The SGSN supports Secondary PDP context activation by the network - NRSPCA.
- Network Requested PDP Context Activation (NRPCA) is supported by SGSN but only for 3G access
- Network Requested Secondary PDP Context Activation (NRSPCA) is now supported by both Gn/Gp and S4 type SGSNs.
P-GW supports only the NRSPCA procedure. Network requested bearer control, uesed by P-GW and the SGSN, makes use of the NRSPCA procedure.
NRSPCA allows the network to initiate secondary PDP context activation if the network determines that the service requested by the user requires activation of an additional secondary PDP context.
Network requested bearer control functionality is mandatory in EPC networks, requiring use of NRSPCA. With this feature S4-SGSN now supports network requested bearer control.
Relationships to Other Features
For NRSPCA on Gn/Gp SGSN, the sgtp-service configuration must include common IE flags in GTP messages.
Network requested activation must be enabled in the call-control profile.
NRSPCA must be supported on the GGSN used for the PDP session. SGSN indicates support of NRSPCA by setting the NRSN flag in the common flags IE of the Create PDP Context Request and the Update PDP Context Request/Response messages to GGSN.
For S4-SGSN, network requested activation must be enabled in the call-control profile.