Patents by Inventor Aijun Cao

Aijun Cao 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).

  • Patent number: 10499258
    Abstract: In a heterogeneous network deployment that includes a macro base station and one or more low power nodes, a geometry indicator signal is transmitted to facilitate the determination of geometry or location at a user equipment. The geometry indicator, in general, is transmitted on the same or different frequency as the data signal transmission and is transmitted over a range that is same or different from that of the data signal transmission. The geometry indicator signal may be transmitted by the macro base station, the low power nodes or both.
    Type: Grant
    Filed: May 7, 2014
    Date of Patent: December 3, 2019
    Assignee: ZTE Wistron Telecom AB
    Inventors: Aijun Cao, Thorsten Schier, Jan Johansson, Yonghong Gao, Patrick Svedman, Bojidar Hadjiski
  • Patent number: 10397856
    Abstract: Provided is a method and wireless communication system that includes a HetNet, a serving cell with an associated coverage area and multiple additional low power nodes (LPNs) deployed in one or more clusters of cells in the coverage area. The LPNs transmit an associated discovery signal based on the timing of the associated small cell. The serving cell is configured to determine the timing of the cells and therefore the transmission pattern of the discovery signals and the serving cell configures measurement gaps such that the discovery signals are transmitted during the measurement gaps. The network is adapted to accomplish this for various degrees of granularity and timing measurement inaccuracies by placing the measurement gaps and/or adjusting the discovery signal (DS) transmission scheme accordingly.
    Type: Grant
    Filed: March 16, 2015
    Date of Patent: August 27, 2019
    Assignee: ZTE (TX) Inc.
    Inventors: Thorsten Schier, Patrick Svedman, Aijun Cao, Jan Johansson, Yonghong Gao, Bojidar Hadjiski
  • Patent number: 10314043
    Abstract: A mobile terminal, method and non-transitory computer-readable medium for simultaneously utilizing at least two different radio access technologies (RATs). In one embodiment, the mobile terminal includes: at least one processor configured to control and coordinate first and second radio resource control functions corresponding to first and second RATs, respectively; and map a logical channel to first and second transport channels corresponding to the first and second RATs.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: June 4, 2019
    Assignee: ZTE WISTRON TELECOM AB
    Inventors: Aijun Cao, Yonghong Gao, Jan Johansson, Patrick Svedman, Thorsten Schier, Bojidar Hadjiski
  • Patent number: 10206216
    Abstract: A network node, method and non-transitory computer-readable medium for simultaneously utilizing at least two different radio access technologies (RATs). In one embodiment, the network node includes at least one processor configured to: activate a first radio resource control (RRC) component corresponding to a first RAT, wherein the first RAT is a default RAT of a mobile terminal configured to communicate with the network node; determine whether a second RAT is available to the mobile terminal based on at least one predetermined criterion; and if the second RAT is available, activate a second RRC component corresponding to the second RAT, wherein both the first RAT and the second RAT are active at the same time to communicate with the mobile terminal.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: February 12, 2019
    Assignee: ZTE Wistron Telecom AB
    Inventors: Aijun Cao, Yonghong Gao, Jan Johansson, Patrick Svedman, Thorsten Schier, Bojidar Hadjiski
  • Publication number: 20190028251
    Abstract: Provided are a pilot signal transmission method and apparatus, and a transmitting terminal. The method includes: setting a first pilot signal, a second pilot signal, and a third pilot signal on a same subcarrier; and transmitting the first pilot signal, the second pilot signal, and the third pilot signal respectively on three continuous symbols on the same subcarrier. The first pilot signal, the second pilot signal, and the third pilot signal are all nonzero data, a phase difference between the first pilot signal and the second pilot signal is 90 degrees, a phase difference between the third pilot signal and the second pilot signal is 90 degrees, and a phase difference between the first pilot signal and the third pilot signal is 180 degrees.
    Type: Application
    Filed: September 13, 2016
    Publication date: January 24, 2019
    Inventors: Yu XIN, Guanghui YU, Aijun CAO, Sohail TAHERI, Mir GHORAISHI, Pei XIAO
  • Publication number: 20190028314
    Abstract: A method of performing fast orthogonal frequency division multiplexing (FOFDM) includes: receiving a symbol transmitted in a multi-carrier communication system, wherein the symbol represents at least part of a transmitted signal, wherein the symbol is modulated based on a discrete cosine transform (DCT) technique; and estimating the symbol by using a widely linear (WL) estimation technique to minimize a difference between the received symbol and the estimated symbol.
    Type: Application
    Filed: January 5, 2017
    Publication date: January 24, 2019
    Inventors: Aijun CAO, Adnan ZAFAR, Chang HE, Pei XIAO, Muhammad IMRAN, Yonghong GAO, Jan JOHANSSON
  • Publication number: 20180359653
    Abstract: A method includes: receiving one or more synchronization signals; deriving a synchronization reference from the one or more synchronization signals; receiving a plurality of reference signals; based on the derived synchronization reference, performing a plurality of measurements on the plurality of reference signals; based on the plurality of measurements, selecting a plurality of random access resources; and selecting a random access resource from the plurality of random access resources for transmitting a random access signal to at least one of the one or more TP's.
    Type: Application
    Filed: July 15, 2016
    Publication date: December 13, 2018
    Inventors: Patrick SVEDMAN, Jan JOHANSSON, Yonghong GAO, Aijun CAO, Thorsten SCHIER, Bojidar HADJISKI
  • Publication number: 20180351776
    Abstract: A method and system for demodulating high-order Quadrature Amplitude Modulation (QAM) signals is disclosed. In one embodiment, the system includes a cyclic prefix (CP) removal unit for removing a CP from a received signal to provide a first intermediate signal, wherein the first intermediate signal comprises a plurality of bits; a fast Fourier transform (FFT) unit configured to convert the first intermediate signal into a frequency domain; a soft de-mapper configured to derive a plurality of soft bits based on log-likelihood estimates of the plurality of bits, wherein the soft de-mapper derives each soft bit by using a single linear function to approximate each soft bit; and a decoder configured to decode a signal derived from the soft de-mapper into information.
    Type: Application
    Filed: December 1, 2016
    Publication date: December 6, 2018
    Inventors: Aijun CAO, Juquan MAO, Mhamoud Alfa ABDULLAHI, Pei XIAO, Yonghong GAO, Jan JOHANSSON
  • Patent number: 10142976
    Abstract: A cellular telecommunications system and method of scheduling a group of user equipments is provided. The system includes a macro cell with a macro base station and multiple associated low power nodes (LPN's). The macro base station and the LPN's share the same cell ID. The system and method provide for scheduling a group of UE's by grouping a plurality of the UE's together, assigning a group identifier to the group, notifying the group and encoding a control channel with the group identifier. A single control channel is delivered to each UE in the group of UE's. The UE's of the group of UE's may be processed by different LPN's. The transmitted control channel may be included in a DCI (downlink control information) and delivers uplink scheduling grants to the UE's. Based on the transmitted control channel, the UE's are scheduled for uplink transmission.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: November 27, 2018
    Assignee: ZTE TX INC.
    Inventors: Thorsten Schier, Patrick Svedman, Aijun Cao, Yonghong Gao, Jan Johansson, Bojidar Hadjiski
  • Patent number: 10117115
    Abstract: A method, system and non transitory, tangible computer readable storage medium provides for controlling the BLER (block error rate) in a digital communication system. The outer loop control of the system discounts responses sent by a receiver to data transmission from a transmitter that were sent during a receiver outage event. Either the NACKs or both the ACKs and NACKs sent by the receiver during receiver outage are discounted by the outer loop control which adapts subsequent transmissions by either directly adjusting transmission parameters or by adjusting the selection of transmission parameters. The adapting may be based on individual NACKs and ACKs or after establishing a BLER.
    Type: Grant
    Filed: December 12, 2013
    Date of Patent: October 30, 2018
    Assignee: ZTE TX INC.
    Inventors: Patrick Svedman, Jan Johansson, Thorsten Schier, Bojidar Hadjiski, Aijun Cao, Yonghong Gao
  • Patent number: 10057004
    Abstract: A method of small cell discovery in a wireless network deployment using a Channel State Information Reference System (CSI-RS) is proposed. First, a wireless communication system allocates pairs of resource elements in each resource block of a subframe to a CSI-RS configuration. A first of two orthogonal cover codes is applied to the first CSI-RS. The CSI-RS is transmitted by a small cell to a user equipment (UE). The UE utilizes the CSI-RS to perform small cell discovery and measurement of the small cell.
    Type: Grant
    Filed: December 11, 2014
    Date of Patent: August 21, 2018
    Assignee: ZTE WISTRON TELECOM AB
    Inventors: Aijun Cao, Yonghong Gao, Thorsten Schier, Jan Johansson, Patrick Svedman, Bojidar Hadjiski
  • Patent number: 9986520
    Abstract: Provided is a synchronization cell used in a wireless communication system. Also provided is an SCI, synchronization cell indicator. A mobile network includes a processor that identifies one or more suitable synchronization cells for a user equipment (UE) and sends the SCI to the UE so that the UE can at least partially synchronize with a synchronization cell. The SCI advantageously includes a cell-id and other synchronization parameters and characteristics in various embodiments. The SCI may include a cell-directed UE action for the UE to carry out with a target cell. The UE carries out cell-directed UE actions with the target cell either after having obtained synchronization with the synchronization cell or to continue the synchronization process.
    Type: Grant
    Filed: July 21, 2014
    Date of Patent: May 29, 2018
    Assignee: ZTE WISTRON TELECOM AB
    Inventors: Patrick Svedman, Thorsten Schier, Yonghong Gao, Jan Johansson, Aijun Cao, Bojidar Hadjiski
  • Patent number: 9980217
    Abstract: A new approach to generating a probing signal by a cell in a heterogeneous network (HetNet) deployment is proposed. A small cell in the HetNet may be switched off by a base station when the small cell is not needed. The small cell is configured to alternate between an off-state and on-state. The small cell maintains the on-state for a predetermined probing period and maintains the off-state for a predetermined off period. The small cell may switch between the on-state and the off-state periodically. The small cell may be activated during a predetermined off period to transmit data to a user device.
    Type: Grant
    Filed: October 31, 2014
    Date of Patent: May 22, 2018
    Assignee: ZTE WISTRON TELECOM AB
    Inventors: Patrick Svedman, Thorsten Schier, Yonghong Gao, Jan Johansson, Aijun Cao, Bojidar Hadjiski
  • Patent number: 9980314
    Abstract: The proposed approach contemplates systems and methods configured to transmit signals irregularly (sparsely) over a mobile communication network (carrier) in which reception gaps apply while increasing the likelihood that receivers will receive a signal at least once during a certain time period, called irregular signal period. First, a set of transmission offsets is selected, the transmission offsets defining a relative transmission time in a burst, such that if a burst would be transmitted using the selected transmission offsets, a receiver with any valid reception gap configuration would receive at least one signal in its whole duration. Then, during an irregular signal period, signals are transmitted in a sequence of one or more consecutive bursts using each of the transmission offsets in the selected set at least once, wherein the sequence of bursts may be preceded and/or followed by a period of no signal transmission.
    Type: Grant
    Filed: September 16, 2014
    Date of Patent: May 22, 2018
    Assignee: ZTE WISTRON TELECOM AB
    Inventors: Patrick Svedman, Yonghong Gao, Aijun Cao, Thorsten Schier, Bojidar Hadjiski, Jan Johansson
  • Patent number: 9967809
    Abstract: The proposed approach contemplates systems and methods configured to utilize a modified reference signal to facilitate efficient discovery of as many cells as possible within one channel state information reference signal (CSI-RS) sub-frame while maintaining certain detection and measurement performance. The proposed approach is configured to unambiguously discover at least the number of anticipated small cells within one cluster and to further identify all small cells within the coverage area of a base station/macro cell. In some embodiments, frequency multiplexing is utilized to allow different cells to transmit their discovery signals on different physical resource blocks (PRBs) rather than one cell using every PRB over the entire system bandwidth.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: May 8, 2018
    Assignee: ZTE Wistron Telecom AB
    Inventors: Thorsten Schier, Patrick Svedman, Aijun Cao, Yonghong Gao, Jan Johansson, Bojidar Hadjiski
  • Patent number: 9936373
    Abstract: In a heterogeneous network deployment that includes a macro base station and one or more low power nodes, a discovery signal is transmitted to facilitate the identification of low power nodes. The discovery signal is transmitted on a selected subset of resource elements, previously unused, to maintain backward compatibility with legacy user equipment. The transmission sequence and/or the locations of resource elements used for transmitting the discovery signal can identify the low power node to a user equipment.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: April 3, 2018
    Assignee: ZTE Wistron Telecom AB
    Inventors: Thorsten Schier, Patrick Svedman, Aijun Cao, Yonghong Gao, Jan Johansson, Bojidar Hadjiski
  • Patent number: 9900130
    Abstract: Disclosed is a method for sending a signal, comprising: a small cell sending a discovery signal (DS) in a corresponding sending mode according to a current state of the small cell. Further disclosed is a device for sending a signal. In the present invention, according to the current state of the small cell, an access state of the small cell is adjusted in real time, thereby significantly reducing the interference of the small cell to a neighbor cell, improving the system performance, and being able to reduce the energy consumption of the small cell.
    Type: Grant
    Filed: May 12, 2014
    Date of Patent: February 20, 2018
    Assignee: ZTE Corporation
    Inventors: Hanqing Xu, Yajun Zhao, Linmei Mo, Yonghong Gao, Aijun Cao
  • Publication number: 20180034592
    Abstract: A system and method for robust data retransmission is disclosed. In one embodiment, a method performed by a first communication node includes: transmitting a first signal, the first signal comprising a transport block comprising a plurality of coding blocks; receiving a feedback signal, the feedback signal associated with a plurality of groups, each of the groups in the plurality of groups comprising at least one of the coding blocks; and puncturing at each of the groups in accordance with the feedback signal to produce a plurality of punctured groups.
    Type: Application
    Filed: July 27, 2017
    Publication date: February 1, 2018
    Inventors: Aijun CAO, Yonghong GAO, Jan JOHANSSON
  • Publication number: 20170353219
    Abstract: Systems and methods for small cell distributed precoding. In one embodiment, a method includes: receiving remote precoding information from a plurality of small cells; sending local precoding information to the plurality of small cells; and transmitting an output signal as part of a joint transmission with the plurality of small cells in response to the receiving the remote precoding information, wherein the output signal is based on the remote precoding information and a user equipment data vector.
    Type: Application
    Filed: June 1, 2017
    Publication date: December 7, 2017
    Inventors: Armin DEKORSY, Henning PAUL, Dirk WUBBEN, Guang XU, Aijun CAO, Thorsten SCHIER, Yonghong GAO, Jan JOHANSSON, Patrick SVEDMAN
  • Patent number: 9838930
    Abstract: An auxiliary cell identity (ACI) is proposed besides the conventional physical cell identity carried on the synchronization channels. The ACI is designed and configured to be transmitted in one or more primary regions and one or more secondary regions and transmitted by a base station/cell to a plurality of user equipment (UEs) located within coverage of the cell in one or more transmissions. Each of the UEs is configured to detects the transmitted ACI and identifies the cell based on the detected ACI.
    Type: Grant
    Filed: July 17, 2014
    Date of Patent: December 5, 2017
    Assignee: ZTE WISTRON TELECOM AB
    Inventors: Aijun Cao, Thorsten Schier, Yonghong Gao, Jan Johansson, Patrick Svedman, Bojidar Hadjiski