Terminal, Communication Method, and Wireless Communication System

Abstract

This terminal comprises: a reception unit which receives information for giving an instruction to activate a secondary cell; a control unit which activates the secondary cell on the basis of a temporary reference signal, which is transmitted in the secondary cell on the basis of the information received by the reception unit, at a timing after the reception unit receives the information and before the reception unit receives a first sync signal block in time via the secondary cell after receiving the information; and a transmission unit which reports channel status information based on the temporary reference signal.

Description

Technical Field

[0001] The present invention relates to a terminal and a base station in a wireless 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 a radio section, etc., a wireless communication method called 5G or NR (New Radio) (hereinafter, this wireless 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 wireless technologies and network architectures are being studied.

[0003] Regarding 3GPP Release 17, a study on Further Multi-RAT Dual-Connectivity enhancement (MR-DC / CA) is being conducted (Non-Patent Document 1). The study items in the study on the enhancement of MR-DC / CA include the study of a mechanism for efficient activation / deactivation of a secondary cell (SCell).

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] In New Radio (NR), the transmission periodicity of the Synchronization Signal Block (SSB) may be a large value (for example, 20 ms, 160 ms). In this case, among the SCell activation delays, T FirstSSB becomes a relatively large value, and the time required for the terminal to complete the activation of the SCell after receiving the SCell activation command may be long.

[0006] A method that enables shortening the SCell activation delay is required.

Means for Solving the Problem

[0007] According to the disclosed technology, a receiving unit that receives information instructing activation of a secondary cell, and based on the information received by the receiving unit, at a timing after reception of the information, which is a timing after reception of the information and before the receiving unit receives the first synchronization signal block with respect to time via the secondary cell, based on a provisional reference signal transmitted by the secondary cell, at least time synchronization and frequency synchronization are performed to activate the secondary cell, a control unit for performing activation of the secondary cell, and a transmission unit for reporting channel state information based on the provisional reference signal. The information instructing activation of the secondary cell includes trigger information of the provisional reference signal, and the information instructing activation of the secondary cell further includes information specifying a plurality of indexes corresponding to a plurality of secondary cells and instruction information for activation or deactivation of each of the plurality of secondary cells. mi , The trigger information of the provisional reference signal includes information indicating the resource positions in the time and frequency domains of the provisional reference signal. a terminal, is provided.

Advantages of the Invention

[0008] According to the disclosed technology, a method that enables shortening the SCell activation delay is provided.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments 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 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 may be used as appropriate. The existing technologies are, for example, existing NR or LTE, but are not limited to existing NR or LTE.

[0012] (System Configuration) FIG. 1 is a diagram for explaining a wireless communication system according to an embodiment of the present invention. The wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20 as shown in FIG. 1. Although one base station 10 and one terminal 20 are shown in FIG. 1, this is an example, and there may be a plurality of each.

[0013] 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 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 subframe.

[0014] The base station 10 can perform 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 PCell (Primary Cell) and one or more SCells (Secondary Cells) are used.

[0015] The base station 10 transmits synchronization signals, 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 called 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.

[0016] 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.

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

[0018] FIG. 2 shows a configuration example of a wireless communication system when DC (Dual connectivity) is executed. As shown in FIG. 2, a base station 10A serving as an MN (Master Node) and a base station 10B serving as an SN (Secondary Node) are provided. The base station 10A and the base station 10B are each connected to the core network. The terminal 20 can communicate with both the base station 10A and the base station 10B.

[0019] A cell group provided by the base station 10A serving as the MN is called an MCG (Master Cell Group), and a cell group provided by the base station 10B serving as the SN is called an SCG (Secondary Cell Group). Also, in DC, the MCG is composed of one PCell and one or more SCells, and the SCG is composed of one PSCell (Primary SCell) and one or more SCells.

[0020] The processing operations in the present embodiment may be executed with the system configuration shown in FIG. 1, may be executed with the system configuration shown in FIG. 2, or may be executed with a system configuration other than these.

[0021] Regarding Release 17 of the 3rd Generation Partnership Project (3GPP), a study on Further Multi-RAT Dual-Connectivity enhancement of MR-DC / CA is being conducted.

[0022] The study items in the study on the enhancement of MR-DC / CA include the study of an efficient activation / deactivation mechanism for the Secondary Cell (SCell).

[0023] When the terminal 20 is performing carrier aggregation, it is possible to deactivate (inactivate) the Secondary Cell (SCell). When the secondary cell is in an inactivated state, since the terminal 20 does not monitor the PDCCH, etc., it is possible to reduce power consumption.

[0024] (Known Cell) When the terminal 20 receives an instruction to activate the SCell, it is necessary to perform preprocessing for data transmission and reception. The preprocessing includes at least the process of the terminal 20 decoding the received MAC command, the PSS / SSS detection of the target SCell, time and frequency synchronization processing, and the processing related to CSI report.

[0025] However, depending on the operation and propagation conditions, the terminal 20 may not need to perform some of the preprocessing required for connection to the SCell.

[0026] For example, it is possible that the measurement of L3-RSRP is completed immediately before receiving an instruction to activate the SCell, and if there is such prior information, it may not be necessary to perform the PSS / SSS detection of the target SCell.

[0027] When the terminal 20 holds the prior information of such a SCell, the corresponding SCell is called a known cell. In the case of FR1, it is assumed that if the SCell is a known cell, it is possible to shorten part of the SCell activation delay. In the base station 10, after transmitting the SCell activation command, it becomes possible to perform scheduling earlier.

[0028] (Condition of known cell) For FR1, the conditions under which a SCell can be regarded as a known cell are defined.

[0029] The FR1 SCell is known if it meets the following conditions: · For FR1, within a period equal to max([5] measCycleScell, [5] DRX cycles) before receiving the SCell activation command, the terminal 20 has transmitted a valid measurement report for the SCell to be activated, and according to the cell identification condition, the measured SSB remains detectable. · The SSB measured within a period equal to max([5] measCycleScell, [5] DRX cycles) before receiving the SCell activation command remains detectable during the SCell activation delay according to the cell identification condition.

[0030] In other cases, the FR1 SCell is unknown.

[0031] When the terminal 20 activates the SCell from the deactivated state (in the terminal 20, the SCell transitions to the activated state), it takes time to activate the SCell. The time required for the terminal 20 to activate the deactivated SCell may be referred to as the SCell activation delay. For example, when the terminal 20 receives an SCell activation command (Medium Access Control Control Element (MAC CE)) via the PCell in slot n, the terminal 20 will resume the operations (e.g., CSI reporting operations) of the SCell in the activated state until the time of T HARQ +T activation_time +T CSI_Reporting has elapsed since slot n.

[0032] Figure 3 is a diagram showing an example of the SCell activation delay. As shown in Figure 3, first, in the terminal 20, the SCell is in the deactivated state. In step S101, the terminal 20 receives an SCell activation command (Medium Access Control Control Element (MAC CE)) from the base station 10 via the PCell, for example.

[0033] After receiving the SCell activation command, in step S102, the terminal 20 transmits an acknowledgement (ACK) for the SCell activation command to the base station 10 via the PCell. Here, as shown in Figure 3, after the terminal 20 receives the SCell activation command, the time until it transmits the ACK for the SCell activation command in step 102 may be T HARQ or so.

[0034] Thereafter, at step S103, the terminal 20 receives the first SSB transmitted from the SCell. As shown in FIG. 3, the time from when the terminal 20 transmits an ACK at step S102 until the terminal 20 receives the first SSB at step S103 is 3 ms + TFirstSSB and it may be. Here, 3 ms is the time for the terminal 20 to perform processing of MAC CE, preparation of the radio circuit, etc., and T FirstSSB may be the time from when 3 ms has elapsed after the terminal 20 transmits an ACK at step S102 until the resource of the first SSB transmitted from the SCell by the terminal 20.

[0035] Thereafter, at step S104, the terminal 20 performs a CSI report on the SCell. Thereafter, in the terminal 20, the SCell becomes an activated state. As shown in FIG. 3, the time from when the terminal 20 receives the first SSB transmitted from the SCell at step S103 until the terminal 20 performs a CSI report on the SCell at step S104 is 2 ms + T CSI_Reporting and it may be. Here, 2 ms may be the time for the terminal 20 to perform processing of the SSB, setting of AGC, etc. T CSI_Reporting may include the time from when 2 ms has elapsed after the terminal 20 receives the first SSB transmitted from the SCell at step S103 until the CSI measurement resource, the time for the terminal 20 to perform CSI measurement and reporting processing, and the time from when the terminal 20 completes the CSI measurement and reporting processing until the CSI report resource.

[0036] Note that the SCell activation delay in FIG. 3 is an example, and different SCell activation delays are assumed depending on several conditions such as whether the SCell is a known cell or an unknown cell. The embodiments described below may be applied to those different SCell activation delays.

[0037] In New Radio (NR), the transmission periodicity of the Synchronization Signal Block (SSB) may be a large value (for example, 20 ms, 160 ms). In this case, among the SCell activation delays, T FirstSSB becomes a relatively large value (compared to other required times in the SCell activation delay), and the time required for the terminal 20 to complete the activation of the SCell after receiving the SCell activation command becomes long.

[0038] Time synchronization, frequency synchronization, and setting of automatic gain control (AGC), etc., which are assumed to be performed by the terminal 20 based on the SCell's SSB, can also be performed based on the SCell's tracking reference signal (TRS), the SCell's CSI-RS, etc. instead of the SCell's SSB. Therefore, the terminal 20 may be able to shorten the SCell activation delay by receiving the SCell's TRS, the SCell's CSI-RS, etc. at an appropriate timing earlier than the SCell's SSB. In the following description, the SCell's TRS and / or the SCell's CSI-RS, etc., transmitted at an appropriate timing earlier than the SCell's SSB are referred to as temporary RS (temporary reference signal). Note that the temporary RS is not limited to the SCell's TRS and / or the SCell's CSI-RS transmitted at an appropriate timing earlier than the SCell's SSB, and may be the SCell's demodulation reference signal (DMRS), the SCell's Phase Tracking Reference Signal (PT-RS), the SCell's Positioning Reference Signal (PRS), etc. transmitted at an appropriate timing earlier than the SCell's SSB.

[0039] (Proposal 1) The base station 10 may notify the terminal 20 of the instruction information for activating the SCell and the trigger information of the temporary RS by means of DCI and / or MAC CE. As the notification method of the instruction information for activating the SCell and the trigger information of the temporary RS, one or more of the following Option1 to Option4 may be supported.

[0040] (Option1) Both the instruction information for activating the SCell and the trigger information of the temporary RS may be included in a single DCI or a single MAC CE.

[0041] Note that the trigger information of the temporary RS may include information indicating the resource position of the time and frequency domain of the temporary RS and the like.

[0042] As the notification method of the trigger information of the temporary RS, the existing trigger notification of the aperiodic CSI-RS may be used (as it is or modified). Alternatively, a new notification method may be defined as the notification method of the trigger information of the temporary RS.

[0043] FIG. 4 is a diagram showing an operation example of Option1 described above. As shown in FIG. 4, first, in the terminal 20, the SCell is in a deactivated state. In step S201, the terminal 20 receives, for example, an SCell activation instruction from the base station 10 via the PCell. By receiving the SCell activation instruction, the terminal 20 receives the trigger information of the temporary RS. Therefore, the terminal 20 determines information regarding the temporary RS transmitted by the secondary cell (which may include information indicating the resource position of the time and frequency domain of the temporary RS) at the timing after receiving the SCell activation instruction and before the terminal 20 receives the first SSB with respect to time after receiving the instruction.

[0044] After receiving the SCell activation instruction, the terminal 20 transmits an acknowledgement (ACK) for the SCell activation instruction to the base station 10 via the PCell in step S202.

[0045] Thereafter, the terminal 20 receives the temporary RS transmitted from the SCell in step S203, and based on the received temporary RS, performs time synchronization, frequency synchronization, setting of automatic gain control (AGC), etc.

[0046] Thereafter, the terminal 20 performs a CSI report for the SCell in step S204. Thereafter, in the terminal 20, the SCell is in an activated state.

[0047] In the case of the example in FIG. 4, after receiving the SCell activation instruction, the terminal 20 receives the temporary RS transmitted at a timing earlier than the first transmitted SSB, performs time synchronization, frequency synchronization, setting of automatic gain control (AGC), etc., and can perform a CSI report for the SCell. Therefore, compared with the SCell activation delay in the example shown in FIG. 3, it is possible to shorten the SCell activation delay.

[0048] (Option2) The instruction information for activating the SCell may be notified by DCI, and the trigger information of the temporary RS may be notified by another DCI. The instruction information for activating the SCell may be notified by MAC CE, and the trigger information of the temporary RS may be notified by another MAC CE. The instruction information for activating the SCell may be notified by DCI, and the trigger information of the temporary RS may be notified by MAC CE. The instruction information for activating the SCell may be notified by MAC CE, and the trigger information of the temporary RS may be notified by DCI.

[0049] Note that the trigger information of the temporary RS may include information indicating the time of the temporary RS and the resource position in the time and frequency domains, etc.

[0050] As a method for notifying the trigger information of the temporary RS, the existing trigger notification of the aperiodic CSI-RS may be used (as it is or after being modified). Alternatively, a new notification method may be defined as the method for notifying the trigger information of the temporary RS.

[0051] (Option2-1) When the terminal 20 receives the instruction information for activating the SCell and the trigger information of the temporary RS within a certain period, it may use the temporary RS to activate the SCell.

[0052] The base station 10 may notify the terminal 20 of the "certain period" by means of RRC signaling or the like. Also, the "certain period" may be defined in the specification. For example, the "certain period" may be 1 slot or X slots (X > 1). The "certain period" may be Y ms. For example, Y ms may be determined based on the transmission period of the SSB. For example, when the transmission period of the SSB is Z ms, Y < Z / N, (N > 1) may be satisfied. Also, based on the position of the next SSB assumed by the terminal, the end timing of the "certain period" may be notified or defined. For example, the time position X slots before or Y ms before the next SSB assumed by the terminal may be used as the end timing of the "certain period". Or, based on the position of the next TRS (e.g., periodic TRS) assumed by the terminal, the end timing of the "certain period" may be notified or defined. For example, the time position X slots before or Y ms before the next TRS assumed by the terminal may be used as the end timing of the "certain period".

[0053] If the terminal 20 receives the trigger information of the temporary RS within a certain period from the timing when it receives the instruction information for activating the SCell, it may activate the SCell using the temporary RS. Alternatively, if the terminal 20 receives the instruction information for activating the SCell within a certain period from the timing when it receives the trigger information of the temporary RS, it may activate the SCell using the temporary RS.

[0054] (Option2-2) The base station 10 may notify the instruction information for activating the SCell including information indicating whether the trigger information of the temporary RS will be transmitted after the transmission of the instruction information for activating the SCell. When the terminal 20 receives the instruction information for activating the SCell, it may assume whether to receive the trigger information of the temporary RS based on the information indicating whether the trigger information of the temporary RS will be transmitted after the transmission of the instruction information for activating the SCell included in the instruction information for activating the SCell. When the information indicating that the trigger information of the temporary RS will be transmitted after the transmission of the instruction information for activating the SCell is included in the instruction information for activating the SCell, the terminal 20 attempts to receive the trigger information of the temporary RS. If the trigger information of the temporary RS cannot be received within a certain period after receiving the instruction information for activating the SCell, the terminal 20 may perform an operation to activate the normal SCell. The operation to activate the normal SCell may be, for example, an operation to activate using the SSB.

[0055] FIG. 5 is a diagram showing an operation example of Option 2 described above. As shown in FIG. 5, first, in the terminal 20, the SCell is in a deactivated state. In step S301, the terminal 20 receives an SCell activation instruction from the base station 10 via, for example, the PCell. In step S302, the terminal 20 receives the trigger information of the temporary RS within a certain period after receiving the SCell activation instruction in step 301. Therefore, the terminal 20 determines information regarding the temporary RS transmitted by the secondary cell (which may include information indicating the time and frequency domain resource position of the temporary RS) at the timing after receiving the SCell activation instruction, which is the timing after receiving the SCell activation instruction and before the terminal 20 receives the first SSB with respect to time after receiving the command.

[0056] After receiving the SCell activation instruction, in step S303, the terminal 20 transmits an affirmative response (ACK) to the SCell activation instruction to the base station 10 via the PCell.

[0057] Thereafter, in step S304, the terminal 20 receives the temporary RS transmitted from the SCell, and based on the received temporary RS, performs time synchronization, frequency synchronization, setting of automatic gain control (AGC), etc.

[0058] Thereafter, in step S305, the terminal 20 performs a CSI report for the SCell. Thereafter, in the terminal 20, the SCell becomes an activated state.

[0059] In the case of the example in FIG. 5, after receiving the SCell activation instruction, the terminal 20 receives the temporary RS transmitted at a timing earlier than the first transmitted SSB, performs time synchronization, frequency synchronization, setting of automatic gain control (AGC), etc., and can perform CSI reporting for the SCell. Therefore, compared with the SCell activation delay in the example shown in FIG. 3, it is possible to shorten the SCell activation delay.

[0060] Note that in the example of FIG. 5, in step S303, the terminal 20 transmits an affirmative response (ACK) to the SCell activation instruction to the base station 10 via the PCell. However, the embodiments of the present invention are not limited to this example.

[0061] For example, starting from the timing of receiving the SCell activation instruction, one ACK transmission timing for receiving the SCell activation instruction and the trigger information of the temporary RS may be defined or notified. One ACK transmitted by the terminal 20 may include information indicating that it is an ACK for receiving the SCell activation instruction and the trigger information of the temporary RS.

[0062] For example, starting from the timing of receiving the trigger information of the temporary RS, one ACK transmission timing for receiving the SCell activation instruction and the trigger information of the temporary RS may be defined or notified. One ACK transmitted by the terminal 20 may include information indicating that it is an ACK for receiving the SCell activation instruction and the trigger information of the temporary RS.

[0063] For example, regarding the reception of SCell activation indication, starting from the timing of receiving the SCell activation indication, one ACK for the reception of the SCell activation indication is transmitted. And regarding the reception of the trigger information of the temporary RS, starting from the timing of receiving the trigger information of the temporary RS, one ACK for the reception of the trigger information of the temporary RS may be transmitted (that is, separate ACKs may be transmitted for the reception of the SCell activation indication and the reception of the trigger information of the temporary RS, respectively).

[0064] (Option3) The terminal 20 may recognize that the trigger information of the temporary RS is notified by DCI and / or MAC CE, and the indication information for implicitly activating the SCell is notified by the trigger information of the temporary RS.

[0065] Note that the trigger information of the temporary RS may include information indicating the resource position in the time and frequency domains of the temporary RS, etc.

[0066] As a method for notifying the trigger information of the temporary RS, the existing aperiodic CSI-RS trigger notification may be used (either as it is or modified). Alternatively, a new notification method may be defined as a method for notifying the trigger information of the temporary RS.

[0067] FIG. 6 is a diagram showing an operation example of Option 3 described above. As shown in FIG. 6, first, in the terminal 20, the SCell is in a deactivated state. In step S401, the terminal 20 receives, via the PCell for example, the trigger information of the temporary RS from the base station 10. In response to receiving the trigger information of the temporary RS in step S401, the terminal 20 starts an operation to activate the SCell. Based on the trigger information of the temporary RS, the terminal 20 determines information regarding the temporary RS transmitted by the secondary cell (which may include information indicating the time and frequency - domain resource position of the temporary RS) at a timing after receiving the trigger information of the temporary RS, and before the terminal 20 receives the first SSB with respect to time after receiving the information.

[0068] After receiving the trigger information of the temporary RS, in step S402, the terminal 20 transmits an SCell activation instruction or an affirmative response (ACK) to the trigger notification of the temporary RS to the base station 10 via the PCell.

[0069] Thereafter, in step S404, the terminal 20 receives the temporary RS transmitted from the SCell, and based on the received temporary RS, performs time synchronization, frequency synchronization, setting of automatic gain control (AGC), etc.

[0070] Thereafter, in step S405, the terminal 20 performs a CSI report for the SCell. Thereafter, in the terminal 20, the SCell becomes an activated state.

[0071] In the case of the example in FIG. 6, after receiving the trigger information of the temporary RS, the terminal 20 receives the temporary RS transmitted at a timing earlier than the first transmitted SSB, performs time synchronization, frequency synchronization, setting of automatic gain control (AGC), etc., and can perform CSI reporting for the SCell. Therefore, compared with the SCell activation delay in the example shown in FIG. 3, it is possible to shorten the SCell activation delay.

[0072] (Option4) When the instruction information for activating a normal SCell is notified by MAC CE, the terminal 20 may perform an operation to activate the normal SCell assuming that the trigger information of the temporary RS is not notified (the temporary RS is not available). Note that Option 3 and Option 4 may be combined. That is, when the trigger information of the temporary RS is notified by DCI and / or MAC CE, the terminal 20 may recognize that the instruction information for activating the SCell is implicitly notified by the trigger information of the temporary RS. When the trigger information of the temporary RS is not notified and the instruction information for activating the normal SCell is notified by MAC CE, the terminal 20 may recognize that the trigger information of the temporary RS is not notified. For example, even when the upper layer signaling related to the SCell activation operation using the temporary RS is set in the terminal, when the instruction information for activating the conventional SCell is notified by MAC CE, assuming that the trigger information of the temporary RS is not notified (the temporary RS is not available), the operation of activating the normal SCell may be performed.

[0073] (Proposal 2) The base station 10 may notify the terminal 20 of activation instructions for a plurality of SCell and / or trigger information for the temporary RS of the plurality of SCell, based on the instruction information for activating the SCell and / or the trigger information for the temporary RS.

[0074] (Option 1 of Proposal 2) The base station 10 may include one or more SCell indexes indicating one or more SCell to be activated and / or one or more indexes for an SCell group indicating a plurality of SCell to be activated, in the instruction information for activating the SCell and / or the trigger information for the temporary RS. For example, when the base station 10 activates SCell #1 and SCell #2, the instruction information for activating the SCell may include the index #1 indicating SCell #1 and the index #2 indicating SCell #2.

[0075] (Option 2 of Proposal 2) The terminal 20 may specify the index of the SCell to be activated or the index for the SCell group, based on the specific information included in the instruction information for activating the SCell and / or the trigger information for the temporary RS, or based on the reception timing of the instruction information for activating the SCell and / or the trigger information for the temporary RS. For example, the correspondence between the resource position of the temporary RS in the time and frequency domains and the index of a specific SCell among the plurality of SCell may be predefined. In this case, the terminal 20 may specify the SCell to be activated, based on the resource position of the temporary RS in the time and frequency domains, included in the received trigger information for the temporary RS.

[0076] (Option 3 of Proposal 2) The base station 10 may include, in the instruction information for activating the SCell and / or the trigger information for the temporary RS, the instruction information for activating or deactivating each SCell among the plurality of SCells. Further, the base station 10 may include, in the instruction information for activating the SCell and / or the trigger information for the temporary RS, the instruction information for activating or deactivating each SCell group among the plurality of SCell groups. That is, not only the SCell whose activation / deactivation state is changed but also the SCell without change may be collectively notified of the activation or deactivation information. For example, the notification of the activation / deactivation state for all SCells among the plurality of SCells or all SCell groups among the plurality of SCell groups may always be included. Alternatively, the maximum number of SCells or the number of SCell groups included in the notification may be notified or specified.

[0077] For example, the base station 10 may switch whether to notify each SCell or each SCell group according to the number of SCells. According to this method, the number of bits at the time of notification can be made constant regardless of the number of SCells. For example, it may be a notification in bitmap format for a plurality of SCells or a plurality of SCell groups. For example, the field of the SCell dormancy indication may be used as it is or after being changed.

[0078] In addition, in Proposal 2, the base station 10 may preset or notify the terminal 20 of the SCell group. For example, the same SCell group as the SCell group used for the SCell dormancy indication may be used, or another SCell group may be set / notified.

[0079] The terminal 20 may transmit to the base station 10 by including in the terminal's function information (UE Capability) that the terminal 20 supports the functions of Option 1 to Option 3 of the above-mentioned Proposal 1 and / or Option 1 to Option 3 of Proposal 2. The proposal in this paper is applicable and the SCell activation operation can be performed using the temporary RS only when the upper layer signaling related to this proposal (for example, the upper layer signaling related to the temporary RS, etc.) is set in the terminal 20. When the upper layer signaling related to this proposal (for example, the upper layer signaling related to the temporary RS, etc.) is not set in the terminal 20, the conventional SCell activation operation (for example, the SCell activation operation using the SSB) may be performed.

[0080] (Device Configuration) Next, an example of the functional configuration 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 the functions for implementing the above-described embodiments. However, the base station 10 and the terminal 20 may each be provided with only the functions of any one of the proposals in the embodiments.

[0081] <Base Station 10> FIG. 7 is a diagram showing an example of the functional configuration of the base station 10. As shown in FIG. 7, 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. 7 is merely an example. As long as the operations according to the embodiments of the present invention can be executed, the function classification 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.

[0082] 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, for example, a higher layer from the received signals. Further, 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 Proposals 1 to 2.

[0083] The setting unit 130 stores preset setting information 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. Further, the transmitting unit 110 and the receiving unit 120 may be called a transmitter and a receiver, respectively.

[0084] <Terminal 20> FIG. 8 is a diagram showing an example of the functional configuration of the terminal 20. As shown in FIG. 8, 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. 8 is merely an example. As long as the operations according to the embodiments of the present invention can be executed, the functional classification and the names of the functional units may be anything. The transmitting unit 210 and the receiving unit 220 may be called a communication unit.

[0085] 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.

[0086] 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 necessary. In addition, 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.

[0087] The embodiments describe at least the following terminal, communication method, and base station. (Item 1) A receiving unit that receives information instructing to activate a secondary cell, Based on the information received by the receiving unit, at the timing after the reception of the information, before the receiving unit receives the first synchronization signal block with respect to time via the secondary cell after the reception of the information, at the timing after the reception of the information, a control unit that activates the secondary cell based on a provisional reference signal transmitted by the secondary cell, A transmission unit that reports channel state information based on the provisional reference signal, A terminal comprising the above. (Item 2) When the control unit receives information instructing the receiving unit to activate the secondary cell and trigger information of the provisional reference signal within a certain period, the control unit activates the secondary cell based on the provisional reference signal. The terminal according to Item 1. (Item 3) When the control unit does not receive information instructing the receiving unit to activate the secondary cell and trigger information of the provisional reference signal within a certain period, the control unit activates the secondary cell based on the synchronization signal block. The terminal according to Item 1. (Item 4) The information instructing to activate the secondary cell is the trigger information of the provisional reference signal. The terminal according to claim 1. (Claim 5) Receiving information instructing to activate a secondary cell; Based on the received information, at the timing after receiving the information, which is the timing after receiving the information and before receiving the first synchronization signal block with respect to time via the secondary cell after receiving the information, activating the secondary cell based on a provisional reference signal transmitted by the secondary cell; Reporting channel state information based on the provisional reference signal; A communication method by a terminal comprising: (Claim 6) A transmission unit that transmits information instructing a terminal to activate a secondary cell; Based on the information transmitted by the transmission unit, at the timing after transmitting the information, which is the timing after transmitting the information and before the transmission unit transmits the first synchronization signal block with respect to time via the secondary cell after transmitting the information, a control unit that determines that the terminal activates the secondary cell based on a provisional reference signal transmitted via the secondary cell; A reception unit that receives a report of channel state information based on the provisional reference signal; A base station comprising:

[0088] According to any of the above-described configurations, a technique is provided that enables shortening of the SCell activation delay.

[0089] (Hardware Configuration) The block diagrams (Figs. 7 and 8) used in the description of the above embodiments show blocks in terms of functions. These functional blocks (components) 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 (e.g., 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.

[0090] Functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection determination, 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 (component) that functions to transmit is called a transmitting unit or a transmitter. In any case, as described above, the realization method is not particularly limited.

[0091] 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. 9 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. The above-described base station 10 and terminal 20 may physically 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, etc.

[0092] In the following description, the term "apparatus" can be read as a circuit, device, unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the respective apparatuses shown in the figure, or may be configured without including some of the apparatuses.

[0093] Each function in the base station 10 and the terminal 20 is realized by causing a 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 communication by the communication device 1004, or controlling at least one of reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

[0094] The processor 1001 controls the entire computer by operating, for example, an operating system. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, etc. For example, the above-described control units 140, 240, etc. may be realized by the processor 1001.

[0095] Further, 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. 6 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. 7 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.

[0096] 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.

[0097] The auxiliary storage device 1003 is a computer-readable recording medium, and may be composed of, 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 disc, a digital versatile disc, a Blu-ray (registered trademark) disc), 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 auxiliary storage device 1003 may also be called an auxiliary storage. The above-described storage medium may be, for example, a database, a server, or other appropriate media including at least one of the storage device 1002 and the auxiliary storage device 1003.

[0098] 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 implement 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.

[0099] 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 external input. 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).

[0100] 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.

[0101] 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 part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0102] (Supplement of 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 variations, modifications, alternatives, substitutions, etc. Although specific numerical examples have been used for the purpose of facilitating understanding of the invention, unless otherwise specified, these 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 the matters described in two or more items may be used in combination as necessary, or the matters described in one item may be applied to the 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 the sake of convenience in explaining the processing, the base station 10 and the terminal 20 have been described using functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software that operates according to the processor included in the base station 10 in accordance with the embodiments of the present invention and the software that operates according to the processor included in the terminal 20 in accordance with the embodiments 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.

[0103] In addition, the notification of information is not limited to the aspects / embodiments described in the present 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 combinations thereof. Also, the RRC signaling may be referred to as an RRC message, and for example, it may be an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, etc.

[0104] Each aspect / embodiment described in the present 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 thereon. Also, a plurality of systems may be combined (e.g., a combination of at least one of LTE and LTE-A and 5G, etc.) and applied.

[0105] 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, regarding the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0106] 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, an MME or an 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, an MME and an S-GW).

[0107] The information or signals, etc. described in the present disclosure can be output from an upper layer (or a lower layer) to a lower layer (or an upper layer). They may also be input and output via a plurality of network nodes.

[0108] The input and output information, etc. may be stored in a specific location (for example, a 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.

[0109] The determination in the present 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).

[0110] 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.

[0111] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when 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 a transmission medium.

[0112] 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.

[0113] 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.

[0114] The terms "system" and "network" as used in this disclosure are used interchangeably.

[0115] In addition, the information, parameters, etc. described in this disclosure may be represented using absolute values, relative values from a predetermined value, or using other corresponding information. For example, radio resources may be indicated by an index.

[0116] The names used for the above-described parameters are not limiting names in any respect. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in this disclosure. Since various channels (e.g., PUSCH, PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not limiting names in any respect.

[0117] In this 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", etc. can be used interchangeably. The base station may also be called by terms such as macrocell, small cell, femtocell, picocell, etc.

[0118] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple 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 part or all of the coverage area of at least one of the base station and the base station subsystem that provides communication services in this coverage.

[0119] In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", "terminal", etc. can be used interchangeably.

[0120] A mobile station may also be called 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, terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terms.

[0121] 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 without a driver (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or non-humanoid). 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.

[0122] In addition, the base station in the present disclosure may be replaced by a terminal. For example, for a configuration in which communication between the base station and the terminal is replaced by 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 above-described base station 10 may be configured to be 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, an uplink channel, a downlink channel, etc. may be replaced with a side channel.

[0123] Similarly, the terminal in the present disclosure may be replaced by a base station. In this case, the functions of the above-described terminal may be configured to be functions of the base station.

[0124] As used herein, the terms "determining" and "decision" may include a variety of operations. "Determining" and "decision" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, and considering something to be "determined" or "decided". "Determining" and "decision" may also include receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in memory), and considering something to be "determined" or "decided". "Determining" and "decision" may further include resolving, selecting, choosing, establishing, comparing, and considering something to be "determined" or "decided". That is, "determining" and "decision" may include considering something to be the result of some operation. Also, "determining (decision)" may be replaced with "assuming", "expecting", "considering", etc.

[0125] The terms "connected" or "coupled", or any variation 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, by way of some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, and optical (both visible and invisible) regions.

[0126] The reference signal can also be abbreviated as RS (Reference Signal) and may be called a Pilot depending on the applicable standard.

[0127] 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".

[0128] Any reference to an element using the designations "first", "second", etc. as 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 way.

[0129] In the configuration of each of the above devices, "means" may be replaced with "section", "circuit", "device", etc.

[0130] In the present disclosure, when the terms "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0131] 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 referred to as a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) independent of numerology.

[0132] Numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate, for example, at least one of 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, etc.

[0133] 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.

[0134] 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.

[0135] 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 be used.

[0136] For example, one sub-frame may be called a Transmission Time Interval (TTI), 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, a period shorter than 1 ms (e.g., 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.

[0137] 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 (frequency bandwidth, transmission power, etc. 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.

[0138] 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 and link adaptation. When the TTI is given, the time interval (e.g., number of symbols) in which a transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0139] 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 (number of mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0140] 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.

[0141] Note that the long TTI (e.g., normal TTI, subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, or the 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.

[0142] 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.

[0143] Also, the time domain of the RB may include one or more symbols, and may be 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.

[0144] 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.

[0145] Also, the 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.

[0146] The 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.

[0147] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be set within 1 carrier for the UE.

[0148] At least one of the set BWPs may be active, and the UE 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".

[0149] The structures such as the above-mentioned radio frames, sub-frames, slots, mini-slots, and symbols are merely illustrative. 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, symbol length, cyclic prefix (CP) length, etc. within a TTI can be changed in various ways.

[0150] 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.

[0151] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". Note that the term may also mean "A and B are different from C respectively". Terms such as "separate", "coupled", etc. may also be interpreted in the same way as "different".

[0152] In the present disclosure, each aspect / embodiment described 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).

[0153] Note that in the present disclosure, the SS block or CSI-RS is an example of a synchronization signal or a reference signal.

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

Explanation of Signs

[0155] 10 Base station 110 Transmitter 120 Receiver 130 Setting unit 140 Control unit 20 Terminal 210 Transmitter 220 Receiver 230 Setting unit 240 Control unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims

1. a receiving unit that receives information instructing to activate a secondary cell; a control unit that activates the secondary cell by performing at least time synchronization and frequency synchronization based on a provisional reference signal transmitted by the secondary cell at a timing after reception of the information, which is a timing after reception of the information and before the receiving unit receives the first synchronization signal block with respect to time via the secondary cell after reception of the information, based on the information received by the receiving unit; a transmitting unit that reports channel state information based on the provisional reference signal; comprising; the information instructing to activate the secondary cell includes trigger information of the provisional reference signal; the information instructing to activate the secondary cell further includes information specifying a plurality of indexes corresponding to a plurality of secondary cells and instruction information for activation or non-activation of each of the plurality of secondary cells; the trigger information of the provisional reference signal includes information indicating resource positions in the time and frequency domains of the provisional reference signal; a terminal.

2. The control unit activates the secondary cell based on the provisional reference signal when the receiving unit receives the information instructing to activate the secondary cell and the trigger information of the provisional reference signal within a certain period. The terminal according to Claim 1.

3. The control unit activates the secondary cell based on the synchronization signal block when the receiving unit does not receive the information instructing to activate the secondary cell and the trigger information of the provisional reference signal within a certain period. The terminal according to Claim 1.

4. a step of receiving information instructing to activate a secondary cell; a step of activating the secondary cell by performing at least time synchronization and frequency synchronization based on a provisional reference signal transmitted by the secondary cell at a timing after reception of the information, which is a timing after reception of the information and before receiving the first synchronization signal block with respect to time via the secondary cell after reception of the information, based on the received information; A step of reporting channel state information based on the provisional reference signal; comprising; The information for instructing to activate the secondary cell includes the trigger information of the provisional reference signal; The information for instructing to activate the secondary cell further includes information for specifying a plurality of indexes corresponding to a plurality of secondary cells and instruction information for activation or deactivation for each of the plurality of secondary cells; The trigger information of the provisional reference signal includes information indicating the resource positions in the time and frequency domains of the provisional reference signal; A communication method by a terminal.

5. A wireless communication system comprising a terminal and a base station, wherein the terminal a receiving unit that receives information for instructing the terminal to activate a secondary cell; Based on the information received by the receiving unit, at the timing after receiving the information, before the receiving unit receives the first synchronization signal block with respect to time via the secondary cell after receiving the information, at the timing after receiving the information, at least time synchronization and frequency synchronization are performed based on a provisional reference signal transmitted by the secondary cell, thereby activating the secondary cell; a control unit; a transmitting unit that reports channel state information based on the provisional reference signal; comprising; The information for instructing to activate the secondary cell includes the trigger information of the provisional reference signal; The information for instructing to activate the secondary cell further includes information for specifying a plurality of indexes corresponding to a plurality of secondary cells and instruction information for activation or deactivation for each of the plurality of secondary cells; The trigger information of the provisional reference signal includes information indicating the resource positions in the time and frequency domains of the provisional reference signal; The base station includes a transmitting unit that transmits information for instructing the terminal to activate the secondary cell; A wireless communication system.

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