Patents Assigned to Nortel Networks
  • Patent number: 8027315
    Abstract: The invention is directed to a method of communicating between a first transceiver including a plurality of antennas and a second transceiver, the method comprising the steps of: transmitting a signal from the first transceiver to said second transceiver using each of the plurality of antennas of the first transceiver; at the second transceiver, selecting one of the plurality of antennas for use; and communicating between the two transceivers using this selected antenna. The invention is also directed to apparatus and software for performing the methods.
    Type: Grant
    Filed: October 10, 2003
    Date of Patent: September 27, 2011
    Assignee: Nortel Networks Limited
    Inventors: Andrew Urquhart, Simon Gale
  • Patent number: 8027417
    Abstract: A level of interference affecting signal components of received communication signals is estimated and used to weight the signal components. The signal components in a each of a number of groups of signal components are weighted based on respective interference estimates to thereby adjust signal components for colored interference, which may vary significantly between different groups of signal components. Each group of signal components may include a single component or components within a relatively narrow sub-band of the communication signals, such as a coherence bandwidth of an Orthogonal Frequency Division Multiplexing (OFDM) signal.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: September 27, 2011
    Assignee: Nortel Networks Limited
    Inventors: Ming Jia, Wen Tong, Dong-Shen Yu
  • Patent number: 8028227
    Abstract: The present invention provides a method, apparatus, processor-readable medium and signals for building a presentation by receiving user input identifying multimedia content to be included in a presentation and copying multimedia content identified by such user-input from a multimedia source to memory, for access by a presentation application. Copying may involve copying multimedia content from an application while the application is using the multimedia content. There is also provided a method, apparatus, processor-readable medium and signals for providing a presentation by identifying multimedia content previously identified by a user as to be included in the presentation and accessing and presenting at least some of the multimedia content previously identified by the user.
    Type: Grant
    Filed: March 31, 2000
    Date of Patent: September 27, 2011
    Assignee: Nortel Networks Limited
    Inventors: Laura L. Mahan, Kelly K. Forbes, Shaun Illingworth
  • Publication number: 20110230167
    Abstract: A method and system of delivering a Multimedia Messaging Service (MMS) message is disclosed. In one example, the method includes providing a storage location and time duration for outside content to be indirectly referenced by an MMS message. Receiving and storing the outside content via a transport network is also disclosed. The method may include encapsulating an MMS message in a payload of a transport message with the MMS message indirectly referencing the storage location of the outside content. Delivery of the transport message may occur over a transport network. Confirming receipt of the transport message is also disclosed.
    Type: Application
    Filed: May 27, 2011
    Publication date: September 22, 2011
    Applicant: Nortel Networks Limited
    Inventors: Jayshree Bharatia, Marvin Bienn, Kuntal Chowdry
  • Publication number: 20110227664
    Abstract: The present invention is a hybrid RF-digital signal processor-based filter for multiband radio architectures systems capable of spectrum re-farming and software defined radios. It performs low-loss frequency agile multiple notch filtering at RF where a large dynamic range exists at a filter input between signals in a stopband and passband. It is a frequency dependent signal attenuation apparatus having two paths connected together by directional couplers. The first path comprising a component such as a delay component or duplexer. The second path comprising a bandstop filter connected to a down converter, a digital filter, and an up converter. At the output of a power amplifier, the invention can be used to attenuate spurs, or noise within bands with strict emission constraints. At the input of a low noise amplifier, the invention can be used to attenuate blockers and transmitter noise outside of the receiver passband.
    Type: Application
    Filed: November 26, 2009
    Publication date: September 22, 2011
    Applicant: Nortel Networks Limited
    Inventor: Mark Wyville
  • Publication number: 20110227665
    Abstract: The present invention is a hybrid RF-digital signal processor-based filter for multiband radio architectures, systems capable of spectrum re-farming and software defined radios It performs low-loss frequency agile multiple notch filtering at RF where a large dynamic range exists at a filter input between signals in a stopband and passband It is a frequency dependent signal attenuation apparatus having two paths connected together by directional couplers The first path comprising a component such as a delay component or duplexer The second path comprising, in series, a down converter, a digital filter, an up converter, and a bandstop filter At the output of a power amplifier, the invention can be used to attenuate spurs, or noise within bands with strict emission constraints At the input of a low noise amplifier, the invention can be used to attenuate blockers and transmitter noise outside of the receiver passband.
    Type: Application
    Filed: November 26, 2009
    Publication date: September 22, 2011
    Applicant: Nortel Networks Limited
    Inventor: Mark Wyville
  • Patent number: 8024457
    Abstract: Methods and devices for logically segmenting an LSP so that OAM DTUs may be used to determine the performance and/or the status of LSP segments. To segment a previously determined LSP, a dedicated subpath (a logical LSP) within that predetermined LSP is defined between two LSRs that are capable of processing OAM DTUs. The source node (source LSR) establishes a logical LSP between itself and the destination node (destination LSR) using an LDP. In doing this, the logical LSP traverses a specific path and transits through specific nodes in that path. The source node then transmits an OAM DTU or any other specialized DTU to the destination node using a label specifically associated with the logical LSP that was established. The characteristic of the specific path traversed by the logical LSP can thus be determined by when, how, and if the specialized DTU is received by the destination node.
    Type: Grant
    Filed: April 28, 2008
    Date of Patent: September 20, 2011
    Assignee: Nortel Networks Limited
    Inventor: Mina Azad
  • Patent number: 8024641
    Abstract: A method for constructing a low-density parity-check (LDPC) code using a structured base parity check matrix with permutation matrix, pseudo-permutation matrix, or zero matrix as constituent sub-matrices; and expanding the structured base parity check matrix into an expanded parity check matrix. A method for constructing a LDPC code using a structured base parity check matrix H=[Hd|Hp], Hd is the data portion, and Hp is the parity portion of the parity check matrix; the parity portion of the structured base parity check matrix is such so that when expanded, an inverse of the parity portion of the expanded parity check matrix is sparse; and expanding the structured base parity check matrix into an expanded parity check matrix. A method for encoding variable sized data by using the expanded LDPC code; and applying shortening, puncturing.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: September 20, 2011
    Assignees: Nortel Networks Limited, Nortel Networks Inc.
    Inventors: Michael Livshitz, Aleksandar Purkovic, Nina Burns, Sergey Sukhobok, Muhammad Chaudhry
  • Patent number: 8024474
    Abstract: A Multicast-Enabled Address Resolution Protocol (ME-ARP) is disclosed. This ME-ARP allows the building of independent IP based Virtual Private LAN segments (VPLS) over a multicast enabled IP backbone using stateless tunnels and optimal VPLS traffic forwarding. Each VPLS has an associated IP subnet which is completely independent from other VPLS or the underlying IP backbone itself. Each Customer Premises Equipment (CPE) device needs only to be configured with a VPLS identifier and its serving IP subnet per VPLS designated interface.
    Type: Grant
    Filed: March 24, 2010
    Date of Patent: September 20, 2011
    Assignee: Nortel Networks Limited
    Inventors: Marcel Wiget, Robert Pluim, Simon David Blyden, Geoffrey Mattson
  • Patent number: 8023985
    Abstract: A method and apparatus of establishing a connection between a wireless device and a second device includes maintaining a state of the connection between the wireless device and the second device, and receiving an indication that a wireless link to the wireless device has been lost or may be lost. In response to the receiving the indication that the wireless link to the wireless device has been lost or may be lost, the state of the connection is transitioned from a first state to a second state.
    Type: Grant
    Filed: June 7, 2004
    Date of Patent: September 20, 2011
    Assignee: Nortel Networks Limited
    Inventors: Helge Szwerinski, Nicolas S Dade, Vibhu Vivek, Kumara Das Karunakaran
  • Patent number: 8022768
    Abstract: An amplifier having a Doherty-type architecture and a method for operation thereof are provided. The amplifier comprises a main amplifier path comprising a main amplifier, an auxiliary amplifier path comprising an auxiliary amplifier, and an signal preparation unit configured to develop a main amplifier input signal for the main amplifier path and an auxiliary amplifier input signal for the auxiliary amplifier path based on an amplifier input that is to be amplified and a transition threshold associated with the amplifier input. By driving the main and auxiliary amplifiers as a function of the transition threshold, the gain of the Doherty-type amplifier may be increased.
    Type: Grant
    Filed: June 10, 2009
    Date of Patent: September 20, 2011
    Assignee: Nortel Networks Limited
    Inventors: Gregory J. Bowles, Scott Widdowson
  • Publication number: 20110222637
    Abstract: A method and apparatus for reducing the contribution of noise to digitally sampled signals includes a statistical processor and a slope limiter. The statistical processor determines an average value (mean and/or standard deviation) of the filtered signal which is used to determine a slope limit corresponding to an expected maximum first derivative value of a target signal frequency. This slope limit is applied to constrain the output of an analog to digital converter, to prevent the output of the analog to digital converter from exceeding this maximum rate of rise or fall. By constraining the output of the analog to digital converter, it is possible to digitally sample analog signals without first utilizing an anti-aliasing filter, since the post processing of the digitally sampled signals limits the contribution of the higher frequency components of the signal to thereby enable a fully digital sampling and filtering circuit to be provided for receiving signals.
    Type: Application
    Filed: March 10, 2010
    Publication date: September 15, 2011
    Applicant: Nortel Networks Limited
    Inventors: Jonathan Davey, Russell Jones
  • Publication number: 20110221865
    Abstract: A server process renders instances of a 3D virtual environment as video streams that may then be viewed on devices not sufficiently powerful to implement the rendering process natively or which do not have native rendering software installed. The server process is broken down into two steps: 3D rendering and video encoding. The 3D rendering step uses knowledge of the codec, target video frame rate, size, and bit rate from the video encoding step to render a version of the virtual environment at the correct frame rate, in the correct size, color space, and with the correct level of detail, so that the rendered virtual environment is optimized for encoding by the video encoding step. Likewise, the video encoding step uses knowledge of motion from the 3D rendering step in connection with motion estimation, macroblock size estimation, and frame type selection, to reduce the complexity of the video encoding process.
    Type: Application
    Filed: May 19, 2011
    Publication date: September 15, 2011
    Applicant: Nortel Networks Limited
    Inventor: Arn Hyndman
  • Patent number: 8019343
    Abstract: The invention supports two types of handoffs. The first handoff is for an inter-AN cell selection where the source AN allows the AT to add a cell under the control of a different AN to its active set and then allows the AT to switch to the target AN. A bearer path is established between the source and target AN to transfer the packet data traffic using an exchange of messages to register the AT's movement from one BTS to another BTS. The A8/A10 connections remain anchored at the source AN and, hence, a bearer path is needed between the source and target AN to transfer the packet data traffic. The second handoff occurs when the source AN specifies a move of the AT to a new AN proactively. New connections are established at the target AN to support the AT, and the AT is subsequently moved to the target AN via the relevant air-interface messaging.
    Type: Grant
    Filed: May 5, 2009
    Date of Patent: September 13, 2011
    Assignee: Nortel Networks Limited
    Inventors: Surya Tenneti, Sanket Nesargi, Jun Li
  • Patent number: 8019841
    Abstract: Described are a system and method for establishing zone-based pricing for services transported over connectionless and connection-oriented networks. The connectivity network supporting the service is partitioned into one or more zones. A node connected to a packet transport network receives a packet associated with the service. The packet has information that is used to identify one of the zones of the connectivity network to which the packet can be transmitted. Service providers are thus able to use zoning to apply a pricing structure for services traditionally lacking distance-based pricing, such as Ethernet, Storage, and Internet Protocol services.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: September 13, 2011
    Assignee: Nortel Networks Limited
    Inventors: Donald Russell Ellis, Martin Charbonneau
  • Patent number: 8018975
    Abstract: A method and apparatus are provided for performing acquisition, synchronization and cell selection within an MIMO-OFDM communication system. A coarse synchronization is performed to determine a searching window. A fine synchronization is then performed by measuring correlations between subsets of signal samples, whose first signal sample lies within the searching window, and known values. The correlations are performed in the frequency domain of the received signal. In a multiple-output OFDM system, each antenna of the OFDM transmitter has a unique known value. The known value is transmitted as pairs of consecutive pilot symbols, each pair of pilot symbols being transmitted at the same subset of sub-carrier frequencies within the OFDM frame.
    Type: Grant
    Filed: October 2, 2006
    Date of Patent: September 13, 2011
    Assignee: Nortel Networks Limited
    Inventors: Jianglei Ma, Ming Jia, Peiying Zhu, Wen Tong
  • Patent number: 8018304
    Abstract: Some embodiments of the invention provide a filter having at least one first filter, each first filter being a band-reject type filter having a first set of filter parameters that are a function of a first material used to fabricate the at least one first filter, and at least one second filter, each second filter having a second set of filter parameters that are a function of a second material used to fabricate the at least one second filter, each second filter being one of a band-reject type filter and a band pass type filter. The at least one first filter and the at least one second filter are then cascaded together to form the filter. The first material and the second material are different materials. The cascaded filter has a new third set of filter parameters that are a function of both the first material and the second material. Other embodiments of the invention include a method for fabricating the filter and a method of filtering using such a cascaded filter.
    Type: Grant
    Filed: April 15, 2009
    Date of Patent: September 13, 2011
    Assignee: Nortel Networks Limited
    Inventor: Chun-Yun Jian
  • Patent number: 8014377
    Abstract: A mobile terminal in a wireless communication network may be one of several modes of operation. When in an idle mode, the mobile terminal may avoid a lengthy random access procedure normally associated with responding to a page from a base station, if the base station includes in the page an indication of a resource that the mobile terminal may utilize when responding to the page. Additionally, the mobile terminal may transmit an efficient location update MAC header to a base station, whether prompted to by a page from the base station or not. Furthermore, without leaving the idle mode or a sleep mode, the mobile terminal may exchange short data burst messages with a base station.
    Type: Grant
    Filed: June 27, 2005
    Date of Patent: September 6, 2011
    Assignee: Nortel Networks Limited
    Inventors: Hang Zhang, Mo-Han Fong, Peiying Zhu, Wen Tong
  • Publication number: 20110211462
    Abstract: A system and method for scheduling cooperative uplink transmissions a virtual multiple input multiple output (MIMO) wireless communication environment are provided. More specifically, both random and channel aware orthogonal scheduling techniques for identifying a sub-set of N mobile terminals to provide cooperative uplink transmissions for each transmit time interval are provided.
    Type: Application
    Filed: May 9, 2011
    Publication date: September 1, 2011
    Applicant: Nortel Networks Limited
    Inventors: Jianming Wu, Ming Jia, Wen Tong, Peiying Zhu
  • Patent number: 8010794
    Abstract: In a system comprising a broadcasting subsystem and a radiocommunication subsystem each connected to a mediation platform, said transmission being ciphered and arranged for being deciphered by using a key, the following steps are performed at the mediation platform, relatively to a user or group of users having terminals: determining one first and at least one second sets of values from said key, so that the knowledge of all the determined sets of values is required to retrieve the key; and controlling the broadcasting subsystem so that it transmits the first set of values to the user or group of users and the radiocommunication subsystem so that it transmits the at least one second set of values to the user or group of users.
    Type: Grant
    Filed: June 27, 2006
    Date of Patent: August 30, 2011
    Assignee: Nortel Networks Limited
    Inventor: Thierry Lucidarme