Terminal, base station, and communication method

Abstract

The terminal has a transmission section that performs uplink transmission using N (N is a natural number of M or less) bands selected from M (M is a natural number of 3 or more) bands, and a control section that reports capability information about a minimum interval of switching of two times of uplink transmission in a case where the switching of the two times of uplink transmission is performed in two continuous time slots, the control section reporting, as the capability information, information indicating whether or not a specific value or more of an interval is not required as the minimum interval of the switching of the two times of uplink transmission.

Description

Technical Field

[0001] This disclosure relates to terminals, base stations, and communication methods in wireless communication systems. Background Technology

[0002] The 3rd Generation Partnership Project (3GPP, registered trademark) standardized Long Term Evolution (LTE) and the 5th generation mobile communication system (also known as 5G, New Radio (NR), or Next Generation (NG)), as well as the next generation, known as Beyond 5G, 5G Evolution, or 6G.

[0003] Furthermore, in 3GPP Release 18, the following mechanism was studied: as a band field that can be used in uplink (UL) transmission, it is possible to set 3 or 4 band fields, and support simultaneous transmission using up to 2 band fields (UL Tx switching schemes across up to 3 or 4 bands with restriction of up to 2 Tx simultaneous transmission) (Non-Patent Document 1).

[0004] Furthermore, regarding such UL Tx switching, from the perspective of reducing the implementation load and complexity of the terminal (User Equipment, UE), the minimum separation time for specifying the minimum interval of UL transmission during switching between band domains was studied (Non-Patent Document 2).

[0005] Existing technical documents

[0006] Non-patent literature

[0007] Non-patent literature 1: “New WID on Multi-carrier enhancements”, RP-213577, 3GPPTSG RAN Meeting #94e, 3GPP, December 2021

[0008] Non-patent document 2: “Draft Report of 3GPP TSG RAN WG1 #110bis-e v0.1.0”, 3GPP, October 2022 Summary of the Invention

[0009] Additionally, when two UL transmissions are performed within two consecutive time slots, Minimum Separation Time is the minimum interval between the first and second UL transmission handovers. Minimum Separation Time is the larger of the UE capability reported by the user equipment (UE) and the handover period / switching gap for one UL transmission.

[0010] Against the backdrop described above, the inventors conducted in-depth research and found that the UE's actions were ambiguous when a value smaller than the switching period / switching gap (e.g., "0 μs") was reported as a UE capability, or when the UE did not report its capabilities.

[0011] Therefore, the following disclosure is made in view of the situation and its purpose is to provide a terminal, base station and communication method that can properly perform UL Tx switching (uplink transmission switching) even when the number of band fields that can be used for UL transmission increases.

[0012] One disclosed embodiment is a terminal comprising: a transmitting unit that performs uplink transmission using N (N is a natural number less than M) bands selected from M (M is a natural number greater than or equal to 3) bands; and a control unit that, when performing two uplink transmission handovers in two consecutive time slots, reports capability information related to the minimum interval between the two uplink transmission handovers, wherein the control unit reports the capability information as information indicating whether an interval greater than a specific value is not required as the minimum interval between the two uplink transmission handovers.

[0013] One disclosed embodiment is a base station comprising: a receiving unit that performs uplink reception using N (N is a natural number less than M) bands selected from M (M is a natural number greater than or equal to 3) bands; and a control unit that envisions, in the event of performing two uplink transmission handovers in two consecutive time slots, a terminal reporting capability information related to the minimum interval between the two uplink transmission handovers, wherein the control unit envisions the terminal reporting the capability information as information indicating whether an interval greater than a specific value is not required as the minimum interval between the two uplink transmission handovers.

[0014] One disclosed approach is a communication method comprising: step A, performing uplink transmission using N (N is a natural number less than M) bands selected from M (M is a natural number greater than 3) bands; and step B, in the case of performing two uplink transmission handovers in two consecutive time slots, reporting capability information related to the minimum interval between the two uplink transmission handovers, wherein step B includes the following step: reporting the capability information as information indicating whether an interval greater than a specific value is not required as the minimum interval between the two uplink transmission handovers. Attached Figure Description

[0015] Figure 1 This is a diagram used to illustrate the wireless communication system in an embodiment of the present invention.

[0016] Figure 2 This is a diagram used to illustrate the wireless communication system in an embodiment of the present invention.

[0017] Figure 3 This is a diagram illustrating scenarios 1 and 2 in UL Tx switching (uplink transmission switching).

[0018] Figure 4 This is a diagram illustrating the structural examples of the antenna ports used in transmission for each scenario in UL Tx switching.

[0019] Figure 5 This is a diagram illustrating the structural examples of the antenna ports used in transmission for each scenario in UL Tx switching.

[0020] Figure 6 This is a diagram illustrating an example of UE capability.

[0021] Figure 7 This is a diagram illustrating an example of RRC configuration.

[0022] Figure 8This is a diagram illustrating an example of a switching period.

[0023] Figure 9 This is a diagram illustrating an example of a switching period.

[0024] Figure 10 This is a diagram illustrating an example of the length of a DL interruption (downlink communication interruption).

[0025] Figure 11 This is a diagram showing cases 1 to 3 in UL Tx switching.

[0026] Figure 12 This is a diagram illustrating the structural examples of the antenna ports used in transmission for each scenario in UL Tx switching.

[0027] Figure 13 This is a diagram illustrating an example of an RRC configuration.

[0028] Figure 14 This is a diagram illustrating an example of a scenario where multiple carriers are contained within a single band domain in UL Tx switching.

[0029] Figure 15 This is a diagram illustrating the structural examples of the antenna ports used in transmission for each scenario in UL Tx switching.

[0030] Figure 16 This is a diagram illustrating the structural examples of the antenna ports used in transmission for each scenario in UL Tx switching.

[0031] Figure 17 This is a diagram illustrating a structural example when switching across four band domains.

[0032] Figure 18 This is a diagram illustrating an example of the antenna port structure used in transmission when switching across four bands.

[0033] Figure 19 This is a diagram illustrating a basic example of the implementation method.

[0034] Figure 20 This is a diagram showing an example of the setting for Minimum Separation Time.

[0035] Figure 21 This is a diagram used to illustrate the fourth embodiment.

[0036] Figure 22This is a diagram used to illustrate the fourth embodiment.

[0037] Figure 23 This is a diagram illustrating a structural example of base station 10.

[0038] Figure 24 This is a diagram illustrating a structural example of terminal 20.

[0039] Figure 25 This is a diagram illustrating an example of the hardware structure of a base station 10 or a terminal 20 in an embodiment of the present invention.

[0040] Figure 26 This is a diagram illustrating an example of vehicle structure. Detailed Implementation

[0041] The embodiments are described below with reference to the accompanying drawings. Furthermore, the same or similar reference numerals are used to denote the same function and structure, and their descriptions are omitted where appropriate.

[0042] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, the embodiments described below are merely examples, and the application of the present invention is not limited to the embodiments described below.

[0043] In the operation of the wireless communication system according to embodiments of the present invention, existing technologies are appropriately used. These existing technologies include, for example, existing LTE or existing NR, but are not limited to, existing LTE and NR.

[0044] Furthermore, in the embodiments of the present invention described below, the terms SS (Synchronization Signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), and PUSCH (Physical Uplink Shared Channel) used in conventional LTE or NR are used. These are for ease of description, and the same signals, functions, etc., can also be referred to by other names. In addition, the above terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even signals used in NR are not necessarily explicitly written as "NR-".

[0045] Furthermore, in embodiments of the present invention, the duplex mode can be TDD (Time Division Duplex), FDD (Frequency Division Duplex), or other modes (e.g., Flexible Duplex).

[0046] Furthermore, in embodiments of the present invention, the “configure” wireless parameters can be pre-configured predetermined values ​​or wireless parameters notified from the base station 10 or the terminal 20.

[0047] Figure 1 This is a diagram illustrating a structural example (1) of a wireless communication system according to an embodiment of the present invention. Figure 1 As shown, the wireless communication system in this embodiment of the invention includes a base station 10 and a terminal 20. Figure 1 The image shows one base station 10 and one terminal 20, but this is just one example; there can be multiple terminals.

[0048] Base station 10 is a communication device that provides one or more cells and wirelessly communicates with terminal 20. The physical resources of the wireless signal are defined in the time and frequency domains. The time domain can be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain can be defined by the number of subcarriers or resource blocks. Base station 10 sends synchronization signals and system information to terminal 20. Synchronization signals are, for example, NR-PSS and NR-SSS. System information is transmitted, for example, via NR-PBCH, also known as broadcast information. Synchronization signals and system information can also be referred to as SSB (SS / PBCH block). Figure 1 As shown, base station 10 sends control signals or data to terminal 20 via DL (Downlink) and receives control signals or data from terminal 20 via UL (Uplink). Both base station 10 and terminal 20 are capable of beamforming for signal transmission and reception. Furthermore, both base station 10 and terminal 20 can apply MIMO (Multiple Input Multiple Output) based communication to DL or UL. Additionally, base station 10 and terminal 20 can also communicate via CA (Carrier Aggregation) based secondary cells (SCell) and primary cells (PCell). Moreover, terminal 20 can also communicate via DC (Dual Connectivity) based primary cells of base station 10 and primary SCG cells of other base stations 10.

[0049] Terminal 20 is a communication device with wireless communication capabilities, such as a smartphone, mobile phone, tablet computer, wearable terminal, or M2M (Machine-to-Machine) communication module. Figure 1 As shown, terminal 20 receives control signals or data from base station 10 via DL and transmits control signals or data to base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. Furthermore, terminal 20 receives various reference signals transmitted from base station 10 and performs propagation path quality measurements based on the reception results of these reference signals.

[0050] Terminal 20 is capable of carrier aggregation, which bundles 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. Alternatively, a PUCCH SCell with a PUCCH can also be used.

[0051] Figure 2 This is a diagram illustrating an example (2) of a wireless communication system in an embodiment of the present invention. Figure 2 This illustrates an example of the structure of a wireless communication system implementing DC (Dual connectivity). Figure 2 As shown, the system includes a base station 10A acting as the Master Node (MN) and a base station 10B acting as the Secondary Node (SN). Base stations 10A and 10B are connected to the core network. Terminal 20 can communicate with both base stations 10A and 10B.

[0052] The cell group provided by base station 10A, which acts as the MN, is called the MCG (Master Cell Group), and the cell group provided by base station 10B, which acts as the SN, is called the SCG (Secondary Cell Group). Furthermore, in the DC, the MCG consists of one PCell and one or more SCells, and the SCG consists of one PSCell (Primary SCG Cell) and one or more SCells.

[0053] The processing action in this embodiment can be achieved through... Figure 1 The system architecture shown can be used to execute this, or it can be done through... Figure 2 The system architecture shown can be used for execution, but it can also be used through other system architectures.

[0054] Within 3GPP, research has been conducted on enhanced multi-carrier operations. Specifically, research is underway on the operation of dynamically switching UL transmission bands across three or four bands for up to two terminals simultaneously transmitting in FR1 (Frequency Range 1). Additionally, in the following descriptions, "carrier," "CC," and "cell" are sometimes used synonymously.

[0055] (Regarding the research topic)

[0056] In existing technologies (Rel-16, Rel-17), terminal 20 supports the function of switching UL transmission between two bands (two carriers), namely the UL Tx switching function (uplink transmission switching function). Even terminal 20 with only two transmission chains (Tx Chains) can switch the following actions in time by using the UL Tx switching function: transmitting through two antenna ports on one carrier, or using one antenna port on one carrier and another antenna port on the other carrier.

[0057] Additionally, the transmission chain (also known as Tx Chain, transmission system, etc.) is a physical function in terminal 20 used for transmission, independent of whether actual transmission occurs. Transmission on a single carrier can be performed through a transmission chain. By switching the carrier used by the transmission chain (the corresponding transmission function unit), the carrier that can be transmitted through the transmission chain can be switched.

[0058] An antenna port is an antenna that can actually transmit using a transmit chain (Tx Chain). Sometimes the terms transmit chain and antenna port are used interchangeably. Alternatively, "antenna port" can also be referred to simply as "port".

[0059] In the following description, unless otherwise specified, a band has one carrier. Therefore, in this specification and claims, "band" can be replaced with "carrier," and vice versa. However, a band having one carrier is an example; a band can also have multiple carriers. In the case of multiple carriers within a band, their number and relationship can be limited, for example, they can be limited to two consecutive carriers in frequency. Multiple carriers within a band can be treated in the same way as one UL band (carrier) in the following description.

[0060] In 3GPP, research is underway on "UL Tx switching schemes across up to 3 or 4 bands with restriction of up to 2 Tx simultaneous transmission for FR1 UEs". For convenience, this function can also be referred to as "Rel-18 UL Tx switching".

[0061] The above-mentioned functions are as follows: to set 3 or 4 UL bands (carriers) for terminals that cannot perform UL CA (Carrier Aggregation) or can only perform 2 UL CAs, and to dynamically instruct the base station 10 to transmit in 1 or 2 of the UL bands (carriers).

[0062] This functionality allows for consideration of service conditions or TDD configurations across multiple UL bands (carriers), instructing terminal 20 to use UL transmissions with UL bands (carriers) suitable for use in various time resources. This improves frequency utilization efficiency and UL throughput.

[0063] In Rel-16 and Rel-17, UL Tx switching between two band domains is standardized. However, in Rel-18 ULTx switching, it is unclear how to set the UL band (carrier) as a switching candidate in terminal 20.

[0064] Previously, for a terminal 20 supporting UL CA, multiple DL / UL carriers could be configured as serving cells up to the number of CCs supported by the UL CA, and the UL CCs used for transmission could be dynamically indicated within them. However, in Rel-18 UL Txswitching, it is necessary to configure a number of UL carriers that is greater than the number of CCs supported by the UL CA. However, the prior art does not envision configuring a number of UL CCs exceeding the supported number.

[0065] As another existing technology, there is SUL (supplementary uplink). The SUL framework supports association and dynamic switching with NUL (normal uplink), but there is no plan to extend the SUL framework.

[0066] The following sections first describe the UL Tx switching for Rel-16 and R-17 respectively. Then, they describe the capabilities and configuration information for Rel-18 UL Tx switching. However, the capabilities and configuration information specified for UL Tx switching in Rel-16 and R-17 can also be applied to Rel-18 UL Tx switching.

[0067] Furthermore, the power boosting, switching period, and DL interruption that describe UL Tx switching for Rel-16 and R-17 are essentially the same in Rel-18 UL Tx switching as Rel-16 and R-17.

[0068] (UL Tx switching of Rel-16)

[0069] In Rel-16, terminal 20 corresponds to two carriers and has two transmission chains. One transmission chain is fixed to one carrier, while the other transmission chain can be switched to correspond to either of the two carriers. Therefore, for example, simultaneous transmission based on two antenna ports is possible on a single carrier. Each antenna port can also transmit on one carrier and one antenna port. These modes can be dynamically switched. The UL Tx switching in Rel-16 is referred to as Rel-16 1Tx-2Tx switching.

[0070] like Figure 3 As shown, the structure where each transmission chain corresponds to one carrier is called Case 1, and the structure where two transmission chains correspond to one carrier is called Case 2.

[0071] Figure 4 This indicates the structure of the transmission chain used for transmission in SUL, specifically for cases 1 and 2. For example, 1T+1T in case 1 refers to... Figure 3 In the example, carrier 2 is connected to transmission chain 1, and carrier 1 is connected to transmission chain 2.

[0072] Furthermore, in the 1T+1T state, 1P+0P refers to transmission based on carrier 1 occurring at antenna port 2, but no transmission occurring at antenna port 1. In SUL, two carriers cannot be set simultaneously, therefore 1P+1P does not exist. Additionally, in SUL case 1, it is not assumed that only NUL (carrier 2) will be transmitted, therefore 0P+1P does not exist.

[0073] Furthermore, "0P+2P, 0P+1P" in scenario 2 refers to transmitting using carrier 2 in both antenna port 1 and antenna port 2, or transmitting based on carrier 2 only in antenna port 1.

[0074] In Rel-16 1Tx-2Tx switching within inter-band CA / EN-DC, there are Option 1, which cannot use two carriers simultaneously, and Option 2, which can use two carriers simultaneously. The transmit chain structure used in Option 1 is different from... Figure 4 The structure shown is the same. The transmission chain structure used in option 2 is as follows: Figure 5 As shown.

[0075] Figure 6 The example shown is a UE capability reported from terminal 20 to base station 10, as specified in Rel-16 1Tx-2Tx switching. Figure 7 This represents an example of CellGroupConfig and ServingCellConfig set from base station 10 to terminal 20, as specified in Rel-16 1Tx-2Tx switching.

[0076] In ServingCellConfig, uplinkTxSwitchingPeriodLocation-r16 indicates whether the UL Tx switching period (uplink transmission switching period) is set in the target cell (carrier). Figure 8 and Figure 9 Examples of actions related to the ULTx switching period are shown. Figure 8 This is an example of a scenario where a UL Tx switching period is generated in carrier 1. In this case, a UL Tx switching period is generated in carrier 1 in either the case of switching from carrier 1 to carrier 2 or the case of switching from carrier 2 to carrier 1. For example, Figure 8 In the case where transmission has been performed via carrier 1, and an instruction to switch to carrier 2 is received, transmission on carrier 2 will proceed after the switching time (switching period) based on carrier 1. Figure 9 This is an example of a scenario where a ULTxswitching period is generated in carrier 2.

[0077] During dynamic handover between two carriers, terminal 20 allows a predetermined length of DL communication interruption (DL interruption) in the DL carrier for the portion overlapping with the UL switching period. Its length (X OFDM symbols) is as follows: Figure 10 As specified in the diagram.

[0078] The UL Tx switching of Rel-16 is summarized as follows. Terminal 20 can dynamically switch between "port 1 transmission on carrier 1", "port 1 transmission on carrier 2", "port 1 transmission on carrier 1 + port 1 transmission on carrier 2" (only applicable if option 2 is supported in inter-band CA) and "port 2 transmission on carrier 2 (with or without 3dB power boosting)" based on PUSCH scheduling (scheduling command, rank adaptation) from base station 10.

[0079] A switching period occurs when the carrier connected to the transmit port is switched. During the switching period, UL transmission is not performed on either carrier. Additionally, there are cases where DL interruptions occur during the switching period.

[0080] <rel-17>

[0081] Next, Rel-17 is explained. In Rel-17, 2 transmission chains can correspond to 2 carriers respectively, and thus 2Tx-2Tx UL Tx switching is made. In Carrier 1, 2-port transmission is also possible, and thus as the connection mode of the transmission chain and the carrier, in addition to Case 1 and Case 2, Case 3 is added as shown in Figure 11 Thus, for the terminal 20 and the base station 10, it is necessary to distinguish between Rel-17 (2Tx-2Tx UL Tx switching) and Rel-16 (1Tx-2Tx).

[0082] In Rel-17 (2Tx-2Tx UL Tx switching), the mode of the number of transmission ports in each case is as shown in Figure 12 In Figure 12 , the mode of the number of transmission ports in each case and each option (whether 2-carrier simultaneous transmission is possible) is shown.

[0083] Here, for example, for the terminal 20 that performs UL CA Option 2, in the case where 1P+0P is indicated in the state of Case 2, or in the case where 0P+1P is indicated in the state of Case 3, the terminal 20 needs to decide which of the remaining two cases to switch to.

[0084] Figure 13 An example of RRC configuration in Rel-17 is shown. In Figure 13 , UplinkTxSwitching-2T-Mode-r17 indicates the setting of the mode to become 2Tx-2Tx UL Tx switching, and UplinkTxSwitching-DualUL-TxState-r17, as described above, is information that sets which case to switch to in the case where there are multiple candidates for which case to switch to at the time of switching.

[0085] Further, in Rel-17 UL Tx switching, as shown in Figure 14 , the number of bands is 2, but the use of 2 contiguous carriers in one of them is supported. Figure 15 and Figure 16 An example of the structure of the transmission port in each case in Figure 14 is shown.

[0086] The functions, setting values, and specified values, etc. of Rel-16 and R-17 explained above can also be applied to Rel-18 UL Tx switching.

[0087] (Rel-18 UL Tx switching)

[0088] Figure 17 as well as Figure 18 This describes the scenarios envisioned in Rel-18 UL Tx switching and the structure of the ports used for transmission in each scenario. Here, as an example, the bands that can be used for UL Tx switching are defined as bands A to B.

[0089] like Figure 17 As shown, there are two transmit chains (two antenna ports), each capable of switching to any one of the bands A through D. This is denoted as "2Tx-2Tx(-2Tx-2Tx) switching". When assuming one carrier is available in each band, as... Figure 18 As shown, the maximum number of cases is 10 (assuming the case of option CA 2).

[0090] In addition to the above assumptions, we also consider the case where the bandwidth (carrier) available to a port is fixed at 1Tx-2Tx (-1Tx-1Tx) switching.

[0091] Furthermore, such as Figure 14 As shown, the case of having two consecutive carriers in a portion of the band (or more than five carriers in total) is also considered.

[0092] Regarding the Rel-18 UL Tx switching as envisioned above, since there is no prior art regarding the capability report from terminal 20 to base station 10 and the setting / instruction from base station 10 to terminal 20, it is possible that "UL Tx switching schemes across up to 3 or 4 bands with restriction of up to 2 Tx simultaneous transmission" cannot be properly implemented in the prior art.

[0093] Therefore, in this embodiment, the capability report and settings / instructions for appropriately implementing "UL Tx switching schemes across up to 3 or 4 bands with restriction of up to 2 Tx simultaneous transmission" are explained.

[0094] Furthermore, in this embodiment, "UL Tx switching schemes across up to 3 or 4 bands with restriction of up to 2 Tx simultaneous transmission" are envisioned, but this is just one example. The maximum number of bands for the transmission switching range can also be greater than 4. In addition, the number of antenna ports used in transmission can also be greater than 2. That is, there can also be cases where simultaneous transmission occurs at more than 3 antenna ports.

[0095] (Summary of the implementation method)

[0096] This implementation method includes three embodiments, namely, Embodiment 1 and Embodiment 3. (Refer to...) Figure 19 Hereinafter, we will explain the basic operation examples common to the first embodiment A through the third embodiment.

[0097] In S101, terminal 20 sends capability information to base station 10. An example of capability information is described in the first embodiment. In S102, base station 10 sends configuration information (or indication information) to terminal 20. An example of configuration information / indication information is described in the second embodiment.

[0098] Furthermore, within the range of the capabilities of terminal 20 shown in the capability information of terminal 20 received in S101, base station 10 determines the setting / instruction content for terminal 20, generates setting information / instruction information, and sends it in S102. However, this concept is just one example.

[0099] In S102, the terminal 20, which receives the setting information / instruction information, performs an action according to the information. In S103, when the terminal 20 receives the DCI from the base station 10, for example, according to the setting information, it switches the band domain connected to the port based on the DCI, and in S104, it transmits using the switched port.

[0100] The transmission of setting / instruction information in S102 can be performed via any one of RRC signaling, MAC CE, or DCI. The outlines of the first and second embodiments are described below.

[0101] <Summary of the First Embodiment>

[0102] As part of its support for Rel-18 UL Tx switching, terminal 20 reports at least one of the following types of capability information to base station 10. The examples listed below are all examples of capability information related to the band domain.

[0103] • Supported UL Tx switching with band field combinations (e.g., up to 3 or 4 band fields).

[0104] • The number of CCs that can be supported in each band domain

[0105] • Are associated DL carriers (downlink carriers) required in each band domain?

[0106] • For each combination of bands to be switched, {whether simultaneous transmission is supported, switching period, band that caused DL interruption, and whether power boosting is supported}.

[0107] • Ability to switch the number of ports with domains

[0108] • The band field is a fixed port of the object band field

[0109] • Candidate bands for switching on each port

[0110] <Summary of the Second Embodiment>

[0111] Terminal 20 receives at least one of the following sets of configuration / instruction information from base station 10 as configuration / instruction information for Rel-18 UL Tx switching. In other words, base station 10 sends at least one of the following sets of configuration / instruction information to terminal 20. The examples listed below are all examples of information related to band domain switching.

[0112] • Includes UL's DL / UL serving cell (DL / UL serving cell) and UL only serving cell (UL only serving cell) for Rel-18 UL Tx switching (or either DL / UL serving cell or UL only serving cell).

[0113] • Other serving cells that can be instructed to handover and / or simultaneously transmit within each serving cell.

[0114] • In each serving cell, the interpretation depends on each combination with other serving cells {whether a switching period is included, whether power boosting is possible, whether simultaneous transmission is possible, and whether a handover from a specific port structure to another specific port structure is indicated}.

[0115] • Number of ports for domain switching objects

[0116] • Whether each serving cell is associated with a port of the domain handover object (or non-handover object).

[0117] Hereinafter, the first embodiment and the second embodiment will be described in detail. Examples 1 to 9 of the first embodiment can be implemented in any combination with any of Examples 1 to 9 of the second embodiment.

[0118] (First Embodiment)

[0119] In the first embodiment, the terminal 20 reports at least one of the capability information shown in Examples 1 to 9 below to the base station. Alternatively, it may report information that is a combination of any number or all of Examples 1 to 9.

[0120] <Example 1>

[0121] Terminal 20 reports one or more information related to band domain combination (BC) for UL Tx switching supported by Rel-18 UL Tx switching to base station 10 separately from UL CA using BC.

[0122] The reported UL Tx switching band field combination (BC) may include BCs that do not support UL CA. Each BC included in one or more band field combinations (BCs) for ULTx switching may be information representing a combination of band fields to be switched.

[0123] For example, if terminal 20 reports BC1, BC2, and BC3 as BCs for UL CA, terminal 20 may also report BC4 and BC5 as band domain combinations (BCs) for UL Tx switching.

[0124] In addition, as a variation, the following limitation may also exist: each BC included in one or more band field combinations (BCs) used for the reported UL Tx switching needs to be a UL CA-supporting BC.

[0125] Furthermore, as another variation, the following limitation may also exist: When reporting the BC for UL Tx switching in Rel-18, the capabilities specified in Rel-16 / 17 must be reported for each band domain combination within the BC. In this case, for example, when reporting the BC for band domain ABC in Rel-18, the capabilities specified in Rel-16 / 17 must be reported for AB, AC, and BC.

[0126] Furthermore, as another variation, the following limitation may exist: when reporting the BC for UL Tx switching in Rel-18, it is necessary to support each "band field combination" within the BC. In this case, for example, when reporting the BC for band field ABC in Rel-18, it is also necessary to support AB, AC, and BC.

[0127] <Example 2>

[0128] Terminal 20 reports information related to the number of CCs supported in each band of the BC used for UL Tx switching as described in Example 1 to base station 10. The information related to the number of CCs can also be the number of CCs (cell number) itself. In addition, the band in Example 2 (the band in which the number of CCs is reported) can also be a band outside the band in the BC reported in Example 1.

[0129] Furthermore, the specification can also define the upper limit of the number of CCs or the total bandwidth that each band can support in Rel-18 UL Tx switching. For example, regarding the number of CCs that terminal 20 can support in each band, it can be specified as "a maximum of 2 consecutive CCs" or "consecutive CCs within a 100MHz band." Moreover, the upper limit of the number of CCs that can be supported or the total bandwidth can be specified separately for TDD and FDD, not for each band. For example, base station 10 sets the CCs for terminal 20 within the band used for UL Tx switching according to these specifications.

[0130] <Example 3>

[0131] Terminal 20 reports information to base station 10 regarding whether a DL carrier associated with each band of the BC used for UL Tx switching, as described in Example 1, is required for that band. For example, if there are bands A, B, and C for a certain BC, it reports information such as {Band A: DL carrier required, Band B: DL carrier not required, Band C: DL carrier not required} for that BC. Furthermore, as a terminal 20, it is basically only necessary to be able to receive DL data via any one carrier, so a DL carrier may not be required in a certain band.

[0132] In addition, the conditions for UL carriers / bands that do not require associated DL carriers can be specified in the specification. These conditions could include, for example, TDD (or FDD), a specific band, or the inclusion of a specific band only in the BC.

[0133] Alternatively, the band in Example 3 (the band that reports whether a DL carrier is needed) can also be a band outside the band within the BC reported in Example 1.

[0134] <Example 4>

[0135] Terminal 20 will simultaneously send a report to base station 10 with each band domain combination of the BC intra-band switching used for UL Tx switching as described in Example 1, indicating whether or not there is support.

[0136] For example, terminal 20 reports to base station 10 information such as that in BC of band ABCD, bands AB can be transmitted simultaneously (dual UL or Both), while AC and AD cannot be transmitted simultaneously (switched UL).

[0137] In addition, terminal 20 may also report information related to whether simultaneous transmission is supported for base station 10, not for each combination of the bands to be switched, but for all combinations within each band or BC, or for all BCs supported by terminal 20 for Rel-18 UL Tx switching.

[0138] Alternatively, the band field in Example 4 (the report simultaneously sends a band field that supports presence or absence) can also be a band field outside the band field within the BC reported in Example 1.

[0139] <Example 5>

[0140] Terminal 20 reports information related to the switching period of each combination of band domains switched within the BC for UL Tx switching as described in Example 1. The information related to the switching period may be the value of the switching period.

[0141] For example, terminal 20 reports to base station 10 information such as the switching period of band AB in band BC of band ABCD being n35μs, and that AC and AD being n140μs.

[0142] In addition, terminal 20 may also report information related to the switching period for base station 10, not for each combination of the bands to be switched, but for each band, or for all combinations within the aforementioned BC, or for all BCs supported by the terminal for Rel-18 UL Tx switching.

[0143] In addition, candidate values ​​for the switching period in the new Rel-18 UL Tx switching specification can be provided, or some values ​​that can be reported to Rel-16 / 17 can be set to not be reported to Rel-18.

[0144] Alternatively, the band field in Example 5 (the band field reporting the switching period) can also be a band field other than the band field within BC reported in Example 1.

[0145] <Example 6>

[0146] Terminal 20 can also report the generation of DL interruption bands for each band field of the BC intra-switching used in UL Tx switching as illustrated in Example 1.

[0147] For example, terminal 20 reports 0100 in band AB and 1010 in band AC in band BC of band ABCD for base station 10. This bitmap represents band ABCD, which refers to the DLinterruption that occurs when switching in the band corresponding to 1 bit.

[0148] In addition, terminal 20 may also report information related to the band that generated the DL interruption for base station 10, not for each combination of the bands to be switched, but for each band, or for all combinations within the aforementioned BC, or for all BCs supported by the terminal for Rel-18 UL Tx switching.

[0149] In addition, the specification may specify whether DL interruption is allowed for each band domain combination or each combination of 2 band domains within a band domain combination for Rel-18 UL Tx switching.

[0150] Additionally, the band field in Example 6 (the band field that reports the DL interruption) can be a band field other than the band field within the BC reported in Example 1.

[0151] In Example 6, when the base station 10 receives information indicating that a DL interruption has occurred in a certain band, it may also schedule the DL reception in that band, assuming that a DL interruption has occurred.

[0152] <Example 7>

[0153] Terminal 20 can also report information regarding whether there is support for power boosting for each combination of band domains used for BC switching in the UL Tx switching described in Example 1.

[0154] For example, terminal 20 reports to base station 10 that power boosting is possible in band BC of band ABCD, but not in band AB, and not in bands AC and AD. Being able to perform power boosting in band AB means, for example, that when terminal 20 performs port switching between bands AB and transmits through two ports in one band, the transmit power (output power) is increased. Alternatively, being able to perform power boosting in band AB could also mean increasing the transmit power (output power) when transmitting simultaneously in bands A and B.

[0155] In addition, terminal 20 can also report information about whether power boosting is supported for base station 10, not for each combination of the bands to be switched, but for all combinations within each band or BC, or for all BCs supported by the terminal for Rel-18 UL Tx switching.

[0156] Alternatively, the band field in Example 7 (the band field that reports whether power boosting is possible) can also be a band field outside the band field within BC reported in Example 1.

[0157] When a base station 10 receives information indicating that it can perform power boosting in a certain band, it can also perform transmit power control on the terminal 20 based on DCI or MAC CE to perform power boosting when scheduling simultaneous transmission on two ports in that band.

[0158] <Example 8>

[0159] Terminal 20 can also report information related to the number of ports (e.g., 1 or 2) capable of band domain switching within the BC used for UL Tx switching as described in Example 1 to base station 10. Furthermore, in cases where a port has a fixed band domain, the target band domain of the fixed port can also be reported. For example, terminal 20 reports to base station 10 information such as port 1 having fixed band domain A within the BC of band domains ABCD.

[0160] Furthermore, in the case of a port where the band is fixed, a predetermined number of layers (e.g., 2) can be reported as the MIMO number for that band, or the predetermined number of layers (e.g., 2) can not be reported for other bands as the MIMO number.

[0161] Additionally, the band in Example 8 (the object band that is reported to be able to switch the number of ports in the band) can also be a band outside the band within the BC reported in Example 1.

[0162] <Example 9>

[0163] Terminal 20 can also report information related to the handover candidate bands in each port of the BC used for UL Tx switching as described in Example 1. For example, terminal 20 reports to base station 10 information such as port 1 using A and B as handover candidates and port 2 using A, B, C, and D as handover candidates in the BC of band ABCD.

[0164] In addition, terminal 20 can also report the number of corresponding ports in each band within the above BC to base station 10 (e.g., A is 2, B is 2, C is 1, D is 1, etc.).

[0165] Alternatively, the band field (switching candidate band field) in Example 9 can also be a band field outside the band field within BC reported in Example 1.

[0166] By using the technology of the first embodiment described in Examples 1 to 9, the base station 10 can know the terminal 20's capabilities related to UL Tx switching, and thus can implement settings, instructions or scheduling for appropriately implementing UL Tx switching.

[0167] (Second Implementation)

[0168] In the second embodiment, terminal 20 is set or instructed from base station 10 via any one or more of RRC signaling, MAC-CE, and DCI, at least one of Examples 1 to 9 below. Alternatively, terminal 20 may be set or instructed from base station 10 via any one or all of Examples 1 to 9.

[0169] <Example 1>

[0170] Terminal 20 is configured by base station 10 to include either a DL / UL serving cell (a cell with both UL and DL carriers) for Rel-18 UL Tx switching, or a UL-only serving cell (a cell with only UL carriers) for Rel-18 UL Tx switching. Terminal 20 may also be configured by base station 10 to include both a DL / UL serving cell for Rel-18 UL Tx switching and a UL-only serving cell for Rel-18 UL Tx switching. Here, "being configured with certain information" means that terminal 20 receives this information from base station 10.

[0171] Based on the capabilities received from the terminal 20 in the first embodiment, the base station 10 can determine which cell to assign to the terminal 20. For example, the base station 10 can assign the cell (carrier) included in the BC received in Example 1 of the first embodiment as the serving cell to the terminal 20.

[0172] Furthermore, for example, base station 10 may also set a cell in a band that does not require a DL carrier as a UL-only serving cell to terminal 20 based on the information received in Example 3 of the first embodiment.

[0173] Assume that the serving cell in Examples 2 through 9 is the cell set for terminal 20 in Example 1. However, this is not a limitation; the serving cell in Examples 2 through 9 can also be a cell other than the cell set in Example 1.

[0174] The settings / instructions in Examples 2 to 9 can be performed either during the cell setting in Example 1 or at a later time after the cell setting in Example 1.

[0175] <Example 2>

[0176] Terminal 20 receives specific IE / parameters from base station 10 through ServingCellConfig for a specific cell, and thereby sets the specific IE / parameters in terminal 20.

[0177] Terminal 20 can identify that the cell contains a UL for Rel-18 UL Tx switching by receiving specific IE / parameters from base station 10. Additionally, ServingCellConfig is an example; other messages or signals can also be used.

[0178] <Example 3>

[0179] Terminal 20 can identify a cell as a UL-only serving cell for Rel-18 UL Tx switching by having specific IE / parameters set by base station 10 for a cell through ServingCellConfig.

[0180] In addition, terminal 20 can also identify a cell as a UL-only serving cell for Rel-18 UL Tx switching if the base station 10 has not set specific IE / parameters in the ServingCellConfig for a certain cell.

[0181] Additionally, ServingCellConfig is an example; other messages or signals can also be used.

[0182] <Example 4>

[0183] Terminal 20 is configured by base station 10 with information relating to other serving cells in each serving cell that can be instructed to handover and / or simultaneously transmit. For example, suppose ServingCellConfig contains information about other serving cells that can be instructed to handover / simultaneously transmit.

[0184] For example, suppose terminal 20 receives an RRC message (e.g., ServingCellConfig) for cell A. When cell B is detected in the RRC message as another serving cell that can be instructed to handover / simultaneously transmit, handover / simultaneous transmission of cell A and cell B can be instructed.

[0185] <Example 5>

[0186] Terminal 20 may also be configured by base station 10 in each serving cell, according to each combination with other serving cells, with information regarding whether or not a switching period is included. Alternatively, the information regarding whether or not a switching period is included may be configured not on a per-combination basis with other serving cells, but on a serving cell basis or on a cell group basis.

[0187] For example, suppose an RRC message (e.g., ServingCellConfig, CellGroupConfig) contains information regarding whether a switching period exists. For instance, suppose terminal 20 receives an RRC message for cell A and detects within that message information indicating "a switching period exists in cell B during the handover between cell A and cell B." In this case, upon receiving UL scheduling information indicating a handover between cell A and cell B, terminal 20 performs the handover during the switching period on the cell B side.

[0188] <Example 6>

[0189] Terminal 20 is configured by base station 10 with respect to whether power boosting is possible in each serving cell, according to each combination with other serving cells. Alternatively, the information regarding whether power boosting is possible may be configured on a serving cell basis or on a cell group basis, rather than on a combination with other serving cells.

[0190] For example, suppose an RRC message (e.g., ServingCellConfig, CellGroupConfig) contains information regarding whether power boosting is permissible. For instance, suppose terminal 20 receives an RRC message and detects within it that the message indicates "power boosting is permissible during handover between cell A and cell B, provided that two ports are simultaneously transmitting in cell A." In this case, terminal 20, for example, if it receives UL scheduling information indicating simultaneous two-port transmission in cell A during a handover from cell B to cell A, will implement power boosting.

[0191] <Example 7>

[0192] Terminal 20 is configured by base station 10 with information regarding whether it can transmit simultaneously in each serving cell, according to each combination with other serving cells. Alternatively, the information regarding whether it can transmit simultaneously may be configured not for each combination with other serving cells, but on a serving cell basis or on a cell group basis. Regarding the configuration on a serving cell basis, for example, if "can transmit simultaneously" is configured for cell A, then as long as it is in combination with cell A, it can mean that it can transmit simultaneously with any cell.

[0193] For example, suppose an RRC message (e.g., ServingCellConfig, CellGroupConfig) contains information regarding whether simultaneous transmission is possible. For instance, suppose terminal 20 receives an RRC message for cell A and detects within that message that it indicates "simultaneous transmission is possible in cells A and B." In this case, imagine terminal 20 receives UL scheduling information indicating simultaneous transmission in cells A and B. In this scenario, base station 10 can perform UL scheduling for terminal 20 to achieve simultaneous transmission in cells A and B.

[0194] <Example 8>

[0195] Terminal 20 may also be configured by base station 10 in each serving cell, according to each combination with other serving cells, to be instructed with information related to the case interpretation of a handover from one specific port structure to another. Alternatively, it may be configured not in each combination with other serving cells, but on a serving cell basis or on a cell group basis to be instructed with information related to the case interpretation of a handover from one specific port structure to another.

[0196] For example, suppose an RRC message (e.g., ServingCellConfig, CellGroupConfig) contains information related to the interpretation of the situation.

[0197] For example, when terminal 20 receives the aforementioned RRC message, and detects that the RRC message contains "information used to uniquely determine the situation number of the migration destination when migrating from a state (a situation number) of a certain transmission chain to another state (another situation number) after UL Tx switching", it determines the transmission chain (port structure) of the migration destination after UL Tx switching based on the information.

[0198] The aforementioned "information used for decision-making" can be an explicit "group of case number before migration and case number of migration destination", or it can be information indicating "2 ports connected to 1 carrier" or information indicating "1 port connected to 1 carrier".

[0199] Here, as an example, let's consider using... Figure 17 as well as Figure 18 The configuration and transmission port structure are described below. Furthermore, it is assumed that "option 2: simultaneous transmission across up to 2 carriers" is enabled. For simplicity, it is assumed that only the following configuration is used. Figure 18 Situation 1, Situation 2 and Situation 3.

[0200] In terminal 20, it is assumed that as the explicit information mentioned above, "If the terminal is in situation 2 before migration, and situation 1 and situation 3 exist as candidates for the migration destination, then migrate to situation 3". At this time, if terminal 20 is in situation 2 and is scheduled by DCI in a manner equivalent to 1P+OP+OP+OP, then switch to situation 3.

[0201] Suppose that in terminal 20, information indicating "1 port connected to 1 carrier" is set as described above. At this time, if terminal 20 is scheduled by DCI to transmit UL as 1P+0P+0P+0P in state 2, it switches to state 1.

[0202] Base station 10 can anticipate the aforementioned migration destinations and perform subsequent scheduling.

[0203] <Example 9>

[0204] Terminal 20 is configured by base station 10 with information related to the number of ports for bandpass handover targets on a cell group basis. Alternatively, terminal 20 may also be configured by base station 10 with information related to whether each serving cell is associated with a port for a bandpass handover target. Furthermore, terminal 20 may also be configured by base station 10 with information related to whether each serving cell is associated with a port for a non-bandpass handover target.

[0205] Information regarding whether a serving cell is associated with a handover target port is an example of information related to the antenna port of the target undergoing handover. Information regarding whether a serving cell is associated with a non-handover target port is an example of information related to the antenna port of the target not undergoing handover.

[0206] For example, suppose that when terminal 20 receives information from base station 10 via an RRC message equivalent to "cells A and B are the handover targets of port 1, and port 2 is fixedly used in cell C", it is scheduled to "transmit through port 1 in cell A or cell B, and transmit through port 2 in cell C". Furthermore, base station 10 can schedule terminal 20 to "transmit through port 1 in cell A or cell B, and transmit through port 2 in cell C".

[0207] By using the technology of the second embodiment described in Examples 1 to 9, the base station 10 can set / instruct the terminal 20 in accordance with the UL Tx switching capability, and thus can appropriately implement UL Tx switching.

[0208] (Third implementation)

[0209] <Prerequisites and Topics>

[0210] In 3GPP Rel-18, from the perspective of reducing the implementation load and complexity of terminal 20, the minimum separation time for specifying the minimum interval of UL transmission during switching between band domains was studied.

[0211] Specifically, regarding UL Tx switching schemes across up to 3 or 4 bands, the following options were investigated for the minimum separation time between two UL Tx switching schemes. Other options are also not excluded.

[0212] • Alt.1: Define the 14 symbols based on the subcarrier spacing (SCS) as the minimum separation time.

[0213] • Alt.2: Set the UL Tx switching within the SCS-based reference time slot to less than 1 time.

[0214] • Alt.3: When a total of 3 bands are involved, X time slots are defined as the minimum separation time. When a total of 4 bands are involved, Y time slots are defined as the minimum separation time. X and / or Y are set to 1 or more.

[0215] • Alt.4: The terminal reports the minimum separation time for different switching cases.

[0216] In 3GPP Rel-16 and 17, the interval for UL Tx switching is specified in Chapter 6.16 of TS38.214 as follows.

[0217] UE does not expect in μ UL =max(μ UL，1 μ UL，2 Multiple UL Tx switching are performed within the time slot of μ. UL，1 The SCS corresponding to the active UL BWP of the UL carrier before the switching gap, μ UL，2 The SCS corresponding to the active UL BWP of another UL carrier after the switching gap.

[0218] Additionally, the switching gap can be interpreted as two UL transmissions (N) as specified in 3GPP TS38.214 Chapter 6.1.6, etc. TX1 N TX2 The time difference (N) between TX1 -N TX2 However, it can also be interpreted as related to Figure 8 The switching period shown is equivalent to the switching time. The switching gap can be used as the switched UL, and is a time applied to reduce complexity. The switching gap can be specified to be different from the existing switching period.

[0219] As mentioned above, it is stipulated that no more than two UL Tx switchings are expected within a time slot. For example, UL Tx switching can be performed in the latter half of time slot n and at the beginning of time slot n+1. In this case, since the interval of UL Tx switching becomes shorter, there are concerns that the implementation of the UE becomes more complex.

[0220] In addition, the minimum separation time has the following advantages and disadvantages.

[0221] • When there is a minimum separation time and the minimum separation time is long, the UE may be able to simplify the implementation of UL Tx switching (e.g., be able to rewrite the contents of the memory during the period until the next UL transmission handover without increasing the memory size of the radio frequency (RF) information).

[0222] • When there is a minimum separation time and the minimum separation time is long, the flexibility of UL scheduling for the UE is reduced (e.g., it constrains the scheduling of transmissions that require UL Tx switching).

[0223] Compared to Rel-16 and 17, it is not preferable to restrict extreme increases or higher implementation loads on the UE. On the other hand, in Rel-18, UL Tx switching in 3 or 4 band domains may also occur in switching migrations that were not conceived in Rel-16 and 17.

[0224] <Action Summary>

[0225] In this embodiment, for UL Tx switching, a minimum separation time is specified for multiple stages. Multiple stages can be two stages, but not necessarily two stages; a minimum separation time for more stages can also be specified. Here, we envision a minimum separation time for two stages.

[0226] Minimum Separation Time can be interpreted as the minimum interval between two UL transmissions that are adjacent in the time direction and switching between M (M is a natural number greater than 3) band domains. The minimum separation time specifies the minimum interval between these two UL transmissions; it can also be described as the minimum separation time for separating these two UL transmissions in the time direction.

[0227] Figure 20 This shows an example of the minimum separation time setting. Figure 20 This example illustrates the minimum separation time between UL transmissions (UL TX) in units of symbols. Furthermore, the unit of minimum separation time is not limited to symbols; it can also be a time slot, a mini-time slot, a half-frame, etc. Additionally, in... Figure 20 In this context, the number of symbols from the start of the previous UL transmission to the start of the next UL transmission (which may also include the switching gap) is set as the minimum separation time. However, as long as the interval between the two UL transmissions can be specified, the position in other time directions can also be set as the reference.

[0228] Specifically, as a baseline (Phase 1), a lenient (short) minimum separation time can be specified. This short minimum separation time can also be called the first minimum interval. For example, as... Figure 20 As shown, the number of symbols smaller than X symbols can be set to this short minimum separation time. For example, the same rules as Rel-16 and 17 can be applied to extend this to consider SCS with 3 or 4 bands.

[0229] As an additional (second phase) minimum separation time (also called Additional Minimum Separation Time), a strict (long) minimum separation time can be specified that applies only in specific situations. Examples of such specific situations include the following.

[0230] • Applicable only to UEs that report specific UE capabilities.

[0231] • Applicable only between UL Tx switching conditions that meet specific criteria.

[0232] The above two combinations

[0233] This long minimum separation time can also be called the second minimum interval. For example, such as... Figure 20 As shown, the number of symbols above X symbols can be set to this short minimum separation time.

[0234] Thus, terminal 20 (UE) can perform UL transmissions that apply a baseline-laden (short) minimum separation time (first minimum interval) or a minimum separation time that is stricter than the baseline minimum separation time (longer) (second minimum interval) for UL transmissions switching between M band domains, or apply a long minimum separation time for specific UL transmissions as described above.

[0235] Additionally, terminal 20 can apply a lenient (short) minimum separation time to all UL transmissions. However, the minimum separation time of the baseline may not be universal across all UL transmissions, and multiple different values ​​(such as the number of symbols) can be set.

[0236] Based on such a terminal 20 and base station 10, when executing UL Tx switching schemes across up to 3 or 4 bands, multiple minimum separation times of different lengths can be applied to specific UL transmissions as objects, thus enabling UL Tx switching that takes into account the implementation load and scheduling flexibility of the terminal.

[0237] <Action Example 1>

[0238] The minimum separation time, which serves as a baseline, can be any one of the following options.

[0239] • Option 1: UL Tx switching is set to a maximum of 1 time slot within the maximum SCS of the active UL BWP (Bandwidth part) of all bands included in the set 3 or 4 bands.

[0240] • Option 2: UL Txswitching is set to a maximum of 1 time slot within the maximum SCS in the active UL BWP based on the bands (bands before and after the switch) contained in the subsequent UL Tx switching.

[0241] • Option 3: Set the length of the number N of symbols of the largest (or smallest) SCS in the active UL BWP of all bands included in the set 3 or 4 band combinations to the minimum separation time.

[0242] • Option 4: Set the length of the maximum (or minimum) number of symbols N in the active UL BWP based on the bands (bands before and after the switch) included in the subsequent UL Tx switching to the minimum separation time.

[0243] Thus, the minimum separation time of the baseline can be set based on the SCS of the active BWPs (bandwidth portions) of M (e.g., 3 or 4) bands. Alternatively, the minimum separation time based on the SCS can refer to the time of one symbol calculated according to the set SCS (e.g., 8.325 μs for a 120 kHz SCS).

[0244] <Action Example 2>

[0245] The baseline lenient (short) minimum separation time can be applied to all UL transmissions, while the strict (long) minimum separation time (additional minimum separation time) can be applied only to specific situations as described above. More specific examples include the following.

[0246] • (Examples only applicable to UEs reporting specific UE capabilities)

[0247] • UEs that support dual UL for 3 or 4 band domain UL Tx switching

[0248] • UEs supporting up to 2 ports (maximum 2 ports) for multiple band domains

[0249] • Supports UEs with UL Tx switching including 3 or 4 band domains (supports 1T+1T, etc.)

[0250] • UEs that require Additional Minimum Separation Time to report as new capabilities

[0251] Thus, when the terminal 20 (UE) sends specific capability information of the terminal 20, it can send the application Additional Minimum Separation Time to the UL.

[0252] • (Examples applicable only between UL Tx switching conditions that meet specific criteria)

[0253] • UL Tx switching containing 3 or 4 band domains

[0254] • Includes reports on ULTx switching between band domains or band domain pairs that require Additional Minimum Separation Time.

[0255] Additionally, Additional Minimum Separation Time can be applied to a combination of examples that apply only to UEs reporting specific UE capabilities and examples that apply only between UL Tx switching that meets specific conditions.

[0256] In addition, as a strict (long) minimum separation time, at least one of the following options can be applied.

[0257] • Option 1: Within X slots of the maximum SCS in the active UL BWP of all bands included in the set 3 or 4 band combinations (BC), UL Tx switching is set to a maximum of Y times.

[0258] • Option 2: UL Txswitching is set to a maximum of Y times within X slots of the maximum SCS in the active UL BWP based on the band domains (band domain before and after the switch) contained in the subsequent UL Tx switching.

[0259] • Option 3: Set the length of the number of symbols M of the largest (or smallest) SCS in the active UL BWP of all bands included in the set 3 or 4 band combinations to Additional Minimum Separation Time.

[0260] • Option 4: Set the length of the number of symbols M of the largest (or smallest) SCS in the active UL BWP based on the bands (bands before and after the switch) included in the subsequent UL Tx switching to Additional Minimum Separation Time.

[0261] Alternatively, it can be M≥N, X>1, Y≥1, X>Y.

[0262] Thus, a strict (long) Additional Minimum Separation Time can be set based on the SCS of the active BWP (bandwidth portion) of M (e.g., 3 or 4) band domains.

[0263] <Other>

[0264] Action Example 1 illustrates an action related to the baseline’s loose (short) minimum separation time. Action Example 2 illustrates an action related to the strict (long) minimum separation time. However, actions obtained by combining parts of the various action examples can also be applied, and arbitrary action examples can also be applied in part.

[0265] Furthermore, as mentioned above, the time-related units such as time slots and symbols used in the action examples can also be represented by the same other units.

[0266] (Fourth implementation)

[0267] <Prerequisites and Topics>

[0268] In the aforementioned UL Tx switching schemes across up to 3 or 4 bands with a restriction of up to 2 Tx simultaneous transmissions, when two UL Tx switching operations are performed in two consecutive time slots, the Minimum Separation Time is the minimum interval between the first and second UL Tx switching operations. Specifically, it is the minimum interval between the transmission start timing after the first UL Tx switching and the transmission start timing after the second UL Tx switching. The Minimum Separation Time is the larger of the UE capability reported by terminal 20 and the switching period / switching gap of one UL Tx switching operation.

[0269] For example, desirable values ​​for UE capability are 0 μs and 500 μs. 0 μs can also be considered an example of a minimum separation time with a flat (short) baseline. 500 μs can be considered an example of a minimum separation time with a strict (long) baseline.

[0270] Against the backdrop described above, the inventors conducted in-depth research and found that when a value smaller than switching period / switching gap (e.g., "0 μs") is reported as a UE capability, or when the terminal 20 does not report a UE capability, the action of the terminal 20 is ambiguous.

[0271] First, consider the case where "0μs" is reported as a UE capability. In this case, if two UL Tx switchings are performed in two consecutive time slots, and the number of bands related to the UL Tx switching is three or more, the Minimum Separation Time is the switching period / switching gap of the second UL Tx switching. On the other hand, if two UL Tx switchings are performed in two consecutive time slots, and the number of bands related to the UL Tx switching is two, the Minimum Separation Time is not applied. That is, when "0μs" is reported as a UE capability, depending on whether the number of bands related to the UL Tx switching is three or more, the assumption of the terminal 20 regarding the minimum interval time that should be ensured for two UL Tx switchings changes, and the operation of the terminal 20 is unclear.

[0272] Second, consider the scenario where terminal 20 does not report UE capabilities. In this case, it is unclear whether Minimum Separation Time is applied, or whether Minimum Separation Time becomes the switching period / switching gap of the second UL Tx switching. Assuming that the number of bands related to UL Tx switching is two, similar to the case where Minimum Separation Time is not applied, then not reporting UE capabilities means not applying Minimum Separation Time. That is, UE capabilities are essentially used for reporting Incapability (meaning there is no capability supporting Minimum Separation Time).

[0273] In addition, if the terminal 20 does not report the UE capability, it is also considered that the number of bands related to UL Tx switching is more than 2 when UL Tx switching is performed in two consecutive time slots, but the constraints on the scheduling of the base station 10 will increase.

[0274] <Action Summary>

[0275] In view of the above issues, in UL Tx switching schemes across up to 3 or 4 bands with restriction of up to 2 Tx simultaneous transmission, terminal 20 and base station 10 can also perform the actions shown below.

[0276] Specifically, terminal 20 performs uplink transmission using N frequency bands selected from M frequency bands (M being a natural number greater than or equal to 3) frequency bands (N being a natural number less than or equal to M). When terminal 20 performs two uplink transmission handovers (UL Tx switching) within two consecutive time slots, it reports capability information related to the minimum interval between the two uplink transmission handovers. Terminal 20 reports capability information (UE capability) indicating whether an interval exceeding a specific value (e.g., 500 μs) is not required as the minimum interval between the two uplink transmission handovers.

[0277] Base station 10 performs uplink reception using N frequency bands selected from M frequency bands. Base station 10 envisions that, in the event of performing two uplink transmission handovers (UL Tx switching) within two consecutive time slots, terminal 20 reports capability information related to the minimum interval between the two uplink transmission handovers. Base station 10 envisions that terminal 20 reports capability information (UE capability) indicating whether an interval exceeding a specific value (e.g., 500 μs) is not required as the minimum interval for the two uplink transmission handovers.

[0278] Although not specifically limited, the ability of a UE to indicate whether the minimum interval for two UL Tx switching does not require an interval of more than a certain value (e.g., 500 μs) can also be referred to as FG49-Y.

[0279] As a fourth embodiment, consider the Alt shown below. Hereinafter, the case of performing UL Tx switching twice in two consecutive time slots will continue to be explained, provided that the number of bands related to the two UL Tx switchings is M (3 or more).

[0280] In Alt.1, if terminal 20 requires an interval exceeding a certain value (e.g., 500 μs) as the minimum interval for two UL Tx handovers, it will not report UE capabilities. In such cases, as... Figure 21 As shown, the minimum interval between two UL Tx switching operations must be at least a certain value (e.g., 500 μs). Alternatively, the switching period / switching gap of the second UL Tx switching operation can be shorter than the certain interval (e.g., 500 μs).

[0281] On the other hand, if the minimum interval for two UL Tx switching does not require an interval exceeding a specific value (e.g., 500 μs), the terminal 20 reports, as a UE capability, that the minimum interval for two UL Tx switching does not require an interval exceeding a specific value (e.g., 500 μs). In such a case, as... Figure 22 As shown, as the minimum interval between two UL Tx switchings, at least the switching period / switching gap of the second UL Tx switching must be ensured.

[0282] That is, in Alt.1, the case where the minimum interval between two UL Tx switchings is an interval greater than a certain value (e.g., 500μs) is set as the default, and the terminal 20 will report the meaning of the minimum interval between two UL Tx switchings without needing an interval greater than the certain value (e.g., 500μs) as the UE capability.

[0283] Additionally, the statement that an interval of more than a certain value (e.g., 500 μs) is not required can mean the same as the case where the number of band fields associated with two UL Txswitching operations is two, or it can mean that the Minimum Separation Time is not applied.

[0284] According to Alt.1, the default is that the minimum interval between two UL Tx switching operations is an interval greater than a certain value (e.g., 500 μs). The absence of an interval greater than a certain value (e.g., 500 μs) is not reported as a UE capability, thus preventing UE capabilities from being used in incapability reporting. Furthermore, UE capabilities can be represented using 1 bit of "0" and "1", thus suppressing the amount of information related to UE capabilities.

[0285] In Alt.2, if the minimum interval for two UL Tx switchings requires an interval greater than a certain value (e.g., 500 μs), the terminal 20 reports the meaning of the minimum interval for two UL Tx switchings being an interval greater than a certain value (e.g., 500 μs) as a UE capability. In such a case, as... Figure 21 As shown, the minimum interval between two UL Tx switching operations must be at least a certain value (e.g., 500 μs). Alternatively, the switching period / switching gap of the second UL Tx switching operation can be shorter than the specific interval (e.g., 500 μs).

[0286] On the other hand, if the minimum interval for two UL Tx switching does not require an interval exceeding a specific value (e.g., 500 μs), the terminal 20 reports, as a UE capability, that the minimum interval for two UL Tx switching does not require an interval exceeding a specific value (e.g., 500 μs). In such a case, as... Figure 22 As shown, as the minimum interval between two UL Tx switchings, at least the switching period / switching gap of the second UL Tx switching must be ensured.

[0287] Additionally, the statement that an interval of more than a certain value (e.g., 500 μs) is not required can mean the same as the case where the number of band fields associated with two UL Txswitching operations is two, or it can mean that the Minimum Separation Time is not applied.

[0288] Here, in Alt.2, regarding support for BCs across up to 3 or 4 bands with restriction of up to 2 Tx simultaneous transmissions (Rel-18 UL Txswitching), the prerequisite is that terminal 20 must report UE capabilities (FG49-Y). Terminal 20 may report UE capabilities (FG49-Y) for each BC. UE capabilities may be included in ULTxSwitchingBandCombList-r18.

[0289] According to Alt.2, reporting UE capabilities does not require intervals exceeding a specific value (e.g., 500 μs), thus preventing UE capabilities from being used in incapability reporting. Furthermore, since UE capabilities must be reported for BCs supporting Rel-18 UL Txswitching, scenarios where UE capabilities are not reported can be disregarded.

[0290] (Function and effect)

[0291] In this implementation, terminal 20 reports whether the minimum interval for two UL Tx switchings does not require a UE capability with an interval greater than a specific value (e.g., 500 μs). This structure avoids situations where UE capabilities are used in incapability reports and clarifies the actions of terminal 10.

[0292] (Device structure)

[0293] Next, an example of the functional structure of the base station 10 and terminal 20 that perform the processes and actions described above will be explained.

[0294] <Base Station 10>

[0295] Figure 23 This is a diagram illustrating an example of the functional structure of base station 10. (For example...) Figure 23 As shown, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130 and a control unit 140. Figure 23 The functional structure shown is only one example. The functional distinctions and names of the functional units can be arbitrary, as long as the actions involved in the embodiments of the present invention can be performed. Furthermore, the transmitting unit 110 and the receiving unit 120 can be collectively referred to as the communication unit.

[0296] The transmitting unit 110 includes the function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiving unit 120 includes the function of receiving various signals transmitted from the terminal 20 and obtaining, for example, higher-level information from the received signals. In addition, the transmitting unit 110 has the function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, PDCCH-based DCI, PDSCH-based data, etc. to the terminal 20.

[0297] The setting unit 130 stores the preset setting information and various setting information sent to the terminal 20 into the storage device of the setting unit 130, and reads them from the storage device as needed.

[0298] The control unit 140 schedules the DL reception or UL transmission of the terminal 20 via the transmission unit 110. Furthermore, the control unit 140 includes a function for performing LBT (Low Bit Bypass). Alternatively, the signal transmission-related functions of the control unit 140 can be included in the transmission unit 110, and the signal reception-related functions of the control unit 140 can be included in the receiving unit 120. Alternatively, the transmission unit 110 can be referred to as a transmitter, and the receiving unit 120 as a receiver.

[0299] Terminal 20

[0300] Figure 24 This is a diagram illustrating an example of the functional structure of terminal 20. For example... Figure 24 As shown, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. Figure 24 The functional structure shown is only one example. As long as the actions involved in the embodiments of the present invention can be performed, the functional distinctions and names of the functional units can be arbitrary. The transmitting unit 210 and the receiving unit 220 can also be collectively referred to as the communication unit.

[0301] The transmitting unit 210 generates a transmission signal based on the transmission data and transmits the transmission signal wirelessly. The receiving unit 220 wirelessly receives various signals and obtains higher-layer signals from the received physical layer signals. Furthermore, the receiving unit 220 has the function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals, PDCCH-based DCI, PDSCH-based data, etc., transmitted from the base station 10. Additionally, for example, as D2D communication, the transmitting unit 210 can also transmit PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel), etc., to other terminals 20, and the receiving unit 220 receives PSCCH, PSSCH, PSDCH, or PSBCH from other terminals 20. Furthermore, the transmitting unit 210 includes the antenna port described in this embodiment.

[0302] The setting unit 230 stores various setting information received by the receiving unit 220 from the base station 10 or other terminals into a storage device, and reads it from the storage device as needed. In addition, the setting unit 230 also stores preset setting information.

[0303] The control unit 240 controls the terminal 20. Alternatively, the signal transmission-related functions of the control unit 240 can be included in the transmitting unit 210, and the signal reception-related functions of the control unit 240 can be included in the receiving unit 220. Furthermore, the transmitting unit 210 can be referred to as a transmitter, and the receiving unit 220 as a receiver.

[0304] According to this embodiment, at least the following terminal, base station, and communication method are provided. The terminal, base station, and communication method are described below in eight appendices 1 to 8.

[0305] <Postscript 1>

[0306] (Note 1)

[0307] A terminal includes: a transmitting unit that, in a transmission switching mode in which at least one of a plurality of antenna ports can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across a total of three or more bands, reports the number of antenna ports capable of band switching to a base station as capability information; and a receiving unit that receives from the base station information relating to antenna ports that are subject to band switching, or information relating to antenna ports that are not subject to band switching.

[0308] (Note 2)

[0309] A terminal includes: a transmitting unit that, in a transmission switching mode in which at least one of a plurality of antenna ports can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across a total of three or more bands, reports band information used by antenna ports that do not perform band switching as capability information to a base station; and a receiving unit that receives from the base station information relating to antenna ports that are subject to band switching, or information relating to antenna ports that are not subject to band switching.

[0310] (Note 3)

[0311] In the terminal described in Note 1 or 2, if there is an antenna port that does not perform band switching, the transmitting unit reports the MIMO layer number of the band used by that antenna port as 2.

[0312] (Note 4)

[0313] In any of the terminals described in notes 1 to 3, the transmitting unit reports information related to the switching candidate bands in each antenna port.

[0314] (Note 5)

[0315] A base station includes: a receiving unit that receives, as capability information, the number of antenna ports capable of band switching from the terminal in a transmission switching mode in which at least one of a plurality of antenna ports of a terminal can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across a total of three or more bands; and a transmitting unit that transmits to the terminal information relating to antenna ports that are subject to band switching or information relating to antenna ports that are not subject to band switching.

[0316] (Note 6)

[0317] A communication method executed by a terminal, wherein, in a transmission switching mode in which at least one of a plurality of antenna ports can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across three or more bands in total, the number of antenna ports capable of band switching is reported to a base station as capability information, and the terminal receives from the base station information relating to antenna ports that are subject to band switching or information relating to antenna ports that are not subject to band switching.

[0318] According to any one of items 1 through 6, a technique is provided for appropriately switching the uplink transmission band in a wireless communication system. According to Appendix 3, the number of MIMO layers can be appropriately set. According to Appendix 4, simultaneous monitoring can be clearly defined, and the action becomes explicit. Individual control information can be well received in the scheduling source cell. According to Appendix 3, switching candidate bands becomes explicit.

[0319] <Appendix 2>

[0320] (Note 1)

[0321] A terminal includes: a transmitting unit that, in a transmission switching mode in which at least one of a plurality of antenna ports can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across a total of three or more bands, reports information related to the bands used in the transmission switching mode as capability information to a base station; and a receiving unit that, when migrating from one state related to the plurality of antenna ports to another state through band switching, receives information from the base station for determining one of the plurality of states as the migration destination if there are multiple candidate states.

[0322] (Note 2)

[0323] In the terminal described in Appendix 1, the receiving unit receives a set of information for determining the state, including the maximum number of antenna ports that can be used for transmission in a single band, or the state before migration and the state at the destination.

[0324] (Note 3)

[0325] In the terminal described in Appendix 1 or 2, the transmitting unit reports the number of carriers supported in the band used by the transmission switching mode to the base station.

[0326] (Note 4)

[0327] In any of the terminals described in notes 1 to 3, the transmitting unit reports information related to whether a downlink carrier is required in the band used by the transmission switching mode.

[0328] (Note 5)

[0329] A base station includes: a receiving unit that receives information related to the band used in a transmission switching mode as capability information from a terminal in a transmission switching mode in which at least one of a plurality of antenna ports can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across a total of three or more bands; and a transmitting unit that, when migrating from one state related to a plurality of antenna ports to another state through band switching, sends information to the terminal for determining one of the plurality of states as a migration destination if there are multiple candidate states.

[0330] (Note 6)

[0331] A communication method executed by a terminal, wherein, in a transmission switching mode in which at least one of a plurality of antenna ports can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across a total of three or more bands, information related to the bands used in the transmission switching mode is reported to a base station as capability information; and when migrating from one state related to the plurality of antenna ports to another state through band switching, if there are multiple candidate states as migration destinations, information for determining one of the multiple states is received from the base station.

[0332] According to any one of items 1 to 6, a technique is provided for appropriately switching the uplink transmission band in a wireless communication system. According to Appendix 2, the ambiguity of the migration destination can be eliminated, allowing for appropriate operation. According to Appendix 3, the number of carriers within the band becomes clear. According to Appendix 4, cells without downlink carriers can be configured.

[0333] <Appendix 3>

[0334] (Note 1)

[0335] A terminal includes: a transmitting unit that reports to a base station, in a transmission switching mode in which at least one of a plurality of antenna ports can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across a total of three or more bands, capability information indicating whether power enhancement is possible when transmitting through multiple antenna ports; and a receiving unit that receives from the base station information related to whether power enhancement is possible when transmitting through multiple antenna ports.

[0336] (Note 2)

[0337] In the terminal described in Appendix 1, the transmitting unit reports the capability information indicating whether a power boost can be performed to the base station for each combination of bands in which a switch is performed, each band, all combinations of bands within a band combination, or all supported band combinations.

[0338] (Note 3)

[0339] In the terminal described in Appendix 1 or 2, the receiving unit receives information related to whether power boosting is possible for each combination of serving cells, each serving cell, or each group of cells.

[0340] (Note 4)

[0341] A base station includes: a receiving unit that receives capability information indicating whether power enhancement is possible when transmitting through multiple antenna ports in a transmission switching mode in which at least one of a plurality of antenna ports of a terminal can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across a total of three or more bands; and a transmitting unit that transmits information to the terminal relating to whether power enhancement is possible when transmitting through multiple antenna ports.

[0342] (Note 5)

[0343] A communication method, executed by a terminal, wherein, in a transmission switching mode in which at least one of a plurality of antenna ports can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across a total of three or more bands, the terminal reports to a base station information indicating whether power enhancement is possible when transmitting through multiple antenna ports; and receives from the base station information related to whether power enhancement is possible when transmitting through multiple antenna ports.

[0344] According to any one of items 1 to 5, a technique is provided that enables appropriate switching of the uplink transmission band in a wireless communication system. According to Appendix 2, information related to power enhancement can be reported in various units. According to Appendix 3, information related to power enhancement can be set in various units.

[0345] <Appendix 4>

[0346] (Note 1)

[0347] A terminal includes: a transmitting unit that reports capability information related to the band that causes downlink communication interruption during switching to a base station in a transmission switching mode in which at least one of a plurality of antenna ports can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across three or more bands in total; and a receiving unit that receives control information for scheduling uplink transmission from the base station.

[0348] (Note 2)

[0349] In the terminal described in Appendix 1, the transmitting unit reports the capability information related to the band that causes downlink communication interruption during handover to the base station for each combination of bands that are switched within a band combination, each band, each combination of all combinations of bands within a band combination, or all supported band combinations.

[0350] (Note 3)

[0351] In the terminal described in Appendix 1 or 2, the transmitting unit reports a bitmap of each bit representing the presence or absence of downlink communication interruption in the band field as the capability information.

[0352] (Note 4)

[0353] A base station includes: a receiving unit that receives capability information related to a band that causes downlink communication interruption during switching in a transmission switching mode in which at least one of a plurality of antenna ports of a terminal can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across three or more bands in total; and a transmitting unit that transmits control information for scheduling uplink transmission to the terminal.

[0354] (Note 5)

[0355] A communication method executed by a terminal, wherein in a transmission switching mode in which at least one of a plurality of antenna ports can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across a total of three or more bands, capability information related to the bands that cause downlink communication interruption during switching is reported to a base station, and control information for scheduling uplink transmission is received from the base station.

[0356] According to any one of items 1 through 5, a technique is provided for appropriately switching the band domain used for uplink transmission in a wireless communication system. According to Appendix 2, information related to downlink communication interruptions can be reported in various units. According to Appendix 3, information related to downlink communication interruptions can be reported efficiently.

[0357] <Appendix 5>

[0358] (Note 1)

[0359] A terminal includes: a transmitting unit that reports to a base station information indicating the handover time spent between bands in a transmission handover mode in which at least one of a plurality of antenna ports can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across three or more bands in total; and a receiving unit that receives from the base station information related to the cell that generated the handover time.

[0360] (Note 2)

[0361] In the terminal described in Appendix 1, the transmitting unit reports the capability information indicating the handover time to the base station for each combination of bands in which a handover is performed, for each band, for each combination of all combinations of bands within a band combination, or for all supported band combinations.

[0362] (Note 3)

[0363] In the terminal described in Appendix 1 or 2, the receiving unit receives information related to the cell that generated the handover time, according to each combination of serving cells, each serving cell, or each group of cells.

[0364] (Note 4)

[0365] A base station includes: a receiving unit that receives, from the terminal, capability information indicating the handover time spent between bands in a transmission handover mode in which at least one of a plurality of antenna ports of a terminal can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across three or more bands in total; and a transmitting unit that transmits to the terminal information related to the cell that generated the handover time.

[0366] (Note 5)

[0367] A method performed by a terminal, wherein, in a transmission handover mode in which at least one of a plurality of antenna ports is capable of switching bands across more than two bands and the plurality of antenna ports are capable of switching the bands used for transmission across more than three bands in total, the terminal reports capability information indicating the handover time spent between bands to a base station and receives information from the base station related to the cell that generated the handover time.

[0368] According to any one of items 1 to 5, a technique is provided that enables appropriate switching of the uplink transmission band in a wireless communication system. According to Appendix 2, the ability to report handover time information in various units is available. According to Appendix 3, information related to handover time can be set in various units.

[0369] <Appendix 6>

[0370] (Note 1)

[0371] A terminal includes: a transmitting unit that reports capability information indicating whether simultaneous transmission is possible between bands to a base station in a transmission switching mode in which at least one of a plurality of antenna ports can switch bands across two or more bands and the plurality of antenna ports switch transmission bands across a total of three or more bands; and a receiving unit that receives information from the base station related to cells capable of simultaneous transmission.

[0372] (Note 2)

[0373] In the terminal described in Appendix 1, the transmitting unit reports the capability information indicating whether simultaneous transmission is possible to the base station for each combination of bands in which switching is performed within a band combination, for each band, for each combination of all combinations of bands within a band combination, or for all supported band combinations.

[0374] (Note 3)

[0375] In the terminal described in Appendix 1 or 2, the receiving unit receives information related to the cells that can be transmitted simultaneously, according to each combination of serving cells, each serving cell, or each group of cells.

[0376] (Note 4)

[0377] A base station includes: a receiving unit that receives capability information indicating whether simultaneous transmission is possible between bands in a transmission switching mode in which at least one of a plurality of antenna ports of a terminal can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across a total of three or more bands; and a transmitting unit that transmits information to the terminal related to cells capable of simultaneous transmission.

[0378] (Note 5)

[0379] A communication method executed by a terminal, wherein, in a transmission switching mode in which at least one of a plurality of antenna ports can switch bands across two or more bands and the plurality of antenna ports switch the bands used for transmission across a total of three or more bands, information indicating whether simultaneous transmission is possible between bands is reported to a base station, and information related to cells capable of simultaneous transmission is received from the base station.

[0380] According to any one of items 1 to 5, a technique is provided that enables appropriate switching of the uplink transmission band in a wireless communication system. According to Appendix 2, capability information indicating simultaneous transmission is possible can be reported in various units. According to Appendix 3, various information related to simultaneous transmission can be set.

[0381] <Appendix 7>

[0382] (Note 1)

[0383] A terminal includes: a control unit that controls uplink transmission using N (N is a natural number less than M) bands selected from M (M is a natural number greater than or equal to 3) bands; and a transmission unit that performs uplink transmission by applying a first minimum interval or a second minimum interval longer than the first minimum interval to the uplink transmission switching between the M bands, wherein the control unit applies the second minimum interval to a specific uplink transmission.

[0384] (Note 2)

[0385] In the terminal described in Appendix 1, the control unit sets at least one of the first minimum interval and the second minimum interval based on the subcarrier spacing of the active bandwidth portions of the M bands.

[0386] (Note 3)

[0387] In the terminal described in Appendix 1, the control unit applies the first minimum interval to all uplink transmissions.

[0388] (Note 4)

[0389] In the terminal described in Appendix 3, the control unit applies the second minimum interval to the uplink transmission when sending specific capability information of the terminal.

[0390] (Note 5)

[0391] A base station includes: a receiving unit that performs uplink reception using N (N is a natural number less than M) bands selected from M (M is a natural number greater than 3) bands; and a control unit that envisions applying a first minimum interval or a second minimum interval longer than the first minimum interval in the uplink reception that switches between the M bands, the control unit envisioning applying the second minimum interval to a particular uplink reception.

[0392] (Note 6)

[0393] A communication method includes the following steps: controlling uplink transmission using N (N is a natural number less than M) bands selected from M (M is a natural number greater than 3) bands; and performing uplink transmission that applies a first minimum interval or a second minimum interval longer than the first minimum interval to the uplink transmission switching between the M bands, wherein in the step of performing the uplink transmission, the second minimum interval is applied to a specific uplink transmission.

[0394] <Appendix 8>

[0395] (Note 1)

[0396] A terminal includes: a transmission unit that performs uplink transmission using N (N is a natural number less than M) bands selected from M (M is a natural number greater than or equal to 3) bands; and a control unit that, when performing two uplink transmission handovers in two consecutive time slots, reports capability information related to the minimum interval between the two uplink transmission handovers, wherein the control unit reports the capability information as information indicating whether an interval greater than a specific value is not required as the minimum interval between the two uplink transmission handovers.

[0397] (Note 2)

[0398] In the terminal described in Appendix 1, if the control unit requires an interval of more than the specified value as the minimum interval for the handover of the two uplink transmissions, it does not report the capability information; if it does not require an interval of more than the specified value as the minimum interval for the handover of the two uplink transmissions, it reports the meaning that it does not require an interval of more than the specified value as the capability information.

[0399] (Note 3)

[0400] In the terminal described in Appendix 1, when the control unit requires an interval of a specific value or higher as the minimum interval for the handover of the two uplink transmissions, it reports as capability information that the minimum interval for the handover of the two uplink transmissions is an interval of the specific value or higher. When the control unit does not require an interval of the specific value or higher as the minimum interval for the handover of the two uplink transmissions, it reports as capability information that the control unit does not require an interval of the specific value or higher as the minimum interval for the handover of the two uplink transmissions.

[0401] (Note 4)

[0402] A base station includes: a receiving unit that performs uplink reception using N (N is a natural number less than M) bands selected from M (M is a natural number greater than or equal to 3) bands; and a control unit that envisions that, in the event of performing two uplink transmission handovers in two consecutive time slots, a terminal reports capability information related to the minimum interval between the two uplink transmission handovers, wherein the control unit envisions the terminal reporting the capability information as information indicating whether an interval greater than a specific value is not required as the minimum interval between the two uplink transmission handovers.

[0403] (Note 5)

[0404] A communication method comprising: step A, performing uplink transmission using N (N is a natural number less than M) bands selected from M (M is a natural number greater than or equal to 3) bands; and step B, in the case of performing two uplink transmission handovers in two consecutive time slots, reporting capability information related to the minimum interval between the two uplink transmission handovers, wherein step B includes the step of reporting the capability information as information indicating whether an interval greater than a specific value is not required as the minimum interval between the two uplink transmission handovers.

[0405] (Hardware structure)

[0406] The block diagram used in the description of the above embodiments ( Figure 23 and Figure 24 The diagram illustrates blocks organized by function. These functional blocks (structural units) are implemented through any combination of at least one of hardware and software. Furthermore, there are no particular limitations on the implementation method of each functional block. That is, each functional block can be implemented using a single device that is physically or logically combined, or by directly or indirectly (e.g., using wired, wireless, etc.) connecting two or more physically or logically separate devices. Functional blocks can also be implemented by combining software within the aforementioned single or multiple devices.

[0407] The functions include judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning, but are not limited to these. For example, a functional block (structural unit) that performs the sending function is called a transmitting unit or transmitter. In short, as mentioned above, there are no particular limitations on the implementation method.

[0408] For example, in one embodiment of this disclosure, the base station 10, terminal 20, etc., can also function as a computer for processing the wireless communication method of this disclosure. Figure 25 This diagram illustrates an example of the hardware structure of a base station 10 and a terminal 20 according to one embodiment of the present disclosure. The base station 10 and the terminal 20 may also be configured as a computer device that physically includes a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0409] Additionally, in the following description, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware structure of base station 10 and terminal 20 can be configured to include one or more of the devices shown in the figures, or it can be configured to not include any of them.

[0410] The functions of base station 10 and terminal 20 are implemented by reading predetermined software (program) into hardware such as processor 1001 and storage device 1002, so that processor 1001 performs calculations and controls the communication of communication device 1004 or controls at least one of reading and writing data in storage device 1002 and auxiliary storage device 1003.

[0411] The processor 1001 controls the computer as a whole by instructing the operating system to operate. The processor 1001 may also be a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, the control unit 140 and control unit 240 described above can also be implemented using the processor 1001.

[0412] Furthermore, the processor 1001 reads programs (program code), software modules, or data from at least one of the auxiliary storage devices 1003 and communication devices 1004, and performs various processes accordingly. As a program, a program is used that causes the computer to perform at least a portion of the actions described in the above embodiments. For example, Figure 23 The control unit 140 of the base station 10 shown can also be implemented by a control program stored in the storage device 1002 and operated in the processor 1001. For example, Figure 24 The control unit 240 of the terminal 20 shown can also be implemented by a control program stored in the storage device 1002 and operated in the processor 1001. Although it has been described that the various processes described above are executed by one processor 1001, the various processes described above can also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be implemented by more than one chip. In addition, the program can also be sent from the network via a telecommunications line.

[0413] Storage device 1002 is a computer-readable recording medium, and may be composed of at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. Storage device 1002 may also be referred to as a register, cache, main memory (main storage device), etc. Storage device 1002 can store programs (program code), software modules, etc., that are executable for implementing the communication method according to one embodiment of this disclosure.

[0414] The auxiliary storage device 1003 is a computer-readable recording medium, such as at least one of the following: CD-ROM (CompactDisc ROM) or other optical discs, hard disks, floppy disks, magneto-optical discs (e.g., compact discs, digital multifunction discs, Blu-ray discs), smart cards, flash memory (e.g., cards, sticks, key drives), floppy disks, magnetic stripes, etc. The aforementioned storage medium may, for example, be a database, server, or other suitable media that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0415] The communication device 1004 is hardware (transceiver) used for communication between computers via at least one of a wired network and a wireless network. It may also be referred to as a network device, network controller, network interface card (NIC), communication module, etc. The communication device 1004 may, for example, be configured to include a high-frequency switch, duplexer, filter, frequency synthesizer, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, transceiver antennas, amplifier sections, transceiver sections, transmission path interfaces, etc., can also be implemented using the communication device 1004. The transceiver section may also be physically or logically separated into a transmitting section and a receiving section.

[0416] Input device 1005 is an input device that accepts input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, LED, etc.). Alternatively, input device 1005 and output device 1006 can also be integrated (e.g., a touch panel).

[0417] Furthermore, the processor 1001 and storage device 1002, among other devices, are connected via a bus 1007 for communicating information. The bus 1007 can be configured as a single bus or as different buses used between the devices.

[0418] Furthermore, the base station 10 and the terminal 20 can be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or a FPGA (Field Programmable Gate Array), and can also use this hardware to implement part or all of the functional blocks. For example, the processor 1001 can also be implemented using at least one of these hardware components.

[0419] Alternatively, the vehicle 2001 may have a terminal 20 or a base station 10. Figure 26 An example of the structure of vehicle 2001 is shown. For example... Figure 26 As shown, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a gearshift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, an electronic control unit 2010, various sensors 2021-2029, an information service unit 2012, and a communication module 2013. The various forms / implementations described in this disclosure can also be applied to communication devices mounted on the vehicle 2001, for example, to the communication module 2013. The functions of the terminal 20 can also be implemented in the communication module 2013.

[0420] The drive unit 2002 may be composed, for example, an engine, a motor, or a hybrid power system of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a steering wheel), configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel by the user.

[0421] The electronic control unit 2010 consists of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (I / O port) 2033. Signals from various sensors 2021 to 2029 of the vehicle 2001 are input to the electronic control unit 2010. The electronic control unit 2010 can also be referred to as an ECU (Electronic Control Unit).

[0422] The signals from various sensors 2021 to 2029 include current signals from current sensor 2021 that senses the current of the motor, speed signals of the front and rear wheels obtained by speed sensor 2022, air pressure signals of the front and rear wheels obtained by air pressure sensor 2023, vehicle speed signals obtained by vehicle speed sensor 2024, acceleration signals obtained by acceleration sensor 2025, accelerator pedal input signals obtained by accelerator pedal sensor 2029, brake pedal input signals obtained by brake pedal sensor 2026, gear lever operation signals obtained by gear lever sensor 2027, and detection signals obtained by object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0423] The Information Service Unit 2012 consists of various devices such as a car navigation system, audio system, speakers, television, and radio, which provide various information such as driving information, traffic information, and entertainment information, and one or more ECUs that control these devices. The Information Service Unit 2012 uses information obtained from external devices via communication modules 2013, etc., to provide various multimedia information and multimedia services to the occupants of the vehicle 2001.

[0424] The Driver Assistance System 2030 comprises various devices used to prevent accidents or reduce driver workload, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning devices (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps), gyroscope systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System)), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. Furthermore, the Driver Assistance System 2030 transmits and receives various information via the communication module 2013 to achieve driver assistance or autonomous driving functions.

[0425] The communication module 2013 can communicate with the microprocessor 2031 and the components of the vehicle 2001 via the communication port. For example, the communication module 2013 can send and receive data with the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, gear shift lever 2006, front wheel 2007, rear wheel 2008, axle 2009, microprocessor 2031 in the electronic control unit 2010, memory (ROM, RAM) 2032, and sensors 2021 to 2029 in the vehicle 2001 via the communication port 2033.

[0426] The communication module 2013, controlled by the microprocessor 2031 of the electronic control unit 2010, is a communication device capable of communicating with external devices. For example, it can transmit and receive various types of information with external devices via wireless communication. The communication module 2013 can be located inside or outside the electronic control unit 2010. External devices can be, for example, base stations, mobile stations, etc.

[0427] The communication module 2013 transmits the current signal from the current sensor input to the electronic control unit 2010 to an external device via wireless communication. Additionally, the communication module 2013 also transmits the following signals input to the electronic control unit 2010 via wireless communication to external devices: the front and rear wheel speed signals obtained by the speed sensor 2022; the front and rear wheel air pressure signals obtained by the air pressure sensor 2023; the vehicle speed signal obtained by the vehicle speed sensor 2024; the acceleration signal obtained by the acceleration sensor 2025; the accelerator pedal depressor signal obtained by the accelerator pedal sensor 2029; the brake pedal depressor signal obtained by the brake pedal sensor 2026; the gear shift lever operation signal obtained by the gear shift lever sensor 2027; and the detection signals for detecting obstacles, vehicles, pedestrians, etc., obtained by the object detection sensor 2028.

[0428] The communication module 2013 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) sent from external devices and displays it on the information service unit 2012 of the vehicle 2001. Furthermore, the communication module 2013 stores the various information received from external devices in a memory 2032 available to the microprocessor 2031. The microprocessor 2031 can also control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, gearshift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, and sensors 2021-2029 of the vehicle 2001 based on the information stored in the memory 2032.

[0429] (Supplement to the implementation method)

[0430] The embodiments of the present invention have been described above, but the disclosed invention is not limited to such embodiments. Those skilled in the art should understand various modifications, alterations, substitutions, and replacements. Specific numerical examples have been used to facilitate understanding of the invention, but unless otherwise specified, these values ​​are merely examples, and any appropriate values ​​may be used. The distinctions between items in the above description are not essential to the present invention; items described in two or more items may be combined as needed, and items described in one item may be applied to items described in another item (as long as there is no contradiction). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. Multiple functional units may be operated by a single physical component, or a single functional unit may be operated by multiple physical components. Regarding the processing described in the embodiments, the order of processing may be interchanged unless there is a contradiction. For ease of explanation, a functional block diagram has been used to illustrate the base station 10 and terminal 20, but such a device may also be implemented by hardware, software, or a combination thereof. The software operating according to the embodiments of the present invention via the processor of the base station 10 and the software operating according to the embodiments of the present invention via the processor of the terminal 20 may also be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server and other suitable storage media, respectively.

[0431] Furthermore, the notification of information is not limited to the forms / implementations described in this disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or combinations thereof. Additionally, RRC signaling may be referred to as an RRC message, for example, it may also be an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0432] The various forms / implementations described in this disclosure can also be applied to systems utilizing LTE (Long Term Evolution), LTE-A (LTE-Advanced), 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), other suitable systems, and next-generation systems extended therefrom. Furthermore, multiple systems can be combined (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) for application.

[0433] The processing procedures, timing, and flow of the various forms / implementations described in this specification may be rearranged in order, provided there is no contradiction. For example, the elements of various steps are indicated using an illustrative order for the methods described in this disclosure, but are not limited to the specific order indicated.

[0434] In this specification, certain actions performed by base station 10 may sometimes also be performed by its upper node, depending on the circumstances. In a network consisting of one or more network nodes having base station 10, it is obvious that various actions performed to communicate with terminal 20 can be performed by at least one of base station 10 and other network nodes besides base station 10 (e.g., considering MME or S-GW, but not limited to these). The above example illustrates the case where there is one other network node besides base station 10, but other network nodes can also be a combination of multiple other network nodes (e.g., MME and S-GW).

[0435] The information or signals described in this disclosure can be output from a higher (or lower) layer to a lower (or higher) layer. They can also be input or output via multiple network nodes.

[0436] Input or output information can be stored in a specific location (e.g., memory) or managed using a management table. Input or output information can be overwritten, updated, or appended. Output information can also be deleted. Input information can also be sent to other devices.

[0437] The determination in this disclosure can be made by a value represented by 1 bit (0 or 1), by a Boolean value (Boolean: true or false), or by a comparison of numerical values ​​(e.g., a comparison with a predetermined value).

[0438] Software, whether called software, firmware, middleware, microcode, hardware description language, or by other names, should be broadly interpreted as referring to commands, command sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0439] In addition, software, commands, and information can also be sent and received via transmission media. For example, when software is sent from a webpage, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of transmission media.

[0440] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, the data, commands, instructions, information, signals, bits, symbols, chips, etc., that may be involved in the above description as a whole can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination of these.

[0441] Furthermore, the terms used in this disclosure and those necessary for understanding this disclosure may be replaced with terms that have the same or similar meanings. For example, at least one of the channel and symbol may also be a signal (signaling). Additionally, a signal may also be a message. Furthermore, a component carrier (CC) may also be referred to as carrier frequency, cell, frequency carrier, etc.

[0442] The terms "system" and "network" as used in this disclosure are used interchangeably.

[0443] Furthermore, the information, parameters, etc., described in this disclosure may be represented using absolute values, relative values ​​to predetermined values, or other corresponding information. For example, wireless resources may be indicated using indexes.

[0444] The names used for the above parameters are non-limiting in any respect. Furthermore, the formulas, etc., using these parameters sometimes differ from those explicitly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by all appropriate names, therefore the various names assigned to these channels and information elements are non-limiting in any respect.

[0445] In this disclosure, the terms "base station (BS)," "wireless 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" are used interchangeably. Sometimes, terms such as macro cell, small cell, femtocell, and picocell are also used to refer to base stations.

[0446] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, its coverage area can be divided into several smaller areas, each of which can provide communication services through a base station subsystem (e.g., a small indoor base station RRH: Remote Radio Head). Terms such as "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base station and base station subsystem providing communication services within that coverage area.

[0447] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" are used interchangeably.

[0448] For mobile stations, those skilled in the art sometimes also use the following terms: subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handheld device, user agent, mobile client, client, or some other appropriate terms.

[0449] At least one of the base station and mobile station can also be referred to as a transmitting device, receiving device, communication device, etc. Additionally, at least one of the base station and mobile station can also be a device mounted on a mobile body, the mobile body itself, etc. This mobile body can be a vehicle (e.g., a car, an airplane, etc.), a mobile body moving in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanized or unmanned). Furthermore, at least one of the base station and mobile station also includes devices that do not necessarily move during communication. For example, at least one of the base station and mobile station can be an IoT (Internet of Things) device such as a sensor.

[0450] Furthermore, the base station in this disclosure can also be replaced by a terminal. For example, the communication between the base station and the terminal can be replaced by communication between multiple terminals 20 (e.g., D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.), and various forms / implementations of this disclosure can also be applied. In this case, the terminal 20 can also be configured to have the functions of the base station 10 described above. In addition, terms such as "uplink" and "downlink" can be replaced with terms corresponding to communication between terminals (e.g., "side"). For example, uplink channel, downlink channel, etc. can also be replaced with side channel.

[0451] Similarly, the terminal in this disclosure can be replaced by a base station. In this case, the base station can also be configured to have the functions of the aforementioned terminal.

[0452] The terms "determining" and "determining" as used in this disclosure sometimes encompass a variety of actions. For example, "determining" and "determining" may include actions that involve judging, calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, database, or other data structure), or ascertaining, which are considered to have been "judged" or "determined." Furthermore, "determining" and "determining" may include actions that involve receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, or accessing (e.g., accessing data in memory), which are considered to have been "judged" or "determined." Furthermore, "judgment" and "decision" can encompass matters that have undergone resolving, selecting, choosing, establishing, or comparing, thus considering them as matters that have undergone "judgment" or "decision." That is, "judgment" and "decision" can include matters that have been considered as matters that have undergone "judgment" or "decision." Additionally, "judgment (decision)" can also be replaced by "assuming," "expecting," or "considering," etc.

[0453] The terms "connected," "coupled," or any variations thereof are intended to indicate any direct or indirect connection or combination between two or more elements, including cases where there is one or more intermediate elements between the two elements that are "connected" or "coupled." The combination or connection between elements can be physical, logical, or a combination of these. For example, "access" can be used instead of "connected." In the context of this disclosure, it can be understood that two elements are "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, and, as some non-limiting and non-inclusive examples, using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, and light (including both visible and invisible regions) to "connect" or "couple" to each other.

[0454] The reference signal can be simply called RS (Reference Signal), or, depending on the standard applied, pilot.

[0455] As used in this disclosure, the word "based on" does not mean "based on only" unless otherwise expressly stated. In other words, the word "based on" means both "based on only" and "based on at least".

[0456] Any reference to an element using the designations "first," "second," etc., as used in this disclosure does not necessarily limit the number or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, references to the first and second elements do not imply that only two elements can be taken, or that in any form the first element must precede the second element.

[0457] Alternatively, the "unit" in the structure of the above devices can be replaced with "section", "circuit", "equipment", etc.

[0458] When the terms "include," "including," and their variations are used in this disclosure, these terms, like the term "comprising," imply inclusion. Furthermore, the term "or" as used in this disclosure does not refer to XOR.

[0459] A radio frame can consist of one or more frames in the time domain. In the time domain, one or more frames can be called subframes. A subframe can also consist of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) independent of the parameter set (numerology).

[0460] A parameter set can be communication parameters applied to at least one side of the transmission and reception of a signal or channel. For example, a parameter set can represent at least one of the following: Sub-Carrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transceiver in the frequency domain, and specific windowing processing performed by the transceiver in the time domain.

[0461] In the time domain, a time slot can be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). A time slot can be a time unit based on a set of parameters.

[0462] A time slot can contain multiple mini-time slots. Each mini-time slot can consist of one or more symbols in the time domain. Furthermore, a mini-time slot can also be called a sub-time slot. A mini-time slot can consist of fewer symbols than a time slot. PDSCH (or PUSCH) transmitted in time units larger than mini-time slots can be called PDSCH (or PUSCH) mapping type (type) A. PDSCH (or PUSCH) transmitted using mini-time slots can be called PDSCH (or PUSCH) mapping type (type) B.

[0463] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols can each be referred to by other corresponding names.

[0464] For example, a subframe can be called a Transmission Time Interval (TTI), multiple consecutive subframes can also be called a TTI, and a time slot or a mini-time slot can also be called a TTI. That is, at least one of a subframe and a TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Furthermore, the unit representing TTI may not be called a subframe, but rather a time slot, mini-time slot, etc. Additionally, a time slot can also be called a unit of time. The unit of time can correspond to a parameter set that varies for each cell.

[0465] Here, TTI refers, for example, to the smallest unit of time for scheduling in wireless communication. For instance, in an LTE system, the base station schedules the allocation of radio resources (bandwidth, transmit power, etc., available to each terminal 20) in units of TTI. However, the definition of TTI is not limited to this.

[0466] The Time Interval (TTI) can be a unit of time for transmitting channel-coded data packets (transmission blocks), code blocks, codewords, etc., or it can be a processing unit such as scheduling or link adaptation. Furthermore, when a TTI is given, the actual time interval (e.g., the number of symbols) that the transmission block, code block, codeword, etc., are mapped to can be shorter than the TTI.

[0467] Furthermore, when one time slot or one mini-time slot is referred to as a TTI, more than one TTI (i.e., more than one time slot or more than one mini-time slot) can become the minimum time unit for scheduling. In addition, the number of time slots (mini-time slots) constituting the minimum time unit for scheduling can be controlled.

[0468] A TTI with a duration of 1ms is also called a normal TTI (TTI in LTE Rel.8-12), a long TTI, a normal subframe, a long subframe, or a time slot. A TTI shorter than a normal TTI can also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini time slot, a sub-time slot, or a time slot.

[0469] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) can be understood as a TTI with a duration of more than 1ms, and a short TTI (e.g., a shortened TTI, etc.) can be understood as a TTI with a duration of less than a long TTI but more than 1ms.

[0470] A resource block (RB) is a unit of resource allocation in both the time and frequency domains. In the frequency domain, it can contain one or more consecutive subcarriers. The number of subcarriers contained in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers contained in an RB can also be determined based on the parameter set.

[0471] Furthermore, the temporal domain of an RB can contain one or more symbols, which can be a single time slot, a single mini-time slot, a single subframe, or the length of a single TTI. A single TTI, a single subframe, etc., can each be composed of one or more resource blocks.

[0472] In addition, one or more RBs can also be called Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0473] Furthermore, a resource block can consist of one or more resource elements (REs). For example, one RE can be a radio resource area consisting of one subcarrier and one symbol.

[0474] The Bandwidth Part (BWP) (also known as partial bandwidth, etc.) can also represent a subset of contiguous common resource blocks (RBs) used for a certain parameter set in a certain carrier. Here, common RBs can be determined by indexing RBs based on a common reference point of that carrier. PRBs can be defined and numbered within a BWP.

[0475] A BWP can include a UL BWP and a DL BWP. One or more BWPs can be set for a UE within a single carrier.

[0476] At least one of the configured BWPs can be active, and it is not assumed that the UE will transmit or receive predetermined signals / channels outside of an active BWP. In addition, "cell", "carrier", etc. in this disclosure can be replaced by "BWP".

[0477] The structures of radio frames, subframes, time slots, mini-time slots, and symbols described above are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained within a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, and the number of symbols in a TTI, symbol length, and cyclic prefix (CP) length can be varied in many ways.

[0478] In this disclosure, for example, in cases where articles are added through translation, such as in English (a, an, and the), this disclosure also includes cases where the noun following these articles is in a plural form.

[0479] In this disclosure, the phrase "A and B are different" can mean "A and B are not the same." Additionally, this phrase can also mean "A and B are each different from C." Terms such as "separate" and "combined" can also be interpreted in the same way as "different."

[0480] The various forms / implementations described in this disclosure can be used individually or in combination, and can be switched depending on the execution. Furthermore, the notification of predetermined information is not limited to explicit notification (e.g., a "Yes X" notification), but can also be implicit notification (e.g., not notifying the predetermined information).

[0481] The present disclosure has been described in detail above, but it will be 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 as modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the present disclosure is for illustrative purposes only and is not intended to be limiting.

[0482] Label Explanation

[0483] 10: Base station

[0484] 110: Sending Department

[0485] 120: Receiving Department

[0486] 130: Setting Department

[0487] 140: Control Department

[0488] 20: Terminal

[0489] 210: Sending Department

[0490] 220: Receiving Department

[0491] 230: Setting Department

[0492] 240: Control Department

[0493] 1001: Processor

[0494] 1002: Storage device

[0495] 1003: Auxiliary storage device

[0496] 1004: Communication device

[0497] 1005: Input device

[0498] 1006: Output device

[0499] 2001: Vehicles

[0500] 2002: Drive Unit

[0501] 2003: Steering Unit

[0502] 2004: Accelerator Pedal

[0503] 2005: Brake Pedal

[0504] 2006: Gear Shift

[0505] 2007: Front Wheel

[0506] 2008: Rear Wheel

[0507] 2009: Axle

[0508] 2010: Electronic Control Department

[0509] 2012: Information Services Department

[0510] 2013: Communication Module

[0511] 2021: Current Sensor

[0512] 2022: Speed ​​Sensor

[0513] 2023: Barometric Pressure Sensor

[0514] 2024: Vehicle Speed ​​Sensor

[0515] 2025: Accelerometer

[0516] 2026: Brake Pedal Sensor

[0517] 2027: Gearshift Sensor

[0518] 2028: Object Detection Sensor

[0519] 2029: Accelerator Pedal Sensor

[0520] 2030: Driver Assistance Systems Department

[0521] 2031: Microprocessors

[0522] 2032: Memory (ROM, RAM)

[0523] 2033: Communication port (IO port)

Claims

1. A terminal having: The transmitting unit performs uplink transmission using N bands selected from M bands. M is a natural number greater than 3, and N is a natural number less than M; as well as The control unit, when performing two uplink transmission handovers within two consecutive time slots, reports capability information related to the minimum interval between the two uplink transmission handovers. The control unit reports the capability information as indicating whether the minimum interval for the handover of the two uplink transmissions does not require an interval greater than a specific value.

2. The terminal according to claim 1, wherein, If the control unit requires an interval greater than the specific value as the minimum interval for the handover of the two uplink transmissions, it will not report the capability information. When the control unit is not required to have an interval greater than the specified value as the minimum interval for the handover of the two uplink transmissions, it reports the meaning of "not required to have an interval greater than the specified value as the minimum interval for the handover of the two uplink transmissions" as the capability information.

3. The terminal according to claim 1, wherein, When the control unit requires an interval of a specific value or higher as the minimum interval for the handover of the two uplink transmissions, it reports as capability information that the minimum interval for the handover of the two uplink transmissions is an interval of the specific value or higher. When the control unit is not required to have an interval greater than the specified value as the minimum interval for the handover of the two uplink transmissions, it reports the meaning of "not required to have an interval greater than the specified value as the minimum interval for the handover of the two uplink transmissions" as the capability information.

4. A base station, comprising: The receiving unit performs uplink reception using N bands selected from M bands, where... M is a natural number greater than 3, and N is a natural number less than M; as well as The control unit envisions that, in the event of performing two uplink transmission handovers within two consecutive time slots, the terminal reports capability information related to the minimum interval between the two uplink transmission handovers. The control unit envisions the terminal reporting information as capability information indicating whether the minimum interval for the handover of the two uplink transmissions does not require an interval greater than a specific value.

5. A communication method, comprising: Step A involves executing uplink transmissions using N bands selected from M bands, where... M is a natural number greater than 3, and N is a natural number less than M; as well as Step B involves reporting capability information related to the minimum interval between two uplink transmission handovers performed within two consecutive time slots. Step B includes the following steps: reporting information indicating whether the minimum interval for the handover of the two uplink transmissions does not require an interval greater than a specific value as the capability information.

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