Category: Session Management
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 […]
Session Management states in GPRS (2G and 3G)
For an MS to be able to send and receive data to and from the PDN, it must have an active PDP context. The ‘PDP context’ exist on the MS, […]
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’ […]
APN – what is it in a mobile network ?
APN refers to ‘Access Point Name’, and it is the logical name of the network, which the mobile network users connect to. The PS core network may connect to one […]
GTP tunnel and TEID
TEID refers to ‘Tunnel End Point Identifier’. After creating a PDP context between the MS and the GGSN, the data is sent transparently between the MS and the GGSN. In […]
Direct Tunneling in 3G
In order to reduce the load of passing the user plan data by the SGSN, the SGSN may decide to establish direct tunneling between the RNC and the GGSN. This […]