RAN Node Coordination for Unlicensed Spectrum Load Metrics
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Solution Overview
Problem
In unlicensed spectrum, existing solutions for setting the energy detection (ED) threshold are suboptimal due to lack of communication between neighboring nodes, leading to inefficient channel occupancy and interference, and existing load balancing metrics do not accurately reflect resource availability in New Radio (NR-U) systems.
Innovation Solution
Implement a method where RAN nodes exchange load metrics and LBT configuration information to determine shared channel availability and optimize channel occupancy, allowing for coordinated deployment and accurate resource management in NR-U systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RAN nodes operate independently in unlicensed spectrum without communication, then device complexity is reduced, but channel occupancy efficiency deteriorates and interference increases
Solution Approach 1:
The patent introduces a coordination mechanism where RAN nodes exchange LBT configuration information and load metrics through an intermediary communication interface. This mediator enables cooperative channel access decisions, improving channel occupancy efficiency while managing complexity through standardized information exchange protocols.
Solution Approach 2:
The patent implements feedback loops where RAN nodes share load metrics and channel occupancy information with neighboring nodes. This feedback mechanism allows nodes to adapt their LBT parameters based on observed channel conditions and neighbor behavior, resolving the contradiction between independent operation and coordinated efficiency.
2Measurement precision
If existing load balancing metrics are used in NR-U systems, then implementation simplicity is maintained, but measurement precision deteriorates due to inaccurate resource availability reflection
Solution Approach 1:
The patent modifies load balancing metrics by incorporating LBT configuration parameters and channel occupancy measurements specific to unlicensed spectrum. This parameter adaptation enables accurate resource availability measurement in NR-U systems while maintaining a systematic approach to metric calculation.
Solution Approach 2:
The patent segments the load metric calculation into distinct components: LBT configuration parameters, channel occupancy measurements, and neighbor node load information. This segmentation allows precise measurement of resource availability while managing complexity through modular metric computation.
3Reliability
If energy detection threshold is set without neighbor node information, then decision speed is improved, but reliability deteriorates due to suboptimal threshold selection
Solution Approach 1:
The patent implements preliminary exchange of LBT configuration information between neighbor nodes before actual channel access decisions. This preliminary action allows nodes to pre-coordinate threshold settings based on neighbor configurations, improving reliability without significant time loss through efficient information sharing.
Data Source
AI summary
In certain embodiments, a method performed by a first radio access network (RAN) node comprises receiving, from a second RAN node, load metrics associated with a shared channel and listen-before-talk (LBT) configuration information. The LBT configuration information indicates how a determination is made whether the shared channel is occupied or available for communication between the second RAN node and a wireless device. The method further comprises performing one or more operations of the first RAN node based at least in part on the load metrics and the LBT configuration information received from the second RAN node.