Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2003-02-20
2009-08-04
Tran, CongVan (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S456200, C455S450000, C342S147000, C342S368000
Reexamination Certificate
active
07570957
ABSTRACT:
An object is to implement transmission by an appropriate transmission method according to a type of information even in application of directional beam transmission. A transmission control apparatus12for transmitting information by radio communication toward a mobile station located in a predetermined sector is provided with a selector12B for selecting a transmission method according to a type of information to be transmitted, out of two or more options selected from omnisector transmission of transmitting the information toward the entire sector, fixedly controlled directional beam transmission of transmitting the information in at least one fixed direction preliminarily determined, and adaptively controlled directional beam transmission of adaptively controlling a transmission direction according to a location of a target mobile station; pilot symbol generators12C,12E,12G for generating respective pilot signals according to associated transmission methods; and transmitters12D,12F,12H each transmitting a signal in which a pilot signal is superimposed on the information to be transmitted, by the selected transmission method.
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A. Harada, et al., “Performance of Adaptive Antenna Array Diversity Transmitter for W-CDMA Forward Link”, Wireless Research Laboratories, NTT Mobile Communications Network, Inc., 5 pages.
Abeta Sadayuki
Atarashi Hiroyuki
Sawahashi Mamoru
NTT DoCoMo Inc.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Tran CongVan
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