Cisco Cisco ASR 5000
Serving GPRS Support Node (SGSN) Overview
Features and Functionality ▀
SGSN Administration Guide, StarOS Release 18 ▄
CAMEL Service Phase 3, Ge Interface
The SGSN provides PDP session support as defined by Customized Applications for Mobile network Enhanced Logic
(CAMEL) phase 3.
(CAMEL) phase 3.
CAMEL Service
CAMEL service enables operators of 2.5G/3G networks to provide operator-specific services (such as prepaid GPRS
service and prepaid SMS service) to subscribers, even when the subscribers are roaming outside their HPLMN.
service and prepaid SMS service) to subscribers, even when the subscribers are roaming outside their HPLMN.
CAMEL Support
SGSN support for CAMEL phase 3 services expands with each SGSN application release. Current support enables
operators of 2.5G/3G networks to provide operator-specific services (such as prepaid GPRS service and prepaid SMS
service) to subscribers, even when the subscribers are roaming outside their HPLMN.
operators of 2.5G/3G networks to provide operator-specific services (such as prepaid GPRS service and prepaid SMS
service) to subscribers, even when the subscribers are roaming outside their HPLMN.
For this release the SGSN has expanded its support for CAMEL Scenario 1 adding:
Implementation of Scenario1 triggers (TDP-Attach, TDP-Attach-ChangeofPosition)
Implementation of Scenario1 Dynamic triggers (DP-Detach, DP-ChangeofPosition)
Expanded conformance to 3GPP spec 23.078 (Release 4)
The SGSN supports the following GPRS-related functionality in CAMEL phase 3:
Control of GPRS PDP contexts
Functional support for CAMEL interaction includes:
PDP Context procedures per 3GPP TS 29.002
GPRS TDP (trigger detection point) functions
Default handling codes, if no response received from SCP
GPRS EDP (event detection points) associated with SCP
Charging Procedures: Handle Apply Charging GPRS & Handle Apply Charging Report GPRS
“GPRS Dialogue scenario 2" for CAMEL control with SCP
CAMEL-related data items in an S-CDR:
SCF Address
Service Key
Default Transaction Handling
Level of CAMEL service (phase 3)
Session Recovery for all calls have an ESTABLISHED CAMEL association.
Ge Interface
The SGSN’s implementation of CAMEL uses standard CAP protocol over a Ge interface between the SGSN and the
SCP. This interface can be deployed over SS7 or SIGTAN.
SCP. This interface can be deployed over SS7 or SIGTAN.