경쟁 기반 무선 네트워크 환경에서 전송효율 증대를 위한 제어 프레임 설계

Abstract

In modern society that gives priority to information, mobile service technology has been widely used in many areas based on its mobility and conveniences in its use. As the wireless communication technology has been developed, its users wish to have higher quality of service without any restriction in their behaviors anytime, anywhere. Kind and number of two-way nodes used have been increased owing to the development of wireless network and communication frequency among two-way nodes have been also increased. Consequently, data error and decline in transmission efficiency have been emerged as urgent problems. A number of studies have been performed to solve these problems and current transmission methods of wireless network use control frame and frame segmentation method to increase transmission efficiency selectively. This transmission method decreased data error by reducing conflicts among frames, but there may be other problems in the side of transmission efficiency. As one of the problems, when cells are overlapped a little but there is two-way node and it is involved in wireless network, nodes within overlapped cell is converted into back-off state and then communication is impossible. This study suggested how to escape from standby by complementing these shortcomings and the way to transmit data safely without using frame segmentation method. In other words, it designed RTS (Request to Send) and CTS (Clear to Send) which can control wireless communication which is the problem in wireless network more efficiently to solve the problems caused by hidden nodes and exposed nodes. In addition, it designed a new control frame that mobile condition can escape from NAV (Network Allocation Vector) when data received to mobile for the fixed hour are continuously 0 and suggested how to enhance communication efficiency of wireless network for achieving more efficient communication environment.