5G SCG Random Access Control Using Timer-Based Activation
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Solution Overview
Problem
In the context of 5G network deployments, there is a challenge in managing the random access procedure for a Secondary Cell Group (SCG) after it has been deactivated, particularly in scenarios where the Timing Advance (TA) and Transmission Configuration Indication (TCI) states are either valid or invalid, affecting the UE's ability to receive scheduling information on the PSCell.
Innovation Solution
The proposed solution involves using timers to determine whether to initiate a random access procedure to the SCG, with a first timer for activation and a second timer for assessing procedure success, along with Beam Failure Detection and Recovery mechanisms to ensure rapid recovery from anomalies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the SCG is deactivated to save power and rapidly establish the Secondary Cell Group, then power consumption is reduced and SCG establishment speed is improved, but the random access procedure implementation becomes unclear and recovery from anomalies is delayed
Solution Approach 1:
The patent applies preliminary action by configuring timers (first timer and second timer) in advance before the SCG activation occurs. These timers are pre-configured to automatically trigger random access procedures at appropriate intervals, eliminating the need for complex real-time decision-making and ensuring rapid recovery without additional power consumption overhead.
2Speed
If the random access procedure is initiated immediately upon receiving the SCG activation command, then the SCG activation speed is improved, but the system complexity increases due to unclear procedure implementation
Solution Approach 1:
The patent applies dynamics by making the random access procedure initiation conditional rather than immediate. The system dynamically adjusts the timing of random access based on timer expiration events, allowing flexible control over when the procedure starts. This dynamic approach simplifies implementation by using timer-based triggers instead of complex real-time condition evaluation.
3Speed
If the UE monitors scheduling information continuously to detect anomalies quickly, then the anomaly detection speed is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by using timers to trigger random access procedures at regular intervals rather than continuously monitoring. The first timer and second timer create periodic checkpoints where the UE assesses whether random access should be initiated, reducing power consumption while maintaining effective anomaly detection capability through these periodic assessments.
Data Source
AI summary
Embodiments of the present application provide a method and apparatus for controlling random access, and a terminal device, the method including: a terminal device receives a first command, the first command being used to activate an SCG; and the terminal device determines, on the basis of a first timer, whether to initiate a random access procedure to the SCG and/or determines, on the basis of a second timer, whether the random access procedure initiated to the SCG is successful.