PT service system and method

• US 20060019692A1
• Filed: 07/25/2005
• Published: 01/26/2006
• Est. Priority Date: 07/24/2004
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Huh, Kang-Suk, Park, Young Hwan, Yoon, Kyung-Ae, Park, Jong Chul
• Granted Patent: US 7,561,892 B2
• Time in Patent Office: Days
• US Class Current: 455/518
• CPC Class Codes: H04L 65/1013 Network architectures, gateways, control or user entities
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/4061 Push-to services, e.g. push-to-talk or push-to-video
• 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

A PT service system and method are provided. According to an embodiment, there is provided a client device comprising a PT (push-to) client to transmit a talk burst request message for requesting a permission to send a talk burst. The talk burst request message includes a timestamp which includes time information associated with the transmission of the talk burst request message.

Claims

1. A client device comprising:

a PT (push-to) client to transmit a talk burst request message for requesting a permission to send a talk burst, the talk burst request message including a timestamp which includes time information associated with a transmission of the talk burst request message.

2. The device of claim 1, wherein the time information in the timestamp identifies a user-requested time of the talk burst request message.

3. The device of claim 1, wherein the PT client receives a talk burst granted message from a PT server responding to the talk burst request message and performs the talk burst upon receipt of the talk burst granted message.

4. The device of claim 1, wherein if the PT client does not receive a response message within a certain time duration after the PT client has transmitted the talk burst request message, then the PT client retransmits a talk burst request message including a timestamp.

5. The device of claim 4, wherein the timestamp of the retransmitted talk burst request message is the same as the timestamp of the original talk burst request message.

6. The device of claim 4, wherein the response message is a talk burst request queue status response message.

7. The device of claim 1, wherein a value of the timestamp is used to determine a position of the talk burst request message in a talk burst request queue.

8. The device of claim 7, wherein the PT client has the permission to send a talk burst, if the talk burst request message of the PT client is placed at a head of the talk burst request queue.

9. The device of claim 1, wherein the talk burst involves transmission of video, images, signals, or data.

10. The device of claim 1, wherein the talk burst involves transmission of voice data.

11. A client device comprising:

a PT (push-to) client to repeat a transmission of a talk burst request message for requesting a permission to send a talk burst, until the PT client receives a response message,

wherein the repeated talk burst request message includes a timestamp value that indicates when the talk burst message was first transmitted.

12. The device of claim 11, wherein the response message is a talk burst request queue status response message.

13. The device of claim 11, wherein the timestamp value is used to determine a position of the talk burst request message in a talk burst request queue.

14. The device of claim 13, wherein the PT client has the permission to send a talk burst, if the talk burst request message of the PT client is placed at a head of the talk burst request queue.

15. The device of claim 11, wherein the talk burst involves transmission of video, images, signals, or data.

16. The device of claim 11, wherein the talk burst involves transmission of voice.

17. A server system comprising:

a PT (push-to) server to receive and process at least one talk burst request message each for requesting a permission to send a talk burst,

wherein the at least one talk burst request message each includes a timestamp which includes time information associated with a transmission of the corresponding talk burst request message.

18. The system of claim 17, wherein the time information in the timestamp identifies a user-requested time of the corresponding talk burst request message.

19. The system of claim 17, wherein the PT server receives a plurality of talk burst request messages respectively from a plurality of different PT clients, and places requests of the received talk burst request messages in a queue according to values of the timestamps in the received talk burst request messages.

20. The system of claim 19, wherein the PT server gives a permission to send a talk burst to the PT clients in a certain order according to a position of their requests in the queue.

21. The system of claim 19, wherein the PT server gives a permission to send a talk burst, to one of the PT clients which has its request placed at a head of the queue.

22. The system of claim 19, wherein the PT server transmits a response message to a PT client in response to the corresponding talk burst request message.

23. The system of claim 22, wherein the response message is a talk burst request queue status response message.

24. The system of claim 19, wherein if the PT server changes a position of the requests in the queue, then the PT server sends a notice regarding the change to all PT clients that have their requests placed in the queue.

25. The system of claim 17, wherein the talk burst involves transmission of video, images, signals, or data.

26. The system of claim 17, wherein the talk burst involves transmission of voice.

27. The system of claim 17, wherein the PT server discards a talk burst request message if a value of the timestamp in that talk burst request message is earlier than a current time at the PT server by more than a certain amount.

28. A method of providing a PT (push-to) service, the method comprising:

transmitting, by a PT client, a talk burst request message for requesting a permission to send a talk burst, the talk burst request message including a timestamp which includes time information associated with a transmission of the talk burst request message.

29. The method of claim 28, wherein the time information in the timestamp identifies a user-requested time of the talk burst request message.

30. The method of claim 28, further comprising:

receiving, by the PT client, a talk burst granted message from a PT server responding to the talk burst request message; and

performing, by the PT client, the talk burst upon receipt of the talk burst granted message.

31. The method of claim 28, further comprising:

retransmitting, by the PT client, a talk burst request message including a timestamp, if the PT client does not receive a response message within a certain time duration after the PT client has transmitted the talk burst request message in the transmitting step.

32. The method of claim 31, wherein the timestamp of the retransmitted talk burst request message is the same as the timestamp of the original talk burst request message.

33. The method of claim 31, wherein the response message is a talk burst request queue status response message.

34. The method of claim 28, wherein a value of the timestamp is used to determine a position of the talk burst request message in a talk burst request queue.

35. The method of claim 34, wherein the PT client has the permission to send a talk burst, if the talk burst request message of the PT client is placed at a head of the talk burst request queue.

36. The method of claim 28, wherein the talk burst involves transmission of video, images, signals, or data.

37. The method of claim 28, wherein the talk burst involves transmission of voice data.

38. A method of providing a PT (push-to) service, the method comprising:

receiving, by a PT server, at least one talk burst request message each for requesting a permission to send a talk burst, wherein the at least one talk burst request message each includes a timestamp which includes time information associated with a transmission of the corresponding talk burst request message; and

processing, by the PT server, the at least one talk burst request message.

39. The method of claim 38, wherein the time information in the timestamp identifies a user-requested time of the corresponding talk burst request message.

40. The method of claim 38, wherein in the receiving step, the PT server receives a plurality of talk burst request messages respectively from a plurality of different PT clients, and

wherein the processing step includes placing requests of the received talk burst request messages in a queue according to values of the timestamps in the received talk burst request messages.

41. The method of claim 40, wherein the PT server gives a permission to send a talk burst to the PT clients in a certain order according to a position of their requests in the queue.

42. The method of claim 40, wherein in the processing step, the PT server gives a permission to send a talk burst, to one of the PT clients which has its request placed at a head of the queue.

43. The method of claim 40, further comprising:

transmitting, by the PT server, a response message to each of the PT clients in response to the corresponding talk burst request message.

44. The method of claim 43, wherein the response message is a talk burst request queue status response message.

45. The method of claim 40, further comprising:

if the PT server changes a position of the requests in the queue, sending, by the PT server, a notice regarding the change to all PT clients that have their requests placed in the queue.

46. The method of claim 38, wherein the talk burst involves transmission of video, images, signals, or data.

47. The method of claim 38, wherein the talk burst involves transmission of voice.

48. The method of claim 38, wherein the processing step includes:

discarding, by the PT server, a talk burst request message if a value of the timestamp in that talk burst request message is earlier than a current time at the PT server by more than a certain amount.

49. A PT (push-to) service method of a system including a PT server and a plurality of PT clients, the method comprising:

transmitting, by each of the PT clients, a talk burst request message including a timestamp; and

determining, by the PT server, talk burst request queue positions of the PT clients at least based on the timestamps.

50. The method of claim 49, wherein each of the timestamps includes time information associated with a transmission of the corresponding talk burst request message.

51. The method of claim 49, further comprising:

retransmitting, by one of the PT clients, a talk burst request message including a timestamp, if the one PT client does not receive a response message within a certain time duration after the one PT client has transmitted the talk burst request message in the transmitting step.

52. The method of claim 51, wherein in the retransmitting step, the timestamp of the retransmitted talk burst request message is the same as the timestamp of the talk burst request message transmitted in the transmitting step.

53. The method of claim 49, wherein the determining step includes:

placing, by the PT server, requests of the received talk burst request messages in a talk burst request queue according to values of the timestamps in the received talk burst request messages.

54. The method of claim 53, wherein the PT server gives a permission to send a talk burst to the PT clients in a certain order according to a position of their requests in the queue.

55. The method of claim 53, wherein the PT server gives a permission to send a talk burst, to one of the PT clients which has its request placed at a head of the talk burst request queue.

56. The method of claim 49, wherein the talk burst involves transmission of video, images, signals, or data.

57. The method of claim 49, wherein the talk burst involves transmission of voice.

58. The method of claim 49, further comprising:

discarding, by the PT server, any talk burst request message if a value of the timestamp in that talk burst request message is earlier than a current time at the PT server by more than a certain amount.