n the data obtained though link-level simulations. Other parameters including max (Tx power) and BSIUE Sensitivity depend on implementation and the deploy- ment scenario [14]. For extreme coverage scenario and for a basic mobile broadband service characterized by a downlink data rate of 2 Mbps and an uplink data rate of 60 kbps for stationary users, the tar- get maximum coupling loss is 140 dB. In this case and for most users, a downlink data rate of 384 kbps is acceptable. For a basic eMBB service characterized by a downlink data rate of 1 Mbps and an uplink data rate of 30 kbps for stationary users, the target maximum cou- pling loss is 143 dB. In this case, the downlink and uplink control channels must satisfy the performance requirements at this coupling loss. Handover Interruption Time: This metric refers to the shortest time interval during which a user terminal cannot exchange user-plane packets with any base station when traversing boundary of the two or more cells in a cellular network. The handover interruption time Ix Introduction and Background includes the time required to execute any radio access network procedure, RRC signaling protocol, or other message exchanges between the mobile station and the radio access net- work. This benchmark only applies to eMBB and URLLC usage scenarios where effectively a seamless handover interruption time (zero second) is required. 3.2 Test Environments In the course of development of technical standards, satisfaction of the service and system requirements by candidate technologies are often verified under certain channel propagation conditions, cell layouts, and the technical parameter set pertaining to the deployment sce- nario under consideration. A test environment is thereby an approximate representation of a practical deployment scenario with predefined channel propagation model, topology, and system configuration. Appropriate channel models are often developed and used in the eva- luations of the candidate technologies to allow realistic modeling of the propa