User Device DRX During Non-Terrestrial Random Access Waits

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Solution Overview

Problem

User devices in non-terrestrial wireless communication systems, such as those using satellites, experience prolonged power consumption during random access procedures due to extended signal transmission and reception times, which reduces their lifespan in various environments.

Innovation Solution

Implementing a power management method that sets the user device to a discontinuous reception mode during specific communication wait intervals, allowing the device to conserve power by reducing unnecessary signal monitoring during these intervals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the user device continuously monitors signals during the entire random access procedure, then communication reliability is improved, but power consumption increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic discontinuous reception (DRX) cycles during the random access procedure, where the user device alternates between active reception periods and sleep periods. The device sets a DRX cycle with specific on-duration and off-duration, transitioning between monitoring and power-saving states periodically throughout the random access process, thereby reducing continuous power consumption while maintaining periodic communication capability

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent dynamically adjusts the reception mode based on the current random access stage and timing. The power management device dynamically switches between continuous reception and discontinuous reception modes depending on the elapsed time since the last random access preamble transmission and the current position in the random access procedure, optimizing the balance between reliability and power consumption at each stage

Inventive Principle:

Principle #15Dynamics

2Productivity

If the user device waits continuously for the reception window interval, then communication performance is maintained, but power consumption increases

Engineering Contradiction:

Improvecommunication performanceVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent calculates and sets the discontinuous reception mode configuration in advance based on the elapsed time since the last random access preamble transmission. The power management device preliminarily determines the optimal DRX parameters before the reception window interval begins, allowing the device to enter power-saving mode while pre-calculating when reception monitoring should resume, thus maintaining communication performance expectations while reducing power consumption during the wait period

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250220767A1User device performing discontinuous reception during random access in wireless communication system, and method for operating the same

Publication Date: 2025.07.03 SAMSUNG ELECTRONICS CO LTD

AI summary

A method of operating a user device wirelessly communicating with a non-terrestrial communication device includes transmitting a first message including a plurality of random access preambles to the non-terrestrial communication device, setting a power management device of the user device to a first discontinuous reception mode, during a first communication wait interval between a first time point, at which the last random access preamble among the plurality of random access preambles is transmitted, and a second time point at which a reception window interval starts, and receiving a second message corresponding to the first message from the non-terrestrial communication device, during the reception window interval.