Half-Duplex-Aware Sidelink Resource Selection
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Solution Overview
Problem
In wireless communication systems, half-duplex UEs face inefficiencies when scheduled for full-duplex communications, leading to reduced throughput due to the inability to simultaneously transmit and receive data on the same resource, especially when resources reserved by other UEs are incorrectly identified as available.
Innovation Solution
The proposed solution involves a PHY layer at a UE excluding resources on which it is scheduled to receive or other UEs are scheduled to transmit from the set of available resources for sidelink transmissions, using sidelink control information and parameters to determine available resources, and reporting only a threshold percentage of resources to avoid scheduling conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resources reserved by other UEs are incorrectly identified as available for sidelink transmission, then resource utilization increases, but communication reliability deteriorates due to half-duplex conflicts
Solution Approach 1:
The patent applies preliminary action by having the PHY layer proactively identify and exclude resources where the UE is scheduled to receive or where other UEs are scheduled to transmit, before the scheduling conflict occurs. This pre-identification of unavailable resources prevents half-duplex conflicts from happening, ensuring that only truly available resources are reported to the MAC layer for sidelink transmission scheduling.
2Adaptability or versatility
If all available resources are reported to the MAC layer, then scheduling flexibility increases, but system efficiency deteriorates due to increased scheduling conflicts
Solution Approach 1:
The patent applies the taking out principle by extracting and removing resources that are actually unavailable (where the UE is scheduled to receive or other UEs are scheduled to transmit) from the set of resources reported to the MAC layer. This filtering action ensures that only genuinely available resources are presented for scheduling, thereby preventing half-duplex conflicts while maintaining scheduling flexibility within the filtered resource set.
3Measurement precision
If the UE monitors all resources for sidelink transmission, then resource selection accuracy improves, but energy consumption increases
Solution Approach 1:
The patent applies the taking out principle by extracting and removing from monitoring the resources where the UE is scheduled to receive or where other UEs are scheduled to transmit. This selective exclusion reduces the total number of resources the PHY layer needs to monitor and evaluate, thereby reducing energy consumption while maintaining accurate identification of truly available resources for sidelink transmission.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described to support half-duplex-aware resource selection in sidelink. A physical (PHY) layer at a user equipment (UE) may report available resources to a medium access control (MAC) layer excluding some resources on which the UE is scheduled to receive or other UEs are scheduled to transmit. Specifically, the PHY layer may exclude resources on which the UE is scheduled to receive from a set of resources available for a sidelink transmission from the UE. Similarly, the PHY layer at the UE may exclude resources on which other UEs are scheduled to transmit from a set of resources available for a sidelink transmission to those UEs. A MAC layer at the UE may indicate to the PHY layer (e.g., directly or indirectly) the resources to be excluded when reporting available resources.