PUCCH Resource Mapping for HARQ Process ID Determination in Sidelink
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Solution Overview
Problem
In device-to-device (D2D) communication systems, particularly in Internet of Vehicles (IoV), it is challenging for network devices to determine the Hybrid Automatic Repeat Request (HARQ) process ID for sidelink data retransmissions when terminal devices operate in both network-configured and autonomously selected transmission modes, leading to difficulties in allocating retransmission resources effectively.
Innovation Solution
The communication method involves the terminal device sending a Physical Uplink Control Channel (PUCCH) to the network device, which carries information on the reception status of sidelink data, allowing the network device to determine the target HARQ process ID based on a preset correspondence between PUCCH transmission resources and HARQ process IDs, and subsequently sends retransmission resource information back to the terminal device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If terminal devices operate in both network-configured and autonomously selected transmission modes, then the flexibility and adaptability of D2D communication systems are improved, but the difficulty of determining HARQ process ID for retransmissions increases
Solution Approach 1:
The network device pre-configures multiple PUCCH resources for different HARQ process IDs before actual data transmission. When feedback is needed, the terminal device simply selects and uses the pre-configured PUCCH resource corresponding to its HARQ process ID, eliminating the need for real-time determination and reducing complexity.
Solution Approach 2:
The PUCCH resource acts as an intermediary that links the terminal device to the network device for feedback transmission. By using PUCCH resources as a mediator, the system establishes a clear mapping relationship between terminal devices and HARQ process IDs, simplifying the feedback mechanism in dual-mode operation.
2Reliability
If the network device allocates retransmission resources based on feedback information, then the reliability of communication systems is improved, but the time required for resource allocation and retransmission increases
Solution Approach 1:
The network device pre-allocates retransmission resources along with initial transmission resources. When the terminal device sends feedback indicating unsuccessful reception, the network device can immediately schedule retransmission using the pre-allocated resources, avoiding additional resource allocation delays and reducing overall retransmission time.
3Measurement precision
If multiple PUCCH resources are configured for different HARQ process IDs, then the accuracy of HARQ process identification is improved, but the quantity of signaling and resource configuration increases
Solution Approach 1:
Multiple PUCCH resources for different HARQ process IDs are merged into a unified resource pool configured by the network device. Instead of treating each HARQ process independently with separate signaling, the system combines them into a structured resource allocation framework, reducing overall signaling overhead while maintaining identification accuracy.
Data Source
AI summary
Provided in the present application are a communication method, a device, and a storage medium. The communication method comprises: a terminal device sends a PUCCH to a network device, the PUCCH bearing first information, and the first information being used to indicate the reception conditions of sidelink data sent by the terminal device; the network device determines a target HARQ process number according to the correlation between the PUCCH and the target HARQ process number; and the terminal device re-transmits the sidelink data according to the target HARQ process number.