Terminal, base station, wireless system, and communication method

Abstract

This terminal includes: a reception unit that receives a downlink control signal relating to power saving in a base station; and a control unit that switches a secondary cell to a primary cell on the basis of the downlink control signal.

Description

Terminal, base station, and communication method

[0001] The present disclosure relates to a terminal, a base station, and a communication method.

[0002] The 3rd Generation Partnership Project (3GPP) has developed specifications for the 5th generation mobile communication system (also known as 5G, New Radio (NR), or Next Generation (NG)), and is also developing specifications for the next generation, known as Beyond 5G, 5G Evolution, or 6G.

[0003] For 5G, technologies that satisfy the requirements such as a large-capacity system, high-speed data transmission speed, low latency, simultaneous connection of a large number of terminals, low cost, and low power consumption are being considered (for example, Non-Patent Document 1).

[0004] Also, in 3GPP Release 18, power saving of base stations is being considered (for example, Non-Patent Document 2). Details are a topic for future study.

[0005] 3GPP TS 38.300 V17.0.0 (2022-03)“New SI: Study on network energy savings for NR”, RP-213554, 3GPP TSG RAN Meeting #94e, 3GPP, December 2021

[0006] As described above, power saving in base stations is an issue that needs to be considered, but sufficient consideration has not been given to how to specifically implement control relating to this power saving.

[0007] One aspect of the present disclosure is to provide a terminal, a base station, and a communication method that can save power in the base station.

[0008] A terminal according to one aspect of the present disclosure includes a receiver that receives a downlink control signal related to power saving of a base station, and a controller that switches a secondary cell to a primary cell based on the downlink control signal.

[0009] A base station according to one aspect of the present disclosure has a control unit that determines a secondary cell to be switched to a primary cell, and a transmission unit that transmits information about the secondary cell using a downlink control signal related to power saving of the base station.

[0010] In a communication method according to one aspect of the present disclosure, a terminal receives a downlink control signal related to power saving of a base station, and switches a secondary cell to a primary cell based on the downlink control signal.

[0011] In a communication method according to one aspect of the present disclosure, a base station determines a secondary cell to be switched to as a primary cell, and transmits information about the secondary cell using a downlink control signal related to power saving of the base station.

[0012] FIG. 1 is a diagram illustrating an example of a wireless communication system according to an embodiment. FIG. 1 is a diagram illustrating an example of activation and deactivation by a MAC CE. FIG. 2 ... an RRC. FIG. 3 is a diagram illustrating an example of activation and deactivation by an RRC. FIG. 4 is a diagram illustrating a parameter SCellIndex. FIG. 5 is a diagram illustrating a parameter ServCellIndex. FIG. 6 is a diagram illustrating an SCell dormancy indication. FIG. 7 is a diagram illustrating an example of cell deactivation of a base station. FIG. 8 is a diagram illustrating an example of an operation of Proposal 1. FIG. 9 is a diagram illustrating an example of higher layer parameters. FIG. 10 is a diagram illustrating an example of RRC parameters. FIG. 11 is a block diagram illustrating an example of the configuration of a base station according to an embodiment. FIG. 12 is a block diagram illustrating an example of the configuration of a terminal according to an embodiment. FIG. 13 is a diagram illustrating an example of the hardware configuration of a base station and a terminal according to the present embodiment. FIG. 14 is a diagram illustrating an example of the configuration of a vehicle.

[0013] Hereinafter, an embodiment according to one aspect of the present disclosure will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present disclosure is applied is not limited to the following embodiment.

[0014] Existing technologies may be used as appropriate for operation of the wireless communication system according to the embodiments of the present disclosure. The existing technologies may be, but are not limited to, existing NR or LTE. Furthermore, the term "LTE" as used herein has a broad meaning, including LTE-Advanced and systems beyond LTE-Advanced (e.g., NR), unless otherwise specified.

[0015] Furthermore, in the embodiments of the present disclosure, the duplex method may be a time division duplex (TDD) method, a frequency division duplex (FDD) method, or another method (for example, flexible duplex, etc.).

[0016] Furthermore, in the embodiments of the present disclosure, "configuring" radio parameters and the like may mean that predetermined values ​​are pre-configured, or that radio parameters notified from a base station or a terminal are set.

[0017] <System Configuration> Fig. 1 is a diagram showing an example of a wireless communication system according to an embodiment. In the example of Fig. 1, a base station 10-1 may be a Master Node (MN). A base station 10-2 may be a Secondary Node (SN). As shown in the example of Fig. 1, in dual connectivity (DC), carriers between different base stations may be aggregated.

[0018] 1, the base station 10-1 communicates with the terminal 20 via a primary cell (PCell) and a secondary cell (SCell). In the example of Fig. 1, the terminal 20 establishes an RRC connection with the base station 10-1.

[0019] In the case of DC, since there may be a delay in communication between the base station 10-1 and the base station 10-2, it is difficult to notify the base station 10-2 of uplink control information (e.g., UCI) received on the PCell of the base station 10-1 via a backhaul link (e.g., a wired or wireless link connecting the base station 10-1 and the base station 10-2) and reflect the information in the scheduling of the SCell under the control of the base station 10-2. Therefore, in DC, in addition to the PCell of the base station 10-1, one carrier under the control of the base station 10-2 may be set as a Primary SCell (PSCell), and PUCCH transmission may be supported by the PSCell. In this case, the terminal 20 transmits UCI to the base station 10-2 via the PSCell.

[0020] In the example of FIG. 1, the terminal 20 configures an SCell in addition to a PCell for the base station 10-1. Furthermore, the terminal 20 configures an SCell in addition to a PSCell for the base station 10-2. The terminal 20 transmits UCI of each carrier under the control of the base station 10-1 on the PUCCH of the PCell. Furthermore, the terminal 20 transmits UCI of each carrier under the control of the base station 10-2 on the PUCCH of the PSCell. In the example of FIG. 1, the cell group (CG) under the control of the base station 10-1 may be referred to as a Master Cell-Group (MCG). The cell group under the control of the base station 10-2 may be referred to as a Secondary Cell-Group (SCG).

[0021] When DC is performed, terminal 20 may transmit PUCCH via PCell, PSCell, and / or PUCCH-SCell. In general, it is not expected that terminal 20 transmits PUCCH via SCell other than PCell, PSCell, and PUCCH-SCell.

[0022] <SCell activation / deactivation> 3GPP specifies activation and deactivation of SCells. For example, SCells are activated and deactivated by MAC CE and / or RRC. MAC CE stands for Medium Access Control - Control Element. RRC stands for Radio Resource Control.

[0023] Activation and deactivation by MAC CE will be described below with reference to Figures 2A and 2B, and activation and deactivation by RRC will be described with reference to Figures 3A and 3B.

[0024] Activation and deactivation by MAC CE Figures 2A and 2B are diagrams illustrating an example of activation and deactivation by MAC CE. Figures 2A and 2B show fields of MAC CE (see, for example, section 6.1.3.10 of 3GPP TS 38.321 V17.0.0). Each C shown in Figures 2A and 2B i (i is a positive integer) corresponds to an SCell index that identifies an SCell. As will be described below, the SCell index is set by a parameter SCellIndex of higher layer signaling such as RRC.

[0025] For example, as shown in Figure 2A, up to seven SCells are activated and deactivated by the MAC CE. i Set "1" to C i For example, the base station activates the SCell with the SCell index corresponding to C i Set "0" to C i The terminal deactivates an SCell having an SCell index corresponding to the SCell index. The terminal activates and deactivates an SCell based on an instruction (MAC CE) from the base station.

[0026] For example, as shown in Figure 2B, a maximum of 31 SCells are activated and deactivated by the MAC CE. i Set "1" to C iFor example, the base station activates the SCell with the SCell index corresponding to C i Set "0" to C i The terminal deactivates an SCell having an SCell index corresponding to the SCell index. The terminal activates and deactivates an SCell based on an instruction from the base station.

[0027] 3A and 3B are diagrams illustrating an example of activation and deactivation by RRC. The activation and deactivation of an SCell are configured by higher layer parameters such as RRC (see, for example, Section 6.3 of 3GPP TS 38.331 V17.0.0).

[0028] For example, as shown in Figure 3A, the state of the SCell is set by the parameter sCellState. For example, if the parameter sCellState is set as "activated", the SCell is activated.

[0029] For example, as shown in Fig. 3B, a timer for deactivating an SCell is set for each SCell by a parameter sCellDeactivationTimer. For example, an SCell is deactivated when the timer set by the parameter sCellDeactivationTimer expires.

[0030] <Cell Index> The following describes the cell index. A cell index that identifies a cell is set in a terminal by higher layer parameters such as RRC. Parameters that set the cell index include, for example, the SCellIndex parameter and the ServCellIndex parameter (see, for example, Section 6.3 of 3GPP TS 38.331 V17.0.0).

[0031] 4A is a diagram illustrating the parameter SCellIndex. When multiple SCells are configured, the SCells are managed (identified) by the parameter SCellIndex. For example, when a base station configures multiple SCells for a terminal, the base station configures parameters SCellIndex of 1...31 so that the terminal can identify the multiple SCells.

[0032] 4B is a diagram illustrating the parameter ServCellIndex. Serving cells include PCells and PSCells in addition to SCells. The parameter ServCellIndex is used to uniquely identify a serving cell including a PCell, a PSCell, or an SCell. For example, a base station sets the parameter ServCellIndex as 0...n (n is the number of serving cells - 1) so that a terminal can identify the serving cell.

[0033] Note that the parameter ServCellIndex "0" is applied to the PCell. In other words, the cell with the parameter ServCellIndex "0" is the PCell.

[0034] Furthermore, the parameter ServCellIndex "1...n" is applied to the SCell. One or more of the parameter ServCellIndex corresponds to the parameter SCellIndex described in Fig. 4A. For example, an SCell with a parameter ServCellIndex "1" and an SCell with a parameter SCellIndex "1" indicate the same SCell.

[0035] <SCell dormancy indication> 3GPP defines SCell dormancy indication. For example, a base station uses a lower layer signaling parameter such as DCI to instruct a terminal to dormant or non-dormant an SCell. DCI is an abbreviation for Downlink Control Information.

[0036] For the SCell dormancy indication, for example, DCI format 0_1 / 1_1 / or 2_6 is used as shown in Figures 5A and 5B. In the DCI, a 0-, 1-, 2-, 3-, 4-, or 5-bit field is set to specify the SCell to be dormant.

[0037] When the terminal is instructed to suspend the SCell, the terminal does not monitor the PDCCH, but performs processes such as CSI measurement, AGC of received power, and beam management.

[0038] Furthermore, when the SCell is deactivated, the terminal does not, for example, monitor the PDCCH or measure the CSI, and when the SCell is deactivated, the terminal performs, for example, relaxed RRM measurement.

[0039] Note that PDCCH is an abbreviation for Physical Downlink Control Channel, CSI is an abbreviation for Channel State Information, AGC is an abbreviation for Auto Gain Control, and RRM is an abbreviation for Radio Resource Management.

[0040] <Power saving for base stations> In order to achieve carbon neutrality and the SDGs, it is becoming increasingly important to reduce the power consumption of base stations (networks). However, technology to reduce the power consumption of base stations has not been standardized by 3GPP. SDGs stands for Sustainable Development Goals.

[0041] <Considerations> As mentioned above in <Power saving at base stations>, the importance of energy saving (ES) at base stations is increasing. One way to achieve ES at base stations is, for example, to reduce (deactivate) the base station's cells. For example, by deactivating cells, the base station reduces the amount of communication with terminals and achieves ES.

[0042] Fig. 6 is a diagram illustrating an example of cell deactivation of a base station. CC1 and CC2 shown in Fig. 6 indicate component carriers. CC1 and CC2 may be considered as cells formed by the base station. CC1 and CC2 may also be considered as identification information of the cell as seen from the base station. In Fig. 6, a terminal is represented as UE. UE is an abbreviation for User Equipment.

[0043] The "0" and "1" in parentheses shown in Fig. 6 indicate cell indices configured in the terminal by RRC. The cell index is, for example, the parameter ServCellIndex described above in <Cell index>. As described above, the parameter ServCellIndex "0" is used to identify the PCell, and values ​​other than "0" are used to identify the SCell.

[0044] A cell index is set for each terminal. For example, in Fig. 6, the base station sets cell index "0" for UE#1 in CC1. The base station sets cell index "1" for UE#2 in CC1. That is, the base station sets a PCell for UE#1 and an SCell for UE#2 in CC1.

[0045] 6, for example, the base station configures a cell index of "1" for UE#1 in CC2. The base station configures a cell index of "0" for UE#2 in CC2. That is, the base station configures an SCell for UE#1 and a PCell for UE#2 in CC2.

[0046] Here, in order to realize ES in the base station, it is conceivable to deactivate, for example, one of CC1 and CC2 shown in FIG.

[0047] However, since the cell index is configured for each terminal, a PCell may be configured in a different CC as shown in Fig. 6. Therefore, as described above in <SCell activation / deactivation>, even if an SCell is deactivated in one CC, if a PCell is configured in that CC, that CC (as a whole) cannot be deactivated.

[0048] For example, in Fig. 6, even if the SCell of UE#1 is deactivated to deactivate CC2, CC2 (as a whole) cannot be deactivated because the PCell of UE#2 is configured. Therefore, the base station may not be able to achieve sufficient ES.

[0049] Therefore, the following technology is proposed as a technology for realizing ES of the base station.

[0050] <Proposal 1> PCells configured for different CCs are switched (aggregated) to one CC. For example, a base station aggregates PCells configured for different CCs into one CC.

[0051] Fig. 7 is a diagram illustrating an example of the operation of Proposal 1. As indicated by arrow A7a in Fig. 7, for example, the base station configures cell index "0" for UE#1 in CC1. For example, the base station configures cell index "1" for UE#2 in CC1. That is, the base station configures a PCell for UE#1 and configures an SCell for UE#2 in CC1.

[0052] Also, as shown by arrow A7a in Fig. 7, for example, the base station configures cell index "1" for UE #1 in CC2. For example, the base station configures cell index "0" for UE #2 in CC2. That is, the base station configures an SCell for UE #1 and a PCell for UE #2 in CC2.

[0053] Here, the base station performs PCell switching in response to a trigger such as an ES request from the core network or the amount of communication with the terminal, as indicated by arrow A7b in Fig. 7. For example, the base station performs PCell switching by RRC reconfiguration or dynamic PCell switching of <Proposal 2> described below.

[0054] More specifically, the base station sets the cell index "1" of UE #2 in CC1 to the cell index "0" by RRC reconfiguration or dynamic PCell switching. The base station sets the cell index "0" of UE #2 in CC2 to the cell index "1" by RRC reconfiguration or dynamic PCell switching. By this operation, PCells configured in different CC1 and CC2 are aggregated into one CC1, for example, as shown by arrow A7c in Fig. 7 .

[0055] After aggregating PCells of a terminal into one CC, the base station deactivates all or some of the CCs into which PCells are not aggregated. In other words, the base station deactivates all or some of the CCs that include only SCells.

[0056] For example, the base station deactivates all or some of the CCs in which the PCell is not aggregated by RRC and / or MAC CE described above in <SCell Activation / Deactivation>, or by dynamic cell deactivation of <Proposal 3> described below. More specifically, the base station deactivates CC2 that includes only SCells, as indicated by arrows A7d and A7e in Fig. 7 .

[0057] <Summary of Proposal 1> As described above, the base station aggregates PCells configured for different CCs into one CC. This operation allows the base station to deactivate CCs including SCells to which PCells are not aggregated, thereby reducing the number of CCs and realizing ES.

[0058] Furthermore, since the PCell is left and all or part of the SCell is deactivated, the terminal can achieve ES while maintaining communication with the base station.

[0059] <Proposal 2> The PCell switching described in <Proposal 1> above may be performed by RRC reconfiguration as described in <Proposal 1>.

[0060] However, when PCell switching is performed for multiple terminals through RRC reconfiguration, signaling overhead occurs due to RRC reconfiguration. In addition, the processing time for PCell switching is long, and it takes a long time for PCell switching to be completed.

[0061] Therefore, in Proposal 2, dynamic PCell switching is proposed for PCell switching.

[0062] The PCell is switched by lower layer signaling such as DCI. For example, the base station switches the PCell of the terminal using DCI. The terminal switches the PCell based on the DCI from the base station.

[0063] In <Proposal 2>, the following options 1 and 2 are proposed.

[0064] <Proposal 2 - Option 1> The PCell is switched by UE-specific DCI. In other words, the base station switches the PCell of a terminal for each terminal using UE-specific DCI.

[0065] The RNTI may be an RNTI for a terminal-specific DCI format, such as C-RNTI or MCS-C-RNTI. Alternatively, a new terminal-specific RNTI, such as ES-RNTI, may be introduced (defined). Note that RNTI is an abbreviation for Radio Network Temporary Identifier. C-RNTI is an abbreviation for Cell-RNTI. MCS-C-RNTI is an abbreviation for Modulation Coding Scheme-C-RNTI.

[0066] The DCI format may be, for example, DCI format 0_1 / 0_2 / 1_1 / 1_2, or a new DCI format may be introduced.

[0067] A new field may be introduced in the DCI for PCell switching (Proposal 2 - Option 1a) or an existing field may be used (Proposal 2 - Option 1b).

[0068] <Proposal 2 - Option 1a> If a new field is introduced into DCI for PCell switching, the following Alt. 1 and Alt. 2 are proposed.

[0069] <Proposal 2 - Option 1a - alt.1> A target cell ID indicator field is introduced into the DCI for PCell switching. The target cell ID indicator field indicates the cell ID of the SCell that is changed to the PCell. The cell ID of the SCell that is changed to the PCell is an ID associated with the parameter ServCellIndex or the parameter SCellIndex, and the parameter ServCellIndex or the parameter SCellIndex may be used. Hereinafter, the cell ID of the SCell that is changed to the PCell may be referred to as the target cell ID.

[0070] The base station notifies the terminal of the target cell ID using the target cell ID indicator field, and the terminal switches the SCell to the PCell based on the value of the target cell ID indicator field, i.e., the target cell ID.

[0071] For example, the base station notifies UE #2 of CC1 (CC1 is SCell for UE #2) shown by arrow A7a in Fig. 7 of target cell ID "1" using the target cell ID indicator field. UE #2 notified of target cell ID "1" changes the RRC parameter ServCellIndex "1" corresponding to target cell ID "1" to parameter ServCellIndex "0" and switches the SCell of CC1 to PCell. Also, for example, the terminal changes the parameter ServCellIndex "0" set for the PCell to parameter ServCellIndex "1" based on the target cell ID "1" and switches the PCell of CC2 to SCell.

[0072] The bit width of the target cell ID indicator field may be 0, 1, 2, 3, 4 or 5 bits.

[0073] For example, if the higher layer parameter is not set, the bit width of the target cell ID indicator field may be 0. The higher layer parameter is a parameter indicating the presence or absence of the target cell ID indicator field, and may be referred to as PcellDynamicSwitch.

[0074] If higher layer parameters are configured, the bit width of the target cell ID indicator field may be 1, 2, 3, 4, or 5 bits depending on the number of SCells configured in the terminal. For example, if 12 SCells are configured in the terminal, the bit width of the target cell ID indicator field may be 4 bits.

[0075] <Proposal 2 - Option 1a - alt.2> An NW ES indicator field is introduced into the DCI for PCell switching. NW stands for Network. The NW ES indicator field indicates switching from an SCell to a PCell. A terminal instructed to switch from an SCell to a PCell by the NW ES indicator field switches the SCell indicated by the "parameter EsPCellIndex" described in FIG. 8 to the PCell.

[0076] When the NW ES indicator field is introduced into the DCI for PCell switching, the cell ID (target cell ID) of the SCell to be changed to the PCell is notified by higher layer signaling such as RRC.

[0077] Fig. 8 is a diagram illustrating an example of higher layer parameters. The target cell ID is notified from the base station to the terminal by, for example, the parameter EsPCellIndex shown in Fig. 8. For example, the cell ID of the SCell to be changed to a PCell ("ServCellIndex" shown in Fig. 8) is substituted into the parameter EsPCellIndex.

[0078] As described above, when the NW ES indicator field indicates switching from an SCell to a PCell, the terminal switches the SCell indicated by the parameter EsPCellIndex to a PCell.

[0079] For example, assume that the parameter EsPCellIndex shown in Fig. 8 is set to "1" (ServCellIndex = 1). Here, the base station instructs UE #2 of CC1 shown by arrow A7a in Fig. 7 to switch from SCell to PCell by using the NW ES indicator field, for example. UE #2 that has been instructed to switch changes the RRC parameter ServCellIndex "1" corresponding to the parameter EsPCellIndex "1" to the parameter ServCellIndex "0" and switches the SCell of CC1 to PCell.

[0080] The bit width of the NW ES indicator field may be 0 or 1 bit.

[0081] For example, if the upper layer parameter is not set, the bit width of the NW ES indicator field may be 0. The upper layer parameter may be a parameter EsPCellIndex.

[0082] If the upper layer parameter is set, the bit width of the NW ES indicator field may be 1 bit.

[0083] For example, when "1" is set in the 1-bit NW ES indicator field, the terminal switches the SCell indicated by the parameter EsPCellIndex shown in Fig. 8 to the PCell. For example, when "0" is set in the 1-bit NW ES indicator field, the terminal does not switch the PCell.

[0084] <Proposal 2 - Option 1b> The target cell ID is signaled using an existing field in the DCI, for example, a 1-, 2-, 3-, 4-, or 5-bit field for specifying the SCell to be dormant, as described above in <SCell dormancy indication>.

[0085] When the target cell ID is notified using an existing field of the DCI, the RNTI distinguishes whether the existing field is used to notify the target cell ID or to notify the cell ID of the SCell to be put into sleep mode.

[0086] For example, if the DCI format is scrambled by a C-RNTI or an MCS-C-RNTI, the field is used to signal the cell ID of the SCell to be put into sleep mode. For example, if the DCI format is scrambled by an ES-RNTI, the field is used to signal the target cell ID.

[0087] <Proposal 2 - Option 2> The PCell is switched by group common DCI. In other words, the base station switches the PCell of the terminal on a group-by-group basis using the group common DCI.

[0088] The RNTI may be an RNTI for an existing group-common DCI format, or an RNTI for a new group-common DCI format may be introduced. For example, the RNTI may be an existing PS-RNTI or a newly introduced ES-RNTI. PS-RNTI is an abbreviation for Power Saving-RNTI.

[0089] The DCI format may be, for example, DCI format 2 to 6. Alternatively, the DCI format may be, for example, a new format that is introduced.

[0090] A new field may be introduced in the group common DCI for PCell switching (Proposal 2 - Option 2a) or an existing field may be used (Proposal 2 - Option 2b).

[0091] <Proposal 2 - Option 2a> If a new field is introduced into the group common DCI for PCell switching, the following Alt.1 and Alt.2 are proposed.

[0092] <Proposal 2 - Option 2a-alt.1> A target cell ID indicator field is introduced into the group-common DCI for PCell switching. The target cell ID indicator field indicates the target cell ID. The target cell ID is an ID associated with the parameter ServCellIndex or the parameter SCellIndex, and the parameter ServCellIndex or the parameter SCellIndex may be used.

[0093] The base station uses the target cell ID indicator field to switch the SCell to the PCell for multiple terminals (group terminals). The multiple terminals switch the SCell to the PCell based on the value of the target cell ID indicator field, i.e., the target cell ID.

[0094] The bit width of the target cell ID indicator field may be 0, 1, 2, 3, 4, or 5 bits.

[0095] For example, if the higher layer parameter is not set, the bit width of the target cell ID indicator field may be 0. The higher layer parameter is a parameter indicating the presence or absence of the target cell ID indicator field, and may be referred to as PcellDynamicSwitch.

[0096] If higher layer parameters are configured, the bit width of the target cell ID indicator field may be 1, 2, 3, 4, or 5 bits based on the number of SCells configured in multiple terminals. For example, if 12 SCells are configured in a terminal, the bit width of the target cell ID indicator field may be 4 bits.

[0097] <Proposal 2 - Option 2a - alt.2> An NW ES indicator field is introduced into the group-common DCI for PCell switching. The NW ES indicator field indicates switching from an SCell to a PCell. Multiple terminals instructed to switch from an SCell to a PCell by the NW ES indicator field switch the SCell indicated by the "parameter EsPCellIndex" described in FIG. 8 to the PCell.

[0098] The bit width of the NW ES indicator field may be 0 or 1 bit.

[0099] For example, if the higher layer parameter is not set, the bit width of the NW ES field may be 0. The higher layer parameter may be a parameter EsPCellIndex.

[0100] If the upper layer parameter is set, the bit width of the NW ES indicator field may be 1 bit.

[0101] For example, when the 1-bit NW ES indicator field is set to "1," the multiple terminals switch the SCell indicated by the parameter EsPCellIndex to the PCell. For example, when the 1-bit NW ES indicator field is set to "0," the multiple terminals do not perform PCell switching.

[0102] <Proposal 2 - Option 2b> The target cell ID is signaled using an existing field in the DCI, for example, a 1-, 2-, 3-, 4-, or 5-bit field for specifying the SCell to be dormant, as described above in <SCell dormancy indication>.

[0103] When the target cell ID is notified using an existing field of the DCI, the RNTI distinguishes whether the existing field is used to notify the target cell ID or to notify the cell ID of the SCell to be put into sleep mode.

[0104] For example, if the DCI format is scrambled by a C-RNTI or an MCS-C-RNTI, the field is used to signal the cell ID of the SCell to be put into sleep mode. For example, if the DCI format is scrambled by an ES-RNTI, the field is used to signal the target cell ID.

[0105] <Terminal Operation in Proposal 2> An example of the terminal operation in <Proposal 2> will be described below. A terminal to which a dynamic PCell switching instruction is given assumes that the instructed cell is the PCell.

[0106] For example, the terminal assumes that the cell with the target cell ID notified by the target cell ID indicator field described above in <Proposal 2 - Option 1a - alt.1> and <Proposal 2 - Option 2a - alt.1> is the PCell.

[0107] For example, when a PCell switching is notified by the value of the NW ES indicator field described above in <Proposal 2 - Option 1a - alt.2> and <Proposal 2 - Option 2a - alt.2>, the terminal assumes that the cell with the target cell ID set by the parameter EsPCellIndex shown in FIG. 8 is the PCell.

[0108] For example, the terminal assumes that the cell with the target cell ID notified by the existing fields described above in <Proposal 2 - Option 1b> and <Proposal 2 - Option 2b> is the PCell.

[0109] When a dynamic PCell switching is instructed, the terminal assumes that the parameter associated with the parameter ServCellIndex "0" is associated with the parameter ServCellIndex "x", where x is, for example, a target cell ID instructed by the base station. x takes a value from 1 to 31, for example.

[0110] For example, the terminal changes (overwrites) the parameter ServCellIndex that was set to "x" to "0". In other words, the terminal changes a parameter that was set to an SCell value (1 to 31) to a PCell value (0). For example, the terminal overwrites parameters related to the parameter ServCellIndex, such as the parameter servCellIndex of SpCellConfig shown in FIG. 9A and the parameter schedulingCellId of CrossCarrierSchedulingConfig shown in FIG. 9B, to 0 (setting ServCellIndex = 0). With this operation, the terminal switches the SCell to the PCell.

[0111] Furthermore, the terminal changes (overwrites) the parameter ServCellIndex, which was previously "0", to "x". In other words, the terminal changes the parameter set to the PCell value (0) to the SCell value (1 to 31). With this operation, the terminal switches the PCell to the Scell. Furthermore, the terminal shares the same parameters as the base station.

[0112] <Summary of Proposal 2> As described above, the base station controls PCell switching using lower layer parameters such as DCI.

[0113] This operation reduces the signaling overhead based on RRC reconfiguration in PCell switching control at the base station, thereby suppressing switching-related delays. Furthermore, the processing load at the base station is reduced, enabling ES to be achieved.

[0114] Furthermore, when an existing field of DCI is used for PCell switching control, design changes in the base station and terminal can be suppressed.

[0115] <Proposal 3> The deactivation of the Scell ​​described in <Proposal 1> above may be performed by the RRC and / or MAC CE as described in <Proposal 1>.

[0116] However, when SCell deactivation is performed by RRC and / or MAC CE, signaling overhead based on RRC and / or MAC CE occurs. Also, the processing time for SCell deactivation is long, and it takes a long time to complete SCell deactivation.

[0117] Therefore, dynamic cell deactivation is proposed for SCell deactivation in Proposal 3. Note that the operation of Proposal 3 can also be applied to PCell deactivation.

[0118] One or both of the SCell and PCell (hereinafter referred to as SCell / PCell) are deactivated by a lower layer parameter such as DCI. For example, a base station deactivates the SCell / PCell of a terminal using DCI. The terminal deactivates the SCell / PCell based on the DCI from the base station.

[0119] In <Proposal 3>, the following options 1 and 2 are proposed.

[0120] <Proposal 3 - Option 1> The SCell / PCell is deactivated by UE-specific DCI. In other words, the base station deactivates the SCell / PCell of each UE by using UE-specific DCI.

[0121] The RNTI may be an RNTI for a terminal-specific DCI format such as a C-RNTI or an MCS-C-RNTI, or a new terminal-specific RNTI such as an ES-RNTI may be introduced.

[0122] The DCI format may be, for example, DCI format 0_1 / 0_2 / 1_1 / 1_2, or a new DCI format may be introduced.

[0123] A new field may be introduced in the DCI for SCell / PCell deactivation (Proposal 3 - Option 1a) or an existing field may be used (Proposal 3 - Option 1b).

[0124] <Proposal 3 - Option 1a> If a new field is introduced into DCI for SCell / PCell deactivation, the following Alt.1 and Alt.2 are proposed.

[0125] <Proposal 3 - Option 1a - alt.1> A target cell ID indicator field is introduced into DCI for deactivation of an SCell / PCell. The target cell ID indicator field indicates the cell ID of the SCell / PCell to be deactivated. The cell ID of the SCell / PCell to be deactivated is an ID associated with the parameter ServCellIndex or the parameter SCellIndex, and may be the parameter ServCellIndex or the parameter SCellIndex. Hereinafter, the cell ID of the SCell / PCell to be deactivated may be referred to as the target cell ID.

[0126] The base station notifies the terminal of the target cell ID using the target cell ID indicator field, and the terminal deactivates the SCell / PCell based on the value of the target cell ID indicator field, i.e., the target cell ID.

[0127] For example, the base station notifies each of UE #1 and UE #2 of CC2 (CC2 is an SCell in UE #1 and UE #2) indicated by arrow A7c in Fig. 7 of a target cell ID "1" using a target cell ID indicator field. UE #1 and UE #2 notified of the target cell ID "1" deactivate the SCell with the RRC parameter ServCellIndex "1" corresponding to the target cell ID "1". In this way, the base station deactivates the SCell / PCell using DCI.

[0128] The bit width of the target cell ID indicator field may be 0, 1, 2, 3, 4, or 5 bits.

[0129] For example, if the higher layer parameter is not set, the bit width of the target cell ID indicator field may be 0. The higher layer parameter is a parameter indicating the presence or absence of the target cell ID indicator field, and may be referred to as ScellDynamicDeactivation.

[0130] If higher layer parameters are configured, the bit width of the target cell ID indicator field may be 1, 2, 3, 4, or 5 bits depending on the number of SCells configured in the terminal. For example, if 12 SCells are configured in the terminal, the bit width of the target cell ID indicator field may be 4 bits.

[0131] <Proposal 3 - Option 1a - alt.2> An SCell deactivation indicator field is introduced into the DCI for SCell deactivation. The SCell deactivation indicator field indicates the deactivation of all SCells. A terminal for which the deactivation of all SCells is instructed by the SCell deactivation indicator field deactivates all SCells in the terminal.

[0132] The bit width of the SCell deactivation indicator field may be 0 or 1 bit.

[0133] For example, if a higher layer parameter is not set, the bit width of the SCell deactivation indicator field may be 0. The higher layer parameter is a parameter indicating the presence or absence of the SCell deactivation indicator field, and may be referred to as ScellDynamicDeactivation.

[0134] If the higher layer parameters are configured, the bit width of the SCell deactivation indicator field may be 1 bit.

[0135] For example, if a 1-bit SCell deactivation indicator field is set to "1", the UE deactivates all SCells configured in the UE. For example, if a 1-bit SCell deactivation indicator field is set to "0", the UE activates SCells.

[0136] <Proposal 3 - Option 1b> The target cell ID is signaled using an existing field in the DCI. For example, the target cell ID to be deactivated is signaled using a 1-, 2-, 3-, 4-, or 5-bit field for specifying the SCell to be dormant, as described above in <SCell dormancy indication>.

[0137] When the target cell ID is notified using an existing field of the DCI, the RNTI distinguishes whether the existing field is used to notify the target cell ID or to notify the cell ID of the SCell to be put into sleep mode.

[0138] For example, if the DCI format is scrambled by the C-RNTI or the MCS-C-RNTI, the field is used to signal the cell ID of the SCell to be put into sleep mode, and if the DCI format is scrambled by the ES-RNTI, the field is used to signal the target cell ID.

[0139] <Proposal 3 - Option 2> SCell / PCell is deactivated by group-common DCI. In other words, the base station deactivates SCell / PCell of terminals on a group-by-group basis using group-common DCI.

[0140] The RNTI may be an RNTI for an existing group-common DCI format, or an RNTI for a new group-common DCI format may be introduced. For example, the RNTI may be an existing PS-RNTI or a newly introduced ES-RNTI.

[0141] The DCI format may be, for example, DCI format 2 to 6. Alternatively, the DCI format may be, for example, a new format that is introduced.

[0142] A new field may be introduced for the group common DCI for SCell / PCell deactivation (Proposal 3 - Option 2a) or an existing field may be used (Proposal 3 - Option 2b).

[0143] <Proposal 3 - Option 2a> If a new field is introduced into the group common DCI for SCell / PCell deactivation, the following Alt.1 and Alt.2 are proposed.

[0144] <Proposal 3 - Option 2a-alt.1> A target cell ID indicator field is introduced into the group-wide DCI for SCell / PCell deactivation. The target cell ID indicator field indicates the target cell ID. The target cell ID is an ID associated with the parameter ServCellIndex or the parameter SCellIndex, and the parameter ServCellIndex or the parameter SCellIndex may be used.

[0145] The base station deactivates the SCell / PCell for multiple terminals (group terminals) using the target cell ID indicator field. The multiple terminals deactivate the SCell / PCell based on the value of the target cell ID indicator field, i.e., the target cell ID.

[0146] The bit width of the target cell ID indicator field may be 0, 1, 2, 3, 4, or 5 bits.

[0147] For example, if the higher layer parameter is not set, the bit width of the target cell ID indicator field may be 0. The higher layer parameter is a parameter indicating the presence or absence of the target cell ID indicator field, and may be referred to as ScellDynamicDeactivation.

[0148] If higher layer parameters are configured, the bit width of the target cell ID indicator field may be 1, 2, 3, 4, or 5 bits based on the number of SCells configured in multiple terminals. For example, if 12 SCells are configured in a terminal, the bit width of the target cell ID indicator field may be 4 bits.

[0149] <Proposal 3 - Option 2a - alt.2> An SCell deactivation indicator field is introduced into the group common DCI for SCell deactivation. The SCell deactivation indicator field indicates the deactivation of all SCells. Multiple terminals that are instructed to deactivate all SCells by the SCell deactivation indicator field deactivate all SCells.

[0150] The bit width of the SCell deactivation indicator field may be 0 or 1 bit.

[0151] For example, if a higher layer parameter is not set, the bit width of the SCell deactivation indicator field may be 0. The higher layer parameter is a parameter indicating the presence or absence of the SCell deactivation indicator field, and may be referred to as ScellDynamicDeactivation.

[0152] If the higher layer parameters are configured, the bit width of the SCell deactivation indicator field may be 1 bit.

[0153] For example, when a 1-bit SCell deactivation indicator field is set to "1," multiple terminals deactivate all SCells. For example, when a 1-bit SCell deactivation indicator field is set to "0," multiple terminals activate SCells.

[0154] <Proposal 3 - Option 2b> The target cell ID is signaled using an existing field in the DCI. For example, the target cell ID to be deactivated is signaled using a 1-, 2-, 3-, 4-, or 5-bit field for specifying the SCell to be dormant, as described above in <SCell dormancy indication>.

[0155] When the target cell ID is notified using an existing field of the DCI, the RNTI distinguishes whether the existing field is used to notify the target cell ID or to notify the cell ID of the SCell to be put into sleep mode.

[0156] For example, if the DCI format is scrambled by the C-RNTI or the MCS-C-RNTI, the field is used to signal the cell ID of the SCell to be put into sleep mode, and if the DCI format is scrambled by the ES-RNTI, the field is used to signal the target cell ID.

[0157] <Terminal Operation in Proposal 3> An example of terminal operation in <Proposal 3> will be described below. The terminal deactivates and activates the SCell / PCell based on values ​​instructed by the base station.

[0158] For example, the terminal deactivates and deactivates the SCell / PCell of the target cell ID indicated by the target cell ID indicator field described above in <Proposal 3 - Option 1a - alt.1> and <Proposal 3 - Option 2a - alt.1>.

[0159] For example, the terminal deactivates and deactivates all of the SCells depending on the value of the SCell deactivation indicator field described above in <Proposal 3 - Option 1a - alt.2> and <Proposal 3 - Option 2a - alt.2>.

[0160] For example, the terminal deactivates and deactivates the SCell / PCell of the target cell ID notified by the existing fields described above in <Proposal 3 - Option 1b> and <Proposal 3 - Option 2b>.

[0161] <Summary of Proposal 3> As described above, the base station controls the deactivation of SCell / PCell using lower layer parameters such as DCI.

[0162] This operation reduces the signaling overhead based on RRC reconfiguration in SCell / PCell deactivation control at the base station, and suppresses delays associated with switching. Furthermore, the processing load at the base station is reduced, enabling ES to be achieved.

[0163] Furthermore, when an existing field of DCI is used for SCell / PCell deactivation control, design changes in the base station and terminal can be suppressed.

[0164] <Proposal 4> Proposal 4 describes the joint operation of the dynamic PCell switching of Proposal 2 and the dynamic cell deactivation of Proposal 3.

[0165] The base station performs an operation that combines the dynamic PCell switching of proposal 2 and the dynamic cell deactivation of proposal 3. The base station may have an operation based on the dynamic PCell switching indication of proposal 2 (proposal 4 - option 1) or an operation based on the dynamic cell deactivation indication of proposal 3 (proposal 4 - option 2).

[0166] <Proposal 4 - Option 1> In the joint operation of dynamic PCell switching and dynamic cell deactivation, the ID of the target cell to be deactivated is implicitly indicated by the dynamic PCell switching indication. For example, when a terminal receives a dynamic PCell switching indication, the terminal deactivates and / or releases (activates) cells other than the target cell ID indicated in the dynamic PCell switching indication.

[0167] <Proposal 4 - Option 1 - Example 1> For example, if a terminal is notified of target cell ID "x" (x is a positive integer) in the target cell ID indicator field, the terminal deactivates cells with cell IDs other than "x".

[0168] After deactivation, the terminal assumes (overwrites) the parameters associated with the parameter ServCellIndex "0" to be associated with the parameter ServCellIndex "x".

[0169] Also, for example, when the terminal receives a PCell switching instruction in the NW ES indicator field, the terminal deactivates cells having cell IDs other than those of the parameter EsPCellIndex "x."

[0170] After deactivation, the terminal assumes (overwrites) the parameters associated with the parameter ServCellIndex "0" to be associated with the parameter EsPCellIndex "x".

[0171] <Proposal 4 - Option 1 - Example 2> For example, if a target cell ID "x" is notified in the target cell ID indicator field, the terminal assumes (overwrites) that the parameter associated with the parameter ServCellIndex "0" is associated with the parameter ServCellIndex "x".

[0172] After overwriting (rewriting) the parameters, the terminal deactivates the cell with parameter ServCellIndex "x".

[0173] Furthermore, for example, when the terminal receives a PCell switching instruction in the NW ES indicator field, the terminal assumes (overwrites) that the parameter associated with the parameter ServCellIndex "0" is associated with the parameter EsPCellIndex "x".

[0174] After overwriting (rewriting) the parameters, the terminal deactivates the cell with parameter EsPCellIndex "x".

[0175] <Proposal 4 - Option 2> In the joint operation of dynamic PCell switching and dynamic cell deactivation, the target cell ID to be the PCell is implicitly indicated by the dynamic cell deactivation instruction. For example, when the UE receives a dynamic cell deactivation instruction, it assumes that one of the remaining activated cells is the PCell. For example, the UE assumes that one of the cells that was not deactivated by the dynamic cell deactivation instruction is the PCell.

[0176] For example, assume that a PCell with cell ID "0" and SCells with cell IDs "1", "2", and "3" are configured in a terminal. When target cell IDs "0", "1", and "2", for example, are instructed in a dynamic cell deactivation command, the terminal assumes that the remaining cell ID "3" is the PCell.

[0177] The terminal may, for example, select an activated cell with the smallest cell ID (parameter ServCellIndex) among the remaining activated cells as the PCell. Alternatively, the terminal may, for example, select an activated cell with the largest cell ID among the remaining activated cells as the PCell.

[0178] <Summary of Proposal 4> As described above, in the joint operation of dynamic PCell switching and dynamic cell deactivation, the ID of the target cell to be deactivated is implicitly indicated by the dynamic PCell switching indication.

[0179] This operation allows the base station to reduce signaling overhead in PCell switching control and SCell / PCell deactivation control, and suppress delays related to PCell switching control and SCell / PCell deactivation control. Furthermore, the base station reduces processing load and can achieve ES.

[0180] Furthermore, in the joint operation of dynamic PCell switching and dynamic cell deactivation, the target cell ID to be the PCell is implicitly indicated by the dynamic cell deactivation instruction.

[0181] This operation reduces signaling overhead and communication delays in the base station during PCell switching control and SCell / PCell deactivation control. Furthermore, the base station reduces its processing load and achieves ES.

[0182] <Variations> Variation 1 A PCell deactivation indicator field may be introduced into the DCI for PCell deactivation.

[0183] For example, the UE deactivates the PCell if the PCell deactivation indicator field is set to "1." For example, the UE does not deactivate the PCell if the PCell deactivation indicator field is set to "0."

[0184] Also, a PCell deactivation indicator field may be introduced into the group common DCI for PCell deactivation.

[0185] For example, multiple terminals deactivate the PCell if the PCell deactivation indicator field is set to "1." For example, a terminal does not deactivate the PCell if the PCell deactivation indicator field is set to "0."

[0186] When deactivating a PCell, the terminal assumes that any activated cell is the PCell. For example, the activated cell with the smallest cell ID (parameter ServCellIndex) among the remaining activated cells may be the PCell. Furthermore, the terminal may assume that the activated cell with the largest cell ID among the remaining activated cells is the PCell.

[0187] Variation 2: The dynamic PCell switching described above may be applied to PSCell switching. Dynamic cell deactivation may be applied to PSCell deactivation.

[0188] Variation 3: Proposals 2, 3, and 4 are not limited to ES operations of a base station. For example, Proposals 2, 3, and 4 can be applied to operations other than those described in Proposal 1. For example, Proposals 2, 3, and 4 may be used for switching and / or deactivating a cell based on deterioration of communication quality.

[0189] Variation 4: Whether each of the above options and Alt. are supported may depend on the configuration by RRC, the instruction by MAC CE or DCI, or the terminal capability. There may be one or more supported options and Alt.

[0190] <Terminal Capabilities> A terminal may report the following terminal capabilities to a base station as UE capabilities: - Whether dynamic PCell switching is supported - Whether dynamic cell deactivation is supported

[0191] <Configuration of Base Station> Fig. 10 is a block diagram showing an example of the configuration of a base station 10 according to an embodiment. The base station 10 includes, for example, a transmitting unit 101, a receiving unit 102, and a control unit 103. The base station 10 communicates with a terminal 20 (see Fig. 11) wirelessly.

[0192] The transmitter 101 transmits a downlink (DL) signal to the terminal 20. For example, the transmitter 101 transmits the DL signal under the control of the controller 103.

[0193] The DL signal may include, for example, a downlink data signal and control information (e.g., Downlink Control Information (DCI)). The DL signal may also include information indicating scheduling related to signal transmission of the terminal 20 (e.g., an UL grant). The DL signal may also include control information of higher layers (e.g., control information of Radio Resource Control (RRC)). The DL signal may also include a reference signal.

[0194] The channels used for transmitting DL signals include, for example, a data channel and a control channel. For example, the data channel may include a PDSCH (Physical Downlink Shared Channel), and the control channel may include a PDCCH (Physical Downlink Control Channel). For example, the base station 10 transmits control information to the terminal 20 using the PDCCH and transmits downlink data signals using the PDSCH.

[0195] The reference signal included in the DL signal may include at least one of a demodulation reference signal (Demodulation Reference Signal (DMRS)), a Phase Tracking Reference Signal (PTRS), a Channel State Information-Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), and a Positioning Reference Signal (PRS) for position information. For example, reference signals such as DMRS and PTRS are used for demodulating downlink data signals and are transmitted using the PDSCH.

[0196] The receiving unit 102 receives an uplink (UL) signal transmitted from the terminal 20. For example, the receiving unit 102 receives the UL signal under the control of the control unit 103.

[0197] The control unit 103 controls the communication operations of the base station 10 , including the transmission processing of the transmission unit 101 and the reception processing of the reception unit 102 .

[0198] For example, the control unit 103 acquires information such as data and control information from the upper layer and outputs it to the transmitting unit 101. The control unit 103 also outputs the data, control information, etc. received from the receiving unit 102 to the upper layer.

[0199] For example, the control unit 103 allocates resources (or channels) used for transmitting and receiving DL signals and / or resources used for transmitting and receiving UL signals based on signals (e.g., data and control information, etc.) received from the terminal 20 and / or data and control information, etc. acquired from a higher layer. Information on the allocated resources may be included in control information transmitted to the terminal 20.

[0200] The control unit 103 sets PUCCH resources as an example of allocation of resources used for transmitting and receiving UL signals. Information related to PUCCH configuration such as a PUCCH cell timing pattern (PUCCH configuration information) may be notified to the terminal 20 by RRC.

[0201] The control unit 103 determines a second cell to be switched to the first cell. The transmission unit 101 transmits information about the second cell using a downlink control signal (associated with) the ES of the base station. Here, the downlink control signal is, for example, DCI. The first cell is, for example, a cell that ensures connectivity between the base station 10 and the terminal 20 in carrier aggregation (CA). Alternatively, the first cell is, for example, a CC that ensures connectivity among multiple carriers used in CA. The first cell is, for example, a PCell. Furthermore, the second cell is, for example, a cell that provides radio resources in addition to the PCell in CA. Alternatively, the second cell is, for example, a CC that is not a PCell or a PSCell among multiple carriers used in CA. The second cell is, for example, an SCell. With this operation, the base station 10 dynamically switches from the second cell to the first cell without going through a higher layer, thereby suppressing communication delays. Furthermore, the processing load on the base station 10 is suppressed.

[0202] The control unit 103 includes a cell index of the second cell to be switched to the first cell in the downlink control signal for the ES. This operation allows the base station 10 to dynamically switch from the second cell to the first cell without going through a higher layer, thereby reducing communication delays. Furthermore, the processing load on the base station 10 is reduced.

[0203] Furthermore, the control unit 103 determines the second cell to be deactivated. The transmission unit 101 transmits information about the second cell determined by the control unit 103 using a downlink control signal related to the ES of the base station 10. With this operation, the base station 10 dynamically deactivates the second cell without going through a higher layer, thereby suppressing communication delays. Furthermore, the processing load on the base station 10 is suppressed.

[0204] The control unit 103 includes the cell index of the second cell to be deactivated in the downlink control signal. This operation allows the base station 10 to dynamically deactivate the second cell without going through a higher layer, thereby reducing communication delays. Furthermore, the processing load on the base station 10 is reduced.

[0205] 11 is a block diagram showing an example of the configuration of the terminal 20 according to the embodiment. The terminal 20 includes, for example, a receiving unit 201, a transmitting unit 202, and a control unit 203. The terminal 20 communicates with the base station 10 wirelessly, for example.

[0206] The receiving unit 201 receives a DL signal transmitted from the base station 10. For example, the receiving unit 201 receives the DL signal under the control of the control unit 203.

[0207] The transmitting unit 202 transmits the UL signal to the base station 10. For example, the transmitting unit 202 transmits the UL signal under the control of the control unit 203.

[0208] The UL signal may include, for example, an uplink data signal and control information (e.g., UCI). For example, information related to the processing capability of the terminal 20 (e.g., UE capability) may be included. The UL signal may also include a reference signal.

[0209] Channels used for transmitting UL signals include, for example, data channels and control channels. For example, the data channels include a PUSCH (Physical Uplink Shared Channel), and the control channels include a PUCCH (Physical Uplink Control Channel). For example, the terminal 20 receives control information from the base station 10 using the PUCCH and transmits uplink data signals using the PUSCH.

[0210] The reference signals included in the UL signal may include, for example, at least one of DMRS, PTRS, CSI-RS, SRS, and PRS. For example, the reference signals such as DMRS and PTRS are used for demodulating the uplink data signal and are transmitted using an uplink channel (for example, PUSCH).

[0211] The control unit 203 controls the communication operations of the terminal 20 , including the reception processing in the receiving unit 201 and the transmission processing in the transmitting unit 202 .

[0212] For example, the control unit 203 acquires information such as data and control information from the upper layer and outputs it to the transmitting unit 202. Also, the control unit 203 outputs, for example, the data and control information received from the receiving unit 201 to the upper layer.

[0213] For example, the control unit 203 controls transmission of information to be fed back to the base station 10. The information to be fed back to the base station 10 may include, for example, HARQ-ACK, channel state information (CSI), or a scheduling request (SR). The information to be fed back to the base station 10 may be included in UCI. The UCI is transmitted in the resources of the PUCCH.

[0214] The control unit 203 sets PUCCH resources based on configuration information (for example, configuration information such as a PUCCH cell timing pattern notified by RRC and / or DCI) received from the base station 10. The control unit 203 determines the PUCCH resources to be used for transmitting information to be fed back to the base station 10. Under the control of the control unit 203, the transmission unit 202 transmits the information to be fed back to the base station 10 in the PUCCH resources determined by the control unit 203.

[0215] Note that the channel used for transmitting the DL signal and the channel used for transmitting the UL signal are not limited to the above-mentioned examples. For example, the channel used for transmitting the DL signal and the channel used for transmitting the UL signal may include a Random Access Channel (RACH) and a Physical Broadcast Channel (PBCH). The RACH may be used to transmit Downlink Control Information (DCI) including a Random Access Radio Network Temporary Identifier (RA-RNTI), for example.

[0216] The receiver 201 receives a downlink control signal related to the ES of the base station 10. The controller 203 switches the second cell to the first cell based on the downlink control signal related to the ES received by the receiver 201. This operation enables the terminal 20 to dynamically switch from the second cell to the first cell without going through a higher layer, thereby suppressing communication delays. Furthermore, the processing load on the terminal 20 is suppressed.

[0217] The control unit 203 switches the second cell to the first cell based on the cell index of the second cell to be switched to the first cell, which is included in the downlink control signal. This operation allows the terminal 20 to dynamically switch from the second cell to the first cell without going through a higher layer, thereby reducing communication delays. Furthermore, the processing load on the terminal 20 is reduced.

[0218] Furthermore, the receiver 201 receives a downlink control signal related to the ES of the base station 10. The controller 203 deactivates the second cell based on the downlink control signal related to the ES of the base station 10 received by the receiver 201. With this operation, the terminal 20 dynamically deactivates the second cell without going through a higher layer, thereby suppressing communication delays. Furthermore, the processing load on the terminal 20 is suppressed.

[0219] The control unit 203 deactivates the second cell based on the cell index of the second cell included in the downlink control signal. This operation allows the terminal 20 to dynamically deactivate the second cell without going through an upper layer, thereby reducing communication delays. Furthermore, the processing load on the terminal 20 is reduced.

[0220] Furthermore, the receiving unit 201 receives a downlink control signal related to the ES of the base station 10. When the receiving unit 201 receives a downlink control signal instructing switching from the second cell to the first cell, the control unit 203 deactivates the second cells other than the second cell instructed to switch. This operation enables the terminal 20 to dynamically switch from the second cell to the first cell and deactivate the second cell without going through a higher layer, thereby suppressing communication delays. Furthermore, the processing load on the terminal 20 is suppressed.

[0221] The control unit 203 deactivates the second cell having a cell index other than the cell index notified by the downlink control signal. This operation enables the terminal 20 to dynamically switch the second cell to the first cell and deactivate the second cell without going through a higher layer, thereby reducing communication delays. Furthermore, the processing load on the terminal 20 is reduced.

[0222] Furthermore, the receiving unit 201 receives a downlink control signal related to the ES of the base station 10. When the receiving unit 201 receives a downlink control signal instructing the deactivation of the second cell, the control unit 203 determines a second cell to be switched to the first cell from among secondary cells other than the second cell to be deactivated. This operation enables the terminal 20 to dynamically switch the second cell to the first cell and deactivate the second cell without going through a higher layer, thereby suppressing communication delays. Furthermore, the processing load on the terminal 20 is suppressed.

[0223] The control unit 203 switches the second cell with the smallest cell index or the largest cell index among the second cells other than the second cell to be deactivated to the primary cell. This operation enables the terminal 20 to dynamically switch the second cell to the first cell and deactivate the second cell without going through a higher layer, thereby suppressing communication delays. Furthermore, the processing load on the terminal 20 is suppressed.

[0224] The present disclosure has been described above. Note that the division of items in the above description is not essential to the present disclosure, and items described in two or more items may be used in combination as needed, and items described in one item may be applied to items described in another item (unless they are inconsistent).

[0225] <Hardware Configuration, etc.> The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (e.g., using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining software with the single device or the multiple devices.

[0226] Functions include, but are not limited to, judgment, determination, assessment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0227] For example, a base station, a terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 12 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to this embodiment. The base station 10 and the terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0228] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0229] Each function in the base station 10 and the terminal 20 is realized by loading specified software (programs) onto hardware such as the processor 1001 and the memory 1002, causing the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0230] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 103 and control unit 203 may be realized by the processor 1001.

[0231] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 203 of the terminal 20 may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and similar implementations may be made for other functional blocks. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may also be transmitted from a network via a telecommunications line.

[0232] The memory 1002 is a computer-readable recording medium and may be configured by, for example, at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0233] Storage 1003 is a computer-readable recording medium, and may be composed of at least one of, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned storage medium may be, for example, a database, a server, or other appropriate medium including at least one of memory 1002 and storage 1003.

[0234] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitter 101, receiver 102, receiver 201, transmitter 202, etc. may be realized by the communication device 1004.

[0235] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0236] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0237] Furthermore, the base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0238] <Notification of Information, Signaling> Notification of information is not limited to the embodiments described in the present disclosure and may be performed using other methods. For example, notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or a combination thereof. Furthermore, RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0239] <Applicable Systems> The embodiments described in the present disclosure are applicable to LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), FRA (Future Radio Access), NR (new Radio), New radio access (NX), Future generation radio access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802.34 (WiMAX (registered trademark The present invention may be applied to at least one of systems using 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), or other suitable systems, and next-generation systems that are extended, modified, created, or defined based on these systems. The present invention may also be applied to a combination of multiple systems (e.g., a combination of LTE and / or LTE-A with 5G).

[0240] <Processing Procedures, etc.> The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be rearranged unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0241] <Operation of Base Station> In the present disclosure, specific operations described as being performed by a base station may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and another network node other than the base station (for example, an MME or an S-GW, etc., but are not limited to these). Although the above example illustrates a case where there is one other network node other than the base station, a combination of multiple other network nodes (for example, an MME and an S-GW) may also be used.

[0242] <Direction of Input / Output> Information, etc. (see <Information, Signal>) can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may also be input / output via multiple network nodes.

[0243] <Handling of Input / Output Information, etc.> Input / output information, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information, etc. may be overwritten, updated, or added. Output information, etc. may be deleted. Input information, etc. may be sent to another device.

[0244] <Determination method> The determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0245] <Variations of Aspects, etc.> Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched depending on the implementation. In addition, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0246] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

[0247] <Software> Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0248] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0249] Information, Signals, etc., described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be referred to throughout the above description, may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0250] Note that terms described in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0251] <System, Network> As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0252] <Parameter and Channel Names> Furthermore, the information, parameters, and the like described in the present disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or other corresponding information. For example, a radio resource may be indicated by an index.

[0253] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0254] <Base Station> In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. A base station may also be referred to by terms such as a macrocell, a small cell, a femtocell, and a picocell.

[0255] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a remote radio head (RRH)). The terms "cell" or "sector" refer to part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage area.

[0256] Mobile Station In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," and the like may be used interchangeably.

[0257] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0258] <Base Station / Mobile Station> At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, etc. The mobile object refers to a movable object, and may move at any speed. Naturally, this also includes cases where the mobile object is stationary. Examples of the mobile object include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and objects mounted thereon. The mobile object may also be an autonomous mobile object operating based on an operational command. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0259] Furthermore, a base station in the present disclosure may be read as a terminal. For example, the embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a terminal is replaced with communication between multiple terminals (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0260] Similarly, the term "terminal" in the present disclosure may be read as "base station." In this case, the base station 10 may be configured to have the functions of the terminal 20 described above.

[0261] Fig. 13 shows an example configuration of a vehicle 2001. As shown in Fig. 13, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example.

[0262] The drive unit 2002 is configured, for example, by an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0263] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2029 provided in the vehicle 2001. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0264] The signals from the various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the current of the motor, a rotation speed signal of the front and rear wheels obtained by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0265] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing (outputting) various types of information, such as driving information, traffic information, and entertainment information, and one or more ECUs that control these devices. The information service unit 2012 provides various types of multimedia information and multimedia services to the occupants of the vehicle 2001 by using information acquired from external devices via the communication module 2013, etc.

[0266] The information service unit 12 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0267] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driving burden on the driver, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS, etc.), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. In addition, the driving assistance system unit 2030 transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0268] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 29, which are provided in the vehicle 2001.

[0269] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

[0270] The communication module 2013 may transmit at least one of signals from the above-mentioned various sensors 2021 to 2029 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 2029, the information service unit 2012, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above-mentioned input.

[0271] The communication module 2013 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on the information service unit 2012 provided in the vehicle 2001. The information service unit 2012 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 2013 (or data / information decoded from the PDSCH)).

[0272] Furthermore, the communication module 2013 stores various information received from external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, sensors 2021 to 2029, and the like provided in the vehicle 2001.

[0273] <Meaning and Interpretation of Terms> As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching a table, database, or other data structure), ascertaining something that is considered to be a "judging" or "determining," and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like that are considered to be a "judging" or "determining." Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0274] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0275] <Reference Signal> A reference signal can also be abbreviated as RS (Reference Signal), and may also be called a pilot depending on the applicable standard.

[0276] <Meaning of "based on"> As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0277] "First," "Second" Any reference to an element using designations such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0278] <Means> The "means" in the configuration of each device above may be replaced with "section," "circuit," "device," etc.

[0279] Open Format: When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0280] <Time Units such as TTI, Frequency Units such as RB, and Radio Frame Configuration> A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0281] Numerology may be a communication parameter that applies to the transmission and / or reception of a signal or channel, and may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0282] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol). A slot may be a time unit based on numerology.

[0283] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0284] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0285] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0286] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0287] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0288] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0289] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0290] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0291] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0292] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0293] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0294] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0295] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0296] 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.

[0297] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0298] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples, and various changes may be made to the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc.

[0299] <Maximum Transmit Power> The "maximum transmit power" in the present disclosure may refer to the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0300] Articles In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0301] <"Different"> In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." Note that the term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0302] One aspect of the present disclosure is useful in wireless communication systems.

[0303] 10 Base station 20 Terminal 101, 202 Transmitter 102, 201 Receiver 103, 203 Control unit

Claims

1. a receiving unit for receiving downlink control information regarding a power saving instruction for a primary cell of one or more terminals; a control unit that applies the primary cell to another cell based on the downlink control information; A terminal having:

2. the downlink control information includes a bit field for indicating the power saving when an upper layer parameter related to the power saving is configured; The control unit applies the primary cell to another cell based on a bit in the bit field. The terminal of claim 1.

3. the downlink control information does not have a bit field for indicating the power saving when an upper layer parameter related to the power saving is not configured; The control unit does not apply the primary cell to another cell based on the downlink control information. The terminal of claim 1.

4. The receiver receives an identifier of a candidate cell; The control unit selects the other cell to which the primary cell is to be applied from among the identifiers of the candidate cells. The terminal according to claim 1 .

5. The receiving unit receives the downlink control information scrambled by a Radio Network Temporary Identifier (RNTI) for power saving. The terminal of claim 1.

6. a control unit that determines a power saving instruction for a primary cell of one or more terminals; a transmitter that transmits downlink control information regarding the instruction to power save based on the determination; A base station having

7. a control unit that determines a power saving instruction for a primary cell of one or more terminals; a transmitter that transmits downlink control information regarding the instruction to power save based on the determination; a base station having a receiving unit that receives the downlink control information; a control unit that applies the primary cell to another cell based on the downlink control information; a terminal having A wireless system having:

8. The device is receiving downlink control information regarding a power saving instruction for a primary cell of one or more terminals; Applying the primary cell to another cell based on the downlink control information; Communication method.