Uplink Timing Asynchronism Handling in 5G Wireless Systems
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, maintaining uplink timing advance values for multiple beams is challenging due to the asynchronous nature of timing advance values across different transmission/reception points, leading to potential disruptions in connectivity when one or more timing advance values become invalid.
Innovation Solution
The user equipment (UE) maintains multiple timing advance values for each beam and refrains from flushing the HARQ buffer or clearing configurations if less than all timing advance values become invalid, allowing continued transmission on valid beams while ceasing on invalid ones, thereby ensuring seamless communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE flushes the HARQ buffer when a timing advance value becomes invalid, then uplink timing synchronization is maintained, but continuous data transmission is disrupted
Solution Approach 1:
The patent segments the timing advance management by maintaining separate timing advance values for different beams (first TA value for first beam, second TA value for second beam) and separately managing their validity. When one TA value becomes invalid, only the corresponding beam's transmission is affected, while other beams with valid TA values continue transmitting, thus avoiding system-wide disruption.
Solution Approach 2:
The patent applies local quality by allowing different beams to have different timing advance validity states. The UE evaluates each beam's TA value independently and maintains transmission quality on valid beams while discontinuing only on invalid beams, rather than applying a uniform flushing action to all beams.
2Reliability
If the UE clears all configurations when a timing advance value becomes invalid, then timing synchronization is maintained, but connection continuity on other beams is disrupted
Solution Approach 1:
The patent segments configuration management by associating configurations with specific beams and their corresponding TA values. When a TA value becomes invalid, only the configuration for that specific beam is cleared, while configurations for other beams remain intact, allowing selective configuration management.
Solution Approach 2:
The patent applies local quality by clearing configurations only for the beam whose TA value became invalid, rather than clearing all configurations system-wide. This localized approach preserves connection continuity on beams that still have valid timing advance values.
3Adaptability or versatility
If the UE maintains multiple timing advance values for multiple beams, then beam-specific timing control is achieved, but system complexity increases
Solution Approach 1:
The patent segments timing advance management into independent TA value entities for each beam. The UE maintains a first TA value for the first beam and a second TA value for the second beam, with separate validity tracking for each. This segmentation allows independent management of each beam's timing without affecting others.
Solution Approach 2:
The patent implements dynamic timing advance value management where the UE can independently update, validate, and manage multiple TA values based on beam-specific conditions. The system dynamically adjusts which beams are active based on TA validity without requiring complete system reconfiguration.
Data Source
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AI summary
Method and apparatus for handling upon UL timing asynchronism in a wireless communication system are disclosed herein. The user equipment (UE) maintains a timing advance (TA) value for each of a plurality of beams used for uplink transmissions to a cell, or a transmitter/reception point (TRP) operatively connected to a gNodeB (902). If less than all of the maintained TA values become invalid, then the UE will continue transmission on any beam for which the TA value remains valid, while discontinuing transmission on any beam with an invalid TA value (904).