Patents by Inventor Christer Edholm
Christer Edholm 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: 20180084508Abstract: Channel estimation accuracy is improved by adjusting the power level of a physical control channel allocated to a receiver based on the transmission rate and/or transport format of a corresponding physical data channel allocated to the same receiver. The physical control channel may be a DPCCH, E-DPCCH or other type of physical control channel allocated to a receiver for facilitating uplink or downlink communication. In one embodiment, control channel symbols are transmitted for use in channel estimation by adjusting the power level of a physical control channel allocated to a receiver based on the transmission rate and/or transport format of a physical data channel allocated to the receiver (200). Control channel symbols are transmitted to the receiver over the physical control channel at the adjusted power level (202). The receiver uses the control channel symbols to perform channel estimation (204).Type: ApplicationFiled: November 29, 2017Publication date: March 22, 2018Inventors: Johan Mikael Bergman, Håkan B. Björkegren, Carmela Cozzo, Christer Edholm
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Patent number: 9867145Abstract: Channel estimation accuracy is improved by adjusting the power level of a physical control channel allocated to a receiver based on the transmission rate and/or transport format of a corresponding physical data channel allocated to the same receiver. The physical control channel may be a DPCCH, E-DPCCH or other type of physical control channel allocated to a receiver for facilitating uplink or downlink communication. In one embodiment, control channel symbols are transmitted for use in channel estimation by adjusting the power level of a physical control channel allocated to a receiver based on the transmission rate and/or transport format of a physical data channel allocated to the receiver (200). Control channel symbols are transmitted to the receiver over the physical control channel at the adjusted power level (202). The receiver uses the control channel symbols to perform channel estimation (204).Type: GrantFiled: October 26, 2012Date of Patent: January 9, 2018Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Johan Mikael Bergman, Håkan B. Björkegren, Carmela Cozzo, Christer Edholm
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Patent number: 9356739Abstract: A transmitter that may have marginal power availability is enabled to autonomously retransmit previously transmitted frames containing the same data. The transmitter sends an initial frame to a base transceiver station (BTS) and immediately retransmits the same frame without regard to any ACK/NAK transmission from the BTS. The retransmissions are accumulated in the receiver and decoded after a sufficient quantity of the frame is transmitted. After receiving the last retransmitted frame the BTS sends an ACK/NAK to the transmitter that is accepted.Type: GrantFiled: February 17, 2014Date of Patent: May 31, 2016Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Johan Torsner, Janne Peisa, Maria Edvardsson, Christer Edholm, Erik Dahlman, Stefan Parkvall
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Publication number: 20140226580Abstract: A transmitter that may have marginal power availability is enabled to autonomously retransmit previously transmitted frames containing the same data. The transmitter sends an initial frame to a base transceiver station (BTS) and immediately retransmits the same frame without regard to any ACK/NAK transmission from the BTS. The retransmissions are accumulated in the receiver and decoded after a sufficient quantity of the frame is transmitted. After receiving the last retransmitted frame the BTS sends an ACK/NAK to the transmitter that is accepted.Type: ApplicationFiled: February 17, 2014Publication date: August 14, 2014Applicant: Telefonaktiebolaget L M Ericsson (PUBL)Inventors: Johan Torsner, Janne Peisa, Maria Edvardsson, Christer Edholm, Erik Dahlman, Stefan Parkvall
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Patent number: 8705431Abstract: A transmitter that may have marginal power availability is enabled to autonomously retransmit previously transmitted frames containing the same data. The transmitter sends an initial frame to a base transceiver station (BTS) and immediately retransmits the same frame without regard to any ACK/NAK transmission from the BTS. The retransmissions are accumulated in the receiver and decoded after a sufficient quantity of the frame is transmitted. After receiving the last retransmitted frame the BTS sends an ACK/NAK to the transmitter that is accepted.Type: GrantFiled: May 10, 2004Date of Patent: April 22, 2014Assignee: Telefonaktiebolaget L M Ericsson (Publ)Inventors: Per Johan Torsner, Janne Johannes Peisa, Maria Edvardsson, Christer Edholm, Erik Dahlman, Stefan Parkvall
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Patent number: 8582595Abstract: The present invention relates to a system and a method for transmitting data between a first terminal and a communication network access point. The method may comprise the steps of defining a first set of scrambling codes and a second set of scrambling codes different from the first set of scrambling codes. Further, the method may comprise defining a first selection scheme for a first parameter. The method may still further comprise determining a current parameter value for the first parameter and evaluating the current parameter value on the basis of the first selection scheme and selecting a scrambling code from the first set of scrambling codes or the second set of scrambling codes based on the evaluation. Even further, the method may comprise packaging and transmitting data between the first terminal and the communication network access point using the selected scrambling codes.Type: GrantFiled: March 17, 2009Date of Patent: November 12, 2013Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Christer Edholm, Bo Göransson
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Patent number: 8565151Abstract: The present invention relates to a method and arrangements in a communications system enabled for transmission of several data streams to or from different receivers (120a-120c, 400) using a shared physical channel. The method comprises the step of masking control channel with different sequences corresponding to a receiver identity with respect to the number of simultaneously scheduled receivers.Type: GrantFiled: October 31, 2007Date of Patent: October 22, 2013Assignee: Telefonaktiebolaget LM Ericsson (Publ)Inventors: Bo Göransson, Christer Edholm, Stephen Grant, Erik Larsson, Frederik Ovesjö
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Patent number: 8489138Abstract: The present invention provides a solution for maintaining a reliable power control in a telecommunications network during soft handover between a serving and non serving base station when a dedicated physical control channel power is boosted due to an increased data rate.Type: GrantFiled: March 20, 2008Date of Patent: July 16, 2013Assignee: Telefonaktiebolaget L M Ericsson (Publ)Inventors: Johan Bergman, Carmela Cozzo, Christer Edholm
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Patent number: 8437295Abstract: The present invention relates to fast random access methods and arrangements for the enhanced uplink dedicated channel of E-UTRAN (Evolved Universal terrestrial radio access network). A user equipment (UE) being in a low activity state sends a random access request comprising a preamble on a physical random access channel (PRACH) to a NodeB. The NodeB receives the request and sends in response to the received random access request a response comprising information associated with detection of the preamble on an acquisition indicator channel (AICH). The response comprises further in an extension of the AICH an indication of an action to be taken by the UE. In an embodiment of the present invention the action is to access the E-DCH and the response comprises configuration parameters to the E-DCH.Type: GrantFiled: October 30, 2008Date of Patent: May 7, 2013Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Dirk Gerstenberger, Johan Bergman, Christer Edholm, Jose Luis Pradas, Stefan Wager, Yi-Pin Eric Wang
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Patent number: 8432874Abstract: A node (2) for use in a cellular communication system having interfering signals and employing interference cancellation techniques for mitigating the interfering signals comprises means (24) for obtaining a signal value representing power of a first signal. The node (2) further comprises means (25) for obtaining a precancellation interference value representing powers of signals interfering with the first signal before the interference cancellation is employed. A predictor (23) is arranged for predicting a postcancellation interference value after the interference cancellation as a function of the precancellation interference value. An estimator (29) is connected to the predictor (23) and the means (24) for obtaining a signal value. The estimator (29) is arranged for estimating a signal-to-interference ratio as a ratio between the signal value representing the power of the first signal and the predicted postcancellation interference value.Type: GrantFiled: February 26, 2009Date of Patent: April 30, 2013Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Hakan Bjorkegren, Christer Edholm
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Publication number: 20130051346Abstract: Channel estimation accuracy is improved by adjusting the power level of a physical control channel allocated to a receiver based on the transmission rate and/or transport format of a corresponding physical data channel allocated to the same receiver. The physical control channel may be a DPCCH, E-DPCCH or other type of physical control channel allocated to a receiver for facilitating uplink or downlink communication. In one embodiment, control channel symbols are transmitted for use in channel estimation by adjusting the power level of a physical control channel allocated to a receiver based on the transmission rate and/or transport format of a physical data channel allocated to the receiver (200). Control channel symbols are transmitted to the receiver over the physical control channel at the adjusted power level (202). The receiver uses the control channel symbols to perform channel estimation (204).Type: ApplicationFiled: October 26, 2012Publication date: February 28, 2013Inventors: Johan Mikael Bergman, Håkan B. Björkegren, Carmela Cozzo, Christer Edholm
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Patent number: 8369260Abstract: Channel estimation accuracy is improved by adjusting the power level of a physical control channel allocated to a receiver based on the transmission rate and/or transport format of a corresponding physical data channel allocated to the same receiver. The physical control channel may be a DPCCH, E-DPCCH or other type of physical control channel allocated to a receiver for facilitating uplink or downlink communication. Regardless, the control channel power level is optimized for channel estimation as a function of data transmission rate and/or transport format. In one embodiment, control channel symbols are transmitted for use in channel estimation by adjusting the power level of a physical control channel allocated to a receiver based on the transmission rate and/or transport format of a physical data channel allocated to the receiver (200). Control channel symbols are transmitted to the receiver over the physical control channel at the adjusted power level (202).Type: GrantFiled: December 13, 2007Date of Patent: February 5, 2013Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Johan Bergman, Håkan Björkegren, Carmela Cozzo, Christer Edholm
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Publication number: 20110176518Abstract: A node (2) for use in a cellular communication system having interfering signals and employing interference cancellation techniques for mitigating the interfering signals comprises means (24) for obtaining a signal value representing power of a first signal. The node (2) further comprises means (25) for obtaining a precancellation interference value representing powers of signals interfering with the first signal before the interference cancellation is employed. A predictor (23) is arranged for predicting a postcancellation interference value after the interference cancellation as a function of the precancellation interference value. An estimator (29) is connected to the predictor (23) and the means (24) for obtaining a signal value. The estimator (29) is arranged for estimating a signal-to-interference ratio as a ratio between the signal value representing the power of the first signal and the predicted postcancellation interference value.Type: ApplicationFiled: February 26, 2009Publication date: July 21, 2011Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Hakan Bjorkegren, Christer Edholm
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Publication number: 20100298021Abstract: The present invention provides a solution for maintaining a reliable power control in a telecommunications network during soft handover between a serving and non serving base station when a dedicated physical control channel power is boosted due to an increased data rate.Type: ApplicationFiled: March 20, 2008Publication date: November 25, 2010Applicant: TELEFONAKTIEBOLAGET L M ERICSSSON (PUBL)Inventors: Johan Bergman, Carmela Cozzo, Christer Edholm
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Publication number: 20100246701Abstract: The present invention relates to fast random access methods and arrangements for the enhanced uplink dedicated channel of E-UTRAN (Evolved Universal terrestrial radio access network). A user equipment (UE) being in a low activity state sends a random access request comprising a preamble on a physical random access channel (PRACH) to a NodeB. The NodeB receives the request and sends in response to the received random access request a response comprising information associated with detection of the preamble on an acquisition indicator channel (AICH). The response comprises further in an extension of the AICH an indication of an action to be taken by the UE. In an embodiment of the present invention the action is to access the E-DCH and the response comprises configuration parameters to the E-DCH.Type: ApplicationFiled: October 30, 2008Publication date: September 30, 2010Inventors: Dirk Gerstenberger, Johan Bergman, Christer Edholm, Jose Luis Pradas, Stefan Wager, Yi-Pin Eric Wang
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Publication number: 20100220657Abstract: The present invention relates to a method and arrangements in a communications system enabled for transmission of several data streams to or from different receivers (120a-120c, 400) using a shared physical channel. The method comprises the step of masking control channel with different sequences corresponding to a receiver identity with respect to the number of simultaneously scheduled receivers.Type: ApplicationFiled: October 31, 2007Publication date: September 2, 2010Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Bo Göransson, Christer Edholm, Stephen Grant, Erik Larsson, Fredrik Ovesjö
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Publication number: 20100022284Abstract: Channel estimation accuracy is improved by adjusting the power level of a physical control channel allocated to a receiver based on the transmission rate and/or transport format of a corresponding physical data channel allocated to the same receiver. The physical control channel may be a DPCCH, E-DPCCH or other type of physical control channel allocated to a receiver for facilitating uplink or downlink communication. Regardless, the control channel power level is optimized for channel estimation as a function of data transmission rate and/or transport format. In one embodiment, control channel symbols are transmitted for use in channel estimation by adjusting the power level of a physical control channel allocated to a receiver based on the transmission rate and/or transport format of a physical data channel allocated to the receiver (200). Control channel symbols are transmitted to the receiver over the physical control channel at the adjusted power level (202).Type: ApplicationFiled: December 13, 2007Publication date: January 28, 2010Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Johan Bergman, Håkan Björkegren, Carmela Cozzo, Christer Edholm
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Publication number: 20090291642Abstract: Systems and methods according to these exemplary embodiments provide for methods and systems for improving the signal-to-interference-plus-noise ratio (SIR) estimation between a mobile communications device and a base station (BS) for improving power control. A first SIR estimate is generated based on signals received on at least a first channel and a second SIR estimate is generated based on signals received on a second channel. A correction factor for the second SIR estimate is generated based on at least the first SIR estimate, and the second SIR estimate is adjusted with the correction factor. The first SIR estimate can, optionally, be generated using channel coefficients generated from signals received on both the first channel and the second channel.Type: ApplicationFiled: May 23, 2008Publication date: November 26, 2009Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Carmela Cozzo, Christer Edholm, Ning He
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Publication number: 20090190485Abstract: A method and apparatus for controlling the transmit power of a mobile device in a mobile communication network takes the level of self-interference into account to perform inner-loop power control. For normal inner-loop power control, a signal quality estimate is compared to a signal quality target and power control commands are generated based on the comparison. When self-interference is the dominant impairment in the received signal, a “fast break” is introduced to change inner-loop power control command generation.Type: ApplicationFiled: January 30, 2008Publication date: July 30, 2009Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Hakan Bjorkegren, Gregory E. Bottomley, Christer Edholm, Ning He, Jing Rao, Claes Tidestav
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Publication number: 20090061886Abstract: The teachings presented herein provide, among other things, improved power control stability and increased system capacity in a wireless communication network by raising signal quality targets for mobile stations engaged in scheduled uplink data transmissions and lowering those signal quality targets at the end of such transmissions. As one example, the teachings herein are applied to the Enhanced Uplink (EUL) in a Wideband CDMA (WCDMA) network. In that context, the target received signal quality (e.g., SIR) for a given mobile station's Dedicated Physical Control Channel (DPCCH) signal is raised for times when the mobile station is engaged in a scheduled data transmission via its Enhanced-Dedicated Physical Data Channel (E-DPDCH), and lowered at other times. Doing so prevents the power control loop from “chasing” the potentially dramatic changes in mobile-specific interference conditions that arise in a scheduled uplink environment.Type: ApplicationFiled: August 29, 2007Publication date: March 5, 2009Inventors: Carmela Cozzo, Christer Edholm, Hakan Eriksson