Telefonaktiebolaget Lm Ericsson (publ)

Optis Wireless Technology, LLC

Anders Ryde

Stephen Terrill

Mats Ola Stille

Bo Åström

Bror Lennart Norell

Ralf Keller

Hubert Przybysz

Christer Boberg

Steinar J Dahlin

Stefan Berg

Afshin Abtin

Patrik Dannebro

Håkan Österlund

Jesus-Javier Arauz-Rosado

Bo Aström

Mattias Dahlqvist

Clary Hallberg Dahlin, Legal Representative

Steinar Dahlin

Lennart Norell

A method performed by a first IP multimedia system, IMS, node (), for handling a network function in a communication network. The first IMS node () requests a first core network node () for at least a part of contact information of a network function instance, and receives a response from the first core network node () with at least the part of the contact information for the network function instance. The first IMS node () communicates with a second IMS node () or a core network node over a service based interface, based on the received part of the contact information for the network function instance.

First IMS node, first core network node, second IMS node, and methods performed therein

The present disclosure generally relates to aspects of applying policy and charging rules to bearers in a communication network. The policy and charging rules are provided for application to at least a dedicated bearer. The technique presented herein may be implemented in connection with a mobile terminal moving between an access point of a first type supporting default and dedicated bearers and an access point of a second type supporting default and not supporting dedicated bearers. A method embodiment of the present disclosure removes an established dedicated bearer and temporarily suspends application of the rules to the dedicated bearer upon a move from an access point of the first type to an access point of the second type. A network endpoint of an ongoing session kept agnostic of the removal of the dedicated bearer. Upon a move from the access point of the second type to an access point of the first type, the dedicated bearer is re-established and the rules are re-applied to the re-established dedicated bearer.

Technique for applying policy and charging rules to bearers

The present invention relates to a method and an arrangement for allowing private domains in the IMS, which makes it possible to use a SIP URI like ID@private-domain.TLD. This is achieved by providing an administration support and an interface to the IMS interconnect DNS and the DNS system of the operator network. The identity associated with private domain is established as a Private domain name based IMPU. The private domain name based IMPU and the Operator domain name based IMPU is associated by using the implicit registered identity set provided by the IMS.

Method and arrangement for allowing enterprise and personal domains in the IMS

A method and apparatus for handling a Session Initiation Protocol (SIP) OPTIONS capability query message in a communication network. A SIP proxy node receives a SIP OPTIONS message from a querying node. It sends the message to a plurality of devices, and receives a response from at least two of the plurality of devices. Each response includes an identity of the responding device and an indication of the capabilities of the responding device. Each received response is stored in a memory, and a reply message is generated. The reply message includes the identities and capabilities of all of the responding devices. This reply message is then sent to the querying node. This allows the querying node to receive capability information relating to all of the callee's devices rather than just the one that responds first.

Capability query handling in a communication network

A method of indicating the IP Multimedia Subsystem communication service(s) to which a Session Initiation Protocol message relates, the method comprising including one or more communication service identifier(s) in the Session Initiation Protocol message as a Feature Tag of the message.

Method and apparatus for identifying an IMS service

A method of indicating IP Multimedia Subsystem (IMS) services and IMS applications to which a Session Initiation Protocol (SIP) message relates. An IMS communication service identifier and an IMS application reference are added to the SIP message. The identifier and the reference may be added as Feature Tags. The reference may also be added as an a-line augmenting an m-line in a Session Description Protocol (SDP) part of the SIP message.

A User Equipment (UE) and IP Multimedia Subsystem (IMS) network node for indicating the IMS services and IMS applications to which a Session Initiation Protocol (SIP) message relates. An IMS communication service identifier and an IMS application reference are added to the SIP message. The identifier and the reference may be added as Feature Tags. The reference may also be added as an a-line augmenting an m-line in a Session Description Protocol (SDP) part of the SIP message.

A method, application server, and Serving Call/Session Control Function (S-CSCF) for allocating a SIP Application Server to a subscriber in an IP Multimedia Subsystem. A Home Subscriber Server (HSS) identifies for the subscriber, a set of provisioned initial filter criteria, which contains at least one generic SIP Application Server identity. The HSS sends the filter criteria to an S-CSCF allocated to the subscriber. The S-CSCF resolves the generic SIP Application Server identity into a plurality of application server addresses, with one of the addresses being allocated to the subscriber for use in provisioning a service to the subscriber. The S-CSCF caches the address allocated to the subscriber for subsequent use.

Method and apparatus for allocating application servers in an IMS

An apparatus and method for indicating the IP Multimedia Subsystem (IMS) services to which a Session Initiation Protocol (SIP) message relates. One or more communication service identifiers are added to the SIP message as a Feature Tag.

The present invention relates to a method and an arrangement for allowing private domains in the IMS, which makes it possible to use a SIP URI like ID@private-domain.TLD. This is achieved by providing an administration support and an interface to the IMS interconnect DNS and the DNS system of the operator network. The identity associated with private domain is established as a Private domain name based IMPU.

Method and arrangement in an internet protocol multimedia subsystem

A method of distributing application server addresses in an IP Multimedia Subsystem. Upon allocation of an application server to a subscriber, the allocated or another application server sends at least one application server address to a Home Subscriber Server (HSS). The HSS stores the address(es) in association with the subscriber identity and sends the address(es) to a Serving Call/Session State Control Function (S-CSCF) allocated to the subscriber. The S-CSCF caches the address(es) in association with the subscriber identity and uses the address(es) to send subscriber-related messages to the allocated application server.

Growing community of inventors

Saltsjöbaden, Sweden

Anders Ryde