Kenzaburo Fujishima

Field tests of space-time packet scheduler with exchanging beam schedule information

To evaluate the feasibility of the proposed space-time packet scheduler (STPS), the test bed including two experimental access points (AP) was constructed in a suburban area. Two effects of proposed STPS were confirmed through the field tests. One of them is that inter-AP interference decreases by the proposed scheduler, and a high-quality communication is possible even if access terminal is present in the environment of strong inter-AP interference. The other one is that the packet collision ratio in downlink reduces from about 23% to less than 1%.

A study of space-time packet scheduler with exchanging beam schedule information

A novel technique to reduce inner and inter cell interference for the cellular packet data transmission on the downlink is proposed. In this method, the base transmission station (BTS) has a space-time scheduling which uses beam schedule information of adjacent cell BTS. This method drastically improves frequency efficiency by suppression of inter-cell interference. According to the simulation results, the frequency efficiency of a twelve-beam array antenna system can be improved on by eighty percent compared to the scheduling without using beam schedule information.