Terminal and communication method

Abstract

To provide a terminal and a method for clarifying the operation related to terminal monitoring in a wireless communication recovery procedure and maintaining the reliability of communication.SOLUTION: In a mobile communication system, a terminal 20 includes a transmission unit that transmits a signal related to a request for recovery from a radio link failure or beam failure, a receiving unit that receives a predetermined response to the request, and a control unit that performs predetermined monitoring on the basis of the timing of execution of the recovery.SELECTED DRAWING: Figure 16

Description

[Technical Field]

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

[0002] Technologies are being considered for achieving further increases in 3GPP (registered trademark) system capacity, further increases in data transmission speed, and further reductions in latency in wireless sections (e.g., Non-Patent Documents 1 and 2).

[0003] 3GPP Release 19 discusses technologies for a low-power wake-up signal (LP-WUS) and a wake-up receiver (LP-WUR) for receiving the LP-WUS in order to reduce power consumption in wireless communication systems. It also considers a procedure for triggering physical downlink control channel (PDCCH) monitoring using the LP-WUS in RRC_CONNECTED mode, in which a radio resource control (RRC) connection between a terminal and a base station is established.

[0004] In previous releases, Radio Link Monitoring (RLM) and Radio Link Failure Recovery (RLFR) procedures were studied to detect Radio Link Failure (RLF) in wireless communication systems (for example, Non-Patent Document 1). Also, in beamforming, a Beam Failure Recovery (BFR) procedure was studied to detect Beam Failure (BF) and switch to another beam (for example, Non-Patent Document 1). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] 3GPP TS 38.300 V18.2.0(2024-06) [Non-patent document 2] 3GPP TS 38.401 V18.2.0(2024-06) Summary of the Invention [Problem to be solved by the invention]

[0006] In the current discussion, it has been confirmed that the terminal can trigger RLFR / BFR even while performing LP-WUS monitoring without performing PDCCH monitoring. When the terminal triggers RLFR / BFR, it autonomously activates PDCCH monitoring to receive a response to the RLFR / BFR.

[0007] However, there has been insufficient consideration as to whether the terminal should perform LP-WUS monitoring while the terminal is performing the RLFR procedure / BFR procedure. Furthermore, there has also been insufficient consideration as to how the terminal should resume LP-WUS monitoring if the terminal falls back to conventional PDCCH monitoring after performing the RLFR procedure / BFR procedure. If LP-WUS monitoring is not performed appropriately during and after the execution of the RLFR procedure / BFR procedure, there is a risk that the terminal will consume unnecessary power due to a deterioration in power efficiency, etc.

[0008] The present invention has been made in view of the above problems, and clarifies the operation relating to terminal monitoring in the wireless communication recovery procedure, thereby maintaining the reliability of communication. [Means for solving the problem]

[0009] According to the disclosed technology, a terminal is provided that has a transmitting unit that transmits a signal related to a request for recovery from a radio link failure or beam failure, a receiving unit that receives a predetermined response to the request, and a control unit that performs predetermined monitoring based on the timing of execution of the recovery. [Effects of the Invention]

[0010] According to the disclosed technology, it is possible to clarify the operation related to terminal monitoring in the wireless communication recovery procedure, and to maintain the reliability of communication. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram (1) showing an example of the configuration of a wireless communication system. [Figure 2] FIG. 2 is a diagram (2) showing an example of the configuration of a wireless communication system. [Figure 3] FIG. 3 is a diagram (1) for explaining communication by LP-WUS / LP-WUR. [Figure 4] FIG. 4 is a diagram (2) for explaining communication by LP-WUS / LP-WUR. [Figure 5] FIG. 5 is a diagram (1) showing an example of a procedure in which the LP-WUS triggers PDCCH monitoring. [Figure 6] FIG. 6 is a diagram (2) showing an example of a procedure in which the LP-WUS triggers PDCCH monitoring. [Figure 7] FIG. 7 is a diagram (3) showing an example of a procedure in which the LP-WUS triggers PDCCH monitoring. [Figure 8] FIG. 8 is a diagram (4) showing an example of a procedure in which the LP-WUS triggers PDCCH monitoring. [Figure 9] FIG. 9 is a diagram illustrating an example of an RRC re-establishment procedure in the event of an RLF. [Figure 10] FIG. 10 is a diagram illustrating an example of a BFR procedure for a PCell. [Figure 11] FIG. 11 is a flowchart illustrating an example of the operation of the terminal according to the first embodiment. [Figure 12] FIG. 12 is a flowchart illustrating an example of the operation of the terminal according to the embodiment 2-1. [Figure 13] FIG. 13 is a flowchart illustrating an example of the operation of the terminal according to the embodiment 2-2. [Figure 14] FIG. 14 is a diagram illustrating an example of the operation of the terminal according to the embodiment 2-3. [Figure 15] FIG. 15 is a diagram illustrating an example of a functional configuration of a base station. [Figure 16] FIG. 16 is a diagram illustrating an example of a functional configuration of a terminal. [Figure 17] FIG. 17 is a diagram illustrating an example of the hardware configuration of a base station and a terminal. [Figure 18] FIG. 18 is a diagram illustrating an example of the configuration of a vehicle. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples, and the embodiments to which the present invention is applicable are not limited to the following embodiments.

[0013] In the following description, unless otherwise specified or unless a different meaning is clear from the context, " / " means "and / or."

[0014] In the operation of the wireless communication system of this embodiment, existing technologies are used as appropriate. However, the existing technologies are, for example, existing LTE (Long Term Evolution), but are not limited to existing LTE. Furthermore, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and systems subsequent to LTE-Advanced (for example, NR (New Radio)) unless otherwise specified.

[0015] In the present embodiment described below, terms used in existing LTE, such as synchronization signal (SS), primary synchronization signal (PSS), secondary synchronization signal (SSS), physical broadcast channel (PBCH), physical random access channel (PRACH), physical downlink control channel (PDCCH), physical downlink shared channel (PDSCH), physical uplink control channel (PUCCH), and physical uplink shared channel (PUSCH), are used. This is for convenience of description, and similar signals, functions, and the like may be called by other names. The above-mentioned terms in NR may be referred to as SS, PSS, SSS, PBCH, PRACH, and the like without any particular distinction from those in LTE.

[0016] In this embodiment, 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.).

[0017] In this embodiment, "configuring" radio parameters etc. may mean that predetermined values ​​are pre-configured, or that radio parameters notified from a base station or a terminal are set.

[0018] <System configuration> Fig. 1 is a diagram (1) showing an example of the configuration of a wireless communication system in this embodiment. As shown in Fig. 1, the wireless communication system in this embodiment 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.

[0019] 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. 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. The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signal is, for example, a PSS and an SSS. The system information is transmitted, for example, via a PBCH or a PDSCH, and is also referred to as broadcast information. The synchronization signal and system information may be referred to as a synchronization signal block (SS / PBCH Block) (SSB). As shown in FIG. 1 , the base station 10 transmits a control signal or data to the terminal 20 on a downlink (DL) and receives a control signal or data from the terminal 20 on an uplink (UL). 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 can apply Multiple Input Multiple Output (MIMO) communication to DL or UL. Furthermore, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell) and a primary cell (PCell) using carrier aggregation (CA). Furthermore, the terminal 20 may communicate via a PCell of the base station 10 and a primary secondary cell group cell (PSCell) of another base station 10 using dual connectivity (DC).

[0020] 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 the propagation path quality based on the reception results of the reference signals.

[0021] FIG. 2 is a diagram (2) showing an example of the configuration of a wireless communication system according to this embodiment.

[0022] As shown in FIG. 2, the terminal 20 communicates with a base station 10A provided by the NR system and a base station 10B provided by the NR system (hereinafter, when the base stations 10A and 10B are not distinguished from each other, they may be referred to as "base station 10"). Furthermore, the terminal 20 supports NR-NR dual connectivity, i.e., NR-DC, in which the base station 10A is the master node (MN) and the base station 10B is the secondary node (SN). The terminal 20 can simultaneously use multiple component carriers (CCs) provided by the base station 10A, which is the master node, and the base station 10B, which is the secondary node, to perform simultaneous transmission or reception with the base station 10A, which is the master node, and the base station 10B, which is the secondary node.

[0023] 2, the terminal 20 may communicate with a base station 10A provided by an LTE system and a base station 10B provided by an NR system. Furthermore, the terminal 20 may support LTE-NR dual connectivity, i.e., EN-DC, in which the base station 10A is an MN and the base station 10B is an SN. The terminal 20 can simultaneously use multiple CCs provided by the base station 10A, which is the master node, and the base station 10B, which is the secondary node, to perform simultaneous transmission or reception with the base station 10A, which is the master node, and the base station 10B, which is the secondary node.

[0024] 2, the terminal 20 may communicate with a base station 10A provided by the NR system and a base station 10B provided by the LTE system. Furthermore, the terminal 20 may support NR-LTE dual connectivity, i.e., NE(NR-E-UTRA)-DC, in which the base station 10A is an MN and the base station 10B is an SN. The terminal 20 can simultaneously use multiple CCs provided by the base station 10A, which is the master node, and the base station 10B, which is the secondary node, to perform simultaneous transmission or reception with the base station 10A, which is the master node, and the base station 10B, which is the secondary node.

[0025] 2, the terminal 20 may communicate with a base station 10A provided by the NR system and a base station 10B provided by the NR system. Furthermore, the terminal 20 may support NR-NR dual connectivity, i.e., NR-DC, in which the base station 10A is an MN and the base station 10B is an SN. The terminal 20 can simultaneously use multiple CCs provided by the base station 10A, which is the master node, and the base station 10B, which is the secondary node, to perform simultaneous transmission or reception with the base station 10A, which is the master node, and the base station 10B, which is the secondary node.

[0026] Terminal 20 in this embodiment may perform communication using one serving cell, or may perform communication using multiple serving cells (e.g., CA or DC). The processing operations in this embodiment may be executed in the system configuration shown in Fig. 1, the system configuration shown in Fig. 2, or other system configurations.

[0027] <lp-wus lp-wur> FIG. 3 is a diagram (1) illustrating communication using LP-WUS / LP-WUR. In 3GPP Release 19, a power consumption reduction technology called "Low Power Wake Up Signal and Receiver" is under discussion. The low power wake up signal (Low Power Wake Up Signal) is called LP-WUS or WUS, and the low power wake up signal receiver (Low Power Wake Up Receiver) is called LP-WUR, WUR, or LR. As shown in FIG. 3(a), a state called Ultra Deep Sleep (UDS) is introduced by operating an LR, a simplified circuit that operates with lower power consumption than the main radio (MR) used in normal data communication. As shown in FIG. 3(b), when the LR detects an LP-WUS and resumes communication with the base station 10, the power of the MR is turned on. In this way, the power of the MR may be turned off or on when the LR receives an LP-WUS signal. In other words, the LP-WUS can be considered a control signal used to switch the state of the MR. Switching the state of the MR may be, for example, switching between a power-on state and an power-off state, or switching between a power-on state and a sleep state. Alternatively, as described above in FIG. 4, the LP-WUS may be a signal indicating whether or not a paging occasion (PO) should be monitored. Here, a paging occasion means an opportunity at which the terminal 20 may receive a paging. The LP-WUS may be a predetermined sequence, or may be information (for example, a Paging Early Indication (PEI)) included in downlink control information (DCI).

[0028] FIG. 4 is a diagram (2) for explaining communication by LP-WUS / LP-WUR. In 3GPP, the functional details of the application method are under discussion for the RRC connection state in any of RRC_CONNECTED, RRC_IDLE, and RRC_INACTIVE. Under consideration is a plan to use the LP-WUS for RRC_CONNECTED as an instruction for PDCCH monitoring following LP-WUS, and for RRC_IDLE / RRC_INACTIVE as an instruction for paging monitoring following LP-WUS. As shown in FIG. 4, for example, in RRC_IDLE, the LP-WUS is transmitted as information indicating whether or not the PO should be monitored. Furthermore, when the LR receives the LP-WUS and determines that the PO should be monitored, the MR is activated and the subsequent processing is executed.

[0029] The agreement on the scope of application of LP-WUS / LP-WUR in 3GPP Release 19 is shown below.

[0030] To specify a LP-WUS design that is commonly applicable to both RRC_IDLE / RRC_INACTIVE and RRC_CONNECTED modes, an On-Off Keying (OOK) (OOK-1 / OOK-4) based LP-WUS is specified with an OFDM sequence overlaid on top of OOK symbols, supporting at least duty cycle monitoring of the LP-WUS. The LP-WUS design must ensure that the same information is delivered in RRC_IDLE / RRC_INACTIVE mode regardless of the LP-WUS type. The OFDM sequence may carry information.

[0031] For RRC_IDLE / RRC_INACTIVE mode, the following three are agreed upon:

[0032] (Agreement 1) Specifies the procedures and settings for LP-WUS to indicate paging monitoring triggered by LP-WUS. This procedure and settings includes at least the settings, subgrouping, and entry / exit conditions for LP-WUS monitoring. (Agreement 2) For synchronization / Radio Resource Management (RRM) of the serving cell, a low-power synchronization signal (LP-SS) with a periodicity of Y [milliseconds] is specified for the LP-WUR. LP-SS is based on the OOK-1 / OOK-4 waveform, with or without an OFDM sequence overlay. For LP-WURs that can receive existing PSS / SSS, the existing PSS / SSS can be used instead of LP-SS for synchronization and RRM. (Agreement 3) Specifies, including the necessary conditions, that the RRM of the MR of the terminal 20 be further relaxed with measurements on both the serving cell and neighboring cells, and that RRM measurements of the serving cell of the terminal 20 be offloaded from the MR to the LP-WUR.

[0033] In the case of the RRC_CONNECTED mode, it specifies a procedure that includes a procedure for enabling and disabling LP-WUS monitoring, and enables monitoring of the MR PDCCH of the terminal 20 using the LP-WUS as a trigger. In the RRC_CONNECTED mode, the MR UDS of the terminal 20 is not taken into consideration, and measurements of the RRM / Radio Link Monitoring (RLM) / Beam Failure Detection (BFD) / Channel State Information (CSI) of the terminal 20 are performed by the MR.

[0034] The target coverage of LP-WUS and LP-SS shall be the coverage of PUSCH in message 3. Optimization of LP-WUS signal design for RRC_IDLE / RRC_INACTIVE mode takes priority over optimization for RRC_CONNECTED mode.

[0035] 3GPP Release 19 considers a procedure for triggering PDCCH monitoring by LP-WUS in RRC_CONNECTED mode. The LP-WUS in this procedure is, for example, a C-DRX-configured LP-WUS. The following four options are discussed for this procedure:

[0036] FIG. 5 is a diagram (1) showing an example of a procedure in which the LP-WUS triggers PDCCH monitoring. In option 1, as shown in FIG. 5, before triggering the start of the drx-onDurationTimer, the terminal 20 performs LP-WUS monitoring according to the LP-WUS monitoring configuration. Option 1 can be applied to the DCP (DCI format 2_6 with CRC (Cyclic Redundancy Check) scrambled by PS-RNTI (Power Saving - Radio Network Temporary Identifier)) function. Here, the drx-onDurationTimer is one of the parameters of the DRX function and refers to the period during which the terminal 20 performs PDCCH monitoring within the DRX cycle. Furthermore, the DCP refers to a signal transmitted using DCI format 2-6 for controlling the activation of the terminal 20.

[0037] In option 2, to trigger PDCCH monitoring, terminal 20 performs LP-WUS monitoring at least outside the legacy C-DRX active period according to the LP-WUS monitoring configuration, as shown in Fig. 6. In option 2, PDCCH monitoring can be performed regardless of drx-onDurationTimer.

[0038] Figure 6 is a diagram (2) showing an example of a procedure for LP-WUS to trigger PDCCH monitoring. In Option 2-1 related to Option 2, PDCCH monitoring is additionally triggered based on the legacy C-DRX cycle and drx-onDurationTimer during LP-WUS monitoring, as shown in Figure 6. To adopt Option 2-1, it must be configured together with Option 1 to achieve power savings compared to legacy C-DRX.

[0039] Figure 7 is a diagram (3) showing an example of a procedure for an LP-WUS to trigger PDCCH monitoring. In Option 2-2 related to Option 2, as shown in Figure 7, PDCCH monitoring is not triggered by the legacy C-DRX cycle and drx-onDurationTimer during LP-WUS monitoring.

[0040] Figure 8 is a diagram (4) showing an example of a procedure for the LP-WUS to trigger PDCCH monitoring. In option 3, as shown in Figure 8, LP-WUS monitoring is performed at least during the legacy C-DRX active time according to the LP-WUS monitoring configuration for triggering PDCCH monitoring.

[0041] <rlm rlfr> 9 is a diagram showing an example of an RRC re-establishment procedure during RLF. For example, the terminal 20 declares RLF when a wireless problem timer (T301) that was started after a wireless problem instruction from the physical layer expires. Note that if the wireless problem is resolved before the wireless problem timer expires, the terminal 20 stops the wireless problem timer.

[0042] After the RLF is declared, the terminal 20 remains in RRC_CONNECTED in certain cases. Otherwise, in the case of the RLF of the serving cell, or in the case of a Dual Active Protocol Stack (DAPS) handover standardized in 3GPP Release 16, in the case of the RLF of the target cell before releasing the source cell, the terminal 20 selects an appropriate cell and starts a procedure for RRC re-establishment. Note that if an appropriate cell is not found within a certain time after the RLF is declared, the terminal 20 enters RRC_IDLE.

[0043] <bfd bfr> FIG. 10 is a diagram illustrating an example of a BFR procedure for a PCell.

[0044] SSBs that are QCL (Quasi-Co-Location) using periodic CSI-RS (Reference Signal) and PDCCH demodulation reference signal (DMRS: Demodulation Reference Signal) are used for BFD.

[0045] Here, QCL is an index indicating the statistical properties of a channel. For example, if a signal / channel and another signal / channel are in a QCL relationship, it may mean that at least one of the Doppler shift, Doppler spread, average delay, delay spread, spatial parameters (e.g., spatial receive filter / spatial receive parameters), and spatial transmit filter / spatial transmit parameters can be assumed to be the same between these different signals / channels (i.e., they are QCLs with respect to at least one of these).

[0046] The spatial reception parameters may correspond to a reception beam (such as a reception analog beam) of the terminal 20, or the beam may be determined based on a spatial QCL. In the present disclosure, a QCL (or at least one element of a QCL) may be interpreted as a spatial QCL (sQCL). That's fine.

[0047] The terminal 20 triggers BFR by initiating a random access procedure on the PCell. When the random access procedure is completed, the BFR of the PCell is considered to be completed.

[0048] Terminal 20 triggers BFR by starting transmission of a BFR MAC CE (Medium Access Control Element) to an SCell. BFR for the SCell is considered to be completed when a PDCCH indicating an UL grant for a new transmission is received on the HARQ process used to transmit the BFR MAC CE.

[0049] Here, the random access (RA) procedure is classified into a contention-based random access (CBRA) and a contention-free random access (CFRA). In the CBRA, a four-step RA procedure or a two-step RA procedure is performed.

[0050] In the four-step RA procedure, the following four messages are exchanged between the terminal 20 and the base station 10.

[0051] [Step 1] Randomly select an RA preamble and transmit a PRACH (Message 1 from terminal 20 to base station 10) [Step 2] Send a Random Access Response (RAR) (Message 2 from base station 10 to terminal 20) [Step 3] Send a higher layer signal (Message 3 from terminal 20 to base station 10) [Step 4] Transmit control information for RRC connection (Message 4 from base station 10 to terminal 20)

[0052] In the two-step RA procedure, the following two messages are exchanged between the terminal 20 and the base station 10.

[0053] [Step 1] Terminal 20 transmits message A to base station 10, which includes an RA preamble and a PUSCH that transmits predetermined information for initial access (corresponding to message 1 and message 3 described above). [Step 2] The base station 10 transmits message B to the terminal 20 in response to message A (corresponding to messages 2 and 4 described above).

[0054] <Challenges> When considering a case where LP-WUS monitoring / PDCCH monitoring and an RLFR procedure / BFR procedure are performed simultaneously, it has been confirmed in the current discussion that the terminal 20 can trigger RLFR / BFR even while the terminal 20 is performing LP-WUS monitoring without performing PDCCH monitoring. When the terminal 20 triggers RLFR / BFR, the terminal 20 autonomously activates PDCCH monitoring to receive a response to the RLFR / BFR.

[0055] However, while terminal 20 is performing the RLFR procedure / BFR procedure, there is no sufficient consideration as to whether the terminal should perform LP-WUS monitoring. Also, there is no sufficient consideration as to how the terminal should resume LP-WUS monitoring if the terminal falls back to conventional PDCCH monitoring after performing the RLFR procedure / BFR procedure. If LP-WUS monitoring is not performed appropriately during and after the execution of the RLFR procedure / BFR procedure, there is a risk that the terminal will consume unnecessary power due to a deterioration in power efficiency, etc.

[0056] According to this embodiment, the operation relating to terminal monitoring in the wireless communication recovery procedure is clarified.

[0057] An example of this embodiment will be described below. In the following example, the "RLFR / BFR recovery procedure" may be simply called the recovery procedure. [Example]

[0058] The operation of a terminal regarding LP-WUS monitoring / PDCCH monitoring during an RLFR procedure / BFR procedure may be specified.

[0059] Once the terminal 20 initiates the RLFR procedure / BFR procedure, the terminal 20 may assume a predetermined LP-WUS monitoring operation / a predetermined PDCCH monitoring operation in order to receive a predetermined response from the base station 10 during the recovery procedure.

[0060] <Example 1-1> The above-mentioned "predetermined LP-WUS monitoring operation / predetermined PDCCH monitoring" may be one or more of the following methods (Alt: Alternative).

[0061] [Alt. 1] The terminal 20 may continue to monitor the LP-WUS to trigger PDCCH monitoring. [Alt. 2] The terminal 20 may fall back to legacy PDCCH monitoring, that is, the terminal 20 may perform conventional PDCCH monitoring. [Alt.3] The terminal 20 may assume one or more of [Alt.1] to [Alt.2] depending on the implementation of the terminal 20. [Alt.4] Terminal 20 may assume one or more of [Alt.1] to [Alt.3] according to the setting of base station 10. Base station 10 may notify terminal 20 of the setting by system information (SI), RRC, MAC CE, DCI, etc. [Alt.5] The terminal 20 may assume one or more of [Alt.1] to [Alt.4] according to the capabilities of the terminal 20. The terminal 20 may report to the base station 10 that it supports one or more of [Alt.1] to [Alt.4].

[0062] FIG. 11 is a flowchart illustrating an example of the operation of the terminal according to the first embodiment.

[0063] In step S101, terminal 20 starts the RLFR procedure / BFR procedure. In step S102, terminal 20 may execute the above-mentioned Alt.1, may execute the above-mentioned Alt.2, or may execute Alt.3 to Alt.5 for the LP-WUS monitoring operation / PDCCH monitoring operation.

[0064] <Example 1-2> The above-mentioned "predetermined response from the base station 10" may be one or more of the following responses.

[0065] [Alt.1]RLFR response. [Alt. 2] RRC signaling including RRC messages for RLFR. The RRC messages may be, for example, RRCReestablishment / RRCReconfiguration. [Alt.3] BFR response by CBRA. [Alt.4] BFR response by CFRA. [Alt.5] BFR MAC CE response to BFR. [Alt.6] PDCCH / Message 2 / Message 4 / Message B with PDCCH / C(Cell)-RNTI indicating UL grant for BFR MAC CE to respond to BFR.

[0066] <Examples 1-3> In the case of Example 1-1 / Example 1-2, different responses from the base station 10 may perform the same or different LP-WUS monitoring operation / PDCCH monitoring operation.

[0067] For example, terminal 20 may perform LP-WUS monitoring for BFR triggered by BFR MAC CE. For example, terminal 20 may fall back to performing legacy PDCCH monitoring for BFR triggered by CBRA. For example, terminal 20 may perform LP-WUS monitoring for RLFR.

[0068] <Examples 1-4> [Alt.2] in Example 1-1 may be realized as follows.

[0069] (1) Terminal 20 transmits an UL to indicate RLF / BF. The UL may be a PRACH / SR (Scheduling Request) / CG (Configured Grant)-PUSCH / MAC CE, etc. (2) When terminal 20 transmits the UL, terminal 20 falls back to perform PDCCH monitoring. The PDCCH monitoring may be performed based on the C-DRX configuration or may be performed regardless of the C-DRX configuration. "The PDCCH monitoring is performed regardless of the C-DRX configuration" may mean "the PDCCH monitoring is performed at all times." Note that "C-DRX is configured" may mean that predetermined parameters related to the DRX function are configured. The "predetermined parameters related to the DRX function" may be, for example, at least one of drx-Config, drx-ConfigExt, drx-ConfigExt2, drx-ConfigSecondaryGroup, drx-ConfigSL, drx-ConfigPTM, etc.

[0070] As in the configuration of the first embodiment, by controlling the monitoring operation of the terminal during the recovery procedure, it is possible to achieve both power efficiency of the terminal and reliability of communication. [Example]

[0071] The operation of a terminal relating to LP-WUS monitoring / PDCCH monitoring after an RLFR procedure / BFR procedure may be specified.

[0072] <Example 2-1> After the RLFR procedure is completed / after the BFR procedure is completed, the terminal 20 may perform one or more of the following operations in LP-WUS monitoring / PDCCH monitoring.

[0073] [Alt. 1] It may be assumed that the terminal 20 performs LP-WUS monitoring to trigger PDCCH monitoring. [Alt. 2] Terminal 20 may assume PDCCH monitoring as a legacy. That is, terminal 20 may assume conventional PDCCH monitoring. The PDCCH monitoring may be performed based on the C-DRX configuration or may be performed without the C-DRX configuration. "The PDCCH monitoring is performed without the C-DRX configuration" may mean "the PDCCH monitoring is always performed." Note that "C-DRX is configured" may mean that predetermined parameters related to the DRX function are configured. The "predetermined parameters related to the DRX function" may be, for example, at least one of drx-Config, drx-ConfigExt, drx-ConfigExt2, drx-ConfigSecondaryGroup, drx-ConfigSL, drx-ConfigPTM, etc. [Alt. 3] The terminal 20 may assume the same behavior as during the recovery procedure. For example, if the terminal 20 monitors the PDCCH as legacy during the recovery procedure, the terminal 20 may continue to monitor the PDCCH as legacy after the recovery procedure. For example, if the terminal 20 monitors the LP-WUS during the recovery procedure, the terminal 20 may continue to monitor the LP-WUS after the recovery procedure. [Alt.4] The terminal 20 may assume one or more of [Alt.1] to [Alt.3] depending on the implementation of the terminal 20. [Alt. 5] Terminal 20 may assume one or more of [Alt. 1] to [Alt. 4] according to the setting of base station 10. Base station 10 may notify terminal 20 of the setting by SI / RRC / MAC CE / DCI, etc. [Alt.6] The terminal 20 may assume one or more of [Alt.1] to [Alt.5] according to the capabilities of the terminal 20. The terminal 20 may report to the base station 10 that it supports one or more of [Alt.1] to [Alt.5].

[0074] FIG. 12 is a flowchart illustrating an example of the operation of the terminal according to the embodiment 2-1.

[0075] In step S201, terminal 20 completes the RLFR procedure / BFR procedure. In step S202, terminal 20 may execute Alt.1, Alt.2, Alt.3, or Alt.4 to Alt.6 for the LP-WUS monitoring operation / PDCCH monitoring operation.

[0076] <Example 2-2> The terminal 20 may perform LP-WUS monitoring after the recovery procedure if the measured channel conditions are good enough.

[0077] The "measured channel condition" may be, for example, Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Received Signal Strength Indicator (RSSI), Signal to Interference plus Noise Ratio (SINR), or other metrics.

[0078] The "measured channel condition is good enough" may mean, for example, that the channel condition measured by MR / LR using LP-SS / LP-WUS / LP-WUS preamble / CSI-RS exceeds a predetermined threshold, which may be predefined in a specification, configured in SIB / RRC, or indicated by MAC CE / DCI.

[0079] FIG. 13 is a flowchart illustrating an example of the operation of the terminal according to the embodiment 2-2.

[0080] In step S301, the terminal 20 completes the RLFR procedure / BFR procedure. In step S302, the terminal 20 determines whether the channel condition measured by the terminal 20 is good or not. If the channel condition measured by the terminal 20 is good (step S303: Yes), the terminal 20 may perform LP-WUS monitoring. On the other hand, if the channel condition measured by the terminal 20 is not good (step S304: No), the terminal 20 may not perform LP-WUS monitoring.

[0081] As in Example 2-2, by using a configuration in which the resumption of LP-WUS monitoring is determined based on the channel state, it is possible to dynamically optimize the balance between communication quality and power saving.

[0082] <Example 2-3> If the LP-WUS monitoring operation / PDCCH monitoring operation is different during and after the recovery procedure, the terminal 20 may assume that the LP-WUS monitoring operation / PDCCH monitoring operation will be applied from the next one or more offsets onwards.

[0083] [Alt.1] Offset n1 after RLFR completion. [Alt. 2] Offset n2 after the terminal 20 receives a predetermined RRC message or after the terminal 20 transmits a predetermined RRC message. The received predetermined RRC message may be, for example, RRCReestablishment / RRCReconfiguration. The transmitted predetermined RRC message may be, for example, RRCReestablishmentComplete / RRCReconfigurationComplete. [Alt.3] Offset n3 after BFR completion. [Alt.4] Offset n4 after completion of CBRA procedure / CFRA procedure for BFR completion. [Alt.5] Offset n5 after terminal 20 receives PDCCH / Message 2 / Message 4 / Message B with PDCCH / C-RNTI indicating an UL grant to respond to BFR. [Alt.6] Offset n6 after the terminal 20 transmits an acknowledgment (HARQ-ACK: Hybrid Automatic Repeat reQuest - ACKnowledgement) for the PDSCH carrying the BFR response. [Alt.7] Offset n7 after which the terminal 20 acquires measurement metrics related to the channel state after the recovery procedure.

[0084] FIG. 14 is a diagram illustrating an example of the operation of the terminal according to the embodiment 2-3.

[0085] After the RLFR procedure / BFR procedure is triggered by the terminal 20, the terminal 20 performs PDCCH monitoring as a legacy in the RLFR procedure / BFR procedure. After the RLFR procedure / BFR procedure is completed, the terminal 20 applies the Alt.1 or Alt.3 offset and switches to LP-WUS monitoring.

[0086] The offsets n1 to n7 may be in units of seconds, milliseconds, radio frames, radio frame numbers (SFN: System Frame Number), subframes, slots, or symbols.

[0087] The offsets n1 to n7 may be integers equal to or greater than 0. When the offsets n1 to n7 are 0, this may mean that the offsets are not specified. The offsets n1 to n7 may be specified in advance by the base station 10, or may be specified in advance in accordance with the subcarrier spacing.

[0088] In the base station configuration in the above-mentioned Example 2-1 / Example 2-2 / Example 2-3, the base station configuration may be transmitted in RRC / SI / DCI / MAC CE, and may be indicated before / during / after the recovery procedure.

[0089] For example, the base station configuration in the above-described Example 2-1 / Example 2-2 / Example 2-3 may be transmitted on the PDCCH to respond to the BFR initiated by the CBRA / CFRA / BFR MAC CE. For example, the base station configuration in the above-described Example 2-1 / Example 2-2 / Example 2-3 may be transmitted on the RRC of RLFR.

[0090] As in Example 2-3, by configuring to set an offset related to the monitoring method switching after the completion of the recovery procedure, it is possible to realize optimal monitoring control according to the network status and requirements.

[0091] As described above, the operation of the terminal after the completion of the recovery procedure as in the second embodiment makes it possible to maintain the reliability of communication while achieving both efficient use of resources and power saving of the terminal.

[0092] <Device configuration> An example of the functional configuration 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 implementing the above-described embodiments. However, the base station 10 and the terminal 20 may each include only a part of the functions of the embodiments.

[0093] ≪Base station≫ Fig. 15 is a diagram showing an example of the functional configuration of a base station. 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. 15 is merely an example. The functional divisions and names of the functional units may be any names as long as they can perform the operations according to this embodiment.

[0094] The transmitter 110 includes a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The transmitter 110 also transmits setting information, instructions, notifications, etc. related to a low-power wake-up signal to the terminal 20. The transmitter 110 also transmits notifications related to switching of monitoring operations to the terminal. The receiver 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of higher layers from the received signals. The transmitter 110 also has a function of transmitting PSS, SSS, PBCH, DL / UL control signals, etc. to the terminal 20. The receiver 120 also receives inter-network node messages from other network nodes.

[0095] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20. The content of the setting information is, for example, information related to measurements of low-power signals.

[0096] As described in the embodiments, the control unit 140 controls settings, instructions, and notifications related to the LP-WUS, etc. A functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and a functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120.

[0097] Terminal Fig. 16 is a diagram showing an example of the functional configuration of a terminal. 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. 16 is merely an example. As long as the operation according to this embodiment can be performed, the names of the functional divisions and functional units may be any. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

[0098] The transmitter 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The transmitter 210 also transmits capability information related to the LP-WUS to the base station 10. The receiver 220 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals. The receiver 220 also has a function of receiving PSS, SSS, PBCH, DL / UL / SL control signals, etc. transmitted from the base station 10. The receiver 220 also receives paging notification information and configuration information, instructions, and notifications related to the LP-WUS from the base station 10. For example, the receiver 220 receives an LP-WUS from the base station 10. The configuration unit 230 stores various configuration information received by the receiver 220 from the base station 10. The configuration unit 230 also stores pre-configured configuration information. The configuration information includes, for example, information related to measurements in the LP-WUS.

[0099] As described in the embodiments, the control unit 240 controls settings, instructions, and notifications related to the LP-WUS. The control unit 240 may determine whether to monitor the LP-WUS. The control unit 240 may monitor the LP-WUS. The control unit 240 may not assume that LP-WUS monitoring will be set. The control unit 240 may detect the LP-WUS by monitoring the LP-WUS. A functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and a functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220.

[0100] <Hardware configuration> The block diagrams (FIGS. 15 and 16) 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 connected directly or indirectly (for example, by wire, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining the single device or the multiple devices with software.

[0101] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs a transmission function is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0102] 17 is a diagram showing an example of the hardware configuration of a base station and a terminal. For example, the base station 10, the terminal 20, etc. in this embodiment may function as a computer that performs processing of the wireless communication method of this embodiment. The above-mentioned base station 10 and the terminal 20 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.

[0103] In the following description, the term "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0104] Each function in the base station 10 and the terminal 20 is realized by loading predetermined 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.

[0105] The processor 1001 controls the entire computer by running, for example, an operating system (OS). 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.

[0106] Furthermore, the processor 1001 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. 15 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. 16 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 be transmitted from a network via a telecommunications line.

[0107] 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 ROM (EPROM), an electrically erasable programmable ROM (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.

[0108] 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 disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0109] The communication device 1004 is hardware (transmitting / receiving 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, or a communication module. The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of FDD and TDD. For example, a transmitting / receiving antenna, an amplifier unit, a transmitting / receiving unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmitting / receiving unit may be implemented as a transmitting unit and a receiving unit that are physically or logically separated.

[0110] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED (Light-Emitting Diode) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0111] 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.

[0112] Furthermore, base station 10 and 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, processor 1001 may be implemented using at least one of these pieces of hardware.

[0113] 18 is a diagram showing an example of the configuration of a vehicle. A 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.

[0114] 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.

[0115] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (I / O (Input / Output) 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).

[0116] 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 front or rear wheel rotation speed signal obtained by a rotation speed sensor 2022, a front or rear wheel air pressure signal 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.

[0117] 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 (outputting) 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 uses information acquired from external devices via the communication module 2013 or the like to provide various types of multimedia information and multimedia services to the occupants of the vehicle 2001. The information service unit 2012 may include input devices (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accept input from the outside, and may also include output devices (e.g., a display, a speaker, an LED lamp, a touch panel, etc.) that output information to the outside.

[0118] The driving assistance system unit 2030 is configured with various devices that provide functions for preventing accidents and reducing the driver's driving burden, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS (Global Navigation Satellite System)), map information (e.g., HD (High Definition) maps, autonomous vehicle (AV) maps), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System)), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 2030 also transmits and receives various information via the communication module 2013 to realize driving assistance functions or autonomous driving functions.

[0119] 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.

[0120] 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.

[0121] The communication module 2013 may transmit at least one of signals from the above-mentioned various sensors 2021-2028 input to the electronic control unit 2010, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 2012 to an external device via wireless communication. The electronic control unit 2010, the various sensors 2021-2028, the information service unit 2012, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above-mentioned input.

[0122] The communication module 2013 receives various information (traffic information, traffic signal information, vehicle-to-vehicle information, etc.) transmitted from external devices and displays it on an information service unit 2012 provided in the vehicle 2001. The information service unit 2012 may be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 2013). The communication module 2013 also stores the various information received from 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.

[0123] For example, aspects of the present invention are as follows.

[0124] <1> a transmitter for transmitting a signal related to a request for recovery from a radio link failure or a beam failure; a receiving unit that receives a predetermined response to the request; A terminal having a control unit that performs predetermined monitoring based on the execution timing of the recovery. <2> the control unit monitors for a low power wake-up signal while the recovery is being performed. <1> A terminal described in. <3> the control unit monitors a physical downlink control channel while the recovery is being performed. <1> or <2> A terminal described in. <4> the control unit performs monitoring for a low-power wake-up signal after the recovery is completed. <1> from <3> 10. A terminal according to claim 9, wherein: <5> the control unit performs monitoring of a physical downlink control channel after the recovery is completed. <1> from <4> 10. A terminal according to claim 9, wherein: <6> transmitting a signal related to a request for recovery from a radio link failure or beam failure; receiving a predetermined response to said request; and performing predetermined monitoring based on the execution timing of the recovery.

[0125] Any of the above configurations can clarify the operation related to terminal monitoring in the wireless communication recovery procedure, thereby maintaining the reliability of communication.

[0126] <Supplementary information on the embodiment> Although the present embodiment has been described above, the disclosed invention is not limited to such an embodiment, 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 (unless inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to the 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 the 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. However, such devices may be implemented using hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to this embodiment and the software operated by the processor of the terminal 20 according to this embodiment may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

[0127] 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., DCI, UCI (Uplink Control Information)), higher layer signaling (e.g., RRC signaling, MAC signaling), broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. Information notified by higher layer signaling may be referred to as configuration information. Information notified by physical layer signaling may be referred to as control information. Furthermore, 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.

[0128] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR, W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or other suitable systems, and next-generation systems extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G) may also be applied.

[0129] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be changed 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.

[0130] In this specification, a specific operation that is described as being performed by the base station 10 may also 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 (Mobility Management Entity) or an S-GW (Serving Gateway)). 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 (for example, an MME and an S-GW).

[0131] 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.

[0132] 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.

[0133] 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).

[0134] 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.

[0135] 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.

[0136] 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.

[0137] Note that terms explained 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). A signal may also be a message. A CC may also be called a carrier frequency, a cell, a frequency carrier, etc.

[0138] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0139] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or other corresponding information. For example, a radio resource may be indicated by an index.

[0140] 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.

[0141] In the present disclosure, terms such as "base station (BS)," "radio base station," "base station device," "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. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0142] 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 divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0143] In the present disclosure, the base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control or operate based on the information.

[0144] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0145] 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.

[0146] 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 object, the mobile object itself, etc. The mobile object refers to a movable object, and may move at any speed. Naturally, this also includes cases where the mobile object is stationary. Examples of the mobile object include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and objects mounted thereon. The mobile object may also be a mobile object that moves autonomously based on an operational command. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (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 be a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0147] 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 a plurality of terminals 20 (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). 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.

[0148] 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.

[0149] 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.

[0150] 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 at least one of one or more wires, cables, and 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.

[0151] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0152] 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."

[0153] 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.

[0154] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0155] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0156] 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.

[0157] Numerology may be communication parameters applied to at least one of transmission and 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, and specific windowing operations performed by the transceiver in the time domain.

[0158] A slot may be composed of one or more symbols (such as OFDM symbols or SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols) in the time domain. A slot may be a time unit based on numerology.

[0159] 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.

[0160] 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.

[0161] 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 millisecond [ms]) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Releases 8 to 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 TTI (partial or fractional TTI), shortened subframe, short subframe, minislot, subslot, slot, etc.

[0166] 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 equal to or greater than 1 ms.

[0167] A resource block (RB) is a resource allocation unit in the time domain and 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 numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0168] 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.

[0169] Note that one or more RBs may also be called a physical resource block (PRB), a subcarrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0170] 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.

[0171] A Bandwidth Part (BWP) (which may also be referred to as a partial bandwidth) may represent a subset of contiguous common RBs for a given numerology on a given carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within the BWP.

[0172] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0173] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0174] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, 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. may be changed in various ways.

[0175] 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.

[0176] 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."

[0177] In this disclosure, the term "doing B according to A" may also mean "doing B based on A."

[0178] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0179] 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. [Explanation of symbols]

[0180] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 terminals 210 Transmitter 220 Receiving unit 230 Setting Section 240 Control Unit 1001 processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication equipment 1005 Input Device 1006 Output Device 2001 Vehicle 2002 Drive unit 2003 Steering Section 2004 accelerator pedal 2005 brake pedal 2006 Shift Lever 2007 front wheel 2008 rear wheel 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 RPM Sensor 2023 Air 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 Systems Department 2031 microprocessor 2032 memory (ROM, RAM) 2033 Communication port (I / O port)< / bfd> < / rlm>

Claims

1. a transmitter for transmitting a signal related to a request for recovery from a radio link failure or a beam failure; a receiving unit that receives a predetermined response to the request; A terminal having a control unit that performs predetermined monitoring based on the execution timing of the recovery.

2. The terminal of claim 1 , wherein the control unit monitors for a low-power wake-up signal while the recovery is being performed.

3. The terminal according to claim 1 , wherein the control unit monitors a physical downlink control channel while the recovery is being performed.

4. The terminal of claim 1 , wherein the control unit performs monitoring for a low-power wake-up signal after the recovery is completed.

5. The terminal according to claim 1 , wherein the control unit performs monitoring of a physical downlink control channel after the recovery is completed.

6. transmitting a signal related to a request for recovery from a radio link failure or beam failure; receiving a predetermined response to said request; and performing predetermined monitoring based on the execution timing of the recovery.

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