# Coalition Formation Games Based Sub-Channel Allocation for Device-to-Device Underlay mmWave Small Cells

## TL;DR

This paper proposes a coalition formation game approach for optimal sub-channel allocation in dense mmWave small cell networks, enhancing system sum rate for access and D2D links.

## Contribution

It introduces a novel coalition formation game model for sub-channel allocation in mmWave small cells, improving spectral efficiency and system sum rate.

## Key findings

- Achieves higher system sum rate compared to existing schemes.
- Demonstrates the effectiveness of coalition formation in dense mmWave networks.
- Provides a practical algorithm with superior performance.

## Abstract

Small cells in the millimeter wave band densely deployed underlying the macrocell have been regarded as one of promising candidates for the next generation mobile networks. In the user intensive region, device-to-device (D2D) communication in physical proximity can save power and improve spectral efficiency. In this paper, we focus on the optimal sub-channel allocation for access and D2D links in the scenario of densely deployed multiple mmWave small cells. The problem is modeled as a coalitional game to maximize the system sum rate of access and D2D links in the system. Then we propose a coalition formation game based algorithm for sub-channel allocation. Performance evaluation results demonstrate superior performance in terms of the system sum rate compared with other practical schemes.