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

Abstract

According to one embodiment of the present specification, a method performed by a terminal comprises the steps of: receiving configuration information related to a sounding reference signal (SRS); and transmitting the SRS based on the at least one SRS resource. At least one SRS resource is associated with eight ports. The eight ports are divided and mapped to a plurality of symbols associated with the at least one SRS resource, and the number of one or more ports associated with each symbol in the plurality of symbols is the same.

Description

Technical Field

[0001] The present disclosure relates to a method and apparatus for transmitting and receiving a sounding reference signal in a wireless communication system. Background Art

[0002] Mobile communication systems have evolved to provide voice services while ensuring user activity. Mobile communication systems are expanding their services from voice only to data. The current surge in data traffic is exhausting resources, and user demands for higher data rate services bring about the need for more advanced mobile communication systems.

[0003] The next generation of mobile communication systems needs to meet the requirements of, for example, handling the explosive growth of data traffic, significantly improving the transmission rate per user, working with a large number of connected devices, and supporting very low end-to-end latency and high energy efficiency. To this end, various research efforts are being conducted on various technologies such as dual connectivity, massive multiple-input multiple-output (MIMO), in-band full-duplex, non-orthogonal multiple access (NOMA), ultra-wideband support, and device networking.

[0004] According to Rel-18 MIMO SRS enhancement, uplink 8Tx transmission is supported. A method for supporting 8-port SRS for uplink 8Tx transmission (eg, PUSCH transmission based on up to eight layers / eight antenna ports) is under discussion. Summary of the invention

[0005] Technical issues

[0006] When the above 8-port SRS is configured in one symbol, the power allocated to each port for SRS transmission may become too low. In other words, the 8-port SRS transmitted in one symbol may not be suitable for UL channel estimation for each port of the base station.

[0007] One aspect of the present disclosure is to propose a method for solving the above-mentioned problems.

[0008] The technical objectives to be achieved by the present disclosure are not limited to those that have been described above by way of example only, and those skilled in the art to which the present disclosure belongs can clearly understand other technical objectives not mentioned from the following description.

[0009] Technical Solution

[0010] According to one embodiment of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system includes the following steps: receiving configuration information related to a sounding reference signal (SRS); and sending the SRS based on at least one SRS resource. The configuration information includes information for the at least one SRS resource.

[0011] At least one SRS resource is associated with the eight ports.

[0012] The eight ports are divided and mapped to a plurality of symbols associated with at least one SRS resource, and the number of the one or more ports associated with each symbol in the plurality of symbols is the same.

[0013] In at least one SRS resource, i) a first parameter related to the frequency domain, ii) a second parameter related to the time domain, and iii) a third parameter related to the sequence may be configured.

[0014] The first parameter may include: i) transmissionComb related to a transmission comb value, ii) freqDomainPosition related to a frequency domain position, iii) freqDomainShift related to a frequency domain shift, and iv) freqHopping related to a frequency hopping.

[0015] The second parameter may include: i) startPosition related to a start symbol position, ii) nrofSymbols related to the number of symbols, and iii) repetitionFactor related to repetition of the SRS.

[0016] The third parameter may include: i) groupOrSequenceHopping related to group hopping and / or sequence hopping, and ii) sequenceId for sequence initialization.

[0017] At least one of the first parameters may be configured as a plurality of values ​​based on the number of the plurality of symbols.

[0018] At least one of the second parameters may be configured as a plurality of values ​​based on the number of the plurality of symbols.

[0019] Some of the plurality of parameters configured based on the number of the plurality of symbols may be set to the same value.

[0020] The plurality of parameters configured based on the number of the plurality of symbols may include: i) a parameter associated with a first symbol among the plurality of symbols, and ii) a parameter determined based on the parameter associated with the first symbol and an offset associated with the remaining symbols.

[0021] Indexes of one or more ports associated with each symbol may be configured in at least one SRS resource.

[0022] The at least one SRS resource may be based on an SRS resource set for antenna switching. The plurality of symbols may be consecutive symbols configured in the at least one SRS resource without configuring a guard period for antenna switching.

[0023] The at least one SRS resource may include a plurality of SRS resources, and the plurality of symbols may include one or more symbols configured based on the second parameter of each SRS resource.

[0024] The position of one or more symbols configured in one SRS resource among the plurality of SRS resources is different from the position of one or more symbols configured in another SRS resource among the plurality of SRS resources.

[0025] The position of one or more symbols configured in one SRS resource among the plurality of SRS resources is the same as the position of one or more symbols configured in another SRS resource among the plurality of SRS resources.

[0026] Based on the UE's capabilities related to simultaneous transmission across multiple panels (STxMP), a transmission configuration indicator (TCI) state and / or spatial relationship information may be configured in each SRS resource.

[0027] Based on the fact that the UE does not support STxMP, the TCI state and / or spatial relationship information configured in each SRS resource may be the same.

[0028] The plurality of symbols may be two symbols. Four ports among the eight ports may be mapped to a first symbol among the two symbols. The remaining four ports among the eight ports may be mapped to a second symbol among the two symbols.

[0029] According to another embodiment of the present disclosure, a user equipment (UE) operating in a wireless communication system includes: one or more transceivers; one or more processors; and one or more memories, wherein the one or more memories are operably connected to the one or more processors and store instructions, wherein the instructions are configured to cause the one or more processors to perform operations based on execution by the one or more processors.

[0030] The operations may include: receiving configuration information related to a sounding reference signal (SRS); and transmitting the SRS based on at least one SRS resource. The configuration information includes information for the at least one SRS resource.

[0031] At least one SRS resource is associated with the eight ports.

[0032] The eight ports are divided and mapped to a plurality of symbols associated with at least one SRS resource, and the number of the one or more ports associated with each symbol in the plurality of symbols is the same.

[0033] According to yet another embodiment of the present disclosure, a device includes one or more memories and one or more processors functionally connected to the one or more memories.

[0034] The one or more memories store instructions configured to cause the one or more processors to perform operations upon execution by the one or more processors.

[0035] The operations include: receiving configuration information related to a sounding reference signal (SRS); and transmitting the SRS based on at least one SRS resource. The configuration information includes information for the at least one SRS resource.

[0036] At least one SRS resource is associated with the eight ports.

[0037] The eight ports are divided and mapped to a plurality of symbols associated with at least one SRS resource, and the number of the one or more ports associated with each symbol in the plurality of symbols is the same.

[0038] According to another embodiment of the present disclosure, one or more non-transitory computer-readable media store one or more commands.

[0039] The one or more commands executable by the one or more processors are configured to cause the one or more processors to perform operations.

[0040] The operations include: receiving configuration information related to a sounding reference signal (SRS); and transmitting the SRS based on at least one SRS resource. The configuration information includes information for the at least one SRS resource.

[0041] At least one SRS resource is associated with the eight ports.

[0042] The eight ports are divided and mapped to a plurality of symbols associated with at least one SRS resource, and the number of the one or more ports associated with each symbol in the plurality of symbols is the same.

[0043] According to another embodiment of the present disclosure, a method performed by a base station in a wireless communication system includes: sending configuration information related to a sounding reference signal (SRS); and receiving an SRS based on at least one SRS resource. The configuration information includes information for the at least one SRS resource.

[0044] At least one SRS resource is associated with the eight ports.

[0045] The eight ports are divided and mapped to a plurality of symbols associated with at least one SRS resource, and the number of the one or more ports associated with each symbol in the plurality of symbols is the same.

[0046] According to another embodiment of the present disclosure, a base station operating in a wireless communication system includes: one or more transceivers; one or more processors; and one or more memories, wherein the one or more memories are operably connected to the one or more processors and store instructions, wherein the instructions are configured to cause the one or more processors to perform operations based on execution by the one or more processors.

[0047] The operations include: sending configuration information related to a sounding reference signal (SRS); and receiving the SRS based on at least one SRS resource.

[0048] At least one SRS resource is associated with the eight ports. The configuration information includes information for the at least one SRS resource.

[0049] The eight ports are divided and mapped to a plurality of symbols associated with at least one SRS resource, and the number of the one or more ports associated with each symbol in the plurality of symbols is the same.

[0050] Beneficial Effects

[0051] According to an embodiment of the present disclosure, eight ports are evenly distributed to a plurality of symbols to transmit SRS, so that a power boost effect can be achieved compared to configuring eight ports in one symbol.

[0052] In addition, compared with SRS transmission based on eight ports in one symbol, the accuracy of UL channel estimation of the base station can be improved. Therefore, the reliability of uplink channel transmission scheduled after SRS transmission can be improved. In other words, uplink channel transmission scheduling based on up to eight antenna ports can be performed (based on antenna ports) based on SRS resources that are more suitable for UL channels.

[0053] Effects that can be achieved with the present disclosure are not limited to the effects described above by way of example only, and other effects and advantages of the present disclosure will be more clearly understood by those skilled in the art to which the present disclosure pertains from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 is a flow chart illustrating an example of a UL BM procedure using SRS.

[0055] Figure 2 is a diagram illustrating flexible aperiodic SRS transmission timing control.

[0056] Figure 3 is a diagram illustrating partial-band SRS transmission.

[0057] Figure 4 is a flowchart for describing a method performed by a user equipment according to an embodiment of the present disclosure.

[0058] Figure 5 is a flowchart for describing a method performed by a BS according to another embodiment of the present disclosure.

[0059] Figure 6 is a diagram illustrating the configuration of a first device and a second device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0060] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The following detailed description in conjunction with the accompanying drawings is intended to describe embodiments of the present disclosure, but does not represent the only embodiment of the present disclosure. The following detailed description includes specific details to convey a thorough understanding of the present disclosure. However, it will be readily understood by those of ordinary skill in the art that embodiments of the present disclosure can be practiced even without these details.

[0061] In some cases, to avoid conceptual ambiguity, well-known structures or devices may be omitted, or shown in a block diagram form while focusing on the core features of each structure and device.

[0062] In the following, downlink (DL) means communication from a base station to a terminal, and uplink (UL) means communication from a terminal to a base station. In the downlink, the transmitter may be part of a base station, and the receiver may be part of a terminal. In the uplink, the transmitter may be part of a terminal, and the receiver may be part of a base station. The base station may be represented as a first communication device, and the terminal may be represented as a second communication device. The base station (BS) may be replaced with terms including a fixed station, a node B, an evolved node B (eNB), a next generation node B (gNB), a base station transceiver system (BTS), an access point (AP), a network (5G network), an AI system, a roadside unit (RSU), a vehicle, a robot, an unmanned aerial vehicle (UAV), an augmented reality (AR) device, a virtual reality (VR) device, and the like. In addition, the terminal may be fixed or mobile, and may be replaced by terms including user equipment (UE), mobile station (MS), user terminal (UT), mobile subscriber station (MSS), subscriber station (SS), advanced mobile station (AMS), wireless terminal (WT), machine type communication (MTC) device, machine-to-machine (M2M) device and device-to-device (D2D) device, vehicle, robot, AI module, unmanned aerial vehicle (UAV), augmented reality (AR) device, virtual reality (VR) device, etc.

[0063] SRS related operations

[0064] The UE may be configured (via high-level signaling, RRC signaling, etc.) with one or more sounding reference symbol (SRS) resource sets configured by (high-level parameter) SRS-ResourceSet. For each SRS resource set, the UE may be configured with K (≥1) SRS resources (high-level parameter SRS-resources). Here, K is a natural number, and the maximum value of K is indicated by SRS_capability.

[0065] Figure 1 is a flow chart illustrating an example of a UL BM procedure using SRS.

[0066] - The UE receives RRC signaling (eg, SRS-Config IE) including a usage parameter from the BS (S110). As an example, the usage parameter may be configured as "beam management", "codebook", "non-codebook" or "antenna switching".

[0067] Table 1 shows an example of an SRS-Config information element (IE), which is used for SRS transmission configuration. The SRS-Config IE includes a list of SRS resources and a list of SRS resource sets. Each SRS resource set means a collection of SRS resources.

[0068] The network can use the configured aperiodicSRS-ResourceTrigger (L1 DCI) to trigger the transmission of the SRS resource set.

[0069] [Table 1]

[0070]

[0071]

[0072]

[0073]

[0074]

[0075]

[0076]

[0077]

[0078]

[0079]

[0080]

[0081]

[0082] In Table 1, the usage refers to a high-level parameter indicating whether the SRS resource set is used for beam management or for codebook-based or non-codebook-based transmission. "spatialRelationInfo" is a parameter indicating the configuration of the spatial relationship between the reference RS and the target SRS. The reference RS can be an SSB, CSI-RS, or SRS corresponding to the L1 parameter "SRS spatialRelationInfo". The usage is configured per SRS resource set.

[0083] - In S120, the UE determines a transmit (Tx) beam for the SRS resource to be transmitted based on the SRS-SpatialRelationInfo included in the SRS-Config IE. The SRS-SpatialRelationInfo is configured per SRS resource and indicates whether the same beam as that used for SSB, CSI-RS, or SRS is applied per SRS resource. In addition, the SRS-SpatialRelationInfo may be configured or not configured in each SRS resource.

[0084] -If SRS-SpatialRelationInfo is configured in the SRS resource, the same beam as that used for SSB, CSI-RS or SRS is applied to transmission. However, if SRS-SpatialRelationInfo is not configured in the SRS resource, in S130, the UE randomly determines a transmission beam and transmits the SRS via the determined transmission beam.

[0085] - In addition, the UE may or may not receive feedback on the SRS from the base station (S140).

[0086] At least one of the operations of the UE / base station based on the above S110 to S140 can be applied in combination with the implementation methods related to Rel-18 SRS enhancement described later (for example, at least one of Proposal 1, Proposal 1-1, Proposal 1-2, Proposal 1-3 and / or Proposal 2).

[0087] Rel-17 SRS Enhancement in MIMO

[0088] In NR TDD systems, the importance of UE SRS transmission to ensure UL and DL channel estimation performance has increased. Therefore, standardization was implemented in Rel-17 MIMO with the following three goals:

[0089] First, the goal of implementing standardization is to more flexibly control aperiodic SRS transmission according to the DL and UL time slot ratios and traffic conditions of various TDD systems.

[0090] Second, NR UEs supporting DL rank 8 transmission must be equipped with at least 8 receive antennas, but the SRS antenna change transmission technique for estimating DL channels based on channel reciprocity in NR TDD systems only supports UEs with up to 4 receive antennas. Therefore, the goal of standardizing Rel-17 is to support the SRS antenna change transmission technique for UEs equipped with more than 4 receive antennas.

[0091] Third, the purpose of implementing standardization is to increase the transmission coverage of SRS and to increase the capacity of SRS to consider simultaneous access of multiple UEs.

[0092] More flexible aperiodic SRS transmission triggering technology

[0093] Figure 2 is a diagram illustrating flexible aperiodic SRS transmission timing control.

[0094] In Rel-17 MIMO, in order to more flexibly control aperiodic SRS transmission according to DL and UL time slot ratios of various TDD systems and traffic conditions, the following two technologies are standardized.

[0095] First, a technique for dynamically controlling the slot offset value for aperiodic SRS transmission triggering via DCI is introduced. This is to solve the problem that since the existing slot offset value is semi-persistently fixed, SRS transmission may be significantly delayed depending on DL and UL slot configurations.

[0096] To this end, a new DCI field is defined that specifies one of multiple slot offset values ​​set in the RRC message. In addition, the slot offset value indicated by the DCI field is standardized to be calculated based on the available time slot defined as a time slot consisting of an uplink time slot and a flexible symbol, thereby enabling flexible SRS transmission triggering with a smaller number of slot offset candidate values.

[0097] Secondly, a technique for triggering aperiodic SRS transmission without UL data transmission and CSI reporting is introduced. According to the existing scheme, in SRS transmission, SRS can be triggered together with SRS through UL DCI only when PUSCH is allocated for triggering UL data and / or CSI reporting. In the case where there is no UL data to send and aperiodic CSI reporting is not required, it is difficult for the BS to estimate the UL / DL channel by triggering SRS for the UE. This technique aims to solve the above problems.

[0098] SRS antenna change transmission for UE equipped with more than 4 receive antennas

[0099] As mentioned above, the SRS antenna change transmission technology supported in the Rel-15 / 16 NR system only considers UEs equipped with 4 receive antennas. In Rel-17 MIMO, the SRS antenna change transmission method for UEs equipped with 6 receive antennas and 8 receive antennas is standardized. The extended antenna change transmission method supports the following combinations of Nt number of transmit antennas and Nr number of receive antennas.

[0100] UEs with Nr=6: Nt=1 and Nt=2, UEs with Nr=8: Nt=1, Nt=2 and Nt=4

[0101] The above-mentioned SRS transmission may be sent within one time slot, or may be sent across two or four time slots.

[0102] SRS coverage and capacity enhancement technology

[0103] Figure 3 is a diagram illustrating partial-band SRS transmission.

[0104] To increase the coverage and capacity of SRS in Rel-17 MIMO, three main technologies are introduced.

[0105] First, the maximum number of transmission repetitions of SRS is increased so that SRS can be used in systems that require wider coverage. In Rel-15 and Rel-16, SRS can be repeated in up to 4 symbols in a time slot, except for positioning purposes. In Rel-17 MIMO, in order to ensure wider SRS coverage, SRS can be repeated in up to 14 symbols in a time slot. Specifically, SRS can be sent in 8, 10, 12 or 14 consecutive symbols in a time slot.

[0106] Secondly, SRS can be sent only in part of the frequency band. To this end, the base station can configure the resource block location and SRS transmission frequency band for starting SRS transmission to the UE. For SRS transmission, the frequency position can also be jumped or fixed according to the set rules based on the SRS frequency hopping period. The introduction of this technology increases the capacity of SRS by allowing different UEs to send SRS to the same BS simultaneously in different parts of the frequency band.

[0107] Finally, SRS with lower frequency density is supported. In addition to the positioning in Rel-15 / 16, the frequency density of SRS supported is 1 RE for every 2 REs or 1 RE for every 4 REs. Therefore, stable channel estimation performance can be ensured in a frequency selective channel environment, but there is a limitation in ensuring SRS capacity. Therefore, in Rel-17 MIMO, another transmission technology is introduced to send SRS in a manner of 1 RE for every 8 REs, thereby further increasing SRS capacity in a frequency non-selective channel environment.

[0108] The above content can be applied in combination with the method proposed in the present disclosure described below, or can be supplemented to clarify the technical features of the method proposed in the present disclosure. The methods described below are distinguished only for the convenience of description. It goes without saying that some components of any one method can be replaced by some components of another method, or can be applied in combination with each other.

[0109] In NR Rel-15 MIMO, SRS can be used for UL link adaptation purposes (codebook / non-codebook), beam management purposes, and DL CSI acquisition (antenna switching) purposes. In Rel-17 FeMIMO, in order to improve the coverage and capacity of SRS, standardization is implemented to increase the number of repetitions, introduce RPFS (RB-level partial frequency detection), and support comb value 8.

[0110] In Rel-18, for UEs with 8Tx transmission capability, an enhancement of introducing SRS or 8-port transmission is being discussed. Rel-18 includes content on SRS enhancement to support up to 8 layers of PUSCH transmission related to SRS, as shown in Table 2 below.

[0111] [Table 2]

[0112]

[0113] In addition, as shown in the following standardized protocol (Table 3), SRS resource configuration is being discussed to support 8 ports for SRS with antenna switching, codebook and non-codebook purposes but without beam management purposes.

[0114] In order to support 8-port SRS in antenna switching and codebook usage, the following i) and ii) are being discussed.

[0115] i) Whether to utilize 8 ports in a single SRS resource or in multiple SRS resources.

[0116] ii) Whether to utilize 8 ports in one OFDM symbol or in multiple OFDM symbols (where different ports are mapped to different symbols).

[0117] In this case, in antenna switching and codebook usage, in the case of introducing 8 ports in a single SRS resource having multiple symbols or / and 8 ports in multiple SRS resources, the 8 ports may be configured as follows.

[0118] 8 ports may be divided and configured in multiple symbols in a single SRS resource. For example, 4 ports may be configured in each of two symbols.

[0119] 8 ports may be divided and configured in multiple SRS resources. For example, 4 ports may be configured in each of two SRS resources.

[0120] At this time, it may be necessary to support frequency domain resource allocation (FDRA) configuration for n ports (eg, 4 ports) (divided and configured).

[0121] Table 3 below shows the standardized protocol for SRS enhancement.

[0122] [Table 3]

[0123]

[0124]

[0125] Based on this background, the present disclosure proposes a method for a base station to configure SRS resources according to an 8Tx UE and a subsequent UE SRS transmission operation.

[0126] Unless otherwise limited, the “port” mentioned in the following embodiments may refer to an “SRS port”, an “SRS antenna port” or an “antenna port”.

[0127] In the present disclosure, “ / ” means “and”, “or” or “and / or”.

[0128] Proposal 1

[0129] The base station may divide 8 ports of a single SRS resource (ie, a single SRS resource for 8Tx) into a plurality of symbols (eg, n symbols, n>1) and configure them to the UE.

[0130] For x ports (x is a natural number from 1 to 8) corresponding to each of the n symbols, frequency domain resource allocation (FDRA) can be performed. That is, in a specific SRS resource, FDRA related parameters (such as i) transmissionComb, ii) freqDomainPosition, iii) freqDomainShift, iv) freqHopping (c-SRS, b-SRS, b-hop), etc.) can be configured as n.

[0131] For example, in a specific 8-port SRS resource, the 8 ports can be divided between two OFDM symbols, with 4 ports configured in each OFDM symbol. FDRA-related parameters can be configured in symbols corresponding to the 4 ports of the first (symbol) and the 4 ports of the second (symbol), respectively. In addition, for this SRS resource, FDRA-related parameters (such as i) transmissionComb, ii) freqDomainPosition, iii) freqDomainShift, iv) freqHopping (c-SRS, b-SRS and b-hop), etc.) can be configured as two.

[0132] In addition, in an example in which 8 ports are divided and configured in multiple symbols in a single SRS resource, the following implementations may be considered. Specifically, at least one of the time domain resource allocation (TDRA) related parameters and the FDRA related parameters may be configured as n. For example, within the resourceMapping IE, at least one of i) startPosition, ii) nrofSymbols, and / or iii) repetitionFactor may be configured as n.

[0133] According to one embodiment, a method is proposed in which nrofSymbols can be divided among n x ports even if only one of the TDRA-related parameters is configured in the SRS resource. For example, assume that nrofSymbols is set to 8 and the 8 ports are divided into groups of 4 ports. The first 4 ports and the second 4 ports can be mapped to corresponding groups of 4 symbols. Specifically, the first 4 ports can be mapped to the first 4 symbols among the 8 symbols, and the second 4 ports can be mapped to the second 4 symbols.

[0134] For example, "first / second" can be distinguished by indexes (e.g., port index and symbol index). The first four ports can be based on port indexes 0 to 3, and the second four ports can be based on port indexes 4 to 7. The first four symbols can be based on symbol indexes a to a+3 (e.g., a is an integer greater than or equal to 0), and the second four symbols can be based on symbol indexes a+4 to a+7.

[0135] That is, nrofSymbols may need to be configured in such a way that the n x ports are evenly mapped (in the above example, the number of symbols is set to 8, and the 4 ports are evenly mapped to 4 symbols out of the 8 symbols). Here, the repetitionFactor configured with one value (that is, the repetitionFactor when only one repetitionFactor is configured) may also apply to the first 4 symbols and the second 4 symbols.

[0136] According to an embodiment, when 8 ports are divided and configured in multiple symbols for a single SRS resource, a configuration based on the following [1] and [2] may be applied.

[0137] [1]i) the above FDRA related parameters (transmissionComb, freqDomainPosition, freqDomainShift, freqHopping (c-SRS, b-SRS and b-hop)) or / and ii) sequence related parameters (code domain resources) can be configured as a single number, the same as the existing configuration. The sequence related parameters may include at least one of i) cyclicShift, ii) groupOrSequenceHopping and / or iii) sequenceId.

[0138] [2] The port index of the x ports (x is a natural number from 1 to 8) corresponding to each of the n symbols can be configured per symbol. For example, in a specific 8-port SRS resource, the 8 ports can be divided between two OFDM symbols, with 4 ports configured in each OFDM symbol.

[0139] In this case, for the SRS resource, the FDRA-related parameters and the sequence-related parameters may be configured as a single value, port indexes 1 to 4 may be configured for the first symbol, and port indexes 5 to 8 may be configured for the second symbol.

[0140] Proposal 1-1

[0141] Some parameters configured as n specific SRS resources in Proposal 1 may be set to the same value.

[0142] For example, at least one of the FDRA-related parameters and / or the TDRA-related parameters (parameters configured as multiple values) may be set to the same value. For example, the value set for at least one of the FDRA-related parameters and / or the TDRA-related parameters (parameters configured as multiple values) may be limited to a specific value among the values ​​that can be set for the parameter.

[0143] This will be specifically described by way of example.

[0144] Assuming that two transmissionCombs are configured, the comb value of the first transmissionComb and the comb value of the second transmissionComb can be set to the same value (eg, n2).

[0145] Assuming that two freqDomainPositions are configured, the first freqDomainPosition and the second freqDomainPosition may be set to the same value (eg, a value between 0 and 67).

[0146] For example, at least one of freqDomainPosition, freqDomainShift, c-SRS, b-SRS, and b-hop can be set to the same value. In this way, the x ports corresponding to each symbol can be configured to have i) the same SRS bandwidth, ii) the same frequency domain position, and / or iii) the same setting for frequency hopping or non-frequency hopping.

[0147] For example, in the transmissionComb configuration, at least one of the comb value, combOffset, and cyclicShift can be set to the same value. In this way, the x ports corresponding to each symbol can be configured to have i) the same density (i.e., the same frequency density) within the SRS bandwidth, ii) the same frequency domain position based on the same comb offset value, and / or iii) the same cyclic shift value.

[0148] In Proposal 1, for a TDRA-related parameter configured with n specific SRS resources, at least one of nrofSymbols and repetitionFactor can be set to the same value. The base station can perform channel estimation of the x ports configured for each of the n symbols under the same conditions (the same number of symbols and the same number of repetitions).

[0149] Proposal 1-2

[0150] In Proposal 1, when x ports (x is a natural number from 1 to 8) corresponding to each of n symbols are configured for a specific SRS resource, some parameters may be configured in the form of offset values. Specifically, when some parameters are configured for the (first) x ports of the first symbol, an offset value relative to the value set for the (first) x ports of the first symbol may be set for the (second / third...) x ports configured for each of the remaining symbols.

[0151] That is, some parameters within the SRS resource may be configured with (n-1) offset values. In other words, an offset value may be set for each of the remaining symbols (n-1 symbols) except the first symbol among the n symbols.

[0152] Some parameters may include at least one of combOffset and cyclicShift.

[0153] For example, assuming that in a particular 8-port SRS resource, 8 ports can be divided between two OFDM symbols, with 4 ports configured in each OFDM symbol. In this case, the transmissionComb configuration (e.g., n4) can be performed as follows for the first (symbol) 4 ports. combOffset can be set to 0, and cyclicShift can be set to 0.

[0154] The combOffset and / or cyclicShift of the second (symbol) 4 ports can be configured as offset values ​​relative to the combOffset (0) and / or cyclicShift value (0) set above.

[0155] Assume that in a specific 8-port SRS resource, 8 ports can be divided between two OFDM symbols, and 4 ports are configured in each OFDM symbol. In this case, the following implementation methods can be considered.

[0156] Only one offset value may be set to configure combOffset or / and cyclicShift of the remaining three symbols except the first symbol. In other words, one offset value may be set and applied to each of the remaining three symbols, instead of setting three offset values ​​to configure combOffset or / and cyclicShift of the remaining three symbols.

[0157] Specifically, only one offset value may be set, and thus this one offset value may be applied as an offset relative to the combOffset or / and cyclicShift value of the previous symbol (e.g., the first / second / third symbol). For example, the combOffset or / and cyclicShift value of the second symbol may be determined by adding the one offset value to the combOffset or / and cyclicShift value of the first symbol. For example, the combOffset or / and cyclicShift value of the third / fourth symbol may be determined by adding the one offset value to the combOffset or / and cyclicShift value of the second / third symbol.

[0158] For example, if only one offset value 1 is set for combOffset, the combOffset values ​​of the first / second / third / fourth symbols may be 0, 1, 2, and 3, respectively.

[0159] For example, if only one offset value 2 is set for cyclicShift, the cyclicShift values ​​of the first / second / third / fourth symbols may be 0, 2, 4, and 6, respectively. According to this embodiment, the following effects can be obtained: Compared with setting a separate combOffset or / and cyclicShift value for each of the (n-1) symbols, signaling overhead can be reduced.

[0160] Proposal 1-3

[0161] In Proposal 1, in the case where 8 ports are mapped to n symbols in a specific SRS resource, the n symbols may be consecutive OFDM symbols. That is, the 8 ports may be configured / mapped to consecutive OFDM symbols without interval symbols.

[0162] According to the existing method, the configuration of the interval symbol is as follows. If the SRS resource set is configured for antenna switching, an interval symbol (i.e., a guard period) for antenna switching is configured between SRS resources of different ports in the same time slot. The guard period can be configured to be 1, 2, 7, or 14 symbols per subcarrier interval.

[0163] According to this embodiment, even if the purpose of the SRS resource set including the specific SRS resource is antenna switching, no spacing symbol (guard period) may be configured between n symbols. As described above, 8 ports may be configured / mapped to n consecutive symbols.

[0164] In the existing antenna switching SRS operation, a transition period is required to switch the Rx / Tx port of the UE to other Rx / Tx ports (corresponding to the SRS resources). The transition period can be the time required for the RF switching operation (e.g., the switching operation of the RF module / chain). Since different Rx / Tx ports correspond to different SRS resources, time domain resource allocation is performed so that there is a guard period between the SRS resources. According to the above-mentioned existing method, a guard period of Y symbols is configured between the SRS resources of the SRS resource set for antenna switching.

[0165] However, in Rel-18, it is assumed that the 8Tx UE is a UE capable of UL 8 layer transmission. In other words, the UE can perform 8-port UL transmission simultaneously. Since there is no need to consider the transition time for RF switching between each symbol corresponding to different ports, this embodiment can be applied.

[0166] Through the above implementation, it is possible to avoid wasting resources due to configuring interval time periods.

[0167] Proposal 2

[0168] In the case where the base station configures 8 ports for the UE in multiple SRS resources, the following implementations may be considered.

[0169] According to an embodiment, when configuring each SRS resource, some of the FDRA-related parameters or / and the sequence-related parameters may be set to the same values ​​as in Proposal 1 (Proposal 1-1). In other words, the values ​​that can be set for some of the FDRA-related parameters or / and the sequence-related parameters may be limited to one of the values ​​that can be set for the parameter.

[0170] According to an embodiment, when configuring SRS resources, some of the TDRA-related parameters may be set to the same values ​​as in Proposal 1. In other words, the values ​​that can be set for some of the TDRA-related parameters may be limited to one of the values ​​that can be set for the parameter.

[0171] According to an embodiment, in the TDRA configuration of SRS resources, the symbol-level positions of different SRS resources may be configured to be non-overlapping. For example, the SRS resource configuration of the base station may be performed under the above restrictions.

[0172] According to an embodiment, even if the symbol-level positions of different SRS resources are allowed to overlap, different SRS resources can be configured to have exactly the same symbol position and duration (i.e., located in the same symbol). Through this operation / configuration, the UE can simultaneously send multiple SRS resources constituting 8 ports in the same symbol. The base station can perform channel sounding for UL / DL 8 ports in the same (instantaneous) channel environment.

[0173] According to an embodiment, the following operations may be performed / configured for UEs that are not capable of STxMP transmission.

[0174] For each of the multiple SRS resources, the TCI state or / and spatialRelationInfo may be set to the same value. In other words, the TCI state or / and spatialRelationInfo that may be configured in each of the multiple SRS resources may be limited to the same TCI state or / and spatialRelationInfo. That is, the above operation may mean that the UE performs up to 8Tx transmission (i.e., transmission based on up to 8 layers) in relation to a single panel.

[0175] If a particular UE is capable of STxMP transmission, then for each of the multiple SRS resources, the TCI state or / and spatialRelationInfo may be set to different values ​​(not the same value). That is, the above operation may mean that the UE performs up to 8Tx transmissions (i.e., transmissions based on up to 8 layers) in relation to multiple panels / TRPs.

[0176] Unless Proposal 1 and Proposal 2 are under contradictory conditions / configurations, the implementation methods of Proposal 1 or Proposal 2 can be applied / implemented in combination.

[0177] The following is an example of UE (base station) operation based on at least one of the above-mentioned embodiments (for example, at least one of Proposal 1 or Proposal 2).

[0178] 1) UE (base station) receives (sends) SRS related configuration information.

[0179] The above configuration information may include FDRA / TDRA / sequence-related configuration of SRS resources within an SRS resource set for a specific purpose (eg, codebook or / and antenna switching) based on Proposal 1 or Proposal 2.

[0180] 2) The UE sends the SRS according to the P / SP / AP-SRS transmission configuration / activation / indication (that is, the base station receives the SRS from the UE).

[0181] In this case, the UE sends SRS based on the configuration of Proposal 1 or Proposal 2 based on the SRS resource set configured / activated / indicated by RRC / MAC CE / DCI.

[0182] The above UE / base station operations are only examples, and each operation (or step) is not necessary. Depending on the method implemented by the UE / base station, operations related to the SRS transmission of the UE according to the aforementioned implementation may be omitted or added.

[0183] In terms of implementation, the operation of the base station / UE according to the above embodiment (for example, the operation based on at least one of Proposal 1, Proposal 1-1, Proposal 1-2, Proposal 1-3 and / or Proposal 2) can be performed by Figure 6 Devices in (e.g. Figure 6 Processed by processors 110 and 210).

[0184] In addition, the operation of the base station / UE according to the above-mentioned embodiment (for example, the operation based on at least one of Proposal 1, Proposal 1-1, Proposal 1-2, Proposal 1-3 and / or Proposal 2) can be stored in the form of a command / program (for example, an instruction or an executable code) in a memory (for example, Figure 6 140 and 240), for driving at least one processor ( Figure 6110 and 210 in ).

[0185] The following will be combined Figure 4 and Figure 5 The above embodiments are described in detail in terms of the operations of the UE and the base station. The methods described below are differentiated only for the convenience of description, and it goes without saying that some components of any one method can be replaced by some components of another method, or can be applied in combination with each other.

[0186] Figure 4 is a flowchart for describing a method performed by a user equipment according to an embodiment of the present disclosure.

[0187] Reference Figure 4 According to one embodiment of the present disclosure, the method performed by the UE in the wireless communication system includes an SRS related configuration information receiving step S410 and an SRS sending step S420.

[0188] In S410, the UE receives configuration information related to a sounding reference signal (SRS) from a base station. The configuration information includes information for at least one SRS resource. For example, the configuration information may be based on the SRS-Config in Table 1. The purpose of the SRS resource set to which the at least one SRS resource belongs may be configured as codebook, non-codebook, beam management, or antenna switching.

[0189] The configuration information may include configuration-related information based on at least one of the above-mentioned Proposal 1, Proposal 1-1, Proposal 1-2, Proposal 1-3 and / or Proposal 2.

[0190] According to an embodiment, at least one SRS resource may be associated with eight ports. For example, eight ports may be configured in a single SRS resource. For example, eight ports may be configured in multiple SRS resources.

[0191] According to an embodiment, 8 ports may be mapped to a plurality of symbols associated with at least one SRS resource. Mapping may mean that the 8 ports are evenly divided and mapped to a plurality of symbols.

[0192] Specifically, the number of one or more ports associated with each symbol in the plurality of symbols may be the same. For example, if the plurality of symbols is two symbols, the number of ports mapped to each symbol may be 4. In a specific example, the plurality of symbols may be two symbols. Four ports among the eight ports may be mapped to the first symbol (or the first symbol) among the two symbols. The remaining four ports among the eight ports may be mapped to the second symbol (or the second symbol) among the two symbols. For example, eight ports may be evenly mapped to each symbol in the plurality of symbols. Specifically, the number of ports (e.g., 4) mapped to each symbol may be determined by dividing the number of ports (e.g., 8) by the number of the plurality of symbols (e.g., 2). This embodiment may be based on Proposal 1 or Proposal 2.

[0193] According to an embodiment, i) a first parameter related to the frequency domain, ii) a second parameter related to the time domain, and iii) a third parameter related to the sequence may be configured in at least one SRS resource.

[0194] Here, the first parameter, the second parameter and the third parameter may be based on the above-mentioned Proposal 1 / Proposal 2. Specifically, the first parameter may be based on the FDRA-related parameter. The second parameter may be based on the TDRA-related parameter. The third parameter may be based on the sequence-related parameter.

[0195] The first parameter may include: i) transmissionComb related to the transmission comb value, ii) freqDomainPosition related to the frequency domain position, iii) freqDomainShift related to the frequency domain shift, and iv) freqHopping related to the frequency hopping. In this case, the first parameter may include combOffset and cyclicShift configured based on the transmissionComb value (e.g., n2 or n4, see Table 1).

[0196] The second parameter may include: i) startPosition related to a starting symbol position, ii) nrofSymbols related to the number of symbols, and iii) repetitionFactor related to repetition of the SRS.

[0197] The third parameter may include: i) groupOrSequenceHopping related to group hopping and / or sequence hopping and ii) sequenceId for sequence initialization.

[0198] For example, the first / second / third parameters may include parameters configured in the SRS-Resource of Table 1.

[0199] Based on the number of the plurality of symbols, at least one of the first to third parameters may be configured as a plurality of values ​​or a single value. This will be described in detail below.

[0200] According to an embodiment, at least one of the first parameters may be configured as a plurality of values ​​based on the number of the plurality of symbols. This embodiment may be based on Proposal 1. For example, one of the first parameters (e.g., "startPosition") may be configured as a plurality of values. Specifically, if the number of the plurality of symbols is 2, a startPosition associated with the first symbol and a startPosition associated with the second symbol may be configured in at least one SRS resource (e.g., a single SRS resource).

[0201] According to an embodiment, at least one of the second parameters may be configured as a plurality of values ​​based on the number of the plurality of symbols. This embodiment may be based on Proposal 1. For example, one of the second parameters (e.g., "freqDomainPosition") may be configured as a plurality of values. Specifically, if the number of the plurality of symbols is 2, a freqDomainPosition associated with the first symbol and a freqDomainPosition associated with the second symbol may be configured in at least one SRS resource (e.g., a single SRS resource).

[0202] Some parameters configured as multiple values ​​based on the above implementation can be set to the same value, which will be described in detail below.

[0203] According to an embodiment, some of the plurality of parameters configured based on the number of the plurality of symbols may be set to the same value. This embodiment may be based on Proposal 1-1.

[0204] Here, some of the multiple parameters may refer to some of the parameters configured as multiple values. For example, assuming that among the first parameters, freqDomainPosition and freqDomainShift may be configured as quantities equal to the number of multiple symbols. In this case, the multiple parameters may refer to freqDomainPosition and freqDomainShift among the first parameters. Some of the multiple parameters may refer to freqDomainPosition (or freqDomainShift).

[0205] For example, according to the above example, the freqDomainPosition associated with the first symbol and the freqDomainPosition associated with the second symbol can be set to the same value. In other words, among the values ​​that can be set for freqDomainPosition (e.g., INTEGER (0..67) in Table 1), the freqDomainPosition associated with the first symbol and the freqDomainPosition associated with the second symbol can be set to the same value (e.g., one of 0 to 67).

[0206] The parameters configured as multiple values ​​based on the above embodiment can be configured based on one parameter and an offset for the one parameter. This will be described in detail below.

[0207] According to an embodiment, the plurality of parameters configured based on the number of the plurality of symbols (e.g., n, where n>1) may include: i) a parameter associated with a first symbol among the plurality of symbols and ii) a parameter determined based on the parameter associated with the first symbol and offsets associated with the remaining symbols (e.g., (n-1) offsets). This embodiment may be based on Proposal 1-2.

[0208] For example, if the number of the plurality of symbols is 2, combOffset and / or cyclicShift among the first parameters may be configured as 2. In a specific example, combOffset associated with the first symbol and combOffset associated with the second symbol may be configured. In this case, if combOffset associated with the first symbol is set to 1, combOffset associated with the second symbol may be set based on an offset (e.g., 2) for combOffset(1) associated with the first symbol. That is, combOffset associated with the second symbol may be set to 3.

[0209] That is, if the number of the multiple symbols is n, one parameter (eg, at least one of the first parameters (combOffset)) and an offset for the one parameter (eg, (n-1) offsets) may be configured in at least one SRS resource.

[0210] According to an embodiment, the index of one or more ports associated with each symbol may be configured in at least one SRS resource. This embodiment may be based on Proposal 1.

[0211] For example, assuming that the number of the plurality of symbols is 2, i) port indexes 1 to 4 associated with the first symbol and ii) port indexes 5 to 8 associated with the second symbol may be configured in at least one SRS resource.

[0212] According to the existing method, the SRS resource set configured for antenna switching is configured with a guard period for antenna switching between SRS resources associated with different ports. The guard period is to ensure the time required for RF module operation (e.g., RF chain change) associated with antenna switching. However, in the case where the UE supports (simultaneous) transmission based on up to 8 ports (up to 8 layers), there is no need to configure a separate guard period for antenna switching. An embodiment for enhancing the efficiency of SRS resource allocation for antenna switching will be described in detail below.

[0213] According to an embodiment, at least one SRS resource may be based on an SRS resource set for antenna switching. A plurality of symbols may be consecutive symbols configured in at least one SRS resource without a guard period configured for antenna switching. This embodiment may be based on Proposals 1-3. As described above, even when SRS is configured for antenna switching, SRS may be configured in consecutive symbols without a guard period. Since unnecessary guard period configuration is omitted in view of UE performance, resource utilization may be enhanced when SRS is configured for antenna switching.

[0214] According to an embodiment, the at least one SRS resource may include a plurality of SRS resources. The plurality of symbols may include one or more symbols configured based on the second parameter of each SRS resource. This embodiment may be based on Proposal 2.

[0215] In an example, the position of one or more symbols configured in one of the multiple SRS resources may be different from the position of one or more symbols configured in another of the multiple SRS resources. That is, symbols associated with one SRS resource may be configured not to overlap symbols associated with another SRS resource.

[0216] In the example, the position of one or more symbols configured in one SRS resource among the multiple SRS resources may be the same as the position of one or more symbols configured in another SRS resource among the multiple SRS resources. That is, the symbol associated with one SRS resource may be the same as the symbol associated with another SRS resource. That is, the UE may send SRS based on 8 ports in the same symbol. The base station may perform channel sounding on 8 ports in the same (instantaneous) channel environment.

[0217] According to an embodiment, a transmission configuration indicator (TCI) state and / or spatial relationship information may be configured in each SRS resource based on the UE's capability related to simultaneous transmission across multiple panels (STxMP). This embodiment may be based on Proposal 2.

[0218] In an example, based on the UE not supporting STxMP, the TCI state and / or spatial relationship information configured in each SRS resource may be the same.

[0219] In the example, based on the UE supporting STxMP, the TCI state and / or spatial relationship information configured in each SRS resource may be different. In other words, the TCI state and / or spatial relationship information configured in one SRS resource among multiple SRS resources may be different from the TCI state and / or spatial relationship information configured in another SRS resource among multiple SRS resources.

[0220] In S420, the UE sends an SRS to the base station based on at least one SRS resource.

[0221] For example, the SRS may be transmitted to a plurality of symbols based on at least one SRS resource.

[0222] For example, the SRS may be transmitted to a plurality of symbols based on 8 ports.

[0223] For example, in each symbol, the SRS may be transmitted based on a port mapped to the corresponding symbol.

[0224] The SRS may be a periodic SRS, an aperiodic SRS, or a semi-persistent SRS.

[0225] The method may further include a DCI receiving step. In the DCI receiving step, the UE receives downlink control information (DCI) related to the SRS from the base station.

[0226] In an example, the DCI may be a DCI that triggers SRS.

[0227] In an example, the DCI may be a DCI scheduling a physical uplink shared channel (PUSCH).

[0228] The DCI receiving step may be performed before S420 or after S420.

[0229] In an example, the DCI may be a DCI that triggers SRS (or an SRS resource set). In an example, the DCI may be a DCI that schedules PUSCH after SRS transmission.

[0230] The method may also include a PUSCH transmission step. In the PUSCH transmission step, the UE transmits a PUSCH based on the DCI. The number of layers associated with the PUSCH may be 5 or more. In an example, the PUSCH may be transmitted based on up to 8 layers. The transmission type for the PUSCH may be a codebook or a non-codebook. The PUSCH may be transmitted based on an antenna port. The PUSCH transmission step may be performed after the DCI reception step.

[0231] According to an embodiment, the DCI may include an SRS resource indicator (SRI) field. One or more SRS resources among the SRS resources of the SRS resource set may be determined based on the SRI field. The antenna port may be based on a port associated with one or more SRS resources. The port associated with one or more SRS resources may be based on 8 ports.

[0232] Can be Figure 6 The device implements the operations based on the above steps S410 to S420, the DCI receiving step and the PUSCH sending step. For example, the UE 200 may control one or more transceivers 230 and / or one or more memories 240 to perform the operations based on steps S410 to S420, the DCI receiving step and the PUSCH sending step.

[0233] The aforementioned embodiments will be described in detail below in terms of base station operations.

[0234] Steps S510 to S520, DCI transmission step and PUSCH reception step described below correspond to Figure 4 Steps S410 to S420, DCI receiving step and PUSCH sending step described in the above description. In view of the corresponding relationship, redundant description will be omitted. That is to say, the detailed description of the base station operation to be described below can be replaced by Figure 4 Description / implementation method corresponding to the operation.

[0235] For example, Figure 4 The description / implementation of S410-S420 can be additionally applied to the base station operation of S510-S520 to be described below. In the example, the description / implementation of the above DCI receiving step and PUSCH sending step can be additionally applied to the base station operation according to the DCI sending step and PUSCH receiving step to be described below.

[0236] Figure 5 is a flowchart for describing a method performed by a base station according to another embodiment of the present disclosure.

[0237] In S510, the base station sends configuration information related to a sounding reference signal (SRS) to a UE.

[0238] In S520 , the base station receives an SRS based on at least one SRS resource from the UE.

[0239] The method may further include a DCI sending step. In the DCI sending step, the base station sends downlink control information (DCI) related to the SRS to the UE. The DCI sending step may be performed before or after S520.

[0240] The method may further include a PUSCH receiving step. In the PUSCH receiving step, the base station receives a PUSCH from the UE based on the DCI. The PUSCH receiving step may be performed after the DCI sending step.

[0241] Can be Figure 6 The base station 100 may control one or more transceivers 130 and / or one or more memories 140 to perform operations based on steps S510 to S520, DCI transmission steps, and PUSCH reception steps.

[0242] Refer to the following Figure 6 The following describes a device to which the embodiments of the present disclosure are applicable (a device that implements the method / operation according to the embodiments of the present disclosure).

[0243] Figure 6 The configurations of the first device and the second device according to the embodiment of the present disclosure are illustrated.

[0244] The first device 100 may include a processor 110 , an antenna unit 120 , a transceiver 130 , and a memory 140 .

[0245] The processor 110 may perform signal processing related to the baseband, and includes a high-level processing unit 111 and a physical layer processing unit 115. The high-level processing unit 111 may process operations of a MAC layer, an RRC layer, or a higher layer. The physical layer processing unit 115 may process operations of a PHY layer. For example, if the first device 100 is a base station (BS) device in BS-UE communication, the physical layer processing unit 115 may perform uplink received signal processing, downlink transmitted signal processing, etc. For example, if the first device 100 is a first UE device in inter-UE communication, the physical layer processing unit 115 may perform downlink received signal processing, uplink transmitted signal processing, sidelink transmitted signal processing, etc. In addition to performing signal processing related to the baseband, the processor 110 may also control the overall operation of the first device 100.

[0246] The antenna unit 120 may include one or more physical antennas, and if the antenna unit 120 includes multiple antennas, MIMO transmission / reception is supported. The transceiver 130 may include a radio frequency (RF) transmitter and an RF receiver. The memory 140 may store information processed by the processor 110 and software, an operating system, and applications related to the operation of the first device 100. The memory 140 may also include components such as a buffer.

[0247] In the embodiments described in the present disclosure, the processor 110 of the first device 100 may be configured to implement operations of a BS in BS-UE communication (or operations of a first UE device in inter-UE communication).

[0248] The second device 200 may include a processor 210 , an antenna unit 220 , a transceiver 230 , and a memory 240 .

[0249] The processor 210 may perform signal processing related to the baseband, and includes a high-level processing unit 211 and a physical layer processing unit 215. The high-level processing unit 211 may process operations of a MAC layer, an RRC layer, or a higher layer. The physical layer processing unit 215 may process operations of a PHY layer. For example, if the second device 200 is a UE device in BS-UE communication, the physical layer processing unit 215 may perform downlink received signal processing, uplink transmitted signal processing, etc. For example, if the second device 200 is a second UE device in inter-UE communication, the physical layer processing unit 215 may perform downlink received signal processing, uplink transmitted signal processing, side link received signal processing, etc. In addition to performing signal processing related to the baseband, the processor 210 may also control the overall operation of the second device 200.

[0250] The antenna unit 220 may include one or more physical antennas, and if the antenna unit 220 includes multiple antennas, MIMO transmission / reception is supported. The transceiver 230 may include an RF transmitter and an RF receiver. The memory 240 may store information processed by the processor 210 and software, operating systems, and applications related to the operation of the second device 200. The memory 240 may also include components such as a buffer.

[0251] In the embodiments described in the present disclosure, the processor 210 of the second device 200 may be configured to implement the operation of the UE in BS-UE communication (or the operation of the second UE device in inter-UE communication).

[0252] The description of the BS and the UE in BS-UE communication (or the first UE device and the second UE device in inter-UE communication) in the examples of the present disclosure are equally applicable to the operations of the first device 100 and the second device 200, and redundant descriptions are omitted.

[0253] In addition to LTE, NR, and 6G, the wireless communication technology implemented in the apparatus 100 and the apparatus 200 according to the present disclosure may also include a narrowband Internet of Things (NB-IoT) for low-power communication. For example, the NB-IoT technology may be an example of a low-power wide area network (LPWAN) technology and may be implemented in standards such as LTE Cat NB1 and / or LTE Cat NB2. The NB-IoT technology is not limited to the above names.

[0254] Additionally or alternatively, the wireless communication technology implemented in the apparatus 100 and the apparatus 200 according to the present disclosure may perform communication based on the LTE-M technology. For example, the LTE-M technology may be an example of the LPWAN technology and may be referred to as various names, such as enhanced machine type communication (eMTC). For example, the LTE-M technology may be implemented with at least one of various standards, such as 1) LTE CAT0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-bandwidth limited), 5) LTE-MTC, 6) LTE machine type communication and / or 7) LTE M. The LTE-M technology is not limited to the above names.

[0255] Additionally or alternatively, in consideration of low power communication, the wireless communication technology implemented in the apparatus 100 and the apparatus 200 according to the present disclosure may include at least one of ZigBee, Bluetooth, and a low power wide area network (LPWAN), and is not limited to the above names. For example, ZigBee technology may create a personal area network (PAN) related to small / low power digital communication based on various standards such as IEEE 802.15.4, and may be referred to by various names.

Claims

1. A method performed by a user equipment UE in a wireless communication system, the method comprising the following steps: receiving configuration information related to a sounding reference signal (SRS), the configuration information including information for at least one SRS resource; as well as sending the SRS based on the at least one SRS resource, Wherein, the at least one SRS resource is associated with eight ports, The eight ports are divided and mapped to a plurality of symbols related to the at least one SRS resource, and the number of the one or more ports associated with each symbol in the plurality of symbols is the same.

2. The method according to claim 1, wherein: In the at least one SRS resource, i) a first parameter related to the frequency domain, ii) a second parameter related to the time domain, and iii) a third parameter related to the sequence are configured.

3. The method according to claim 2, wherein: The first parameters include: i) transmissionComb related to the transmission comb value, ii) freqDomainPosition related to the frequency domain position, iii) freqDomainShift related to the frequency domain shift, and iv) freqHopping related to the frequency hopping.

4. The method according to claim 2, wherein: The second parameters include: i) startPosition related to a starting symbol position, ii) nrofSymbols related to the number of symbols, and iii) repetitionFactor related to repetition of the SRS.

5. The method according to claim 2, wherein: The third parameter includes: i) groupOrSequenceHopping related to group hopping and / or sequence hopping, and ii) sequenceId used for sequence initialization.

6. The method according to claim 2, wherein: At least one of the first parameters is configured as a plurality of values ​​based on the number of the plurality of symbols.

7. The method according to claim 2, wherein: At least one of the second parameters is configured as a plurality of values ​​based on the number of the plurality of symbols.

8. The method according to claim 6 or 7, wherein: Some of the plurality of parameters configured based on the number of the plurality of symbols are set to the same value.

9. The method according to claim 6 or 7, wherein: The plurality of parameters configured based on the number of the plurality of symbols include: i) a parameter associated with a first symbol among the plurality of symbols, and ii) a parameter determined based on the parameter associated with the first symbol and an offset associated with remaining symbols.

10. The method according to claim 1, wherein: An index of the one or more ports associated with each symbol is configured in the at least one SRS resource.

11. The method according to claim 1, wherein: The at least one SRS resource is based on an SRS resource set for antenna switching, and the plurality of symbols are consecutive symbols configured in the at least one SRS resource without configuring a guard period for antenna switching.

12. The method according to claim 2, wherein: The at least one SRS resource includes a plurality of SRS resources, and the plurality of symbols include one or more symbols configured based on the second parameter of each SRS resource.

13. The method according to claim 12, wherein: Positions of one or more symbols configured in one SRS resource among the plurality of SRS resources are different from positions of one or more symbols configured in another SRS resource among the plurality of SRS resources.

14. The method according to claim 12, wherein: Positions of one or more symbols configured in one SRS resource among the plurality of SRS resources are the same as positions of one or more symbols configured in another SRS resource among the plurality of SRS resources.

15. The method according to claim 12, wherein: Based on the capability of the UE related to simultaneous transmission of STxMP across multiple panels, a transmission configuration indicator TCI state and / or spatial relationship information is configured in each SRS resource.

16. The method according to claim 15, wherein: Based on the fact that the UE does not support the STxMP, the TCI state and / or the spatial relationship information configured in each SRS resource are the same.

17. The method according to claim 1, wherein: The plurality of symbols are two symbols, four ports among the eight ports are mapped to a first symbol among the two symbols, and the remaining four ports among the eight ports are mapped to a second symbol among the two symbols.

18. A user equipment UE operating in a wireless communication system, the UE comprising: one or more transceivers; one or more processors; as well as one or more memories operatively connectable to the one or more processors and storing instructions configured to cause the one or more processors to perform operations upon execution by the one or more processors, The operations include: receiving configuration information related to a sounding reference signal (SRS), the configuration information including information for at least one SRS resource; and sending the SRS based on the at least one SRS resource, Wherein, the at least one SRS resource is associated with eight ports, The eight ports are divided and mapped to a plurality of symbols related to the at least one SRS resource, and the number of the one or more ports associated with each symbol in the plurality of symbols is the same.

19. A device comprising one or more memories and one or more processors, the one or more processors being functionally connected to the one or more memories, in, The one or more memories include instructions that upon execution by the one or more processors configure the one or more processors to perform operations, The operations include: receiving configuration information related to a sounding reference signal (SRS), the configuration information including information for at least one SRS resource; and sending the SRS based on the at least one SRS resource, Wherein, the at least one SRS resource is associated with eight ports, The eight ports are divided and mapped to a plurality of symbols related to the at least one SRS resource, and the number of the one or more ports associated with each symbol in the plurality of symbols is the same.

20. One or more non-transitory computer-readable media storing one or more commands, in, The one or more commands executable by one or more processors are configured to cause the one or more processors to perform operations, The operations include: receiving configuration information related to a sounding reference signal (SRS), the configuration information including information for at least one SRS resource; and sending the SRS based on the at least one SRS resource, Wherein, the at least one SRS resource is associated with eight ports, The eight ports are divided and mapped to a plurality of symbols related to the at least one SRS resource, and the number of the one or more ports associated with each symbol in the plurality of symbols is the same.

21. A method performed by a base station in a wireless communication system, the method comprising the following steps: Sending configuration information related to a sounding reference signal (SRS), the configuration information including information for at least one SRS resource; as well as receiving the SRS based on the at least one SRS resource, Wherein, the at least one SRS resource is associated with eight ports, The eight ports are divided and mapped to a plurality of symbols related to the at least one SRS resource, and the number of the one or more ports associated with each symbol in the plurality of symbols is the same.

22. A base station operating in a wireless communication system, the base station comprising: one or more transceivers; one or more processors; as well as one or more memories operatively connectable to the one or more processors and storing instructions configured to cause the one or more processors to perform operations upon execution by the one or more processors, The operations include: Sending configuration information related to a sounding reference signal (SRS), wherein the configuration information includes information for at least one SRS resource; and receiving the SRS based on the at least one SRS resource, Wherein, the at least one SRS resource is associated with eight ports, The eight ports are divided and mapped to a plurality of symbols related to the at least one SRS resource, and the number of the one or more ports associated with each symbol in the plurality of symbols is the same.

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