METHOD AND SYSTEM OF USING IP MULTIMEDIA SYSTEM FOR CALL SETUP IN MOBILE SATELLITE SYSTEMS

• US 20100054177A1
• Filed: 01/14/2009
• Published: 03/04/2010
• Est. Priority Date: 09/02/2008
• Status: Abandoned Application

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Narayanaswamy, Kasi, Sahin, Serdar
• Application Number:
  US12/353,369
• Publication Number:
  US 20100054177A1
• Time in Patent Office: Days
• US Class Current: 370/316
• CPC Class Codes: H04B 7/18582 Arrangements for data linking, i.e. for data framing, for error recovery, for multiple access
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/102 Gateways arrangements for connecting between networks having differing types of switching systems, e.g. gateways, H04L12/66
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1095 Inter-network session transfer or sharing
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04W 76/12 Setup of transport tunnels
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections
• CPC Class Codes: H04W 84/06 Airborne or Satellite Networks space-based or airborne stations H04B7/185

Abstract

A system and method of using IP Multimedia System (IMS) for call setup in Mobile Satellite Systems. The method begins by a unit equipment (UE) originating a call to a second party. Next, secondary Packet Data Protocol (PDP) Context is initiated after originating the call. At least a portion of progress and acknowledgement message exchanges are handled by a Satellite Session Initiation Protocol Gateway (SSGW) in a Mobile Satellite System (MSS) on behalf of the UE without communicating with the UE. The call is then connected between the UE and the second party. A simplified Session Description Protocol (SDP) may be implemented for use between the UE and the SSGW to reduce the payload of Session Initiation Protocol (SIP) messaging. With a simplified SDP, one codec of the second party may be pre-provisioned in the SSGW.

Claims

1. A method of using IP Multimedia System for call setup in Mobile Satellite Systems, the method comprising the steps of:

originating a call by a unit equipment (UE) to a second party;

initiating Secondary Packet Date Protocol (PDP) Context after originating the call;

handling at least a portion of progress and acknowledgement message exchanges by a Satellite Session Initiation Protocol Gateway (SSGW) in a Mobile Satellite System (MSS) on behalf of the UE; and

connecting the call between the UE and the second party.

2. The method according to claim 1 wherein the step of originating a call by a UE includes sending an INVITE message by the UE to the SSGW.

3. The method according to claim 2 wherein the Secondary PDP Context is activated immediately after the UE sends the INVITE message.

4. The method according to claim 1 wherein the step of handling at least a portion of progress and acknowledgement messages includes handling the message exchanges without communicating with the UE.

5. The method according to claim 4 wherein the step of handling at least a portion of progress and acknowledgement message exchanges includes handling 1xx session progress message exchanges by the SSGW on behalf of the UE.

6. The method according to claim 5 wherein the 1XX session progress message exchanges are 183 Session Progress message exchanges.

7. The method according to claim 5 wherein the step of handling at least a portion of progress and acknowledge message exchanges includes handling PRACK message exchanges by the SSGW on behalf of the UE.

8. The method according to claim 1 further comprising the step of sending an UPDATE message by the UE to inform the second party of completion of resource reservation.

9. The method according to claim 1 further comprising the step of sending an OK (UPDATE) message by the SSGW to the UE acknowledging receipt of a ring message.

10. The method according to claim 9 further comprising the step of sending an acknowledgement message by the SSGW acknowledging receipt of the ring message on behalf of the UE.

11. The method according to claim 1 wherein the SSGW withholds sending a first Session Description Protocol answer message to the UE.

12. The method according to claim 1 further comprising the step of implementing a simplified Session Description Protocol (SDP) during message exchanges between the UE and the SSGW.

13. The method according to claim 12 wherein the step of implementing a simplified SDP includes using only one codec for the second party.

14. The method according to claim 13 wherein the codec is pre-provisioned by the SSGW as part of the second party configuration.

15. A system for using IP Multimedia System for call setup in Mobile Satellite Systems, the system comprising:

a unit equipment (UE) originating a call to a second party;

means for initiating Secondary Packet Date Protocol (PDP) Context after originating the call by the UE;

a Satellite Session Initiation Protocol Gateway (SSGW) in a Mobile Satellite System (MSS) for handling at least a portion of progress and acknowledgement message exchanges on behalf of the UE; and

means for connecting the call between the UE and the second party.

16. The system according to claim 15 wherein the UE originates the call by sending an INVITE message to the SSGW.

17. The system according to claim 16 wherein the Secondary PDP Context is activated immediately after the UE sends the INVITE message.

18. The system according to claim 15 wherein the SSGW handles at least a portion of progress and acknowledgement messages without communicating with the UE.

19. The system according to claim 18 wherein the progress and acknowledgement message exchanges includes 1XX session progress message exchanges.

20. The system according to claim 19 wherein the 1XX session progress message exchanges are 183 Session Progress message exchanges.

21. The system according to claim 19 wherein the acknowledge message exchanges includes PRACK message exchanges.

22. The system according to claim 15 wherein the UE sends an UPDATE message to inform the second party of completion of resource reservation.

23. The system according to claim 15 wherein the SSGW sends an OK (UPDATE) message to the UE acknowledging receipt of a ring message.

24. The system according to claim 15 wherein the SSGW withholds sending a first Session Description Protocol answer message to the UE.

25. The system according to claim 15 wherein a simplified Session Description Protocol (SDP) is used during message exchanges between the UE and the SSGW.

26. The system according to claim 25 wherein the simplified SDP includes using only one codec for the second party.

27. The system according to claim 26 wherein the codec is pre-provisioned by the SSGW as part of the second party configuration.

28. A node for using IP Multimedia System for call setup in Mobile Satellite Systems, the node comprising:

means for handling at least a portion of progress and acknowledgement message exchanges in a Mobile Satellite System (MSS) on behalf of a unit equipment (UE) originating a call to a second party without communicating with the UE.

29. The node according to claim 28 wherein the node is a Satellite Session Initiation Protocol Gateway (SSGW).

30. The node according to claim 29 wherein the progress and acknowledgement message exchanges includes 1XX session progress message exchanges.

31. The node according to claim 30 wherein the 1XX session progress message exchanges are 183 Session Progress message exchanges.

32. The node according to claim 30 wherein the acknowledge message exchanges includes PRACK message exchanges.

33. The node according to claim 29 wherein the SSGW withholds sending a first Session Description Protocol answer message to the UE.

34. The node according to claim 29 wherein a simplified Session Description Protocol (SDP) is used during message exchanges between the UE and the SSGW.

35. The node according to claim 34 wherein a codec of the second party is pre-provisioned by the SSGW as part of the second party configuration.