C.2 FR1 Base Station beam configuration
38.1513GPPNRRelease 17TSUser Equipment (UE) Multiple Input Multiple Output (MIMO) Over-the-Air (OTA) performance requirements
The emulated BS beam configuration to be used for all emulation of channel models defined in Annex C.1 is specified in this clause.
The Base Station beam configuration includes basic antenna parameters and beamforming characteristic. The basic BS antenna parameters is defined in Table C.2-1.
Table C.2-1: BS Antenna Parameters
|
Parameter description |
Symbol |
Parameter value |
|
|
FR1 ≤2.5GHz |
FR1 >2.5GHz |
||
|
Antenna panels in vertical dimension |
Mg |
1 |
1 |
|
Antenna panels in horizontal dimension |
Ng |
1 |
1 |
|
Elements per panel in vertical dimension |
Me |
4 |
8 |
|
Elements per panel in horizontal dimension |
Ne |
8 |
8 |
|
Number of polarizations per panel |
P |
2 |
2 |
|
Element spacing in horizontal dimension (λ) |
dH |
0.5 |
0.5 |
|
Element spacing in vertical dimension (λ) |
dV |
0.5 |
0.5 |
Antenna element radiation patterns, including orientation of the element main polarization components as well as orientation of the antenna array are as in the example pattern in Table 7.3-1 of TR38.901. The antenna element has ±45 polarization components and the radiation pattern parameters are 3dB = 65, 3dB = 65, Amax = 30dB, SLAv = 30dB, GE,max =8 dBi.
The beamforming characteristic of the FR1 BS pattern is defined as follow:
– A code book of 60 fixed beams is constructed to a grid of five elevation angles from –20° to +20° with 10° steps and 12 azimuth angles from –80° to +80° with ~15° steps；
– For 4×4 MIMO OTA, two strongest transmitting beams are selected from the pre-defined beam grid based on their proximity to the strong clusters of each FR1 channel model. These beams should have different azimuth directions and can provide the highest receive power for UE.
– For 2×2 MIMO OTA, 1 strongest transmitting beam is selected from the pre-defined beam grid which provides the highest received power for UE based on the FR1 channel model.
– Beam directions for channels model given in Annex C.1 are:
– For UMa CDL-C, the beam directions are:
– Strongest beam: AoD: -7.27°, ZoD: 100°
– 2nd strongest beam: AoD: -21.82°, ZoD: 100°
– For UMi CDL-C, the strongest beam direction is: AoD: -7.27°, ZoD: 100°.