Multi-Hop Sidelink Access Across Shared COTs
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Solution Overview
Problem
Existing sidelink communication technologies face challenges in efficiently utilizing shared channel occupancy times (COT) in unlicensed bands, particularly in multi-hop scenarios, which affect the performance of communication systems.
Innovation Solution
A method and device for multi-hop sidelink communication that involves a first user equipment (UE) receiving COT sharing information from a second UE, determining conditions for performing SL transmissions within a shared COT, and executing Type 2 SL channel access procedures to efficiently utilize the shared COT for 1-hop and 2-hop SL communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-hop sidelink communication is performed in shared COT in unlicensed band, then system efficiency and resource utilization are improved, but communication reliability and coordination complexity increase due to multiple UEs sharing the same channel occupancy time
Solution Approach 1:
The shared COT is segmented into multiple accessible periods, where each period can be independently allocated to different UEs for SL transmission. This segmentation allows multiple hops to occur within the same COT while maintaining clear boundaries and reducing interference, thus improving system efficiency without compromising reliability
Solution Approach 2:
The COT initiating UE performs preliminary channel access and COT establishment before other UEs can perform SL transmissions. This preliminary action ensures that the channel is properly acquired and configured, providing a reliable foundation for subsequent multi-hop transmissions within the shared COT
2Productivity
If multiple UEs perform SL transmission within shared COT, then resource utilization is improved, but channel access coordination complexity increases
Solution Approach 1:
The channel access mechanism is made dynamic through Type 2 SL channel access procedures, where UEs can adaptively access the channel within the shared COT based on current conditions. This dynamic approach allows flexible resource utilization while maintaining manageable coordination complexity through standardized access rules
Solution Approach 2:
The COT sharing information acts as an intermediary mechanism that coordinates channel access among multiple UEs. By transmitting COT sharing information between UEs, the system enables cooperative channel access without requiring complex centralized coordination, thus improving resource utilization while keeping coordination complexity manageable
3Productivity
If Type 2 SL channel access procedure is implemented in shared COT, then transmission efficiency is improved, but access condition verification complexity increases
Solution Approach 1:
Each UE autonomously performs Type 2 SL channel access procedures and verifies access conditions based on pre-configured parameters and received COT sharing information. This self-service approach improves transmission efficiency by enabling autonomous access decisions while managing verification complexity through standardized procedures that UEs can execute independently
Data Source
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AI summary
Provided are a method and device of multi-hop sidelink communication in a shared COT. A method of a first user equipment (UE) may comprise receiving channel occupancy time (COT) sharing information from a second UE, receiving first sidelink (SL) transmission from a third UE within a shared COT according to the COT sharing information, determining whether second SL transmission is performed within the shared COT based on one or more conditions, and performing the second SL transmission in the shared COT upon determining that the second SL transmission is performed.