PSFCH Coverage Extension via Time-Frequency Repetitions
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in achieving better signal strength and success rate for physical sidelink feedback channel (PSFCH) transmissions, especially in the 6 GHz frequency band.
Innovation Solution
The proposed solution involves transmitting a physical sidelink feedback channel (PSFCH) that spans multiple symbols in the time domain, includes a set of repetitions in the frequency domain, or spans more than one resource block (RB), thereby enhancing signal strength and success rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PSFCH transmission uses traditional single-symbol format, then device complexity is low, but signal strength and success rate are insufficient
Solution Approach 1:
The PSFCH transmission is segmented into multiple repetitions across different time symbols and frequency resource blocks. Each repetition transmits the same feedback information independently, allowing the receiving device to combine these segments through signal processing to improve the overall signal strength and transmission reliability without requiring a completely new transmission protocol.
Solution Approach 2:
The patent extends the PSFCH transmission from a single time symbol to multiple time symbols, and from a single frequency resource block to multiple frequency resource blocks. This dimensional expansion in both time and frequency domains provides additional transmission opportunities and spatial diversity, thereby improving signal strength and reliability while maintaining compatibility with existing device architectures.
2Strength
If PSFCH spans multiple symbols and resource blocks, then signal strength improves, but time and frequency resources are consumed
Solution Approach 1:
Multiple PSFCH repetitions are merged across different time symbols and frequency resource blocks to construct a single robust feedback transmission. The receiving device combines the energy and information from all repetitions through coherent or non-coherent detection, achieving signal strength enhancement equivalent to using a single large transmission, but distributed across multiple smaller resource units.
Solution Approach 2:
The PSFCH transmission employs periodic repetitions where the same feedback information is transmitted at regular intervals across multiple symbols and resource blocks. This periodic structure allows the receiving device to accumulate signal energy over time and frequency, improving the signal-to-noise ratio while the periodic pattern enables efficient resource utilization by avoiding redundant transmissions in the same time-frequency slot.
Data Source
AI summary
Methods, apparatuses, and computer-readable medium for sidelink communications may be provided. An example method may include receiving, from a second UE, a sidelink communication. The example method may include transmitting, to the second UE based on the sidelink communication, a physical sidelink feedback channel (PSFCH), the PSFCH spanning multiple symbols in a time domain, including a set of repetitions in a frequency domain, or spanning more than one resource blocks (RBs).