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Faster T-Mobile LTE Arrives in Dallas
by Karl Bode 08:04AM Friday Dec 13 2013
T-Mobile has deployed a 20x20 MHz LTE network in Dallas, providing improved capacity and faster speeds as the company moves to offer wider channels around the country. According to All Things D, T-Mobile turned on the faster speeds in North Dallas just before Thanksgiving, and T-Mobile intends to deploy the upgrades to 90 percent of the top 25 U.S. markets on an unspecified timeframe. The upgrades are courtesy of combining existing AWS spectrum owned by T-Mobile with newer spectrum received after their acquisition of MetroPCS.

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criggs

join:2000-07-14
New York, NY
Reviews:
·Millenicom

Faster T-Mobile LTE Arrives in Dallas

According to »www.t-mobile.com/Company/Company···Services , the current 10x10 T-Mobile LTE network, which is what I have, performs, at minimum, 6 mps down/2 mps up. Here's what I'm currently getting in Manhattan, and this result has been pretty much the same no matter where I go in the borough:




Clearly, at least in Manhattan, the 10x10 has been performing very comfortably above minimum spec.

My question is whether T-Mobile, or anyone, has posted somewhere the minimum specs for LTE 20x20. I note from T-Mobile telephone customer support that the peak 20x20 speed is 84 mps, which is double the 10x10 LTE peak of 42. Does it necessarily follow that the minimums are doubled as well, i.e. 12 d/l/4 u/l?

For example, looking again at that T-Mobile spec page link I provided above, one notes the two flavors of HSPA + which are listed there exactly double each other on the download side only. Is it therefore a reasonable presumption that the 20x20 will also double the download side only but leave the upload speed pretty much the same as on the 10x10? That would translate to minimums of 12/2 on 20x20 LTE.

Anyone here know for sure? Thanks!

delusion ftl

@comcast.net

Re: Faster T-Mobile LTE Arrives in Dallas

Yes, the link speed is doubled and would result in an approximate doubling of speeds, but more realistically it doubles capacity, so you'll be more likely to see decent performance even in areas of high traffic.
criggs

join:2000-07-14
New York, NY

Re: Faster T-Mobile LTE Arrives in Dallas

said by delusion ftl :

Yes, the link speed is doubled and would result in an approximate doubling of speeds

Thank you.
iansltx

join:2007-02-19
Austin, TX
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The 42 Mbps you're thinking of is HSPA+. LTE has about 37.5 Mbps of capacity per 5 MHz FD channel (if you're talking about theoretical maximums like you do with H+), so 10x10 is 75 Mbps and 20x20 is 150. Now it's incredibly rare to see those kinds of speeds in practice because they require perfect RF conditions with no one else on the tower, but that's the theoretical capacity anyway...and that's why LTE is better than H+.

As for 20x20 being X times faster, it's hard to say. One disadvantage of wider channel sizes is that your phone is probably spreading the same output power over a wider bandwidth, decreasing outbound signal strength. This leads to a less-than-double performance gain in all-else-euqal non-ideal conditions.

However you also need to factor in that, above a certain speed, data usage doesn't really increase, and the speed you're getting is some function of the free capacity on the cell. So if you add 75 Mbps of capacity to a cell, with 45 Mbps of that readily available under normal circumstances, and people only use another 15 Mbps of capacity due to the faster speeds, you're looking at average speeds 30 Mbps faster than you were before!
criggs

join:2000-07-14
New York, NY
Reviews:
·Millenicom

Re: Faster T-Mobile LTE Arrives in Dallas

said by iansltx:

above a certain speed, data usage doesn't really increase, and the speed you're getting is some function of the free capacity on the cell. So if you add 75 Mbps of capacity to a cell, with 45 Mbps of that readily available under normal circumstances, and people only use another 15 Mbps of capacity due to the faster speeds, you're looking at average speeds 30 Mbps faster than you were before!

Interesting. So, if I understand you correctly, if average speeds had been 6/2, then theoretically you might see an increase in average speeds that is MORE than double, perhaps 36/32, or something like that. Have I misunderstood you?
iansltx

join:2007-02-19
Austin, TX
kudos:2

Re: Faster T-Mobile LTE Arrives in Dallas

Something like that, though upload capacity is significantly lower than download capacity.
sonicmerlin

join:2009-05-24
Cleveland, OH
kudos:1

Re: Faster T-Mobile LTE Arrives in Dallas

I've always wondered, why is this? And is there some future technology to fix this?
iansltx

join:2007-02-19
Austin, TX
kudos:2

Re: Faster T-Mobile LTE Arrives in Dallas

Base stations are bigger, don't have power constraints and have more antennas than phones. So you can modulate the download side of the connection more carefully than the upload side.