Design of a Collision Avoidance Scheme for IEEE 802.11-Based Cognitive Radio

• Main Authors: Yan-Liang Lin, 林彥良
• Other Authors: Huei-Wen Ferng
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/26bf33

碩士 === 國立臺灣科技大學 === 資訊工程系 === 99 === In a wireless Cognitive radio network, how do Secondary Users select an idle channel to transmit is an important issue. However, if there are Primary Users need to transmit data after Secondary Users get resource and start to transmit , in order not to infringe upon the rights of Primary Users of the transmission, Secondary Users must be interruptted . In view of the IEEE 802.11 standard, Primary Users need to wait for an idle period called DIFS , and success in the competition to begin transmitting data. The perception of wireless networks in a variety of literature, not specifically describe how Secondary Users detect the Primary User's transmission needs, but also rarely provided details on the secondary users's data transmission interruptted by Primary Users. Therefore, this paper for this lack of features in IEEE 802.11 networks under consideration, proposed a collision avoidance mechanism and resume mechanism of both the Primary Users and Secondary Users Through simulation results, we show that our mechanism proposed in this paper can outperform the closely related mechanisms on throughput, average hopping times, and Primary Users' average delay time .