NR V2X DRX Timing for Coordinated Sidelink and Uplink Activity

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing V2X communication systems face challenges in efficiently managing uplink and sidelink discontinuous reception (DRX) configurations, particularly in scenarios where vehicles operate outside network coverage, leading to suboptimal resource utilization and communication efficiency.

Innovation Solution

A WTRU is configured to receive sidelink data, decode physical downlink control channels, and report sidelink-related information to the network, enabling independent sidelink DRX parameters and monitoring indications, while determining timers and resource allocations based on sidelink timing and priority, and informing peer WTRUs of activity behavior.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a WTRU operates outside network coverage with pre-configured DRX parameters, then the device can autonomously perform V2X communication, but resource utilization becomes suboptimal and communication efficiency deteriorates

Engineering Contradiction:

Improveautonomous operation capabilityVSAvoidcommunication efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent implements dynamic DRX configuration where the WTRU transitions from static pre-configured parameters to dynamic network-configured parameters upon entering coverage. The system adapts DRX parameters (cycle length, offset, active time) based on real-time network conditions and service requirements, allowing optimal performance in both out-of-coverage and in-coverage scenarios

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes DRX parameters dynamically based on coverage status and service type. When in coverage, the network configures optimized DRX parameters considering current traffic patterns, channel conditions, and QoS requirements. The WTRU reports sidelink activity information to trigger parameter reconfiguration, ensuring parameters remain optimal as conditions change

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the WTRU monitors both PDCCH and PSCCH simultaneously during active time, then uplink and sidelink communications are maintained, but energy consumption increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic monitoring where the WTRU activates PDCCH and PSCCH monitoring only during configured active time intervals. During DRX sleep periods, both monitoring functions are suspended. The active time is periodically renewed based on scheduled communications or activity reports, creating a rhythmic on-off pattern that reduces average power consumption while maintaining communication reliability

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent merges PDCCH and PSCCH monitoring into a unified DRX framework. Both downlink control channel and sidelink control channel monitoring are coordinated under the same active time configuration, allowing the WTRU to synchronize its receiver activation for both channels simultaneously, reducing the overhead of separate monitoring cycles and optimizing energy efficiency

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If the WTRU extends active time to accommodate sidelink transmissions, then sidelink communication reliability improves, but uplink resource utilization deteriorates

Engineering Contradiction:

Improvesidelink communication reliabilityVSAvoiduplink resource utilization

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements dynamic active time adjustment where the WTRU extends its active time period specifically for sidelink monitoring and transmission based on sidelink activity reports. The extension is calculated to cover the duration needed for sidelink operations while minimizing impact on uplink scheduling. The network dynamically adjusts uplink grants to fit within the extended active time window

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent uses preliminary scheduling where the network anticipates sidelink activity based on reported traffic patterns and pre-configures extended active time periods in advance. This allows the WTRU to prepare for sidelink transmissions without last-minute extensions that would disrupt uplink resources. The preliminary configuration aligns both uplink and sidelink activities within predetermined time windows

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12556318B2Method and apparatus for performing simultaneous sidelink discontinuous (DRX) and uplink DRX in new radio (NR) vehicle to everything (V2X)

Publication Date: 2026.02.17 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Methods and apparatus for uplink DRX and sidelink DRX are disclosed. A WTRU may receive a configuration of a hybrid automatic repeat request (HARQ) round trip time (RTT) timer. The WTRU may start the HARQ RTT timer in response to an event. The event may comprise receiving a downlink control information (DCI) that schedules a sidelink transmission. The event may comprise transmission of a sidelink control information (SCI) for the sidelink HARQ process. The event may comprise receiving HARQ feedback for a sidelink transmission. The event my comprise a pre-configured time period following a physical sidelink feedback channel (PSFCH) resource for feedback associated with a HARQ transmission. The WTRU may determine a value of a timer based on a sidelink transmission property or a sidelink transmission time.