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.
Frequency = 200 MHz to 1900 MHz
The Okumura model is formally expressed as:
Kcorrection = Correction factor gain (such as type of environment, water surfaces, isolated obstacle etc.)
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.