 |
|
|
|
|
|
 Title: |
US6311075:
Antenna and antenna operation method for a cellular radio communications system
[ Derwent Title ]
|
| Country: |
US United States of America
|
| |
| Inventor: |
Bevan, David Damian Nicholas; Bishops Stortford, United Kingdom
Baines, Steven John; Stansted Mountfichet, United Kingdom
|
| Assignee: |
Northern Telecom Limited, Montreal, Canada
other patents from NORTHERN TELECOM LIMITED (408420) (approx. 2,538)
News, Profiles, Stocks and More about this company
|
| Published / Filed: |
2001-10-30
/ 1998-11-24
|
| Application Number: |
US1998000198385
|
| IPC Code: |
Advanced:
H01Q 1/24;
H01Q 21/29;
Core:
H01Q 21/00;
more...
IPC-7:
H04B 1/38;
|
| ECLA Code: |
H01Q1/24A3; H01Q21/29;
|
| U.S. Class: |
Current:
455/562.1;
342/368;
343/879;
343/891;
455/025;
455/446;
455/522;
Original:
455/562;
455/522;
455/446;
455/025;
343/879;
343/891;
342/368;
|
| Field of Search: |
455/446,25,561-562,129,272,522,69-70
343/874,875,879,890-891
342/368
|
| Priority Number: |
| 1998-11-24 |
US1998000198385 |
|
| Abstract: |
A conventional antenna 114 at a cell site of a sectored cell in a cellular radio communications system has a low angle of coverage in elevation and therefore has low gain for close-in subscriber units (near the cell site). In a sectored cell, a main beam antenna in a first sector generates sidelobes and backlobes which may fall within the close-in area in other sectors. A close-in mobile in one of the other sectors may move into such an out-of-sector lobe and cause unexpected interference to the base station transceiver (BTS) of the first sector. A downward-looking antenna (DIA) 110 supplements the conventional antenna in each sector and has a beam 112 covering the close-in area. The gain of the DLA beam is greater than that of any out-of-sector lobes and so provides a subscriber unit with a higher gain link to the BTS of its own sector than is provided by out-of-sector lobes to the BTS of any other sector.
|
| Primary / Asst. Examiners: |
To, Doris H.;
|
| INPADOC Legal Status: |
Show legal status actions
|
| Family: |
None
|
First Claim:
Show all 25 claims |
What is claimed is:
1. An antenna for a sectored cell of a cellular radio communications system, being a third antenna of said cell, in which said cell has a cell site comprising;
- a first antenna for generating a first principal beam for radio communication to and/or from subscriber units located in a first sector of said cell; and
- a second antenna for generating a second principal beam for radio communication to and/or from subscriber units located in a second sector of said cell, said second principal beam having a sidelobe or backlobe which has a beam gain and falls within said first sector below a predetermined angle of elevation;
- in which said third antenna is a downward-looking antenna (DLA) located at said cell site, for generating a DLA beam having coverage in azimuth corresponding to said first sector, coverage in elevation substantially below said predetermined angle of elevation, and a beam gain greater than said beam gain of said sidelobe or backlobe;
- and in which said third antenna enables power control of radio transmissions from subscriber units communicating with said first antenna and positioned within said DLA coverage area.
|
| Background / Summary: |
Show background / summary
|
| Drawing Descriptions: |
Show drawing descriptions
|
| Description: |
Show description
|
| Forward References: |
Show 24 U.S. patent(s) that reference this one
|
