Sidelink HARQ-ACK Multiplexing for PSFCH Conflict Avoidance
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Solution Overview
Problem
In wireless communication systems, particularly in NR V2X, conflicts among Physical Sidelink Feedback Channels (PSFCHs) lead to resource wastage and lack of HARQ-ACK information due to multiplexing of multiple PSFCHs targeting the same node, which is not adequately addressed by existing technologies.
Innovation Solution
A method and device for wireless communications that establish a correspondence between time-frequency resource combinations occupied by data channels and feedback channels, enabling orthogonal time-frequency units for multiplexing HARQ-ACK information, thereby optimizing resource utilization and avoiding conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PSFCHs are multiplexed onto a same PSFCH to prevent resource waste, then resource utilization improves, but conflicts in time domain occur leading to loss of HARQ-ACK information
Solution Approach 1:
The patent segments the feedback channel resources by introducing time-frequency unit groups where any two units are orthogonal in time domain. This segmentation allows multiple PSFCHs to be multiplexed without conflict by assigning them to different orthogonal time-frequency units within the same resource pool, thus preventing information loss while improving resource utilization.
2Device complexity
If PSFCH resources are configured periodically or pre-configured, then system complexity is reduced, but flexibility in handling multiple PSFCH multiplexing scenarios is limited
Solution Approach 1:
The patent introduces a dynamic mechanism where a time-frequency unit group is selected based on the time-frequency resource occupied by the data channel. This allows the system to adaptively choose appropriate feedback resources for different multiplexing scenarios while maintaining relatively simple periodic or pre-configured resource pools, thus balancing complexity and flexibility.
3Ease of manufacture
If slots and sub-channels occupied by PSSCH are used to determine corresponding PSFCH resource, then resource allocation is simplified, but conflicts arise when multiple PSFCHs target the same node
Solution Approach 1:
The patent introduces time-frequency unit groups as an intermediary layer between the data channel resources and the feedback channel resources. Instead of directly mapping PSSCH slots and sub-channels to PSFCH resources (which causes conflicts), the mapping goes through the time-frequency unit group selection, which resolves conflicts by ensuring orthogonality in time domain while maintaining the simplicity of resource determination.
Data Source
AI summary
The present disclosure provides a method and a device in a node used for wireless communications. A first node receives a first signaling and a first signal in a first time-frequency resource block; and transmits a second information block in a first radio resource block. The first signaling comprises scheduling information for the first signal; the first signal carries a first bit block set; the second information block indicates whether the first bit block set is correctly received; the first radio resource block belongs to a first radio resource block group; the first time-frequency resource block is used to determine a first time-frequency unit. The above method realizes HARQ-ACK multiplexing in the sidelink, thus improving the resource utilization ratio on the feedback channel and streamlining the design of the feedback channel.