Radio Link Failure Declaration in Multiple Active Bandwidth Parts
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Solution Overview
Problem
In wireless communication systems, when multiple bandwidth parts (BWP) are activated, declaring radio link failure (RLF) can lead to unnecessary service interruptions, as the current methods do not efficiently differentiate between active and inactive BWPs.
Innovation Solution
A method where a wireless device activates multiple BWPs, performs radio link monitoring (RLM) on each, and decides whether to declare RLF based on the radio link state of all activated BWPs, avoiding unnecessary interruptions by only declaring RLF when no available active BWP exists.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless device declares radio link failure when radio link problem is detected from an activated BWP, then the device can initiate recovery procedure, but unnecessary service interruption occurs when other activated BWPs are still available
Solution Approach 1:
The patent applies local quality by evaluating the radio link status individually for each activated BWP rather than making a global declaration based on a single BWP. The wireless device determines RLF only when all activated BWPs experience radio link problems, allowing selective continuation of service on healthy BWPs while initiating recovery only when necessary.
Solution Approach 2:
The patent implements partial action by not declaring RLF immediately upon detecting problems in one BWP when other BWPs remain functional. The device performs partial evaluation across multiple BWPs and delays or avoids RLF declaration as long as at least one BWP maintains acceptable radio link quality, thereby reducing unnecessary service interruptions.
2Adaptability or versatility
If multiple BWPs are activated for flexible broadband operation, then the system can support different bandwidth capabilities, but the complexity of monitoring and declaring RLF increases
Solution Approach 1:
The patent applies universality by creating a unified RLF determination mechanism that works across multiple activated BWPs. The wireless device uses a common evaluation framework and decision-making process that can handle any number of activated BWPs, making the system adaptable to different bandwidth configurations without requiring separate monitoring procedures for each BWP.
Solution Approach 2:
The patent merges the RLF evaluation process across multiple BWPs into a single unified determination. Instead of treating each BWP independently with separate RLF declarations, the device combines the status of all activated BWPs to make a collective RLF decision, simplifying the overall monitoring complexity while maintaining adaptability to multiple bandwidth configurations.
Data Source
AI summary
A method and an apparatus for declaring radio link failure in multiple active bandwidth parts in a wireless communication system are provided. A wireless device activates a first bandwidth part (BWP) and a second BWP for a serving cell. A wireless device performs a radio link monitoring (RLM) on the first BWP and the second BWP. A wireless device detects a radio link problem on the first BWP. A wireless device decides whether to declare a radio link failure (RLF) for the serving cell based on radio link state of both the first BWP and the second BWP.