Mini-Slot Sidelink Transmission in Unlicensed Bands
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Solution Overview
Problem
The existing sidelink (SL) channel structure in unlicensed bands, which uses fixed-length slots for transmission, leads to inefficient resource utilization and potential channel preemptions due to uncertain idle times and fixed starting positions for transmissions.
Innovation Solution
Implementing a mini-slot based transmission method that allows for SL data reception and transmission in candidate positions within mini-slots, where the length of the mini-slot is less than one slot, enabling flexible starting positions and improved resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If slot-based transmission with fixed starting positions is used, then transmission structure is simple and standardized, but resource utilization is low and channel preemptions occur due to uncertain idle times
Solution Approach 1:
The patent divides a slot into multiple mini-slots, each with its own starting position and duration. This segmentation allows the system to start transmissions at multiple points within a slot rather than only at slot boundaries, thereby improving resource utilization while maintaining a structured approach through predefined mini-slot configurations.
Solution Approach 2:
The patent introduces dynamic selection of mini-slot starting positions and durations based on channel conditions and LBT outcomes. The terminal can flexibly choose which mini-slot to use for transmission, adapting to uncertain idle times in unlicensed bands, thus resolving the contradiction between structural simplicity and resource efficiency.
2Stability of the object's composition
If transmission is delayed to next slot starting position, then fixed transmission structure is maintained, but transmission latency increases and channel may be preempted
Solution Approach 1:
The patent pre-defines multiple mini-slot starting positions and durations within each slot before transmission occurs. When channel becomes idle, the terminal can immediately select and use the appropriate pre-configured mini-slot without waiting for slot boundary, thus reducing latency while maintaining structural stability through predefined configurations.
Solution Approach 2:
The system dynamically selects among multiple pre-defined mini-slot options based on real-time channel conditions. This allows the transmission structure to adapt flexibly to actual channel availability, reducing delays caused by rigid slot-based timing while preserving overall structural organization through the predefined mini-slot framework.
3Ease of operation
If fixed slot length is used, then resource allocation is straightforward, but resource utilization efficiency decreases due to mismatch between transmission opportunities and channel idle times
Solution Approach 1:
By segmenting slots into multiple mini-slots with different starting positions and durations, the system provides finer-grained resource allocation units. This allows more precise matching between transmission opportunities and channel idle periods, improving resource utilization efficiency while keeping allocation straightforward through predefined mini-slot templates.
Solution Approach 2:
The patent changes the time domain parameters of transmission resources by introducing mini-slots with variable starting positions and durations. This allows the system to adjust transmission timing parameters to better match channel conditions, improving resource utilization efficiency while maintaining ease of operation through standardized mini-slot configurations.
Data Source
AI summary
This application provides a transmission method, a device, and a readable storage medium. The method includes: receiving, by a first terminal by detecting a physical sidelink control channel (PSCCH) in a candidate position of the PSCCH in a mini-slot, sidelink (SL) data sent by a second terminal. The length of the mini-slot is less than one slot, and one slot includes one or more starting positions of the mini-slot.