CN-122029754-A - Doppler-based selection for multiple transmission-reception points

Abstract

Methods, systems, and devices for wireless communications are described. The method may include receiving one or more reference signals from a set of multiple transmit-receive points, generating a coherent joint transmit Precoding Matrix Indicator (PMI) associated with the set of multiple transmit-receive points based on the receiving of the one or more reference signals, wherein the coherent joint transmit PMI includes one or more doppler domain components for each transmit-receive point in the set of multiple transmit-receive points, and transmitting a report including an indication of the coherent joint transmit PMI.

Inventors

• DAI JING
• WU LIANGMING
• CHEN WANSHI
• XU HAO

Assignees

• 高通股份有限公司

Dates

Publication Date

20260512

Application Date

20231007

Claims (20)

1. 1. A User Equipment (UE), the UE comprising: One or more of the memories may be provided, the one or more memories store processor executable code; and One or more processors coupled with the one or more memories and operable, individually or collectively, to execute the code to cause the UE to: receiving one or more reference signals from a plurality of transmitting and receiving points; generating a coherent joint transmission Precoding Matrix Indicator (PMI) associated with the plurality of transmission reception points based at least in part on receiving the one or more reference signals, wherein the coherent joint transmission PMI includes one or more Doppler domain components for each of the plurality of transmission reception points, and A report is sent that includes an indication of the coherent joint transmit PMI.
2. 2. The UE of claim 1, wherein to send the report, the one or more processors are operable individually or collectively to execute the code to cause the UE to: A common doppler base selection is transmitted for all of the plurality of transmit receive points.
3. 3. The UE of claim 2, wherein to send the report, the one or more processors are operable individually or collectively to execute the code to cause the UE to: And transmitting the Doppler shift value of each of the plurality of transmitting and receiving points.
4. 4. The UE of claim 3, wherein: the Doppler shift value includes a non-oversampled Doppler shift value, and The number of samples of the non-oversampled doppler shift value is an integer value corresponding to a doppler base length.
5. 5. The UE of claim 3, wherein: The Doppler shift value includes an oversampled Doppler shift value, and The number of samples of the oversampled doppler shift value is a multiple of the doppler base length value.
6. 6. The UE of claim 3, wherein: The number of values of the Doppler shift value of each of the plurality of transmission and reception points is smaller than the total number of transmission and reception points of the plurality of transmission and reception points, and The number of values of the doppler shift value represents a relative shift relative to a reference transmit receive point of the plurality of transmit receive points.
7. 7. The UE of claim 3, wherein the doppler shift value for each of the plurality of transmit receive points is common to both polarizations of one or more transmit antennas of the plurality of transmit receive points.
8. 8. The UE of claim 3, wherein the doppler shift value for each of the plurality of transmit receive points is common to all of a plurality of layers associated with the PMI.
9. 9. The UE of claim 3, wherein the doppler shift value for each of the plurality of transmit receive points is layer-specific to a plurality of layers associated with the PMI.
10. 10. The UE of claim 1, wherein to send the report, the one or more processors are operable individually or collectively to execute the code to cause the UE to: An independent Doppler base selection is transmitted for each of the plurality of transmit receive points.
11. 11. The UE of claim 10, wherein to send the report, the one or more processors are operable individually or collectively to execute the code to cause the UE to: an oversampled group index is transmitted for each of the plurality of transmit-receive points.
12. 12. The UE of claim 11, wherein to send the report, the one or more processors are operable individually or collectively to execute the code to cause the UE to: and transmitting an oversampled group index that is less than a total number of transmit-receive points in the plurality of transmit-receive points, wherein the oversampled group index is relative to an oversampled group index corresponding to a reference transmit-receive point in the plurality of transmit-receive points.
13. 13. The UE of claim 11, wherein the oversampled group index for each of the plurality of transmit-receive points is common to both polarizations of one or more transmit antennas of the plurality of transmit-receive points.
14. 14. The UE of claim 11, wherein the independent doppler base selection for each of the plurality of transmit receive points, the oversampled group index for each of the plurality of transmit receive points, or both are layer specific for a plurality of layers associated with the PMI.
15. 15. The UE of claim 1, wherein to send the report, the one or more processors are operable individually or collectively to execute the code to cause the UE to: A strongest coefficient indicator is transmitted for each of a plurality of layers associated with the PMI, the strongest coefficient indicator indicating a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, wherein the strongest coefficient indicator is defined across all selected doppler bases associated with the one or more doppler domain components.
16. 16. The UE of claim 1, wherein to send the report, the one or more processors are operable individually or collectively to execute the code to cause the UE to: Transmitting, for each of a plurality of layers associated with the PMI, a strongest coefficient indicator indicating a strongest coefficient corresponding to a coefficient matrix associated with the coherent joint transmission PMI, wherein the strongest coefficient indicator is aligned with a zero doppler basis associated with the one or more doppler domain components.
17. 17. The UE of claim 1, wherein to send the report, the one or more processors are operable individually or collectively to execute the code to cause the UE to: A non-zero coefficient bitmap is transmitted in which frequency domain components and time domain components associated with the non-zero coefficient bitmap are reported as paired coefficients.
18. 18. The UE of claim 1, wherein to send the report, the one or more processors are operable individually or collectively to execute the code to cause the UE to: Transmitting a first phase bitmap having a size based on the number of the plurality of transmission and reception points and the number of layers associated with the PMI, and A second stage bitmap is sent, the second stage bitmap having non-zero coefficients for a subset of components of the first stage bitmap, the subset indicated by the first stage bitmap as non-zero.
19. 19. The UE of claim 1, wherein: The one or more reference signals received from the plurality of transmission reception points are configured with the same transmission periodicity, and The timing offset difference between reference signal transmissions is configured to be less than or equal to an offset threshold duration.
20. 20. The UE of claim 1, wherein the one or more reference signals received from the plurality of transmission reception points are configured with a transmission trigger having a trigger offset difference value that is less than or equal to a trigger threshold duration.

Description

Doppler-based selection for multiple transmission-reception points Technical Field The following relates to wireless communications, including doppler base selection for multiple transmit-receive points. Background Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be able to support communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems, such as Long Term Evolution (LTE) systems, LTE-advanced (LTE-a) systems, or LTE-a Pro systems, and fifth generation (5G) systems, which may be referred to as New Radio (NR) systems. These systems may employ techniques such as Code Division Multiple Access (CDMA), time Division Multiple Access (TDMA), frequency Division Multiple Access (FDMA), orthogonal FDMA (OFDMA), or discrete fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communication system may include one or more base stations, each supporting wireless communication for communication devices, which may be referred to as User Equipment (UEs). Disclosure of Invention The described technology relates to improved methods, systems, devices and apparatus supporting doppler-based selection for multiple transmission-reception points. For example, the described techniques provide for receiving one or more reference signals from a set of multiple transmit-receive points, generating a coherent joint transmit Precoding Matrix Indicator (PMI) associated with the set of multiple transmit-receive points based on receiving the one or more reference signals, wherein the coherent joint transmit PMI may include one or more Doppler domain components for each transmit-receive point in the set of multiple transmit-receive points, and transmitting a report including an indication of the coherent joint transmit PMI. A UE for wireless communication is described. The UE may include one or more memories storing processor executable code and one or more processors coupled with the one or more memories. The one or more processors may be operable, individually or collectively, to execute the code to cause the UE to receive one or more reference signals from a set of multiple transmit receive points, generate a coherent joint transmission associated with the set of multiple transmit receive points based on receiving the one or more reference signals, wherein the coherent joint transmission PMI includes one or more doppler domain components for each of the set of multiple transmit receive points, and transmit a report including an indication of the coherent joint transmission PMI. Another UE for wireless communication is described. The UE may include means for receiving one or more reference signals from a set of multiple transmit-receive points, means for generating a coherent joint transmit PMI associated with the set of multiple transmit-receive points based on receiving the one or more reference signals, wherein the coherent joint transmit PMI includes one or more doppler domain components for each transmit-receive point in the set of multiple transmit-receive points, and means for transmitting a report including an indication of the coherent joint transmit PMI. A non-transitory computer readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to receive one or more reference signals from a set of multiple transmit receive points, generate a coherent joint transmit PMI associated with the set of multiple transmit receive points based on receiving the one or more reference signals, wherein the coherent joint transmit PMI includes one or more doppler domain components for each transmit receive point in the set of multiple transmit receive points, and transmit a report including an indication of the coherent joint transmit PMI. In some examples of the methods, UEs, and non-transitory computer-readable media described herein, transmitting the report may include operations, features, components, or instructions to transmit a common doppler base selection for all of the set of multiple transmit receive points. In some examples of the methods, UEs, and non-transitory computer-readable media described herein, transmitting the report may include operations, features, components, or instructions to transmit a doppler shift value for each of the set of multiple transmit receive points. In some examples of the methods, UEs, and non-transitory computer-readable media described herein, the doppler shift value comprises a non-oversampled doppler shift value, and the number of samples of the non-oversampled doppler shift value may be an integer value corresponding to a doppler base length. In some examples of the methods, UEs, and non-transitory computer-reada