Methods and apparatus for supporting broadcast communications in a peer to peer network

• US 8,495,232 B2
• Filed: 07/02/2008
• Issued: 07/23/2013
• Est. Priority Date: 07/10/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Wu, Xinzhou, Tavildar, Saurabh, Park, Vincent D., Li, Junyi, Laroia, Rajiv
• Primary Examiner(s): BOUTAH, ALINA A
• Application Number:
  US12/166,634
• Publication Number:
  US 20090019173A1
• Time in Patent Office: 1,847 Days
• Field of Search: 709/230, 709/228, 370/235
• US Class Current: 709/230
• CPC Class Codes: H04W 72/30 Resource management for broadcast services

Abstract

Methods and apparatus related to broadcasting data in a peer to peer wireless communications network are described. A timing structure is utilized employing slots of a first type which support broadcast traffic transmissions and unicast traffic transmissions and slots of a second type which support unicast traffic transmission but do not support broadcast traffic transmissions. In various embodiments, traffic air link resource scheduling is performed in a decentralized manner on a slot by slot basis. In some such embodiments, a wireless device prior to transmitting a broadcast data traffic signal, transmits a broadcast transmission request signal, sometimes alternatively referred to as a broadcast indicator signal; and a wireless device prior to transmitting a peer to peer unicast signal, transmits a peer to peer traffic transmission request signal. In various embodiments, for slots of the first type, broadcast transmission requests have priority over peer to peer unicast transmission requests.

Claims

1. A method, comprising operating a first device to perform the steps of:

determining that broadcast data is to be transmitted;

identifying a broadcast transmission request resource in a recurring timing structure including transmission request intervals of a first type which support broadcast transmission requests and a second type which are limited to supporting unicast transmission requests;

transmitting a transmission request in said identified broadcast transmission request resource;

receiving a transmission request response in response to the transmission request, the transmission request having a first priority and the transmission request response having a second priority; and

determining to abstain from transmitting the broadcast data when the second priority is greater than the first priority.

2. The method of claim 1, wherein said transmission request intervals of the first type support both broadcast and unicast transmission requests.

3. The method of claim 1, wherein the number of second type transmission request intervals exceeds the number of first type transmission request intervals in said recurring timing structure.

4. The method of claim 3, wherein said recurring timing structure includes unicast data transmission intervals which are limited to use in transmitting unicast data;

and

wherein unicast data transmission intervals are limited to corresponding to transmission request intervals of the second type.

5. The method of claim 1, wherein said recurring timing structure includes slots dedicated to unicast transmissions and slots that support broadcast transmissions.

6. The method of claim 5, wherein at least some of the slots which support broadcast transmissions also support unicast transmissions.

7. The method of claim 6, wherein transmission request resources corresponding to broadcast transmissions in a slot which supports both unicast and broadcast transmissions have a higher priority than transmission request resources corresponding to unicast transmissions in said slot.

8. The method of claim 5, wherein transmitting a transmission request in said identified broadcast transmission request resource includes transmitting in a slot which supports broadcast transmissions.

9. The method of claim 8, further comprising:

when having unicast data to transmit, transmitting a request in a transmission slot which supports unicast transmissions.

10. The method of claim 1,

further comprising:

determining to transmit the broadcast data when the second priority is less than the first priority; and

transmitting the broadcast data when the second priority is less than the first priority.

11. The method of claim 1, wherein locations of said transmission request intervals of said first and second type are predetermined prior to performing said steps of identifying a broadcast transmission request resource and transmitting a transmission request.

12. A device comprising:

a broadcast determination module configured to determine if broadcast data is to be transmitted;

a broadcast resource identification module configured to identify a broadcast transmission request resource in a recurring timing structure including transmission request intervals of a first type which support broadcast transmission requests and a second type which are limited to supporting unicast transmission requests;

a broadcast transmission request signal generation module configured to generate a broadcast transmission request when said broadcast determination module determines that broadcast data is to be transmitted;

a wireless transmitter module;

a broadcast request control module configured to control the wireless transmitter module to transmit said generated broadcast transmission request in said identified broadcast transmission request resource; and

a broadcast response module configured to receive a transmission request response in response to the transmission request, the transmission request having a first priority and the transmission request response having a second priority, and configured to determine to abstain from transmitting the broadcast data when the second priority is greater than the first priority.

13. The device of claim 12, further comprising:

a memory including information identifying said recurring timing structure.

14. The device of claim 12, wherein said transmission request intervals of the first type support both broadcast and unicast transmission requests.

15. The device of claim 12, wherein the number of second type transmission request intervals exceeds the number of first type transmission request intervals in said recurring timing structure.

16. The device of claim 15, wherein said recurring timing structure includes unicast data transmission intervals which are limited to use in transmitting unicast data;

and

wherein unicast data transmission intervals are limited to corresponding to transmission request intervals of the second type.

17. The device of claim 12, wherein said recurring timing structure includes slots dedicated to unicast transmissions and slots that support broadcast transmissions.

18. The device of claim 17, wherein at least some of the slots which support broadcast transmissions also support unicast transmissions.

19. The device of claim 18, wherein transmission request resources corresponding to broadcast transmissions in a slot which supports both unicast and broadcast transmissions have a higher priority than transmission request resources corresponding to unicast transmissions in said slot.

20. The device of claim 17, wherein transmitting a transmission request in said identified broadcast transmission request resource includes transmitting in a slot which supports broadcast transmissions.

21. The device of claim 20, further comprising:

a unicast determination module configured to determine if unicast data is to be transmitted;

a unicast transmission request signal generation module configured to generate a unicast transmission request when said unicast determination module determines that unicast data is to be transmitted; and

a unicast request control module configured to control the wireless transmitter module to transmit said generated unicast transmission request in said identified unicast transmission request resource in a transmission slot which supports unicast transmissions.

22. A device comprising:

broadcast determination means for determining if broadcast data is to be transmitted;

broadcast resource identification means for identifying a broadcast transmission request resource in a recurring timing structure including transmission request intervals of a first type which support broadcast transmission requests and a second type which are limited to supporting unicast transmission requests;

broadcast transmission request signal generation means for generating a broadcast transmission request when said broadcast determination means determines that broadcast data is to be transmitted;

a wireless transmitter means; and

broadcast request control means for controlling the wireless transmitter means to transmit said generated broadcast transmission request in said identified broadcast transmission request resource;

broadcast response means for receiving a transmission request response in response to the transmission request, the transmission request having a first priority and the transmission request response having a second priority, and for determining to abstain from transmitting the broadcast data when the second priority is greater than the first priority.

23. The device of claim 22, further comprising:

memory means including information identifying said recurring timing structure.

24. The device of claim 22, wherein said transmission request intervals of the first type support both broadcast and unicast transmission requests.

25. The device of claim 22, wherein the number of second type transmission request intervals exceeds the number of first type transmission request intervals in said recurring timing structure.

26. The device of claim 25, wherein said recurring timing structure includes unicast data transmission intervals which are limited to use in transmitting unicast data;

and

wherein unicast data transmission intervals are limited to corresponding to transmission request intervals of the second type.

27. A computer program product, the computer program product comprising:

non-transitory computer readable medium comprising;

code for causing a computer to determine that broadcast data is to be transmitted;

code for causing a computer to identify a broadcast transmission request resource in a recurring timing structure including transmission request intervals of a first type which support broadcast transmission requests and a second type which are limited to supporting unicast transmission requests;

code for causing a computer to control transmitting a transmission request in said identified broadcast transmission request resource;

code for causing a computer to receive a transmission request response in response to the transmission request, the transmission request having a first priority and the transmission request response having a second priority; and

code for causing a computer to determine to abstain from transmitting the broadcast data when the second priority is greater than the first priority.

28. The computer program product of claim 27, wherein said transmission request intervals of the first type support both broadcast and unicast transmission requests.

29. The computer program product of claim 27, wherein the number of second type transmission request intervals exceeds the number of first type transmission request intervals in said recurring timing structure.