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A17.21.1 Description of the model

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Breakpoint distance

Mathinline
body --uriencoded--%7B\ d%7D_%7BBP%7D%5e\prime=4h_%7BBS%7D%5e\prime h_%7BMS%7D%5e\prime f_c/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. For UMi, hE=1 m. For UMa, hE=1 m with a probability equal to 

Mathinline
body --uriencoded--1/(1+C(d_%7B2D%7D,\ h_%7BMS%7D))\

1/(1+C(d2D, hMS))   and chosen from a discrete uniform distribution uniform (12,15,…,(hMS-1.5)) otherwise.

With C(d2D, hMS) given by
Cd2D, hMS= 0, hMS<13 hMS-13101,5gd2D, 13 ≤hMS≤23
where
gd2D= 0, d2D≤18 54d2D1003exp-d2D150, 18<d2D ;

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Note that hE depends on d2D and hMS and thus needs to be independently determined for every link between BS sites and MSs. A BS site may be a single BS or multiple co-located BSs.

3-D distance is defined as:d3D=d2D2+hBS-hMS2

Mathinline
body --uriencoded--d_%7B3D%7D=\sqrt%7Bd_%7B2D%7D%5e2+\left(h_%7BBS%7D-h_%7BMS%7D\right)%5e2%7D

 

Note 2:
fc denotes the center frequency normalized by 1 GHz, all distance and height related values are normalized by 1 m, unless it is stated otherwise.

Note 3:
UMa NLOS pathloss is from TR 36.873 with simplified format and PLUMa-LOS is equal to pathloss of UMa LOS outdoor scenario.

Note 4:
PLUMi-LOS is the pathloss of UMi-Street Canyon LOS outdoor scenario.

Note 5:
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

Mathinline
body --uriencoded--h_%7BBS%7D=\max%7B\left(h_%7BTx%7D,\ h_%7BRx%7D\right)%7D

Mathinline
body --uriencoded--h_%7BMS%7D=\min%7B\left(h_%7BTx%7D,\ h_%7BRx%7D\right)%7D

Table 2: LOS Probability

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Note:

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The

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LOS

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probability

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is

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derived

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assuming

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antenna

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heights

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of

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3

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m

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for

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indoor,

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10

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m

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for

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UMi

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and

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25 m

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for

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UMa.

In case the LOS probability is used, the path loss is computed as follows:

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The input parameters for the path loss model 3GPP TR 38.901 are shown in Figure 1 and defined in Table 3.

Anchor_Ref507762590
_Ref507762590Figure 1: GUI of the 3GPP TR 38.901 path loss model
Anchor_Ref507762636_Ref507762636

Table 3: Parameters of the 3GPP TR 38.901 Path loss model

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