B.4A High speed train conditions

25.1043GPPBase Station (BS) radio transmission and reception (FDD)Release 17TS

High speed train conditions are as follows:

Scenario 1: Open space

Scenario 2: Tunnel with leaky cable

Scenario 3: Tunnel for multi-antennas

The high speed train conditions for the test of the baseband performance are 2 non fading propagation channels (scenario 1 and 3) and 1 fading propagation channel (scenario 2) with one tap. For BS with Rx diversity defined in scenario 1, the Doppler shift variation is the same between anttenas.

For scenario 1 and 3, Doppler shift is given by:

(B.2)

where is the Doppler shift and is the maximum Doppler frequency. The cosine of angle is given by

, (B.3)

, (B.4)

, (B.5)

where is the initial distance of the train from BS, and is BS-Railway track distance, both in meters; is the velocity of the train in m/s, is time in seconds.

For scenario 2, Rician fading is considered where Rician factor, K is defined as the ratio between the dominant signal power and the variant of the other weaker signals.

Doppler shift and cosine angle is given by equation B.2 and B.3-B.5 respectively, where the required input parameters listed in table B.2A and the resulting Doppler shift shown in Figure B.3 and B.4 are applied for all frequency bands.

Table B.2A: Parameters for high speed train conditions

Parameter	Value
	Scenario 1	Scenario 2	Scenario 3
	1000 m	Infinity	300 m
	50 m	–	2 m
K	–	10 dB	–
	350 km/h	300 km/h	300 km/h
	1340 Hz	1150 Hz	1150 Hz

NOTE1: Parameters for HST conditions in table B.2A including and Doppler shift trajectories presented on figures B.3 and B.4 were derived for Band1.

Figure B.3: Doppler shift trajectory for scenario 1

Figure B.4: Doppler shift trajectory for scenario 3