Performance of Mission Critical Device To Device Communication in Rayleigh Fading Channel

Mission Critical Push To Talk (MCPTT) Device to Device Communication has been accorded necessary impetus by Third Generation Partnership Project (3GPP) for provisioning of communication and services to first responders during emergencies and catastrophes. The technology has advantages and large number of potential use cases for mission critical communication utilizing Fifth Generation (5G) infrastructure and services. The implementation of device to device (D2D) communication in 5G provides necessary low latency due to stringent key performance indicators specified by 3GPP and is achieved with changed system models and parameters. This paper reviews the advancements in mission critical device to device communication. System models for four different cases with operator and base station assisted links or dedicated communication setup between device has been discussed in paper. The mathematical expressions of signal to Noise ratio and system rate calculation have been derived. Simulation and analysis of SNR of D2D and cellular users under different scenarios with Rayleigh fading incorporating path loss model has been achieved. Analysis shows that D2D communication provides higher SNR in certain scenarios compared to cellular communication. Specifically, when two nearby devices communicate using D2D, they can achieve higher SNR than when they communicate through the base station. For devices at larger distances the SNR performance of cellular devices is better due to increased co channel interference in case of D2D users.