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Love this idea. Happy to contribute.

 

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Fwiw...looks like mostly working now. Haven't had any VoLTE problems today.

 

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As a user...TMOs band 12 coverage is not yet on par with HSPA. LTE handoffs to hspa are seamless though, and data during voice isn't a problem. Sprint 1x coverage is still more reliable indoors than TMO.

 

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Most stations in NYC have Sprint service available, I think because it(Penn Station) might be handled differently than the normal MTA stations we really have no idea when if ever that might get addressed

 

I also dont think VoLTE would help that situation, in fact I think it might hinder coverage. CDMA voice has extensive coverage, probably as good as any carrier, VoLTE or not.

The VoLTE may not help coverage... But the whole data while on a call thing...

 

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CA+Second carrier are truly all they are cracked up to be! Picked up Second carrier and CA uptown Manhattan and also some in Northern NJ.

 

Also checked out Dead Pool at AMC on 34th street, Looks like CA is live there as well. Hit almost 90mbs indoors!

 

I really don't know how any other carrier will compete here in NYC.

I hope this is true! For now, I'm stuck with crappy service in Penn station, and random drops to 3g for no good reason that don't come back without a toggle. And please...we need VoLTE...

 

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Besides speed, B41 still isn't built out well in the suburbs. In my area of suburban NJ, I can pick up B41 in some town centers, outdoors. Once I go on to residential streets, I drop to band 25 or 26. That's OK... Until they get congested and I find my phone hanging out on 3G...

 

I am very happy with the fact that Sprint will almost always allow me to make a phone call wherever I am in the NYC area. I'm just waiting for densification...

 

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Keep in mind that "3G" can be either CDMA1X or EV-DO. Did SignalCheck Pro show both CDMA1X and EV-DO connections on VZW?

 

AJ

Urgh. Not sure. I will have to repeat the experiment.

 

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As another data point...I updated my PRL yesterday morning.  I then dropped off my daughter's school bag at our local school in central NJ.  Normally, the school is a dead zone for both Sprint and T-Mo (I have Project Fi).  In the school office, I looked down and realized I was on 3G...a quick check of SCP revealed I was on Verizon.  By the time I got back to my car outside, I was back on native Sprint coverage.

Slightly ot here but when you roam on viaero do you get data, or voice and text only?

 

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From the Nokia white paper, you need to read the above sentence carefully. The low band PCC and high band SCC function exactly like I said that they do.

 

AJ

Got it now. Thank you.

 

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Yes. I am roaming on my Fi on all Sprint CDMA roamers. Including Verizon. And my usage counts all the same.

 

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I'm new to Fi so I did not know this. That's bloody awesome. Pretty sure that's not true for the TMO side of the house.

 

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Nexus 6 here on 55051. Using Google project Fi.

 

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Interestingly... 55051 on my Google Fi Nexus 6. Does that mean we roam the same places as Sprint postpaid?

 

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You may be misinterpreting me, I may be misinterpreting you, or Nokia may be talking just pie in the sky ideas. But, no, LTE CA standards do not support the PCC uplink in one band, the PCC downlink in a different band. The PCC uplink and downlink are in the same band. The SCC downlink, though, may be in a different band. That is inter band CA.

 

For example, if AT&T is using band 4 + band 12 CA, the PCC uplink and downlink are both band 4 -- or they are both band 12. The downlink of the other band is the SCC. There is no "Hey, let's aggregate just the lower frequency band 12 uplink with the higher frequency band 4 downlink." Besides, that would be foolish, as it would orphan the downlink in band 12, the uplink in band 4, wasting spectrum.

 

And before anyone asks the question, no, it is not feasible to convert any of these FDD bands to all uplink or all downlink. By design and regulation, they are paired spectrum bands, and that is that. Sprint cannot decide to use all of its band 25 spectrum as uplink for CA with its band 41 downlink -- because half of its band 25 spectrum will remain downlink forever unless/until the PCS 1900 MHz band is scrapped.

 

So, for Sprint, the most realistic lower frequency uplink and higher frequency downlink CA combination is PCC uplink and downlink in band 25 with SCC downlink in band 41. And instead of TDD, some band 41 could be converted exclusively to supplemental downlink.

 

AJ

OK. I'm clearly getting this wrong, but I'm not sure where. You need more reading like a hole in the head I'm sure, but here is the passage I was looking at:

 

"Coverage benefits

LTE coverage in the macro cells is uplink limited because of the

lower terminal output power (200 mW) compared to the typical base

station power of several tens of watts. The minimum threshold for

LTE is typically Reference Signal Received Power (RSRP) of -120 dBm

before handing over the connection to the 3G network. The minimum

threshold is limited by the uplink coverage, while the coverage could

be even wider if we consider only the downlink direction. Carrier

aggregation can enhance the coverage by using the low band for

the uplink connection while the downlink can still be received by the

device, both on the low band and on the high band. The high band

connection could not be used without carrier aggregation.

The outcome is that carrier aggregation can enhance the downlink

coverage of the high band. Field measurements indicate that the high

band Scell can contribute to the throughput at lower signal levels

down to -130 dBm. Those devices that are closer to the base station

can also use LTE1800 as the primary cell and uplink transmission."

 

Full paper can be found at http://networks.nokia.com/sites/default/files/document/nokia_carrier_aggregation_white_paper.pdf

 

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The short answer to that is no. It is an oversimplification that has gotten traction through repetition.

 

 

Somebody or something screwed up -- either in the PCMag testing or in the PCMag testing citation. The iPhone 5S is dual band, not tri band. It cannot hit peak speeds of 42 Mbps on 5 MHz FDD in band 25/26.

 

Regardless, most people will not notice the difference in peak or average speeds between single carrier and 2x CA on band 41. The difference between 121 Mbps and 78 Mbps makes no difference to their usage. In both cases, Sprint "just works."

 

The point is to get tri band handsets into the hands of Sprint users. Any 2x CA is icing on the cake. And that is my point.

 

AJ

I am a bit surprised to hear this. I was reading a Nokia white paper on CA yesterday, and it specifically said that one benefit of CA is the ability to use lower frequency bands on the uplink, where transmit power is an issue, while using higher frequency bands at greater distances for downlink. I understand that b41 wouldn't be exclusively downlink, for example, but sure Sprint would look to use CA to improve coverage reliability?

 

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