Embodiments of a Next Generation Node-B (gNB), User Equipment (UE) and methods of communication are generally described herein. A Master gNB (MgNB) may be arranged to operate in accordance with a New Radio (NR)-NR Dual Connectivity (NR-NR DC) arrangement with a Secondary gNB (SgNB). If the UE does not support per-frequency (per-FR) measurement gaps, the MgNB may configure a per-UE measurement gap for the UE for measurement of signals in a first frequency range and in a second frequency range. If the UE supports the per-FR measurement gaps, the MgNB may configure a first measurement gap in the first frequency range, and the SgNB may configure a second measurement gap in the second frequency range.