A dual mode approach based efficient relay-aided device-to-device communication in 5G mm-Wave cellular network

Area of Science:

• Wireless Communication
• Telecommunications Engineering
• Signal Processing

Background:

• Device-to-device (D2D) communication enhances network capacity and coverage.
• Integrating D2D with cellular networks in 5G mm-Wave presents interference challenges.
• Quality of Service (QoS) is a key metric in modern wireless networks.

Purpose of the Study:

• To propose and evaluate a dual-mode (direct and relay) communication scheme for coexisting D2D and cellular users in a 5G mm-Wave network.
• To minimize interference between D2D and cellular communications.
• To analyze the spectral efficiency (SE) and energy efficiency (EE) of the proposed scheme.

Main Methods:

• A dual-mode scheme utilizing direct communication at 2 GHz and relay communication with full duplex amplify and forward (FDAF) at 28 GHz.
• Stochastic geometry is employed to derive closed-form expressions for SE and EE.
• Probability distribution function (PDF) and cumulative distribution function (CDF) were derived for performance analysis.

Main Results:

• The relay mode demonstrated superior performance in terms of SE and EE compared to the direct mode.
• Energy efficiency increased with D2D transmit power, reaching approximately 180 Mbps/J.
• Average data rate improved to around 135 Kbps at a D2D power of 250 mW with pathloss attenuation of 2.5.

Conclusions:

• The proposed dual-mode scheme effectively manages interference in underlaying 5G mm-Wave networks.
• Relay-aided D2D communication offers significant improvements in network performance.
• Simulation results validate the proposed scheme's efficacy and superior performance over existing methods.