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laforge, 07/12/2023 09:10 AM
5G NTN¶
In 3GPP release 17, the so-called non-terrestrial networks were introduced. NTN is a generic term that encompasses satellites (GEO, LEO) as well as high-altitude vehicles.
Frequencies¶
The two initial frequency band groups specified by 5G NTN are called FR1 and FR2.
5G NTN FR1¶
There are two specified 5G NR bands in NTN FR1: n255 (L-Band) and n256 (S-Band).
| Band | Common name | Uplink | Downlink | Duplex spacing |
|---|---|---|---|---|
| n255 | L-Band | 1626.5-1660.5 | 1525-1559 | -101.5 |
| n256 | S-Band | 1980-2010 | 2170-2200 | 190 |
Deployed networks¶
Bullitt¶
One of the first commercial 5G NTN deployments appears to be Bullitt Sattelite who are apparently renting transponder capacity on existing Echostar (S-Band, Europe) and Inmarsat (L-Band) GEO sattelites. Given that those (Like Echostar XXI) are in orbit for many years, they presumably are just traditional "bent pipe" sattelites.
Echostar also appears to be in the process of setting up a separate 28-LEO-sattelite constellation just for NTN, where the actual gNB (or at least part of it) is in the sattelite itself. That's not deployed as of now (2023).
Updated by laforge 10 months ago · 1 revisions
