Richard, (I am cc:ing Christer and Dieter in case they are not on this list).
Christer was telling me about some of the interesting things they are doing, like an NTP (NTS) server using FPGA, cesium masters, etc. I have a single band GPS, so was trying to talk down all the cool toys he has. On the need for the cesium masters, Christer mentioned that the requirements for 5G were usually specified as "within 30ns". According to him, this is not a requirement as specced, but a vendor has this ability, so they are pushing this as "absolutely necessary". As Netnod's customers may want this as well, they have to be able to provide (some sort of?) PTP to the Telco. Christer agreed when I suggested that this is likely to be a "within network sync"; with respect to UTC, the network could drift. I have sinced looked around, requirements mentioned range from 1.5us to 65ns. It seems to depend on what services are offered, beam forming requires sub-us, location services sub-100ns. And few references mention if this is RTT or delay or ... Vendor Blog: https://blog.adva.com/en/time-to-rise-to-the-synchronization-challenges-of-5g Ericsson on Time in RAN: https://www.ericsson.com/en/blog/2019/8/what-you-need-to-know-about-timing-and-sync-in-5G-transport-networks -- Sanjeev Gupta +65 98551208 http://www.linkedin.com/in/ghane On Mon, Nov 18, 2019 at 6:54 AM Richard Laager via devel <devel@ntpsec.org> wrote: > On 11/17/19 6:44 AM, Sanjeev Gupta via devel wrote: > > Interesting discussion on the 5G requirements > > Any chance you can even briefly expand on this? In other words, what are > the 5G requirements that relate to NTP/NTS? > > -- > Richard > _______________________________________________ > devel mailing list > devel@ntpsec.org > http://lists.ntpsec.org/mailman/listinfo/devel >
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