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In order to better address the problems like the inefficiency and large expense of various Ad Hoc routing protocols, this paper using OPNET simulation tool for the performance of DSR routing protocol simulation, build a small-scale (30 nodes), medium size (50 nodes) and large-scale (100 nodes) the complexity of the mobile ad hoc network model, the DSR routing algorithm, the average route discovery...
In order to solve the problem that the technology can not satisfy VPN consumer's need about information insurance for the safety resolving tradition's, in the main body of this essay, we have being aimed at it's safe hidden trouble on the basis going deep into the operating principle studying VPN's, have brought forward one kind of scheme, this scheme passes an introduction invade check system, excavate...
For MAC (Media Access Control) protocol not providing QoS(Quality of Service) guarantees. With the increase of multimedia sevices in wireless networks(for example:voice, video, etc), when the networks get crowded, real-time applications will decrease its performance. We proposed a wireless network algorithm for 802.11e, witch supports fixed nodes and mobile nodes, and also swiches and new connections...
For real-time multimedia communication has strict QoS (Quality of Service) requirements for network, especially it is very sensitive to packet loss rate and delay jitter. When the communication network becomes seriously congested, a Bi-directional Resource Reservation model solution is proposed. This scheme supports the QoS priority and Bi-directional Reservation. The results show that the internal...
In order to avoid routing overhead and reduce management fee for transmisson of routing information, we purposed two heuristic algorithms which are self-pruning algorithm and dominant pruning algorithm. This algorithm is more efficient than the aimless flooding in wireless networks, and redused unnecessary transmission of information and nodes switching by the movement between neighbourhoods. Result...
Aimed to the limitations of traditional routing algorithms and to perfect MPLS application in the domain of load balance, an algorithm of static load balance based on topology is designed in this dissertation. When the shortest path is congested in the network, the algorithm is used to find a low load sub-shortest path for the congestion path based on the bandwidth occupied situation and the topology...
In order to solve the problems that the process of the evolution is only in one step and the investment in network is so costly when the network in nowadays evolutes to NGN(Next Generation Networking), this paper has get a deep research about the soft switch, media gateway control protocol, access gateway and media server and such kind of technology and then submit a kind of design methodology, through...
An estimation suited for network VBR (Variable bit rate) service parameters in the ATM(asynchronous transfer mode) network In order to guarantee the quality of service in the ATM network effectively satisfied userpsilas request, this paper proposed a new kind of method to estimate the service parameters in the VBR ON/OFF source model. According to different service parameters, this method could satisfy...
xAd hoc networks are characterized by multi hop wireless connectivity, frequently changing network topology and the need for efficient dynamic routing protocols, compare the performance of two prominent routing protocols for mobile ad hoc networks. xDSR (dynamic source routing) and AODV (ad hoc distance vector routing). A detailed simulation model with MAC and physical layer models is used to study...
In view of bandwidth requirements in ATM (asynchronous transfer mode) network, a kind of dynamic bandwidth allocation scheme has been proposed. It solves the problem of low bandwidth utilization ratio caused in VBR (variable bit rate) MPEG (Moving Picture Experts Group) video transmission, the simulation experiment curve indicates that with the increase of already bandwidth value, the average cell...
For MPLS VPN (Multi-Protocol Label Switching Virtual Private Network) not suitable for the complex business logic and application with high security requirements because of its lack of providing encryption and certification, a scheme of enhancing MPLS VPN QoS is proposed. It uses the method based on "Log-infinitely Divisible Cascades", realizes fine-grained security service strategy by integrating...
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