Sidelink Control Signaling for Reduced Latency
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Solution Overview
Problem
Current sidelink communication techniques are deficient in flexibility, leading to inefficiencies and increased latency as they require sidelink data transmissions to occur before sidelink control information can be transmitted, even when no data is being sent, resulting in suboptimal resource utilization and prolonged communication latency, particularly in IoT networks.
Innovation Solution
The proposed solution schedules sidelink control information (SCI) to be transmitted via sidelink communication links even in the absence of sidelink data transmissions, allowing for the scheduling of uplink control information (S-UCI) within a sidelink communication link, including information such as channel state, HARQ bits, periodicity, and OCC, based on SCI-2, enabling efficient resource allocation and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If sidelink control information is transmitted only after sidelink data transmissions, then resource allocation follows traditional protocols, but communication latency increases and resource utilization decreases
Solution Approach 1:
The patent segments the transmission process by separating control information (SCI-2) from data transmissions. SCI-2 is transmitted independently on the sidelink control channel to schedule uplink control information, while data transmissions occur separately on the sidelink shared channel. This segmentation allows control information to be transmitted without waiting for data, reducing communication latency and improving resource utilization efficiency.
2Productivity
If sidelink control information is transmitted independently of data transmissions, then resource utilization improves and latency reduces, but protocol complexity increases
Solution Approach 1:
The patent applies preliminary action by transmitting SCI-2 in advance on the sidelink control channel before the actual data transmission occurs. SCI-2 contains scheduling information that prepares the receiving device for upcoming uplink control information transmissions. This preliminary scheduling action enables efficient resource allocation and reduces latency without significantly increasing protocol complexity, as the scheduling mechanism builds upon existing sidelink protocols.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first wireless device may be configured to receive, from a second wireless device via a sidelink communication link, a sidelink control information (SCI) scheduling an uplink transmission from the first wireless device to the second wireless device. The first wireless device may then generate the uplink transmission based on the SCI. The first wireless device may then transit the uplink transmission to the second wireless device via the sidelink communication link in accordance with the SCI.