High path loss in 3 GHz so for DL coverage you should have almost same physical condition so that you can manage UL coverage of 4G in NSA.
Same reason as above you have restricted UL/DL in SA, so that you should keep transmitter near to clutter as you are not going to get > 300m -400m coverage in 3GHz SA
Horizontal and Vertical beams you can manage softly in 5G so clutter height will not disturbe you w.r.t 4G.
As NSA use smart antennas instead of passive which are capable of beam forming so while installing antenna for NR need to be more careful to mitigate in.terference between beams.
Hello,
I have seen both here in Spain, and the criteria is unclear, as every operator is different, and even an operator has a different criteria depending on the site.
They seem to agree in an antenna migration to be able to allocate new frequencies. Most of the 3G is being migrated to mixed mode 3g/4g.
What we see here mostly is NSA. IOT cells I have seen so far are B20, defined on some LTE basebands.
So the old antennas are being migrated to be able to allocate mixed frequencies on a baseband system, and they add active antennas probably aiming at 5G SA, even if it’s NSA actually.
A matter of opinions really. You can keep height of 5G antennas similar to 4G antennas, but if you can’t and you need to stack them then I prefer to put 5G antenna above a 4G passive antenna, for following reasons:
Our 3.5GHz spectrum allocation has much larger bandwidth than a remaining 4G, thus the biggest throughput contributor is at “prime location”.
3GHz band has worse link budget, thus again should be higher to risk less obstructions than lower bands.
3GHz band has worse diffraction, ie waves “propagate less” behind obstacles, diffraction angle matters, at least in theory.
If you are using MaMIMO, then such antenna typically has much larger “scanning” range with your beams, thus it’s better to place it higher to avoid rooftop clipping…in a case you are not at the roof edge, but somewhere at a center.
Latest MaMIMO antennas are smaller and lighter than multiband 4G antennas, thus if you need to put one antenna higher… it’s easier to choose 5G.