WINNER II pdf - Final Report - Cept

WINNER II D1.1.2 V1.2
The NLOS path loss model for scenario B1 is dependent on two distances, d 1 and d 2 . These distances are
defined with respect to a rectangular street grid, as illustrated in Figure 4-3, where the MS is shown
moving along a street perpendicular to the street on which the BS is located (the LOS street). d 1 is the
distance from the BS to the centre of the perpendicular street, and d 2 is the distance of the MS along the
perpendicular street, measured from the centre of the LOS street.
+
MS
d
2
d 1
BS
d
2
-
Figure 4-3 Geometry for d 1 and d 2 path-loss model
4.3.1 Transitions between LOS/NLOS
The WINNER channel model allows transitions between different propagation conditions, the most
important of which are transitions between LOS and NLOS within the same WINNER scenario. In the A1
(indoor) and B1 (urban microcell) scenarios, transitions from LOS to NLOS can occur as a result of the
MS turning from the corridor or street in which the BS is located (the LOS corridor/street) into a
perpendicular corridor or street. An analysis of this specific case has indicated that such transitions can be
adequately modelled by using the A1 or B1 LOS and NLOS path loss models defined in Table 4-4. Let d 1
and d 2 denote the distances along the LOS corridor/street and the perpendicular corridor/street,
respectively, as illustrated in Figure 4-3. The A1 LOS path loss model is then considered to be applicable
for values of d 2 smaller than 3F 1 , where F 1 represents the radius of the first Fresnel zone (for definition of
Fresnel zones see [Sau99, sec 3.3.1] ). For values of d 2 greater than 3F 1 , the A1 NLOS path loss model
can be used. For the B1 scenario, a better fit to measured data was obtained by choosing the NLOS/LOS
transition distance equal to 10F 1 . It is noted that, in most cases, reasonably good results can also be
obtained by setting the transition distance equal to half the width of the LOS corridor or street, as
reflected by the path loss model for B1 NLOS in Table 4-4.
4.4 Parameter tables for generic models
Table 4-5 provides parameter values corresponding to the WINNER generic channel models. Parameter
values related to elevation angles are provided in Table 4-6.
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