Patents Represented by Attorney William Ryan
  • Patent number: 7031326
    Abstract: Unicast endpoint clients (110, 111, 115) on an IP Unicast network (107, 108) are provided access to Multicast sessions on an IP Multicast network (101) through a Multicast-Unicast gateway server (120, 121). The server obtains information about sessions on the Multicast network and makes such information available to a Unicast client on the Unicast network upon request by the client. Upon being presented with a list describing the subject matter of each session, the user at the Unicast client selects the session to which he or she wants to join, which causes the Multicast-Unicast server to join the appropriate session on behalf of the requesting client for each media type in which the joining client wants to be a participant. The server then sets a bi-directional Unicast User Datagram Protocol (UDP) stream between itself and the client. All packets then received by the server from the Unicast client are address-translated to the appropriate Multicast session address.
    Type: Grant
    Filed: April 30, 2001
    Date of Patent: April 18, 2006
    Assignee: AT&T Corp
    Inventors: David Hilton Shur, Aleksandr Zelezniak
  • Patent number: 6804345
    Abstract: Paging, cellular telephone or other messaging functionality is incorporated into a virtual contact center system to permit logged-off customer service representatives (CSRs) to be alerted to a need to logon to the system, and to permit CSRs to alert supervisors or specialists to logon to the system. Matching at a contact control server of existing conditions to predetermined criteria, e.g., failure to login at an assigned time, or specified network conditions (such as length of customer queues), triggers a command for a communication to one or more logged-off CSRs. Results of follow-up testing at the contact control server for matches causes page requests to be renewed, redirected or canceled.
    Type: Grant
    Filed: January 27, 2000
    Date of Patent: October 12, 2004
    Assignee: AT&T Corp
    Inventors: Srinivas Bala, Mark Jeffrey Foladare, Kathleen C. Fowler, Shelley B. Goldman, Shaoqing Q. Wang, Roy Philip Weber, Robert S. Westrich
  • Patent number: 6751608
    Abstract: A method and apparatus provide improved cache coherency and more effective caching operations without placing an undue burden on network links. A proxy receives a request for a resource and then, depending on information in the proxy cache, generates a resource request for transmission to a resource server. The proxy appends a proxy filter to the request. The resource server maintains one or more volumes of resources based on some predetermined criterion that can be either static or dynamic in nature. Upon receipt of the request and the proxy filter the resource server generates a request response and a piggybacked list of additional resources selected from the volume with which the requested resource is associated.
    Type: Grant
    Filed: October 16, 2001
    Date of Patent: June 15, 2004
    Assignee: AT&T Corp.
    Inventors: Edith Cohen, Balachander Krishnamurthy, Jennifer Lynn Rexford
  • Patent number: 6535736
    Abstract: The present invention, in illustrative embodiments, implements systems and methods for adjusting the timing of access requests in mobile communications systems, such as IS-95-A mobile telephone systems, to reduce the likelihood of request collisions—especially during periods of very high calling rates. These embodiments employ measurements of access channel occupancy, as well as system operator inputs, to develop thresholds and parameter translations at a base station. Execution of control algorithms at a base station advantageously yields modified persistence test parameters sent to mobile stations. When overload conditions are present, these modified parameters cause the mobile stations to experience variable delays through judicious control of persistence testing at the mobile stations.
    Type: Grant
    Filed: December 11, 1998
    Date of Patent: March 18, 2003
    Assignee: Lucent Technologies Inc.
    Inventors: Dan Anthony Balogh, John K. Burgess, Terry Si-Fong Cheng, Ching Yao Huang, Shawn S. Yu
  • Patent number: 6377972
    Abstract: A new architecture and operational techniques for supporting high quality live and on-demand streaming multimedia on a data network. By using Helper machines inside the network as data forwarding, caching, and buffering agents, and by forming meshes among Helper machines, advantages of homogeneous, synchronous multicast transmission and of heterogeneous, asynchronous reception are achieved. The architecture provides essentially transparently support to the receivers for near-zero start-up latency, improved playback quality, improved CR-like operations. These are achieved while reducing network and server load compared to today's multimedia networking techniques.
    Type: Grant
    Filed: January 19, 1999
    Date of Patent: April 23, 2002
    Assignee: Lucent Technologies Inc.
    Inventors: Katherine Hua Guo, Markus Andreas Hofmann, Tze Sing Eugene Ng, Sanjoy Paul, Hui Zhang
  • Patent number: 6370129
    Abstract: High-speed wireless data systems and methods are described for simultaneously supporting multiple data users, including flexible mixed-traffic services, using an illustrative CDMA architecture. Embodiments are compatible with current and third generation CDMA systems, while achieving spectral efficiencies that are in some cases an order of magnitude or more higher. Embodiments advantageously employ multiple antennas at the transmitter and receiver and code spreading to realize multiple access systems. Some illustrative receiver embodiments advantageously employ a decorrelating detector, while others feature a decorrelating decision-feedback detector. In typical operation, each of a plurality of high-speed data streams directed to respective data users is demultiplexed into multiple (G>1) lower rate substreams, which are modulated by a CDMA spreading code and transmitted from M antennas at a base station.
    Type: Grant
    Filed: June 5, 2000
    Date of Patent: April 9, 2002
    Assignee: Lucent Technologies, Inc.
    Inventor: Howard Huang
  • Patent number: 6336090
    Abstract: Automatic Speech Recognition (ASR) is achieved in wireless communications systems in which reliable ASR feature vector sequences are derived at a base station directly from digitally transmitted speech coder parameters, with no additional processing or signal modification required at the originating handset. No secondary channel need be provided for the transmission of ASR feature vectors. In operating on received speech coder parameters prior to conversion to a voice signal the present system and methods avoid the lossy conversion process and associated voice distortion. Since the received voice parameters are error protected during transmission they are received with greater accuracy. All, or a subset, of speech coding parameters, including, in appropriate cases, spectral envelope parameters, reflection coefficients, LSPs, LSFs, LPCs, LPCCs, and weighted LPCCs may be processed at a receiving base station or forwarded to another location for processing.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: January 1, 2002
    Assignee: Lucent Technologies Inc.
    Inventors: Wu Chou, Michael Charles Recchione, Qiru Zhou
  • Patent number: 6327361
    Abstract: A method and system for controlling overload at a network processor in a communications system. Messages relating to a plurality of types of calls, functions or processes (collectively, “calls”) received at a processor seeking access to processor resources are granted normal access when the delay in processing such messages does not exceed threshold values. When such delay exceeds a threshold, messages are blocked in numbers relating to, among other things, the number of messages allowed in a reference interval, message delay, the total number of blocked calls, the number of blocked calls of each type, the number of calls allowed in one or more preceding intervals and preferences between types of calls.
    Type: Grant
    Filed: July 13, 1998
    Date of Patent: December 4, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Paramasiviah Harshavardhana, Manu Malek, Kazem Anaraky Sohraby
  • Patent number: 6324169
    Abstract: A method for providing real-time multimedia conferencing services is described over a hybrid network, consisting of packet-switched nonguaranteed quality of service local area networks and a cell-switched wide area network having a multimedia bridge connected to the wide area network. The local area networks and the multimedia bridge are interconnected to the wide area network via routers. New architectural entities within the multimedia bridge execute a multimedia performance and resource analysis algorithm and determine whether the network and the bridge have sufficient resources to satisfy the requirements of the multimedia conference call. If sufficient resources are not available, it is determined whether the requirements for the higher priority services can be provided by preempting the lower priority resources.
    Type: Grant
    Filed: February 29, 2000
    Date of Patent: November 27, 2001
    Assignee: AT&T Corp.
    Inventor: Radhika R. Roy
  • Patent number: 6321271
    Abstract: A real-time method for routing subject to an acceptable delay constraint between nodes in high-speed data networks, such as PNNI protocol networks, uses an illustrative two-phase algorithm employing Dijkstra's algorithm at each phase. In an illustrative first phase, the Dijkstra SPF algorithm is used in seeking the shortest cumulative delay from the destination to the source, thereby generating cumulative delay labels from a node j to the destination node k. The delay results are then employed in the second phase, where the Dijkstra SPF algorithm is illustratively employed for determining administrative weight (AW) as the link metric subject to modification in accordance with results obtained in the first phase.
    Type: Grant
    Filed: December 22, 1998
    Date of Patent: November 20, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Muralidharan Sampath Kodialam, Wing Cheong Lau, Anlu Yan
  • Patent number: 6304349
    Abstract: Methods for provisioning optical communications networks employing wavelength division multiplexing (WDM) technology provide for routing and wave-length assignment of a set of connection requests. Avoiding many of the pitfalls of exactly optimum solutions, the present heuristic methods provide much shorter execution times while providing near-optimum performance. Adaptations of the basic solutions provide design of restorable networks capable of handling a specified set of failures. This approach advantageously is based on considering all failures simultaneously, and performs better than solutions in which independent designs are developed for each failure. Networks designed using these methods store configuration information for primary network configurations and for one or more restoration networks.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: October 16, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Murat Alanyali, Ender Ayanoglu
  • Patent number: 6292023
    Abstract: A finite state machine in which n discrete states of the machine are encoded using a set of n bistable elements permitting simplified decoding of states. Transitions between discrete states are illustratively executed by selectively directing a bistable device to a 1 state using transition circuits activated by positive transitions of asynchronous spiking inputs. In one illustrative embodiment the positive transition is capacitively coupled to a switch that connects the complement output of a bistable element to ground, thereby causing the nominal output of that element to approach a voltage corresponding to a 1 state. In a second illustrative embodiment a pass transistor combination maintains a capacitor at the nominal output voltage of the bistable element in a 1 state until a spiking input signal arrives. A combination of the spiking input signal and the voltage on the capacitor connects the complement output of another bistable element to ground, thus switching that other bistable element.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: September 18, 2001
    Assignee: Agere Systems Guardian Corp.
    Inventors: Ruben Herrera, Rahul Sarpeshkar
  • Patent number: 6278998
    Abstract: A system and method for discovering association rules that display regular cyclic variation over time is disclosed. Such association rules may apply over daily, weekly or monthly (or other) cycles of sales data or the like. A first technique, referred to as the sequential algorithm, treats association rules and cycles relatively independently. Based on the interaction between association rules and time, we employ a new technique called cycle pruning, which reduces the amount of time needed to find cyclic association rules. A second algorithm, the interleaved algorithm, uses cycle pruning and other optimization techniques for discovering cyclic association rules with reduced overhead.
    Type: Grant
    Filed: February 16, 1999
    Date of Patent: August 21, 2001
    Assignee: Lucent Technologies, Inc.
    Inventors: Banu Ozden, Sridhar Ramaswamy, Abraham Silberschatz
  • Patent number: 6262678
    Abstract: A/D conversion of a current input is performed with integrate-and-fire spiking neurons. Techniques that upcount or downcount the number of spikes fired by one neuron in a time period established by another neuron yield quantized estimates of analog charge residues created by the input current. Recursive application of alternate upcounting and downcounting operations yields successively finer quantization estimates that are terminated by an error-correction operation to obtain the least significant bit of the conversion. A spike-based hybrid state machine (HSM) employing both analog and digital elements is configured to create a 2-step or a successive-subranging analog-to-digital converter. The speed of the conversion is augmented in a pipelined topology. In the HSM, a spike-triggered finite state machine (FSM) controls the input currents to the spiking neurons and is in turn controlled by spikes arising from these neurons.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: July 17, 2001
    Assignee: Lucent Technologies Inc.
    Inventor: Rahul Sarpeshkar
  • Patent number: 6242974
    Abstract: A stable, reliable, op-amp circuit overcomes the adverse affect of input offset voltages, VOSI, present at the input of op-amp. In one application, such VOSI-compensated op-amps employ a standard bandgap voltage input to achieve an improved voltage regulated reference source. A new circuit combination includes an auto-zero circuit arrangement intermediate an input network and the op-amp exhibiting the input voltage offset. In an auto-zero mode, the new auto-zero circuit arrangement samples the op amp's VOSI and redistributes the sampled signal in a storage network for use in compensating for the VOSI while operating in a normal mode. As the potential for VOSI problems again develops, another auto-zero pulse causes the circuit arrangement to switch again to the auto-zero mode and the cycle continues. Because the auto-zero arrangement employs the actual VOSI encountered in a specific op-amp, and that value for VOSI is used to null the error-causing input, the circuit arrangement is self-calibrating.
    Type: Grant
    Filed: August 2, 1999
    Date of Patent: June 5, 2001
    Assignee: Micrel,Inc
    Inventor: David J. Kunst
  • Patent number: 6242988
    Abstract: A spiking neuron circuit providing a spiking output signal in response to an input current that causes a first capacitor to charge to a threshold voltage. In response to achieving such threshold, an output terminal is connected to a voltage, illustratively VDD, for a period determined by an applied voltage, Vpw. Rapid switching of the output to its spiking level is achieved using a positive feedback path, and deactivation of such feedback rapidly terminates the spiking period.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: June 5, 2001
    Assignee: Lucent Technologies Inc.
    Inventor: Rahul Sarpeshkar
  • Patent number: 6212548
    Abstract: A plurality of users communicate in a plurality of real-time text conversations (e.g., “chat sessions”) in a client-server message processing environment using messages including a conversation index, a conversation-initiator ID and a list of message recipients. Each conversation is maintained at client terminals in an individual window. Dropping and controlled adding of conversation participants is attended by message updates to other participants. Alternative peer-to-peer message handling reduces the processing burden on servers while allowing clients to perform control and display functions. Voice or other non-text messages are also communicated using described techniques.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: April 3, 2001
    Assignee: AT & T Corp
    Inventors: Antonio DeSimone, Elizabeth A. Hohne, Rangamani Sundar, Vishwanathan Thiagarajan, Kumar K. Vishwanathan
  • Patent number: 6167162
    Abstract: A new method for real time implementation of rate-distortion optimized coding mode selection is disclosed that can be efficiently applied to H-263-compatible video codecs and other codecs of similar type. A normalized rate-distortion model is used to efficiently compute the rate and the distortion when encoding motion-compensated prediction error signals, instead of performing DCT, quantization and entropy-encoding. A fast algorithm is also disclosed that determines sub-optimal values of coding parameters such as the quantization parameter and the Lagrangian multiplier, .lambda., for the trellis search. Very good rate control and picture quality are achieved, especially when the disclosed techniques are applied in very low bitrate video coding.
    Type: Grant
    Filed: October 4, 1999
    Date of Patent: December 26, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Arnaud Eric Jacquin, Kyeong Ho Yang
  • Patent number: 6167427
    Abstract: A system an method for efficiently providing access by a large number of clients to objects located at a large number of information servers. A non-bottleneck solution is provided to sharing load among servers by migrating or replicating objects over from highly loaded servers to less highly loaded servers. Objects that experience low loading are deleted to make room for more highly used objects and to permit make space for new objects. A naming service is provided to provide rapid access to a replica of a requested objects, while avoiding directing access requests to servers from which replicas of requested objects have been deleted. Hierarchical ordering of replication and naming functions permits a variety of particular access methods to be realized.
    Type: Grant
    Filed: November 28, 1997
    Date of Patent: December 26, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Irina Rabinovich, Michael Rabinovich
  • Patent number: 6081590
    Abstract: A method for implementing call-gapping controls in a telecommunications system supporting ported directory numbers comprises receiving control messages at switches and other network elements, which messages include information relating to the type of controls and parameter information for one or more options permitting present or downstream local number portability (LNP) queries. Based on such received control information, a switch or other network entity seeks to process the call toward completion using dialed number and/or corresponding LNP information, or cancel the call in the interest of overall network efficiency. Use of traffic information allows system operators and network databases to impose policies and practices such as use of dialed number for routing notwithstanding the availability of location routing number information.
    Type: Grant
    Filed: February 2, 1998
    Date of Patent: June 27, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Joseph L. Crowley, Garry D. Nelson, Richard S. Wetmore