PSFCH Resource Configuration for Sidelink Feedback Control
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Solution Overview
Problem
The 5G new radio system lacks a method for feeding back control information on a sidelink, which is essential for efficient communication between user equipment (UE) devices.
Innovation Solution
A feedback control channel configuration method is introduced to configure a candidate time-frequency resource for a physical sidelink feedback control channel (PSFCH) that carries feedback control information, allowing UE devices to send and receive HARQ-ACK/NACK information and channel state measurement information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feedback control information is transmitted on sidelink without dedicated channel configuration, then communication functionality is simplified, but communication efficiency deteriorates due to lack of optimized resource allocation
Solution Approach 1:
The patent applies universality by enabling user equipment to autonomously determine PSFCH resource pools using standardized formulas based on common parameters (slot index, subcarrier spacing, cyclic prefix length) that are already configured for sidelink communication. This multi-functional approach allows the same configuration parameters to serve both data transmission and feedback control purposes, achieving optimized resource allocation without adding dedicated configuration complexity.
Solution Approach 2:
The patent implements self-service by allowing user equipment to autonomously calculate and determine PSFCH time-frequency resources without network configuration or manual intervention. The UE uses predefined formulas and existing communication parameters to self-determine the feedback channel resources, eliminating the need for complex dedicated configuration while maintaining communication efficiency.
2Productivity
If dedicated PSFCH channel configuration is implemented, then resource utilization is optimized, but signaling overhead increases due to additional configuration information
Solution Approach 1:
The patent eliminates signaling overhead by enabling user equipment to autonomously determine PSFCH resources using self-service mechanisms. The UE calculates time-frequency resources based on predefined formulas and existing communication parameters without requiring additional network configuration signaling, thus optimizing resource utilization while avoiding extra signaling overhead.
Solution Approach 2:
The patent uses copying by reusing existing sidelink configuration parameters (slot index, subcarrier spacing, cyclic prefix length) for PSFCH resource determination. Instead of creating dedicated configuration signals, the system copies and repurposes already-configured parameters for feedback channel allocation, achieving optimized resource utilization without additional signaling.
3Reliability
If PSFCH resources are allocated without systematic determination method, then implementation is simpler, but feedback reliability deteriorates due to resource conflicts and interference
Solution Approach 1:
The patent applies preliminary action by establishing systematic PSFCH resource determination formulas before actual feedback transmission occurs. The time-frequency resources are pre-calculated based on slot index, subcarrier spacing, and cyclic prefix length, ensuring conflict-free allocation is determined in advance rather than negotiated dynamically, thus improving feedback reliability without adding operational complexity.
Solution Approach 2:
The patent uses parameter changes by systematically varying PSFCH resource allocation based on communication parameters such as slot index, subcarrier spacing, and cyclic prefix length. These parameter-based adjustments ensure that feedback resources are systematically differentiated across different transmission conditions, improving feedback reliability through structured resource separation while maintaining implementation simplicity.
Data Source
AI summary
Embodiments of this application provide a feedback control channel configuration method and a device, and relate to the field of wireless communication. A candidate time-frequency resource may be configured for a physical sidelink feedback control channel (PSFCH) that carries feedback control information, so that the required feedback control information can be fed back on the PSFCH. The method includes: determining, by first user equipment, configuration information of a PSFCH, where the configuration information of the PSFCH is to indicate or configure a candidate time-frequency resource of the PSFCH, and the candidate time-frequency resource of the PSFCH is to the carry feedback control information of first information; and sending, by the first user equipment, the configuration information of the PSFCH to second user equipment.