Energy Detection Threshold Determination for Wireless LBT
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Solution Overview
Problem
Existing methods cannot accurately determine the energy detection (ED) threshold actually used by a terminal during the listen before talk (LBT) process in wireless communication systems, making it difficult for network devices to determine the appropriate transmission mode.
Innovation Solution
The proposed solution involves determining a second ED threshold that is used by the terminal for LBT before uplink transmission, which can be equal to or different from the first ED threshold configured by the network device. This allows the network device and the terminal to agree on the ED threshold used during LBT.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station configures the ED threshold for the terminal, then the terminal can perform LBT to determine channel idle/busy state, but the base station cannot determine whether the ED threshold actually used by the terminal is the configured threshold
Solution Approach 1:
The terminal feeds back information about the actual ED threshold used during LBT to the base station. This feedback mechanism allows the base station to determine whether the terminal used the configured ED threshold or a different threshold, resolving the information asymmetry problem while maintaining the original threshold configuration capability.
Solution Approach 2:
The base station pre-configures the ED threshold for the terminal before the terminal performs LBT. This preliminary configuration ensures the terminal has a reference threshold to use, while the subsequent feedback mechanism verifies whether this pre-configured threshold was actually applied, enabling both proactive threshold setting and retroactive verification.
2Adaptability or versatility
If the terminal uses a different ED threshold than configured, then the terminal may adapt to actual channel conditions, but the base station cannot accurately determine the transmission mode
Solution Approach 1:
The terminal provides feedback information to the base station indicating the actual ED threshold used during LBT. This feedback enables the base station to reliably determine the transmission mode by knowing the actual threshold value, while the terminal retains the flexibility to use either the configured threshold or a different threshold based on actual channel conditions.
Solution Approach 2:
The ED threshold system becomes dynamic, allowing the terminal to adjust the threshold based on actual channel conditions while the base station maintains awareness of the actual threshold used through feedback. This dynamic adaptation improves versatility while the feedback mechanism preserves reliability for transmission mode determination.
Data Source
AI summary
The present application relates to the field of wireless communications. Provided are an energy detection (ED) threshold value determination method and apparatus. The method comprises: receiving a first ED threshold value configured by a network device; and determining a second ED threshold value, the second ED threshold value being used for performing listen before talk (LBT) before uplink transmission, and the second ED threshold value being equal to or not equal to the first ED threshold value. An ED threshold value actually used during LBT before the uplink transmission can be determined, so that the network device and a terminal can reach an agreement on the ED threshold value actually used by the terminal during LBT, and the network device can determine, according to the second ED threshold value, a transmission mode for transmitting data to the terminal.