Terminal Apparatus SCG Activation via TAT Expiration Detection
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Solution Overview
Problem
In dual connectivity technology for NR, terminal apparatuses need to continuously monitor multiple cell groups to achieve low latency during large data communication, leading to high power consumption. Additionally, existing solutions for cell group deactivation may cause unnecessary signaling.
Innovation Solution
A terminal apparatus that includes a processing unit for communicating using both Main Cell Group (MCG) and Secondary Cell Group (SCG), where the MCG includes at least a Primary Cell (PCell) and the SCG includes at least a Primary Secondary Cell (PSCell). The MAC entity determines if a Timer Allocation and Tag (TAT) associated with the PSCell has expired, and upon expiration, provides a notification to the RRC entity indicating the need for a random access procedure to activate the SCG.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the terminal apparatus continuously monitors multiple cell groups to achieve low latency during large data communication, then communication latency is reduced, but power consumption increases
Solution Approach 1:
The patent implements periodic monitoring of cell groups instead of continuous monitoring. The terminal apparatus monitors cell groups at specific intervals determined by monitoring periods configured in the second cell group, reducing power consumption while maintaining acceptable communication performance. This periodic action allows the terminal to balance between latency requirements and power consumption.
2Use of energy by moving object
If cell group deactivation technology is implemented to reduce power consumption, then power consumption is reduced, but unnecessary signaling may occur
Solution Approach 1:
The patent applies preliminary action by configuring monitoring periods in advance for cell groups before deactivation occurs. The terminal apparatus stores monitoring period information for each cell group, allowing it to resume monitoring at the correct intervals without needing to perform complex reconfiguration or generate unnecessary signaling when activation is needed again.
3Use of energy by moving object
If the terminal apparatus less frequently monitors some cell groups to reduce power consumption, then power consumption is reduced, but communication reliability may deteriorate
Solution Approach 1:
The patent applies local quality by differentiating monitoring frequencies for different cell groups based on their importance and data transmission characteristics. The terminal apparatus monitors the first cell group more frequently and the second cell group less frequently, with monitoring periods configured according to each cell group's specific requirements. This localized approach maintains communication reliability for critical cell groups while reducing overall power consumption.
Data Source
AI summary
A MAC entity of a terminal apparatus determines whether a TAT associated with a TAG including a PSCell of an SCG has expired, and provides a notification to an RRC entity of the terminal apparatus, the notification indicating that a random access procedure is needed for activation of the SCG based on the determination that the TAT associated with the TAG including the PSCell has expired.