## 2 Related Work  
The rapid development of wireless communication protocols has enabled the development of wireless medical devices [5; 6]. Wireless capability refers to the transmission of biomedical information obtained from sensors or embedded systems through a wireless communication channel to a remote medical station or mobile device. In the literature, many efforts have been made to advance this capability. For example, [PERSON] _et al._[7] have developed a wireless technique to transmit information between biometric sensors and a monitoring center to increase the free space surrounding the patient. Additionally, the system, which is based on ZigBee technology, aims to improve the management of hospital services. The monitoring terminal can detect the patient's body temperature, heart rate and other physiological information in real time and transmit this information to the control center. [PERSON] _et al._[8] present a new concept for wireless electrocardiogram (ECG) monitoring, specially designed for arrhythmia diagnostics, based on a smart electrode with wireless transmission capability. The system acts as a continuous event recorder that can be used to monitor patients with arrhythmia. [PERSON] _et al._[9] introduce a multi-tier telemedicine system to perform real-time analysis of sensor data. Several intelligent devices are integrated into a wireless body area network (WBAN) to create a system for health monitoring. The system performs real-time analysis of sensor data. In addition, it uses cloud storage so that data can be retrieved at any time anywhere. \begin{table}
\begin{tabular}{p{113.8 pt} p{56.9 pt} p{56.9 pt} p{56.9 pt} p{56.9 pt} p{56.9 pt}} \hline
**Author** & **Application** & **Variables** & **Communication** & **Sensors** & **Monitors** & **Benefits** \\ \hline [PERSON] _et al._[10] & Patient monitoring in a smart home & Cardiac activity & ZigBee & ECG & CPU & Communication with home server via ZigBee; incoming data stored for future reference \\ \hline [PERSON] _et al._[3], patient monitoring system & Ambulatory patient patient & Vital signs, position of patient & WiFi accelerometer & GPS, ECG, accelerometer & PDA, CPU geo-positioning \\ \hline [PERSON] _et al._[11], 2010 & Monitoring system for the elderly & Acceleration and tilt angle & ZigBee, Bluetooth & Accelerometers, CPU gyroscope & Mobility of nodes \\ \hline [PERSON] _et al._[12], condition monitoring system & Cardiac activity, volume & ZigBee & Conductance catheter & FPGA, CPU & Management of multiple signals \\ \hline [PERSON] _et al._[13], disease monitoring system & Gair, posture, leg and hand & ZigBee & Accelerometer, gyroscope, microphone & PDA & Focused on one disease \\ \hline [PERSON] _et al._[14], 2012 & General patient monitoring system & Cardiac activity, respiration, muscle activity & ZigBee, Bluetooth, WiFi & EMG, EEG, EKG & PDA, CPU medical server through Internet \\ \hline Our proposal, 2014 & General patient monitoring system & Cardiac activity, body temperature & WiFi & ECG, Body temperature & Smartphone, CPU & Communication with nurse server and smartphones through Internet \\ \hline \end{tabular}
\end{table} 
Table 1: Research on biomedical wireless monitoring systems. Table 1 lists some of the works that have been performed on wireless patient monitoring systems. Each research project attempts to solve a specific problem and uses different technologies, such as different types of sensors, monitors, and wireless communication technology. Remote patient monitoring faces several obstacles. Older patients might be unfamiliar with the technology, and people of all ages might still have to be persuaded to use it. A wearable device could save lives. For example, smart watches can be used to manage chronic problems and optimize fitness programs. Wearable devices can provide output and connect to the Internet in various ways. Some devices enable wearers to monitor their own data using a mobile phone and a special website.