Beam Preference Feedback for Wireless Data Transmission
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Solution Overview
Problem
Wireless communication systems face challenges in maintaining effective data transmissions during high mobility scenarios due to the inability of user equipment (UE) to quickly adjust downlink receive beams, leading to communication termination.
Innovation Solution
The UE measures reference signals from a base station, identifies preferred or non-preferred beams, and transmits an indication of beam preference, allowing the base station to update active beams and associate them with mobility statuses, enabling the use of wider beams for improved communication robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station configures the UE with multiple possible beams, then communication reliability is improved, but signaling overhead increases
Solution Approach 1:
The base station pre-configures a set of candidate beams with their associated TCI states before data transmission. The UE performs measurements on these pre-configured beams and provides feedback, allowing the base station to select the appropriate beam for data transmission without extensive real-time signaling.
Solution Approach 2:
The same set of TCI states configured for beam management is reused for both beam indication and data transmission configuration. The TCI states serve multiple purposes: defining beam directions, indicating spatial parameters, and providing reference signal associations, thereby reducing the need for separate signaling mechanisms.
2Reliability
If the UE quickly adjusts downlink receive beams in high mobility scenarios, then communication continuity is improved, but the complexity of beam adjustment increases
Solution Approach 1:
The system dynamically adapts beam configurations based on UE mobility status. The base station associates different TCI states with different mobility statuses (e.g., stationary, slow mobility, fast mobility) and selects appropriate beams based on current UE movement conditions, allowing flexible adjustment without complex UE-side beam switching.
Solution Approach 2:
The UE measures reference signals on configured beams and provides beam preference feedback to the base station. This feedback mechanism allows the base station to identify the UE's mobility status and select appropriate beams from the configured set, reducing the complexity of real-time beam adjustment at the UE side.
3Reliability
If the base station uses wider beams for high mobility scenarios, then communication robustness is improved, but beam precision decreases
Solution Approach 1:
The base station configures multiple TCI states with different beam parameters (e.g., different spatial directions, different beam widths) and associates them with different mobility statuses. For high mobility scenarios, wider beams are configured to maintain robustness, while for low mobility scenarios, narrower precision beams are used. The system dynamically changes beam parameters based on UE mobility conditions.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The described techniques relate to improved methods, systems, devices, and apparatuses that support beam preference feedback for data transmissions. Generally, the described techniques provide for wireless communications at a user equipment (UE), that may perform a measurement of one or more reference signals from a base station. The UE may transmit to the base station an indication of a beam preference for communicating with the base station based on the measurement of the one or more reference signals. The UE may receive, based on the indication of the beam preference, downlink control information from the base station, the downlink control information including an indication of a beam for a data transmission. The UE may perform or receive the data transmission using the indicated beam.