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An energy efficient MAC protocol for multi-hop swallowable body sensor networks.

Lin Lin1, Chengfeng Yang2, Kai Juan Wong3

  • 1School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200072, China. fxlinlin@shu.edu.cn.

Sensors (Basel, Switzerland)
|October 21, 2014
PubMed
Summary

This study introduces an energy-efficient Medium Access Control (MAC) protocol for swallowable body sensor networks (BSNs). The new protocol significantly reduces energy consumption compared to IEEE 802.15.6, extending device lifespan.

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Area of Science:

  • Biomedical Engineering
  • Wireless Communication Systems
  • Sensor Networks

Background:

  • Swallowable body sensor networks (BSNs) face significant energy constraints due to in-body sensor limitations and difficult battery replacement.
  • The Medium Access Control (MAC) protocol is critical for managing energy consumption in BSNs.
  • Existing protocols may not be optimized for the unique challenges of in-body communication.

Purpose of the Study:

  • To design and evaluate an energy-efficient MAC protocol specifically for swallowable BSNs.
  • To demonstrate the advantages of multi-hop communication over single-hop for in-body BSNs.
  • To reduce the energy burden on individual sensor nodes.

Main Methods:

  • Analysis of multi-hop versus single-hop communication energy efficiency within the human body.
  • Proposal of a centrally controlled time-slotting schedule managed by an external coordinator.
  • Implementation of a protocol where the coordinator calculates routing, slot assignment, and transmission power based on a path-loss map.
  • Comparison of the proposed protocol's energy consumption against the IEEE 802.15.6 standard.

Main Results:

  • Multi-hop communication is proven to be more energy-efficient than single-hop for swallowable BSNs under low circuitry power conditions.
  • The proposed centrally controlled MAC protocol shifts computational workload from sensors to the coordinator.
  • Empirical results indicate the new protocol is more energy-efficient than IEEE 802.15.6 in swallowable BSN scenarios.

Conclusions:

  • The developed MAC protocol offers a significant improvement in energy efficiency for swallowable BSNs.
  • Centralized control and multi-hop communication are key strategies for optimizing energy management in ingestible sensors.
  • This approach enhances the viability of long-term in-body monitoring using BSNs.