Mobility Failure Reporting With L1/L2 and L3 Trigger Indication
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling mobility failures between network nodes due to the lack of differentiation between Layer 1/Layer 2 (L1/L2) and Layer 3 (L3) mobility procedures, leading to misclassification of failure causes and inefficient resource utilization.
Innovation Solution
Enhanced RLF reports that include an indication of whether the last mobility procedure was triggered by L1/L2 or L3 operations, allowing network nodes to optimize mobility configurations based on the failure type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If L1/L2 based inter-cell mobility is implemented to reduce mobility latency, then mobility speed is improved, but the ability to differentiate failure causes deteriorates due to lack of indication mechanisms
Solution Approach 1:
The patent segments the mobility indication mechanism by introducing distinct indication fields for L1/L2 triggered mobility versus L3 triggered mobility in RLF reports. This segmentation allows the system to maintain fast L1/L2 mobility while preserving the ability to differentiate failure causes through structured reporting.
Solution Approach 2:
The patent introduces an intermediary indication mechanism (indication field in RLF report) that mediates between the fast L1/L2 mobility procedure and the failure analysis requirement. This intermediary preserves information about the mobility trigger type without slowing down the mobility process itself.
2Productivity
If mobility procedures are optimized for speed using L1/L2 operations, then productivity is improved, but measurement precision of failure causes deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the wireless device provides information about the mobility trigger type (L1/L2 or L3) in the RLF report to the network node. This feedback enables precise measurement and analysis of failure causes while maintaining optimized L1/L2 mobility procedures for high productivity.
Solution Approach 2:
The patent applies preliminary action by having the wireless device prepare and include the mobility trigger type indication in advance within the RLF report structure, enabling immediate and precise failure cause identification without post-processing delays.
3Reliability
If L1/L2 mobility indications are added to RLF reports, then reliability of failure analysis is improved, but device complexity increases
Solution Approach 1:
The patent changes the parameter structure of the RLF report by adding a specific indication field for mobility trigger type. This parameter change improves failure analysis reliability while maintaining manageable device complexity through standardized field additions rather than complex structural changes.
Data Source
AI summary
A method, performed by a wireless device (130). The method is for handling a failure in a mobility procedure by the wireless device (130) from a first network node (111) to a second network node (112). The wireless device (130) operates in a wireless communications network (100). The wireless device (130) sends (305), to a third network node (113) serving the wireless device (130) in the wireless communications network (100), one or more indications indicating the failed mobility procedure. The one or more indications comprise at least a first indication. The first indication indicates whether a previous indication that indicated to the wireless device (130) to perform a last completed mobility procedure was received by the wireless device (130) via a Layer 1/Layer 2 operation or via a Layer 3 operation.