Patent ID: 8144650

Claim:
A method of services request in a packet switched telecommunications network, said network comprising a Gateway GPRS Support Node (GGSN) arranged for communication with a Serving GPRS Support Node (SGSN), the method comprising: during activation of a subscriber session, receiving by said GGSN, from said SGSN in an Update PDP Context Request message, data comprising both 1) an Internet Protocol (IP) address and user plane tunnelling endpoint identifier (TEID) for a Radio Network Controller (RNC) and 2) an IP address and user plane TEID of said SGSN, said GGSN nominally utilizing the IP address and TEID of said RNC for said subscriber session; and, if an error indication is received by said GGSN indicating that said RNC has restarted, discarding said IP address and TEID corresponding to said RNC and utilizing said IP address and TEID corresponding to said SGSN, whereby said GGSN and SGSN can maintain said subscriber session in the event of an RNC restart.