The Process Supplementary Service request (PSSR) is a component of Unstructured Supplementary Service Data (USSD), a protocol used in mobile communication networks to transmit information between a mobile phone and an application program in the network. USSD is often used for querying information and for interactive services like mobile money services, menu-based information services, and mobile services settings.
The PSSR specifically is involved in the process of initiating a request for a supplementary service from the mobile device to the network. This could involve services like call forwarding, call waiting, or balance inquiries, among others. Here’s a breakdown of how PSSR fits into the USSD flow:
- Initiation of Request:
- The process begins when a user inputs a USSD code on their mobile device. These codes typically start with an asterisk (*), followed by digits that define the specific service requested, and end with a hash (#). For example, *123# might be a code to check the account balance.
- Transmission to the Network:
- Once entered, the USSD request is sent to the mobile network. The network then routes this request to the appropriate USSD gateway or application, based on the service code entered.
- Process Supplementary Service Request (PSSR):
- The PSSR is the message that is generated and sent within the network to request the execution of the specific supplementary service associated with the USSD code entered by the user. It contains details of the request that help the network understand what service is being asked for.
- Service Execution:
- The network processes the PSSR and executes the requested supplementary service. This could involve querying databases, interacting with other network services, or triggering specific network functionalities.
- Response to User:
- Once the requested service has been processed, a response is generated and sent back to the user’s device. This response is displayed on the device’s screen, providing the requested information or confirming the execution of a service action.
- Session Termination:
- USSD sessions are real-time and are usually closed as soon as the user receives the requested information or confirmation. Unlike SMS, USSD messages create a real-time connection which remains open, allowing a two-way exchange of a sequence of data. However, this session will automatically time out if there is no activity within a certain period.
USSD and the PSSR play a crucial role in providing quick and efficient access to various supplementary services without needing data connectivity, making it highly useful in regions with limited internet access or for users with basic mobile phones. This system’s real-time interaction capability also makes it ideal for services requiring immediate response, such as balance checks, making payments, or activating services directly from the mobile device.