Patents Assigned to Nortel Networks Limited
  • Patent number: 8718057
    Abstract: Numerous enhancements to metro Ethernet network (MEN) ELAN services and IETF Virtual Private LAN Service (VPLS) include an enhancement of the overall Quality of Service (QoS) architecture, an enhancement to classification at the provider edge, the use of Ethernet QoS classes, enhancements to policing and marking at ingress provider edge equipment, the provision of traffic management functions at egress provider edge equipment, the use of multiple Ethernet virtual connections (EVCs) and Aggregate EVCs, an enhancement to QoS across an external network-network interface and an enhancement to treatment of Ethernet service frames in a core network.
    Type: Grant
    Filed: December 30, 2004
    Date of Patent: May 6, 2014
    Assignee: Nortel Networks Limited
    Inventors: Sameh Rabie, Osama Aboul-Magd
  • Patent number: 8305913
    Abstract: An apparatus (1240), method, and computer program to assess VoIP speech quality (130) using access to degraded signals is provided. Different types of impairment (110) have different effect, on speech quality. Preferred embodiments address up to four different types of impairment that affect VoIP signal quality: packet loss (230), speech clipping in time (850), noise (1400) and echo. An overall assessment algorithm factors in degradation due to various impairment factors to generate an overall speech quality assessment score or value.
    Type: Grant
    Filed: June 15, 2006
    Date of Patent: November 6, 2012
    Assignee: Nortel Networks Limited
    Inventors: Mohamed El-Hennawey, Rafik Goubran, Ayman M. Radwan, Lijing Ding
  • Patent number: 8291044
    Abstract: A method of brokering a network resource. The method includes providing a service broker processor and a service broker registry. Upon receiving a request at the service broker processor to register a network resource to provide a network service, the service broker processor authenticates the request and authorizes registration in the service broker registry. A network client is updated with the availability of the registered network resource so that on receiving a third party request for the network service, the network client requests allocation of the registered network resource. A bearer path is set up between the third party and the network resource to provide the requested network service.
    Type: Grant
    Filed: October 13, 2004
    Date of Patent: October 16, 2012
    Assignee: Nortel Networks Limited
    Inventor: John Storrie
  • Publication number: 20120225686
    Abstract: A push to talk message protocol operating on a communication network between an originating and terminating communication device operates to transmit compressed message formats to initiate the push to talk message protocol. Four compressed session protocol message formats are used in the preferred embodiment. A compressed originating session initiation invite message is transmitted from the originating mobile station. A compressed terminating session initiation invite message is received by the terminating mobile station. A compressed session initiation protocol ping message is transmitted from the originating mobile station and received by the terminating mobile station. A compressed 200 OK session initiation protocol message is transmitted from the terminating mobile station and received by the originating mobile station. Finally, the originating mobile decompresses the 200 OK session initiation protocol message. These compressed messages are used to initiate the push to talk communication session.
    Type: Application
    Filed: April 11, 2012
    Publication date: September 6, 2012
    Applicant: Nortel Networks Limited
    Inventors: Haseeb Akhtar, Anthony Jones
  • Publication number: 20120227101
    Abstract: The present invention supports a method for transmitting information packets across network firewalls. A trusted entity is provisioned with an address designation for a pinhole through the firewall during setup of a communication session between two communication devices. This pinhole address is used throughout the communication session between the two communication devices to transmit information packets onto and out of the communication network. Information packets addressed to the communication device inside the firewall are received by the trusted entity, which replaces address header information in the information packet with the address for the pinhole. The information packet is routed to the pinhole where it passes onto the network for routing to the communication device inside the firewall. Information packets transmitted from the network are also routed to the trusted entity for routing toward the communication device outside the firewall.
    Type: Application
    Filed: April 11, 2012
    Publication date: September 6, 2012
    Applicant: Nortel Networks Limited
    Inventor: Wei Yuan
  • Publication number: 20120207116
    Abstract: Within an access services network (ASN) operable for providing wireless access services to an access terminal and including a base station communicatively coupled to an ASN gateway, a new management protocol is provided for managing the R6 communications. The protocol includes a common set of message types that may be used for data plane, control plane, and individual peer applications communicating over the control plane. In one embodiment, a keepalive procedure or process is used to manage the R6 interface between the ASN gateway and the base station by sending keepalive messages through an established data path tunnel and maintaining one or more keepalive timers.
    Type: Application
    Filed: April 24, 2012
    Publication date: August 16, 2012
    Applicant: NORTEL NETWORKS LIMITED
    Inventors: Zhihong Chen, Randy Kuang
  • Publication number: 20120208533
    Abstract: The present invention provides a system and method to selectively negotiate different delivery styles for different types of packets sent from the Mobile Node to the Foreign Agent, which will allow the Mobile Node to negotiate a delivery style that will permit the Foreign Agent to transmit certain selected outbound traffic directly without reverse tunneling that traffic back to the home network. Specifically, the present invention allows the Foreign Agent to distinguish between certain types of BC/MC packets that are designated to be processed and routed to their destinations by the Foreign Network directly, as opposed to reverse tunneling the outbound traffic from the Foreign Agent back to the Home Agent on the home network. By selecting processing by the Foreign Network, the efficiency of the system will improve because the transmission of outbound traffic and inbound responses will not need to be tunneled through the Home Network.
    Type: Application
    Filed: March 21, 2012
    Publication date: August 16, 2012
    Applicant: Nortel Networks Limited
    Inventors: Ahmad Muhanna, Mohamed Khalil
  • Publication number: 20120201222
    Abstract: A system and method for transitioning connectivity of a mobile node between mobility access gateways on a communication system using an inter-MAG tunneling protocols for a fast handoff. The protocols can use pre-configured or dynamic protocols on the IP-Layer or another layer on the protocol stack. In a hi-directional tunneling mechanism, the protocol and system supports the transfer of the mobility session context information for the mobile node to the next MAG in advance of the fast handoff to avoid delays and an inter-serving gateway bidirectional tunneling mechanism to allow forwarding of the mobility session traffic between new serving gateway and the prior serving gateway without ambiguity.
    Type: Application
    Filed: October 5, 2010
    Publication date: August 9, 2012
    Applicant: Nortel Networks Limited
    Inventors: Ahmad Muhanna, Eric Parsons, Marvin Bienn
  • Publication number: 20120195266
    Abstract: The present invention supports a communication protocol for transmission of information packets between a mobile node and a virtual private network. Information packets are encapsulated and decapsulated along the route as the information packet is forwarded among the various networks on its path to the destination address; either the mobile node on a foreign network or a correspondence node on a virtual private network. A home agent on the virtual private network supports transmitting the information packets, and the information packets are transmitted from the virtual private network from the home agent or a virtual private network gateway.
    Type: Application
    Filed: March 21, 2012
    Publication date: August 2, 2012
    Applicant: Nortel Networks Limited
    Inventors: Mohamed Khalil, Ahmad Muhanna
  • Publication number: 20120195284
    Abstract: Joint uplink processing by plural base stations includes sending, by a serving base station, a request for uplink resources of a second base station for receiving uplink data of a mobile station. The serving base station receives first uplink data from the mobile station, and the serving base station further receives (from the second base station) second uplink data of the mobile station received by the second base station using the uplink resources specified by the request.
    Type: Application
    Filed: October 13, 2010
    Publication date: August 2, 2012
    Applicant: NORTEL NETWORKS LIMITED
    Inventors: Karl D. Mann, Ping Yu, Jianguo Long, Donald Brinkhurst, Roger Mah
  • Publication number: 20120184294
    Abstract: A system and method are provided for enabling a mobile device to establish a local IP access on a packet data network connection on a femto cellular access network. A local server gateway and a macro server gateway are coupled to the femto cellular access network. A mobility management entity is coupled to the femto cellular access network, the local server gateway and the macro server gateway. The mobility management entity obtains a status mode of the mobile device and a location of the mobile device transmitted on the femto cellular access network. The mobility management entity selects one of the local server gateway and the macro server gateway based on the status mode of the mobile device and the location of the mobile device.
    Type: Application
    Filed: May 4, 2010
    Publication date: July 19, 2012
    Applicant: NORTEL NETWORKS LIMITED
    Inventors: Saso Stojanovski, Barnaba Barnowski, Eric Parsons, Gregory Osborne
  • Publication number: 20120180130
    Abstract: A method of defending against a denial-of-service (DoS) attack on an IPv6 neighbor cache includes steps of determining a number of neighbor cache entries currently stored in the neighbor cache and then determining whether the number of entries exceeds a neighbor cache threshold that is less than a neighbor cache limit defining a maximum capacity of the neighbor cache. When the number of entries in the neighbor cache exceeds the neighbor cache threshold, stateless neighbor resolution is triggered. Stateless neighbor resolution entails sending a neighbor solicitation to resolve an address for an incoming packet without logging a corresponding entry in the neighbor cache. Additional techniques that complement the above method involve purging of neighbor cache entries designated as incomplete, prioritization of the entries based on trustworthiness, shortening the incomplete-status timer to less than 3 seconds, and curtailing the number of retransmissions of the neighbor solicitations.
    Type: Application
    Filed: March 15, 2012
    Publication date: July 12, 2012
    Applicant: NORTEL NETWORKS LIMITED
    Inventors: Patrik LAHTI, Michael AALDERS
  • Patent number: 8219076
    Abstract: An access probe existing and generated within a base station to simulate a mobile terminal for the purpose of testing base station receive functionality within a communications system. The access probe data is injected at baseband rather than at RF to eliminate the need for analog/RF circuitry. The access probe performs injection at the front end of the base station receiver to exercise as much receive data path as possible. A unique ID is embedded in the access probes so that the communications system is aware which probes within a sequence were received successfully and at what power level. Within in-field applications, the unique ID allows the communications system to distinguish simulated access probes from those corresponding to real mobiles.
    Type: Grant
    Filed: July 19, 2005
    Date of Patent: July 10, 2012
    Assignee: Nortel Networks Limited
    Inventors: Ganesh Sundararajan, Edward Ken Kiu Mah, Neil McGowan
  • Publication number: 20120163301
    Abstract: A base station sends a request for information relating to radio access technology capabilities of a mobile station. The base station receives a message containing information relating to radio access technology capabilities of the mobile station, where the message is responsive to the request, and the information contained in the message specifies that the mobile station supports at least two different types of radio access technologies useable by the mobile station to communicate over a wireless link between the base station and the mobile station. The base station is able to control which of the at least two different types of radio access technologies the mobile station is to use.
    Type: Application
    Filed: September 14, 2010
    Publication date: June 28, 2012
    Applicant: NORTEL NETWORKS LIMITED
    Inventor: Ke-Chi Jang
  • Publication number: 20120163282
    Abstract: The present invention provides a solution to improve coverage and cell edge performance in a mobile user communication system is the use of fixed relays, which are pieces of infrastructure without a wired backhaul connection. The relays transmit or “relay” downlink messages between the base station (BS) and mobile stations (MSs) through a multi-hop communication. The present invention is a method and system for supporting a multiple user mobile broadband communication network that includes relay techniques suitable for user equipment in the downlink communication to the user equipment.
    Type: Application
    Filed: October 30, 2009
    Publication date: June 28, 2012
    Applicant: NORTEL NETWORKS LIMITED
    Inventors: Hua Xu, Jianglei Ma, Hang Zhang, Ming Jia, Peiying Zhu, Lai King Tee, Jun Li
  • Publication number: 20120151212
    Abstract: The invention is a new protocol for securing the communication link between the Home Agent and the Mobile Node. A cipher key and an integrity key are generated at a home AAA server and are also generated independently at the Mobile Node. The two keys generated at the home AAA server are transmitted to the Home Agent to secure information packets transmitted between the Mobile Node and the Home Agent. The cipher key and integrity key are used to establish a security association used for information packet transmissions. The cipher key is used to encrypt the information packets, and the integrity key is used to ensure that the contents of the encrypted message are not altered.
    Type: Application
    Filed: January 24, 2012
    Publication date: June 14, 2012
    Applicant: Nortel Networks Limited
    Inventors: Kuntal Chowdhury, Anand Palanigounder
  • Publication number: 20120147806
    Abstract: The present invention supports a communication protocol on a wireless communication network to transmit application data on the control channel to an access terminal. Base transceiver stations are grouped and configured into paging zones. The radio network controller transmits a page message and application data to the base transceiver stations in the paging zone where the access terminal is located. Each of the base transceiver stations transmits a page and buffers the application data. The buffered application data is only transmitted by the base transceiver station receiving a response to the page.
    Type: Application
    Filed: February 8, 2012
    Publication date: June 14, 2012
    Applicant: Nortel Networks Limited
    Inventors: Haseeb Akhtar, Krishnakumar Pillai, Hong Ren, Carl Cao
  • Patent number: 8199646
    Abstract: A system, device, and method for distributing link state information in a communication network combines a link state routing protocol with a sliding window mechanism in order to efficiently distribute link state information. The sliding window mechanism permits a predetermined number of unacknowledged link state advertisement protocol messages to be outstanding at any given time. Unacknowledged link state advertisement protocol messages are retransmitted after a predetermined timeout period.
    Type: Grant
    Filed: December 7, 1999
    Date of Patent: June 12, 2012
    Assignee: Nortel Networks Limited
    Inventor: Bradley Cain
  • Publication number: 20120140682
    Abstract: A base station including at least a transceiver switch is provided enabling the base station to transmit and receive data in either FDD or TDD mode from an antenna. The base station may be provided with a synthesiser which can be retuned from FDD to TDD mode or alternatively, an FDD and a TDD synthesiser and a switch enabling the transmitter and receiver of the base station to process FDD or TDD mode data respectively.
    Type: Application
    Filed: December 2, 2010
    Publication date: June 7, 2012
    Applicant: NORTEL NETWORKS LIMITED
    Inventors: Christopher Reed, Simon Gale, Andrew Urquhart
  • Patent number: 8190772
    Abstract: An apparatus and a method for layer-2 and layer-3 VPN discovery are disclosed. The apparatus is incorporated in a network, and the network includes a first carrier network. The first carrier network includes at least two layer-1 provider edge devices. Layer-1 VPN information is created within the first carrier network. BGP next hop information passes within the first carrier network. The BGP next hop information is for a selected one of the following: a layer-2 VPN-based provider edge device, a layer-3 VPN-based provider edge device, and a layer-2 and layer-3 VPN-based provider edge device. The network also includes a second carrier network within which the BGP next hop information is used for VPN discovery.
    Type: Grant
    Filed: December 29, 2003
    Date of Patent: May 29, 2012
    Assignee: Nortel Networks Limited
    Inventor: Hamid Ould-Brahim