Sidelink Buffer Status Reporting for Multi-Carrier V2X Resource Allocation
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Solution Overview
Problem
Current V2X communication systems face challenges in efficiently requesting and allocating resources on multiple carriers, particularly in scenarios requiring low latency and high reliability, where existing mechanisms struggle to accurately indicate resource sizes for each frequency point and lack effective data retransmission support.
Innovation Solution
A resource requesting method and device that acquire and report buffer sizes for specific frequency points or anchor frequency points, using Sidelink Buffer Status Reports (BSR) to enable the base station to allocate resources efficiently across multiple frequency points, improving resource allocation efficiency and supporting hybrid automatic retransmission for enhanced data transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE reports buffer status for each frequency point separately using existing mechanisms, then the resource allocation accuracy improves, but the signaling overhead and complexity increase significantly
Solution Approach 1:
The patent segments the buffer status reporting by introducing frequency point identifiers (frequencyPointId) that group multiple frequency points under common destination indexes. This allows the UE to report buffer status for multiple frequency points in a consolidated manner rather than separately for each frequency point, reducing signaling overhead while maintaining allocation accuracy.
Solution Approach 2:
The patent creates a universal destination index structure that can represent multiple frequency points. The destination index is no longer tied to a single frequency point but can encompass multiple frequency points through the frequencyPointId field, making the reporting mechanism more versatile and efficient.
2Reliability
If the system supports data retransmission on multiple carriers, then the data transmission reliability improves, but the resource management complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the UE reports buffer status including information about data that needs retransmission. The base station uses this feedback to allocate resources for retransmission on appropriate frequency points, enabling reliable data transmission while keeping resource management systematic rather than ad-hoc.
Solution Approach 2:
The patent enables dynamic resource allocation for retransmission by allowing the base station to select appropriate frequency points based on current buffer status and channel conditions. The system can dynamically adjust which frequency points are used for retransmission versus initial transmission, optimizing resource utilization.
3Productivity
If the UE autonomously selects resources from resource pool (mode 4), then the network infrastructure burden reduces, but the resource allocation efficiency and collision avoidance capability deteriorates
Solution Approach 1:
The patent applies preliminary action by having the base station pre-configure resource pools and destination indexes for UE autonomous selection. The UE uses these pre-configured structures to make informed resource selections, improving both autonomy and efficiency compared to completely autonomous selection without guidance.
Data Source
AI summary
Provided are a resource requesting method and device, and a resource request processing method and device. The method includes: acquiring, by a terminal, a buffer size corresponding to an same frequency point or anchor frequency point in a logical channel group; reporting, by the terminal, an Sidelink BSR to a base station, where the Sidelink BSR includes at least one of: a destination index corresponding to the same frequency point or anchor frequency point; a logical channel group identifier or a logical channel identifier; or a buffer size.