Sidelink HARQ Reporting Offsets for Reliable Data Retransmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In vehicle-to-everything (V2X) communication, the timing for hybrid automatic repeat request (HARQ) information feedback on sidelinks is not specified, leading to difficulties in implementing effective data retransmission mechanisms, affecting reliability and efficiency of sidelink communication.
Innovation Solution
A method is provided to determine the timing for reporting sidelink HARQ information, ensuring the terminal device has sufficient time to prepare and report the information, allowing the network device to receive it accurately, thereby enabling effective data retransmission and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device schedules the terminal device to send sidelink data, then the terminal device can transmit data on the sidelink, but the timing for HARQ information feedback is not specified, causing uncertainty in retransmission scheduling
Solution Approach 1:
The patent applies preliminary action by pre-configuring HARQ timing parameters (k1, k2, k3) that define fixed time offsets between scheduling, data transmission, and feedback. This allows the terminal device to prepare and report HARQ information at predetermined times without waiting for dynamic scheduling, thereby eliminating timing uncertainty and ensuring reliable retransmission mechanisms.
2Productivity
If the terminal device reports HARQ information to the network device, then the network device can schedule retransmissions, but the terminal device needs sufficient processing time to prepare the feedback
Solution Approach 1:
The patent ensures the terminal device has sufficient processing time by pre-defining the timing relationship between data reception and HARQ feedback using the k2 parameter. This parameter specifies the time offset from the end of the physical channel carrying sidelink data to the start of the physical channel for HARQ feedback, allowing the terminal device to complete processing within a guaranteed time window.
Solution Approach 2:
The patent uses parameter changes by configuring different timing offset values (k1, k2, k3) based on processing requirements. These parameters allow flexible adjustment of timing relationships to match different terminal device processing capabilities and channel conditions, optimizing both processing time availability and communication efficiency.
3Stability of the object's composition
If the network device receives HARQ information at a specified time, then it can maintain synchronized scheduling, but the terminal device must complete processing within a constrained time window
Solution Approach 1:
The patent resolves timing coordination complexity through parameter changes by using predefined timing offset parameters (k1 for scheduling to feedback, k2 for data to feedback, k3 for data to retransmission) that establish stable, predictable timing relationships. These parameters enable both network device and terminal device to maintain synchronized scheduling without complex real-time coordination, as both sides follow the same predetermined timing rules.
Data Source
AI summary
This application provides a sidelink feedback information transmission method and a communications apparatus, and may be used in a system such as an internet of vehicles, V2X, or V2V. The method includes: sending sidelink scheduling information to a first terminal device on a first channel, where the sidelink scheduling information is used to schedule the first terminal device to send sidelink data to a second terminal device on a sidelink; and determining a second channel, where the second channel is used to receive, from the first terminal device, HARQ information for the sidelink data.