摘要：Wireless Body Area Network(WBAN) is the most promising technology in e-health *** efficiency stands out as the paramount issue for *** this paper,an energy efficient MAC protocol named Quasi-Sleep-Preempt-Supported(QSPS) is *** protocol is mainly TDMA-based:nodes transmit packets in the allocated slots,while entering the Q-Sleep mode in other ***,for a node with emergency packet,it can broadcast a special designed Awakening Message to wake up the whole network and preempts the right to use the current slot to transmit that emergency packet,thus decreasing *** with relevant protocols,QS-PS can achieve high energy efficiency and decrease the delay of both normal packets and emergency packets.