Sidelink Resource Selection Using DRX Active Time Windows
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Solution Overview
Problem
Sidelink data transmission in mobile communication systems is prone to failure due to the RX UE not always being in a receiving state, as it supports Discontinuous Reception (DRX) configurations, leading to instability in data transmission.
Innovation Solution
A resource selection method and apparatus where a higher layer of a terminal sends DRX-related information to the physical layer to assist in selecting candidate resources for sidelink transmission, including DRX configuration information, active times for onDurationTimer, InactivityTimer, and RetransmissionTimer, allowing the physical layer to properly select resources and report them back for stable transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the RX UE uses DRX configuration to save energy, then energy consumption is reduced, but data transmission reliability deteriorates
Solution Approach 1:
The transmitting UE performs preliminary actions by determining the active time of the receiving UE based on DRX configuration parameters (onDurationTimer, inactivityTimer, retransmissionTimer) before actual data transmission. This allows the transmitting UE to identify suitable transmission resources that coincide with the receiving UE's active periods, ensuring reliable delivery while the receiving UE maintains energy-saving DRX operation.
2Reliability
If the RX UE remains in continuous receiving state to ensure transmission reliability, then data transmission stability is improved, but energy consumption increases
Solution Approach 1:
The transmitting UE acts as an intermediary that translates the receiving UE's DRX configuration parameters into actionable transmission timing information. By calculating active time windows based on these parameters, the transmitting UE enables reliable communication during active periods without requiring the receiving UE to maintain continuous reception, thus preserving energy while ensuring stability.
3Ease of operation
If the transmitting UE selects transmission resources without considering DRX active time, then resource selection simplicity is maintained, but transmission failure rate increases
Solution Approach 1:
The transmitting UE changes the selection criteria for transmission resources by incorporating DRX-related parameters (onDurationTimer, inactivityTimer, retransmissionTimer) into the resource selection process. This parameter-based approach systematically identifies transmission opportunities during active time windows, improving success rates while maintaining procedural simplicity through standardized parameter usage.
Data Source
AI summary
A resource selection method is provided. The resource selection method includes sending, by a higher layer of a first terminal, first information to a physical layer of the first terminal. The first information is used for assisting the physical layer of the first terminal in selecting candidate resources for sidelink transmission. The first information includes second information related to sidelink Discontinuous Reception (DRX) of a second terminal. The second terminal is a peer terminal for the first terminal to perform sidelink transmission. The resource selection method further includes receiving, by the higher layer of the first terminal, candidate resources reported by the physical layer of the first terminal. The resource selection method also includes selecting, by the higher layer of the first terminal, a transmission resource from the candidate resources reported by the physical layer of the first terminal.