Trunking and push-to-talk mechanisms for WCDMA wireless communications

• US 20060003784A1
• Filed: 04/19/2005
• Published: 01/05/2006
• Est. Priority Date: 04/19/2004
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Chion, Mary, Fang, Yonggang
• Granted Patent: US 8,335,533 B2
• Time in Patent Office: Days
• US Class Current: 455/518
• CPC Class Codes: H04W 4/10 Push-to-Talk [PTT] or Push-On-Call services
• CPC Class Codes: H04W 52/54 Signalisation aspects of the TPC commands, e.g. frame structure
• CPC Class Codes: H04W 76/45 for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services
• CPC Class Codes: H04W 84/08 Trunked mobile radio systems

Abstract

Methods and systems for implementing trunking techniques in WCDMA systems for handling group calls and push-to-talk services.

Claims

1. A method for providing group calls and sharing communication channels in the group calls in a WCDMA wireless communication system based on UTRA FDD, comprising:

assigning one forward dedicated channel (DCH) per group member per sector in a group of members for group calls to carry signaling messages and power control information; and

having all group members in a sector to share one forward dedicated shared channel (DSCH) to carry user data.

2. The method as in claim 1, further comprising using a Connection Setup message to ask all group members to listen to the DSCH continuously.

3. The method as in claim 1, further comprising assigning one reverse dedicated link channel (DCH) per group member in a sector to carry signaling messages, power control information and user data.

4. The method as in claim 1, further comprising using a packet data network to support push-to-talk (PTT) calls in group calls.

5. The method as in claim 4, further comprising applying a header compression in a PTT call.

6. The method as in claim 5, further comprising setting the radio link control protocol (RLC) for a PTT call in a transparent mode.

7. The method as in claim 1, further comprising shortening a discontinuous reception (DRX) cycle when a PTT mobile is powered on.

8. The method as in claim 7, further comprising setting up radio resource control signaling connection and entering Cell_PCH state in a connected mode when the PTT mobile is powered on.

9. The method as n claim 7, further comprising controlling the PTT mobile in Cell_PCH state to monitor the paging channel with DRX

10. The method as in claim 1, further comprising shortening a discontinuous reception (DRX) cycle when a PTT call on a PTT mobile is released.

11. The method as in claim 10, further comprising controlling a PTT mobile to exit Cell_DCH state and enter Cell_FACH state when the PTT call is released.

12. The method as in claim 10, further comprising starting a Fast Reconnection Timer when the PTT call is released.

13. The method as in claim 10, further comprising controlling the PTT mobile to monitor forward FACH and BCCH channels in the Cell_FACH state without DRX.

14. The method as in claim 10, further comprising controlling the PTT mobile, after Fast Reconnection Timer expirers, to exit Cell_FACH state and to enter Cell_PCH state to monitor the paging channel with DRX.

15. The method as in claim 14, further comprising setting the Fast Reconnection Timer to be configurable.

16. The method as in claim 1, further comprising using a dispatcher server or a push-to-talk (PTT) mobile to generate PTT related signaling messages.

17. A method for providing group calls and sharing communication channels in the group calls in a WCDMA wireless communication system based on UTRA FDD, comprising:

assigning one forward broadcast channel (FACH) to be shared by all group members per sector in a group to carry signaling messages;

assigning one forward dedicated channel (DCH) to be shared by all group members per sector to carry user data; and

assigning at least one common power control channel to be shared by all group members to carry power control information.

18. The method as in claim 17, wherein the forward broadcast channel includes a message addressed to a mobile station, the message includes U_RANI in the MAC header.

19. The method as in claim 17, wherein the forward dedicated channel (DCH) is shared by all group member in a group per sector to carry user traffic.

20. The method as in claim 19, wherein each group member has its own physical forward dedicated channel which is shared by assigning a common channelisation code to all forward dedicated channels in a group per sector.

21. The method as in claim 17, wherein the forward dedicated channel does not transmit TPC bits.

22. The method as in claim 17, further comprising using the common power control channel to carry power control information for the reverse link (TPC bits).

23. The method as in claim 17, further comprising using a Secondary CCPCH as the common power control channel.

24. The method as in claim 17, further comprising assigning one reverse dedicated link channel per group member in a sector to carry signaling messages, power control information and user data.

25. The method as in claim 17, further comprising using a packet data network to support push-to-talk (PTT) calls in group calls.

26. The method as in claim 25, further comprising applying a header compression in a PTT call.

27. The method as in claim 26, further comprising setting the radio link control protocol for PTT call in the transparent mode.

28. The method as in claim 17, further comprising shortening a discontinuous reception (DRX) cycle when a PTT mobile is powered on.

29. The method as in claim 28, further comprising setting up radio resource control signaling connection and entering Cell_PCH state in a connected mode when the PTT mobile is powered on.

30. The method as n claim 28, further comprising controlling the PTT mobile in Cell_PCH state to monitor the paging channel with DRX

31. The method as in claim 17, further comprising shortening a discontinuous reception (DRX) cycle when a PTT call on a PTT mobile is released.

32. The method as in claim 31, further comprising controlling a PTT mobile to exit Cell_DCH state and enter Cell_FACH state when the PTT call is released.

33. The method as in claim 31, further comprising starting a Fast Reconnection Timer when the PTT call is released.

34. The method as in claim 31, further comprising controlling the PTT mobile to monitor forward FACH and BCCH channels in the Cell_FACH state without DRX.

35. The method as in claim 31, further comprising controlling the PTT mobile, after Fast Reconnection Timer expirers, to exit Cell_FACH state and to enter Cell_PCH state to monitor the paging channel with DRX.

36. The method as in claim 35, further comprising setting the Fast Reconnection Timer to be configurable.

37. The method as in claim 17, further comprising using a dispatcher server or a push-to-talk (PTT) mobile to generate PTT related signaling messages.

38. The method as in claim 17, further comprising using the Direct Transfer message over the air to deliver signaling messages.