Wireless Base Station Handover via Pre-established Link

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Solution Overview

Problem

Conventional handover methods in wireless access networks face high processing loads on base station controllers due to the need for frequent switching of wired links between base stations, restricting the location of wireless base stations and prolonging the handover process.

Innovation Solution

Establishing a pre-existing wireless link between a wired and a wireless base station, allowing control messages and user data to be transmitted via the wired base station during handover, reducing the processing load on the base station controller and eliminating location restrictions for wireless base stations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Extent of automation

If wired links are switched between base stations during handover, then handover control can be centralized, but processing load on base station controller increases and handover time increases

Engineering Contradiction:

Improvehandover controlVSAvoidhandover time

Core Design Contradiction:

Extent of automationVSLoss of time

Solution Approach 1:

The patent establishes wireless links between base stations in advance before handover occurs. This preliminary action allows base stations to be pre-connected, eliminating the need for time-consuming wired link switching during handover and reducing processing load on the base station controller.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces wireless links as an intermediary communication path between base stations. Instead of directly switching wired connections through the base station controller, base stations communicate via wireless links, reducing the controller's processing burden and enabling faster handover.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If master and slave base stations are serially connected with wired lines, then handover can be controlled efficiently, but location of wireless base stations is restricted

Engineering Contradiction:

Improvehandover efficiencyVSAvoidlocation flexibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent replaces the mechanical wired connection system with a wireless communication system. Base stations communicate wirelessly instead of through physical wired links, eliminating location restrictions while maintaining efficient handover control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

Wireless links between base stations are established in advance, allowing the network to pre-configure communication paths without being constrained by physical wired connections. This enables base stations to be located flexibly while maintaining handover efficiency.

Inventive Principle:

Principle #10Preliminary action

3Extent of automation

If wired links are switched during handover, then centralized control is maintained, but processing load on base station controller increases

Engineering Contradiction:

Improvecentralized controlVSAvoidprocessing load

Core Design Contradiction:

Extent of automationVSPower

Solution Approach 1:

Wireless links serve as an intermediary communication channel between base stations, allowing them to exchange control information without requiring the base station controller to directly manage wired link switching. This reduces the controller's processing load while maintaining centralized control architecture.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent extracts the link management function from the base station controller and transfers it to the base stations themselves. Base stations independently manage their wireless links, removing this processing burden from the controller while maintaining overall system coordination.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS8089932B2Handover method in a wireless access network

Publication Date: 2012.01.03 MITSUBISHI ELECTRIC CORP

AI summary

When a mobile device performs a handover from a first wireless base station to a second wireless base station, a base station controller sends a control message addressed to the second base station to notify the handover, to the first wireless base station via a wired line. The first wireless base station sends received control message to the second wireless base station using a pre-established wireless line. The wireless base stations exchange a control message to control the second wireless base station, a control message to control the mobile device, and user data of the mobile device and a communication partner, using the wireless line.