Sidelink Feedback Channel Interlacing for Unlicensed Band OCB
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Solution Overview
Problem
In newly-operated frequency bands with higher frequencies, the conventional Physical Sidelink Feedback Channel (PSFCH) format of one PRB may not satisfy Occupied Channel Bandwidth (OCB) requirements in unlicensed bands, necessitating an adaptation of device-to-device direct communications to comply with regulations.
Innovation Solution
A terminal is equipped with a reception unit for Listen Before Talk (LBT) in the unlicensed band, a control unit to determine a channel with an interlace structure for receiving feedback information, and a transmission unit to transmit signals upon successful LBT, ensuring compliance with unlicensed band regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional PSFCH format of one PRB is used, then the feedback channel can be transmitted, but the OCB requirements in unlicensed bands are not satisfied
Solution Approach 1:
The patent divides the feedback channel transmission into multiple PRBs (Physical Resource Blocks) instead of using a single PRB. The PSFCH is segmented across multiple PRBs within a resource pool, allowing the system to satisfy the Occupied Channel Bandwidth (OCB) requirements of unlicensed bands while maintaining feedback transmission functionality. This segmentation approach resolves the contradiction by expanding the channel footprint without adding complex modulation or coding schemes.
2Reliability
If LBT is performed for channel access in unlicensed band, then regulations are satisfied, but transmission delay increases
Solution Approach 1:
The patent implements a resource pool configuration where LBT is performed in advance before actual data transmission. The terminal performs LBT to acquire the channel, and once successful, the allocated resources can be used for feedback transmission without requiring repeated LBT procedures. This preliminary channel acquisition action reduces transmission delay while ensuring regulation compliance, as the LBT is completed before the critical feedback transmission window.
3Ease of manufacture
If feedback channel uses conventional PSFCH format, then implementation is simple, but it cannot meet OCB requirements in unlicensed bands
Solution Approach 1:
The patent introduces dynamic resource pool configuration where the PSFCH can be allocated across variable numbers of PRBs depending on the specific unlicensed band requirements. The resource pool size and PSFCH distribution can be dynamically adjusted to meet different OCB requirements while maintaining a relatively simple implementation framework. This dynamic adaptability allows the system to accommodate various unlicensed band regulations without requiring completely new feedback mechanisms.
Data Source
AI summary
A terminal includes: a reception unit configured to perform an LBT (Listen before talk) for a transmission signal in an unlicensed band; a control unit configured to determine a channel to which an interlace structure is applied, the channel being used for receiving, from another terminal, feedback information corresponding to the transmission signal; 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, from the another terminal, the feedback information corresponding to the transmission signal by using the channel.