Page 153 - Integrated Wireless Propagation Models

M a c r o c e l l P r e d i c t i o n M o d e l s - P a r t 2 : P o i n t - t o - P o i n t M o d e l s 131

Monitor
BT device

Forest
(Spring, dense leaves)

Slope
Forest region Higher loss
(as compared to Winter)

Radial distance
FIGURE 3.1.5.2.11 Dynamics of the Lee mod l.
e

energy by the leaves. The coverage can quickly shrink, and associated network engineer­
ing issues arise, as shown in Fig. 3.1.5.2.11.
As weather changes, the leaves on trees also change. Through autumn and winter,
the forest becomes thinner and thinner. The forest can be better penetrated, and the
associated network engineering also needs to be adjusted.
As we can see, the morphology factor has become more important in engineering
today. It is important to have an intelligent algorithm that can work with measured data
and also be able to link with the network engineering. The Lee model provides an inte­
grated system solution for dealing with the morphology issue. As more morphology data
become available, more effective and efficient means of doing network engineering
become possible. Thus, it is important for cellular engineering to consider the factors of the
morphology and to develop the algorithms and processes for dealing with these factors.

3 . 1 . 6 Water Enhancement
An optional water enhancement is available for use with any of the three modes of the
Lee macrocell model. Like effective antenna height gain, water enhancement behaves
as an additional attenuation factor that is applied to the calculation of the Lee model for
determining signal strength.
When water enhancement is turned on, the Lee model checks to see if the mobile is
located on land but receives both reflected waves, one from water and one from land,