Patent ID: 9258368
Filing Date: 2016-02-09
CPC Classification: H04L

Claim Text:
1. A method, comprising: establishing a control session by transmitting and receiving control session-related messages; transmitting restart information, by a policy-and-charging-rules-function network element, indicating a restart of the policy-and-charging-rules-function network element, wherein the restart information is transmitted by the policy-and-charging-rules-function network element to a policy-and-charging-enforcement-function network element or an application-function network element; when there is a reason for at least one protocol-related message of a first control session to be sent, the reason comprising a request for an IP connectivity access network session modification or a request for a user plane event, receiving, by the policy-and-charging-rules-function network element, the at least one protocol-related message of the first control session including session-related detail information; transmitting a restoration request message based on the session-related detail information; receiving at least one session parameter necessary for restoring the at least one first control session; and restoring the at least one first control session based on the received session-related detail information and the at least one session parameter.