Radio Terminal D2D Resource Allocation via Power Threshold Feedback
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Solution Overview
Problem
Current mobile communication systems face challenges in efficiently managing direct communication between radio terminals without interfering with conventional cellular communication, particularly in accurately determining the distribution of radio terminals and optimizing radio resource allocation for D2D communication.
Innovation Solution
A mobile communication system where radio terminals autonomously select and notify the base station of radio resources for direct communication, using a threshold value to manage received signal power and prevent interference, allowing the base station to accurately specify terminal distribution and allocate resources effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radio terminals perform direct communication using a part of radio resources, then user data communication efficiency is improved, but interference with conventional cellular communication increases
Solution Approach 1:
The patent divides radio resources into dedicated D2D communication resources and conventional cellular resources. By segmenting the spectrum, the system allows direct communication between terminals while preventing interference with cellular communications. The base station manages this segmentation to ensure efficient resource utilization and minimal interference.
Solution Approach 2:
The base station acts as an intermediary that coordinates between D2D communicating terminals and the cellular network. It receives reports from terminals about their communication status and uses this information to dynamically adjust resource allocation, ensuring that D2D communications do not interfere with cellular services while maintaining high efficiency.
2Adaptability or versatility
If radio terminals autonomously select radio resources for direct communication, then communication flexibility is improved, but resource allocation accuracy deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where radio terminals report their received power levels and communication status to the base station. The base station uses this feedback information to accurately assess the distribution of terminals and adjust resource allocation accordingly. This feedback loop enables both autonomous terminal selection and accurate network coordination.
Solution Approach 2:
The system dynamically adjusts resource allocation based on real-time terminal distribution and communication conditions. The base station continuously monitors feedback information and adapts its resource management strategies, allowing flexible autonomous selection while maintaining allocation accuracy through dynamic network coordination.
3Measurement precision
If the base station receives detailed reports from all radio terminals, then resource scheduling accuracy is improved, but system complexity increases
Solution Approach 1:
Instead of requiring all terminals to report all possible parameters, the patent uses partial reporting where terminals only provide essential feedback information (such as received power levels) when needed. The base station selectively requests and processes only the necessary information to determine terminal distribution, reducing overall system complexity while maintaining scheduling accuracy.
Data Source
AI summary
A radio terminal includes a receiver, a controller, and a transmitter. The receiver receives first information on radio resources for direct communication from a base station by broadcast and second information on a threshold value from the base station. The controller performs the direct communication by use of a radio resource autonomously selected among the radio resources. The receiver directly receives a radio signal from another radio terminal during performing the direct communication by use of the radio resources, and the controller compares received power of the radio signal with the threshold value of the second information. The transmitter notifies the base station of first information on the received power in response to the received power being larger than the threshold value, and does not notify the base station of the information on the received power in response to the received power being smaller than the threshold value.