Patents by Inventor Venkatasubramanian Ramasamy
Venkatasubramanian Ramasamy 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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Patent number: 9794910Abstract: Methods and apparatus enabling a mobile device to receive paging notifications from multiple networks. In one embodiment of the present invention, a first device connected to a first network momentarily ignores the first network, to monitor a second network instead. The first device identifies and prioritizes a list of applications of the first network; the prioritized listing allows the first device to preempt one of its lower priority tasks to monitor the second network for paging messages instead. The described methods and apparatus enable e.g., GSM paging for Class B cellular devices which are connected to GPRS NMO-2 type networks. The Class B cellular device can ignore certain GPRS data (which is tolerant to error), to decode GSM paging channels, which would otherwise be missed.Type: GrantFiled: January 13, 2014Date of Patent: October 17, 2017Assignee: Apple Inc.Inventors: Venkatasubramanian Ramasamy, Giri Prassad Deivasigamani, Srinivasan Vasudevan, Mohit Narang
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Patent number: 9661531Abstract: A method of reselecting a mobile wireless communication device to a network subsystem before initiating a connection with a wireless communication network. A connection request is received by the mobile wireless communication device in response to a user input. Attributes of signals received by the mobile wireless communication device from multiple network subsystems in the wireless communication network are measured over a period of time. The mobile wireless communication device is associated with one of the network subsystems and not associated with other network subsystems. The mobile wireless communication device reselects to one of the network subsystems based on quality metrics generated from the measured received signal attributes. After reselection, the mobile wireless communication device initiates a connection through the reselected network subsystem.Type: GrantFiled: September 15, 2014Date of Patent: May 23, 2017Assignee: Apple Inc.Inventors: Venkatasubramanian Ramasamy, Giri Prassad Deivasigamani, Srinivasan Vasudevan
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Patent number: 9629045Abstract: A method and apparatus for fast cell selection by a mobile wireless device. The mobile wireless device detects when a first wireless cell fails a set of stored suitability criteria and searches for and locates a set of candidate wireless cells to associate with. The mobile wireless device measures at least one received signal metric for each candidate wireless cell in the set of candidate wireless cells. When a candidate cell in the set of candidate wireless cells is identically the first wireless cell, the mobile wireless device evaluates the suitability of the candidate wireless cell using the stored set of suitability criteria for the first wireless cell and the measured at least one received signal metric for the candidate wireless cell. The mobile wireless communication device associates with the candidate wireless cell when the candidate wireless cell meets the stored set of suitability criteria.Type: GrantFiled: April 27, 2015Date of Patent: April 18, 2017Assignee: Apple Inc.Inventors: Giri Prassad Deivasigamani, Venkatasubramanian Ramasamy, Sharad Garg, Srinivasan Vasudevan
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Patent number: 9357506Abstract: Methods and apparatuses to select a transmit antenna in a mobile wireless device connected to a wireless network are described. The mobile wireless device monitors received signal characteristics through first and second antennas and switches antennas based on the monitored signal characteristics and on an assessment of the sufficiency of available transmit power headroom to accommodate data transmissions in the uplink direction. Sufficiency is determined based on one or more criteria including achievable data rate throughput, quality of service, grade of service, an amount of data buffered, an amount of resources allocated by the wireless network and a number of “power up” commands received by the mobile wireless device during a pre-determined time interval.Type: GrantFiled: September 8, 2014Date of Patent: May 31, 2016Assignee: Apple Inc.Inventors: Gaurav R. Nukala, Venkatasubramanian Ramasamy
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Publication number: 20150245368Abstract: Transmission capacity for a control channel sent to multiple mobile wireless devices in a wireless network is increased by transmitting the control channel using multi user multiple input multiple output transmissions (MU MIMO). Received signal quality measured at mobile wireless devices in a radio sector are communicated to a radio node and used to determine one or more sets of mobile wireless devices to share transmission of control channel elements on the same time and frequency resource element. The radio node indicates the use of MU MIMO and the selection of precoding matrices to each of the mobile wireless devices in the each set of mobile wireless devices.Type: ApplicationFiled: May 11, 2015Publication date: August 27, 2015Inventors: Gaurav R. NUKALA, Venkatasubramanian RAMASAMY, Giri Prassad DEIVASIGAMANI
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Publication number: 20150237549Abstract: A method and apparatus for fast cell selection by a mobile wireless device. The mobile wireless device detects when a first wireless cell fails a set of stored suitability criteria and searches for and locates a set of candidate wireless cells to associate with. The mobile wireless device measures at least one received signal metric for each candidate wireless cell in the set of candidate wireless cells. When a candidate cell in the set of candidate wireless cells is identically the first wireless cell, the mobile wireless device evaluates the suitability of the candidate wireless cell using the stored set of suitability criteria for the first wireless cell and the measured at least one received signal metric for the candidate wireless cell. The mobile wireless communication device associates with the candidate wireless cell when the candidate wireless cell meets the stored set of suitability criteria.Type: ApplicationFiled: April 27, 2015Publication date: August 20, 2015Inventors: Giri Prassad DEIVASIGAMANI, Venkatasubramanian RAMASAMY, Sharad GARG, Srinivasan VASUDEVAN
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Patent number: 9031033Abstract: Transmission capacity for a control channel sent to multiple mobile wireless devices in a wireless network is increased by transmitting the control channel using multi user multiple input multiple output transmissions (MU MIMO). Received signal quality measured at mobile wireless devices in a radio sector are communicated to a radio node and used to determine one or more sets of mobile wireless devices to share transmission of control channel elements on the same time and frequency resource element. The radio node indicates the use of MU MIMO and the selection of precoding matrices to each of the mobile wireless devices in the each set of mobile wireless devices.Type: GrantFiled: September 27, 2011Date of Patent: May 12, 2015Assignee: Apple Inc.Inventors: Gaurav R. Nukala, Venkatasubramanian Ramasamy, Giri Prassad Deivasigamani
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Patent number: 9020499Abstract: A method and apparatus for fast cell selection by a mobile wireless device. The mobile wireless device detects when a first wireless cell fails a set of stored suitability criteria and searches for and locates a set of candidate wireless cells to associate with. The mobile wireless device measures at least one received signal metric for each candidate wireless cell in the set of candidate wireless cells. When a candidate cell in the set of candidate wireless cells is identically the first wireless cell, the mobile wireless device evaluates the suitability of the candidate wireless cell using the stored set of suitability criteria for the first wireless cell and the measured at least one received signal metric for the candidate wireless cell. The mobile wireless communication device associates with the candidate wireless cell when the candidate wireless cell meets the stored set of suitability criteria.Type: GrantFiled: October 29, 2012Date of Patent: April 28, 2015Assignee: Apple Inc.Inventors: Giri Prassad Deivasigamani, Venkatasubramanian Ramasamy, Sharad Garg, Srinivasan Vasudevan
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Publication number: 20150105078Abstract: A method of reselecting a mobile wireless communication device to a network subsystem before initiating a connection with a wireless communication network. A connection request is received by the mobile wireless communication device in response to a user input. Attributes of signals received by the mobile wireless communication device from multiple network subsystems in the wireless communication network are measured over a period of time. The mobile wireless communication device is associated with one of the network subsystems and not associated with other network subsystems. The mobile wireless communication device reselects to one of the network subsystems based on quality metrics generated from the measured received signal attributes. After reselection, the mobile wireless communication device initiates a connection through the reselected network subsystem.Type: ApplicationFiled: September 15, 2014Publication date: April 16, 2015Inventors: Venkatasubramanian RAMASAMY, Giri Prassad DEIVASIGAMANI, Srinivasan VASUDEVAN
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Publication number: 20150065188Abstract: Methods and apparatuses to select a transmit antenna in a mobile wireless device connected to a wireless network are described. The mobile wireless device monitors received signal characteristics through first and second antennas and switches antennas based on the monitored signal characteristics and on an assessment of the sufficiency of available transmit power headroom to accommodate data transmissions in the uplink direction. Sufficiency is determined based on one or more criteria including achievable data rate throughput, quality of service, grade of service, an amount of data buffered, an amount of resources allocated by the wireless network and a number of “power up” commands received by the mobile wireless device during a pre-determined time interval.Type: ApplicationFiled: September 8, 2014Publication date: March 5, 2015Inventors: Gaurav R. NUKALA, Venkatasubramanian RAMASAMY
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Patent number: 8874041Abstract: An electronic device may contain wireless communication circuitry. The wireless communication circuitry may include radio-frequency transceiver circuitry coupled to multiple antennas. The electronic device may use the multiple antennas to make received signal power measurements. The signal power measurements may be made for each frequency in a list of frequencies used most recently by the electronic device in conveying data traffic between the electronic device and a wireless network. Based on received signal power measurements, the electronic device may select which frequency to use in performing system acquisition operations to attempt to establish a wireless communications link between the electronic device and the wireless network.Type: GrantFiled: October 3, 2011Date of Patent: October 28, 2014Assignee: Apple Inc.Inventors: Gaurav Nukala, Johnson O. Sebeni, Longda Xing, Venkatasubramanian Ramasamy, Sachin J. Sane, Tahir Shamim
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Patent number: 8838106Abstract: A method of reselecting a mobile wireless communication device to a network subsystem before initiating a connection with a wireless communication network. A connection request is received by the mobile wireless communication device in response to a user input. Attributes of signals received by the mobile wireless communication device from multiple network subsystems in the wireless communication network are measured over a period of time. The mobile wireless communication device is associated with one of the network subsystems and not associated with other network subsystems. The mobile wireless communication device reselects to one of the network subsystems based on quality metrics generated from the measured received signal attributes. After reselection, the mobile wireless communication device initiates a connection through the reselected network subsystem.Type: GrantFiled: April 28, 2010Date of Patent: September 16, 2014Assignee: Apple Inc.Inventors: Venkatasubramanian Ramasamy, Giri Prassad Deivasigamani, Srinivasan Vasudevan
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Patent number: 8831525Abstract: An electronic device may contain wireless communication circuitry. The wireless communication circuitry may include radio-frequency transceiver circuitry coupled to multiple antennas. The electronic device may use the multiple antennas to make received signal power measurements. The signal power measurements may be made for each frequency in a list of frequencies used most recently by the electronic device in conveying data traffic between the electronic device and a wireless network. Based on received signal power measurements, the electronic device may select which frequency to use in performing system acquisition operations to attempt to establish a wireless communications link between the electronic device and the wireless network.Type: GrantFiled: October 3, 2011Date of Patent: September 9, 2014Assignee: Apple Inc.Inventors: Gaurav Nukala, Johnson O. Sebeni, Longda Xing, Venkatasubramanian Ramasamy, Sachin J. Sane, Tahir Shamim
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Patent number: 8831532Abstract: Methods and apparatuses to select a transmit antenna in a mobile wireless device connected to a wireless network are described. The mobile wireless device monitors received signal characteristics through first and second antennas and switches antennas based on the monitored signal characteristics and on an assessment of the sufficiency of available transmit power headroom to accommodate data transmissions in the uplink direction. Sufficiency is determined based on one or more criteria including achievable data rate throughput, quality of service, grade of service, an amount of data buffered, an amount of resources allocated by the wireless network and a number of “power up” commands received by the mobile wireless device during a pre-determined time interval.Type: GrantFiled: February 27, 2012Date of Patent: September 9, 2014Assignee: Apple Inc.Inventors: Gaurav R. Nukala, Venkatasubramanian Ramasamy
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Patent number: 8761701Abstract: Method, apparatus and computer program product measuring signals received through multiple antennas in a mobile wireless device is described. Signals received through at least one of a primary antenna and a secondary antenna, during each cycle in a series of discontinuous reception cycles, is measured. The mobile wireless device switches between the primary and secondary antennas based on comparing the moving averages of the measured received signals to pre-determined thresholds. When unable to decode successfully a signal received on the primary antenna, the mobile wireless device switches to decode signals received on the secondary antenna.Type: GrantFiled: July 13, 2011Date of Patent: June 24, 2014Assignee: APPLE Inc.Inventors: Venkatasubramanian Ramasamy, Gaurav R. Nukala
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Publication number: 20140126522Abstract: Methods and apparatus enabling a mobile device to receive paging notifications from multiple networks. In one embodiment of the present invention, a first device connected to a first network momentarily ignores the first network, to monitor a second network instead. The first device identifies and prioritizes a list of applications of the first network; the prioritized listing allows the first device to preempt one of its lower priority tasks to monitor the second network for paging messages instead. The described methods and apparatus enable e.g., GSM paging for Class B cellular devices which are connected to GPRS NMO-2 type networks. The Class B cellular device can ignore certain GPRS data (which is tolerant to error), to decode GSM paging channels, which would otherwise be missed.Type: ApplicationFiled: January 13, 2014Publication date: May 8, 2014Applicant: Apple Inc.Inventors: Venkatasubramanian RAMASAMY, Giri Prassad DEIVASIGAMANI, Srinivasan VASUDEVAN, Mohit NARANG
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Patent number: 8718649Abstract: A method and apparatus for expanded cell search and selection in a mobile wireless device. The mobile device locates cells in a first of neighbor cells and in a second list of stored cells and evaluates located cells using suitability criteria. When locating a suitable first cell that uses a first radio access technology (RAT) in the first list, the first cell is selected. When locating a second suitable cell that uses a second RAT in the first list and not locating a suitable cell that uses the first RAT in the second list, the second cell is selected. When locating a third suitable cell that uses the second RAT in the first list and locating a fourth suitable cell that uses the first RAT in the second list, the fourth cell is selected when more suitable than the third cell.Type: GrantFiled: November 26, 2012Date of Patent: May 6, 2014Assignee: Apple Inc.Inventors: Venkatasubramanian Ramasamy, Giri Prassad Deivasigamani
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Patent number: 8706110Abstract: User equipment such as cellular telephones and other wireless electronic devices may communicate wirelessly with 2G and 3G cells in a cellular network. The cellular network may broadcast a list of primary scrambling codes corresponding to 3G cell sites that are potentially available for wirelessly communicating with the user equipment. The user equipment may perform an evaluation of primary scrambling code pilot signal strengths for each of the primary scrambling codes in the list. The user equipment may also maintain a record whenever a more extensive full primary scrambling code scan fails. If the evaluation reveals that at least one signal strength is sufficient, the cellular telephone may establish a corresponding 3G wireless link. If the evaluation does not identify any sufficiently strong 3G cells, a full pilot signal scan may be performed, provided that no full scans have failed within a predetermined time interval before the current time.Type: GrantFiled: February 10, 2010Date of Patent: April 22, 2014Assignee: Apple Inc.Inventors: Venkatasubramanian Ramasamy, Giri Prassad Deivasigamani, Srinivasan Vasudevan, Mohit Narang, Longda Xing
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Publication number: 20140106810Abstract: A method and apparatus to improve the robustness of a wireless communication link between a base station and a mobile communication device. The method increases power selectively on portions of an uplink communication signal transmitted from the mobile communication device to the base station. The method monitors a quality metric value at the mobile communication device and sets the transmit power level of the first portion of an uplink communication signal to the first power level, if the monitored quality metric value is in a first range of quality values, or sets the transmit power level of the first portion of the uplink communication signal to a second power level, if the monitored quality metric value is in a second range of quality values. The first portion of the uplink communication signal includes control signals used by a base station to maintain connection of the wireless communication link.Type: ApplicationFiled: October 7, 2013Publication date: April 17, 2014Applicant: APPLE INC.Inventors: Venkatasubramanian RAMASAMY, Giri Prassad DEIVASIGAMANI, Srinivasan VASUDEVAN, Mohit NARANG, Longda XING, Johnson O. SEBENI
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Patent number: 8630667Abstract: Methods and apparatus enabling a mobile device to receive paging notifications from multiple networks. In one embodiment of the present invention, a first device connected to a first network momentarily ignores the first network, to monitor a second network instead. The first device identifies and prioritizes a list of applications of the first network; the prioritized listing allows the first device to preempt one of its lower priority tasks to monitor the second network for paging messages instead. The described methods and apparatus enable e.g., GSM paging for Class B cellular devices which are connected to GPRS NMO-2 type networks. The Class B cellular device can ignore certain GPRS data (which is tolerant to error), to decode GSM paging channels, which would otherwise be missed.Type: GrantFiled: December 21, 2009Date of Patent: January 14, 2014Assignee: Apple Inc.Inventors: Venkatasubramanian Ramasamy, Girl Prassad Deivasigamani, Srinivasan Vasudevan, Mohit Narang