Wi-Fi dropping off

Discussion in 'iOS Forum' started by DRad2003, Mar 9, 2012.

  1. DRad2003
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    DRad2003 New Member

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    Noticed that after the update to 5.1 my Wi-Fi drops out and I go back to 3G if I let my phone sleep for an extended period of time. Anyone else having that problem?
  2. keith1210mk2
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    keith1210mk2 New Member

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    The iPhone will always break the connection to Wi-Fi unless plugged in to a power source.
    This is to conserve battery life.
    Has it only happened since updating?
  3. DRad2003
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    DRad2003 New Member

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    Yeah, I knew about that but once I unlocked it it would pick up signal again. Now I have to go and turn it off and back on again. And yes just since the new update. I also did the update via iTunes and not OTA since I wanted to back up some purchased apps.
  4. keith1210mk2
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    keith1210mk2 New Member

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    Is it still under warranty? Maybe a trip to Apple.
  5. zig9449
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    zig9449 New Member

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    I always keep 3G off when I'm at home and connected to wifi.

    The wifi icon won't show until I wake the phone, but will always receive notifications w/ data off and in sleep mode.

    Maybe that's just how iOS 5.1 is suppose to be?
  6. keith1210mk2
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    keith1210mk2 New Member

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    Same here. Battery saver.
    You still get all your notifications on home Wi-Fi so no big deal.
  7. bakerj417
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    bakerj417 New Member

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    Having same issue wifi connection drops after a while when phone is asleep, and it is worse for me because in this area where my office is I get horrid service. My battery life goes wayyyyyy down because I am roaming trying to look for data service. Is there anyway to make it stay on wifi because for me at least it is not a battery saver it is a killer. I have tested cutting off data while at work and just staying on wifi and that makes it stay of wifi and battery life is amazing, so that proves to me atleast that this is an issue.

    any thoughts?
  8. zig9449
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    zig9449 New Member

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    The only way to make a phone stay on wifi is for it to be connected to a decently strong wifi network.

    I don't really think its an issue. That's just how it is.
  9. bakerj417
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    bakerj417 New Member

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    Thanks for the reply.

    Well I wish there was a option to change that feature, because at least in my case it is not helping to disconnect and go back to data. I was thinking it may be an issue because I believe it also happens on my home network when I am sitting almost beside the router. I will report back if I see it happening on my home network too.

    thanks all!
  10. zig9449
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    zig9449 New Member

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    So you are saying that even at home beside your router the wifi will disconnect until you open Settings> Wifi and connect to it again?

    Or is it disconnecting from Wifi while asleep and does not connect again until you wake the phone?
  11. Skull One
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    Skull One Super Moderator Staff Member

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    This is technically a two fold issue.

    This is directly from iOS developer library - UIKit Keys

    So the developer is actually the one in control of part of the issue.

    The second part of this issue is iOS natively works in NO mode. So if there are no apps running you get what you are seeing now.
  12. bakerj417
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    bakerj417 New Member

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    When it falls asleep it disconnects, and when I wake up the phone it reconnects. When I get home I will confrim it's doing the same thing that it doesn't work.
  13. Skull One
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    Skull One Super Moderator Staff Member

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    The moment that the screen turns off, a 30 minute timer starts. At the end of that time, if NO applications are registered to use the WiFi chip, it turns off. This is NOT a design flaw. It is exactly how iOS was designed.

    It was done that way for a VERY simple reason. Push notifications are already tied to cell data. So why leave the WiFi chip on? The only way to tie the Push notifications to WiFi is to turn cell data off.

    And the only time you really need to turn of the cell data is because you are in a weak or dead zone. Because when you are in a weak or dead zone it forces the cellular connection to switch to the highest transmission power possible to help search for a tower.
  14. zig9449
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    zig9449 New Member

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    Yup...Skull One said it all.

    A much better understanding then i had of it.
    Last edited: May 16, 2012
  15. Skull One
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    Skull One Super Moderator Staff Member

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    That is incorrect. WiFi will not turn back on until you bring it out of sleep mode. Mainly because it has no need to. Push notifications are done thru a persistent IP connection that is opened thru the cellular data connection. The only time Push notifications are done thru WiFi is if you turn off cellular data.

    The reason for that is pretty simply. There is no such thing as Push in TCP/IP. Doesn't exist. You have to open a port between the two IP addresses and keep it open. At that point they are both listening for data. That port can stay open 24/7 till the end of time if the data connection is not broken.

    Since they turn off WiFi they do everything thru cellular since it is already on and has to be attached to the tower to begin with. Actually a pretty brilliant design.
  16. zig9449
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    zig9449 New Member

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    Yeah your rite Skull One.

    I had received that information from a website I found when I was looking for a fix for the solution myself. it was a whole ago, so I don't even remember what site it was.

    Thank you for the correction.;)
  17. bakerj417
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    bakerj417 New Member

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    Oh, ok great!

    Well that makes a lot more sense thank you for explaining that to me. I had been trying to research that answer for the past 3 months that i have had the phone.

    I think the best solution for me is when I am at work(in a weak zone for data) is to just turn off cell data. That will save my battery from it going into highest transmission power.

    Thanks for all the replies and sorry if I offended anyone, didn't mean to imply there was a design flaw, I was just ignorant on the subject. Love me some apple!
    Last edited: May 16, 2012
  18. Skull One
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    Skull One Super Moderator Staff Member

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    Ok, hopefully I won't bore you with the long explanation for your situation :)


    Lets start with the cellular side only without worrying about data at all. Modern cell phones communicate with the tower periodically for a few reasons.

    1) Is a tower there?
    2) How much power is needed to communicate with that tower.
    3) To see if a tower switch is needed.
    4) Report which tower quadrant you are near for incoming calls, SMS and MMS.

    You can be 100 feet or 5 miles from the tower and it always does that check list. Now there are a few variables that affect how good of a signal you have. Distance, line of sight obstructions, bouncing/reflective signals, EMI (Electromagnetic Interference) and the number of people already connected to the tower.

    So lets use a layman's example to explain how this all works.

    I am standing 10 feet from you. You (the cell phone) can say something and I (the tower) should be able to acknowledge you with no issues. Now because you are 10 feet from me, you can use a very soft voice (lower power at about 1/8 to 1/4 of a watt) and I will be able to hear. Now on the other hand because I am the tower you will get a VERY LOUD response back. Why? Because I say (transmit) my answer at my max power because I don't know what distance you are from me.

    Life is good. You can last all day (battery usage) at this distance. But as you get further away, you have to talk louder and louder (higher power at around 1/4 to 3/4 watt) as the distance expands. Eventually you will hit the limit of your voice (1 watt of power) and I will no longer hear you even though you can hear me (I have LOTS of power since I am tied to the power grid). As you can see you can end up using up your battery 4 times faster.

    Now that is for only you talking with me. Imagine if there are 100 people that are 100 to 5000 feet from me all talking to me at once. Now you have to talk louder (use more power) to get my attention. Now imagine 1000 people near me. You can see where this is going. As the number of cell phones increases more and more power is required to get the cell towers attention. Now to help that, the cell phone only "talks" or "pings" the tower when needed to make sure everything is ok. That helps reduce the power needed to maintain the check list.

    But the second you switch to data or voice mode, then the connection has to be maintained 100% and that is where you can get very serious battery drain. So when you switch off cellular data and use only WiFi, you remove that battery drain scenario since WiFi requires much less power than the cellular connections.


    Hope that clears everything up.
    Last edited: May 16, 2012
  19. bakerj417
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    bakerj417 New Member

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    Thank you for the explanation sir.

    I had added this after reading your post more closely and wanted to make sure you saw it. Thank a bunch again.

    "I think the best solution for me is when I am at work(in a weak zone for data) is to just turn off cell data. That will save my battery from it going into highest transmission power.

    Thanks for all the replies and sorry if I offended anyone, didn't mean to imply there was a design flaw, I was just ignorant on the subject. Love me some apple!"
  20. Skull One
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    Skull One Super Moderator Staff Member

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    You are very welcome and I doubt anyone was even remotely offended.

    But I actually believe there is a design flaw that could be corrected and it wouldn't take much to fix it. Of course no one is going to do it. Mainly because it makes too dang much sense. Especially since it doesn't cut into the cell phone providers profits.

    Personally, I would change the cell phone system to use both cellular and WiFi for calls, SMS and MMS. It would use the antenna with the lowest power requirement to transmit the data. This would extend the life of batteries tremendously. And since the current smart phones already transmit their voice data in a digital pattern, switching it to WiFi and routing it to the end caller is pretty simple. Like less than 3 months worth of work simple if they did it right. Vonage already worked out all the issues :)
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