Patents by Inventor Dorin Viorel

Dorin Viorel 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: 9628212
    Abstract: A method of compensating for transmitting to multiple devices during device-to-device (D2D) communications may include determining that a receiving wireless device of a device-to-device (D2D) pair may experience a timing conflict. The timing conflict may be with respect to the receiving wireless device receiving at least a portion of a D2D communication transmitted by a transmitting wireless device of the D2D pair while the receiving wireless device is transitioning between a transmitting mode and a receiving mode. The method may also include adjusting the D2D communication to compensate for the timing conflict.
    Type: Grant
    Filed: December 2, 2013
    Date of Patent: April 18, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Chenxi Zhu, Dorin Viorel, Akira Ito
  • Patent number: 9622064
    Abstract: A method of adjusting power of a neighbor discovery signal may include determining a maximum transmission power of a transmitting wireless device. The transmitting wireless device may be configured to transmit a neighbor discovery signal to one or more receiving wireless devices. The one or more receiving wireless devices may be discovered neighbor wireless devices of the transmitting wireless device and may be configured to receive the neighbor discovery signal. The method may further include determining a power level of the neighbor discovery signal based on the maximum transmission power of the transmitting wireless device and a number of the discovered neighbor wireless devices.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: April 11, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Chenxi Zhu, Dorin Viorel, Huy Dung Han, Akira Ito
  • Patent number: 9572123
    Abstract: In an example embodiment, a system may include a mobile terminal. The mobile terminal may be configured to receive a first signal including a first time advance value. The first signal may be transmitted by a first base station. The mobile terminal may be further configured to receive a second signal. The second signal may be transmitted by a second base station. The mobile base station may be further configured to determine a difference in propagation delay between the first and second signals. The mobile terminal may be further configured to determine a second time advance value by correlating the first time advance value with the difference in propagation delay.
    Type: Grant
    Filed: March 14, 2012
    Date of Patent: February 14, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Dorin Viorel, Chenxi Zhu
  • Publication number: 20160295503
    Abstract: An access method of a device (10) such as an MTC device to a network (20, 30, 40) which allows the transmission of small data packets without the need to read all the System Information normally required to make an initial network access. The device (10) may notify the network that an access request is occurring from a device that was either specifically allowed to use a stored access configuration or is accessing the cell using modified system information being broadcast by the cell. Such notification may be implicit in the characteristics (choice of preamble, timing, frequency and/or repetition) of the access request. The network, preferably having knowledge of the method being used by the device to access the network, can either reject this access or accept it depending on whether the access was from a stored configuration or read from System Information.
    Type: Application
    Filed: June 14, 2016
    Publication date: October 6, 2016
    Applicant: FUJITSU LIMITED
    Inventors: Paul BUCKNELL, Yiwei FANG, Dorin VIOREL, Timothy MOULSLEY
  • Patent number: 9414379
    Abstract: According to an aspect of an embodiment, a method of determining a precoder for wireless communications may include acquiring first channel information associated with a first channel between a first node of a wireless communication network and a second node of the wireless communication network. The first node may be configured to transmit a first wireless signal in a wireless communication resource to the second node via the first channel. The method may further include acquiring second channel information associated with a second channel between the first node and a third node of the wireless communication network. The third node being may be configured to receive a second wireless signal transmitted in the wireless communication resource. Additionally, the method may include determining a precoder for transmission of the first wireless signal based on the first channel information and the second channel information.
    Type: Grant
    Filed: December 17, 2013
    Date of Patent: August 9, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Chenxi Zhu, Dorin Viorel, Huy Dung Han, Akira Ito
  • Patent number: 9414333
    Abstract: A method for transmission of information about downlink and uplink parameters of a intermediate apparatus link in a multi-hop wireless communication system, the system comprising a first node apparatus, a second node apparatus and one or more intermediate apparatuses, each said apparatus being operable to transmit and receive information along a series of links forming a communication path for downlink and uplink communication, the communication path extending between the first node and second node apparatuses via the or each intermediate apparatus, each link comprising either a first node link between the first node apparatus and a said intermediate apparatus or an intermediate apparatus link between a said intermediate apparatus and a said apparatus which is not the first node apparatus, and the system having access to a minimum allocation unit for allocating time and transmission frequency bandwidth, the method comprising: obtaining values of downlink and uplink parameters for a particular intermediate app
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: August 9, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Michael John Beems Hart, Yuefeng Zhou, Dorin Viorel, Chenxi Zhu, Michiharu Nakamura, Masahiro Watanabe, Hiroshi Fujita, Makoto Yoshida
  • Patent number: 9301160
    Abstract: A method of supervising device-to-device communication may include determining that a first wireless device and a second wireless device are configured to communicate with each other through device-to-device communication as a device-to-device pair. The method may further include assigning a pair identifier to the device-to-device pair. The pair identifier may be configured to allow the device-to-device pair to communicate with each other and an access point of a wireless communication network while protecting from eavesdropping. Further, the method may include directing the first wireless device and the second wireless device to use the pair identifier while participating in the device-to-device communication.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: March 29, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Chenxi Zhu, Dorin Viorel, Huy Dung Han, Akira Ito
  • Patent number: 9232460
    Abstract: A method of discovering neighboring wireless devices may include assigning a discovery channel resource to a transmitting wireless device. The transmitting wireless device may accordingly be configured to transmit a neighbor discovery signal based on the discovery channel resource. The method may further include receiving neighbor discovery signal information associated with the neighbor discovery signal as received by a receiving wireless device that may be configured to receive the neighbor discovery signal. Additionally, the method may include directing the transmitting wireless device and the receiving wireless device to participate in device-to-device communication with each other based on the neighbor discovery signal information.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: January 5, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Chenxi Zhu, Dorin Viorel, Huy Dung Han, Akira Ito
  • Patent number: 9088994
    Abstract: A method is provided for device detection by a base station comprising receiving a plurality of signals over a preamble subframe from an endpoint. The plurality of signals are attempting to access an access group of the preamble subframe. Additionally, the plurality of signals are received on a random access channel using a wireless network. Further, the plurality of signals have a plurality of last gasp messages (LGMs). The method additionally comprises determining an allowable rate of collisions for the plurality of signals and determining an actual rate of collisions for the plurality of signals. The method includes increasing the size of the access group allocated to the plurality of signals having the plurality of LGMs, based on whether the actual rate of collisions exceeds the allowable rate of collisions.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: July 21, 2015
    Assignee: Fujitsu Limited
    Inventors: Dorin Viorel, Akira Ito
  • Publication number: 20150055570
    Abstract: A method may include receiving a communication from each of multiple machine-type communication (MTC) devices in a radio access network at a base station. The radio access network and base station may be configured to support the MTC devices and human operated devices. The method may also include determining that the communications are received from the MTC devices and allocating a first set of downlink resources in a downlink channel for future assignment of downlink data communications from the base station to the MTC devices. The method may also include allocating a first set of uplink resources in an uplink channel for future assignment of uplink data communications from the MTC devices to the base station.
    Type: Application
    Filed: March 28, 2014
    Publication date: February 26, 2015
    Inventors: Dorin VIOREL, Akira ITO
  • Patent number: 8902742
    Abstract: A method for optimized access of a physical random access channel (PRACH) includes sampling a plurality of mapped zones associated with a base station. Each of the mapped zones has a plurality of endpoints. The method further includes determining a subset of disconnected endpoints in the given mapped zone where the disconnected endpoints are disconnected from a wireless network. The method also includes estimating a PRACH load based on the subset of disconnected endpoints. Additionally, based on whether the estimated PRACH load is a pre-determined factor larger than an original PRACH allocation, the method includes increasing the PRACH allocation to accommodate reconnection of the subset of disconnected endpoints in the given mapped zone.
    Type: Grant
    Filed: October 8, 2012
    Date of Patent: December 2, 2014
    Assignee: Fujitsu Limited
    Inventors: Dorin Viorel, Chenxi Zhu, Akira Ito
  • Patent number: 8867983
    Abstract: A method of controlling a relay station in a cell of a multi-hop relay network in accordance with a one-way propagation delay between a base station in the cell and the relay station. A relay station in a cell of a multi-hop relay network including means for controlling the signal flow between the relay station and the various other stations in the cell in accordance with a one-way propagation delay between a base station in the cell and the relay station.
    Type: Grant
    Filed: August 14, 2008
    Date of Patent: October 21, 2014
    Assignee: Fujitsu Semiconductor Limited
    Inventors: Chenxi Zhu, Michiharu Nakamura, Dorin Viorel
  • Patent number: 8867396
    Abstract: A method for device identification includes determining a mass event has occurred in a wireless network from a reception of a plurality of signals each having a last gasp message, sampling a plurality of mapped zones associated with a base station, identifying which mapped zones are associated with a disconnected endpoint in a zone list, determining a length of time of the mass event, and selectively providing the zone list to identify disconnected endpoints based at least upon the length of time of the mass event. Each mapped zone includes a plurality of wireless device endpoints associated with the mapped zone. The sampling includes determining whether any of a subset of the endpoints associated with the given mapped zone are disconnected from the wireless network.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: October 21, 2014
    Assignee: Fujitsu Limtied
    Inventors: Dorin Viorel, Akira Ito
  • Publication number: 20140274192
    Abstract: A method of adjusting power of a neighbor discovery signal may include determining a maximum transmission power of a transmitting wireless device. The transmitting wireless device may be configured to transmit a neighbor discovery signal to one or more receiving wireless devices. The one or more receiving wireless devices may be discovered neighbor wireless devices of the transmitting wireless device and may be configured to receive the neighbor discovery signal. The method may further include determining a power level of the neighbor discovery signal based on the maximum transmission power of the transmitting wireless device and a number of the discovered neighbor wireless devices.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Chenxi ZHU, Dorin VIOREL, Huy Dung HAN, Akira ITO
  • Publication number: 20140269528
    Abstract: A method of supervising device-to-device communication may include determining that a first wireless device and a second wireless device are configured to communicate with each other through device-to-device communication as a device-to-device pair. The method may further include assigning a pair identifier to the device-to-device pair. The pair identifier may be configured to allow the device-to-device pair to communicate with each other and an access point of a wireless communication network while protecting from eavesdropping. Further, the method may include directing the first wireless device and the second wireless device to use the pair identifier while participating in the device-to-device communication.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Chenxi ZHU, Dorin VIOREL, Huy Dung HAN, Akira ITO
  • Publication number: 20140269494
    Abstract: A method of discovering neighboring wireless devices may include assigning a discovery channel resource to a transmitting wireless device. The transmitting wireless device may accordingly be configured to transmit a neighbor discovery signal based on the discovery channel resource. The method may further include receiving neighbor discovery signal information associated with the neighbor discovery signal as received by a receiving wireless device that may be configured to receive the neighbor discovery signal. Additionally, the method may include directing the transmitting wireless device and the receiving wireless device to participate in device-to-device communication with each other based on the neighbor discovery signal information.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Chenxi ZHU, Dorin VIOREL, Huy Dung HAN, Akira ITO
  • Patent number: 8811220
    Abstract: A method for cooperative data transfer includes establishing a primary wireless connection with a primary access station. The primary wireless connection uses a primary synchronization channel that is transmitted during a first frame of a super frame. The super frame comprises a plurality of frames. The method also includes detecting a secondary synchronization channel generated by an alternate access station during a subsequent frame of the super frame. The method further includes determining whether the detected secondary synchronization channel has a signal strength greater than a threshold signal strength. The method additionally includes receiving permission to begin a cooperative data transfer operation with both the primary access station and the alternate access station.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: August 19, 2014
    Assignee: Fujitsu Semiconductor Limited
    Inventors: Dorin Viorel, Masato Okuda, Kevin Power, Luciano Sarperi
  • Publication number: 20140204779
    Abstract: According to an aspect of an embodiment, a method of determining a precoder for wireless communications may include acquiring first channel information associated with a first channel between a first node of a wireless communication network and a second node of the wireless communication network. The first node may be configured to transmit a first wireless signal in a wireless communication resource to the second node via the first channel. The method may further include acquiring second channel information associated with a second channel between the first node and a third node of the wireless communication network. The third node being may be configured to receive a second wireless signal transmitted in the wireless communication resource. Additionally, the method may include determining a precoder for transmission of the first wireless signal based on the first channel information and the second channel information.
    Type: Application
    Filed: December 17, 2013
    Publication date: July 24, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Chenxi ZHU, Dorin VIOREL, Huy Dung HAN, Akira ITO
  • Publication number: 20140098660
    Abstract: A method for optimized access of a physical random access channel (PRACH) includes sampling a plurality of mapped zones associated with a base station. Each of the mapped zones has a plurality of endpoints. The method further includes determining a subset of disconnected endpoints in the given mapped zone where the disconnected endpoints are disconnected from a wireless network. The method also includes estimating a PRACH load based on the subset of disconnected endpoints. Additionally, based on whether the estimated PRACH load is a pre-determined factor larger than an original PRACH allocation, the method includes increasing the PRACH allocation to accommodate reconnection of the subset of disconnected endpoints in the given mapped zone.
    Type: Application
    Filed: October 8, 2012
    Publication date: April 10, 2014
    Applicant: Fujitsu Limited
    Inventors: Dorin Viorel, Chenxi Zhu, Akira Ito
  • Publication number: 20140064111
    Abstract: A method is provided for device detection by a base station comprising receiving a plurality of signals over a preamble subframe from an endpoint. The plurality of signals are attempting to access an access group of the preamble subframe. Additionally, the plurality of signals are received on a random access channel using a wireless network. Further, the plurality of signals have a plurality of last gasp messages (LGMs). The method additionally comprises determining an allowable rate of collisions for the plurality of signals and determining an actual rate of collisions for the plurality of signals. The method includes increasing the size of the access group allocated to the plurality of signals having the plurality of LGMs, based on whether the actual rate of collisions exceeds the allowable rate of collisions.
    Type: Application
    Filed: August 31, 2012
    Publication date: March 6, 2014
    Applicant: Fujitsu Limited
    Inventors: Dorin Viorel, Akira Ito