Sidelink HARQ Feedback Using PSFCH Resource Allocation
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Solution Overview
Problem
In sidelink communication, unnecessary retransmissions occur due to the lack of HARQ information feedback, leading to resource wastage when the HARQ feedback attribute is disabled, and there is no associated PSFCH resource configured for the grant.
Innovation Solution
A terminal device requests another terminal device to perform HARQ feedback or requests the network to allocate a PSFCH resource when the HARQ feedback attribute is enabled but not configured, thereby avoiding unnecessary retransmissions and resource waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the HARQ feedback attribute is disabled and no PSFCH resource is configured, then the device complexity is reduced and resource configuration is simplified, but unnecessary retransmissions occur and resources are wasted
Solution Approach 1:
The patent dynamically adjusts the HARQ feedback attribute based on the presence of PSFCH resources. When PSFCH resources are configured, the HARQ feedback attribute is enabled; when not configured, it is disabled. This dynamic adaptation prevents unnecessary retransmissions while maintaining proper HARQ functionality when resources are available, thereby resolving the contradiction between configuration simplicity and resource efficiency.
Solution Approach 2:
The patent changes the HARQ feedback attribute parameter based on the PSFCH resource configuration status. By modifying this parameter dynamically according to resource availability, the system avoids unnecessary retransmissions (reducing resource waste) while maintaining appropriate HARQ feedback behavior when resources are present, thus resolving the technical contradiction.
2Reliability
If the HARQ feedback attribute is enabled without PSFCH resource configuration, then HARQ feedback functionality is improved, but resource conflict and system reliability deteriorate
Solution Approach 1:
The patent applies preliminary anti-action by checking whether PSFCH resources are configured before enabling the HARQ feedback attribute. This preventive measure avoids the harmful situation where HARQ feedback is enabled without corresponding resources, which would cause resource conflicts and transmission failures. By performing this check in advance, the system maintains HARQ reliability only when resources are properly available.
Solution Approach 2:
The patent establishes a feedback mechanism where the PSFCH resource configuration status determines the HARQ feedback attribute setting. This feedback loop ensures that HARQ feedback functionality is enabled only when the necessary PSFCH resources are configured, preventing resource conflicts and ensuring system reliability. The system continuously monitors resource availability and adjusts HARQ behavior accordingly.
3Reliability
If PSFCH resources are always configured for all grants, then HARQ feedback reliability is improved, but resource allocation complexity and overhead increase
Solution Approach 1:
The patent applies local quality by configuring PSFCH resources selectively for specific grants rather than universally for all grants. Each grant is evaluated individually to determine whether PSFCH resources should be allocated based on specific requirements. This localized approach maintains HARQ feedback reliability where needed while avoiding unnecessary resource allocation complexity and overhead in cases where HARQ feedback is not required.
Solution Approach 2:
The patent implements partial action by enabling HARQ feedback with PSFCH resource configuration only for those grants that require it, rather than applying the configuration universally. This selective approach ensures HARQ reliability for critical transmissions while avoiding the excessive resource allocation complexity that would result from configuring PSFCH resources for all grants regardless of need.
Data Source
AI summary
In an embodiment a sidelink communication method includes when a hybrid automatic repeat request (HARQ) feedback attribute of at least one sidelink logical channel of a first terminal device is enabled, obtaining, by the first terminal device from a network side device, one or more resource pools for the first terminal device, wherein a physical sidelink feedback channel (PSFCH) resource is configured in at least one of the resource pools.