CFRA Resource Handling During Failed Cell Switch Recovery
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Solution Overview
Problem
Existing technologies face challenges in handling pre-provisioned contention-free random access (CFRA) resources during Layer 1 or Layer 2 triggered mobility (LTM) cell switch failures, leading to potential resource conflicts and inefficiencies in handover procedures.
Innovation Solution
A method where a terminal device receives a configuration indicating CFRA resources for candidate cells and determines a second candidate cell for a cell switch upon failure of the first, discarding the CFRA resources for the second candidate cell to manage resource conflicts during LTM recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If CFRA resources are pre-provisioned for candidate cells in LTM procedure, then handover speed is improved, but resource conflicts occur when cell switch fails
Solution Approach 1:
The network device pre-provisions CFRA resources for multiple candidate cells before the actual handover execution. This preliminary preparation enables fast handover by having resources ready in advance, while the patent resolves the conflict by implementing a discard mechanism when a candidate cell becomes unavailable, thus maintaining both speed and reliability
Solution Approach 2:
When a cell switch to a pre-provisioned candidate cell fails, the terminal device discards the CFRA resources associated with that failed candidate cell. This discard action prevents resource conflicts by removing invalid resources from the set of available CFRA resources, allowing the terminal to retry handover with corrected resource allocation
2Adaptability or versatility
If terminal device maintains CFRA resources for multiple candidate cells, then handover flexibility is improved, but resource management complexity increases
Solution Approach 1:
The patent segments the CFRA resource management by associating resources with specific candidate cells through unique identifiers (first CFRA resource set for first candidate cell, second CFRA resource set for second candidate cell). This segmentation allows the terminal device to manage multiple candidate cells independently, maintaining flexibility while reducing complexity through structured organization
Solution Approach 2:
The patent implements dynamic resource management where the set of valid CFRA resources is updated based on handover status. When a cell switch fails, the corresponding CFRA resources are discarded from the active set. This dynamic adjustment maintains handover flexibility by allowing retries with different candidates while managing complexity through automated resource set updates
Data Source
AI summary
Example embodiments of the disclosure relate to methods, apparatuses, and a computer readable storage medium for handling contention free random access (CFRA) resources in a cell switch. In a method, a first apparatus receives, from a second apparatus, a configuration indicating CFRA resources for at least one candidate cell. The first apparatus receives, from the second apparatus, a cell switch command towards a first candidate cell. In accordance with a determination that a first cell switch to the first candidate cell fails, the first apparatus determines a second candidate cell for a second cell switch. The second candidate cell being one of the at least one candidate cell. Then the first apparatus discards CFRA resources for the second candidate cell.