On 2022-01-24 20:53, LoyCurtis Smith via USRP-users wrote:
My system setup is as follows:
* 2 x USRP x310 with CBX-120 daughterboard
* 2 x Ubuntu 18.04 workstation
* 2 x Taoglas 45.8113 antenna
* 2 x Internal Reference Clock (Master Clock set at 184.32 MHz)
* 2 x Internal Time source
* 2 x Connected via 1 Gig-E interfaces
* 2 x Using UHD 4.1
The devices have been in two setups: stacked and a few inches apart.
I am attempting to deploy a 5G network using the openairinterface
(OAI) software system. Both devices synchronize initially, then they
fail. With openairinterface, I am using frequency offset compensation
at the UE. Its a useful parameter when running over the air and/or
without an external clock/time source
(https://gitlab.eurecom.fr/oai/openairinterface5g/blob/develop/doc/RUNMODEM.md)
Is there a way to synchronize the reference clock/timing of both USRP
x310s over the air? In the future, I will be attempting to connect a
third USRP x310. My setup will include one base station and two user
devices.
V/r
LoyCurtis Smith
Unless OAI provides some mechanism for that, the answer would be no.
You need a shared reference clock.
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