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3.3
Method of determining the number of base stations
according to predicted traffic
This method allows you to determine the number of base stations required to provide service in a
coverage area.
Proceed as follows:
1
Identify the traffic areas and divide them into two categories:
•
Homogeneous traffic areas
A homogeneous traffic area consists of radio areas located within the same geographic
sector that generate the same level of traffic (building or floor where users generate a
generally constant level of traffic, without leaving this sector).
•
Special traffic areas
A special traffic area consists of radio areas located within a given sector, where the traffic
level varies from one radio area to the next (meeting room, cafeteria).
2
For each homogeneous and special radio area, the following parameters must be obtained
from the customer:
•
N: total number of mobile DECT users.
•
Z: number of radio areas in the traffic area.
•
m : the mobility of users within a given traffic area.
Mobility is defined for each user based on information provided by the customer during the
interview. Mobility, "m", may have the following values:
•
low: mobiles tend to stay within their reference areas.
•
medium: intermediate.
•
high: mobiles often stay outside their reference areas.
• e: traffic in Erlangs per mobile.
• low = 0.04
If the customer does not know the exact user traffic in minutes per hour, the table below,
giving typical traffic levels for various business functions, may be used as a guide to
estimate the average traffic.
Low ( < 5 min./h)
Average (from 5 to 10 min./h)
High (from 10 to 20 min./h)
Table2: Determining the average traffic of the various types of activity
The traffic level given is busy hour traffic.
AMT/PTD/PBX/0020/2/4/EN
medium = 0.12
Traffic per mobile
01/2007
high = 0.2
Business function
hotel
school
work yard
retail store
plant
advertising agency
hospital centre; locations close to operating
theaters
law firm
real estate agency
stock broker
garage, workshop reception (20/25 min./h)
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