Methods and apparatus for controlling interference to broadcast signaling in a peer to peer network

• US 8,724,609 B2
• Filed: 05/27/2011
• Issued: 05/13/2014
• 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): Mesfin, Yemane
• Assistant Examiner(s): DUONG, CHRISTINE T
• Application Number:
  US13/118,092
• Publication Number:
  US 20110228691A1
• Time in Patent Office: 1,082 Days
• Field of Search: None
• US Class Current: 370/344
• CPC Class Codes: H04L 12/1881 with schedule organisation, e.g. priority, sequence management
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04W 28/0236 radio quality, e.g. interference, losses or delay
• CPC Class Codes: H04W 72/30 Resource management for broadcast services
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 72/566 of the information or information source or recipient
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

Methods and apparatus related to broadcasting data and interference management in a peer to peer wireless communications network are described. Scheduling of traffic air link resources is performed on a slot by slot basis in a decentralized manner. Wireless devices intending to broadcast traffic signals transmit broadcast request signals, sometimes alternatively referred to as broadcast indicator signals. A priority level is associated with each of the broadcast request signals. A receiver device intending to receive broadcast signals detects the broadcast request signals and makes an interference determination as to whether the higher priority broadcast traffic signal can be successfully recovered in the presence of lower priority broadcast traffic signals. If the determination is that the expected interference from the lower priority broadcast traffic is unacceptable, the receiver device generates and transmits an interference control signal communicating to the lower priority device a command or request not to broadcast.

Claims

1. A method of operating a first device, comprising:

receiving from a second device a first broadcast indicator signal having a first priority corresponding to said second device indicating an intent by the second device to broadcast data;

receiving from a third device a second broadcast indicator signal having a second priority corresponding to said third device indicating an intent by the third device to broadcast data;

making a decision as to whether or not to transmit an interference control signal as a function of the relative priority of the first and second broadcast indicator signals;

determining if broadcast by the lower priority one of the second and third devices will produce an unacceptable level of interference to the higher priority one of the second and third devices; and

transmitting, when said decision is to transmit the interference control signal, the interference control signal having a priority which is based on the priority of the higher one of the first priority and the second priority.

2. The method of claim 1, wherein making a decision as to whether or not to transmit an interference control signal includes:

deciding to transmit said interference control signal when it is determined that the level of interference is unacceptable.

3. The method of claim 1, wherein transmitting said interference control signal includes transmitting said interference control signal at a priority level corresponding to the priority level of the higher priority one of the second and third devices.

4. The method of claim 3, wherein transmitting the interference control signal includes selecting an interference signal resource having the priority level of the higher priority one of the second and third devices from a plurality of interference signal transmission resources, at least some of said interference signal transmission resources corresponding to different priority levels.

5. The method of claim 1, wherein transmitting the interference control signal includes:

transmitting the interference control signal on an interference signal transmission resource, said interference signal transmission resource being an individual OFDM tone-symbol.

6. The method of claim 3, wherein the priority of the first and second devices changes with time.

7. A wireless communications device, comprising:

a wireless receiver configured to receive signals;

a broadcast indicator signal monitoring module configured to;

(i) detect in said received signals a first broadcast indicator signal from a second device, said first broadcast indicator signal having a first priority corresponding to said second device, said first broadcast indicator signal indicating an intent by the second device to broadcast data; and

(ii) detect in said received signals a second broadcast indicator signal from a third device, said second broadcast indicator signal having a second priority corresponding to said third device, said second broadcast indicator signal indicating an intent by the third device to broadcast data;

an interference control signaling decision module configured to make a decision as to whether or not to transmit an interference control signal as a function of the relative priority of the first and second broadcast indicator signals;

an interference tolerance determination sub-module configured to determine if broadcast by the lower priority one of the second and third devices will produce an unacceptable level of interference to the higher priority one of the second and third devices; and

a wireless transmitter configured to transmit, when said interference control signaling decision module decides to transmit the interference control signal, the interference control signal having a priority which is based on the priority of the higher one of the first priority and the second priority.

8. The wireless communications device of claim 7, wherein said interference decision signaling decision module includes:

an interference control signal generation module configure to generate said interference control signal; and

an interference control signal control module configured to control said wireless transmitter to transmit the generated interference control signal when the interference control signaling decision module decides to transmit an interference control signal.

9. The wireless communications device of claim 8, wherein said interference control signaling decision module decides to transmit said interference control signal when the interference tolerance determination sub-module determines that the level of interference is unacceptable.

10. The wireless communications device of claim 8, wherein said interference control signal control module is configured to control the wireless transmitter to transmit the generated control interference signal at a priority level corresponding to the priority level of the higher priority one of the second and third devices.

11. The wireless communications device of claim 8, wherein said interference control signal control module further includes:

a response resource selection module configured to select an interference signal resource having the priority level of the higher priority one of the second and third devices from a plurality of interference signal transmission resources, at least some of said interference signal transmission resources corresponding to different priority levels.

12. The wireless communications device of claim 7, wherein the wireless transmitter is configured to transmit the interference control signal on an interference signal transmission resource, said interference signal transmission resource being an individual OFDM tone-symbol.

13. The wireless communications device of claim 8, wherein the priority of the first and second devices changes with time, the wireless communications device further comprising:

stored information used to associate a device identifier with a priority level for each of a plurality of slots in a recurring timing structure.

14. A wireless communications device, comprising:

wireless receiver means for receiving signals;

broadcast signal monitoring means for;

(i) detecting in said received signals a first broadcast indicator signal from a second device, said first broadcast indicator signal having a first priority corresponding to said second device, said first broadcast indicator signal indicating an intent by the second device to broadcast data; and

(ii) detecting in said received signals a second broadcast indicator signal from a third device, said second broadcast indicator signal having a second priority corresponding to said third device, said second broadcast indicator signal indicating an intent by the third device to broadcast data;

interference control signaling decision means for making a decision as to whether or not to transmit an interference control signal as a function of the relative priority of the first and second broadcast indicator signals;

interference tolerance determination means for determining if broadcast by the lower priority one of the second and third devices will produce an unacceptable level of interference to the higher priority one of the second and third devices; and

wireless transmitter means for transmitting, when said interference control signaling decision means for making a decision decides to transmit the interference control signal, the interference control signal having a priority which is based on the priority of the higher one of the first priority and the second priority.

15. The wireless communications device of claim 14, wherein said interference decision signaling decision means includes:

interference control signal generation means for generating said interference control signal; and

interference control signal control means for controlling said wireless transmitter means to transmit the generated interference control signal when the interference control signaling decision means decides to transmit an interference control signal.

16. The wireless communications device of claim 15, wherein said interference control signaling decision means decides to transmit said interference control signal when the interference tolerance determination means determines that the level of interference is unacceptable.

17. A computer program product for use in a communications device, the computer program product comprising:

a non-transitory computer readable medium comprising;

code for causing a computer to receive, from a second device a first broadcast indicator signal having a first priority corresponding to said second device indicating an intent by the second device to broadcast data;

code for causing a computer to receive from a third device a second broadcast indicator signal having a second priority corresponding to said third device indicating an intent by the third device to broadcast data;

code for causing a computer to make a decision as to whether or not to transmit an interference control signal as a function of the relative priority of the first and second broadcast indicator signals;

code for determining if broadcast by the lower priority one of the second and third devices will produce an unacceptable level of interference to the higher priority one of the second and third devices; and

code for causing a computer to transmit, when a decision to transmit the interference control signal is made, the interference control signal having a priority which is based on the priority of the higher one of the first priority and the second priority.