Research And Application Of NTCIP Protocol In Traffic Guidance Display System

With the development of intelligent transportation system, it has become an integral part of people’s daily life, also provide convenient for people to travel, etc.But in the intelligent transportation communication has been the lack of unified standards.Not only cause traffic management system manufacturers respectively using private agreement, incompatible between the various manufacturers products, causing the waste of resources.At the same time, users of traffic management system in the later maintenance and upgrade all need to spend a lot of manpower and material resources.Aiming at the problems of the intelligent transportation field, this thesis studies deeply the NTCIP protocol and its application in traffic induced display system.Part of the NTCIP protocol are analyzed, and the use of scenarios, etc.In view of the NTCIP protocol under the MIB tree structure and the situation of the network topology discovery, the following research work has been done:(1) To improve the MIB tree construction algorithm, improve the operation efficiency of the algorithm.In this article, through analyzing MIB definition language the ASN. 1’s characteristics to parse the MIB files.MIB tree construction algorithm parse the MIB files to get MIB tree nodes and set the node’s parent. Need to query nodes set, but the set is growing big.Time complexity is very high, the MIB tree generated for a long time.For this kind of situation, in this thesis, by using Hashmap save nodes, reduce the running time complexity, improve the operation efficiency of the algorithm.Through the experiment, the improved algorithm can operatly correctly, reduce the running time of the algorithm.(2) Improve the use of SNMP protocol network topology discovery algorithm to improve the correctness of the algorithm. In a network topology, since the router has multiple ports, each have a different IP. Since the router has a plurality of corresponding IP, in the process of running the algorithm may appear to repeat the router traversal, causing network topology finally found incorrect. By adding a heavy sentence router module, add all the IP address for each router object queue for the router is repeated traversal judgment. Through experimental analysis, the improved algorithm can solve the problems in the algorithm to improve the accuracy of the algorithm runs.(3) Utilization of the previous framework agreement on NTCIP, and the improved algorithm is designed and implemented based on the display protocol traffic guidance NTCIP system. Management system is divided into manager and agent to develop.Manager makes use of network topology discovery algorithm to discover all agent’s display terminal device. Through the management of manager can be well controlled agent, to achieve the agent’s control through a custom protocol.