Next-generation network router technology analysis

Unlike traditional routers, the next-generation network router technology must consider the problem of number translation. Next-generation network routing technologies will be introduced here. When a call is established for a traditional telephone exchange network, the signaling point code of the next exchange board is determined based on the E.164 number of the called phone number, and then the call is routed through the No. 7 signaling network according to the signaling point code, the essence of all call routes is to determine the signaling point encoding according to E.164, and then use the signaling point encoding for call routing.

Unlike the traditional PSTN (PublicSwitchTelephoneNetwork, public switching telephone network) network, the call routing of the Next Generation Network Based on Softswitch is essentially determining the next hop Softswitch Based on the address of the called USER or directly locating the called terminal. The called user's address can be in the form of E.164 number, URL (uniformResourceLocator, Uniform Resource Locator) or IP address.

The convergence of networks and the diversity of addressing methods make the original PSTN network and IP network routing methods no longer meet the communication needs. In the next generation network router technology, the number translation problem must be taken into account. Therefore, it is necessary to study the next-generation network router technology. This article focuses on the key router technologies involved in large-scale next-generation Softswitch networks. These technologies are of positive significance for the development of next-generation networks based on SoftSwitch. The control layer in the Next Generation Network is closely related to the business and needs to deal with various systems, such as routers, application servers, and database subsystems. This is part of the true embodiment of network intelligence. One of the most important problems to be solved at the control level of the Next Generation Network is the router technology problem. So what is the Routing Problem of the Next Generation Network?

(1) User positioning and network addressing issues;

(2) There is a routing connection problem between different NGN (NextGenerationNetwork, Next Generation Network) networks;

(3) questions about the mobile application of NGN users.

Next-generation network routing Solution

1. Hierarchical Softswitch Routing System

For large NGN networks, we use the idea of PSTN layering to divide Softswitch into different layers for multi-level routing. However, the user plane is still carried by end-to-end grouping. NGN network services are divided into two types: Intra-domain services and Inter-Domain services. The intra-domain service refers to the softswitch service in a certain area of NGN. The intra-domain Softswitch service only needs to know the routing information in the region. For routing information not in the local region, you only need to forward the call request to the Inter-Domain interconnection Softswitch that is connected to the intra-domain service SoftSwitch. The service Softswitch in the region focuses on providing a wide range of services for users in the region. The interdomain service Softswitch provides the functions of the router technology for different domains of NGN. Once the number of softswitch routers connected between domains is too large, you should consider dividing the softswitch of Inter-Domain interconnection into multi-level structures, but the softswitch of all services within the level is still a plane structure. This hierarchical routing Static Routing Method follows the multi-level Routing System of the PSTN network. The advantage is that the routing data of each Softswitch is relatively simple, and the network structure of the entire network is very clear.

2. Locating Server Routing System

The requirements for NGN determine that any switching device in the network can directly locate the peer device, without the need to send call signals by jump, you can set the shared location server in a centralized manner to meet such requirements. When a certain area of softswitch expands to a certain number, the locating server can provide routing service for the softswitch in this area. Mutual routing information can be maintained between Softswitch in the domain to ensure rapid call establishment. At this time, each Softswitch only contacts the corresponding locating server. The locating server can locate the target SoftSwitch. In this case, the softswitch stores the complete router technical information of the user within the control range and the routing information between the softswitch in the same domain. At the same time, you can also consider establishing a local ing library for some common addresses in the softswitch or locating server to speed up the call connection. Locate the number of servers based on the network capacity.

The locating server is not a standard network entity defined in the next generation network framework, but a functional entity proposed in the Next Generation Network to solve large-scale network routing problems, therefore, the functions and features of server locating have not been recognized by the industry. Different equipment manufacturers have different practices.

The main function of locating a server is to exchange information between locating servers through protocols, and accept Routing Query requests through protocols. The locating server supports routing information such as E.164, IP address, and URL. It supports multi-layer structure similar to PSTN and can be divided into different domains and layers. All levels of locating servers have the collection and query functions. They provide security services and can implement monitoring and other special services according to users' special needs.