Data Retransmission Method for Communication Systems
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Solution Overview
Problem
Existing data retransmission methods in communication systems lead to power consumption and resource waste due to transmission conflicts between sidelink and uplink data, causing issues with HARQ feedback mechanisms.
Innovation Solution
A data retransmission method where a receiving UE determines, based on the HARQ feedback mode, whether to start a retransmission timer when the RTT timer expires and a PSFCH is not sent, thereby avoiding unnecessary retransmissions and resource wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiving UE starts a retransmission timer when RTT timer expires and PSFCH is not sent, then data transmission reliability is improved, but power consumption and resource waste increase due to unnecessary retransmissions
Solution Approach 1:
The patent changes the parameter of retransmission timer starting condition based on the HARQ feedback mode. When the feedback mode is ACK/NACK and data reception fails, the retransmission timer is started. When the feedback mode is NACK-only and data reception succeeds, the retransmission timer is not started. This conditional parameter change resolves the contradiction by making retransmission behavior adaptive to the specific feedback mode and reception outcome.
Solution Approach 2:
The patent utilizes the HARQ feedback mechanism to determine whether to start the retransmission timer. The feedback information (ACK/NACK mode and reception success/failure) directly controls the retransmission decision, ensuring that retransmissions only occur when actually needed, thus reducing unnecessary power consumption while maintaining reliability.
2Reliability
If the receiving UE starts a retransmission timer when RTT timer expires and PSFCH is not sent, then data transmission reliability is improved, but resource waste increases due to unnecessary retransmissions
Solution Approach 1:
The patent modifies the retransmission timer starting condition parameter based on HARQ feedback mode and data reception outcome. By changing this parameter dynamically, the system avoids unnecessary retransmissions that would waste communication resources while ensuring reliable delivery when needed.
Solution Approach 2:
Instead of always starting the retransmission timer (excessive action), the patent applies partial action by starting it only in specific conditions where it is actually needed. This prevents resource waste from unnecessary retransmissions while maintaining sufficient reliability through targeted retransmission attempts.
3Reliability
If the receiving UE always monitors for retransmissions after RTT timer expiry, then data reception completeness is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent changes the monitoring behavior parameter based on HARQ feedback mode and reception outcome. The receiving UE adjusts whether to start the retransmission timer and monitor for retransmissions according to the specific conditions, reducing processing overhead while maintaining reception completeness through conditional monitoring.
Data Source
AI summary
The present disclosure belongs to the technical field of communications. Provided are a data retransmission method and device, and a storage medium and an apparatus. The method comprises: in response to a round-trip time (RTT) timer timing out, and a receiving UE not sending a PSFCH, determining, on the basis of a hybrid automatic repeat request (HARQ) feedback mode corresponding to the receiving UE, whether to start a retransmission timer. By means of the method provided in the present disclosure, power consumption of a UE and a waste of resources can be avoided.