[srslte-users] Measuring propagation time between srsLTE and a commercial UE

[Antonio Albanese]

Hello everyone,

I need to measure the propagation time between a srsLTE eNB and a
commercial UE.
My initial idea was to measure the Round Trip Time of a couple of exchanged
messages by looking at the eNB pcap file. Apparently, the CPU time is
dominant (leading to a RTT of around 1 ms in my lab environment) and I
could not figure out how to discard it. Indeed, I doubt it would be even
possible to do it using a commercial UE.

My current idea is to use the built-in synchronization module of srsLTE to
get a measure of the time offset between eNB and UE. I am having a closer
look at the physical layer functions but it takes me a lot of time to
understand the reasoning behind most of them.

Has anyone tried to measure the time offset this way before? Do you have
any other suggestion on how to do do it?

Thanks a lot!
Antonio
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