Uplink Timing Adjustment Testing for 5G Beam Switching
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Solution Overview
Problem
Current 3GPP specifications lack an over-the-air test methodology to verify whether user equipment (UE) can satisfy the one-shot large uplink timing adjustment requirement for high-speed train scenarios in 5G new radio networks, which involve significant differential propagation delays during beam switching.
Innovation Solution
Implement over-the-air test methods, including MAC-CE and RRC-based procedures, to assess UE compliance with the one-shot large uplink timing adjustment requirement by configuring UEs with or without a flag enabling one-shot timing adjustment, and monitoring UL transmissions to verify timely adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If over-the-air test methodology is implemented to verify UE timing adjustment, then measurement precision is improved, but device complexity increases
Solution Approach 1:
A test gNB is introduced as an intermediary device that emulates the network side to perform over-the-air testing. This mediator provides a controlled environment for verifying UE timing adjustment without requiring actual network deployment, thereby improving measurement precision while managing complexity through simulation rather than full system integration
Solution Approach 2:
The test system creates a simplified copy of the actual 5G network environment using a test gNB that replicates essential network functions. This virtual copy allows for precise timing adjustment verification in a controlled setting, avoiding the complexity of testing in the full production network while maintaining measurement accuracy
2Adaptability or versatility
If beam switching is performed in high-speed train scenarios, then adaptability is improved, but reliability deteriorates due to significant differential propagation delays
Solution Approach 1:
The system performs preliminary timing adjustment calculations based on predicted beam switching events in high-speed train scenarios. By pre-computing the required timing adjustments before actual beam switching occurs, the system maintains reliability despite significant differential propagation delays, allowing seamless beam transitions without timing errors
Solution Approach 2:
The test system implements feedback mechanisms where the test gNB monitors uplink transmissions from the UE and provides correction information for timing adjustments. This closed-loop feedback ensures that beam switching maintains reliability by continuously verifying and correcting timing alignment, even in challenging high-speed train scenarios with large propagation delay differences
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for over-the-air test for uplink transmit timing adjustment in wireless systems. A method may receiving, from a testing device, a configuration with or without a flag indicating that an uplink timing adjustment is enabled. The method may also include detecting a first path of a synchronization signal block with a delay corresponding to the target beam. The method may further include adjusting an uplink transmission timing based on the detection of the first path of the synchronization signal block.