Prioritized Beam Search Scheduling for 5G UE Latency
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently searching and detecting the best transmit-receive beam pair in 5G NR networks, particularly due to the large number of receive beams and the need to reduce latency and delay in beam selection.
Innovation Solution
The user equipment (UE) prioritizes the reception of synchronization signals using certain receive beams over others, determining which receive beam to use for each search opportunity to improve latency and delay in finding a suitable transmit-receive beam pair and cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE searches through all receive beams to find the best transmit-receive beam pair, then the reliability of beam selection is improved, but the latency and time consumption increase
Solution Approach 1:
The network configures the UE with a prioritized UE Rx beam set before the beam search procedure. This pre-configuration allows the UE to focus its search on a limited subset of receive beams that are most likely to provide good communication quality, thereby reducing the time required for beam search while maintaining reliable beam selection.
2Reliability
If the UE uses a large number of receive beams for comprehensive search, then the coverage and reliability are improved, but the device complexity and processing overhead increase
Solution Approach 1:
The complete set of receive beams is segmented into a prioritized subset and a non-prioritized remainder. The network configures only the prioritized subset (UE Rx beam set) for the beam search procedure, dividing the complex task of evaluating all beams into a manageable subset that achieves the same reliability with reduced complexity.
3Measurement precision
If the UE performs exhaustive beam search across all search opportunities, then the measurement precision is improved, but the time consumption and energy usage increase
Solution Approach 1:
Instead of performing exhaustive beam search across all possible receive beams, the UE performs partial action by searching only through the prioritized UE Rx beam set. This partial search is sufficient to achieve reliable beam selection and accurate quality measurement without the excessive time and energy costs of examining all beams.
Data Source
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AI summary
Aspects of the present disclosure provide a method for wireless communication at a user equipment (UE). The method includes selecting, for each of a plurality of periodic search opportunities, one receive beam of a plurality of receive beams for receiving at least one synchronization signal. The plurality of periodic search opportunities includes a plurality of regular search opportunities and a plurality of prioritized search opportunities. The plurality of receive beams includes at least one prioritized receive beam and at least one additional receive beam. The selecting includes selecting from the at least one prioritized receive beam for each of the plurality of prioritized search opportunities; and selecting from the plurality of receive beams for each of the plurality of regular search opportunities. The method further includes receiving, at each of the plurality of periodic search opportunities, the corresponding at least one synchronization signal using the corresponding selected receive beam.