The following information obtained from UNAVCO's online DOI system:
(https://www.unavco.org/data/doi/search/search.html)

COCONet GPS Network - CN53-CN53_Pro_TCI2015 P.S.
Start: 15-Oct-2015
End: 18-Aug-2022
UNAVCO Community, 2015, COCONet GPS Network - CN53-CN53_Pro_TCI2015 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5P8498M