Sidelink Feedback Mini-Slot Structure for Lower Latency
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Solution Overview
Problem
Wireless communication systems face high latency in sidelink communications due to the allocation of sidelink feedback messages at the end of slots, leading to communication delays and inefficiencies.
Innovation Solution
Implementing short transmission time intervals (TTIs) or mini-slots for sidelink feedback, where automatic gain control information is transmitted in the first symbol period, sidelink feedback messages in the second symbol period, and a switching gap in the third symbol period, allowing for earlier transmission and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If sidelink feedback messages are allocated at the end of slots, then the system maintains simple slot-based structure, but latency increases and communication efficiency deteriorates
Solution Approach 1:
The patent divides a slot into multiple short transmission time intervals (TTIs), where each short TTI can independently carry sidelink feedback messages. This segmentation allows feedback to be transmitted earlier within the slot rather than waiting for the end, thereby reducing latency while maintaining the overall slot-based structure through controlled complexity increase.
2Reliability
If short TTIs are used for sidelink feedback, then latency is reduced and reliability is improved, but device complexity and switching requirements increase
Solution Approach 1:
The patent incorporates a switching gap between the second symbol period (sidelink feedback transmission) and third symbol period (receiving mode) to allow the UE to prepare for mode switching in advance. This preliminary action reduces the complexity of rapid switching by providing buffer time, thereby supporting reliable short TTI operation without excessive device complexity.
3Productivity
If UEs switch between transmitting and receiving modes rapidly, then short TTI feedback is enabled, but switching complexity and power consumption increase
Solution Approach 1:
The patent structures the short TTI with periodic patterns: AGC information in the first symbol period, sidelink feedback in the second symbol period, and a switching gap in the third symbol period. This periodic structure allows the UE to switch modes at predictable intervals rather than continuously, reducing power consumption while maintaining high feedback transmission speed.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A sidelink message may be scheduled for a UE during a first short transmission time interval (TTI). The first short TTI and a second short TTI for transmitting a sidelink feedback message corresponding to the sidelink message may both be shorter in duration than a another, longer type of TTI. The UE may transmit automatic gain control information in a first symbol period of the second TTI, transmit the sidelink feedback message in a second symbol period of the second TTI (after the first symbol period of the second TTI), and switch from operating in a transmitting mode to operating in a receiving mode during a third symbol period of the second TTI (after the second symbol period of the second TTI).