Terminal, base station, and communication method

Abstract

A terminal comprising: a transmission unit for reporting, to a base station, capability information indicating a switching time pertaining to switching between bands in a transmission-switching scheme in which at least one antenna port among a plurality of antenna ports is capable of switching between bands spanning two or more bands and in which the bands used in transmission are switched between spanning a total of three or more bands of the plurality of antenna ports; and a reception unit for receiving, from the base station, information relating to a cell in which the switching time occurs.

Description

[Technical Field]

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

[0002] For NR (New Radio) (also known as "5G"), the successor system to LTE (Long Term Evolution), technologies that satisfy 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).

[0003] Furthermore, studies have begun on 6G as the next-generation wireless communication system after 5G, and it is expected to achieve wireless quality that exceeds that of 5G. For example, studies are underway for 6G to achieve even higher capacity, the use of new frequency bands, even lower latency, even higher reliability, even lower power consumption, and the expansion of coverage to new areas (high altitude, sea, and space) using non-terrestrial networks. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 38.300 V16.8.0 (2021-12) Summary of the Invention [Problem to be solved by the invention]

[0005] Studies are being conducted to enhance uplink transmission in multicarrier systems. For example, a mobile terminal that supports up to two simultaneous transmissions can dynamically switch between three or four bands for uplink transmission. However, there is no existing technology related to the capability information and configuration information required to achieve this operation. Therefore, there is a possibility that the uplink transmission band cannot be switched appropriately.

[0006] The present invention has been made in view of the above points, and an object of the present invention is to provide a technique that enables appropriate switching of the band used for uplink transmission in a wireless communication system. [Means for solving the problem]

[0007] According to the disclosed technology, at least one antenna port of the plurality of antenna ports is N or more (N>1, N is an integer) Band switching is possible across multiple antenna ports. M or more (M>N, M is an integer) a transmitting unit that reports capability information indicating a switching time required for switching between bands to a base station in a transmission switching method that switches a band used for transmission across a band; a receiving unit that receives information about a cell in which the switching time occurs from the base station; Equipped with The transmitter transmits a value indicating a switching time required for switching between the bands for each band combination among a plurality of band combinations supported for the transmission switching scheme. A terminal is provided. [Effects of the Invention]

[0008] The disclosed technology provides a technology that enables appropriate switching of the band used for uplink transmission in a wireless communication system. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Figure 2] 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Figure 3] FIG. 1 illustrates Case 1 and Case 2 in UL Tx switching. [Figure 4] 10A to 10C are diagrams illustrating examples of the configuration of antenna ports used for transmission in each case of UL Tx switching. [Figure 5]1A to 1C are diagrams illustrating examples of the configuration of antenna ports used for transmission and reception in each case of UL Tx switching. [Figure 6] FIG. 10 is a diagram illustrating an example of UE capability. [Figure 7] FIG. 10 is a diagram illustrating an example of an RRC configuration. [Figure 8] FIG. 10 is a diagram illustrating an example of a switching period. [Figure 9] FIG. 10 is a diagram illustrating an example of a switching period. [Figure 10] FIG. 10 is a diagram showing an example of the length of a Dl interruption. [Figure 11] FIG. 10 is a diagram illustrating Cases 1 to 3 in UL Tx switching. [Figure 12] 10A to 10C are diagrams illustrating examples of the configuration of antenna ports used for transmission in each case of UL Tx switching. [Figure 13] FIG. 10 is a diagram illustrating an example of an RRC configuration. [Figure 14] FIG. 10 is a diagram illustrating an example of UL Tx switching in which one band contains multiple carriers. [Figure 15] 10A to 10C are diagrams illustrating examples of the configuration of antenna ports used for transmission in each case of UL Tx switching. [Figure 16] 10A to 10C are diagrams illustrating examples of the configuration of antenna ports used for transmission in each case of UL Tx switching. [Figure 17] FIG. 10 is a diagram illustrating a configuration example in which switching is performed across four bands. [Figure 18] FIG. 10 is a diagram illustrating an example of the configuration of antenna ports used for transmission when switching is performed across four bands. [Figure 19] FIG. 1 is a diagram illustrating an example of a basic operation of an embodiment. [Figure 20] FIG. 2 is a diagram illustrating an example of the configuration of a base station 10. [Figure 21] FIG. 2 is a diagram illustrating an example of the configuration of a terminal 20. [Figure 22] 2 is a diagram illustrating an example of a hardware configuration of a base station 10 or a terminal 20 according to an embodiment of the present invention. [Figure 23] FIG. 1 is a diagram illustrating an example of the configuration of a vehicle. DETAILED DESCRIPTION OF THE INVENTION

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

[0011] In operation of the wireless communication system according to the embodiment of the present invention, existing technology is used as appropriate, for example, existing LTE or existing NR, but is not limited to existing LTE or NR.

[0012] Furthermore, in the embodiments of the present invention described below, terms such as SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), and PUSCH (Physical Uplink Shared Channel) used in existing LTE or NR are used. This is for convenience of description, and similar signals, functions, etc. may be referred to by other names. Furthermore, the above-mentioned terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even signals used in NR are not necessarily designated as "NR-".

[0013] Furthermore, in the embodiments of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or other methods (for example, Flexible Duplex, etc.).

[0014] Furthermore, in the embodiments of the present invention, when radio parameters and the like are "configured," it may mean that predetermined values ​​are pre-configured, or that radio parameters notified from the base station 10 or the terminal 20 are set.

[0015] Fig. 1 is a diagram showing a configuration example (1) of a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, the wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each.

[0016] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The system information is, for example, transmitted via NR-PBCH and is also referred to as broadcast information. The synchronization signal and system information may be referred to as SSB (SS / PBCH block). As shown in FIG. 1 , the base station 10 transmits control signals or data to the terminal 20 in the downlink (DL) and receives control signals or data from the terminal 20 in the uplink (UL). Both the base station 10 and the terminal 20 are capable of transmitting and receiving signals by performing beamforming. Furthermore, both the base station 10 and the terminal 20 are capable of applying MIMO (Multiple Input Multiple Output) communication to the DL or UL. In addition, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) using CA (Carrier Aggregation). Furthermore, the terminal 20 may communicate via a primary cell of the base station 10 and a primary secondary cell group cell (PSCell: Primary SCG Cell) of another base station 10 using DC (Dual Connectivity).

[0017] The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, or an M2M (Machine-to-Machine) communication module. As shown in Fig. 1, the terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. The terminal 20 also receives various reference signals transmitted from the base station 10 and measures the propagation path quality based on the reception results of the reference signals.

[0018] Terminal 20 is capable of performing carrier aggregation, which aggregates multiple cells (multiple CCs (Component Carriers)) to communicate with base station 10. In carrier aggregation, one PCell (Primary cell) and one or more SCells (Secondary cells) are used. Also, a PUCCH-SCell having a PUCCH may be used.

[0019] Fig. 2 is a diagram illustrating an example (2) of a wireless communication system according to an embodiment of the present invention. Fig. 2 shows a configuration example of a wireless communication system in which DC (Dual connectivity) is implemented. As shown in Fig. 2, a base station 10A serving as an MN (Master Node) and a base station 10B serving as an SN (Secondary Node) are provided. The base station 10A and the base station 10B are each connected to a core network. The terminal 20 can communicate with both the base station 10A and the base station 10B.

[0020] A cell group provided by base station 10A, which is an MN, is called an MCG (Master Cell Group), and a cell group provided by base station 10B, which is an SN, is called an SCG (Secondary Cell Group). In addition, in a DC, an MCG is composed of one PCell and one or more SCells, and an SCG is composed of one PSCell (Primary SCG Cell) and one or more SCells.

[0021] The processing operations in this embodiment may be executed in the system configuration shown in FIG. 1, in the system configuration shown in FIG. 2, or in any other system configuration.

[0022] 3GPP is studying ways to enhance multi-carrier operation. Specifically, it is studying the operation of a terminal that supports up to two simultaneous transmissions in FR1 (Frequency Range 1) to dynamically switch the band for UL transmission across three or four bands. In the following explanation, the terms "carrier," "CC," and "cell" may be used interchangeably.

[0023] (About the assignment) In the conventional technologies (Rel-16, Rel-17), a UL Tx switching function (uplink transmission switching function) that can switch UL transmission between two bands (two carriers) is supported in terminal 20. Even in terminal 20 that has only two transmission chains (Tx Chains), by using the UL Tx switching function, it is possible to perform operations such as transmitting using two antenna ports for one carrier, or using one antenna port for one carrier and transmitting using another antenna port for another carrier by switching over time.

[0024] The Tx Chain is a physical function for transmission in the terminal 20, regardless of whether actual transmission is performed or not. One Tx Chain can perform transmission using one carrier. By switching the carrier used by the Tx Chain (the transmission function unit corresponding to the carrier), the carrier that can be transmitted by the Tx Chain can be switched.

[0025] An antenna port is an antenna that can actually transmit using a transmit chain (Tx Chain). The terms transmit chain and antenna port are sometimes used synonymously. Also, an "antenna port" may be called a "port."

[0026] In the following description, unless otherwise specified, one band has one carrier. Therefore, in this specification and claims, "band" may be replaced with "carrier" and "carrier" may be replaced with "band." However, having one carrier in one band is an example, and one band may have multiple carriers. When one band has multiple carriers, the number and relationship of the carriers may be limited, for example, to two carriers that are contiguous in frequency. Multiple carriers in one band may be treated the same as one UL band (carrier) in the following description.

[0027] 3GPP is considering "UL Tx switching schemes across up to 3 or 4 bands with restriction of up to 2 Tx simultaneous transmission for FR1 UEs" (a function that enables a terminal that supports up to two simultaneous transmissions in FR1 to dynamically switch the UL transmission band across 3 or 4 bands). For convenience, this function may be called "Rel-18 UL Tx switching."

[0028] The above function allows a terminal that cannot perform UL CA (Carrier Aggregation) or can perform only up to two UL CAs to set three or four UL bands (carriers) and dynamically instruct the base station 10 to transmit on one or two of these UL bands (carriers).

[0029] This function allows the terminal 20 to be instructed to perform UL transmission using a UL band (carrier) suitable for use in each time resource, taking into consideration the traffic conditions and TDD configuration among multiple UL bands (carriers). This improves frequency utilization efficiency and UL throughput.

[0030] Rel-16 and Rel-17 specify UL Tx switching between two bands. However, in Rel-18 UL Tx switching, it is not clear how to set the UL band (carrier) that is a candidate for switching to the terminal 20.

[0031] Conventionally, in a terminal 20 supporting UL CA, multiple DL / UL carriers can be configured as serving cells with the number of CCs of the UL CA supported by the terminal 20, and the UL CC to be used for transmission can be dynamically specified among them. However, in Rel-18 UL Tx switching, it is necessary to configure a number of UL carriers greater than the number of CCs of the UL CA supported by the UL CA. However, conventional technology does not anticipate configuring a number of UL CCs greater than the supported number.

[0032] Another existing technology is supplemental uplink (SUL). The SUL framework supports linking with and dynamic switching to normal uplink (NUL), but it is not intended to be extended.

[0033] In the following, we first explain UL Tx switching for Rel-16 and R-17. Then we explain the capabilities and configuration information proposed for Rel-18 UL Tx switching. However, the capabilities and configuration information specified for UL Tx switching for Rel-16 and R-17 may also be applied to Rel-18 UL Tx switching.

[0034] We will also explain the UL Tx switching for Rel-16 and R-17. Regarding power boosting, switching period, DL interruption, etc., the operation of these factors is basically the same in Rel-18 UL Tx switching as in Rel-16 and R-17.

[0035] (UL Tx switching in Rel-16) In Rel-16, the terminal 20 supports two carriers and has two transmission chains. One transmission chain is fixed to one carrier, while the other transmission chain can be associated with either of the two carriers using a switch. This allows, for example, simultaneous transmission using two antenna ports on one carrier. It is also possible for each antenna port to transmit using one carrier per antenna port. These methods can be dynamically switched. UL Tx switching in Rel-16 is called Rel-16 1Tx-2Tx switching.

[0036] As shown in FIG. 3, a configuration in which each transmission chain is associated with one carrier is called Case 1, and a configuration in which two transmission chains are associated with one carrier is called Case 2.

[0037] Figure 4 shows the configuration of the transmission chains used for transmission in the SUL for Case 1 and Case 2. For example, 1T+1T in Case 1 means that in the example of Figure 3, carrier 2 is connected to transmission chain 1, and carrier 1 is connected to transmission chain 2.

[0038] Also, 1P+0P in the 1T+1T state means that transmission is performed using carrier 1 on antenna port 2, but no transmission is performed on antenna port 1. In SUL, two carriers cannot be configured simultaneously, so 1P+1P does not exist. Also, in SUL, transmission of only NUL (carrier 2) is not assumed in case 1, so 0P+1P does not exist.

[0039] Also, "0P+2P, 0P+1P" in case 2 means that transmission is performed using carrier 2 on antenna port 1 and antenna port 2, or that transmission is performed using carrier 2 on antenna port 1 only.

[0040] Rel-16 1Tx-2Tx switching in inter-band CA / EN-DC has two options: Option 1, which does not allow two carriers to be used simultaneously, and Option 2, which allows two carriers to be used simultaneously. The transmit chain configuration used for transmission in Option 1 is the same as that shown in Figure 4. The transmit chain configuration used for transmission in Option 2 is as shown in Figure 5.

[0041] Fig. 6 shows an example of UE capability that is specified in accordance with Rel-16 1Tx-2Tx switching and that is reported from terminal 20 to base station 10. Fig. 7 shows an example of CellGroupConfig and ServingCellConfig that are specified in accordance with Rel-16 1Tx-2Tx switching and that are set in terminal 20 by base station 10.

[0042] The uplinkTxSwitchingPeriodLocation-r16 in the ServingCellConfig indicates whether a UL Tx switching period is configured in the target cell (carrier). Examples of operation related to the UL Tx switching period are shown in Figures 8 and 9. Figure 8 shows an example in which a UL Tx switching period is configured to occur in carrier 1. In this case, a UL Tx switching period occurs in carrier 1 whether switching from carrier 1 to carrier 2 or from carrier 2 to carrier 1 is performed. For example, in the case of Figure 8, if an instruction to switch to carrier 2 is received while transmitting on carrier 1, transmission on carrier 2 will occur after the switching time (switching period) on carrier 1. Figure 9 shows an example in which a UL Tx switching period is configured to occur in carrier 2.

[0043] When dynamically switching between two carriers, terminal 20 is allowed a DL interruption of a predetermined length in the DL carrier that overlaps with the UL switching period. The length (X OFDM symbols) is specified as shown in Figure 10.

[0044] The UL Tx switching in Rel-16 can be summarized as follows: Based on PUSCH scheduling (scheduling command, rank adaptation) from the base station 10, the terminal 20 can dynamically switch between "single-port transmission on carrier 1," "single-port transmission on carrier 2," "single-port transmission on carrier 1 + single-port transmission on carrier 2" (applicable only when option 2 is supported in inter-band CA), and "dual-port transmission on carrier 2 (with or without 3 dB power boosting)."

[0045] When the carrier connected to the transmission port is switched, a switching period occurs, during which UL transmission is not performed on either carrier. Also, DL interruptions may occur during the switching period. <rel-17> Next, Rel-17 will be described. In Rel-17, two transmission chains each can support two carriers, resulting in 2Tx-2Tx UL Tx switching. Since two-port transmission is also possible with carrier 1, compared to Rel-16, case 3 is added to cases 1 and 2 as connection patterns of transmission chains and carriers, as shown in FIG. 11. Therefore, it is necessary for the terminal 20 and the base station 10 to distinguish between Rel-17 (2Tx-2Tx UL Tx switching) and Rel-16 (1Tx-2Tx).

[0046] In Rel-17 (2Tx-2Tx UL Tx switching), the pattern of the number of transmit ports in each case is as shown in Figure 12. Figure 12 shows the pattern of the number of transmit ports for each case and each option (whether simultaneous transmission of two carriers is possible or not).

[0047] Here, for example, if 1P+0P is instructed in case 2 for terminal 20 performing UL CA option 2, or if 0P+1P is instructed in case 3, terminal 20 must decide which of the remaining two cases to switch to.

[0048] Fig. 13 shows an example of RRC settings in Rel-17. In Fig. 13, uplinkTxSwitching-2T-Mode-r17 indicates a setting to switch to 2Tx-2Tx UL Tx switching mode, and uplinkTxSwitching-DualUL-TxState-r17 is information for setting which case to switch to when there are multiple candidates for which case to switch to at the time of switching, as described above.

[0049] In addition, the UL Tx switching of Rel-17 supports the use of two consecutive carriers in one of two bands, as shown in Figure 14. Examples of transmit port configurations for each case in the example of Figure 14 are shown in Figures 15 and 16.

[0050] The functions, setting values, and specified values ​​of Rel-16 and R-17 described above may be applied to Rel-18 UL Tx switching.

[0051] (Rel-18 UL Tx switching) The possible cases for Rel-18 UL Tx switching and the configuration of the ports that transmit in each case are shown in Figures 17 and 18. Here, as an example, four bands, A to B, are available for UL Tx switching.

[0052] As shown in Figure 17, there are two Tx Chains (two antenna ports), each of which can be switched to one of bands A to D. This is referred to as "2Tx-2Tx (-2Tx-2Tx) switching." Assuming that one carrier can be used in each band, the maximum number of cases is 10, as shown in Figure 18 (assuming CA option 2).

[0053] In addition to the above assumptions, a case of 1Tx-2Tx (-1Tx-1Tx) switching, in which the band (carrier) that one port can use is fixed, can also be considered.

[0054] Furthermore, as shown in FIG. 14, there may be cases where some bands have two consecutive carriers (a total of five or more carriers).

[0055] Regarding the Rel-18 UL Tx switching assumed as above, there is no prior art regarding the capability report from the terminal 20 to the base station 10 and the contents of the settings / instructions from the base station 10 to the terminal 20. Therefore, with the prior art, it may not be possible to properly implement "UL Tx switching schemes across up to 3 or 4 bands with the restriction of up to 2 Tx simultaneous transmission."

[0056] Therefore, in this embodiment, a capability report and settings / instructions that enable appropriate implementation of "UL Tx switching schemes across up to 3 or 4 bands with the restriction of up to 2 Tx simultaneous transmission" will be described.

[0057] In this embodiment, "UL Tx switching schemes across up to 3 or 4 bands with the restriction of up to 2 Tx simultaneous transmission" is assumed, but this is just an example. The maximum number of bands within which transmission switching is performed may be greater than 4. Furthermore, the number of antenna ports used for transmission may be greater than 2. In other words, simultaneous transmission may occur on three or more antenna ports.

[0058] (Outline of the embodiment) This embodiment includes a first embodiment and a second embodiment. An example of a basic operation common to the first and second embodiments will be described with reference to Fig. 19 .

[0059] In S101, the terminal 20 transmits capability information to the base station 10. An example of the capability information will be described in the first embodiment. In S102, the base station 10 transmits setting information (or instruction information) to the terminal 20. An example of the setting information / instruction information will be described in the second embodiment.

[0060] The base station 10 determines the setting / instruction contents for the terminal 20 within the range of the capability of the terminal 20 indicated in the capability information of the terminal 20 received in S101, creates the setting information / instruction information, and transmits it in S102. However, this assumption is just an example.

[0061] The terminal 20 that received the setting information / instruction information in S102 operates in accordance with that information. When the terminal 20 receives DCI from the base station 10 in S103, for example, in accordance with the setting information, the terminal 20 switches the band to which the port connects based on the DCI, and performs transmission through the port after the switch in S104.

[0062] The transmission of the configuration information / instruction information at S102 may be performed by any of RRC signaling, MAC CE, and DCI. The first and second embodiments are each outlined below.

[0063] <Outline of the first embodiment> The terminal 20 reports at least one of the following multiple pieces of capability information as capability information (capability) that it supports for Rel-18 UL Tx switching to the base station 10. All of the examples listed below are examples of capability information related to bands.

[0064] Supported band combinations for UL Tx switching (e.g., up to 3 or 4 bands) Number of CCs supported by each band Whether or not a DL carrier (downlink carrier) is required for each band - For each combination of switching bands (simultaneous transmission support, switching period, bands where DL interruption occurs, power boosting support) Number of band-switchable ports - Target band of the port where the band is fixed - Candidate bands for switching each port <Outline of the second embodiment> The terminal 20 receives at least one of the multiple pieces of setting information / instruction information listed below from the base station 10 as setting information / instruction information for Rel-18 UL Tx switching. In other words, the base station 10 transmits at least one of the multiple pieces of setting information / instruction information listed below to the terminal 20. All of the examples listed below are examples of information related to band switching.

[0065] DL / UL serving cell and UL only serving cell (or either DL / UL serving cell or UL only serving cell) including UL for Rel-18 UL Tx switching Other serving cells for which switching and / or simultaneous transmission may be instructed in each serving cell For each serving cell, for each combination with other serving cells, {whether or not a switching period is included, whether power boosting is allowed, whether simultaneous transmission is allowed, and case interpretation when switching from a specific port configuration to another specific port configuration is instructed} Number of ports for band switching Whether each serving cell is linked to a port that is subject to band switching (or not) The first and second embodiments will be described in detail below. Each of Examples 1 to 9 of the first embodiment can be implemented in combination with any of Examples 1 to 9 of the second embodiment.

[0066] (First embodiment) In the first embodiment, the terminal 20 reports to the base station at least one of the capability information shown in the following examples 1 to 9. Alternatively, the terminal 20 may report information that combines any or all of the capability information shown in examples 1 to 9.

[0067] <Example 1> The terminal 20 reports information about one or more band combinations (BCs) for UL Tx switching supported for Rel-18 UL Tx switching to the base station 10 separately from the BC for UL CA.

[0068] The reported band combinations (BCs) for UL Tx switching may include BCs that are not compliant with UL CA. Each BC included in one or more band combinations (BCs) for UL Tx switching may be information indicating a combination of bands to be switched.

[0069] For example, when the terminal 20 reports BC1, BC2, and BC3 as BCs for UL CA, the terminal 20 may report BC4 and BC5 as band combinations (BCs) for UL Tx switching.

[0070] As a variation, there may be a restriction that each BC included in one or more band combinations (BCs) for UL Tx switching to be reported must be a BC that supports UL CA.

[0071] As another variation, when reporting a BC for UL Tx switching in Rel-18, it may be necessary to report the capabilities specified in Rel-16 / 17 for each band combination within the BC. In this case, for example, when reporting a BC for Bands ABC in Rel-18, it is necessary to report the capabilities specified in Rel-16 / 17 for AB, AC, and BC.

[0072] As another variation, when reporting a BC for UL Tx switching in Rel-18, there may be a restriction that each "band combination" within the BC must be supported. In this case, for example, when reporting a BC for Band ABC in Rel-18, it is also necessary to support AB, AC, and BC.

[0073] <Example 2> The terminal 20 reports to the base station 10 information about the number of CCs supported in each band of the BC for UL Tx switching described in Example 1. The information about the number of CCs may be the number of CCs (number of cells) itself. Note that the band in Example 2 (the band for which the number of CCs is reported) may be a band other than the band within the BC reported in Example 1.

[0074] Furthermore, the specifications may specify the upper limit of the number of CCs or the total bandwidth that can be supported in each band in Rel-18 UL Tx switching. For example, for each band, the number of CCs that terminal 20 can support may be specified as "up to two consecutive CCs" or "consecutive CCs within a 100 MHz band." Furthermore, the upper limit of the number of CCs that can be supported or the total bandwidth may be specified for TDD and FDD separately, rather than for each band. For example, base station 10 sets CCs within the band for UL Tx switching for terminal 20 according to these specifications.

[0075] <Example 3> The terminal 20 reports to the base station 10 information on whether or not a DL carrier associated with each band of the BC for UL Tx switching described in Example 1 is required. For example, if there are bands A, B, and C for a certain BC, the terminal 20 reports information such as {band A: DL carrier required, band B: DL carrier not required, band C: DL carrier not required} for the BC. Note that the terminal 20 basically only needs to be able to perform DL reception with any of the carriers, and therefore may determine that a DL carrier is not required in a certain band.

[0076] In addition, the specifications may specify conditions for UL carriers / bands that do not require an associated DL carrier. Examples of such conditions include TDD (or FDD), a specific band, or only when a specific band is included in the BC.

[0077] Note that the band in Example 3 (the band for reporting whether or not the DL carrier is necessary) may be a band other than the band within the BC reported in Example 1.

[0078] <Example 4> The terminal 20 reports to the base station 10 information on whether simultaneous transmission is supported for each combination of bands to be switched in the BC for UL Tx switching described in Example 1.

[0079] For example, the terminal 20 reports to the base station 10 information such as that in BC of bands ABCD, bands AB are capable of simultaneous transmission (dual UL or both) and bands AC and AD are not capable of simultaneous transmission (switched UL).

[0080] In addition, the terminal 20 may report to the base station 10 information regarding whether simultaneous transmission is supported for each band, or for all combinations within a BC, or for all BCs for Rel-18 UL Tx switching supported by the terminal 20, rather than for each combination of bands to be switched.

[0081] The band in Example 4 (the band for which the presence or absence of simultaneous transmission support is reported) may be a band other than the band within the BC reported in Example 1.

[0082] <Example 5> The terminal 20 reports information about the switching period for each combination of bands to be switched in the BC for UL Tx switching described in Example 1. The information about the switching period may be the value of the switching period.

[0083] For example, the terminal 20 reports to the base station 10 information such as that in BC of band ABCD, the switching period for band AB is n35 μs, and for AC and AD it is n140 μs.

[0084] Furthermore, the terminal 20 may report to the base station 10 information on the switching period not for each combination of bands to be switched, but for each band, or for all combinations within the above BCs, or for all BCs for Rel-18 UL Tx switching supported by the terminal.

[0085] Additionally, new candidate values ​​for the switching period may be defined for Rel-18 UL Tx switching, and some values ​​that could be reported for Rel-16 / 17 may not be reportable for Rel-18.

[0086] Note that the band in Example 5 (the band for reporting the switching period) may be a band other than the band within the BC reported in Example 1.

[0087] <Example 6> The terminal 20 may report the bands in which DL interruption occurs for each combination of bands switched in the BC for UL Tx switching described in Example 1.

[0088] For example, terminal 20 reports to base station 10 that, for BC of band ABCD, 0100 is reported for band AB and 1010 is reported for AC. This bitmap indicates band ABCD, and means that a DL interruption occurs when switching in the band corresponding to a bit of 1.

[0089] Furthermore, the terminal 20 may report to the base station 10 information on the bands in which DL interruptions occur, not for each combination of bands to be switched, but for each band, or for all combinations within the above BCs, or for all BCs for Rel-18 UL Tx switching supported by the terminal.

[0090] Furthermore, the specifications may stipulate whether DL interruption is permitted for each band combination for Rel-18 UL Tx switching or for each combination of two bands within a band combination.

[0091] Note that the band in Example 6 (the band for reporting DL interruption) may be a band other than the band within the BC reported in Example 1.

[0092] In Example 6, when the base station 10 receives information indicating that a DL interruption will occur in a certain band, the base station 10 may, for example, schedule DL reception in that band, taking into account the possibility of a DL interruption occurring.

[0093] <Example 7> The terminal 20 may report information on whether power boosting is supported for each combination of bands switched in the BC for UL Tx switching described in Example 1.

[0094] For example, terminal 20 reports to base station 10 information such as, for BC of band ABCD, power boosting is possible in band AB, but not possible in AC and AD. "Power boosting possible in band AB" means, for example, that when terminal 20 switches ports between bands AB and ends up transmitting from two ports in one band, it is possible to increase the transmission power (output power). Alternatively, "power boosting possible in band AB" may mean that it is possible to increase the transmission power (output power) when transmitting simultaneously on bands A and B.

[0095] Furthermore, the terminal 20 may report to the base station 10 information on whether power boosting is supported for each band, or for all combinations within a BC, or for all BCs for Rel-18 UL Tx switching supported by the terminal, rather than for each combination of bands to be switched.

[0096] The band in Example 7 (the band for which the possibility of power boosting is reported) may be a band other than the band within the BC reported in Example 1.

[0097] When the base station 10 receives information indicating that power boosting is possible in a certain band, it may perform transmission power control on the terminal 20 using DCI or MAC CE so that power boosting is performed when scheduling simultaneous two-port transmission in that band.

[0098] <Example 8> The terminal 20 may report to the base station 10 information regarding the number of ports (e.g., 1 or 2) that can switch bands within the BC for UL Tx switching described in Example 1. Also, if there is a port for which the band is fixed, the terminal 20 may report the target band of the port for which the band is fixed. For example, the terminal 20 may report to the base station 10 information such as "Port 1 is fixed to Band A in a BC of Bands ABCD."

[0099] In addition, if there is a port for which the band is fixed, a predetermined number of layers (e.g., 2) may be reported as the number of MIMO layers for that target band, and the predetermined number of layers (e.g., 2) may not be reported as the number of MIMO layers for other bands.

[0100] The band in Example 8 (the band for which the number of band-switchable ports is reported) may be a band other than the band within the BC reported in Example 1.

[0101] <Example 9> The terminal 20 may report information about switching candidate bands for each port in the BC for UL Tx switching described in Example 1. For example, the terminal 20 reports to the base station 10 information such as, in the BC for band ABCD, A and B are switching candidates for port 1, and A, B, C, and D are switching candidates for port 2.

[0102] Furthermore, the terminal 20 may report to the base station 10 the number of ports supported in each band within the BC (for example, A is 2, B is 2, C is 1, D is 1, etc.).

[0103] The band (switching candidate band) in Example 9 may be a band other than the band within the BC reported in Example 1.

[0104] As described above, the technology according to the first embodiment explained using Examples 1 to 9 allows the base station 10 to know the UL Tx switching capabilities of the terminal 20, and therefore makes it possible to perform settings, instructions, or scheduling to appropriately perform UL Tx switching.

[0105] (Second embodiment) In the second embodiment, the terminal 20 is configured or instructed by the base station 10 to use at least one of the following examples 1 to 9 by using any one or a combination of several of RRC signaling, MAC-CE, and DCI. Also, the base station 10 may configure or instruct the terminal 20 to use any or all combinations of examples 1 to 9.

[0106] <Example 1> The terminal 20 is configured with a DL / UL serving cell (a cell having a UL carrier and a DL carrier) including a UL used for Rel-18 UL Tx switching, or a UL only serving cell (a cell with only a UL carrier) including a UL used for Rel-18 UL Tx switching, from the base station 10. The terminal 20 may be configured with both a DL / UL serving cell including a UL used for Rel-18 UL Tx switching and a UL only serving cell including a UL used for Rel-18 UL Tx switching from the base station 10. Here, "certain information is configured" means that the terminal 20 receives the information from the base station 10.

[0107] The base station 10 can determine which cell to set for the terminal 20 based on the Capability received from the terminal 20 in the first embodiment. For example, the base station 10 can set a cell (carrier) included in the BC received in Example 1 of the first embodiment as a serving cell for the terminal 20.

[0108] Furthermore, for example, the base station 10 may set a cell in a band where the DL carrier is not required as a UL only serving cell to the terminal 20 based on the information received in Example 3 of the first embodiment.

[0109] The serving cell in the following Examples 2 to 9 is the cell set for terminal 20 in Example 1. However, this is not limited to this, and the serving cell in the following Examples 2 to 9 may be a cell other than the cell set in Example 1.

[0110] The settings / instructions in the following Examples 2 to 9 may be made when the cell is set in Example 1, or may be made at a timing after the cell is set in Example 1.

[0111] <Example 2> When the terminal 20 receives a specific IE / parameter from the base station 10 by the ServingCellConfig for a certain cell, the specific IE / parameter is set in the terminal 20.

[0112] The terminal 20 may recognize that the cell includes a UL used for Rel-18 UL Tx switching based on a specific IE / parameter received from the base station 10. Note that ServingCellConfig is an example, and other messages or signals may be used.

[0113] <Example 3> The terminal 20 may recognize that a cell is a UL-only serving cell used for Rel-18 UL Tx switching when a specific IE / parameter is set by the ServingCellConfig for that cell from the base station 10.

[0114] Furthermore, the terminal 20 may recognize from the base station 10 that a particular IE / parameter is not set in the ServingCellConfig for a certain cell, and therefore the cell is a UL-only serving cell used for Rel-18 UL Tx switching.

[0115] Note that ServingCellConfig is an example, and other messages or signals may be used.

[0116] <Example 4> Information about other serving cells for which switching and / or simultaneous transmission can be instructed in each serving cell is set in terminal 20 by base station 10. For example, it is assumed that ServingCellConfig includes information about other serving cells for which switching / simultaneous transmission can be instructed.

[0117] For example, when terminal 20 receives an RRC message (e.g., ServingCellConfig) for cell A and detects in that RRC message that cell B is another serving cell for which switching / simultaneous transmission may be instructed, it assumes that switching / simultaneous transmission between cell A and cell B may be instructed.

[0118] <Example 5> Terminal 20 may be configured with information regarding whether or not a switching period is included in each serving cell for each combination with another serving cell from base station 10. Alternatively, information regarding whether or not a switching period is included may be configured for each serving cell or for each cell group, rather than for each combination with another serving cell.

[0119] For example, assume that a certain RRC message (e.g., ServingCellConfig, CellGroupConfig) includes information on whether or not a switching period is included. For example, assume that terminal 20 receives an RRC message for cell A and detects information in the RRC message that means that "when switching between cell A and cell B, a switching period exists in cell B." In this case, when terminal 20 receives UL scheduling information that causes switching between cell A and cell B, it performs switching in the switching period on the cell B side.

[0120] <Example 6> Information regarding whether power boosting is permitted for each serving cell and each combination with other serving cells is set to terminal 20 by base station 10. Alternatively, information regarding whether power boosting is permitted may be set on a serving cell basis or on a cell group basis, rather than on a combination with other serving cells.

[0121] For example, assume that a certain RRC message (e.g., ServingCellConfig, CellGroupConfig) contains information on whether power boosting is permitted. In this case, assume that terminal 20 receives the RRC message and detects information in the RRC message that means "power boosting is permitted when two-port simultaneous transmission is performed in cell A during switching between cell A and cell B." In this case, terminal 20 performs power boosting when it receives UL scheduling information indicating that two-port simultaneous transmission occurs in cell A due to switching from cell B to cell A.

[0122] <Example 7> Information regarding whether simultaneous transmission is permitted for each serving cell in combination with other serving cells is set to terminal 20 from base station 10. Alternatively, information regarding whether simultaneous transmission is permitted may be set on a serving cell basis or on a cell group basis, rather than on a combination with other serving cells. Regarding the setting on a serving cell basis, for example, if "simultaneous transmission OK" is set for cell A, this may mean that simultaneous transmission is OK with any cell in combination with cell A.

[0123] For example, assume that a certain RRC message (e.g., ServingCellConfig, CellGroupConfig) contains information regarding whether simultaneous transmission is permitted. In this case, assume that terminal 20 receives an RRC message for cell A and detects information within the RRC message indicating that "simultaneous transmission is permitted in cell A and cell B." In this case, it is assumed that terminal 20 receives UL scheduling information that causes simultaneous transmission in cell A and cell B. In this case, base station 10 can perform UL scheduling for terminal 20 that causes simultaneous transmission in cell A and cell B.

[0124] <Example 8> Terminal 20 may be configured with information regarding case interpretation when a switching instruction from a specific port configuration to another specific port configuration is given in each serving cell for each combination with another serving cell from base station 10. Alternatively, terminal 20 may be configured with information regarding case interpretation when a switching instruction from a specific port configuration to another specific port configuration is given in units of serving cells or cell groups, rather than for each combination with another serving cell.

[0125] For example, assume that information regarding case interpretation is included in a certain RRC message (e.g., ServingCellConfig, CellGroupConfig).

[0126] At this time, for example, when the terminal 20 receives the above RRC message and detects that the RRC message contains "information for uniquely determining the case number of the destination when transitioning from a certain Tx chain state (certain case number) to another Tx chain state (another case number) after UL Tx switching and the case number of the destination cannot be uniquely determined," it determines the Tx chain (port configuration) to transition to after UL Tx switching according to the information.

[0127] The above "information for determination" may be an explicit "pair of case number before transition and case number to transition to," or it may be information indicating that "two ports are connected to one carrier," or information indicating that "one port is connected to one carrier."

[0128] As an example, assume that the case configurations and transmission port configurations in Figures 17 and 18 are used. Also, assume that "option 2: simultaneous transmission across up to 2 carriers" is set. For ease of explanation, assume that only Case 1, Case 2, and Case 3 in Figure 18 are used.

[0129] Assume that the above explicit information is set in terminal 20 as follows: "If terminal 20 is in case 2 before transition and there are cases 1 and 3 as candidate transition destinations, transition to case 3." In this case, terminal 20 switches to case 3 when, while in the case 2 state, scheduling equivalent to 1P+0P+0P+0P is performed by DCI.

[0130] It is assumed that the above information indicating that "one port is connected to one carrier" is set in the terminal 20. In this case, when the terminal 20 is in the state of case 2 and UL transmission of 1P+0P+0P+0P is scheduled by DCI, the terminal 20 switches to case 1.

[0131] The base station 10 can perform subsequent scheduling by assuming the above-mentioned transition destination.

[0132] <Example 9> Information regarding the number of ports to be subject to band switching for each cell group is set to the terminal 20 by the base station 10. In addition to this, or instead of this, information regarding whether or not each serving cell is linked to a port to be subject to band switching may be set to the terminal 20 by the base station 10. Furthermore, information regarding whether or not each serving cell is linked to a port not to be subject to band switching may be set to the terminal 20 by the base station 10.

[0133] Information about whether a serving cell is associated with a port that is subject to band switching is an example of information about an antenna port that is subject to band switching. Information about whether a serving cell is associated with a port that is not subject to band switching is an example of information about an antenna port that is not subject to band switching.

[0134] For example, when terminal 20 receives information from base station 10 via an RRC message that corresponds to "cells A and B are subject to switching of port 1, and cell C uses port 2 fixedly," it is assumed that scheduling is performed corresponding to "transmission is performed in cell A or cell B using port 1, and in cell C using port 2." Furthermore, base station 10 can perform scheduling for terminal 20 that corresponds to "transmission is performed in cell A or cell B using port 1, and in cell C using port 2."

[0135] As described above, the technology according to the second embodiment explained using Examples 1 to 9 allows the base station 10 to set / instruct the terminal 20 according to its capabilities related to UL Tx switching, thereby enabling the UL Tx switching to be performed appropriately.

[0136] (Device configuration) Next, an example of the functional configuration of the base station 10 and the terminal 20 that execute the processes and operations described above will be described.

[0137] <Base station 10> Fig. 20 is a diagram showing an example of the functional configuration of the base station 10. As shown in Fig. 20, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 20 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations according to the embodiment of the present invention. Furthermore, the transmitting unit 110 and the receiving unit 120 may be collectively referred to as a communication unit.

[0138] The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiver 120 has a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of a higher layer from the received signals. The transmitter 110 also has a function of transmitting, to the terminal 20, an NR-PSS, an NR-SSS, an NR-PBCH, a DL / UL control signal, DCI via a PDCCH, data via a PDSCH, and the like.

[0139] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in a storage device provided in the setting unit 130, and reads out the information from the storage device as needed.

[0140] The control unit 140 schedules DL reception or UL transmission of the terminal 20 via the transmission unit 110. The control unit 140 also includes a function for performing LBT. The functional unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the reception unit 120. The transmission unit 110 may also be called a transmitter, and the reception unit 120 may also be called a receiver.

[0141] <Terminal 20> Fig. 21 is a diagram showing an example of the functional configuration of the terminal 20. As shown in Fig. 21, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 11 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations related to the embodiment of the present invention. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

[0142] The transmitter 210 creates a transmission signal from transmission data and transmits the transmission signal wirelessly. The receiver 220 wirelessly receives various signals and acquires a higher layer signal from the received physical layer signal. The receiver 220 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals, DCI via PDCCH, data via PDSCH, and the like transmitted from the base station 10. For example, the transmitter 210 may transmit a PSCCH (Physical Sidelink Control Channel), a PSSCH (Physical Sidelink Shared Channel), a PSDCH (Physical Sidelink Discovery Channel), a PSBCH (Physical Sidelink Broadcast Channel), and the like to another terminal 20 as D2D communication, and the receiver 220 may receive the PSCCH, PSSCH, PSDCH, or PSBCH from the other terminal 20. The transmitter 210 also includes the antenna port described in this embodiment.

[0143] The setting unit 230 stores various pieces of setting information received from the base station 10 or other terminals by the receiving unit 220 in a storage device provided in the setting unit 230, and reads the information from the storage device as needed. The setting unit 230 also stores setting information that is set in advance.

[0144] The control unit 240 controls the terminal 20. The functional unit in the control unit 240 related to signal transmission may be included in the transmission unit 210, and the functional unit in the control unit 240 related to signal reception may be included in the reception unit 220. Furthermore, the transmission unit 210 may be called a transmitter, and the reception unit 220 may be called a receiver.

[0145] This embodiment provides at least the following terminal, base station, and communication method. The terminal, base station, and communication method will be described below in six supplementary notes 1 to 6.

[0146] <Appendix 1> (Additional note 1) In a transmission switching method in which at least one antenna port among a plurality of antenna ports can switch bands across two or more bands, and a total of three or more bands are used for transmission by the plurality of antenna ports, the method comprises: a transmitter that reports to a base station the number of antenna ports that can switch bands as capability information; a receiving unit that receives, from the base station, information regarding antenna ports that are to be subjected to band switching or information regarding antenna ports that are not to be subjected to band switching; A terminal comprising: (Additional note 2) In a transmission switching method in which at least one antenna port among a plurality of antenna ports can switch bands across two or more bands, and bands used for transmission are switched across a total of three or more bands for the plurality of antenna ports, a transmitter that reports information on bands used by antenna ports that do not undergo band switching to a base station as capability information; a receiving unit that receives, from the base station, information regarding antenna ports that are to be subjected to band switching or information regarding antenna ports that are not to be subjected to band switching; A terminal comprising: (Additional note 3) When there is an antenna port for which band switching is not performed, the transmitter reports the number of MIMO layers of the band used by the antenna port as 2. A terminal as described in appendix 1 or 2. (Additional note 4) The transmitter reports information about a band that is a candidate for switching at each antenna port. A terminal according to any one of appendix 1 to 3. (Additional note 5) In a transmission switching method in which at least one antenna port of a plurality of antenna ports in a terminal can switch bands across two or more bands, and the bands used for transmission are switched across a total of three or more bands for the plurality of antenna ports, a receiving unit that receives from the terminal the number of antenna ports that can switch bands as capability information; a transmitter that transmits to the terminal information regarding an antenna port that is a target for band switching or information regarding an antenna port that is not a target for band switching; A base station comprising: (Additional note 6) In a transmission switching method in which at least one antenna port among a plurality of antenna ports can switch bands across two or more bands and the bands used for transmission are switched across a total of three or more bands for the plurality of antenna ports, the method reports the number of antenna ports capable of band switching to a base station as capability information; Receive information about antenna ports that are targets for band switching or information about antenna ports that are not targets for band switching from the base station. The communication method implemented by the device.

[0147] Any of the above items 1 to 6 provides a technology that enables appropriate switching of a band used for uplink transmission in a wireless communication system. According to supplementary item 3, the number of MIMO layers can be appropriately set. According to supplementary item 4, simultaneous monitoring can be clearly defined, and operation becomes clear. A single control information can be received well in the scheduling source cell. According to supplementary item 3, candidate bands for switching become clear.

[0148] <Appendix 2> (Additional note 1) In a transmission switching method in which at least one antenna port among a plurality of antenna ports can switch bands across two or more bands, and bands used for transmission are switched across a total of three or more bands for the plurality of antenna ports, a transmitter that reports information about bands used in the transmission switching method to a base station as capability information; a receiving unit that receives, from the base station, information for determining one of a plurality of states to be a transition destination when a transition from a certain state related to a plurality of antenna ports to another state occurs due to band switching; A terminal comprising: (Additional note 2) The receiving unit receives, as information for determining the one state, the maximum number of antenna ports that can be used for transmission in one band, or a pair of a state before transition and a state after transition. A terminal as described in appendix 1. (Additional note 3) The transmitter reports to the base station the number of carriers supported in the band used in the transmission switching method. A terminal as described in appendix 1 or 2. (Additional note 4) The transmitter reports information regarding whether a downlink carrier is required in the band used in the transmission switching method. A terminal according to any one of appendix 1 to 3. (Additional note 5) In a transmission switching method in which at least one antenna port of a plurality of antenna ports in a terminal can switch bands across two or more bands, and bands used for transmission are switched across a total of three or more bands for the plurality of antenna ports, a receiving unit that receives information about bands used in the transmission switching method from the terminal as capability information; a transmitting unit that transmits, to the terminal, information for determining one of a plurality of states when there are a plurality of candidate states for a transition from a certain state related to a plurality of antenna ports to another state by band switching; A base station comprising: (Additional note 6) In a transmission switching method in which at least one antenna port among a plurality of antenna ports can switch bands across two or more bands and the bands used for transmission are switched across a total of three or more bands for the plurality of antenna ports, reporting information about the bands used in the transmission switching method to a base station as capability information; When a transition from a certain state related to a plurality of antenna ports to another state occurs due to band switching, and there are a plurality of candidate states for the transition destination, information for determining one of the plurality of states is received from the base station. The communication method implemented by the device.

[0149] Any of the above items 1 to 6 provides a technology that enables a wireless communication system to appropriately switch the band used for uplink transmission. According to supplementary item 2, ambiguity of the transition destination is resolved, enabling appropriate operation. According to supplementary item 3, the number of carriers in a band becomes clear. According to supplementary item 4, it becomes possible to set a cell that does not have a downlink carrier.

[0150] <Appendix 3> (Additional note 1) In a transmission switching scheme in which at least one antenna port among a plurality of antenna ports can switch bands across two or more bands, and a total of three or more bands are used for switching bands used for transmission across the plurality of antenna ports, a transmitter that reports capability information indicating whether power boosting is possible when transmitting using the plurality of antenna ports to a base station; a receiving unit that receives, from the base station, information regarding whether power boosting is permitted when transmitting using a plurality of antenna ports; A terminal comprising: (Additional note 2) The transmitter reports to the base station the capability information indicating whether power boosting is possible for each combination of bands to be switched within a band combination, for each band, for all combinations of bands within a band combination, or for all supported band combinations. A terminal as described in appendix 1. (Additional note 3) The receiving unit receives information regarding whether or not power boosting is permitted for each combination of serving cells, each serving cell, or each cell group. A terminal as described in appendix 1 or 2. (Additional note 4) In a transmission switching method in which at least one antenna port of a terminal can switch bands across two or more bands, and a band used for transmission is switched across a total of three or more bands for the multiple antenna ports, a receiver receives capability information from the terminal that indicates whether power boosting is possible when transmitting using the multiple antenna ports; a transmitting unit that transmits information to the terminal regarding whether or not power boosting is permitted when transmitting using a plurality of antenna ports; A base station comprising: (Additional note 5) In a transmission switching scheme in which at least one antenna port among a plurality of antenna ports can switch bands across two or more bands and the bands used for transmission are switched across a total of three or more bands for the plurality of antenna ports, reporting capability information indicating whether power boosting is possible when transmitting using the plurality of antenna ports to a base station; Receives information from the base station as to whether power boosting is permitted when transmitting using multiple antenna ports. The communication method implemented by the device.

[0151] Any of the above items 1 to 5 provides a technique that enables a band used for uplink transmission to be appropriately switched in a wireless communication system. According to Supplementary Item 2, information on power boosting can be reported in various units. According to Supplementary Item 3, information on power boosting can be set in various units.

[0152] <Appendix 4> (Additional note 1) In a transmission switching method in which at least one antenna port among a plurality of antenna ports can switch bands across two or more bands, and the bands used for transmission by the plurality of antenna ports are switched across a total of three or more bands, a transmitter that reports capability information related to a band in which downlink communication interruption occurs at the time of switching to a base station; a receiving unit that receives control information for scheduling uplink transmission from the base station; A terminal comprising: (Additional note 2) The transmitter reports to the base station the capability information regarding bands in which downlink communication interruption occurs during switching for each combination of bands for which transmission switching is performed within the band combination, for each band, for all combinations of bands within the band combination, or for all supported band combinations. A terminal as described in appendix 1. (Additional note 3) The transmitting unit reports, as the capability information, a bitmap in which each bit indicates whether or not there is a downstream communication interruption in a band. A terminal as described in appendix 1 or 2. (Additional note 4) In a transmission switching method in which at least one antenna port of a terminal can switch bands across two or more bands, and the bands used for transmission are switched across a total of three or more bands for the multiple antenna ports, a receiving unit that receives capability information related to a band in which downlink communication interruption occurs during switching from the terminal; a transmitting unit that transmits control information for scheduling uplink transmission to the terminal; A base station comprising: (Additional note 5) In a transmission switching method in which at least one antenna port among a plurality of antenna ports can switch bands across two or more bands, and the bands used for transmission are switched across a total of three or more bands for the plurality of antenna ports, reporting capability information regarding a band in which downlink communication interruption occurs during switching to a base station; receiving control information for scheduling uplink transmission from the base station; The communication method implemented by the device.

[0153] Any of the above items 1 to 5 provides a technique that enables a wireless communication system to appropriately switch the band used for uplink transmission. According to supplementary item 2, information regarding downlink communication interruption can be reported in various units. According to supplementary item 3, information regarding downlink communication interruption can be reported efficiently.

[0154] <Appendix 5> (Additional note 1) In a transmission switching method in which at least one antenna port among a plurality of antenna ports can switch bands across two or more bands, and a band used for transmission is switched across a total of three or more bands for the plurality of antenna ports, a transmitter that reports capability information indicating a switching time required for switching between bands to a base station; a receiving unit that receives, from the base station, information about a cell in which the switching time occurs; A terminal comprising: (Additional note 2) The transmitter reports the capability information indicating a switching time to the base station for each combination of bands to be switched within a band combination, for each band, for all combinations of bands within a band combination, or for all supported band combinations. A terminal as described in appendix 1. (Additional note 3) The receiving unit receives information about a cell in which the switching time occurs for each combination of serving cells, for each serving cell, or for each cell group. A terminal as described in appendix 1 or 2. (Additional note 4) In a transmission switching method in which at least one antenna port of a terminal can switch bands across two or more bands, and a band used for transmission is switched across a total of three or more bands for the multiple antenna ports, a receiving unit that receives capability information indicating a switching time required for switching between bands from the terminal; a transmitting unit that transmits information about a cell in which the switching time occurs to the terminal; A base station comprising: (Additional note 5) In a transmission switching method in which at least one antenna port among a plurality of antenna ports can switch bands across two or more bands and the bands used for transmission are switched across a total of three or more bands for the plurality of antenna ports, reporting capability information indicating a switching time required for switching between bands to a base station; receiving, from the base station, information about a cell in which the switching time occurs; The way the device runs.

[0155] Any of the above items 1 to 5 provides a technique that enables a band used for uplink transmission to be appropriately switched in a wireless communication system. According to Supplementary Item 2, capability information indicating the switching time can be reported in various units. According to Supplementary Item 3, information related to the switching time can be set in various units.

[0156] <Appendix 6> (Additional note 1) In a transmission switching method in which at least one antenna port among a plurality of antenna ports can switch bands across two or more bands, and a band used for transmission is switched across a total of three or more bands for the plurality of antenna ports, a transmitter that reports capability information indicating whether simultaneous transmission between the bands is possible to a base station; a receiving unit that receives information about cells that may perform simultaneous transmission from the base station; A terminal comprising: (Additional note 2) The transmitter reports to the base station the capability information indicating whether simultaneous transmission is possible for each combination of bands to be switched within the band combination, for each band, for all combinations of bands within the band combination, or for all supported band combinations. A terminal as described in appendix 1. (Additional note 3) The receiving unit receives information about cells that may perform simultaneous transmission for each combination of serving cells, each serving cell, or each cell group. A terminal as described in appendix 1 or 2. (Additional note 4) In a transmission switching method in which at least one antenna port of a terminal can switch bands across two or more bands, and the bands used for transmission are switched across a total of three or more bands for the multiple antenna ports, a receiving unit that receives capability information indicating whether simultaneous transmission between bands is possible from the terminal; a transmitting unit that transmits information about cells that may perform simultaneous transmission to the terminal; A base station comprising: (Additional note 5) In a transmission switching method in which at least one antenna port among a plurality of antenna ports can switch bands across two or more bands and the bands used for transmission are switched across a total of three or more bands for the plurality of antenna ports, reporting capability information indicating whether simultaneous transmission between the bands is possible to a base station; Receive information about cells that may perform simultaneous transmission from the base station. The communication method implemented by the device.

[0157] Any of the above items 1 to 5 provides a technique that enables a band used for uplink transmission to be appropriately switched in a wireless communication system. According to Supplementary Item 2, capability information indicating whether simultaneous transmission is possible in various units can be reported. According to Supplementary Item 3, various pieces of information regarding simultaneous transmission can be set.

[0158] (Hardware configuration) The block diagrams (FIGS. 20 and 21) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining the single device or the multiple devices with software.

[0159] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocation, 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.

[0160] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 22 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0161] In the following description, the term "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0162] Each function in the base station 10 and the terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0163] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0164] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 20 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 21 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0165] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0166] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0167] 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, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0168] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0169] Furthermore, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0170] Furthermore, base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

[0171] Furthermore, the terminal 20 or the base station 10 may be provided in the vehicle 2001. FIG. 23 shows a configuration example of the vehicle 2001. As shown in FIG. 23, 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. The functions of the terminal 20 may be mounted on the communication module 2013.

[0172] 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.

[0173] 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).

[0174] 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.

[0175] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing various types of information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 uses information obtained from external devices via the communication module 2013, etc., to provide various types of multimedia information and multimedia services to the occupants of the vehicle 2001.

[0176] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driver's driving burden, such as a millimeter-wave radar, a LiDAR (Light Detection and Ranging), a camera, a positioning locator (e.g., GNSS, etc.), map information (e.g., high-definition (HD) map, autonomous vehicle (AV) map, etc.), a gyro system (e.g., an IMU (Inertial Measurement Unit), an INS (Inertial Navigation System), etc.), an AI (Artificial Intelligence) chip, and an AI processor, as well as one or more ECUs that control these devices. The driving assistance system unit 2030 also transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0177] 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.

[0178] 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.

[0179] The communication module 2013 transmits, via wireless communication to an external device, a current signal from the current sensor that is input to the electronic control unit 2010. The communication module 2013 also transmits, via wireless communication to an external device, the rotation speed signals of the front and rear wheels acquired by a rotation speed sensor 2022, the air pressure signals of the front and rear wheels acquired by an air pressure sensor 2023, the vehicle speed signal acquired by a vehicle speed sensor 2024, the acceleration signal acquired by an acceleration sensor 2025, the accelerator pedal depression amount signal acquired by an accelerator pedal sensor 2029, the brake pedal depression amount signal acquired by a brake pedal sensor 2026, the shift lever operation signal acquired by a shift lever sensor 2027, and the detection signals for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028, which are input to the electronic control unit 2010.

[0180] The communication module 2013 receives various information (traffic information, traffic signal information, inter-vehicle information, etc.) transmitted from external devices and displays it on an information service unit 2012 provided in the vehicle 2001. The communication module 2013 also stores the various information received from the external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.

[0181] (Supplementary explanation of the embodiment) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention; two or more items may be combined as needed, and items described in one item may apply to items described in another item (unless inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of the processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station 10 and terminal 20 have been described using functional block diagrams. However, such devices may be implemented using hardware, software, or a combination thereof. The software operated by the processor of the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor of the terminal 20 in accordance with an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

[0182] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0183] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), 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 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or other appropriate systems, and next-generation systems extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

[0184] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0185] In this specification, a specific operation that is described as being performed by the base station 10 may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0186] The information or signals described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0187] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0188] In the present disclosure, the determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0189] 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.

[0190] 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.

[0191] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0192] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0193] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0194] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0195] 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.

[0196] In this disclosure, terms such as "base station (BS)," "radio base station," "base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0197] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0198] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0199] 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.

[0200] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, or the mobile body itself. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0201] Furthermore, a base station in the present disclosure may be read as a terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a terminal is replaced with communication between a plurality of terminals 20 (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to 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.

[0202] Similarly, the term "terminal" in the present disclosure may be read as "base station." In this case, the base station may be configured to have the functions of the terminal described above.

[0203] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0204] 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.

[0205] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0206] 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."

[0207] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0208] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0209] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0210] 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.

[0211] Numerology may be communication parameters that apply to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0212] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0213] 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.

[0214] 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.

[0215] 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, or the like instead of a subframe. Furthermore, one slot may be called a unit time. The unit time may differ for each cell depending on the numerology.

[0216] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0217] 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.

[0218] 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.

[0219] 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.

[0220] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0221] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0222] 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.

[0223] 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, or the like.

[0224] 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.

[0225] 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 given BWP and numbered within that BWP.

[0226] 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.

[0227] 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."

[0228] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0229] 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.

[0230] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0231] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0232] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0233] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 terminals 210 Transmitter 220 Receiving unit 230 Setting Section 240 Control Unit 1001 processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication equipment 1005 Input Device 1006 Output Device 2001 Vehicle 2002 Drive unit 2003 Steering Section 2004 accelerator pedal 2005 brake pedal 2006 Shift Lever 2007 front wheel 2008 rear wheel 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 RPM Sensor 2023 Air Pressure Sensor 2024 Vehicle speed sensor 2025 Acceleration Sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object Detection Sensor 2029 Accelerator pedal sensor 2030 Driving Assistance Systems Department 2031 microprocessor 2032 memory (ROM, RAM) 2033 Communication port (IO port)

Claims

1. In a transmission switching method in which at least one antenna port among a plurality of antenna ports can switch bands across N or more bands (N>1, N is an integer), and a band used for transmission is switched across M or more bands (M>N, M is an integer) in total for the plurality of antenna ports, the method comprising: a transmitter that reports capability information indicating a switching time required for switching between bands to a base station; a receiving unit that receives information about a cell in which the switching time occurs from the base station; Equipped with The transmitter transmits a value indicating a switching time required for switching between the bands for each band combination among a plurality of band combinations supported for the transmission switching scheme. Terminal.

2. The switching time required for switching between the bands includes the switching time required for switching between the bands when each of the two antenna ports of the terminal switches bands. The terminal according to claim 1 .

3. A plurality of candidate values ​​for the switching time are defined for the transmission switching method. The terminal according to claim 1 .

4. In a transmission switching method in which at least one antenna port of a terminal can switch bands across N or more bands (N>1, N is an integer), and a band used for transmission is switched across M or more bands (M>N, M is an integer) in total for the multiple antenna ports, the method comprising: a receiving unit that receives capability information indicating a switching time required for switching between bands from the terminal; a transmitting unit that transmits information about a cell in which the switching time occurs to the terminal; Equipped with The receiving unit receives from the terminal a value indicating a switching time required for switching between the bands for each band combination among a plurality of band combinations supported for the transmission switching scheme. Base station.

5. In a transmission switching method in which at least one antenna port among a plurality of antenna ports can switch bands across N or more bands (N>1, N is an integer), and the bands used for transmission are switched across M or more bands (M>N, M is an integer) in total for the plurality of antenna ports, reporting capability information indicating a switching time required for switching between bands to a base station; receiving, from the base station, information about a cell in which the switching time occurs; transmitting a value indicating a switching time required for switching between the bands for each band combination among a plurality of band combinations supported for the transmission switching method; The communication method implemented by the device.

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