[srslte-users] TDD / NB-IoT / 5G?

[Andre Puschmann]

Hi,

On 28/10/19 16:21, Ralph A. Schmid, dk5ras wrote:
> regarding TDD / NB-IoT / 5G, is there already something usable in srsLTE, or
> are only some prerequisites already done and we need to wait a bit more?

TDD support in srsUE should be working, although we don't usually test
many configurations. Note that in Europe its very uncommon.

The 5G NR code is still not very useful for the broader audience I'd
say, as is 5G in general. What you can do is to write MAC PCAP files and
inspect the 5G MAC/RLC/PDCP PDUs in Wireshark.

The NB-IoT code is really just the synchronization code. Depending on
where you live, however, you may be able to received and sync on a
public NB-IoT carrier. Vodafone, for example, has NB-IoT coverage almost
across Europe. They use different configurations in each country but you
can use `osmocom_fft` to spot the carrier typically in the 800 MHz band
and then use `./lib/src/phy/sync/test/npss_usrp -f freq` to sync on it.
If you have compiled with srsGUI you should be able to see a nice
correlation peak. Note that this example does not correct any frequency
offset so you need to manually fine tune your receiver to the
transmitted signal.

Cheers
Andre