Patents by Inventor Sara Modarres Razavi

Sara Modarres Razavi 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: 10834695
    Abstract: According to certain embodiments, a method is disclosed for use in a wireless device that is configured as a Narrowband Internet-of-Things (NB-IoT) device or a machine-type-communication (MTC) device. The method comprises determining at least one parameter related to positioning. The at least one parameter is based on a capability of the wireless device that relates to observed time difference of arrival (OTDOA) positioning with NB-IoT or MTC. The method further comprises using the determined at least one parameter related to positioning.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: November 10, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Sara Modarres Razavi, Johan Bergman, Fredrik Gunnarsson, Olof Liberg, Xingqin Lin, Henrik Rydén, Iana Siomina, Yutao Sui
  • Patent number: 10809350
    Abstract: Methods and devices for performing hybrid fingerprinting/observed time difference of arrival (OTDOA) positioning are described. Fingerprinting information can be used to improve OTDOA results by using the fingerprinting information to generate OTDOA assistance information. The OTDOA assistance information is sent to a user equipment, which uses the OTDOA assistance information to perform reference signal time differences (RSTDs) measurements.
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: October 20, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Di Shu, Sara Modarres Razavi, Kunpeng Qi, Arios Yu, Ali Zaidi
  • Publication number: 20200322915
    Abstract: A method, performed by a wireless device (120), for reporting at least one measurement to a network node (130) is disclosed. The wireless device (120) determines (420) an extended format to be used for reporting, to the network node (130), at least one of: a code phase measurement, a carrier phase measurement or a GNSS Signal ID. The extended format extends at least one of: a range or a resolution, of an existing format for reporting the at least one of: the code phase measurement, the carrier phase measurement or the GNSS Signal ID. The wireless device (120) then sends (430) a measurement report comprising the at least one of: the code phase measurement, the carrier phase measurement or the GNSS Signal ID, to the network node (130), using the determined extended format. A method performed by the network node (130) is also described, whereby the network node (130) receives the measurement report.
    Type: Application
    Filed: August 10, 2018
    Publication date: October 8, 2020
    Inventors: Xin Zhang, Fredrik Gunnarsson, Sara Modarres Razavi, Henrik Rydén, Ritesh Shreevastav
  • Patent number: 10798674
    Abstract: Methods and device for use in a wireless device of reporting positioning measurements comprises receiving network assistance information from a network node. The network assistance information is for assisting the wireless device in performing Observed Time Difference Of Arrival (OTDOA), and comprises: a list of reference cells; a list of neighbor cells; and a rule for terminating Reference Signal Time Difference (RSTD) measurements. The method further comprises performing RSTD measurement between a cell in the reference cell list and a cell in the neighbor cell list. Upon determining the RSTD measurement satisfies the rule for terminating RSTD measurements, the method includes reporting the RSTD measurements to the network node. Upon determining the RSTD measurement does not satisfy the rule for terminating RSTD measurements, performing another RSTD measurement between the cell in the reference cell list and a cell in the neighbor cell list.
    Type: Grant
    Filed: November 3, 2017
    Date of Patent: October 6, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Sara Modarres Razavi, Johan Bergman, Åke Busin, Fredrik Gunnarsson, Olof Liberg, Xingqin Lin, Henrik Rydèn, Yutao Sui, Martin Van Der Zee
  • Publication number: 20200304226
    Abstract: A method and a user equipment (110) as well as a method and a radio transmitter (120) for managing positioning reference signals are disclosed. Moreover, a method and a network node (130) for configuring positioning reference signals are disclosed. The network node (130) sends (A050), to the user equipment (110), a reception configuration of positioning reference signals, wherein the reception configuration comprises a cell identity relating to the radio transmitter (120) and an identifier for determining of positioning reference signals. The network node (130) sends (A070), to the radio transmitter (120), a transmit configuration of positioning reference signals, wherein the transmit configuration comprises the cell identity and the identifier. The radio transmitter (120) determines (A090) the positioning reference signals based on the cell identity and the identifier. The radio transmitter (120) sends (A100) the positioning reference signals to the user equipment (110).
    Type: Application
    Filed: June 8, 2020
    Publication date: September 24, 2020
    Inventors: Henrik RYDÉN, Fredrik GUNNARSSON, Sara MODARRES RAZAVI, Meng WANG
  • Publication number: 20200296681
    Abstract: A method, apparatus, and system are provided for facilitating positioning based on signal correlation function characteristic feedback. In an embodiment, the method may involve steps performed by a network node in communication with a wireless communication device (WCD) and a plurality of base stations. The network node receives, from the WCD, location information including position reference signal (PRS) correlation function characteristics of a cross-correlation between a received downlink signal and a transmitted PRS for each base station from the plurality of base stations. The network node determines a position of the WCD using the PRS correlation function characteristics. The WCD may initiate the transmission of the PRS correlation function characteristics on its own, or in response to a request to do so from the network node.
    Type: Application
    Filed: June 2, 2020
    Publication date: September 17, 2020
    Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Fredrik GUNNARSSON, Sara MODARRES RAZAVI, Henrik RYDÉN, Meng WANG, Ali ZAIDI
  • Patent number: 10779125
    Abstract: Embodiments herein relate to a method performed by a target device (10), for handling positioning of the target device. The target device determines one or more displacements of the target device (10) in relation to a reference position based on measurements performed by at least one location source. The target device (10) sends, to a network node (20), a report comprising the determined one or more displacements of the target device (10), and a reference time to which the reference position is associated. Embodiments herein further relate to a method performed by a network node (20), for handling positioning of the target device (10). The network node obtains, from the target device (10), a report comprising the determined one or more displacements of the target device (10) in relation to a reference position, wherein the one or more displacements have been determined based on measurements performed by at least one location source, and a reference time to which the reference position is associated.
    Type: Grant
    Filed: February 7, 2019
    Date of Patent: September 15, 2020
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Henrik Rydén, Fredrik Gunnarsson, Sara Modarres Razavi, Ritesh Shreevastav
  • Publication number: 20200280820
    Abstract: According to one of the aspects of the proposed technology, there is provided a method for positioning of a target device in a wireless communication system. The method comprises obtaining beam quality information relating to reference beams transmitted from at least two network nodes according to specific beam patterns, and obtaining beam pattern information representative of the specific beam patterns. The method also comprises determining a position of the target device based on the beam quality information and the beam pattern information. In this way, improved positioning accuracy may be obtained in an efficient manner.
    Type: Application
    Filed: September 13, 2017
    Publication date: September 3, 2020
    Inventors: Xin Zhang, Fredrik Gunnarsson, Henrik Rydén, Sara Modarres Razavi
  • Publication number: 20200241106
    Abstract: Methods and devices for performing hybrid fingerprinting/observed time difference of arrival (OTDOA) positioning are described. Fingerprinting information can be used to improve OTDOA results by using the fingerprinting information to generate OTDOA assistance information. The OTDOA assistance information is sent to a user equipment, which uses the OTDOA assistance information to perform reference signal time differences (RSTDs) measurements.
    Type: Application
    Filed: February 19, 2016
    Publication date: July 30, 2020
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Di SHU, Sara MODARRES RAZAVI, Kunpeng QI, Arios YU, Ali ZAIDI
  • Patent number: 10727970
    Abstract: A method and a user equipment (110) as well as a method and a radio transmitter (120) for managing positioning reference signals are disclosed. Moreover, a method and a network node (130) for configuring positioning reference signals are disclosed. The network node (130) sends (A050), to the user equipment (110), a reception configuration of positioning reference signals, wherein the reception configuration comprises a cell identity relating to the radio transmitter (120) and an identifier for determining of positioning reference signals. The network node (130) sends (A070), to the radio transmitter (120), a transmit configuration of positioning reference signals, wherein the transmit configuration comprises the cell identity and the identifier. The radio transmitter (120) determines (A090) the positioning reference signals based on the cell identity and the identifier. The radio transmitter (120) sends (A100) the positioning reference signals to the user equipment (110).
    Type: Grant
    Filed: May 11, 2017
    Date of Patent: July 28, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Henrik Rydén, Fredrik Gunnarsson, Sara Modarres Razavi, Meng Wang
  • Publication number: 20200236644
    Abstract: Embodiments herein disclose a method performed by a wireless device for managing positioning of the wireless device in the wireless communications network. The wireless device obtains, from a network node, assistance data or configuration data comprising two or more positioning reference signal, PRS, configurations associated with a radio network node or a service area of the radio network node. The wireless device further indicates, to the network node, a scope of usage of the two or more PRS configurations with an indication.
    Type: Application
    Filed: January 26, 2018
    Publication date: July 23, 2020
    Inventors: Fredrik Gunnarsson, Henrik Rydén, Sara Modarres Razavi
  • Patent number: 10721015
    Abstract: A Radio Network Node (RNN) and a method for enabling an improved reception of Positioning Reference Signals (PRSs) at a communications device. The RNN and the communications device are operable in a wireless communications network. The RNN selects a first precoder and a second precoder for forming a first beam and a second beam, respectively, and obtains a precoding switching pattern relating to when the first precoder is to be applied to one or more first PRS symbols and when the second precoder is to be applied to one or more second PRS symbols. Further, the RNN transmits, to the communications device, the one or more first PRS symbols to which the first precoder is applied; and in accordance with the obtained precoding switching pattern, the RNN transmits, to the communications device, the one or more second PRS symbols to which the second precoder is applied.
    Type: Grant
    Filed: April 20, 2016
    Date of Patent: July 21, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Henrik Rydén, Fredrik Gunnarsson, Sara Modarres Razavi, Ali Zaidi, Meng Wang
  • Publication number: 20200217918
    Abstract: There is provided a method for providing Observed Time Difference of Arrival (OTDOA) Reference Signal Time Difference (RSTD) measurements from a wireless device to a location server. The method comprises sending, from the wireless node to the location server, a capability to support OTDOA location measurements using multipath RSTD, receiving, at the wireless node, a request for OTDOA location measurements using multipath RSTD, from the location server. The method comprises receiving, at the wireless node, assistance data providing details of required OTDOA location measurements using multipath RSTD from the location server, receiving, at the wireless node, a signal from an RSTD reference cell and a neighbor cell. The method comprises observing, at the wireless node, a time difference between the received signals thereby obtaining the required OTDOA location measurements using multipath RSTD and sending the required OTDOA location measurements using multipath RSTD from the wireless node to the location server.
    Type: Application
    Filed: November 1, 2017
    Publication date: July 9, 2020
    Inventors: Henrik Rydén, Sara Modarres Razavi, Fredrik Gunnarsson, Kai-Erik Sunell
  • Patent number: 10708881
    Abstract: A method, apparatus, and system are provided for facilitating positioning based on signal correlation function characteristic feedback. In an embodiment, the method may involve steps performed by a network node in communication with a wireless communication device (WCD) and a plurality of base stations. The network node receives, from the WCD, location information including position reference signal (PRS) correlation function characteristics of a cross-correlation between a received downlink signal and a transmitted PRS for each base station from the plurality of base stations. The network node determines a position of the WCD using the PRS correlation function characteristics. The WCD may initiate the transmission of the PRS correlation function characteristics on its own, or in response to a request to do so from the network node.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: July 7, 2020
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Fredrik Gunnarsson, Sara Modarres Razavi, Henrik Rydén, Meng Wang, Ali Zaidi
  • Publication number: 20200178200
    Abstract: The embodiments herein relate to a method, performed by a target device (10), for handling positioning of the target device (10). The target device obtains, from a network node (20), a sensor reporting configuration. The target device obtains sensor measurements. The target device determines a reporting scope based on the obtained sensor measurements according to the obtained sensor reporting configuration. The target device sends, to the network node (20), a measurement report comprising the sensor measurements according to the determined reporting scope, wherein the measurement report comprises a displacement of the target device relative to a reference position. The embodiments further relate to a a corresponding method performed by the network node (20).
    Type: Application
    Filed: July 11, 2018
    Publication date: June 4, 2020
    Inventors: Fredrik Gunnarsson, Sara Modarres Razavi, Henrik Rydén
  • Patent number: 10673485
    Abstract: A method and a receiving node for determining Time Of Arrival (TOA) for a radio signal received from a transmitting node in a wireless network. The receiving node detects the received radio signal by cross-correlating the received radio signal with a predefined reference signal transmitted by the transmitting node, to obtain a Cross-Correlated Function (CCF). The receiving node then estimates a set of candidate TOAs for respective signal components of the cross-correlated signal, and determines a final TOA for the received radio signal based on the set of candidate TOAs.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: June 2, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Henrik Rydén, Fredrik Gunnarsson, Sara Modarres Razavi, Ali Zaidi
  • Publication number: 20200169336
    Abstract: The present disclosure relates to radio network communication. In one of its aspects, the disclosure presented herein concerns a method for performing beam-based positioning. The method is implemented in a target device. According to the method, a list of transmitter beam IDentities (IDs) accompanied with corresponding beam-based Positioning Reference Signal (PRS) configurations for one or more radio cells associated with one or more radio network nodes are received. Different beam-based PRS sequences are used for different transmitter beams of one radio network node. Based on the received list of transmitter beam IDs accompanied with corresponding PRS configurations, a set of transmitter beams for subsequent measuring are determined.
    Type: Application
    Filed: November 26, 2018
    Publication date: May 28, 2020
    Inventors: Sara Modarres Razavi, Fredrik Gunnarsson, Henrik Rydén, Iana Siomina
  • Patent number: 10656241
    Abstract: A method performed by a wireless device for reporting an RSTD value to a network node of a wireless communication network. The method includes receiving a configuration of positioning reference signals (PRSs) from the network node, the configuration indicating a plurality of PRS identities for respective transmission points (TPs) of the wireless communication network, determining an RSTD value for a TP based on the received configuration, and reporting the determined RSTD value for the TP to the network node. A first frequency reuse factor for the PRSs that is lower than a default second frequency reuse factor may be used.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: May 19, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Henrik Rydén, Fredrik Gunnarsson, Xingqin Lin, Sara Modarres Razavi
  • Patent number: 10644775
    Abstract: A signal quality associated with radio transmissions from a first device (100) to a second device (10) is determined. Further, an uncertainty of the determined signal quality is determined. Depending on the determined signal quality and uncertainty, a beamforming configuration, applied by the first device (100) for performing the radio transmissions to the second device (10), is adapted.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: May 5, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Sara Modarres Razavi, Mirsad Cirkic, Martin Hessler, Reza Moosavi, Henrik Rydén
  • Publication number: 20200128506
    Abstract: Methods and nodes (110; 115; 116; 117; 120; 121; 130; 140) for managing position information associated with a group of wireless devices (120-121) configured to be served in a wireless communication network (100). It is obtained (201; 301-303; 501; 501a-b) information indicating a first wireless device (120) as member and positioning representative of the group and at least one other, second, wireless device (121) as further member of the group. Said at least one second wireless device (121) being able to communicate wirelessly and directly with the first wireless device (120) over a direct communication link (125). A position of said at least one second wireless device (121) is estimated based on communication of positioning supporting information over said direct communication link (125).
    Type: Application
    Filed: June 12, 2018
    Publication date: April 23, 2020
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Xin ZHANG, Samuel AXELSSON, Fredrik GUNNARSSON, Kjell LARSSON, Jawad MANSSOUR, Sara MODARRES RAZAVI