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Performance of simple and Smart PHY/MAC mechanisms for Body Area Networks

Measuring the living condition and health status of users using small sensing devices and collecting the data of each user over wireless networks is expected to be a new trend in healthcare. Body Area Network (BAN) is an emerging area of personal data communications that will facilitate the capture of data and its collection. Although the IEEE 802.15.6 standard for wireless body area networks was created for this purpose, it is very complex and is unsuitable for ultra low power sensors. A new BAN specification, under the Technical Committee (TC) on SmartBAN, is now being considered in the European Telecommunications Standards Institute (ETSI) targeting ultra low power devices. Some of the technical requirements of the new Smart BAN system includes ultra-low power consumption, coexistence with other wireless systems, a timely access mechanism and optimum control of quality of service (QoS) for emergency signals. A simple and energy efficient MAC/PHY system has been proposed by the authors as part of the ETSI TC Smart BAN specifications. In this paper, we introduce and evaluate our proposed Smart BAN system which is based on two channels, a control channel and a data channel. The control channel is used for announcements from which both nodes and neighboring hubs are able to gather information for use in co-existence algorithms as well as for initial connection setup. Our proposed system uses simple time division multiple access (TDMA) in the data channel so that the power consumption of nodes is kept low. A shared access mechanism has also been proposed to reduce the latency of emergency signals. We evaluate the access delay and power consumption of our system in this paper, and show that the proposed shared access mechanism reduces the latency of emergency signals.