D2D Power Allocation for Cellular Interference Control
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Solution Overview
Problem
Current D2D communication systems face challenges in managing inter-cell interference (ICI) and optimizing resource allocation, particularly in multi-antenna networks, where existing algorithms fail to maximize the sum rate of cellular and D2D devices while limiting ICI in neighboring cells.
Innovation Solution
A method and apparatus that configure D2D pairs and cellular wireless devices by determining power allocation based on Channel State Information (CSI) and interference levels, using beamforming and power control to optimize the sum rate and limit ICI, allowing for efficient resource sharing and scheduling across shared Physical Resource Blocks (PRBs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D users share cellular resources to improve spectral efficiency, then resource utilization improves, but interference to cellular users increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting D2D transmission power levels based on channel conditions, interference measurements, and quality of service requirements. The base station controls D2D power parameters to maximize spectral efficiency while maintaining cellular user performance through continuous parameter optimization.
Solution Approach 2:
The system implements dynamic resource allocation where D2D and cellular resources are not fixed but adaptively assigned based on real-time network conditions. The base station continuously adjusts resource block assignments and power levels dynamically to balance spectral efficiency gains with interference control.
2Reliability
If D2D transmission power is increased to improve communication reliability, then reliability improves, but inter-cell interference increases
Solution Approach 1:
The patent implements parameter changes by adjusting D2D transmission power levels based on channel state information, interference measurements from neighboring cells, and quality of service requirements. The base station optimizes power parameters dynamically to achieve reliable communication while controlling inter-cell interference through continuous parameter adaptation.
3Productivity
If beamforming is used to improve SINR at the base station, then spectral efficiency improves, but the system complexity increases
Solution Approach 1:
The base station acts as an intermediary that performs beamforming operations on received signals from multiple antennas before processing. By introducing the beamforming stage as an intermediary processing step, the system achieves improved SINR and spectral efficiency while managing complexity through centralized base station processing rather than distributed device complexity.
4Productivity
If power allocation is optimized to maximize sum rate, then throughput improves, but the computational complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the power allocation problem into separate optimization sub-problems for cellular users and D2D users. The base station independently optimizes power levels for each user group based on their respective channel conditions and requirements, reducing overall computational complexity compared to joint optimization while maintaining throughput performance.
Data Source
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AI summary
A method and network node for configuring a device-to-device (D2D) pair and a cellular wireless device, the cellular wireless device configured to have a direct link with a serving network device of a network cell in which the cellular wireless device resides. The method includes receiving Channel State Information (CSI) data for the D2D pair, a cellular wireless device, and at least one neighbor interference level, determining feasibility conditions for pairing the D2D pair and the cellular wireless device transmissions, determining a power allocation for the pairing of the D2D pair and cellular wireless device transmissions, the power allocation being based on a sum rate of the D2D pair and cellular wireless device transmissions, and configuring the D2D pair and cellular wireless device based at least in part on the determined power allocation.