Multi-channel real-time communication in wireless sensor networks = 무선 센서네트워크에서의 다중 채널 실시간 통신

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There are diverse applications in Wireless Sensor Networks (WSN) which require real-time communication. Factory automation, process automation, intelligent traffic system, and real-time location tracing system are representative real-time WSN applications. Messages in such applications need to be communicated in given deadlines or periods. To implement these applications, real-time communication protocols and real-time message scheduling algorithms are inevitable. In order to support real-time communication, MAC (Medium Access Control) layer is relying on TDMA scheme which avoids packet collision and provides a deterministic packet transmission time. For TDMA scheme allocates a time slot to each node, and only the owners of a time slot are communicate at the time slot. Most research on TDMA are focusing on fairly distribution of time slots and minimization of the length of TDMA schedule. However, this dissertation proposes a real-time message scheduling algorithm which is allocating time slots to each message to meet the deadline constraints. This dissertation studies a real-time communication scheme based on IEEE 802.15.4 beacon enabled mode, first. IEEE 802.15.4 standard defines a superframe structure in beacon enabled mode. The superframe structure is specified by a beacon frame transmitted by a network controller called PAN (Personal Area Network) Coordinator. The duration of superframe is determined by BO (beacon order) and divided into an active region and an inactive region. The active region consists of CAP and CFP and is divided into 16 equally sized slots. IEEE 802.15.4 allows allocations of GTS (Guaranteed Time Slot) in CFP, and the owner of GTS is allowed to access the wireless channel. We extend our previous study on a real-time message scheduling for IEEE 802.15.4. The proposed off-line scheduling algorithm is evaluated extensively and the limitations of the standard are analyzed. In addition, a guaranteed time service is implemented in a wirele...
Advisors
Kim, Dae-Youngresearcher김대영researcher
Description
한국과학기술원 : 정보통신공학과,
Publisher
한국과학기술원
Issue Date
2010
Identifier
418836/325007  / 020055177
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 정보통신공학과, 2010.2, [ ix, 103 p. ]

Keywords

Multi-channel; Wireless Sensor Networks; Real-time; 실시간; 다중채널; 무선센서네트워크; WSN

URI
http://hdl.handle.net/10203/39863
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=418836&flag=dissertation
Appears in Collection
ICE-Theses_Ph.D.(박사논문)
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