Radio Link Monitoring Configuration for Inter-Cell Mobility
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Solution Overview
Problem
In wireless communication systems, the current Radio Link Monitoring (RLM) mechanism can lead to premature triggering of Radio Link Failure (RLF) when User Equipment (UE) uses radio resources of another cell, affecting performance and service continuity.
Innovation Solution
A method involving configuring Reference Signal (RS) resource groups with specific Physical Cell Identifiers (PCI) and using signaling at different protocol layers to manage radio link monitoring, avoiding unnecessary RLF triggers by focusing monitoring on target RS resource groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current Radio Link Monitoring (RLM) mechanism is used when UE uses radio resources of another cell, then the monitoring can be performed using existing procedures, but it leads to premature triggering of Radio Link Failure (RLF)
Solution Approach 1:
The patent applies local quality by differentiating the monitoring behavior based on the source of radio resources. When the UE uses radio resources from another cell (identified by different PCI), the UE applies a different RLM approach (using Qout,Qin values from the other cell) compared to when using serving cell resources. This localized adaptation prevents premature RLF triggering while maintaining reliability for inter-cell L1/L2 mobility scenarios.
2Adaptability or versatility
If the UE uses TRP of another cell for data transmission within serving cell coverage, then inter-cell L1/L2 mobility is enabled, but the current RLM mechanism causes untimely RLF triggering
Solution Approach 1:
The patent implements local quality by making the RLM behavior adaptive to the radio resource source. The UE identifies whether it is using serving cell or other cell TRP based on PCI comparison, and applies corresponding Qout,Qin thresholds. This enables inter-cell L1/L2 mobility while ensuring RLF triggering accuracy by using appropriate monitoring parameters for each scenario.
Solution Approach 2:
The patent applies dynamics by making the RLM thresholds dynamic rather than static. The UE dynamically selects between serving cell Qout,Qin and other cell Qout,Qin based on the current active TRP configuration. This dynamic adaptation allows the system to maintain reliable operation across different mobility scenarios without premature RLF.
3Adaptability or versatility
If RRC signaling is used to configure radio parameters of another cell, then inter-cell mobility configuration is achieved, but the RLM mechanism cannot distinguish between serving cell and other cell resources
Solution Approach 1:
The patent resolves the complexity issue by applying local quality - the UE maintains separate Qout,Qin values for serving cell and other cell, and selectively applies the appropriate set based on the active TRP. The RRC configuration includes both serving cell and other cell parameters, but the RLM mechanism locally adapts by using only the relevant set, avoiding the need for a completely new complex monitoring framework.
Data Source
AI summary
A communication node receives a first signaling, the first signaling used for configuring a first RS resource group, with all RS resources in the first RS resource group being associated with a first PCI; and receives a second signaling, the second signaling used for determining a first target RS resource group, which belongs to the first RS resource group; and performs a first action set as a response to the action of receiving the second signaling, the first action set including resetting a count of first-type indication(s); the first RS resource group comprises at least one RS resource; the first signaling is an RRC layer signaling; the second signaling is a signaling at protocol layer below the RRC layer; the first target RS resource group is used for radio link monitoring; the first-type indication is related to a link failure.