Sidelink Buffer Status Reports and Scheduling Requests for NR Vehicle Communication
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Solution Overview
Problem
Current sidelink communication systems in LTE and NR face challenges in efficiently managing Buffer Status Reports (BSR) and Scheduling Requests, particularly in scenarios like vehicle platooning and advanced driving, where diverse use cases with conflicting requirements necessitate improved BSR mapping and SR differentiation for QoS and resource allocation.
Innovation Solution
The introduction of new parameters and procedures for controlling BSR reporting, such as logicalChannelSR-MaskSL, and enhanced SR configurations, along with sidelink-specific BSR and SR procedures, allow for more precise handling of buffer status and resource requests, prioritizing latency and reliability requirements, and enabling sidelink communication over NR Uu.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing BSR and SR procedures are used in sidelink communication, then basic resource allocation is maintained, but QoS requirements and latency performance for diverse use cases cannot be met
Solution Approach 1:
The patent applies local quality by introducing logicalChannelSR-MaskSL parameters that allow different SR behaviors for different logical channels. Each logical channel can be configured with specific SR masking rules, enabling differentiated QoS treatment for various use cases (e.g., vehicle platooning vs. advanced driving) without affecting the entire sidelink communication system.
Solution Approach 2:
The patent implements dynamics through configurable SR opportunities and periodic BSR reporting. The system can dynamically adjust SR transmission timing and BSR reporting frequency based on network conditions and use case requirements, allowing flexible adaptation to varying latency and reliability needs of different sidelink communications.
2Productivity
If SR opportunities are increased for better resource allocation, then resource request responsiveness improves, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent applies partial action by providing SR opportunities only when needed based on configured conditions. Instead of continuous SR transmission, the system uses periodic opportunities and event-triggered SRs, transmitting SRs only when buffer status changes or reporting periods elapse, thereby reducing unnecessary signaling while maintaining efficient resource allocation.
Solution Approach 2:
The patent implements preliminary action through advance configuration of SR parameters and BSR reporting schedules. The network pre-configures logicalChannelSR-MaskSL settings and SR opportunities, allowing UEs to prepare and transmit SRs at predetermined times without requiring real-time complex decision-making, thus simplifying UE processing while ensuring timely resource requests.
3Measurement precision
If BSR reporting frequency is increased for accurate buffer status tracking, then resource allocation precision improves, but transmission time and energy consumption increase
Solution Approach 1:
The patent applies periodic action through configured periodic BSR reporting opportunities. Instead of continuous or frequent BSR transmissions, the system uses periodic reporting where UEs transmit BSRs at scheduled intervals or when specific trigger conditions are met, maintaining adequate buffer status tracking accuracy while significantly reducing transmission frequency and associated time/energy costs.
Data Source
AI summary
Sidelink communication operations may be enhanced through the use of communications requirement signaling, which may include, for example, indications of the type, size, quality of service requirements, pending buffer sizes, and the like, and through the evaluation of such signaled information to determine whether existing grants and logical channels may suffice for new sidelink traffic. Grants may be requested via sidelink scheduling requests and sidelink buffer status reporting, for example, which allow scheduling devices, such as base stations and scheduling user equipment apparatuses, early insight into needs of sidelink traffic for application with divergent QoS requirements.