NR-U Channel Occupancy Coordination for Terminal-Initiated COT
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Solution Overview
Problem
In New Radio-based access to unlicensed spectrum (NR-U) systems, there is a challenge in ensuring the reasonable coexistence of channel occupancy times (COT) initiated by both network and terminal devices, as existing systems only support COT initiation by the network device, limiting communication performance.
Innovation Solution
The terminal device is allowed to initiate its own COT by determining a first periodic channel occupancy, which can be configured or shared with the network device, ensuring fair spectrum usage and reducing collision risks through conditions such as energy detection thresholds and resource availability checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network device initiates COT alone, then the network device can control channel access, but the terminal device cannot initiate its own COT leading to limited communication performance
Solution Approach 1:
The patent segments the COT initiation capability by introducing two distinct types of periodic channel occupancy: first periodic channel occupancy for terminal device initiation and second periodic channel occupancy for network device initiation. This segmentation allows both terminal devices and network devices to independently initiate COTs according to their respective needs, thereby improving communication performance while maintaining clear role differentiation.
2Productivity
If both network device and terminal device initiate COT independently, then communication performance improves, but collision between COTs on unlicensed spectrum increases
Solution Approach 1:
The patent introduces dynamic adjustment mechanisms where the terminal device determines whether to initiate the first channel occupancy based on conditions such as energy detection thresholds and resource availability checks. The network device can also adjust the second periodic channel occupancy configuration based on system state. This dynamic behavior allows the system to adapt to changing conditions and avoid COT collisions while maintaining high communication performance.
3Productivity
If the terminal device always initiates COT, then terminal device can access channel frequently, but it may collide with network device COT and waste spectrum resources
Solution Approach 1:
The patent employs parameter-based control where the terminal device monitors energy detection thresholds and resource availability parameters before initiating COT. The network device configures parameters such as the period of second periodic channel occupancy and the relationship between first and second periodic channel occupancies. By dynamically adjusting these parameters based on system conditions, the terminal device can access the channel frequently when appropriate while avoiding collisions that would waste spectrum resources.
Data Source
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AI summary
Embodiments of the present application provide a wireless communication method, a terminal device, and a network device, where a COT initiated by the network device and a COT initiated by the terminal device can reasonably coexist on an unlicensed spectrum. The wireless communication method includes: the terminal device determining a first periodic channel occupancy, the first periodic channel occupancy being a channel occupancy for the terminal device to perform initiation, the first periodic channel occupancy including a first channel occupancy; the terminal device initiating the first channel occupancy, or, the terminal device determining whether to initiate the first channel occupancy.