In the real-time computing system, the primary feature is called the deadline, which is the maximum time which it must complete its execution within. Real-time system is a computing system that must react within precise time constraints to events in the environment. For such kind of cases, the real-time system can play a crucial role. Specially, applications like military operation, factory automation and so on, need a constraint time of a message transmission from source node to destination for guaranteeing validity of the message. Traditionally, the largest challenge of sensor network is the limited lifetime because of the battery-powered node.
#TIME SINK ENERGY MAC MAC#
Finally we present a discussion about the challenges of current wireless sensor real-time MAC protocols in the literature, and show the conclusion in the end.Ī wireless sensor network consists of a large number of small, inexpensive sensor nodes which are distributed over a geographical area for monitoring physical phenomena like temperature, noise, light intensity and speed etc. Then, a collection of recent wireless sensor real-time MAC protocols are surveyed, classified, and described emphasizing their advantages and disadvantages whenever possible. In this paper, we first introduce the specific requirement of wireless sensor real-time MAC protocol. To meet this requirement, recently several real-time medium access control protocols have been proposed for wireless sensor networks in the literature because waiting time to share medium on each node is one of main source for end-to-end delay. Among these requirements, real-time communication is one of the big research challenges in wireless sensor networks because most of query messages carry time information. However, the most of research efforts in wireless sensor network are focused on energy problem since the nodes are usually battery-powered. Keywords: Wireless Sensor Networks, Medium Access Control (MAC), Real-TimeĪs wireless sensor network becomes pervasive, new requirements have been continuously emerged.
Department of Informatics, Research Institute of Computer and Information Communication, Gyeongsang National University, Jinju, KoreaĮ-mail: Janurevised Februaccepted March 10, 2010
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