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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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| 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 |
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| Loran-C signal processor |
| FIG. 1 shows the detailed block diagram of my novel signal processor 10. The signal waveform input ... |
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| CDMA communications method and system |
| It is therefore an object of the present invention to provide a CDMA communications method and ... |
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Simple multicast extension for mobile IP SMM
| Details |
Inventors: Magret, Vincent; Rose, Laurence;
Assignee: Alcatel (Paris, FR)
Primary Examiner: Dharia; Rupal
Assistant Examiner: Bayard; Djenane
Attorney, Agent or Firm: Sughrue Mion, PLLC, Smith; Jessica W., Slaton; Bobby D.
Under Simple Multicast Extension for Mobile IP, when a mobile node arrives at a foreign wireless domain, it listens for an agent advertisement sent by a foreign agent. The foreign agent attaches a network access identifier (NAI) extension to the agent advertisement. The mobile node uses the NAI extension to decide which action to take. If the mobile node determines that it is receiving an agent advertisement message from the same foreign agent it previously was in communication with, no action is required. If the mobile node discovers that it has entered a new foreign domain, it sends a registration request to the foreign agent. If the mobile node identifies that it is still in the same domain but has moved from a previous foreign agent to a new one, it sends a multicast subscription request to the new foreign agent. If a home agent supports the Simple Multicast Extension for Mobile IP, it allocates a source specific multicast address and inserts the address in a source specific multicast address extension after the registration reply. In addition, tunneling is used to route datagrams from correspondent nodes to the mobile node while the mobile node is in a foreign domain. The destination address of the tunnel is set to the source specific multicast previously allocated. Finally, update messages are used to inform correspondent nodes of a mobile nodes' new location. |
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DETAILED DESCRIPTION In a preferred embodiment, the invention is a method and apparatus for routing data to a mobile node in both home and in foreign domains using the following methodology.
A foreign agent sends an advertisement message to a mobile, which contains an indicator about the foreign agent's capability to support the proposed invention.
The mobile node sends a request to the foreign agent.
The request is a registration request if the mobile has entered a new foreign domain.
The foreign agent relays the registration request to a home agent.
The home agent inserts a multicast address in a source specific multicast address extension and appends the extension to a registration reply.
The mobile node receives the registration reply along with the attached source specific multicast address extension.
In another preferred embodiment, the request is a multicast subscription request if the mobile has remained in the same foreign domain, but has moved to a new foreign agent.
In addition, the mobile node also sends a MN-FA authentication to the foreign agent.
In still another preferred embodiment, the invention is a method and apparatus for updating location in a communication system using the following methodology.
A home agent sends a binding update to a correspondent, informing the correspondent of the mobile node's multicast address.
The correspondent sends an acknowledgement back to the home agent.
The home agent then sends a source update to the mobile node, informing the mobile that said correspondent has received the binding update with the multicast address.
In still another preferred embodiment, the invention is a method and apparatus for tunneling data in a communication system using the following methodology.
A home agent intercepts packets sent to a mobile node from a correspondent node when said mobile node is visiting a foreign wireless domain and tunnels the packets using a multicast address.
A foreign agent forwarding said packets to said mobile node and the mobile node detunnels the intercepted packets
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Multiplexer-related 
