A.17.20.1 Description of the model
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Note 1:
Breakpoint distance dBP'=4hBS'hMS'fc/c, where fc is the centre frequency in Hz, c=3×108 m/s is the propagation velocity in free space, and hBS' and hMS' are the effective antenna heights at the BS and the MS, respectively. The effective antenna heights hBS' and hMS' are computed as follows: hBS'=hBS-hE, hMS'=hMS-hE, where hBS and hMS are the actual antenna heights, and hE is the effective environment height assumed to be hE=1 m.
Note 2:
Break point distance dBP=2πhBShMSfc/c, where fc is the centre frequency in Hz, c=3×108 m/s is the propagation velocity in free space, and hBS and hMS are the antenna heights at the BS and the MS, respectively.
SEAMCAT specific implementation:
hBS=maxhTx, hRx
hMS=minhTx, hRx
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Scenario | LOS probability |
UMa | PLOS=min18d, 1⋅1-exp-d63+exp-d63 |
SMa | PLOS=1, d≤10exp-d-10200, d>10 |
RMa | PLOS=1, d≤10exp-d-101000, d>10 |
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Note: According to Report ITU-R M.2135-1, the LOS probabilities are used only for system level simulations.
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In
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case
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the
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LOS
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probability
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is
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used,
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the
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path
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loss
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is
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computed
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as
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follows:
for a given Tx-Rx distance d:
- compute probability of LoS:
Mathinline body --uriencoded--P_%7BLOS%7D - draw a sample value from uniform distribution
Mathinline body u\ =\ U(0,1) - if
the path is LoS:Mathinline body --uriencoded--u\ <\ P_%7BLOS%7D
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- else the path is NLoS:
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where path losses in the LOS and NLOS conditions (
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A17.20.2 Input parameters
The input parameters for the path loss model ITU-R M.2135-1 are shown in Figure 1 and defined in Table 3.
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Description | Symbol | Type | Unit | Comments |
Variation | σSF | B | dB | Variation in path loss (applies shadow fading) |
Scenario | - | S | - | Urban Macro Cell (UMa), Suburban Macro Cell (SMa) or Rural Macro Cell (RMa) |
Line of Sight | - | S | - | Line of Sight (LOS), Non-Line of Sight (NLOS), or LOS Probabilities |
Street width | W | D | m | Average street width |
Building height | h | D | m | Average building height |
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