Method and system for processing PoC call based on answer mode of push to talk over cellular system client

• US 20060142037A1
• Filed: 11/16/2005
• Published: 06/29/2006
• Est. Priority Date: 11/17/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Sung-Jin, Lee, Kyung-Tak, Sung, Sang-Kyung, Park, Joon-Goo
• Granted Patent: US 7,751,841 B2
• Time in Patent Office: Days
• US Class Current: 455/518
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 65/4061 Push-to services, e.g. push-to-talk or push-to-video
• CPC Class Codes: H04L 65/65 Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
• CPC Class Codes: H04W 4/10 Push-to-Talk [PTT] or Push-On-Call services
• CPC Class Codes: H04W 76/45 for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services

Abstract

Disclosed is a method and system for establishing a session for a Push to Talk (PTT) over Cellular call (PoC). In the method, when an answer (response) mode of a PoC server and a PoC client are not in accordance with each other, an error message is transmitted to the receiving PoC server Moreover, call processing for a PoC call is improved by inserting a new data field indicating an automatic answer of a server into a payload of a Real-time Transport Protocol (RTCP) message, and a function of the terminal is extended using an added data field when the answer modes of the corresponding PoC server and PoC client are not in accordance with each other.

Claims

1. A call processing method in a PoC network in which a session is established in advance between a receiving PoC client and a receiving PoC server, and an automatic response mode is established in the receiving PoC server, the method comprising the steps of:

receiving, by the receiving PoC server, a call request message transmitted from a sending PoC server;

sending, by the receiving PoC server, a response signal corresponding to the call request message; and

receiving information to notify that a media stream will be transmitted to the receiving PoC client.

2. The method according to claim 1, wherein the information to notify that the media stream will be transmitted is embodied in Real-time Transport Control Protocol (RTCP) payload.

3. The method according to claim 1, wherein the information to notify that the media stream will be transmitted includes an address and a name of a sending PoC client.

4. The method according to claim 3, wherein the information to notify that the media stream will be transmitted further comprises information on a Manual Answer Override (MAO) indication.

5. The method according to claim 3, wherein the information to notify that the media stream will be transmitted further comprises at least one of version information, sub-type information, length information, and automatic answer indication information.

6. The method according to claim 1, further comprising the step of transmitting an error signal to the receiving PoC server when a response mode of the receiving PoC client is not in accord with a response mode of the receiving PoC server.

7. The method according to claim 6, wherein the error signal is embodied in a Real-time Transport Control Protocol (RTCP) payload.

8. The method according to claim 6, wherein the error signal includes a session termination request and an error code.

9. The method according to claim 6, wherein the error signal further comprises at least one of version information, sub-type information, length information, and an address and a name of a PoC client.

10. A call processing system in a PoC network in which a session is established in advance between a receiving PoC client and a receiving PoC server, and an automatic response mode is established in the receiving PoC server, the system comprising:

a PoC server for receiving a call request message transmitted from a sending PoC server, and sending a response message corresponding to the call request message; and

a receiving PoC client for receiving information to notify that a media stream will be received from the receiving PoC server.

11. The system according to claim 10, wherein the information to notify that the media stream will be received is embodied in a Real-time Transport Control Protocol (RTCP) payload.

12. The system according to claim 10, wherein the information to notify that the media stream will be received includes an address and a name of a sending PoC client.

13. The system according to claim 12, wherein the information to notify that the media stream will be received further comprises information on a Manual Answer Override (MAO) indication.

14. The system according to claim 12, wherein the information to notify that the media stream will be received further comprises at least one of version information, sub-type information, length information, and automatic answer indication information.

15. The system according to claim 10, wherein an error signal is transmitted to the receiving PoC server when a response mode of the receiving PoC client is not in accord with a response mode of the receiving PoC server.

16. The system according to claim 15, wherein the error signal is embodied in a Real-time Transport Control Protocol (RTCP) payload.

17. The system according to claim 15, wherein the error signal includes a session termination request and an error code.

18. The system according to claim 15, wherein the error signal further comprises at least one of version information, sub-type information, length information, and an address and a name of a PoC client.

19. A call processing method performed by a PoC client in a PoC network, the method comprising the steps of:

establishing, at the PoC client, a pre-established session with a PoC server;

establishing an automatic response mode to the PoC server; and

receiving information to notify that a media stream will be received from the PoC server which has received a call request message.

20. The method according to claim 19, wherein the information to notify that the media stream will be received is received in a Real-time Transport Control Protocol (RTCP) payload.

21. The method according to claim 19, wherein the information to notify that the media stream will be received includes an address and a name of a sending PoC client.

22. The method according to claim 21, wherein the information to notify that the media stream will be received further comprises information on a Manual Answer Override (MAO) indication.

23. The method according to claim 21, wherein the information to notify that the media stream will be received further comprises at least one of version information, sub-type information, length information, and automatic answer indication information.

24. The method according to claim 19, further comprising the step of transmitting an error signal to the receiving PoC server when a response mode of the receiving PoC client is not in accord with the response mode of the receiving PoC server.

25. The method according to claim 19, wherein the error signal is transmitted in a Real-time Transport Control Protocol (RTCP) payload.

26. The method according to claim 24, wherein the error signal includes a session termination request and an error code.

27. The method according to claim 24, wherein the error signal further comprises at least one of version information, sub-type information, length information, and an address and a name of a PoC client.

28. A PoC client for performing call processing in a PoC network, comprising:

a PoC client for;

establishing a pre-established session with a receiving PoC server, establishes an automatic response mode with the receiving PoC server; and

receiving information to notify that a media stream will be received from the PoC server which has received a call request message.

29. The PoC client according to claim 28, wherein the information to notify that the media stream will be received is embodied in a Real-time Transport Control Protocol (RTCP) payload.

30. The PoC client according to claim 28, wherein the information to notify that the media stream will be received includes an address and name of a sending PoC client.

31. The PoC client according to claim 28, wherein the information to notify that the media stream will be received further comprises information on a Manual Answer Override (MAO) indication.

32. The PoC client according to claim 28, wherein the information to notify that the media stream will be transmitted further comprises at least one of version information, sub-type information, length information, and automatic answer indication information.

33. The PoC client according to claim 28, wherein an error signal is transmitted to the receiving PoC server when a response mode of the receiving PoC client is not in accord with the response mode of the receiving PoC server.

34. The PoC client according to claim 33, wherein the error signal is embodied in a Real-time Transport Control Protocol (RTCP) payload.

35. The PoC client according to claim 33, wherein the error signal a session termination request and an error code.

36. The PoC client according to claim 34, wherein the error signal further comprises at least one of version information, sub-type information, length information, and an address and a name of the PoC user.