Patents by Inventor Xixian Chen

Xixian Chen 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).

  • Publication number: 20210084532
    Abstract: There is provided a method performed by a wireless device for handling user data, wherein the user data are converted into codewords, each codeword having a first group of layers and a second group of layers. The method comprises: receiving an index from a network node, the index indicating a Transport Block Size (TBS) index, a Redundant Version (RV) and a differential modulation; determining a TBS based on the received index; determining a redundant version value based on the received index; determining a first modulation order for the first group and a second modulation order for the second group of a codeword, based on the differential modulation; and performing one of decoding and encoding the codeword based at least on the determined first and second modulation orders, the determined TBS and the determined redundant version value.
    Type: Application
    Filed: June 6, 2018
    Publication date: March 18, 2021
    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Xixian CHEN, Jun WANG, James Jianfeng WENG
  • Publication number: 20210050935
    Abstract: Systems and methods for enhanced link adaptation are provided. In some embodiments, a method of operation of a network node includes calculating an actual RE efficiency based at least in part on an actual TBS obtained from a specification. The TBS may be obtained from a specification based on LA result and actual buffer data volume. The method also includes determining a real BLER from a searchable repository, based on the actual RE efficiency and an actual BLER. The method may further include calculating an actual outer-loop adjustment (OLA) step based on the actual BLER. The method may further include a dynamic outer-loop up/down step adjustment based on the actual OLA step.
    Type: Application
    Filed: February 6, 2018
    Publication date: February 18, 2021
    Inventors: Xixian CHEN, Jun WANG WANG, James Jianfeng WENG
  • Publication number: 20210040520
    Abstract: A method of increasing terpenoid production in a host cell that produces one or more terpenoids, comprising: a) providing a host cell that produces one or more terpenoids, said host cell comprising a vector comprising a polynucleotide sequence encoding a terpene synthase enzyme; b) modifying the vector to: i. introduce an inducible promoter operably linked to the polynucleotide sequence encoding the terpene synthase enzyme; and ii. introduce a polynucleotide sequence encoding a ribosomal binding site (RBS) that increases translation initiation rate of the terpenoid compared to a wild type ribosomal binding site; c) determining the dosage of an inducer capable of inducing the inducible promoter; d) culturing the host cell in a culture medium in the presence of the inducer at the dosage determined from step c); and e) isolating the terpenoid from the culture medium.
    Type: Application
    Filed: July 17, 2020
    Publication date: February 11, 2021
    Inventors: Congqiang Zhang, Xixian Chen, Sudha Shukal
  • Publication number: 20210044307
    Abstract: A method for use in a wireless transmitter of interleaving coded bits includes: determining an integer number (M) of polar coded bits {e(0), . . . , e(M?1)} for wireless transmission; determining a smallest integer number (T) such that T(T+1)/2>=M; and determining a one-dimensional interleaving index array, interleavingId( ), that represents the column by column non-zero elements of a two-dimensional matrix. The two-dimensional matrix includes a hypothetical T by T matrix containing the polar coded bits {e(0), . . . , e(M?1)} input row by row without using the lower right corner elements of the T×T matrix. The method further includes: interleaving the polar coded bits {e(0), . . . , e(M?1)} using the one-dimensional interleaving index array resulting in the output sequence {f(0), . . . , f(M?1)} wherein f(i)=e(interleavingId(i)); and transmitting the interleaved polar coded bits to a wireless receiver.
    Type: Application
    Filed: April 27, 2018
    Publication date: February 11, 2021
    Inventors: Qingchao LIU, Xixian CHEN, Yashar NEZAMI
  • Publication number: 20210036799
    Abstract: According to one aspect of the disclosure, a network node for adjusting a maximum channel code rate limit of a wireless device is provided. The network node includes processing circuitry. The processing circuitry includes a processor and a memory. The memory contains instructions that, when executed by the processor, configure the processor to: cause transmission, to the wireless device, of at least one data transmission coded at a maximum channel code rate that is one of less than and equal to a maximum channel code rate limit, receive at least one indication of reception of the at least one data transmission coded at the maximum channel code rate by the wireless device, and in response to receiving the at least one indication of reception associated with the at least one data transmission coded at the maximum channel code rate, modify the maximum channel code rate limit.
    Type: Application
    Filed: April 29, 2016
    Publication date: February 4, 2021
    Inventors: James Jianfeng WENG, Xixian CHEN, Hua XU
  • Patent number: 10911188
    Abstract: Systems and methods related to optimized selection, or determination of, Hybrid Automatic Repeat Request (HARQ) feedback modes for downlink transmissions by considering Time Division Duplexing (TDD) uplink/downlink (UL/DL) configuration, transmission mode, cell load, and/or traffic type are disclosed. In this manner, performance can be improved.
    Type: Grant
    Filed: February 15, 2017
    Date of Patent: February 2, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Xixian Chen, Akram Bin Sediq, Mercy George, Patrick Lie Chin Cheong, Jianguo Long, Yongquan Qiang
  • Publication number: 20200274635
    Abstract: A method performed by a wireless transmitter determining a transport block size (TBS) is provided. The method includes determining a TBS using a general function of a number of physical resource blocks (PRBs) to be granted (N_PRB), a number of resource elements (REs) per PRB (N_RE{circumflex over (?)}(DL,PRB)), a number of layers per transport block (?), a number of bits per modulation (Q_m), and a coding rate determined by a modulation coding scheme (MCS) (R), allocating a transport block of the determined TBS and transmitting the transport block to a wireless receiver. Apparatuses for implementing the method are also provide.
    Type: Application
    Filed: October 15, 2018
    Publication date: August 27, 2020
    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Xixian CHEN, Jianguo LONG, Yongquan QIANG, Hong REN
  • Patent number: 10667278
    Abstract: Various embodiments provide for the management of wireless resources, which can reduce call blocking by allowing high priority services, under suitable conditions, to use resources allocated to low priority services. Thus high priority services can pre-empt the usage of wireless resources by low priority services. This has the advantage of reducing call blocking for high priority calls, while permitting low priority calls to have more access to radio resources than conventional systems with the same call blocking rate. Thus a base station can implement a preemption mechanism that would reclaim Walsh Code and Forward Power resources from an active Supplemental Channel (SCH) burst in order to accommodate incoming Fundamental Channel (FCH) requests.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: May 26, 2020
    Assignee: Microsoft Technolgy Licensing, LLC
    Inventors: Xixian Chen, Xiao-Dong Li, James Weisert, Qiang Yuan, Miroslav Budic
  • Publication number: 20200153538
    Abstract: There is provided a method performed by a wireless device for handling user data. The method comprises: receiving an index (such as a Transport Block Size (TBS) index) from a network node; determining a TBS based on the received index; determining a modulation order based at least on the determined TBS; and performing one of decoding and encoding the user data based at least on the determined modulation order.
    Type: Application
    Filed: June 13, 2018
    Publication date: May 14, 2020
    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Xixian CHEN, Jung-Fu CHENG, James Jianfeng WENG, Jun Wang
  • Patent number: 10555234
    Abstract: Methods and apparatus are disclosed for handing over of a high-speed mobile terminal or user equipment from a source network node to a target network node. Reliable methods for measuring the speed of a moving user equipment are disclosed. Parameters used in a handover procedure are also adjusted in accordance with the speed of the user equipment. For handing over a high-speed user equipment, the present application discloses that the source network node can coordinate with the target network node and other candidate network nodes in transmitting a handover command to prevent handover failures.
    Type: Grant
    Filed: October 14, 2016
    Date of Patent: February 4, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Xiaoming Lai, Xixian Chen, Weigang Li
  • Publication number: 20190367928
    Abstract: A method for producing a carotenoid or apocarotenoid is disclosed. The method comprises the step of expressing in a host cell an expression module comprising an expression vector having a coding region encoding at least one optimised carotenoid or apocarotenoid generating enzyme, the coding region being operably linked to a promoter. A host cell comprising an expression vector having a coding region encoding at least one optimised carotenoid or apocarotenoid generating enzyme, the coding region being operably linked to a promoter is also provided together with a kit.
    Type: Application
    Filed: February 26, 2018
    Publication date: December 5, 2019
    Inventors: Congqiang Zhang, Xixian Chen, Heng-Phon Too
  • Publication number: 20190319751
    Abstract: Systems and methods related to optimized selection, or determination of, Hybrid Automatic Repeat Request (HARQ) feedback modes for downlink transmissions by considering Time Division Duplexing (TDD) uplink/downlink (UL/DL) configuration, transmission mode, cell load, and/or traffic type are disclosed. In this manner, performance can be improved.
    Type: Application
    Filed: February 15, 2017
    Publication date: October 17, 2019
    Inventors: Xixian CHEN, Akram BIN SEDIQ, Mercy GEORGE, Patrick LIE CHIN CHEONG, Jianguo LONG, Yongquan QIANG
  • Patent number: 10447455
    Abstract: A method for using a high order modulation (HoM) mode for communications with a wireless device in a wireless communication network is provided. The method includes receiving downlink channel quality indicator (CQI) information from an uplink transmission of the wireless device and determining a downlink channel quality estimate from the CQI information. When a measurement of the downlink channel quality estimate satisfies the predetermined criteria for a first predetermined number of consecutive uplink transmissions from the wireless device, a downlink transmission mode of the wireless device is switched from a first modulation mode to the HoM mode.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: October 15, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Chandra Sekhar Bontu, Xixian Chen, Kevin Luo, Hong Ren, Hua Xu
  • Publication number: 20190297630
    Abstract: A method and system for performing link adaptation are disclosed. According to one aspect, a method in a wireless communication system for performing link adaptation is provided. The method includes, when a first measure of channel quality is higher than a first predetermined amount, using a first outer loop adjustment process directed to determining link adaptation for a first data transmission transmitted to a wireless device. The method also includes, when the first measure of channel quality is lower than a second predetermined amount, using a second outer loop adjustment process different from the first outer loop adjustment process directed to determining link adaptation for a second data transmission transmitted to the wireless device.
    Type: Application
    Filed: June 7, 2016
    Publication date: September 26, 2019
    Inventors: Xixian CHEN, Chandra Sekhar BONTU, Jianguo LONG, James Jianfeng WENG
  • Publication number: 20190274066
    Abstract: A method and base station for distributing wireless device traffic load in a wireless communication system having a plurality of base stations are provided. A method includes determining a wireless device traffic load on a serving base station of the plurality of base stations. The method also includes determining a priority for each of a plurality of target base stations of the plurality of base stations, the priority being based at least in part on a number of wireless devices being served by the serving base station that receive a signal from a corresponding target base station that exceeds a threshold. The method further includes determining whether to change the load of the serving base station and sending a load change request to a target base station having a highest priority based on a comparison of the load on the serving base station to a load change threshold.
    Type: Application
    Filed: July 25, 2016
    Publication date: September 5, 2019
    Inventors: Xiaoming LAI, Xixian CHEN, Weigang LI
  • Patent number: 10171146
    Abstract: Systems and methods for Multiple-Input and Multiple-Output (MIMO) rank reduction to improve downlink throughput are disclosed. A method of operation of a radio access node includes determining that an imbalance between parallel channels of a spatial multiplexing downlink transmission to a wireless device is greater than an imbalance threshold and/or that a Negative Acknowledgement (NACK) rate over time for the parallel channels of a spatial multiplexing downlink transmission reported by the wireless device is greater than a NACK rate threshold. The method also includes, in response to determining that the imbalance between the parallel channels is greater than the imbalance threshold and/or that the NACK rate is greater than the NACK rate threshold, performing a fast rank reduction for a next downlink transmission whereby a rank is reduced from a rank indicator reported by the wireless device to some lower rank. Reducing the rank may improve downlink throughput.
    Type: Grant
    Filed: February 16, 2015
    Date of Patent: January 1, 2019
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: James Jianfeng Weng, Hua Xu, Xixian Chen, Jianguo Long, Guoqiang Lu, Michael Roger, Ying Shao, Michel Chauvin
  • Patent number: 10021704
    Abstract: According to certain embodiments, methods and systems for toggling transmission parameters in a heterogeneous network to achieve a target block error rate by a network node may include obtaining a signal-to-noise ratio (SINR) estimate from channel quality information for a downlink between a network node and a wireless device. For each of a first code word and a second code word to be transmitted on the downlink, a block error rate estimate may be obtained based on the SINR estimate. The network node may then determine at least one expected SINR for the first code word and the second code word. The at least one expected SINR may be determined as a function of the SINR estimate and the block error rate estimate. Based on the at least one expected SINR for the first code word and the second code word, a modulation and coding scheme (MCS) for obtaining a target block error rate may be selected.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: July 10, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Chandra Sekhar Bontu, Jianguo Long, Xixian Chen
  • Patent number: 10015218
    Abstract: According to certain embodiments, methods and systems for providing broadcast multicast service include transmitting, by a network node, a first transmission of multicast content data to wireless devices at a first quality of service level and a second transmission of multicast content data to the wireless devices at a second quality of service level. The second quality of service level may be of a higher quality of service than the first quality of service. Feedback may be received from at least one wireless device in the broadcast service area. In response to the feedback from the wireless devices, one or more transmission parameters associated with a subsequent transmission of the multicast content data may be adjusted.
    Type: Grant
    Filed: October 20, 2014
    Date of Patent: July 3, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Xixian Chen, Xiaoming Lai, Weigang Li
  • Patent number: 10003433
    Abstract: Systems and methods for control signal outer-loop adjustment are disclosed. In some embodiments, a method of operation of a network node in a cellular communications network is provided. The method includes transmitting a control signal and a data signal to a wireless device. The method also includes detecting an ambiguous state of reception of the control signal by the wireless device based on a feedback of reception of the data signal. The method also includes, in response to detecting the ambiguous state of reception, updating a link adaptation (LA) parameter used to choose a coding scheme and power level for transmission of information in the control signal. By updating the LA parameter in response to detecting the ambiguous state of reception, the network node may provide improved performance.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: June 19, 2018
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Xixian Chen, James Jianfeng Weng, Ahmed Nouah, Ying Shao
  • Publication number: 20180123748
    Abstract: A method for using a high order modulation (HoM) mode for communications with a wireless device in a wireless communication network is provided. The method includes receiving downlink channel quality indicator (CQI) information from an uplink transmission of the wireless device and determining a downlink channel quality estimate from the CQI information. When a measurement of the downlink channel quality estimate satisfies the predetermined criteria for a first predetermined number of consecutive uplink transmissions from the wireless device, a downlink transmission mode of the wireless device is switched from a first modulation mode to the HoM mode.
    Type: Application
    Filed: December 19, 2017
    Publication date: May 3, 2018
    Inventors: Chandra Sekhar BONTU, Xixian CHEN, Kevin LUO, Hong REN, Hua XU