B.3A HST-SFN scenario
36.1013GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Release 18TSUser Equipment (UE) radio transmission and reception
There is an infinite number of RRHs distributed equidistantly along the track with the same Cell ID as depicted in figure B.3A-1.
Figure B.3A-1: Deployment of HST-SFN
The location of RRH k is given as:
(B.3A.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.3A.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.3A.3)
Power level 
(dB) for the signal from kth RRH, normalized to the total power received from all visible RRHs, is given by:
for 
(B.3A.4)
Doppler shift 
(Hz) from kth RRH is given by:
for 
(B.3A.5)
The relative delay 
(s) for the signal from kth RRH can be derived as:
for 
(B.3A.6)
In the above v (m/s) is the moving speed of the train, fC (Hz) is the center frequency, and C (m/s) is the velocity of light.
Power level, Doppler shift and relative delay are given by equations B.3A.4 ~ B.3A.6 respectively, where the required input parameters listed in table B.3A-1 and the resulting Doppler shift shown in Figure B.3A-3 are applied for all frequency bands.
Table B.3A-1: HST-SFN scenario
|
Parameter |
Value |
|
|
1000 m |
|
|
50m |
|
|
350 km/h |
|
|
872 Hz |
NOTE 1: Parameters for HST-SFN scenario in Table B.3A-1 including
and Doppler shift trajectories presented in Figure B.3A-2 were derived from Band 7 and are applied for performance verification in all frequency bands. And the trajectories of ralative power, Doppler shifts and relative delay presented in Figures B.3A-2~ B.3A-4 are derived from the equations B.3A.4 ~ B.3A.6 respectively.
Figure B.3A-2 Ralative power level trajectories
Figure B.3A-3 Doppler shifts trajectories
Figure B.3A-4 Relative delay trajectories
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 
.
For 2×4 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 
.