Patents by Inventor Zongchuang Liang
Zongchuang Liang 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: 9144105Abstract: The present invention provides a deactivation method of multimedia broadcast multicast service for wireless communication system, comprising steps of: in SGSN, completing the context deactivation of user equipment of broadcast multicast service; in the user equipment, completing the context deactivation of user equipment of multimedia broadcast multicast service; in GGSN, completing the context deactivation of user equipment of multimedia broadcast multicast service; characterized by further comprising steps of: in SGSN, after completing the context deactivation of user equipment of multimedia broadcast multicast service, completing the context deactivation of user equipment of multimedia broadcast multicast service in a radio network controller of a radio access network.Type: GrantFiled: August 30, 2005Date of Patent: September 22, 2015Assignee: Alcatel LucentInventors: Hua Chao, Xin Xu, Zongchuang Liang, Yonggang Wang, He Wang, Nan Wang, Yu Chen
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Patent number: 8891648Abstract: A system for transmitting and receiving Channel State Information (CSI) is provided, in which a terminal receives a pilot signal transmitted from a transmitter, the terminal estimates CSI of part of downlink channels based on the received pilot signal, the terminal superposes the CSI of part of downlink channels onto a uplink sounding signal orthogonally, and transmits them together; the transmitter obtains the CSI of the rest part of downlink channels by estimating the uplink sounding signal, the transmitter performs orthogonal de-multiplexing on the received signal to obtain the CSI of the part of downlink channels, the transmitter, by using the CSI of the two parts of downlink channels, pre-codes downlink data and transmits it to the terminal.Type: GrantFiled: August 21, 2009Date of Patent: November 18, 2014Assignee: Samsung Electronics Co., Ltd.Inventors: Lei Zhou, Zheng Zhao, Zongchuang Liang
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Patent number: 8730797Abstract: A method for forwarding direct message in partial function OFDMA relay system is proposed in present invention. In present invention, the operations like forwarding and reflecting are fixed for the PFRS. Therefore, the BS performs scheduling according to the fixed operations so as to make the PFRS actually has the function of direct message forwarding.Type: GrantFiled: April 25, 2008Date of Patent: May 20, 2014Assignees: Samsung Electronics Co., Ltd, Beijing Samsung Telecom R&D CenterInventors: Eun-Taek Lim, Hyoung-Kyu Lim, Pan-Yuh Joo, Qi Wu, Zongchuang Liang
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Patent number: 8451926Abstract: A signal processing method in an MIMO multi-carrier system is disclosed comprising: receiving by a receiver signals of a plurality of sub-carriers transmitted from a transmitter; dividing the sub-carriers into a plurality of sub-carrier blocks according to the correlation between adjacent sub-carriers, each sub-carrier block containing K sub-carriers; selecting a feedback sub-carrier pre-coding matrix ( ) and a rotation matrix ( ) for each sub-carrier block, and then sending the information on the pre-coding matrix and the rotation matrix back to the transmitting end. The present invention provides the method and device for effectively settling the feedback problem in an MIMO/OFDMA system, thereby greatly reducing the number of pre-coding weight matrices needed to feed back to the transmitting device.Type: GrantFiled: December 26, 2008Date of Patent: May 28, 2013Assignees: Samsung Electronics Co., Ltd., Beijing Samsung Telecom R&D CenterInventors: Jinxia Cheng, Hong He, Zongchuang Liang
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Patent number: 7995514Abstract: A Relay System (RS)-based cellular network transmission method for MT having a function of single input and single output is provided. The method includes transmitting broadcast information to all RSs and Mobile Terminals (MTs); transmitting required data to each RS in an Orthogonal Frequency Division Multiplexing (OFDM) mode; performing the operations of selection of modulation scheme, addition of CP, addition of symbols for channel estimation and selection of OFDM symbols; feeding feedback information to the Base Station (BS); transmitting a synchronization request to the BS; transmitting a synchronization acknowledgement to the RS; transmitting information to each MT belonging to the BS; transmitting information to each MT belonging to the RS; the MT belonging to the BS transmitting ACK/NACK information to the BS; the MT belonging to the RS transmitting ACK/NACK information to the BS; and the BS informing the RS of the received ACK/NACK information.Type: GrantFiled: April 28, 2008Date of Patent: August 9, 2011Assignee: Samsung Electroncis Co., LtdInventors: Eun-Taek Lim, Zongchuang Liang, Qi Wu
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Publication number: 20110150117Abstract: A system for transmitting and receiving channel state information (CSI) is provided, in which a terminal receives a pilot signal transmitted from a transmitter; the terminal estimates CSI of part of downlink channels based on the received pilot signal; the terminal superposes the CSI of part of downlink channels onto a uplink sounding signal orthogonally, and transmits them together; the transmitter obtains the CSI of the rest part of downlink channels by estimating the uplink sounding signal; the transmitter performs orthogonal de-multiplexing on the received signal to obtain the CSI of the part of downlink channels; the transmitter, by using the CSI of the two parts of downlink channels, pre-codes downlink data and transmits it to the terminal. With the system of the present invention, it is possible to solve the problem that the transmitter can not obtain complete CSI due to the fact that uplink and downlink antenna configurations are not matched with each other.Type: ApplicationFiled: August 21, 2009Publication date: June 23, 2011Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Lei Zhou, Zheng Zhao, Zongchuang Liang
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Publication number: 20100290372Abstract: The method for multiple TDD systems coexistence comprising steps of: a newly deployed system calculating a relative time offset ?t for a corresponding frame; the newly deployed system transmitting uplink and downlink signals based on a time reference information obtained by a summation of the relative time offset ?t and a time reference of an existing system. With the method proposed in present invention, uplink and downlink interference from adjacent frequency bands and from adjacent carriers in the same frequency band can be greatly reduced and a transmission time utility can be guaranteed for a newly deployed system.Type: ApplicationFiled: January 9, 2009Publication date: November 18, 2010Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Chuan Zhong, Hong He, Xufeng Zheng, Zongchuang Liang, Ho-Kyu Choi, Jae-Weon Cho, Jung-Je Son
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Publication number: 20100266061Abstract: A signal processing method in an MIMO multi-carrier system is disclosed comprising: receiving by a receiver signals of a plurality of sub-carriers transmitted from a transmitter; dividing the sub-carriers into a plurality of sub-carrier blocks according to the correlation between adjacent sub-carriers, each sub-carrier block containing K sub-carriers; selecting a feedback sub-carrier pre-coding matrix ( ) and a rotation matrix ( ) for each sub-carrier block, and then sending the information on the pre-coding matrix and the rotation matrix back to the transmitting end. The present invention provides the method and device for effectively settling the feedback problem in an MIMO/OFDMA system, thereby greatly reducing the number of pre-coding weight matrices needed to feed back to the transmitting device.Type: ApplicationFiled: December 26, 2008Publication date: October 21, 2010Applicants: SAMSUNG ELECTRONICS CO., LTD., BEIJING SAMSUNG TELECOM R&D CENTERInventors: Jinxia Cheng, Hong He, Zongchuang Liang
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Publication number: 20100214973Abstract: A method for forwarding direct message in partial function OFDMA relay system is proposed in present invention. In present invention, the operations like forwarding and reflecting are fixed for the PFRS. Therefore, the BS performs scheduling according to the fixed operations so as to make the PFRS actually has the function of direct message forwarding.Type: ApplicationFiled: April 25, 2008Publication date: August 26, 2010Inventors: Eun-Taek Lim, Hyoung-Kyu Lim, Pan-Yuh Joo, Qi Wu, Zongchuang Liang
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Publication number: 20100097973Abstract: An apparatus and method for idle mode notification in a cellular communications system is provided. A user transmits, prior to entering an idle mode, a de-registration request message to a Base Station (BS) which then transmits a Dynamic Service Addition REQuest (DSA-REQ) message to the user and adds the user to a multicast group for the idle mode, and enters the idle mode. The BS transmits an idle mode notification to the user using a Multicast/Broadcast Service MAP (MBS_MAP), and the user receives the idle mode notification, wherein the user switches to a unicast carrier to perform network reentry if the idle mode notification is a network reentry notification. The idle mode notification is considered as a service of an MBS type. When a user enters the idle mode, the BS actively invites the user to join the multicast group for idle mode notification if the MBS operates on a dedicated carrier.Type: ApplicationFiled: October 16, 2009Publication date: April 22, 2010Applicants: SAMSUNG ELECTRONICS CO. LTD., BEIJING SAMSUNG TELECOM R & D CENTERInventors: Qi WU, Zongchuang LIANG
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Patent number: 7583702Abstract: The present invention discloses a method of transmitting a first signal and a second signal in a wideband code-division multiple access network, wherein a probability of the appearance of signal bit “1” or “0” in each signal of the first signal and the second signal is remarkably higher than a probability of the appearance of “0” or “1”, the method including: a step of determining constellation points, for determining combinations of different states of the first signal and the second signal and for determining each combination as a constellation point; a step of determining locations of constellation points, for determining a location of each constellation point on I-Q plane based on a priori knowledge of said combination; and a step of transmission, for, after modulating said different combinations in different ways according to the location of each constellation point, transporting them to a user equipment via a physical channel.Type: GrantFiled: December 7, 2005Date of Patent: September 1, 2009Assignee: Alcatel LucentInventors: Zongchuang Liang, Hua Chao, Xin Xu, Luoning Gui
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Publication number: 20080267113Abstract: A Relay System (RS)-based cellular network transmission method for MT having a function of single input and single output is provided. The method includes transmitting broadcast information to all RSs and Mobile Terminals (MTs); transmitting required data to each RS in an Orthogonal Frequency Division Multiplexing (OFDM) mode; performing the operations of selection of modulation scheme, addition of CP, addition of symbols for channel estimation and selection of OFDM symbols; feeding feedback information to the Base Station (BS); transmitting a synchronization request to the BS; transmitting a synchronization acknowledgement to the RS; transmitting information to each MT belonging to the BS; transmitting information to each MT belonging to the RS; the MT belonging to the BS transmitting ACK/NACK information to the BS; the MT belonging to the RS transmitting ACK/NACK information to the BS; and the BS informing the RS of the received ACK/NACK information.Type: ApplicationFiled: April 28, 2008Publication date: October 30, 2008Applicants: SAMSUNG ELECTRONICS CO., LTD., BEIJING SAMSUNG TELECOM R&D CENTERInventors: Eun-Taek LIM, Zongchuang Liang, Qi Wu
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Publication number: 20070258529Abstract: A method of orthogonalizing signals transmitted from a BS in an OFDMA system, at a transmitting end, includes a) performing encoding, interleaving and modulation on original information bits; b) allocating sub-carriers with equivalent intervals to a sub-channel, and dividing channels into two parts of a cell edge user channel and a center area channel; c) mapping modulated information symbols to the corresponding sub-carriers; d) performing orthogonalizing processing on the two parts of channels; e) for a user at an edge of the cell, according to result of step b), dividing an OFDM symbol into subsections of equal length; f) multiplying the subsections obtained from step e) by a corresponding orthogonalizing sequence of the cell; g) adding the OFDM symbols of the two parts together to form a whole OFDM symbol; h) adding a cyclic prefix for the system; and i) performing D/A conversion, RF processing and feedback over a transmitting antenna on a base-band signal.Type: ApplicationFiled: April 25, 2007Publication date: November 8, 2007Applicants: Samsung Electronics Co., LTD, Beijing Samsung Telecom R&D CenterInventors: Zongchuang Liang, Dong-Seek Park, Chang-Yoon Oh, Young-Kwon Cho, Sung-Kwon Hong
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Publication number: 20060128433Abstract: The present invention discloses a method of transmitting a notification indicator of multimedia broadcast/multicast services in wideband code-division multiple access, the method including: a step of extracting notification indicator information by a radio network controller from a notification message of the multimedia broadcast/multicast services; a step of transmitting the notification indicator information to physical layer and building a notification indicator channel frame via a frame protocol layer; and a step of transmitting the notification indicator channel frame to user terminals via a physical channel. According to the method of transmitting a notification indicator of the present invention, user terminals can accurately read the notification indicator within the time length of one frame, so that the false alarm ratio and transmission power of the notification indicator are reduced.Type: ApplicationFiled: December 7, 2005Publication date: June 15, 2006Inventors: Zongchuang Liang, Hua Chao, Xin Xu, Luoning Gui
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Publication number: 20060128400Abstract: The present invention discloses a method of transmitting a first signal and a second signal in a wideband code-division multiple access network, wherein a probability of the appearance of signal bit “1” or “0” in each signal of the first signal and the second signal is remarkably higher than a probability of the appearance of “0” or “1”, the method including: a step of determining constellation points, for determining combinations of different states of the first signal and the second signal and for determining each combination as a constellation point; a step of determining locations of constellation points, for determining a location of each constellation point on I-Q plane based on a priori knowledge of said combination; and a step of transmission, for, after modulating said different combinations in different ways according to the location of each constellation point, transporting them to a user equipment via a physical channel.Type: ApplicationFiled: December 7, 2005Publication date: June 15, 2006Inventors: Zongchuang Liang, Hua Chao, Xin Xu, Luoning Gui
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Publication number: 20060056396Abstract: The present invention provides a deactivation method of multimedia broadcast multicast service for wireless communication system, comprising steps of: in SGSN, completing the context deactivation of user equipment of broadcast multicast service; in the user equipment, completing the context deactivation of user equipment of multimedia broadcast multicast service; in GGSN, completing the context deactivation of user equipment of multimedia broadcast multicast service; characterized by further comprising steps of: in SGSN, after completing the context deactivation of user equipment of multimedia broadcast multicast service, completing the context deactivation of user equipment of multimedia broadcast multicast service in a radio network controller of a radio access network.Type: ApplicationFiled: August 30, 2005Publication date: March 16, 2006Inventors: Hua Chao, Xin Xu, Zongchuang Liang, Yonggang Wang, He Wang, Nan Wang, Yu Chen