Sidelink Carrier Selection for 5G NR V2X
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Solution Overview
Problem
Current wireless communication networks, particularly 5G NR, lack an efficient carrier reselection mechanism for sidelink communications with multiple carriers, leading to suboptimal performance in vehicle-to-everything (V2X) scenarios due to increased capabilities and use cases compared to LTE.
Innovation Solution
A method and apparatus for sidelink carrier selection in a UE, which determines optimal carriers for transmission based on triggering events and metrics such as available grants, channel quality, and congestion status, allowing for continuous use, replacement, or selection of candidate carriers, with priority determination and information exchange with the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is applied for SL transmission in NR, then bandwidth and bitrate are increased, but carrier selection complexity and power consumption increase due to lack of efficient reselection mechanism
Solution Approach 1:
The patent implements dynamic carrier selection and reselection mechanisms where the UE can adaptively switch between carriers based on real-time conditions. The carrier selection is triggered by specific events (channel quality changes, congestion status, grant availability) rather than being static, allowing the system to respond dynamically to changing network conditions while managing complexity through event-driven architecture
Solution Approach 2:
The patent changes carrier selection parameters (priority values, triggering thresholds, measurement metrics) based on network conditions and UE capabilities. By adjusting these parameters dynamically, the system optimizes carrier selection without requiring complex algorithms, resolving the contradiction between improved throughput and reduced selection complexity
2Adaptability or versatility
If multiple carriers are configured for SL transmission, then communication capabilities are enhanced, but power consumption increases due to continuous monitoring and selection
Solution Approach 1:
The patent implements periodic carrier monitoring and reselection triggered by specific events rather than continuous monitoring. The UE monitors carriers periodically or when triggering events occur (channel quality degradation, congestion detection, grant expiration), significantly reducing power consumption while maintaining enhanced communication capabilities across multiple carriers
Solution Approach 2:
The UE autonomously performs carrier selection and reselection based on pre-configured criteria and triggering events without requiring continuous network control. This self-service mechanism allows the UE to manage multiple carriers efficiently, enhancing communication capabilities while minimizing power consumption by making local decisions based on measured parameters
3Ease of manufacture
If LTE carrier selection mechanism is applied to NR SL, then implementation is simplified, but performance is suboptimal due to different capabilities and use cases
Solution Approach 1:
The patent segments the carrier selection mechanism into distinct NR-specific procedures separate from LTE, with dedicated triggering events, measurement metrics, and selection criteria for NR SL. This segmentation allows the system to maintain implementation simplicity through structured procedures while achieving optimal NR-specific performance by addressing the unique capabilities and use cases of NR (such as higher frequencies, advanced MIMO, and diverse V2X scenarios)
Solution Approach 2:
The patent creates a universal carrier selection framework that can handle multiple NR-specific scenarios (V2X, public safety, enhanced mobile broadband) through a common event-driven architecture. This universal mechanism maintains simplicity while adapting to different NR capabilities and use cases, achieving both ease of implementation and optimal transmission performance across diverse applications
Data Source
AI summary
Various embodiments of the present disclosure provide a method for sidelink carrier selection. The method which may be performed by a first user equipment includes: determining, among a set of sidelink carriers configured to the first user equipment, one or more carriers for a sidelink transmission, based on carrier selection performed by the first user equipment itself or according to an instruction from a base station. In accordance with an exemplary embodiment, the method further includes: performing the sidelink transmission to a second user equipment on the one or more carriers determined for the sidelink transmission.