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EP-4302534-B1 - DISTRIBUTED UNIT-CENTRAL UNIT-SERVER SIGNALING OF PER-SECTOR FEATURES FOR POSITIONING

EP4302534B1EP 4302534 B1EP4302534 B1EP 4302534B1EP-4302534-B1

Inventors

  • GOPALAKRISHNAN, Sooryanarayanan
  • JI, TINGFANG
  • SUNDARARAJAN, JAY KUMAR
  • MANOLAKOS, Alexandros
  • AKKARAKARAN, SONY
  • FISCHER, SVEN
  • BHUSHAN, NAGA
  • YOO, TAESANG
  • MUKKAVILLI, KRISHNA KIRAN
  • DUAN, Weimin

Dates

Publication Date
20260513
Application Date
20220201

Claims (16)

  1. A method of wireless communication performed by a central unit (602), CU, comprising: jointly processing channel information associated with a user equipment (104), UE, in order to generate a jointly processed report comprising a cross-sector time-angle channel profile, the channel information collected from a plurality of collocated transmit and receive points (604), TRPs, of a base station (102), wherein the channel information comprises per-sector time-angle channel profiles, comprising two-dimensional truncated power delay profiles (800), TPDPs, wherein each TPDP (800) comprises a quantized local angle and a quantized delay, and the TPDPs (800) are truncated to the top N channel taps; and transmitting the jointly processed report to a location server (112).
  2. The method of claim 1, in which quantization of the local angle is uniform and quantization of the delay is uniform, the jointly processed report based on quantization information including a quantity of quantization bins and a size of the quantization bins.
  3. The method of claim 1, in which the jointly processed report comprises a concatenation of TPDPs in an angle dimension.
  4. The method of claim 1, in which the jointly processed report comprises a selected TPDP in response to overlapping regions of the TRPs.
  5. The method of claim 1, in which the jointly processed report comprises angles in a global coordinate system or angles with respect to a reference TRP of the plurality of collocated TRPs.
  6. The method of claim 1, in which the jointly processed report comprises a three-dimensional channel profile comprising a time, an angle and a sector.
  7. The method of claim 1, further comprising receiving a TRP report via an F1 control plane and/or an F1 user plane.
  8. The method of claim 1, further comprising transmitting a request to each of the plurality of collocated TRPs requesting each TRP to report channel information for at least one of a specific UE, a specific time period, or a specific reference signal resource.
  9. The method of claim 8, in which the request includes a response time for when each TRP reports the channel information.
  10. The method of claim 1, further comprising receiving the channel information from the plurality of collocated TRPs without transmitting a request for the channel information.
  11. The method of claim 1, in which the channel information is based on an angle of departure associated with a downlink reference signal.
  12. The method of claim 1, in which the channel information is based on an angle of arrival associated with an uplink reference signal.
  13. The method of claim 1, further comprising receiving a request for the jointly processed report from the location server.
  14. An apparatus (304) for wireless communication configured in a central unit (602), CU, comprising: a transceiver (350); a memory (386); and at least one processor (384) communicatively coupled to the memory (386) and the transceiver (350), the at least one processor (384) configured to: jointly process channel information associated with a user equipment (104), UE, in order to generate a jointly processed report comprising a cross-sector time-angle channel profile, the channel information collected from a plurality of collocated transmit and receive points (604), TRPs, wherein the channel information comprises per-sector time-angle channel profiles, comprising two-dimensional truncated power delay profiles, TPDPs, (800), wherein each TPDP (800) comprises a quantized local angle and a quantized delay, and the TPDPs (800) are truncated to the top N channel taps; and transmit, via the transceiver (350), the jointly processed report to a location server (112).
  15. A method of wireless communication performed by a distributed unit (604), DU, , comprising: receiving channel information associated with a plurality of user equipments (104), UEs; generating a two-dimensional truncated power delay profile (800), TPDP, based on the channel information, wherein the TPDP comprises a quantized local angle and a quantized delay and is truncated to the top N channel taps; and reporting the two-dimensional TPDP (800) to a central unit (304).
  16. A system comprising the apparatus for wireless communication configured in a central unit (602) according to claim 14, and a plurality of collocated distributed units (604), DUs.

Description

CROSS-REFERENCE TO RELATED APPLICATION The present application claims the benefit of Greek Patent Application No. 20210100131, filed on March 4, 2021, and titled "DISTRIBUTED UNIT-CENTRAL UNIT -SERVER SIGNALING OF PER-SECTOR FEATURES FOR POSITIONING,". FIELD OF THE DISCLOSURE The present disclosure relates generally to wireless communications, and more specifically to wireless positioning. BACKGROUND Wireless communications systems are widely deployed to provide various telecommunications services such as telephony, video, data, messaging, and broadcasts. Typical wireless communications systems may employ multiple-access technologies capable of supporting communications with multiple users by sharing available system resources (e.g., bandwidth, transmit power, and/or the like). Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE/LTE-Advanced is a set of enhancements to the universal mobile telecommunications system (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP). A wireless communications network may include a number of base stations (BSs) that can support communications for a number of user equipments (UEs). A user equipment (UE) may communicate with a base station via the downlink and uplink. The downlink (or forward link) refers to the communications link from the base station to the UE, and the uplink (or reverse link) refers to the communications link from the UE to the base station. As will be described in more detail, a base station may be referred to as a Node B, a gNB, an access point (AP), a radio head, a transmit and receive point (TRP), a new radio (NR) base station, a 5G Node B, and/or the like. The above multiple access technologies have been adopted in various telecommunications standards to provide a common protocol that enables different user equipment to communicate on a municipal, national, regional, and even global level. New radio (NR), which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. Ericsson: "Summary of offline discussion on common positioning and TRP issues v2", 3GPP Draft; R3-204206, vol. RAN WG3, discusses single TRP ID vs TRP ID list in the measurement messages. It is discussed that there shall be no specification of whether the gNB-CU aggregates measurements from different gNB-DUs. It is also mentioned that the basic principal in positioning seems to be RAN does its best and LMF does with what it received. For aggregation, the CU should be well aware of the status of the DU in term of resource then it should not be an issue to aggregate. SUMMARY The invention is defined in the independent claims, to which attention is directed. Optional features are set out in the dependent claims. In the following the invention is best understood in view of figures 11 and 12 and the associated passages. The remaining embodiments, aspects and examples disclosed below are included for illustrative purpose and for facilitating the understanding of the invention. According to aspects of the present disclosure, a method of wireless communication by a central unit (CU), jointly processes channel information associated with a user equipment (UE) in order to generate a jointly processed report. The channel information is collected from collocated transmit and receive points (TRPs) of a base station. The base station transmits the jointly processed report to a location server. In further aspects, an apparatus for wireless communication in a central unit (CU), comprises a memory; a transceiver, and at least one processor communicatively coupled to the transceiver and the memory. The processor(s) is configured to jointly process channel information associated with a user equipment (UE) in order to generate a jointly processed report. The channel information is collected from collocated transmit and receive points (TRPs). The processor(s) is also configured to transmit, via the transceiver, the jointly processed report to a locati