WO2024158253A1 - Procédé de transmission et de réception de signal de référence de sondage dans un système de communication sans fil, et appareil associé - Google Patents

Procédé de transmission et de réception de signal de référence de sondage dans un système de communication sans fil, et appareil associé Download PDF

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WO2024158253A1
WO2024158253A1 PCT/KR2024/001287 KR2024001287W WO2024158253A1 WO 2024158253 A1 WO2024158253 A1 WO 2024158253A1 KR 2024001287 W KR2024001287 W KR 2024001287W WO 2024158253 A1 WO2024158253 A1 WO 2024158253A1
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symbols
srs
ports
symbol
processors
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PCT/KR2024/001287
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English (en)
Korean (ko)
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유준혁
고성원
강지원
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path

Definitions

  • This specification relates to a method and device for transmitting and receiving a sounding reference signal in a wireless communication system.
  • Mobile communication systems were developed to provide voice services while ensuring user activity.
  • mobile communication systems have expanded their scope to include not only voice but also data services.
  • the explosive increase in traffic is causing a shortage of resources and users are demanding higher-speed services, so a more advanced mobile communication system is required. .
  • next-generation mobile communication system The requirements for the next-generation mobile communication system are to support explosive data traffic, a dramatic increase in transmission rate per user, a greatly increased number of connected devices, very low end-to-end latency, and high energy efficiency.
  • dual connectivity massive MIMO (Massive Multiple Input Multiple Output), full duplex (In-band Full Duplex), NOMA (Non-Orthogonal Multiple Access), and ultra-wideband (Super)
  • massive MIMO Massive Multiple Input Multiple Output
  • full duplex In-band Full Duplex
  • NOMA Non-Orthogonal Multiple Access
  • Super ultra-wideband
  • Uplink 8 Tx transmission is supported according to Rel-18 MIMO SRS enhancement.
  • 8-port SRS is supported for the uplink 8 Tx transmission (e.g., PUSCH transmission based on up to 8 layers/8 antenna ports).
  • an 8 port SRS resource may be set in the terminal. Eight ports can be divided into two symbols and mapped.
  • the purpose of this specification is to propose a method for solving the above-mentioned problems.
  • a method performed by a terminal in a wireless communication system includes receiving configuration information related to a sounding reference signal (SRS) and transmitting the SRS based on SRS resources.
  • SRS sounding reference signal
  • the configuration information includes information about SRS resources.
  • a plurality of symbols are set in the SRS resource.
  • Eight ports are time division mapped to the plurality of symbols.
  • the plurality of symbols are characterized in that they are dropped based on at least one of the plurality of symbols overlapping with a symbol related to another uplink signal.
  • the eight ports can be divided into two subsets, and each subset with four ports can be mapped to a different symbol.
  • the plurality of symbols may be based on two symbols to which the two subsets are mapped.
  • Ports of the first subset of the eight ports may be mapped to a symbol based on an even symbol index among the two symbols.
  • Ports of the second subset of the eight ports may be mapped to a symbol based on an odd symbol index among the two symbols.
  • the ports of the first subset may be based on four port indices among port indices 1000 to 1007.
  • the ports of the second subset may be based on the remaining four port indices among the port indices 1000 to 1007.
  • the usage of the SRS resource set to which the SRS resource belongs can be set to antenna switching or codebook.
  • the number of symbols set in the SRS resource may be 2, 4, 8, 10, 12, or 14.
  • the plurality of symbols may be one of one or more symbol groups based on the number of symbols.
  • Each of the one or more symbol groups may include two symbols to which two subsets are mapped based on the partition of the eight ports.
  • the other uplink signal may include at least one of a physical uplink control channel (PUCCH) or a sounding reference signal (SRS).
  • PUCCH physical uplink control channel
  • SRS sounding reference signal
  • the method further includes receiving downlink control information (DCI) for scheduling of a physical uplink shared channel (PUSCH) and transmitting the PUSCH based on the DCI. can do.
  • DCI downlink control information
  • One or more ports associated with the PUSCH may be the same as one or more ports indicated based on the DCI.
  • the plurality of symbols or the at least one symbol may be dropped.
  • the indicated one or more ports may be based on ports excluding ports mapped to the at least one symbol among the eight ports.
  • a terminal operating in a wireless communication system includes one or more transceivers, one or more processors, and one or more memories connected to the one or more processors and storing instructions.
  • the instructions based on execution by the one or more processors, configure the one or more processors to perform all steps of the method according to any one of the methods.
  • a device includes one or more memories and one or more processors connected to the one or more memories.
  • the one or more memories store instructions that, based on execution by the one or more processors, configure the one or more processors to perform all steps of the method according to any one of the methods. It is characterized by
  • One or more non-transitory computer readable media stores instructions according to another embodiment of the present disclosure.
  • the instructions executable by one or more processors are characterized in that they configure the one or more processors to perform all steps of the method according to any one of the methods.
  • a method performed by a base station in a wireless communication system includes transmitting configuration information related to a sounding reference signal (SRS) and receiving the SRS based on SRS resources. Includes steps.
  • SRS sounding reference signal
  • the configuration information includes information about SRS resources.
  • a plurality of symbols are set in the SRS resource.
  • Eight ports are time division mapped to the plurality of symbols.
  • the plurality of symbols are characterized in that they are dropped based on at least one of the plurality of symbols overlapping with a symbol related to another uplink signal.
  • a base station operating in a wireless communication system includes one or more transceivers, one or more processors, and one or more memories connected to the one or more processors and storing instructions.
  • the instructions based on execution by the one or more processors, configure the one or more processors to perform all steps of the method.
  • eight ports are mapped to a plurality of symbols, and based on some symbols among the plurality of symbols overlapping with symbols related to other uplink channels/signals, the plurality of symbols are It is dropped.
  • the reliability of PUSCH transmission and reception operations performed after the corresponding SRS transmission can be improved.
  • the antenna port(s)/beam (spatial domain filter) most suitable for the channel condition can be used. That is, the antenna port(s)/beam (spatial domain filter) most suitable for the channel condition can be determined/instructed based on the DCI scheduling the PUSCH.
  • Figure 1 is a flowchart showing an example of a UL BM procedure using SRS.
  • Figure 2 is a diagram illustrating flexible aperiodic SRS transmission timing control.
  • Figure 3 is a diagram illustrating partial band SRS transmission.
  • Figure 4 is a flowchart to explain a method performed by a terminal according to an embodiment of the present specification.
  • Figure 5 is a flowchart to explain a method performed by a base station according to another embodiment of the present specification.
  • Figure 6 is a diagram showing the configuration of a first device and a second device according to an embodiment of the present specification.
  • downlink refers to communication from the base station to the terminal
  • uplink refers to communication from the terminal to the base station
  • DL downlink
  • UL uplink
  • the transmitter may be part of the base station and the receiver may be part of the terminal.
  • the transmitter may be part of the terminal and the receiver may be part of the base station.
  • the base station may be represented as a first communication device
  • the terminal may be represented as a second communication device.
  • a base station (BS) is a fixed station, Node B, evolved-NodeB (eNB), Next Generation NodeB (gNB), base transceiver system (BTS), access point (AP), and network (5G).
  • eNB evolved-NodeB
  • gNB Next Generation NodeB
  • BTS base transceiver system
  • AP access point
  • 5G network
  • the terminal may be fixed or mobile, and may include UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), and AMS (Advanced Mobile).
  • UE User Equipment
  • MS Mobile Station
  • UT user terminal
  • MSS Mobile Subscriber Station
  • SS Subscriber Station
  • AMS Advanced Mobile
  • MTC Machine-Type Communication
  • M2M Machine-to-Machine
  • D2D Device-to-Device
  • vehicle robot
  • AI module drone (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) device, VR (Virtual Reality) device, etc.
  • the terminal can receive one or more Sounding Reference Symbol (SRS) resource sets (via higher layer signaling, RRC signaling, etc.) set by (higher layer parameter) SRS-ResourceSet.
  • SRS Sounding Reference Symbol
  • the UE may be configured with K ⁇ 1 SRS resources (higher later parameter SRS-resource).
  • K is a natural number, and the maximum value of K is indicated by SRS_capability.
  • Figure 1 is a flowchart showing an example of a UL BM procedure using SRS.
  • the terminal receives RRC signaling (e.g. SRS-Config IE) including usage parameters from the base station (S110).
  • RRC signaling e.g. SRS-Config IE
  • the usage parameter may be set to ‘beam management’, ‘codebook’, ‘nonCodebook’, or ‘antennaSwitching’.
  • Table 1 shows an example of SRS-Config IE (Information Element), and SRS-Config IE is used for SRS transmission settings.
  • SRS-Config IE includes a list of SRS-Resources and a list of SRS-ResourceSets. Each SRS resource set means a set of SRS-resources.
  • the network can trigger transmission of the SRS resource set using the configured aperiodicSRS-ResourceTrigger (L1 DCI).
  • usage indicates a higher layer parameter indicating whether the SRS resource set is used for beam management, codebook-based or non-codebook-based transmission.
  • 'spatialRelationInfo' is a parameter that indicates the setting of spatial relation between reference RS and target SRS.
  • the reference RS can be SSB, CSI-RS, or SRS corresponding to the L1 parameter 'SRS-SpatialRelationInfo'.
  • the usage is set for each SRS resource set.
  • the terminal determines the Tx beam for the SRS resource to be transmitted based on the SRS-SpatialRelation Info included in the SRS-Config IE (S120).
  • SRS-SpatialRelation Info is set for each SRS resource and indicates whether to apply the same beam as the beam used in SSB, CSI-RS, or SRS for each SRS resource.
  • SRS-SpatialRelationInfo may or may not be set in each SRS resource.
  • SRS-SpatialRelationInfo is set in the SRS resource, the same beam as that used in SSB, CSI-RS or SRS is applied and transmitted. However, if SRS-SpatialRelationInfo is not set in the SRS resource, the terminal randomly determines the Tx beam and transmits SRS through the determined Tx beam (S130).
  • the terminal may or may not receive feedback about the SRS from the base station (S140).
  • At least one of the operations of the terminal/base station based on S110 to S140 described above is combined with embodiments related to Rel-18 SRS enhancement (e.g., at least one of Proposal 1, Proposal 2, and/or Proposal 3) described later. It can be applied.
  • an NR terminal that supports DL rank 8 transmission must be equipped with at least 8 receiving antennas, and the SRS antenna change transmission technique to estimate the DL channel based on channel reciprocity in the NR TDD system requires a terminal with up to 4 receiving antennas. Support was provided only up to. Therefore, Rel-17 carried out standardization with the goal of supporting the SRS antenna change transmission technique for terminals equipped with more than four receiving antennas.
  • Figure 2 is a diagram illustrating flexible aperiodic SRS transmission timing control.
  • Rel-17 MIMO the following two techniques were standardized to more flexibly control aperiodic SRS transmission according to the DL and UL slot ratios and traffic conditions of various TDD systems.
  • a technique was introduced to dynamically control the slot offset value for aperiodic SRS transmission trigger through DCI. This is to solve a problem in which SRS transmission may be significantly delayed depending on the DL and UL slot settings due to the existing slot offset value being semi-statically fixed.
  • a new DCI field was defined that specifies one of a plurality of slot offset values set in the RRC message.
  • the slot offset value indicated through the DCI field is standardized to be calculated based on available slots, which are defined as uplink slots and slots composed of flexible symbols, thereby reducing the number of slots. Flexible SRS transmission triggering is possible with offset candidate values.
  • a technique was introduced to trigger aperiodic SRS transmission without accompanying UL data transmission and CSI reporting.
  • SRS transmission could be triggered together through UL DCI only when PUSCH is allocated to trigger UL data and/or CSI reporting. It was difficult for the base station to estimate the UL/DL channel by triggering SRS for a terminal in a situation where there was no UL data to transmit and aperiodic CSI reporting was not required. This technique is intended to solve the above-mentioned problems.
  • the SRS antenna change transmission technique supported by the Rel-15/16 NR system only considered terminals equipped with four receiving antennas.
  • Rel-17 MIMO standardized the SRS antenna change transmission method for terminals equipped with 6 and 8 receiving antennas.
  • the extended antenna change transmission method supports the following combinations of the number of Nt transmit antennas and the number of Nr receive antennas.
  • the above SRS transmission can be transmitted within one slot, or over two to four slots.
  • Figure 3 is a diagram illustrating partial band SRS transmission.
  • SRS single-reliable and low-latency communications
  • Rel-15 and Rel-16 SRS could be transmitted repeatedly for up to four symbols within one slot, except for location determination.
  • SRS can be repeatedly transmitted in up to 14 symbols within a slot to secure wider SRS coverage.
  • SRS can be transmitted in 8, 10, 12, or 14 consecutive symbols within a slot.
  • the other is to allow SRS to be transmitted only in partial bands.
  • the base station can set the resource block location and SRS transmission band where SRS transmission starts to the terminal.
  • the corresponding frequency position may also be hopping or fixed according to a set rule. Due to the introduction of this technique, different terminals can simultaneously transmit SRS in different partial bands to the same base station, increasing the capacity of SRS.
  • MIMO Multiple Input Multiple Output
  • PUSCH Physical Uplink Shared Channel
  • SRS can be used for UL link adaptation (codebook/non-codebook), beam management, and DL CSI acquisition (antenna switching). If there is a collision/partial collision between the SRS and another UL channel/RS (from time domain to symbol-level), the following operations can be performed.
  • Standardization has been carried out so that the following operations are performed on SRS resources. i) If the priority of the SRS is high, the SRS is transmitted as is. ii) If the priority of the other UL channel/RS is high, instead of dropping all of the SRS resources, only the SRS symbols in the overlapping area are dropped, and the other UL channel/RS is transmitted.
  • multi ports e.g. 8 ports
  • SRS for AS (antenna switching)/CB (codebook-based) use to improve channel estimation performance in SRS enhancement to support up to 8 layer PUSCH transmission in relation to SRS
  • TDM for multi symbols (e.g. 2 symbols) was agreed upon (see Table 2 below).
  • '/' means 'and', 'or', or 'and/or' depending on the context.
  • TDM operation in which multi ports of CB-use SRS are mapped to multi symbols can be supported.
  • 8 ports can be time-division mapped to 2 symbols. Among the two symbols, four of the eight ports may be mapped to the first symbol, and the remaining four ports may be mapped to the second symbol.
  • a collision may occur between other UL channel/RS and SRS for CB use in some symbol(s).
  • the existing method e.g. legacy SRS setting
  • the following operations are performed. If the priority of the other UL channel/RS is high, the symbol(s) in which collision occurred among the symbols for the corresponding SRS is dropped.
  • 'specific SRS resource set' may be an SRS resource set whose usage is set to codebook or antenna switching.
  • 'TDMed SRS resource' may mean an SRS resource in which a plurality of symbols (eg, 2 symbols) to which a plurality of ports (eg, 8 ports) are time division mapped are set.
  • 'paired symbols' may mean symbols in which a plurality of ports (e.g., 8 ports) are time division mapped.
  • 8 antenna ports which are partitioned into 2 subsets may be set in the SRS resource (e.g., in Table 1, the nrofSRS-Ports-n8 parameter is set to ports8tdm ).
  • Each subset can have 4 different ports. Subsets are mapped to different symbols.
  • nrofSymbols n4, symbol indexes 0 ⁇ 3
  • 2 subsets are created for each 2 symbols (e.g. symbol indexes 0 & 1, symbol indexes 2 & 3).
  • 'Paired symbols' may mean symbols to which the two subsets are mapped (e.g., two symbols based on symbol indexes 0 & 1, symbol indexes 2 & 3).
  • 'port' may mean an antenna port or SRS port.
  • the port index may be indicated as 0 to 7 or 1000 to 1007. That is, port #0 to #7 may mean port index #1000 to #1007, and vice versa.
  • the base station can perform scheduling/resource allocation to prevent collisions (for some symbols corresponding to some antenna ports) with other UL channels/RSs for TDMed SRS resources within a specific SRS resource set.
  • the UE does not expect collisions with other channels (some symbols to which some antenna ports are mapped) for TDM multi-port SRS resources.
  • the terminal may be set/instructed/defined to drop all corresponding paired symbols.
  • the terminal may be set/instructed/defined to drop all corresponding paired symbols. The following will explain with a specific example.
  • Four ports e.g. port #0, 2, 4, 6 or port # 0, 1, 4, 5) are mapped/set to symbol #0, 2, and the remaining 4 ports are mapped to symbol #1, 3. (e.g. port #1,3,5,7 or port #2, 3, 6, 7) can be mapped/configured.
  • a collision may occur in symbol #1 with another UL channel/RS that has a higher priority than the corresponding SRS.
  • the terminal also drops symbol #0, which did not collide among paired symbols #0 and #1. Specifically, the terminal drops paired symbols #0 and #1 that have collided, and transmits symbols #2 and #3. SRS is transmitted with the same number of symbols for each subset consisting of 4 ports. Sounding for all 8 ports can be performed under equal conditions (e.g. number of symbols).
  • channel estimation is performed based on some of the subsets that make up the 8 ports, there may be differences with information in the existing SRS and the channel estimation quality may deteriorate. Instead of dropping only the symbol(s) in which a collision occurred, all paired symbols can be dropped to prevent deterioration in channel estimation quality and improve resource utilization.
  • Partial symbol collisions may be allowed in paired symbols for SRS resources within a specific SRS resource set. That is, as before, the terminal can drop only the symbol in which a collision occurred among the paired symbols and transmit the SRS based on the remaining symbol(s).
  • the base station does not perform scheduling for PUSCH of up to 8 ports when scheduling PUSCH through UL grant DCI after transmitting the relevant SRS resource (until transmitting SRS for additional codebook purposes) or sets a rule that prevents the scheduling from being performed. Constraints can be defined.
  • the existing legacy PUSCH scheduling operation can be performed as follows.
  • the base station receives the SRS for codebook use from the terminal. Afterwards, the base station can use the SRI field in the UL grant DCI (i.e., DCI for scheduling of PUSCH) to indicate some SRS resources among the SRS resources for the received codebook.
  • the transmission beam i.e. spatial domain filter
  • port(s) to be used for PUSCH can be determined/instructed.
  • the terminal interprets the SRI indication based on SRS resources for codebook purposes recently transmitted before receiving the corresponding UL grant DCI. Specifically, the terminal utilizes the transmission beam and port(s) of the latest SRS resource for PUSCH transmission.
  • partial drop drop of a partial symbol among paired symbols
  • sounding of up to 8 ports may not be performed fairly or some ports may be dropped.
  • constraints that allow the base station to perform scheduling based on up to The X port(s) may be set/indicated/defined in advance.
  • X port may be defined/defined as the number of ports on which remaining transmissions were performed after some port transmissions were dropped due to partial drop. For example, it can be assumed that SRS transmission for codebook purposes was transmitted by distributing 4 ports to symbols #0 and #1, of which symbol #1 was dropped. The base station can perform PUSCH scheduling based on up to 4 ports after transmitting the corresponding SRS (until before transmitting SRS for additional codebook purposes).
  • the number of ports in subsequent PUSCH scheduling is limited until additional SRS transmission is performed. Unbalanced sounding is performed for each subset to minimize negative effects on subsequent PUSCH scheduling.
  • this embodiment has an advantage in terms of implementation complexity compared to defining additional operations for collision handling.
  • Proposals 1 to 3 may be implemented using specific combinations.
  • Proposals 1 to 3 above are also applicable to 8 port SRS for antenna switching/non-codebook purposes.
  • An example of a terminal (or base station) operation based on at least one of the above-described embodiments is as follows.
  • the terminal receives (transmits) settings related to SRS (e.g. SRS-config in Table 1).
  • the setting information may include information/settings based on at least one of Proposals 1 to 3.
  • the terminal receives (transmits) a message that sets/instructs/triggers transmission of the SRS.
  • the message may be based on RRC, MAC CE or DCI.
  • the terminal transmits (receives) SRS based on the message. At this time, settings based on at least one of Proposals 1 to 3 may be applied.
  • the SRS can be set/scheduled/instructed/triggered so that some of the paired symbols do not collide with other UL channels/signals (Proposal 1).
  • the terminal may drop the paired symbols (Proposal 2).
  • the terminal can drop only the symbols in which the collision occurred (Proposal 3).
  • the terminal receives (transmits) a message (e.g. DCI) that sets/instructs PUSCH transmission.
  • the message may be based on the embodiment of Proposal 3.
  • the UE can expect the PUSCH to be scheduled based on ports mapped to symbols that were not dropped.
  • the base station can schedule PUSCH based on ports mapped to symbols that were not dropped.
  • the terminal (base station) transmits (receives) PUSCH based on the above message.
  • the above terminal/base station operation is only an example, and each operation (or step) is not necessarily essential. Depending on the terminal/base station implementation method, operations related to SRS transmission of the terminal according to the above-described embodiments may be omitted or added. .
  • the operations of the base station/terminal according to the above-described embodiments are similar to the device of FIG. 6 (e.g., the processor of FIG. 6 (e.g., the processor of FIG. 6) to be described later. It can be processed by 110, 210)).
  • the operations of the base station/terminal include at least one processor (e.g., the processors 110 and 210 in FIG. 6). It may be stored in memory (e.g., 140 and 240 in FIG. 6) in the form of instructions/programs (e.g., instructions, executable code) for operation.
  • processors e.g., the processors 110 and 210 in FIG. 6
  • memory e.g., 140 and 240 in FIG. 6
  • instructions/programs e.g., instructions, executable code
  • Figure 4 is a flowchart to explain a method performed by a terminal according to an embodiment of the present specification.
  • the method performed by the terminal in the wireless communication system includes a step of receiving configuration information related to SRS (S410) and a step of transmitting SRS based on SRS resources (S420). Includes.
  • the terminal receives configuration information related to a sounding reference signal (SRS) from the base station.
  • the configuration information includes information about SRS resource(s).
  • the configuration information may be based on SRS-Config in Table 1.
  • the usage of the SRS resource set to which the SRS resource belongs can be set to codebook, non-codebook, beam management, or antenna switching.
  • the setting information may include information related to operations/settings based on at least one of proposals 1 to 3 described above.
  • Multiple symbols may be set in the SRS resource. Eight ports may be time division mapped to the plurality of symbols.
  • the eight ports can be divided into two subsets. Each subset with four (different) ports can be mapped to a different symbol. As an example, two subsets may be mapped to two symbols.
  • the number of symbols (eg, nrofSymbols) set in the SRS resource may be 2, 4, 8, 10, 12, or 14.
  • the plurality of symbols may mean all or part of the symbols based on the number of symbols set in the SRS resource.
  • the plurality of symbols may be based on two symbols to which the two subsets are mapped. That is, the number of symbols set in the SRS resource is 2 and the plurality of symbols may be total symbols (2 symbols) based on the number of symbols.
  • the plurality of symbols may be one of one or more symbol groups based on the number of symbols.
  • Each of the one or more groups of symbols may include two symbols to which two subsets are mapped based on the partition of the eight ports.
  • the one or more symbol groups are group 1 (symbols #0, #1), group 2 (symbols #2, #) based on the number of symbols 4 (symbols #0 to #3). 3) may be included.
  • the first subset containing four ports is symbols #0.
  • the second subset containing the remaining four ports e.g. port #1, 3, 5, 7 or port #2, 3, 6, 7) may be mapped to symbols #1 and #3.
  • the two subsets can be mapped based on the symbol index.
  • the ports of the first subset of the eight ports are mapped to symbols based on an even symbol index (e.g., symbol index 0, 2..) among the two symbols. It can be.
  • Ports of the second subset of the eight ports may be mapped to symbols based on odd symbol indices (e.g., symbol index 1, 3, etc.) among the two symbols.
  • the ports of the first subset may be based on four port indices (eg, 1000, 1002, 1004, 1006 or 1000, 1001, 1004, 1005) among port indices 1000 to 1007.
  • the ports of the second subset may be based on the remaining four port indices (eg, 1001, 1003, 1005, 1007 or 1002, 1003, 1006, 1007) among the port indices 1000 to 1007.
  • the terminal transmits the SRS to the base station based on the SRS resource.
  • the SRS may be transmitted in symbols based on the SRS resource.
  • the SRS may be transmitted based on the eight ports.
  • the SRS may be transmitted based on the port(s) mapped to the corresponding symbol.
  • the SRS may be periodic SRS (periodic SRS), aperiodic SRS (aperiodic SRS), or semi-persistent SRS (semi-persistent SRS).
  • the plurality of symbols or the at least one symbol may be dropped based on the fact that at least one of the plurality of symbols overlaps a symbol related to another uplink signal.
  • being dropped may mean that the corresponding SRS is not transmitted in the dropped symbol(s).
  • This embodiment may be based on Proposal 2 and/or Proposal 3.
  • the plurality of symbols may be dropped.
  • the at least one symbol may be dropped.
  • the other uplink signal may include at least one of a physical uplink control channel (PUCCH) or a sounding reference signal (SRS).
  • PUCCH physical uplink control channel
  • SRS sounding reference signal
  • the method may further include a DCI receiving step and a PUSCH transmitting step.
  • the terminal receives downlink control information (DCI) for scheduling of a physical uplink shared channel (PUSCH) from the base station.
  • DCI downlink control information
  • the terminal transmits the PUSCH to the base station based on the DCI.
  • One or more ports associated with the PUSCH may be the same as one or more ports indicated based on the DCI.
  • the DCI may include an SRS Resource Indicator (SRI) field. Based on the SRI field, one or more SRS resources among the SRS resources of the SRS resource set may be determined. The one or more ports associated with the PUSCH may be based on the port(s) associated with the one or more SRS resources (e.g., the eight ports).
  • SRI SRS Resource Indicator
  • the at least one symbol may be dropped.
  • the number of ports related to PUSCH scheduling may be limited. Specifically, based on the at least one symbol being dropped, the indicated one or more ports may be based on ports excluding ports mapped to the at least one symbol among the eight ports. This embodiment may be based on Proposal 3. For example, referring to the above-mentioned example, it may be assumed that symbol #1 among symbols #0 and #1 is dropped.
  • the one or more ports indicated above are ports (e.g. port #0) excluding the four ports mapped to symbol #1 (e.g. port #1,3,5,7 or port #2,3,6,7). ,2,4,6 or port #0,1,4,5).
  • Operations based on the above-described steps S410 to S420, the DCI reception step, and the PUSCH transmission step can be implemented by the device in FIG. 6.
  • the terminal 200 may control one or more transceivers 230 and/or one or more memories 240 to perform operations based on S410 to S420, the DCI reception step and the PUSCH transmission step.
  • S510 to S520, the DCI transmission step and the PUSCH reception step, described later, correspond to S410 to S420, the DCI reception step and the PUSCH transmission step described in FIG. 4.
  • redundant description will be omitted. That is, the detailed description of the base station operation described later can be replaced with the description/embodiment of FIG. 4 corresponding to the corresponding operation.
  • the description/embodiment of S410 to S420 of FIG. 4 may be additionally applied to the base station operation of S510 to S520, which will be described later.
  • the description/embodiment of the DCI reception step and PUSCH transmission step described above may be additionally applied to the base station operation according to the DCI transmission step and PUSCH reception step described later.
  • Figure 5 is a flowchart to explain a method performed by a base station according to another embodiment of the present specification.
  • the base station transmits configuration information related to a sounding reference signal (SRS) to the terminal.
  • SRS sounding reference signal
  • the base station receives the SRS from the terminal based on the SRS resource.
  • the method may further include a DCI transmission step and a PUSCH reception step.
  • the base station transmits downlink control information (DCI) for scheduling of a physical uplink shared channel (PUSCH) to the terminal.
  • DCI downlink control information
  • the base station receives the PUSCH from the terminal based on the DCI.
  • the operations based on the above-described steps S510 to S520, the DCI transmission step and the PUSCH reception step can be implemented by the device of FIG. 6.
  • the base station 100 may control one or more transceivers 130 and/or one or more memories 140 to perform operations based on S510 to S520, the DCI transmission step and the PUSCH reception step.
  • Figure 6 is a diagram showing the configuration of a first device and a second device according to an embodiment of the present specification.
  • the first device 100 may include a processor 110, an antenna unit 120, a transceiver 130, and a memory 140.
  • the processor 110 performs baseband-related signal processing and may include an upper layer processing unit 111 and a physical layer processing unit 115.
  • the upper layer processing unit 111 can process operations of the MAC layer, RRC layer, or higher layers.
  • the physical layer processing unit 115 can process PHY layer operations. For example, when the first device 100 is a base station device in base station-to-device communication, the physical layer processing unit 115 may perform uplink reception signal processing, downlink transmission signal processing, etc. For example, when the first device 100 is the first terminal device in terminal-to-device communication, the physical layer processing unit 115 performs downlink reception signal processing, uplink transmission signal processing, sidelink transmission signal processing, etc. can do. In addition to performing baseband-related signal processing, the processor 110 may also control the overall operation of the first device 100.
  • the antenna unit 120 may include one or more physical antennas, and may support MIMO transmission and reception when it includes a plurality of antennas.
  • the transceiver 130 may include a radio frequency (RF) transmitter and an RF receiver.
  • the memory 140 may store information processed by the processor 110 and software, operating system, and applications related to the operation of the first device 100, and may also include components such as buffers.
  • the processor 110 of the first device 100 is set to implement the operation of the base station in communication between base stations and terminals (or the operation of the first terminal device in communication between terminals) in the embodiments described in this disclosure. It can be.
  • the second device 200 may include a processor 210, an antenna unit 220, a transceiver 230, and a memory 240.
  • the processor 210 performs baseband-related signal processing and may include an upper layer processing unit 211 and a physical layer processing unit 215.
  • the upper layer processing unit 211 can process operations of the MAC layer, RRC layer, or higher layers.
  • the physical layer processing unit 215 can process PHY layer operations. For example, when the second device 200 is a terminal device in communication between a base station and a terminal, the physical layer processing unit 215 may perform downlink reception signal processing, uplink transmission signal processing, etc. For example, when the second device 200 is a second terminal device in terminal-to-device communication, the physical layer processing unit 215 performs downlink received signal processing, uplink transmitted signal processing, sidelink received signal processing, etc. can do.
  • the processor 210 may also control the overall operation of the second device 210.
  • the antenna unit 220 may include one or more physical antennas, and may support MIMO transmission and reception when it includes a plurality of antennas.
  • Transceiver 230 may include an RF transmitter and an RF receiver.
  • the memory 240 may store information processed by the processor 210 and software, operating system, and applications related to the operation of the second device 200, and may also include components such as buffers.
  • the processor 210 of the second device 200 is set to implement the operation of the terminal in communication between base stations and terminals (or the operation of the second terminal device in communication between terminals) in the embodiments described in this disclosure. It can be.
  • the base station and the terminal in base station-to-device communication (or the first terminal and the second terminal in terminal-to-device communication)
  • the items described can be applied equally, and overlapping explanations will be omitted.
  • the wireless communication technology implemented in the devices 100 and 200 of the present disclosure may include Narrowband Internet of Things (NB-IoT) for low-power communication as well as LTE, NR, and 6G.
  • NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology, and may be implemented in standards such as LTE Cat NB1 and/or LTE Cat NB2, and is not limited to the above-mentioned names.
  • LPWAN Low Power Wide Area Network
  • LTE-M technology may be an example of LPWAN technology, and may be called various names such as enhanced Machine Type Communication (eMTC).
  • eMTC enhanced Machine Type Communication
  • LTE-M technologies include 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. It can be implemented in at least one of various standards such as Type Communication, and/or 7) LTE M, and is not limited to the above-mentioned names.
  • the wireless communication technology implemented in the devices 100 and 200 of the present disclosure may include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) considering low-power communication. It may include one, and is not limited to the above-mentioned names.
  • ZigBee technology can create personal area networks (PANs) related to small/low-power digital communications based on various standards such as IEEE 802.15.4 and can be called by various names.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un procédé selon un mode de réalisation de la présente invention comprend les étapes consistant à : recevoir des informations de configuration relatives à un signal de référence de sondage (SRS) ; et transmettre le SRS sur la base d'une ressource SRS. Les informations de configuration comprennent des informations concernant la ressource SRS. Une pluralité de symboles sont configurés dans la ressource SRS. Huit ports sont mappés par répartition dans le temps à la pluralité de symboles. La pluralité de symboles est caractérisée en ce qu'elle est abandonnée sur la base du fait qu'au moins l'un de la pluralité de symboles chevauche un symbole associé à un autre signal de liaison montante.
PCT/KR2024/001287 2023-01-26 2024-01-26 Procédé de transmission et de réception de signal de référence de sondage dans un système de communication sans fil, et appareil associé WO2024158253A1 (fr)

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Citations (2)

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Publication number Priority date Publication date Assignee Title
US20200221311A1 (en) * 2019-01-09 2020-07-09 Qualcomm Incorporated Collision of sounding reference signal (srs) and physical uplink shared channel (pusch) in case of carrier aggregation
US20220200768A1 (en) * 2019-04-25 2022-06-23 Lg Electronics Inc. Method and apparatus for transmitting or receiving sounding reference signal in wireless communication system

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US20200221311A1 (en) * 2019-01-09 2020-07-09 Qualcomm Incorporated Collision of sounding reference signal (srs) and physical uplink shared channel (pusch) in case of carrier aggregation
US20220200768A1 (en) * 2019-04-25 2022-06-23 Lg Electronics Inc. Method and apparatus for transmitting or receiving sounding reference signal in wireless communication system

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