Gr interface and Gs interface

The Gr interface exists between the SGSN and the HLR. While the Gs interface exists between the SGSN and the MSC/VLR. Both of those interfaces are based on the ‘SS7’ […]

(MS-SGSN-GGSN) GPRS Interfaces in 2G network

Here, we illustrate the GPRS interfaces between the MS, the SGSN, and the GGSN in 2G network in both ‘control plan’, and ‘data plan’. The ‘control plan’ is where the […]

(MS-SGSN-GGSN) GPRS Interfaces in 3G network

Here, we illustrate the GPRS interfaces between the MS, the SGSN, and the GGSN in 3G network in both ‘control plane’, and ‘data plane’. The ‘control plane’ is where the […]

PDP Context Deactivation Procedure

The MS, the SGSN, and the GGSN can initiate The ‘PDP context deactivation procedure’. PDP Context Deactivation Procedure (MS initiated) The MS sends ‘Deactivate PDP context request’ to the SGSN, […]

PDP Context Modification Procedure

In case one of any parameters associated with the PDP context changed, like the QoS as example. The node in which the PDP context is changed should initiate  ‘PDP Context […]

NSAPI and TI – PDP identifiers

NSAPI NSAPI refers to ‘Network layer Service Access Point Identifier’. The MS generates the NSAPI in the ‘PDP context activation’ procedure, And the MS sends it in the ‘Active PDP context […]

QoS ‘Quality of Service’ in GPRS

QoS refers to ‘Quality of Service’. After ‘PDP context activation’ procedure completes, a ‘PDP context’ shall exist on the MS, the SGSN, and the GGSN. In addition, the GGSN assigns […]

PDP type in GPRS

PDP type is the type of the IP address assigned to the PDP. PDP type maybe one of the following, IPv4. IPv6. IPv4v6 (Dual stack). The PDP type exists in subscription […]

PDP address in GPRS

As a result of the ‘PDP activation’ procedure, the GGSN assigns the ‘PDP context’ an IP address. The ‘PDP address’ is the IP of the ‘PDP context’. The ‘PDP address’ […]