Device-to-Device Communications Enabled Energy Efficient Multicast Scheduling in mmWave Small Cells

TL;DR

This paper introduces EMS, an energy-efficient multicast scheduling scheme for mmWave small cells that leverages device-to-device communications and concurrent transmissions to reduce energy consumption and improve network performance.

Contribution

It proposes a novel EMS scheme combining D2D path planning, concurrent scheduling, and power control, with theoretical analysis and extensive simulations demonstrating its effectiveness.

Findings

EMS reduces energy consumption compared to existing schemes.

D2D communication and concurrent transmissions significantly improve multicast efficiency.

Optimal interference threshold enhances overall network performance.

Abstract

To keep pace with the rapid growth of mobile traffic demands, dense deployment of small cells in millimeter wave (mmWave) bands has become a promising candidate for next generation wireless communication systems. With a greatly increased data rate from huge bandwidth of mmWave communications, energy consumption should be mitigated for higher energy efficiency. Due to content popularity, many content-based mobile applications can be supported by the multicast service. mmWave communications exploit directional antennas to overcome high path loss, and concurrent transmissions can be enabled for better multicast service. On the other hand, device-to-device (D2D) communications in physical proximity should be exploited to improve multicast performance. In this paper, we propose an energy efficient multicast scheduling scheme, referred to as EMS, which utilizes both D2D communications and concurrent transmissions to achieve high energy efficiency. In EMS, a D2D path planning algorithm establishes multi-hop D2D transmission paths, and a concurrent scheduling algorithm allocates the links on the D2D paths into different pairings. Then the transmission power of links is adjusted by the power control algorithm. Furthermore, we theoretically analyze the roles of D2D communications and concurrent transmissions in reducing energy consumption. Extensive simulations under various system parameters demonstrate the superior performance of EMS in terms of energy consumption compared with the state-of-the-art schemes. Furthermore, we also investigate the choice of the interference threshold to optimize network performance.