing MAC CE field (e.g., a 1-bit indicator and an applied SCell / BWP ID)), then in operation 2g-25, the UE can update all corresponding TCI states by applying the TCI state indicated by the received MAC CE to all indicated carriers and BWP lists. The serving cell and BWP to which the MAC CE is sent in operation 2g-25 can be a configured serving cell and BWP, and can be, for example, a downlink active BWP ID of a PCell. In operation 2g-30, by receiving DCI from an activated BWP from each serving cell, the beam actually used for PDSCH reception can be determined. Unlike the MAC CE operation in 2g-25, the corresponding operation can be indicated separately for each serving cell / BWP through DCI. In operation 2g-35, the UE performs data transmission / reception through the configured beam, and if the UE receives the TCI state activation / deactivation MAC CE again, operation 2g-20 may be repeated.

[0407] When the MAC CE received by the UE in operation 2g-20 indicates beam activation of a single serving cell and BWP (i.e., in the case of an existing MAC CE: when an existing LCID is assigned or when the existing MAC CE field does not include indication information indicating beam update of multiple serving cells and BWPs), the UE may update the TCI state of the serving cell and BWP by applying the TCI state indicated by the MAC CE received in operation 2g-40. In operation 2g-45, DCI is received from the BWP activated for each serving cell, the beam actually used for PDSCH reception is determined, and data is sent / received through the corresponding beam in operation 2d-50. When a TCI state activation / deactivation MAC CE is received again, operation 2g-20 may be repeated.

[0408] Figure 2HA , Figure 2HB , Figure 2HC , Figure 2HD and Figure 2HE is a schematic diagram illustrating an operation of simultaneously updating TCI states of multiple carriers and BWP according to various embodiments of the present disclosure.

[0409] refer to Figure 2HA – Figure 2HE, based on the "TCI state activation / deactivation for UE-specific PDSCH MAC CE" currently defined in Rel-15, it is possible to change to a new MAC CE or add a new field. Figure 2HA As shown, the existing MAC CE structure consists of the reserved bit 2h-05, the serving cell ID 2h-10 and the BWP ID 2h-15, and consists of the TCI state bitmap "T" field 2h-20 indicating activation. Through the existing MAC CE, the downlink activation candidate beam of a serving cell can be indicated.

[0410] In the present disclosure, a first method (mapping the corresponding carrier / BWP information to the RRC configuration) and a second method (specifying the corresponding carrier / BWP information to the MAC CE) of simultaneously updating the TCI status in all configured carriers and BWPs through one TCI status activation / deactivation MAC CE are proposed. For these two methods, the MAC CE structures used are basically different from each other.

[0411] First, the MAC CE structure applied to the first method will be described, which provides a cell / BWP list for simultaneous beam update of multiple carriers and BWPs through RRC configuration, and updates the beams of the corresponding cells / BWPs to the MACCE structure (Examples 2-1 and 2-3).

[0412] -Option 1: Use the existing MAC CE structure as is and introduce a new LCID to use it as a new MAC CE. Figure 2HB As shown, the MAC CE structure consists of reserved bits 2h-25, serving cell ID 2h-30 and BWP ID 2h-35, and a TCI status bitmap "T" field indicating activation, and consists of a TCI status bitmap "T" field 2h-40 indicating activation. First, the UE can know that the corresponding MAC CE is a MAC CE for simultaneous beam update of multiple carriers and BWPs through LCID. Through the MAC CE, one serving cell and BWP among the serving cell / BWP mapping provided by the previous RRC configuration can be specified, and when the corresponding information is received, the UE can perform simultaneous beam update with respect to all serving cells and BWPs configured as RRC.

[0413] - Option 2: The existing MAC CE can be extended to a MAC CE for simultaneous beam updates of multiple carriers and BWPs. Figure 2HCAs shown, the existing LCID is used as is, and the MAC CE consists of a simultaneous beam update indication (D) of 2h-45, a serving cell ID 2h-50, and a BWP ID 2h-55, and consists of a TCI state bitmap "T" field 2h-60 indicating activation. The UE can know whether the corresponding MAC CE is a MAC CE for simultaneous beam update of multiple carriers and BWP, or a MAC CE for an existing single carrier and BWP through the simultaneous beam update branch (D) of 2h-45.

[0414] In the above-mentioned Option 1 and Option 2, information (list) about carriers and BWPs to which simultaneous beam updating is applied is not provided, and the corresponding information may be received in advance through RRC configuration.

[0415] Hereinafter, a MAC CE structure applied to the second method will be described, which second method only provides and updates the cell / BWP list for simultaneous beam update of multiple carriers and BWPs through the MAC CE structure, without receiving information (list) of carriers and BWPs to which simultaneous beam update is applied in the RRC configuration (Example 2-2 and Example 2-4).

[0416] -Option 3: Introduce a new LCID and use it as a new MAC CE. Figure 2HD As shown, in the MAC CE structure, a reserved bit of 2h-65 and an indicator 2h-70 indicating the number of service cells and BWPs to which the corresponding MAC CE is applied are introduced, and then the service cell and BWP ID information is continuously included as many as the number indicated in 2h-70. Specifically, the MAC CE structure consists of reserved bits 2h-75, 2h-90 and 2h-105, service cell IDs 2h-80, 2h-95 and 2h-110, BWP IDs 2h-85, 2h-100 and 2h-115, and may consist of a TCI state bitmap "T" field 2h-120 indicating activation. First, the UE may know that the corresponding MAC CE is a MAC CE for simultaneous beam updates of multiple carriers and BWPs via LCID. Referring to the information transmitted via the MAC CE, the UE may perform simultaneous beam updates of all indicated service cells and BWPs.

[0417] - Option 4: The existing MAC CE can be extended with MAC CE for simultaneous beam updates of multiple carriers and BWP. Figure 2HEAs shown, the existing LCID is used as is, and the MAC CE consists of a simultaneous beam update indication (D) of 2h-125, a serving cell ID 2h-130, and a BWP ID 2h-135, and consists of a TCI state bitmap "T" field 2h-140 indicating activation. Information of the serving cell and the subsequently added BWP ID may be included consecutively. The MAC CE may consist of reserved bits 2h-145 and 2h-160, serving cell IDs 2h-150 and 2h-165, and BWP IDs 2h-155 and 2h-170. The UE may know through the simultaneous beam update branch (D) of 2h-125 whether the corresponding MAC CE is a MAC CE for simultaneous beam update of multiple carriers and BWP or a MAC CE for an existing single carrier and BWP.

[0418] Fig.2I is a schematic diagram illustrating the overall operation of an eNB according to an embodiment of the present disclosure.

[0419] refer to Fig.2I In operation 2i-05, the eNB may establish an RRC connection state with the UE. In operation 2i-10, the UE capability may be requested from the UE, and corresponding UE capability information may be received. The eNB may analyze the UE capability received in the above operation and determine whether the UE has the capability to perform simultaneous beam update operations on multiple carriers and BWPs. In addition, it may be confirmed whether the eNB is configured with the corresponding function (it may be confirmed whether the corresponding function is applicable to intra-band BC or inter-band BC).

[0420] After completing the above confirmation, in operation 2i-15, the eNB may provide the UE with configuration information related to the simultaneous beam update operation of multiple carriers and BWP according to the UE capability through an RRC message. This corresponds to embodiments 2-1 and 2-3 of the present disclosure, and in embodiments 2-2 and 2-4, no additional information is provided in the above operations. If the UE does not have the corresponding capability or the eNB determines that the configuration is not necessary, the configuration information required for the simultaneous beam update operation of multiple carriers and BWP may not be provided, but configuration information for a basic TRP operation may be provided.

[0421] In operation 2i-20, based on the PDSCH beam configuration information configured by RRC (including information about simultaneous beam update operation of multiple carriers and BWP), the eNB can indicate beam update by delivering a MAC CE for beam update of a specific carrier and BWP. In this operation, the existing TCI state activation MAC CE can be used. In operation 2i-25, the eNB can indicate beam information for data communication by indicating that the DCI is a BWP activation beam for a specific serving cell, and the indicated beam information can be used.

[0422] Figure 2J is a block diagram showing an internal structure of a UE according to an embodiment of the present disclosure.

[0423] refer to Figure 2J , the UE includes a radio frequency (RF) processor 2j-10, a baseband processor 2j-20, a storage unit 2j-30 and a controller 2j-40.

[0424] The RF processor 2j-10 sends and receives signals through a wireless channel, such as frequency conversion and amplification of signals. The RF processor 2j-10 up-converts the baseband signal provided by the baseband processor 2j-20 into an RF band signal, transmits the obtained signal through an antenna, and down-converts the RF band received by the antenna into a baseband signal. For example, the RF processor 2j-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), etc. In the accompanying drawings, only one antenna is shown, but the UE may include multiple antennas. In addition, the RF processor 2j-10 may include multiple RF chains. In addition, the RF processor 2j-10 may perform beamforming. For beamforming, the RF processor 2j-10 may adjust the phase and amplitude of each of the signals sent / received through multiple antennas or antenna elements. In addition, the RF processor may perform MIMO, and may receive multiple layers when performing MIMO operations.

[0425] The baseband processor 2j-20 converts between baseband signals and bit streams according to the physical layer standard of the system. For example, when sending data, the baseband processor 2j-20 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when receiving data, the baseband processor 2j-20 recovers the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 2j-10. For example, in the case of an orthogonal frequency division multiplexing (OFDM) scheme, when sending data, the baseband processor 2j-20 generates complex symbols by encoding and modulating the transmitted bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols through an inverse fast Fourier transform (IFFT) operation and a cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processor 2j-20 divides the baseband signal provided from the RF processor 2j-10 in units of OFDM symbols, recovers the signal mapped to the subcarrier through an FFT (FFT) operation, and then recovers the received bit stream through demodulation and decoding.

[0426] The baseband processor 2j-20 and the RF processor 2j-10 send and receive signals as described above. Therefore, the baseband processor 2j-20 and the RF processor 2j-10 can be referred to as a transmitter, a receiver, a transceiver or a communication unit. In addition, at least one of the baseband processor 2j-20 and the RF processor 2j-10 may include multiple communication modules to support a variety of different radio access technologies. In addition, at least one of the baseband processor 2j-20 and the RF processor 2j-10 may include different communication modules to process signals of different frequency bands. For example, different radio access technologies may include wireless LAN (e.g., IEEE802.11), cellular networks (e.g., LTE), etc. In addition, different frequency bands may include ultra-high frequency (SHF) (e.g., 2.NRhz, NRHz) bands and millimeter wave (e.g., 60GHz) bands.

[0427] The storage unit 2j-30 stores data such as basic programs, applications, and configuration information for UE operation. In particular, the storage unit 2j-30 can store information related to a second access node that performs wireless communication using a second radio access technology. In addition, the storage unit 2j-30 provides the stored data according to a request from the controller 2j-40.

[0428] The controller 2j-40 ​​controls the overall operation of the UE. For example, the controller 2j-40 ​​sends and receives signals through the baseband processor 2j-20 and the RF processor 2j-10. In addition, the controller 2j-40 ​​writes and reads data in the storage unit 2j-40. To this end, the controller 2j-40 ​​may include at least one processor. For example, the controller 2j-40 ​​may include a communication processor (CP) that controls communication and an application processor (AP) that controls high layers such as applications. The controller 2j-40 ​​may also include a multi-connection processor 2j-42 for supporting multiple connections.

[0429] Figure 2K is a block diagram showing the configuration of an NR eNB according to an embodiment of the present disclosure.

[0430] refer to Figure 2K , the eNB includes an RF processor 2k-10, a baseband processor 2k-20, a backhaul communication unit 2k-30, a storage unit 2k-40 and a controller 2k-50.

[0431] The RF processor 2k-10 sends and receives signals through a wireless channel, such as frequency conversion and amplification of signals. The RF processor 2k-10 up-converts the baseband signal provided by the baseband processor 2k-20 into an RF band signal, sends the obtained signal through an antenna, and down-converts the RF band signal received by the antenna into a baseband signal. For example, the RF processor 2k-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. In the figure, only one antenna is shown, but the first access node may include multiple antennas. In addition, the RF processor 2k-10 may include multiple RF chains. In addition, the RF processor 2k-10 can perform beamforming. For beamforming, the RF processor 2k-10 can adjust the phase and amplitude of each of the signals sent and received by multiple antennas or antenna elements. The RF processor can perform downlink MIMO operations by sending one or more layers.

[0432] The baseband processor 2k-20 performs the function of converting between the baseband signal and the bit stream according to the physical layer standard of the first radio access technology. For example, when sending data, the baseband processor 2k-20 generates complex symbols by encoding and modulating the transmitted bit stream. In addition, when receiving data, the baseband processor 2k-20 recovers the received bit stream by demodulating and decoding the baseband signal provided from the RF processor 2k-10. For example, in the case of the OFDM scheme, when sending data, the baseband processor 2k-20 generates complex symbols by encoding and modulating the transmitted bit stream, maps the complex symbols to subcarriers, and then configures OFDM symbols through IFFT operations and CP insertion. In addition, when receiving data, the baseband processor 2k-20 divides the baseband signal provided from the RF processor 2k-10 in units of OFDM symbols, recovers the signal mapped to the subcarrier by FFT operations, and then recovers the received bit stream by demodulation and decoding. The baseband processor 2k-20 and the RF processor 2k-10 send and receive signals as described above. Therefore, the baseband processor 2k-20 and the RF processor 2k-10 can be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

[0433] The backhaul communication unit 2k-30 provides an interface for performing communication with other nodes in the network. The backhaul communication unit 2k-30 converts the bit stream sent from the master eNB to other nodes (e.g., auxiliary eNB, core network, etc.) into a physical signal, and converts the physical signal received from other nodes into a bit stream.

[0434] The storage unit 2k-40 stores data such as basic programs, applications, and configuration information for the operation of the master eNB. In particular, the storage unit 2k-40 may store information about the bearers assigned to the connected UEs, measurement results reported from the connected UEs, and the like. In addition, the storage unit 2k-40 may store information as a criterion for determining whether to provide or stop multiple connections to the UE. In addition, the storage unit 2k-40 provides the stored data according to the request of the controller 2k-50.

[0435] The controller 2k-50 controls the overall operation of the master eNB. For example, the controller 2k-50 sends and receives signals through the baseband processor 2k-20 and the RF processor 2k-10 or through the backhaul communication unit 2k-30. The controller 2k-50 writes and reads data in the storage unit 2k-40. To this end, the controller 2k-50 may include at least one processor. For example, the controller 2k-50 may include a communication processor (CP) that controls communication and an application processor (AP) that controls the upper layer such as an application. The controller 2k-50 may also include a multi-connection processor 2k-52 for supporting multiple connections.

[0436] The methods disclosed in the claims and / or the methods according to various embodiments of the present disclosure may be implemented by hardware, software, or a combination of hardware and software.

[0437] When these methods are implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors in an electronic device. At least one program may include instructions for causing an electronic device to perform methods according to various embodiments of the present disclosure as defined by the appended claims and / or disclosed herein.

[0438] The program (software module or software) can be stored in a non-volatile memory (including random access memory and flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disk storage device, CD-ROM (CD-ROM), digital versatile discs (DVD) or other types of optical storage devices or tapes). Alternatively, any combination of some or all of them can form a memory storing the program. In addition, multiple such memories may be included in the electronic device.

[0439] In addition, the program can be stored in an attachable storage device that can access the electronic device through a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (Wide LAN, WLAN) and a storage area network (Storage Area Network, SAN) or a combination thereof. Such a storage device can access the electronic device via an external port. In addition, an independent storage device on a communication network can access a portable electronic device.

[0440] In the above detailed embodiments of the present disclosure, the elements included in the present disclosure are expressed in the singular or plural, depending on the detailed embodiments presented. However, for ease of description, the singular form or plural form is appropriately selected to the presented situation, and the present disclosure is not limited to the elements expressed in the singular or plural form. Therefore, an element expressed in the plural may also include a single element, or an element expressed in the singular may also include multiple elements.

[0441] Furthermore, a particular embodiment may be partially or completely combined with some or all of one or more other embodiments to be implemented as another embodiment.

[0442] While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: receiving, from a base station, configuration information for configuring a cell group including a plurality of serving cells, the configuration information including first information for configuring a plurality of transmission configuration indicators (TCI) states associated with a physical downlink shared channel (PDSCH) of each downlink bandwidth part (BWP) of each serving cell and second information on a list of at least one serving cell for which the TCI state is simultaneously updated by a medium access control (MAC) control element (CE); receiving, from the base station, a MAC CE including information bits corresponding to a plurality of TCI states and information indicating an identity ID of a first serving cell among the plurality of serving cells, wherein one bit of the information bits indicates activation or deactivation of each of the plurality of TCI states, and at least one TCI state among the plurality of TCI states is activated for the first serving cell based on the MAC CE; Based on the second information, identifying whether the first serving cell is included in the at least one serving cell; and In case that the first serving cell is included in the at least one serving cell, the MAC CE is applied to all of the at least one serving cell.

2. The method according to claim 1, wherein: Applying the MAC CE to the at least one serving cell includes: The at least one TCI state is activated for each of the at least one serving cell.

3. The method according to claim 1, further comprising: Receiving, from the base station, first downlink control information DCI for a first PDSCH on an activated BWP scheduling the first serving cell, the first DCI including TCI information indicating a first TCI state of the first PDSCH in the at least one TCI state; and receiving, from the base station, a second DCI for a second PDSCH on the BWP scheduling activation of a second serving cell among the at least one serving cell, the second DCI including TCI information indicating a second TCI state of the second PDSCH among the at least one TCI state, The first PDSCH is received on the first serving cell based on a first TCI state, and the second PDSCH is received on the second serving cell based on a second TCI state.

4. The method according to claim 1, further comprising: Receiving a user equipment UE capability query message from a base station; and Sending a UE capability information message to a base station, the UE capability information message including information indicating that the terminal supports simultaneous TCI status update across multiple carriers, The UE capability information message indicates that a frequency band of the at least one serving cell is supported by the terminal.

5. A method performed by a base station in a wireless communication system, the method comprising: Sending configuration information for configuring a cell group including a plurality of serving cells to a terminal, the configuration information including first information for configuring a plurality of transmission configuration indicators (TCI) states associated with a physical downlink shared channel (PDSCH) of each downlink bandwidth part (BWP) of each serving cell and second information about a list of at least one serving cell for which the TCI state is simultaneously updated by a medium access control (MAC) control element (CE); and sending a MAC CE including information bits corresponding to a plurality of TCI states and information indicating an identity ID of a first serving cell among the plurality of serving cells to the terminal, wherein one bit of the information bits indicates activation or deactivation of each of the plurality of TCI states, and at least one TCI state among the plurality of TCI states is activated for the first serving cell based on the MAC CE, In which, in a case where the first serving cell is included in the at least one serving cell, the MAC CE is applied to all of the at least one serving cell.

6. The method according to claim 5, in, At least one TCI state indicated by the MAC CE is activated for each of the at least one serving cell.

7. The method according to claim 5, further comprising: Sending, to the terminal, first downlink control information DCI of a first PDSCH on an activated BWP that schedules the first serving cell, where the first DCI includes TCI information indicating a first TCI state of the first PDSCH in the at least one TCI state; and Sending to the terminal a second DCI for a second PDSCH on an activated BWP that schedules a second serving cell in the at least one serving cell, wherein the second DCI includes TCI information indicating a second TCI state of the second PDSCH in the at least one TCI state, The first PDSCH is sent on the first serving cell based on a first TCI state, and the second PDSCH is sent on the second serving cell based on a second TCI state.

8. The method according to claim 5, further comprising: Sending a user equipment UE capability query message to the terminal; and receiving, from the terminal, a UE capability information message including information indicating that the terminal supports simultaneous TCI update across multiple carriers, The UE capability information message indicates that a frequency band of the at least one serving cell is supported by the terminal.

9. A terminal in a wireless communication system, the terminal comprising: Transceiver; and The controller is configured as: controlling the transceiver to receive, from a base station, configuration information for configuring a cell group including a plurality of serving cells, the configuration information including first information for configuring a plurality of transmission configuration indicators (TCI) states associated with a physical downlink shared channel (PDSCH) of each downlink bandwidth part (BWP) of each serving cell and second information on a list of at least one serving cell for which the TCI state is simultaneously updated by a medium access control (MAC) control element (CE); controlling the transceiver to receive, from the base station, a MAC CE including information bits corresponding to a plurality of TCI states and information indicating an identity ID of a first serving cell among the plurality of serving cells, wherein one bit of the information bits indicates activation or deactivation of each of the plurality of TCI states, and at least one TCI state among the plurality of TCI states is activated for the first serving cell based on the MAC CE; Based on the second information, identifying whether the first serving cell is included in the at least one serving cell; and In a case where the first serving cell is included in the at least one serving cell, the MAC CE is applied to all of the at least one serving cell.

10. The method according to claim 9, in, The controller is also configured to activate the at least one TCI state for each of the at least one serving cell.

11. The method according to claim 9, in, The controller is further configured to control the transceiver to receive, from the base station, first downlink control information DCI for scheduling a first PDSCH on an activated BWP of the first serving cell, the first DCI including TCI information indicating a first TCI state of the first PDSCH in the at least one TCI state, and to control the transceiver to receive, from the base station, a second DCI for scheduling a second PDSCH on an activated BWP of a second serving cell in the at least one serving cell, the second DCI including TCI information indicating a second TCI state of the second PDSCH in the at least one TCI state, The first PDSCH is received on the first serving cell based on a first TCI state, and the second PDSCH is received on the second serving cell based on a second TCI state.

12. The method according to claim 9, in, The controller is further configured to control the transceiver to receive a user equipment UE capability query message from the base station, and control the transceiver to send a UE capability information message to the base station, wherein the UE capability information message includes information indicating that the terminal supports simultaneous TCI status update across multiple carriers, The UE capability information message indicates that a frequency band of the at least one serving cell is supported by the terminal.

13. A base station in a wireless communication system, the base station comprising: Transceiver; and The controller is configured as: controlling the transceiver to send configuration information for configuring a cell group including a plurality of serving cells to a terminal, the configuration information including first information for configuring a plurality of transmission configuration indicators (TCI) states associated with a physical downlink shared channel (PDSCH) of each downlink bandwidth part (BWP) of each serving cell and second information about a list of at least one serving cell for which the TCI state is simultaneously updated by a medium access control (MAC) control element (CE); and controlling the transceiver to send a MAC CE including information bits corresponding to a plurality of TCI states and information indicating an identity ID of a first serving cell among the plurality of serving cells to the terminal, wherein one bit of the information bit indicates activation or deactivation of each of the plurality of TCI states, and at least one TCI state among the plurality of TCI states is activated for the first serving cell based on the MAC CE, In which, in a case where the first serving cell is included in the at least one serving cell, the MAC CE is applied to all of the at least one serving cell.

14. The base station according to claim 13, in, At least one TCI state indicated by the MAC CE is activated for each of the at least one serving cell, The controller is further configured to control the transceiver to send a first downlink control information DCI of a first PDSCH on an activated BWP that schedules the first service cell to the terminal, the first DCI including TCI information indicating a first TCI state of the first PDSCH in the at least one TCI state, and control the transceiver to send a second DCI of a second PDSCH on an activated BWP that schedules a second service cell in the at least one service cell to the terminal, the second DCI including TCI information indicating a second TCI state of the second PDSCH in the at least one TCI state, The first PDSCH is sent on the first serving cell based on a first TCI state, and the second PDSCH is sent on the second serving cell based on a second TCI state.

15. The base station according to claim 13, in, The controller is further configured to control the transceiver to send a user equipment UE capability query message to the terminal, and control the transceiver to receive a UE capability information message including information indicating that the terminal supports simultaneous TCI update across multiple carriers from the terminal, The UE capability information message indicates that a frequency band of the at least one serving cell is supported by the terminal.

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