PSFCH Mapping to Interlaced Resource Blocks for Unlicensed Band OCB
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Solution Overview
Problem
Current sidelink communication systems in unlicensed frequency bands fail to meet the Occupancy Channel Band (OCB) requirement, as the Physical Sidelink Feedback Channel (PSFCH) only occupies one physical resource block (PRB) in Release 16, which is insufficient for meeting the 80% bandwidth occupancy needed in unlicensed frequency bands.
Innovation Solution
The method involves mapping the PSFCH sequence to multiple interlaced resource blocks (IRBs) belonging to the same IRB index, allowing the PSFCH sequence to be transmitted across these IRBs, thereby meeting the OCB requirement and improving the availability of the unlicensed frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the PSFCH occupies only one physical resource block (PRB) as in Release 16, then the device complexity is reduced and implementation is simpler, but the bandwidth occupancy is insufficient to meet the 80% OCB requirement in unlicensed frequency bands
Solution Approach 1:
The PSFCH sequence is segmented and mapped to multiple interlaced resource blocks (IRBs) within the same interlace index, rather than occupying a single contiguous PRB. This segmentation allows the channel to achieve the required 80% bandwidth occupancy in unlicensed bands while maintaining structured resource allocation
Solution Approach 2:
The patent transitions from one-dimensional contiguous PRB allocation to multi-dimensional interlaced RB allocation across different frequency positions within the same interlace. This dimensional change enables achieving high bandwidth occupancy through distributed resource blocks rather than concentrated allocation
2Reliability
If the PSFCH is mapped to multiple interlaced resource blocks to meet OCB requirement, then the bandwidth occupancy is improved, but the resource allocation complexity and mapping overhead increase
Solution Approach 1:
The interlaced resource block mapping structure serves multiple functions simultaneously: it achieves the required 80% bandwidth occupancy for OCB compliance, provides frequency diversity for improved reliability, and maintains a standardized interlace structure that can be reused across different channel types and configurations, reducing overall system complexity
3Quantity of substance
If the PSFCH occupies more interlaced resource blocks, then the transmission bandwidth is increased to meet OCB requirement, but the available resources for other channels may be reduced
Solution Approach 1:
The patent applies local quality by allocating specific interlaced resource blocks with particular properties (same interlace index, distributed frequency positions) to the PSFCH based on the specific requirement of achieving 80% bandwidth occupancy, while leaving other resource blocks available for different channel types, thus optimizing local resource usage for the feedback channel without compromising overall system flexibility
Data Source
AI summary
A channel transmission method is performed by one or more receiving devices for a sidelink, and includes: in an unlicensed frequency band, for each of the one or more receiving devices, mapping a physical sidelink feedback channel (PSFCH) sequence transmitted by the receiving device to a plurality of interlaced physical resource blocks (IRBs), wherein the plurality of IRBs belong to a same IRB index; and transmitting, by the plurality of IRBs, the PSFCH sequence to a transmitting device for the sidelink.