# OpenCare5G: O-RAN in Private Network for Digital Health Applications
## 3 Proposed Solution
### OpenCare5G Project Architecture  
The first step was to define a new approach using the Private Health Network Architecture with the trends in the design of a Gigabit-based packet data network, sharing the 5G Internet with the Customer Premises Equipment (CPE) in the local network via Wi-Fi 6 (802.11 ax) that imposes new requirements to build, test, operate and update it. The 5G xHaui O-RAN Operations, Administration, and Maintenance (OAM) Private Network Project Architecture via vRAN was divided into three segments of logical \"nodes\", also called functional blocks, that are areas/connection points for the functions. Then an Infrastructure Layer with the Network Fronthaul (gNB-RU) of the Radio unit, Midhaul (gNB-DU) of the Distribution Unit, and Backhaul (gNB-CU) of the virtual centralized unit towards the 5 GCN in the Itai datacenter was provided, forming the access network by virtualized radio (vRAN) of the End-to-End (E2E) design [22]. We have requested of Anatel, the Brazilian telecommunications regulator, the use of the radio frequency spectrum by telecommunications systems associated with the Private Limited Service (PLS) for allocating the 5G band of restricted interest for health [1; 3; 23]. This is meant for exploration nationwide, in the private regime with a frequency spectrum in band n77 5G 3700-3800 MHz, 100 MHz bandwidth with vRAN performing baseband functions as software [3; 24]. The 5G xHaui O-RAN OAM vRAN Private Network Project Architecture will provide connectivity and interoperability through radios, hardware, software, containers, virtual machines, and cloud-native open interfaces from different manufacturers with an approach of using less hardware and achieving greater economy. The ability to increase flexibility and easily scale up and down workloads should scale to meet changing network demands for mobile bandwidth, ultra-reliable secure communication and ultra-low data latency as shown in Figure 2[14; 25; 26; 27]. Figure 2: 5G xHaul network architecture of the Inovac OpenCare5G Project with simplified O-RAN OAM in the infrastructure layer. Based on [21]. Figure 3 shows the 5G xHaul network architecture of the Inovac OpenCare5G Project with Complete O-RAN OAM via vRAN in the infrastructure, mobile and services layers, showing the subnets connected to the User Equipment (UE)/Exam Room, UE/Control Room Doctor, Radio Units/Subnetwork, 5G CPE (Device), Fronthaul Transport Network, Subnetwork/Sync, DU/vDU, Midhaul 1 Transport Network, Midhaul 2 Transport Network, CU/vCU, Backhaul Transport Network, 5 GCN in Cloud and Network Slice for 5G NR. Figures 2 and 3 show the following components:  
1. The Radio Subnetwork of the gNB-RU (Fronthaul) which has two radio units (RUs) formed by an active internal antenna (Advanced Antenna System - AAS RU) coupled to the Remote Radio Unit (RRU) for the 5G NR Sub-6 GHz type 4T4R. The physical interface for glass fiber optics to control coverage and mitigate interference with \"digital beamforming\" on demand with internal connectivity is able to increase the transfer rate for speeds above 2 Gbps up to 10 Gbps for the two distinct environments (Exam and Control Room) at HCFMUSP with the following specifications [29; 30]: * Type Airvelocity 2700 RU from Airspan company for 5G RAN;
* 2 AAS-RU units with 4 4T4R AAS active antennas, 3.7-3.8 GHz range, n77 band, FM, DC;
* 5G Sub-6 radiates radio frequency energy;
* F2 Fronthaul interface between the RU and the DU for 10 GbE;
* vRAN Split 7.2x; the RU/DU must conform to functional split RAN 7.2a, Duplex Operation Mode and 100 MHz Bandwidth [29];
2. The Indoor 5G CPE in the subnetwork of the gNB-RU (Fronthaul) with two CPEs provides connectivity, speed and latency similar to optical fiber connecting electronic devices via 5G; it distributes signal by Wi-Fi 6 (802.11 ax) to the doctors' examination  
Figure 3: Architecture of the 5G xHaul network of the Inovac OpenCare5G with O-RAN OAM, complete vRAN in the infrastructure, mobile and services layers. Based on [14; 26; 27; 28].