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).

  • Publication number: 20210377878
    Abstract: Methods, apparatus and device-readable mediums are disclosed relating to wireless access in a network requiring a carrier-sense mechanism. One aspect provides a method performed by a transmitting device for transmitting to a receiving device in a 10 wireless communications network. The transmitting device comprises a plurality of antenna elements. The method comprises: performing a directional carrier-sense assessment for one or more sub-bands configured for transmissions between the transmitting device and the receiving device, the directional carrier-sense assessment utilizing beamforming to detect a respective level of wireless activity on each of the sub-15 bands in a particular direction for transmissions to the receiving device; selecting a respective transmit power for each sub-band based on the determined level of wireless activity; and transmitting to the receiving device in the particular direction, using the respective selected transmit power for each sub-band.
    Type: Application
    Filed: October 24, 2018
    Publication date: December 2, 2021
    Inventors: Dennis Sundman, Mehmet Burak Guldogan, Miguel Lopez, Leif Wilhelmsson
  • Publication number: 20210351964
    Abstract: A method and transmitter for transmitting an On-Off Keying, OOK, signal which comprises an ON waveform and an OFF waveform forming a pattern representing transmitted binary information as a Manchester code. For one binary value of information to be transmitted, a first set of complex-valued frequency domain symbols is provided to an inverse fast Fourier transformer, or for the other binary value of information to be transmitted, a second set of complex-valued frequency domain symbols is provided to the inverse fast Fourier transformer. The inverse fast Fourier transform is performed to form an orthogonal frequency division multiplex, OFDM representation, including a cyclic prefix, of the OOK signal of information to be transmitted. The OFDM representation is then transmitted.
    Type: Application
    Filed: October 15, 2018
    Publication date: November 11, 2021
    Inventors: Miguel Lopez, Leif Wilhelmsson
  • Patent number: 11165619
    Abstract: A link adaptation method is disclosed of a network node adapted to operate in concurrent association with one or more orthogonal frequency division multiple access (OFDMA) wireless communication devices using OFDMA signaling, and a non-OFDMA wireless communication device using non-OFDMA signaling. The non-OFDMA signaling has a bandwidth that is smaller than a maximum bandwidth of the OFDMA signaling. The method comprises excluding one or more sub-carriers from the OFDMA signaling to create a frequency gap and determining a center frequency of the non-OFDMA signaling such that the center frequency is within the frequency gap. The method also comprises selecting a modulation and coding scheme to be used for the OFDMA signaling based on a first signal-to-interference value. In the first signal-to-interference value, the non-OFDMA signaling acts as interference to the OFDMA signaling. Corresponding computer program product, arrangement and network node are also disclosed.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: November 2, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Leif Wilhelmsson
  • Patent number: 11153907
    Abstract: A method and an access node of a wireless network, for controlling uplink transmissions from wireless devices. It is detected that both a Narrow Band wireless device capable of receiving signals on a first narrow bandwidth channel and one or more legacy wireless devices capable of receiving signals on a second broad bandwidth channel are present. The second broad channel covers the first narrow channel. When receiving an uplink transmission from the Narrow Band device that indicates pending uplink data, the access node performs a downlink transmission that both Narrow Band wireless devices and legacy wireless devices can receive and decode. The downlink transmission indicates that the Narrow Band wireless device is allowed to transmit its pending uplink data on allocated resources within the first bandwidth channel, and that the second bandwidth channel is occupied.
    Type: Grant
    Filed: November 18, 2016
    Date of Patent: October 19, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Parth Amin, Luis Felipe Del Carpio Vega, Yu Wang, Leif Wilhelmsson
  • Patent number: 11140630
    Abstract: A method is disclosed of a wireless communication node adapted to transmit a wake-up signal for waking up one or more wireless communication receivers. The method comprises determining a first set of data for concurrent transmission with the wake-up signal, and determining a first interference indicator value indicative of a level of interference caused by the first set of data to the wake-up signal due to concurrent transmission. The method also comprises deciding if the wake-up signal is to be concurrently transmitted with the first set of data based on the first interference indicator value, and transmitting the wake-up signal in accordance with the decision. Corresponding arrangement, wireless communication node and computer program product are also disclosed.
    Type: Grant
    Filed: January 9, 2018
    Date of Patent: October 5, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Miguel Lopez, Leif Wilhelmsson
  • Publication number: 20210297950
    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: Application
    Filed: July 12, 2018
    Publication date: September 23, 2021
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Dennis Sundman, Leif Wilhelmsson
  • Publication number: 20210289449
    Abstract: An aspect of the present disclosure is directed to a network node for performing communication in a wireless communication network. The network node is configured to receive a signal transmitted by a user device in the wireless communication network, measure a received power level at which the signal is received by the network node, determine, based on a predefined transmit power level of the network node, based on a predefined transmit power level of the user device and based on the received power level, a threshold power level for a clear channel assessment to be performed by the user device, and trigger transmitting an indication of the threshold power level to the user device. Further aspects of the disclosure pertain to a user device, methods and a computer program product.
    Type: Application
    Filed: June 2, 2021
    Publication date: September 16, 2021
    Inventors: Leif Wilhelmsson, Guido Roland Hiertz
  • Publication number: 20210266206
    Abstract: A method of a receiver is used for receiving an amplitude shift keyed signal provided over a multi-layered transmission from a plurality of antennas with different precoding of different symbols for the respective layers. The method comprises receiving a sequence of signal values of the signal, estimating, from the sequence of signal values, channels for the respective layers, and selecting one of a plurality of detection methods based on a difference in quality between the estimated channels A receiver and a computer program are also disclosed.
    Type: Application
    Filed: June 20, 2018
    Publication date: August 26, 2021
    Inventors: Leif Wilhelmsson, Erik G. Larsson, Emil Björnson
  • Publication number: 20210258196
    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: Application
    Filed: September 7, 2018
    Publication date: August 19, 2021
    Inventors: Miguel Lopez, Leif Wilhelmsson, Dennis Sundman
  • Publication number: 20210250211
    Abstract: In one example aspect, a method is provided of transmitting a plurality of data symbols. The method comprises transmitting a first on-off keyed signal corresponding to the data symbols, the first signal comprising a plurality of on periods and a plurality of off periods. Each on period comprises a first signal portion cyclically shifted within the on period by a respective random or pseudorandom factor.
    Type: Application
    Filed: June 25, 2018
    Publication date: August 12, 2021
    Inventors: Miguel Lopez, Dennis Sundman, Leif Wilhelmsson
  • Publication number: 20210250863
    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: Application
    Filed: April 29, 2021
    Publication date: August 12, 2021
    Inventors: Leif WILHELMSSON, Miguel LOPEZ, Thomas OLSSON
  • Patent number: 11076351
    Abstract: A method is disclosed of constructing a wake-up signal for waking up one or more of a plurality of wireless communication receivers, wherein each of the plurality of wireless communication receivers is adapted to receive in accordance with respective standard. The method comprises selecting a collection of sequences of symbols and dividing the collection of sequences into a plurality of groups, wherein all sequences of a group comprise a same first set of symbols. The method also comprises selecting one of the groups, and letting the first set of symbols of the selected group indicate one or more standards corresponding to the one or more of the wireless communication receivers to be woken up. The wake-up signal is then constructed based on a sequence of symbols of the selected group. The sequences of symbols of the collection may be of different lengths and the selected group may comprise sequences of symbols of different lengths.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: July 27, 2021
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (publ)
    Inventors: Leif Wilhelmsson, Miguel Lopez, Thomas Olsson
  • Publication number: 20210226828
    Abstract: A transmitter is arranged to transmit binary information using a binary amplitude shift keying where information symbols are represented by a signal including a first power state and a second power state. The first power state has a higher signal power than the second power state. A ratio in powers between the first and second power states is below a first value. The ratio in powers between the first and second power states is above a second value such that the states are distinguishably decodable. A network node having such a transmitter, a corresponding method, and a computer program for implementing the method in a transmitter are also disclosed.
    Type: Application
    Filed: September 26, 2018
    Publication date: July 22, 2021
    Inventors: Leif WILHELMSSON, Luis Felipe DEL CARPIO VEGA, Rocco DI TARANTO, Miguel LOPEZ, Divya PEDDIREDDY, Dennis SUNDMAN
  • Patent number: 11070414
    Abstract: A wireless communication node (300) and method therein for generating multicarrier signals by means of backscattering in a wireless communication system (100) are disclosed. The wireless communication node (300) comprises a plurality A of antennas (310) configured to receive a radio frequency. The wireless communication node (300) further comprises a plurality A of switches (320), each switch has a number M of states. The wireless communication node (300) further comprises a number of impedance matrices (330), each impedance matrix comprising a number M of impedances (Z1, Z2 . . . ), each antenna is coupled to one of the impedance matrices (330) by one of the plurality A switches (320). The wireless communication node (300) further comprises a symbol mapper, a serial to parallel converter and one or more modulators (340) configured to generate a number A of baseband subcarrier signals based on data symbols (342) to be transmitted.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: July 20, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Miguel Lopez, Thomas Olsson, Leif Wilhelmsson
  • Patent number: 11063797
    Abstract: A transmitter is arranged to transmit binary information using a binary amplitude shift keying where information symbols are represented by a signal including a first power state and a second power state. A duration of a bit includes a first part where the second power state is applied irrespective of which binary value being represented, and a second part where a binary value is represented by any of the first power and a third power state or a combination pattern of the first power state and the third power state. The first power state has a higher signal power than the second power state and the third power state. The duration of the second part is equal or less the duration of the first part and the signal power of the first power state is such that the binary values are distinguishably decodable.
    Type: Grant
    Filed: September 26, 2018
    Date of Patent: July 13, 2021
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Leif Wilhelmsson, Miguel Lopez, Dennis Sundman
  • Publication number: 20210211165
    Abstract: A method of transmitting an amplitude shift keyed signal uses a multi-layered transmission over a plurality of transmit antennas with different precoding of different symbols for the respective layers. The method comprises obtaining a sequence of bits to be conveyed, keying the sequence of bits to a signal, precoding the signal to respective layer, and transmitting the precoded signal. A transmitter for transmitting the amplitude shift keyed signal, and a computer program for implementing the method are also disclosed.
    Type: Application
    Filed: June 20, 2018
    Publication date: July 8, 2021
    Inventors: Leif Wilhelmsson, Erik G. Larsson, Emil Björnson
  • Patent number: 11057844
    Abstract: An aspect of the present disclosure is directed to a network node for performing communication in a wireless communication network. The network node is configured to receive a signal transmitted by a user device in the wireless communication network, measure a received power level at which the signal is received by the network node, determine, based on a predefined transmit power level of the network node, based on a predefined transmit power level of the user device and based on the received power level, a threshold power level for a clear channel assessment to be performed by the user device, and trigger transmitting an indication of the threshold power level to the user device. Further aspects of the disclosure pertain to a user device, methods and a computer program product.
    Type: Grant
    Filed: December 18, 2019
    Date of Patent: July 6, 2021
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Leif Wilhelmsson, Guido Roland Hiertz
  • Patent number: 11051249
    Abstract: A method of a network node is disclosed. The method is for concurrently transmitting two or more wake-up signals (WUS) using an signal generator applying an signal generator symbol rate, wherein each WUS is for reception by a wake-up receiver (WUR) of a respective wireless communication device. The method comprises selecting a respective Manchester coding symbol rate for each of the two or more WUS, wherein all of the selected respective Manchester coding symbol rates are different from each other, and wherein all Manchester codes having the selected respective Manchester coding symbol rates are orthogonal to each other. The method also comprises generating each of the two or more WUS using the signal generator and application of a Manchester code of the selected respective Manchester coding symbol rate, and multiplexing the two or more WUS for transmission in a WUS message.
    Type: Grant
    Filed: August 23, 2018
    Date of Patent: June 29, 2021
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Leif Wilhelmsson, Miguel Lopez, Dennis Sundman
  • Publication number: 20210195611
    Abstract: Embodiments include methods for an access point to schedule wireless communication devices. Such methods include performing link adaptation by assigning respective modulation and coding schemes (MCS) for the wireless communication devices. Each assigned MCS is associated with a corresponding power back-off. Such methods include scheduling the wireless communication devices on transmission resources based on assignment of the wireless communications devices into two or more groups. Each group is scheduled on different transmission resources than used to schedule other groups. First wireless communication devices assigned a first MCS and a first power back-off are assigned to a first group. Second wireless communications devices assigned a second MCS and a second power back-off, and that meet a grouping criterion associated with the first power back-off, are assigned to the first group until a maximum size for the first group is reached.
    Type: Application
    Filed: March 9, 2021
    Publication date: June 24, 2021
    Inventors: Thomas Nilsson, Rocco Di Taranto, Leif Wilhelmsson
  • Patent number: 11038571
    Abstract: A wireless communication node and method therein for generating beamformed signals by means of backscattering in a wireless communication network are disclosed. The wireless communication node receives a radio frequency signal at a plurality A of antennas. Each antenna is coupled to one of a number of impedance matrices by one of a plurality A of switches. The wireless communication node generates a first baseband signal based on data symbols to be transmitted in a baseband signal generator. The states of each switch are controlled based on its specific switch control signal such that each antenna impedance is selected among a number M of impedances, and thereby the received RF signal at each antenna is modulated by the first baseband signal with its specific phase and reflected. The beamformed signals are generated by the plurality A of antennas by reflecting the modulated RF signals from each antenna.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: June 15, 2021
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (publ)
    Inventors: Miguel Lopez, Thomas Olsson, Leif Wilhelmsson