Long PSFCH Resource Mapping for V2X HARQ Feedback
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Solution Overview
Problem
The existing static PSFCH format in NR sidelink communications is insufficient to accommodate various types of networking and can cause fragmentation and collision of retransmissions, lacking adaptability for different UE scenarios.
Innovation Solution
Implement a configurable 'long' PSFCH format that utilizes unused physical resource blocks from the PSCCH and PSSCH resource pool, allowing for adaptive resource mapping and indexing to accommodate multiple transport blocks, enhancing ACK/NACK messaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a static PSFCH format is used in NR sidelink communications, then the system structure is simple, but it is insufficient to accommodate various types of networking and causes fragmentation and collision of retransmissions
Solution Approach 1:
The patent introduces a configurable PSFCH format that can dynamically switch between short and long formats based on the number of transport blocks. This dynamic adaptability allows the system to accommodate various networking types (unicast, groupcast, broadcast) without requiring a completely complex structure, as the format adjusts only when needed.
Solution Approach 2:
The invention changes the parameter of PSFCH duration (short vs. long format) to adapt to different networking scenarios. By modifying this single parameter based on the number of transport blocks, the system achieves versatility across different networking types while maintaining structural simplicity when the short format suffices.
2Reliability
If a static PSFCH format is used, then the configuration is simple, but retransmission collisions occur due to insufficient resource allocation
Solution Approach 1:
The patent implements dynamic resource allocation where the PSFCH format (short or long) is selected based on the number of transport blocks. This dynamic approach prevents retransmission collisions by ensuring sufficient resources are allocated when multiple transport blocks are present, while avoiding unnecessary complexity when a single transport block is transmitted.
Solution Approach 2:
The invention segments the PSFCH resources into short and long formats, with each segment optimized for specific scenarios. The short format handles simple cases efficiently, while the long format provides expanded resources for complex scenarios with multiple transport blocks, thereby preventing collisions without over-provisioning resources in all cases.
3Adaptability or versatility
If a long PSFCH format is implemented to accommodate multiple transport blocks, then adaptability improves, but resource overhead increases
Solution Approach 1:
The patent employs dynamic format selection where the long PSFCH format is activated only when the number of transport blocks exceeds one. This dynamic approach provides the necessary adaptability to support multiple transport blocks while avoiding the resource overhead of using the long format universally, thus optimizing resource block usage.
Solution Approach 2:
The invention changes the PSFCH duration parameter from short to long format based on the number of transport blocks. This parameter change enables support for multiple transport blocks only when necessary, preventing unnecessary resource consumption in scenarios where a single transport block is transmitted, thereby balancing adaptability with resource efficiency.
Data Source
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AI summary
Embodiments are presented herein of apparatuses, systems, and methods for performing vehicle-to-everything (V2X) sidelink communications with hybrid automatic repeat request (HARQ) feedback include using a new long physical sidelink feedback channel (PFSCH) format, i.e., PFSCH format 1, to assign feedback resources for various sidelink communication networks and environments where the existing or legacy sidelink feedback format, i.e., the short PFSCH format, referred to herein as PFSCH format 0, is insufficient to support effective acknowledgements (ACKs) and non-acknowledgements (NACKs) due to the limited nature of the format design.