B.3 High speed train scenario
36.521-13GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Part 1: Conformance testingRadio transmission and receptionRelease 17TSUser Equipment (UE) conformance specification
The high speed train condition for the test of the baseband performance is a non fading propagation channel with one tap. Doppler shift is given by
(B.3.1)
where is the Doppler shift and
is the maximum Doppler frequency. The cosine of angle
is given by
,
(B.3.2)
,
(B.3.3)
,
(B.3.4)
where is the initial distance of the train form eNodeB, and
is eNodeB Railway track distance, both in meters;
is the velocity of the train in m/s,
is time in seconds.
Doppler shift and cosine angle are given by equation B.3.1 and B.3.2-B.3.4 respectively, where the required input parameters listed in table B.3-1 and the resulting Doppler shift is shown in Figure B.3-1 are applied for all frequency bands.
Table B.3-1: High speed train scenario
Parameter |
Value |
|
300 m |
|
2 m |
|
300 km/h |
|
750 Hz |
NOTE 1: Parameters for HST conditions in table B.3-1 including and Doppler shift trajectories presented on figure B.3-1 were derived from Band7 and are applied for performance verification in all frequency bands.
Figure B.3-1: Doppler shift trajectory
For 1×2 antenna configuration, the same h(t,τ) is used to describe the channel between every pair of Tx and Rx.
For 2×2 antenna configuration, the same h(t,τ) is used to describe the channel between every pair of Tx and Rx with phase shift according to .