NR V2X Sidelink DRX Resource Reselection Under Packet Delay Budget
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing sidelink (SL) communication resources, particularly in vehicle-to-everything (V2X) scenarios, due to increasing data traffic and the need for enhanced mobile broadband, ultra-reliable, and low-latency communications, which are not adequately addressed by current radio access technologies.
Innovation Solution
A method is proposed for a user equipment (UE) to operate by starting specific timers and performing SL communication within active times, including mechanisms for resource pre-emption and discontinuous reception (DRX) configurations to optimize SL communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Mode 2 resource allocation is used for SL communication, then resource utilization flexibility is improved, but resource management complexity increases
Solution Approach 1:
The patent applies preliminary action by performing resource reevaluation and pre-emption checks before actual SL transmission occurs. The UE evaluates resource availability and performs necessary reselection operations in advance, ensuring that when transmission time arrives, resources are already confirmed to be available and valid, thus managing complexity proactively rather than reactively
Solution Approach 2:
The patent implements dynamics through the dynamic resource reevaluation mechanism where the UE continuously monitors resource availability and adapts its resource selection based on current channel conditions and interference levels. This dynamic approach allows the system to maintain flexibility while managing complexity through structured reevaluation procedures
2Use of energy by moving object
If DRX operation is implemented for power saving, then energy consumption is reduced, but resource reevaluation timing becomes more complex
Solution Approach 1:
The patent applies periodic action by scheduling resource reevaluation operations to occur at specific DRX cycle boundaries or at predetermined intervals within the DRX framework. This periodic structure allows the UE to enter low-power states between evaluations while ensuring resources are reevaluated at appropriate intervals, simplifying the timing complexity through regular periodic patterns
Solution Approach 2:
The patent implements feedback mechanisms where the UE monitors resource availability outcomes and uses this feedback to adjust future reevaluation timing and frequency. The system learns from previous resource selection outcomes and adapts its DRX operation accordingly, reducing energy consumption while maintaining appropriate reevaluation frequency
3Loss of time
If resource pre-emption is allowed for high priority traffic, then latency for urgent communications is reduced, but resource allocation fairness deteriorates
Solution Approach 1:
The patent applies local quality by implementing differentiated resource allocation rules for different priority levels. High priority traffic receives preferential treatment through pre-emption capabilities in specific scenarios, while low priority traffic maintains guaranteed minimum resources. This localized quality differentiation allows latency reduction for urgent communications while preserving fairness through priority-aware resource management
4Loss of energy
If SL communication operates without eNB intervention, then system overhead is reduced, but resource coordination efficiency decreases
Solution Approach 1:
The patent implements self-service through autonomous resource selection and reevaluation mechanisms where UEs independently perform sensing, resource selection, and conflict resolution without eNB intervention. The system maintains coordination efficiency through distributed algorithms that enable UEs to autonomously negotiate resource usage and resolve conflicts, achieving both overhead reduction and maintained coordination through self-organizing behavior
Data Source
AI summary
A method and corresponding device. The method includes: starting a first timer related to an on-duration of a sidelink (SL) discontinuous reception (DRX) configuration; starting a second timer related to an active time of the SL DRX configuration; determining a sensing window; performing sensing within the sensing window; and selecting a first SL resource within a first selection window, based on a result of the sensing. Here, the first selection window is included within the active time. The method further includes reselecting a second SL resource within a second selection window within packet delay budget (PDB) of SL data, based on collision of the first SL resource and the first selection window not including any available resource. Here, the second selection window is not included within the active time. The method further includes transmitting, to a second device, the SL data based on the second SL resource.