Procedures for hybrid beamforming in wireless systems

Patent metadata

Field	Value
Publication number	US-2025247134-A1
Application number	US-202318856733-A
Country	US
Kind code	A1
Filing date	Apr 14, 2023
Priority date	Apr 14, 2022
Publication date	Jul 31, 2025
Grant date	—

Abstract

Disclosed is a system and method implemented in a wireless transmit/receive unit (WTRU) for hybrid beamforming (HBF) in a wireless environment. The WTRU may be configured to receive an indication associated with enabling an HBF Type recommendation and/or receive a configuration associated with HBF processing. The WTRU may determine a channel matrix associated with a sub-band, determine one or more feedback overhead information, and/or determine one or more HBF precoders. The WTRU may determine a preferred HBF type based on a preconfigured set of parameters that is associated with the configuration related to HBF processing, and/or determine a set of Vandermonde phases based on the preconfigured set of parameters that is associated with the configuration related to HBF processing. The WTRU may report HBF information and/or angles associated with quantization information to a base station. The WTRU may receive a second configuration.

First claim

What is claimed is:

1 - 20 . (canceled)

21 . A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
receiving configuration information related to hybrid beamforming (HBF) processing; determining a channel matrix associated with a sub-band; deriving one or more HBF precoders using the channel matrix, wherein the HBF precoders are associated with the at least one constraint related to processing performance or feedback overhead; determining a preferred HBF type based on a preconfigured set of parameters associated with the configuration information related to HBF processing, wherein the preferred HBF type is a unity magnitude HBF type, a codebook based HBF type, or a Vandermonde constrained HBF type; and reporting, based on a first configuration related to HBF processing and the at least one constraint related to processing performance or feedback overhead associated with each of the plurality of HBF types, to a base station HBF information related to the preferred HBF type and associated parameters, wherein the HBF information indicates one or more of the preferred HBF Type, a HBF precoder associated with the preferred HBF type, or an effective rank associated with the preferred HBF type.

22 . The method of claim 21 , wherein the configuration information related to HBF processing comprises one or more of a payload size for reporting HBF-related information, a number of layers, a PRG size, a HBF Type, or an effective rank.

23 . The method of claim 21 , wherein the reporting to the base station further comprises reporting a Vandermonde based precoder derived from one or more measurements made by the WTRU.

24 . The method of claim 23 , wherein the Vandermonde based precoder is derived from among a plurality of Vandermonde based precoders.

25 . The method of claim 21 , wherein the configuration information is first configuration information, the method further comprising:
receiving a second configuration in response to the HBF information, wherein the second configuration comprises information related to the preferred HBF type or another HBF type; and performing HBF processing based on the second configuration.

26 . The method of claim 25 , wherein the preferred HBF type comprises a first preferred HBF type, the method further comprising:
switching, based on the second configuration and the at least one constraint related to processing performance or feedback overhead associated with each of the plurality of HBF types, from the first preferred HBF type to a second preferred HBF type of the plurality of HBF types; and reporting to the base station second HBF information related to the second preferred HBF type of the plurality of HBF types and associated parameters, wherein the second HBF information indicates at least one of the second preferred HBF Type, an HBF precoder associated with the second preferred HBF type, or an effective rank associated with the second preferred HBF type.

27 . The method of claim 26 , wherein switching from the from the first preferred HBF type to a second preferred HBF type of the plurality of HBF types is based on a trigger event.

28 . The method of claim 27 , wherein the trigger event comprises satisfying one or more of a performance threshold value, a threshold associated with a monitored value, and a preconfigured condition.

29 . The method of claim 21 , further comprising deriving the first configuration related to HBF processing based on one or more measurements made by the WTRU.

30 . The method of claim 21 , wherein the at least one constraint related to processing performance or feedback overhead comprises a measured angle.

31 . A wireless transmit/receive unit (WTRU), the WTRU comprising:
a processor configured to:
receive configuration information related to hybrid beamforming (HBF) processing;
determine a channel matrix associated with a sub-band;
derive one or more HBF precoders using the channel matrix, wherein the HBF precoders are associated with the at least one constraint related to processing performance or feedback overhead;
determine a preferred HBF type based on a preconfigured set of parameters associated with the configuration information related to HBF processing, wherein the preferred HBF type is a unity magnitude HBF type, a codebook based HBF type, or a Vandermonde constrained HBF type; and
report, based on a first configuration related to HBF processing and the at least one constraint related to processing performance or feedback overhead associated with each of the plurality of HBF types, to a base station HBF information related to the preferred HBF type and associated parameters, wherein the HBF information indicates one or more of the preferred HBF Type, a HBF precoder associated with the preferred HBF type, or an effective rank associated with the preferred HBF type.

32 . The WTRU of claim 31 , wherein the configuration information related to HBF processing comprises one or more of a payload size for reporting HBF-related information, a number of layers, a PRG size, a HBF Type, or an effective rank.

33 . The WTRU of claim 31 , wherein being configured to report to the base station further comprises being configured to report a Vandermonde based precoder derived from one or more measurements made by the WTRU.

34 . The WTRU of claim 33 , wherein the Vandermonde based precoder is derived from among a plurality of Vandermonde based precoders.

35 . The WTRU of claim 31 , wherein the configuration information is first configuration information, the processor further configured to:
receive a second configuration in response to the HBF information, wherein the second configuration comprises information related to the preferred HBF type or another HBF type; and perform HBF processing based on the second configuration.

36 . The WTRU of claim 35 , wherein the preferred HBF type comprises a first preferred HBF type, the processor further configured to:
switch, based on the second configuration and the at least one constraint related to processing performance or feedback overhead associated with each of the plurality of HBF types, from the first preferred HBF type to a second preferred HBF type of the plurality of HBF types; and report to the base station second HBF information related to the second preferred HBF type of the plurality of HBF types and associated parameters, wherein the second HBF information indicates at least one of the second preferred HBF Type, an HBF precoder associated with the second preferred HBF type, or an effective rank associated with the second preferred HBF type.

37 . The WTRU of claim 36 , wherein being configured to switch from the from the first preferred HBF type to a second preferred HBF type of the plurality of HBF types is based on a trigger event.

38 . The WTRU of claim 37 , wherein the trigger event comprises satisfying one or more of a performance threshold value, a threshold associated with a monitored value, and a preconfigured condition.

39 . The WTRU of claim 31 , wherein the processor is further configured to derive the first configuration related to HBF processing based on one or more measurements made by the WTRU.

40 . The WTRU of claim 31 , wherein the at least one constraint related to processing performance or feedback overhead comprises a measured angle.

Assignees

• Interdigital Patent Holdings Inc

Inventors

• Ibrahim Mohamed Salah
• Roy Arnab
• Malhotra Akshay
• Hamidi-Rad Shahab
• Beluri Mihaela

Classifications

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04B7/0456

  Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting · CPC title

• H04B7/0682

  using phase diversity (e.g. phase sweeping) · CPC title

• H04B7/0617 Primary

  for beam forming · CPC title

• H04B7/0478

  Special codebook structures directed to feedback optimisation · CPC title