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

Abstract

In a wireless communication system according to the present invention, a method and apparatus for transmitting and receiving signals performs uplink switching among three or more bands. When there is only one-port transmission on a carrier wave of one band as transmission after uplink switching, a method is disclosed for determining in which band after uplink switching one of two Tx chains is located, the one Tx chain not used for the one-port transmission.

Description

[Technical Field]

[0001] The present invention relates to a method and apparatus for use in a wireless communication system. [Background technology]

[0002] Wireless communication systems have been widely deployed to provide various communication services such as voice and data. Generally, wireless communication systems are multiple access systems that can support communication with multiple users by sharing available system resources (such as bandwidth and transmission power). Examples of multiple access systems include Code Division Multiple Access (CDMA) systems, Frequency Division Multiple Access (FDMA) systems, Time Division Multiple Access (TDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, and Single Carrier Frequency Division Multiple Access (SC-FDMA) systems. Summary of the Invention [Problem to be solved by the invention]

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

[0004] The technical object of the present invention is not limited to the above-mentioned technical object, and other technical objects can be inferred from the embodiments of the present invention. [Means for solving the problem]

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

[0006] As one embodiment of the present invention, there is provided a method for a terminal (UE) to transmit and receive signals in a wireless communication system, the method comprising: setting an uplink band including a first band, a second band, and a third band; receiving (i) a first parameter for indicating a state of a Tx chain if the state of the Tx chain is not unique after uplink switching, and (ii) a second parameter for setting an associated band for the third band; and performing, in an operating state in which one-port transmission (first transmission) can be supported on each carrier of the first band and the second band, one-port transmission (second transmission) on a carrier of the third band without transmitting on the first band and the second band, wherein the uplink switching is performed based on the second transmission, and the terminal considers that one-port transmission has been performed on each carrier of the third band and the associated band based on the value of the first parameter indicating one Tx chain and the associated band being set by the second parameter, for the uplink switching.

[0007] As another embodiment of the present invention, there is provided a method for a base station (BS) to transmit and receive signals in a wireless communication system, the method comprising the steps of: configuring an uplink band including a first band, a second band, and a third band for a terminal; transmitting to the terminal (i) a first parameter for indicating a state of the Tx chain if the state of the Tx chain is not unique after uplink switching, and (ii) a second parameter for setting an associated band for the third band; and receiving a one-port transmission (second transmission) on a carrier of the third band without a transmission in the first band and the second band from the terminal in an operating state capable of supporting one-port transmission (first transmission) on each carrier of the first band and the second band, wherein the uplink switching is performed based on the second transmission, and the base station considers that one-port transmission has been performed on each carrier of the third band and the associated band based on the value of the first parameter indicating one Tx chain and the associated band being set by the second parameter.

[0008] In another embodiment of the present invention, an apparatus, a processor, and a storage medium for performing the signal transmission and reception method are provided.

[0009] The device includes an autonomous vehicle capable of communicating with at least a terminal, a network, and other autonomous vehicles other than the device.

[0010] The above-described aspects of the present invention are merely some of the preferred embodiments of the present invention, and various embodiments reflecting the technical features of the present invention will be apparent to those skilled in the art based on the detailed description of the present invention below. [Effects of the Invention]

[0011] According to one embodiment of the present invention, when signals are transmitted and received between communication devices, there is an advantage that signals can be transmitted and received more efficiently due to an operation that is differentiated from the conventional invention.

[0012] The technical effects of the present invention are not limited to the above-mentioned technical effects, and other technical effects may be inferred from the embodiments of the present invention. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram illustrating the structure of a radio frame. [Figure 2] FIG. 1 illustrates a resource grid of slots. [Figure 3] FIG. 10 is a diagram showing an example of mapping physical channels within a slot. [Figure 4] 1 is a diagram illustrating a signal transmission and reception method according to an embodiment of the present invention. [Figure 5] 1 is a diagram illustrating a signal transmission and reception method according to an embodiment of the present invention. [Figure 6] 1 illustrates an apparatus according to one embodiment of the present invention. [Figure 7] 1 illustrates an apparatus according to one embodiment of the present invention. [Figure 8] 1 illustrates an apparatus according to one embodiment of the present invention. [Figure 9] 1 illustrates an apparatus according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] The following technologies can be used for various wireless access systems, such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, etc. CDMA can be implemented by radio technologies such as UTRA (Universal Terrestrial Radio Access) and CDMA2000. TDMA can be implemented by radio technologies such as GSM (Global System for Mobile communications), GPRS (General Packet Radio Service), and EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented by radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (Evolved UTRA), etc. UTRA is part of UMTS (Universal Mobile Telecommunications System). 3GPP (registered trademark) (3rd Generation Partnership Project) LTE (long term evolution) is a part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A / LTE-A pro are evolved versions of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0015] For clarity, the following description will be based on a 3GPP communication system (e.g., LTE-A, NR), but the technical concept of the present invention is not limited thereto. LTE refers to technology from 3GPP TS 36.xxx Release 8 onward. Specifically, LTE technology from 3GPP TS 36.xxx Release 10 onward is called LTE-A, and LTE technology from 3GPP TS 36.xxx Release 13 onward is called LTE-A pro. 3GPP NR refers to technology from TS 38.xxx Release 15 onward. LTE / NR can also be referred to as a 3GPP system. "xxx" refers to the specific number of the standard document. LTE / NR is collectively referred to as a 3GPP system. For background technology, terms, abbreviations, etc. used in the description of the present invention, please refer to the matters described in standard documents published before the present invention. For example, the following documents may be referenced:

[0016] 3GPP NR

[0017] - 38.211: Physical channels and modulation

[0018] - 38.212: Multiplexing and channel coding

[0019] - 38.213: Physical layer procedures for control

[0020] - 38.214: Physical layer procedures for data

[0021] - 38.300: NR and NG-RAN Overall Description

[0022] - 38.331: Radio Resource Control (RRC) protocol specification

[0023] FIG. 1 illustrates the structure of a radio frame used in NR.

[0024] In NR, uplink and downlink transmissions are composed of frames. A radio frame has a length of 10 ms and is defined as two 5 ms half-frames (Half-Frame, HF). A half-frame is defined as five 1 ms subframes (Subframe, 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). If a regular CP is used, each slot contains 14 symbols. If an extended CP is used, each slot contains 12 symbols. Here, a symbol can include an OFDM symbol (or a CP-OFDM symbol) or an SC-FDMA symbol (or a DFT-s-OFDM symbol).

[0025] Table 1 illustrates that when a general CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe change depending on the SCS.

[0026] [Table 1] * N slot symb : Number of symbols in the slot * N frame,u slot : Number of slots in the frame * N subframe,u slot : Number of slots in a subframe

[0027] Table 2 illustrates how the number of symbols per slot, the number of slots per frame, and the number of slots per subframe change depending on the SCS when an extended CP is used.

[0028] [Table 2]

[0029] In an NR system, multiple cells merged to one user equipment (UE) are configured to have different OFDM(A) pneumatics (e.g., SCS, CP length, etc.), which results in different (absolute time) durations of time resources (e.g., SF, slot, or TTI) (collectively referred to as TU (Time Unit) for convenience) consisting of the same number of symbols.

[0030] NR supports multiple Orthogonal Frequency Division Multiplexing (OFDM) pneumonologies (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 supports dense urban areas, lower latency, and wider carrier bandwidths.

[0031] The NR frequency band is defined by two types of frequency ranges (FR) (FR1 / FR2). FR1 / FR2 are configured as shown in Table 3 below. FR2 also stands for millimeter wave (mmW).

[0032] [Table 3]

[0033] Figure 2 illustrates the slot structure of an NR frame.

[0034] A slot contains multiple symbols in the time domain. For example, in the case of a general CP, one slot contains 14 symbols, while in the case of 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 (or simply, interlaces) are defined in the frequency domain. Interlace m ∈ {0, 1, ..., M-1} consists of (common) RBs {m, M+m, 2M+m, 3M+m, ...}, where M represents the number of interlaces. A BWP (Bandwidth Part) is defined as multiple consecutive PRBs (Physical RBs) in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier contains up to N BWPs (e.g., 5). Data communication is performed using activated BWPs, and only one BWP can be activated for one terminal. Each element in the resource grid is called a resource element (RE), and one modulation symbol can be mapped to it.

[0035] In a wireless communication system, a terminal receives information from a base station via a downlink (DL), and the terminal transmits information to the base station via an uplink (UL). Information exchanged 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 exchanged. A physical channel corresponds to a set of resource elements (RE) that carry information derived from a higher layer. A physical signal corresponds to a set of resource elements (RE) used by a physical layer (PHY), but does not carry information derived from a higher layer. Higher layers include 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, etc.

[0036] DL physical channels include PBCH (Physical Broadcast channel), PDSCH (Physical Downlink Shared channel), and PDCCH (Physical Downlink Control channel). DL physical signals include DL RS (Reference Signal), PSS (Primary synchronization signal), and SSS (Secondary synchronization signal). DL RSs include DM-RS (Demodulation RS), PT-RS (Phase-tracking RS), and CSI-RS (Channel-state information RS). UL physical channels include PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel), and PUCCH (Physical Uplink Control Channel). UL physical signals include UL RSs. UL RSs include DM-RS, PT-RS, and SRS (Sounding RS).

[0037] FIG. 3 shows an example of mapping physical channels into slots.

[0038] A single slot contains the DL control channel, DL or UL data, and UL control channel. For example, the first N symbols in a slot are used to transmit the DL control channel (hereinafter referred to as the DL control region), and the last M symbols in a slot are used to transmit the UL control channel (hereinafter referred to as the UL control region). N and M are integers equal to or greater than 0. The resource region between the DL control region and the UL control region (hereinafter referred to as the data region) is used to transmit DL data or UL data. A time gap exists between the control region and the data region for DL-to-UL or UL-to-DL switching. The PDCCH is transmitted in the DL control region, and the PDSCH is transmitted in the DL data region. Some symbols at the time of switching from DL to UL within a slot are used as the time gap.

[0039] The base station is, for example, a gNodeB.

[0040] Uplink (UL) physical channels / signals

[0041] (1) PUSCH

[0042] The PUSCH carries uplink data (e.g., UL-SCH TB) and / or uplink control information (UCI) and is transmitted based on a cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) waveform. When the PUSCH is transmitted based on a DFT-s-OFDM waveform, the terminal applies transform precoding to transmit the PUSCH. For example, when transform precoding is not possible (e.g., transform precoding is disabled), the terminal transmits the PUSCH based on the CP-OFDM waveform, and when transform precoding is possible (e.g., transform precoding is enabled), the terminal transmits the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. The PUSCH is dynamically scheduled by the 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 the PDCCH, while in CS, PUSCH transmission is not accompanied by the PDCCH. CS includes Type-1 CG (Configured Grant) PUSCH transmission and Type-2 CG PUSCH transmission. In Type-1 CG, all parameters for PUSCH transmission are signaled by a higher layer. In Type-2 CG, some parameters for PUSCH transmission are signaled by a higher layer, and the rest are signaled by the PDCCH. Basically, in CS, PUSCH transmission is not accompanied by the PDCCH.

[0043] (2) PUCCH

[0044] The PUCCH carries Uplink Control Information (UCI), which includes:

[0045] - SR (Scheduling Request): Information used to request UL-SCH resources

[0046] - HARQ-ACK (Hybrid Automatic Repeat and reQuest Acknowledgement): A reception acknowledgement signal for DL ​​signals (e.g., PDSCH, SPS release PDCCH). HARQ-ACK responses include positive ACK (simply ACK), negative ACK (NACK), DTX (Discontinuous Transmission), or NACK / DTX. HARQ-ACK is also used interchangeably with A / N, ACK / NACK, HARQ-ACK / NACK, etc. HARQ-ACK is generated on a TB-by-TB / CBG-by-CBG basis.

[0047] CSI (Channel Status Information): Feedback information for the DL channel. CSI includes CQI (Channel Quality Information), RI (Rank Indicator), PMI (Precoding Matrix Indicator), PTI (Precoding Type Indicator), etc.

[0048] Table 4 shows examples of PUCCH formats. PUCCH formats are classified according to the size of the UCI payload, transmission length (e.g., the number of symbols constituting the PUCCH resource), and transmission structure. PUCCH formats are classified into Short PUCCH (formats 0 and 2) and Long PUCCH (formats 1, 3, and 4) according to the transmission length.

[0049] [Table 4]

[0050] (0) PUCCH Format 0 (PF0)

[0051] - Supported UCI payload size: up to K bits (e.g., K = 2)

[0052] - Number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., X = 2)

[0053] - Transmission structure: Consists of only UCI signals without DM-RS, and transmits UCI status by selecting and transmitting one of multiple sequences.

[0054] (1) PUCCH Format 1 (PF1)

[0055] - Supported UCI payload size: up to K bits (e.g., K = 2)

[0056] Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y = 4, Z = 14)

[0057] - Transmission structure: DM-RS and UCI are configured in TDM format on different OFDM symbols, and UCI is a form in which a specific sequence is modulated (e.g., QPSK) symbols are multiplied. CS (cyclic shift) / OCC (orthogonal cover code) is applied to both UCI and DM-RS, and CDM is supported between multiple PUCCH resources (according to PUCCH format 1) (within the same RB).

[0058] (2) PUCCH Format 2 (PF2)

[0059] - Supported UCI payload size: up to K bits (e.g., K = 2)

[0060] - Number of OFDM symbols constituting a single PUCCH: 1 to x symbols (e.g., X = 2)

[0061] - Transmission structure: DMRS and UCI are configured / mapped in the same symbol in the form of FDM, and the coded UCI bits are transmitted by applying only IFFT without DFT.

[0062] (3) PUCCH Format 3 (PF3)

[0063] - Supported UCI payload size: K bits or more (e.g., K=2)

[0064] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y = 4, Z = 14)

[0065] - Transmission structure: DMRS and UCI are configured / mapped to different symbols in TDM format, and the coded UCI bits are transmitted after applying DFT. OCC is applied to UCI before DFT, and CS (or IFDM mapping) is applied to DMRS, supporting multiplexing to multiple terminals.

[0066] (4) PUCCH Format 4 (PF4 or F4)

[0067] - Supported UCI payload size: K bits or more (e.g., K=2)

[0068] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y = 4, Z = 14)

[0069] Transmission structure: DMRS and UCI are configured / mapped to different symbols in TDM format, and the coded UCI bits are transmitted without inter-terminal multiplexing by applying DFT.

[0070] Uplink switching with 3 or 4 uplink bands

[0071] The above content can be applied in combination with the method proposed in the present invention to be described later, or is supplemented to clarify the technical features of the method proposed in the present invention.

[0072] In addition, the method described below can be similarly applied to the aforementioned NR system (licensed band) or shared spectrum, and of course can be modified or substituted according to the terms, expressions, structures, etc. defined in each system so that the technical ideas proposed in the present invention can be embodied in those systems as well.

[0073] Generally, the number of antennas that can be installed in a UE is limited due to its size. A UE with N transmit chains via N antennas can simultaneously support up to N single-port UL transmissions or up to N-port UL transmissions. A method for supporting UEs with limited transmit chains to efficiently perform UL transmissions is required. Hereinafter, an embodiment of the present invention related to UL transmission (Tx) switching will be described. Since most UEs developed to date support up to two Tx chains, the following description will be given assuming that the UE supports up to two Tx chains, i.e., UL transmission via up to two ports. However, the embodiment of the present invention is not limited to single-port or two-port UL transmission, and can also be applied to N-port UL transmission, where N is greater than 2.

[0074] FIG. 4 is a diagram illustrating the concept of uplink transmission switching.

[0075] To increase the throughput and efficiency of UL transmission, NR Rel-16 specifies UL Tx Switching (UTS), which switches Tx chains connected to UL carriers under predetermined conditions, with the aim of enabling a UE to effectively perform 1-port UL transmission or 2-port UL transmission using up to two Tx chains. Figure 4(a) shows 1Tx-2Tx switching between two carriers / bands, and Figure 4(b) shows 2Tx-2Tx switching between two carriers / bands.

[0076] For example, if UL transmission (hereinafter referred to as the previous transmission) is performed using one Tx chain on carrier #1, and then UL transmission (hereinafter referred to as the current transmission) is configured / instructed to be performed using two Tx chains on carrier #2, the UE switches the Tx chain connected to carrier #1 to carrier #2, enabling two-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. NR Rel-17 introduces additional conditions to extend the 1Tx-2Tx switching (i.e., switching between 1Tx chain and 2Tx chain) of the conventional NR Rel-16 to 2Tx-2Tx switching (i.e., switching between 2Tx chain and 2Tx chain), and at the same time, extends the UTS between two carriers introduced in NR Rel-16 to also be performed between two different bands (e.g., one carrier in one band and two contiguous carriers in another band).

[0077] If a predetermined condition is met and the UE is configured for uplinkTxSwitching via RRC signaling, the UE may omit uplink transmission during an uplink switching gap NTx1-Tx2. For example, if a predetermined condition is met and the UE is configured for uplinkTxSwitching via RRC signaling, the UE may omit uplink transmission during an uplink switching gap NTx1-Tx2. Tx1-Tx2During this period, all UL transmissions, including UL transmissions scheduled via DCI and UL transmissions configured via higher layer signaling (e.g., configured grant-based PUSCH), are omitted. The switching gap NTx1-Tx2 is indicated by uplinkTxSwitchingPeriod2T2T provided from the UE to the BS via a UE capability report if uplinkTxSwitching-2T-Mode is configured via RRC signaling; otherwise, it is indicated by uplinkTxSwitchingPeriod provided from the UE to the BS via a UE capability report. Here, the RRC configuration uplinkTxSwitching is included in the configuration for the serving cell and provided to the UE, and may include uplinkTxSwitchingPeriodLocation indicating whether the location of the UL Tx switching period is configured on this UL carrier in the case of inter-band UL CA, SUL, or (NG)EN-DC, and uplinkTxSwitchingCarrier indicating that 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 triggered UL switching is 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 configured, it can be interpreted as 1Tx-2Tx UTS being configured, in which case there can be one uplink (or one uplink band in the case of intra-band) configured for uplinkTxSwitching.

[0078] If the UE indicates capability for uplink switching for a band combination, and if that band combination is configured for MCG using E-UTRA radio access and SCG using NR radio access, or configured for uplink CA, or configured for a serving cell with two UL carriers in the upper layer (e.g., RRC) parameter supplementaryUplink, the switching gap may exist under certain conditions. For example, the following table is excerpted from 3GPP TS 38.214 V17.1.0 and illustrates UTS conditions.

[0079] Uplink switching is T0-T offset The UE is not expected to cancel the uplink switching if triggered for uplink transmission starting from T0, or T0-T offset Any other uplink transmission scheduled later is not expected to trigger any other new uplink switching that occurs before T0. offset is the UE processing procedure time defined for uplink transmission that triggers switching (see, for example, S5.3, S5.4, S6.2.1 and S6.4 of 3GPP TS 38.214 and S9 of 3GPP TS 38.213). UL =max(u UL,1 ,u UL,2 ), where u UL,1 corresponds to the subcarrier spacing of the active UL BWP of the uplink carrier occurring before the switching gap, and u UL,2 corresponds to the subcarrier spacing of the active UL BWP of another uplink carrier occurring after the switching gap.

[0080] [Table 5]

[0081] [Table 6]

[0082] [Table 7]

[0083] NR supports wide spectrum in various frequency ranges. Spectrum availability is expected to increase with the evolution of 5G due to the realignment of bands originally used in previous cellular generation networks. In particular, for the low-frequency FR1 band, available spectrum blocks tend to be more fragmented and distributed over narrower bandwidths. For FR2 bands and some FR1 bands, available spectrum may be even wider, necessitating the operation of multiple carriers within the band. To meet various spectrum requirements, it is important to utilize these distributed spectrum bands or wider bandwidth spectrum in a more spectrally / power-efficient and flexible manner to provide higher throughput and more appropriate coverage in the network. For multi-carrier UL operation, the current specification has several limitations. For example, a 2TX UE is configured with a maximum of two UL bands, which can be changed only by RRC reconfiguration, and UL Tx switching is only performed between the two UL bands for a 2TX UE. Instead of RRC-based cell reconfiguration, dynamically selecting carriers with UL Tx switching based on, for example, data traffic, TDD DL / UL configuration, bandwidth and channel conditions of each band, potentially leads to even higher UL data rates, spectrum utilization and UE capacity.

[0084] For higher UL data rates, spectrum utilization, and UE capacity, UTS between more than two bands is being considered. The following describes UTS trigger conditions, UTS-related configuration methods, and / or UTS operation methods required to support UTS between multiple bands (e.g., three or more bands) according to some embodiments of the present invention.

[0085] Hereinafter, the term "cell" will be interpreted according to the context. For example, a cell may refer to a serving cell. Also, a cell may consist of one DL component carrier (CC) and zero to two UL CCs, but the embodiments of the present invention described below are not limited thereto. Hereinafter, unless otherwise specified, the terms "cell" and "CC" may be used interchangeably. Also, in some embodiments of the present invention, a cell / CC may be applied to replace an (active) BWP in a serving cell. Also, unless otherwise specified, in the embodiments of the present invention described below, a cell / CC may be used as a comprehensive concept for a PCell, SCell, PsCell, etc. configured / expressed in a carrier aggregation (CA) / dual connectivity (DC) scenario.

[0086] 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. Herein, each band consists of one carrier or multiple (e.g., two) contiguous (or non-contiguous) carriers. Furthermore, the proposed method described below (unless otherwise restricted) is applicable to inter-band UL CA, intra-band UL CA, NR-DC, EN-DC, and (single) SUL scenarios, and their associated band combinations.

[0087] In the implementation of the present invention described below, the following notation will be used for convenience of explanation.

[0088] - When a UTS occurs, it is referred to as a UTS triggered event.

[0089] - Bands (or carriers) associated with UTS: means bands / carriers before and after UTS occurs.

[0090] - The Tx chain transition time caused by UTS is called a UTS gap (or UTS period). During the UTS gap, no UL transmission occurs in the band / carrier related to UTS. The UTS gap (switching gap) and UTS period (switching period) are specifically divided as follows:

[0091] □ Switching period: Switching time reported by the terminal. Basically, one of the values ​​{35us, 140us, 210us} is reported in units of a band pair consisting of two bands. For a given switching case, one value is reported in units of a band combination consisting of three or more bands. In this invention, it is also referred to as UTS period / period or switching period.

[0092] □ Switching gap: The time duration during which UL transmission in all (or some) of the bands associated with a single UL Tx switching event is restricted. The switching gap is determined by the switching interval (reported by the terminal) for that Tx switching, or by using the switching intervals of each band pair associated with that Tx switching.

[0093] For example, in a state where one Tx chain is connected to band A and one Tx chain is connected to band B, in the case of A(1T)+B(1T)->C(2T) switching in which transmission using two Tx chains occurs in band C, if the band combination {A+B, C} is reported by the terminal, the switching gap is determined to be the reported value. If not reported, the switching gap is determined to be 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 the present invention, it is also referred to as UTS gap / interval or switching interval.

[0094] - A 1Tx chain is written as 1T, and a 2Tx chain is written as 2T.

[0095] - 1-port UL transmission is designated as 1p, and 2-port UL transmission is designated as 2p.

[0096] - When 1 Tx chain or 2 Tx chains are connected to a given band A (and / or carriers belonging to band A), this state is represented as A(1T) and A(2T), respectively.

[0097] - When one Tx chain is connected to each of two given bands A (and / or carriers belonging to band A) and band B (and / or carriers belonging to band A), this state is expressed as A(1T) + B(1T).

[0098] UL transmission means any UL channel or UL signal supported in NR, etc.

[0099] - "Previous transmission" means the most recent UL transmission performed by the UE before the UTS triggering, and "current transmission" can mean the UL transmission performed by the UE immediately after (or simultaneously with) the UTS triggering. Also, in the following, "transmission" can mean "UL transmission".

[0100] The expression that a UL transmission has occurred may refer to a UL transmission scheduled via a DCI for a UL grant and / or a UL transmission configured via higher layer signaling (e.g., RRC signaling) (e.g., a configured grant UL transmission).

[0101] - When a 1-port UL transmission occurs in a given band A (and / or a carrier belonging to band A), it is denoted as A(1p), and when a 2-port UL transmission occurs, it is denoted as A(2p).

[0102] - When one-port UL transmission occurs in each of two given bands, e.g., band A and band B (and / or carriers belonging to those bands), it is written as A(1p)+B(1p).

[0103] The RRC parameter uplinkTxSwitchingOption provided by the BS to the UE 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 switchedUL when the network configures Option 1, and to dualUL when the network configures Option 2. When the RRC value is configured to 'switchedUL' in the UE, 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) in the two bands even if one Tx chain is connected to each band. Hereinafter, this is referred to as Option 1 operation being configured. For example, a UE configured to switchedUL does not expect simultaneous transmission of A(1T) and B(1T) to be instructed / configured, and the BS does not instruct / configure simultaneous transmission of A(1T) and B(1T) to the UE. If the RRC value for a UE is set to "dualUL", the UE can expect to be scheduled / configured (or perform) simultaneous transmission in the two bands via one Tx chain connected to each of the two bands, and hereinafter this is referred to as Option 2 operation being configured.

[0104] The Tx chain is also referred to as Tx or transmitter.

[0105] Some embodiments of the present invention described below will be described focusing on the generation of UTS between two bands when four bands / carriers are configured (or activated). However, methods similar to the embodiments of the present invention described below can also be applied to UTS generated when a smaller number of bands (e.g., three) are configured / activated. Methods similar to the embodiments of the present invention described below can also be applied to UTS generated when a larger number of bands (e.g., five) are configured / activated.

[0106] Some embodiments of the present invention described below will be described without distinguishing between 1Tx-2Tx switching or 2Tx-2Tx switching, although some embodiments may be specifically applicable to 1Tx-2Tx switching and / or 2Tx-2Tx switching.

[0107] In some implementations of the present invention described below, the occurrence of "simultaneous transmission" in multiple bands may mean that the start time (e.g., start symbol) of UL transmission in each of the multiple bands coincides, and / or that some (or all) of the UL transmission resources / periods in each of the multiple bands overlap in time.

[0108] In the present invention, the symbols "-", "□", "◆", and "●" at the beginning of each paragraph indicate the vertical / horizontal relationship between each paragraph. Specifically, "-", "□", "◆", and "●" can represent higher categories in that order. For example, a "□" written next to a "-" is an additional explanation for the "-". A "◆" written next to a "□" is an additional explanation for the "□". A "●" written next to a "◆" is an additional explanation for the "◆".

[0109] [0] Explanation of conventional operation

[0110] Section [0] summarizes how to handle the case where the state of the Tx chain cannot be uniquely determined after UL Tx switching between two bands is triggered by one-port UL transmission.

[0111] In the conventional 3GPP Rel-17, UL Tx switching is set / defined in three cases as shown in Table 8 below.

[0112] [Table 8]

[0113] - In Table 8, "Number of Tx Chains" indicates the state in which Tx chains are connected to each of the two bands. If two Tx chains are connected to that band, it is shown as "2T", if one Tx chain is connected, it is shown as "1T", and if no Tx chains are connected, it is shown as "0T". For example, "1T+1T" in Case 1 means that one Tx chain is connected to each of Band A and Band B. "2T+0T" in Case 2 means that two Tx chains are connected to only Band A.

[0114] - In Table 8, "Number of antenna ports for UL transmission" refers to the number of antenna ports for UL transmission for each of the two bands. If two-port UL transmission occurs in that band, it is indicated as "2P," if one-port UL transmission occurs, it is indicated as "1P," and if no UL transmission occurs, it is indicated as "0P." For example, "1P+1P" in Case 1 means that one-port UL transmission occurs in both Band A and Band B, while "1P+0P" in Case 1 means that one-port UL transmission occurs only in Band A, and "0P+1P" means that one-port UL transmission occurs only in Band B.

[0115] - In Table 8, if the Tx chain state is like Case 1, UL Tx switching is not triggered if "1P+1P" occurs in Band A and Band B. Also, if "2P+0P" occurs in Case 2 or "0P+2P" occurs in Case 3, UL Tx switching is not triggered.

[0116] In Table 8, if the Tx chain state is Case 1, when "2P+0P" (or "0P+2P") occurs, UL Tx switching is triggered and the Tx chain in Band B (or Band A) is switched to Band A (or Band B). Also, when "1P+1P" occurs in Case 2, UL Tx switching is triggered and one Tx chain in Band A is switched to Band B. When "0P+2P" occurs in Case 2, UL Tx switching is triggered and both Tx chains in Band A are switched to Band B.

[0117] In Table 8, if the Tx chain state is Case 1, UL Tx switching may not be triggered if "1P+0P" or "0P+1P" occurs. This is because the state of Case 1 is a state in which one Tx chain is connected to each of Band A and Band B, so UL transmission corresponding to "1P+0P" and / or "0P+1P" is possible even if UL Tx switching does not occur.

[0118] Meanwhile, in the state of Case 2 in Table 8, if a 1-port UL transmission occurs in Band B, UL Tx switching can be triggered. However, if both Tx chains connected to Band A are switched to Band B, the state changes to Case 3, but if only one Tx chain is switched to Band B, the state changes to Case 1. That is, although UL Tx switching is triggered when a 1-port UL transmission occurs in Band B, the state after UL Tx switching is not uniquely determined. As a similar example, if a 1-port UL transmission occurs in Band A in the state of Case 3 in Table 8, the state of the Tx chain after UL Tx switching may be the state of Case 1 or the state of Case 2.

[0119] To solve this problem, the RRC parameter uplinkTxSwitching-DualUL-TxState was introduced in the previous 3GPP Rel-17. If the RRC setting is set to 'oneT', the UE can switch to Case 1, and if 'twoT' is set, the UE can switch to Case 2 or Case 3. This allows the state of the Tx chain to be uniquely determined after UL Tx switching.

[0120] [1] Issues in the three bands

[0121] Section [1] explains the issue of UL Tx switching between three bands when the state of the Tx chain cannot be uniquely determined after UL Tx switching is triggered by one-port UL transmission.

[0122] When UL Tx switching is configured in three bands, UL Tx switching is configured / defined in six cases as shown in Table 9 below.

[0123] [Table 9]

[0124] Other than the associated bands increasing to Band A, Band B, and Band C, all notations are the same as in Table 8.

[0125] In this case, the state of the Tx chain after UL Tx switching cannot be uniquely determined. For example, if one-port UL transmission occurs in Band C in Case 1, the state of the Tx chain after UL Tx switching can be any of Case 2, Case 3, or Case 6.

[0126] Furthermore, using the conventional RRC parameter uplinkTxSwitching-DualUL-TxState does not solve the problem. If this RRC parameter is set to "twoT", the Tx chain will be switched to Case 6 in the above example. However, if this RRC parameter is set to "oneT", the state of the Tx chain after UL TX switching may be either Case 2 or Case 3.

[0127] In Table 9, if the value of "Number of antenna ports for UL transmission" for a given Case X is the same, then all cases are likely to apply to this problem (e.g., Case 1 / 3 / 4 for "1P+0P+0P", or Case 1 / 2 / 5 for "0P+1P+0P", or Case 2 / 3 / 6 for "0P+0P+1P").

[0128] [2] Issues with the four bands

[0129] Section [2] explains the issue of UL Tx switching between four bands when the state of the Tx chain cannot be uniquely determined after UL Tx switching is triggered by one-port UL transmission.

[0130] When UL Tx switching is configured in four bands, UL Tx switching is configured / defined in 10 cases as shown in Table 10 below.

[0131] [Table 10]

[0132] Other than the associated bands increasing to Band A, Band B, Band C, and Band D, all notations are the same as in Tables 8 and 9.

[0133] In this case, the state of the Tx chain after UL Tx switching cannot be uniquely determined. For example, if one-port UL transmission occurs in Band C in Case 1, the state of the Tx chain after UL Tx switching can be any of Case 2, Case 3, Case 5, or Case 9.

[0134] Furthermore, using the conventional RRC parameter uplinkTxSwitching-DualUL-TxState does not solve the problem. That is, if this RRC parameter is set to "twoT", the Tx chain will be switched to Case 9 in the above example. However, if this RRC parameter is set to "oneT", the state of the Tx chain after UL Tx switching can be any of Case 2, Case 3, and Case 5.

[0135] In Table 10, if the value of "Number of antenna ports for UL transmission" for a given Case X is the same, then all cases are likely to apply to this problem (e.g., "1P+0P+0P+0P" for Case 1 / 4 / 5 / 7, "0P+1P+0P+0P" for Case 1 / 2 / 6 / 8, "0P+0P+1P+0P" for Case 2 / 3 / 5 / 9, and "0P+0P+0P+1P" for Case 3 / 4 / 6 / 10).

[0136] [3] Proposed method

[0137] Section [3] proposes a method to resolve the issue in the case where the state of the Tx chain cannot be uniquely determined after UL Tx switching of three or four bands is triggered by one-port UL transmission, in relation to the UL Tx switching of three or four bands described in Sections [1] and [2] above.

[0138] In the proposed method described below, bands A, B, C, and D are not terms that indicate specific bands, but rather can be understood to refer to any bands for which UL Tx switching operation is configured, and can be understood as the bands listed in Tables 9 and 10 in Sections [1] and [2] above.

[0139] In the method described below, when a predetermined band in which a Tx chain is located or switched is configured via RRC or the like, the predetermined band may be the same as the band in which 1-port UL transmission is scheduled. For example, in a situation where neither of the two Tx chains is in band A, if 1-port UL transmission is scheduled in band A and UL Tx switching is triggered, one of the two Tx chains of the UE moves to band A and the other moves to predetermined band Z. In this case, band Z can be configured for each band via RRC. Band Z may be configured as band A.

[0140] In the method described below, when a predetermined band in which a Tx chain is located or switched is configured via RRC or the like, the predetermined band may be one of the bands for which a dual UL relationship is established with a band for which 1-port UL transmission is scheduled. For example, when neither of the two Tx chains is in band A and 1-port UL transmission is scheduled in band A, thereby triggering UL Tx switching, one of the two Tx chains of the UE moves to band A and the other moves to predetermined band Z. In this case, band Z may be configured for each band via RRC. Band Z may be one of the bands for which a dual UL relationship is established with band A. The UE may not expect that the band for which a switched UL relationship is established with band A will be set to band Z. Alternatively, when the band for which a switched UL relationship is established with band A is set to band Z, the UE may move both Tx chains to band A when neither of the two Tx chains is in band A and 1-port UL transmission is scheduled in band A, thereby triggering UL Tx switching.

[0141] [3-1] How to handle the situation when there are two Tx chains in a given band (e.g., band A) and one-port UL transmission occurs only in a band other than band A (=X): At least one of the following methods (or a combination of two or more) can be applied.

[0142] - Method 1: The UE assumes that two Tx chains are located in the band (=X) in the Tx chain state after UL Tx switching. That is, in the situation where the possible cases after UL Tx switching described in Sections [1] and [2] are not the only ones, the UE changes to a state where two Tx chains are connected to band X.

[0143] - Method 2: The UE assumes that after UL Tx switching, one Tx is located in each of the band (=X) and the band (=A) where two Tx chains previously existed. That is, in the situation where the cases described in [1] and [2] are not the only cases that can occur after UL Tx switching, the UE changes to a state where one Tx chain is connected to each of band A, where two Tx chains were connected before UL Tx switching, and band X, where one-port UL transmission occurred.

[0144] - Method 3: The UE assumes that one Tx is located in the band (=X) and one predetermined band in the Tx chain state after UL Tx switching. That is, in the situation where the possible cases after UL Tx switching described in Sections [1] and [2] are not the only ones, the UE changes to a state where one Tx chain is connected to band X where one-port UL transmission occurs and one predetermined band.

[0145] At this time, the predetermined band is determined as follows.

[0146] ◆ Opt1: Predefined: The predetermined band is determined to be the band containing the lowest or highest cell / carrier index among the bands excluding band X. Alternatively, the predetermined band is determined to be the band on the lowest or highest frequency among the bands excluding band X.

[0147] ◆ Opt2: The predetermined band is configured via another RRC.

[0148] In this case, the predetermined band is one of the bands that has a dual UL relationship with the band in which one-port UL transmission is scheduled.

[0149] ◆ Opt3: If one-port UL transmission in band X is scheduled via DCI, the one predetermined band is configured / indicated via that DCI.

[0150] - Method 4: (Re)using the conventional 3GPP Rel-17 RRC parameter "uplinkTxSwitching-DualUL-TxState"

[0151] □ Opt-1: When "uplinkTxSwitching-DualUL-TxState" is set to "twoT", UL Tx switching is performed according to [Method 1] above so that two Tx chains are located in band X where one-port UL transmission occurs.When set to "oneT", UL Tx switching is performed according to [Method 2] above so that one Tx chain is located in band A where the two Tx chains were connected before UL Tx switching, and in band X where one-port UL transmission occurs.

[0152] □ Opt-2: When "uplinkTxSwitching-DualUL-TxState" is set to "twoT", UL Tx switching is performed according to [Method 1] above so that two Tx chains are located in band X where one-port UL transmission occurs.When set to "oneT", UL Tx switching is performed so that one Tx chain is located in each of a predetermined band determined according to [Method 3] above and band X where one-port UL transmission occurs.

[0153] ◆ In this case, if simultaneous UL transmission is not performed in a specified band determined according to [Method 3] and band X in which one-port UL transmission occurs, or if it is configured or reported that simultaneous UL transmission is not performed in the two bands, the terminal can perform UL Tx switching so that both Tx chains are located in band X.

[0154] ◆ Alternatively, if simultaneous UL transmission is not performed in a specific band determined according to [Method 3] above and band X in which one-port UL transmission has occurred, or if simultaneous UL transmission is configured or reported not to occur in the two bands, the terminal can perform UL Tx switching so that one Tx chain is located in one of the bands capable of simultaneous transmission with band X and one Tx chain is located in band X, according to the RRC configuration proposed in Opt-3 below or the RRC configuration proposed in Opt-3 of Method 4 in [3-2] described below.

[0155] ◆ Alternatively, in this case the terminal may not expect to have a 1-port UL transmission scheduled in band X.

[0156] ◆ In this case, the predetermined band determined according to [Method 3] above or the RRC configuration proposed in Opt-3 below or the predetermined band set for each band by the RRC configuration proposed in Opt-3 of Method 4 in [3-2] described below is the same as band X where 1-port UL transmission occurs. In this case, even if only 1-port UL transmission is scheduled in band X, the terminal can perform UL Tx switching so that both Tx chains are located in band X.

[0157] □ Opt-3: When 'uplinkTxSwitching-DualUL-TxState' is set to 'twoT', UL Tx switching is performed according to [Method 1] above so that two Tx chains are located in band X where one-port UL transmission occurs. When set to 'oneT', UL Tx switching is performed so that Tx chains are located in one or two predetermined bands. In this case, the predetermined one or two bands can be set via another RRC (shown as 'UTS-TxState-Ext-1'). 'UTS-TxState-Ext-1' can set / indicate one band in which two Tx chains are located or one combination of two bands in which one Tx chain is located, which can be determined by [Method 1], [Method 2] and / or [Method 3] above.

[0158] □ In this case, the predetermined band for band X set / instructed via 'UTS-TxState-Ext-1' becomes band X, which is the band in which 1-port UL transmission occurs. That is, when 1-port UL transmission occurs in band X, if two Tx chains are both in band Y_0 (where Y_0 means a band different from X), the switching option is set to 'dualUL', and 'uplinkTxSwitching-DualUL-TxState' is set to 'oneT', one of the Tx chains in band Y_0 is switched to band X, and the other Tx chain is switched to the predetermined band set / instructed by 'UTS-TxState-Ext-1'. If the predetermined band for band X is set / instructed to band X by 'UTS-TxState-Ext-1', both of the UE's Tx chains are switched to band X, even though 'uplinkTxSwitching-DualUL-TxState' is set to 'oneT'.

[0159] Generalizing Opt-3, RRC determines whether UL Tx switching is performed so that a 2-Tx chain is located in band X where a 1-port UL transmission occurs, or whether UL Tx switching is performed so that a 1-Tx is located in band X where a 1-port UL transmission occurs and another 1-Tx is located in another specified band (in this case, which band is the specified band).

[0160] The RRC configuration in the method 3 or 4 can configure each of the predetermined bands for each band configured in the terminal (or for which UL Tx switching is configured).

[0161] For example, for three bands, one predetermined band for band A is set to band B, one predetermined band for band B to band C, and one predetermined band for band C to band A. In this case, when two Tx chains are present in band A and one-port UL transmission occurs in band B, one Tx chain can be switched to each of bands B and C. Alternatively, when one-port UL transmission occurs in band C, one Tx chain can be switched to band C, and the other one Tx chain can remain in band A.

[0162] In this case, the predetermined band set for each band can be set to one of the bands that is set or reported as being capable of simultaneous UL transmission with the band.

[0163] Alternatively, the predetermined band set for each band can be set to the same band as the band. In this case, if a UL transmission occurs in that band and a Tx chain needs to be switched to that band, the terminal can switch both Tx chains to that band even if the UL transmission scheduled for that band is a 1-port UL transmission. Alternatively, in this case, the terminal may not expect a 1-port UL transmission to be scheduled for that band.

[0164] If there is no other band that can transmit simultaneously with a certain band (=X1 band), the base station may not set the predetermined band for the X1 band. When UL transmission occurs in the X1 band and a Tx chain needs to be switched to the X1 band, the terminal may switch both Tx chains to the X1 band even if the UL transmission scheduled for the X1 band is a 1-port UL transmission. Alternatively, in this case, the terminal may not expect 1-port UL transmission to be scheduled for the X1 band.

[0165] The RRC configuration may be the same as the RRC configuration proposed in [3-2] (e.g., [3-2]-Method 3-Opt2) described later. Alternatively, the RRC configuration may be a configuration used for "a situation in which there are two Tx chains in one predetermined band (e.g., band A)" ​​and may not be applicable to "a situation in which there are one Tx chain in each of two predetermined bands (e.g., band A and band B)" proposed in [3-2].

[0166] [3-2] Processing method when there is one Tx chain in each of two given bands (e.g., band A and band B), and one-port UL transmission occurs only in another band (=Y) that is not band A or band B: At least one or a combination of two or more of the following methods can be applied.

[0167] - Method 1: The UE assumes that two Tx chains are located in the band (= Y) in the Tx chain state after UL Tx switching. That is, in the situation where the possible cases after UL Tx switching described in Sections [1] and [2] are not the only ones, the UE changes to a state where two Tx chains are connected to band Y.

[0168] - Method 2: In the state of the Tx chain after UL Tx switching, the UE assumes that one Tx chain is located in each of the band (= Y) and a predetermined band (i.e., A or B) among the bands to which the previous one Tx chain was connected. That is, in a situation where the possible cases after UL Tx switching described in Sections [1] and [2] are not the only ones, the UE changes to a state in which one Tx chain is connected to each of a predetermined band among the bands to which one Tx chain was connected before UL Tx switching and band Y where one-port UL transmission occurred. In this case, the predetermined band among bands A and B can be configured via another RRC or determined according to a predefined rule.

[0169] □ Examples of predefined rules:

[0170] ◆ Band A or B is determined to be the band that contains the cell / carrier with the lowest or highest index among the cell / carrier indexes belonging to each band, or the band on the lowest or highest frequency.

[0171] ◆ Of bands A and B, the band with the closest frequency interval to band Y is selected.

[0172] ◆ Of bands A and B, the band with the most recent UL transmission prior to the one-port UL transmission of band Y is determined.

[0173] ◆ Of bands A and B, the band for configured UL transmission set via higher layer signaling such as RRC is determined.

[0174] - Method 3: The UE assumes that after UL Tx switching, one Tx is located in the band (=X) and one predetermined band in the Tx chain state. That is, in the situation where the possible cases after UL Tx switching described in Sections [1] and [2] are not the only ones, the UE changes to a state where one Tx chain is connected to band Y where one-port UL transmission occurs and one predetermined band.

[0175] At this time, the predetermined band is determined as follows.

[0176] ◆ Opt1: Predefined: Determined as the band containing the lowest or highest cell / carrier index among the bands excluding band Y. Alternatively, the predetermined band is determined as the band on the lowest or highest frequency among the bands excluding band Y.

[0177] ◆ Opt2: The predetermined band is configured via another RRC.

[0178] ◆ Opt3: If one-port UL transmission in band Y is scheduled via DCI, the predetermined one band is configured / indicated via that DCI.

[0179] - Method 4: (Re)using the conventional 3GPP Rel-17 RRC parameter "uplinkTxSwitching-DualUL-TxState"

[0180] □ Opt-1: When "uplinkTxSwitching-DualUL-TxState" is set to "twoT", UL Tx switching is performed according to [Method 1] above so that two Tx chains are located in band Y where one-port UL transmission occurs.When set to "oneT", UL Tx switching is performed so that one Tx chain is located in each of the one band determined according to [Method 2] above and band Y where one-port UL transmission occurs.

[0181] □ Opt-2: When "uplinkTxSwitching-DualUL-TxState" is set to "twoT", UL Tx switching is performed according to [Method 1] above so that two Tx chains are located in band Y where one-port UL transmission occurs.When set to "oneT", UL Tx switching is performed so that one Tx chain is located in each of a predetermined band determined according to [Method 3] above and band Y where one-port UL transmission occurs.

[0182] □ Opt-3: When "uplinkTxSwitching-DualUL-TxState" is set to "twoT", UL Tx switching is performed according to [Method 1] above so that two Tx chains are located in band Y where one-port UL transmission occurs. When set to "oneT", UL Tx switching is performed so that Tx chains are located in one or two predetermined bands. In this case, the predetermined one or two bands are set via another RRC (called "TS-TxState-Ext-2"). "UTS-TxState-Ext-2" sets / indicates one band in which two Tx chains are located or one combination of two bands in which one Tx chain is located, which can be determined by [Method 1], [Method 2] and / or [Method 3] above.

[0183] □ In this case, the predetermined band for band X set / instructed via the 'UTS-TxState-Ext-1' becomes band X, which is the band in which 1-port UL transmission occurs. That is, when 1-port UL transmission occurs in band X, if two Tx chains are in band Y_1 and band Y_2 (where Y_1 and Y_2 mean bands different from band X), the switching option is set to 'dualUL', and 'uplinkTxSwitching-DualUL-TxState' is set to 'oneT', one of the Tx chains in band Y_1 or Y_2 is switched to band X, and the other Tx chain in band Y_2 or Y_1 can be switched to the predetermined band set / instructed via 'UTS-TxState-Ext-1'. When the specified band for band X is set / instructed to band X via 'UTS-TxState-Ext-1', both Tx chains of the terminal are switched to band X even though 'uplinkTxSwitching-DualUL-TxState' is set to 'oneT'.

[0184] Generalizing Opt-3, RRC can set whether UL Tx switching is performed so that two Tx chains are located in band Y where one-port UL transmission occurs, or whether UL Tx switching is performed so that one Tx chain is located in band X where one-port UL transmission occurs and one Tx chain is located in another specified band (in this case, which band is the specified band).

[0185] The RRC configuration in the method 3 or 4 can configure each of the predetermined bands for each band configured in the terminal (or for which UL Tx switching is configured).

[0186] For example, for four bands, one predetermined band for band A can be set to band B, one predetermined band for band B to band C, one predetermined band for band C to band D, and one predetermined band for band D to band A. In this case, when one Tx chain exists in each of bands A and B, if one-port UL transmission occurs in band C, one Tx chain can be switched to each of bands C and D. Alternatively, if one-port UL transmission occurs in band D, one Tx chain can be switched to band D, and the other one Tx chain can remain in band A.

[0187] In this case, the predetermined band set for each band can be set to one of the bands that is set or reported as being capable of simultaneous UL transmission with the band.

[0188] Alternatively, the predetermined band set for each band can be set to the same band as each band. In this case, if an UL transmission occurs in that band and a Tx chain needs to be switched to that band, the terminal can switch both Tx chains to that band even if the UL transmission scheduled for that band is a 1-port UL transmission. Alternatively, in this case, the terminal may not expect a 1-port UL transmission to be scheduled for that band.

[0189] If there is no other band that can transmit simultaneously with a certain band (=X1 band), the base station may not set the predetermined band for the X1 band. When UL transmission occurs in the X1 band and a Tx chain needs to be switched to the X1 band, the terminal may switch both Tx chains to the X1 band even if the UL transmission scheduled for the X1 band is a 1-port UL transmission. Alternatively, in this case, the terminal may not expect 1-port UL transmission to be scheduled for the X1 band.

[0190] The RRC configuration may be the same as the RRC configuration proposed in [3-1] (e.g., [3-1]-Method 3-Opt2), or may be a configuration used for "a situation in which there is one Tx chain in each of two predetermined bands (e.g., band A and band B)" and may not be applicable to "a situation in which there are two Tx chains in one predetermined band (e.g., band A)" ​​proposed in [3-1].

[0191] [3-3] By combining one or more of the methods proposed in [3-1] and one or more of the methods proposed in [3-2], UL Tx switching operations in three or four bands can be configured.

[0192] For example, when a one-port UL transmission occurs in band Z, not band A, if the Tx chain state before UL Tx switching is that there are two Tx chains in band A, UL Tx switching can be performed according to [3-1] - [Method 2] above so that one Tx chain is located in each of band A and band Z. If the Tx chain state before UL Tx switching is that there is one Tx chain in each of band A and band B, UL Tx switching can be performed according to [3-2] - [Method 1] above so that two Tx chains are located in band Z.

[0193] As another example, when one-port UL transmission occurs in band Z, not band A, if the state of the Tx chain before UL Tx switching is such that there are two Tx chains in band A, UL Tx switching can be performed according to [3-1] - [Method 2] above so that a Tx chain is located in each of band A and band Z. If the state of the Tx chain before UL Tx switching is such that there is one Tx chain in each of band A and band B, UL Tx switching can be performed according to [3-2] - [Method 3] - [Opt2] above so that one Tx chain is located in each of the one band determined and band Z.

[0194] As another example, when one-port UL transmission occurs in band Z, not band A, and 'uplinkTxSwitching-DualUL-TxState' is set to 'twoT', UL Tx switching can be performed so that two Tx chains are located in band Z. If the RRC is set to 'oneT', UL Tx switching can be performed so that one Tx chain is located in band Z and another Tx chain is located in one predetermined band determined by either method [3-1] or method [3-2] above.

[0195] [3-4] The proposed methods of [3-1] to [3-3] above may be applied to only one of the "simultaneous transmission options" (i.e., "switchedUL" or "dualUL") configured for UL Tx switching. For example, the proposed methods described above are applied only to the band combinations configured with dualUL for a UE configured with UL Tx switching.

[0196] [3-5] In Rel-17, the RRC parameter uplinkTxSwitching-DualUL-TxState can be set to either "oneT" or "twoT" by CellGroupConfig. The RRC parameter uplinkTxSwitching-DualUL-TxState can also be applied to bands where dualUL is configured. In this case, dualUL configuration is also performed by CellGroupConfig. If "oneT" is configured for a band where dualUL is configured, one-port UL transmission is scheduled for a specific band, and if UL Tx switching occurs as a result, one Tx chain is located in each of the two bands after switching. If "twoT" is configured, UL Tx switching is performed so that two Tx chains are located in the band where one-port UL is scheduled. On the other hand, Rel-17 defines UL Tx switching between two bands, so even if dualUL is configured by CellGroupConfig and uplinkTxSwitching-DualUL-TxState is configured, this can have the same effect as band pair (i.e., two band units) configuration.

[0197] In Rel-18, UL Tx switching is performed so that the Tx chain is located in one or two of the maximum four bands. Therefore, the number of UL Tx switching cases may differ depending on whether the dualUL configuration is performed by CellGroupConfig or on a band pair basis. Also, in Rel-17, simultaneous UL transmission was always possible in two bands configured with dualUL, but in Rel-18, it is not specified whether simultaneous UL transmission is always possible in two bands configured with dualUL. Therefore, taking into account the cases where the dualUL configuration and the simultaneous transmission enable / disable setting differ, it can be determined whether uplinkTxSwitching-DualUL-TxState is configured on a CellGroupConfig basis, on a band pair basis, or on a band basis.

[0198] (1) If dualUL configuration is performed by CellGroupConfig and simultaneous transmission is always possible in any band pair among the bands (e.g., band combinations) for which dualUL is configured, uplinkTxSwitching-DualUL-TxState can be configured by CellGroupConfig. That is, similar to Rel-17, dualUL configuration, simultaneous transmission enable / disable configuration, and oneT / twoT configuration for Rel-18 UL Tx switching can all be configured by CellGroupConfig.

[0199] (2) When dualUL configuration is performed by CellGroupConfig and simultaneous transmission is enabled or disabled for any pair of bands among the dualUL configured bands (e.g., band combinations) via another RRC, Alt-1 or Alt-2 is possible.

[0200] - Alt-1: uplinkTxSwitching-DualUL-TxState can be configured by CellGroupConfig.

[0201] - Alt-2: uplinkTxSwitching-DualUL-TxState can be configured per band pair.

[0202] When Alt-1 is applied, a specific band pair can be configured so that simultaneous transmission is not possible even if dualUL and oneT are configured (for the band combination including that band). In this case, the RRC configuration methods described in [3-1] to [3-5] above can be applied specifically. For example, UL Tx switching is configured for three bands A / B / C, dualUL and oneT are configured for bands A / B / C, and simultaneous transmission in band A and band B may or may not be permitted.

[0203] - When permitted

[0204] □ When there are two Tx chains in band A and one port UL transmission is scheduled in band B, since "oneT" is configured, after UL Tx switching, the state can be changed so that one Tx chain is located in each of band A and band B.

[0205] - When it is not acceptable

[0206] In a situation where there are two Tx chains in band A, if one-port UL transmission is scheduled in band B, there is no state where one Tx chain is located in each of bands A and B. Therefore, even if "oneT" is configured, the state cannot be changed so that a Tx chain is located in each of bands A and B. Therefore, in this case, the terminal

[0207] ◆ Opt 1) In the situation where "oneT" is set, as an exception, it operates so that both Tx chains are located only in band B, or

[0208] ◆ Opt 2) (As in the proposed method described above) preset one predetermined band for band B (preferably capable of simultaneous transmission with band B), and operate so that one Tx chain is located in each of the preset one predetermined band and band B (when a situation arises in which one port transmission from two Txs on band A, which cannot be simultaneously transmitted as described above, to band B is required), or

[0209] ◆ Opt 3) In a situation where there are two Tx chains in band A, it is not expected that one-port UL transmission will be scheduled in band B, which cannot transmit simultaneously with band A (if such a scheduling DCI is received, the terminal can operate to ignore (discard) the DCI).

[0210] (3) If dualUL configuration is performed per band pair and simultaneous transmission is always possible in the dualUL configured band pair, uplinkTxSwitching-DualUL-TxState can be configured per band pair. That is, for Rel-18 UL Tx switching, dualUL configuration, simultaneous transmission enable / disable setting, and oneT / twoT setting can all be configured per band pair.

[0211] However, the present invention is not limited to application to 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 concept of a base station in the present invention includes not only a base station but also a relay node. For example, the operation of a base station in the present invention may be performed by a base station, or may be performed by a relay node.

[0212] The above-mentioned example of the proposed method is also included as one of the implementation methods of this specification and is therefore recognized as a type of proposed method. The above-mentioned proposed methods may be implemented independently, or may be implemented in the form of a combination (or merging) of some of the proposed methods. Information regarding whether the above-mentioned proposed method is applied (or information regarding the rules of the proposed method) can be notified by the base station to the terminal, or by the transmitting terminal to the receiving terminal via a predetermined signal (e.g., a physical layer signal or an upper layer signal).

[0213] Example

[0214] FIG. 5 is a flowchart illustrating a signal transmission and reception method according to an embodiment of the present invention.

[0215] 5, a signal transmission / reception method according to an embodiment of the present invention is performed by a terminal and may include the steps of: setting at least three uplink bands (S501), receiving first and second parameters (S503), and performing a second transmission in an operating state in which the first transmission can be supported (S505). A signal transmission / reception method by a base station corresponding to the embodiment of the present invention shown in FIG. 5 may include the steps of setting at least three uplink bands to a terminal (S501), transmitting first and second parameters (S503), and receiving a second transmission from the terminal in an operating state in which the first transmission can be supported (S505).

[0216] The at least three uplink bands include at least a first band, a second band, and a third band, and may further include uplink bands from a fourth band to an Nth band depending on the number of uplink bands.

[0217] The first transmission is a transmission before uplink switching, and the second transmission is a transmission after uplink switching. Since one or more bands in which the first transmission is performed and the second transmission are performed are different, uplink switching (UL Tx switching) is required to switch one or more of the two Tx chains in the terminal to another band. For reference, in the embodiments of the present invention, it is not necessary for the first transmission to be performed between the terminal and the base station. For whatever reason, as long as the position of the Tx chain of the terminal is in an operating state in which the first transmission can be supported, each embodiment of the present invention can be implemented even if the first transmission is not actually performed. The same applies to the third transmission described below.

[0218] The first parameter refers to an RRC parameter, uplinkTxSwitching-DualUL-TxState. Referring to the conventional 3GPP TS 38.331 standard, this parameter is a parameter for indicating the state of the Tx chain at all times after uplink switching when the state of the Tx chain after uplink switching is not unique. If the value of this parameter indicates one Tx chain (i.e., if the value of this parameter is oneT), the base station and / or terminal can assume that two Tx chains after uplink switching are connected / located, one on each carrier in each band. If this parameter is not set or indicates two Tx chains (i.e., if the value of this parameter is twoT), the base station and / or terminal can assume that two Tx chains after uplink switching are all connected / located on carriers in one band.

[0219] (uplinkTxSwitching-DualUL-TxState indicates the state of Tx chains if the state of Tx chains after the UL Tx switching is not unique in case of 2Tx-2Tx switching is configured and uplinkTxSwitchingOption is set to dualUL. Value oneT indicates 1Tx is assumed to be supported on the carriers on each band, value twoT indicates 2Tx is assumed to be supported on that carrier.)

[0220] The second parameter is a parameter for setting an associated band for a band in which one-port transmission is performed after uplink switching, and is an RRC parameter named "AssociatedBand."

[0221] In addition to the operations of FIG. 5, one or more of the operations described in sections [0] to [3] may be performed.

[0222] For example, referring to [3-2] of the present invention, in a situation where there is one Tx chain in each of two given bands, one-port UL transmission occurs in the other band. Thus, according to the example of [3-2], the first transmission corresponds to one-port transmission on each carrier in the first band (or band A) and the second band (or band B). The second transmission corresponds to one-port transmission on a carrier in the third band (or band Y).

[0223] Furthermore, referring to Opt-2 of Method 4 in [3-2], if the first parameter indicates oneT, i.e., one Tx chain, after uplink switching, one Tx chain will be located in each of the predetermined band determined according to Method 3 and Band 3 where one-port UL transmission occurs. Referring to Opt-2 of Method 3 in Section [3-2], the predetermined band is configured via RRC signaling. The predetermined band corresponds to the associated band, and the RRC signaling for configuring the predetermined band can include the second parameter. The associated band is the first band or the second band. Alternatively, the associated band may be a band other than the first to third bands.

[0224] Therefore, the Tx chains that were located one each in the first band and the second band before the uplink switching will be located one each in the third band and the associated band after the uplink switching.

[0225] In other words, in an operating state in which the terminal can support one-port transmission (first transmission) on each carrier of the first band and the second band, if one-port transmission (second transmission) is performed on a carrier of the third band without transmission in the first band and the second band (or without transmission in all bands except the third band), and if the value of the first parameter indicates one Tx chain and the associated band is set by the second parameter, then for uplink switching the terminal considers that one-port transmission has been performed on each carrier of the third band and the associated band.

[0226] (If the UE is configured with uplinkTxSwitching-DualUL-TxState set to 'oneT', when the UE is under the operation state in which 1-port transmission can be supported on one carrier on the 1st band and the 2nd band followed by no transmission on any carrier on these two bands and 1-port transmission on the other carrier on the 3rd band the UE shall consider this as if 1-port transmission was transmitted on the 3rd band and the band associated with the 3rd band as configured by AssociatedBand, otherwise the UE shall consider this as if 2-port transmission took place on the transmitting carrier).

[0227] The terminal actually sees one-port transmission on each carrier of the third band and the associated band for uplink switching only, not the second transmission, so only the Tx chain is switched in the associated band and no uplink transmission actually occurs on a carrier of the associated band.

[0228] Therefore, by configuring the terminal to consider that one-port transmission has occurred on the carrier of the relevant band, the terminal and base station can clearly determine the location of Tx chains that are not actually used for transmission.

[0229] As described above, the associated band of the third band is set by the second parameter. However, since uplink switching must be performed smoothly even when one-port transmission is first performed on each carrier of the first band (or the second band) and the third band, and one-port transmission is then performed in the second band (or the first band), the second parameter can be used to set the associated band for each band for all bands configured in the terminal in relation to uplink switching.

[0230] If the first parameter is not set or indicates twoT, i.e., two Tx chains, both of the two Tx chains located in the first band and the second band are switched to the third band, which is the same as the terminal regarding uplink switching as two-port transmission on a carrier in the third band.

[0231] Furthermore, referring to Section [3-1] of the present invention, in a situation where there are two Tx chains in a given band, one-port UL transmission occurs in another band. Thus, according to the example in Section [3-1], the first transmission corresponds to a two-port transmission performed on a carrier wave in the first band (or Band A). The second transmission corresponds to a one-port transmission performed on a carrier wave in the third band (or Band X). When the operations in Sections [3-1] and [3-2] are combined, the transmissions corresponding to either one can be referred to as the first transmission and the second transmission, and the transmissions corresponding to the other one can be referred to as the third transmission and the fourth transmission.

[0232] With reference to Opt-2 of Method 4 in [3-1], if the first parameter indicates oneT, i.e., one Tx chain, after uplink switching, one Tx chain will be located in each of the predetermined band determined according to Method 3 and Band 3 where one-port UL transmission occurs. With reference to Opt-2 of Method 3 in [3-1], the predetermined band is configured via RRC signaling. The predetermined band corresponds to the associated band, and the RRC signaling for configuring the predetermined band can include the second parameter. The associated band can be the first band or the second band. Alternatively, the associated band can be a band other than the first to third bands.

[0233] In other words, in an operating state in which the terminal is capable of supporting two-port transmission (first transmission or third transmission) on a carrier wave of a first band, in the case where one-port transmission (second transmission or fourth transmission) is performed on a carrier wave of a third band without transmission in the first band (or without transmission in all bands except the third band), if the value of the first parameter indicates one Tx chain and the associated band is set by the second parameter, then for uplink switching the terminal considers that one-port transmission has been performed on each carrier wave of the third band and the associated bands.

[0234] (If the UE is configured with uplinkTxSwitching-DualUL-TxState set to 'oneT', when the UE is under the operation state in which 2-port transmission can be supported on one carrier on one band followed by no transmission on any carrier on the same band and 1-port transmission on the other carrier on another band the UE shall consider this as if 1-port transmission was transmitted on both uplinks, otherwise the UE shall consider this as if 2-port transmission took place on the transmitting carrier.)

[0235] Since the terminal actually perceives that one-port transmission has occurred on each carrier of the third band and the associated band for uplink switching only, and not the second transmission (or fourth transmission), only the Tx chain is switched to the associated band, and no uplink transmission actually occurs on the carrier of the associated band.

[0236] In addition to the operations described in relation to Figure 5, any one or more of the operations described with reference to Figures 1 to 4 and / or the operations described in [1] to [3] may be further performed in combination.

[0237] An example of a communication system to which the present invention is applied

[0238] Without being limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or flow charts of the present invention disclosed in this specification may be applied to various fields requiring wireless communication / connectivity between devices (e.g., 5G).

[0239] Hereinafter, a more detailed description will be given with reference to the drawings. In the following drawings / description, the same reference numerals indicate the same or corresponding hardware blocks, software blocks or function blocks unless otherwise specified.

[0240] FIG. 6 illustrates a communication system 1 to which the present invention is applied.

[0241] Referring to FIG. 6, a communication system 1 applicable to the present invention includes wireless devices, base stations, and a network. Here, the wireless devices refer to devices that communicate using wireless connection technologies (e.g., 5G NR, LTE), and are also referred to as communication / wireless / 5G devices. The wireless devices include, but are not limited to, a robot 100a, vehicles 100b-1 and 100b-2, an XR (eXtended Reality) device 100c, a handheld device 100d, a home appliance 100e, an IoT (Internet of Things) device 100f, and an AI server / device 400. For example, the vehicles include vehicles equipped with wireless communication capabilities, autonomous vehicles, vehicles capable of vehicle-to-vehicle communication, etc. Here, the vehicles include unmanned aerial vehicles (UAVs) (e.g., drones). XR devices include Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR) devices, and are embodied in the form of Head-Mounted Devices (HMDs), Head-Up Displays (HUDs) mounted on vehicles, TVs, smartphones, computers, wearable devices, home appliances, digital billboards, vehicles, robots, etc. Mobile devices include smartphones, smart pads, wearable devices (e.g., smart watches, smart glasses), computers (e.g., laptops, etc.), etc. Home appliances include TVs, refrigerators, washing machines, etc. IoT devices include sensors, smart meters, etc. For example, base stations and networks may also be embodied as wireless devices, and a specific wireless device 200a may operate as a base station / network node for other wireless devices.

[0242] The wireless devices 100a to 100f are connected to a network 300 via a base station 200. The wireless devices 100a to 100f are equipped with AI (Artificial Intelligence) technology, and are connected to an AI server 400 via the network 300. The network 300 is configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices 100a to 100f can communicate with each other via the base station 200 / network 300, but can also communicate directly without going through the base station / network (e.g., sidelink communication). For example, vehicles 100b-1 and 100b-2 can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to Everything) communication). IoT devices (e.g., sensors) can also communicate directly with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0243] Wireless communication / connections 150a, 150b, and 150c are performed between the wireless devices 100a to 100f and the base stations 200, and between the base stations 200. Here, the wireless communication / connections are performed using various wireless connection technologies such as uplink / downlink communication 150a and sidelink communication 150b (or D2D communication), and communication between base stations 150c (e.g., relay, Integrated Access Backhaul (IAB)) (e.g., 5G NR). Through the wireless communication / connections 150a, 150b, and 150c, the wireless devices and the base stations, and the base stations, can transmit / receive wireless signals to / from each other. For example, the wireless communication / connections 150a, 150b, and 150c can transmit / receive signals via various physical channels. To this end, according to various proposals of the present invention, any one of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes is performed.

[0244] Examples of wireless devices to which the present invention is applied

[0245] FIG. 7 illustrates a wireless device to which the present invention can be applied.

[0246] 7, a first wireless device 100 and a second wireless device 200 transmit and receive wireless signals using various wireless access technologies (e.g., LTE, NR). Here, {first wireless device 100, second wireless device 200} corresponds to {wireless devices 100a-100f, base station 200} and / or {wireless devices 100a-100f, wireless devices 100a-100f} in FIG. 6.

[0247] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and further includes one or more transceivers 106 and / or one or more antennas 108. The processor 102 is configured to control the memory 104 and / or the transceiver 106 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 102 processes information in the memory 104 to generate first information / signals and then transmits a wireless signal including the first information / signals via the transceiver 106. The processor 102 also receives a wireless signal including second information / signals via the transceiver 106 and then stores information obtained from signal processing of the second information / signals in the memory 104. The memory 104 is coupled to the processor 102 and stores various information related to the operation of the processor 102. For example, the memory 104 stores software code including instructions for performing some or all of the processes controlled by the processor 102 or for implementing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 102 and memory 104 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 106 is coupled to the processor 102 and transmits and / or receives wireless signals via one or more antennas 108. The transceiver 106 includes a transmitter and / or a receiver. The transceiver 106 may also be referred to as an RF (radio frequency) unit. In the present invention, a wireless device may also refer to a communication modem / circuit / chip.

[0248] The second wireless device 200 includes one or more processors 202 and one or more memories 204, and further includes one or more transceivers 206 and / or one or more antennas 208. The processor 202 is configured to control the memory 204 and / or the transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 202 processes information in the memory 204 to generate third information / signal, and then transmits a wireless signal including the third information / signal via the transceiver 206. The processor 202 also receives a wireless signal including a fourth information / signal via the transceiver 206, and then stores information obtained from signal processing of the fourth information / signal in the memory 204. The memory 204 is coupled to the processor 202 and stores various information related to the operation of the processor 202. For example, the memory 204 stores software code including instructions for performing some or all of the processes controlled by the processor 202 or for implementing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 202 and memory 204 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 206 is coupled to the processor 202 and transmits and / or receives wireless signals via one or more antennas 208. The transceiver 206 includes a transmitter and / or a receiver. The transceiver 206 may also be referred to as an RF unit. In the present invention, a wireless device may also refer to a communication modem / circuit / chip.

[0249] The hardware elements of the wireless devices 100, 200 are described in more detail below. Without limitation, 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, and SDAP). The 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, suggestions, methods, and / or flowcharts disclosed herein. The one or more processors 102, 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. The one or more processors 102, 202 generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, suggestions, and / or methods disclosed herein and provide them to the one or more transceivers 106, 206. The one or more processors 102, 202 receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and derive the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein.

[0250] The one or more processors 102, 202 may also be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 may be implemented using hardware, firmware, software, or a combination thereof. For example, the one or more processors 102, 202 may include 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). The descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be implemented using firmware or software, and the firmware or software may be embodied to include modules, procedures, functions, etc. Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be included in the one or more processors 102, 202 or may be stored in one or more memories 104, 204 and executed by the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods and / or flow charts disclosed in this specification may be embodied using firmware or software in the form of code, instructions and / or sets of instructions.

[0251] One or more memories 104, 204 may be coupled to one or more processors 102, 202 and may store various types of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104, 204 may be comprised of 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 internal and / or external 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 techniques, such as wired or wireless connections.

[0252] One or more transceivers 106, 206 can transmit user data, control information, wireless signals / channels, etc., as referenced in the methods and / or flowcharts herein to one or more other devices. One or more transceivers 106, 206 can receive user data, control information, wireless signals / channels, etc., as referenced in the descriptions, functions, procedures, suggestions, methods and / or flowcharts herein from one or more other devices. For example, one or more transceivers 106, 206 can be coupled 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. Also, one or more processors 102, 202 can control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. Furthermore, one or more transceivers 106, 206 are coupled to one or more antennas 108, 208, and are configured to transmit and receive user data, control information, radio signals / channels, etc., as referred to in the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein via the one or more antennas 108, 208. In this specification, one or more antennas may refer to multiple physical antennas or multiple logical antennas (e.g., antenna ports). The one or more transceivers 106, 206 convert the received user data, control information, radio signals / channels, etc., from RF band signals to baseband signals for processing by one or more processors 102, 202. The one or more transceivers 106, 206 convert the user data, control information, radio signals / channels, etc., processed by one or more processors 102, 202, from baseband signals to RF band signals. For this purpose, the one or more transceivers 106, 206 include (analog) oscillators and / or filters.

[0253] Examples of use of wireless devices to which this invention is applied

[0254] 8 shows another example of a wireless device to which the present invention is applied. The wireless device may be implemented in various forms depending on the use case / service (see FIG. 6).

[0255] 8, wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 7 and are composed of various elements, components, units / sections, and / or modules. For example, the wireless devices 100 and 200 include a communication unit 110, a control unit 120, a memory unit 130, and an additional element 140. The communication unit includes a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 includes one or more processors 102 and 202 and / or one or more memories 104 and 204 in FIG. 7. For example, the transceiver 114 includes one or more transceivers 106 and 206 and / or one or more antennas 108 and 208 in FIG. 7. The control unit 120 is electrically coupled to the communication unit 110, the memory unit 130, and the additional element 140 and controls the overall operation of the wireless device. For example, the control unit 120 controls the electrical / mechanical operations of the wireless device based on the programs / codes / instructions / information stored in the memory unit 130. The control unit 120 also transmits the information stored in the memory unit 130 to an external device (e.g., another communication device) via the communication unit 110 via a wireless / wired interface, or stores information received from an external device (e.g., another communication device) via the communication unit 110 via a wireless / wired interface in the memory unit 130.

[0256] The additional element 140 may be configured in various ways depending on the type of wireless device. For example, the additional element 140 may include any one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computer unit. Wireless devices may be embodied in the form of, but not limited to, a robot (FIG. 6, 100a), a vehicle (FIG. 6, 100b-1, 100b-2), an XR device (FIG. 6, 100c), a mobile 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 financial device), a security device, a climate / environment device, an AI server / device (FIG. 6, 400), a base station (FIG. 6, 200), a network node, etc. Wireless devices may be mobile or fixed depending on the use case / service.

[0257] In FIG. 8, the various elements, components, units / sections and / or modules within the wireless devices 100, 200 are all connected to each other by wired interfaces, or at least some are connected wirelessly by a communication section 110. For example, in the wireless devices 100 and 200, the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and the first unit (e.g., 130, 140) are connected wirelessly via the communication unit 110. Furthermore, each element, component, unit / part and / or module in the wireless devices 100 and 200 further includes one or more elements. For example, the control unit 120 is configured with a set of one or more processors. For example, the control unit 120 is configured with a set of a communication control processor, an application processor, an ECU (Electronic Control Unit), a graphics processor, a memory control processor, etc. As another example, the memory unit 130 is configured with a RAM (Random Access Memory), a DRAM (Dynamic RAM), a ROM (Read Only Memory), a flash memory, a volatile memory, a non-volatile memory and / or a combination thereof.

[0258] Examples of vehicles or autonomous vehicles to which the present invention is applied

[0259] 9 is a diagram illustrating an example of a vehicle or an autonomous vehicle to which the present invention is applied. The vehicle or the autonomous vehicle may be embodied as a mobile robot, a car, a train, an aerial vehicle (AV), a ship, etc.

[0260] 9, a vehicle or autonomous vehicle 100 includes 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 is configured as part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 in FIG. 8, respectively.

[0261] The communication unit 110 transmits and receives signals (e.g., data, control signals, etc.) to and from external devices such as other vehicles, base stations (e.g., base stations, roadside units, etc.), and servers. The control unit 120 controls elements of the vehicle or autonomous vehicle 100 to perform various operations. The control unit 120 includes an ECU (Electronic Control Unit). The driving unit 140a causes the vehicle or autonomous vehicle 100 to move on the ground. The driving unit 140a includes an engine, a motor, a powertrain, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and includes wired / wireless charging circuits, a battery, etc. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c includes an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection 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, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit 140d implements technology for maintaining a lane while driving, technology for automatically adjusting speed such as adaptive cruise control, technology for automatically driving along a predetermined route, technology for automatically setting a route and driving when a destination is set, etc.

[0262] For example, the communication unit 110 receives map data, traffic information data, etc. from an external server. The autonomous driving unit 140d generates an autonomous driving route and a driving plan based on the obtained data. The control unit 120 controls the driving unit 140a (e.g., adjusting speed / direction) so that the vehicle or autonomous vehicle 100 moves along the autonomous driving route according to the driving plan. The communication unit 110 aperiodically obtains the latest traffic information data from an external server during autonomous driving and also obtains surrounding traffic information data from surrounding vehicles. In addition, the sensor unit 140c obtains vehicle status and surrounding environment information during autonomous driving. The autonomous driving unit 140d updates the autonomous driving route and driving plan based on the newly obtained data / information. The communication unit 110 transmits information regarding the vehicle position, autonomous driving route, driving plan, etc. to an external server. The external server can predict traffic information data using AI technology based on information collected from the vehicle or autonomous vehicle and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0263] It is obvious to those skilled in the art that the present invention can be embodied in other specific forms without departing from the characteristics of the present invention. Therefore, the above detailed description should not be construed as limiting in all respects, but should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention. [Industrial Applicability]

[0264] As mentioned above, the present invention can be applied to a variety of wireless communication systems.

Claims

1. A method for a terminal to transmit and receive signals in a wireless communication system, comprising: setting an uplink band including a first band, a second band, and a third band; (i) receiving a first parameter for indicating a state of a Tx chain if the state of the Tx chain is not unique after uplink switching, and (ii) a second parameter for setting an associated band for the third band; performing a one-port transmission (second transmission) on a carrier wave of the third band without transmission in the first band and the second band in an operating state in which one-port transmission (first transmission) can be supported on each carrier wave of the first band and the second band; the uplink switching is performed based on the second transmission; and Based on the value of the first parameter indicating one Tx chain and the associated band being set by the second parameter, the terminal considers that one-port transmission has been performed on each carrier of the third band and the associated band for the uplink switching. Signal transmission and reception method.

2. Based on the terminal regarding one-port transmission as having been performed on each carrier of the third band and the associated band, one Tx chain each located in the first band and the second band is switched to be located in the third band and the associated band, respectively. The signal transmitting and receiving method according to claim 1 .

3. a switching option between the third band and the associated band is configured to allow simultaneous transmission between the third band and the associated band; The signal transmitting and receiving method according to claim 1 .

4. When the value of the first parameter is not set or the value of the first parameter indicates two Tx chains, the terminal assumes that two-port transmission is performed on a carrier in the third band for the uplink switching. The signal transmitting and receiving method according to claim 1 .

5. and based on the terminal determining that two-port transmission has been performed on a carrier wave of the third band, the Tx chains located one each in the first band and the second band are switched to be located both in the third band.

5. The signal transmitting and receiving method according to claim 4.

6. the first parameter and the second parameter are received via RRC signaling; The signal transmitting and receiving method according to claim 1 .

7. the second parameters further include information on a second associated band related to the first band and a third associated band related to the second band; The signal transmitting and receiving method according to claim 1 .

8. performing a one-port transmission (fourth transmission) on the carrier wave of the third band without transmitting in the first band in an operating state in which two-port transmission (third transmission) on the carrier wave of the first band can be supported; a second uplink switching is performed based on the fourth transmission; Based on the value of the first parameter indicating one Tx chain and the associated band being set by the second parameter, the terminal considers that one-port transmission has been performed on each carrier of the third band and the associated band for the second uplink switching. The signal transmitting and receiving method according to claim 1 .

9. two Tx chains located in the first band are switched to be located one in each of the third band and the associated band, based on the terminal regarding one-port transmission being performed on each carrier of the third band and the associated band; The signal transmitting and receiving method according to claim 8.

10. A terminal for transmitting and receiving signals in a wireless communication system, comprising: at least one transceiver; at least one processor; at least one memory operatively connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform predetermined operations; The predetermined operation is setting an uplink band including a first band, a second band, and a third band; receiving (i) a first parameter for indicating a state of the Tx chain if the state of the Tx chain is not unique after uplink switching, and (ii) a second parameter for setting an associated band for the third band; performing a one-port transmission (second transmission) on a carrier wave of the third band without transmission in the first band and the second band in an operating state in which one-port transmission (first transmission) can be supported on each carrier wave of the first band and the second band; the uplink switching is performed based on the second transmission; and Based on the value of the first parameter indicating one Tx chain and the associated band being set by the second parameter, the terminal considers that one-port transmission has been performed on each carrier of the third band and the associated band for the uplink switching. Terminal.

11. Based on the terminal regarding one-port transmission as having been performed on each carrier of the third band and the associated band, one Tx chain each located in the first band and the second band is switched to be located in the third band and the associated band, respectively. The terminal according to claim 10.

12. a switching option between the third band and the associated band is configured to allow simultaneous transmission between the third band and the associated band; The terminal according to claim 10.

13. When the value of the first parameter is not set or the value of the first parameter indicates two Tx chains, the terminal assumes that two-port transmission is performed on a carrier in the third band for the uplink switching. The terminal according to claim 10.

14. and based on the terminal determining that two-port transmission has been performed on a carrier wave of the third band, the Tx chains located one each in the first band and the second band are switched to be located both in the third band. The terminal according to claim 13.

15. the first parameter and the second parameter are received via RRC signaling; The terminal according to claim 10.

16. the second parameters further include information on a second associated band for the first band and a third associated band for the second band; The terminal according to claim 10.

17. The predetermined operation is In an operating state in which two-port transmission (third transmission) can be supported on a carrier wave of the first band, performing one-port transmission (fourth transmission) on a carrier wave of the third band without transmitting on the first band, a second uplink switching is performed based on the fourth transmission; Based on the value of the first parameter indicating one Tx chain and the associated band being set by the second parameter, the terminal considers that one-port transmission has been performed on each carrier of the third band and the associated band for the second uplink switching. The terminal according to claim 10.

18. two Tx chains located in the first band are switched to be located one in each of the third band and the associated band, based on the terminal regarding one-port transmission being performed on each carrier of the third band and the associated band; 18. The terminal of claim 17.

19. 1. An apparatus for a terminal, comprising: at least one processor; and at least one computer memory operatively connected to the at least one processor that, when executed, causes the at least one processor to perform operations, the operations including: setting an uplink band including a first band, a second band, and a third band; receiving (i) a first parameter for indicating a state of the Tx chain if the state of the Tx chain is not unique after uplink switching, and (ii) a second parameter for setting an associated band for the third band; performing a one-port transmission (second transmission) on a carrier wave of the third band without transmission in the first band and the second band in an operating state in which one-port transmission (first transmission) can be supported on each carrier wave of the first band and the second band; the uplink switching is performed based on the second transmission; and Based on the value of the first parameter indicating one Tx chain and the associated band being set by the second parameter, the terminal considers that one-port transmission has been performed on each carrier of the third band and the associated band for the uplink switching. Device.

20. A computer-readable non-volatile storage medium containing at least one computer program that causes a terminal including at least one processor to perform operations, the operations including: setting an uplink band including a first band, a second band, and a third band; receiving (i) a first parameter for indicating a state of the Tx chain if the state of the Tx chain is not unique after uplink switching, and (ii) a second parameter for setting an associated band for the third band; performing a one-port transmission (second transmission) on a carrier wave of the third band without transmission in the first band and the second band in an operating state in which one-port transmission (first transmission) can be supported on each carrier wave of the first band and the second band; the uplink switching is performed based on the first transmission and the second transmission; Based on the value of the first parameter indicating one Tx chain and the associated band being set by the second parameter, the terminal considers that one-port transmission has been performed on each carrier of the third band and the associated band for the uplink switching. storage medium.

21. 1. A method for transmitting and receiving signals by a base station in a wireless communication system, comprising: setting an uplink band including a first band, a second band, and a third band in a terminal; transmitting to the terminal (i) a first parameter for indicating a state of the Tx chain if the state of the Tx chain is not unique after uplink switching, and (ii) a second parameter for setting an associated band for the third band; receiving a one-port transmission (second transmission) on a carrier wave of the third band without transmission in the first band and the second band from the terminal in an operational state capable of supporting one-port transmission (first transmission) on each carrier wave of the first band and the second band; the uplink switching is performed based on the second transmission; and Based on the value of the first parameter indicating one Tx chain and the associated band being set by the second parameter, the base station considers that one-port transmission has been performed on each carrier of the third band and the associated band for the uplink switching. Signal transmission and reception method.

22. In a wireless communication system, a base station for transmitting and receiving signals, comprising: at least one transceiver; at least one processor; at least one memory operatively connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform predetermined operations; The predetermined operation is setting an uplink band including a first band, a second band, and a third band in a terminal; transmitting to the terminal (i) a first parameter for indicating a state of the Tx chain if the state of the Tx chain is not unique after uplink switching, and (ii) a second parameter for setting an associated band for the third band; receiving a one-port transmission (second transmission) on a carrier wave of the third band without transmission in the first band and the second band from the terminal in an operational state capable of supporting one-port transmission (first transmission) on each carrier wave of the first band and the second band; the uplink switching is performed based on the second transmission; and Based on the value of the first parameter indicating one Tx chain and the associated band being set by the second parameter, the base station considers that one-port transmission has been performed on each carrier of the third band and the associated band for the uplink switching. Base station.

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