Cyclic Prefix Extension for Sidelink COT Sharing
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Solution Overview
Problem
In wireless communication systems, particularly in sidelink communications over shared radio frequency bands, there is a challenge in efficiently managing channel occupancy time (COT) to ensure seamless sharing among user equipment devices (UEs), while adhering to listen-before-talk (LBT) gap time thresholds.
Innovation Solution
The implementation of a cyclic prefix (CP) extension in sidelink transmissions allows for precise control of gap durations between initiating UE transmissions and responding UE transmissions, ensuring that the gap duration satisfies the LBT gap time threshold, thereby enabling efficient COT sharing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a standard cyclic prefix is used in sidelink transmissions, then the transmission structure is simple and compatible with existing systems, but the gap duration between transmissions cannot be precisely controlled to satisfy LBT gap time thresholds
Solution Approach 1:
The patent applies a cyclic prefix extension to the first sidelink transmission before the gap duration elapses. This preliminary action extends the CP duration to precisely control the gap timing, ensuring the gap duration satisfies the LBT gap time threshold while maintaining compatibility with existing transmission structures.
Solution Approach 2:
The patent changes the cyclic prefix parameter by extending its duration beyond the standard CP length. This parameter modification enables precise control of the gap duration between transmissions, allowing the system to meet LBT requirements without fundamentally altering the transmission structure.
2Measurement precision
If the gap duration is extended to ensure proper timing between transmissions, then timing accuracy is improved, but time and resource consumption increases
Solution Approach 1:
The cyclic prefix extension is applied in advance to the first transmission, embedding the timing control mechanism within the existing transmission structure. This preliminary timing adjustment ensures accurate gap duration control without requiring additional time beyond what is already allocated for the transmission and gap.
3Productivity
If multiple sidelink UEs share the same COT, then spectrum efficiency is improved, but LBT procedure complexity and resource management difficulty increase
Solution Approach 1:
The patent enables responding UEs to autonomously determine their transmission timing based on the detected first transmission and the configured gap duration. Each UE independently calculates its transmission time without requiring complex centralized coordination, allowing multiple UEs to share the COT efficiently while keeping individual device complexity manageable.
Data Source
AI summary
Wireless communications systems and methods related to use of cyclic prefix (CP) extensions for channel occupancy time (COT) sharing among sidelink user equipment devices (UEs) are provided. A first UE detects a first sidelink transmission in a COT, the COT for sharing with multiple sidelink UEs including the first sidelink UE. The first UE may determine a CP extension length for transmitting a second sidelink transmission after the first sidelink transmission, where a gap duration between the first sidelink transmission and the second sidelink transmission satisfies a listen-before-talk (LBT) gap time threshold. The first UE may apply a CP extension having the CP extension length to the second sidelink transmission and transmit, to a second sidelink UE, the second sidelink transmission with the CP extension.