Cisco Cisco ASR 5000
Network Requested Secondary PDP Context Activation
How It Works ▀
SGSN Administration Guide, StarOS Release 18 ▄
How It Works
Gn/Gp SGSN
During PDP Context Activation Procedure the Bearer Control Mode (BSM) is negotiated. BCM is applicable to all PDP
Contexts within the activated PDP Address/APN pair. It is either “MS_only” or “MS/NW”.
Contexts within the activated PDP Address/APN pair. It is either “MS_only” or “MS/NW”.
For “MS/NW” both the MS and the GGSN may request the creation of additional PDP contexts for the PDP
Address/APN pair. The MS uses the Secondary PDP Context Activation Procedure, whereas the GGSN uses NRSPCA.
When BCM is “MS_only”, the GGSN does not initiate NRSPCA.
Address/APN pair. The MS uses the Secondary PDP Context Activation Procedure, whereas the GGSN uses NRSPCA.
When BCM is “MS_only”, the GGSN does not initiate NRSPCA.
The MS indicates support of Network Requested Bearer control through the Network Request Support UE (NRSU)
parameter. Using the PCO IE during Primary PDP context Activation, NRSU is applicable to all PDP contexts within
the same PDP address/APN pair. The SGSN indicates support of the Network Requested Bearer control to the GGSN
through the Network Request Support Network (NRSN) parameter in common flags of the Created PDP Context
Request during PDP activation.
parameter. Using the PCO IE during Primary PDP context Activation, NRSU is applicable to all PDP contexts within
the same PDP address/APN pair. The SGSN indicates support of the Network Requested Bearer control to the GGSN
through the Network Request Support Network (NRSN) parameter in common flags of the Created PDP Context
Request during PDP activation.
During a new SGSN RAU, the new SGSN indicates the support by means of the NRSN parameter in Update PDP
Context Request. If common flags are not included in the Update PDP Context Request message, or the SGSN does not
indicate support of the Network Requested Bearer control (NRSN flag is not set), the GGSN, following a SGSN-
Initiated PDP Context Modification (triggered by SGSN change), performs a GGSN-Initiated PDP Context
Modification to change the BCM to “MS-Only” for all PDP-Address/APN-pairs for which the current BCM is
“MS/NW”.
Context Request. If common flags are not included in the Update PDP Context Request message, or the SGSN does not
indicate support of the Network Requested Bearer control (NRSN flag is not set), the GGSN, following a SGSN-
Initiated PDP Context Modification (triggered by SGSN change), performs a GGSN-Initiated PDP Context
Modification to change the BCM to “MS-Only” for all PDP-Address/APN-pairs for which the current BCM is
“MS/NW”.
When BCM is “MS/NW”, the GGSN may trigger activation of secondary PDP context based on local configuration or
on PCRF/PCEF direction.
on PCRF/PCEF direction.
Successful Activation for Gn/Gp SGSN
The call flow below illustrates the NRSPCA procedure for a successful activation.