Selective Handoff Control for Real-Time Service Continuity

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Solution Overview

Problem

Existing seamless handoff methods between heterogeneous networks do not consider the properties of services, leading to potential deterioration of real-time services like VoIP due to interruptions or delays during handoff.

Innovation Solution

Implementing a system that selectively performs handoff based on service types, maintaining binding for real-time services on the mobile network channel when entering a wireless access zone, and performing handoff only for non-real-time services, ensuring seamless service continuity across network transitions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If handoff is performed between heterogeneous networks without considering service type, then network resource utilization is improved, but service quality deteriorates for real-time services

Engineering Contradiction:

Improvenetwork resource utilizationVSAvoidservice quality

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies local quality by differentiating handoff behavior based on service type. Real-time services (e.g., VoIP) are treated differently from non-real-time services in terms of handoff execution. The system determines service type through APN identification and applies selective handoff policies: blocking handoff for real-time services while allowing it for non-real-time services, thus optimizing both network resource utilization and service quality according to local service characteristics

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the parameter of handoff execution status based on service type classification. By identifying service type through APN (Access Point Name) and modifying the handoff parameter accordingly, the system achieves adaptive network behavior. The handoff parameter is set to blocked for real-time services and enabled for non-real-time services, resolving the contradiction between network resource utilization and service quality

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If handoff is performed for real-time services, then network flexibility is improved, but service continuity deteriorates

Engineering Contradiction:

Improvenetwork flexibilityVSAvoidservice continuity

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent applies local quality by implementing service-specific handoff policies. Real-time services are identified through APN and are excluded from handoff execution, while non-real-time services are allowed to undergo handoff. This differentiated approach maintains service continuity for real-time services while preserving network flexibility for other service types

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent inverts the conventional handoff approach by blocking handoff for real-time services instead of allowing it. This inversion of the typical handoff behavior for real-time services prevents service interruption and maintains continuity, while still allowing handoff for non-real-time services to preserve overall network flexibility

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS8804664B2Method for selectively performing handoff according to service type and system thereof

Publication Date: 2014.08.12 KT CORP

AI summary

Provided are a method for selectively performing a handoff according to a service type, and a system thereof. A home agent provides a target service to a user equipment through a mobile network channel of a mobile network. The user equipment detects entering a wireless access zone of a wireless data network while receiving the target service through the mobile network channel and determines a service type of the target service. The user equipment performs a handoff from the mobile network to the wireless data network in cooperation with the home agent when the service type is a non real-time service and refrains from performing a handoff when the service type is a real-time service.