Patents by Inventor Leif Wilhelmsson

Leif Wilhelmsson 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: 11510145
    Abstract: A wake-up radio unit for a wireless communication device is disclosed, wherein the wireless communication device has a plurality of wireless communication receivers. The wake-up radio unit is adapted to wake up any of the plurality of wireless communication receivers by receiving a wake-up signal, selecting one or more of the plurality of wireless communication receivers based on the wake-up signal, and waking up the selected one or more wireless communication receiver. In some embodiments, wherein each of the plurality of wireless communication receivers is adapted to receive in accordance with respective standard, the wake-up signal may comprise a set of symbols selected from a collection of possible sets of symbols. Each such set of symbols may indicate, at least in part, one or more corresponding standards.
    Type: Grant
    Filed: April 29, 2021
    Date of Patent: November 22, 2022
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (publ)
    Inventors: Leif Wilhelmsson, Miguel Lopez, Thomas Olsson
  • Patent number: 11503541
    Abstract: A method of a network node adapted to transmit a wake-up signal for waking up one or more wireless communication receivers is disclosed, as well as a method for the wireless communication receiver, such network node and wireless communication receiver, and computer programs for implementing the methods. Each wireless communication receiver is comprised in a wireless communication device and is associated with a wake-up radio adapted to wake up the wireless communication receiver in response to detecting the wake-up signal. An indication of a maximum frequency error of the wake-up radio associated with the wireless communication receiver is acquired such that a non-data transmission bandwidth for exclusive use by the wake-up signal can be determined. The wake-up signal is transmitted over a wake-up signal transmission frequency interval having a wake-up signal transmission bandwidth, wherein the wake-up signal transmission bandwidth is less than, or equal to, the non-data transmission bandwidth.
    Type: Grant
    Filed: January 8, 2021
    Date of Patent: November 15, 2022
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Leif Wilhelmsson, Miguel Lopez
  • Patent number: 11490332
    Abstract: A method of wirelessly providing a multiplexed wake-up packet for waking up a plurality of wireless communication receivers from a low-power state to a normal state is provided. The multiplexed wake-up packet comprises a composite of individual wake-up packets, wherein each individual wake-up packet is addressed to one of the plurality of wireless communication receivers. The method comprises determining a number N of individual wake-up packets of the multiplexed wake-up packet, determining a time offset To(n) for each of the individual wake-up packets, where n=1 . . . N, generating the multiplexed wake-up packet as a time domain multiplexed signal comprising all the N individual wake-up packets with the time offsets To(n), and transmitting the multiplexed wake-up packet. A network node is arranged to perform the method.
    Type: Grant
    Filed: July 12, 2018
    Date of Patent: November 1, 2022
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Dennis Sundman, Leif Wilhelmsson
  • Publication number: 20220345348
    Abstract: Methods and apparatus are provided. In an example aspect, a method of transmitting a multicarrier symbol comprising a plurality of subcarriers simultaneously from a plurality of antennas is provided. Each subcarrier is associated with a respective orthogonal matrix. The method comprises transmitting the symbol from the plurality of antennas such that, for each antenna, the symbol transmitted from each subcarrier is multiplied by an element of a respective row of the matrix associated with the subcarrier, wherein the row is associated with the antenna The matrices are selected such that from each antenna, the symbol transmitted from at least one subcarrier is multiplied by a non-zero element, and the symbol transmitted from at least one other subcarrier is multiplied by a zero element.
    Type: Application
    Filed: September 16, 2019
    Publication date: October 27, 2022
    Inventors: Miguel Lopez, Leif Wilhelmsson
  • Publication number: 20220346143
    Abstract: A method is disclosed of a transmitter node comprising a plurality of antenna elements and configured for beam-in formed transmission in a wireless communication environment requiring clear channel assessment (CCA) before transmission. The in method comprises performing CCA measurements by measuring received energy of the plurality of antenna elements, taking a CCA decision based on the measured received energy of the plurality of antenna elements, transforming the measured received energy of in the plurality of antenna elements into measured received energy of a plurality of angular directions, and selecting transmission beam based on the measured received energy of the plurality of angular directions. The wireless communication environment requiring CCA before transmission typically uses an unlicensed frequency spectrum. Corresponding apparatus, transmitter node and computer program product are also disclosed.
    Type: Application
    Filed: September 16, 2019
    Publication date: October 27, 2022
    Inventors: Joao Vieira, Leif Wilhelmsson, Sina Maleki
  • Publication number: 20220338022
    Abstract: The invention relates to assigning a beam pattern with null-steering beamforming from a first radio network node. A method includes determining a direction to a neighbouring second radio network node, determining an indication on traffic load for the second radio network node, and determining, from the direction and traffic load, a direction for a null of the null-steering beamforming. A computer program and a radio network node are also disclosed.
    Type: Application
    Filed: September 6, 2019
    Publication date: October 20, 2022
    Inventors: Lakshmikanth GUNTUPALLI, Dennis SUNDMAN, Leif WILHELMSSON
  • Publication number: 20220329320
    Abstract: Methods, apparatus and non-transitory machine-readable mediums are provided for wireless communication in communication networks enabled for wireless light communication. In one embodiment, a method is performed in a node of a communication network. The method enables data communication to be established between a first wireless device and the communication network upon a wireless Light Communication (LC) link between the first wireless device and an LC-enabled Access Point (AP) of the communication network becoming unavailable. The method comprises: identifying a second wireless device for relaying data between the first wireless device and the communication network via a first communication link between the first wireless device and the second wireless device and a second communication link between the second wireless device and an AP of the communication network associated with the second wireless device.
    Type: Application
    Filed: June 24, 2019
    Publication date: October 13, 2022
    Inventors: Athanasios Stavridis, Leif Wilhelmsson, Miguel Lopez
  • Publication number: 20220321215
    Abstract: Methods, apparatus and non-transitory machine-readable mediums are provided for wireless communication in communication networks comprising a wireless device, a radio access network node and a wireless light communication network node. In one embodiment, a method is performed by a node (102, 104, 120) of a wireless communication network (100), the wireless communication network comprising a wireless device (104), a radio access network node (102) and one or more wireless light communication (LC) network nodes (106). At least one of the wireless device and the radio access network node comprise a plurality of antenna elements configurable to provide a transmit or receive beam (110, 112) for communication with the other of the wireless device and the radio access network node.
    Type: Application
    Filed: June 24, 2019
    Publication date: October 6, 2022
    Inventors: Athanasios Stavridis, Miguel Lopez, Leif Wilhelmsson
  • Publication number: 20220302964
    Abstract: A method of a first access point and an access point arranged to provide wireless communication access for a wireless communication system are disclosed.
    Type: Application
    Filed: September 18, 2019
    Publication date: September 22, 2022
    Inventors: Leif Wilhelmsson, Lakshmikanth Guntupalli, Miguel Lopez, Dennis Sundman
  • Publication number: 20220295333
    Abstract: A wireless-local area network access point (101, 102; 800; 1100) sends at least one wake-up packet for activating broadcasting devices (21, 22, 23, 24) in vicinity of the wireless-local area network access point (101, 102; 800; 1100). In response to the at least one wake-up packet, the wireless-local area network access point (101, 102; 800; 1100) receives responses from the broadcasting devices (21, 22, 23, 24). Each response comprises an identifier of the broadcasting device (21, 22, 23, 24) sending the response. The at least one wake-up packet coordinates the sending of the responses by the broadcasting devices (21, 22, 23, 24) with respect to each other.
    Type: Application
    Filed: July 12, 2019
    Publication date: September 15, 2022
    Inventors: Miguel Lopez, Guido Roland Hiertz, Leif Wilhelmsson, Henrik Sjöland
  • Patent number: 11445442
    Abstract: In one aspect, a transmitting device may frequency-division multiplex a wake-up signature (WUS) targeted to a wake-up receiver (WUR) of a receiving device with user data targeted to a main transceiver of each of one or more other receiving devices into an output signal. The output signal is then transmitted. A receiving device having a WUR and a main transceiver of the receiving device detects, at the WUR, a WUS targeted for the WUR in a received signal. The WUS is frequency-division multiplexed with user data for one or more other receiving devices in the received signal. The receiving device wakes up the main transceiver in response to the detecting.
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: September 13, 2022
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Leif Wilhelmsson, Miguel Lopez, Sven Mattisson, Thomas Nilsson
  • Publication number: 20220286338
    Abstract: A packet format is disclosed for transmission of data packets over a communication channel, wherein transmission of one of the data packets utilizes a frequency bandwidth, and wherein the frequency bandwidth is dynamically variable between data packets. The packet format defines a frequency bandwidth detection field, wherein the frequency bandwidth detection field of a data packet has a first field content or a second field content, and wherein corresponding parts of the first and second field contents are orthogonal to each other. The first field content is indicative of that transmission of the data packet utilizes a first frequency bandwidth and the second field content is indicative of that transmission of the data packet utilizes a frequency bandwidth which is larger than the first frequency bandwidth. Corresponding methods and apparatuses for transmission/reception of data packets are also disclosed.
    Type: Application
    Filed: September 16, 2020
    Publication date: September 8, 2022
    Inventors: Miguel LOPEZ, Sebastian MAX, Leif WILHELMSSON, Dennis SUNDMAN
  • Patent number: 11431532
    Abstract: In one example aspect, a method of transmitting signals is provided. The method comprises transmitting a first multi-carrier on-off keyed signal comprising a plurality of on periods and a plurality of off periods. Transmitting the first signal in each on period comprises, for each subcarrier of a plurality of subcarriers, transmitting, from each antenna of a plurality of antennas, a frequency domain symbol associated with that subcarrier phase shifted by a respective factor of a set of factors associated with that subcarrier, wherein the set of factors associated with that subcarrier is different from the set of factors associated with at least one other subcarrier of the plurality of subcarriers.
    Type: Grant
    Filed: September 7, 2018
    Date of Patent: August 30, 2022
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Miguel Lopez, Leif Wilhelmsson, Dennis Sundman
  • Publication number: 20220271985
    Abstract: A method of signalling in a Wireless Local Area Network, WLAN, includes transmitting a signal having a physical layer data unit via a wireless channel of the WLAN using plural subcarriers spaced across plural symbols, the physical layer data unit having a data packet and a preamble, wherein the preamble has a synchronisation part having a channel estimation part. The channel estimation part has N training symbols, where N is an integer greater than 1, the N training symbols have synchronisation information for synchronising a second wireless device with the first wireless device, the synchronisation information having an offset value, and synchronisation information transmitted in second and subsequent training symbols is transmitted using offset subcarriers, the offset subcarriers being frequency offset with respect to reference subcarriers used to transmit synchronisation information in a first training symbol, the frequency offset being equal to the offset value.
    Type: Application
    Filed: July 10, 2020
    Publication date: August 25, 2022
    Inventors: Miguel LOPEZ, Leif WILHELMSSON
  • Publication number: 20220264458
    Abstract: A method for a wireless transmitter is disclosed. The method comprises transmitting a wake-up signal over a frequency range during a time interval by transmitting a first signal part over a first frequency interval within the frequency range during the time interval and transmitting a second signal part over a second frequency interval within the frequency range during the time interval. The first and second frequency intervals are non-overlapping. The first signal part has a first auto-correlation value, and the second signal part is specifically constructed to provide a second autocorrelation value of the signal comprising the first and second signal parts which is lower than the first auto-correlation value. The invention to solve the problem of false detection of an MC-OOK modulated wake-up signal in an IEEE 802.11 system using OFDM.
    Type: Application
    Filed: June 2, 2020
    Publication date: August 18, 2022
    Inventors: Miguel Lopez, Leif Wilhelmsson
  • Publication number: 20220256596
    Abstract: A method is performed by a wireless transmitting device for a communication network. The communication network implements a standard in which transmitting devices contend for access to a wireless transmission medium, a transmitting device being permitted to transmit using the wireless transmission medium for a window of time upon winning contention. The method includes initiating a first, initial transmission to one or more wireless receiving devices in the window of time, the first transmission including a first preamble; and, subsequent to the first transmission, initiating a second transmission to one or more wireless receiving devices in the window of time, the second transmission including a second preamble which is shorter than the first preamble, or including no preamble.
    Type: Application
    Filed: April 24, 2020
    Publication date: August 11, 2022
    Inventors: Sebastian MAX, Miguel LOPEZ, Dennis SUNDMAN, Leif WILHELMSSON
  • Publication number: 20220256460
    Abstract: A method for a wake-up transmitter comprises generating a wakeup signal (WUS) from a digital WUS sequence having an information symbol rate and a corresponding information symbol bandwidth, and transmitting the WUS over a frequency range having a signal bandwidth, wherein the signal bandwidth is larger than twice the information symbol rate, and wherein any frequency interval comprised in the frequency range conveys the digital WUS sequence when a width of the frequency interval is at least the information symbol bandwidth. A corresponding method for a wake-up receiver comprises receiving the WUS over the frequency range, and filtering the received WUS through a filter having a filter bandwidth for passing the information symbol bandwidth of the received WUS. Corresponding apparatuses, wake-up transmitter, wake-up receiver, communication device and computer program product are also disclosed.
    Type: Application
    Filed: July 5, 2019
    Publication date: August 11, 2022
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Henrik SJÖLAND, Leif WILHELMSSON
  • Publication number: 20220239439
    Abstract: A method for a primary wireless transmitter is disclosed. The primary wireless transmitter is configured to participate in transmission to a wireless receiver using spatial multiplexing in coordination with one or more secondary wireless transmitters. The method comprises assigning—from a collection of available channel sounding resources—respective channel sounding resources to the primary wireless transmitter and to the one or more secondary wireless transmitters, wherein each available channel sounding resource is assigned to at most one of the wireless transmitters. Each assigned respective channel sounding resource is for transmission of a respective non-spatial-multiplexed first channel sounding signal, and the first channel sounding signals are for phase tracking of signals transmitted by the primary wireless transmitter and/or for phase tracking of signals transmitted by the one or more secondary wireless transmitters.
    Type: Application
    Filed: May 9, 2019
    Publication date: July 28, 2022
    Inventors: Miguel Lopez, Leif Wilhelmsson, Dennis Sundman
  • Publication number: 20220231731
    Abstract: A method is performed by a network node of a communication network. The communication network comprises a plurality of coordinated radio access network nodes for transmitting multiple streams of data to a wireless device in a given time resource. The method comprises: causing transmission, to the wireless device, of an indication that the wireless device should perform multiple separate phase-tracking processes on the signals received from the plurality of coordinated radio access network nodes in the given time resource.
    Type: Application
    Filed: May 9, 2019
    Publication date: July 21, 2022
    Inventors: Miguel Lopez, Leif Wilhelmsson, Dennis Sundman
  • Publication number: 20220232449
    Abstract: A method of waking up a mesh node in a wireless mesh network, wherein said mesh node comprises a main receiver and a wakeup receiver, and wherein said method comprises the steps of receiving, by said wakeup receiver of said mesh node, a wake up signal message, wherein said wake up signal message comprises context information which is related to a path between a source mesh node and a destination mesh node corresponding to said wake up signal message, determining, by said wakeup receiver of said mesh node, that said context information is applicable for said mesh node, activating, by said wakeup receiver of said mesh node, said main receiver of said mesh node for subsequently receiving a data message.
    Type: Application
    Filed: June 11, 2019
    Publication date: July 21, 2022
    Inventors: Piergiuseppe Di Marco, Per Skillermark, Leif Wilhelmsson, Magnus L. Olsson