Abstract
Wireless Body Area Network(WBAN) has made progress in technology and is gaining momentum in healthcare field. As the number of WBAN increases, WBANs coexistence is becoming prevalent which brings a negative effect on communication quality. In healthcare field, data reliability and power efficiency are attracting more attention. Many power control mechanisms based on TDMA have been provided to improve above performance. These mechanisms often make predictions of channel state according to the received information and adjust transmit power according to the predictions. TDMA is used as the access scheme in these mechanisms for its advantage in power efficiency. However, in the scenario with WBANs coexistence, the time interval of prediction gets too long because of waiting time in TDMA. The information which we use to make prediction is obtained from previous superframe and it is usually out of date after a long wait for next frame. Besides, accuracy of prediction also deteriorates for the channel fluctuations which is caused by the body movements. To maintain data reliability, we propose a new power control mechanism based on hybrid access schemes(HAPC). In HAPC, channel state plays an important role in power adjustment. Different access schemes are taken in sensors on the basis of channel state. Channel prediction is only conducted when channel is stable. Simulation results show that this mechanism achieves better performance in reliability without sacrificing much energy loss.
Published Version
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