A Study On Communication Mechanism Of Mobile Agent

With the development of Internet, mobile agent, which is come from Internet and mobile computing application, has more concern by people. In brief, it is an independent computer program, which can transport itself from a node to another independently in a Heterogeneous network. It looks for suitable resources and utilizes the advantage of in the same host or network with these resources, and deals with or uses these resources nearby, finish the specific task on behalf of users. Compared with methods, such as traditional RPC etc., it has the advantage of save the broadband of the network, decrease delay and support calculating off-line etc.These unique technological advantages of Mobile Agent make it get fast development in ten years and it is widely used in a lot of aspect such as e-commerce, personal assistant, security proxy, distributed information retrieval, work flow, etc.Communication plays an indispensable key part in mobile agent. In several of situations, MA at different hosts or nodes of network must cooperate with one another by sharing information and making decision collectively. So, a reliable communication mechanism must guarantee effective communication among agent. But, because of mobility and autonomy of mobile agent, the communication mechanism of mobile agent is different from communication among the general agent. In the process of communication among mobile agent, there commonly exist communication failure and message chasing. So it is need to set up a good communication mechanism among mobile agent. In the communication mechanism, the key is to solve the two problems.Communication failure (CF) is defined as the recipient has already left the node when message is sent to a certain network node, thus the recipient can't receive this message. Abnormal phenomenon of this kind of communication is caused by the change of the physics position of the communication body.Message chasing (MC) to mean in the situation that agent is migrated very fast, each time when message reaches host, MA has moved in advance to the next host, message may be followed target agent go around but can't be reached forever.CF and MC problems are general existing problems in MA communication. This is unrelated with the network and failure of node, but caused by the mobile characteristic of mobile agent completely. They make cooperating agents unable to receive the coordinate message in time, thus cause the failure in cooperating or even system break down. This is the critical defect of mobile agent system.In recent years, researchers have already proposed a lot of MA communication mechanism solving above-mentioned problems. However, every kind of method has its own assuming, the purpose of design, and method. So, up till now, there is no unified or structured communication mechanism to solve the MA communication problem better.To the above problems, this paper introduces the technology of the information table in the mobile agent communication mechanism. It set up a kind of new-type MA communication mechanism based on technology of the information table. This will solve CF and MC phenomenon in a great extent that can't be solved in current communication mechanism.