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Conditions for Okumura and Hata models

Short answer

Okumura: 150-1920 MHz, 1-100 km, hte 30-1000 m, hre up to 10 m, quasi-smooth terrain, urban/suburban/open curves. Hata: 150-1500 MHz, 1-20 km, hte 30-200 m, hre 1-10 m, macrocell only; COST-231 extends to 2 GHz.

What are the necessary conditions for Okumura and Hata Model?

Both models are empirical, so they are valid only within the range of the measurements on which they are based.

Okumura model

  • Frequency: 150 MHz to 1920 MHz (often extrapolated up to 3000 MHz).
  • Distance: 1 km to 100 km between transmitter and receiver.
  • BS antenna effective height (hte): 30 m to 1000 m.
  • Mobile antenna height (hre): reference 3 m, correction for up to about 10 m.
  • Terrain should be quasi-smooth; corrections are needed for hilly terrain, water, slope, etc.
  • Environment must be classed as urban, suburban or open area; correction curves (Amu, GAREA) are read for these.

Hata model

  • Frequency (fc): 150 MHz to 1500 MHz.
  • BS antenna height (hte): 30 m to 200 m.
  • Mobile antenna height (hre): 1 m to 10 m.
  • Distance (d): 1 km to 20 km.
  • Suited to large-cell (macrocell) systems; not suitable for personal communication systems with cell radius about 1 km. For 1500–2000 MHz, the COST-231 extension is used.
ParameterOkumuraHata
Frequency150–1920 MHz150–1500 MHz
Distance1–100 km1–20 km
hte30–1000 m30–200 m
hreup to 10 m1–10 m
FormCurves + formulaClosed-form formula

✓ Answer checked by Claude Opus 5.5 (high effort)

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