# A Chaotic Compressive Sensing Based Data Transmission Method for Sensors within BBNs
## 2 Related Work  
This section briefly summarizes the medical and military applications of BBNs, resource consumption and security problems faced by sensor nodes in BBNs, and recent progress in the research of compressive sensing (CS) theory. In recent years, BBNs have already developed a number of applications for medical services and health care. The CodeBlue project launched by Harvard University attempted to achieve multi-hop transmission through routing nodes in WBANs [8]. A project called the Advanced Health and Disaster Aid Network [9], which applied WBANs in disaster rescues, could only allow a rather limited number of sensors taking part in the communication process due to restrictions of the bandwidth. [PERSON] et al. proposed a Wearable  
Figure 1: The network structure of a BBN. Each WBAN consists of a number of person nodes with sensors on or in their bodies. Three WBANs form a BBN and could interact with one another. Health Monitor System [10], in which a large-scale WBAN for health monitoring was deployed, but the performance of this system was impacted by energy consumption issues. There are also a number of research achievements in military applications of BBNs. At Walter Reed Army Medical Center (WRAMC), research on supplementary treatments involving cell phones as tools for diabetes treatment was conducted [11], and this could have a profound impact on the outcome of remedies for the elderly and patients with diabetes or other chronic diseases by introducing WBANs in remote health monitoring. [PERSON] et al. proposed a cost-efficient data transmission method to meet the demands of monitoring soldiers' vital signs [12]. This method reduced the energy consumption of WBANs worn by soldiers through the means of formulating and solving two optimization problems. Currently, WBANs and BBNs offer new possibilities for improving the performance of individuals and teams in terms of military operations. For instance, WBANs could play a fundamental role in preventing critical information from being stolen by enemies [13]. In this paper, in order to avoid threats generated by the single node problem, a group of sensors were deployed to collect important information about the circumstances and nearby new actions, and, at the team level, the information gathered by sensors could enable commanders to coordinate tasks with team members. [PERSON] et al. visualized a military health service platform and designed a model based on semantic edge [14]. [PERSON] et al. proposed a new military medical application that could assess the level of soldier fatigue and combat readiness, so as to protect staff in uniform [15]. Aiming at secure and efficient data transmission within BBNs, some solutions are raised. Several energy harvesting methods are proposed in [16; 17; 18; 19]. Energy harvesting means that nodes within BBNs collect or generate power from human bodies or other sources to supplement the batteries of sensors. The batteries may be charged by bioenergy or energies generated from body heat, vibration, or friction of movement, etc. However, such energy harvesting functions always add specific circuits to the hardware of BBN sensors, such as energy collectors or power management circuits. In this way, the costs of sensor nodes are increased, which may be detrimental to widespread deployment of BBNs. For energy saving, [PERSON] et al. proposed a novel medium access control (MAC) protocol with the function of reducing power consumption [20]. In [21; 22; 23], efficient routing protocols suitable for BBNs were designed, and several energy optimization and control algorithms were proposed in [24; 25]. To account for security, there have been several proposed schemes. [PERSON] et al. presented a solution for encryption and authentication processes in the link layer of BBNs and proposed a security suite based on IEEE 802.15.6 standard [26]. [PERSON] et al. offered an information security management system for WBANs to ensure data confidentiality and integrity [27].