Research On Key Technologies Of The Multihomed Terminal Based On The Universal Identifier Network

With the development of technologies,information network has become a great power to promote social progress.Economic and social development requires the network to provide service at anywhere, anytime and in anyway, which still has a certain distance with the target. The Universal Network and Service System is a novel network architecture based on the identifier, which provides the service according to users'needs;by separation and mapping between the identity and location information, requirements for routing scalability, mobility, multihoming and QoS are realized. The trusted design also supports the security, reliability, controllability and manageability.At present, the network service types have evolved from the common files download and web browsing to the real time online audio and video stream, the multimedia network conference, online games and so on. Users have high requirements for obtaining the quality of service, the continuity and reliability for the network access as well as the instantaneity for the data transmission. The Universal Identifier Network can support multiple accessing technologies,which can be used for multihomed terminals to fulfill those demands.So how to allocate network traffic and use the resource effectively are the urgent problems to solve for obtaining the reliability and availability for network transmission.By investigating characters of the Universal Identifier Network and the multihomed terminal, this paper proposes some key technologies for the multihomed terminal in the Universal Identifier Network, which can improve the reliability for network transmission and increase the resource utilization. The specific work is as follows:(1)On the basis of analyzing characters and drawbacks for the traditional fault tolerant protocols and schemes,this paper proposes the fault tolerant scheme for the multihomed terminal in the Universal Identifier Network(MTB-FTS).The scheme constructs mathematical models both for node and network faults, and analyzes the link requirement, path capacity and the probability of failures for multihomed terminals towards distinct fault types.Then the paper analyzes influences caused by link handoff latency, network throughout and cost of the protocol.(2)By analyzing drawbacks of the usual load allocation algorithms,this paper develops a Mapping Based-Dynamic Load Allocation Scheme(MB-DLAS) to fulfill transmission demands for the multihomed terminal in the Universal Identifier Network. MB-DLAS optimizes the mapping from data packets to the network links by dynamically adjusting the allocation weights to realize the dynamic load allocation among several links and improves the network performance. During the transmission, data packets are ranged on the basis of real time mapping calculation, which increases the links utilization and reduces the network cost.(3)The Universal Identifier Network introduces the concept of the Multihomed Stub Network, which provides the multihoming access for Intranet. So this paper designs a load allocation method on the basis of the non-cooperative game theory. Then paper analyzes the flow distribution and cost in the Multihomed Stub Network and constructs the mathematical models for QoS requirements and user costs.Then the paper develops an optimized Load Balancing Scheme(LBS)which uses the transmission time as the network cost. The object is to reduce time and increase the ISP payments.(4)This paper proposes a Dynamic Link Management Algorithm (DLMA) for the multihomed terminal in the Universal Identifier Network. DLMA allocates and releases the links according to the terminal requirements.By analyzing the required links when using the distinct allocation and releasing strategies for the multihomed terminal as well as changing the link delay requirements, DLMA is used to compare with ideal and static link management algorithms to verify the effectiveness.(5)In order to improve the flexibility of accessing for the multihomed terminal, this paper designs a Dynamic Path Selection Scheme (DPSS)to optimize the network resources utilization. In order to improve the resource utilization, the paper proposes a balanced accessing distribution rule based on terminals.By estimating the path capacity and available bandwidth,terminals can dynamically select the optimized accessing point, which fulfills the requirements of real time link accessing and selection. DPSS also can be deployed in the traditional network.