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).

  • Publication number: 20160135146
    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: Application
    Filed: March 13, 2014
    Publication date: May 12, 2016
    Inventors: Thorsten Schier, Patrick Svedman, Aijun Cao, Yonghong Gao, Jan Johansson, Bojidar Hadjiski
  • Publication number: 20160119093
    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: Application
    Filed: May 12, 2014
    Publication date: April 28, 2016
    Inventors: Hanqing Xu, Yajun Zhao, Linmei Mo, Yonghong Gao, Aijun Cao
  • Publication number: 20160088495
    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: Application
    Filed: May 7, 2014
    Publication date: March 24, 2016
    Inventors: Aijun Cao, Thorsten Schier, Jan Johansson, Yonghong Gao, Patrick Svedman, Bojidar Hadjiski
  • Patent number: 9295023
    Abstract: A heterogeneous wireless communication network includes a macrocell base station that one or more low power nodes. The location of a wireless device is estimated based on feedback reports received from the wireless device in response to downlink transmissions of a reference signal. Based on the estimated location, a schedule for future transmissions of the reference signal to the wireless device are determined. The schedule specifies a frequency of transmission of the reference signals. The schedule specifies downlink transmission antenna configuration to be used for the reference signal transmissions.
    Type: Grant
    Filed: January 14, 2014
    Date of Patent: March 22, 2016
    Assignee: ZTE Wistron Telecom AB
    Inventors: Thorsten Schier, Patrick Svedman, Aijun Cao, Yonghong Gao, Jan Johansson, Bojidar Hadjiski
  • Patent number: 9258786
    Abstract: In a heterogeneous network deployment that includes a macro base station and a low power node, a geometry indicator is transmitted by the low power node to facilitate the calculation of a path loss difference value at a user equipment using power estimates of the received synchronization signal from the macro base station and received geometry indicator signal from the low power node. Using the estimated path loss difference value, the user equipment adjusts the power level of an initial preamble signal transmission to the macro base station.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: February 9, 2016
    Assignee: ZTE Wistron Telecom AB
    Inventors: Aijun Cao, Yonghong Gao, Jan Johansson, Patrick Svedman, Thorsten Schier, Bojidar Hadjiski
  • Publication number: 20160037552
    Abstract: A system includes a downlink transmitter unit, a downlink scheduler unit, and an uplink receiver unit. At least one of the units is located at a physically separate location from others of the units, and the at least one of the units communicates with the others of the units over a backhaul. A controller that allocates a number of hybrid automatic repeat request (HARQ) processes according to any communication delays caused by the backhaul.
    Type: Application
    Filed: March 14, 2014
    Publication date: February 4, 2016
    Inventors: Patrick Svedman, Jan Johansson, Thorsten Schier, Bojidar Hadjiski, Aijun Cao, Yonghong Gao
  • Publication number: 20150333876
    Abstract: A system and method of responding to a receiver outage event, which includes: determining if a receiver outage event has occurred; if a receiver outage event has occurred, discarding soft bits that were corrupted due to the outage event; and if a received first redundancy version (RV) of coded bits corrupted by the outage event was decoded incorrectly, sending a message to a transmitter in response to the outage event, and thereafter receiving a second RV of coded bits retransmitted by the transmitter in response to the message.
    Type: Application
    Filed: December 11, 2013
    Publication date: November 19, 2015
    Inventors: Patrick SVEDMAN, Jan JOHANSSON, Thorsten SCHIER, Bojidar HADJISKI, Aijun CAO, Yonghong GAO
  • Publication number: 20150334573
    Abstract: A new approach to deployment of a hybrid node in a cellular communication network is proposed, wherein the hybrid node includes a plurality of antennas that simultaneously serve a plurality of cells in the cellular communication network by transmitting or receiving signals to or from the cells at the same time. The cellular communication network further includes a partner cell among the plurality of cells served by the hybrid node, wherein the partner cell is a soft cell that maintains communication channels with antennas of more than one node at the same time. The cellular communication network further includes a hybrid cell among the plurality of cells also served by the hybrid node, wherein the hybrid cell is a hard cell that maintains communication channels with antennas of only one node at any one time.
    Type: Application
    Filed: December 23, 2013
    Publication date: November 19, 2015
    Inventors: Patrick SVEDMAN, Aijun CAO, Yonghong GAO
  • Publication number: 20150319678
    Abstract: A new approach to anti-blocking cellularcommunication for HetNet deployment is proposed. First, a block detector sends a block indicator from an LPN to a scheduler in a macro base station. The scheduler then collects the block indicator statistics of each LPN on a sub-frame basis and updates the statistics in each sub-frame. If the statistics of received block indicators for one sub-frame during an observation period of a specific LPN exceeds a first predefined threshold, then the scheduler will not schedule any more uplink transmission to the LPN during the sub-frame for those UEs which are connected to the LPN. When the statistics of received block indicators becomes less than a second predefined threshold, which is less than the first threshold, the scheduler removes the limitation on uplink transmission to the LPN and allocates the sub-frame of the LPN as usual.
    Type: Application
    Filed: December 11, 2013
    Publication date: November 5, 2015
    Applicant: ZTE WISTRON TELECOM AB
    Inventors: Jan JOHANSSON, Aijun CAO, Patrick SVEDMAN, Thorsten SCHIER, Yonghong GAO, Bojidar HADJISKI
  • Publication number: 20150296394
    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: Application
    Filed: December 12, 2013
    Publication date: October 15, 2015
    Inventors: Patrick Svedman, Jan Johansson, Thorsten Schier, Bojidar Hadjiski, Aijun Cao, Yonghong Gao
  • Patent number: 9154342
    Abstract: The present document discloses an apparatus and method for cancelling in-band interference in a cellular telecommunication system which using multiple-input multiple-output technique. The method includes: receiving a transmitted signal and obtaining an interfering data stream; calculating a value of a credit; deciding whether the credit is above a predefined threshold; regenerating an interference signal by using the interfering data stream if the credit is above the predefined threshold; subtracting the regenerated interference signal from the received transmitted signal to obtain a target signal; and demodulating and decoding the target signal. By using the apparatus and method, the concerned signal can be regenerated even when there is only small number of error bits while all the other bits are correctly decoded. Also, the target stream would be able to know whether the interfering stream can be regenerated or not, before the decoding.
    Type: Grant
    Filed: May 9, 2012
    Date of Patent: October 6, 2015
    Assignee: ZTE Wistron Telecom AB
    Inventors: Aijun Cao, Thorsten Schier, Yonghong Gao
  • Publication number: 20150253414
    Abstract: This invention provides a system and methods for tracking the positions and behaviors of moving objects such as animals. In one embodiment, the system comprises one or more tracking unit, one or more base nodes, one or more remote data hubs, and one or more remote processor with display. Each tracking unit (e.g. attached or inserted into the tracked animals) could transmit acoustic signal with a unique signature. The base nodes, after time stamping the received signals, relate the signals to the remote processors where the signals will be processed and the 3-dimensional spatial coordinates of the tracking units, and hence the animals, can be identified. Further processing of the positional information would reflect the activities and behaviors of each animal. Additional sensors included in the tracking unit provide further information about the states of the animals such as temperature, heart rate or blood pressure etc.
    Type: Application
    Filed: September 5, 2013
    Publication date: September 10, 2015
    Inventors: Chi Shing Chan, Aijun Cao
  • Publication number: 20140328438
    Abstract: The present document discloses an apparatus and method for cancelling in-band interference in a cellular telecommunication system which using multiple-input multiple-output technique. The method includes: receiving a transmitted signal and obtaining an interfering data stream; calculating a value of a credit; deciding whether the credit is above a predefined threshold; regenerating an interference signal by using the interfering data stream if the credit is above the predefined threshold; subtracting the regenerated interference signal from the received transmitted signal to obtain a target signal; and demodulating and decoding the target signal. By using the apparatus and method, the concerned signal can be regenerated even when there is only small number of error bits while all the other bits are correctly decoded. Also, the target stream would be able to know whether the interfering stream can be regenerated or not, before the decoding.
    Type: Application
    Filed: May 9, 2012
    Publication date: November 6, 2014
    Applicant: ZTE Wistron Telecom AB
    Inventors: Aijun Cao, Thorsten Schier, Yonghong Gao
  • Publication number: 20140200009
    Abstract: A heterogeneous wireless communication network includes a macrocell base station that one or more low power nodes. The location of a wireless device is estimated based on feedback reports received from the wireless device in response to downlink transmissions of a reference signal. Based on the estimated location, a schedule for future transmissions of the reference signal to the wireless device are determined. The schedule specifies a frequency of transmission of the reference signals. The schedule specifies downlink transmission antenna configuration to be used for the reference signal transmissions.
    Type: Application
    Filed: January 14, 2014
    Publication date: July 17, 2014
    Applicant: ZTE Wistron Telecom AB
    Inventors: Thorsten Schier, Patrick Svedman, Aijun Cao, Yonghong Gao, Jan Johansson, Bojidar Hadjiski
  • Publication number: 20140126553
    Abstract: In a heterogeneous wireless network that includes a macro base station and one or more micro base stations, a wireless device to wirelessly transmit, in a first time slot at a first position in a first transmission subframe, data over a first physical communication channel. An ACK/NACK control message is received over a backhaul network connection a first time period after the first time slot. A response message is transmitted to the wireless device such that when the control message is received prior to the second time slot, then the response message uses data reception information from the control message and when the control message is not received prior to the second time slot, then the response message indicates that the data was successfully received.
    Type: Application
    Filed: October 31, 2013
    Publication date: May 8, 2014
    Inventors: Nan Li, Thorsten Schier, Patrick Svedman, Yonghong Gao, Aijun Cao, Jan Johansson, Bojidar Hadjiski
  • Publication number: 20140092861
    Abstract: In a heterogeneous network deployment that includes one or more macro base stations and one or more low power nodes, a technique can be provided to encode network operational information using phase differences in synchronization signals transmitted by a network node. The synchronization signals may be one of the first signals that a user equipment (UE) attempts to locate when attempting to join a wireless network. The phase-encoded network operational information indicates to the UE where to locate a geometry indicator transmission from a low power node that is a part of the network, but is not the node that transmits the synchronization signals. The geometry indicator transmission may include identity information for the transmitting node and may be transmitted at a pre-determined nominal transmit power.
    Type: Application
    Filed: September 27, 2013
    Publication date: April 3, 2014
    Inventors: Yonghong Gao, Aijun Cao, Jan Johansson, Patrick Svedman, Thorsten Schier, Bojidar Hadjiski
  • Publication number: 20140092879
    Abstract: A heterogeneous wireless communication network comprises a macrocell base station that includes a first transmission point, at least one microcell base station that includes a second transmission point and a controller configured to enable transmission of wireless data from the macrocell base station and the at least one microcell base station to a user equipment (UE). The controller is configured to determine a set of transmission point combinations for providing downlink data, determine, using a statistics of ACKs and NACKs received for previous downlink transmissions from the transmission point combinations, a sequence of downlink transmissions to the UE from the transmission point combinations in the set.
    Type: Application
    Filed: October 2, 2013
    Publication date: April 3, 2014
    Applicant: ZTE WISTRON TELECOM AB
    Inventors: Jan Johansson, Patrick Svedman, Yonghong Gao, Aijun Cao, Thorsten Schier, Bojidar Hadjiski
  • Publication number: 20140064211
    Abstract: In a heterogeneous network deployment that includes a macro base station and a low power node, a geometry indicator is transmitted by the low power node to facilitate the calculation of a path loss difference value at a user equipment using power estimates of the received synchronization signal from the macro base station and received geometry indicator signal from the low power node. Using the estimated path loss difference value, the user equipment adjusts the power level of an initial preamble signal transmission to the macro base station.
    Type: Application
    Filed: August 29, 2013
    Publication date: March 6, 2014
    Inventors: Aijun Cao, Yonghong Gao, Jan Johansson, Patrick Svedman, Thorsten Schier, Bojidar Hadjiski
  • Publication number: 20130176841
    Abstract: The present document discloses an apparatus for receiving Physical Uplink Control Channel (PUCCH) in Long Term Evolution (LTE) system, comprising: blocks of system FFT performing system FFT on data from a plurality of antennas, blocks of PUCCH RB processing units receiving the allocated logic resource index table and the local base sequence and output of the blocks of system FFT, and generating DMRS despread outputs and data values; a block of SR detection for receiving the data values and the DMRS despread outputs, and for generating SR detection results; blocks of user data extraction receiving data values and DMRS despread outputs, and performing user data extraction; blocks of PUCCH user processing units receiving an orthogonal sequence index, the data values and an output from blocks of user data extraction, and generating a ACK/NAK/CQI signal for a concerned UE.
    Type: Application
    Filed: July 9, 2010
    Publication date: July 11, 2013
    Applicant: ZTE WISTRON TELECOM AB
    Inventors: Aijun Cao, Jan Johansson, Xiaoming Su, Yujie Li
  • Patent number: 8200267
    Abstract: A robust method of page indication (PI) detection improves the probability of detecting a transmitted PI under conditions that decrease the probability of accurate PI detection. The method includes choosing a standard value of a PI threshold against which to compare accumulated PI bits when the probability of correctly detecting the PI is high, and choosing a derived value of the PI threshold lower than the standard value when the probability of correctly detecting the PI is low. The derived PI threshold value determination includes a factor indicative of a desired probability of accurate PI detection.
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: June 12, 2012
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Aijun Cao, Andreas Jakobsson, Jan Johansson, Fredrik Lundberg