# Okumura Model: Wikis

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# Encyclopedia

Updated live from Wikipedia, last check: May 23, 2013 15:57 UTC (51 seconds ago)

The Okumura model for Urban Areas is a Radio propagation model that was built using the data collected in the city of Tokyo, Japan. The model is ideal for using in cities with many urban structures but not many tall blocking structures. The model served as a base for the Hata Model.

Okumura model was built into three modes. The ones for urban, suburban and open areas. The model for urban areas was built first and used as the base for others.

## Coverage

Frequency = 200 MHz to 1900 MHz

## Mathematical formulation

The Okumura model is formally expressed as:

$L\;=\;L_{FSL}\;+\;A_{MU}\;-\;H_{MG}\;-\;H_{BG}\;-\;\sum{K_{correction}}\;$

where,

L = The median path loss. Unit: Decibel (dB)

LFSL = The Free Space Loss. Unit: Decibel(dB)

AMU = Median attenuation.Unit: Decibel(dB)

HMG = Mobile station antenna height gain factor.

HBG = Base station antenna height gain factor.

Kcorrection = Correction factor gain (such as type of environment, water surfaces, isolated obstacle etc.)

## Points to note

Okumura model does not provide a mean to measure the Free space loss. However, any standard method for calculating the free space loss can be used.