Dynamic transmission control for a wireless network

• US 9,084,276 B2
• Filed: 09/09/2010
• Issued: 07/14/2015
• Est. Priority Date: 09/11/2009
• Status: Active Grant

• Current Assignee: Aerovironment
• Original Assignee: Aerovironment
• Inventors: Grabowsky, John F., Tokumaru, Phillip T., Kniskern, Robert J., Currens, Nicholas S., Levine, Allan L. Jr.
• Primary Examiner(s): Wang, Fanghwa
• Application Number:
  US12/878,989
• Publication Number:
  US 20110065469A1
• Time in Patent Office: 1,769 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04B 7/18504 Aircraft used as relay or high altitude atmospheric platform
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
• CPC Class Codes: H04W 28/20 Negotiating bandwidth
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/543 based on requested quality, e.g. QoS
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user

Abstract

In one possible embodiment, a wireless network with dynamic transmission control is provided that includes a multiple of nodes. The nodes include an arbiter and multiple client nodes. The arbiter is configured to control an operation of the client nodes by defining communications operation cycles and allocating a bandwidth to each of the client nodes on a cycle by cycle basis in response to requests for bandwidth from the client nodes.

Claims

1. A wireless network with dynamic transmission control comprising a dynamic arbiter and a plurality of client nodes, the arbiter being configured to control an operation of the client nodes by defining communications operation cycles and allocating a bandwidth to each of the plurality of client nodes on a cycle by cycle basis in response to requests for bandwidth from the plurality of client nodes, wherein the arbiter is configured to vary the operation cycles based on the requests for bandwidth, and wherein the arbiter is further configured to define a duration of an operation cycle by varying a frame length in response to requests for bandwidth from the plurality of client nodes and to begin a new frame if a client node does not need an entire slot, and wherein the arbiter comprises an unmanned aerial vehicle configured to monitor for an existing DDL session upon power up and assume the role of arbiter when no DDL session is in progress and the plurality of client nodes comprise ground station, such that the unmanned aerial vehicle dynamically controls an operation of the plurality of client nodes by defining communications operation cycles and allocating a bandwidth to each of the plurality of client nodes on a cycle by cycle basis in response to requests for bandwidth from the plurality of client nodes, and by varying the operation cycles based on the requests for bandwidth, and by defining the duration of an operation cycle by varying the frame length in response to requests for bandwidth from the plurality of client nodes, and by beginning a new frame if a client node does not need an entire slot.

2. The wireless network of claim 1, wherein the unmanned aerial vehicle is configured to prioritize the requests for bandwidth from the plurality of client nodes and to allocate bandwidth in an operation cycle based on a priority of each request.

3. The wireless network of claim 1, wherein the unmanned aerial vehicle is configured to relinquish control as session arbiter to another node upon request.

4. The wireless network of claim 3, wherein the unmanned aerial vehicle is configured to transmit an arbiter table upon request prior to relinquishing control as session arbiter.

5. The wireless network of claim 1, wherein each operation cycle is divided up into a set of time segments, and wherein allocating the bandwidth comprises assigning a transmission start time and a transmission duration for each of the plurality of client nodes requesting bandwidth and changing the transmission start time and the transmission duration for each of the plurality of client nodes requesting bandwidth in response to the requests for bandwidth from the plurality of client nodes.

6. The wireless network of claim 1, wherein the plurality of client nodes comprise a plurality of unmanned vehicles.

7. The wireless network of claim 1, wherein the plurality of client nodes further comprise an unmanned vehicle.

8. The wireless network of claim 1, wherein the unmanned aerial vehicle is configured such that allocating the bandwidth comprises assigning a transmission start time and a transmission duration to the plurality of client nodes and changing the transmission start time and the transmission duration for the plurality of client nodes in response to requests from the plurality of client nodes.

9. The wireless network of claim 1, wherein the unmanned aerial vehicle is configured such that assigning the bandwidth comprises assigning the bandwidth in response to an operator.

10. The wireless network of claim 9, wherein the unmanned aerial vehicle is configured such that assigning the bandwidth comprises controlling the video quality transmit by each of the plurality of client nodes.

11. The wireless network of claim 10 wherein the unmanned aerial vehicle is configured such that assigning the bandwidth comprises allocating bandwidth for at least one of:

a) full video;

b) degraded video;

c) still pictures;

or d) no video imagery for a client node requesting bandwidth.

12. The wireless network of claim 1, wherein the nodes comprise transceivers controlled by an operating system.

27. The wireless network of claim 1, wherein the unmanned aerial vehicle is configured to relay data between at least two non-arbiter nodes.

13. A method for communicating on a wireless network having a plurality of nodes, the method comprising:

selecting a node to function as a dynamic arbiter for dynamically controlling communication of at least one non-arbiter node of the plurality of nodes on the wireless network, wherein selecting a node comprises selecting an unmanned aerial vehicle as the arbiter such that the unmanned aerial vehicle dynamically controls an operation of the at least one non-arbiter nodes by defining communications operation cycles and allocating a bandwidth to the at least one non-arbiter nodes on a cycle by cycle basis in response to requests for bandwidth from the at least one non-arbiter nodes, and by varying the operation cycles based on the requests for bandwidth from the at least one non-arbiter nodes, and by defining the duration of an operation cycle by varying the frame length in response to requests for bandwidth from the at least one non-arbiter nodes and by beginning a new frame if a non-arbiter node does not need an entire slot;

receiving at the unmanned aerial vehicle requests for a desired bandwidth from the at least one non-arbiter node;

adjusting dynamically the bandwidth allocated to the at least one non-arbiter node based on the requests, comprising using the unmanned aerial vehicle to define operation cycles and assign a transmission start time and duration for each cycle to the at least one non-arbiter node;

wherein using the unmanned aerial vehicle to define further comprises defining a duration of an operation cycle by varying a frame length in response to requests for bandwidth from the at least one client nodes and to begin a new frame if a client node does not need an entire slot; and

wherein selecting a node to function as an arbiter comprises powering up the unmanned aerial vehicle and monitoring for an existing DDL session and assuming the role of arbiter if no DDL session is in progress.

14. The method of claim 13, wherein monitoring for an existing DDL session comprises monitoring within a channel, and wherein assuming the role of arbiter comprises initiating a DDL session within the channel if no DDL session is detected within the channel.

15. The method of claim 13, wherein receiving requests comprises receiving an initial request for the desired bandwidth allocation from a non-arbiter node and granting bandwidth allocation in response to the initial request to allow the requesting non-arbiter node to join a DDL session.

16. The method of claim 15, wherein the non-arbiter node is a ground unit, and further comprising receiving vehicle control commands for the unmanned aerial vehicle from the non-arbiter node and maneuvering the arbiter according to the vehicle control commands from the non-arbiter node.

17. The method of claim 15, wherein the arbiter is a first unmanned aerial vehicle and the non-arbiter node is a ground unit, and further comprising receiving vehicle control commands for a second unmanned vehicle from the non-arbiter node and passing the vehicle control commands to the second unmanned vehicle.

18. The method of claim 13, wherein selecting a node to function as an arbiter comprises transferring duties of the arbiter to a non-arbiter node to provide a new arbiter for the session.

19. The method of claim 18, wherein transferring the duties to the new arbiter is in response to a request from the non-arbiter node.

20. The method of claim 13, further comprising relaying data between at least two non-arbiter nodes using the unmanned aerial vehicle arbiter.

21. The method of claim 20, wherein relaying data between at least two non-arbiter nodes comprises relaying data comprising at least one of:

(a) vehicle controls;

(b) video, (c) other sensor or sensor derived data;

(d) voice;

(e) instant messaging;

or (f) mission information.

22. The method of claim 21, wherein adjusting the bandwidth further comprises prioritizing the data for relaying and controlling the flow of the data based on a priority of the data.

23. The method of claim 21, wherein adjusting the bandwidth further comprises prioritizing requests for bandwidth and allocating bandwidth in an operation cycle based on a priority of the data.

24. The method of claim 13, wherein adjusting the bandwidth further comprises prioritizing requests for bandwidth and allocating bandwidth in an operation cycle based on a priority of each request.

25. The method of claim 13, wherein adjusting the bandwidth comprises using the arbiter to define the operation cycles comprising dividing the operation cycles into a set of time segments and assigning to the at least one non-arbiter node in the wireless network a starting time segment and a number of time segments.

26. The method of claim 13, wherein the at least one non-arbiter node comprises multiple non-arbiter nodes such that selecting comprises selecting a node to function as an arbiter for controlling communication on the wireless network of the multiple non-arbiter nodes, and receiving comprises receiving at the arbiter requests for a desired bandwidth from the multiple non-arbiter nodes, and adjusting comprises adjusting dynamically the bandwidth allocated to the multiple non-arbiter nodes based on the requests, comprising using the arbiter to define operation cycles and assign a transmission start time and duration to each cycle of each of the multiple non-arbiter nodes.

28. The method of claim 13 further comprising receiving vehicle control commands for the unmanned aerial vehicle arbiter from the non-arbiter node and maneuvering the unmanned aerial vehicle arbiter according to the vehicle control commands from the non-arbiter node.

29. The method of claim 20, wherein relaying data between at least two non-arbiter nodes using the unmanned aerial vehicle arbiter comprises relaying vehicle control data from one non-arbiter node to another non-arbiter node.