Sidelink DRX Resource Selection in NR V2X
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently performing sidelink communication, particularly in vehicle-to-everything (V2X) scenarios, due to limitations in resource management and power consumption, which affect reliability and latency.
Innovation Solution
A method and device for performing sidelink communication by determining a selection window, selecting candidate resources within the active time of a sidelink discontinuous reception (DRX) configuration, and transmitting sidelink control information and data units using optimized resource allocation, thereby enhancing resource use efficiency and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resource selection window is extended to improve resource selection flexibility, then resource allocation efficiency is improved, but power consumption increases due to extended sensing and monitoring time
Solution Approach 1:
The patent applies dynamics by making the selection window configuration adaptive rather than fixed. The selection window is dynamically adjusted based on the DRX active time of the receiving device, allowing the transmitting device to optimize its resource selection period according to when the receiver is actually listening, thus improving efficiency without unnecessarily extending the monitoring period and increasing power consumption
Solution Approach 2:
The patent changes the parameter of selection window duration and timing by aligning it with the DRX active time parameters of the receiving device. By modifying the selection window to occur within or overlap with the receiver's active time, the system achieves better resource allocation while avoiding extended monitoring periods that would increase power consumption
2Reliability
If sensing period is extended to improve resource selection accuracy, then transmission reliability is improved, but latency increases due to longer waiting time for resource selection
Solution Approach 1:
The patent applies preliminary action by having the transmitting device perform resource selection and prepare transmission resources in advance, specifically within the selection window that is timed to occur before the DRX active time. This allows the transmitting device to complete sensing and resource selection beforehand, ensuring reliable transmission resources are ready before the receiver becomes active, thus improving reliability without adding latency during the actual transmission window
3Reliability
If DRX active time is extended to improve reception reliability, then data reception reliability is improved, but power consumption increases due to longer active monitoring period
Solution Approach 1:
The patent applies self-service by having the receiving device autonomously configure its DRX active time based on pre-configured parameters and the timing of expected transmissions. The device can independently determine its active time windows without continuous network control, allowing it to maintain reliable reception during critical periods while minimizing active time elsewhere to reduce power consumption
Data Source
AI summary
An operating method of a first device (100) in a wireless communication system is presented. The method may comprise the steps of: selecting X number of candidate resources on the basis of sensing within a selection window, the X number of candidate resources being included in the active time of an SL DRX configuration related to a second device (200); and selecting a transmission resource for the transmission of a MAC PDU on the basis of the X number of candidate resources.