Terminal Device COT Extension Across Sync Boundaries
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Solution Overview
Problem
Current synchronous access technologies in wireless communication systems, such as those in the 6 GHz band, face challenges in determining whether to extend channel occupancy time (COT) and ensuring continuous communication across sync boundaries, leading to inefficiencies in channel usage and communication reliability.
Innovation Solution
A terminal device is equipped with a wireless communication unit and a control unit that transmits and receives information to determine whether to extend COT, ensuring that COT ends at least by a first sync boundary unless extended to a second sync boundary, allowing for synchronized and efficient channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If synchronous access is implemented in the unlicensed band, then area throughput and communication reliability are improved through spatial reuse and CoMP, but channel occupancy time cannot be extended across sync boundaries leading to communication interruptions
Solution Approach 1:
The base station performs channel access procedures and secures channel occupancy in advance before the sync boundary arrives. By determining COT extension status beforehand and notifying the terminal device, the system ensures that channel access is already granted and ready to continue across the sync boundary without interruption, thus maintaining communication reliability while enabling synchronous access benefits
2Reliability
If COT is extended beyond the first sync boundary to the second sync boundary, then communication continuity is maintained, but channel access coordination becomes more complex
Solution Approach 1:
The base station determines whether COT extension is possible and notifies the terminal device of this determination. The terminal device then adjusts its uplink transmission timing accordingly - either ending at the first sync boundary or extending to the second sync boundary based on the received notification. This feedback mechanism simplifies coordination by centralizing the decision-making at the base station while enabling flexible COT management
Data Source
AI summary
A terminal device is time-synchronized with a communication device at a synchronization boundary. The terminal device includes a wireless communication unit and a control unit. The control unit is configured to transmit determination information for determining whether or not to extend a channel occupancy time (COT) via a wireless communication unit, receive information regarding the COT, and perform uplink transmission on the basis of the information regarding the COT that has been received. In a case where the information regarding the COT does not indicate extension of the COT, the COT ends at least by a first sync boundary. In a case where the information regarding the COT indicates extension of the COT, the COT ends after the first sync boundary and by the end of a second sync boundary that occurs following the first sync boundary.