How can a gNB survive from internal synchronization issue or interference in case of TDD?

RAN
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1

Hi Experts.

After GPS fault and PTP server link failure…

How can a gNB survive from internal synchronization issue or interference in case of TDD?

Is there any internal clock or oscillator exit inside gNB which can provide holdover time?

Kindly suggest.

2

There is always internal unit with which hold over time exist.

Below are few steps which I came across.

  • Gps antenna fail :- if satellite is not tracking or not visible then Gps antenna fail alarm is generated
  • GPS locking fail :- if gps antenna fail alarm is on site more than 1hr the. Gps locking alarm is generated
  • If antenna fail alarm is on site the site is sync through internal clock (OCXO) .
  • Internal clock on site will go on maximum 24hr
  • If gps hold over for 24 he alarm is generated on site it means only TDD is down not fdd
  • If gps function fail alarm is at site it means OCXO is fault (most probably)in this case both fdd and TDD will not working