Patents by Inventor Shinji Uebayashi
Shinji Uebayashi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8649742Abstract: A radio communication system according to the present invention includes a scatterer configured to reflect, refract, or transmit a radio wave radiated primarily from a transmission side apparatus to radiate the radio wave secondarily to a desired area and a metamaterial is used for the scatterer.Type: GrantFiled: November 28, 2008Date of Patent: February 11, 2014Assignee: NTT DoCoMo, Inc.Inventors: Tamami Maruyama, Shinji Uebayashi, Tatsuo Furuno
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Patent number: 8390531Abstract: A reflect array (1) according to the present invention includes a plurality of array elements (10) forming an array configured to control a direction of a reflected wave (scattered wave) by controlling a phase of the reflected wave; and a ground plane (30). The ground plane (30) has a structure with a frequency selective function.Type: GrantFiled: September 30, 2009Date of Patent: March 5, 2013Assignee: NTT DoCoMo, Inc.Inventors: Tamami Maruyama, Shinji Uebayashi, Tatsuo Furuno, Long Li, Qiang Chen, Qiaowei Yuan, Kunio Sawaya
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Patent number: 8289220Abstract: The present invention relates to a radio communication system configured to secondarily-radiate, to a desired area by reflection, primarily-radiated radio waves from a transmitter apparatus, by using a reflector plate for controlling phases of reflected waves, wherein a reflecting property of the reflector plate is set so that the reflector plate reflects the primarily-radiated radio waves as plane waves of equal phase directed to a direction different from a reflection angle in the case of specular reflection.Type: GrantFiled: September 1, 2009Date of Patent: October 16, 2012Assignee: NTT DoCoMo, Inc.Inventors: Tamami Maruyama, Shinji Uebayashi, Tatsuo Furuno
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Publication number: 20120105305Abstract: A reflectarray according to the present invention formed by arranging a plurality of mushroom structures on a ground plane and each of the mushroom structures is formed by one quadrilateral patch and a via configured to short the patch and the ground plane. The adjacent vias are arranged to have equal intervals in a vertical direction of the ground plane. A size of each gap between the adjacent patches is adjusted so that a value of a reflection phase of a reflected wave from can of the patches is set to a desired value.Type: ApplicationFiled: May 28, 2010Publication date: May 3, 2012Applicant: NTT DOCOMO, INC.Inventors: Tamami Maruyama, Tatsuo Furuno, Tomoyuki Ohya, Shinji Uebayashi, Koji Isshiki
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Patent number: 7957730Abstract: A weighting parameter estimation system for estimating a weight parameter for the antenna elements of a mobile terminal is provided. The system includes a prohibited space forming part to which electromagnetic waves should not be directed when the mobile terminal transmits a signal in wireless communications, and a weighting parameter determination unit configured to determine the weighting parameter for each of the antenna elements of the mobile terminal such that the power level of a test wave transmitted from or received in the prohibited space becomes the minimum.Type: GrantFiled: November 9, 2004Date of Patent: June 7, 2011Assignee: NTT DoCoMo, Inc.Inventors: Ryo Yamaguchi, Shin Nakamatsu, Shinji Uebayashi
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Patent number: 7944893Abstract: A signal transmission method checks, when detecting an occurrence of a communication request, whether the communication request is a high speed communication (step S302). In the case of the high speed communication, it checks whether the number of current high speed communications (m) plus one is greater than the upper limit (mmax) of the high speed communication (step S312). If greater, it cancels the request as a call loss (S316), and sets to a variable a the ratio (h) of the rate of the high speed communication to that of a low speed communication. If the communication request is the low speed communication, it sets one to the variable a (step S304). It compares n plus a with nmax (step S306), where n is the total number of all the current communications, a is the value associated with the communication request, and nmax is the upper limit of the number of communications acceptable in a bandwidth, all of which are expressed in terms of the number of the low speed communications.Type: GrantFiled: December 11, 2008Date of Patent: May 17, 2011Assignee: NTT DoCoMo, Inc.Inventors: Shinji Uebayashi, Seizo Onoe, Minami Ishii, Takehiro Nakamura
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Publication number: 20110045764Abstract: A radio communication system according to the present invention includes a scatterer configured to reflect, refract, or transmit a radio wave radiated primarily from a transmission side apparatus to radiate the radio wave secondarily to a desired area and a metamaterial is used for the scatterer.Type: ApplicationFiled: November 28, 2008Publication date: February 24, 2011Applicant: NTT DOCOMO, INC.Inventors: Tamami Maruyama, Shinji Uebayashi, Tatsuo Furuno
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Publication number: 20100220036Abstract: A reflect array (1) according to the present invention includes a plurality of array elements (10) forming an array configured to control a direction of a reflected wave (scattered wave) by controlling a phase of the reflected wave; and a ground plane (30). The ground plane (30) has a structure with a frequency selective function.Type: ApplicationFiled: September 30, 2009Publication date: September 2, 2010Applicant: NTT DoCoMo, Inc.Inventors: Tamami MARUYAMA, Shinji UEBAYASHI, Tatsuo FURUNO, Long LI, Qiang CHEN, Qiaowei YUAN, Kunio SAWAYA
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Publication number: 20100194657Abstract: The present invention relates to a radio communication system configured to secondarily-radiate, to a desired area by reflection, primarily-radiated radio waves from a transmitter apparatus, by using a reflector plate for controlling phases of reflected waves, wherein a reflecting property of the reflector plate is set so that the reflector plate reflects the primarily-radiated radio waves as plane waves of equal phase directed to a direction different from a reflection angle in the case of specular reflection.Type: ApplicationFiled: September 1, 2009Publication date: August 5, 2010Applicant: NTT DoCoMo, Inc.Inventors: Tamami Maruyama, Shinji Uebayashi, Tatsuo Furuno
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Patent number: 7668142Abstract: A radio terminal (10) and a radio relay (20, 30, 40) perform radio communications therebetween by a radio communications system else than a TDMA system, an interference measurer (13a) measures a degree of interference of each of radio slots constituting a radio channel employed in the radio communications system, a decision maker (13b, 13c) makes a decision, depending on a measurement result of the degree of interference, whether or not the radio communications by the radio communications system is able to be continued, and a switcher (42) switches, as the decision is made of the radio communications by the radio communications system to be unable to be continued, the radio communications system to a radio communications system of the TDMA system.Type: GrantFiled: June 24, 2002Date of Patent: February 23, 2010Assignee: NTT DoCoMo, Inc.Inventors: Takayuki Ishiguro, Osamu Nakamura, Shinji Uebayashi
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Patent number: 7615188Abstract: In an apparatus for measuring absorbed power including an electromagnetic field probe 1 fixedly mounted within a head simulation phantom 2 which simulates the configuration and the electromagnetic characteristics of a head of a human body, and wherein the strength of an electric field or a magnetic field of a radio wave externally irradiated upon the head simulation phantom 2 is measured by the electromagnetic field probe 1, and the power of the radio wave absorbed by the head is estimated on the basis of measured values, the head simulation phantom 2 comprises a solid dielectric 10? which simulates the configuration and the electromagnetic characteristics of a head of a human body or a liquid dielectric 10 which simulates the electromagnetic characteristics of a head of a human body and which is filled in an enclosed vessel 10 which simulates the configuration of a head of a human body. The volume of the solid dielectric 10? or the volume of the enclosed vessel 11 is equal to or less than 5×105 mm3.Type: GrantFiled: March 30, 2006Date of Patent: November 10, 2009Assignee: NTT DoCoMo, Inc.Inventors: Takahiro Iyama, Yoshiaki Tarusawa, Shinji Uebayashi, Toshio Nojima
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Patent number: 7583089Abstract: A specific absorption rate measuring apparatus including a probe configured to measure, in a two-dimensional plane, the amplitude and the phase of an electric or magnetic field generated in a phantom of which electrical properties similar to a human body tissues; an electric and/or magnetic field estimation unit configured to estimate a three-dimensional electric field distribution to be produced from a wave source defined by the two-dimensional electric and magnetic fields at a measuring point, based on the measurement results of the probe; and a specific absorption rate estimation unit configured to estimate a three-dimensional distribution of specific absorption rate based on the estimation result of the electric field estimation unit.Type: GrantFiled: June 30, 2005Date of Patent: September 1, 2009Assignee: NTT DoCoMo, Inc.Inventors: Teruo Onishi, Katsuki Kiminami, Shinji Uebayashi
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Publication number: 20090161539Abstract: A signal transmission method checks, when detecting an occurrence of a communication request, whether the communication request is a high speed communication (step S302). In the case of the high speed communication, it checks whether the number of current high speed communications (m) plus one is greater than the upper limit (mmax) of the high speed communication (step S312). If greater, it cancels the request as a call loss (S316), and sets to a variable a the ratio (h) of the rate of the high speed communication to that of a low speed communication. If the communication request is the low speed communication, it sets one to the variable a (step S304). It compares n plus a with nmax (step S306), where n is the total number of all the current communications, a is the value associated with the communication request, and nmax is the upper limit of the number of communications acceptable in a bandwidth, all of which are expressed in terms of the number of the low speed communications.Type: ApplicationFiled: December 11, 2008Publication date: June 25, 2009Inventors: Shinji Uebayashi, Seizo Onoe, Minami Ishii, Takehiro Nakamura
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Patent number: 7511511Abstract: A biological tissue equivalent phantom unit to be used by the specific absorption rate measuring system for evaluating absorption of electromagnetic wave energy includes a biological tissue equivalent phantom for absorbing an electromagnetic wave. In addition, two or more electro-optical crystals are arranged at two or more measurement points in the biological tissue equivalent phantom. The electro-optical crystals have a dielectric constant that is approximately equal to that of the biological tissue equivalent phantom. Two or more optical fibers are laid in the biological tissue equivalent phantom for optically connecting each of the electro-optical crystals to an external destination.Type: GrantFiled: May 29, 2007Date of Patent: March 31, 2009Assignees: NTT DoCoMo, Inc., Nippon Telegraph and Telephone CorporationInventors: Teruo Onishi, Ryo Yamaguchi, Shinji Uebayashi, Tadao Nagatsuma, Naofumi Shimizu, Hiroyoshi Togo
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Patent number: 7480277Abstract: A signal transmission method and apparatus over a forward traffic channel in cellular mobile communications that can simultaneously perform one or more high speed communications whose transmission rates are higher than or equal to a predetermined rate, and one or more low speed communications whose transmission rates are lower than the predetermined rate between a plurality of mobile stations and a base station.Type: GrantFiled: January 2, 2003Date of Patent: January 20, 2009Assignee: NTT DoCoMo, Inc.Inventors: Shinji Uebayashi, Seizo Onoe, Minami Ishii, Takehiro Nakamura
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Patent number: 7474905Abstract: A weight determining apparatus is disclosed. The weight determining apparatus includes two or more antenna elements that receive a test wave transmitted by one or more test wave sources prepared outside of a phantom that simulates an object that attenuates a radio wave, the antenna elements being prepared in a mobile terminal. The weight determining apparatus further includes a weight determining unit that determines weights for the antenna elements such that a signal received by the antenna elements as a whole may be maximized.Type: GrantFiled: May 12, 2005Date of Patent: January 6, 2009Assignee: NTT DoCoMo, Inc.Inventors: Ryo Yamaguchi, Shinji Uebayashi
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Publication number: 20070236229Abstract: A biological tissue equivalent phantom unit to be used by the specific absorption rate measuring system for evaluating absorption of electromagnetic wave energy includes a biological tissue equivalent phantom for absorbing an electromagnetic wave. In addition, two or more electro-optical crystals are arranged at two or more measurement points in the biological tissue equivalent phantom. The electro-optical crystals have a dielectric constant that is approximately equal to that of the biological tissue equivalent phantom. Two or more optical fibers are laid in the biological tissue equivalent phantom for optically connecting each of the electro-optical crystals to an external destination.Type: ApplicationFiled: May 29, 2007Publication date: October 11, 2007Applicants: NTT DoCoMo, Inc, NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Teruo Onishi, Ryo Yamaguchi, Shinji Uebayashi, Tadao Nagatsuma, Naofumi Shimizu, Hiroyoshi Togo
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Patent number: 7224676Abstract: A mobile station receives a signal based on a TDD method by receiving a signal based on a FDD method to acquire information of the signal based on the TDD method in a mobile communication system. For instance, the mobile station receives a signal based on a CDMA-FDD method. Then, the mobile station acquires information (e.g. information relating to a code, a frequency and a timing) of a signal based on a CDMA-TDD method from the signal based on the CDMA-FDD method. Then, the mobile station receives the signal based on the CDMA-TDD method on the basis of the acquired information.Type: GrantFiled: November 16, 2001Date of Patent: May 29, 2007Assignee: NTT DoCoMo Inc.Inventors: Shinji Uebayashi, Takanori Utano, Toshiyuki Futakata
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Patent number: 7186377Abstract: In an apparatus for measuring absorbed power including an electromagnetic field probe 1 fixedly mounted within a head simulation phantom 2 which simulates the configuration and the electromagnetic characteristics of a head of a human body, and wherein the strength of an electric field or a magnetic field of a radio wave externally irradiated upon the head simulation phantom 2 is measured by the electromagnetic field probe 1, and the power of the radio wave absorbed by the head is estimated on the basis of measured values, the head simulation phantom 2 comprises a solid dielectric 10? which simulates the configuration and the electromagnetic characteristics of a head of a human body or a liquid dielectric 10 which simulates the electromagnetic characteristics of a head of a human body and which is filled in an enclosed vessel 10 which simulates the configuration of a head of a human body. The volume of the solid dielectric 10? or the volume of the enclosed vessel 11 is equal to or less than 5×105 mm3.Type: GrantFiled: August 8, 2002Date of Patent: March 6, 2007Assignee: NTT DoCoMo, Inc.Inventors: Takahiro Iyama, Yoshiaki Tarusawa, Shinji Uebayashi, Toshio Nojima
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Patent number: 7181166Abstract: In a communication channel set up method, the utilization state of a prescribed frequency in the first frequency band that causes interferences to the first communication system when the communication channel of a particular frequency in the second frequency band is used at the second communication system is detected, and if the prescribed frequency in the first frequency band is currently used, the communication channel other than that of the particular frequency is allocated to the second communication system.Type: GrantFiled: May 24, 2002Date of Patent: February 20, 2007Assignee: NTT DoCoMo, Inc.Inventors: Naoto Shimada, Osamu Nakamura, Shinji Uebayashi, Takanori Utano