Spatial-Prediction Beam Indication for Low-Latency UE Reception
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Solution Overview
Problem
The application of a beam indicated by a base station can be delayed when the user equipment (UE) has not recently measured the downlink reference signal (DL RS), leading to increased reception/measurement overhead for additional Rx beam selection and refinement processes.
Innovation Solution
A method involving beam indication with spatial prediction and configuration information for receiving physical signals/channels using a plurality of reference signals (RSs), including combining coefficients and coordinate information, to apply beams without additional RS overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a beam indication is provided for a DL RS that the UE has not recently measured, then the beam application latency is reduced, but the reception/measurement overhead increases due to additional Rx beam selection and refinement processes
Solution Approach 1:
The base station performs preliminary beam determination and selection before providing the beam indication to the UE. The base station pre-calculates the appropriate beam based on UE location, mobility, and channel conditions, so that the UE can directly apply the indicated beam without performing additional measurement and selection procedures, thereby reducing latency while controlling overhead
Solution Approach 2:
The base station acts as an intermediary that performs the complex beam measurement and selection operations on behalf of the UE. Instead of requiring the UE to independently measure and select beams (which increases overhead), the base station processes the beam selection and provides ready-to-apply beam indications to the UE, reducing the UE's measurement burden and latency
2Measurement precision
If additional Rx beam selection and refinement processes are performed for unmeasured beams, then the beam application accuracy is improved, but the processing time and complexity increase
Solution Approach 1:
The patent replaces the traditional mechanical measurement-based beam selection process with a base station-centric beam determination approach. Instead of the UE performing physical measurements and selections (mechanical process), the base station uses its superior processing capabilities, location information, and channel state knowledge to determine the optimal beam and指示 it to the UE, thereby maintaining accuracy while reducing UE processing complexity
Solution Approach 2:
The invention changes the operational parameters of the beam management system by shifting from UE-based measurement parameters to base station-based determination parameters. The base station uses parameters such as UE location, mobility state, and channel conditions to directly determine beam parameters, avoiding the need for UE to perform complex measurement and refinement procedures, thus reducing processing complexity while maintaining accuracy
Data Source
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AI summary
A method performed by a terminal in a wireless communication system, according to one embodiment of the present disclosure, may comprise the steps of: receiving configuration information; receiving beam indication; and receiving, on the basis of the beam indication, physical signals/channels from the same time, frequency, and space resources. The configuration information includes i) a configuration for beam indication related to spatial prediction, and ii) information related to a plurality of reference signals (RSs) for the beam indication. The beam indication indicates one or more RSs from among the plurality of RSs.