US 2002/0154613 A1 · Method and system for a low-overhead mobility management protocol in the internet protocol layer

Abstract

A network system of Mobile Nodes (MNs) and Access Routers (ARs) for supporting mobile Internet communication is provided. Each AR has a unique IP address and access range in which the ARs communicates data to the MNs. Each MN is associated with a home AR and is identified with an IP address of a current location in a Node Location Table (NLT) associated with the home AR. A Corresponding Node (CN) and a Mobile Node (MN) communicate over the Internet using standard format datagrams. The CN sends a first datagram with a query as to the location of the MN in the data portion of the first datagram. The home AR replies with a second datagram with a query reply containing the current IP address of the MN in the data portion of the second datagram. The CN sends at least a third datagram having a data message protocol as the header protocol type and includes an identification of the MN and communication data for the MN in the data portion of the third datagram. The MN receives the communication data contained in the third datagram via the AR with which the MN is in communication. The method preferably includes the MN sending a datagram, when the MN communicates via an AR which is not its home AR, which includes an identification of the current IP address in its data portion. The home AR receives the MN datagram and uses the data portion thereof to update its NLT.

Claims6

Dependent claims

A network system for supporting mobile Internet communication comprising:

a plurality of Mobile Nodes (MNs);
a plurality of Access Routers (ARs), each having unique Internet Protocol (IP) address and a geographic access range in which the ARs communicates data to the MNs;
each MN associated with a home AR;
each AR having an associated Node Location Table (NLT) identifying each MN for which the AR is the home AR and the IP address of a current location of each such MN;
and
each MN being movable outside the access range of its home AR to a location within the access range of a selected one of any of the other ARs to receive data via the selected AR by communicating to its home AR the IP address of the selected AR as its current location whereby a data communication from a corresponding node (CN) to a selected MN is communicated to the selected MN by directing a query to the IP address of the selected MN's home AR, receiving the IP address of the current location of the selected MN from the NLT of the selected MN's home AR and directing the data communication to the received IP address.

3 more elements

A method of communication between a Corresponding Node (CN) and a Mobile Node (MN) over the Internet using datagrams having a header portion and a data portion where the header portion includes a source Internet Protocol (IP) address, a destination IP address and a protocol type wherein the CN communicates with the Internet via a router having a first IP address, the MN is associated with a home Access Router (AR) having a second IP address and the MN is in communication with the Internet via an AR having a third IP address, the method comprising:

the CN sending a first datagram identifying the first IP address as the header source IP address, the second IP address as the header destination address, an Internet Control Message Protocol (ICMP) as the header protocol type, and a query as to the location of the MN is included in the data portion of said first datagram;
the home AR receiving the first datagram from the CN and replying with a second datagram wherein the second IP address is the header source IP address, the first IP address is the header destination IP address, an ICMP is the header protocol type, and a query reply containing the third IP address is included in the data portion of the second datagram;
the CN receiving the second datagram and sending at least a third datagram having the first IP address as the header source IP address, the third IP address as the header destination IP address, a data message protocol as the header protocol type and includes an identification of the MN and communication data for the MN in the data portion of said third datagram;
and
the MN receiving the communication data contained in said third datagram via the AR with which the MN is in communication.

2 more elements

Dependencies are inferred from the claim text.

Method and system for a low-overhead mobility management protocol in the internet protocol layer

Life of this patent

Method and system for a low-overhead mobility management protocol in the internet protocol layer

Life of this patent

Abstract

Claims6