Method and device for transmitting and receiving signals in wireless communication system

Abstract

A method and a device for transmitting and receiving signals in a wireless communication system, disclosed in the present specification, trigger uplink switching for uplink transmission between at least three uplink bands. Specifically, the length and location of a switching gap when one of the at least three uplink bands is disabled are determined.

Description

Method and device for transmitting and receiving signals in a wireless communication system

[0001] The present invention relates to a method and apparatus used in a wireless communication system.

[0002] Wireless communication systems are widely deployed to provide various types of communication services, such as voice and data. Typically, wireless communication systems are multiple access systems that support communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power). Examples of multiple access systems include Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA).

[0003] The technical problem to be achieved by the present invention is to provide a method for efficiently transmitting and receiving wireless communication signals and a device therefor.

[0004] The technical problems of the present invention are not limited to the technical problems described above, and other technical problems can be inferred from the embodiments of the present invention.

[0005] The present invention provides a method and device for transmitting and receiving signals in a wireless communication system.

[0006] In one aspect of the present invention, a method for transmitting and receiving a signal by a terminal (UE) in a wireless communication system is provided, comprising: setting at least three uplink bands; and performing uplink transmissions on all or part of the at least three uplink bands; wherein uplink switching is triggered based on the uplink transmissions, uplink transmission is omitted during an uplink switching gap associated with the uplink switching, and a length of a switching gap of the uplink switching is determined based on deactivation of a specific band(s) among the at least three uplink bands, as a length of a switching interval of a longest length among switching intervals for each band pair reported as a terminal capability, excluding switching intervals associated with the specific band(s).

[0007] As another aspect of the present invention, a device, a processor, and a storage medium for performing the signal transmission and reception method are provided.

[0008] The above devices may include at least a terminal, a network, and an autonomous vehicle capable of communicating with other autonomous vehicles other than the above devices.

[0009] The above-described aspects of the present invention are only some of the preferred embodiments of the present invention, and various embodiments reflecting the technical features of the present invention can be derived and understood by a person having ordinary skill in the art based on the detailed description of the present invention described below.

[0010] According to one embodiment of the present invention, when a signal is transmitted and received between communication devices, there is an advantage in that more efficient signal transmission and reception can be performed through operations differentiated from those of the prior art.

[0011] The technical effects of the present invention are not limited to the technical effects described above, and other technical effects can be inferred from the embodiments of the present invention.

[0012] Figure 1 illustrates the structure of a radio frame.

[0013] Figure 2 illustrates a resource grid of slots.

[0014] Figure 3 shows an example of physical channels being mapped within a slot.

[0015] Figures 4 and 5 are drawings for explaining a signal transmission and reception method according to an embodiment of the present invention.

[0016] Figures 6 to 9 illustrate devices according to embodiments of the present invention.

[0017] The following technologies can be used in various wireless access systems, such as CDMA, FDMA, TDMA, OFDMA, and SC-FDMA. CDMA can be implemented using wireless technologies such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented using wireless technologies such as GSM (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented using wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA). UTRA is a part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A (Advanced) / LTE-A pro is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0018] For clarity, the description is based on a 3GPP communication system (e.g., LTE, NR), but the technical idea of ​​the present invention is not limited thereto. LTE refers to technology after 3GPP TS 36.xxx Release 8. Specifically, LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 is referred to as LTE-A pro. 3GPP NR refers to technology after TS 38.xxx Release 15. LTE / NR may be referred to as a 3GPP system. "xxx" refers to a standard document detail number. LTE / NR may be collectively referred to as a 3GPP system. For background technology, terms, abbreviations, etc. used in the description of the present invention, reference may be made to matters described in standard documents published prior to the present invention. For example, reference may be made to the following documents.

[0019] 3GPP NR

[0020] - 38.211: Physical channels and modulation

[0021] - 38.212: Multiplexing and channel coding

[0022] - 38.213: Physical layer procedures for control

[0023] - 38.214: Physical layer procedures for data

[0024] - 38.300: NR and NG-RAN Overall Description

[0025] - 38.331: Radio Resource Control (RRC) protocol specification

[0026] Figure 1 illustrates the structure of a radio frame used in NR.

[0027] In NR, uplink (UL) and downlink (DL) transmissions are structured as frames. A radio frame is 10ms long and is defined as two 5ms half-frames (HF). Each half-frame is defined as five 1ms subframes (SF). A subframe is divided into one or more slots, and the number of slots in a subframe depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM(A) symbols, depending on the cyclic prefix (CP). When normal CP is used, each slot contains 14 symbols. When extended CP is used, each slot contains 12 symbols. Here, the symbols can include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or DFT-s-OFDM symbols).

[0028] Table 1 illustrates that when CP is normally used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0029] [Table 1]

[0030]

[0031] Table 2 illustrates that when extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0032] [Table 2]

[0033]

[0034] In an NR system, OFDM(A) numerology (e.g., SCS, CP length, etc.) may be set differently between multiple cells that are merged into a single user equipment (UE). Accordingly, the (absolute time) interval of a time resource (e.g., SF, slot, or TTI) (conveniently referred to as a TU (Time Unit)) consisting of the same number of symbols may be set differently between the merged cells.

[0035] NR supports multiple Orthogonal Frequency Division Multiplexing (OFDM) numerologies (e.g., subcarrier spacing, SCS) to support various 5G services. For example, a 15 kHz SCS supports wide areas in traditional cellular bands, while a 30 kHz / 60 kHz SCS can support dense urban areas, lower latency, and wider carrier bandwidth.

[0036] The NR frequency band is defined by two types of frequency ranges (FR) (FR1 / FR2). FR1 / FR2 can be configured as shown in Table 3 below. FR2 can also refer to millimeter wave (mmW).

[0037] [Table 3]

[0038]

[0039] Figure 2 illustrates the slot structure of an NR frame.

[0040] A slot contains multiple symbols in the time domain. For example, for a normal CP, one slot contains 14 symbols, and for an extended CP, one slot contains 12 symbols. A carrier contains multiple subcarriers in the frequency domain. An RB (Resource Block) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. Multiple RB interlaces (simply, interlaces) can be defined in the frequency domain. An interlace m ∈ {0, 1, ..., M-1} can be composed of (common) RBs {m, M+m, 2M+m, 3M+m, ...}. M represents the number of interlaces. A BWP (Bandwidth Part) is defined as multiple consecutive RBs (e.g., physical RBs, PRBs) in the frequency domain, and can correspond to one OFDM numerology (e.g., SCS(u), CP length, etc.). A carrier can contain up to N (e.g., 5) BWPs. Data communication is performed through activated BWPs, and only one BWP can be activated per terminal within a single cell / carrier. Each element in the resource grid is referred to as a Resource Element (RE), to which a single modulation symbol can be mapped.

[0041] In a wireless communication system, a terminal receives information from a base station via the downlink (DL), and the terminal transmits information to the base station via the uplink (UL). The information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels / signals exist depending on the type / purpose of the information they transmit and receive. A physical channel corresponds to a set of resource elements (REs) that carry information derived from a higher layer. A physical signal corresponds to a set of resource elements (REs) used by the physical layer (PHY), but does not carry information derived from a higher layer. The higher layers include the Medium Access Control (MAC) layer, the Radio Link Control (RLC) layer, the Packet Data Convergence Protocol (PDCP) layer, and the Radio Resource Control (RRC) layer.

[0042] 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 RS (DM-RS), Phase-tracking RS (PT-RS), and Channel-state information RS (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 RS (SRS).

[0043] Figure 3 shows an example of physical channels being mapped within a slot.

[0044] A DL control channel, DL or UL data, and UL control channel can all be included in a single slot. For example, the first N symbols in a slot can be used to transmit a DL control channel (hereinafter, DL control region), and the last M symbols in the slot can be used to transmit a UL control channel (hereinafter, UL control region). N and M are each integers greater than or equal to 0. A resource region (hereinafter, data region) between the DL control region and the UL control region can be used for DL ​​data transmission or UL data transmission. A time gap for DL-to-UL or UL-to-DL switching can exist between the control region and the data region. A PDCCH can be transmitted in the DL control region, and a PDSCH can be transmitted in the DL data region. Some symbols at the time of switching from DL to UL within a slot can be used as a time gap.

[0045] In the present invention, the base station may be, for example, a gNodeB.

[0046] Uplink (UL) physical channel / signal

[0047] (1) PUSCH

[0048] The PUSCH carries uplink data (e.g., UL-SCH TB) and / or uplink control information (UCI), and is transmitted based on a CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) waveform or a DFT-s-OFDM (Discrete Fourier Transform-spread-OFDM) waveform. When the PUSCH is transmitted based on a DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. For example, when transform precoding is disabled (e.g., transform precoding is disabled), the UE transmits the PUSCH based on the CP-OFDM waveform, and when transform precoding is enabled (e.g., transform precoding is enabled), the UE can transmit the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. PUSCH can be dynamically scheduled by PDCCH (dynamic scheduling) or semi-statically scheduled based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)) (Configured Scheduling, CS). Therefore, in dynamic scheduling, PUSCH transmission is accompanied by PDCCH, but in CS, PUSCH transmission is not accompanied by PDCCH. CS includes Type-1 Configured Grant (CG) PUSCH transmission and Type-2 CG PUSCH transmission. In Type-1 CG, all parameters for PUSCH transmission are signaled by higher layers. In Type-2 CG, some of the parameters for PUSCH transmission are signaled by higher layers, and the rest are signaled by PDCCH. Basically, in CS, PUSCH transmission is not accompanied by PDCCH.

[0049] (2) PUCCH

[0050] PUCCH carries Uplink Control Information (UCI). UCI includes:

[0051] - SR (Scheduling Request): Information used to request UL-SCH resources.

[0052] - HARQ-ACK (Hybrid Automatic Repeat and reQuest Acknowledgement): This is a reception response signal for DL ​​signals (e.g., PDSCH, SPS release PDCCH). The HARQ-ACK response may include positive ACK (simply ACK), negative ACK (NACK), Discontinuous Transmission (DTX), or NACK / DTX. HARQ-ACK can be used interchangeably with A / N, ACK / NACK, HARQ-ACK / NACK, etc. HARQ-ACK can be generated on a TB basis / CBG basis.

[0053] - CSI (Channel Status Information): Feedback information for the DL channel. CSI includes CQI (Channel Quality Information), RI (Rank Indicator), PMI (Precoding Matrix Indicator), and PTI (Precoding Type Indicator).

[0054] Table 4 illustrates PUCCH formats. PUCCH formats can be categorized based on UCI payload size, transmission length (e.g., the number of symbols constituting a PUCCH resource), and transmission structure. PUCCH formats can be categorized into Short PUCCH (formats 0 and 2) and Long PUCCH (formats 1, 3, and 4) based on transmission length.

[0055] [Table 4]

[0056]

[0057] (0) PUCCH Format 0 (PF0)

[0058] - Supported UCI payload sizes: up to K bits (e.g., K = 2)

[0059] - Number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., X = 2)

[0060] - Transmission structure: Consists of only UCI signals without DM-RS, and transmits the UCI status by selecting and transmitting one of multiple sequences.

[0061] (1) PUCCH Format 1 (PF1)

[0062] - Supported UCI payload sizes: up to K bits (e.g., K = 2)

[0063] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y = 4, Z = 14)

[0064] Transmission Structure: DM-RS and UCI are configured in TDM format on different OFDM symbols, with UCI multiplying a specific sequence with modulation (e.g., QPSK) symbols. Cyclic Shift (CS) / Orthogonal Cover Code (OCC) is applied to both UCI and DM-RS to support CDM between multiple PUCCH resources (following PUCCH Format 1) (within the same RB).

[0065] (2) PUCCH Format 2 (PF2)

[0066] - Supported UCI payload size: more than K bits (e.g., K = 2)

[0067] - Number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., X = 2)

[0068] - Transmission structure: DMRS and UCI are configured / mapped in FDM format within the same symbol, and are transmitted by applying only IFFT without DFT to the encoded UCI bits.

[0069] (3) PUCCH Format 3 (PF3)

[0070] - Supported UCI payload size: more than K bits (e.g., K = 2)

[0071] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y = 4, Z = 14)

[0072] Transmission structure: DMRS and UCI are configured / mapped to different symbols in TDM format, and transmitted by applying DFT to the corrupted UCI bits. OCC is applied to UCI at the DFT front end, and CS (or IFDM mapping) is applied to DMRS to support multiplexing to multiple terminals.

[0073] (4) PUCCH Format 4 (PF4)

[0074] - Supported UCI payload size: more than K bits (e.g., K = 2)

[0075] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y = 4, Z = 14)

[0076] - Transmission structure: DMRS and UCI are configured / mapped to different symbols in TDM format, and a structure that transmits without multiplexing between terminals by applying DFT to the encoded UCI bits.

[0077] Uplink switching with 3 or 4 uplink bands

[0078] The contents discussed above can be applied in combination with the methods proposed in the present invention described below, or can be supplemented to clarify the technical features of the methods proposed in the present invention.

[0079] In addition, the methods described below can be equally applied to the NR system (licensed band) or shared spectrum described above, and the technical ideas proposed in this specification can be modified or replaced to fit the terms, expressions, structures, etc. defined in each system so that they can be implemented in the corresponding systems.

[0080] Typically, a UE has a limited number of antennas that can be installed on it due to its size. A UE with N transmit chains via N antennas can support up to N 1-port UL transmissions simultaneously, or up to N-port UL transmissions. A method is required to support a UE with limited transmit chains to perform UL transmission efficiently. Below, implementations of this specification with respect to UL transmission (Tx) switching are described. Since most UEs developed to date support up to two Tx chains, below, implementations of this specification are described on the assumption that the UE supports UL transmission via up to two Tx chains, i.e., up to two ports. However, implementations of this specification are not limited to 1-port or 2-port UL transmission, and can also be applied to N-port UL transmission, where N can be greater than 2.

[0081] Figure 4 is a diagram illustrating the concept of uplink transmission switching.

[0082] In order to increase the throughput and efficiency of UL transmission, NR Rel-16 stipulates UL Tx switching (UTS), which switches Tx chain(s) connected to UL carrier(s) under specific conditions, for the purpose of enabling UE to effectively perform 1-port UL transmission or 2-port UL transmission using up to 2 Tx chains. Fig. 4(a) illustrates 1Tx-2Tx switching between 2 carriers / bands, and Fig. 4(b) illustrates 2Tx-2Tx switching between 2 carriers / bands.

[0083] For example, if UL transmission (hereinafter, previous transmission) is performed on carrier #1 with 1 Tx chain, and then UL transmission (hereinafter, current transmission) is performed on another carrier #2 with 2 Tx chains, the UE may switch the Tx chain connected to carrier #1 to carrier #2 to enable 2-port UL transmission on carrier #2. This UTS configuration and switching method can be applied to band combinations corresponding to EN-DC (Evolved-Universal Terrestrial Radio Access New-Radio - Dual Connectivity) without supplementary UL (SUL), standalone SUL, and inter-band CA. In NR Rel-17, additional conditions are introduced to extend the 1Tx-2Tx switching (i.e., switching between 1 Tx chain and 2 Tx chains) of the existing NR Rel-16 to 2Tx-2Tx switching (i.e., switching between 2 Tx chains and 2 Tx chains), and at the same time, the UTS between two carriers introduced in NR Rel-16 is extended to allow UTS between two different bands (e.g., 1 carrier in one band and 2 contiguous carriers in another band).

[0084] If certain conditions are met and the UE is configured to uplinkTxSwitching via RRC signaling, the UE may omit uplink transmission during uplink switching gap NTx1-Tx2. For example, if certain conditions are met and the UE is configured to uplinkTxSwitching via RRC signaling, the UE may omit uplink transmission during uplink switching gap N Tx1-Tx2All UL transmissions, including UL transmissions scheduled via DCI and UL transmissions established by higher layer signaling (e.g., established grant-based PUSCH), are skipped during the switching gap NTx1-Tx2. The switching gap NTx1-Tx2 may be indicated by uplinkTxSwitchingPeriod2T2T provided from the UE to the BS via UE capability report when uplinkTxSwitching-2T-Mode is established via RRC signaling, or by uplinkTxSwitchingPeriod provided from the UE to the BS via UE capability report otherwise. Here, the RRC configuration uplinkTxSwitching may be provided to the UE as included in the configuration regarding the serving cell, and may include uplinkTxSwitchingPeriodLocation indicating whether the location of the UL Tx switching period is set on this UL carrier in case of inter-band UL CA, SUL or (NG)EN-DC, and uplinkTxSwitchingCarrier indicating that the set carrier is carrier 1 or carrier 2 for dynamic UL Tx switching. The RRC parameter uplinkTxSwitching-2T-Mode indicates that the 2Tx-2Tx switching mode is set for inter-band UL CA or SUL, in which case the switching gap duration for the triggered UL switching may be equal to the switching time capability value reported for the switching mode. If the RRC parameter uplinkTxSwitching-2T-Mode is not provided and uplinkTxSwitching is set, it can be interpreted that 1Tx-2Tx UTS is set, in which case there can be one uplink (or one uplink band in case of intra-band) set to uplinkTxSwitching.

[0085] If the UE has indicated the capability for uplink switching for a band combination, and for that band combination, it is configured as MCG using E-UTRA radio access and SCG using NR radio access, or configured as uplink CA, or configured as a serving cell with two UL carriers with the higher layer (e.g., RRC) parameter supplementaryUplink, then the switching gap may exist under certain conditions.

[0086] Uplink switching, T0- T offset When triggered for an uplink transmission starting from T0, the UE is not expected to cancel the uplink switching, or T0-T offset It is not expected that any other uplink transmission scheduled later will trigger any other new uplink switching occurring before T0, where T offset may be a UE processing procedure time defined for an uplink transmission that triggers 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). The UE may be u UL = max(u UL,1 , u UL,2 ) is not expected to perform more than one uplink switching in a slot, where u UL,1 corresponds to the subcarrier spacing of the active UL BWP of the uplink carrier before the above switching gap, u UL,2 corresponds to the subcarrier spacing of the active UL BWP of another uplink carrier after the above switching gap.

[0087] NR supports a wide spectrum across various frequency ranges. The 5G evolution market is expected to see increased spectrum availability due to the realignment of bands originally used in previous cellular networks. In particular, available spectrum blocks in the low-frequency FR1 bands tend to be more fragmented and distributed across narrower bandwidths. In the FR2 bands and some FR1 bands, available spectrum may be wider, necessitating multi-carrier operation within the band. To meet diverse spectrum requirements, it is crucial to utilize these distributed spectrum bands or wider bandwidth spectrum in a more spectrum- / power-efficient and flexible manner to provide higher throughput and adequate coverage in the network. The current specification for multi-carrier UL operation imposes several limitations. For example, a 2TX UE can only be configured with up to two UL bands, which can be changed only by an RRC reconfiguration, and UL Tx switching can only be performed between the two UL bands for a 2TX UE. Instead of RRC-based cell(s) reconfiguration, dynamically selecting carriers with UL Tx switching, for example based on data traffic, TDD DL / UL configuration, bandwidth and channel conditions of each band, could potentially lead to higher UL data rates, spectrum utilization and UE capacity.

[0088] For higher UL data rates, spectrum utilization, and UE capacity, UTS across more than two bands is being considered. Below, the UTS trigger condition(s), UTS-related configuration method(s), and / or UTS operation method(s) required to support UTS across multiple bands (e.g., three or more bands) according to some implementations of this specification are described.

[0089] Hereinafter, a cell can be interpreted depending on the context. For example, a cell can mean a serving cell. Also, a cell can be composed of one DL component carrier (CC) and 0 to 2 UL CCs, but the implementations of this specification described below are not limited to this. Hereinafter, the terms cell and CC can be used interchangeably unless otherwise specified. Also, in some implementations of this specification, cell / CC can be applied by replacing it with an (active) BWP within a serving cell. Also, unless otherwise specified, in the implementations of this specification described below, cell / CC can be used as a concept encompassing PCell, SCell, PsCell, etc. that can be configured / expressed in a carrier aggregation (CA) / dual connectivity (DC) scenario.

[0090] Hereinafter, the term "band" refers to a frequency band, and the term "band" can be used interchangeably with the terms "carrier" and / or "cell" within the band. In this case, each band can be composed of one carrier or multiple (e.g., two) contiguous (or non-contiguous) carriers. In addition, the proposed methods 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).

[0091] For convenience of explanation, the following notation is used in the implementations of this specification described below.

[0092] - When a UTS occurs, it can be expressed as a UTS trigger.

[0093] - Band (or carrier) associated with UTS: This can refer to the band / carrier before and after the UTS occurs.

[0094] - The Tx chain transition time caused by UTS is referred to as a UTS gap (or UTS period). During the UTS gap, no UL transmission occurs on the band / carrier associated with the UTS. The UTS gap (switching gap) and UTS period (switching period) can be specifically distinguished as follows.

[0095] ■ Switching period: The switching time reported by the terminal. Basically, it is reported as one value among {35us, 140us, 210us} for each band pair consisting of two bands. For specific switching cases, one value may be reported for each band combination consisting of three or more bands. In this specification, it can also be expressed as UTS interval / period or switching period.

[0096] ■ Switching gap: A time duration during which UL transmission in all (or some) bands associated with a single UL Tx switching event is restricted. The switching gap may be determined by the switching interval (reported by the terminal) for the Tx switching event, or by using the switching intervals of each band pair associated with the Tx switching event.

[0097] 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 band combination {A+B, C} is reported by the terminal, the switching gap is determined as the reported value. If not reported, the switching gap can be determined as a value derived using the switching period AB (period_AB) for the band pair including bands A and B and the switching period AC (period_AC) for the band pair including bands A and C. In this specification, it can also be expressed as UTS gap / interval or switching interval.

[0098] - A 1 Tx chain can be expressed as 1T, and a 2Tx chain can be expressed as 2T.

[0099] - 1-port UL transmission can be expressed as 1p, and 2-port UL transmission can be expressed as 2p.

[0100] - If 1 Tx chain or 2 Tx chains are connected to a specific band A (and / or carrier(s) belonging to band A), this state can be expressed as A(1T) and A(2T), respectively.

[0101] - If 1 Tx chain is connected to each of two specific bands A (and / or carrier(s) belonging to band A) and band B (and / or carrier(s) belonging to band A), this state can be expressed as A(1T)+B(1T).

[0102] - UL transmission can mean any UL channel or UL signal supported by NR, etc.

[0103] - "Previous transmission" may refer to the most recent UL transmission performed by the UE prior to UTS triggering, and "current transmission" may refer to a UL transmission performed by the UE immediately (or simultaneously) with UTS triggering. In addition, the term "transmission" hereinafter may refer to "UL transmission."

[0104] - The expression that a UL transmission has occurred may mean a UL transmission scheduled via DCI for a UL grant and / or a UL transmission established via higher layer signaling (e.g., RRC signaling) (e.g., an established grant UL transmission).

[0105] - If a 1-port UL transmission occurs in a specific band A (and / or carrier(s) belonging to band A), it can be expressed as A(1p), and if a 2-port UL transmission occurs, it can be expressed as A(2p).

[0106] - If 1-port UL transmission occurs on two specific bands, e.g., band A and band B, (and / or carrier(s) belonging to those bands), it can be expressed as A(1p)+B(1p).

[0107] Some implementations of this specification described below focus on the occurrence of UTS between two bands when four bands / carriers are configured (or activated). However, the same method(s) as the implementations of this specification described below can also be applied to UTS occurring when a smaller number of bands (e.g., three) are configured / activated. Furthermore, the same method(s) as the implementations of this specification described below can also be applied to UTS occurring when a larger number of bands (e.g., five) are configured / activated.

[0108] Some implementations of this specification described below are described without distinguishing between 1Tx-2Tx switching or 2Tx-2Tx switching. However, some implementations may be specifically applicable to 1Tx-2Tx switching and / or 2Tx-2Tx switching.

[0109] In some implementations of this specification described below, "simultaneous transmission" on multiple bands may mean that the start times (e.g., start symbols) of UL transmissions on each of the multiple bands coincide and / or some (or all) of the UL transmission resources / periods on each of the multiple bands overlap in time.

[0110] In some implementations of this specification described below, "bands involved in UL Tx switching" may mean switch-from band(s) and / or switch-to band(s) in a particular UL Tx switching operation. Here, the switch-from band(s) means the band(s) where the Tx chain is located (or connected) before the UL Tx switching when the Tx chain is switched from a particular band(s) to another particular band(s), and the switch-to band(s) means the band(s) where the Tx chain is located (or connected) after the switching.

[0111] In the proposal described below, a "deactivated band" may mean a case where all cells (or SCells or carriers) belonging to a specific UL band are deactivated, or a case where all cells (or SCells or carriers) belonging to a specific UL band are in a dormant state, or a case where all cells (or SCells or carriers) belonging to a specific UL band are either deactivated cells or dormant cells. In addition, an "activated band" may mean a band other than a deactivated band. In this case, the activation / deactivation or dormant / non-dormant state for the cell (or SCell or carrier) may be performed through a MAC-CE (Medium Access Control-Control Element) command or may be set / indicated through DCI.

[0112] In the proposal described below, the term "switching period length" refers to the period during which UL transmission can be omitted in some (or all) of the bands included in a specific UL Tx switching. This refers to the uplink switching gap in section 6.1.6 of the 3GPP TS 38.214 document.

[0113] In the proposal described below, the “switching period location” indicates, for a specific UL Tx switching, the band in which the uplink switching gap is located among the bands included in that Tx switching.

[0114] In the proposal described below, the method for determining the switching section location can be based on the priority (set through RRC, etc.) for each UL band (i.e., priority-based location determination). That is, it means a method of setting the priority of each band in advance (through RRC) for the UL bands where UL Tx switching is set, and then determining the switching section location so that the switching section is not located in the highest priority band. For example, when Tx switching is triggered, if the band with the highest priority among the "bands included in UL Tx switching" is the switch-from band (or switch-to band), the switching section location can be determined as the switch-to band (or switch-from band). More specifically, it can operate as follows (for example).

[0115] For a scalable link switch, the terminal determines the band of the switching section location according to the configured band priority as defined in 3GPP TS 38.101-1, where the band-specific priority is provided by the upper layer parameter [BandPriorityList]. The switch is located in one of the following:

[0116] ● For UEs with the uplink Tx switching option (uplinkTxSwitchingOption) set to 'switchedUL',

[0117] ■ If the highest priority band among the bands where transmission occurs before and after switching is the switch-to band, the switch-from band(s), or

[0118] ■ If the highest priority band among the bands where transmission occurs before and after switching is the switch-from band, the switch-to band(s)

[0119] ● For UEs with the uplink Tx switching option set to 'dualUL' in either the switch-from or switch-to bands,

[0120] ■ Switch-from band(s) if the highest priority band is the switch-to band, or

[0121] ■ Switch-to band(s) when the highest priority band is the switch-from band

[0122] At this time, if a specific band belongs to both the switch-from band and the switch-to band, the band may not be considered when determining the location.

[0123] The RRC parameter uplinkTxSwitchingOption provided to the UE by the BS can indicate which option is configured for dynamic UL Tx switching for inter-band UL CA or (NG)EN-DC. This RRC parameter is set to swtichedUL if the network configures Option1, and to dualUL if the network configures Option2. If the UE receives the RRC value as "switchedUL", the UE does not expect / perform one Tx chain to be connected to each of the two bands, or does not expect / perform simultaneous transmission (instruction / configuration) on the two bands even if each of them has one Tx chain connected. This is hereinafter referred to as Option1 operation being configured. For example, a UE configured as switchedUL does not expect / perform simultaneous transmission of A(1T) and B(1T) to be indicated / configured, and the BS will not instruct / configure simultaneous transmission of A(1T) and B(1T) to the UE. If the UE sets the RRC value to "dualUL", the UE can expect to schedule / configure (or perform) simultaneous transmissions on the two bands through 1 Tx chain connected to each of the two bands, and this is hereinafter expressed as Option2 operation being configured.

[0124] In this specification, the Tx chain and the parts represented by Tx can be replaced with a transmission antenna connector, a transmitter, or a transmission chain.

[0125] In the proposal described below, the case where one of the switch-to bands is a disabled band (not a band for which UL transmission is scheduled via a UL grant or configured for UL transmission by a higher layer) may include the case where it is an associated band. For example, when a 1P UL transmission occurs on band C in the switch-from band A(1T)+B(1T) state (or A(2T) state), if band D is a band associated with band C (configured with RRC, etc.), the switch-to band of the corresponding Tx switching may be C(1T)+D(1T). The proposed method described below may be specifically applied to such a case.

[0126] The following expressions can be used in the following explanation (assuming 4 bands A, B, C, D):

[0127] - gap(A,B) = reported switching interval for band pair {A,B}

[0128] - gap(A,C) = reported switching interval for band pair {A,C}

[0129] - gap(A,D) = reported switching interval for band pair {A,D}

[0130] - gap(B,C) = reported switching interval for band pair {B,C}

[0131] - gap(B,D) = reported switching interval for band pair {B,D}

[0132] - gap(C,D) = reported switching interval for band pair {C,D}

[0133] - P(A) = priority set to band A

[0134] - P(B) = priority set to band B

[0135] - P(C) = priority set to band C

[0136] - P(D) = priority set to band D

[0137] The proposals described below can be applied based on the UE capability reported (for optional / advanced UE) for each proposal or RRC configuration based on this.

[0138] [1] Method for determining the switching interval length

[0139] [1-1] If one or more of the band(s) included in a specific UL Tx switching is a disabled band(s), the switching interval length for the Tx switching may be determined by considering only the remaining bands (or band pairs) excluding the disabled band(s).

[0140] - Example 1: When the band(s) included in Tx switching are bands {A, B, C, D}, if band A is a disabled band, the switching interval length can be determined using only {B, C, D}. Alternatively, if band A and band B are disabled bands, the switching interval length can be determined using only {C, D}. For example,

[0141] ■ About switching A(1T)+B(1T)->C(1T)+D(1T),

[0142] ◆ If A is a disabled band, the switching interval length is max{gap(B,C), gap(B,D)}

[0143] ◆ If C is a disabled band, the switching interval length is max{gap(A,D), gap(B,D)}

[0144] ◆ If A and C are inactive bands, the switching interval length is gap(B,D),

[0145] ◆ For reference, if there are no disabled bands, the switching interval length can be max{gap(A,C), gap(A,D), gap(B,C), gap(B,D)}.

[0146] - Example 2: When the band(s) included in Tx switching are bands {A, B, C}, if band A is a disabled band, the switching interval length can be determined only for {B, C}. For example,

[0147] ■ About switching A(1T)+B(1T)->C(2T) or C(2T)->A(1T)+B(1T)

[0148] ◆ If there are no disabled bands, the switching interval length is max{gap(A,C), gap(B,C)}

[0149] ◆ If A is a disabled band, the switching interval length is gap(B,C)

[0150] ■ About switching A(1T)+B(1T)->A(1T)+C(1T)

[0151] ◆ If there is no disabled band, the switching interval length is gap(B,C) or max{gap(A,C),gap(A,B)}

[0152] ◆ If A is a disabled band, the switching interval length is gap(B,C)

[0153] ◆ If B is a disabled band, the switching interval length is gap(A,C)

[0154] ◆ If C is a disabled band, the switching interval length is gap(A,B)

[0155] [1-2] For the above [1-1], it can be assumed that the terminal does not encounter a case where all bands of the switch-from band are deactivated band(s).

[0156] [2] Method for determining the switching section location

[0157] [2-1] If one or more of the band(s) included in a specific UL Tx switching is a disabled band(s), the switching section position for the Tx switching may be determined by considering only the remaining bands (or band pairs) excluding the disabled band(s).

[0158] - Example 1: When the band(s) included in Tx switching are bands {A, B, C, D}, if band A is a disabled band, the switching interval position can be determined using only {B, C, D}. Alternatively, if band A and band B are disabled bands, the switching interval length can be determined using only {C, D}. For example,

[0159] ■ About A(1T)+B(1T)->C(1T)+D(1T) switching

[0160] ◆ If there is no disabled band, then max{P(A),P(B)}>max{P(C),P(D)}, then the switching section location is determined by bands C and D, and max{P(A),P(B)} <max{P(C),P(D)}이면 스위칭 구간 위치는 대역 A와 B로 결정됨

[0161] ◆ If A is a disabled band, then if P(B)>max{P(C),P(D)}, the switching section position is determined by bands C and D, and P(B) <max{P(C),P(D)}이면 스위칭 구간 위치는 스위칭 구간 위치는 대역 A와 B로 결정됨

[0162] ◆ If C is a disabled band, then if max{P(A),P(B)}>P(D), the switching section position is determined by bands C and D, and max{P(A),P(B)} <P(D)이면 스위칭 구간 위치는 대역 A와 B로 결정됨

[0163] ◆ If A and C are inactive bands, and P(B)>P(D), the switching section location is determined by bands C and D, and P(B) <P(D)이면 스위칭 구간 위치는 대역 A와 B로 결정됨

[0164] - Example 2: When the band(s) included in Tx switching are bands {A, B, C}, if band A is a deactivated band, the switching section position can be determined using only {B, C}. For example,

[0165] ■ About switching A(1T)+B(1T)->C(2T) or C(2T)->A(1T)+B(1T)

[0166] ◆ If there is no disabled band, then if max{P(A),P(B)}>P(C), the switching section position is determined as band C, and max{P(A),P(B)} <P(C)이면 스위칭 구간 위치는 A와 B로 결정됨

[0167] ◆ If A is a disabled band, and P(B)>P(C), the switching section location is determined as band C and P(B) <P(C)이면 스위칭 구간 위치는 대역 A와 B로 결정됨

[0168] ■ About switching A(1T)+B(1T)->A(1T)+C(1T)

[0169] ◆ If there is no disabled band, and P(B)>P(C), the switching section location is determined by bands A and C, and P(B) <P(C)이면 스위칭 구간 위치는 대역 A와 B로 결정됨

[0170] ◆ If A is a disabled band, and P(B)>P(C), the switching section location is determined by bands A and C, and P(B) <P(C)이면 스위칭 구간 위치는 대역 A와 B로 결정됨

[0171] ◆ If B is a disabled band, and P(A)>P(C), the switching section location is determined by bands A and C, and P(A) <P(C)이면 band A와 B로 결정됨

[0172] ◆ If C is a disabled band, and P(A)>P(B), the switching section location is determined by bands A and B, and P(A) <P(B)이면 스위칭 구간 위치는 대역 A와 C로 결정됨

[0173] [2-2] For the above [2-1], the terminal can assume that there is no case where all bands of the switch-from band or the switch-to band are disabled band(s). Alternatively, if all bands of the switch-from band or the switch-to band are disabled band(s), the switching section position can be determined as the switch-from band or the switch-to band consisting of the disabled bands.

[0174] - Example 1:

[0175] ■ About A(1T)+B(1T)->C(1T)+D(1T) switching

[0176] ◆ If A and B are inactive bands, the switching section location is determined by bands A and B.

[0177] ◆ If C and D are inactive bands, the switching section location is determined by bands C and D.

[0178] - Example 2:

[0179] ■ About switching A(1T)+B(1T)->C(2T) or C(2T)->A(1T)+B(1T)

[0180] ◆ If A and B are inactive bands, the switching section location is determined by bands A and B.

[0181] ◆ If C is a disabled band, the switching section location is determined by band C.

[0182] - Example 3:

[0183] ■ About switching A(1T)+B(1T)->A(1T)+C(1T)

[0184] ◆ If B is a disabled band, the switching section location is determined by bands A and B.

[0185] ◆ If C is a disabled band, the switching section location is determined by bands A and C.

[0186] - Example 4:

[0187] ■ About A(2T)->B(2T) switching

[0188] ◆ If A is a disabled band, the switching section location is determined as band A.

[0189] ◆ If B is a disabled band, the switching section location is determined by band B.

[0190] [2-3] For the above [2-1]-[2-2], the priority of the disabled band is considered as the lowest priority, and the switching interval position for the corresponding Tx switching can be determined. For example, when the priority for bands {A, B, C, D} is set to A>B>C>D, if band C is a disabled band at the time when a specific Tx switching is triggered, the priority between bands can be considered as A>B>C=D when the switching interval position is determined.

[0191] [3] How to handle disabled band(s) when determining switching interval length and / or switching interval position.

[0192] [3-1] If one or more of the bands included in a specific UL Tx switching is a disabled band(s), the disabled band(s) may be maintained without being excluded from the bands included in the Tx switching.

[0193] - For example, when the switch-from band is A(1T)+B(1T) or A(2T), and a 1-port UL transmission occurs in band C (scheduling through UL grant or UL transmission set to a higher layer), and if the associated band set to band C (through RRC, etc.) is band D, the switch-to band of the corresponding switching can be C(1T)+D(1T) even if D is changed to a disabled band.

[0194] - As another example, for A(1T)+B(1T)->C(2T) or C(2T)->A(1T)+B(1T) switching, even if one or more of A, B, and C is a disabled band, the switch-from band and switch-to band of the Tx switching may be the same.

[0195] At this time, the switching section length determination method mentioned in [1] above and / or the switching section position determination method mentioned in [2] above may be applied as one of the following.

[0196] - Method 1:

[0197] ■ The switching interval length is determined by including the disabled band.

[0198] ■ The switching interval location is determined by including the disabled band.

[0199] ◆ Or, when determining the switching section location, the priority of the disabled band is determined by applying the method of [2-3].

[0200] - Method 2:

[0201] ■ The switching interval length is determined by including the disabled band.

[0202] ■ The switching interval location is determined without including the disabled band (as suggested in [2]).

[0203] - Method 3:

[0204] ■ The switching interval length is determined without including the disabled band (as suggested in [1]).

[0205] ■ The switching interval location is determined by including the disabled band.

[0206] ◆ Or, when determining the switching section location, the priority of the disabled band is determined by applying the method of [2-3].

[0207] - Method 4:

[0208] ■ The switching interval length is determined without including the disabled band.

[0209] ■ The switching interval location is determined without including the disabled band.

[0210] [3-2] If one or more of the bands included in a specific UL Tx switching (or among the switch-to bands) is a disabled band(s), the disabled band(s) may be excluded from the bands included in the Tx switching.

[0211] - For example, when the switch-from band is A(1T)+B(1T) or A(2T), and 1-port UL transmission occurs in band C (scheduling via UL grant or UL transmission set to a higher layer), and if the associated band set to band C (via RRC, etc.) is band D, the switch-to band of the corresponding switching can be C(1T)+D(1T). However, if D is a disabled band, the switch-to band can be C(2T). That is, if a band (=band Y) set as an associated band for a specific band (=band X) is a disabled band, band X can operate as if no associated band is set. In other words, if 1 port UL occurs on band X, but band Y is a disabled band, it can operate as if 'twoT' is set even if 'oneT' is set for the band combination through the RRC parameter uplinkTxSwitching-DualUL-TxState, just as if the band associated with band X is not set.

[0212] At this time, the switching section length determination method mentioned in [1] above and / or the switching section position determination method mentioned in [2] above may be applied as one of the following.

[0213] - Method 1:

[0214] ■ The switching interval length is determined by including the disabled band.

[0215] ■ The switching interval location is determined by including the disabled band.

[0216] ◆ Or, when determining the switching section location, the priority of the disabled band is determined by applying the method of [2-3].

[0217] - Method 2:

[0218] ■ The switching interval length is determined by including the disabled band.

[0219] ■ The switching interval location is determined without including the disabled band (as suggested in [2]).

[0220] - Method 3:

[0221] ■ The switching interval length is determined without including the disabled band (as suggested in [1]).

[0222] ■ The switching interval location is determined by including the disabled band.

[0223] ◆ Or, when determining the switching section location, the priority of the disabled band is determined by applying the method of [2-3].

[0224] - Method 4:

[0225] ■ The switching interval length is determined without including the disabled band.

[0226] ■ The switching interval location is determined without including the disabled band.

[0227] [4] If one or more of the bands included in the UL Tx switching are disabled band(s), a method of switching the Tx chain located in the disabled band(s) to another band.

[0228] [4-1] If one or more of the band(s) included in a specific UL Tx switching is a disabled band(s), the Tx chain in the disabled band(s) may be switched to one of the enabled band(s) (even if UL transmission is not scheduled / configured by UL grant or higher layer). In this specification, the switching in 4-1 may be referred to as implicit switching.

[0229] [4-2] For the above implicit switching, the band to which the Tx chain in the disabled band will be switched can be determined using one of the following methods.

[0230] - Method 1: A Tx chain in a disabled band can be switched to the band with the highest priority among the bands set for UL Tx switching.

[0231] ■ If both Tx chains are located in a disabled band, both Tx chains can be switched to the band with the highest priority.

[0232] ■ If one Tx chain (=Tx chain #1) is located in a disabled band and the remaining Tx chain (=Tx chain #2) is located in another band, only the Tx chain in the disabled band can be switched to the band with the highest priority.

[0233] ◆ Alternatively, (in this case, if the band with the highest priority and the band where Tx chain #2 is located are set to switchedUL) both Tx chains can be switched to the band with the highest priority.

[0234] - Method 2: The band to which the Tx chain in the disabled band will be switched can be set via RRC.

[0235] - Method 3: The band to switch the Tx chain located in the disabled band can be set / instructed via MAC-CE (or DCI) to trigger deactivation.

[0236] ■ If one Tx chain (=Tx chain #1) is located in a disabled band and the remaining one Tx chain (=Tx chain #2) is located in another band, it can also be set / indicated whether only Tx chain #1 or both Tx chains #1 and #2 are switched.

[0237] ■ The above MAC-CE may mean a MAC-CE for setting / instructing S-cell deactivation or S-cell dormancy, and the above DCI may mean a DCI for instructing S-cell dormancy.

[0238] [4-3] For the above implicit switching, when a Tx chain in a disabled band (=band#X) is switched to another band (=band#Y), the switching interval length for the switching may be applied as the switching interval length reported for the band pair {band#X,band#Y}.

[0239] If one Tx chain is located in a disabled band (=band#1) and the remaining one Tx chain is located in another band (=band#2), and both of the two Tx chains are switched to a specific other band (=band#3), the switching interval length can be determined as the larger value between the switching interval length for the band pair {band#1,band#3} and the switching interval length for the band pair {band#2,band#3}.

[0240] [4-4] For the above implicit switching, when a Tx chain in a disabled band (=band#X) is switched to another band (=band#Y), the switching section position for the switching can be determined as the disabled band.

[0241] If one Tx chain is located in a disabled band (=band#1) and the remaining one Tx chain is located in another band (=band#2), and the two Tx chains are switched to a specific other band (=band#3), the switching section positions can be determined as band#1 and band#2.

[0242] [4-5] For the above implicit switching, the point in time (=T1) at which the Tx chain in the deactivated band is switched can be the earliest UL slot or UL symbol after the (application) delay required for S-cell (de)activation or S-cell dormant operation through MAC-CE or DCI defined in the conventional NR.

[0243] If a new UL Tx switching is triggered by a UL grant or upper layer configuration occurring before the T1 time point (and after the MAC-CE, DCI for deactivation is received), the implicit switching can be cancelled.

[0244] Alternatively, if the above implicit switching is triggered, a new UL Tx switching (due to UL grant or higher layer configuration) may not occur until the Tx chain in the disabled band is switched to another band. That is, the terminal may expect this, and if there is a UL UL grant or higher layer configuration that can trigger a new Tx switching under this condition, the terminal may drop it.

[0245] Meanwhile, the present invention is not limited to the transmission and reception of uplink and / or downlink signals. For example, the present invention can also be used in direct communication between terminals. Furthermore, the base station in the present invention may include not only a base station but also a relay node. For example, the base station operations in the present invention may be performed by the base station, but may also be performed by a relay node.

[0246] It is clear that the examples of the proposed methods described above can also be considered as a type of proposed methods, as they can be included as one of the implementation methods of the present invention. In addition, the proposed methods described above can be implemented independently, but can also be implemented in the form of a combination (or merge) of some of the proposed methods. Information on whether the proposed methods are applicable (or information on the rules of the proposed methods) can be defined as a rule so that the base station notifies the terminal or the transmitting terminal notifies the receiving terminal through a predefined signal (e.g., a physical layer signal or a higher layer signal).

[0247] Implementation example

[0248] Figure 5 is a flowchart of a signal transmission and reception method according to embodiments of the present invention.

[0249] Referring to FIG. 5, a signal transmission and reception method according to an embodiment of the present invention may be performed by a terminal, and may be configured to include a step of setting at least three uplink bands (S501), and a step of performing uplink transmissions on all or part of the at least three uplink bands (S503). A signal transmission and reception method by a base station corresponding to the embodiment of the present invention of FIG. 5 may be configured to include a step of setting at least three uplink bands in a terminal (S501), and a step of receiving uplink transmissions from the terminal on all or part of the at least three uplink bands (S503).

[0250] As previously described, embodiments of the present disclosure relate to uplink transmissions and uplink switching occurring between three or four uplink bands. When an uplink transmission occurs on all or some of the three or four uplink bands, at least one of the two Tx chains is switched from one or two switch-from bands to one or two switch-to bands.

[0251] With respect to an uplink switching, uplink transmission may occur in the switch-from band(s), but the switch-from band(s) may also be in a state (where the Tx chain is positioned) that can support uplink transmission without scheduling uplink transmission. At least one of the switch-to band(s) is scheduled for uplink transmission.

[0252] With respect to uplink bands associated with a single uplink switching operation, the length of the switching interval for the combinable uplink band pairs may be reported as a terminal capability. Based on the length of the reported switching interval and the priority for each uplink band, the location and length of the switching interval where uplink transmission is actually skipped may be determined. The switching interval determined by the methods in [1] to [4] may be referred to as a switching gap.

[0253] In this specification, deactivation of a specific band among the bands associated with uplink switching means that all cells within the specific band are deactivated or dormant. Accordingly, activation of a specific band means that at least one cell within the specific band is neither a deactivated cell nor a dormant cell.

[0254] Referring to Section [1], if specific band(s) among the bands included in uplink switching are deactivated, the length of the switching interval (switching gap) may be determined as the length of the longest switching interval among the switching intervals for each band pair reported as the terminal capability, excluding the switching intervals associated with the specific band(s). For specific examples according to the number of bands and the location of the deactivated bands, reference may be made to Embodiments 1 and 2 of Section [1].

[0255] Referring to Section [2-1], when specific band(s) among the bands included in the uplink switching are disabled, the position of the switching interval (switching gap) may be determined based on the band(s) with the highest priority, excluding the specific band(s) that are disabled among the band(s) included in the uplink switching. Specifically, when the position of the band with the highest priority is one of the switch-from band and the switch-to band, the position of the switching gap may be determined as a band in which the band with the highest priority is not located among the switch-from band and the switch-to band. For specific examples according to the number of bands and the positions of the disabled bands, reference may be made to Embodiments 1 and 2 of Section [2-1].

[0256] Referring to Section [2-2], when specific band(s) among the bands included in the uplink switching are deactivated, the position of the switching interval (switching gap) may be determined based on the band with the highest priority among the remaining bands, while considering the priority of the specific band(s) that are deactivated among the band(s) included in the uplink switching as the lowest. Specifically, when the position of the band with the highest priority is one of the switch-from band and the switch-to band, the position of the switching gap may be determined as a band in which the band with the highest priority among the switch-from band and the switch-to band is not located. Specific examples according to the number of bands and the positions of the deactivated bands may refer to Embodiments 1 to 4 of Section [2-2].

[0257] In [2-1] and [2-2], if the priority among uplink bands changes due to a specific band(s) being disabled, the location of the switching gap may change compared to when there is no specific band being disabled.

[0258] Referring to section [4], if a specific band(s) among the bands included in the uplink switching is deactivated, even if uplink transmission is not scheduled for at least three uplink bands, uplink switching may be triggered so that the Tx chain(s) located in the deactivated specific band(s) may be switched to the activated band(s). The Tx chain may be switched to a band with the highest priority among the bands included in the uplink switching, or to a band indicated by DCI or MAC-CE.

[0259] In addition to the operations described with respect to FIG. 5, one or more of the operations described with respect to FIGS. 1 to 4 and / or the operations described in sections [1] to [3] may be additionally performed in combination.

[0260] Examples of communication systems to which the present invention is applied

[0261] Although not limited thereto, the various descriptions, functions, procedures, proposals, methods and / or operational flowcharts of the present invention disclosed in this document may be applied to various fields requiring wireless communication / connection (e.g., 5G) between devices.

[0262] Hereinafter, more specific examples will be provided with reference to the drawings. In the drawings / descriptions below, the same drawing reference numerals may represent identical or corresponding hardware blocks, software blocks, or functional blocks, unless otherwise described.

[0263] Figure 6 illustrates a communication system (1) applied to the present invention.

[0264] Referring to FIG. 6, a communication system (1) applied to the present invention includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using a wireless access technology (e.g., 5G NR (New RAT), LTE (Long Term Evolution)) and may be referred to as a communication / wireless / 5G device. Although not limited thereto, the wireless device may include a robot (100a), a vehicle (100b-1, 100b-2), an XR (eXtended Reality) device (100c), a hand-held device (100d), a home appliance (100e), an IoT (Internet of Things) device (100f), and an AI device / server (400). For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing vehicle-to-vehicle communication, etc. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices, and can be implemented in the form of HMD (Head-Mounted Device), HUD (Head-Up Display) installed in a vehicle, television, smartphone, computer, wearable device, home appliance, digital signage, vehicle, robot, etc. Mobile devices can include smartphone, smart pad, wearable device (e.g., smart watch, smart glass), computer (e.g., laptop, etc.), etc. Home appliances can include TV, refrigerator, washing machine, etc. IoT devices can include sensors, smart meters, etc. For example, base stations and networks can also be implemented as wireless devices, and a specific wireless device (200a) can act as a base station / network node to other wireless devices.

[0265] Wireless devices (100a to 100f) can be connected to a network (300) via a base station (200). Artificial Intelligence (AI) technology can be applied to the wireless devices (100a to 100f), and the wireless devices (100a to 100f) can be connected to an AI server (400) via the network (300). The network (300) can be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, etc. The wireless devices (100a to 100f) can communicate with each other via the base station (200) / network (300), but can also communicate directly (e.g., sidelink communication) without going through the base station / network. For example, vehicles (100b-1, 100b-2) can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to Everything) communication). In addition, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices (100a to 100f).

[0266] Wireless communication / connection (150a, 150b, 150c) can be established between wireless devices (100a~100f) / base stations (200), and base stations (200) / base stations (200). Here, wireless communication / connection can be achieved through various wireless access technologies (e.g., 5G NR) such as uplink / downlink communication (150a), sidelink communication (150b) (or D2D communication), and communication between base stations (150c) (e.g., relay, IAB (Integrated Access Backhaul). Through wireless communication / connection (150a, 150b, 150c), wireless devices and base stations / wireless devices, and base stations and base stations can transmit / receive wireless signals to each other. For example, wireless communication / connection (150a, 150b, 150c) can transmit / receive signals through various physical channels. To this end, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes can be performed based on various proposals of the present invention.

[0267] Examples of wireless devices to which the present invention is applied

[0268] Figure 7 illustrates a wireless device applicable to the present invention.

[0269] Referring to FIG. 7, the first wireless device (100) and the second wireless device (200) can transmit and receive wireless signals through various wireless access technologies (e.g., LTE, NR). Here, {the first wireless device (100), the second wireless device (200)} can correspond to {the wireless device (100x), the base station (200)} and / or {the wireless device (100x), the wireless device (100x)} of FIG. 6.

[0270] A first wireless device (100) includes one or more processors (102) and one or more memories (104), and may further include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memories (104) and / or the transceivers (106), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (102) may process information in the memory (104) to generate first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver (106). In addition, the processor (102) may receive a wireless signal including second information / signal via the transceiver (106), and then store information obtained from signal processing of the second information / signal 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 perform some or all of the processes controlled by the processor (102), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (102) and the memory (104) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals via one or more antennas (108). The transceiver (106) may include a transmitter and / or a receiver. The transceiver (106) may be used interchangeably with an RF (Radio Frequency) unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0271] The second wireless device (200) includes one or more processors (202), one or more memories (204), and may further include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memories (204) and / or the transceivers (206), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202) may process information in the memory (204) to generate third information / signals, and then transmit a wireless signal including the third information / signals via the transceivers (206). Furthermore, the processor (202) may receive a wireless signal including fourth information / signals via the transceivers (206), and then store information obtained from signal processing of the fourth information / signals in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may perform some or all of the processes controlled by the processor (202), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (202) and the memory (204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals via one or more antennas (208). The transceiver (206) may include a transmitter and / or a receiver. The transceiver (206) may be used interchangeably with an RF unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0272] Hereinafter, the hardware elements of the wireless device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors (102, 202) may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed herein, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) can receive signals (e.g., baseband signals) from one or more transceivers (106, 206) and obtain PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed herein.

[0273] One or more processors (102, 202) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. One or more processors (102, 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, 202). The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software configured to perform one or more processors (102, 202) or stored in one or more memories (104, 204) and executed by one or more processors (102, 202). The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions.

[0274] One or more memories (104, 204) may be coupled to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories (104, 204) may be configured as ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories (104, 204) may be located internally and / or externally to the one or more processors (102, 202). Additionally, the one or more memories (104, 204) may be coupled to the one or more processors (102, 202) via various technologies, such as wired or wireless connections.

[0275] One or more transceivers (106, 206) can transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or flowcharts of this document, to one or more other devices. One or more transceivers (106, 206) can receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts of this document, from one or more other devices. For example, one or more transceivers (106, 206) can be connected to one or more processors (102, 202) and can transmit and receive wireless signals. For example, one or more processors (102, 202) can control one or more transceivers (106, 206) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (102, 202) may control one or more transceivers (106, 206) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (106, 206) may be coupled to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and receive user data, control information, wireless signals / channels, or the like, as referred to in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein, via one or more antennas (108, 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, 206) can convert received user data, control information, wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using one or more processors (102, 202).One or more transceivers (106, 206) may convert user data, control information, wireless signals / channels, etc. processed by one or more processors (102, 202) from baseband signals to RF band signals. For this purpose, one or more transceivers (106, 206) may include an (analog) oscillator and / or filter.

[0276] Examples of wireless devices to which the present invention is applied

[0277] Figure 8 illustrates another example of a wireless device applicable to the present invention. The wireless device may be implemented in various forms depending on the use case / service (see Figure 6).

[0278] Referring to FIG. 8, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 7 and may be composed of various elements, components, units / units, and / or modules. For example, the wireless device (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130), and an additional element (140). The communication unit may include a communication circuit (112) and a transceiver(s) (114). For example, the communication circuit (112) may include one or more processors (102, 202) and / or one or more memories (104, 204) of FIG. 7. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 7. The control unit (120) is electrically connected to the communication unit (110), the memory unit (130), and the additional elements (140) and controls the overall operation of the wireless device. For example, the control unit (120) may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit (130). In addition, the control unit (120) may transmit information stored in the memory unit (130) to an external device (e.g., another communication device) via a wireless / wired interface through the communication unit (110), or store information received from an external device (e.g., another communication device) via a wireless / wired interface in the memory unit (130).

[0279] The additional element (140) may be configured in various ways depending on the type of the wireless device. For example, the additional element (140) may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Although not limited thereto, the wireless device may be implemented in the form of a robot (Fig. 6, 100a), a vehicle (Fig. 6, 100b-1, 100b-2), an XR device (Fig. 6, 100c), a portable device (Fig. 6, 100d), a home appliance (Fig. 6, 100e), an IoT device (Fig. 6, 100f), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a fintech device (or a financial device), a security device, a climate / environmental device, an AI server / device (Fig. 6, 400), a base station (Fig. 6, 200), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0280] In FIG. 8, various elements, components, units / parts, and / or modules within the wireless device (100, 200) may be entirely interconnected via a wired interface, or at least some may be wirelessly connected via a communication unit (110). For example, within the wireless device (100, 200), the control unit (120) and the communication unit (110) may be wired, and the control unit (120) and a first unit (e.g., 130, 140) may be wirelessly connected via the communication unit (110). In addition, each element, component, unit / part, and / or module within the wireless device (100, 200) may further include one or more elements. For example, the control unit (120) may be composed of a set of one or more processors. For example, the control unit (120) may be composed of a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing processor, a memory control processor, etc. As another example, the memory unit (130) may be composed of RAM (Random Access Memory), DRAM (Dynamic RAM), ROM (Read Only Memory), flash memory, volatile memory, non-volatile memory, and / or a combination thereof.

[0281] Examples of vehicles or autonomous vehicles to which the present invention is applied

[0282] Figure 9 illustrates a vehicle or autonomous vehicle applicable to the present invention. The vehicle or autonomous vehicle may be implemented as a mobile robot, a car, a train, a manned or unmanned aerial vehicle (AV), a ship, or the like.

[0283] Referring to FIG. 9, a vehicle or autonomous vehicle (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a driving 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 blocks 110 / 130 / 140 of FIG. 8, respectively.

[0284] The communication unit (110) can transmit and receive signals (e.g., data, control signals, etc.) with external devices such as other vehicles, base stations (e.g., base stations, road side units, etc.), and servers. The control unit (120) can control elements of the vehicle or autonomous vehicle (100) to perform various operations. The control unit (120) can include an ECU (Electronic Control Unit). The drive unit (140a) can drive the vehicle or autonomous vehicle (100) on the ground. The drive unit (140a) can include an engine, a motor, a power train, wheels, brakes, a steering device, etc. The power supply unit (140b) supplies power to the vehicle or autonomous vehicle (100) and can include a wired / wireless charging circuit, a battery, etc. The sensor unit (140c) can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit (140c) may include an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an incline sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit (140d) may implement a technology for maintaining a driving lane, a technology for automatically controlling speed such as adaptive cruise control, a technology for automatically driving along a set path, a technology for automatically setting a path and driving when a destination is set, etc.

[0285] For example, the communication unit (110) can receive map data, traffic information data, etc. from an external server. The autonomous driving unit (140d) can generate an autonomous driving route and driving plan based on the acquired data. The control unit (120) can control the drive unit (140a) so that the vehicle or autonomous vehicle (100) moves along the autonomous driving route according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit (110) can irregularly / periodically acquire the latest traffic information data from an external server and can acquire surrounding traffic information data from surrounding vehicles. In addition, during autonomous driving, the sensor unit (140c) can acquire vehicle status and surrounding environment information. The autonomous driving unit (140d) can update the autonomous driving route and driving plan based on newly acquired data / information. The communication unit (110) can transmit information regarding the vehicle location, autonomous driving route, driving plan, etc. to the external server. External servers can predict traffic information data in advance using AI technology or other technologies based on information collected from vehicles or autonomous vehicles, and provide the predicted traffic information data to the vehicles or autonomous vehicles.

[0286] It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the scope of the invention. Therefore, the above detailed description should not be construed as limiting in any respect, but rather as illustrative. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the scope of equivalents of the present invention are intended to be included within the scope of the present invention.

[0287] As described above, the present invention can be applied to various wireless communication systems.

Claims

1. In a method performed by a terminal in a wireless communication system, a step of setting at least three uplink bands; and A step of performing uplink transmissions on all or part of at least three uplink bands; comprising: Uplink switching is triggered based on the above uplink transmissions, and uplink transmission is omitted during an uplink switching gap associated with the above uplink switching, Based on the deactivation of a specific band(s) among the at least three uplink bands, the length of the switching gap of the uplink switching is determined as the length of the longest switching interval among the switching intervals of each band pair reported as the terminal capability, excluding the switching intervals associated with the specific band(s). method.

2. In paragraph 1, Based on the specific band(s) among the at least three uplink bands being deactivated, the location of the switching gap of the uplink switching is determined not to be located in a band with the highest priority excluding the specific band(s) among the at least three uplink bands. method.

3. In paragraph 1, Based on the fact that a specific band(s) among the at least three uplink bands is deactivated, the priority of the specific band(s) is considered to be the lowest among the at least three uplink bands, and the location of the switching gap of the uplink switching is determined so as not to be located in the band with the highest priority among the at least three uplink bands. method.

4. In paragraph 1, Based on the fact that a specific band(s) among the at least three uplink bands is deactivated and uplink transmission is not scheduled for the at least three uplink bands, the Tx chain(s) located in the specific band(s) are switched to an activated band(s) among the at least three uplink bands. method.

5. In paragraph 4, The above Tx chain is switched to the band with the highest priority among the activated band(s). method.

6. In paragraph 4, The above Tx chain is switched to a band indicated by DCI (downlink control information) or MAC-CE (Medium Access Control-Control Element) for deactivation or dormancy of all cells belonging to the specific band(s) among the activated band(s). method.

7. In a terminal for transmitting and receiving signals in a wireless communication system, At least one transceiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform a specific operation; The above specific actions are: a step of setting at least three uplink bands; and A step of performing uplink transmissions on all or part of at least three uplink bands; comprising: Uplink switching is triggered based on the above uplink transmissions, and uplink transmission is omitted during an uplink switching gap associated with the above uplink switching, Based on the deactivation of a specific band(s) among the at least three uplink bands, the length of the switching gap of the uplink switching is determined as the length of the longest switching interval among the switching intervals of each band pair reported as the terminal capability, excluding the switching intervals associated with the specific band(s). Terminal.

8. In paragraph 7, Based on the specific band(s) among the at least three uplink bands being deactivated, the location of the switching gap of the uplink switching is determined not to be located in a band with the highest priority excluding the specific band(s) among the at least three uplink bands. Terminal.

9. In paragraph 7, Based on the fact that a specific band(s) among the at least three uplink bands is deactivated, the priority of the specific band(s) is considered to be the lowest among the at least three uplink bands, and the location of the switching gap of the uplink switching is determined so as not to be located in the band with the highest priority among the at least three uplink bands. Terminal.

10. In paragraph 7, Based on the fact that a specific band(s) among the at least three uplink bands is deactivated and uplink transmission is not scheduled for the at least three uplink bands, the Tx chain(s) located in the specific band(s) are switched to an activated band(s) among the at least three uplink bands. Terminal.

11. In paragraph 10, The above Tx chain is switched to the band with the highest priority among the activated band(s). Terminal.

12. In paragraph 10, The above Tx chain is switched to a band indicated by DCI (downlink control information) or MAC-CE (Medium Access Control-Control Element) for deactivation or dormancy of all cells belonging to the specific band(s) among the activated band(s). Terminal.

13. In a device for a terminal, at least one processor; and At least one computer memory operably connected to said at least one processor and configured to, when executed, cause said at least one processor to perform operations, said operations comprising: a step of setting at least three uplink bands; and A step of performing uplink transmissions on all or part of at least three uplink bands; comprising: Uplink switching is triggered based on the above uplink transmissions, and uplink transmission is omitted during an uplink switching gap associated with the above uplink switching, Based on the deactivation of a specific band(s) among the at least three uplink bands, the length of the switching gap of the uplink switching is determined as the length of the longest switching interval among the switching intervals of each band pair reported as the terminal capability, excluding the switching intervals associated with the specific band(s). device.

14. A computer-readable non-volatile storage medium comprising at least one computer program that causes a terminal including at least one processor to perform an operation, the operation comprising: a step of setting at least three uplink bands; and A step of performing uplink transmissions on all or part of at least three uplink bands; comprising: Uplink switching is triggered based on the above uplink transmissions, and uplink transmission is omitted during an uplink switching gap associated with the above uplink switching, Based on the deactivation of a specific band(s) among the at least three uplink bands, the length of the switching gap of the uplink switching is determined as the length of the longest switching interval among the switching intervals of each band pair reported as the terminal capability, excluding the switching intervals associated with the specific band(s). Storage media.

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