Carrier Aggregation Scheduling for Packet Reordering Density

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Solution Overview

Problem

Carrier aggregation in wireless communication networks often results in data packets being received out of order at wireless devices due to varying activation times of carrier components, leading to packet reordering and potential retransmissions.

Innovation Solution

A method is introduced where a wireless access node determines the packet reordering density based on factors like DRX cycle asymmetry, traffic burst levels, and resource asymmetry, and adjusts the carrier aggregation configuration to ensure packets are scheduled and received in the correct order by transitioning to a second configuration that aligns data distribution with the timing of control signals and available resources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If carrier aggregation is used to increase bandwidth and bitrate, then data transmission capacity is improved, but packet reordering occurs due to varying activation times of carrier components

Engineering Contradiction:

Improvedata transmission capacityVSAvoidpacket delivery order

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary action by determining the asymmetry value of DRX cycles and identifying packet reordering density before generating the second carrier aggregation configuration. This advance analysis allows the system to proactively adjust scheduling parameters to prevent packet reordering issues before they occur, rather than reacting after packets are already misordered.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamics by dynamically adjusting the carrier aggregation configuration based on real-time conditions. The system transitions from a first carrier aggregation configuration to a second configuration based on measured asymmetry values and reordering density, making the scheduling adaptive rather than static. This allows the system to optimize packet ordering while maintaining high data transmission capacity.

Inventive Principle:

Principle #15Dynamics

2Use of energy by moving object

If devices power up and power down antennas to conserve battery, then energy consumption is reduced, but carrier aggregation communications are received out of order

Engineering Contradiction:

Improvebattery consumptionVSAvoidcommunication reception order

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent applies feedback by continuously monitoring DRX cycle asymmetry and packet reordering density, then using this information to adjust the carrier aggregation configuration. The system measures the actual impact of antenna power management on packet ordering and feeds this information back into the scheduling decision, creating a closed-loop system that balances battery conservation with reliable communication.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent implements parameter changes by modifying carrier aggregation scheduling parameters based on the identified reordering density. When high reordering is detected, the system adjusts scheduling parameters in the second configuration to compensate for the asymmetric DRX cycles caused by battery-powered antenna management, thereby maintaining packet order despite energy-saving operations.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If packets are received out of order, then retransmission requests are generated, but network resources are wasted

Engineering Contradiction:

Improvedata throughputVSAvoidnetwork resource waste

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent applies preliminary action by identifying packet reordering density and determining asymmetry values before generating the adjusted carrier aggregation configuration. This advance detection allows the system to prevent retransmission requests from being generated in the first place, rather than dealing with the consequences after packets are already misordered and retransmission is needed.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent converts the harmful effect of asymmetric DRX cycles into a benefit by using the measured asymmetry value and reordering density to optimize the carrier aggregation configuration. What would normally cause packet reordering and waste network resources is instead used as diagnostic information to adjust scheduling parameters, turning the problem into a basis for improved resource allocation.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS9655104B1Carrier aggregation scheduling based reordering density

Publication Date: 2017.05.16 T MOBILE INNOVATIONS LLC

AI summary

Examples disclosed herein provide systems, methods, and software to limit the reordering of data packets at a wireless communication device during a communication. In one implementation, a wireless access node may measure reordering density factors related to component carriers providing a communication. Based on the reordering density factors, the access node may determine a packet reordering density, which is related to the number of packets that would be received by the wireless communication device in an undesirable order. Upon determining the packet reordering density, the wireless access node determines whether the density meets criteria and, if the density meets the criteria, generates a second carrier aggregation configuration based on available resources the component carriers.