Extending Selection Window in NR V2X Sidelink DRX
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Solution Overview
Problem
In sidelink communication, especially for vulnerable road users with battery-based operation, the efficiency of sidelink (SL) communication is degraded due to the inability of transmitting UEs performing SL discontinuous reception (DRX) operation to select appropriate candidate resources during active time durations.
Innovation Solution
A method is introduced where a UE determines a selection window for selecting SL resources within an active time related to SL DRX, performs sensing within a sensing window, selects candidate resources, and extends the selection window if the number of candidate resources is less than or equal to a first threshold, thereby including inactive time durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a transmitting UE performs SL DRX operation and selects SL transmission resources only in active time duration, then power saving is achieved, but the number of candidate resources is insufficient and communication efficiency is degraded
Solution Approach 1:
The UE performs sensing operations during inactive time duration before the active time, preparing candidate resource information in advance. This preliminary sensing allows the UE to have sufficient candidate resources ready when active time arrives, resolving the contradiction between power saving and having enough resources for efficient communication.
2Use of energy by moving object
If a transmitting UE restricts resource selection to active time duration only, then DRX power saving operation is maintained, but resource collision with other UEs increases
Solution Approach 1:
The UE performs sensing during inactive time to identify and reserve candidate resources before active time begins. This advance preparation allows the UE to select resources with lower collision probability while maintaining DRX power saving operation, as the resource selection decision is made with broader information than would be available if sensing were restricted to active time only.
Data Source
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AI summary
A method for a first device carrying out wireless communication may be provided according to one embodiment. The method may comprise the steps of: determining, within an active time associated with sidelink (SL) discontinuous reception (DRX), a selection window for selecting a SL resource; determining a sensing window associated with the selection window; carrying out sensing within the sensing window; selecting, on the basis of the sensing, at least one candidate resources in the selection window; and extending the selection window on the basis that the quantity of the at least one candidate resources is equal to or less than a first threshold. For example, the period of the extended selection window may include an inactive time associated with the SL DRX.