Sidelink Transmission Indication for Collision Avoidance
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Solution Overview
Problem
In 5G communication systems, sidelink transmissions between user equipment (UEs) often result in collisions due to overlapping resource selections, leading to inefficiencies and reduced spectral efficiency, as existing methods rely heavily on HARQ retransmissions which decrease power and spectral efficiency.
Innovation Solution
User equipment (UEs) employ a transmission indication (TI) to signal their intent to transmit on sidelink sub-channels and monitor reception of transmission grants (TGs) from other UEs, determining whether to proceed based on priority values and resource availability, thereby avoiding collisions and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs rely heavily on HARQ retransmissions to handle sidelink transmission collisions, then transmission reliability is maintained, but power efficiency and spectral efficiency deteriorate
Solution Approach 1:
The patent applies preliminary action by implementing a pre-indication mechanism where UEs signal their transmission intentions before actually transmitting. This allows other UEs to anticipate potential collisions and adjust their resource selections in advance, preventing collisions before they occur rather than relying on post-collision HARQ retransmissions. The pre-indication message contains resource selection information that enables proactive collision avoidance.
2Reliability
If UEs rely heavily on HARQ retransmissions to handle sidelink transmission collisions, then transmission reliability is maintained, but spectral efficiency deteriorates
Solution Approach 1:
The patent implements preliminary action through pre-indication messages that allow UEs to declare their intended transmissions before actual data transmission. This enables the system to resolve resource conflicts in advance through priority-based arbitration, ensuring that only one UE transmits on contested resources. This proactive approach eliminates the need for repeated HARQ retransmissions, thereby improving spectral efficiency while maintaining reliability.
3Device complexity
If UEs select SL resources independently without coordination, then device complexity is reduced, but collision probability increases leading to reduced spectral efficiency
Solution Approach 1:
The patent applies self-service by enabling UEs to autonomously determine transmission priorities and resolve collisions without requiring complex centralized coordination or sophisticated algorithms. Each UE independently evaluates received pre-indication messages, compares priorities, and makes local decisions about resource usage. This distributed self-service approach maintains low device complexity while improving spectral efficiency through coordinated resource selection.
Data Source
AI summary
A user equipment (UE) indicates an intent to transmit on sidelink sub-channels using a transmission indication and then monitors receptions of transmission grants transmitted from one or more other devices, such as UEs or base stations, and determines whether or not to proceed with the sidelink transmission on the sub-channels based on the received transmission grants. A device monitors transmission indications transmitted from UEs to determine a UE that can proceed with a sidelink transmission on sub-channels, and transmits a transmission grant corresponding to the UE that can proceed with the sidelink transmission on sub-channels.