| 摘要 |
A method for restoring connectivity between a node in an IP Multimedia Subsystem, IMS, network, and a User Equipment, UE. The UE is associated with a Proxy Call Session Control Function node, P-CSCF, of said IMS network, and with at least one control node of a packet access network, through which the UE connects to the IMS network. The method allows for restoring the connectivity of the UE to an IMS network node after said IMS node has failed to establish a communication to said UE via said P-CSCF node. |
| 主权项 |
1. A method for restoring connectivity between an IMS node in an IP Multimedia Subsystem, IMS, network, and a User Equipment, UE, the UE being associated with a Proxy Call Session Control Function node, P-CSCF, of said IMS network, the UE further being associated with at least one control node of a packet access network that is used by the UE to connect to said IMS network, wherein said IMS node has failed to establish a communication to said UE via said P-CSCF node, said method comprising:
at said IMS node, sending a first DIAMETER request to a Home Subscription Server, HSS, node, requesting the UE to reset a connection to said packet access network associated with the UE, wherein the first request indicates a new registration of the UE is required; at said HSS node, receiving said first DIAMETER request from said IMS node, providing an identity of said UE, looking up an address of the at least one control node to which said UE is associated in said packet access network, and sending a second request to said at least one control node, requesting the UE to reset the connection to said packet access network, wherein the second request indicates that re-attachment of the UE is required; and at said at least one control node, receiving said second request from said HSS node, and sending a third request to said UE, requesting said UE to reset the connection to said packet access network, said reset comprising registration to an available P-CSCF node of said IMS network. |
