CN-122029758-A - Transmitter pre-equalization for power reduction of XR device receiver

Abstract

A method and related apparatus for wireless communication at a User Equipment (UE) are provided. In the method, a UE obtains channel information of a side chain channel between the UE and a receiving device, and performs a pre-equalization process on a signal to be transmitted to the receiving device based on the channel information to obtain a pre-equalized signal. The UE then transmits the pre-equalized signal to the receiving device over the side-link channel.

Inventors

• T. Barack
• A. Tubul
• M. Levitsky
• D. Patz
• A swelder lofu

Assignees

• 高通股份有限公司

Dates

Publication Date

20260512

Application Date

20241010

Priority Date

20231101

Claims (20)

1. 1. An apparatus of wireless communication at a User Equipment (UE), the apparatus comprising: At least one memory, and At least one processor coupled to the at least one memory, and based at least in part on the information stored in the at least one memory, the at least one processor is configured to cause the UE to: obtaining channel information of a side link channel between the UE and the receiving equipment; Performing a pre-equalization process on a signal to be transmitted to the receiving apparatus based on the channel information to obtain a pre-equalized signal, and And transmitting the pre-equalized signal to the receiving equipment through the side chain channel.
2. 2. The apparatus of claim 1, further comprising a transceiver coupled to the at least one processor, wherein to obtain the channel information, the at least one processor is configured to obtain the channel information via the transceiver, alone or in any combination, and wherein to transmit the pre-equalized signal, the at least one processor is configured to cause the UE, alone or in combination: The pre-equalized signal is transmitted via a set of Orthogonal Frequency Division Multiplexing (OFDM) symbols using a sub-band full duplex (SBFD) scheme or a Frequency Division Duplex (FDD) scheme.
3. 3. The apparatus of claim 2, wherein the at least one processor, alone or in combination, is further configured to cause the UE to: Transmitting a pre-equalization indicator to the receiving device, the pre-equalization indicator indicating that the receiving device processes the pre-equalized signal using a reduced receiving process that skips an equalization process on the pre-equalized signal, and the pre-equalization indicator further comprising a method indicator indicating the pre-equalization process and side information for the reduced receiving process.
4. 4. The apparatus of claim 3, wherein the pre-equalization indicator is sent via one or more of: a Radio Resource Control (RRC) configuration, Downlink Control Information (DCI), or Medium Access Control (MAC) -control element (MAC-CE).
5. 5. The apparatus of claim 3, wherein the at least one processor, alone or in combination, is further configured to cause the UE to: receiving, from the receiving device, a receiver capability indicator indicating support of the pre-equalization procedure by the receiving device, and wherein to perform the pre-equalization procedure, the at least one processor is configured to cause the UE to: the pre-equalization process is performed in response to the receiver capability indicator.
6. 6. The apparatus of claim 2, wherein the at least one processor is configured, alone or in combination, to cause the UE to: A dedicated reference signal is sent to the receiving device, wherein the channel information is based on the dedicated reference signal.
7. 7. The apparatus of claim 6, wherein the channel information comprises receive (Rx) Channel State Information (CSI) associated with the sidelink channel.
8. 8. The apparatus of claim 7, wherein to obtain the channel information, the at least one processor is configured to cause the UE to: receiving a set of received samples from the receiving device based on the dedicated reference signal, and The Rx CSI associated with the side chain channel is identified based on the set of received samples.
9. 9. The apparatus of claim 7, wherein to obtain the channel information, the at least one processor is configured to cause the UE to: the Rx CSI associated with the side link channel is received from the receiving device, wherein the Rx CSI is based on the dedicated reference signal.
10. 10. The apparatus of claim 7, wherein the channel information further comprises channel noise information comprising a noise covariance matrix associated with the side-link channel.
11. 11. The apparatus of claim 10, wherein to obtain the channel information, the at least one processor is further configured, alone or in combination, to cause the UE to: receiving a set of received samples from the receiving device based on the dedicated reference signal, and The channel noise information is identified based on the set of received samples.
12. 12. The apparatus of claim 10, wherein to obtain the channel information, the at least one processor is further configured, alone or in combination, to cause the UE to: The channel noise information is received from the receiving device.
13. 13. The apparatus of claim 2, wherein the pre-equalization process comprises a linear pre-equalization process comprising one or more of: Zero-forcing (ZF) pre-equalization, or Minimum Mean Square Error (MMSE) pre-equalization.
14. 14. The apparatus of claim 2, wherein the pre-equalization process comprises a nonlinear pre-equalization process comprising one or more of: Thomson-Ha Laxi ma (THP) zero forcing (THP-ZF) pre-equalization, or THP-minimum mean square error (THP-MMSE) pre-equalization.
15. 15. The apparatus of claim 2, wherein the at least one processor, alone or in combination, is further configured to cause the UE to: evaluating the validity of the channel information for performing the pre-equalization procedure, wherein to perform the pre-equalization procedure, the at least one processor is configured to cause the UE, alone or in combination: Performing the pre-equalization process in response to the channel information being effective to perform the pre-equalization process, and wherein the at least one processor, alone or in combination, is further configured to cause the UE to: skipping the pre-equalization process on the signal in response to the channel information being ineffective to perform the pre-equalization process, and The signal is transmitted to the receiving device for the receiving device to perform a conventional equalization process on the signal in response to the channel information being ineffective to perform the pre-equalization process.
16. 16. The apparatus of claim 1, wherein the at least one processor, alone or in combination, is further configured to cause the UE to: A communication is received from a network entity for the receiving device, wherein the pre-equalized signal from the UE to the receiving device comprises the communication from the network entity for the receiving device.
17. 17. An apparatus for wireless communication at a receiving device, the apparatus comprising: At least one memory, and At least one processor coupled to the at least one memory and based at least in part on information stored in the at least one memory, the at least one processor is configured to cause the receiving device, alone or in any combination, to: Receiving a dedicated reference signal from a User Equipment (UE); Transmitting channel information of a side link channel between the UE and the receiving device to the UE based on the dedicated reference signal; receiving a pre-equalized signal from the UE, and The pre-equalized signal is processed using a simplified receive process that skips an equalization process for the pre-equalized signal.
18. 18. The apparatus of claim 17, further comprising a transceiver coupled to the at least one processor, wherein to receive the dedicated reference signal, the at least one processor is configured to receive the dedicated reference signal via the transceiver alone or in any combination, and wherein to receive the pre-equalized signal, the at least one processor is configured to cause the receiving device to: the pre-equalized signal is received via a set of Orthogonal Frequency Division Multiplexing (OFDM) symbols using a sub-band full duplex (SBFD) scheme or a Frequency Division Duplex (FDD) scheme.
19. 19. The apparatus of claim 18, wherein the at least one processor is configured, alone or in combination, to cause the receiving device to: A pre-equalization indicator indicating the reduced reception procedure for the pre-equalized signal is received from the UE, wherein the pre-equalization indicator further includes a method indicator indicating a pre-equalization procedure performed on the pre-equalized signal and side information for the reduced reception procedure.
20. 20. The apparatus of claim 19, wherein the pre-equalization indicator is received via one or more of: a Radio Resource Control (RRC) configuration, Downlink Control Information (DCI), or Medium Access Control (MAC) -control element (MAC-CE).

Description

Transmitter pre-equalization for power reduction of XR device receiver Cross Reference to Related Applications The present application claims the benefit of U.S. non-provisional patent application serial No. 18/499,915, entitled "TRANSMITTER PRE-EQUALIZATION FOR POWER REDUCTION OF XR DEVICE RECEIVER (transmitter pre-equalization for reduced power of XR device receiver)" filed on 1,11, 2023, which is expressly incorporated herein by reference in its entirety. Technical Field The present disclosure relates generally to communication systems, and more particularly to equalization for wireless communication with an augmented reality (XR) device receiver. Background Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. A typical wireless communication system may employ multiple-access techniques capable of supporting communication with multiple users by sharing the available system resources. Examples of such multiple-access techniques 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, and time division synchronous code division multiple access (TD-SCDMA) systems. These multiple access techniques have been employed in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate at the urban, national, regional, and even global levels. One example telecommunications standard is 5G New Radio (NR). The 5G NR is part of the ongoing mobile broadband evolution promulgated by the third generation partnership project (3 GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the internet of things (IoT)) and other requirements. The 5G NR includes services associated with enhanced mobile broadband (eMBB), large-scale machine-type communications (mMTC), and ultra-reliable low-latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. Further improvements in the 5G NR technology are needed. Furthermore, these improvements may also be applicable to other multiple access techniques and telecommunication standards employing these techniques. Disclosure of Invention The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects. This summary does not identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later. In an aspect of the disclosure, methods, computer-readable media, and apparatuses for wireless communication at a User Equipment (UE) are provided. The apparatus may include at least one memory and at least one processor coupled to the at least one memory. Based at least in part on the information stored in the at least one memory, the at least one processor, alone or in any combination, may be configured to obtain channel information for a side link channel between the UE and a receiving device, perform a pre-equalization process on a signal to be transmitted to the receiving device based on the channel information to obtain a pre-equalized signal, and transmit the pre-equalized signal to the receiving device over the side link channel. In an aspect of the disclosure, a method, computer-readable medium, and apparatus for wireless communication at a receiving device are provided. The apparatus may include at least one memory and at least one processor coupled to the at least one memory. Based at least in part on the information stored in the at least one memory, the at least one processor, alone or in any combination, may be configured to receive a dedicated reference signal from a UE, transmit channel information for a side link channel between the UE and the receiving device to the UE based on the dedicated reference signal, receive a pre-equalized signal from the UE, and process the pre-equalized signal using a simplified reception process. The simplified receiving process skips the equalization process for the pre-equalized signal. To the accomplishment of the foregoing and related ends, one or more aspects may comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed. Drawings Fig. 1 is a diagram illustrating an example