Patents by Inventor Per-Erik Eriksson

Per-Erik Eriksson 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: 10820322
    Abstract: It is provided a method for reducing bit rate requirement over an uplink fronthaul link. The method is performed in a fronthaul transmitter of a radio network node and comprises the steps of: determining a group of frequency-domain resource elements having been received over a wireless channel (40); estimating channel information (42); reducing a number of bits for representing the respective frequency-domain resource element, to thereby obtain a modified resource element (44); transmitting the modified resource elements of the group over the fronthaul link to a fronthaul receiver (46); and transmitting compression metadata (48), indicating how the reduction was performed, over the fronthaul link to the fronthaul receiver which performs the steps of receiving the modified resource elements (50), receiving the compression metadata (52) and expanding the resource elements to increase the number of bits for representing the frequency-domain resource elements (54).
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: October 27, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Miguel Berg, Chenguang Lu, Daniel Cederholm, Per-Erik Eriksson
  • Patent number: 10756875
    Abstract: A method is disclosed performed by a base unit, of a base station system of a wireless communication network. The base station system further comprises a remote unit connected via a wired transmission line to the base unit, the remote unit being arranged for transmitting signals wirelessly to a wireless communication device. The method comprises modulating received Media Access Control, MAC, data packets onto a plurality of sub-frequency bands of a frequency band of the transmission line, and transmitting, to the remote unit, the modulated MAC data packets over the transmission line. Further, a corresponding method performed by a remote unit is disclosed.
    Type: Grant
    Filed: March 23, 2016
    Date of Patent: August 25, 2020
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Fredrik Lindqvist, Per-Erik Eriksson
  • Publication number: 20200236592
    Abstract: A method and transition device for enabling communication of data between a remote radio unit and a central baseband unit in a wireless network. When detecting a first interface configuration used by the remote radio unit and a second interface configuration used by the baseband unit, the transition device configures interface functions, based on the first and second interface configurations. The interface functions are selected from a set of predefined interface functions associated with different interface configurations. The transition device then establishes a data flow between the remote radio unit and the central baseband unit over the transition device, and performs conversion between the first interface configuration and the second interface configuration for data communicated in the data flow, using the selected interface functions.
    Type: Application
    Filed: August 17, 2017
    Publication date: July 23, 2020
    Inventors: Miguel BERG, Per-Erik ERIKSSON, Chenguang LU, Jacob ÖSTERLING, Elmar TROJER
  • Publication number: 20200205231
    Abstract: Disclosed is a method performed by an IRU (210) of abase station system (200), the base station system comprising the IRU (210), a BBU (230) connected to the IRU (210), and a first RH (221) connected to the IRU (210) via a packet data network (240). The first RH (221) is arranged for wireless transmission in RF of a plurality of antenna carriers to UEs (250). The method comprises receiving, from the BBU (230), a plurality of first digital representations of the plurality of antenna carriers of the first RH (221), each first digital representation representing one antenna carrier, the plurality of first digital representations being received in a baseband frequency range, frequency multiplexing the plurality of first digital representations of the plurality of antenna carriers into a second digital representation over a first bandwidth, and transmitting the second digital representation to the first RH (221).
    Type: Application
    Filed: August 31, 2017
    Publication date: June 25, 2020
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Elmar TROJER, Miguel BERG, Per-Erik ERIKSSON, Aldebaro KLAUTAU, Chenguang LU, Leonardo RAMALHO, Marcos TAKEDA
  • Publication number: 20200084688
    Abstract: Exemplary embodiments include methods and/or procedures performed by a first intermediate node of a multi-hop, integrated access backhaul communication network. Embodiments include receiving a data packet destined for a target node of the communication network, the first intermediate node being configured to communicate with the target node via a second intermediate node of the network. Embodiments include determining an address for the data packet based on a mapping function associated with the target node, and forming a packet header, including the previously-determined address, for the data packet. Forming the packet header can include at least one of the following operations: excluding one or more higher-layer protocol headers related to the second intermediate node; and incorporating without modification a portion, associated with the target node, of an existing header of the data packet.
    Type: Application
    Filed: December 19, 2018
    Publication date: March 12, 2020
    Inventors: Gunnar Mildh, Per-Erik Eriksson, Oumer Teyeb
  • Publication number: 20200084618
    Abstract: Exemplary embodiments include methods and/or procedures for Packet Data Convergence Protocol, PDCP, processing performed in a network node of a multi-hop, integrated access backhaul, IAB, communication network. Exemplary methods can include receiving (610) a configuration that includes a first characteristic associated with at least one of the following: the node and data packets received by the network node. Exemplary methods can also include receiving (620) a data packet having one or more packet characteristics, and determining (630) if there is a match between the one or more packet characteristics and the first characteristic. Exemplary methods can also include enabling or disabling (640) a first PDCP processing operation on the data packet based on the result of the determination. Other exemplary embodiments include network nodes configured and/or arranged to perform operations corresponding to the exemplary methods and/or procedures.
    Type: Application
    Filed: December 12, 2018
    Publication date: March 12, 2020
    Inventors: Oumer Teyeb, Per-Erik Eriksson, Gunnar Mildh
  • Publication number: 20200028639
    Abstract: A method is disclosed performed by a base unit (230), of a base station system (200) of a wireless communication network. The base station system further comprises a remote unit (220) connected via a wired transmission line (225) to the base unit (230), the remote unit (220) being arranged for transmitting signals wirelessly to a wireless communication device (240). The method comprises modulating received Media Access Control, MAC, data packets onto a plurality of sub-frequency bands of a frequency band of the transmission line, and transmitting, to the remote unit, the modulated MAC data packets over the transmission line. Further, a corresponding method performed by a remote unit is disclosed.
    Type: Application
    Filed: March 23, 2016
    Publication date: January 23, 2020
    Inventors: Fredrik LINDQVIST, Per-Erik ERIKSSON
  • Patent number: 10484045
    Abstract: It is presented a method for testing a cable connectable to a remote radio head. The method is performed in a test device and comprises the steps of: generating an outbound test container, the outbound test container comprising digital samples representing a test signal; transmitting the outbound test container and a frequency parameter indicating a frequency on which the test signal is to be transmitted to a converter device being connectable to a plurality of remote radio heads via respective cables, for transmission by the converter device; receiving an inbound test container, the inbound test container comprising digital samples of a response signal received by the converter device based on the outbound test container; and evaluating the inbound test container.
    Type: Grant
    Filed: November 25, 2014
    Date of Patent: November 19, 2019
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Elmar Trojer, Sándor Albrecht, Miguel Berg, Per-Erik Eriksson, Chenguang Lu
  • Patent number: 10382156
    Abstract: It is provided a method for reducing interference. The method is performed in a receiver and comprises the steps of: receiving a first signal forming part of a symbol; extracting a differential signal by comparing the first signal with a second signal, wherein the first signal and the second signal are based on the same information; estimating a base frequency of the differential signal for the symbol; mapping the base frequency to a first time of the symbol; estimating frequencies at other times of the symbol using interpolation and/or extrapolation using base frequencies from at least one adjacent symbol; reconstructing an interfering signal based on the estimated frequencies; and subtracting the reconstructed interfering signal from a received signal for the symbol.
    Type: Grant
    Filed: October 8, 2015
    Date of Patent: August 13, 2019
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Elmar Trojer, Miguel Berg, Per-Erik Eriksson, Chenguang Lu
  • Patent number: 10277286
    Abstract: It is presented a method for determining a position of a wireless device, the method being performed in a network node connected to a plurality of remote radio head devices each comprising a first antenna device which can be used for a first MIMO, multiple input multiple output, stream and a second antenna device which can be used for a second MIMO stream. The method comprises the steps of: sending a first cell identifier for transmission on both the first antenna device and the second antenna device of each one of the remote radio head devices; sending a second cell identifier, for transmission on an antenna device of only a specific remote radio head device; receiving a measurement report from the wireless device associated with the second cell identifier; and determining a position of the wireless device based on the received measurement report.
    Type: Grant
    Filed: December 23, 2013
    Date of Patent: April 30, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Chenguang Lu, Miguel Berg, Elmar Trojer, Per-Erik Eriksson
  • Publication number: 20190124662
    Abstract: It is provided a method for reducing bit rate requirement over an uplink fronthaul link. The method is performed in a fronthaul transmitter of a radio network node and comprises the steps of: determining a group of frequency-domain resource elements having been received over a wireless channel (40); estimating channel information (42); reducing a number of bits for representing the respective frequency-domain resource element, to thereby obtain a modified resource element (44); transmitting the modified resource elements of the group over the fronthaul link to a fronthaul receiver (46); and transmitting compression metadata (48), indicating how the reduction was performed, over the fronthaul link to the fronthaul receiver which performs the steps of receiving the modified resource elements (50), receiving the compression metadata (52) and expanding the resource elements to increase the number of bits for representing the frequency-domain resource elements (54).
    Type: Application
    Filed: June 30, 2016
    Publication date: April 25, 2019
    Applicant: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Miguel Berg, Chenguang Lu, Daniel Cederholm, Per-Erik Eriksson
  • Patent number: 10165623
    Abstract: It is provided a splitter device comprising: a first trunk cable interface for connecting with a first aggregation node via a first trunk cable; a first radio head interface for connecting to a first remote radio head via a first distribution cable; a second radio head interface for connecting to a second remote radio head via a second distribution cable; a signal combiner and splitter connected to the first radio head interface and the second radio head interface; and a radio signal refresh unit provided between the first trunk cable interface and the signal combiner and splitter. The radio head interfaces comprise respective gain control units and uplink signal amplifiers, wherein a gain of the uplink signal amplifiers is adjusted based on a signal from the respective gain control unit.
    Type: Grant
    Filed: September 1, 2014
    Date of Patent: December 25, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Elmar Trojer, Miguel Berg, Per-Erik Eriksson, Chenguang Lu
  • Publication number: 20180294909
    Abstract: It is provided a method for reducing interference. The method is performed in a receiver and comprises the steps of: receiving a first signal forming part of a symbol; extracting a differential signal by comparing the first signal with a second signal, wherein the first signal and the second signal are based on the same information; estimating a base frequency of the differential signal for the symbol; mapping the base frequency to a first time of the symbol; estimating frequencies at other times of the symbol using interpolation and/or extrapolation using base frequencies from at least one adjacent symbol; reconstructing an interfering signal based on the estimated frequencies; and subtracting the reconstructed interfering signal from a received signal for the symbol.
    Type: Application
    Filed: October 8, 2015
    Publication date: October 11, 2018
    Inventors: Elmar TROJER, Miguel BERG, Per-Erik ERIKSSON, Chenguang LU
  • Patent number: 10080071
    Abstract: A central node for digital subscriber line access multiplex.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: September 18, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Per-Erik Eriksson, Miguel Berg, Chenguang Lu, Elmar Trojer
  • Patent number: 10057867
    Abstract: A method (100, 200) in a synchronization control unit is disclosed. The method enables synchronization of a plurality of distributed devices with a network and comprises the steps of receiving a wireless synchronization signal from a network node over a wireless channel (104, 204) and processing the received synchronization signal (108, 208). The method further comprises transmitting the processed synchronization signal to the plurality of distributed devices over a local connection which is different to the wireless channel over which the wireless synchronization channel is received (120, 220). Also disclosed are a synchronization control unit (300, 400) and a computer program product.
    Type: Grant
    Filed: August 14, 2014
    Date of Patent: August 21, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Stefano Ruffini, Per-Erik Eriksson, Zere Ghebretensaé, Ioanna Pappa
  • Patent number: 9948004
    Abstract: It is presented a hybrid coil circuit comprising: a transformer; a common mode choke, wherein all choke windings are magnetically coupled; an impedance matching device connected on a middle choke winding, the impedance matching device being connected to ground; a first port being provided between a first choke winding and the impedance matching device; a second port being provided between a third choke winding and the impedance matching device; a third port being provided between either end of a second transformer winding; a first inductor arranged between the impedance matching device and the first port; and a second inductor arranged between the impedance matching device and the second port, wherein the first inductor and the second inductor are magnetically coupled.
    Type: Grant
    Filed: July 1, 2014
    Date of Patent: April 17, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Elmar Trojer, Per-Erik Eriksson, Chenguang Lu, Lukas Sandström, Miguel Berg
  • Patent number: 9918327
    Abstract: A first network node of a cellular system is configured for communication with a second network node over a twisted pair wire. The first network node includes a receiver for receiving, over the twisted pair wire, an intermediate frequency signal from the second network node, which intermediate frequency signal has been converted from a high frequency signal having a frequency higher than the frequency of the intermediate frequency signal by the second network node, and a down-converter for converting the intermediate frequency signal to a low frequency signal having a frequency lower than the frequency of the intermediate frequency signal. The first network node also includes an up-converter for converting a received low frequency signal to an intermediate frequency signal having a frequency higher than the frequency of the low frequency signal.
    Type: Grant
    Filed: May 2, 2016
    Date of Patent: March 13, 2018
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Chenguang Lu, Elmar Trojer, Jacob Osterling, Miguel Berg, Per-Erik Eriksson, Ralf Bergqvist
  • Patent number: 9893762
    Abstract: Vector Control Entity and method therein for Disorderly Leaving Events, DLEs, causing Sudden Termination Change in a DSL system. The method comprises, when a DLE occurs on a line m in a vectored group of DSL lines, and the transmission on line m is, at least partly, continued: obtaining at least one error sample from CPEs connected to other lines in the vectored group of DSL lines, and calculating an estimate of the channel coefficients, H?, changed due to the DLE. The estimate is calculated based on the at least one error sample, and thus a channel estimate is provided. The method further comprises modifying a downstream precoder, based on the channel estimate, such that retraining of the other lines in the vectored group due to the DLE is avoided. The estimate of the channel coefficients is calculated based on the model H?=H+C?H.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: February 13, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Eduardo Lins de Medeiros, Per-Erik Eriksson, Yezi Huang, Chenguang Lu, Thomas Magesacher
  • Publication number: 20170353214
    Abstract: Disclosed is a method for mitigating crosstalk performed by a network node of a wireless communication network operable in a base station system of the wireless communication network, the base station system comprising an intermediate radio unit, IRU, a baseband unit, BBU, connected to the IRU and a plurality of radio heads, RHs, connected to the IRU via a plurality of metallic conductors.
    Type: Application
    Filed: February 11, 2015
    Publication date: December 7, 2017
    Inventors: Eduardo Lins de Medeiros, Per-Erik Eriksson, Yezi Huang, Chenguang Lu
  • Publication number: 20170317717
    Abstract: It is presented a method for testing a cable connectable to a remote radio head. The method is performed in a test device and comprises the steps of: generating an outbound test container, the outbound test container comprising digital samples representing a test signal; transmitting the outbound test container and a frequency parameter indicating a frequency on which the test signal is to be transmitted to a converter device being connectable to a plurality of remote radio heads via respective cables, for transmission by the converter device; receiving an inbound test container, the inbound test container comprising digital samples of a response signal received by the converter device based on the outbound test container; and evaluating the inbound test container.
    Type: Application
    Filed: November 25, 2014
    Publication date: November 2, 2017
    Inventors: Elmar TROJER, Sándor ALBRECHT, Miguel BERG, Per-Erik ERIKSSON, Chenguang LU