Voice over WLAN Mobile IP Touch Design Guide R2.0
Calculating Access Point Quantity
•
Drywall building with a theoretical bandwidth of 18 Mbps for 802.11a (-65dBm)
•
Determine Radius & Z factors: R=~11.5m Z=~16.5m Z²=~250m² (approximated with margin of error)
•
Divide the building floor in rectangles and calculate the number of AP by dividing the area of each
rectangle by Z²:
Figure 19: Predictive Method: AP Calculation
Example Results:
Area 1
=> Quantity of AP = (31 x 31)/250 = 3.84 =>
4 AP (rounded up to next highest whole number)
Area 2
=> Quantity of AP = (31 x 96)/250 = 11.9 =>
12 AP
3.8.2. Predictive Tool Coverage Planning
In the interest of easing predictive planning for large sites, or sites not yet fully constructed, several
predictive coverage planning tools are available. These tools focus almost exclusively on the service
requirements of 802.11 data clients with typical power and sensitivity specifications. It is for this reason
that the use of predictive planning tools is not currently recommended by Alcatel-Lucent. Even in the
case of Alcatel-Lucent's predictive planning tool, the unique operational characteristics of MIPT handsets
can not be taken into full consideration, resulting in often flawed and under-engineered proposals.
When the use of such tools is absolutely mandatory, it is recommended that a coverage plan of 160% or
better be used in order to ensure proper plan overlap at the desired -65 dB level. It is assumed that
future versions of predictive coverage planning tools will be more accurate, and capable of calculating
plans based on VoWLAN characteristics.
ESD/ Central Pre Sales / DF/ PH
38/45
January 2007 – Ed 01
