Active BWP Determination Using Reference Signal Associations
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Solution Overview
Problem
The determination of an active bandwidth part (BWP) in wireless communication systems, particularly in non-terrestrial networks (NTN), is restricted by factors such as the association between BWP and reference signals, leading to challenges in BWP switching and increased signaling overhead.
Innovation Solution
A method for determining an active BWP based on the association between BWP and reference signals (RS), including aperiodic sounding reference signals (SRS), synchronization signal blocks (SSB), and channel state information (CSI)-RS, using configuration information and DCI to determine time domain offsets and resource configurations for various transmission types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If simultaneous DL and UL BWP switching mechanism is used to save signaling overhead, then signaling overhead is reduced, but BWP determination becomes restricted by multiple factors including RS association
Solution Approach 1:
The system enables self-service by allowing the UE to autonomously determine the active BWP based on predefined rules and associations between BWPs and reference signals. The UE uses configuration information received from the network and applies determination rules to select the appropriate BWP without requiring additional dynamic signaling, thus reducing signaling overhead while maintaining deterministic BWP selection
Solution Approach 2:
The patent changes the parameter of BWP determination from dynamic signaling-based to rule-based determination using reference signal associations. By establishing fixed associations between BWPs and reference signals (CSI-RS, SSB, SRS) and using determination rules that consider factors like beam management purposes and spatial relations, the system transforms the determination mechanism to reduce signaling requirements
2Measurement precision
If BWP switching is performed based on multiple factors including RS association, then BWP selection accuracy is improved, but scheduling flexibility is reduced
Solution Approach 1:
The system introduces dynamics by allowing flexible configuration of BWP-RS associations and determination rules through higher-layer signaling. The network can configure multiple BWP pairs with different reference signal associations, and the UE can dynamically select among them based on received DCI indications and current communication requirements, thus maintaining both accuracy and flexibility
Solution Approach 2:
The patent segments the BWP determination process into multiple independent components: BWP configuration with reference signal associations, determination rules for different scenarios (beam management, data transmission, random access), and scenario-specific parameters. This segmentation allows each component to be optimized independently while maintaining overall system flexibility and accuracy
Data Source
AI summary
Embodiments of the present application are related to a method and apparatus for determining active bandwidth part (BWP). According an embodiment of the present application, an exemplary method includes: receiving first configuration information indicating association between BWP and reference signal (RS); determining a first RS, which is indicated by second configuration information, or user equipment (UE) selected, or predefined in specification(s); and determining an active BWP based on the first RS and the association between BWP and RS.