Enhanced COT Sharing for Cell-Edge Wireless Nodes
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Solution Overview
Problem
Current channel occupancy time (COT) sharing rules in wireless communications are inadequate for nodes located at the edge of large cells, leading to insufficient interference protection when operating in shared spectrum, as they assume proximity between sharing nodes.
Innovation Solution
Implement enhanced COT sharing methods where wireless devices receive indications of listen before talk (LBT) gaps and determine whether slots within the COT are occupied, performing appropriate LBT procedures and transmitting signals only after successful detection, allowing for flexible and safe channel access even at cell edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If current COT sharing rules are used, then channel access is simplified for nearby nodes, but interference protection is insufficient for cell-edge nodes
Solution Approach 1:
The patent applies different LBT procedures based on the node's location and distance from the COT initiating node. Cell-edge nodes perform more stringent LBT procedures (e.g., Category 4 LBT with longer backoff) compared to cell-center nodes, providing location-adaptive interference protection while maintaining operational simplicity through automated distance-based classification.
Solution Approach 2:
The patent modifies LBT parameters such as backoff window size, contention window range, and energy detection thresholds based on the node's distance from the COT initiating node. This dynamic parameter adjustment ensures adequate interference protection for distant cell-edge nodes while keeping the access procedure simple for nearby nodes.
2Reliability
If LBT procedures are performed during LBT gaps, then channel access safety is improved, but channel occupancy time is reduced
Solution Approach 1:
The patent performs LBT procedures during designated LBT gaps that occur before the actual data transmission within the COT. This preliminary channel sensing ensures safe channel access is established in advance, preventing interference during the main transmission period and thereby protecting the overall COT duration.
Solution Approach 2:
The patent implements LBT procedures only during specific LBT gaps rather than continuously throughout the entire COT. This partial action approach provides sufficient channel safety verification at critical transition points without excessively reducing the usable transmission time, balancing safety requirements with efficient channel utilization.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A wireless device (base station or UE) may receive an indication of a listen before talk (LBT) gap for sharing a channel occupancy time (COT), the COT being acquired by another wireless device (base station or UE), and detect whether a slot within the COT is occupied by the other wireless device, the slot occurring prior to the LBT gap. The wireless device may also, responsive to detecting that the slot is occupied by the other wireless device, perform an LBT procedure during the LBT gap, and, responsive to a successful LBT procedure, transmit a signal to the other wireless device within the COT.