D2D Frequency Mapping for Service Quality
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Solution Overview
Problem
Current mobile communication systems face challenges in ensuring a predetermined level of service quality for specific device-to-device (D2D) applications, such as public safety and vehicle-to-vehicle communication, due to the lack of efficient frequency mapping and management in D2D proximity services.
Innovation Solution
A user terminal, service control apparatus, and base station are designed to obtain and manage mapping information that correlates D2D applications with appropriate frequencies, enabling the determination and notification of optimal frequencies for D2D communication, thereby ensuring high service quality by prioritizing frequency selection and handover processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency mapping and management is implemented for D2D applications, then service quality is improved, but system complexity increases
Solution Approach 1:
The patent introduces a service control device as an intermediary component that centrally manages frequency mapping for D2D applications. This mediator receives frequency mapping information from the network and distributes it to user terminals, thereby improving service quality through systematic frequency management while containing system complexity by centralizing the management function rather than distributing it across all devices.
2Object-affected harmful factors
If multiple frequencies are allocated for different D2D applications, then interference is reduced, but frequency resource management complexity increases
Solution Approach 1:
The patent applies segmentation by allocating different frequencies to different D2D applications (e.g., public safety applications, vehicle-to-vehicle communication). This segmentation of frequency resources reduces interference between applications by assigning them separate spectral resources. The service control device maintains a mapping table that segments frequency allocation by application type, achieving interference reduction while managing complexity through structured organization.
3Reliability
If frequency mapping information is obtained from service control device, then service quality is ensured, but communication overhead increases
Solution Approach 1:
The patent implements preliminary action by having the service control device prepare and store frequency mapping information in advance in a mapping table. When a user terminal needs to establish D2D communication, the frequency mapping information is already available at the service control device, allowing quick retrieval and notification to the terminal. This preliminary preparation ensures service quality is maintained while minimizing communication overhead during actual D2D establishment.
Data Source
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AI summary
A user terminal according to a first aspect is used in a mobile communication system which supports a D2D proximity service for enabling direct device-to-device communication. The user terminal comprises a controller configured to obtain mapping information indicating a correspondence relationship between a D2D application and a frequency to be used for the D2D application, the D2D application being an application of the D2D proximity service. The controller determines the frequency to be used for the D2D application based on the mapping information.