Antenna apparatus for base station and operation method therefor

Abstract

An antenna apparatus for base station (BS) having at least one cell, includes: two or more antenna units to form antenna beams based on predetermined vertical tilting angles for each of two or more different frequency bands with respect to the cell; and a tilting angle control unit to control vertical tilting angles designated to the two or more antenna units, respectively, to be different from each other, so as to make coverages of the antenna beams of the two or more different frequency bands formed by the two or more antenna units different from each other with respect to the cell.

What is claimed is: 
     
         1 . An antenna apparatus for base station (BS) having at least one cell, the antenna apparatus comprising:
 two or more antenna units configured to form antenna beams based on predetermined vertical tilting angles for each of two or more different frequency bands with respect to the cell; and   a tilting angle control unit configured to control vertical tilting angles designated to the two or more antenna units, respectively, to be different from each other, so as to make coverages of the antenna beams of the two or more different frequency bands formed by the two or more antenna units different from each other with respect to the cell.   
     
     
         2 . The antenna apparatus of  claim 1 , further comprising:
 an adjacent cell identification unit configured to identify adjacent cells neighboring to the cell,   wherein the tilting angle control unit is configured to control the vertical tilting angles designated to the two or more antenna units such that the coverages of the antenna beams for the two or more frequency bands do not overlap coverages of antenna beams of equal frequency bands formed in at least one of the adjacent cells.   
     
     
         3 . The antenna apparatus of  claim 2 , wherein the tilting angle control unit is configured to control a vertical tilting angle of a first antenna unit of the two or more antenna units to be different from a vertical tilting angle of a second antenna unit of the two or more antenna units, the second antenna unit forming an antenna beam of a particular frequency band equal to that of the first antenna unit in the one or more adjacent cells. 
     
     
         4 . The antenna apparatus of  claim 3 , further comprising:
 an adjacent cell grouping unit configured to group the adjacent cells with respect to the cell into an adjacent cell group,   wherein the tilting angle control unit is configured to   identify a vertical tilting angle most frequently designated to the particular frequency band in the adjacent cell group based on the vertical tilting angle of the first antenna unit or the second antenna unit forming the antenna beam of the particular frequency band in each of adjacent cells in the adjacent cell group, and   control the vertical tilting angle of the first antenna unit to be different from the identified vertical tilting angle.   
     
     
         5 . The antenna apparatus of  claim 1 , further comprising:
 a scheduling unit configured to sequentially perform radio resource scheduling in an order from a frequency band of an antenna unit having a largest vertical tilting angle to a frequency band of an antenna unit having a smallest vertical tilting angle among the two or more different frequency bands based on the vertical tilting angles designated to the two or more antenna units.   
     
     
         6 . A method of operating an antenna apparatus for base station (BS) having at least one cell, the method comprising:
 identifying two or more antenna units for forming antenna beams based on predetermined vertical tilting angles for each of two or more different frequency bands with respect to the cell; and   controlling vertical tilting angles designated to the two or more antenna units, respectively, to be different from each other, so as to make coverages of antenna beams of the two or more different frequency bands formed by the two or more antenna units different from each other with respect to the cell.   
     
     
         7 . The method of  claim 6 , further comprising
 identifying adjacent cells neighboring to the cell,   wherein the controlling of the vertical tilting angles comprises controlling the vertical tilting angles designated to the two or more antenna units such that the coverages of the antenna beams for the two or more frequency bands do not overlap coverages of antenna beams of equal frequency bands formed in one or more of the adjacent cells.   
     
     
         8 . The method of  claim 7 , wherein the controlling of the vertical tilting angles comprises
 controlling a vertical tilting angle of a particular antenna unit of the two or more antenna units to be different from a vertical tilting angle of an antenna unit forming an antenna beam of a frequency band equal to that of the particular antenna unit in the one or more adjacent cells.   
     
     
         9 . The method of  claim 8 , further comprising
 grouping the adjacent cells of the cell,   wherein the controlling of the vertical tilting angles comprising   identifying a vertical tilting angle most frequently designated to the particular frequency band in the adjacent cell group based on the vertical tilting angle of the antenna unit forming the antenna beam of the particular frequency band in each of adjacent cells in the adjacent cell group, and   controlling the vertical tilting angle of the particular antenna unit to be different from the identified vertical tilting angle.   
     
     
         10 . The method of  claim 6 , further comprising
 sequentially performing radio resource scheduling in an order from a frequency band of an antenna unit having a largest vertical tilting angle to a frequency band of an antenna unit having to a smallest vertical tilting angle among the two or more frequency bands based on the vertical tilting angles designated to the two or more antenna units.