Dynamic load sharing system and method using a cylindrical antenna array

• US 6,400,335 B1
• Filed: 08/09/2000
• Issued: 06/04/2002
• Est. Priority Date: 08/09/2000
• Status: Expired due to Term

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Weaver, Carl Francis, Wu, Xiao Cheng
• Primary Examiner(s): Ho, Tan
• Assistant Examiner(s): Clinger, James
• Application Number:
  US09/635,980
• Time in Patent Office: 664 Days
• Field of Search: 343/853, 343/893, 343/890, 370/335, 370/342, 370/500, 342/374, 342/372, 342/375
• US Class Current: 343/853
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 21/205 providing an omnidirectional coverage turnstile aerials H01Q21/26
• CPC Class Codes: H01Q 3/24 varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
• CPC Class Codes: H01Q 3/26 varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture H01Q3/12, H01Q3/22, H01Q3/24 take precedence
• CPC Class Codes: H04W 16/06 Hybrid resource partitioning, e.g. channel borrowing
• CPC Class Codes: H04W 16/24 Cell structures

Abstract

Antenna components of a cylindrical antenna array are adjusted, to dynamically share loads among sectors of a cell or between cells. The antenna components are adjusted based on beam configuration and/or orientation for example, depending upon a monitored load, to thereby vary antenna coverage areas to adjust for varying traffic densities. Antenna components are adjusted to accommodate load variations within a cell, and/or between cells.

Claims

1. An antenna system comprising:

a cylindrical antenna array; and

a controller, for adjusting antenna component configuration of the cylindrical antenna array based upon a load on the antenna components of the cylindrical antenna array.

2. The antenna system of claim 1, wherein the controller adjusts beam configuration of at least two antenna components of the cylindrical antenna array based on respective loads.

3. The antenna system of claim 2, wherein the controller adjusts beam configuration by relatively narrowing beam width of one antenna component of the cylindrical antenna array upon its respective load being relatively heavy and by relatively widening beam width of another antenna component of the cylindrical antenna array upon its respective load being relatively light.

4. The antenna system of claim 1, wherein the antenna system is used in a wireless communication system and the load is a wireless communication call handling load.

5. The antenna system of claim 1, wherein the controller adjusts beam orientation of at least two antenna components of the cylindrical antenna array based on respective loads.

6. The antenna system of claim 5, wherein the controller adjusts beam orientation by changing an azimuth angle of at least two antenna components of the cylindrical antenna array.

7. The antenna system of claim 1, wherein the controller adjusts the number of antenna components of the cylindrical antenna array based on load.

8. The antenna system of claim 1, wherein the load is determined based on a ratio of pilot power to total transmit power.

9. The antenna system of claim 1, wherein the load is remotely monitored and used to determine antenna component configuration adjustments, the controller being remotely controlled to adjust antenna component configuration.

10. The antenna system of claim 1, further comprising:

at least one additional cylindrical antenna array, wherein the loads of each of the at least two cylindrical antenna arrays are monitored to determine antenna component configuration adjustments of at least one antenna component of the cylindrical antenna arrays based upon the monitored loads.

11. The antenna system of claim 10, wherein the controller adjusts beam configuration by relatively narrowing beam width of at least one cylindrical antenna array upon its respective load being relatively heavy and adjusts beam configuration by relatively widening beam width of at least one other cylindrical antenna array upon its respective load being relatively light.

12. The antenna system of claim 10, wherein the antenna system is used in a wireless communication system and the load is a wireless communication call handling load.

13. The antenna system of claim 12, wherein the at least two cylindrical antenna arrays service the same cell.

14. The antenna system of claim 10, wherein a first controller adjusts beam orientation by down-tilting the beam of at least one cylindrical antenna array upon its respective load being relatively heavy and a second controller adjusts beam orientation by up-tilting the beam of at least one other cylindrical antenna array upon its respective load being relatively light.

15. The antenna system of claim 14, wherein the first and second controllers are controlled by a third common controller.

16. The antenna system of claim 14, wherein the antenna system is used in a wireless communication system and the load is a wireless communication call handling load.

17. The antenna system of claim 16, wherein at least one cylindrical antenna array services a first cell and at least one other cylindrical antenna array services a second neighboring cell.

18. The antenna system of claim 8, wherein a first controller adjusts antenna component configuration of a first cylindrical antenna array in a first cell and a second controller adjusts antenna component configuration of a second cylindrical antenna array in a second cell, each of the first and second controllers being operatively connected to a third controller.

19. The antenna system of claim 1, comprising:

two additional cylindrical antenna arrays, wherein loads of all three cylindrical antenna arrays are monitored to dynamically determine antenna component configuration adjustments of at least one antenna component of the cylindrical antenna arrays based upon the monitored loads.

20. The antenna system of claim 19, wherein the antenna system is used in a cell of a wireless communication system and the cylindrical antenna arrays operate to handle wireless communication calls.

21. A method for adjusting antenna components of a cylindrical antenna array to redistribute load, comprising:

providing a cylindrical antenna array, including a plurality of antenna components, in a wireless communication system; and

adjusting antenna component configuration of the cylindrical array based upon adjustments determined from load on the antenna components of the cylindrical antenna array.

22. The method of claim 21, wherein load is determined based on a ratio of pilot power to total transmit power.

23. The method of claim 22, wherein the step of adjusting includes:

adjusting beam configuration of at least two antenna components of the cylindrical antenna array based upon respective loads.

24. The method of claim 23, wherein the step of adjusting includes:

adjusting beam configuration by relatively narrowing beam width of one antenna component of the cylindrical antenna array upon its respective load being relatively heavy, and

adjusting beam width configuration by relatively widening beam width of another antenna component of the cylindrical antenna array upon its respective load being relatively light.

25. The method of claim 21, wherein the step of adjusting includes:

adjusting beam orientation of at least two antenna components of the cylindrical antenna array based upon their respective loads.

26. The method of claim 25, wherein the step of adjusting includes:

adjusting beam orientation by changing an azimuth angle of at least two antenna components the cylindrical antenna array based upon respective loads.

27. The method of claim 21, wherein the step of adjusting includes:

adjusting the number of antenna components of the cylindrical antenna array based upon the load.

28. The method of claim 21, wherein antenna component configuration adjustments are determined from monitored loads of a plurality of cylindrical antenna arrays in a common. cell.

29. The method of claim 28, wherein beam configuration of at least one cylindrical antenna array is relatively narrowed upon its respective load being relatively heavy and beam configuration of at least one cylindrical antenna array is relatively widened upon its respective load being relatively light.

30. The method of claim 21, wherein antenna component configuration adjustments are determined from monitored loads of a plurality of cylindrical antenna arrays in neighboring cells.

31. The method of claim 30, wherein the step of adjusting includes down-tilting a beam of at least one antenna component of at least one cylindrical antenna array in one cell upon its respective load being relatively heavy and up-tilting a beam of at least one antenna component of at least one other cylindrical antenna array in a neighboring cell upon its respective load being relatively light.

32. The method of claim 31, wherein the load is a wireless communication call handling load.

33. The method of claim 30, wherein the load is determined based on a ratio of pilot power to total transmit power.