D2D Termination Notification Mechanism
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Solution Overview
Problem
In device-to-device (D2D) communication, user terminals do not recognize when a counterpart terminal has terminated communication without permission, leading to unnecessary processing and data transmission.
Innovation Solution
A mobile communication system where a user terminal transmits a D2D termination preliminary notification to another user terminal during D2D communication, allowing the receiving terminal to request continuity or permit termination, thus preventing unnecessary processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a user terminal unilaterally terminates D2D communication without permission, then the termination process is simple and fast, but the other terminal continues to wait and transmit data uselessly, causing resource waste
Solution Approach 1:
The terminating terminal sends a D2D termination preliminary notification to the other terminal before actually terminating the connection. This preliminary action allows the other terminal to prepare for termination by stopping data reception and waiting procedures in advance, preventing useless data transmission and reducing energy waste while maintaining a relatively simple termination process.
2Reliability
If a user terminal sends a D2D termination preliminary notification to the other terminal, then the other terminal can request continuity or permit termination properly, but the termination process becomes more complex
Solution Approach 1:
The receiving terminal responds to the D2D termination preliminary notification with a D2D continuity request, creating a feedback loop. This feedback mechanism ensures reliable termination by allowing the receiving terminal to express its continuation desire, and the sending terminal to confirm termination based on this feedback, thereby improving reliability while adding only minimal complexity through a simple request-response protocol.
3Productivity
If the receiving terminal continues to wait for data from the terminating terminal, then data transmission can be maintained, but the waiting terminal performs useless processing when the other terminal has already terminated
Solution Approach 1:
The receiving terminal receives the D2D termination preliminary notification and sends a D2D continuity request as a preliminary response. This allows the sending terminal to know in advance that the receiving terminal is still waiting, enabling the sending terminal to either confirm termination or maintain data transmission, thereby eliminating useless waiting time while preserving data continuity when needed.
Data Source
AI summary
A UE 100-1 and a UE 200-2 perform D2D communication that is direct device to device communication. The UE 100-1 transmits a D2D termination preliminary notification indicating that termination of the D2D communication is wished to the UE 100-2 during the D2D communication. The UE 100-1 terminates the D2D communication after transmitting the D2D termination preliminary notification.