Radio Link Failure Reporting with Resource Bitmap
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Solution Overview
Problem
User equipment (UE) devices face challenges in determining which resources of the Radio Resource Management (RRM) configuration belong to the Radio Link Monitoring (RLM) configuration, complicating radio link failure (RLF) reporting to the network.
Innovation Solution
The UE device transmits a radio link failure report that includes a bitmap or list of identifiers indicating the resources of the active RLM configuration, allowing the network to identify the RLM configuration even if it has discarded the UE's context.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE device independently performs RRM and RLM processes with independent resource indices, then the configuration flexibility is improved, but the difficulty of determining resource correspondence worsens
Solution Approach 1:
The patent introduces an intermediary mapping relationship between RRM resource indices and RLM resource indices. This mapping acts as a mediator that allows the UE to translate between the two independent resource indexing systems, thereby maintaining configuration flexibility while enabling resource correspondence determination through the mapping table stored in the UE device.
2Reliability
If the network discards UE context to improve security or resource management, then the network security and resource efficiency are improved, but the ability to identify RLM configuration without context worsens
Solution Approach 1:
The patent applies preliminary action by having the UE store and include RLM configuration information (such as resource indices or identification data) in the RLF report before the network discards the UE context. This ensures that the network can identify the RLM configuration used during the radio link failure even after the UE context has been discarded, maintaining both security and configuration traceability.
3Measurement precision
If the UE includes detailed RLM configuration information in the RLF report, then the network's ability to assess deployment is improved, but the report size and processing complexity worsen
Solution Approach 1:
The patent extracts only the essential RLM configuration identification information (such as resource indices or compact identifiers) from the full RLM configuration and includes only these extracted elements in the RLF report. This allows the network to accurately identify and assess the deployment configuration while keeping the report size and processing complexity manageable by including only the necessary identification data rather than complete configuration details.
Data Source
AI summary
When a user equipment (UE) encounters a radio link failure condition, the UE may transmit a radio link failure report to a network. The report may include information defining the radio link monitoring (RLM) resources of a current RLM configuration. The information may take the form of a resource bitmap or a list of resource identifiers/indices. The network may use the information (and radio resource management measurements) to determine whether the radio link failure occurred due to misconfiguration of RLM resources for the UE. In cases where the network does not provide RLM configuration, the UE may omit the bitmap (or list), or populate the bitmap with all zeros, or populate the bitmap (or list) according to a currently active Transmission Configuration Indication (TCI) state, which is indicated by downlink control information (DCI).