Patents by Inventor Chung Gu Kang

Chung Gu Kang 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: 7590611
    Abstract: A clustering method of a wireless sensor network is provided to minimize energy consumption. The clustering method includes the operations of determining a number of initial nodes within radio range of ordinary node, the ordinary nodes existing within radio range of a cluster head, and setting an ordinary node having a highest number of initial nodes among the ordinary nodes in the radio range of the cluster head, as a gateway. Because the number of usually large energy consuming cluster heads and gateways can be minimized, energy efficiency of wireless sensor network increases.
    Type: Grant
    Filed: April 28, 2006
    Date of Patent: September 15, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kyeong Hur, Chung-gu Kang, Il-whan Kim, Ki-seok Chang
  • Publication number: 20090219909
    Abstract: Provided are a channel switching method for effectively performing channel switching in a cognitive radio system while protecting an incumbent user, a method of managing a frequency channel, and a base station and customer premises equipment (CPE) using the methods. In the channel switching method performed by the base station, a currently unavailable first frequency channel is detected from among at least one uplink/downlink frequency channel which is set as a communication channel with the CPE; a channel switching request message requesting switching from the first frequency channel to a second frequency channel is transmitted to the CPE; and the first frequency channel is switched to the second frequency channel when a channel switching report message reporting that channel switching is to be performed in response to the channel switching request message is received from the CPE.
    Type: Application
    Filed: November 16, 2006
    Publication date: September 3, 2009
    Inventors: Gwangzeen Ko, Sung Hyun Hwang, Bub-Joo Kang, Chung-Gu Kang, Il-Hwan Kim, Chang-Joo Kim, Myung Sun Song
  • Publication number: 20090129401
    Abstract: A method for staggered zone resource allocation in an orthogonal frequency division multiple access (OFDMA) system having a cluster includes: dividing a frequency resource of the OFDMA system into a plurality of time zones along a time axis; determining at least two resource allocation start zones among the plurality of time zones in at least two cells of the cluster, respectively; arranging users in each of the at least two cell according to a path loss in a descending order; and sequentially allocating the frequency resource to the arranged users from the at least two resource allocation start zones in the at least two cells, respectively.
    Type: Application
    Filed: January 30, 2008
    Publication date: May 21, 2009
    Applicant: Korea University Industrial & Academic Collaboration Foundation
    Inventors: Chung Gu KANG, Jun Ho Son
  • Patent number: 7532598
    Abstract: A method for flooding a route request packet that is received at a node in a communication system constructed of at least three nodes including a source node that requests to establish a route and a destination node that receives the route request. One of a plurality of levels having different transmission periods is determined using a strength of a received signal of a measured packet. A transmission start point is selected at the determined level, and it is determined whether a route request packet is re-received before the selected transmission start point. The received packet is broadcast at the selected transmission start point when the packet is not re-received. The transmission start point is randomly selected within the transmission period or at the level in consideration of the number of the connected nodes.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: May 12, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Soon-jin Choi, Il-whan Kim, Chung-gu Kang, Min-seop Jeong, Yu-jin Lim
  • Patent number: 7522637
    Abstract: A dynamic resource allocation method in an OFDMA system is provided. A base station determines if each of a plurality of SSs supports subchannel-based dynamic resource allocation. If an SS supports the subchannel-based dynamic resource allocation, the base station allocates resources to the SS on a subchannel basis. If the SS does not support the subchannel-based dynamic resource allocation, the base station allocates resources to the SS on a burst basis.
    Type: Grant
    Filed: July 11, 2005
    Date of Patent: April 21, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Il-Whan Kim, Sang-Boh Yun, Sung-Hyun Cho, Won-Hyoung Park, Chung-Gu Kang, Jeong-Hwan Lee
  • Publication number: 20080305798
    Abstract: A handover method of a mobile station in a wireless mobile communication system and a system therefore are provided. The mobile station transmits a handover indication message to a serving base station, receives a ranging response message that comprises authentication information required for the mobile station to authenticate a target base station, receives fast ranging resources and transmits a ranging response acknowledgement (ACK) message, which comprises authentication information required for the target base station to authenticate the mobile station, to the target base station after receiving the fast ranging resources. Accordingly, a handover break time is minimized.
    Type: Application
    Filed: June 5, 2008
    Publication date: December 11, 2008
    Applicants: SAMSUNG ELECTRONICS CO. LTD., KOREA UNIVERSITY INDUSTRIAL & ACADEMIC COLLABORATION FOUNDATION
    Inventors: Jung-Je SON, Pan-Yuh JOO, Hyoung-Kyu LIM, Sung-Jin LEE, Hyun-Jeong KANG, Jae-Hyuk JANG, Chung-Gu KANG, Jun-Hyuk PARK, Tae-Young MIN
  • Publication number: 20080267111
    Abstract: In a method for transmitting data from a first node to a second node through first and second relay units in a wireless communication system: a) a first symbol is transmitted from the first node to the second node and the first relay unit during a first time slot section; b) the first symbol, which is received from the first node, is transmitted from the first relay unit to the second node during a second time slot section; c) a second symbol is transmitted from the first node to the second node and the second relay unit during the second time slot section; and d) the second symbol, which is received from the first node, is transmitted from the second relay unit to the second node during a third time slot section.
    Type: Application
    Filed: November 24, 2006
    Publication date: October 30, 2008
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Hyoung-Soo Lim, Dong-Seung Kwon, Chung-Gu Kang, Hyun-Seok Ryu
  • Publication number: 20080227498
    Abstract: Provided is a low-complexity transmit/receive antenna selection method for Multi-Input Multi-Output (MIMO) systems. The method includes the steps of generating a gain matrix of receive channel, calculating norm values of channel gains for each row (receive antennas) and column (transmit antennas) of the generated gain matrix of the receive channel, selecting an antenna with the maximum norm value among the calculated norm values of channel gains, and repeatedly performing the process of alternately selecting transmit and receive antennas having the maximum channel gain value among the channel gain values of the selected antenna until a required number of antennas is all selected.
    Type: Application
    Filed: December 21, 2005
    Publication date: September 18, 2008
    Applicant: Electroncs and Telecommunications Research Institute
    Inventors: Dong-Seung Kwon, Chung-Gu Kang, Jun-Ho Son
  • Publication number: 20080207117
    Abstract: An apparatus and a method for selecting one of a plurality of relay modes in a wireless communication system are provided. The method includes checking a channel state between a Mobile Station (MS) and each of at least one Relay Station (RS), selecting the relay mode for supporting a relay service using the determined channel state between the MA and each of the at least one RS, and providing the relay service to the MS using the selected relay mode. Thus, system throughput and outage performance can be enhanced by using the appropriate relay mode based on the MS distribution or the channel condition.
    Type: Application
    Filed: February 22, 2008
    Publication date: August 28, 2008
    Applicants: SAMSUNG ELECTRONICS CO., LTD., Industry-University Cooperation Foundation Sogang University
    Inventors: Eun-Taek LIM, Young-Bin CHANG, Il-Hwan KIM, Chung-Gu KANG, Dong-Seek PARK, Pan-Yuh JOO, Chang-Yoon OH
  • Publication number: 20080188230
    Abstract: A method and apparatus for allocating a radio resource in a wireless sensor network are provided, in which a signal requesting a radio resource allocation is received from any one of sensors included in the wireless sensor network, an amount of remaining energy is compared with respect to each zone where a sensor transmitting the signal is included, an order of zones, from a zone comprising a greatest amount of remaining energy to a zone having a least amount of remaining energy, is determined as a result of the comparison, and a time slot is allocated to a sensor of each zone according to the determined order of zones, when transmitting a frame for the radio resource allocation.
    Type: Application
    Filed: July 6, 2007
    Publication date: August 7, 2008
    Inventors: Paul Barom Jeon, Jun Hyeong Kim, Sang Do Park, Sun Shin An, Won Keun Kong, Chung Gu Kang, Sung Min Kang, Il Whan Kim
  • Patent number: 7400896
    Abstract: A transmission and reception apparatus and method for use in a wireless communication system, and an apparatus and method for adaptively transmit and receive a signal according to channel state in a wireless communication system. An apparatus for adaptively performing transmission according to a state of a channel transmitted from a transmitter to at least one receiver includes a signal to interference ratio estimator for estimating a signal to interference ratio of the channel using a signal transmitted from the at least one receiver; and an adaptive transmitter for transmitting data to the at least one receiver on a basis of the estimated signal to interference ratio.
    Type: Grant
    Filed: September 2, 2005
    Date of Patent: July 15, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kwang-Man Ok, Chung-Gu Kang, Min-Goo Kim, Wi-Sang Rho
  • Patent number: 7391789
    Abstract: An ad-hoc network wireless communication system transmits data packets from one hop to another hop in a relay manner, and includes a transmitting node for transmitting a RTS message in order to transmit the data packets, and a receiving node, existing in a next hop of the transmitting node, for transmitting a CTS message in response to the RTS message transmitted from the transmitting node. The receiving node transmits the CTS message to another receiving node successively connected to the receiving node in response to the transmitted CTS message, and the transmitting node transmits the data packets to the receiving node in the case that the CTS message transmitted by the receiving node of the next hop is received over a predetermined number of times. The ad-hoc network wireless communication system can maximize the communication efficiency in a multi-hop network with its complexity minimized by extending a MAC protocol based on a IEEE 802.11 DCF to a reservation-based MAC in the multi-hop network.
    Type: Grant
    Filed: September 1, 2004
    Date of Patent: June 24, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chung-gu Kang, Won-soo Kim, Il-whan Kim
  • Patent number: 7339921
    Abstract: Provided is a connection identification (CID) allocating method in a Broadband Wireless Access (BWA) communication system having a medium access control protocol data unit (MAC PDU) format with a header field including control information and a payload field including user data. The header field has a first CID field of a first length indicating a CID of a mobile subscriber station (MSS), a second CID field of a second length and indicating the CID of the MSS by being concatenated with a CID of the first CID field, and a type field indicating whether the second CID field is used. The method includes determining a CID to be allocated to a particular MSS; and if the length of the determined CID is equal to the first length, including the determined CID in the first CID field, including, in the type field, information indicating that the second CID field is not used, and transmitting the MAC PDU to the MSS.
    Type: Grant
    Filed: May 10, 2005
    Date of Patent: March 4, 2008
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Il-Whan Kim, Sung-Hyun Cho, Sang-Boh Yun, Won-Hyoung Park, Chung-Gu Kang, Jeong-Hwan Lee
  • Publication number: 20070230376
    Abstract: A resource allocation method in a wireless communication system for providing a communication service in a given system frequency band to access terminals (ATs) within a broad-band service area around an access point (AP) and to ATs within a narrow-band service area having a radius larger than the radius of the broad-band service area. In the resource allocation method, the system frequency band is divided into a Time Division Duplexing (TDD) interval and a Frequency Division Duplexing (FDD) interval in time, and the TDD interval and the FDD interval are defined as TDD resources and FDD resources, respectively. The TDD resources are allocated to an AT within the broad-band service area, and the FDD resources are allocated to an AT within the narrow-band service area.
    Type: Application
    Filed: December 28, 2006
    Publication date: October 4, 2007
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Seung-Young Park, Sang-Boh Yun, Yeon-Woo Lee, Chung-Gu Kang, Il-Whan Kim
  • Publication number: 20070140167
    Abstract: An apparatus and method for reducing MAP channel overhead in a broadband wireless communication system. In a Base Station (BS), a traffic classifier classifies transmission data into a first group and a second group according to user channel information and packet sizes of the transmission data. A MAP channel configure configures a MAP channel to include information about users of the first group and positions of data for the users, information indicating whether users of the second group have succeeded in random access in a second uplink data region of a previous frame, and information about resource reservation for a current frame for the second group. A channel mapper maps the first group to a first downlink data region and maps the second group to a second downlink data region according to the MAP channel.
    Type: Application
    Filed: December 18, 2006
    Publication date: June 21, 2007
    Applicants: SAMSUNG ELECTRONICS CO., LTD., Industry-University Cooperation Foundation Sogang University
    Inventors: Jae-Hyuk Jang, Young-Bin Chang, Jung-Min Ro, Eun-Taek Lim, Dong-Seek Park, Young-Kwon Cho, Chung-Gu Kang, Il-Whan Kim
  • Publication number: 20070136648
    Abstract: The present invention relates to an iterative decoding receiver for reducing complexity of a partial sphere decoding operation in a spatial multiplexing system, and a method thereof. In the present invention, an iterative detection and decoding (IDD) method using a cost function-based iterative partial sphere decoding method and a soft cancellation-based iterative partial sphere decoding method is used to correct an initial estimation error. In a channel encoding spatial multiplexing system, since the iterative decoding receiver using decoding algorithms including a BCJR algorithm, an MPA, and a VA performs an SISO sphere decoding operation providing an optimum detection solution, the iterative decoding receiver may detect transmission symbols at a whole dimension by detecting the transmission symbols at a partial dimension, and therefore the complexity of the SISO sphere decoding operation may be greatly reduced.
    Type: Application
    Filed: June 6, 2006
    Publication date: June 14, 2007
    Inventors: Dong-Seung Kwon, Chung-Gu Kang, Hyung-Ho Park
  • Publication number: 20070047510
    Abstract: A beacon scheduling method in multi-hop ad-hoc communications is provided. This method can prevent overhead in a manner that a base station (BS) transmits beacon slot information to a carrier sense multiple access (CSMA)/collision avoidance (CA) node (CN) and a gateway (GW) through contention-free time division multiple access (TDMA) communications at initial clustering, the CN and the GW performs a sequential clustering to forward the beacon slot information to a cluster head (CH), the CH aggregates joining messages from nodes and assigns non-colliding beacon slots to the nodes, and the GW uses a beacon slot frame of a beacon transmission period (BTP) used by its selected CH in a beacon reply period (BRP) as well. Accordingly, the CH does not need to separately perform the initialization to elect the beacon slot, and the GW also does not require a separate initialization to select the beacon relay slot.
    Type: Application
    Filed: August 31, 2006
    Publication date: March 1, 2007
    Inventors: Jun-haeng Cho, Chung-gu Kang, Il-whan Kim, Kun-hyun Kim
  • Publication number: 20070019604
    Abstract: A media access control method of a wireless sensor network (WSN) is provided. The media access control method includes first sensor nodes, existing in a non-overlapping area where clusters do not overlap, media-accessing with a Time Division Multiple Access (TDMA) method and communicating with a Cluster head (CH) in a first section. Further, and the method includes second sensor nodes, existing in an overlapping area where the clusters overlap, media-accessing with a contention-based method and communicating with the CH in a second section. Because communication between nodes of the non-overlapping area where the clusters do not overlap, uses a reservation-based TDMA method, collision between nodes can be prevented, and because communication between nodes of the overlapping area where the clusters overlap, uses a contention-based CSMA/CA method, interference between neighboring clusters can be prevented.
    Type: Application
    Filed: April 28, 2006
    Publication date: January 25, 2007
    Inventors: Kyeong Hur, Chung-gu Kang, Ii-whan Kim, Ki-seok Chang
  • Publication number: 20060268745
    Abstract: A clustering method of a wireless sensor network is provided to minimize energy consumption. The clustering method includes the operations of determining a number of initial nodes within radio range of ordinary node, the ordinary nodes existing within radio range of a cluster head, and setting an ordinary node having a highest number of initial nodes among the ordinary nodes in the radio range of the cluster head, as a gateway. Because the number of usually large energy consuming cluster heads and gateways can be minimized, energy efficiency of wireless sensor network increases.
    Type: Application
    Filed: April 28, 2006
    Publication date: November 30, 2006
    Inventors: Kyeong Hur, Chung-gu Kang, Il-whan Kim, Ki-seok Chang
  • Patent number: 7096400
    Abstract: “An adaptive hybrid automatic repeat request system and method include transmitting a data frame having channel-coded data and a parity bit using an initial coding rate, receiving the data frame and performing channel decoding and correcting any error that exists. When the error is not corrected, an error degree of a corresponding frame is measured and a NACK message to which the measured error degree is added is transmitted to the transmitting terminal. A parity frame is retransmitted by channel coding a parity bit corresponding to a parity level determined in accordance with the error degree added to the NACK message, and is combined with a data bit of a data frame in which error correction fails. Channel decoding and error correction are then performed.
    Type: Grant
    Filed: September 17, 2003
    Date of Patent: August 22, 2006
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Dong-sun Lim, Chung-gu Kang, Sang-boh Yun