Adaptive Channel Assessment for Hidden Node Interference
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Solution Overview
Problem
The existing Listen Before Talk (LBT) technology in 5G NR-U systems fails to account for the hidden node problem, leading to inefficient channel assessment and interference between communication systems, resulting in reduced spectrum utilization and communication efficiency.
Innovation Solution
A channel assessment method that dynamically adjusts channel assessment based on interference conditions between communication systems, allowing for adaptive channel assessment and resource allocation, thereby improving communication quality and spectrum utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel assessment is performed frequently in shared spectrum to ensure fair coexistence, then interference between communication systems is reduced, but spectrum utilization efficiency deteriorates
Solution Approach 1:
The patent implements dynamic channel assessment by adjusting the assessment frequency based on detected interference levels. When interference is detected, channel assessment is performed more frequently to ensure fair coexistence. When no interference is detected, the assessment frequency is reduced to improve spectrum utilization. This dynamic adjustment resolves the contradiction between maintaining reliability through frequent assessment and improving productivity by reducing unnecessary assessments.
2Ease of operation
If Listen Before Talk (LBT) technology is used in 5G NR-U systems, then channel access is improved, but hidden node problem causes interference between communication systems
Solution Approach 1:
The patent introduces an interference detection mechanism as an intermediary between LBT channel access and actual transmission. The system first performs LBT to gain channel access, then detects actual interference conditions before transmitting. This intermediary detection step identifies hidden node interference that LBT alone cannot detect, allowing the system to adjust transmission parameters or avoid transmission when interference is present, thus resolving the contradiction between ease of channel access and prevention of harmful interference.
3Measurement precision
If channel assessment frequency is increased to account for hidden node problem, then interference detection is improved, but communication efficiency deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of channel assessment frequency based on detected interference conditions. When hidden node interference is detected, the system increases assessment frequency to improve measurement precision and accurately track interference levels. When no interference is detected, the system reduces assessment frequency to minimize impact on communication efficiency. This dynamic approach resolves the contradiction between improving measurement precision and maintaining productivity.
Data Source
AI summary
A channel assessment method includes: performing channel assessment in a shared spectrum, and alternatively, determining a channel resource occupied in the shared spectrum according to an interference condition between communication systems.