Sidelink DRX ON-Duration Extension for Collision-Aware Power Saving

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Solution Overview

Problem

Existing sidelink communication technologies face challenges in efficiently managing discontinuous reception (DRX) operations, leading to high power consumption and increased probability of resource block collisions due to non-aligned DRX configurations and packet delay budget constraints.

Innovation Solution

The proposed solution involves extending DRX ON durations based on specific conditions, such as resource pool attributes, packet attributes, and communication type, using inactivity timers and hybrid automatic repeat request (HARQ) timers to align DRX configurations and reduce collisions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If DRX ON durations are extended to meet packet delay budget constraints, then communication reliability is improved, but power consumption increases

Engineering Contradiction:

Improvepacket delay budget complianceVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements dynamic DRX configuration where the network can adjust DRX cycle lengths, ON durations, and offset values based on real-time channel conditions and traffic patterns. This allows the system to switch between aggressive DRX (short cycles, longer ON durations) for reliable communication and conservative DRX (long cycles, shorter ON durations) for power savings, resolving the contradiction between reliability and power consumption

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes multiple DRX parameters simultaneously including cycle length, ON duration, and offset values to optimize the balance between power consumption and communication reliability. By adjusting these parameters based on channel quality and traffic requirements, the system can meet packet delay budgets while minimizing unnecessary wake-ups and power consumption

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If non-aligned DRX configurations are used to provide flexibility, then adaptability is improved, but resource block collision probability increases

Engineering Contradiction:

ImproveDRX configuration flexibilityVSAvoidresource block collision probability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent implements feedback mechanisms where UEs report their DRX configuration status and collision experiences to the network. The network uses this feedback to adjust offset values and cycle lengths to achieve better alignment between communicating UEs, reducing resource block collisions while preserving the flexibility of non-aligned configurations when beneficial

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent performs preliminary alignment calculations during DRX configuration setup, pre-computing offset values and cycle lengths that will minimize collisions for expected traffic patterns. This preliminary action reduces the need for reactive adjustments and maintains low collision probabilities while preserving configuration flexibility

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12513620B2Extending discontinuous reception (DRX) on durations in sidelink DRX operations

Publication Date: 2025.12.30 QUALCOMM INC

AI summary

Certain aspects provide a method for wireless communication by a first user equipment (UE), such as a receiver (RX) UE. The method generally includes receiving signaling configuring the first UE with a discontinuous reception (DRX) mode having one or more DRX ON durations for sidelink communications with at least a second UE, and deciding to extend a DRX ON duration of the one or more DRX ON durations configured for the first UE when the first UE is in the DRX ON duration and when one or more conditions are met.