Sidelink Resource Selection Using Triggered Resource Set Exchange
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Solution Overview
Problem
The existing D2D communication systems face issues such as hidden terminals, half-duplex constraints, and excessive power consumption due to continuous resource listening, which affect transmission performance and efficiency in V2X communication.
Innovation Solution
A method where a first device transmits a signaling to a second device to trigger the transmission of a resource set, which assists in sidelink (SL) transmission resource selection, and the second device sends the resource set to the first device during its active time to optimize resource selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal continuously listens to resources in the listening process to determine available resources, then the resource selection reliability is improved, but the power consumption increases excessively
Solution Approach 1:
The patent introduces discontinuous reception (DRX) cycles with alternating active and sleep periods. During active periods, terminals perform resource listening and selection; during sleep periods, terminals reduce power consumption by stopping listening. This periodic operation pattern resolves the contradiction by making resource listening intermittent rather than continuous, thereby reducing overall power consumption while maintaining adequate resource selection reliability through properly timed active listening periods.
2Use of energy by moving object
If the second device is in sleep state during DRX cycle to save power, then the power consumption is reduced, but the first device cannot receive resource set from second device
Solution Approach 1:
The patent implements a mechanism where the first device sends a trigger signal to the second device before the second device enters sleep state. This trigger signal prompts the second device to transmit the resource set during its active period. By performing this preliminary action of triggering resource set transmission before the sleep state begins, the system ensures that the resource set is delivered while the second device is still awake, preventing information loss while maintaining power savings during subsequent sleep periods.
3Reliability
If the enhanced resource selection scheme is implemented with resource listening, then the hidden terminal and half-duplex problems are solved, but the system performance deteriorates due to DRX sleep state
Solution Approach 1:
The patent implements a feedback mechanism where the first device sends a trigger signal to the second device, requesting the resource set. The second device responds by transmitting the resource set during its active period. This feedback loop ensures that resource selection information is exchanged successfully even with DRX cycles, maintaining both transmission reliability (by solving hidden terminal and half-duplex issues through resource set exchange) and system performance (by coordinating transmissions during active periods).
Data Source
AI summary
The disclosure provides a method for resource selection and a first device. The method is applied to a first device and includes the following. A first signaling is transmitted to a second device, where the first signaling is used to trigger the second device to transmit a resource set to the first device, and the resource set is used to assist the first device in sidelink (SL) transmission resource selection. The resource set is received from the second device. A resource for SL transmission is selected according to the resource set.