NR V2X Sidelink DRX Reset Logic for MAC CE Trigger Cancellation

Solution Overview

Problem

In wireless communication systems, unnecessary generation and signaling of DRX command MAC CEs occur during sidelink interface MAC resets, leading to inefficient resource utilization and increased latency.

Innovation Solution

Implementing a method and apparatus to cancel triggered SL DRX command MAC CE reporting based on a requested MAC reset for PC5-RRC connections, thereby optimizing DRX timer management and reducing unnecessary monitoring of PSCCH.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE receives a request for sidelink interface MAC reset while running a DRX timer, then the DRX timer is stopped and PSCCH/PSSCH monitoring is stopped, but this causes unnecessary resource utilization and increased latency when a DRX command MAC CE is unnecessarily generated

Engineering Contradiction:

ImproveMAC reset reliabilityVSAvoidlatency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by checking whether a DRX command MAC CE should be triggered before actually triggering it. The UE determines in advance that when MAC reset is requested, the DRX command MAC CE reporting should be canceled, preventing unnecessary DRX timer stops and PSCCH monitoring interruptions before they occur

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies preliminary anti-action by canceling the DRX command MAC CE reporting trigger when MAC reset is requested. This counter-action prevents the harmful effect of unnecessarily stopping the DRX timer and monitoring PSCCH, thereby reducing latency and resource utilization during MAC reset operations

Inventive Principle:

Principle #9Preliminary anti-action

2Reliability

If the UE receives a request for sidelink interface MAC reset, then the UE stops monitoring PSCCH/PSSCH, but this causes unnecessary resource utilization when DRX command MAC CE is unnecessarily generated

Engineering Contradiction:

ImproveMAC reset reliabilityVSAvoidresource utilization

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies preliminary action by checking whether a DRX command MAC CE should be triggered before actually triggering it. The UE determines in advance that when MAC reset is requested, the DRX command MAC CE reporting should be canceled, preventing unnecessary DRX timer stops and PSCCH monitoring interruptions before they occur

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies preliminary anti-action by canceling the DRX command MAC CE reporting trigger when MAC reset is requested. This counter-action prevents the harmful effect of unnecessarily stopping the DRX timer and monitoring PSCCH, thereby reducing latency and resource utilization during MAC reset operations

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS12471160B2Method and apparatus for performing radio communication related to mac reset in NR V2X

Publication Date: 2025.11.11 LG ELECTRONICS INC

AI summary

A method for performing wireless communication by a first device and an apparatus supporting the same are proposed. For example, the first device may obtain an SL DRX configuration including information related to an SL DRX cycle and information related to a timer for active time. For example, the timer for active time may include at least one of an SL DRX on-duration timer or an SL DRX inactivity timer. For example, the first device may trigger SL DRX command MAC CE reporting related to the PC5-RRC connection. For example, the first device may cancel the triggered SL DRX command MAC CE reporting, based on an MAC reset for the PC5-RRC connection being requested.