D2D UE Transmission Power Control for Interference Mitigation
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Solution Overview
Problem
In Device to Device (D2D) communication within cellular systems, existing technologies face 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) to mitigate IBE, ICI, and ISI by receiving power control information from a base station, determining optimal transmission power, and using specific radio resources for D2D communication, while also employing repetitive transmission to maintain or extend the communication range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If transmission power of D2D UE is increased to extend communication range, then communication range is improved, but interference to cellular UEs increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmission power levels based on channel conditions, distance to cellular UEs, and network requirements. The base station configures power control parameters including target received power, path loss compensation factors, and power offsets to optimize the balance between extending D2D communication range and minimizing interference to cellular users.
Solution Approach 2:
The patent implements dynamics through continuous power control adjustments where transmission power is not fixed but adapts in real-time based on channel quality indicators, interference measurements, and base station commands. The system dynamically modifies power levels across different resource blocks and time slots to maintain optimal performance while protecting cellular UEs from excessive interference.
2Object-generated harmful factors
If transmission power of D2D UE is decreased to reduce interference to cellular UEs, then interference is reduced, but communication range deteriorates
Solution Approach 1:
The patent applies local quality by implementing spatially differentiated power control where different transmission power levels are assigned to different spatial regions and resource allocations. The base station configures power parameters specifically for D2D resource pools, allowing localized optimization where power is reduced in directions or regions where cellular UEs are present, while maintaining sufficient power for D2D communication coverage.
Solution Approach 2:
The patent segments the frequency-time resources into dedicated D2D resource pools separate from cellular resources. By dividing the available spectrum and time slots into distinct resources for D2D and cellular communications, the system can apply different power control strategies to each segment, reducing interference while maintaining D2D range through efficient resource utilization.
3Object-generated harmful factors
If repetitive transmission is used to maintain communication range with reduced power, then interference to cellular UEs is reduced, but transmission time increases
Solution Approach 1:
The patent applies periodic action through repetitive transmission of D2D signals across multiple time slots and subframes. Instead of transmitting at high power continuously, the system uses lower power transmissions repeated periodically, leveraging signal accumulation at the receiver to maintain effective communication range while reducing peak interference levels to cellular UEs.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining persistent D2D transmissions across configured resource pools with appropriate repetition patterns. The repetitive nature of transmissions in dedicated resource pools ensures continuous communication capability while the distributed timing and frequency allocation of these repetitions prevents concentrated interference to cellular users.
Data Source
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.