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3g related informations

Viewing 15 posts - 1 through 15 (of 34 total)
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  • 14th August 2006 at 07:46 #45600
    muhammad Arshad
    Guest

    Dear All,

    I would like to start discusions on 3G RELATED INFORMATION IN THIS POSTING.
    So that we people update ourselves.
    Kindly post your queries.

    Md.Arshad

    16th August 2006 at 11:00 #45601
    Francis Idachaba
    Guest

    Dear all,
    With the increase in 3g networks based on CDMA what happens to all the GSM infrastructure.

    Francis Idachaba

    17th August 2006 at 12:09 #45602
    yogesh_rf
    Guest

    hi guys ,
    I am a Senior GSM Optimization Engineer and i would also like to join you all in 3G related discussions

    BR//
    yogesh_rf@yahoo.com

    17th August 2006 at 19:14 #45603
    DJ
    Guest

    Doesnt matter CDMA/GSM …for 3G you have to spent equivalent amount.

    Rgds

    19th August 2006 at 07:41 #45604
    avi
    Guest

    hi all,

    i have a question, i india the GSM 2.5G system is working but and i read that initially when the 3G deployment starts the 2.5G core network will be used for supporting 3G. I just want to know how that is going to happen, and weather that will differ from vendor to vendor.

    19th August 2006 at 07:56 #45605
    Muhammad Arshad
    Guest

    Dear Francis,
    In 3G, the transport network is based on WCDMA but the core will become softswitch based which separate the payload from control layer.so the core portion we can reutilise from GSM.

    muhammad arshad

    19th August 2006 at 08:05 #45606
    MUHAMMAD ARSHAD
    Guest

    Dear AVI,
    I think you r benifitted by my reply to Francis.
    Moreover,in 3G We will replace BSCs by RNC and BTS by Node B.The work of MSC is distributed in MSC Server(control part)and Media Gateway(traffic or payload).
    The remaining Core network remains to be same i mean to say HLR,EIR etc.We may have many ways to migrate from 2.5G to 3G.
    By the way with whom you r working in INDIA

    Muhammad Arshad

    19th August 2006 at 08:47 #45607
    Avi
    Guest

    Dear Arshad,
    thanks,
    this reply seems to have made the things clear. rest i can get from the manuals.
    I am working for Alcatel BSS in india.
    I think the answer is specific to nokia system.

    22nd August 2006 at 06:58 #45608
    Avi
    Guest

    Hi all,
    please explain the difference between cannelisation code and scrambling cone in WCDMA. specially their function in uplink and downlink.

    22nd August 2006 at 07:57 #45609
    muhammad arshad
    Guest

    Dear AVI,

    Channelisation codes can increase signal bandwidth using orthogonal codes while scrambling does not effect the signal bandwidth using pseudo noise codes.
    In D/L chanelisation codes can separate diff users in the one cell/sector
    In U/L IT CAN ONLY SEPARATE THE PHYSICAL CHANNELS/SEVICES OF ONE USER BECAUSE THE MOBILES ARE NOT SYNH. IN TIME
    To avoid interference between users scrambling codes are used

    muhammad arshad
    arshad6977@yahoo.com

    22nd August 2006 at 09:20 #45610
    Avi
    Guest

    hi arshad,
    thanks for the reply.
    i have one more question, in WCDMA the UE r not synchronised to the Network. how does this work?

    22nd August 2006 at 09:47 #45611
    avi
    Guest

    hi all,
    what is the difference between a dedicated user channel and a physical channel. in case of WCDMA air interface.

    22nd August 2006 at 10:00 #45612
    avi
    Guest

    “In downlink user channels are seperated by channelisation code”

    “in uplink terminals are seperated by scrambling code”

    are these two lines trying to explain the same functions performed in uplink and downlink if not what is the difference in the two lines.

    23rd August 2006 at 12:16 #45613
    md. arshad
    Guest

    It is possible that two mobiles are using same chanelising code so in order to separate diff. users in the uplink, scrambling code are used.
    dedicated ch. reserved for a single user, supporting fast power control and soft HO.
    common channel can be used by any user

    25th August 2006 at 11:20 #45614
    Govindaraj
    Guest

    Hi,

    Any one can Explain the Node B comissioning procedure…….

    Is it same like Ultrasite comissioning or what will be difference in hardware point of view…

    Thanks

    Govindaraj
    Hyderabad

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