Base Station Handover Access Mode Feedback

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Solution Overview

Problem

Existing proposals for handover of mobile devices between home base stations operating in different subscriber group access modes (closed and hybrid) do not adequately address the need for access control and data rate management, leading to potential service disruptions for CSG members.

Innovation Solution

Implement a method for handover between base stations operating in different subscriber group access modes by transferring a communication link and transmitting data indicating the subscriber group access mode of the target base station to the core network, ensuring seamless handover and maintaining service quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a mobile device is handed over between home base stations operating in different subscriber group access modes (closed and hybrid), then handover efficiency is improved, but access control and service quality for CSG members deteriorate

Engineering Contradiction:

Improvehandover efficiencyVSAvoidaccess control and service quality

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The target base station provides feedback to the MME about its access mode (closed, hybrid, or open) through the handover execution message. This feedback mechanism enables the MME to update the UE context with the correct access mode information, ensuring proper access control and service quality management for CSG members during handover between base stations with different access modes.

Inventive Principle:

Principle #23Feedback

2Speed

If the MME does not perform access control for handover between HNBs of the same CSG, then handover speed is improved, but service disruption for CSG members increases

Engineering Contradiction:

Improvehandover speedVSAvoidservice continuity for CSG members

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The target base station performs preliminary action by including its access mode information in the handover execution message sent to the MME before the actual handover is completed. This allows the MME to prepare and update the UE context with the correct access mode in advance, ensuring that access control is maintained without delaying the handover process.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If access mode information is not updated in the MME during handover, then handover complexity is reduced, but data rate management for non-members deteriorates

Engineering Contradiction:

Improvehandover processing complexityVSAvoiddata rate management for non-members

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The handover execution message acts as an intermediary carrier that transmits access mode information from the target base station to the MME. This intermediary mechanism allows the MME to receive and process access mode information without adding significant complexity to the handover procedure, while enabling proper data rate management for non-members by updating the UE context with the target base station's access mode.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12309687B2Communication system

Publication Date: 2025.05.20 NEC CORP

AI summary

A base station for communicating with a mobile station, the base station including a processor configured to generate, when the base station is operating as a target base station, a path switch request, and a transceiver circuit configured to transmit, when the mobile station is engaged in a handover to the base station when operating as a target base station, the path switch request to a Mobility Management Entity (MMB), wherein the path switch request includes a closed subscriber group (CSG) access mode of the base station operating as a target base station.