# Smart Healthcare Applications over 5G Networks: A Systematic Review
## 4 Conclusions
Additionally, it could be seen that the body sensors and wearable devices used in the different smart healthcare systems use short- and long-range communication technologies to share patients' medical information. As was observed in Figure 12, 40.91% (\(n=18\)) of smart healthcare systems used Bluetooth and Wifi as communication technologies. However, Bluetooth is also employed in other systems, along with short-range technologies such as NFC and Zigbee. In other words, it is widely used in the vast majority of the works presented. This is because Bluetooth is compatible with all types of body sensors and wearable devices, such as oximeters, glucose monitors, and smartwatches. This makes it adaptable to most of the medical applications presented. Still, it was observed that the cellular network plays an important role in the transmission and communication of intelligent health systems, especially in those that generate large amounts of medical data, such as in the case of telesurgery and ambulances, where reliable and uninterrupted communication is required for direct communication during the transmission of medical information. Regarding the technical requirements, it was observed that the presented smart health systems require improved mobile broadband, and highly reliable and low latency communications. However, as shown in Table 4, most of the authors focused mainly on system latency, since this parameter is of vital importance for all medical applications (monitoring and remote care), but mainly for telesurgery scenarios, where the patient's life is at risk. Uninterrupted communication is necessary to safeguard their safety. A delay or disconnection in this type of intervention could be fatal. Along with latency, parameters such as data rate, bandwidth, and uplink and downlink speed are fundamental to smart healthcare systems, as they allow the transmission of medical data in a fast, accurate, and reliable way. However, not all the works identified detail the technical specifications of their systems. When analyzing the security systems or protocols employed by smart healthcare systems, it was observed that most studies do not address this issue. This feature should be considered by researchers or developers, as the privacy protection of patient information and medical systems must be safeguarded. In addition, an information leak or a cyber attack could put human lives at risk. The reviews and states of the art studies presented above mostly do not indicate the technical requirements of the systems. They do mention security for cyber protection, but most do not present any mechanism or architecture. However, in our work, we have addressed the technologies, technical requirements, and security that are part of a smart healthcare system with 5G, intending to provide the reader with a broader and more complete picture. Today, smart healthcare is key to safeguarding people's lives, especially in the current situation of the healthcare system, which has been violated worldwide by the presence of the COVID-19 pandemic. This is supported by the study published by WHO on 31 August 2021 [67], which presents a compendium of technologies for the fight against COVID-19 in order to support countries in the improvement of health services. The need to migrate to intelligent health systems to safeguard patients' health and improve access to medical services is notable. Future work will include the development of a SWOT analysis to provide a more complete perspective on existing technological supports. In addition, based on the correlation analysis, it is possible to make proposals for the development of technological supports in lines of research that are not currently being studied. Each of the empty spaces within the analysis represents an opportunity to propose alternatives and to be pioneers in this area. Conceptualization, A.M.P.-O., P.A.C.-A., L.F.G.-V. and E.J.C.-G.; methodology, L.F.G.-V. and J.O.O.-O. ; investigation, A.M.P.-O. and P.A.C.-A. ; data curation, L.F.G.-V.; writing--original draft reparation, A.M.P.-O.