Sidelink PSSCH Resource Allocation for V2X Interference
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing sidelink communications, particularly in NR V2X systems, due to limitations in channel access schemes that lead to hidden node interference, in-band emissions, and near-far effects, which affect link reliability and spectrum efficiency, especially when handling unicast and broadcast traffic simultaneously.
Innovation Solution
The proposed solution involves a unified channel sensing approach and control signaling design for sidelink control channels, including a universal PSCCH structure that supports both standalone and non-standalone operations, variable spectrum efficiency, and sub-channelization procedures to adapt to different carrier bandwidths and subcarrier spacings, ensuring seamless coexistence of unicast and broadcast traffic without performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional channel access schemes are used in sidelink communications, then device simplicity is maintained, but hidden node interference and near-far effects occur leading to reduced link reliability
Solution Approach 1:
The patent implements preliminary channel sensing and resource selection procedures where UEs perform clear channel assessment (CCA) and select resources based on sensed interference levels before actual transmission. This preliminary action allows the system to avoid hidden node conflicts by pre-identifying suitable resources and coordinating transmissions, thereby improving link reliability without requiring complex real-time interference management.
2Adaptability or versatility
If unicast and broadcast traffic are handled simultaneously using existing schemes, then communication versatility is achieved, but performance degradation occurs due to resource conflicts
Solution Approach 1:
The patent segments the sidelink resource pool into dedicated unicast resources and broadcast resources, with further subdivision into sub-channels for different traffic types. This segmentation allows unicast and broadcast traffic to operate independently on separate resource sets, eliminating resource conflicts and performance degradation while maintaining support for multiple traffic types simultaneously.
3Productivity
If fixed sub-channelization is used, then implementation simplicity is maintained, but spectrum utilization efficiency decreases in diverse V2X scenarios
Solution Approach 1:
The patent implements dynamic sub-channelization where the number of sub-channels, their sizes, and resource allocations are adaptively configured based on V2X scenario requirements, traffic load, and channel conditions. This dynamic configuration allows the system to optimize spectrum efficiency for different scenarios (basic safety, advanced driving applications) while the network provides the configuration parameters to maintain implementation feasibility.
4Reliability
If rate-matching around control resources is implemented, then control channel reliability is improved, but data channel spectrum efficiency decreases
Solution Approach 1:
The patent applies rate-matching selectively around only the necessary control resources (PSCCH) rather than uniformly across all control regions. This localized rate-matching approach ensures control channel reliability by protecting critical control information while minimizing the impact on data channel resources. The system optimizes the balance by precisely identifying which resource elements require protection and applying rate-matching only in those specific locations.
Data Source
AI summary
Some embodiments of this disclosure include apparatuses and methods for sidelink procedures and structures for transmission and reception of non-standalone and standalone PSSCH in a wireless communication system.