UE Conditional LTM Mobility for Low-Latency Cell Switching
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Solution Overview
Problem
Existing 5G wireless communication systems face challenges in managing increased communication traffic and supporting efficient mobility, particularly in scenarios requiring ultra-reliability and low latency, such as vehicle-to-everything (V2X) and factory automation, due to network-based cell switching procedures that are vulnerable to radio link fluctuations.
Innovation Solution
The implementation of terminal-based Layer 1/Layer 2 Triggered Mobility (LTM) that allows user equipment (UE) to evaluate and execute mobility conditions autonomously, using conditional LTM configurations and synchronization-based reconfigurations to enhance mobility management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network-based cell switching procedures are used, then centralized control is maintained, but the system becomes vulnerable to radio link failures and experiences higher latency
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure the terminal with multiple candidate cells and their associated execution conditions before mobility is needed. The terminal stores this conditional LTM configuration in advance, so when radio link failures occur or rapid switching is needed, the terminal can immediately execute the pre-configured cell switch without waiting for network commands, thereby reducing latency while maintaining reliability through pre-vetted candidate cells.
Solution Approach 2:
The patent implements self-service by enabling the terminal to autonomously evaluate execution conditions and select appropriate candidate cells based on pre-configured parameters. The terminal independently monitors radio link quality, evaluates whether execution conditions are met, and autonomously executes cell switching without continuous network intervention. This self-service capability reduces dependency on network signaling during critical mobility events, lowering latency and improving reliability.
2Productivity
If terminal-based autonomous mobility decision-making is implemented, then latency is reduced and reliability is improved, but device complexity increases
Solution Approach 1:
The patent reduces terminal processing complexity through preliminary action by having the network pre-configure all necessary mobility parameters, candidate cell information, and execution condition thresholds before the terminal needs to make autonomous decisions. The terminal receives comprehensive LTM configuration including measurement identities, reporting configurations, and candidate cell details in advance, so it only needs to perform simple condition checking and execution rather than complex real-time analysis.
Solution Approach 2:
The patent applies segmentation by dividing mobility management into distinct functional layers: the network handles complex configuration, candidate cell selection, and condition parameter setting, while the terminal handles execution condition monitoring and cell switching execution. This segmentation allows the terminal to implement autonomous decision-making with reduced complexity by focusing only on evaluating pre-defined conditions and executing pre-selected options, rather than performing full mobility management functions.
Data Source
AI summary
Provided are a method and apparatus for configuring mobility in a wireless communication system. The method of a terminal may include receiving a conditional layer 1 (L1)/layer 2 (L2) triggered mobility (LTM) configuration, starting an evaluation of an execution condition for conditional LTM based on the received conditional LTM configuration, and stopping the evaluation of the execution condition, wherein the stopping of the evaluation may be performed based on reception of Reconfiguration WithSynch.