Sidelink Resource Selection via LLR and RSRP Probability
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Solution Overview
Problem
In sidelink wireless communications, user equipment (UE) faces challenges in accurately determining resource availability due to the 'edge' nature of decodability thresholds, leading to incorrect resource selection and potential errors, especially when the decodability of sidelink control information (SCI) is near error thresholds or when using strict reference signal received power (RSRP) thresholds.
Innovation Solution
The UE employs soft methods by selecting resource availability probability values based on log likelihood ratio (LLR) quality values, reference signal received power (RSRP) values, and RSRP thresholds, allowing for more nuanced determination of resource availability, reducing errors by considering multiple thresholds and tolerance ranges, and adjusting these values based on successful or unsuccessful decoding of SCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If strict RSRP thresholds are used for resource selection, then device complexity is reduced, but measurement precision deteriorates leading to incorrect resource availability determination
Solution Approach 1:
The patent changes the parameter from a binary threshold decision to a probabilistic assessment using multiple parameters (LLR quality values, RSRP values, and their combinations). Instead of using a single strict threshold, the system calculates resource availability probability by considering multiple parameter ranges and their relationships, thereby improving measurement precision while maintaining manageable device complexity through structured parameter evaluation.
2Measurement precision
If soft methods with multiple parameters are used for resource selection, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the resource selection process into distinct evaluation stages: first evaluating LLR quality values, then RSRP values, and finally combining them to determine resource availability probability. This segmentation allows the device to handle complex multi-parameter analysis in a structured, step-by-step manner, improving measurement precision while keeping device complexity manageable through organized processing flow.
Solution Approach 2:
The system dynamically adjusts the resource availability probability based on the specific combinations of LLR and RSRP parameter values. Rather than using fixed rules, the device adapts its assessment by considering different parameter ranges and their relationships, allowing flexible and accurate resource selection that responds to varying channel conditions while maintaining systematic processing.
3Reliability
If probabilistic resource availability assessment is used, then reliability is improved, but loss of information increases due to additional processing
Solution Approach 1:
The patent performs preliminary evaluation of LLR quality values and RSRP values before making the final resource selection decision. By pre-assessing these parameters and their combinations, the system builds a comprehensive probabilistic picture of resource availability, improving reliability while minimizing information loss through efficient sequential processing that avoids redundant computations.
Data Source
AI summary
Methods, systems, and devices for wireless communications at a user equipment (UE) are described. The UE may receive control signaling for indicating an availability of a sidelink resource. The UE may attempt to decode the control signaling. The UE may select, based on receiving the control signaling, a log likelihood ratio quality value associated with the control signaling and a reference signal received power value associated with the control signaling. The UE may select a resource availability probability value associated with the sidelink resource based on attempting to decode the control signaling, the log likelihood ratio quality, and the reference signal received power value. The UE may transmit a sidelink message based at least in part on the resource availability probability value.