System for managing the multiple air-to-ground communications links originating from each aircraft in an air-to-ground cellular communication network

• US 7,920,860 B2
• Filed: 10/31/2006
• Issued: 04/05/2011
• Est. Priority Date: 10/31/2006
• Status: Active Grant

• Current Assignee: Gogo Business Aviation LLC (GOGO Incorporated)
• Original Assignee: Aircell LLC (GOGO Incorporated)
• Inventors: Liu, Yong, Chari, Anand K., Walsh, Patrick J., Saroka, Harold Grant, Joyce, Tim, McKenna, Daniel Bernard
• Primary Examiner(s): Hu; Jinsong
• Assistant Examiner(s): OBAYANJU, OMONIYI
• Application Number:
  US11/590,709
• Publication Number:
  US 20080102814A1
• Time in Patent Office: 1,617 Days
• Field of Search: 455/422.1, 455423-424, 455/431, 455/379, 455/63.1, 455/562.1
• US Class Current: 455/431
• CPC Class Codes: H01Q 1/283 Blade, stub antennas
• CPC Class Codes: H01Q 21/29 Combinations of different interacting antenna units for giving a desired directional characteristic H01Q25/00 takes precedence
• CPC Class Codes: H01Q 9/0435 using two feed points
• CPC Class Codes: H01Q 9/32 Vertical arrangement of element H01Q9/40 takes precedence
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity
• CPC Class Codes: H04B 7/18506 Communications with or from aircraft, i.e. aeronautical mobile service
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 84/005 Moving wireless networks

Abstract

The Multi-Link Aircraft Cellular System makes use of multiple physically separated antennas mounted on the aircraft, as well as the use of additional optional signal isolation and optimization techniques to improve the call handling capacity of the Air-To-Ground cellular communications network. These additional techniques can include polarization domain and ground antenna pattern shaping (in azimuth, in elevation, or in both planes). Further, if code domain separation is added, dramatic increases in capacity are realized. Thus, the Air-To-Ground cellular communications network can increase its capacity on a per aircraft basis by sharing its traffic load among more than one cell or sector and by making use of multiple physically separated antennas mounted on the aircraft, as well as the use of additional optional signal isolation and optimization techniques.

Claims

1. A system for managing radio frequency communications in a non-terrestrial region of space between a plurality of wireless subscriber devices located in an aircraft and a plurality of Air-To-Ground terrestrial base stations of an Air-To-Ground cellular communications network, comprising:

a plurality of Air-To-Ground terrestrial base stations of said Air-To-Ground cellular communications network for populating said non-terrestrial region of space with a plurality of multi-dimensional Radio Frequency sectors, each multi-dimensional Radio Frequency sector having a plurality of radio frequency characteristics, to exchange call traffic with an aircraft;

a plurality of independently operable radio frequency antennas mounted on the exterior surface of said aircraft;

interface, located in said aircraft, for generating radio frequency communication signals for selected ones of said plurality of independently operable antennas to establish multiple simultaneous Air-To-Ground Radio Frequency communications links to exchange call traffic between said plurality of wireless subscriber devices and a plurality of cells and sectors of said Air-To-Ground cellular communications network;

data flow controller, located in said aircraft, comprising;

traffic determination process for determining the traffic load in said aircraft,

network signaling process for receiving terrestrial network load balancing information received from said Air-To-Ground cellular communications network, and

data router, responsive to said determined traffic load and said received network traffic load balancing information, for distributing said call traffic from said plurality of wireless subscriber devices among said plurality of radio frequency antennas to simultaneously maintain multiple Air-To-Ground Radio Frequency communications links, each link serving a portion of said call traffic from said plurality of wireless subscriber devices.

2. The system for managing radio frequency communications of claim 1, said data flow controller further comprising:

pilot signal determining process, located in each of said aircraft, for measuring a pilot signal strength at each of said plurality of radio frequency antennas; and

link selector, responsive to said determined pilot signal strengths, for activating said data router to apply radio frequency signals to said selected ones of said aircraft radio frequency antennas with radio frequency signals to match said plurality of radio frequency characteristics of said corresponding multi-dimensional Radio Frequency sectors.

3. The system for managing radio frequency communications of claim 2 wherein said plurality of Air-To-Ground terrestrial base stations comprises:

sector generator for generating a pattern of radio frequency signals that divides said multi-dimensional space into multi-dimensional Radio Frequency sectors in one of azimuth, elevation, altitude, and multiple planes.

4. The system for managing radio frequency communications of claim 3 wherein said plurality of radio frequency characteristics are selected from the set of characteristics that include:

Time, Space, Code, Polarization, Antenna-Aircraft, Antenna-Ground, Frequency, Azimuth Sectoring, Elevation Sectoring, Pitch, Roll, Yaw, and Flight Speed.

5. The system for managing radio frequency communications of claim 1 wherein said plurality of Air-To-Ground terrestrial base stations comprises:

sector generator for generating a pattern of radio frequency signals that divides said multi-dimensional space into multi-dimensional Radio Frequency sectors in one of azimuth, elevation, altitude, and multiple planes.

6. The system for managing radio frequency communications of claim 1 wherein said data flow controller comprises:

logical path link for transmitting a first part of said call traffic on a first of said multiple Air-To-Ground Radio Frequency communications links and a second part of said call traffic on a second of said multiple Air-To-Ground Radio Frequency communications links, wherein individual data packets in said call traffic are not time synchronous.

7. The system for managing radio frequency communications of claim 1, said data flow controller further comprising:

pilot signal determining process, located in each of said aircraft, for measuring a pilot signal strength at each of said plurality of radio frequency antennas; and

primary link selector, responsive to said determined pilot signal strengths, for selecting a primary one of said plurality of radio frequency antennas and associated polarization that corresponds to a strongest pilot signal strength.

8. The system for managing radio frequency communications of claim 7, said data flow controller further comprising:

secondary link selector, responsive to said determined pilot signal strengths, for selecting a secondary one of said plurality of radio frequency antennas and associated polarization that corresponds to a second strongest pilot signal strength.

17. The system for managing radio frequency communications of claim 1 wherein said data router comprises:

data multiplexor for recombining data received from multiple Air-To-Ground Radio Frequency communications links into a single data flow.

18. The system for managing radio frequency communications of claim 1 wherein said data router comprises:

data multiplexor for dividing data received from a single data flow onto multiple Air-To-Ground Radio Frequency communications links.

9. A method for managing radio frequency communications in a non-terrestrial region of space between a plurality of wireless subscriber devices located in an aircraft and a plurality of Air-To-Ground terrestrial base stations of an Air-To-Ground cellular communications network, comprising:

populating, using a plurality of Air-To-Ground terrestrial base stations of said Air-To-Ground cellular communications network, said non-terrestrial region of space with a plurality of multi-dimensional Radio Frequency sectors, each multi-dimensional Radio Frequency sector having a plurality of radio frequency characteristics, to exchange call traffic with an aircraft;

operating a plurality of independently operable radio frequency antennas mounted on the exterior surface of said aircraft;

generating, in said aircraft, radio frequency communication signals for selected ones of said plurality of independently operable antennas to establish multiple simultaneous Air-To-Ground Radio Frequency communications links to exchange call traffic between said plurality of wireless subscriber devices and a plurality of cells and sectors of said Air-To-Ground cellular communications network;

controlling data flow in said aircraft, comprising;

determining the traffic load in said aircraft,

receiving terrestrial network load balancing information received from said Air-To-Ground cellular communications network, and

distributing, in each of said aircraft, responsive to said determined traffic load and said received network traffic load balancing information said call traffic from said plurality of wireless subscriber devices among said plurality of radio frequency antennas to simultaneously maintain multiple Air-To-Ground Radio Frequency communications links, each link serving a portion of said call traffic from said plurality of wireless subscriber devices.

10. The method for managing radio frequency communications of claim 9, said step of controlling data flow further comprising:

measuring, in each of said aircraft, a pilot signal strength at each of said plurality of radio frequency antennas; and

activating, in response to said determined pilot signal strengths, said step of distributing to apply radio frequency signals to said selected ones of said aircraft radio frequency antennas with radio frequency signals to match said plurality of radio frequency characteristics of said corresponding multi-dimensional Radio Frequency sectors.

11. The method for managing radio frequency communications of claim 10 wherein said step of populating comprises:

generating a pattern of radio frequency signals that divides said multi-dimensional space into multi-dimensional Radio Frequency sectors in one of azimuth, elevation, altitude, and multiple planes.

12. The method for managing radio frequency communications of claim 11 wherein said plurality of radio frequency characteristics are selected from the set of characteristics that include:

Time, Space, Code, Polarization, Antenna-Aircraft, Antenna-Ground, Frequency, Azimuth Sectoring, Elevation Sectoring, Pitch, Roll, Yaw, and Flight Speed.

13. The method for managing radio frequency communications of claim 9 wherein said step of populating comprises:

generating a pattern of radio frequency signals that divides said multi-dimensional space into multi-dimensional Radio Frequency sectors in one of azimuth, elevation, altitude, and multiple planes.

14. The method for managing radio frequency communications of claim 9, said step of distributing further comprising:

transmitting a first part of said call traffic on a first of said multiple Air-To-Ground Radio Frequency communications links and a second part of said call traffic on a second of said multiple Air-To-Ground Radio Frequency communications links, wherein individual data packets in said call traffic are not time synchronous.

15. The method for managing radio frequency communications of claim 9, said step of controlling data flow further comprising:

measuring, in each of said aircraft, a pilot signal strength at each of said plurality of radio frequency antennas; and

selecting, in response to said determined pilot signal strengths, a primary one of said plurality of radio frequency antennas and associated polarization that corresponds to a strongest pilot signal strength.

16. The method for managing radio frequency communications of claim 15, said step of controlling data flow further comprising:

selecting, in response to said determined pilot signal strengths, a secondary one of said plurality of radio frequency antennas and associated polarization that corresponds to a second strongest pilot signal strength.

19. The method for managing radio frequency communications of claim 9 wherein said step of selectively applying comprises:

recombining data received from multiple Air-To-Ground Radio Frequency communications links into a single data flow.

20. The method for managing radio frequency communications of claim 9 wherein said step of selectively applying comprises:

dividing data received from a single data flow onto multiple Air-To-Ground Radio Frequency communications links.