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CIPHERING

  • This topic has 3 replies, 1 voice, and was last updated 13 years ago by Pix.
Viewing 4 posts - 1 through 4 (of 4 total)
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  • #54041 Reply
    MKT
    Guest

    Hi,

    Is there any ADVANTAGE in making the ciphering off in GSM.

    Regards

    #54042 Reply
    MKT
    Guest

    Someone says that the ciphering in a network is kept off to avoid LOADING of network.
    It is not known what loading is referred here.

    This results in a SDCCH relief?
    How? any idea?

    MKT

    #54043 Reply
    fedem
    Guest

    Hi,
    for sure if the network does not start the ciphering procedure at all, you have a relief of your signaling load, of course.

    But if you apply the ciphering procedure with value=”no_ciphering”, the only difference is that you have no ciphering on the radio inreface.
    In fact the ciphering is applied by MS and BTS.
    And the ciphering algorithms are quite simple ususally.
    So there is a little effort and for MS and BTS only in this second case.
    Federico

    #54044 Reply
    Pix
    Guest

    Ciphering procedure is done during the SDCCH phase, meaning that the MSC and the MS agrees on a certain ciphering algorithm. When you say “no ciphering”, it actually means that the A5/0 is going to be used.

    The amount of messages on the SDCCH phase is the same, whether you use a5/0 or a5/1.

    As said by Fedem, the ciphering itself is applied locally by the BTS and the MS, with no (or little?) effort from processors.

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