Urban Vehicular 

For each environment the cell geometry (circular or hexagonal) is defined and 

the nominal cell dimension for each environment  

2) 

Defining Service Type 

Voice 

Short Message 

Switched data 

Medium Multi Media etc. 

3) Defining 

Population 

Density 

For each environment type (i.e. In Building, Urban Pedestrian 

etc) 

Population Density (population/sq. km.) 

Penetration rate for each environment and each service 

4) 

Defining Traffic Parameters 

For each environment type (i.e. In Building, Urban Pedestrian 

etc) 

Busy Hour Call Attempts per user 

Average Call Duration 

Activity Factor 

5) 

The method then calculates the following for each environment and 

service: 

Traffic per user 

Offered traffic per cell 

The service channels for the required Quality of Service 

(e.g. blocking rate) 

The total traffic for a cluster of cells based on the cell re 

use factor 

The number of service channels per cluster. 

6) 

Using the system parameters and the number of service channels, the 

number of radio channels is calculated for: 

Each environmental type 

Each service type 

7) 

The total spectrum is the summation of the spectrum requirement for 

the up and down link for each environment and service type.  Finally, 

weighting factors (  

es

) and (   ) applied. 

2.5.2 

Assumptions used in forecasting 

The spectrum calculation is driven by population density and penetration rates 

of the various services in the defined environments.  These are normally 

obtained from demographic and economic data together with market 

assumptions of the take up of the individual services.  

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