Lower Layer Mobility for Radio Link Failure Recovery
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Solution Overview
Problem
Current communication systems face challenges in efficiently managing radio link failures, particularly in wireless communication systems, where a failure in a source cell can lead to prolonged latency and overhead due to the need for complete L2 and L1 resets during cell switching, and existing methods for cell re-establishment can be time-consuming and inefficient.
Innovation Solution
The proposed solution involves an apparatus and method that allows for lower layer mobility (L1/L2) triggered mobility, where a communications device prepares and prioritizes candidate target cells for cell selection or radio resource control re-establishment upon detecting a radio link failure, enabling faster and more efficient handovers by synchronizing and acquiring timing advance information before receiving a cell switch command from the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complete L2 and L1 resets are performed during cell switching after radio link failure, then connection reliability is restored, but latency and overhead increase significantly
Solution Approach 1:
The patent applies preliminary action by preparing candidate target cells in advance through lower layer mobility procedures (L1/L2) before radio link failure occurs. The apparatus receives configuration information for candidate cells and performs synchronization and timing advance acquisition beforehand, so that when failure occurs, the device can quickly re-establish connection without complete L2/L1 resets, thus reducing latency while maintaining reliability
Solution Approach 2:
The patent segments the cell re-establishment process into two parts: (1) preliminary lower layer mobility preparation (L1/L2) that can be done in advance, and (2) higher layer recovery procedures. This segmentation allows the time-critical synchronization and timing advance functions to be completed beforehand, separating them from the slower higher layer protocols, thereby reducing overall latency while ensuring reliable reconnection
2Reliability
If traditional cell re-establishment procedures are used after radio link failure, then connection is restored, but the process is time-consuming and inefficient
Solution Approach 1:
The patent performs synchronization and timing advance acquisition with candidate target cells before radio link failure occurs. By preparing these critical parameters in advance through lower layer mobility procedures, the apparatus can quickly re-establish connection upon failure without waiting for traditional time-consuming procedures, thus improving re-establishment efficiency while ensuring reliable connection restoration
Solution Approach 2:
The apparatus autonomously manages the candidate cell preparation process by independently performing synchronization and timing advance acquisition with potential target cells. This self-service approach allows the device to proactively prepare recovery options without continuous network intervention, improving efficiency by eliminating redundant signaling and reducing dependency on slow traditional re-establishment procedures
Data Source
AI summary
An apparatus comprising: means for receiving a message from a network node on a source cell indicating one or more lower layer mobility candidate cells; means for determining a failure with the source cell; and means for, after the determining of the failure, attempting at least one of cell selection or radio resource control re-establishment on one or more of the one or more candidate cells.