Sidelink RLF Detection Using HARQ Feedback in Carrier Aggregation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a lack of effective means for detecting radio link failure (RLF) in sidelink carrier aggregation scenarios, particularly in SL communication environments such as V2X and intelligent driving.
Innovation Solution
A method and apparatus for detecting SL RLF by determining HARQ feedback on a physical sidelink feedback channel (PSFCH) and maintaining variables to count consecutive discontinuous transmissions (DTXs) across multiple carriers, using thresholds configured by a network device to trigger RLF detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carrier aggregation technology is used in SL communication, then communication capacity and reliability are improved, but the ability to detect radio link failure deteriorates due to lack of effective detection means
Solution Approach 1:
The patent segments the RLF detection mechanism by introducing separate counters (e.g., sl-Counter per carrier and sl-TotalCounter across all carriers) to track DTX events on individual carriers and aggregate levels. This segmentation allows the system to monitor link quality on each carrier independently while maintaining overall connection status, enabling effective RLF detection in carrier aggregation scenarios where multiple carriers are involved.
2Productivity
If multiple carriers are used for SL communication, then data transmission capacity is improved, but complexity of monitoring and detecting link failure increases
Solution Approach 1:
The patent extracts the detection logic into a standardized framework using configurable parameters (sl-maxNumConsecutiveDTX, sl-TotalMaxNumConsecutiveDTX) that define failure thresholds. By separating the detection mechanism into independent counters and configurable thresholds, the system can monitor multiple carriers without proportionally increasing complexity, as the same detection logic applies regardless of the number of carriers.
Solution Approach 2:
The patent employs parameter changes by allowing the network to configure different threshold values (sl-maxNumConsecutiveDTX per carrier, sl-TotalMaxNumConsecutiveDTX aggregate) to adapt to different carrier aggregation scenarios. This enables flexible adjustment of detection sensitivity based on the number of carriers and service requirements, managing complexity through configurable parameters rather than hard-coded logic.
3Ease of operation
If conventional RLF detection methods are applied to SL carrier aggregation, then implementation simplicity is maintained, but detection accuracy deteriorates due to lack of carrier-specific monitoring
Solution Approach 1:
The patent adds another dimension to RLF detection by implementing both per-carrier monitoring (sl-Counter for each carrier) and aggregate monitoring (sl-TotalCounter across all carriers). This two-dimensional approach allows the system to detect failures at the carrier level while also monitoring overall connection health, providing both granular and holistic detection accuracy without significantly increasing implementation complexity.
Data Source
Figure 1~3
Figure 4~8
Figure 9
AI summary
Disclosed in the embodiments of the present disclosure are a sidelink (SL) radio link failure (RLF) detection method and apparatus, which can be applied to systems such as the Internet of Vehicles, V2X and V2V. The method comprises: a terminal device determining a receiving situation of hybrid automatic repeat request (HARQ) feedback on a physical sidelink feedback channel (PSFCH); and according to the receiving situation of the HARQ feedback on the PSFCH, determining whether a unicast connection triggers an SL RLF, wherein the unicast connection is a unicast connection established by a sending terminal and a receiving terminal on an SL, the sending terminal and the receiving terminal perform SL communication by means of a plurality of carriers, which are associated with the unicast connection. By means of implementing the embodiments of the present disclosure, the problem of how to effectively detect an RLF in an SL carrier aggregation scenario can be solved, such that an RLF mechanism can be supported in a carrier aggregation scenario during SL communication.