Unlicensed-Band Full-Duplex Channel Access With Adaptive Thresholds
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively performing full-duplex communication in unlicensed bands, particularly in managing channel access procedures and configuring subbands or bandwidth parts for efficient communication.
Innovation Solution
The method involves transmitting system information to distinguish uplink and downlink resources, performing channel access procedures for multiple channels, and adjusting energy detection thresholds based on channel access success, allowing for adaptive configuration of communication directions and channel occupancy times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communication is performed in unlicensed band, then communication capacity and spectral efficiency are improved, but channel access complexity and interference management difficulty increase
Solution Approach 1:
The communication band is divided into multiple subbands, with different subbands allocated for uplink and downlink transmissions. This segmentation allows simultaneous full-duplex operation while managing interference through frequency separation, resolving the contradiction between communication capacity and channel access complexity
Solution Approach 2:
The base station dynamically adjusts energy detection thresholds based on channel access success in different channels. This dynamic adaptation enables the system to handle varying interference conditions in full-duplex mode, improving channel access efficiency while maintaining communication capacity
2Productivity
If channel access procedure is performed for multiple channels simultaneously, then resource utilization is improved, but detection and measurement difficulty increases
Solution Approach 1:
Different energy detection thresholds are applied to different channels based on their specific characteristics and interference conditions. This localized approach simplifies detection in each channel while achieving high overall resource utilization through multi-channel operation
Solution Approach 2:
The base station performs channel access procedures in advance for multiple channels before full-duplex transmission, determining which channels are available for uplink and downlink. This preliminary channel assessment simplifies subsequent detection operations during active transmission
3Productivity
If subband or bandwidth part is configured for FD-based communication, then communication efficiency is improved, but configuration complexity increases
Solution Approach 1:
The subband configuration mechanism serves multiple functions: it enables full-duplex operation, manages interference, and optimizes resource allocation simultaneously. This multi-functionality achieves high communication efficiency without proportionally increasing configuration complexity
4Measurement precision
If energy detection threshold is adaptively adjusted, then channel access accuracy is improved, but control complexity increases
Solution Approach 1:
The base station adjusts energy detection thresholds based on feedback from channel access success in different channels. This feedback-driven adaptation improves channel access accuracy while keeping control complexity manageable through automated threshold adjustment rather than manual configuration
Data Source
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AI summary
The present disclosure relates to performing full-duplex-based communication in an unlicensed band in a wireless communication system. A method for operating a base station may include transmitting system information including information related to a communication band, transmitting configuration information related to distinguishing an uplink resource and a downlink resource in the communication band, based on at least one of the system information or the configuration information, performing a first channel access procedure (CAP) for a first channel and a second channel included in the communication band, based on the first CAP being successful in the first channel, transmitting a signal in the first channel, and performing a second CAP for the second channel during transmission of the signal in the first channel.