D2D Transmission Power Control for Interference Mitigation
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Solution Overview
Problem
Device-to-Device (D2D) communication in cellular systems faces interference issues such as In-Band Emission (IBE), Inter-Carrier Interference (ICI), and Inter-Symbol Interference (ISI) due to the challenges in controlling transmission power and maintaining communication range, particularly in LTE-based systems.
Innovation Solution
A method and apparatus for controlling transmission power of D2D User Equipment (UE) by receiving power control information from a base station, determining transmission power for D2D communication, and using specific radio resources to mitigate IBE, ICI, and ISI, while also employing repetitive transmission to maintain or extend the communication range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If transmission power of D2D terminal is increased to extend communication range, then communication coverage is improved, but interference to cellular system (IBE, ICI, ISI) increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmission power levels based on channel conditions, distance to base station, and interference measurements. The D2D terminal modifies transmission parameters (power, timing, frequency) to optimize communication range while maintaining interference within acceptable thresholds for the cellular system.
Solution Approach 2:
The patent implements dynamic power control where transmission power is not fixed but continuously adjusted based on real-time channel state information, feedback from the base station, and measured interference levels. This dynamic adaptation allows the system to extend communication range when conditions permit while preventing excessive interference.
2Object-generated harmful factors
If transmission power of D2D terminal is decreased to reduce interference, then interference to cellular system is reduced, but communication range is reduced
Solution Approach 1:
The patent employs periodic transmission patterns where D2D communications are scheduled at specific intervals rather than continuously. By using periodic action with appropriate duty cycles, the system reduces average interference to the cellular system while maintaining adequate communication coverage through concentrated transmission bursts.
Solution Approach 2:
The patent applies partial action by transmitting at reduced power levels during periods when cellular traffic is high or when D2D users are close to the base station, while using higher power (excessive action) when interference margins are available. This selective power adjustment balances interference reduction with coverage maintenance.
3Productivity
If D2D communication uses same radio resources as cellular uplink, then resource utilization is improved, but interference to cellular UEs occurs
Solution Approach 1:
The patent segments radio resources by dividing them into dedicated cellular uplink resources and D2D-specific resources, or by time-segmenting shared resources. This segmentation allows both cellular and D2D communications to coexist on the same frequency band with minimized interference through orthogonal resource allocation.
Solution Approach 2:
The patent introduces the base station as an intermediary that coordinates resource allocation between cellular and D2D communications. The base station acts as a mediator that schedules D2D transmissions to avoid conflicting with cellular uplink transmissions, managing resource sharing and preventing interference through centralized control.
Data Source
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AI summary
A method of controlling transmission power of a terminal performing device to device (D2D) communication in a wireless communication system, the method including receiving power control information corresponding to radio resources used for the D2D communication by the terminal from a base station, determining a first transmission power of the radio resources to be used for the D2D communication by the terminal among the radio resources, and transmitting data for the D2D communication with the determined first transmission power by using the radio resource to be used for the D2D communication by the terminal. The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services.