How can I do this simulation? Where do I need to log in? What tools do I need to install? Thank you.

One thing you could have mentioned in the 4G & 5G networks are IPv6 and often exclusively so. My cell phone is IPv6 only, but uses 464XLAT to connect to IPv4 only sites.

You seem to be confusing two issues. Higher frequencies take more energy to provide the same signal strength, all else being equal. However, antenna gain can be used to compensate for the path loss. The engineer will look at available power, required signal strength and path loss and then determine the antenna gain needed.

Originally, FDD was used because it was simpler to implement and since cell phones were used mainly for voice calls, upstream and downstream had fairly symmetrical bandwidth. However, this changed with phones being used more and more for Internet data which is generally not symmetrical. Also, precision timing is required with both FDD & TDD. With my cell carrier, all 5G uses TDD, but 4G can be either. 2G & 3G were always FDD.

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Great explanation!!

Great and simple explanation

Amazing videoo!!! in TDD mode do we transmit CSI-RS or it is based on SRS only for channel estimation?

So if I were to try to set up an antenna for my 5G n260 capable modom...would it not be a good idea to use a singular parabolic antenna with a wr28 to coaxial adapter on the back and then connect that to my modem? Are you saying it has to be an array with smaller elements due to the nature of the frequencys wave?