US-20260128834-A1 - METHOD AND APPARATUS FOR WIRELESS COMMUNICATION

US20260128834A1US 20260128834 A1US20260128834 A1US 20260128834A1US-20260128834-A1

Abstract

The present application provides a method and an apparatus for wireless communication. The method includes: determining a first time domain window related to DMRS bundling used for estimation of an uplink channel, where a time length of the first time domain window is determined based on first information.

Inventors

Ling LYU
Zheng Zhao
Zhongzhi YANG

Assignees

QUECTEL WIRELESS SOLUTIONS CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20260105

Claims (20)

1 . A method for wireless communication, comprising: receiving, by a user equipment (UE) in a non terrestrial network (NTN), a time length of a first time domain window related to demodulation reference signal (DMRS) bundling used for estimation of an uplink channel; and responsive to an antenna-switching event that violates power consistency and phase continuity at the UE, terminating a current actual time domain window (A-TDW) and starting a new A-TDW at a time corresponding to the antenna-switching event, wherein the time length of the first time domain window related to DMRS bundling comprises the new A-TDW.
2 . The method according to claim 1 , wherein the time length of the first time domain window related to DMRS bundling comprises the current A-TDW.
3 . The method according to claim 1 , wherein the current A-TDW and the new A-TDW has a same length.
4 . The method according to claim 1 , wherein the time length of the first time domain window is determined based at least partly on first information, wherein the first information comprises a maximum duration over which the UE maintains phase continuity and power consistency, and the maximum duration is related to a capability of the UE to perform frequency pre-compensation continuously in non-terrestrial networks.
5 . The method according to claim 4 , wherein the first information comprises one or more of following information: a first time interval at which the UE performs antenna switching; a time length of a nominal time domain window; an event that causes phase discontinuity and power inconsistency; duration of repetitions of the uplink channel; or duration of segment transmission of the uplink channel.
6 . The method according to claim 4 , wherein the time length of the first time domain window of the DMRS bundling is further determined based on one or more of following information: a relative position between a satellite and the UE; or a timing drift corresponding to the satellite.
7 . The method according to claim 6 , wherein the relative position between the satellite and the UE comprises an elevation angle of the UE relative to the satellite, and the time length of the first time domain window of the DMRS bundling is positively related to the elevation angle.
8 . The method according to claim 4 , wherein the first information comprises a time length of a nominal time domain window, and at least one of the time length of the nominal time domain window or the time length of the first time domain window is carried in one or more of following information: a broadcast message, a radio resource control (RRC) message, or downlink control information (DCI).
9 . The method according to claim 4 , wherein the first information further comprises a first time interval at which the UE performs antenna switching, and a time at which the UE completes the antenna switching comprises a guard period configured by the UE for the antenna switching.
10 . The method according to claim 1 , wherein a time length T A-TDW of the new A-TDW meets following condition: T A - T ⁢ D ⁢ W = min ⁡ ( α × T C - T ⁢ D ⁢ W , β × ( T + M ) ) , wherein T C-TDW denotes a time length of a nominal time domain window, T denotes a time at which the UE completes antenna switching, M denotes a first time interval at which the UE performs antenna switching, and α and β denote adjustment factors.
11 . The method according to claim 1 , wherein a time length T A-TDW of the new A-TDW meets following condition: T A - T ⁢ D ⁢ W = min ⁡ ( α × T C - T ⁢ D ⁢ W , β × ( K + M ) ) , wherein T C-TDW denotes a time length of a nominal time domain window, K denotes a guard period at which the UE prepares for antenna switching, M denotes a first time interval at which the UE performs antenna switching, and α and β denote adjustment factors.
12 . The method according to claim 4 , wherein the maximum duration over which the UE maintains phase continuity is indicated by a capability report of the UE.
13 . A user equipment (UE), comprising: at least one processor; and one or more non-transitory computer-readable storage media coupled to the at least one processor and storing programming instructions for execution by the at least one processor, wherein the programming instructions, when executed, cause the UE to perform operations comprising: receiving, in a non terrestrial network (NTN), a time length of a first time domain window related to demodulation reference signal (DMRS) bundling used for estimation of an uplink channel; and responsive to an antenna-switching event that violates power consistency and phase continuity at the UE, terminating a current actual time domain window (A-TDW) and starting a new A-TDW at a time corresponding to the antenna-switching event, wherein the time length of the first time domain window related to DMRS bundling comprises the new A-TDW.
14 . The UE according to claim 13 , wherein the time length of the first time domain window related to DMRS bundling comprises the current A-TDW.
15 . The UE according to claim 13 , wherein the current A-TDW and the new A-TDW has a same length.
16 . The UE according to claim 13 , wherein the time length of the first time domain window is determined based at least partly on first information, wherein the first information comprises a maximum duration over which the UE maintains phase continuity and power consistency, and the maximum duration is related to a capability of the UE to perform frequency pre-compensation continuously in non-terrestrial networks.
17 . The UE according to claim 16 , wherein the first information comprises one or more of following information: a first time interval at which the UE performs antenna switching; a time length of a nominal time domain window; an event that causes phase discontinuity and power inconsistency; duration of repetitions of the uplink channel; or duration of segment transmission of the uplink channel.
18 . The UE according to claim 16 , wherein the time length of the first time domain window of the DMRS bundling is further determined based on one or more of following information: a relative position between a satellite and the UE; or a timing drift corresponding to the satellite.
19 . The UE according to claim 18 , wherein the relative position between the satellite and the UE comprises an elevation angle of the UE relative to the satellite, and the time length of the first time domain window of the DMRS bundling is positively related to the elevation angle.
20 . One or more non-transitory computer-readable media storing computer instructions, that when executed by one or more processors, cause a computing device to perform operations comprising: receiving, by a user equipment (UE) in a non terrestrial network (NTN), a time length of a first time domain window related to demodulation reference signal (DMRS) bundling used for estimation of an uplink channel; and responsive to an antenna-switching event that violates power consistency and phase continuity at the UE, terminating a current actual time domain window (A-TDW) and starting a new A-TDW at a time corresponding to the antenna-switching event, wherein the time length of the first time domain window related to DMRS bundling comprises the new A-TDW.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. application Ser. No. 18/987,826, filed on Dec. 19, 2024, which is a continuation of International Application No. PCT/CN2023/095833, filed on May 23, 2023. All of the afore-mentioned patent applications are hereby incorporated by reference in their entireties. TECHNICAL FIELD The present application relates to the field of communications technologies, and more specifically, to a method and an apparatus for wireless communication. BACKGROUND Some communications systems (such as a non-terrestrial network (non terrestrial network, NTN) system) feature a relatively large propagation delay and high device mobility. In such communications systems, when a device performs joint channel estimation based on demodulation reference signal (demodulation reference signal, DMRS) bundling, phase continuity in a specified time domain window may not be ensured. For example, when a terminal device improves a gain of uplink transmission through antenna switching, antenna switching performed by the terminal device may affect phase continuity and/or power consistency during DMRS bundling. SUMMARY The present application provides a method and an apparatus for wireless communication. Various aspects of embodiments of the present application are described below. According to a first aspect, a wireless communication method is provided, and the method includes: determining a first time domain window related to DMRS bundling used for estimation of an uplink channel, where a time length of the first time domain window is determined based on first information, and the first information includes one or more of following information: a first time interval at which a terminal device performs antenna switching; a time length of a nominal time domain window predefined/pre-configured by a network device; an event that causes phase discontinuity and power inconsistency; maximum duration during which the terminal device maintains phase continuity; duration of repetitions of the uplink channel; or duration of segment transmission of the uplink channel. According to a second aspect, an apparatus for wireless communication is provided, where the apparatus is a terminal device or a network device, and the apparatus includes: a determining unit, determining a first time domain window related to DMRS bundling used for estimation of an uplink channel, where a time length of the first time domain window is determined based on first information, and the first information includes one or more of following information: a first time interval at which a terminal device performs antenna switching; a time length of a nominal time domain window predefined/pre-configured by a network device; an event that causes phase discontinuity and power inconsistency; maximum duration during which the terminal device maintains phase continuity; duration of repetitions of the uplink channel; or duration of segment transmission of the uplink channel. According to a third aspect, a communication apparatus is provided and includes a memory and a processor, where the memory is configured to store a program, and the processor is configured to invoke the program in the memory to execute the method according to the first aspect. According to a fourth aspect, an apparatus is provided, and the apparatus includes a processor configured to invoke a program from a memory to execute the method according to the first aspect. According to a fifth aspect, a chip is provided, and the chip includes a processor and is configured to invoke a program from a memory to cause a device installed with the chip to execute the method according to the first aspect. According to a sixth aspect, a computer-readable storage medium is provided, and the computer-readable storage medium stores a program that causes a computer to execute the method according to the first aspect. According to a seventh aspect, a computer program product is provided, and the computer program product includes a program that causes a computer to execute the method according to the first aspect. According to an eighth aspect, a computer program is provided, where the computer program causes a computer to execute the method according to the first aspect. In embodiments of the present application, a terminal device or a network device may determine, based on first information, a time length of a first time domain window related to DMRS bundling. The first information may include a first time interval at which the terminal device performs antenna switching, so as to avoid that phase continuity and power consistency during DMRS bundling are disrupted by the antenna switching. It may be learned that determining the time length of the first time domain window based on a plurality of types of information may be beneficial to improving a gain of uplink channel estimation based on the DMRS bundling. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a wireless c