The Research Of Energy-efficient Access Mechanism Based On IEEE802.15.6in Wireless Body Area Network

As the sensor technology and communication technology is in rapid development,wireless sensor networks has been closely combined with the medical field, thus theWireless Body Area Network (WBAN) taking human body as its main application carrieris getting more and more attention, and its primary application fields are medical field andnon-medical field. Although the Wireless Body Area Network is facing many similarchallenges with other traditional wireless networks, it has a higher requirement on thedesign.In this paper, began with the research background, current status, characteristics andchallenges in technology of the Wireless Body Area Network. Firstly, we introduced thebasic structure and characteristics of WBAN and the main function of the standard ofIEEE802.15.6. Secondly, based on the analysis of the network standard ofIEEE802.15.6,which is put forward specially for WBAN, network operating mode, theMAC frame structure and channel access mechanism have been introduced. However, inthe application of WBAN, how to reduce the energy consumption of the device is thefocus of current work. Since sensor nodes are usually powered by batteries for its wirelessportable application requirements, besides, the replacement of batteries in implantablenodes is hard to implement, thus, node energy consumption is very limited and efficientenergy utilization is an important part of the MAC protocol design. In order to achieveultra-low power consumption of WBAN, an new energy efficient MAC protocol based onradio wake-up has been proposed. It can realize TDMA strategy, whose communicationoverhead is very small. Because when there is no data being sent, node is in a dormantstate, which can avoid idle listening and reduce the network energy consumption and delay.In the design, the node can be woken up by wake-up radio signals sent by hub if it hasdata-send task, and turn into sleep mode after the task finished by adding a very smallhardware overhead radio wake-up circuit to it.Compared to X-MAC and S-MAC protocol, the MAC protocol proposed in this paper has advantages in power consumption and delay in analysis and simulation results. Last, asummarize of this paper and a future development prospect have been given out.