Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Evaluation of a TDMA-based energy efficient MAC protocol for multiple capsule networks | Lin et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 54 http content 2011 1 54 o EURASIP Journal on Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Evaluation of a TDMA-based energy efficient MAC protocol for multiple capsule networks Lin Lin1 2 Kai-Juan Wong2 Arun Kumar2 Zongqing Lu2 Su-Lim Tan2 and Soo Jay Phee1 Abstract Wireless capsule endoscopy is a new kind of medical device which monitors the gastrointestinal tract of the human body. It can be envisaged that in the future more than one capsule could be ingested by the patient and they operate collaboratively in the gastrointestinal GI tract to perform certain diagnostic and therapeutic tasks. These mobile capsules and the coordinator node which is attached to the abdomen of the patient form a wireless network. The capsule devices are typically powered by batteries therefore energy efficient medium access control MAC protocols for multiple capsule networks are necessary. This article proposes a novel energy efficient MAC protocol for multiple capsule networks based on time division multiple access TDMA . An asymmetric up down link network architecture is introduced. A novel TDMA slot assignment scheme is proposed and simulation results using Qualnet show that the proposed MAC protocol achieves lower energy consumption than B-MAC and star topology TDMA. Keywords multiple capsule networks MAC protocol TDMA asymmetric topology 1. Introduction Wireless capsule endoscopy WCE is a new kind of medical device which is ingested by the patient for the purpose of inspecting the gastrointestinal GI tract. Currently the commercial WCE is mainly composed of a camera a transceiver and two button batteries 1 . The camera captures images of the GI tract and sends them to an external data recorder wirelessly. It is envisaged that in the future WCE will be made more versatile by providing many advanced functionalities such as active locomotion
