## 7 Discussion and Open Research Issues
If one of the vital sign parameters gets lost, arrives with delay or in a different time slot, a critical condition could be ignored. So, these factors are needed to evaluate a WBSNs through critical time parameters [60]. This research has presented information to develop an adaptive system optimization. This is important because the energy consumption could be altered by multiple factors when the monitoring is conducted in a patient, e.g., it is not the same to monitor three patients as eight, two or five vital signs or to carry out the WBSN monitoring in a rural area as in an urban area with 4G cell phone network. It is necessary to take into account that each patient's condition represents different needs and priorities to evaluate, in other words, there is a big difference of patients being monitored in an emergency situation from that of inside hospitals or in their homes. By developing a system which is sensitive to changes of variables such as polling interval, traffic generated by sensors, priorities for monitoring or energy remaining in the system, we will make a significant contribution towards improving performance to maximize the WBSN lifetime. The aim of the development for this proposal is based on contributing in the area of telemedicine that seeks to provide better care to patients in each of the above scenarios allowing a more reliable doctor-patient relationship. Having a WBSN with high performance and in real-time, we can improve the disease control practices resulting in the improvement of patient health status. In terms of network optimization for the transmission of data and video over limited bandwidths, that is common for m-health scenarios, it is necessary to reduce the required resources from the network. A common approach to minimize the physical data channels of the network is the joint-transmission of different elementary streams like: video, audio, physiological signals, personal data, _etc._ The joint-transmission of the streams can be achieved via multiplexing, that is common for an audio/video streaming in a media context. Recently, data hiding techniques have been implemented for media context, like those based on different block sizes taking the rate-distortion into account to achieve good performance in the audio-video synchronization, one stream of information (audio) embedded into the video signal [61,62]. The advantages envisioned for this technique over multiplexing, resides in the protection/privacy of the medical data and the natural synchronization achieved between the elementary streams and the video. With data hiding, the transmission of medical data (physiological signals, personal data) will be embedded into the video stream, so only one communication channel is needed, moreover the privacy and accurate synchronization is established. Whenever the frequency of the physiological signals is greater than the frequency encoded video sequence capacity, data compression can be necessary to overcome the visualized data hiding synchronization scheme. Therefore, high frequency compressed signals could be hidden into the video signal with accurate synchronization and with less quality degradation of video caused by the data hiding scheme.