Study On The Information Discovery Service Of Internet Of Things Based On P2P

The Internet of Things (IOT) is a new network concept, it's based on the Internet, make the clients be extend and expand to any goods, and realize exchange information and communications between any goods. It make the Radio Frequency Identification technology applied to content networking, its purpose is to realize the global content objects connected. Therefore, it has the similar requirement of the resource addressing as the Internet, which ensures the interrelated information of the thing in the IOT can be addressed, located and queried in an efficient, exact and secure manner. At present, much big international organizations are researching in the information found mechanism for IOT. But there is no special mature global uniform standards for the information found mechanism. This article begin with the coding method and information storage, analyses the uniqueness of thing networking addressing, find out the differences between IOT addressing and Internet addressing. Based on the detailed analysis of existing information discovery mechanism of IOT, we points out that the existing mechanism has severe security drawbacks, such as the delay of discovery is big, it cannot guarantee that we can find all information of the goods, and so on. In order to design addressing system which suitable for the IOT, based on the hybrid P2P structure and the query propagation mode, which is provide by BRIDGE project, a new mechanism has been put forward.this new mechanism used Chord algorithm. All original ideas of this mechanism include the following:(1) This mechanism based on the hybrid P2P structure, and it can support information distributed storage, achieve balanced load of network node; (2) the super node layer based on Chord algorithm realized routing information quickly forwarding and increase the query efficiency; (3) the mapping table in Super node directly map coded into servers IP address, simplified the items the flow of information discovery mechanism; (4) Overcome the original discovery mechanism recall-precision low problem.Finally, we simulate the Discovery Service based on Chord algorithm by NS2, which is a simulation tool. Verify the correctness of the routing on super node layer, compared with the original C/S mode at two aspects of network throughput and network delay, it proves that this mechanism more superior than ever before.