L1/L2 Inter-Cell Mobility Failure Handling for Fast Serving Cell Change
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Solution Overview
Problem
Existing wireless communication systems lack adequate signaling and procedures for handling radio-related failures during Layer 1/Layer 2 (L1/L2) based inter-cell mobility, leading to increased latency, overhead, and interruption time.
Innovation Solution
Implementing methods and apparatuses for failure handling during L1/L2 based inter-cell mobility, including configurations for wireless devices and network nodes to manage radio-related failures through L1/L2 based inter-cell mobility serving cell change procedures, with indications and configurations for executing such changes upon detection of failures like beam failure, handover failure, or radio link failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If L3 measurements and RRC signaling triggered Reconfiguration with Synchronization are used for serving cell change, then reliability of cell change is ensured, but latency and interruption time increase
Solution Approach 1:
The patent segments the mobility procedure into L1/L2-based beam switching operations that can execute quickly, separating the critical time-sensitive cell change function from the slower L3 RRC signaling. This allows the essential mobility function to operate at lower protocol layers with reduced latency while maintaining overall reliability through coordinated multi-layer operation.
Solution Approach 2:
The patent implements preliminary configuration of candidate target cells and beam failure recovery resources before failures occur. By pre-configuring multiple candidate cells and their associated parameters, the system eliminates the need for time-consuming failure detection and configuration phases, enabling immediate execution of cell change procedures when needed.
2Reliability
If complete L2 (and L1) resets are performed during serving cell change, then reliability is improved, but overhead and interruption time increase
Solution Approach 1:
The patent extracts the essential cell change function from the complete L1/L2 reset procedure, isolating only the necessary reconfiguration operations. By removing unnecessary reset steps and retaining only the critical cell change mechanics, the system achieves reliability improvement without the overhead burden of comprehensive layer resets.
Solution Approach 2:
The patent implements dynamic, selective reconfiguration of specific L1/L2 parameters based on actual mobility needs rather than uniform complete resets. This allows the system to adaptively apply only the necessary configuration changes for each specific cell change scenario, reducing overhead while maintaining reliability through targeted parameter updates.
3Loss of time
If L1/L2 based inter-cell mobility is implemented, then latency and interruption time are reduced, but failure handling procedures are insufficient
Solution Approach 1:
The patent prepares backup failure handling mechanisms in advance by configuring multiple candidate target cells and pre-establishing beam failure recovery procedures. This cushioning approach ensures that if the primary L1/L2 mobility path encounters failures, pre-configured alternative paths and recovery procedures are immediately available, maintaining reliability without sacrificing the low-latency benefits of L1/L2-based mobility.
Data Source
AI summary
A method, system and apparatus are disclosed. A wireless device configured with an inter-cell mobility configuration for handling radio related failures is provided. The wireless device attempts to execute the first inter-cell mobility change procedure with a first target network node of a first inter-cell mobility candidate target cell associated with the inter-cell mobility configuration. The wireless device determines a radio related failure associated with the first target network node, the first inter-cell mobility candidate target cell, and/or the inter-cell mobility change procedure. The wireless device performs at least one wireless device action based on the inter-cell mobility configuration and the determined radio related failure.