Autonomous HARQ Process ID Determination in Sidelink Communication
Solution Overview
Problem
Current communication technologies for Vehicle to Everything (V2X) lack a method to determine a Sidelink (SL) Hybrid Automatic Repeat Request (HARQ) process identifier, which is essential for efficient data transmission and retransmission.
Innovation Solution
A communication method where a first terminal determines the HARQ process ID associated with a sidelink grant and sends this information to a second terminal through a sidelink, allowing autonomous determination of the HARQ process ID without network device intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a terminal autonomously determines the HARQ process ID without network device intervention, then the transmission efficiency and resource utilization are improved, but the complexity of terminal processing increases
Solution Approach 1:
The terminal autonomously determines the HARQ process ID by itself without requiring network device assignment or intervention. The terminal uses internal algorithms (such as based on time domain resource index, frequency domain resource index, or redundancy version) to self-determine the HARQ process ID, thereby reducing network signaling overhead and improving transmission efficiency while accepting increased terminal processing complexity
Solution Approach 2:
The patent changes the parameter determination method from network-assigned to terminal-calculated. By using different parameters (time domain resource index, frequency domain resource index, redundancy version) to calculate the HARQ process ID, the system achieves autonomous determination while managing terminal processing complexity through standardized calculation formulas
2Device complexity
If the HARQ process ID is determined by network device assignment, then the terminal processing complexity is reduced, but the transmission latency increases due to network intervention
Solution Approach 1:
The terminal performs self-service by autonomously determining the HARQ process ID without waiting for network device assignment. This eliminates the signaling delay between terminal and network device, directly reducing transmission latency while the terminal handles the processing complexity through standardized calculation methods
Solution Approach 2:
The terminal determines the HARQ process ID in advance as part of the grant reception process, before actual data transmission begins. By preliminarily determining the HARQ process ID based on grant parameters, the system avoids delays during the transmission phase, thereby reducing overall transmission latency
3Productivity
If more HARQ processes are supported on one carrier, then the data transmission capacity is improved, but the number of bits required for HARQ process identifier increases
Solution Approach 1:
The patent uses the redundancy version (RV) parameter in combination with other grant parameters to determine the HARQ process ID. By leveraging the RV field that already exists in the grant information, the system can support multiple HARQ processes without requiring additional bits, thereby maintaining data transmission capacity while avoiding information loss in the identifier
Data Source
AI summary
A communication method and an apparatus, the method including determining, by a first terminal, first hybrid automatic repeat request (HARQ) information associated with a first sidelink grant, where the first sidelink grant is associated with carrying data between the first terminal and a second terminal, and where the first HARQ information comprises a first HARQ process identifier associated with the first sidelink grant, and sending, by the first terminal, the first HARQ information to the second terminal through a sidelink, where the sidelink is a direct wireless communication link between the first terminal and the second terminal.