Method and apparatus for transmitting and receiving signal in wireless communication system

Abstract

A method and an apparatus for transmitting and receiving a signal in a wireless communication system disclosed in the present specification perform uplink switching among three or more frequency bands. Here, the uplink switching gap may be set to the maximum value among the switching segments of each of the associated band pairs.

Description

Technical Field

[0001] The present disclosure relates to a method and an apparatus for use in a wireless communication system. Background Art

[0002] In general, wireless communication systems are being developed to cover a wide range in a diverse manner to provide communication services such as audio communication services, data communication services, etc. Wireless communication is a multiple access system that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power, etc.). For example, the multiple access system may include one of a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, a single carrier frequency division multiple access (SC-FDMA) system, and the like. Summary of the invention

[0003] Technical issues

[0004] An object of the present disclosure is to provide a signal transmitting and receiving method and apparatus thereof for efficiently transmitting and receiving a signal in a wireless communication system.

[0005] Those skilled in the art should understand that the objectives that can be achieved using the present disclosure are not limited to the contents specifically described above, and the above and other objectives that can be achieved by the present disclosure will be more clearly understood from the following detailed description.

[0006] Technical Solution

[0007] The present disclosure provides a method and apparatus for transmitting and receiving signals in a wireless communication system.

[0008] According to one aspect of the present disclosure, a method for sending and receiving signals by a user equipment (UE) in a wireless communication system includes the following steps: indicating capabilities for a switching period AB for a frequency band pair including frequency band A and frequency band B and a switching period AC for a frequency band pair including frequency band A and frequency band C, and performing 2-port transmission on a carrier of frequency band A, and then performing 1-port transmission on each carrier of frequency band B and frequency band C, wherein during an uplink (UL) switching gap, the 2-port transmission on the carrier of frequency band A or the 1-port transmission on each carrier of frequency band B and frequency band C is ignored, and the UL switching gap is the maximum value of the switching period AB and the switching period AC.

[0009] According to another aspect of the present disclosure, a method for sending and receiving signals by a base station (BS) in a wireless communication system includes the following steps: receiving an indication of a capability for a switching period AB for a band pair including band A and band B and a switching period AC for a band pair including band A and band C from a user equipment (UE), and receiving a 2-port transmission on a carrier of band A from the UE, and then receiving a 1-port transmission on each carrier of band B and band C from the UE, wherein, during an uplink (UL) switching gap, the 2-port transmission on the carrier of band A and the 1-port transmission on each carrier of band B and band C are ignored, and the UL switching gap is the maximum value of the switching period AB and the switching period AC.

[0010] In another aspect of the present disclosure, an apparatus, a processor, and a storage medium for performing a signal transmission and reception method are provided.

[0011] The apparatus may include an autonomous driving vehicle communicable with at least a UE, a network, and another autonomous driving vehicle other than the communication apparatus.

[0012] The above-mentioned aspects of the present disclosure are only some preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the present disclosure can be derived and understood by those skilled in the art from the following detailed description of the present disclosure.

[0013] Beneficial Effects

[0014] According to one embodiment of the present disclosure, when a control signal and a data signal are transmitted and received between communication devices, the signals can be transmitted and received more efficiently based on an operation different from that in the related art.

[0015] Those skilled in the art should understand that the effects that can be achieved through the present disclosure are not limited to the contents that have been specifically described above, and other advantages of the present disclosure will be more clearly understood from the following detailed description in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The radio frame structure is shown.

[0017] Figure 2 The resource grid during the duration of a time slot is illustrated.

[0018] Figure 3 Figure 1 shows a self-contained time slot structure.

[0019] Figures 4 to 6 is a diagram illustrating a method of transmitting and receiving a signal according to an embodiment of the present disclosure.

[0020] Figures 7 to 10 An apparatus according to an embodiment of the present disclosure is illustrated. DETAILED DESCRIPTION

[0021] The following technologies may be used in various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA may be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented as a radio technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented as a radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wireless Fidelity (WiFi)), IEEE 802.16 (Worldwide Interoperability for Microwave Access (WiMAX)), IEEE 802.20, Evolved UTRA (E-UTRA), etc. UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA, and LTE-advanced (LTE-A) is an evolution of 3GPP LTE. 3GPP New Radio or New Radio Access Technology (NR) is an evolved version of 3GPP LTE / LTE-A.

[0022] For clarity of description, the present disclosure will be described in the context of 3GPP communication systems (e.g., LTE and NR), which should not be construed as limiting the spirit of the present disclosure. LTE refers to technology beyond 3GPP TS 36.xxx version 8. Specifically, LTE technology beyond 3GPP TS 36.xxx version 10 is called LTE-A, and LTE technology beyond 3GPP TS 36.xxx version 13 is called LTE-A pro. 3GPP NR is a technology beyond 3GPP TS 38.xxx version 15. LTE / NR may be referred to as a 3GPP system. "xxx" specifies a technical specification number. LTE / NR may be collectively referred to as a 3GPP system. Background technology, terms, abbreviations, etc. as used herein refer to technical specifications published prior to the present disclosure. For example, the following documents may be referenced.

[0023] 3GPP NR

[0024] -38.211: Physical channels and modulation

[0025] -38.212: Multiplexing and channel compilation

[0026] -38.213: Physical layer procedures for control

[0027] -38.214: Physical layer procedures for data

[0028] -38.300: NR and NG-RAN general description

[0029] -38.331: Radio Resource Control (RRC) protocol specification

[0030] Figure 1 The radio frame structure for NR is shown.

[0031] In NR, UL and DL transmissions are configured on a frame basis. Each radio frame has a length of 10ms and is divided into two 5ms half-frames. Each half-frame is divided into five 1ms subframes. A subframe is divided into one or more time slots, and the number of time slots in a subframe depends on the subcarrier spacing (SCS). Depending on the cyclic prefix (CP), each time slot includes 12 or 14 OFDM (A) symbols. When a normal CP is used, each time slot includes 14 OFDM symbols. When an extended CP is used, each time slot includes 12 OFDM symbols. Symbols may include OFDM symbols (or CP-OFDM symbols) and SC-FDMA symbols (or discrete Fourier transform-extended-OFDM (DFT-s-OFDM) symbols).

[0032] Table 1 exemplarily shows that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to the SCS in the normal CP case.

[0033] [Table 1]

[0034] SCS(15*2^u) <![CDATA[N slot symb ]]> <![CDATA[N frame，u slot ]]> <![CDATA[N subframe，u slot ]]> 15KHz(u=0) 14 10 1 30KHz(u=1) 14 20 2 60KHz(u=2) 14 40 4 120KHz(u=3) 14 80 8 240KHz(u=4) 14 160 16

[0035] *N slot symb : The number of symbols in a time slot

[0036] *N frame，u slot : Number of time slots in a frame

[0037] *N subframe，u slot : Number of time slots in a subframe

[0038] Table 2 shows that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS in the case of extended CP.

[0039] [Table 2]

[0040] SCS(15*2^u) <![CDATA[N slot symb ]]> <![CDATA[N frame，u slot ]]> <![CDATA[N subframe，u slot ]]> 60KHz(u=2) 12 40 4

[0041] In the NR system, different OFDM(A) parameter sets (e.g., SCS, CP length, etc.) may be configured for multiple cells aggregated for one UE. Therefore, the (absolute time) duration of a time resource (e.g., a subframe, a time slot, or a transmission time interval (TTI)) (referred to as a time unit (TU) for convenience) consisting of the same number of symbols may be configured differently between the aggregated cells.

[0042] In NR, various parameter sets (or SCS) can be supported to support various 5th generation (5G) services. For example, for an SCS of 15kHz, wide areas in the traditional cellular band can be supported, while for an SCS of 30kHz or 60kHz, dense urban areas, lower latency, and wide carrier bandwidth can be supported. For an SCS of 60kHz or higher, bandwidths greater than 24.25kHz can be supported to overcome phase noise.

[0043] The NR frequency band may be defined by two types of frequency ranges FR1 and FR2. FR1 and FR2 may be configured as described in Table 3 below. FR2 may be millimeter wave (mmW).

[0044] [Table 3]

[0045] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 450MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0046] Figure 2 The resource grid during the duration of one time slot is shown.

[0047] A time slot includes multiple symbols in the time domain. For example, a time slot includes 14 symbols in the normal CP case and 12 symbols in the extended CP case. A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) can be defined by multiple (e.g., 12) consecutive subcarriers in the frequency domain. Multiple RB interleavings (referred to as interleavings) can be defined in the frequency domain. Interleaving m∈{0, 1, ..., M-1} can be composed of (common) RBs{m, M+m, 2M+m, 3M+m, ...}. M represents the number of interleavings. A bandwidth part (BWP) can be defined by multiple consecutive (physical) RBs ((P)RBs) in the frequency domain and corresponds to a parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., five) BWPs. Data communication can be performed in an active BWP, and only one BWP can be enabled for a UE. Each element in a resource grid can be referred to as a resource element (RE), to which a complex symbol can be mapped.

[0048] In a wireless communication system, a UE receives information from a BS in a downlink (DL), and the UE transmits information to the BS in an uplink (UL). The information exchanged between the BS and the UE includes data and various control information, and there are various physical channels / signals according to the type / purpose of the information exchanged therebetween. A physical channel corresponds to a set of resource elements (REs) that carry information from a higher layer. A physical signal corresponds to a set of REs that are used by the physical layer but do not carry information from a higher layer. The higher layer includes a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, and the like.

[0049] DL physical channels include physical broadcast channel (PBCH), physical downlink shared channel (PDSCH) and physical downlink control channel (PDCCH). DL physical signals include DL reference signal (RS), primary synchronization signal (PSS) and secondary synchronization signal (SSS). DL RS includes demodulation reference signal (DM-RS), phase tracking reference signal (PT-RS) and channel state information reference signal (CSI-RS). UL physical channels include physical random access channel (PRACH), physical uplink shared channel (PUSCH) and physical uplink control channel (PUCCH). UL physical signals include UL RS. UL RS includes DM-RS, PT-RS and sounding reference signal (SRS).

[0050] Figure 3 The structure of a self-contained time slot is illustrated.

[0051] In the NR system, a frame has a self-contained structure in which a DL control channel, DL or UL data, a UL control channel, etc. can all be included in one time slot. For example, the first N symbols in a time slot (hereinafter, the DL control region) can be used to send a DL control channel, and the last M symbols in a time slot (hereinafter, the UL control region) can be used to send a UL control channel. N and M are integers greater than or equal to 0. The resource region (hereinafter, the data region) between the DL control region and the UL control region can be used for DL ​​data transmission or UL data transmission. For example, the following configuration can be considered. List the various parts in chronological order.

[0052] In the present disclosure, a base station (BS) may be, for example, a gNode B (gNB).

[0053] UL physical channel / signal

[0054] (1) PUSCH

[0055] The PUSCH may carry UL data (e.g., uplink shared channel (UL-SCH) transport blocks (TBs)) and / or uplink control information (UCI). The PUSCH may be sent based on a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete Fourier transform spread OFDM (DFT-s-OFDM) waveform. When the PUSCH is sent based on a DFT-s-OFDM waveform, the UE may send the PUSCH by applying transform precoding. For example, when transform precoding is not allowed (e.g., when transform precoding is disabled), the UE may send the PUSCH based on a CP-OFDM waveform. When transform precoding is allowed (e.g., when transform precoding is enabled), the UE may send the PUSCH based on a CP-OFDM waveform or a DFT-s-OFDM waveform. PUSCH transmissions may be dynamically scheduled by PDCCH (dynamic scheduling) or semi-statically scheduled by higher layer signaling (e.g., RRC signaling) (and / or layer 1 (L1) signaling (e.g., PDCCH)) (configured scheduling (CS)). Therefore, in dynamic scheduling, PUSCH transmissions may be associated with PDCCH, while in CS, PUSCH transmissions may not be associated with PDCCH. CS may include PUSCH transmissions based on type 1 configuration grants (CGs) and PUSCH transmissions based on type 2CGs. For type 1CG, all parameters for PUSCH transmissions may be signaled by higher layers. For type 2CG, some parameters for PUSCH transmissions may be signaled by higher layers, and the rest may be signaled via PDCCH. Basically, in CS, PUSCH transmissions may not be associated with PDCCH.

[0056] (2) PUCCH

[0057] PUCCH can carry UCI. UCI includes the following information.

[0058] - Scheduling Request (SR): SR is information for requesting UL-SCH resources.

[0059] - Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK): HARQ-ACK is a signal in response to the reception of a DL signal (e.g., PDSCH, SPS release PDCCH, etc.). The HARQ-ACK response may include positive ACK (ACK), negative ACK (NACK), DTX (discontinuous transmission), or NACK / DTX. HARQ-ACK may be used interchangeably with A / N, ACK / NACK, HARQ-ACK / NACK, etc. HARQ-ACK may be generated based on TB / CBG.

[0060] - Channel State Information (CSI): CSI is feedback information about a DL channel. CSI includes a channel quality indicator (CQI), a rank indicator (RI), a precoding matrix indicator (PMI), a precoding type indicator (PTI), etc.

[0061] Table 4 shows the PUCCH format. The PUCCH format may be classified according to UCI payload size / transmission length (e.g., the number of symbols included in the PUCCH resource) and / or transmission structure. The PUCCH format may be classified into short PUCCH formats (PUCCH formats 0 and 2) and long PUCCH formats (PUCCH formats 1, 3, and 4) according to the transmission length.

[0062] [Table 4]

[0063]

[0064] (0)PUCCH format 0 (PF0)

[0065] - Supported UCI payload size: up to K bits (e.g., K=2)

[0066] -Number of OFDM symbols included in one PUCCH: 1 to X symbols (eg, X=2)

[0067] -Transmission structure: Only UCI signal is configured without DM-RS, and UCI status is transmitted by selecting and transmitting one of multiple sequences.

[0068] (1) PUCCH format 1 (PF1)

[0069] - Supported UCI payload size: up to K bits (e.g., K=2)

[0070] -Number of OFDM symbols included in one PUCCH: Y to Z symbols (e.g., Y=4 and Z=14)

[0071] -Transmission structure: UCI and DM-RS are configured in different OFDM symbols based on time division multiplexing (TDM). For UCI, a specific sequence is multiplied by the modulation symbol (e.g., QPSK symbol). Cyclic shift / orthogonal cover code (CS / OCC) is applied to both UCI and DM-RS to support code division multiplexing (CDM) between multiple PUCCH resources (compliant with PUCCH format 1) (in the same RB).

[0072] (2) PUCCH format 2 (PF2)

[0073] - Supportable UCI payload size: more than K bits (e.g., K=2)

[0074] -Number of OFDM symbols included in one PUCCH: 1 to X symbols (eg, X=2)

[0075] - Transmission structure: UCI and DMRS (DM-RS) are configured / mapped to the same symbol based on frequency division multiplexing (FDM), and coded UCI bits are transmitted by applying only inverse fast Fourier transform (IFFT) thereto without DFT.

[0076] (3) PUCCH format 3 (PF3)

[0077] - Supportable UCI payload size: more than K bits (e.g., K=2)

[0078] -Number of OFDM symbols included in one PUCCH: Y to Z symbols (e.g., Y=4 and Z=14)

[0079] -Transmission structure: UCI and DMRS are configured / mapped to different symbols based on TDM. The coded UCI bits are transmitted by applying DFT to them. To support multiplexing between multiple UEs, OCC is applied to UCI, and CS (or interleaved frequency division multiplexing (IFDM) mapping) is applied to DM-RS before DFT.

[0080] (4) PUCCH format 4 (PF4)

[0081] - Supportable UCI payload size: more than K bits (e.g., K=2)

[0082] -Number of OFDM symbols included in one PUCCH: Y to Z symbols (e.g., Y=4 and Z=14)

[0083] - Transmission structure: UCI and DMRS are configured / mapped to different symbols based on TDM. DFT is applied to the coded UCI bits without multiplexing between UEs.

[0084] Figure 4 ACK / NACK transmission processing is illustrated. Figure 4 , the UE may detect the PDCCH in time slot #n. The PDCCH includes DL scheduling information (e.g., DCI format 1_0 or DCI format 1_1). The PDCCH indicates DL assignment to PDSCH offset K0 and PDSCH to HARQ-ACK report offset K1. For example, DCI format 1_0 or DCI format 1_1 may include the following information.

[0085] - Frequency domain resource assignment: indicates the RB set assigned to PDSCH.

[0086] - Time domain resource assignment: indicates K0 and the starting position (eg, OFDM symbol index) and length (eg, number of OFDM symbols) of the PDSCH in the slot.

[0087] -PDSCH to HARQ_feedback timing indicator: indicates K1.

[0088] After receiving PDSCH in time slot #(n+K0) according to the scheduling information of time slot #n, the UE may send UCI on the PUCCH in time slot #(n+K1). The UCI includes a HARQ-ACK response to the PDSCH. In the case where the PDSCH is configured to carry a maximum of one TB, the HARQ-ACK response may be configured in one bit. In the case where the PDSCH is configured to carry up to two TBs, the HARQ-ACK response may be configured in two bits if spatial bundling is not configured, and in one bit if spatial bundling is configured. When time slot #(n+K1) is designated as the HARQ-ACK transmission timing of multiple PDSCHs, the UCI sent in time slot #(n+K1) includes HARQ-ACK responses to multiple PDSCHs.

[0089] Uplink switching of 3 or 4 uplink frequency bands

[0090] The above content can be applied in combination with the method proposed in the present disclosure (described later). Alternatively, the content can illustrate the technical features of the method proposed in the present disclosure.

[0091] In addition, the following methods can be equally applied to the above-mentioned NR system (licensed band) or shared spectrum. Therefore, it is obvious that in order to implement the technical concept of the present disclosure in the corresponding system, the terms, expressions and structures in this document can be modified to be suitable for the system.

[0092] Typically, due to the size of the UE, the number of antennas to be installed on the corresponding UE is limited. A UE with N transmission chains via N antennas can simultaneously support up to N 1-port UL transmissions or up to N-port UL transmissions. A method is needed to support UEs with limited transmission chains to effectively perform UL transmissions. In the following, an implementation of the present specification for UL transmission (Tx) switching is described. Most UEs developed to date support up to two Tx chains, so the implementation of the present specification is described below, assuming that the UE supports UL transmissions through up to two Tx chains (i.e., up to two ports). However, the implementation of the present specification is not limited to 1-port or 2-port UL transmissions, but can also be applied to N-port UL transmissions, where N can be greater than 2.

[0093] Figure 4 is a diagram illustrating the concept of UL transmission switching.

[0094] To improve the throughput and efficiency of UL transmission, NR Rel-16 provides UL Tx Switching (UTS), which switches the Tx chain connected to the UL carrier under specific conditions to enable the UE to effectively perform 1-port UL transmission or 2-port UL transmission by using up to two Tx chains. Figure 4 (a) illustrates 1Tx-2Tx switching between two carriers / bands, and Figure 4 (b) illustrates 2Tx-2Tx switching between two carriers / frequency bands.

[0095] For example, if UL transmission (hereinafter referred to as "previous transmission") is performed on carrier #1 having 1 Tx chain, and then UL transmission (hereinafter referred to as "current transmission") is configured / instructed to be performed on another carrier #2 having 2 Tx chains, the UE may switch the Tx chain connected to carrier #1 to carrier #2 to implement 2-port UL transmission on carrier #2. These UTS configuration and switching methods may be applied to band combinations corresponding to Evolved Universal Terrestrial Radio Access New Radio Dual Connectivity (EN-DC) without Supplementary UL (SUL), Independent SUL, and Inter-band CA. In NR Rel-17, additional conditions are introduced to extend the 1Tx-2Tx switching (i.e., switching between 1Tx chain and 2Tx chain) of the existing NR Rel-16 to 2Tx-2Tx switching (i.e., switching between 2Tx chain and 2Tx chain), and at the same time, the UTS between two carriers introduced in NR Rel-16 is extended to allow UTS between two different frequency bands (e.g., 1 carrier in one frequency band and 2 consecutive carriers in another frequency band).

[0096] When certain conditions are met and the UE is configured with uplinkTxSwitching via RRC signaling, the UE may ignore UL transmission during the uplink switching gap NTx1-Tx2. Tx1-Tx2All UL transmissions are ignored during this period, including UL transmissions scheduled via DCI and UL transmissions configured by higher layer signaling (e.g., configured grant-based PUSCH). When uplinkTxSwitching-2T-Mode is configured via RRC signaling, the switching gap NTx1-Tx2 may be indicated by uplinkTxSwitchingPeriod2T2T provided from the UE to the BS via the UE capability report, otherwise the switching gap NTx1-Tx2 may be indicated by uplinkTxSwitchingPeriod provided from the UE to the BS via the UE capability report. Here, the RRC configuration uplinkTxSwitching may be provided to the UE as included in the configuration about the serving cell, and may include: uplinkTxSwitchingPeriodLocation, which indicates whether the location of the UL Tx switching period is configured on the UL carrier in the case of inter-band UL CA, SUL or (NG)EN-DC; and uplinkTxSwitchingCarrier, which indicates whether the configured carrier is carrier 1 or carrier 2 for dynamic UL Tx switching. The RRC parameter uplinkTxSwitching-2T-Mode indicates that 2Tx-2Tx switching mode is configured for inter-band UL CA or SUL, in which case the switching gap duration for the triggered UL switching can be equal to the switching time capability value reported for the switching mode. When the RRC parameter uplinkTxSwitching-2T-Mode is not provided and uplinkTxSwitching is configured, it can be interpreted as 1Tx-2Tx UTS is configured, in which case there can be one UL (or one UL band in the case of intra-band) configured with uplinkTxSwitching.

[0097] When the UE indicates the capability for UL switching of a band combination and the band combination is configured to a serving cell of MCG using E-UTRA radio access and SCG using NR radio access, UL CA, or two UL carriers with a higher layer (e.g., RRC) parameter supplementaryUplink, a switching gap may exist under certain conditions. For example, the following table is taken from 3GPP TS 38.214 V17.1.0 and illustrates the UTS conditions.

[0098] When a UL switching is triggered for a UL transmission starting at T0 (which is within T0-T offset After T0-T1), the UE is not expected to perform the following operations: cancel UL switching, or offsetAny other UL transmission scheduled thereafter triggers any other new UL switching that occurs before T0, where T offset It may be the UE processing time defined for UL transmission triggered switching (e.g., see S5.3, S5.4, S6.2.1 and S6.4 of 3GPP TS 38.214 and S9 of 3GPP TS 38.213). It is not expected that the UE will UL =max(u UL,1 ,u UL,2 ) timeslot, where u UL,1 corresponds to the subcarrier spacing of the active UL BWP of one UL carrier before the switching gap, and u UL,2 The subcarrier spacing corresponding to the active ULBWP of another UL carrier after the switching gap.

[0099] [Table 5]

[0100]

[0101]

[0102] [Table 6]

[0103]

[0104]

[0105] [Table 7]

[0106]

[0107] NR supports wide spectrum across various frequency ranges. Due to the reuse of frequency bands originally used in previous generation cellular networks, it is expected that the availability of spectrum will be increased in the 5G advanced market. Especially for low-frequency FR1 bands, available spectrum blocks tend to be more segmented and more dispersed over narrower bandwidths. For FR2 bands and some FR1 bands, multi-carrier operation within the band is required because the available spectrum is to be widened. In order to meet different spectrum requirements, it is important to provide higher throughput and sufficient coverage in the network by using these dispersed spectrum bands or wider bandwidth spectrum in a more spectrum / power efficient and flexible manner. For multi-carrier UL operation, the current specification has several restrictions. For example, a 2TX UE can be configured with up to two UL bands to be changed only by RRC reconfiguration, and UL Tx switching can be performed only between two UL bands for 2Tx UEs. Instead of RRC-based cell reconfiguration, dynamically selecting a carrier with UL Tx switching based on, for example, data services, TDD DL / UL configurations, bandwidth of each band, and channel conditions may potentially lead to higher UL data rates, spectrum utilization, and UE capacity.

[0108] For higher UL data rates, spectrum utilization, and UE capacity, UTS between more than two frequency bands is currently considered. In the following, UTS triggering conditions, UTS-related configuration methods, and / or UTS operation methods required for supporting UTS between multiple frequency bands (e.g., three or more frequency bands) according to some implementations of the present specification are described.

[0109] In the following, the cell may be interpreted according to the context. For example, a cell may represent a serving cell. A cell may include one DL component carrier (CC) and 0 to 2 UL CCs, but the implementation of this specification described below is not limited to this. In the following, unless otherwise specified, the terms cell and CC may be used interchangeably. In some implementations of this specification, a cell / CC may be replaced by an (active) BWP within a serving cell. Unless otherwise specified, in the implementation of this specification described below, a cell / CC may be used as a concept covering PCell, SCell, PsCell, etc., which may be configured / expressed in a carrier aggregation (CA) / dual connection (DC) scenario.

[0110] In the following, the term "band" refers to a frequency band, and the term "band" can be used interchangeably with the term "carrier" and / or "cell" within a band. In this case, each band may include one carrier or multiple (e.g., two) contiguous (or non-contiguous) carriers. The proposed method described below can be applied to inter-band UL CA, intra-band UL CA, NR-DC, EN-DC, (standalone) SUL scenarios, and related band combinations (unless otherwise specified).

[0111] To facilitate description in the implementation of the present specification described below, the following symbols are used.

[0112] -When UTS occurs, it can be expressed as UTS triggering.

[0113] - Frequency band (or carrier) associated with UTS: This may refer to the frequency band / carrier before and after UTS occurs.

[0114] -The Tx chain switching time caused by UTS is expressed as a UTS gap (or UTS period). During the UTS gap, no UL transmission occurs in the frequency band / carrier associated with the UTS. The UTS gap (switching gap) and the UTS period (switching period) can be specifically distinguished as follows:

[0115] ■Switching period: The switching time reported by the UE. Basically, this is a band pair unit including two bands and is reported as one of the values ​​of {35us, 140us and 210us}. For specific switching cases, a single value may be reported as a band combination unit including three or more bands. In this specification, it may also be expressed as UTS period / time or switching period.

[0116] ■ Switching gap: Due to this, the duration of UL transmissions in all (or some) bands associated with a single UL Tx switching event. The switching gap can be determined as the switching period for the corresponding Tx switching (reported by the UE) or by using the switching period for each band pair associated with the corresponding Tx switching.

[0117] For example, for A(1T)+B(1T)->C(2T) switching, where transmission occurs using 2 Tx chains on band C, while 1 Tx chain is connected to band A and 1 Tx chain is connected to band B, if the UE reports the band combination {A+B, C}, the switching gap is determined as the reported value. If not reported, the switching gap may be determined as a value derived using the switching period AB (period_AB) of the band pair including band A and band B and the switching period AC (period_AC) of the band pair including band A and band C. In this specification, it may also be expressed as a UTS gap / interval or a switching interval.

[0118] - A 1Tx chain can be represented as 1T, and a 2Tx chain can be represented as 2T.

[0119] - 1-port UL transmission may be denoted as 1p, and 2-port UL transmission may be denoted as 2p.

[0120] - When 1 Tx chain or 2 Tx chains are connected to a specific frequency band A (and / or a carrier belonging to frequency band A), these states can be represented as A(1T) and A(2T), respectively.

[0121] - When 1 Tx chain is connected to each of two specific bands A (and / or carriers belonging to band A) and band B (and / or carriers belonging to band A), the state may be represented as A(1T)+B(1T).

[0122] -UL transmission can refer to any UL channel or UL signal supported by NR.

[0123] - "Previous transmission" may refer to the most recent UL transmission performed by the UE before the UTS trigger, and "Current transmission" may refer to the UL transmission performed by the UE immediately (or simultaneously) with the UTS trigger. The term "transmission" hereinafter may refer to "UL transmission".

[0124] - The expression that UL transmission occurs may mean UL transmission scheduled via DCI for UL grant and / or UL transmission configured via higher layer signaling (eg, RRC signaling) (eg, configuration of grant UL transmission).

[0125] - When 1-port UL transmission occurs in a specific frequency band A (and / or a carrier belonging to frequency band A), it can be expressed as A(1p), and when 2-port UL transmission occurs, it can be expressed as A(2p).

[0126] - When 1-port UL transmission occurs in two specific frequency bands, for example, frequency band A and frequency band B (and / or carriers belonging to the corresponding frequency bands), it can be expressed as A(1p)+B(1p).

[0127] Specific examples

[0128] When three frequency bands A, B and C are configured in the UE and UL Tx switching is configured in these frequency bands, the switching period of each frequency band pair in the frequency band pairs {A, B}, {B, C} and {A, C} can be reported (by the UE to the BS). These are denoted as period_AB, period_BC and period_AC respectively.

[0129] Case 1: For UL Tx switching of 2Tx from A to B, the switching gap may be determined as period_AB.

[0130] In the case where four frequency bands / carriers are configured (or activated), some implementations of the present specification described below are described based on UTS generation between two frequency bands. However, the same method as the implementation of the present specification described below can also be applied to UTS that occurs when a smaller number of frequency bands (e.g., 3) are configured / activated. The same method as the implementation of the present specification described below can also be applied to UTS that occurs when a larger number of frequency bands (e.g., 5) are configured / activated.

[0131] Some implementations of the present specification described below are described without distinguishing between 1Tx-2Tx switching and 2Tx-2Tx switching. However, some implementations may be particularly applicable to 1Tx-2Tx switching and / or 2Tx-2Tx switching.

[0132] In some implementations of the present specification described below, "simultaneous transmission" in multiple frequency bands may mean that the start time (e.g., start symbol) of the UL transmission in each of the multiple frequency bands coincides and / or some (or all) of the UL transmission resources / time periods in each of the multiple frequency bands overlap in time.

[0133] [1] Method for applying a switching gap when Tx switching occurs in two frequency bands due to 1-port UL transmission scheduled or configured for each of the two frequency bands

[0134] [1-1] When 1-port UL transmission occurs in each of two UL bands to which the Tx chain is not connected (or configured), the Tx chain can be switched for UL transmission in the two bands. For example, when two Tx chains are connected to other bands (or two other bands) other than band A and band B, and 1-port UL transmission occurs in band A and band B, respectively (for example, 1-port UL transmission can be scheduled via DCI for the corresponding band, or 1-port UL transmission can be configured for the corresponding band), one Tx chain can be switched to each of band A and band B.

[0135] [1-2] In NR Rel-16 / 17, Tx switching assumes operation within two frequency bands, and therefore, the existing Tx chain can be switched only within the corresponding two frequency bands. Therefore, for any existing Tx switching, the switch-to band is always 1. The switch-to band is the band to which the Tx chain in a different frequency band is switched and moved, and refers to the band to which the Tx chain is connected after Tx switching. The switch-from band is the band before the Tx chain is switched and moved, and refers to the band to which the Tx chain is connected before Tx switching. However, if Tx switching occurs for three (or four) frequency bands, there may be two switch-to bands, and Tx switching may be triggered in each of the two different frequency bands, as in the case described above in [1-1]. Therefore, depending on whether the UTS gap required for the Tx switching occurring in the two frequency bands is the same and / or whether the starting point of the UL transmission occurring in the two frequency bands is the same, the Tx switching operation and the UL transmission after the switching may be performed differently.

[0136] [1-3] When multiple UL bands are configured in the UE, if the Tx chain is switched from a specific band to another specific band, UL transmission is not allowed during the corresponding UTS gap period in the two bands. In this case, in another specific band configured in the UE, UL transmission may not be allowed during the corresponding gap period (this may be expressed as [Configuration 1]) or UL transmission may be allowed (this may be expressed as [Configuration 2]). For example, if there are band A, band B, and band C, and the Tx chain is switched from band A to band B, UL transmission is not allowed during the corresponding UTS gap period in band A as the switching source band and band B as the switching destination band. In this case, in band C and band D, UL transmission is not allowed when configuration 1 is applied, and UL transmission is allowed when configuration 2 is applied.

[0137] [1-4] When 1-port UL transmission occurs on each of two UL bands whose Tx chains are not connected (or configured) and thus UTS is triggered in both bands, if the starting point of the UL transmission in the two bands is the same, the UTS gaps applied to the UL transmission in each band may overlap each other. In this case, if the lengths of the UTS gaps configured for the two bands (or reported by the UE) are the same, the UTS gaps applied to the two bands may be the same period. However, if the lengths of the UTS gaps configured for the two bands (or reported by the UE) are different (for example, if each UTS gap is called gap_1 and gap_2), the UTS gap may be applied in one of the following two methods.

[0138] Method 1: In the case of [Configuration 1] described in [1-3], a UTS gap of length max{gap_1, gap_2} (i.e., the maximum value between gap1 and gap2) can be configured and applied as a (common UTS gap) in two frequency bands so that the UTS gaps applied to the two frequency bands can overlap with each other as much as possible.

[0139] Method 2: In the case of [Configuration 2] described in [1-3], Option 1), the UTS gap configured (or reported) for each frequency band may be applied to the corresponding frequency band. As another method, in this case, Option 2) a UTS gap of length max{gap_1, gap_2} may also be configured and applied to the corresponding two frequency bands (as a common UTS gap). As another method, in this case, whether Option 1 or Option 2 is applied in this case may be configured / indicated via RRC, MAC-CE, etc.

[0140] Method 3: In the case of [Configuration 2] described in [1-3], one of the following methods may be applied (in this case, the switching period configured or reported for each frequency band pair follows the notation of [2-3]).

[0141] The method described below is described under the assumption of "switching situation: band A (T) + band B (1T) -> band C (1P) + band D (1P)". In this case, band A / B / C / D means a switching source band or a switching destination band (i.e., a band where the Tx chain is located before Tx switching or a band where the Tx chain is located after switching) for any UL Tx switching (not a band of a specific band). In the method described below, band A / B indicates a switching source band, and band C / D indicates a switching destination band.

[0142] If the switching period is configured to apply to frequency band A and / or frequency band B, then

[0143] - Alt-1: In frequency band A, a length G1 = max{period(A, C), period(A, D)} is determined as a switching period.

[0144] - Alt-2: In the frequency band B, a length G2 = max{period(B, C), period(B, D)} is determined as a switching period.

[0145] Using the corresponding switching period, the switching period can be applied to each frequency band by using one of the following methods (or the UE can report one or more preferred methods among the following methods, and / or the UE can be configured with one of the following methods through RRC, etc.).

[0146] -Alt-1 may be applied to band A, and Alt-2 may be applied (independently) to band B. In this case, G1 or G2 may be applied (independently) to band A and band B at different timings. Alternatively, G1 may be applied to band A, and G2 may be applied to band B at the same timing (here, the same timing may mean that the starting points of G1 and G2 are the same or their end points are the same).

[0147] - The same length min{G1, G2} may be applied to band A and band B. In this case, min{G1, G2} may be applied to band A and band B at different timings (independently). Alternatively, min{G1, G2} may be applied to band A and band B at the same timing.

[0148] - The same length max{G1, G2} may be applied to band A and band B. In this case, max{G1, G2} may be applied to band A and band B at different timings (independently). Alternatively, max{G1, G2} may be applied to band A and band B at the same timing.

[0149] If the switching period is configured to apply to Band C and / or Band D, then

[0150] - Alt-3: In the frequency band C, a length G3 = max{period(A, C), period(B, C)} is determined as a switching period.

[0151] - Alt-4: In the frequency band D, a length G4 = max{period(A, D), period(B, D)} is determined as a switching period.

[0152] Using the corresponding switching period, the switching period can be applied to each frequency band by using one of the following methods (or the UE can report one or more preferred methods among the following methods, and / or the UE can be configured with one of the following methods through RRC, etc.).

[0153] -Alt-3 may be applied to band C, and Alt-4 may be applied (independently) to band D. In this case, G3 or G4 may be applied (independently) to band C and band D at different timings. Alternatively, G3 may be applied to band C, and G4 may be applied to band D at the same timing (here, the same timing may mean that the starting points of G3 and G4 are the same or their end points are the same).

[0154] - The same length min{G3, G4} may be applied to band C and band D. In this case, min{G3, G4} may be applied to band C and band D at different timings (independently). Alternatively, min{G3, G4} may be applied to band C and band D at the same timing.

[0155] - The same length max{G3, G4} may be applied to band C and band D. In this case, max{G3, G4} may be applied to band C and band D at different timings (independently). Alternatively, max{G3, G4} may be applied to band C and band D at the same timing.

[0156] [1-5] When 1-port UL transmission occurs on each of two UL bands whose Tx chains are not connected (or configured) and thus UTS is triggered in the two bands, if the transmission periods of the UL transmission in the two bands overlap with each other, one of the following methods may be used to apply the UTS gap. (In this case, when the UL transmission periods overlap with each other, this may mean that the UL transmissions of the two bands completely or partially overlap with each other. For example, (when the starting points of the UL transmissions of the two bands are different,) this may correspond to a case where the UL transmission period with a later starting point among the UL transmissions of the two bands starts before the UL transmission period with an earlier starting point ends. Alternatively, this may correspond to a case where the starting points of the UL transmissions of the two bands are the same but the lengths of the corresponding UL transmission periods are different.)

[0157] Method 1: The UTS gap may be applied to the earlier UL transmission (starting point) among the two UL transmissions, and the later UL transmission (starting point) may be discarded. Alternatively, the UE may not expect the two UL transmissions corresponding to the relationship to occur.

[0158] Method 2: The UTS gap may be applied to the earlier UL transmission (starting point) among the two UL transmissions, and the Tx chain (applied to the earlier UL transmission) may be switched in the UTS gap segment in the frequency band of the later UL transmission (starting point). That is, for the later UL transmission frequency band, the UTS gap period for switching the Tx chain may not overlap with the corresponding UL transmission period, and the gap and the corresponding UL transmission period may be separated by several symbols or more.

[0159] Method 3: If the UTS gaps (e.g., gap_1 and gap_2) configured (or reported) for each of the two frequency bands are different, a UTS gap of length "max(gap_1, gap_2)" may be applied to the two frequency bands based on the "(starting point) early UL transmission period". This method may also include a case where "max(gap_1, gap_2) = gap_1 = gap_2".

[0160] As another method, whether to apply Method 3 or another method (eg, Method 1 above) may be configured / indicated via RRC, MAC-CE, or the like.

[0161] Method 4: If the UTS gaps (e.g., gap_1 and gap_2) configured (or reported) for each of the two frequency bands are different, a UTS gap of length "max(gap_1, gap_2)" may be applied to the two frequency bands based on "(starting point) starting point of the early UL transmission period" (or "starting point of the time slot for early UL transmission"). This method may also include a case of "max(gap_1, gap_2)=gap_1=gap_2".

[0162] As another method, whether to apply method 4 or another method (eg, method 1 above) may be configured / indicated via RRC, MAC-CE, or the like.

[0163] Method 5: The UTS gaps (e.g., gap_1 and gap_2) configured (or reported) for each of the two frequency bands may be configured / applied to each frequency band to be continuous. For example, the gap_1 segment may be configured as [t_a, t_b], and the gap_2 segment may be configured as [t_b, t_c], and [t_a, t_c] may be configured / applied to appear as one continuous gap. In this case, the time point t_a (or t_b or t_c) may be configured as the starting point of the early UL transmission (starting point) among the two UL transmissions (or the starting time of the time slot of the early UL transmission). For example, if the gap_1 period to be applied to the original early UL transmission is [t_a, t_b] and the gap_2 period to be applied to the late UL transmission is [t_b+x, t_c+x], the UTS operation and UL transmission may be performed in a state where the corresponding gap_2 period is changed to [t_b, t_c] (thus changed to one continuous gap).

[0164] Method 6: (If more than two UTS triggers are allowed during one slot length) The UTS gap configured (or reported) for each of the two bands (eg, gap_1 and gap_2) may be applied independently to UL transmissions of each UL band.

[0165] In the case of [1-5], similar to method 3 of [1-4], the length of the switching period and / or the application time of the switching period can be determined according to whether the switching period is configured in the switching source frequency band or the switching destination frequency band. The following method 7 (using the same expression as [1-4]) is proposed.

[0166] Method 7: In the case of [Configuration 2] described in [1-3], one of the following methods may be applied (in this case, the switching period configured or reported for each frequency band pair follows the notation of [2-3]).

[0167] The method described below is described under the assumption of "switching situation: band A (T) + band B (1T) -> band C (1P) + band D (1P)". In this case, band A / B / C / D means a switching source band or a switching destination band (i.e., a band where the Tx chain is located before Tx switching or a band where the Tx chain is located after switching) for any UL Tx switching (not a band of a specific band). In the method described below, band A / B indicates a switching source band, and band C / D indicates a switching destination band.

[0168] If the switching period is configured to apply to frequency band A and / or frequency band B, then

[0169] - Alt-1: In frequency band A, a length G1 = max{period(A, C), period(A, D)} is determined as a switching period.

[0170] - Alt-2: In the frequency band B, a length G2 = max{period(B, C), period(B, D)} is determined as a switching period.

[0171] Using the corresponding switching period, the switching period can be applied to each frequency band by using one of the following methods (or the UE can report one or more preferred methods among the following methods, and / or the UE can be configured with one of the following methods through RRC, etc.).

[0172] -Alt-1 may be applied to band A, and Alt-2 may be applied (independently) to band B. In this case, G1 or G2 may be applied (independently) to band A and band B at different timings. Alternatively, G1 may be applied to band A, and G2 may be applied to band B at the same timing (here, the same timing may mean that the starting points of G1 and G2 are the same or their end points are the same).

[0173] - The same length min{G1, G2} may be applied to band A and band B. In this case, min{G1, G2} may be applied to band A and band B at different timings (independently). Alternatively, min{G1, G2} may be applied to band A and band B at the same timing.

[0174] - The same length max{G1, G2} may be applied to band A and band B. In this case, max{G1, G2} may be applied to band A and band B at different timings (independently). Alternatively, max{G1, G2} may be applied to band A and band B at the same timing.

[0175] If the switching period is configured to apply to Band C and / or Band D, then

[0176] - Alt-3: In the frequency band C, a length G3 = max{period(A, C), period(B, C)} is determined as a switching period.

[0177] - Alt-4: In the frequency band D, a length G4 = max{period(A, D), period(B, D)} is determined as a switching period.

[0178] Using the corresponding switching period, the switching period can be applied to each frequency band by using one of the following methods (or the UE can report one or more preferred methods among the following methods, and / or the UE can be configured with one of the following methods through RRC, etc.).

[0179] -Alt-3 may be applied to band C, and Alt-4 may be applied (independently) to band D. In this case, G3 or G4 may be applied (independently) to band C and band D at different timings. Alternatively, G3 may be applied to band C, and G4 may be applied to band D at the same timing (here, the same timing may mean that the starting points of G3 and G4 are the same or their end points are the same).

[0180] - The same length min{G3, G4} may be applied to band C and band D. In this case, min{G3, G4} may be applied to band C and band D at different timings (independently). Alternatively, min{G3, G4} may be applied to band C and band D at the same timing.

[0181] - The same length max{G3, G4} may be applied to band C and band D. In this case, max{G3, G4} may be applied to band C and band D at different timings (independently). Alternatively, max{G3, G4} may be applied to band C and band D at the same timing.

[0182] [1-6] Due to the 1-port UL transmission scheduled or configured in each of the two frequency bands, the above-mentioned proposed method may not be limited to the Tx switching case / mode, and may be applied to all Tx switching cases / modes related to two or more frequency band pairs. For example, even when switching from state A (1T) + B (1T) to state C (2T), if the switching periods reported to the frequency band pair {A, C} and the frequency band pair {B, C} are different, the switching gap corresponding to the Tx switching may be determined as the larger value (=max) of the two.

[0183] [2] Method for determining switching gap in case of Tx switching in multiple frequency band pairs reporting different switching periods

[0184] [2-1] A UE configured with UL Tx switching may report the switching period required for Tx chain switching in band pair units. For example, for four bands A, B, C, and D, the UE may report the corresponding switching periods of six band pairs (i.e., {A, B}, {A, C}, {A, D}, {B, C}, {B, D}, and {C, D}). When the Tx chain switches in some bands (or band pairs) configured in the UE, UL transmission in other bands (or band pairs) may also be restricted during the corresponding switching period. In this way, the duration of UL transmission restriction in all bands of the UE due to a specific Tx switching situation / mode may be expressed as a switching gap for the corresponding Tx switching. Therefore, if a specific Tx switching situation / mode triggers switching across multiple band pairs, and the switching periods reported for the corresponding band pairs are different, a method for determining the switching gap for the corresponding Tx switching may be required.

[0185] [2-2] In the recent RAN4 standard meeting, it was agreed that when Tx switching occurs in two frequency band pairs with different switching periods, the larger value of the two switching gaps can be the switching gap for Tx switching.

[0186] [2-3] The following expressions can be used for the following description.

[0187] - period(A, B) = switching period reported for band pair {A, B}

[0188] - period(A, C) = switching period reported for band pair {A, C}

[0189] - period(A, D) = switching period reported for band pair {A, D}

[0190] - period(B, C) = switching period reported for band pair {B, C}

[0191] - period(B, D) = switching period reported for band pair {B, D}

[0192] - period(C, D) = switching period reported for band pair {C, D}

[0193] Tx switching situation / mode: A(1T)+B(1T)->C(1T)+D(1T)

[0194] [2-4] For a UE configured for UL Tx switching in four bands (e.g., Band A, Band B, Band C, Band D), when C(1p)+D(1p) occurs in the A(1T)+B(1T) state, two Txs can be switched one by one to Band C and Band D. In this case, (depending on the UE) Tx switching can be performed in one of the following two modes.

[0195] Mode 1: When Tx of band A is switched to band C, and Tx of band B is switched to band D. In this case, a switching gap corresponding to Tx switching may be determined as Max{period(A, C), period(B, D)}.

[0196] Mode 2: When Tx of band A is switched to band D, and Tx of band B is switched to band C. In this case, a switching gap corresponding to Tx switching may be determined as Max{period(A, D), period(B, C)}.

[0197] [2-5] For Tx switching of [2-4] above, (if not configured / instructed to operate in Mode 1 or Mode 2), the UE may determine the switching gap to be one of the following:

[0198] -switching_gap1=min{Max{period(A, C), period(B, D)}, Max{period(A, D), period(B, C)}}

[0199] -switching_gap2=Max{period(A, C), period(B, D), period(A, D), period(B, C)}

[0200] Switching_gap1 may be understood as applying the minimum value among the switching gaps of each of Mode 1 and Mode 2 of [2-4] above as the switching gap corresponding to Tx switching, and switching_gap2 may be understood as applying the longest switching gap by considering all possible switching methods.

[0201] [2-5A] For Tx switching of [2-4] above, (if not configured / instructed to operate in Mode 1 or Mode 2), the UE may determine the switching gap to be one of the following:

[0202] -switching_gap1=min{Max{period(A, C), period(B, D)}, Max{period(A, D), period(B, C)}}

[0203] -switching_gap2=Max{period(A, C), period(B, D), period(A, D), period(B, C)}

[0204] -switching_gap5-a=Max{period(A,C),period(A,D)}

[0205] -switching_gap5-b=Max{period(B,C),period(B,D)}

[0206] -switching_gap5-c=min{switching_gap5-a, switching_gap5-b}

[0207] -switching_gap5-d=Max{period(A,C),period(B,C)}

[0208] -switching_gap5-e=Max{period(A,D),period(B,D)}

[0209] -switching_gap5-f=min{switching_gap5-d, switching_gap5-e}

[0210] If the switching period is configured to be applied to band A and / or band B, one of switching_gap5 - a , switching_gap5 - b , and switching_gap5 - c may be determined as the switching period.

[0211] If the switching period is configured to be applied to band C and / or band D, one of switching_gap5 - d , switching_gap5 - e , and switching_gap5 - f may be determined as the switching period.

[0212] The UE may report one (or more) of the methods from "switching_gap1" to "switching_gap5-f" listed above (as a preferred method) via a UE capability signal. The UE may be configured with one (or more) of the methods from switching_gap1 to switching_gap5-f through RRC or the like.

[0213] The switching period determined as described above may be applied to each frequency band by one of the following methods.

[0214] If the switching period is configured to apply to frequency band A and / or frequency band B, then

[0215] - Alt-1: In frequency band A, a length G1 = max{period(A, C), period(A, D)} is determined as a switching period.

[0216] - Alt-2: In the frequency band B, a length G2 = max{period(B, C), period(B, D)} is determined as a switching period.

[0217] Using the corresponding switching period, the switching period can be applied to each frequency band by using one of the following methods (or the UE can report one or more preferred methods among the following methods, and / or the UE can be configured with one of the following methods through RRC, etc.).

[0218] -Alt-1 may be applied to band A, and Alt-2 may be applied (independently) to band B. In this case, G1 or G2 may be applied (independently) to band A and band B at different timings. Alternatively, G1 may be applied to band A, and G2 may be applied to band B at the same timing (here, the same timing may mean that the starting points of G1 and G2 are the same or their end points are the same).

[0219] - The same length min{G1, G2} may be applied to band A and band B. In this case, min{G1, G2} may be applied to band A and band B at different timings (independently). Alternatively, min{G1, G2} may be applied to band A and band B at the same timing.

[0220] - The same length max{G1, G2} may be applied to band A and band B. In this case, max{G1, G2} may be applied to band A and band B at different timings (independently). Alternatively, max{G1, G2} may be applied to band A and band B at the same timing.

[0221] If the switching period is configured to apply to Band C and / or Band D, then

[0222] - Alt-3: In the frequency band C, a length G3 = max{period(A, C), period(B, C)} is determined as a switching period.

[0223] - Alt-4: In the frequency band D, a length G4 = max{period(A, D), period(B, D)} is determined as a switching period.

[0224] Using the corresponding switching period, the switching period can be applied to each frequency band by using one of the following methods (or the UE can report one or more preferred methods among the following methods, and / or the UE can be configured with one of the following methods through RRC, etc.).

[0225] Using the corresponding switching period, the switching period can be applied to each frequency band by using one of the following methods (or the UE can report one or more preferred methods among the following methods, and / or the UE can be configured with one of the following methods through RRC, etc.).

[0226] -Alt-3 may be applied to band C, and Alt-4 may be applied (independently) to band D. In this case, G3 or G4 may be applied (independently) to band C and band D at different timings. Alternatively, G3 may be applied to band C, and G4 may be applied to band D at the same timing (here, the same timing may mean that the starting points of G3 and G4 are the same or their end points are the same).

[0227] - The same length min{G3, G4} may be applied to band C and band D. In this case, min{G3, G4} may be applied to band C and band D at different timings (independently). Alternatively, min{G3, G4} may be applied to band C and band D at the same timing.

[0228] - The same length max{G3, G4} may be applied to band C and band D. In this case, max{G3, G4} may be applied to band C and band D at different timings (independently). Alternatively, max{G3, G4} may be applied to band C and band D at the same timing.

[0229] [2-6] For the Tx switching of [2-4] above, the UE may be configured to switch between mode 1 and mode 2 via RRC. If switching can be performed in mode 1 or mode 2 depending on the UE implementation, the BS may not be able to determine the switching gap corresponding to the Tx switching to be the same value as the UE. For example, if period (A, C), period (B, D), and period (A, D) are all 35usec, and period (B, C) is 210usec, it can be determined that the switching gap of mode 1 is 35usec, and the switching gap of mode 2 is 210usec. Therefore, if the BS assumes 210usec even if the UE actually switches to mode 1, or if the BS assumes 35usec even if the UE actually switches to mode 2, the switching gaps assumed by the BS and the UE may be different, which may reduce resource efficiency or cause incorrect transmission data reception.

[0230] [2-7] For the Tx switching of [2-4] above, the UE may report whether to switch between mode 1 and mode 2 through the UE capability. For example, the UE may report its possible (or preferred) method for the corresponding Tx switching in the form of {mode 1, mode 2, both}, where "both" may mean that the UE can support both mode 1 and mode 2. In this case, the UE reports "both" and / or there is no RRC configuration for the switching method (described in [2-6] above) (or before receiving the RRC configuration), and the switching gap may be determined as switching_gap1 or switching_gap2 of [2-5] above.

[0231] [2-8] For the Tx switching of [2-4] above, the UE may report the frequency band to which each Tx chain may (or may not) be connected through the UE capability. The UE may configure / receive an indication of the frequency band to which each Tx chain may (or may not) be connected via RRC, etc. When the UE reports that a specific Tx chain may be connected to all frequency bands and / or there is no RRC configuration for whether each Tx chain may be connected to a frequency band (or before receiving the RRC configuration), the switching gap may be determined as switching_gap1 or switching_gap2 of [2-5] above.

[0232] Tx switching situation / mode: A(1T)+B(1T)->A(1T)+C(1T) or A(1T)+B(1T)->B(1T)+C(1T)

[0233] [2-9] For a UE configured for UL Tx switching in three or four frequency bands (e.g., band A, band B, band C, and band D), when X(1p)+C(1p) occurs in the A(1T)+B(1T) state (X represents A or B). ) Depending on the UE, Tx switching can be performed in one of the following two modes. (Description is given assuming that X=B)

[0234] Mode 3: When Tx of band A is switched to band C, and Tx of band B is maintained in band B. In this case, a switching gap corresponding to Tx switching may be determined as period (A, C).

[0235] Mode 4: When Tx of band A is switched to band B, and Tx of band B is switched to band C. In this case, a switching gap corresponding to Tx switching may be determined as Max{period(A, B), period(B, C)}.

[0236] To further illustrate, if one of the UE's Tx chains (=Tx#1) can be connected to band A and band B but not to band C, and the other Tx chain (=Tx#2) can be connected to band B and band C, and if the A(1T)+B(1T) state is a state in which Tx#1 is connected to band A and Tx#2 is connected to band B, the UE can perform the corresponding Tx switching in mode 4.

[0237] [2-10] For the Tx switching of [2-9] above, (if not configured / instructed to operate in Mode 3 or Mode 4), the UE may determine the switching gap as one of the following:

[0238] -switching_gap3=min{period(A,C),Max{period(A,B),period(B,C)}}

[0239] -switching_gap4=Max{period(A,C), period(A,B), period(B,C)}

[0240] Switching_gap3 may be understood as applying the minimum value among the switching gaps of each of Mode 3 and Mode 4 of the above [2-9] as the switching gap corresponding to Tx switching, and switching_gap4 may be understood as applying the longest switching gap by considering all possible switching methods.

[0241] [2-10A] For the Tx switching of [2-9] above, (if not configured / instructed to operate in mode 3 or mode 4), the UE may determine the switching gap as one of the following. (The description is given assuming X=B, i.e., assuming the case A(1T)+B(1T)->B(1T)+C(1T). If X=A, the same principle may be applied by exchanging A and B in the following method of determining switching_gap.)

[0242] -switching_gap3=min{period(A,C),Max{period(A,B),period(B,C)}}

[0243] -switching_gap4=Max{period(A,C), period(A,B), period(B,C)}

[0244] -switching_gap6-a=Max{period(A,C),period(A,B)}

[0245] -switching_gap6-b=period(B,C)

[0246] -switching_gap6-c=min{switching_gap6-a, switching_gap6-b}

[0247] -switching_gap6-d=Max{period(A,C),period(B,C)}

[0248] -switching_gap6-e=period(A,B)

[0249] -switching_gap6-f=min{switching_gap6-d, switching_gap6-e}

[0250] If the switching period is configured to be applied to the switching source band (ie, band A and / or band B), one of switching_gap6 - a , switching_gap6 - b , and switching_gap6 - c may be determined as the switching period.

[0251] If the switching period is configured to be applied to the switching destination frequency band (ie, band B and / or band C), one of switching_gap6 - d , switching_gap6 - e , and switching_gap6 - f may be determined as the switching period.

[0252] The UE may report one (or more) of the methods from "switching_gap3" to "switching_gap6-f" listed above (as a preferred method) via a UE capability signal. The UE may be configured with one (or more) of the methods from switching_gap3 to switching_gap6-f through RRC or the like.

[0253] The switching period determined as described above may be applied to each frequency band by one of the following methods.

[0254] If the switching period is configured to be applied to the switching source frequency band (ie, frequency band A and / or frequency band B), then

[0255] - Alt-1: In the frequency band A, a length G1 = max{period(A, C), period(A, B)} is determined as a switching period.

[0256] - Alt-2: In frequency band B, a length G2 = period (B, C) is determined as a switching period.

[0257] Using the corresponding switching period, the switching period can be applied to each frequency band by using one of the following methods (or the UE can report one or more preferred methods among the following methods, and / or the UE can be configured with one of the following methods through RRC, etc.).

[0258] -Alt-1 may be applied to band A, and Alt-2 may be applied (independently) to band B. In this case, G1 or G2 may be applied (independently) to band A and band B at different timings. Alternatively, G1 may be applied to band A, and G2 may be applied to band B at the same timing (here, the same timing may mean that the starting points of G1 and G2 are the same or their end points are the same).

[0259] - The same length min{G1, G2} may be applied to band A and band B. In this case, min{G1, G2} may be applied to band A and band B at different timings (independently). Alternatively, min{G1, G2} may be applied to band A and band B at the same timing.

[0260] - The same length max{G1, G2} may be applied to band A and band B. In this case, max{G1, G2} may be applied to band A and band B at different timings (independently). Alternatively, max{G1, G2} may be applied to band A and band B at the same timing.

[0261] If the switching period is configured to be applied to the switching destination frequency band (ie, frequency band B and / or frequency band C), then

[0262] Alt-3: In the frequency band C, a length G3 = max{period(A, C), period(B, C)} is determined as a switching period.

[0263] Alt-4: In the frequency band B, a length G4 = period (A, B) is determined as a switching period.

[0264] Using the corresponding switching period, the switching period can be applied to each frequency band by using one of the following methods (or the UE can report one or more preferred methods among the following methods, and / or the UE can be configured with one of the following methods through RRC, etc.).

[0265] -Alt-3 may be applied to band C, and Alt-4 may be applied (independently) to band D. In this case, G3 or G4 may be applied (independently) to band C and band D at different timings. Alternatively, G3 may be applied to band C, and G4 may be applied to band D at the same timing (here, the same timing may mean that the starting points of G3 and G4 are the same or their end points are the same).

[0266] - The same length min{G3, G4} may be applied to band C and band D. In this case, min{G3, G4} may be applied to band C and band D at different timings (independently). Alternatively, min{G3, G4} may be applied to band C and band D at the same timing.

[0267] - The same length max{G3, G4} may be applied to band C and band D. In this case, max{G3, G4} may be applied to band C and band D at different timings (independently). Alternatively, max{G3, G4} may be applied to band C and band D at the same timing.

[0268] Using the corresponding switching period, the switching period can be applied to each frequency band by using one of the following methods (or the UE can report one or more preferred methods among the following methods, and / or the UE can be configured with one of the following methods through RRC, etc.).

[0269] -Alt-3 may be applied to band C, and Alt-4 may be applied (independently) to band D. In this case, G3 or G4 may be applied (independently) to band C and band D at different timings. Alternatively, G3 may be applied to band C, and G4 may be applied to band D at the same timing (here, the same timing may mean that the starting points of G3 and G4 are the same or their end points are the same).

[0270] - The same length min{G3, G4} may be applied to band C and band D. In this case, min{G3, G4} may be applied to band C and band D at different timings (independently). Alternatively, min{G3, G4} may be applied to band C and band D at the same timing.

[0271] - The same length max{G3, G4} may be applied to band C and band D. In this case, max{G3, G4} may be applied to band C and band D at different timings (independently). Alternatively, max{G3, G4} may be applied to band C and band D at the same timing.

[0272] [2-11] For the Tx switching of [2-9] above, the UE may be configured to switch between mode 3 and mode 4 via RRC. If switching can be performed in mode 3 or mode 4 depending on the UE implementation, the BS may not be able to determine the switching gap corresponding to the Tx switching as the same value as the UE. For example, if period (A, C) is 35usec, and period (A, B) and period (B, C) are 210usec, the switching gap of mode 3 may be determined as 35usec, and the switching gap of mode 4 may be determined as 210usec. Therefore, if the BS assumes 210usec even if the UE actually switches to mode 3, or if the BS assumes 35usec even if the UE actually switches to mode 4, the switching gaps assumed by the BS and the UE may be different, which may reduce resource efficiency or cause incorrect transmission data reception.

[0273] [2-12] For the Tx switching of [2-9] above, the UE may report whether to switch between mode 3 and mode 4 through the UE capability. For example, the UE may report its possible (or preferred) method for the corresponding Tx switching in the form of {mode 3, mode 4, both}, where "both" may mean that the UE can support both mode 3 and mode 4. In this case, the UE reports "both" and / or there is no RRC configuration for the switching method (described in [2-11] above) (or before receiving the RRC configuration), and the switching gap may be determined as switching_gap3 or switching_gap4 of [2-10] above.

[0274] [2-13] For the Tx switching of [2-9] above, the UE may report the frequency band to which each Tx chain may (or may not) be connected through the UE capability. The UE may configure / receive an indication of the frequency band to which each Tx chain may (or may not) be connected via RRC, etc. When the UE reports that a specific Tx chain may be connected to all frequency bands and / or there is no RRC configuration for whether each Tx chain may be connected to a frequency band (or before receiving the RRC configuration), the switching gap may be determined as switching_gap3 or switching_gap4 of [2-10] above.

[0275] The calculation principle of switching_gap1 of [2-5] (or switching_gap3 of [2-10]) is not limited to the Tx switching situation / mode of [2-4] (or [2-9]) above. That is, if two or more frequency band pairs reported with different switching periods are included in one switching situation / mode (as in [2-4] and [2-9] above), and the corresponding Tx switching can be operated in two or more modes, then in this case, the switching gap can be determined as the minimum value among the switching gaps of each operation mode.

[0276] Alternatively, the calculation principle of switching_gap2 of [2-5] (or switching_gap4 of [2-10]) is not limited to the Tx switching case / mode of [2-4] (or [2-9]) above. That is, if two or more frequency band pairs reported with different switching periods are included in one switching case / mode (as in [2-4] and [2-9] above), and the corresponding Tx switching can be operated in two or more modes, then in this case, the switching gap can be determined as the maximum value among the switching gaps of each operation mode.

[0277] [3] Method for limiting continuous UL Tx switching in a switching pair unit for a specific time period

[0278] [3-1] The following is one of the UL Tx switching related characteristics defined in 38.214.

[0279] [Table 8]

[0280]

[0281] That is, the UE may not expect more than two UTS triggers to occur during one time slot length. In this case, one time slot is determined based on the SCS configured in the active UL BWP of the two UL carriers (or frequency bands) before and after the UTS switching.

[0282] [3-2] The content of the above Table 8 specifies that when the number of frequency bands configured for UL Tx switching in the UE is 2, 2 UTSs may be triggered discontinuously during one time slot. When the number of frequency bands configured for UL Tx switching in the UE is three or more, the following is ambiguous: for all frequency bands configured for UTS (i.e., three or more frequency bands), whether any UTS may be triggered discontinuously for one time slot, or for two frequency bands for which UTS is triggered (i.e., a switching source frequency band and a switching destination frequency band), whether two UTSs may be triggered discontinuously for one time slot.

[0283] [3-3] As described above, the constraint that continuous UTS may not be triggered during one time slot may be operated in the following two ways.

[0284] -Alt1: For any (two) frequency bands configured in the UTS, the UE may not expect any UTS to be triggered continuously for one time slot. For example, when three frequency bands (e.g., band A, band B, and band C) are configured in the UTS, after the UTS is triggered between specific two frequency bands during one time slot, the UTS is not triggered between the same or different specific two frequency bands. In this case, the time slot means a time slot whose length corresponds to the maximum (or minimum) value of the SCS of the active UL BWP of all UL frequency bands (or UL carriers) configured in the UTS.

[0285] -Alt2: For the same specific two frequency bands, the UE may not expect that UTS is continuously triggered for one time slot. For example, when three frequency bands (e.g., band A, band B, and band C) are configured in UTS, after UTS is triggered between the specific two frequency bands during one time slot, UTS is not triggered between the same specific two frequency bands. However, UTS may be triggered between the specific two frequency bands, and UTS may be triggered between other combinations of the two frequency bands before one time slot elapses. In this case, the time slot means a time slot whose length corresponds to the maximum (or minimum) value of the SCS of the active UL BWP of the specific two UL frequency bands (or UL carriers).

[0286] The UE may report one of Alt1 and Alt2 as the UE capability to the BS (if three or more frequency bands are configured for UTS). The BS may configure / instruct the UE to select one of Alt1 and Alt2 (based on the UE capability of the UE) via RRC or MAC-CE.

[0287] [3-4] Alt1 and Alt2 of [3-3] above may be applied only under certain conditions. For example, Alt1 (or Alt2) may be applied only when [Configuration 1] or [Configuration 2] is described in [1-3]. Alternatively, Alt1 or Alt2 may be applied only when two Tx chains are switched. For example, if 1-port UL transmission occurs in each of two UL bands to which the Tx chains are not connected (or configured) (or, if 2-port UL transmission occurs in one UL band to which the Tx chains are not connected (or configured)), it may be necessary to switch the two Tx chains, and a configuration that does not allow continuous UTS triggering during one time slot may be defined / configured because such switching does not occur continuously during one time slot.

[0288] The content of the present disclosure is not limited to the transmission and reception of UL and / or DL ​​signals. For example, the content of the present disclosure can also be used for direct communication between UEs. The BS in the present disclosure can be a concept that includes not only a BS but also a relay node. For example, the operation of the BS in the present disclosure can be performed by the BS, but can also be performed by a relay node.

[0289] Obviously, the example of the above-mentioned proposed method can also be included as one of the implementation methods of the present disclosure, and can therefore be considered as a proposed method. The above-mentioned proposed method can be implemented independently, but can also be implemented in the form of a combination (or merger) of some proposed methods. Rules can be defined so that information about whether the proposed method is applicable (or information about the rules of the proposed method) is reported by the BS to the UE via a predefined signal (e.g., a physical layer signal or a higher layer signal) or by the receiving UE to the receiving UE.

[0290] Implementation Example

[0291] Figure 5 is a flowchart of a signal sending and receiving method according to an embodiment of the present disclosure.

[0292] Reference Figure 5 , the signal transmission and reception method according to the embodiment of the present disclosure may be performed by a UE, and may include: indicating a capability for a switching period (S501), and performing a second transmission after performing a first transmission (S503). Figure 5 A signal transmission and reception method performed by a BS corresponding to an embodiment of the present disclosure may include: receiving an indication of a capability for a switching period (S501), and receiving a second transmission after receiving a first transmission from a UE (S503).

[0293] Apart from Figure 5 In addition to the operations described in Sections [1] to [3], one or more operations may be performed.

[0294] For example, referring to sections [1-1] to [1-4], when two Tx chains are connected in a specific frequency band, 1-port UL transmission may occur in each of the two frequency bands in which the Tx chains are not connected. If the time lengths of the UTS gaps applied to the two frequency bands in which the 1-port uplink transmission occurs are different, the maximum value of the two UTS gaps may be applied to both frequency bands.

[0295] If a specific frequency band to which two Tx chains are connected is called frequency band A, and two frequency bands in which 1-port UL transmission occurs are respectively called frequency band B and frequency band C, the capabilities indicated in operation S501 may include information about a switching period AB of a frequency band pair including frequency band A and frequency band B, and information about a switching period AC of a frequency band pair including frequency band A and frequency band C. The first transmission corresponds to a 2-port transmission performed on a carrier of frequency band A, and the second transmission corresponds to a 1-port transmission performed on each carrier of frequency band B and frequency band C. UL switching occurs, wherein the Tx chain is changed due to a frequency band change between the first transmission and the second transmission, and during a switching gap for UL switching, the first transmission and the second transmission are ignored. Referring to the method in section [1-4], the switching gap may be configured and applied as the maximum value of the switching periods AB and AC.

[0296] Figure 6 The switching period associated with UL switching between three frequency bands according to an embodiment of the present disclosure is illustrated. Specifically, it represents the switching time mask when the UE supports 'dualUL' for a band pair including bands X and Y. The RRC parameter uplinkTxSwitchingOption provided by the BS to the UE may indicate which option is configured for dynamic UL Tx switching of inter-band UL CA or (NG) EN-DC. This RRC parameter is configured as swtichedUL when the network configures option 1, and is configured as dualUL when the network configures option 2. When the UE receives an RRC value configured as "swtichedUL", the UE does not expect / perform 1 Tx chain connected to each of the two bands, or does not expect / perform simultaneous transmission on the two bands (indication / configuration), even if 1 Tx chain is connected to each of them. In the following, this is represented as the configured option 1 operation. For example, a UE configured with swtichedUL may not expect to indicate / configure simultaneous transmission of A(1T) and B(1T), and the BS may not indicate / configure simultaneous transmission of A(1T) and B(1T) to the UE. If the UE receives an RRC value configured as "dualUL", the UE may expect to schedule / configure (or perform) simultaneous transmission on two frequency bands through 1 Tx chain connected to the two frequency bands, respectively, and this is represented as the Option 2 operation configured below.

[0297] Reference Figure 6 , for Band Z, two transmit antenna connectors are supported. In this specification, transmit antenna connector and transmitter represent a transmit chain. Parts represented as Tx chain and Tx in this specification can be replaced by transmit antenna connector, transmitter or transmit chain. Figure 6 The frequency band Z in the example corresponds to Figure 5 Described frequency band A, Figure 6 The frequency band X in corresponds to the frequency band B in the implementation example, and Figure 6 The frequency band Y in corresponds to the frequency band C in the implementation example. One transmitter is switched between frequency band X and frequency band Z, and the other transmitter is switched between frequency band Y and frequency band Z at the same time. If the length of the switching period (same as the switching period AB) of the frequency band pair including frequency band X and frequency band Z is T2, and the length of the switching period (same as the switching period AC) of the frequency band pair including frequency band Y and frequency band Z is T3, then during the duration corresponding to the larger value of T2 and T3, UL transmission of the UE is not required in any frequency band of frequency band X, frequency band Y, and frequency band Z. (As a baseline UE behavior, the UE does not need to transmit on any of the three bands during the larger of the switching periods T2 and T3, where T2 is the length of the switching period for the band pair of bands X and band Z, and T3 is the length of the switching period for the band pair of bands Y and band Z.) Although it is expressed that the UE's UL transmission is not required in any of bands X, Y, and Z, based on the priorities of the three bands, the duration (switching gap) corresponding to the larger of T2 and T3 may be located only in the switching source band or only in the switching destination band. Therefore, the transmission actually skipped during the duration corresponding to the larger of T2 and T3 may be UL transmission on bands X and band Y or UL transmission on band Z.

[0298] Referring to section [2-5A], after performing 1-port transmission on each carrier of frequency band A and frequency band B, the UE can perform 1-port transmission on each carrier of frequency band C and frequency band D. Figure 5 For example, the first transmission corresponds to 1-port transmission on each carrier of band A and band B, and the second transmission corresponds to 1-port transmission on each carrier of band C and band D. One transmitter may be switched between band A and band C, and the other transmitter may be switched between band B and band D. One transmitter may be switched between band A and band D, and the other transmitter may be switched between band B and band C.

[0299] In section [2-5A], the handover gap is determined by considering two cases. For example, if the handover gap is located in the handover source band, G1 is determined as the maximum value among the handover period AC and the handover period AD based on band A, and G2 is determined as the maximum value among the handover period BC and the handover period BD based on band B. G1 and G2 may be applied independently to their respective bands, or the maximum value or the minimum value of G1 and G2 may be applied to band A and band B in common. For another example, if the handover gap is located in the handover destination band, G3 is determined as the maximum value among the handover period AC and the handover period BC based on band C, and G4 is determined as the maximum value among the handover period AD and the handover period BD based on band D. G3 and G4 may be applied independently to their respective bands, or the maximum value or the minimum value of G3 and G4 may be applied to band C and band D in common. Before performing the first transmission, the UE may indicate the handover capability for the handover period AC, the handover period AD, the handover period BC, and the handover period BD.

[0300] Referring to section [2-10A], after performing 1-port transmission on each carrier of band A and band B, the UE can perform 1-port transmission on each carrier of band B and band C. Figure 5 For example, the first transmission corresponds to 1-port transmission on each carrier of band A and band B, and the second transmission corresponds to 1-port transmission on each carrier of band B and band C. One transmitter may be switched between band A and band B, and the other transmitter may be switched between band B and band C. One transmitter may be switched between band A and band C, and the other transmitter may be maintained in band B without switching.

[0301] In section [2-10A], the switching gap is determined by considering two cases. For example, if the switching gap is located in the switching source band, G1 is determined as the maximum value among the switching period AB and the switching period AC based on band A. When the transmitter is kept in band B, there is no need to consider the switching period, and therefore, G2 determined based on band B is determined as the value of the switching period BC. G1 and G2 may be applied independently to their respective bands, or the maximum or minimum value of G1 and G2 may be applied to band A and band B in common. For another example, if the switching gap is located in the switching destination band, G3 is determined as the maximum value among the switching period AC and the switching period BC based on band C. When the transmitter is kept in band B, there is no need to consider the switching period, and therefore, G4 determined based on band B is determined as the value of the switching period BC. G3 and G4 may be applied independently to their respective bands, or the maximum or minimum value of G3 and G4 may be applied to band B and band C in common. Before performing the first transmission, the UE may indicate the switching capability for the switching period AB, the switching period AC, and the switching period BC.

[0302] Then, referring to Section [1-5], when two Tx chains are connected in a specific frequency band, 1-port UL transmission may occur in each of the two frequency bands to which the Tx chains are not connected. If the starting points of the 1-port uplink transmission are different, the switching gap may be determined based on the transmission with the earlier starting point.

[0303] If the specific frequency band to which the two Tx chains are connected is called frequency band C, and the two frequency bands in which 1-port UL transmission occurs are respectively called frequency band A and frequency band B, the capabilities indicated in operation S501 may include information about a switching period BC of a frequency band pair including frequency band A and frequency band C, and information about a switching period BC of a frequency band pair including frequency band B and frequency band C. The first transmission corresponds to a 2-port transmission performed on a carrier of frequency band C, and the second transmission corresponds to a 1-port transmission performed on each carrier of frequency band A and frequency band B. UL switching occurs, wherein the Tx chain is changed due to a frequency band change between the first transmission and the second transmission, and during a switching gap for UL switching, the first transmission and the second transmission are ignored. Referring to the method of section [1-5], the switching gap may be a switching period associated with a previous transmission in the time domain during the 1-port transmission on each carrier of frequency band A and frequency band B during the switching period AC and the switching period BC (method 2 of [1-5]). The switching gap may be configured for a time period corresponding to a maximum value of the switching period AC and the switching period BC from the starting point of the previous transmission in the time domain during the 1-port transmission on each carrier of the frequency band A and the frequency band B (method 4 of [1-5]). The switching gap may be configured for a time period equal to the sum of the length of the switching period BC and the length of the switching period AC from the starting point of the previous transmission in the time domain during the 1-port transmission on each carrier of the frequency band A and the frequency band B (method 5 of [1-5]).

[0304] In addition to about Figure 5 and Figure 6 In addition to the operations described above, additional operations may be performed in combination with Figures 1 to 4 The operations described and / or one or more of the operations described in sections [1] to [3].

[0305] Example of a communication system to which the present disclosure is applied

[0306] The various descriptions, functions, processes, proposals, methods and / or operational flowcharts of the present disclosure described herein may be applied to, but not limited to, various fields requiring wireless communication / connection between devices (e.g., 5G).

[0307] More specific examples will be described below with reference to the accompanying drawings.In the following drawings / descriptions, unless otherwise specified, the same reference numerals represent the same or corresponding hardware blocks, software blocks or functional blocks.

[0308] Figure 7 A communication system 1 applied to the present disclosure is illustrated.

[0309] refer to Figure 7 , the communication system 1 applied to the present disclosure includes a wireless device, a BS, and a network. The wireless device is a device that performs communication using a radio access technology (RAT) (e.g., 5G NR (or new RAT) or LTE), also referred to as a communication / radio / 5G device. The wireless device may include (but is not limited to) a robot 100a, a vehicle 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an IoT device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous driving vehicle, and a vehicle capable of vehicle-to-vehicle (V2V) communication. In this article, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device, and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a television (TV), a smart phone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, etc. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., laptop computers). Home appliances may include TVs, refrigerators, washing machines, etc. IoT devices may include sensors, smart meters, etc. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node for other wireless devices.

[0310] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. The AI ​​technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without the intervention of the BS / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., V2V / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0311] Wireless communication / connection 150a, 150b and 150c can be established between wireless devices 100a to 100f / BS200 and between BS200. Herein, wireless communication / connection can be established through various RATs (e.g., 5G NR) such as UL / DL communication 150a, side link communication 150b (or D2D communication) or inter-BS communication (e.g., relay or integrated access backhaul (IAB)). Wireless signals can be sent and received between wireless devices, between wireless devices and BSs, and between BSs through wireless communication / connection 150a, 150b and 150c. For example, signals can be sent and received via various physical channels through wireless communication / connection 150a, 150b and 150c. To this end, at least a portion of various configuration information for configuring processes for sending / receiving wireless signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation and resource mapping / demapping) and resource allocation processes can be performed based on various proposals of the present disclosure.

[0312] Example of wireless device to which the present disclosure is applied

[0313] Figure 8 A wireless device suitable for use with the present disclosure is shown.

[0314] Reference Figure 8 , the first wireless device 100 and the second wireless device 200 may transmit wireless signals through various RATs (e.g., LTE and NR). {The first wireless device 100 and the second wireless device 200} may correspond to Figure 7 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0315] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and also include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106, and may be configured to implement the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processor 102 may process the information in the memory 104 to generate first information / signals, and then transmit a wireless signal including the first information / signals through the transceiver 106. The processor 102 may receive a wireless signal including second information / signals through the transceiver 106, and then store information obtained by processing the second information / signals in the memory 104. The memory 104 may be connected to the processor 102, and may store various information related to the operation of the processor 102. For example, the memory 104 may store software codes including instructions for executing all or part of the processing controlled by the processor 102 or for executing the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. The processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive wireless signals through one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, the wireless device may be a communication modem / circuit / chip.

[0316] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and also include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206, and may be configured to implement the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processor 202 may process the information in the memory 204 to generate third information / signals, and then transmit a wireless signal including the third information / signals through the transceiver 206. The processor 202 may receive a wireless signal including fourth information / signals through the transceiver 106, and then store information obtained by processing the fourth information / signals in the memory 204. The memory 204 may be connected to the processor 202 and store various information related to the operation of the processor 202. For example, the memory 204 may store software codes including instructions for executing all or part of the processing controlled by the processor 202 or for executing the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. The processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive wireless signals through one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, a wireless device may be a communication modem / circuit / chip.

[0317] Now, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by (but not limited to) one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as physical (PHY), medium access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), RRC, and service data adaptation protocol (SDAP)). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document, and provide these messages, control information, data, or information to one or more transceivers 106 and 206. One or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document, and provide the generated signal to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document.

[0318] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software or a combination thereof. For example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs) or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The description, function, process, proposal, method and / or operation flow chart disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes or functions. Firmware or software configured to execute the description, function, process, proposal, method and / or operation flow chart disclosed in this document may be included in one or more processors 102 and 202 or may be stored in one or more memories 104 and 204 and driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods and / or operational flow charts disclosed in this document may be implemented in the form of codes, instructions and / or instruction sets using firmware or software.

[0319] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions and / or commands. One or more memories 104 and 204 may be configured to include read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, register, cache memory, computer-readable storage medium and / or a combination thereof. One or more memories 104 and 204 may be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 by various technologies such as wired or wireless connections.

[0320] One or more transceivers 106 and 206 can send the user data, control information and / or wireless signal / channel mentioned in the method and / or operation flow chart of this document to one or more other devices. One or more transceivers 106 and 206 can receive the user data, control information and / or wireless signal / channel mentioned in the description, function, process, proposal, method and / or operation flow chart disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 can be connected to one or more processors 102 and 202 and send and receive wireless signals. For example, one or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can send user data, control information or wireless signal to one or more other devices. One or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can receive user data, control information or wireless signal from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information, and / or radio signals / channels mentioned in the description, functions, processes, proposals, methods, and / or operational flow charts disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert the received wireless signals / channels from RF band signals to baseband signals so as to process the received user data, control information, and wireless signals / channels using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert the user data, control information, and wireless signals / channels processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0321] Example of use of wireless device to which the present disclosure is applied

[0322] Fig. 9 Another example of a wireless device applicable to the present disclosure is shown. The wireless device can be based on the use case / service (refer to Figure 7 ) are implemented in various forms.

[0323] Reference Fig. 9 , the wireless devices 100 and 200 may correspond to Figure 8The wireless devices 100 and 200 may be configured to include various elements, components, units / parts and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130 and an additional component 140. The communication unit 110 may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include Figure 8 The one or more processors 102 and 202 and / or the one or more memories 104 and 204 of the present invention. For example, the transceiver 114 may include Figure 8 The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and provides overall control of the wireless device. For example, the control unit 120 can control the electrical / mechanical operation of the wireless device based on the program / code / instruction / information stored in the memory unit 130. The control unit 120 can send information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 in the memory unit 130 through a wireless / wired interface.

[0324] The additional component 140 may be configured in various ways depending on the type of wireless device. For example, the additional component 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured in the form of, but not limited to, a robot ( Figure 7 100a), vehicles ( Figure 7 100b-1 and 100b-2), XR devices ( Figure 7 100c), handheld device ( Figure 7 100d), household appliances ( Figure 7 100e), IoT devices ( Figure 7 100f), digital broadcasting terminal, holographic device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Figure 7 400), BS( Figure 7 200), network nodes, etc. Depending on the use case / service, the wireless device can be mobile or fixed.

[0325] exist Fig. 9In the wireless devices 100 and 200, various elements, components, units / parts and / or modules in the wireless devices 100 and 200 may all be connected to each other through a wired interface, or at least a part thereof may be wirelessly connected through the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be wired, and the control unit 120 and the first unit (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. The various elements, components, units / parts and / or modules in the wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured using a collection of one or more processors. For example, the control unit 120 may be configured using a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit and a memory control processor. In another example, the memory 130 may be configured using RAM, dynamic RAM (DRAM), ROM, flash memory, volatile memory, non-volatile memory and / or a combination thereof.

[0326] Examples of vehicles or autonomous driving vehicles to which the present disclosure is applied

[0327] Fig.10 A vehicle or an autonomous vehicle applied to the present disclosure is shown. The vehicle or the autonomous vehicle can be implemented as a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0328] Reference Fig.10 , the vehicle or autonomous driving vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to Fig. 9 Block 110 / 130 / 140.

[0329] The communication unit 110 may send and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or autonomous driving vehicle 100. The control unit 120 may include an ECU. The drive unit 140a may enable the vehicle or autonomous driving vehicle 100 to travel on a road. The drive unit 140a may include an engine, a motor, a power system, wheels, brakes, a steering device, etc. The power supply unit 140b may supply power to the vehicle or autonomous driving vehicle 100, and include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c may acquire information about the vehicle status, surrounding environment information, user information, etc. The sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement a technology for maintaining a lane in which the vehicle is traveling, a technology for automatically adjusting a speed (e.g., adaptive cruise control), a technology for autonomously traveling along a determined path, a technology for traveling by automatically setting a route if a destination is set, and the like.

[0330] For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving route and a driving plan from the obtained data. The control unit 120 may control the drive unit 140a so that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving route according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit 110 may aperiodically / periodically obtain the latest traffic information data from an external server and obtain surrounding traffic information data from neighboring vehicles. During autonomous driving, the sensor unit 140c may obtain information about the vehicle state and / or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving route and driving plan based on the newly obtained data / information. The communication unit 110 may transmit information about the vehicle position, autonomous driving route, and / or driving plan to an external server. The external server may predict traffic information data using AI technology based on information collected from the vehicle or autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0331] Those skilled in the art will appreciate that the present disclosure may be implemented in other specific ways than those described herein without departing from the spirit and basic characteristics of the present disclosure. Therefore, the above-described embodiments are to be interpreted as illustrative in all respects, rather than restrictive. The scope of the present disclosure should be determined by the appended claims and their legal equivalents (rather than the above description), and all changes falling within the meaning and equivalent scope of the appended claims are intended to be included therein.

[0332] Industrial Applicability

[0333] As described above, the present disclosure is applicable to various wireless communication systems.

Claims

1. A method for sending and receiving signals by a user equipment UE in a wireless communication system, the method comprising the following steps: Indicating a capability for a switching period AB for a frequency band pair including frequency band A and frequency band B and a switching period AC for a frequency band pair including said frequency band A and frequency band C; as well as performing 2-port transmission on a carrier of the frequency band A, and then performing 1-port transmission on each of the carriers of the frequency band B and the frequency band C, wherein, during an uplink UL switching gap, the 2-port transmission on the carrier of the frequency band A or the 1-port transmission on each carrier of the frequency band B and the frequency band C is ignored, and The UL switching gap is a maximum value between the switching period AB and the switching period AC.

2. The method according to claim 1, further comprising the steps of: indicating capabilities for the switching period AC, the switching period AD of the frequency band pair including the frequency band A and the frequency band D, the switching period BC of the frequency band pair including the frequency band B and the frequency band C, and the switching period BD of the frequency band pair including the frequency band B and the frequency band D; as well as performing 1-port transmission on each carrier of the frequency band A and the frequency band B, and then performing 1-port transmission on each carrier of the frequency band C and the frequency band D, Wherein, based on the second UL switching gap being located in the switching source frequency band including the frequency band A and the frequency band B, the 1-port transmission on each carrier of the frequency band A and the frequency band B during the second UL switching gap is ignored, The second UL switching gap is the maximum value or the minimum value between G1 and G2. The G1 is the maximum value of the switching period AC and the switching period AD, and The G2 is the maximum value of the switching period BC and the switching period BD.

3. The method according to claim 1, further comprising the steps of: indicating capabilities for the switching period AC, the switching period AD of the frequency band pair including the frequency band A and the frequency band D, the switching period BC of the frequency band pair including the frequency band B and the frequency band C, and the switching period BD of the frequency band pair including the frequency band B and the frequency band D; as well as performing 1-port transmission on each carrier of the frequency band A and the frequency band B, and then performing 1-port transmission on each carrier of the frequency band C and the frequency band D, Wherein, based on the second UL switching gap being located in the switching source frequency band including the frequency band A and the frequency band B, the 1-port transmission on each carrier of the frequency band A and the frequency band B during the second UL switching gap is ignored, As the second UL switching gap, G1 is used for the frequency band A, and G2 is used for the frequency band B, The G1 is the maximum value of the switching period AC and the switching period AD, and The G2 is the maximum value of the switching period BC and the switching period BD.

4. The method according to claim 1, further comprising the steps of: indicating capabilities for the switching period AC, the switching period AD of the frequency band pair including the frequency band A and the frequency band D, the switching period BC of the frequency band pair including the frequency band B and the frequency band C, and the switching period BD of the frequency band pair including the frequency band B and the frequency band D; as well as performing 1-port transmission on each carrier of the frequency band A and the frequency band B, and then performing 1-port transmission on each carrier of the frequency band C and the frequency band D, Wherein, based on the second UL switching gap being located in the switching destination frequency band including the frequency band C and the frequency band D, the 1-port transmission on each carrier of the frequency band C and the frequency band D during the second UL switching gap is ignored, The second UL switching gap is the maximum value or the minimum value of G3 and G4. The G3 is the maximum value of the switching period AC and the switching period BC, and The G4 is the maximum value between the switching period AD and the switching period BD.

5. The method according to claim 1, further comprising the steps of: indicating capabilities for the switching period AC, the switching period AD of the frequency band pair including the frequency band A and the frequency band D, the switching period BC of the frequency band pair including the frequency band B and the frequency band C, and the switching period BD of the frequency band pair including the frequency band B and the frequency band D; as well as performing 1-port transmission on each carrier of the frequency band A and the frequency band B, and then performing 1-port transmission on each carrier of the frequency band C and the frequency band D, Wherein, based on the second UL switching gap being located in the switching destination frequency band including the frequency band C and the frequency band D, the 1-port transmission on each carrier of the frequency band C and the frequency band D during the second UL switching gap is ignored, As the second UL switching gap, G3 is used for the frequency band C, and G4 is used for the frequency band B, The G3 is the maximum value of the switching period AC and the switching period BC, and The G4 is the maximum value between the switching period AD and the switching period BD.

6. The method according to claim 1, further comprising the steps of: indicating a capability for the switching period AC, a switching period AB of a frequency band pair including the frequency band A and the frequency band B, and a switching period BC of a frequency band pair including the frequency band B and the frequency band C; as well as performing 1-port transmission on each carrier of the frequency band A and the frequency band B, and then performing 1-port transmission on each carrier of the frequency band B and the frequency band C, Wherein, based on the second UL switching gap being located in the switching source frequency band including the frequency band A and the frequency band B, the 1-port transmission on each carrier of the frequency band A and the frequency band B during the second UL switching gap is ignored, The second UL switching gap is the maximum value or the minimum value between G1 and G2. The G1 is the maximum value of the switching period AB and the switching period AC, and The G2 is the value of the switching period BC.

7. The method according to claim 1, further comprising the steps of: indicating a capability for the switching period AC, a switching period AB of a frequency band pair including the frequency band A and the frequency band B, and a switching period BC of a frequency band pair including the frequency band B and the frequency band C; as well as performing 1-port transmission on each carrier of the frequency band A and the frequency band B, and then performing 1-port transmission on each carrier of the frequency band B and the frequency band C, Wherein, based on the second UL switching gap being located in the switching source frequency band including the frequency band A and the frequency band B, the 1-port transmission on each carrier of the frequency band A and the frequency band B during the second UL switching gap is ignored, As the second UL switching gap, G1 is used for the frequency band A, and G2 is used for the frequency band B, The G1 is the maximum value of the switching period AB and the switching period AC, and The G2 is the value of the switching period BC.

8. The method according to claim 1, further comprising the steps of: indicating a capability for the switching period AC, a switching period AB of a frequency band pair including the frequency band A and the frequency band B, and a switching period BC of a frequency band pair including the frequency band B and the frequency band C; as well as performing 1-port transmission on each carrier of the frequency band A and the frequency band B, and then performing 1-port transmission on each carrier of the frequency band B and the frequency band C, Wherein, based on the second UL switching gap being located in the switching destination frequency band including the frequency band A and the frequency band B, the 1-port transmission on each carrier of the frequency band B and the frequency band C during the second UL switching gap is ignored, The second UL switching gap is the maximum value or the minimum value of G3 and G4. The G3 is the maximum value of the switching period AB and the switching period AC, and The G4 is the value of the switching period BC.

9. The method according to claim 1, further comprising the steps of: indicating a capability for the switching period AC, a switching period AB of a frequency band pair including the frequency band A and the frequency band B, and a switching period BC of a frequency band pair including the frequency band B and the frequency band C; as well as performing 1-port transmission on each carrier of the frequency band A and the frequency band B, and then performing 1-port transmission on each carrier of the frequency band B and the frequency band C, Wherein, based on the second UL switching gap being located in the switching destination frequency band including the frequency band B and the frequency band C, the 1-port transmission on each carrier of the frequency band B and the frequency band C during the second UL switching gap is ignored, As the second UL switching gap, G3 is used for the frequency band C, and G4 is used for the frequency band B, The G3 is the maximum value of the switching period AC and the switching period BC, and The G4 is the value of the switching period AB.

10. The method according to claim 1, further comprising the steps of: performing 2-port transmission on the carrier of the frequency band C, and then performing 1-port transmission on each of the carriers of the frequency band A and the frequency band B, wherein, during the second UL switching gap, the 1-port transmission on each carrier of the frequency band A and the frequency band B is ignored, and The second UL switching gap is a switching period associated with a previous transmission in the time domain during the 1-port transmission on each carrier of the frequency band A and the frequency band B among the switching period AC and the switching period BC of the frequency band pair including the frequency band B and the frequency band C.

11. The method according to claim 1, further comprising the steps of: performing 2-port transmission on the carrier of the frequency band C, and then performing 1-port transmission on each of the carriers of the frequency band A and the frequency band B, wherein, during the second UL switching gap, the 1-port transmission on each carrier of the frequency band A and the frequency band B is ignored, and The second UL switching gap is configured for a period having a length equal to a sum of a length of the switching period AC and a length of the switching period BC of a frequency band pair including the frequency band B and the frequency band C.

12. The method according to claim 7, wherein: The second UL switching gap is configured from a starting point of a previous transmission in a time domain during the 1-port transmission on each carrier of the frequency band A and the frequency band B.

13. A user equipment UE for sending and receiving signals in a wireless communication system, the UE comprising: at least one transceiver; at least one processor; as well as at least one memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform specific operations, The specific operations include: indicating a capability for a switching period AB for a frequency band pair including frequency band A and frequency band B and a switching period AC for a frequency band pair including said frequency band A and frequency band C; and performing 2-port transmission on a carrier of the frequency band A, and then performing 1-port transmission on each of the carriers of the frequency band B and the frequency band C, During an uplink (UL) switching gap, the 2-port transmission on the carrier of the frequency band A or the 1-port transmission on each of the carriers of the frequency band B and the frequency band C is ignored, and The UL switching gap is a maximum value between the switching period AB and the switching period AC.

14. A device for a user equipment UE, the device comprising: at least one processor; as well as at least one computer memory operatively connected to the at least one processor and configured to, when executed, cause the at least one processor to perform operations comprising: indicating a capability for a switching period AB for a frequency band pair including frequency band A and frequency band B and a switching period AC for a frequency band pair including said frequency band A and frequency band C; and performing 2-port transmission on a carrier of the frequency band A, and then performing 1-port transmission on each of the carriers of the frequency band B and the frequency band C, wherein, during an uplink UL switching gap, the 2-port transmission on the carrier of the frequency band A and the 1-port transmission on each carrier of the frequency band B and the frequency band C are ignored, and The UL switching gap is a maximum value between the switching period AB and the switching period AC.

15. A computer-readable non-volatile storage medium, the computer-readable non-volatile storage medium comprising at least one computer program, the at least one computer program causing a user equipment (UE) comprising at least one processor to perform operations comprising: Indicating a capability for a switching period AB for a frequency band pair including frequency band A and frequency band B and a switching period AC for a frequency band pair including said frequency band A and frequency band C; as well as performing 2-port transmission on a carrier of the frequency band A, and then performing 1-port transmission on each of the carriers of the frequency band B and the frequency band C, wherein, during an uplink UL switching gap, the 2-port transmission on the carrier of the frequency band A and the 1-port transmission on each carrier of the frequency band B and the frequency band C are ignored, and The UL switching gap is a maximum value between the switching period AB and the switching period AC.

16. A method for sending and receiving signals by a base station BS in a wireless communication system, the method comprising the following steps: receiving, from a user equipment UE, an indication of a capability for a switching period AB for a frequency band pair comprising frequency band A and frequency band B and a switching period AC for a frequency band pair comprising said frequency band A and frequency band C; as well as receiving a 2-port transmission on a carrier of the frequency band A from the UE, and then receiving a 1-port transmission on each of the carriers of the frequency band B and the frequency band C from the UE, wherein, during an uplink UL switching gap, the 2-port transmission on the carrier of the frequency band A and the 1-port transmission on each carrier of the frequency band B and the frequency band C are ignored, and The UL switching gap is a maximum value between the switching period AB and the switching period AC.

17. A base station BS for sending and receiving signals in a wireless communication system, the BS comprising: at least one transceiver; at least one processor; as well as at least one memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform specific operations, The specific operations include: receiving, from a user equipment UE, an indication of a capability for a switching period AB for a frequency band pair including frequency band A and frequency band B and a switching period AC for a frequency band pair including said frequency band A and frequency band C; and receiving a 2-port transmission on a carrier of the frequency band A from the UE, and then receiving a 1-port transmission on each of the carriers of the frequency band B and the frequency band C from the UE, During an uplink (UL) switching gap, the 2-port transmission on the carrier of the frequency band A and the 1-port transmission on each carrier of the frequency band B and the frequency band C are ignored, and The UL switching gap is a maximum value between the switching period AB and the switching period AC.

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