GPRS Attach Call Flow, GPRS Call Flow, PDP attach sequence, PDP context activation
GPRS Attach Call Flow, GPRS Call Flow, PDP attach sequence, PDP context activation I will be covering sequence of events involved in a GPRS terminal attaching to a network and in PDP context activation. We can also call it as GPRS/Data location update and PDP context activation procedure. GSM entities involved : • GSM coverage (CELL) • BSS (BSC) • Core Network (SGSN, DNS server, MSC VLR) • GGSN site (GGSN, Radius Server, DHCP server) • GSM Database (EIR, HLR) When GPRS enabled MS is switched ON it initiates a GPRS attach request procedure. GPRS attach request contain old TMSI ( Temporary Mobile Subscriber Identity),Mobile Network Identity(MCC+MNC),location area code ( LAC),Routing area code ( RAC) information. The SGSN (Serving GPRS Support Node) searches for TMSI in its database. No entry is found for the TMSI, so the SGSN uses the old location area information to identify the old SGSN where this terminal was being served. The old SGSN responds with the GPRS m