CSD-Based WAP Networking Solution

For bearer networks, WAP networking methods include short message (SMS), Circuit Switching Data (CSD), and the upcoming general grouping wireless service (GPRS. This article describes several major CSD-based networking solutions and system components.

I. Composition of the WAP Gateway System
A WAP gateway system may consist of the following functional entities: WAP Gateway, firewall, access server, DNS server, various applications (WML/WWW, FTP, e-mail, etc.) server. The Access Server may include AAA service, DHCP, billing data generation, and other functional modules. The AAA service and billing information generation functions can also be implemented by the WAP Gateway. The specific system structure is shown in Figure 1. The Access Server, DNS server, and various application servers should be configured as needed.

Ii. Circuit Switching
(CSD) WAP Business Networking Solution
(1) Build a WAP service network using a mobile network and set up a WAP Gateway in a centralized manner
1. Access Server Settings
Connect the Access Server to the gmsc of the GSM network in the local network. ISUP is used for interface signaling between the Access Server and gmsc. The Access Server is connected to the Backbone Node of the IP network. If there is no Backbone Node of the local IP network, you can access the nearest node of the IP network. Figure 2 shows the connection between the GSM network and the Access Server in this case.
2. Network Structure of the WAP Service
The location of the WAP Gateway can be the same or different from that of the Access Server. Figure 3 shows the WAP network structure diagram of solution 1. The WAP Gateway System in the figure includes the WAP Gateway and access, WAP content service, and other functional modules. The specific composition is shown in figure 3. In the figure, the local access system only draws the Access Server and router. In actual networking, it may also include AAA, DHCP, various Internet applications (WWW, e-mail, FTP, etc) server and other functional modules.
3. User Access Method
A local mobile user calls a special service number to access the access server where the user is located, and sends the personal user information (that is, the caller number) to the access server.
For ease of use, the access authentication of the WAP Service adopts the public user name and password method. For example, the user name is "WAP" and the password is "WAP". At the same time, after a user passes authentication on the Access Server, the user's personal information must be entered to enter the specified portal site. The user's personal information is recommended to be the user's name number.
When you want to access other website information, you must use the specified portal site for link.
(2) Build a WAP service network using a mobile network and configure the WAP Gateway Distribution
1. Network Organization
The local access server is connected to the gmsc in the local GSM network.
(3) Establish a WAP service network in cooperation with existing ISPs and set up a WAP Gateway in a centralized manner
Mobile operators can cooperate with existing ISPs (ISP with high network coverage should be selected as much as possible) to form a WAP business network. Cooperation with existing ISPs refers to local access to the WAP service network through access servers of other ISPs.
1. Network Structure
Work with existing ISPs to directly connect the WAP Gateway (including various WAP gateways, WAP application servers, and firewalls) to the Access Server System of the local ISP. Other networks do not need to be modified. Its network structure is 7. WAP users can connect to the Internet through local access systems distributed nationwide by the partner ISP and log on to their own WAP Gateway.
2. Access Code
A local mobile user calls a special service number to access the access server where the user is located, and sends the personal user information (that is, the caller number) to the access server.
When a roaming mobile user calls a special service number, he only needs to access the access server of the visiting location, and then enters the IP network through the home gateway.
3. Authentication
In solution 2, as it is necessary to cooperate with existing ISPs, for WAP users, apart from the authentication required for the terminal to access the GSM network on the HLR, you also need to perform authentication on the ISP's access server. The authentication method and Protocol are the same as the normal users of the ISP.

Comparison of Three Solutions
Solution 1 is connected to the existing Internet, so it can carry out common Internet access services and WAP services at the same time, and is also conducive to rapidly enriching the information content of the WAP Service Network to develop various new services. In addition, because the Access System and WAP applications are set by mobile operators, management, billing, and settlement are relatively simple and flexible. You only need to pay for the mobile phone bill to use the WAP service. This solution applies to the centralized management mode.
The WAP Gateway distribution settings in solution 2 allow you to directly access the Internet through the local gateway. However, the investment is large and the management is complicated. This solution is suitable for scattered management modes and is suitable for opening businesses related to user data, such as user customization.
Solution 3 has simple networking and low investment, but needs to cooperate with other ISPs, that is, the ISP access server needs to identify the WAP access code. At the same time, when using the WAP Service, the user must not only pay the mobile phone bill, but also pay the ISP access fee.