• 6.1. Radiokanallar sonini hisoblash.
  • Simsiz tarmoq fanidan 1-2-3-4-5-6-7-8-9-10-11-12-13-14-15 Labaratoriya ishi




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    Simsiz tarmoq fanidan 1-2-3-4-5-6-7-8-9-10-11-12-13-14-15 Labara
    1-2, O`quv amaliyoti Hisoboti, TDA kompleks, 2-Laboratoriya, Лаб №3 Стабилитрон, 1-amaliy, 5-tema, 5-tema, Titullar (2), 1, Tungi lampa, цифровые сотовые системы, 2-Amaliy ish, 49-54 (1)
    Topshiriq uchun variantlari





    ΔF,
    MGs

    Na,
    kishi

    β,
    Erl

    S0, km2

    Puz.BTS, Vt

    GBTS, dB

    hBTS,
    m

    αfBTS, dB

    4

    2,1

    17000

    0,018

    180

    1100

    10

    56

    3

    6.1. Radiokanallar sonini hisoblash.
    Chastotalar kanallarining umumiy soni. Sotali aloqa tarmog‘ini qurish uchun ajratilgan kanallar soni quyidagiga teng bo‘ladi:


    Nk = int(ΔF/Fk) = int(2100/50) = 42 kGs (6.1)

    bu erda int(x) – x sonining butun qismi,


    Fk – sotali aloqa tizimining bitta kanali egallaydigan chastotalar polosasi (UMTS standartida 50 kGs).

    6.2. Bitta BTS ishlatadigan radiokanalar sonini aniqlash.


    Sotaning bitta sektorida abonentlarga xizmat ko‘rsatish uchun ishlatiladigan chastotalar kanallari soni quyidagi formula bo‘yicha aniqlanadi.


    ns = int(Nk/C·Ns) = int(38/3*4) = 3 (6.2)

    bu erda Nssektorlar soni, S – klaster o‘lchami .


    6.3. Ruxsat etiladigan telefon yuklamasini hisoblash.


    Bitta sotaning bitta sektoridagi ruxsat etiladigan telefon yuklamasi quyidagi nisbat orqali aniqlanadi:


    (6.3.1)

    bunda quyidagi shart bajarilishi kerak:




    => = 0.46
    (6.3.2)

    bu erda PB – chaqiruvni bloklanishi ehtimolligi, PB =0,11.


    Agar ildiz ostidagi qiymat RV qiymatidan katta bo‘lsa, u holda PB =0,11 olinadi.
    => (6.3.3)

    6.4. Bitta BTS xizmat ko‘rsatadigan abonentlar sonini aniqlash


    Eng katta yuklama soatida berilgan bitta abonentning aktivligida bitta BTS xizmat ko‘rsatadigan abonentlar sonini quyidagi formula bo‘yicha hisoblash mumkin:

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