# Sensors Energy Optimization for Renewable Energy-Based WBANs on Sporadic Elder Movements
## 3 Power Consumption Aspect in WBAN
#### 3.2.1 Sleep Mode  
Listening to idles is an essential factor in wasting energy, as nodes need to remain alive to receive possible results. If there is no information from the other transmitters, since a sleep node [35] is not working, no data can be obtained and no information broadcast. A successful Sleep Mode mechanism can bring resilience to energy conservation into the right balance. The core ideas for Body MAC's [36] sleep mode are founded by the findings that specific nodes in WBAN are very duty-free and The receiving of the beacons in each frame and being involved on both the up and downlink is a waste of energy. The BodyMAC sleep mode attempts to disable the node radio as much as possible during beacon, uplink, and download. The sleep parameters in terms of frame number are the frame number and sleep time. Following the request from Sleep Mode, the node gateway sends an ACK to show that the demand for Sleep Mode was successfully received. The gateway determines the mode of sleep and sleeps criteria based on evidence or experience. This reveals that the Global Telecommunication System (GTS) data packet transfer loss means sleep mode termination. The re-sync follows the re-sync process. The supporting of time crucial incident monitoring is one of the specifications of the WBAN MAC [37] specification. The Sleep Mode must help it because time-critical events will still occur. If the node in the current frame is assigned to GTS [38], the event message packet may be sent to CAP [39] or GTS, in the nearest CAP time the incident report will be sent by CSMA/CA to the gateway [40]. When an ACK is received which indicates that an event report packet has been received successfully through the gateway, the node is reentered in sleep mode. GTS is another way to submit a packet of incident reports. WBASN connectivity architecture, the connectivity architecture of the WBASN monitoring system, is depicted in Table 3 and Figure 2. As the Figure 2 shows, the sensor attached human body. Electroencephalograms (EEGs) [41], electrocardiograms (ECGs), electromyography's (EMGs), and blood pressure monitors are all examples of sensors. A dish or base station was used to transmit the sensor data to the central server (BS). A medical doctor, a medical clinic, or a medical library may then use this information to acquire additional information and diagnose a disease. \begin{table}
\begin{tabular}{c c} \hline \hline
**Wearable Sensors** & **Implatable Sensors** \\ \hline EEG & Retina Implants \\ Glucose Sensor & Deep brain stimulator \\ EMG & Electronic Pill \\ ECG & Pace maker \\ Blood Presure & Electronic Pill for drug delivery \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Sensor in WBAN. Figure 3 represents the WBASN communication architecture. The hybrid system means combination of more modes of generation of electricity together, usually by means of renewable energy like that solar photovoltaic and wind power generators. Hybrid renewable systems offer a greater level of power security all the way through the combine of production, and over and over again will include a storage power system (power batteries, fuel cells) or fossil fueled power generator to ensure supply security and reliability. Hybrid power systems consist of the integration of the generations of different natures for the use of power of an electrical nature. These hybrid power grids may be independent of a large area based and centralized nature based electric utility grid and incorporate power generation sources which have a different nature. These may have small size to large size islanded grids having size in the form of megawatts. Small size hybrid grids may include individual household power supply systems rated at one kilowatt which has the rooftop integrated solar PV plants. The hybrid power networks are capable of delivering currents of alternating nature which has a frequency of fixed nature. These have incorporated recent emerging technology which can be used to supply electric power in locations which are very remote.