Telefonaktiebolaget Lm Ericsson (Publ)

Francisca Bejarano Garcia

Emiliano Merino Vazquez

Ingo Berk

Tobias Austrell

David Heras Cano

A method for assigning to a terminal device (UE) a service server (SS) carried out by an IS, by any of the SSs, and by the UDB in a cooperative/corresponding manner. A 'first reallocation (IS/SS/UDB) procedure' and a 'second reallocation (IS/SS/UDB) procedure' are correspondingly performed within the IS, the SS and the UDB. The first reallocation procedure allows, via IS/SS/UDB processing and interactions, storing by the UDB, in relationship with at least one of the user identifiers of a UE, a mark indicating that the UE has been assigned to a replacement SS to substitute another SS that has failed. The second reallocation procedure allows, also via IS/SS/UDB processing and interactions, utilization of the mark to trigger a new SS reallocation of the UE to a SS when the UE sends a subsequent registration message.

Methods and apparatuses for assigning to a terminal device a service server in a telecommunications system

Method and apparatus for an I-CSCF to assign to a user equipment a S-CSCF server in an IMS system

A Serving Call Session Control Function, S-CSCF, within an IP Multimedia Subsystem, IMS, core network. Notifications are sent to a Home Subscriber Server, HSS, of the IMS core network, indicating IMS registration state changes of users. Delivery failure of a notification of an IMS registration state change sent to a HSS and relating to a given user is detected. An association between an identifier of the given user and an indication of said delivery failure is stored in order to indicate a loss of IMS registration state synchronization for the given user between the S-CSCF and the HSS. An event requiring an IMS registration state change for the user is detected. A determination is made that a delivery failure indication associated with the user's identifier is stored. The HSS is notified indicating the required IMS registration state change and of a previous loss of the IMS registration state synchronization.

Growing community of inventors

Madrid, Spain

Francisca Bejarano Garcia