NR-U COT Selection for Deterministic Transmission
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Solution Overview
Problem
In 3GPP Release 16, the ambiguity in Channel Occupancy Time (COT) management leads to non-deterministic behavior when multiple COTs are available for transmission, and the challenge of determining valid idle periods for UL/DL preemption and cancellation in NR-U systems, especially with overlapping FFPs, complicates resource allocation and interference management.
Innovation Solution
The method involves determining and selecting between base station-initiated and UE-initiated COTs based on predefined rules, such as priority and idle period considerations, to ensure deterministic behavior and valid idle periods for transmission, thereby optimizing resource usage and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple COTs are available for transmission in NR-U systems, then transmission opportunities increase, but non-deterministic behavior occurs in COT selection
Solution Approach 1:
The patent applies parameter changes by modifying the COT selection criteria based on transmission direction (uplink/downlink) and COT initiation type (base station-initiated/UE-initiated). By changing the selection parameters dynamically according to transmission characteristics, the system resolves non-deterministic behavior while maintaining multiple transmission opportunities.
Solution Approach 2:
The patent implements dynamic COT selection where the radio node adapts its behavior based on real-time transmission requirements. The selection of which COT to use is not static but dynamically determined by the current transmission direction and COT availability, enabling deterministic behavior in a dynamic multi-COT environment.
2Productivity
If base station-initiated and UE-initiated COTs are both available, then resource utilization improves, but ambiguity in idle period determination increases
Solution Approach 1:
The patent segments the COT management by clearly separating base station-initiated COTs from UE-initiated COTs and defining distinct idle period rules for each type. This segmentation eliminates ambiguity by providing clear, type-specific idle period determination criteria rather than a single complex set of rules.
Solution Approach 2:
The patent applies preliminary action by pre-defining the idle period determination rules for each COT type before transmission occurs. The radio node is configured with clear criteria in advance for determining idle periods based on COT initiation type, eliminating the need for complex real-time decision-making.
3Productivity
If COT sharing is implemented between base station and UE, then spectrum efficiency increases, but interference management complexity increases
Solution Approach 1:
The patent applies local quality by assigning different idle period requirements and transmission rules to different COT types based on their specific characteristics. Base station-initiated COTs have different idle period rules compared to UE-initiated COTs, allowing optimized interference management for each local context while maintaining overall spectrum efficiency.
Data Source
AI summary
Systems and methods are disclosed that relate to transmission by a radio node having an opportunity to use any of multiple Channel Occupancy Times (COTs). In one embodiment, a method performed by a radio node comprises determining, for a particular transmission, that the radio node has an opportunity to use either of two COTs consisting of a base station initiated COT and a wireless device initiated COT. The method further comprises, responsive to determining that the radio node has an opportunity to use either of the two COTs, selecting) a particular COT from among the two COTs to be used for the particular transmission. The method further comprises determining that an idle period associated to the particular COT is a valid idle period in which no transmissions to or from the radio node are to occur.