Communication Apparatus Session Continuity Across Access Points

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Solution Overview

Problem

Conventional wireless LAN communication systems require re-establishing a session when switching between access points or communication methods, disrupting ongoing services.

Innovation Solution

A communication apparatus with a connection unit, detection unit, storage unit, and disconnection unit that shares and stores address and session information, allowing seamless session continuation across access point or method switches.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the access point or wireless LAN communication method is switched, then the communication apparatus can utilize different communication methods or access points, but the session established before switching cannot be continued after switching

Engineering Contradiction:

Improveability to switch access points or communication methodsVSAvoidsession continuity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The communication apparatus stores session information (including session identification, address information, and status information) in advance before switching access points or communication methods. This preliminary storage enables the session to be restored and continued after switching, rather than requiring complete re-establishment.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The session information stored in the communication apparatus acts as an intermediary that bridges the discontinuity caused by access point or communication method switching. By preserving this intermediate state information, the system can resume the session on the new access point without losing the established communication context.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the access point or wireless LAN communication method is switched, then different communication approaches can be used, but a new session must be established after switching

Engineering Contradiction:

Improveflexibility in communication methodsVSAvoidtime to establish new session

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

Session information is stored in advance before switching occurs, including all necessary parameters for session restoration. This preliminary preparation eliminates the need for time-consuming new session establishment procedures after switching.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention maintains the continuity of the session across access point or communication method switches by restoring the previous session state rather than starting a new one. This preserves the useful action of the ongoing service without interruption or time loss.

Inventive Principle:

Principle #20Continuity of useful action

3Adaptability or versatility

If the access point or wireless LAN communication method is switched, then communication flexibility is improved, but the established session is ended

Engineering Contradiction:

Improveability to change communication configurationVSAvoidsession duration

Core Design Contradiction:

Adaptability or versatilityVSDuration of action of stationary object

Solution Approach 1:

Stored session information serves as an intermediary that carries the session state through the transition period caused by switching. This intermediary information allows the session to effectively span across the switch event, maintaining its duration despite the configuration change.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The session is restored and continued after switching by using the stored session information, ensuring that the useful action of the session continues without interruption. This extends the effective duration of the session across the switching event.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS10412668B2Communication apparatus, communication method, and storage medium

Publication Date: 2019.09.10 CANON KK

AI summary

After a communication apparatus establishes a session with another communication apparatus via a first access point, the communication apparatus stores address information of the communication apparatus and the other communication apparatus, identification information of a service, identification information of the session, and status information of the session. When a condition for switching from the first access point to a second access point occurs, the communication apparatus disconnects from the first access point and connects to the second access point. The communication apparatus then establishes a session with the other communication apparatus via the second access point, using the address information of the communication apparatus and the other communication apparatus, the identification information of the service, the identification information of the session, and the status information of the session stored by a storage unit.