US-12627434-B2 - Cross-phase tracking reference signal rate matching for multiple coordinated transmit receive points with multiple downlink control information

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first network node may receive second phase tracking reference signal (PTRS) configuration information for a second PTRS that is associated with a second network node. The first network node may transmit a physical downlink shared channel (PDSCH) that includes a first PTRS that is based at least in part on first PTRS configuration information, the PDSCH being based at least in part on cross-PTRS rate matching and the second PTRS configuration information. Numerous other aspects are described.

Inventors

• Gaurav Nigam
• Jae Ho Ryu
• Mostafa Khoshnevisan
• Jae Won Yoo
• Manish Jain
• Hari Sankar

Assignees

• QUALCOMM INCORPORATED

Dates

Publication Date

20260512

Application Date

20230526

Claims (20)

1. 1 . An apparatus for wireless communication at a first network node, comprising: one or more memories; and one or more processors, coupled to the one or more memories, configured to: receive second phase tracking reference signal (PTRS) configuration information for a second PTRS that is associated with a second network node; transmit a physical downlink shared channel (PDSCH) that includes a first PTRS that is based at least in part on first PTRS configuration information, the PDSCH being based at least in part on cross-PTRS rate matching and the second PTRS configuration information; and transmit, in a downlink control information (DCI) transmission, an indication of the second PTRS configuration information, wherein a value associated with the DCI transmission indicates that a cross-PTRS rate matching mode is enabled, and wherein the DCI transmission includes a single bit field that indicates the value.
2. 2 . The apparatus of claim 1 , wherein the one or more processors are further configured to: perform PDSCH rate matching based at least in part on a resource location of the second PTRS.
3. 3 . The apparatus of claim 2 , wherein the one or more processors are further configured to: derive the resource location of the second PTRS based at least in part on the second PTRS configuration information.
4. 4 . The apparatus of claim 1 , wherein the one or more processors are further configured to: transmit an indication of the first PTRS configuration information to the second network node.
5. 5 . The apparatus of claim 1 , wherein the DCI transmission comprises a PTRS resource field associated with the second PTRS.
6. 6 . The apparatus of claim 5 , wherein the one or more processors are configured to: indicate at least part of the second PTRS configuration information in the PTRS resource field.
7. 7 . The apparatus of claim 1 , wherein the one or more processors, to transmit the indication, are configured to: set the single bit field to the value, wherein the value indicates that the cross-PTRS rate matching operating mode is enabled.
8. 8 . The apparatus of claim 5 , wherein the PTRS resource field indicates a time-domain density associated with the second PTRS.
9. 9 . The apparatus of claim 8 , wherein the one or more processors, to indicate at least part of second PTRS configuration information in the PTRS resource field, are configured to: indicate the time-domain density in the PTRS resource field based at least in part on at least one of: a modulation and coding scheme (MCS) threshold, or a time-domain density relationship with the first PTRS.
10. 10 . The apparatus of claim 9 , wherein the PTRS resource field indicates a resource element offset, wherein the first PTRS is associated with a demodulation reference signal (DMRS) port, and wherein the one or more processors, to indicate at least part of the second PTRS configuration information in the PTRS resource field, are configured to: indicate, as the resource element offset, a relative resource element offset that is based at least in part on a nominal resource element offset associated with the DMRS port.
11. 11 . The apparatus of claim 1 , wherein the one or more processors are further configured to: transmit an indication of a relative resource element offset associated with the second PTRS that is based at least in part on the first PTRS.
12. 12 . The apparatus of claim 1 , wherein the one or more processors are further configured to: receive a user equipment (UE) report that indicates a cross-PTRS operating condition associated with a UE; and set an operating mode of the cross-PTRS rate matching based at least in part on the cross-PTRS operating condition.
13. 13 . The apparatus of claim 12 , wherein the UE report indicates, as the cross-PTRS operating condition, at least one of: a correlation metric associated with the first network node and the second network node, a PDSCH transmission rank, or a modulation and coding scheme, or the cross-PTRS rate matching mode, wherein the cross-PTRS rate matching mode is UE-selected.
14. 14 . An apparatus for wireless communication at a user equipment (UE), comprising: one or more memories; and one or more processors, coupled to the one or more memories, configured to: receive a first indication of first phase tracking reference signal (PTRS) configuration information for a first PTRS that is associated with a first physical downlink shared channel (PDSCH) transmitted by a first network node; receive, in a downlink control information (DCI) transmission, a second indication of second PTRS configuration information for a second PTRS that is associated with a second PDSCH that is transmitted by a second network node, wherein a value associated with the DCI transmission indicates that a cross-PTRS rate matching operating mode is enabled, and wherein the DCI transmission includes a single bit field that indicates the value; and recover the first PTRS and the second PTRS based at least in part on the first PTRS configuration information, the second PTRS configuration information, and the cross-PTRS rate matching operating mode.
15. 15 . The apparatus of claim 14 , wherein the one or more processors are further configured to: recover the first PTRS from the first PDSCH based at least in part on first PDSCH rate matching that is based at least in part on a second resource location of the second PTRS in the second PDSCH; and recover the second PTRS from the second PDSCH based at least in part on second PDSCH rate matching that is based at least in part on a first resource location of the first PTRS in the first PDSCH.
16. 16 . The apparatus of claim 14 , wherein the one or more processors are further configured to: receive a second DCI transmission from the first network node that indicates the first PTRS configuration information for the first PTRS; and receive a third DCI transmission from the second network node that indicates the second PTRS configuration information for the second PTRS.
17. 17 . The apparatus of claim 14 , wherein the one or more processors, to receive the DCI transmission are further configured to: receive, in the DCI transmission and from the first network node, the second indication of the second PTRS configuration information.
18. 18 . The apparatus of claim 14 , wherein the DCI transmission comprises a PTRS resource field associated with the second PTRS.
19. 19 . The apparatus of claim 18 , wherein the the one or more processors are configured to: indicate at least part of the second PTRS configuration information in the PTRS resource field.
20. 20 . The apparatus of claim 14 , wherein the DCI comprises a PTRS resource field associated with the second PTRS, and wherein the PTRS resource field indicates at least part of the second PTRS configuration information in the PTRS resource field.

Description

FIELD OF THE DISCLOSURE Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for cross-phase tracking reference signal rate matching for multiple coordinated transmit receive points with multiple downlink control information. BACKGROUND Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, 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 network may include one or more network nodes that support communication for wireless communication devices, such as a user equipment (UE) or multiple UEs. A UE may communicate with a network node via downlink communications and uplink communications. “Downlink” (or “DL”) refers to a communication link from the network node to the UE, and “uplink” (or “UL”) refers to a communication link from the UE to the network node. Some wireless networks may support device-to-device communication, such as via a local link (e.g., a sidelink (SL), a wireless local area network (WLAN) link, and/or a wireless personal area network (WPAN) link, among other examples). The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs to communicate on a municipal, national, regional, and/or global level. New Radio (NR), which may be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the 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, using CP-OFDM and/or single-carrier frequency division multiplexing (SC-FDM) (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink, as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR, and other radio access technologies remain useful. SUMMARY Some aspects described herein relate to a method of wireless communication performed by a first network node. The method may include receiving second phase tracking reference signal (PTRS) configuration information for a second PTRS that is associated with a second network node. The method may include transmitting a physical downlink shared channel (PDSCH) that includes a first PTRS that is based at least in part on first PTRS configuration information, the PDSCH being based at least in part on cross-PTRS rate matching and the second PTRS configuration information. Some aspects described herein relate to a method of wireless communication performed by a user equipment (UE). The method may include receiving a first indication of first PTRS configuration information for a first PTRS that is associated with a first PDSCH transmitted by a first network node. The method may include receiving a second indication of second PTRS configuration information for a second PTRS that is associated with a second PDSCH that is transmitted by a second network node. The method may include recovering the first PTRS and the second PTRS based at least in part on the first PTRS configuration information, the second PTRS configuration information, and a cross-PTRS rate matching operating mode. Some aspects described herein relate to an apparatus for wireless communication at a first network node. The apparatus may include one or more memories and one or more processors coupled to the one or more memories. The one or more processors may be configured to receive second PTRS configuration information for a second PTRS that is associated with a second network node. The one or more processors may be configured to transmit a PDSCH that includes a first PTRS that is based at least in part on first PTRS configuration information, the PDSCH being based at least in part on cross-PTRS rate matching and the second PTRS configuration inform