PSCell Change Handling for Deactivated SCG Random Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of managing configuration of a secondary cell group (SCG) in a deactivated state in user equipment (UE) configured with dual or multi-connectivity is not adequately addressed, leading to increased power consumption.
Innovation Solution
A method for UE to perform configuration management on an SCG in a deactivated state by receiving an RRC connection reconfiguration message, performing PSCell change operations based on the target SCG's state, and triggering appropriate actions such as starting or stopping timers, resuming or not resuming SCG transmission, and applying or not applying CSI reporting configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the SCG is deactivated to reduce power consumption, then power consumption is reduced, but configuration management becomes problematic
Solution Approach 1:
The patent implements dynamic state management for the SCG, allowing it to switch between activated and deactivated states based on communication requirements. The PSCell can be dynamically changed while maintaining proper timer management (T304) and random access procedures, enabling the system to adapt between power-saving mode and active configuration management as needed.
2Use of energy by moving object
If the SCG is deactivated, then power consumption is reduced, but communication efficiency is compromised
Solution Approach 1:
The patent performs preliminary configuration management actions while the SCG is still in the deactivated state. The network can pre-configure the target PSCell and SCG parameters, and the UE can prepare for rapid activation by having the configuration already available, thus maintaining communication efficiency while preserving power savings.
3Reliability
If the timer T304 is started for deactivated SCG, then random access procedure is properly managed, but power consumption increases
Solution Approach 1:
The patent applies timer T304 selectively - only when the target SCG or PSCell is in an activated state or when a random access procedure is actually initiated. When the SCG remains deactivated, the timer is not started, thus avoiding unnecessary power consumption while maintaining reliable random access management when needed.
Data Source
AI summary
Provided in the present invention are a method performed by user equipment, and user equipment. A method performed by user equipment, in which user equipment (UE) configured with dual connectivity or multi-connectivity performs configuration management on a secondary cell group (SCG) in a deactivated state during communication with a master cell group (MCG) and the SCG, includes the following steps: receiving, by the UE, an RRC connection reconfiguration message transmitted by a base station to the UE, the RRC connection reconfiguration message including a dedicated cell configuration for an SCG and a synchronization indication, wherein the SCG corresponding to the dedicated cell configuration is a target SCG, a primary serving cell (PSCell) thereof is a target PSCell, and an SCG/PSCell serving the UE before the reconfiguration message is received is a source SCG/source PSCell; and performing, by the UE, different PSCell change operations according to different states of the target SCG or the target PSCell.