무선 애드혹 망에서 전송효율증대를 위한 제어프레임 설계

Abstract

IEEE 802.11 wireless networks support control frames like that RTS/CTS (Request To Send/Clear To Send). Control frame support efficient wireless network. Hidden node problem and exposed node problem will occur to frame collection. Control frame take preventive measures to frame collection. It helps to solve the hidden node problem but decreases the throughput rate. It also brings change in NAV state of other wireless nodes in the same cell. However, Wireless nodes make false node problem in NAV state. We propose a reformed control frame. Conventional control frame have 24 bytes field. However, RTS use only 20 bytes. RTS has composure extra space of 4byte. Also CTS use only 14 bytes. CTS has composure extra space of 10 byte. We propose check channel field. This field composed of 4bytes. Check Channel field support to wireless nodes. Nodes can escape in NAV state. This method can escape when data received to wireless nodes on schedule time is continued by 0 in NAV state. Check Channel may supported to check channel after wireless node begins to transmit data frame. We perform comparative analysis in terms of delay(sec) and load(bist/sec) with reform RTS/CTS method which proves the efficiency of the proposed method