B.3 High speed train conditions
25.1423GPPBase Station (BS) conformance testing (TDD)Release 17TS
High speed train conditions are as follows:
Scenario 1: Open space
Scenario 3: Tunnel for multi-antennas
The high speed train conditions for the test of the baseband performance are two non-fading propagation channels in both scenarios.
Doppler shift for both scenarios is given by:
(B.1)
where is the Doppler shift and
is the maximum Doppler frequency. The cosine of angle
is given by:
,
(B.2)
,
(B.3)
,
(B.4)
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.
Doppler shift and cosine angle is given by equation B.1 and B.2-B.4 respectively, where the required input parameters listed in table B.6 and the resulting Doppler shift shown in Figure B.1 and B.2 are applied for all frequency bands.
Table B.6: Parameters for high speed train conditions
Parameter |
Value |
|
Scenario 1 |
Scenario 3 |
|
|
1000 m |
300 m |
|
50 m |
2 m |
|
350 km/h |
300 km/h |
|
1310 Hz |
1125 Hz |
NOTE1: Parameters for HST conditions in table B. including and Doppler shift trajectories presented on figures B.1 and B.2 were derived for Band a).
Figure B.1: Doppler shift trajectory for scenario 1
Figure B.2: Doppler shift trajectory for scenario 3
Annex C (normative):
Global in-channel Tx test