Fast Inter-RAT Transition via UE-Specific Thresholds

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Solution Overview

Problem

Current wireless communication systems face challenges in achieving seamless and efficient data transmission between heterogeneous wireless communication systems, such as 3GPP LTE and Wi-Fi, particularly in fast data transitions during inter-RAT handovers, which affect the coverage and capacity of cellular networks.

Innovation Solution

A method for user-plane fast transition to a secondary radio access technology (RAT) access point is implemented, utilizing user equipment (UE) specific and data-specific thresholds, along with network preference information, to optimize interworking systems and support efficient data transmission between cellular and Wi-Fi environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If fast data transition is implemented during inter-RAT handover, then data transmission efficiency is improved, but handover interruption time increases

Engineering Contradiction:
Improvedata transmission efficiencyVSAvoidhandover interruption time
Core Design Contradiction:
ProductivityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by performing fast data transition procedures during the handover process. The system establishes data transmission paths and prepares routing information in advance, allowing data to be forwarded through alternative routes (such as via Wi-Fi access points) before the handover is complete, thereby maintaining data transmission efficiency while reducing actual interruption time.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent uses an intermediary approach by introducing a gateway or access point as a mediator during inter-RAT handover. When transitioning between cellular and Wi-Fi systems, the gateway acts as an intermediate node that forwards data packets, enabling seamless data transmission during the handover process and preventing data loss or interruptions.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Adaptability or versatility

If interworking between heterogeneous wireless systems is implemented, then network coverage and capacity are improved, but system complexity increases

Engineering Contradiction:
Improvenetwork coverage and capacityVSAvoidsystem complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies universality by designing a gateway entity that performs multiple functions across different wireless systems. The gateway can operate as both a cellular base station and a Wi-Fi access point, enabling it to handle data transmission in both cellular and Wi-Fi networks. This multi-functional approach allows the system to extend coverage and capacity across heterogeneous networks while centralizing complexity in a single versatile entity.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent uses an intermediary gateway as a mediator between cellular and Wi-Fi networks. This gateway simplifies the interworking complexity by providing a standardized interface and protocol translation layer, allowing seamless data transmission between heterogeneous systems without requiring complex integration at each endpoint.

Inventive Principle:
Principle #24Intermediary (Mediator)

3Reliability

If simultaneous transmission through primary and secondary RAT systems is implemented, then data transmission reliability is improved, but control complexity increases

Engineering Contradiction:
Improvedata transmission reliabilityVSAvoidcontrol complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies merging by consolidating control of simultaneous data transmission through primary and secondary RAT systems into a single gateway entity. The gateway combines the cellular base station and Wi-Fi access point functions, enabling it to manage data flows across both networks centrally. This unified control approach maintains transmission reliability through diverse paths while reducing overall control complexity compared to distributed management.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The gateway acts as an intermediary that manages simultaneous transmissions through both cellular and Wi-Fi systems. It performs routing decisions, packet forwarding, and protocol adaptation centrally, simplifying the control architecture while enabling reliable multi-path transmission. The intermediary handles the complexity of coordinating both networks, allowing endpoint devices to benefit from enhanced reliability without managing the complexity themselves.

Inventive Principle:
Principle #24Intermediary (Mediator)

Data Source

PatentEP2984877B1Method and apparatus for performing fast transition to an accesspoint of a secondary radio access technology in a wireless communication system
Publication Date: 2019.10.30 LG ELECTRONICS INC
  • EP2984877B1 patent drawingFigure 1~2
  • EP2984877B1 patent drawingFigure 3
  • EP2984877B1 patent drawingFigure 4

AI summary

A method for and apparatus for performing data transmission in a wireless communication system is provided. A wireless device acquires information including a threshold on an action, which is configured for a secondary radio access technologies (RAT) system, checks a condition to be triggered by the threshold and a measurement result of the secondary RAT system, performs a corresponding action according to the condition. The secondary RAT system is used for a User - Plane (U-plane) data, the threshold is changeable by at least one of a network preference including a primary RAT system or the secondary RAT system, a quality of service (QoS) information, and bearer information, the action includes whether an association/disassociation/data transition direction for the secondary RAT system is configured.