Sidelink DRX Resource Sensing for Low-Power V2X Scheduling
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing sidelink (SL) communication for vehicle-to-everything (V2X) scenarios, particularly in terms of resource allocation and power consumption, which are critical for supporting enhanced mobile broadband, massive Machine Type Communication (MTC), Ultra-Reliable and Low Latency Communication (URLLC), and vehicle-to-everything (V2X) communication.
Innovation Solution
A method is proposed for determining a sensing window and a selection window for SL resource allocation based on discontinuous reception (DRX) configuration, enabling efficient selection of sidelink resources for data transmission and scheduling through physical sidelink control channels, thereby optimizing SL communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous monitoring of sidelink channels is performed for resource selection, then resource allocation reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies discontinuous reception (DRX) configuration to perform sidelink channel sensing periodically rather than continuously. The UE wakes up at specific intervals within the DRX cycle to perform sensing and resource selection, then enters sleep mode during inactive periods. This periodic action maintains resource allocation reliability by ensuring sensing occurs at regular intervals while dramatically reducing power consumption by eliminating continuous monitoring.
2Manufacturing precision
If sensing window is extended to improve resource selection accuracy, then resource allocation precision is improved, but latency increases
Solution Approach 1:
The patent dynamically adjusts the sensing window duration and position based on the DRX cycle configuration and traffic characteristics. The sensing window is configured to start at a specific offset within the DRX cycle and extends for a duration that balances accuracy and latency requirements. This dynamic configuration allows the system to adapt the sensing window parameters according to service requirements, achieving optimal resource selection accuracy while minimizing latency.
Solution Approach 2:
The patent performs sensing operations in advance during the sensing window before the actual resource selection and transmission. By configuring the sensing window to occur prior to the selection window within the DRX cycle, the UE can identify suitable resources beforehand, ensuring accurate resource selection while meeting latency constraints for time-sensitive traffic.
3Use of energy by stationary object
If DRX cycle duration is increased to reduce power consumption, then power efficiency is improved, but resource selection responsiveness deteriorates
Solution Approach 1:
The patent changes the DRX cycle parameters including cycle duration, active time offset, and sensing window configuration to optimize both power efficiency and responsiveness. By adjusting these parameters based on traffic patterns and service requirements, the system can use longer DRX cycles for power savings during low-activity periods while maintaining shorter effective cycles or more frequent sensing opportunities when responsiveness is critical, thus achieving both goals through parameter optimization.
Data Source
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AI summary
Proposed is an operation method of a first device (100) in a wireless communication system. The method may comprise the steps of: determining a sensing window associated with data to be transmitted; determining a selection window associated with the data to be transmitted; on the basis of sensing carried out within the sensing window, selecting a sidelink (SL) resource, within the selection window and a first active time determined on the basis of a SL discontinuous reception (DRX) configuration; on the basis of the SL resource, transmitting first sidelink control information (SCI), for scheduling a physical sidelink shared channel (PSSCH), to a second device (200) through a physical sidelink control channel (PSCCH); and, on the basis of the SL resource, transmitting second SCI and the data to the second device (200) through the PSSCH.