Ahmad Rostami - Department of Computer Engineering, Qazvin Branch, Islamic Azad Univiersity, Qazvin, Iran
Sajed Dadashi - Department of Computer Engineering, Roudsar and Amlash Branch, Islamic Azad Univiersity, Roudsar, Iran
Hassan Rashidi - Department of Mathematics and computer Science, Allameh Tabataba'I University, Tehran, Iran

Mobile agents are computer programs that act autonomously on behalf of a user or its owner and travel through a network of heterogeneous machines. Fault tolerance is important in their itinerary. In this paper, existent methods of fault tolerance in mobile agents are described which they are considered in linear network topology. In the existing methods three agents are used to fault tolerance by cooperating to each others for detecting and recovering server and agent failure. Three types of agents are : acent which performs programs for its owner, witness agent which monitors the actual agent and the witness agent after itself, probe agent which is sent for recovery the actual agent or the witness agent on the side of the witness agent. Communication mechanism in the methods is the message passing through these agents.The existing methods are considered in linear network. We introduce our witness agent approach for fault tolerance mobile agent systems in 3-Dimensional Mesh (3D-Mesh) Network. Indeed Our approach minimizes Witness-Dependency in this network and then represents its algorithm.

Mobile Agent, Witness Agent, Fault Tolerance, Node, 3D-mesh Network