This article briefly introduces three NGN business models for opening APIs.

First, the business application plane and service provision are all in the carrier's domain.

This is the simplest way, similar to the current intelligent network business model. In this business model, the value chain structure is relatively simple, and the application plane and business are provided by telecom operators, only the relationship between telecom operators and equipment vendors, applications and content providers. Unlike the previous intelligent network, the standard API is adopted, so the business and application content can be provided by other APs rather than relying entirely on equipment vendors. Powerful operators can also develop their own services. In addition, because the application platform and service provision are in the carrier domain, the physical application platform and service provision can be in the same device.

The advantage of this method is that the operator can fully control the key links in the upstream and downstream value chains, and even provide services. It is the most similar to the traditional telecom model and is easy to manage and accepted by traditional operators. However, there are also significant shortcomings, because the application platforms must be different and have poor connectivity or cannot communicate with each other at all. Therefore, once a telecom operator chooses an application platform, business Development is also limited by this application platform. In addition, the interconnection of this business model can only be achieved at the network layer, so due to factors such as interconnection, the operator can only achieve business intercommunication between different networks within the operator at most, however, it is difficult to achieve network communication between different carriers.

The second application platform is controlled by the operator within the carrier region. That is, the operator builds a unified business application platform for business management and control. The operator can sign contracts with the AP or CP to provide services, and the service and application are provided by a third party through open APIs.

The advantage of this method is that there are more than one third-party business provider, so due to their competitive relationship, the competition here includes two levels: first, the competition of business users, second, the opportunity to gain cooperation with telecom operators through competition) will be more active in market development and new business import. In addition, different users of the same service have the possibility of intercommunication.

The disadvantage is that the management is more difficult. The application platforms managed by telecom operators also limit the development of services. If telecom operators need to replace other application platforms for some reason, all service providers must be persuaded to develop based on new services, which may lead to re-development of all services. In terms of service interconnectivity, it is easy to achieve business interconnectivity if the same SP provides services for different TN services, but if different TN application platforms are different, the same service of SP must be written in different programs.

Third, the application platform and service provision are managed in one domain, and each service provider provides services on its own application platform. Telecom operators are only responsible for user access and network control and bearer.

The third method can easily implement the communication problem between the same SP users in the telecom networks of different carriers, and facilitate the flexible development and development of services. However, in the third way, it is worth studying how telecom operators can find the most favorable position in the value chain ecosystem.

In addition, there is still a problem in the second and third modes: In the early stages of business and development, telecom operators can use their network advantages to develop certain game rules and take the initiative. However, with the development of these business models, operators must not only operate as bearer networks, but also consider other aspects of service provision. In this business model, the future control depends on who can become bigger and stronger, who can be closest to the user and control the user. Therefore, O & M and network management systems must be firmly in the hands of telecom operators and use the timely data and feedback of these users for analysis, coordination, and management.

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