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’ protocol. Those interfaces doesn’t pass user plane data. They only…

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, including the TI of the PDP. There is an information…

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 request’ sent to the SGSN. After the ‘PDP context activation’…

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 information that exists in the HLR for every MS. The…

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’ may be ‘Dynamic’, or ‘Static’ . Dynamic PDP address The…