Sidelink SCI Signaling for Blind Retransmission Resource Control
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Solution Overview
Problem
Current sidelink communication systems lack support for blind retransmission operations, necessitating a communication protocol for such operations.
Innovation Solution
A method and user equipment (UE) are introduced to transmit sidelink control information through physical sidelink control and shared channels, allowing for the indication of stopped sidelink communication and preventing resource allocation for subsequent transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind retransmission operation is not supported in current sidelink communication, then the communication protocol is incomplete, but adding blind retransmission support increases protocol complexity
Solution Approach 1:
The SCI is divided into two separate stages: first SCI transmitted through PSCCH containing resource allocation information, and second SCI transmitted through PSSCH containing communication stop indication. This segmentation allows the protocol to support blind retransmission operations while maintaining manageable complexity by separating control functions into distinct message components.
Solution Approach 2:
The second SCI acts as an intermediary message that carries the communication stop indication from the transmitting UE to the receiving UE. This intermediary mechanism enables blind retransmission control without requiring complex direct negotiation protocols, as the stop indication is embedded within the existing PSSCH transmission framework.
2Productivity
If resource allocation is continued after communication stop, then resource allocation efficiency decreases, but preventing resource allocation requires additional control signaling
Solution Approach 1:
The communication stop indication is merged into the second SCI that is already being transmitted through the PSSCH. By combining the resource allocation information from first SCI and the stop indication from second SCI into a coordinated two-stage transmission, the system prevents unnecessary resource allocation without requiring separate control signaling messages, thus maintaining resource allocation efficiency.
Solution Approach 2:
The second SCI provides feedback to the receiving UE about the communication status (stopped or continued). This feedback mechanism allows the receiving UE to understand whether to expect further transmissions or release resources, improving resource allocation efficiency without requiring complex additional signaling since the feedback is embedded in the existing PSSCH transmission.
Data Source
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AI summary
An operation method of a first terminal in a communication system is provided. The method includes transmitting first SCI to a second terminal, the first SCI including one or more information elements among information indicating time resource(s) for sidelink communication, information indicating frequency resource(s) for the sidelink communication, information indicating a periodicity of physical resources for the sidelink communication, and information indicating an MCS for the sidelink communication. Second SCI is transmitted to the second terminal, the second SCI including information for an HARQ feedback operation and information indicating an NDI. The method further includes performing the sidelink communication with the second terminal based on the first SCI and the second SCI associated with the first SCI.