N Slicing 11.4.1 Simulation System Model The aim of this section is to investigate how FH resources should be shared within a slice that is composed of MAC-PHY split to increase the performance of the system. In this section, we first introduce the system model for the Cloud-RAN system with multipath FH and then compare the solution with single-path (SP) FH transport and MPD under both orthogonal and non-orthogonal sharing of FH resources in the coexistence of eMBB and URLLC services. As discussed, in order to improve the reliability of FH transfer, a solution that applies multipath transmission with coding is used [18] (Figure 11.6). The simulation model con- sists of Cloud-RAN with a single CU and a single DU connected with multiple FH paths (n different paths), where each path i has a capacity Wi. Packets of size B bits arrive at the system with exponential inter-arrival periods with average 1/2 seconds (s). We assume that the FH links are identical. Each link is modeled as a single queue. We suppose that the service time of each queue follows an exponential distribution. The mean service time to transmit a packet of size B bits from CU to DU is 1/ = B/w S. The packets within each queue are served in a first-in first-out manner and the buffer length is assumed to be infi- nite. The focus of our model is on DL direction. However, all arguments are valid for uplink (UL). The system model parameters are shown in Table 11.3. To elaborate, we assume that eMBB and URLLC traffics are independent and character- ized by arrival rates and packet sizes as shown in Table 11.3. For each traffic, PDUs are tagged independently and with equal probability as intended for either UE. We compare three different FH resource allocation strategies for the eMBB and URLLC services: FH bandwidth orthogonal allocation: A fraction of the capacity of each path is exclusively given to each service. FH path orthogonal allocation: Each path is allocated exclusively to either one or the other service. Shared FH: All FH paths are shared betwee