Relay UE Interference Management in FeD2D Networks
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Solution Overview
Problem
In FeD2D environments, existing technologies face challenges in efficiently managing interference to ensure optimal Signal to Interference and Noise Ratio (SINR) for multiple devices sharing the same physical resources, particularly in scenarios involving wearable and Machine Type Communication (MTC) UEs, leading to inefficiencies in resource utilization and increased signaling overhead.
Innovation Solution
A method where a first relay User Equipment (UE) calculates the distance to a virtual remote UE, determines allowable interference intensity based on target SINR and signal strength, and adjusts transmission power to ensure minimal interference, allowing for simultaneous use of physical resources if the power is sufficient or switching to different resources if not, using information from Sidelink Control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple devices share the same physical resources in FeD2D environments, then resource utilization efficiency is improved, but interference management becomes complex and SINR requirements may not be met
Solution Approach 1:
The first relay UE autonomously determines its transmission power by calculating the distance to the virtual remote UE and computing the maximum allowable transmission power based on target SINR requirements, without requiring complex centralized interference coordination or extensive signaling between multiple devices
Solution Approach 2:
The system changes the transmission power parameter dynamically based on the calculated distance and target SINR requirements, allowing multiple devices to share the same physical resources while maintaining acceptable interference levels through power adjustment rather than complex resource allocation
2Reliability
If transmission power is increased to meet target SINR, then signal quality is improved, but interference to other devices increases
Solution Approach 1:
The first relay UE calculates the maximum allowable transmission power by changing the power parameter based on the target SINR requirement and the received signal strength from the second relay UE, ensuring signal quality is maintained while limiting interference generation
Solution Approach 2:
The system uses feedback from the received signal strength measurement to adjust the transmission power level, creating a closed-loop control mechanism that balances signal quality requirements with interference constraints
3Reliability
If distributed signaling is used to manage interference, then interference control is improved, but signaling overhead increases
Solution Approach 1:
The first relay UE performs autonomous interference management by independently calculating distance and determining transmission power based on target SINR requirements, eliminating the need for distributed signaling exchanges while maintaining effective interference control
Solution Approach 2:
The patent extracts the interference management function from the signaling domain and implements it locally at the first relay UE through distance-based power calculation, removing the overhead of distributed signaling while preserving interference control capability
Data Source
AI summary
A method for transmitting, by a first relay user equipment (UE), signals by considering interferences in a further enhancement D2D (FeD2D) environment comprises the steps of: calculating, by the first relay UE, a distance to a virtual remote user equipment (UE) located on a straight line between the first relay UE and a second relay UE; determining an allowable interference intensity for the virtual remote UE, on the basis of a predetermined target signal to interference and noise ratio (SINR) value for the virtual remote UE and an intensity of a received signal from the second relay UE of the virtual remote UE; determining a transmission power on the basis of the allowable interference intensity and the calculated distance; and comparing the determined transmission power with a minimum transmission power that satisfies the target SINR, wherein the virtual remote UE may be located at a threshold of a target range of the second relay UE.