Sidelink Feedback Channel Mapping Across Multiple LBT RB Sets
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Solution Overview
Problem
In the newly-operated frequency band with higher frequencies, the unlicensed band requires specific regulations for device-to-device direct communication, particularly in managing the association between physical sidelink control and feedback channels using multiple listen before talk (LBT) channels.
Innovation Solution
A terminal is equipped with a reception unit for performing LBT in a resource pool with multiple RB sets, determining channels for receiving feedback information, and a transmission unit for transmitting signals upon successful LBT, facilitating feedback channel transmission in an unlicensed band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple LBT channels are used for D2D communication in unlicensed band, then channel access reliability is improved, but channel association complexity increases
Solution Approach 1:
The resource pool is divided into multiple RB sets, each associated with a specific LBT channel. This segmentation allows the system to manage multiple channels independently while maintaining clear associations between resources and channels, thus improving reliability without excessive complexity
Solution Approach 2:
The association between PSCCH/PSSCH and PSFCH channels is predetermined and configured in advance. This preliminary association setup eliminates the need for dynamic channel pairing during operation, reducing real-time complexity while ensuring reliable channel access
2Adaptability or versatility
If LBT procedure is performed in unlicensed band, then regulatory compliance is improved, but communication latency increases
Solution Approach 1:
The LBT procedure is performed periodically at scheduled intervals before transmissions. This periodic approach ensures regulatory compliance is maintained systematically while allowing the system to predict and optimize timing, reducing overall latency impact
Solution Approach 2:
Channel access is checked in advance before actual data transmission begins. This preliminary LBT check ensures compliance with unlicensed band regulations while allowing the system to prepare transmission resources ahead of time, minimizing latency during actual communication
Data Source
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AI summary
A terminal includes a reception unit configured to perform listen before talk (LBT) corresponding to a transmission signal in a resource pool including a plurality of resource block (RB) sets in an unlicensed band; a control unit configured to determine a channel in each of the plurality of RB sets based on a resource of the transmission signal, the channel being for receiving feedback information corresponding to the transmission signal from another terminal; and a transmission unit configured to transmit the transmission signal to the another terminal in a case where the LBT is successful. The reception unit receives, on the channel, the feedback information corresponding to the transmission signal from the another terminal.