Special Service Indication for GPRS CAMEL
Original Publication Date: 2003-Nov-25
Included in the Prior Art Database: 2003-Nov-25
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CAMEL-GPRS (Customized Applications for Mobile Network Enhanced Logic - General Packet Radio Service) interaction, firstly introduced in CAMEL Phase 3 (R99), enables the GPRS operator to apply online charging to the CAMEL subscriber. The charging can be done by the time connected or by the volume transferred. When a GPRS PDP (Packet Data Protocol) context is created, the information sent to the gsmSCF (global system for mobile communications Service Control Facility), which is mainly used for the charging, is the QoS (Quality of Service) parameter. However, there is no information on the specific service for which the end-consumer wants to use the PDP context. Depending on the service, the GGSN (Gateway GPRS Serving/Support Node) needs to handle the PDP context differently. For instance, in case of a VPN (Virtual Private Network) service, the contents need to be scrambled. Another example would be that for a multicast service multiple replies should be expected, and therefore a larger system load should be foreseen at the GGSN. Furthermore, the internet access is charged separately, post-paid or pre-paid, by the service provider. Hence, the user needs to open an account for the service provider in addition to the subscription to the GPRS network. No integrated solution exists so far. Therefore, it is proposed to add a new parameter, 'service-used-in-the-newly-initiated-PDP-context'. In case of a user-initiated PDP context, this parameter activates the Initial DP (Data Processing) GPRS, between the SGSN (Serving GPRS Support Node) and the gsmSCF, and the PDP Context Request (UE-SGSN). For a network-initiated PDP context, it updates the Initial DP GPRS (SGSN-gsmSCF) and the PDP Context Request (GGSN-SGSN). In both cases the parameter is treated as an optional parameter in order to provide backward compatibility. The charging mechanism at the gsmSCF is able to extract this service information from CAP (Computer Assisted Purchasing) Initial DP GPRS operation and uses it for the additional charging. By this method, the fee associated with the service provider can be collected by the GPRS network operator and later be transferred to the service provider (Figure 1).