Research On SCTP CMT In Vehicle Network

Vehicle wireless communication network is the basic platform of information exchange within Vehicles Network.It can be used to collect the real-time traffic information, broadcast security and navigation information, and provide other kinds of information services to vehicles.However, the communication environment of Vehicles Network is a fast-moving wireless network environment, with extremely fast change of network topology. Therefore, the frequent path switching, the uneven flow distribution, the high packet loss rate, the blocking of receiver buffers are vital problems in vehicle network communication.The diversity of the network's access modes enable the multi-path parallel transmission. Compared with the traditional single-path transmission, multi-path parallel transmission can significantly relieve the problems mentioned above. Therefore, this article applies the multi-path parallel transmission to the Vehicles Network.The following includes our main research topics:Firstly, a path management mechanism based on the path parameter is proposed. Improvement strategies have been proposedfor the path selection of data transmission, path monitoring and list update, fast path-switching etc. Besides, simulation experiments are conducted to verify the efficiency of the improved route management module to select, manage and switch the routes quickly.Secondly, a flow allocation algorithm is proposed based on the load feedbacks. The characteristics of multi-path network fit with the flow allocation model of the transportation network very well in related studies. Therefore, we apply the model of the transportation network to the model of flow allocation model.The node group queuing can lead to data loss and network congestion.So, this paper considers the situation of group queuing as one of the modifying indicators for allocating the flow.At the same time, the decline of the wireless signal will lead to the change of the path bandwidth.Therefore, the bandwidth allocation is also considered as a modifying indicator. Finally, a simulation environment is set up and simulation experiments are conducted to testify the reliability and real-time attribute of the data transmission for the modified flow allocation method.Finally, this paper proposes a congestion control mechanism based on the reasons of packet losses, as well as a retransmission strategy. The reasons of the data packet loss under wireless transmission environment are analyzed and several corresponding control mechanisms are proposed. Simulation results show the improved congestion control mechanism can effectively reduce unnecessary reductions of congestion windows and improve the throughput.In order to address the packet losses, retransmission strategy based on path parameters is proposed. Simulation results prove that the improved retransmission strategy can transfer the data to receive terminals as quickly as possible, reduce the duration while the data is out of order, and reduce the influence to the cache of receiving terminals.