Sidelink HARQ Feedback Channel Configuration in 5G NR
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Solution Overview
Problem
Current V2X communication systems, particularly in 5G NR networks, face challenges in efficiently configuring and managing sidelink HARQ feedback channels, which affects the reliability and spectrum efficiency of unicast and groupcast communications.
Innovation Solution
A method where user equipment determines a PSFCH resource for sidelink HARQ feedback by receiving sidelink configuration information, including a period and feedback interval, to optimize the timing and resource allocation for HARQ feedback channels, ensuring efficient communication in various scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sidelink HARQ feedback channels are configured with fixed resource allocation, then device complexity is reduced, but spectrum efficiency deteriorates due to insufficient resource optimization
Solution Approach 1:
The patent implements dynamic PSFCH resource allocation where the feedback channel resources are adaptively selected based on the timing of received PSSCH transmissions. The UE determines PSFCH transmission slots dynamically using formulas that incorporate slot offsets and periodicity parameters, allowing the system to optimize spectrum usage according to actual communication conditions rather than using fixed predetermined resources.
2Reliability
If PSFCH resources are allocated in every slot, then feedback reliability is improved, but resource waste increases due to insufficient feedback traffic
Solution Approach 1:
The patent implements periodic PSFCH resource allocation where feedback channels are configured with a period N, meaning PSFCH resources are allocated only in every Nth slot rather than every slot. This periodic allocation reduces resource waste when feedback traffic is not continuous, while still maintaining reliability by ensuring feedback opportunities occur regularly at defined intervals throughout the communication process.
3Reliability
If feedback interval is reduced, then communication reliability is improved through faster feedback, but time overhead increases due to more frequent feedback transmissions
Solution Approach 1:
The patent enables dynamic adjustment of the feedback interval parameter K, which controls the timing offset between PSSCH reception and PSFCH transmission. By optimizing this parameter based on channel conditions and traffic patterns, the system can achieve faster feedback when needed (improving reliability) while avoiding excessive feedback frequency that would increase time overhead. The parameter can be configured flexibly to match different service requirements.
4Adaptability or versatility
If multiple PSFCH resources are configured for different scenarios, then adaptability is improved, but device complexity increases due to resource management overhead
Solution Approach 1:
The patent implements scenario-specific PSFCH resource configuration where different resource pools, periodicities, and timing parameters are configured for different communication scenarios (e.g., V2X, D2D, broadcast, groupcast, unicast). Each scenario can have optimized local parameters tailored to its specific requirements, while the overall resource management remains structured and manageable through scenario-based configuration rather than requiring complex global resource coordination.
Data Source
AI summary
The present disclosure provides a method performed by user equipment and user equipment. The method includes: receiving sidelink configuration information; receiving sidelink control information (SCI) transmitted by other user equipment and a corresponding physical sidelink shared channel (PSSCH); determining a transmission slot S of a physical sidelink feedback channel (PSFCH) corresponding to the PSSCH; and determining N sidelink slots associated with the slot S, where N is a positive integer.