D2D Discovery Controller Out-of-Coverage Identification
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Solution Overview
Problem
In mobile communication systems, existing technologies face challenges in efficiently performing Device-to-Device (D2D) discovery procedures among user terminals located outside of cell coverage, where direct device-to-device communication is necessary without network involvement.
Innovation Solution
A user terminal equipped with a controller that executes a D2D discovery procedure using pre-configured D2D data resources, transmitting identification information within a MAC subheader or time-frequency resource pool to differentiate between communication and discovery data, ensuring efficient D2D communication in out-of-coverage scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D discovery procedure is executed using pre-configured D2D data resources outside cell coverage, then D2D discovery capability is enabled in out-of-coverage scenarios, but resource pool confusion and discovery efficiency deteriorate due to lack of clear identification between communication data and discovery data
Solution Approach 1:
The patent applies the principle of 'Color changes' by introducing identification information that acts as a marker or indicator to distinguish discovery data from communication data in the shared resource pool. This identification information enables receiving terminals to quickly identify and process discovery data without confusion, thereby maintaining high discovery efficiency while enabling D2D discovery capability in out-of-coverage scenarios.
2Productivity
If D2D data resources are shared for both communication and discovery purposes, then resource utilization is improved, but data identification complexity increases due to need to differentiate between communication and discovery data
Solution Approach 1:
The patent applies the principle of 'Preliminary action' by pre-configuring identification information together with the D2D data resources in the resource pool. This preliminary marking of data packets with identification information allows terminals to automatically and efficiently distinguish between communication data and discovery data during reception, reducing the complexity of real-time data identification while maintaining high resource utilization.
3Measurement precision
If identification information is transmitted to differentiate data usage, then data differentiation accuracy is improved, but transmission overhead increases due to additional identification information
Solution Approach 1:
The patent applies the principle of 'Merging (Combining)' by integrating the identification information with the existing D2D data structure in the shared resource pool. The identification information is combined with the data payload in a unified transmission format, allowing simultaneous transmission of both discovery/communication data and its identification marker without requiring separate dedicated resources, thereby achieving accurate data differentiation while minimizing transmission overhead.
Data Source
AI summary
A user terminal is used in a mobile communication system configured to support Device to Device (D2D) communication that is direct device-to-device communication. The user terminal comprises a controller. The controller is configured to, if determining to execute a D2D discovery procedure targeted to a user terminal out of a cell coverage, execute the D2D discovery procedure by using a D2D data resource in a pre-configured resource pool for D2D communication. The controller is configured to execute, upon executing the D2D discovery procedure, a process of transmitting identification information indicating that data carried by the D2D data resource is used for the D2D discovery procedure.