Patents by Inventor Erik Dahlman

Erik Dahlman 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: 10034230
    Abstract: It is disclosed a wireless device (302, 90, 100), a radio network node (304, 70, 80) and methods therefore, for communicating in a network. The wireless device is configured to determine (52, 306) one or more possible first sequences of a discovery signal. The wireless device is configured to receive (54, 310) a second sequence of the discovery signal, and to determine (56, 312) if the one or more possible first sequences match the second sequence.
    Type: Grant
    Filed: January 7, 2014
    Date of Patent: July 24, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Stefan Parkvall, Erik Dahlman
  • Publication number: 20180199341
    Abstract: Techniques are disclosed for allocating time-frequency resources in a system that uses multiple multicarrier modulation numerologies. According to one aspect, a method in a first wireless node comprises allocating (1310) time-frequency resources for use by a second wireless node, where said allocating comprises selecting, for use in multicarrier modulation in the allocated time-frequency resources, one of two or more subcarrier bandwidths that the second wireless node is adapted to use for modulating or de modulating of data. In some embodiments, the method further comprises sending (1320) resource allocation information to the second wireless node, the resource allocation information identifying the allocated time-frequency resources.
    Type: Application
    Filed: July 6, 2015
    Publication date: July 12, 2018
    Inventors: Robert Baldemair, Håkan Björkegren, Erik Dahlman, Stefan Parkvall, Karl Werner
  • Publication number: 20180131480
    Abstract: The present invention relates to cellular radio communication and in particular to providing information on neighbour cells to enable terminals to perform neighbour cell measurements. In the prior art the terminal attempts to make neighbour cell measurements in a reference signal structure that is the same in the neighbour cell as in the cell the terminal camps in. The present invention is based on the insight that the reference signal structure may differ between neighbouring cell for example in the situation of an MBSFN area that is restricted to a region of all cells of a radio network, or in the situation of TDD mode being applied there may be different regions with different allocation of sub-frames for transmission in the uplink and downlink directions. The present invention solves the problem by broadcast information in a cell indicative of the reference signal structure in neighbour cells.
    Type: Application
    Filed: January 8, 2018
    Publication date: May 10, 2018
    Inventors: Stefan Parkvall, David Astely, Erik Dahlman
  • Publication number: 20180110013
    Abstract: A UE and a method performed by the UE for power control of uplink transmissions, when the UE is connected in dual connectivity mode to at least a first network node and a second network node are provided. The method comprises determining (210) to perform a first uplink transmission to the first network node and a second uplink transmission to the second network node, the uplink transmissions to be performed simultaneously. The method also comprises determining (220) a respective first and second uplink transmission power for the first and second uplink transmission; and transmitting (240) the first and the second uplink transmissions at the first and the second uplink transmission power respectively when the sum of the first and second uplink transmission power is below a maximum transmission power.
    Type: Application
    Filed: December 7, 2017
    Publication date: April 19, 2018
    Inventors: Eliane Semaan, Erik Dahlman, David Hammarwall, Shaohua Li, Imadur Rahman, Xinghua Song
  • Publication number: 20180109355
    Abstract: A first communication node (110) receives a stream of code blocks from a second communication node (120) over an acknowledged connection (131.). The first communication node processes the received code blocks in accordance with at least one transport format parameter, TFP, detects errors in received code blocks, and transmits an acknowledgment in respect of groups of code blocks indicating whether at least one error was detected in the group. A first subset of the code blocks of a group are transmitted (e.g., modulated and demodulated) in accordance with a first TFP value, and a remainder of the code blocks are transmitted in accordance with a second TFP value. Because the first and second TFP values are independent, it is possible either to shorten the necessary processing time in the first communication node or, in connection with a predictive acknowledgment mechanism, to make the receiving-side processing of code blocks that do not contribute to the value of the transmitted acknowledgment more robust.
    Type: Application
    Filed: May 3, 2016
    Publication date: April 19, 2018
    Inventors: Karl Werner, Robert Baldemair, Håkan Björkegren, Erik Dahlman, Stefan Parkvall
  • Patent number: 9949273
    Abstract: It is presented a method performed in a first network node. The method comprises the steps of: receiving an uplink transmission from a mobile communication terminal; determining, based on content of the uplink transmission, information to be transmitted over a first communication channel when the content comprises control data intended for a second network node; transmitting the information over the first communication channel to the second network node when the information is to be transmitted over the first communication channel; and transmitting the information via a second communication channel, the second communication channel being physically separate from the first communication channel, when the information is not to be transmitted over the first communication channel. A corresponding network node is also presented.
    Type: Grant
    Filed: July 4, 2012
    Date of Patent: April 17, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Erik Dahlman, David Astely, Stefan Parkvall
  • Patent number: 9949239
    Abstract: The technology described in this case facilitates random access by a user terminal with a radio base station. A user terminal determines one of a first type of uplink scrambling sequences and generates a random access message using the determined one of the first type of uplink scrambling sequences. The random access message is transmitted to the base station. The user terminal receives from the base station a second, different type of uplink scrambling sequence and uses it for subsequent communication with the radio base station. For example, the first uplink scrambling sequences may be specifically associated with the radio base station's cell area or a random access radio channel associated with the radio base station, but they are not specifically assigned to any user terminal, and the second uplink scrambling sequence may be selected from a second set of uplink scrambling sequences specifically assignable to individual user terminals.
    Type: Grant
    Filed: April 3, 2014
    Date of Patent: April 17, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Stefan Parkvall, Erik Dahlman, Tobias Tynderfeldt
  • Patent number: 9935749
    Abstract: A set of different pilot structures are designed for use in different environments and/or different user behaviors that are expected to occur in a cell. The radio conditions for a user are estimated. Each user is then assigned an area (108A-E) in resource space for its communication, which has a suitable pilot configuration. In one embodiment, the entire resource space is provided with different pilot structures in different parts (110A-D) In advance and allocation of resources to the users are then performed in order to match estimated radio conditions to the provided pilot structure. In another embodiment, allocation is performed first, and then the actual pilot structure is adapted within the allocated resource space area to suit the environmental conditions.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: April 3, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Johan Nyström, Pàl Frenger, Erik Dahlman, Svante Signell, Göran Klang
  • Patent number: 9912372
    Abstract: Variable bandwidth assignment and frequency hopping are employed to make efficient use of radio resources. Variable bandwidth assignment is achieved by dynamically allocating different numbers of subcarriers to different wireless communication devices depending on their instantaneous channel conditions. The frequency hopping patterns are determined “on-the-fly” based on the current bandwidth assignments. The bandwidth assignments and frequency hopping patterns are signaled to the wireless communication devices in a scheduling grant.
    Type: Grant
    Filed: March 21, 2016
    Date of Patent: March 6, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Erik Dahlman, Ylva Jading, Per Skillermark, Stefan Parkvall
  • Patent number: 9912453
    Abstract: A first User Equipment (UE), a second UE, a first Radio Network Node (RNN), and methods therein for controlling interference between transmissions in a first system and transmissions in a second system. The first system comprises the first UE and the first RNN serving the first UE. The second system comprises the second UE and a second RNN serving the second UE. The first system has a first priority in a first part of a shared spectrum and the second system has a second priority in the first part of the shared spectrum, wherein the first priority is higher than the second priority. The method in the first UE comprises transmitting a signal to a second RNN that is to perform a downlink transmission to the second UE, which signal is configured to control the transmission of the second RNN.
    Type: Grant
    Filed: October 14, 2016
    Date of Patent: March 6, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (publ)
    Inventors: Erik Dahlman, Magnus Frodigh, Anders Furuskar, Niklas Johansson, Stefan Parkvall
  • Patent number: 9900136
    Abstract: The present invention relates to cellular radio communication and in particular to providing information on neighbor cells to enable terminals to perform neighbor cell measurements. In the prior art the terminal attempts to make neighbor cell measurements in a reference signal structure that is the same in the neighbor cell as in the cell the terminal camps in. The present invention is based on the insight that the reference signal structure may differ between neighboring cell for example in the situation of an MBSFN area that is restricted to a region of all cells of a radio network, or in the situation of TDD mode being applied there may be different regions with different allocation of sub-frames for transmission in the uplink and downlink directions. The present invention solves the problem by broadcast information in a cell indicative of the reference signal structure in neighbor cells.
    Type: Grant
    Filed: October 24, 2014
    Date of Patent: February 20, 2018
    Assignee: Optis Wireless Technology, LLC
    Inventors: Stefan Parkvall, David Astely, Erik Dahlman
  • Publication number: 20180041311
    Abstract: A method implemented in a first communication node (110) for communicating with a second communication node (120) over an acknowledged connection (131), comprising: receiving a stream of code blocks from the second communication node, wherein each code block is associated with a check value enabling error detection and belongs to a predefined group of code blocks; detecting errors in received code blocks using respective associated check values; and transmitting to the second communication node an acknowledgement in respect of each of said predefined groups of code blocks, wherein a negative value of the acknowledgment signifies that an error was detected for at least one of the code blocks in the predefined group, wherein the acknowledgement for a predefined group of two or more code blocks is based on a combination of error detection results for a subset of the code blocks in the predefined group.
    Type: Application
    Filed: February 26, 2016
    Publication date: February 8, 2018
    Inventors: Karl Werner, Robert Baldemair, Håkan Björkegren, Erik Dahlman, Stefan Parkvall
  • Patent number: 9883463
    Abstract: A first user equipment transmits a beacon signal to be detected by at least one second user equipment for Device-to-Device, D2D, communication in a wireless telecommunications network. The first user equipment transmits the beacon signal in transmission bursts with a first energy level, where the transmission bursts are transmitted continually over time in order to enable detection of the beacon signal by the at least one second user equipment. The first user equipment then increases the energy of the transmission bursts at one or more intervals to a second energy level such that transmission bursts with the first energy level is alternated with transmission bursts with the second energy level, and such that transmission bursts with the first energy level recur more frequently over time than transmission bursts with a second energy level. A user equipment, a network node and a method in the network node are also provided.
    Type: Grant
    Filed: October 1, 2012
    Date of Patent: January 30, 2018
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Erik Dahlman, Stefan Parkvall, Gabor Fodor, Leif Wilhelmsson, Göran N. Klang
  • Patent number: 9883324
    Abstract: The embodiments herein relate to a method in a first device (101) for informing a second device (105) that an identity associated with the first device (101) is at a certain location. The first device (101) obtains information about the location of the first device (101). The first device (101) broadcasts, by means of device to device, D2D, communication, a message to be received by the second device (105). The message comprises the location information and an identity information associated with a user of the first device (101). The location information is transmitted on a first communications resource and the identity information is transmitted on a second communications resource.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: January 30, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Yngve Selén, Erik Dahlman, Stefan Parkvall, Markus Ringström
  • Patent number: 9872256
    Abstract: A User Equipment (UE) and a method performed by the UE for power control of uplink transmissions, when the UE is connected in dual connectivity mode to at least a first network node and a second network node are provided. The method comprises determining to perform a first uplink transmission to the first network node and a second uplink transmission to the second network node, the uplink transmissions to be performed simultaneously. The method also comprises determining a respective first and second uplink transmission power for the first and the second uplink transmission; and transmitting the first and the second uplink transmissions at the first and the second uplink transmission power respectively when the sum of the first and second uplink transmission power is below a maximum transmission power.
    Type: Grant
    Filed: July 15, 2013
    Date of Patent: January 16, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Eliane Semaan, Erik Dahlman, David Hammarwall, Shaohua Li, Imadur Rahman, Xinghua Song
  • Patent number: 9860929
    Abstract: A method in a first user equipment for adjusting a beacon signal to be detected by at least one second user equipment in a wireless telecommunications network is provided. The beacon signal is transmitted in order to enable an establishment of Device-to-Device, D2D, communication between the first user equipment and the at least one second user equipment. The method is characterized in that the method comprises adjusting, prior to transmitting the beacon signal, the transmit power of the beacon signal based on a requirement of an application in the first user equipment for which the D2D communication is to be established. A user equipment, a network node, and a method in a network node for enabling a D2D communication between a first user equipment and at least one second user equipment are also provided.
    Type: Grant
    Filed: September 18, 2012
    Date of Patent: January 2, 2018
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Leif Wilhelmsson, Stefan Parkvall, Gabor Fodor, Göran N. Klang, Erik Dahlman
  • Publication number: 20170374676
    Abstract: In an aspect, a transmitting node schedules a downlink transmission to a first UE over a first transmission interval having a predetermined length and starts the downlink transmission to the first UE in the first transmission interval. The transmitting node stops the downlink transmission to the first UE prior to an end of the first transmission interval to create a first end of a transmission hole in the downlink transmission to the first UE and resumes the downlink transmission to the first UE at a second end of the transmission hole. The transmitting node may receive an uplink transmission from a second UE or transmit a higher priority transmission, within the transmission hole.
    Type: Application
    Filed: October 28, 2016
    Publication date: December 28, 2017
    Inventors: Stefan Parkvall, Robert Baldemair, Håkan Björkegren, Erik Dahlman, Karl Werner
  • Patent number: 9854537
    Abstract: It is presented a method for assisting downlink interference estimation in a cellular network. The method is performed in a network node of the cellular network and comprises the steps of: estimating an average transmit power of the network node in a future time period; transmitting a power parameter based on the estimated average transmit power to at least one wireless device being served by the network node; and transmitting a reference signal for downlink interference estimation. A corresponding network node, wireless device, computer programs and computer program products are also presented.
    Type: Grant
    Filed: July 12, 2013
    Date of Patent: December 26, 2017
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Chrysostomos Koutsimanis, Erik Dahlman
  • Patent number: 9847861
    Abstract: A set of different pilot structures are designed for use in different environments and/or different user behaviors that are expected to occur in a cell. The radio conditions for a user are estimated. Each user is then assigned an area (108A-E) in resource space for its communication, which has a suitable pilot configuration. In one embodiment, the entire resource space is provided with different pilot structures in different parts (110A-D) In advance and allocation of resources to the users are then performed in order to match estimated radio conditions to the provided pilot structure. In another embodiment, allocation is performed first, and then the actual pilot structure is adapted within the allocated resource space area to suit the environmental conditions.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: December 19, 2017
    Assignee: Telefonaktiebolaged LM Ericsson (publ)
    Inventors: Johan Nyström, Pàl Frenger, Erik Dahlman, Svante Signell, Göran Klang
  • Publication number: 20170359156
    Abstract: Methods and apparatus are disclosed for receiving user data in a wireless communication system that employs coordinated multi-point transmission of the user data from a first cell serving a wireless terminal and a second cell site neighboring the first cell site. In an exemplary system, the first cell site maps control signals and user data to a time-frequency resources according to a first mapping pattern, while the second cell site maps control data and traffic data to the time-frequency resources according to a second mapping pattern.
    Type: Application
    Filed: August 9, 2017
    Publication date: December 14, 2017
    Inventors: George Jöngren, Erik Dahlman