Method, apparatus and program product for merging communication sessions in an IMS

1. A method, comprising:

controlling, with a merging entity having at least one microprocessor, communication of a first user and a second user, the communication comprising a first session and a second session;

determining, with the merging entity, if communication service identifiers, comprising an internet protocol multimedia subsystem (IMS) communication service identifier, are indicated for the first session and for the second session, the IMS communication service identifiers identifying a type of communication service in use by the first session and the second session;

determining whether communication service identifiers indicated for the first session and for the second session are the same IMS communication service identifier; and

merging the first session and the second session into an existing session between the first user and the second user based on determining that the communication service identifiers for the first session and the second session are the same,

wherein the merging entity is implemented in a user equipment of the first user or the second user.

2. The method of claim 1 , further comprising using session initiation protocol to control the communication of the first user and the second user.

3. The method of claim 1 , wherein the first session comprises a first media type different from a second media type of the second session.

4. The method of claim 1 , further comprising:

determining, during establishment of the second session, existence of an ongoing session between the first user and the second user; and

merging the second session into the ongoing session.

5. The method of claim 4 , wherein merging the second session into the ongoing session comprises re-negotiating the ongoing session.

6. The device of claim 5 , wherein re-negotiating the ongoing session comprises transmitting a re-INVITE or an UPDATE request of session initiation protocol.

7. The method of claim 1 , wherein the existing IMS session between the first user and the second user comprises an ongoing session having media of the first session and the merging adds media of second session into the ongoing session.

8. The method of claim 1 , wherein the IMS communication service identifier comprises an IMS Application Reference Identifier (IARI).

9. The method of claim 1 , wherein the IMS communication service identifier comprises an IMS Communication Service Identifier (ICSI).

10. The method of claim 9 , further comprising determining that the IMS communication service identifier indicates IMS Multimedia Telephony Service (MMtel).

11. The method of claim 1 , wherein IMS communication service identifier comprises an Open Mobile Alliance (OMA) feature tag.

12. The method of claim 1 , wherein merging the first session and the second session into an existing IMS session between the first user and the second user comprises implementing logic at user equipment of one of the first user and the second user to represent the merged sessions as a single application.

13. A device comprising:

a merging entity having at least one microprocessor, configured to control communication between a first user equipment and a second user equipment via a wireless network, the communication comprising a first session and a second session; and

the merging entity comprising at least one processor, the at least one processor operable to

determine if communication service identifiers comprising an internet protocol multimedia subsystem (IMS) communication service identifier are indicated for the first session and for the second session, the IMS communication service identifiers identifying a type of communication service in use by the first session and the second session,

determine whether communication service identifiers indicated for the first session and for the second session are the same IMS communication service identifier, and

merge the first session and the second session into an existing IMS session between the first user equipment and the second user equipment based on determining that the IMS communication service identifiers for the first session and the second session are the same IMS communication service identifier,

wherein the merging entity is implemented in a user equipment of the first user or the second user.

14. The device of claim 13 , wherein the at least one processor is further configured to control the communication between the first user equipment and the second user equipment using session initiation protocol.

15. The device of claim 13 , wherein the first session comprises a first media type different from a second media type of the second session.

16. The device of claim 13 , wherein the at least one processor is further configured to:

determine, during establishment of the second session, existence of an ongoing session between the first user equipment and the second user equipment; and

merge the second session into the ongoing IMS session.

17. The device of claim 16 , wherein the at least one processor is further configured to re-negotiate the ongoing session to merge the first session into the ongoing session.

18. The device of claim 17 , wherein re-negotiating the ongoing session comprises transmitting a re-INVITE or an UPDATE request of session initiation protocol.

19. The device of claim 13 , wherein the existing IMS session between the first user equipment and the second user equipment comprises an ongoing session having media of the first session and the merging adds media of second session into the ongoing session.

20. The device of claim 13 , wherein the communication further comprises at least one additional session, and

wherein the at least one processor is further configured to merge the at least one additional session into the existing IMS session.

21. The device of claim 13 , wherein the IMS communication service identifier comprises one of an IMS Communication Service Identifier (ICSI), an Open Mobile Alliance (OMA) feature tag and an IMS Application Reference Identifier (IARI).

22. The device of claim 13 , wherein the IMS communication service identifier is an IMS Communication Service Identifier (ICSI), and the at least one processor is further operable to:

determine that the IMS Communication Service Identifier indicates IMS Multimedia Telephony service (MMtel).

23. The device of claim 13 , wherein the merging entity comprises a terminal device of one of the first user equipment and the second user equipment and wherein the merging the first session and the second session into the existing IMS session between the first user equipment and the second user equipment comprises representing the merged sessions as a single application.