NR V2X Sidelink Resource Selection for Low-Latency Reliability
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Solution Overview
Problem
Conventional LTE-V2X communication systems face challenges with high latency, insufficient reliability, sensitivity to interference, and hidden node problems, which are not adequately addressed in supporting high-reliability low-latency sidelink communications with varying traffic patterns.
Innovation Solution
Implementing intelligent sensing and resource selection procedures, along with enhanced UE processing behaviors for PSCCH and PSSCH demodulation/decoding, to optimize sidelink resource allocation for both periodic and aperiodic traffic, using large and small-scale sensing techniques and multiple decoding attempts to improve reliability and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional LTE-V2X communication systems are used, then basic sidelink communication is supported, but high reliability and low latency requirements are not met
Solution Approach 1:
The system performs sensing and resource selection in advance before actual data transmission. UEs identify and reserve suitable time-frequency resources ahead of time, ensuring that when data needs to be transmitted, ready-to-use resources are already allocated, thus reducing latency while maintaining high reliability through pre-validated resource choices
Solution Approach 2:
The resource allocation system dynamically adapts to varying traffic patterns and channel conditions. UEs can switch between different resource allocation modes (mode 1 network-controlled, mode 2 autonomous, mode 3 enhanced autonomous) based on real-time requirements, enabling the system to optimize for either reliability or latency depending on current operational needs
2Reliability
If resource allocation is optimized for periodic traffic, then periodic communication reliability improves, but aperiodic traffic performance deteriorates
Solution Approach 1:
The resource allocation framework is designed to handle multiple traffic types through a unified mechanism. The same sensing and resource selection procedures can serve both periodic and aperiodic traffic, with the system automatically adapting its behavior based on traffic characteristics. This allows periodic traffic to benefit from reserved resources while aperiodic traffic can utilize available resources without dedicated reservations
Solution Approach 2:
The system adjusts key parameters such as sensing window duration, resource selection window size, and reservation interval based on traffic type. For periodic traffic, parameters are optimized for regular intervals and predictable patterns, while for aperiodic traffic, parameters adapt to accommodate irregular arrivals and variable timing requirements
3Reliability
If sensing and resource selection procedures are enhanced, then resource allocation reliability improves, but processing complexity increases
Solution Approach 1:
The complex resource allocation process is divided into distinct phases: sensing phase where UEs monitor channel conditions and identify occupied resources, resource selection phase where suitable resources are chosen from available options, and resource reservation phase where selected resources are marked for future use. This segmentation allows each phase to be optimized independently and simplifies the overall processing by breaking down the complex task into manageable steps
Solution Approach 2:
The patent introduces intermediate data structures and procedures to manage complexity. For example, UEs maintain lists of candidate resources, occupied resources, and reserved resources as intermediate representations that simplify decision-making. These intermediaries act as buffers between raw sensing data and final resource selection, reducing the computational burden on UEs while maintaining allocation reliability
Data Source
AI summary
An apparatus of user equipment (UE) includes processing circuitry coupled to a memory, where to configure the UE for New Radio (NR) vehicle-to-everything (V2X) sidelink communication. The processing circuitry is to determine a set of candidate resources of the UE from a sidelink resource pool, the sidelink resource divided into multiple time slots, frequency channels, and frequency sub-channels. Sidelink control information (SCI) is encoded for transmission to a second UE via a physical sidelink control channel (PSCCH). The SCI indicates a plurality of transmission resources of the set of candidate resources. A transport block is mapped across the plurality of transmission resources. A physical sidelink shared channel (PSSCH) is encoded for transmission to the second UE using the plurality of transmission resources, the PSSCH encoded to include the mapped transport block.