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Nokia-Siemens Sets Another LTE Speed Record
Fifth Broken LTE Record in Last Six Months
by Karl Bode 08:12AM Wednesday Sep 19 2012
Nokia Siemens Networks says the company has set another world record for TD-LTE throughput speeds. According to a company press statement, NSN was able to obtain speeds of 1.6 Gigabits per second using the company's Flexi Multiradio 10 Base Station to receive and send data in simultaneous downlink and uplink connections, using 60 MHz of aggregated spectrum with an 8-pipe radio module enabling eight streams of uplink MU-MIMO. Breaking these records is becoming old hat for the company, who insists this is the fifth time that the LTE record has been broken in the last six months. NSN says they're currently conducting 16 field trials of TD-LTE globally.

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rradina

join:2000-08-08
Chesterfield, MO

How many users per cell?

60Mhz is a pretty wide channel but considering "N" technology's wide channel is 40mhz, 1.6Gpbs of actual throughput is impressive.

How many users would be served by such a cell?

Does anyone know what 8 MIMO chains does to battery life?

I wonder how it degrades when multiple users start thrashing it?

atuarre
Here come the drums
Premium
join:2004-02-14
Conroe, TX

Re: How many users per cell?

It really does not matter because you will never ever see those speeds here in the US. People will blow through their caps and rack up all kinds of overages.

RRedline
Rated R
Premium
join:2002-05-15
Attleboro, MA

Re: How many users per cell?

said by atuarre:

It really does not matter because you will never ever see those speeds here in the US. People will blow through their caps and rack up all kinds of overages.

At this speed, you can download 2 GB in 10 seconds! That wouldn't stop them from insisting that we need these low caps, though.
--
One nation, under Zod!
iansltx

join:2007-02-19
Austin, TX
kudos:2
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At those speeds, a handful of users per cell sector...with a perfect signal. MU-MIMO means that this throughput is delivered by the entire site in aggregate, not to a single user.

Eight MIMO chains won't physically fit into current devices, and my bet is that power requirements would be quite high for a device to transmit eight streams simultaneously. HOWEVER you may be able to cram all of that technology into a USB modem. Or, at worst, a fixed wireless modem like Clear uses. This last concept is intriguing, since it would allow speeds well above what current cable companies provider, over a wireless medium. The catch of course is that capacity will fall off quickly with range.

But hey, this tech can make OMGFast look slow.
rradina

join:2000-08-08
Chesterfield, MO

Re: How many users per cell?

I wasn't asking the questions as if any one user is going to get all of it. I was asking because the current wolf cry of the wireless industry is they cannot afford an all-you-can-eat buffet with the speed necessary to, say, stream good quality video. They ask us to believe that such speeds would make the network all but unusable. To bolster this argument, they meter and bill for excess use so customers put themselves on a bandwidth diet or seek free WiFi connections for bandwidth-heavy activities.

IF...and I know it's a big IF, they can give 60Mhz of aggregate bandwidth per cell and use this technique to achieve 1.6Gpbs of throughput, perhaps they can deliver 20Mbps speeds to almost 100 concurrent bandwidth hogs. If we oversubscribe that so that only 10% of the hogs are concurrent, that's almost 1,000 customers per cell getting really fast speeds. Will this ease their cries?
iansltx

join:2007-02-19
Austin, TX
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Re: How many users per cell?

AT&T and Verizon do not have spectrum assets that would allow for TD-LTE. The only company in the US that does have this spectrum in large quantities and the correct configuration? Clearwire. Who has offered unlimited access on its network since its inception.
rradina

join:2000-08-08
Chesterfield, MO

Re: How many users per cell?

My understanding is that this was an aggregate bandwidth. By that I assumed not necessarily contiguous. If they retasked the spectrum they have in the various bands, is 60mhz feasible?
iansltx

join:2007-02-19
Austin, TX
kudos:2
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Re: How many users per cell?

I can practically guarantee you that the 60MHz NSN used for the demo was one contiguous block, though it was probably (check the article) 20MHz channelized.

That said, LTE-A includes support for carrier aggregation, such that you're not limited to symmetric FD operation. This is what AT&T is counting on since they have 6MHz of 700MHz spectrum that's unpaired, and they have no good reason to deploy TD-LTE on it (but as an add-on channel for FD-LTE downlink it would work just fine).

As for "retasking" spectrum to allow for TD operation, forget about it. Doing so would require the cooperation of every single wireless carrier in a given band, would wind up creating two new band classes (the uplink frequency and the downlink frequency) and probably not net enough bandwidth advantage to be worth anyone's while. You'd have to reshuffle ownership of each band, and the owners would argue about who gets the former uplink frequencies (lower spectrum, better range) and who gets the former downlink ones (higher spectrum, lower range, no bandwidth advantage). So, for the US anyway (where spectrum is divided between a large number of entrants), it ain't gonna happen.

Band reconfiguration in other countries, where operators have 50MHz of contiguous spectrum in FD-land? Maybe.

But not here. Clearwire will probably remain the only large operator doing TD-LTE.
rradina

join:2000-08-08
Chesterfield, MO

Re: How many users per cell?

By retask I didn't mean reassign across carriers. I was referring to the current situation of multiple topologies. If and when each carrier can eliminate older topologies, would they have the spectrum holdings to aggregate the various blocks with LTE and achieve something like this or is it unrealistic to expect a client device that could transmit/receive on that many different frequencies?
iansltx

join:2007-02-19
Austin, TX
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Re: How many users per cell?

The latter. Carriers have paired holdings, primarily, and as a result they deploy FD-LTE etc. Now they can refarm from CDMA, GSM and HSPA to LTE (like MetroPCS is aggressively doing)...and there are band classes to support cellular, PCS, AWS, 700MHz and SMR FD-LTE, however the only way the spectrum use makes sense is to have one uplink path and one downlink path. Thus, FD-LTE. Channel sizes may increase as carriers push more spectrum into service on LTE, but you aren't going to see a jump from FD to TD on any of the established FD bands.