Which frequency band is the most suitable for RIS deployment? Have RIS-aided systems the same advantages for low frequency bands such as 800 MHz/2 GHz and high frequencies such as mmWave/THz bands?
Nasr Alkhafaji
, Dear, thanks for your answer, however, I'm still wondering what could be the benefits of employing LISs in bands such as 800 MHz/2 GHz and high frequencies such as mmWave/THz bands. Could you, please, give me some benefits on both bands? Thanks!
Nasr Alkhafaji
: What has 6G to do with 95GHz to 3THz? 6G might support that frequency range, but just as previous generations, 6G will mainly make use of sub-6 GHz frequencies and then support some higher bands in special cases. It is the same thing with 5G. Almost all the current 5G networks make use of the 3 GHz band. mmWave bands will also be used in some cases, but it won't be the main thing.
Felipe Augusto Pereira de Figueiredo: There are hardware concepts for all of these ranges. I think it is too early to say where it will be most useful, but here are my speculations: At lower frequencies, there is existing relaying technology that is rather competitive and the propagation conditions are quite good. I think it is at mmWave frequencies and above that the RIS technology can do something new: 1) add extra propagation paths to sparse channels; 2) replace the need for large antenna arrays, since large arrays are complicated to build; 3) conventional relays might not be available.
Many thanks, Prof. Emil Björnson , your answer sheds a lot of light on the subject, however, I'm still confused about lower frequency bands. If I understood correctly, the existing relaying technologies are preferred over LIS, isn't it? If that is so, would there be a good advantage for using RIS at such bands (e.g., instead of SNR improvement it could be used for increasing the diversity)?
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