Patents by Inventor Fredrik Lindqvist
Fredrik Lindqvist 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).
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Publication number: 20170164352Abstract: A physical uplink control channel (PUCCH) format for transmission of uplink control information (UCI) in unlicensed spectrum is either short PUCCH or long PUCCH. The short PUCCH occupies less than 1 subframe in the time domain and spans an entire system bandwidth in the frequency domain with interlacing on a resource block level. The long PUCCH occupies one subframe in the time domain and spans the entire system bandwidth in the frequency domain with interlacing on a resource block level.Type: ApplicationFiled: February 13, 2017Publication date: June 8, 2017Inventors: Yu Yang, Fredrik Lindqvist
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Publication number: 20170141918Abstract: A method (500) of generating a cryptographic checksum for a message M(x) is provided. The method comprises pseudo-randomly selecting (502) a generator polynomial p(x) from the set of polynomials of degree n over a Galois Field and calculating (504) the cryptographic checksum as a first function g of a division of a second function of M(x), ƒ(M(x)), modulo p(x), g(ƒ(M(x))mod p(x)). The generator polynomial p(x) is pseudo-randomly selected based on a first cryptographic key. By replacing a standard checksum, such as a Cyclic Redundancy Check (CRC), with a cryptographic checksum, an efficient message authentication is provided. The proposed cryptographic checksum may be used for providing integrity assurance on the message, i.e., for detecting random and intentional message changes, with a known level of security. Further, a corresponding computer program, a corresponding computer program product, and a checksum generator for generating a cryptographic checksum, are provided.Type: ApplicationFiled: June 27, 2014Publication date: May 18, 2017Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Elena DUBROVA, Fredrik LINDQVIST, Mats NÄSLUND, Göran SELANDER
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Publication number: 20170026979Abstract: The present disclosure concerns radio communication. More particularly, the present disclosure concerns a possible reduction in overhead signaling. The radio link quality of a first radio link (e.g., DL) as well as a second radio link (e.g., UL) is obtained 130. Also, the obtained radio link quality of the first radio link is compared 140 with the obtained radio link quality of the second radio link. This is done in order to establish whether a similarity in the radio link quality is within a predefined tolerance. Next, the signaling for both the first radio link and the second radio link is controlled 150 if, or when, the similarity of the radio link quality is determined to be within said predefined tolerance.Type: ApplicationFiled: December 20, 2013Publication date: January 26, 2017Applicant: Telefonaktiebolaget L M Ericsson (PUBL)Inventors: Konstantinos Dimou, Fredrik Lindqvist, Hugo Tullberg
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Publication number: 20160345356Abstract: A method is disclosed of a network node adapted to operate in association with first and second wireless communication devices associated with first and second latency requirements, respectively, wherein a latency of the second latency requirement is lower than a latency of the first latency requirement. The method comprises receiving a first scheduling request for uplink transmission by the first wireless communication device, and transmitting a first scheduling grant indicating an allocated first communication resource for the uplink transmission by the first wireless communication device.Type: ApplicationFiled: December 18, 2014Publication date: November 24, 2016Inventors: Bengt Lindoff, Robert Baldemair, Fredrik Lindqvist
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Patent number: 9470729Abstract: The present disclosure relates to determining parameters in a model of a transmission line. For determining the parameters, reflection coefficient defining data and the total capacitance of the transmission line are obtained. Further, true reflection coefficients obtained through the reflection coefficient defining data are applied in an objective function for the line. The objective function for the line is a sum of error signals and each error signal is the difference between a model value of a reflection coefficient and a corresponding true reflection coefficient. Further, the objective function is minimized by utilizing gradients of the objective function with respect to the transmission line parameters to be determined.Type: GrantFiled: April 8, 2011Date of Patent: October 18, 2016Assignee: TELEFONAKTIEBOLAGET L M ERICSSONInventors: Fredrik Lindqvist, Per Ola Börjesson, Antoni Fertner
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Publication number: 20160302183Abstract: Systems and methods are disclosed herein that relate to resource allocation and/or fallback operation for an uplink control channel format, e.g., that supports feedback (e.g., Hybrid Automatic Repeat Request (HARQ) Acknowledgement (ACK) (HARQ-ACK) feedback) for up to a large number (e.g., thirty-two) carriers.Type: ApplicationFiled: March 28, 2016Publication date: October 13, 2016Inventors: Yu Yang, Daniel Larsson, Shaohua Li, Fredrik Lindqvist, Xinghua Song
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Patent number: 9462531Abstract: A first network node (NN) (110) and a method for shortcutting a communication path between a first user equipment (UE) (120) and a second UE (122). When information about the second UE is in a set of information, which set of information (110S) comprises information about one or more downstream reachable UEs (120,122), and when the second UE is connected to the first NN, the data is transmitted to the second UE, whereby the path is shortcut. Furthermore, when information about the second UE is in the set of information and when a third NN (114) is downstream connected to the first NN, the data is transmitted to the third NN, whereby the path is shortcut.Type: GrantFiled: September 24, 2012Date of Patent: October 4, 2016Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Robert Baldemair, Jonas Kronander, Fredrik Lindqvist, Gunnar Mildh
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Publication number: 20160156444Abstract: A base station initializes pseudo-random sequence generators on which wireless devices base generation of uplink reference signals. The base station determines a first sequence from a first subset of possible initialization sequences for a sequence generator of a first device, and determines a second sequence from a second subset of possible initialization sequences for a sequence generator of a second device. The range of this second subset spans at least the range of the first subset. The base station further encodes the first sequence as a first set of two or more parameters, and encodes the second sequence as a second set of one or more parameters. This second set includes at least one parameter not included in the first set, and comprises fewer bits than the first set. The base station initializes the sequence generators by transmitting the first and second sets of parameters to the devices.Type: ApplicationFiled: January 26, 2016Publication date: June 2, 2016Inventors: Stefano Sorrentino, Fredrik Lindqvist
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Patent number: 9253005Abstract: A base station initializes pseudo-random sequence generators on which wireless devices base generation of uplink reference signals. The base station determines a first sequence from a first subset of possible initialization sequences for a sequence generator of a first device, and determines a second sequence from a second subset of possible initialization sequences for a sequence generator of a second device. The range of this second subset spans at least the range of the first subset. The base station further encodes the first sequence as a first set of two or more parameters, and encodes the second sequence as a second set of one or more parameters. This second set includes at least one parameter not included in the first set, and comprises fewer bits than the first set. The base station initializes the sequence generators by transmitting the first and second sets of parameters to the devices.Type: GrantFiled: April 3, 2014Date of Patent: February 2, 2016Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Stefano Sorrentino, Fredrik Lindqvist
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Publication number: 20150358057Abstract: A method and a first radio node (110) for determining a first precoder to be used by the first radio node (110) for sending a transmission to a second radio node (120) are disclosed. The first radio node (110) measures (301) a set of cross-channel responses. The first radio node (110) encodes (302) the set of cross-channel responses into a first code-book index using a quantization scheme. The first radio node (110) sends (303) the first code-book index to a central unit (150). The first radio node (110) receives (307) a second code-book index from the central unit (150). The first radio node (110) obtains a second precoder (308) by decoding the second code-book index. The first radio node (110) determines (309) the first precoder by compensating the second precoder while taking the quantization scheme and the co-operative interference mitigation scheme into account.Type: ApplicationFiled: February 21, 2013Publication date: December 10, 2015Inventors: Fredrik Lindqvist, Maxime Guillaud, Mohsen Rezaeekheirabadi
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Publication number: 20150245274Abstract: A first network node (NN) (110) and a method for shortcutting a communication path between a first user equipment (UE) (120) and a second UE (122). When information about the second UE is in a set of information, which set of information (110S) comprises information about one or more downstream reachable UEs (120,122), and when the second UE is connected to the first NN, the data is transmitted to the second UE, whereby the path is shortcut. Furthermore, when information about the second UE is in the set of information and when a third NN (114) is downstream connected to the first NN, the data is transmitted to the third NN, whereby the path is shortcut.Type: ApplicationFiled: September 24, 2012Publication date: August 27, 2015Inventors: Robert Baldemair, Jonas Kronander, Fredrik Lindqvist, Gunnar Mildh
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Patent number: 9118369Abstract: A base station initializes pseudo-random sequence generators on which wireless devices base generation of uplink reference signals. The base station determines a first sequence from a first subset of possible initialization sequences for a sequence generator of a first device, and determines a second sequence from a second subset of possible initialization sequences for a sequence generator of a second device. The range of this second subset spans at least the range of the first subset. The base station further encodes the first sequence as a first set of two or more parameters, and encodes the second sequence as a second set of one or more parameters. This second set includes at least one parameter not included in the first set, and comprises fewer bits than the first set. The base station initializes the sequence generators by transmitting the first and second sets of parameters to the devices.Type: GrantFiled: April 3, 2014Date of Patent: August 25, 2015Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Stefano Sorrentino, Fredrik Lindqvist
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Patent number: 9009017Abstract: Embodiments of the present invention relate to an arrangement for analyzing transmission line properties. Measurement data providing means provide data of a first frequency dependent line property, line property calculation arrangement with model handling means, a Hubert transform handler and line property determination means calculate said first property based on model parameters, line resistance at 0 frequency, roc, a cut-off frequency, v, a line capacitance C? and a line inductance L?H. The line model handling means calculates the line inductance L(f) via a Hubert transform of a function of Q(f/v), wherein the function Q(f/v) relates the line resistance R(f) to roc as R(f)=roc·Q(f/v). The Hilbert transform values are calculated using a parameterized closed form expression for the Hubert transform or they are tabulated.Type: GrantFiled: January 8, 2010Date of Patent: April 14, 2015Assignee: Telefonaktiebolaget LM Ericsson (Publ)Inventors: Antoni Fertner, Fredrik Lindqvist, Ioanna Pappa, Klas Ericson, Miguel Berg, Per Ola Börjesson, Stefan Höst
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Patent number: 8848555Abstract: The present invention relates to a method for managing transmission resources in a digital communication system comprising an access network, such as a DSL system, implementing resource management for minimization of cross-talk interference in a cable or cable binder of the access network comprising a number, N of lines. It comprises the steps of: determining, by means of calculating means, for a respective of said lines, a relevant line set, comprising interference relevant lines, for said respective line, and applying, for the respective line, an algorithm for resource management using the determined relevant line set, thus reducing computational complexity of the resource management algorithm.Type: GrantFiled: November 27, 2008Date of Patent: September 30, 2014Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Fredrik Lindqvist, Boris Dortschy, Aldebaro Klautau, Maria Neiva da silva fonseca Lindqvist, Evaldo Goncalves Pelaes
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Publication number: 20140211885Abstract: A base station initializes pseudo-random sequence generators on which wireless devices base generation of uplink reference signals. The base station determines a first sequence from a first subset of possible initialization sequences for a sequence generator of a first device, and determines a second sequence from a second subset of possible initialization sequences for a sequence generator of a second device. The range of this second subset spans at least the range of the first subset. The base station further encodes the first sequence as a first set of two or more parameters, and encodes the second sequence as a second set of one or more parameters. This second set includes at least one parameter not included in the first set, and comprises fewer bits than the first set. The base station initializes the sequence generators by transmitting the first and second sets of parameters to the devices.Type: ApplicationFiled: April 3, 2014Publication date: July 31, 2014Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Stefano Sorrentino, Fredrik Lindqvist
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Publication number: 20140211835Abstract: A base station initializes pseudo-random sequence generators on which wireless devices base generation of uplink reference signals. The base station determines a first sequence from a first subset of possible initialization sequences for a sequence generator of a first device, and determines a second sequence from a second subset of possible initialization sequences for a sequence generator of a second device. The range of this second subset spans at least the range of the first subset. The base station further encodes the first sequence as a first set of two or more parameters, and encodes the second sequence as a second set of one or more parameters. This second set includes at least one parameter not included in the first set, and comprises fewer bits than the first set. The base station initializes the sequence generators by transmitting the first and second sets of parameters to the devices.Type: ApplicationFiled: April 3, 2014Publication date: July 31, 2014Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Stefano Sorrentino, Fredrik Lindqvist
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Patent number: 8731124Abstract: A base station initializes pseudo-random sequence generators on which wireless devices base generation of uplink reference signals. The base station determines a first sequence from a first subset of possible initialization sequences for a sequence generator of a first device, and determines a second sequence from a second subset of possible initialization sequences for a sequence generator of a second device. The range of this second subset spans at least the range of the first subset. The base station further encodes the first sequence as a first set of two or more parameters, and encodes the second sequence as a second set of one or more parameters. This second set includes at least one parameter not included in the first set, and comprises fewer bits than the first set. The base station initializes the sequence generators by transmitting the first and second sets of parameters to the devices.Type: GrantFiled: May 10, 2012Date of Patent: May 20, 2014Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Stefano Sorrentino, Fredrik Lindqvist
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Patent number: 8699448Abstract: In a method of interference rejection combining (IRC) for mitigating interference in received signals in the frequency domain for a telecommunication system, selecting (S 10) a sub-group of frequencies of a received signal, determining (S20) a joint representation of a covariance matrix for the interference plus noise for at least one time slot of the received signal for the selected sub-group of frequencies, determining (S30) a channel estimate based on at least one pilot symbol of said at least one time slot. Finally, determining (S40) IRC coefficients in the frequency domain for each symbol of said at least one time slot based on said determined joint representation of the covariance matrix and said determined channel estimate.Type: GrantFiled: December 9, 2009Date of Patent: April 15, 2014Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Fredrik Lindqvist, Fredrik Huss
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Patent number: 8681945Abstract: Method, arrangement and devices for calibration of a line driving device, such as a DSLAM, having a line port. The method comprises deriving of a first parameter vector, PVinf, for example Hinf. The parameter vector PVinf is derived by performing, at a first site, an echo measurement on the line driving device while the line port on said line driving device is open. The method further comprises calibrating the line driving device based on the first parameter vector PVinf and a second parameter vector PVref, which second parameter vector is based on information on echo measurements performed on at least one reference line driving device.Type: GrantFiled: December 22, 2011Date of Patent: March 25, 2014Assignee: Telefonaktiebolaget LM Ericsson (Publ)Inventors: Klas Ericson, Antoni Fertner, Fredrik Lindqvist, Henrik Almeida, Miguel Berg, Per Ola Borjesson
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Publication number: 20140025327Abstract: The invention concerns a method for determining parameters in a model of a transmission line. The method comprises obtaining (36) measurements of the line comprising reflection coefficient defining data and the total line capacitance, applying (38) true reflection coefficients obtained through the reflection coefficient defining data in an objective function for the line, which function comprises a sum of error signals, each comprising the difference between a model value of a reflection coefficient and a corresponding true reflection coefficient, minimising (40) the objective function by utilizing gradients of the objective function with respect to the transmission line parameters to be determined and employing a capacitive length and determining (42) at least two further transmission line parameters as combinations of a basic resistive transmission line parameter, a basic capacitive transmission line parameter and a basic inductive transmission line parameter of the transmission line model.Type: ApplicationFiled: April 8, 2011Publication date: January 23, 2014Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventors: Fredrik Lindqvist, Per Ola Börjesson, Antoni Fertner