Terminal and communication method

Abstract

A terminal is provided with: a reception unit that receives, from a base station, first downlink control information in which an uplink is not scheduled or second downlink control information in which an uplink is scheduled; a control unit that switches a waveform applied to uplink transmission on the basis of the first downlink control information or the second downlink control information; and a transmission unit that has a transmission unit that transmits the uplink transmission to the base station, and the control unit sets an effective period during which a waveform of the uplink transmission is switched.

Description

Technical Field

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

[0002] In NR (New Radio) (also called "5G"), which is the successor system to LTE (Long Term Evolution), technologies that meet the requirements such as large-capacity systems, high data transmission speeds, low latency, simultaneous connection of multiple terminals, low costs, and power saving are being studied (for example, non-patent document 1).

[0003] In addition, in 3GPP (registered trademark) version 18, further enhancement of coverage is studied (for example, non-patent document 2). For example, coverage enhancement of PRACH (Physical random access channel) is studied. In addition, for example, enhancements in the power domain such as increasing the upper limit of UE power in CA (Carrier Aggregation) or DC (Dual Connectivity) are studied. In addition, for example, dynamic waveform switching of DFT-S-OFDM (Discrete Fourier Transform-Spread-OFDM) and CP-OFDM (Cyclic-Prefix OFDM) is studied.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS 38.300 V17.2.0 (2022-09)

[0007] Non-Patent Document 2: “Revised WID on Further NR coverage enhancements”, RP-221858, 3GPP TSG RAN Meeting #96, 3GPP, June 2022

[0008] Non-patent document 3: 3GPP TS 38.214 V17.3.0 (2022-09) Summary of the invention

[0009] Problems to be solved by the invention

[0010] The details of the control for performing dynamic waveform switching by not scheduling uplink DCI (Downlink Control Information) are unclear.

[0011] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to dynamically switch waveforms in a wireless communication system.

[0012] Means for solving problems

[0013] According to the disclosed technology, a terminal is provided, which comprises: a receiving unit, which receives the first downlink control information that does not schedule an uplink or the second downlink control information that schedules an uplink from a base station; a control unit, which switches a waveform applied to an uplink transmission based on the first downlink control information or the second downlink control information; and a sending unit, which comprises a sending unit that sends the uplink transmission to the base station, and the control unit sets a valid period for switching the waveform of the uplink transmission.

[0014] Effects of the Invention

[0015] According to the disclosed technology, in a wireless communication system, waveforms can be switched dynamically. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram showing a configuration example (1) of a wireless communication system.

[0017] Figure 2 This is a diagram showing a configuration example (2) of a wireless communication system.

[0018] Figure 3 This is a diagram for explaining example (1) of dynamic waveform switching according to an embodiment of the present invention.

[0019] Figure 4 This is a diagram for explaining example (2) of dynamic waveform switching according to an embodiment of the present invention.

[0020] Figure 5 It is a diagram showing an example of the functional configuration of the base station 10 according to the embodiment of the present invention.

[0021] Figure 6 It is a diagram showing an example of the functional configuration of the terminal 20 according to the embodiment of the present invention.

[0022] Figure 7 This is a diagram showing an example of the hardware configuration of the base station 10 or the terminal 20 according to the embodiment of the present invention.

[0023] Figure 8 1 is a diagram showing an example of the structure of a vehicle 2001 in the embodiment of the present invention. DETAILED DESCRIPTION

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0025] In the operation of the wireless communication system of the embodiment of the present invention, existing technologies are appropriately used. The existing technologies are, for example, existing LTE, but are not limited to existing LTE. In addition, unless otherwise specified, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and subsequent methods (e.g., NR) of LTE-Advanced.

[0026] In addition, in the embodiments of the present invention described below, the terms 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), PUSCH (Physical Uplink Shared Channel), etc. used in the existing LTE are used. These are for the convenience of recording, and the same signals, functions, etc. may also be referred to by other names. In addition, the above terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even signals used for NR are not necessarily clearly recorded as "NR-".

[0027] Furthermore, in the embodiments of the present invention, the duplexing method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or other methods (for example, Flexible Duplex, etc.).

[0028] In addition, in the embodiment of the present invention, “configuring” wireless parameters and the like may be pre-configuring predetermined values, or may be configuring wireless parameters notified from the base station 10 or the terminal 20 .

[0029] Figure 1 FIG. 1 is a diagram showing a configuration example (1) of a wireless communication system in an embodiment of the present invention. Figure 1 As shown, the wireless communication system in the embodiment of the present invention includes a base station 10 and a terminal 20. Figure 1 In the figure, one base station 10 and one terminal 20 are shown, but this is an example and a plurality of base stations 10 and a plurality of terminals 20 may be provided.

[0030] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of the wireless signal are defined in the time domain and the frequency domain. The time domain can be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain can be defined by the number of subcarriers or the number of resource blocks. The base station 10 sends a synchronization signal and system information to the terminal 20. Synchronization signals are, for example, NR-PSS and NR-SSS. System information is sent, for example, through NR-PBCH, and is also called broadcast information. The synchronization signal and system information may also be referred to as SSB (SS / PBCH block). As Figure 1 As shown, the base station 10 sends a control signal or data to the terminal 20 via DL (Downlink), and receives a control signal or data from the terminal 20 via UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to send and receive signals. In addition, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output)-based communications to DL or UL. In addition, the base station 10 and the terminal 20 can also communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) based on CA (Carrier Aggregation). Furthermore, the terminal 20 can also communicate via the primary cell of the base station 10 based on DC (Dual Connectivity) and the primary and secondary cell group cells (PSCell: Primary SCG Cell) of other base stations 10.

[0031] The terminal 20 is a communication device having a wireless communication function, such as a smart phone, a mobile phone, a tablet computer, a wearable terminal, or an M2M (Machine-to-Machine) communication module. Figure 1 As shown, the terminal 20 receives a control signal or data from the base station 10 via DL and transmits a control signal or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. In addition, the terminal 20 receives various reference signals transmitted from the base station 10 and performs measurement of propagation path quality based on the reception result of the reference signal.

[0032] The terminal 20 can perform carrier aggregation to bundle multiple cells (multiple CCs) and communicate with the base station 10. In carrier aggregation, one PCell (Primary cell) and one or more SCells (Secondary cells) are used. Alternatively, a PUCCH-SCell having a PUCCH may be used.

[0033] Figure 2 This is a diagram showing example (2) of a wireless communication system in an embodiment of the present invention. Figure 2 FIG. 2 shows a configuration example of a wireless communication system in which DC (Dual Connectivity) is performed. Figure 2 As shown, a base station 10A serving as a MN (Master Node) and a base station 10B serving as a SN (Secondary Node) are provided. The base station 10A and the base station 10B are connected to a core network respectively. The terminal 20 can communicate with both the base station 10A and the base station 10B.

[0034] The cell group provided by the base station 10A as the MN is called MCG (Master Cell Group), and the cell group provided by the base station 10B as the SN is called SCG (Secondary Cell Group). In addition, in DC, MCG is composed of 1 PCell and one or more SCells, and SCG is composed of 1 PSCell (Primary SCG Cell) and one or more SCells.

[0035] The processing actions in this embodiment can be performed by Figure 1 The system structure shown can also be implemented by Figure 2 The present invention may be executed by the system configuration shown in the figure, or may be executed by system configurations other than these.

[0036] In 3GPP Release 18, further enhancement of coverage was studied (e.g., Non-Patent Document 2). For example, coverage enhancement of PRACH (Physical random access channel) was studied. In addition, for example, enhancements in the power domain such as increasing the upper limit of UE power in CA (Carrier Aggregation) or DC (Dual Connectivity) were studied. In addition, for example, dynamic waveform switching of DFT-S-OFDM (Discrete Fourier Transform-Spread-OFDM) and CP-OFDM (Cyclic-Prefix OFDM) was studied.

[0037] Both CP-OFDM and DFT-S-OFDM are supported for NR PUSCH. The waveform switching is performed through RRC signaling.

[0038] CP-OFDM can flexibly allocate frequency resources. For example, it allows continuous PRB configuration and discontinuous PRM configuration. PRB allocation is not limited to multiples of 2, 3, and 5. In addition, DMRS and PUSCH are frequency multiplexed.

[0039] On the other hand, DFT-S-OFDM can achieve lower PAPR, which is advantageous for power-limited UEs.

[0040] Typically, the network switches between the two waveforms based on the SNR (Signal-to-noise ratio). However, switching requires RRC reconfiguration.

[0041] Therefore, dynamic waveform switching can be performed using notification based on DCI that schedules UL. In addition, dynamic waveform switching can also be performed using notification based on DCI that does not schedule UL.

[0042] Figure 3 1 is a diagram for explaining example (1) of dynamic waveform switching according to an embodiment of the present invention. In step S101, the terminal 20 receives DCI that does not include UL scheduling information from the base station 10. In the next step S102, the terminal 20 dynamically switches the waveform applied to UL transmission based on the DCI. In the next step S103, the terminal 20 applies the switched waveform and performs UL transmission to the base station 10.

[0043] When only DG (Dynamic grant: dynamic authorization)-PUSCH is considered, dynamic waveform switching based on notification of DCI for scheduling UL is sufficient. On the other hand, when considering CG (Configured grant: configured authorization)-PUSCH, it is necessary to consider dynamic waveform switching based on notification of DCI for non-scheduled UL, and further, dynamic waveform switching based on notification of DCI for scheduling UL can also be considered.

[0044] When DCI that does not schedule UL is used for dynamic waveform switching, the following 1)-4) need to be studied.

[0045] 1) Which type of DCI is used for dynamic waveform switching.

[0046] 2) Which PUSCH is the target of the dynamic waveform switching notification, for example, is only the CG-PUSCH the target or is the DG-PUSCH also the target?

[0047] 3) Set notification of when and to what extent dynamic waveform switching is enabled.

[0048] 4) How to make the assumptions of the waveforms used between the base station 10 and the terminal 20 consistent.

[0049] Therefore, actions 1) to 4) described below may be performed.

[0050] Action 1) Dynamic waveform switching based on notification contained in the DCI format of not scheduling UL may be supported.

[0051] The above-mentioned DCI format not scheduling UL can be any one of 1)-8) shown below.

[0052] 1) DCI format 1_1 or 1_2, that is, DCI for scheduling DL transmission.

[0053] 2) DCI format 1_0. That is, DCI that schedules DL transmission or triggers PDCCH command random access.

[0054] 3) Activate or release DL-SPS (Semipersistent scheduling) or type 2 CG-PUSCH DCI format.

[0055] 4) DCI format 2_x, that is, group common DCI.

[0056] 5) DCI format 3_x, that is, DCI for the scheduling side link.

[0057] 6) DCI format 4_x: That is, DCI for scheduling multicast or broadcast PDSCH.

[0058] 7) DCI format 0_x. That is, DCI for scheduling UL transmission. 7) can be excluded in action 1) and can be applied in actions 2) to 4).

[0059] 8) DCI format with CRC scrambled by a new RNTI (Radio Network Temporary Identifier).

[0060] In addition, the above-mentioned DCI may not schedule any data transmission or data reception. For example, in the case where the DCI does not schedule DL or UL data and the feedback of the DCI is reported by the UE, and in the case where the type 2 HARQ-ACK codebook is set, the DCI may include at least a DAI (Downlink Assignment Index: Downlink Assignment Index) field.

[0061] Dynamic waveform switching can be performed by the methods 1)-5) shown below.

[0062] 1) When using DCI format 1_1 or 1_2 for scheduling DL, dynamic waveform switching can be notified as shown in a)-d) below.

[0063] a) Add 1 bit to notify the waveform. For example, 0 may indicate the use of CP-OFDM, and 1 may indicate the use of DFT-S-OFDM.

[0064] b) Adding 1 bit to notify that the waveform is switched from the immediately previous waveform For example, when 1 bit indicates a toggle and is 1, it can indicate switching from the immediately previous waveform.

[0065] c) Add 1 bit to indicate whether the waveform set by RRC signaling is set or a different waveform is set. For example, when CP-OFDM is set by RRC signaling (i.e., when the transform precoder is invalid), 0 can notify the use of CP-OFDM (i.e., the same waveform as set by RRC signaling), and 1 can notify the use of DFT-S-OFDM (i.e., different waveform from that set by RRC signaling).

[0066] d) Setting the existing notification to a predetermined value to notify the dynamic waveform switching. For example, the existing notification may be MCS (Modulation and coding scheme), FDRA (Frequency domain resource assignment), rank number, or antenna port. For example, when the MCS is less than a predetermined threshold, DFT-S-OFDM may be used even if CP-OFDM is set. For example, when the rank number is 1, DFT-S-OFDM may be used even if CP-OFDM is set.

[0067] In addition, a transform precoder may be set for Msg3-PUSCH and / or CG-PUSCH and / or DG-PUSCH.

[0068] In addition, the dynamic waveform switching based on the above 1) in action 2) can be applied only to predetermined PUSCHs, for example, to PUSCHs that are not repeatedly transmitted, to PUSCHs that are repeatedly transmitted, and to PUSCHs with high or low L1 priority.

[0069] 2) When using DCI format 1_0 that triggers a PDCCH command random access, dynamic waveform switching can be notified as shown in a) to d) below.

[0070] a) Add 1 bit to notify the waveform. For example, 0 may indicate the use of CP-OFDM, and 1 may indicate the use of DFT-S-OFDM.

[0071] b) Adding 1 bit to notify that the waveform is switched from the immediately previous waveform For example, when 1 bit indicates a toggle and is 1, it can indicate switching from the immediately previous waveform.

[0072] c) Add 1 bit to indicate whether the waveform set by RRC signaling is set or a different waveform is set. For example, when CP-OFDM is set by RRC signaling (i.e., when the transform precoder is invalid), 0 can notify the use of CP-OFDM (i.e., the same waveform as set by RRC signaling), and 1 can notify the use of DFT-S-OFDM (i.e., different waveform from that set by RRC signaling).

[0073] d) Setting the existing notification to a predetermined value to notify the dynamic waveform switching. For example, the existing notification may be a random access preamble index.

[0074] In addition, one bit in the above a)-c) can be reused as a reserved bit.

[0075] In addition, a transform precoder may be set for Msg3-PUSCH and / or CG-PUSCH and / or DG-PUSCH.

[0076] In addition, the dynamic waveform switching based on the above 2) in action 2) can be applied only to a predetermined PUSCH, for example, to a PUSCH that is not repeatedly transmitted, to a PUSCH that is repeatedly transmitted, or to a PUSCH with a high or low L1 priority.

[0077] 3) In case of using DCI to activate or release DL-SPS or Type 2 CG-PUSCH, dynamic waveform switching may be notified as shown in a) to d) below.

[0078] a) Add 1 bit to notify the waveform. For example, 0 may indicate the use of CP-OFDM, and 1 may indicate the use of DFT-S-OFDM.

[0079] b) Adding 1 bit to notify that the waveform is switched from the immediately previous waveform For example, when 1 bit indicates a toggle and is 1, it can indicate switching from the immediately previous waveform.

[0080] c) Add 1 bit to indicate whether the waveform set by RRC signaling is set or a different waveform is set. For example, when CP-OFDM is set by RRC signaling (i.e., when the transform precoder is invalid), 0 can notify the use of CP-OFDM (i.e., the same waveform as set by RRC signaling), and 1 can notify the use of DFT-S-OFDM (i.e., different waveform from that set by RRC signaling).

[0081] d) Setting the existing notification to a predetermined value to notify the dynamic waveform switching. For example, the existing notification may be MCS, FDRA, rank number, or antenna port. For example, when the MCS is less than a predetermined threshold, DFT-S-OFDM may be used even if CP-OFDM is set. For example, when the rank number is 1, DFT-S-OFDM may be used even if CP-OFDM is set.

[0082] In addition, a transform precoder may be set for Msg3-PUSCH and / or CG-PUSCH and / or DG-PUSCH.

[0083] In addition, the dynamic waveform switching based on the above 3) in action 2) can be applied only to predetermined PUSCHs, for example, to PUSCHs that are not repeatedly transmitted, to PUSCHs that are repeatedly transmitted, and to PUSCHs with high or low L1 priority.

[0084] 4) In case of using DCI fields defining specific conditions and / or DCI 0_x and / or 1_x accompanied by RNTI, dynamic waveform switching can be notified as shown below.

[0085] In case the UE detects at least one of the conditions a)-f) shown below, it can verify that the DCI is a notification of dynamic waveform switching.

[0086] a) Predetermined restrictions on RNTI, for example, when the CRC is scrambled by the CS-RNTI.

[0087] b) A predetermined value of FDRA, for example, all bits are 0 or all bits are 1.

[0088] c) A predetermined value of the HARQ process number, for example, a case where all bits are 0.

[0089] d) A predetermined value of the redundancy version, for example, when all bits are 0.

[0090] e) Predetermined value of MCS, for example, when all bits are 1.

[0091] f) A predetermined value of NDI, for example, when all bits are 0.

[0092] In addition, a transform precoder may be set for Msg3-PUSCH and / or CG-PUSCH and / or DG-PUSCH.

[0093] In addition, the dynamic waveform switching based on the above 4) in action 2) can be applied only to a predetermined PUSCH, for example, to a PUSCH that is not repeatedly transmitted, to a PUSCH that is repeatedly transmitted, or to a PUSCH with a high or low L1 priority.

[0094] In addition, when the carrier indicator, the UL / SUL indicator, or the BWP indicator is notified through the DCI, it can be assumed that dynamic waveform switching is notified.

[0095] 5) When using DCI with CRC scrambled by a new RNTI, dynamic waveform switching can be notified as shown in a)-d) below.

[0096] a) Add 1 bit to notify the waveform. For example, 0 may indicate the use of CP-OFDM, and 1 may indicate the use of DFT-S-OFDM.

[0097] b) Adding 1 bit to notify that the waveform is switched from the immediately previous waveform For example, when 1 bit indicates a toggle and is 1, it can indicate switching from the immediately previous waveform.

[0098] c) Add 1 bit to indicate whether the waveform set by RRC signaling is set or a different waveform is set. For example, when CP-OFDM is set by RRC signaling (i.e., when the transform precoder is invalid), 0 can notify the use of CP-OFDM (i.e., the same waveform as set by RRC signaling), and 1 can notify the use of DFT-S-OFDM (i.e., different waveform from that set by RRC signaling).

[0099] d) Instead of adding 1 bit to the DCI, the new RNTI itself may indicate a waveform different from the waveform set by RRC signaling, or may indicate a waveform different from the immediately previous waveform.

[0100] In addition, a transform precoder may be set for Msg3-PUSCH and / or CG-PUSCH and / or DG-PUSCH.

[0101] In addition, when the carrier indicator, the UL / SUL indicator, or the BWP indicator is notified through the DCI, it can be assumed that dynamic waveform switching is notified.

[0102] For example, the UE may perform actions as shown in a)-c) below.

[0103] a) When the UE detects a 1-bit DCI 1_1 for dynamic waveform switching, the UE can determine the waveform to be used for PUSCH transmission based on the 1 bit. For example, when the 1 bit is 0, the waveform can be set to the waveform set by RRC signaling, and when the 1 bit is 1, the waveform can be switched to a waveform different from the waveform set by RRC signaling.

[0104] b) When the UE detects DCI1_0 that triggers a PDCCH command for random access and includes a predetermined random access preamble index, the UE may switch the waveform to a waveform different from the waveform set by RRC signaling.

[0105] c) When the UE detects DCI 1_1 with a CRC scrambled by a new RNTI, it can determine the waveform to be applied to PUSCH transmission based on the notified 1 bit. For example, when the 1 bit is 0, the waveform set by RRC signaling can continue to be used, and when the 1 bit is 1, the waveform can be switched to a waveform different from the waveform set by RRC signaling.

[0106] Action 2) When the UE is configured or notified of dynamic waveform switching through DCI that does not schedule UL or DCI that schedules UL, the configuration or notification may be applied to the transmissions shown in 1) to 5) below.

[0107] 1) PUSCH scheduled by other non-fallback DCI (DCI format 0 1 or 0 2)

[0108] 2) PUSCH scheduled by other fallback DCI (DCI format 0 0)

[0109] 3) Type 1 CG-PUSCH

[0110] 4) Type 2 CG-PUSCH

[0111] 5) Msg3-PUSCH

[0112] When the dynamic waveform switching is notified by both the DCI for scheduling UL and the DCI for not scheduling UL, the UE can operate as shown below.

[0113] [Table 1]

[0114] DG PUSCH CG PUSCH Scheduling UL DCI application Do not apply Do not schedule UL DCI Do not apply application

[0115] As shown in Table 1, dynamic waveform switching based only on DCI that schedules the corresponding UL can be applied to DG-PUSCH. In addition, as shown in Table 1, dynamic waveform switching based only on DCI that does not schedule UL can be applied to CG-PUSCH.

[0116] [Table 2]

[0117] DG PUSCH CG PUSCH Scheduling UL DCI application application Do not schedule UL DCI application application

[0118] As shown in Table 2, dynamic waveform switching based on both DCI for scheduling UL and DCI for not scheduling UL can be applied to both DG-PUSCH and CG-PUSCH. In addition, the latest DCI that meets the timeline requirements described below for the target PUSCH opportunity can be applied.

[0119] [Table 3]

[0120] DG PUSCH CG PUSCH Scheduling UL DCI application Do not apply Do not schedule UL DCI application application

[0121] As shown in Table 3, dynamic waveform switching based on both DCI of the UL corresponding to the scheduling and DCI of the non-scheduled UL can be applied to DG-PUSCH. In addition, as shown in Table 3, dynamic waveform switching based only on DCI of the non-scheduled UL can be applied to CG-PUSCH.

[0122] [Table 4]

[0123] DG PUSCH CG PUSCH Scheduling UL DCI application application Do not schedule UL DCI Do not apply application

[0124] As shown in Table 4, dynamic waveform switching based only on the DCI of the UL corresponding to the scheduling can be applied to DG-PUSCH. As shown in Table 4, dynamic waveform switching based on both the DCI for scheduling the UL and the DCI for not scheduling the UL can be applied to CG-PUSCH. In addition, the latest DCI that meets the timeline requirements described later can be applied to the PUSCH opportunity as the object.

[0125] In addition, the DG-PUSCH action can be applied to the PUSCH transmission in the initial CG-PUSCH opportunity after the CG is activated.

[0126] For example, dynamic waveform switching based on DCI scheduling DG-PUSCH can be applied in the PUSCH transmission in the initial CG-PUSCH opportunity after the CG is activated.

[0127] For example, dynamic waveform switching based on DCI scheduling CG-PUSCH can be applied in the PUSCH transmission in the initial CG-PUSCH opportunity after the CG is activated.

[0128] In addition, the DG-PUSCH action can be applied to PUSCH transmission in all activated CG-PUSCH opportunities.

[0129] In the case of dynamic waveform switching of DG-PUSCH based on DCI that does not schedule UL, and in the case of dynamic waveform switching of CG-PUSCH based on DCI that schedules UL and DCI that does not schedule UL, the timeline requirements described below need to be considered. Even if dynamic waveform switching is based on DCI that schedules UL, when applied to CG-PUSCH, the timeline requirements need to be considered.

[0130] The following timeline requirements may be applied between the DCI notifying the dynamic waveform switching and the PUSCH to which the dynamic waveform switching is applied. A predetermined period may be required between the DCI and the PUSCH. The predetermined period may be any one of 1)-5) shown below.

[0131] 1) A period determined by the specification, for example, 28 code elements.

[0132] 2) A period determined based on the PUSCH processing time. (See Section 6.4 of Non-Patent Document 3)

[0133] 3) The period set by RRC signaling.

[0134] 4) Period notified via MAC-CE.

[0135] 5) Period notified via DCI.

[0136] In addition, if the DCI notifying the dynamic waveform switching of not scheduling UL and the PUSCH applying the dynamic waveform switching do not meet the above-mentioned timeline requirements, the terminal 20 may ignore the DCI notifying the dynamic waveform switching. In addition, if the DCI notifying the dynamic waveform switching of not scheduling UL and the PUSCH applying the dynamic waveform switching do not meet the above-mentioned timeline requirements, the terminal 20 may not send the PUSCH.

[0137] Action 3) The DCI and / or MAC-CE notifying the dynamic waveform switching may be valid during a predetermined period. The predetermined period may be any one of 1) to 5) shown below.

[0138] 1) A period determined by the specification from the time the notification is received, for example, 10 slots or 10 ms from the DCI opportunity.

[0139] 2) The period set by RRC signaling from the time the notification is received.

[0140] 3) The period notified via MAC-CE from the time of receiving the notification.

[0141] 4) The period notified via DCI from the time point when the notification is received.

[0142] 5) The period from the time when the notification is received to the corresponding scheduled PUSCH. Applicable only to DCI scheduling UL.

[0143] 6) The period from the time when the notification is received to the time when another DCI notifying dynamic waveform switching is received.

[0144] The predetermined period may depend on the notification type. For example, the same period may be applied to any notification type. For example, the notification may be effective for the same predetermined period from the opportunity of the notification in both a notification based on a DCI or MAC-CE for scheduling UL and a notification based on a DCI or MAC-CE for not scheduling UL.

[0145] For example, different periods may be set for different notification types. For example, a notification based on a DCI that schedules UL may be valid until the corresponding scheduled PUSCH. A DCI that does not schedule UL may be valid for a predetermined period from the DCI opportunity.

[0146] Furthermore, after the predetermined period expires, the terminal 20 may apply a waveform (for example, a change precoder) configured by RRC signaling, or may apply a waveform notified by the latest DCI of the scheduling UL.

[0147] In addition, the start time point of the predetermined period may be any one of 1) to 5) shown below.

[0148] 1) The time when the DCI is received

[0149] 2) The time point of the PDSCH scheduled by the DCI

[0150] 3) The time point of sending the HARQ-ACK for the DCI

[0151] 4) Time point set by RRC signaling

[0152] 5) Time point notified by MAC-CE and / or DCI

[0153] In addition, another period may be defined between the actual start time point of the predetermined period and the start time point based on the above 1) to 5). The other period may be, for example, X symbols.

[0154] Action 4) Figure 4 This is a diagram for explaining example (2) of dynamic waveform switching according to an embodiment of the present invention. In step S201, the terminal 20 receives a DCI indicating dynamic waveform switching and not including UL scheduling information from the base station 10. In the next step S202, a message is sent to the base station 10 indicating whether the DCI is successfully decoded. In addition, the DCI in step S201 can also be replaced with a DCI for scheduling UL.

[0155] As shown in 1) to 3) below, feedback regarding the reception of DCI not including UL scheduling information and indicating dynamic waveform switching may be transmitted to the base station 10 .

[0156] 1) In the case where the DCI indicating dynamic waveform switching is DCI 1_x that schedules DL transmission, the HARQ-ACK for the DL transmission can implicitly notify whether the DCI indicating dynamic waveform switching and not containing UL scheduling information is successfully decoded.

[0157] For example, it can be assumed that immediately after HARQ-ACK feedback, terminal 20 switches the waveform through the DCI. In addition, for example, it can be assumed that after X symbols from HARQ-ACK feedback, terminal 20 switches the waveform through the DCI.

[0158] The value of X may be specified in the specification (e.g., 28 symbols), may be set through RRC signaling (e.g., introducing new RRC parameters), may be notified through MAC-CE, or may be notified through DCI. In addition, when the DCI is not accurately detected, the terminal 20 may not assume the switching waveform.

[0159] 2) In the case where the DCI indicating dynamic waveform switching is not the DCI for scheduling data transmission and reception, the HARQ-ACK for the DCI may be independently generated.

[0160] For example, it can be assumed that immediately after HARQ-ACK feedback, terminal 20 switches the waveform through the DCI. In addition, for example, it can be assumed that after X symbols from HARQ-ACK feedback, terminal 20 switches the waveform through the DCI.

[0161] The value of X may be specified in the specification (e.g., 28 symbols), may be set through RRC signaling (e.g., introducing new RRC parameters), may be notified through MAC-CE, or may be notified through DCI. In addition, when the DCI is not accurately detected, the terminal 20 may not assume the switching waveform.

[0162] The HARQ-ACK codebook including the HARQ-ACK may be the first subcodebook or the second subcodebook.

[0163] 3) A UL MAC-CE may be introduced to provide feedback on whether or not a DCI indicating dynamic waveform switching can be received.

[0164] For example, it can be assumed that immediately after the MAC-CE is transmitted, the terminal 20 switches the waveform through the DCI. In addition, for example, it can be assumed that after X symbols are transmitted from the MAC-CE, the terminal 20 switches the waveform through the DCI.

[0165] The value of X may be specified in the specification (e.g., 28 symbols), may be set through RRC signaling (e.g., introducing new RRC parameters), may be notified through MAC-CE, or may be notified through DCI. In addition, when the DCI is not accurately detected, the terminal 20 may not assume the switching waveform.

[0166] The state of activating the MAC-CE may be defined. For example, when the DCI indicating that the UL is not scheduled for dynamic waveform switching is accurately decoded, the MAC-CE may be enabled.

[0167] Below, the settings shown in 1)-4) can be set only when new RRC parameters (such as xxx-r18) are set.

[0168] 1) Switch the waveform based on the notification included in the DCI format that does not schedule UL. Activate the above action 1).

[0169] 2) Based on the notification included in the DCI format that does not schedule UL, switch the waveform that is scheduled for UL transmission. Activate the above action 2).

[0170] 3) Based on the notification included in the DCI format that does not schedule UL, the waveform is switched during a predetermined period. The above action 3) is activated.

[0171] 4) Feedback on the DCI report of the non-scheduled UL containing the dynamic waveform switching notification. Activate the above action 4).

[0172] Below, UE capabilities shown in 1)-4) may be reported.

[0173] 1) Indicates whether the capability of switching waveforms based on the notification included in the DCI format of not scheduling UL is supported. Indicates whether the capability of the above action 1) is supported.

[0174] 2) Indicates whether the capability of switching the waveform for UL transmission is supported based on the notification included in the DCI format that does not schedule UL. Indicates whether the capability of the above-mentioned action 2) is supported.

[0175] 3) Indicates whether the capability of switching waveforms during a predetermined period based on the notification included in the DCI format of not scheduling UL is supported. Indicates whether the capability of the above-mentioned action 3) is supported.

[0176] 4) Indicates whether the capability of the action of feedback of the DCI report of the non-scheduled UL including the dynamic waveform switching notification is supported. Indicates whether the capability of the above action 4) is supported.

[0177] According to the above-mentioned embodiments, the wireless communication system can dynamically switch the waveform by not scheduling DCI of UL or scheduling DCI of UL.

[0178] That is, in a wireless communication system, the waveform can be switched dynamically.

[0179] (Device Structure)

[0180] Next, the functional configuration examples of the base station 10 and the terminal 20 that execute the above-described processing and operation are 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 in the embodiments.

[0181] <Base station 10>

[0182] Figure 5 FIG. 1 is a diagram showing an example of a functional configuration of a base station 10 in an embodiment of the present invention. Figure 5 As shown, the base station 10 includes a transmission unit 110 , a reception unit 120 , a setting unit 130 , and a control unit 140 . Figure 5 The functional structure shown is only an example. As long as the actions involved in the embodiments of the present invention can be performed, the functional division and the name of the functional unit can be arbitrary. The sending unit 110 and the receiving unit 120 can also be called a communication unit.

[0183] The transmitting unit 110 includes a function of generating a signal to be sent to the terminal 20 side and wirelessly transmitting the signal. In addition, the transmitting unit 110 sends network node messages to other network nodes. The receiving unit 120 includes a function of receiving various signals sent from the terminal 20 and obtaining, for example, higher layer information from the received signals. In addition, the transmitting unit 110 has a function of sending NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, etc. to the terminal 20. In addition, the receiving unit 120 receives network node messages from other network nodes.

[0184] The setting unit 130 stores preset setting information and various setting information transmitted to the terminal 20. The content of the setting information is, for example, information related to the BWP.

[0185] As described in the embodiment, the control unit 140 performs control related to the BWP. Functional units related to signal transmission in the control unit 140 may be included in the transmission unit 110 , and functional units related to signal reception in the control unit 140 may be included in the reception unit 120 .

[0186] <Terminal 20>

[0187] Figure 6 FIG. 2 is a diagram showing an example of the functional structure of the terminal 20 in the embodiment of the present invention. Figure 6 As shown, the terminal 20 includes a transmitting unit 210 , a receiving unit 220 , a setting unit 230 , and a control unit 240 . Figure 6 The functional structure shown is only an example. As long as the actions involved in the embodiments of the present invention can be performed, the functional division and the name of the functional unit can be arbitrary. The sending unit 210 and the receiving unit 220 can also be called a communication unit.

[0188] The transmitting unit 210 generates a transmission signal according to the transmission data, and transmits the transmission signal wirelessly. The receiving unit 220 receives various signals wirelessly, and obtains a higher layer signal from the received physical layer signal. In addition, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals, etc. transmitted from the base station 10. In addition, for example, as D2D communication, the transmitting unit 210 transmits PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel), etc. to other terminals 20, and the receiving unit 220 receives PSCCH, PSSCH, PSDCH or PSBCH, etc. from other terminals 20.

[0189] The setting unit 230 stores various setting information received by the receiving unit 220 from the base station 10. In addition, the setting unit 230 also stores pre-set setting information. The content of the setting information is, for example, information related to the BWP.

[0190] As described in the embodiment, the control unit 240 performs control related to the BWP. The functional unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and the functional unit related to signal reception in the control unit 240 may be included in the reception unit 220.

[0191] (Hardware Structure)

[0192] The block diagram used in the description of the above embodiment ( Figure 5 and Figure 6 ) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using one device that is physically or logically combined, or it can be implemented by connecting two or more physically or logically separated devices directly or indirectly (for example, using wires, wirelessly, etc.) and using these multiple devices. The functional blocks can also be implemented by combining software in the above-mentioned one device or the above-mentioned multiple devices.

[0193] Functions include judging, determining, judging, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that performs a sending function is called a transmitting unit or a transmitter. In short, as mentioned above, there is no particular limitation on the implementation method.

[0194] For example, the base station 10 , the terminal 20 , and the like in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 7 1 is a diagram showing an example of a hardware structure of a base station 10 and a terminal 20 involved in one embodiment of the present disclosure. The base station 10 and the terminal 20 may also be configured as a computer device that physically includes a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0195] In the following description, the word "device" may be replaced by "circuit", "device", "unit", etc. The hardware configuration of the base station 10 and the terminal 20 may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0196] Each function in the base station 10 and the terminal 20 is implemented by the following method: predetermined software (program) is read into hardware such as the processor 1001 and the storage device 1002, so that the processor 1001 performs calculations and controls the communication of the communication device 1004 or controls at least one of the reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

[0197] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a computing device, registers, etc. For example, the control unit 140, the control unit 240, etc. may also be implemented by the processor 1001.

[0198] In addition, the processor 1001 reads a program (program code), a software module, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and performs various processes accordingly. As a program, a program that causes the computer to execute at least a part of the actions described in the above embodiments is used. For example, Figure 5 The control unit 140 of the base station 10 shown may also be implemented by a control program stored in the storage device 1002 and executed in the processor 1001. In addition, for example, Figure 6 The control unit 240 of the terminal 20 shown can also be implemented by a control program stored in the storage device 1002 and operated in the processor 1001. Although it is described that the above-mentioned various processes are performed by one processor 1001, the above-mentioned various processes can also be performed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be implemented by one or more chips. In addition, the program can also be sent from the network via a telecommunication line.

[0199] The storage device 1002 is a computer-readable recording medium, and may be composed of at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing the communication method involved in one embodiment of the present disclosure.

[0200] The auxiliary storage device 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (CompactDisc ROM), a hard disk drive, a floppy 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, and other appropriate media including at least one of the storage device 1002 and the auxiliary storage device 1003.

[0201] The communication device 1004 is hardware (transceiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to implement at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). For example, a transceiver antenna, an amplifier unit, a transceiver unit, a transmission path interface, etc. may also be implemented by the communication device 1004. The transceiver unit may also be implemented by physically or logically separating the transmitting unit and the receiving unit.

[0202] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, an LED light, etc.). In addition, the input device 1005 and the output device 1006 may also be integrally formed (e.g., a touch panel).

[0203] In addition, the processor 1001 and the storage device 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or different buses may be used between the devices.

[0204] In addition, the base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array), and a part or all of each functional block may be implemented by the hardware. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0205] Figure 8 FIG. 2 shows a structural example of a vehicle 2001. Figure 8As shown, the vehicle 2001 includes a driving 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 form / embodiment described in the present disclosure may also be applied to a communication device mounted on the vehicle 2001, for example, may also be applied to the communication module 2013.

[0206] The driving unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also referred to as a steering wheel), 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 a user.

[0207] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals from various sensors 2021 to 2029 provided in the vehicle 2001 are input to the electronic control unit 2010. The electronic control unit 2010 may also be referred to as an ECU (Electronic Control Unit).

[0208] As signals from various sensors 2021~2029, there are current signals from the current sensor 2021 that senses the current of the motor, speed signals of the front wheels and rear wheels obtained by the speed sensor 2022, air pressure signals of the front wheels and rear wheels obtained by the air pressure sensor 2023, vehicle speed signals obtained by the vehicle speed sensor 2024, acceleration signals obtained by the acceleration sensor 2025, accelerator pedal depression amount signals obtained by the accelerator pedal sensor 2029, brake pedal depression amount signals obtained by the brake pedal sensor 2026, shift lever operation signals obtained by the shift lever sensor 2027, detection signals for detecting obstacles, vehicles, pedestrians, etc. obtained by the object detection sensor 2028, and the like.

[0209] The information service unit 2012 is composed of various devices such as a car navigation system, an audio system, a speaker, a television, and a radio for providing (outputting) various 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 obtained from an external device via the communication module 2013 and the like to provide various multimedia information and multimedia services to passengers of the vehicle 2001. The information service unit 2012 may include an input device for accepting input from the outside (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.), and may also include an output device for implementing output to the outside (for example, a display, a speaker, an LED light, a touch panel, etc.).

[0210] The driving assistance system unit 2030 is composed of various devices for preventing accidents or reducing the driver's driving load, such as millimeter wave radar, LiDAR (Light Detection and Ranging), camera, positioning device (such as GNSS, etc.), map information (such as high-definition (HD) map, autonomous driving vehicle (AV) map, etc.), gyroscope system (such as IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chip, AI processor, and one or more ECUs that control these devices. In addition, the driving assistance system unit 2030 sends and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0211] The communication module 2013 can communicate with the microprocessor 2031 and the components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data with the drive unit 2002, the steering unit 2003, the accelerator pedal 2004, the brake pedal 2005, the shift lever 2006, the front wheel 2007, the rear wheel 2008, the axle 2009, the microprocessor 2031 in the electronic control unit 2010, the memory (ROM, RAM) 2032, and the sensors 2021 to 2029 via the communication port 2033.

[0212] The communication module 2013 can be controlled by the microprocessor 2031 of the electronic control unit 2010, and is a communication device that can communicate with an external device. For example, various information can be sent and received with the external device via wireless communication. The communication module 2013 can be located inside or outside the electronic control unit 2010. The external device can also be, for example, a base station, a mobile station, etc.

[0213] The communication module 2013 may transmit at least one of the signals from the various sensors 2021 to 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 to 2028, the information service unit 2012, etc. may also be referred to as an input unit that receives input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above input.

[0214] The communication module 2013 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) sent from an external device and displays it on the information service unit 2012 of the vehicle 2001. The information service unit 2012 may also be referred to as an output unit that outputs information (for example, outputs information to a display, a speaker, etc. based on the PDSCH received by the communication module 2013 (or data / information decoded from the PDSCH)). In addition, the communication module 2013 stores various information received from the external device in the memory 2032 that can be used by the microprocessor 2031. The microprocessor 2031 may also control the drive unit 2002, the steering unit 2003, the accelerator pedal 2004, the brake pedal 2005, the gear lever 2006, the front wheel 2007, the rear wheel 2008, the axle 2009, the sensors 2021 to 2029, etc. of the vehicle 2001 based on the information stored in the memory 2032.

[0215] (Summary of Implementation Methods)

[0216] As described above, according to an embodiment of the present invention, there is provided a terminal comprising: a receiving unit, which receives, from a base station, first downlink control information that does not schedule an uplink or second downlink control information that schedules an uplink; a control unit, which switches a waveform applied to an uplink transmission based on the first downlink control information or the second downlink control information; and a transmitting unit, which comprises a transmitting unit that sends the uplink transmission to the base station, and the control unit sets a valid period for switching the waveform of the uplink transmission.

[0217] Through the above structure, the wireless communication system can dynamically switch the waveform by not scheduling the DCI of UL or scheduling the DCI of UL. That is, in the wireless communication system, the waveform can be dynamically switched.

[0218] Alternatively, the transmitting unit transmits feedback to the base station, the feedback indicating whether decoding of the first downlink control information or the second downlink control information is successful. With this structure, the wireless communication system can dynamically switch waveforms by scheduling UL DCI or scheduling UL DCI.

[0219] Alternatively, the control unit switches the waveform of the uplink transmission immediately after sending the feedback. With this structure, the wireless communication system can dynamically switch the waveform by not scheduling UL DCI or scheduling UL DCI.

[0220] Alternatively, the control unit may apply the waveform set by the higher layer parameter to uplink transmission after the validity period expires. With this configuration, the wireless communication system can dynamically switch the waveform by not scheduling UL DCI or scheduling UL DCI.

[0221] Alternatively, the control unit sets the time point of receiving the first downlink control information or the second downlink control information as the start time point of the effective period. With this configuration, the wireless communication system can dynamically switch waveforms by scheduling UL DCI or not scheduling UL DCI.

[0222] In addition, according to an embodiment of the present invention, a communication method is provided, wherein a terminal performs the following steps: receiving a first downlink control information that does not schedule an uplink or a second downlink control information that schedules an uplink from a base station; switching a waveform applied to an uplink transmission based on the first downlink control information or the second downlink control information; having a sending unit that sends the uplink transmission to the base station; and setting an effective period for switching the waveform for the uplink transmission.

[0223] Through the above structure, the wireless communication system can dynamically switch the waveform by not scheduling the DCI of UL or scheduling the DCI of UL. That is, in the wireless communication system, the waveform can be dynamically switched.

[0224] (Supplementary Implementation Methods)

[0225] The above describes the embodiments of the present invention, but the disclosed invention is not limited to such embodiments, and those skilled in the art should understand various variations, modifications, alternatives, replacements, etc. In order to promote the understanding of the invention, specific numerical examples are used for description, but unless otherwise specified, these numerical values ​​are only examples, and any appropriate value can be used. The item distinction in the above description is not essential to the present invention. The items recorded in more than two items can be combined and used as needed, and the items recorded in a certain item can be applied to the items recorded in another item (as long as there is no contradiction). The boundaries of the functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of the physical components. The actions of multiple functional units can be performed by one physical component, or the actions of one functional unit can be performed by multiple physical components. Regarding the processing process described in the embodiment, the order of processing can be swapped without contradiction. In order to facilitate the description of the processing, the base station 10 and the terminal 20 are described using a functional block diagram, but such a device can also be implemented by hardware, software, or a combination thereof. The software that operates according to the implementation mode of the present invention through the processor of the base station 10 and the software that operates according to the implementation mode of the present invention through the processor of the terminal 20 can also 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 and any other appropriate storage medium.

[0226] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), high-level signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals or a combination thereof. In addition, RRC signaling may be referred to as an RRC message, for example, it may also be an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0227] Each form / embodiment described in the present disclosure may also be applied to a mobile communication system using LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), 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 At least one of 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other appropriate systems, and next-generation systems that are expanded, modified, created, and specified based on these systems. In addition, a combination of multiple systems (for example, a combination of at least one of LTE and LTE-A and 5G, etc.) may also be applied.

[0228] The processing procedures, timings, and flows of each form / implementation described in this specification may be reversed in order if there is no contradiction. For example, the methods described in this disclosure use the order in which the elements of various steps are presented, but are not limited to the specific order presented.

[0229] In this specification, specific actions performed by the base station 10 are sometimes also performed by its upper node according to the situation. In a network composed of one or more network nodes having the base station 10, various actions performed for communicating with the terminal 20 can be performed by at least one of the base station 10 and other network nodes other than the base station 10 (for example, MME or S-GW, etc., but not limited to these). In the above, the case where there is one other network node other than the base station 10 is illustrated, but the other network node may also be a combination of multiple other network nodes (for example, MME and S-GW).

[0230] The information or signals described in the present disclosure can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), and can also be input and output via a plurality of network nodes.

[0231] The input or output information can be stored in a specific location (e.g., a memory) or managed using a management table. The input or output information can be rewritten, updated, or appended. The output information can also be deleted. The input information can also be sent to other devices.

[0232] The determination in the present disclosure may be performed by a value represented by 1 bit (0 or 1), by a Boolean value (Boolean: true or false), or by comparison of numerical values ​​(for example, comparison with a predetermined value).

[0233] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to commands, sets of commands, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0234] In addition, software, commands, information, etc. may be sent and received via a transmission medium. For example, when software is sent from a web page, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0235] The information, signals, etc. described in the present disclosure may also be represented by any of a variety of different technologies. For example, the data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be involved in the above description as a whole may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination of these.

[0236] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may also be a signal (signaling). In addition, a signal may also be a message. In addition, a component carrier (CC) may also be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0237] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0238] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​to predetermined values, or other corresponding information. For example, a wireless resource may be indicated by an index.

[0239] The names used for the above parameters are non-restrictive in any respect. Furthermore, the formulas etc. using these parameters may sometimes differ from those explicitly disclosed in the present disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by all appropriate names, and therefore the various names assigned to these various channels and information elements are non-restrictive in any respect.

[0240] In the present disclosure, the terms "base station (BS)", "wireless 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", "component carrier" and the like are used interchangeably. Sometimes, the base station is also referred to as macro cell, small cell, femto cell, pico cell and the like.

[0241] A base station can accommodate one or more (for example, 3) 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 also provide communication services through a base station subsystem (for example, a small base station for indoor use (RRH: Remote Radio Head)). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provide communication services within the coverage area.

[0242] In the present disclosure, the base station sending information to the terminal may be replaced by the base station instructing the terminal to perform control / action based on the information.

[0243] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0244] For mobile stations, those skilled in the art sometimes also use the following terms: 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 appropriate terms.

[0245] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the base station and the mobile station may also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body refers to an object that can move, and the moving speed is arbitrary. In addition, of course, it also includes the situation where the mobile body stops. The mobile body includes, for example, vehicles, transport vehicles, cars, motorcycles, bicycles, networked cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, two-wheel trailers (rear car), rickshaws, ships (ships and other watercraft: ships and other ships), airplanes, rockets, artificial satellites, Drone (registered trademark), multi-rotor helicopters, quadcopters, balloons and objects mounted on them, and is not limited to this. In addition, the mobile body may also be a mobile body that drives autonomously based on an operation instruction. It can be a means of transportation (such as a car, an airplane, etc.), a mobile body that moves in an unmanned manner (such as a drone, an automatic driving car, etc.), or a robot (man-powered or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0246] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple terminals 20 (for example, it may also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.) may also apply various forms / implementations of the present disclosure. In this case, it may also be configured that the terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0247] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station may have the functions of the user terminal.

[0248] The terms "determining" and "determining" used in this disclosure sometimes include a variety of actions. "Determining" and "determining" may include, for example, considering matters that have been judged, calculated, calculated, processed, derived, investigated, searched (for example, searched in a table, database or other data structure), confirmed (ascertaining) as matters that have been "determined" or "determined", etc. In addition, "determining" and "determining" may include matters that have been received (for example, receiving information), transmitted (for example, transmitting information), input, output, accessed (for example, accessed data in memory) as matters that have been "determined" or "determined", etc. In addition, "determining" and "determining" may include matters that have been resolved (resolving), selected (selecting), chosen (choosing), established (establishing), compared (comparing), etc. as matters that have been "determined" or "determined". That is, "judgment" and "decision" may include certain actions that are considered to be "judged" or "decided". In addition, "judgment (decision)" may also be replaced by "assuming", "expecting", "considering", etc.

[0249] The terms "connected", "coupled" or all variations of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, and may include the situation where there is one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" may be used to replace "connection". In the context of the present 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, and as some non-limiting and non-inclusive examples, electromagnetic energy having wavelengths in the wireless frequency domain, microwave region, and light (including both visible and invisible) region may be used to "connect" or "couple" to each other.

[0250] The reference signal may be referred to as RS (Reference Signal) for short, or may be referred to as a pilot signal (Pilot) according to the applied standard.

[0251] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise explicitly stated. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0252] Any reference to an element using the designations "first", "second", etc. used in this disclosure does not necessarily limit the number or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, a reference to a first element and a second element does not mean that only two elements can be used or that the first element must precede the second element in any form.

[0253] The “unit” in the configuration of each of the above-mentioned devices may be replaced with a “section”, “circuit”, “device” or the like.

[0254] When the terms "include", "including" and their variations are used in the present disclosure, these terms are intended to be inclusive, just like the term "comprising". Furthermore, the term "or" used in the present disclosure does not mean an exclusive or.

[0255] A radio frame may be composed of one or more frames in the time domain. In the time domain, one or more frames may be referred to as a subframe. A subframe may also be composed of one or more time slots in the time domain. A subframe may be a fixed time length (e.g., 1 ms) that is independent of a numerology.

[0256] A parameter set may be a communication parameter applied to at least one of the transmission and reception of a certain signal or channel. The parameter set may, for example, represent at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transceiver in the frequency domain, specific windowing processing performed by the transceiver in the time domain, and the like.

[0257] A slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A slot may be a time unit based on a parameter set.

[0258] A time slot may contain multiple mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in units of time greater than a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type B.

[0259] A radio frame, a subframe, a time slot, a mini-time slot, and a symbol all represent time units for transmitting signals. A radio frame, a subframe, a time slot, a mini-time slot, and a symbol may be referred to by other corresponding names.

[0260] For example, one subframe may be referred to as a transmission time interval (TTI), multiple consecutive subframes may be referred to as a TTI, and one time slot or one mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. In addition, the unit representing a TTI may not be referred to as a subframe, but as a time slot, a mini time slot, or the like.

[0261] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each terminal 20) to each terminal 20 in units of TTI. In addition, the definition of TTI is not limited to this.

[0262] TTI can be a transmission time unit of data packets (transport blocks), code blocks, code words, etc. after channel coding, or a processing unit such as scheduling and link adaptation. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which the transport block, code block, code word, etc. is actually mapped can be shorter than the TTI.

[0263] In addition, when one time slot or one mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can be the minimum time unit for scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit for scheduling can be controlled.

[0264] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0265] In addition, for a long TTI (for example, a normal TTI, a subframe, etc.), it can be replaced with a TTI having a time length exceeding 1ms, and for a short TTI (for example, a shortened TTI, etc.), it can be replaced with a TTI having a TTI length smaller than the long TTI (longTTI) and greater than 1ms.

[0266] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain. In the frequency domain, it may include one or more consecutive subcarriers. The number of subcarriers included in an RB may be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0267] In addition, the time domain of an RB may include one or more symbols, and may be the length of one slot, one mini slot, one subframe, or one TTI. One TTI, one subframe, etc. may be composed of one or more resource blocks, respectively.

[0268] In addition, one or more RBs may also be referred to as a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, etc.

[0269] In addition, 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.

[0270] A bandwidth part (BWP) (also referred to as partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, the common RBs may be identified by the index of the RBs relative to the common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0271] 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.

[0272] At least one of the set BWPs may be active, and the UE may not assume that a predetermined signal / channel is transmitted or received outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

[0273] The above structures of radio frames, subframes, time slots, mini-time slots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of time slots per subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length may be changed in various ways.

[0274] In the present disclosure, when an article is added by translation, such as a, an, and the in English, for example, the present disclosure also includes a case where the noun following the article is in a plural form.

[0275] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". In addition, the term may mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same way as "different".

[0276] Each form / implementation described in the present disclosure may be used alone or in combination, and may be switched depending on the execution. In addition, notification of predetermined information (e.g., notification of "yes X") is not limited to being performed explicitly, but may also be performed implicitly (e.g., not notifying the predetermined information).

[0277] The present disclosure is described in detail above, but it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as a modification and variation without departing from the subject matter and scope of the present disclosure as determined by the claims. Therefore, the purpose of the description of the present disclosure is to illustrate and not to have any limiting meaning on the present disclosure.

[0278] Description of symbols

[0279] 10: Base Station

[0280] 110: Sending Department

[0281] 120: Receiving Department

[0282] 130: Setting department

[0283] 140: Control Department

[0284] 20: Terminal

[0285] 210: Sending Department

[0286] 220: Receiving Department

[0287] 230: Setting department

[0288] 240: Control Department

[0289] 1001: Processor

[0290] 1002: Storage device

[0291] 1003: Auxiliary storage device

[0292] 1004: Communication device

[0293] 1005: Input device

[0294] 1006: Output device

[0295] 2001: Vehicles

[0296] 2002: Drive Department

[0297] 2003: Steering

[0298] 2004: Accelerator pedal

[0299] 2005: Brake pedal

[0300] 2006: Gear Lever

[0301] 2007: Front wheel

[0302] 2008: Rear wheel

[0303] 2009: Axles

[0304] 2010: Electronic Control Department

[0305] 2012: Information Services Department

[0306] 2013: Communication Module

[0307] 2021: Current Sensors

[0308] 2022: Speed ​​Sensor

[0309] 2023: Barometric pressure sensor

[0310] 2024: Vehicle speed sensor

[0311] 2025: Accelerometers

[0312] 2026: Brake pedal sensor

[0313] 2027: Gearshift sensor

[0314] 2028: Object detection sensors

[0315] 2029: Accelerator pedal sensor

[0316] 2030: Driving Assistance Systems Division

[0317] 2031: Microprocessors

[0318] 2032: Memory (ROM, RAM)

[0319] 2033: Communication port (IO port).

Claims

1. A terminal comprising: a receiving unit configured to receive, from a base station, first downlink control information not scheduling an uplink or second downlink control information scheduling an uplink; a control unit configured to switch a waveform applied to uplink transmission based on the first downlink control information or the second downlink control information; and a sending unit, which sends the uplink transmission to the base station, The control unit sets an effective period for switching the waveform of the uplink transmission.

2. The terminal according to claim 1, in, The transmitting unit transmits feedback to the base station, the feedback indicating whether decoding of the first downlink control information or the second downlink control information is successful.

3. The terminal according to claim 2, in, After sending the feedback, the control unit switches the waveform of the uplink transmission.

4. The terminal according to claim 1, in, The control unit applies the waveform set by the higher layer parameter to uplink transmission after the validity period expires.

5. The terminal according to claim 1, in, The control unit sets a time point at which the first downlink control information or the second downlink control information is received as a start time point of the effective period.

6. A communication method, in, The terminal performs the following steps: receiving, from a base station, first downlink control information not scheduling an uplink or second downlink control information scheduling an uplink; Switching a waveform applied to uplink transmission based on the first downlink control information or the second downlink control information; Sending the uplink transmission to the base station; as well as Set the effective period for switching the waveform of the uplink transmission.

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