Terminal, communication method, base station, and communication system

Abstract

This terminal comprises: a reception unit which receives, from a base station, trigger notification of a temporary reference signal (RS) and an instruction for activating or deactivating a secondary cell by means of a single medium access control - control element (MAC-CE); a control unit which when the instruction is for activating the secondary cell, executes, on the basis of the trigger notification, synchronization and measurement in the secondary cell by using the temporary RS; and a transmission unit which transmits, to the base station, a channel state information (CSI) report based on the measurement result for the temporary RS.

Description

Technical Field

[0001] The present invention relates to Terminal, communication method, base station, and communication system ...

Background Art

[0002] In 3GPP (3rd Generation Partnership Project), in order to achieve further increase in system capacity, further increase in data transmission speed, further reduction in latency in the radio section, etc., a radio communication method called 5G or NR (New Radio) (hereinafter, this radio communication method is referred to as "NR") is being studied. In 5G, in order to meet the requirement of achieving a throughput of 10 Gbps or more and reducing the latency in the radio section to 1 ms or less, various radio technologies and network architectures are being studied (for example, Non-Patent Document 1).

[0003] Also, in NR, the enhancement of MR-DC (Multi RAT - Dual Connectivity) is being studied. For example, the efficiency of activation / de-activation of the secondary cell group and the secondary cell is being studied.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Non-Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] When activating a secondary cell, it is necessary to receive one or more SSBs (SS / PBCH blocks). Therefore, depending on the period of the SSB, the delay related to the activation of the secondary cell may increase. In order to shorten such a delay, when activating a secondary cell, triggering a temporary RS (Reference Signal) has been considered. However, a specific method for triggering the temporary RS has not been defined.

[0006] The present invention has been made in view of the above points, and an object thereof is to shorten the delay related to the activation of a secondary cell in a wireless communication system.

Means for Solving the Problems

[0007] According to the disclosed technology, A terminal having a receiving unit that receives, from a base station, an instruction to activate or deactivate a secondary cell and a trigger notification for a TRS (Tracking RS) by a single MAC-CE (Medium Access Control - Control Element), and a control unit that, when the instruction is an instruction to activate the secondary cell, activates the secondary cell using a TRS corresponding to a TRS setting ID included in the trigger notification, wherein the receiving unit receives, from the base station by RRC (Radio Resource Control) signaling, a trigger offset, information related to QCL (Quasi co located), and a transmission count associated with the TRS setting ID, and the control unit applies the trigger offset, the information related to QCL, and the transmission count to reception of the TRS is provided.

Effects of the Invention

[0008] According to the disclosed technology, a technology for shortening the delay related to the activation of a secondary cell in a wireless communication system is provided.

Brief Description of the Drawings

[0009]

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MODE FOR CARRYING OUT THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

[0011] In the operation of the wireless communication system according to the embodiment of the present invention, existing technologies are appropriately used. However, the existing technology is, for example, existing LTE, but is not limited to existing LTE. Further, the term "LTE" used in this specification shall have a broad meaning including LTE-Advanced and subsequent systems (e.g., NR) unless otherwise specified.

[0012] In addition, in the embodiments of the present invention described below, terms such as SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), and PUSCH (Physical Uplink Shared Channel) that are used in existing LTE are used. This is for the convenience of description, and signals, functions, etc. similar to these may be called by other names. Also, the above-mentioned terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even for signals used in NR, the "NR-" is not necessarily specified.

[0013] In addition, in the embodiments of the present invention, the duplex mode may be a TDD (Time Division Duplex) mode, an FDD (Frequency Division Duplex) mode, or another mode (e.g., Flexible Duplex, etc.).

[0014] In addition, in the embodiments of the present invention, that a radio parameter or the like is "configured" may mean that a predetermined value is pre-configured, or that a radio parameter notified from the base station 10 or the terminal 20 is configured.

[0015] FIG. 1 is a diagram for explaining a wireless communication system in the embodiments of the present invention. As shown in FIG. 1, the wireless communication system in the embodiments of the present invention includes a base station 10 and a terminal 20. In FIG. 1, one base station 10 and one terminal 20 are shown, but this is an example, and there may be a plurality of each.

[0016] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of the wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. Also, the TTI (Transmission Time Interval) in the time domain may be a slot or a sub-slot, or the TTI may be a sub-frame.

[0017] The base station 10 is capable of performing carrier aggregation in which a plurality of cells (a plurality of CCs (Component Carriers)) are bundled to communicate with the terminal 20. In carrier aggregation, one primary cell (PCell, Primary Cell) and one or more secondary cells (SCell, Secondary Cell) are used.

[0018] The base station 10 transmits synchronization signals and system information, etc. to the terminal 20. The synchronization signals are, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, by NR-PBCH or PDSCH, and is also referred to as broadcast information. As shown in FIG. 1, the base station 10 transmits control signals or data to the terminal 20 in the DL (Downlink) and receives control signals or data from the terminal 20 in the UL (Uplink). Here, what is transmitted on control channels such as PUCCH and PDCCH is called a control signal, and what is transmitted on shared channels such as PUSCH and PDSCH is called data, but such a naming method is an example.

[0019] The terminal 20 is a communication device having a wireless communication function such as a smartphone, a mobile phone, a tablet, a wearable terminal, a communication module for M2M (Machine-to-Machine), etc. As shown in FIG. 1, the terminal 20 receives a control signal or data from the base station 10 in DL and transmits a control signal or data to the base station 10 in UL, thereby using various communication services provided by the wireless communication system. Note that the terminal 20 may be referred to as a UE, and the base station 10 may be referred to as a gNB.

[0020] The terminal 20 is capable of performing carrier aggregation in which a plurality of cells (a plurality of CCs) are bundled to communicate with the base station 10. In carrier aggregation, one primary cell and one or more secondary cells are used. Also, a PUCCH-SCell having a PUCCH may be used.

[0021] Also, in NR, enhancement of MR-DC (Multi RAT - Dual Connectivity) is being considered. For example, efficiency improvement of activation / de-activation of a secondary cell group and a secondary cell is being considered.

[0022] The terminal 20 is capable of deactivating a secondary cell during CA operation. When the secondary cell is in an inactive state, since PDCCH monitoring etc. is not performed in the secondary cell, power consumption can be reduced.

[0023] When activating a secondary cell from an inactive state and transitioning it to an active state, a secondary cell activation delay is required. FIG. 2 is a diagram showing an example of activating a secondary cell. Note that the example shown in FIG. 2 is just an example, and different secondary cell activation delays are assumed depending on conditions such as whether the secondary cell is a known cell or not, and the embodiments of the present invention may be applied to any secondary cell activation delay.

[0024] When the activation command of the secondary cell is received in slot n, for the activated secondary cell, the operations in the active state (e.g., transmission of CSI reports) are resumed until slot n + T HARQ +T activaion_time +T CSI_Reporting up to.

[0025] As shown in Figure 2, T HARQ is the time from the DL transmission (including the MAC-CE of the activation command of the secondary cell) until the terminal 20 transmits an ACK. As shown in Figure 2, T activaion_time is 3 ms (UE processing time of the MAC-CE and RF warm-up / retuning time) + T FirstSSB (time to the first SSB resource after the set time above) + 2 ms (SSB processing time). The setting time of AGC (Auto Gain Control), etc. is also included in T activaion_time T CSI_Reporting includes the time to the CSI measurement resource, the UE processing time for CSI measurement and reporting, and the time to the CSI reporting resource.

[0026] As described above, when activating the secondary cell, since it is necessary to receive one or more SSBs, the secondary cell activation delay increases according to the SSB period.

[0027] To improve the activation efficiency of secondary cells, one or more MAC - CE (Medium Access Control - Control Element) included in a single PDSCH may be able to perform both the activation of secondary cells and the triggering of a temporary RS for activating secondary cells. FIG. 3 is a diagram showing an example of activating a secondary cell in an embodiment of the present invention. As shown in FIG. 3, it has been considered to trigger a temporary RS by 1 MAC - CE and use the temporary RS instead of SSB to shorten the secondary cell activation delay. Note that, for example, TRS (Tracking RS) is considered to be used as the temporary RS.

[0028] FIG. 4 is a diagram showing an example (1) of a MAC - CE for activating a secondary cell. FIG. 5 is a diagram showing an example (2) of a MAC - CE for activating a secondary cell. In existing NR, notifications of activation or de - activation are made for a plurality of secondary cells by a MAC - CE as shown in FIGS. 4 and 5. In FIG. 4, notifications can be made for up to 7 secondary cells, and in FIG. 5, notifications can be made for up to 31 secondary cells. If C X is 1, it indicates activating the secondary cell with the secondary cell index X, and if C X is 0, it indicates de - activating the secondary cell with the secondary cell index X. Note that R may be a reserved bit.

[0029] However, a specific method for triggering the activation or de - activation of secondary cells and a temporary RS by a MAC - CE has not been defined.

[0030] Therefore, in 1 MAC - CE, it may be possible to notify a plurality of secondary cells of the activation of secondary cells and the triggering of a temporary RS.

[0031] FIG. 6 is a diagram showing an example (1) of a MAC-CE for activating a secondary cell in an embodiment of the present invention. As shown in FIG. 6, C X is a notification of activation or deactivation for the secondary cell of the secondary cell index X, and T X is a trigger notification of the temporary RS for the secondary cell of the secondary cell index X. C X and T X may each indicate that 1 is active or valid and 0 is deactivated or invalid.

[0032] In the example shown in FIG. 6, as the trigger notification T X of the temporary RS, a 1-bit notification is made for each CC. For example, it may be notified whether to trigger the temporary RS with 1 bit. That is, it may be notified whether to execute secondary cell activation assuming that the terminal 20 uses the temporary RS.

[0033] Also, information related to the trigger of the temporary RS may be notified as the trigger notification T X of the temporary RS in the MAC-CE. That is, T X may be 2 bits or more. Also, information related to the trigger of the temporary RS may be notified in advance by RRC signaling or the like.

[0034] The information related to the trigger of the temporary RS may include one or more of the information shown in the following 1)-7).

[0035] 1) Setting ID (for example, trigger state ID, temporary RS setting ID, etc. The setting information for each ID may be set in advance by RRC signaling or the like.) 2) Trigger offset (time resource position of the temporary RS) 3) Frequency resource position of the temporary RS 4) BWP (Bandwidth part) index 5) Secondary cell index or secondary cell group index 6) Information related to QCL (Quasi co located) 7) Number of transmissions of Temporary RS

[0036] Trigger notification T of Temporary RS X may include information only for the secondary cell for which activation of the secondary cell is instructed. For example, when a deactivation instruction is given to C1, T1 may not be included in the MAC-CE.

[0037] Or, the trigger notification T of Temporary RS X may include information for all secondary cells. When T X includes information for all secondary cells, the terminal 20 may ignore the trigger notification T of Temporary RS for the secondary cell for which a deactivation instruction has been given. X

[0038] Note that the secondary cell index X may be an index for a single secondary cell or an index for a secondary cell group, and the secondary cell group may be pre-set.

[0039] Also, in one MAC-CE, it may be possible to notify activation of the secondary cell and trigger of Temporary RS for the specified secondary cell or secondary cell group.

[0040] FIG. 7 is a diagram showing an example (2) of a MAC-CE for activating a secondary cell in an embodiment of the present invention. As shown in FIG. 7, C is a notification of activation or deactivation for the secondary cell specified by the secondary cell index, and T is a trigger notification of Temporary RS for the secondary cell specified by the secondary cell index. Either C or T may indicate 1 for active or valid and 0 for deactive or invalid.

[0041] ​In the example shown in FIG. 7, as a trigger notification T of the temporary RS, a 1-bit notification is performed for each CC. For example, whether or not to trigger the temporary RS with 1 bit may be notified. That is, whether or not to execute secondary cell activation assuming that the terminal 20 uses the temporary RS may be notified.

[0042] Also, information related to the trigger of the temporary RS may be notified as the trigger notification T of the MAC-CE for the temporary RS X That is, T may be 2 bits or more. Also, information related to the trigger of the temporary RS may be notified in advance by RRC signaling or the like.

[0043] The information related to the trigger of the temporary RS may include one or more of the information shown in the following 1)-7).

[0044] 1) Setting ID (for example, trigger state ID, temporary RS setting ID, etc. The setting information for each ID may be set in advance by RRC signaling or the like.) 2) Trigger offset (time resource position of the temporary RS) 3) Frequency resource position of the temporary RS 4) BWP (Bandwidth part) index 5) Secondary cell index or secondary cell group index 6) Information related to QCL (Quasi co located) 7) Transmission count of the temporary RS

[0045] The notification C of the activation or deactivation of the secondary cell may or may not be included in the MAC-CE. When C is not included in the MAC-CE, when this MAC-CE is notified, it may be assumed that the secondary cell corresponding to the specified secondary cell index is activated.

[0046] Note that the secondary cell index may be an index for a single secondary cell or an index for a secondary cell group, and the secondary cell group may be pre-configured.

[0047] Also, in 1 MAC-CE, it may be possible to notify a trigger of temporary RS for a plurality of secondary cells.

[0048] FIG. 8 is a diagram showing an example (3) of MAC-CE for activating a secondary cell in an embodiment of the present invention. As shown in FIG. 8, T X is a trigger notification of temporary RS for the secondary cell of secondary cell index X. T X may indicate that 1 is active or valid, and 0 is deactivated or invalid.

[0049] In the example shown in FIG. 8, as the trigger notification T X of temporary RS, a 1-bit notification is performed for each CC. For example, it may be notified whether or not to trigger the temporary RS with 1 bit. That is, it may be notified whether or not to execute secondary cell activation assuming that the terminal 20 uses the temporary RS.

[0050] Also, information related to the trigger of the temporary RS may be notified as the trigger notification T X of the temporary RS of MAC-CE. That is, T X may be 2 bits or more. Also, information related to the trigger of the temporary RS may be notified in advance by RRC signaling or the like.

[0051] The information related to the trigger of the temporary RS may include one or more of the information shown in the following 1)-7).

[0052] 1) Configuration ID (for example, trigger state ID, temporary RS configuration ID, etc. The configuration information for each ID may be pre-configured by RRC signaling or the like.) 2) Trigger offset (temporal RS time resource position) 3) Temporal RS frequency resource position 4) BWP (Bandwidth part) index 5) Secondary cell index or secondary cell group index 6) Information related to QCL (Quasi co located) 7) Transmission times of the temporal RS

[0053] Note that the secondary cell index X may be an index for a single secondary cell or an index for a secondary cell group, and the secondary cell group may be pre-configured.

[0054] Also, the MAC-CE for notifying the activation or deactivation of the secondary cell may be included in the PDSCH including the MAC-CE shown in FIG. 8. The trigger notification T of the temporal RS X may include information only for the secondary cell for which the activation of the secondary cell is indicated. For example, if a deactivation instruction is given for secondary cell index 1, T1 may not be included in the MAC-CE. Or, the trigger notification T of the temporal RS X may include information for all secondary cells. T X may include information for all secondary cells. T X When T includes information for all secondary cells, the terminal 20 may ignore the trigger notification T of the temporal RS for the secondary cell for which the deactivation instruction is given. Also, for the secondary cell notified that the temporal RS is triggered by the trigger notification T of this MAC-CE X it may be assumed that the activation of the secondary cell is indicated. X

[0055] ​Also, in the 1MAC-CE, it may be possible to notify the trigger of the temporary RS for all secondary cells or the secondary cells for which activation is instructed.

[0056] FIG. 9 is a diagram showing an example (4) of the MAC-CE for activating a secondary cell in an embodiment of the present invention. FIG. 10 is a diagram showing an example (5) of the MAC-CE for activating a secondary cell in an embodiment of the present invention. As shown in FIG. 9, C X is a notification of activation or deactivation for the secondary cell of the secondary cell index X. As shown in FIGS. 9 and 10, T is a trigger notification of the temporary RS. C X Both C and T may indicate 1 for activation or valid and 0 for deactivation or invalid. FIG. 10 is an example in which T is notified by a MAC-CE different from the notification of activation or deactivation of the secondary cell.

[0057] The trigger notification of the temporary RS shown in FIGS. 9 and 10 is notified without distinguishing secondary cells. Information related to the trigger of the temporary RS may be notified for each secondary cell in advance by RRC signaling or the like.

[0058] In the example shown in FIG. 9, as the trigger notification T of the temporary RS, a 1-bit notification is made. For example, it may be notified whether or not to trigger the temporary RS with 1 bit. That is, it may be notified whether or not to execute secondary cell activation assuming that the terminal 20 uses the temporary RS.

[0059] Also, information related to the trigger of the temporary RS may be notified as the trigger notification T of the temporary RS of the MAC-CE. That is, T may be 2 bits or more. Although T is shown as 1 bit in FIG. 9 and T is shown as 8 bits in FIG. 10, they may be different bits. Also, information related to the trigger of the temporary RS may be notified in advance by RRC signaling or the like.

[0060] The information related to the trigger of the temporary RS may include one or more of the information shown in the following 1)-8).

[0061] 1) Setting ID (for example, trigger state ID, temporary RS setting ID, etc. The setting information for each ID may be set in advance by RRC signaling or the like.) 2) Trigger offset (time resource position of the temporary RS) 3) Frequency resource position of the temporary RS 4) BWP (Bandwidth part) index 5) Secondary cell index or secondary cell group index 6) Information related to QCL (Quasi co located) 7) Transmission times of the temporary RS 8) Information indicating whether to trigger the temporary RS for each secondary cell (or each secondary cell group)

[0062] Note that the secondary cell index X may be an index for a single secondary cell or an index for a secondary cell group, and the secondary cell group may be set in advance.

[0063] Note that when the notification of the information related to the trigger of the temporary RS shown in FIG. 9 or FIG. 10 is executed by MAC-CE, it may be assumed as the information related to the common trigger of the temporary RS for all secondary cells or all secondary cells activated within the same MAC-CE (or within the same PDSCH).

[0064] When the notification of the information related to the trigger of the temporary RS is notified in advance by RRC signaling or the like, different information related to the trigger of the temporary RS may be notified in advance for each secondary cell or secondary cell group.

[0065] For example, when it is notified that the temporary RS is triggered by T of the MAC-CE, assuming that the temporary RS is triggered for all secondary cells or all secondary cells for which activation is instructed within the same MAC-CE (or within the MAC-CE included in the same PDSCH), the activation of the secondary cells may be executed using the temporary RS.

[0066] Alternatively, one or more secondary cells for which the temporary RS is available may be set in advance by RRC signaling or the like. For the set secondary cells, the activation of the secondary cells using the temporary RS may be performed, and for the secondary cells that are not set, the activation of the secondary cells may be performed without using the temporary RS.

[0067] When the trigger offset of the temporary RS is notified by T of the MAC-CE, for all secondary cells or all secondary cells for which activation instructions are given within the same MAC-CE (or within the MAC-CE included in the same PDSCH), the activation of the secondary cells using the temporary RS may be performed using the same trigger offset value.

[0068] Also, the value of the trigger offset to be used when the temporary RS is triggered may be set in advance by RRC signaling or the like for each secondary cell or secondary cell group. Based on the set value, when the temporary RS is triggered, the activation of the secondary cells using the temporary RS may be performed using different trigger offset values for each secondary cell.

[0069] When the notification of the information related to the trigger of the temporary RS shown in FIG. 9 or FIG. 10 is executed by the MAC-CE, it may be assumed as the index of the information related to the trigger of the common temporary RS for all the secondary cells or all the secondary cells activated within the same MAC-CE (or within the same PDSCH). For example, the index may be common among the secondary cells and the actually applied value may be different among the secondary cells.

[0070] For each such index, which value to use in each secondary cell may be set in advance by RRC signaling or the like. For example, the value of the trigger offset to be used when the temporary RS is triggered for each secondary cell or secondary cell group and the corresponding index may be set in advance by RRC signaling or the like. When the temporary RS is triggered, a common index (for example, index #1) is notified by the MAC-CE, and the activation of the secondary cell using the temporary RS may be performed using the value of the trigger offset corresponding to the index (for example, index #1) specified for each secondary cell. That is, it may be possible to use different trigger offset values among the secondary cells.

[0071] When the secondary cell index is notified by the MAC-CE shown in FIG. 7, the same operation as when the MAC-CE shown in FIG. 9 or FIG. 10 is notified may be executed when the secondary cell index is not notified or when the secondary cell index is a specific value.

[0072] FIG. 11 is a sequence diagram for explaining an example of activating a secondary cell in an embodiment of the present invention. In step S1, the base station 10 transmits a notification by MAC-CE to the terminal 20. The MAC-CE may be the MAC-CE shown in FIGS. 6 to 10. In the subsequent step S2, the terminal 20 transmits an ACK to the base station 10. In the subsequent step S3, the terminal 20 receives a temporary RS from the base station 10. The terminal 20 may perform synchronization and / or measurement using the temporary RS. In the subsequent step S4, the terminal 20 transmits a CSI report to the base station 10 based on the measurement result of the temporary RS. In the subsequent step S5, the terminal 20 executes activation of the secondary cell.

[0073] According to the above-described embodiment, when activating the secondary cell, the terminal 20 can receive a MAC-CE including information related to the trigger of the temporary RS, and use the temporary RS instead of the SSB, thereby shortening the secondary cell activation delay.

[0074] That is, in a wireless communication system, the delay related to the activation of the secondary cell can be shortened.

[0075] (Device Configuration) Next, a functional configuration example of the base station 10 and the terminal 20 that execute the processes and operations described so far will be described. The base station 10 and the terminal 20 include functions for executing the above-described embodiment. However, the base station 10 and the terminal 20 may each include only any one of the functions of the embodiment.

[0076] <Base Station 10> FIG. 12 is a diagram showing an example of the functional configuration of the base station 10. As shown in FIG. 12, the base station 10 includes a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in FIG. 12 is merely an example. As long as the operations according to the embodiments of the present invention can be executed, the functional division and the names of the functional units may be any. The transmission unit 110 and the reception unit 120 may be called a communication unit.

[0077] The transmitting unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and wirelessly transmitting the signal. The receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and obtaining information of a higher layer, for example, from the received signals. Also, the transmitting unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20. Further, the transmitting unit 110 transmits the setting information and the like described in the embodiments.

[0078] The setting unit 130 stores setting information set in advance and various setting information to be transmitted to the terminal 20 in a storage device, and reads it out from the storage device as necessary. The control unit 140 performs, for example, resource allocation, control of the entire base station 10, etc. Note that a functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and a functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120. Also, the transmitting unit 110 and the receiving unit 120 may be called a transmitter and a receiver, respectively.

[0079] <Terminal 20> FIG. 13 is a diagram showing an example of the functional configuration of the terminal 20. As shown in FIG. 13, 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. 13 is merely an example. As long as the operations according to the embodiments of the present invention can be executed, the functional division and the names of the functional units may be any. The transmitting unit 210 and the receiving unit 220 may be called a communication unit.

[0080] The transmitting unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The receiving unit 220 wirelessly receives various signals and obtains a signal of a higher layer from the received physical layer signal. Also, the transmitting unit 210 transmits HARQ-ACK, and the receiving unit 220 receives the setting information and the like described in the embodiments.

[0081] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 in the storage device, and reads it out from the storage device as needed. Further, the setting unit 230 also stores preset setting information. The control unit 240 controls the entire terminal 20. Note that the functional unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and the functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220. Also, the transmission unit 210 and the receiving unit 220 may be referred to as a transmitter and a receiver, respectively.

[0082] (Hardware Configuration) The block diagrams (FIGS. 12 and 13) used in the description of the above embodiment show blocks of functional units. These functional blocks (constituent parts) are realized by any combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (for example, using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0083] Functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, regarded as, notification (broadcasting), notification (notifying), communication (communicating), forwarding, configuration (configuring), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment (assigning), etc. For example, a functional block (constituent part) that functions as transmission is called a transmission unit or a transmitter. In any case, as described above, the realization method is not particularly limited.

[0084] For example, the base station 10, the terminal 20, etc. in an embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 14 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. Physically, the above-described base station 10 and terminal 20 may be configured as a computer device 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.

[0085] In the following description, the term "device" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0086] Each function in the base station 10 and the terminal 20 is realized by causing the processor 1001 to perform operations by loading a predetermined software (program) onto hardware such as the processor 1001 and the storage device 1002, and controlling the communication by the communication device 1004, or controlling at least one of reading and writing data in the storage device 1002 and the auxiliary storage device 1003.

[0087] The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the above-described control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0088] Also, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes according to these. As the program, a program for causing 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. 12 may be stored in the storage device 1002 and realized by a control program operating on the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in FIG. 13 may be stored in the storage device 1002 and realized by a control program operating on the processor 1001. Although it has been described that the above various processes are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

[0089] The storage device 1002 is a computer-readable recording medium and may be constituted by at least one of, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may be referred to as a register, cache, main memory (main storage device), etc. The storage device 1002 can store a program (program code), software module, etc. executable for implementing the communication method according to an embodiment of the present disclosure.

[0090] The auxiliary storage device 1003 is a computer-readable recording medium, and may be constituted by, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. The above-described storage medium may be, for example, a database, a server, or other appropriate medium including at least one of the storage device 1002 and the auxiliary storage device 1003.

[0091] The communication device 1004 is hardware (a transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). For example, a transmission / reception antenna, an amplifier section, a transmission / reception section, a transmission line interface, etc. may be realized by the communication device 1004. The transmission / reception section may be physically or logically separated into a transmission section and a reception section.

[0092] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (e.g., a touch panel).

[0093] Also, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using different buses for each device.

[0094] Also, the base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0095] (Summary of Embodiment) As described above, according to the embodiment of the present invention, there is provided a terminal having a receiving unit that receives an instruction to activate or deactivate a secondary cell using a single MAC-CE (Medium Access Control - Control Element) and a trigger notification of a temporary RS (Reference Signal) from a base station, a control unit that, when the instruction is an instruction to activate the secondary cell, executes synchronization and measurement in the secondary cell using the temporary RS based on the trigger notification, and a transmitting unit that transmits a CSI (Channel State Information) report based on the measurement result of the temporary RS to the base station.

[0096] With the above configuration, when activating the secondary cell, the terminal 20 can receive a MAC-CE including information related to the trigger of the temporary RS, and by using the temporary RS instead of the SSB, the secondary cell activation delay can be shortened. That is, in the radio communication system, the delay related to the activation of the secondary cell can be shortened.

[0097] The trigger notification may indicate whether to use the temporary RS. With this configuration, when activating the secondary cell, the terminal 20 can receive a MAC-CE including information related to the trigger of the temporary RS, and by using the temporary RS instead of the SSB, the secondary cell activation delay can be shortened.

[0098] The trigger notification may be set for the secondary cell activated by the instruction. With this configuration, when activating the secondary cell, the terminal 20 can receive a MAC-CE including information related to the trigger of the temporary RS, and by using the temporary RS instead of the SSB, the secondary cell activation delay can be shortened.

[0099] The trigger notification may be commonly set for all secondary cells activated by the instruction. With this configuration, when activating the secondary cell, the terminal 20 can receive a MAC-CE including information related to the trigger of the temporary RS, and by using the temporary RS instead of the SSB, the secondary cell activation delay can be shortened.

[0100] The control unit may obtain the time resource position or frequency resource position of the temporary RS based on the trigger notification. With this configuration, when activating the secondary cell, the terminal 20 can receive a MAC-CE including information related to the trigger of the temporary RS, and by using the temporary RS instead of the SSB, the secondary cell activation delay can be shortened.

[0101] Further, according to an embodiment of the present invention, there is provided a communication method in which a terminal executes a reception procedure of receiving, from a base station, an instruction to activate or deactivate a secondary cell by a single MAC-CE (Medium Access Control - Control Element) and a trigger notification of a temporary RS (Reference Signal), a control procedure of executing synchronization and measurement in the secondary cell using the temporary RS based on the trigger notification when the instruction is an instruction to activate the secondary cell, and a transmission procedure of transmitting a CSI (Channel State Information) report based on a measurement result of the temporary RS to the base station.

[0102] With the above configuration, when activating the secondary cell, the terminal 20 can receive a MAC-CE including information related to the trigger of the temporary RS and use the temporary RS instead of the SSB, thereby shortening the secondary cell activation delay. That is, in a wireless communication system, the delay related to the activation of the secondary cell can be shortened.

[0103] (Supplement to the embodiment) The embodiments of the present invention have been described above. However, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, corrections, alternatives, substitutions, etc. Although specific numerical examples have been used for explanation to facilitate understanding of the invention, unless otherwise specified, those numerical values are merely examples and any appropriate values may be used. The classification of items in the above description is not essential to the present invention, and matters described in two or more items may be used in combination as needed, or matters described in one item may be applied to matters described in another item (as long as there is no contradiction). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. The operations of multiple functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by multiple components. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as there is no contradiction. For convenience of explanation of the processing, the base station 10 and the terminal 20 have been described using functional block diagrams, but such devices may be realized by hardware, software, or a combination thereof. The software operating on the processor included in the base station 10 according to the embodiment of the present invention and the software operating on the processor included in the terminal 20 according to the embodiment of the present invention may each be stored in a random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk drive (HDD), removable disk, CD-ROM, database, server, or any other appropriate storage medium.

[0104] Furthermore, the notification of information is not limited to the aspects / embodiments described in this disclosure, and other methods may be used. For example, the notification of information may be implemented by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, notification information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. Also, the RRC signaling may be referred to as an RRC message, and for example, it may be an RRC connection setup message, an RRC connection reconfiguration message, etc.

[0105] Each aspect / embodiment described in this disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other suitable systems, and next-generation systems extended based on these. Also, multiple systems may be combined (e.g., a combination of at least one of LTE and LTE-A and 5G, etc.) and applied.

[0106] The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this specification may be reordered as long as there is no contradiction. For example, for the methods described in this disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0107] The specific operations assumed to be performed by the base station 10 in this specification may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 can be performed by at least one of the base station 10 and other network nodes other than the base station 10 (for example, but not limited to, MME or S-GW, etc.). Although the case where there is one other network node other than the base station 10 is exemplified above, the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW).

[0108] The information or signals, etc. described in this disclosure can be output from an upper layer (or lower layer) to a lower layer (or upper layer). They may also be input and output via a plurality of network nodes.

[0109] The input and output information, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. The input and output information, etc. can be overwritten, updated, or appended. The output information, etc. may be deleted. The input information, etc. may be transmitted to other devices.

[0110] The determination in this disclosure may be made by a value represented by 1 bit (0 or 1), or by a Boolean value (true or false), or by a numerical comparison (for example, comparison with a predetermined value).

[0111] Software should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by any other name.

[0112] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0113] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be referred to throughout the above description, may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0114] Note that terms described in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, a signal may be a message. Also, a Component Carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0115] The terms "system" and "network" used in this disclosure are used interchangeably.

[0116] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, relative values from a predetermined value, or another corresponding piece of information. For example, a radio resource may be indicated by an index.

[0117] The names used for the above-described parameters are not limiting names in any way. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any way.

[0118] In the present disclosure, terms such as "base station (BS: Base Station)", "radio base station", "base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier" can be used interchangeably. The base station may also be called by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0119] A base station can accommodate one or more (e.g., three) cells. When the 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 by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of a base station and a base station subsystem that provides communication services in this coverage.

[0120] In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" can be used interchangeably.

[0121] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terms.

[0122] At least one of the base station and the mobile station may also be called a transmission device, a reception device, a communication device, etc. Note that at least one of the base station and the mobile station may also be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or unmanned). Note that at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0123] In addition, the base station in the present disclosure may be replaced by a user terminal. For example, for a configuration in which communication between the base station and the user terminal is replaced with communication between a plurality of terminals 20 (which may be referred to as, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the base station 10 described above may be configured as functions of the terminal 20. Also, terms such as "uplink" and "downlink" may be replaced with terms corresponding to communication between terminals (for example, "side"). For example, the uplink channel, downlink channel, etc. may be replaced with side channels.

[0124] Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the functions of the user terminal described above may be configured as functions of the base station.

[0125] As used herein, the terms "determining" and "deciding" may encompass a variety of operations. "Determining" and "deciding" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching a table, database, or other data structure), ascertaining, and considering something as having been "determined" or "decided". Additionally, "determining" and "deciding" may include considering something as having been "determined" or "decided" based on receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in memory), and the like. Further, "determining" and "deciding" may include considering something as having been "determined" or "decided" based on resolving, selecting, choosing, establishing, comparing, and the like. That is, "determining" and "deciding" may include considering something as having been "determined" or "decided" based on performing some operation. Also, "determining (deciding)" may be read as "assuming", "expecting", "considering", etc.

[0126] The terms "connected" or "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed". As used in this disclosure, two elements can be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, and also using electromagnetic energy having wavelengths in radio frequency regions, microwave regions, and optical (both visible and invisible) regions, as some non-limiting and non-exhaustive examples.

[0127] The reference signal can also be abbreviated as RS (Reference Signal) and may be called a Pilot according to the applicable standard.

[0128] As used in this disclosure, the description "based on" does not mean "based only on" unless otherwise specified. In other words, the description "based on" means both "based only on" and "based at least on".

[0129] Any reference to an element using designations such as "first", "second", etc. used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed, or that the first element must precede the second element in any form.

[0130] In the configuration of each of the above devices, "means" can be replaced with "section", "circuit", "device", etc.

[0131] In the present disclosure, when the terms "include", "including" and their variants are used, these terms are intended to be inclusive, in the same way as the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0132] A wireless frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) that does not depend on numerology.

[0133] Numerology may be communication parameters applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate at least one of, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame configuration, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, and the like.

[0134] A slot may be composed of one or more symbols (such as OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A slot may be a time unit based on numerology.

[0135] A slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, a mini-slot may be called a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (or PUSCH) mapping type B.

[0136] A radio frame, a sub-frame, a slot, a mini-slot, and a symbol all represent time units for transmitting signals. Different names corresponding to each of them may also be used.

[0137] For example, one sub-frame may be called a Transmission Time Interval (TTI), or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be a sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, a mini-slot, etc. instead of a sub-frame.

[0138] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used in each terminal 20) to each terminal 20 in TTI units. Note that the definition of the TTI is not limited to this.

[0139] The TTI may be a transmission time unit such as a channel-coded data packet (transport block), code block, codeword, etc., or may be a processing unit such as scheduling or link adaptation. When the TTI is given, the time interval (e.g., the number of symbols) in which a transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0140] Note that when one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (mini-slot number) constituting the minimum time unit for the scheduling may be controlled.

[0141] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8 - 12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI shorter than the normal TTI may be called a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, mini-slot, sub-slot, slot, etc.

[0142] Note that a long TTI (e.g., normal TTI, subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) may be read as a TTI having a TTI length less than that of the long TTI and not less than 1 ms.

[0143] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or a plurality of consecutive subcarriers. The number of subcarriers included in the RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in the RB may be determined based on the numerology.

[0144] Also, the time domain of the RB may include one or more symbols, and may have the length of 1 slot, 1 mini-slot, 1 sub-frame, or 1 TTI. 1 TTI, 1 sub-frame, etc. may each be composed of one or more resource blocks.

[0145] Note that one or more RBs may be referred to as physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc.

[0146] Also, a resource block may be composed of one or more resource elements (REs). For example, 1 RE may be a radio resource area of 1 sub-carrier and 1 symbol.

[0147] A bandwidth part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0148] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). For the terminal 20, one or more BWPs may be set within one carrier.

[0149] At least one of the set BWPs may be active, and the terminal 20 may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0150] The structures such as the above-described radio frames, sub-frames, slots, mini-slots, and symbols are merely exemplary. For example, the number of sub-frames included in a radio frame, the number of slots per sub-frame 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 sub-carriers included in an RB, and the number of symbols within a TTI, symbol length, cyclic prefix (CP) length, etc. can be variously changed.

[0151] In the present disclosure, for example, when an article is added by translation, such as a, an, and the in English, the present disclosure may include that the noun following these articles is in the plural form.

[0152] In the present disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separate", "coupled", etc. may also be interpreted in the same way as "different".

[0153] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched and used during execution. Also, the notification of predetermined information (for example, the notification of "being X") is not limited to being explicitly performed, and may be performed implicitly (for example, by not performing the notification of the predetermined information).

[0154] As described above in detail, it is obvious 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 modified and changed aspects without departing from the spirit and scope of the present disclosure defined by the claims. Therefore, the description of the present disclosure is for the purpose of exemplification and has no restrictive meaning for the present disclosure.

Description of Reference Numerals

[0155] 10 Base station 110 Transmission unit 120 Reception unit 130 Setting unit 140 Control unit 20 Terminal 210 Transmission unit 220 Reception unit 230 Setting unit 240 Control unit 1001 Processor 1002 Memory device 1003 Auxiliary memory device 1004 Communication device 1005 Input device 1006 Output device

Claims

1. A receiving unit that receives, from a base station, an instruction to activate or deactivate a secondary cell and a trigger notification of TRS (Tracking RS) by a single MAC-CE (Medium Access Control - Control Element); a control unit that, when the instruction is an instruction to activate a secondary cell, activates the secondary cell using the TRS corresponding to the TRS setting ID included in the trigger notification; The receiving unit receives, from the base station by RRC (Radio Resource Control) signaling, a trigger offset, information related to QCL (Quasi co located), and the number of transmissions associated with the TRS setting ID; The control unit is a terminal that applies the trigger offset, the information related to the QCL, and the number of transmissions to the reception of the TRS.

2. The terminal according to claim 1, wherein the control unit assumes that when the instruction is an instruction to activate a first secondary cell, the trigger notification associated with the first secondary cell is included in the single MAC-CE, and when the instruction is an instruction to deactivate a second secondary cell, the trigger notification associated with the second secondary cell is not included in the single MAC-CE.

3. A procedure in which a terminal receives, from a base station, an instruction to activate or deactivate a secondary cell and a trigger notification of TRS (Tracking RS) by a single MAC-CE (Medium Access Control - Control Element); a procedure in which, when the instruction is an instruction to activate a secondary cell, the secondary cell is activated using the TRS corresponding to the TRS setting ID included in the trigger notification; a procedure in which a trigger offset, information related to QCL (Quasi co located), and the number of transmissions associated with the TRS setting ID are received from the base station by RRC (Radio Resource Control) signaling; A communication method in which the terminal executes a procedure of applying the trigger offset, the information related to the QCL, and the number of transmissions to the reception of the TRS.

4. A transmitting unit that transmits to a terminal an instruction to activate or deactivate a secondary cell and a trigger notification of a TRS (Tracking RS) by a single MAC-CE (Medium Access Control - Control Element), a control unit that activates the secondary cell using a TRS corresponding to a TRS setting ID included in the trigger notification when the instruction is an instruction to activate the secondary cell, wherein the transmitting unit transmits a trigger offset, information related to QCL (Quasi co located), and the number of transmissions associated with the TRS setting ID to the terminal by RRC (Radio Resource Control) signaling, and the control unit is a base station that applies the trigger offset, the information related to QCL, and the number of transmissions to the transmission of the TRS.

5. A communication system including a terminal and a base station, wherein the terminal, a receiving unit that receives from the base station an instruction to activate or deactivate a secondary cell and a trigger notification of a TRS (Tracking RS) by a single MAC-CE (Medium Access Control - Control Element), a control unit that activates the secondary cell using a TRS corresponding to a TRS setting ID included in the trigger notification when the instruction is an instruction to activate the secondary cell, wherein the receiving unit receives a trigger offset, information related to QCL (Quasi co located), and the number of transmissions associated with the TRS setting ID from the base station by RRC (Radio Resource Control) signaling, and the control unit applies the trigger offset, the information related to QCL, and the number of transmissions to the reception of the TRS, wherein the base station, a transmitting unit that transmits the instruction and the trigger notification to the terminal, a control unit that activates the secondary cell using a TRS corresponding to a TRS setting ID included in the trigger notification when the instruction is an instruction to activate the secondary cell, and the transmitting unit transmits the trigger offset, the information related to QCL, and the number of transmissions to the terminal by RRC signaling, A communication system in which the control unit applies the trigger offset, information related to the QCL, and the number of transmissions to the transmission of the TRS.

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