Downlink LBT Channel Sensing with Uplink Energy Subtraction
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Solution Overview
Problem
In full-duplex communication systems, the detection of channel energy during downlink LBT is inaccurate due to the inclusion of uplink transmission energy, leading to incorrect channel state determination and reduced spectrum utilization.
Innovation Solution
The method involves detecting both channel and uplink transmission energy within a monitoring period and subtracting the uplink transmission energy from the total channel energy to determine an accurate channel state, improving the accuracy of channel state determination and enhancing spectrum utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If downlink LBT detects channel energy including uplink transmission energy, then the detection covers all signals in the channel, but the channel state determination becomes inaccurate
Solution Approach 1:
The patent segments the total channel energy into two distinct components: downlink channel energy and uplink transmission energy. By separating these energy sources, the system can accurately determine the channel state for downlink transmission by excluding uplink energy from the detection, thereby resolving the measurement accuracy issue without excessive complexity
Solution Approach 2:
The patent introduces an intermediary mechanism (energy subtraction process) where the detected uplink transmission energy is subtracted from the total channel energy to obtain accurate downlink channel energy. This intermediary step enables precise channel state determination while maintaining manageable system complexity
2Productivity
If full-duplex communication is implemented on the same time-frequency resource, then spectrum utilization is greatly improved, but channel energy detection accuracy deteriorates
Solution Approach 1:
The patent extracts the uplink transmission energy component from the total channel energy detection. By taking out and separately measuring the uplink energy, the system can subtract it from the total to obtain accurate downlink channel energy, enabling full-duplex operation without compromising detection accuracy
Solution Approach 2:
The patent implements a feedback mechanism where the detected uplink transmission energy is fed back into the channel energy calculation process. This feedback allows the downlink LBT to compensate for the presence of uplink signals, maintaining measurement precision while enabling simultaneous full-duplex transmission
Data Source
AI summary
A method for downlink LBT is provided in the present disclosure. The method includes: detecting channel energy and uplink transmission energy within a monitoring period; determining a channel state within the monitoring period according to the channel energy and the uplink transmission energy; and performing downlink data transmission when the channel state is an idle state.