Since it became possible to Internet with the N 700 series Shinkansen so I tried it immediately ~ uphill descending simultaneous use speed report edition ~

From early in the morning, headed to Tokyo for the first episode, enjoying the N700 series wireless LAN net connection service just started todayMeasure download speed,furtherI measured the radio field intensity on each vehicleAlthough this is the case, it is between Tokyo and Shin - Osaka this time. Since there is no trick to simply measure down only simply, this time I tried to measure both down and up simultaneously using two laptops.

As a test method, downlink is measured on the first notebook computer, and upload is measured for the second notebook computer. The method is the same as last time, file transfer between FTP server and local computer. In addition, this time it has become a graph from Shinagawa practically at software misconfiguration (it became impossible to log in to the wireless LAN for the first time only). As a result, descent was able to be started as soon as possible, but the upload is slightly delayed. However, this resulted in success, and as a result, the characteristic has come to be seen as a surprising weak point in the wireless LAN service of this bullet train.

The upward and downward simultaneous use speed report editing like what you have done all the way to go is from below.
16 o'clock
2009/03/14 16: 08Arrived at Shin - Yokohama. The down stream is about 30 KB / sec. Upstream is around 85 KB / sec.
2009/03/14 16: 12, On the way back, unlike the first episode, the number of users is large, or the speed does not go out as much as possible, the downhill is around 30 KB / sec.
2009/03/14 16: 13, Despite recovering down to 50 KB per second, it also decreased to about 30 KB per second. Upstream is between 70 KB and 80 KB per second.

Or, what is this descending graph ...? Regularity as if controlled intentionally. Whether this guess is correct or wrong will be known later.


■ 16: 15
2009/03/14 16:19Finally, descending is 0 KB per second, and upstream is around 80 KB per second.
2009/03/14 16: 21, Descending is unstable, about 10 KB - 30 KB / sec. Upstream is stable at 80 KB / sec.
2009/03/14 16: 24, Passing Odawara station, downhill is 50 KB / sec, upstream is over 60 KB / sec. Are somehow adjusted up to 110 KB in total with uplink and downlink?
2009/03/14 16: 27, Tunnel rush. Downstream 60 KB per second, upstream 50 KB per second.

Graph for the last 15 minutes, descent


Graph for the last 15 minutes, upstream


16: 30
2009/03/14 16: 31, Once again a long tunnel group, descending at 30 KB / sec, uploading stable at 80 KB / sec. It seems that the way of ascending is always given priority regardless of how it looks.
2009/03/14 16: 36, Mishima station, 40 kilobytes per second downhill, 60 KB - 70 KB per second upstream.
2009/03/14 16: 41, Passing through Shin-Fuji Station. The downlink is 40 KB per second, and the upload is 70 KB to 80 KB per second.
2009/03/14 16: 43, A long tunnel, the down stream is around 30 KB / sec, the upload is stable at around 80 KB / sec.

Graph for the last 15 minutes, descent


Graph for the last 15 minutes, upstream


Graph in the last 30 minutes, descent


Graph in the last 30 minutes, upstream


■ 16:45
2009/03/14 16: 49, Passing through Shizuoka station, downhill is 60 KB / sec, uploading is 70 KB / sec. Did you speed up a bit?
2009/03/14 16: 59Pass through Kakegawa station. Downstream per second 70 KB, Upstream is around 40 KB / sec. By chance, descent suddenly exceeded, but in most cases the time when the descent is late than the ascending is longer.

Graph for the last 15 minutes, descent


Graph for the last 15 minutes, upstream


Graph in the last 30 minutes, descent


Graph in the last 30 minutes, upstream


Last 1 hour graph, descent


Graph for the last hour, upload


17 o'clock
2009/03/14 17: 03, Go up and down equally at around 60 KB per second.
2009/03/14 17: 04, Pass the Tenryu River, downhill to 30 KB / sec, upstream to 70 KB / sec.
2009/03/14 17: 06Pass through Hamamatsu station, downhill at around 50 KB / sec, upload at around 60 KB per second.
2009/03/14 17: 10Passing through Lake Hamana, downhill is 30 KB / sec, uploading is 80 KB / sec.

Graph for the last 15 minutes, descent


Graph for the last 15 minutes, upstream


Graph in the last 30 minutes, descent


Graph in the last 30 minutes, upstream


Last 1 hour graph, descent


Graph for the last hour, upload


■ 17: 15
2009/03/14 17:18, Rushed into the tunnel, downhill is 30 KB / sec, upstream is about 70 KB / sec. Since there is no one else who is communicating with other people even if you look around the vehicle, it is probably the most up-to-date total of up to 110 KB / s, which is almost certain.
2009/03/14 17: 24, Pass the Mikawa Anjo station. 20 kilobytes per second down, 40 kilobytes per second upstream, to an unprecedented delay.

Graph for the last 15 minutes, descent


Graph for the last 15 minutes, upstream


Graph in the last 30 minutes, descent


Graph in the last 30 minutes, upstream


Last 1 hour graph, descent


Graph for the last hour, upload


Graph for the last 3 hours, descent


Graph for the last 3 hours, upstream


■ 17: 30
2009/03/14 17:33, Nagoya station arrival, descending is around 10 KB / sec, upload is around 90 KB / sec. Although it is unknown what kind of circumstances the priority will be given in terms of convenience, it seems clearly that the upward direction is set higher in priority.
2009/03/14 17:38Beginning to move with a laptop in charge for descending to the direction of a little bit. I will try to move to another vehicle as to whether I can release the curse of 30 KB / sec.
2009/03/14 17: 39, Feeling that it hands over between the vehicle and the vehicle and it gets shattered. When it cuts, it connects, and when it cuts, it repeats the connection. The time of handover is unknown, but it may take up to 30 seconds, and in some cases it may change over.
2009/03/14 17: 40, The speed does not get much speed during handover. However, in vehicles with speed, 70 KB ~ 80 KB will be out.

Graph for the last 15 minutes, descent


Graph for the last 15 minutes, upstream


Graph in the last 30 minutes, descent


Graph in the last 30 minutes, upstream


Last 1 hour graph, descent


Graph for the last hour, upload


Graph for the last 3 hours, descent


Graph for the last 3 hours, upstream


■ 17: 45
2009/03/14 17: 49, While the descent laptop computer was absent, the laptop computer continued to maintain steadily near 80 KB / 90 KB per second. As soon as the descent notebook computer came back, the battlefield started to rush again. In other words, when multiple people use one vehicle, it is apparent that the pull-in starts obviously.
2009/03/14 17: 53, Passed the Maibara station. 30 kilobytes per second for uplinks and 60 kilobytes per second for uploads.

Graph for the last 15 minutes, descent


Graph for the last 15 minutes, upstream


Graph in the last 30 minutes, descent


Graph in the last 30 minutes, upstream


Last 1 hour graph, descent


Graph for the last hour, upload


Graph for the last 3 hours, descent


Graph for the last 3 hours, upstream


18 o'clock
2009/03/14 18: 05, Down to 3 KB per second. Uphill is about 80 KB per second and it is Gokigen.
2009/03/14 18: 12, Arrived at Kyoto Station. 20 kilobytes down to 60 kilobytes per second down. Upstream is unstable at 60 KB / 80 KB / sec.

Graph for the last 15 minutes, descent


Graph for the last 15 minutes, upstream


Graph in the last 30 minutes, descent


Graph in the last 30 minutes, upstream


Last 1 hour graph, descent


Graph for the last hour, upload


Graph for the last 3 hours, descent


Graph for the last 3 hours, upstream


■ 18: 15

It is almost obvious if I come to this far. Upstream priority, downhill and uphill struggle to happen.

Graph for the last 15 minutes, descent


Graph for the last 15 minutes, upstream


Graph in the last 30 minutes, descent


Graph in the last 30 minutes, upstream


Last 1 hour graph, descent


Graph for the last hour, upload


Graph for the last 3 hours, descent


Graph for the last 3 hours, upstream


■ 18: 26
2009/03/14 18: 26, Arrived in Shin - Osaka.

Graph, descent, final for the last 3 hours. Finally I received 360.68 MB.


Graph, Up, Final for the last 3 hours. Finally I could transmit 614.52 MB.


A slight mistake and accident caused the speed measurement test start to shift on the ascending and descending, but as a result, it is obvious that the upward takes precedence and it is the maximum 2 Mbps per train (256 KB / sec), but one vehicle It seems that it is limited to 110 KB per second at the maximum of one access point or about 110 KB per second, plus up and down as well.

Therefore, although it is absolutely necessary to get down speed, if there is no speed for some reason, it may be that you will move to the vehicle with speed.

Also, it is noteworthy that the connection will not break even at low speed anyway. If it is a communication card of another carrier, there are times when it can be blown out and the stress accumulates, but it is important to say that not being cut off even at low speed is stress. It seems that continuous communication like this test occurs rarely, so it seems that it will be a sensible speed with almost no problem when actually using it.