Exploring Multichannel MAC Protocols in Cognitive Radio Networks

• Main Authors: Chih-Yang Chien, 簡志揚
• Other Authors: Chuan-Ming Liu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/96tn56

碩士 === 國立臺北科技大學 === 資訊工程系研究所 === 96 === In cognitive radio networks, how does communication nodes effectively sense and compete for the wireless network transmission bandwidth is a very important subject. Although the IEEE802.11 standard provides multiple channels for the Wireless Local Area Network (WLAN), but its Medium Access Control (MAC) is designed for transmission on single channel. Using CSMA/CA scheme can avoid collision and packet loss. However, the neighbors of transmitting nodes must wait until the transmission is over to establish their own communication links. Based on the CSMA scheme, CT-MAC can achieve concurrent transmissions without interfering primary communication links. In this thesis, we first revise CT-MAC to increase the throughput. Then, we consider the multi-channel environments and propose a multi-channel MAC protocol which can solve the Multi-Channel Hidden Terminal problem. Our experimental results show that the proposed MAC protocols can reduce access time and transmission time as well as increase the throughput dramatically.