Propagation Characteristics and Deployment of Millimeter Wave Communication in Bullet Train Car

This paper deals with propagation characteristics of 60GHz band millimeter wave communication systems and technical issues on how to deploy millimeter wave enabled access points (APs) in passenger car of bullet trains. Propagation characteristics of wireless LAN system in 2.4GHz and 5GHz band deployed in car of commuter trains and in passenger car of high speed trains have been investigated. In this paper we simulated the propagation characteristics of 60GHz band by a ray tracing method and calculated how many millimeter wave access points are necessary to meet the desired throughput at all the seats in the passenger car. In order to make clear the practical issues for millimeter wave AP deployment, we also investigated how much do the following parameters such as the height level of STA, TX power level, seat occupancy rate, co-channel interference and dielectric parameter or permittivity of in car materials, affect the propagation characteristics millimeter wave communications.