Terminal and communication method

Abstract

This terminal comprises: a control unit that determines resources for receiving a downlink (DL) transmission that triggers an on-demand SS / PBCH block (SSB) in a secondary cell (SCell); and a reception unit that receives the DL transmission from a base station on the resources. The reception unit receives an SSB from the base station in the SCell, and the control unit determines the SCell.

Description

Terminal and communication method

[0001] The present invention relates to a terminal and a communication method in a wireless communication system.

[0002] For NR (New Radio) (also known as "5G"), the successor system to LTE (Long Term Evolution), technologies are being considered that satisfy the requirements of a large-capacity system, high-speed data transmission speed, low latency, simultaneous connection of a large number of terminals, low cost, and low power consumption (for example, Non-Patent Document 1).

[0003] Furthermore, in Release 18 of 3GPP (registered trademark), network energy savings has become increasingly important in order to achieve environmental sustainability, carbon neutrality, SDGs (Sustainable Development Goals), reduced operating costs, etc., and methods for saving energy are being considered (e.g., Non-Patent Document 2).

[0004] 3GPP TS 38.300 V17.7.0 (2023-12)"New WID: Enhancements of network energy savings for NR", RP-234065, 3GPP TSG RAN Meeting #102, December 20233GPP TS 38.331 V17.7.0 (2023-12)3GPP TS 38.321 V17.7.0 (2023-12)3GPP TS 38.213 V17.8.0 (2023-12)3GPP TS 38.133 V17.12.0 (2023-12)

[0005] To achieve carbon neutrality and the SDGs, it is becoming increasingly important to reduce the power consumption of base stations, and the introduction of intermittent transmission and reception at base stations is being considered. To achieve an efficient energy saving (ES) state for base stations, it is necessary to introduce on-demand transmission of synchronization signals.

[0006] The present invention has been made in view of the above points, and has as its object to enable a base station capable of transitioning to a power saving state to perform on-demand transmission of a synchronization signal.

[0007] According to the disclosed technology, a terminal is provided that includes a control unit that determines a resource for receiving a DL (Downlink) transmission that triggers an on-demand SSB (SS / PBCH block) in an SCell (Secondary Cell), and a receiving unit that receives the DL transmission from a base station in the resource, wherein the receiving unit receives the SSB in the SCell from the base station, and the control unit determines the SCell.

[0008] According to the disclosed technology, a base station that can transition to a power saving state can perform on-demand transmission of a synchronization signal.

[0009] FIG. 1 is a diagram for explaining a wireless communication system according to an embodiment of the present invention. FIG. 1 is a diagram for explaining CDRX in NR Release 15. FIG. 1 is a diagram for explaining WUS in NR Release 16. FIG. 2 is a diagram for explaining discontinuous reception of a base station according to Example 1 of an embodiment of the present invention. FIG. 3 is a diagram for explaining each parameter according to Example 1 of an embodiment of the present invention. FIG. 4 is a diagram for explaining discontinuous transmission of a base station according to Example 5 of an embodiment of the present invention. FIG. 5 is a diagram for explaining each parameter according to Example 5 of an embodiment of the present invention. FIG. 6 is a diagram for explaining an example of SSB according to Example 9 of an embodiment of the present invention. FIG. 7 is a diagram for explaining an example of on-demand transmission according to Example 9 of an embodiment of the present invention. FIG. 8 is a diagram for explaining an example of the functional configuration of a base station according to an embodiment of the present invention. FIG. 9 is a diagram for explaining an example of the functional configuration of a terminal according to an embodiment of the present invention. FIG. 10 is a diagram for explaining an example of the hardware configuration of a base station or a terminal according to an embodiment of the present invention. FIG. 11 is a diagram for explaining an example of the configuration of a vehicle according to an embodiment of the present invention.

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0011] In the operation of the wireless communication system according to the embodiment of the present invention, existing technology may be used as appropriate. The existing technology is, for example, the existing NR or LTE, but is not limited to the existing NR or LTE. In addition, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and systems subsequent to LTE-Advanced (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) used in existing LTE are used. This is for convenience of description, and similar signals, functions, etc. may be called by other names. In addition, the above-mentioned terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even if a signal is used in NR, it is not necessarily stated as "NR-".

[0013] Furthermore, in the embodiment of the present invention, the duplex method may be a time division duplex (TDD) method, a frequency division duplex (FDD) method, or another method (for example, flexible duplex, etc.).

[0014] Furthermore, in the embodiments of the present invention, "configuring" radio parameters and the like may mean that predetermined values ​​are pre-configured, or that radio parameters notified from a base station or a terminal are set.

[0015] (System Configuration) Fig. 1 is a diagram for explaining a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, the wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, 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 a wireless signal are defined in the time domain and the frequency domain, and the time domain may be defined by the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. Furthermore, a transmission time interval (TTI) in the time domain may be a slot, or a subframe.

[0017] The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, via NR-PBCH and is also referred to as broadcast information. The synchronization signal and system information may also be referred to as SSB (SS / PBCH block). As shown in FIG. 1, the base station 10 transmits control signals or data to the terminal 20 via DL (Downlink) and receives control signals or data from the terminal 20 via UL (Uplink). Both the base station 10 and the terminal 20 are capable of transmitting and receiving signals by performing beamforming. Furthermore, both the base station 10 and the terminal 20 are capable of applying MIMO (Multiple Input Multiple Output) communication to the DL or UL. Furthermore, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) using CA (Carrier Aggregation). Furthermore, the terminal 20 may perform communication via a primary cell of the base station 10 and a primary secondary cell group cell (PSCell: Primary SCG Cell) of another base station 10 using DC (Dual Connectivity).

[0018] The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, or an M2M (Machine-to-Machine) communication module. As shown in FIG. 1, the terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. The terminal 20 also receives various reference signals transmitted from the base station 10 and measures propagation path quality based on the reception results of the reference signals. The terminal 20 may also be referred to as a UE, and the base station 10 may also be referred to as a gNB.

[0019] Next, the status of discussions on base station power saving in NR Release 18 will be described. Techniques for base stations and terminals to improve network energy saving from both the base station's transmission and reception perspectives are being considered. For example, methods are being considered for a base station to more efficiently realize dynamic and / or semi-static finer-granularity adaptation of transmission and / or reception using network energy saving techniques in one or more of the time, frequency, space, and power domains using potential support / feedback and potential assistance information from terminals.

[0020] Next, discontinuous reception (DRX) or connected mode DRX (CDRX) in a conventional terminal will be described.

[0021] 2 is a diagram for explaining CDRX in NR Release 15. In CDRX operation in NR Release 15, the terminal monitors the PDCCH during the DRX on period.

[0022] 3 is a diagram for explaining WUS in NR Release 16. In NR Release 16, a PDCCH-based wake-up signal (WUS: Wake Up Signal) can instruct one or more terminals whether the terminals should monitor the PDCCH within the next DRX-on period.

[0023] DCI format 2_6, in which the CRC (Cyclic Redundancy Check) is scrambled by the PS-RNTI (Power Saving - Radio Network Temporary Identifier), is used as a PDCCH-based WUS and is also called DCP (DCI with CRC scrambled by PS-RNTI).

[0024] The WUS monitoring opportunity is set by an offset from the on-duration based on the terminal capabilities. If the WUS indicates "inactive" (i.e., the terminal is not transmitting or receiving data), the terminal can skip monitoring during the on-duration and immediately transition to sleep mode. In addition, a default terminal behavior can be configured for when the PDCCH-based WUS is not detected, for example, due to a detection error.

[0025] DCI format 2_6 includes one bit of activation indication information indicating "active" or "inactive."

[0026] (Problems with the past) Next, we will explain the problems with the past. In order to achieve carbon neutrality and the SDGs, it is becoming increasingly important to reduce the power consumption of base stations. However, there has been a problem in the past in that there is no standardized method for reducing the power consumption of base stations.

[0027] (Outline 1 of the Present Embodiment) In the present embodiment, an example of achieving a reduction in power consumption of a base station from the viewpoint of the time domain will be described. Specific examples will be described below, including Examples 1 to 4.

[0028] (First embodiment) In this embodiment, the operation of a base station when it receives intermittently and the definition of related concepts will be described.

[0029] 4 is a diagram for explaining the discontinuous reception of a base station according to Example 1 of an embodiment of the present invention. The period during which the base station 10 disables / enables the receiving unit is introduced as a discontinuous reception (gNB CDRX) function by the base station (hereinafter referred to as base station discontinuous reception).

[0030] The concept of discontinuous reception for the base station 10 is similar to that of the terminal 20. The reception units and / or parameters to be disabled may be for each port, panel, beam, or carrier (or cell).

[0031] 5 is a diagram for explaining each parameter according to Example 1 of the embodiment of the present invention. The base station CDRX may be defined by a plurality of parameters listed below. The unit of the parameters may be a symbol, a slot, a subframe, a millisecond, a second, or the like. The unit may be different or the same for each parameter. drx-onDurationTimer: the period at the start of the DRX cycle; drx-SlotOffset: the delay before starting the drx-onDurationTimer; drx-InactivityTimer: the period during which the terminal 20 performs uplink transmission after an uplink reception opportunity; drx-LongCycleStartOffset: the long DRX cycle (i.e., drx-LongCycle) and drx-StartOffset, which define when the long and short DRX cycles start; drx-ShortCycle: the short DRX cycle; drx-ShortCycleTimer: the period during which the base station 10 follows the short DRX cycle. drx-RetransmissionTimerUL: maximum period until a grant for an uplink retransmission is received; drx-HARQ-RTT-TimerUL: minimum period until a grant for an uplink retransmission is expected.

[0032] When base station discontinuous reception is enabled, the base station 10 may receive an uplink channel transmitted from the terminal 20 when drx-onDurationTimer, drx-InactivityTimer, or drx-RetransmissionTimerUL is executed.

[0033] If discontinuous base station reception is enabled, the terminal 20 may act in one of the following options.

[0034] <Option 1> The terminal 20 may operate assuming discontinuous reception at the base station. Specifically, the terminal 20 identifies the status of discontinuous reception at the base station by RRC, MAC-CE, or DCI. In the case of DCI, it is assumed that the terminal 20 receives DCI indicating the status of discontinuous reception at the base station from the base station 10. Details of the instruction by DCI will be described later in Example 3.

[0035] When the base station discontinuous reception is enabled, the terminal 20 may transmit an uplink channel while the drx-onDurationTimer, the drx-InactivityTimer, or the drx-RetransmissionTimerUL is running.

[0036] Option 2: The terminal 20 may ignore the DBR, specifically, the terminal 20 performs uplink transmissions as scheduled or configured by the base station 10, regardless of the DBR status.

[0037] Note that when discontinuous base station reception is enabled, the base station 10 may perform scheduling or settings that take discontinuous base station reception into consideration, or may perform scheduling or settings regardless of discontinuous base station reception. When scheduling or settings that take discontinuous base station reception into consideration are performed, the discontinuous base station reception function is realized even if the terminal 20 ignores discontinuous base station reception. Conversely, when scheduling or settings that take discontinuous base station reception into consideration are not performed, if the terminal 20 ignores discontinuous base station reception, unnecessary signal transmission occurs, resulting in wasted power consumption by the terminal 20.

[0038] On the other hand, if the base station discontinuous reception is disabled, the base station 10 may receive the uplink channel transmitted from the terminal 20 regardless of the base station discontinuous reception parameter, i.e., the base station 10 may keep the receiving unit turned on and continuously receive the uplink channel from the terminal 20.

[0039] If discontinuous base station reception is disabled, the terminal 20 may act in one of the following options.

[0040] <Option 1> The terminal 20 may operate assuming discontinuous reception at the base station. Specifically, the terminal 20 identifies the status of discontinuous reception at the base station by RRC, MAC-CE, or DCI. In the case of DCI, it is assumed that the terminal 20 receives DCI indicating the status of discontinuous reception at the base station from the base station 10. Details of the instruction by DCI will be described later in Example 3.

[0041] If discontinuous base station reception is disabled, the terminal 20 performs uplink transmissions as scheduled or configured by the base station 10 regardless of the status of discontinuous base station reception.

[0042] Option 2: The terminal 20 may ignore the DBR, specifically, the terminal 20 performs uplink transmissions as scheduled or configured by the base station 10, regardless of the DBR status.

[0043] The base station 10 may also receive terminal assistance information in order to determine the values ​​of the aforementioned parameters that define the wake-up / sleep periods.

[0044] The terminal assistance information may be a period of terminal traffic. The base station 10 may receive the terminal assistance information at a higher layer. The base station 10 determines the value of the parameter by taking into account the terminal assistance information reported by the terminal 20.

[0045] The terminal 20 may transmit terminal assistance information such as the period of terminal traffic to the base station 10 .

[0046] According to this embodiment, the base station 10 can achieve discontinuous reception.

[0047] (Embodiment 2) In this embodiment, an example of a method for triggering discontinuous reception at a base station is shown.

[0048] Enabling / disabling the base station discontinuous reception may be done by one of the following options:

[0049] <Option 1> The base station 10 may enable / disable the discontinuous reception at the base station when an RRC parameter indicating the enable / disable of the discontinuous reception at the base station is set by the terminal 20 or another network node (e.g., a core network, another base station, etc.).

[0050] <Option 2> The base station 10 may enable / disable the base station discontinuous reception when it receives a MAC-CE command indicating the enable / disable of the base station discontinuous reception from the terminal 20 or another network node (e.g., a core network or another base station).

[0051] <Option 3> When the base station 10 receives UCI included in the PUCCH or PUSCH from the terminal 20, the base station 10 may enable / disable the base station discontinuous reception based on an instruction to enable / disable the base station discontinuous reception included in the UCI.

[0052] The UCI including the instruction to enable / disable the base station discontinuous reception may be a UCI of a newly defined UCI type different from the conventional UCI. Also, the UCI may be a UCI of the same type as the conventional UCI, such as HARQ-ACK, CSI, or SR.

[0053] The terminal 20 may transmit a PUCCH or PUSCH to the base station 10 to carry out an instruction (i.e., activation / deactivation) of discontinuous reception at the base station, thereby enabling / disabling discontinuous reception at the base station.

[0054] The terminal 20 may receive DCI indicating the status of the discontinuous reception at the base station from the base station 10, in order to determine whether the instruction by the UCI has been successfully decoded by the base station 10 and whether there is a common understanding of the status of the discontinuous reception at the base station between the base station 10 and the terminal 20. Details of the DCI will be described later in Example 3.

[0055] <Option 4> The base station 10 may enable / disable the base station discontinuous reception when certain conditions are met. For example, the base station 10 may enable the base station discontinuous reception when it does not receive an uplink channel from the terminal 20 for a certain period of time. The certain period of time may be a symbol, a slot, a subframe, a millisecond, a second, or the like.

[0056] The terminal 20 may receive DCI indicating the status of discontinuous reception at the base station from the base station 10 in order to obtain a common understanding of the status of discontinuous reception at the base station between the base station 10 and the terminal 20. Details of the DCI will be described later in Example 3.

[0057] <Option 5> The base station 10 may enable / disable the base station discontinuous reception by a combination of the above options.

[0058] Furthermore, the base station 10 may perform one of the following optional operations as a procedure for enabling / disabling the base station discontinuous reception.

[0059] <Option 1> The base station 10 may immediately enable / disable the discontinuous reception at the base station when any of the above-described options that trigger the enablement / disablement of the discontinuous reception at the base station is executed.

[0060] <Option 2> The base station 10 may receive an instruction on the timing of enabling / disabling the discontinuous reception at the base station at a fixed time interval after receiving the instruction, or at a specified time. The time interval or time may be specified in units of symbols, slots, subframes, milliseconds, seconds, etc. In other words, the base station 10 may enable / disable the discontinuous reception at the base station at a specified time when one of the above-mentioned options that triggers the enabling / disabling of the discontinuous reception at the base station is executed.

[0061] <Option 3> The base station 10 may enable / disable the base station discontinuous reception based on a newly introduced timer. The enable / disable timers may be the same or different. The timer unit may be symbols, slots, subframes, milliseconds, seconds, etc. The base station 10, the terminal 20, or another network node may configure the timer in RRC or specify it in MAC-CE or UCI / DCI.

[0062] That is, when any of the options that trigger the enabling / disabling of the discontinuous base station reception described above is executed, the timer is executed, and when the timer expires, the base station 10 may enable / disable the discontinuous base station reception.

[0063] The advantages of the timer are as follows: Even if the base station discontinuous reception is instructed to be enabled, there are cases where actual uplink transmission from the terminal 20 occurs with a certain delay after the instruction due to processing by the terminal 20, etc. Even in such cases, by introducing a timer, the base station discontinuous reception can be enabled after a certain time, thereby reducing the power consumption of the base station 10.

[0064] Furthermore, even if the discontinuous reception from the base station is instructed to be disabled, actual uplink transmission from the terminal 20 may continue to occur for a while after the instruction due to processing by the terminal 20. Even in such cases, by introducing a timer, the discontinuous reception from the base station can be disabled after a certain period of time, thereby improving the performance of the terminal 20.

[0065] According to this embodiment, it is possible to realize a trigger for base station discontinuous reception, and also to realize an operation for enabling / disabling the reception when the trigger is established.

[0066] Third Embodiment In this embodiment, an example will be described in which a terminal receives an instruction regarding discontinuous reception at a base station by DCI.

[0067] If the terminal 20 identifies the status of discontinuous reception at the base station and the terminal 20 and the base station 10 have a common understanding of the status, it is necessary to consider a mechanism for indicating the status of discontinuous reception at the base station from the base station 10 to the terminal 20. For timely indication, indication by DCI is promising.

[0068] It should be noted that the advantage of having a common understanding is that when base station discontinuous reception is enabled, the terminal 20 can stop uplink transmission, thereby saving power consumption of the terminal 20.

[0069] A new RNTI may be introduced to indicate the status of the base station discontinuous reception. The new RNTI may be, for example, the gNB CDRX-RNTI (GC-RNTI).

[0070] Also, the introduction of the DCI field may be one of the following options:

[0071] <Option 1> A new DCI field may be introduced to indicate the status of the base station discontinuous reception. The bit size of the introduced DCI field may be 1 bit, with a valid state indicated by "1" and an invalid state indicated by "0". The reverse may also be possible.

[0072] <Option 2> A new DCI field does not need to be introduced. That is, the status of the base station discontinuous reception may be indicated by an existing field. For example, if the corresponding DCI format is scrambled with a new RNTI such as a GC-RNTI and the HPN and RV fields are all set to "0", the terminal 20 may identify that the status of the base station discontinuous reception is enabled.

[0073] Also, for example, if the corresponding DCI format is scrambled with a new RNTI such as a GC-RNTI, the HPN and RV fields are all set to "0", and the MCS field is all set to "1", the terminal 20 may identify that the status of base station discontinuous reception is disabled.

[0074] Also, the corresponding DCI format may be one of the following options:

[0075] <Option 1> The DCI may be unique to the terminal 20.

[0076] <Option 1-1> The base station 10 may indicate the status of base station discontinuous reception using a new DCI format that is different from the conventional format.

[0077] <Option 1-2> The base station 10 may indicate the status of base station discontinuous reception using conventional DCI formats 0_1, 0_2, 1_1, 1_2 or other DCI formats.

[0078] <Option 2> The DCI may be common to the group of terminals 20.

[0079] <Option 2-1> The base station 10 may indicate the status of the base station discontinuous reception using a new DCI format different from the conventional one. The above-mentioned new DCI field may be introduced in the new DCI format together with other new DCI fields for the power saving technology of the base station 10. The base station 10 may scramble the new DCI format with the above-mentioned new RNTI (e.g., GC-RNTI).

[0080] <Option 2-2> The base station 10 may indicate the status of base station discontinuous reception using the conventional DCI format 2_6 or another group-common DCI format.

[0081] Assuming that DCI format 2_6 is used, the conventional DCI fields of the DCI format may be reinterpreted to indicate the status of the base station discontinuous reception. For example, the "wake-up indication" may be reinterpreted. A valid state may be indicated by "1" and an invalid state by "0", or vice versa.

[0082] For differentiation, the base station 10 may scramble the DCI format 2_6 with the new RNTI (such as GC-RNTI) described above instead of the PS-RNTI.

[0083] According to this embodiment, the terminal 20 can identify the status of the base station discontinuous reception, and the terminal 20 and the base station 10 can understand it in common.

[0084] Fourth Embodiment In this embodiment, an example will be described in which base stations and terminals mutually report capability information relating to base station discontinuous reception.

[0085] The following capability information may be introduced:

[0086] Base station capability information indicating the capabilities of the base station 10 may be introduced. That is, the base station 10 transmits the base station capability information to the terminal 20 or other network nodes. The terminal 20 or other network nodes that receive the base station capability information may assume the capabilities of the base station 10 based on the received base station capability information.

[0087] The base station capability information may include information indicating whether the base station supports discontinuous reception. Also, the base station capability information may be introduced to indicate whether a DCI indication indicating the status of discontinuous reception is supported.

[0088] The following terminal capability information may also be introduced. For example, terminal capability information indicating whether or not the base station discontinuous reception is supported may be introduced. Furthermore, terminal capability information indicating whether or not the base station discontinuous reception status identification may be introduced.

[0089] When the terminal 20 has a terminal capability that supports identifying the status of the discontinuous reception from the base station, the terminal 20 may identify whether the discontinuous reception from the base station function is enabled or disabled. For example, the terminal 20 may perform the operation of Option 1 described in the first embodiment. Furthermore, when the terminal 20 does not have a terminal capability that supports identifying the status of the discontinuous reception from the base station, the terminal 20 may perform the operation of Option 2 described in the first embodiment.

[0090] In addition, terminal capability information indicating whether or not a DCI indication indicating the status of discontinuous reception at a base station is supported may be introduced. In addition, terminal capability information indicating whether or not a new terminal-specific / group-common DCI format is supported may be introduced.

[0091] The dependency between the base station capability information and the terminal capability information may be one of the following options:

[0092] <Option 1> To apply the base station discontinuous reception, it may be necessary to report both the base station capability information and the terminal capability information indicating that the base station discontinuous reception is supported.

[0093] <Option 2> To apply the base station discontinuous reception, it may be sufficient to report only either the base station capability information or the terminal capability information indicating that the base station discontinuous reception is supported.

[0094] According to this embodiment, the base station and the terminal can mutually report capability information regarding the base station discontinuous reception.

[0095] The terminal capabilities in the above-described embodiments may be limited to cases where the terminal 20 is a reduced-function terminal, or may be applied to cases where the terminal 20 is not a reduced-function terminal.

[0096] (Outline 2 of the present embodiment) Furthermore, cell DTX / DRX is being considered to reduce power consumption in the base station 10. For example, alignment of cell DTX / DRX with UE-DRX in RRC connected mode, information exchange between nodes regarding cell DTX / DRX, etc. are being considered. Note that cell DTX / DRX may be replaced with cell DTX and cell DRX, or may be replaced with cell DTX or cell DRX.

[0097] The mechanism for enabling or disabling the transceiver units of the base station 10 is important to reduce the power consumption in the base station 10. To reduce the power consumption in the base station 10, adaptation of DL transmission and UL reception has been considered.

[0098] Cell DTX / DRX is useful for achieving adaptation of DL transmission and UL reception. However, the details of the operation of cell DTX / DRX have not been clear. Therefore, hereinafter, examples 5 to 8 will be described as specific examples of cell DTX / DRX.

[0099] (Example 5) In Example 5, a definition of cell DTX / DRX will be described. Cell DRX may be defined as in Examples 1 to 4 above. Whether cell DRX is performed is determined by higher layer parameters, and a period, a start slot, an offset, and a duration may be set. Furthermore, whether cell DRX is applicable may be determined based on a semi-static, dynamic, or flexible network state.

[0100] Cell DTX may be defined as described below. Whether cell DTX is performed is determined by higher layer parameters, and the period, start slot, offset, and duration may be configured. Furthermore, whether cell DTX is applicable may be determined by semi-static, dynamic, or flexible network conditions.

[0101] <Option 1> Fig. 6 is a diagram for explaining discontinuous transmission of a base station according to Example 5 of an embodiment of the present invention. As shown in Fig. 6, a period during which the base station 10 disables or enables its own transmission unit may be introduced as cell DTX.

[0102] The transmission units and / or parameters to be disabled may be per port, per panel, per beam, per carrier, or per cell. Cell DTX may be defined by some or all of the parameters listed in 1)-6) below. The units of the parameters may be symbols, slots, subframes, milliseconds, seconds, etc., or other units. The units of the parameters may be the same or different.

[0103] 1) dtx-onDurationTimer: A period from the beginning of the DTX cycle. 2) dtx-SlotOffset: A delay period before starting dtx-onDurationTimer. 3) dtx-InactivityTimer: A period that starts after a DL transmission opportunity (an opportunity for the base station 10 to perform DL transmission and for the terminal 20 to receive DL transmission). 4) dtx-LongCycleStartOffset: dtx-StartOffset that defines the long DTX cycle (i.e., dtx-LongCycle) and the start of the long and short DTX cycles. 5) dtx-ShortCycle: A short DTX cycle. This may be optional. 6) dtx-ShortCycleTimer: A period during which the base station 10 performs a short DTX cycle. When DL reception occurs during long DTX, short DTX is started. This may be optional.

[0104] 7 is a diagram for explaining each parameter according to Example 5 of an embodiment of the present invention. As shown in FIG. 7, from the beginning of dtx-LongCycle, the active time is dtx-onDurationTimer after dtx-SlotOffset. If DL reception occurs during drx-LonCycle, the active time ends after dtx-InactivityTimer from the point at which DL reception occurred, and dtx-ShortCycle starts. If DL reception occurs during dtx-ShortCycleTimer, dtx-ShortCycle continues. If DL reception does not occur during dtx-ShortCycleTimer, dtx-LongCycle starts.

[0105] When cell DTX is enabled, the base station 10 may transmit a DL channel or a DL signal while the dtx-onDurationTimer or the dtx-InactivityTimer is running. As an operation of the terminal 20, when cell DTX is enabled, the terminal 20 may receive a DL channel or a DL signal while the dtx-onDurationTimer or the dtx-InactivityTimer is running. The terminal 20 may assume that it receives a DL channel or a DL signal when the dtx-onDurationTimer or the dtx-InactivityTimer is not running.

[0106] When cell DTX is disabled, the terminal 20 may assume that it receives DL channels or DL ​​signals as notified or configured by the base station 10 .

[0107] The DL channel or DL ​​signal may be any of PDCCH, PDSCH, SPS (Semi Persistent Scheduling)-PDSCH, CSI-RS (Channel State Information - Reference Signal), PT-RS (Phase Tracking - Reference Signal), and DM-RS (Demodulation - Reference Signal).

[0108] The UL channel or UL signal may be any of PRACH, PUCCH, PUSCH, CG-PUSCH, SRS, PT-RS, and DM-RS.

[0109] Sixth Embodiment In a sixth embodiment, the setting of cell DTX / DRX will be described.

[0110] <Option 1> Joint configuration may be performed. Cell DTX and cell DRX may be jointly configured using common parameters. When the common parameters (e.g., CellDTXDRX-Config) are configured, cell DTX and DRX may be enabled. The terminal 20 may appropriately perform the operation of Example 5.

[0111] The common parameters may include either or both of the information elements 1) and 2) shown below.

[0112] 1) Parameters common to DTX and DRX. Some parameters may be common to DTX and DRX. For example, a parameter indicating an on-duration timer may be common to DTX and DRX. For example, a parameter indicating a cycle may be common to DTX and DRX.

[0113] 2) Parameters Separated for DTX and DRX: Some parameters may be set separately for DTX and DRX. For example, a parameter indicating a slot offset may be set separately for DTX and DRX.

[0114] Option 1 allows for a reduction in RRC signaling overhead.

[0115] <Option 2> Separate configurations may be performed. Cell DTX and cell DRX may be configured individually using separate parameters. When a parameter for DTX (e.g., CellDTX-Config) is configured, cell DTX may be enabled. When a parameter for DRX (e.g., CellDRX-Config) is configured, cell DRX may be enabled. The parameters for DTX may include the parameters described in Example 5. The parameters for DRX may include the parameters described in Example 1.

[0116] Option 2 provides more flexibility in configuration when enabling either cell DTX or cell DRX.

[0117] Example 7 In Example 7, enabling or disabling of cell DTX / DRX is described. When cell DTX and cell DRX are jointly configured (option 1 in Example 6), cell DTX and cell DRX may be enabled or disabled as follows:

[0118] <Option 1> Cell DTX and cell DRX may be enabled or disabled by RRC signaling. When an RRC parameter is configured, cell DTX and cell DRX may be enabled or disabled. For example, the RRC parameter may be the common parameter (e.g., CellDTXDRX-Config) in Example 6.

[0119] <Option 2> Cell DTX and cell DRX may be enabled or disabled by MAC-CE When the terminal 20 receives MAC-CE, cell DTX and cell DRX may be enabled or disabled.

[0120] <Option 3> Cell DTX and cell DRX may be enabled or disabled by DCI. The terminal 20 may be dynamically notified by DCI that cell DTX and cell DRX have been enabled or disabled. The notification by DCI may be performed as shown in 1) to 4) below.

[0121] 1) The DCI format may be a UE-specific DCI format or a group-common DCI format.

[0122] 2) The DCI format may be an existing format (e.g., DCI formats 1_1, 1_2, 2_0) or may be newly defined (e.g., 1_x, 2_x).

[0123] 3) The RNTI may be an existing RNTI (e.g., C-RNTI, SFI-RNTI), or a new RNTI may be defined.

[0124] 4) The DCI fields may be a set of existing fields and / or a new set of fields. For example, if it is a set of existing fields, some fields may be used to enable or disable cell DTX and cell DRX, as shown in Alt. 1) and Alt. 2) below.

[0125] Alt. 1) When scrambling is performed by an existing RNTI such as a CS-RNTI, and for example, when HPN is set to all "0", RV is set to all "00", and TDRA is set to all "1", the terminal 20 may dynamically enable cell DTX and cell DRX. Also, for example, when HPN is set to all "0", RV is set to all "00", MCS is set to all "1", FDRA is set to all "1", and TDRA is set to all "1", the terminal 20 may dynamically disable cell DTX and cell DRX.

[0126] Alt. 2) When scrambling with a new RNTI and, for example, when HPN is set to all "0"s and RV is set to all "00", the terminal 20 may dynamically enable cell DTX and cell DRX. Also, when, for example, HPN is set to all "0", RV is set to all "00", MCS is set to all "1", and FDRA is set to all "1", the terminal 20 may dynamically disable cell DTX and cell DRX.

[0127] For example, in the case of a new DCI field, cell DTX and cell DRX may be enabled or disabled by the new DCI field. The new DCI field may be referred to as a "cell DTX DRX identifier." For example, if the cell DTX DRX identifier is set to "1," the terminal 20 may dynamically enable cell DTX and cell DRX. Also, for example, if the cell DTX DRX identifier is set to "0," the terminal 20 may dynamically disable cell DTX and cell DRX. Note that the DCI including the new DCI field may be scrambled with either an existing RNTI or a new RNTI.

[0128] Also, when cell DTX and cell DRX are configured separately (option 2 in Example 6), cell DTX and cell DRX may be enabled or disabled as follows.

[0129] <Option 1> Cell DTX or cell DRX may be enabled or disabled by RRC signaling. When an RRC parameter is configured, cell DTX or cell DRX may be enabled or disabled. For example, the RRC parameter may be the separate parameter (e.g., CellDTX-Config, CellDRX-Config) in Example 6.

[0130] <Option 2> Cell DTX or cell DRX may be enabled or disabled by MAC-CE When the terminal 20 receives MAC-CE, cell DTX or cell DRX may be enabled or disabled.

[0131] <Option 3> The terminal 20 may be dynamically notified by a DCI that cell DTX or cell DRX has been enabled or disabled. The notification by the DCI may be performed as shown in 1) to 4) below.

[0132] 1) The DCI format may be a UE-specific DCI format or a group-common DCI format.

[0133] 2) The DCI format may be an existing format (e.g., DCI formats 1_1, 1_2, 2_0) or may be newly defined (e.g., 1_x, 2_x).

[0134] 3) The RNTI may be an existing RNTI (e.g., C-RNTI, SFI-RNTI), or a new RNTI may be defined.

[0135] 4) The DCI fields may be a set of existing fields and / or a new set of fields. For example, a different set of DCI fields may be used to enable or disable cell DTX or cell DRX, respectively, to indicate either cell DTX or cell DRX. For example, in the case of an existing set of fields, some fields may be used to enable or disable cell DTX and cell DRX, as shown in Alt. 1) and Alt. 2) below.

[0136] Alt. 1) When scrambling is performed by an existing RNTI such as a CS-RNTI, and, for example, when the HPN is set to all "0", the RV is set to all "00", and the PRI is set to all "1", the terminal 20 may dynamically enable cell DTX. Also, for example, when the HPN is set to all "0", the RV is set to all "00", the MCS is set to all "1", the FDRA is set to all "1", and the PRI is set to all "1", the terminal 20 may dynamically disable cell DTX. Also, for example, when the HPN is set to all "0", the RV is set to all "00", and the TDRA is set to all "1", the terminal 20 may dynamically enable cell DRX. Also, for example, when the HPN is set to all "0", the RV is set to all "00", the MCS is set to all "1", the FDRA is set to all "1", and the TDRA is set to all "1", the terminal 20 may dynamically disable cell DRX.

[0137] In addition, the PRI and TDRA fields may additionally be used to indicate whether the DCI to be enabled or disabled is for CG-PUSCH / SPS-PDSCH or cell DTX / cell DRX.

[0138] Note that the same fields as those used above, such as PRI and TDRA (e.g., TDRA), may be used to indicate whether the target is CG-PUSCH / SPS-PDSCH or cell DTX / cell DRX. When different DCI formats are used, the DCI format may indicate whether the target is cell DTX or cell DRX. For example, DCI format 0_0 may enable or disable cell DRX, and DCI format 1_0 may enable or disable cell DTX.

[0139] Alt. 2) When scrambling with a new RNTI, for example, when the HPN is set to all "0", the RV is set to all "00", and the PRI is set to all "1", the terminal 20 may dynamically enable cell DTX. For example, when the HPN is set to all "0", the RV is set to all "00", the MCS is set to all "1", the FDRA is set to all "1", and the PRI is set to all "1", the terminal 20 may dynamically disable cell DTX. For example, when the HPN is set to all "0" and the RV is set to all "00", the terminal 20 may dynamically enable cell DRX. For example, when the HPN is set to all "0", the RV is set to all "00", the MCS is set to all "1", and the FDRA is set to all "1", the terminal 20 may dynamically disable cell DRX.

[0140] Note that, for example, although PRI is used as described above, an additional field may not be used to indicate whether cell DTX or cell DRX is targeted. When different DCI formats are used, the DCI format may signal whether cell DTX or cell DRX is targeted. For example, DCI format 0_0 may enable or disable cell DRX, and DCI format 1_0 may enable or disable cell DTX.

[0141] For example, in the case of a new DCI field, the new DCI field may enable or disable cell DTX or cell DRX, and the new DCI field may be called a "Cell DTX identifier" or a "Cell DRX identifier."

[0142] When the cell DTX and the cell DRX are notified separately in separate fields, for example, if the cell DTX identifier is set to "1", the terminal 20 may dynamically enable the cell DTX. Also, for example, if the cell DTX identifier is set to "0", the terminal 20 may dynamically disable the cell DTX. For example, if the cell DRX identifier is set to "1", the terminal 20 may dynamically enable the cell DRX. Also, for example, if the cell DRX identifier is set to "0", the terminal 20 may dynamically disable the cell DRX.

[0143] Furthermore, this new DCI field may be referred to as a "cell DTX DRX identifier." When cell DTX and cell DRX are jointly notified in a common field, for example, if the cell DTX DRX identifier is set to "01," the terminal 20 may dynamically enable cell DTX or dynamically disable cell DRX. For example, if the cell DTX DRX identifier is set to "10," the terminal 20 may dynamically enable cell DRX or dynamically disable cell DTX. For example, if the cell DTX DRX identifier is set to "11," the terminal 20 may dynamically enable cell DTX and cell DRX. For example, if the cell DTX DRX identifier is set to "00," the terminal 20 may dynamically enable cell DTX and cell DRX. The bit mapping of cell DTX and cell DRX described above may be reversed.

[0144] It should be noted that the DCI including the new DCI field may be scrambled with either the existing RNTI or the new RNTI.

[0145] The timing for applying the enabling or disabling of cell DTX or cell DRX notified by MAC-CE or DCI described above may be 1) or 2) shown below.

[0146] 1) The terminal 20 may immediately activate or deactivate the cell DTX or cell DRX. When activation or deactivation of the cell DTX or cell DRX is notified by MAC-CE or DCI, the terminal 20 may immediately activate or deactivate the cell DTX or cell DRX.

[0147] 2) The terminal 20 may activate or deactivate the cell DTX or cell DRX at the notified time. The time to activate or deactivate the cell DTX or cell DRX may be notified via RRC signaling, MAC-CE, or DCI as an interval or a certain time from the time when the activation or deactivation is notified. The unit of time may be a symbol, a slot, a subframe, a millisecond, a second, or the like. When the activation or deactivation of the cell DTX or cell DRX is notified by MAC-CE or DCI, the terminal 20 may activate or deactivate the cell DTX or cell DRX at the notified time in advance.

[0148] Example 8 In Example 8, a related operation between cell DTX / DRX and UE DRX will be described. If the time positions of cell DTX and UE DRX are not aligned, the terminal 20 may wake up to receive a DL channel or DL ​​signal when no DL transmission is being performed due to cell DTX.

[0149] Therefore, it may operate as shown in Option 1 to Option 5 below.

[0150] <Option 1> When UE DRX is configured (for example, DRX-Config), the terminal 20 does not have to assume that cell DTX is configured.

[0151] <Option 2> When cell DTX is configured, the terminal 20 does not need to assume that UE DRX (e.g., DRX-Config) is configured. Note that the parameters of cell DTX may be the parameters described in Example 6.

[0152] <Option 3> When UE DRX is configured (e.g., DRX-Config), the terminal 20 does not need to assume that cell DTX, whose time position does not match that of the UE DRX, is configured. If the time positions of the cell DTX and the UE DRX are aligned, the cell DTX and the UE DRX may be configured jointly.

[0153] <Option 4> When cell DTX is configured, the terminal 20 does not need to assume that UE DRX (e.g., DRX-Config) that is not time-aligned with the cell DTX is configured. If the cell DTX and UE DRX are time-aligned, the cell DTX and UE DRX may be configured jointly.

[0154] <Option 5> Cell DTX and UE DRX may be configured in the terminal 20 regardless of whether the time positions of the cell DTX and the UE DRX are aligned or not. Furthermore, when the cell DTX is configured in addition to the UE DRX, the parameters of the cell DTX may take priority. The terminal 20 may ignore the parameters of the UE DRX. The terminal 20 may operate as in Example 5. Furthermore, when the cell DTX is configured in addition to the UE DRX, both parameters may be applied. The terminal 20 may wake up during the active times of both the cell DTX and the cell DRX.

[0155] The above "cell DTX and UE DRX are time aligned" may be defined as option 1 or option 2 shown below.

[0156] <Option 1> If the long cycle is the same for cell DTX and UE DRX, the cell DTX and UE DRX may be defined as being aligned in time.

[0157] <Option 1-1> Furthermore, when the long cycle is the same for cell DTX and UE DRX, it may be defined that the time positions of cell DTX and UE DRX are aligned regardless of the active time within the long cycle. In other words, when the long cycle of cell DTX (e.g., dtx-LongCycle) and the long cycle of UE DRX (e.g., drx-LongCycle) are the same, it may be defined that the time positions are aligned.

[0158] <Option 1-2> If the long cycle is the same for the cell DTX and the UE DRX, the cell DTX and the UE DRX may be further defined as being time-aligned depending on the active time within the long cycle. If the on-duration timers and slot offsets in the long cycle (e.g., dtx-LongCycle, drx-LongCycle, dtx-onDurationTimer, drx-onDurationTimer, dtx-SlotOffset, drx-SlotOffset) are the same for the cell DTX and the UE DRX, the cell DTX and the UE DRX may be defined as being time-aligned. Furthermore, other parameters (e.g., dtx-InactivityTimer, drx-InactivityTimer, etc.) may be additionally considered to determine whether this definition is met.

[0159] <Option 2> In addition to the long cycle, if the short cycle is the same for the cell DTX and the UE DRX, it may be defined that the cell DTX and the UE DRX are time-aligned. Option 2 may be applied when the conditions of Option 1-1 or Option 1-2 are met.

[0160] <Option 2-1> Furthermore, when the short cycle is the same for cell DTX and UE DRX, the time positions of cell DTX and UE DRX may be defined as being aligned regardless of the active time within the short cycle. In other words, when the short cycle of cell DTX (e.g., dtx-ShortCycle) and the short cycle of UE DRX (e.g., drx-ShortCycle) are the same, the time positions may be defined as being aligned.

[0161] <Option 2-2> If the short cycle is the same for cell DTX and UE DRX, the cell DTX and UE DRX may be defined as being time-aligned depending on the active time within the short cycle. If the short cycle timers and short cycles (e.g., dtx-ShortCycleTimer, drx-ShortCycleTimer, dtx-ShortCycle, drx-ShortCycle) are the same for cell DTX and UE DRX, the cell DTX and UE DRX may be defined as being time-aligned.

[0162] (Outline 3 of the present embodiment) (Example 9) To achieve network energy savings (NES), support for on-demand SSB transmission in an SCell is being considered for a UE in connected mode configured for carrier aggregation. The on-demand SSB transmission is used by the UE for at least time and frequency synchronization of the SCell, L1 and L3 measurements, and SCell activation.

[0163] The addition and release of SCells is supported, for example, in Non-Patent Document 3. When a predetermined information element is set in a higher layer, the SCell is set to be in an activated state in a lower layer.

[0164] Activation and deactivation of SCells are supported, for example, in Non-Patent Document 4 and Non-Patent Document 5. When an SCell is activated by MAC-CE, SRS (Sounding Reference Signal) transmission, CSI reporting, PDCCH monitoring, and PUCCH transmission may be performed in the SCell. In addition, a timeline is specified from the reception of an activation command to the execution of activation.

[0165] For example, if an SCell activation command is received in slot n, the transmission of a valid CSI report for the activated SCell is scheduled for slot n+T. ＨＡＲＱ +Tａｃｔｉｖａｔｉｏｎ＿ｔｉｍｅ +T ＣＳＩ＿Ｒｅｐｏｒｔｉｎｇ This is carried out by (see Non-Patent Document 6).

[0166] T ａｃｔｉｖａｔｉｏｎ＿ｔｉｍｅ The value of varies depending on the conditions of the SCell. For example, it may be any of the values ​​shown in 1)-5) below. Note that, regarding SMTC (SSB based RRM Measurement Timing Configuration window), T ＳＭＴＣ＿ＭＡＸ is T ＳＭＴＣ＿ＳＣｅｌｌ It is defined as shown in Table 1.

[0167]

[0168] 1) If the SCell is in FR1 and has been previously measured (known cell), T ＳＭＴＣ＿ＳＣｅｌｌ +5ms (if MeasCycleSCell is 160ms or less), or T ＳＭＴＣ＿ＭＡＸ +T ＳＭＴＣ＿ＳＣｅｌｌ +5 ms (when MeasCycleSCell is 160 ms or more). The 5 ms may be broken down into 3 ms for MAC decoding and 2 ms for margin.

[0169] 2) If the SCell is in FR1 and is an unknown cell, 2×T ＳＭＴＣ＿ＭＡＸ +2 x T ＳＭＴＣ＿ＳＣｅｌｌ +5ms.

[0170] 3) If the SCell is in FR2 and there is one or more active cells in the same band, T ＳＭＴＣ＿ＳＣｅｌｌ +5ms.

[0171] 4) If the SCell is in FR2, there is no active cell in the same band, but it is a known cell, and if SCell activation and TCI (Transmission Configuration Indication) state activation are received simultaneously, T ＭＡＣ－ＣＥ，ＳＣｅｌｌ +T ＦｉｎｅＴｉｍｉｎｇ If the SCell is in FR2, there is no active cell in the same band, but it is a known cell, and if the TCI state activation is received after the SCell activation, max{T ＭＡＣ－ＣＥ，ＳＣｅｌｌ , Tｕｎｃｅｒｔａｉｎｔｙ} + T ＭＡＣ－ＣＥ＿ＴＣＩ +T ＦｉｎｅＴｉｍｉｎｇ +2ms.

[0172] 5) If the SCell is in FR2 and is an unknown cell, T ＭＡＣ－ＣＥ，ＳＣｅｌｌ +24 x T ＳＭＴＣ＿ＳＣｅｌｌ +T Ｌ１－ＲＳＲＰ，ｍｅａｓｕｒｅ +T ｕｎｃｅｒｔａｉｎｔｙ +T ＭＡＣ－ＣＥ＿ＴＣＩ +T ＦｉｎｅＴｉｍｉｎｇ +TCSI-RS_resource_configuration+2ms.

[0173] The definition of a known cell is as follows: If the conditions are met, the time until activation is completed can be shortened, for example, by skipping SSB detection of the target cell.

[0174] In FR1, if a valid measurement report has been sent within max {measCycleSCell, DRX cycles} immediately before receiving the SCell activation command, and the SSB used during the measurement is still detectable. In the case of a known cell, only AGC setting (Auto gain control) is required, and PSS / SSS detection and SSB index acquisition are not required.

[0175] In FR2, if a valid L3-RSRP measurement report is sent at beam level within 4 seconds (power class 1) or 3 seconds (power classes 2-4) immediately prior to receiving the SCell activation command, the SCell activation command is received after the measurement report but before TCI activation, and the SSB used at the time of the measurement is still detectable.

[0176] FIG. 8 is a diagram showing an example of SSB according to Example 9 of the present invention. Compared to LTE, SSB in NR has a wider bandwidth and a reduced number of symbols, from 6 RBs with 6 symbols to 20 RBs with 4 symbols. Furthermore, flexibility has been improved, allowing for longer periods to be set, such as {5, 10, 20, 40, 80, 160} ms. Multiple candidate symbol positions can be set within a 5 ms half radio frame. For example, 4 can be set in the 0-3 GHz band, 8 in the 3-6 GHz band, and 64 in the 6-52.6 GHz band.

[0177] Transmit beam sweeping is possible for SSB transmissions, as shown in Figure 8. The same cell ID is used across SSBs, but the SSB index is distinct. The SSB index determines the time domain position within a 5 ms half radio frame.

[0178] For example, SSB-less SCell operation may be performed in the FR1 intraband. When performed in the FR1 interband, the SSB-less SCell may be quasi-collocated with the reference cell, and a Tracking RS (TRS) or A-TRS may be configured. The RTD may be shorter than the CP length converted into an SCS of the SSB-less SCell. The power difference between the TRS or A-TRS of the SSB-less SCell and the SSB of the reference cell may be equal to or less than a predetermined value. The RS of the SSB-less SCell may be a TRS or A-TRS and a QCL-A, and the TRS or A-TRS may be the SSB of the reference cell and a QCL-C.

[0179] Regarding SSB transmission in the SCell, if it is not necessary, the SSB may not be transmitted, and if necessary, only SSB with the minimum required characteristics (period, location, etc.) may be transmitted. The necessary cases may include cases where SCell activation is performed, L1 and / or L3 measurements of the SCell frequency are performed, AGC, channel estimation, and time-frequency synchronization are performed, etc. This may be performed outside the above SSB-less operation scenario and / or when the UE does not support SSB-less operation.

[0180] 9 is a diagram showing an example of on-demand transmission according to Example 9 of the embodiment of the present invention. In step S101, the base station 10 transmits a signal to the terminal 20 to trigger SSB transmission in the SCell. The signal may be transmitted from the PCell or from the SCell. In step S102, the base station 10 performs SSB transmission in the SCell. The base station 10 may have a PCell, an SCell to which on-demand SSB transmission is applied, and another SCell.

[0181] The UE may receive a predetermined UL signal and / or DL ​​signaling including a predetermined parameter for triggering SSB transmission in the SCell in a DL resource with which the UE is associated and / or configured by the BS, and after receiving the signal, may perform a predetermined operation related to SCell addition and / or SCell activation, or may perform a predetermined operation related to SSB in the SCell (e.g., PDCCH reception in the SCell, CSI reporting, L3 measurement reporting in the SCell). The above series of operations will be referred to as "SSB trigger" below.

[0182] The SSB transmission trigger may be any of the following 1)-13), or any combination thereof.

[0183] 1) SSB transmission itself is triggered. 2) The following SSB transmissions are triggered: - SSB transmission at a certain period X - SSB transmission greater than, less than, longer than, or shorter than a certain period X - SSB transmission with a shorter period than the SSB currently being transmitted, currently set, or most recently received by the UE - SSB transmission with a longer period than the SSB currently being transmitted, currently set, or most recently received by the UE - Maintaining SSB transmission at the current period 3) Transmission of a certain SS burst or SS bursts within a certain period is triggered. 4) No transmission of a certain SS burst or SS bursts within a certain period is triggered. 5) SSB transmission at a certain opportunity is triggered. 6) Triggering a certain number of SSB transmissions, fewer SSB transmissions, more SSB transmissions, or maintaining the current SSB transmission. 7) Triggering of the number of SSB transmissions, fewer SSB transmissions, more SSB transmissions, or maintaining the current SSB transmission within a certain SS burst. 8) Triggering of a certain SSB. 9) Triggering of an SSB within a certain SS burst. 10) Triggering of an SSB with a different SSB index or position. 11) Triggering of an SSB with a different SSB index or position within a certain SS burst. 12) Triggering of an SSB transmission that has a predetermined QCL relationship with an applicable transmit beam or another RS. 13) Triggering of an SSB transmission that has a predetermined QCL relationship with an applicable transmit beam or another RS ​​for each SSB with a different SSB index or position.

[0184] Operation 1) A DL transmission that triggers and / or notifies the transmission of an on-demand SSB may be determined. By aligning the recognition of the signal that triggers and / or notifies the transmission of an on-demand SSB between the BS and the UE, the appropriate on-demand SSB trigger DL transmission can be transmitted and received between the UE and the BS.

[0185] Alt. 1) The UE may assume or may perform an SSB trigger upon receiving a predetermined DL signal. The DL resource to be used for the DL signal may be determined based on the parameter settings notified by the BS. The DL signal may be any of SSB, CSI-RS, and TRS. Note that the SSB trigger and the SSB transmission trigger may be interchangeable.

[0186] Alt. 2) The UE may trigger SSB by receiving a predetermined DL signaling, and the DL resource to be used for the DL signaling may be determined based on the settings of the following parameters notified by the BS:

[0187] For that given DL signaling, the UE may perform UL transmission with SSB triggering via DCI, and / or MAC-CE, and / or RRC signaling, and may perform DL reception with SSB triggering via UCI in the PHY layer, and / or MAC-CE in the MAC entity, and / or RRC signaling in the RRC.

[0188] When SSB triggering is performed by DCI or DCI in the PHY layer, the UE may perform monitoring using a PDCCH resource associated for SSB triggering based on parameters configured by the BS, or may use a PDCCH resource predefined in the specifications for SSB triggering, or may use a PDCCH resource not associated with that use.

[0189] The BS may extend DCI format 0_0, 0_1, 1_0, or 1_1 and notify the PDCCH resource in a new field, or may notify the PDCCH resource in a new DCI format 2_X. The PDCCH resource may be configured / notified in any of the following ways.

[0190] The PDCCH resource may be determined by pdcch-ConfigCommon in common signaling.

[0191] The parameters associated with the SSB trigger (e.g., on-demandSsbTrigger) included in pdcch-Config in the dedicated signaling may include the following settings:

[0192] - Configuration identifier - RNTI or RNTI for triggering a new on-demand SSB or NES-RNTI - DCI payload size - Bit positions of the start and / or end of the DCI payload - Bit positions of the start and / or end of the DCI payload in the group-common DCI - Bit positions of the start and / or end of the DCI payload that each configured UE acquires - Bit positions of the start and / or end of the DCI payload that each configured UE acquires in the group-common DCI, which may be configured for each cell and / or frequency listed below, or for each combination thereof - List or ID of combinations of cells, frequencies, or frequency IDs that trigger on-demand SSB and cells, frequencies, or frequency IDs to which the on-demand SSB is transmitted - Associated control resource set, search space, or search space ID in pdcch-Config or pdcch-ConfigCommon

[0193] The MAC-CE used in this DL signaling may be a new on-demand SSB activation MAC-CE, or an existing C-RNTI MAC-CE, UE contention resolution identity MAC-CE, timing advance command MAC-CE, DRX command MAC-CE or long DRX command MAC-CE, SCell activation or deactivation MAC-CE.

[0194] In the MAC entity, the MAC-CE used in the DL signaling may be a new on-demand SSB activation MAC-CE, or an existing C-RNTI MAC-CE, UE contention resolution identity MAC-CE, timing advance command MAC-CE, DRX command MAC-CE or long DRX command MAC-CE, SCell activation or deactivation MAC-CE.

[0195] The RRC signaling used for this DL signaling may be RRCSetupComplete or RRCReconfiguration.

[0196] Regarding the parameters to be included in the specified DL signaling used for SSB triggering, the specified DL signaling for SSB triggering may include a parameter indicating any of the following information, or the information may be selected from a characteristic candidate or characteristic candidate list for on-demand SSB that is set in advance by the BS or by the RRC, or the on-demand SSB or a specified on-demand SSB may be triggered by referencing a part (e.g., a row index) of a characteristic candidate or a characteristic candidate list for on-demand SSB that is set in advance by the BS or by the RRC and / or that is predefined in the specifications (e.g., a table).

[0197] - Information indicating that the SSB transmission itself is triggered.

[0198] The characteristics of the SSB that triggers on-demand transmission, which are included in the parameters to be included in the specified DL signaling, may be 1)-16) shown below.

[0199] 1) SSB transmission at a certain period X. 2) SSB transmission at a period greater than, less than, longer than, or shorter than X. 3) SSB transmission with a period shorter than the SSB currently being transmitted, currently set, or most recently received by the UE. 4) SSB transmission with a period longer than the SSB currently being transmitted, currently set, or most recently received by the UE. 5) Maintaining SSB transmission at the current period. 6) Triggering transmission of a certain SS burst or SS bursts within a certain period. 7) Triggering not to transmit a certain SS burst or SS bursts within a certain period. 8) Triggering SSB transmission at a certain opportunity. 9) Triggering a certain number of SSB transmissions, fewer SSB transmissions, more SSB transmissions, or maintaining the current SSB transmission. 10) Triggering a certain number of SSB transmissions, fewer SSB transmissions, more SSB transmissions, or maintaining the current SSB transmission within a certain SS burst. 11) Triggering a certain SSB. 12) Triggering an SSB within a certain SS burst. 13) Triggering an SSB with a different SSB index or position. 14) Triggering an SSB with a different SSB index or position within a certain SS burst. 15) Triggering an SSB transmission that has a predetermined QCL relationship with an applicable transmit beam or another RS. 16) Triggering an SSB transmission that has a predetermined QCL relationship with an applicable transmit beam or another RS ​​for each SSB with a different SSB index or position.

[0200] The notification of the cell or frequency on which on-demand transmission is triggered, which is included in the parameters to be included in the specified DL signaling, may be 1)-2) shown below.

[0201] 1) Cell ID or cell ID list: Serving cell index or serving cell index list, and / or PCI (Physical cell identity) or PCI list, and / or CGI (Cell Global Identity) or CGI list, and / or SCell ID or SCell ID list.

[0202] 2) Frequency or frequency list: ARFCN-NR or ARFCN-NR list, and / or SMTC or SMTC ID, and / or measoobject or measoobject ID.

[0203] The auxiliary information of the cell or frequency that triggers on-demand transmission, which is included in the parameters to be included in the specified UL signaling, may be 1)-7) shown below.

[0204] 1) Whether L1 and / or L3 measurements have been performed in idle and / or connected states. 2) Whether cell basic information (SI) has been acquired. 3) Whether the cell is a known cell or an unknown cell. 4) Whether DL and / or UL carrier aggregation is supported. 5) What the trigger conditions are. For example, SCell time-frequency synchronization, L1 measurement in the SCell, L3 measurement in the SCell, CA addition, CA activation for dormancy recovery for channel estimation (QCL). 6) L1 and / or L3 measurements in the PCell and / or other SCells. 7) Performance differences between the SCell and the PCell and / or other SCells. For example, performance differences that the UE can tolerate, or performance differences that the UE can maintain after one measurement. The performance differences may be specified in radio requirements or UE capabilities. The characteristic difference includes a power difference, a time difference, a propagation delay difference, a deviation of QCL type A, B, C or D, and the time that the UE can retain the characteristic difference after measuring it once.

[0205] Alt. 3) The BS may determine the parameters to include in the DL signaling and / or DL ​​signaling for SSB triggering based on predefined conditions and / or predefined parameters configured by the BS. For example, if certain UE capabilities are supported, configured by the BS, or predefined conditions as described in Action 2) Alt. 4 are met, the UE may perform or assume any of Actions 1) Alt. 1, Alt. 2, and Alt. 3.

[0206] By performing the above-described operation 1), the BS and the UE can align their recognition of the signal that triggers the UL transmission of the on-demand SSB, thereby enabling appropriate transmission and reception of the on-demand SSB trigger UL transmission between the UE and the BS.

[0207] Operation 2) The cell and / or resource in which the DL transmission that triggers the on-demand SSB is to be performed may be determined. By having the BS and the UE agree on the recognition of the cell or resource in which the DL transmission that triggers the on-demand SSB is to be performed, appropriate on-demand SSB trigger DL transmission can be transmitted and received between the UE and the BS.

[0208] Alt. 1) The UE may perform SSB triggering by receiving a predetermined DL signal or DL ​​signaling in the PCell. When dual connectivity is configured, this may be limited to triggering on-demand SSB in an SCell serving cell belonging to the master cell group, or may further include triggering on-demand SSB in an SCell serving cell belonging to a secondary cell group.

[0209] Alt. 2) The UE may perform SSB triggering by receiving a predetermined DL signal or DL ​​signaling in the PSCell, which may be limited to the case where dual connectivity is configured, or may be limited to the case where on-demand SSB is triggered in an SCell serving cell belonging to a master cell group, or may further include the case where on-demand SSB is triggered in an SCell serving cell belonging to a secondary cell group.

[0210] Alt. 3) The UE may trigger an on-demand SSB by receiving a predetermined DL signal or DL ​​signaling in the SCell serving cell that triggers the SSB.

[0211] Alt. 4) In a serving cell or SCell in a predetermined active state, SSB triggering may be performed by receiving a predetermined DL signal or DL ​​signaling, and a serving cell that performs DL transmission may be determined from multiple serving cells in a predetermined state based on predetermined metrics. When dual connectivity is configured, this may be limited to triggering on-demand SSB in an SCell serving cell belonging to a master cell group, or may further include triggering on-demand SSB in an SCell serving cell belonging to a secondary cell group.

[0212] The serving cell or SCell in the specified active state may be determined based on the specified conditions below, or may be determined based on the settings notified from the BS, or may be determined based on any combination of the specified conditions below and the settings notified from the BS (for example, when the notification from the BS is X, condition Y is satisfied, etc.).

[0213] The specified cell or SCell may be in the specified active state if any of the following conditions is met, or if any combination of the following conditions is met:

[0214] - PUCCH SCell or not PUCCH SCell - Timing advance (TA) group is different or the same as the PCell - TA group is the same or different as the cell or SCell that triggers on-demand SSB - Indicated by the BS as a neighboring cell (e.g. via SIB2 or SIB4 in idle mode) - L1 and / or L3 measured or not measured in idle and / or connected mode, e.g. reported to the BS at a predetermined measurement reporting event or reported to the BS X seconds ago, where X may be determined based on the parameters measCycleSCell or DRX cycles. - In SCell added state or SCell released state - In SCell activated state or SCell deactivated state - In SCell dormant state or not in SCell dormant state - Known cell or not known cell or unknown cell - Time-frequency synchronization information of the cell held by the UE is lost - Quality information of the cell held by the UE (e.g., CSI, L1 measurement, L3 measurement) is lost - SSB and / or TRS of the cell are not received or are being received - Configured from the BS and / or specified in the UE capabilities, and / or Z seconds or Z number of SSB and / or TRS and / or other signals or channels of the cell are not received or are being received within the last X seconds or Y periods. This may be limited to cases where they are received with the desired quality.

[0215] The PCell may be in the predetermined active state when any of the following conditions is satisfied, or when any combination of the following conditions is satisfied.

[0216] - BSR is in a predetermined state - BSR reported X seconds ago or determined in the UE is in a predetermined state - MCS is a predetermined value - MCS notified X seconds ago is a predetermined value - A predetermined quality in the L3 measurement report is a predetermined quality - A predetermined quality in the L3 measurement report reported X seconds ago or measured in the UE is a predetermined quality

[0217] Whether the given serving cell is in the given active state may be determined based on UE implementation.

[0218] The serving cell may be determined to be in the predetermined active state if a predetermined timer has expired or is running. For example, when a predetermined timer, which may or may not be associated with a cell or frequency and is managed per UE and / or per serving cell and / or per cell group, is running, it may be determined that an on-demand SSB cannot be triggered in the serving cell. The predetermined timer may be started or reset after an UL transmission that triggers an on-demand SSB is performed in the UE or the serving cell, or may be started or reset when the on-demand SSB is received. Different timer values ​​may be managed by the UE and the BS. The timer value may be predefined in a specification, may be set by the BS, an identifier may be set by the BS from a predefined list, or multiple lists may be set by the BS.

[0219] The serving cell and the PCell are in the specified active state when any of the following conditions is met, or when any combination of the following conditions is met.

[0220] - It is intraband - It is interband - The bands have a certain correlation, for example, the bands are closer than a certain value, for example, for band n_X and band n_Y, X<Y±5 - It is intra-frequency - It is inter-frequency - The frequencies have a certain correlation, for example, the frequencies are closer than a certain value - The FR (Frequency Range) is the same or different, for example, FR1 and FR2 - The following conditions 1)-4) are met or not met: 1) The SSB-less SCell has a TRS or A-TRS that is quasi-colocated with the reference cell. 2) The RTD is shorter than the CP length in SCS terms of the SSB-less SCell. 3) The power difference between the TRS or A-TRS of the SSB-less SCell and the reference cell is less than a certain value. 4) The RS of the SSB-less SCell is a TRS or A-TRS and QCL type A, and the TRS or A-TRS is the SSB and QCL type C of the reference cell.

[0221] Alt. 5) The UE may determine the actions of Alt. 1) to Alt. 4) based on predetermined conditions and / or predetermined parameters configured by the BS. For example, if certain UE capabilities are supported, a BS configuration is provided, or the predetermined conditions described in Actions 2) and 4) are met, the UE may perform or assume any of the actions of Alt. 1) to 3). If there are multiple DL reception cell or DL ​​resource candidates for triggering on-demand SSB, the UE may randomly select a candidate to use for SSB triggering from the candidates, select a cell and / or resource to use for SSB triggering based on a priority configured by the BS, or select a cell and / or resource to perform DL reception to use for SSB triggering based on predetermined metrics described in Alt. 1) to 4).

[0222] By performing operation 2) described above, the BS and the UE can align their recognition of the cell or resource where DL reception that triggers on-demand SSB is performed, thereby enabling appropriate on-demand SSB trigger UL transmission to be sent and received between the UE and the BS.

[0223] Operation 3) When an on-demand SSB is triggered, the cell from which the SSB is transmitted may be determined. By having the BS and the UE agree on the cell from which the on-demand SSB is triggered, the on-demand SSB transmission can be performed appropriately between the UE and the BS, and the UE can receive and perform subsequent SSB-related procedures appropriately.

[0224] Alt. 1) The UE may perform the following predetermined operations after an SSB trigger is triggered by DL reception, based on the frequency, cell, and / or SSB characteristics (e.g., period, opportunity, etc.) for transmitting one on-demand SSB set by the BS.

[0225] 1-1) The UE may obtain, from the BS, through common signaling, whether on-demand SSB in the SCell can be triggered, the frequency or cell in which on-demand SSB in the SCell can be executed, and / or predetermined parameters required for SSB triggering to be executed. The UE may obtain, from the BS, through common signaling in the PCell, whether on-demand SSB in the SCell can be triggered, the frequency or cell in which on-demand SSB in the SCell can be executed, and / or predetermined parameters required for SSB triggering to be executed.

[0226] 1-2) The UE may obtain, via dedicated signaling from the BS, whether on-demand SSB in the SCell can be triggered and / or the frequency or cell in which on-demand SSB in the SCell can be executed. The UE may obtain, via dedicated signaling in the PCell from the BS, whether on-demand SSB in the SCell can be triggered and / or the frequency or cell in which on-demand SSB in the SCell can be executed.

[0227] Note that the parameter list described below may be such that only a single entity or setting can be set.

[0228] Alt. 2) The UE may determine the frequency or cell and / or SSB-related characteristics (e.g., periodicity, opportunity) for the on-demand SSB to be transmitted based on the frequencies or cells and / or SSB-related characteristics (e.g., periodicity, opportunity) configured by the BS for the on-demand SSB transmissions based on the SSB triggers generated by the UE's reception of DL signals associated with candidates in the multiple lists, and the UE may then perform a predetermined operation. The UE may determine the frequency or cell and / or SSB-related characteristics (e.g., periodicity, opportunity) for the on-demand SSB to be transmitted based on the frequencies or cells and / or SSB-related characteristics (e.g., periodicity, opportunity) configured by the BS for the on-demand SSB transmissions based on the SSB triggers generated by the UE's transmission of UL signals associated with candidates in the multiple lists, and the UE may then perform a predetermined operation.

[0229] 2-1) The UE may obtain, from the BS, through common signaling, whether SSB triggering is permitted, a list of frequencies or cells in the SCell that can execute on-demand SSB, and predetermined parameters of DL signals required for SSB triggering associated with the list. The UE may configure or obtain, from the BS, through common signaling in the PCell, whether SSB triggering is permitted, a list of frequencies or cells in the SCell that can execute on-demand SSB, and predetermined parameters of DL signals required for SSB triggering associated with the list. The UE may obtain, from the BS, through common signaling in the serving cell that transmits on-demand SSB, whether SSB triggering is permitted, a list of frequencies or cells in the SCell that can execute on-demand SSB, and predetermined parameters of UL signals required for SSB triggering associated with the list. The UE may obtain from the BS, through common signaling in a specified serving cell, whether SSB triggering is permitted, a list of frequencies or cells in the SCell that can perform on-demand SSB, and certain UL signal parameters required to perform SSB triggering associated with the list.

[0230] The common signaling may be signaling that configures whether the operation is permitted in the MIB or SIB1 in the PCell, or signaling that configures whether the operation is permitted in the MIB or SIB1 in the SCell. The PCell may notify only UEs that support the operation that they can camp on the cell to which the on-demand SSB is transmitted. The UE may perform cell selection in the cell selection procedure taking the notification into account.

[0231] The common signaling may be signaling by a new parameter set in the existing SIB-X (2, 3, 4, ..., 2X). In SIB2 or SIB4 informing intra- or inter-frequency measurements, it may be signaled whether the SSB of the frequency supports UE-triggered on-demand SSB transmission, or a list of frequencies or cells (PCIs) in which the operation may be performed.

[0232] The common signaling may be signaling by a newly defined SIB-Y, or may be signaling notified by new parameters set in the SIB-Y.

[0233] 2-2) The UE may be configured or may acquire, via dedicated signaling from the BS, information on whether SSB triggering is possible, a list of frequencies or cells in the SCell in which on-demand SSB can be performed, and predetermined parameters of DL signals necessary for SSB triggering associated with the list. The UE may also be configured or may acquire, via dedicated signaling from the BS, information on whether SSB triggering is possible, a list of frequencies or cells in the SCell in which on-demand SSB can be performed, and predetermined parameters of UL signals necessary for SSB triggering associated with the list.

[0234] The individual signaling may be signaling notified by parameters set by RRCReconfiguration in the PCell, or signaling in which one of multiple configuration lists set by RRC is enabled or disabled by MAC-CE and / or DCI.

[0235] Regarding the parameters configured by RRCReconfiguration, in relation to the existing SCell addition parameters, SSB may or may not be configured in sCellToAddModList>sCellConfig configured under RRCReconfiguration. The UE may or may not assume that SSB is configured in sCellToAddModList>sCellConfig configured under RRCReconfiguration.

[0236] When parameters related to a new SSB trigger are set by RRCReconfiguration, the UE may ignore the parameters related to SSB transmission of the above-mentioned existing SCell, or may not perform SSB reception set in the parameters related to SSB transmission of the existing SCell.

[0237] For a parameter configured by RRCReconfiguration, the UE may implicitly determine that the SSB trigger is enabled when the parameter is not configured, or the UE may implicitly determine that the SSB trigger is enabled when a parameter subordinate to the parameter is not configured. The UE may implicitly determine that the SSB trigger is enabled only when the parameter is not configured and a predetermined condition related to SSB-less SCell operation is not satisfied.

[0238] Regarding the parameters configured by RRCReconfiguration, the UE may assume that there is a certain relationship between the parameters of the new SSB trigger and the SSB transmissions of the existing SCell, for example, that the SCS and frequency (e.g., arfcn) of the SSBs are similar.

[0239] In terms of the order of parameter settings related to adding an existing SCell, the UE may perform the specified settings related to the SSB trigger before setting the parameters related to the SSB of the existing SCell, or may perform the specified settings related to the SSB trigger afterwards, or may perform the specified settings related to the SSB trigger at the same time.

[0240] Regarding the parameters set by RRCReconfiguration, as a method of setting the specified parameters related to SSB triggering (under which parameters the characteristics of on-demand SSB are set), the UE may obtain the specified information related to the SSB of the SCell where SSB triggering may be performed from the RRC parameters set below or subordinate parameters, the BS may set the specified information in the RRC parameters below or subordinate RRC parameters, or the UE may set the RRC parameters below.

[0241] ・sCellAddModList>sCellConfig (subordinate parameters) >smtc >sCellConfigCommon>servingCellConfigCommon> (subordinate parameters) >>ssb-PositionsInBurst >>ssb-PeriodicityServingCell >>ss-PBCH-BlockPower >sCellConfigDedicated (subordinate parameters)

[0242] Parameters related to L3 and / or L1 measurements, for example, measObjectNR > ssbFrequency > ssbSubcarrierSpacing > smtc1 > smtc2 > freqBandIndicatorNR > measCycleSCell

[0243] Regarding the parameters set by RRCReconfiguration, the specific information regarding the SSB of the SCell for which SSB triggering may be performed may be obtained from the RRC parameters set below, or may include any of the following contents, or the UE may be set with any of the following parameters.

[0244] Cell ID or cell ID list: part or all of a serving cell index, serving cell index list, PCI, PCI list, CGI, or CGI list. Frequency or frequency list, ARFCN-NR, ARFCN-NR list. UL resources that trigger on-demand SSB in an SCell. UL resources that trigger on-demand SSB in an SCell associated with a cell or frequency. - Synchronization information, synchronization auxiliary information of the serving cell, such as whether the PCell and / or other SCells are time and / or frequency synchronized with the SCell triggering the on-demand SSB, the value of the time and / or frequency offset, information indicating whether the value of the time and / or frequency offset is less than or equal to a predetermined value, power information or power auxiliary information, such as information indicating whether the power between SSBs and / or TRSs of the PCell and / or other SCells and the SCell triggering the on-demand SSB is the same or whether the power difference is less than or equal to a predetermined value, the value of the power difference, QCL information, such as reference signals and QCL types of the PCell and / or other SCells for which QCL types A, B, C and / or D can be assumed, reference signal information, such as the serving cell index of the PCell and / or other SCells that can refer to the TRS resources, time, frequency and / or QCL of the SCell triggering the on-demand SSB, etc.- Synchronization information, synchronization auxiliary information of the serving cell associated with the cell or frequency, such as whether the PCell and / or other SCells and the SCell triggering the on-demand SSB are time and / or frequency synchronized, the value of the time and / or frequency offset, information indicating whether the value of the time and / or frequency offset is less than or equal to a predetermined value, power information or power auxiliary information, such as information indicating whether the power between SSBs and / or TRSs of the PCell and / or other SCells and the SCell triggering the on-demand SSB is the same or whether the power difference is less than or equal to a predetermined value, the value of the power difference, QCL information, such as reference signals and QCL types of the PCell and / or other SCells for which QCL types A, B, C and / or D can be assumed, reference signal information, such as the serving cell index of the PCell and / or other SCells that can refer to the TRS resources, time, frequency and / or QCL of the SCell triggering the on-demand SSB, etc. - Synchronization information, synchronization auxiliary information of the serving cell performing on-demand SSB in the SCell, such as whether the PCell and / or other SCells are time and / or frequency synchronized with the SCell triggering the on-demand SSB, the value of the time and / or frequency offset, information indicating whether the value of the time and / or frequency offset is less than or equal to a predetermined value, power information or power auxiliary information, such as information indicating whether the power between SSB and / or TRS of the PCell and / or other SCells and the SCell triggering the on-demand SSB is the same or whether the power difference is less than or equal to a predetermined value, the value of the power difference, QCL information, such as reference signals and QCL types of the PCell and / or other SCells for which QCL types A, B, C and / or D can be assumed, reference signal information, such as the serving cell index of the PCell and / or other SCells that can refer to the TRS resources, time, frequency and / or QCL of the SCell triggering the on-demand SSB, etc.

[0245] - Candidate characteristics for SCells that perform on-demand SSB. Periodicity or periodicity list, for example, {10, 20, 40, 80, 160, 320, 640} ms. Time domain operation, for example, aperiodic, SP (semi-persistent), periodic, etc. Other characteristics that can be set may be specified depending on the time domain operation, or different characteristics may be set. For example, the periodicity may be set only for periodic or SP, or the number of SS bursts may be set only for aperiodic. In a certain SS burst (certain opportunity), SSB transmission may be triggered 1, 2, 3, ..., N times or SS bursts after triggering, SSB transmission may be triggered for M periods, SSB transmission may be triggered for X ms, or Y bitmaps may be notified and an SS burst or multiple SS bursts may be transmitted if the bit is 0 or 1. In the bitmap, each bit may represent one or a predetermined number of multiple SS bursts. A certain number of SSB transmissions, or the number of SSB transmissions in a certain SS burst. Triggering a certain SSB, or triggering a certain SSB in a certain SS burst, triggering an SSB with a different SSB index or position in a certain SS burst. SSB transmission that has a predetermined QCL relationship with an applied transmit beam or another RS, or SSB transmission that has a predetermined QCL relationship with a transmit beam or another RS ​​applied to each SSB with a different SSB index or position.

[0246] - Candidate characteristics of an SCell that performs on-demand SSB associated with a cell or frequency. Periodicity or periodicity list, for example, {10, 20, 40, 80, 160, 320, 640} ms. Time domain operation, for example, aperiodic, SP (semi-persistent), periodic, etc. Other characteristics that can be set may be specified depending on the time domain operation, or different characteristics may be set. For example, a periodicity may be set only for periodic or SP, or the number of SS bursts may be set only for aperiodic. In a certain SS burst (certain opportunity), SSB transmission may be triggered 1, 2, 3, ..., N times or SS bursts after triggering, SSB transmission may be triggered for M periods, SSB transmission may be triggered for X ms, or Y bitmaps may be notified and an SS burst or multiple SS bursts may be transmitted if the bit is 0 or 1. In the bitmap, each bit may represent one or a predetermined number of multiple SS bursts. A certain number of SSB transmissions, or the number of SSB transmissions in a certain SS burst. Triggering a certain SSB, or triggering a certain SSB in a certain SS burst, triggering an SSB with a different SSB index or position in a certain SS burst. SSB transmission that has a predetermined QCL relationship with an applied transmit beam or another RS, or SSB transmission that has a predetermined QCL relationship with a transmit beam or another RS ​​applied to each SSB with a different SSB index or position.

[0247] Regarding the parameters set by RRCReconfiguration, specific information regarding a specific DL signal associated with the SSB of the SCell on which SSB triggering may occur may be obtained from the RRC parameters set below, or may include any of the following contents.

[0248] PRACH preamble format Time resource Frequency resource Root sequence PRACH-ConfigurationIndex (see non-patent document 3) Cyclic shift and restriction type (unrestricted, restricted set A or restricted set B) PRACH opportunity index Set of PRACH opportunities associated with a single index or a single mask index PRACH opportunity index or set of PRACH opportunity indices associated with one SSB Preamble index or preamble index associated with one SSB or one PRACH opportunity SSB and PRACH mapping information RSRP threshold in a cell in ES state to select a cell or BS to wake up RSRP threshold in a cell in ES state to select an mSSB of a cell in ES state to determine PRACH parameters Association duration index Msg1 of the random access procedure

[0249] Alt. 3) The UE may determine the frequency or cell and / or SSB-related characteristics (e.g., periodicity, opportunity) of the on-demand SSBs to be transmitted based on the frequency or cell and / or SSB-related characteristics (e.g., periodicity, opportunity) of the on-demand SSBs configured by the BS and parameters (e.g., ID and / or ID list) included in the DL signaling, and the UE may then perform a predetermined operation. The UE may also determine the frequency or cell and / or SSB-related characteristics (e.g., periodicity, opportunity) of the on-demand SSBs to be transmitted based on the frequency or cell and / or SSB-related characteristics (e.g., periodicity, opportunity) of the on-demand SSBs to be transmitted based on the frequency or cell and / or SSB-related characteristics (e.g., periodicity, opportunity) of the on-demand SSBs configured by the BS and parameters (e.g., ID and / or ID list) included in the UE's UL signaling, and the UE may then perform a predetermined operation described in Operation 5) below. The UL signaling that triggers the on-demand SSBs may include the parameters described in Operation 1) Alt. 2).

[0250] Alt. 4) The UE may decide to perform any of the actions in Alt. 1)-Alt. 3) based on predefined conditions and / or predefined parameters configured by the BS. For example, if certain UE capabilities are supported, configured by the BS, and predefined conditions described in Actions 2) and 4) are met, the UE may perform or assume any of the actions in Alt. 1)-Alt. 3).

[0251] By performing operation 3) described above, the BS and the UE can align their understanding of the cell in which on-demand SSB is triggered, thereby enabling appropriate on-demand SSB transmission to be performed between the UE and the BS, and the UE to properly receive and perform subsequent SSB-related procedures.

[0252] Action 4) The UE may determine under what conditions an on-demand SSB is triggered from the BS.

[0253] Option 1) The UE may determine whether or not an SSB transmission trigger in the SCell can be performed based on predetermined parameters set and / or notified by the BS, may perform a judgment operation for DL ​​reception that triggers SSB transmission in the SCell (i.e., may determine whether or not it can be performed), or may attempt the SSB trigger DL reception.

[0254] Details of the predetermined parameters set and / or notified by the BS are the same as those in Alt. 1 and Alt. 2) of Operation 3. Note that whether DL reception is necessary or possible to trigger SSB transmission in the SCell may be set in association with any of the following elements. An SSB with a period X may be triggered in carrier #X or cell #X using PRACH. Details of the triggering method (e.g., PRACH or UL MAC CE) may be the same as those in Operation 1). Details of the SSB characteristics may be the same as those in Alt. 2) 2-2 of Operation 2).

[0255] The possibility of "UL transmission that triggers SSB transmission in the SCell" may be set for each carrier and / or serving cell that transmits the on-demand SSB, and the carrier / cell that performs this setting / notification may be any of the following: - Carrier and / or serving cell that transmits the on-demand SSB - PCell and / or a carrier similar to the PCell - Carrier and / or serving cell that meets certain conditions

[0256] The details of the predetermined condition may be the same as the predetermined condition described in operation 2) Alt. 4).

[0257] Option 2) If the UE supports and / or reports, in the predetermined UE capabilities and / or predetermined assistance information, predetermined operation parameters related to on-demand SSB and / or predetermined operation or parameters related to UL transmissions that trigger SSB transmission, the UE may perform DL reception that triggers SSB transmission in the SCell, may perform a decision operation for DL ​​reception that triggers SSB transmission in the SCell (i.e., may decide whether to perform it), or may attempt DL reception of the SSB trigger. The predetermined UE capabilities may be configured at any of the following granularities:

[0258] UE, FR1, FR2, FR2-1, FR2-2, SCS, band, band combination, feature combination, FSPC (per feature set per component carrier), UE, cell, each TDD, each FDD.

[0259] Note that whether or not DL reception that triggers SSB transmission in the SCell is supported may be configured in association with any of the following factors: For example, supporting the use of DCI to trigger SSB with period X in carrier #X or cell #X for SCell activation, etc.

[0260] Trigger method, e.g., DCI or DL ​​MAC-CE, details of which may be the same as in operation 1). Characteristics of the association with SSB or other RS ​​(e.g., aperiodic SSB, periodic SSB with period X, a TRS with a predetermined QCL relationship, etc.), details of which may be the same as in Alt. 2)2-2 of operation 2). Use of on-demand SSB transmission and / or operation after transmission, details of which may be the same as in operation 5), which will be described later.

[0261] Option 3) The UE may perform or attempt DL reception that triggers SSB transmission in the SCell, or may perform a decision operation for DL ​​reception that triggers SSB transmission in the SCell, i.e., may decide whether to perform DL reception that triggers SSB transmission in the SCell, if any predetermined condition (which may be any combination of conditions) is met. The predetermined condition may be the same as that in operation 2) Alt. 4) for the PCell and / or serving cell. For example, if the UL transmission suppression timer for a certain cell X has expired and the quality of the serving cell is XX, the UE may perform UL transmission that triggers on-demand SSB in the serving cell.

[0262] Option 4) The UE may decide which of the following actions to take based on predetermined conditions and / or predetermined parameters configured by the BS. For example, if certain UE capabilities are supported, certain settings are configured by the BS, and certain conditions described in Action 2) Alt. 4) are met, the UE may perform any of the actions from Option 1) to Option 3).

[0263] By the above-mentioned operation 4), the BS and the UE have the same understanding of the conditions for triggering on-demand SSB, and the BS can transmit an appropriate trigger DL signal, manage resources, and transmit on-demand SSB.

[0264] Action 5) After on-demand SSB is triggered, the UE may decide what actions to assume and what procedures to follow.

[0265] The procedure assumed or performed by the UE after receiving an on-demand SSB triggered DL transmission and / or the on-demand SSB itself may vary depending on the UE capabilities. The procedure may vary depending on the triggering conditions that triggered the DL. The procedure may vary depending on the triggered DL transmission parameters and / or the UE conditions at the time of reception. The procedure may vary depending on the parameters previously set by the BS. This procedure may also be applied to UE-triggered on-demand SSB transmissions other than BS-triggered on-demand SSB transmissions.

[0266] The predetermined period may be any of the following, or may be determined based on parameters set by the BS: it may be specified or set in sub-millisecond, millisecond, second, symbol, slot, subframe, or SFN.

[0267] - During a time window set by the BS or from a reference point until after a certain delay (application delay, processing delay) - During a time window specified in the specifications or from a reference point until after a certain delay - During a time window determined based on UE capabilities or from a reference point until after a certain delay - During a time window that varies depending on the SCS set by the BS or from a reference point until after a certain delay - During a time window that varies depending on the SCS specified in the specifications or from a reference point until after a certain delay - During a time window that varies depending on the SCS determined based on UE capabilities or from a reference point until after a certain delay - During a time window from a reference point set by the BS or from a reference point until after a certain delay - During a time window from a reference point specified in the specifications or from a reference point until after a certain delay - During a time window from a reference point determined based on UE capabilities or from a reference point until after a certain delay

[0268] In addition, "from the reference point" may mean after receiving a DL signal that triggers an SSB and is transmitted from the BS, receiving a notification, or receiving a setting, and / or after receiving a specified notification related to the SSB trigger that is notified from the BS, and / or after the UE transmits a specified UL response in response to the notification from the BS, and / or from the reference time (SFN, slot number, symbol number) set by the BS.

[0269] Option 1) The UE may expect SSBs to be transmitted from the BS at a predetermined periodic interval after performing or being notified of DL reception that triggers SSB transmission in the SCell. The UE may also expect SSBs to be transmitted from the BS at a predetermined periodic interval after performing DL reception that triggers SSB transmission in the SCell. The predetermined period may be determined based on parameters previously set by the BS, may refer to predetermined parameters notified by the BS at the time of on-demand SSB transmission, or may be determined based on DL reception triggered by the BS.

[0270] Option 2) The UE may expect a predetermined number of SSB transmissions from the BS after performing or being notified of DL reception that triggers SSB transmission in the SCell. The UE may also expect a predetermined number of SSB transmissions from the BS within a predetermined period after performing DL reception that triggers SSB transmission in the SCell. The predetermined number may be determined based on a parameter previously set by the UE from the BS, may refer to a predetermined parameter notified by the BS at the time of on-demand SSB transmission, or may be determined based on DL reception triggered by the BS.

[0271] The predetermined number of times may be the number of times of SSB transmission determined based on any of the following factors.

[0272] The predetermined number of times may be determined based on the time domain operation, such as aperiodic, SP, periodic, etc. Other characteristics may be defined depending on the time domain operation, or different characteristics may be set. For example, the period may be set only in the case of periodic or SP, or the number of SS bursts may be set only in the case of aperiodic.

[0273] In a certain SS burst (certain opportunity), triggering SSB transmission 1, 2, 3, ..., N times or SS bursts after triggering, triggering SSB transmission for M cycles, triggering SSB transmission for X ms, notifying Y bitmaps and transmitting an SS burst when the bit is 0 or 1, or transmitting multiple SS bursts. Regarding the bitmap, each bit may represent one or a predetermined number of multiple SS bursts. A certain number of SSB transmissions, or the number of SSB transmissions within a certain SS burst. Triggering a certain SSB, or triggering a certain SSB within a certain SS burst, or triggering an SSB with a different SSB index or position within a certain SS burst. SSB transmission with a predetermined QCL relationship with an applied transmit beam or with a certain other RS, or SSB transmission with a predetermined QCL relationship with a transmit beam or with a certain other RS ​​for each SSB with a different SSB index or position.

[0274] Option 3) After receiving or being notified of an SSB transmission trigger in the SCell, the UE may use the SSB transmitted from the BS to perform a predetermined operation related to the SSB and / or a predetermined operation related to the SCell and / or a predetermined operation related to L1 and / or L3 measurements. Also, after performing an UL transmission that triggers an SSB transmission in the SCell, the UE may use the SSB transmitted from the BS to perform a predetermined operation related to the SSB and / or a predetermined operation related to the SCell and / or a predetermined operation related to L1 and / or L3 measurements during a predetermined period of time.

[0275] The predetermined operation related to the SSB may be any of the following.

[0276] Attempt to receive SSB Acquire DMRS and / or PBCH of SSB and / or associated SIB1 Time and / or frequency synchronization AGC Channel estimation (may use QCL relation)

[0277] The predetermined operation related to the SCell may be any of the following, or may be a predetermined operation that satisfies the radio requirement specifications and / or RRM specifications related to any of the operations.

[0278] SCell addition or SCell release SCell activation or SCell deactivation

[0279] The predetermined operation related to the L1 and / or L3 measurement may be any of the following, or may be a predetermined operation that satisfies the radio requirement specifications and / or RRM specifications related to any of the operations.

[0280] CSI measurements L3 measurements (RSRP, RSRQ or SINR) Idle L3 measurements (RSRP, RSRQ or SINR) Connected L3 measurements (RSRP, RSRQ or SINR) L3 measurements for CSI-RS and / or SSB (RSRP, RSRQ or SINR) Idle L3 measurements for CSI-RS and / or SSB (RSRP, RSRQ or SINR) Connected L3 measurements for CSI-RS and / or SSB (RSRP, RSRQ or SINR)

[0281] Option 4) The UE may receive predetermined signaling or parameters related to the SSB transmitted from the BS, where the predetermined signaling or parameters may be any of the following, and may determine or perform subsequent operations (e.g., predetermined reception operations related to the on-demand SSB and / or predetermined operations related to the subsequent SCell and / or predetermined UL transmission operations) based on the predetermined notification. Also, the UE may receive predetermined signaling or parameters related to the SSB transmitted from the BS in the PCell, the serving cell to which the on-demand SSB is transmitted, or a predetermined serving cell, where the predetermined notification may be any of the following, and may determine or perform subsequent operations (e.g., predetermined reception operations related to the on-demand SSB and / or predetermined operations related to the subsequent SCell and / or predetermined UL transmission operations) based on the predetermined notification.

[0282] The predetermined signaling may be any of the following, but is not limited to the following:

[0283] - RRC signaling RRCReconfiguration. It may be the parameters of Action 3) Alt. 2) 2-2. It may be new signaling with on-demand SSB transmission. - SCell Activation Command or Fast SCell Activation Command in RRC or MAC-CE. It may be new signaling with on-demand SSB transmission. - A predetermined DCI format scrambled with X-RNTI. X-RNTI may be, but is not limited to, NES-RNTI, SI-RNTI, or a new DCI format and / or RNTI indicating on-demand SSB transmission. - DCI format 0_0, 0_1, 1_0, 1_1 may be used, and may be a short message, a DCI that triggers a CSI report, a DCI that triggers a CSI report in the SCell where the on-demand SSB is transmitted, a DCI that schedules a PDSCH, a DCI that schedules a PDSCH, a new DCI that schedules a PDSCH, a DCI that schedules a PDSCH in the SCell where the on-demand SSB is transmitted, a new DCI that schedules a PDSCH in the SCell where the on-demand SSB is transmitted, a DCI that triggers a TRS or SRS, a DCI that triggers aperiodic TRS or SRS, a DCI that triggers a TRS or SRS in the SCell where the on-demand SSB is transmitted, or a DCI that triggers aperiodic TRS or SRS in the SCell where the on-demand SSB is transmitted.

[0284] The predetermined parameters may be any of the following, but are not limited to the following:

[0285] Parameters related to the reference point or start point and / or duration and / or time width at which on-demand SSB is transmitted. Parameters related to candidate characteristics of the SCell performing on-demand SSB transmission, as described in Operation 3) Alt. 2) 2-2, or parameters related to candidate characteristics of the SCell performing on-demand SSB transmission associated with the cell and / or frequency.

[0286] Option 5) The UE may perform a predetermined UL transmission, may execute the predetermined operation of option 4), or may execute a predetermined operation to trigger an on-demand SSB again if the on-demand SSB itself and / or the predetermined notification related to the on-demand SSB transmission transmitted from the BS is not received. Also, the UE may perform a predetermined UL transmission after receiving the on-demand SSB itself and / or the predetermined notification related to the on-demand SSB transmission transmitted from the BS, may execute the predetermined operation of option 4), or may execute a predetermined operation to trigger an on-demand SSB again if the on-demand SSB itself and / or the predetermined notification related to the on-demand SSB transmission is not received from the BS.

[0287] The predetermined UL transmission may be, but is not limited to, any of the following signaling:

[0288] - It may be an L3 measurement report or new signaling related to on-demand SSB transmission. - It may be an L3 measurement report in RRC or new signaling related to on-demand SSB transmission. - It may be new signaling related to on-demand SSB transmission. - It may be new signaling related to on-demand SSB transmission at the MAC entity or MAC layer. - It may be UCI (HARQ-ACK / NACK, CSI report, SR), SRS, PRACH, or new UCI related to on-demand SSB transmission, but is not limited to these. - It may be UCI (HARQ-ACK / NACK, CSI report, SR), SRS, PRACH, or new UCI related to on-demand SSB transmission at the PHY layer, but is not limited to these.

[0289] The predetermined action that triggers the on-demand SSB again may be, but is not limited to, any of the following:

[0290] The UE may re-execute the operation described in operation 1). The UE may increment a predetermined counter value (for example, a parameter to be included in the UL signaling may be incremented, or an identifier associated with the UL signal may be incremented to use other resources) and perform UL transmission. The UE may be configured independently from the BS with respect to the UL resource for the re-execution and / or the X-th trigger. The UE may perform UL transmission by changing power ramping, MCS change, repetition, number of repetitions, and specified UL resource amount.

[0291] The predetermined parameters may be any of the following, but are not limited to the following:

[0292] - Parameters related to the reference point or starting point and / or duration or time width at which an on-demand SSB is transmitted. - Parameters related to the reference point or starting point and / or duration or time width at which an on-demand SSB that is to be retransmitted or is different from the initial transmission is transmitted. - Operation 3) Alt. 2) Candidate characteristics of the SCell transmitting the on-demand SSB, candidate characteristics of the SCell transmitting the on-demand SSB associated with the cell or frequency, or candidate characteristics of the SCell transmitting the on-demand SSB that is to be retransmitted or is different from the initial transmission, as described in 2-2.

[0293] The above-mentioned operation 5) allows the BS and UE to properly perform procedures related to on-demand SSB (e.g., SSB reception, SCell addition, SCell activation, SSB L1 or L3 measurement) after on-demand SSB trigger or SSB transmission.

[0294] Which of the above embodiments is to be used may be set by higher layer parameters, may be reported from the terminal 20 to the base station 10 as UE capabilities, may be defined by specifications, may be reported from the terminal 20 to the base station 10 as UE capabilities and set by higher layer parameters, or may be notified by DCI. A WUS (Wake up signal) for the base station may be used for cell DTX in addition to cell DRX.

[0295] In addition, a UE capability may be defined indicating whether cell DTX and cell DRX are supported, a UE capability may be defined indicating whether dynamic enabling or disabling of cell DTX and cell DRX is supported, and a UE capability may be defined indicating whether cell DTX and cell DRX with UE DRX or CDRX are supported.

[0296] Note that cell DTX / DRX may be replaced with cell DTX and / or cell DRX. Activation / deactivation may be replaced with activation and / or deactivation, activation and / or deactivation, etc.

[0297] The above-described embodiment allows for the introduction of UE-triggered on-demand transmission of SSBs in secondary cells to achieve NES.

[0298] That is, a technique is provided in which a base station capable of transitioning to a power saving state performs on-demand transmission of a synchronization signal.

[0299] (Device Configuration) Next, a functional configuration example of the base station 10 and the terminal 20 that execute the processes and operations described above will be described. The base station 10 and the terminal 20 include functions for executing the above-described embodiments. However, the base station 10 and the terminal 20 may each include only the proposed functions of any of the embodiments.

[0300] <Base Station 10> Fig. 10 is a diagram showing an example of the functional configuration of a base station. As shown in Fig. 10, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 10 is merely an example. The names of the functional divisions and functional units may be any as long as they can perform the operations related to the embodiment of the present invention. The transmitting unit 110 and the receiving unit 120 may be called a communication unit.

[0301] The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiver 120 has a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of a higher layer from the received signal. The transmitter 110 also has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20. The transmitter 110 also transmits the setting information, etc., described in the embodiments.

[0302] 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 out the information from the storage device as needed. The control unit 140 performs, for example, overall control of the base station 10, including control related to signal transmission and reception. Note that the functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120. The transmitting unit 110 and the receiving unit 120 may also be called a transmitter and a receiver, respectively.

[0303] <Terminal 20> Fig. 11 is a diagram showing an example of the functional configuration of a terminal. As shown in Fig. 11, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 11 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations related to the embodiment of the present invention. The transmitting unit 210 and the receiving unit 220 may be called a communication unit.

[0304] The transmitter 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiver 220 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals. The transmitter 210 also transmits HARQ-ACK, and the receiver 220 receives the setting information and the like described in the embodiments.

[0305] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 in a storage device and reads it out from the storage device as needed. The setting unit 230 also stores setting information that is set in advance. The control unit 240 performs overall control of the terminal 20, including control related to signal transmission and reception. Note that the function unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and the function unit related to signal reception in the control unit 240 may be included in the receiving unit 220. The transmitting unit 210 and the receiving unit 220 may also be called a transmitter and a receiver, respectively.

[0306] The terminal or base station of this embodiment may be configured as a terminal or base station shown in each of the following items. Also, the following communication method may be implemented.

[0307] <Configuration Related to the Present Embodiment> (Item 1) A terminal comprising: a control unit that determines a resource for receiving a DL (Downlink) transmission that triggers an on-demand SSB (SS / PBCH block) in an SCell (Secondary Cell); and a receiving unit that receives the DL transmission from a base station in the resource, wherein the receiving unit receives the SSB in the SCell from the base station, and the control unit determines the SCell. (Item 2) The terminal according to item 1, in which the control unit determines whether to receive the DL transmission. (Item 3) The terminal according to item 1, in which the control unit assumes characteristics of the SSB transmitted from the SCell. (Item 4) The terminal according to item 1, in which the receiving unit determines to receive information related to the triggering SSB from the base station via RRC signaling. (Item 5) The terminal according to item 1, in which the control unit, if unable to receive the SSB transmitted from the SCell, performs DL reception again to trigger an on-demand SSB. (Clause 6) A communication method in which a terminal executes the following procedures: determining a resource for receiving a DL (Downlink) transmission that triggers an on-demand SSB (SS / PBCH block) in an SCell (Secondary Cell); receiving the DL transmission from a base station in the resource; receiving the SSB from the base station in the SCell; and determining the SCell.

[0308] Any of the above configurations provides a technique for a base station capable of transitioning to a power saving state to perform on-demand transmission of a synchronization signal. According to paragraphs 2 to 5, in order to realize NES, on-demand transmission of SSBs triggered by a UE can be introduced in a secondary cell.

[0309] (Hardware Configuration) The block diagrams (FIGS. 10 and 11) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0310] Functions include, but are not limited to, judgment, determination, assessment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0311] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 12 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may be physically 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.

[0312] In the following description, the term "apparatus" can be interpreted 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 the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0313] Each function in the base station 10 and the terminal 20 is realized by loading specified software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0314] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0315] The processor 1001 also reads programs (program codes), software modules, 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 in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 10 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 11 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may also be transmitted from a network via a telecommunications line.

[0316] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0317] The secondary storage device 1003 is a computer-readable recording medium, and may be, 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-mentioned 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 secondary storage device 1003.

[0318] The communication device 1004 is hardware (transmission / reception device) for communicating 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 a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0319] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0320] Furthermore, 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 between each device.

[0321] Furthermore, 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), or 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 pieces of hardware.

[0322] Fig. 13 shows an example configuration of a vehicle 2001. As shown in Fig. 13, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example.

[0323] The drive unit 2002 is configured, for example, by an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0324] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2029 provided in the vehicle 2001. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0325] The signals from the various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the current of the motor, a rotation speed signal of the front and rear wheels obtained by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0326] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing various types of information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 provides various types of multimedia information and multimedia services to the occupants of the vehicle 2001 by using information acquired from external devices via the communication module 2013, etc.

[0327] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driving burden on the driver, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS, etc.), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. In addition, the driving assistance system unit 2030 transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0328] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 29, which are provided in the vehicle 2001.

[0329] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

[0330] The communication module 2013 transmits, via wireless communication to an external device, a current signal from the current sensor that is input to the electronic control unit 2010. The communication module 2013 also transmits, via wireless communication to an external device, the rotation speed signals of the front and rear wheels acquired by a rotation speed sensor 2022, the air pressure signals of the front and rear wheels acquired by an air pressure sensor 2023, the vehicle speed signal acquired by a vehicle speed sensor 2024, the acceleration signal acquired by an acceleration sensor 2025, the accelerator pedal depression amount signal acquired by an accelerator pedal sensor 2029, the brake pedal depression amount signal acquired by a brake pedal sensor 2026, the shift lever operation signal acquired by a shift lever sensor 2027, and detection signals for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028, all of which are input to the electronic control unit 2010.

[0331] The communication module 2013 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from external devices and displays it on the information service unit 2012 provided in the vehicle 2001. The communication module 2013 also stores the various information received from the external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.

[0332] (Supplementary Notes on the Embodiments) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; matters described in two or more items may be used in combination as needed, and matters described in one item may apply to matters described in another item (as long as there is no contradiction). Boundaries between functional units or processing units in functional block diagrams do not necessarily correspond to boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station 10 and terminal 20 have been described using functional block diagrams, but such devices may be realized by hardware, software, or a combination thereof. The software operated by the processor of the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor of the terminal 20 in accordance with an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0333] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0334] Each aspect / embodiment described in the present disclosure may be implemented using any of the following standards: LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal number)), FRA (Future Radio Access), NR (new Radio), New radio access (NX), Future generation radio access (FX), 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 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802.34 ( The present invention may be applied to at least one of systems using 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), or other suitable systems, and next-generation systems that are extended, modified, created, or defined based on these systems. The present invention may also be applied to a combination of multiple systems (e.g., a combination of LTE and / or LTE-A with 5G).

[0335] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be rearranged unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0336] In this specification, a specific operation described as being performed by the base station 10 may be performed by its upper node in some cases. 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 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0337] The information, signals, etc. described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0338] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0339] In the present disclosure, the determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0340] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0341] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0342] 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. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0343] 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). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0344] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0345] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0346] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0347] In the present disclosure, terms such as "base station (BS)," "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," and "component carrier" may be used interchangeably. A base station may also be referred to by terms such as a macrocell, a small cell, a femtocell, and a picocell.

[0348] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage.

[0349] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," and the like may be used interchangeably.

[0350] 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 terminology.

[0351] At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do 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.

[0352] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals 20 (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0353] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station may be configured to have the functions of the user terminal described above.

[0354] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0355] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may 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 may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0356] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0357] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0358] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0359] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0360] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0361] A radio 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. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0362] Numerology may be communication parameters that apply to the transmission and / or reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, specific windowing operations performed by the transceiver in the time domain, etc.

[0363] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0364] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0365] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0366] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, 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, minislot, etc. instead of a subframe.

[0367] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0368] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0369] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0370] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0371] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0372] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0373] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0374] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0375] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0376] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0377] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be set for the terminal 20 within one carrier.

[0378] At least one of the configured BWPs may be active, and the terminal 20 may not expect to transmit or receive a predetermined signal / channel outside the active BWP. Note that the terms "cell," "carrier," and the like in this disclosure may be read as "BWP."

[0379] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples, and various changes may be made to the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc.

[0380] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0381] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0382] The aspects / embodiments described in this disclosure may be used alone, in combination, or switched depending on the implementation. Notification of predetermined information (e.g., notification that "X is true") is not limited to explicit notification, but may be implicit (e.g., not notifying the predetermined information).

[0383] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

[0384] 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 2001 Vehicle 2002 Drive unit 2003 Steering unit 2004 Accelerator pedal 2005 Brake pedal 2006 Shift lever 2007 Front wheels 2008 Rear wheels 2009 Axle 2010 Electronic control unit 2012 Information service unit 2013 Communication module 2021 Current sensor 2022 Rotation speed sensor 2023 Tire pressure sensor 2024 Vehicle speed sensor 2025 Acceleration sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object detection sensor 2029 Accelerator pedal sensor 2030 Driving assistance system unit 2031 Microprocessor 2032 Memory (ROM, RAM) 2033 Communication port (IO port)

Claims

1. A terminal having: a control unit that determines a resource for receiving a DL (Downlink) transmission that triggers an on-demand SSB (SS / PBCH block) in an SCell (Secondary Cell); and a receiving unit that receives the DL transmission from a base station in the resource, wherein the receiving unit receives the SSB in the SCell from the base station, and the control unit determines the SCell.

2. The terminal of claim 1, wherein the control unit determines whether to receive the DL transmission.

3. The terminal according to claim 1, wherein the control unit assumes characteristics of the SSB transmitted from the SCell.

4. The terminal according to claim 1, wherein the receiver determines to receive information relating to the triggering SSB from the base station via RRC signaling.

5. The terminal according to claim 1, wherein the control unit, when unable to receive the SSB transmitted from the SCell, executes DL reception again to trigger an on-demand SSB.

6. A communication method in which a terminal executes the following procedures: determining a resource for receiving a DL (Downlink) transmission that triggers an on-demand SSB (SS / PBCH block) in an SCell (Secondary Cell); receiving the DL transmission from a base station in the resource; receiving the SSB from the base station in the SCell; and determining the SCell.

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