AirDrop is very slow!

Discussion in 'iOS 7' started by tmanto02, Sep 29, 2013.

  1. tmanto02 macrumors 65816

    tmanto02

    Joined:
    Jun 5, 2011
    Location:
    Australia
    #1
    I tried out airdrop for the first time tonight and can I say that I was very disappointed. I transferred a 2 min video from my iPhone 5 to my girlfriends and it took almost 2 mins to transfer!

    I assumed it would be almost as fast as airdrop for mac.

    I think I will stick to instashare from now on.
     
  2. matttye macrumors 601

    Joined:
    Mar 25, 2009
    Location:
    Lincoln, England
  3. tmanto02 thread starter macrumors 65816

    tmanto02

    Joined:
    Jun 5, 2011
    Location:
    Australia
    #3
    There is no way of finding out on iPhone, however like I said airdrop on a my MacBook airdrop transfers are as fast as my wireless card allows which is 300 Mbps so I assumed iPhone would do about the same.
     
  4. odin macrumors member

    Joined:
    Jul 22, 2002
    #4
    It's supposed to start the transfer on Bluetooth and then move to WiFi as that is established between the two devices. I've noticed it seems a bit slow as well, as if the move over to WiFi on larger transfers is not happening. I haven't really done much research so far because I figured it would be fixed soon. I'll do some digging to see what I can find.
     
  5. tmanto02 thread starter macrumors 65816

    tmanto02

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    #5
    Yeah I noticed that neither phones displayed the wifi symbol, so I was a bit thrown off by that, perhaps it transferred using Bluetooth instead of wifi like it is meant too.
     
  6. Mlrollin91 macrumors G4

    Mlrollin91

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    Location:
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    #6
    A 2 minute HD video can be upwards to 300MB. Even at a 50Mbps internet connection it will take about 45 seconds.

    I've only used it for pictures and for me at least its been pretty much instantaneous.

    Isn't peer-to-peer slower than an internet connection though? So that would explain why it is slower than Mac Airdrop because that is done over a WiFi internet connection. I could be wrong, but thats what I've always thought.
     
  7. matttye macrumors 601

    Joined:
    Mar 25, 2009
    Location:
    Lincoln, England
    #7
    AirDrop is very slow!

    No, peer to peer is much, much faster. They can theoretically make use of whatever the fastest speed is for the latest wifi technology supported.

    Wifi direct doesn't use the internet; it just communicates directly from device to device using wifi.

    So around 300mbps for 802.11n I believe.
     
  8. hafr macrumors 68030

    Joined:
    Sep 21, 2011
    #8
    The iPhone 5 maxes out at 150 Mbps on the 5 GHz band for battery saving purposes, so no 300 Mbps here, no sir.

    (The MBP goes to 450 Mbps though.)
     
  9. tmanto02 thread starter macrumors 65816

    tmanto02

    Joined:
    Jun 5, 2011
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    #9
    Ok so lets say that my video is 200MB. If the iphone's wireless chip is 150Mbps then airdrop should take around about 10 seconds not a couple of minutes.
     
  10. JetBlack7 macrumors 68020

    JetBlack7

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    May 14, 2011
    Location:
    Portugal
    #10
    Never tried with videos, but with everything else took like 3 seconds on my iPhone 5.
     
  11. hafr macrumors 68030

    Joined:
    Sep 21, 2011
    #11
    150 Mbps is a theoretical max for the 5 GHz bands, you won't reach those speeds in real life transfers.

    Using 2.4 GHz instead of 5 GHz, only one stream, encrypting... These things all mean slower transfer speeds, by quite a lot actually. But I'm in no way, shape or form an expert when it comes to wireless transmissions, nor do I know how AirDrop actually works (more than using an ad hoc wifi peer to peer connection) But I wouldn't be surprised to see speeds at something like 10 Mbps, which would be about three minutes for a 200 MB movie clip...
     
  12. Goldfinger macrumors 6502

    Joined:
    Jan 7, 2006
    Location:
    Belgium
    #12
    Those rated Wifi speeds are always very very theoretical. For example 54mbit wifi mostly maxes out at around 20-25mbps. But I guess 75-100mbps should be doable if the devices are close to each other and connect peer to peer.
     
  13. Curun macrumors 6502

    Curun

    Joined:
    Sep 10, 2013
    #13
    150 Mbps rated at the lowest physical link layer, and after protocol overhead up at the application link layer is around 90mbps at best.

    90mbps = 10.72 MB/s

    200MB / 10.72MB = 19 seconds.

    I started out to clarify your numbers. But that's about right. I would certainly expect much quicker than 2 minutes.

    There's a chance it's only negogiating over 2.4ghz. Which would roughly half those numbers 65or72mbps vs. 150. But should still transfer in under a minute.

    In conclusion, I don't know.

    It uses BT to negotiate, but WIFI to transfer. 2 min is still faster than bluetooth which is around a miserable 3mbps IIRC.

    ----------

    A little wiki

    http://en.wikipedia.org/wiki/Bluetooth#Bluetooth_v3.0_.2B_HS

    This moved forward into BT4.0 spec as well.

    24Mbps, dropped to 14.4 mbps by an overhead guess (I do a .6 factor for wireless tech, .8 for wired). Which is 1.72MB/s.

    200MB / 1.72 = 117 seconds.

    There's your potential 2 minutes for a 200MB movie.

    ----------

    more

    http://www.telecompaper.com/news/qualcomm-atheros-unveils-bluetooth-40-hs-chip-system--824090

    Granted. iPhone uses Broadcom IIRC, it's going to be a similar spec since standards based.
     
  14. tmanto02 thread starter macrumors 65816

    tmanto02

    Joined:
    Jun 5, 2011
    Location:
    Australia
    #14
    Yeah I suppose there is a lot more to it than just "sending" the file.

    Anyway I still think I will stick with Instashare, it lets you wirelessly transfer files to your mac too. :)
     
  15. PM-Performance macrumors 6502

    Joined:
    Feb 12, 2012
    #15
    Mine seems to transfer fast, but take a while for the airdrop user to Pop up as avail.
     
  16. odin macrumors member

    Joined:
    Jul 22, 2002
    #16
    If I get a chance this week I'll try to do some relatively controlled transfers. Regardless of normal overhead and other issues, in my experience it seems a bit more sluggish than it should with larger transfers.
     

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