Confirming rumors from earlier this month, AT&T has confirmed the company is getting very close to launching their version of higher-audio-quality voice over LTE service (VoLTE). According to an AT&T announcement, AT&T's belated VoLTE implementation will launch on May 23 "in select areas" in Illinois, Indiana, Minnesota and Wisconsin, and "will continue to expand on a market-by-market basis." Handset support at launch is also expected to be very limited, with VoLTE only supported on the Galaxy S4 Mini at launch, "with more devices to come." AT&T had originally stated they'd hoped to launch VoLTE before the end of 2013, though like Verizon faced delays due to interoperability issues.
I didn't say anything about the coverage provided by the various technologies and spectrum combos, did I? I said that 700Mhz signals and 850MHz signals have similar propagation characteristics, which is a fact.
The reduced coverage provided by LTE on 700MHz vs UMTS on 850MHz has nothing at all to do with the spectrum being used and everything to do with the amount of TX power available out of the power amplifiers used in each technology. LTE has lower TX power. It is as simple as that.
No, actually it's not as simple as that. It's the code rate and how "fragile" to use simple terms the LTE signal is, NOT the transmit power. And you IMPLIED that LTE on 700 would offer better coverage than UMTS on 850, since THAT is the choice presented.
It's been really strange. Initially, Verizon's LTE was way out-covering their CDMA off the same towers, but now it seems LTE is more fragile than CDMA or AT&T's HSPA+, but there are a lot of factors, including TX power, channel width, and how OFDMA allows decent data transmission with low signal strengths.
Well, there's a lot to it. OFDMA is more sucesseptible to issues, even though it can in theory, also work with a weaker signal. Also, they are putting out big fat 5x5 and 10x10, and even 20x20 channels out now, whereas EVDO was 1.25, and even HSPA was 5x5.
How will they implement price discrimination (»en.wikipedia.org/wiki/Price_disc···lanation) when everything is data? Will they continue to bill voice calls as "minutes," even on unlimited minute plans, or will they charge per byte?