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| Selective calling receiver having an alerting time auto-control function |
| An object of the present invention is to provide a selective calling receiver having an alerting ... |
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| FIG. 1 illustrates one embodiment of a system arranged in accordance with our invention, by which ... |
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| Automatic telephone silencer |
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| Method and apparatus for subscriber line to telephone call distribution |
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| Mobile communication terminal and information display method thereof |
| An object of the present invention is to provide a mobile communication terminal capable of ... |
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| Efficient paging system with sleep mode duration determined by the guaranteed number of repeats |
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Antenna apparatus for base station and method of optimizing traffic capacity in CDMA communications system
| Details |
Inventors: Mori, Shinichi; Imai, Tetsuro;
Assignee: NTT DoCoMo, Inc. (Tokyo, JP)
Primary Examiner: Feild; Joseph
Assistant Examiner: Lam; Dung
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
An antenna apparatus is installed in a base station in a code division multiple access communication system. The antenna apparatus comprises a plurality of antenna elements, each receiving a radio signal; a controller that produces an antenna control signal based on information contained in the radio signal received at each of the antenna elements; an adjusting unit that adjusts directivity characteristics of each of the antenna elements based on the antenna control signal; and an allocating unit that allocates the antenna elements to sectors based on the antenna control signal. The sector covers a portion of a cell controlled by the base station, and the number of sectors in the cell is variable by means of the antenna control signal. |
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DETAILED DESCRIPTION Therefore, it is an object of the present invention to optimize the traffic capacity of the cell or the sector, flexibly responding to the change in the communication environment.
To achieve the object, the configuration of the antenna array is automatically switched so as to be suitable for the cell sectoring technique or the adaptive antenna array technique, taking into account the transmission environment (including the signal arrival direction) and the transmission types existing in the service area.
This arrangement can guarantee the optimum traffic capacity even if the transmission environment or variation in transmission qualities changes.
In one aspect of the invention, an antenna apparatus installed in a base station in a code division multiple access communication system is provided.
The antenna apparatus comprises (a) a plurality of antenna elements, each receiving a radio signal, (b) a controller that produces an antenna control signal based on information contained in the radio signal received at each of the antenna elements, (c) an adjusting unit that adjusts directivity characteristics of each of the antenna elements based on the antenna control signal, and (d) an allocating unit that allocates each of the antenna elements to a sector based on the antenna control signal, the sector covering a portion of a cell controlled by the base station, and the number of sectors in the cell being variable by means of the antenna control signal.
This arrangement allows the directivity characteristics of the antenna element to be appropriately changed, while the number of sectors and allocation of the antenna elements are adjusted, in response to the change in the communication environment.
Consequently, the traffic capacity can be optimized.
The antenna elements are arranged in an antenna array.
The configuration of the antenna array can be changed by adjusting the directivity characteristics (such as the beam width and the main beam orientation) of each antenna element and the number of sectors, without changing the positions of the antenna elements in the array
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