Patents by Inventor Hejia Luo

Hejia Luo 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: 20220264662
    Abstract: This application discloses a random access preamble configuration method applicable to a satellite network and a communication apparatus. In the method, a random access preamble location offset and duration of a PRACH occasion can be flexibly configured based on features of a satellite system. The method includes: A receiving apparatus receives first indication information, where the first indication information includes indication information used to identify the random access preamble location offset at the physical random access channel PRACH occasion. The receiving apparatus transmits a random preamble based on the first indication information, where the random preamble includes a sequence part and a guard time. Because a communication distance is relatively long and a transmission delay difference between users is relatively large in a satellite communication system, time domain resources occupied by the PRACH occasion can be minimized by using this method.
    Type: Application
    Filed: May 6, 2022
    Publication date: August 18, 2022
    Inventors: Chenlei XU, Jianwei ZHOU, Xiaolu WANG, Hejia LUO
  • Publication number: 20220263701
    Abstract: This application discloses a beam establishment method. A terminal apparatus obtains synchronization signal and PBCH blocks SSBs in a plurality of beams; then determines a target beam in the plurality of beams based on an association relationship between an SSB index and a first random access preamble, where the first random access preamble is determined based on a cyclic shift and/or an order of symbols; and finally sends the random access preamble by using the target beam, to initiate a random access request. A communication device receives the first random access preamble in the random access request sent by the terminal apparatus, and then determines, based on the association relationship, the target beam accessed by the terminal apparatus. According to embodiments of this application, the first random access preamble is determined based on the cyclic shift and/or the order of symbols.
    Type: Application
    Filed: May 6, 2022
    Publication date: August 18, 2022
    Inventors: Jianwei ZHOU, Chenlei XU, Hejia LUO, Xiaolu WANG
  • Publication number: 20220264636
    Abstract: This application provides a random access method and apparatus, and a device. The network device obtains a first random access preamble length of a first terminal device and a second random access preamble length of a second terminal device, where a value of delay compensation performed by the network device when receiving a first random access preamble is different from a value of delay compensation performed by the network device when receiving a second random access preamble. The network device determines a first random access parameter of the first terminal device and a second random access parameter of the second terminal device based on the first random access preamble length and the second random access preamble length, where there is an overlapping part, in time domain, between a random access preamble indicated by the first random access parameter and a random access preamble indicated by the second random access parameter.
    Type: Application
    Filed: May 3, 2022
    Publication date: August 18, 2022
    Inventors: Xiaolu WANG, Hejia LUO, Rong LI, Bin WANG, Jun WANG
  • Publication number: 20220263570
    Abstract: The disclosure provides satellite communication methods and related devices. One example method includes that a device receives a first common timing advance (TA) parameter and a first common TA change amount calculation parameter, where the first common TA parameter is used to obtain a first common TA, and the first common TA change amount calculation parameter is used to update the first common TA to obtain an updated common TA. The device sends a random access preamble by using the updated common TA.
    Type: Application
    Filed: May 5, 2022
    Publication date: August 18, 2022
    Inventors: Xiaolu WANG, Hejia LUO, Chenlei XU, Jianwei ZHOU, Xueliang SHI
  • Publication number: 20220264417
    Abstract: The present disclosure relates to network switching methods and apparatuses. in one example method, a beam that currently provides a service for a terminal device is a first beam. The first beam is generated by a first network device. The first network device obtains user information of the terminal device, and obtains switching information based on the user information. After the first network device sends the switching information to the terminal device, the terminal device can perform beam switching based on the switching information.
    Type: Application
    Filed: May 6, 2022
    Publication date: August 18, 2022
    Inventors: Jianwei ZHOU, Hejia LUO, Chenlei XU, Xiaolu WANG, Jun WANG
  • Publication number: 20220255620
    Abstract: This disclosure provides satellite communication methods and apparatuses. One example method includes that a terminal device determines a first time offset of a first random access response window based on a distance information between a satellite base station and the ground. Based on the first time offset and the first random access response window, the terminal device receives a random access response sent by the satellite base station.
    Type: Application
    Filed: April 26, 2022
    Publication date: August 11, 2022
    Inventors: Xiaolu Wang, Hejia Luo, Rong Li, Bin Wang, Jun Wang
  • Publication number: 20220224404
    Abstract: The disclosure provides satellite communication methods and related devices. One example method includes generating a random access preamble sequence which includes a cyclic prefix, a sequence part, and a guard interval. The sequence part includes a subsequence A and a subsequence B, or the sequence part includes a subsequence C, and the subsequence C is a time domain superimposed sequence of a subsequence A and a subsequence B. The subsequence A includes at least one preamble symbol, the subsequence B includes at least one preamble symbol, and the subsequence A and the subsequence B are respectively generated by using ZC sequences of different root indexes, a quantity of subsequences A is m, a quantity of subsequences B is m or m?1, and m is a positive integer. The method further includes outputting the random access preamble sequence.
    Type: Application
    Filed: March 29, 2022
    Publication date: July 14, 2022
    Inventors: Chenlei XU, Jianwei ZHOU, Hejia LUO, Xiaolu WANG
  • Publication number: 20220225261
    Abstract: This application discloses example signal sending methods and apparatuses, and example signal processing methods and apparatuses. One example method includes generating, by a terminal device, a channel sounding reference signal (SRS). The terminal device can then send the SRS to a target base station, where the target base station detects, by using the SRS, that a change range of an uplink timing location of the terminal device is not less than a length of one SRS symbol.
    Type: Application
    Filed: March 29, 2022
    Publication date: July 14, 2022
    Inventors: Chenlei XU, Jianwei ZHOU, Hejia LUO, Xiaolu WANG
  • Publication number: 20220224463
    Abstract: Example satellite communication methods and example related devices are provided. One example satellite communication method includes generating a random access preamble sequence, where the random access preamble sequence includes a cyclic prefix, a sequence part, and a guard interval, the sequence part is obtained by performing frequency domain resource mapping and time-frequency transformation on a frequency domain sequence, and the frequency domain sequence is obtained based on a Zadoff-Chu (ZC) sequence and a mask sequence. The random access preamble sequence can then be output.
    Type: Application
    Filed: March 29, 2022
    Publication date: July 14, 2022
    Inventors: Chenlei XU, Hejia LUO, Jianwei ZHOU, Xiaolu WANG
  • Publication number: 20220225432
    Abstract: One example method includes that a terminal device determines first random access information associated with a first synchronization broadcast block and associated with a beam parameter of a satellite beam, where the beam parameter is used to distinguish the satellite beam. The terminal sends a preamble to a satellite based on the first random access information. The satellite receives the preamble from the terminal, and determines the first random access information. The satellite determines the first SSB and the beam parameter of the satellite beam that are associated with the first random access information.
    Type: Application
    Filed: March 28, 2022
    Publication date: July 14, 2022
    Inventors: Xiaolu WANG, Hejia LUO, Jianwei ZHOU, Chenlei XU
  • Publication number: 20220225332
    Abstract: The disclosure provides transmission methods and apparatuses. One example includes sending control signaling to a terminal device, to indicate the terminal device to send a physical uplink shared channel (PUSCH) on a first frequency band; and receiving the PUSCH sent by the terminal device on the first frequency band. The first frequency band includes at least one guard subcarrier. A quantity of the at least one guard subcarrier is determined based on a Doppler frequency shift of a beam covering the terminal device. The first frequency band is located on a frequency band corresponding to the beam.
    Type: Application
    Filed: March 25, 2022
    Publication date: July 14, 2022
    Inventors: Jianwei ZHOU, Chenlei XU, Hejia LUO, Xiaolu WANG
  • Publication number: 20220224405
    Abstract: The present disclosure relates to beam handover methods, apparatuses, and communications devices. In one example method, a terminal device receives first indication information sent by a network device, where the first indication information includes a first parameter value of a first beam, and the first parameter value is a compensation amount of a frequency offset of the first beam generated by relative motion between the terminal device and the network device. The terminal device calculates a receive frequency or a transmit frequency of the first beam based on the first parameter value.
    Type: Application
    Filed: March 29, 2022
    Publication date: July 14, 2022
    Inventors: Jianwei ZHOU, Yunfei QIAO, Hejia LUO, Chenlei XU
  • Publication number: 20220225424
    Abstract: This disclosure provides data processing methods. One example including a network device obtains target information that includes a transmission delay difference corresponding to a target beam or a target cell; determines a first preamble format based on the transmission delay difference, and then determines first configuration information used to indicate the first preamble format and a first set of random access occasions included in a random access period, where an interval between random access times included in the first set of random access occasions is greater than or equal to a preamble length corresponding to the first preamble format; and generates a corresponding first configuration index based on the first configuration information. The preamble formats required for different beams or cells can be determined based on transmission delay differences corresponding to the different beams or cells, and then configuration information of a random access occasion is further determined.
    Type: Application
    Filed: March 29, 2022
    Publication date: July 14, 2022
    Inventors: Xiaolu WANG, Hejia LUO, Chenlei XU, Jianwei ZHOU, Rong LI
  • Publication number: 20220225259
    Abstract: The present disclosure relates to timing advance indication methods, communication apparatuses, and storage medium. In one example method, a first device determines a quantity of extended bits and a location of the extended bit of a timing advance (TA) instruction based on a subcarrier spacing of a second device. The first device sends the TA instruction to the second device, where the TA instruction includes the extended bit, and a quantity of bits of the TA instruction is greater than 12.
    Type: Application
    Filed: March 30, 2022
    Publication date: July 14, 2022
    Inventors: Xiaolu WANG, Hejia LUO, Rong LI, Bin WANG, Jun WANG
  • Publication number: 20220217033
    Abstract: Example signal transmission methods based on satellite communication and apparatus are described. One example method includes obtaining, by a communication device, carrier attribute information corresponding to a target carrier used to transmit an orthogonal frequency division multiplexing (OFDM) symbol. The carrier attribute information of the target carrier includes subcarrier spacing. The communications device determines a cyclic prefix (CP) length of the OFDM symbol based on the carrier attribute information of the target carrier and a preset correspondence between carrier attribute information and the OFDM symbol. The CP is used to carry first data. The first data is data in the OFDM symbol.
    Type: Application
    Filed: March 28, 2022
    Publication date: July 7, 2022
    Inventors: Jianwei ZHOU, Chenlei XU, Hejia LUO, Jun WANG
  • Publication number: 20220217589
    Abstract: The technology of this application relates to an information transmission method, an apparatus, and a system. The method includes user equipment receives first indication information sent by a first network device, where the first indication information includes a polarization method of a target cell, and the user equipment performs cell measurement on the target cell based on the polarization method of the target cell. According to the method, the user equipment can obtain the polarization method of the target cell before entering the target cell. In this way, when performing cell handover and reselection, the user equipment can enable, based on the polarization method of the target cell, only a port corresponding to the polarization method of the target cell, to receive a satellite signal, and perform cell measurement on the target cell, to complete cell handover and reselection procedures.
    Type: Application
    Filed: March 24, 2022
    Publication date: July 7, 2022
    Inventors: Yu WANG, Yunfei QIAO, Rong LI, Jianwei ZHOU, Hejia LUO
  • Publication number: 20220217029
    Abstract: Example communication methods and apparatus are described. One example method includes generating a first signal and sending a first signal, where the first signal includes an orthogonal frequency division multiplexing (OFDM) symbol, a first-type cyclic prefix (CP), and a second-type CP. CP resources of the first-type CP include two types of CP resources: a first CP resource and a second CP resource. CP resources of the second-type CP include one type of CP resource, that is, the second CP resource. The first CP resource may be used to carry data that is different from data carried on the OFDM symbol. The second CP resource may be used to carry data that is the same as the data carried on the OFDM symbol.
    Type: Application
    Filed: March 25, 2022
    Publication date: July 7, 2022
    Inventors: Xiaolu WANG, Rong LI, Hejia LUO, Bin WANG, Jun WANG
  • Publication number: 20220217600
    Abstract: This application provides a satellite communication method and an apparatus. The method includes: receiving, by a terminal device, first information sent by a satellite, where the first information is used to indicate a first timing change rate range; measuring and obtaining, by the terminal device, a first downlink timing change rate; determining a first uplink timing change rate based on the first downlink timing change rate and the first timing change rate range; and performing uplink communication with the satellite based on the first uplink timing change rate. The method can effectively resolve a problem of uplink timing drift and improve uplink performance.
    Type: Application
    Filed: March 25, 2022
    Publication date: July 7, 2022
    Inventors: Jianwei ZHOU, Hejia LUO, Chenlei XU, Xiaolu WANG
  • Publication number: 20220190910
    Abstract: This application relates to the field of communication technologies, and discloses a communication method and a communication apparatus, to resolve a problem of a poor interference suppression effect caused by closing an edge beam of a satellite. The method includes: A first satellite sends a first message to a second satellite. The first message includes information about a frequency reuse scheme. The information about the frequency reuse scheme includes basic unit information. The basic unit information includes central point locations and frequency information of at least N?1 beams. Herein, N is a frequency reuse factor of the first satellite. At least N?1 different pieces of frequency information exist in the frequency information that is of the at least N?1 beams and that is included in the basic unit information. In addition, N is a positive integer greater than or equal to 3.
    Type: Application
    Filed: March 2, 2022
    Publication date: June 16, 2022
    Inventors: Yu WANG, Yunfei QIAO, Hejia LUO, Xian MENG
  • Publication number: 20220167297
    Abstract: Example methods and apparatus for determining a timing advance are described. One example method includes obtaining ephemeris information of a satellite, where the ephemeris information includes coordinates of the satellite and an ephemeris error of the satellite. A timing advance is determined according to a preset rule based on the ephemeris information and location information of a terminal device, where the location information includes coordinates of the terminal device and a positioning error of the terminal device. The preset rule is determined by using a first horizontal distance, a first vertical distance, the ephemeris error, and the positioning error.
    Type: Application
    Filed: February 14, 2022
    Publication date: May 26, 2022
    Inventors: Xiaolu WANG, Hejia LUO, Chenlei XU, Rong LI, Jun WANG