Abstract.Recently, the application range of WBSN has been gradually expanding due to the advanced wireless telecommunication techniques and the activated ubiquitous environment. WBSN is a network environment in which various types of bio-signals created directly or indirectly in and out of the body are measured and processed for transmission to monitoring or mobile tools nearby. The MAC protocol proposed in this paper is in form of TDMA based technique in CSMA/CA environment. We apply the priorities of bio-signal data with each different characteristic and the minimum delayed transmission time for each data. We also consider the preferential transmission of urgent data to reduce the delay and the packet loss of them in typical mixed transmission of urgent data and other types of data.

The applications of wireless body sensor networks (WBSNs) have been increasing due to the advanced wireless telecommunication techniques and activated ubiquitous environment. The WBSN is a network environment in which various types of bio-signals generated directly or indirectly inside and outside the body are measured and processed for transmission to monitor the condition of the patient. We propose two types of adaptive MAC protocols to deal with emergency data separately in the system. The first proposed protocol reduces the delay by prioritizing emergency data over other general data by sending them first. The second proposed protocol applies the maximum delay requirement to emergency data to reduce the packet loss of general and emergency data.