A Research Of Real-time Communication Technology Based On Embedded IPv6

First, this paper analyzes the mechanism of IPv6 QoS by introducing the limitation of IPv4 (such as address scarcity, inefficient router selection and QoS lack, etc.) and the technical advantage of IPv6 (such as QoS support, etc.). By detailedly analyzing the RTP/RTCP, QoS and the mechanism of visiting the Traffic class and Flow Label of IPv6 header, the article implements RTP/RTCP protocol in embedded IPv6, and provides the mechanism of QoS of network. It will be the reference of stream media technology in IPv6 network. By analyzing the embedded Linux and the new characters of Linux2.6, the implement technology of IPv6 is researched based on embedded Linux.The real-time problem of multi-media applications must be solved in application and network layer, and to meet the all kinds of application's requirements. The services use accepted paths with multiple QoS parameters (such as bandwidth, delay, delay jitter, loss ratio, cost, etc.). In IPv4 and IPv6, such technologies are very insufficiency. QoS routing must be introduced to provide QoS Services. It is important basic network technology.In this paper, it is provided the multi-constraints QoS routing algorithms based on IPv6. The algorithm updates H_MCOP algorithm. Dijkstra's algorithm is used to select postpaths at the first step of routing procedure, and computes the minimum normalized margin, and deletes the links that doesn't meet minimum QoS parameters for every node. It searches for a feasible path using a modified Dijkstra's algorithm with a minimum normalized margin. The algorithm has good performance and achieves good stability.Finally this paper implements the capability testing of RTP protocol, and analyzes the testing result in the IPv4 and IPv6 network. The statistical datas of QoS are obtained from this testing. It tests the functions and characteristics of RTP protocol, and then the conclusion and expectation of the whole work of the task is shown at last. It indicates the research way of real-time communication based on IPv6 for the future, and at the same time, multimedia and IPv6 researchers may draw their inspiration from this paper.