Development of high-speed multipath backhaul system for a terahertz wireless LAN

As the information society advances, there is a necessity for the development of communication technologies surpassing 100 Gbps to transmit rich content such as ultrahigh-definition images and large-volume sensing data to and from mobile devices over the wireless access network. To accomplish this speed, we are researching ultra-wideband wireless LAN systems utilizing the terahertz band. This system includes multipath wireless transmission technology and a wired backhaul system, which enables simultaneous transmission from multiple access points to a station. However, even if a high-speed wireless network environment is established, the transmission speed of the conventional backhaul network can become a bottleneck. While we reported the development of a prototype backhaul system with a throughput of over 100 Gbps utilizing RoCE technology, it has been found that significant overhead can occur in case of packet losses or errors in packet transmission order. In this paper, we report the development of an ultra-high-speed backhaul system that can control load distribution utilizing Data Plane Development Kit as a network application. It is confirmed by experiment that throughputs of exceeding 100 Gbps can be achieved in communication via multipath routes.