Development of Network Emulation Technology through Collaboration of Cyberspace and Real Space

在不久的将来，我们需要在无线通信网络、移动电话网络、传感器网络和车载通信网络等多种网络之间实现灵活的互操作，以便根据周围环境、终端持有者的位置和他们的偏好提供多种类型的信息服务。在这项研究中，我们设计了一种建立城市环境中行人和车辆的真实移动模型的方法，并开发了一种低成本地实现快速评估的试验台技术。我们还开发了试验台无线电干扰情况的自动记录和采集系统。在此基础上，利用分层仿真技术，在试验台上根据获得的无线干扰情况，开发了一种用于评估异构型大规模网络服务性能的仿真技术。

In ubiquitous society of the near future, we need to realize flexible interoperability across multiple networks such as wireless communication networks, mobile phone networks, sensor networks and vehicle-to-vehicle communication networks, in order to provide several types of information services depending on surrounding environments, positions of terminal holders and their preferences. In this study, we have designed a method for building realistic mobility models of pedestrians and vehicles in urban environments, and developed a technology to achieve a test-bed for rapid evaluation with a low cost. We have also developed a system for recording and collecting automatically radio interference situations in the test-bed. Then, we have developed an emulation technology for the performance evaluation of heterogeneous large-scale network services based on the obtained radio interference situations in the test-bed using a hierarchical simulation technology.