US-12627333-B2 - Doppler shift estimate reporting with pre-compensation

Abstract

A first cellular base station transmits a configuration message to a reporting device installed on a high-speed vehicle. The configuration message specifies one or more parameters of a Doppler measurement report. The reporting device performs one or more first Doppler measurements on the first base station and/or one or more second Doppler measurements on a second base station. The reporting device transmits the Doppler measurement report to the first and/or second base stations. The Doppler measurement report may be used by the first and/or second base stations to perform Doppler pre-compensation on transmissions to the reporting device.

Inventors

• Haitong Sun
• Dawei Zhang
• Wei Zeng
• Yushu Zhang
• Chunxuan Ye
• Jie Cui
• Huaning Niu

Assignees

• APPLE INC.

Dates

Publication Date

20260512

Application Date

20240312

Claims (20)

1. 1 . A baseband processor configured to cause a wireless device to: receive a configuration message from a first base station; perform one or more first measurements on the first base station and one or more second measurements on a second base station; and transmit a measurement report to the first base station or the second base station, wherein the measurement report comprises a differential between the first and second measurements, wherein the measurement report is provided according to aperiodic timing with low latency, and wherein the measurement report is provided with an acknowledgment message.
2. 2 . The baseband processor of claim 1 , wherein the one or more first and second measurements are performed responsive to receiving the configuration message.
3. 3 . The baseband processor of claim 1 , wherein the configuration message specifies one or more parameters of the measurement report, and wherein the measurement report is based on the one or more parameters.
4. 4 . The baseband processor of claim 3 , wherein the one or more parameters comprise an instruction to perform a plurality of first and second measurements, wherein performing the one or more first and second measurements comprises performing the plurality of first and second measurements, and wherein the measurement report is based on an average of differentials between the plurality of first and second measurements.
5. 5 . The baseband processor of claim 3 , wherein the one or more parameters comprise a specification of one or both of: one or more time and frequency resources for performing the one or more first and second measurements; and one or more time and frequency resources for transmitting the measurement report.
6. 6 . The baseband processor of claim 3 , wherein the one or more parameters comprise: a minimum absolute reportable shift; a maximum absolute reportable shift; and a quantization step size.
7. 7 . The baseband processor of claim 1 , wherein the measurement report specifies that the measurement report is invalid.
8. 8 . The baseband processor of claim 1 , wherein the device comprises a cellular transceiver installed on a high-speed train.
9. 9 . The baseband processor of claim 1 , wherein the configuration message comprises a channel state information (CSI)-ReportConfig message, and wherein the measurement report is comprised within a CSI transmission.
10. 10 . A non-transitory computer-readable memory medium comprising program instructions which, when executed by a processor, cause a first base station to: transmit a configuration message to a device, wherein the configuration message instructs the device to perform one or more first measurements on the first base station and one or more second measurements on a second base station; receive a measurement report from the device, wherein the measurement report comprises a differential of the first and second measurements, wherein the measurement report is received according to aperiodic timing with low latency, and wherein the measurement report is received with an acknowledgment message; and transmit communications to the device with pre-compensation, wherein the pre-compensation is based on the measurement report.
11. 11 . The non-transitory computer-readable memory medium of claim 10 , wherein the communications transmitted to the device are pre-compensated with half or all of the differential of the first and second measurements.
12. 12 . The non-transitory computer-readable memory medium of claim 10 , wherein the configuration message specifies one or more parameters of the measurement report.
13. 13 . The non-transitory computer-readable memory medium of claim 12 , wherein the one or more parameters comprise an instruction to perform a plurality of first and second measurements, and wherein the measurement report is based on an average of differentials between the plurality of first and second measurements.
14. 14 . A method, comprising: performing one or more first measurements on a first base station and one or more second measurements on a second base station; transmitting a measurement report to the first base station, wherein the measurement report comprises a differential between the first and second measurements, wherein the measurement report is provided according to aperiodic timing with low latency, and wherein the measurement report is provided with an acknowledgment message; and receiving communications from the first base station, wherein the communications are pre-compensated by the first base station based on the measurement report.
15. 15 . The method of claim 14 , the method further comprising: determining that the one or more first measurements have changed compared to previous measurements on the first base station by more than a predetermined threshold amount, wherein transmitting the measurement report is performed responsive to the determination that the one or more first measurements have changed compared to the previous measurements by more than the predetermined threshold amount.
16. 16 . The method of claim 14 , the method further comprising: subsequent to transmitting the measurement report, refraining from transmitting subsequent measurement reports to the base station until expiration of a prohibit period.
17. 17 . The method of claim 14 , the method further comprising: transmitting a scheduling request message to the base station on a physical uplink control channel (PUCCH); and receiving a PUCCH resource configuration or uplink grant from the base station, wherein the measurement report is transmitted according to the PUCCH resource configuration or uplink grant.
18. 18 . The method of claim 14 , the method further comprising: receiving an uplink grant from the base station, wherein the measurement report is transmitted within a media access control-control element (MAC-CE) message, and wherein the measurement report is transmitted according to the uplink grant.
19. 19 . The method of claim 14 , wherein the communications received from the first base station are pre-compensated with half or all of the differential of the first and second measurements.
20. 20 . The baseband processor of claim 1 , wherein the baseband processor is further configured to cause the wireless device to: subsequent to transmitting the measurement report, refrain from transmitting subsequent measurement reports to the base station until expiration of a prohibit period.

Description

PRIORITY CLAIM This application is a continuation of U.S. patent application Ser. No. 17/439,438, filed on Sep. 15, 2021, titled “Doppler Shift Estimate Reporting with Pre-Compensation”, which is a national stage application of International Application No. PCT/CN2021/091981, filed on May 7, 2021, titled “Doppler Shift Estimate Reporting with Pre-Compensation”, which are both hereby incorporated by reference in their entirety. The claims in the instant application are different than those of the parent application or other related applications. The Applicant therefore rescinds any disclaimer of claim scope made in the parent application or any predecessor application in relation to the instant application. The Examiner is therefore advised that any such previous disclaimer and the cited references that it was made to avoid, may need to be revisited. Further, any disclaimer made in the instant application should not be read into or against the parent application or other related applications. FIELD The present application relates to wireless communications, and more particularly to systems, apparatuses, and methods for providing Doppler shift information in a cellular communication system. DESCRIPTION OF THE RELATED ART Wireless communication systems are rapidly growing in usage. In recent years, wireless devices such as smart phones and tablet computers have become increasingly sophisticated. In addition to supporting telephone calls, many mobile devices (i.e., user equipment devices or UEs) now provide access to the internet, email, text messaging, and navigation using the global positioning system (GPS), and are capable of operating sophisticated applications that utilize these functionalities. Additionally, there exist numerous different wireless communication technologies and standards. Some examples of wireless communication standards include GSM, UMTS (associated with, for example, WCDMA or TD-SCDMA air interfaces), LTE, LTE Advanced (LTE-A), NR, HSPA, 3GPP2 CDMA2000 (e.g., 1×RTT, 1×EV-DO, HRPD, cHRPD), IEEE 802.11 (WLAN or Wi-Fi), BLUETOOTH™, etc. Effectively performing cellular communications may be complicated by Doppler shift in a high-mobility scenario such as cellular communications on a high-speed train (HST). In some deployments, the network may pre-compensate for the Doppler shift experienced by a rapidly moving UE. However, the network may not be aware of the degree of Doppler shift to be pre-compensated. Accordingly, improvements in the field are desired. SUMMARY Embodiments are presented herein of apparatuses, systems, and methods for a reporting device to transmit a Doppler measurement report to a cellular base station. The reporting device may be a cellular transceiver installed on a high-speed vehicle, and the cellular base station may be a 5G NR gNB, in some embodiments. In some embodiments, the reporting device receives a configuration message from a first base station specifying one or more parameters of a Doppler measurement report. In some embodiments, the reporting device performs one or more first Doppler measurements on the first base station and/or one or more second Doppler measurements on a second base station. The Doppler measurements measure a Doppler shift experienced by transmissions between the reporting device and the base stations. In some embodiments, the reporting device transmits the Doppler measurement report to the first and/or second base stations, where the Doppler measurement report is based on the one or more first Doppler measurements and the one or more parameters. The Doppler measurement report may specify a differential between Doppler shifts of the first and second base stations. The Doppler measurement report may be used by the first and/or second base stations to perform Doppler pre-compensation on transmissions to the reporting device. Note that the techniques described herein may be implemented in and/or used with a number of different types of devices, including but not limited to base stations, access points, cellular phones, portable media players, tablet computers, wearable devices, and various other computing devices. This Summary is intended to provide a brief overview of some of the subject matter described in this document. Accordingly, it will be appreciated that the above-described features are merely examples and should not be construed to narrow the scope or spirit of the subject matter described herein in any way. Other features, aspects, and advantages of the subject matter described herein will become apparent from the following Detailed Description, Figures, and Claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an exemplary (and simplified) wireless communication system, according to some embodiments; FIG. 2 illustrates an exemplary base station in communication with an exemplary wireless user equipment (UE) device, according to some embodiments; FIG. 3 illustrates an exemplary block diagram of a UE, according to some embodi