Terminal and communication method

Abstract

The terminal includes: a receiving unit that receives scheduling information for one or more second component carriers of the plurality of component carriers via a first component carrier constituting carrier aggregation; and a control unit that activates any one of the plurality of BWPs set for the one or more second component carriers based on identification information of the bandwidth part (BWP) included in the scheduling information.

Description

Technical Field

[0001] This invention relates to a terminal and a communication method in a wireless communication system. Background Technology

[0002] NR (New Radio) Dynamic Spectrum Sharing (DSS) refers to the use of LTE (Long Term Evolution) and NR on the same carrier. In an LTE system, CRS (Cell Specific Reference Signal) and PDCCH (Physical Downlink Control Channel) are transmitted to LTE users. Therefore, in DSS, time resources used for transmitting signals toward LTE users are avoided to transmit NR PDCCH and data.

[0003] In 3GPP Release 17, the enhancement of DSS was studied. Specific aspects of this enhancement include, for example, the use of the Physical Downlink Control Channel (PDCCH) of the secondary cell (SCell) of the CA for cross-carrier scheduling of the Physical Downlink Shared Channel (PDSCH) or Physical Uplink Shared Channel (PUSCH) of the PCell (or primary secondary cell: PSCell). Additionally, the scheduling of PDSCH for multiple cells using a single Downlink Control Information (DCI) for the PDCCH of P(S)Cell / SCell was investigated.

[0004] Existing technical documents

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TSG RAN Meeting #86, RP-193260, Sitges, Spain, December 9-12, 2019

[0007] Non-patent document 2: 3GPP TS38.213 V15.7.0 (2019-09) Summary of the Invention

[0008] The problem the invention aims to solve

[0009] This study investigated minimizing the size of a single DCI used in scheduling across multiple cells. Furthermore, by including the BWP indication field in the DCI, it is possible to specify the active BWP for the terminal.

[0010] When scheduling across multiple cells, a method is needed to effectively specify the active BWP for a terminal.

[0011] means for solving problems

[0012] According to one aspect of the present invention, a terminal is provided, the terminal comprising: a receiving unit that receives scheduling information for one or more second component carriers of the plurality of component carriers constituting carrier aggregation via a first component carrier; and a control unit that activates any one of a plurality of BWPs set for the one or more second component carriers based on identification information of a bandwidth part (BWP) included in the scheduling information.

[0013] Invention Effects

[0014] According to an embodiment, a method is provided for effectively specifying the active BWP for a terminal in the case of scheduling for multiple cells. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the communication system in this embodiment.

[0016] Figure 2 This is a diagram illustrating an example of scheduling for multiple cells.

[0017] Figure 3 This is a diagram illustrating an example of the correlation between the bit values ​​of the BWP indicator field and the combinations of BWPs activated in each CC.

[0018] Figure 4 This is a diagram illustrating an example of the joint encoding of the CIF and BWP indication field.

[0019] Figure 5 This is a diagram illustrating an example of the functional structure of a terminal.

[0020] Figure 6This is a diagram illustrating an example of the functional structure of a base station.

[0021] Figure 7 This is a diagram illustrating an example of the hardware structure of a terminal and a base station. Detailed Implementation

[0022] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, the embodiments described below are examples, and the application of the present invention is not limited to the embodiments described below.

[0023] The wireless communication system in the following embodiments is envisioned as being based primarily on NR, but this is only one example. The wireless communication system in this embodiment may be based, in part or in whole, on a wireless communication system other than NR (e.g., LTE).

[0024] (System Overall Structure)

[0025] Figure 1 A structural diagram of the wireless communication system according to this embodiment is shown. (For example...) Figure 1 As shown, the wireless communication system involved in this embodiment includes a terminal 10 and a base station 20. Figure 1 The image shows one terminal 10 and one base station 20, but this is just an example and there can be multiple of each.

[0026] Terminal 10 is a communication device with wireless communication capabilities, such as a smartphone, mobile phone, tablet computer, wearable terminal, or M2M (Machine-to-Machine) communication module. Terminal 10 receives control signals or data from base station 20 via DL and transmits control signals or data to base station 20 via UL, thereby utilizing various communication services provided by the wireless communication system. For example, the channels transmitted from terminal 10 include PUCCH (Physical Uplink Control Channel) and PUSCH (Physical Uplink Shared Channel). Furthermore, terminal 10 can be referred to as UE, and base station 20 as gNB.

[0027] In this embodiment, the duplex mode can be either TDD (Time Division Duplex) or FDD (Frequency Division Duplex).

[0028] Furthermore, in the implementation, the "configure" wireless parameters can be preset values ​​or set according to wireless parameters notified from the base station 20 or the terminal 10.

[0029] Base station 20 is a communication device that provides one or more cells and wirelessly communicates with terminal 10. The physical resources of the wireless signal are defined in the time and frequency domains. The time domain can be defined by the number of OFDM symbols, and the frequency domain can be defined by the number of subcarriers or resource blocks. Base station 20 sends synchronization signals and system information to terminal 10. Synchronization signals are, for example, NR-PSS and NR-SSS. Part of the system information is transmitted, for example, via NR-PBCH, also known as broadcast information. Synchronization signals and broadcast information can be periodically transmitted as SS blocks (SS / PBCH blocks) consisting of a predetermined number of OFDM symbols. For example, base station 20 sends control signals or data to terminal 10 via DL (Downlink) and receives control signals or data from terminal 10 via UL (Uplink). Both base station 20 and terminal 10 are capable of beamforming for signal transmission and reception. For example, as... Figure 1 As shown, the reference signals transmitted from base station 20 include CSI-RS (Channel State Information Reference Signal), and the channels transmitted from base station 20 include PDCCH (Physical Downlink Control Channel) and PDSCH (Physical Downlink Shared Channel).

[0030] (BWP Switching)

[0031] In 3GPP Release 15 NR, the Bandwidth Part Operation (BWP) is specified for switching the transmit and receive bandwidth of Terminal 10. The Bandwidth Part (BWP) refers to a subset of adjacent common resource blocks.

[0032] On the base station 20 side, signals can be transmitted across the entire system bandwidth. In this case, on the terminal 10 side, receiving signals across the entire bandwidth at all times may increase the power consumption of the terminal 10. Furthermore, some terminals may not support reception across the entire bandwidth. Therefore, the base station 20 can set the receiving bandwidth for the terminal 10, for example, it can set a bandwidth narrower than the system bandwidth. For example, the terminal 10 initially sets a narrower bandwidth to receive signals. Then, the terminal 10 can switch to a wider bandwidth according to instructions from the base station.

[0033] In the downlink, base station 20 can use higher-layer signaling to set up to four bandwidth parts (bandwidth, frequency position, subcarrier spacing, etc.) for terminal 10. In this case, a single downlink bandwidth part becomes active at any given time. Terminal 10 receives PDSCH (Physical Downlink Shared Channel), PDCCH, or CSI-RS (Channel State Information Reference Signal) within the active bandwidth part. That is, it is envisioned that PDSCH, PDCCH, and CSI-RS are not transmitted outside the active bandwidth part. In addition, when terminal 10 detects the setting of BWP from base station 20, it can set the initial active DL BWP and the initial active UL BWP using firstActiveDownlinkBWP-Id and firstActiveUplinkBWP-ID.

[0034] Furthermore, in the uplink, base station 20 can use higher-layer signaling to configure up to four bandwidth parts (bandwidth, frequency position, subcarrier spacing, etc.) for terminal 10. In this case, a single uplink bandwidth part is active at any given time. When configuring a supplementary uplink (SUL) for terminal 10, base station 20 can additionally configure up to four bandwidth parts for terminal 10 in this supplementary uplink. In this case, a single additional uplink bandwidth part is active at any given time. Terminal 10 does not transmit PUSCH (Physical Uplink Shared Channel) or PUCCH (Physical Uplink Control Channel) outside of the active bandwidth parts. That is, terminal 10 transmits PUSCH or PUCCH within the active bandwidth parts.

[0035] BWP switching can be performed in the following three modes, for example.

[0036] (Mode 1)

[0037] Base station 20 can switch the BWP set for terminal 10 via Downlink Control Information (DCI). Base station 20 can use DCI format 1_1 or DCI format 0_1 ​​to indicate the active DL / UL BWP to terminal 10. For example, terminal 10 can switch from the current active DL / UL BWP to the active DL / UL BWP indicated by the value of the DCI's Bandwidth-part indicator field, even if the value of the Bandwidth-part indicator field in the DCI does not represent the current active DL / UL BWP.

[0038] (Mode 2)

[0039] Base station 20 can use higher-layer signaling to switch the BWP configured for terminal 10. For example, base station 20 can use RRC (Radio Resource Control) reconfiguration messages to switch the BWP configured for terminal 10. For example, terminal 10 can switch the current active DL BWP / active UL BWP to the initial DL BWP / initial UL BWP indicated by the RRCReconfiguration message.

[0040] (Mode 3)

[0041] Furthermore, after a BWP is set in terminal 10, if no signal is received in terminal 10 during the period up to the expiration of bwp-InactivityTimer, terminal 10 can switch the active BWP to the default BWP after the bwp-InactivityTimer expires. For example, terminal 10 can switch the current active DL BWP / active UL BWP to the BWP shown by defaultDownlinkBWP-Id / BWP shown by defaultUplinkBWP-Id, or initial DLBWP / initial UL BWP.

[0042] (NR Dynamic spectrum sharing(DSS))

[0043] NR (New Radio) Dynamic Spectrum Sharing (DSS) refers to the use of LTE (Long Term Evolution) and NR on the same carrier. In an LTE system, CRS (Cell Specific Reference Signal) and PDCCH (Physical Downlink Control Channel) are transmitted to LTE users. Therefore, in DSS, time resources used for transmitting signals toward LTE users are avoided to transmit NR PDCCH and data.

[0044] Regarding DSS, methods have been introduced to date, such as methods for importing signaling for rate matching of resources to the CRS of LTE, and methods for shifting the position of the NR's DMRS (Demodulation Reference Signal) to avoid conflict between the NR's DMRS and the LTE's CRS.

[0045] The carrier using DSS is the same carrier used in LTE systems, and therefore, compared to a typical NR carrier, it is a lower frequency carrier, such as 800MHz or 2GHz. Consequently, because the carrier using DSS is used in LTE systems, on the NR system side, NR control signals are mapped to the carrier, bypassing LTE control signals, CRS, etc. Therefore, in the case of a carrier using DSS, it is envisioned that the capacity for transmitting NR control signals is reduced compared to the capacity used for transmitting NR control signals on a typical NR carrier.

[0046] In an NR system, carrier aggregation (CA) is envisioned, incorporating carriers with DSS (Dynamic Subtraction Switching). As mentioned above, carriers with DSS constitute carriers at lower frequencies compared to typical NR carriers. Therefore, it is envisioned that carriers with DSS are used as primary cells (PCells) for carrier aggregation (CA). However, as mentioned above, for carriers with DSS, the capacity for transmitting NR control signals is reduced compared to the capacity for transmitting NR control signals on typical NR carriers. Therefore, in this case, the capacity for transmitting NR control signals for carriers with DSS may be insufficient as a PCell.

[0047] Therefore, in 3GPP Release 17, the enhancement of DSS was studied. It is conceivable that the frequency band is limited to, for example, FR1 in Frequency Range (FR) 1 and FR2.

[0048] As a specific extension of DSS, for example, cross-carrier scheduling of the Physical Downlink Shared Channel (PDSCH) or Physical Uplink Shared Channel (PUSCH) of PCells (or primary secondary cells (PSCells)) using the Physical Downlink Control Channel (PDCCH) of the secondary cell (SCell) of CA was studied. Furthermore, regarding the PDCCH of P(S)Cell / SCell, scheduling of PDSCH for multiple cells using a single Downlink Control Information (DCI) was investigated. The number of cells using a single DCI for scheduling can be, for example, two or more.

[0049] This study investigates minimizing the size of a single DCI used when scheduling PDSCH for multiple cells. For example, an upper limit can be set on the size of the single DCI used when scheduling PDSCH for multiple cells. Furthermore, while the example above envisions scheduling PDSCH for multiple cells using a single DCI, the number of DCIs is not limited to this example; for example, it could be two or more. Additionally, as... Figure 2 As shown, scheduling for multiple cells refers, for example, in the case of CA including component carriers (CC)#1, CC#2, and CC#3, using the DCI transmitted from base station 20 to terminal 10 via CC#1, to schedule the transmission of PUSCH and / or reception of PDSCH in terminal 10 via CC#2, and / or the transmission of PUSCH and / or reception of PDSCH in terminal 10 via CC#3. Figure 2 The example shows three component carriers, but the number of component carriers is not limited to three. For example, the number of component carriers can be two, or the number of component carriers can be greater than three.

[0050] (DCI format 1_1 / 0_1)

[0051] The DCI is transmitted via the PDCCH. DCI format 1_1 can be used for downlink scheduling assignment of terminal 10. For example, DCI format 1_1 can include a DCI format identifier, resource information, information associated with transport blocks, information associated with Hybrid Automatic Repeat Request (HARQ), information associated with multiple antennas, and information associated with the Physical Uplink Control Channel (PUCCH), etc.

[0052] For example, DCI format 1_1 can include carrier indicator, bandwidth-part indicator, frequency-domain resource allocation, time-domain resource allocation, VRB-to-PRB mapping, PRB size indicator, reserved resources, zero-power CSI-RS trigger, etc., as resource information.

[0053] DCI format 1-1 includes a Carrier indicator field (CIF) indicating that cross-carrier scheduling is configured. The Carrier indicator in the CIF contains either 0 or 3 bits and is used to represent the component carriers associated with the DCI.

[0054] The Bandwidth-part indicator field in DCI format 1_1 is used to activate one of the four largest bandwidth parts. The number of bits in the Bandwidth-part indicator can be any number from 0 to 2 bits. Additionally, the value of the Bandwidth part indicator field can be, for example, the BWP ID.

[0055] In order to perform uplink scheduling assignment on terminal 10, DCI format 0_1 ​​can be used. For example, DCI format 0_1 ​​can contain DCI format identifier, resource information, information associated with transport blocks, information associated with HARQ, information associated with multiple antennas, information associated with power control, etc.

[0056] For example, DCI format 0-1 can include Carrier indicator, UL / SUL indicator, Bandwidth-part indicator, Frequency-domain resource allocation, Time-domain resource allocation, Frequency-hopping flag, etc., as resource information.

[0057] The DCI format 0-1 containing a CIF indicates that cross-carrier scheduling is configured. The number of bits in the Carrier indicator contained in the CIF is 0 or 3 bits, and it is used to represent the component carriers associated with the DCI.

[0058] The DCI format 0-1 Bandwidth-part indicator field is used to activate one of the four largest bandwidth parts. The number of bits in the bandwidth-part indicator can be any number from 0 to 2 bits.

[0059] (Bandwidth-part indicator field)

[0060] As described above, the Bandwidth-part indicator field can be included in both DCI format 1-1 and DCI format 0-1. The size of the Bandwidth-part indicator field is 0 bits, 1 bit, or 2 bits, depending on the number of Bandwidth-parts set by the higher layer. The maximum number of Bandwidth-parts (BWPs) set is four. Therefore, if the number of BWPs set by the higher layer is three or four, the size of the Bandwidth-part indicator field is 2 bits. If the number of BWPs set by the higher layer is two, the size of the Bandwidth-part indicator field is 1 bit. If the number of BWPs set by the higher layer is one, the size of the Bandwidth-part indicator field is 0 bits.

[0061] In DCI format 1_1, the Bandwidth-part indicator field represents the active downlink BWP. In DCI format 0_1, the Bandwidth-part indicator field represents the active uplink BWP.

[0062] When cross-carrier scheduling is configured, the Bandwidth-part indicator field is interpreted by terminal 10 as representing the BWP of the scheduled cell.

[0063] (BWP indication)

[0064] The following section examines the specific structure of the BWP indication field in the case of scheduling multiple cells. For example, it can be determined whether and how the active BWP is specified through the BWP indication field for multiple cells scheduled by base station 20. Alternatively, it can be determined whether and how the active BWP is specified through the BWP indication field for one of the multiple cells scheduled by base station 20. Furthermore, in the embodiments described below, the number of CCs scheduled by a single DCI is two, but the number of CCs scheduled by a single DCI is not limited to two. The number of CCs scheduled by a single DCI may be one, or it may be more than two.

[0065] (Proposal 1)

[0066] When base station 20 schedules multiple cells, the BWP indication field can be used to specify the active BWP for each of the multiple cells. Terminal 10 can activate the BWP specified by the BWPindication field for each of the multiple cells.

[0067] (Proposal 1-1)

[0068] In the case where base station 20 schedules multiple cells, for example, the BWP indication field can be extended to X bits. Here, X can be {0, 1, or 2} + {0, 1, or 2}, depending on the number of downlink (or uplink) BWPs configured in each scheduled cell. That is, for example, X can be the sum of the number of bits required to specify the activated BWP in each of the multiple cells. Furthermore, X can be determined based on the number of scheduled cells.

[0069] For example, in Figure 2In the example shown, it is assumed that the DCI sent from base station 20 via PDCCH through CC#1 schedules the transmission of PDSCH (or PUSCH) of CC#2 and CC#3 for terminal 10. Furthermore, it is assumed that the higher layer configures two BWPs for CC#2 and four BWPs for CC#3. In this case, in addition to the 1 bit specifying the BWP active in CC#2, the BWP indication field of the DCI may also include 2 bits specifying the BWP active in CC#3, i.e., a total of 3 bits. Terminal 10, receiving the DCI via PDCCH through CC#1, can select the BWP active in CC#2 based on the value of the 1 bit specifying the BWP active in CC#2 contained in the BWPindication field of the DCI, and select the BWP active in CC#3 based on the value of the 2 bits specifying the BWP active in CC#3 contained in the BWP indication field. Additionally, in the above example, the DCI can be either DCI format 1-1 or DCI format 0-1. For example, if the DCI is DCI format 1-1, the downlink BWP can be activated in each CC. Furthermore, for example, if the DCI is DCI format 0-1, the uplink BWP can be activated in each CC.

[0070] (Proposal 1-2)

[0071] In the case where base station 20 schedules multiple cells, the BWP indication field can be extended to Y bits, for example. Figure 3 As shown, a table can be defined to specify the association between the bit values ​​of the BWP indicator field and the BWP specified in each CC. For example, as... Figure 3As shown, Y represents the required number of BWPs that can be activated in the first CC and the combination of BWPs that can be activated in the second CC. In this case, an association can be defined between the bit value of the BWP indicator field and the combination of BWPs activated in each CC, such that the BWPs activated in the first CC and the BWPs activated in the second CC are specified by specifying the bit value of the BWP indicator field. This association can be specified in advance by the specification or set by a higher layer. Additionally, in the example above, the DCI can be DCI format 1_1 or DCI format 0_1. For example, if the DCI is DCI format 1_1, the downlink BWP can be activated in each CC. Furthermore, for example, if the DCI is DCI format 0_1, the uplink BWP can be activated in each CC.

[0072] (Proposal 1-3)

[0073] When base station 20 schedules multiple cells, the size of the BWP indication field may not be expanded. For example, the size of the BWP indication field can be 0 bits, 1 bit, or 2 bits. For example, when the first CC and the second CC are scheduled through a single DCI, an association can be defined between the bit values ​​set in the BWP indication field and the combination of active BWPs in each CC, so that the combination of active BWPs in the BWPs set in the first CC and the active BWPs in the BWPs set in the second CC is specified according to the bit values ​​set in the BWP indication field. This association can be specified in advance by the specification or set by higher layers. In this case, the size of the BWP indication field can be determined in advance, set by higher layers, or set to the maximum or minimum number of the number of BWPs set in the first CC and the number of BWPs set in the second CC.

[0074] Additionally, in the above example, the DCI can be either DCI format 1-1 or DCI format 0-1. For example, if the DCI is DCI format 1-1, the downlink BWP can be activated in each CC. Furthermore, for example, if the DCI is DCI format 0-1, the uplink BWP can be activated in each CC.

[0075] (Proposal 1')

[0076] In Proposals 1-2 and 1-3 above, the bit values ​​for the BWP indication field can be defined to represent the BWP that remains unchanged after activation in the first CC and / or after activation in the second CC. Alternatively, in Proposals 1-2 and 1-3 above, a new field can be set to represent the BWP that remains unchanged after activation in the first CC and / or after activation in the second CC.

[0077] (Proposal 2)

[0078] When base station 20 schedules multiple cells, the BWP to be activated can be specified for one of the multiple cells using the BWP indication field. Terminal 10 can activate the BWP specified for that one of the multiple cells using the BWP indication field.

[0079] (Proposal 2-1)

[0080] When base station 20 schedules multiple cells, the BWP indication field can be extended to X bits, for example. Here, X can be the maximum number of downlink (or uplink) BWPs set in each scheduled cell plus (1 or 2).

[0081] For example, if X is the maximum number of BWPs set in each scheduled cell plus 1, a cell can be specified to terminal 10 by one bit of the BWP indication field (e.g., 1MSB (Most Significant Bit) or 1LSB (Least Significant Bit)). This cell is the cell for which the active BWP is specified. In this case, terminal 10 can assume that it will not change the BWP for other cells among the multiple cells.

[0082] For example, if X is the maximum number of BWPs set in each scheduled cell plus 2, the terminal 10 can specify the cell for which the active BWP is specified by two bits of the BWP indication field (e.g., 2MSB or 2LSB).

[0083] (Proposal 2-2)

[0084] When a base station schedules multiple cells, the size of the BWP indication field may not be expanded. For example, the size of the BWP indication field can be 0 bits, 1 bit, or 2 bits. Alternatively, the size of the BWP indication field can be determined based on the number of downlink (or uplink) BWPs configured in the specific cell being scheduled.

[0085] (Proposal 2-2-1)

[0086] In Proposal 2-2 above, the specific cell to be scheduled can be the cell with the smallest serving cell index among multiple cells to be scheduled.

[0087] (Proposal 2-2-2)

[0088] In Proposal 2-2 above, the specific cell to be scheduled can be the cell with the largest number of downlink (or uplink) BWPs among multiple cells to be scheduled.

[0089] (Proposal 2-2-3)

[0090] In Proposal 2-2 above, the specific cell to be scheduled can be determined through RRC configuration.

[0091] In addition, in the above-mentioned proposals 2-2-1 to 2-2-3, for cells other than specific cells among the multiple cells being scheduled, terminal 10 may assume that the active BWP is not changed.

[0092] (Proposal 2')

[0093] When base station 20 schedules multiple cells, if one of the cells being scheduled is the cell being scheduled (i.e., when the cell being scheduled performs its own scheduling and scheduling toward other cells through a single DCI), the BWP indication field can be used to specify the activated BWP for the cell being scheduled, but the BWP indication field cannot be used to specify the activated BWP for cells other than the cell being scheduled among the multiple cells being scheduled.

[0094] (Proposal 3)

[0095] When base station 20 schedules multiple cells, BWPindication for those multiple cells may not be necessary. For example, when base station 20 schedules multiple cells, terminal 10 can assume that the BWPindication field is set to zero for all cells.

[0096] (Proposal 3-1)

[0097] In the case of Proposal 3 above, terminal 10 can be assumed to have a BWP indication field size of 0 bits, and terminal 10 can be assumed to not change the activated BWP for each of the multiple scheduled cells.

[0098] (Proposal 3-2)

[0099] In the case of Proposal 3 above, terminal 10 can assume that the size of the BWP indication field is 0 bits, 1 bit, or 2 bits. In this case, terminal 10 can ignore the BWP indication field, and for each of the multiple cells being scheduled, terminal 10 can assume that it will not perform any changes to the activated BWP.

[0100] (Proposal 4)

[0101] When base station 20 schedules multiple cells, terminal 10 can switch whether to enable BWP indication via RRC signaling. For example, terminal 10 can be configured with any of the above-mentioned proposals 1 to 3 via RRC signaling.

[0102] (Proposal 5)

[0103] When base station 20 schedules multiple cells, the number of BWPs set is the same among the scheduled cells, and in the case that the BWPs with the same identifier are activated simultaneously in the scheduled cells, the value represented by the BWP indication field can be applied to the scheduled cells together.

[0104] (Proposal 6)

[0105] When a base station schedules multiple cells, the Carrier Indicator Field (CIF) and the BWP Indicator Field can be jointly encoded. For example, ... Figure 4As shown, the association between the (CIF+BWP) bit field and the specified component carrier and the specified BWP within the specified component carrier can be defined. In this case, for example, base station 20 notifies terminal 10 of the (CIF+BWP) bit by including the (CIF+BWP) bit field in the DCI. Terminal 10, upon receiving the (CIF+BWP) bit, can then... Figure 4 The correspondence shown activates the specified BWP in the specified component carrier.

[0106] (Proposal 6')

[0107] When base station 20 schedules multiple cells, when setting Supplementary Uplink (SUL) for terminal 10, the Carrier Indicator Field (CIF), BWP Indication Field, and SUL Field can be jointly encoded. For example, the association between the (CIF+BWP+SUL) bit field and the specified component carrier, the specified BWP in the specified component carrier, the component carrier of the specified SUL, and the specified BWP in the component carrier of the specified SUL can be defined. In this case, for example, base station 20 notifies terminal 10 of the (CIF+BWP+SUL) bit by including the (CIF+BWP+SUL) bit in the DCI. Terminal 10, upon receiving the (CIF+BWP+SUL) bit, can activate the specified BWP in the specified component carrier and in the component carrier of the specified SUL according to the above association.

[0108] (Device Structure)

[0109] Next, an example of the functional structure of the terminal 10 and base station 20 performing the processing operations described above will be explained. The terminal 10 and base station 20 have all the functions described in this embodiment. However, the terminal 10 and base station 20 may also have only a portion of the functions described in this embodiment. Furthermore, the terminal 10 and base station 20 may be collectively referred to as a communication device.

[0110] <Terminal>

[0111] Figure 5 This is a diagram illustrating an example of the functional structure of terminal 10. (As shown...) Figure 5 As shown, terminal 10 has a transmitting unit 110, a receiving unit 120, and a control unit 130. Figure 5The functional structure shown is only one example. The functional divisions and names of the functional units can be arbitrary, as long as the operations involved in this embodiment can be performed. Furthermore, the transmitting unit 110 can be called a transmitter, and the receiving unit 120 can be called a receiver.

[0112] The transmitting unit 110 generates a transmission signal based on the transmission data and transmits the transmission signal wirelessly. Furthermore, the transmitting unit 110 can form one or more beams. The receiving unit 120 wirelessly receives various signals and obtains higher-layer signals from the received physical layer signals. Furthermore, the receiving unit 120 includes a measurement unit for measuring the received signals and obtaining the received power, etc.

[0113] The control unit 130 controls the terminal 10. Alternatively, the functions of the control unit 130 related to transmission can be included in the transmission unit 110, and the functions of the control unit 130 related to reception can be included in the reception unit 120.

[0114] For example, the receiving unit 120 receives a DCI including scheduling information from the base station 20 via the PDCCH. The control unit 130 selects the BWP activated in each component carrier based on the value set in the BWP indication field contained in the DCI.

[0115] <Base Station 20>

[0116] Figure 6 This is a diagram illustrating an example of the functional structure of base station 20. (As shown...) Figure 6 As shown, the base station 20 has a transmitting unit 210, a receiving unit 220 and a control unit 230. Figure 6 The functional structure shown is only one example. The functional divisions and names of the functional units can be arbitrary, as long as the actions involved in this embodiment can be performed. Furthermore, the transmitting unit 210 can be referred to as a transmitter, and the receiving unit 220 as a receiver.

[0117] The transmitting unit 210 includes the function of generating a signal to be transmitted to the terminal 10 and transmitting the signal wirelessly. The receiving unit 220 includes the function of receiving various signals transmitted from the terminal 10 and obtaining, for example, higher-level information from the received signals. In addition, the receiving unit 220 includes a measurement unit for measuring the received signal and obtaining the received power, etc.

[0118] The control unit 230 controls the base station 20. Furthermore, the functions of the control unit 230 related to transmission can be included in the transmission unit 210, and the functions of the control unit 230 related to reception can be included in the reception unit 220.

[0119] For example, in the case of scheduling for multiple cells, the control unit 230 generates a BWP indication field that includes information for specifying the BWP activated in each component carrier, and includes the BWP indication field in the DCI that includes scheduling information. The transmission unit 210 transmits the DCI generated by the control unit 230 via the PDCCH.

[0120] (Hardware Structure)

[0121] The block diagram used in the description of the above embodiments ( Figures 5-6 The diagram illustrates blocks organized by function. These functional blocks (structural units) are implemented through any combination of hardware and / or software. Furthermore, there are no particular limitations on the implementation method of each functional block. That is, each functional block can be implemented using a single device that is physically and / or logically combined, or it can be implemented by directly and / or indirectly (e.g., using wired and / or wireless) connecting two or more devices that are physically and / or logically separate.

[0122] Furthermore, for example, in one embodiment of the present invention, the terminal 10 and the base station 20 can both function as computers performing the processing involved in this embodiment. Figure 7 This diagram illustrates an example of the hardware structure of the terminal 10 and base station 20 according to this embodiment. The terminal 10 and base station 20 described above may also be configured as computer devices that physically include a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007, etc.

[0123] Additionally, in the following description, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware structure of terminal 10 and base station 20 can be configured to include one or more of the devices shown in figures 1001-1006, or it can be configured not to include any of the devices.

[0124] The functions in terminal 10 and base station 20 are implemented by reading predetermined software (programs) into hardware such as processor 1001 and memory 1002, so that processor 1001 performs calculations and controls the communication of communication device 1004, and the reading and / or writing of data in memory 1002 and storage 1003.

[0125] The processor 1001 controls the computer as a whole, for example, by enabling the operating system to function. The processor 1001 may also be a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic units, registers, etc.

[0126] Furthermore, the processor 1001 reads programs (program code), software modules, or data from the memory 1003 and / or communication device 1004 to the memory 1002, and performs various processes accordingly. As a program, a program is used that causes the computer to perform at least a portion of the actions described in the above embodiments. For example, Figure 5 The transmitting unit 110, receiving unit 120, and control unit 130 of the terminal 10 shown can be implemented using a control program stored in the memory 1002 and operated by the processor 1001. Furthermore, for example, Figure 6 The transmitting unit 210, receiving unit 220, and control unit 230 of the base station 20 shown can also be implemented using a control program stored in the memory 1002 and operated by the processor 1001. Regarding the various processes described above, although it has been stated that they are executed by one processor 1001, they can also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be installed using more than one chip. Furthermore, the program can be transmitted from the network via a telecommunications line.

[0127] Memory 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. Memory 1002 may also be referred to as a register, cache, main memory (main storage device), etc. Memory 1002 can store programs (program code), software modules, etc., that are executable for carrying out the processing involved in one embodiment of the present invention.

[0128] The memory 1003 is a computer-readable recording medium, which may be composed of at least one of the following: CD-ROM (Compact Disc ROM) or other optical discs, hard disks, floppy disks, magneto-optical discs (e.g., compact discs, digital multipurpose discs, Blu-ray discs, smart cards, flash memory (e.g., cards, sticks, key drives), floppy disks, magnetic stripes, etc. The memory 1003 may also be referred to as an auxiliary storage device. The aforementioned storage medium may be, for example, other suitable media such as databases or servers that include memory 1002 and / or memory 1003.

[0129] The communication device 1004 is hardware (transceiver) used for communication between computers via wired and / or wireless networks. For example, it may also be called a network device, network controller, network interface card (NIC), communication module, etc. For instance, the transmitting unit 110 and receiving unit 120 of terminal 10 can be implemented using the communication device 1004. Furthermore, the transmitting unit 210 and receiving unit 220 of base station 20 can also be implemented using the communication device 1004.

[0130] Input device 1005 is an input device that accepts input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, LED, etc.). Alternatively, input device 1005 and output device 1006 can also be integrated (e.g., a touch panel).

[0131] Furthermore, devices such as processor 1001 and memory 1002 are connected via bus 1007 for communicating information. Bus 1007 can be configured using a single bus or different buses can be used between devices.

[0132] Furthermore, terminal 10 and base station 20 can be configured to include hardware such as microprocessors, digital signal processors (DSPs), ASICs (Application Specific Integrated Circuits), PLDs (Programmable Logic Devices), and FPGAs (Field Programmable Gate Arrays), and can also use this hardware to implement part or all of the functional blocks. For example, processor 1001 can also be installed using at least one of these hardware components.

[0133] (Summary of Implementation Methods)

[0134] This specification discloses at least the following terminals and communication methods.

[0135] A terminal includes: a receiving unit that receives scheduling information for one or more second component carriers of the plurality of component carriers via a first component carrier constituting carrier aggregation; and a control unit that activates any one of a plurality of BWPs set for the one or more second component carriers based on identification information of a bandwidth part (BWP) included in the scheduling information.

[0136] Based on the above structure, the terminal can select the active BWP according to the BWP identification information contained in the scheduling information.

[0137] The identification information of the BWP may include information about any one of a plurality of BWPs that are set for each component carrier in the one or more second component carriers.

[0138] Based on the above structure, the terminal can select the BWP that is activated in each component carrier according to the BWP identification information contained in the scheduling information.

[0139] The one or more second component carriers may be composed of two component carriers. The identification information of the BWP includes identification information of any combination of all combinations of BWPs that can be set for one of the two component carriers and BWPs that can be set for the other of the two component carriers. The bit size of the identification information of the BWP is based on the number of all combinations.

[0140] Based on the above structure, when specifying the BWP activated in each component carrier according to the BWP identification information contained in the scheduling information, the number of bits of the BWP identification information can be reduced.

[0141] At least one of the most significant bit and the least significant bit of the multiple bits constituting the identification information of the BWP may be information that specifies one or more component carriers of the one or more second component carriers.

[0142] Based on the above structure, when specifying a BWP activated in any component carrier according to the BWP identification information contained in the scheduling information, the number of bits of the BWP identification information can be reduced.

[0143] A communication method performed by a terminal includes the following steps: receiving scheduling information for one or more second component carriers of a plurality of component carriers constituting carrier aggregation via a first component carrier; and activating any one of a plurality of BWPs set for the one or more second component carriers based on identification information of a bandwidth part (BWP) included in the scheduling information.

[0144] Based on the above structure, the terminal can select the active BWP according to the BWP identification information contained in the scheduling information.

[0145] (Supplement to the implementation method)

[0146] The embodiments of the present invention have been described above, but the disclosed invention is not limited to such embodiments. Those skilled in the art should understand various modifications, alterations, substitutions, and replacements. Specific numerical examples have been used to facilitate understanding of the invention, but unless otherwise specified, these values ​​are merely examples, and any appropriate values ​​may be used. The distinctions between items in the above description are not essential to the present invention; items described in two or more items may be combined as needed, and items described in one item may be applied to items described in other items (as long as there is no contradiction). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. The operation of multiple functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by multiple components. Regarding the processing procedures described in the embodiments, the order of processing may be interchanged unless there is a contradiction. For ease of explanation, terminal 10 and base station 20 have been described using functional block diagrams, but such a device may also be implemented in hardware, software, or a combination thereof. Software operating via a processor in terminal 10 according to an embodiment of the present invention and software operating via a processor in base station 20 according to an embodiment of the present invention may respectively be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server and other suitable storage media.

[0147] The notification of information is not limited to the forms / implementations described in this specification, and other methods may also be used. For example, information notification may be implemented through physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer 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 combinations thereof. Furthermore, RRC signaling may be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0148] The various forms / implementations described in this specification can also be applied to LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), systems using other suitable systems, and / or next-generation systems extended therefrom.

[0149] The processing procedures, timing, and flow of the various forms / implementations described in this specification may be rearranged in order, provided there is no contradiction. For example, the elements of various steps are indicated using an illustrative order for the methods described in this specification, but are not limited to the specific order indicated.

[0150] In this specification, certain actions performed by base station 20 may sometimes be performed through its upper node, depending on the circumstances. In a network consisting of one or more network nodes including base station 20, it is obvious that various actions performed to communicate with terminal 10 can be performed by base station 20 and / or other network nodes besides base station 20 (e.g., considering MME or S-GW, but not limited to these). The above example illustrates a single network node other than base station 20, but other network nodes can also be a combination of multiple other network nodes (e.g., MME and S-GW).

[0151] The various forms / implementations described in this specification can be used individually or in combination, and can also be switched depending on the execution.

[0152] For terminal 10, 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, handheld device, user agent, mobile client, client, or some other appropriate terms.

[0153] For base station 20, those skilled in the art sometimes also refer to it by the following terms: NB (NodeB), eNB (enhanced NodeB), base station, gNB, or some other appropriate terms.

[0154] The Bandwidth Part (BWP) (also known as partial bandwidth, etc.) represents a subset of contiguous common resource blocks (RBs) used for a specific parameter set within a given carrier. Here, common RBs can be determined by indexing RBs based on a common reference point of that carrier. PRBs are defined and numbered within a given BWP.

[0155] A BWP can include a UL BWP and a DL BWP. One or more BWPs can be set for a UE within one carrier.

[0156] At least one of the configured BWPs can be active, and it is not assumed that the UE will transmit or receive predetermined signals / channels outside of an active BWP. Furthermore, the terms "cell," "carrier," etc., used in this disclosure can be replaced with "BWP."

[0157] The terms "determining" and "determining" used in this specification sometimes encompass a variety of actions. For example, "determining" and "determining" can include actions such as judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), and ascertaining, which are considered as actions of "determining" and "determining." Furthermore, "determining" and "determining" can include actions such as receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, and accessing (e.g., accessing data in memory), which are considered as actions of "determining" and "determining." Additionally, "determining" and "determining" can include actions such as resolving, selecting, choosing, establishing, and comparing, which are considered as actions of "determining" and "determining." In other words, "determining" and "determining" can include actions that involve "determining" or "determining" any action.

[0158] The use of the word "based on" in this specification, unless otherwise expressly stated, does not mean "based on only". In other words, the use of the word "based on" means both "based on only" and "based on at least".

[0159] When the terms "include," "including," and variations thereof are used in this specification or claims, these terms, like the term "comprising," imply inclusion. Furthermore, the term "or" as used in this specification or claims means not XOR.

[0160] In the entirety of this disclosure, for example, in cases where articles are added through translation, such as a, an, and the in English, multiple articles can be included unless the context explicitly indicates otherwise.

[0161] The present invention has been described in detail above, but it will be clear to those skilled in the art that the invention is not limited to the embodiments described in this specification. The invention can be practiced in modified and altered ways without departing from the spirit and scope of the invention as defined by the claims. Therefore, the purpose of this specification is illustrative and it is not intended to limit the scope of the invention.

[0162] Label Explanation:

[0163] 10 User Equipment

[0164] 110 Dispatch Department

[0165] 120 Receiving Department

[0166] 130 Control Department

[0167] 20 base stations

[0168] 210 Sending Department

[0169] 220 Receiving Department

[0170] 230 Control Department

[0171] 1001 processor

[0172] 1002 memory

[0173] 1003 Memory

[0174] 1004 Communication device

[0175] 1005 Input Device

[0176] 1006 Output Device

Claims

1. A terminal, the terminal having: The receiving unit receives a single first downlink control information, i.e., the first DCI, for scheduling across multiple cells; and The control unit, based on the single Bandwidth Part Indicator field (BWP indicator field) included in the first DCI, sets the BWP to be activated in the plurality of cells. The number of BWPs is set by the higher-level management. The control unit determines the bit size of the single BWP indicator field as the maximum value among the BWP numbers set for each of the multiple cells. The receiving unit also receives a second DCI for scheduling a cell. The bit size of the BWP indicator field included in the second DCI and the bit size of the BWP indicator field included in the first DCI are both 0 bits, 1 bit, or 2 bits.

2. The terminal according to claim 1, wherein, The terminal also has a transmitting unit that uses the activated BWP to transmit PUSCH in the plurality of cells.

3. A communication method for a terminal, comprising the following steps: The receiving step involves receiving a single first downlink control information (i.e., the first DCI) for scheduling across multiple cells; and The control step involves setting the BWP to be activated in the plurality of cells based on the single Bandwidth Part Indicator field, i.e., the BWP indicator field, contained in the first DCI. In the control steps described above, the BWP number is set by a higher layer. In the control step, the bit size of the single BWP indicator field is determined to be the maximum value among the BWP numbers set for each of the plurality of cells. In the receiving step, a second DCI for scheduling a cell is also received. The bit size of the BWP indicator field included in the second DCI and the bit size of the BWP indicator field included in the first DCI are both 0 bits, 1 bit, or 2 bits.

4. A base station, the base station having: The control unit, in a single first downlink control message (DCI) used for scheduling across multiple cells, uses a single bandwidth portion indicator field (BWP indicator field) to set the BWP to be activated in the multiple cells. The transmitting unit transmits the single first DCI for scheduling across multiple cells. The control unit sets the BWP number through a higher-level configuration. The control unit sets the bit size of the single BWP indicator field to the maximum value among the BWP numbers set for each of the plurality of cells. The transmitting unit also transmits a second DCI for scheduling a cell. The bit size of the BWP indicator field included in the second DCI and the bit size of the BWP indicator field included in the first DCI are both 0 bits, 1 bit, or 2 bits.

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