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- 저자 : Henry Higgins (검색결과 4 건)
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On the implant communication and MAC protocols for WBAN
Ullah, Sana,Higgins, Henry,Shen, Bin,Kwak, Kyung Sup John Wiley Sons, Ltd. 2010 International Journal of Communication Systems Vol.23 No.8
<P>Recent advances in micro-electro-mechanical systems, wireless communication, low-power intelligent sensors, and semiconductor technologies have allowed the realization of a wireless body area network (WBAN). A WBAN provides unobtrusive health monitoring for a long period of time with real-time updates to the physician. It is widely used for ubiquitous health care, entertainment, and military applications. The implantable and wearable medical devices have several critical requirements such as power consumption, data rate, size, and low-power medium access control (MAC) protocols. This article consists of two parts: body implant communication, which is concerned with the communication to and from a human body using radio frequency (RF) technology, and WBAN MAC protocols, which presents several low-power MAC protocols for a WBAN with useful guidelines including a case study of IEEE 802.15.4, PB-TDMA, and SMAC protocols. In body implant communication, the in-body RF performance is affected considerably by the implant's depth and different polarization combinations inside the human body as well as by the muscle and fat. We observe best performance at a depth of 3 to 5 cm and not close to the human skin. Furthermore, the study of low-power MAC protocols highlights the most important aspects of developing a novel low-power and reliable MAC protocol for a WBAN. Copyright © 2010 John Wiley & Sons, Ltd.</P> <B>Graphic Abstract</B> <P>This paper presents a comprehensive study on the performance of RF communication to/from a human body and low-power MAC protocols for a WBAN including a case study of IEEE 802.15.4, PB-TDMA, and SMAC protocols. It can be seen that in-body RF performance is considerably affected by the implant's depth and different polarization combinations. In addition, the study of low-power MAC protocols highlights the most important aspects of developing a novel and reliable MAC protocol for a WBAN. Copyright © 2010 John Wiley & Sons, Ltd. <img src='wiley_img_2010/10745351-2010-23-8-DAC1100-gra001.gif' alt='wiley_img_2010/10745351-2010-23-8-DAC1100-gra001'> </P>
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On PHY and MAC Performance in Body Sensor Networks
Ullah, Sana,Higgins, Henry,Islam, S. M. Riazul,Khan, Pervez,Kwak, Kyung Sup Hindawi Publishing Corporation 2009 Eurasip Journal on Wireless Communications and Net Vol.2009 No.-
<P>This paper presents an empirical investigation on the performance of body implant communication using radio frequency (RF) technology. In body implant communication, the electrical properties of the body influence the signal propagation in several ways. We use a Perspex body model (30 cm diameter, 80 cm height and 0.5 cm thickness) filled with a liquid that mimics the electrical properties of the basic body tissues. This model is used to observe the effects of body tissue on the RF communication. We observe best performance at 3cm depth inside the liquid. We further present a simulation study of several low-power MAC protocols for an on-body sensor network and discuss the derived results. Also, the traditional preamble-based TMDA protocol is extended towards a beacon-based TDMA protocol in order to avoid preamble collision and to ensure low-power communication.</P>
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Sana Ullah,Henry Higgins,곽경섭 한국통신학회 2008 정보와 통신 Vol.25 No.2
지능형 센서, 마이크로전자공학 및 집적회로, SoC(system-on-chip) 설계와 저전력 무선통신의 급속한 발달로 소형 지능형 센서노드의 개발을 촉진하여 왔다. 이러한 센서 노드는 인체센서네트워크(Body Sensor Network;BSN)의 개발에 초석이 되며, 향후 이 분야의 급속한 발전을 기대하게 된다. 초 저전력 RF 기술의 발전은 침투식 및 비침투식 장치들이 원격 단말과 데이터 전송을 가능케 하며, 환자를 장기간 모니터링하여 의료 전문가에게 실시간으로 피드백함으로써 건강관리 시스템의 일대 혁신을 일으키고 있다. 본 기고에서는 이식형 의료 장치들간의 무선통신 방법과 BSN 분야에서의 최근 기술적 발전동향에 주안점을 두어, 인체 내장형 및 인체 부착형 통신 네트워크 구조를 파악한 후, 이들 분야에서 미해결쟁점과 난제에 관하여 분석하였다.
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Ullah, Sana,Saleem, Shahnaz,Higgins, Henry,Ullah, Niamat,Zhong, Yingji,Kwak, Kyung Sup Hindawi Publishing Corporation 2010 Eurasip Journal on Wireless Communications and Net Vol.2010 No.-
<P>The performance of the implant inside a human body with polarisation, distance, and different power settings at the base-station is presented. In addition, the unslotted CSMA/CA protocol is studied for a heterogeneous WBAN.</P>
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