B.3.2 HST-SFN Channel Profile

38.521-43GPPNRPart 4: PerformanceRadio transmission and receptionRelease 17TSUser Equipment (UE) conformance specification

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

There is an infinite number of RRHs distributed equidistantly along the track with the same Cell ID as depicted in figure B.3.2-1.

Figure B.3.2-1: Deployment of HST-SFN

The location of RRH k is given as:

(B.3.2.1)

where: , and is the distance between the RRHs and railway track, while is the distance of two RRHs, both in meters.

The train location is denoted as:

(B.3.2.2)

where: and a means distance in meters, which means the train is right on the track.

The HST-SFN scenario for the test of the baseband performance is a non-fading propagation channel with four taps, namely the four nearest RRHs. Thus, RRH k is visible for the train only in the range:

(B.3.2.3)

Power level (dB) for the signal from k^th RRH, normalized to the total power received from all visible RRHs, is given by:

for (B.3.2.4)

Doppler shift (Hz) from k^th RRH is given by:

for (B.3.2.5)

The relative delay (s) for the signal from k^th RRH can be derived as:

for (B.3.2.6)

In the above v (m/s) is the moving speed of the train, f_C(Hz) is the centre frequency, and C (m/s) is the velocity of light.

Power level, Doppler shift and relative delay are given by equations B.3.2.4 ~ B.3.2.6 respectively, where the required input parameters listed in table B.3.2-1 and the resulting Doppler shift shown in Figures B.3.2-3 and B.3.2-4 are applied for all frequency bands.

Table B.3.2-1: HST-SFN scenario

Parameter	Value
	700 m
	150 m
	500 km/h
	870 Hz for 15 kHz SCS test; 1667 Hz for 30 kHz SCS test

NOTE 1: The trajectories of relative power, Doppler shifts and absolute delays presented in Figures B.3.2-2, B.3.2-3, B.3.2-4 and B.3.2-5 are derived from the equations B.3.2.4 ~ B.3.2.6 respectively.

Figure B.3.2-2 Relative power level trajectories

Figure B.3.2-3 Doppler shift trajectories (= 870 Hz)

Figure B.3.2-4 Doppler shift trajectories (= 1667 Hz)

Figure B.3.2-5 Absolute delay trajectories

Static channel matrix will be used as defined in Annex B.1.