Beam Sweeping With Slot Aggregation for 5G Mobility
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Solution Overview
Problem
In high-mobility scenarios, frequent beam training and reporting lead to excessive network overhead and latency due to the need for constant beam tracking and alignment in 5G NR FR2 communications.
Innovation Solution
Implementing beam sweeping with slot aggregation, where PDSCH and PUSCH are repeated across multiple slots using multiple beams from multiple panels, reducing the need for frequent beam updates and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent beam training and reporting are performed to maintain beam alignment in high-mobility scenarios, then beam connection reliability is improved, but network overhead and latency increase excessively
Solution Approach 1:
The system performs preliminary beam sweeping across multiple slots before actual data transmission, establishing beam alignment in advance. This preliminary action allows the strongest beam to be identified and locked before high-mobility conditions cause connection degradation, reducing the need for frequent corrective beam training and reporting.
Solution Approach 2:
The system dynamically adapts beam sweeping configurations based on mobility conditions. During high-mobility periods, beam sweeping is performed more frequently across multiple slots to track rapid beam changes, while during stable periods, the frequency is reduced. This dynamic adaptation maintains reliability while optimizing network overhead.
2Measurement precision
If frequent beam training and reporting are performed to track beam changes in high-mobility scenarios, then beam alignment accuracy is improved, but latency increases due to processing delays
Solution Approach 1:
Beam sweeping is performed continuously across multiple consecutive slots without interruption, providing continuous beam measurement data. This continuous action eliminates gaps in beam tracking that would otherwise require additional correction measurements, reducing overall latency while maintaining alignment accuracy during high-mobility conditions.
Solution Approach 2:
Beam measurements are performed in advance across multiple slots before data transmission begins, establishing accurate beam alignment beforehand. This preliminary measurement approach avoids the need for time-critical beam adjustments during active transmission, reducing update latency while maintaining precision.
3Device complexity
If single beam is used per slot to simplify transmission, then device complexity is reduced, but signal quality and coverage deteriorate in high-mobility scenarios
Solution Approach 1:
The transmission process is segmented into distinct phases: beam sweeping phase across multiple slots where multiple beams are tested, and data transmission phase where the single strongest beam is used. This segmentation allows complex multi-beam operations to be confined to a preliminary phase, keeping actual transmission simple while ensuring signal quality through thorough beam selection.
Solution Approach 2:
Multiple beam measurements taken across different slots are merged and combined to identify the single strongest beam. By aggregating measurement data from multiple time instances, the system achieves reliable beam selection that accounts for high-mobility conditions, then uses this consolidated information for simplified single-beam transmission.
Data Source
AI summary
Methods and systems include beamformed wireless communications to and from a user equipment electronic device. During operation of the user equipment electronic device, a change in slot aggregation is made. Using the aggregated slots, the user equipment electronic device and/or a wireless network utilize beam sweeps to determine a best beam pairing by repeating a shared channel in the aggregated slots with a beam sweep of multiple beams between the user equipment electronic device and the wireless network.