Base Station Handover Control for D2D Communication Continuity

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Solution Overview

Problem

In mobile communication systems, user terminals engaged in Device-to-Device (D2D) communication face disruptions when handover occurs to cells that do not support D2D communication, leading to interrupted services.

Innovation Solution

A mobile communication system with a base station that includes a control unit capable of managing handovers based on the D2D communication support state of target cells, ensuring seamless handover between D2D supporting cells or suspending D2D communication before handover to unsupported cells to prevent service disruptions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If handover is performed to a cell that does not support D2D communication, then the user terminal can connect to the base station, but the D2D communication is interrupted

Engineering Contradiction:

ImproveD2D communication continuityVSAvoidhandover flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The base station performs preliminary actions by determining in advance whether the target cell supports D2D communication before executing handover. The control unit checks the D2D support status of the target cell and only permits handover if D2D support is confirmed, thereby preventing D2D communication interruption before it can occur.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback mechanisms where the base station receives information about D2D support status from target cells and uses this feedback to make informed handover decisions. The control unit continuously monitors and adjusts handover permissions based on the D2D capability feedback from neighboring cells.

Inventive Principle:

Principle #23Feedback

2Reliability

If the base station controls handover based on D2D support state, then D2D communication continuity is maintained, but the control complexity increases

Engineering Contradiction:

ImproveD2D communication continuityVSAvoidhandover control complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The base station performs self-service by autonomously determining the D2D support status of target cells and making handover decisions without requiring complex external coordination. The control unit independently checks D2D support information and controls handover permissions based on this self-acquired knowledge, simplifying the overall system architecture.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If handover to non-D2D supporting cell is allowed, then network coverage is expanded, but service quality deteriorates

Engineering Contradiction:

Improvenetwork coverageVSAvoidservice quality

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system applies local quality by differentiating handover permissions based on the specific characteristics of each target cell. Cells that support D2D communication receive full handover permission, while cells that do not support D2D have restricted handover permission. This localized differentiation maintains service quality in D2D-capable areas while still allowing network expansion.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9629057B2Mobile communication system, base station, processor, and communication control method

Publication Date: 2017.04.18 KYOCERA CORP

AI summary

A mobile communication system comprises: a base station configuring a D2D supporting cell that supports D2D communication that is direct device to device communication; and a user terminal that performs the D2D communication in the D2D supporting cell. The base station comprises a control unit that controls handover of the user terminal. The control unit controls the handover on the basis of a support state of the D2D communication in a cell to which the user terminal performs handover.