Dynamic beam width selection for non-uniform density multiple access cells

• US 7,194,270 B2
• Filed: 09/30/2003
• Issued: 03/20/2007
• Est. Priority Date: 10/15/1999
• Status: Expired due to Term

• Current Assignee: Northrop Grumman Systems Corporation (Northrop Grumman Corporation)
• Original Assignee: Northrop Grumman Corporation
• Inventors: Smith, Ronald P.
• Primary Examiner(s): Appiah; Charles
• Assistant Examiner(s): FOX, BRYAN J
• Application Number:
  US10/674,668
• Publication Number:
  US 20040072570A1
• Time in Patent Office: 1,267 Days
• Field of Search: 455427-430, 455/446, 455 121- 133, 342/374, 370/321, 370/322, 370/326, 370/336, 370/337, 370/347, 370/442, 370/436, 370/478, 370/339
• US Class Current: 455/446
• CPC Class Codes: H04B 7/2041 Spot beam multiple access
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 84/06 Airborne or Satellite Networks space-based or airborne stations H04B7/185

Abstract

A communications system includes an antenna that produces a series of beams which divide a service region into a plurality of contiguous cells, and dynamically modifies cell boundaries so that the system'"'"'s allocated communication spectrum is efficiently utilized.

Claims

1. A satellite-based method for rapidly altering the size of a communication cell in response to bandwidth demands, said method including:

transmitting a plurality of radio frequency (RF) beams from a satellite-based transmitter to establish a corresponding plurality of communication cells, each of the plurality of communication cells having an assignable set of communication slots capable of servicing a plurality of users in a coverage area during a frame time interval, the plurality of users including first users having a high demand and second users having a low demand, the first users assigned a first group of the assignable set of communication slots and the second users assigned a second group of the assignable set of communication slots;

establishing a first size for a first communication cell associated with one of the plurality of RF beams based on a first bandwidth demand associated with the first users;

determining a second size for said first communication cell associated with the one of the plurality of RF beams based on a second bandwidth demand associated with the second users; and

rapidly altering the size of said first communication cell from said first size to a second size during the second group of the assignable set of communication slots and from said second size to said first size during the first group of the assignable set of communication slots, by adjusting one or more beam forming parameters associated with the one of the plurality of RF beams.

2. The satellite-based method of claim 1, wherein a terminal in a communication cell adjacent to said first communication cell makes a bandwidth request,

wherein said bandwidth request has a priority level,

wherein said step of altering said size of said first communication cell is based part on said priority level.

3. The satellite-based method of claim 1, wherein said second size of said first communication cell overlaps on at least one communication cell adjacent to said first communication cell.

4. A satellite-based method for rapidly altering the size of a communication cell in response to bandwidth demands, the communication cell having an assignable set of communication slots capable of servicing a plurality of users in a coverage area during a frame time interval, the plurality of users including first users having a high demand and second users having a low demand, the first users assigned a first group of the assignable set of communication slots and the second users assigned a second group of the assignable set of communication slots, said method including:

determining a first size for the communication cell based on the high demand associated with the first users;

determining a second size for the communication cell based on the high demand of the first users and the low demand of the second users; and

rapidly altering the size of the communication cell from said first size to said second size during the second group of the assignable set of communication slots and from said second size to said first size during the first group of the assignable set of communication slots.

5. The satellite-based method of claim 4, wherein a terminal associated with one of the users in the communication cell makes a bandwidth request,

wherein said bandwidth request has a priority level,

wherein said step of rapidly altering said size of the communication cell is based in part on said priority level.

6. A satellite-based method for rapidly altering the size of a communication cell in response to bandwidth demands, the communication cell having an assignable set of communication slots capable of servicing a plurality of users in a coverage area during a frame time interval, the plurality of users including first users having a high demand and second users having a low demand, the first users assigned a first group of the assignable set of communication slots and the second users assigned a second group of the assignable set of communication slots, said method including:

determining a first size for a communication cell based on the high demand associated with the first users;

determining a second size for said communication cell based on the high demand of the first users and the low demand of the second users; and

rapidly altering the size of said communication cell from said first size to said second size during the second group of the assignable set of communication slots and from said second size to said first size during the first group of the assignable set of communication slots, said second size of said communication cell overlapping on at least one communication cell adjacent to said communication cell.

7. The satellite-based method of claim 6, wherein a terminal associated with one of the plurality of users in said communication cell makes a bandwidth request,

wherein said bandwidth request has a priority level,

wherein said altering step is based in part on said priority level.

8. A satellite-based method for rapidly altering the size of a communication cell in response to bandwidth demands, the method comprising:

transmitting a plurality of beams from a transmitter to establish a corresponding plurality of communication cells, each of the plurality of communication cells having an assignable set of communication slots capable of servicing a plurality of users in a coverage area during a frame time interval, the plurality of users including first users having a high demand and second users having a low demand, the first users assigned a first group of the assignable set of communication slots and the second users assigned a second group of the assignable set of communication slots;

establishing a first size for one of the plurality of communication cells with one of the plurality of beams based on the high demand associated with the first users;

determining a second size for the one of the plurality of communication cells based on the high demand associated with the first users and the low demand associated with the second users; and

rapidly altering the size of the one of the plurality of communication cells during the frame time interval from the first size to the second size during the second group of the assignable set of communication slots and from the second size to the first size during the first group of the assignable set of communication slots by adjusting the one of the plurality of beams.

9. The satellite-based method according to claim 8, wherein the assignable set of communication slots is associated with a frequency division multiple access (FDMA) communication protocol.

10. The satellite-based method according to claim 8, wherein the assignable set of communication slots is associated with a time division multiple access (TDMA) communication protocol.

11. A satellite-based method for rapidly altering the size of a communication cell in response to bandwidth demands, the communication cell having an assignable set of communication slots capable of servicing a plurality of users in a coverage area during a frame time interval, the plurality of users including first users having a high demand and second users having a low demand, the first users assigned a first group of the assignable set of communication slots and the second users assigned a second group of the assignable set of communication slots, the method comprising:

determining a first size and a first downlink power level for the communication cell based on the high demand associated with the first users;

determining a second size and a second downlink power level for the communication cell based on the high demand of the first users and the low demand of the second users; and

rapidly altering the size and a downlink power level of the communication cell from the first size and the first downlink power level to the second size and the second downlink power level during the second group of the assignable set of communication slots and from the second size and the second downlink power level to the first size and the first downlink power level during the first group of the assignable set of communication slots.

12. The satellite-based method according to claim 11, wherein the assignable set of communication slots is associated with a frequency division multiple access (FDMA) communication protocol.

13. The satellite-based method according to claim 11, wherein the assignable set of communication slots is associated with a time division multiple access (TDMA) communication protocol.