Method and apparatus for efficiently operating dormant bandwidth part in a next generation mobile communication system

Abstract

The present disclosure relates to a communication technique and a system for integrating a 5G communication system with IoT technology to support higher data transmission rates than those of 4G systems. The present disclosure can be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, security and safety-related services, etc.) based on 5G communication technology and IoT-related technology. According to the present disclosure, by a method that enables operating a new hibernation or dormant mode at a bandwidth part-level, carrier aggregation technology can be rapidly activated, and the battery of the terminal can be reduced.

Description

Technology Field

[0001] The present disclosure relates to mobile communication system terminals and base station operations. Specifically, the present invention relates to a method and apparatus for efficiently operating a dormant portion bandwidth in a next-generation mobile communication system. Background Technology

[0002] Efforts are being made to develop improved 5G or pre-5G communication systems to meet the increasing demand for wireless data traffic since the commercialization of 4G communication systems. For this reason, 5G or pre-5G communication systems are referred to as systems beyond the 4G network or systems following the LTE system. To achieve high data transmission rates, the implementation of 5G communication systems in the mmWave band (e.g., the 60 GHz band) is being considered. To mitigate path loss and increase transmission distance in the mmWave band, technologies such as beamforming, massive MIMO, full Dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large-scale antennas are being discussed for 5G communication systems. In addition, to improve the network of the system, the development of technologies such as advanced small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network, Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation is taking place in 5G communication systems.In addition, advanced coding modulation (ACM) methods such as FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), as well as advanced access technologies such as FBMC (Filter Bank Multi Carrier), NOMA (non-orthogonal multiple access), and SCMA (sparse code multiple access), are being developed in 5G systems.

[0003] Meanwhile, the Internet is evolving from a human-centered network where humans generate and consume information into an IoT (Internet of Things) network where distributed components, such as objects, exchange and process information. IoE (Internet of Everything) technology, which combines IoT with Big Data processing technologies through connections with cloud servers, is also emerging. To implement IoT, technological elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required; consequently, technologies such as sensor networks, Machine-to-Machine (M2M) communication, and Machine-Type Communication (MTC) are currently being researched to facilitate the connection of objects. In an IoT environment, intelligent IT services that create new value for human life by collecting and analyzing data generated from connected objects can be provided. Through the convergence and integration of existing IT technologies with various industries, IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services.

[0004] Accordingly, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, Machine to Machine (M2M), and Machine Type Communication (MTC) are being implemented using 5G communication techniques such as beamforming, MIMO, and array antennas. The application of cloud RAN as a big data processing technology, as previously described, can also be considered an example of the convergence of 5G and IoT technologies.

[0005] Meanwhile, the need for methods to utilize carrier integration technology in next-generation mobile communication systems has emerged. The problem to be solved

[0006] In next-generation mobile communication systems, carrier aggregation technology can be utilized to provide terminals with services featuring high data transfer rates and low transmission latency. However, a method is required to prevent processing delays that may occur when configuring and activating carrier aggregation technology for terminals connected to a network, or when deactivating it after use. In particular, if a terminal maintains multiple cells in an active state to use carrier aggregation technology, significant battery consumption may occur because the terminal must perform PDCCH monitoring for each cell. Conversely, if the aforementioned multiple cells are kept in a deactivated state to reduce battery consumption, data transmission and reception delays may occur due to the delays incurred when activating these multiple cells during the use of carrier aggregation technology. means of solving the problem

[0007] The present invention, for solving the above-mentioned problems, is characterized in that a method for processing a control signal in a wireless communication system comprises: a step of receiving a first control signal transmitted from a base station; a step of processing the received first control signal; and a step of transmitting a second control signal generated based on the processing to the base station. Effects of the invention

[0008] The present invention proposes a new hibernation mode that enables an RRC connection mode terminal, which has established a connection with a network in a next-generation mobile communication system, to rapidly activate and deactivate carrier aggregation technology. The present invention proposes a method to operate the new hibernation (or dormant) mode at the bandwidth part-level, thereby enabling rapid activation of carrier aggregation technology and saving battery power for the terminal. Brief explanation of the drawing

[0009] FIG. 1a is a diagram illustrating the structure of an LTE system to which the present invention can be applied. FIG. 1b is a diagram showing the wireless protocol structure in an LTE system to which the present invention can be applied. FIG. 1c is a diagram illustrating the structure of a next-generation mobile communication system to which the present invention can be applied. FIG. 1d is a diagram showing the wireless protocol structure of a next-generation mobile communication system to which the present invention can be applied. FIGS. 1ea and FIGS. 1eb are diagrams illustrating a procedure for providing services to a terminal using an extremely wide frequency bandwidth efficiently in a next-generation mobile communication system of the present invention. FIG. 1f illustrates a procedure for a terminal to switch from an RRC idle mode to an RRC connected mode in a next-generation mobile communication system of the present invention, and proposes a method for setting a plurality of bandwidth parts (BWP) and setting a default BWP or a first active BWP. FIG. 1g is a diagram showing the state transition procedure for each partial bandwidth proposed in the present invention. FIGS. 1h and FIGS. 1i are drawings illustrating partial bandwidth switching in the first embodiment of the present invention. FIG. 1j is a diagram illustrating a first method of performing partial bandwidth switching in a first embodiment of the present invention. FIG. 1k is a diagram illustrating a second method of performing partial bandwidth switching in a first embodiment of the present invention. FIG. 11 is a diagram showing MAC control information indicating a state transition to an active state, a dormant state, or an inactive state proposed in the present invention. FIG. 1m is a diagram illustrating a specific terminal operation in the present invention in which the terminal reads PDCCH according to scheduling setting information for each cell and performs a partial bandwidth switching procedure. Figure 1n illustrates the structure of a terminal to which an embodiment of the present invention can be applied. FIG. 10 illustrates the block configuration of a TRP in a wireless communication system to which an embodiment of the present invention can be applied. Specific details for implementing the invention

[0010] The operating principle of the present invention will be described in detail below with reference to the attached drawings. In describing the present invention below, specific descriptions of related known functions or configurations will be omitted if it is determined that such detailed descriptions would unnecessarily obscure the essence of the invention. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intentions or conventions of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0011] In the following description of the present invention, specific descriptions of related known functions or configurations will be omitted if it is determined that such detailed descriptions may unnecessarily obscure the essence of the invention. Embodiments of the present invention will be described below with reference to the attached drawings.

[0012] Terms used in the following description to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc., are examples provided for the convenience of explanation. Accordingly, the present invention is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0013] For convenience of explanation, the present invention uses terms and names defined in the 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) standard. However, the present invention is not limited by the above terms and names and can be applied equally to systems conforming to other standards. In the present invention, eNB may be used interchangeably with gNB for convenience of explanation. That is, a base station described as eNB may represent a gNB.

[0015] FIG. 1a is a diagram illustrating the structure of an LTE system to which the present invention can be applied.

[0016] Referring to FIG. 1a, as illustrated, the wireless access network of the LTE system consists of a next-generation base station (Evolved Node B, hereinafter ENB, Node B or base station) (1a-05, 1a-10, 1a-15, 1a-20), an MME (1a-25, Mobility Management Entity), and an S-GW (1a-30, Serving-Gateway). A user terminal (User Equipment, hereinafter UE or terminal) (1a-35) connects to an external network through the ENB (1a-05 ~ 1a-20) and the S-GW (1a-30).

[0017] In FIG. 1a, the ENBs (1a-05 to 1a-20) correspond to the existing Node B of the UMTS system. The ENBs are connected to the UEs (1a-35) via a wireless channel and perform more complex roles than the existing Node B. In LTE systems, since all user traffic, including real-time services such as VoIP (Voice over IP) via the Internet Protocol, is serviced through a shared channel, a device is required to aggregate status information such as the buffer status, available transmission power status, and channel status of the UEs to perform scheduling; this is handled by the ENBs (1a-05 to 1a-20). A single ENB typically controls multiple cells. For example, to achieve a transmission speed of 100 Mbps, the LTE system uses Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) as a wireless access technology, for instance, in a 20 MHz bandwidth. In addition, an Adaptive Modulation & Coding (hereinafter referred to as AMC) method is applied to determine the modulation scheme and channel coding rate according to the channel conditions of the terminal. The S-GW (1a-30) is a device that provides data bearers and creates or removes data bearers under the control of the MME (1a-25). The MME is a device that is responsible for various control functions as well as mobility management functions for the terminal and is connected to multiple base stations.

[0018] FIG. 1b is a diagram showing the wireless protocol structure in an LTE system to which the present invention can be applied.

[0019] Referring to Fig. 1b, the wireless protocol of the LTE system consists of PDCP (Packet Data Convergence Protocol 1b-05, 1b-40), RLC (Radio Link Control 1b-10, 1b-35), and MAC (Medium Access Control 1b-15, 1b-30) at the terminal and ENB, respectively. PDCP (Packet Data Convergence Protocol) (1b-05, 1b-40) is responsible for operations such as IP header compression / decompression. The main functions of PDCP are summarized as follows.

[0020] - Header compression and decompression features (ROHC only)

[0021] - User data transfer function (Transfer of user data)

[0022] - Sequential delivery function (In-sequence delivery of upper layer PDUs at PDCP re-establishment procedure for RLC AM)

[0023] - Order reordering function (For split bearers in DC (only support for RLC AM): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

[0024] - Duplicate detection function (Duplicate detection of lower layer SDUs at PDCP re-establishment procedure for RLC AM)

[0025] - Retransmission function (Retransmission of PDCP SDUs at handover and, for split bearers in DC, of ​​PDCP PDUs at PDCP data-recovery procedure, for RLC AM)

[0026] - Encryption and decryption functions (Ciphering and deciphering)

[0027] - Timer-based SDU discard in uplink.

[0029] Radio Link Control (hereinafter referred to as RLC) (1b-10, 1b-35) reconstructs PDCP Packet Data Units (PDUs) into an appropriate size to perform ARQ operations, etc. The main functions of RLC are summarized as follows.

[0030] - Data transfer function (Transfer of upper layer PDUs)

[0031] - ARQ function (Error Correction through ARQ (only for AM data transfer))

[0032] - Concatenation, segmentation, and reassembly functions (Concatenation, segmentation, and reassembly of RLC SDUs (only for UM and AM data transfer))

[0033] - Re-segmentation function (Re-segmentation of RLC data PDUs (only for AM data transfer))

[0034] - Reordering function (Reordering of RLC data PDUs (only for UM and AM data transfer)

[0035] - Duplicate detection function (only for UM and AM data transfer)

[0036] - Error detection function (Protocol error detection (only for AM data transfer))

[0037] - RLC SDU deletion function (RLC SDU discard (only for UM and AM data transfer))

[0038] RLC re-establishment function

[0040] MAC (1b-15, 1b-30) is connected to multiple RLC layer devices configured in a terminal and performs the operation of multiplexing RLC PDUs into MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of MAC are summarized as follows.

[0041] - Mapping function (Mapping between logical channels and transport channels)

[0042] - Multiplexing and demultiplexing function (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)

[0043] - Scheduling information reporting function

[0044] - HARQ function (Error correction through HARQ)

[0045] - Priority handling between logical channels of one UE

[0046] - Priority handling between UEs by means of dynamic scheduling

[0047] - MBMS service identification function

[0048] - Transport format selection function

[0049] - Padding

[0050] The physical layer (1b-20, 1b-25) performs the operation of channel coding and modulating upper layer data, creating OFDM symbols and transmitting them to the wireless channel, or demodulating OFDM symbols received through the wireless channel and channel decoding them to transmit them to the upper layer.

[0051] FIG. 1c is a diagram illustrating the structure of a next-generation mobile communication system to which the present invention can be applied.

[0052] Referring to FIG. 1c, as illustrated, the wireless access network of a next-generation mobile communication system (hereinafter NR or 5G) consists of a next-generation base station (New Radio Node B, hereinafter NR gNB or NR base station) (1c-10) and an NR CN (1c-05, New Radio Core Network). A user terminal (New Radio User Equipment, hereinafter NR UE or terminal) (1c-15) connects to an external network through the NR gNB (1c-10) and the NR CN (1c-05).

[0053] In FIG. 1c, the NR gNB (1c-10) corresponds to the eNB (Evolved Node B) of the existing LTE system. The NR gNB is connected to the NR UE (1c-15) via a wireless channel and can provide superior service compared to the existing Node B. In next-generation mobile communication systems, since all user traffic is serviced through a shared channel, a device is required to collect status information such as the buffer status, available transmission power status, and channel status of the UEs to perform scheduling, and this is handled by the NR NB (1c-10). A single NR gNB typically controls multiple cells. To achieve ultra-high-speed data transmission compared to current LTE, it can have a maximum bandwidth greater than the existing maximum bandwidth, and beamforming technology can be additionally incorporated by using Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) as the wireless access technology. In addition, an Adaptive Modulation & Coding (AMC) method is applied to determine the modulation scheme and channel coding rate according to the channel conditions of the terminal. The NR CN (1c-05) performs functions such as mobility support, bearer configuration, and QoS configuration. The NR CN is a device responsible for various control functions as well as mobility management functions for the terminal, and is connected to multiple base stations. Furthermore, the next-generation mobile communication system can be interoperable with existing LTE systems, and the NR CN is connected to the MME (1c-25) via a network interface. The MME is connected to the existing base station eNB (1c-30).

[0054] FIG. 1d is a diagram showing the wireless protocol structure of a next-generation mobile communication system to which the present invention can be applied.

[0055] Referring to Fig. 1d, the wireless protocol of the next-generation mobile communication system consists of NR SDAP (1d-01, 1d-45), NR PDCP (1d-05, 1d-40), NR RLC (1d-10, 1d-35), and NR MAC (1d-15, 1d-30) at the terminal and the NR base station, respectively.

[0056] The main functions of NR SDAP(1d-01, 1d-45) may include some of the following functions.

[0057] - User data transfer function (transfer of user plane data)

[0058] - Mapping function between a QoS flow and a DRB for both DL and UL for uplink and downlink

[0059] - Marking QoS flow ID in both DL and UL packets for uplink and downlink

[0060] - Function to map reflective QoS flow to data bearers for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0061] Regarding the SDAP layer device, the terminal may receive a setting via an RRC message indicating whether to use the header of the SDAP layer device or the functions of the SDAP layer device for each PDCP layer device, bearer, or logical channel. If the SDAP header is configured, the terminal may be instructed to update or reset the mapping information for the QoS flow of the uplink and downlink and the data bearer using the NAS reflective QoS and AS reflective QoS 1-bit indicators of the SDAP header. The SDAP header may include QoS flow ID information indicating QoS. The QoS information may be used for data processing priority, scheduling information, etc., to support smooth service.

[0063] The main functions of NR PDCP (1d-05, 1d-40) may include some of the following functions.

[0064] Header compression and decompression (ROHC only)

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

[0066] - Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0067] - Out-of-sequence delivery of upper layer PDUs

[0068] - Reordering function (PDCP PDU reordering for reception)

[0069] - Duplicate detection function (Duplicate detection of lower layer SDUs)

[0070] - Retransmission of PDCP SDUs

[0071] - Encryption and decryption functions (Ciphering and deciphering)

[0072] - Timer-based SDU discard in uplink.

[0073] In the above, the reordering function of the NR PDCP device refers to a function of reordering PDCP PDUs received from a lower layer in order based on the PDCP SN (sequence number), and may include a function of transmitting data to an upper layer in the reordered order, or a function of transmitting immediately without considering the order, may include a function of recording lost PDCP PDUs by reordering, may include a function of reporting the status of lost PDCP PDUs to the transmitting side, and may include a function of requesting retransmission of lost PDCP PDUs.

[0075] The main functions of NR RLC(1d-10, 1d-35) may include some of the following functions.

[0076] - Data transfer function (Transfer of upper layer PDUs)

[0077] - Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0078] - Out-of-sequence delivery of upper layer PDUs

[0079] - ARQ function (Error Correction through ARQ)

[0080] - Concatenation, segmentation, and reassembly functions of RLC SDUs

[0081] - Re-segmentation function (Re-segmentation of RLC data PDUs)

[0082] - Reordering function (Reordering of RLC data PDUs)

[0083] - Duplicate detection

[0084] - Error detection function (Protocol error detection)

[0085] - RLC SDU discard function

[0086] RLC re-establishment function

[0087] In the above, the in-sequence delivery function of the NR RLC device refers to the function of delivering RLC SDUs received from a lower layer to an upper layer in sequence; it may include a function to reassemble and deliver them if a single RLC SDU is received divided into multiple RLC SDUs; it may include a function to rearrange received RLC PDUs based on an RLC SN (sequence number) or PDCP SN (sequence number); it may include a function to record lost RLC PDUs after rearranging the order; it may include a function to report the status of lost RLC PDUs to the transmitting side; it may include a function to request retransmission of lost RLC PDUs; if there are lost RLC SDUs, it may include a function to deliver only the RLC SDUs prior to the lost RLC SDU to the upper layer in sequence; or if a predetermined timer has expired even if there are lost RLC SDUs, it may include a function to deliver all RLC SDUs received before the timer started to the upper layer in sequence; or It may include a function that delivers all RLC SDUs received up to the present to the upper layer in order once a predetermined timer has expired, even if there are lost RLC SDUs. Additionally, the RLC PDUs mentioned above may be processed in the order they are received (regardless of the order of sequence numbers, but in the order of arrival) and delivered to the PDCP device out of order (out-of-sequence delivery). In the case of segments, segments stored in a buffer or to be received later may be received, reconstructed into a single complete RLC PDU, processed, and then delivered to the PDCP device.The above NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer or replaced with the multiplexing function of the NR MAC layer.

[0089] In the above, the out-of-sequence delivery function of the NR RLC device refers to the function of delivering RLC SDUs received from a lower layer directly to an upper layer regardless of order. It may include a function of reassembling and delivering RLC SDUs when a single RLC SDU is received divided into multiple RLC SDUs, and may include a function of storing the RLC SN or PDCP SN of the received RLC PDUs and sorting the order to record the lost RLC PDUs.

[0091] The NR MAC (1d-15, 1d-30) can be connected to multiple NR RLC layer devices configured in a terminal, and the main functions of the NR MAC may include some of the following functions.

[0092] - Mapping function (Mapping between logical channels and transport channels)

[0093] - Multiplexing and demultiplexing functions (Multiplexing / demultiplexing of MAC SDUs)

[0094] - Scheduling information reporting function

[0095] - HARQ function (Error correction through HARQ)

[0096] - Priority handling between logical channels of one UE

[0097] - Priority handling between UEs by means of dynamic scheduling

[0098] - MBMS service identification function

[0099] - Transport format selection function

[0100] - Padding

[0101] The NR PHY layer (1d-20, 1d-25) can perform the operation of channel coding and modulating upper layer data, creating OFDM symbols and transmitting them to the wireless channel, or demodulating OFDM symbols received through the wireless channel and channel decoding them to transmit them to the upper layer.

[0103] The present invention proposes a method to rapidly activate carrier aggregation technology in a next-generation mobile communication system and reduce terminal battery consumption.

[0104] A network or base station can configure Spcells (Pcells and PScells) and multiple Scells for a terminal. In the above, Spcell refers to a Pcell when the terminal communicates with a single base station, and may refer to the Pcell of the master base station or the PScell ​​of the secondary base station when the terminal communicates with two base stations (a master base station and a secondary base station). In the above, Pcell or Pscell represents the primary cell used when the terminal and the base station communicate in each MAC layer device; it refers to a cell that performs synchronization by timing, performs random access, sends HARQ ACK / NACK feedback using PUCCH transmission resources, and exchanges most control signals. The technology in which a base station operates multiple Scells along with Spcells to increase transmission resources and enhance uplink or downlink data transmission resources is called Carrier Aggregation Technology.

[0105] When a terminal is configured with a Spcell and multiple Scells, it can configure a mode for each Scell. The Scell ​​modes described above may be configured as Active mode and Deactivated mode. In the Active mode, the terminal can exchange uplink or downlink data with the base station in the Active mode Scell ​​(or the active partial bandwidth of the Scell). Additionally, the terminal monitors the PDCCH to verify instructions from the base station, performs channel measurements for the downlink of the Active mode Scell ​​(or the active partial bandwidth of the Scell), and periodically reports the measurement information to the base station. Furthermore, the terminal can periodically transmit a Sounding Reference Signal (SRS) to the base station to enable the base station to perform uplink channel measurements.

[0106] However, in the above-mentioned deactivation mode, the terminal cannot exchange data with the base station in the Scell, does not monitor the PDCCH to verify instructions from the base station, does not perform channel measurements, does not perform measurement reports, and does not transmit pilot signals.

[0107] Therefore, in order to activate Scells in disabled mode, the base station may first set frequency measurement setting information to the terminal via an RRC message. The terminal performs cell or frequency measurement based on the frequency measurement setting information. Then, after receiving the terminal's cell or frequency measurement report, the base station may activate the disabled Scells based on the frequency / channel measurement information. As a result, a significant delay occurs in the base station activating carrier aggregation technology to the terminal.

[0109] In this invention, a dormant mode is proposed for the partial bandwidth of each Scell ​​to reduce the aforementioned delay and conserve the terminal's battery.

[0110] In the above dormant mode, the terminal cannot exchange data with the base station in the dormant bandwidth part (dormant BWP) of the SCell, and does not monitor the PDCCH to verify instructions from the base station. Additionally, the terminal does not transmit pilot signals but performs channel measurements and reports the measurement results for the measured frequency / cell / channel periodically or when an event occurs, according to the base station settings. Therefore, since the terminal does not monitor the PDCCH or transmit pilot signals in the dormant bandwidth part (BWP) of the Scell, it can save battery power compared to the active mode. Furthermore, unlike the inactive mode, since channel measurement reporting is performed, the base station can quickly activate the bandwidth part of the SCell based on the measurement report, thereby enabling the rapid use of carrier aggregation technology and reducing transmission delay.

[0112] Next-generation mobile communication systems can utilize very high frequency bands, allowing for extremely wide frequency bandwidths. However, supporting the entire bandwidth in terminal implementations requires high implementation complexity and incurs high costs. Therefore, the concept of Bandwidth Part (BWP) can be introduced in next-generation mobile communication systems. Specifically, multiple Bandwidth Part (BWP) sections can be configured within a single cell (Spcell or Scell), enabling data transmission and reception across one or more sections according to instructions from the base station.

[0113] The present invention is characterized by proposing a state transition method and specific operations that consider the state of the Scell ​​and a plurality of partial bandwidths set in the Scell ​​when introducing the dormancy mode proposed in the present invention. Furthermore, the invention proposes methods for managing the dormancy mode at the partial bandwidth unit (BWP-level) and transitioning the state, and proposes specific operations of the partial bandwidths according to each mode (activation, deactivation, or dormancy).

[0114] Furthermore, the present invention is characterized by the ability to set multiple partial bandwidths for each downlink or uplink in a single cell (Spcell, Pcell, Pscell, or Scell), and to set and operate active partial bandwidths (active DL or UL BWP), dormant partial bandwidths (dormant BWP or dormant DL BWP), or inactive partial bandwidths (inactive or deactivated DL / UL BWP) through partial bandwidth switching. That is, for the single cell, the data transmission rate can be increased in a manner similar to carrier aggregation technology by transitioning the downlink or uplink partial bandwidth to an active state. Additionally, battery consumption can be reduced by transitioning or switching the downlink partial bandwidth to a dormant partial bandwidth so that the terminal does not perform PDCCH monitoring for the cell. Furthermore, the terminal can support the activation of faster cells or partial bandwidths in the future by enabling channel measurement for the downlink partial bandwidth and reporting the channel measurement results. Additionally, the terminal's battery can be reduced by transitioning the downlink (or uplink) partial bandwidth in the single cell to an inactive state. As mentioned above, state transition instructions for each cell by partial bandwidth can be set and indicated via RRC messages or DCI (Downlink Control Information) of MAC CE or PDCCH.

[0115] In the present invention, partial bandwidth (BWP) can be used without distinguishing between uplink and downlink, and depending on the context, it may indicate uplink partial bandwidth and downlink partial bandwidth, respectively.

[0116] In the present invention, the term "link" may be used without distinguishing between an uplink and a downlink, and depending on the context, it may indicate an uplink and a downlink, respectively.

[0118] FIGS. 1ea and FIGS. 1eb are diagrams illustrating a procedure for providing services to a terminal using an extremely wide frequency bandwidth efficiently in a next-generation mobile communication system of the present invention.

[0119] Figures 1ea and 1eb explain how a next-generation mobile communication system efficiently uses a very wide frequency bandwidth to provide services to terminals with various different capabilities (or categories) and to save battery power.

[0120] A single cell provided by a base station can service a very wide frequency band, such as 1e-05. However, in order to provide service to terminals with different capabilities, the above wide frequency band can be divided into multiple partial bands to manage a single cell.

[0121] First, the terminal that is initially powered on can search the entire frequency band provided by the operator (PLMN) in fixed resource block units (e.g., in units of 12 RB (Resource block)). That is, the terminal can start searching for PSS (Primary synchronization sequence) / SSS (Secondary Synchronization Sequence) in the entire system bandwidth in the said resource block units (1e-10). If the signals are detected while searching for PSS / SSS (1e-01 or 1e-02) in the said resource block units, the signals can be read and interpreted (decoded) to identify the boundary between the subframe and the radio transmission resource frame (Radio frame). Thus, subframes can be distinguished in 1ms units, and the downlink signal is synchronized with the base station. In the above, the RB (Resource block) can be defined as a two-dimensional unit with a predetermined frequency resource and a predetermined time resource size. For example, the time resource can be defined as a unit of 1ms, and the frequency resource as 12 subcarriers (1 carrier x 15kHz = 180kHz). In the above, when the terminal completes synchronization, it checks the MIB (Master system Information block) or MSI (Minimum system information) to check the information of the CORESEST (Control Resource Set) and the information of the Initial access Bandwidth Part (BWP) (1e-15, 1e-20). In the above, the CORESET information refers to the location of the time / frequency transmission resource where the control signal is transmitted from the base station, and for example, indicates the location of the resource where the PDCCH channel is transmitted.That is, the above CORESET information is information indicating where the first system information (System information block 1, SIB1) is transmitted, and indicates which frequency / time resource the PDCCH is transmitted from. In the above, when the terminal reads the first system information, it can check information regarding the initial partial bandwidth (initial BWP). As described above, when the terminal completes synchronization of the downlink signal with the base station and is able to receive the control signal, the terminal can perform a random access procedure in the initial partial bandwidth (initial BWP) of the cell on which it camped, request an RRC connection setup, and perform an RRC connection setup by receiving an RRC message.

[0122] In the above RRC connection settings, multiple partial bandwidths may be set for each cell (Pcell or Pscell or Spcell or Scell). Within the above cell, multiple partial bandwidths may be set for the downlink, and separately, multiple partial bandwidths may be set for the uplink.

[0123] The above multiple partial bandwidths may be indicated and configured as partial bandwidth identifiers (BWP Identifiers) so that they can be used as initial partial bandwidths (initial BWP), default partial bandwidths (default BWP), or first active partial bandwidths (first active BWP).

[0124] In the above, the initial partial bandwidth (initial BWP) can be used as a cell-specific partial bandwidth that exists one per cell, and can be used as a partial bandwidth that allows a terminal connecting to the cell for the first time to establish a connection to the cell through a random access procedure, or a terminal that has established a connection to perform synchronization. Additionally, the base station can set the initial downlink partial bandwidth (initial downlink BWP) to be used in the downlink and the initial uplink partial bandwidth (initial uplink BWP) to be used in the uplink, respectively, for each cell. Furthermore, the configuration information for the initial partial bandwidth can be broadcast in the first system information (system information 1, SIB1) indicated by CORESET, and the base station can reconfigure it to the terminal that has connected via an RRC message. Additionally, the initial partial bandwidth can be used by designating it as Partband Identifier 0 for both the uplink and downlink. That is, all terminals connected to the same cell can use the same initial partial bandwidth by designating it as Partband Identifier 0. This is because, when performing a random access procedure, there may be an advantage in facilitating contention-based random access procedures, as the base station can be configured to transmit a Random Access Response (RAR) message within an initial partial bandwidth that all terminals can read.

[0125] As mentioned above, the first active BWP can be configured differently for each terminal (UE specific) and can be designated and indicated by a partial bandwidth identifier among multiple partial bandwidths. The first active BWP can be configured for the downlink and uplink respectively, and can be configured as the first active downlink BWP and first active uplink BWP, respectively, as partial bandwidth identifiers. The first active BWP can be used to indicate which partial bandwidth to activate and use first when multiple partial bandwidths are configured in a single cell. For example, when a terminal is configured with a Pcell or Pscell and multiple Scells, and multiple partial bandwidths are configured in each Pcell, Pscell, or Scell, if the Pcell, Pscell, or Scell ​​is activated, the terminal can activate and use the first active BWP among the multiple partial bandwidths configured in the Pcell, Pscell, or Scell. In other words, for the downlink, the first active downlink BWP can be activated and used, and for the uplink, the first active uplink BWP can be activated and used.

[0126] As described above, the operation of the terminal switching the downlink partial bandwidth of the Scell ​​to activate it as the initially active downlink partial bandwidth and switching the uplink partial bandwidth to activate it as the initially active uplink partial bandwidth can be performed when the Scell ​​or partial bandwidth receives an instruction via an RRC message, MAC control information, or DCI to activate it after being in an inactive state. Additionally, it can be performed when the Scell ​​or partial bandwidth receives an instruction via an RRC message, MAC control information, or DCI to transition to a sleep state. This is because, when activating the Scell ​​or partial bandwidth, the downlink partial bandwidth will inevitably be switched to activate it as the initially active downlink partial bandwidth and the uplink partial bandwidth will be switched to activate it as the initially active uplink partial bandwidth; therefore, when performing channel measurement reporting in the sleep state, the frequency / channel must be measured and reported for the aforementioned initially active downlink / uplink partial bandwidths in order for the base station to effectively utilize carrier aggregation technology.

[0127] As described above, the default BWP can be configured differently for each terminal (UE specific) and can be designated by a BWP identifier among multiple BWPs. The default BWP may be characterized as being configured only for the downlink. The default BWP can be used as the BWP to which the active BWP among multiple downlink BWPs will fall back after a certain period of time. For example, a BWP inactivity timer can be configured per cell or per BWP via an RRC message, and the timer may start or restart when data transmission or reception occurs in an active BWP other than the default BWP, or when the active BWP is switched to another BWP. When the timer expires, the terminal may fall back or switch the downlink BWP active in the cell to the default BWP. In the above, switching may refer to a procedure of deactivating a currently active partial bandwidth and activating a partial bandwidth for which switching is indicated, and switching may be triggered by an RRC message, MAC control information (MAC control element), or L1 signaling (Downlink Control Information (DCI) of PDCCH). In the above, switching may be triggered by indicating a partial bandwidth to be switched or activated, and the partial bandwidth may be indicated by a partial bandwidth identifier (e.g., 0 or 1 or 2 or 3 or 4).

[0128] The reason for applying the above basic partial bandwidth only to the downlink is that it facilitates base station scheduling by causing the terminal to fall back to the basic partial bandwidth after a certain period of time per cell, thereby allowing it to receive instructions from the base station (e.g., DCI of the PDCCH). For example, if the base station sets the basic partial bandwidth of terminals connected to a single cell as the initial partial bandwidth, the base station may continue to perform scheduling instructions only within the initial partial bandwidth after a certain period of time. If the above basic partial bandwidth is not set in the RRC message, the initial partial bandwidth may be considered as the basic partial bandwidth, and the terminal may fall back to the initial partial bandwidth upon the expiration of the partial bandwidth disable timer.

[0129] As another method to increase the implementation freedom of the base station, a default partial bandwidth can be defined and configured for the uplink as well, allowing it to be used like the default partial bandwidth of the downlink.

[0131] FIG. 1f illustrates a procedure for a terminal to switch from an RRC idle mode to an RRC connected mode in a next-generation mobile communication system of the present invention, and proposes a method for setting a plurality of bandwidth parts (BWP) and setting a default BWP or a first active BWP.

[0132] A single cell serviced by a base station can service a very wide frequency band. First, the terminal can search the entire frequency band provided by the operator (PLMN) in fixed resource block units (e.g., 12 RB (Resource block) units). That is, the terminal can start searching for PSS (Primary Synchronization Sequence) / SSS (Secondary Synchronization Sequence) within the entire system bandwidth in the aforementioned resource block units. If the terminal detects the signals while searching for PSS / SSS in the aforementioned resource block units, it can read and interpret (decode) the signals to identify the boundaries between the subframe and the radio frame. Once the terminal completes synchronization, it can read the system information of the cell it is currently camped on. That is, by checking the MIB (Master system Information block) or MSI (Minimum system information), the information of CORESEST (Control Resource Set) can be checked, and the system information can be read to check the Initial Bandwidth Part (BWP) information (1f-01, 1f-05). In the above, CORESET information refers to the location of the time / frequency transmission resource where the control signal is transmitted from the base station, and for example, indicates the location of the resource where the PDCCH channel is transmitted.

[0133] As described above, when the terminal completes synchronization of downlink signals with the base station and is able to receive control signals, the terminal can perform a random access procedure in the initial partial bandwidth, receive a random access response, request RRC connection setup, and receive an RRC message to perform RRC connection setup (1f-10, 1f-15, 1f-20, 1f-25, 1f-30).

[0134] Once the basic RRC connection setup described above is completed, the base station may send an RRC message to the terminal to inquire about the terminal's capability (UECapabilityEnquiry, 1f-35) in order to verify the terminal's capability. Alternatively, the base station may inquire about the terminal's capability from the MME or AMF to verify the terminal's capability. This is because if the terminal has previously been connected, the MME or AMF may have stored the terminal's capability information. If the desired terminal capability information is not available, the base station may request the terminal capability from the terminal.

[0135] The reason the base station sends an RRC message to the terminal to check the terminal's performance is to verify the terminal's performance, for example, to determine how much of a frequency band the terminal can read or to identify the range of frequency bands it can read. After verifying the terminal's performance, the base station can set an appropriate partial bandwidth (BWP) for the terminal. When the terminal receives the RRC message inquiring about the terminal's performance, it may, in response, indicate the range of bandwidth supported by the terminal or the range of bandwidth supported from the current system bandwidth by an offset from the reference center frequency, directly indicate the start and end points of the supported frequency bandwidth, or indicate the center frequency and bandwidth (1f-40).

[0137] In the above, partial bandwidths can be configured via the RRCSetup message, RRCResume message (1f-25), or RRCReconfiguration message (1f-45) of the RRC connection configuration. The RRC message may include configuration information for a PCell, a Pscell, or multiple Scells, and multiple partial bandwidths can be configured for each cell (PCell, Pscell, or Scell). When configuring multiple partial bandwidths for each cell, multiple partial bandwidths to be used in the downlink of each cell can be configured. In the case of an FDD system, multiple partial bandwidths to be used in the uplink of each cell can be configured separately from the downlink partial bandwidths. In the case of a TDD system, multiple partial bandwidths to be used in common in the downlink and uplink of each cell can be configured.

[0138] The information for setting partial bandwidth of each of the above cells (PCell or Pscell or Scell) may include some of the following information.

[0139] - Downlink portion bandwidth setting information of the above cell

[0140] ■ Initial Downlink Bandwidth (initial downlink BWP) Configuration Information

[0141] ■ Multiple partial bandwidth setting information and partial bandwidth identifiers (BWP IDs) corresponding to each partial bandwidth

[0142] ■ Initial state setting information for the downlink portion bandwidth of the above cell (e.g., active state, dormant state, or inactive state)

[0143] ■ Partband identifier indicating the first active downlink partband (first active downlink BWP)

[0144] ■ Partband identifier indicating the default partband (default BWP)

[0145] ■ Configuration information for PDCCH monitoring for each partial bandwidth. For example, CORESET information, Search Space resource information, or PDCCH transmission resource, period, subframe number information, etc.

[0146] ■ A partial bandwidth identifier indicating a dormant partial bandwidth, or a 1-bit indicator indicating a dormant partial bandwidth for each partial bandwidth in the above partial bandwidth setting information

[0147] ■ Partial Bandwidth Disable Timer Settings and Timer Values

[0148] - Uplink portion bandwidth setting information of the above cell

[0149] ■ Initial Uplink Bandwidth (initial uplink BWP) Configuration Information

[0150] ■ Multiple partial bandwidth setting information and partial bandwidth identifiers (BWP IDs) corresponding to each partial bandwidth

[0151] ■ Initial state setting information for the downlink portion bandwidth of the above cell (e.g., active state, dormant state, or inactive state)

[0152] ■ A partial bandwidth identifier indicating a dormant partial bandwidth, or a 1-bit indicator indicating a dormant partial bandwidth for each partial bandwidth in the above partial bandwidth setting information

[0153] ■ Partband identifier indicating the first active uplink partband (first active uplink BWP)

[0155] The initial partial bandwidth (initial BWP), default partial bandwidth (default BWP), or first active partial bandwidth (first active BWP) set above may be used for the following purposes and may operate as follows to suit those purposes.

[0156] In the above, the initial partial bandwidth (initial BWP) can be used as a cell-specific partial bandwidth that exists one per cell, and can be used as a partial bandwidth that allows a terminal connecting to the cell for the first time to establish a connection to the cell through a random access procedure, or a terminal that has established a connection to perform synchronization. Additionally, the base station can set the initial downlink partial bandwidth (initial downlink BWP) to be used in the downlink and the initial uplink partial bandwidth (initial uplink BWP) to be used in the uplink, respectively, for each cell. Furthermore, the configuration information for the initial partial bandwidth can be broadcast in the first system information (system information 1, SIB1) indicated by CORESET, and the base station can reconfigure it to the terminal that has connected via an RRC message. Additionally, the initial partial bandwidth can be used by designating it as Partband Identifier 0 for both the uplink and downlink. That is, all terminals connected to the same cell can use the same initial partial bandwidth by designating it as Partband Identifier 0. This is because, when performing a random access procedure, there may be an advantage in facilitating contention-based random access procedures, as the base station can be configured to transmit a Random Access Response (RAR) message within an initial partial bandwidth that all terminals can read.

[0157] As mentioned above, the first active BWP can be configured differently for each terminal (UE specific) and can be designated and indicated by a partial bandwidth identifier among multiple partial bandwidths. The first active BWP can be configured for the downlink and uplink respectively, and can be configured as the first active downlink BWP and first active uplink BWP, respectively, as partial bandwidth identifiers. The first active BWP can be used to indicate which partial bandwidth to activate and use first when multiple partial bandwidths are configured in a single cell. For example, when a terminal is configured with a Pcell or Pscell and multiple Scells, and multiple partial bandwidths are configured in each Pcell, Pscell, or Scell, if the Pcell, Pscell, or Scell ​​is activated, the terminal can activate and use the first active BWP among the multiple partial bandwidths configured in the Pcell, Pscell, or Scell. In other words, for the downlink, the first active downlink BWP can be activated and used, and for the uplink, the first active uplink BWP can be activated and used.

[0158] The operation described above, in which the terminal switches the downlink partial bandwidth for an Scell ​​to activate it as the initially active downlink partial bandwidth and switches the uplink partial bandwidth to activate it as the initially active uplink partial bandwidth, can be performed when an instruction is received to activate an Scell ​​or a partial bandwidth of an Scell ​​that is in a disabled or dormant state, or when an instruction is received via an RRC message, MAC control information, or DCI to switch from a disabled or dormant partial bandwidth to an active partial bandwidth. Additionally, when an instruction is received via an RRC message, MAC control information, or DCI to transition an Scell ​​or partial bandwidth to a dormant state or to switch to a dormant partial bandwidth, the partial bandwidth may be switched to a dormant partial bandwidth or the partial bandwidth may be put into a dormant state. In the above, "dormant state" may mean performing the proposed operation while in a dormant state. That is, 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 may be performed. In another way, when activating the aforementioned Scell ​​or partial bandwidth, since the downlink partial bandwidth will be switched to activate the initially activated downlink partial bandwidth and the uplink partial bandwidth will be switched to activate the initially activated uplink partial bandwidth anyway, the base station must measure and report the frequency / channel for the aforementioned initially activated downlink / uplink partial bandwidth when performing channel measurement reports, even when instructed to enter a sleep state or to switch to the sleep partial bandwidth, so that the base station can effectively use carrier aggregation technology.

[0159] As described above, the default BWP can be configured differently for each terminal (UE specific) and can be designated by a BWP identifier among multiple BWPs. The default BWP may be characterized as being configured only for the downlink. The default BWP can be used as the BWP to which the active BWP among multiple downlink BWPs will fall back after a certain period of time. For example, a BWP inactivity timer can be configured per cell or per BWP via an RRC message, and the timer may start or restart when data transmission or reception occurs in an active BWP other than the default BWP, or when the active BWP is switched to another BWP. When the timer expires, the terminal may fall back or switch the downlink BWP active in the cell to the default BWP. In the above, switching may refer to a procedure of deactivating a currently active partial bandwidth and activating a partial bandwidth for which switching is indicated, and switching may be triggered by an RRC message, MAC control information (MAC control element), or L1 signaling (Downlink Control Information (DCI) of PDCCH). In the above, switching may be triggered by indicating a partial bandwidth to be switched or activated, and the partial bandwidth may be indicated by a partial bandwidth identifier (e.g., 0 or 1 or 2 or 3 or 4).

[0160] The reason for applying the above basic partial bandwidth only to the downlink is that it facilitates base station scheduling by causing the terminal to fall back to the basic partial bandwidth after a certain period of time per cell, thereby allowing it to receive instructions from the base station (e.g., DCI of the PDCCH). For example, if the base station sets the basic partial bandwidth of terminals connected to a single cell as the initial partial bandwidth, the base station may continue to perform scheduling instructions only within the initial partial bandwidth after a certain period of time. If the above basic partial bandwidth is not set in the RRC message, the initial partial bandwidth may be considered as the basic partial bandwidth, and the terminal may fall back to the initial partial bandwidth upon the expiration of the partial bandwidth disable timer.

[0161] As another method to increase the implementation freedom of the base station, a default partial bandwidth can be defined and configured for the uplink as well, allowing it to be used like the default partial bandwidth of the downlink.

[0163] In addition, in the RRCSetup message or RRCResume message (1f-25) or RRCReconfiguration message (1f-45) of the RRC connection setup described above, a state transition timer may be set so that the terminal can perform a state transition on its own even if it does not receive an RRC message or MAC control information or instructions from the base station due to the DCI of the PDCCH. For example, a cell deactivation timer may be set for each Scell, and when the cell deactivation timer expires, the Scell ​​may be transitioned to a deactivated state. Alternatively, a downlink (or uplink) partial bandwidth hibernation timer (DLBWPHibernationTimer or ULBWPHibernationTimer) may be set for each partial bandwidth, and a cell hibernation timer may be set for each Scell, so that when the cell hibernation timer or downlink (or uplink) partial bandwidth hibernation timer expires, the Scell ​​or downlink (or uplink) partial bandwidth may be transitioned to a hibernation state or switched to a hibernation partial bandwidth. For example, when the cell sleep timer or downlink (or uplink) partial bandwidth sleep timer expires, the Scell ​​or downlink (or uplink) partial bandwidth that was in an active state is transitioned to a sleep state or switched to a sleep partial bandwidth, and the Scell ​​or downlink (or uplink) partial bandwidth that was in an inactive state or a sleep state is not transitioned to a sleep state or a sleep partial bandwidth.Additionally, for each Scell ​​or downlink (or uplink) partial bandwidth, a dormant cell deactivation timer (dormantScellDeactivationTimer) or a dormant or downlink (or uplink) dormant partial bandwidth deactivation timer (dormantDLDeactivationTimer or dormantULDeactivationTimer) can be set to transition the Scell ​​or downlink (or uplink) dormant partial bandwidth that is in a dormant state to a deactivated state. When the dormant cell deactivation timer or the dormant or downlink (or uplink) dormant partial bandwidth deactivation timer expires, only the Scell ​​or downlink (or uplink) dormant partial bandwidth that was in a dormant state is transitioned to a deactivated state, and the Scell ​​or downlink (or uplink) partial bandwidth that was in an active state or a deactivated state is not transitioned to a deactivated state. If the Cell Deactivation Timer (or downlink (or uplink) partial bandwidth hibernation timer) and the Cell Hibernation Timer (or downlink (or uplink) hibernation partial bandwidth deactivation timer) are set together as described above, the Cell Hibernation Timer (or downlink (or uplink) hibernation partial bandwidth hibernation timer) may be prioritized. That is, if the Cell Hibernation Timer (or downlink (or uplink) partial bandwidth hibernation timer) is set, the corresponding Scell ​​or downlink (or uplink) partial bandwidth is not deactivated even if the Cell Deactivation Timer (or downlink (or uplink) hibernation partial bandwidth deactivation timer) expires.In other words, when a cell sleep timer (or downlink (or uplink) partial bandwidth sleep timer) is set, the Scell ​​or downlink (or uplink) partial bandwidth is first transitioned from an active state to a sleep state or switched to a sleep partial bandwidth upon the expiration of the timer, and the cell or partial bandwidth that has transitioned to the sleep state is then transitioned in stages back to the deactivated state upon the expiration of the sleep state cell or partial bandwidth deactivation timer. Accordingly, when a cell sleep timer or partial bandwidth sleep timer is set, the cell deactivation timer or sleep partial bandwidth deactivation timer does not affect the state transition of the Scell ​​or downlink (or uplink) partial bandwidth, and even if the cell deactivation timer or sleep partial bandwidth deactivation timer expires, the Scell ​​or downlink (or uplink) partial bandwidth is not immediately transitioned to the deactivated state if the cell sleep timer or partial bandwidth sleep timer is set.

[0164] In the above RRC message, if the cell disable timer (or downlink (or uplink) partial bandwidth sleep timer) is not set, the terminal may consider that the cell disable timer (or downlink (or uplink) partial bandwidth sleep timer) is set to an infinite value.

[0166] In addition, the RRCSetup message or RRCResume message (1f-25) or RRCReconfiguration message (1f-45) of the RRC connection settings above may set measurement configuration information and measurement gap information, and may include measurement object information. The frequency measurement reporting object may include partial bandwidth information where the measurement RS (Reference Signal) / SS (Synchronization Signal) is set, and may include a center frequency, a bandwidth corresponding to the partial bandwidth, and a time pattern to be applied when measuring. The measurement reporting gap information may include measurement gap length corresponding to how long the measurement will be performed, a measurement gap period, and measurement gap start time information. In the above, RS refers to a signal from a base station that is transmitted with a partial time / frequency pattern in the transmission resource of a subframe in which a control signal or data signal is transmitted, and can be used to determine the signal strength of the corresponding partial bandwidth or the corresponding cell. The SS signal is a synchronization signal transmitted periodically, such as PSS or SSS, and can also be used to determine the signal strength of the corresponding partial bandwidth or the corresponding cell.

[0167] In addition, the RRCSetup message or RRCResume message (1f-25) or RRCReconfiguration message (1f-45) of the RRC connection setup above may include scheduling information for each cell.

[0168] The scheduling information for each cell mentioned above may include some of the following information.

[0169] - Cross-carrier scheduling settings information

[0170] ■ Scheduling Cell Information

[0171] ◆ Own indicator (indicating that it is not cross-carrier scheduling, i.e., self-scheduling) and CIF (Carrier Indicator Field) indicator (cif-Presence, indicating whether the CIF field exists in the DCI format of the PDCCH)

[0172] ◆ Other indicator (indicating that it is cross-carrier scheduling), a cell identifier (schedulingCellId, ServCellIndex) indicating which cell will receive the cross-carrier scheduling, and a CIF identifier (cif-InSchedulingCell) to distinguish the cell being scheduled or the cell targeted for scheduling from the cell receiving the scheduling.

[0173] ◆ Sleep Part Bandwidth Identifier or Sleep Part Bandwidth Setting Indicator (an indicator or setting information indicating that sleep part bandwidth is set in the current cell, and that when sleep part bandwidth is used or when switching to sleep part bandwidth (BWP switching), scheduling or part bandwidth switching instructions will be received from other cells via cross-carrier scheduling)

[0175] Once the RRC connection setup is completed as described above, the terminal can configure multiple partial bandwidths according to instructions set in the RRC message. Furthermore, to conserve battery power, one or fewer of the configured partial bandwidths can be activated. For example, a single partial bandwidth to be activated can be specified. The base station can then instruct the activation of the partial bandwidth via RRC messages, MAC control information (MAC CE), or L1 signaling (PHY layer control signals such as PDCCH) (for example, bitmap information can be used to indicate activation or deactivation), thereby instructing a switch from the initial connection partial bandwidth to a new partial bandwidth. Since there may be many other newly connected users in the initial connection partial bandwidth, it may be much more advantageous from a scheduling perspective to allocate a new partial bandwidth and manage connected users separately. This is because the initial connection partial bandwidth is not configured per terminal but can be shared and used by all terminals in common. Additionally, a default partial bandwidth can be dynamically specified via the MAC control information, L1 signaling, or system information (to reduce signaling overhead).

[0177] In the following of the present invention, a dormant partial bandwidth is newly proposed in a next-generation mobile communication system, and a method is proposed to support three state transitions for the partial bandwidth.

[0178] FIG. 1g is a diagram showing the state transition procedure for each partial bandwidth proposed in the present invention.

[0179] As shown in Fig. 1g, the partial bandwidth of each cell of the terminal may have an active state (1g-01), an inactive state (1g-03), or a dormant state (1g-02), and may perform a state transition due to setting information of an RRC message, MAC control information, or instructions by the DCI of the PDCCH.

[0180] The partial bandwidth-specific state transition operation (activation, deactivation, or dormancy) of the Scell ​​proposed in the present invention can be performed in the following cases.

[0181] - It may be characterized by the fact that when the partial bandwidth state of the Scell ​​is set by an RRC message, or when the partial bandwidth of each SCell is set by an RRC message and a sleep partial bandwidth is set for the SCell, the SCell is started by switching to the sleep partial bandwidth and operations are performed in the sleep partial bandwidth.

[0182] - If Scell ​​activation, deactivation, or dormancy MAC CE is received,

[0183] - If you receive a Partial Bandwidth Enable, Disable, or Sleep MAC CE,

[0184] - If the cell sleep timer is not set for the active Scell ​​and the set cell inactive timer has expired,

[0185] - If a partial bandwidth sleep timer is not set for the active partial bandwidth, and the set partial bandwidth state deactivation timer (e.g., bwpDeactivatedTimer) has expired,

[0186] - When the cell sleep timer set in the active state Scell ​​expires,

[0187] - When the partial bandwidth sleep timer set in the active partial bandwidth expires,

[0188] - When the sleep state Scell ​​disable timer set on the sleep state Scell ​​expires,

[0189] - When the dormant BWPDeactivatedTimer set for the dormant BWPDeactivatedTimer expires,

[0191] In addition, the state transition operation proposed in the present invention may have the following characteristics.

[0192] - The Spcell (Pcell or Pscell) (or the downlink partial bandwidth or uplink partial bandwidth of the cell) is characterized by being unable to transition to a sleep state and always remaining active. Since the Spcell is responsible for synchronization and the transmission and reception of key control signals, it must always remain active because the connection with the base station is severed if the Spcell becomes sleepy or deactivated.

[0193] - It is characterized by the fact that it cannot transition to a sleep state even if it is a partial bandwidth of Scell ​​or SCell, but if PUCCH is set. It must remain active because there may be other cells that need to send feedback, such as HARQ ACK / NACK, via PUCCH.

[0194] Due to the above characteristics, the Cell Deactivation Timer is not applied to Spcell or the partial bandwidth of Spcell and the partial bandwidth of Scell ​​or SCell where PUCCH is set, and can only be operated for other Scells.

[0195] - The Cell Hibernation Timer takes precedence over the Cell Deactivation Timer. Also, if a single timer value is set via an RRC message, the same value can be applied to all cells. Alternatively, the base station may set different timer values ​​for each Scell ​​or BWP by considering the characteristics of each Scell ​​or BWP.

[0196] - Scell ​​or partial bandwidth may be characterized as operating in a disabled state by default initially unless indicated as enabled or dormant in an RRC message.

[0198] In the present invention, the uplink may indicate an uplink partial bandwidth, and the downlink may indicate a downlink partial bandwidth. This is because only one active or dormant partial bandwidth can be operated per uplink or downlink.

[0199] In the following part of the present invention, a method for operating state transitions at the bandwidth part-level proposed above is specifically proposed to enable rapid activation of carrier aggregation technology and to reduce the battery consumption of the terminal.

[0200] In the present invention, partial bandwidths can be configured per cell in the RRCSetup message, RRCReconfiguration message, or RRCResume message as described in FIG. 1f. The RRC message may include configuration information for a PCell, a Pscell, or a plurality of Scells, and may configure a plurality of partial bandwidths for each cell (PCell, Pscell, or Scell). When configuring a plurality of partial bandwidths for each cell in the RRC message, a plurality of partial bandwidths to be used in the downlink of each cell may be configured; in the case of an FDD system, a plurality of partial bandwidths to be used in the uplink of each cell may be configured separately from the downlink partial bandwidths. In the case of a TDD system, a plurality of partial bandwidths to be used commonly in the downlink and uplink of each cell may be configured.

[0201] The first method of the information setting method for setting partial bandwidth of each cell (PCell or Pscell or Scell) described above includes one or more of the following information and can introduce a new indicator to the partial bandwidth to indicate whether each partial bandwidth is a general partial bandwidth (e.g., a partial bandwidth that can be operated or set in an active or inactive state) or a dormant partial bandwidth (e.g., a partial bandwidth that can be operated or set in a dormant state). For example, a partial bandwidth identifier can be used to indicate whether or not it is a dormant partial bandwidth.

[0202] - Downlink bandwidth setting information for each cell

[0203] ■ Initial Downlink Bandwidth (initial downlink BWP) Configuration Information

[0204] ■ Multiple partial bandwidth setting information and partial bandwidth identifiers (BWP IDs) corresponding to each partial bandwidth

[0205] ■ Information on the initial state setting of the downlink of the above cell (e.g., active state, dormant state, or inactive state)

[0206] ■ Partband identifier indicating the first active downlink partband (first active downlink BWP)

[0207] ■ Partband identifier indicating the default partband (default BWP)

[0208] ■ A partial bandwidth identifier indicating a dormant partial bandwidth, or a 1-bit indicator indicating a dormant partial bandwidth for each partial bandwidth in the above partial bandwidth setting information

[0209] ■ Partial Bandwidth Disable Timer Settings and Timer Values

[0211] - Uplink bandwidth setting information for each cell

[0212] ■ Initial Uplink Bandwidth (initial uplink BWP) Configuration Information

[0213] ■ Multiple partial bandwidth setting information and partial bandwidth identifiers (BWP IDs) corresponding to each partial bandwidth

[0214] ■ Information on the initial state setting of the uplink of the above cell (e.g., active state, dormant state, or inactive state)

[0215] ■ Partband identifier indicating the first active uplink partband (first active uplink BWP)

[0216] ■ A partial bandwidth identifier indicating a dormant partial bandwidth, or a 1-bit indicator indicating a dormant partial bandwidth for each partial bandwidth in the above partial bandwidth setting information

[0218] As another method for setting information for setting partial bandwidth of each cell (PCell or Pscell or Scell) above, the second method may distinguish between the partial bandwidth corresponding to the dormant partial bandwidth by not setting the configuration information required to read the PDCCH (e.g., Search space, PDCCH transmission resources, period, etc.) (or, as another method, the period may be set very long along with other configuration information), and the general partial bandwidth by setting the configuration information required to read the PDCCH (e.g., Search space, PDCCH transmission resources, period, etc.). This is because the dormant partial bandwidth is a partial bandwidth intended to reduce the battery consumption of the terminal by not reading the PDCCH, perform channel measurement, and report the channel measurement results to the PCell, thereby enabling the activation of the fast partial bandwidth or cell and allowing the allocation of fast uplink or downlink transmission resources. Accordingly, in the present invention, the term "dormant partial bandwidth" may refer to a partial bandwidth in which configuration information for PDCCH monitoring (e.g., Search space, PDCCH transmission resources, period, etc.) is not configured, or it may refer to a partial bandwidth indicated by a dormant partial bandwidth identifier, or a partial bandwidth in which configuration information for PDCCH monitoring is configured but configured to monitor with a very long period.In another way, the dormant partial bandwidth in the present invention may be configured such that PDCCH transmission resources, periods, etc. are not configured in the configuration information for PDCCH monitoring, thereby preventing PDCCH monitoring from being performed in the cell where the dormant partial bandwidth is configured, but Search space information or cross-carrier scheduling configuration information is configured so that switching or instructions regarding the dormant partial bandwidth can be received from other cells via cross-carrier scheduling. Since data transmission and reception are impossible in the dormant partial bandwidth, it may be characterized in that only PDCCH configuration information (PDCCH-config) is configured (e.g., only Search space information is configured) for the dormant partial bandwidth (or the first partial bandwidth). On the other hand, in the general partial bandwidth (or second partial bandwidth) rather than the dormant partial bandwidth, PDCCH monitoring must be performed and data transmission and reception must also be possible, so PDCCH configuration information (e.g., CORESET configuration information or Search space configuration information or PDCCH transmission resource or period, etc.) and PDSCH configuration information or PUSCH configuration information or random access related configuration information may be further configured.

[0219] Therefore, as described above, general uplink or downlink partial bandwidths must be set for each cell; however, dormant partial bandwidths may or may not be set for each cell, and the setting can be left to the base station implementation according to its purpose. Additionally, depending on the base station implementation, the initial active partial bandwidth, basic partial bandwidth, or initial partial bandwidth may be set as the dormant partial bandwidth.

[0220] In the above-mentioned dormant partial bandwidth, the terminal cannot exchange data with the base station, does not monitor the PDCCH to verify instructions from the base station, and does not transmit pilot signals, but performs channel measurements and reports the measurement results for the measured frequency / cell / channel periodically or when an event occurs, according to the base station settings. Therefore, since the terminal does not monitor the PDCCH or transmit pilot signals in the above-mentioned dormant partial bandwidth, it can save battery power compared to the active mode. Furthermore, unlike the inactive mode, because it performs channel measurement reporting, the base station can utilize carrier aggregation technology by rapidly activating the cell where the dormant partial bandwidth is set based on the measurement report of the above-mentioned dormant partial bandwidth. Additionally, in the present invention, the dormant partial bandwidth may be characterized as being set in the downlink partial bandwidth setting information and being used only for the downlink partial bandwidth.

[0222] In the present invention, the terminal operation for the dormant Band Width Part (dormant BWP) is as follows.

[0223] - If the terminal is instructed to operate with a sleep partial bandwidth for the serving cell (PCell or SCell), or if an instruction to put the partial bandwidth (e.g., downlink partial bandwidth) of the current cell (PCell or SCell) or the cell into sleep is received via the DCI (L1 control signal) or MAC CE or RRC message of the PDCCH, or if an instruction to switch the partial bandwidth (e.g., downlink partial bandwidth) to a sleep partial bandwidth is received via the DCI (L1 control signal) or MAC CE or RRC message of the PDCCH (in the case where the instruction is received via the L1 control signal of the PDCCH above, the instruction may be received from the PDCCH of its own cell via self-scheduling, or the instruction may be received from the PDCCH for the cell in the PCell via cross-carrier scheduling), or if a partial bandwidth sleep timer was set and the timer has expired, one or more of the following operations may be performed.

[0224] ■ Switch to the uplink or downlink partial bandwidth indicated above or a designated partial bandwidth (e.g., a sleep partial bandwidth), and put the said partial bandwidth into sleep mode.

[0225] ■ Stop the cell disable timer that is set or running in the above cell or partial bandwidth.

[0226] ■ If the partial bandwidth sleep timer is set to the partial bandwidth of the above cell, stop the partial bandwidth sleep timer.

[0227] ■ Start or restart the sleep state partial bandwidth disable timer in the partial bandwidth of the above cell.

[0228] ■ Stop the partial bandwidth disable timer set for the partial bandwidth of the above cell. This is to prevent unnecessary partial bandwidth switching procedures in the above cell.

[0229] ■ Periodic downlink assignment resources (DL SPS or configured downlink assignment) or periodic uplink assignment resources (UL SPS or configured uplink grant Type 2) configured in the partial bandwidth of the cell above can be cleared. The meaning of "clearing" above is that while the terminal stores configuration information, such as period information set in the RRC message, the information regarding periodic assignment resources indicated or activated by L1 signaling (e.g., DCI) is removed and no longer used. The method proposed above, that is, the operation of clearing periodic downlink assignment resources (DL SPS or configured downlink assignment) or periodic uplink assignment resources (UL SPS or configured uplink grant), may be performed only when the partial bandwidth transitions from an active state to a dormant state. This is because when the partial bandwidth transitions from an inactive state to a dormant state, there is no information regarding periodic assignment resources indicated or activated by L1 signaling. Alternatively, the periodic transmission resources can be released only when the periodic downlink transmission resources or periodic uplink transmission resources are set or are set and in use.

[0230] ■ The periodic uplink transmission resource (configured uplink grant Type 1 configured via RRC) set in the partial bandwidth of the cell above can be suspended. The meaning of "suspending" above is that the terminal stores the transmission resource configuration information set in the RRC message but no longer uses it. The method proposed above, that is, the operation of suspending the configured periodic uplink transmission resource (configured uplink grant Type 1), may be performed only when the partial bandwidth transitions from an active state to a dormant state. This is because when the partial bandwidth transitions from an inactive state to a dormant state, the periodic transmission resource is not being used. Alternatively, the periodic transmission resources may be released only when the periodic downlink transmission resource or the periodic uplink transmission resource is configured or is configured and in use.

[0231] ■ Clear all HARQ buffers set in the above uplink or downlink partial bandwidth.

[0232] ■ The terminal does not transmit SRS for the uplink portion bandwidth of the above cell.

[0233] ■ In the partial bandwidth of the cell above, the terminal performs channel measurements (such as CSI, CQI, PMI, RI, PTI, or CRI) for the downlink according to the base station's settings and performs measurement reports. For example, channel or frequency measurement reports may be performed periodically.

[0234] ■ Uplink data is not transmitted via UL-SCH in the partial bandwidth of the above cell.

[0235] ■ Random access procedures are not performed on the partial bandwidth of the above cell.

[0236] ■ In the partial bandwidth of the above cell, the terminal does not monitor the PDCCH.

[0237] ■ The terminal does not monitor the PDCCH for the partial bandwidth of the cell. However, in the case of cross-scheduling, the scheduled cell (e.g., PCell) may monitor the PDCCH for the cell (e.g., SCell) and receive instructions.

[0238] ■ PUCCH or SPUCCH transmission is not performed within the partial bandwidth of the above cell.

[0239] ■ As mentioned above, the downlink partial bandwidth may be put into dormancy to perform and report channel measurements, while the uplink partial bandwidth of the cell may be deactivated and not used. This is because in the dormant Scell, channel measurements are performed only on the downlink partial bandwidth, and the measurement results are reported as the uplink partial bandwidth of the Spcell (Pcell or Pscell) or the Scell ​​containing the PUCCH.

[0240] If, as mentioned above, switching to a sleep partial bandwidth is instructed for the downlink or sleep is instructed for the partial bandwidth, the random access procedure can proceed without being canceled. This is because when performing the random access procedure, the Scell ​​sends a preamble to the uplink and receives a random access response to the Pcell's downlink. Therefore, even if the downlink partial bandwidth is put into sleep or switched to a sleep bandwidth, no problem occurs.

[0241] In the present invention, the terminal operation for the active Band Width Part (active BWP) is as follows.

[0242] - If a partial bandwidth (e.g., downlink partial bandwidth) of the current cell (PCell or SCell) or an instruction to activate said cell is received via the DCI (L1 control signal) or MAC CE or RRC message of the PDCCH, or if an instruction to switch the partial bandwidth (e.g., downlink partial bandwidth) to the active partial bandwidth (or partial bandwidth other than the dormant partial bandwidth) is received via the DCI (L1 control signal) or MAC CE or RRC message of the PDCCH (in the case where the instruction is received via the L1 control signal of the PDCCH above, the instruction may be received from the PDCCH of its own cell via self-scheduling, or the instruction may be received from the PDCCH for said cell in the PCell via cross-carrier scheduling), one or more of the following operations may be performed.

[0243] ■ Switch to and activate the uplink or downlink partial bandwidth indicated above. Alternatively, switch the uplink or downlink partial bandwidth to a specified partial bandwidth (e.g., uplink or uplink initial activation partial bandwidth) and activate the said partial bandwidth.

[0244] ■ A Sounding Reference Signal (SRS) is transmitted within the above-mentioned activated partial bandwidth to enable the base station to perform channel measurements for the uplink. For example, it can be transmitted periodically.

[0245] ■ If PUCCH is configured in the above-mentioned activated partial bandwidth, perform PUCCH transmission.

[0246] ■ Regarding the above, the partial bandwidth or cell deactivation timer is started or restarted. Alternatively, the partial bandwidth or cell deactivation timer may be started or restarted only if the partial bandwidth or cell sleep timer is not set. In the above, if the partial bandwidth or cell sleep timer can be set via an RRC message, the partial bandwidth or cell may be put into sleep upon the expiration of the timer. For example, the partial bandwidth or cell deactivation timer may be started or restarted only in the sleep partial bandwidth or cell.

[0247] ■ If there is a Type 1 configured transmission resource that has been deactivated, the stored Type 1 transmission resource can be initialized to its original configuration and used. In the above, the Type 1 configured transmission resource refers to a periodic transmission resource (uplink or downlink) that is pre-allocated via an RRC message and can be activated and used via an RRC message.

[0248] ■ Trigger PHR for the above partial bandwidth.

[0249] ■ In the above-mentioned activated partial bandwidth, the terminal may report channel measurement results (such as CSI, CQI, PMI, RI, PTI, or CRI) for the downlink according to the base station settings.

[0250] ■ Monitor the PDCCH to read instructions from the base station in the above-mentioned activated partial bandwidth.

[0251] ■ Monitor PDCCH to read cross-scheduling for the above-mentioned activated partial bandwidth.

[0252] ■ The partial bandwidth disable timer is started or restarted as described above. Alternatively, the partial bandwidth disable timer may be started or restarted only if the partial bandwidth sleep timer is not set. If the partial bandwidth sleep timer described above can be set via an RRC message, the partial bandwidth may be switched to a sleep state or a sleep partial bandwidth upon the timer's expiration. For example, the partial bandwidth disable timer may be started or restarted only in the sleep partial bandwidth.

[0253] ■ If a link partial bandwidth sleep timer is set for the above partial bandwidth,

[0254] ◆ Start or restart the partial bandwidth sleep timer for the above partial bandwidth.

[0256] In the present invention, the terminal operation for the inactive band width part (active BWP) is as follows.

[0257] - If an instruction to disable the partial bandwidth (e.g., downlink partial bandwidth) of the current cell (PCell or SCell) or to disable said cell is received via the DCI (L1 control signal) or MAC CE or RRC message of the PDCCH, or if an instruction to disable the partial bandwidth (e.g., downlink partial bandwidth) or to switch to the disabled partial bandwidth is received via the DCI (L1 control signal) or MAC CE or RRC message of the PDCCH (in the case where the instruction is received via the L1 control signal of the PDCCH above, the instruction may be received from the PDCCH of its own cell via self-scheduling, or the instruction may be received from the PDCCH for said cell in the PCell via cross-carrier scheduling), or if the partial bandwidth or cell disable timer in said cell has expired, one or more of the following operations may be performed.

[0258] ■ Disable the uplink or downlink portion bandwidth of the cell or indicated above.

[0259] ■ The terminal stops the partial bandwidth disable timer (e.g., disable timer for downlink partial bandwidth) that is set and running in the cell or partial bandwidth.

[0260] ■ Periodic downlink assignment resources (DL SPS or configured downlink assignment) or periodic uplink assignment resources (UL SPS or configured uplink grant Type 2) configured in the cell or partial bandwidth can be cleared. The meaning of "clearing" above is that while the terminal stores configuration information, such as period information set in the RRC message, the information regarding periodic assignment resources indicated by L1 signaling (e.g., DCI) or activated is removed and is no longer used. The periodic assignment resources can be referred to as Type 2 configured assignment resources. Furthermore, the operation of clearing the periodic assignment resources above may be performed only when the Scell ​​transitions from an active state to an inactive state. This is because when transitioning from a dormant state to an inactive state, there is no need for a clearing operation since there were no periodic assignment resources in the dormant state. Alternatively, the periodic assignment resources may be cleared only when the periodic downlink assignment resources or periodic uplink assignment resources are configured or are configured and in use.

[0261] ■ The periodic uplink transmission resource (configured uplink grant Type 1 configured via RRC) set in the cell or partial bandwidth above may be suspended. The meaning of "suspending" above is that the terminal stores the transmission resource configuration information set in the RRC message but no longer uses it. The periodic transmission resource above may be referred to as a Type 1 configured transmission resource. Furthermore, the operation of releasing the periodic transmission resource above may be performed only when the Scell ​​transitions from an active state to an inactive state. This is because when transitioning from a dormant state to an inactive state, there is no need for a release operation since there was no periodic transmission resource in the dormant state. Alternatively, the periodic transmission resources may be released only when the periodic downlink transmission resource or the periodic uplink transmission resource is configured or is configured and in use.

[0262] ■ Clear all HARQ buffers set for the above cell or partial bandwidth.

[0263] ■ If there are PUSCH transmission resources configured for semi-persistent CSI reporting for the above cell or partial bandwidth, clear them.

[0264] ■ The terminal does not transmit SRS for the above cell or partial bandwidth.

[0265] ■ For the above cell or partial bandwidth, the terminal does not perform or report channel measurements (such as CSI, CQI, PMI, RI, PTI, or CRI) for the downlink.

[0266] ■ Uplink data is not transmitted via UL-SCH in the above cell or partial bandwidth.

[0267] ■ Random access procedures are not performed for the above cells or partial bandwidths.

[0268] ■ In the above cell or partial bandwidth, the terminal does not monitor the PDCCH.

[0269] ■ The terminal does not monitor the PDCCH for the cell or partial bandwidth. Also, in the case of cross-scheduling, the PDCCH for the cell is not monitored in the scheduled cell.

[0270] ■ PUCCH or SPUCCH transmission is not performed in the above cell or partial bandwidth.

[0272] The present invention is characterized by operating an active state, an inactive state, or a sleep state, and performing transitions or switching on a partial bandwidth unit when a cell or partial bandwidth performs such transitions or switching. When a state transition or switching occurs on a partial bandwidth unit, the partial bandwidth to which the state transition or switching is instructed (downlink partial bandwidth or uplink partial bandwidth) performs the state transition or switching according to the state transition or switching instruction. For example, if a partial bandwidth (downlink or uplink partial bandwidth) transitions from an active state to a sleep state or switches to a sleep partial bandwidth, the partial bandwidth can be transitioned to a sleep state or switched to a sleep partial bandwidth.

[0273] In the present invention, partial bandwidth switching (BWP switching) means that when partial bandwidth switching is instructed by the DCI of the PDCCH, if switching is instructed by a partial bandwidth identifier while assigning a downlink assignment, the downlink partial bandwidth is switched to the partial bandwidth indicated by the partial bandwidth identifier; and when partial bandwidth switching is instructed by the DCI of the PDCCH, if switching is instructed by a partial bandwidth identifier while assigning a UL grant, the uplink partial bandwidth is switched to the partial bandwidth indicated by the partial bandwidth identifier. Furthermore, since the DCI format of the PDCCH itself is different for the format for downlink assignment (format1) and the format for UL grant (format0), the terminal operation can be performed by following the DCI format without explaining the uplink and downlink separately.

[0275] The method of operating state transitions at the bandwidth part level proposed above in the present invention, and the operation of the bandwidth according to each state, can be extended and applied to various embodiments. In the following sections of the present invention, specific embodiments that extend and apply the content proposed in the present invention are described.

[0277] A first embodiment of the present invention that operates state transitions and corresponding operations in partial bandwidth units is as follows.

[0278] In the first embodiment of the present invention, as shown in FIG. 1f, when setting multiple partial bandwidths per cell to a terminal via an RRC message, the dormant partial bandwidth is set using an indicator or partial bandwidth identifier. Additionally, the base station instructs the active cell to switch the partial bandwidth to the dormant partial bandwidth using the DCI of the PDCCH, which is L1 signaling. In the dormant partial bandwidth, monitoring of the PDCCH is not performed, and data transmission and reception are not performed, but channel measurement reporting is performed, thereby reducing terminal battery consumption and enabling rapid partial bandwidth activation. In the above, the base station may instruct the partial bandwidth switching by transmitting the DCI of the PDCCH, which is L1 signaling, from the cell (self-scheduling) or from a PCell or another SCell (cross-carrier scheduling). And when the base station requires data transmission and reception for an active cell that has been switched to the sleep portion bandwidth, it may use the DCI of the PDCCH, which is an L1 signaling, to instruct the active cell to switch from the sleep portion bandwidth to a portion bandwidth other than the sleep portion bandwidth (or active portion bandwidth) among the multiple portion bandwidths set by the RRC message, and then monitor the PDCCH again in the switched portion bandwidth and start data transmission and reception. In the above, when the base station instructs the switching of the cell's sleep portion bandwidth to the general portion bandwidth, since the terminal does not perform PDCCH monitoring in the sleep portion bandwidth, it may use cross-scheduling to instruct the PDCCH DCI, which is an L1 signaling, by transmitting it from the PCell or another SCell (cross-carrier scheduling).This is because when the partial bandwidth of the activated cell is switched to a dormant partial bandwidth, the PDCCH is not monitored for the cell, so cross-carrier scheduling can be applied in the PCell or another SCell to instruct the partial bandwidth switching for the cell. In the first embodiment of the present invention, the partial bandwidth may be operated or not used in a cell that is in an inactive state. Furthermore, in the first embodiment of the present invention, switching the partial bandwidth to a dormant partial bandwidth may be characterized as instructing switching for the downlink partial bandwidth. This is because the operation of not monitoring the PDCCH and the operation of performing channel measurement reporting are operations for the downlink partial bandwidth of the cell of the terminal. Additionally, in the first embodiment, when a MAC CE instructing to activate or deactivate a cell is received by the terminal, if the MAC CE instructs to activate the activated cell that has been switched to a dormant partial bandwidth, the terminal may be characterized as not complying with or ignoring the MAC CE instruction. Additionally, if the MAC CE instructs to deactivate an active cell that has been switched to a dormant partial bandwidth, the cell may be deactivated in accordance with the instruction of the MAC CE, and the downlink or uplink partial bandwidth set in the cell may be deactivated. Alternatively, if the MAC CE instructs to activate an active cell that has been switched to a dormant partial bandwidth, the terminal may switch and activate the downlink partial bandwidth or the uplink partial bandwidth to the downlink initial activation partial bandwidth or the uplink initial activation partial bandwidth, respectively, to perform data transmission and reception.

[0280] In the first embodiment of the present invention, the scheduling setting information for each cell can be set as follows, as shown in FIG. 1f of the present invention.

[0281] That is, the RRCSetup message or RRCResume message (1f-25) or RRCReconfiguration message (1f-45) of the RRC connection setup above may include scheduling information for each cell.

[0282] The scheduling information for each cell mentioned above may include some of the following information.

[0283] - Cross-carrier scheduling settings information

[0284] ■ Scheduling Cell Information

[0285] ◆ Own indicator (indicating that it is not cross-carrier scheduling, i.e., self-scheduling) and CIF (Carrier Indicator Field) indicator (cif-Presence, indicating whether the CIF field exists in the DCI format of the PDCCH)

[0286] ◆ Other indicator (indicating that it is cross-carrier scheduling), a cell identifier (schedulingCellId, ServCellIndex) indicating which cell will receive the cross-carrier scheduling, and a CIF identifier (cif-InSchedulingCell) to distinguish the cell being scheduled or the cell targeted for scheduling from the cell receiving the scheduling.

[0287] ◆ Sleep Part Bandwidth Identifier or Sleep Part Bandwidth Setting Indicator (an indicator or setting information indicating that sleep part bandwidth is set in the current cell, and that when sleep part bandwidth is used or when switching to sleep part bandwidth (BWP switching), scheduling or part bandwidth switching instructions will be received from other cells via cross-carrier scheduling)

[0289] Based on the scheduling setting information for each cell as described above, the terminal can instruct each cell to switch the general partial bandwidth (e.g., bandwidth that is not the sleep bandwidth) and the sleep partial bandwidth using the DCI (Downlink Control Information) of a PDCCH based on self-scheduling or cross-carrier scheduling.

[0290] According to the scheduling setting information for each cell above, a partial bandwidth switching procedure between a first partial bandwidth (e.g., a sleep partial bandwidth) and a second partial bandwidth (e.g., a partial bandwidth that is not a sleep partial bandwidth or a general partial bandwidth) is proposed in the first embodiment of the present invention.

[0291] FIGS. 1h and FIGS. 1i are drawings illustrating partial bandwidth switching in the first embodiment of the present invention.

[0292] FIG. 1h is a diagram illustrating the procedure for switching from a second partial bandwidth to a first partial bandwidth.

[0293] In FIG. 1h, the terminal may have multiple partial bandwidths set for the uplink or downlink for each of the multiple cells (1h-10, 1h-20) as in FIG. 1f, and one or more dormant partial bandwidths among the multiple partial bandwidths may be separately indicated. In FIG. 1h, only downlink partial bandwidths are shown for convenience of explanation. In FIG. 1h, some SCell (1h-20) is currently maintained or operated in an active state and can transmit and receive data in the activated second bandwidth. Also, depending on the scheduling setting information for each cell, PDCCH monitoring may be performed by self-scheduling in the SCell (1h-20) (1h-25), or PDCCH monitoring (1h-15) may be performed by cross-carrier scheduling in the PCell (1h-10). If the PCell (1h-10) or SCell (1h-20) receives the DCI (Downlink Control Information) of the PDCCH (1h-15, 1h-25) and is instructed to switch the current partial bandwidth to the first partial bandwidth (1h-22, 1h-30) via a bitmap, the terminal disables the current second partial bandwidth (1h-21) and switches to the first partial bandwidth (1h-30), and since the partial bandwidth is set as the sleep partial bandwidth, the terminal can perform operations when in a sleep state. That is, PDCCH monitoring is no longer performed for the SCell (1h-20), but channel measurement is performed and a procedure to report is performed for the first partial bandwidth (1h-30) of the SCell (1h-20), and data transmission and reception are not performed.

[0295] FIG. 1i is a diagram illustrating a procedure for switching from a first partial bandwidth to a second partial bandwidth or a first partial bandwidth.

[0296] In FIG. 1i, the terminal may have multiple partial bandwidths set for the uplink or downlink for each of the multiple cells (1i-10, 1i-20) as in FIG. 1f, and one or more dormant partial bandwidths among the multiple partial bandwidths may be separately indicated. In FIG. 1i, only downlink partial bandwidths are shown for convenience of explanation. In FIG. 1i, a SCell (1i-20) is currently maintained or operated in a dormant state with a first partial bandwidth, and PDCCH monitoring is no longer performed for the SCell (1i-20), but channel measurement is performed and reporting is performed for the first partial bandwidth (1i-30) of the SCell (1i-20), and data transmission and reception are not performed.

[0297] Since the SCell (1i-20) above does not perform PDCCH monitoring, it cannot read base station instructions. Therefore, the first embodiment of the present invention is characterized by applying a cross-scheduling method to read base station instructions for the first partial bandwidth. That is, if a SCell is set as the first partial bandwidth, the terminal can perform PDCCH monitoring (1i-15) on the PCell (1i-10) or another SCell by cross-carrier scheduling according to the scheduling setting information. If the PCell (1i-10) receives the DCI (Downlink Control Information) of the PDCCH (1i-15) and is instructed via a bitmap to switch the current partial bandwidth to the second partial bandwidth (1i-35), the terminal disables the current first partial bandwidth (1i-20) and switches to the first partial bandwidth (1h-30). Since it is a partial bandwidth that is not a dormant partial bandwidth, the terminal can perform operations when activated. That is, according to the scheduling setting information, PDCCH monitoring is performed on the PCell (1i-10) or SCell (1i-20), and a procedure is performed to perform channel measurement and report on the second partial bandwidth (1i-35) of the SCell (1i-20), and data transmission and reception can be performed. The partial bandwidth switching method based on cross-carrier scheduling proposed above can also be extended and used when instructing a switch from the first partial bandwidth to the first partial bandwidth.

[0298] The partial bandwidth switching procedure indicated by the DCI of the PDCCH in FIG. 1i and FIG. 1h above may indicate uplink partial bandwidth switching or downlink partial bandwidth switching depending on the DCI format. For example, DCI format 0 of the PDCCH indicates uplink partial bandwidth and can simultaneously allocate uplink grants, and DCI format 1 of the PDCCH indicates downlink partial bandwidth and can simultaneously allocate downlink assignments.

[0300] FIG. 1j is a diagram illustrating a first method for performing partial bandwidth switching in a first embodiment of the present invention. The first method illustrates a specific operation of a switching procedure from a second partial bandwidth to a second partial bandwidth in a serving cell (PCell or SCell), and may also illustrate a specific operation of a switching procedure from a first partial bandwidth to a second partial bandwidth in a serving cell (SCell).

[0301] In FIG. 1j, PCell and SCell can be configured with multiple partial bandwidths, and for the downlink or uplink of each cell, one partial bandwidth can be maintained in an active or dormant state or operated. For convenience of explanation, the downlink partial bandwidth is described in FIG. 1j.

[0302] In FIG. 1j above, SCell can receive a switching instruction for the current partial bandwidth of the SCell from the SCell's PDCCH via self-scheduling (1j-25) or from the PCell's PDCCH via cross-carrier scheduling (1j-15) according to scheduling setting information set as an RRC message as in FIG. 1f. The switching instruction for the partial bandwidth is performed by the DCI of the PDCCH above, and for the uplink partial bandwidth switching instruction, it must always be accompanied by and allocated an uplink transmission resource (transmission resource for the current or next partial bandwidth after the terminal switches the partial bandwidth), and for the downlink partial bandwidth switching instruction, it can be characterized by always accompanying and allocating a downlink transmission resource (transmission resource for the current or next partial bandwidth after the terminal switches the partial bandwidth, 1j-35). This is because the base station instructs the terminal to switch the partial bandwidth and has no way to verify whether the terminal has successfully received the partial bandwidth switching instruction.

[0303] Specifically, in the case of the uplink, when the terminal transmits data to the uplink transmission resource (transmission resource for the current or next partial bandwidth after the terminal switches the partial bandwidth) accompanied by the partial bandwidth indication above, the base station can confirm that the terminal has successfully performed uplink partial bandwidth switching because the terminal transmitted uplink data to the uplink transmission resource for the partial bandwidth indicated by the DCI of the PDCCH.

[0304] In addition, in the case of the downlink, when the terminal receives data using the downlink transmission resource (transmission resource for the current or next partial bandwidth after the terminal has switched the partial bandwidth) accompanied by the partial bandwidth indication mentioned above, and transmits a HARQ ACK (indicating successful downlink data reception) or NACK (indicating failure to successfully receive downlink data) to the base station, the base station can confirm that the terminal has successfully performed downlink partial bandwidth switching by receiving the HARQ ACK or NACK for the downlink transmission data for the partial bandwidth indicated by the DCI of the PDCCH. It should be noted that when receiving the HARQ ACK or HARQ NACK, the HARQ ACK or NACK itself may serve as an indication to the base station that the terminal has successfully performed downlink partial bandwidth. It should be noted that the HARQ ACK or NACK information indicates whether the downlink data was successfully received, and that the HARQ NACK information does not indicate a failure of downlink partial bandwidth switching. The above HARQ ACK or NACK information can be transmitted by the terminal using a transmission resource corresponding to the downlink data from a PUCCH transmission resource that is instructed to the terminal as a PDCCH or is pre-configured.

[0306] FIG. 1k is a diagram illustrating a second method for performing partial bandwidth switching in a first embodiment of the present invention. The second method may show a specific operation of a switching procedure from a second partial bandwidth to a first partial bandwidth in a serving cell (PCell or SCell).

[0307] In FIG. 1k, PCell and SCell can be configured with multiple partial bandwidths, and for the downlink or uplink of each cell, one partial bandwidth can be maintained in an active or dormant state or operated. For convenience of explanation, the downlink partial bandwidth in FIG. 1k is described.

[0308] In the above Fig. 1k, SCell can receive a switching instruction for the current partial bandwidth of the SCell from the PDCCH of the SCell via self-scheduling (1j-25) or from the PDCCH of the PCell via cross-carrier scheduling (1j-15) according to the scheduling setting information set as an RRC message as in Fig. 1f.

[0309] The method 2-1 of the present invention of FIG. 1k, which performs switching from a second partial bandwidth to a first partial bandwidth, is as follows.

[0310] In the method of 2-1 above, the partial bandwidth switching instruction is performed by the DCI of the PDCCH, and the downlink partial bandwidth switching instruction may always be characterized by being accompanied by and allocated a downlink transmission resource (transmission resource for the current or next partial bandwidth after the terminal has switched the partial bandwidth, 1k-35). This is because the base station instructs the terminal to switch the partial bandwidth and has no way to verify whether the terminal has successfully received the partial bandwidth switching instruction.

[0311] Specifically, in the case of a downlink, when the terminal receives data using the downlink transmission resource (transmission resource for the current or next partial bandwidth after the terminal has switched the partial bandwidth) accompanied by the partial bandwidth indication mentioned above, and transmits a HARQ ACK (indicating successful downlink data reception) or NACK (indicating failure to successfully receive downlink data) to the base station, the base station can confirm that the terminal has successfully performed downlink partial bandwidth switching by receiving the HARQ ACK or NACK for the downlink transmission data for the partial bandwidth indicated by the DCI of the PDCCH. It should be noted that when receiving the HARQ ACK or HARQ NACK, the HARQ ACK or NACK itself may serve as an indication to the base station that the terminal has successfully performed downlink partial bandwidth. It should be noted that the HARQ ACK or NACK information indicates whether the downlink data was successfully received, and that the HARQ NACK information does not indicate a failure of downlink partial bandwidth switching. The above HARQ ACK or NACK information may be transmitted by the terminal using a transmission resource corresponding to the downlink data from a pre-configured PUCCH transmission resource or a PDCCH transmission resource instructed to the terminal. More specifically, the terminal may send a HARQ ACK or NACK information instruction for the downlink data to a lower layer (e.g., a PHY layer device) to indicate whether the data was successfully received or whether the downlink data was successfully switched, when the terminal successfully receives a partial bandwidth switching instruction for the serving cell (PCell or SCell) and receives the downlink data.

[0313] The second-2 method of performing switching from the second partial bandwidth to the first partial bandwidth in the present invention of FIG. 1k is as follows.

[0314] In the method of 2-2 above, the partial bandwidth switching instruction is performed by the DCI of the PDCCH, and the downlink partial bandwidth switching instruction may be characterized by always entailing and allocating downlink transmission resources (transmission resources for the current or next partial bandwidth after the terminal switches the partial bandwidth, 1k-35). Additionally, the downlink data may be characterized by the base station transmitting it including padding. In the above, padding is data containing meaningless garbage values. When the terminal receives the data, it processes the data and discards it because it is padding, but there is an advantage in that it can transmit a HARQ ACK or NACK regarding the padding data to the base station. This is because if downlink data transmission is not involved, the base station instructs the terminal to switch the partial bandwidth, and there is no way to verify whether the terminal has successfully received the partial bandwidth switching instruction. For example, if the terminal instructs a HARQ ACK or NACK, it indicates a successful partial bandwidth switching; if neither the HARQ ACK nor the NACK is transmitted, it indicates that the partial bandwidth switching has failed.

[0315] Specifically, in the case of a downlink, when the terminal receives data using the downlink transmission resource (transmission resource for the current or next partial bandwidth after the terminal has switched the partial bandwidth) accompanied by the partial bandwidth indication mentioned above, and transmits a HARQ ACK (indicating successful downlink data reception) or NACK (indicating failure to successfully receive downlink data) to the base station, the base station can confirm that the terminal has successfully performed downlink partial bandwidth switching by receiving the HARQ ACK or NACK for the downlink transmission data for the partial bandwidth indicated by the DCI of the PDCCH. It should be noted that when receiving the HARQ ACK or HARQ NACK, the HARQ ACK or NACK itself may serve as an indication to the base station that the terminal has successfully performed downlink partial bandwidth. It should be noted that the HARQ ACK or NACK information indicates whether the downlink data was successfully received, and that the HARQ NACK information does not indicate a failure of downlink partial bandwidth switching. The above HARQ ACK or NACK information may be transmitted by the terminal using a transmission resource corresponding to the downlink data from a pre-configured PUCCH transmission resource or a PDCCH transmission resource instructed to the terminal. More specifically, the terminal may send a HARQ ACK or NACK information instruction for the downlink data to a lower layer (e.g., a PHY layer device) to indicate whether the data was successfully received or whether the downlink data was successfully switched, when the terminal successfully receives a partial bandwidth switching instruction for the serving cell (PCell or SCell) and receives the downlink data.

[0317] The second and third methods of performing switching from the second partial bandwidth to the first partial bandwidth in the present invention of FIG. 1k are as follows.

[0318] In the method of the second and third paragraphs above, the partial bandwidth switching instruction is performed by the DCI of the PDCCH, and the downlink partial bandwidth switching instruction may be characterized by always being accompanied by and allocated a downlink transmission resource (transmission resource for the current or next partial bandwidth after the terminal switches the partial bandwidth, 1k-35). However, since data is not transmitted or received in the dormant partial bandwidth (first partial bandwidth) where switching is instructed above, the terminal may not receive data regarding the downlink transmission resource. Since the base station knows that the terminal will not receive data from the downlink transmission resource instructed by the DCI of the PDCCH containing the partial bandwidth switching instruction above, the downlink data may be characterized by the base station transmitting it including padding. In the above, the terminal may not receive and process the downlink data, but may be characterized by the terminal transmitting a HARQ ACK or NACK corresponding to the downlink data to the base station to indicate whether the partial bandwidth switching was successful. For example, if the terminal instructs a successful partial bandwidth switching by sending a HARQ ACK or NACK, it may indicate that the partial bandwidth switching failed if neither the HARQ ACK nor the NACK is transmitted. This is because, unless downlink data transmission is involved, the base station instructs the terminal to perform partial bandwidth switching, and there is no way to verify whether the terminal has successfully received the partial bandwidth switching instruction.

[0319] Specifically, in the case of a downlink, if the terminal does not receive data using the downlink transmission resource (transmission resource for the current or next partial bandwidth after the terminal has switched the partial bandwidth) accompanied by the partial bandwidth indication above, but transmits a HARQ ACK (indicating successful downlink data reception) or NACK (indicating failure to successfully receive downlink data) to the base station, the base station can confirm that the terminal has successfully performed downlink partial bandwidth switching by receiving the HARQ ACK or NACK for the downlink transmission data for the partial bandwidth indicated by the DCI of the PDCCH. It should be noted that when receiving a HARQ ACK or a HARQ NACK, the HARQ ACK or NACK itself may serve as an indication to the base station that the terminal has successfully performed downlink partial bandwidth. It should be noted that the HARQ ACK or NACK information indicates whether the downlink data was successfully received, and that the HARQ NACK information does not indicate a failure of downlink partial bandwidth switching. The above HARQ ACK or NACK information may be transmitted by the terminal using a transmission resource corresponding to the downlink data from a pre-configured PUCCH transmission resource or PDCCH instructed to the terminal. More specifically, the terminal may successfully receive a partial bandwidth switching instruction for the serving cell (PCell or SCell), and even if it does not receive the downlink data, the MAC layer device may send a HARQ ACK or NACK information instruction for the downlink data to a lower layer (e.g., a PHY layer device) to instruct successful partial bandwidth switching.

[0321] The second-fourth method of performing switching from the second partial bandwidth to the first partial bandwidth in the present invention of FIG. 1k is as follows.

[0322] In the above method 2-4, the partial bandwidth switching instruction is performed by the DCI of the PDCCH, and the downlink partial bandwidth switching instruction may be characterized by always entailing and allocating downlink transmission resources (transmission resources for the current or next partial bandwidth after the terminal switches the partial bandwidth, 1k-35). However, since data is not transmitted or received in the dormant partial bandwidth (first partial bandwidth) where switching is instructed above, the terminal may not receive data regarding the downlink transmission resources. Since the base station knows that the terminal will not receive the downlink data instructed by the DCI of the PDCCH including the partial bandwidth switching instruction above, the base station may not transmit data regarding the downlink transmission resources in order to prevent waste of transmission resources. The above may be characterized in that the terminal does not receive and process data from the downlink transmission resource, and the base station does not transmit data from the downlink transmission resource, but the terminal transmits a HARQ ACK or NACK corresponding to the downlink transmission resource or data to the base station to indicate whether the partial bandwidth switching was successful. For example, if the terminal indicates a successful partial bandwidth switching by transmitting a HARQ ACK or NACK, it may indicate that the partial bandwidth switching failed if neither the HARQ ACK nor the NACK is transmitted. This is because, without downlink data transmission, the base station instructs the terminal to perform partial bandwidth switching, and there is no way to verify whether the terminal has successfully received the partial bandwidth switching instruction.

[0323] Specifically, in the case of the downlink, the terminal does not receive data through the downlink transmission resource (transmission resource for the current or next partial bandwidth after the terminal has switched the partial bandwidth) accompanied by the partial bandwidth indication above, nor does the base station transmit data through the said downlink transmission resource. However, when the terminal transmits a HARQ ACK (indicating successful downlink data reception) or NACK (indicating failure to successfully receive downlink data) to the base station, the base station can confirm that the terminal has successfully performed downlink partial bandwidth switching by receiving the HARQ ACK or NACK regarding the downlink transmission resource or data for the partial bandwidth indicated by the DCI of the said PDCCH. It should be noted above that when receiving a HARQ ACK or a HARQ NACK, the HARQ ACK or NACK itself may serve as an indication to the base station that the terminal has successfully performed downlink partial bandwidth switching. It should be noted that the HARQ ACK or NACK information above indicates whether the downlink data has been successfully received, and that the HARQ NACK information does not indicate a failure of downlink partial bandwidth switching. The HARQ ACK or NACK information may be transmitted by the terminal using the transmission resource corresponding to the downlink data from the transmission resource instructed to the terminal by PDCCH or a preset PUCCH transmission resource. More specifically, the terminal above successfully receives the partial bandwidth switching instruction for the serving cell (PCell or SCell). And even if the terminal does not receive the downlink data, the MAC layer device may send the HARQ ACK or NACK information instruction for the downlink data to a lower layer (e.g., a PHY layer device) to indicate successful partial bandwidth switching.

[0325] Alternatively, in the above method 2-1, method 2-2, method 2-3, or method 2-4, the HARQ ACK may indicate a successful partial bandwidth switching and the HARQ NACK may indicate that the partial bandwidth switching failed.

[0327] The second-fifth method of performing switching from the second partial bandwidth to the first partial bandwidth in the present invention of FIG. 1k is as follows.

[0328] In the above fifth method, the partial bandwidth switching instruction is performed using the DCI of the PDCCH, and when the base station performs the downlink partial bandwidth switching instruction, if it instructs switching to the second partial bandwidth, it uses a DCI format that always includes downlink transmission resources (transmission resources for the current or next partial bandwidth after the terminal switches the partial bandwidth, 1k-35) and allocates downlink transmission resources; and if it instructs switching to the first partial bandwidth, it uses a new DCI format that does not include downlink transmission resources (transmission resources for the current or next partial bandwidth after the terminal switches the partial bandwidth, 1k-35) and does not allocate downlink transmission resources. Since data is not transmitted or received in the dormant partial bandwidth (first partial bandwidth) where switching is instructed above, it can be characterized that the terminal does not receive data regarding the downlink transmission resources.

[0329] In addition, in the fifth method above, since partial bandwidth switching is instructed at the DCI of the PDCCH but is not accompanied by downlink transmission resources or data, the base station cannot know whether the terminal has successfully performed partial bandwidth switching. Therefore, the base station may be characterized by separately setting the transmission resources or period for reporting channel measurements (different from other partial bandwidths) by utilizing the characteristic that the terminal does not perform PDCCH monitoring in the first partial bandwidth but must periodically perform and report channel measurements. That is, when the base station instructs the terminal to switch to the first partial bandwidth using the fifth method above, it can confirm that the partial bandwidth switching is successful if the channel measurement report for the first partial bandwidth is reported in accordance with the transmission resources or period set for the first partial bandwidth. If the channel measurement report is not performed in accordance with the transmission resources or period set for the first partial bandwidth, the base station may determine that the partial bandwidth switching instruction has failed.

[0330] In addition, the fifth method described above may be used as a method to instruct switching to the first partial bandwidth or to maintain the first partial bandwidth, even though it does not instruct the uplink transmission resource or downlink transmission resource in the DCI of the PDCCH, and may be characterized by instructing the Cell Deactivation Timer to restart. That is, it may be used as a method to instruct the Cell Deactivation Timer to restart so that the cell remains in an active state and the partial bandwidth is maintained as the first partial bandwidth.

[0332] The above first method, second method, third method, fourth method, or fifth method may also be applied when instructing switching from the first partial bandwidth to the first partial bandwidth.

[0333] In addition, the first method, the second method, the third method, the fourth method, or the fifth method may be used as a method for instructing switching to the first partial bandwidth or as a method for maintaining the first partial bandwidth as it is. Alternatively, the method may be characterized by restarting the Cell Deactivation Timer of the serving cell when switching to the first partial bandwidth is instructed by applying the method, or when the terminal switches to the first partial bandwidth. That is, the method may be used as a method to restart the Cell Deactivation Timer so that the cell remains in an active state and the partial bandwidth is maintained as the first partial bandwidth.

[0334] Alternatively, the first method, the second method, the third method, the fourth method, or the fifth method may be used as a method for instructing a switching to the first partial bandwidth or as a method for maintaining the first partial bandwidth. It may also be characterized by stopping the Cell Deactivation Timer of the serving cell when the switching to the first partial bandwidth is instructed by applying the above method, or when the terminal switches to the first partial bandwidth. That is, the above method may be used as a method to stop the Cell Deactivation Timer so that the cell remains in an active state and the partial bandwidth is maintained as the first partial bandwidth.

[0336] The specific operation for downlink portion bandwidth switching of a base station in the first embodiment of the present invention is as follows.

[0337] As described above, the base station performs partial bandwidth switching instructions via the DCI of the PDCCH, and when the base station performs downlink partial bandwidth switching instructions,

[0338] - If switching to a second partial bandwidth is indicated, always use a DCI format that entails downlink transmission resources (transmission resources for the current or next partial bandwidth after the terminal has switched the partial bandwidth, 1k-35), allocate downlink transmission resources, and indicate switching to the second partial bandwidth (for example, each partial bandwidth identifier can be indicated by a bitmap).

[0339] - If switching is to be directed to a first partial bandwidth, switching to the first partial bandwidth may be directed using the first method, the second method, the third method, the fourth method, or the fifth method proposed in the present invention. (For example, each partial bandwidth identifier may be indicated using a bitmap).

[0340] -

[0341] The specific operation for downlink portion bandwidth switching of the terminal in the first embodiment of the present invention is as follows.

[0342] As described above, the terminal receives a partial bandwidth switching instruction as the DCI of the PDCCH, and when it receives a downlink partial bandwidth switching instruction from the base station,

[0343] - If switching to a second partial bandwidth is indicated, a DCI format is read that includes a downlink transmission resource (transmission resource for the current or next partial bandwidth after the terminal has switched the partial bandwidth, 1k-35), switching to the second partial bandwidth indicated above is performed, data is received from the downlink transmission resource indicated above, and HARQ ACK or NACK information for the downlink data is transmitted to the indicated PUCCH transmission resource.

[0344] - If switching is instructed to the first partial bandwidth, the procedure is performed according to the first method, the second method, the third method, the fourth method, or the fifth method proposed in the present invention, switching is performed to the first partial bandwidth, and operations according to each method can be performed.

[0346] New methods may be devised and expanded by combining or fusing the features of each of the above-mentioned first, second, third, fourth, or fifth methods.

[0348] In the following of the present invention, a 1-1 embodiment regarding a specific terminal operation for reading PDCCH according to the scheduling setting information for each cell in the first embodiment is proposed as follows.

[0349] - 1> If the scheduling configuration information of a serving cell includes self-scheduling configuration information (e.g., own identifier) ​​or cross-carrier scheduling configuration information (e.g., other identifier), and the cross-carrier scheduling configuration information (Cross carrier scheduling) includes a dormant partial bandwidth identifier or indicator (or if the scheduling configuration information includes a dormant partial bandwidth identifier or indicator), the following first operation is performed.

[0350] ■ 2> If the active partial bandwidth of the current serving cell (SCell) is the first partial bandwidth

[0351] ◆ 3> By applying the cross-carrier scheduling method, the cell designated as the scheduling cell (or the cell receiving the scheduling instruction, scheduling cell) in the above scheduling setting information receives the PDCCH, and the current serving cell (SCell) does not receive the PDCCH.

[0352] ◆ 3> If the received PDCCH above instructs partial bandwidth switching to the first partial bandwidth,

[0353] ● 4> Apply the above-mentioned first method, second method, third method, fourth method, or fifth method. For example, switch to the partial bandwidth indicated by the above DCI and ignore the data corresponding to the downlink transmission resource indicated by the above DCI without receiving it.

[0354] ◆ 3> If the received PDCCH above instructs partial bandwidth switching to the second partial bandwidth,

[0355] ● 4> Switch to the partial bandwidth indicated by the above DCI, receive data corresponding to the downlink transmission resource indicated by the above DCI, and transmit a corresponding HARQ ACK or NACK.

[0356] ■ 2> If the active partial bandwidth of the current serving cell (SCell) is the second partial bandwidth

[0357] ◆ 3> In the above scheduling setting information, the cell designated as the scheduling cell (or the cell receiving the scheduling instruction, scheduling cell) does not receive the PDCCH, and the current serving cell (SCell) receives the PDCCH.

[0358] ◆ 3> If the received PDCCH above instructs partial bandwidth switching to the first partial bandwidth,

[0359] ● 4> Apply the above-mentioned first method, second method, third method, fourth method, or fifth method. For example, switch to the partial bandwidth indicated by the above DCI and ignore the data corresponding to the downlink transmission resource indicated by the above DCI without receiving it.

[0360] ◆ 3> If the received PDCCH above instructs partial bandwidth switching to the second partial bandwidth,

[0361] ● 4> Switch to the partial bandwidth indicated by the above DCI, receive data corresponding to the downlink transmission resource indicated by the above DCI, and transmit a corresponding HARQ ACK or NACK.

[0362] - 1> If the scheduling configuration information of a serving cell includes self-scheduling configuration information (e.g., own identifier) ​​or cross-carrier scheduling configuration information (e.g., other identifier), and the cross-carrier scheduling configuration information does not include a dormant partial bandwidth identifier or indicator (or if the scheduling configuration information does not include a dormant partial bandwidth identifier or indicator), the following second action is performed.

[0363] ■ 2> Based on the above scheduling setting information, PDCCH is received and read from the active partial bandwidth of the current cell or the cell performing scheduling using a self-scheduling method or a cross-carrier scheduling method.

[0364] ■ 2> If the received PDCCH above instructs partial bandwidth switching to the second partial bandwidth,

[0365] ◆ 3> Switch to the partial bandwidth indicated by the above DCI, receive data corresponding to the downlink transmission resource indicated by the above DCI, and transmit a corresponding HARQ ACK or NACK.

[0367] In the following of the present invention, a first-second embodiment regarding a specific terminal operation for reading PDCCH according to the scheduling setting information for each cell in the first embodiment is proposed as follows.

[0368] - 1> If the scheduling configuration information of a serving cell includes self-scheduling configuration information (e.g., own identifier) ​​or cross-carrier scheduling configuration information (e.g., other identifier), and the cross-carrier scheduling configuration information includes a dormant partial bandwidth identifier or indicator (or if the scheduling configuration information includes a dormant partial bandwidth identifier or indicator), and if self-scheduling is configured in the current serving cell (if cross-carrier scheduling is not configured), the following first operation is performed.

[0369] ■ 2> If the active partial bandwidth of the current serving cell (SCell) is the first partial bandwidth

[0370] ◆ 3> By applying the cross-carrier scheduling method, the cell designated as the scheduling cell (or the cell receiving the scheduling instruction, scheduling cell) in the above scheduling setting information receives the PDCCH, and the current serving cell (SCell) does not receive the PDCCH.

[0371] ◆ 3> If the received PDCCH above instructs partial bandwidth switching to the first partial bandwidth,

[0372] ● 4> Apply the above-mentioned first method, second method, third method, fourth method, or fifth method. For example, switch to the partial bandwidth indicated by the above DCI and ignore the data corresponding to the downlink transmission resource indicated by the above DCI without receiving it.

[0373] ◆ 3> If the received PDCCH above instructs partial bandwidth switching to the second partial bandwidth,

[0374] ● 4> Switch to the partial bandwidth indicated by the above DCI, receive data corresponding to the downlink transmission resource indicated by the above DCI, and transmit a corresponding HARQ ACK or NACK.

[0375] ■ 2> If the active partial bandwidth of the current serving cell (SCell) is the second partial bandwidth

[0376] ◆ 3> In the above scheduling setting information, the cell designated as the scheduling cell (or the cell receiving the scheduling instruction) does not receive the PDCCH, and the self-scheduling method is applied to receive the PDCCH in the active partial bandwidth of the current serving cell (SCell).

[0377] ◆ 3> If the received PDCCH above instructs partial bandwidth switching to the first partial bandwidth,

[0378] ● 4> Apply the above-mentioned first method, second method, third method, fourth method, or fifth method. For example, switch to the partial bandwidth indicated by the above DCI and ignore the data corresponding to the downlink transmission resource indicated by the above DCI without receiving it.

[0379] ◆ 3> If the received PDCCH above instructs partial bandwidth switching to the second partial bandwidth,

[0380] ● 4> Switch to the partial bandwidth indicated by the above DCI, receive data corresponding to the downlink transmission resource indicated by the above DCI, and transmit a corresponding HARQ ACK or NACK.

[0381] - 1> If the scheduling configuration information of a serving cell includes self-scheduling configuration information (e.g., own identifier) ​​or cross-carrier scheduling configuration information (e.g., other identifier), and the cross-carrier scheduling configuration information does not include a dormant partial bandwidth identifier or indicator (or if the scheduling configuration information does not include a dormant partial bandwidth identifier or indicator), and if self-scheduling is configured in the current serving cell (if cross-carrier scheduling is not configured), the following second operation is performed.

[0382] ■ 2> Based on the above scheduling settings, receive and read PDCCH in the active partial bandwidth of the current cell using the self-scheduling method. Cross-carrier scheduling is not applied.

[0383] ■ 2> If the received PDCCH above instructs partial bandwidth switching to the second partial bandwidth,

[0384] ◆ 3> Switch to the partial bandwidth indicated by the above DCI, receive data corresponding to the downlink transmission resource indicated by the above DCI, and transmit a corresponding HARQ ACK or NACK.

[0385] - 1> If the scheduling configuration information of a serving cell includes self-scheduling configuration information (e.g., own identifier) ​​or cross-carrier scheduling configuration information (e.g., other identifier), and the cross-carrier scheduling configuration information includes a dormant partial bandwidth identifier or indicator (or if the scheduling configuration information includes a dormant partial bandwidth identifier or indicator), and cross-carrier scheduling is configured in the current serving cell (if self-scheduling is not configured), the following third action is performed.

[0386] ■ 2> By applying the cross-carrier scheduling method, the cell designated as the scheduling cell (or the cell receiving the scheduling instruction, scheduling cell) in the above scheduling setting information receives the PDCCH, and the current serving cell (SCell) does not receive the PDCCH.

[0387] ■ 2> If the received PDCCH above instructs partial bandwidth switching to the first partial bandwidth,

[0388] ◆ 3> Apply the above-mentioned first method, second method, third method, fourth method, or fifth method. For example, switch to the partial bandwidth indicated by the above-mentioned DCI and ignore the data corresponding to the downlink transmission resource indicated by the above-mentioned DCI without receiving it.

[0389] ■ 2> If the received PDCCH above instructs partial bandwidth switching to the second partial bandwidth,

[0390] ◆ 3> Switch to the partial bandwidth indicated by the above DCI, receive data corresponding to the downlink transmission resource indicated by the above DCI, and transmit a corresponding HARQ ACK or NACK.

[0391] - 1> If the scheduling configuration information of a serving cell includes self-scheduling configuration information (e.g., own identifier) ​​or cross-carrier scheduling configuration information (e.g., other identifier), and the cross-carrier scheduling configuration information does not include a dormant partial bandwidth identifier or indicator (or if the scheduling configuration information does not include a dormant partial bandwidth identifier or indicator), and if cross-carrier scheduling is configured in the current serving cell (if self-scheduling is not configured), the following 4th action is performed.

[0392] ■ 2> Based on the above scheduling setting information, PDCCH is received and read from the active partial bandwidth of the cell that performs the scheduling indicated in the above scheduling setting information using the cross-carrier scheduling method. Self-scheduling is not applied.

[0393] ■ 2> If the received PDCCH above instructs partial bandwidth switching to the second partial bandwidth,

[0394] ◆ 3> Switch to the partial bandwidth indicated by the above DCI, receive data corresponding to the downlink transmission resource indicated by the above DCI, and transmit a corresponding HARQ ACK or NACK.

[0396] The partial bandwidth switching procedure or the PDCCH reception method proposed in the present invention can be extended and applied in the same way to the uplink partial bandwidth switching procedure.

[0398] The first-3-1 embodiment regarding specific operations related to the partial bandwidth and partial bandwidth disable timer of the MAC layer device according to the first embodiment of the present invention is as follows, characterized in that the partial bandwidth disable timer is started or restarted only if the basic partial bandwidth is set and the partial bandwidth for which partial bandwidth switching is instructed is not the dormant partial bandwidth or the basic partial bandwidth, or if the basic partial bandwidth is not set and the partial bandwidth for which partial bandwidth switching is instructed is not the dormant partial bandwidth or the initial partial bandwidth.

[0399] If the MAC layer device receives a PDCCH instruction for partial bandwidth switching of a serving cell (PCell or PSCell or SCell), the MAC layer device operates as follows for a serving cell with a partial bandwidth disable timer set.

[0400] - 1> If a PDCCH for a partial bandwidth switching instruction is received, and the MAC layer device switches the downlink enable partial bandwidth according to the instruction,

[0401] ■ 2> If the downlink default partial bandwidth identifier (defaultDownlinkBWP-Id) is set, and the MAC layer device switches to a partial bandwidth not designated as the downlink default partial bandwidth identifier or downlink sleep partial bandwidth,

[0402] ■ 2> If the default Downlink BWP-Id is not set, and the MAC layer device switches to a bandwidth other than the downlink initial bandwidth or downlink sleep bandwidth,

[0403] ◆ 3> Start or restart the partial bandwidth disable timer (bwp-InactivityTimer) regarding the downlink enabled partial bandwidth mentioned above.

[0405] The 1-3-2 embodiment regarding specific operations related to the partial bandwidth and partial bandwidth disable timer of the MAC layer device according to the first embodiment of the present invention is as follows, characterized in that the partial bandwidth disable timer is started or restarted only when the partially bandwidth that is switched and activated is not a dormant partial bandwidth.

[0406] If the MAC layer device receives a PDCCH instruction for partial bandwidth switching of a serving cell (PCell or PSCell or SCell), the MAC layer device operates as follows for a serving cell with a partial bandwidth disable timer set.

[0407] - 1> If a PDCCH for a partial bandwidth switching instruction is received, and the MAC layer device switches the downlink enable partial bandwidth according to the instruction,

[0408] ■ 2> If the downlink default partial bandwidth identifier (defaultDownlinkBWP-Id) is set, and the MAC layer device switches to a partial bandwidth not indicated by the downlink default partial bandwidth identifier,

[0409] ■ 2> If the default Downlink BWP-Id is not set, and the MAC layer device switches to a partial bandwidth other than the initial downlink partial bandwidth,

[0410] ◆ 3> If the switched-in active downlink partial bandwidth is not the dormant partial bandwidth, or is not the partial bandwidth indicated by the dormant partial bandwidth identifier

[0411] ● 4> Start or restart the partial bandwidth disable timer (bwp-InactivityTimer) regarding the downlink enabled partial bandwidth mentioned above.

[0413] The first-3-3 embodiment regarding specific operations related to the uplink partial bandwidth when the downlink partial bandwidth of the MAC layer device according to the first embodiment of the present invention is switched to the sleep partial bandwidth is as follows, and is characterized by deactivating the active uplink partial bandwidth if the downlink partial bandwidth is switched to the sleep partial bandwidth. This is because the uplink partial bandwidth will not be used since the PDCCH is not monitored and data transmission and reception are not performed in the sleep partial bandwidth.

[0414] If the MAC layer device receives instructions from the PDCCH for partial bandwidth switching of the serving cell (PCell or PSCell or SCell)

[0415] - 1> If there is no random access procedure in progress in the above serving cell

[0416] - 1> Or if the random access procedure in progress in the above serving cell is successfully completed upon receiving the PDCCH indicated by the above C-RNTI

[0417] ■ 2> The terminal switches the current partial bandwidth of the serving cell to the partial bandwidth indicated in the PDCCH.

[0418] ■ 2> If the partial bandwidth indicated by the PDCCH is a downlink partial bandwidth having the same partial bandwidth identifier as the downlink dormant partial bandwidth identifier, or if the partial bandwidth activated by switching above is the downlink dormant partial bandwidth

[0419] ◆ 3> Disable the active uplink portion bandwidth of this serving cell.

[0420] ◆ 3> If the partial bandwidth activation timer for the active downlink partial bandwidth is currently running in this serving cell, stop the partial bandwidth activation timer. This is to prevent the dormant partial bandwidth from automatically switching to and becoming active as the default partial bandwidth (battery consumption due to PDCCH monitoring). If the default partial bandwidth is set to the dormant partial bandwidth, the above problem can also be prevented.

[0421] ◆ 3> As another method, if the cell deactivation timer is running, you can stop the cell deactivation timer. This is because it is an action that can be applied to prevent the dormant portion bandwidth from being automatically deactivated when the cell timer expires and the cell deactivates.

[0423] The 1-3-4 embodiment regarding specific operations related to the uplink partial bandwidth when the downlink partial bandwidth of the MAC layer device according to the first embodiment of the present invention is a sleep partial bandwidth but is switched to a general partial bandwidth that is not a sleep partial bandwidth is as follows, and if the downlink partial bandwidth is switched from a sleep partial bandwidth to a general partial bandwidth, the uplink partial bandwidth is switched to the initial active partial bandwidth and activated.

[0425] If the MAC layer device receives instructions from the PDCCH for partial bandwidth switching of the serving cell (PCell or PSCell or SCell)

[0426] - 1> If there is no random access procedure in progress in the above serving cell

[0427] - 1> Or if the random access procedure in progress in the above serving cell is successfully completed upon receiving the PDCCH indicated by the above C-RNTI

[0428] ■ 2> The terminal switches the current partial bandwidth of the serving cell to the partial bandwidth indicated in the PDCCH.

[0429] ■ 2> If the partial bandwidth indicated by the PDCCH is a downlink partial bandwidth having the same partial bandwidth identifier as the downlink dormant partial bandwidth identifier, or if the partial bandwidth activated by switching above is the downlink dormant partial bandwidth

[0430] ◆ 3> Disable the active uplink portion bandwidth of this serving cell.

[0431] ◆ 3> If the partial bandwidth activation timer for the active downlink partial bandwidth is currently running in this serving cell, stop the partial bandwidth activation timer. This is to prevent the dormant partial bandwidth from automatically switching to and becoming active as the default partial bandwidth (battery consumption due to PDCCH monitoring). If the default partial bandwidth is set to the dormant partial bandwidth, the above problem can also be prevented.

[0432] ◆ 3> As another method, if the cell deactivation timer is running, you can stop the cell deactivation timer. This is because it is an action that can be applied to prevent the dormant portion bandwidth from being automatically deactivated when the cell timer expires and the cell deactivates.

[0433] ■ 2> If the active downlink partial bandwidth (e.g., previous downlink partial bandwidth) was a dormant partial bandwidth or a partial bandwidth designated by a dormant partial bandwidth identifier,

[0434] ■ 2> And if the partial bandwidth indicated by PDCCH is a partial bandwidth with a partial bandwidth identifier that is not equal to the dormant partial bandwidth identifier, or if the downlink partial bandwidth switched and activated according to the PDCCH instruction is not a dormant partial bandwidth

[0435] ◆ 3> Currently, activate the uplink partial bandwidth of this serving cell to the uplink partial bandwidth indicated by the initial active partial bandwidth identifier or the initial active partial bandwidth.

[0437] The 1-3-5 embodiment regarding specific operations related to the uplink partial bandwidth when the downlink partial bandwidth of the MAC layer device according to the first embodiment of the present invention is a sleep partial bandwidth but is switched to a general partial bandwidth that is not a sleep partial bandwidth is as follows, and if the downlink partial bandwidth is switched from a sleep partial bandwidth to a general partial bandwidth, the uplink partial bandwidth is switched and activated to an uplink partial bandwidth having a partial bandwidth identifier identical to the partial bandwidth identifier indicated by the PDCCH.

[0439] If the MAC layer device receives instructions from the PDCCH for partial bandwidth switching of the serving cell (PCell or PSCell or SCell),

[0440] - 1> If there is no random access procedure in progress in the above serving cell

[0441] - 1> Or if the random access procedure in progress in the above serving cell is successfully completed upon receiving the PDCCH indicated by the above C-RNTI

[0442] ■ 2> The terminal switches the current partial bandwidth of the serving cell to the partial bandwidth indicated in the PDCCH.

[0443] ■ 2> If the partial bandwidth indicated by the PDCCH is a downlink partial bandwidth having the same partial bandwidth identifier as the downlink dormant partial bandwidth identifier, or if the partial bandwidth activated by switching above is the downlink dormant partial bandwidth

[0444] ◆ 3> Disable the active uplink portion bandwidth of this serving cell.

[0445] ◆ 3> If the partial bandwidth activation timer for the active downlink partial bandwidth is currently running in this serving cell, stop the partial bandwidth activation timer. This is to prevent the dormant partial bandwidth from automatically switching to and becoming active as the default partial bandwidth (battery consumption due to PDCCH monitoring). If the default partial bandwidth is set to the dormant partial bandwidth, the above problem can also be prevented.

[0446] ◆ 3> As another method, if the cell deactivation timer is running, you can stop the cell deactivation timer. This is because it is an action that can be applied to prevent the dormant portion bandwidth from being automatically deactivated when the cell timer expires and the cell deactivates.

[0447] ■ 2> If the active downlink partial bandwidth (e.g., previous downlink partial bandwidth) was a dormant partial bandwidth or a partial bandwidth designated by a dormant partial bandwidth identifier,

[0448] ■ 2> And if the partial bandwidth indicated by PDCCH is a partial bandwidth with a partial bandwidth identifier that is not equal to the dormant partial bandwidth identifier, or if the downlink partial bandwidth switched and activated according to the PDCCH instruction is not a dormant partial bandwidth

[0449] ◆ 3> Activate the uplink partial bandwidth of this serving cell to have the same partial bandwidth identifier as the partial bandwidth identifier specified in the above PDCCH, or to have the same partial bandwidth identifier as the partial bandwidth identifier of the current downlink partial bandwidth.

[0451] The 1-3-6 embodiment regarding specific operations related to the uplink partial bandwidth when the downlink partial bandwidth of the MAC layer device according to the first embodiment of the present invention is a sleep partial bandwidth but is switched to a general partial bandwidth that is not a sleep partial bandwidth is as follows, and if the downlink partial bandwidth is switched from a sleep partial bandwidth to a general partial bandwidth, the uplink partial bandwidth is switched and activated to the uplink partial bandwidth that was activated when the downlink partial bandwidth was previously switched to a sleep partial bandwidth or the uplink partial bandwidth that was last activated.

[0453] If the MAC layer device receives instructions from the PDCCH for partial bandwidth switching of the serving cell (PCell or PSCell or SCell)

[0454] - 1> If there is no random access procedure in progress in the above serving cell

[0455] - 1> Or if the random access procedure in progress in the above serving cell is successfully completed upon receiving the PDCCH indicated by the above C-RNTI

[0456] ■ 2> The terminal switches the current partial bandwidth of the serving cell to the partial bandwidth indicated in the PDCCH.

[0457] ■ 2> If the partial bandwidth indicated by the PDCCH is a downlink partial bandwidth having the same partial bandwidth identifier as the downlink dormant partial bandwidth identifier, or if the partial bandwidth activated by switching above is the downlink dormant partial bandwidth

[0458] ◆ 3> Disable the active uplink portion bandwidth of this serving cell.

[0459] ◆ 3> If the partial bandwidth activation timer for the active downlink partial bandwidth is currently running in this serving cell, stop the partial bandwidth activation timer. This is to prevent the dormant partial bandwidth from automatically switching to and becoming active as the default partial bandwidth (battery consumption due to PDCCH monitoring). If the default partial bandwidth is set to the dormant partial bandwidth, the above problem can also be prevented.

[0460] ◆ 3> As another method, if the cell deactivation timer is running, you can stop the cell deactivation timer. This is because it is an action that can be applied to prevent the dormant portion bandwidth from being automatically deactivated when the cell timer expires and the cell deactivates.

[0461] ■ 2> If the active downlink partial bandwidth (e.g., previous downlink partial bandwidth) was a dormant partial bandwidth or a partial bandwidth designated by a dormant partial bandwidth identifier,

[0462] ■ 2> And if the partial bandwidth indicated by PDCCH is a partial bandwidth with a partial bandwidth identifier that is not equal to the dormant partial bandwidth identifier, or if the downlink partial bandwidth switched and activated according to the PDCCH instruction is not a dormant partial bandwidth

[0463] ◆ 3> Currently, the uplink portion bandwidth of this serving cell is activated to the uplink portion bandwidth that was active when the downlink portion bandwidth was previously switched to the dormant portion bandwidth, or to the uplink portion bandwidth that was last activated.

[0465] The 1-3-7 embodiment regarding specific operations according to the cell state (activated state or deactivated state) of the MAC layer device according to the 1st embodiment of the present invention is as follows.

[0466] - For a serving cell (PCell or SCell), if an instruction to disable the cell is received via a MAC CE or RRC message, or if a cell disable timer was set and the timer has expired, one or more of the following actions may be performed.

[0467] ■ Disables downlink or uplink partial bandwidth.

[0468] ■ Stop the cell disable timer that is set or running in the above cell or partial bandwidth.

[0469] ■ If the partial bandwidth disable timer configured for the partial bandwidth of the above cell is running, the said partial bandwidth disable timer is stopped. This is to prevent unnecessary partial bandwidth switching procedures in the above cell.

[0470] ■ Periodic downlink assignment resources (DL SPS or configured downlink assignment) or periodic uplink assignment resources (UL SPS or configured uplink grant Type 2) configured in the partial bandwidth of the cell above can be cleared. The meaning of "clearing" above is that while the terminal stores configuration information, such as period information set in the RRC message, the information regarding periodic assignment resources indicated or activated by L1 signaling (e.g., DCI) is removed and no longer used. The method proposed above, that is, the operation of clearing periodic downlink assignment resources (DL SPS or configured downlink assignment) or periodic uplink assignment resources (UL SPS or configured uplink grant), may be performed only when the partial bandwidth transitions from an active state to a dormant state. This is because when the partial bandwidth transitions from an inactive state to a dormant state, there is no information regarding periodic assignment resources indicated or activated by L1 signaling. Alternatively, the periodic transmission resources can be released only when the periodic downlink transmission resources or periodic uplink transmission resources are set or are set and in use.

[0471] ■ The periodic uplink transmission resource (configured uplink grant Type 1 configured via RRC) set in the partial bandwidth of the cell above can be suspended. The meaning of "suspending" above is that the terminal stores the transmission resource configuration information set in the RRC message but no longer uses it. The method proposed above, that is, the operation of suspending the configured periodic uplink transmission resource (configured uplink grant Type 1), may be performed only when the partial bandwidth transitions from an active state to a dormant state. This is because when the partial bandwidth transitions from an inactive state to a dormant state, the periodic transmission resource is not being used. Alternatively, the periodic transmission resources may be released only when the periodic downlink transmission resource or the periodic uplink transmission resource is configured or is configured and in use.

[0472] ■ Clear all HARQ buffers set in the above uplink or downlink partial bandwidth.

[0473] ■ The terminal does not transmit SRS for the uplink portion bandwidth of the above cell.

[0474] ■ Uplink data is not transmitted via UL-SCH in the partial bandwidth of the above cell.

[0475] ■ Random access procedures are not performed on the partial bandwidth of the above cell.

[0476] ■ In the partial bandwidth of the above cell, the terminal does not monitor the PDCCH.

[0477] ■ The terminal does not monitor the PDCCH for the partial bandwidth of the cell. However, if a dormant partial bandwidth is set for the cell, in the case of cross-scheduling, the scheduled cell (e.g., PCell) may monitor the PDCCH for the cell (e.g., SCell) and receive instructions.

[0478] ■ PUCCH or SPUCCH transmission is not performed within the partial bandwidth of the above cell.

[0480] - If a partial bandwidth (e.g., downlink partial bandwidth) of the current cell (PCell or SCell) or an instruction to activate said cell is received via the DCI (L1 control signal) or MAC CE or RRC message of the PDCCH, or if a instruction to switch the dormant partial bandwidth (e.g., downlink partial bandwidth) to the active partial bandwidth (or partial bandwidth other than the dormant partial bandwidth) is received via the DCI (L1 control signal) or MAC CE or RRC message of the PDCCH (in the case where the instruction is received via the L1 control signal of the PDCCH above, the instruction may be received from the PDCCH of its own cell via self-scheduling, or the instruction may be received from the PDCCH for said cell in the PCell via cross-carrier scheduling), one or more of the following operations may be performed.

[0481] ■ If the current downlink partial bandwidth of this serving cell is not a dormant partial bandwidth, or if this serving cell was previously in a deactivated state and is being activated by the instructions of the MAC CE above, switch the uplink or downlink partial bandwidth to a specified partial bandwidth (e.g., uplink or uplink initial activation partial bandwidth) and activate the said partial bandwidth.

[0482] ■ If the current downlink portion bandwidth of this serving cell is not a dormant portion bandwidth, or if this serving cell was previously in a deactivated state and is being activated by the instruction of the MAC CE, a Sounding Reference Signal (SRS) is transmitted so that the base station can perform channel measurements for the uplink in the activated portion bandwidth. For example, it may be transmitted periodically.

[0483] ■ If the current downlink partial bandwidth of this serving cell is not a dormant partial bandwidth, or if this serving cell was previously in a deactivated state and is being activated by the instruction of the MAC CE, and if PUCCH is set on the activated partial bandwidth, perform a PUCCH transmission.

[0484] ■ If the current downlink partial bandwidth of this serving cell is not a dormant partial bandwidth, or if this serving cell was previously in a deactivated state and is being activated by the instructions of the MAC CE above, the partial bandwidth or cell deactivation timer is started or restarted for the above. Alternatively, the partial bandwidth or cell deactivation timer may be started or restarted only if the partial bandwidth or cell deactivation timer is not set. If the partial bandwidth or cell deactivation timer can be set via an RRC message, the partial bandwidth or cell may be put into sleep upon the expiration of the timer. For example, the partial bandwidth or cell deactivation timer may be started or restarted only in a dormant partial bandwidth or cell.

[0485] ■ If the current downlink portion bandwidth of this serving cell is not the dormant portion bandwidth, or if this serving cell was previously in a deactivated state and is being activated by the instructions of the MAC CE above, and if there is a Type 1 configured transmission resource that has been deactivated, the stored Type 1 transmission resource can be initialized to its original configuration and used. In the above, the Type 1 configured transmission resource refers to a periodic transmission resource (uplink or downlink) pre-allocated via an RRC message and a transmission resource that can be activated and used via an RRC message.

[0486] ■ If the current downlink partial bandwidth of this serving cell is not a dormant partial bandwidth, or if this serving cell was previously inactive and is being activated by the instruction of the MAC CE above, trigger the PHR for the said partial bandwidth.

[0487] ■ In the above-mentioned activated partial bandwidth, the terminal may report channel measurement results (such as CSI, CQI, PMI, RI, PTI, or CRI) for the downlink according to the base station settings.

[0488] ■ If the current downlink partial bandwidth of this serving cell is not a dormant partial bandwidth, or if this serving cell was previously inactive and is being activated by the instruction of the MAC CE, the PDCCH is monitored to read the instruction of the base station in the activated partial bandwidth.

[0489] ■ If the current downlink partial bandwidth of this serving cell is not a dormant partial bandwidth, or if this serving cell was previously inactive and is being activated by the instruction of the MAC CE, monitor PDCCH to read the cross-scheduling for the activated partial bandwidth.

[0490] ■ If the current downlink partial bandwidth of this serving cell is not a dormant partial bandwidth, or if this serving cell was previously in a disabled state and is being enabled by the instruction of the MAC CE above, the partial bandwidth disable timer above is started or restarted. Alternatively, the partial bandwidth disable timer may be started or restarted only if the partial bandwidth dormancy timer is not set. If the partial bandwidth dormancy timer above can be set via an RRC message, the partial bandwidth may be switched to a dormant or dormant partial bandwidth upon the expiration of the timer. For example, the partial bandwidth disable timer may be started or restarted only in the dormant partial bandwidth.

[0491] ■ If the current downlink partial bandwidth of this serving cell is not a dormant partial bandwidth, or if this serving cell was previously in a deactivated state and is being activated by the instructions of the above MAC CE, and if a link partial bandwidth dormancy timer is set for the said partial bandwidth

[0492] ■ Start or restart the partial bandwidth sleep timer for the above partial bandwidth.

[0494] In addition, in the first embodiment of the present invention, if a base station triggers a random access procedure for a SCell, the base station may be characterized by not instructing the downlink partial bandwidth to switch to a sleep partial bandwidth for said SCell. This is because if the downlink sleep partial bandwidth is switched, the uplink partial bandwidth is deactivated, and thus the random access procedure cannot be successfully performed.

[0495] In addition, in the first embodiment of the present invention, the operation related to the switching of a general partial bandwidth (e.g., a partial bandwidth that is not a dormant partial bandwidth) or a dormant partial bandwidth is performed when the cell (e.g., SCell) in which the partial bandwidth is operated is in an active state. Therefore, if MAC control information (MAC Control Element, MAC CE) containing an indicator to activate or deactivate the cell is received, if the cell is operating a downlink dormant partial bandwidth, the indicator may be ignored. Furthermore, if the cell is operating a downlink dormant partial bandwidth and receives a MAC CE containing an indicator to deactivate the cell, the downlink dormant partial bandwidth of the cell may be deactivated. Alternatively, in the first embodiment of the present invention, when the downlink partial bandwidth is switched to a dormant partial bandwidth, if the cell deactivation timer is running, the cell deactivation timer may be stopped. This is because it is an operation that can be applied to prevent the dormant partial bandwidth from being deactivated due to the expiration of the cell timer and the automatic deactivation of the dormant partial bandwidth.

[0497] A second embodiment of the present invention that operates state transitions and corresponding operations in partial bandwidth units is as follows.

[0498] In the second embodiment of the present invention, as shown in FIG. 1f, when setting multiple partial bandwidths per cell to a terminal via an RRC message, the dormant partial bandwidth is set using an indicator or partial bandwidth identifier. Additionally, when a base station transmits a MAC CE containing an indicator to disable a specific cell to the terminal, the terminal may be characterized in that, if a dormant partial bandwidth is set for the cell, the terminal disables the specific cell according to the instructions in the MAC CE and switches to the dormant partial bandwidth. The terminal may reduce terminal battery consumption and enable rapid partial bandwidth activation by not performing PDCCH monitoring or data transmission / reception in the dormant partial bandwidth of the specific cell, but by performing channel measurement reporting. Furthermore, if data transmission / reception is required for a disabled cell switched to the dormant partial bandwidth, the base station transmits a MAC CE containing an indicator to enable a specific cell to the terminal, and upon receiving the MAC CE, the terminal can activate the specific cell, switch to the initial active partial bandwidth, and activate it. Then, the terminal can monitor the PDCCH again in the switched partial bandwidth and start data transmission / reception. However, in the second embodiment of the present invention, when deactivation is instructed for a specific cell via an RRC message, all partial bandwidths may be deactivated even if a dormant partial bandwidth is set for the specific cell. Furthermore, when the terminal receives an instruction to deactivate the cell via MAC CE for the cell deactivated by the RRC message, if a dormant partial bandwidth is set for the cell, the terminal can activate the dormant partial bandwidth, perform operations in the dormant partial bandwidth, and start a channel measurement report.

[0499] In the second embodiment of the present invention, the operation or use of a dormant partial bandwidth in a cell that is in an inactive state may be characterized. Additionally, in the second embodiment of the present invention, switching the partial bandwidth to a dormant partial bandwidth may be characterized as instructing switching for the downlink partial bandwidth. This is because the operation of not monitoring the PDCCH and the operation of performing a channel measurement report are operations for the downlink partial bandwidth of the cell of the terminal.

[0500] In the second embodiment of the present invention, the state for the cell (e.g., SCell) is maintained and operated in an active state or an inactive state and supports state transitions between each state, and the state for the partial bandwidth is maintained and operated in an active state, a sleep state, or an inactive state, and state transitions or switching of the partial bandwidth are operated according to the cell state.

[0502] The 2-1 embodiment regarding specific operation according to the cell state (activated state or deactivated state) of the MAC layer device according to the 2nd embodiment of the present invention is as follows.

[0503] - If the terminal is instructed to operate with the sleep portion bandwidth for the serving cell (PCell or SCell), or if an instruction to disable the cell is received via a MAC CE or RRC message, or if an instruction to switch the portion bandwidth (e.g., downlink portion bandwidth) to the sleep portion bandwidth is received via the DCI (L1 control signal) of the PDCCH or a MAC CE or RRC message, or if a cell disable timer was set and the timer has expired, one or more of the following operations may be performed.

[0504] ■ If a dormant partial bandwidth is set in this serving cell, switch to the downlink partial bandwidth with the partial bandwidth indicated by the dormant partial bandwidth identifier. Alternatively, put the said partial bandwidth into dormancy.

[0505] ■ Disables uplink bandwidth.

[0506] ■ Stop the cell disable timer that is set or running in the above cell or partial bandwidth.

[0507] ■ If the partial bandwidth disable timer configured for the partial bandwidth of the above cell is running, the said partial bandwidth disable timer is stopped. This is to prevent unnecessary partial bandwidth switching procedures in the above cell.

[0508] ■ Periodic downlink assignment resources (DL SPS or configured downlink assignment) or periodic uplink assignment resources (UL SPS or configured uplink grant Type 2) configured in the partial bandwidth of the cell above can be cleared. The meaning of "clearing" above is that while the terminal stores configuration information, such as period information set in the RRC message, the information regarding periodic assignment resources indicated or activated by L1 signaling (e.g., DCI) is removed and no longer used. The method proposed above, that is, the operation of clearing periodic downlink assignment resources (DL SPS or configured downlink assignment) or periodic uplink assignment resources (UL SPS or configured uplink grant), may be performed only when the partial bandwidth transitions from an active state to a dormant state. This is because when the partial bandwidth transitions from an inactive state to a dormant state, there is no information regarding periodic assignment resources indicated or activated by L1 signaling. Alternatively, the periodic transmission resources can be released only when the periodic downlink transmission resources or periodic uplink transmission resources are set or are set and in use.

[0509] ■ The periodic uplink transmission resource (configured uplink grant Type 1 configured via RRC) set in the partial bandwidth of the cell above can be suspended. The meaning of "suspending" above is that the terminal stores the transmission resource configuration information set in the RRC message but no longer uses it. The method proposed above, that is, the operation of suspending the configured periodic uplink transmission resource (configured uplink grant Type 1), may be performed only when the partial bandwidth transitions from an active state to a dormant state. This is because when the partial bandwidth transitions from an inactive state to a dormant state, the periodic transmission resource is not being used. Alternatively, the periodic transmission resources may be released only when the periodic downlink transmission resource or the periodic uplink transmission resource is configured or is configured and in use.

[0510] ■ Clear all HARQ buffers set in the above uplink or downlink partial bandwidth.

[0511] ■ The terminal does not transmit SRS for the uplink portion bandwidth of the above cell.

[0512] ■ If a sleep portion bandwidth is set in the above cell, the terminal performs channel measurements (such as CSI, CQI, PMI, RI, PTI, or CRI) for the downlink according to the base station's settings and performs measurement reports in the sleep portion bandwidth. For example, channel or frequency measurement reports may be performed periodically.

[0513] ■ Uplink data is not transmitted via UL-SCH in the partial bandwidth of the above cell.

[0514] ■ Random access procedures are not performed on the partial bandwidth of the above cell.

[0515] ■ In the partial bandwidth of the above cell, the terminal does not monitor the PDCCH.

[0516] ■ The terminal does not monitor the PDCCH for the partial bandwidth of the cell. However, if a dormant partial bandwidth is set for the cell, in the case of cross-scheduling, the scheduled cell (e.g., PCell) may monitor the PDCCH for the cell (e.g., SCell) and receive instructions.

[0517] ■ PUCCH or SPUCCH transmission is not performed within the partial bandwidth of the above cell.

[0518] ■ If a dormant partial bandwidth is set in the above cell, the downlink partial bandwidth is put into dormancy to perform and report channel measurements, while the uplink partial bandwidth of the above cell is disabled and not used. This is because in a dormant Scell, channel measurements are performed only on the downlink partial bandwidth, and the measurement results are reported as the uplink partial bandwidth of the Spcell (Pcell or Pscell) or the Scell ​​containing the PUCCH.

[0519] In the present invention, the terminal operation for the active Band Width Part (active BWP) is as follows.

[0520] - If a partial bandwidth (e.g., downlink partial bandwidth) of the current cell (PCell or SCell) or an instruction to activate said cell is received via the DCI (L1 control signal) or MAC CE or RRC message of the PDCCH, or if an instruction to switch the partial bandwidth (e.g., downlink partial bandwidth) to the active partial bandwidth (or partial bandwidth other than the dormant partial bandwidth) is received via the DCI (L1 control signal) or MAC CE or RRC message of the PDCCH (in the case where the instruction is received via the L1 control signal of the PDCCH above, the instruction may be received from the PDCCH of its own cell via self-scheduling, or the instruction may be received from the PDCCH for said cell in the PCell via cross-carrier scheduling), one or more of the following operations may be performed.

[0521] ■ Switch to and activate the uplink or downlink partial bandwidth indicated above. Alternatively, switch the uplink or downlink partial bandwidth to a specified partial bandwidth (e.g., uplink or uplink initial activation partial bandwidth) and activate the said partial bandwidth.

[0522] ■ A Sounding Reference Signal (SRS) is transmitted within the above-mentioned activated partial bandwidth to enable the base station to perform channel measurements for the uplink. For example, it can be transmitted periodically.

[0523] ■ If PUCCH is configured in the above-mentioned activated partial bandwidth, perform PUCCH transmission.

[0524] ■ Regarding the above, the partial bandwidth or cell deactivation timer is started or restarted. Alternatively, the partial bandwidth or cell deactivation timer may be started or restarted only if the partial bandwidth or cell sleep timer is not set. In the above, if the partial bandwidth or cell sleep timer can be set via an RRC message, the partial bandwidth or cell may be put into sleep upon the expiration of the timer. For example, the partial bandwidth or cell deactivation timer may be started or restarted only in the sleep partial bandwidth or cell.

[0525] ■ If there is a Type 1 configured transmission resource that has been deactivated, the stored Type 1 transmission resource can be initialized to its original configuration and used. In the above, the Type 1 configured transmission resource refers to a periodic transmission resource (uplink or downlink) that is pre-allocated via an RRC message and can be activated and used via an RRC message.

[0526] ■ Trigger PHR for the above partial bandwidth.

[0527] ■ In the above-mentioned activated partial bandwidth, the terminal may report channel measurement results (such as CSI, CQI, PMI, RI, PTI, or CRI) for the downlink according to the base station settings.

[0528] ■ Monitor the PDCCH to read instructions from the base station in the above-mentioned activated partial bandwidth.

[0529] ■ Monitor PDCCH to read cross-scheduling for the above-mentioned activated partial bandwidth.

[0530] ■ The partial bandwidth disable timer is started or restarted as described above. Alternatively, the partial bandwidth disable timer may be started or restarted only if the partial bandwidth sleep timer is not set. If the partial bandwidth sleep timer described above can be set via an RRC message, the partial bandwidth may be switched to a sleep state or a sleep partial bandwidth upon the timer's expiration. For example, the partial bandwidth disable timer may be started or restarted only in the sleep partial bandwidth.

[0531] ■ If a link partial bandwidth sleep timer is set for the above partial bandwidth,

[0532] ■ Start or restart the partial bandwidth sleep timer for the above partial bandwidth.

[0533] In the present invention, various embodiments can be configured and operated by fusing or extending the first or second embodiment or the second embodiment that operates state transitions and corresponding operations in partial bandwidth units. For example, another third embodiment that operates state transitions and corresponding operations in partial bandwidth units may be as follows.

[0534] In the third embodiment, as shown in FIG. 1f, when setting multiple partial bandwidths per cell to a terminal via an RRC message, the dormant partial bandwidth is set using an indicator or partial bandwidth identifier. Additionally, the base station instructs the active cell to switch the partial bandwidth to the dormant partial bandwidth using the DCI of the L1 signaling PDCCH. In the dormant partial bandwidth, monitoring of the PDCCH is not performed, and data transmission and reception are not performed, but channel measurement reporting is performed, thereby reducing terminal battery consumption and enabling rapid partial bandwidth activation. In the above, the base station may instruct the partial bandwidth switching by transmitting the DCI of the L1 signaling PDCCH from the cell (self-scheduling) or from the PCell (cross-carrier scheduling).

[0535] And if data transmission and reception is required for an active cell that has been switched to the above-mentioned dormant partial bandwidth, the base station can transmit a MAC CE including an indicator to activate the cell to the terminal, thereby instructing the active cell to switch the dormant partial bandwidth to a non-dormant partial bandwidth (or active partial bandwidth) among the multiple partial bandwidths set by the RRC message, and then monitor the PDCCH again in the switched partial bandwidth and start data transmission and reception.

[0536] In addition, if the base station transmits a MAC CE containing an indicator for deactivating a cell to the terminal, the terminal may deactivate the uplink or downlink partial bandwidth of the specific cell and perform the deactivation operations proposed in the present invention. In the third embodiment of the present invention, the partial bandwidth may be characterized as not being operated or used in a cell that is in a deactivated state. Furthermore, in the third embodiment of the present invention, switching the partial bandwidth to a dormant partial bandwidth may be characterized as indicating switching for the downlink partial bandwidth, and switching the dormant partial bandwidth to an active partial bandwidth may be characterized as being performed by the cell activation indicator of the MAC CE. Specific operations regarding the cell state and partial bandwidth switching operations may be performed based on the first embodiment or the second embodiment or the operations proposed in the second embodiment of the present invention.

[0537] In this way, various embodiments can be configured and operated by fusing or expanding the first, second, or third embodiment of the present invention.

[0539] FIG. 11 is a diagram showing MAC control information indicating a state transition to an active state, a dormant state, or an inactive state proposed in the present invention.

[0541] The activation and deactivation MAC CE proposed in the present invention may have a structure illustrated in FIG. 11 as an example, and may be divided into a MAC CE structure having a size of 1 byte supporting 7 Scells (1l-05) and a MAC CE structure having a size of 4 bytes supporting 31 Scells (1l-10). It also has the following characteristics.

[0542] - When the dormant MAC CE is not received and only the active and deactivated MAC CEs are received, the terminal behavior is as follows.

[0543] ■ Activation and Deactivation: Each field of the MAC CE represents a Scell ​​identifier, and the value corresponding to each field indicates whether the Scell ​​is activated or deactivated. If the indicator value for the Scell ​​represented by the Scell ​​identifier is 1, the Scell ​​is activated if its status is in a deactivated state. However, if the Scell's status is not in a deactivated state, the indicator value is ignored. If the indicator value for the Scell ​​represented by the Scell ​​identifier is 0, the Scell ​​is deactivated. In other words, regardless of the Scell's status, if the indicator value for the Scell ​​is 0, the Scell ​​is deactivated.

[0544] The dormant MAC CE proposed in the present invention may have a structure illustrated in FIG. 11 as an example, and the dormant MAC CE may be divided into a MAC CE structure having a size of 1 byte supporting 7 Scells (1l-05) and a MAC CE structure having a size of 4 bytes supporting 31 Scells (1l-05). It also has the following features.

[0545] - When the activating and deactivating MAC CEs are not received, and only the dormant MAC CE is received, the terminal behavior is as follows.

[0546] ■ Each field of the MAC CE represents each Scell ​​identifier, and the value corresponding to each field indicates whether the Scell ​​is activated or dormant. If the value of the indicator for the Scell ​​represented by the Scell ​​identifier is 1, the Scell ​​is put into dormancy. That is, regardless of the state of the Scell, if the value of the indicator for the Scell ​​is 1, the Scell ​​is put into dormancy. If the value of the indicator for the Scell ​​represented by the Scell ​​identifier is 0, the Scell ​​is activated if the Scell ​​is in a dormant state. However, if the Scell ​​is in a state other than a dormant state, the indicator value is ignored.

[0548] - When an active and inactive MAC CE and a dormant MAC CE are received simultaneously on a single MAC layer device, the terminal behavior is as follows.

[0549] Each field of the Activation and Deactivation MAC CE and the Sleeping MAC CE represents each Scell ​​identifier, and the combination of values ​​corresponding to each field indicates a state transition of the Scell, such as activation, sleep, or deactivation. The Activation and Deactivation MAC CE and the Sleeping MAC CE may be received together as MAC CEs of size 1 byte or MAC CEs of size 4 bytes in a single MAC layer device. When the two types of MAC CEs are received together, the state transition of each Scell ​​indicated by the MAC CEs can be determined according to the combination of the indicated values ​​of each MAC CE as shown in the following table.

[0550] Hibernation MAC control element C i Activation / Deactivation MAC control element C i SCell shall be 0 0 Deactivated 0 1 Activated 1 0 Reserved MAC control element combination 1 1 Dormant

[0552] State instructions for activation, deactivation, and dormancy per link can be performed using the R field included in the structure of the cell activation and deactivation MAC CE or cell dormancy MAC CE proposed above. For example, if the R field is 0, it indicates that the downlink of the cell should be transitioned to an activated, deactivated, or dormant state, and if the R field is 1, it indicates that the uplink of the cell should be transitioned to an activated, deactivated, or dormant state. Alternatively, the R field can be defined and used to indicate only the state transition of the downlink (or uplink). Additionally, state transitions can be indicated for each cell and each link by defining a MAC CE that includes each cell identifier and each link indicator or state indicator, as in 1l-15.

[0554] In addition, a new MAC CE can be designed to support the embodiments of the present invention and extend to various embodiments, or existing MAC CE functions can be extended.

[0555] For example, the MAC CEs proposed and described in FIG. 11 of the present invention may be applied, and the functions described in FIG. 11 of the present invention may be extended and applied by extending the reserved bit (R bit) in 1l-05 or 1l-10 in FIG. 11.

[0556] - For example, when the reserved bit is set to 0, a 1-bit indicator indicating the identifier of each cell (SCell) can be defined and used as follows.

[0557] ■ If the 1-bit indicator is set to 0, the state transition for the cell or partial bandwidth can be performed as follows.

[0558] ◆ Transition cells or partial bandwidths that were in a disabled state to a disabled state or maintain them as they are.

[0559] ◆ Cells or partial bandwidths that were in an active state transition to an inactive state

[0560] ◆ Cells or partial bandwidths that were in a dormant state transition to an inactive state

[0561] ■ If the 1-bit indicator is set to 1, the state transition for the cell or partial bandwidth can be performed as follows.

[0562] ◆ Transition active cells or partial bandwidths to an active state or maintain them as they are.

[0563] ◆ Cells or partial bandwidths that were inactive transition to an active state

[0564] ◆ Cells or partial bandwidths that were in a dormant state are transitioned to a dormant state or maintained as they are.

[0566] - If the reserved bit is set to 1, the 1-bit indicator indicating the identifier of each cell (SCell) can be defined and used as follows. Alternatively, a new logical identifier can be defined and a new MAC CE defined and used as follows.

[0567] ■ If the 1-bit indicator is set to 0, the state transition for the cell or partial bandwidth can be performed as follows.

[0568] ◆ Transition active cells or partial bandwidths to an active state or maintain them as they are.

[0569] ◆ Cells or partial bandwidths that were in a dormant state transition to an active state

[0570] ◆ Transition cells or partial bandwidths that were in a disabled state to a disabled state or maintain them as they are.

[0571] ■ If the 1-bit indicator is set to 1, the state transition for the cell or partial bandwidth can be performed as follows.

[0572] ◆ Cells or partial bandwidths that were in an active state transition to a dormant state

[0573] ◆ Cells or partial bandwidths that were inactive transition to a dormant state

[0574] ◆ Cells or partial bandwidths that were in a dormant state are transitioned to a dormant state or maintained as they are.

[0575] The functions of the MAC CE described above as examples can be expanded in various ways and designed to indicate state transitions or switching of cells or partial bandwidths, and applied to the above embodiments of the present invention.

[0576] FIG. 1m is a diagram illustrating a specific terminal operation in the present invention in which the terminal reads PDCCH according to scheduling setting information for each cell and performs a partial bandwidth switching procedure.

[0577] An example (1m-01) of the specific operation of the terminal of the present invention is as follows.

[0578] - 1> If the serving cell's scheduling configuration information includes self-scheduling configuration information (e.g., own identifier) ​​or cross-carrier scheduling configuration information (e.g., other identifier), and the cross-carrier scheduling configuration information includes a sleep portion bandwidth identifier or indicator (or if the scheduling configuration information includes a sleep portion bandwidth identifier or indicator, 1m-25), and if self-scheduling is configured in the current serving cell (if cross-carrier scheduling is not configured, 1m-05), the following first operation is performed (1m-30).

[0579] ■ 2> If the active partial bandwidth of the current serving cell (SCell) is the first partial bandwidth

[0580] ◆ 3> By applying the cross-carrier scheduling method, the cell designated as the scheduling cell (or the cell receiving the scheduling instruction, scheduling cell) in the above scheduling setting information receives the PDCCH, and the current serving cell (SCell) does not receive the PDCCH.

[0581] ◆ 3> If the received PDCCH above instructs partial bandwidth switching to the first partial bandwidth,

[0582] ● 4> Apply the above-mentioned first method, second method, third method, fourth method, or fifth method. For example, switch to the partial bandwidth indicated by the above DCI and ignore the data corresponding to the downlink transmission resource indicated by the above DCI without receiving it.

[0583] ◆ 3> If the received PDCCH above instructs partial bandwidth switching to the second partial bandwidth,

[0584] ● 4> Switch to the partial bandwidth indicated by the above DCI, receive data corresponding to the downlink transmission resource indicated by the above DCI, and transmit a corresponding HARQ ACK or NACK.

[0585] ■ 2> If the active partial bandwidth of the current serving cell (SCell) is the second partial bandwidth

[0586] ◆ 3> In the above scheduling setting information, the cell designated as the scheduling cell (or the cell receiving the scheduling instruction) does not receive the PDCCH, and the self-scheduling method is applied to receive the PDCCH in the active partial bandwidth of the current serving cell (SCell).

[0587] ◆ 3> If the received PDCCH above instructs partial bandwidth switching to the first partial bandwidth,

[0588] ● 4> Apply the above-mentioned first method, second method, third method, fourth method, or fifth method. For example, switch to the partial bandwidth indicated by the above DCI and ignore the data corresponding to the downlink transmission resource indicated by the above DCI without receiving it.

[0589] ◆ 3> If the received PDCCH above instructs partial bandwidth switching to the second partial bandwidth,

[0590] ● 4> Switch to the partial bandwidth indicated by the above DCI, receive data corresponding to the downlink transmission resource indicated by the above DCI, and transmit a corresponding HARQ ACK or NACK.

[0591] - 1> If the scheduling configuration information of the serving cell includes self-scheduling configuration information (e.g., own identifier) ​​or cross-carrier scheduling configuration information (e.g., other identifier), and the cross-carrier scheduling configuration information (Cross carrier scheduling) does not include a sleep portion bandwidth identifier or indicator (or if the scheduling configuration information does not include a sleep portion bandwidth identifier or indicator, 1m-25), and if self-scheduling is configured in the current serving cell (if cross-carrier scheduling is not configured, 1m-05), the following second operation is performed (1m-35).

[0592] ■ 2> Based on the above scheduling settings, receive and read PDCCH in the active partial bandwidth of the current cell using the self-scheduling method. Cross-carrier scheduling is not applied.

[0593] ■ 2> If the received PDCCH above instructs partial bandwidth switching to the second partial bandwidth,

[0594] ◆ 3> Switch to the partial bandwidth indicated by the above DCI, receive data corresponding to the downlink transmission resource indicated by the above DCI, and transmit a corresponding HARQ ACK or NACK.

[0595] - 1> If the serving cell's scheduling configuration information includes self-scheduling configuration information (e.g., own identifier) ​​or cross-carrier scheduling configuration information (e.g., other identifier), and the cross-carrier scheduling configuration information includes a dormant partial bandwidth identifier or indicator (or if the scheduling configuration information includes a dormant partial bandwidth identifier or indicator, 1m-10), and cross-carrier scheduling is configured in the current serving cell (if self-scheduling is not configured, 1m-05), the following third operation is performed (1m-15).

[0596] ■ 2> By applying the cross-carrier scheduling method, the cell designated as the scheduling cell (or the cell receiving the scheduling instruction, scheduling cell) in the above scheduling setting information receives the PDCCH, and the current serving cell (SCell) does not receive the PDCCH.

[0597] ■ 2> If the received PDCCH above instructs partial bandwidth switching to the first partial bandwidth,

[0598] ◆ 3> Apply the above-mentioned first method, second method, third method, fourth method, or fifth method. For example, switch to the partial bandwidth indicated by the above-mentioned DCI and ignore the data corresponding to the downlink transmission resource indicated by the above-mentioned DCI without receiving it.

[0599] ■ 2> If the received PDCCH above instructs partial bandwidth switching to the second partial bandwidth,

[0600] ◆ 3> Switch to the partial bandwidth indicated by the above DCI, receive data corresponding to the downlink transmission resource indicated by the above DCI, and transmit a corresponding HARQ ACK or NACK.

[0601] - 1> If the serving cell's scheduling configuration information includes self-scheduling configuration information (e.g., own identifier) ​​or cross-carrier scheduling configuration information (e.g., other identifier), and the cross-carrier scheduling configuration information does not include a sleep portion bandwidth identifier or indicator (or if the scheduling configuration information does not include a sleep portion bandwidth identifier or indicator, 1m-10), and cross-carrier scheduling is configured in the current serving cell (if self-scheduling is not configured, 1m-05), the following 4th operation is performed (1m-20).

[0602] ■ 2> Based on the above scheduling setting information, PDCCH is received and read from the active partial bandwidth of the cell that performs the scheduling indicated in the above scheduling setting information using the cross-carrier scheduling method. Self-scheduling is not applied.

[0603] ■ 2> If the received PDCCH above instructs partial bandwidth switching to the second partial bandwidth,

[0604] ◆ 3> Switch to the partial bandwidth indicated by the above DCI, receive data corresponding to the downlink transmission resource indicated by the above DCI, and transmit a corresponding HARQ ACK or NACK.

[0606] Figure 1n illustrates the structure of a terminal to which an embodiment of the present invention can be applied.

[0607] Referring to the drawing above, the terminal includes an RF (Radio Frequency) processing unit (1n-10), a baseband, a processing unit (1n-20), a storage unit (1n-30), and a control unit (1n-40).

[0608] The RF processing unit (1n-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (1n-10) up-converts the baseband signal provided by the baseband processing unit (1n-20) into an RF band signal and transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (1n-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC (digital to analog converter), an ADC (analog to digital converter), etc. Although only one antenna is shown in the drawing, the terminal may be equipped with multiple antennas. In addition, the RF processing unit (1n-10) may include multiple RF chains. Furthermore, the RF processing unit (1n-10) may perform beamforming. For the above beamforming, the RF processing unit (1n-10) can adjust the phase and magnitude of each of the signals transmitted and received through multiple antennas or antenna elements. Additionally, the RF processing unit can perform MIMO and can receive multiple layers when performing MIMO operation. The RF processing unit (1n-10) can perform receiving beam sweeping by appropriately setting multiple antennas or antenna elements according to the control of the control unit, or can adjust the direction and beam width of the receiving beam so that the receiving beam is coordinated with the transmitting beam.

[0609] The baseband processing unit (1n-20) performs a conversion function between a baseband signal and a bit sequence according to the physical layer specifications of the system. For example, when transmitting data, the baseband processing unit (1n-20) generates complex symbols by encoding and modulating the transmitted bit sequence. Additionally, when receiving data, the baseband processing unit (1n-20) restores the received bit sequence by demodulating and decoding the baseband signal provided by the RF processing unit (1n-10). For example, in the case of following the orthogonal frequency division multiplexing (OFDM) method, when transmitting data, the baseband processing unit (1n-20) generates complex symbols by encoding and modulating the transmitted bit sequence, maps the complex symbols to subcarriers, and then constructs OFDM symbols through inverse fast Fourier transform (IFFT) operations and cyclic prefix (CP) insertion. Additionally, upon receiving data, the baseband processing unit (1n-20) divides the baseband signal provided by the RF processing unit (1n-10) into OFDM symbol units, restores the signals mapped to subcarriers through a fast Fourier transform (FFT) operation, and then restores the received bit sequence through demodulation and decoding.

[0610] The baseband processing unit (1n-20) and the RF processing unit (1n-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (1n-20) and the RF processing unit (1n-10) may be referred to as a transmitting unit, a receiving unit, a transmitting and receiving unit, or a communication unit. Furthermore, at least one of the baseband processing unit (1n-20) and the RF processing unit (1n-10) may include a plurality of communication modules to support a plurality of different wireless access technologies. Additionally, at least one of the baseband processing unit (1n-20) and the RF processing unit (1n-10) may include different communication modules to process signals of different frequency bands. For example, the different wireless access technologies may include LTE networks, NR networks, etc. In addition, the above different frequency bands may include super high frequency (SHF) bands (e.g., 2.5 GHz, 5 GHz) and millimeter wave (e.g., 60 GHz) bands.

[0611] The storage unit (1n-30) stores data such as a basic program, an application program, and setting information for the operation of the terminal. The storage unit (1n-30) provides the stored data upon a request from the control unit (1n-40).

[0612] The control unit (1n-40) controls the overall operations of the terminal. For example, the control unit (1n-40) transmits and receives signals through the baseband processing unit (1n-20) and the RF processing unit (1n-10). Additionally, the control unit (1n-40) writes and reads data to and from the storage unit (1n-40). To this end, the control unit (1n-40) may include at least one processor. For example, the control unit (1n-40) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as applications.

[0613] FIG. 10 illustrates the block configuration of a TRP in a wireless communication system to which an embodiment of the present invention can be applied.

[0614] As illustrated in the drawing above, the base station is configured to include an RF processing unit (10-10), a baseband processing unit (10-20), a backhaul communication unit (10-30), a storage unit (10-40), and a control unit (10-50).

[0615] The RF processing unit (10-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (10-10) upconverts the baseband signal provided by the baseband processing unit (10-20) into an RF band signal, transmits it through an antenna, and downconverts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (10-10) may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Although only one antenna is shown in the drawing, the first connection node may be equipped with multiple antennas. Additionally, the RF processing unit (10-10) may include multiple RF chains. Furthermore, the RF processing unit (10-10) may perform beamforming. For the above beamforming, the RF processing unit (10-10) can adjust the phase and magnitude of each of the signals transmitted and received through a plurality of antennas or antenna elements. The RF processing unit can perform down-to-down MIMO operation by transmitting one or more layers.

[0616] The baseband processing unit (10-20) performs a conversion function between a baseband signal and a bit sequence according to the physical layer specifications of the first wireless access technology. For example, when transmitting data, the baseband processing unit (10-20) generates complex symbols by encoding and modulating the transmitted bit sequence. Additionally, when receiving data, the baseband processing unit (10-20) restores the received bit sequence by demodulating and decoding the baseband signal provided by the RF processing unit (10-10). For example, in the case of following the OFDM method, when transmitting data, the baseband processing unit (10-20) generates complex symbols by encoding and modulating the transmitted bit sequence, maps the complex symbols to subcarriers, and then constructs OFDM symbols through IFFT operation and CP insertion. Additionally, upon receiving data, the baseband processing unit (10-20) divides the baseband signal provided by the RF processing unit (10-10) into OFDM symbol units, restores the signals mapped to subcarriers through FFT operations, and then restores the received bit sequence through demodulation and decoding. The baseband processing unit (10-20) and the RF processing unit (10-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (10-20) and the RF processing unit (10-10) may be referred to as a transmitting unit, a receiving unit, a transmitting and receiving unit, a communication unit, or a wireless communication unit.

[0617] The above communication unit (1o-30) provides an interface for communicating with other nodes in the network.

[0618] The storage unit (1o-40) stores data such as basic programs, application programs, and configuration information for the operation of the main station. In particular, the storage unit (1o-40) can store information regarding a bearer assigned to a connected terminal, measurement results reported from the connected terminal, etc. Additionally, the storage unit (1o-40) can store information that serves as a criterion for determining whether to provide or disconnect multiple connections to the terminal. Furthermore, the storage unit (1o-40) provides the stored data upon the request of the control unit (1o-50).

[0619] The control unit (10-50) controls the overall operations of the main station. For example, the control unit (10-50) transmits and receives signals through the baseband processing unit (10-20) and the RF processing unit (10-10) or through the backhaul communication unit (10-30). Additionally, the control unit (10-50) writes and reads data to and from the storage unit (10-40). To this end, the control unit (10-50) may include at least one processor.

[0621] Although specific embodiments have been described in the detailed description of the present invention, it is understood that various modifications are possible within the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof. Explanation of the symbols

[0622] Base Stations: 1a-05, 1a-10, 1a-15, 1a-20 MME: 1a-25 S-GW: 1a-30 Terminal: 1a-35

Claims

Claim 1 A method of a terminal in a communication system, comprising: receiving a radio resource control (RRC) message from a base station for setting up a SCell (secondary cell), the message including first information regarding an initial downlink bandwidth part (BWP) of the SCell, second information regarding a dormant BWP among one or more downlink BWPs of the SCell, and third information regarding a BWP that is activated by BWP switching from the dormant BWP among the one or more downlink BWPs; receiving downlink control information (DCI) from the base station via a primary cell (PCell) that directs BWP switching for the SCell, wherein the DCI includes a bitmap directing a downlink BWP to be activated for the SCell; and, based on the first information, the second information and the third information, performing BWP switching for the SCell from a currently active downlink BWP to the downlink BWP directed by the bitmap of the DCI; wherein a default downlink BWP is set for the SCell, and the DCI A method characterized by comprising: a step of starting or restarting a BWP deactivation timer associated with the downlink BWP indicated by the bitmap of the DCI when the downlink BWP indicated by the bitmap of the DCI is not the primary downlink BWP and the dormant BWP; and a step of starting or restarting a BWP deactivation timer associated with the downlink BWP indicated by the bitmap of the DCI when the primary downlink BWP is not set for the SCell and the downlink BWP indicated by the bitmap of the DCI is not the initial downlink BWP and the dormant BWP. Claim 2 A method according to claim 1, further comprising the step of transmitting HARQ (hybrid automatic repeat request) information for the DCI to the base station, wherein the DCI does not schedule downlink data reception. Claim 3 A method according to claim 1, wherein the DCI is one of a DCI including a downlink allocation or an uplink grant; or a DCI having a format different from the DCI format including the downlink allocation or the uplink grant, and not including the downlink allocation and the uplink grant. Claim 4 A method according to claim 1, wherein the step of performing the BWP switching for the SCell comprises: a step of setting the active downlink BWP for the SCell to the dormant BWP when the dormant BWP is indicated for the SCell by the bitmap; and a step of setting the active downlink BWP for the SCell to the BWP activated by BWP switching from the dormant BWP when the BWP activated for the SCell is indicated for the SCell by the bitmap, and the currently active downlink BWP for the SCell is the dormant BWP. Claim 5 A method of a base station in a communication system, comprising the step of transmitting a radio resource control (RRC) message to a terminal for setting up a SCell, the message comprising: first information regarding an initial downlink bandwidth part (BWP) of a SCell (secondary cell); second information regarding a dormant BWP among one or more downlink BWPs of the SCell; and third information regarding a BWP among the one or more downlink BWPs that is activated by BWP switching from the dormant BWP. The method includes the step of transmitting downlink control information (DCI) instructing BWP switching for the SCell to the terminal via a primary cell (PCell), wherein the DCI includes a bitmap instructing a downlink BWP to be activated for the SCell, and the BWP switching for the SCell from the currently active downlink BWP to the downlink BWP instructed by the bitmap of the DCI is performed based on the first information, the second information, and the third information, and if a default downlink BWP is set for the SCell and the downlink BWP instructed by the bitmap of the DCI is not the default downlink BWP and the dormant BWP, a BWP deactivation timer associated with the downlink BWP instructed by the bitmap of the DCI is started or restarted, and if the default downlink BWP is not set for the SCell and the downlink BWP instructed by the bitmap of the DCI is not the initial downlink BWP and the dormant BWP, the A method characterized in that the BWP disable timer associated with the downlink BWP indicated by the bitmap of the DCI is started or restarted. Claim 6 A method according to claim 5, further comprising the step of receiving HARQ (hybrid automatic repeat request) information for the DCI from the terminal, wherein the DCI does not schedule downlink data reception. Claim 7 A method according to claim 5, wherein the DCI is one of a DCI including a downlink allocation or an uplink grant; or a DCI having a format different from the DCI format including the downlink allocation or the uplink grant, but not including the downlink allocation and the uplink grant. Claim 8 A method according to claim 5, wherein if the dormant BWP is indicated for the SCell by the bitmap, the active downlink BWP for the SCell is set to the dormant BWP; if the bitmap indicates a BWP that is activated by BWP switching from the dormant BWP for the SCell, the currently active downlink BWP for the SCell is the dormant BWP, the active downlink BWP for the SCell is set to the BWP that is activated by BWP switching from the dormant BWP. Claim 9 In a terminal of a communication system, a transmitting and receiving unit; A radio resource control (RRC) message for configuring the SCell (secondary cell) is received from a base station, the message comprising: first information regarding the initial downlink bandwidth part (BWP) of the SCell (secondary cell) connected to the above-mentioned transceiver; second information regarding a dormant BWP among one or more downlink BWPs of the SCell; and third information regarding a BWP that is activated by BWP switching from the dormant BWP among the one or more downlink BWPs; and downlink control information (DCI) instructing BWP switching for the SCell is received from the base station via the PCell (primary cell), wherein the DCI includes a bitmap indicating the downlink BWP to be activated for the SCell; and based on the first information, the second information, and the third information, the BWP switching for the SCell from the currently active downlink BWP to the downlink BWP indicated by the bitmap of the DCI is performed, and a default downlink BWP is configured for the SCell, and the DCI A terminal characterized by including a control unit that, when the downlink BWP indicated by the bitmap is not the default downlink BWP and the dormant BWP, starts or restarts a BWP deactivation timer associated with the downlink BWP indicated by the bitmap of the DCI, and when the default downlink BWP is not set for the SCell and the downlink BWP indicated by the bitmap of the DCI is not the initial downlink BWP and the dormant BWP, starts or restarts the BWP deactivation timer associated with the downlink BWP indicated by the bitmap of the DCI. Claim 10 A terminal characterized in that, in claim 9, the control unit transmits HARQ (hybrid automatic repeat request) information for the DCI to the base station, and the DCI does not schedule downlink data reception. Claim 11 A terminal according to claim 9, wherein the DCI is one of a DCI including a downlink allocation or an uplink grant; or a DCI having a format different from the DCI format including the downlink allocation or the uplink grant, and not including the downlink allocation and the uplink grant. Claim 12 A terminal characterized in that, in claim 9, the control unit sets the active downlink BWP for the SCell to the dormant BWP when the dormant BWP is indicated for the SCell by the bitmap, and when the BWP activated by BWP switching from the dormant BWP is indicated for the SCell by the bitmap, and when the currently active downlink BWP for the SCell is the dormant BWP, the active downlink BWP for the SCell is set to the BWP activated by BWP switching from the dormant BWP. Claim 13 In a base station of a communication system, a transmitting and receiving unit; The system includes a control unit connected to the above-mentioned transceiver and transmitting to a terminal a radio resource control (RRC) message for setting up the SCell, the RRC including first information regarding the initial downlink bandwidth part (BWP) of the SCell (secondary cell), second information regarding a dormant BWP among one or more downlink BWPs of the SCell, and third information regarding a BWP that is activated by BWP switching from the dormant BWP among the one or more downlink BWPs, and transmitting downlink control information (DCI) indicating BWP switching for the SCell to the terminal via a primary cell (PCell), wherein the DCI includes a bitmap indicating the downlink BWP to be activated for the SCell, and the BWP switching for the SCell from the currently active downlink BWP to the downlink BWP indicated by the bitmap of the DCI is performed based on the first information, the second information, and the third information, and a default downlink BWP is set for the SCell, and the A base station characterized in that if the downlink BWP indicated by the bitmap of the DCI is not the default downlink BWP and the sleep BWP, the BWP disable timer associated with the downlink BWP indicated by the bitmap of the DCI is started or restarted, and if the default downlink BWP is not set for the SCell and the downlink BWP indicated by the bitmap of the DCI is not the initial downlink BWP and the sleep BWP, the BWP disable timer associated with the downlink BWP indicated by the bitmap of the DCI is started or restarted. Claim 14 A base station characterized in that, in paragraph 13, the control unit receives HARQ (hybrid automatic repeat request) information for the DCI from the terminal, and the DCI does not schedule downlink data reception. Claim 15 A base station according to claim 13, wherein the DCI is one of a DCI including a downlink allocation or an uplink grant; or a DCI having a format different from the DCI format including the downlink allocation or the uplink grant, and not including the downlink allocation and the uplink grant. Claim 16 A base station according to claim 13, wherein if the dormant BWP for the SCell is indicated by the bitmap, the active downlink BWP for the SCell is set to the dormant BWP; if the bitmap indicates a BWP that is activated by BWP switching from the dormant BWP for the SCell, the currently active downlink BWP for the SCell is the dormant BWP, the active downlink BWP for the SCell is set to the BWP that is activated by BWP switching from the dormant BWP.

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