iPhone 3GS Upstream Transfers Limited to 384 Kbps

Discussion in 'iOS Blog Discussion' started by MacRumors, Jul 9, 2009.

  1. MacRumors macrumors bot


    Apr 12, 2001

    Macworld reports that while the iPhone 3GS does support the improved 7.2 Mbps download transfer speed now currently being deployed in the U.S. by AT&T and already available in other parts of the world, it will not support the correspondingly improved upload transfer speeds of 1.4 or 1.9 Mbps generally available on such networks and will be limited to the same 384 Kbps upload speed available on the iPhone 3G.
    Macworld's report is a follow-up to a previous article that discussed the ins and outs of the High Speed Packet Access (HSPA) network standard and how AT&T's offerings compare to that standard.
    So while the iPhone 3G was unable to even take full advantage of existing upstream transfer speeds, the iPhone 3GS suffers from the same limitation. But the limitation is not unique to the iPhone, as the new report mentions that other GSM smartphones are also utilizing the older UMTS standard at a maximum of 384 Kbps.
    Smartphones using competing CDMA technology, such as those on Sprint and Verizon, however, do take advantage of the full upstream capacity, suggesting that the limitation is related to the use of GSM technology as the basis for these cellular networks.

    Article Link: iPhone 3GS Upstream Transfers Limited to 384 Kbps
  2. thegoldenmackid macrumors 604


    Dec 29, 2006
    dallas, texas
    I can't imagine it would make a significant difference to most if it was limited even at 600kpbs, after all most users are satisfied with 160kpbs.
  3. kdarling macrumors demi-god


    Jun 9, 2007
    First university coding class = 46 years ago
    The problem, as others have pointed out, is that poor upstream bandwidth limits the ACKs going back... thus potentially limiting the downstream speed, especially for TCP/IP.

    There are about a gazillion papers (and a few Internet RFCs) about the ack problem with unequal bandwidths.
  4. aardwolf macrumors 6502

    May 30, 2007
    Standard broadband from Comcast here in the Memphis metropolitan area tops out at 384kbps upload. Most people have no idea their "10Mbps" isn't both ways. I seriously doubt most people would notice a speed bump on their upload either... unless they're constantly uploading things.

    I have my own web server, so I went with local DSL and am enjoying 3Mbps upload.
  5. Diode macrumors 68020


    Apr 15, 2004
    Washington DC
    Well here in DC and most of the NE you can get Verizon Fios with 25/25 for a reasonable rate (like 64/month) or even 50/25.

    100 synchronous is already offered in some parts of the country.

    I would say "most people" would be a poor statement. Not to mention this becomes a further problem when AT&T begins allowing tethering.
  6. ibwb macrumors regular

    Mar 7, 2006
    Ack bandwidth is important but you don't need equal upstream to your downstream to send out acks. Maybe more like 10%.
  7. aardwolf macrumors 6502

    May 30, 2007
    Let me qualify that by saying "most people in this area".
  8. str1f3 macrumors 68000

    Aug 24, 2008
    All this means to me is another reason for the iPhone to be on Verizon. I can't believe this is not a Page 1 story.
  9. kironin macrumors 6502a


    May 4, 2004
    glad I will be not getting a new iPhone till the next upgrade
  10. Full of Win macrumors 68030

    Full of Win

    Nov 22, 2007
    Ask Apple
    I was about to post the same point about this being page 1 material.
  11. optophobia macrumors 6502a


    Oct 26, 2007
    Hudson MA
    Yeah because then when something goes wrong with it, Verizon has outstanding Customer service....oh wait...
  12. MovieCutter macrumors 68040


    May 3, 2005
    Washington, DC
    Where the heck in DC can you get Fios? It sure as hell isn't DC Metro.
  13. Shasterball macrumors 6502a


    Oct 19, 2007
    And then we will all complain about [fill in future complaint here].

    The truth is, I have the 3GS and it is crazy fast. Most users won't notice the difference. Plus, with new, graphics intensive games/apps coming out, it's nice to have the extra horse power (CPU-wise).
  14. aperry macrumors 6502a

    Jul 12, 2008
    For non-jailbroken phones this will only really affect tethering. And even within the realm of tethering it would only affect you if you need to host a website, use bit torrent, or upload and/or email large files somewhere.

    That said, I'd be disappointed to be paying an arm and a leg for tethering only to have handicaps like this applied.
  15. Howardchief macrumors regular

    Jun 9, 2008
    ZING! Well done. :D

    I absolutely loathe Verizon customer service/support. Bunch of blue babies..
  16. djellison macrumors 68020

    Feb 2, 2007
    Pasadena CA
    I've only found one place in the entire UK where 3G even threatens to get that fast, and that's central London. A total irrelevance.
  17. juice macrumors newbie

    Sep 27, 2007
    Uh... you can get it pretty much everywhere. I have it in Arlington, know people with it in Reston, Great Falls, McLean, Chantilly, Fairfax.... pretty much everywhere now.
  18. aendaman macrumors member


    May 28, 2008
    lame to the max

    yeah thats really lame! i could not believe it when they were talking about uploading video content to youtube or whatever and later when i checked i could not find any HSUPA capable chip in the iphone specs.
    i just did a quick estimation that a one minute video would take ten minutes to upload at that UMTS speed of ~50KByte/s... wtf?
    not to mention internet tethering... thats when you would probably like to quickly email a X MB powerpoint/pdf file from on the road.
    and dont tell me HSUPA will drain battery significantly more than HSDPA.

    that said, i will get a 3gs this october :rolleyes:
    just sad because where i live, t-mobile has great coverage for both HSDPA and HSUPA...
  19. ChoMomma macrumors 6502


    Yeah so that is not D.C. or Metro D.C... you are speaking of Northern Virginia.
  20. Xian Zhu Xuande macrumors 6502a

    Xian Zhu Xuande

    Jul 30, 2008
    I dislike AT&T... but I *hate* Verizon. They are by far the most cooked and self-serving company in an industry of self-serving crooks.
  21. Diode macrumors 68020


    Apr 15, 2004
    Washington DC
    FIOS is available in DC at a few Apartments in the Capitol Riverfront area. More areas will be available by the end of the year.

    Most of DC metro (outside of the District itself) already has it.

    Comcast already offers 50mbps in DC anyways so the bickering of in dc/out of dc is moot.
  22. aristotle macrumors 68000


    Mar 13, 2007
    You might want to look at the wikipedia pages showing where HSUPA is deployed versus where HSDPA is deployed. Most of the target markets for the 3G only have UMTS/HSDPA and even the current CDMA providers in Canada only plan on implementing UMTS/HSDPA as a stepping stone for LTE. LTE is just around the corner so I would expect that the next iPhone will support LTE rather than bothering with HSUPA.
  23. SpinThis! macrumors 6502

    Jan 30, 2007
    Inside the Machine (Green Bay, WI)
    Yeh—I would estimate even less than that. I have no problems getting the full 15 mbps out of my twc connection and my upload is only 1 mbps.

    Some of those RFCs were written decades ago too when modems were state of the art. Along with fatter pipes also comes less problems with latency which I would wager is a bigger factor in internet speed. Fatter pipes + less latency + faster processors = less dropped packets = less ack packets.
  24. iPhoneNYC macrumors 6502a


    Nov 25, 2007
    Remember, ATT is supposed to deliver tethering by the end of the summer. Then this would really come into play.
  25. FoxyKaye macrumors 68000


    Jan 23, 2004
    San Francisco, Terre d'Ange, Bas Lag, Gallifrey
    You said it.

    Then again, whenever my AT&T service drops a call, interjects static, interjects cross-talk from someone else's phone, won't find the network in my apartment, or simply gives me a network busy error when trying to dial out, I remember my days with Verizon fondly.

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