Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1998-05-13
2000-09-12
Bost, Dwayne D.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455561, 455442, 370331, H04Q 720
Patent
active
061190047
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a base station apparatus in a mobile communication in which transmission and reception are executed by sector, preferably to a base station apparatus in a mobile communication to reduce the scale of the hardware of a base station and improve the communication quality.
BACKGROUND ART
As a mobile communication technique in a cellar system, a sector transmission and reception method, in which a base station has a plurality of base station antennas composed of directive antennas and each of a plurality of cells comprises a plurality of sectors where a different frequency is used for each sector to communicate, has been developed.
The sector transmission and reception method allows to use the same frequency repeatedly in nearer cells, which makes the efficiency of frequency reuse higher and increases the number of users accommodated.
In the sector transmission and reception method described above, when a mobile station in communication moves from a cell to another cell, a handover between cells by a switching equipment is executed. And when a mobile station cross a boundary between sectors, a handover between sectors by controlling of a base station is executed.
For instance, In Japanese Unexamined Patent publication No.7-131845, a base station apparatus for executing sector-transmitting-receiving is described. The base station apparatus is to execute data communication on the basis of CDMA (Code Division Multiple Access) mobile communication system. Illustrated in FIG. 6, the base station apparatus described above comprises M numbers (M is an integer number indicating the number of cells) of sector antenna 303, M numbers of batch modulating/demodulating section 302-1 through 302-M to modulate and demodulate transmission and reception signals by a plurality of communication channels in the batch in a frequency determined for each sector and N numbers (N is an integer number indicating the numbers of communication channels) of baseband signal processing section 301-1 though 301-N to process baseband signals of each communication channel. In addition, in FIG. 6, CLK illustrates a clock signal to operate each circuit.
As illustrated in FIG. 7, each of baseband signal processing section 301-1 through 301-N comprises transmission signal processing section 201 to generate transmission signal Sn corresponding to a modulation method from transmission data SDn, transmission signal selecting circuit 202 to output this transmission data Sn to the instructed sector, reception signal selecting circuit 204 to select signal RAm(m=1.about.M) received by each sector according to an instruction, reception signal selecting processing section 203 to detect reception data RDn corresponding to the communication channel from selected reception signal Rn, monitor signal selecting circuit 206 to select signal Am received at each sector according to an instruction to output, reception quality monitoring section 205 to monitor the reception quality of the reception signal selected by monitor signal selecting circuit 206, and control section 207 to instruct monitor signal selecting circuit 206 to switch a sector to be selected at a certain time intervals, and to instruct transmission signal selecting circuit 202 and reception signal selecting circuit 204 to select a sector having the most appreciate reception quality on the basis of the detection result by reception quality monitoring section 205.
In the base station transmitting and receiving apparatus, transmission data SDn (n=1.about.N) of the number n channel is input to transmission signal processing section 201 at the number n of baseband signal processing section 301-n. Transmission signal processing section 201 generates transmission signal Sn corresponding to a modulation method from this transmission data SDn. This transmission signal Sn is input into transmission signal selecting circuit 202. Transmission signal selecting circuit 202 outputs this transmission signal Sn [Sn,m=Sn(m=SEL1), Sn,m=0(m.noteq.SEL1)] to a sector instr
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Horikawa Izumi
Yamada Daisuke
Bost Dwayne D.
Legree Tracy M.
Matsushita Electric - Industrial Co., Ltd.
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