Patents by Inventor Hong-Sung Chang
Hong-Sung Chang 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: 7519368Abstract: In a communication system, a mobile station (MS) sends a target base station (BS) a notification indicating that it is to perform a handover from a serving BS to the target BS. The target BS transmits to the MS handover process optimization information indicating a possibility of omitting at least one process required by the MS to perform a network re-entry operation with the target BS according to the handover notification from the MS. The MS receives the handover process optimization information and performs a network re-entry operation with the target BS according to the handover process optimization information.Type: GrantFiled: January 23, 2006Date of Patent: April 14, 2009Assignee: Samsung Electronics Co., LtdInventors: Hyoung-Kyu Lim, Chang-Hoi Koo, Hong-Sung Chang, Jung-Je Son, Sung-Jin Lee, Hyun-Jeong Kang, Yeong-Moon Son
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Patent number: 7440435Abstract: A divided Media Access Control (MAC) protocol structure, a data transmission and reception method, and a handover method and system using the structure in a wireless communication system for efficiently managing session information in handover of an MSS (Mobile Subscriber Station). In the MAC protocol structure, a MAC is divided into a MAC-high layer and a MAC-low layer. The MAC-high layer performs session information-related functions and the MAC-low layer performs functions sensitive to a time delay in relation to handover of an MSS. In the handover method, when an MSS in the wireless communication system performs handover between Access Points (APs), session information is managed at a fixed position by an Access Point Controller (APC) including an MAC-high layer or a serving AP. Therefore, the system load can be reduced and communication quality can be improved.Type: GrantFiled: March 4, 2005Date of Patent: October 21, 2008Assignee: Samsung Electronics Co., LtdInventors: Geun-Hwi Lim, Tae-Won Kim, Hong-Sung Chang, Jae-Jeong Shim, Jung-Shin Park, Yong Chang, So-Hyun Kim, Seung-Il Yoon, Yeong-Moon Son
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Patent number: 7436813Abstract: Method and system by which a base station without a Global Positioning System (GPS) receiver acquires time synchronization in a Broadband Wireless Access (BWA) communication system. The method includes scanning neighbor base stations around a first base station and requesting time synchronization information from the scanned neighbor base stations by the first base station; receiving responses from predetermined neighbor base stations having already acquired time synchronization from among the neighbor base stations, the responses including time synchronization information of the predetermined neighbor base stations; and selecting a second base station from among the predetermined neighbor base stations and acquiring time synchronization based on the time synchronization information of the second base station.Type: GrantFiled: August 16, 2005Date of Patent: October 14, 2008Assignee: Samsung Electronics Co., LtdInventors: Jun-Hyung Kim, Jun-Hyuk Song, Geun-Hwi Lim, Hong-Sung Chang, Yong Chang
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Patent number: 7428227Abstract: In a method of configuring connection identifier (CID) update information in a broadband wireless access (BWA) communication system where each service between an mobile station (MS) and a base station (BS) has a unique CID, a registration request message is received from the MS, requesting updating of at least one old CID used for the MS. The CID update information is configured to include a bitmap area indicating whether a service corresponding to the at least one old CID is available, and a new CID area including at least one new CID in correspondence with a predetermined bit value in the bitmap area.Type: GrantFiled: June 23, 2005Date of Patent: September 23, 2008Assignee: Samsung Electronics Co., LtdInventors: Jung-Shin Park, Geun-Hwi Lim, Hong-Sung Chang, Yong Chang
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Publication number: 20080186889Abstract: In a method of configuring connection identifier (CID) update information in a broadband wireless access (BWA) communication system where each service between an mobile station (MS) and a base station (BS) has a unique CID, a registration request message is received from the MS, requesting updating of at least one old CID used for the MS. The CID update information is configured to include a bitmap area indicating whether a service corresponding to the at least one old CID is available, and a new CID area including at least one new CID in correspondence with a predetermined bit value in the bitmap area.Type: ApplicationFiled: April 8, 2008Publication date: August 7, 2008Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jung-Shin Park, Geun-Hwi Lim, Hong-Sung Chang, Yong Chang
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Patent number: 7400898Abstract: Provided is a method supporting a Hybrid Automatic Repeat Request (HARQ) between a subscriber station and a base station in a broadband wireless access communication system. The method includes transmitting at least one HARQ enabled uplink burst from the subscriber station to the base station; generating ACKnowledgment/Negative ACKnowledgment (ACK/NACK) information according to the received HARQ enabled uplink burst at the base station; mapping the generated ACK/NACK information to a bitmap at the base station; and transmitting the bitmap through a downlink information from the base station to the subscriber station.Type: GrantFiled: March 14, 2005Date of Patent: July 15, 2008Assignee: Samsung Electronics CO., LTDInventors: Hyon-Goo Kang, Seung-Eun Hong, Yeong-Moon Son, Geun-Hwi Lim, So-Hyun Kim, Chang-Hoi Koo, Jae-Jeong Shim, Jung-Won Kim, Jung-Shin Park, Jung-Je Son, Hong-Sung Chang
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Patent number: 7373146Abstract: Provided is a method of cross-paging including transmitting mobile terminal location information from a mobile communication system to a heterogeneous mobile communication system after the mobile terminal location registration. The mobile communication system is then requested to page the mobile terminal according to the received information in the heterogeneous mobile communication system and, then the mobile terminal is paged. Further provided is a method of cross-paging that includes determining whether the mobile terminal has been location-registered in the mobile communication system or in the heterogeneous mobile communication system with reference to pre-registered mobile terminal location information when a mobile terminal paging request occurs in the heterogeneous mobile communication system.Type: GrantFiled: January 27, 2004Date of Patent: May 13, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: Dong-Keon Kong, Tae-Won Kim, Hong-Sung Chang, Sang-Do Lee
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Patent number: 7346361Abstract: A method for controlling operation modes of a medium access control layer by a mobile subscriber station in a broadband wireless access communication system including the mobile subscriber station and a serving base station providing service to the mobile subscriber station is provided. The method includes the steps of: mode-transiting into an idle mode when there is no data transmission between the serving base station and the mobile subscriber station during a predetermined first time interval in an awake mode; detecting movement of the mobile subscriber station in the idle mode into another paging zone covering a target base station, which is different from a paging zone covering the serving base station; and mode-transiting into the awake mode and performing location update together with the target base station when the movement of the mobile subscriber station is detected.Type: GrantFiled: April 24, 2006Date of Patent: March 18, 2008Assignee: Samsung Electronics Co., LtdInventors: Hyon-Goo Kang, Bong-Gee Song, Kwang-Seop Eom, Seung-Eun Hong, Yeong-Moon Son, So-Hyun Kim, Seung-Il Yoon, Tae-Won Kim, Gaun-Hwi Lim, Jung-Shin Park, Jae-Jeong Shim, Hong-Sung Chang, Yong Chang
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Patent number: 7343167Abstract: A method for controlling operation modes of a medium access control layer by a mobile subscriber station in a broadband wireless access communication system including the mobile subscriber station and a serving base station providing service to the mobile subscriber station is provided. The method includes the steps of: mode-transiting into an idle mode when there is no data transmission between the serving base station and the mobile subscriber station during a predetermined first time interval in an awake mode; detecting movement of the mobile subscriber station in the idle mode into another paging zone covering a target base station, which is different from a paging zone covering the serving base station; and mode-transiting into the awake mode and performing location update together with the target base station when the movement of the mobile subscriber station is detected.Type: GrantFiled: April 24, 2006Date of Patent: March 11, 2008Assignee: Samsung Electronics Co., LtdInventors: Hyon-Goo Kang, Bong-Gee Song, Kwang-Seop Eom, Seung-Eun Hong, Yeong-Moon Son, So-Hyun Kim, Seung-Il Yoon, Tae-Won Kim, Geun-Hwi Lim, Jung-Shin Park, Jae-Jeong Shim, Hong-Sung Chang, Yong Chang
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Method and system for transmitting data using a safety channel in a broadband wireless access system
Patent number: 7333463Abstract: A method for allocating a safety channel to a handover subscriber station (SS) for data communication in an Orthogonal Frequency Division Multiple Access (OFDMA) communication system. In the method, a base station (BS) determines a bin offset indicating a safety channel to be allocated to the handover SS and the number of subchannels every frame, generates a MAP information element (IE) with a set indicator indicating allocation of the safety channel, the MAP IE including SS identifier information indicating the handover SS, information on the determined bin offset and information on the determined number of subchannels, and transmits the generated MAP IE at a MAP IE transmission time in the frame. The handover SS receives the MAP IE from the BS every frame, and transmits/receives data for a predetermined number of frames in the allocated safety channel according to the MAP IE.Type: GrantFiled: March 11, 2005Date of Patent: February 19, 2008Assignee: Samsung Electronics Co., LtdInventors: Jung-Shin Park, Geun-Hwi Lim, Hong-Sung Chang, Jae-Jeong Shim -
Patent number: 7330487Abstract: A method and apparatus for supporting a variety of service types in a CDMA2000 1xEV-DO mobile telecommunication system for high-speed data service in a radio communication environment. To receive multiple services according to a plurality of service types, an AT establishes a connection for the data service with a PDSN and configures a session for setting the plurality of service types having different traffic characteristics by the connection. The AT generates a plurality of service instances for the different service types according to the session configuration. It then exchanges data streams with the PDSN in a service instance corresponding to a currently provided service among the plurality of service instances.Type: GrantFiled: July 18, 2003Date of Patent: February 12, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: Hong-Sung Chang, Tae-Won Kim, Jin-Sung Cho, Tae-Ho Kim
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Publication number: 20070281702Abstract: Disclosed is a system and method for performing soft handover in a broadband wireless access communication system. An anchor base station transmits first information including channel assignment information of an active non-anchor base station when it is determined that a mobile station is to perform the soft handover, and when there are signals to be transmitted to the mobile station from the non-anchor base station, the non-anchor base station transmits second information including channel assignment information of the anchor base station when it is determined that the mobile station is to perform the soft handover, and when there are signals to be transmitted to the mobile station from the anchor base station, and the mobile station receives signals from the anchor base station and the non-anchor base station corresponding to the first information and the second information when it is determined that the mobile station is to perform the soft handover.Type: ApplicationFiled: July 3, 2007Publication date: December 6, 2007Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Geun-Hwi Lim, Jae-Jeong Shim, Hong-Sung Chang, Yong Chang, Jung-Won Kim
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Patent number: 7302264Abstract: A system and method for fast network re-entry in a broadband wireless access communication system. A mobile station transmits a first message requiring fast network re-entry to a base station and performs the fast network re-entry together with the base station when receiving a second message approving the fast network re-entry from the base station. The base station receives the first message, authenticates the first message using final session information of the mobile station that is previously stored in the base station, transmits the second message to the mobile station when succeeding in authentication of the first message, and performs the fast network re-entry together with the mobile station.Type: GrantFiled: June 10, 2005Date of Patent: November 27, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Seung-Il Yoon, Tae-Ho Kim, Jun-Hyuk Song, Hong-Sung Chang, Tae-Won Kim, Yong Chang
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Patent number: 7299048Abstract: Disclosed is a system and method for performing soft handover in a broadband wireless access communication system. An anchor base station transmits first information including channel assignment information of an active non-anchor base station when it is determined that a mobile station is to perform the soft handover, and when there are signals to be transmitted to the mobile station from the non-anchor base station, the non-anchor base station transmits second information including channel assignment information of the anchor base station when it is determined that the mobile station is to perform the soft handover, and when there are signals to be transmitted to the mobile station from the anchor base station, and the mobile station receives signals from the anchor base station and the non-anchor base station corresponding to the first information and the second information when it is determined that the mobile station is to perform the soft handover.Type: GrantFiled: June 24, 2005Date of Patent: November 20, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Geun-Hwi Lim, Jae-Jeong Shim, Hong-Sung Chang, Yong Chang, Jung-Won Kim
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Patent number: 7260072Abstract: A data push service system and method using a heterogeneous network. The system transmits push data to a Hybrid Access Terminal (HAT) in a heterogeneous mobile communication system in which at least one circuit network overlaps with at least one packet network. The HAT can be connected to a circuit network or a packet network, and is registered in a new access network. The system includes a Packet Service & Mobility Gateway (PSMG) for acquiring access state and connection information of the HAT from the circuit network and the packet network, and generating an access network switching request upon receipt of an external request signal; and a Push Proxy Gateway (PPG) for acquiring access information of the HAT which will transmit the push data from the PSMG, and transmitting a request message to the PSMG.Type: GrantFiled: September 20, 2004Date of Patent: August 21, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Sang-Do Lee, Jin-Man Kim, Tae-won Kim, Young-Ki Jeon, Jin-Soo Lee, Soo-Hoi Kim, Jin-Seok Ko, Hong-Sung Chang, Sang-Jun Moon, Je-Hyun Jung
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Publication number: 20070010262Abstract: Provided is a system and method for notifying completion of a network re-entry procedure in a communication system. In the system, a mobile station (MS) completes the network re-entry procedure with a base station (BS), and then notifies the completion of the network re-entry procedure to the BS.Type: ApplicationFiled: July 6, 2006Publication date: January 11, 2007Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Hyun-Jeong Kang, Hyoung-Kyu Lim, Hong-Sung Chang, Pan-Yuh Joo, Yeoung-Moon Son, Mi-Hyun Lee, Sung-Jin Lee, Song-Nam Hong, Jung-Je Son, Jae-Weon Cho, Young-Ho Kim
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Publication number: 20070010267Abstract: A system and method for state synchronization between a base station and a mobile station in a mobile communication system. A count value indicative of a state change of the base station is received. The received current count value is compared with a previous count value previously received and stored. If the current count value is different from the previous count value, the mobile station performs a network entry procedure with the base station.Type: ApplicationFiled: July 6, 2006Publication date: January 11, 2007Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Yeong-Moon Son, Hong-Sung Chang, Pan-Yuh Joo, Jung-Je Son, Jae-Weon Cho, Mi-Hyun Lee, Hyun-Jeong Kang, Song-Nam Hong, Sung-Jin Lee, Hyoung-Kyu Lim, Young-Ho Kim
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Publication number: 20060194581Abstract: A method for controlling operation modes of a medium access control layer by a mobile subscriber station in a broadband wireless access communication system including the mobile subscriber station and a serving base station providing service to the mobile subscriber station is provided. The method includes the steps of: mode-transiting into an idle mode when there is no data transmission between the serving base station and the mobile subscriber station during a predetermined first time interval in an awake mode; detecting movement of the mobile subscriber station in the idle mode into another paging zone covering a target base station, which is different from a paging zone covering the serving base station; and mode-transiting into the awake mode and performing location update together with the target base station when the movement of the mobile subscriber station is detected.Type: ApplicationFiled: April 24, 2006Publication date: August 31, 2006Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Hyon-Goo Kang, Bong-Gee Song, Kwang-Seop Eom, Seung-Eun Hong, Yeong-Moon Son, So-Hyun Kim, Seung-II Yoon, Tae-Won Kim, Geun-Hwi Lim, Jung-Shin Park, Jae-Jeong Shim, Hong-Sung Chang, Yong Chang
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Publication number: 20060189318Abstract: A method for controlling operation modes of a medium access control layer by a mobile subscriber station in a broadband wireless access communication system including the mobile subscriber station and a serving base station providing service to the mobile subscriber station is provided. The method includes the steps of: mode-transiting into an idle mode when there is no data transmission between the serving base station and the mobile subscriber station during a predetermined first time interval in an awake mode; detecting movement of the mobile subscriber station in the idle mode into another paging zone covering a target base station, which is different from a paging zone covering the serving base station; and mode-transiting into the awake mode and performing location update together with the target base station when the movement of the mobile subscriber station is detected.Type: ApplicationFiled: April 24, 2006Publication date: August 24, 2006Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Hyon-Goo Kang, Bong-Gee Song, Kwang-Seop Eom, Seung-Eun Hong, Yeong-Moon Son, So-Hyun Kim, Seung-Il Yoon, Tae-Won Kim, Geun-Hwl Lim, Jung-Shin Park, Jae-Jeong Shim, Hong-Sung Chang, Yong Chang
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Publication number: 20060166672Abstract: In a communication system, a mobile station (MS) sends a target base station (BS) a notification indicating that it is to perform a handover from a serving BS to the target BS. The target BS transmits to the MS handover process optimization information indicating a possibility of omitting at least one process required by the MS to perform a network re-entry operation with the target BS according to the handover notification from the MS. The MS receives the handover process optimization information and performs a network re-entry operation with the target BS according to the handover process optimization information.Type: ApplicationFiled: January 23, 2006Publication date: July 27, 2006Applicant: Samsung Electronics Co., Ltd.Inventors: Hyoung-Kyu Lim, Chang Koo, Hong-Sung Chang, Jung-Je Son, Sung-Jin Lee, Hyun-Jeong Kang, Yeong-Moon Son