Radio Link Failure Detection for eMBB and URLLC Scenarios
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Solution Overview
Problem
Conventional radio link monitoring (RLM) and radio link failure (RLF) detection techniques do not account for the varying quality of service requirements across different usage scenarios in wireless communication systems, such as enhanced Mobile Broadband (eMBB) and Ultra Reliable and Low Latency Communications (URLLC), leading to suboptimal performance.
Innovation Solution
The proposed solution involves tailoring RLM and RLF procedures at user equipment (UE) based on specific usage scenarios, adjusting parameters like out-of-sync detection thresholds, timer durations, and radio link quality evaluation methods to match the quality of service requirements of each scenario, utilizing control resource sets (CORESET groups) to differentiate between eMBB, URLLC, and other traffic types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional RLM and RLF detection techniques are used, then the system maintains simplicity and uniformity, but the quality of service requirements for different usage scenarios (eMBB, URLLC, mMTC) cannot be met
Solution Approach 1:
The patent segments the RLM and RLF detection procedures by introducing separate monitoring configurations for different usage scenarios. Specifically, it divides the monitoring into eMBB-based monitoring (using PDCCH on eMBB carrier) and URLLC-based monitoring (using PDCCH on URLLC carrier), allowing each scenario to have optimized parameters independent of the other
Solution Approach 2:
The patent implements dynamic adaptation by allowing the UE to switch between different RLM/RLF detection modes based on the active usage scenario. The system dynamically adjusts monitoring parameters such as reference signals, carriers, and evaluation thresholds according to whether eMBB or URLLC traffic is dominant, rather than using fixed conventional parameters
2Reliability
If RLM parameters are optimized for URLLC with stringent latency and reliability requirements, then URLLC performance improves, but eMBB performance may deteriorate due to relaxed requirements
Solution Approach 1:
The patent applies local quality by configuring different RLM parameter sets tailored to specific usage scenarios. For URLLC, it uses more stringent parameters (lower thresholds, more frequent monitoring) localized to URLLC carriers, while eMBB carriers use relaxed parameters appropriate for their requirements, rather than applying a single uniform parameter set system-wide
3Device complexity
If a single RLF detection threshold is used for all traffic types, then the detection procedure remains simple, but failure detection accuracy decreases for specific scenarios
Solution Approach 1:
The patent changes the evaluation parameters based on the usage scenario. It introduces scenario-specific Qout and Qin thresholds for radio link quality evaluation, where URLLC uses stricter thresholds to detect link degradation earlier, while eMBB uses more relaxed thresholds. The UE dynamically adjusts these parameters based on the active traffic type
Data Source
AI summary
The disclosed subject matter provides techniques for detecting and correcting radio link failures based on the different usage scenarios. In one embodiment, a device is provided that comprises a processor, and a memory that stores executable instructions that, when executed by the processor, facilitate performance of various operations. These operations can comprise monitoring a quality of a radio link established between the device and a network device of a wireless communication network based on downlink transmissions received from the network device. These operations can further comprise determining whether the quality indicates the device and the network device are out-of-sync based on the quality being below a defined quality level, wherein the defined quality level varies based on a usage scenario associated with usage of the radio link by the device.