Research On Cooperation Of MANET Routing Protocols

Advances in wireless technologies have enabled mobile devices to connect with each other to form mobile ad hoc network. Due to the absence of central infrastructure, transmission of information requires the nodes on the path cooperate to each other to complete the multi-hop. So promote nodes to cooperate becomes a main means to support the performance of MANETs. In the open, decentralized network system, cooperation incentives should be able to do three things:(1) cooperation incentives that effectively encourage nodes to offer services and thwart the intentions of selfish and malicious nodes,(2) cooperation incentives that are efficient to deploy, use and maintain, and(3) routing to efficiently deliver messages with less overhead and lower delay. Every mobile device labors under a resource constraint make cooperation incentives faces challenges. While most previous cooperation incentive mechanisms rely on either a reputation system or a price system, neither provides sufficiently effective cooperation incentives nor efficient resource consumption. Also, previous routing algorithms are not sufficiently efficient in terms of routing overhead or delay.In order to improve the trustworthiness, collaboration and efficiency of MANETs, this thesis study and combined the reputation system and virtual currency system, proposes a comprehensive mechanism: Reputation Currency System(RCS), to provide reliable service. In order to study the effect of these mechanisms, game theory was used to analyze strategic interaction among independent rational selfish nodes with conflicting interests. Analysis of this three promotion mechanisms shows that, integrated approach proved more effective than the previous two mechanisms to promote cooperation and selfish nodes detection. RCS use more reliable settlement of reputation and monetary by assessment center node, preventing the over-reliance on nodes’ trustiness, a node can also be from the tedious calculation of reputation and currencies pulled out to improve the efficiency of network transmission. Later, this thesis realizes RCS and compare with the reputation mechanism and currency mechanism in NS-2.This thesis, modifies on the basis of classical MANET routing protocols AODV, based on the RCS for application of discovery process, proposes a new routing protocol: RC_AODV. The new routing protocol enable: evaluate the cooperation of transmit path, punish non-cooperate nodes. By blacklist of nodes in the network to distinguish treatment, the uncooperative node will be added to the blacklist, the service request of blacklist nodes will be rejected by other nodes, blacklist nodes can be their own "whiten" to rejoin the network nodes through collaboration. Finally, this thesis using the NS-2 network simulation software to achieve the new protocol(RC_AODV). In two conditions: without and with malicious node, compare the network overhead and packet delivery between RC_AODV and AODV.