Radio Terminal Switching Notification to Wireless LAN

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Solution Overview

Problem

Current radio terminals do not effectively notify radio base stations when switching from a mobile communication network to a wireless LAN, leading to unnecessary monitoring of PDCCH, which results in inefficient resource allocation and increased power consumption.

Innovation Solution

A radio terminal and communication system that includes a controller to perform the switching process and a notification unit to inform the source radio base station when the switching condition is satisfied, thereby restraining unnecessary PDCCH monitoring by notifying the radio base station of the switching condition, allowing the radio terminal to stop monitoring unnecessary PDCCH.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the radio terminal continues to monitor PDCCH after switching to wireless LAN, then the radio base station can maintain connection context, but the radio terminal consumes unnecessary power and resources

Engineering Contradiction:

Improveconnection context maintenanceVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The radio terminal performs preliminary notification to the radio base station about the switching condition satisfaction before actually switching to wireless LAN. This allows the base station to prepare for connection release and context transfer, enabling the terminal to stop monitoring PDCCH after switching without losing connection context, thus resolving the contradiction between reliability and power consumption.

Inventive Principle:

Principle #10Preliminary action

2Use of energy by moving object

If the radio terminal notifies the radio base station of switching conditions, then unnecessary PDCCH monitoring is reduced, but additional notification signaling is required

Engineering Contradiction:

Improvepower consumptionVSAvoidsignaling complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The radio terminal autonomously determines when switching conditions are satisfied and initiates the notification to the radio base station without requiring external triggering. This self-service approach allows the terminal to take control of the switching decision and notification timing, reducing unnecessary PDCCH monitoring while managing signaling complexity through autonomous operation.

Inventive Principle:

Principle #25Self-service

3Productivity

If the radio base station releases connection context early, then resources are freed for other uses, but the radio terminal may lose connection information

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidconnection information retention

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The radio terminal provides feedback to the radio base station about the switching condition status, enabling the base station to make informed decisions about when to release connection context. This feedback mechanism ensures that the base station retains connection information until the terminal has successfully switched and notified, maintaining reliability while allowing timely resource release for improved productivity.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10182380B2Radio terminal, communication system, and radio base station

Publication Date: 2019.01.15 KYOCERA CORP

AI summary

A radio terminal 10 comprises a controller 13 configured to notify, when a condition to perform a switching process of switching a connection target from a mobile communication network to a wireless LAN is satisfied, a source radio base station provided in the mobile communication network of information indicating that the condition to perform the switching process is satisfied.