Uplink Synchronization via Transmission Gaps in Non-Terrestrial Networks
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Solution Overview
Problem
In non-terrestrial network scenarios, rapid movement of satellites relative to terminal devices causes frequent uplink (UL) out-of-sync issues due to changing propagation delays, despite timing advance (TA) adjustments.
Innovation Solution
A method for UL synchronization involves determining one or more transmission gaps in a UL shared channel resource, where each gap is M continuous time units subsequent to every N time units, and using these gaps to perform UL synchronization during UL shared channel transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If timing advance (TA) adjustment is used to ensure UL synchronization, then UL synchronization can be maintained under stable conditions, but frequent UL out-of-sync issues occur in non-terrestrial networks due to rapid propagation delay changes
Solution Approach 1:
The patent implements periodic UL synchronization operations at predetermined intervals during uplink data transmission. The terminal device performs UL synchronization using PUCCH or PUSCH resources at regular intervals, which allows the system to periodically correct timing deviations caused by propagation delay changes in non-terrestrial networks, thereby maintaining reliable UL synchronization despite rapid satellite movement
Solution Approach 2:
The patent configures UL synchronization resources (PUCCH/PUSCH) in advance before uplink data transmission begins. These pre-configured resources enable the terminal device to perform timing adjustments proactively at predetermined intervals, rather than waiting for synchronization to fail, thus preventing frequent UL out-of-sync issues before they occur
2Reliability
If UL synchronization is performed continuously to maintain synchronization in non-terrestrial networks, then UL out-of-sync frequency is reduced, but uplink transmission resources and time are consumed
Solution Approach 1:
Instead of continuous synchronization, the patent employs periodic synchronization at predetermined intervals during uplink transmission. This approach maintains adequate synchronization stability by correcting timing deviations at regular intervals while allowing normal uplink data transmission to proceed uninterrupted between synchronization points, thus minimizing time loss
Solution Approach 2:
The patent segments the uplink transmission timeline into data transmission intervals and synchronization intervals. During data transmission intervals, normal uplink communication proceeds without interruption, while synchronization operations are performed separately at predetermined intervals using dedicated PUCCH/PUSCH resources, thereby separating the functions and reducing mutual interference and time loss
Data Source
AI summary
A method for uplink (UL) synchronization, a communication apparatus, and a storage medium are disclosed in embodiments of the disclosure. The method for UL synchronization includes: determining, by a terminal device, one or more transmission gaps in a UL shared channel resource, where the UL shared channel resource is a resource occupied by a scheduled UL shared channel, and the one or more transmission gaps are each M continuous time units subsequent to every N time units in the UL shared channel resource, and performing UL synchronization by using the one or more transmission gaps during transmission of the UL shared channel.