Sidelink PSCCH Scheduling for Unlicensed Band Slot Timing
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Solution Overview
Problem
When using an unlicensed band for sidelink communication, the mismatch between COT acquisition timing and slot start timing leads to inefficient frequency utilization due to long reservation signals without data, increasing control information overhead and potentially causing communication interference.
Innovation Solution
Implement a communication method that uses two distinct PSCCHs for scheduling sidelink communication, allowing other devices to recognize resource allocations even if they miss the initial PSCCH, thereby improving frequency utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reservation signal is transmitted from COT acquisition timing to slot start position, then channel occupancy is ensured, but frequency utilization efficiency deteriorates due to long transmission section without data
Solution Approach 1:
The patent divides the reservation signal transmission into multiple segments by introducing a second PSCCH. The first PSCCH transmits scheduling information at the initial position, while the second PSCCH transmits the same or redundant scheduling information at a later position within the slot. This segmentation allows receiving devices to acquire scheduling information at different times, reducing the need for continuous reservation signal transmission and improving frequency utilization efficiency while maintaining channel occupancy reliability.
2Device complexity
If scheduling information is transmitted only at initial PSCCH position, then control overhead is minimized, but other devices may miss the information causing retransmission and interference
Solution Approach 1:
The patent applies local quality by transmitting scheduling information with different characteristics at different positions. The first PSCCH transmits scheduling information at the initial position with standard format, while the second PSCCH transmits scheduling information at a later position potentially with enhanced redundancy or different formatting. This allows devices that missed the first transmission to reliably acquire scheduling information from the second transmission, improving delivery reliability without significantly increasing overall control overhead.
Data Source
AI summary
A communication method of the present disclosure includes performing sidelink communication with a first communication device. The communication method includes performing scheduling of a resource for performing sidelink communication using a first PSCCH. The communication method includes transmitting a second PSCCH different from the first PSCCH on the scheduled resource.