Design And Application For A Reliable UDP Protocol Of Multi-ends In Wireless Network

Recently, with the rapid development of mobile devices and network technology, what people focus on has been gradually changed from PC to microprocessor, from wired transition to wireless transition. No matter small data (file), or large data (audio, image and video), wireless and mobile transmission technology has been the inevitable trend of development. Based on the background, we discuss the efficiency and reliability of a wireless data transmission for mobile research devices.The implementation of wireless data transmission for mobile devices, using TCP and SCTP can guarantee the reliability of data transmission, but the complexity of the control mechanism, resulting in low transmission efficiency; UDP abandons the guarantee of the reliability, but it has a high performance in transmission efficiency. Combining the strength of the two protocols, the researcher propose a reliable UDP (Reliable UDP, RUDP) protocol, RUDP not only be able to ensure the reliability of data, and also has a high efficiency. Consider the needs of project, we study some related research for reliable and efficient UDP protocol, and propose a reliable UDP protocol of multi-ends in wireless network (wireless multi-ends reliable UDP, WMRUDP).This thesis based on traditional UDP, design a variety of reliability assurance mechanisms at the application layer, such as the recognition mechanism, retransmission mechanism and congestion control mechanisms, to ensure the reliability of data transmission, in addition we design a link maintenance mechanism to meet the actual needs. The design of hardware using Atmel UC3A3as micro control unit, Wifi module for networking, and external memory for file storage, and use WMRUDP protocol for data transmission. Finally, analysis the result with transmission efficiency and the number of terminal, the experimental results showed that:the performance of the device is fully consistent with expectations, can well meet the actual demand of reliability and efficiency in file transfer, and the devices have been mass-produced and used successfully.