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SGSN/gprsSSF Subscriber attaches
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gsmSCF CAMEL service (scenario 1) is started CAMEL service is terminated CAMEL service (scenario 2) is started for PDPc #1 CAMEL service remains active CAMEL service (scenario 2) is started for PDPc #2 CAMEL service remains active
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Initial DP GPRS Furnish charging information GPRS Continue GPRS Initial DP GPRS Request report GPRS event Continue GPRS Initial DP GPRS Request report GPRS event Continue GPRS
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The scenario 1 CAMEL service instance in Figure 544 does not arm any events or request charging reports As a result, the scenario 1 CAMEL service terminates when it sends CUE-GPRS The purpose of this scenario 1 service may be, for example, access control For that service, it is not necessary for the CAMEL service to remain active after attachment After the scenario 1 CAMEL service instance has terminated, the subscriber is attached and may establish PDP contexts When the subscriber establishes a PDP context, there is no scenario 1 service instance active for this subscriber (any more) Hence, the SGSN may check GPRS-CSI to determine whether a scenario 2 service instance may be invoked for this PDP context If GPRS-CSI contains TDP PDP context establishment, then a scenario 2 CAMEL service instance is invoked for this PDP context If a second PDP context is established, another scenario 2 service instance may be invoked The scenario 2 service instances use a different TDP de nition in GPRS-CSI than the scenario 1 service instance; hence different gsmSCF addresses may be used for the scenario service instance and the scenario 2 service instances The scenario 2 service instances may therefore run on a different SCP than the scenario 1 service instance The rules for reporting a PDP context related event to a scenario 1 or to a scenario 2 service are as follows: IF scenario 1 service active for this subscriber THEN IF event armed as EDP THEN report event as EDP to scenario 1 service; ELSE IF scenario 2 service active for this PDP context of this subscriber THEN IF event armed as EDP THEN report event as EDP to scenario 2 service; ELSE IF event contained in GPRS-CSI THEN invoke scenario 2 service logic instance 5334 gprsSSF and CAMEL Dialogue Rules The dialogue rules for the CAMEL dialogue between gprsSSF and gsmSCF are similar to the dialogue rules that apply for the CAMEL call control One exception to this is the TCAP segmentation, which is explained in Section 5335 gprsSSF Finite State Machine The gprsSSF is instantiated when a CAMEL service is invoked The gprsSSF contains a FSM The state of the gprsSSF FSM is determined by events that take place in the SGSN and by the signalling
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PDPc state model (1) PDPc state model (2) PDPc state model (3) GPRS session state model gprsSSF FSM Scenario 1 service logic
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between gsmSCF and gprsSSF The state of the gprsSSF FSM indicates the type of control that the gsmSCF may assert on the state models that are under control by this gprsSSF This is re ected in Figures 545 and 546 In the example in Figure 545, one gprsSSF FSM is controlling multiple state models: one GPRS session state model and multiple PDP context state models In the example in Figure 546, each gprsSSF FSM is controlling exactly one PDP context state model Table 520 lists the permissible gprsSSF FSM states Figure 547 represents how the gprsSSF FSM may transit between the permissible states CAMEL Relationship The CAMEL dialogue between gsmSCF and gprsSSF is described by means of the type of CAMEL relationship it represents As long as the CAMEL dialogue between gsmSCF and gprsSSF is active, there exist one or more relationships For CS call control, a CAMEL dialogue has exactly one
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Table 520 gprsSSF FSM states Description The gprsSSF is currently not invoked The gprsSSF is invoked and is waiting for the initial service event (eg PDP context establishment) The gprsSSF has established a relationship with the gsmSCF and is waiting for instructions from the gsmSCF The gprsSSF is active and is monitoring a GPRS session or PDP context There is a relationship with the gsmSCF