Sidelink DRX Resource Coordination for Peer UE Active Time
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Solution Overview
Problem
Existing inter-UE coordination methods for sidelink communication assume perpetual availability of peer UEs for reception and transmission, which is not feasible when using sidelink DRX configurations for power savings, leading to disruptions in resource selection and increased transmission errors.
Innovation Solution
The proposed solution involves determining an intersection of resource sets with DRX active times between peer UEs and signaling this intersection to the transmitter UE, allowing it to perform resource selection during the active time, and updating the active time based on timer restarts to ensure efficient sidelink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sidelink DRX configuration is used for power savings, then energy consumption is reduced, but resource selection reliability deteriorates due to peer UE unavailability during inactive periods
Solution Approach 1:
The transmitting UE performs sensing and resource selection in advance during the receiving UE's active time, identifying suitable resources before data transmission is needed. This preliminary action ensures resources are pre-coordinated and validated while the peer UE is available, eliminating the need for real-time coordination during inactive periods and maintaining reliability despite DRX power-saving modes.
Solution Approach 2:
The patent introduces an intermediary coordination mechanism where the transmitting UE uses sensed channel conditions and previously established resource patterns to select resources that are likely to be available during the receiving UE's active time. This intermediary approach bridges the gap between power-saving DRX operation and reliable resource selection by using historical and predictive information rather than direct real-time coordination.
2Adaptability or versatility
If resource selection is performed without considering DRX active time, then resource allocation flexibility is improved, but transmission errors increase due to peer UE unavailability
Solution Approach 1:
The resource selection process is made dynamic by continuously sensing channel conditions and adapting resource choices based on the receiving UE's DRX active time patterns. The transmitting UE adjusts its resource selection strategy in real-time, combining flexible resource allocation with awareness of peer availability, thus maintaining both adaptability and transmission reliability.
Solution Approach 2:
The system implements feedback mechanisms where the transmitting UE monitors channel conditions, transmission outcomes, and inferred peer UE availability patterns. This feedback is used to continuously refine resource selection decisions, ensuring that resources are chosen not only for flexibility but also for alignment with the receiving UE's active periods, thereby reducing transmission errors.
3Speed
If resource selection is performed during inactive periods, then resource allocation speed is improved, but resource selection accuracy deteriorates due to lack of channel awareness
Solution Approach 1:
Channel sensing and resource evaluation are performed in advance during active periods when the UE has channel awareness. The results of this preliminary action are stored and used to guide rapid resource selection during inactive periods, combining the accuracy of informed decision-making with the speed of pre-prepared resource allocation.
Solution Approach 2:
The UE performs periodic sensing and resource evaluation during active periods, creating a rhythm of information gathering followed by rapid resource selection during inactive periods. This periodic pattern ensures channel awareness is maintained at regular intervals while allowing fast resource allocation to occur during lower-activity phases, balancing accuracy and speed.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for inter-UE coordination when using SL discontinuous reception (“DRX”). One apparatus includes a transceiver and a processor that determines a DRX configuration that is to be used towards a peer UE, where the DRX configuration includes an active time during which sidelink data is exchanged with the peer UE. The processor determines a set of resources for sidelink communication and identifies an intersection of the active time and the set of resources. The transceiver transmits to the peer UE an indication of the identified intersection of the active time and the set of resources.