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).
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Patent number: 11963182Abstract: A method in a wireless device is provided. The method includes: receiving a downlink signal, wherein the downlink signal includes a Physical Downlink Control Channel (PDCCH) and a Physical downlink Shared Channel (PDSCH), the PDCCH having first downlink Control Information (DCI) indicating at least second downlink control information (DCI) in the PDSCH; and performing one of encoding and decoding user data in the PDSCH based on the first DCI and second DCI. A wireless device implementing this method is provided as well.Type: GrantFiled: December 12, 2018Date of Patent: April 16, 2024Assignee: Telefonaktiebolaget LM Ericsson (Publ)Inventors: Jun Wang, Xixian Chen, Dongsheng Yu
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Patent number: 11943053Abstract: A method in a sending node of a communications network includes: encoding a transport block, TB, including data of at least one protocol data unit, PDU, to generate a code block group, CBG, comprising one or more code blocks; defining a CBG header indicative of a starting location of a first PDU within the CBG; and transmitting the CBG including the CBG header. A method in a receiving node includes: receiving one or more code block groups, CBGs, each CBG comprising a CBG header indicative of a start location of a first protocol data unit, PDU, within the CBG; attempting to decode each received CBG; responsive to failing to decode a first CBG, attempting to decode a second CBG, and responsive to successfully decoding the second CBG: identifying the start location of the first PDU in the second CBG; buffering data of the second CBG prior to the identified start location; and forwarding data of PDUs following the identified start location.Type: GrantFiled: February 19, 2019Date of Patent: March 26, 2024Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Xixian Chen, Qingchao Liu, Yashar Nezami
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Patent number: 11937138Abstract: A network node, wireless device, method and system are provided. In one or more embodiments, a network node (16) for servicing a plurality of wireless devices (22) using a plurality of carriers is provided. Each carrier of the plurality of carriers is configured with a respective plurality of beams. The network node (16) includes processing circuitry (68) configured to: determine a metric associated with Multiple User-Multiple Input Multiple Output, MU-MEMO, usage with respect to the plurality of carriers, and initiate at least one handover of at least one of the plurality of wireless devices (22) to a different carrier of the plurality of carriers based at least in part on the metric.Type: GrantFiled: November 12, 2018Date of Patent: March 19, 2024Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Xiaoming Lai, Weigang Li, Xixian Chen, Dongsheng Yu
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Patent number: 11920137Abstract: 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: GrantFiled: February 26, 2018Date of Patent: March 5, 2024Assignee: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Congqiang Zhang, Xixian Chen, Heng-Phon Too
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Publication number: 20230422241Abstract: According to some embodiments, a method performed by a network node for decoding a channel state information (CSI) report comprises generating a physical uplink shared channel (PUSCH) scrambling sequence, descrambling a PUSCH using the PUSCH scrambling sequence, decoding a CSI report part one to determine a rank indicator, and determining a location of a CSI report part two. The method further comprises extracting a scrambling sequence from the PUSCH scrambling sequence corresponding to the location of the CSI report part two, generating a CSI part two scrambling sequence based on the PUSCH scrambling sequence and the location of the CSI report part two, and applying the extracted scrambling sequence to the location of the CSI report part two. The method further comprises descrambling the location of the CSI report part two in the PUSCH using the CSI part two scrambling sequence and decoding the CSI part two.Type: ApplicationFiled: October 22, 2020Publication date: December 28, 2023Inventors: Qingchao Liu, Xixian Chen, Pierre Coll
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Patent number: 11811423Abstract: Apparatuses and methods are disclosed for a communication device associated with a wireless transmission. In one embodiment, a method includes performing one of a low-density parity check, LDPC, decoding process and an LDPC encoding process by loading a set of bits, in parallel, into a plurality of registers, the set of bits being distributed among the plurality of registers; one of de-interleaving and interleaving the loaded set of bits within the plurality of registers by rearranging the loaded set of bits into one of a de-interleaved and an interleaved set of bits; and after the set of bits is rearranged into the one of the de-interleaved and the interleaved set of bits within the plurality of registers, writing the one of the de-interleaved and the interleaved set of bits, in parallel, from the plurality of registers to memory.Type: GrantFiled: February 22, 2022Date of Patent: November 7, 2023Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Qingchao Liu, Xixian Chen, Yashar Nezami
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Patent number: 11680256Abstract: A bacterial strain comprising one or more vectors encoding a) one or more enzymes to produce one or more terpene precursors; and b) a fungal terpene synthase (FTPS). The present invention also relates to a method of producing a terpenoid comprising a) culturing the bacterial strain described herein in an expression medium; and b) isolating the terpenoid from said expression medium.Type: GrantFiled: September 2, 2019Date of Patent: June 20, 2023Assignees: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH, JUSTUS-LIEBIG-UNIVERSITAET GIESSENInventors: Congqiang Zhang, Xixian Chen, Ruehl Martin, Heng-Phon Too
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Patent number: 11528088Abstract: 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: GrantFiled: February 6, 2018Date of Patent: December 13, 2022Assignee: Telefonaktiebolaget LM Ericsson (PUBL)Inventors: Xixian Chen, Jun Wang, James Jianfeng Weng
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Patent number: 11469779Abstract: According to some embodiments, a method for polar encoding includes obtaining an input bits index array Q, wherein each element Q[i] is an index of a polar coded transmission channel and corresponds to an input U[i] of a polar encoder. The elements of Q are ordered according to their associated channel quality. The method further includes obtaining an integer number X of bits for polar encoding and wireless transmission, wherein X is not greater than N. Upon determining the polar code block length N is not greater than the number of rate matched bits M available for transmission, the method includes assigning each of the bits as inputs to the polar encoder ordered according to the input bits index array Q.Type: GrantFiled: September 7, 2018Date of Patent: October 11, 2022Assignee: Telefonaktiebolaget LM Ericsson (Publ)Inventors: Xixian Chen, Qingchao Liu, Yashar Nezami
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Publication number: 20220322366Abstract: According to certain embodiments, a method for use in a network node for scheduling wireless transmissions using a plurality of multi-user multiple-input multiple-output (MU-MIMO) transmission layers comprises determining a first wireless device is spatially pairable with a second wireless device and that a scheduling priority of the first device is higher than the second device. The method further comprises allocating frequency domain resources of a first transmission layer for the first device according to its scheduling priority and allocating frequency domain resources in a second transmission layer for the second device according to the priority of the first device. The amount of frequency domain resources allocated in the second transmission layer is no larger than that allocated in the first transmission layer. The method further comprises transmitting the data to first wireless device on first transmission layer and to second wireless device on the second transmission layer.Type: ApplicationFiled: August 9, 2019Publication date: October 6, 2022Inventors: Dongsheng Yu, Xixian Chen, Xiaoming Lai, Weigang LI
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Patent number: 11463191Abstract: According to some embodiments, a method for use in a wireless transmitter of a wireless communication network comprises (1) calculating information carrying bits per resource block group (RBG) or physical resource block (PRB) based on a channel condition (e.g., signal to interference plus noise ratio (SINR)); (2) estimating the required information bits and number of RBGs based on the desired number of bits to be transmitted and the number of available RBGs; (3) determining the MCS and TBS based on the estimated information bits, the required number of RBGs, number of layers, and RBG size; (4) adjusting the MCS and TBS based on the MCS index and TBS calculated at step 3, the number of required RBGs, and the accumulated information bits calculated from step 2; and (5) determining an MCS state based on the TBS and the accumulated information bits.Type: GrantFiled: October 2, 2018Date of Patent: October 4, 2022Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Xixian Chen, Qingchao Liu, Yashar Nezami
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Publication number: 20220312432Abstract: According to certain embodiments, a method for use in a network node for scheduling wireless transmissions comprises determining a channel quality weight for a first wireless channel based on its number of information bits and a channel quality weight for a second wireless channel based on its number of information bits. The number of information bits is based on a signal to interference plus noise (SINR) measurement and a modulation coding scheme of the wireless channels. The method further comprises determining a scheduling weight for the first wireless device based on the channel quality weight for the first wireless channel, determining a scheduling weight for the second wireless device based on the channel quality weight for the second wireless channel, and scheduling a transmission to one of the first and second wireless devices based on the scheduling weights of the first and second wireless devices.Type: ApplicationFiled: July 2, 2019Publication date: September 29, 2022Inventors: Xixian Chen, Dongsheng YU, Xiaoming Lai, Weigang Li
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Patent number: 11457453Abstract: 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: GrantFiled: June 7, 2016Date of Patent: September 27, 2022Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Xixian Chen, Chandra Sekhar Bontu, Jianguo Long, James Jianfeng Weng
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Publication number: 20220263522Abstract: Apparatuses and methods are disclosed for a communication device associated with a wireless transmission. In one embodiment, a method includes performing one of a low-density parity check, LDPC, decoding process and an LDPC encoding process by loading a set of bits, in parallel, into a plurality of registers, the set of bits being distributed among the plurality of registers; one of de-interleaving and interleaving the loaded set of bits within the plurality of registers by rearranging the loaded set of bits into one of a de-interleaved and an interleaved set of bits; and after the set of bits is rearranged into the one of the de-interleaved and the interleaved set of bits within the plurality of registers, writing the one of the de-interleaved and the interleaved set of bits, in parallel, from the plurality of registers to memory.Type: ApplicationFiled: February 22, 2022Publication date: August 18, 2022Inventors: Qingchao LIU, Xixian CHEN, Yashar NEZAMI
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Patent number: 11419005Abstract: 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: GrantFiled: June 6, 2018Date of Patent: August 16, 2022Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Xixian Chen, Jun Wang, James Jianfeng Weng
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Patent number: 11394450Abstract: Methods and systems for Long Term Evolution (LTE) and Fifth Generation (5G) beam index filtering are presented. According to one aspect, a method for beam index filtering comprises receiving a beam index that was estimated based on information received from a User Equipment (UE); storing the received beam index into a queue of length N for storing received beam indexes, N being greater than one; selecting a beam index from the queue according to a filtering algorithm; and using the selected beam index for transmissions to the UE. In one embodiment, a majority vote algorithm is employed to select the beam index that appears most often in the queue. Where there is a tie between two or more beam indexes, the beam index that was most recently added to the queue is selected. The same concepts may be applied to filter input data or parameters other than beam indexes.Type: GrantFiled: September 10, 2018Date of Patent: July 19, 2022Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Qingchao Liu, Xixian Chen, Edward Mah, Yashar Nezami
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Publication number: 20220225269Abstract: Methods and apparatuses are provided for network testing. In one embodiment, a method in an unmanned vehicle includes controlling a movement of the unmanned vehicle carrying the UE according to a testing location algorithm, the testing location algorithm comprising moving the unmanned vehicle carrying the UE to at least one candidate testing location, determining at least one measurement value at the at least one candidate testing location and determining a reference location based at least in part on the determined at least one measurement value. In another embodiment, a method in a network node initiating a launch of at least one unmanned vehicle of a plurality the unmanned vehicle carrying the UE to at least one candidate testing of unmanned vehicles, each of the at least one unmanned vehicle moving one of the plurality of UEs to a reference location, each reference location corresponding to a testing location.Type: ApplicationFiled: June 21, 2019Publication date: July 14, 2022Inventors: Xiaoming LAI, Weigang LI, Xixian CHEN, Dongsheng YU
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Patent number: 11332765Abstract: 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: GrantFiled: July 17, 2020Date of Patent: May 17, 2022Assignee: AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHInventors: Congqiang Zhang, Xixian Chen, Sudha Shukal
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Patent number: 11329671Abstract: 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: GrantFiled: April 27, 2018Date of Patent: May 10, 2022Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Qingchao Liu, Xixian Chen, Yashar Nezami
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Patent number: 11290130Abstract: Apparatuses and methods are disclosed for a communication device associated with a wireless transmission. In one embodiment, a method includes performing one of a low-density parity check, LDPC, decoding process and an LDPC encoding process by loading a set of bits, in parallel, into a plurality of registers, the set of bits being distributed among the plurality of registers; one of de-interleaving and interleaving the loaded set of bits within the plurality of registers by rearranging the loaded set of bits into one of a de-interleaved and an interleaved set of bits; and after the set of bits is rearranged into the one of the de-interleaved and the interleaved set of bits within the plurality of registers, writing the one of the de-interleaved and the interleaved set of bits, in parallel, from the plurality of registers to memory.Type: GrantFiled: November 7, 2018Date of Patent: March 29, 2022Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Qingchao Liu, Xixian Chen, Yashar Nezami