T-Mobile 3G Handsets to Be Rendered Obsolete by AT&T Merger

by Kevin Krause From: http://phandroid.com/

In case you have been resting under a rock somewhere, AT&T is in the process of buying out T-Mobile and merging the two companies into a singular (no, not Cingular) wireless conglomerate. As part of the deal, AT&T plans to re-purpose all of TMo’s 3G towers for the roll out of their LTE network,which should cover 95 percent of the country within two year’s time. The catch? Your 3G T-Mobile handset will be obsolete when that time comes, as confirmed by AT&T.

Seeing as how far off the problem is there is no news to share as to whether AT&T plans to compensate TMo subscribers locking into new two-year deals, but if you are a fan of magenta it may be wise to consider shorter-term contract options if you plan on picking up a new handset anytime soon.

[via Gizmodo]

AT&T Changes Tune, Allows VoIP Over Cell Network

Dan Moren, Macworld.com

All engines, full reverse! That's the order AT&T seemed to be giving on Tuesday when it announced that it would be altering its existing policy to allow Internet phone applications such as Skype to place calls over the iPhone's cellular data connection.

Previously Skype and other Voice over IP (VoIP) applications for the iPhone, such as Fring, were relegated to Wi-Fi connections, prompting calls of foul play by consumers who often wanted to take advantage of features like the services' cheaper rates for international calling. An FCC investigation was launched in April at the behest of Internet advocacy group Free Press, shortly after the Skype app was released for the iPhone.

Notably, the ban did not apply to non-iPhone devices on AT&T's network. "Today's decision was made after evaluating our customers' expectations and use of the (iPhone) compared to dozens of others we offer," AT&T Wireless CEO Ralph de la Vega told The Wall Street Journal.

While some alleged that AT&T's desire in keeping Skype off its data network was a way of stifling competition and forcing customers to use the wireless company's international calling options, it's also been suggested that AT&T was worried about the amount of traffic the immensely popular iPhone could bring to bear on its network.

Somewhat coincidentally--if you believe in such things--earlier in the day, Google and Verizon held a joint press conference to announce their new partnership, in which the two companies stressed network openness.

The decision today does not apparently affect other applications that suffer from similar restrictions, such as the iPhone version of SlingPlayer Mobile, which allows users to stream video from their home devices only over Wi-Fi connections. Nor does it affect the contentious Google Voice service, which uses the standard telephone functions of the cellular network to route phone calls to and from users.

Giz Explains: How Cell Towers Work

By Wilson Rothman

I recently visited a cell site shared by Clearwire and two other unnamed carriers—without frying my nuts. We've all driven past them so many times, but have you ever actually wondered how they work?

How They Work
Whether it's handling simple phone calls or 12Mbps WiMax data, cell sites are organized with more or less the same flow:

• A cellphone or modem radios the nearest towers, saying, basically, "I'm here!" When you make a call or logon, your phone then sends a message via radio that's picked up by the antenna array.

• A wire or fiberoptic line carries the call down to the wireless access point, connected to a multi-port switch.

• The call, along with many others, gets routed to a backhaul, usually down to an underground wired T1 or T3 line, but sometimes back up the mast to a powerful line-of-sight wireless microwave antenna. They resort to wireless either when they don't have a ground connection, or when the ground connection sucks.

• The incoming call or data comes back from the backhaul and up through the switch to the antenna, where it then hits your phone wirelessly, presuming your phone is still communicating with the same site. If you are moving, then there's a handoff—a new but more or less identical cell site transmits the data to your phone, once your phone checks in and says "I'm here."

All of this happens in the blink of an eye.

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The Gear
Clearwire, who gave me the tour of the cell site during my WiMax test run, is a new company, only just now deploying their network, one that is only focused on data, and not on voice calls. This means they don't have a bunch of sites already established like other carriers (though their recent acquisition by Sprint may change this). But it also means their cellular gear is modern and compact compared to the others.

For instance, the carrier whose name probably starts with A keeps its gear in a bunker like the Endor moon one that Han Solo & Co. were trying to bust into in Jedi. The backup batteries must be enormous, because there's a sign on the door that says, "Danger - Corrosive Liquids - Wear Protective Equipment."

Clearwire, by comparison, has a high-school locker for its gear—one that is built somewhere else and just trucked to the location. You attach it to the on-site power, run lines and antennas up the mast, and either bolt the sucker to a cement foundation or to the side of a steel post, and voila, you are done. It uses two car batteries for its backup power—enough juice to last six hours and they don't have to wear a hazmat suit to service it. (It can also run off of a portable generator.)

In this particular site, the carrier whose name may start with a V had a set of three larger lockers, not the huge bunker that its competitor had, but a serious array nonetheless. As you probably guessed, each carrier locks up its own facility, so I wasn't at liberty to fully inspect the other guys' gear—or even confirm their identities.

Clearwire also runs skinny fiberoptics up to the top of the tower, instead of the thick insulated copper cables that the old boys' networks run. Again, this has more to do with newness than simple common sense, but it may mean cell towers could be a little slimmer in the future.

So what happens up top?
The real demystification was the antenna array itself. I for one did not know a lot about how things were set up, and now I know a tiny bit more, which I will share:

• The huge antenna masts can have multiple carriers, each with its own triangular platform and antenna array.

• The reason the platforms are triangular is so the 360-degree coverage can be split into 120-degree pie pieces, which—if you look closely—can be subdivided again into 40-degree slices for increased, pinpointed coverage.

• If there's a white disk-shaped antenna among the array, it means that the carrier has a line-of-sight microwave backhaul. Clearwire's can handle 80Mbps at the moment, but must be directly in line with another microwave antenna. (Speaking of fried nuts, I wouldn't want to stand between two of those.)

Don't forget to read our exclusive uncapped WiMax road test—featuring blistering wireless speeds!