Common Clock-Triggered LBT for Wireless Channel Access
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Solution Overview
Problem
Wireless communication networks face interference and congestion due to increased demand for mobile broadband access, leading to degraded performance in both downlink and uplink transmissions, especially as more user equipment (UEs) access long-range wireless networks and short-range systems are deployed in communities.
Innovation Solution
Implementing a common clock-triggered listen before talk (LBT) procedure during periodic quiet intervals to establish a channel occupancy time (COT) that ends at a subsequent synchronization boundary, allowing nodes to transmit data on shared communication channels efficiently and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If more user equipment (UEs) access the wireless network to meet growing demand for mobile broadband, then network capacity and coverage are improved, but interference and congestion increase leading to degraded transmission performance
Solution Approach 1:
The patent implements periodic quiet intervals (QIs) within synchronization boundaries where nodes refrain from transmitting, creating regular periods of reduced activity. This periodic action allows the channel to clear from interference while maintaining overall network capacity, directly addressing the contradiction between supporting more UEs and managing interference levels.
Solution Approach 2:
The listen-before-talk (LBT) procedure performs preliminary channel sensing before transmission begins. Nodes check the channel status in advance during quiet intervals and only transmit if the channel is clear, preventing interference from occurring in the first place while enabling more UEs to access the network efficiently.
2Productivity
If nodes transmit data continuously to improve throughput, then productivity increases, but channel access conflicts and interference increase
Solution Approach 1:
The LBT procedure provides feedback about channel status to transmitting nodes. Nodes continuously monitor the channel and adjust their transmission behavior based on detected interference levels and quiet interval timing, enabling high throughput during clear periods while avoiding conflicts during busy periods.
Solution Approach 2:
The system dynamically adjusts channel access behavior based on real-time conditions. Nodes transition between transmitting and listening states according to synchronization boundaries and quiet intervals, optimizing throughput when the channel is clear while minimizing interference when other nodes are active.
3Object-affected harmful factors
If nodes perform LBT procedures frequently to reduce interference, then interference management improves, but channel access delay increases
Solution Approach 1:
By scheduling LBT procedures to occur periodically at synchronization boundaries and during predetermined quiet intervals, the system reduces the frequency of LBT operations compared to continuous monitoring. This periodic approach maintains interference management while significantly reducing the time nodes spend sensing rather than transmitting.
Data Source
AI summary
A method of wireless communication includes identifying, by a first node configured for operation in a synchronous communication mode, a current synchronization boundary according to a common clock of the synchronous communication mode. The method further includes performing, by the first node, a common clock-triggered (CCT) listen before talk (LBT) procedure of a shared communication channel during a periodic quiet interval at the current synchronization boundary. The method further includes establishing, by the first node, in response to success of the CCT LBT procedure, a channel occupancy time (COT) configured to end at a subsequent synchronization boundary and transmitting, by the first node, data on the shared communication channel during the COT.