NR V2X Sidelink Resource Selection Using Dynamic Scheduling Windows
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Solution Overview
Problem
Current NR V2X sidelink communications face challenges in efficient resource selection and reselection, particularly in terms of latency, data rate, and reliability, especially for periodic and aperiodic traffic, which affects the robustness and efficiency of resource allocation.
Innovation Solution
The proposed solution involves mechanisms for resource selection and reselection in NR V2X sidelink communications, including the use of Reference Signal Receive Power (RSRP) threshold measurements for resource exclusion, Hybrid Automatic Repeat Request (HARQ) round-trip time aware resource selection, and dynamic scheduling windows to improve resource allocation efficiency and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional resource selection methods are used in NR V2X sidelink communications, then the basic communication function is maintained, but latency increases and reliability decreases due to inefficient resource allocation
Solution Approach 1:
The patent applies preliminary action by performing resource selection and sensing operations in advance before actual data transmission. The UE selects candidate resources and performs sensing window operations prior to the transmission time, allowing faster resource allocation decisions and reducing latency while maintaining reliability through pre-computed resource choices.
Solution Approach 2:
The patent implements dynamics by enabling dynamic resource reselection based on real-time channel conditions. The sensing window mechanism allows the UE to adaptively adjust resource selections based on detected transmissions and channel state information, optimizing both latency and reliability through dynamic adaptation rather than static allocation.
2Reliability
If resource selection is performed without considering HARQ round-trip time, then the selection process is simpler, but resource allocation becomes less robust and reliable
Solution Approach 1:
The patent applies feedback by incorporating HARQ round-trip time information into the resource selection process. The UE uses feedback signals and HARQ status to adjust resource selections, ensuring that retransmission timing is properly accounted for. This feedback mechanism enhances robustness by aligning resource allocation with actual transmission and reception cycles.
Solution Approach 2:
The patent uses preliminary action by pre-calculating resource selections that account for HARQ round-trip time before actual transmission occurs. The sensing window operation performs advance assessment of channel conditions and resource availability, incorporating expected HARQ feedback timing, thereby ensuring robust resource allocation without requiring complex real-time adjustments.
3Productivity
If a single sidelink control information is used to indicate multiple resources, then signaling efficiency improves, but the complexity of resource indication increases
Solution Approach 1:
The patent applies merging by combining multiple resource indications into a single sidelink control information structure. The SCI format is designed to efficiently encode multiple candidate resources and their associated parameters, allowing the UE to convey resource selection decisions for multiple slots or sub-channels within one control signal, thereby improving signaling efficiency while managing complexity through structured encoding.
Solution Approach 2:
The patent uses segmentation by dividing the resource indication into manageable components within the SCI structure. The control information is segmented into fields that indicate different resource parameters (time resources, frequency resources, power levels) separately, allowing efficient encoding and decoding while maintaining clarity. This segmentation approach enables multiple resources to be indicated through a single SCI without overwhelming complexity.
Data Source
AI summary
Embodiments of a user equipment (UE) configured for NR V2X sidelink selection and reselection are generally described herein. In some embodiments, a selected set of candidate resources are scheduled using a single sidelink control information (SCI) within a scheduling window. In some embodiments, sidelink resources are excluded based on a HARQ round trip time. In some embodiments, sidelink control signalling supports the reservation and indication of multiple sidelink resources.