NR V2X Sidelink MAC Reset and Uu DRX Timer Management
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Solution Overview
Problem
The existing wireless communication systems face challenges in clearly defining the operation of sidelink resource allocation mode 1 and Uu DRX timer management during sidelink interface MAC reset, leading to unnecessary power consumption and signaling overhead.
Innovation Solution
A method is provided where a device establishes a PC5-RRC connection and obtains DRX configuration, including Uu DRX timer information, and stops the Uu DRX timer upon request for sidelink specific MAC reset, defining the DRX HARQ RTT timer as a minimum duration before retransmission grant and the DRX retransmission timer as a maximum duration until grant receipt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink interface MAC reset is requested during Uu DRX timer operation, then sidelink communication reliability is improved, but unnecessary power consumption occurs due to continued DRX timer operation
Solution Approach 1:
The patent extracts and separates the sidelink MAC reset operation from the Uu interface DRX timer management. When a sidelink MAC reset is requested, the system specifically targets and resets only the sidelink MAC layer parameters while leaving the Uu interface DRX timer operation unchanged, thereby avoiding unnecessary power consumption from stopping and restarting the DRX timer.
Solution Approach 2:
Instead of stopping the Uu DRX timer when sidelink MAC reset is requested (which would cause power consumption), the patent inverts the approach by maintaining the DRX timer operation and only resetting the sidelink-specific MAC parameters. This inversion eliminates the harmful effect of unnecessary timer management while achieving the desired sidelink communication reset.
2Productivity
If sidelink interface MAC reset is requested, then sidelink communication efficiency is improved, but signaling overhead increases due to undefined operations
Solution Approach 1:
The patent segments the MAC reset operation into interface-specific components. It distinguishes between Uu interface MAC parameters and sidelink MAC parameters, allowing selective resetting of only the necessary sidelink parameters without triggering unnecessary Uu interface signaling procedures. This segmentation reduces signaling overhead while maintaining communication efficiency.
Solution Approach 2:
The patent enables the sidelink MAC layer to perform self-reset operations for its own parameters without requiring extensive signaling from upper layers or other interfaces. By defining clear procedures for sidelink-specific MAC reset, the system reduces the need for additional signaling messages and achieves efficient sidelink communication reset autonomously.
Data Source
AI summary
Proposed are a method by which a first device carries out wireless communication, and an apparatus supporting same. The first device may establish a PC5-RRC connection with a second device. For example, the first device may acquire a DRX configuration including information related to a Uu DRX timer. For example, a time during which the DRX retransmission timer is running may be a time included in an active time of the first device. For example, the first device may initiate the Uu DRX timer. For example, an SL-specific MAC reset for the PC5-RRC connection with the second device is requested, and the initiated Uu DRX timer may stop on the basis that the initiated Uu DRX timer is running.