LTE base station, shield room, in -vehicle -type base station --E. Access released the Tokyo Engineering Center

On August 7, e -access has released a Tokyo Engineering Center for the media, which performs network monitoring and testing radio.The center (five -story building) is located in Koto -ku, Tokyo.E -Access purchased the original logistics warehouse and has been operating since July 2008.This time, LTE base stations, network operation center (NOC), repair center, shield room, test bed, and in -vehicle base station were guided.Shooting for repair centers and test beds was prohibited.

The LTE base station installed on the rooftop (made of Ericsson) was guided by wearing a helmet for safety.The base station consists of a base band unit (BBU), a remote radio unit (RRU), an antenna.The BBU is stored in the cabinet, where the LTE and W-CDMA signals are sent from here.Although the battery was small, it was about 6 to 7 hours during the Great East Japan Earthquake, and the explanator appealed that it could be operated with a small design and low power consumption."Other companies' base stations have been very large, and (e -access base stations) are designed (small) in other companies."The signal sent from the BBU is sent to the RRU with an optical fiber cable and is converted to an RF signal.The antenna was designed as an early model in the fall of 2011 as a field test, and is now used in commercial use.The antenna is said to contain two sectors by MIMO and cover a radius of 300 to 500 meters.

The Network Operation Center (NOC) monitors from ADSL to mobile services.In addition to Tokyo, there are similar facilities in Osaka, and it is a system that can monitor Tokyo and Osaka.The center has adopted four shifts with a two -shift shift, monitoring the network 24 hours a day, 365 days a year.If a mobile network base station has a disability, it will rush in two hours and recover in 3 hours, and at the latest, it will be completely restored within one day.We always check the "health status" of whether each base station is operated in a normal form, and can also grasp the throughput for each base station."I check the throughput for each sector, the speed of the transmission network, the operating rate, and the CSSR (a value that expresses the ease of connection of customers), and continues to operate so that it can be responded immediately after the disability occurs., No large -scale disability has been caused since the launch service started "(e -access explanation)

If a malfunction or failure occurs on the e -mobile terminal, it will be accepted at a call center and e -mobile shop, and the terminal will be delivered to the repair center.The staff will inspect and replace it if it is broken, but the feature is that it is "responding in the fastest in the industry's fastest three days.""It takes one day to go to the customer by courier, one day, one day before performing an inspection at the center and replacing it, and one day to ship it, so it can be handled in a total of three days."talk.It takes a total of five days in Hokkaido and Kyushu, so it takes a long time to deliver, but this is also the fastest in the industry.The terminal arrives about 140 units a day, reaching 3000-3500 units per month.There are about 20 resident staff, and about 35 people are enrolled in 365 days.

E-mobile terminals include data terminals, mobile Wi-Fi routers, smartphones, etc., but they say that there are no tendency to have many problems (explanatory members).However, "Smartphones are dropped and the screen is broken, Pocket WiFi carries around, so it is submerged, and the data card is carried around with a PC, so there is a declaration that the USB connector part is damaged."In addition, it seems that a terminal with a built -in battery can be "replaced only by replacing the battery".Sometimes it is sent to the manufacturer to repair it, and it is said that "the manufacturer may inspect the contents and replace the housing with a new one in some cases."In that case, it takes about 3-4 days, and it is about 10 days at most.When the manufacturer is repaired, the amount changes, so the manufacturer needs to be repaired and the estimated amount to the user, and then asks the manufacturer when the go -sign comes out.

A shield room that completely blocks radio waves is used for testing a terminal that has not received a technical standard conformity (technical) or testing a radio wave that is not officially assigned.This time, the communication speed test was performed using "Pocket Wifi LTE (GL04P)".The GL04P is compatible with the LTE "UE Category4", which achieves a speed of up to 150Mbps down by using a band of 20MHz, but e -access is currently 1..It has only 15MHz width in the 7GHz band.Therefore, in this test, the shield room actually used a 20MHz width and tested how fast it would be.The base stations and antennas are used in the same room where the shield room is installed.In the test, the speed of 139Mbps, which is close to the theoretical value, was out.

According to the explanator, the test is performed in accordance with the standard of 3GPP, but to keep connecting to see the stability of communication, or see if there is no problem even if it is used for a long time in the load test.It may be more than 10 hours in the shield room.In addition, test items are more than 10,000."There are cases where it is OK if you do 10 times and clear 9 times, or if 90 % of the theoretical value comes out, it is OK. There is also a test here to handover from W-CDMA to LTE.(Explanator).The bandwidth can be adjusted, and it can be changed to 5MHz, 10MHz, 15MHz, 20MHz width.It seems that the size of the shield room has not been determined.

Test beds for verifying radio -related equipment, such as exchanges and network infrastructure, have been released.The Huawei RRU, which was introduced here, supports UMTS (W-CDMA) and LTE, and is going to verify it.It features a small size that is not much different from the iPad, and weighs about 8..5 kilograms.It is compatible with 2 × 2 MIMO, and power consumption is also reduced.Although it is mainly used indoors because of its small size, the explanation said, "Because the coverage may be small, it will be useful when you want to take out outdoor spots."In the room, Huawei engineers and e -access staff were just verifying.At the end of the verification, a formal contract will be signed, and other telecommunications carriers will be able to expand commercially.

Finally, an in -vehicle base station of E -Mobile was also released.All two units in Tokyo are all, and the operation has been started from "FUJI ROCK FESTIVAL'12" and "Rock in Japan Festival 2012" held the other day.We will focus on events that are expected to congestion in communication, but of course we will give priority to dispatching to the stricken area in the event of a disaster.It is said that the point has just begun, and the point is that it supports LTE.The network is drawn in a wired cable or with satellite communication.The antenna extends to 8 meters, and it is a pump type that does not use electricity so that it can be stretched without the engine.This antenna covers a radius of 500 meters to 1 kilometer.In -vehicle batteries last for about 60 hours.For the power supply, a small generator in the lower part is used, and a plug is provided to use an external power supply.Starting with these two units, e Access will continue to increase the number of in -vehicle base stations.