Terminal Device Timing Advance Group Timeout Handling
Solution Overview
Problem
In communication systems, particularly in scenarios with multiple timing advance groups (TAGs) per serving cell, the timeout of timers associated with primary TAGs can lead to service discontinuity due to improper resource management by user equipment (UE).
Innovation Solution
A method for communication in terminal devices that involves determining the type of a TAG based on a specific mode and performing corresponding behaviors based on the TAG type and associated timers. This approach allows for more flexible resource management and reduces service disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE follows the timeout operation of timers associated with primary TAGs, then the timer management is simplified, but service discontinuity occurs
Solution Approach 1:
The patent segments the TAG timeout handling into two distinct cases: primary TAG timeout and secondary TAG timeout. For primary TAG timeout, the UE performs random access procedure to realign timing. For secondary TAG timeout, the UE applies timing advance from the primary TAG. This segmentation resolves the contradiction by providing differentiated handling that maintains service continuity while keeping timer management manageable.
Solution Approach 2:
The patent establishes preliminary associations between serving cells and multiple TAGs before timeout events occur. When a primary TAG timeout happens, the UE has pre-configured secondary TAGs with valid timing advance values ready to maintain service. This preliminary preparation prevents service discontinuity by ensuring backup timing references are available before needed.
2Reliability
If each serving cell is associated with multiple TAGs, then service continuity is improved, but the resource management complexity increases
Solution Approach 1:
The patent applies different timeout handling behaviors to different TAG types associated with the same serving cell. Primary TAGs trigger random access procedures, while secondary TAGs utilize timing advance from primary TAGs. This local differentiation in resource management maintains service continuity through diverse strategies while managing complexity through clear, context-specific rules for each TAG type.
3Productivity
If the UE releases resources upon primary TAG timeout, then resource efficiency is improved, but service discontinuity occurs
Solution Approach 1:
The patent configures multiple TAGs in advance, with secondary TAGs serving as backups for primary TAGs. When primary TAG times out, the UE can immediately apply timing advance from the secondary TAG without releasing resources or performing random access, thus maintaining service continuity while preserving resource allocation efficiency.
Data Source
AI summary
Provided is a method for communication. The method is applicable to a terminal device, and the method includes: determining a type of a timing advance group (TAG) based on a first mode; and performing a first behavior based on the type of the TAG and a timer associated with the TAG.