"at that time, linked together." over the past 10 years since the East Japan earthquake, Softbank Corp. 's evolving disaster response-to bring IT closer to the side. Softbank Corp. News

At 02:46 on March 11, 2011, due to the massive earthquake of magnitude 7 in the Sanlu Sea area and the resulting unprecedented tsunami, serious damage was caused and many lives were lost. Ten years after that. The lessons learned from the earthquake in Japan to the east of Softbank Corp. serve as food and prepare for all kinds of disasters. I will review ten years of hard work.

Take the lessons of the Japanese earthquake in the east as food to speed up the efforts to deal with disasters.

At the time of the earthquake in eastern Japan, Kazuhiro Kobayashi, who belongs to the Tohoku Technology Department of Mobile Network headquarters (Sendai City, Miyagi Prefecture), said: "employees across the country help each other and work together as companies to carry out repair activities. I think many people have moved in the same direction, which is an unprecedented experience. In the future, we will also gather the strength of the staff to play a role, including earthquake response, "looking back at that time.

The shaking and tsunami of the East Japan earthquake, the 3786 Bureau of the Mobile Communication Base Bureau was closed, the fixed communication lines were affected by about 178, 000 lines, and the communication network in the affected area was devastating. Shortly after the earthquake, Softbank Corp. set up the disaster response headquarters to gather staff from all over the country in order to restore the line as soon as possible. In the end, 789 technical staff and 440 employee volunteers gathered to deal with it.

Then, on April 14, 2011, about a month after the earthquake, about 95% of fixed communications and mobile communications returned to the same level as before the earthquake. On September 30 of the same year, more than half a year, 99% of fixed communications were finally restored.

Out of the idea of "earlier, one day earlier, and restoring contact", Softbank Corp. 's efforts to deal with the disaster were suddenly accelerated.

As a prerequisite for rapid recovery of communication, the communication network must have high durability to disasters. As the center of the communication network, after the East Japan earthquake, the seismic strength of the building was reassessed as a design capable of withstanding magnitude 7 shaking. In addition, major network centers across the country are equipped with uninterruptible devices (batteries) and emergency generators, and power outages have been implemented to enable commercial power to operate for up to 48 hours to a maximum of 72 hours.

Moreover, the national network obtains the backup structure of each other in the eastern Japan region and the western Japan region, and the transmission network is also constructed in a ring, so even if an equipment failure occurs in one place, countermeasures such as circuitous connection can be carried out.

In addition, the East Japan earthquake caused a power outage on a large scale. If the power supply to the base station is stopped, the communication will also be interrupted. As a countermeasure of this kind of power outage, the power supply equipment which can be maintained for more than 24 hours is also set up in the base station equipment. Recently, generators capable of supplying electricity for more than 72 hours have also been introduced.

In order to prolong the running time of the base station, we installed generators and batteries and adopted electrical countermeasures. At the same time, as a countermeasure for the disconnection of the optical cable for communication introduced into the base station, a satellite antenna is set up to prepare for the maintenance of communication. "(regional restoration of the main Fengyuan Tai Xuan)

At that time, as the tsunami washed away many base stations, mobile base station vehicles, mobile power vehicles and portable base stations played an important role in urgently restoring the communication area. On this basis, the equipment of mobile base station vehicles will be enhanced to 100 and 82 mobile power vehicles. The country is equipped with 200 new portable base stations. In addition, on 11 March 2016, the tethered Balloon Wireless Relay system could be used in commercial networks by amending the legal system of the Radio Law relationship Review Standard. When the ground network is affected by disaster, the system is researched and developed as a method of temporarily restoring the communication area with tethered balloons. After the legal system is modified, the system is deployed in the main stronghold so that it can be used in the event of disaster.