D2D Handover Reporting via Neighbor Base Station Status

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Solution Overview

Problem

In device-to-device communication, maintaining service continuity during handovers between cells that may not support D2D communication or have D2D features disabled leads to poor user experience and communication efficiency, as existing technologies lack effective mechanisms for identifying and prioritizing cells that support D2D communication.

Innovation Solution

A method involving a serving base station receiving a measurement report from user equipment, requesting and obtaining a device-to-device support status report from neighbor base stations, and determining candidate cells that support D2D communication to initiate a handover to ensure continuous D2D service by transmitting handover requests to these cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If handover to any cell is performed without checking D2D support status, then handover speed is improved, but D2D service continuity is broken

Engineering Contradiction:

Improvehandover speedVSAvoidD2D service continuity

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent applies preliminary action by having the serving base station request and receive D2D support status information from neighbor base stations before executing handover. The serving base station obtains capability information about which neighbor cells support D2D communication in advance, allowing it to select an appropriate target cell that maintains D2D service continuity while still enabling timely handover.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If D2D support status is checked for each neighbor cell, then D2D service continuity is maintained, but signaling overhead increases

Engineering Contradiction:

ImproveD2D service continuityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies feedback by implementing a mechanism where neighbor base stations provide feedback information about their D2D support status to the serving base station. The serving base station uses this feedback to make informed handover decisions, selecting target cells that support D2D communication while managing signaling overhead through efficient information exchange protocols.

Inventive Principle:

Principle #23Feedback

3Productivity

If handover to cells without D2D support is performed, then network resource utilization is improved, but user experience deteriorates

Engineering Contradiction:

Improvenetwork resource utilizationVSAvoiduser experience

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The patent applies local quality by differentiating the handover selection criteria based on the specific requirements of D2D communicating users. Instead of uniformly selecting cells based solely on network resource availability, the system identifies and selects target cells that have local quality characteristics (D2D support capability) matching the user's communication needs, thereby maintaining user experience while still optimizing network resource utilization.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS10609607B2Enhanced reporting for handover in device-to-device communication

Publication Date: 2020.03.31 MICROSOFT TECHNOLOGY LICENSING LLC

AI summary

A method, user equipment and a base station for handover in device-to-device communication are disclosed. To maintain continuity of the ongoing device-to-device communication after the handover, an enhanced reporting mechanism is introduced such that the user equipment with the ongoing device-to-device communication would be handed over to a cell of a neighbor base station that supports the device-to-device communication. In this manner, the device-to-device communication continuity may be maintained.