NFV cRAN/vRAN require better time synchronization and distribution than with NTP. PTP can achieve clock accuracy in the sub-microsecond range.
This feature will be QA'ed by 16.2.2 timeframe. I will comment again after we have tested this feature
https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/16.2-beta/html-single/network_functions_virtualization_planning_and_configuration_guide/index#synchronize_your_systems_with_timemaster