Overload Control Mechanism In Diameter Signaling Nerwork

Diameter is an authentication, authorization, and accounting protocol for computer networks. It evolved from and replaces the much less capable RADIUS protocol that preceded it. Diameter Applications extend the base protocol by adding new commands and/or attributes, so it has good scalability. Diameter protocol proposed in the 3G period, used in the LTE period, and recommended as an AAA protocol in the NGN mobile IP network. But with the rapid growth of mobile users, the emerging of new network services, Diameter Signaling Network (DSN)will face a big challenge. In the event of a link failure or the diameter server restart, these will resulting network congestion and even evolved into EPS signaling system storm problem, In order to avoid congestion,we need to study the settlement mechanism of Diameter Signaling Network Overload or Signaling Storm. Based on this, carried out a series of research work need to been conducted.The thesis consists of three parts. In the first part, we discuss the basic message format of Diameter protocol and the process of Diameter message routing. We discuss some basic functions of DRA (Diameter Routing Agent), and the relationship between DRA and Diameter node.Diameter Signaling Network composed of Diameter signaling Nodes and the important interfaces.The second part, thanks to the work done in the China Mobile Research Institute. The congestion control mechanism of the DRA node based on the Diameter Signaling Network is studied and a scheme to suppress the invalid rerouting overload of the DRA node at the edge is proposed. The local overload suppression is performed by using the feedback information returned from the Diameter server, due to this schedule the re-election of the network traffic is greatly reduced, and avoid unnecessary waste of node resources and link resources. Then the test of the mesh network and plane network of this mechanism is conducted.In the current Diameter Signaling Network, the relationship between the Diameter nodes is statically configured, there is no flexibility. With the increase of the network element nodes, management and maintenance cost will be huge. Especially for the congestion of the signaling network is quite unfavorable. Similarly, in the third part, in order to suppress the network overload and make full use of the feedback information, we use the end-to-end overload control mechanism to study an overload control scheme of the Diameter Signaling network entry node based on rate adaption. Diameter Rate Overload Control (DROC) is implemented at entry edge node. This module runs a Diameter Rate Adaption Algorithm(DRAA) algorithm based on Diameter network, and evaluates the algorithm through the parameter of competitive and responsiveness. The experiment shows that the algorithm is simple and easy to deploy.Diameter network entry edge suppression mechanism greatly saves network resources, it can be a good prevention of signaling storms.