Sidelink Frequency Interlacing for Unlicensed Spectrum Access
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Solution Overview
Problem
Current sidelink communication systems face challenges in unlicensed spectrum, including channel access sensing procedures, TX/RX and RX/TX switching gaps, and mutual blocking among UEs, which affect data rate and reliability.
Innovation Solution
The proposed solution involves techniques to mitigate channel access sensing overhead, reduce switching gaps, and prevent mutual blocking by using cyclic prefix or postfix extensions, adjusting LBT procedures, and implementing frequency interlaced physical structures for sidelink communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Listen-Before-Talk (LBT) procedures are implemented for channel access sensing in unlicensed spectrum, then channel access reliability is improved, but LBT overhead increases and channel access time is extended
Solution Approach 1:
The patent applies preliminary action by performing channel access sensing on a subset of frequency interlaces before actual data transmission. This preliminary sensing allows the system to identify available frequency resources in advance, reducing the need for extensive LBT procedures during actual transmission and thereby reducing overall LBT overhead while maintaining reliable channel access.
Solution Approach 2:
The patent segments the frequency spectrum into multiple frequency interlaces, where each interlace consists of non-contiguous resource blocks. This segmentation allows parallel channel access attempts across different interlaces, reducing the time required for complete channel access sensing and transmission, thus addressing the LBT overhead issue while maintaining reliability.
2Reliability
If TX/RX and RX/TX switching gaps are implemented for full-duplex operation, then communication reliability is improved, but switching gap duration increases and reduces data rate
Solution Approach 1:
The patent segments frequency resources into frequency interlaces that enable spatial division multiplexing of TX and RX operations. By allocating different frequency interlaces for transmission and reception simultaneously, the system reduces the need for complete TX/RX switching, thereby reducing switching gap duration and increasing effective data rate while maintaining communication reliability through frequency isolation.
3Productivity
If frequency interlaced physical structure is implemented, then spectrum efficiency is improved and mutual interference is reduced, but system complexity increases
Solution Approach 1:
The patent implements frequency interlacing by segmenting the frequency spectrum into multiple interlaces with specific patterns of resource blocks. This segmentation approach improves spectrum efficiency by enabling non-contiguous resource allocation and reducing mutual interference through frequency diversity. The systematic pattern of interlace segmentation provides a manageable structure that balances the improvement in spectrum efficiency with acceptable system complexity.
Data Source
AI summary
Various embodiments herein provide techniques for sidelink communication, e.g., in an unlicensed frequency band. For example, embodiments may relate to channel access sensing procedures, e.g., in association with a listen-before-talk (LBT) procedure for unlicensed spectrum. Embodiments may further relate to a frequency interlaced physical structure for sidelink communication. Other embodiments may be described and claimed.