Patents by Inventor Kotikalapudi Sriram

Kotikalapudi Sriram 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).

  • Publication number: 20130302033
    Abstract: In an automatically switched optical network, the wavelengths are assigned to optical path based on their intrinsic physical performance and on the current network operating parameters. The wavelength performance information is organized in binning tables, based primarily on the wavelength reach capabilities. A network topology database provides the distance between the nodes of the network, which is used to determine the length of the optical path. Other network operating parameters needed for wavelength selection are also available in this database. Once a bin corresponding to the path length is identified in the binning table, the wavelength for that path is selected based on length only, or based on the length and one or more additional parameters. The optical path performance is estimated for the selected wavelength, and the search continues if the estimated path performance is not satisfactory.
    Type: Application
    Filed: July 17, 2013
    Publication date: November 14, 2013
    Applicant: Alcatel Lucent
    Inventors: Kotikalapudi Sriram, Mukul Katiyar, Jonathan Titchener, Rajender Rao Nednur, Anthony Vernon Walker Smith
  • Patent number: 8521022
    Abstract: In an automatically switched optical network, the wavelengths are assigned to optical path based on their intrinsic physical performance and on the current network operating parameters. The wavelength performance information is organized in binning tables, based primarily on the wavelength reach capabilities. A network topology database provides the distance between the nodes of the network, which is used to determine the length of the optical path. Other network operating parameters needed for wavelength selection are also available in this database. Once a bin corresponding to the path length is identified in the binning table, the wavelength for that path is selected based on length only, or based on the length and one or more additional parameters. The optical path performance is estimated for the selected wavelength, and the search continues if the estimated path performance is not satisfactory.
    Type: Grant
    Filed: April 23, 2002
    Date of Patent: August 27, 2013
    Assignee: Alcatel Lucent
    Inventors: Kotikalapudi Sriram, Mukul Katiyar, Jonathan Titchener, Rajender Rao Nednur, Anthony Vernon Walker Smith
  • Patent number: 7414968
    Abstract: An AAL2/SSCS packet voice system multiplexes various forms of voice-band traffic including voice packets, fax packets, and data packets into a virtual circuit (VC). This AAL2/SSCS packet voice system executes a dynamic call admission algorithm that takes into account call type in deciding whether to admit a new call to the VC. In particular, this approach takes into account different bandwidth needs for different call types. The AAL2/SSCS packet voice system also performs bit or block dropping on voice packets to mitigate the effects of traffic congestion. The bit or block dropping is done based on the packet queue fill value exceeding at least one queue threshold. Further, the AAL2/SSCS packet voice system also dynamically varies a queue threshold as a function of capacity.
    Type: Grant
    Filed: March 9, 2000
    Date of Patent: August 19, 2008
    Assignee: Lucent Technologies Inc.
    Inventors: Kotikalapudi Sriram, Yung-Terng Wang
  • Patent number: 7170893
    Abstract: A communication node comprises a receiver for receiving packets and a routing device for routing the received packets to one of two output ports. For each output port, the communication node further comprises a classifier for classifying a received packet based on its traffic characteristic and storing that packet in a corresponding queue for that traffic characteristic, and a concatenated packets preparer for concatenating n received packets from each queue to form a concatenated packet to be transmitted by the associated output port, where the maximum of n is determined based on the traffic characteristic of the associated queue.
    Type: Grant
    Filed: June 15, 2001
    Date of Patent: January 30, 2007
    Assignee: Lucent Technologies Inc.
    Inventors: Govinda Nallappa Rajan, Kotikalapudi Sriram
  • Patent number: 6813277
    Abstract: A protocol for handling multiple access on broadband communication networks, e.g., fiber/coax networks and wireless networks, supports both continuous bit rate (CBR) and variable bit rate (VBR) traffic representing voice, video telephony, interactive television, and data. The invention is carried out both in customer premise equipment (CPE) at stations, and in a common controller with which all stations communicate. A medium access control (MAC) processor provided in each of the stations and in the common controller divides the time domain for a given RF channel into a series of successive frames, each having a plurality of time slots. Because of the architecture of the communication network, individual stations do not communicate directly with each other, but can receive broadcast messages indicating the status of each time slot, which messages are generated in the common controller and transmitted in a downstream channel.
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: November 2, 2004
    Assignee: Lucent Technologies Inc.
    Inventors: Eugene L. Edmon, Chia-Chang Li, Kotikalapudi Sriram
  • Patent number: 6674744
    Abstract: The specification relates to a device and method utilized for packaging voice data (and other delay critical ‘connection’ or ‘flow’ type application data) for point-to-point transport from one Packet Circuit Gateway (PCG) to a second PCG over Label Switching Routers (LSRs) within an Internet Protocol (IP) network; the beneficial aspects of the packaging format being: (i) a reduced overhead requirement when compared to conventional IP telephony due to inclusion of a switching label in lieu of an appended IP header, thereby increasing network bandwidth efficiency, and (ii) the increased transport speed associated with layer two label switching when compared to layer three forwarding.
    Type: Grant
    Filed: September 22, 1998
    Date of Patent: January 6, 2004
    Assignee: Lucent Technologies Inc.
    Inventors: Bharat Tarachand Doshi, Enrique Hernandez-Valencia, Kotikalapudi Sriram, Yung-Terng Wang, On-Ching Yue
  • Patent number: 6529499
    Abstract: A quality of service guarantee for voice and other delay sensitive transmissions within an Internet Protocol (IP) network is provided by identifying the IP network path utilized for IP packet transmission between source and destination edge devices and virtually provisioning IP network path bandwidth for priority voice traffic. Priority for voice packets and admission control of new voice calls (and other delay sensitive traffic) based on the remaining available capacity over the IP network path guarantees that high priority voice (and other delay sensitive traffic) meet stringent delay requirements. A Virtual Provisioning Server is utilized to maintain bandwidth capacity data for each path segment within the IP network and to forward the bandwidth capacity data to a Signaling Gateway. The Signaling Gateway determines whether to accept or reject an additional delay sensitive traffic component based upon available bandwidth capacity for an IP network path.
    Type: Grant
    Filed: September 22, 1998
    Date of Patent: March 4, 2003
    Assignee: Lucent Technologies Inc.
    Inventors: Bharat Tarachand Doshi, Enrique Hernandez-Valencia, Kotikalapudi Sriram, Yung-Terng Wang, On-Ching Yue
  • Publication number: 20020196787
    Abstract: A communication node comprises a receiver for receiving packets and a routing device for routing the received packets to one of two output ports. For each output port, the communication node further comprises a classifier for classifying a received packet based on its traffic characteristic and storing that packet in a corresponding queue for that traffic characteristic, and a concatenated packets preparer for concatenating n received packets from each queue to form a concatenated packet to be transmitted by the associated output port, where the maximum of n is determined based on the traffic characteristic of the associated queue.
    Type: Application
    Filed: June 15, 2001
    Publication date: December 26, 2002
    Inventors: Govinda Nallappa Rajan, Kotikalapudi Sriram
  • Publication number: 20020057709
    Abstract: A protocol for handling multiple access on broadband communication networks, e.g., fiber/coax networks and wireless networks, supports both continuous bit rate (CBR) and variable bit rate (VBR) traffic representing voice, video telephony, interactive television, and data. The invention is carried out both in customer premise equipment (CPE) at stations, and in a common controller with which all stations communicate. A medium access control (MAC) processor provided in each of the stations and in the common controller divides the time domain for a given RF channel into a series of successive frames, each having a plurality of time slots. Because of the architecture of the communication network, individual stations do not communicate directly with each other, but can receive broadcast messages indicating the status of each time slot, which messages are generated in the common controller and transmitted in a downstream channel.
    Type: Application
    Filed: December 26, 2001
    Publication date: May 16, 2002
    Inventors: Eugene L. Edmon, Chia-Chang Li, Kotikalapudi Sriram
  • Patent number: 6349138
    Abstract: The specification relates to a method and apparatus supporting multiple access, bi-directional data and multimedia transfer described over a hybrid fiber/coax (HFC) network, though applicable to transmissions over other media as well. The protocol associated with the present invention supports downstream broadcast transmission from headend to cable modem, and also provides for allocation of bandwidth for cable modems to transmit back to the headend. The protocol supports different access modes such as STM, ATM, and VL; within each subframe of a subframe/frame/masterframe structure. The protocol is utilized over a system which provides for forward error correction (FEC) and scrambling/descrambling, while eliminating the deleterious effects on the error correcting capability of the FEC due to the bit error spreading associated with a scrambling/descrambling function.
    Type: Grant
    Filed: April 23, 1997
    Date of Patent: February 19, 2002
    Assignee: Lucent Technologies Inc.
    Inventors: Bharat Tarachand Doshi, Subrahmanyam Dravida, George John Kustka, Peter D. Magill, Curtis A. Siller, Kotikalapudi Sriram
  • Patent number: 6282196
    Abstract: In a packet voice system, a dynamic build-out delay approach in a receiver during the duration of a call. In particular, the build-out delay is applied at least twice during the duration of the call. In one embodiment, a packet voice system includes an ATM Adaptation Layer Type 2 (AAL-2) and Service Specific Convergence Sublayer (SSCS) System. The receiver portion of the SSCS System recovers AAL-2 packets and plays back the compressed audio to a voice decoding element. In providing playback, the receiver applies the build-out delay at the start of each talk-spurt. The voice decoding element provides an uncompressed audio stream. In another embodiment, the receiver portion of the SSCS System applies the build-out delay at the start of the each talk-spurt as a function of the length of the previous silence interval.
    Type: Grant
    Filed: July 24, 1997
    Date of Patent: August 28, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Terry Gregory Lyons, Kotikalapudi Sriram, Yung-Terng Wang
  • Patent number: 6219339
    Abstract: In a packet voice system, discarding of a packet is performed as a function of previously discarded packets. In one embodiment, a packet voice system includes an ATM Adaptation Layer Type 2 (AAL2) and Service Specific Convergence Sublayer (SSCS) System. In this system, a transmission buffer stores AAL2 voice packets for transmission, each AAL2 voice packet comprising a sequence number, the values of which range from 0 to n−1, and a source identifier, k. When traffic congestion is detected, the transmitter portion of the SSCS System selectively discards one packet from a source k at the output of the transmission buffer if no packet from source k was dropped in either the last n−1 packets or over a predefined prior interval of time. Another embodiment of the invention discards packets at the input of the transmission buffer.
    Type: Grant
    Filed: February 20, 1998
    Date of Patent: April 17, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Bharat Tarachand Doshi, Kotikalapudi Sriram, Yung-Terng Wang
  • Patent number: 6169738
    Abstract: An AAL2/SSCS packet voice system multiplexes various forms of voice-band traffic including voice packets, fax packets, and data packets into a virtual circuit (VC). This AAL2/SSCS packet voice system executes a dynamic call admission algorithm that takes into account call type in deciding whether to admit a new call to the VC. In particular, this approach takes into account different bandwidth needs for different call types. The AAL2/SSCS packet voice system also performs bit or block dropping on voice packets to mitigate the effects of traffic congestion. The bit or block dropping is done based on the packet queue fill value exceeding at least one queue threshold. Further, the AAL2/SSCS packet voice system also dynamically varies a queue threshold as a function of capacity.
    Type: Grant
    Filed: November 6, 1997
    Date of Patent: January 2, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Kotikalapudi Sriram, Yung-Terng Wang
  • Patent number: 6075798
    Abstract: A packet voice system includes an ATM Adaptation Layer Type 2 (AAL-2) and Service Specific Convergence Sublayer (SSCS) System comprising a transmitter and a receiver. A portion of the 32 codepoints of the five bit RES (or UUI) field of the AAL-2 header are predefined to indicate an extended header. This a prior definition is stored in tables in both the transmitter and the receiver. The extended header itself comprises an additional octet appended to the AAL-2 header. A sequence number is normally carried in the RES field for the packet stream of voice calls that require sequence numbers. When the extended header is used, the sequence number is part of the extended header and thus messages are conveyed from the transmitter to the receiver without causing an interruption to sequence number assignment messages The transmitter dynamically uses the extended header and discontinues use of the extended header after a predefined duration of time or upon receiving an acknowledgment from the receiver.
    Type: Grant
    Filed: June 20, 1997
    Date of Patent: June 13, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Terry Gregory Lyons, Kotikalapudi Sriram
  • Patent number: 6055242
    Abstract: The specification relates to a broadband multiple access protocol for bi-directional hybrid fiber/coax (HFC) networks. The protocol supports downstream broadcast transmission from headend to cable modem, and also provides for allocation of bandwidth for cable modems to transmit back to the headend. Although the present invention is described in relation to an HFC network, it is also equally applicable to a wireless communications environment. The protocol supports different access modes such as synchronous transfer mode, asynchronous transfer mode, and variable length data. The protocol adapts to changing demands for a mix of circuit and packet mode applications and allocates upstream and downstream bandwidth in response to the a variety of bursty and isochronous traffic sources.
    Type: Grant
    Filed: March 6, 1997
    Date of Patent: April 25, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Bharat Tarachand Doshi, Subrahmanyam Dravida, George John Kustka, Peter D. Magill, Curtis A. Siller, Kotikalapudi Sriram
  • Patent number: 6041051
    Abstract: The specification relates to a broadband multiple access protocol for bi-directional hybrid fiber/coax (HFC) networks. The protocol supports downstream broadcast transmission from headend to cable modem, and also provides for allocation of bandwidth for cable modems to transmit back to the headend. Although the present invention is described in relation to an HFC network, it is also equally applicable to a cellular wireless communications environment. The protocol supports different access modes such as STM, ATM, and VL; within each subframe of a subframe/frame/masterframe structure. The protocol adapts to changing demands for a mix of circuit and packet mode applications and allocates upstream and downstream bandwidth in response to the a variety of bursty and isochronous traffic sources.
    Type: Grant
    Filed: April 3, 1997
    Date of Patent: March 21, 2000
    Assignee: Lucent Technologies, Inc.
    Inventors: Bharat Tarachand Doshi, Subrahmanyam Dravida, George John Kustka, Peter D. Magill, Curtis A. Siller, Kotikalapudi Sriram
  • Patent number: 5953344
    Abstract: A head-end dynamically allocates bandwidth of a communications channel as a function of the type of communications traffic. In particular, the head-end communicates to subscriber stations via a broadband cable network using an access protocol, which is modified to provide a variable number of mini-slots and a variable number of data slots in each frame. Each mini-slot is used to request assignment of a data slot(s) to subscriber stations for the communication of information and, also, as a vehicle to resolve contention between subscriber stations. The head-end dynamically adjusts the number of mini-slots over a period time as a function of the type of communications traffic, e.g., bursty and isochronous traffic sources. Any variation in the number of mini-slots concomitantly effects the number of data slots available to communicate information. For example, less mini-slots provides more data slots.
    Type: Grant
    Filed: December 10, 1996
    Date of Patent: September 14, 1999
    Assignee: Lucent Technologies Inc.
    Inventors: James E. Dail, Chia-Chang Li, Peter D. Magill, Kotikalapudi Sriram
  • Patent number: 5936965
    Abstract: The specification relates to a system supporting the transmission of multiple protocols over a single bytestream. The multiple protocol types supported include asynchronous transfer mode (ATM) protocol data units (PDUs), synchronous transfer mode (STM) PDUs, and variable length (VL) PDUs, as well as subtypes included within the aforementioned multiple protocol types. PDUs from higher layers are processed at three intermediate protocol layers where application layer PDUs are prepared, segmented, and repacked as asynchronous block multiplexing (ABM) PDUs. ABM PDUs include a type identification field. Cyclical redundancy checks and other error detection/correction techniques are optionally supported. ABM PDUs are multiplexed within a multiple protocol bytestream. Multiple protocol bytestream support is provided between a transmitter and receiver over a plurality of mediums, including but not limited to coaxial cable, wireless, optical fiber, hybrid fiber/coax, satellite, and twisted pair.
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: August 10, 1999
    Assignee: Lucent Technologies, Inc.
    Inventors: Bharat Tarachand Doshi, Subrahmanyam Dravida, Kotikalapudi Sriram
  • Patent number: 5570355
    Abstract: STM traffic, e.g. voice and video telephony (VT), as well as packet mode (e.g. ATM) traffic, e.g. broadcast digital video, interactive television, and data, are transmitted via a multiple access broadband fiber/coaxial cable network. Customer premises equipment (CPE) at stations, and a bandwidth controller, which may be at a head end or central office, with which all stations communicate, work together to adapt to the changing demands of the traffic mix, and efficiently allocate bandwidth to a variety of bursty and isochronous traffic sources. The bandwidth allocation defines two types of time slots, STM and ATM, and divides each frame into two corresponding STM and ATM regions. The boundary between the regions can be changed dynamically. A contention access signaling channel is provided in the STM region, for call control and set-up requests.
    Type: Grant
    Filed: November 17, 1994
    Date of Patent: October 29, 1996
    Assignee: Lucent Technologies Inc.
    Inventors: James E. Dail, Chia-Chang Li, Peter D. Magill, Kotikalapudi Sriram, Norman A. Whitaker, Jr.
  • Patent number: 5463620
    Abstract: A wide variety of call traffic is effectively integrated in a single broadband communications network. Calls having widely differing bandwidth requirements and sensitivities to delay are handled by the network with efficient, effective, and fair bandwidth allocation and transmission scheduling. This is accomplished by classifying each call in accordance with certain signal characteristics, such as required bandwidth and sensitivity to delay. Each call class is directed to a separate queuing circuit. Some calls in certain classes, such as those associated with high-bandwidth constant bit rate services, are each directed to their own individual queuing circuits. Other calls within a class are statistically multiplexed into a single queuing circuit for that class.
    Type: Grant
    Filed: February 22, 1994
    Date of Patent: October 31, 1995
    Assignee: AT&T IPM Corp.
    Inventor: Kotikalapudi Sriram