US-20260128831-A1 - MULTI-PORT PHASE CONTINUITY REFERENCE SIGNALS

US20260128831A1US 20260128831 A1US20260128831 A1US 20260128831A1US-20260128831-A1

Abstract

Methods, systems, and devices for wireless communications are described. Devices may exchange multi-port phase continuity reference signals. A receiving device may determine a phase coherence between a first port and a second port. Based on the phase coherence, the receiving device may select a configuration for phase continuity reference signals including an association between one or more first ports associated with communication of demodulation reference signals (DMRSs) and one or more second ports associated with communication of the phase continuity reference signals. The receiving device may receive one or more phase continuity reference signals in accordance with the configuration, the one or more phase continuity reference signals associated with estimation of a phase discontinuity between the first port and the second port. The receiving device may perform channel estimation for the first port and the second port in accordance with the one or more phase continuity reference signals.

Inventors

Chih-Hao Liu
Jing Sun
Jing Jiang

Assignees

QUALCOMM INCORPORATED

Dates

Publication Date: 20260507
Application Date: 20241101

Claims (20)

1 . A wireless communications device, comprising: one or more memories storing processor-executable code; and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the wireless communications device to: determine a phase coherence between a first port and a second port; select a configuration for phase continuity reference signals based at least in part on the phase coherence between the first port and the second port, the configuration comprising an association between one or more first ports associated with communication of demodulation reference signals (DMRSs) and one or more second ports associated with communication of the phase continuity reference signals; receive one or more phase continuity reference signals in accordance with the configuration, the one or more phase continuity reference signals associated with estimation of a phase discontinuity between the first port and the second port; and perform channel estimation for the first port and the second port in accordance with the one or more phase continuity reference signals.
2 . The wireless communications device of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the wireless communications device to: receive one or more radio resource control (RRC) messages indicating the phase coherence, wherein determining the phase coherence between the first port and the second port is based at least in part on the one or more RRC messages.
3 . The wireless communications device of claim 2 , wherein the one or more RRC messages comprise a capability report, an indication of one or more coherent ports, or both.
4 . The wireless communications device of claim 1 , wherein the one or more phase continuity reference signals are received via the one or more second ports comprising the second port in accordance with the configuration, the one or more second ports associated with the one or more first ports that comprise one or more active DMRS ports.
5 . The wireless communications device of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the wireless communications device to: identify one or more phase coherence groups based at least in part on the phase coherence between the first port and the second port, wherein: each phase coherence group of the one or more phase coherence groups comprises a first plurality of ports associated with the communication of the DMRSs, and the first plurality of ports correspond to a second plurality of ports associated with the communication of the phase continuity reference signals; and select, for each phase coherence group of the one or more phase coherence groups, a respective port of the second plurality of ports having a lowest port index.
6 . The wireless communications device of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the wireless communications device to: identify one or more phase coherence groups based at least in part on the phase coherence between the first port and the second port, wherein: each phase coherence group of the one or more phase coherence groups comprises one or more code division multiplexing (CDM) groups, each CDM group of the one or more CDM groups comprises a first plurality of ports associated with the communication of the DMRSs, and the first plurality of ports correspond to a second plurality of ports associated with the communication of the phase continuity reference signals; and select, for each CDM group of the one or more CDM groups of each phase coherence group, a respective port of the second plurality of ports having a lowest port index of the second plurality of ports.
7 . The wireless communications device of claim 1 , wherein, based at least in part on one or more ports associated with the communication of the DMRSs in a code division multiplexing (CDM) group being non-coherent or partial coherent, the configuration comprises: a third port and a fourth port associated with the communication of the phase continuity reference signals, the third port and the fourth port being associated with a fifth port and a sixth port of the one or more ports, and wherein, to receive the one or more phase continuity reference signals, the one or more processors are individually or collectively operable to execute the code to cause the wireless communications device to: receive a first phase continuity reference signal via a first resource element associated with the third port; and receive a second phase continuity reference signal via a second resource element associated with the fourth port.
8 . The wireless communications device of claim 7 , wherein the one or more ports associated with the communication of the DMRSs comprise active DMRS ports.
9 . The wireless communications device of claim 1 , wherein, based at least in part on one or more ports associated with the communication of the DMRSs in a code division multiplexing (CDM) group being coherent, the configuration comprises: a third port and a fourth port associated with the communication of the phase continuity reference signals, the third port and the fourth port being associated with a fifth port and a sixth port of the one or more ports, or the third port associated with the communication of the phase continuity reference signals, the third port having the association with the fifth port and the sixth port, and wherein, to receive the one or more phase continuity reference signals, the one or more processors are individually or collectively operable to execute the code to cause the wireless communications device to: receive a first phase continuity reference signal via a first resource element associated with the third port and the fourth port or associated with the third port.
10 . The wireless communications device of claim 9 , wherein the one or more ports associated with the communication of the DMRSs comprise active DMRS ports.
11 . The wireless communications device of claim 1 , wherein the configuration for the phase continuity reference signals is associated with a code division multiplexing (CDM) group.
12 . The wireless communications device of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the wireless communications device to: communicate a control message indicative of the configuration for the phase continuity reference signals based at least in part on the phase coherence between the first port and the second port, wherein receiving the one or more phase continuity reference signals is based at least in part on the control message.
13 . The wireless communications device of claim 12 , wherein: the control message comprises a mapping of the one or more first ports associated with the communication of the DMRSs to the one or more second ports associated with the communication of the phase continuity reference signals, and the one or more first ports comprise active DMRS ports.
14 . The wireless communications device of claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the wireless communications device to: receive an uplink control information (UCI) message indicative of a capability of a user equipment (UE) to adjust the phase coherence.
15 . A wireless communications device, comprising: one or more memories storing processor-executable code; and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the wireless communications device to: determine a phase coherence between a first port and a second port; select a configuration for phase continuity reference signals based at least in part on the phase coherence between the first port and the second port, the configuration comprising an association between one or more first ports associated with communication of demodulation reference signals (DMRSs) and one or more second ports associated with communication of the phase continuity reference signals; and transmit one or more phase continuity reference signals in accordance with the configuration, the one or more phase continuity reference signals associated with estimation of a phase discontinuity between the first port and the second port.
16 . The wireless communications device of claim 15 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the wireless communications device to: communicate one or more radio resource control (RRC) messages indicating the phase coherence, wherein determining the phase coherence between the first port and the second port is based at least in part on the one or more RRC messages.
17 . The wireless communications device of claim 16 , wherein the one or more RRC messages comprise a capability report, an indication of one or more coherent ports, or both.
18 . The wireless communications device of claim 15 , wherein the one or more phase continuity reference signals are transmitted via the one or more second ports comprising the first port in accordance with the configuration, the one or more second ports associated with the one or more first ports that comprise one or more active DMRS ports.
19 . The wireless communications device of claim 15 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the wireless communications device to: identify one or more phase coherence groups based at least in part on the phase coherence between the first port and the second port, wherein: each phase coherence group of the one or more phase coherence groups comprises a first plurality of ports associated with the communication of the DMRSs, and the first plurality of ports correspond to a second plurality of ports associated with the communication of the phase continuity reference signals; and select, for each phase coherence group of the one or more phase coherence groups, a respective port of the second plurality of ports having a lowest port index.
20 . The wireless communications device of claim 15 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the wireless communications device to: identify one or more phase coherence groups based at least in part on the phase coherence between the first port and the second port, wherein: each phase coherence group of the one or more phase coherence groups comprises one or more code division multiplexing (CDM) groups, each CDM group of the one or more CDM groups comprises a first plurality of ports associated with the communication of the DMRSs, and the first plurality of ports correspond to a second plurality of ports associated with the communication of the phase continuity reference signals; and select, for each CDM group of the one or more CDM groups of each phase coherence group, a respective port of the second plurality of ports having a lowest port index of the second plurality of ports.

Description

FIELD OF TECHNOLOGY The following relates to wireless communications, including multi-port phase continuity reference signals. BACKGROUND Wireless communications 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 capable of supporting 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 technologies 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 communications system may include one or more base stations, each supporting wireless communication for communication devices, which may be known as user equipment (UE). Wireless communications devices may exchange one or more reference signals. In some cases, wireless communications devices may exchange phase continuity reference signals. SUMMARY The systems, methods, and devices of this disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein. A method for wireless communications by a wireless communications device is described. The method may include determining a phase coherence between a first port and a second port, selecting a configuration for phase continuity reference signals based on the phase coherence between the first port and the second port, the configuration including an association between one or more first ports associated with communication of demodulation reference signals (DMRSs) and one or more second ports associated with communication of the phase continuity reference signals, receiving one or more phase continuity reference signals in accordance with the configuration, the one or more phase continuity reference signals associated with estimation of a phase discontinuity between the first port and the second port, and performing channel estimation for the first port and the second port in accordance with the one or more phase continuity reference signals. A wireless communications device for wireless communications is described. The wireless communications device 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 individually or collectively be operable to execute the code to cause the wireless communications device to determine a phase coherence between a first port and a second port, select a configuration for phase continuity reference signals based on the phase coherence between the first port and the second port, the configuration including an association between one or more first ports associated with communication of DMRSs and one or more second ports associated with communication of the phase continuity reference signals, receive one or more phase continuity reference signals in accordance with the configuration, the one or more phase continuity reference signals associated with estimation of a phase discontinuity between the first port and the second port, and perform channel estimation for the first port and the second port in accordance with the one or more phase continuity reference signals. Another wireless communications device for wireless communications is described. The wireless communications device may include means for determining a phase coherence between a first port and a second port, means for selecting a configuration for phase continuity reference signals based on the phase coherence between the first port and the second port, the configuration including an association between one or more first ports associated with communication of DMRSs and one or more second ports associated with communication of the phase continuity reference signals, means for receiving one or more phase continuity reference signals in accordance with the configuration, the one or more phase continuity reference signals associated with estimation of a phase discontinuity between the first port and the second port, and means for performing channel estimation for the first port and the second port in accordance with the one or more phase continuity reference signals. A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by one or more processors to determine a phase coherence between a first port and a second port, select a configuration for phase continuity reference signals based on the phas