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CN-116018762-B - Uplink sounding reference signal carrier aggregation

CN116018762BCN 116018762 BCN116018762 BCN 116018762BCN-116018762-B

Abstract

Methods and apparatus for Sounding Reference Signal (SRS) carrier aggregation are provided. The target device is configured with N (N≥2) SRSs, including a reference SRS and N-1 target SRSs. The N-1 target SRS are activated using low layer signaling, such as MAC-CE or DCI messages, such that each of the N SRS is transmitted from a common antenna port on a respective carrier component. The lower layer signaling for activating the target SRS may identify configuration parameters of the target SRS to be covered by corresponding configuration parameters of the reference SRS. Embodiments of the present application increase the effective SRS bandwidth, which may increase the accuracy of positioning measurements, while also reducing higher layer configuration signaling by activating a target SRS in lower layer signaling and overlaying some configuration parameters of the target SRS with corresponding configuration parameters of the reference SRS.

Inventors

  • KEVIN ZARIFI

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260508
Application Date
20210826
Priority Date
20210824

Claims (20)

  1. 1. A method for sounding reference signal, SRS, carrier aggregation in a wireless communication network, the method comprising: The method comprises the steps that User Equipment (UE) receives high-layer signaling comprising SRS configuration information of a plurality of SRSs; The UE receives lower layer signaling including information associating N-1 target SRSs of the plurality of SRSs with reference SRSs of the plurality of SRSs, wherein N is an integer and N 2; Based at least in part on the information associating the N-1 target SRSs with the reference SRS, overriding configuration parameters of the associated N-1 target SRSs with corresponding configuration parameters of the reference SRS, and The UE transmits the reference SRS and the associated N-1 target SRS, N SRSs including the reference SRS and the associated N-1 target SRS being transmitted on N different respective carrier component CCs on the same set of one or more antenna ports.
  2. 2. The method according to claim 1, wherein: the SRS configuration information received through higher layer signaling includes a list of target SRS candidates or their corresponding serving cell identification IDs, and The information received through lower layer signaling and associating the N-1 target SRS with the reference SRS includes information identifying the N-1 target SRS in the list of target SRS candidates as the N-1 target SRS to be transmitted on the same set of at least one antenna port as the reference SRS.
  3. 3. The method according to claim 1, wherein: the SRS configuration information received via higher layer signaling includes, for each of a plurality of reference SRS candidates including the reference SRS, a corresponding list of target SRS candidates, and The information received through lower layer signaling and associating the N-1 target SRSs with the reference SRS includes information identifying the N-1 target SRSs of the reference SRS in the corresponding list of target SRS candidates.
  4. 4. The method according to claim 1, wherein: the SRS configuration information received through higher layer signaling includes a list of M serving cell indexes, M N, and The information received through lower layer signaling and associating the N-1 target SRSs with the reference SRS includes information identifying N serving cell IDs in a list of M serving cell IDs; The reference SRS and the N-1 target SRS are N SRS having the same ID among the N serving cells corresponding to the N serving cell IDs identified in the information received through lower layer signaling.
  5. 5. The method according to claim 1, wherein: the SRS configuration information received through the higher layer signaling comprises a sequence of M IDs; the information received by lower layer signaling and associating the N-1 target SRSs with the reference SRS includes information indicating one of the IDs in the sequence of M IDs for each of the plurality of SRSs such that N of the plurality of SRSs have the same indication ID in the sequence of M IDs, and The reference SRS and the N-1 target SRS are N SRS having the same ID indicated by the information received through lower layer signaling.
  6. 6. The method of any one of claims 1 to 5, further comprising: the UE transmits SRS capability information indicating that the UE is capable of transmitting N SRS on N carrier components, each SRS being transmitted on a different carrier component on the same set of at least one antenna port.
  7. 7. A method for sounding reference signal carrier aggregation in a wireless communication network, the method comprising: The base station BS transmits a high-layer signaling including SRS configuration information of a plurality of sounding reference signals SRS to the user equipment UE; the BS transmits lower layer signaling to the UE including information associating N-1 target SRSs of the plurality of SRSs with a reference SRS of the plurality of SRSs, wherein N is an integer and N 2; The BS receiving, from the UE, N SRS on N different respective carrier component CCs, including the reference SRS and associated N-1 target SRS, the N SRS having been transmitted by the UE on a same set of one or more antenna ports; wherein the BS transmits the lower layer signaling including information associating N-1 target SRS of the plurality of SRS with a reference SRS of the plurality of SRS such that configuration parameters of the associated N-1 target SRS are covered with corresponding configuration parameters of the reference SRS.
  8. 8. The method of claim 7, wherein: the SRS configuration information transmitted by higher layer signaling includes a list of target SRS candidates or their corresponding serving cell identification IDs, and The information transmitted by lower layer signaling and associating the N-1 target SRS with the reference SRS includes information identifying the N-1 target SRS in a list of target SRS candidates as the N-1 target SRS to be transmitted on the same set of at least one antenna port as the reference SRS.
  9. 9. The method of claim 7, wherein: The SRS configuration information transmitted by higher layer signaling includes, for each of a plurality of reference SRS candidates including the reference SRS, a corresponding list of target SRS candidates, and The information sent by lower layer signaling and associating the N-1 target SRSs with the reference SRS includes information identifying the N-1 target SRSs of the reference SRS in the corresponding list of target SRS candidates.
  10. 10. The method of claim 7, wherein: The SRS configuration information transmitted through higher layer signaling includes a list of M serving cell indexes, M N, and The information sent by lower layer signaling and associating the N-1 target SRSs with the reference SRS includes information identifying N serving cell IDs in a list of M serving cell IDs, and The reference SRS and the N-1 target SRS are N SRS having the same ID among the N serving cells corresponding to the N serving cell IDs identified in the information transmitted through lower layer signaling.
  11. 11. The method of claim 7, wherein: The SRS configuration information sent through the high-layer signaling comprises sequences of M IDs; The information sent by lower layer signaling and associating the N-1 target SRSs with the reference SRS includes information indicating one of the IDs in the sequence of M IDs for each of the plurality of SRSs such that N of the plurality of SRSs have the same indication ID in the sequence of M IDs, and The reference SRS and the N-1 target SRS are N SRS having the same ID indicated by the information transmitted through lower layer signaling.
  12. 12. The method of any one of claims 7 to 11, the method further comprising: The BS receives SRS capability information for the UE, the SRS capability information indicating that the UE is capable of transmitting N SRS on N carrier components, each SRS being transmitted on a different carrier component on the same set of at least one antenna port.
  13. 13. An apparatus, comprising: At least one processor, and A computer readable storage medium operatively coupled to the at least one processor, the computer readable storage medium storing a program for execution by the at least one processor, the program comprising instructions for performing the method of any one of claims 1 to 6.
  14. 14. An apparatus, comprising: At least one processor, and A computer readable storage medium operatively coupled to the at least one processor, the computer readable storage medium storing a program for execution by the at least one processor, the program comprising instructions for performing the method of any one of claims 7 to 12.
  15. 15. A communication system comprising communication means for performing the method of any of claims 1 to 6, and communication means for performing the method of any of claims 7 to 12.
  16. 16. A computer-readable storage medium storing computer-executable instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 6.
  17. 17. A computer-readable storage medium storing computer-executable instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 7 to 12.
  18. 18. A computer program product comprising instructions for performing the method according to any one of claims 1 to 6.
  19. 19. A computer program product comprising instructions for performing the method according to any of claims 7 to 12.
  20. 20. A computing device comprising a processor for executing computer-executable instructions, such that the computing device implements the method of any one of claims 1 to 6 or implements the method of any one of claims 7 to 12.

Description

Uplink sounding reference signal carrier aggregation The present application claims priority from U.S. provisional patent application No. 63/070,358 entitled "uplink sounding reference signal carrier aggregation (UPLINK SOUNDING REFERENCE SIGNAL CARRIER AGGREGATION)" filed on 8/26 in 2020 and from U.S. patent application No. 17/410,470 entitled "uplink sounding reference signal carrier aggregation (UPLINK SOUNDING REFERENCE SIGNAL CARRIER AGGREGATION)" filed on 24 in 2021, the contents of which are incorporated herein by reference in their entirety. Technical Field The present application relates generally to wireless communications and, in particular embodiments, to systems and methods for generating and utilizing carrier aggregated Sounding REFERENCE SIGNAL (SRS) for uplink based measurements. Background In many wireless communication networks, the network makes uplink channel measurements based on Sounding REFERENCE SIGNAL (SRS) transmitted by the UE. For example, SRS may be used for various purposes including positioning, channel State Information (CSI) acquisition, beam management, and Uplink (UL) -based radio resource management (radio resource management, RRM) measurements. In wireless communication networks, positioning is the process of determining the geographic location of a mobile device (e.g., a smart phone, a notebook, a tablet or Personal Digital Assistant (PDA), etc.) or a navigation/tracking device. The device to be located may be referred to as a target device. Once the coordinates of the target device have been established, the coordinates may be mapped to a location (e.g., road, building address, etc.) and then reported to the requesting service or device. The transfer and mapping function of location information may be referred to as location services (LCS), and various other services may depend on the location services. A service using location data may be referred to as a location-based service (LBS). LBS may be used to provide location-aware applications (e.g., deliver localized weather forecasts, location-specific targeted advertising, navigation applications, emergency services, etc.) to users of devices, optimize network performance, and/or enhance automation services (e.g., network self-learning, self-optimization, etc.). More and more applications are under development that rely on accurate and timely positioning of wireless devices, and thus the need for more accurate and reliable positioning is also increasing. The uplink-based positioning solution is based on transmission of Uplink (UL) sounding REFERENCE SIGNAL, SRS from the target device, and on measurements of UL SRS received at a network node in the radio access network (radio access network, RAN). For example, measurements performed by the network node based on the received UL SRS may include UL reference time of Arrival (UL REFERENCE TIME of Arrival, UL RTOA), UL angle of Arrival (UL Angle of Arrival, UL AoA), and/or network node Reception-Transmission (Rx-Tx) time difference measurements. The accuracy of such UL-based measurements has a direct relationship with the bandwidth of the measured SRS, which in many wireless communication networks is limited to the active bandwidth portion (active bandwidth part, BWP) of the carrier component (carrier component, CC). For example, in the current New Radio (NR) standard, the maximum size of active BWP of a CC is limited to 400MHz. However, to achieve positioning accuracy on the order of 10 centimeters, a measurement SRS Bandwidth (BW) of at least 1GHz may be required. SRS carrier aggregation (carrier aggregation, CA), i.e. aggregating multiple CCs for SRS transmission, has been proposed as a candidate method to increase SRS bandwidth. However, the existing SRS CA configuration mechanism has the problems of large signaling overhead, large UE battery consumption, large time delay, unnecessary SRS transmission opportunity, and the like. Accordingly, it is desirable to provide methods and apparatus for improving SRS carrier aggregation configuration in a wireless communication network. Disclosure of Invention The present application provides methods and apparatus that may be used to implement a new uplink sounding reference signal carrier aggregation technique that utilizes low-layer signaling, such as medium access control (medium access control, MAC) control element (medium access control-control element, MAC-CE) messages or dynamic control information (dynamic control information, DCI) messages, to activate and/or update carrier aggregation SRS without requiring reconfiguration by higher-layer signaling. For example, a first broad aspect of the present application provides a method for SRS carrier aggregation in a wireless communication network, wherein a User Equipment (UE) receives high-level signaling including SRS configuration information of a plurality of SRSs and receives low-level signaling including information associating N-1 target SRSs of the plurality of SRSs with r