We have already written about 5G technology. Now, happily, we read reports about the first successful tests of 5G networks realized by Nokia Networks and DoCoMo (Japanese carrier). Tests were performed using 28 GHz and 70 GHz bands! Amazing is the fact that in both cases throughputs higher than 2 Gbps were achieved 🙂
The experimental network was built in the Roppongi Hills high-rise complex in Tokyo where Nokia Networks and NTT DoCoMo have checked what can be achieved using new 5G technology. You should remember that 5G networks are based on very high microwave frequencies (even 70 GHz) and it requires application of user tracking techniques, because the beam of an antenna is very narrow. It can not be done in the different way because higher frequency means higher propagation losses, this is the basic law of physics. In order to overcome this issue antennas with very high gains will be used. However, the higher gain of an antenna results in narrower beam. Therefore, antennas used in 5G networks will have 3 degrees beams. For comparison, antennas used in LTE mobile networks have 33, 45, 65, 85 degrees beams.
In our opinion the most interesting is experiment with vehicle moving with 60 km/h speed. This is very challenging scenario for beam tracking algorithm, however 2.5 Gbps throughput was achieved at 28 GHz band 🙂