Invention Grant
- Patent Title: System and method for high speed doppler compensation in a cellular environment
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Application No.: US17441962Application Date: 2020-08-05
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Publication No.: US11929950B2Publication Date: 2024-03-12
- Inventor: Haitong Sun , Wei Zeng , Yushu Zhang , Hong He , Oghenekome Oteri , Sigen Ye , Weidong Yang , Chunxuan Ye , Chunhai Yao , Dawei Zhang
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: APPLE INC.
- Current Assignee: APPLE INC.
- Current Assignee Address: US CA Cupertino
- Agency: Sterne, Kessler, Goldstein & Fox P.L.L.C.
- International Application: PCT/CN2020/107204 2020.08.05
- International Announcement: WO2022/027361A 2022.02.10
- Date entered country: 2021-09-22
- Main IPC: H04L5/00
- IPC: H04L5/00 ; H04B7/01

Abstract:
Methods and apparatuses are disclosed for calculating and compensating for Doppler shift in a high-speed environment. When in a high-speed environment, Doppler shifts on a transmitted radio frequency signal can become extremely large, which may make it difficult or even impossible for a receiving device to accurately decipher the signal. Therefore, embodiments of the present disclosure describe how tracking reference signals can be transmitted from multiple transmission/reception points, and processed by the UE. For example, the TRS transmitted from the TRP can be enhanced to allow for TRS information from two different TRPs. Additionally, or alternatively, a flag can be set within TRS information that identifies it as having originated from either a first TRP or a second TRP. Additionally, the UE can calculate Doppler shift information and report that information back to the base station in a report message, such as an SRS message. In this manner, the base station can precompensate for the Doppler shift.
Public/Granted literature
- US20230155760A1 SYSTEM AND METHOD FOR HIGH SPEED DOPPLER COMPENSATION IN A CELLULAR ENVIRONMENT Public/Granted day:2023-05-18
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