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| It is an object of the present invention to provide spectrum spread system transmission method and ... |
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| Battery-feed circuit for exchange |
| Accordingly, it is an object of the present invention to provide an improved battery-feed circuit, ... |
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| Apparatus and method for mapping E1 signals into a digital cross-connect matrix space |
| Accordingly, there is a need for apparatus and a method for mapping E1 signals into a digital cross-... |
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| Device for demodulating signals modulated by frequency-shift keying |
| What is claimed is: 1. A device for demodulating signals modulated by frequency shift, said signals ... |
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| Interface device for converting a computer printer port into an input/output port |
| The present invention is an interface device in which the printer port of a PC can be used as an ... |
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| Digital direct sequence spread spectrum receiver |
| OF ILLUSTRATED EMBODIMENTS FIG. 1 shows a block diagram of a direct sequence spread spectrum ... |
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| CDMA mobile communication system and method with improved phase correction features |
| It is an object of the present invention to provide a mobile station of a CDMA mobile communication ... |
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| Method for determining hand-off candidates in a neighbor set in a CDMA communication system |
| OF THE PREFERRED EMBODIMENT(S) A communication system provides wireless communication in a ... |
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| Delay line time compression correlation circuit |
| OF THE DISCLOSURE FIG. 1 is a schematic representation of a control counter 10 which provides the S... |
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| Equalizer and equalizing circuit using the same |
| Therefore, an object of the present invention is to provide an equalizing circuit which can be ... |
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Two phase local mobility scheme for wireless access to packet based networks
| Details |
Inventors: La Porta, Thomas F.; Murakami, Kazutaka; Ramjee, Ramachandran; Thuel, Sandra R.; Varadhan, Kannan;
Assignee: Lucent Technologies Inc. (Murray Hill, NJ)
Primary Examiner: Sam; Phirin
Assistant Examiner:
Attorney, Agent or Firm: Hodulik; Matthew J.
Local mobility within a subnet is supported by classifying wireless base stations, and the routers used to forward packets to those base stations, within defined domains. Domains are defined to incorporate a subnet having a plurality of base stations. 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. Packets sent from the correspondent node to the mobile device have a packet destination address corresponding to the mobile device. The mobile device retains this address for the duration of time it is powered up and attached to the Internet via any base station within a given domain. Host-based routing is utilized to update routing table entries corresponding to the mobile device at routers incorporated within a single domain. The routing table entries are established and updated via path setup schemes to convey packets destined for the mobile device along the proper established path through the domain routers and base stations, regardless of the domain base station through which the mobile device is attached. Path setup schemes utilize power up, refresh, and handoff path setup messages to maintain the proper relationship between router interfaces and packet addresses for routing table entries. |
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DETAILED DESCRIPTION Local mobility within a subnet is supported by classifying wireless base stations, and the routers used to forward packets to those base stations, within defined domains.
Domains are typically defined to incorporate a subnet having a plurality of base stations.
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.
Packets sent from the correspondent node to the mobile device have a packet destination address corresponding to the mobile device.
The mobile device retains this address for the duration of time it is powered up and attached to the Internet via any base station within a given domain.
Host-based routing is utilized to update routing table entries corresponding to the mobile device at routers (including routing capable base stations) incorporated within a single domain.
Routing table entries are established and updated via path setup schemes which convey packets destined for the mobile device along the proper established path through the domain routers and base stations, regardless of the domain base station through which the mobile device is attached.
Path setup schemes utilize power up, refresh, and handoff path setup messages to maintain the proper relationship between router interfaces and packet addresses for routing table entries.
We have observed that mobility is typically a localized phenomenon; that is, the majority of handoffs from one base station to another occur when both the new and old base stations are incorporated within the same subnet.
Therefore, for the majority of mobile device handoffs, local routing table entries in selected routers within the domain are updated, but the mobile device address and/or care-of address utilized remain the same.
As a result of this observation and the application of the present invention as a mobility solution, handoff notifications to nodes outside of the local domain or subnet, such as to the home agent and the correspondent node, are substantially minimized, making the majority of mobile device handoffs between base stations transparent to the home agent and the correspondent node
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Multiplexer-related 
