CN116134921A - Terminal and communication method - Google Patents

Abstract

The terminal has: a receiving unit that receives control information, which is layer 1 signaling, from a base station, the control information including a field indicating activation or deactivation for one or more secondary cells; and a control unit that causes a specific secondary cell among the one or more secondary cells to transition to an active state or an inactive state, based on the control information.

Description

Terminal and communication method

Technical Field

The present invention relates to a terminal and a communication method in a wireless communication system.

Background

In NR (New Radio) which is a subsequent system of LTE (Long Term Evolution: long term evolution), a technology of satisfying a large capacity system, a high data transmission rate, low delay, simultaneous connection of a plurality of terminals, low cost, power saving, and the like as a requirement has been studied (for example, non-patent document 1).

In NR version 16, a secondary cell dormancy notification (Secondary cell dormancy indication) function is supported in an MR-DC (Multi-Radio Dual Connectivity: multi-radio dual connection)/CA (Carrier Aggregation: carrier aggregation) enhanced work item (for example, non-patent document 2). For the purpose of power saving, either a dormant state (dormant) or a non-dormant state (non-dormant) is notified to a secondary cell or a group of secondary cells by DCI (Downlink control information: downlink information) during an active period of DRX (Discontinuous reception: discontinuous reception). In the secondary cell to which the sleep state is notified, for example, the terminal does not perform monitoring of the PDCCH (Physical Downlink Control Channel: physical downlink control channel).

Prior art literature

Non-patent literature

Non-patent document 1:3GPP TS 38.300V 16.0.0 (2019-12)

Non-patent document 2:3GPP TS 38.212V 16.0.0 (2019-12)

Disclosure of Invention

Problems to be solved by the invention

In MR-DC/CA, migration related to the sleep state of the secondary cell can be done through layer 1 signaling. However, the migration related to the activation state of the secondary cell cannot be set by layer 1 signaling, creating a delay.

The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce delay associated with state transition of a cell in a wireless communication system.

Means for solving the problems

According to the disclosed technology, there is provided a terminal having: a reception unit that receives control information, which is layer 1 signaling, from a base station, the control information including a field' indicating activation or deactivation for one or more secondary cells; and a control unit that causes a specific secondary cell among the one or more secondary cells to transition to an active state or an inactive state, based on the control information.

Effects of the invention

According to the disclosed technology, in a wireless communication system, delay related to state transition of a cell can be reduced.

Drawings

Fig. 1 is a diagram showing a configuration example of a wireless communication system according to an embodiment of the present invention.

Fig. 2 is a diagram showing an example of control information for performing a state change of a cell.

Fig. 3 is a diagram for explaining an example of actions related to the sleep state.

Fig. 4 is a timing chart for explaining an example of actions related to state transition of a cell in the embodiment of the present invention.

Fig. 5 is a diagram showing an example (1) of control information in the embodiment of the present invention.

Fig. 6 is a diagram showing an example (2) of control information in the embodiment of the present invention.

Fig. 7 is a flowchart for explaining an example (1) of state transition of a cell in the embodiment of the present invention.

Fig. 8 is a flowchart for explaining an example (2) of state transition of a cell in the embodiment of the present invention.

Fig. 9 is a diagram showing an example of the functional configuration of the base station 10 in the embodiment of the present invention.

Fig. 10 is a diagram showing an example of the functional configuration of the terminal 20 according to the embodiment of the present invention.

Fig. 11 is a diagram showing an example of a hardware configuration of the base station 10 or the terminal 20 according to the embodiment of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

The wireless communication system according to the embodiment of the present invention can appropriately use the prior art when operating. This prior art is for example, but not limited to, existing LTE. In addition, the term "LTE" as used in this specification has a broad meaning including LTE-Advanced and beyond (e.g., NR) unless otherwise indicated.

In the embodiments of the present invention described below, terms such as SS (Synchronization signal: synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel: physical broadcast channel), PRACH (Physical random access channel: physical random access channel), PDCCH (Physical Downlink Control Channel: physical downlink control channel), PDSCH (Physical Downlink Shared Channel: physical downlink shared channel), PUCCH (Physical Uplink Control Channel: physical uplink control channel), PUSCH (Physical Uplink Shared Channel: physical uplink shared channel) and the like used in conventional LTE are used. For convenience of explanation, the same signals, functions, and the like as those described above may be referred to by other names. Furthermore, the above terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even the signal used in NR is not necessarily expressed as "NR-".

In the embodiment of the present invention, the Duplex (Duplex) scheme may be a TDD (Time Division Duplex: time division Duplex) scheme, an FDD (Frequency Division Duplex: frequency division Duplex) scheme, or a scheme other than this (for example, flexible Duplex) scheme.

In the embodiment of the present invention, the radio parameters to be "configured" may be a predetermined value to be set (Pre-configured), or the radio parameters to be notified from the base station 10 or the terminal 20 may be set.

Fig. 1 is a diagram for explaining a wireless communication system according to an embodiment of the present invention. As shown in fig. 1, the wireless communication system in the embodiment of the present invention includes a base station 10 and a terminal 20. In fig. 1, 1 base station 10 and 1 terminal 20 are shown, respectively, but this is only an example, and may have a plurality of base stations, respectively.

The base station 10 is a communication device that provides 1 or more cells and performs wireless communication with the terminal 20. The physical resources of the wireless signal are defined by a time domain, which may be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing: orthogonal frequency division multiplexing) symbols, and a frequency domain, which may be defined by the number of subcarriers or the number of resource blocks. The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signals are for example NR-PSS and NR-SSS. The system information is transmitted, for example, through NR-PBCH, also called broadcast information. As shown in fig. 1, a base station 10 transmits control signals or data to a terminal 20 through DL (Downlink: uplink) and receives control signals or data from the terminal 20 through UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to transmit and receive signals. Further, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) -based communication in DL or UL. Further, both the base station 10 and the terminal 20 can communicate via a Secondary Cell (SCell: secondary Cell) and a Primary Cell (PCell: primary Cell) based on CA (Carrier Aggregation: carrier aggregation). In addition, the terminal 20 can communicate via the primary cell of the DC-based (Dual Connectivity: dual-connection) base station 10 and the primary and secondary cell group cell (PScell: primary Secondary cell group Cell) of other base stations 10.

The terminal 20 is a communication device having a wireless communication function, such as a smart phone, a mobile phone, a tablet computer, a wearable terminal, and a communication module for M2M (Machine-to-Machine), and as shown in fig. 1, the terminal 20 receives a control signal or data from the base station 10 through DL and transmits the control signal or data to the base station 10 through UL, thereby utilizing various communication services provided by a wireless communication system.

In the case of NR or CA/DC of LTE, the state of the secondary cell is defined. In the active state, monitoring of control signals, transmission and reception of data, and transmission and reception of control signals are performed, and as related operations, for example, CSI (Channel State Information: channel state information) measurement, CSI reporting, and the like are performed. In the inactive (inactive) state, monitoring of control signals, transmission and reception of data, transmission and reception of control signals are not performed, and CSI measurement, CSI reporting, and the like are not performed. In NR version 17, an efficient activation/deactivation (de-activation) mechanism of the secondary cell was studied.

Fig. 2 is a diagram showing a state of performing a cellA diagram of an example of changed control information. The migration of the active state and the inactive state of the secondary cell can be performed by notification or a timer based on such MAC (Medium Access Control: media access Control) -CE (Control Element) as shown in fig. 2. Let i be the index of the secondary cell, C shown in FIG. 2 _i When set to 1, is activated, and shifts to the activated state, when C shown in FIG. 2 _i When set to 0, the switch is deactivated and the switch is shifted to an inactive state. In the case where the MAC-CE is 1 octet, state transitions of the secondary cells with indices i of 1 to 7 are supported, and in the case where the MAC-CE is 4 octets, state transitions of the secondary cells with indices i of 1 to 31 are supported.

In NR or LTE, a Dormant (dorant) state is defined as a state of a secondary cell, in addition to the active state and the inactive state described above. In the sleep state, monitoring of control signals, transceiving of data, transceiving of control signals are not performed, but CSI measurement is performed.

In addition, when the state of the secondary cell is shifted from the inactive state to the active state, CSI measurement and CSI reporting are required after the shift, and thus time is required after the shift to before communication starts, and the delay increases. By introducing the sleep state and transitioning to the sleep state before transitioning to the active state, the delay until transitioning to the active state can be reduced.

In addition, in NR, BWP (Bandwidth Part) is introduced. By applying BWP, the band in which the UE monitors control signals, transmits/receives data, and transmits control signals in the CC can be switched. In addition, by setting a parameter set different for each BWP, the parameter set can be immediately switched. In addition, when switching BWP, switching frequency bands is not necessary. For example, two BWP having different values set for parameters related to power consumption reduction are prepared, and by switching these BWP, parameters related to power consumption reduction can be switched. For example, a setting may be made such that BWP is activated, which is a normal power consumption, and BWP is dormant (dorman), which is a power consumption reduced compared with a normal one.

For example, in the case of BWP handover, it is assumed that "when there is no transmission/reception data (i.e., only control signal monitoring is performed)" and/or "when the traffic is small" BWP in the narrowband region is used, and "BWP in the wideband region is used in cases other than the above.

In addition, in NR version 16, the secondary cell dormancy notification (Secondary cell dormancy indication) function is supported in MR-DC (Multi-Radio Dual Connectivity: multi-radio Dual connectivity)/CA (Carrier Aggregation: carrier aggregation) enhanced work items. Either a dormant state (dormant) or a non-dormant state (non-dormant) is notified to a secondary cell or a group of secondary cells by DCI (Downlink control information: downlink information) during an active period of DRX (Discontinuous reception: discontinuous reception). In the secondary cell, which is notified of the sleep state, active BWP is switched to sleep BWP, for example, the terminal does not perform monitoring of PDCCH (Physical Downlink Control Channel) in the secondary cell.

Fig. 3 is a diagram for explaining an example of actions related to the sleep state. As described above, in NR, the secondary cell can be moved to the sleep state for the purpose of reducing power consumption.

As shown in fig. 3, during the active period of DRX, in the primary cell or primary-secondary cell group cell, either one of the "dormant state" or the "non-dormant state" is notified to the preset secondary cell group by the bitmap up to 5 bits, while scheduling is performed in the DCI format 0_1 or DCI format 1_1. That is, the base station 10 can notify the group of the secondary cells up to 5 groups, respectively, regarding the sleep state.

This notification can be performed by adding a bit field (0 bits to 5 bits) of the number of groups of secondary cells to the conventional DCI format 0_1 or DCI format 1_1. Fig. 3 shows an example of notification of transition from the "dormant state" to the "non-dormant state" for the group "dormant#0" of secondary cells including scell#1 and scell#2.

As shown in fig. 3, during the active period of DRX, either the "dormant state" or the "non-dormant state" may be notified to the secondary cell by a bitmap up to 15 bits, instead of scheduling in the DCI format 1_1 in the primary cell or the primary-secondary cell group cell. That is, the base station 10 can notify the secondary cells up to 15 of the sleep state.

This notification may be performed by mapping the field "MCS (Modulation and coding scheme: modulation and coding scheme)" 5 bits, "NDI (New data indicator: new data indicator)" 1 bit, "RV (Redundancy version: redundancy version") 2 bits, "HARQ process number" 4 bits, "antenna port" 4 to 6 bits, "DMRS sequence initialization" 0 bit, 1 bit, or the like in the conventional DCI format 1_1 to an index of a secondary cell. In fig. 3, an example of a transition from "non-dormant state" to "dormant state" for SCell #1 notification and "non-dormant state" for SCell #2 notification is shown.

In addition, not scheduling in DCI format 1_1 may be that all bits of a field indicating resource allocation of a frequency domain are set to 0 or 1.

As shown in fig. 3, DCI formats 0_1 and 1_1 can be used for transition toward the sleep state during the active period of DRX. In addition, DCI format 2_6 can be utilized outside the active period of DRX.

As described above, the transition between the dormant state and the non-dormant state of the secondary cell can be performed by the DCI-based layer 1 signaling, but the transition between the active state and the non-active state cannot be performed by the DCI-based layer 1 signaling, and control of the MAC-CE by the layer 2 signaling is required.

Thus, activation of the secondary cell or deactivation of the secondary cell can be notified through DCI. For example, activation or deactivation of each secondary cell may be explicitly notified through a DCI field.

Fig. 4 is a timing chart for explaining an example of actions related to state transition of a cell in the embodiment of the present invention. In step S1, the base station 10 transmits DCI, which is layer 1 signaling, to the terminal 20. In the next step S2, the terminal 20 activates or deactivates the target secondary cell according to the received DCI.

Fig. 5 is a diagram showing an example (1) of control information in the embodiment of the present invention. As shown in fig. 5, for example, a bitmap informing activation or deactivation of the secondary cell #0 to the secondary cell #4 may be included in the DCI field. For example, in a bitmap, a "1" may be used to indicate activation and a "0" may be used to indicate deactivation. Fig. 5 shows an example in which the secondary cell #0 is deactivated and moved to the inactive state, the secondary cell #1 is activated and moved to the active state, the secondary cell #2 is activated and moved to the active state, the secondary cell #3 is deactivated and moved to the inactive state, and the secondary cell #4 is deactivated and moved to the inactive state. The terminal 20 may assume the size of the DCI field corresponding to the bitmap according to the set number of secondary cells.

In addition, DCI notifying activation or deactivation of a secondary cell may be notified only in a CC specified or set. For example, the DCI notifying activation or deactivation of the secondary cell can be notified only in the primary cell or the primary-secondary cell group cell.

Fig. 6 is a diagram showing an example (2) of control information in the embodiment of the present invention. As shown in fig. 6, for example, a bitmap informing 0 in the case of activation or deactivation of the secondary cell group #0 to the secondary cell group #4 may be included in the DCI field. For example, in a bitmap, a "1" may be used to indicate activation and a "0" may be used to indicate deactivation. Fig. 6 is an example in which the secondary cell group #0 is deactivated and moved to the inactive state, the secondary cell group #1 is activated and moved to the active state, the secondary cell group #2 is activated and moved to the active state, the secondary cell group #3 is deactivated and moved to the inactive state, and the secondary cell group #4 is deactivated and moved to the inactive state. The terminal 20 may assume the size of the DCI field corresponding to the bitmap according to the number of the set secondary cell groups.

Further, DCI notifying activation or deactivation of the secondary cell group may be notified only in a predetermined or set CC. For example, the DCI may be notified only in the primary cell or the primary and secondary cell group cell to notify activation or deactivation of the secondary cell.

In addition, regarding the secondary cell group configuration, the secondary cell group configuration may be notified to the terminal 20 in advance by RRC signaling or the like, or the secondary cell group used for notification of the sleep BWP (Dormant BWP) may be utilized.

Further, the base station 10 may explicitly notify the terminal 20 of activation/deactivation per secondary cell or per secondary cell group using a secondary cell sleep notification (SCell dormancy indication) field in DCI.

For example, information (e.g., 1 bit) indicating whether the secondary cell sleep notification field is sleep state/non-sleep state oriented or active state/inactive state oriented notification may be notified through other fields of the same DCI. The other field may be a new field, or may be an existing field based on a residual code point (code point) or a condition. In addition, the name of the "secondary cell dormancy notification field" may be another name.

As other examples, the base station 10 may notify the terminal 20 of any one of three states of an active state, an inactive state, and a dormant state through a secondary cell dormant notification field in DCI. The existing secondary cell sleep notification field bit or bit interpretation may be changed to notify the three states.

As another example, the terminal 20 may transition a secondary cell in an inactive state to an active state among target secondary cells when the non-sleep state is notified through a secondary cell sleep notification field in DCI. That is, the secondary cell dormancy notification field may be interpreted as a notification indicating activation.

As another example, the terminal 20 may transition a secondary cell, which is already in a dormant state, to an inactive state among target secondary cells when the dormant state is notified through a secondary cell dormant notification field in DCI. That is, the secondary cell dormancy notification field may be interpreted as a notification indicating deactivation.

Fig. 7 is a flowchart for explaining an example (1) of state transition of a cell in the embodiment of the present invention. Deactivation may be explicitly notified to a secondary cell corresponding to a scheduling destination of the DCI through a DCI field.

In step S11, the terminal 20 receives DCI from the base station 10. In the next step S12, the terminal 20 may deactivate a secondary cell corresponding to the scheduling destination of the DCI.

In the case where the DCI in step S11 is the same carrier scheduling (Same carrier scheduling), the terminal 20 may interpret that deactivation for the secondary cell itself that received the DCI (PDCCH) is notified.

In the case where the DCI of step S11 is cross-carrier scheduling (Cross carrier scheduling), the terminal 20 may interpret that deactivation for the secondary cell set as the scheduling destination of the DCI (PDCCH) is notified.

The DCI field for explicitly notifying the secondary cell corresponding to the DCI scheduling destination described above of deactivation may be a new field or may be an existing field (including a secondary cell dormancy notification field) based on a remaining code point, a condition, or the like.

As described above, when deactivation is instructed to a small number of the set large number of secondary cells by explicitly notifying the secondary cells corresponding to the scheduling destination of DCI, the deactivation can be notified with a smaller amount of data than the notification based on the bitmap corresponding to the plurality of secondary cells.

Fig. 8 is a flowchart for explaining an example (2) of state transition of a cell in the embodiment of the present invention. Only secondary cells satisfying a certain condition may be activated/deactivated according to the notification of the DCI.

In step S21, the terminal 20 receives DCI from the base station 10. In the next step S22, the terminal 20 may activate or deactivate the secondary cell satisfying the condition.

The DCI in step S21 may contain a field representing an indication of deactivation. As a condition in step S22, for example, the terminal 20 may deactivate all secondary cells or secondary cells of the notified/specified secondary cells for which the activated BWP corresponds to the dormant BWP at the time of receiving the DCI in step S21.

The field indicating the deactivation instruction may be a common field (e.g., 1 bit) for all the secondary cells, or may be a common field (e.g., 1 bit) for each secondary cell group. As for this secondary cell group structure, the terminal 20 may be notified of the secondary cell group in advance by RRC signaling or the like, or a secondary cell group used for notification of dormant BWP may be used. That is, only secondary cells satisfying the condition among the secondary cell groups that make the common instruction can make state transitions.

The field indicating the deactivation instruction may be a new field or an existing field (including a secondary cell dormancy notification field) based on the remaining code point, the condition, or the like.

In addition, the DCI in step S21 may contain a field indicating an indication of activation. As the condition in step S22, for example, the terminal 20 may activate, at the time of receiving the DCI in step S21, a secondary cell corresponding to the dormant BWP among all or the notified/prescribed secondary cells.

In addition, regarding whether or not the terminal 20 assumes a secondary cell activation/deactivation notification based on layer 1 (DCI), the terminal 20 may be notified through RRC setting. For example, the terminal 20 may perform layer 1 secondary cell activation/deactivation assuming a corresponding DCI field in a case where a secondary cell activation/deactivation notification based on layer 1 (DCI) is set according to RRC setting. For example, the terminal 20 may perform layer 1 secondary cell activation/deactivation assuming a corresponding DCI field when a secondary cell activation/deactivation notification based on layer 1 (DCI) is set according to RRC setting, or may perform a secondary cell activation/deactivation operation based on conventional MAC-CE or based on a timer. When a layer 1 (DCI) based secondary cell activation/deactivation notification is not set or stopped, a conventional MAC-CE based or timer based secondary cell activation/deactivation operation may be performed.

Further, the terminal 20 may be informed whether to reuse an existing field (including a secondary cell dormancy notification field) or to use a new field through RRC setting, and interpret DCI according to the notification.

In addition, a UE capability indicating whether or not layer 1 (DCI) based secondary cell activation/deactivation is supported may be specified, or the UE capability may be reported from the terminal 20 to the base station 10. The UE-capable terminal 20 may assume a corresponding DCI field for layer 1 activation/deactivation. The UE-capable terminal 20 may assume that the layer 1 activation/deactivation is performed by using a corresponding DCI field, and may perform a secondary cell activation/deactivation operation based on a conventional MAC-CE or a timer. The terminal 20 without the UE capability may perform a secondary cell activation/deactivation action based on a conventional MAC-CE or based on a timer.

In addition, a UE capability indicating whether an existing field (including the secondary cell dormancy notification field) is reusable or a new field is available may be specified, and the UE capability may be reported from the terminal 20 to the base station 10.

In the above embodiment, the notification or indication of activation/deactivation may be a notification of activation and deactivation of the respective corresponding bit fields (for example, 0 is deactivated and 1 is activated), a change from the current activation/deactivation state or a maintenance of the corresponding bit field (for example, 0 is maintenance, 1 is migration from activation to deactivation or from deactivation to activation), or a combination of these (for example, 0 is maintenance and 1 is activation).

In the above-described embodiments, actions related to notification of activation/deactivation may be combined. For example, the terminal 20 may transition to the dormant state when the dormant state is notified by the secondary cell dormant notification field in the DCI, and transition to the inactive state when the target secondary cell is in the active state. For example, the terminal 20 may transition to the active state when the target secondary cell is in the inactive state and also transition to the active state when the target secondary cell is in the dormant state when the target secondary cell is in the inactive state, by using the secondary cell dormant notification field in the DCI.

Through the above-described embodiments, the base station 10 can notify the terminal 20 of an activation/deactivation instruction according to layer 1 signaling, per secondary cell, per group of secondary cells, or individual secondary cells.

That is, in the wireless communication system, delay associated with state transition of the cell can be reduced.

(device Structure)

Next, a functional configuration example of the base station 10 and the terminal 20 that perform the above-described processing and operation will be described. The base station 10 and the terminal 20 contain functions to implement the above-described embodiments. However, the base station 10 and the terminal 20 may each have only some of the functions in the embodiments.

Base station 10 >, base station

Fig. 9 is a diagram showing an example of the functional configuration of the base station 10 in the embodiment of the present invention. As shown in fig. 9, the base station 10 includes a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in fig. 9 is merely an example. The names of the functional sections and the functional distinction may be arbitrary as long as the operations according to the embodiments of the present invention can be executed.

The transmitting unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. The transmitting unit 110 transmits an inter-network node message to another network node. The receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, higher-layer information from the received signals. The transmitting unit 110 also has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, and the like to the terminal 20. The receiving unit 120 receives an inter-network node message from another network node.

The setting unit 130 stores preset setting information and various setting information transmitted to the terminal 20. The content of the setting information is, for example, BWP setting of the terminal 20, setting of a power saving signal or power saving channel, setting related to activation, deactivation or dormancy of the secondary cell, and the like.

As described in the embodiment, the control section 140 performs control related to secondary cell, BWP, and power saving signal transmission. The transmitting unit 110 may include a function unit related to signal transmission in the control unit 140, and the receiving unit 120 may include a function unit related to signal reception in the control unit 140.

< terminal 20 >)

Fig. 10 is a diagram showing an example of the functional configuration of the terminal 20 according to the embodiment of the present invention. As shown in fig. 10, the terminal 20 includes a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in fig. 10 is merely an example. The names of the functional sections and the functional distinction may be arbitrary as long as the operations according to the embodiments of the present invention can be executed.

The transmitting unit 210 generates a transmission signal from the transmission data, and transmits the transmission signal wirelessly. The receiving unit 220 receives various signals wirelessly and acquires a higher layer signal from the received physical layer signal. The reception unit 220 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL/SL control signals, and the like transmitted from the base station 10. For example, the transmitter 210 transmits PSCCH (Physical Sidelink Control Channel: physical side link control channel), PSSCH (Physical Sidelink Shared Channel: physical side link shared channel), PSDCH (Physical Sidelink Discovery Channel: physical side link discovery channel), PSBCH (Physical Sidelink Broadcast Channel: physical side link broadcast channel) and the like to the other terminal 20 as D2D communication, and the receiver 220 receives PSCCH, PSSCH, PSDCH, PSBCH and the like from the other terminal 20.

The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220. The setting unit 230 also stores preset setting information. The content of the setting information is, for example, BWP setting of the terminal 20, setting of a power saving signal or power saving channel, setting related to activation, deactivation or dormancy of the secondary cell, and the like.

As described in the embodiment, the control unit 240 performs control related to the secondary cell, BWP, and power saving signal transmission. The transmitting unit 210 may include a function unit related to signal transmission in the control unit 240, and the receiving unit 220 may include a function unit related to signal reception in the control unit 240.

(hardware construction)

The block diagrams (fig. 9 and 10) used in the description of the above embodiment show blocks in units of functions. These functional blocks (structures) are realized by any combination of at least one of hardware and software. The implementation method of each functional block is not particularly limited. That is, each functional block may be realized by using one device physically or logically combined, or may be realized by directly or indirectly (for example, by using a wire, a wireless, or the like) connecting two or more devices physically or logically separated from each other, and using these plural devices. The functional blocks may also be implemented by combining software with the above-described device or devices.

Functionally, there are judgment, decision, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notification), communication (communication), forwarding (forwarding), configuration (reconfiguration), reconfiguration (allocating, mapping), assignment (assignment), and the like, but not limited thereto. For example, a functional block (configuration unit) that causes transmission to function is referred to as a transmitter (transmitting unit) or a transmitter (transmitter). In short, the implementation method is not particularly limited as described above.

For example, the base station 10, the terminal 20, and the like in one embodiment of the present disclosure may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig. 11 is a diagram showing an example of a hardware configuration of the base station 10 and the terminal 20 according to one embodiment of the present disclosure. The base station 10 and the terminal 20 may be configured as computer devices physically including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In addition, in the following description, the term "means" may be replaced with "circuit", "device", "unit", or the like. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude a part of the devices.

The functions in the base station 10 and the terminal 20 are realized by the following methods: predetermined software (program) is read into hardware such as the processor 1001 and the storage device 1002, and the processor 1001 performs an operation to control communication by the communication device 1004 or to control at least one of reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may be configured by a central processing unit (CPU: central Processing Unit) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the control unit 140, the control unit 240, and the like described above may be realized by the processor 1001.

Further, the processor 1001 reads out a program (program code), a software module, data, or the like from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes accordingly. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 140 of the base station 10 shown in fig. 9 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001. For example, the control unit 240 of the terminal 20 shown in fig. 10 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001. Although the above-described various processes are described as being executed by one processor 1001, the above-described various processes may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may also be mounted by more than one chip. In addition, the program may also be transmitted from the network via a telecommunication line.

The storage device 1002 is a computer-readable recording medium, and may be configured by at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM: erasable programmable ROM), an EEPROM (Electrically Erasable Programmable ROM: electrically erasable programmable ROM), a RAM (Random Access Memory: random access Memory), and the like, for example. The storage device 1002 may also be referred to as a register, a cache, a main memory (main storage device), or the like. The storage device 1002 can store a program (program code), a software module, or the like that can be executed to implement a communication method according to an embodiment of the present disclosure.

The auxiliary storage device 1003 is a computer-readable recording medium, and may be constituted by at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a Floppy disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk, a smart card, a flash memory (for example, a card, a stick, a Key drive (Key drive)), a Floppy (registered trademark) disk, a magnetic stripe, and the like).

The communication device 1004 is hardware (transceiver) for performing communication between computers via at least one of a wired network and a wireless network, and may be referred to as a network device, a network controller, a network card, a communication module, or the like, for example. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, for example, in order to realize at least one of frequency division duplexing (FDD: frequency Division Duplex) and time division duplexing (TDD: time Division Duplex). For example, a transmitting/receiving antenna, an amplifying unit, a transmitting/receiving unit, a transmission path interface, and the like may be realized by the communication device 1004. The transmitting/receiving unit may be physically or logically separately installed in the transmitting unit and the receiving unit.

The input device 1005 is an input apparatus (for example, a keyboard, a mouse, a microphone, a switch, a key, a sensor, or the like) that receives an input from the outside. The output device 1006 is an output apparatus (for example, a display, a speaker, an LED lamp, or the like) that performs output to the outside. The input device 1005 and the output device 1006 may be integrally formed (for example, a touch panel).

The processor 1001 and the storage device 1002 are connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using a different bus for each device.

The base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP: digital Signal Processor), an ASIC (Application Specific Integrated Circuit: application specific integrated circuit), a PLD (Programmable Logic Device: programmable logic device), an FPGA (Field Programmable Gate Array: field programmable gate array), or may be configured to implement a part or all of the functional blocks by the hardware. For example, the processor 1001 may also be installed using at least one of these hardware.

(summary of embodiments)

As described above, according to an embodiment of the present invention, there is provided a terminal having: a reception unit that receives control information, which is layer 1 signaling, from a base station, the control information including a field indicating activation or deactivation for one or more secondary cells; and a control unit that causes a specific secondary cell among the one or more secondary cells to transition to an active state or an inactive state, based on the control information.

With the above-described structure, the base station 10 can notify the terminal 20 of an instruction to activate/deactivate the secondary cell alone according to the layer 1 signaling. That is, in the wireless communication system, delay associated with state transition of the cell can be reduced.

The control unit may cause a secondary cell, which is a scheduling destination of the control information, among the one or more secondary cells to transition to an inactive state. With this structure, the terminal 20 can deactivate the secondary cell as the scheduling destination.

The control unit may cause a secondary cell of the one or more secondary cells, which has an active BWP (Bandwidth part) equivalent to the dormant BWP, to migrate to an inactive state. With this structure, the terminal 20 can deactivate the secondary cell as the scheduling destination.

The control unit may cause a secondary cell in an inactive state among the one or more secondary cells to migrate to an active state when the non-sleep state is notified through the field indicating the sleep state. With this structure, the terminal 20 can activate/deactivate the secondary cell according to the state of the secondary cell using a field indicating the sleep state.

The control unit may be configured to, when the sleep state is notified, transition a secondary cell in the sleep state from the one or more secondary cells to the inactive state. With this structure, the terminal 20 can activate/deactivate the secondary cell according to the state of the secondary cell using a field indicating the sleep state.

The receiving unit may receive an RRC (Radio resource control: radio resource control) setting indicating whether or not the field is assumed from the base station. With this structure, the terminal 20 can notify the base station 10 of the UE capability of "supporting activation/deactivation of the secondary cell based on layer 1 signaling" to perform activation/deactivation of the secondary cell based on layer 1 signaling.

The terminal may further have: and a transmitting unit configured to transmit, to the base station, a message indicating a terminal capability supporting activation or deactivation for the secondary cell based on the control information. With this structure, the terminal 20 can activate/deactivate the secondary cell according to the state of the secondary cell using a field indicating the sleep state.

Further, according to an embodiment of the present invention, there is provided a communication method in which a terminal performs the steps of: a reception step of receiving control information as layer 1 signaling, which includes a "field indicating activation or deactivation for one or more secondary cells" from a base station; and a control step of shifting a specific secondary cell among the one or more secondary cells to an active state or an inactive state according to the control information.

With the above-described configuration, the base station 10 can notify the terminal 20 of an instruction of activation/deactivation per secondary cell, per group of secondary cells, or individual secondary cells, according to layer 1 signaling. That is, in the wireless communication system, delay associated with state transition of the cell can be reduced.

(supplement of the embodiment)

While the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will appreciate various modifications, adaptations, alternatives, substitutions, and the like. Specific numerical examples are described for the purpose of promoting the understanding of the present invention, but these numerical values are merely examples unless otherwise indicated, and any appropriate values may be used. The distinction between items in the above description is not essential to the present invention, and items described in two or more items may be used in combination as required, or items described in one item may be applied to items described in other items (unless contradiction arises). The boundaries of functional units or processing units in the functional block diagrams do not necessarily correspond to the boundaries of physical components. The operations of the plurality of functional units may be physically performed by one member, or the operations of one functional unit may be physically performed by a plurality of members. With regard to the processing procedures described in the embodiments, the order of processing may be exchanged without contradiction. For ease of illustration, the base station 10 and terminal 20 are illustrated using functional block diagrams, but such means may also be implemented in hardware, in software, or in a combination thereof. The software operating by the processor provided by the base station 10 according to the embodiment of the present invention and the software operating by the processor provided by the terminal 20 according to the embodiment of the present invention may also be stored in Random Access Memory (RAM), flash memory, read Only Memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), a removable disk, a CD-ROM, a database, a server, and any other suitable storage medium, respectively.

Further, the notification of the information is not limited to the form/embodiment described in the present disclosure, and may be performed using other methods. For example, the notification of the information may be implemented by physical layer signaling (e.g., DCI (Downlink Control Information: downlink control information), UCI (Uplink Control Information: uplink control information)), higher layer signaling (e.g., RRC (Radio Resource Control: radio resource control) signaling, MAC (Medium Access Control: medium access control) signaling, broadcast information (MIB (Master Information Block: master information block), SIB (System Information Block: system information block)), other signals, or a combination thereof.

The various forms/embodiments described in the present disclosure may also be applied to at least one of LTE (Long Term Evolution: long term evolution), LTE-a (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4 th generation mobile communication system: fourth generation mobile communication system), 5G (5 th generation mobile communication system: fifth generation mobile communication system), FRA (Future Radio Access: future wireless access), NR (new Radio: new air interface), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, UMB (Ultra Mobile Broadband: ultra mobile broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-wide), bluetooth (registered trademark), systems using other suitable systems, and next generation systems extended accordingly. Further, a plurality of systems (for example, a combination of 5G and at least one of LTE and LTE-a) may be applied in combination.

The processing procedures, timings, flows, and the like of the respective modes/embodiments described in the present specification can be replaced without contradiction. For example, for the methods described in this disclosure, elements of the various steps are presented using an illustrated order, but are not limited to the particular order presented.

In the present specification, the specific operation performed by the base station 10 may be performed by an upper node (upper node) according to circumstances. In a network composed of one or more network nodes (network nodes) having a base station 10, it is apparent that various operations performed for communication with a terminal 20 may be performed by at least one of the base station 10 and other network nodes (for example, MME or S-GW, etc., but not limited thereto are considered) other than the base station 10. In the above, the case where one other network node other than the base station 10 is illustrated, but the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW).

Information, signals, and the like described in the present disclosure can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). Or may be input or output via a plurality of network nodes.

The input or output information and the like may be stored in a specific location (for example, a memory), or may be managed using a management table. Information input or output, etc. may be rewritten, updated, or recorded. The outputted information and the like may also be deleted. The input information and the like may also be transmitted to other devices.

The determination in the present disclosure may be performed by a value (0 or 1) represented by 1 bit, may be performed by a Boolean value (true or false), and may be performed by a comparison of numerical values (e.g., a comparison with a predetermined value).

With respect to software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, should be broadly interpreted to refer to a command, a set of commands, code, a code segment, program code, a program (program), a subroutine, a software module, an application, a software package, a routine, a subroutine, an object, an executable, a thread of execution, a procedure, a function, or the like.

In addition, software, commands, information, etc. may be transmitted and received via a transmission medium. For example, in the case where software is transmitted from a web page, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL: digital Subscriber Line), etc.) and a wireless technology (infrared, microwave, etc.), at least one of the wired and wireless technologies is included within the definition of transmission medium.

Information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, commands, instructions (commands), information, signals, bits, symbols, chips (chips), and the like may be referenced throughout the above description by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

Further, the terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and the symbol may be a signal (signaling). In addition, the signal may also be a message. In addition, the component carrier (CC: component Carrier) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

The terms "system" and "network" and the like as used in this disclosure may be used interchangeably.

In addition, information, parameters, and the like described in this disclosure may be expressed using absolute values, relative values to predetermined values, or other information corresponding thereto. For example, radio resources may also be indicated by an index.

The names used for the above parameters are non-limiting in any respect. Further, the numerical formulas and the like using these parameters may also differ from those explicitly shown in the present disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by appropriate names, and thus the various names assigned to these various channels and information elements are not limiting in any way.

In the present disclosure, terms such as "Base Station", "radio Base Station", "Base Station apparatus", "fixed Station", "NodeB", "eNodeB (eNB)", "gndeb (gNB)", "access point", "transmission point (transmission point)", "reception point", "transmission point", "reception point", "cell", "sector", "cell group", "carrier", "component carrier", and the like may be used interchangeably. A base station is also sometimes referred to as a macrocell, a microcell, a femtocell, a picocell, or the like.

The base station can accommodate one or more (e.g., three) cells. When a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each of the smaller areas can also provide communication services through a base station subsystem (for example, an indoor small base station (RRH: remote Radio Head (remote radio head)), and the term "cell" or "sector" refers to a part or the entire coverage area of at least one of a base station and a base station subsystem that performs communication services within the coverage area.

In the present disclosure, terms such as "Mobile Station", "User terminal", "User Equipment", and "terminal" may be used interchangeably.

For mobile stations, those skilled in the art are sometimes referred to by the following terms: a subscriber station, mobile unit (mobile unit), subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, or some other suitable terminology.

At least one of the base station and the mobile station may be referred to as a transmitting apparatus, a receiving apparatus, a communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The mobile body may be a vehicle (e.g., an automobile, an airplane, etc.), a mobile body that moves unmanned (e.g., an unmanned aerial vehicle, an autopilot, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station also includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things: internet of things) device of a sensor or the like.

In addition, the base station in the present disclosure may be replaced with a user terminal. For example, the various aspects and embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything system), etc.), in which case, the terminal 20 may have the functions of the base station 10 described above, and terms such as "uplink" and "downlink" may be replaced with terms (for example, "side") corresponding to communication between terminals.

Likewise, the user terminal in the present disclosure may be replaced with a base station. In this case, the base station may have the functions of the user terminal described above.

The terms "determining" and "determining" used in the present disclosure may include various operations. The terms "determine" and "determining" may include, for example, cases where "determination" and "determining" are regarded as matters of determining (determining), calculating (calculating), processing (processing), deriving (deriving), investigating (searching), searching (looking up, search, inquiry) (for example, searching in a table, a database or other data structure), and confirming (evaluating). Further, "determining" or "deciding" may include a matter of receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting (input), outputting (output), or accessing (e.g., accessing data in a memory) as a matter of "determining" or "deciding". Further, "judging" and "deciding" may include matters of solving (resolving), selecting (selecting), selecting (setting), establishing (establishing), comparing (comparing), and the like as matters of "judging" and "deciding". That is, the terms "determine" and "determining" may include terms that "determine" and "determine" any action. Further, "judgment (decision)" may be replaced with "assumption", "expectation", and "consider (confirm)".

The terms "connected," "coupled," or any variation of these terms are intended to refer to any direct or indirect connection or coupling between two or more elements, including the case where one or more intervening elements may be present between two elements that are "connected" or "coupled" to each other. The combination or connection of the elements may be physical, logical, or a combination of these. For example, "connection" may be replaced with "Access". As used in this disclosure, it is considered that for two elements, the interconnection or "bonding" is made by using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-inclusive examples, by using electromagnetic energy such as electromagnetic energy having wavelengths in the wireless frequency domain, the microwave region, and the optical (including both visible and invisible) regions.

The reference signal may be simply RS (Reference Signal) or may be called Pilot (Pilot) depending on the standard applied.

As used in this disclosure, the recitation of "according to" is not intended to mean "according to" unless explicitly recited otherwise. In other words, the term "according to" means "according to" and "according to" at least.

Any reference to elements using references such as "first," "second," etc. used in this disclosure, is not intended to limit the number or order of such elements in its entirety. These calls are referred to as simple ways of distinguishing between two or more elements and are used in this disclosure. Thus, references to first and second elements do not indicate that only two elements can be taken herein or that in any aspect the first element must precede the second element.

The "unit" in each device configuration described above may be replaced with "part", "circuit", "apparatus", or the like.

Where the terms "include", "comprising" and variations thereof are used in this disclosure, these terms are intended to be inclusive in the same sense as the term "comprising". Also, the term "or" as used in this disclosure means not exclusive or.

A radio frame may be comprised of one or more frames in the time domain. One or more of the frames in the time domain may also be referred to as subframes. A subframe may also be formed of one or more slots in the time domain. A subframe may be a fixed length of time (e.g., 1 ms) independent of a parameter set (numerology).

The parameter set may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The parameter set may represent, for example, at least one of a subcarrier spacing (SCS: subCarrier Spacing), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI: transmission Time Interval), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by the transceiver in the frequency domain, a specific windowing process performed by the transceiver in the time domain, and the like.

A slot may be formed in the time domain from one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing: orthogonal frequency division multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access: single carrier frequency division multiple access) symbols, etc.). A slot may be a unit of time based on a set of parameters.

The time slot may also contain a plurality of mini-slots. Each mini-slot may be formed of one or more symbols in the time domain. In addition, the mini-slot may also be referred to as a sub-slot. Mini-slots may also be made up of a fewer number of symbols than slots. PDSCH (or PUSCH) transmitted in a time unit larger than the mini-slot may also be referred to as PDSCH (or PUSCH) mapping type a. PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (or PUSCH) mapping type B.

The radio frame, subframe, slot, mini-slot, and symbol each represent a unit of time when a signal is transmitted. Other designations of radio frames, subframes, slots, mini-slots, and symbols, respectively, may also be used.

For example, 1 subframe may also be referred to as a transmission time interval (TTI: transmission Time Interval), a plurality of consecutive subframes may also be referred to as TTIs, and 1 slot or 1 mini slot may also be referred to as TTIs. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the conventional LTE, may be a period (e.g., 1-13 symbols) shorter than 1ms, or may be a period longer than 1 ms. The unit indicating the TTI may be called a slot, a mini-slot, or the like instead of a subframe.

Here, TTI refers to, for example, a scheduled minimum time unit in wireless communication. For example, in the LTE system, the base station performs scheduling for each terminal 20 to allocate radio resources (frequency domain width, transmission power, and the like that can be used in each terminal 20) in TTI units. Further, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a data packet (transport block), a code block, a codeword, or the like after channel coding, or may be a processing unit such as scheduling or link adaptation. When the TTI is provided, a time period (for example, the number of symbols) in which a transport block, a code block, a codeword, or the like is actually mapped may be shorter than the TTI.

In addition, in the case where 1 slot or 1 mini slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini slots) may also constitute a minimum time unit of scheduling. In addition, the number of slots (mini-slots) constituting the minimum time unit of the schedule may be controlled.

A TTI having a time length of 1ms may be referred to as a normal TTI (TTI in LTE rel.8-12), a normal TTI, a long TTI, a normal subframe, a long subframe, a slot, etc. A TTI that is shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, long TTIs (e.g., normal TTIs, subframes, etc.) can be replaced with TTIs having a time length exceeding 1ms, and short TTIs (e.g., shortened TTIs, etc.) can also be replaced with TTIs having a TTI length less than the long TTI and a TTI length greater than 1 ms.

A Resource Block (RB) is a resource allocation unit of a time domain and a frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the parameter set, and may be 12, for example. The number of subcarriers included in the RB may be determined based on the parameter set.

Further, the time domain of the RB may contain one or more symbols, and may be 1 slot, 1 mini slot, 1 subframe, or 1TTI in length. A 1TTI, a 1 subframe, etc. may also be each composed of one or more resource blocks.

In addition, one or more RBs may also be referred to as Physical resource blocks (PRB: physical RBs), subcarrier groups (SCG: sub-Carrier groups), resource element groups (REG: resource Element Group), PRB pairs, RB peering.

Furthermore, a Resource block may also be composed of one or more Resource Elements (REs). For example, 1RE may be a radio resource region of 1 subcarrier and 1 symbol.

A Bandwidth Part (BWP) may also be referred to as a partial Bandwidth Part, etc. in a certain carrier, and may also represent a subset of the contiguous common RB (common resource blocks) for a certain parameter set. Here, the common RB may also be determined by an index of RBs with respect to a common reference point of the carrier. PRBs may also be defined by a certain BWP and numbered within the BWP.

BWP may include UL BWP (UL BWP) and DL BWP (DL BWP). For a UE, one or more BWP may also be set within 1 carrier.

At least one of the set BWP may be active, and the UE may not contemplate transmitting and receiving a predetermined signal/channel other than the active BWP. Further, "cell", "carrier", etc. in the present disclosure may also be replaced with "BWP".

The above-described structure of the radio frame, subframe, slot, mini-slot, symbol, etc. is merely an example. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and the like can be variously changed.

In the present disclosure, for example, where an article is added by translation as in a, an, and the in english, the present disclosure also includes a case where a noun following the article is in plural.

In the present disclosure, the term "a and B are different" may also mean that "a and B are different from each other". The term "a and B are different from C" may also be used. The terms "separate," coupled, "and the like may also be similarly construed as" different.

The embodiments described in the present disclosure may be used alone, in combination, or switched according to execution. Note that the notification of the predetermined information is not limited to being performed explicitly (for example, notification of "yes" or "X"), and may be performed implicitly (for example, notification of the predetermined information is not performed).

In addition, in the present disclosure, DCI is an example of control information.

The present disclosure has been described in detail above, but it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Accordingly, the description of the present disclosure is intended to be illustrative, and not in any limiting sense.

Description of the reference numerals:

10. base station

110. Transmitting unit

120. Receiving part

130. Setting part

140. Control unit

20. Terminal

210. Transmitting unit

220. Receiving part

230. Setting part

240. Control unit

1001. Processor and method for controlling the same

1002. Storage device

1003. Auxiliary storage device

1004. Communication device

1005. Input device

1006. Output device

Claims (8)

1. A terminal, wherein the terminal has:

a receiving unit that receives control information, which is layer 1 signaling, from a base station, the control information including a field indicating activation or deactivation for one or more secondary cells; and

and a control unit that, based on the control information, causes a specific secondary cell among the one or more secondary cells to transition to an active state or an inactive state.

2. The terminal of claim 1, wherein,

the control unit transitions a secondary cell, which is a scheduling destination of the control information, among the one or more secondary cells to an inactive state.

3. The terminal of claim 1, wherein,

the control unit causes a secondary cell, of the one or more secondary cells, whose active bandwidth portion, i.e., active BWP, corresponds to dormant BWP, to migrate to an inactive state.

4. The terminal of claim 1, wherein,

the control unit causes a secondary cell in an inactive state to migrate to an active state, among the one or more secondary cells, when the non-sleep state is notified through the field indicating the sleep state.

5. The terminal of claim 1, wherein,

the control unit, when notified of the sleep state, causes a secondary cell in the sleep state to transition to an inactive state among the one or more secondary cells.

6. The terminal of claim 1, wherein,

the reception unit receives RRC settings indicating whether or not the radio resource control settings of the field are assumed from the base station.

7. The terminal of claim 1, wherein the terminal further has:

And a transmitting unit configured to transmit, to the base station, a terminal capability indicating "support activation or deactivation of the secondary cell by the control information".

8. A communication method, wherein the communication method is performed by a terminal as follows:

a reception step of receiving, from a base station, control information as layer 1 signaling, the control information including a field indicating activation or deactivation for one or more secondary cells; and

and a control step of shifting a specific secondary cell of the one or more secondary cells to an active state or an inactive state according to the control information.

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