Real-time Multi-protocol Gateway And Its Application

With the development of society and the advancement of science and technology, real-time data transmission has gradually extended its application field from industrial field to many other areas such as household appliance, monitoring, transportation and entertainment area. But real-time data transmission has two problems, one is that its demand on transmission rate increases, this is mainly because there are more and more multimedia data types available and consumers are demanding higher and higher multimedia service quality; the other is it is very difficult to send real-time data from a network to a variety of networks for the system integrators in order to let different kinds of users (household appliance users, set-top box users, PC users, etc.) located in different networks (telecommunications networks, television networks, computer networks, sensor networks, etc.) enjoy the real-time data services and to implement the real-time data transmission in integrated multi-network environment.The first problem is revealed earlier than the second, thus there are already many mature solutions for the first problem, for example, speeding the network transmission rate, changing network protocol stack , or adopting effective data compression algorithm. In contrary, the second problem is recently revealed under the situation of the gradually worsening of multi-network integration problem. And this research project mainly targets the second problem. The traditional solution for this problem is to integrate within the communicationsubnet, with the advantages of thoroughgoingness and high efficiency, but the disadvantage of implementation difficulty. Because different network protocol stacks vary widely and many of networks do not use TCP / IP protocol stack, it is very difficult to come to an agreement within communicationsubnet, and under normal circumstances you have to change the existing network node software or hardware to get an unified agreement.My research project proposed a solution for the problem of multi-network integration at the application layer through the adoption of hierarchical caching and P2P technologies. Because although different networks vary widely, their basic needs are same----the completion of data sending and receiving, you can design a transport protocol at the application layer unrelated to the communicationsubnet and then complete the data sending and receiving through the tunnel technology, and then multi-protocol transmission was achieved. In order to achieve the integration of various heterogeneous networks, networks are divided into two categories depending on whether they have link management functions or not, and thus, in theory, the integration of arbitrary nature networks is achieved. As the nature of heterogeneous network customers is widely different, we should group customers according to their connectivity and use the two kinds of structures----vector and list to achieve buffer, moreover, we should improve transmission efficiency by introducing P2P technology, then we can ultimately provide the soft real-time service. A real-time video transmission system in the multi-network integration environment has been successfully designed and implemented on the ARM10 platform. Experiments show that the gateway can meet the application requirements for this environment.