The call flow of Data Service

There are many telecommunication services can be optimized by Telecommunication Company to gain as much as revenue instead of traditional service (voice call and SMS) and one of them is Data Service e.g. mobile broadband internet service. Data Service could be internet access e.g. mobile broadband internet service through wireless network or Value Added Services (VAS) which utilized Data Service platform e.g. a service based on BREW and WAP platform. The term of Data Service is usually associated with wireless or mobile broadband internet services which include CDMA 1x 2000, GPRS, EVDO or 3G services.

To make Data Service happens, Telecommunication Company need to insert new network infrastructures to the existing network e.g. Public Data Service Node (PDSN), SGSN/GGSN and charging system to charge the subscribers while they access to internet. How the call flow of Data Service is happening from subscribers until they reach internet access on their mobile phone or computer/laptop. Herewith the network infrastructures which involved on the call flow of Data Service. In this scenario, it was deploying on the CDMA network

1. mobile phone, computer/laptop or modem
2. Base Transceiver Station (BTS)
3. Base Station Controller (BSC)
4. Mobile Switching Centre (MSC)
5. Home Local Register/Visitor Local Register (HLR/VLR)
6. Public Data Service Node (PDSN)
7. Intelligent Network (IN)
8. Authentication, Accounting and Authorization (AAA) or Charging System
9. Firewall
10. Bandwidth to internet gateway

The call flow of Data Service e.g mobile broadband internet service is just like voice call flow. The different is type of service which be retrieved by subscribers. Therefore, Data Service call flow will be routed to the network infrastructures where voice call served and then route to Data Service’s networks element to have internet service.

First step, subscribers will make a session through the mobile phone (WAP application) or computer/laptop that connects to modem. If voice call session starts the process by dialing to the destination, Data Service started by dialing to certainty number for example #777 so then MSC will identify that it is Data Service process. The next step, call flow will land on BTS, BSC, MSC and HLR/VLR. Once MSC noticed that it is a Data Service call, MSC will forward the request to PDSN. PDSN will assign a certainty IP Pool once the session was authenticated. PDSN also will forward the request to Accounting server or charging system to assign a tariff.

AAA server or charging system will assign certainty tariff once they noticed that the phone number used by subscribers to make a Data Service is a valid number. Finally, PDSN will request internet traffic and then forward back to the subscribers. In this section, subscriber will be able to browse to internet. Firewall was installed to protect internal network keep secure

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