Font Size: a A A

Research On Key Technologies Of Service Guarantee For Next Generation Internet

Posted on:2008-04-22Degree:DoctorType:Dissertation
Country:ChinaCandidate:W H LiuFull Text:PDF
GTID:1118360242966085Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
With the fast increment of transmission and processing capability and the introduction of multimedia services, Internet has gradually evolved from a single data transmission network to an integrated transmission network including data, voice, images, video multimedia etc. Providing service guarantee for a variety of media traffics has become an urgent issue for Next Generation Internet (NGI) to be solved. However, the issues of network resource scarcity, supply imbalance, limited support for mobile computing, security call for more specific demands. It is very necessary to deepen the research and efficiently resolve the key issues of resource allocation, QoS routing, mobile multicast, security and sensing microrouting.Supported by National Natural Science Foundation of China (NSFC), "Research on theory and application of dynamic quality of service in IPv6" (No.60272012) and "Theory and key technology of routing protocols in dynamic mutative network" (No.60473001), this dissertation investigates the above stated service guarantee schemes for NGI. The major achievements are outlined as the following.(1) Considering the realtime feature of multimedia traffic, we propose a fair resource allocation scheme for providing stable and reliable routing. For providing differentiated service, we improve and present a novel weighing Max-Min fair allocation algorithm. Average value is used to fast approach the fair resource value, thus improves the convergence rate of this algorithm. Moreover, we strictly prove the stability of this fair allocation algorithm. By setting weighing value for each data stream, this algorithm can realize Max-Min fair allocation with multi-priority. The simulation results show the stability of our algorithm.(2) Utilizing the balance of supply and demand, we propose a method of computing the bandwidth balance value based on the concept of QoS fluctuation function. Moreover, we improve two general QoS routing algorithms: Source Routing Protocol and Distance Vector Routing Protocol. The simulation demonstrates that the improved QoS routing algorithms are capable of balancing networks workload and stabilizing QoS level on routing paths.(3) Combining with two basic multicast mechanisms: bi-directional tunnel (MIP_BT) and remote subscription (MIP_RS), we present a new mobile multicast protocol based on the dynamic multicast agent. It is a compromise between the shortest forwarding path and reducing the frequency of rebuilding multicast tree, thus it achieves its goal for using network resources more effectively and enhancing service ability of network. Simulation result shows that our proposal has a good integrated performance. It is a new efficient mobile multicast algorithm to provide stable service for mobile NGI environment.(4) Towards security mechanism for NGI, we propose a security model based on VPN/IPSec for NGI. This model can provide not only identity authentication, encryption and integrity check, but also adopt IKEv2 to manage key. Moreover, this security model can support VPN through the firewall. A typical case demonstrates that this security model can provide secure service guarantee for mobile NGI environment effectively.(5) Considering the accessing feature of multiple types of networks, according to energy-limited sensor networks and traffic transmission, we propose a novel cooperative wake-up routing algorithm (CWR) suited for wake-up mechanism in heterogeneous sensor networks, thus provide a necessary network topology foundation for realizing low-cost nodes waken up high-cost nodes to perform effective scene monitoring. Simulation results demonstrate that our CWR algorithm is energy-efficient during the wake-up process.
Keywords/Search Tags:Next Generation Internet, Service Guarantee, Resource Allocation, QoS Routing, Mobile Multicast, Security, Sensing Microrouting
PDF Full Text Request
Related items