Patents by Inventor Mikio Iwamura

Mikio Iwamura 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).

  • Patent number: 9107111
    Abstract: In order to assure reception of broadcast information by a user terminal handed over to a micro base station by CRE (Cell Range Expansion) and to reduce the number of transmission stopped subframes in a macro base station, the present invention provides a notification method for a user terminal to receive modification notification information for notifying modification in system information from the micro base station, the notification method including: the macro base station notifying the micro base station of a subframe pattern including a protection subframe to protect the modification notification information every a plurality of radio frames; and the micro base station notifying the user terminal of identification information of the protection subframe in the subframe pattern.
    Type: Grant
    Filed: November 8, 2011
    Date of Patent: August 11, 2015
    Assignee: NTT DOCOMO, INC.
    Inventors: Tetsushi Abe, Mikio Iwamura, Hideaki Takahashi, Hiroyuki Ishii, Satoshi Nagata, Naoto Ookubo, Nobuhiko Miki, Anil Umesh
  • Patent number: 9084182
    Abstract: When a network is in a state of requiring some sort of access barring, a reference value notified to a mobile device is determined to indicate a value in which an access of a certain mobile device is denied while an access of another mobile device is allowed. When an own device has a special type access class, it is determined that an access is allowed The appropriateness of an access is determined according to designation from the network when the own device has the special type access class, and when the own device does not have the special type access class, it is determined that an access is denied.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: July 14, 2015
    Assignee: NIT DOCOMO, INC.
    Inventors: Mikio Iwamura, Minami Ishii, Mutsumi Ishimoto
  • Patent number: 9055480
    Abstract: A mobile communication method according to the present invention includes a step A of notifying, by a radio base station eNB, a mobile station UE during communication in a subordinate cell #1 of “CSI-RS/Muting configuration information” indicating a transmission method of CSI-RS; and a step B of performing, by the mobile station UE, a reception process on the basis of the “CSI-RS/Muting configuration information”.
    Type: Grant
    Filed: November 18, 2011
    Date of Patent: June 9, 2015
    Assignee: NTT DOCOMO, INC.
    Inventors: Satoshi Nagata, Tetsushi Abe, Naoto Ookubo, Mikio Iwamura
  • Patent number: 9042834
    Abstract: A mobile station (UE) according to the present invention is configured to repeatedly transmit a first measurement report including a radio quality of a first cell and to repeatedly transmit a second measurement report including a radio quality of a second cell at the same timings, when the mobile station starts transmitting the first measurement report and thereafter starts transmitting the second measurement report.
    Type: Grant
    Filed: May 29, 2009
    Date of Patent: May 26, 2015
    Assignee: NTT DOCOMO, INC.
    Inventors: Mikio Iwamura, Hiroaki Yamagishi, Hiroyuki Ishii, Takeshi Nakamori
  • Patent number: 9036535
    Abstract: A mobile communication method according to the present invention includes a step of transmitting, by a radio base station DeNB, “RA Response” to a mobile station UE within a “RA Response window” for the mobile station UE when “RA Preamble” is received from the mobile station UE, a step of transmitting, by a relay node RN, a signal to the mobile station UE in a subframe other than an MBSFN subframe, and a step of transmitting, by the radio base station DeNB, “RA Response” to the relay node RN in an MBSFN subframe of a “RA Response window” for the relay node RN when “RA Preamble” is received from the relay node RN.
    Type: Grant
    Filed: July 7, 2011
    Date of Patent: May 19, 2015
    Assignee: NTT DOCOMO, INC.
    Inventors: Yasufumi Morioka, Hideaki Takahashi, Yukihiko Okumura, Mikio Iwamura, Akira Yamada
  • Patent number: 9025526
    Abstract: A mobile station UE according to the present invention includes a notification reception unit 21 configured to receive an SIB2 in E-UTRAN and a barring processor unit 22 configured to perform predetermined barring processing in E-UTRAN based on information elements included in the SIB2. The barring processor unit 22 is configured to perform barring processing for origination of a CS call using a CSFB function based on “ac-BarringForCSFB-r10” and “ac-BarringForMO-Data” among the information elements.
    Type: Grant
    Filed: June 13, 2011
    Date of Patent: May 5, 2015
    Assignee: NTT DOCOMO, INC.
    Inventors: Wuri Andarmawanti Hapsari, Mikio Iwamura, Itsuma Tanaka
  • Patent number: 9025539
    Abstract: A mobile communication method according to the present invention includes a step of transmitting, by a radio base station eNB, “RRC Connection Reconfiguration” instructing to add new DL CC to a mobile station UE, a step of calculating, by the mobile station UE, Power headroom on the basis of a path loss estimated from the new DL CC, in response to the “RRC Connection Reconfiguration”, and a step of transmitting, by the mobile station UE, “MAC Control Element” including the Power headroom to the radio base station eNB.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: May 5, 2015
    Assignee: NTT DOCOMO, Inc.
    Inventors: Anil Umesh, Mikio Iwamura
  • Publication number: 20150119060
    Abstract: When a network is requiring access barring, a mobile device determines whether a reference value broadcasted to the mobile device indicates a value determining that an access is denied regardless of a numerical value generated by the mobile device, or indicates a value having a possibility that an access of a certain mobile device is denied while an access of another mobile device is allowed. In the latter case, the mobile device determines appropriateness of an access by performing predetermined processing using the reference value as a value to be checked for a relationship with a numerical value generated by the mobile device when the mobile device does not have a special type access class, and uses a value enabling allowance of an access without performing the predetermined processing as a value for determining appropriateness of an access when the mobile device has the special type access class.
    Type: Application
    Filed: May 21, 2013
    Publication date: April 30, 2015
    Inventors: Kenichiro Aoyagi, Mikio Iwamura, Minami Ishii, Mitsumi Ishimoto
  • Patent number: 9001705
    Abstract: A mobile communication system according to the present invention is configured such that a relay node RN is configured to time-share a subframe for transmission and reception in a Un interface and a subframe for transmission and reception in a Uu interface, and a radio base station DeNB is configured to transmit SI, which is to be transmitted in a subordinate cell, to the relay node RN via individual signaling.
    Type: Grant
    Filed: January 7, 2011
    Date of Patent: April 7, 2015
    Assignee: NTT DOCOMO, INC.
    Inventors: Mikio Iwamura, Hideaki Takahashi
  • Patent number: 8996006
    Abstract: A mobile station UE according to the present invention includes: a determination unit 14 configured to determine whether to notify a measurement result based on the radio quality in the serving cell and the neighboring cell measured by the measurement unit 13, and the parameter acquired by the parameter acquisition unit 12; and a notification unit 15 configured to notify the radio base station eNB of the measurement result when the determination unit 14 determines that the measurement result is to be transmitted, in which only when a first predetermined period or more has elapsed after the mobile station UE starts to communicate with the serving cell, the determination unit 14 is configured to determine whether to notify the measurement result.
    Type: Grant
    Filed: August 18, 2010
    Date of Patent: March 31, 2015
    Assignee: NTT DOCOMO, Inc.
    Inventors: Takeshi Nakamori, Hiroyuki Ishii, Mikio Iwamura, Kengo Yagyu
  • Patent number: 8995330
    Abstract: A base station generates first setting information commonly used for establishing a logical path for communication with a user apparatus and for establishing a logical path for communication with a relay station, and second setting information used only for establishing the logical path for communication with the relay station, and transmits a second RRC message including the second setting information to the relay station after transmitting a first RRC message including the first setting information to the relay station. The first setting information includes information indicating a priority of a radio bearer in the logical path, information indicating usage of resources in SPS, information indicating resources of SRS, configuration information in a MAC sublayer, and information on change of a security encryption key in handover, and the second setting information includes at least system information and MBSFN information.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: March 31, 2015
    Assignee: NTT DOCOMO, Inc.
    Inventors: Yasufumi Morioka, Akira Yamada, Junichiro Hagiwara, Hideaki Takahashi, Mikio Iwamura
  • Patent number: 8983428
    Abstract: In a mobile communication system according to the present invention, the mobile communication system is configured to manage a specific mobile station which is allowed to communicate through a CSG cell under the control of a home base station (Home-eNB); and a general mobile station (UE) other than the specific mobile station is configured to be capable of using the CSG cell as a camped cell, only when broadcast information indicating an allowance of a camping in the specific cell is received.
    Type: Grant
    Filed: October 28, 2008
    Date of Patent: March 17, 2015
    Assignee: NTT DOCOMO, INC.
    Inventors: Mikio Iwamura, Masafumi Masuda, Takaaki Sato, Takehiro Nakamura
  • Patent number: 8977266
    Abstract: A radio base station includes a mobile communication system, a relay node and a radio base station connected via a radio bearer. A mobile station is configured to perform a handover process between a state in which a radio bearer is set with the relay node so as to communicate via the relay node and the radio base station, and a state in which a radio bearer is set with the radio base station so as to communicate via the radio base station. The handover process is configured such that a data signal is transferred via the radio bearer between the relay node and the radio base station.
    Type: Grant
    Filed: April 27, 2010
    Date of Patent: March 10, 2015
    Assignee: NTT DOCOMO, INC.
    Inventors: Hideaki Takahashi, Wuri Andarmawanti Hapsari, Anil Umesh, Mikio Iwamura, Minami Ishii
  • Patent number: 8923845
    Abstract: In a mobile station (UE) according to the present invention, an AS function is configured to notify, when detecting a failure in a radio link established with the radio base station is detected or when discovering a cell subject to a location registration by a cell selection process, a NAS function of the detection or the discovery; and the NAS function is configured to transmit, in response to the notification, a location registration request signal to a mobile switching center (MME).
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: December 30, 2014
    Assignee: NTT DoCoMo, Inc.
    Inventors: Itsuma Tanaka, Yasuhiro Kato, Mikio Iwamura, Masashi Kanauchi
  • Patent number: 8923752
    Abstract: A relay station includes a signal generation unit configured to generate a signal in the relay station and a receiving unit configured to receive a signal from a first communication station. The relay station further includes a signal generating node identifying unit configured to identify whether a signal to be transmitted to a second communication station is a received signal received from the first communication station or a generated signal generated by the signal generation unit. The relay station further includes a signal transmission unit configured to transmit both or one of the received signal and the generated signal associated with a radio bearer to the second communication station.
    Type: Grant
    Filed: September 27, 2011
    Date of Patent: December 30, 2014
    Assignee: NTT DoCoMo, Inc.
    Inventors: Yasufumi Morioka, Akira Yamada, Hideaki Takahashi, Mikio Iwamura, Junichiro Hagiwara
  • Patent number: 8923200
    Abstract: The present invention relates to a mobile communication method, in which a mobile station UE transmits uplink signals to a radio base station eNB using a plurality of “Component Carriers” having different carrier frequencies, includes a step A of transmitting, by the radio base station eNB, TA to be applied to the plurality of “Component Carriers”, to the mobile station UE, and a step B of adjusting, by the mobile station UE, transmission timings of the uplink signals on the plurality of “Component Carriers” based on the received TA.
    Type: Grant
    Filed: January 7, 2011
    Date of Patent: December 30, 2014
    Assignee: NTT DoCoMo, Inc.
    Inventors: Mikio Iwamura, Anil Umesh
  • Patent number: 8918105
    Abstract: A mobile communication method involves the steps of a mobile station transmitting indication information to a radio base station managing the cell of entry of a predetermined area corresponding to a cell of a second frequency, a step of transmitting by the radio base station a measurement confirmation instructing the mobile station to start measuring a radio quality in the cell of the second frequency, a step of transmitting by the mobile station a measurement report including cell identification information used in a scrambling process for a synchronization signal broadcasted in the cell of the second frequency, a step of transmitting by the radio base station a report request to start transmitting predetermined information broadcasted in the cell of the second frequency when the radio base station has received the measurement report, and a step of reporting by the mobile station the predetermined information in response to the report request.
    Type: Grant
    Filed: January 7, 2011
    Date of Patent: December 23, 2014
    Assignee: NTT DoCoMo, Inc.
    Inventor: Mikio Iwamura
  • Patent number: 8913545
    Abstract: A mobile communication system according to the present invention is configured such that a relay node RN is configured to time-share a subframe for transmission and reception in a Un interface and a subframe for transmission and reception in a Uu interface, and a radio base station DeNB is configured to transmit SI, which is to be transmitted in a subordinate cell, to the relay node RN via individual signaling.
    Type: Grant
    Filed: April 5, 2013
    Date of Patent: December 16, 2014
    Assignee: NTT DoCoMo, Inc.
    Inventors: Mikio Iwamura, Hideaki Takahashi
  • Patent number: 8885543
    Abstract: Interference to a reception circuit of a relay node itself is reduced, which occurs when transmission-and-reception process in a Un radio bearer and transmission-and-reception process in a Uu radio bearer are simultaneously performed. A mobile communication method according to the present invention includes a step of determining, by a relay node RN, whether it is necessary to perform the scheduling of a second timing such that the second timing does not overlap a first timing in a time direction, based on a first operating frequency f1 used in a radio zone between the relay node RN and a mobile station UE and a second operating frequency f2 used in a radio zone between a radio base station DeNB and the relay node RN, and a step of notifying, by the relay node RN, the radio base station DeNB of the determination result.
    Type: Grant
    Filed: October 5, 2010
    Date of Patent: November 11, 2014
    Assignee: NTT DoCoMo, Inc.
    Inventors: Hideaki Takahashi, Wuri Andarmawanti Hapsari, Anil Umesh, Mikio Iwamura, Minami Ishii
  • Patent number: 8874100
    Abstract: A mobile communication method according to the present invention includes a step in which, when a relay node RN, which is subordinate to a radio base station DeNB and is in an “RRC_CONNECTED state”, received an “RRC connection release message” from the radio base station DeNB, the relay node RN is transitioned to an “RRC_IDLE state” after transmitting an “RRC connection release message” to a mobile station UE, which is subordinate to the relay node RN and is in the “RRC_CONNECTED state”, and a predetermined time T2 elapses.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: October 28, 2014
    Assignee: NTT DoCoMo, Inc.
    Inventors: Yasufumi Morioka, Hideaki Takahashi, Yukihiko Okumura, Mikio Iwamura, Akira Yamada