The IP metropolitan area network is an important basic network for Internet business operations. In the IP metropolitan area network business operation, the service control gateway is responsible for network user authentication, billing, bandwidth and flow control, and QoS control. It is a personal business, The control point for home business and large customer service access is an important gateway for operators' network operations. With the development of IP metropolitan area networks, service control gateways are constantly evolving.
IP Metropolitan Area Network Service Control Gateway
The IP metropolitan area network is a network between the customer premises network and the IP provincial network backbone network (CMNet network, IP private network).
The service control gateways of the IP metropolitan area network can be basically divided into two categories: BRAS and service routers, which perform access control on individual home users and large customer users, respectively.
BRAS is a broadband access server. Its main function is to perform Layer 2 termination, authentication, accounting, and management of broadband users, and it is the next-hop gateway for broadband users on IP. At present, IP technology has become the mainstream of metropolitan area networks, mainly providing GE / FE and various POS interfaces. The ATM-based BRAS has basically been eliminated. The current BRAS are all IP-based BRAS products. When the broadband users of the metropolitan area network develop to a certain scale and enter the user-intensive phase, the original BRAS centralized side-mount has become the performance bottleneck of the metropolitan area network. Therefore, the distribution of the BRAS direct end office has become an inevitable choice for the development of the metropolitan area network. .
The service router is at the edge of the IP network and is responsible for accessing user services. Correspondingly, the core (backbone) router is at the core position of the IP network and is mainly responsible for the scheduling and forwarding of relay traffic. The earliest service router is the product of the integration of dedicated line access router and MPLS VPN PE router. With the rise of broadband services, services such as NGN, IPTV, and 3G need to be carried within the metropolitan area network. Therefore, service routers no longer only provide dedicated line access and VPN interconnection functions for major customers, but also need to face business users or even individuals. Users carry IPTV and NGN services, and the need for service routers has been greatly expanded.
How to deploy BRAS and service routers in the network in the future and how to achieve access to different services is still a focus of the development of IP metropolitan area networks.
Facing the challenges of business transformation
Business transformation puts forward such a problem for telecom operators, that is, to integrate the service layer, unified core layer and transport layer, expand the network integration and service integration capabilities of the access layer, and create a new generation telecommunications network with comprehensive support capabilities. The enterprise's business transformation provides support, transforming a complex network with independent separation and multiple levels into a simple network with integrated functions, flat architecture, and controllable users and services. This requires integrating existing network resources to form a flat network architecture with strong comprehensive support capabilities; requiring the integration of existing technologies and networks; requiring an open business platform; requiring extension to home networks and enterprise internal networks, based on The same network provides comprehensive information services to all users.
The IP network can not only carry all kinds of services, but also because its service transmission is based on bandwidth-sharing packet switching, its transmission cost is much lower than the traditional telecommunication network based on circuit switching. In order to realize the business transformation of telecom enterprises and migrate various services to IP networks, it is necessary to solve a series of problems faced by the existing IP networks in terms of service security, reliability, service quality and operability. Carrier-class network transformation. The goal of transformation is to build a commercial IP network that is comparable to traditional telecommunications networks in terms of operability and reliability. On a commercial IP network, in addition to carrying Internet services, it can also carry voice and major customer line services migrated from traditional telecommunications networks, while also providing video, multimedia, games, entertainment, P2P point-to-point communication services To enable network operators to change from basic network providers to integrated information network service providers, and to realize the knowability, manageability, operability and reliability of IP networks for services.
In order to meet the security, QoS and service manageability requirements of the current IP network for multi-service bearers, multiple service gateways (including BRAS, SR, SBC, GGSN, etc.) need to be deployed on the current IP network ). Under the full-service operation model, if the network is still built according to the traditional service gateway construction model, that is, the corresponding service gateway is continuously superimposed with the development of the business, which will lead to problems such as increased operation and maintenance costs and complicated network deployment.
Key technology of multi-service control gateway
In order to solve the current security, QoS and service manageability issues faced by IP networks for multi-service bearers, operators need to integrate existing network resources, unify the core layer and the transport layer, expand network integration at the access layer, and Service integration capabilities form a flat network architecture, transforming complex networks with independent separation and multiple levels into simple networks with functional integration, flat architecture, and controllable users and services. At the same time, deploy business control nodes in the network to perform aggregation, legality verification, business perception and differentiated services on various types of services at the edge of the network, so that it has strong comprehensive business support and operation management capabilities. This gave birth to a new generation of IP metropolitan area network architecture, as shown in Figure 1.
Figure 1 Network structure of IP metropolitan area network after transformation
When the edge-to-multi-service network is aggregated and enters the IP core network, operators need to implement security and QoS control strategies for the services to ensure that various services have a legal identity and clear QoS requirements to securely access the IP core network. The IP core network provides corresponding QoS services to various services according to the instructions of the edge equipment, so as to achieve the purpose of supporting and operating management of integrated services. These functions are implemented by deploying multi-service control gateways at the edge of the core network.
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