• GGSN 1 GGSN 2 GGSN 3 (2G/3G) SGSN Example DNS configuration for Gn: * APN 1= route to GGSNs 1,2 or 3
  • * Web/WAP browser settings => use APN 1 * MMS client settings => use APN 1 * Streaming player settings => use APN 2 3.6- rasm.
  • Raqamli mobil aloqa




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    PDP-context
    activation
    with APN 1 or 2
    DNS
    AP for
    APN 1
    AP for
    APN 2
    AP for
    APN 1
    AP for
    APN 2
    AP for
    APN 1
    Logical
    reference
    point
    Gn
    Logical reference
    point Gn
    GGSN 1
    GGSN 2
    GGSN 3
    (2G/3G)
    SGSN
    Example DNS configuration for Gn:
    * APN 1= route to GGSNs 1,2 or 3
    * APN 2= route to GGSNs 1 or 2
    APN to GGSN mapping done with e.g.
    DNS round-robin load balancing method
    Example terminal setting:
    * Web/WAP browser settings => use APN 1
    * MMS client settings => use APN 1
    * Streaming player settings => use APN 2
    3.6- rasm. APNni DNSga bog‘liqligi.


    46
    Yuqorida ta’kidlab o‘tilganidek, dunyoda 3G standartlarining 
    asosiy ikki oilasi: W-CDMA (UMTS, FOMA) hamda CDMA-
    2000 texnologiyalari asosidagi tizimlari mavjud. UMTS standarti 
    asosan Yevropada, FOMA Yaponiyada, CDMA-2000 esa Amerika 
    va Osiyo qit’alarida tarqalgan. Shuningdek, asosan Xitoyda tarqal-
    gan TD-SCDMA standarti ham 3G texnologiyalari oilasiga kiradi. 
    Mobil aloqa qurilmalarini ta’minlovchilarning global uyush-
    masi – GSA (ingl. Global Assocuation of Mobile Suppliers)ning 
    ma’lumotlariga ko‘ra, 2011-yilning may oyida butun dunyodagi 
    3G va 3,5G tarmoqlari soni 710 tani tashkil etgan, bu esa dunyo-
    dagi barcha sotali aloqa tarmoqlarining 25% ni tashkil etgan [21]. 
    Bunda 400 ta tarmoq W-CDMA texnologiyasi asosida qurilgan 
    bo‘lib, ushbu tarmoqlardagi abonentlar soni 684 mln ni tashkil 
    etgan. Shu bilan birga 323 tadan oshiq tarmoqlar CDMA-2000 
    standartlar oilasi asosida qurilgan va ularda abonetlar soni 561mln 
    ni tashkil etgan. Shu jumladan 245 ta tarmoq EV-DO (Rel.0, 
    Rev. A,B) standarti asosida qurilgan [22]. 

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