| The mobile communication network based on IP technology is the certain trend for the development of mobile communication technology.3GPP2 organization has proposed CDMA2000 Spread-spectrum mobile communication network which bases on IP technology. In the process of combining IP technology with mobile communication network, a few improvements need to be made on some protocols of traditional TCP/IP protocols stack. The improvements are in the purpose of strict telecom demands of the mobile system. ZXC10-BSS software system is a large-scale distributed system applied into the mobile communication area. It is composed of many modules which communicate with each other through specific protocols, the system functions as a whole is through the mutual coordination among modules.This dissertation focuses on the research of the choice of the transmission layer in traditional TCP/IP protocols stack in mobile communication network. Nowadays net-meta always uses Ethernet as communication network, According to the characteristics of net-meta's internal communication, this dissertation has made detailed comparison of and done research. UDP is employed as the supporting protocol at the bottom of control-flow communication. Based on this, Reliable UDP is proposed to realize the reliable transmission. Reliable UDP adds a layer between transfer layer and application layer to ensure the reliable data transmission. A five-layer network architecture is established with UDP as the supporting protocol. Reliable UDP makes use of UDP to implement a kind of link-oriented and reliable data-transmission mechanism based on messages. Reliable UDP integrates the reliability of TCP and the high efficiency of UDP. The operation of Reliable UDP module relies on two tasks. One is UDP-driven task,the other is protocol processing task. The two tasks can cooperate with each other to maintain the state machines of every link and implement receiving and sending message.According to the characteristics of system control-flow transmission, this dissertation has designed and implemented a testing tool of control-flow transmission. The tool has done many tests of Reliable UDP module in ZXC10-BSS system. The tests have promoted the constant optimization of Reliable UDP module. The testing data shows Reliable UDP technology can ensure the performance requests of the signal data transmission in the system. Meanwhile, the reliability and high efficiency of mobile communication can also be satisfied. At present, the module has successfully applied into ZTE ZXC10 mobile communication systems. |
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