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{{multiple issues|cleanup=October 2011|notability=October 2011|technical=October 2011}}
The '''COST-Hata-Model''' is a [[radio propagation model]] that extends the urban [[Hata Model]] (which in turn is based on the [[Okumura Model]]) to cover a more elaborated range of frequencies. It is the most often cited of the COST 231 models (EU funded research project ca. April 1986 - April 1996),<ref>http://www.cost.eu/domains_actions/ict/Actions/231 COST (European Cooperation in Science and Technology) website</ref> also called the ''Hata Model PCS Extension''.<ref>
[http://www.lx.it.pt/cost231/final_report.htm Final report for COST Action 231, Chapter 4]
</ref>
 
[[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 accordingly to various experiments and researches.
 
==Applicable To / Under Conditions==
This model is applicable to urban areas. To further evaluate Path Loss in Suburban or Rural Quasi-open/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&nbsp;MHz to 2000&nbsp;MHz
*[[Mobile Station]] [[Antenna (radio)|Antenna]] Height: 1 up to 10m
*[[Base station]] [[Antenna (radio)|Antenna]] Height: 30m to 200m
*Link Distance: 1 up to 20&nbsp;km
 
==Mathematical Formulation==
The COST-Hata-Model is formulated as,
 
<math>L \; = \; 46.3 \; + \; 33.9\log f \; - \; 13.82 \log h_B \; - \; a(h_R) \; + \; [44.9 \;- \;6.55 \log h_B] \log d \; + \; C </math>
 
For suburban or rural enviorenmments:
 
<math>a(h_R)\;=\;(1.1\log f\;-\;0.7)h_R\;-\;(1.56\log f\;-\;0.8)</math>
 
<math>C \; = \; \begin{cases} 0 \; dB \mbox{  for medium cities and suburban areas} \\ 3 \; dB \mbox{  for metropolitan areas} \end{cases}</math>
 
Where,
 
L = [[Median]] [[path loss]]. Unit: [[Decibel]] (dB)
 
f = Frequency of Transmission. Unit: [[Megahertz]] (MHz)
 
h<sub>B</sub> = [[Base Station]] [[Antenna (radio)|Antenna]] [[effective height]]. Unit: Meter (m)
 
d = Link distance. Unit: Kilometer (km)
 
h<sub>R</sub> = [[Mobile Station]] [[Antenna (radio)|Antenna]] [[effective height]]. Unit: Meter (m)
 
a(h<sub>R</sub>) = [[Mobile station]] [[Antenna (radio)|Antenna]] height correction factor as described in the [[Hata Model for Urban Areas]]..
 
==Points to Note==
The European Co-operative for Scientific and Technical research (EUROCOST)
formed the COST-231 working committee to develop an extended version
of the Hata model. COST-231 proposed the following formula to extend Hata's
model to 2&nbsp;GHz. The proposed model for path loss is
 
L50(urban) = 46.3 + 33.9 log fc - 13.82 log {{Not a typo|hte}} - a (hre) + (44.9 - 6.55 log {{Not a typo|hte}}) log d + Cm
where a(hre) is the correction
factor for effective mobile antenna height which is a function of the size of
the coverage area.
          0dB for medium sized city and suburban areas
Cm  =
          3 dB for metropolitan centers
 
        The COST-231 extension of the Hata model is restricted to the following
range of parameters:
 
    f : 1500&nbsp;MHz to 2000&nbsp;MHz
    {{Not a typo|hte}} :3Om to 200m
    hre :lm to lOm
    d :lkm to 20&nbsp;km
 
==Limitations==
This model requires that the base station antenna is higher than all adjacent rooftops.
 
==References==
<references />
 
==See also==
* [[Hata Model for Urban Areas]]
* [[Hata Model for Suburban Areas]]
* [[Hata Model for Open Areas]]
* [[Radio propagation model]]
 
[[Category:Radio frequency propagation]]

Revision as of 05:15, 1 March 2013

Template:Multiple issues The COST-Hata-Model is a radio propagation model that extends the urban Hata Model (which in turn is based on the Okumura Model) to cover a more elaborated range of frequencies. 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 accordingly to various experiments and researches.

Applicable To / Under Conditions

This model is applicable to urban areas. To further evaluate Path Loss in Suburban or Rural Quasi-open/Open Areas, this path loss has to be substituted into Urban to Rural/Urban to Suburban Conversions. (Ray GAO, 09 Sep 2007)

Coverage

Mathematical Formulation

The COST-Hata-Model is formulated as,

L=46.3+33.9logf13.82loghBa(hR)+[44.96.55loghB]logd+C

For suburban or rural enviorenmments:

a(hR)=(1.1logf0.7)hR(1.56logf0.8)

C={0dB for medium cities and suburban areas3dB for metropolitan areas

Where,

L = Median path loss. Unit: Decibel (dB)

f = Frequency of Transmission. Unit: Megahertz (MHz)

hB = Base Station Antenna effective height. Unit: Meter (m)

d = Link distance. Unit: Kilometer (km)

hR = Mobile Station Antenna effective height. Unit: Meter (m)

a(hR) = Mobile station Antenna height correction factor as described in the Hata Model for Urban Areas..

Points to Note

The European Co-operative for Scientific and Technical research (EUROCOST) formed the COST-231 working committee to develop an extended version of the Hata model. COST-231 proposed the following formula to extend Hata's model to 2 GHz. The proposed model for path loss is

L50(urban) = 46.3 + 33.9 log fc - 13.82 log Template:Not a typo - a (hre) + (44.9 - 6.55 log Template:Not a typo) log d + Cm where a(hre) is the correction factor for effective mobile antenna height which is a function of the size of the coverage area.

          0dB for medium sized city and suburban areas

Cm =

          3 dB for metropolitan centers
       The COST-231 extension of the Hata model is restricted to the following

range of parameters:

   f : 1500 MHz to 2000 MHz
   Template:Not a typo :3Om to 200m
   hre :lm to lOm
   d :lkm to 20 km

Limitations

This model requires that the base station antenna is higher than all adjacent rooftops.

References

  1. http://www.cost.eu/domains_actions/ict/Actions/231 COST (European Cooperation in Science and Technology) website
  2. Final report for COST Action 231, Chapter 4

See also