D2D to B2D Connection Switching in Wireless Systems
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Solution Overview
Problem
There is a need for an efficient method to switch between device-to-device (D2D) and base station-to-device (B2D) connections in wireless communication systems, particularly to manage the transition between these connections when a user equipment (UE) is in a radio resource control (RRC) connected or idle state, to optimize communication reliability and efficiency.
Innovation Solution
A method and apparatus for switching between D2D and B2D connections by receiving and transmitting specific messages, such as B2D switch request and response messages, which include information like target devices, EPS bearer identities, RLC configurations, and logical channel identities, to control the release and establishment of connections, allowing seamless transitions between D2D and B2D modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If D2D connection is used for direct device communication, then power consumption is reduced and throughput is enhanced, but connection reliability and network control capability deteriorate
Solution Approach 1:
The patent implements dynamic connection switching between D2D and B2D modes based on real-time network conditions, device states, and service requirements. The network controller dynamically determines when to switch connections, adjusting the communication mode from direct D2D to network-mediated B2D to maintain reliability while preserving D2D efficiency when appropriate.
Solution Approach 2:
The network controller acts as an intermediary that manages and coordinates D2D connections. It provides oversight and control capabilities by receiving connection establishment requests, determining switching decisions, and managing the transition between D2D and B2D modes, thereby ensuring network control and connection reliability while allowing D2D operation.
2Productivity
If D2D connection is established for direct communication, then communication efficiency is improved, but device complexity and switching control difficulty increase
Solution Approach 1:
The network controller serves as a central intermediary that manages the complexity of D2D connection switching. It receives switching requests from user equipment, determines appropriate switching decisions based on network conditions, and coordinates the switching process, thereby reducing the control burden on individual devices while maintaining efficient D2D communication.
Solution Approach 2:
The system implements feedback mechanisms where the network controller receives status information from user equipment regarding D2D connection states, channel conditions, and service requirements. Based on this feedback, the controller makes informed switching decisions between D2D and B2D modes, optimizing communication efficiency while managing switching complexity through data-driven control.
3Adaptability or versatility
If seamless service is provided across different locations and mobility states, then service availability is improved, but network control and connection management become more difficult
Solution Approach 1:
The patent implements dynamic connection management that adapts to user equipment mobility states and location changes. The network controller continuously monitors device states and automatically adjusts connection modes between D2D and B2D based on current conditions, ensuring seamless service availability while the system handles the operational complexity of managing diverse connection states.
Data Source
AI summary
A method and apparatus for switching connection in a wireless communication system is provided. A device receives a base station-to-device (B2D) switch request message or an unsolicited B2D switch response message from a base station. The B2D switch request message or the unsolicited B2D switch response message include information on at least one of a target device, a switch unit, target D2D connection/link identifier(s), an enhanced packet system (EPS) bearer identity, a data radio bearer (DRB) identity, a radio link control (RLC) configuration, a logical channel identity, and when to switch from a device-to-device (D2D) connection to a B2D connection.