Patents by Inventor Ramanathan T. Jagadeesan
Ramanathan T. Jagadeesan 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: 7383046Abstract: According to a particular embodiment, a method for assisting in a handoff is provided that includes receiving signaling from one or more access points, which may transmit information to a mobile station. The information may be used to execute a handoff from an enterprise network to a cellular network or from the cellular network to the enterprise network.Type: GrantFiled: February 4, 2005Date of Patent: June 3, 2008Assignee: Cisco Technology, Inc.Inventors: Ramanathan T. Jagadeesan, Chol Su Kang, Bich T. Nguyen, David S. Stephenson, Richard D. Rebo
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Patent number: 7373413Abstract: Devices and methods are provided for minimizing the startup delay of streaming media transmitted through networks. A server maintains a portion of the media stream stored in an initial burst transmit buffer. At startup, the stored portion is transmitted at a rate higher than the fixed frame rate, exploiting the full available bandwidth. The initial burst transmission fills up the de-jitter receive buffer at the receiving end faster, thereby shortening the startup delay. Then transmission is switched to the regular rate, from the regular buffer. A variable bit rate transcoder is optionally used for the data of the initial transmission. The transcoder diminishes the size of these frames, so they can be transmitted faster. This shortens the start up delay even more. A receiver has a buffer with a fill level started at a value lower than a final value. This triggers the beginning of play out faster, further shortening the delay time.Type: GrantFiled: June 28, 2000Date of Patent: May 13, 2008Assignee: Cisco Technology, Inc.Inventors: Bich Nguyen, Ilya Slain, Kevin J. Connor, Luke K. Surazski, Ramanathan T. Jagadeesan
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Patent number: 7328015Abstract: A mobile device supports concurrent registrations of different wireless personalities with one or more service provider networks. Potentially using a single wireless interface, the mobile device can register and maintain multiple personalities and monitor for notifications targeted to any one of these personalities.Type: GrantFiled: December 16, 2005Date of Patent: February 5, 2008Assignee: Cisco Technology, Inc.Inventors: Michael A. Ramalho, Ramanathan T. Jagadeesan, Bich Tu Nguyen
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Patent number: 7319864Abstract: A system for providing a single number reachability solution for communications with a desktop telephone and a cellular telephone includes a mobility application coupled to a call management application. The call management application can associate a telephone number with a desktop telephone and a first communication port, receive a first telephone call initiated by a remote device and directed to the telephone number, and offer the first telephone call to the desktop telephone and to the first communication port. The mobility application can associate the first communication port with a cellular telephone, obtain a second communication port from multiple available communication ports in response to the offer, and place a second telephone call to the cellular telephone using the second communication port.Type: GrantFiled: November 15, 2004Date of Patent: January 15, 2008Assignee: Cisco Technology, Inc.Inventors: Ramanathan T. Jagadeesan, Christopher E. Pearce
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Patent number: 7310527Abstract: A method for handing off a call between networks includes monitoring a quality of a first link between a mobile station and a wireless local area network (WLAN) when the mobile station is actively connected with the WLAN on a call and monitoring a quality of a second link between the mobile station and a cellular network when the mobile station is actively connected with the WLAN on the call. The method also includes handing off the call from the WLAN to the cellular network when the quality of the first link is less than a handoff trigger threshold for a drop count duration and when the quality of the second link is greater than a minimum cellular link quality threshold.Type: GrantFiled: May 30, 2006Date of Patent: December 18, 2007Assignee: Cisco Technology, Inc.Inventors: Ramanathan T. Jagadeesan, Bich Tu Nguyen
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Patent number: 7299049Abstract: Devices, softwares methods hand off a live call from an original leg of a first modality (such as Circuit Switched Voice) to an alternate leg of another modality (such as Voice over Internet Protocol). An original leg of a call is established using the first modality. Then the alternate leg of the call is established using the second modality, while the first leg is still established. Then the call is handed off from the original leg to the alternate leg, while the connection is active.Type: GrantFiled: December 6, 2005Date of Patent: November 20, 2007Assignee: Cisco Technology, Inc.Inventor: Ramanathan T. Jagadeesan
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Patent number: 7283823Abstract: A mobile station includes a first wireless interface that can couple to a first wireless network, a second wireless interface that can couple to a second wireless network, and a controller. The controller can negotiate a first wireless link with the first wireless network using the first wireless interface and establish a communication session with a remote device using the first wireless link. The controller can also detect a session handoff trigger, negotiate a second wireless link with the second wireless network using the second wireless interface in response to the session handoff trigger, and invoke a private branch exchange feature to transfer the communication session from the first wireless link to the second wireless link.Type: GrantFiled: September 10, 2004Date of Patent: October 16, 2007Assignee: Cisco Technology, Inc.Inventors: Christopher E. Pearce, Ramanathan T. Jagadeesan, Bich T. Nguyen
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Patent number: 7251241Abstract: Source devices, softwares and methods are provided for predicting at a transmitting source how well a specific encoded frame, relative to other frames in a stream, would be reconstructed if it were not available for eventual playout at a receiving destination. If poorly, then the specific encoded frame is packetized and transmitted advantageously with respect to other packets in a stream. The transmitted stream will have higher jitter. Predicting is performed at the source by synthesizing a replicated frame, which emulates how the specific frame would be reconstructed at the destination. Then the replicated frame is compared with the decoded specific frame. The eventual playout will have a higher fidelity to the original, since reconstructed from more critical frames.Type: GrantFiled: August 21, 2002Date of Patent: July 31, 2007Assignee: Cisco Technology, Inc.Inventors: Ramanathan T. Jagadeesan, Luke Surazski
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Patent number: 7227853Abstract: A method is provided that includes receiving a request from a communication device to establish a communication session with a mobile station, the mobile station being operable to roam between a private and a public network. The mobile station is signaled via a cellular data network that a call is being initiated for the mobile station. Signaling information may be exchanged with a voice gateway such that one or more voice circuits are established. A signaling pathway may be established between an Internet protocol private branch exchange (IP PBX) and the mobile station via the cellular data network. The establishment of the signaling pathway is substantially concurrent with the establishment of one or more of the voice circuits. One or more features associated with a private network are delivered to the mobile station during the communication session as an end user moves between the public and private networks.Type: GrantFiled: June 16, 2006Date of Patent: June 5, 2007Assignee: Cisco Technology, Inc.Inventors: Ramanathan T. Jagadeesan, Bich T. Nguyen, Kamaldip Toor, Sudhakar S. Valluru, Christopher E. Pearce
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Patent number: 7082301Abstract: A method for handing off a call between networks includes monitoring a quality of a first link between a mobile station and a wireless local area network (WLAN) when the mobile station is actively connected with the WLAN on a call and monitoring a quality of a second link between the mobile station and a cellular network when the mobile station is actively connected with the WLAN on the call. The method also includes handing off the call from the WLAN to the cellular network when the quality of the first link is less than a handoff trigger threshold for a drop count duration and when the quality of the second link is greater than a minimum cellular link quality threshold.Type: GrantFiled: September 12, 2003Date of Patent: July 25, 2006Assignee: Cisco Technology, Inc.Inventors: Ramanathan T. Jagadeesan, Bich Tu Nguyen
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Patent number: 7076251Abstract: A method is provided that includes receiving a request from a communication device to establish a communication session with a mobile station. The request is responded to by signaling the mobile station via a cellular data network that a call is being initiated for the mobile station. Signaling information may be exchanged with a voice gateway such that one or more voice circuits are established to accommodate voice data that may propagate between the communication device and the mobile station. A signaling pathway may be established between an Internet protocol private branch exchange (IP PBX) and the mobile station via the cellular data network. The establishment of the signaling pathway is substantially concurrent with the establishment of one or more of the voice circuits such that one or more features associated with a private network are delivered to the mobile station during the communication session.Type: GrantFiled: September 11, 2003Date of Patent: July 11, 2006Assignee: Cisco Technology, Inc.Inventors: Ramanathan T. Jagadeesan, Bich T. Nguyen, Kamaldip Toor, Troy M. Trenchard, Sudhakar S. Valluru, Tony T. Wan
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Patent number: 7068622Abstract: A method is provided that includes receiving a request from a communication device to establish a communication session with a mobile station, the mobile station being operable to roam between a private and a public network. The mobile station is signaled via a cellular data network that a call is being initiated for the mobile station. Signaling information may be exchanged with a voice gateway such that one or more voice circuits are established. A signaling pathway may be established between an Internet protocol private branch exchange (IP PBX) and the mobile station via the cellular data network. The establishment of the signaling pathway is substantially concurrent with the establishment of one or more of the voice circuits. One or more features associated with a private network are delivered to the mobile station during the communication session as an end user moves between the public and private networks.Type: GrantFiled: February 21, 2005Date of Patent: June 27, 2006Assignee: Cisco Technology, Inc.Inventors: Ramanathan T. Jagadeesan, Bich T. Nguyen, Kamaldip Toor, Sudhakar S. Valluru, Christopher E. Pearce
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Patent number: 7003298Abstract: Devices, softwares methods hand off a live call from an original leg of a first modality (such as Circuit Switched Voice) to an alternate leg of another modality (such as Voice over Internet Protocol). An original leg of a call is established using the first modality. Then the alternate leg of the call is established using the second modality, while the first leg is still established. Then the call is handed off from the original leg to the alternate leg, while the connection is active.Type: GrantFiled: February 28, 2002Date of Patent: February 21, 2006Assignee: Cisco Technology, Inc.Inventor: Ramanathan T. Jagadeesan
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Patent number: 6999560Abstract: A test system measures performance of telephone network echo cancellers using a primary criterion of estimated user annoyance due to audible returned echo. The invention generates live telephone calls, uses real speech samples as stimulus signals and provides tail-circuit emulation using actual measured telephone tail-circuit impulse responses. These features provide better ‘real-life’ test conditions for the echo canceller system under test than current ITU standard test methods. Two methods are employed for echo canceller performance evaluation via metrics of estimated user annoyance due to echo. Energy-based method employs point-by-point comparison of talker speech and talker echo signal energy envelopes and uses variable energy thresholds for estimation of echo audibility. A perceptual-model based method uses a Perceptual Speech Distortion Metric (PSDM), such as ITU P.861, in an unique configuration to estimate user annoyance due to audible echo.Type: GrantFiled: June 28, 1999Date of Patent: February 14, 2006Assignee: Cisco Technology, Inc.Inventors: Kevin J. Connor, Michael E. Knappe, Ramanathan T. Jagadeesan
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Patent number: 6999417Abstract: Devices, software, and methods quantify a burstiness quality of the packet loss in the node of a path. The quantified burstiness becomes a metric for determining the Quality of Service (QoS) offered by a node in retransmitting data through a network. Network routing and rerouting decisions are made according to the improved QoS. The burstiness statistic is determined by counting lengths of episodes of sequentially discarded packets at the node. The burstiness statistic is incorporated as a metric with the other metrics of the QoS of the node.Type: GrantFiled: November 30, 2001Date of Patent: February 14, 2006Assignee: Cisco Technology, Inc.Inventors: Philip R. Graham, Ramanathan T. Jagadeesan, Bich Tu Nguyen
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Patent number: 6999763Abstract: A mobile device supports concurrent registrations of different wireless personalities with one or more service provider networks. Potentially using a single wireless interface, the mobile device can register and maintain multiple personalities and monitor for notifications targeted to any one of these personalities.Type: GrantFiled: August 14, 2003Date of Patent: February 14, 2006Assignee: Cisco Technology, Inc.Inventors: Michael A. Ramalho, Ramanathan T. Jagadeesan, Bich Tu Nguyen
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Patent number: 6930982Abstract: Devices, software, and methods measure a burstiness of packet loss episodes in transmissions of voice data through networks. At least one burstiness statistic is determined to quantify how the lost packets are distributed with respect to the received packets within the sequence. The burstiness statistic is optionally used to determine a figure of merit, which in turn can be used to give a grade for predicting how well a packet loss concealment scheme will work.Type: GrantFiled: December 12, 2000Date of Patent: August 16, 2005Assignee: Cisco Technology, Inc.Inventor: Ramanathan T. Jagadeesan
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Patent number: 6888808Abstract: A method is provided that includes receiving a request from a communication device to establish a communication session with a mobile station, the mobile station being operable to roam between a private and a public network. The mobile station is signaled via a cellular data network that a call is being initiated for the mobile station. Signaling information may be exchanged with a voice gateway such that one or more voice circuits are established. A signaling pathway may be established between an Internet protocol private branch exchange (IP PBX) and the mobile station via the cellular data network. The establishment of the signaling pathway is substantially concurrent with the establishment of one or more of the voice circuits. One or more features associated with a private network are delivered to the mobile station during the communication session as an end user moves between the public and private networks.Type: GrantFiled: September 15, 2003Date of Patent: May 3, 2005Assignee: Cisco Technology, Inc.Inventors: Ramanathan T. Jagadeesan, Bich T. Nguyen, Kamaldip Toor, Sudhakar S. Valluru, Christopher E. Pearce
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Patent number: 6836804Abstract: Devices, software and methods are provided for encoding voice data to conceal packet loss in Voice over Internet Protocol applications. The voice data of each frame is split into two groups, one of a low frequency band and one of a high frequency band. The two groups are transmitted through a network as separate packets. The high frequency group of one frame can be paired with the low frequency group of the next frame.Type: GrantFiled: October 30, 2000Date of Patent: December 28, 2004Assignee: Cisco Technology, Inc.Inventor: Ramanathan T. Jagadeesan
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Patent number: 6801622Abstract: Devices, software and methods are provided for encoding DTMF signals for telephone connections between digital voice communication systems that use compression, such as wireless connections or network connections. First the twist of the DTMF signals is determined, and then it is determined whether the twist is within a mapped range of a remote decoder. If not, the signal is first balanced to change the twist, and then the balanced signal is encoded.Type: GrantFiled: October 31, 2000Date of Patent: October 5, 2004Assignee: Cisco Technology, Inc.Inventor: Ramanathan T. Jagadeesan