Terminal Apparatus SCG Deactivation Notification via SRB1
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Solution Overview
Problem
In dual connectivity scenarios for 5G NR, terminal apparatuses face inefficiencies in notifying base stations of uplink data when a Secondary Cell Group (SCG) is deactivated, leading to power consumption issues and inefficient data communication.
Innovation Solution
A terminal apparatus and method that determine whether uplink data needs to be transmitted on a Data Radio Bearer (DRB) associated with the SCG and, if so, notify the base station via the SRB1 when the SCG is deactivated, ensuring efficient communication control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the terminal apparatus continuously monitors multiple cell groups to enable low-delay data communication with large capacity, then communication speed is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the monitoring state of cell groups changeable based on traffic conditions. The SCG can be dynamically activated or deactivated - when no uplink data is present, the SCG is deactivated to save power; when uplink data arrives, the SCG is activated to enable low-delay communication. This dynamic state transition resolves the contradiction between continuous monitoring for speed and intermittent monitoring for power savings.
2Reliability
If the terminal apparatus notifies the base station of all uplink data generated on SCG bearer when SCG is deactivated, then communication reliability is improved, but communication efficiency deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the notification behavior based on the specific state of the SCG. When the SCG is deactivated, the terminal selectively notifies the base station about uplink data - specifically notifying when data arrives that needs to be transmitted on the deactivated SCG bearer. This localized, state-dependent notification approach ensures reliability by not losing data information while improving efficiency by avoiding unnecessary notifications when the SCG is already deactivated and no data is present.
Data Source
AI summary
A terminal apparatus for communicating with a base station apparatus using an MCG and an SCG determines (a) whether uplink data has been generated that is to be transmitted on a DRB associated with an RLC entity of the SCG and (b) whether the SCG is deactivated, and in a case of determining that uplink data has been generated that is to be transmitted on the DRB associated with the RLC entity of the SCG and that the SCG is deactivated, the terminal apparatus notifies the base station apparatus via SRB1 that uplink data has been generated that is to be transmitted on the DRB associated with the RLC entity of the SCG.