Patents by Inventor Muhammad Imadur Rahman
Muhammad Imadur Rahman 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: 10172151Abstract: The embodiments herein relate to method in a network node (301) for handling scheduling of a wireless device (305) in a communications network (300). The network node (301) is adapted to communicate with the wireless device (305) over a radio channel (310). The network node (301) dynamically allocates a set of non-consecutive subframes in which the network node (301) is to transmit data to the wireless device (305) or receive data from the wireless device (305). The network node (301) transmits a multi-Time Transmission Interval, TTI, scheduling message to the wireless device (305), which multi-TTI scheduling message comprises information indicating the dynamically allocated non-consecutive subframes.Type: GrantFiled: January 18, 2013Date of Patent: January 1, 2019Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: David Hammarwall, Daniel Larsson, Muhammad Imadur Rahman
-
Patent number: 9820295Abstract: Coordination information for controlling base-station-to-base-station interference is transmitted from one radio network node (900) (e.g., an LTE eNodeB) to another, using certain parts of the TDD subframe. One example method, as might be implemented in a radio network node (900) such as an LTE eNodeB, includes the generating (1010) of a TDD coordination signal and the transmitting (1020) of the TDD coordination signal to one or more other radio network nodes. In some embodiments, the coordination signal is transmitted in a guard period of a special subframe at the target node. In others, the coordination signal is transmitted in another interval during which the receiving node is not transmitting, such as in uplink subframe for the receiving node, an uplink portion of a special subframe at the receiving node, or in a downlink subframe or downlink portion of a special subframe during which the receiving node is not transmitting.Type: GrantFiled: May 21, 2013Date of Patent: November 14, 2017Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Muhammad Imadur Rahman, David Astely, Erik Eriksson, Daniel Larsson, Eliane Semaan, Xinghua Song
-
Patent number: 9685702Abstract: The invention discloses a beamforming method for polarized antenna array consisting of a plurality of antenna elements, applied to single layer beamforming or dual layer beamforming, which includes the steps: determining (201) first beamforming weights for phase compensation among the antenna elements within each polarization direction; determining (202) second beamforming weights for phase compensation between equivalent channels of two polarization directions; and calculating (203) hybrid beamforming weights as product of the first beamforming weights and the second beamforming weights. A beamforming apparatus for polarized antenna array is also provided in the invention as well as a radio communication device and a system thereof. With the invention, the single-layer and dual-layer beamforming weights are determined for the cross-polarized antenna array without requiring full channel knowledge or the aid of PMI. Computation complexity is lowered and full power amplifier utilization can be achieved.Type: GrantFiled: December 17, 2010Date of Patent: June 20, 2017Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Yang Hu, David Astely, Zhiheng Guo, Muhammad Imadur Rahman, Hai Wang, Ruiqi Zhang
-
Patent number: 9667378Abstract: A communications system comprises a second device (28) and a first device (30). The first device (30) is of a type which receives, on a downlink over a radio interface from a second device, precoded information (29). In an example mode the first device 28 generates a multi-part feedback signal (22) which is configured to affect content of a precoder matrix (40) utilized by the second device (28). On an uplink over the radio interface to the second device, at least two different parts of the multi-part feedback signal are transmitted with two respective different transmission granularities in time and/or frequency.Type: GrantFiled: June 17, 2010Date of Patent: May 30, 2017Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: George Jöngren, Muhammad Imadur Rahman
-
Patent number: 9609637Abstract: The embodiments herein relate to a method in a network node (301) for handling scheduling of a wireless device (305) in a communications network (300). The network node (301) is adapted to communicate wirelessly with the wireless device (305) over a radio channel (310). The network node (301) determines that a data transmission or data reception corresponding to a multi-TTI scheduling message previously transmitted to the wireless device (305) should be at least one of adjusted, interrupted and terminated. The network node (301) transmits, to the wireless device (305), information indicating that the data transmission or data reception corresponding to a previously transmitted multi-Transmission Time Interval, TTI, scheduling message should be at least one of adjusted, interrupted and terminated as determined.Type: GrantFiled: January 18, 2013Date of Patent: March 28, 2017Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: David Hammarwall, Daniel Larsson, Muhammad Imadur Rahman, Xinghua Song
-
Publication number: 20150351117Abstract: Coordination information for controlling base-station-to-base-station interference is transmitted from one radio network node (900)(e.g., an LTE eNodeB) to another, using certain parts of the TDD subframe. One example method, as might be implemented in a radio network node (900) such as an LTE eNodeB, includes the generating (1010) of a TDD coordination signal and the transmitting (1020) of the TDD coordination signal to one or more other radio network nodes. In some embodiments, the coordination signal is transmitted in a guard period of a special subframe at the target node. In others, the coordination signal is transmitted in another interval during which the receiving node is not transmitting, such as in uplink subframe for the receiving node, an uplink portion of a special subframe at the receiving node, or in a downlink subframe or downlink portion of a special subframe during which the receiving node is not transmitting.Type: ApplicationFiled: May 21, 2013Publication date: December 3, 2015Inventors: Muhammad Imadur Rahman, Xinghua Song, Eliane Semaan, Erik Eriksson, Daniel Larsson, David Astely
-
Publication number: 20150305058Abstract: The embodiments herein relate to method in a network node (301) for handling scheduling of a wireless device (305) in a communications network (300). The network node (301) is adapted to communicate with the wireless device (305) over a radio channel (310). The network node (301) dynamically allocates a set of non-consecutive subframes in which the network node (301) is to transmit data to the wireless device (305) or receive data from the wireless device (305). The network node (301) transmits a multi-Time Transmission Interval, TTI, scheduling message to the wireless device (305), which multi-TTI scheduling message comprises information indicating the dynamically allocated non-consecutive subframes.Type: ApplicationFiled: January 18, 2013Publication date: October 22, 2015Inventors: David Hammarwall, Daniel Larsson, Muhammad Imadur Rahman
-
Patent number: 8989062Abstract: Method and arrangement in a base station for sending data to a user equipment. The base station comprises an instance of a codebook, corresponding to another instance of the codebook comprised in the user equipment. The method comprises obtaining channel state information from a signal received from the user equipment, estimating a channel to be used for transmitting data to the user equipment, calculating a precoder, based on the obtained channel state information. Further is comprised the steps of selecting a precoding index from the codebook based on the calculated precoder, or selecting a precoding index received from the user equipment, precoding data to be transmitted to the user equipment using the calculated precoder and transmitting the precoded data, a non-user dedicated reference signal and the precoding index on the estimated channel to the user equipment. Further, corresponding method and arrangement in a user equipment are described.Type: GrantFiled: May 4, 2010Date of Patent: March 24, 2015Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Muhammad Imadur Rahman, David Astely, Fan Sun
-
Patent number: 8874122Abstract: A node (105, 200) for a communications system (100), arranged to operate as a secondary user of part of a frequency spectrum, comprising a detection unit (210) for detecting other secondary users (110) who use all or part of said frequency spectrum and for detecting changes in such other secondary user's usage of their part of the frequency spectrum. The node (105, 200) also comprises a signaling unit (225) for signaling to detected other secondary users (110) that the node (105, 200) wishes to operate within their frequency spectrum as a secondary user, by means of transmitting interference signals according to a predefined pattern in the frequency spectrum of detected other secondary users. The node also comprises a decision unit (230) for deciding how the node (105, 200) should arrange its secondary operation in the frequency spectrum together with detected other secondary users (110).Type: GrantFiled: July 13, 2010Date of Patent: October 28, 2014Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Jorgen Karlsson, Tim Irnich, Jonas Kronander, Mikael Prytz, Muhammad Imadur Rahman
-
Publication number: 20140177487Abstract: The embodiments herein relate to a method in a network node (301) for handling scheduling of a wireless device (305) in a communications network (300). The network node (301) is adapted to communicate wirelessly with the wireless device (305) over a radio channel (310). The network node (301) determines that a data transmission or data reception corresponding to a multi-TTI scheduling message previously transmitted to the wireless device (305) should be at least one of adjusted, interrupted and terminated. The network node (301) transmits, to the wireless device (305), information indicating that the data transmission or data reception corresponding to a previously transmitted multi-Transmission Time Interval, TTI, scheduling message should be at least one of adjusted, interrupted and terminated as determined.Type: ApplicationFiled: January 18, 2013Publication date: June 26, 2014Applicant: Telefonaktiebolaget L M Ericsson (publ)Inventors: David Hammarwall, Daniel Larsson, Muhammad Imadur Rahman, Xinghua Song
-
Patent number: 8737507Abstract: Determining transmitter antenna weights at a base station having more available transmit antennas than the available number of reference signals can be performed by transmitting reference signals and receiving channel feedback data derived by a mobile terminal from the reference signals. The reference signals are each assigned to one of two or more antenna groupings, wherein at least a first one of the antenna groupings includes two or more transmit antennas, and transmitted using at least one transmit antenna from the corresponding antenna grouping. A first beam-forming vector for the first one of the antenna grouping is determined, and mapping the one or more data streams to the transmit antennas according to a final precoding matrix that depends on the channel feedback data and the first beam-forming vector is performed, to obtain a weighted transmit signal for each of the antennas.Type: GrantFiled: May 14, 2009Date of Patent: May 27, 2014Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: David Astely, George Jöngren, Muhammad Imadur Rahman
-
Publication number: 20140022966Abstract: The technology disclosed provides the ability for a subframe to be configured as a “flexible” subframe. As a result, at least three different types of subframes in a TDD system may be configured: a downlink (“DL”) subframe, an uplink (“UL”) subframe, and a “flexible” subframe. While the DL and UL subframes are preconfigured for each frame instance, the flexible subframes are dynamically allocated to be an uplink subframe in one instance of a frame and a downlink subframe in another instance of the frame.Type: ApplicationFiled: September 25, 2013Publication date: January 23, 2014Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Stefan PARKVALL, David ASTELY, Erik DAHLMAN, Johan NYSTROM, Muhammad Imadur RAHMAN, Yngve SELÉN, Johan SKÖLD
-
Patent number: 8559343Abstract: The technology disclosed provides the ability for a subframe to be configured as a “flexible” subframe. As a result, at least three different types of subframes in a TDD system may be configured: a downlink (“DL”) subframe, an uplink (“UL”) subframe, and a “flexible” subframe. While the DL and UL subframes are preconfigured for each frame instance, the flexible subframes are dynamically allocated to be an uplink subframe in one instance of a frame and a downlink subframe in another instance of the frame.Type: GrantFiled: June 16, 2010Date of Patent: October 15, 2013Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Stefan Parkvall, David Astely, Erik Dahlman, Johan Nyström, Muhammad Imadur Rahman, Yngve Selén, Johan Sköld
-
Publication number: 20130257655Abstract: The invention discloses a beamforming method for polarized antenna array consisting of a plurality of antenna elements, applied to single layer beamforming or dual layer beamforming, which includes the steps: determining (201) first beamforming weights for phase compensation among the antenna elements within each polarization direction; determining (202) second beamforming weights for phase compensation between equivalent channels of two polarization directions; and calculating (203) hybrid beamforming weights as product of the first beamforming weights and the second beamforming weights. A beamforming apparatus for polarized antenna array is also provided in the invention as well as a radio communication device and a system thereof. With the invention, the single-layer and dual-layer beamforming weights are determined for the cross-polarized antenna array without requiring full channel knowledge or the aid of PMI. Computation complexity is lowered and full power amplifier utilization can be achieved.Type: ApplicationFiled: December 17, 2010Publication date: October 3, 2013Applicant: Telefonaktiebolaget L M Ericsson (Publ)Inventors: Yang Hu, David Astely, Zhiheng Guo, Muhammad Imadur Rahman, Hai Wang, Ruiqi Zhang
-
Publication number: 20130115964Abstract: A node (105, 200) for a communications system (100), arranged to operate as a secondary user of part of a frequency spectrum, comprising a detection unit (210) for detecting other secondary users (110) who use all or part of said frequency spectrum and for detecting changes in such other secondary user's usage of their part of the frequency spectrum. The node (105, 200) also comprises a signaling unit (225) for signaling to detected other secondary users (110) that the node (105, 200) wishes to operate within their frequency spectrum as a secondary user, by means of transmitting interference signals according to a predefined pattern in the frequency spectrum of detected other secondary users. The node also comprises a decision unit (230) for deciding how the node (105, 200) should arrange its secondary operation in the frequency spectrum together with detected other secondary users (110).Type: ApplicationFiled: July 13, 2010Publication date: May 9, 2013Applicant: Telefonaktiebolaget L M Ericsson (publ)Inventors: Jorgen Karlsson, Tim Irnich, Jonas Kronander, Mikael Prytz, Muhammad Imadur Rahman
-
Publication number: 20130039235Abstract: Method and arrangement in a base station for sending data to a user equipment. The base station comprises an instance of a codebook, corresponding to another instance of the codebook comprised in the user equipment. The method comprises obtaining channel state information from a signal received from the user equipment, estimating a channel to be used for transmitting data to the user equipment, calculating a precoder, based on the obtained channel state information. Further is comprised the steps of selecting a precoding index from the codebook based on the calculated precoder, or selecting a precoding index received from the user equipment, precoding data to be transmitted to the user equipment using the calculated precoder and transmitting the precoded data, a non-user dedicated reference signal and the precoding index on the estimated channel to the user equipment. Further, corresponding method and arrangement in a user equipment are described.Type: ApplicationFiled: May 4, 2010Publication date: February 14, 2013Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Muhammad Imadur Rahman, David Astely, Fan Sun
-
Patent number: 8355474Abstract: An apparatus and method for interference cancellation in multiple-antenna communication system is disclosed. Accordingly, a receiver of a multiple-antenna communication system cancels interference by selecting either a multiple-symbol processing scheme or a single-symbol processing scheme depending on a signal type, thereby improving performance of the communication system.Type: GrantFiled: April 4, 2008Date of Patent: January 15, 2013Assignee: Samsung Electronics Co., LtdInventors: Elisabeth De Carvalho, Muhammad Imadur Rahman, David Mazzarese, Yang Tang, Jin-Kyu Koo
-
Publication number: 20110205930Abstract: Techniques are disclosed for determining transmitter antenna weights at a base station (12) having more available transmit antennas (150) than the available number of reference signals. An exemplary method includes transmitting (530) a plurality of reference signals and receiving (540) channel feedback data derived by a mobile terminal (14) from the reference signals. The reference signals are each assigned to a corresponding one of two or more antenna groupings, wherein at least a first one of the antenna groupings comprises two or more transmit antennas (150), and transmitted using at least one transmit antenna (150) from the corresponding antenna grouping.Type: ApplicationFiled: May 14, 2009Publication date: August 25, 2011Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Muhammad Imadur Rahman, George Jöngren, David Astely
-
Publication number: 20110149813Abstract: The technology disclosed provides the ability for a subframe to be configured as a “flexible” subframe. As a result, at least three different types of subframes in a TDD system may be configured: a downlink (“DL”) subframe, an uplink (“UL”) subframe, and a “flexible” subframe. While the DL and UL subframes are preconfigured for each frame instance, the flexible subframes are dynamically allocated to be an uplink subframe in one instance of a frame and a downlink subframe in another instance of the frame.Type: ApplicationFiled: June 16, 2010Publication date: June 23, 2011Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Stefan PARKVALL, David ASTELY, Erik DAHLMAN, Johan NYSTRÖM, Muhammad Imadur RAHMAN, Yngve SELÉN, Johan SKÖLD
-
Publication number: 20110080969Abstract: A communications system comprises a second device (28) and a first device (30). The first device (30) is of a type which receives, on a downlink over a radio interface from a second device, precoded information (29). In an example mode the first device 28 generates a multi-part feedback signal (22) which is configured to affect content of a precoder matrix (40) utilized by the second device (28). On an uplink over the radio interface to the second device, at least two different parts of the multi-part feedback signal are transmitted with two respective different transmission granularities in time and/or frequency.Type: ApplicationFiled: June 17, 2010Publication date: April 7, 2011Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: George Jöngren, Muhammad Imadur Rahman