D2D Mobility Management via Cell Redirection
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Solution Overview
Problem
Current wireless mobile communication systems face challenges in supporting mobility for Device to Device (D2D) communication, which limits efficient radio resource utilization and service delivery, particularly for services like Social Networking Services and advertisements.
Innovation Solution
A method is introduced for a User Equipment (UE) to detect and communicate with adjacent UEs using D2D communication, allowing it to switch between cells that do or do not support D2D, by checking system information and resource availability, and redirecting to adjacent cells that support D2D communication, ensuring seamless service delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE switches between cells that support and do not support D2D communication, then mobility is maintained, but service quality and radio resource utilization deteriorate when D2D is not available
Solution Approach 1:
The network pre-configures D2D communication parameters and resource pools in system information blocks (SIBs) before the UE needs to perform D2D communication. This allows the UE to quickly switch to D2D mode when conditions are favorable without requiring real-time negotiation, thus maintaining mobility while maximizing radio resource utilization when D2D is available
Solution Approach 2:
The system dynamically switches between cellular communication and D2D communication modes based on real-time conditions. The UE monitors D2D resource availability and automatically transitions to D2D mode when resources are available, and back to cellular mode when they are not, thereby maintaining both mobility support and optimal radio resource utilization
2Productivity
If D2D communication is implemented, then radio resource efficiency improves, but complexity of supporting mobility across cells with different D2D capabilities increases
Solution Approach 1:
The system design makes the base station and UE multi-functional by enabling them to operate in both traditional cellular mode and D2D communication mode. The base station transmits unified system information that covers both communication modes, and the UE is equipped with capabilities to handle both modes seamlessly. This universality reduces the need for separate complex mobility management mechanisms for D2D-specific scenarios
Solution Approach 2:
The base station acts as an intermediary that provides centralized control and coordination for D2D communication. It publishes D2D resource configuration information in system information blocks and manages the transition between cellular and D2D modes. This intermediary approach simplifies the complexity by centralizing the decision-making logic rather than distributing it across multiple UEs and network elements
3Productivity
If UEs use D2D communication resources, then service delivery efficiency improves, but reliability of service continuity deteriorates when moving between cells with different D2D support
Solution Approach 1:
The system implements feedback mechanisms where UEs report their D2D communication status and mobility state to the base station. The base station uses this feedback to adjust D2D resource allocation and provide handover commands that maintain service continuity. This feedback loop ensures that even when UEs move between cells with different D2D support capabilities, their service continuity is maintained through coordinated resource management
Data Source
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AI summary
Disclosed is a method of supporting/using Device-to-Device (D2D) communication supporting user equipment (UE) mobility in a wireless mobile communication system. A method and an apparatus for performing D2D communication includes receiving system information of at least one of a serving cell and an adjacent cell of the UE. The method and apparatus for performing D2D communication also includes determining whether cell redirection is required to perform the direct communication based on the system information. The method and apparatus for performing D2D communication further includes performing the cell redirection on the adjacent cell when the cell redirection is required according to a result of the determination.