VLSI architecture based on packet data transfer scheme and its application

科研費報告書収録論文(課題番号:17300009/研究代表者:亀山充隆/システムインテグレーション理論に基づく高安全知能自動車用VLSIの最適設計

ネットワークパケット転送時間変動の事例調査

In this paper,we report some kinds of variation patterns of packet transfer delay on the Internet. We selected the round-trip paths of packet transfer from Hachinohe to Hokkaido,Hirosaki,Aomori,Akita,Iwate,Sendai, Tokyo,Kyoto,Kyusyu and Okinawa. The round-trip time(RTT)of packets are measured by using ping command executed every 30 minutes during one year of 2003. From the measurement results,we can see minimum RTT proper to each network path. Moreover,the RTT variation patterns depend on the network utilized ratio. The RTT is not so changed from midnight to early morning. On the other hand,the RTT is vastly changed from daytime to midnight on weekday. Therefore,for network application such as bilateral robot control via the Internet,we must consider the minimum RTT and the variation of RTT for each network path