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Thread: AT&T 4G HSPA+/LTE Speedtests!

  1. #9211
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    2+30+12

  2. #9212
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    Quote Originally Posted by ecastro13 View Post
    2+30+12
    Enjoying that 256 QAM I see

  3. #9213
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    Quote Originally Posted by Checker79 View Post
    Enjoying that 256 QAM I see
    Haha yes! I've noticed it's not on every tower though. And it's only on B2 from what I've tested.

  4. #9214
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    Quote Originally Posted by Checker79 View Post
    Enjoying that 256 QAM I see
    Lol 256 QAM is not active with 3X CA.

  5. #9215
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    Quote Originally Posted by albert1735 View Post
    Lol 256 QAM is not active with 3X CA.
    It's 256 QAM without CA. Look at his upload speeds. At&t has confirmed 256 QAM is enabled in parts of the country.

  6. #9216
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    Quote Originally Posted by Checker79 View Post
    It's 256 QAM without CA. Look at his upload speeds. At&t has confirmed 256 QAM is enabled in parts of the country.
    Device can't do carrier aggregation and 256 qam until the Snapdragon 835..

    Sent from my 2PQ93 using Tapatalk

  7. #9217
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    Quote Originally Posted by Checker79 View Post
    It's 256 QAM without CA. Look at his upload speeds. At&t has confirmed 256 QAM is enabled in parts of the country.
    Yeah I get that. I find it odd that his test does indicate 64 QAM on the upload but service mode shows 3X CA. I thought the current Qualcomm modem can't do 3X CA and 256 QAM at the same time?

  8. #9218
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    Quote Originally Posted by albert1735 View Post
    Yeah I get that. I find it odd that his test does indicate 64 QAM on the upload but service mode shows 3X CA. I thought the current Qualcomm modem can't do 3X CA and 256 QAM at the same time?
    This whole thing about 256QAM+3xCA not being able to be done together is false. They are unrelated.

    The issue with the X12 and 3xCA is the amount of spatial streams it can handle.

    The X12 modem can process up to six spatial streams when leveraging 3-way carrier aggregation and 2×2 MIMO, but only four spatial streams (one component carrier) when attached to a 4×4 MIMO capable basestation.

    256QAM itself is not a spatial stream, but a form of modulation and how the data is handled. 2^8 bits per Hz as opposed to 2^6... 8 is ~33% more than 6, which is where we get the 33% faster peak speeds. Same goes for UL.

    Galaxy S7 - Carrier Aggregation Band 30 10 MHz PCC + Band 4 10 MHz SCC + Band 12 10 MHz TCC

  9. #9219
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    Quote Originally Posted by jakeuten View Post
    This whole thing about 256QAM+3xCA not being able to be done together is false. They are unrelated.

    The issue with the X12 and 3xCA is the amount of spatial streams it can handle.

    The X12 modem can process up to six spatial streams when leveraging 3-way carrier aggregation and 2×2 MIMO, but only four spatial streams (one component carrier) when attached to a 4×4 MIMO capable basestation.

    256QAM itself is not a spatial stream, but a form of modulation and how the data is handled. 2^8 bits per Hz as opposed to 2^6... 8 is ~33% more than 6, which is where we get the 33% faster peak speeds. Same goes for UL.
    Thanks for your clarification!

  10. #9220
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    Quote Originally Posted by jakeuten View Post
    This whole thing about 256QAM+3xCA not being able to be done together is false. They are unrelated.

    The issue with the X12 and 3xCA is the amount of spatial streams it can handle.

    The X12 modem can process up to six spatial streams when leveraging 3-way carrier aggregation and 2×2 MIMO, but only four spatial streams (one component carrier) when attached to a 4×4 MIMO capable basestation.

    256QAM itself is not a spatial stream, but a form of modulation and how the data is handled. 2^8 bits per Hz as opposed to 2^6... 8 is ~33% more than 6, which is where we get the 33% faster peak speeds. Same goes for UL.
    This should be in the HoFo wiki. There's much confusion about mimo, Qam, and CA.

    Sent from my SAMSUNG-SM-G890A using HoFo mobile app

  11. #9221
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    Quote Originally Posted by Joeybutts View Post
    This should be in the HoFo wiki. There's much confusion about mimo, Qam, and CA.

    Sent from my SAMSUNG-SM-G890A using HoFo mobile app
    What does QAM do for the network do?

    Sent from my STV100-2 using Tapatalk

  12. #9222
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    Quote Originally Posted by Joeybutts View Post
    This should be in the HoFo wiki. There's much confusion about mimo, Qam, and CA.

    Sent from my SAMSUNG-SM-G890A using HoFo mobile app
    Thanks!


    Quote Originally Posted by dandn1321 View Post
    What does QAM do for the network do?

    Sent from my STV100-2 using Tapatalk
    QAM itself is already present on every network dating back to GSM itself.... think of it as how many characters there are in the alphabet.

    Quadrature Amplitude Modulation (QAM) is best described like this... most if not all of you will get it.

    As I said in my earlier post, the difference is 2^6, or 64 (QAM) vs 2^8, or 256 (QAM)

    All data is sent in binary... either a 0 or a 1. With higher order modulation, you get to send two more pairs (8-6 is 2, 8 is 33% larger than 6) of binary. All data measurement is done on a bits/Hz ratio. With 64QAM, you're sending 6 bits per Hz, with 256QAM, you're sending 8 bits per Hz.

    Also, fun fact, 21.1 Mbps HSPA+ is the result of AT&T going from 16 to 64QAM on UMTS.

    Hope that clears it up for you!

  13. #9223
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    Quote Originally Posted by jakeuten View Post
    Thanks!




    QAM itself is already present on every network dating back to GSM itself.... think of it as how many characters there are in the alphabet.

    Quadrature Amplitude Modulation (QAM) is best described like this... most if not all of you will get it.

    As I said in my earlier post, the difference is 2^6, or 64 (QAM) vs 2^8, or 256 (QAM)

    All data is sent in binary... either a 0 or a 1. With higher order modulation, you get to send two more pairs (8-6 is 2, 8 is 33% larger than 6) of binary. All data measurement is done on a bits/Hz ratio. With 64QAM, you're sending 6 bits per Hz, with 256QAM, you're sending 8 bits per Hz.

    Also, fun fact, 21.1 Mbps HSPA+ is the result of AT&T going from 16 to 64QAM on UMTS.

    Hope that clears it up for you!
    I'm starting to understand it now thank you for helping me clear it up

    Sent from my STV100-2 using Tapatalk

  14. #9224
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    iPhone 7+ (Qualcomm) Georgetown, TX ........................... Spectrum 300/20, $84.99/month

  15. #9225
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    ran a few tests on this site that usually gives me great results

    Sent from my SAMSUNG-SM-G935A using HoFo mobile app

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