Push-to-talk reverse channel establishment

• US 7,353,036 B2
• Filed: 05/10/2004
• Issued: 04/01/2008
• Est. Priority Date: 05/10/2004
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Patzer, Robert, Lemke, Mark R., Vogedes, Jerome O.
• Primary Examiner(s): SHARMA, SUJATHA R
• Application Number:
  US10/842,674
• Publication Number:
  US 20050250523A1
• Time in Patent Office: 1,422 Days
• Field of Search: 455517-520, 455507-509, 455524-526, 455/450, 455/452.1, 455/515, 455/464, 455/456.6, 455/566, 370/340, 370/341, 370/327, 370/329, 370/260, 370/312, 370/400
• US Class Current: 455/509
• 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 76/10 Connection setup
• 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

A push-to-talk (PTT) radio resource controller (441) establishes a “reverse” channel using a forward channel resource request module (461), a reverse channel resource request module (463), an allocation rules module (470) that is coupled to the forward channel resource request module (461) and the reverse channel resource request module (463), and a channel resource availability module (480) that is coupled to the allocation rules module (470). A method (300) for establishing a reverse channel in a PTT system initiates a forward PTT circuit (313) between an originating device and at least a first called device, initiates a first reverse PTT circuit (319) between the first called device and the originating device before releasing (329) the forward PTT circuit, and then releases (339) the first reverse PTT circuit.

Claims

1. A push-to-talk radio resource controller comprising:

a forward channel resource request module, for requesting push-to-talk channel resources for forward traffic from an originating mobile device to at least one called mobile device;

a reverse channel resource request module, for requesting push-to-talk channel resources for reverse traffic from the at least one called mobile device to the originating mobile device, before a forward push-to-talk circuit from the originating mobile device to the at least one called mobile device is released;

an allocation rules module, coupled to the forward channel resource request module and the reverse channel resource request module; and

a channel resource availability module, coupled to the allocation rules module.

2. A push-to-talk radio resource controller in accordance with claim 1 further comprising:

a forward channel release module, coupled to the channel resource availability module; and

a reverse channel release module, coupled to the channel resource availability module.

3. A push-to-talk radio resource controller in accordance with claim 1 wherein the channel resource availability module comprises:

a forward channel resource availability module; and

a reverse channel resource availability module.

4. A push-to-talk radio resource controller in accordance with claim 3 wherein the forward channel resource availability module comprises:

a connection for receiving an external release trigger.

5. A push-to-talk radio resource controller in accordance with claim 3 wherein the reverse channel resource availability module comprises:

a connection for receiving an external release trigger.

6. A push-to-talk radio resource controller in accordance with claim 3 wherein the forward channel resource availability module comprises:

a timer for determining an internal release trigger.

7. A push-to-talk radio resource controller in accordance with claim 3 wherein the reverse channel resource availability module comprises:

a timer for determining an internal release trigger.

8. A method for establishing a reverse channel in a push-to-talk (PTT) system comprising the steps of:

initiating a forward PTT circuit for forward traffic from an originating device to at least a first called device;

initiating a first reverse PTT circuit for reverse traffic from the first called device to the originating device before the forward PTT circuit is released;

releasing the forward PTT circuit; and

releasing the first reverse PTT circuit.

9. A method for establishing a reverse channel in a push-to-talk (PTT) system according to claim 8 further comprising the steps of:

initiating a second reverse PTT circuit from a second called device to the originating device, before releasing the forward PTT circuit; and

releasing the second reverse PTT circuit, before releasing the forward PTT circuit.

10. A method for establishing a reverse channel in a push-to-talk (PTT) system according to claim 8 further comprising the steps of:

initiating a second reverse PTT circuit from a second called device to the originating device, before releasing the forward PTT circuit; and

releasing the second reverse PTT circuit, before releasing the first reverse PTT circuit.

11. A method for establishing a reverse channel in a push-to-talk (PTT) system according to claim 10 further comprising the steps of:

receiving a release trigger for the second called device, before releasing the second reverse PTT circuit.

12. A method for establishing a reverse channel in a push-to-talk (PTT) system according to claim 8 further comprising the steps of:

initiating a second reverse PTT circuit from a second called device to the originating device, before releasing the forward PTT circuit; and

releasing the second reverse PTT circuit, after releasing the first reverse PTT circuit.

13. A method for establishing a reverse channel in a push-to-talk (PTT) system according to claim 8 further comprising the steps of:

receiving a request for access from the originating device, before initiating the forward PTT circuit.

14. A method for establishing a reverse channel in a push-to-talk (PTT) system according to claim 8 further comprising the steps of:

receiving a request for access from the first called device, before releasing the first reverse PTT circuit.

15. A method for establishing a reverse channel in a push-to-talk (PTT) system according to claim 8 further comprising the steps of:

receiving a release trigger for the originating device, before releasing the forward PTT circuit.

16. A method for establishing a reverse channel in a push-to-talk (PTT) system according to claim 15, wherein the release trigger is an external release trigger generated by the originating device.

17. A method for establishing a reverse channel in a push-to-talk (PTT) system according to claim 15, wherein the release trigger is an internal release trigger generated by a PTT radio resource controller.

18. A method for establishing a reverse channel in a push-to-talk (PTT) system according to claim 8 further comprising the steps of:

receiving a release trigger for the first called device, before releasing the first reverse PTT circuit.

19. A method for establishing a reverse channel in a push-to-talk (PTT) system according to claim 18, wherein the release trigger is an external release trigger generated by the first called device.

20. A method for establishing a reverse channel in a push-to-talk (PTT) system according to claim 18, wherein the release trigger is an internal release trigger generated by a PTT radio resource controller.