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CIphering activation

Viewing 10 posts - 1 through 10 (of 10 total)
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  • #53005 Reply
    jack
    Guest

    dear
    can any body help me to explain why the ciphering is activated the SDCCH Drop reduce vise versa that I expected it must be increase .

    #53006 Reply
    peyo
    Guest

    i’ve no idea at this time but it’s very interesting. which bss and nss vendors are you using? which ciphering algorithms are you using (sorted by order if several used)?

    When you say that it reduced sd_drop can you give figures or percentage?

    #53007 Reply
    jack
    Guest

    vendor is Huawei
    and SDCCH drop reduce around 24%.algorith is A5/1

    #53008 Reply
    Pan
    Guest

    dear Jack!
    I am thinking that it is because when network does not provide A5/1 ciphering algorithm, then it is mandatory to insert RR_Classmark_enquiry transaction in Location_Updating procedure (In MM_LU_request there is Classmark_1 information element which contains only A5/1 support indication). Hence SDCCH load is increased.
    When A5/1 ciphering algorithm is provided in your network then it is not needs for Classmark_2 information element which contains A5/2 support indication also.

    #53009 Reply
    jack
    Guest

    dear Pan
    what does this message mean (RR_Classmark_enquiry transaction in Location_Updating procedure) I need more explanation .
    BR

    #53010 Reply
    Pan
    Guest

    dear Jack!
    CLASSMARK ENQUIRY message (gsm 04.008) is used in Classmark interrogation procedure (if the information initially sent by the mobile station is not sufficient for network decision (e.g. when A5/1 ciphering not active in network): network want to know A5/2 is supported in MS or not)
    On receipt of the CLASSMARK ENQUIRY message the mobile station sends a CLASSMARK CHANGE message to the network on the main DCCH. This message contains the mobile station classmark 2 information element.

    #53011 Reply
    jack
    Guest

    dear Pan
    Why network want to know i mobile support A5/2 if network already all ciphering algorithm is Deactive

    #53012 Reply
    Pan
    Guest

    Oh, Jack!
    my assumtion was that before activation A5/1 algorithm there is A5/2 algorithm provided in your network only. But really your network does not provided any algorithm before A5/1 activation, doesn’t it?

    #53013 Reply
    jack
    Guest

    pan
    yes there wan no Ciphering

    #53014 Reply
    ali abbas
    Guest

    what is meant by Ciphering on/off.Which algorithm is used for this.

Viewing 10 posts - 1 through 10 (of 10 total)
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