Dynamic Channel Occupancy Time Determination in Wireless Nodes
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Solution Overview
Problem
In wireless communication systems operating in unlicensed bands, there is a limitation on the duration of channel usage due to Maximum Channel Occupancy Time (MCOT) regulations, which requires devices to periodically release the channel and perform clear channel assessments (CCA) to resume transmission.
Innovation Solution
A method for dynamically determining the channel occupancy time (COT) based on radio condition parameters, allowing wireless nodes to adapt their channel usage duration according to current radio conditions, thereby optimizing channel usage and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a device uses the channel for the maximum allowed duration (MCOT), then the device's channel usage efficiency is improved, but other devices cannot access the channel during this time, reducing overall channel utilization and increasing interference
Solution Approach 1:
The patent applies dynamics by making the channel occupancy time flexible rather than fixed. The transmitting device determines the COT duration dynamically based on whether it detects other devices attempting to access the channel during its transmission, allowing the system to adapt between maximizing individual channel usage and enabling broader channel access based on real-time conditions
Solution Approach 2:
The patent changes the parameter of channel occupancy time from a static maximum value (MCOT) to a variable duration. The device monitors the channel during transmission and adjusts the actual occupancy time by comparing detected signals against a threshold, thereby changing the time parameter to balance between efficient usage and interference reduction
2Adaptability or versatility
If a device performs frequent clear channel assessments (CCA) to check for other devices, then channel access fairness is improved, but power consumption increases due to unnecessary CCA procedures
Solution Approach 1:
The transmitting device performs self-service by autonomously monitoring its own transmission status and detecting whether other devices are attempting to access the channel. Instead of relying on external CCA procedures, the device uses its transmitted signal as a reference to detect overlapping transmissions, thereby determining COT termination independently without additional power-consuming CCA operations
Solution Approach 2:
The patent extracts the CCA procedure from the traditional channel access mechanism. Rather than requiring separate CCA checks before and during channel usage, the device extracts the essential function of detecting other transmissions by monitoring the channel during its own transmission, eliminating redundant assessment steps and reducing power consumption
Data Source
AI summary
A method, performed at a first wireless node, for determining a channel occupancy time, COT, of the first wireless node on a radio channel is disclosed. The method comprises obtaining a radio condition parameter indicative of a condition of the radio channel; and determining the channel occupancy time based on the radio condition parameter.