Method for transmitting and receiving SRS in wireless communication system and apparatus therefor

Abstract

A method according to an embodiment of the present specification comprises the steps of: receiving configuration information related to an SRS; and transmitting the SRS on the basis of the SRS resource. Initialization related to comb offset hops and / or cyclic shift hops configured on resources is performed based on a period. The period is determined based on at least one of i) a setpoint, ii) a repetition factor associated with the SRS, iii) a value associated with frequency hopping, and / or iv) a time slot associated with the SRS.

Description

TECHNICAL FIELD

[0001] The disclosure relates to a method for transmitting and receiving a sounding reference signal (SRS) in a wireless communication system and an apparatus thereof. BACKGROUND

[0002] Mobile communication systems have evolved to guarantee user activities while providing voice services. Mobile communication systems are expanding their services from only voice to data. The current explosive data traffic is exhausting resources, and user requirements for higher data rate services are leading to the need for more advanced mobile communication systems.

[0003] Next-generation mobile communication systems need to meet, for example, handling the explosive growth of data traffic, significantly increasing 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. For this purpose, various research works 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] Rel-18 MIMO SRS enhancement supports multiple TRPs (e.g., 4 TRPs) for use in coordinated joint transmission (CJT). As the number of TRPs increases (antenna switching for DL CSI acquisition), SRS transmission increases. In order to enhance the SRS interference randomization capability in the face of the increase in SRS transmission, it is agreed to support hopping operation for comb offset values and cyclic shift values. SUMMARY

[0005] TECHNICAL PROBLEM

[0006] When the above-described comb offset hopping / cyclic shift hopping is configured in an SRS resource configured with at least one of repetition frequency hopping and / or sequence group or sequence hopping, there can be ambiguity in an initialization period for returning to the origin after completing the comb offset hopping / cyclic shift hopping. As a specific example, there can be ambiguity in whether the initialization period is defined as a fixed value regardless of repetition / frequency hopping or is determined / defined as a value associated with repetition / frequency hopping.

[0007] An object of the disclosure is to propose a method for solving the above-described problem.

[0008] The technical objects to be achieved by the disclosure are not limited to those described above merely by way of example, and other technical objects not mentioned herein will become apparent to those skilled in the art from the following description.

[0009] TECHNICAL SOLUTION

[0010] A method performed by a user equipment (UE) in a wireless communication system according to an embodiment of the disclosure includes receiving configuration information related to a sounding reference signal (SRS), and transmitting the SRS based on an SRS resource.

[0011] The configuration information includes information for the SRS resource. A comb offset hopping and / or a cyclic shift hopping is configured for the SRS resource. An initialization related to the comb offset hopping and / or the cyclic shift hopping is performed based on a period.

[0012] The period is determined based on at least one of i) a configuration value, ii) a repetition factor related to the SRS, iii) a value related to a frequency hopping, and / or iv) a time slot related to the SRS.

[0013] The configuration value can be a value in units of a radio frame, a time slot, or a symbol.

[0014] The period can be determined as a product of the repetition factor and the value related to the frequency hopping.

[0015] A hopping pattern related to the comb offset hopping and / or the cyclic shift hopping can be based on a pseudo-random sequence.

[0016] The initialization can be related to the pseudo-random sequence. The period can be related to a start of the radio frame.

[0017] The hopping pattern can be determined based on a symbol index of a first symbol repeated according to the repetition factor.

[0018] The symbol index of the first symbol can be determined based on determined, is determined based on a symbol number of a number of symbols configured in the SRS resource, R is the repetition factor, and is a floor function.

[0019] The repetition factor can be greater than 1.

[0020] The method further includes receiving information related to the period.

[0021] A factor related to the determination of the period can be indicated based on the information related to the period.

[0022] The factor can be i) a value in units of a radio frame, a time slot, or a symbol, ii) the repetition factor, iii) the value related to the frequency hopping, iv) a product of the repetition factor and the value related to the frequency hopping, or v) a time slot related to the SRS.

[0023] A user equipment (UE) operating in wireless communication according to another embodiment of the disclosure includes one or more transceivers, one or more processors, and one or more memories connected to the one or more processors and storing instructions.

[0024] The instructions, based on execution by the one or more processors, configure the one or more processors to perform all the steps of any of the methods.

[0025] An apparatus according to another embodiment of the disclosure includes one or more memories and one or more processors operatively connected to the one or more memories.

[0026] The one or more memories are configured to store instructions based on execution by the one or more processors, and the instructions are configured to allow the one or more processors to perform all the steps of any of the methods.

[0027] One or more non-transitory computer-readable media according to another embodiment of the disclosure store instructions. The instructions, executable by one or more processors, are configured to allow the one or more processors to perform all the steps of any of the methods.

[0028] A method performed by a base station in a wireless communication system according to another embodiment of the disclosure includes transmitting configuration information related to a sounding reference signal (SRS) and receiving the SRS based on an SRS resource.

[0029] The configuration information includes information for the SRS resource. A comb offset hopping and / or a cyclic shift hopping are configured for the SRS resource. An initialization related to the comb offset hopping and / or the cyclic shift hopping is performed based on a period.

[0030] The period is determined based on at least one of i) a configuration value, ii) a repetition factor related to the SRS, iii) a value related to a frequency hopping, and / or iv) a slot related to the SRS.

[0031] A base station operating in wireless communication according to another embodiment of the disclosure includes one or more transceivers, one or more processors, and one or more memories connected to the one or more processors and storing instructions.

[0032] The instructions, based on execution by the one or more processors, are configured to allow the one or more processors to perform all the steps of any of the methods.

[0033] Advantageous effects

[0034] According to embodiments of the disclosure, the initialization related to the comb offset hopping and / or the cyclic shift hopping is performed based on at least one of i) a configured radio frame unit periodicity, ii) a repetition factor related to the SRS, and / or iii) a value related to the frequency hopping.

[0035] The criteria of the comb offset hopping / cyclic shift hopping are clearly defined. When the comb offset hopping / cyclic shift hopping is configured in the SRS resource in association with the repetition / frequency hopping, the ambiguity on the UE operation related to the initialization of the comb offset hopping / cyclic shift hopping can be resolved.

[0036] In addition, the comb offset hopping / cyclic shift hopping can be initialized according to the completion of the repetition and / or the frequency hopping. Compared to the case where the initialization of each of the comb offset hopping, the cyclic shift hopping, and the frequency hopping is performed based on various time points / periods, the implementation complexity can be reduced.

[0037] Effects obtainable from the present disclosure are not limited to what has been described herein above, and other advantages unmentioned herein will become apparent to those skilled in the art upon consideration of the following description. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a flowchart illustrating an example of a UL BM procedure using SRS.

[0039] Figure 2 Examples of a transmission / reception method for using reliability enhancement of transmission in multiple TRPs are exemplified.

[0040] Figure 3 is a diagram exemplifying flexible aperiodic SRS transmission timing control.

[0041] Figure 4 is a diagram exemplifying partial band SRS transmission.

[0042] Figure 5 is a flowchart for describing a method performed by a user equipment according to an embodiment of the present disclosure.

[0043] Figure 6 is a flowchart for describing a method performed by a BS according to another embodiment of the present disclosure.

[0044] Figure 7 is a diagram exemplifying configurations of a first device and a second device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0045] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The following detailed description, taken in conjunction with the drawings, is intended to describe embodiments of the present disclosure, but does not represent the only embodiments of the present disclosure. The following detailed description includes specific details to convey a thorough understanding of the present disclosure. However, those skilled in the art will readily understand that embodiments of the present disclosure can be practiced even without these details.

[0046] In some cases, to avoid conceptual ambiguity, known structures or devices may be omitted, or they may be shown in block diagram form while focusing on the core features of each structure and device.

[0047] In the following text, downlink (DL) refers to communication from a base station to a terminal, and uplink (UL) refers to communication from a terminal to a base station. In the downlink, the transmitter can be part of the base station, and the receiver can be part of the terminal. In the uplink, the transmitter can be part of the terminal, and the receiver can be part of the base station. A base station can be referred to as a first communication device, and a terminal can be referred to as a second communication device. The term base station (BS) can be replaced by terms including fixed station, Node B, evolved Node B (eNB), next-generation Node B (gNB), base transceiver system (BTS), access point (AP), network (5G network), AI system, roadside unit (RSU), vehicle, robot, unmanned aerial vehicle (UAV), augmented reality (AR) device, virtual reality (VR) device, etc. Furthermore, the terminal can be fixed or mobile, and can 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.

[0048] SRS related operations

[0049] The UE can be configured (via higher-layer signaling, RRC signaling, etc.) with one or more Sounding Reference Symbol (SRS) resource sets configured by the (higher-layer parameter) SRS-ResourceSet. For each SRS resource set, the UE can be configured with K (≥1) SRS resources (higher-layer parameter SRS-resources). Here, K is a natural number, and the maximum value of K is indicated by SRS_capability.

[0050] Figure 1 This is a flowchart illustrating an example of a UL BM process using SRS.

[0051] - The UE receives RRC signaling (e.g., SRS-Config IE) including usage parameters from the BS (S110). As an example, the usage parameters can be configured as "beam management", "codebook", "non-codebook", or "antenna switching".

[0052] Table 1 shows an example of an SRS-Config Information Element (IE), which is used for SRS transport configuration. An SRS-Config IE includes a list of SRS resources and a list of SRS resource sets. Each SRS resource set refers to a collection of SRS resources.

[0053] The network can use a configured aperiodicSRS-ResourceTrigger (L1 DCI) to trigger the transmission of SRS resource sets.

[0054] [Table 1]

[0055]

[0056] In Table 1, "Purpose" refers to a higher-layer parameter indicating whether the SRS resource set is used for beam management or for codebook-based or non-codebook-based transmission. "SpatialRelationInfo" is a configuration parameter representing 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 purpose is configured according to the SRS resource set.

[0057] In S120, the UE determines the transmit (Tx) beam for the SRS resource to be transmitted based on the SRS-SpatialRelationInfo contained in the SRS-Config IE. The SRS-SpatialRelationInfo is configured per SRS resource and indicates whether the same beam used for SSB, CSI-RS, or SRS is applied per SRS resource. Furthermore, SRS-SpatialRelationInfo can be configured or not configured in each SRS resource.

[0058] - If SRS-SpatialRelationInfo is configured in the SRS resource, the same beam used for SSB, CSI-RS, or SRS will be applied to the transmission. However, if SRS-SpatialRelationInfo is not configured in the SRS resource, in S130, the UE randomly determines the transmission beam and transmits SRS via the determined transmission beam.

[0059] - Additionally, the UE may or may not receive feedback about the SRS from the BS (S140).

[0060] At least one of the above-described UE / BS operations based on S110 to S140 can be applied in conjunction with implementations related to the Rel-18SRS enhancements described below (e.g., at least one of Proposal 1, Proposal 2, Proposal 2-1, Proposal 2-2, Proposal 2-3, Proposal 2-4 and / or Proposal 2-5).

[0061] In the following sections, we will examine M-TRP-related operations in which the methods proposed in this disclosure can be applied.

[0062] Multi-transmission / reception point (TRP) related operations

[0063] The BS described in this disclosure can be a general term for the object that performs data transmission and reception with respect to the UE. For example, the BS described in this disclosure can be a concept that includes one or more transmission points (TPs), one or more transmission and reception points (TRPs), etc. For example, multiple TPs and / or multiple TRPs described herein can be included in a single BS, or can be included in multiple BSs. In addition, TPs and / or TRPs can include the BS's panels, transmission and reception units, etc.

[0064] Figure 2 An example of a send / receive method for improving reliability when using transmissions in multiple TRPs is illustrated.

[0065] Figure 2The example in (a) shows that layer groups sending the same codeword (CW) / transmission block (TB) correspond to different TRPs. That is, the same CW can be sent through different layers / layer groups. Figure 2 The example in (b) illustrates how different CWs can be sent through layer groups corresponding to different TRPs. That is, different CWs can be sent through different layers / layer groups.

[0066] <MTRP URLLC related operations>

[0067] In the methods presented in this disclosure, DL MTRP-URLLC means that multiple TRPs transmit the same data / DCI using different tier / time / frequency resources. UL MTRP-URLLC means that multiple TRPs receive the same data / UCI from a UE using different tier / time / frequency resources.

[0068] When a UE uses (maps) a specific TCI state (or TCI) to receive data / DCI for a certain frequency / time / space resource, it can mean that the UE uses the QCL type and QCLRS indicated by the TCI state to estimate the channel from the DMRS in the frequency / time / space resource, and uses the estimated channel to receive / demodulate data / DCI.

[0069] When a UE uses (maps) a specific TCI state (or TCI) to receive data / UCI for a certain frequency / time / space resource, it can mean that the UE uses the Tx beam and / or Tx power indicated by the TCI state to estimate the channel from the DMRS in the frequency / time / space resource, and uses the estimated channel to transmit / modulate the DMRS and data / UCI.

[0070] The UL TCI status includes the UE's Tx beam and / or Tx power information. The UL TCI status can be indicated directly via the UL-authorized DCI. The UL TCI status can also be based on the srs-UL-TCI-State (TCI-UL-State Id) configured in the SRS resource indicated by the SRI field of the UL-authorized DCI.

[0071] The UL TCI status may include information associated with one or more power control parameters. One or more power control parameters may be related to at least one of i) p0, ii) alpha, iii) closed-loop index and / or iv) pathlossReferenceRS.

[0072] In this disclosure, different TRPs can be identified as different TCI states for the UE. The case where the UE sends data / UCI (or receives data / DCI) based on TCI state 1 means that the UE sends data / UCI to TRP1 (or receives data / DCI from TRP1).

[0073] SRS enhancements in Rel-17 MIMO

[0074] In NR TDD systems, the importance of UE SRS transmission for ensuring UL and DL channel estimation performance has increased. Therefore, standardization was implemented in Rel-17 MIMO with the following three objectives:

[0075] First, the goal of standardization is to control aperiodic SRS transmission more flexibly based on the DL and UL timeslot ratios and traffic conditions of various TDD systems.

[0076] Second, NR UEs supporting DL rank 8 transmission must be equipped with at least 8 receive antennas, but the SRS antenna-changing transmission technique used in NR TDD systems for estimating DL channels based on channel reciprocity only supports UEs with up to 4 receive antennas. Therefore, the goal of standardizing Rel-17 is to support SRS antenna-changing transmission techniques for UEs equipped with more than 4 receive antennas.

[0077] Third, the purpose of implementing standardization is to increase the transmission coverage and capacity of SRS in order to accommodate the simultaneous access of multiple UEs.

[0078] More flexible aperiodic SRS transmission triggering techniques

[0079] Figure 3 This is a diagram illustrating flexible, non-periodic SRS transmission timing control.

[0080] In Rel-17 MIMO, the following two technologies were standardized to allow for more flexible control of aperiodic SRS transmission based on the DL and UL timeslot ratios and traffic conditions of various TDD systems.

[0081] First, a technique is introduced to dynamically control the slot offset value used for triggering aperiodic SRS transmissions via DCI. This is to address the problem that SRS transmissions may be significantly delayed due to the semi-persistent fixed nature of existing slot offset values, which depends on the DL and UL slot configurations.

[0082] To this end, a new DCI field is defined, which specifies one of several slot offset values ​​set in the RRC message. Furthermore, the slot offset value indicated by the DCI field is standardized to be calculated based on available slots defined as slots consisting of uplink slots and flexible symbols, thereby enabling flexible SRS transmission triggering with a smaller number of slot offset candidate values.

[0083] Secondly, a technique is introduced to trigger aperiodic SRS transmissions without accompanying UL data transmission and CSI reports. Under existing schemes, SRS transmissions can only be triggered via UL DCI when the PUSCH is allocated to trigger UL data and / or CSI reports. When there is no UL data to send and aperiodic CSI reports are not required, it is difficult for the BS to estimate the UL / DL channel by triggering SRS for the UE. This technique aims to address the aforementioned problem.

[0084] SRS antenna switching transmission for UEs equipped with more than 4 receive antennas

[0085] As mentioned above, the SRS antenna-changing transmission technique supported in Rel-15 / 16 NR systems only considers UEs equipped with 4 receive antennas. In Rel-17 MIMO, the SRS antenna-changing transmission method for UEs equipped with 6 and 8 receive antennas has been standardized. The extended antenna-changing transmission method supports the following combinations of Nt transmit antennas and Nr receive antennas.

[0086] UEs with Nr = 6: Nt = 1 and Nt = 2, and UEs with Nr = 8: Nt = 1, Nt = 2 and Nt = 4.

[0087] The aforementioned SRS transmission can be sent within one time slot, or across two or four time slots.

[0088] SRS coverage and capacity enhancement techniques

[0089] Figure 4 This is a diagram illustrating SRS transmission in a portion of the frequency band.

[0090] To increase the coverage and capacity of SRS in Rel-17 MIMO, three main technologies were introduced.

[0091] First, the maximum number of SRS transmission repetitions was increased to allow SRS to be used in systems requiring wider coverage. In Rel-15 and Rel-16, SRS could be retransmitted for up to four symbols within a time slot, except for positioning purposes. In Rel-17 MIMO, to ensure wider SRS coverage, SRS could be retransmitted for up to 14 symbols within a time slot. Specifically, SRS could be transmitted in 8, 10, 12, or 14 consecutive symbols within a time slot.

[0092] Secondly, SRS can be transmitted only in a portion of the frequency band. To this end, the base station can configure the resource block location and SRS transmission frequency band for the UE to initiate SRS transmission. For SRS transmission, the frequency location can also be changed or fixed according to a set rule based on the SRS frequency hopping period. The introduction of this technology increases SRS capacity by allowing different UEs to simultaneously transmit SRS to the same BS in different portions of the frequency band.

[0093] Finally, SRS with lower frequency density is supported. Besides the positioning in Rel-15 / 16, the supported SRS frequency density is either 2 REs + 1 RE or 4 REs + 1 RE. Therefore, stable channel estimation performance can be ensured in frequency-selective channel environments, but there are limitations in ensuring SRS capacity. Therefore, in Rel-17 MIMO, an additional transmission technique is introduced to transmit SRS at 8 REs + 1 RE, thereby further increasing SRS capacity in frequency-non-selective channel environments.

[0094] The following section will present the BS SRS configuration method (considering C-JT M-TRP transmission) and subsequent UE SRS transmission operations.

[0095] In NR Rel-15 MIMO, SRS can be used for UL link adaptation (codebook / non-codebook), beam management, and DL CSI acquisition (antenna switching). In Rel-17 FeMIMO, as mentioned above, standardization has been implemented to support / introduce the following operations / configurations to enhance the coverage and capacity of SRS.

[0096] i) Increase the number of repetitions

[0097] ii) RPFS (RB-level partial frequency detection) configuration

[0098] iii) Comb value 8 configuration

[0099] In Rel-18, the SRS Enhancement and Coherent Joint Transmission (C-JT) scenario is considered to support PUSCH based on up to 8 layers (up to 8 layers PUSCH). According to this scenario, the SRS transmission frequency can be increased depending on the TRP combination in the SRS used for DL ​​CSI acquisition. With this in mind, the operation / configuration of enhanced SRS capacity and interference randomization is being considered.

[0100] Table 2 below illustrates the technical requirements for the above SRS enhancement considerations.

[0101] [Table 2]

[0102]

[0103] Specifically, this disclosure proposes a method to enhance SRS capacity and interference randomization by taking into account C-JT M-TRP transmission. First, the deficiencies / problems of existing conventional SRS configurations are described in Problems 1 and 2, and then the proposed techniques for addressing them are described in Proposal 1 and Proposal 2.

[0104] In this disclosure, depending on the context, " / " means "and", "or", or "and / or".

[0105] Question 1: As shown in Table 2 above, there are several constraints in Rel-18 SRS enhancements, one of which is that the content of additional resources used for SRS is not considered. This is to minimize the implementation complexity of the UE / BS by limiting the configuration of additional SRS resources used for SRS enhancements.

[0106] Furthermore, the antenna switching SRS configuration for a given UE is currently limited to a maximum of one SRS resource set configuration (excluding configurations for each time-domain behavior). In other words, the SRS resource set configured for antenna switching is limited to one.

[0107] The following describes the implementation methods used to solve the problem.

[0108] Specifically, a method for performing probes against multiple DL TRPs (for DL ​​CSI acquisition) based on limited SRS resources is described below in Proposal 1.

[0109] Suggestion 1

[0110] For SRS resources within a specific SRS resource set, multiple (up to 4) spatialRelationInfo / (joint or individual UL) TCIs can be configured / indicated. The purpose of a specific SRS resource set can be set for antenna switching, beam management, codebook, or non-codebook.

[0111] In the following text, "spatialRelationInfo / TCI" can refer to the high-level parameter spatialRelationInfo or the high-level parameter TCI state. SpatialRelationInfo relates to the configuration of the spatial relationship between the target SRS and the reference SRS. The TCI state can be based on a single TCI state (UL TCI state) or a joint TCI state. The UL TCI state can be indicated based on TCI-UL-StateId, and the joint TCI state can be indicated based on TCI-StateId.

[0112] As an example, multiple spatialRelationInfo parameters can be configured separately in SRS resources within a specific SRS resource set.

[0113] As an example, multiple joint TCI states can be configured in SRS resources within a specific SRS resource set (e.g., TCI states configured based on dl-OrJointTCI-StateList in PDSCH-Config).

[0114] As an example, multiple individual TCI states can be configured in SRS resources within a specific SRS resource set (e.g., UL TCI states configured based on ul-TCI-StateList within BWPUplinkDedicated).

[0115] For periodic / semi-persistent SRS resource sets, the UE cyclically transmits multiple spatialRelationInfo / TCIs ​​configured for each transport instance of the SRS resource (set). Here, the cyclical transmission of spatialRelationInfo / TCIs ​​can mean that the UE performs SRS transports while changing the spatialRelationInfo / TCIs. As an example, the transport instance can be based on the period associated with the SRS transport. The period and slot offset for resourceType semi-persistent or periodic SRS resources can be set via the higher-level parameter periodicityAndOffset.

[0116] For example, a cyclic operation can be performed as follows: Assume SRS resources #1 and #2 are configured in SRS resource set #1, with a transmission period of 4 time slots, and 2 spatialRelationInfo / TCIs ​​configured in each resource. When transmitting SRS resources #1 and #2 in time slot #0, the UE can transmit SRS resources #1 and #2 based on spatialRelationInfo / TCI #1. When transmitting SRS resources #1 and #2 in time slot #4, the UE can transmit SRS resources #1 and #2 based on spatialRelationInfo / TCI #2.

[0117] Here, SRS resource transmission or SRS resource set transmission can refer to SRS being sent on SRS resources or SRS resources of an SRS resource set.

[0118] The cyclic order of spatialRelationInfo / TCI for each SRS transmission instance can follow the order configured in each resource (set). Even in the case of non-periodic SRS resource sets, the UE can perform probes for multiple TRPs in the same manner as P / SP (periodic SRS / semi-persistent SRS) (cyclically for each trigger / transmission instance).

[0119] For example, a loop of spatialRelationInfo / TCI can be executed for each instance that triggers the corresponding SRS resource set and sends it via DCI.

[0120] As another example, for the corresponding AP SRS resource set (i.e., the SRS resource set configured as non-periodic), a cyclic operation based on i) or ii) can be performed.

[0121] i) The UE can transmit SRS by cycling spatialRelationInfo / TCI in consecutive (available UL) time slots, starting from the time slot offset configured in the SRS resource set, equal to the number of spatial Relation Info / TCIs ​​set in the SRS resources within the SRS resource set (or / and the corresponding number N (natural number) times). The time slot offset can mean the offset of the number of time slots between the triggering DCI and the actual transmission of that SRS-ResourceSet.

[0122] As an example, the UE can receive a DCI that triggers SRS in time slot n. The time slot offset configured in the SRS resource set associated with the SRS can be k (e.g., 1 to 32). Two spatialRelationInfo / TCIs ​​can be configured in two SRS resources in the SRS resource set, respectively. The UE can transmit SRS by cycling through two spatialRelationInfo / TCIs ​​in consecutive UL time slots, including time slot n+k as the first time slot.

[0123] (ii) (In addition to the slot offset set in the SRS resource set), the number of repeated transmissions and / or transmission period (e.g., slot X) can be set for the SRS resources in the SRS resource set. When the corresponding AP SRS resource set is triggered, the corresponding SRS resource set can be sent in multiple slots by cyclically using spatialRelationInfo / TCI.

[0124] The number of repeated transmissions in method ii above can be N times the number of spatialRelationInfo / TCIs ​​set / indicated (N is a natural number). As another (or equivalent) example, different TRP IDs or their corresponding different spatialRelationInfo / TCIs ​​can be configured to be implicitly pre-connected / associated for each time slot. For example, time slots 4n / 4n+1 / 4n+2 / 4n+3 can be connected to TRP#0 / 1 / 2 / 3 and associated with TRP#0 / 1 / 2 / 3 respectively. When an AP SRS transmission triggering DCI is received, the UE can determine the SRS transmission time slot by applying a time slot offset based on the time of DCI reception (indicated by DCI or set in the APSRS resource set). The UE can operate to generate / transmit SRS based on the TRPID connected to the corresponding SRS transmission time slot or its corresponding spatialRelationInfo / TCI.

[0125] Alternatively / and, the BS can use a separate field (up to 2 bits) of the SRS that triggers the DL / UL DCI to indicate the spatialRelationInfo / TCI used for SRS transmission. Specifically, based on this field, it can be indicated which of the multiple (up to 4) spatialRelationInfo / TCIs ​​configured for each SRS resource will be used for aperiodic SRS (resource set) transmission. As a concrete example, the spatialRelationInfo / TCI to be used can be determined based on the field's value (code point). With code point = "00", the spatialRelationInfo / TCI set for the SRS resource configured in the SRS resource set can be used for SRS transmission. With code point = "10", a second spatialRelationInfo / TCI set for the SRS resource configured in the SRS resource set can be used for SRS transmission.

[0126] In addition, multiple SRS transmissions can be triggered by instructing multiple spatialRelationInfo / TCIs ​​through DL / UL authorized DCI.

[0127] For example, when scheduling repeated PUSCH in M-TRP using UL-authorized DCI, two SRI fields can be used to indicate two SRIs. By enhancing this, the following actions can be performed: Two SRS resources (or / and the two SRS resource sets to which the two SRS resources belong) can be triggered based on the two SRIs indicated above.

[0128] When two SRS resources (or / and the two SRS resource sets to which the two SRS resources belong) are triggered and transmitted, two spatialRelationInfo / TCIs ​​based on the two indicated SRIs can be used for transmission. In this case, when two SRIs are indicated via DCI, a separate 1-bit field may exist within the DCI to indicate whether the two indicated SRS resources (sets) are triggered. The slot offset for each SRS resource set (within the two SRS resource sets based on the two indicated SRS resources) can also be preset / indicated.

[0129] As another example, an M-TRP PUSCH can be scheduled via a UL-authorized DCI that schedules a repeating M-TRP PUSCH, and the SRS resource set of the M-TRP target can be triggered via the SRS request field in the DCI. In this case, the value (code point) of the SRS request field can be set to the value (code point) of multiple SRS resource sets to be joined / mapped.

[0130] In particular, in this scenario, as in the first example above, when transmitting an SRS resource set, probing can be performed by utilizing the two spatialRelationInfo / TCIs ​​used in the two SRI indications. Specifically, the following operations can be performed based on the two SRS resource sets indicated by the code points in the SRS request field. The UE can use the transmission beam (e.g., a UL TX spatial filter) corresponding to the first SRI for the first SRS resource set and the transmission beam corresponding to the second SRI for the second SRS resource set.

[0131] As another example, dynamic updates to multiple TCI states for M-TRP can be performed using DL-licensed / unlicensed DCIs. In this case, the UE can apply the multiple TCIs indicated by the DCI to the SRS resource set for the M-TRP target indicated in the SRS Request field. Specifically, the following operations can be performed based on two SRS resource sets indicated by the code points in the SRS Request field: The UE can use the transmission beam (e.g., a UL TX spatial filter) corresponding to the first TCI for the first SRS resource set and the transmission beam corresponding to the second TCI for the second SRS resource set.

[0132] The operation proposed in Proposal 1 can be applied in relation to the operations described above. Specifically, based on the fact that multiple spatialRelationInfo / TCIs ​​have been indicated and a target SRS resource set has been triggered, the following operation can be performed: The UE can send SRS by looping through multiple spatialRelationInfo / TCIs ​​for the SRS resources within the corresponding SRS resource set, as in Proposal 1.

[0133] By implementing Proposal 1, in a combination of multiple TRPs in an M-TRP (C-JT) DL transport, a single SRS resource set can be used to perform probing of multiple TRPs (for DL ​​CSI acquisition) without additional SRS resource configuration.

[0134] In addition, just as multiple spatialRelationInfo / TCIs ​​can be configured for each SRS resource in the SRS resource set, multiple sets of SRS power control parameters can be configured (as many as the number of spatialRelationInfo / TCIs ​​in the SRS resource set).

[0135] The UE can apply the spatialRelationInfo / TCI cyclic operation based on Proposal 1 above to multiple SRS power control parameter sets configured in the SRS resource set. Specifically, the UE can determine the transmission power by cyclically cycling through multiple SRS power control parameter sets for each transmission instance of the SRS resource set, thereby transmitting SRS.

[0136] The cyclic order of multiple power control parameter sets can follow the order in which they are configured in the SRS resource set.

[0137] When the UE supports Rel-17 Unified TCI configured / associated with power control parameters, the power control parameter set can be cycled as follows. Since the power control parameter set is set in multiple TCI states (joint or individual ULs) configured in the SRS resources within the corresponding SRS resource set, the power control parameter set can cycle concurrently with the TCI cycle.

[0138] The MAC CE format related to the above implementation will be examined below.

[0139] Specifically, when multiple spatialRelationInfo / TCIs ​​are configured in the SRS resources of the SRS resource set as described above, a MAC CE format for dynamically updating / activating multiple spatialRelationInfo / TCIs ​​is proposed.

[0140] The MAC CE format may include multiple spatialRelationInfo / TCIs ​​for each SRS resource in the target SRS resource set. As an example, the MAC CE format may include at least one field representing / indicating multiple spatialRelationInfo / TCIs ​​for each SRS resource in the target SRS resource set.

[0141] When the SRS resource set is a periodic component resource set (i.e., resourceType is set to periodic SRS resource set), it is not possible to update / activate the spatialRelationInfo / TCI set via MAC CE based on RRC signaling. In this regard, the following implementation method can be considered.

[0142] For SRS resources within a periodic component SRS resource set, the spatialRelationInfo / TCI used for cyclic transmission can be configured based on RRC signaling. Specifically, multiple reference RS candidates for spatialRelationInfo / TCI can be configured for each SRS resource. As an example, when considering up to four TRPs, the spatialRelationInfo / TCI for each SRS resource can be configured as follows.

[0143] 1) Multiple candidates related to the first spatialRelationInfo / TCI

[0144] 2) Multiple candidates related to the second spatialRelationInfo / TCI

[0145] 3) Multiple candidates related to the third spatialRelationInfo / TCI

[0146] 4) Multiple candidates related to the fourth spatialRelationInfo / TCI

[0147] SpatialRelationInfo / TCI, based on multiple candidates, can be correlated with different reference RSs.

[0148] The operation based on the implementation described below will be described in more detail below.

[0149] One of the configured candidate spatialRelationInfo / TCIs ​​can be indicated based on the enhanced SRS spatialRelationInfo / TCI update / activation MAC CE (format). Specifically, one of the candidate spatialRelationInfo / TCIs ​​configured by RRC (for the first to fourth spatialRelationInfo / TCIs ​​in the cyclic transmission) can be indicated for the spatialRelationInfo / TCI update / activation of the SRS resource set of the periodic component. When assuming that even if the second spatialRelationInfo / TCI is indicated, the spatialRelationInfo / TCI can be indicated as follows. Based on the MAC CE, i) one of the multiple candidates associated with the first spatialRelationInfo / TCI and one of the multiple candidates associated with the second spatialRelationInfo / TCI can be indicated.

[0150] As mentioned above, based on MAC CE, the UE can perform updates / activations for the corresponding P-SRS.

[0151] When multiple candidate spatialRelationInfo / TCIs ​​(for the first to fourth spatialRelationInfo / TCIs ​​in a cyclic transmission) are configured for an SRS resource set, the following problem may occur in UE operation. When a P-SRS transmission is performed before indicating the first MACCE, there is ambiguity in UE operation regarding which of the multiple candidate spatialRelationInfo / TCIs ​​should be used for the corresponding SRS transmission. To resolve this issue, the following implementation method can be considered.

[0152] The UE uses the first spatialRelationInfo / TCI with the lowest ID and / or the reference RS and / or TCI state for the corresponding SRS transmission. The case of utilizing two spatialRelationInfo / TCIs ​​is assumed and described.

[0153] As an example, i) the spatialRelationInfo / TCI with the lowest ID among the multiple candidates associated with the first spatialRelationInfo / TCI and associated with the reference RS, and ii) the spatialRelationInfo / TCI with the lowest ID among the multiple candidates associated with the second spatialRelationInfo / TCI and associated with the reference RS, can be used for SRS transmission.

[0154] As an example, i) the spatialRelationInfo / TCI with the lowest ID among the multiple candidates associated with the first spatialRelationInfo / TCI, and ii) the spatialRelationInfo / TCI with the lowest ID among the multiple candidates associated with the second spatialRelationInfo / TCI, can be used for SRS transmission. The spatialRelationInfo / TCI with the lowest ID can be either the TCI state with the lowest ID (i.e., the lowest tci-StateId) or the first spatialRelationInfo among the multiple candidates.

[0155] The MAC CE format, used to update / activate multiple power control parameter sets, can be used for a specific SRS resource set.

[0156] When the BS configures / instructs a change to the spatialRelationInfo / TCI for an SRS resource within a specific SRS resource set, the UE can begin changing the spatialRelationInfo / TCI as early as 3 milliseconds after sending an ACK for the change configuration / instruction (e.g., MAC-CE). This reduces ambiguity regarding the timing of the spatialRelationInfo / TCI change and allows the UE to perform the change operation with a clear timeline.

[0157] When the spatialRelationInfo / TCI changes for an SRS resource in an SRS resource set, the UE can perform probing by looping from the first spatialRelationInfo / TCI set after the timeline (e.g., first -> second -> third -> fourth -> first...).

[0158] Additionally, considering the presence of a primary service TRP, a method can be considered where, instead of cycling multiple spatialRelationInfo / TCIs ​​at the same rate for each SRS resource in the SRS resource set, additional frequencies are allocated to the primary (most frequently used) target service TRP and cycled. For example, when four spatialRelationInfo / TCIs ​​cycle at the same ratio (1:1:1), each spatialRelationInfo / TCI can be used and changed only once. However, according to implementations, when each spatialRelationInfo / TCI has a different frequency, the spatialRelationInfo / TCIs ​​can be cycled based on a ratio (e.g., 2:1:1:1). In this case, depending on the ratio (e.g., 2:2:1), a particular spatialRelationInfo / TCI can be used twice and then changed to another spatialRelationInfo / TCI.

[0159] Or / and, when there are TRPs with insufficient coverage, a method can be considered whereby the symbol count / repetition factor of the SRS resources in the corresponding SRS resource set is increased for each target TRP (for each Tx instance) (for the TRP with insufficient coverage). That is, when transmitting SRS resources in the SRS resource set with a specific spatialRelationInfo / TCI, the UE can perform probing (transmitting SRS) based on a value greater than the set symbol count / repetition factor (e.g., 1 or 2) (e.g., 2 or 4).

[0160] Question 2: For SRS interference randomization between TRPs, time-domain / frequency-domain / code-domain dispersion is required in multi-UE / TRP SRS configurations. As shown in Table 2 above, constraints exist in Rel-18 SRS enhancements, such as the need to use the existing SRS comb structure because it is introducing or not introducing new SRS root sequences. As a result, the introduction of slot / symbol-level comb value transitions, cyclic shift transitions, and additional frequency transition patterns is being discussed at standardization meetings.

[0161] Proposal 2 proposes a method for configuring / indicating specific sequence (group) transitions, frequency transition patterns, comb value transition patterns, and cyclic shift transition patterns for TRP.

[0162] Suggestion 2

[0163] For UE SRS transmission (for antenna switching purposes), the BS can configure / instruct at least one of the following 1) to 8) differently for SRS with different expected / target TRPs.

[0164] 1) Sequence initialization factor

[0165] 2) Sequence (group) jump patterns

[0166] 3) Frequency jump pattern

[0167] 4) RB-level Partial Frequency Detection (RPFS) Pattern

[0168] 5) Comb value

[0169] 6) Comb value jump pattern

[0170] 7) Circular shift

[0171] 8) Cyclic shift jump pattern

[0172] As mentioned above, SRS with different expected / target TRPs can be SRS configured / indicating different UL spatialRelationInfo / TCIs ​​for a specific SRS and / or multiple SRSs.

[0173] For example, as in Proposal 1 above, it can be assumed that multiple spatialRelationInfo / TCIs ​​are configured for each SRS resource in a specific SRS resource set. In this case, different SRS transmission instances sent based on different spatialRelationInfo / TCIs ​​(i.e., based on SRSs of different SRS transmission instances) can be SRSs pointing to different TRPs.

[0174] In other words, in Proposal 1, at least one of the following can be configured / indicated differently for each different SRS transmission instance: 1) Sequence initialization factor, 2) Sequence (group) transition pattern, 3) Frequency transition pattern, 4) RPFS pattern, 5) Comb value, 6) Comb value transition pattern, 7) Cyclic shift and / or 8) Cyclic shift transition pattern.

[0175] Or / and, when a target TRP(id) is explicitly configured for an SRS resource(set), where an SRS resource(set) with a different target TRP(id) can be an SRS with a different expected / target TRP.

[0176] Proposal 2-1

[0177] The methods for configuring / indicating TRP-specific sequence initialization factors and / or TRP-specific sequence (group) transition patterns for each SRS will be examined below.

[0178] As shown in Table 3 below, in the NR SRS configuration, the sequence group u and sequence number v are determined by the groupOrSequenceHopping parameter. The SRS sequence initialization factor and corresponding value for (sequenceId) can be set for each SRS resource. For a specific SRS resource, whether to perform sequence group transitions and sequence transitions is determined by the on / off states of u and v. The SRS sequence determined by the sequenceId configured in the corresponding SRS resource can vary for each slot / symbol index.

[0179] [Table 3]

[0180]

[0181] According to Proposal 2-1, different sequence initialization factors and / or sequence (group) transition patterns can be configured / indicated for SRS resources (sets) with different expected / target TRPs.

[0182] For sequence group index u, the value of u can be set to vary between different SRS with different expected / target TRPs based on the following i) and / or ii).

[0183] i) Set the following equation 1 for each desired / target TRP (differently). (sequenceId) value

[0184] ii) Configured only in TRP#0 (e.g., the first SRS resource (set) transport and / or the first SRS transport instance in the proposal), and by using TRP IDs (e.g., between different desired / target TRPs in proposal 1). Offset value and / or for each SRS transport instance Offset value and corresponding Add them together to configure each TRP differently. .

[0185] [Equation 1]

[0186]

[0187] According to the implementation method, the u value can be changed between different SRS with different expected / target TRPs by modifying / applying Equation 2 below.

[0188] Equation 2 can be used to determine the existing The formula for calculating the modulus of the value can be expressed as follows: According to this implementation, in the case of SRS transmission based on multiple TRPs, Equation 2 can be applied in a modified form, such as... = (X + TRP specific offset value) mod 30 in the form of and / or = (X) mod 30 + TRP-specific offset value. In this case, the TRP-specific offset value can mean an offset value set individually / independently for each TRP ID (e.g., for each SRS in which different UL spatialRelationInfo / TCIs ​​are configured / indicated). This allows the u value to vary between different SRSs with different desired / target TRPs.

[0189] [Equation 2]

[0190]

[0191] Through the operations described in Proposal 2-1 above, the sequenceId value can be set differently, or the sequence (group) transition patterns can be configured differently for SRSs pointing to different TRPs. When multiple SRSs pointing to different TRPs (from multiple UEs) conflict in the time / frequency domain, this allows for interference randomization effects to be achieved through conflicts between orthogonal (or quasi-orthogonal) sequences.

[0192] Suggestion 2-2

[0193] The methods used to configure / indicate specific frequency transition patterns for each SRS will be examined below.

[0194] As shown in Table 4 below, in the NR SRS configuration, when configured in the higher layer... equal to or greater than At that time, frequency hopping is disabled, therefore the frequency domain index... The value is fixed, and when it is less than When frequency hopping is enabled, therefore the frequency domain index... Value based on SRS counter The change jumps due to the increase.

[0195] [Table 4]

[0196]

[0197] According to Proposal 2-2, different SRS resources (sets) with different expected / target TRPs can be set. Values ​​are used to configure / indicate different frequency transition patterns.

[0198] The following configuration can be applied when the UE sends multiple spatialRelationInfo / TCIs ​​in a cyclic manner using a specific SRS resource (set) based on Proposal 1.

[0199] By setting different values ​​for each SRS transport instance with different spatialRelationInfo / TCI The value can be configured / indicate different frequency transition patterns for each SRS transmission instance.

[0200] This implementation proposes an operation in which... The value varies depending on the cyclic / changing spatialRelationInfo / TCI in a specific SRS resource (set).

[0201] By implementing the operation of Proposal 2-2 above, frequency hopping pattern values ​​can be configured differently for SRSs pointing towards different TRPs. In this way, when multiple SRSs (from multiple UEs) pointing to different TRPs collide in the time / frequency domain, the SRSs detect different hopping frequency bands or have different hopping patterns, thus achieving interference randomization.

[0202] Suggestions 2-3

[0203] The methods for configuring / indicating TRP-specific RB-level partial frequency probes (RPFS) startRBIndex and / or EnableStartRBHopping for each SRS will be examined below.

[0204] To enhance SRS coverage / capacity in Rel-17 SRS enhancements, standardization is performed to probe 1 / 2 or 1 / 4 of the SRS bandwidth configured for enabling / disabling frequency hopping. The following configuration / operation can be performed regarding the utilization of a portion of the SRS bandwidth.

[0205] Can be set The value can be configured to configure the corresponding probe execution. The startRBIndex of which specific frequency band within a given frequency band. For example, startRBIndexAndFreqScalingFactor2 or startRBIndexAndFreqScalingFactor4 can be configured based on partialFreqSounding. The frequency scaling factor can be configured based on startRBIndexAndFreqScalingFactor2. The starting RB index is 2. The frequency scaling factor can be configured based on startRBIndexAndFreqScalingFactor4. The starting RB index is 4.

[0206] It is possible Each frequency band is configured with EnableStartRBHopping to determine whether a hopping is performed. For example, enableStartRBHopping can be set to enabled.

[0207] For example, the initial RB transition can be performed as follows.

[0208] when When the startRBIndex is set, a jump can be performed relative to startRBIndex in the form of 0, 1, 0, 1. startRBIndex can be set to 0 or 1 (for example, startRBIndexAndFreqScalingFactor2 is set to 0 or 1).

[0209] when When the startRBIndex is 0, 2, 1, 3, 0, 2, 1, 3, it can jump relative to startRBIndex. startRBIndex can be set to 0, 1, 2, or 3 (for example, startRBIndexAndFreqScalingFactor4 is set to 0, 1, 2, or 3).

[0210] According to Proposal 2-3, different startRBIndex and / or EnableStartRBHopping can be configured / indicated for SRS resources (sets) with different expected / target TRPs. This allows for probing different partial frequency bands or configuring / indicating different start RB hopping patterns.

[0211] Specifically, even for SRS resources (sets) with different expected / target TRPs Even with the same value, different starting RB transition patterns can be configured / indicated (e.g., SRS#1 = "0, 2, 1, 3, 0, 2, 1, 3…", SRS#2 = "2, 1, 3, 0, 2, 1, 3, 0…", and SRS#3 = "0, 1, 2, 3, 0, 1, 2, 3…").

[0212] The following configuration can be applied when the UE transmits SRS by circulating multiple spatialRelationInfo / TCIs ​​using a specific SRS resource (set) based on Proposal 1.

[0213] Different startRBIndex values ​​can be configured / indicated, or different frequency hopping patterns can be configured / indicated for each SRS transmission instance with different spatialRelationInfo / TCI. This allows for probing different partial frequency bands or configuring / indicating different start RB hopping patterns for each SRS transmission instance.

[0214] This implementation proposes that the startRBIndex and / or the initial RB transition pattern vary depending on the cyclic / changing spatialRelationInfo / TCI in a particular SRS resource (set).

[0215] By implementing the operations proposed in 2-3, the initial RB transition pattern can be configured differently (in RPFS) for SRSs pointing to different TRPs. Thus, when multiple SRSs pointing to different TRPs (from multiple UEs) conflict in the time / frequency domain, the SRSs will detect different portions of the frequency band or have different initial RB transition patterns, thereby achieving interference randomization.

[0216] Suggestions 2-4

[0217] The methods for configuring / indicating TRP-specific comb values ​​and / or comb value transition patterns for each SRS will be examined below.

[0218] According to Proposal 2-4, different comb value offsets and / or comb offset value transition patterns can be configured / indicated for SRS resources (sets) with different expected / target TRPs. The methods for configuring / indicating different comb offset values ​​and / or different comb offset value transition patterns are described in detail below.

[0219] As an example, even if the comb values ​​of SRS resources (sets) with different expected / target TRPs are the same, different comb offsets can be configured / indicated in each SRS resource (set).

[0220] As an example, when comb offset transitions and / or comb value transitions are supported in SRS, the following configuration / operation can be performed: Different comb offset transition patterns and / or comb value transition patterns can be configured / indicated in SRS resources (sets) with different desired / target TRPs.

[0221] For example, when the comb value is set to 4, different comb offsets of 0 and 3 can be configured / indicated for SRS resources (sets) with different expected / target TRPs.

[0222] For example, when based on the SRS counter When increasing the number of slots / symbols to support hopping of comb offset values, the following configuration / operation can be performed. For SRS resources (sets) with different desired / target TRPs (even if the initial comb offset values ​​are the same), different hopping patterns can be configured / indicated, such as "comb offset = 0, 2, 3, 1, 0, 2, 3, 1…" and "comb offset = 0, 1, 2, 3, 0, 1, 2, 3…".

[0223] The following configuration can be applied when the UE sends SRS based on Proposal 1 by cyclically transmitting multiple spatialRelationInfo / TCIs ​​using a specific SRS resource (set).

[0224] Different comb offset values ​​can be configured / indicated, or different comb offset transition patterns can be configured / indicated for each SRS transmission instance with different spatialRelationInfo / TCI. This allows for probing different frequency resources or configuring / indicating different comb offset transition patterns for each SRS transmission instance.

[0225] This implementation proposes an operation in which the comb offset and / or comb offset jump pattern varies depending on the cyclic / changing spatialRelationInfo / TCI in a particular SRS resource (set).

[0226] By implementing the operations in Proposals 2-4 above, comb offsets and / or comb offset transition patterns can be configured differently for SRSs pointing to different TRPs. Therefore, when multiple SRSs pointing to different TRPs (from multiple UEs) conflict in the time / frequency domain, the SRSs detect different frequency resources or have different comb offset transition patterns, thus achieving interference randomization.

[0227] Suggestions 2-5

[0228] The methods used to configure / indicate TRP-specific CS values ​​and / or CS value transition patterns for each SRS will be examined below.

[0229] According to Proposal 2-5, different CS values ​​and / or CS value transition patterns can be configured / indicated for SRS resources (sets) with different expected / target TRPs. The methods for configuring / indicating different CS values ​​and / or different CS value transition patterns are described in detail below.

[0230] First, the method is described by referring to the PUCCH CS jump equation. In Equation 3 below, This can be interpreted as the CS value set in the SRS resource.

[0231] According to Proposal 2-5, the CS value can be set to vary between different SRS with different expected / target TRPs based on the following i) and / or ii).

[0232] i) Set different TRPs for each expectation / target value.

[0233] ii) Configure only in TRP#0 (e.g., the first SRS resource (set) transport and / or the first SRS transport instance in the proposal), and by matching the TRP ID (e.g., the CS offset value between different desired / target TRPs in Proposal 1 and / or the CS offset value for each SRS transport instance) with the corresponding Add them together to configure them differently for each TRP. .

[0234] [Equation 3]

[0235]

[0236] According to the implementation method, the CS value can be changed between different SRS with different expected / target TRPs by modifying / applying Equation 4 below.

[0237] Equation 4 can be used to determine The formula for calculating the value can be expressed as: .

[0238] According to the implementation method, Equation 4 can be applied to modified forms, such as... Specific CS offset value. In this context, a TRP-specific CS offset value can mean an offset value set individually / independently for each TRP ID (e.g., for each SRS configured / indicating a different UL spatialRelationInfo / TCI). Such an operation allows the CS value to vary between different SRSs with different desired / target TRPs.

[0239] [Equation 4]

[0240]

[0241] In Equation 3 above, the number of subcarriers within 1 RB in Equation 3 above ( The constants related to this can be modified in the equation based on the comb value set in the SRS. In the case of the constants related to the maximum CS value in Equation 5 above, the maximum CS value to be applied may vary depending on the comb value set in the SRS. Obviously, the above equations based on Proposals 2-5 do not limit the technical concept of this disclosure, and modifications to the equations may also be included in the technical concept of this disclosure.

[0242] Through the operations described in Proposals 2-5 above, the CS value can be configured differently, or the CS transition pattern can be configured differently for SRSs pointing to different TRPs. This allows for interference randomization effects to be achieved through the collision between orthogonal (or quasi-orthogonal) sequences when multiple SRSs pointing to different TRPs (from multiple UEs) collide in the time / frequency domain.

[0243] In Proposal 2 above, when the SRS is to be sent at an additional frequency for the primary (most commonly used) target service TRP, the following approach can be considered. By prioritizing the reduction between SRS resources (sets) pointing to the primary target service TRP (TRP#0 and TRP#1), the sequence group / CS hop distance between the two TRPs can be increased to the maximum value, and the case of including other TRPs#2 and TRP#3 can be considered secondarily.

[0244] Specifically, orthogonality can be increased for SRS pointing to the primary TRP by setting / indicating the sequence group / CS jump distance to the maximum value, and interference between primary TRPs can be reduced by locating the sequence group and / or CS values ​​of SRS pointing to the remaining TRPs between distances.

[0245] The method for randomizing SRS interference will be described below.

[0246] In Rel-18 MIMO, SRS interference can increase with the increase of C-JT TRP in SRS transmissions used for C-JT (for DL ​​CSI acquisition), and therefore, the introduction of new techniques for SRS interference randomization is discussed. Referring to the protocol below, cyclic shift (CS) transitions and / or comb-off transitions can be introduced for SRS interference randomization (for antenna switching), and further research is needed on specific transition patterns or transition units.

[0247] [Table 5]

[0248]

[0249] As mentioned in Proposals 2-5 above, it is agreed that the CS and / or comb offset transition pattern is based on a pseudo-random sequence c(i), which is based on a gold sequence (similar to the PUCCH CS transition) (see Table 6 below). Furthermore, sequence initialization is scheduled to be performed via an ID such as the cell ID, SRS ID, or C-RNTI.

[0250] [Table 6]

[0251]

[0252] Furthermore, for CS and / or comb offset jumps, it is agreed that jumps should be performed based on symbol and slot indices, similar to existing SRS sequence jumps or sequence group jumps. Additionally, operations based on repetition factors, peroccasion of an SRS resource, etc., using symbol groups for jumps can be discussed.

[0253] Question A. At least one of repetition, frequency hopping, and / or sequence groups or sequence hopping can be configured in a specific SRS resource. Furthermore, when CS and / or comb offset hopping is supported, symbol / slot index-based CS and / or comb offset hopping can be configured simultaneously with repetition / frequency hopping / sequence groups or sequence hopping configured for a specific SRS resource. The UE operation in this case needs to be defined. This is described in Proposal A.

[0254] Proposal A

[0255] The following describes UE operation when repetition / frequency hopping / sequence grouping or sequence hopping and CS and / or comb offset hopping are configured in a specific SRS resource.

[0256] When a CS and / or comb offset transition is performed based on the symbol / slot index as described in the above protocol, the CS and / or comb offset value through the transition is determined based on the (absolute) slot index in the slot. In this case, when repetitions are configured together, the SRS symbol is repeated R times, and the following UE operations i) to iii) may occur.

[0257] i) CS and / or comb offset jumps can be performed on each of the R symbols.

[0258] ii) When a frequency transition (FH) is performed together, the symbol index is incremented simultaneously with the execution of the FH, so that the CS and / or comb offset transitions can be performed together with the FH.

[0259] iii) As the symbol index increases, sequence groups or sequence jumps can also be performed together with CS and / or comb offset jumps.

[0260] "Sequence group or sequence transition" refers to a group transition or sequence transition that is enabled during a group transition or sequence transition.

[0261] The specific UE operations in cases i), ii) and iii) above will be described in detail in proposals A-1, A-2 and A-3 below, respectively.

[0262] Proposal A-1

[0263] The following describes a method for maintaining CS and / or comb offset values ​​when configuring repetition for SRS resources (e.g., repetition factor R > 1).

[0264] Proposal A-1-1

[0265] When the PUCCH CS hopping equations are widely applied to SRS CS / comb offset hopping as described in Proposal 2-5 above, Equations 5 and 6 below can be used for SRS CS / comb offset hopping. In this case, since the SRS CS or comb offset value is determined by the slot index and the (absolute) symbol index in the slot of the radio frame, CS / comb offset hopping can be performed as the SRS symbols increase.

[0266] [Equation 5]

[0267]

[0268] [Equation 6]

[0269]

[0270] When a duplicate configuration is configured for a specific SRS resource, the UE may not perform a CS / comb offset jump for the duplicate factor R value, and may operate as follows to maintain the SRS CS / comb offset value.

[0271] In each SRS transmission instance corresponding to the SRS resource (for each SRS resource transmission cycle), the CS / comb offset value obtained by applying the first (absolute) SRS symbol index (or the nth or last SRS symbol index) in the repetition cycle to the CS / comb offset jump equation can remain the same during the repetition cycle.

[0272] According to the implementation method, in the next repetition cycle, the CS / comb offset value obtained by performing a jump (corresponding to 1 jump) in the previous repetition cycle is not uniformly applied. Specifically, the CS / comb offset value obtained by applying the first (absolute) SRS symbol index (or the nth or last SRS symbol index) in the next repetition cycle to the CS / comb offset jump equation is uniformly applied. That is, the pattern associated with the CS / comb offset jump can be determined based on the symbol index of the first symbol of the repetition according to the repetition factor.

[0273] Proposal A-1-2

[0274] When repeatability is configured for a specific SRS resource, the CS / comb offset jump is not performed for the repeatability factor R value, and the input parameters in Equations 5 and 6 can be changed and applied to maintain the SRS CS / comb offset value.

[0275] Specifically, the value of l, which serves as the input parameter in Equations 5 and 6, can be applied / input in the following modified form. The value of l can be modified to a form where the value of l is divided by the value of R and rounded down before being input (e.g., In other words, when performing repetition, the CS / comb offset jump can be modified as shown in Equations 7 and 8 below.

[0276] [Equation 7]

[0277]

[0278] [Equation 8]

[0279]

[0280] The benefits of Proposal A-1 are: Maintaining the CS value during the R symbols of repeated SRS allows base stations to easily obtain coverage enhancement through channel measurements without requiring separate sequence separation operations. Furthermore, no comb value transition is performed during the R symbols, thus achieving coverage enhancement for the same FR domain resources.

[0281] Proposal A-2

[0282] The following describes a method for maintaining CS and / or comb offset values ​​when configuring frequency hopping (FH) for SRS resources.

[0283] Proposal A-2-1

[0284] When FH is configured for a specific SRS resource, the UE does not perform CS / comb offset transition during the completion of FH, and can operate as follows to maintain the SRS CS / comb offset value.

[0285] (Similar to A-1-1) In each SRS transmission instance of the corresponding SRS resource (for each SRS resource transmission period), during the period when the UE performs the corresponding FH, the CS / comb offset value obtained by applying the first (absolute) SRS symbol index (or the nth or last SRS symbol index) within the period of performing FH (the period of completing FH) to the CS / comb offset jump equation can remain the same.

[0286] Proposal A-2-2

[0287] When FH is configured for a specific SRS resource, the CS / comb offset transition is not performed during the completion of FH, and the input parameters in Equations 5 and 6 can be changed and applied to maintain the SRS CS / comb offset value.

[0288] Specifically, the l value, which serves as the input parameter in Equations 5 and 6, can be applied / input with the following modification: The l value can be modified such that the l value is divided by a value corresponding to the number of hops required to complete the frequency transition (e.g., and / or ) in the form of (e.g., ), and undergoes rounding down and is input. That is, when FH is executed, the CS / comb offset jump can be modified as shown in Equations 9 and 10 below.

[0289] [Equation 9]

[0290]

[0291] [Equation 10]

[0292]

[0293] Additional implementation of Proposal A-1 / 2: Hereinafter, a method for maintaining CS and / or comb offset values ​​when both repetition and frequency hopping (FH) are configured for SRS resources will be described.

[0294] The UE can operate based on a combination of Proposal A-1 and Proposal A-2-1.

[0295] As an example, in each SRS transmission instance corresponding to the SRS resource (for each SRS resource transmission cycle), the CS / comb offset value obtained by applying the first (absolute) SRS symbol index (or the nth or last SRS symbol index) in both the repetition and FH cycles can remain the same during the repetition and FH cycles.

[0296] As an example, when repeat and FH are configured for a specific SRS resource, the CS / comb offset jump is not performed during the repeat / FH completion period, and the input parameters in Equations 5 and 6 can be changed and applied to maintain the SRS CS / comb offset value.

[0297] Specifically, the value of l can be modified to the following form (e.g., ), where the value of l, which serves as the input parameter in equations 5 and 6, is divided by R and the number of hops required to complete the frequency transition (e.g., and / or The corresponding value is the product of () and is rounded down before being input. That is, when performing repetition, the CS / comb offset jump can be modified as shown in Equations 11 and 12 below.

[0298] [Equation 11]

[0299]

[0300] [Equation 12]

[0301]

[0302] The effects of Proposal A-2 and the additional implementation: Performing CS / comb offset hopping on a completion FH basis allows the base station to easily achieve SRS interference randomization by assigning randomized CS / comb offset values ​​to each unit of completion FH for each SRS transmitted by each UE.

[0303] Proposal A-3

[0304] To facilitate UE implementation, the UE does not expect to configure / indicate both sequence groups or sequence transitions and CS / comb offset transitions simultaneously during SRS sequence generation. Through corresponding operations, as the symbol index increases, only sequence groups or sequence transitions or only CS / comb offset transitions are executed, thereby reducing UE implementation complexity. Furthermore, both sequence groups or sequence transitions and CS / comb offset transitions serve the same purpose (SRS interference randomization), allowing the base station to configure / indicate either operation to the UE based on the environment. For example, the base station can configure / indicate the enabling of either "sequence group / sequence transition" or "CS / comb offset transition" to the UE.

[0305] Issue B: When configuring CS / comb offset hopping for UE SRS, a reinitialization period may need to be defined to complete the hopping and return to the origin. In the case of PUCCH CS hopping, the reinitialization period is defined as returning to the origin in radio frames after the hopping is performed via the symbol index. However, when SRS CS / comb offset hopping is performed via additional variables besides the symbol index, as in the implementation of Proposal A, additional reinitialization definitions may be required. This is described in Proposal B.

[0306] Proposal B

[0307] Implementation Method 0

[0308] When the PUCCH CS transition pattern is widely used as in Proposals 2-5 above, the reinitialization period can be determined on a radio frame basis.

[0309] Implementation Method 1

[0310] When the CS / comb offset value corresponding to the first symbol of the repetition / FH is maintained and used during the repetition / FH, as in Proposal A-1-1 and / or Proposal A-2-1, the reinitialization period can be determined on a radio frame basis. The reason for using (absolute) symbol indexing is that Implementation 1 is the same as Implementation 0 described above.

[0311] Implementation Method 2

[0312] In the following text, when configuring repeatability and / or FH for SRS resources, the reinitialization period can be determined / defined as follows.

[0313] The initialization period can be a multiple of the number of hops required to complete a CS / comb offset transition, corresponding to i) the R value (repetition factor), ii) the number of hops required to complete a frequency transition, or iii) the product of R and the number of hops required to complete a frequency transition. That is, the initialization period can be defined / determined as the value corresponding to i) the R value (repetition factor), ii) the number of hops required to complete a frequency transition, or iii) the product of R and the number of hops required to complete a frequency transition. The initialization period can be predefined or configured by the base station.

[0314] Implementation Method 3

[0315] The number of symbols (of SRS resources) that complete the probe in a time slot can be a multiple of the number of hops required to complete the CS / comb offset transition (or / and impose this constraint on the base station configuration). That is, for each time slot, the starting point of the CS / comb offset transition can be restricted to be the same (returning to the origin).

[0316] In this case, since the CS / comb offset transition pattern is the same for each time slot (i.e., CS / comb offset is performed from the origin), interference randomization can be facilitated even if the same time / FR resources are used between UE SRS within the time slot.

[0317] Implementation Method 4

[0318] The base station can be configured to return to the origin after a certain number of time slots (or symbols) following a CS / comb offset transition. In this case, since the base station determines the reinitialization period, it can facilitate CS / comb resource and interference control for SRS from the perspective of NW.

[0319] Implementation Method 5

[0320] It can be assumed that the base station is able to change / update the interval of the CS / comb offset value between transitions during the SRS CS / comb offset transition. Depending on whether the base station configuration / indication of the repetition count / FH is configured, the CS / comb offset value can ultimately be configured to return to the origin / position during the transmission of the corresponding SRS when transitioning for the repetition count value / time required to complete the FH.

[0321] In other words, as an example, when the number of repetitions is N, if the CS / comb offset value can be shifted by 1 unit, it will return to the original position after N repetitions. When the number of repetitions is N / 2, the CS / comb offset value can be increased by 2 units and return to the original position after N / 2 repetitions.

[0322] As an example, the values ​​of initialization-related information based on at least one of the above embodiments 0 to 5 can be configured as follows.

[0323] i) The relevant information can be reinitialized by UE (or by serving cell).

[0324] ii) The relevant information can be reinitialized for each SRS resource configuration.

[0325] Reinitialization information may include at least one of the following: i) radio frame unit period, ii) indication of initialization based on R (repetition factor), iii) indication of initialization based on frequency hop related hop number, iv) indication of initialization based on R* hop number, v) indication of initialization based on SRS related time slot, and vi) number of time slots and / or number of symbols.

[0326] As an example, re-initializing related information can be based on high-level parameters in the serving cell configuration (e.g., ServingCellConfig), SRS configuration information (e.g., SRS configuration), or SRS resource configuration (e.g., SRS-resource).

[0327] As an example, reinitialization information can be configured to be identical for all UEs within the cell. That is, the reinitialization information can be cell-common information. As a specific example, the reinitialization information can be based on higher-level parameters in the System Information Block (SIB) or the Serving Cell Common Configuration (e.g., ServingCellConfigCommon).

[0328] Obviously, the equations presented above do not limit the spirit of this disclosure, and modifications to the equations may also be included in the spirit of this disclosure.

[0329] Examples of UE (or base station) operation based on at least one of the above embodiments (e.g., at least one of Proposal 1, Proposal 2, Proposal 2-1, Proposal 2-2, Proposal 2-3, Proposal 2-4, Proposal 2-5, Proposal A and / or Proposal B) are as follows.

[0330] 1) (M-TRP related) Receive (send) SRS related configuration information

[0331] Specifically, the configuration information may include information based on at least one of Proposal 1, Proposal 2, Proposal 2-1, Proposal 2-2, Proposal 2-3, Proposal 2-4, Proposal 2-5, Proposal A, and / or Proposal B. As an example, based on the configuration information, multiple spatialRelationInfo / TCIs ​​can be configured / indicated for SRS resources in a specific SRS resource set. As an example, based on the configuration information, at least one of the following can be configured / indicated differently for different SRS resources (sets) with different expected / target TRPs: 1) Sequence initialization factor, 2) Sequence (group) transition pattern, 3) Frequency transition pattern, 4) RPFS pattern, 5) Comb offset, 6) Comb offset transition pattern, 7) Cyclic shift, and / or 8) Cyclic shift transition pattern.

[0332] 2) Configure / activate / indicate the transmission (receive) of SRS based on P / SP / AP-SRS.

[0333] Specifically, the UE may send an SRS resource set configured / activated / indicated by RRC / MAC CE / DCI based on at least one of Proposal 1, Proposal 2, Proposal 2-1, Proposal 2-2, Proposal 2-3, Proposal 2-4, Proposal 2-5, Proposal A and / or Proposal B.

[0334] The UE / base station operations are merely examples and not every operation (or step) is required. Depending on the UE / base station implementation, operations related to uplink transmission of the UE according to the above implementation may be omitted or added.

[0335] In terms of implementation, the operation of the base station / UE according to the above embodiments (e.g., operation based on at least one of Proposal 1, Proposal 2, Proposal 2-1, Proposal 2-2, Proposal 2-3, Proposal 2-4, Proposal 2-5, Proposal A and / or Proposal B) can be described below. Figure 7 The device in (e.g.) Figure 7 Processed by processors 110 and 210 in the system.

[0336] Furthermore, the operation of the base station / UE according to the above embodiments (e.g., operation based on at least one of Proposal 1, Proposal 2, Proposal 2-1, Proposal 2-2, Proposal 2-3, Proposal 2-4, Proposal 2-5, Proposal A and / or Proposal B) can be used to drive at least one processor (e.g., Figure 7 The instructions / programs (e.g., instructions and executable code) in the form of 110 and 210 are stored in memory (e.g., Figure 7 (140 and 240 in the middle).

[0337] In the following text, reference will be made to Figure 5 and Figure 6The above-described embodiments are described in detail with respect to the operation of the UE and the base station. The methods described below are distinguished only for ease of description, and it is not necessary to say that some components of any one method can be replaced by some components of another method, or can be combined with each other.

[0338] Figure 5 This is a flowchart describing a method performed by a user equipment (UE) according to one embodiment of the present disclosure.

[0339] Reference Figure 5 According to an embodiment of the present disclosure, a method performed by a UE in a wireless communication system includes a step of receiving configuration information related to SRS (S510) and a step of transmitting SRS based on SRS resources (S520).

[0340] In S510, the UE receives configuration information related to the Sounding Reference Signal (SRS) from the base station. This configuration information includes information about SRS resources (e.g., SRS-Resource). As an example, the configuration information can be based on the SRS-Config in Table 1.

[0341] The configuration information may include information related to the configuration based on at least one of Proposal 1, Proposal 2, Proposal 2-1, Proposal 2-2, Proposal 2-3, Proposal 2-4, Proposal 2-5, Proposal A and / or Proposal B.

[0342] As an example, comb offset transitions and / or cyclic shift transitions can be configured in the SRS resource. The transition patterns associated with comb offset transitions and / or cyclic shift transitions can be based on pseudo-random sequences.

[0343] In S520, the UE sends SRS to the base station based on SRS resources.

[0344] As an example, based on the above implementation, SRS can be transmitted based on at least one of the following: 1) sequence initialization factor, 2) sequence (group) transition pattern, 3) frequency transition pattern, 4) RPFS pattern, 5) comb value, 6) comb value transition pattern, 7) cyclic shift and / or 8) cyclic shift transition pattern.

[0345] As an example, SRS can be periodic SRS, non-periodic SRS, or semi-persistent SRS.

[0346] According to the implementation, initialization associated with comb offset transitions and / or cyclic shift transitions can be performed on a periodic basis. This implementation can be based on Proposal B. This will be described in detail below.

[0347] The period can be determined based on at least one of the following: i) configuration value, ii) repetition factor associated with SRS, iii) value associated with frequency jump, and / or iv) time slot associated with SRS.

[0348] As an example, configuration values ​​can be values ​​in units of radio frames, time slots, or symbols.

[0349] As an example, the period can be determined as the product of a repetition factor and a value associated with the frequency jump.

[0350] As an example, initialization can be associated with a pseudo-random sequence. The period can be associated with the start of a radio frame. As a specific example, the period can be based on the period of repeating radio frames. The period can be defined as the value of the modulo operation of the System Frame Number (SFN) associated with the radio frame. The assumption and description are that the period is determined to be N. Radio frames can be based on each radio frame where SFN mod N = 0.

[0351] According to the implementation, the transition pattern (related to comb-shaped shift transitions and / or cyclic shift transitions) can be determined based on the symbol index of the first symbol of the repetition according to the repetition factor. This implementation can be based on Proposal A-1. Specifically, it can be based on Determine the symbol index of the first symbol. It can be a symbol number based on the number of symbols configured in the SRS resource. R can be a repetition factor. It can be a floor function. The repetition factor is greater than 1.

[0352] The method may also include the step of receiving period-related information. Specifically, the UE receives period-related configuration information from the base station. Factors related to the determination of the period can be indicated based on the period-related information. This implementation may be based on Proposal B. The factor may be: i) a value in radio frames, time slots, or symbols; ii) a repetition factor; iii) a value related to frequency hopping (e.g., hop count); iv) the product of the repetition factor and the value related to frequency hopping; or v) a time slot related to SRS.

[0353] The above-mentioned operation based on S510 and S520, as well as the steps for receiving periodic related information, can be provided by... Figure 7 This can be achieved using devices within the UE. For example, the UE 200 can control one or more transceivers 230 and / or one or more memories 240 to perform operations based on S510 and S520 and the periodic information-related reception steps.

[0354] The above implementation method will be described in detail below in terms of the operation of the base station.

[0355] The following descriptions of S610 and S630, as well as the cycle-related information transmission steps, correspond to... Figure 5 The steps for receiving S510 and S520, as well as periodic information, are described below. Redundant descriptions have been omitted to account for correspondences. In other words, the specific descriptions of the base station operations described below can be replaced with the corresponding... Figure 5 Description / implementation method.

[0356] Figure 6 This is a flowchart describing a method performed by a base station according to another embodiment of the present disclosure.

[0357] In S610, the base station sends configuration information related to the Sounding Reference Signal (SRS) to the UE. The configuration information includes information about SRS resources (e.g., SRS-Resource). As an example, the configuration information can be based on SRS-Config in Table 1.

[0358] In S620, the base station receives SRS from the UE based on SRS resources.

[0359] The method may also include the step of sending period-related information. Specifically, the base station sends period-related information to the UE.

[0360] The above-mentioned operations based on S610 and S620, as well as the steps for sending periodic related information, can be provided by... Figure 7 This can be achieved using devices within the system. For example, base station 100 can control one or more transceivers 130 and / or one or more memories 140 to perform operations based on S610 and S620 and the periodic information-related transmission steps.

[0361] The following reference Figure 7 Describes the apparatus to which embodiments of this disclosure are applicable (apparatus for implementing the methods / operations according to embodiments of this disclosure).

[0362] Figure 7 The configurations of the first and second devices according to embodiments of the present disclosure are illustrated.

[0363] The first device 100 may include a processor 110, an antenna unit 120, a transceiver 130, and a memory 140.

[0364] Processor 110 can perform baseband-related signal processing and includes a higher-layer processing unit 111 and a physical layer processing unit 115. Higher-layer processing unit 111 can handle operations at the MAC layer, RRC layer, or higher layers. Physical layer processing unit 115 can handle PHY layer operations. For example, if the first device 100 is a base station (BS) device in BS-UE communication, physical layer processing unit 115 can perform uplink receive signal processing, downlink transmit signal processing, etc. For example, if the first device 100 is a first UE device in UE-to-UE communication, physical layer processing unit 115 can perform downlink receive signal processing, uplink transmit signal processing, sidelink transmit signal processing, etc. In addition to performing baseband-related signal processing, processor 110 can also control the overall operation of the first device 100.

[0365] Antenna unit 120 may include one or more physical antennas, and if antenna unit 120 includes multiple antennas, MIMO transmission / reception is supported. Transceiver 130 may include a radio frequency (RF) transmitter and an RF receiver. Memory 140 may store information processed by processor 110, as well as software, operating system, and applications related to the operation of first device 100. Memory 140 may also include components such as buffers.

[0366] In the embodiments described in this disclosure, the processor 110 of the first device 100 may be configured to implement the operation of the BS in BS-UE communication (or the operation of the first UE device in UE-UE communication).

[0367] The second device 200 may include a processor 210, an antenna unit 220, a transceiver 230, and a memory 240.

[0368] Processor 210 can perform baseband-related signal processing and includes a higher-layer processing unit 211 and a physical layer processing unit 215. Higher-layer processing unit 211 can handle operations at the MAC layer, RRC layer, or higher layers. Physical layer processing unit 215 can handle PHY layer operations. For example, if the second device 200 is a UE device in BS-UE communication, physical layer processing unit 215 can perform downlink receive signal processing, uplink transmit signal processing, etc. For example, if the second device 200 is a second UE device in inter-UE communication, physical layer processing unit 215 can perform downlink receive signal processing, uplink transmit signal processing, sidelink receive signal processing, etc. In addition to performing baseband-related signal processing, processor 210 can also control the overall operation of the second device 200.

[0369] Antenna unit 220 may include one or more physical antennas, and if antenna unit 220 includes multiple antennas, MIMO transmission / reception is supported. Transceiver 230 may include an RF transmitter and an RF receiver. Memory 240 may store information processed by processor 210, as well as software, operating system, and applications related to the operation of second device 200. Memory 240 may also include components such as buffers.

[0370] In the embodiments described in this 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 UE-to-UE communication).

[0371] The descriptions of the BS and UE (or the first UE device and the second UE device in inter-UE communication) in the examples of this disclosure are equivalent to those for the operation of the first device 100 and the second device 200, and redundant descriptions are omitted.

[0372] In addition to LTE, NR, and 6G, the wireless communication technologies implemented in apparatus 100 and apparatus 200 according to this disclosure may also include narrowband Internet of Things (NB-IoT) for low-power communication. For example, NB-IoT technology may be an example of low-power wide-area network (LPWAN) technology and may be implemented in standards such as LTE Cat NB1 and / or LTE Cat NB2. NB-IoT technology is not limited to the names mentioned above.

[0373] Additionally or alternatively, the wireless communication technology implemented in apparatus 100 and apparatus 200 according to this disclosure may be based on LTE-M technology to perform communication. For example, LTE-M technology may be an example of LPWAN technology and may be referred to by various names, such as Enhanced Machine Type Communication (eMTC). For example, LTE-M technology may be implemented using 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. LTE-M technology is not limited to the names mentioned above.

[0374] Additionally or alternatively, considering low-power communication, the wireless communication technologies implemented in apparatus 100 and apparatus 200 according to this disclosure may include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN), and are not limited to the aforementioned names. For example, ZigBee technology can be based on various standards such as IEEE 802.15.4 to create personal area networks (PANs) associated with small / low-power digital communication, 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: Receive configuration information related to the Sound Reference Signal (SRS), wherein the configuration information includes information regarding SRS resources. Specifically, comb-shaped offset transitions and / or cyclic shift transitions are configured for the SRS resources; and The SRS is sent based on the SRS resource. Specifically, initialization related to the comb-shaped offset transition and / or the cyclic shift transition is performed periodically. The period is determined based on at least one of the following: i) a configuration value, ii) a repetition factor associated with the SRS, iii) a value associated with frequency jumps, and / or iv) a time slot associated with the SRS.

2. The method according to claim 1, wherein, The configuration values ​​are values ​​in units of radio frames, time slots, or symbols.

3. The method according to claim 1, wherein, The period is determined to be the product of the repetition factor and a value associated with the frequency jump.

4. The method according to claim 1, wherein, The transition patterns associated with the comb-shaped offset transitions and / or the cyclic shift transitions are based on pseudo-random sequences.

5. The method according to claim 4, wherein, The initialization is related to the pseudo-random sequence, and The period is related to the start of a radio frame.

6. The method according to claim 4, wherein, The transition pattern is determined based on the symbol index of the first symbol of the repetition of the repeating factor.

7. The method according to claim 6, wherein, based on To determine the symbol index of the first symbol, It is the symbol number based on the number of symbols configured in the SRS resource, R is the repetition factor, and It is a floor function.

8. The method according to claim 7, wherein, The repeatability factor is greater than 1.

9. The method according to claim 1, further comprising: Receive information related to the cycle. The information related to the period indicates factors related to the determination of the period.

10. The method according to claim 9, wherein, The factor is: i) a value in radio frames, time slots, or symbols; ii) the repetition factor; iii) a value associated with the frequency jump; iv) the product of the repetition factor and the value associated with the frequency jump; or v) a time slot associated with the SRS.

11. A user equipment operating in a wireless communication system, the user equipment comprising: One or more transceivers; One or more processors; as well as One or more memories, said one or more memories being connected to said one or more processors and storing instructions. The instructions are based on the one or more processors executing all the steps of configuring the one or more processors to perform the method according to any one of claims 1 to 10.

12. An apparatus comprising: One or more memory units; as well as One or more processors, said one or more processors being operatively connected to said one or more memories, The one or more memory storage instructions are based on the one or more processors executing all the steps of configuring the one or more processors to perform the method according to any one of claims 1 to 10.

13. One or more non-transitory computer-readable media storing instructions, in, The instructions, which can be executed by one or more processors, configure the one or more processors to perform all the steps of the method according to any one of claims 1 to 10.

14. A method performed by a base station in a wireless communication system, the method comprising: Send configuration information related to the Sounding Reference Signal (SRS), wherein the configuration information includes information regarding SRS resources. Specifically, comb-shaped offset transitions and / or cyclic shift transitions are configured for the SRS resources; and The SRS is received based on the SRS resource. Specifically, initialization related to the comb-shaped offset transition and / or the cyclic shift transition is performed periodically. The period is determined based on at least one of the following: i) a configuration value, ii) a repetition factor associated with the SRS, iii) a value associated with frequency jumps, and / or iv) a time slot associated with the SRS.

15. 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, said one or more memories being connected to said one or more processors and storing instructions. The instructions are based on the one or more processors executing all the steps of the method according to claim 14.

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