Patents by Inventor Henrik Sahlin

Henrik Sahlin 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).

  • METHODS, NETWORK NODES, AND COMPUTER PROGRAMS FOR TRANSMIT TIMING ADJUSTMENT
    Publication number: 20210084657
    Abstract: There is provided mechanisms for transmit timing adjustment. A method is performed by a second network node. The method comprises obtaining an indication of beam link failure of a current beam. The current beam is used for ongoing communication with a first network node. The method comprises switching over to a backup beam of the current beam for continuing the ongoing communication with the first network node. The method comprises adjusting transmit timing for transmitting a signal as part of the ongoing communication in the backup beam based on earlier communicated timing information with the first network node before making any transmission of the signal on the backup beam.
    Type: Application
    Filed: April 26, 2018
    Publication date: March 18, 2021
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Mona HASHEMI, Henrik SAHLIN, Per-Erik ERIKSSON, Behrooz MAKKI, Lei BAO, Andreas NILSSON, Mikael COLDREY
  • UL scheduling timing with short TTIs in TDD
    Patent number: 10952100
    Abstract: Systems and methods for determining and utilizing an uplink scheduling timing when using short Transmission Time Intervals (sTTIs) are disclosed. In some embodiments, a method of operation of a wireless device in a cellular communications network comprises receiving an uplink grant in sTTI n; determining, based on a configured uplink/downlink configuration, an uplink scheduling timing I; and transmitting, in a sTTI n+I, an uplink transmission in accordance with the uplink grant received in the sTTI n. In this manner, an uplink timing is determined and utilized when using sTTIs.
    Type: Grant
    Filed: August 10, 2017
    Date of Patent: March 16, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Jingya Li, Laetitia Falconetti, Daniel Larsson, Henrik Sahlin, Gustav Wikström
  • Random access preamble slot allocation
    Patent number: 10952258
    Abstract: An example method for transmitting a random access preamble comprises selecting (502) a random access preamble configuration from a plurality of predetermined random access preamble configurations. The method further includes determining (504) a time interval in which to transmit the random access preamble. The method further comprises transmitting (506) the random access preamble according to the selected random access preamble configuration. Each of the plurality of random access preamble configurations comprises a combination of (a) a single root sequence from a predetermined set of one or more root sequences, (b) a single cyclic shift of a predetermined plurality of cyclic shifts for the root sequence, and (c) a single starting position of two or more predetermined starting positions within time intervals allocated for random access preamble transmission.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: March 16, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Andres Reial, Henrik Sahlin, Oskar Mauritz
  • Wireless device, a network node and methods therein for reporting channel state information (CSI) in a radio communications network
    Patent number: 10945272
    Abstract: A method performed by a wireless device (121, 122) for determining Channel State Information, CSI, estimates to be transmitted in a CSI report for the wireless device (121, 122) to a network node (110) in a radio communications network (100) is provided. The wireless device (121, 122) receives a message comprising an indication to use CSI estimates corresponding to a determined period of time. In response to said message, the wireless device (121, 122) determines CSI estimates to be used in the CSI report to the network node (110) according to the received indication. A wireless device (121, 122) is also described. A network node (110) and method therein for controlling CSI estimates transmitted by one or more wireless devices (121, 122) in CSI reports to the network node (110) in a radio communications network (100) are also provided.
    Type: Grant
    Filed: April 24, 2018
    Date of Patent: March 9, 2021
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Mattias Frenne, Qiang Zhang, Henrik Sahlin, Stefan Parkvall, Håkan Andersson, Johan Furuskog
  • RANDOM-ACCESS RESPONSE WITH ANALOG BEAMFORMING
    Publication number: 20210068145
    Abstract: A system and method of Random-Access Response, RAR, messaging when a base station employs narrow beamforming. Multiple RAR messages are successively transmitted from the base station to a User Equipment, UE, before any response to a RAR message is received from the UE. Thus, despite any calibration mismatch between Uplink, UL, and Downlink, DL, beams in the beamformed system, a RAR message is not only received by the UE, but is received over the most-suitable DL beam for that UE. Each RAR message may contain a message-specific scheduling-delay indicator in the UL grant carried in the RAR message to provide an adjustable time delay for the UE's uplink transmission scheduled by the UL grant. Multiple RAR transmissions can schedule a single UL transmission at a specific time instance or different UL transmissions at different time intervals. The UE may report to the base station the best DL RAR transmission detected by the UE.
    Type: Application
    Filed: November 17, 2020
    Publication date: March 4, 2021
    Inventors: Johan Furuskog, Henrik Sahlin, Andreas Bergström, Håkan Andersson, Niclas Wiberg, Qiang Zhang
  • Network architecture, methods, and devices for a wireless communications network
    Patent number: 10938497
    Abstract: Methods and apparatus in a fifth-generation wireless communications, including an example method, in a wireless device, that includes receiving a downlink signal comprising an uplink access configuration index, using the uplink access configuration index to identify an uplink access configuration from among a predetermined plurality of uplink access configurations, and transmitting to the wireless communications network according to the identified uplink access configuration. The example method further includes, in the same wireless device, receiving, in a first subframe, a first Orthogonal Frequency-Division Multiplexing (OFDM) transmission formatted according to a first numerology and receiving, in a second subframe, a second OFDM transmission formatted according to a second numerology, the second numerology differing from the first numerology. Variants of this method, corresponding apparatuses, and corresponding network-side methods and apparatuses are also disclosed.
    Type: Grant
    Filed: December 13, 2019
    Date of Patent: March 2, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Stefan Parkvall, Janne Peisa, Gunnar Mildh, Robert Baldemair, Stefan Wager, Jonas Kronander, Karl Werner, Richard Abrahamsson, Ismet Aktas, Peter Alriksson, Junaid Ansari, Shehzad Ali Ashraf, Henrik Asplund, Fredrik Athley, Håkan Axelsson, Joakim Axmon, Johan Axnäs, Kumar Balachandran, Gunnar Bark, Jan-Erik Berg, Andreas Bergström, Håkan Björkegren, Nadia Brahmi, Cagatay Capar, Anders Carlsson, Andreas Cedergren, Mikael Coldrey, Icaro L. J. da Silva, Erik Dahlman, Ali el Essaili, Ulrika Engström, Mårten Ericson, Erik Eriksson, Mikael Fallgren, Rui Fan, Gabor Fodor, Pål Frenger, Jonas Fridén, Jonas Fröberg Olsson, Anders Furuskär, Johan Furuskog, Virgile Garcia, Ather Gattami, Fredrik Gunnarsson, Ulf Gustavsson, Bo Hagerman, Fredrik Harrysson, Ning He, Martin Hessler, Kimmo Hiltunen, Songnam Hong, Dennis Hui, Jörg Huschke, Tim Irnich, Sven Jacobsson, Niklas Jaldén, Simon Järmyr, Zhiyuan Jiang, Niklas Johansson, Martin Johansson, Du Ho Kang, Eleftherios Karipidis, Patrik Karlsson, Ali S. Khayrallah, Caner Kilinc, Göran N. Klang, Sara Landstrom, Christina Larsson, Gen Li, Lars Lindbom, Robert Lindgren, Bengt Lindoff, Fredrik Lindqvist, Jinhua Liu, Thorsten Lohmar, Qianxi Lu, Lars Manholm, Ivana Maric, Jonas Medbo, Qingyu Miao, Reza Moosavi, Walter Müller, Elena Myhre, Karl Norrman, Bengt-Erik Olsson, Torgny Palenius, Sven Petersson, Jose Luis Pradas, Mikael Prytz, Olav Queseth, Pradeepa Ramachandra, Edgar Ramos, Andres Reial, Thomas Rimhagen, Emil Ringh, Patrik Rugeland, Johan Rune, Joachim Sachs, Henrik Sahlin, Vidit Saxena, Nima Seifi, Yngve Selén, Eliane Semaan, Sachin Sharma, Cong Shi, Johan Sköld, Magnus Stattin, Anders Stjernman, Dennis Sundman, Lars Sundström, Miurel Isabel Tercero Vargas, Claes Tidestav, Sibel Tombaz, Johan Torsner, Hugo Tullberg, Jari Vikberg, Peter von Wrycza, Thomas Walldeen, Pontus Wallentin, Hai Wang, Ke Wang Helmersson, Jianfeng Wang, Yi-Pin Eric Wang, Niclas Wiberg, Emma Wittenmark, Osman Nuri Can Yilmaz, Ali Zaidi, Zhan Zhang, Zhang Zhang, Yanli Zheng
  • Transport Block Size Determination For Short Transmission Time Interval
    Publication number: 20210051518
    Abstract: A method performed by a communication device comprises identifying a long transmission time interval (TTI) transport block size from a set of long TTI transport block sizes used for transport block transmission within a long TTI. The method further comprises determining a short TTI transport block size, used for transport block transmission within a short TTI, by downscaling the long TTI transport block size based on a relation between a number of symbols in the short TTI and a number of symbols in the long TTI that is greater than the number of symbols in the short TTI.
    Type: Application
    Filed: November 2, 2020
    Publication date: February 18, 2021
    Inventors: Gustav Wikström, Niklas Andgart, Jingya Li, Henrik Sahlin
  • FLEXIBLE DEMODULATION REFERENCE SIGNAL CONFIGURATION FOR MSG3
    Publication number: 20210045160
    Abstract: A random access procedure may be provided by a network node for use with a user equipment, UE, of a wireless communication system. A demodulation reference signal, DMRS, configuration may be selected from among a set of DMRS configurations based on obtained information. A DMRS transmission may be controlled during the random access procedure based on the selected DMRS configuration. The UE may receive an indication of the DMRS configuration from the network node, may select the DMRS configuration from among a set of DMRS configurations based on the received indication, and may control DMRS transmission during the random access procedure based on the selected DMRS configuration.
    Type: Application
    Filed: February 15, 2019
    Publication date: February 11, 2021
    Inventors: Naga Vishnu Kanth IRUKULAPATI, Henrik SAHLIN, Robert BALDEMAIR, Jingya Li
  • Method and access node for supporting UE as well as a UE and corresponding method carried out by the UE in a wireless communication system
    Patent number: 10917845
    Abstract: The present invention relates to a method and access node for supporting one or more UEs as well as to a method carried out by a UE and the UE itself which enable to use resource and energy efficiently. The method for supporting one or more user equipments, UEs, in a wireless communication system, comprises transmitting from an access node a first reference signal in a beam; determining whether the access node received at least one indication about a UE's presence in the coverage area of the beam; and switching from transmitting of the first reference signal to transmitting a second reference signal if the access node received at least one indication about a UE's presence in the coverage area of the beam.
    Type: Grant
    Filed: February 12, 2020
    Date of Patent: February 9, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Johan Rune, Icaro L. J. Da Silva, Andres Reial, Henrik Sahlin
  • Beam sweep or scan in a wireless communication system
    Patent number: 10897302
    Abstract: A user equipment is configured for use in a wireless communication system. The user equipment in this regard is configured to detect an orientation of an equipment coordinate frame defined for the user equipment relative to an earth coordinate frame defined for Earth. The user equipment is also configured to determine, based on the detected orientation, a set) of beams defined in the equipment coordinate frame which does not include any beam pointing in one or more predefined directions in the earth coordinate frame. The user equipment is further configured to perform a beam sweep or scan on the determined set of beams.
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: January 19, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Johan Rune, Icaro L. J. Da Silva, Andres Reial, Henrik Sahlin
  • Methods and devices for scheduling uplink data
    Patent number: 10893538
    Abstract: Methods and apparatus for generating a scheduling grant for a wireless device of a communication system are provided. The communication system supports variable TTI lengths to be transmitted in one TTI. It is presented how to determine a TTI length for a scheduled TTI, where the TTI length is determined in number of symbols. It is further presented how to determine at least one reference signal parameter for the scheduled TTI, where the at least one reference symbol parameter is selected from a reference symbol position and a reference symbol cyclic shift. Finally, encoding the TTI length and the at least one reference symbol parameter into a TTI index is presented.
    Type: Grant
    Filed: February 3, 2017
    Date of Patent: January 12, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Henrik Sahlin, Niklas Andgart, Gustav Wikström
  • Two-Step Contention-Based Random Access Over Radio Resources in LAA
    Publication number: 20200404717
    Abstract: A contending radio node is configured for attempting contention-based random access. The contending radio node obtains a timing advance sequence that is susceptible to contention. The contending radio node transmits, using the same transmission advancement timing, the timing advance sequence and a contention-resolving identity to a recipient radio node. Responsive to that transmission, the contending radio node receives a response signal that indicates a contention-resolving identity and a timing advance. The contending radio node resolves any contention in its favor when the contention-resolving identity indicated by the response signal corresponds to the contention-resolving identity that the contending radio node transmitted. The contending radio node, responsive to resolving the contention in its favor, adjusts its transmission advancement timing according to the timing advance indicated by the response signal.
    Type: Application
    Filed: September 8, 2020
    Publication date: December 24, 2020
    Inventors: Henrik Sahlin, Amitav Mukherjee
  • System and Method for Beam-Based Physical Random-Access
    Publication number: 20200404702
    Abstract: A method in a wireless device for performing random access to a network node. The method comprises receiving a set of downlink beam-specific reference signals, BRS, from the network node, and determining a preferred BRS based on the received signal power for each BRS. The method also comprises selecting, based on the preferred BRS, a random-access resource to be used for transmitting a random-access attempt to the network node, as well as using the selected random-access resource when transmitting a random-access attempt to the network node, whereby the selection of random-access resource indicates to the network node which downlink beam is preferred by the wireless device to be used for downlink transmissions.
    Type: Application
    Filed: September 2, 2020
    Publication date: December 24, 2020
    Inventors: Mattias FRENNE, Håkan ANDERSSON, Johan FURUSKOG, Stefan PARKVALL, Henrik SAHLIN, Qiang ZHANG
  • Configuration of physical antenna ports
    Patent number: 10862636
    Abstract: There is provided mechanisms for configuration of physical antenna ports. The method is performed by a first radio transceiver device. A method comprises determining a configuration for the second radio transceiver device. The configuration defines a mapping between the sub-carriers and the physical antenna ports and specifies which of the sub-carriers are to be transmitted on which physical antenna port at the second radio transceiver device. The method comprises providing the configuration to the second radio transceiver device.
    Type: Grant
    Filed: May 23, 2019
    Date of Patent: December 8, 2020
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Fredrik Athley, Sven Petersson, Henrik Sahlin
  • Transport block size determination for short transmission time interval
    Patent number: 10863381
    Abstract: A method performed by a communication device comprises identifying (310) a long transmission time interval (TTI) transport block size from a set of long TTI transport block sizes used for transport block transmission within a long TTI. The method further comprises determining (320) a short TTI transport block size, used for transport block transmission within a short TTI, by downscaling the long TTI transport block size based on a relation between a number of symbols in the short TTI and a number of symbols in the long TTI that is greater than the number of symbols in the short TTI.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: December 8, 2020
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Gustav Wikström, Niklas Andgart, Jingya Li, Henrik Sahlin
  • Random-access response with analog beamforming
    Patent number: 10849154
    Abstract: A system and method of Random-Access Response, RAR, messaging when a base station employs narrow beamforming. Multiple RAR messages are successively transmitted from the base station to a User Equipment, UE, before any response to a RAR message is received from the UE. Thus, despite any calibration mismatch between Uplink, UL, and Downlink, DL, beams in the beamformed system, a RAR message is not only received by the UE, but is received over the most-suitable DL beam for that UE. Each RAR message may contain a message-specific scheduling-delay indicator in the UL grant carried in the RAR message to provide an adjustable time delay for the UE's uplink transmission scheduled by the UL grant. Multiple RAR transmissions can schedule a single UL transmission at a specific time instance or different UL transmissions at different time intervals. The UE may report to the base station the best DL RAR transmission detected by the UE.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: November 24, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Johan Furuskog, Henrik Sahlin, Andreas Bergström, Håkan Andersson, Niclas Wiberg, Qiang Zhang
  • Random access preamble receiver
    Patent number: 10834762
    Abstract: Systems and methods for processing a Random Access (RA) transmission are disclosed. In some embodiments, a method of operating a radio access node in a cellular communications network includes receiving an RA transmission from a wireless device. The method also includes detecting an RA preamble in the RA transmission from the wireless device and estimating a timing parameter of the wireless device using the RA transmission from the wireless device separately from detecting the RA preamble. By estimating the timing parameter separately from detecting the RA preamble, increased detection of the RA preamble is possible while also increasing the precision of the timing parameter estimate. In some embodiments, this separation also enables a complexity reduction of the receiver if a low complexity detector is used first and then the high complexity timing estimator is only used when an RA preamble is detected.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: November 10, 2020
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventor: Henrik Sahlin
  • Methods and Apparatus for Scheduling in Uplink
    Publication number: 20200351920
    Abstract: It is presented a method performed by a network node of a wireless communication network for scheduling a wireless device in uplink. An uplink signal structure is configured to be used by the wireless device and the network node, wherein the uplink signal structure defines transmission subframes divided into symbol periods. The network node applies a short Transmission Time Interval, sTTI, scheduling interval, wherein each sTTI is shorter in time than a subframe and each sTTI comprises at least one symbol period. The method comprises: transmitting a control information message to the wireless device for an sTTI scheduling interval, the control information message comprising uplink scheduling information assigned to the wireless device, the uplink scheduling information indicating a position and a length for at least one of a reference signal and data in the uplink sTTI.
    Type: Application
    Filed: July 17, 2020
    Publication date: November 5, 2020
    Inventors: Henrik Sahlin, Jingya Li, Helka-Liina Määttanen, Ying Sun, Gustav Wikström
  • Subframe selection for introducing short TTIs in TDD
    Patent number: 10827384
    Abstract: Systems and methods are disclosed that relate to selecting Time Division Duplexing (TDD) subframes (SFs) where both downlink (DL) and uplink (UL) short Transmit Time Intervals (sTTIs) can be introduced without substantially affecting legacy TDD operations. In this regard, in some embodiments, a method of operation of a network node of a cellular communications network comprises partitioning a plurality of SFs into at least two sets of SFs. The at least two sets of SFs comprising a first set of SFs for legacy TDD transmissions and a second set of SFs for sTTI TDD transmissions. The method further comprises performing one or more telecommunications functions according to the at least two sets of SFs. In this manner, TDD sTTI transmissions can be performed without substantially affecting legacy TDD operations.
    Type: Grant
    Filed: May 12, 2017
    Date of Patent: November 3, 2020
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Jingya Li, Henrik Sahlin, Mattias Andersson, Gustav Wikström, Niklas Andgart
  • Method and Apparatuses for Operating a Wireless Communication Network
    Publication number: 20200337071
    Abstract: A method for operating a wireless communication network, wherein a first member of the network transmits a scheduling message to a secondary member of the network and the secondary member receives the scheduling message. The secondary member schedules sounding signal transmissions and/or a corresponding schedule based on the scheduling message, wherein the scheduling message and/or the sounding signal schedule refers to a schedule for sounding signals based on a status of beam forming performed in the network and/or wherein the sounding signal schedule and/or the schedule message refers to a compact schedule of sounding signals.
    Type: Application
    Filed: July 8, 2020
    Publication date: October 22, 2020
    Inventors: Håkan Andersson, Mattias Frenne, Johan Furuskog, Stefan Parkvall, Henrik Sahlin, Qiang Zhang