HARQ Feedback Interpretation in Sidelink Unlicensed Bands

The patent applies parameter changes by using different interpretation rules based on service-related parameters (QoS requirements, reliability targets) and channel-related parameters (channel conditions, interference levels). The transmitting UE selects among multiple interpretation rules (e.g., interpreting absence as ACK, NACK, or DTX) depending on the specific parameter values, thereby resolving the contradiction by adapting the interpretation approach to the current transmission context rather than using a fixed complex interpretation mechanism.

The patent applies dynamics by making the retransmission decision dynamic rather than static. The transmitting UE dynamically selects the interpretation rule based on current service requirements and channel conditions. When channel conditions are good and QoS requirements are low, the UE may interpret absence as ACK and avoid retransmission. When conditions warrant higher reliability, the UE interprets absence as NACK and performs retransmission. This dynamic adaptation resolves the contradiction by optimizing the balance between reliability and resource efficiency based on real-time conditions.

The patent applies preliminary action by pre-configuring multiple interpretation rules with specific criteria and conditions before actual transmission occurs. The rules are prepared in advance based on different service types, QoS requirements, and channel conditions. During operation, the transmitting UE simply selects from these pre-prepared rules based on matching criteria, rather than creating complex interpretation logic in real-time. This resolves the contradiction by preparing adaptability in advance, reducing the complexity burden during actual transmission decisions.