Analysis of smart mobile medical solutions based on the Internet of Things
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Wireless local area network (WLAN) provides a flexible and effective extension for wired networks. Use PDA or computer through wireless network to collect vital signs data, query and input medical care data, doctor rounds, bedside care, call communication, care monitoring, drug delivery, patient identification code recognition, and voice multimedia based on WLAN Applications, etc., give full play to the effectiveness of the medical information system and highlight the technical advantages of digital hospitals.
According to the difference in application, mobile medical can be divided into the following typical scenarios (as shown in Table 1). It can be seen that, from core applications to value-added applications, the characteristics of business diversity are presented. Therefore, in the face of business-oriented medical information construction, the construction of a mobile data bearing platform that supports its business operations should be the focus of mobile medical solutions.
1. Intelligent mobile medical system architecture
According to the construction goal of the digital hospital information system, the architecture of the mobile medical system needs to be divided into terminal layer, IP network layer, and server cluster according to business needs. Among them, the construction of IP network needs to transition from the traditional wired network to the deployment of wired and wireless integrated intelligent mobile network based on wireless access. Terminal selection must fully consider and be compatible with the future development of mobile medical services, especially attention to details such as voice, barcode scanning, and positioning. Server clusters need to fully plan the north-south interface between medical business systems in determining the strategy of an independent network management platform.
As a basic bearer platform, the intelligence and integration of the mobile medical network has become the core component of the digital hospital information system.
1. End-to-end enhanced protection-solving wireless security issues
For the wired network of the medical unit, the internal and external network isolation construction is generally carried out. However, due to the limitations of the wireless technology itself, it is difficult to deploy two independent WLAN networks in the same area. Therefore, in the same area, the internal network and the external network can only share the same wireless network. Then, how to ensure the safety of medical applications in the internal network and the smooth progress of broadband access services on the external network has become one of the important concerns of mobile medical security.
Traditional wireless security solutions focus on strengthening the encryption/scrambling of spatial signal transmission, and prevent wireless networks from being affected by multiple network attacks through high-strength hardware encryption and certificate authentication mechanisms based on 802.11i/WAPI. But for mobile medical networks, it is more important to have end-to-end intelligent enhanced protection capabilities, which can prevent unauthorized personnel from using the hospital wireless network, prevent unauthorized terminals from using the hospital wireless network, and ensure the privacy and integrity of medical data , Intelligent perception of wireless intrusion risk.
· Wireless intrusion detection
For the control of illegal users, the traditional security method is to ensure the security of legitimate user data by defining a list of legitimate users and encrypting methods, but the methods are too single and passive. Wireless intrusion detection can break through this limitation and enhance the security of wireless networks:
· The wireless controller can designate the AP to work in two working modes: mode one, AP is responsible for monitoring the information of all channels on the air interface, but is not responsible for the forwarding of user packets; mode two, the AP periodically switches to other modes while forwarding data for users Channel monitoring information;
· The AP device is responsible for reporting monitored wireless devices and wireless devices with offensive behaviors to the wireless controller;
· The wireless controller identifies illegal devices based on the device information reported by the AP, and excludes legitimate devices;
· The wireless controller can control the AP to blacklist or attack illegal devices.
· Wireless terminal access control (W-EAD)
In the W-EAD scheme, the client supports unified authentication-wireless authentication and safety authentication are completed at one time, which is convenient for deployment and use. In addition to verifying user name, password and other information, users with legal identities are also checked whether they meet the requirements of the security policy, including whether virus software is installed, whether the virus database is upgraded, whether necessary system patches are installed, and so on. For users who meet both the identity check and the security check, W-EAD will assign corresponding network access permissions to them according to a predefined strategy, avoiding unauthorized network access and achieving the effect of hard isolation.
2. Wireless positioning based on RSSI fingerprints-to solve the management problems of personnel and equipment
At present, some hospitals use traditional RFID positioning systems, but these positioning systems all need to install corresponding independent card reading systems in the ward, and they are based on “point” positioning, which can only locate the object near a certain receiving point . The RSSI fingerprint wireless positioning based on WLAN not only makes use of the existing mobile IP network foundation, but also realizes the precise positioning of the “surface”. It is clear at a glance where the object is in the room and in the corridor.
RSSI fingerprint feature positioning technology is to collect the signal RSSI from the positioned object at multiple positions (P1, P2, P3…). Because the positioned object and each collection position are at different distances, these collection positions will receive different intensities. RSSI (RSSI1, RSSI2, RSSI3…), specific RSSI data (also called RSSI fingerprint) will reflect the characteristics of a specific physical location.
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As an important part of the mobile medical network, the wireless positioning system should meet the following functions:
· Realize all-round monitoring and management of people, places, times, and events for infectious patients, mental patients, and the elderly with dementia;
· Track the patient’s location, report abnormal conditions in real time, and keep track of the patient’s location to ensure safety;
· When a high-risk patient has an emergency, he can actively press the button to send a signal, and send out the distress signal at the first time, so that the ambulance staff can get the information in time;
· Provide real-time location tracking function for medical instruments and equipment to strengthen the comprehensive utilization and management of equipment. Various accurate information can also provide management reports such as instrument usage analysis and failure rate analysis;
· Intensify the management of dangerous or single-product drugs with particularly high value, and supervise the entire process of drugs from storage to consumption or scrapping, so as to ensure that the status of each drug is known at any time. It can effectively prevent the outflow and abuse of dangerous controlled drugs.
3. Intelligent traffic centralized forwarding-realize seamless roaming of mobile medical network
The importance of seamless roaming to hospitals is self-evident. Wireless terminal devices move quickly in wireless networks and uninterrupted services are the basic principles of mobile medical network construction. The “one-time authentication, fast mobile access” solution based on the “thin” AP centralized forwarding architecture can ensure seamless roaming of the second and third layers in the entire network, so that the medical staff can always connect at the highest rate during the mobile rounds. Network, thus ensuring business continuity.
As shown in Figure 3, when the chief doctor Zhang San worked in inpatient building A, he queried the information of HIS server A. When Zhang San moved to inpatient building B to work, it can be seen that he was still reading the information from the original HIS server. .
Since the doctor’s wireless terminal has already passed the security certification in inpatient building A, when inpatient building B is connected, there is no need to pass the security certification again, and it can be connected directly. During the movement, as long as there is a wireless network signal, the business will not be interrupted. The “one-time authentication, mobile access” seamless roaming solution makes wireless networks not only flexible, but also more reliable.
4. Integrated management platform-easy management of network equipment
Wired and wireless integration
Intelligent integrated mobile medical management not only organically integrates wired and wireless devices to form a whole through the integrated integrated management platform based on convergence, but also through the integration and docking of hospital business systems, it forms business transparency, smooth interfaces, and management The clear new mobile medical control center significantly reduces the difficulty of configuration and management, and improves the work efficiency of network administrators (as shown in Figure 4):
· Wired and wireless integration makes deployment easier and management easier;
· One authentication, multiple accesses, realizing fast roaming and switching of wireless terminals between different wards of different inpatient buildings;
· High security: combined with wireless EAD to achieve user identity security authentication and dynamic encryption;
· The POE power supply method solves the problem of inconvenient power supply and protects the investment at the same time;
· Provide value-added functions such as WIFI voice and perception positioning for wireless terminals and patients;
· Provide an open business platform, which can be used for secondary development and organic integration with third-party software.
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5. Summary of Smart Mobile Medical Network Technology
On the whole, the mobile medical network has gradually become an important component of the improvement of the informatization level of the medical industry. From the implementation of traditional wireless networks to the design and deployment of intelligent mobile networks, the relevant technical focus has quietly changed. The network architecture, protocol standards, user access security, engineering deployment, network architecture, platform management and many other aspects have made the best choice based on the needs of smart medical applications:
two, Concluding remarks
At present, smart mobile medical network solutions have been widely accepted and recognized by medical users. With the continuous development of wireless technology, relevant technical details will be more complete and integrated. The construction of the intelligent mobile medical network will provide doctors and nurses with real-time, on-site, and all-round digital hospital IT support, greatly improving work efficiency, effectively reducing labor intensity, and providing patients with more high-quality and reliable services. At the same time, with the improvement of efficiency and the optimization of service processes, the social and economic benefits of digital hospitals will be the best in smart mobile medicine.
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