D2D Discovery Signal Power Control for Cellular Interference
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Solution Overview
Problem
In wireless mobile communication systems combining device-to-device (D2D) and cellular communication technologies, the in-band emission power from D2D signal transmission causes noise interference to cellular transmissions, affecting the performance of both D2D and cellular User Equipments (UEs).
Innovation Solution
A method involving a base station and terminal communication system where configuration information for discovery resources, including time and frequency resource information and threshold signal power, is used to select an optimal discovery resource for transmitting discovery signals, thereby minimizing noise impact on cellular transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D signal transmission is performed using arbitrary transmission power, then device-to-device communication efficiency is improved, but in-band emission power causes noise interference to cellular transmissions
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmission power of D2D discovery signals based on measured reception signal power and threshold comparisons. The UE changes the transmission power parameter from arbitrary to controlled values, selecting from multiple discovery resources with different power levels to resolve the contradiction between maintaining D2D communication efficiency and reducing noise interference to cellular transmissions.
Solution Approach 2:
The patent implements feedback mechanisms where the UE measures reception signal power of discovery signals and compares it with threshold values. Based on this feedback, the UE determines whether to select the same or different discovery resources for subsequent transmissions, thereby adjusting transmission power to minimize interference while maintaining communication efficiency.
2Reliability
If multiple discovery resources are allocated for D2D communication, then discovery reliability is improved, but resource allocation complexity and interference management difficulty increase
Solution Approach 1:
The patent segments discovery resources into multiple distinct options (first and second discovery resources) with different transmission power characteristics. This segmentation allows the system to allocate multiple resources for improved discovery reliability while managing complexity through structured segmentation rather than unmanaged multiplicity.
Solution Approach 2:
The patent introduces dynamic selection among discovery resources based on real-time reception signal power measurements and threshold comparisons. The UE dynamically switches between different discovery resources (first or second) depending on channel conditions, making the resource allocation adaptive rather than static, thereby improving reliability without proportionally increasing complexity.
Data Source
AI summary
Disclosed is a method for transmitting and receiving a signal in a base station of a mobile communication system, the method including generating power control information for device to device (D2D) communication for a terminal and transmitting, to the terminal, a message including an indicator indicative of a power control mode of the terminal in accordance with the generated power control information. In accordance with a method for controlling transmit power of a terminal and a method for selecting a transmit resource in a mobile communication system, mutual interference between the D2D communication and cellular communication can be reduced, and communication efficiency improved.