Beam Application Time Determination with Bandwidth Part Switching
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Solution Overview
Problem
In wireless communications, existing techniques face challenges in determining an unambiguous beam application time (BAT) when both beam switching and bandwidth part (BWP) switching occur, leading to inefficiencies and reliability issues due to differences in sub-carrier spacing between the initial and new BWPs.
Innovation Solution
The proposed solution involves determining the beam application time based on the sub-carrier spacing of the first or second BWP, or a combination of both, to ensure efficient and unambiguous timing for beam switching, even when BWP switching is present, by using parameters such as minimum or maximum sub-carrier spacing, or a preconfigured reference spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam switching is performed during BWP switching, then beamforming efficiency is improved, but beam application time becomes ambiguous due to different sub-carrier spacing
Solution Approach 1:
The patent changes the reference parameter for beam application time from the sub-carrier spacing of the current BWP to a fixed reference sub-carrier spacing (e.g., 15 kHz). This parameter substitution resolves the ambiguity by providing a consistent reference that does not change during BWP switching, allowing reliable beam application time determination even when BWPs with different sub-carrier spacings are involved
Solution Approach 2:
The patent introduces a reference sub-carrier spacing as an intermediary element that mediates between the beam switching timing requirements and the BWP switching operations. This reference spacing acts as a common denominator that allows both beam and BWP switching to be coordinated without direct conflict, enabling the system to determine beam application time unambiguously
2Measurement precision
If beam application time is based on sub-carrier spacing of the new BWP, then timing accuracy is improved, but system complexity increases due to multiple spacing configurations
Solution Approach 1:
The patent extracts the sub-carrier spacing parameter from the dynamic BWP configuration and replaces it with a fixed reference value. By taking out the variable spacing parameter and substituting it with a constant reference, the system achieves consistent timing accuracy without the complexity of managing multiple spacing configurations during BWP switching
Data Source
AI summary
Methods, systems, and devices for wireless communications are described that provide for determination of timing for application of a beam based on a beam switch indication and a switch of a bandwidth part (BWP) of a frequency bandwidth that is used for communications between a user equipment (UE) and a network entity. A UE may receive a beam switch indication to switch beamformed wireless communications from a first beam to a second beam. The UE may also determine that a BWP switch is to be performed prior to using the second beam, and may use the second beam and the new BWP based on a beam application time associated with the second beam, where the beam application time is based on a channel parameter (e.g., a sub-carrier spacing) of the first bandwidth part or the second bandwidth part.