公开(公告)号：CA2287686A1

公开(公告)日：2000-06-11

申请号：CA2287686

申请日：1999-10-28

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LA PORTA THOMAS F ,  VARADHAN KANNAN ,  RAMJEE RAMACHANDRAN

IPC: H04L29/06 ,  H04W8/08 ,  H04W8/26 ,  H04W80/04 ,  H04L12/56 ,  H04Q7/38

Abstract: A tunneling optimization is described in which packets are forwarded from a home agent to a mobile device by co-locating a foreign agent corresponding to a mobile device at the mobile device. When a mobile device acquires a new foreign agent, the mobile device notifies the home agent as to the corresponding foreign agent address. A packet received at the home agent having the mobile device as a packet header destination address is parsed and the foreign agent address is substituted for the mobile device address, and the packet is forwarded to the foreign agent. The foreign agent, upon receiving the packet, removes the foreign agent address and replaces the mobile device address as the packet header destination address. The packet is then forwarded to the mobile device.

公开(公告)号：DE602005004477D1

公开(公告)日：2008-03-13

申请号：DE602005004477

申请日：2005-10-25

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LAKSHMAN TIRUNELL V ,  NANDAGOPAL THYAGARAJAN ,  RAMJEE RAMACHANDRAN ,  WOO THOMAS Y ,  SABNANI KRISHAN K

IPC: H04L45/60

Abstract: The SoftRouter architecture separates the implementation of control plane functions from packet forwarding functions. In this architecture, all control plane functions are implemented on general purpose servers called the control elements (CEs) 200, 204 that may be multiple hops away from the forwarding elements (FEs) 202, 206. A network element (NE) or a router is formed using dynamic binding between the CEs and the FEs. The flexibility of the SoftRouter architecture over conventional routers with collocated and tightly integrated control and forwarding functions results in increased reliability, increased scalability, increased security, ease of adding new functionality, and decreased cost.

公开(公告)号：DE60125266D1

公开(公告)日：2007-02-01

申请号：DE60125266

申请日：2001-03-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： LA PORTA THOMAS F ,  RAMJEE RAMACHANDRAN ,  SALGARELLI LUCA ,  THUEL SANDRA R ,  VARADHAN KANNAN

IPC: H04L29/06 ,  H04L29/12

Abstract: Portable and/or mobile IP hosts desiring to connect to the Internet can dynamically acquire a home address and other configuration information through DHCP when powering up in a foreign network. A two-stage configuration procedure is used. First, the mobile host uses the M-IP protocol to establish contact with an addressing element, referred to as a bootstrapping agent, that is usually co-located with a M-IP Home Agent, and that allocates a temporary home address for the mobile host. The temporary address is used to create a temporary tunnel. Second, this temporary tunnel is used as the communication vehicle over which standard DHCP transactions take place. The present invention is thus arranged to use a) M-IP as the signaling mechanism for reaching the home network and dynamically allocating a temporary home address for the mobile host; and b) DHCP to allocate a permanent home address and any other configuration state for the mobile host.

公开(公告)号：DE69928357D1

公开(公告)日：2005-12-22

申请号：DE69928357

申请日：1999-07-26

Applicant: LUCENT TECHNOLOGIES INC

Inventor： AHO ALFRED VAINO ,  GITLIN RICHARD DENNIS ,  RAMJEE RAMACHANDRAN ,  WOO THOMAS YAT CHUNG

IPC: H04L29/06 ,  H04B7/26 ,  H04L12/28 ,  H04L29/08 ,  H04W36/14 ,  H04W76/04 ,  H04W88/06

Abstract: In a method of effectuating a change in the operation of a portable communication device such as a laptop or palmtop computer, a personal digital assistant (PDA), or a cellular telephone the device can communicate with a remote host or server using one of two or more different communication arrangements. Various signals indicative of the environment in which the device is operating are monitored, to anticipate or predict a change or transition from one communication arrangement to the other. If the change is determined to be both imminent and significant, the operation change is effected substantially simultaneously, by changing parameters in the transport and/or application protocol layer in the device.

公开(公告)号：CA2287786A1

公开(公告)日：2000-06-11

申请号：CA2287786

申请日：1999-10-29

Applicant: LUCENT TECHNOLOGIES INC

Inventor： VARADHAN KANNAN ,  RAMJEE RAMACHANDRAN ,  MURAKAMI KAZUTAKA ,  LA PORTA THOMAS F ,  THUEL SANDRA R

IPC: H04B7/26 ,  H04L12/56 ,  H04L29/06 ,  H04L29/12 ,  H04W40/24 ,  H04W40/28 ,  H04W40/36 ,  H04W80/04 ,  H04W88/00 ,  H04Q7/38 ,  H04L12/12

Abstract: Domains are defined to incorporate a subnet including a plurality of base stations and routers. Base stations are used by mobile devices to attach to the wired portion of a packet-based network, such as the Internet, and exchange packets thereover with a correspondent node. Local mobility between domain base stations is provided by including and updating routing table entries at domain routers and base stations for forwarding packets having a mobile device's address as a destination address to the mobile device. Packets are delivered to the mobile device regardless of the domain base station to which the mobile device is attached. When a mobile device is attached to a base station included within a foreign domain, a care-of address is assigned, and packets are tunneled for delivery of packets to the mobile device. Only one care-of address is required per mobile device per foreign domain. Routing table entries used for packet delivery are updated on a purely local subnet basis within domains, whether home domain or foreign domain, making handoffs between base stations substantially transparent to the home agent and the correspondent node.

公开(公告)号：CA2252018A1

公开(公告)日：1999-06-05

申请号：CA2252018

申请日：1998-10-28

Applicant: LUCENT TECHNOLOGIES INC

Inventor： MURAKAMI KAZUTAKA ,  BUSKENS RICHARD WAYNE ,  RAMJEE RAMACHANDRAN ,  LIN YOW-JIAN ,  LA PORTA THOMAS F ,  DEITZ MICHAEL P

IPC: H04W88/16 ,  H04W92/14 ,  H04Q7/30 ,  H04Q7/24

Abstract: A "cluster mobile switching center" (cMSC) is arranged to perform the switching and control functions of a conventional mobile switching center (MSC), including, if desired, the additional functions of a conventional visitor location register (VLR). The cMSC is implemented on distributed processors using modular software. Advantageously, a specific instance of middleware, known as Common Object Request Broker Architecture (CORBA), is used as the communications middleware. Functionally, the cMSC is arranged to have two classes of servers: (1) Interworking managers (IMs) that act as gateways and provide interfaces to external network elements, and (2) core servers that perform call processing (registration, location updates, incoming and outgoing call processing) functions and communicate with each other using CORBA. IMs terminate standard protocols with the external elements and use CORBA to communicate with the core servers. Software objects are defined to perform specific tasks, manage particular resources, and interact to provide end-to-end services.