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Japan's largest operator has built a mobile network offering massive download speeds of 250Mbps.
NTTDoCoMo's network near Tokyo is only a test, but the operatorexpects to complete development of the technology next year. Commercialnetworks could follow soon after. It's pushing technical standards tothe limit in magicking out the 250Mbps speed, although it claims speedscould in theory reach 300Mbps. Upstream data can be transmitted on thenetwork at up to 75Mbps.
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The network is based on long-term evolution (LTE), an enhancement of3G and HSDPA which is using four multiple-input multiple-output (MIMO)antennae. It's a lot faster than current networks - HSDPA offers just14Mbps downstream while 3G provides a mere 384Kbps. Both those figuresare theoretical speeds - actual experiences have been far slower.
3G is available across the majority of the UK, but HSDPA is still much more limited.
As well as providing extra bandwidth, LTE has other benefits. Itshould provide less delay than 3G and it's more spectrally efficient,meaning it'll save operators like NTT a yen or two. It also works overboth 2G and 3G frequencies.
Before it's released commercially, a range of issues have to betested, including the ability of users to roam between base stationswithout losing the call.
NTT plans to give more details of its network to the Americans at atrade show on 1 April. It has dubbed LTE as both "Super 3G" and 3.9G -which looks set to cause confusion, as HSDPA has also been called Super3G