100 Mbps and beyond point-to-multipoint ultra high-speed radio access system: concept and fundamental experimental results

As a MAC (media access control) protocol for ultra high-speed radio access systems that can access IP network easily and have portability, an ultra high-speed radio access protocol is proposed. The new protocol is based on packet reservation dynamic time-slotted multiple access (PR-DSMA) protocol that adopts packet reservation type protocol and that is robust against long transmission delay between up- and downlink frames caused by fiber-optic radio transmissions. We developed a prototype that includes our proposed MAC protocol with a carrier bit rate of 156 Mbps and evaluated its throughput performance. As an experimental result, throughput performances of 83 Mbps on the uplink and 64 Mbps on the downlink are obtained under a fiber-optic transmission delay of 50 km.