Interference-Aware Resource Sharing for D2D Group Communications
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Solution Overview
Problem
In device-to-device (D2D) communications underlaying cellular networks, Co-Channel Interference (CCI) between D2D pairs and Cellular Users (CUEs) poses a significant challenge due to shared frequency resources, affecting spectrum efficiency and user access rates, especially under heavy traffic loads.
Innovation Solution
An interference-aware resource-sharing scheme is implemented, which includes initializing D2D communication requests, deciding the number of D2D pairs and CUEs, grouping D2D groups, selecting target CUEs for frequency resource sharing, applying Interference Alignment (IA), and moving excess D2D pairs to orthogonal groups to reduce interference and improve system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D pairs share frequency resources with CUEs in reusing resource mode, then spectrum efficiency and user access rate improve, but Co-Channel Interference between D2D pairs and CUEs increases
Solution Approach 1:
The patent segments D2D pairs into groups where each group shares frequency resources with a specific CUE. By dividing D2D pairs into multiple groups (first D2D pair group and second D2D pair group) with different resource sharing strategies, the system manages interference more effectively while maintaining spectrum efficiency.
Solution Approach 2:
The patent applies different resource sharing qualities to different D2D pairs based on their channel conditions and interference levels. Some D2D pairs are allowed to share resources with CUEs (higher spectrum efficiency) while others use orthogonal resources (lower interference), creating local quality variations to optimize overall system performance.
2Productivity
If multiple D2D pairs form groups to share frequency resources, then system throughput improves, but computational complexity in designing and managing groups increases
Solution Approach 1:
The patent divides D2D pairs into manageable groups (first and second groups) with different resource sharing policies. This segmentation simplifies the computational complexity by reducing the search space for optimal group formation while still achieving improved system throughput through coordinated resource sharing.
Solution Approach 2:
The patent applies interference alignment partially - not all D2D pairs use IA, but only selected groups do. This partial application reduces computational complexity while still achieving throughput improvement from the groups that do employ IA.
3Object-affected harmful factors
If D2D pairs use orthogonal frequency resources, then interference with CUEs is reduced, but spectrum efficiency and user access rate decrease
Solution Approach 1:
The patent applies different resource allocation qualities to different D2D pairs: some use orthogonal resources (lower interference) while others share resources with CUEs (higher spectrum efficiency). This local differentiation allows the system to optimize the trade-off between interference reduction and spectrum efficiency on a per-group basis.
Data Source
AI summary
A method and apparatus for an interference-aware resource-sharing scheme for multiple D2D group communications is provided. The method for interference-aware resource-sharing scheme for multiple D2D communications includes initializing a D2D communication request and deciding the numbers of D2D pairs and CUEs, grouping D2D pairs according to the decided numbers of the D2D pairs and CUEs, selecting target CUEs for the grouped D2D pairs to share frequency resources, applying interference alignment to the D2D groups, updating the set of the CUEs and D2D pairs, and moving the rest of the D2D pairs to the orthogonal group.