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Routing Area Code (RAC)

Viewing 15 posts - 1 through 15 (of 19 total)
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  • #63656 Reply
    Huawei – Man
    Guest

    Hi,

    Routing Area Code (RAC) in Huawei.
    If it is distributed between cells without plan. For example RAC-0 is located between RAC-41.

    In this case how does it affect to network and how should be the RAC planning???

    #63657 Reply
    pix
    Guest

    hello,

    every time the MS reselects a cell which has a new Routing area code or routing area color, then it will do a routing area update.
    impact : signalling load on the SGSN, TBF / PDCH usage on the air interface, etc. it is highly recommended to reduce the number of RA update !

    typical solution :
    within one LAC, use only one RAC : all cells in this LAC shouldshare the same ra code and ra color.

    in next LAC, use another RACode and RAColor.

    regards
    pix

    #63658 Reply
    routing area
    Guest

    Hi,
    I have a question, what are the drawbacks if we use one RAC for whole network?

    #63659 Reply
    pix
    Guest

    i think that there is no problem : there will still be 1 RAC per LAC. Indeed, when there is a change of LAC, even if the RA code and colour are identical, the “routing area identity” is changed
    (RAI = LAC + RAC)

    So it should be safe to do that (1 RAC for the whole network). Any other opinion on the matter are welcome !

    However I never tried this. To play safe, I always preferred to distinguish rAcode and RAcolor between different LAC.

    Regards
    pix

    #63660 Reply
    Huawei – Man
    Guest

    What is difference between Routing Area Code and Color?

    #63661 Reply
    pix
    Guest

    just the way they are broadcasted on the BCCH : color is broadcasted very often, code is broadcasted once in a while only.

    Don’t worry about this too much. The only thing that matters is that code and color are different between 1 RA and all its (immediately) adjacent RA.

    regards
    pix

    #63662 Reply
    Huawei – Man
    Guest

    Does RA update affect to SDCCH overloading?

    #63663 Reply
    pix
    Guest

    huaweiman,

    no, the RA update is done on the PDCH (the MS establishes a UL TBF, etc etc), it is not using a SDCCH channel.

    regards
    pix

    #63664 Reply
    Kamal Kotecha
    Guest

    Hey Pix,
    R u crazy..?! We cannot use same RAC for whole n/w..

    Even inter PAPU RAC should be unique..

    How can whole n/w served by one RAC…? Except your n/w is being served by one papu only…(like my Old city..! he he ..)

    #63665 Reply
    Kamal Kotecha
    Guest

    Did I missed something..?!
    Sry You know Quarter of Smirnoff did that..

    You can use it by implementing LRAS(Large Routing Area Support) feature..!

    #63666 Reply
    pix
    Guest

    kamal,

    read carefully.
    you assign one RA code and colour on the whole network.
    But in the end, one Routing Area is defined by RAI
    RAI = LA code + RA code

    So there are as many RA as there are LA ! Even though only one code is used.

    I hope I am clear.
    and I hope I’m not crazy…

    Now as i said this approach is weird : it *should* work, but I never tried it.

    #63667 Reply
    Yuki Arif
    Guest

    PIX is correct…

    Routing Area Update Procedure is initiated when the mobile change RAI. Not by changing RAC….

    There is one big/famous BSC supplier where the RAC is hard coded to 1.
    Can not be changed…

    #63668 Reply
    Ayat
    Guest

    Hi

    in our case we have 2 LAC with the same ID 9108 but in different BSC in Different MSC

    could you expilan?

    #63669 Reply
    Ashraf
    Guest

    I agree with you pix. It should e safe to use the same RAC for the whole network since you will assign different LAC per BSC/RNC

    #63670 Reply
    santosh nayak
    Guest

    what is PBGT handover what are the parameter

Viewing 15 posts - 1 through 15 (of 19 total)
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