D2D Communication Failure Notification Mechanism
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Solution Overview
Problem
Current 3GPP standards lack specifications for effectively controlling Device-to-Device (D2D) communication, leading to compatibility issues with cellular communication.
Innovation Solution
A mobile communication system and user terminal that perform D2D communication by transmitting failure notifications to a base station when data is not received, and transmitting predetermined data or dummy data to prevent erroneous reception failure determinations, thereby enhancing communication reliability and avoiding unnecessary resource reassignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication is implemented without network control, then communication flexibility is improved, but communication reliability deteriorates due to lack of coordination with cellular network
Solution Approach 1:
The base station serves as an intermediary that coordinates between D2D communicating terminals and the cellular network. It allocates radio resources, manages interference, and ensures D2D communication operates reliably within the cellular network framework without requiring full network infrastructure for every data transmission.
Solution Approach 2:
The receiving terminal provides feedback information to the base station about reception status, and the base station uses this feedback to adjust resource allocation and interference management strategies, creating a closed-loop control system that improves communication reliability.
2Reliability
If failure notification is transmitted to base station upon reception failure, then communication reliability is improved through error reporting, but system complexity increases due to additional notification mechanisms
Solution Approach 1:
The receiving terminal autonomously detects reception failures and automatically transmits failure notifications to the base station without requiring complex external monitoring or manual intervention. The terminal serves itself by monitoring its own reception status and initiating appropriate error reporting procedures.
3Duration of action of stationary object
If data transmission continues when no data is available, then communication continuity is improved, but resource waste increases due to unnecessary transmissions
Solution Approach 1:
The transmitting terminal performs preliminary actions by transmitting dummy data or padding signals before actual data transmission begins. This ensures the communication channel remains active and ready for immediate data transfer, preventing gaps in communication continuity while the dummy data occupies minimal resources compared to complete transmission cessation.
Data Source
AI summary
In a mobile communication system comprising a first user terminal and a second user terminal, D2D communication is radio communication directly performed between the first user terminal and the second user terminal in a frequency and a time assigned from a base station. In a time in which data is to be received from the first user terminal, when the second user terminal does not receive the data from the first user terminal, the second user terminal transmits failure notification indicating reception failure in the D2D communication to the base station.