HARQ Process Management for V2X Communication Systems
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Solution Overview
Problem
Existing HARQ process management methods for UEs cannot adapt to varied SCI forms, leading to inefficiencies in data transmission and potential packet loss due to limited HARQ process allocation and lack of effective management in V2X communication systems.
Innovation Solution
A method for managing HARQ processes by receiving SCI, determining whether it indicates a HARQ process identity, and associating the correct HARQ process for data transmission, including the use of stop-and-wait protocols and idle HARQ process allocation, to optimize data reception and transmission in V2X communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If HARQ process identity information is not included in SCI, then resource utilization is improved through simplified signaling, but HARQ process management becomes difficult leading to packet loss
Solution Approach 1:
The patent segments SCI into multiple types (first type without HARQ process identity, second type with HARQ process identity) based on different transmission scenarios. This segmentation allows the system to use simplified signaling when possible while maintaining reliable HARQ management when needed, resolving the contradiction between signaling overhead and HARQ process management reliability.
Solution Approach 2:
The patent dynamically determines whether to include HARQ process identity information in SCI based on the specific transmission scenario, UE capability, and network configuration. This dynamic approach allows the system to adapt between simplified and detailed signaling modes, optimizing both resource utilization and HARQ management reliability according to actual needs.
2Reliability
If multiple retransmissions are allowed in V2X communication, then data transmission reliability is improved, but resource allocation complexity increases due to varied SCI forms
Solution Approach 1:
The patent creates a universal HARQ management mechanism that can handle multiple SCI forms (with and without HARQ process identity) through a unified approach. The receiving UE uses the same HARQ process association logic regardless of SCI type, and the system maintains backward compatibility with both first-type and second-type SCI forms, reducing management complexity while supporting multiple retransmissions for improved reliability.
3Device complexity
If HARQ process allocation is limited in V2X communication, then device complexity is reduced, but data transmission efficiency deteriorates due to insufficient process availability
Solution Approach 1:
The patent enables receiving UEs to autonomously determine HARQ process association based on SCI content and local configuration, without requiring complex centralized allocation. The system self-manages HARQ process assignment by interpreting SCI indicators and mapping to available processes, reducing allocation complexity while maintaining efficient utilization of limited HARQ processes through intelligent local decision-making.
Data Source
AI summary
An HARQ process management method and apparatus, a terminal, and a storage medium are provided. The HARQ process management method includes: receiving SCI; determining whether the SCI indicates a HARQ process identity to obtain a first determination result and determining a HARQ process associated with the SCI based on the first determination result.