Scheduling Request Transmit Opportunity Based on DRX Cycle

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Solution Overview

Problem

Wireless communication systems face inefficiencies in power consumption due to frequent switching on and off of components during power-saving modes like Discontinuous Reception (DRX), which reduces the effectiveness of power-saving schemes and increases energy consumption.

Innovation Solution

A method and apparatus for determining an optimized transmit opportunity for scheduling requests (SR) based on the DRX time cycle, allowing the UE to delay SR transmissions until the end of a DRX cycle or select a later opportunity to minimize 'rude wake-ups' and maximize power-saving benefits, thereby reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If the UE transmits scheduling requests immediately when data arrives, then the transmission delay is reduced, but the power consumption increases due to frequent DRX cycle interruptions

Engineering Contradiction:

Improvetransmission delayVSAvoidpower consumption

Core Design Contradiction:

Loss of timeVSUse of energy by moving object

Solution Approach 1:

The UE performs preliminary assessment of buffer status and timing relationships before transmitting scheduling requests. The device determines whether to transmit SR immediately or wait for the next DRX active period by evaluating buffer urgency and timing parameters in advance, avoiding premature DRX cycle interruptions and reducing unnecessary power consumption.

Inventive Principle:

Principle #10Preliminary action

2Use of energy by moving object

If the UE delays scheduling request transmission to align with DRX cycles, then power consumption is reduced, but the transmission delay increases

Engineering Contradiction:

Improvepower consumptionVSAvoidtransmission delay

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The UE dynamically adjusts the SR transmission timing based on real-time buffer status, DRX cycle timing, and service requirements. The device can switch between immediate transmission mode (when buffer urgency is high) and DRX-aligned transmission mode (when buffer urgency is low), optimizing the trade-off between delay and power consumption adaptively.

Inventive Principle:

Principle #15Dynamics

3Reliability

If the UE frequently wakes up to check for scheduling opportunities, then the responsiveness to data transmission is improved, but the effectiveness of power-saving schemes is reduced

Engineering Contradiction:

ImproveresponsivenessVSAvoidenergy expenditure

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The UE autonomously monitors its own buffer status and determines SR transmission timing without requiring frequent network interactions or continuous reception. The device self-manages the balance between responsiveness and power saving by intelligently deciding when to wake up for SR transmission based on buffer urgency and DRX timing, reducing unnecessary wake-ups while maintaining transmission reliability.

Inventive Principle:

Principle #25Self-service

Data Source

PatentEP2735205B1Method and apparatuses for determining a transmit opportunity for transmitting a scheduling request

Publication Date: 2019.11.27 QUALCOMM INC

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AI summary

Certain aspects of the disclosure relate generally to techniques for managing scheduling requests (SRs) for resources for uplink transmission. For example, certain aspects of the present disclosure relate to a method for wireless communication including determining a transmit opportunity for transmitting SR for uplink resources based, at least in part, on a discontinuous reception (DRX) time cycle. According to certain aspects, a user equipment (UE) may delay transmitting the SR based on the DRX time cycle to prevent repeated interruption of the DRX cycle that may reduce benefits of the power-saving DRX scheme.