Terminal Device Synchronization Switching for Carrier Stability
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Solution Overview
Problem
In 3GPP radio communication systems, the synchronization state in one carrier frequency band can be lost when synchronization fails in another carrier frequency band, leading to unstable communication quality, especially when new carrier types (NCTs) are used, as they may not be synchronized with legacy carriers and rely on limited synchronization signals.
Innovation Solution
A terminal device and communication control method that establish synchronization in a second frequency band using a synchronization signal from a third frequency band synchronized with the first frequency band, and vice versa, before the synchronization fails in the second frequency band, to stabilize communication quality by switching the primary anchor point from one carrier to another.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE establishes synchronization in a second frequency band by a synchronization signal transmitted in the second frequency band and establishes synchronization in the first frequency band by utilizing a synchronization result in the second frequency band, then the device complexity is reduced, but the reliability deteriorates when synchronization fails in the second frequency band
Solution Approach 1:
The patent applies preliminary action by establishing synchronization in the first frequency band using the third frequency band as a backup before the second frequency band synchronization fails. The UE proactively switches the synchronization source from the second frequency band to the third frequency band when deterioration is detected, preventing complete synchronization loss rather than reacting after failure occurs.
Solution Approach 2:
The third frequency band serves as an intermediary synchronization source when the second frequency band becomes unreliable. Instead of directly relying on the failing second frequency band or attempting to re-establish synchronization from scratch, the UE uses the third frequency band as a mediator to maintain synchronization in the first frequency band, ensuring continuous communication quality.
2Adaptability or versatility
If the UE relies on synchronization signals in new carrier types (NCTs), then the adaptability to new carrier technologies is improved, but the reliability deteriorates due to limited synchronization signals
Solution Approach 1:
The patent applies universality by enabling the first frequency band to utilize synchronization results from multiple different frequency bands (both second and third frequency bands). This multi-functionality allows the system to adapt to different carrier types including NCTs while maintaining reliable synchronization through alternative sources when primary sources are insufficient.
Solution Approach 2:
The patent applies parameter changes by dynamically switching the synchronization source between different frequency bands based on synchronization quality parameters. When the second frequency band (NCT) shows deterioration in synchronization quality, the system changes the synchronization source parameter to use the third frequency band, thereby maintaining reliability while supporting new carrier technologies.
Data Source
AI summary
Provided is a terminal device including: a communication control unit configured to control a radio communication function so as to establish synchronization in a second frequency band by a synchronization signal transmitted in the second frequency band synchronized with a first frequency band, and to establish synchronization in the first frequency band by utilizing a synchronization result in the second frequency band. The first frequency band is synchronized with a third frequency band. The communication control unit controls the radio communication function so as to establish synchronization in the third frequency band by a synchronization signal transmitted in the third frequency band, and to establish synchronization in the first frequency band by utilizing a synchronization result in the third frequency band, before the radio communication function becomes unable to establish synchronization in the second frequency band by the synchronization signal.