A method and apparatus for providing a service for activating or deactivating cell groups in a wireless communication system.

Abstract

To provide a method and apparatus for providing a cell group activation service or deactivation service in a wireless communication system.SOLUTION: A method for a first base station MN executing dual access in a wireless communication system includes a step of transmitting, to a second base station SN, a request message associated with the dual access, a step of receiving, from the second base station, a response message including configuration information on a second cell group (SCG) for the dual acces, a step of identifying whether the response message includes information related to a state of the SCG, and a step of transmitting, to a terminal UE, a radio resource control (RRC) message including the configuration information on the SCG and the information related to the state of the SCG. In the case that an RRC message includes an indicator indicating deactivation of the SCG, the configuration information on the SCG includes information not to perform QoS flow remapping on a data radio bearer (DBR) associated with the SCG.SELECTED DRAWING: Figure 1K

Description

Technical Field

[0001] The present invention relates to a method and an apparatus for providing a service for activating or deactivating a cell group in a wireless communication system.

Background Art

[0002] Looking back on the process of the development of wireless communication from generation to generation, technologies mainly for human-oriented services, such as voice, multimedia, and data, have been developed. After the commercialization of the 5G (5 th generation) communication system, a rapidly increasing number of connected devices are expected to be connected to the communication network. Examples of things connected to the network include vehicles, robots, drones, home appliances, displays, smart sensors provided in various infrastructures, construction machinery, factory equipment, etc. Mobile devices are expected to evolve with various home factors such as augmented reality glasses, virtual reality headsets, and hologram devices. In the 6G (6 th generation) era, efforts are being made to develop an improved 6G communication system to connect hundreds of billions of devices and things and provide various services. For such reasons, the 6G communication system is called a system beyond 5G.

[0003] In the 6G communication system, which is predicted to be realized around 2030, the maximum transmission speed is tera (i.e., 1,000 giga) bps, and the wireless latency is 100 microseconds (μsec). That is, compared with the 5G communication system, the transmission speed in the 6G communication system is 50 times faster, and the wireless latency is reduced to one-tenth.

[0004] To achieve such high data transmission speeds and ultra-low latency, 6G communication systems are being considered for implementation in the terahertz band (e.g., from the 95 GHz band to the 3 terahertz band). In the terahertz band, compared to the millimeter-wave band introduced in 5G, more severe path loss and atmospheric absorption phenomena are expected to make technologies to ensure signal range, i.e., coverage, even more important. To ensure coverage, new technologies such as new waveforms, beamforming, massive MIMO (multiple-input and multiple-output), full-dimensional MIMO (multiple-input and multiple-output), array antennas, and large-scale antennas must be developed as key technologies that offer superior coverage compared to RF (radio frequency) elements, antennas, and OFDM (orthogonal frequency division multiplexing). In addition, new technologies such as metamaterial-based lenses and antennas, high-dimensional spatial multiplexing technologies utilizing OAM (orbital angular momentum), and RIS (reconfigurable intelligent surface) are being discussed to improve the coverage of terahertz band signals.

[0005] Furthermore, in order to improve frequency efficiency and system network performance, development is underway in 6G communication systems to implement technologies such as full duplex technology, where uplink and downlink simultaneously utilize the same frequency resources at the same time; network technology that integrates satellites and HAPS (high-altitude platform stations); network structure innovation technology that supports mobile base stations and enables network operation optimization and automation; dynamic spectrum sharing technology that avoids collisions based on spectrum usage prediction; AI-based communication technology that utilizes AI (artificial intelligence) from the design stage, internalizes end-to-end AI support functions, and achieves system optimization; and next-generation distributed computing technology that enables services with a complexity exceeding the limits of terminal computing power by utilizing ultra-high-performance communication and computing resources (MEC (mobile edge computing), cloud, etc.). Furthermore, efforts continue to enhance connectivity between devices, optimize networks, promote the software-based nature of network entities, and increase the openness of wireless communication through the design of new protocols used in 6G communication systems, the implementation of secure hardware infrastructure, the development of mechanisms for the safe use of data, and the development of technologies related to privacy maintenance.

[0006] Research and development of such 6G communication systems are expected to enable a new dimension of hyper-connected experience through the hyper-connectivity of 6G communication systems, encompassing not only machine-to-machine (M2M) connectivity but also human-to-object (P2M) connectivity. Specifically, it is anticipated that services such as truly immersive XR (extended reality), high-fidelity mobile holograms, and digital replicas will be provided via 6G communication systems. Furthermore, services such as remote surgery, industrial automation, and emergency response, which enhance security and reliability, will be provided via 6G communication systems, leading to applications in diverse fields such as industry, medicine, automotive, and consumer electronics.

[0007] The information described above is provided solely as background information to aid in understanding this disclosure. No determination has been made, nor has any claim been made, regarding whether any of the above constitutes prior art with respect to this disclosure. [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] In next-generation wireless communication systems, carrier aggregation (CA) or dual connectivity (DC) can be used to provide terminals with services that offer high data transmission rates and low transmission delays. However, a method is needed to prevent processing delays that may occur when activating or deactivating carrier aggregation or dual connectivity on a terminal connected to a network. In particular, if a terminal maintains multiple cells in an activated state to use carrier aggregation or dual connectivity, the terminal must perform PDCCH (physical downlink control channel) monitoring for each cell, which significantly drains the terminal's battery. On the other hand, if multiple cells are kept in an inactive state to reduce battery drain, data transmission and reception delays may occur due to the delays that occur when activating multiple cells when using carrier aggregation or dual connectivity. [Means for solving the problem]

[0009] Aspects of this disclosure are intended to address at least the problems and / or drawbacks described above and to provide at least the advantages described below. Accordingly, aspects of this disclosure are intended to provide a method and apparatus for providing a cell group activation service or deactivation service in a wireless communication system.

[0010] Additional embodiments are partially defined in the following description, partially evident from the description, or can be learned through the practice of the embodiments presented.

[0011] A method is provided in one aspect of the present disclosure. The method is a method by which a first base station performs dual access in a wireless communication system, comprising the steps of: transmitting a request message relating to the dual access to a second base station; receiving a response message from the second base station including configuration information for a second cell group (SCG) for the dual access; identifying whether the response message includes information regarding the state of the SCG; and transmitting a radio resource control (RRC) message to a terminal including the configuration information for the SCG and information regarding the state of the SCG, wherein the configuration information for the SCG includes information not to perform QoS flow remapping on a data radio bearer (DRB) associated with the SCG if the RRC message includes an indicator indicating deactivation of the SCG.

[0012] A method is provided in one aspect of the present disclosure. The method is a method by which a terminal performs dual access in a wireless communication system, comprising the steps of: receiving a radio resource control (RRC) message based on a message from a second base station constituting a second cell group (SCG), the RRC message containing configuration information and information regarding the state of the SCG; and transmitting an RRC response message containing information on whether the configuration of the SCG has been successful, wherein the configuration information of the SCG includes information on not performing QoS flow remapping on a data radio bearer (DRB) associated with the SCG if the RRC message contains an indicator indicating deactivation of the SCG.

[0013] Apparatus is provided in other aspects of the present disclosure. The apparatus is a first base station for performing dual access in a wireless communication system, the first base station comprising a transceiver unit and at least one processor coupled to the transceiver unit, the at least one processor transmitting a request message relating to the dual access to a second base station, receiving a response message from the second base station containing configuration information relating to a second cell group (SCG) for the dual access, identifying whether the response message contains information relating to the state of the SCG, transmitting a radio resource control (RRC) message containing the configuration information of the SCG and information relating to the state of the SCG to a terminal, wherein the configuration information of the SCG includes information not to perform QoS flow remapping on a data radio bearer (DRB) associated with the SCG if the RRC message contains an indicator indicating deactivation of the SCG.

[0014] Other aspects, advantages, and notable features of this disclosure will become apparent to those skilled in the art from the following detailed description, which discloses various embodiments of this disclosure and is referenced in conjunction with the drawings. [Brief explanation of the drawing]

[0015] [Figure 1A] This figure shows the structure of an LTE system according to one embodiment of the present disclosure. [Figure 1B] This figure shows the wireless protocol structure in an LTE system according to one embodiment of the present disclosure. [Figure 1C] This figure shows the structure of a next-generation wireless communication system according to one embodiment of the present disclosure. [Figure 1D] This figure shows the wireless protocol structure of a next-generation wireless communication system according to one embodiment of the present disclosure. [Figure 1E] This figure illustrates a procedure for efficiently using a fairly wide frequency bandwidth to provide services to a terminal in a next-generation wireless communication system according to one embodiment of the present disclosure. [Figure 1F]This figure illustrates a procedure for switching a terminal from RRC idle mode to RRC connected mode in a next-generation wireless communication system according to one embodiment of the present disclosure, and for setting bearer setting information, cell group setting information or cell setting information for connection, or channel measurement setting information in the terminal. [Figure 1G] This figure illustrates a state transition or partial bandwidth switching procedure according to one embodiment of the present disclosure. [Figure 1H] This figure shows a DRX setting or DRX operation method that can conserve the battery of a terminal according to one embodiment of the present disclosure. [Figure 1I] This figure illustrates a concept for operating a dormant partial bandwidth in an activated SCell or PSCell according to one embodiment of the present disclosure. [Figure 1J] This figure illustrates how an RRC deactivation mode terminal operates according to one embodiment of the present disclosure. [Figure 1K] One embodiment of the present disclosure is shown in the diagram illustrating a signaling procedure for setting up or disabling a dual connection technology in a next-generation wireless communication system, or for activating, restarting, stopping, or deactivating a secondary cell group that has been set up with a dual connection technology. [Figure 1L] One embodiment of the present disclosure shows a second signaling procedure for setting up or disabling a dual connection technology, or setting up or disabling, activating or restarting, or suspending or deactivating a secondary cell group that has been set up in a dual connection technology. [Figure 1M] One embodiment of the present disclosure shows a third signaling procedure for setting up or disabling a dual connection technology, or setting up or disabling, activating or restarting, or suspending or deactivating a secondary cell group configured in a dual connection technology. [Figure 1N] This figure shows the operation of a terminal according to one embodiment of the present disclosure. [Figure 10]It is a diagram showing the structure of a terminal according to an embodiment of the present disclosure. [Figure 1P] In a wireless communication system according to an embodiment of the present disclosure, it is a diagram showing the block configuration of a base station.

Embodiments for Carrying Out the Invention

[0016] The following description with reference to the drawings is provided to assist in a comprehensive understanding of various embodiments of the present disclosure. To assist in that understanding, it includes various specific details, which are regarded as merely exemplary. Accordingly, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. Further, descriptions related to well-known functions and structures are omitted for clarity and brevity.

[0017] The following description and the terms and words used are not limited to bibliographical meanings and are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Accordingly, it will be apparent to those skilled in the art that the following description related to various embodiments of the present disclosure is provided for the purpose of illustration only and not for the purpose of limiting the present disclosure.

[0018] The singular forms "a", "an", and "the" are to be understood to include plural referents unless the context clearly indicates otherwise. Thus, for example, a reference to "a component surface" includes a reference to one or more such surfaces.

[0019] In the description of the present disclosure, a detailed description of related technologies is omitted when it is determined that it unnecessarily obscures the essence of the present disclosure. Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0020] Throughout this disclosure, the expression "at least one of a, b, or c" means a only, b only, c only, both a and b, both a and c, both b and c, all of a, b and c, or variations thereof.

[0021] In this specification, layers are also referred to as entities.

[0022] In the following, terms used to identify access nodes, network entities, messages, interfaces between network entities, and various parts of the identification information used in the following description are illustrative for illustrative purposes only. Therefore, this disclosure is not limited to the terms described below, and other terms with equivalent technical meanings may be used.

[0023] For the sake of clarity, this disclosure uses the terms and names defined in the 3GPP® LTE (3rd Generation Partnership Project Long Term Evolution) standard. However, this disclosure is not limited to the aforementioned terms and names and may apply equally to systems based on other standards. In this disclosure, eNB (evolved node B) is used interchangeably with gNB (next-generation node B) for the sake of clarity. That is, a base station described as an eNB refers to a gNB.

[0024] In this disclosure, "cell" refers to a PCell (primary cell) or SCell (secondary cell) (e.g., a SCell set in a master cell group (MCG)), or a PSCell (e.g., a PCell in a secondary cell group (SCG)), or a SCell (e.g., a SCell set in a secondary cell group (SCG)).

[0025] Figure 1A is a diagram showing the structure of an LTE system according to one embodiment of the present disclosure.

[0026] Referring to Figure 1A, as illustrated, the LTE system's radio access network consists of next-generation base stations (Evolved Node B (eNB), Node B, or BS) 1a-05, 1a-10, 1a-15, 1a-20, MME (mobility management entity) 1a-25, and S-GW (serving-gateway) 1a-30. User terminals (UE (user equipment) or terminals) 1a-35 connect to the external network via eNBs 1a-05 to 1a-20 and S-GW 1a-30.

[0027] In Figure 1A, eNBs 1a-05 to 1a-20 correspond to existing node B of the UMTS (universal mobile telecommunications system). The eNBs are connected to UE 1a-35 via a radio channel and play a more complex role than existing node B. In an LTE system, all user traffic, including real-time services such as VoIP (voice over Internet protocol) via the Internet Protocol, is served via a shared channel. Therefore, an entity is needed to schedule traffic by combining state information such as the UE's buffer state, available transmission power state, and channel state, and this is the role of eNBs 1a-05 to 1a-20. A single eNB typically controls multiple cells. For example, to achieve a transmission speed of 100 Mbps, an LTE system uses orthogonal frequency division multiplexing (OFDM) as its wireless connectivity technology, for example, in a 20 MHz bandwidth. Furthermore, an adaptive modulation and coding (AMC) method is applied, which determines the modulation scheme and channel coding rate according to the channel status of the terminal. S-GW 1a-30 is a device that provides data bearers, and generates and removes data bearers under the control of MME 1a-25. MME 1a-25 is a device that is responsible for various control functions as well as mobility management functions for UE 1a-35, and is connected to multiple base stations.

[0028] Figure 1B is a diagram showing the wireless protocol structure in an LTE system according to one embodiment of the present disclosure.

[0029] Referring to Figure 1B, the LTE system's wireless protocol includes PDCP (packet data convergence protocol) 1b-05, 1b-40, RLC (radio link control) 1b-10, 1b-35, MAC (medium access control) 1b-15, 1b-30, and PHY (physical) 1b-20, 1b-25 in both the UE (terminal) and LTE eNB (electronic network node). PDCP layers 1b-05 and 1b-40 are responsible for operations such as IP (Internet protocol) header compression / decompression. The main functions of PDCP layers 1b-05 and 1b-40 can be summarized as follows.

[0030] - Header compression and decompression functionality: Limited to ROHC (robust header compression)

[0031] - User data transmission function

[0032] - In-sequence delivery of upper layer PDUs at PDCP re-establishment procedure for RLC AM

[0033] - DC split bearers for RLC AM support: PDCP PDU routing for transmission and PDCP PDU reordering for reception.

[0034] - Duplicate detection of lower layer SDUs in the PDCP re-establishment procedure for RLC AM.

[0035] - Retransmission of PDCP SDUs at handover and, for split bearers in DC, of ​​PDCP PDUs at PDCP data-recovery procedure, for RLC AM.

[0036] - Encryption and deciphering functions

[0037] - Timer-based SDU deletion function (Timer-based SDU discard in uplink)

[0038] RLC (Radio Link Control) layers 1b-10 and 1b-35 reconfigure PDCP PDUs (protocol data units) or RLC SDUs (service data units) to the appropriate size and perform ARQ operations, etc. The main functions of RLC are summarized below.

[0039] - Data transmission function of upper layer PDUs (Transfer of upper layer PDUs)

[0040] - Error correction function via ARQ (only for AM data transfer)

[0041] - Concatenation, segmentation, and reassembly of RLC SDUs (only for UM and AM data transfer)

[0042] - RLC data PDUs re-segmentation function (only for AM data transfer)

[0043] - Reordering function for RLC data PDUs (only for UM and AM data transfer)

[0044] - Duplicate detection function (only for UM and AM data transfer)

[0045] - Error detection function (Protocol error detection (only for AM data transfer))

[0046] - RLC SDU deletion function (RLC SDU discard (only for UM and AM data transfer))

[0047] -RLC re-establishment function

[0048] MAC layers 1b-15 and 1b-30 are linked to various RLC layers configured on a single terminal, performing the operations of multiplexing RLC PDUs into MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of MAC can be summarized as follows:

[0049] - Mapping function between logical channels and transport channels

[0050] - Multiplexing / demultiplexing of MAC SDUs belonging to one or different logical channels into / from transport blocks (TB) delivered to / from the physical layer on transport channels.

[0051] - Scheduling information reporting function

[0052] - Error correction function via HARQ

[0053] - Priority handling between logical channels of one UE (Vertical Engine)

[0054] - Priority handling between UEs via dynamic scheduling

[0055] - MBMS service identification function

[0056] -Transport format selection function

[0057] - Padding function

[0058] The PHY (physical) layers 1b-20 and 1b-25 perform the operations of channel coding and modulation of higher-level data, converting it into OFDM symbols and transmitting them over the radio channel, or demodulating OFDM symbols received over the radio channel, channel decoding them, and transmitting them to the higher layer.

[0059] Figure 1C is a diagram showing the structure of a next-generation wireless communication system according to one embodiment of the present disclosure.

[0060] Referring to Figure 1C, as illustrated, the radio access network of the next-generation wireless communication system (NR system or 5G system) consists of next-generation base stations (NR gNB or NR base station (New Radio Node B)) 1c-10 and NR CN (new radio core network) 1c-05. User terminals (NR UE (new radio user equipment) or terminals) 1c-15 connect to the external network via NR gNB 1c-10 and NR CN 1c-05.

[0061] In Figure 1C, the NR gNB 1c-10 corresponds to the eNB (Evolved Node B) of an existing LTE system. The NR gNB 1c-10 is connected to the NR UE 1c-15 via a radio channel and provides a service even better than the existing Node B. In next-generation wireless communication systems (NR systems or 5G systems), all user traffic is served via a shared channel, so a device is needed to schedule by combining state information such as the UE's buffer state, available transmission power state, and channel state, and this is the role of the NR NB 1c-10. One NR gNB 1c-10 typically controls multiple cells. Currently, to realize ultra-high-speed data transmission compared to LTE, it has more than the existing maximum bandwidth, uses orthogonal frequency division multiplexing (OFDM) as the wireless connection technology, and additionally incorporates beamforming technology. Furthermore, an adaptive modulation and coding (AMC) method is applied, which determines the modulation scheme and channel coding rate according to the channel status of the terminal. The NR CN 1c-05 performs functions such as mobility assistance, bearer configuration, and QoS (quality of service) configuration. The NR CN 1c-05 is a device that is responsible for various control functions as well as mobility management functions for terminals, and is connected to multiple base stations. In addition, the next-generation wireless communication system (NR system or 5G system) is also linked with the existing LTE system, and the NR CN 1c-05 is connected to the MME 1c-25 via a network interface. The MME 1c-25 is connected to the existing base station, eNB 1c-30.

[0062] Figure 1D is a diagram showing the wireless protocol structure of a next-generation wireless communication system according to one embodiment of the present disclosure.

[0063] Referring to Figure 1D, the wireless protocol for the next-generation wireless communication system includes NR SDAP (service data adaptation protocol) 1d-01, 1d-45, NR PDCP 1d-05, 1d-40, NR RLC 1d-10, 1d-35, NR MAC 1d-15, 1d-30, and NR PHY 1d-20, 1d-25 at the terminal and NR base station, respectively.

[0064] The main functions of NR SDAP 1d-01 and 1d-45 include some of the following functions:

[0065] - User data transfer function (transfer of user plane data)

[0066] - Mapping function between a QoS flow and a DRB for both DL and UL for both uplink and downlink.

[0067] - A function to mark QoS flow IDs in both DL and UL packets for both uplink and downlink.

[0068] - For upward-link SDAP PDUs, a function to map reflective QoS flow to the data bearer (reflective QoS flow to DRB mapping for the UL SDAP PDUs)

[0069] For the NR SDAP hierarchy, terminals configure whether to use the NR SDAP hierarchy header or functions for each PDCP hierarchy, bearer, or logical channel using RRC messages. If the SDAP header is configured, the NAS reflective QoS 1-bit indicator and AS reflective QoS 1-bit indicator in the SDAP header instruct the terminal to update or reset the mapping information related to the QoS flow between the uplink and downlink and the data bearer. The SDAP header includes QoS flow ID information indicating QoS. QoS information is used as data processing priority and scheduling information to support smooth service.

[0070] The main functions of NR PDCP 1d-05, 1d-40 include some of the following functions:

[0071] - Header compression and decompression functionality: ROHC only

[0072] - User data transmission function

[0073] - In-sequence delivery of upper layer PDUs

[0074] - Out-of-sequence delivery of upper layer PDUs

[0075] - PDCP PDU reordering function for reception

[0076] - Duplicate detection of lower layer SDUs

[0077] - PDCP SDUs retransmission function

[0078] - Encryption and deciphering functions

[0079] - Timer-based SDU deletion function (Timer-based SDU discard in uplink)

[0080] The NR PDCP hierarchy's reordering function refers to the function of rearranging PDCP PDUs received in lower layers based on their PDCP SN (sequence number), and includes the function of transmitting the data to higher layers in the rearranged order. Alternatively, the NR PDCP hierarchy's reordering function may include a function for immediate transmission without considering the procedure, and a function for recording lost PDCP PDUs after rearranging the order. The NR PDCP hierarchy's reordering function may also include a function for reporting the status of lost PDCP PDUs to the sender, and a function for requesting retransmission of lost PDCP PDUs.

[0081] The main functions of NR RLC 1d-10, 1d-35 include some of the following functions:

[0082] - Data transmission function of upper layer PDUs (Transfer of upper layer PDUs)

[0083] - In-sequence delivery of upper layer PDUs

[0084] - Out-of-sequence delivery of upper layer PDUs

[0085] - Error correction function via ARQ

[0086] - Concatenation, segmentation, and reassembly functions of RLC SDUs.

[0087] - RLC data PDU resegmentation function

[0088] - Reordering function for RLC data PDUs

[0089] - Duplicate detection function

[0090] - Error detection function (Protocol error detection)

[0091] -RLC SDU deletion function (RLC SDU discard)

[0092] -RLC re-establishment function

[0093] The in-sequence delivery function of the NR RLC hierarchy refers to the function of sequentially transmitting RLC SDUs received from lower layers to higher layers. If a single RLC SDU is received split into several RLC SDUs, the function of reassembling and transmitting them is included. The in-sequence delivery function of the NR RLC hierarchy also includes the function of rearranging received RLC PDUs based on the RLC SN (sequence number) or PDCP SN (sequence number), rearranging the order, recording lost RLC PDUs, and providing status reports regarding lost RLC PDUs to the transmitting side. The in-sequence delivery function of the NR RLC hierarchy also includes the function of requesting retransmission regarding lost RLC PDUs, and if there are lost RLC SDUs, the function of sequentially transmitting only the RLC SDUs up to the lost RLC SDU to higher layers. The sequential transmission function of the NR RLC hierarchy includes the function of sequentially transmitting all RLC SDUs received before the timer started to the next level, even if some RLC SDUs are lost, provided that the predetermined timer has expired, or, even if some RLC SDUs are lost, providing all RLC SDUs received up to the present to the next level, provided that the predetermined timer has expired. It also processes RLC PDUs in the order they are received (regardless of the order of their sequence numbers), transmits them to the NR PDCP hierarchy out of sequence, and, if they are segments, receives the segments stored in the buffer or received later, reconstructs them into a single complete RLC PDU, processes them, and transmits them to the NR PDCP hierarchy. The NR RLC hierarchy does not include a concatenation function; the concatenation function is performed in the NR MAC hierarchy or replaced by the multiplexing function of the NR MAC hierarchy.

[0094] The out-of-sequence delivery function of the NR RLC hierarchy refers to the function of immediately transmitting RLC SDUs received from lower levels to higher levels, regardless of order. This includes the function of reassembling and transmitting RLC SDUs if they are received as multiple RLC SDUs, saving the RLC SN or PDCP SN of received RLC PDUs to sort them, and recording any lost RLC PDUs.

[0095] NR MAC 1d-15, 1d-30 are linked to various NR RLC hierarchies configured in a single terminal, and the main functions of NR MAC include some of the following: - Mapping function between logical channels and transport channels.

[0096] - MAC SDUs multiplexing and demultiplexing functions (Multiplexing / demultiplexing of MAC SDUs)

[0097] - Scheduling information reporting function

[0098] - Error correction function via HARQ

[0099] - Priority handling between logical channels of one UE (Logical User Interface)

[0100] - Priority handling between UEs via dynamic scheduling.

[0101] - MBMS service identification function

[0102] -Transport format selection function

[0103] - Padding function

[0104] NR PHY layers 1d-20 and 1d-25 perform the operations of channel coding and modulation of higher-level data, converting it into OFDM symbols and transmitting it over the radio channel, or demodulating OFDM symbols received over the radio channel, channel decoding them, and transmitting them to the higher layer.

[0105] In next-generation wireless communication systems, the frequency bandwidth is also considerably wide due to the use of considerably high-bandwidth frequencies. However, supporting such a wide bandwidth in terminal implementation requires a high level of complexity and incurs high costs. Therefore, in next-generation wireless communication systems, the concept of bandwidth part (BWP) is introduced, and multiple bandwidth parts (BWP) are set in a single cell (Spcell or Scell), and data is transmitted and received using one or more bandwidth parts according to the instructions of the base station.

[0106] This disclosure describes the specific operation of a state transition method or partial bandwidth switching method that takes into account the state of the Scell ​​and the multiple partial bandwidths set in the Scell ​​when introducing a dormant partial bandwidth according to one embodiment. Furthermore, this disclosure proposes a method for managing the dormant mode on a partial bandwidth-level basis for state transitions or a partial bandwidth switching method, and proposes specific operation of the partial bandwidth depending on the state of each SCell or the state or mode (activated, deactivated, or dormant) of each partial bandwidth.

[0107] In one embodiment, the Disclosure proposes a method for setting first channel measurement configuration information for a cell or partial bandwidth via an RRC message or MAC CE in order to quickly activate the cell or partial bandwidth, and for instructing a terminal via the RRC message or MAC CE to apply and use (activate) the first channel measurement configuration information. Thus, the Disclosure proposes a method for enabling a terminal to quickly measure the channel signal (e.g., reference signal) related to the cell or partial bandwidth, quickly report the measurement results to the base station, and quickly activate the cell or partial bandwidth.

[0108] In one embodiment, activating a cell or partial bandwidth means a procedure in which a terminal monitors PDCCH, a procedure in which a base station transmits PDCCH to a terminal, or a procedure in which a base station transmits downlink data (PDSCH) to a terminal. In another embodiment, activating a cell or partial bandwidth means a procedure in which a terminal transmits uplink data (PUSCH), a procedure in which a terminal transmits HARQ ACK or NACK as a result of measurement in PUCCH, or a procedure in which a terminal transmits SRS (sounding reference signal). Activating a cell or partial bandwidth also means a procedure in which a terminal measures a channel measurement signal (SSB (synchronization signal block), CSI-RS (channel state information reference signal), or RS (reference signal)) transmitted by a base station, or a procedure in which a terminal measures a channel measurement signal transmitted by a base station and reports the result.

[0109] According to one embodiment, the first channel measurement setting information includes setting information relating to a channel measurement signal for a specific terminal (or terminal) in a cell or partial bandwidth. For example, the channel measurement setting information includes the period of the channel measurement signal, the number of signals to be transmitted, the period during which the signal is transmitted, an offset relating to the time during which the signal is transmitted, or the time length between transmitted signals. Alternatively, the channel measurement setting information includes a list relating to a plurality of channel measurement signals to be transmitted, a time transmission resource (or frequency transmission resource) indicating the position of the transmitted signals, a transmission resource (time transmission resource or frequency transmission resource) reporting the measured results, or a period for reporting the measured results.

[0110] According to one embodiment, the first channel measurement setting information set by the RRC message includes a plurality of channel measurement signal information. By indicating one of the plurality of channel measurement signal information or beam setting information set by the RRC message, MAC CE, or DCI, the terminal applies or uses the indicated channel measurement signal information or beam setting information to perform a channel measurement or report a channel measurement. According to another embodiment, channel measurement signal information is set or indicated by the RRC message or MAC CE, and the terminal applies or uses the set (or indicated) channel measurement signal information to perform a channel measurement or report a channel measurement.

[0111] According to one embodiment, the first channel measurement setting information is set differently for each cell or partial bandwidth for each of the multiple cells or partial bandwidths set by the RRC message, and includes beam-related setting information (TCI (transmission configuration indication) state or QCL (quasi co-location)) such as beam direction, beam number or beam position, to help the terminal easily measure the transmission resources for measuring the channel. The first channel measurement setting information also includes a TA (timing advance) value (or offset value) for synchronizing the base station's downlink signal or uplink signal, a timer (TAT: time alignment timer) or timer value (TAT value) indicating the validity of the TA value, to enable the terminal to correctly perform channel measurement or channel measurement reporting.

[0112] The first channel measurement configuration information proposed in this disclosure can only be configured for the downlink bandwidth configuration information of each cell. In other words, the first channel measurement configuration information proposed in this disclosure is not configured for the uplink bandwidth configuration information of each cell. This is because, for the downlink, the terminal can first measure the channel and then report the measurement results for that channel or cell, and only then can it correctly receive the PDCCH and follow the instructions to the base station.

[0113] The first channel measurement configuration information proposed in this disclosure is initially deactivated when configured by an RRC message or after a handover, and subsequently activated by the MAC control information, PDCCH DCI information, or RRC message proposed in this disclosure. When configured by an RRC message, initial deactivation allows the base station to easily manage the terminal's cell state or channel measurement procedure, and ensures accurate timing regarding when and how the terminal performs channel measurements without RRC message processing delay issues.

[0114] According to one embodiment of this disclosure, a single cell (Spcell, Pcell, Pscell, or Scell) is configured with multiple partial bandwidths for each downlink or uplink, and is operated by configuring active partial bandwidths (active DL or ULB WP), dormant partial bandwidths (dormant BWP or dormant DL BWP), or inactive partial bandwidths (inactive or deactivated DL / ULB WP) via partial bandwidth switching. That is, for each cell, a partial bandwidth for either the downlink or uplink is transitioned to an active state to increase the data transmission rate in a manner similar to carrier integration technology. Alternatively, the downlink partial bandwidth can be transitioned to or switched to a dormant partial bandwidth to conserve battery power by preventing the terminal from performing PDCCH monitoring for the cell, while the terminal can perform channel measurements for the downlink partial bandwidth and report the channel measurement results to support the subsequent activation of the cell or partial bandwidth earlier. In a single cell, the downlink (or uplink) partial bandwidth can be transitioned to an inactive state to conserve battery power for the terminal. For each cell, state transition instructions or partial bandwidth switching instructions are set and instructed by RRC messages, MAC CE, or PDCCH DCI (downlink control information).

[0115] According to one embodiment, the dormant partial bandwidth is extended to and applied to duplex technology, for example, to the PSCell of a secondary cell group. According to another embodiment, when the dormant partial bandwidth is extended to the concept of cell group suspension or cell group deactivation, a terminal configured with duplex technology is instructed to suspend or deactivate one cell group (e.g., a secondary cell group), thereby reducing the terminal's power consumption by stopping data transmission or reception, stopping PDCCH monitoring, or intermittently monitoring PDCCH based on a very long period in the instructed cell group. Furthermore, the terminal instructed to suspend or deactivate a cell group performs channel measurement procedures in the cell group instructed to suspend or deactivate, and reports the channel measurement results to the network (e.g., a master cell group or a secondary cell group), thereby helping to quickly activate the duplex technology.

[0116] According to one embodiment, for cell groups that have been instructed to be stopped or deactivated, the terminal either performs the above procedure or maintains and saves the cell group configuration information without discarding / deactivating it. The terminal also recovers the cell group configuration information in response to a network cell group activation or restart instruction. For example, the terminal saves or maintains the cell group configuration information set on the terminal (e.g., the configuration information for each PDCP, RLC, or MAC hierarchy, or the bearer configuration information), or the configuration information for each cell as is.

[0117] However, if a cell group is suspended or deactivated, the terminal will suspend the bearer or the bearer's RLC bearer, or suspend transmission (or data transmission, e.g., SCG transmission) in the cell group. If the terminal receives a resume or activation instruction for a cell group that has been instructed to be suspended or deactivated, the terminal will resume, restore, or further apply the cell group's configuration information and resume transmission (e.g., SCG transmission) to the bearer, RLC bearer, or cell group. Alternatively, if the terminal receives a resume or activation instruction for a cell group that has been instructed to be suspended or deactivated, the terminal will resume data transmission or reception, resume PDCCH monitoring, provide channel measurement reports, or reactivate periodically configured transmission resources.

[0118] If a cell group is discontinued or deactivated, discontinuing a bearer (a bearer using RLC UM mode or a bearer using RLC AM mode) means discontinuing the PDCP or RLC hierarchy (or discontinuing data transmission, data reception, or data processing), and in the MAC hierarchy, not transmitting (or receiving) data related to the bearer (or data corresponding to the logical channel identifier corresponding to the bearer) (or not selecting the logical channel identifier in the LCP (logical channel prioritization) procedure). The procedure for discontinuing the PDCP hierarchy may be carried out by the embodiments specifically proposed below in this disclosure.

[0119] If a cell group is discontinued or deactivated, discontinuing an RLC bearer (an RLC bearer using RLC UM mode or an RLC bearer using RLC AM mode) means discontinuing the RLC hierarchy (or discontinuing data transmission, data reception, or data processing), and in the MAC hierarchy, not transmitting (or receiving) data related to the bearer (or data corresponding to the logical channel identifier corresponding to the bearer) (or not selecting the logical channel identifier in the LCP (logical channel prioritization) procedure). Discontinuing an RLC bearer means that the PDCP hierarchy linked to the RLC hierarchy will continue to perform data processing. For example, the PDCP hierarchy linked to the discontinued RLC bearer will process and transmit data or receive and process data via other RLC bearers (e.g., an RLC bearer belonging to a different cell group (e.g., MCG) than the cell group (e.g., SCG)).

[0120] If a cell group is discontinued or deactivated, discontinuing transmission to the cell group (e.g., SCG transmission) means that, in the MAC layer, data related to bearers belonging to the cell group (bearers using RLC UM mode or bearers using RLC AM mode) (or data corresponding to logical channel identifiers corresponding to bearers) will not be transmitted (or, in the LCP (logical channel prioritization) procedure, logical channel identifiers will not be selected). However, discontinuing transmission to the cell group (e.g., SCG transmission) means that data processing or data pre-processing is possible in the PDCP or RLC layer. For example, higher-level data (or upward link data) will not be transmitted to the cell group, but data processing will be performed in advance for transmission in the PDCP, RLC, or MAC layer.

[0121] When a cell group is restarted or activated, restarting a bearer (a bearer using RLC UM mode or a bearer using RLC AM mode) means restarting the PDCP or RLC hierarchy (or restarting data transmission, data reception, or data processing), and in the MAC hierarchy, transmitting (or receiving) data related to the bearer (or corresponding to the logical channel identifier corresponding to the bearer) (or selecting the logical channel identifier in the LCP (logical channel prioritization) procedure).

[0122] When a cell group is restarted or activated, restarting an RLC bearer (either an RLC bearer using RLC UM mode or an RLC bearer using RLC AM mode) means restarting the RLC hierarchy (or restarting data transmission, data reception, or data processing), and in the MAC hierarchy, transmitting (or receiving) data related to the bearer (or corresponding to the logical channel identifier corresponding to the bearer) (or selecting the logical channel identifier in the LCP (logical channel prioritization) procedure). Restarting an RLC bearer means transmitting data or receiving data from the PDCP hierarchy, which is linked to the RLC hierarchy.

[0123] When a cell group is restarted or activated, restarting transmissions related to the cell group (e.g., SCG transmission) means that, in the MAC layer, data related to bearers belonging to the cell group (bearers using RLC UM mode or bearers using RLC AM mode) (or data corresponding to the logical channel identifier corresponding to the bearer) is transmitted (or, in the LCP (logical channel prioritization) procedure, the logical channel identifier is targeted and selected). However, restarting transmissions related to the cell group (e.g., SCG transmission) means that data processing or data pre-processing is possible in the PDCP or RLC layer. For example, higher-level data (or upward link data) can be transmitted to the cell group, and data processing can be performed in advance for transmission in the PDCP, RLC, or MAC layer.

[0124] In other embodiments, if a cell group is suspended or deactivated, the bearer using RLC UM mode (or RLC bearer) is suspended, and the PDCP or RLC layer is suspended, resulting in the suspension of data transmission / reception or data processing. Alternatively, data transmission or reception is suspended at the MAC layer. However, for bearers using RLC AM mode (or RLC bearer), transmission related to the cell group is suspended, allowing data processing to continue at the PDCP or RLC layer, or causing data transmission or reception to be suspended at the MAC layer. This is because, when the security key is changed, the PDCP re-establishment procedure for RLC AM bearers includes a retransmission (or regeneration) procedure (therefore, if the security key is not changed, the data processing speed is reduced. Also, if the security key is changed, no data loss occurs due to the retransmission (or regeneration) procedure), but for RLC UM bearers, there is no retransmission (or regeneration) procedure. Therefore, if the RLC UM bearer performs the data processing procedure in advance, data loss will occur within the terminal (if the security key is not changed, the data processing speed may be reduced. However, if the security key is changed, there is no retransmission (or regeneration) procedure, and data loss occurs because both the data are discarded during the re-establishment procedure of the PDCP and RLC layers). Accordingly, different procedures are applied to bearers using RLC AM mode (or RLC bearers) and bearers using RLC UM mode (or RLC bearers). Procedures for discontinuing the PDCP hierarchy may be applied to the embodiments specifically proposed below in this disclosure.

[0125] The first channel measurement configuration information for early cell group or cell (SpCell(Pcell or PSCell) or SCell) activation is contained in cell group configuration information or cell (SpCell(Pcell or PSCell) or SCell) configuration information, previously configured cell group configuration information or cell (SpCell(Pcell or PSCell) or SCell) configuration information, or in a message instructing cell group or cell (SpCell(Pcell or PSCell) or SCell) activation or restart (e.g., RRC message, RRCReconfiguration, MAC control information, or DCI (downlink control information) for PDCCH).

[0126] According to one embodiment, in order to quickly activate a cell group (or cell) or for a terminal to quickly perform channel measurement in a cell, the base station temporarily transmits many or good channel measurement signals, and the first channel measurement setting information includes, in the setting information of a cell in a cell group (e.g., PCell, PSCell, or SCell), frequent channel measurement signals (e.g., radio resource, TRS (temporary reference signal), SSB (synchronization signal block), CSI-RS (channel state information reference signal), or RS (reference) signals. The first channel measurement setting information includes setting information such as the period related to the signal, or transmission resource information to be transmitted (frequency or time transmission resource to which the frequent channel measurement signal is transmitted), interval, number of times (number of times the frequent channel measurement signal is transmitted), timer value (time to which the frequent channel measurement signal is transmitted), or time interval (the interval to which the frequent channel measurement signal is transmitted (e.g., offset of time unit (slot, subframe, or symbol))). The first channel measurement setting information also includes setting information such as the transmission resource, period, interval, timing, or offset to which the terminal must report the measured results.

[0127] The first channel measurement configuration information sets a short reporting cycle (or transmission resource) for the terminal to report channel measurement results, or configures transmission resources for channel measurement so that the base station transmits many channel measurement signals (or transmission resources (e.g., radio resource or TRS (temporary reference signal))) more frequently or more often to support faster channel measurement or measurement of many signals by the terminal. The first channel measurement configuration information includes configuration information relating to channel measurement signals for a specific terminal (or terminal) in a cell or partial bandwidth. For example, the first channel measurement configuration information may include the cycle of the channel measurement signal, the number of signals transmitted, the duration for which the signal is transmitted, the offset relating to the time of transmission, or the time length between transmitted signals. Alternatively, the first channel measurement configuration information may include a list relating to multiple channel measurement signals to be transmitted, a time transmission resource (or frequency transmission resource) indicating the position of the transmitted signals, a transmission resource (time transmission resource or frequency transmission resource) for reporting the measured results, or the cycle for reporting the measured results.

[0128] According to one embodiment, the first channel measurement setting information is set differently for each cell or partial bandwidth for each of the multiple cells or partial bandwidths set by the RRC message, and beam-related setting information (TCI (transmission configuration indication) state or QCL (quasi co-location)) such as beam direction, beam number or beam position is set together to help the terminal easily measure the transmission resources for measuring the channel.

[0129] According to one embodiment, the first channel measurement setting information enables the terminal to correctly perform channel measurement or channel measurement reporting by setting a TA (timing advance) value (or offset value) for synchronizing the base station's downward link signal or upward link signal, a timer (TAT: time alignment timer) indicating the validity of the TA value, or a timer value (TAT value). The first channel measurement setting information set by an RRC message also includes multiple channel measurement signal information. The first channel measurement setting information enables the terminal to apply or use the specified channel measurement signal information or beam setting information to perform channel measurement or report channel measurement by specifying one of the multiple channel measurement signal information set by an RRC message, MAC CE, or DCI. The instruction method defines a mapping between a bitmap, index, identifier, and each set channel measurement signal information, and provides instructions based on this.

[0130] In another embodiment, channel measurement signal information is set or instructed via an RRC message or MAC CE, causing the terminal to apply or use the set (or instructed) channel measurement signal information to perform channel measurement or to report channel measurement.

[0131] The first channel measurement configuration information according to one embodiment of the present disclosure is initially deactivated when configured by an RRC message or after a handover, and subsequently activated by the MAC control information, PDCCH DCI information, or RRC message proposed in the present disclosure. When configured by an RRC message, initializing the configuration to a deactivated state allows the base station to easily manage the terminal's cell state or channel measurement procedure, and to accurately perform the timing of when and how the terminal performs channel measurement without delay issues in RRC message processing.

[0132] The first channel measurement setting information according to one embodiment of the present disclosure can only be set for the downward link partial bandwidth setting information of each cell. That is, the first channel measurement setting information according to one embodiment of the present disclosure is not set for the upward link partial bandwidth setting information of each cell. This is because, for the downward link, the terminal must first measure the channel, report the measurement results for that channel or cell, and then correctly receive the PDCCH and follow the instructions to the base station.

[0133] According to one embodiment, a message instructing activation or restart of a cell group or cell (SpCell (Pcell or PSCell) or SCell) (e.g., RRC message, RRCReconfiguration, MAC control information, or DCI (downlink control information) of a PDCCH) includes second channel measurement configuration information for measuring the signals of the cells (PSCell, PCell, or SCell) in the cell group. The second channel measurement configuration information includes general channel measurement configuration information such as the transmission resources, period, time interval or number of times for the channel measurement signal, or the transmission resources, period, and time interval for channel measurement reporting.

[0134] In this disclosure, the terminal's first channel measurement setting information or second channel measurement setting information is applied under the following conditions, and the results of the channel measurement are reported to the base station.

[0135] 1> If the terminal receives a message (e.g., a PDCCH indicator, MAC control information, or RRC message) to activate (or restart) a cell (PCell, PSCell, or SCell) or cell group (or if the cell group was previously inactive),

[0136] 2> If the terminal is configured with first channel measurement settings,

[0137] 3> The terminal confirms, based on the first channel measurement setting information, that the base station will frequently transmit many channel measurement signals, and measures many or frequent channel measurement signals temporarily (e.g., up to the time interval set by the first channel measurement setting information (e.g., subframe, slot, or symbol), or for a promised (or predetermined) time interval considering the offset, or for a certain period of time (e.g., while the timer is running)), or until the first condition is satisfied. The terminal also reports the measured channel measurement results based on the period or transmission resource set by the first channel measurement setting information, up to the time interval set by the first channel measurement setting information (e.g., subframe, slot, or symbol), or for a promised (or predetermined) time interval considering the offset, or for a certain period of time (e.g., while the timer is running), or until the first condition is satisfied. By enabling the terminal to measure and report frequent channel measurement signals more quickly, the terminal can activate (or restart) cells (PCell, SCell, or PSCell) or cell groups more quickly, or receive scheduling information sooner. If the second channel measurement setting information is set on the terminal after a time interval set by the first channel measurement setting information (e.g., subframe, slot, or symbol), or after a promised (or predetermined) time interval or time (e.g., when the timer expires), or after the first condition is satisfied, the application of the first channel measurement setting information is stopped or canceled, and the channel measurement signal is measured using the second channel measurement setting information. For example, the terminal may fall back from the first channel measurement setting information to the second channel measurement information, or apply the second channel measurement information instead of the first channel measurement setting information. The terminal also reports the measured channel measurement results based on the period or transmission resource set by the second channel measurement setting information. If the second channel measurement setting information is not set, the terminal does not perform channel measurements.

[0138] 2> Otherwise (if the first channel measurement setting information is not set on the terminal),

[0139] 3> If the second channel measurement setting information is configured on the terminal, the channel measurement signal will be measured according to the second channel measurement setting information. The measured channel measurement results will then be reported according to the period or transmission resource set by the second channel measurement setting information. If the second channel measurement setting information is not configured, no channel measurement will be performed.

[0140] In one embodiment, the first condition in this disclosure is one of the following conditions. In this disclosure, when the first condition activates a cell, activates or restarts a cell group (or activates a cell group from an inactive state), or when an RRC deactivated mode terminal restarts a connection in an RRC connection restart procedure, an efficient condition is initiated that prevents the base station from unnecessarily transmitting a large amount of transmission resources or transmitting transmission resources frequently. For example, the first channel measurement setting information is applied and the channel measurement procedure or channel measurement reporting procedure is performed until one of the following conditions is satisfied.

[0141] -When a terminal successfully completes a random access procedure (a four-step random access procedure or a two-step random access procedure) in a cell (e.g., PCell, SCell, or PSCell) or a cell in a cell group (e.g., PSCell or SCell), when the random access procedure is successfully completed and the terminal is initially allocated an uplink transmission resource, or when the terminal is first instructed to provide an uplink transmission resource, the first condition is deemed to be satisfied.

[0142] --For example, more specifically, if a terminal performs a contention-free random access procedure (CFRA) (e.g., if it has been assigned a pre-specified preamble or terminal cell identifier (e.g., C-RNTI)),

[0143] ---When a terminal transmits a pre-specified preamble to a cell and receives a random access response (RAR) message, or receives a PDCCH instruction for a random access response, the random access procedure can be considered to have been successfully completed, and the first condition is deemed to be satisfied. Alternatively, when the terminal receives an uplink transmission resource for the first time after receiving a RAR, the first condition is deemed to be satisfied.

[0144] --If the terminal performs contention-based random access (CBRA) procedures (e.g., if it has not been assigned a pre-specified preamble or terminal cell identifier (e.g., C-RNTI))

[0145] ---When a terminal transmits a preamble (e.g., any preamble) to a cell, receives a random access response (RAR) message, uses the uplink transmission resources allocated, included, or indicated in the RAR message to transmit message 3 (e.g., a handover completion message), and receives a MAC CE (contention resolution MAC CE) from the target base station in message 4 indicating that the competition has been resolved, or receives uplink transmission resources in the PDCCH corresponding to the terminal's C-RNTI, the terminal can consider the random access procedure to the target base station to have been successfully completed, and therefore the terminal determines that the first condition is satisfied. Alternatively, when the size of the uplink transmission resources allocated in the RAR message is sufficient, and message 3 is transmitted, and the terminal transmits additional uplink data, the terminal determines that it has received link transmission resources for the first time, and therefore determines that the first condition is satisfied. In other words, when a RAR is received, the terminal determines that it has received uplink transmission resources for the first time, and therefore determines that the first condition is satisfied.

[0146] 1> If the device is set up or instructed to perform a two-step random access procedure,

[0147] 1> Or, if a two-step random access procedure is not set or instructed in the message, but the terminal supports the two-step random access procedure in its terminal capabilities, and the cell's system information supports the two-step random access procedure, and the system information broadcasts information for the two-step random access procedure (e.g., random access resources or critical values ​​for deciding whether or not to perform two-step random access), or if the terminal receives the system information and the signal strength is better or greater than the critical value broadcast in the system information, and the terminal performs the two-step random access procedure for the cell,

[0148] 2>When the two-step random access procedure is successfully completed, the terminal determines that the first condition has been met.

[0149] Specifically, the two-stage random access procedure is carried out by either the CBRA (contention-based random access) method or the CFRA (contention-free random access) method.

[0150] 3> If the terminal performs a CBRA-based two-step random access procedure,

[0151] 4> The terminal transmits a preamble using a transmission resource for two-stage random access (e.g., PRACH occasion, a transmission resource set by the base station via an RRC message, or a transmission resource broadcast in system information), and transmits data (e.g., MsgA MAC PDU) using a transmission resource for data transmission (e.g., PUSCH occasion). The data includes MAC control information (C-RNTI MAC CE) containing the terminal identifier (C-RNTI) or an RRC message (RRCReconfigurationComplete message or handover completion message).

[0152] 4> The terminal monitors the PDCCH, which is scrambled by a terminal identifier (C-RNTI) or a first identifier (MsgB-RNTI) derived from the time or frequency at which the preamble was transmitted.

[0153] 4> If a terminal receives a PDCCH scrambled by a terminal identifier, allocates a downlink transmission resource using the PDCCH, or receives MAC control information (timing advance command dMAC CE) for time timing adjustment in a downlink transmission resource,

[0154] 5> The terminal determines that it has successfully completed the two-step random access procedure and therefore satisfies the first condition.

[0155] 4> If the terminal receives a PDCCH scrambled by the first identifier (MsgB-RNTI), allocates a downlink transmission resource with the PDCCH, or receives a fallback random access response (RAR) for the preamble transmitted by the terminal on the downlink transmission resource (i.e., a fallback RAR instructing the base station to transmit MsgA to another transmission resource if the base station received the preamble but was unable to receive MsgA),

[0156] 5> The terminal transmits the data (MsgA MAC PDU) using the transmission resource specified in the random access response for fallback.

[0157] 5> The terminal monitors the PDCCH, which has been scrambled by the terminal identifier (C-RNTI).

[0158] 5> If a terminal receives a PDCCH scrambled by its terminal identifier, or allocates an uplink transmission resource with the PDCCH, the terminal determines that it has successfully completed the two-step random access procedure and that it has satisfied the first condition.

[0159] 3> If the terminal performs a CFRA-based two-step random access procedure,

[0160] 4> The terminal transmits a preamble in a transmission resource for two-stage random access (e.g., PRACH occasion, or a transmission resource designated by the base station as an RRC message), and transmits data (e.g., MsgA MAC PDU) in a transmission resource for data transmission (e.g., PUSCH occasion). The data includes MAC control information (C-RNTI MAC CE) containing the terminal identifier (C-RNTI) or an RRC message (RRCReconfigurationComplete message or handover completion message).

[0161] 4> The terminal monitors the PDCCH, which is scrambled by a terminal identifier (C-RNTI) or a first identifier (MsgB-RNTI) derived from the time or frequency at which the preamble was transmitted.

[0162] 4> If a terminal receives a PDCCH scrambled by a terminal identifier, allocates a downlink transmission resource using the PDCCH, or receives MAC control information for time timing adjustment (timing advance command MAC CE) in the downlink transmission resource,

[0163] 5> The terminal determines that it has successfully completed the two-step random access procedure and therefore satisfies the first condition.

[0164] 4> If the terminal receives a PDCCH scrambled by the first identifier (MsgB-RNTI), allocates a downlink transmission resource with the PDCCH, or receives a fallback random access response (RAR) in the downlink transmission resource for the preamble transmitted by the terminal (i.e., a fallback RAR instructing the base station to transmit the MsgA to another transmission resource if the base station received the preamble but was unable to receive the MsgA),

[0165] 5> The terminal determines that it has successfully completed the two-step random access procedure and therefore satisfies the first condition.

[0166] 5> The terminal transmits the data (MsgA MAC PDU) using the transmission resource specified in the random access response for fallback.

[0167] 1> When initiating a random access procedure or transmitting a preamble for a random access procedure, it is determined that the first condition has been met.

[0168] 1> Alternatively, if a two-step random access procedure is set or instructed to the terminal in a message, the terminal will determine that the first condition is satisfied. For example, before initiating the two-step random access procedure, the terminal will determine that the first condition is satisfied.

[0169] 1> Alternatively, if the terminal is instructed in a message to set or perform a two-step random access procedure, and the transmission resource (PUSCH) set for data transmission in the two-step random access procedure is greater than the first critical value, or if the RRC message includes a timing advance value, the terminal determines that it has satisfied the first condition. The first critical value is set by the base station via an RRC message (e.g., RRCReconfiguration), broadcast in system information, or by the size of the data the terminal has to transmit. For example, before starting a two-step random access procedure, the terminal determines that it has satisfied the first condition. Alternatively, if the RRC message includes a timing advance value, or if a two-step random access procedure is set, the terminal does not transmit a preamble and immediately transmits data on the set transmission resource (e.g., a transmission resource set by an RRC message, or a transmission resource indicated by the PDCCH of the target base station, monitored by the terminal). Therefore, before initiating a two-stage random access procedure, when transmitting data, or before transmitting data, the terminal determines that the first condition is satisfied. Alternatively, if the RRC message includes a timing advance value for time timing adjustment, or if a two-stage random access procedure is set, the terminal does not transmit a preamble and immediately transmits data on the configured transmission resource (PUSCH) (e.g., a transmission resource configured by the RRC message, or a transmission resource indicated by the PDCCH of the target base station, monitored by the terminal).If the configured transmission resource (PUSCH) (e.g., a transmission resource configured by an RRC message, or a transmission resource indicated by the PDCCH of the target base station monitored by the terminal) is greater than the first critical value, or if the RRC message includes a timing advance value for time timing adjustment, the terminal determines that the first condition is satisfied before initiating the two-stage random access procedure, when transmitting data, or before transmitting data.

[0170] 1> If an RRC inactive mode terminal transmits an RRCResumeRequest message and then receives an RRCResume message (or RRCSetup message) in response, the first condition can be considered satisfied.

[0171] 1>When the terminal performs a channel measurement based on the first channel measurement setting information set by the RRC message, if the timer indicating the period for channel measurement expires,

[0172] 1>When the terminal performs channel measurement based on the first channel measurement setting information set by the RRC message, if the time interval indicating the period for channel measurement has passed (or expired), or if any of the time intervals have been used (or applied),

[0173] 1>When the terminal performs channel measurement based on the first channel measurement setting information set by the RRC message, if the signal for channel measurement has been measured (or completed) the set number of times, or if the signal has been received the set number of times,

[0174] 1>When the terminal performs channel measurement based on the first channel measurement configuration information set by the RRC message, if the channel measurement is completed (when the channel measurement is completed) or if the channel measurement report is completed (or when the channel measurement report is completed),

[0175] If the first condition is met, a higher level (e.g., RRC level) will indicate a lower level (e.g., PDCP level, RLC level, MAC level, or PHY level) using an indicator, or a lower level (e.g., PDCP level, RLC level, MAC level, or PHY level) will indicate a higher level (e.g., RRC level).

[0176] A method for setting or applying first channel measurement setting information according to one embodiment of the present disclosure is extended to be set and used when activating or restarting a cell group (e.g., PSCell), activating an SCell, restarting an RRC connection in RRC deactivation mode (e.g., using the RRCResume message), or performing a handover procedure (e.g., using the RRCReconfiguration message).

[0177] In this disclosure, the term "BWP" is used without distinction between uplink and downlink, and its meaning, depending on the context, refers to the uplink BWP and the downlink BWP, respectively.

[0178] In this disclosure, the terms "uplink" and "downlink" are used interchangeably and their meanings will be determined by the context.

[0179] In this disclosure, a cell refers to a PCell, an SCell (e.g., an SCell configured in a master cell group (MCG)), a PSCell (e.g., a PCell in a secondary cell group (SCG)), or an SCell (e.g., an SCell configured in a secondary cell group (SCG)). In this disclosure, a dormant BWP is set or introduced for the SCell or PSCell of a terminal performing carrier integration technology or duplex technology, and the PDCCH is not monitored in the dormant BWP, thereby reducing terminal battery consumption. In addition, in this disclosure, channel measurements are performed and reported (e.g., measurement or reporting of CSI (channel state information) or CQI (channel quality information)), or beam measurements, beam tracking, or beam operation are performed in the dormant BWP, and when data transmission is required, switching or activation is performed in the normal BWP to allow data transmission to start in the normal BWP sooner. The dormant bandwidth is set or not applied to SpCells (PCells in MCG, or PCells in SCG (or PSCells)) that must continuously monitor signals, transmit or receive feedback, or maintain synchronization, or SCells with PUCCH configured.

[0180] If a terminal is instructed via a PCell to switch or activate a dormant portion of the bandwidth of a master cell group's SCell, the terminal will perform a channel measurement procedure for the dormant portion of the SCell's bandwidth and report the channel measurement results in the transmission resources of the master cell group's (MCG) PCell (e.g., via the PCell's PUCCH (physical uplink control channel) transmission resource) or the transmission resources of a SCell in which the master cell group's PUCCH is configured (e.g., via the PUCCH (physical uplink control channel) transmission resource). The RRC message specifies which cell or portion of bandwidth the channel measurement results per report in which cell's transmission resource (e.g., PUCCH or PUSCH).

[0181] If a terminal is instructed via a PSCell to switch or activate a secondary cell group's SCell in a dormant bandwidth, the terminal will perform a channel measurement procedure for the dormant bandwidth of the SCell and report the channel measurement results in the transmission resources of the secondary cell group (SCG)'s PSCell (e.g., via the PSCell's PUCCH (physical uplink control channel) transmission resource) or the transmission resources of the SCell in which the secondary cell group's PUCCH is configured (e.g., via the PUCCH (physical uplink control channel) transmission resource). The RRC message specifies which cell or which cell's bandwidth's channel measurement results are reported in which cell's transmission resource (e.g., PUCCH or PUSCH).

[0182] If a terminal is instructed via PCell to switch or activate a PSCell or SCell of a secondary cell group in a dormant portion of its bandwidth, or to suspend a secondary cell group (SCG or PSCell) (SCG suspension or cell group suspension), the terminal will report the channel measurement results obtained by performing a channel measurement procedure on a portion of the PSCell or SCell's bandwidth (the portion of the bandwidth set by the RRC message, or the last activated portion of the bandwidth) or the dormant portion of its bandwidth, using the transmission resources of the PCell of the master cell group (MCG) (e.g., via the PCell's PUCCH (physical uplink control channel) transmission resources), the transmission resources of the SCell on which the master cell group's PUCCH is set (e.g., via the PUCCH (physical uplink control channel) transmission resources), or the transmission resources of the PSCell of the secondary cell group (SCG) (e.g., via the PSCell's PUCCH (physical uplink control channel) transmission resources). In the RRC message, the terminal is configured on a cell-by-cell or bandwidth-by-bandwidth basis to determine which cell or partial bandwidth channel measurement results are reported for which cell and which transmission resource (e.g., PUCCH or PUSCH).

[0183] In this disclosure, several embodiments are proposed that operate on the DCI, MAC CE, or RRC message infrastructure of the PDCCH in order to manage dormant partial bandwidth or cell group deactivation status for terminal SCells (SCells of the master cell group when carrier integration technology is set, or SCells of the secondary cell group when duplex technology is set) or PSCells (PCells of the secondary cell group when duplex technology is set).

[0184] A network or base station configures a terminal with a Spcell (Pcell and PScell) and multiple Scells. When a terminal communicates with one base station, the Spcell refers to a Pcell; when a terminal communicates with two base stations (master and secondary base stations), it refers to the Pcell of the master base station or the PScell ​​of the secondary base station. A Pcell or Pscell, in the MAC layer, represents the primary cell used when a terminal and a base station communicate. It synchronizes timing, performs random access, transmits HARQ ACK / NACK feedback in PUCCH transmission resources, and exchanges most control signals. The technique by which a base station operates multiple Scells along with a Spcell to increase transmission resources and enhance data transmission resources for uplink or downlink links is called carrier integration technology or duplex technology.

[0185] In this disclosure, PCell means MCG (master cell group), and PSCell means SCG (secondary cell group). Furthermore, MCG includes PCell and SCell set in the MCG, and SCG includes PSCell and SCell set in the SCG. Also, cell refers to a cell group, or a cell group refers to a cell.

[0186] If a terminal is configured with a Spcell and multiple Scells via RRC messages, the state or mode of each cell (PCell, PSCell, or SCell), or for each Scell ​​or each SCell's partial bandwidth, or for each cell group, is set via RRC messages, MAC CE, or PDCCH's DCI. The state or mode of a cell is set to either active mode or activated state, or deactivated mode or deactivated state.

[0187] According to one embodiment, a cell being in an activated mode or state means that a terminal can exchange uplink or downlink data with a base station in a cell in an activated mode or state, in a portion of the cell that is not an activated portion of the bandwidth, an activated general portion of the bandwidth, or an activated portion of the bandwidth that is not an activated portion of the bandwidth, and can monitor the PDCCH to confirm the base station's instructions. Alternatively, a cell being in an activated mode or state means that a terminal can perform channel measurements on the downlink of a cell in an activated mode or state (or a portion of the cell that is not an activated portion of the bandwidth, an activated general portion of the bandwidth, or an activated portion of the bandwidth that is not an activated portion of the bandwidth), periodically report the measurement information to the base station, and periodically transmit a sounding reference signal (SRS) to the base station so that the base station can perform uplink channel measurements. Alternatively, for activated cells, the terminal activates or switches a partial bandwidth to a dormant partial bandwidth in accordance with instructions from the base station (e.g., PDCCH, MAC CE, or RRC message). If the terminal activates a dormant partial bandwidth in an activated cell, the terminal does not perform PDCCH monitoring in the cell, but instead performs a channel measurement report and reports the channel measurement results.

[0188] According to one embodiment, if the activated cell in the dormant bandwidth is a SCell, the terminal does not monitor PDCCH, does not receive downlink data, or performs channel measurement or reports measurement results. Alternatively, the terminal suspends a configured periodic transmission resource (e.g., configured uplink grant type 1), clears a configured periodic transmission resource (e.g., configured uplink grant type 2), or initializes it. Alternatively, the terminal does not transmit an SRS (sounding reference signal), does not transmit uplink data, or does not transmit a PUCCH (e.g., an SR (scheduling request), or a preamble for random access).

[0189] However, if a dormant bandwidth is activated, or if the cell that has been instructed to terminate the cell group is a PSCell, the terminal will either not monitor the PDCCH, perform PDCCH monitoring at very long intervals, or not receive downlink data. Alternatively, the terminal will perform channel measurement or report measurement results, or suspend a configured periodic transmission resource (e.g., configured uplink grant type 1), or clear or initialize a configured periodic transmission resource (e.g., configured uplink grant type 2). Alternatively, the terminal will transmit a sounding reference signal (SRS), or not transmit uplink data, or transmit a PUCCH (e.g., a scheduling request (SR), or a preamble for random access), or perform a random access procedure.

[0190] According to one embodiment, if a SCell is an activated cell that is not a dormant partial bandwidth, the terminal performs PDCCH monitoring, receives downlink data, or performs channel measurement or reports measurement results. Alternatively, the terminal resumes a configured periodic transmission resource (e.g., configured uplink grant type 1), or configures or activates a configured periodic transmission resource (e.g., configured uplink grant type 2). Alternatively, the terminal transmits an SRS (sounding reference signal), transmits uplink data, transmits a PUCCH (e.g., an SR (scheduling request) or a preamble for random access), or performs a random access procedure.

[0191] According to one embodiment, if a non-dormant partial bandwidth is activated, or if the cell to which Cell Group Resumption (SCG) has been instructed is a PSCell, the terminal performs PDCCH monitoring, receives downlink data, or performs channel measurement or reports measurement results. Alternatively, the terminal resumes a configured periodic transmission resource (e.g., configured uplink grant type 1), or configures or activates a configured periodic transmission resource (e.g., configured uplink grant type 2). Alternatively, the terminal transmits a sounding reference signal (SRS), transmits uplink data, transmits a PUCCH (e.g., a scheduling request (SR) or a preamble for random access), or performs a random access procedure.

[0192] However, when a cell is in deactivation mode, or in an inactive state, it means that the terminal cannot exchange data with the base station because the portion bandwidth configured for the cell is inactive, the configured portion bandwidth is not activated, or there is no activated portion bandwidth in the configured portion bandwidth. Alternatively, when a cell is in deactivation mode, or in an inactive state, it means that the terminal does not monitor the PDCCH to confirm instructions from the base station, does not perform channel measurements, does not report measurements, and does not transmit pilot signals.

[0193] Therefore, in order to activate a cell in deactivated mode, the base station must first set frequency measurement configuration information on the terminal using an RRC message, and the terminal then performs a cell or frequency measurement based on this configuration information. After receiving the terminal's cell or frequency measurement report, the base station activates the deactivated cell based on the frequency / channel measurement information. This results in a significant delay before the base station can activate carrier integration technology or duplex technology on the terminal and begin transmitting or receiving data.

[0194] In this disclosure, a dormant BWP or dormant state is proposed for a portion of the bandwidth of each activated cell (e.g., activated Scell ​​or activated PSCell) to conserve the terminal's battery and enable faster data transmission or reception. It is proposed to set or introduce a dormant BWP (bandwidth part) for each activated cell. Alternatively, in this disclosure, when dual connectivity technology is configured in the terminal, it is proposed to set or introduce the state of each cell group as activated, dormant, suspended, deactivated, or resumed. A method for executing cell group suspension (SCG suspension or cell group suspension) or cell group resumption (SCG resumption or Cell group resumption) instructions that direct cell group state transitions, and the resulting terminal operation are proposed.

[0195] In a dormant BWP (dormant BWP inactivated SCell), which is the dormant mode of an activated cell, or when a dormant BWP is activated, the terminal cannot exchange data with the base station, nor does it monitor the PDCCH to confirm base station instructions, nor does it transmit pilot signals. Instead, it performs channel measurements and reports the measured frequency / cell / channel results periodically or when events occur, depending on the base station settings. Consequently, in a dormant BWP of an activated cell, the terminal does not monitor the PDCCH or transmit pilot signals, resulting in battery savings compared to a normal BWP of an activated cell (or a non-dormant BWP), or compared to when a normal BWP of an activated cell (or a non-dormant BWP) is activated. Furthermore, unlike when a cell is deactivated, in order to perform channel measurement reporting, the base station can quickly activate the general bandwidth of an activated cell based on the measurement report, or based on the measurement report of the dormant bandwidth of an activated cell, thereby enabling the use of carrier integration technology earlier and reducing transmission delay.

[0196] Accordingly, in this disclosure, the state of a cell being in activation mode or activation means that the terminal can exchange uplink or downlink data with the base station in an activated or activated cell in an activated partial bandwidth, an activated general partial bandwidth, or an activated partial bandwidth that is not an activated dormant partial bandwidth of the cell, monitor the PDCCH to confirm the base station's instructions, perform channel measurements on the downlink of the activated or activated cell (or an activated partial bandwidth, an activated general partial bandwidth, or an activated partial bandwidth that is not an activated dormant partial bandwidth of the cell), periodically report the measurement information to the base station, and periodically transmit a sounding reference signal (SRS) to the base station so that the base station can perform uplink channel measurements. Furthermore, in this disclosure, the state that a cell is in activation mode or activated state means that, in an activated or activated cell, the terminal may not be able to exchange data with the base station on an uplink or downlink in the activated dormant portion of the cell's bandwidth, nor may it monitor the PDCCH to confirm instructions from the base station, but may perform channel measurements on the downlink of the activated dormant portion of the activated cell's bandwidth in activation mode or activated state and periodically report the measurement information to the base station.

[0197] According to one embodiment, if a dormant partial bandwidth is activated or if the cell to which cell group deactivation has been instructed is a PSCell, the terminal either does not monitor the PDCCH, performs PDCCH monitoring at very long intervals, or does not receive downlink data. Alternatively, the terminal performs channel measurement or reports measurement results, suspends a configured periodic transmission resource (e.g., configured uplink grant type 1), clears or initializes a configured periodic transmission resource (e.g., configured uplink grant type 2). Alternatively, the terminal transmits a sounding reference signal (SRS), does not transmit uplink data, transmits a PUCCH (e.g., a scheduling request (SR) or a preamble for random access), or performs a random access procedure.

[0198] According to one embodiment, if a cell that has been instructed to deactivate (or terminate) the cell group is a PSCell (or SCG), the terminal either does not monitor the PDCCH, performs PDCCH monitoring at very long intervals, or does not receive downlink data. Alternatively, the terminal performs channel measurement or reports measurement results, suspends a configured periodic transmission resource (e.g., configured uplink grant type 1), clears or initializes a configured periodic transmission resource (e.g., configured uplink grant type 2). Alternatively, the terminal transmits a sounding reference signal (SRS), does not transmit uplink data, transmits a PUCCH (e.g., a scheduling request (SR) or a preamble for random access), or performs a random access procedure. However, when cell group deactivation (or termination) is instructed, the RRC message instructing cell group deactivation (or termination) may trigger a radio resource management procedure based on the frequency measurement setting information configured by the base station. Alternatively, if RLM (radio link monitoring) setting information is configured, the timer (T310) will be driven if an instruction indicating signal missyncing is received from the RLM procedure (lower layer (PHY layer)), and when the timer (T310) expires, a radio link failure is declared. If an instruction indicating signal synchronization is received, the currently running timer (T310) will be terminated. Furthermore, when cell group deactivation (or termination) is instructed, if beam-related setting information is configured to trigger a beam failure detection procedure in the RRC message instructing cell group deactivation (or termination), the terminal will perform the beam failure detection procedure.

[0199] In one embodiment, in this disclosure, dormant partial bandwidth refers to the state of a partial bandwidth, or is used as the name of a logical concept that designates a particular partial bandwidth. Thus, a dormant partial bandwidth is activated, deactivated, or switched. For example, an instruction to switch an activated partial bandwidth in a cell to a dormant partial bandwidth, an instruction to put a cell into dormancy or transition to dormancy mode, or an instruction to activate the dormant partial bandwidth of a cell are interpreted as having the same meaning.

[0200] In one embodiment, in this disclosure, the general partial bandwidth refers to the partial bandwidth set for each cell of the terminal, excluding the dormant partial bandwidth, as indicated by an RRC message. In the general partial bandwidth, the terminal can exchange data with the base station for the uplink or downlink, monitor the PDCCH to confirm instructions from the base station, perform channel measurements for the downlink, periodically report the measurement information to the base station, and periodically transmit a sounding reference signal (SRS) to the base station so that the base station can perform uplink channel measurements. The general partial bandwidth also refers to the initial activation partial bandwidth, the basic partial bandwidth, or the first activation partial bandwidth or initial partial bandwidth to be activated from dormancy.

[0201] According to one embodiment, in the partial bandwidth set for each cell of the terminal, only one dormant partial bandwidth is set, and it is set for the downlink. Alternatively, in the partial bandwidth set for each cell of the terminal, one dormant partial bandwidth is set for either the uplink or the downlink.

[0202] According to one embodiment, in this disclosure, the state of a cell group is set to an activated state, a deactivated state, or a deactivated state. The state of a cell group is indicated by a bitmap or indicator of the DCI of the PDCCH, by MAC control information, or by an indicator in an RRC message. If the state of a cell group is indicated as activated, the RRC message (e.g., RRCReconfiguration message, RRCSetup message, or RRCResume message) saves the cell group configuration information set or indicated, and the terminal applies, restores, or restarts it. The terminal also monitors the PDCCH, receives downlink data, or performs channel measurement or measurement result reporting in the PCell, PSCell, or configured SCell of the cell group in response to the RRC message setting. Alternatively, the terminal may resume a configured periodic transmission resource (e.g., a configured uplink grant type 1), or configure or activate a configured periodic transmission resource (e.g., a configured uplink grant type 2). Alternatively, the terminal may transmit a sounding reference signal (SRS), transmit uplink data, transmit a PUCCH (e.g., a scheduling request (SR) or a preamble for random access), or perform a random access procedure.

[0203] According to one embodiment, if the state of a cell group is indicated as suspended or inactive, the terminal does not save or discard the configuration information of the cell group that has been set or indicated by an RRC message (e.g., RRCReconfiguration message, RRCSetup message, or RRCResume message), but it does not apply it. The terminal also monitors the PDCCH, receives downlink data, or performs channel measurement or reports measurement results in the PCell, PSCell, or configured SCell of the cell group, based on the RRC message setting. Alternatively, the terminal resumes a configured periodic transmission resource (e.g., configured uplink grant type 1), or sets or activates a configured periodic transmission resource (e.g., configured uplink grant type 2). Alternatively, the terminal may transmit an SRS (sounding reference signal), transmit upward link data, transmit a PUCCH (e.g., an SR (scheduling request) or a preamble for random access), or perform a random access procedure.

[0204] According to one embodiment, if the state of a cell group is instructed to be inactive, or if the cell group configuration information is to be canceled, the terminal cancels or discards the configuration information of the cell group that was set or instructed by an RRC message (e.g., RRCReconfiguration message, RRCSetup message, or RRCResume message).

[0205] Figure 1E illustrates a procedure for efficiently using a fairly wide frequency bandwidth to provide services to a terminal in a next-generation wireless communication system according to one embodiment of the present disclosure.

[0206] Figure 1E illustrates how next-generation wireless communication systems efficiently utilize a fairly wide frequency bandwidth to provide services to terminals with various and different capabilities (or categories) and conserve battery power.

[0207] A single cell provided by a base station, like 1e-05, serves a very wide frequency band. However, in order to serve terminals with different capabilities, the wide frequency band is divided into multiple subbands and managed within a single cell.

[0208] First, when a terminal is powered on, it searches the entire frequency band provided by the operator (PLMN) in a fixed resource block unit (e.g., 12 RB (resource block) units). That is, the terminal starts searching for PSS (primary synchronization sequence) / SSS (secondary synchronization sequence) in the entire system bandwidth within the resource block unit (1e-10). If it is searching for PSS / SSS (1e-01 or 1e-02) in the resource block unit and detects a signal, it reads and interprets (decodes) the signal to confirm the boundary between the subframe and the radio transmission resource frame. Therefore, subframes are distinguished in 1ms units, and the base station and the downlink signal are synchronized. An RB (resource block) is defined as a two-dimensional unit with a predetermined frequency resource and a predetermined time resource. For example, the time resource is defined as a 1ms unit, and the frequency resource is defined as 12 subcarriers (1 carrier x 15kHz = 180kHz). Once synchronization is complete, the terminal checks the MIB (master system information block) or MSI (minimum system information), checks the CORESEST (control resource set) information, and checks the initial access bandwidth part (initial access BWP) information (1e-15, 1e-20). CORESET information refers to the location of the time / frequency transmission resource from which the control signal is transmitted from the base station, for example, it indicates the resource location from which the PDCCH channel is transmitted. In other words, CORESET information indicates where the first system information (SIB1: system information block 1) is transmitted, and indicates at which frequency / time resource the PDCCH is transmitted. After reading the first system information, the terminal checks the information related to the initial bandwidth part (initial BWP).Once the terminal has completed synchronization of the downlink signal with the base station and received the control signal, it performs a random access procedure in the initial BWP (initial bandwidth) of the cell to which it camped on, requests RRC coupling configuration, receives an RRC message, and performs RRC coupling configuration.

[0209] In RRC connection configuration, multiple partial bandwidths are configured for each cell (Pcell, Pscell, Spcell, or Scell). Within a single cell, multiple partial bandwidths are configured for downlinks, and separately, multiple partial bandwidths are configured for uplinks.

[0210] Multiple subbandwidths are configured, instructed by a subbandwidth identifier (BWP identifier), to be used as the initial BWP, default BWP, first active BWP, dormant BWP, or first active BWP from dormant.

[0211] The initial bandwidth (initial BWP) is used in a cell-specific bandwidth, with one instance for each cell. It is used in the bandwidth where a terminal connecting to a cell for the first time can establish a connection to the cell via random access procedures, or where a terminal that has established a connection can perform synchronization. The base station also sets the initial downlink bandwidth (initial downlink BWP) for downlinks and the initial uplink bandwidth (initial uplink BWP) for uplinks, separately for each cell. The setting information related to the initial bandwidth is broadcast in the system information 1 (SIB1) instructed by CORESET, and the base station further sets it in an RRC message to the terminal that has established a connection. The initial bandwidth is used by specifying bandwidth identifier 0 for both uplinks and downlinks. That is, all terminals connected to the same cell use the same initial bandwidth, specifying it identically as bandwidth identifier 0. This is because, when performing random access procedures, it has the advantage of facilitating competitive-based random access procedures by ensuring that base stations transmit random access response (RAR) messages in an initial partial bandwidth that can be read by all terminals.

[0212] The first active BWP (Bandwidth Point) is configured to be unique to each UE (Device Underground) and is specified as a bandwidth identifier for multiple bandwidths. The first active BWP is configured for both downlinks and uplinks, and is set as a bandwidth identifier for the first active downlink BWP and the first active uplink BWP, respectively. The first active BWP is used to indicate which bandwidth to activate and use first when multiple bandwidths are configured for a single cell. For example, if a device is configured with a Pcell or Pscell and multiple Scells, and each Pcell, Pscell, or Scell ​​has multiple bandwidths configured, then if the Pcell, Pscell, or Scell ​​is activated, the device will activate and use the first active BWP among the multiple bandwidths configured for the Pcell, Pscell, or Scell. In other words, for downlinks, the first active downlink bandwidth (BWP) is activated and used, and for uplinks, the first active uplink bandwidth (BWP) is activated and used.

[0213] The operation of a terminal switching the current or activated downlink partial bandwidth for a cell and activating the first activated downlink partial bandwidth (or a partial bandwidth set or instructed by an RRC message), or switching the current or activated uplink partial bandwidth and activating the first activated uplink partial bandwidth (or a partial bandwidth set or instructed by an RRC message), is performed when a cell or partial bandwidth is inactive and receives an instruction to activate it via an RRC message, MAC control information, or DCI. It is also performed when a cell or partial bandwidth receives an instruction to transition to a dormant state, or an instruction to activate a dormant partial bandwidth, via an RRC message, MAC control information, or DCI. This is because, when activating a cell or partial bandwidth, it switches the currently or activated downlink partial bandwidth to activate the first activated downlink partial bandwidth (or the partial bandwidth set or indicated by the RRC message), or switches the uplink partial bandwidth to activate the first activated uplink partial bandwidth (or the partial bandwidth set or indicated by the RRC message). Therefore, even when reporting channel measurements in a dormant state, the base station must measure and report the frequency / channel for the first activated downlink / uplink partial bandwidth in order to effectively utilize carrier integration technology. The default BWP is set to be different for each UE (device-specific) and is specified and indicated as a partial bandwidth identifier in multiple partial bandwidths. The default BWP is set only for downlinks. The default BWP is used as the fallback partial bandwidth for activated partial bandwidths in multiple downlink partial bandwidths after a certain period of time.For example, a partial bandwidth inactivity timer (BWP inactivity timer) is set per cell or per partial bandwidth via RRC messages. The timer is started or restarted when data transmission or reception occurs in an activated partial bandwidth that is not the basic partial bandwidth, or when an activated partial bandwidth is switched to another partial bandwidth. When the timer expires, the terminal in the cell falls back or switches the activated downlink partial bandwidth to the basic bandwidth. Switching means the procedure of deactivating the currently activated partial bandwidth and activating the partial bandwidth to which the switching is instructed. Switching is triggered by RRC messages, MAC control elements, or L1 signaling (downlink control information (DCI) of the PDCCH). Switching is triggered by instructing the partial bandwidth to be switched or activated, and the partial bandwidth is indicated by a partial bandwidth identifier (e.g., 0, 1, 2, 3, or 4).

[0214] The reason for applying and using the basic partial bandwidth only for downlinks is that it simplifies base station scheduling by allowing the base station to instruct terminals to fall back to the basic partial bandwidth after a certain period of time, cell by cell, and to receive instructions from the base station (e.g., DCI in PDCCH). For example, if a base station sets the basic partial bandwidth of a terminal connected to a single cell as the initial partial bandwidth, the base station will continue to issue scheduling instructions only using the initial partial bandwidth after a certain period of time. If the basic partial bandwidth is not set by an RRC message, the initial partial bandwidth is considered the basic partial bandwidth, and when the partial bandwidth deactivation timer expires, the basic partial bandwidth falls back to the initial partial bandwidth.

[0215] Alternatively, to increase the flexibility of base station implementation, a basic partial bandwidth can be defined and set for the uplink as well, and used in the same way as the basic partial bandwidth for the downlink.

[0216] Dormant BWP refers to a dormant BWP inactivated SCell, which is a dormant mode of an activated cell. When a dormant BWP is activated, the terminal cannot exchange data with the base station, does not monitor the PDCCH to confirm base station instructions, or transmit pilot signals, but performs channel measurements and reports the measured frequency / cell / channel results periodically or when an event occurs, according to the base station settings. Therefore, because the terminal does not monitor the PDCCH and does not transmit pilot signals in the dormant BWP of the activated cell, it can conserve battery power compared to the general BWP of the activated cell (or the non-dormant BWP), or compared to when the general BWP of the activated cell (or the non-dormant BWP) is activated, and unlike when the cell is deactivated, it can perform channel measurement reporting. Based on the measurement report, or based on the measurement report of the dormant BWP of the activated cell, the base station can activate the general BWP of the activated cell earlier and use carrier integration technology earlier, thereby reducing transmission delay.

[0217] The first activated partial bandwidth (or the first activated non-dormant partial bandwidth or partial bandwidth set or indicated by an RRC message) that is switched from a dormant state or dormant partial bandwidth to an activated partial bandwidth is when a terminal is operating an activated partial bandwidth in a dormant partial bandwidth, when an activated partial bandwidth in an activated cell is a dormant partial bandwidth, or when a cell switches to a dormant partial bandwidth, the terminal receives a DCIMAC of the PDCCH from the base station. If a CE or RRC message instructs the terminal to switch an activated cell's partial bandwidth to a general partial bandwidth (or a partial bandwidth that is not a dormant partial bandwidth) in a dormant partial bandwidth, or if a dormant partial bandwidth is instructed to switch or convert an activated partial bandwidth to a general partial bandwidth, or if a dormant partial bandwidth is instructed to switch or convert an activated partial bandwidth to a general partial bandwidth (e.g., the first activated partial bandwidth to be activated from dormancy), then the terminal is instructed by such instruction to switch and activate the current or activated partial bandwidth of the activated cell, or to activate the partial bandwidth that must be activated from the dormant state set by the RRC message.

[0218] Figure 1F shows the procedure for switching a terminal from RRC idle mode to RRC connected mode in a next-generation wireless communication system according to one embodiment of the present disclosure, and illustrates the procedure for setting bearer setting information, cell group setting information or cell setting information or channel measurement setting information for connection in the terminal.

[0219] A single cell provided by a base station serves a fairly wide frequency band. First, the terminal searches the entire frequency band provided by the operator (PLMN) in a fixed resource block unit (e.g., 12RB (resource block) unit). That is, the terminal starts searching for PSS (primary synchronization sequence) / SSS (secondary synchronization sequence) in the resource block unit and in the overall system bandwidth. If the terminal finds a signal while searching for PSS / SSS in the resource block unit, it reads and interprets (decodes) the signal and confirms the boundary between the subframe and the radio transmission resource frame. Once the terminal has completed synchronization, it reads the system information of the cell it is currently camp-on. That is, it checks the MIB (master system information block) or MSI (minimum system information), checks the CORESEST (control resource set) information, reads the system information, and checks the initial BWP (bandwidth part) information (1f-01, 1f-05). CORESET information refers to the location of the transmission resource where control signals are transmitted from the base station at a given time / frequency. For example, it indicates the location of the resource where the PDCCH channel is transmitted.

[0220] Once the terminal has completed synchronization of the downlink signal with the base station and is receiving the control signal, the terminal performs a random access procedure in the initial partial bandwidth, receives a random access response, requests RRC coupling configuration, receives an RRC message, and configures the RRC coupling (1f-10, 1f-15, 1f-20, 1f-25, 1f-30).

[0221] Once the basic RRC connection configuration is complete, the base station transmits an RRC message to the terminal inquiring about its UE capability (UE Capability Enquiry) (1f-35) to confirm the terminal's UE capability. Alternatively, the base station may inquire about the terminal's capability from the MME or AMF, because if the terminal is already connected to the base station, the MME or AMF has stored the terminal's capability information. If the terminal capability information desired by the base station is not stored, the base station requests the terminal's capability. When the terminal reports its capability, it reports to the base station, as part of its capability, whether the terminal supports dormant partial bandwidth for each cell group (master cell group or secondary cell group) SCell, whether it supports the first, second, third, or fourth embodiment of this disclosure, whether it supports dormant partial bandwidth for each cell group PSCell, whether it supports cell group suspension or reactivation procedures for each cell group PSCell, or the number of cell groups it supports. Furthermore, during the RRC connection reactivation procedure, the terminal reports to the base station via the RRCResume message whether the configuration information of the master cell group's SCell, the secondary cell group's SCell, or the secondary cell group's PSCell can be saved and restored, discarded, partially reconfigured, or activated.

[0222] The reason a base station transmits an RRC message to a terminal to confirm the terminal's performance is to verify the terminal's capabilities, for example, how much frequency bandwidth the terminal can read, or to understand the range of frequency bandwidth that can be read. After confirming the terminal's performance, the base station sets an appropriate partial bandwidth (BWP) for the terminal. If a terminal receives an RRC message inquiring about its performance, it can respond by indicating the range of bandwidth it will support, or how much of the current system bandwidth it will support, either by an offset from the reference center frequency, by directly indicating the start and end points of the supported frequency bandwidth, or by specifying the center frequency and bandwidth (1f-40).

[0223] Partial bandwidth is set by the RRCSetup message, RRCResume message (1f-25), or RRCReconfiguration message (1f-45, 1f-70) in the RRC connection setting. RRC messages contain configuration information relating to PCell, Pscell, or multiple cells, and multiple partial bandwidths are set for each cell (PCell, Pscell, or Scell). When setting multiple partial bandwidths for each cell, multiple partial bandwidths are set for use in the downward link of each cell. In the case of an FDD system, multiple partial bandwidths are set for use in common in the downward and upward links of each cell, distinct from the downward link partial bandwidth. In the case of a TDD system, multiple partial bandwidths are set for common use in the downward and upward links of each cell.

[0224] The cell configuration information for each cell (PCell, Pscell, or Scell), or the information for partial bandwidth configuration, includes some of the following information:

[0225] - Cell identifier (SCellindex)

[0226] - Cell setting information

[0227] --First channel measurement settings information by cell or by partial bandwidth

[0228] -- Second channel measurement settings information by cell or by partial bandwidth

[0229] - Cell downward link partial bandwidth setting information

[0230] --Initial downlink BWP (Bandwidth) setting information

[0231] -- Multiple partial bandwidth configuration information, and a partial bandwidth identifier (BWPID) corresponding to each partial bandwidth.

[0232] --Initial state setting information for cell or downlink partial bandwidth (e.g., active, dormant, or inactive state)

[0233] -- A partial bandwidth identifier indicating the first active downlink BWP.

[0234] -- A partial bandwidth identifier that indicates the default BWP (Bandwidth).

[0235] --Configuration information for PDCCH monitoring related to each bandwidth segment. For example, CORESET information, search space resource information, or PDCCH transmission resource, period, and subframe number information.

[0236] -- Partial bandwidth identifier indicating dormant partial bandwidth

[0237] -- A partial bandwidth identifier that indicates the first activation partial bandwidth to activate from dormancy.

[0238] -- Partial bandwidth deactivation timer settings and their timer values

[0239] --First channel measurement settings information by cell or by partial bandwidth

[0240] -- Second channel measurement settings information by cell or by partial bandwidth

[0241] - Cell upward link portion bandwidth setting information

[0242] --Initial uplink BWP (Bandwidth) configuration information

[0243] -- Multiple partial bandwidth configuration information, and a partial bandwidth identifier (BWP ID) corresponding to each partial bandwidth.

[0244] --Initial state setting information for cell or downlink partial bandwidth (e.g., active, dormant, or inactive state)

[0245] -- A partial bandwidth identifier indicating the first active uplink BWP.

[0246] - Configuration information related to transmission resources that perform channel measurements in dormant or non-dormant bandwidth areas and report the measurement results (e.g., PUCCH transmission resource information for PCell, PUCCH SCell, or PSCell)

[0247] According to one embodiment, in order to quickly activate a cell group (or cell) or to enable a terminal to quickly perform channel measurements in a cell, the base station temporarily transmits many or good measurement signals, and the first channel measurement setting information includes, in the setting information of a cell in a cell group (e.g., PCell, PSCell, or SCell), frequent channel measurement signals (e.g., radio resource, or TRS (temporary reference signal), SSB (synchronization signal block), CSI-RS (channel state information reference signal), or RS (reference) The first channel measurement setting information includes setting information such as the period related to the signal, information on the transmission resource to be transmitted (frequency or time transmission resource to which the frequent channel measurement signal is transmitted), the interval or number of times (number of times the frequent channel measurement signal is transmitted), timer value (time to which the frequent channel measurement signal is transmitted), or time interval (the interval to which the frequent channel measurement signal is transmitted (e.g., offset of time unit (slot, subframe or symbol, etc.))). The first channel measurement setting information also includes setting information such as the transmission resource to which the terminal must report the measured results, its period, interval, timing or offset.

[0248] The first channel measurement configuration information sets a short reporting cycle (or transmission resource) for when a terminal reports channel measurement results, or the base station configures transmission resources for channel measurement so that it can transmit many channel measurement signals (or transmission resources (e.g., radio resource or TRS (temporary reference signal))) more frequently or more often to support faster channel measurement or many signal measurements by the terminal. The first channel measurement configuration information includes configuration information relating to channel measurement signals for a specific terminal (or terminal) in a cell or partial bandwidth. For example, the first channel measurement configuration information may include the cycle of the channel measurement signal, the number of signals transmitted, the duration for which the signal is transmitted, the offset relating to the time of transmission, or the time length between transmitted signals. Alternatively, the first channel measurement configuration information may include a list relating to multiple channel measurement signals to be transmitted, a time transmission resource (or frequency transmission resource) indicating the position of the transmitted signals, a transmission resource (time transmission resource or frequency transmission resource) for reporting the measured results, or the cycle for reporting the measured results.

[0249] According to one embodiment, the first channel measurement setting information is set differently for each cell or partial bandwidth for each of the multiple cells or partial bandwidths set by the RRC message, and beam-related setting information (TCI (transmission configuration indication) state or QCL (quasi co-location)) such as beam direction, beam number or beam position is set together to help the terminal easily measure the transmission resources for measuring the channel.

[0250] According to one embodiment, the first channel measurement setting information enables the terminal to correctly perform channel measurement or channel measurement reporting by setting a TA (timing advance) value (or offset value) for synchronizing the base station's downlink signal or the base station's uplink signal, a timer (TAT: time alignment timer) indicating the validity of the TA value, or a timer value (TAT value). The first channel measurement setting information set by an RRC message also includes multiple channel measurement signal information. By specifying one of the multiple channel measurement signal information or beam setting information set by an RRC message, MAC CE, or DCI, the terminal applies or uses the specified channel measurement signal information or beam setting information to perform channel measurement or report channel measurement. The instruction method defines a mapping between a bitmap, index, identifier and each set channel measurement signal information, and provides instructions based on this.

[0251] In another embodiment, channel measurement signal information is set or instructed via an RRC message or MAC CE, causing the terminal to apply or utilize the set (or instructed) channel measurement signal information to perform channel measurement or report channel measurement.

[0252] The first channel measurement setting information according to one embodiment of the present disclosure is initially deactivated when set by an RRC message or after a handover, and is subsequently activated by the MAC control information, PDCCH DCI information, or RRC message proposed in the present disclosure. When set by an RRC message, the initial state is deactivated so that the base station can easily manage the terminal's cell state or channel measurement procedure, and can accurately perform the timing of when and how the terminal performs channel measurement without processing delay issues for RRC messages.

[0253] Furthermore, RRC messages (RRCReconfiguration or RRCResume) include or set second channel measurement configuration information. This second channel measurement configuration information includes general channel measurement configuration information such as the transmission resources for the channel measurement signal, its period, time interval or number of times, or the transmission resources for channel measurement reporting, its period or time interval.

[0254] The initial BWP, default BWP, or first active BWP that is set is used for the following purposes and operates as follows to suit those purposes:

[0255] The initial bandwidth (initial BWP) is used as a cell-specific bandwidth, with one unique bandwidth for each cell. It is used by terminals connecting to a cell for the first time to establish a connection via random access procedures, or by terminals that have already established a connection to perform synchronization. The base station also sets the initial downlink bandwidth (initial downlink BWP) for downlinks and the initial uplink bandwidth (initial uplink BWP) for uplinks, separately for each cell. The setting information related to the initial bandwidth is broadcast in the system information 1 (SIB1) instructed by CORESET, and the base station further sets it to the connected terminal via RRC message. The initial bandwidth is used by specifying it as bandwidth identifier 0 for both uplinks and downlinks. That is, all terminals connected to the same cell use the same initial bandwidth, specifying it as bandwidth identifier 0. This is because, when performing random access procedures, the base station transmits the random access response (RAR) message in an initial portion of the bandwidth that can be read by all terminals, thus facilitating competitive random access procedures.

[0256] The first active bandwidth (BWP) is configured to be unique to each UE (Device Underground) and is specified as a bandwidth identifier for multiple bandwidths. The first active bandwidth is configured for both downlinks and uplinks, with the first active downlink BWP and the first active uplink BWP being configured as bandwidth identifiers, respectively. The first active bandwidth is used to indicate which bandwidth to activate and use first when multiple bandwidths are configured for a single cell. For example, if a UE is configured with a Pcell or Pscell and multiple Scells, and each Pcell, Pscell, or Scell ​​has multiple bandwidths configured, then if the Pcell, Pscell, or Scell ​​is activated, the UE will activate and use the first active bandwidth (BWP) among the multiple bandwidths configured for the Pcell, Pscell, or Scell. In other words, for downlinks, the first active downlink bandwidth (BWP) is activated and used, and for uplinks, the first active uplink bandwidth (BWP) is activated and used.

[0257] The operation of a terminal switching the current or activated downlink partial bandwidth for a cell to activate the first activated downlink partial bandwidth (or a partial bandwidth set or instructed by an RRC message), or switching the current or activated uplink partial bandwidth to activate the first activated uplink partial bandwidth (or a partial bandwidth set or instructed by an RRC message), is performed when a terminal receives an instruction to activate a partial bandwidth of a cell or activated cell that is inactive or dormant, or to switch from an inactive or dormant partial bandwidth to a general partial bandwidth, via an RRC message, MAC control information, or DCI of a PDCCH. Furthermore, when a terminal receives an instruction via an RRC message, MAC control information, or PDCCH DCI to transition an activated cell or partial bandwidth to a dormant state, or to switch to or activate a dormant partial bandwidth, the terminal switches the partial bandwidth to a dormant partial bandwidth, activates it, or puts the partial bandwidth into dormancy.

[0258] Dormancy, switching to a dormant partial bandwidth, or activation of a dormant partial bandwidth means, in this disclosure, performing the proposed operation in a dormant state. That is, the terminal performs the operation of measuring the channel for the downlink partial bandwidth (or dormant partial bandwidth) and reporting it to the base station without performing PDCCH monitoring. Or, when an activated cell or partial bandwidth is activated or switched to a general partial bandwidth, the dormant partial bandwidth is set to the first activated downlink, uplink partial bandwidth, or basic partial bandwidth in order to switch the downlink partial bandwidth, activate the first activated downlink partial bandwidth, switch the uplink partial bandwidth, and activate the first activated uplink partial bandwidth. The basic partial bandwidth (default BWP) is set to be different for each terminal (UE specific) and is indicated by specifying it as a partial bandwidth identifier in multiple partial bandwidths. The basic partial bandwidth is set for downlinks only. The basic partial bandwidth is used as the fallback partial bandwidth after a certain period of time, when the activated partial bandwidths in multiple downlink partial bandwidths are used.

[0259] For example, a partial bandwidth inactivity timer (BWP inactivity timer) can be set per cell or per partial bandwidth using an RRC message. The timer is started or restarted when data transmission or reception occurs in an activated partial bandwidth that is not the basic partial bandwidth, or when the activated partial bandwidth is switched to another partial bandwidth. When the timer expires, the terminal falls back to or switches the activated downlink partial bandwidth in the cell to the basic bandwidth. Switching means the procedure of deactivating the currently activated partial bandwidth and activating the partial bandwidth to which the switching is instructed. Switching can be triggered by an RRC message, MAC control element, or L1 signaling (DCI (downlink control information) of PDCCH). Switching is triggered by instructing the partial bandwidth to be switched or activated, and the partial bandwidth is indicated by a partial bandwidth identifier (e.g., 0, 1, 2, 3, or 4).

[0260] The reason for applying and using the basic partial bandwidth only for downlinks is that it facilitates base station scheduling by allowing terminals to fall back to the basic partial bandwidth after a certain period of time has elapsed on a cell-by-cell basis, and to receive instructions from the base station (e.g., DCI of PDCCH). For example, if a base station sets the basic partial bandwidth of a terminal connected to a single cell as the initial partial bandwidth, the base station will continue to issue scheduling instructions only using the initial partial bandwidth after a certain period of time. If the basic partial bandwidth is not set by an RRC message, the initial partial bandwidth is considered the basic partial bandwidth, and when the partial bandwidth deactivation timer expires, it will fall back to the initial partial bandwidth.

[0261] Alternatively, to increase the flexibility of base station implementation, a basic partial bandwidth can be defined and set for the uplink as well, and used in the same way as the basic partial bandwidth for the downlink.

[0262] Dormant BWP refers to a dormant BWP inactivated SCell, which is a dormant mode of an activated cell. Alternatively, when a dormant BWP is activated, the terminal may not be able to exchange data with the base station, nor may it monitor the PDCCH to confirm base station instructions, nor may it transmit pilot signals. Instead, it may perform channel measurements and report the measured frequency / cell / channel results periodically or when an event occurs, depending on the base station configuration. Therefore, because the terminal does not monitor the PDCCH and does not transmit pilot signals in the dormant BWP of the activated cell, it can conserve battery power compared to the general BWP of the activated cell (or the non-dormant BWP), or compared to when the general BWP of the activated cell (or the non-dormant BWP) is activated, and unlike when the cell is deactivated, it can perform channel measurement reporting. Based on the measurement report, or based on the measurement report of the dormant BWP of the activated cell, the base station can activate the general BWP of the activated cell earlier and use carrier integration technology earlier, thereby reducing transmission delay.

[0263] The first activated partial bandwidth (or the first activated non-dormant partial bandwidth) to be activated from dormancy is the partial bandwidth that the terminal must switch or activate in a dormant cell when the terminal is operating one activated cell's partial bandwidth as a dormant partial bandwidth, when the activated partial bandwidth in an activated cell is a dormant partial bandwidth, or when the cell switches to a dormant partial bandwidth, when the terminal is instructed by the base station via a PDCCH DCI, MAC CE, or RRC message to switch the activated cell's partial bandwidth from a dormant partial bandwidth to a general partial bandwidth (or a partial bandwidth that is not a dormant partial bandwidth), when the base station is instructed to switch or convert the activated partial bandwidth in a dormant partial bandwidth to a general partial bandwidth, or when the terminal is instructed to switch or convert the activated partial bandwidth in a dormant partial bandwidth to a general partial bandwidth (e.g., the first activated partial bandwidth to be activated from dormancy), and the partial bandwidth that the terminal must switch or activate in accordance with the above instructions is the first activated partial bandwidth to be activated from dormancy as set by the RRC message.

[0264] In this disclosure, the meaning of switching the first partial bandwidth to the second partial bandwidth is to be interpreted as either activating the second partial bandwidth, or deactivating the activated first partial bandwidth and activating the first partial bandwidth.

[0265] Furthermore, in the RRCSetup message or RRCResume message (1f-25) or RRCReconfiguration message (1f-45) for RRC connection configuration, a state transition timer is set so that the terminal can perform state transitions on its own, even if it does not receive RRC messages, MAC control information, or instructions via DCI of the PDCCH from the base station. For example, the terminal sets a cell deactivation timer (ScellDeactivationTimer) for each cell, and when the cell deactivation timer expires, the cell transitions to the deactivated state.

[0266] Furthermore, the RRCSetup message, RRCResume message (1f-25), or RRCReconfiguration message (1f-45) for RRC connection settings includes measurement configuration information and measurement gap information, as well as measurement object information. Additionally, the RRCSetup message, RRCResume message (1f-25), or RRCReconfiguration message (1f-45) for RRC connection settings configures a power saving mode to reduce terminal power consumption. Along with this power saving mode, it includes configuration information such as the DRX (discontinuous reception) cycle, offset, on-duration interval (the interval during which the terminal must monitor the PDCCH), or time information, as well as time information related to when the base station must monitor or detect the PDCCH before the on-duration interval in the DRX cycle, or short time cycle information. If a function to reduce terminal power consumption is configured, the terminal sets a DRX period and detects a WUS (wake-up signal) signal in the section before the on-duration section in which it is configured to monitor the base station's PDCCH. The base station then uses the DCI of the PDCCH in the WUS signal to instruct the terminal whether to skip (or not perform) PDCCH monitoring in the immediately following on-duration section, or to perform it. Compared to the terminal having to constantly monitor the PDCCH in the on-duration section, the base station uses the WUS signal to instruct the terminal not to monitor the PDCCH in the on-duration section, thereby saving battery power on the terminal.

[0267] Once the RRC connection is complete, the terminal configures multiple subbandwidths according to the instructions set by the RRC message. To conserve battery power, one or a few of the configured subbandwidths are activated. For example, one subbandwidth to be activated is specified. The base station then uses RRC messages, MAC control information (MAC CE), or L1 signaling (PHY hierarchical control signals such as DCI in the PDCCH) to instruct the activation of the subbandwidth and to switch from the initial connected subbandwidth to the new subbandwidth. Alternatively, the base station defines new bitmap information using DCI in the PDCCH to instruct whether to activate a general subbandwidth (or a subbandwidth that is not a dormant subbandwidth), activate a dormant subbandwidth, or deactivate a subbandwidth. Or, the base station uses a bitmap to instruct whether to activate a general subbandwidth (e.g., the first activated subbandwidth to be activated from dormancy), activate a dormant subbandwidth, switch to a dormant subbandwidth, or perform subbandwidth switching. In terms of scheduling, it remains advantageous to allocate a new bandwidth to the initial connection bandwidth and manage connected users separately, as there are many other newly connecting users. This is because the initial connection bandwidth is not configured on a per-terminal basis but is shared and used commonly by all terminals. Furthermore, to reduce signaling overhead, the default bandwidth is dynamically indicated by MAC control information, L1 signaling, or system information.

[0268] RRC messages (RRCSetup messages or RRCResume messages (1f-25), or RRCReconfiguration messages (1f-70)) contain configuration information for cell groups. The configuration information for cell groups includes some or more of the following information, or instructs the status or procedure related to each cell group, or the application or de-application of configuration information.

[0269] - A cell group identifier that indicates a cell group (e.g., cell group identifier or its index)

[0270] - Indicators that indicate the state of a cell group (e.g., activated state, suspended state, or deactivated state)

[0271] - Indicators that indicate the state of a cell group (e.g., an indicator to suspend (or deactivate) a cell group (e.g., Cellgroup(SCG) suspension indicator), or an indicator to resume (or activate) a cell group (e.g., Cellgroup(SCG) resumption indicator)).

[0272] - Indicators that indicate the state of a cell group trigger procedures in the corresponding protocol layer (e.g., SDAP layer, PDCP layer, RLC layer, or MAC layer) (e.g., PDCP re-establishment indicator, PDCP data recovery indicator, indicator to trigger a new procedure, RLC re-establishment indicator, MAC layer initialization indicator, or MAC layer partial initialization indicator)

[0273] - If an indicator is included to abort (or deactivate) the state of the cell group, the PSCell of the cell group is configured with second DRX configuration information (e.g., length, period, or offset of the monitoring or activation interval (on-duration)) to perform PDCCH monitoring over a very long period. For example, if a terminal receives an indicator to abort the cell group, it applies the second DRX configuration information to perform PDCCH monitoring based on a very long period and conserve terminal power. Alternatively, if a terminal receives an indicator to abort the cell group, it applies the partial bandwidth configuration information related to the PSCell of the cell group to activate or switch the dormant partial bandwidth for the downward link partial bandwidth of the PSCell of the cell group and perform the terminal operation in a cell with an activated dormant partial bandwidth as proposed in this disclosure. Also, if a terminal receives an indicator to abort the cell group, it deactivates all SCells configured in the cell group. Alternatively, if a terminal receives an instruction to abort a cell group, it may activate or switch the dormant partial bandwidth for the downlink partial bandwidth of SCells configured in the cell group for SCells that have a dormant partial bandwidth configured, and perform the terminal operation in cells with activated dormant partial bandwidth as proposed in this disclosure, or deactivate SCells that do not have a dormant partial bandwidth configured. Alternatively, if a terminal receives an instruction to abort a cell group in an RRC message, it may activate, deactivate or put each SCell into sleep mode, activate a dormant partial bandwidth, or activate, deactivate or put each SCell in the cell group into sleep mode, or activate a dormant partial bandwidth, based on the configuration information or instruction relating to each SCell of the cell group contained in the RRC message, or activate, deactivate or put each SCell of the cell group into sleep mode, based on a PDCCH instruction (e.g., bitmap), MAC control information, or RRC message before or after receiving an instruction to abort a cell group.

[0274] - Configuration information related to transmission resources that perform channel measurements in a dormant partial bandwidth or a partial bandwidth that is not a dormant partial bandwidth, and report the measurement results (e.g., PUCCH transmission resource information for PCell, PUCCH SCell, or PSCell)

[0275] - If the instruction includes a command to restart (or activate) the state of the cell group, the PSCell of the cell group is configured with first DRX configuration information (e.g., length, period, or offset of the monitoring or activation interval (on-duration)) to enable further PDCCH monitoring. Alternatively, the first DRX configuration information that was stored for the cell group is recovered and applied. For example, if a terminal receives a command to restart the cell group, it applies the first DRX configuration information that was stored or received from the RRC message, performs PDCCH monitoring, and resumes data transmission or data reception. Alternatively, if a terminal receives a command to restart the cell group, it applies the partial bandwidth configuration information relating to the PSCell of the cell group, activates or switches the downlink partial bandwidth of the PSCell of the cell group to a partial bandwidth that is not a dormant partial bandwidth (e.g., a partial bandwidth set by the RRC message), and performs the terminal operation in a cell where the general partial bandwidth (a partial bandwidth that is not a dormant partial bandwidth) proposed in this disclosure is activated. Alternatively, if the terminal receives an instruction to restart the cell group, it applies the stored or received random access configuration information (such as random access transmission resource information for transmitting the preamble (time transmission resource or frequency transmission resource), or specified preamble information) to trigger a random access procedure in the cell group's PSCell.Alternatively, when a terminal receives an instruction to restart a cell group, if the RRC message contains random access configuration information (such as random access transmission resource information for transmitting a preamble (time transmission resource or frequency transmission resource), or specified preamble information), it applies the random access configuration information and triggers a random access procedure (e.g., a contention-free random access procedure) in the cell group's PSCell. If the RRC message instructing the restart or activation of the cell group does not contain random access configuration information (such as random access transmission resource information for transmitting a preamble (time transmission resource or frequency transmission resource), or specified preamble information), it triggers a random access procedure (e.g., a contention-based random access procedure) in the cell group's PSCell, or, based on system information, a random access procedure (contention-based random access or 2-step random access). The terminal triggers an access. If there is any random access configuration information stored in the terminal before receiving the instruction to restart the cell group (such as random access transmission resource information for transmitting a preamble (time transmission resource or frequency transmission resource), or specified preamble information), it is released or discarded. Alternatively, the terminal performs PDCCH monitoring in the indicated or configured cell group or cell and triggers and performs random access procedures as instructed by the PDCCH.

[0276] -If an instruction to restart (or activate) the state of a cell group is included, or if the terminal receives an instruction to restart the cell group, it activates all SCells set in the cell group. Or, if the terminal receives an instruction to restart the cell group, for SCells set in the cell group, it activates or switches the downlink partial bandwidth for SCells with a dormant partial bandwidth set, or a partial bandwidth that is not a dormant partial bandwidth (e.g., a partial bandwidth set by an RRC message, or the first activated partial bandwidth), and performs the terminal operation in a cell where a partial bandwidth that is not a dormant partial bandwidth is activated as proposed in this disclosure, or activates SCells that do not have a dormant partial bandwidth set. Alternatively, if a terminal receives an instruction to restart a cell group via an RRC message, it may activate, deactivate, or put each SCell of the cell group to sleep, or activate a dormant partial bandwidth, based on the configuration information or instruction related to each SCell of the cell group included in the RRC message, or, before or after receiving the instruction to restart the cell group, it may activate, deactivate, or put each SCell of the cell group to sleep, or activate a dormant partial bandwidth, based on the PDCCH instruction (e.g., bitmap), MAC control information, or RRC message.

[0277] - Indicator for adding cell group settings

[0278] - Indicator to remove cell group setting

[0279] - Security setting information (security key information, security key information for cell group, or additional information (e.g., sk-counter))

[0280] - Indicators that signal handover, cell group addition, or cell group modification (e.g., ReconfigurationWithSync indicator or mobilitycontrolInfo indicator)

[0281] - Channel measurement setting information for each cell or each partial bandwidth

[0282] - Channel measurement setting information for each cell or each partial bandwidth

[0283] - Indicator for adding cell group settings, indicator for indicating cell group change (ReconfigurationWithSync), or indicator for indicating random access procedure (ReconfigurationWithSync, or newly defined indicator)

[0284] - Indicator (ReconfigurationWithSync, or newly defined indicator) for indicating whether to perform a random access procedure when activating a cell group, and whether to activate the cell group with or without a random access procedure

[0285] - RRM (radio resource management) setting information, frequency measurement setting information, RRM (radio resource management) setting information or frequency measurement setting information to be applied or performed when deactivating a cell group (e.g., reduced or relaxed RRM setting information for battery saving)

[0286] - Configuration information for RLM (radio link monitoring) or configuration information for RLM that must be applied or performed when a cell group is deactivated. For example, the configuration information for RLM, or the configuration information for RLM that must be applied or performed when a cell group is deactivated, may also include cell-level beam configuration information or partial bandwidth-specific beam configuration information that the terminal must measure when the cell group is deactivated, and may include beam-related configuration information (TCI (transmission configuration indication) state or QCL (quasi co-location)). Alternatively, the configuration information for RLM, or the configuration information for RLM that must be applied or performed when a cell group is deactivated, may also include a TA (timing advance) value (or offset value) for synchronizing the base station's downlink signal or the base station's uplink signal, a timer (TAT: time alignment timer) indicating the validity of the TA value, or a timer value (TAT value). Alternatively, the configuration information for RLM, or the configuration information for RLM that must be applied or performed when a cell group is deactivated, includes the SSB (synchronization signal block) configuration information, CSI-RS (channel state information reference signal) configuration information, RS (reference signal) configuration information, and, in the event of a beam failure, transmission resource information to report the results (e.g., PUCCH configuration information (e.g., SR (scheduling request) information or specific transmission resource), frequency transmission resource, or time transmission resource). The configuration information also includes partial bandwidth configuration information (e.g., may be indicated by a partial bandwidth identifier) ​​that indicates in which partial bandwidth the RLM procedure should be performed.Alternatively, when the cell group state is inactive, the terminal may perform the RLM procedure on the first activated partial bandwidth (or the first activated downlink partial bandwidth (firstActiveDownlinkBWP-ID)) set by the RRC message, and when activating the cell group, monitor the first activated partial bandwidth that must be activated as soon as possible to minimize the cell group activation delay. Alternatively, when the cell group state is set to inactive (or activated), the terminal may perform the RLM procedure on the partial bandwidth that was last (or previously) activated before the cell group state was deactivated, and continue to maintain the connection with the cell group (e.g., if partial bandwidth configuration information indicating which partial bandwidth to perform the RLM procedure on is not set), or when activating the cell group, perform the activation procedure on the first activated partial bandwidth (or the first activated downlink partial bandwidth (firstActiveDownlinkBWP-ID)) set by the RRC message. If, when activating a cell group, there is no partial bandwidth-related configuration information specifying which partial bandwidth to use for the RLM procedure, the terminal will perform the RLM procedure on the last (or previously) activated partial bandwidth. The configuration information also includes beam-related configuration information (e.g., a partial bandwidth identifier, or possibly indicated by the TCI state or QCL configuration information) specifying which beam to use for the RLM procedure. Alternatively, when the cell group state is inactive, the terminal will either perform the RLM procedure on the beam specified by the RRC message (e.g., the TCI state or QCL configuration information), or activate a beam to perform the RLM procedure and then activate the cell group, minimizing the cell group activation delay by monitoring the beam that needs to be activated as early as possible.Alternatively, when the cell group state is set to the deactivated state (or the activated state), the terminal may perform the RLM procedure in the beam that was last (or previously) activated before the cell group state is deactivated, and continue to maintain the connection state with the cell group (e.g., when beam-related configuration information indicating in which beam to perform the RLM procedure is not set), or when activating the cell group, perform the activation procedure in the beam set by the RRC message. If beam-related configuration information indicating in which beam to perform the RLM procedure is not set when activating the cell group, the terminal shall perform the RLM procedure in the beam that was last (or previously) activated.

[0287] - Beam failure detection procedures, configuration information for BFD (beam failure detection), or configuration information for BFD that must be applied or performed when a cell group is deactivated, for example, beam failure detection procedures, configuration information for BFD, or configuration information for BFD that must be applied or performed when a cell group is deactivated, are cell-level beam configuration information that the terminal must measure when a cell group is deactivated, or beam configuration information for each partial bandwidth, and include beam-related configuration information (TCI (transmission configuration indication) state or QCL (quasi co-location)). Alternatively, beam failure detection procedures, configuration information for BFD, or configuration information for BFD that must be applied or performed when a cell group is deactivated, include a TA (timing advance) value (or offset value) for synchronizing the base station's downlink signal or the base station's uplink signal, a timer (TAT: time alignment timer) indicating the validity of the TA value, or a timer value (TAT value). Alternatively, the beam failure detection procedure, the configuration information for BFD, or the configuration information for BFD that must be applied or performed when a cell group is deactivated, includes the SSB (synchronization signal block) configuration information, CSI-RS (channel state information reference signal) configuration information, RS (reference signal) configuration information, and, if a beam failure occurs, transmission resource information to report the results (e.g., PUCCH configuration information (e.g., SR (scheduling request) information or specific transmission resource), or frequency transmission resource or time transmission resource). The configuration information also includes partial bandwidth configuration information (e.g., which may be indicated by a partial bandwidth identifier) ​​that indicates which partial bandwidth the beam failure detection procedure should be performed in.Alternatively, when the cell group state is inactive, the terminal may perform the beam failure detection procedure in the first activated partial bandwidth (or the first activated downlink partial bandwidth (firstActiveDownlinkBWP-ID)) set by the RRC message, and when activating the cell group, monitor the first activated partial bandwidth that must be activated as soon as possible to minimize the cell group activation delay. Alternatively, when the cell group state is set to inactive (or activated), the terminal may perform the beam failure detection procedure in the partial bandwidth that was last (or previously) activated before the cell group state was deactivated, and continue to maintain the connection with the cell group (e.g., if partial bandwidth setting information indicating which partial bandwidth to perform the beam failure detection procedure in is not set), or when activating the cell group, perform the activation procedure in the first activated partial bandwidth (or the first activated downlink partial bandwidth (firstActiveDownlinkBWP-ID)) set by the RRC message. If, when activating a cell group, partial bandwidth-related configuration information indicating which partial bandwidth should be used for beam failure detection procedures is not configured, the terminal will perform beam failure detection procedures on the last (or previously) activated partial bandwidth. The configuration information may also include beam-related configuration information (e.g., indicated by a partial bandwidth identifier, TCI state, or QCL configuration information) indicating which beam should be used for beam failure detection procedures. Alternatively, when the cell group state is inactive, the terminal will perform beam failure detection procedures on the beam configured by the RRC message (e.g., TCI state or QCL configuration information), minimizing cell group activation delay by monitoring the beams that need to be activated earlier when activating the cell group.Alternatively, if the cell group state is set to deactivated (or activated), the terminal may perform the beam failure detection procedure on the beam that was last (or previously) activated before the cell group state was deactivated, and continue to maintain the connection with the cell group (e.g., if no beam-related configuration information is set indicating which beam to perform the beam failure detection procedure on), or, when activating the cell group, perform the activation procedure on the beam set by the RRC message. If, when activating the cell group, no beam-related configuration information is set indicating which beam to perform the beam failure detection procedure on, the terminal will perform the beam failure detection procedure on the beam that was last (or previously) activated.

[0288] - The message introduces and sets a first timer (e.g., T304), a second timer (e.g., T310), a third timer (e.g., T312), or a fourth timer (e.g., a fallback timer) to efficiently perform the dual connection technology setup procedure (or SCG setup procedure) or handover procedure. The timers are proposed to be driven and applied during the dual connection technology setup procedure or handover procedure. The first timer (e.g., T304) is a timer for determining whether the dual connection technology setup procedure or handover procedure has been successfully performed, the second timer (e.g., T310) is a timer for determining whether the radio connection is valid, and the third timer (e.g., T312) is an auxiliary timer for determining whether the radio connection is valid, and is a timer for triggering the frequency measurement procedure and reporting the frequency measurement results. The fourth timer (e.g., a fallback timer) is introduced to attempt to activate a cell group (or SCG or PSCell) by performing a fallback procedure in a random access procedure (a general random access procedure (a four-step random access procedure or a two-step random access procedure)) if it fails to activate the cell group (i.e., the timer expires) without the random access procedure proposed in this disclosure. The fourth timer is also the first timer, and the first timer is used as the fallback timer.

[0289] In RRC messages (e.g., RRCReconfiguration messages), if an indicator to abort (or deactivate) a cell group is included, it is suggested that indicators to perform a handover, add a cell group, or modify a cell group (e.g., the ReconfigurationWithSync indicator or the mobilitycontrolInfo indicator) should not be included. Conversely, if an indicator to restart a cell group or configuration information to set is included, it is suggested that indicators to perform a handover, add a cell group, or modify a cell group (e.g., the ReconfigurationWithSync indicator or the mobilitycontrolInfo indicator) should be included. This is because restarting a cell group requires further linking with that cell group, which necessitates synchronization, receiving system information, or, if necessary, performing random access procedures. For example, when a base station uses an RRC message to deactivate a terminal's cell group, it may restrict the setting of a cell group add directive, a cell group change directive, a directive to initiate a random access procedure, or a ReconfigurationWithSync directive simultaneously, thereby preventing the terminal from performing unnecessary synchronization, linking, or random access procedures.

[0290] In this disclosure, we propose a new concept called "dormant bandwidth" for next-generation mobile communication systems, and specifically propose terminal operations in each bandwidth when transitioning or switching between them.

[0291] Figure 1G is a diagram illustrating state transitions or partial bandwidth switching procedures according to one embodiment of the present disclosure.

[0292] Referring to Figure 1G, in one embodiment, the partial bandwidth (BWP) of each cell (e.g., SCell or PSCell) in each cell group of the terminal is activated with a general partial bandwidth (1g-01), activated with a dormant partial bandwidth (1g-02), or deactivated (1g-03). The partial bandwidth of each cell in each cell group of the terminal is activated or deactivated with a general partial bandwidth or dormant partial bandwidth based on setting information in the RRC message, MAC control information, or instructions from the DCI of the PDCCH.

[0293] The state transition behaviors (activation, deactivation, or dormancy) of cell subbandwidths proposed in this disclosure, or the actions of activating a general subbandwidth, activating a dormant subbandwidth, activating the first activated subbandwidth to be activated from dormancy, or deactivating a general subbandwidth or a dormant subbandwidth, are performed by one of the following instructions or settings:

[0294] -If a cell's partial bandwidth state is set by an RRC message, or if each cell's partial bandwidth is set by an RRC message and a dormant partial bandwidth is set for a cell, or if the initial activated partial bandwidth is set to a dormant partial bandwidth, then the cell is switched to or activated to the dormant partial bandwidth and begins performing operations in the dormant partial bandwidth.

[0295] - If MAC CE is received for cell activation, deactivation, or dormancy

[0296] -When a MAC CE is received to activate or deactivate the general partial bandwidth, the first activated partial bandwidth from dormancy, or the dormant partial bandwidth.

[0297] - When a DCI for PDCCH is received that instructs to activate, deactivate, or switch the general partial bandwidth, the first activated partial bandwidth from dormant, or the dormant partial bandwidth.

[0298] - If a cell in an activated state does not have a cell dormancy timer set, and the set cell deactivation timer expires.

[0299] - If no partial bandwidth sleep timer is set for the active partial bandwidth, and the set partial bandwidth state deactivation timer (e.g., bwpInactivityTimer) expires.

[0300] Furthermore, the state transition operation or dormant partial bandwidth operation method proposed in this disclosure has the following characteristics:

[0301] -Spcells (Pcells or Pscells, or the downlink or uplink bandwidth of a cell) do not have a dormant bandwidth set, and only the general bandwidth is set and they are always active. Spcells must be kept in an active state at all times in order to synchronize and transmit and receive the main control signals, because if a portion of the Spcell's bandwidth is put into sleep or deactivated, or if it is operated in a dormant bandwidth, the connection with the base station will be disconnected.

[0302] -This refers to a partial bandwidth of a Scell ​​or SCell, but if PUCCH is set, the dormant state or dormant partial bandwidth will not be set. With PUCCH, the active state or general partial bandwidth must be activated and used because there are other cells that must send feedback such as HARQ ACK / NACK.

[0303] -Due to the characteristics described above, the ScellDeactivationTimer or partial bandwidth sleep timer does not apply to Spcells or the partial bandwidth of Spcells, nor to the partial bandwidth of Scells or SCells for which PUCCH is set, but only to other Scells.

[0304] - The cell or partial bandwidth hibernation timer (ScellHibernationTimer) has a higher priority than the cell or partial bandwidth deactivation timer (ScellDeactivationTimer). Then, if one value is set with an RRC message for the timer value, the same value is applied to all cells. Alternatively, considering the characteristics per Scell or per BWP, the base station can apply different timer values per Scell or per BWP.

[0305] - If a cell or partial bandwidth is not instructed to be activated or hibernated with an RRC message, basically, it initially operates in the deactivated state.

[0306] In the present disclosure, the uplink indicates the uplink partial bandwidth, and the downlink indicates the downlink partial bandwidth. This is because only one activated or hibernated partial bandwidth can be operated per uplink or per downlink.

[0307] In the present disclosure, when operating in the activated state, deactivated state, or hibernated state, and when a cell or partial bandwidth makes a transition or switching, it is performed in units of partial bandwidth. When a state transition or switching occurs in units of partial bandwidth, the partial bandwidth (downlink partial bandwidth or uplink partial bandwidth) for which the state transition or switching is instructed is subject to the state transition or switching according to the instruction of the state transition or switching. For example, if a partial bandwidth (downlink or uplink partial bandwidth) is to transition from the activated state to the hibernated state, or switch to the hibernated partial bandwidth (or be activated), the partial bandwidth is transitioned to the hibernated state, or switched (or activated) to the hibernated partial bandwidth.

[0308] In this disclosure, partial bandwidth switching (BWP switching) means that when partial bandwidth switching is instructed using the DCI of the PDCCH, if a downlink assignment is assigned and switching is instructed using a partial bandwidth identifier, the downlink partial bandwidth will be switched to the partial bandwidth indicated by the partial bandwidth identifier. Similarly, when partial bandwidth switching is instructed using the DCI of the PDCCH, if a UL grant is assigned and switching is instructed using a partial bandwidth identifier, the uplink partial bandwidth will be switched to the partial bandwidth indicated by the partial bandwidth identifier. Furthermore, because the DCI format of the PDCCH itself differs between the format for downlink assignment (format1) and the format for UL grant (format0), terminal operation can be performed according to the DCI format without needing to explain the uplink and downlink separately.

[0309] The method of operating state transitions at the proposed bandwidth part level and the operation of the bandwidth part level for each state are extended and applicable to various embodiments. Specific embodiments that extend and apply the proposed concepts in this disclosure are described below.

[0310] Figure 1H is a diagram illustrating a DRX setting or DRX operation method that can conserve the battery of a terminal, according to one embodiment of the present disclosure.

[0311] In Figure 1H, the base station configures the terminal, via an RRC message as shown in Figure 1F, to set DRX functions such as the DRX period, its start point, its offset, or its on-duration (active time) in a PCell, SCell, or PSCell. In this disclosure, setting the DRX functions in a PCell, SpCell, or PSCell is considered.

[0312] If the DRX function is configured on the PCell (or SpCell or PSCell), the terminal applies the DRX function, taking into account the DRX period (1h-03) and the DRX start time or its offset. When the DRX function is applied, the terminal monitors the PDCCH or the DCI of the PDCCH received from the base station in the PCell only during the DRX activation time interval (on-duration or active time (1h-01)). Outside the DRX activation time interval (outside active time (1h-02)), the terminal does not monitor the PDCCH or the DCI of the PDCCH, which can reduce the terminal's battery consumption.

[0313] In Figure 1H, the base station sets a power saving function (power saving mode) on the terminal via an RRC message to further improve battery consumption reduction. If the power saving function is set together with the DRX function, the terminal will monitor the PDCCH outside the active time period (1h-04) set in the RRC message, before the active time (1h-01) in the DRX function, and will monitor and receive the WUS (wake up signal) signal outside the active time period. In the DCI bit of the PDCCH in the WUS signal, the base station indicates whether the terminal must monitor the PDCCH during the next active time (1h-05, 1h-07) or whether it does not need to.

[0314] In other words, a terminal with a power saving function or DRX function enabled monitors the WUS signal for a short time interval (1h-04) set by the RRC message before each activation time (1h-05). If the received WUS signal has a value of 0 (or 1) for the DCI bit of the PDCCH related to the next activation time (1h-05, 1h-07), the terminal is instructed not to monitor the PDCCH during the next activation time (1h-07), or the MAC layer is instructed not to drive the timer corresponding to the next activation time, thereby preventing the terminal from monitoring the PDCCH. If the received WUS signal contains a value of 1 (or 0) for the DCI bit of the PDCCH relating to the next activation time (1h-05, 1h-07), the terminal is instructed to monitor the PDCCH during the next activation time (1h-05), or to drive the timer corresponding to the next activation time at the MAC level and instruct the terminal to monitor the PDCCH.

[0315] Furthermore, the terminal does not monitor the WUS signal or the PDCCH for WUS signal detection during the activation time interval.

[0316] Furthermore, terminals with power saving or DRX functions enabled will monitor the WUS signal for a short time interval (1h-04) set by an RRC message before each activation time (1h-05), checking the PDCCH using the first RNTI identifier (e.g., PS-RNTI) and detecting the signal. The first RNTI identifier (e.g., PS-RNTI) is set for multiple terminals, and the base station uses the first RNTI identifier (e.g., PS-RNTI) to instruct multiple terminals at once whether to monitor the PDCCH or not during the next activation time interval.

[0317] Furthermore, terminals with power saving or DRX functions enabled will, during the activation time (1h-05), monitor and detect PDCCH, and detect signals based on a second RNTI (e.g., C-RNTI), third RNTI (e.g., MCS-C-RNTI), or fourth RNTI (SPS-C-RNTI or CS-RNTI) configured to be specific to RRC messages. The second RNTI (e.g., C-RNTI) is used to indicate the general scheduling of the terminal, the third RNTI (e.g., MCS-C-RNTI) is used to indicate the modulation and coding scheme of the terminal, and the fourth RNTI (SPS-C-RNTI or CS-RNTI) is used to indicate the periodic transmission resources of the terminal.

[0318] Based on the method proposed in Figure 1H, the base station instructs the status of the terminal's cell or cell group to be activated, deactivated, or put into sleep mode using the DCI of the PDCCH during the activation time (1h-05) or short time interval (1h-04) set by the RRC message. The terminal also performs PDCCH monitoring procedures to receive instructions regarding the status of the cell or cell group during the activation time (1h-05) or short time interval (1h-04) set by the RRC message. If dual connection technology is configured at the terminal, the terminal monitors the PDCCH at the MCG's PCell for an activation time (1h-05) or a short time interval (1h-04) set by the RRC message, and the PDCCH's DCI receives instructions regarding the activation, deactivation, or dormancy state of the MCG's cell (SCell) or SCG's PSCell (or SCell), and the terminal performs the activation, deactivation, dormancy, or switching procedure for the cell (or partial bandwidth) accordingly. In other words, the base station instructs the terminal of the MCG's cell (SCell) or SCG's PSCell (or SCell) using the PDCCH's DCI for an activation, deactivation, or dormancy state at the MCG's PCell for an activation time (1h-05) or a short time interval (1h-04) set by the RRC message.

[0319] Figure 1I is a diagram illustrating a concept of a method for operating a dormant partial bandwidth in an activated SCell or PSCell according to one embodiment of the present disclosure.

[0320] As shown in Figure 1I, the base station configures multiple SCells on the terminal via RRC messages for carrier integration technology, assigns a SCell identifier to each SCell, and sets a dormant bandwidth for each SCell, or configures multiple cell groups for duplexing technology and assigns a cell group identifier. The base station also configures or instructs the terminal to set a cell group cancellation indicator for each cell group or for each PSCell in each cell group, and sets a dormant bandwidth. The base station configures the terminal to include multiple SCells in each SCell group, and one SCell group contains multiple SCells.

[0321] According to one embodiment, each SCell group is assigned a SCell group identifier, and multiple SCell identifiers are set to be included in or mapped to each SCell group identifier. The SCell identifier value or SCell group identifier value is assigned a predetermined bit value and has an integer value (or a natural number (integer value)). Alternatively, the PSCell of each cell group is indicated by the cell group identifier.

[0322] In Figure 1I, the base station, in one embodiment, defines a new bitmap in the DCI of the PDCCH transmitted in the PCell, and maps each bit value of the bitmap to indicate each SCell identifier value, each SCell group identifier value, cell group (or secondary cell group) identifier, or PSCell (or SCell) of the cell group (or secondary cell group). The base station also defines each bit value and instructs whether to switch to the dormant bandwidth, activate the dormant bandwidth, discontinue the cell group, or restart the cell group for the SCell, SCell belonging to the SCell group, cell group (or secondary cell group), or PSCell (or SCell) of the cell group (or secondary cell group) corresponding to the bit. Furthermore, the base station instructs whether to switch from the dormant partial bandwidth to the general partial bandwidth (e.g., the first activated partial bandwidth to activate from dormancy) or to activate the general partial bandwidth (e.g., the first activated partial bandwidth to activate from dormancy) for the SCell corresponding to the bit, the SCell belonging to the SCell group, the cell group (or secondary cell group) identifier, or the PSCell (or SCell) of the cell group (or secondary cell group).

[0323] In Figure 1I, the terminal, after receiving the DCI of the PDCCH in PCell(1i-01), reads the DCI and checks whether there is a bitmap containing instructions related to a partial bandwidth of a SCell or SCell group (e.g., switching to or activating a dormant partial bandwidth, or switching to or activating a general partial bandwidth), or instructions to stop or restart a cell group (or secondary cell group), or a PSCell (or SCell) of a cell group (or secondary cell group). If a bitmap exists, the terminal switches or activates a partial bandwidth or stops or restarts a cell group for each bit of the bitmap indicated by the SCell or SCell group (1i-02, 1i-03), cell group (or secondary cell group), or PSCell (or SCell) of the cell group (or secondary cell group).

[0324] For example, if the bits of the bitmap indicate the first SCell (or first SCell identifier (1i-02)), a cell group (or secondary cell group), or a PSCell (or SCell) of a cell group (or secondary cell group), or a group of SCells (or a SCell group identifier) ​​that contains the first SCell, and the bit value is 0 (or 1), then the terminal will indicate the first SCell (1i-02), the cell group (or secondary cell group) For a PSCell (or SCell) of a cell group (or secondary cell group), a partial bandwidth (1i-21) can be activated to a dormant partial bandwidth (1i-22), or the currently active partial bandwidth can be switched to a dormant partial bandwidth (1i-22), or if the currently active partial bandwidth is not a dormant partial bandwidth, the currently active partial bandwidth (1i-21) can be switched to or activated to a dormant partial bandwidth (1i-22) (1i-25), or the cell group can be deactivated or deactivated. Alternatively, the partial bandwidth of a cell group (or secondary cell group), or a PSCell (or SCell) of a cell group (or secondary cell group), can be maintained as is, and the second DRX configuration information or second SRS configuration information proposed in this disclosure can be applied to perform PDCCH monitoring at long intervals or SRS transmission at long intervals to reduce terminal power consumption.

[0325] In Figure 1I, the terminal, after receiving the DCI of PDCCH in PCell(1i-01), reads the DCI and checks whether there is a bitmap containing instructions relating to a partial bandwidth of a SCell or SCell group (e.g., switching to or activating a dormant partial bandwidth, or switching to or activating a general partial bandwidth), or instructions relating to a partial bandwidth of a cell group (or secondary cell group), a PSCell (or SCell) of a cell group (or secondary cell group), or instructions to suspend or resume a cell group. If a bitmap exists, the terminal switches or activates the partial bandwidth or suspends or resumes the cell group for each bit of the bitmap indicated by the SCell, SCell (1i-02, 1i-03) belonging to the SCell group, cell group (or secondary cell group), or PSCell (or SCell) of the cell group (or secondary cell group).

[0326] For example, if a bit in a bitmap indicates a second SCell (or second SCell identifier (1i-03)), or a group of SCells (or SCell group identifier) ​​containing the second SCell, a cell group (or secondary cell group), or a PSCell (or SCell) of a cell group (or secondary cell group), and the bit value is 1 (or 0), the terminal checks for the second SCell (1i-03) whether the currently activated partial bandwidth is a dormant partial bandwidth (1i-32 ), if the currently activated partial bandwidth is not a general partial bandwidth, or if a partial bandwidth (or cell) is currently activated and the currently activated partial bandwidth is a dormant partial bandwidth (1i-32) (or if a partial bandwidth that is not a general partial bandwidth is activated), then the partial bandwidth of the second SCell (1i-03) is switched to or activated (1i-35) to the partial bandwidth set by the RRC message (e.g., the first activated partial bandwidth activated from dormancy, 1i-33), or the cell group is restarted or activated.

[0327] According to one embodiment, since the bit value is 1 (or 0), if the SCell, SCell belonging to the SCell group, cell group (or secondary cell group), or PSCell (or SCell) of the cell group (or secondary cell group) indicated by the bit must be switched or activated to a partial bandwidth that is not a dormant partial bandwidth, or if the cell group must be restarted, each SCell belonging to the SCell or Scell ​​group shall not apply, ignore, or read the bit value if the SCell state is inactive, or if the SCell state is active and the activated partial bandwidth is not a dormant partial bandwidth (or is a general partial bandwidth). Alternatively, if the cell group (or secondary cell group), or PSCell (or SCell) of the cell group (or secondary cell group) is already active or restarted, the bit value shall not apply, ignore, or read. Furthermore, if the bit value is 0 (or 1), and the SCell, or SCell belonging to the SCell group, cell group (or secondary cell group), or PSCell (or SCell) of the cell group (or secondary cell group) indicated by the bit must be switched to or activated to a dormant partial bandwidth, or the cell group must be aborted, each SCell belonging to the SCell or Scell ​​group shall not apply, ignore, or read the bit value if the SCell state is activated and the activated partial bandwidth is a dormant partial bandwidth. Alternatively, if the cell group (or secondary cell group), or PSCell (or SCell) of the cell group (or secondary cell group) is already aborted or deactivated, the bit value shall not apply, ignore, or read.

[0328] In this disclosure, a method for accelerating the activation of cells (SCell, PSCell, or SCell) is proposed below.

[0329] Specifically, the base station uses an RRC message (RRCReconfiguration or RRCResume) to configure first channel measurement configuration information that allows a terminal to quickly measure and report channels when activating a cell. In order to quickly activate a cell group (or cell), or for the base station to transmit channel measurement signals more frequently or efficiently temporarily, the first channel measurement configuration information includes frequent channel measurement signals (e.g., radio resource, TRS (temporary reference signal), SSB (synchronization signal block), CSI-RS (channel state information reference signal), or RS (reference) in the configuration information of the cell in the cell group (e.g., PCell, PSCell, or SCell). The first channel measurement setting information includes setting information such as the period related to the signal, the transmission resource information to be transmitted (frequency or time transmission resource to which the frequent channel measurement signal is transmitted), its interval, its number of times (number of times the frequent channel measurement signal is transmitted), its timer value (time to which the frequent channel measurement signal is transmitted), or time interval (the interval to which the frequent channel measurement signal is transmitted (e.g., offset of time unit (slot, subframe, or symbol))). The first channel measurement setting information also includes setting information such as the transmission resource to which the terminal must report the measured results, its period, its interval, its timing, or its offset.

[0330] The first channel measurement configuration information sets a shorter reporting cycle (or transmission resource) for the terminal to report channel measurement results, or the base station configures transmission resources for channel measurement so that it can transmit many channel measurement signals (or transmission resources (e.g., radio resource or TRS (temporary reference signal))) more frequently or more often, in order to support faster channel measurement or many signal measurements by the terminal. The first channel measurement configuration information includes configuration information relating to channel measurement signals for a specific terminal (or terminal) in a cell or partial bandwidth, which the base station configures.

[0331] According to one embodiment, the first channel measurement setting information is set differently for each cell or partial bandwidth for each of the multiple cells or partial bandwidths set by the RRC message, and beam-related setting information (TCI (transmission configuration indication) state or QCL (quasi co-location)) such as beam direction, beam number or beam position is set together to help the terminal easily measure the transmission resources for measuring the channel.

[0332] According to one embodiment, the first channel measurement setting information enables the terminal to correctly perform channel measurement or channel measurement reporting by setting a TA (timing advance) value (or offset value) for synchronizing the base station's downlink signal or the base station's uplink signal, a timer (TAT: time alignment timer) that indicates the validity of the TA value, or a timer value (TAT value). For example, the first channel measurement setting information includes the period of the channel measurement signal, or the number of signals to be transmitted, the period during which the signal is transmitted, an offset related to the time during which the signal is transmitted, or the time length between transmitted signals. Alternatively, the first channel measurement setting information includes a list relating to multiple channel measurement signals to be transmitted, a time transmission resource (or frequency transmission resource) indicating the position of the transmitted signals, a transmission resource (time transmission resource or frequency transmission resource) for reporting the measured results, a period for reporting the measured results, or beam-related setting information (TCI (transmission configuration indication) state or QCL (quasi co-location)) for measuring the channel measurement signal.

[0333] Furthermore, the first channel measurement configuration information set by the RRC message includes multiple channel measurement signal information. By specifying one of the multiple channel measurement signal information or beam configuration information set by the RRC message, MAC CE, or DCI, the terminal applies or uses the specified channel measurement signal information or beam configuration information to perform channel measurement or report channel measurement. The instruction method defines a mapping between bitmaps, indices, identifiers, and each configured channel measurement signal information, and instructions are given based on this. Alternatively, channel measurement signal information is set or specified by the RRC message or MAC CE. The terminal applies or uses the set (or specified) channel measurement signal information to perform channel measurement or report channel measurement.

[0334] Alternatively, when setting the terminal with a first channel measurement configuration information via an RRC message, when setting the cell state to the activated state via an RRC message, and when instructing the cell to be activated via an RRC message, the first channel measurement configuration information is applied or used to measure or report the channel quickly and activate the cell quickly. For example, when setting the cell state to the activated state via an RRC message, and instructing the cell to be activated via an RRC message, the first channel measurement configuration information, channel measurement signal information, or beam-related configuration information to be applied is set separately as configuration information via an RRC message (default configuration), or if only channel measurement signal information (or beam-related configuration information) corresponding to identifier 0, or if only one channel measurement signal information (or beam-related configuration information) is set, that channel measurement signal information (or beam-related configuration information) is applied.

[0335] The first channel measurement setting information according to one embodiment of this disclosure can only be set for the downward link bandwidth setting information of each cell. In other words, the first channel measurement setting information according to one embodiment of this disclosure does not set for the upward link bandwidth setting information of each cell. This is because, for the downward link, the terminal must first measure the channel before it can report the measurement results for that channel or cell, correctly receive the PDCCH, and follow instructions related to the base station.

[0336] The first channel measurement configuration information proposed in this disclosure is initially deactivated when configured by an RRC message or after a handover, and is subsequently activated by the MAC control information, PDCCH DCI information, or RRC message proposed in this disclosure. When configured by an RRC message, initializing it to a deactivated state allows the base station to easily manage the terminal's cell state or channel measurement procedure, and ensures accurate timing regarding when and how the terminal performs channel measurement without RRC message processing delay issues.

[0337] Furthermore, RRC messages (RRCReconfiguration or RRCResume) include or set second channel measurement configuration information. Second channel measurement configuration information includes general channel measurement configuration information such as the transmission resources for the channel measurement signal, its period, its time interval or number of times, or the transmission resources for channel measurement reporting, its period or time interval.

[0338] In this disclosure, as proposed, when first channel measurement setting information or second channel measurement information is set in the terminal by an RRC message, a structure or instruction method for MAC control element is proposed that activates the cell and, based on the first channel measurement setting information, quickly measures the channel or reports the measurement result and quickly activates the cell. For example, the MAC control information (or RRC message) proposed in this disclosure instructs which of the multiple cells (SCells) set in the RRC to activate or deactivate, or, if it instructs which cell to activate, which measurement signal information from the first channel measurement setting information set by the RRC message to apply, how to measure the signal (e.g., instructing which signal transmission resource to measure, how many signals to transmit, in what time interval to measure, on what offset to determine the measurement time interval, at what period to measure the signal, or on which transmission resource to measure the signal), or how to report (e.g., instructing which measurement result to report, in what time interval to report the measurement result, on what offset to determine the measurement result reporting transmission resource, at what period to report the measurement result, or on which transmission resource to report the measurement result), and activates the cell quickly based on the first channel measurement setting information set by the RRC message.

[0339] Figure 1J is a diagram illustrating how an RRC deactivation mode terminal operates according to one embodiment of the present disclosure.

[0340] In this disclosure, a cell group or cell refers to a PCell of an MCG (master cell group), or a SCell of an MCG, a PSCell of a secondary cell group (SCG), or a SCell of an SCG.

[0341] In one embodiment, it is proposed that in RRC connection mode, SCell configuration information (e.g., the configuration information described or proposed in Figure 1F) or PSCell (or SCell) configuration information of a cell group (e.g., a secondary cell group) that has been set or saved for the proposed embodiment as shown in Figure 1F is not released or discarded even when the terminal transitions to RRC deactivation mode, but is instead continuously saved. Furthermore, it is proposed that when an RRC deactivation mode terminal performs the RRC connection restart procedure, it decides whether to discard or release the saved SCell configuration information (e.g., the configuration information described or proposed in Figure 1F) or PSCell (or SCell) configuration information of a cell group (e.g., a secondary cell group), maintain and apply it, or reconfigure it, via an indicator in an RRCResume message or RRCReconfiguration message transmitted by the base station, or via a reconfiguration procedure. Furthermore, when a base station transmits an RRCRelease message to a terminal that includes a setting or indicator for transitioning to RRC deactivation mode, the RRCRelease message also transmits to the terminal an indicator or setting information that instructs whether to discard or undo the stored SCell configuration information (e.g., the configuration information described or proposed in Figure 1F) or the PSCell (or SCell) configuration information of a cell group (e.g., a secondary cell group), maintain and apply it, or reconfigure it. Also, when a terminal performs a move in RRC deactivation mode and performs a RAN notification area update, it receives and applies the indicator or setting information transmitted by the base station to the terminal that instructs whether to discard or undo the stored SCell configuration information (e.g., the configuration information described or proposed in Figure 1F) or the PSCell (or SCell) configuration information of a cell group (e.g., a secondary cell group), maintain and apply it, or reconfigure it.

[0342] In the embodiments proposed in this disclosure, the base station allows the SCell configuration information of an RRC message (e.g., the configuration information described or proposed in Figure 1F) or the PSCell (or SCell) configuration information of a cell group (e.g., a secondary cell group) to set the initial activated partial bandwidth of the partial bandwidth configuration information for the downlink or uplink of each cell to the dormant partial bandwidth, thereby reducing battery consumption of the terminal when the terminal activates each SCell, each cell group, or the PSCell of each cell group, by immediately operating the downlink partial bandwidth or uplink partial bandwidth of each SCell, each cell group, or the PSCell of each cell group as the dormant partial bandwidth, or by stopping or restarting the cell group.

[0343] Alternatively, in embodiments proposed in this disclosure, the base station does not set the initial activated partial bandwidth of the partial bandwidth setting information for the downlink or uplink of each cell in the SCell setting information of the RRC message (e.g., the setting information described or proposed in Figure 1F) or the PSCell (or SCell) setting information of a cell group (e.g., a secondary cell group) to the dormant partial bandwidth, and when a terminal activates or restarts each SCell, each cell group, or the PSCell of each cell group, the downlink partial bandwidth or uplink partial bandwidth of each SCell, each cell group, or the PSCell of each cell group always activates the initial activated partial bandwidth, and switches or activates to the dormant partial bandwidth in embodiments proposed in this disclosure, or stops or restarts the cell group, thereby reducing terminal battery consumption.

[0344] Furthermore, in the proposed embodiment, the SCell configuration information or PSCell configuration information of each MCG (master cell group) or SCG (secondary cell group) of a terminal configured with dual connectivity technology is extended and applied. That is, the SCell configuration information or PSCell configuration information of the SCG is also saved when the terminal transitions to RRC deactivation mode, and when the RRC connection restart procedure is performed or the terminal transitions to RRC deactivation mode, an RRC message (e.g., RRCResume, RRCReconfiguration, or RRCRelease) is transmitted to the terminal, including an indicator or configuration information that instructs whether to discard or release the saved SCell configuration information of the MCG or SCG (e.g., the configuration information described in Figure 1F or the proposed configuration information), or PSCell configuration information, or to maintain and apply it, or to reconfigure it.

[0345] In Figure 1J, the terminal (1j-01) establishes a network connection with the base station (1j-02) and transmits and receives data (1j-05). If, for any predetermined reason, the base station needs to transition the terminal to RRC deactivation mode, the base station transmits an RRCRelease message (1j-20) and transitions the terminal to RRC deactivation mode. The RRC message (e.g., RRCRelease) transmits to the terminal an indicator or configuration information that instructs whether to discard or remove the stored SCell configuration information of the MCG or SCG (e.g., the configuration information described or proposed in Figure 1F), or the PSCell (or SCell) configuration information of the cell group (e.g., secondary cell group), maintain and apply it, or reconfigure it. In the case of terminals applying dual connectivity technology, the base station decides whether to suspend and reactivate the master cell group bearer settings, RRC setting information, MCG, or SCell setting information for SCG, and whether to suspend and reactivate the secondary cell group bearer settings and RRC setting information. To this end, the base station asks the secondary cell base station whether to suspend and reactivate, and makes a decision based on the response (1j-15). In addition, with the RRCRelease message, the base station sets the frequency list, frequency measurement setting information, or period for measuring frequencies that the terminal will measure in RRC idle mode or RRC deactivation mode.

[0346] An RRC deactivated mode terminal will perform the RRC reactivation procedure if it is in transit and receives a paging message (1j-25), or if it becomes necessary to transmit upward link data, or if it becomes necessary to update the RAN indicator area.

[0347] When a terminal needs to establish a connection, it performs a random access procedure and transmits an RRCResumeRequest message to the base station. The proposed terminal actions related to the transmission of this message are as follows (1j-30):

[0348] 1. The terminal checks the system information and, if the system information instructs it to transmit the complete terminal resumption identifier (I-RNTI or Full resume ID), it prepares to transmit the stored complete terminal resumption identifier (I-RNTI) in the message. If the system information instructs it to transmit a truncated terminal resumption identifier (truncated I-RNTI or truncated resume ID), the terminal prepares to construct the stored complete terminal resumption identifier (I-RNTI) with the truncated resume identifiers (truncated resume IDs) that have been divided in a predetermined manner, and transmit them in the message.

[0349] 2. The terminal recovers the RRC linking settings information and security context information from the saved terminal context.

[0350] 3. The terminal then updates the new KgNB security key corresponding to the master cell group based on the current KgNB security key, the NH (NextHop) value, and the NCC value received and saved in the RRCRelease message.

[0351] 4. If the terminal receives an SCG-counter value (or sk-counter) in the RRCRelease message, it updates the new SKgNB security key corresponding to the secondary cell group based on the KgNB security key and the SCG-counter value (or sk-counter) value.

[0352] 5. The terminal then uses the newly updated KgNB security key to generate new security keys (K_RRCenc, K_RRC_int, K_UPint, K_UPenc) to be used in integrity protection, verification procedures, and encryption and decryption procedures.

[0353] 6. Then, if the terminal receives an SCG-counter value (or sk-counter) in the RRCRelease message, it uses the newly updated SKgNB security key corresponding to the secondary cell group to generate new security keys (SK_RRCenc, SK_RRC_int, SK_UPint, SK_UPenc) to be used in integrity protection, verification procedures, and encryption and decryption procedures.

[0354] 7. The terminal then calculates the MAC-I and prepares to include it in the message for transmission.

[0355] 8. The terminal then resumes SRB1 (it must be resumed beforehand in order to receive the RRCResume message via SRB1 as a response to the RRCResumeRequset message that will be transmitted).

[0356] 9. Constitute the RRCResumeRequset message and propagate it to lower levels.

[0357] 10. For all bearers (MCG terminated RBs) except SRB0, which is part of the master cell group, apply the updated security key and the previously configured algorithm, restart defect protection and verification procedures, and apply defect verification and protection to data transmitted and received thereafter (to enhance the reliability and security of data transmitted and received from SRB1 or DRB thereafter).

[0358] 11. For all bearers (MCG terminated RBs) except SRB0, which is part of the master cell group, the updated security key and the previously configured algorithm will be applied to resume encryption and decryption procedures, and encryption and decryption will be applied to data transmitted and received thereafter (to enhance the reliability and security of data transmitted and received from SRB1 or DRB thereafter).

[0359] 12. If a terminal receives an SCG-counter value (or sk-counter) via an RRCRelease message, it applies the updated security key and the previously configured algorithm to all bearers (SCG terminated RBs) belonging to the secondary cell group, restarts the defect protection and verification procedure, and applies defect verification and protection to data transmitted and received thereafter (to enhance the reliability and security of data transmitted and received from the DRB thereafter).

[0360] 13. If a terminal receives an SCG-counter value (or sk-counter) via an RRCRelease message, it will apply the updated security key and the previously configured algorithm to all bearers (SCG terminated RBs) belonging to the secondary cell group, restart the encryption and decryption process, and apply encryption and decryption to data transmitted and received thereafter (to enhance the reliability and security of data sent and received from the DRB thereafter).

[0361] When a terminal needs to establish a connection, performs a random access procedure, transmits an RRCResumeRequest message to the base station, and then receives an RRCResume message in response, the proposed terminal actions are as follows (1j-35): If the RRCResume message contains an indicator that the terminal should report any valid frequency measurement results measured in RRC deactivation mode, the terminal will report the frequency measurement results in an RRCResumeComplete message. In addition, in an RRC message (e.g., RRCResume), the base station will transmit to the terminal an indicator or configuration information that instructs whether to discard or remove, maintain and apply, or reconfigure the SCell configuration information of the MCG or SCG stored by the terminal (e.g., the configuration information described or proposed in Figure 1F).

[0362] 1. Upon receiving a message, the terminal restores the PDCP state corresponding to the master cell group, resets the COUNT value, and re-establishes the PDCP hierarchy between SRB2, which corresponds to the master cell group, and all DRBs (MCG terminated RBs).

[0363] 2. If the terminal receives an SCG-counter value (or sk-counter) in a message, it updates the new SKgNB security key corresponding to the secondary cell group based on the KgNB security key and the SCG-counter (or sk-counter) value. Then, it uses the newly updated SKgNB security key corresponding to the secondary cell group to generate new security keys (SK_RRCenc, SK_RRC_int, SK_UPint, SK_UPenc) to be used in integrity protection, verification procedures, and encryption and decryption procedures.

[0364] 3. If the message contains master cell group configuration information,

[0365] 3-1. Execute and apply the master cell group configuration information contained in the message. The master cell group information includes configuration information related to the RLC hierarchy belonging to the master cell group, logical channel identifiers, bearer identifiers, etc.

[0366] 4. If the message contains bearer configuration information (radioBearerConfig)

[0367] 4-1. Execute and apply the bearer configuration information (radioBearerConfig) contained in the message. The bearer configuration information (radioBearerConfig) includes configuration information related to the PDCP hierarchy for each bearer, configuration information related to the SDAP hierarchy, logical channel identifier, bearer identifier, etc.

[0368] 5. If the message contains secondary cell group (masterCellgroup) configuration information,

[0369] 5-1. Execute and apply the secondary cell group configuration information contained in the message. The secondary cell group information includes configuration information related to the RLC hierarchy belonging to the secondary cell group, logical channel identifiers, bearer identifiers, etc.

[0370] 6. If the message contains secondary bearer configuration information (radioBearerConfig)

[0371] 6-1. Execute and apply the secondary bearer configuration information (radioBearerConfig) contained in the message. The secondary bearer configuration information (radioBearerConfig) includes configuration information related to the PDCP hierarchy, configuration information related to the SDAP hierarchy, logical channel identifier, bearer identifier, etc. for each secondary bearer.

[0372] 7. The terminal resumes SRB2, which corresponds to the master cell group, and all DRBs (MCG terminated RBs).

[0373] 8. If the message contains frequency measurement configuration information (measConfig)

[0374] 8-1. Execute and apply the frequency measurement setting information contained in the message. That is, perform the frequency measurement according to the settings.

[0375] 9. The terminal transitions to RRC connection mode.

[0376] 10. The terminal instructs the higher layer that the terminated RRC connection has been resumed.

[0377] 11. Then, construct and transmit the RRCResumeComplete message to the lower layer for transmission (1j-40).

[0378] If the terminal has bearer configuration information and terminal context information related to the suspended secondary cell group, it performs a frequency measurement based on system information or frequency configuration information set by an RRCRelease message or RRCResume message. If there is a valid result, it transmits an indicator in the RRCResumeComplete message to indicate that a result exists. When the base station receives the indicator, it instructs the terminal to report the frequency measurement result if carrier aggregation or dual connectivity needs to be resumed (1j-45). The terminal either reports the frequency measurement result or reports the frequency measurement result in the RRCResumeComplete message (1j-50). When the base station receives the frequency measurement result, it asks the secondary cell base station whether to resume the bearer information related to the suspended secondary cell group. After receiving the response, the base station makes a decision and transmits an RRCReconfiguration message to the terminal, instructing it to resume or release the bearer related to the secondary cell group. In addition, the base station transmits an indicator or configuration information to the terminal in the RRC message (e.g., RRCReconfiguration) that instructs the terminal whether to discard or deactivate the SCell configuration information of the MCG or SCG stored by the terminal (e.g., the configuration information described or proposed in Figure 1F), retain and apply it, or reconfigure it.

[0379] In the embodiment proposed in Figure 1J of this disclosure, the base station allows the SCell configuration information (e.g., configuration information described or proposed in Figure 1F) of an RRC message (e.g., RRCRelease, RRCResume, or RRCReconfiguration) or the PSCell (or SCell) configuration information of a cell group (e.g., a secondary cell group) to set the initial activated partial bandwidth of the partial bandwidth configuration information for the downlink or uplink of each cell to a dormant partial bandwidth, so that when a terminal activates each SCell or PSCell of a cell group (e.g., a secondary cell group), the downlink partial bandwidth or uplink partial bandwidth of each SCell or PSCell is immediately operated as a dormant partial bandwidth, or the cell group is suspended or restarted, thereby reducing terminal battery consumption. For example, each SCell or PSCell is activated, resumed, or suspended when the SCell state is set to activated, suspended, or deactivated in the SCell configuration information or cell group configuration information of an RRC message (e.g., RRCRelease, RRCResume, or RRCReconfiguration), when an instruction to suspend or resume the cell group is set, or when an instruction to activate the SCell is received in the MAC control information proposed in this disclosure. When the SCell or PSCell is activated, the downlink portion bandwidth or uplink portion bandwidth of the SCell or PSCell is immediately activated, and the dormant portion bandwidth is activated, saving battery consumption in the terminal.

[0380] Furthermore, as described above, when an RRC deactivated mode terminal transitions to RRC connected mode and recovers, applies, or reconfigures the SCell configuration information proposed in this disclosure, or the PSCell (or SCell) configuration information of a cell group (e.g., a secondary cell group), the embodiments proposed in this disclosure shall, for each activated SCell, or PSCell (or SCell) of a cell group, perform switching or activation between partial bandwidths, or activate or apply dormant partial bandwidths. The embodiments of this disclosure are also extended to apply when performing a handover.

[0381] If a terminal receives an instruction to suspend or resume, or activate or deactivate, a cell or cell group, or a cell group's PSCell, the PHY or MAC layer that receives the instruction instructs the higher layer (e.g., MAC layer, RLC layer, PDCP layer, or RRC layer) to do so. If the higher layer receives an instruction (e.g., to suspend or resume, or activate or deactivate, a cell group) from a lower layer, it performs the corresponding protocol layer procedure related to the suspension or resumption, or activation or deactivation of the cell group. Alternatively, if a terminal receives an instruction to suspend or resume, or activate or deactivate, a cell group, or a cell group's PSCell, via an RRC message, as in the embodiments of the disclosure, the RRC layer that receives the instruction instructs the lower layer (e.g., PHY layer, MAC layer, RLC layer, or PDCP layer) to do so. When a lower layer receives instructions (e.g., to suspend or resume a cell group, or to activate or deactivate a cell group) from a higher layer (e.g., the RRC layer), it executes the corresponding protocol layer procedures for suspending or resuming a cell group, or to activate or deactivate a cell group.

[0382] The embodiments proposed in this disclosure can be combined or expanded to form and operate in a variety of forms.

[0383] Figure 1K is a flowchart illustrating the signaling procedures for setting up or disabling duplex technology, or for activating, restarting, stopping, or deactivating a secondary cell group that has been set up with duplex technology, in the next-generation wireless communication system of the present disclosure.

[0384] In Figure 1K, the first signaling procedure for setting up or disabling a dual connection technique, setting up or disabling a secondary cell group configured with a dual connection technique, activating or restarting it, or suspending or deactivating it is as follows:

[0385] In Figure 1K, the terminal sets up an RRC connection to the network or base station, as shown in Figure 1F of this disclosure, and transmits or receives data with the base station (e.g., a master cell group, MN (master node), MCG (master cell group), or a cell in the master cell group (PCell or SCell)).

[0386] The base station may configure a dual connection technology for a terminal for a predetermined reason (e.g., when a high data transmission rate is required, or at the request of the terminal (1k-05), or when high QoS requirements must be met). For example, the terminal may transmit a request to the base station to configure, disable, activate, deactivate, restart, or abort a dual connection technology, cell group (e.g., secondary cell group), or cell, and the request message may include a frequency (or channel) measurement result report, cell group identifier, cell identifier, or measurement result (1k-05). Alternatively, the base station may decide to configure, disable, add, deactivate or activate, restart, modify, reconfigure, or abort a dual connection technology, cell group (e.g., secondary cell group), or cell, taking into account the amount of downlink (or uplink) data or buffer capacity.

[0387] The master base station (MN (master node) or MCG (master cell group)) receives frequency-specific or channel-specific frequency or channel measurement reports from terminals, and based on these measurement reports, determines which secondary base stations (SN (secondary node) or SCG (secondary cell group)) will configure the duplexing technology. Alternatively, the master base station may consider the downlink (or uplink) data volume or buffer volume and decide whether the base stations should configure, deconfigure, add, deactivate or reactivate, restart, modify, reconfigure, or discontinue the duplexing technology, cell group (e.g., secondary cell group), or cell. The master base station transmits a message to the determined secondary base station via the Xn interface (e.g., an interface between base stations) or Sn interface (an interface between a base station and an AMF or UMF, or an interface between base stations) requesting whether it is possible to configure, deconfigure, add, deactivate, activate, restart, modify, reconfigure, or cancel the secondary cell group of the terminal, in order to configure, deconfigure, add, deactivate, reactivate, restart, modify, reconfigure, or cancel the dual connection technology, cell group (e.g., a secondary cell group), or cell (1k-10). For secondary base stations, separate new request messages are defined and used to configure, unconfigure, add, deactivate, activate, restart, modify, reconfigure, or abort duplex technology, cell groups (e.g., secondary cell groups), or cells, or new indicators are defined in existing messages (e.g., SN addition request message, SN modification request message, or SN release request message) to instruct (or request) the configuration of cell groups (e.g., secondary cell groups) or cells, or to add, deactivate, activate, restart, modify, reconfigure, or abort them.The request message includes information such as the cell group configuration information currently set on the terminal (e.g., master cell group configuration information), bearer configuration information, terminal capability information, or terminal frequency (or channel) measurement results. When the secondary base station uses this information to configure a secondary cell group on the terminal, it configures the secondary cell group configuration information or bearer configuration information so that it matches or does not exceed the terminal capabilities, or matches the bearer configuration information of the master cell group.

[0388] If a secondary base station (SCG) receives a request message (1k-10), and rejects the request message, it constructs a rejection message and transmits it to the master base station via the Xn interface (e.g., an interface between base stations) or the Sn interface (an interface between the base station and an AMF or UMF, or an interface between base stations) (1k-15). If it accepts the request message, the secondary base station transmits an acceptance request message to the master base station via the Xn interface (e.g., an interface between base stations) or the Sn interface (an interface between the base station and an AMF or UMF, or an interface between base stations) containing configuration information or indicators for setting up, unsetting up, adding, deactivating, activating, restarting, modifying, reconfiguring, or terminating a duplexing technique, a cell group (e.g., a secondary cell group), or a cell (1k-15). The acceptance request message includes at least some of the following information:

[0389] - The same identifier as the message identifier included in the request message, or an indicator that accepts the request made in the request message.

[0390] - Configuration information or indicators (e.g., configuration information or indicators for a master cell group) for setting up, unsetting up, adding, deactivating, activating, restarting, modifying, resetting, or canceling dual connection technology, cell groups (e.g., secondary cell groups), or cells.

[0391] - A first RRC message (e.g., RRCReconfiguration message) containing configuration information or indicators for setting up, unsetting up, adding, deactivating, activating, restarting, modifying, reconfiguring, or canceling dual connection technology, cell groups (e.g., secondary cell groups), or cells.

[0392] -The first RRC message will include at least some of the following information:

[0393] --A first RRC message identifier (e.g., rrc-transaction identifier) ​​to distinguish the first RRC message. Terminals and base stations (e.g., secondary base stations) send or receive several RRC messages from each other, and each RRC message contains an identifier to distinguish it. For example, an RRC message transmitted by the transmitting end (e.g., RRCReconfiguration), an RRC message transmitted by the receiving end (e.g., RRCReconfigurationComplete) corresponding to RRCReconfiguration, or an RRC message transmitted by the transmitting end corresponding to RRC message all contain the same first RRC message identifier.

[0394] --Configuration information or indicators (e.g., configuration information or indicators for terminals) to set up, unset up, add, deactivate, activate, restart, modify, reconfigure, or cancel dual connection technology, cell groups (e.g., secondary cell groups), or cells.

[0395] -- An indicator that specifies the state of a cell group (e.g., activate, deactivate, stop, or resume)

[0396] --Cell group identifiers to distinguish cell groups (The cell group identifier is assigned by the master base station, or one of the previously agreed-upon identifiers is assigned by the secondary base station.)

[0397] --Cell group settings information or cell settings information

[0398] -- Bearer configuration information. For example, indicator information that instructs the operation of each bearer's protocol layer (e.g., SDAP layer, PDCP layer, RLC layer, or MAC layer) (e.g., PDCP abort indicator, PDCP re-establish indicator, PDCP data recovery indicator, RLC re-establish indicator, MAC partial initialization indicator, MAC initialization indicator, or indicators that trigger new operations).

[0399] --If the configuration information or indicators include configuration information or indicators for setting up, adding, activating, restarting, changing, or reconfiguring a dual connection technique, cell group (e.g., secondary cell group), or cell, then the first indicator (e.g., mobilityControlInfor or ReconfigurationWithSync) is included. However, if the configuration information or indicators include configuration information or indicators for unlinking, deactivating, reconfiguring, or terminating a dual connection technique, cell group (e.g., secondary cell group), or cell, then the first indicator (e.g., mobilityControlInfor or ReconfigurationWithSync) is not included. The first indicator is an indicator that triggers a random access procedure in a cell group or cell, or an indicator that synchronizes signals with a new cell, or an indicator that instructs a frequency shift of a terminal, or an indicator that instructs a change in a cell group (or cell).

[0400] --If configuration information or indicators are included for setting up, adding, activating, restarting, modifying, or resetting a dual connection technique, cell group (e.g., secondary cell group), or cell, then random access configuration information is also included. However, if configuration information or indicators are included for disconnecting, deactivating, resetting, or canceling a dual connection technique, cell group (e.g., secondary cell group), or cell, then random access configuration information is not included. Random access configuration information includes random access transmission resource information (time transmission resources or frequency transmission resources) for preamble transmission related to a cell group or cell, or specified preamble information.

[0401] --Dual connection technology, time information that instructs when to activate, restart, deactivate, or abort a cell group (e.g., secondary cell group) or cell (PSCell or SCGSCell) (e.g., timing information (e.g., X), time units, subframes, time slots, or symbol units), for example, if a message is received in the nth time unit, time information that instructs when to activate, restart, deactivate, or abort the cell at the (n+X)th time unit).

[0402] --First channel measurement settings information by cell or by partial bandwidth

[0403] -- Second channel measurement settings information by cell or by partial bandwidth

[0404] -- Indicators that add cell group settings, or indicators that instruct a change in cell group (ReconfigurationWithSync), or indicators that instruct a random access procedure (ReconfigurationWithSync, or newly defined indicators)

[0405] -- An indicator (ReconfigurationWithSync, or a newly defined indicator) that specifies whether to perform a random access procedure to activate the cell group when activating the cell group, or to activate the cell group without a random access procedure.

[0406] --RRM (radio resource management) setting information, frequency measurement setting information, additional RRM (radio resource management) setting information that must be applied or performed when a cell group is deactivated, or frequency measurement setting information (e.g., simplified frequency measurement setting information for battery saving (reduced or relaxed RRM setting information)).

[0407] --Configuration information for RLM (radio link monitoring), or configuration information for RLM that must be applied or performed when a cell group is deactivated. For example, configuration information for RLM, or configuration information for RLM that must be applied or performed when a cell group is deactivated, includes cell-level beam configuration information that the terminal must measure when a cell group is deactivated, or beam configuration information for each partial bandwidth, and includes beam-related configuration information (TCI (transmission configuration indication) state or QCL (quasi co-location)). Alternatively, configuration information for RLM, or configuration information for RLM that must be applied or performed when a cell group is deactivated, includes a TA (timing advance) value (or offset value) for synchronizing the base station's downlink signal or the base station's uplink signal, a timer (TAT: time alignment timer) indicating the validity of the TA value, or a timer value (TAT value). Alternatively, the configuration information for RLM, or the configuration information for RLM that must be applied or performed when a cell group is deactivated, includes the SSB (synchronization signal block) configuration information, CSI-RS (channel state information reference signal) configuration information, RS (reference signal) configuration information, and transmission resource information to report results in the event of a beam failure (e.g., PUCCH configuration information (e.g., SR (scheduling request) information or specific transmission resource), or frequency transmission resource or time transmission resource). The configuration information also includes partial bandwidth configuration information (e.g., indicated by a partial bandwidth identifier) ​​that indicates in which partial bandwidth the RLM procedure should be performed.Alternatively, when the cell group state is inactive, the terminal performs the RLM procedure on the first activated partial bandwidth (or the first activated downward link partial bandwidth (firstActiveDownlinkBWP-ID)) set by the RRC message, and when activating the cell group, monitors the first activated partial bandwidth that must be activated as soon as possible to minimize the cell group activation delay. Alternatively, when the cell group state is set to inactive (or activated), the terminal performs the RLM procedure on the partial bandwidth that was last (or previously) activated before the cell group state was deactivated, and continues to maintain the connection state with the cell group (e.g., if partial bandwidth setting information indicating which partial bandwidth to perform the RLM procedure on is not set), or when activating the cell group, performs the activation procedure on the first activated partial bandwidth (or the first activated downward link partial bandwidth (firstActiveDownlinkBWP-ID)) set by the RRC message. If, when activating a cell group, partial bandwidth-related configuration information indicating which partial bandwidth should be used for the RLM procedure is not set, the terminal will perform the RLM procedure on the last (or previously) activated partial bandwidth. The configuration information also includes beam-related configuration information (e.g., indicated by a partial bandwidth identifier, TCI state, or QCL configuration information) indicating which beam should be used for the RLM procedure. Alternatively, when the cell group state is inactive, the terminal will either perform the RLM procedure on the beam configured by the RRC message (e.g., TCI state or QCL configuration information), or minimize the cell group activation delay by early monitoring of the beam that needs to be activated when activating a beam, performing the RLM procedure, and activating the cell group.Alternatively, if the cell group state is set to deactivated (or activated), the terminal will perform the RLM procedure on the beam that was last (or previously) activated before the cell group state was deactivated, and will continue to maintain the connection with the cell group (e.g., if beam-related configuration information indicating which beam to perform the RLM procedure on is not set), or, when activating the cell group, will perform the activation procedure on the beam set by the RRC message. If, when activating the cell group, beam-related configuration information indicating which beam to perform the RLM procedure on is not set, the terminal will perform the RLM procedure on the beam that was last (or previously) activated.

[0408] -- Beam failure detection procedures, configuration information for BFD (beam failure detection), or configuration information for BFD that must be applied or performed when a cell group is deactivated. For example, beam failure detection procedures, configuration information for BFD, or configuration information for BFD that must be applied or performed when a cell group is deactivated are cell-level beam configuration information that the terminal must measure when a cell group is deactivated, or beam configuration information for each partial bandwidth, and include beam-related configuration information (TCI (transmission configuration indication) state or QCL (quasi co-location)). Alternatively, beam failure detection procedures, configuration information for BFD, or configuration information for BFD that must be applied or performed when a cell group is deactivated include a TA (timing advance) value (or offset value) for synchronizing the base station's downlink signal or the base station's uplink signal, a timer (TAT: time alignment timer) indicating the validity of the TA value, or a timer value (TAT value). Alternatively, the beam failure detection procedure, the configuration information for BFD, or the configuration information for BFD that must be applied or performed when a cell group is deactivated, includes the SSB (synchronization signal block) configuration information, CSI-RS (channel state information reference signal) configuration information, RS (reference signal) configuration information, and transmission resource information (e.g., PUCCH configuration information (e.g., SR (scheduling request) information or specific transmission resources), or frequency transmission resources or time transmission resources) to which results can be reported if a beam failure occurs. The configuration information also includes partial bandwidth configuration information (e.g., which may be indicated by a partial bandwidth identifier) ​​that indicates which partial bandwidth the beam failure detection procedure should be performed in.Alternatively, when the cell group state is inactive, the terminal performs the beam failure detection procedure on the first activated partial bandwidth (or the first activated downlink partial bandwidth (firstActiveDownlinkBWP-ID)) set by the RRC message, and when activating the cell group, monitors the first activated partial bandwidth that must be activated as early as possible to minimize the cell group activation delay. Alternatively, when the cell group state is set to inactive (or activated), the terminal performs the beam failure detection procedure on the partial bandwidth that was last (or previously) activated before the cell group state was deactivated, and continues to maintain the connection state with the cell group (e.g., if partial bandwidth setting information indicating which partial bandwidth to perform the beam failure detection procedure on is not set), or when activating the cell group, performs the activation procedure on the first activated partial bandwidth (or the first activated downlink partial bandwidth (firstActiveDownlinkBWP-ID)) set by the RRC message. If, when activating a cell group, partial bandwidth-related configuration information indicating which partial bandwidth to use for beam failure detection procedures is not set, the terminal will perform beam failure detection procedures on the last (or previously) activated partial bandwidth. The configuration information also includes beam-related configuration information (e.g., indicated by a partial bandwidth identifier, TCI state, or QCL configuration information) indicating which beam to use for beam failure detection procedures. Alternatively, when the cell group state is inactive, the terminal will perform beam failure detection procedures on the beam configured by the RRC message (e.g., TCI state or QCL configuration information), minimizing cell group activation delay by monitoring the beam that needs to be activated earlier when activating the cell group.Alternatively, if the cell group state is set to deactivated (or activated), the terminal will perform the beam failure detection procedure on the beam that was last (or previously) activated before the cell group state was deactivated, and will continue to maintain the connection with the cell group (e.g., if beam-related configuration information indicating which beam to perform the beam failure detection procedure on is not set), or, when activating the cell group, will perform the activation procedure on the beam set by the RRC message. If, when activating the cell group, beam-related configuration information indicating which beam to perform the beam failure detection procedure on is not set, the terminal will perform the beam failure detection procedure on the beam that was last (or previously) activated.

[0409] --SDAP hierarchical configuration information (sdap-config): SDAP hierarchical configuration information is configured for each bearer and includes the following information. SDAP hierarchical configuration information is configuration information that determines how QoS flow is mapped to the bearer (DRB) when an NR base station or E-UTRA base station is connected to 5GC (5G core), or whether or not an uplink (or downlink) SDAP header is present.

[0410] ---PDU Session Identifier (pdu-Session): The PDU session identifier indicates the PDU session of the QoS flow mapped to the bearer.

[0411] ---Indicator indicating the presence or absence of a downward link SDAP header (sdap-HeaderDL): Indicates whether or not an SDAP header exists for the bearer's downward link data. The indicator value for the presence or absence of a downward link SDAP header is not changed after the bearer is established.

[0412] ---Indicator indicating the presence or absence of an upward link SDAP header (sdap-HeaderUL): This indicator indicates whether or not an SDAP header exists for the bearer's upward link data. When the bearer is set as the default bearer, the network sets the indicator indicating the presence or absence of an upward link SDAP header to indicate that an SDAP header exists for the upward link data.

[0413] ---Default Bearer Indicator (default DRB): This indicates whether the configured bearer (or DRB) is the default bearer for that PDU session. The default bearer indicator value is set to TRUE for only one bearer (or instance) belonging to the same PDU session (or having the same PDU session identifier value), and set to FALSE for the remaining bearers. In other words, only one default bearer is configured for a single PDU session.

[0414] ---Configuration information to add QoS flow mapping information (mappedQoS-FlowsToAdd): Specifies a list of QFI identifiers (QFI: QoS flow identifier) ​​for the upward link QoS flow of the PDU session to be added and mapped to the bearer. A single QFI identifier value is included and set only once in the SDAP hierarchical configuration information that has a PDU session identifier value among all the SDAP hierarchical configuration information set on the terminal. When configuring QoS flow remapping, the QFI identifier of the QoS flow to be remapping is included and set only in the configuration information to add QoS flow mapping information to the SDAP hierarchical configuration information corresponding to the new bearer (or the newly mapped bearer) (mappedQoS-FlowsToAdd), and is not included in the configuration information to release QoS flow mapping information corresponding to the old bearer (or the previously mapped bearer) (mappedQoS-FlowsToRelease).

[0415] ---Configuration information to release QoS flow mapping information (mappedQoS-FlowsToRelease): Specifies a list of QFI identifiers (QFI: QoS flow identifier) ​​for the QoS flows of PDU sessions to be released from the existing QoS flows that are bearer-mapped to the bearer.

[0416] When the Master Center Group (MCG) receives a request acceptance message (1k-15), it confirms the request acceptance message and transmits a second RRC message (e.g., RRCReconfiguration) containing the information contained in the request acceptance message (e.g., the first RRC message contained in the request acceptance message (1k-15)) to the terminal (1k-20). The second RRC message contains at least some of the following information:

[0417] - A second RRC message identifier (e.g., rrc-transaction identifier) ​​to distinguish second RRC messages. Terminals and base stations (e.g., master base stations) send or receive several RRC messages from each other, and each RRC message contains an identifier to distinguish it. For example, an RRC message transmitted by the transmitting end (e.g., RRCReconfiguration), or an RRC message corresponding to an RRC message transmitted by the receiving end (e.g., RRCReconfigurationComplete), or an RRC message corresponding to an RRC message transmitted by the transmitting end, will contain the same second RRC message identifier.

[0418] - The first RRC message included in the request acceptance message (1k-15)

[0419] - Configuration information or indicators (e.g., configuration information or indicators for terminals) for setting up, unsetting up, adding, deactivating, activating, restarting, modifying, reconfiguring, or canceling dual connection technology, cell groups (e.g., secondary cell groups), or cells.

[0420] - Indicators that indicate the state of a cell group (e.g., activate, deactivate, stop, or resume)

[0421] - A cell group identifier used to distinguish cell groups. The cell group identifier is assigned by the master base station, or one of the previously agreed-upon identifiers is assigned by the secondary base station.

[0422] - Cell group settings information or cell settings information

[0423] - Bearer configuration information. For example, indicator information that instructs the operation of each bearer's protocol layer (e.g., SDAP layer, PDCP layer, RLC layer, or MAC layer) (e.g., PDCP abort indicator, PDCP re-establish indicator, PDCP data recovery indicator, RLC re-establish indicator, MAC partial initialization indicator, MAC initialization indicator, or indicators that trigger new operations).

[0424] -If configuration information or indicators are included for setting up, adding, activating, restarting, changing, or reconfiguring a dual connection technique, cell group (e.g., secondary cell group), or cell, then a first indicator (e.g., mobilityControlInfor or ReconfigurationWithSync) is also included. However, if configuration information or indicators are included for disconnecting, deactivating, reconfiguring, or aborting a dual connection technique, cell group (e.g., secondary cell group), or cell, then the first indicator (e.g., mobilityControlInfor or ReconfigurationWithSync) is not included. The first indicator is an indicator that triggers a random access procedure in a cell group or cell, or an indicator that synchronizes signals with a new cell, or an indicator that instructs a frequency shift of the terminal, or an indicator that instructs a change in a cell group (or cell). Alternatively, the terminal may perform PDCCH monitoring in the indicated or configured cell group or cell and trigger and perform random access procedures as instructed by the PDCCH. For example, a higher layer (e.g., the RRC layer) transmits an indicator to a lower layer (e.g., the MAC layer) that triggers a random access procedure.

[0425] -If configuration information or indicators are included for setting up, adding, activating, restarting, modifying, or resetting a dual connection technique, cell group (e.g., secondary cell group), or cell, then random access configuration information is also included. However, if configuration information or indicators are included for disconnecting, deactivating, resetting, or canceling a dual connection technique, cell group (e.g., secondary cell group), or cell, then random access configuration information is not included. Random access configuration information includes random access transmission resource information (time transmission resources or frequency transmission resources) for preamble transmission related to a cell group or cell, or specified preamble information.

[0426] - Dual connection technology, time information that instructs when to activate, restart, deactivate, or abort a cell group (e.g., secondary cell group) or cell (PSCell or SCGSCell) (e.g., timing information (e.g., X), time units, subframes, time slots, or symbol units), for example, if a message is received in the nth time unit, time information that instructs when to activate, restart, deactivate, or abort the cell at the (n+X)th time unit).

[0427] - First channel measurement settings information by cell or by partial bandwidth

[0428] - Second channel measurement settings information by cell or by partial bandwidth

[0429] - Indicators that add cell group settings, or indicators that instruct a change in cell group (ReconfigurationWithSync), or indicators that instruct a random access procedure (ReconfigurationWithSync, or newly defined indicators)

[0430] - An indicator (ReconfigurationWithSync, or a newly defined indicator) that specifies whether to perform a random access procedure to activate the cell group when activating the cell group, or to activate the cell group without a random access procedure.

[0431] - RRM (radio resource management) setting information, frequency measurement setting information, additional RRM (radio resource management) setting information that must be applied or performed when a cell group is deactivated, or frequency measurement setting information (e.g., simplified frequency measurement setting information for battery saving (reduced or relaxed RRM setting information)).

[0432] - Configuration information for RLM (radio link monitoring), or configuration information for RLM that must be applied or performed when a cell group is deactivated. For example, configuration information for RLM, or configuration information for RLM that must be applied or performed when a cell group is deactivated, includes cell-level beam configuration information that the terminal must measure when a cell group is deactivated, or beam configuration information for each partial bandwidth, and includes beam-related configuration information (TCI (transmission configuration indication) state or QCL (quasi co-location)). Alternatively, configuration information for RLM, or configuration information for RLM that must be applied or performed when a cell group is deactivated, includes a TA (timing advance) value (or offset value) for synchronizing the base station's downlink signal or the base station's uplink signal, a timer (TAT: time alignment timer) indicating the validity of the TA value, or a timer value (TAT value). Alternatively, the configuration information for RLM, or the configuration information for RLM that must be applied or performed when a cell group is deactivated, includes the SSB (synchronization signal block) configuration information, CSI-RS (channel state information reference signal) configuration information, RS (reference signal) configuration information, and transmission resource information to report results in the event of a beam failure (e.g., PUCCH configuration information (e.g., SR (scheduling request) information or specific transmission resource), or frequency transmission resource or time transmission resource). The configuration information also includes partial bandwidth configuration information (e.g., indicated by a partial bandwidth identifier) ​​that indicates in which partial bandwidth the RLM procedure should be performed.Alternatively, when the cell group state is inactive, the terminal performs the RLM procedure on the first activated partial bandwidth (or the first activated downlink partial bandwidth (firstActiveDownlinkBWP-ID)) set by the RRC message, and when activating the cell group, monitors the first activated partial bandwidth that must be activated as early as possible to minimize the cell group activation delay. Alternatively, when the cell group state is set to inactive (or activated), the terminal performs the RLM procedure on the partial bandwidth that was last (or previously) activated before the cell group state was deactivated, and continues to maintain the connection state with the cell group (e.g., if partial bandwidth setting information indicating which partial bandwidth to perform the RLM procedure on is not set), or when activating the cell group, performs the activation procedure on the first activated partial bandwidth (or the first activated downlink partial bandwidth (firstActiveDownlinkBWP-ID)) set by the RRC message. If, when activating a cell group, partial bandwidth-related configuration information indicating which partial bandwidth should be used for the RLM procedure is not set, the terminal will perform the RLM procedure on the last (or previously) activated partial bandwidth. The configuration information also includes beam-related configuration information (e.g., indicated by a partial bandwidth identifier, TCI state, or QCL configuration information) indicating which beam should be used for the RLM procedure. Alternatively, when the cell group state is inactive, the terminal will either perform the RLM procedure on the beam configured by the RRC message (e.g., TCI state or QCL configuration information), or minimize the cell group activation delay by early monitoring of the beam that needs to be activated when activating a beam, performing the RLM procedure, and activating the cell group.Alternatively, if the cell group state is set to deactivated (or activated), the terminal will perform the RLM procedure on the beam that was last (or previously) activated before the cell group state was deactivated, and will continue to maintain the connection with the cell group (e.g., if beam-related configuration information indicating which beam to perform the RLM procedure on is not set), or, when activating the cell group, will perform the activation procedure on the beam set by the RRC message. If, when activating the cell group, beam-related configuration information indicating which beam to perform the RLM procedure on is not set, the terminal will perform the RLM procedure on the beam that was last (or previously) activated.

[0433] - Beam failure detection procedures, configuration information for BFD (beam failure detection), or configuration information for BFD that must be applied or performed when a cell group is deactivated. For example, beam failure detection procedures, configuration information for BFD, or configuration information for BFD that must be applied or performed when a cell group is deactivated is cell-level beam configuration information that the terminal must measure when a cell group is deactivated, or beam configuration information for each partial bandwidth, and includes beam-related configuration information (TCI (transmission configuration indication) state or QCL (quasi co-location)). Alternatively, beam failure detection procedures, configuration information for BFD, or configuration information for BFD that must be applied or performed when a cell group is deactivated includes a TA (timing advance) value (or offset value) for synchronizing the base station's downlink signal or the base station's uplink signal, a timer (TAT: time alignment timer) indicating the validity of the TA value, or a timer value (TAT value). Alternatively, the beam failure detection procedure, the configuration information for BFD, or the configuration information for BFD that must be applied or performed when a cell group is deactivated, includes the SSB (synchronization signal block) configuration information, CSI-RS (channel state information reference signal) configuration information, RS (reference signal) configuration information, and transmission resource information (e.g., PUCCH configuration information (e.g., SR (scheduling request) information or specific transmission resources), or frequency transmission resources or time transmission resources) to which results can be reported if a beam failure occurs. The configuration information also includes partial bandwidth configuration information (e.g., which may be indicated by a partial bandwidth identifier) ​​that indicates which partial bandwidth the beam failure detection procedure should be performed in.Alternatively, when the cell group state is inactive, the terminal performs the beam failure detection procedure on the first activated partial bandwidth (or the first activated downlink partial bandwidth (firstActiveDownlinkBWP-ID)) set by the RRC message, and when activating the cell group, monitors the first activated partial bandwidth that must be activated as early as possible to minimize the cell group activation delay. Alternatively, when the cell group state is set to inactive (or activated), the terminal performs the beam failure detection procedure on the partial bandwidth that was last (or previously) activated before the cell group state was deactivated, and continues to maintain the connection state with the cell group (e.g., if partial bandwidth setting information indicating which partial bandwidth to perform the beam failure detection procedure on is not set), or when activating the cell group, performs the activation procedure on the first activated partial bandwidth (or the first activated downlink partial bandwidth (firstActiveDownlinkBWP-ID)) set by the RRC message. If, when activating a cell group, partial bandwidth-related configuration information specifying which partial bandwidth to use for beam failure detection procedures is not configured, the terminal will perform the beam failure detection procedure on the last (or previously) activated partial bandwidth. The configuration information also includes beam-related configuration information (e.g., indicated by a partial bandwidth identifier, TCI state, or QCL configuration information) specifying which beam to use for beam failure detection procedures. Alternatively, when the cell group state is inactive, the terminal will perform the beam failure detection procedure on the beam configured by the RRC message (e.g., TCI state or QCL configuration information), minimizing cell group activation delay by monitoring the beam that needs to be activated earlier when activating the cell group.Alternatively, if the cell group state is set to deactivated (or activated), the terminal will perform the beam failure detection procedure on the beam that was last (or previously) activated before the cell group state was deactivated, and will continue to maintain the connection with the cell group (e.g., if beam-related configuration information indicating which beam to perform the beam failure detection procedure on is not set), or, when activating the cell group, will perform the activation procedure on the beam set by the RRC message. If, when activating the cell group, beam-related configuration information indicating which beam to perform the beam failure detection procedure on is not set, the terminal will perform the beam failure detection procedure on the beam that was last (or previously) activated.

[0434] -SDAP hierarchical configuration information (sdap-config): SDAP hierarchical configuration information is configured for each bearer and includes the following information. SDAP hierarchical configuration information is configuration information that determines how QoS flow is mapped to the bearer (DRB) when an NR base station or E-UTRA base station is connected to 5GC (5G core), or whether or not an uplink (or downlink) SDAP header is present.

[0435] --PDU Session Identifier (pdu-Session): The PDU session identifier indicates the PDU session of the QoS flow mapped to the bearer.

[0436] -- Indicator indicating the presence or absence of a downward link SDAP header (sdap-HeaderDL): Indicates whether or not an SDAP header exists for the bearer's downward link data. The indicator value for the presence or absence of a downward link SDAP header is not changed after the bearer is established.

[0437] --Indicator indicating the presence or absence of an upward link SDAP header (sdap-HeaderUL): This indicator indicates whether or not an SDAP header exists for the bearer's upward link data. When the bearer is set as the default bearer, the network sets the indicator indicating the presence or absence of an upward link SDAP header to indicate that an SDAP header exists for the upward link data.

[0438] -- Default Bearer Indicator (default DRB): Indicates whether the configured bearer (or DRB) is the default bearer for that PDU session. The default bearer indicator value is set to TRUE for only one bearer (or instance) belonging to the same PDU session (or having the same PDU session identifier value), and to FALSE for the remaining bearers. In other words, only one default bearer is configured for a single PDU session.

[0439] --Configuration information to add QoS flow mapping information (mappedQoS-FlowsToAdd): Specifies a list of QFI identifiers (QFI: QoS flow identifier) ​​for the upward link QoS flow of the PDU session to be added and mapped to the bearer. A single QFI identifier value is included and set only once in the SDAP hierarchy configuration information that has a PDU session identifier value among all the SDAP hierarchy configuration information set on the terminal. When configuring QoS flow remapping, the QFI identifier of the QoS flow to be remapped is included and set only in the configuration information to add QoS flow mapping information to the SDAP hierarchy configuration information corresponding to the new bearer (or the newly mapped bearer) (mappedQoS-FlowsToAdd), and is not included in the configuration information to release QoS flow mapping information corresponding to the old bearer (or the previously mapped bearer) (mappedQoS-FlowsToRelease).

[0440] --Configuration information to release QoS flow mapping information (mappedQoS-FlowsToRelease): Specifies a list of QFI identifiers (QFI: QoS flow identifier) ​​for the QoS flows of PDU sessions to be released from existing QoS flows that are bearer-mapped to the bearer.

[0441] If the terminal receives a second RRC message (1k-20), it reads and verifies the second RRC message, or reads the information contained in the second RRC message (e.g., the first RRC message contained in the second RRC message), and then the terminal sets up, adds, modifies, restarts, cancels, or deactivates the duplexing technique or cell group (e.g., a secondary cell group). Also, if the second or first RRC message contains a first indicator that triggers a random access procedure, the terminal triggers a random access procedure for the set up or indicated cell group or cell. When performing a random access procedure, if the RRC message contains random access information, or if there is stored random access information, the terminal performs the random access procedure (e.g., a non-competitive random access procedure (e.g., 4-step random access or 2-step random access)) based on the stored random access information or the random access information received in the RRC message, or based on system information. If there is no random access information in the RRC message, the terminal performs a random access procedure (e.g., a competitive random access procedure (e.g., 4-step random access or 2-step random access)). Alternatively, the terminal performs PDCCH monitoring in the instructed or configured cell group or cell, and triggers and performs the random access procedure as instructed by the PDCCH. For example, a higher layer (e.g., the RRC layer) transmits an indicator to a lower layer (e.g., the MAC layer) to trigger a random access procedure.

[0442] In Figure 1K, 1k-40 illustrates the problems that may occur at a terminal when a first or second RRC message is transmitted to the terminal containing configuration information to deactivate the terminal's cell group (or secondary cell group) (e.g., setting the cell group state to deactivated), and also containing configuration information for the SDAP hierarchy that configures QoS flow remapping. Problems may also occur when the base station sets the RDI (Reflective QoS flow to DRB mapping Indication) or RQI (Reflective QoS indication) value in the SDAP header of the downlink data for the deactivated (or deactivated) cell group (e.g., setting it to 1) to instruct reflective mapping and configure QoS flow remapping.

[0443] In 1k-40, if a terminal configured with dual connectivity technology receives a first or second RRC message containing configuration information to deactivate a cell group (or secondary cell group) (e.g., setting the cell group's status to deactivated), the terminal will perform the procedure to deactivate the cell group. The terminal will no longer be able to transmit or receive data for the deactivated cell group (or through the bearer of the deactivated cell group). Furthermore, if the first or second RRC message contains configuration information to deactivate the terminal's cell group (or secondary cell group) (e.g., setting the cell group's status to deactivated) and also contains configuration information for the SDAP hierarchy to configure QoS flow remapping for the deactivated cell group, the terminal will perform QoS flow remapping for the deactivated cell group. For example, when the configuration information for adding QoS flow mapping information in SDAP hierarchy settings (mappedQoS-FlowsToAdd) specifies a list relating to the QFI identifier (QFI: QoS flow identifier) ​​of an upward link QoS flow of a PDU session to be added and mapped to a new bearer (or a newly mapped bearer (1k-80)), it includes the QFI identifier (1k-45) of the QoS flow to be remapped for QoS flow remapping (1k-50). That is, the first QoS flow (1k-45) (QoS flow 3), which was mapped to the first bearer (1k-70) (previously an old DRB) belonging to the deactivated cell group (SCG), is remapped (1k-50) in the second bearer (1k-80) (new DRB) of the activated cell group (MCG).QoS flow remapping (1k-50) is performed when the base station has the RDI (Reflective QoS flow to DRB mapping Indication) or RQI (Reflective QoS indication) value set in the SDAP header of the downlink data (e.g., set to 1), and is instructed to perform reflective mapping.

[0444] As explained, if QoS flow remapping (1k-50) is configured on the terminal, the SDAP layer generates an end marker (1k-55) containing a QFI corresponding to the QoS flow (1k-45) (QoS flow 3) which is remapped to SDAP control data (SDAP control PDU) to prevent out-of-order delivery at the receiving end caused by QoS flow remapping, and transmits it to the first bearer (1k-70) (formerly DRB (old DRB)). However, as explained, the terminal is unable to send or receive data for (or through the bearer of) a deactivated cell group, but a problem arises if an end marker is generated and must be transmitted through the bearer of the deactivated cell group. For example, the generation of an end marker may cause a terminal to unnecessarily request the base station to reactivate a cell group that the base station has instructed to deactivate, or unnecessary signaling may occur (e.g., a terminal requesting the cell group to be reactivated, an activation instruction RRC message from the base station instructing reactivation, or a deactivation instruction RRC message from the base station instructing reactivation). Alternatively, an end marker may not be transmitted because the cell group has been deactivated.

[0445] Accordingly, the following disclosure proposes methods for resolving problems that may arise when QoS flow remapping is configured or instructed for a cell group to be deactivated. One or more of the following methods may be applied, or a combination of multiple methods may be applied to create a new method.

[0446] -Method 1: If QoS flow remapping is required for a terminal (or to be configured) or for a bearer belonging to a cell group to be deactivated, the NR base station or E-UTRA base station connected to 5GC shall configure QoS flow remapping (e.g., QoS flow remapping by including SDAP hierarchy configuration information in the RRC message and transmitting it to the terminal, or QoS flow remapping via reflective mapping by setting the RDI field or RQI field in the SDAP header) on the terminal before deactivating the cell group (e.g., SCG) (or before transmitting an RRC message containing an indicator to deactivate the cell group). In other words, if QoS flow remapping is required for a terminal (or to be configured) or for a bearer belonging to a cell group to be deactivated, the instruction or setting to deactivate the cell group shall not be set together in the RRC message (e.g., QoS flow remapping cannot be set or is not allowed for the cell group to be deactivated or for bearers belonging to the cell group).

[0447] According to one embodiment, an NR base station or E-UTRA base station connected to a 5GC restricts the SDAP hierarchy configuration information (PDU session identifier, indicator indicating the presence or absence of a downlink SDAP header (sdap-HeaderDL), indicator indicating the presence or absence of an uplink SDAP header (sdap-HeaderUL), indicator indicating the default bearer (default DRB), configuration information to add QoS flow mapping information (mappedQoS-FlowsToAdd), or configuration information to release QoS flow mapping information (mappedQoS-FlowsToRelease)) or the RDI field (or RQI field) setting of the SDAP header (e.g., set to 1) to not exist, not be included, not be set, or not be QoS flow remapping if the RRC message (e.g., RRCReconfiguration) contains an indicator that deactivates a cell group (or sets the state of the cell group to deactivate).

[0448] According to one embodiment, an NR base station or E-UTRA base station connected to a 5GC ensures that, if the RRC message (e.g., RRCReconfiguration) does not contain an indicator to deactivate the cell group (or does not set the cell group state to deactivate), the following are present, included, set, or QoS flow remapped: SDAP hierarchical configuration information (PDU session identifier, indicator indicating the presence or absence of a downlink SDAP header (sdap-HeaderDL), indicator indicating the presence or absence of an uplink SDAP header (sdap-HeaderUL), indicator indicating a default bearer (default DRB), configuration information to add QoS flow mapping information (mappedQoS-FlowsToAdd), or configuration information to release QoS flow mapping information (mappedQoS-FlowsToRelease)), or an RDI field (or RQI field) setting in the SDAP header (e.g., set to 1).

[0449] According to one embodiment, an NR base station or E-UTRA base station connected to a 5GC restricts RRC messages (e.g., RRCReconfiguration) to not include indicators that deactivate a cell group (or to not set the cell group state to deactivate) if SDAP hierarchical configuration information (PDU session identifier, indicator indicating the presence or absence of a downlink SDAP header (sdap-HeaderDL), indicator indicating the presence or absence of an uplink SDAP header (sdap-HeaderUL), indicator indicating a default bearer (default DRB), configuration information to add QoS flow mapping information (mappedQoS-FlowsToAdd), configuration information to release QoS flow mapping information (mappedQoS-FlowsToRelease), or an RDI field (or RQI field) setting in the SDAP header (e.g., set to 1) exists, is included, is set, or QoS flow remapping is configured.

[0450] According to one embodiment, if an NR base station or E-UTRA base station connected to a 5GC does not have SDAP hierarchical configuration information (PDU session identifier, indicator indicating the presence or absence of a downlink SDAP header (sdap-HeaderDL), indicator indicating the presence or absence of an uplink SDAP header (sdap-HeaderUL), indicator indicating the default bearer (default DRB), configuration information to add QoS flow mapping information (mappedQoS-FlowsToAdd), configuration information to release QoS flow mapping information (mappedQoS-FlowsToRelease), or an RDI field (or RQI field) setting in the SDAP header (e.g., set to 1), the RRC message (e.g., RRCReconfiguration) will include an indicator to deactivate the cell group (or set the cell group state to deactivate).

[0451] -Second method: If a terminal requires (or configures) QoS flow remapping, or if QoS flow remapping is required for bearers belonging to a cell group to be deactivated, even if an NR base station or E-UTRA base station connected to 5GC deactivates the cell group (e.g., SCG) (or transmits an RRC message containing an indicator to deactivate the cell group) and configures QoS flow remapping (e.g., includes SDAP hierarchy configuration information in the RRC message, transmits it to the terminal, configures QoS flow remapping or the RDI or RQI field of the SDAP header, and performs QoS flow remapping via reflective mapping) on ​​the terminal, the terminal's SDAP hierarchy will not generate an end marker for bearers in the cell group deactivated by the first condition. That is, the terminal's SDAP hierarchy will generate an end marker for bearers when performing QoS flow remapping for bearers that do not belong to the cell group deactivated by the first condition, or if the cell group to which the bearer belongs is not deactivated.The first condition also includes the condition that when QoS flow remapping (upbound link QoS flow and bearer mapping) is set for any QoS flow (or when the RDI field (or RQI field) of the downbound link SDAP header of the received data is set to 1), an SDAP hierarchy has already been established, there is no stored QoS flow and bearer mapping for that QoS flow, a default bearer has been set, or the cell group to which the QoS flow (or bearer) belongs is not deactivated, an end marker is generated and transmitted to the default bearer, or the first condition also includes the condition that when QoS flow remapping (upbound link QoS flow and bearer mapping) is set for any QoS flow (or when the RDI field (or RQI field) of the downbound link SDAP header of the received data is set to 1), the stored QoS flow and bearer mapping for that QoS flow is different from the QoS flow and bearer mapping newly set by the RRC message, an upbound link SDAP header exists, or QoS The condition includes generating an end marker and transmitting it to the bearer corresponding to the previously stored QoS flow and bearer mapping if the cell group to which the flow (or bearer) belongs is not deactivated.

[0452] Furthermore, in the SDAP hierarchy configuration information, the default bearer is used as the bearer that transmits data related to upward link QoS flows for which there is no (or is not configured) mapping between the QoS flow and the bearer. Therefore, if the default bearer is configured as a bearer belonging to a deactivated cell group, it will either be unable to transmit data or will perform a procedure to unnecessarily activate the cell group.

[0453] Accordingly, this disclosure proposes restricting the setting of a default bearer configured as SDAP hierarchical configuration information to prevent it from being configured as a bearer belonging to a deactivated cell group. Alternatively, it is proposed that the default bearer configured as SDAP hierarchical configuration information be configured as a bearer belonging to a cell group that is not deactivated. Alternatively, an NR base station or E-UTRA base station connected to a 5GC transmits another RRC message containing SDAP hierarchical configuration information to a terminal before transmitting an RRC message to deactivate a cell group to the terminal, thereby changing or resetting the default bearer to a bearer belonging to a cell group that is not deactivated. Alternatively, an NR base station or E-UTRA base station connected to a 5GC transmits an RRC message to a terminal that deactivates a cell group, while including SDAP hierarchical configuration information in the RRC message, thereby changing or resetting the default bearer to a bearer belonging to a cell group that is not deactivated.

[0454] In the following disclosure, a first embodiment of terminal operation taking into account dual-connection technology configuration information when an RRC message (e.g., an RRCReconfiguration message) is received is proposed. In this embodiment, a procedure is proposed to enable the activation of a cell group without random access procedures (RACH-less activation) when the terminal activates, adds to, or modifies a cell group.

[0455] -If the terminal receives the RRCReconfiguration message, the terminal performs the following procedure:

[0456] 1>If the terminal is configured such that the MCG (or MN (master node)) is set to LTE (E-UTRA) and the SCG (or SN (secondary node)) is set to NR (i.e., E-UTRAnr-secondarycellgroupConfig is set), or if the terminal is configured to (NG)EN-DC (Next Generation E-UTRA NR-Dual connectivity connected to 5GC),

[0457] 2> If the RRCReconfiguration message is received via the E-UTRARRC message in the MobilityFromNRCommand message (a message instructing a handover from NR to (NG)EN-DC),

[0458] 3> In the message, if the reconfigurationWithSync setting information is included in the SCG's spCellConfig, or if the SCG's cell group state is not set to inactive,

[0459] 4> The terminal performs (or triggers or initiates) a random access procedure for the SpCell (or SCG or PSCell).

[0460] 4> If a cell group (e.g., a secondary cell group) is configured (or instructed) to be activated (or if the cell group's state is not set to deactivated), or if the cell group's previous state was deactivated, or if the terminal was in linked mode, the terminal performs a MAC reset. The MAC reset procedure is performed after the terminal has decided whether or not to perform a random access procedure, after triggering a random access procedure, after the random access procedure has been successfully completed (or after completion), or after activating a cell group without a random access procedure, or after successfully activating a cell group without a random access procedure (e.g., successful reception of a PDCCH, or reception of a transmission resource). This is because, when activating a cell group, if the MAC hierarchy is initialized first, the TAT (time alignment timer) timer linked to the cell group (or PSCell) will be considered to have expired, and the procedure for activating the cell group cannot be performed without the random access procedure proposed in this disclosure (i.e., the cell group can only be activated without the random access procedure if the TAT timer is running). Alternatively, instead of the MAC hierarchy initialization procedure, a partial MAC reset procedure is performed. The MAC hierarchy initialization procedure, or the partial MAC reset procedure, is described in detail below in this disclosure.

[0461] 3> Otherwise, if (else if) the SCG cell group state is not set to inactive, or if a new indicator (e.g., RACH-less indication) is included in the message instructing not to perform the random access procedure, or if the message contains reconfigurationWithSync configuration information that is not included in the SCG's spCellConfig,

[0462] 4> The terminal does not perform (or trigger or initiate) random access procedures with respect to SpCell (or SCG or PSCell).

[0463] 4> The terminal activates the SpCell without random access procedures. Alternatively, it may begin PDCCH monitoring or PDSCH reception for the SpCell.

[0464] 4> If a cell group (e.g., a secondary cell group) is configured (or instructed) to be activated (or if the cell group's state is not set to deactivated), or if the cell group's previous state was deactivated, or if the terminal was in linked mode, the terminal performs a MAC reset. The MAC reset procedure is performed after the terminal has decided whether or not to perform a random access procedure, after triggering a random access procedure, after the random access procedure has been successfully completed (or after completion), or after activating a cell group without a random access procedure, or after successfully activating a cell group without a random access procedure (e.g., successful reception of a PDCCH, or reception of a transmission resource). This is because, when activating a cell group, if the MAC hierarchy is initialized first, the TAT (time alignment timer) timer linked to the cell group or PTAG (or PSCell) will be considered to have expired, and the procedure to activate the cell group cannot be performed without the random access procedure proposed in this disclosure (i.e., the cell group can only be activated without the random access procedure if the TAT timer is running). Alternatively, instead of the MAC hierarchy initialization procedure, a partial MAC reset procedure is performed. The MAC hierarchy initialization procedure or the partial MAC reset procedure is described in detail below in this disclosure. 3> Otherwise,

[0465] 4> The terminal's execution procedure is terminated.

[0466] 1> If the terminal is configured such that the MCG (or MN (master node)) is set to NR and the SCG (or SN (secondary node)) is set to NR (i.e., E-UTRAnr-secondarycellgroupConfig is set), or the terminal is set to NR-DC (NR-Dual connectivity connected to 5GC), or if the RRCReconfiguration message is received via SRB1 in the nr-SCG with mrdc-secondary cell group configuration information, or if the mrdc-secondary cell group configuration information is received via SRB1 in an RRCReconfiguration or RRCResume message,

[0467] 2> In the message, if the reconfigurationWithSync setting information is included in the spCellConfig of nr-SCG, or if the cell group state of the SCG is not set to the inactive state,

[0468] 3> The terminal performs (or triggers or initiates) a random access procedure for the SpCell (or SCG or PSCell).

[0469] 3> If a cell group (e.g., a secondary cell group) is configured (or instructed) to be activated (or if the cell group's state is not set to inactive), or if the cell group's previous state was inactive, or if the terminal was in linked mode, the terminal performs a MAC reset. The MAC reset procedure is performed after the terminal has decided whether or not to perform a random access procedure, after triggering a random access procedure, after the random access procedure has been successfully completed (or after completion), or after activating a cell group without a random access procedure, or after successfully activating a cell group without a random access procedure (e.g., successful reception of a PDCCH, or reception of a transmission resource). This is because, when activating a cell group, if the MAC hierarchy is initialized first, the TAT (time alignment timer) timer linked to the cell group or PTAG (or PSCell) will be considered to have expired, and the procedure for activating the cell group cannot be performed without the random access procedure proposed in this disclosure (i.e., the cell group can only be activated without the random access procedure if the TAT timer is running). Alternatively, instead of the MAC hierarchy initialization procedure, a partial MAC reset procedure is performed. The MAC hierarchy initialization procedure or the partial MAC reset procedure will be described in detail below in this disclosure.

[0470] 2>Non, if (else if) the SCG cell group state is not set to inactive, or if a new indicator (e.g., RACH-less indication) is included in the message instructing not to perform the random access procedure, or if the message does not include reconfigurationWithSync configuration information in the SCG's spCellConfig,

[0471] 3> The terminal does not perform (or trigger or initiate) any random access procedures with respect to the SpCell (or SCG or PSCell).

[0472] 3> The terminal activates the SpCell without random access procedures. Alternatively, it may begin PDCCH monitoring or PDSCH reception for the SpCell.

[0473] 3> If a cell group (e.g., a secondary cell group) is configured (or instructed) to be activated (or if the cell group's state is not set to inactive), or if the cell group's previous state was inactive, or if the terminal was in linked mode, the terminal performs a MAC reset. The MAC reset procedure is performed after the terminal has decided whether or not to perform a random access procedure, after triggering a random access procedure, after the random access procedure has been successfully completed (or after completion), or after activating a cell group without a random access procedure, or after successfully activating a cell group without a random access procedure (e.g., successful reception of a PDCCH, or reception of a transmission resource). This is because, when activating a cell group, if the MAC hierarchy is initialized first, the TAT (time alignment timer) timer linked to the cell group or PTAG (or PSCell) will be considered to have expired, and the procedure for activating the cell group cannot be performed without the random access procedure proposed in this disclosure (i.e., the cell group can only be activated without the random access procedure if the TAT timer is running). Alternatively, instead of the MAC hierarchy initialization procedure, a partial MAC reset procedure is performed. The MAC hierarchy initialization procedure or the partial MAC reset procedure will be described in detail below in this disclosure.

[0474] 2> Otherwise (else),

[0475] 3> The terminal's execution procedure is terminated.

[0476] 1> In the message, if the reconfigurationWithSync configuration information is included in the spCellConfig of the MCG or SCG, and the MAC hierarchy of the NR cell group successfully completes the triggered random access procedure,

[0477] 2> Stop the first timer (T304) associated with the cell group (or, if the timer is running).

[0478] 2> Stop the second timer (T310) associated with the cell group or source SpCell (or if the timer is running).

[0479] -When the message contains "reconfigurationWithSync" and the device performs the procedure to reconfigure itself for synchronization (reconfiguration with Sync), the following steps are performed:

[0480] 1>If the DAPS (dual active protocol stack) bearer is not configured, or the cell group (or SCG) state is not set to inactive, or if RLM-related settings or beam failure detection-related settings information for an inactive cell group are not configured (if the cell group state is set to inactive, the second timer will continue to run, the RLM procedure will be performed, and support early cell group activation), or if this procedure is not performed for an inactive cell group (or SCG),

[0481] 2> Stop the second timer (T310) associated with the cell group or SpCell (or, if the timer is running).

[0482] 1> Stop the third timer (T312) associated with the cell group or SpCell (or, if the timer is running). 1> If the state of the cell group (or SCG) is not set to the deactivated state, or if this procedure is not performed for a deactivated cell group (or SCG),

[0483] 2> Set the value of the first timer (T304) included in the reconfigurationWithSync configuration information of the message, and start the first timer (T304) related to SpCell (PCell for MCG, or PSCell for SCG).

[0484] As proposed in this disclosure, if RRC messages (e.g., RRCReconfiguration messages) contain RLM-related configuration information or beam entity detection-related configuration information for a deactivated cell group (or SCG), the terminal performs the radio link failure detection procedure as follows:

[0485] 1>If the cell group state is set to inactive (or a beam failure detection procedure or RLM procedure is set for an inactive cell group), or if a predetermined number of (e.g., N310 value) indications of missynchronization are received from a lower level for a SpCell, the second timer (T310) for the SpCell is started (the second timer is stopped if it is running when the cell group state is activated, set to activated, or not set to inactive, or when a random access procedure is started or performed for a SpCell. Also, if the second timer expires, a radio connection failure is declared for the cell group).

[0486] 1>If a DAPS bearer is configured, or if a predetermined number of (e.g., N310 value) of instructions indicating a synchronization error are received from a lower level for a source SpCell, or if the first timer is running, the second timer (T310) related to the source SpCell is started.

[0487] 1> If the SpCell receives a predetermined number of synchronization errors from a lower level (e.g., N310 value) or if the first timer (T304) or the fourth timer is not running, the second timer (T310) related to the source SpCell is started.

[0488] In the following part of this disclosure, a second embodiment of terminal operation taking into account dual connection technology configuration information when an RRC message (e.g., an RRCReconfiguration message) is received is proposed. In this embodiment, a procedure is proposed to activate a cell group without random access procedures (RACH less activation) when the terminal activates, adds to, or modifies a cell group.

[0489] -If the terminal receives the RRCReconfiguration message, the terminal performs the following procedure:

[0490] 1>If the terminal is configured such that the MCG (or MN (master node)) is set to LTE (E-UTRA) and the SCG (or SN (secondary node)) is set to NR (i.e., E-UTRAnr-secondarycellgroupConfig is set), or if the terminal is configured to (NG)EN-DC (Next Generation E-UTRA NR-Dual connectivity connected to 5GC),

[0491] 2> If the RRCReconfiguration message is received via the E-UTRARRC message in the MobilityFromNRCommand message (a message instructing a handover from NR to (NG)EN-DC),

[0492] 3> In the message, if the reconfigurationWithSync setting information is included in the spCellConfig of the SCG, the cell group status of the SCG is not set to an inactive state, the TAT (time alignment timer) timer (a timer that determines the validity of the TA (timing advance) value for synchronizing the terminal and base station) that is running in the MAC layer is not running (or has expired, or has received an instruction from a lower layer that it has expired), an instruction that beam failure detection has been made is received from a lower layer (or a beam failure occurs), no beam failure detection procedure or RLM procedure is set for the inactive cell group, or if a radio connection failure procedure is detected in the RLM procedure (or the second timer (T310) has expired, or the radio connection with the SCG is not valid),

[0493] 4> The terminal performs (or triggers or initiates) a random access procedure for the SpCell (or SCG or PSCell).

[0494] 4> If a cell group (e.g., a secondary cell group) is configured (or instructed) to be activated (or if the cell group's state is not set to deactivated), or if the cell group's previous state was deactivated, or if the terminal was in linked mode, the terminal performs a MAC reset. The MAC reset procedure is performed after the terminal has decided whether or not to perform a random access procedure, after triggering a random access procedure, after the random access procedure has been successfully completed (or after completion), or after activating a cell group without a random access procedure, or after successfully activating a cell group without a random access procedure (e.g., successful reception of a PDCCH, or reception of a transmission resource). This is because, when activating a cell group, if the MAC hierarchy is initialized first, the TAT (time alignment timer) timer linked to the cell group or PTAG (or PSCell) will be considered to have expired, and the procedure for activating the cell group cannot be performed without the random access procedure proposed in this disclosure (i.e., the cell group can only be activated without the random access procedure if the TAT timer is running). Alternatively, instead of the MAC hierarchy initialization procedure, a partial MAC reset procedure is performed. The MAC hierarchy initialization procedure or the partial MAC reset procedure will be described in detail below in this disclosure.

[0495] 3>Non-existent, however, if (else if) the SCG cell group state is not set to deactivated, or a new indicator (e.g., RACH-less indication) is included in the message instructing not to perform the random access procedure, or a TAT (time alignment timer) timer (a timer that determines the validity of the TA (timing advance) value for synchronizing the terminal and base station) running in the MAC layer is running (or has not expired, or has not received an indication of expiration from a lower layer), or has not received an indication of beam failure detection from a lower layer (or no beam failure occurred), or a beam failure detection procedure or RLM procedure is set for the deactivated cell group, or in the RLM procedure, a radio connection failure procedure is not detected (or the second timer (T310) has not expired, or the SCG radio connection was valid), or in the message, if the reconfigurationWithSync configuration information is not included in the SCG's spCellConfig,

[0496] 4> The terminal does not perform (or trigger or initiate) random access procedures with respect to SpCell (or SCG or PSCell).

[0497] 4> The terminal activates the SpCell without random access procedures. Alternatively, it starts PDCCH monitoring or PDSCH reception for each SpCell.

[0498] 4> If a cell group (e.g., a secondary cell group) is configured (or instructed) to be activated (or if the cell group's state is not set to deactivated), or if the cell group's previous state was deactivated, or if the terminal was in linked mode, the terminal performs a MAC reset. The MAC reset procedure is performed after the terminal has decided whether or not to perform a random access procedure, after triggering a random access procedure, after the random access procedure has been successfully completed (or after completion), or after activating a cell group without a random access procedure, or after successfully activating a cell group without a random access procedure (e.g., successful reception of a PDCCH, or reception of a transmission resource). This is because, when activating a cell group, if the MAC hierarchy is initialized first, the TAT (time alignment timer) timer linked to the cell group or PTAG (or PSCell) will be considered to have expired, and the procedure for activating the cell group cannot be performed without the random access procedure proposed in this disclosure (i.e., the cell group can only be activated without the random access procedure if the TAT timer is running). Alternatively, instead of the MAC hierarchy initialization procedure, a partial MAC reset procedure is performed. The MAC hierarchy initialization procedure or the partial MAC reset procedure will be described in detail below in this disclosure.

[0499] 3>Non-existent, however, if (else if) the SCG cell group state is not set to inactive, or a new indicator (e.g., RACH-less indication) is included in the message instructing not to perform the random access procedure, or the TAT (time alignment timer) timer (a timer that determines the validity of the TA (timing advance) value for synchronizing the terminal and base station) that is running in the MAC layer is not running (or has expired, or an indication of expiration is received from a lower layer), or an indication of beam failure detection is received from a lower layer (or a beam failure occurs), or no beam failure detection procedure or RLM procedure is set for the inactive cell group, or a radio connection failure procedure is detected in the RLM procedure (or the second timer (T310) expires, or the radio connection with the SCG is not valid), or if the message states that reconfigurationWithSync configuration information is not included in the SCG's spCellConfig,

[0500] 4> The terminal performs (or triggers or initiates) a random access procedure for the SpCell (or SCG or PSCell).

[0501] 4> If a cell group (e.g., a secondary cell group) is configured (or instructed) to be activated (or if the cell group's state is not set to deactivated), or if the cell group's previous state was deactivated, or if the terminal was in linked mode, the terminal performs a MAC reset. The MAC reset procedure is performed after the terminal has decided whether or not to perform a random access procedure, after triggering a random access procedure, after the random access procedure has been successfully completed (or after completion), or after activating a cell group without a random access procedure, or after successfully activating a cell group without a random access procedure (e.g., successful reception of a PDCCH, or reception of a transmission resource). This is because, when activating a cell group, if the MAC hierarchy is initialized first, the TAT (time alignment timer) timer linked to the cell group or PTAG (or PSCell) will be considered to have expired, and the procedure for activating the cell group cannot be performed without the random access procedure proposed in this disclosure (i.e., the cell group can only be activated without the random access procedure if the TAT timer is running). Alternatively, instead of the MAC hierarchy initialization procedure, a partial MAC reset procedure is performed. The MAC hierarchy initialization procedure or the partial MAC reset procedure will be described in detail below in this disclosure.

[0502] 3> Otherwise (else),

[0503] 4> The terminal's execution procedure is terminated.

[0504] 1> If the terminal is configured such that the MCG (or MN (master node)) is set to NR and the SCG (or SN (secondary node)) is set to NR (i.e., E-UTRAnr-secondarycellgroupConfig is set), or the terminal is set to NR-DC (NR-Dual connectivity connected to 5GC), or if the RRCReconfiguration message is received via SRB1 in the nr-SCG with mrdc-secondary cell group configuration information, or if the mrdc-secondary cell group configuration information is received via SRB1 in an RRCReconfiguration or RRCResume message,

[0505] 2> In the message, if the reconfigurationWithSync setting information is included in the spCellConfig of nr-SCG, the cell group status of the SCG is not set to an inactive state, the TAT (time alignment timer) timer (a timer that determines the validity of the TA (timing advance) value for synchronizing the terminal and base station) that is running in the MAC layer is not running (or has expired, or has received an instruction from a lower layer that it has expired), an instruction that beam failure detection has been made is received from a lower layer (or a beam failure occurs), or a beam failure detection procedure or RLM procedure related to an inactive cell group is not set, or if a radio connection failure procedure is detected in the RLM procedure (or the second timer (T310) has expired, or the radio connection with the SCG is not valid),

[0506] 3> The terminal performs (or triggers or initiates) a random access procedure for the SpCell (or SCG or PSCell).

[0507] 3> If a cell group (e.g., a secondary cell group) is configured (or instructed) to be activated (or if the cell group's state is not set to inactive), or if the cell group's previous state was inactive, or if the terminal was in linked mode, the terminal performs a MAC reset. The MAC reset procedure is performed after the terminal has decided whether or not to perform a random access procedure, after triggering a random access procedure, after the random access procedure has been successfully completed (or after completion), or after activating a cell group without a random access procedure, or after successfully activating a cell group without a random access procedure (e.g., successful reception of a PDCCH, or reception of a transmission resource). This is because, when activating a cell group, if the MAC hierarchy is initialized first, the TAT (time alignment timer) timer linked to the cell group or PTAG (or PSCell) will be considered to have expired, and the procedure for activating the cell group cannot be performed without the random access procedure proposed in this disclosure (i.e., the cell group can only be activated without the random access procedure if the TAT timer is running). Alternatively, instead of the MAC hierarchy initialization procedure, a partial MAC reset procedure is performed. The MAC hierarchy initialization procedure or the partial MAC reset procedure will be described in detail below in this disclosure.

[0508] 2>Non-existent, however, if (else if) the SCG cell group state is not set to deactivated, or a new indicator (e.g., RACH-less indication) is included in the message instructing not to perform the random access procedure, or the TAT (time alignment timer) timer (a timer that determines the validity of the TA (timing advance) value for synchronizing the terminal and base station) running in the MAC layer is running (or has not expired, or has not received an indication of expiration from a lower layer), or has not received an indication of beam failure detection from a lower layer (or no beam failure has occurred), or a beam failure detection procedure or RLM procedure related to a deactivated cell group is set, or if, in the message, the reconfigurationWithSync setting information is not included in the SCG's spCellConfig, or if a radio connection failure procedure has not been detected in the RLM procedure (or if the second timer (T310) has not expired, or if the radio connection with the SCG was valid),

[0509] 3> The terminal does not perform (or trigger or initiate) any random access procedures with respect to the SpCell (or SCG or PSCell).

[0510] 3> The terminal activates the SpCell without random access procedures. Alternatively, it starts PDCCH monitoring or PDSCH reception for each SpCell.

[0511] 4> If a cell group (e.g., a secondary cell group) is configured (or instructed) to be activated (or if the cell group's state is not set to deactivated), or if the cell group's previous state was deactivated, or if the terminal was in linked mode, the terminal performs a MAC reset. The MAC reset procedure is performed after the terminal has decided whether or not to perform a random access procedure, after triggering a random access procedure, after the random access procedure has been successfully completed (or after completion), or after activating a cell group without a random access procedure, or after successfully activating a cell group without a random access procedure (e.g., successful reception of a PDCCH, or reception of a transmission resource). This is because, when activating a cell group, if the MAC hierarchy is initialized first, the TAT (time alignment timer) timer linked to the cell group or PTAG (or PSCell) will be considered to have expired, and the procedure for activating the cell group cannot be performed without the random access procedure proposed in this disclosure (i.e., the cell group can only be activated without the random access procedure if the TAT timer is running). Alternatively, instead of the MAC hierarchy initialization procedure, a partial MAC reset procedure is performed. The MAC hierarchy initialization procedure or the partial MAC reset procedure will be described in detail below in this disclosure.

[0512] 2>Non-existent, however, if (else if) the SCG cell group state is not set to inactive, or a new indicator (e.g., RACH-less indication) is included in the message instructing not to perform the random access procedure, or the TAT (time alignment timer) timer (a timer that determines the validity of the TA (timing advance) value for synchronizing the terminal and base station) that is running in the MAC layer is not running (or has expired, or an indication of expiration is received from a lower layer), or an indication of beam failure detection is received from a lower layer (or a beam failure occurs), or no beam failure detection procedure or RLM procedure is set for the inactive cell group, or a radio connection failure procedure is detected in the RLM procedure (or the second timer (T310) expires, or the radio connection with the SCG is not valid), or if the message states that reconfigurationWithSync configuration information is not included in the SCG's spCellConfig,

[0513] 3> The terminal performs (or triggers or initiates) a random access procedure for the SpCell (or SCG or PSCell).

[0514] 3> If a cell group (e.g., a secondary cell group) is configured (or instructed) to be activated (or if the cell group's state is not set to inactive), or if the cell group's previous state was inactive, or if the terminal was in linked mode, the terminal will reset its MAC hierarchy. The MAC reset procedure may also be performed after the terminal has decided whether or not to perform a random access procedure, after triggering a random access procedure, after the random access procedure has been successfully completed (or after completion), or after activating a cell group without a random access procedure, or after successfully activating a cell group without a random access procedure (e.g., successful reception of a PDCCH, or reception of a transmission resource). This is because, when activating a cell group, if the MAC hierarchy is initialized first, the TAT (time alignment timer) timer linked to the cell group or PTAG (or PSCell) will be considered to have expired, and the procedure for activating the cell group cannot be performed without the random access procedure proposed in this disclosure (i.e., the cell group can only be activated without the random access procedure if the TAT timer is running). Alternatively, instead of the MAC hierarchy initialization procedure, a partial MAC reset procedure is performed. The MAC hierarchy initialization procedure or the partial MAC reset procedure will be described in detail below in this disclosure.

[0515] 2> Otherwise (else),

[0516] 3> The terminal's execution procedure is terminated.

[0517] 1> In the message, if the reconfigurationWithSync configuration information is included in the spCellConfig of the MCG or SCG, and the MAC hierarchy of the NR cell group successfully completes the triggered random access procedure,

[0518] 2> Stop the first timer (T304) associated with the cell group (or, if the timer is running).

[0519] 2> Stop the second timer (T310) associated with the cell group or source SpCell (or if the timer is running).

[0520] If the message contains "reconfigurationWithSync" and the device performs the procedure to reconfigure itself for synchronization (reconfiguration with Sync), it will perform the following steps:

[0521] 1>If the DAPS (dual active protocol stack) bearer is not configured, or the cell group (or SCG) state is not set to inactive, or if RLM-related settings or beam failure detection-related settings information for an inactive cell group are not configured (if the cell group state is set to inactive, the second timer will continue to run, the RLM procedure will be performed, and support early cell group activation), or if this procedure is not performed for an inactive cell group (or SCG),

[0522] 2> Stop the second timer (T310) associated with the cell group or SpCell (or, if the timer is running).

[0523] 1> Stop the third timer (T312) associated with the cell group or SpCell (or, if the timer is running).

[0524] 1> If the state of the cell group (or SCG) is not set to the deactivated state, or if this procedure is not performed for a deactivated cell group (or SCG),

[0525] 2> Set the value of the first timer (T304) included in the reconfigurationWithSync configuration information of the message, and start the first timer (T304) related to SpCell (PCell for MCG, or PSCell for SCG).

[0526] As proposed in this disclosure, if RRC messages (e.g., RRCReconfiguration messages) contain RLM-related configuration information or beam entity detection-related configuration information for a deactivated cell group (or SCG), the terminal performs the radio link failure detection procedure as follows:

[0527] 1>If the cell group state is set to inactive (or a beam failure detection procedure or RLM procedure is set for an inactive cell group), or if a predetermined number of (e.g., N310 value) indications of missynchronization are received from a lower level for a SpCell, the second timer (T310) for the SpCell is started (the second timer is stopped if it is running when the cell group state is activated, set to activated, or not set to inactive, or when a random access procedure is started or performed for a SpCell, or when a random access procedure is successfully completed. Also, if the second timer expires, a radio connection failure is declared for the cell group).

[0528] 1>If a DAPS bearer is configured, or if a predetermined number of (e.g., N310 value) of instructions indicating a synchronization error are received from a lower level for a source SpCell, or if the first timer is running, the second timer (T310) related to the source SpCell is started.

[0529] 1> If the SpCell receives a predetermined number of synchronization errors from a lower level (e.g., N310 value) or if the first timer (T304) or the fourth timer is not running, the second timer (T310) related to the source SpCell is started.

[0530] In the following part of this disclosure, a third embodiment of terminal operation taking into account dual connection technology configuration information when an RRC message (e.g., an RRCReconfiguration message) is received is proposed. In this embodiment, a procedure is proposed to activate a cell group without random access procedures (RACH less activation) when the terminal activates, adds to, or modifies a cell group.

[0531] -If the terminal receives the RRCReconfiguration message, the terminal performs the following procedure:

[0532] 1>If the terminal is configured such that the MCG (or MN (master node)) is set to LTE (E-UTRA) and the SCG (or SN (secondary node)) is set to NR (i.e., E-UTRAnr-secondarycellgroupConfig is set), or if the terminal is configured to (NG)EN-DC (Next Generation E-UTRA NR-Dual connectivity connected to 5GC),

[0533] 2> If the RRCReconfiguration message is received via the E-UTRARRC message in the MobilityFromNRCommand message (a message instructing a handover from NR to (NG)EN-DC),

[0534] 3> In the message, if the reconfigurationWithSync setting information is included in the spCellConfig of the SCG, the cell group status of the SCG is not set to an inactive state, the TAT (time alignment timer) timer (a timer that determines the validity of the TA (timing advance) value for synchronizing the terminal and base station) that is running in the MAC layer is not running (or has expired, or has received an instruction from a lower layer that it has expired), an instruction that beam f...

Claims

1. A method for a first base station to perform dual access in a wireless communication system, The steps include sending the request message regarding the dual access to the second base station, The steps include receiving a response message from the second base station that includes configuration information for the second cell group (SCG) for the dual access, The steps include determining whether the response message contains information regarding the state of the SCG, The process includes the step of transmitting a radio resource control (RRC) message to a terminal, which includes setting information for the SCG and information regarding the status of the SCG. The method is characterized in that the SCG configuration information includes information that QoS flow remapping should not be performed on the data radio bearer (DRB) associated with the SCG if the RRC message includes an indicator that the SCG is deactivated.

2. The information relating to the state of the SCG includes the current state of the SCG. The method according to claim 1, characterized in that the SCG setting information includes information that the QoS flow remapping will not be performed on the DRB associated with the SCG if the current state of the SCG is deactivated.

3. The information relating to the state of the SCG includes an indicator indicating the deactivation of the SCG. The method according to claim 1, characterized in that the SCG setting information includes information that the QoS flow remapping is not performed on the DRB associated with the SCG.

4. The step of transmitting the RRC message to the terminal is: The steps include transmitting the configuration information for QoS flow remapping to the terminal, The method according to claim 1, further comprising the step of transmitting the RRC message containing information regarding the status of the SCG to the terminal.

5. The steps include sending an RRC message containing SDAP layer configuration information to the aforementioned terminal, The step of transmitting the RRC message, which includes an indicator indicating the deactivation of the SCG, to the terminal, The method according to claim 1, characterized in that the RRC message containing the SDAP layer configuration information also contains the default bearer configuration information.

6. The method according to the 5th method, characterized in that the default bearer setting information is reset to a bearer included in the deactivated cell group.

7. A method for a terminal to perform dual access in a wireless communication system, The steps include receiving a radio resource control (RRC) message, which includes configuration information and information regarding the status of the second cell group (SCG), based on a message from a second base station constituting the second cell group (SCG), The step includes sending an RRC response message that includes information on whether the SCG setting is successful or not, The method is characterized in that the SCG configuration information includes information that QoS flow remapping should not be performed on the data radio bearer (DRB) associated with the SCG if the RRC message includes an indicator that the SCG is deactivated.

8. The information relating to the state of the SCG includes the current state of the SCG. The method according to 7, characterized in that the SCG setting information includes information that the QoS flow remapping will not be performed on the DRB associated with the SCG if the current state of the SCG is deactivated.

9. The information relating to the state of the SCG includes an indicator indicating the deactivation of the SCG. The method according to 7, characterized in that the SCG setting information includes information that the QoS flow remapping is not performed on the DRB associated with the SCG.

10. The step of receiving the RRC message is: The steps include receiving configuration information for QoS flow remapping from the first base station, The method according to 7, further comprising the step of receiving the RRC message from the first base station, which includes information regarding the state of the SCG.

11. The first base station receives an RRC message containing SDAP layer configuration information, The process includes the step of receiving the RRC message from the first base station, which includes an indicator indicating the deactivation of the SCG, The method according to 7, characterized in that the RRC message including the SDAP layer configuration information includes the default bearer configuration information.

12. The method according to 11, characterized in that the default bearer setting information is reset to a bearer included in the deactivated cell group.

13. A first base station for performing dual access in a wireless communication system, The first base station is, Transmitter / receiver unit, The unit comprises at least one processor coupled to the transmitting and receiving unit, The aforementioned at least one processor is The request message regarding the dual access is sent to the second base station. The second base station receives a response message containing configuration information regarding the second cell group (SCG) for the dual access, Identify whether the response message contains information regarding the state of the SCG, A radio resource control (RRC) message containing the SCG setting information and information regarding the SCG status is transmitted to the terminal. The first base station is characterized in that the SCG configuration information includes information that QoS flow remapping will not be performed on the data radio bearer (DRB) associated with the SCG if the RRC message includes an indicator that the SCG is deactivated.

14. The information relating to the state of the SCG includes the current state of the SCG. Furthermore The first base station according to claim 13, characterized in that the SCG configuration information includes information that the QoS flow remapping will not be performed on the DRB associated with the SCG if the current state of the SCG is deactivated.

15. The information relating to the state of the SCG includes an indicator indicating the deactivation of the SCG. The first base station according to claim 13, characterized in that the SCG configuration information includes information that the QoS flow remapping is not performed on the DRB associated with the SCG.

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