Patents Examined by Steven Nguyen
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Patent number: 5970061Abstract: A transmission space diversity method which is effective also for a communication system wherein different carrier frequencies are used for transmission and reception is disclosed. Such reception space diversity control that a controlling signal from terminal station 10 is received by two antennas 1 and 2 and receivers 3 and 4 of a base station and the two received controlling signals are compared with each other by reception space diversity controlling signal generation circuit 6 and then that signal which exhibits a higher reception level is provided to switch circuit 8. Furthermore, the reception space diversity controlling signal is utilized for transmission space diversity control of antenna selection wherein the output of transmitter 5 is emitted by one of the antennas.Type: GrantFiled: February 25, 1997Date of Patent: October 19, 1999Assignee: NEC CorporationInventor: Junichi Kokudo
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Patent number: 5963542Abstract: A method for estimating the cell loss rate of an asynchronous transfer mode statistical multiplexer comprises the steps of finding a multiplexer state probability distribution and estimating the cell loss rate from the multiplexer state probability distribution.Type: GrantFiled: September 3, 1996Date of Patent: October 5, 1999Assignee: The United States of America as represented by the Secretary of the NavyInventor: Allen Shum
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Patent number: 5956344Abstract: A method and system of enabling intra-system communication between first and second microprocessors in an asynchronous transfer mode (ATM) environment includes emulating ATM segmentation and reassembly at the first microprocessor. The second microprocessor is connected to circuitry for supporting ATM communications with other systems. With respect to an inter-processor communication (IPC) from the first microprocessor to the second microprocessor, conventional ATM segmentation is emulated at the first microprocessor, thereby forming fixed-length cells having payloads representative of the IPC. ATM-compatible header information is attached to each one of the cells and transferred to the circuitry, which typically includes a segmentation and reassembly (SAR) device. The circuitry reassembles the message and forwards the IPC to the second microprocessor.Type: GrantFiled: February 3, 1997Date of Patent: September 21, 1999Assignee: Siemens Information and Communication Networks, Inc.Inventor: Steven R. Cole
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Patent number: 5943331Abstract: A cellular radio system in which a base station receiver can receive, on the reverse link, data from a mobile terminal in one of four control modes. In the first mode, the mobile terminal sends an independent user pilot, not synchronized with the base station, on the reverse link and the user data channel is synchronized to this independent user pilot. In the second mode, the mobile terminal slaves its user pilot to the pilot it receives from the base station and the user data channel is synchronized with this slaved user pilot. This second mode allows the user terminal to receive round trip delay information for purposes of geolocation and rapid reacquisition. In the third mode, the mobile terminal slaves its user pilot to the incoming base station pilot, as in the case of mode two, but the user data channel operates in the orthogonal mode using the ranging information received from the base station. The phase relationship between the user pilot channel and the user data channel is calibrated.Type: GrantFiled: February 28, 1997Date of Patent: August 24, 1999Assignee: Interdigital Technology CorporationInventor: Gil Lavean
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Patent number: 5940396Abstract: A novel method of routing and performing autoconfiguration in an ATM network is disclosed. The method simplifies the configuration and routing for ATM networks having a relatively large number of nodes. Networks are constructed in hierarchical fashion in the form of branches and trees and assigned network address prefixes in accordance with their location in the network. Network nodes periodically exchange identification information permitting both switches on either side of a link to be aware of who they are connected to. Each node registers a network address and its associated significant length for each of its neighbors on each of its links. A node performs routing by comparing the destination address against each of its registered addresses for all its links. The routing method takes advantage of the network address prefix to ensure that the routing proceeds in the correct direction towards the destination and does not enter a tree or a branch that does not contain the destination.Type: GrantFiled: August 21, 1996Date of Patent: August 17, 1999Assignee: 3COM LTD.Inventor: Haim Rochberger
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Patent number: 5940369Abstract: A unique simple and generic ABR-MAC interoperability approach is employed which minimizes the impact of a Host Digital Terminal (HDT) ATM switch ABR connection on individual Information Appliances (IAs present at customer premises) and by employing a suitable MAC protocol to transfer data to an ATM network interface buffer (ATM-NI) located at the HDT. To this end, a unique arrangement is employed to regulate the buffer storage unit status in an ATM-NI. More specifically, the arrangement monitors upstream data traffic from active IA-HDT connections and, additionally, any incipient IA-HDT connections. This is realized by employing dual ATM-NI buffer storage unit threshold values that are selected depending on a particular ATM-NI buffer storage providing the particular information appliance on an active connection with information to allow the information appliance to adjust its transmission unit capacity, namely, a low, i.e., first, threshold value and a high, i.e., second, threshold value.Type: GrantFiled: March 26, 1997Date of Patent: August 17, 1999Assignee: Lucent Technologies Inc.Inventors: Vijay K. Bhagavath, Curtis A. Siller, Jr.
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Patent number: 5936964Abstract: Data packets are transmitted in forward and backward directions via a multiplexed communications medium, wherein each of the data packets is associated with a corresponding one of a plurality of connections. Transmission is performed by, for each connection, assigning a forward delay limit and a corresponding backward delay limit, wherein the sum of the forward and backward delay limits is equal to a round-trip delay bound for the connection. The assigned forward delay limits are used to determine the order in which the data packets supplied by the plurality of connections will be transmitted in the forward direction. Similarly, the assigned backward delay limits are used to determine the order in which the data packets supplied by the plurality of connections will be transmitted in the backward direction.Type: GrantFiled: April 18, 1997Date of Patent: August 10, 1999Assignee: Telefonaktiebolaget LM EricssonInventors: Andras Valko, Lars Westberg
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Patent number: 5930264Abstract: A protocol initialization message is generated by an originating node of a communications network for transmission to each of its cooperating nodes in the network. This message identifies the communications protocols and capabilities (industry standardized and proprietary) supported by the originating node. Responsive to the protocol initialization message, cooperating nodes operate to update their data matrices storing protocol and capability information for the originating node, and generate a protocol initialization response for transmission back to the originating node. This response identifies the communications protocols and capabilities (industry standardized and proprietary) supported by the cooperating node. Responsive to the protocol initialization response, the originating node operates to update its data matrix storing protocol and capability information for the cooperating nodes.Type: GrantFiled: February 6, 1997Date of Patent: July 27, 1999Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventor: Viet Nguyen
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Patent number: 5926456Abstract: An ATM path changing system and method for use in an ATM communication apparatus and ATM communication network are provided which can set an alternating route in the event of a failure occurring in a transmission line or VP. A header converter in a line controller includes a plurality of output path routing tables, a selector, a comparator, a register for failure RTG and a register for failure VPI and when the contents of the register for failure RTG or VPI coincides with a RTG or VPI of the output path routing tables, an output is selected in accordance with the contents of a selected emergency-route RTG or VPI register.Type: GrantFiled: November 6, 1996Date of Patent: July 20, 1999Assignee: Hitachi, Ltd.Inventors: Masataka Takano, Yoji Oka, Akihiko Takase, Setsuo Takahashi
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Patent number: 5923646Abstract: A method for finding or routing a ring containing predetermined ring offices of a communications network while minimizing costs of communications channels used to route the ring. The ring may be a self-healing ring, the communications channels may be optical communications channels, the costs may be fiber transport costs and the network may be a SONET network.Type: GrantFiled: August 30, 1996Date of Patent: July 13, 1999Assignee: Nynex Science & TechnologyInventor: Indur B. Mandhyan
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Patent number: 5923663Abstract: A media detection system that detects an external device coupled to a port of a network device and that establishes a working communication link. The media detection system includes a port connector including first and second contact sets and a physical layer device which includes a transmit output and a receive input. The physical layer device monitors its receive input for communication signals and provides a link detect signal indicative thereof. The media detection system further includes a select circuit that selectively couples the transmit output and the receive input of the physical layer device to the first and second contact sets, respectively, of the port connector in a first state and crosses the connection in a second state.Type: GrantFiled: March 24, 1997Date of Patent: July 13, 1999Assignee: Compaq Computer CorporationInventors: Evan J. Bontemps, Louis R. Gagliardi
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Patent number: 5923669Abstract: The fitting of boundary buffers on the exit from a telecommunications network can greatly reduce the relative wander. Adaptive boundary buffers have a phase adjusting circuit, for determining the phase error between a recovered line clock and a recovered return clock from receiving equipment of a telecommunications system, the phase of the recovered return clock being advanced or retarded by the value of the phase error and the phase of the recovered line clock being retarded or advanced respectively by less than the value of the phase error, so as to produce a phase adjusted Output Line Clock.Type: GrantFiled: October 22, 1996Date of Patent: July 13, 1999Assignee: GPT LimitedInventor: Geoffrey Chopping
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Patent number: 5923664Abstract: The invention discloses a method and an apparatus for implementing the physical interface in a network element connected to a packet network such as Asynchronous Transfer Mode (ATM) network. With the solution of the invention, the physical interface functions can be integrated on one chip for more than one network port. The physical interface is provided between port bit streams at media speed and word data flow transferred onto/from a bus which is under the control of the network equipment. The solution of the invention includes grouping logics and storage elements by islands of more than one port. Furthermore, the logics and storage elements for statistical counting operations can be grouped for a processing generalized to all ports.Type: GrantFiled: March 27, 1997Date of Patent: July 13, 1999Assignee: International Business Machines CorporationInventors: Jean-Paul Aldebert, Jean Calvignac, Daniel Orsatti, Fabrice Verplanken, Jean-Claude Zunino
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Patent number: 5917804Abstract: In an ATM network, the physical resources are shared by many connection and the bandwidth is allocated virtually to each connection. The connection admission control (CAC) algorithm uses traffic descriptors, desired quality of service (QOS) parameters etc., to compute a required bandwidth for a requested connection by which it makes a decision to admit or reject the connection. For admission control for a requested VBR connection, two required bandwidths are calculated in two different ways, both of which take into consideration impacts of CBR traffic which is being serviced. The admission decision is based on the lesser of the two bandwidths.Type: GrantFiled: September 5, 1996Date of Patent: June 29, 1999Assignee: Northern Telecom LimitedInventors: Syed I. A. Shah, Kun Qian, Todd D. Morris
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Patent number: 5912879Abstract: The present invention relates to a broadband terminal equipment for congestion control in the ring structure and its control method, and the object of the invention is to prevent ATM traffic congestion which can be produced in the ring in order to realize the ATM subscriber premises network having a ring structure.Type: GrantFiled: April 30, 1997Date of Patent: June 15, 1999Assignees: Electronics and Telecommunications Research Institute, Korea TelecomInventors: Young-Wook Cha, Jong-Oh Kim, Ik-Kyun Kim, Kyou-Ho Lee, Jong-Arm Jun
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Patent number: 5907550Abstract: In order to interface diverging paging networks, a gateway is established which includes a rules engine for applying rules to received packets. Each rule includes matching, modifying and routing elements for identifying and handling received paging packets. When a packet is received, it is first determined if the packet is matched to a first, matching element of one of a set of previously established rules. If, the packet is matched to the first element of a given rule, it is modified in accordance with the second element of the given rule and forwarded in accordance with the third element of the given rule. However, if the received packet is not matched to a matching element of any of the rules, a default rule is applied during the modification and forwarding procedures. User invokable procedures are provided by which rules can be modified or new rules can be added.Type: GrantFiled: September 9, 1996Date of Patent: May 25, 1999Assignee: TekNow, Inc.Inventor: Steven M. Hontz
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Patent number: 5905714Abstract: A method for rerouting a packet-mode data connection, especially a frame relay network data connection, in which, traffic transmitted between two nodes is transferred from a first route to be disabled to a second, new route. In a rerouting situation, data packets to be transmitted to a new route are buffered, when needed, in a transmitter in order to perform checking concerning the route or to ensure the correct order of the data packets. In order to accomplish rerouting as fast as possible and with a minimum loss of data, the opposite end is notified of the need for buffering by sending a message, the contents of which depend on the rerouting situation in question.Type: GrantFiled: August 26, 1996Date of Patent: May 18, 1999Assignee: Nokia Telecommunications OyInventor: Klaus Havansi
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Patent number: 5905730Abstract: A packet scheduler is disclosed which provides a high degree of fairness in scheduling packets associated with different sessions. The scheduler also minimizes packet delay for packet transmission from a plurality of sessions which may have different requirements and may operate at different transfer rates. When a packet is received by the scheduler, the packet is assigned its own packet virtual start time based on whether the session has any pending packets and the values of the virtual finish time of the previous packet in the session and the packets arrival time. The scheduler then determines a virtual finish time of the packet by determining the transfer time required for the packet based upon its length and rate and by adding the transfer time to the packet virtual start time of the packet. The packet with the smallest virtual finish time is then scheduled for transfer.Type: GrantFiled: March 27, 1998Date of Patent: May 18, 1999Assignee: Ascend Communications, Inc.Inventors: Tao Yang, Mahesh N. Ganmukhi
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Patent number: 5903556Abstract: In a code multiplexing communication system, a transmission apparatus includes a code generator, a signal distribution unit, spreading units, a synthesizer, and a modulator, and a reception apparatus includes a correlator, an equalizer, demodulators, and a coupler. The code generator generates n spreading code series which are generated at timings different from the timing of a predetermined spreading code. The signal distribution unit divides a serial input signal having n.times.m bits per symbol timing into n parallel signals each consisting of m bits. The spreading units respectively spectrum-spread the n m-bit output signals by using the n output signals from code generator. The synthesizer synthesizes the output signals from the spreading units. The modulator modulates the output signal from the synthesizer. The correlator calculates the correlation between a baseband signal and the spreading code.Type: GrantFiled: November 27, 1996Date of Patent: May 11, 1999Assignee: NEC CorporationInventor: Hitosi Matui
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Patent number: 5903554Abstract: The present invention is a method and apparatus for providing a received signal quality metric which is optimally designed to control the transmission power of a transmitter in a closed loop power control system. The present invention is described in the context of a spread spectrum communication system but it is equally applicable to other types of communication systems. In the present invention, the power control system is described for controlling the power of transmissions from a base station to a mobile station, referred to as forward link transmissions.Type: GrantFiled: September 27, 1996Date of Patent: May 11, 1999Assignee: Qualcomm IncorporationInventor: Keith W. Saints