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Sensors 2013, 13(1), 375-392; doi:10.3390/s130100375
Article

An On-Time Power-Aware Scheduling Scheme for Medical Sensor SoC-Based WBAN Systems

1,* , 1
 and 2
Received: 22 October 2012; in revised form: 19 December 2012 / Accepted: 20 December 2012 / Published: 27 December 2012
(This article belongs to the Section Physical Sensors)
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Abstract: The focus of many leading technologies in the field of medical sensor systems is on low power consumption and robust data transmission. For example, the implantable cardioverter-defibrillator (ICD), which is used to maintain the heart in a healthy state, requires a reliable wireless communication scheme with an extremely low duty-cycle, high bit rate, and energy-efficient media access protocols. Because such devices must be sustained for over 5 years without access to battery replacement, they must be designed to have extremely low power consumption in sleep mode. Here, an on-time, energy-efficient scheduling scheme is proposed that performs power adjustments to minimize the sleep-mode current. The novelty of this scheduler is that it increases the determinacy of power adjustment and the predictability of scheduling by employing non-pre-emptible dual priority scheduling. This predictable scheduling also guarantees the punctuality of important periodic tasks based on their serialization, by using their worst case execution time) and the power consumption optimization. The scheduler was embedded into a system on chip (SoC) developed to support the wireless body area network—a wakeup-radio and wakeup-timer for implantable medical devices. This scheduling system is validated by the experimental results of its performance when used with life-time extensions of ICD devices.
Keywords: on-time scheduling; power-aware; WBAN; wakeup-radio; wakeup-timer; sensor SoC; ICD; TMO on-time scheduling; power-aware; WBAN; wakeup-radio; wakeup-timer; sensor SoC; ICD; TMO
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Hwang, T.-H.; Kim, D.-S.; Kim, J.-G. An On-Time Power-Aware Scheduling Scheme for Medical Sensor SoC-Based WBAN Systems. Sensors 2013, 13, 375-392.

AMA Style

Hwang T-H, Kim D-S, Kim J-G. An On-Time Power-Aware Scheduling Scheme for Medical Sensor SoC-Based WBAN Systems. Sensors. 2013; 13(1):375-392.

Chicago/Turabian Style

Hwang, Tae-Ho; Kim, Dong-Sun; Kim, Jung-Guk. 2013. "An On-Time Power-Aware Scheduling Scheme for Medical Sensor SoC-Based WBAN Systems." Sensors 13, no. 1: 375-392.


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