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EP-4038801-B1 - SOUNDING REFERENCE SIGNAL (SRS) CONFIGURATIONS FOR ONE OR MORE FREQUENCY HOPS

EP4038801B1EP 4038801 B1EP4038801 B1EP 4038801B1EP-4038801-B1

Inventors

  • MANOLAKOS, Alexandros
  • AKKARAKARAN, SONY

Dates

Publication Date
20260513
Application Date
20200908

Claims (15)

  1. A method of wireless communication performed by a user equipment, UE, comprising: receiving (1910), from a network entity, a sounding reference signal, SRS, configuration that indicates, for at least one frequency hop, an allocation of less than all subcarriers of a sounding bandwidth to SRS per orthogonal frequency division multiplexing, OFDM, symbol in a respective frequency hop; transmitting (1920), in a first frequency hop in accordance with the SRS configuration, a first plurality of OFDM symbols with at least one SRS across all subcarriers of a first sounding bandwidth associated with the first frequency hop; and transmitting (1930), in a second frequency hop, a second plurality of OFDM symbols with at least one SRS across all subcarriers of a second sounding bandwidth associated with the second frequency hop.
  2. The method of claim 1, wherein the first plurality of OFDM symbols correspond to a consecutive collection of OFDM symbols of a slot.
  3. The method of claim 1, wherein the first plurality of OFDM symbols correspond to a first consecutive collection of OFDM symbols of a slot, and wherein the second plurality of OFDM symbols correspond to a second consecutive collection of OFDM symbols of the slot.
  4. The method of claim 1, wherein the SRS configuration indicates, for a first set of frequency hops in a slot, a comb-N SRS resource which spans M symbols with a repetition factor of R and B frequency hops within the slot, satisfies the equation of N*R*B = M, whereinMis greater than 1.
  5. The method of claim 4, wherein for a comb-2 with 4 symbols, R is one of 1 or 2 and B is one of 1 or 2, or wherein for a comb- 2 with 8 symbols, R is one of 1, 2 or 4 and B is one of 1, 2 or 4, wherein for a comb- 2 with 12 symbols, R is one of 1, 2, 4 or 6 and B is one of 1, 2, 4 or 6, wherein for a comb- 4 with 8 symbols, R is one of 1 or 2 and B is one of 1 or 2, or wherein for a comb- 4 and 12 symbols, R is one of 1 or 3 and B is one of 1 or 3.
  6. The method of claim 4, wherein M is greater than R , or wherein M is greater than B, or a combination thereof.
  7. The method of claim 4, wherein the SRS configuration further indicates, for a second set of frequency hops in a slot, one or more modified values for one or more of N, R, B and/or M .
  8. The method of claim 7, wherein the SRS configuration sets comb- N to a new value of comb- N 2, for a last frequency hop in the slot, where value of N2 is less than N.
  9. The method of claim 8, wherein M is equal to 12, R is equal to 1, B is equal to 2, N is equal to 8 for the first set of frequency hops in the slot and N2 is equal to 4 for the last frequency hop in the slot.
  10. The method of claim 4, wherein the SRS configuration further configures two comb-types and two resource element offsets to be used in the first frequency hop and a second frequency hop, respectively.
  11. The method of claim 1, wherein the network entity is one of a serving TRP, a location server, or a location management function.
  12. A method of wireless communication performed by a base station, BS, comprising: transmitting (2010), to a user equipment, UE, a sounding reference signal, SRS, configuration that indicates, for at least one frequency hop, an allocation of less than all subcarriers of a sounding bandwidth to SRS per orthogonal frequency division multiplexing, OFDM, symbol in a respective frequency hop; receiving (2020), from the UE in a first frequency hop, a first plurality of OFDM symbols with at least one SRS across all subcarriers of a first sounding bandwidth associated with the first frequency hop; and receiving (2030), from the UE in a second frequency hop, a second plurality of OFDM symbols with at least one SRS across all subcarriers of a second sounding BW associated with the second frequency hop.
  13. A user equipment, UE, (302) comprising: a memory (338); at least one transceiver (308); and at least one processor (332) communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to: receive, from a network entity, a sounding reference signal, SRS, configuration that indicates, for at least one frequency hop, an allocation of less than all subcarriers of a sounding bandwidth to SRS per orthogonal frequency division multiplexing, OFDM, symbol in a respective frequency hop; transmit, in a first frequency hop in accordance with the SRS configuration, a first plurality of OFDM symbols with at least one SRS across all subcarriers of a first sounding bandwidth associated with the first frequency hop; transmit, in a second frequency hop, a second plurality of OFDM symbols with at least one SRS across all subcarriers of a second sounding bandwidth associated with the second frequency hop.
  14. A base station, BS, (304) comprising: a memory (340); at least one transceiver (314); and at least one processor (334) communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to: transmit, to a user equipment, UE, a sounding reference signal, SRS, configuration that indicates, for at least one frequency hop, an allocation of less than all subcarriers of a sounding bandwidth to SRS per orthogonal frequency division multiplexing, OFDM, symbol in a respective frequency hop; receive, from the UE in a first frequency hop, a first plurality of OFDM symbols with at least one SRS across all subcarriers of a first sounding bandwidth associated with the first frequency hop; and receive, from the UE in a second frequency hop, a second plurality of OFDM symbols with at least one SRS across all subcarriers of a second sounding BW associated with the second frequency hop.
  15. A non-transitory computer-readable medium containing instructions stored thereon, for causing at least one processor to perform the method of any one of claims 1 to 12.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present Application for Patent claims the benefit of Provisional Patent Application No. 62/910,383 entitled "CONFIGURATION OF REPETITION FACTOR AND HOPPING FOR SOUNDING REFERENCE SIGNALS (SRS) FOR POSITIONING" filed October 03, 2019, and Non-Provisional Patent Application No. 16/910,607 entitled "SOUNDING REFERENCE SIGNAL (SRS) CONFIGURATIONS FOR ONE OR MORE FREQUENCY HOPS" filed June 24, 2020, both of which are assigned to the assignee hereof. BACKGROUND OF THE DISCLOSURE 1. Field of the Disclosure Aspects of the disclosure relate generally to wireless communications and more particularly to sounding reference signal (SRS) configuration and SRS use. 2. Description of the Related Art Wireless communication systems have developed through various generations, including a first-generation analog wireless phone service (1G), a second-generation (2G) digital wireless phone service (including interim 2.5G networks), a third-generation (3G) high speed data, Internet-capable wireless service and a fourth-generation (4G) service (e.g., LTE or WiMax). There are presently many different types of wireless communication systems in use, including cellular and personal communications service (PCS) systems. Examples of known cellular systems include the cellular Analog Advanced Mobile Phone System (AMPS), and digital cellular systems based on code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), the Global System for Mobile access (GSM) variation of TDMA, etc. A fifth generation (5G) wireless standard, referred to as New Radio (NR), enables higher data transfer speeds, greater numbers of connections, and better coverage, among other improvements. The 5G standard, according to the Next Generation Mobile Networks Alliance, is designed to provide data rates of several tens of megabits per second to each of tens of thousands of users, with 1 gigabit per second to tens of workers on an office floor. Several hundreds of thousands of simultaneous connections should be supported in order to support large wireless deployments. Consequently, the spectral efficiency of 5G mobile communications should be significantly enhanced compared to the current 4G standard. Furthermore, signaling efficiencies should be enhanced and latency should be substantially reduced compared to current standards. Patent document WO 2018/199696 A1 provides a method for transmitting SRS, as well as a mobile terminal for the same. Reference is also made to document HUAWEI ET AL: "SRS design for NR positioning", 3GPP DRAFT; R1-1908115, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE vol. RAN WG1, no. Prague, Czech Republic; 20190826 - 20190830 17 August 2019 (2019-08-17), XP051764735. SUMMARY The scope of protection is defined by the appended claims. Other objects and advantages associated with the aspects disclosed herein will be apparent to those skilled in the art based on the accompanying drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are presented to aid in the description of various aspects of the disclosure and are provided solely for illustration of the aspects and not limitation thereof. FIG. 1 illustrates an exemplary wireless communications system, according to various aspects.FIGS. 2A and 2B illustrate example wireless network structures, according to various aspects.FIG. 3 is a block diagram illustrating an exemplary UE, BS and network entity, according to various aspects.FIG. 4 is a diagram illustrating an example of a frame structure for use in a wireless telecommunications system according to an aspect of the disclosure.FIG. 5 is a diagram illustrating an exemplary technique for determining a position of a UE using information obtained from a plurality of base stations.FIG. 6 is a diagram showing exemplary timings of round-trip-time (RTT) measurement signals exchanged between a base station and a UE, according to aspects of the disclosure.FIG. 7 illustrates some examples of different SRS configuration options.FIG. 8 illustrates some examples of different SRS stagger configurations for positioning.FIG. 9 illustrates an example of an SRS stagger configuration for positioning, according to aspects of the disclosure.FIG. 10 illustrates an example of an SRS stagger configuration for positioning, according to aspects of the disclosure.FIG. 11 illustrates an example of an SRS stagger configuration for positioning,.FIG. 12 illustrates an example of an SRS stagger configuration for positioning, according to aspects of the disclosure.FIG. 13 illustrates an example of an SRS stagger configuration for positioning, according to aspects of the disclosureFIG. 14 illustrates an example of a table for various SRS stagger configurations for positioning, according to aspects of the disclosureFIG. 15 illustrates an example o