D2D User Terminal Scheduling for Radio Resource Overlap Prevention
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Solution Overview
Problem
In mobile communication systems, when user terminals perform D2D communication during unstable network conditions, such as disasters, there is a risk of radio resource overlap, leading to interference, which existing technologies fail to adequately address.
Innovation Solution
A mobile communication system where user terminals with a scheduling function broadcast identification messages to establish synchronization and manage radio resources, allowing for efficient assignment and management of resources without network intervention, thereby preventing resource overlap and ensuring stable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user terminals perform autonomous radio resource assignment in D2D communication during unstable network conditions, then communication reliability is improved, but radio resource overlap and interference occur
Solution Approach 1:
The system performs preliminary synchronization before D2D communication by having terminals detect synchronization signals and adjust their timing advance values in advance. This preliminary timing alignment prevents radio resource overlap during actual communication, resolving the contradiction between autonomous resource assignment and interference prevention.
Solution Approach 2:
The system implements feedback mechanisms where terminals exchange timing advance information and synchronization status. Based on this feedback, terminals can adjust their transmission timing dynamically, ensuring radio resources do not overlap even when autonomously assigned, thus maintaining both reliability and preventing interference.
2Ease of operation
If user terminals autonomously assign radio resources without network intervention, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The system enables terminals to self-assign radio resources by detecting synchronization signals from other terminals and autonomously selecting time-frequency resources based on detected timing advance values. This self-service mechanism improves ease of operation while the standardized algorithms keep implementation complexity manageable.
3Reliability
If terminals continuously search for synchronization signals, then reliability is improved, but energy consumption increases
Solution Approach 1:
The system implements periodic synchronization signal transmission and detection at predetermined intervals (e.g., every radio frame or subframe). This periodic approach maintains synchronization reliability while significantly reducing energy consumption compared to continuous searching, as terminals can enter low-power states between synchronization events.
Data Source
AI summary
A mobile communication system comprises a first user terminal having a scheduling function of assigning a radio resource used for the D2D communication. When the scheduling function is enabled, the first user terminal broadcasts periodically or aperiodically a message including identification information indicating that the first user terminal is a scheduling terminal that performs the assignment of the radio resource.