Dynamic Threshold Resource Selection for D2D PSSCH
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Solution Overview
Problem
In wireless communication systems, existing technologies face challenges in performing measurements and selecting transmission resources effectively for device-to-device (D2D) communication, particularly in differentiated scenarios such as initial transmissions versus retransmissions and varying redundancy versions, which affects the efficiency and protection of signal transmission.
Innovation Solution
A method where a D2D user equipment (UE) receives a physical sidelink control channel (PSCCH) and physical sidelink shared channel (PSSCH), measures the energy of the PSSCH, and selects a transmission resource only if the energy exceeds a threshold that varies based on whether the PSSCH is an initial transmission or a retransmission, or according to its redundancy version, thereby excluding the resource area of the PSSCH transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single fixed threshold is used for energy measurement, then the device complexity is reduced, but the reliability of resource selection deteriorates in differentiated scenarios
Solution Approach 1:
The patent applies dynamics by transitioning from a static fixed threshold to a dynamic threshold that adapts based on transmission scenario. The threshold is adjusted according to whether the transmission is an initial transmission or a retransmission, and according to the redundancy version (RV) index, enabling the system to optimize resource selection reliability for different transmission conditions without requiring completely separate threshold sets for each scenario.
Solution Approach 2:
The patent implements local quality by applying different threshold values for different local scenarios within the overall resource selection process. Specifically, separate threshold values are defined for initial transmissions versus retransmissions, and for different RV indices, allowing each local scenario to be optimized independently while maintaining a unified resource selection mechanism.
2Reliability
If resource area is excluded based on energy measurement, then the protection of signal transmission is improved, but the quantity of available transmission resources decreases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the energy threshold parameter based on transmission scenario and RV index. By changing the threshold parameter adaptively, the system achieves better signal protection when needed (higher thresholds for retransmissions) while maintaining more available resources when possible (lower thresholds for initial transmissions), thus optimizing the balance between protection and resource availability.
3Reliability
If differentiated thresholds are applied for initial transmission and retransmission, then the reliability of retransmission is improved, but the loss of time for resource selection increases
Solution Approach 1:
The patent applies preliminary action by pre-defining and configuring different threshold values for initial transmissions and retransmissions, as well as for different RV indices. This preliminary configuration allows the UE to quickly determine the appropriate threshold without complex real-time calculations, reducing the time penalty associated with differentiated threshold application while maintaining high retransmission reliability.
Data Source
AI summary
A method for transmitting a physical sidelink shared channel (PSSCH), by a device-to-device (D2D) terminal, in a wireless communication system involves receiving a physical sidelink control channel (PSCCH) and a PSSCH transmitted in a resource region indicated by the PSCCH. If an energy measurement value with respect to the PSSCH is greater than a preset threshold, the method further involves selecting a transmission resource excluding the resource region in which the PSSCH has been transmitted; and transmitting a D2D signal by means of the selected transmission resource, wherein the threshold has a value that varies in accordance with whether or not the PSSCH is retransmission or the redundancy version (RV) of the PSSCH.