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

[Justin Tallon]

Hey Antonio!

This feature is a part of the standard of LTE as it is needed to
synchronize the Downlink and the Uplink, it is called Time Advance and it
appears in the rach_detected() function in srsenb/src/mac/mac.cc .
 You could print it to a file during the attach procedure directly from
this function.

Hope this helps!

Regards,
Justin
____
Justin Tallon Ph.D.

Software Radio Systems (SRS)
http://www.softwareradiosystems.com

+353-86-067-0753 | justin.tallon at softwareradiosystems.com


On Mon, Dec 3, 2018 at 9:16 AM Antonio Albanese <antonioalbanese15 at gmail.com>
wrote:

> 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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