PSFCH Resource Mapping in Unlicensed Spectrum
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Solution Overview
Problem
Current wireless communication networks face challenges in efficiently mapping physical sidelink shared channel (PSSCH) or physical sidelink control channel (PSCCH) resources to physical sidelink feedback channel (PSFCH) resources in the unlicensed spectrum, particularly in ensuring accurate ACK/NACK feedback transmission.
Innovation Solution
The proposed solution involves determining a mapping that specifies a set of candidate PSFCH resource blocks for each PSSCH or PSCCH transmission, including a common interlace and dedicated resource blocks, allowing the transmitting UE to monitor the correct PSFCH resource for feedback and the receiving UE to transmit ACK/NACK responses accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple candidate PSFCH occasions are provided for a single PSSCH/PSCCH transmission, then feedback reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The PSFCH resources are segmented into multiple candidate occasions distributed across different resource block sets. Each PSSCH/PSCCH transmission is mapped to a specific candidate PSFCH occasion based on predetermined rules, dividing the feedback resource space into manageable segments that reduce allocation complexity while maintaining reliability through multiple options.
Solution Approach 2:
The mapping between PSSCH/PSCCH and candidate PSFCH occasions is predetermined and configured in advance. This preliminary establishment of mapping relationships eliminates the need for complex real-time resource allocation decisions, reducing device complexity while ensuring reliable feedback transmission through pre-planned resource assignments.
2Productivity
If PSFCH resources are distributed across multiple resource block sets, then resource utilization efficiency is improved, but mapping complexity increases
Solution Approach 1:
The system dynamically selects which resource block set to use for PSFCH transmission based on the mapping rules and available resources. This dynamic adaptation allows efficient utilization of distributed resources across multiple resource block sets while managing mapping complexity through structured selection criteria that adapt to current system conditions.
Solution Approach 2:
The mapping parameters between PSSCH/PSCCH and PSFCH resources are configured to change based on the resource block set assignments. By adjusting mapping parameters such as offset values and resource block indices, the system achieves efficient resource utilization across multiple sets while keeping the mapping process manageable through parameter-based control.
3Reliability
If dedicated PRBs are allocated for PSFCH transmissions, then feedback transmission reliability is improved, but available resources for other channels are reduced
Solution Approach 1:
The dedicated PRBs allocated for PSFCH transmissions serve multiple functions: they provide reliable feedback transmission while also being part of the overall resource pool that can be dynamically shared with other channels when not in use. This multi-functionality allows the same resources to support both dedicated feedback transmission and general data communication, mitigating the reduction in available resources for other channels.
Data Source
AI summary
Systems and methods are configured for receiving configuration data specifying a mapping for physical sidelink shared channel (PSSCH) or physical sidelink control channel (PSCCH) resource blocks to respective candidate physical sidelink feedback channel (PSFCH) resource blocks, the mapping specifying, for a PSSCH or PSCCH transmission, a set of candidate PSFCH resource blocks, the set of candidate PSFCH resource blocks including a common interlace resource block and a set of dedicated resource blocks for PSFCH transmissions; transmitting the PSSCH or PSCCH transmission; and receiving, based on the mapping, a PSFCH transmission from a user equipment (UE), the PSFCH transmission being transmitted using a PSFCH resource block of the set of candidate PSFCH resource blocks.