PSFCH Resource Association for V2X HARQ Feedback
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Solution Overview
Problem
In V2X systems, there is a misalignment between the PSFCH resources expected by transmitting users and those available to receiving users, leading to issues with HARQ feedback in the NR system.
Innovation Solution
A method is introduced to establish a correlation between time-frequency-resource blocks, allowing for effective scheduling and feedback transmission by indicating associations between resource blocks, thereby resolving resource misalignment between transmitting and receiving users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transmitting users and receiving users use different resource pools for SL transmission, then each user can independently select resources, but the PSFCH resources for transmitting users and receiving users become misaligned
Solution Approach 1:
The patent applies local quality by making the resource pool configuration user-specific. Each user is configured with a specific resource pool ID through RRC signaling, allowing transmitting and receiving users to have different resource pool configurations. This resolves the contradiction by enabling independent resource selection (adaptability) while the misalignment issue is addressed through the association mechanism between PSFCH resources and data resources.
Solution Approach 2:
The patent introduces an intermediary mechanism through the association relationship between PSFCH resources and data resources. The PSFCH resource is associated with the data resource through RRC configuration, acting as a mediator that connects the transmitting and receiving users' resource selections. This allows independent resource pool configuration while ensuring feedback reliability through the established association.
2Ease of operation
If SL resources are allocated independently to transmitting and receiving users, then resource allocation flexibility increases, but receiving users cannot generate HARQ feedback on expected PSFCH due to unavailable resources
Solution Approach 1:
The patent applies preliminary action by pre-configuring the association relationship between data resources and PSFCH resources through RRC signaling before actual transmission occurs. The receiving user is预先 configured with the PSFCH resource association information, so when data is received, the user can immediately identify the corresponding PSFCH resource for feedback without resource unavailability issues.
Solution Approach 2:
The patent implements a feedback mechanism where the receiving user generates HARQ feedback on the pre-associated PSFCH resource. The association relationship ensures that the PSFCH resource is available and correctly identified by the receiving user, enabling successful feedback generation. This resolves the productivity issue by ensuring the feedback path is established in advance.
3Reliability
If PSFCH resources are associated with data resources through RRC configuration, then resource alignment between transmitting and receiving users is achieved, but system complexity increases
Solution Approach 1:
The patent applies universality by using the existing RRC configuration mechanism for multiple purposes. The same RRC signaling infrastructure that configures data resources is also used to configure PSFCH resource associations. This multi-functional use of RRC configuration achieves resource alignment without requiring a separate complex configuration system, thus managing complexity while ensuring reliability.
Data Source
AI summary
The present disclosure discloses a method and a device in a node for wireless communication. The first node transmits first information; receives second information; transmits a first bit-block set on a first time-frequency-resource block; transmits or drops transmission of a third bit-block set on a third time-frequency-resource block; and receives a second signal on a fourth time-frequency-resource block; the first information is used for indicating that the fourth time-frequency-resource block is associated with the third time-frequency-resource block; the second information indicates that the fourth time-frequency-resource block is associated with the first time-frequency-resource block; the second signal is used for indicating whether a target bit-block set is correctly received; when the first node transmits the third bit-block set on the third time-frequency-resource block, the target bit-block set is the third bit-block set, otherwise the target bit-block set is the first bit-block set.