Co-Agent: A Cooperation-Agent Reputation System over Mobile Ad Hoc Networks

• Main Authors: Yu-ren Chen, 陳昱仁
• Other Authors: Hui-Tang Lin
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/20200336601985551702

碩士 === 國立成功大學 === 電腦與通信工程研究所 === 97 === In a Mobile Ad hoc NETwork (MANET), node cooperation in routing and packet forwarding is essential for the network to operate properly. However, in order to save resources (e.g., energy, memory, CPU cycles and so forth), some misbehaving nodes might not intend to forward packets, which significantly degrade the network performance. To cope with such misbehavior phenomena in MANET, this thesis proposes a cooperation-agent reputation system, designated as Co-Agent, which consists of three schemes designed specifically to detect and avoid selfish nodes for mitigating the effect of routing misbehavior, to designate agents for finding an alternative route in the present of selfish nodes, and to allow misjudged nodes which have been isolated from the network to redeem their reputation and rejoin the network. Unlike current proposed schemes in the literature which only support the DSR routing, Co-Agent can be applied in both DSR and AODV routing mechanisms. The proposed mechanism is implemented in the Qualnet simulation environment. Simulation results confirm the proposed Co-Agent mechanism has improved the network throughput significantly.