KIPS Transactions on Computer and Communication Systems (정보처리학회논문지:컴퓨터 및 통신 시스템)

Korea Information Processing Society (한국정보처리학회)
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Transmission Latency-Aware MAC Protocol Design for Intra-Body Communications

인체 채널에서 전자기파 전송 지연 특성을 고려한 다중 매체 제어 프로토콜 설계

  • Received : 2019.07.04
  • Accepted : 2019.07.15
  • Published : 2019.08.31
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Abstract

Intra-Body Communication (IBC) is a communication method using the human body as a communication medium. The fact that our human body consists of water and electrolyte allow such communication method could work and have strength in low-power. However, because the IBC directly affects to human body by using it as a medium, there was a lack of research in communication protocols of each communication layer. In this paper, we suggests MAC parameters which affects the performance of communication in human body channel, and propose new MAC protocol. Our results shows that our MAC is suitable for supporting high data rate applications with comparable radio duty cycle performance.

인체 통신은 인체를 매질로 통신하는 기술로, BAN (Body-Area Network) 환경에서, 무선 통신에 비해 신호 감쇠 측면에서 큰 이점이 있어 배터리로 동작하는 웨어러블 기기 간 통신 시 저전력 통신을 지원할 수 있다. 하지만, 인체 통신은 그 이점에 비해 안전성 등의 문제가 있어 채널 특성에 대한 연구가 미비하였다. 이에 본 논문은 인체 채널 특성에 있어 통신 성능에 영향을 주는 MAC 파라미터를 제시하고, 이를 이용한 새로운 인체 통신 용 MAC 프로토콜을 제안하고, 또한, 각기 다른 가드 인터벌을 설정하여 성능을 분석하였다. 결과로, IEEE 802.15.6 표준 기반 Slotted aloha 프로토콜에 비해 약 300kbps의 Goodput 이득을 가졌으며, Duty cycle 또한 약 7.07%로, 표준의 최소 duty cycle이 약 5%이지만, Goodput을 고려했을 때, 인정할 수 있는 성능이라 볼 수 있다.

Keywords

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Fig. 1. Two Types of Coupling Methods for Intra-Body Communications

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Fig. 2. Proposed Superframe Architecture

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Fig. 3. Physical Layer Frame Format

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Fig. 4. Packet Structure for the Scheduling Phase

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Fig. 5. Packet Format for the Join Phase(Left) and Data(Right)

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Fig. 6. MAC Header Frame Format

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Fig. 7. State Diagram for the Sink Node

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Fig. 8. State Diagram for the Client Nodes

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Fig. 9. Goodput for IEEE 802.15.6 Slotted Aloha with Different Data Requests

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Fig. 10. Goodput for Phang et al.[12] with Different Data Requests

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Fig. 11. Goodput for Proposed Scheme with Different Data Requests

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Fig. 12. Duty Cycle Results for IEEE 802.15.6 Slotted Aloha

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Fig. 13. Duty Cycle Results for Phang et al.[12]

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Fig. 14. Duty Cycle Results for the Proposed Scheme

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Fig. 15. Latency Result of IEEE 802.15.6 Slotted Aloha

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Fig. 16. Transmission Latency for Phang et al.[12]

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Fig. 17. Transmission Latency for the Proposed Scheme

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Fig. 18. Maximum Achieved Goodput for Varying Guard Intervals

Table 1. Requirements of MAC Protocol Design for Intra-Body Communications

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Table 2. Parameters Used for the IEEE 802.15.6 Slotted Aloha, Phang et al. [12], and the Proposed Scheme. All Parameters Assume a 1Mbps Channel Throughput

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Table 3. Contention Probability by Each User Priority(UP)

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