Wide-Beam CSI Reporting Based on Narrow-Beam Detection
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining beam quality due to rapid mobility of user equipment (UE), leading to frequent beam switches and increased signaling overhead in channel state information (CSI) reports, which can degrade channel quality information (CQI) due to the base station's unawareness of appropriate narrow beam usage.
Innovation Solution
UEs identify a narrow beam with high beamforming gain and determine wide beam parameters based on this narrow beam, reporting a wide beam direction and width, which are used by the base station to configure subsequent communications, reducing signaling overhead and improving beam quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If narrow beams are used for communications, then beamforming gain is improved, but beam quality degrades due to UE mobility between reference signal reports
Solution Approach 1:
The system dynamically adapts beam width based on UE mobility conditions. For high mobility UEs, wider beams are selected to maintain connection stability; for low mobility UEs, narrower beams provide higher gain. This dynamic adjustment resolves the contradiction between beamforming gain and beam quality reliability.
Solution Approach 2:
The invention changes the beam width parameter from fixed narrow to variable (wide or narrow) based on mobility assessment. By modifying this key parameter, the system achieves both high beamforming gain when appropriate and maintains beam quality reliability under mobility conditions.
2Reliability
If wide beams are used for high mobility UEs, then beam quality is improved, but beamforming gain decreases
Solution Approach 1:
The system dynamically selects between narrow and wide beams based on real-time mobility assessment. This dynamic behavior ensures that wide beams are used only when necessary for high mobility UEs, while narrow beams serve low mobility UEs, optimizing the trade-off between beam quality and beamforming gain.
Solution Approach 2:
The beam width parameter is changed from always narrow to conditionally wide or narrow based on mobility. This parameter adaptation allows the system to maintain beamforming gain for stationary UEs while improving beam quality for mobile UEs.
3Productivity
If narrow beams are used, then spectral efficiency is improved, but signaling overhead increases due to frequent beam switches
Solution Approach 1:
The system dynamically determines beam width based on mobility, reducing unnecessary beam switches for high mobility UEs by using wider beams. This dynamic adaptation decreases signaling overhead while maintaining spectral efficiency for appropriate scenarios.
4Device complexity
If base station uses reported narrow beam without awareness, then CSI report simplicity is maintained, but channel quality information degrades
Solution Approach 1:
The invention introduces mobility feedback from UE to base station, enabling the BS to understand whether the reported narrow beam is appropriate. This feedback mechanism improves channel quality information reliability while maintaining relatively simple CSI reporting structures.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described in which a user equipment (UE) may determine wide beam parameters for beamformed communications with a base station based on an identified narrow beam. A UE may receive a reference signal from a base station and identify a narrow beam based on measurements of the received reference signal. Based on the identified narrow beam, the UE may determine a set of wide beam parameters for a wide beam that is to be used for communications between the UE and the base station. The wide beam may have a beam direction that corresponds to a direction of the identified narrow beam, and may have a beam width that is determined as a multiple of a beam width of the identified narrow beam (e.g., x times the beam width of the narrow beam).