Base Station Resynchronization Triggering After Uplink SCC Activation
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Solution Overview
Problem
Existing resynchronization methods in uplink carrier aggregation (CA) cause a delay in triggering resynchronization, leading to reduced uplink throughput due to the need for multiple timing advances (MTAs) and varying terminal demodulation performance.
Innovation Solution
A method and base station design that triggers resynchronization immediately after an uplink secondary carrier cell (SCC) activation, with a feedback mechanism to re-trigger if no response is received within a preset time, ensuring timely resynchronization and maintaining high demodulation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resynchronization is triggered 30 milliseconds after SCC activation, then terminal demodulation accuracy is maintained, but uplink throughput is reduced due to delay
Solution Approach 1:
The base station triggers resynchronization immediately after SCC activation rather than waiting 30 milliseconds. This preliminary action reduces the delay period and allows uplink data transmission to start sooner, thereby improving uplink throughput while still maintaining demodulation accuracy through the immediate timing advance adjustment.
Solution Approach 2:
The base station sends a resynchronization trigger and waits for feedback from the terminal. If no feedback is received within a preset time range, the base station re-triggers resynchronization. This feedback mechanism ensures that demodulation accuracy is maintained even when terminals have different processing capabilities, while minimizing unnecessary delays.
2Productivity
If resynchronization is triggered immediately after SCC activation, then uplink throughput is improved, but terminal demodulation accuracy may deteriorate
Solution Approach 1:
The base station triggers resynchronization immediately (excessive action regarding timing) to maximize uplink throughput, and then uses a feedback verification mechanism to ensure demodulation accuracy is actually achieved. This partial verification approach allows the system to prioritize speed while still maintaining quality through selective confirmation.
Solution Approach 2:
The system implements a feedback mechanism where the base station monitors whether terminals correctly receive and respond to the resynchronization trigger. If feedback indicates successful synchronization, the immediate triggering approach is validated. If not, the system can adjust timing or re-trigger, thus ensuring demodulation accuracy is maintained despite the aggressive immediate triggering strategy.
3Adaptability or versatility
If resynchronization is re-triggered when no feedback is received, then compatibility with diverse terminals is improved, but system complexity increases
Solution Approach 1:
The terminal autonomously determines whether it has successfully synchronized and sends feedback accordingly. The base station simply monitors for the presence or absence of feedback within the preset time range and automatically re-triggers if needed. This self-service approach allows diverse terminals to adapt to the system without requiring complex base station intelligence, maintaining low system complexity while improving compatibility.
Solution Approach 2:
The system changes the resynchronization triggering parameter from a fixed 30-millisecond delay to a dynamic approach where the trigger time is immediately after SCC activation, and a re-trigger may occur based on feedback presence. This parameter change from static to adaptive timing improves compatibility with diverse terminal processing speeds while the simple feedback-based decision logic keeps the control mechanism relatively simple.
Data Source
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AI summary
This application provides a resynchronization trigger method and a base station. The method includes: triggering, by a base station, resynchronization immediately after an uplink secondary carrier cell SCC is activated, where a triggering moment of the resynchronization is T1; and detecting, by the base station, whether a resynchronization feedback signal is received within a preset time range, and if not, triggering resynchronization, where a start moment of the preset time range is T1, an end moment of the preset time range is T2, and a difference between T2 and T1 is less than or equal to 30 milliseconds. The base station triggers resynchronization immediately after the uplink secondary carrier cell SCC is activated. Therefore, a delay time for triggering resynchronization can be reduced, thereby increasing an uplink throughput. In addition, if no resynchronization feedback signal is received within the preset time range, the base station re-triggers resynchronization. Therefore, different terminals can be supported, and this ensures that the terminals can correctly demodulate a physical downlink control channel command.