DRX Cycle Adjustment via MAC CE Count in Wireless Systems

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Solution Overview

Problem

Current wireless communication systems, such as LTE, face challenges in optimizing DRX operations to balance power consumption and data transmission efficiency, particularly in managing DRX cycles based on the number of DRX command MAC CEs received.

Innovation Solution

A method and apparatus for user equipment (UE) to switch between long and short DRX cycles based on the number of DRX command MAC CEs in a data unit, where receiving two or more CEs triggers the use of a long DRX cycle, and one CE triggers a short DRX cycle, allowing dynamic adjustment of DRX cycles to optimize power consumption and data transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the UE uses a short DRX cycle to respond to DRX command MAC CEs, then data transmission responsiveness is improved, but power consumption increases

Engineering Contradiction:

Improvedata transmission responsivenessVSAvoidpower consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by making the DRX cycle length adjustable based on the number of DRX command MAC CEs received. The UE dynamically switches between short and long DRX cycles: when multiple CEs are received, a short DRX cycle is used for rapid response; when one or no CEs are received, a long DRX cycle is used to conserve power. This dynamic adaptation resolves the contradiction between responsiveness and power consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the DRX cycle parameter (time duration) based on the number of received DRX command MAC CEs. The system transitions between different parameter states (short cycle vs. long cycle) depending on network conditions and traffic patterns, optimizing both responsiveness and energy efficiency through parameter adaptation.

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If the UE uses a long DRX cycle to conserve power, then power consumption is reduced, but data transmission delays increase

Engineering Contradiction:

Improvepower consumptionVSAvoiddata transmission delay

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The patent dynamically adjusts the DRX cycle length based on the number of DRX command MAC CEs received. When multiple CEs are received indicating active traffic, the system switches to a short DRX cycle to minimize transmission delays. When traffic is light (one or no CEs), it switches to a long DRX cycle to conserve power, thus dynamically balancing delay and power consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the DRX cycle time parameter based on received signaling. The system adapts the parameter (short vs. long cycle) according to network conditions, reducing delays when needed and saving power when traffic is light, resolving the contradiction between power consumption and transmission delay.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If the UE monitors DRX commands continuously, then data transmission efficiency is improved, but battery consumption increases

Engineering Contradiction:

Improvedata transmission efficiencyVSAvoidbattery consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic monitoring of DRX commands with variable periods. Instead of continuous monitoring, the UE monitors at intervals defined by the DRX cycle. The cycle length is dynamically adjusted: short cycles for high traffic (multiple CEs) to maintain efficiency, long cycles for low traffic (one or no CEs) to save battery. This periodic action with adaptive periods resolves the contradiction between transmission efficiency and battery consumption.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent changes the monitoring interval parameter (DRX cycle length) based on the number of received DRX command MAC CEs. The system adapts the monitoring frequency to match traffic conditions, maintaining high efficiency when needed while reducing battery consumption during low-activity periods.

Inventive Principle:

Principle #35Parameter changes

4Loss of time

If the UE uses a short DRX cycle, then data transmission delays are reduced, but power consumption increases

Engineering Contradiction:

Improvedata transmission delayVSAvoidpower consumption

Core Design Contradiction:

Loss of timeVSUse of energy by moving object

Solution Approach 1:

The patent dynamically adjusts the DRX cycle length based on the number of received DRX command MAC CEs. When multiple CEs are received indicating active traffic, the system switches to a short DRX cycle to minimize transmission delays. When traffic is light (one or no CEs), it switches to a long DRX cycle to conserve power, thus dynamically balancing delay and power consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9693383B2DRX operation in a wireless communication system

Publication Date: 2017.06.27 LG ELECTRONICS INC

AI summary

Discontinuous reception (DRX) operation in a wireless communication system is disclosed. According to this, when the UE received configuration information for a long discontinuous reception (DRX) cycle and a short DRX cycle from a network, and receive a data unit comprising at least one DRX command Medium Access Control (MAC) Control Element (CE) from the network, the UE starts using the long DRX cycle, if the data unit comprises two or more DRX command MAC CEs.