APPARATUS AND METHOD FOR PERFORMING SRS TRANSMISSION AND RECEPTION BASED ON MULTIPLE SYMBOLS IN A WIRELESS COMMUNICATION SYSTEM - Patent application

Abstract

According to various embodiments of the present disclosure, there is provided a method for operating a terminal in a wireless communication system, comprising the steps of: receiving SRS configuration information from a base station, the SRS configuration information including a repetitionFactor, which is a number of repeated transmissions of an SRS (sounding reference signal) in one slot, and nrofSymbols, which is a number of symbols related to the SRS in one slot; and determining one or more of L or M times for repeated transmission of the SRS based on a number N of consecutive symbols related to the transmission of the SRS and the repetitionFactor. The method includes the steps of repeating an operation of transmitting the SRS to the base station for every N consecutive symbols in a first frequency domain L times, and repeating an operation of transmitting the SRS to the base station for every N consecutive symbols in a second frequency domain L times or M times, wherein the transmission of the SRS is associated with a plurality of antenna ports in the terminal, and time resource regions related to each of the plurality of antenna ports are allocated within the N consecutive symbols without overlapping with each other.

Description

[Technical field]

[0001] The present disclosure relates to an apparatus and method for performing transmission and reception of a sounding reference signal (SRS) based on multiple symbols in a wireless communication system, and more particularly, to an apparatus and method for transmitting and receiving an SRS by applying N-Symbol-based time division multiplexing (TDM) and / or time division-orthogonal cover code (TD-OCC) in a wireless communication system. [Background technology]

[0002] In the 3GPP (registered trademark) Release 18 MIMO SRS discussion, discussion is planned to introduce 8-port SRS (sounding reference signal) transmission. In the current standard, 1-, 2-, and 4-port SRS transmission is possible, and it is defined so that all ports can be transmitted within a single symbol. Among various port multiplexing methods, a method of applying N-symbol-based TDM (time division multiplexing) and / or TD-OCC (time division-orthogonal cover code) can be considered.

[0003] In this disclosure, we propose a method to solve problems that may occur when applying N-symbol-based TDM and / or TD-OCC. Summary of the Invention [Problem to be solved by the invention]

[0004] To solve the above problem, the present disclosure provides an apparatus and method for performing transmission and reception of a sounding reference signal (SRS) based on multiple symbols in a wireless communication system.

[0005] The present disclosure provides an apparatus and method for transmitting and receiving an SRS by applying N-symbol-based time division multiplexing (TDM) and / or time division-orthogonal cover code (TD-OCC) in a wireless communication system.

[0006] The technical problems to be achieved in the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present disclosure pertains from the following description. [Means for solving the problem]

[0007] According to various embodiments of the present disclosure, there is provided a method for operating a terminal in a wireless communication system, comprising the steps of: receiving SRS configuration information from a base station, the SRS configuration information including a repetitionFactor, which is a number of repeated transmissions of an SRS (sounding reference signal) in one slot, and nrofSymbols, which is a number of symbols related to the SRS in one slot; determining one or more of a number of times L or M for repeated transmission of the SRS based on the repetitionFactor; repeating an operation of transmitting the SRS to the base station for every N consecutive symbols in a first frequency domain L times; and repeating an operation of transmitting the SRS to the base station for every N consecutive symbols in a second frequency domain L times or M times, wherein the transmission of the SRS is associated with a plurality of antenna ports in the terminal, and time resource regions related to each of the plurality of antenna ports are allocated within the N consecutive symbols without overlapping with each other.

[0008] According to various embodiments of the present disclosure, there is provided a method for operating a base station in a wireless communication system, the method including: transmitting SRS configuration information to a terminal, the SRS configuration information including a repetitionFactor, which is a number of times of repeated transmission of an SRS (sounding reference signal) in one slot, and nrofSymbols, which is a number of symbols associated with the SRS in one slot; repeating an operation of receiving the SRS from the terminal for every N consecutive symbols in a first frequency domain L times; and repeating an operation of receiving the SRS for every N consecutive symbols in a second frequency domain from the terminal L times or M times, where N is the number of consecutive symbols associated with transmission of the SRS, L and M are the number of times for repeated transmission of the SRS based on the repetitionFactor, and reception of the SRS is associated with a plurality of antenna ports in the base station, and time resource regions associated with each of the plurality of antenna ports do not overlap with each other and are allocated within the N consecutive symbols.

[0009] According to various embodiments of the present disclosure, there is provided a terminal in a wireless communication system, the terminal including a transceiver, at least one processor, and at least one memory operably connected to the at least one processor and storing instructions for performing operations when executed by the at least one processor, the operations including all steps of the terminal operating methods according to various embodiments of the present disclosure.

[0010] According to various embodiments of the present disclosure, there is provided a base station in a wireless communication system, the base station including a transceiver, at least one processor, and at least one memory operably connected to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations, the operations including all steps of a method of operating a base station according to various embodiments of the present disclosure.

[0011] According to various embodiments of the present disclosure, there is provided a control device for controlling a terminal in a wireless communication system, the control device including at least one processor and at least one memory operably connected to the at least one processor, the at least one memory storing instructions for performing operations based on being executed by the at least one processor, the operations including all steps of a terminal operating method according to various embodiments of the present disclosure.

[0012] According to various embodiments of the present disclosure, there is provided a control device for controlling a base station in a wireless communication system, the control device including at least one processor and at least one memory operably connected to the at least one processor, the at least one memory storing instructions for performing operations based on being executed by the at least one processor, the operations including all steps of a base station operating method according to various embodiments of the present disclosure.

[0013] According to various embodiments of the present disclosure, one or more non-transitory computer-readable media are provided that store one or more instructions, the one or more instructions being executed by one or more processors to perform operations, the operations including all steps of a method of operating a terminal according to various embodiments of the present disclosure.

[0014] According to various embodiments of the present disclosure, one or more non-transitory computer-readable media are provided that store one or more instructions, the one or more instructions being executed by one or more processors to perform operations, the operations including all steps of a base station operating method according to various embodiments of the present disclosure. Effect of the Invention

[0015] To solve the above problem, the present disclosure may provide an apparatus and method for performing transmission and reception of a sounding reference signal (SRS) based on multiple symbols in a wireless communication system.

[0016] The present disclosure may provide an apparatus and method for transmitting and receiving an SRS by applying N-symbol-based time division multiplexing (TDM) and / or time division-orthogonal cover code (TD-OCC) in a wireless communication system. [Brief description of the drawings]

[0017] The drawings attached below are for facilitating understanding of the present disclosure, and together with the detailed description, can provide embodiments of the present disclosure. However, the technical features of the present disclosure are not limited to specific drawings, and the features disclosed in each drawing can be combined with each other to form a new embodiment. The reference numerals in each drawing can refer to structural elements.

[0018] [Figure 1] A diagram showing an example of physical channels used in a system applicable to the present disclosure and a general signal transmission method using the channels. [Diagram 2] FIG. 1 is a diagram illustrating an example of UL uplink beam management (BM) using a sounding reference signal (SRS) in a system applicable to the present disclosure. [Diagram 3] FIG. 1 is a diagram illustrating an example of UL uplink beam management (BM) using a sounding reference signal (SRS) in a system applicable to the present disclosure. [Figure 4] A figure showing an example of downlink transmission and reception related procedures in a system applicable to the present disclosure. [Diagram 5]A figure showing an example of an uplink transmission and reception related procedure in a system applicable to the present disclosure. [Figure 6] FIG. 2 is a diagram illustrating an example of SRS transmission performing frequency hopping in a system applicable to the present disclosure. [Figure 7] FIG. 1 is a diagram illustrating an example of SRS transmission that performs frequency hopping in a system applicable to the present disclosure. [Figure 8] FIG. 2 is a diagram illustrating an example of SRS transmission performing frequency hopping in a system applicable to the present disclosure. [Figure 9] FIG. 2 is a diagram illustrating an example of SRS transmission performing frequency hopping in a system applicable to the present disclosure. [Figure 10] FIG. 2 is a diagram illustrating an example of SRS transmission performing frequency hopping in a system applicable to the present disclosure. [Figure 11] FIG. 2 is a diagram illustrating an example of SRS transmission performing frequency hopping in a system applicable to the present disclosure. [Figure 12] FIG. 2 is a diagram illustrating an example of SRS transmission performing frequency hopping in a system applicable to the present disclosure. [Figure 13] FIG. 1 is a diagram illustrating an example of SRS transmission with group / sequence hopping in a system applicable to the present disclosure. [Figure 14] FIG. 1 is a diagram illustrating an example of SRS transmission with group / sequence hopping in a system applicable to the present disclosure. [Figure 15] FIG. 13 is a diagram showing a signal flow chart between a terminal and a base station in a system applicable to the present disclosure. [Figure 16] FIG. 13 is a diagram illustrating an example of an operation process of a terminal in a system applicable to the present disclosure. [Figure 17] A diagram showing an example of the operation process of a base station in a system applicable to the present disclosure. [Figure 18] 1 is a diagram illustrating an example of the configuration of a first device and a second device in a system applicable to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] In various embodiments of the present disclosure, "A or B" can mean "A only," "B only," or "both A and B." In other words, in various embodiments of the present disclosure, "A or B" can be interpreted as "A and / or B." For example, in various embodiments of the present disclosure, "A, B, or C" can mean "A only," "B only," "C only," or "any combination of A, B and C."

[0020] A slash ( / ) or a comma as used in various embodiments of the present disclosure can mean "and / or." For example, "A / B" can mean "A and / or B." Thus, "A / B" can mean "A only," "B only," or "A and all of B." For example, "A, B, C" can mean "A, B, or C."

[0021] In various embodiments of the present disclosure, "at least one of A and B" can mean "A only," "B only," or "all of A and B." Furthermore, in various embodiments of the present disclosure, the phrase "at least one of A or B" or "at least one A and / or B" can be interpreted the same as "at least one of A and B."

[0022] Furthermore, in various embodiments of the present disclosure, "at least one of A, B and C" can mean "A only," "B only," "C only," or "any combination of A, B and C." Furthermore, "at least one of A, B or C" or "at least one of A, B and / or C" can mean "at least one of A, B and C."

[0023] Furthermore, parentheses used in various embodiments of the present disclosure may mean "for example." Specifically, when "control information (PDCCH)" is displayed, "PDCCH" may be proposed as an example of "control information." In other words, "control information" in various embodiments of the present disclosure is not limited to "PDCCH," and "PDDCH" may be proposed as an example of "control information." Also, even when "control information (i.e., PDCCH)" is displayed, "PDCCH" may be proposed as an example of "control information."

[0024] Technical features described separately in one drawing in various embodiments of the present disclosure may be realized separately or simultaneously.

[0025] Common signal transmission methods in 3GPP

[0026] Physical Channels and General Signal Transmission

[0027] 1 is a diagram illustrating an example of physical channels used in a system applicable to the present disclosure and a general signal transmission method using the physical channels. Specifically, FIG. 1 illustrates physical channels used in a 3GPP system and general signal transmission.

[0028] In a wireless communication system, a terminal receives information from a base station via a downlink (DL), and transmits information to the base station via an uplink (UL). Information exchanged between the base station and the terminal includes data and various control information, and various physical channels exist depending on the type / purpose of the information exchanged.

[0029] When the terminal is powered on or newly enters a cell, the terminal performs an initial cell search such as synchronizing with a base station (S201). To this end, the terminal receives a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station to synchronize with the base station and acquire information such as a cell ID. Then, the terminal receives a physical broadcast channel (PBCH) from the base station to acquire broadcast information within the cell. Meanwhile, the terminal receives a downlink reference signal (DL RS) in the initial cell search stage to check the downlink channel state.

[0030] After completing the initial cell search, the terminal can acquire more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on the information carried on the PDCCH (S202).

[0031] Meanwhile, when the terminal first connects to the base station or has no radio resources for signal transmission, the terminal can perform a random access procedure (RACH) to the base station (S203 to S206). To this end, the terminal transmits a specific sequence as a preamble via a physical random access channel (PRACH) (S203 and S205) and can receive a response message (Random Access Response (RAR) to the preamble via a PDCCH and a corresponding PDSCH). In the case of a contention-based RACH, the terminal can further perform a contention resolution procedure (S206).

[0032] After performing the above-mentioned procedure, the terminal can then perform PDCCH / PDSCH reception (S207) and Physical Uplink Shared Channel (PUSCH) / Physical Uplink Control Channel (PUCCH) transmission (S208) as a general uplink / downlink signal transmission procedure. In particular, the terminal can receive Downlink Control Information (DCI) via the PDCCH. Here, the DCI includes control information such as resource allocation information for the terminal, and can be applied in different formats depending on its purpose.

[0033] Meanwhile, control information that the terminal transmits to the base station via the uplink or that the terminal receives from the base station may include a downlink / uplink ACK / NACK signal, a CQI (Channel Quality Indicator), a PMI (Precoding Matrix Index), an RI (Rank Indicator), etc. The terminal may transmit the above-mentioned control information such as CQI / PMI / RI via a PUSCH and / or a PUCCH.

[0034] Table 1 shows an example of DCI FORMAT (format) in an NR system.

[0035] [Table 1]

[0036] Referring to Table 1, DCI format0_0 is used for scheduling PUSCH in one cell. Information included in DCI format0_0 is CRC scrambled by C-RNTI, CS-RNTI, or MCS-C-RNTI and transmitted.

[0037] DCI format 0_1 ​​is used to reserve a PUSCH in one cell. Information included in DCI format 0_1 ​​is CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, or MCS-C-RNTI and then transmitted.

[0038] DCI format 1_0 is used for scheduling the PDSCH in one DL cell. Information included in DCI format 1_0 is CRC scrambled by the C-RNTI, CS-RNTI, or MCS-C-RNTI and then transmitted.

[0039] DCI format 1_1 is used for scheduling PDSCH in one cell. Information included in DCI format 1_1 is CRC scrambled by C-RNTI, CS-RNTI, or MCS-C-RNTI and transmitted. DCI format 2_1 is used to notify PRBs and OFDM symbols that can be assumed not to be transmitted by the terminal.

[0040] The following information included in DCI format2_1 is CRC scrambled by INT-RNTI and transmitted.

[0041] - preemption indication 1, preemption indication 2, ..., preemption indication N.

[0042] Technical Problem to be Solved by the Invention

[0043] In the Release 18 MIMO SRS discussion, discussions are planned to introduce 8-port SRS transmission. In the current standard, 1-, 2-, and 4-port SRS transmission is possible, and it is defined so that all ports can be transmitted within a single symbol. Among various port multiplexing methods, a method of applying N-symbol-based TDM and / or TD-OCC can be considered. In this disclosure, a method is proposed that can solve problems that may occur when applying N-symbol-based TDM and / or TD-OCC.

[0044] In this disclosure, " / " can mean either the inclusion of all of the content separated by the / (and) or the inclusion of only a portion of the separated content (or).

[0045] The configuration, operation and other features of the present disclosure will be understood by the embodiments of the present disclosure described with reference to the accompanying drawings.

[0046] Specifications Related Operation of the Present Disclosure

[0047] QCL (Quasi-Co Location)

[0048] Antenna ports are defined such that the channel on which symbols on an antenna port are carried can be inferred from the channel on which other symbols on the same antenna port are carried. If the properties of the channel on which symbols on one antenna port are carried can be inferred from the channel on which symbols on the other antenna port are carried, then the two antenna ports are said to be in a quasi co-located (QC / QCL) relationship.

[0049] Here, the channel characteristics include one or more of delay spread, Doppler spread, frequency / Doppler shift, average received power, received timing / average delay, and spatial Rx parameter, where spatial Rx parameter refers to a spatial (reception) channel characteristic parameter such as angle of arrival.

[0050] The terminal may be configured with a list of up to M TCI-State configurations in the higher layer parameter PDSCH-Config to decode the PDSCH according to the detected PDCCH with the intended DCI for the terminal and the given serving cell, where M depends on the UE capability.

[0051] Each TCI state includes parameters for setting up a quasi co-location relationship between one or two DL reference signals and a DM-RS port of a PDSCH.

[0052] The quasi co-location relationship is set in the higher layer parameter qcl-Type1 of the first DL RS and qcl-Type2 (if set) of the second DL RS. For two DL RSs, the QCL types are not the same, regardless of whether the references are the same DL RS or different DL RSs.

[0053] The quasi colocation type corresponding to each DL RS is given by the higher layer parameter qcl-Type in QCL-Info and can take one of the following values:

[0054] - 'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread}

[0055] - 'QCL-TypeB': {Doppler shift, Doppler spread}

[0056] - 'QCL-TypeC': {Doppler shift, average delay}

[0057] - 'QCL-TypeD': {Spatial Rx parameter}

[0058] For example, if the target antenna port is a specific NZP CSI-RS, the corresponding NZP CSI-RS antenna port may be instructed / configured to be QCLed with a specific TRS from the perspective of QCL-Type A and a specific SSB from the perspective of QCL-Type D. A terminal that receives such instructions / configuration can receive the corresponding NZP CSI-RS using the Doppler and delay values ​​measured in the QCL-TypeA TRS and apply the receiving beam used for QCL-TypeD SSB reception to the corresponding NZP CSI-RS reception.

[0059] The UE can receive an activation command via MAC CE signaling, which is used to map up to eight TCI states to codepoints in the DCI field "Transmission Configuration Indication".

[0060] The standard content for the above QCL may be the same as the following Table 2 (eg, see 3GPP TS 38.214. section 5.1.5.).

[0061] [Table 2-1] [Table 2-2] [Table 2-3] [Table 2-4] [Table 2-5] [Table 2-6] [Table 2-7] [Table 2-8]

[0062] Uplink Beam Management (UL BM)

[0063] FIG. 2 is a diagram showing an example of UL uplink beam management (BM) using a sounding reference signal (SRS) in a system to which the present disclosure can be applied.

[0064] Depending on the implementation of the terminal, the UL BM may or may not have beam reciprocity (or beam correspondence) between the Tx beam and the Rx beam. If the reciprocity between the Tx beam and the Rx beam is established in all the base stations and terminals, the UL beam pair can be matched through the DL beam pair. However, if the reciprocity between the Tx beam and the RX beam is not established in any one of the base stations and terminals, a UL beam pair determination process is required in addition to the DL beam pair determination.

[0065] Furthermore, even if the base station and the terminal all maintain beam correspondence, the base station can use the UL BM procedure for DL ​​Tx beam determination even if the terminal does not request a preferred beam report.

[0066] UL BM may be performed via beamformed UL SRS transmission, and whether UL BM of an SRS resource set is applied is set by usage (a higher layer parameter). If usage is set to "BeamManagement (BM)", only one SRS resource may be transmitted in each of multiple SRS resource sets at a given time instant.

[0067] A terminal may be configured (through higher layer signaling, RRC signaling, etc.) with one or more Sounding Reference Symbol (SRS) resource sets configured by (higher layer parameter) SRS-ResourceSet. For each SRS resource set, the UE may be configured with K≧1 SRS resource (higher later parameter SRS-resource), where K is a natural number and the maximum value of K is indicated by SRS_capability.

[0068] Similar to the DL BM, the UL BM procedure can also be divided into TxTx beam sweeping of the terminal and Rx beam sweeping of the base station.

[0069] Figure 2 shows an example of a UL BM procedure using SRS. Figure 2(a) shows the Rx beam determination procedure of the base station, and Figure 2(b) shows the Tx beam swaging procedure of the terminal.

[0070] 3 is a diagram showing an example of UL uplink beam management (BM) using a sounding reference signal (SRS) in a system applicable to the present disclosure. FIG. 3 is a flowchart showing an example of a UL BM procedure using the SRS.

[0071] The terminal receives RRC signaling (e.g., SRS-Config IE) including a usage parameter set to "beam management" (higher layer parameter) from the base station (S1710).

[0072] Table 3 shows an example of an SRS-Config IE (Information Element), which is used for SRS transmission configuration. The SRS-Config IE includes a list of SRS-Resources and a list of SRS-ResourceSets. Each SRS resource set represents a set of SRS resources.

[0073] The network can trigger the transmission of an SRS resource set using a configured aperiodic SRS-Resource Trigger (L1 DCI).

[0074] [Table 3-1] [Table 3-2] [Table 3-3] [Table 3-4]

[0075] In Table 3, usage indicates a higher layer parameter indicating whether the SRS resource set is used for beam management or for codebook-based or non-codebook-based transmission. The usage parameter corresponds to the L1 parameter 'SRS-SetUse'. 'spatialRelationInfo' is a parameter indicating the setting of a spatial relation between a reference RS and a target SRS. Here, the reference RS can be an SSB, a CSI-RS, or an SRS corresponding to the L1 parameter 'SRS-SpatialRelationInfo'. The usage is set for each SRS resource set.

[0076] The terminal determines the Tx beam of the SRS resource to be transmitted based on the SRS-SpatialRelation Info included in the SRS-Config IE (S1720). Here, the SRS-SpatialRelation Info is set for each SRS resource and indicates whether to apply the same beam as that used in SSB, CSI-RS, or SRS for each SRS resource. Also, the SRS-SpatialRelationInfo may or may not be set for each SRS resource.

[0077] If SRS-SpatialRelationInfo is set in the SRS resource, the same beam as that used in SSB, CSI-RS, or SRS is applied for transmission. However, if SRS-SpatialRelationInfo is not set in the SRS resource, the UE arbitrarily determines a Tx beam and transmits the SRS through the determined Tx beam (S1730).

[0078] More specifically, for P-SRS with "SRS-ResourceConfigType" set to "periodic":

[0079] i) If SRS-SpatialRelationInfo is set to 'SSB / PBCH', the UE transmits the corresponding SRS resource by applying a spatial domain transmission filter that is the same as (or is generated from) the spatial domain Rx filter used for receiving SSB / PBCH; or

[0080] ii) if SRS-SpatialRelationInfo is set to “CSI-RS”, the UE transmits the SRS resource applying the same spatial domain transmission filter as that used for receiving periodic CSI-RS or SP CSI-RS; or

[0081] iii) SRS-If SpatialRelationInfo is set to 'SRS', the UE applies the same spatial domain transmission filter used for transmitting periodic SRS to transmit the corresponding SRS resource.

[0082] Similar beam determination and transmission operations may also be applied when 'SRS-ResourceConfigType' is set to 'SP-SRS' or 'AP-SRS'.

[0083] - Furthermore, the terminal may or may not receive feedback to the SRS from the base station (S1740) in the following three cases:

[0084] i) When Spatial_Relation_Info is set for all SRS resources in the SRS resource set, the terminal transmits the SRS to the beam specified by the base station. For example, when Spatial_Relation_Info specifies the same SSB, CRI, or SRI, the terminal repeatedly transmits the SRS to the same beam. In this case, the base station selects the Rx beam, which corresponds to Figure 2(a).

[0085] ii) Spatial_Relation_Info may not be set for all SRS resources in the SRS resource set. In this case, the terminal can freely change the SRS beam while transmitting. In other words, this case corresponds to Figure 2(b), where the terminal sweeps the Tx beam.

[0086] iii) Spatial_Relation_Info may be configured only for some SRS resources in the SRS resource set. In this case, the SRS is transmitted using the specified beam for the configured SRS resources, and the terminal may transmit the SRS by applying any Tx beam for the SRS resources for which Spatial_Relation_Info is not configured.

[0087] Downlink transmit / receive operations

[0088] FIG. 4 is a diagram illustrating an example of downlink transmission / reception related procedures in a system applicable to the present disclosure.

[0089] The base station schedules downlink transmission such as frequency / time resources, transmission layer, downlink precoder, MCS, etc. (S2201). In particular, the base station can determine a beam for PDSCH transmission to the terminal through the above-mentioned operations.

[0090] The terminal receives downlink control information (DCI) for downlink scheduling (ie, including scheduling information of the PDSCH) from the base station on the PDCCH (S2202).

[0091] For downlink scheduling, DCI format 1_0 or 1_1 may be used, and in particular, DCI format 1_1 includes the following information: DCI format identifier, bandwidth part indicator, frequency domain resource assignment, time domain resource assignment, PRB bundling size indicator, rate matching indicator, ZP CSI-RS trigger, antenna port(s), transmission configuration indication (TCI), SRS request, and DMRS (Demodulation Reference Signal) sequence initialization.

[0092] In particular, the number of DMRS ports can be scheduled according to each state indicated in the Antenna port(s) field, and single-user (SU) / multi-user (MU) transmission scheduling is possible.

[0093] The TCI field is composed of 3 bits, and the QCL for the DMRS is dynamically indicated by indicating up to 8 TCI states according to the TCI field value.

[0094] - The terminal receives downlink data from the base station on the PDSCH (S2203).

[0095] When a terminal detects a PDCCH including DCI format 1_0 or 1_1, it decodes the PDSCH according to the instructions of the corresponding DCI.

[0096] Here, when the terminal receives a PDSCH scheduled by DCI format 1, the terminal may be configured with a DMRS configuration type by a higher layer parameter "dmrs-Type", and the DMRS type is used to receive the PDSCH. Furthermore, the terminal may be configured with a maximum number of DMRA symbols to be front-loaded for the PDSCH by a higher layer parameter "maxLength".

[0097] For DMRS configuration type 1, if a terminal is scheduled with a single codeword and is specified with antenna ports mapped with an index of {2, 9, 10, 11, or 30}, or if a terminal is scheduled with two codewords, the terminal shall assume that all remaining orthogonal antenna ports are not associated with a PDSCH transmission to another terminal.

[0098] Alternatively, in the case of DMRS configuration type 2, if a terminal is scheduled with a single codeword, and an antenna port mapped to an index of {2, 10, or 23} is specified, or if a terminal is scheduled with two codewords, the terminal assumes that all remaining orthogonal antenna ports are not associated with a PDSCH transmission to another terminal.

[0099] When a terminal receives a PDSCH, a precoding granularity P' may be assumed to be consecutive resource blocks in the frequency domain, where P' may be one of {2, 4, wideband}.

[0100] If P' is determined to be wideband, the terminal does not expect to be scheduled on non-contiguous PRBs, and the terminal can assume that the same precoding is applied to the assigned resources.

[0101] On the other hand, if P' is determined to be one of {2, 4}, the precoding resource block group (PRG) is divided into P' consecutive PRBs. The actual number of consecutive PRBs in each PRG may be one or more. The UE may assume that the same precoding is applied to consecutive downlink PRBs in a PRG.

[0102] In order for the terminal to determine the modulation order, target code rate, and transport block size in the PDSCH, the terminal first reads the 5-bit MCD field in the DCI to determine the modulation order and target code rate. Then, the terminal reads the redundancy version field in the DCI to determine the redundancy version. The terminal then determines the transport block size using the number of layers and the total number of allocated PRBs before rate matching.

[0103] Uplink transmit and receive operations

[0104] FIG. 5 is a diagram illustrating an example of an uplink transmission / reception related procedure in a system applicable to the present disclosure.

[0105] The base station schedules uplink transmission such as frequency / time resources, transmission layer, uplink precoder, MCS, etc. (S2301). In particular, the base station can determine a beam for PUSCH transmission by the terminal through the above-mentioned operations.

[0106] - The terminal receives DCI for uplink scheduling (ie, including scheduling information for the PUSCH) from the base station on the PDCCH (S2302).

[0107] For uplink scheduling, DCI format 0_0 or 0_1 may be used. In particular, DCI format 0_1 ​​includes the following information: DCI format identifier, UL / SUL (supplementary uplink) indicator, bandwidth part indicator, frequency domain resource assignment, time domain resource assignment, frequency hopping flag, modulation and coding scheme (MCS), SRS resource indicator (SRI), precoding information and number of layers, and the number of layers. number of layers, Antenna port(s), SRS request, DMRS sequence initialization, UL-SCH (Uplink Shared Channel) indicator.

[0108] In particular, the SRS resource indicator field may indicate an SRS resource configured in an SRS resource set associated with the upper layer parameter "usage". In addition, each SRS resource may receive a "spatialRelationInfo" setting, whose value may be one of {CRI, SSB, SRI}.

[0109] - The terminal transmits uplink data to the base station on the PUSCH (S2303).

[0110] When the terminal detects a PDCCH including DCI format 0_0 or 0_1, the terminal transmits a corresponding PUSCH according to the instruction of the corresponding DCI.

[0111] For PUSCH transmission, two transmission schemes are supported: codebook-based transmission and non-codebook-based transmission.

[0112] i) When the upper layer parameter "txConfig" is set to "codebook", the terminal is configured for codebook-based transmission. On the other hand, when the upper layer parameter "txConfig" is set to "noncodebook", the terminal is configured for non-codebook-based transmission. If the upper layer parameter "txConfig" is not set, the terminal does not expect to be scheduled by DCI format0_1. When PUSCH is scheduled by DCI format0_0, PUSCH transmission is based on a single antenna port.

[0113] In the case of codebook-based transmission, the PUSCH may be scheduled with DCI format0_0, DCI format0_1, or semi-statically. When the PUSCH is scheduled with DCI format0_1, the terminal determines a PUSCH transmission precoder based on the SRI, TPMI (Transmit Precoding Matrix Indicator), and transmission rank from the DCI as given by the SRS resource indicator field and the Precoding information and number of layers field. The TPMI is used to indicate the precoder to be applied across antenna ports and corresponds to the SRS resource selected by the SRI when multiple SRS resources are configured. Alternatively, when a single SRS resource is established, the TPMI is used to indicate the precoder to be applied across antenna ports and corresponds to the corresponding single SRS resource. The transmission precoder is selected from an uplink codebook with the same number of antenna ports as the upper layer parameter "nrofSRS-Ports". When the terminal is configured with the upper layer "codebook" and the parameter "txConfig" is set, the terminal is configured with at least one SRS resource. An SRI designated in slot n relates to the most recent transmission on the SRS resource identified by the SRI, where the SRS resource precedes the PDCCH carrying the SRI (ie, slot n).

[0114] ii ) For non-codebook-based transmission, the PUSCH may be scheduled in DCI format0_0, DCI format0_1, or semi-statically. When multiple SRS resources are configured, the terminal may determine the PUSCH precoder and transmission rank based on the wideband SRI, where the SRI is given by the SRS resource indicator in the DCI or by the higher layer parameter "SRS-ResourceIndicator". The terminal uses one or multiple SRS resources for SRS transmission, where the number of SRS resources may be configured for simultaneous transmission in the same RB based on the UE capability. Only one SRS port is configured for each SRS resource. Only one SRS resource may be configured with the higher layer parameter "usage" set to "noncodebook". The maximum number of SRS resources that can be configured for noncodebook-based uplink transmission is four. The SRI indicated in slot n is associated with the most recent transmission of the SRS resource identified by the SRI, where the SRS transmission precedes the PDCCH (i.e., slot n) carrying the SRI.

[0115] SRS (sounding reference signal)

[0116] [Table 4-1] [Table 4-2] [Table 4-3] [Table 4-4] [Table 4-5] [Table 4-6] [Table 4-7] [Table 4-8] [Table 4-9] [Table 4-10]

[0117] Problems with the prior art

[0118] In Release 18 MIMO SRS discussion, discussion is planned to introduce 8-port SRS transmission. In the current standard, 1-, 2-, and 4-port SRS transmission is possible, and it is defined so that all ports can be transmitted within a single symbol. Among various port multiplexing methods, the method of applying N-symbol-based TDM and / or TD-OCC can be considered. The following are some examples.

[0119] Eg1,TDM between 0 / 1 / 2 / 3 port (eg, symbol#x) and 4 / 5 / 6 / 7 port (eg, symbol#x+1)

[0120] Eg2,TD-OCC between 0 / 1 / 2 / 3 port (eg, symbol#x) and 4 / 5 / 6 / 7 port (eg, symbol#x+1)

[0121] [Issue #1] When supporting TDM and / or TD-OCC, clarification is needed in the standard technology for the following issues:

[0122] In the current 3GPP standard, the number of SRS symbols in one slot (ie, nrofSymbols) can be set to a value of {1, 2, 4, 8, 10, 12, 14}, and the number of repeated transmissions in one slot (ie, repetitionFactor) can be set to a value of {1, 2, 4, 5, 6, 7, 8, 10, 12, 14}. When Frequency hopping is set, hopping can be performed in units of the repetitionFactor (3GPP TS38.211, 6.4.1.4.3). And, nrofSymbols and repetitionFactor can be set to a combination where nrofSymbols / repetitionFactor has an integer value (3GPP TS38.214, 6.2.1.1).

[0123] Meanwhile, when frequency hopping is set and TDM / TD-OCC is performed based on consecutive N-Symbols, clarification is required in the current standard technology on how repetitionFactor should be applied. For example, when TDM / TD-OCC is performed based on two consecutive symbols for a combination of nrofSymbols = 10 and repetitionFactor = 5, hopping occurs between the 5th and 6th symbols, and the frequency domains to be transmitted are different, so that two symbols to which TDM / TD-OCC is applied may be transmitted in different frequency domains. Therefore, when TDM / TD-OCC is applied even with frequency hopping, a method is required that can assume the same frequency domain for consecutive N-Symbols to which the TDM / TD-OCC is applied.

[0124] [Issue #2] When supporting the above (TDM and / or) TD-OCC, clarification is needed in the standard technology for the following issues:

[0125] In the current standard, symbol-based hopping is possible for the root index of the SRS sequence (i.e., groupOrSequenceHopping) (TS38.211, 6.4.1.4.2). In the case of groupHopping, hopping is possible within a set of 30 root indexes. In the case of sequenceHopping, hopping is possible between two sets of 30 root indexes (root index within a set is fixed).

[0126] Meanwhile, when groupHopping or sequenceHopping is set and (TDM / )TD-OCC is performed based on consecutive N-Symbols, it is necessary to check whether hopping should be performed within the symbol interval to which (TDM / )TD-OCC is applied. For example, when group / sequence hopping is performed, the base sequence may differ on a symbol-by-symbol basis. Therefore, when TD-OCC is applied even if group / sequence hopping is performed, a method is required to assume the same base sequence for consecutive N-Symbols to which the TD-OCC is applied.

[0127] Configurations of various embodiments of the present disclosure

[0128] FIG. 6 is a diagram illustrating an example of SRS transmission that performs frequency hopping in a system applicable to the present disclosure.

[0129] Proposal #A1: (for Issue #1) When applying TDM / TD-OCC for port multiplexing based on N consecutive symbols, a method of setting a repetitionFactor that corresponds to an integer multiple of N, and a method of interpreting the actual number of repeated transmissions as repetitionFactor / N.

[0130] In the example of FIG. 6, it is assumed that nrofSymbols = 10 and repetitionFactor = 5. Based on the current standard, frequency hopping can be performed at 5 symbol intervals. However, in this case, if 2-symbol based TDM / TD-OCC is applied, frequency hopping occurs at symbol #8 and symbol #9, and different ports multiplexed based on TDM / TD-OCC may be transmitted to different frequency domains. Therefore, problems may occur in estimating an accurate channel. On the other hand, if proposal #A1 is applied, the above situation may be prevented, and degradation of channel estimation performance may be prevented.

[0131] 7 is a diagram showing an example of SRS transmission that performs frequency hopping in a system applicable to the present disclosure. Specifically, FIG. 7 shows a method according to the current standard.

[0132] 8 is a diagram illustrating an example of SRS transmission that performs frequency hopping in a system applicable to the present disclosure. Specifically, FIG. 8 illustrates a proposed method of the present disclosure.

[0133] In the examples of Figures 7 and 8, it is assumed that nrofSymbols = 8 and repetitionFactor = 4. As shown in Figure 7, a single-symbol pattern in which all ports are defined based on the current standard can be repeatedly transmitted repetitionFactor = 4 times, and frequency hopping operation can be performed at 4-symbol intervals. Meanwhile, as shown in Figure 8, a two-symbol pattern in which all ports are defined based on the proposed method can be repeatedly transmitted repetitionFactor / N = 2 times, and frequency hopping operation can be performed at repetitionFactor = 4 symbol intervals.

[0134] The technical effect of the method of Fig. 8 according to Proposal #A1 is that an integer number of N-Symbols that can be bound to port multiplexing within the repetitionFactor can be defined. Therefore, even when frequency hopping is performed, N-Symbols can be transmitted in the same frequency region.

[0135] On the other hand, in addition to the proposal #A1, or by replacing a part of the proposal #A1, the following proposed method can be applied.

[0136] Fig. 9 is a diagram showing an example of SRS transmission that performs frequency hopping in a system applicable to the present disclosure. Specifically, Fig. 9 shows a first proposed method that applies the following proposal #A1-a.

[0137] Fig. 10 is a diagram showing an example of SRS transmission that performs frequency hopping in a system applicable to the present disclosure. Specifically, Fig. 10 shows a second proposed method that applies the following proposal #A1-a.

[0138] Proposal #A1-a: When applying TDM / TD-OCC for port multiplexing based on N consecutive symbols, if repetitionFactor / N is not divisible, the number of actual repeated transmissions is interpreted as floor<repetitionFactor / N) and / or floor (repetitionFactor / N)+1.

[0139] In the examples of Figures 9 and 10, we assume that nrofSymbols = 10 and repetitionFactor = 5. When operating based on the current standard, frequency hopping operation can be performed as in the example of Figure 8. As shown in Figures 9 and 10, a two-symbol pattern defined for all ports based on the proposed method can be transmitted three times, floor(repetitionFactor / N) and / or floor(repetitionFactor / N), and / or N. *floor(repetitionFactor / N) and / or N * Frequency hopping operation can be performed at intervals of floor(repetitionFac+ 1 = 2 tor / N)+1 = 4 and / or 6 symbols.

[0140] In Proposal #A1-a, "floor(repetitionFactor / N) and / or floor(repetitionFactor / N)+1" is a method for enabling N-Symbols for which all ports are defined to be transmitted in the same frequency region even when frequency hopping is performed, and does not limit the proposed method, so it is clear that other formulas can also be applied to apply the proposed method.

[0141] The technical effect of the methods of Figures 9 and 10 relating to Proposal #A1-a is that, while maintaining the concept of nrofSymbols defined in the current standard, N-Symbols for which all ports are defined can be transmitted in the same frequency region even when frequency hopping is performed.

[0142] 11 is a diagram showing an example of SRS transmission that performs frequency hopping in a system applicable to the present disclosure. Specifically, FIG. 11 shows a method according to the current standard.

[0143] Fig. 12 is a diagram showing an example of SRS transmission that performs frequency hopping in a system applicable to the present disclosure. Specifically, Fig. 12 shows a proposed method to which the following proposal #A1-1 is applied.

[0144] Proposal #A1-1: When applying TDM / TD-OCC for port multiplexing based on consecutive N-Symbols, a method of interpreting the actual number of repeated transmissions of the N-Symbol pair as repetitionFactor, a method of interpreting the actual number of SRS symbols (i.e., nrofSymbols) as nrofSymbols*N, and a method of interpreting nrofSymbols*N<=14 and / or startPosition+1-nrofSymbols * A method to set N >= 0.

[0145] In the examples of Figs. 11 and 12, it is assumed that nrofSymbols = 4 and repetitionFactor = 2. As shown in Fig. 11, a single-symbol pattern for which all ports are defined according to the current standard can be repeatedly transmitted repetitionFactor = 2 times, resulting in a total of 4 symbols being transmitted within one slot. On the other hand, as shown in Fig. 12, a two-symbol pattern for which all ports are defined according to the proposed method can be repeatedly transmitted repetitionFactor = 2 times, resulting in a total of 1 nrofSymbols * N=8 symbols can be transmitted.

[0146] In Proposal #A1-1, "nrofSymbols*N<=14 and / or startPosition+1-nrofSymbols*N>=0" does not limit the proposed method as a method for enabling all SRS symbols defined based on the proposed method to be defined within a single slot, so it is clear that other formulas can also be applied to apply the proposed method.

[0147] 13 is a diagram illustrating an example of SRS transmission with group / sequence hopping in a system applicable to the present disclosure. Specifically, FIG. 13 illustrates a method according to the current standard.

[0148] Fig. 14 is a diagram showing an example of SRS transmission that performs group / sequence hopping in a system applicable to the present disclosure. Specifically, Fig. 14 shows a proposed method that applies the following proposal #A2.

[0149] Proposal #A2: (for Issue #2) When applying (TDM / )TD-OCC for port multiplexing based on N consecutive symbols and performing group / sequence hopping, a method of performing group / sequence hopping within the N symbols using a root index generated based on a specific symbol position within the N symbols.

[0150] In the proposal, the first / last / n-th symbol can be considered as an example of a "specific symbol position within an N-symbol". The specific symbol position can be defined between a base station and a terminal by a fixed rule, or a specific value can be set / indicated to a terminal based on L1 / L2 signaling. The specific symbol position can be an example for performing group / sequence hopping in an N-symbol unit to which (TDM / )TD-OCC is applied, and does not limit the proposed method, so it is clear that group / sequence hopping can be performed in the N-symbol unit based on other indexes to apply the proposed method. For example, it can be defined to perform group / sequence hopping based on a certain kind of index defined in an N-symbol unit.

[0151] In the examples of Figures 13 and 14, we assume nrofSymbols=4 and group hopping. As shown in Figure 13, the group hopping operation can be performed every symbol based on the current standard. Meanwhile, as shown in Figure 14, the group hopping operation can be performed based on the first symbol position in N-Symbol based on the proposed method. In this case, the same group can be applied within N-Symbol.

[0152] The same base sequence of the root index can be maintained within the N-symbols bound by port multiplexing. In other words, the operation of group / sequence hopping for each symbol in the current standard can be performed in units of N-symbols to which (TDM / )TD-OCC is applied through the above-mentioned proposal #A2.

[0153] The proposed methods (e.g., Proposal #A1 / #Aa / #A1-1 / #A2, etc.) may be applied independently and / or together. When multiple methods are applied together, signaling (e.g., L1 / L2 signaling) may be introduced to configure / indicate the specific method.

[0154] Signaling Procedures of Various Embodiments of the Disclosure

[0155] FIG. 15 is a diagram showing a signal flow chart between a terminal and a base station in a system applicable to the present disclosure.

[0156] FIG. 15 illustrates signaling between a base station and a user equipment (UE) to which the method proposed in the present disclosure (e.g., proposal #A1 / #A1-a / #A1-1 / #A2, etc.) may be applied. (Here, the UE / base station is merely an example, and may be alternatively applied to various devices such as those described in FIG. 18). FIG. 15 is for convenience of explanation only, and does not limit the scope of the present invention. Also, some steps illustrated in FIG. 15 may be omitted depending on the situation and / or settings, etc. Also, it goes without saying that the order of some steps illustrated in FIG. 15 may be changed. In the operation of the base station and UE in FIG. 15, the above-mentioned technical contents (e.g., SRS-related operations, etc.) may be referred to / used.

[0157] The base station may be a collective term for an object that transmits and receives data to and from a terminal. For example, the base station may be a concept including one or more TPs (Transmission Points), one or more TRPs (Transmission and Reception Points), etc. Furthermore, the TP and / or TRP may include a panel of the base station, a transmission and reception unit, etc. In addition, the term "TRP" may be applied by replacing it with expressions such as a panel, an antenna array, a cell (e.g., macro cell / small cell / pico cell, etc.), a TP (transmission point), a base station (gNB), etc. As described above, the TRP may be classified according to information (e.g., index, ID) regarding the CORESET group (or CORESET pool). As an example, if one terminal is configured to transmit and receive data to and from multiple TRPs (or cells), this may mean that multiple CORESET groups (or CORESET pools) are configured for one terminal. Such configuration of a CORESET group (or CORESET pool) may be performed via higher layer signaling (eg, RRC signaling, etc.).

[0158] The UE may report a terminal capability report (UE capability report), for example, UE capability information, related to a proposal method (eg, proposal #A1 / #A1-a / #A1-1 / #A2, etc.) to the base station (S3410).

[0159] The UE may receive configuration information related to a proposed method (e.g., proposal #A1 / #A1-a / #A1-1 / #A2, etc.) from the base station (S3420). The N configuration information may include all settings / instructions based on L1 / L2 signaling. And / or, if the configuration information is predefined or configured, the corresponding step may be omitted.

[0160] For example, the operation of the UE transmitting the configuration information from the base station in step S3420 described above can be implemented by the apparatus of FIG. 18 described below.

[0161] For example, the above-mentioned operation of the base station transmitting the configuration information to the UE in step S3420 can be realized by the device of FIG. 18 described below.

[0162] The UE may transmit a sounding reference signal (SRS) to the base station (S3430). The UE may perform the SRS transmission operation based on the configuration information (configuration) of S3420. For example, the UE may perform the SRS transmission operation based on a proposal method (e.g., proposal #A1 / #A1-a / #A1-1 / #A2, etc.).

[0163] The base station may estimate the DL / UL channel based on the SRS received from the UE (S3440).

[0164] The base station may set / instruct data scheduling information for the corresponding UE based on the estimated channel value (S3450). The data scheduling information may be determined based on the DL / UL channel value estimated in S3440.

[0165] As described above, the signaling and operations between the base station and the UE (e.g., proposals #A1 / #A1-a / #A1-1 / #A2 / FIG. 15, etc.) can be realized by the following device (FIG. 18). For example, the base station can be the first device and the UE can be the second device, and vice versa in some cases.

[0166] For example, the above-mentioned base station / UE signaling and operations (e.g., proposals #A1 / #A1-a / #A1-1 / #A2 / FIG. 15, etc.) may be processed by one or more processors 1610, 1670 of FIG. 18, and the above-mentioned base station / UE signaling and operations (e.g., proposals #A1 / #A1-a / #A1-1 / #A2 / FIG. 15, etc.) may also be stored in a memory (e.g., one or more memories (1640, 1690) of FIG. 18) in the form of instructions / programs (e.g., instructions, executable code) for driving one or more processors 1610, 1670 of FIG. 18.

[0167] "Terminal claim related explanation"

[0168] Hereinafter, the above-mentioned embodiment will be described in detail from the viewpoint of the operation of the terminal with reference to Fig. 16. The methods described below are only divided for the convenience of explanation, and it goes without saying that a part of any one method may be replaced with a part of another method or may be combined with each other to be applied, unless mutually exclusive.

[0169] FIG. 16 is a diagram showing an example of an operation process of a terminal in a system applicable to the present disclosure.

[0170] In step S3510, the terminal receives SRS configuration information including a repetitionFactor, which is the number of times an SRS (Sounding Reference Signal) is repeatedly transmitted within one slot, and nrofSymbols, which is the number of symbols related to the SRS within one slot, from the base station.

[0171] In step S3520, the terminal determines one or more of the number of times L or M for repeated transmission of the SRS based on the number N of consecutive symbols associated with the transmission of the SRS and the repetitionFactor.

[0172] In step S3530, the terminal repeats the operation of transmitting the SRS to the base station for every N consecutive symbols in the first frequency domain L times.

[0173] In step S3540, the terminal repeats the operation of transmitting the SRS to the base station for every N consecutive symbols in the second frequency domain L or M times.

[0174] According to various embodiments of the present disclosure, the transmission of the SRS may be associated with multiple antenna ports within the terminal.

[0175] According to various embodiments of the present disclosure, the time resource regions associated with each of the multiple antenna ports may be allocated within N consecutive symbols without overlapping with each other.

[0176] According to various embodiments of the present disclosure, L may be (repetitionFactor / N). After transmitting the SRS L times in the first frequency domain, L transmissions of the SRS may be performed in the second frequency domain, which is different from the first frequency domain, in a continuous time domain.

[0177] According to various embodiments of the present disclosure, L is N * floor(repetitionFactor / N), and M may be N*[floor(repetitionFactor / N)+1], or L may be N*[floor(repetitionFactor / N)+1], and M may be N*floor(repetitionFactor / N).

[0178] According to various embodiments of the present disclosure, the SRS is transmitted in nrofSymbols symbols in one slot, and among the nrofSymbols symbols (N * At the (L+1)th symbol, frequency hopping may be performed from the first frequency region to the second frequency region.

[0179] According to various embodiments of the present disclosure, nrofSymbols*N <= 14, and startPosition + 1 - nrofSymbols * N >= 0, and the startPosition may be the position of the symbol at which the Lth transmission of the SRS in the first frequency domain starts among the 14 symbols in one symbol.

[0180] According to various embodiments of the present disclosure, L is a repetition factor, and after L transmissions of the SRS in the first frequency domain, L transmissions of the SRS may be performed in the second frequency domain, which is different from the first frequency domain, in a continuous time domain.

[0181] According to various embodiments of the present disclosure, the SRS may be transmitted in nrofSymbols symbols in one slot. Group hopping or sequence hopping may be performed in units of N symbols from the first symbol among the nrofSymbols symbols. The same frequency band pattern and the starting point of the same frequency band sequence may be applied to a group of terminals including the terminal within the N symbols.

[0182] According to various embodiments of the present disclosure, a terminal in a wireless communication system is provided, the terminal including a transceiver and at least one processor, the at least one processor may be configured to perform the method of operating the terminal according to FIG.

[0183] According to various embodiments of the present disclosure, there is provided an apparatus for controlling a terminal in a communication system, the apparatus including at least one processor and at least one memory operatively connected to the at least one processor, the at least one memory being configured to store instructions for performing the method of operating the terminal according to FIG.

[0184] According to various embodiments of the present disclosure, one or more non-transitory computer readable mediums (CRMs) are provided that store one or more instructions, the one or more instructions being executed by one or more processors to perform operations, the operations including the method of operating the terminal according to FIG.

[0185] [Explanation regarding base station claims]

[0186] Hereinafter, the above-mentioned embodiment will be described in detail from the viewpoint of the operation of a base station with reference to Fig. 17. The methods described below are only divided for the convenience of explanation, and it is understood that some configurations of any one method can be replaced with some configurations of other methods or can be combined with each other and applied, unless mutually exclusive.

[0187] FIG. 17 is a diagram illustrating an example of an operation process of a base station in a system applicable to the present disclosure.

[0188] In step S3610, the base station may transmit SRS configuration information to the terminal, including repetitionFactor, which is the number of times an SRS (sounding reference signal) is repeatedly transmitted in one slot, and nrofSymbols, which is the number of symbols related to the SRS in one slot.

[0189] In step S3620, the base station may repeat the operation of receiving the SRS for every N consecutive symbols in the first frequency domain from the terminal L times.

[0190] In step S3630, the base station may repeat the operation of receiving the SRS from the terminal for every N consecutive symbols in the second frequency domain L or M times.

[0191] According to various embodiments of the present disclosure, N may be the number of consecutive symbols associated with the transmission of the SRS.

[0192] According to various embodiments of the present disclosure, L and M may be the number of times for repeated transmission of the SRS based on the repetitionFactor.

[0193] According to various embodiments of the present disclosure, reception of the SRS may be associated with multiple antenna ports within the base station.

[0194] According to various embodiments of the present disclosure, time resource regions associated with each of the multiple antenna ports may be allocated within the N consecutive symbols without overlapping with each other.

[0195] According to various embodiments of the present disclosure, L may be (repetitionFactor / N). After receiving the SRS L times in the first frequency domain, reception of the SRS L times in the second frequency domain different from the first frequency domain may be performed in a continuous time domain.

[0196] According to various embodiments of the present disclosure, L is N*floor(repetitionFactor / N), and M is N * [floor(repetitionFactor / N)+1], or L can be N*[floor(repetitionFactor / N)+1] and M can be N*floor(repetitionFactor / N).

[0197] According to various embodiments of the present disclosure, the SRS may be received in nrofSymbols symbols in one slot, and frequency hopping may be performed from a first frequency domain to a second frequency domain in the (N*L+1)th symbol of the nrofSymbols symbols.

[0198] According to various embodiments of the present disclosure, nrofSymbols *N may be <= 14. startPosition+1-nrofSymbols*N may be >= 0. The startPosition may be a symbol position at which the Lth transmission of the SRS starts in the first frequency domain among 14 symbols in one symbol.

[0199] According to various embodiments of the present disclosure, L may be a repetition factor. After receiving the SRS L times in the first frequency domain, reception of the SRS L times in the second frequency domain different from the first frequency domain may be performed in a continuous time domain.

[0200] According to various embodiments of the present disclosure, the SRS may be received in nrofSymbols symbols in one slot. Among the nrofSymbols symbols, group hopping or sequence hopping may be performed in units of N symbols from the first symbol. The same frequency band sequence starting point and the same frequency band pattern may be applied to a group of terminals including the terminal within the N symbols.

[0201] According to various embodiments of the present disclosure, there is provided a base station in a wireless communication system, the base station including a transceiver and at least one processor, the at least one processor may be configured to perform the method of operating the base station according to FIG.

[0202] According to various embodiments of the present disclosure, there is provided an apparatus for controlling a base station in a wireless communication system, the apparatus including at least one processor and at least one memory operatively connected to the at least one processor, the at least one memory being configured to store instructions for performing the method of operating a base station according to FIG.

[0203] According to various embodiments of the present disclosure, one or more non-transitory computer readable mediums (CRMs) are provided that store one or more instructions that, when executed by one or more processors, perform operations, where the operations may include the method of operating a base station according to FIG.

[0204] Wireless Devices Applicable to the Present Disclosure

[0205] In the following, an example of a wireless device to which various embodiments of the present disclosure may be applied is described.

[0206] FIG. 18 is a diagram illustrating an example of the structure of a first device and a second device in a system applicable to the present disclosure.

[0207] The first device 1600 may include a processor 1610, an antenna unit 1620, a transceiver 1630, and a memory 1640.

[0208] The processor 1610 performs baseband-related signal processing and may include an upper layer processing unit 1611 and a physical layer processing unit 1615. The upper layer processing unit 1611 may process operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 1615 may process operations of the PHY layer. For example, when the first device 1600 is a base station device in base station-terminal communication, the physical layer processing unit 1615 may perform uplink reception signal processing, downlink transmission signal processing, etc. For example, when the first device 1600 is a first terminal device in terminal-terminal communication, the physical layer processing unit 1615 may perform downlink reception signal processing, uplink transmission signal processing, sidelink transmission signal processing, etc. In addition to performing baseband-related signal processing, the processor 1610 may also control the operation of the entire first device 1600.

[0209] The antenna unit 1620 may include one or more physical antennas, and when multiple antennas are included, it may support MIMO transmission and reception. The transceiver 1630 may include a radio frequency (RF) transmitter and an RF receiver. The memory 1640 may store information processed by the processor 1610, software related to the operation of the first device 1600, an operating system, applications, etc., and may include components such as a buffer.

[0210] The processor 1610 of the first device 1600 may be configured to implement the operation of a base station in base station-terminal communication (or the operation of a first terminal device in terminal-terminal communication) in the embodiments described in this disclosure.

[0211] The second device 1650 may include a processor 1660, an antenna portion 1670, a transceiver 1680, and a memory 1690.

[0212] The processor 1660 performs baseband-related signal processing and may include an upper layer processing unit 1661 and a physical layer processing unit 1665. The upper layer processing unit 1661 may process operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 1665 may process operations of the PHY layer. For example, when the second device 1650 is a terminal device in a base station-terminal communication, the physical layer processing unit 1665 may perform downlink reception signal processing, uplink transmission signal processing, etc. For example, when the second device 1650 is a second terminal device in a terminal-terminal communication, the physical layer processing unit 1665 may perform downlink reception signal processing, uplink transmission signal processing, sidelink reception signal processing, etc. In addition to performing baseband-related signal processing, the processor 1660 may also control the operation of the second device 1660 in general.

[0213] The antenna unit 1670 may include one or more physical antennas, and when multiple antennas are included, MIMO transmission and reception may be supported. The transceiver 1680 may include an RF transmitter and an RF receiver. The memory 1690 may store information processed by the processor 1660, software related to the operation of the second device 1650, an operating system, applications, etc., and may include components such as a buffer.

[0214] The processor 1660 of the second device 1650 may be configured to implement the operation of a terminal in base station-terminal communication (or the operation of a second terminal device in terminal-terminal communication) in the embodiments described in this disclosure.

[0215] The matters described in the examples of the present disclosure regarding the base station and terminal in base station-terminal communication (or the first terminal and second terminal in terminal-terminal communication) in the operation of the first device 1600 and the second device 1650 may be similarly applied, and duplicated explanations will be omitted.

[0216] Here, the wireless communication technology realized by the devices 1600 and 1650 of the present disclosure may include not only LTE, NR, and 6G, but also Narrowband Internet of Things (NB-IoT) for low power communication. For example, the NB-IoT technology may be an example of a Low Power Wide Area Network (LPWAN) technology, and may be realized by standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above names.

[0217] Additionally or alternatively, the wireless communication technology implemented in the devices 1600, 1650 of the present disclosure may perform communication based on LTE-M technology. For example, the LTE-M technology may be an example of LPWAN technology and may be referred to by various names such as eMTC (enhanced Machine Type Communication). For example, the LTE-M technology may be implemented in at least one of various standards such as 1) LTE CAT 0, 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, and is not limited to the above names.

[0218] Additionally or alternatively, the wireless communication technology implemented in the devices 1600, 1650 of the present disclosure may include, but is not limited to, ZigBee, Bluetooth, and / or Low Power Wide Area Network (LPWAN), which allow for low power communication. For example, ZigBee technology may create personal area networks (PANs) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and may be referred to by various names.

[0219] The claims described in the various embodiments of the present disclosure may be combined in various ways. For example, the technical features of the method claims of the various embodiments of the present disclosure may be combined and realized as an apparatus, and the technical features of the device claims of the various embodiments of the present disclosure may be combined and realized as a method. Furthermore, the technical features of the method claims and the technical features of the device claims of the various embodiments of the present disclosure may be combined and realized as an apparatus, and the technical features of the method claims and the technical features of the device claims of the various embodiments of the present disclosure may be combined and realized as a method.

Claims

1. A method for operating a terminal in a wireless communication system, comprising: Receiving SRS configuration information including a repetitionFactor, which is a number of times a sounding reference signal (SRS) is repeatedly transmitted in one slot, and nrofSymbols, which is a number of symbols related to the SRS in one slot, from a base station; determining one or more of a number L or M for repeated transmission of the SRS based on a number N of consecutive symbols associated with the transmission of the SRS and the repetitionFactor; repeating an operation of transmitting the SRS to the base station every N consecutive symbols in a first frequency domain L times; Repeating an operation of transmitting the SRS to the base station every N consecutive symbols in a second frequency domain L or M times; The transmission of the SRS is associated with multiple antenna ports in the terminal; A method according to claim 1, wherein time resource regions associated with each of the plurality of antenna ports are allocated within the N consecutive symbols without overlapping with each other.

2. The L is (repetitionFactor / N), The method of claim 1 , further comprising transmitting the SRS L times in the first frequency domain, followed by transmitting the SRS L times in a second frequency domain different from the first frequency domain in a continuous time domain.

3. The L is N ＊ floor(repetitionFactor / N), where M is N ＊ [floor(repetitionFactor / N)+1] or The L is N ＊ [floor(repetitionFactor / N)+1], where M is N ＊ The method of claim 1 , wherein the repetition factor is floor(repetitionFactor / N).

4. The SRS is transmitted in nrofSymbols symbols in one slot, The method of claim 1 , wherein frequency hopping occurs from the first frequency region to the second frequency region at an (N*L+1)th symbol of the nrofSymbols symbols.

5. nrofSymbols * N <= 14, startPosition+1-nrofSymbols*N >= 0, The method of claim 1 , wherein the startPosition is a position of a symbol at which L transmissions of the SRS start in the first frequency region among 14 symbols in one symbol.

6. The L is (repetitionFactor), The method of claim 5 , wherein after L transmissions of the SRS in the first frequency domain, L transmissions of the SRS are performed in the second frequency domain, which is different from the first frequency domain, in consecutive time domains.

7. The SRS is transmitted in nrofSymbols symbols in one slot, Group hopping or sequence hopping is performed in units of N symbols from the first symbol among the nrofSymbols symbols, The method of claim 1 , wherein within the N symbols, a same frequency band sequence starting point and a same frequency band pattern are applied to a group of terminals including the terminal.

8. 1. A method of operating a base station in a wireless communication system, comprising: Transmitting SRS configuration information to the terminal, the SRS configuration information including a repetitionFactor, which is a number of times that a sounding reference signal (SRS) is repeatedly transmitted in one slot, and a number of symbols related to the SRS in one slot, nrofSymbols; repeating an operation of receiving the SRS for every N consecutive symbols in a first frequency domain from the terminal L times; Repeating an operation of receiving the SRS from the terminal for every N consecutive symbols in a second frequency domain L or M times; N is the number of consecutive symbols associated with the transmission of the SRS; L and M are the number of times for repeated transmission of the SRS based on the repetitionFactor, Reception of the SRS is associated with a plurality of antenna ports within the base station; A method in which time resource regions associated with each of the plurality of antenna ports are allocated within the N consecutive symbols without overlapping with each other.

9. The L is (repetitionFactor / N), The method of claim 8 , wherein after receiving the SRS L times in the first frequency domain, receiving the SRS L times in the second frequency domain different from the first frequency domain in a continuous time domain.

10. The L is N ＊ floor(repetitionFactor / N), where M is N ＊ [floor(repetitionFactor / N)+1], or The L is N ＊ [floor(repetitionFactor / N)+1], where M is N ＊ The method of claim 8, wherein the repetition factor is floor(repetitionFactor / N).

11. The SRS is received in nrofSymbols symbols in one slot, Of the nrofSymbols symbols, (N ＊ 9. The method of claim 8, wherein frequency hopping occurs from the first frequency region to the second frequency region at the (L+1)th symbol.

12. nrofSymbols ＊ N <= 14, startPosition+1-nrofSymbols ＊ N >= 0, The method according to claim 8 , wherein the startPosition is a position of a symbol at which L transmissions of the SRS start in the first frequency region among 14 symbols in one symbol.

13. The L is (repetitionFactor), The method of claim 12 , further comprising receiving the SRS L times in a first frequency domain, followed by receiving the SRS L times in a second frequency domain different from the first frequency domain in a consecutive time domain.

14. The SRS is received in nrofSymbols symbols in one slot, Group hopping or sequence hopping is performed in units of N symbols from the first symbol among the nrofSymbols symbols, The method of claim 8, wherein within the N symbols, a same frequency band sequence starting point and a same frequency band pattern are applied to a group of terminals including the terminal.

15. In a terminal in a wireless communication system, A transceiver; At least one processor; at least one memory operatively connected to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations; The operation includes: The method according to any one of claims 1 to 7, comprising all the steps of the method. Terminal.

16. In a base station in a wireless communication system, A transceiver; At least one processor; at least one memory operatively connected to the at least one processor and storing instructions for performing operations when executed by the at least one processor; The operation includes: The method according to any one of claims 8 to 14, comprising all the steps of the method. Base station.

17. A control device for controlling a terminal in a wireless communication system, At least one processor; at least one memory operatively connected to the at least one processor; the at least one memory stores instructions for performing operations based on being executed by the at least one processor; The operation includes: The method according to any one of claims 1 to 7, comprising all the steps of the method. Control device.

18. A control device for controlling a base station in a wireless communication system, At least one processor; at least one memory operatively connected to the at least one processor; the at least one memory stores instructions for performing operations based on being executed by the at least one processor; The operation includes: The method according to any one of claims 8 to 14, comprising all the steps of the method. Control device.

19. One or more non-transitory computer-readable media storing one or more instructions, the one or more instructions perform operations upon being executed by one or more processors; The operation includes: The method according to any one of claims 1 to 7, comprising all the steps of the method. Computer-readable medium.

20. One or more non-transitory computer-readable media storing one or more instructions, the one or more instructions perform operations upon being executed by one or more processors; The operation includes: A computer readable medium comprising all the steps of the method according to any one of claims 8 to 14.

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