Merged packet service and mobile internet protocol

• US 6,711,147 B1
• Filed: 06/15/1999
• Issued: 03/23/2004
• Est. Priority Date: 04/01/1999
• Status: Expired due to Fees

• Current Assignee: RPX Clearinghouse LLC (RPX Corporation)
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Akhtar, Haseeb, Qaddoura, Emad A., Hosain, Akram, Barnes, Mary H.
• Primary Examiner(s): Gelin, Jean Alland
• Application Number:
  US09/333,841
• Time in Patent Office: 1,743 Days
• Field of Search: 370/328, 370/329, 370/338, 370/352, 370/353, 370/401, 370/465, 370/466, 370/354-356, 370/331, 370/332, 370/395.5, 370/395.51, 370/395.52, 370/408, 370/409, 709/200, 709/201, 709/202, 709/213, 709/245, 709/246, 709/249
• US Class Current: 370/338
• CPC Class Codes: H04L 12/6418 Hybrid transport

Abstract

A network, system and method for merging a packet service such as GPRS with a mobile IP is disclosed. The GPRS network includes a first base station for providing wireless access to a mobile node, a GPRS support node (GSN) connected to the base station, and a security gateway for connecting the GPRS network to a second network that may use mobile IP. The GSN is capable of creating an IP tunnel connecting it to the second network through the security gateway. The GSN is also capable of handling mobile IP specific messaging and converting the wireless access to mobile IP specific messaging.

Claims

1. A packet data network comprising:

a first base station for providing wireless access to a mobile node;

a support node connected to the base station;

a memory accessible to the support node; and

a security gateway;

wherein the support node is capable of creating an internet protocol (IP) tunnel connecting it to a mobile IP network capable of handling mobile IP specific messaging and also converts the wireless access messaging to mobile IP specific messaging; and

wherein the memory is operable to hold data that is transferable through the IP tunnel for a predetermined period of time.

2. The network of claim 1 further comprising:

a second base station for providing wireless access to the mobile node;

wherein the support node handles the mobility of the mobile node from the first base station to the second base station.

3. The network of claim 1 further comprising:

a register connected without mobile IP specific messaging;

wherein the support node is also capable of communicating with the register.

4. The network of claim 1 wherein, if the mobile node roams to the mobile IP network, the support node is also capable of handing off its connection to an agent of the mobile IP network.

5. The network of claim 1 wherein the support node is a GPRS support node and includes mobile IP agent functionality.

6. The network of claim 5 wherein the GPRS support node acts as a home agent for the mobile node and is capable of establishing a care-of address for the mobile node if the mobile node roams into the mobile IP network.

7. The network of claim 5 wherein the GPRS support node provides a home address for the mobile node.

8. The network of claim 5 wherein the GPRS support node sends packets to and from the mobile node using conventional IP routing mechanisms.

9. A method for use in a wireless communications network capable of supplying packet data transfers, the method comprising:

establishing a first connection with a mobile node;

establishing a second connection between the first connection and an internet protocol (IP) network via an IP tunnel;

providing an address for the mobile node;

converting a protocol compatible with the mobile node connection to a protocol compatible with the IP network connection;

converting the IP compatible protocol to the mobile node compatible protocol;

holding data that is transferable through the IP tunnel for a predetermined period of time;

maintaining a location of the mobile node;

updating a home location register of the location; and

if the mobile node leaves a first routing area, ending the connection with the mobile node.

10. The method of claim 9 further comprising:

if the mobile node leaves a first routing area, establishing a care-of address for the mobile node.

11. The method of claim 9 wherein the first routing area is part of a home network for the mobile node, the method further comprising:

providing a home address for the mobile node.

12. The method of claim 9 wherein the first routing area is not part of a home network for the mobile node, the method further comprising:

maintaining a visitor list with an internet protocol address for the mobile node.

13. The method of claim 9 wherein converting the protocol between the mobile node and IP network includes modifying a header for packet data transfers.

14. The method of claim 9 wherein each of the protocols is a predetermined protocol for data transfer.

15. A method for updating a register in a cellular telephone network of activities by a mobile node in a mobile internet protocol network, the method comprising:

receiving a first mobile internet protocol registration request by an agent of the mobile internet protocol network serving the mobile node;

sending a second mobile internet protocol registration request to a serving node in the cellular telephone network, requesting that the serving node serve as a proxy;

sending a location message to the register from the proxy;

after the location message has been received by the register, sending a first registration reply to the serving node; and

after the first registration reply has been received by the serving node, sending a second registration reply to the agent.

16. The method of claim 15 wherein the serving node is a GPRS serving node and the register is a home location register.

17. The method of claim 16 wherein the second mobile internet protocol registration uses a mobile application protocol interface to the home location register.

18. A GPRS service node in a cellular telephone network capable of facilitating a mobile node in a mobile internet protocol network, the GPRS service node comprising:

means for receiving an update request by an agent of the mobile internet protocol network serving the mobile node;

means for recognizing that the update request also requests that the GPRS serving node act as a proxy, wherein the request for the proxy is denoted by an indicator in the update request; and

means for forwarding the update message to a register associated with the cellular telephone network.

19. The GPRS service node of claim 18 further comprising:

means for receiving an acknowledgment from the register indicating receipt of the update message;

means for forwarding the acknowledgment to the agent.

20. The GPRS service node of claim 18 wherein the register is a home location register.

21. The GPRS service node of claim 18 wherein means for forwarding the update message to a register uses a mobile application protocol interface to the home location register and the means for forwarding the acknowledgment to the agent uses an internet protocol.