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wifi based communication systems for corporate offices using wifi diect

Discussion in 'Radio and Wireless' started by Nirmal ka, Jul 8, 2014.

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  1. Nirmal ka

    Nirmal ka

    Jul 8, 2014
    friends, i hav an idea of implementing the whole mobile communications using wifi networks ( without SIM )
    i am planing about implementing cell broadcasting, sms, and wifi powered notice boards.......can anyone help me out do this??
  2. Gryd3


    Jun 25, 2014
    Do you have any relevant experiences in telephone communications or networking?

    From the sounds of it, you would like to use WiFi instead of one of the incumbents GSM, GPRS, EDGE, 3G, HSDPA, or HSPA to deliver phone calls and SMS. What would you like to do with notice boards?

    A good place to start would probably be SIP, but I'll wait before talking too much to make sure I know what your after.
  3. shumifan50


    Jan 16, 2014
    If you connect your handset to a wifi router(no mobile data connection), you have:
    1. skype to talk and video conference
    2. skype to send messages (SMS like) or whatsap
    3. Any PC and most handsets have skype.
    You can also look at viber and many other apps that are around and free.

    No need for cells.

    Note: Be careful about using the term 'wifi direct' as that is a Samsung thing. Rather say using wifi instead of....
  4. Gryd3


    Jun 25, 2014
    Eww... you don't wanna use Skype for this. Use a protocol you can manipulate. ;)
    SIP is a standard format used handling calls and there are clients available to all sorts of OSes and handhelds. XMPP is another standard that takes care or things like instant messaging. Both of these protocols are very well documented, which will allow you to build custom code on almost anything to interact with it. You will more creative freedom with something like this, but using pre-made apps like Skype will make it much easier to setup if your fine with the features offered.
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Let my raise a few more issues:
    1. How do you handle handoff from one router to another.
    2. Would you use a mesh network between the nodes or rely on the internet for routing between nodes?
    3. How do you protect against spoofing
    4. Can it work if the user is connected to another wifi network?
  6. Gryd3


    Jun 25, 2014
    Potential solutions already:
    1 - Handoff from one router to another can be accomplished with existing technology like WDS... it is not ideal and your throughput can suffer. Other solutions can be costly if it needs to be seemless.
    2 - (Op preferences)
    3 - Safeguards would need to be put into place to encrypt the transmission, and to properly authenticate the client. Current protocols and technology are in place for this already. **
    4 - (Op preferences, most likely related to #2)

    This sounds as though the op wants to manage their own hardware. Perhaps the op only wants to work on software and rely on existing network connections?
    There is no indication of the desired scope of this project either...
    Will it me a single office solution? Will it extend to larger corporation offices with 100s of users? Will it provide connectivity between offices?
    Or will be be open for anyone to use?

    **Links detailing Authentication and Encryption within a Sip network
  7. shumifan50


    Jan 16, 2014
    The mere fact that the OP asked this question here without any suggested solution would indicate to me that there is most likely a lack of understanding the complexity of what is being attempted, if custom coded. Even using standard open source libraries this will be a major project. I have experienced the difficulties many developers have with maintaining a simple comms connection reliably and these connections will be a lot more complicated to manage. Add to that compression, encryption and protocol(s), memory management and limited processing power in handsets and it would certainly be a very interesting project.
    Somewhere you will need a server to do initial call routing(look up target, check credentials etc etc) otherwise network performance will be crippled, which will be a project on its own.
    You would need voicemail servers, ADC/DAC for voice, call logging, 'SMS' store and forward.
    Security will also be a major issue.

    Or adapt your requirements and use an off the shelf solution like Skype (I don't like it either, but it works). Or use Viber. This just requires getting to know the products you use.
  8. Gryd3


    Jun 25, 2014
    Yes, lots of components could be needed, we will see if the op will help clarify his needs.
    Hopefully it is not the complicated route ;) From the sounds of it, the friends and the op have no idea how deep the water can get.
  9. donkey


    Feb 26, 2011
    I use Viber if that helps, it uses wifi for calls and sms
    if you get really bored I think you will find the devices are out there its just what you need so software side.
    Ios has facetime and works on ipod touch so no sim needed. if you want a program that does not use the web but is for inter office communication only then setup a server for this.
    last but not least I really dislike wifi for no apparent reason. we have enough radio waves going around so maybe an office phone system might be good.
    there are options out there that use outlook or other programs to manage offices, you might want to look into them. I typed "office communicator" into the playstore and number 1 was Lync 2013 which allows voice, video, text chat etc... if you start with that and then run a noticeboard program as well you might just have your issue solved
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