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The COST Hata model is a radio propagation model (i.e. path loss) that extends the urban Hata model (which in turn is based on the Okumura model) to cover a more elaborated range of frequencies (up to 2 GHz). It is the most often cited of the COST 231 models (EU funded research project ca. April 1986 – April 1996),^{[1]} also called the Hata Model PCS Extension.^{[2]}
COST (COopération européenne dans le domaine de la recherche Scientifique et Technique) is a European Union Forum for cooperative scientific research which has developed this model based on experimental measurements in multiple cities across Europe.
Contents
Applicable to / under conditions
This model is applicable to macro cells in urban areas. To further evaluate Path Loss in suburban or rural (quasi)open areas, this path loss has to be substituted into Urban to Rural / Urban to Suburban Conversions. (Ray GAO, 09 Sep 2007)
Coverage
 Frequency: 1500–2000 MHz
 Mobile station antenna height: 1–10 m
 Base station antenna height: 30–200 m
 Link distance: 1–20 km
Mathematical formulation
The COST Hata model is formulated as,
where,
Median path loss. Unit: decibel (dB)  
Frequency of Transmission. Unit: megahertz (MHz)  
Base station antenna effective height. Unit: meter (m)  
Link distance. Unit: Kilometer (km)  
Mobile station antenna effective height. Unit: meter (m)  
Mobile station antenna height correction factor as described in the Hata model for urban areas.
For suburban or rural environments this factor is defined as,
and, for urban environments (i.e. large cities) as,
 
Constant offset. Unit: decibel (dB). Defined as,

Limitations
This model requires that the base station antenna is higher than all adjacent rooftops.
References
 ^ http://www.cost.eu/domains_actions/ict/Actions/231 COST (European Cooperation in Science and Technology) website
 ^ Final report for COST Action 231, Chapter 4