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4Testbed operations and demonstration experiments4.1Testbed operations and demonstration experiments in an urban environment: Odaiba Rainbow Bus (Minato City, Tokyo)We chose the Odaiba area—in which the Odaiba Rainbow Bus service operates—as our urban environment setting and set up our testbed there. A schematic diagram of the testbed established around the Odaiba Rainbow Bus route is shown in Fig. 5. Seven Odaiba Rainbow buses operate along the route which starts from Shinagawa Station or Tamachi Station, crosses the Rainbow Bridge and goes through the Odaiba area. Eleven 20 mW signage terminals were installed in seven buses, the Minato City Oce and other facilities in the Odaiba area, including the Fuji Television Building. Tall buildings in the urban envi-ronment block radio waves and cause multipath propaga-tion. Community buses typically operate in this type of environment. We conducted an information sharing ex-periment in this urban setting in which information was collected and distributed between the Odaiba Rainbow buses and the facilities around the Odaiba area. e fol-lowing information was collected and diused in our ex-periment: Minato City government information, Fuji TV news, event information for the Grand Nikko Tokyo Daiba and trac information from the KM Kanko Bus [13]. Because these buses did not travel in areas near the Minato City Oce, we made an arrangement so that the informa-tion from the Minato City Oce was transmitted via the Internet to the signage terminal at the Fuji Television Building. e terminal then transmitted the information to the buses. We conrmed that the information was fre-quently updated as the Odaiba Rainbow buses traveled periodically along the route.In addition, we also conrmed that the ve rooop terminals established a communication link across the sea area (Fig. 5). e ve rooop terminals installed with 250 mW communication devices were powered by solar cell systems. Links were established between them for emergency use. Although the transmission frames designed for these links were only able to transmit a smaller amount of information than those transmitted to and from buses, they were capable of fast transmission. An example of the transmission frame is illustrated in the next section. We also established communication links using the rooop terminals which enabled emergency transmission from the Minato City Oce.4.2Testbed operations and demonstration experiments in a suburban environment: Seika Kururin Bus (Seika Town, Kyoto)We chose Seika Town—in which the Seika Kururin Bus service operates—as our suburban environment setting and set up our testbed there. A schematic diagram of the test-bed established around the Seika Kururin Bus routes is shown in Fig. 6. We installed eight signage terminals, eight rooop terminals and six sensor terminals in the area. As HotelFuji TelevisionLegend:OdaibaRainbowBus routeSignage terminalRooftop terminalKM Kanko OfficeOdaibaGakuenShibaura Building No.1Shinagawa stationTamachistationAtagoMori TowerMinato City Officevia internetMinato Resource Recycle CenterCity Heights KonanFiF5　Testbed established around the Odaiba Rainbow Bus route2 Terrestrial Communication Technology Research and Development48　　　Journal of the National Institute of Information and Communications Technology Vol. 64 No. 2 (2017)