Sidelink DRX Resource Selection for Groupcast
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sidelink (SL) communication technologies face challenges in efficiently performing groupcast transmissions within the SL discontinuous reception (DRX) active time, leading to potential failures in delivering MAC PDUs to receiving UEs during SL DRX operations.
Innovation Solution
A method and device for performing wireless communication that involves obtaining information related to a resource pool and a SL DRX configuration, generating a MAC PDU for groupcast transmission, and selecting SL resources for transmission based on sensing, ensuring that the selected resources are within the SL DRX active time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If SL DRX is used to reduce battery consumption, then energy efficiency is improved, but groupcast transmission reliability deteriorates due to resource selection outside active time
Solution Approach 1:
The transmitting UE performs sensing and resource selection in advance during the active time, identifying and reserving resources for future transmissions. This preliminary action ensures that resources are pre-configured within the active time window, allowing the UE to enter sleep mode confidently while maintaining transmission reliability through pre-selected resources that fall within the active time period.
Solution Approach 2:
The system dynamically adjusts resource selection based on the SL DRX active time configuration. The transmitting UE adapts its resource selection process to account for the dynamic sleep-wake cycles of both transmitting and receiving UEs, ensuring that transmissions occur only during active time windows when receivers are awake and able to decode packets.
2Reliability
If resource selection is restricted to SL DRX active time, then transmission reliability is improved, but resource availability deteriorates due to limited time window
Solution Approach 1:
The transmitting UE performs advance sensing and resource reservation during active time, identifying multiple candidate resources in advance. This preliminary resource selection allows the system to restrict transmissions to active time windows while maintaining adequate resource availability, as resources are pre-selected and reserved before the UE enters sleep mode.
Solution Approach 2:
The system extends resource selection across multiple dimensions including future active time windows and retransmission opportunities. By considering resources in subsequent active time periods and leveraging HARQ retransmission mechanisms, the system effectively expands the available resource pool beyond the immediate active time window, maintaining versatility while ensuring reliable delivery.
3Measurement precision
If sensing is performed continuously, then resource selection accuracy is improved, but energy consumption increases
Solution Approach 1:
The sensing operation is performed periodically during SL DRX active time windows rather than continuously. The transmitting UE conducts sensing and resource selection only when awake and active, leveraging the periodic nature of DRX cycles to maintain measurement accuracy while dramatically reducing energy consumption by shutting down sensing operations during sleep periods.
Solution Approach 2:
The UE performs sensing and resource selection in advance during active time, completing measurements and reservations before entering sleep mode. This preliminary sensing action ensures accurate resource selection is achieved during brief active windows, eliminating the need for continuous sensing while maintaining measurement precision through advance preparation.
Data Source
AI summary
A method of operating a first device 100 in a wireless communication system is proposed. The method may comprise: generating a MAC PDU related to a groupcast transmission; and selecting at least one SL resource for a transmission of the MAC PDU among a plurality of candidate resources in a resource pool, wherein a first SL resource included in the at least one SL resource is included in a first SL DRX active time, and the first SL resource being selected outside the first SL DRX active time is not allowed, based on the MAC PDU being related to groupcast transmission.