Patents by Inventor Chia-Lung Liu
Chia-Lung Liu 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: 20170104572Abstract: A method for interference mitigation, a network server, and a base station are provided. The method for interference mitigation includes the following steps. A transmitting group is created by grouping a first base station and a first user equipment, the transmitting group including multiple transmitting antennas. A receiving group is created by grouping a second base station and a second user equipment, the receiving group comprising multiple receiving antennas. Channel information between each transmitting antenna and each receiving antenna is obtained to calculate multiple interference coefficients between each transmitting antenna and each receiving antenna. Precoding is performed on the transmitting antennas according to the interference coefficients.Type: ApplicationFiled: December 28, 2015Publication date: April 13, 2017Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Chia-Lung LIU, Guan-Hsien DU, Fu-Te HSU
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Patent number: 9532297Abstract: A software defined network (SDN) and a corresponding mobility management method and a corresponding controller are provided. The SDN includes a controller, a plurality of switches and a plurality of edge devices. The controller manages a topology and routing actions of the SDN. When a user equipment (UE) attaches to a target edge device in the edge devices, the target edge device transmits a notification message to the controller. The controller updates flow entries in the switches and the edge devices according to the notification message.Type: GrantFiled: November 28, 2014Date of Patent: December 27, 2016Assignee: Industrial Technology Research InstituteInventors: Kuei-Li Huang, Chai-Hien Gan, Chia-Lung Liu
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Patent number: 9414393Abstract: A base station and a resource allocation method are provided. The method includes: calculating transmission rates of user equipment (UE) on unallocated resource blocks; finding consecutive resource block (RB) sets within the unallocated resource blocks according to a predetermined window size; finding minimum transmission rates of the UE among the transmission rates respectively corresponding to the consecutive RB sets; finding a largest value and a second largest value corresponding to each of the consecutive RB sets among the minimum transmission rates corresponding to the UE; calculating absolute difference values between the largest value and the second largest value corresponding to each of the consecutive RB sets; finding a maximum absolute difference value from the absolute difference values corresponding to the consecutive RB sets; and allocating the consecutive RB set corresponding to the maximum absolute difference value to the specific UE.Type: GrantFiled: March 20, 2014Date of Patent: August 9, 2016Assignee: Industrial Technology Research InstituteInventors: Chia-Lung Liu, Hsi-Lu Chao, Lung-Han Hsu, Chia-Kai Chang
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Patent number: 9357453Abstract: A home base station and method for supporting a plurality of cells under carrier aggregation. The home base station includes a preamble generator and a preamble monitor. The preamble generator allocates respective random access resources in the cells for handover to be carried out by a user equipment (UE), and upon receiving a handover request signal transmitted by a Mobility Management Entity (MME), generates a specific preamble and its transmission time, so that the UE performs random access on the cells based on the preamble and the transmission time to obtain the random access resources and sends out a Random Access Preamble (RAP). The preamble monitor enables the cells to simultaneously monitor the RAP sent by the UE, and when one of the cells receiving the RAP, identifies the cell on which the UE camps based on which one of the cells that has the RAP.Type: GrantFiled: May 27, 2014Date of Patent: May 31, 2016Assignee: Industrial Technology Research InstituteInventors: Chia-Lung Liu, Kuei-Li Huang, Ching-Hsu Chang
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Publication number: 20160135111Abstract: A software defined network (SDN) and a corresponding mobility management method and a corresponding controller are provided. The SDN includes a controller, a plurality of switches and a plurality of edge devices. The controller manages a topology and routing actions of the SDN. When a user equipment (UE) attaches to a target edge device in the edge devices, the target edge device transmits a notification message to the controller. The controller updates flow entries in the switches and the edge devices according to the notification message.Type: ApplicationFiled: November 28, 2014Publication date: May 12, 2016Inventors: Kuei-Li Huang, Chai-Hien Gan, Chia-Lung Liu
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Publication number: 20150341831Abstract: A base station and a method that reduce abnormal cell re-selection behaviors.Type: ApplicationFiled: November 6, 2014Publication date: November 26, 2015Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Chia-Lung Liu, Mu-Liang Wang, Guan-Hsien Du
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Patent number: 9107122Abstract: A method and an apparatus for correcting wireless signal quality are provided. The apparatus includes an abnormality detector and a quality adjuster. The abnormality detector collects multiple measurement values reported by a user equipment (UE), calculates a variation degree value according to the measurement values, and compares the variation degree value with a predetermined threshold value. The measurement values are generated by the UE when the UE measures the wireless signal quality of an evolved node B. The measurement values include a first reference signal receiving quality (RSRQ) of the evolved node B. When the variation degree value is larger than the predetermined threshold value, the quality adjuster corrects the first RSRQ based on the measurement values to generate a second RSRQ of the evolved node B.Type: GrantFiled: February 4, 2013Date of Patent: August 11, 2015Assignee: Industrial Technology Research InstituteInventors: Chia-Lung Liu, Chun-Hao Tseng, Ming-Chia Lee
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Publication number: 20150195736Abstract: A base station and a resource allocation method are provided. The method includes: calculating transmission rates of user equipment (UE) on unallocated resource blocks; finding consecutive resource block (RB) sets within the unallocated resource blocks according to a predetermined window size; finding minimum transmission rates of the UE among the transmission rates respectively corresponding to the consecutive RB sets; finding a largest value and a second largest value corresponding to each of the consecutive RB sets among the minimum transmission rates corresponding to the UE; calculating absolute difference values between the largest value and the second largest value corresponding to each of the consecutive RB sets; finding a maximum absolute difference value from the absolute difference values corresponding to the consecutive RB sets; and allocating the consecutive RB set corresponding to the maximum absolute difference value to the specific UE.Type: ApplicationFiled: March 20, 2014Publication date: July 9, 2015Applicant: Industrial Technology Research InstituteInventors: Chia-Lung Liu, Hsi-Lu Chao, Lung-Han Hsu, Chia-Kai Chang
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Publication number: 20150172974Abstract: A home base station and method for supporting a plurality of cells under carrier aggregation. The home base station includes a preamble generator and a preamble monitor. The preamble generator allocates respective random access resources in the cells for handover to be carried out by a user equipment (UE), and upon receiving a handover request signal transmitted by a Mobility Management Entity (MME), generates a specific preamble and its transmission time, so that the UE performs random access on the cells based on the preamble and the transmission time to obtain the random access resources and sends out a Random Access Preamble (RAP). The preamble monitor enables the cells to simultaneously monitor the RAP sent by the UE, and when one of the cells receiving the RAP, identifies the cell on which the UE camps based on which one of the cells that has the RAP.Type: ApplicationFiled: May 27, 2014Publication date: June 18, 2015Applicant: Industrial Technology Research InstituteInventors: Chia-Lung Liu, Kuei-Li Huang, Ching-Hsu Chang
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Publication number: 20140135009Abstract: A method and an apparatus for correcting wireless signal quality are provided. The apparatus includes an abnormality detector and a quality adjuster. The abnormality detector collects multiple measurement values reported by a user equipment (UE), calculates a variation degree value according to the measurement values, and compares the variation degree value with a predetermined threshold value. The measurement values are generated by the UE when the UE measures the wireless signal quality of an evolved node B. The measurement values include a first reference signal receiving quality (RSRQ) of the evolved node B. When the variation degree value is larger than the predetermined threshold value, the quality adjuster corrects the first RSRQ based on the measurement values to generate a second RSRQ of the evolved node B.Type: ApplicationFiled: February 4, 2013Publication date: May 15, 2014Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Chia-Lung Liu, Chun-Hao Tseng, Ming-Chia Lee
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Patent number: 8498231Abstract: A method for an access service network gateway (ASN-GW) to provide multicast and broadcast services (MBSs) through a plurality of base stations (BSs) in an MBS zone. The method includes: generating a plurality of synchronization maps (SYNC MAPs) including synchronization information for the BSs to generate MBS data frames; and transmitting to the BSs the generated SYNC MAPs, one in each of a plurality of schedule intervals.Type: GrantFiled: April 16, 2009Date of Patent: July 30, 2013Assignee: Industrial Technology Research InstituteInventors: You-Lin Chen, Jen-Shun Yang, Wei-Han Kuo, Chia-Lung Liu
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Patent number: 8391198Abstract: A reliable synchronization apparatus and method within a multicast and broadcast service (MBS) zone having m sync executers (SEs) belonging to n retransmission zones is provided. Each retransmission zone has a selected leader SE and other member SEs. The apparatus comprises a sync controller and the n selected leader SEs. When the Sync controller multicasts a sync ruler to all SEs in a retransmission zone, the leader SE that loses the Sync ruler sends a NACK message to request the sync controller to retransmit the sync ruler. An election is triggered for updating leader information and announcing election to all SEs. The member SE that loses the sync ruler sends a NACK message to request its leader or the Sync controller to retransmit the sync ruler.Type: GrantFiled: March 5, 2010Date of Patent: March 5, 2013Assignee: Industrial Technology Research InstituteInventors: Wei-Han Kuo, Chia-Lung Liu, Jui-Tang Wang, Jen-Shun Yang
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Patent number: 8000281Abstract: A method for allocating a multicast connection identifier (MCID) to a new multicast/broadcast service (MBS) provided in a wireless network including a plurality of base stations. The method includes: calculating, for a new MBS zone and existing MBS zones, coverage area ratios each based on information regarding the new MBS zone and one of the existing MBS zones, the new MBS zone including a first group of base stations, the one of the existing MBS zones including a second group of base stations; and allocating an MCID to the new MBS based the coverage area ratios; wherein the first group of base stations include ones of the plurality of base stations to transmit data relating to the new MBS, and the second group of base stations include ones of the plurality of base stations to transmit data relating to at least one existing MBS.Type: GrantFiled: July 31, 2008Date of Patent: August 16, 2011Assignee: Industrial Technology Research InstituteInventors: Jen-Shun Yang, Chia-Lung Liu
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Publication number: 20110116434Abstract: A reliable synchronization apparatus and method within a multicast and broadcast service (MBS) zone having m sync executers (SEs) belonging to n retransmission zones is provided. Each retransmission zone has a selected leader SE and other member SEs. The apparatus comprises a sync controller and the n selected leader SEs. When the Sync controller multicasts a sync ruler to all SEs in a retransmission zone, the leader SE that loses the Sync ruler sends a NACK message to request the sync controller to retransmit the sync ruler. An election is triggered for updating leader information and announcing election to all SEs. The member SE that loses the sync ruler sends a NACK message to request its leader or the Sync controller to retransmit the sync ruler.Type: ApplicationFiled: March 5, 2010Publication date: May 19, 2011Inventors: Wei-Han Kuo, Chia-Lung Liu, Jui-Tang Wang, Jen-Shun Yang
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Publication number: 20100034129Abstract: A method for an access service network gateway (ASN-GW) to provide multicast and broadcast services (MBSs) through a plurality of base stations (BSs) in an MBS zone. The method includes: generating a plurality of synchronization maps (SYNC MAPs) including synchronization information for the BSs to generate MBS data frames; and transmitting to the BSs the generated SYNC MAPs, one in each of a plurality of schedule intervals.Type: ApplicationFiled: April 16, 2009Publication date: February 11, 2010Inventors: You-Lin CHEN, Jen-Shun Yang, Wei-Han Kuo, Chia-Lung Liu
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Publication number: 20090041045Abstract: A method for allocating a multicast connection identifier (MCID) to a new multicast/broadcast service (MBS) provided in a wireless network including a plurality of base stations. The method includes: calculating, for a new MBS zone and existing MBS zones, coverage area ratios each based on information regarding the new MBS zone and one of the existing MBS zones, the new MBS zone including a first group of base stations, the one of the existing MBS zones including a second group of base stations; and allocating an MCID to the new MBS based the coverage area ratios; wherein the first group of base stations include ones of the plurality of base stations to transmit data relating to the new MBS, and the second group of base stations include ones of the plurality of base stations to transmit data relating to at least one existing MBS.Type: ApplicationFiled: July 31, 2008Publication date: February 12, 2009Inventors: Jen-Shun YANG, Chia-Lung Liu