QoS Context Transfer Technical Research Based On Mobile IPv6 Network

Development of various wireless inserting technology brings great changes to the Internet architecture based on Ipv4. Introducing of a great quantity of wireless equipments, on one hand, further aggravates the lackage of Ipv4 address resources; on the other hand, advances the mobility request to IP network. The new Internet protocol of IPv6 solves these two problems. Ipv6 carryes on the advantages of Ipv4, and also conducts large modification and function expansion according to the working experience of IPv4 in the past more than ten years. First, IPv6 extends the address length from 32 bt of IPv4 to 128 bt, which has almost endless address space. Second, through the expansion of mobility function, IPv6 provides mobility administration mechanism at the level of IP which is mobile IPv6. It makes node still keeps IP communication while roaming among different wireless technical network.In the future network, IPv6 will provide a unified transfer platform for many business such as data, sound, and video frequency. But the merge of many business also has higher function request for the mobility of IPv6. In addition to keeping IP communication, it also should ensure that it won't cause the decline of service quality because of the mobile switch. So, it needs switch optimization.There are two goals of mobile IPv6 switch optimization. One is to decrease the time-delay of switch and the loss of data packet, and the other is to cut down the signalling spending because of the switch. The switch of mobile IPv6 can be divided into link circuit switch and IP switch. The present IP switch optimization research includes quick switch, context switch and micro-switch(that is the move in the same administration area).This thesis studies Qos context transfer technology based on mobile IPv6 network, and the main work and achievements include:1. The thesis studies the theories, charaterstics and shortcomings of Qos system based on IPv6 and context transfer technology based on present QoS, analyzes and summarizes the elements in switch time-delay while transferring and the packet loss, and probes into methods to reduce time-delay.2. For the problem that the traditonal Real-time business based on Intservl/RSVP cannot realize the transparent transfer so as to cause the time-delay being too long or trembling problem, the thesis proposes an improved RSVP context transfer framework of mobile IPv6. Through adding context transfer function to AR, it can save the prepared time, and through realizing transparency, reduce the service interruption. While switching MN, real-time applications can be quickly transmitted with the same treatment before the switch.3. The thesis presents a context transferring frames of mobile IPv6 in end-to-end DiffServ, which adopt COPS-SLS agreement as DiffServ in mobile environment signaling mechanism to realize end-to-end domain between SLS dynamic consultations . This framework uses end-to-end context transfer method to reconstruct DiffServ context may avoid re-launch the COPS-SLS signaling , and the end-to-end DiffServ context only shifts in the path of the new increase between QB shift.4. The thesis puts forward a context framework which combins DiffServ and M - MPLS for the need of real-time Qos business in the network. Using MPLS having the character of combining with mobile environment, it combines DiffServ and M-MPLS to provide QoS guarantee in the mobile main network, using the context transfer techinology to reduce time-delay of node switch and packet loss, which provides scalable and highly efficient QoS solutionsfor the 4G mobile network in the future .5. Finally, it summarizes the research work, and technology of the Mobile IPv6 of the concept QoS context transfer is propected.The aim of this research is to optimize the switch technology of the mobile communication, improving the QoS in the environment of the mobile communication, then we can satisfy the need of real-time business and that of people's work and life.