무선 센서 네트워크에서 블록응답을 이용한 에너지 효과적인 맥 프로토콜

Abstract

The reduction of power consumption and network’s life expansion are crucial for a wireless sensor network (WSN). This is typically performed by introducing low duty cycle in a sensor node. A special challenge in WSNs is the transmission of a large amount of data, like images and video, that is becoming more and more required in various applications. A wireless network is very much prone to communication errors. Thus, for the efficient design, large data messages are broken down into smaller fragments and those smaller fragments are transmitted. But this approach introduces the burden of exchanging redundant control packets increasing the energy consumption and the transmission delay. In this paper, I propose a data fragmentation scheme using a block acknowledgment (BA) mechanism to minimize the number of the control packets and delayed transmission caused by fragmentation. I implemented the proposed scheme in typical WSN protocols and compared it with the original protocols through ns-2 simulation. The simulation results verify that our scheme can decrease energy consumption as well as end to end delay.