PS callpmm state and CM statethe MS shocould perform a GPRS attach to sgsn in order to get the right to access the GPRS services. after having executed the GPRS attach, The MS is in the PMM-CONNECTED state and mm contexts are established in the ms and the sgsn. the MS may active the PDP
Contexts. PDP a PDP context provides a packet connection to exchange IP packets between UE and the network side. The data packet connection can be used to access certain services. These services can be accessed through so-called access points. PDP context is one of the most important concepts in UMTS data architecture. A PDP context has a set of parameters, which are composed of all the information required for an end-to-end connection:-PDP type-PDP address type-requested QoS profile (user requested) -The negotiated QoS profile (after negotiation with the network side)-authentication type (PAP or chap)-DNS type (dynamic or static DNS) the PDP context is generally set for two purposes of the terminal. The PDP context is designed to assign a PDP address, IPv4 address or IPv6 address to a terminal. The second is used to determine a logical connection with a QoS profile to the terminal, that is, a set of QoS profiles that can be executed throughout the UMTS network for a PDP context negotiation.
T3380 (30 s) CS-CALL PS-CALL
