分布式系統(tǒng)的時間化通信行為模型
[Abstract]:With the continuous development of network technology, the Internet of things / physical information fusion system has become a hot research and development. A typical example is the Intelligent Transportation system (ITS).) As the medium of information exchange, communication has become one of the core problems in the research of Internet of things. In its, vehicles can communicate with service centres (V2I) to inform other vehicles of their presence to facilitate vehicle safety monitoring and safe driving, and can also communicate with vehicles (V2V) to improve traffic safety. Avoid serious traffic accidents. It is very important to study the real-time communication of this system. Distributed system communication places more emphasis on logical clocks. In this paper, a new time network communication model (Timed-pNets) for distributed system communication is proposed. The model includes the logical clock (Logical Clock), time specification, (Timed Specification), time parameterized label migration system, (timed Parameterized Label Transition system timed-pLTS, and other basic components. Timed-pNets is a tree hierarchical structure model, the leaf nodes of which are expressed by Timed-pLTS. A non-leaf node is an abstraction of a subnet and is used to synchronize communication between subnets. The main contributions of this thesis are as follows: a distributed Timed-pNets model with synchronous and asynchronous communication is proposed. Based on the introduction of temporal action to form action logical clock, the label in the timed pLTS system (Timed-pLTS) .Timed-pLTS is established as the logical clock, which is used to trigger the system to migrate from one state to another. In this paper, the channel is designed as Timed-pLTS, which has two action logic clocks, message receiving and transmitting, which are used to describe asynchronous communication. Based on Timed-pLTS, this paper constructs a Timed-pNets model, whose synchronization vector is used to describe the synchronous communication between different nodes. The concept of time gauge (Timed Specication) is proposed to study the compatibility of Timed-pNets with (Compatibility) and delay (Delay). Time specification is defined as the relationship between a set of logical clocks and these clocks, including clock precedence and clock synchronization. In this paper, the concepts of clock division and clock merging are proposed to simplify the time specification, and the semantics of clock precedence and synchronization relationship are studied. A set of algorithms are designed to transform Timed-pLTS and Timed-pNets into time specification. A set of theories and methods for building hierarchical models using time specification are presented. In this way, people can design communication systems flexibly: they can design leaf nodes first, then combine them into Timed-pNets nodes to build up the system layer by layer, or they can design an abstract Timed-pNets system first. Then we use the concrete Timed-pLTS to instantiate each abstract hole in the system to construct the system from top to bottom. Taking the communication between vehicles in the intelligent transportation system as an example, how to establish the Timed-pNets model is realized. And check the security and time nature of the communication. The TimeSquare tool is used to complete the test of these properties. The results show that the timed-pNets established in this paper is universal and flexible.
【學(xué)位授予單位】:華東師范大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2014
【分類號】:TN915.01
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