Patents by Inventor Guang Cheng
Guang Cheng 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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Publication number: 20110089916Abstract: Embodiments of the invention are related to LDO regulators. In an embodiment, an amplifier drives the gate of a master source follower and of at least one slave source follower to form an LDO regulator. In an alternative embodiment, a charge pump drives the master source follower to form the regulator. Additional slave source followers may be used in conjunction with the charge pump and the master source follower to improve the regulator performance. Other embodiments are also disclosed.Type: ApplicationFiled: August 16, 2010Publication date: April 21, 2011Applicant: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD.Inventors: Eric Soenen, Alan Roth, Justin Shi, Ying-Chih Hsu, Guang-Cheng Wang, Wen-Shen Chou
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Publication number: 20110053599Abstract: A method for a handover procedure comprises detecting a status of a backhaul connection between an original femto base station and a backbone network, and sending a handover request message including a reason code and/or flag to at least one mobile station served by the original femto base station, then the at least one mobile station re-associates with at least one base station other than the original femto base station.Type: ApplicationFiled: August 27, 2010Publication date: March 3, 2011Applicant: BROADBAND WIRELESS TECHNOLOGY CORP.Inventors: Hsien-Tsung Hsu, Yung-Ting Lee, Hua-Chiang Yin, Whai-En Chen, Ray-Guang Cheng
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Patent number: 7884643Abstract: A voltage level shifting circuit for an integrated circuit system having an internal low voltage power supply (VCCL) and an external high voltage power supply (VCCH) is disclosed, the voltage level shifting circuit comprises a pair of cross coupled PMOS transistors connected to the VCCH, a NMOS transistor with a source connected to a ground (VSS) and a gate connected to a first signal swinging between the VCCL and the VSS, and a switching device coupled between a drain of one of the pair of PMOS transistors and a drain of the NMOS transistor, wherein the pair of PMOS transistors are high voltage transistors and the switching device is off when the VCCL is below a predetermined voltage level, and the switching device is on when the VCCL is above the predetermined voltage level.Type: GrantFiled: June 29, 2009Date of Patent: February 8, 2011Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.Inventors: Guang-Cheng Wang, Ker-Min Chen, Kuo-Ji Chen
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Patent number: 7822009Abstract: A system for data communication in a wireless mesh network that comprises a wired gateway, and a plurality of nodes stationary with respect to each other being disposed in a pattern including at least one path, each of the plurality of nodes located in the at least one path having a transmission range overlapped with that of an immediate adjacent node located in the at least one path, further comprising a node connected to the wired gateway, and an end node located at one end of the at least one path remote from the gateway-connected node, wherein each of a subset of the plurality of nodes, wherein said subset excludes the gateway connected node and the end node, operates in one of a first state in which a first node of the subset is ready to transmit a data frame, a second state at which a second node in the subset is prohibited from transmitting or receiving a data frame and a third state at which a third node in the subset is ready to receive a data frame.Type: GrantFiled: May 5, 2006Date of Patent: October 26, 2010Assignee: Industrial Technology Research InstituteInventors: Ray-Guang Cheng, Cun-Yi Wang, Jen-Shun Yang
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Publication number: 20100189025Abstract: The invention is directed to a method for receiving a feedback for at least a multicast broadcast service flow transmitting to a plurality of subscriber stations. The method comprises steps of assigning a plurality of code division multiple access (CDMA) codes to a feedback corresponding to the multicast broadcast service flow and then performing an allocation process for allocating a feedback channel for the subscriber stations. Thereafter, an announcement process is performed to announce a multiple feedback condition, the CDMA codes and the feedback channel to the subscriber stations. A channel monitoring process is performed for receiving a negative-acknowledgment (NACK)-based feedback sending from one of the subscriber stations unsatisfied with the multiple feedback condition and the NACK-based feedback is in a form of one of CDMA codes corresponding to the multicast broadcast service flow and is transmitted through the feedback channel.Type: ApplicationFiled: January 23, 2009Publication date: July 29, 2010Applicant: National Taiwan University of Science and TechnologyInventor: Ray-Guang Cheng
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Publication number: 20100182906Abstract: A method for managing a call admission controller in a multi-hop wireless backhaul network is illustrated. The method provides a call access control mechanism in a multi-hop wireless backhaul network system by calculating at least one service quality parameter in the network and determining if service data transmitted from relay nodes is allowed to enter a gateway of the network according to the at least one service quality parameter. In exemplary embodiments of present invention, the service quality parameter includes a throughput, an average delay of packets, a number of remote devices, a packet loss rate, a number of the relay nodes, and an amount of service data of a specific class traffic in the network. A topology of the network may be a ring, a chain, or a tree topology, and a ripple protocol is utilized as media access control protocol in the network.Type: ApplicationFiled: April 7, 2009Publication date: July 22, 2010Applicant: National Taiwan University of Science and TechnologyInventors: Ray-Guang Cheng, Ping-Chen Lin
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Publication number: 20100135196Abstract: A method for providing resource allocation in a communication network includes identifying at least two broadcast zones for receiving broadcast services in the communication network and generating a first index based on a relative relationship among the at least two broadcast zones. The first index includes information indicative of whether a first broadcast zone overlaps with at least one other broadcast zone. The method further includes generating a second index based on the relative relationship among the at least two broadcast zones; assigning at least one identifier to each of the at least two broadcast zones based on the first index and the second index; and enabling data transmissions to the at least two broadcast zones based on the assigned identifiers and using the at least one communication resource associated with the identifiers. The second index may include information indicative of a number of broadcast zones overlapped with the first broadcast zone.Type: ApplicationFiled: November 20, 2009Publication date: June 3, 2010Inventors: Ray-Guang CHENG, Kuo-Jui HUANG, Jen-Shun YANG
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Publication number: 20100026366Abstract: A voltage level shifting circuit for an integrated circuit system having an internal low voltage power supply (VCCL) and an external high voltage power supply (VCCH) is disclosed, the voltage level shifting circuit comprises a pair of cross coupled PMOS transistors connected to the VCCH, a NMOS transistor with a source connected to a ground (VSS) and a gate connected to a first signal swinging between the VCCL and the VSS, and a switching device coupled between a drain of one of the pair of PMOS transistors and a drain of the NMOS transistor, wherein the pair of PMOS transistors are high voltage transistors and the switching device is off when the VCCL is below a predetermined voltage level, and the switching device is on when the VCCL is above the predetermined voltage level.Type: ApplicationFiled: June 29, 2009Publication date: February 4, 2010Inventors: Guang-Cheng Wang, Ker-Min Chen, Kuo-Ji Chen
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Patent number: 7653041Abstract: This invention provides a method for power-efficient transmission supporting integrated service over WLAN. The said invention combines the polling-based and the contention-based mechanisms, named on-demand polling (ODP). In the ODP scheme, a voice station is in the polling list when it is in the active mode. During the idle mode, it is configured to operate in the sleep mode for saving power. Also, it adopts the contention-based mechanism to join the list again while returning from the idle mode. On the other hand, the data station adopts the contention-based mechanism to transmit its packets over WLAN. In addition, to achieve service differentiation, the said invention also employs a prioritized access probability for voice over data services. Simulation results show that the said invention can reduce the power consumption for voice stations and enhance the throughput for data stations.Type: GrantFiled: May 12, 2005Date of Patent: January 26, 2010Assignee: National Chiao Tung UniversityInventors: Chih-Yung Shih, Ray-Guang Cheng, Chung-Ju Chang, Yih-Shen Chen
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Patent number: 7611589Abstract: A method for spin-on wafer cleaning. The method comprises controlling spin speed and vertical water jet pressure. The vertical jet pressure and the spin speed are substantially maintained in inverse proportion. Wafer spin speed is between 50 to 1200 rpm. Vertical wafer jet pressure is between 0.05 to 100 KPa.Type: GrantFiled: March 4, 2005Date of Patent: November 3, 2009Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.Inventors: Jun Wu, Dong-Xuan Lu, Shih-Chi Lin, Wen-Long Lee, Yi-An Jian, Guang-Cheng Wang, Shiu-Ko JangJian, Chyi-Tsong Ni, Szu-An Wu, Ying-Lang Wang
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Publication number: 20090055909Abstract: A data transmission method with multiple token mechanism in wireless token ring protocol is provided. First, (a) a logical ring with M nodes is provided; (b) a k-th node is selected from the logical ring, and a token in the k-th node is generated; (c) a first message is sent to a (k+1)-th node from the k-th node with the token, and whether the (k+1)-th node responds a second message is judged, if yes, the data to be transmitted is transmitted from the k-th node, otherwise, the token of the k-th node is eliminated; (d) the token is sent to the (k+1)-th node from the k-th node after completing the transmission of the transmitted data of the k-th node, a generation token sequence is generated in a i-th node, and sent to a (i?1)-th node; and (e) the token is generated for the (i?1)-th node with the generation token sequence.Type: ApplicationFiled: January 7, 2008Publication date: February 26, 2009Applicant: National Taiwan University of Science and TechnologyInventors: Ray-Guang Cheng, Ruei-I Chang
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Patent number: 7489919Abstract: A method and a system for wireless terminals registering a communication system, comprising wireless terminals, public land mobile network (PLMN), wireless local area network (WLAN), Wherein the wireless terminals are able to communicate with both the PLMN and the WLAN. The PLMN coverage overlaps the WLAN coverage linking the two together. First, the wireless terminal obtains an ID, attaches to a PLMN, and then transmits the ID to PLMN to authenticate and register. After authentication, the PLMN generates an authentication code and transmits the code to a wireless terminal. Additionally, the PLMN transmit the authentication code to at least one WLAN. The wireless terminals must communicate with at least one WLAN.Type: GrantFiled: September 8, 2004Date of Patent: February 10, 2009Assignee: Qisda CorporationInventor: Ray-Guang Cheng
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Publication number: 20090003371Abstract: A method for transmitting packets and a network system thereof are provided. In the present invention, each packet entering the network system is added an assigning tag to indicate the arrival time of the packet, and at least two queues in a node of the network system are used for respectively sorting the local packets of the node and the relayed packets of the preceding node. The order of the packet for transmitting can be decided by comparing the assigning tags of the two packets positioned at first order in different queues. Therefore, a condition of First-In First-Out (FIFO) is satisfied in the network system, and the sequence for transmitting packets is arbitrated fair.Type: ApplicationFiled: November 8, 2007Publication date: January 1, 2009Applicant: National Taiwan University of Science and TechnologyInventors: Ray-Guang Cheng, Li-Hung Liao
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Publication number: 20080171553Abstract: A system for channel selection management in a wireless communication network. The system includes a memory module configured to store at least one channel condition related to at least one infrastructure station among a plurality of infrastructure stations in the wireless communication network, wherein each of the plurality of infrastructure stations is able to monitor a channel condition of a channel between the each infrastructure station and a mobile station; a compare module configured to compare a channel condition related to one of the plurality of infrastructure stations with a threshold and provide a signal for a comparison result; a control module configured to provide a control information based on the signal from the compare module; and a selection module configured to select one of the at least one infrastructure station and notify the selected infrastructure station to serve the mobile station based on the control information from the control module.Type: ApplicationFiled: January 7, 2008Publication date: July 17, 2008Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Fang-Ching REN, Ray-Guang CHENG, Chie-Ming CHOU, Kun-Ying HSIEH
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Patent number: 7359356Abstract: The present invention provides an overflow control method for frame synchronization of base stations in wireless communication network system. The wireless communication network system includes a radio network controller, a first base station, a second base station, and a mobile unit. The radio network controller transmits a plurality of data frames to the first base station and the second base station. The present invention includes the following steps. First, determine whether number of the plurality of data frames received by the second base station is larger than a judging storage capacity. Second, calculate an X and delete X of data frames from the second base station if the number is larger. The X is equal to the result of subtracting the judging storage capacity from the number. Meanwhile, detect a link quality between the mobile unit and the first base station.Type: GrantFiled: August 26, 2003Date of Patent: April 15, 2008Assignee: Benq CorproationInventors: Phone Lin, Yi-Bing Lin, Guan-Hua Tu, Ray-Guang Cheng
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Patent number: 7289468Abstract: The present invention relates to a scheduling unit in a wireless communication system. For sequentially receiving a plurality of Protocol Data Units (PDUs) in a plurality of communication sessions, accumulate and schedule the plurality of PDUs during a predetermined time frame, and transmit the PDUs based on a maximum power-strength of the wireless communication system. The scheduling unit comprises a time-based scheduler and a power-based scheduler. When the power-based scheduler schedules the PDUs, if the total sum of the required power of the PDUs exceeds the maximum power-strength of the wireless communication system, the power-based scheduler sends back to the time-based scheduler the PDUs whose power amounts to the exceeding of the maximum power-strength of the wireless communication system according to the corresponding priority values of the PDUs, so that the wireless communication system transmits all at a time the remaining PDUs whose total power remains within the maximum power-strength.Type: GrantFiled: March 14, 2003Date of Patent: October 30, 2007Assignee: Benq CorporationInventors: Jen-Shun Yang, Ray-Guang Cheng, Chien-Chao Tseng
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Publication number: 20060268797Abstract: A system for data communication in a wireless mesh network that comprises a wired gateway, and a plurality of nodes stationary with respect to each other being disposed in a pattern including at least one path, each of the plurality of nodes located in the at least one path having a transmission range overlapped with that of an immediate adjacent node located in the at least one path, further comprising a node connected to the wired gateway, and an end node located at one end of the at least one path remote from the gateway-connected node, wherein each of a subset of the plurality of nodes, wherein said subset excludes the gateway connected node and the end node, operates in one of a first state in which a first node of the subset is ready to transmit a data frame, a second state at which a second node in the subset is prohibited from transmitting or receiving a data frame and a third state at which a third node in the subset is ready to receive a data frame.Type: ApplicationFiled: May 5, 2006Publication date: November 30, 2006Applicants: Industrial Technology Research InstituteInventors: Ray-Guang Cheng, Cun-Yi Wang, Jen-Shun Yang
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Publication number: 20060256765Abstract: This invention provides a method for power-efficient transmission supporting integrated service over WLAN. The said invention combines the polling-based and the contention-based mechanisms, named on-demand polling (ODP). In the ODP scheme, a voice station is in the polling list when it is in the active mode. During the idle mode, it is configured to operate in the sleep mode for saving power. Also, it adopts the contention-based mechanism to join the list again while returning from the idle mode. On the other hand, the data station adopts the contention-based mechanism to transmit its packets over WLAN. In addition, to achieve service differentiation, the said invention also employs a prioritized access probability for voice over data services. Simulation results show that the said invention can reduce the power consumption for voice stations and enhance the throughput for data stations.Type: ApplicationFiled: May 12, 2005Publication date: November 16, 2006Inventors: Chih-Yung Shih, Ray-Guang Cheng, Chung-Ju Chang, Yih-Shen Chen
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Publication number: 20060196526Abstract: A method for spin-on wafer cleaning. The method comprises controlling spin speed and vertical water jet pressure. The vertical jet pressure and the spin speed are substantially maintained in inverse proportion. Wafer spin speed is between 50 to 1200 rpm. Vertical wafer jet pressure is between 0.05 to 100 KPa.Type: ApplicationFiled: March 4, 2005Publication date: September 7, 2006Inventors: Jun Wu, Dong-Xuan Lu, Shih-Chi Lin, Wen-Long Lee, Yi-An Jian, Guang-Cheng Wang, Shiu-Ko JangJian, Chyi-Tsong Ni, Szu-An Wu, Ying-Lang Wang
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Patent number: 7091336Abstract: The present invention discloses an antineoplastic sterile lyophilized powder of lentinan and the process of preparation thereof. The lyophilized powder of lentinan is essentially consisted of 0.50–1.40 parts of lentinan and 50–140 parts of excipient for lyophilization, based on weight. It has good stability. It has improved safety as it does not contain dextran which may cause allergic side effect.Type: GrantFiled: February 28, 2001Date of Patent: August 15, 2006Assignee: Nanjing Zhenzhong Bioengineering Co., Ltd.Inventors: Pei Yuan Cheng, Jing Weng, Yi Gong Fang, Guang Cheng