SYSTEM AND METHOD FOR PROVIDING LOW OVERHEAD FLOOR CONTROL IN A DISTRIBUTED PEER-TO-PEER COMMUNICATIONS NETWORK

• US 20090137263A1
• Filed: 11/28/2007
• Published: 05/28/2009
• Est. Priority Date: 11/28/2007
• Status: Active Grant

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Abbate, Alain D., Nair, Subhash P.
• Granted Patent: US 8,032,169 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 76/45 for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services

Abstract

A system and method for providing low overhead floor control in a distributed control two-way radio communications network (200) including one or more subscriber stations (201,205, 213, 215, 217) and one or more peer stations (203, 207, 211) interconnected via an Internet connection (209) using no central control. A subscriber station (201) utilizes a floor request during a timed floor request window (FRW) for requesting floor control to a given peer station (203). The system and method provide for consistent floor control decisions throughout the communications network (200) which includes a policy to block additional floor requests from local subscriber stations once an initial floor request has been received. This enables each peer to receive an identical set of floor requests as every other peer within the FRW such that every peer will grant the floor to the same subscriber.

Claims

1. A system for providing low overhead floor control in a distributed control two-way radio communications network comprising:

a plurality of subscriber stations;

a plurality of peer stations interconnected via an Internet connection using no central control; and

wherein at least one subscriber station of the plurality of subscriber stations utilize a floor request during a timed interval for requesting floor control to at least one peer station.

2. A system for providing low overhead floor control as in claim 1, wherein the timed interval is a floor request window (FRW).

3. A system for providing low overhead floor control as in claim 2, wherein only one floor request is granted at the expiration of the timed interval and all other floor requests from other subscribers are rejected.

4. A system for providing low overhead floor control as in claim 3, wherein once a floor request is granted to one subscriber, a subsequent floor request from another subscriber of equal or lower priority than a granted floor request will be rejected.

5. A system for providing low overhead floor control as in claim 3, wherein a floor request having a high priority may preempt a granted floor request.

6. A system for providing low overhead floor control as in claim 3, wherein an additional floor request from the subscriber that currently has the floor will be queued and subsequently granted the floor when the first communication is completed.

7. A system for providing low overhead floor control as in claim 1, wherein the timed interval is set at approximately twice the expected maximum message delay between a first peer and a second peer.

8. A system for providing low overhead floor control as in claim 1, wherein the at least one peer station utilizes a hang time for providing the plurality of subscribers a period to reply to a message sent by the at least one subscriber station without loosing floor control.

9. A system for providing low overhead floor control as in claim 2, wherein floor requests from the plurality of subscriber stations local to a peer are rejected once a floor request window has started for the at least one subscriber station.

10. A system for providing low overhead floor control as in claim 2, wherein floor requests from the plurality of subscriber stations on a different peer are allowed once a floor request window has started for the at least one subscriber station.

11. A system for providing low overhead floor control as in claim 1, wherein upon arrival of multiple floor requests from one subscriber during a floor request window (FRW), if one of the floor requests from that one subscriber is selected to win the floor, the earliest arriving request from that one subscriber is granted the floor and the remaining requests from that one subscriber are queued and subsequently granted the floor in the order of arrival when the first communication is completed.

12. A system for providing low overhead floor control as in claim 1, wherein each of the plurality of peer stations receive an identical set of floor requests as every other peer within the timed interval.

13. A system for providing access to a floor in a two-way radio distributed control communications network comprising:

a plurality of two-way radio subscriber stations communicating via a plurality of talk groups;

a plurality of peers each communicating via an Internet connection and having no centralized control node

a floor request timer associated with each of the plurality of peers; and

wherein at least one of the subscriber stations utilizes a floor request window (FRW) for requesting floor control of at least one of the plurality of peers such that an FRW has started floor requests are rejected from the plurality of subscriber stations local to a peer and allowed for subscriber station non-local to a peer.

14. A system for providing access as in claim 13, wherein the floor is granted to at least one requesting subscriber station at the expiration of the FRW.

15. A system for providing access as in claim 14, wherein once a floor request is granted to one subscriber station, a subsequent floor request from another subscriber station of equal or lower priority than a granted floor request will be rejected.

16. A system for providing access as in claim 14, wherein a floor request having a high priority may preempt a granted floor request from maintaining control of the floor.

17. A system for providing access as in claim 14, wherein an additional floor request from the subscriber station that currently has the floor will be queued and subsequently granted the floor when a call involving the subscriber station is completed.

18. A system for providing access as in claim 13, wherein a timer is used to provide a delay during transmissions by the at least one subscriber station to prevent loss of control of the floor.

19. A system for providing access as in claim 13, wherein the FRW is set at approximately twice the expected maximum message delay between a first peer and a second peer.

20. A system for providing access as in claim 13, wherein each of the plurality of peers receives an identical set of floor requests as every other peer within the FRW.

21. A method for providing low overhead floor control in a distributed control two-way radio communications network comprising the steps of:

providing a plurality of subscriber stations;

providing a plurality of peers interconnected via an Internet connection having no central control; and

utilizing a floor request during a timed interval by at least one subscriber station of the plurality of subscriber stations utilize for requesting floor control to at least one peer.

22. A method for providing low overhead floor control as in claim 21, further comprising the step of:

utilizing a floor request window (FRW) for the timed interval having a start time and stop time.

23. A method for providing low overhead floor control as in claim 22, further comprising the step of:

granting only one floor request at the expiration of the FRW such that all other floor requests are rejected until the end of a communication by the at least one subscriber.

24. A method for providing low overhead floor control as in claim 23, further comprising the step of:

preempting a subscriber from control of the floor if a subsequent floor request has a high priority.

25. A method for providing low overhead floor control as in claim 23, further comprising the step of

rejecting a subsequent floor request from another subscriber of equal or lower priority than a granted floor request once a floor request is granted to the at least one subscriber.

26. A method for providing low overhead floor control as in claim 23, further comprising the step of:

queuing a subsequent floor request if the subsequent floor request is of a higher priority; and

granting the subsequent floor request when a communication with the at least one subscriber is completed.

27. A method for providing low overhead floor control as in claim 21, further comprising the step of:

setting the timed interval to approximately twice the expected maximum message delay between a first peer and a second peer.

28. A method for providing low overhead floor control as in claim 21, further comprising the step of:

utilizing a delay time by the at least one peer station for providing the plurality of subscribers a period for reply to a message sent by the at least one subscriber station without loosing floor control.

29. A method for providing low overhead floor control as in claim 22, further comprising the step of:

rejecting floor requests from the plurality of subscriber stations local to a peer once an FRW has started; and

allowing floor requests from the plurality of subscriber stations non-local to a peer once an FRW has started.

30. A method for providing low overhead floor control as in claim 22, further comprising the step of:

receiving an identical set of floor requests for each of the plurality of peers as every other peer within the timed interval.